| /* |
| * USB hub driver. |
| * |
| * (C) Copyright 1999 Linus Torvalds |
| * (C) Copyright 1999 Johannes Erdfelt |
| * (C) Copyright 1999 Gregory P. Smith |
| * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/completion.h> |
| #include <linux/sched.h> |
| #include <linux/list.h> |
| #include <linux/slab.h> |
| #include <linux/ioctl.h> |
| #include <linux/usb.h> |
| #include <linux/usbdevice_fs.h> |
| #include <linux/usb/hcd.h> |
| #include <linux/usb/otg.h> |
| #include <linux/usb/quirks.h> |
| #include <linux/kthread.h> |
| #include <linux/mutex.h> |
| #include <linux/freezer.h> |
| #include <linux/random.h> |
| #include <linux/pm_qos.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/byteorder.h> |
| |
| #include "hub.h" |
| |
| #define USB_VENDOR_GENESYS_LOGIC 0x05e3 |
| #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 |
| |
| /* Protect struct usb_device->state and ->children members |
| * Note: Both are also protected by ->dev.sem, except that ->state can |
| * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
| static DEFINE_SPINLOCK(device_state_lock); |
| |
| /* khubd's worklist and its lock */ |
| static DEFINE_SPINLOCK(hub_event_lock); |
| static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ |
| |
| /* Wakes up khubd */ |
| static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); |
| |
| static struct task_struct *khubd_task; |
| |
| /* synchronize hub-port add/remove and peering operations */ |
| DEFINE_MUTEX(usb_port_peer_mutex); |
| |
| /* cycle leds on hubs that aren't blinking for attention */ |
| static bool blinkenlights = 0; |
| module_param (blinkenlights, bool, S_IRUGO); |
| MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); |
| |
| /* |
| * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about |
| * 10 seconds to send reply for the initial 64-byte descriptor request. |
| */ |
| /* define initial 64-byte descriptor request timeout in milliseconds */ |
| static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; |
| module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); |
| MODULE_PARM_DESC(initial_descriptor_timeout, |
| "initial 64-byte descriptor request timeout in milliseconds " |
| "(default 5000 - 5.0 seconds)"); |
| |
| /* |
| * As of 2.6.10 we introduce a new USB device initialization scheme which |
| * closely resembles the way Windows works. Hopefully it will be compatible |
| * with a wider range of devices than the old scheme. However some previously |
| * working devices may start giving rise to "device not accepting address" |
| * errors; if that happens the user can try the old scheme by adjusting the |
| * following module parameters. |
| * |
| * For maximum flexibility there are two boolean parameters to control the |
| * hub driver's behavior. On the first initialization attempt, if the |
| * "old_scheme_first" parameter is set then the old scheme will be used, |
| * otherwise the new scheme is used. If that fails and "use_both_schemes" |
| * is set, then the driver will make another attempt, using the other scheme. |
| */ |
| static bool old_scheme_first = 0; |
| module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(old_scheme_first, |
| "start with the old device initialization scheme"); |
| |
| static bool use_both_schemes = 1; |
| module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(use_both_schemes, |
| "try the other device initialization scheme if the " |
| "first one fails"); |
| |
| /* Mutual exclusion for EHCI CF initialization. This interferes with |
| * port reset on some companion controllers. |
| */ |
| DECLARE_RWSEM(ehci_cf_port_reset_rwsem); |
| EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); |
| |
| #define HUB_DEBOUNCE_TIMEOUT 2000 |
| #define HUB_DEBOUNCE_STEP 25 |
| #define HUB_DEBOUNCE_STABLE 100 |
| |
| static int usb_reset_and_verify_device(struct usb_device *udev); |
| |
| static inline char *portspeed(struct usb_hub *hub, int portstatus) |
| { |
| if (hub_is_superspeed(hub->hdev)) |
| return "5.0 Gb/s"; |
| if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
| return "480 Mb/s"; |
| else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
| return "1.5 Mb/s"; |
| else |
| return "12 Mb/s"; |
| } |
| |
| /* Note that hdev or one of its children must be locked! */ |
| struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) |
| { |
| if (!hdev || !hdev->actconfig || !hdev->maxchild) |
| return NULL; |
| return usb_get_intfdata(hdev->actconfig->interface[0]); |
| } |
| |
| static int usb_device_supports_lpm(struct usb_device *udev) |
| { |
| /* USB 2.1 (and greater) devices indicate LPM support through |
| * their USB 2.0 Extended Capabilities BOS descriptor. |
| */ |
| if (udev->speed == USB_SPEED_HIGH) { |
| if (udev->bos->ext_cap && |
| (USB_LPM_SUPPORT & |
| le32_to_cpu(udev->bos->ext_cap->bmAttributes))) |
| return 1; |
| return 0; |
| } |
| |
| /* |
| * According to the USB 3.0 spec, all USB 3.0 devices must support LPM. |
| * However, there are some that don't, and they set the U1/U2 exit |
| * latencies to zero. |
| */ |
| if (!udev->bos->ss_cap) { |
| dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); |
| return 0; |
| } |
| |
| if (udev->bos->ss_cap->bU1devExitLat == 0 && |
| udev->bos->ss_cap->bU2DevExitLat == 0) { |
| if (udev->parent) |
| dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); |
| else |
| dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); |
| return 0; |
| } |
| |
| if (!udev->parent || udev->parent->lpm_capable) |
| return 1; |
| return 0; |
| } |
| |
| /* |
| * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from |
| * either U1 or U2. |
| */ |
| static void usb_set_lpm_mel(struct usb_device *udev, |
| struct usb3_lpm_parameters *udev_lpm_params, |
| unsigned int udev_exit_latency, |
| struct usb_hub *hub, |
| struct usb3_lpm_parameters *hub_lpm_params, |
| unsigned int hub_exit_latency) |
| { |
| unsigned int total_mel; |
| unsigned int device_mel; |
| unsigned int hub_mel; |
| |
| /* |
| * Calculate the time it takes to transition all links from the roothub |
| * to the parent hub into U0. The parent hub must then decode the |
| * packet (hub header decode latency) to figure out which port it was |
| * bound for. |
| * |
| * The Hub Header decode latency is expressed in 0.1us intervals (0x1 |
| * means 0.1us). Multiply that by 100 to get nanoseconds. |
| */ |
| total_mel = hub_lpm_params->mel + |
| (hub->descriptor->u.ss.bHubHdrDecLat * 100); |
| |
| /* |
| * How long will it take to transition the downstream hub's port into |
| * U0? The greater of either the hub exit latency or the device exit |
| * latency. |
| * |
| * The BOS U1/U2 exit latencies are expressed in 1us intervals. |
| * Multiply that by 1000 to get nanoseconds. |
| */ |
| device_mel = udev_exit_latency * 1000; |
| hub_mel = hub_exit_latency * 1000; |
| if (device_mel > hub_mel) |
| total_mel += device_mel; |
| else |
| total_mel += hub_mel; |
| |
| udev_lpm_params->mel = total_mel; |
| } |
| |
| /* |
| * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate |
| * a transition from either U1 or U2. |
| */ |
| static void usb_set_lpm_pel(struct usb_device *udev, |
| struct usb3_lpm_parameters *udev_lpm_params, |
| unsigned int udev_exit_latency, |
| struct usb_hub *hub, |
| struct usb3_lpm_parameters *hub_lpm_params, |
| unsigned int hub_exit_latency, |
| unsigned int port_to_port_exit_latency) |
| { |
| unsigned int first_link_pel; |
| unsigned int hub_pel; |
| |
| /* |
| * First, the device sends an LFPS to transition the link between the |
| * device and the parent hub into U0. The exit latency is the bigger of |
| * the device exit latency or the hub exit latency. |
| */ |
| if (udev_exit_latency > hub_exit_latency) |
| first_link_pel = udev_exit_latency * 1000; |
| else |
| first_link_pel = hub_exit_latency * 1000; |
| |
| /* |
| * When the hub starts to receive the LFPS, there is a slight delay for |
| * it to figure out that one of the ports is sending an LFPS. Then it |
| * will forward the LFPS to its upstream link. The exit latency is the |
| * delay, plus the PEL that we calculated for this hub. |
| */ |
| hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; |
| |
| /* |
| * According to figure C-7 in the USB 3.0 spec, the PEL for this device |
| * is the greater of the two exit latencies. |
| */ |
| if (first_link_pel > hub_pel) |
| udev_lpm_params->pel = first_link_pel; |
| else |
| udev_lpm_params->pel = hub_pel; |
| } |
| |
| /* |
| * Set the System Exit Latency (SEL) to indicate the total worst-case time from |
| * when a device initiates a transition to U0, until when it will receive the |
| * first packet from the host controller. |
| * |
| * Section C.1.5.1 describes the four components to this: |
| * - t1: device PEL |
| * - t2: time for the ERDY to make it from the device to the host. |
| * - t3: a host-specific delay to process the ERDY. |
| * - t4: time for the packet to make it from the host to the device. |
| * |
| * t3 is specific to both the xHCI host and the platform the host is integrated |
| * into. The Intel HW folks have said it's negligible, FIXME if a different |
| * vendor says otherwise. |
| */ |
| static void usb_set_lpm_sel(struct usb_device *udev, |
| struct usb3_lpm_parameters *udev_lpm_params) |
| { |
| struct usb_device *parent; |
| unsigned int num_hubs; |
| unsigned int total_sel; |
| |
| /* t1 = device PEL */ |
| total_sel = udev_lpm_params->pel; |
| /* How many external hubs are in between the device & the root port. */ |
| for (parent = udev->parent, num_hubs = 0; parent->parent; |
| parent = parent->parent) |
| num_hubs++; |
| /* t2 = 2.1us + 250ns * (num_hubs - 1) */ |
| if (num_hubs > 0) |
| total_sel += 2100 + 250 * (num_hubs - 1); |
| |
| /* t4 = 250ns * num_hubs */ |
| total_sel += 250 * num_hubs; |
| |
| udev_lpm_params->sel = total_sel; |
| } |
| |
| static void usb_set_lpm_parameters(struct usb_device *udev) |
| { |
| struct usb_hub *hub; |
| unsigned int port_to_port_delay; |
| unsigned int udev_u1_del; |
| unsigned int udev_u2_del; |
| unsigned int hub_u1_del; |
| unsigned int hub_u2_del; |
| |
| if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER) |
| return; |
| |
| hub = usb_hub_to_struct_hub(udev->parent); |
| /* It doesn't take time to transition the roothub into U0, since it |
| * doesn't have an upstream link. |
| */ |
| if (!hub) |
| return; |
| |
| udev_u1_del = udev->bos->ss_cap->bU1devExitLat; |
| udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); |
| hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; |
| hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); |
| |
| usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, |
| hub, &udev->parent->u1_params, hub_u1_del); |
| |
| usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, |
| hub, &udev->parent->u2_params, hub_u2_del); |
| |
| /* |
| * Appendix C, section C.2.2.2, says that there is a slight delay from |
| * when the parent hub notices the downstream port is trying to |
| * transition to U0 to when the hub initiates a U0 transition on its |
| * upstream port. The section says the delays are tPort2PortU1EL and |
| * tPort2PortU2EL, but it doesn't define what they are. |
| * |
| * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking |
| * about the same delays. Use the maximum delay calculations from those |
| * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For |
| * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I |
| * assume the device exit latencies they are talking about are the hub |
| * exit latencies. |
| * |
| * What do we do if the U2 exit latency is less than the U1 exit |
| * latency? It's possible, although not likely... |
| */ |
| port_to_port_delay = 1; |
| |
| usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, |
| hub, &udev->parent->u1_params, hub_u1_del, |
| port_to_port_delay); |
| |
| if (hub_u2_del > hub_u1_del) |
| port_to_port_delay = 1 + hub_u2_del - hub_u1_del; |
| else |
| port_to_port_delay = 1 + hub_u1_del; |
| |
| usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, |
| hub, &udev->parent->u2_params, hub_u2_del, |
| port_to_port_delay); |
| |
| /* Now that we've got PEL, calculate SEL. */ |
| usb_set_lpm_sel(udev, &udev->u1_params); |
| usb_set_lpm_sel(udev, &udev->u2_params); |
| } |
| |
| /* USB 2.0 spec Section 11.24.4.5 */ |
| static int get_hub_descriptor(struct usb_device *hdev, void *data) |
| { |
| int i, ret, size; |
| unsigned dtype; |
| |
| if (hub_is_superspeed(hdev)) { |
| dtype = USB_DT_SS_HUB; |
| size = USB_DT_SS_HUB_SIZE; |
| } else { |
| dtype = USB_DT_HUB; |
| size = sizeof(struct usb_hub_descriptor); |
| } |
| |
| for (i = 0; i < 3; i++) { |
| ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, |
| dtype << 8, 0, data, size, |
| USB_CTRL_GET_TIMEOUT); |
| if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) |
| return ret; |
| } |
| return -EINVAL; |
| } |
| |
| /* |
| * USB 2.0 spec Section 11.24.2.1 |
| */ |
| static int clear_hub_feature(struct usb_device *hdev, int feature) |
| { |
| return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); |
| } |
| |
| /* |
| * USB 2.0 spec Section 11.24.2.2 |
| */ |
| int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) |
| { |
| return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, |
| NULL, 0, 1000); |
| } |
| |
| /* |
| * USB 2.0 spec Section 11.24.2.13 |
| */ |
| static int set_port_feature(struct usb_device *hdev, int port1, int feature) |
| { |
| return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, |
| NULL, 0, 1000); |
| } |
| |
| static char *to_led_name(int selector) |
| { |
| switch (selector) { |
| case HUB_LED_AMBER: |
| return "amber"; |
| case HUB_LED_GREEN: |
| return "green"; |
| case HUB_LED_OFF: |
| return "off"; |
| case HUB_LED_AUTO: |
| return "auto"; |
| default: |
| return "??"; |
| } |
| } |
| |
| /* |
| * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 |
| * for info about using port indicators |
| */ |
| static void set_port_led(struct usb_hub *hub, int port1, int selector) |
| { |
| struct usb_port *port_dev = hub->ports[port1 - 1]; |
| int status; |
| |
| status = set_port_feature(hub->hdev, (selector << 8) | port1, |
| USB_PORT_FEAT_INDICATOR); |
| dev_dbg(&port_dev->dev, "indicator %s status %d\n", |
| to_led_name(selector), status); |
| } |
| |
| #define LED_CYCLE_PERIOD ((2*HZ)/3) |
| |
| static void led_work (struct work_struct *work) |
| { |
| struct usb_hub *hub = |
| container_of(work, struct usb_hub, leds.work); |
| struct usb_device *hdev = hub->hdev; |
| unsigned i; |
| unsigned changed = 0; |
| int cursor = -1; |
| |
| if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) |
| return; |
| |
| for (i = 0; i < hdev->maxchild; i++) { |
| unsigned selector, mode; |
| |
| /* 30%-50% duty cycle */ |
| |
| switch (hub->indicator[i]) { |
| /* cycle marker */ |
| case INDICATOR_CYCLE: |
| cursor = i; |
| selector = HUB_LED_AUTO; |
| mode = INDICATOR_AUTO; |
| break; |
| /* blinking green = sw attention */ |
| case INDICATOR_GREEN_BLINK: |
| selector = HUB_LED_GREEN; |
| mode = INDICATOR_GREEN_BLINK_OFF; |
| break; |
| case INDICATOR_GREEN_BLINK_OFF: |
| selector = HUB_LED_OFF; |
| mode = INDICATOR_GREEN_BLINK; |
| break; |
| /* blinking amber = hw attention */ |
| case INDICATOR_AMBER_BLINK: |
| selector = HUB_LED_AMBER; |
| mode = INDICATOR_AMBER_BLINK_OFF; |
| break; |
| case INDICATOR_AMBER_BLINK_OFF: |
| selector = HUB_LED_OFF; |
| mode = INDICATOR_AMBER_BLINK; |
| break; |
| /* blink green/amber = reserved */ |
| case INDICATOR_ALT_BLINK: |
| selector = HUB_LED_GREEN; |
| mode = INDICATOR_ALT_BLINK_OFF; |
| break; |
| case INDICATOR_ALT_BLINK_OFF: |
| selector = HUB_LED_AMBER; |
| mode = INDICATOR_ALT_BLINK; |
| break; |
| default: |
| continue; |
| } |
| if (selector != HUB_LED_AUTO) |
| changed = 1; |
| set_port_led(hub, i + 1, selector); |
| hub->indicator[i] = mode; |
| } |
| if (!changed && blinkenlights) { |
| cursor++; |
| cursor %= hdev->maxchild; |
| set_port_led(hub, cursor + 1, HUB_LED_GREEN); |
| hub->indicator[cursor] = INDICATOR_CYCLE; |
| changed++; |
| } |
| if (changed) |
| queue_delayed_work(system_power_efficient_wq, |
| &hub->leds, LED_CYCLE_PERIOD); |
| } |
| |
| /* use a short timeout for hub/port status fetches */ |
| #define USB_STS_TIMEOUT 1000 |
| #define USB_STS_RETRIES 5 |
| |
| /* |
| * USB 2.0 spec Section 11.24.2.6 |
| */ |
| static int get_hub_status(struct usb_device *hdev, |
| struct usb_hub_status *data) |
| { |
| int i, status = -ETIMEDOUT; |
| |
| for (i = 0; i < USB_STS_RETRIES && |
| (status == -ETIMEDOUT || status == -EPIPE); i++) { |
| status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, |
| data, sizeof(*data), USB_STS_TIMEOUT); |
| } |
| return status; |
| } |
| |
| /* |
| * USB 2.0 spec Section 11.24.2.7 |
| */ |
| static int get_port_status(struct usb_device *hdev, int port1, |
| struct usb_port_status *data) |
| { |
| int i, status = -ETIMEDOUT; |
| |
| for (i = 0; i < USB_STS_RETRIES && |
| (status == -ETIMEDOUT || status == -EPIPE); i++) { |
| status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, |
| data, sizeof(*data), USB_STS_TIMEOUT); |
| } |
| return status; |
| } |
| |
| static int hub_port_status(struct usb_hub *hub, int port1, |
| u16 *status, u16 *change) |
| { |
| int ret; |
| |
| mutex_lock(&hub->status_mutex); |
| ret = get_port_status(hub->hdev, port1, &hub->status->port); |
| if (ret < 4) { |
| if (ret != -ENODEV) |
| dev_err(hub->intfdev, |
| "%s failed (err = %d)\n", __func__, ret); |
| if (ret >= 0) |
| ret = -EIO; |
| } else { |
| *status = le16_to_cpu(hub->status->port.wPortStatus); |
| *change = le16_to_cpu(hub->status->port.wPortChange); |
| |
| ret = 0; |
| } |
| mutex_unlock(&hub->status_mutex); |
| return ret; |
| } |
| |
| static void kick_khubd(struct usb_hub *hub) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&hub_event_lock, flags); |
| if (!hub->disconnected && list_empty(&hub->event_list)) { |
| list_add_tail(&hub->event_list, &hub_event_list); |
| |
| /* Suppress autosuspend until khubd runs */ |
| usb_autopm_get_interface_no_resume( |
| to_usb_interface(hub->intfdev)); |
| wake_up(&khubd_wait); |
| } |
| spin_unlock_irqrestore(&hub_event_lock, flags); |
| } |
| |
| void usb_kick_khubd(struct usb_device *hdev) |
| { |
| struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
| |
| if (hub) |
| kick_khubd(hub); |
| } |
| |
| /* |
| * Let the USB core know that a USB 3.0 device has sent a Function Wake Device |
| * Notification, which indicates it had initiated remote wakeup. |
| * |
| * USB 3.0 hubs do not report the port link state change from U3 to U0 when the |
| * device initiates resume, so the USB core will not receive notice of the |
| * resume through the normal hub interrupt URB. |
| */ |
| void usb_wakeup_notification(struct usb_device *hdev, |
| unsigned int portnum) |
| { |
| struct usb_hub *hub; |
| |
| if (!hdev) |
| return; |
| |
| hub = usb_hub_to_struct_hub(hdev); |
| if (hub) { |
| set_bit(portnum, hub->wakeup_bits); |
| kick_khubd(hub); |
| } |
| } |
| EXPORT_SYMBOL_GPL(usb_wakeup_notification); |
| |
| /* completion function, fires on port status changes and various faults */ |
| static void hub_irq(struct urb *urb) |
| { |
| struct usb_hub *hub = urb->context; |
| int status = urb->status; |
| unsigned i; |
| unsigned long bits; |
| |
| switch (status) { |
| case -ENOENT: /* synchronous unlink */ |
| case -ECONNRESET: /* async unlink */ |
| case -ESHUTDOWN: /* hardware going away */ |
| return; |
| |
| default: /* presumably an error */ |
| /* Cause a hub reset after 10 consecutive errors */ |
| dev_dbg (hub->intfdev, "transfer --> %d\n", status); |
| if ((++hub->nerrors < 10) || hub->error) |
| goto resubmit; |
| hub->error = status; |
| /* FALL THROUGH */ |
| |
| /* let khubd handle things */ |
| case 0: /* we got data: port status changed */ |
| bits = 0; |
| for (i = 0; i < urb->actual_length; ++i) |
| bits |= ((unsigned long) ((*hub->buffer)[i])) |
| << (i*8); |
| hub->event_bits[0] = bits; |
| break; |
| } |
| |
| hub->nerrors = 0; |
| |
| /* Something happened, let khubd figure it out */ |
| kick_khubd(hub); |
| |
| resubmit: |
| if (hub->quiescing) |
| return; |
| |
| if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 |
| && status != -ENODEV && status != -EPERM) |
| dev_err (hub->intfdev, "resubmit --> %d\n", status); |
| } |
| |
| /* USB 2.0 spec Section 11.24.2.3 */ |
| static inline int |
| hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) |
| { |
| /* Need to clear both directions for control ep */ |
| if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == |
| USB_ENDPOINT_XFER_CONTROL) { |
| int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| HUB_CLEAR_TT_BUFFER, USB_RT_PORT, |
| devinfo ^ 0x8000, tt, NULL, 0, 1000); |
| if (status) |
| return status; |
| } |
| return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
| tt, NULL, 0, 1000); |
| } |
| |
| /* |
| * enumeration blocks khubd for a long time. we use keventd instead, since |
| * long blocking there is the exception, not the rule. accordingly, HCDs |
| * talking to TTs must queue control transfers (not just bulk and iso), so |
| * both can talk to the same hub concurrently. |
| */ |
| static void hub_tt_work(struct work_struct *work) |
| { |
| struct usb_hub *hub = |
| container_of(work, struct usb_hub, tt.clear_work); |
| unsigned long flags; |
| |
| spin_lock_irqsave (&hub->tt.lock, flags); |
| while (!list_empty(&hub->tt.clear_list)) { |
| struct list_head *next; |
| struct usb_tt_clear *clear; |
| struct usb_device *hdev = hub->hdev; |
| const struct hc_driver *drv; |
| int status; |
| |
| next = hub->tt.clear_list.next; |
| clear = list_entry (next, struct usb_tt_clear, clear_list); |
| list_del (&clear->clear_list); |
| |
| /* drop lock so HCD can concurrently report other TT errors */ |
| spin_unlock_irqrestore (&hub->tt.lock, flags); |
| status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); |
| if (status && status != -ENODEV) |
| dev_err (&hdev->dev, |
| "clear tt %d (%04x) error %d\n", |
| clear->tt, clear->devinfo, status); |
| |
| /* Tell the HCD, even if the operation failed */ |
| drv = clear->hcd->driver; |
| if (drv->clear_tt_buffer_complete) |
| (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); |
| |
| kfree(clear); |
| spin_lock_irqsave(&hub->tt.lock, flags); |
| } |
| spin_unlock_irqrestore (&hub->tt.lock, flags); |
| } |
| |
| /** |
| * usb_hub_set_port_power - control hub port's power state |
| * @hdev: USB device belonging to the usb hub |
| * @hub: target hub |
| * @port1: port index |
| * @set: expected status |
| * |
| * call this function to control port's power via setting or |
| * clearing the port's PORT_POWER feature. |
| * |
| * Return: 0 if successful. A negative error code otherwise. |
| */ |
| int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, |
| int port1, bool set) |
| { |
| int ret; |
| |
| if (set) |
| ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
| else |
| ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
| |
| if (ret) |
| return ret; |
| |
| if (set) |
| set_bit(port1, hub->power_bits); |
| else |
| clear_bit(port1, hub->power_bits); |
| return 0; |
| } |
| |
| /** |
| * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
| * @urb: an URB associated with the failed or incomplete split transaction |
| * |
| * High speed HCDs use this to tell the hub driver that some split control or |
| * bulk transaction failed in a way that requires clearing internal state of |
| * a transaction translator. This is normally detected (and reported) from |
| * interrupt context. |
| * |
| * It may not be possible for that hub to handle additional full (or low) |
| * speed transactions until that state is fully cleared out. |
| * |
| * Return: 0 if successful. A negative error code otherwise. |
| */ |
| int usb_hub_clear_tt_buffer(struct urb *urb) |
| { |
| struct usb_device *udev = urb->dev; |
| int pipe = urb->pipe; |
| struct usb_tt *tt = udev->tt; |
| unsigned long flags; |
| struct usb_tt_clear *clear; |
| |
| /* we've got to cope with an arbitrary number of pending TT clears, |
| * since each TT has "at least two" buffers that can need it (and |
| * there can be many TTs per hub). even if they're uncommon. |
| */ |
| if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
| dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
| /* FIXME recover somehow ... RESET_TT? */ |
| return -ENOMEM; |
| } |
| |
| /* info that CLEAR_TT_BUFFER needs */ |
| clear->tt = tt->multi ? udev->ttport : 1; |
| clear->devinfo = usb_pipeendpoint (pipe); |
| clear->devinfo |= udev->devnum << 4; |
| clear->devinfo |= usb_pipecontrol (pipe) |
| ? (USB_ENDPOINT_XFER_CONTROL << 11) |
| : (USB_ENDPOINT_XFER_BULK << 11); |
| if (usb_pipein (pipe)) |
| clear->devinfo |= 1 << 15; |
| |
| /* info for completion callback */ |
| clear->hcd = bus_to_hcd(udev->bus); |
| clear->ep = urb->ep; |
| |
| /* tell keventd to clear state for this TT */ |
| spin_lock_irqsave (&tt->lock, flags); |
| list_add_tail (&clear->clear_list, &tt->clear_list); |
| schedule_work(&tt->clear_work); |
| spin_unlock_irqrestore (&tt->lock, flags); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
| |
| static void hub_power_on(struct usb_hub *hub, bool do_delay) |
| { |
| int port1; |
| |
| /* Enable power on each port. Some hubs have reserved values |
| * of LPSM (> 2) in their descriptors, even though they are |
| * USB 2.0 hubs. Some hubs do not implement port-power switching |
| * but only emulate it. In all cases, the ports won't work |
| * unless we send these messages to the hub. |
| */ |
| if (hub_is_port_power_switchable(hub)) |
| dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
| else |
| dev_dbg(hub->intfdev, "trying to enable port power on " |
| "non-switchable hub\n"); |
| for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) |
| if (test_bit(port1, hub->power_bits)) |
| set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); |
| else |
| usb_clear_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_POWER); |
| if (do_delay) |
| msleep(hub_power_on_good_delay(hub)); |
| } |
| |
| static int hub_hub_status(struct usb_hub *hub, |
| u16 *status, u16 *change) |
| { |
| int ret; |
| |
| mutex_lock(&hub->status_mutex); |
| ret = get_hub_status(hub->hdev, &hub->status->hub); |
| if (ret < 0) { |
| if (ret != -ENODEV) |
| dev_err(hub->intfdev, |
| "%s failed (err = %d)\n", __func__, ret); |
| } else { |
| *status = le16_to_cpu(hub->status->hub.wHubStatus); |
| *change = le16_to_cpu(hub->status->hub.wHubChange); |
| ret = 0; |
| } |
| mutex_unlock(&hub->status_mutex); |
| return ret; |
| } |
| |
| static int hub_set_port_link_state(struct usb_hub *hub, int port1, |
| unsigned int link_status) |
| { |
| return set_port_feature(hub->hdev, |
| port1 | (link_status << 3), |
| USB_PORT_FEAT_LINK_STATE); |
| } |
| |
| /* |
| * If USB 3.0 ports are placed into the Disabled state, they will no longer |
| * detect any device connects or disconnects. This is generally not what the |
| * USB core wants, since it expects a disabled port to produce a port status |
| * change event when a new device connects. |
| * |
| * Instead, set the link state to Disabled, wait for the link to settle into |
| * that state, clear any change bits, and then put the port into the RxDetect |
| * state. |
| */ |
| static int hub_usb3_port_disable(struct usb_hub *hub, int port1) |
| { |
| int ret; |
| int total_time; |
| u16 portchange, portstatus; |
| |
| if (!hub_is_superspeed(hub->hdev)) |
| return -EINVAL; |
| |
| ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); |
| if (ret) |
| return ret; |
| |
| /* Wait for the link to enter the disabled state. */ |
| for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { |
| ret = hub_port_status(hub, port1, &portstatus, &portchange); |
| if (ret < 0) |
| return ret; |
| |
| if ((portstatus & USB_PORT_STAT_LINK_STATE) == |
| USB_SS_PORT_LS_SS_DISABLED) |
| break; |
| if (total_time >= HUB_DEBOUNCE_TIMEOUT) |
| break; |
| msleep(HUB_DEBOUNCE_STEP); |
| } |
| if (total_time >= HUB_DEBOUNCE_TIMEOUT) |
| dev_warn(&hub->ports[port1 - 1]->dev, |
| "Could not disable after %d ms\n", total_time); |
| |
| return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); |
| } |
| |
| static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
| { |
| struct usb_port *port_dev = hub->ports[port1 - 1]; |
| struct usb_device *hdev = hub->hdev; |
| int ret = 0; |
| |
| if (port_dev->child && set_state) |
| usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED); |
| if (!hub->error) { |
| if (hub_is_superspeed(hub->hdev)) |
| ret = hub_usb3_port_disable(hub, port1); |
| else |
| ret = usb_clear_port_feature(hdev, port1, |
| USB_PORT_FEAT_ENABLE); |
| } |
| if (ret && ret != -ENODEV) |
| dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret); |
| return ret; |
| } |
| |
| /* |
| * Disable a port and mark a logical connect-change event, so that some |
| * time later khubd will disconnect() any existing usb_device on the port |
| * and will re-enumerate if there actually is a device attached. |
| */ |
| static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) |
| { |
| dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n"); |
| hub_port_disable(hub, port1, 1); |
| |
| /* FIXME let caller ask to power down the port: |
| * - some devices won't enumerate without a VBUS power cycle |
| * - SRP saves power that way |
| * - ... new call, TBD ... |
| * That's easy if this hub can switch power per-port, and |
| * khubd reactivates the port later (timer, SRP, etc). |
| * Powerdown must be optional, because of reset/DFU. |
| */ |
| |
| set_bit(port1, hub->change_bits); |
| kick_khubd(hub); |
| } |
| |
| /** |
| * usb_remove_device - disable a device's port on its parent hub |
| * @udev: device to be disabled and removed |
| * Context: @udev locked, must be able to sleep. |
| * |
| * After @udev's port has been disabled, khubd is notified and it will |
| * see that the device has been disconnected. When the device is |
| * physically unplugged and something is plugged in, the events will |
| * be received and processed normally. |
| * |
| * Return: 0 if successful. A negative error code otherwise. |
| */ |
| int usb_remove_device(struct usb_device *udev) |
| { |
| struct usb_hub *hub; |
| struct usb_interface *intf; |
| |
| if (!udev->parent) /* Can't remove a root hub */ |
| return -EINVAL; |
| hub = usb_hub_to_struct_hub(udev->parent); |
| intf = to_usb_interface(hub->intfdev); |
| |
| usb_autopm_get_interface(intf); |
| set_bit(udev->portnum, hub->removed_bits); |
| hub_port_logical_disconnect(hub, udev->portnum); |
| usb_autopm_put_interface(intf); |
| return 0; |
| } |
| |
| enum hub_activation_type { |
| HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
| HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
| }; |
| |
| static void hub_init_func2(struct work_struct *ws); |
| static void hub_init_func3(struct work_struct *ws); |
| |
| static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
| { |
| struct usb_device *hdev = hub->hdev; |
| struct usb_hcd *hcd; |
| int ret; |
| int port1; |
| int status; |
| bool need_debounce_delay = false; |
| unsigned delay; |
| |
| /* Continue a partial initialization */ |
| if (type == HUB_INIT2) |
| goto init2; |
| if (type == HUB_INIT3) |
| goto init3; |
| |
| /* The superspeed hub except for root hub has to use Hub Depth |
| * value as an offset into the route string to locate the bits |
| * it uses to determine the downstream port number. So hub driver |
| * should send a set hub depth request to superspeed hub after |
| * the superspeed hub is set configuration in initialization or |
| * reset procedure. |
| * |
| * After a resume, port power should still be on. |
| * For any other type of activation, turn it on. |
| */ |
| if (type != HUB_RESUME) { |
| if (hdev->parent && hub_is_superspeed(hdev)) { |
| ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| HUB_SET_DEPTH, USB_RT_HUB, |
| hdev->level - 1, 0, NULL, 0, |
| USB_CTRL_SET_TIMEOUT); |
| if (ret < 0) |
| dev_err(hub->intfdev, |
| "set hub depth failed\n"); |
| } |
| |
| /* Speed up system boot by using a delayed_work for the |
| * hub's initial power-up delays. This is pretty awkward |
| * and the implementation looks like a home-brewed sort of |
| * setjmp/longjmp, but it saves at least 100 ms for each |
| * root hub (assuming usbcore is compiled into the kernel |
| * rather than as a module). It adds up. |
| * |
| * This can't be done for HUB_RESUME or HUB_RESET_RESUME |
| * because for those activation types the ports have to be |
| * operational when we return. In theory this could be done |
| * for HUB_POST_RESET, but it's easier not to. |
| */ |
| if (type == HUB_INIT) { |
| unsigned delay = hub_power_on_good_delay(hub); |
| |
| hub_power_on(hub, false); |
| INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); |
| queue_delayed_work(system_power_efficient_wq, |
| &hub->init_work, |
| msecs_to_jiffies(delay)); |
| |
| /* Suppress autosuspend until init is done */ |
| usb_autopm_get_interface_no_resume( |
| to_usb_interface(hub->intfdev)); |
| return; /* Continues at init2: below */ |
| } else if (type == HUB_RESET_RESUME) { |
| /* The internal host controller state for the hub device |
| * may be gone after a host power loss on system resume. |
| * Update the device's info so the HW knows it's a hub. |
| */ |
| hcd = bus_to_hcd(hdev->bus); |
| if (hcd->driver->update_hub_device) { |
| ret = hcd->driver->update_hub_device(hcd, hdev, |
| &hub->tt, GFP_NOIO); |
| if (ret < 0) { |
| dev_err(hub->intfdev, "Host not " |
| "accepting hub info " |
| "update.\n"); |
| dev_err(hub->intfdev, "LS/FS devices " |
| "and hubs may not work " |
| "under this hub\n."); |
| } |
| } |
| hub_power_on(hub, true); |
| } else { |
| hub_power_on(hub, true); |
| } |
| } |
| init2: |
| |
| /* |
| * Check each port and set hub->change_bits to let khubd know |
| * which ports need attention. |
| */ |
| for (port1 = 1; port1 <= hdev->maxchild; ++port1) { |
| struct usb_port *port_dev = hub->ports[port1 - 1]; |
| struct usb_device *udev = port_dev->child; |
| u16 portstatus, portchange; |
| |
| portstatus = portchange = 0; |
| status = hub_port_status(hub, port1, &portstatus, &portchange); |
| if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) |
| dev_dbg(&port_dev->dev, "status %04x change %04x\n", |
| portstatus, portchange); |
| |
| /* |
| * After anything other than HUB_RESUME (i.e., initialization |
| * or any sort of reset), every port should be disabled. |
| * Unconnected ports should likewise be disabled (paranoia), |
| * and so should ports for which we have no usb_device. |
| */ |
| if ((portstatus & USB_PORT_STAT_ENABLE) && ( |
| type != HUB_RESUME || |
| !(portstatus & USB_PORT_STAT_CONNECTION) || |
| !udev || |
| udev->state == USB_STATE_NOTATTACHED)) { |
| /* |
| * USB3 protocol ports will automatically transition |
| * to Enabled state when detect an USB3.0 device attach. |
| * Do not disable USB3 protocol ports, just pretend |
| * power was lost |
| */ |
| portstatus &= ~USB_PORT_STAT_ENABLE; |
| if (!hub_is_superspeed(hdev)) |
| usb_clear_port_feature(hdev, port1, |
| USB_PORT_FEAT_ENABLE); |
| } |
| |
| /* Clear status-change flags; we'll debounce later */ |
| if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| need_debounce_delay = true; |
| usb_clear_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_C_CONNECTION); |
| } |
| if (portchange & USB_PORT_STAT_C_ENABLE) { |
| need_debounce_delay = true; |
| usb_clear_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_C_ENABLE); |
| } |
| if (portchange & USB_PORT_STAT_C_RESET) { |
| need_debounce_delay = true; |
| usb_clear_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_C_RESET); |
| } |
| if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
| hub_is_superspeed(hub->hdev)) { |
| need_debounce_delay = true; |
| usb_clear_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_C_BH_PORT_RESET); |
| } |
| /* We can forget about a "removed" device when there's a |
| * physical disconnect or the connect status changes. |
| */ |
| if (!(portstatus & USB_PORT_STAT_CONNECTION) || |
| (portchange & USB_PORT_STAT_C_CONNECTION)) |
| clear_bit(port1, hub->removed_bits); |
| |
| if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
| /* Tell khubd to disconnect the device or |
| * check for a new connection |
| */ |
| if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || |
| (portstatus & USB_PORT_STAT_OVERCURRENT)) |
| set_bit(port1, hub->change_bits); |
| |
| } else if (portstatus & USB_PORT_STAT_ENABLE) { |
| bool port_resumed = (portstatus & |
| USB_PORT_STAT_LINK_STATE) == |
| USB_SS_PORT_LS_U0; |
| /* The power session apparently survived the resume. |
| * If there was an overcurrent or suspend change |
| * (i.e., remote wakeup request), have khubd |
| * take care of it. Look at the port link state |
| * for USB 3.0 hubs, since they don't have a suspend |
| * change bit, and they don't set the port link change |
| * bit on device-initiated resume. |
| */ |
| if (portchange || (hub_is_superspeed(hub->hdev) && |
| port_resumed)) |
| set_bit(port1, hub->change_bits); |
| |
| } else if (udev->persist_enabled) { |
| #ifdef CONFIG_PM |
| udev->reset_resume = 1; |
| #endif |
| /* Don't set the change_bits when the device |
| * was powered off. |
| */ |
| if (test_bit(port1, hub->power_bits)) |
| set_bit(port1, hub->change_bits); |
| |
| } else { |
| /* The power session is gone; tell khubd */ |
| usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
| set_bit(port1, hub->change_bits); |
| } |
| } |
| |
| /* If no port-status-change flags were set, we don't need any |
| * debouncing. If flags were set we can try to debounce the |
| * ports all at once right now, instead of letting khubd do them |
| * one at a time later on. |
| * |
| * If any port-status changes do occur during this delay, khubd |
| * will see them later and handle them normally. |
| */ |
| if (need_debounce_delay) { |
| delay = HUB_DEBOUNCE_STABLE; |
| |
| /* Don't do a long sleep inside a workqueue routine */ |
| if (type == HUB_INIT2) { |
| INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); |
| queue_delayed_work(system_power_efficient_wq, |
| &hub->init_work, |
| msecs_to_jiffies(delay)); |
| return; /* Continues at init3: below */ |
| } else { |
| msleep(delay); |
| } |
| } |
| init3: |
| hub->quiescing = 0; |
| |
| status = usb_submit_urb(hub->urb, GFP_NOIO); |
| if (status < 0) |
| dev_err(hub->intfdev, "activate --> %d\n", status); |
| if (hub->has_indicators && blinkenlights) |
| queue_delayed_work(system_power_efficient_wq, |
| &hub->leds, LED_CYCLE_PERIOD); |
| |
| /* Scan all ports that need attention */ |
| kick_khubd(hub); |
| |
| /* Allow autosuspend if it was suppressed */ |
| if (type <= HUB_INIT3) |
| usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); |
| } |
| |
| /* Implement the continuations for the delays above */ |
| static void hub_init_func2(struct work_struct *ws) |
| { |
| struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); |
| |
| hub_activate(hub, HUB_INIT2); |
| } |
| |
| static void hub_init_func3(struct work_struct *ws) |
| { |
| struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); |
| |
| hub_activate(hub, HUB_INIT3); |
| } |
| |
| enum hub_quiescing_type { |
| HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND |
| }; |
| |
| static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) |
| { |
| struct usb_device *hdev = hub->hdev; |
| int i; |
| |
| cancel_delayed_work_sync(&hub->init_work); |
| |
| /* khubd and related activity won't re-trigger */ |
| hub->quiescing = 1; |
| |
| if (type != HUB_SUSPEND) { |
| /* Disconnect all the children */ |
| for (i = 0; i < hdev->maxchild; ++i) { |
| if (hub->ports[i]->child) |
| usb_disconnect(&hub->ports[i]->child); |
| } |
| } |
| |
| /* Stop khubd and related activity */ |
| usb_kill_urb(hub->urb); |
| if (hub->has_indicators) |
| cancel_delayed_work_sync(&hub->leds); |
| if (hub->tt.hub) |
| flush_work(&hub->tt.clear_work); |
| } |
| |
| static void hub_pm_barrier_for_all_ports(struct usb_hub *hub) |
| { |
| int i; |
| |
| for (i = 0; i < hub->hdev->maxchild; ++i) |
| pm_runtime_barrier(&hub->ports[i]->dev); |
| } |
| |
| /* caller has locked the hub device */ |
| static int hub_pre_reset(struct usb_interface *intf) |
| { |
| struct usb_hub *hub = usb_get_intfdata(intf); |
| |
| hub_quiesce(hub, HUB_PRE_RESET); |
| hub->in_reset = 1; |
| hub_pm_barrier_for_all_ports(hub); |
| return 0; |
| } |
| |
| /* caller has locked the hub device */ |
| static int hub_post_reset(struct usb_interface *intf) |
| { |
| struct usb_hub *hub = usb_get_intfdata(intf); |
| |
| hub->in_reset = 0; |
| hub_pm_barrier_for_all_ports(hub); |
| hub_activate(hub, HUB_POST_RESET); |
| return 0; |
| } |
| |
| static int hub_configure(struct usb_hub *hub, |
| struct usb_endpoint_descriptor *endpoint) |
| { |
| struct usb_hcd *hcd; |
| struct usb_device *hdev = hub->hdev; |
| struct device *hub_dev = hub->intfdev; |
| u16 hubstatus, hubchange; |
| u16 wHubCharacteristics; |
| unsigned int pipe; |
| int maxp, ret, i; |
| char *message = "out of memory"; |
| unsigned unit_load; |
| unsigned full_load; |
| unsigned maxchild; |
| |
| hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
| if (!hub->buffer) { |
| ret = -ENOMEM; |
| goto fail; |
| } |
| |
| hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); |
| if (!hub->status) { |
| ret = -ENOMEM; |
| goto fail; |
| } |
| mutex_init(&hub->status_mutex); |
| |
| hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); |
| if (!hub->descriptor) { |
| ret = -ENOMEM; |
| goto fail; |
| } |
| |
| /* Request the entire hub descriptor. |
| * hub->descriptor can handle USB_MAXCHILDREN ports, |
| * but the hub can/will return fewer bytes here. |
| */ |
| ret = get_hub_descriptor(hdev, hub->descriptor); |
| if (ret < 0) { |
| message = "can't read hub descriptor"; |
| goto fail; |
| } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { |
| message = "hub has too many ports!"; |
| ret = -ENODEV; |
| goto fail; |
| } else if (hub->descriptor->bNbrPorts == 0) { |
| message = "hub doesn't have any ports!"; |
| ret = -ENODEV; |
| goto fail; |
| } |
| |
| maxchild = hub->descriptor->bNbrPorts; |
| dev_info(hub_dev, "%d port%s detected\n", maxchild, |
| (maxchild == 1) ? "" : "s"); |
| |
| hub->ports = kzalloc(maxchild * sizeof(struct usb_port *), GFP_KERNEL); |
| if (!hub->ports) { |
| ret = -ENOMEM; |
| goto fail; |
| } |
| |
| wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
| if (hub_is_superspeed(hdev)) { |
| unit_load = 150; |
| full_load = 900; |
| } else { |
| unit_load = 100; |
| full_load = 500; |
| } |
| |
| /* FIXME for USB 3.0, skip for now */ |
| if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && |
| !(hub_is_superspeed(hdev))) { |
| int i; |
| char portstr[USB_MAXCHILDREN + 1]; |
| |
| for (i = 0; i < maxchild; i++) |
| portstr[i] = hub->descriptor->u.hs.DeviceRemovable |
| [((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
| ? 'F' : 'R'; |
| portstr[maxchild] = 0; |
| dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); |
| } else |
| dev_dbg(hub_dev, "standalone hub\n"); |
| |
| switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
| case HUB_CHAR_COMMON_LPSM: |
| dev_dbg(hub_dev, "ganged power switching\n"); |
| break; |
| case HUB_CHAR_INDV_PORT_LPSM: |
| dev_dbg(hub_dev, "individual port power switching\n"); |
| break; |
| case HUB_CHAR_NO_LPSM: |
| case HUB_CHAR_LPSM: |
| dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); |
| break; |
| } |
| |
| switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
| case HUB_CHAR_COMMON_OCPM: |
| dev_dbg(hub_dev, "global over-current protection\n"); |
| break; |
| case HUB_CHAR_INDV_PORT_OCPM: |
| dev_dbg(hub_dev, "individual port over-current protection\n"); |
| break; |
| case HUB_CHAR_NO_OCPM: |
| case HUB_CHAR_OCPM: |
| dev_dbg(hub_dev, "no over-current protection\n"); |
| break; |
| } |
| |
| spin_lock_init (&hub->tt.lock); |
| INIT_LIST_HEAD (&hub->tt.clear_list); |
| INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
| switch (hdev->descriptor.bDeviceProtocol) { |
| case USB_HUB_PR_FS: |
| break; |
| case USB_HUB_PR_HS_SINGLE_TT: |
| dev_dbg(hub_dev, "Single TT\n"); |
| hub->tt.hub = hdev; |
| break; |
| case USB_HUB_PR_HS_MULTI_TT: |
| ret = usb_set_interface(hdev, 0, 1); |
| if (ret == 0) { |
| dev_dbg(hub_dev, "TT per port\n"); |
| hub->tt.multi = 1; |
| } else |
| dev_err(hub_dev, "Using single TT (err %d)\n", |
| ret); |
| hub->tt.hub = hdev; |
| break; |
| case USB_HUB_PR_SS: |
| /* USB 3.0 hubs don't have a TT */ |
| break; |
| default: |
| dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", |
| hdev->descriptor.bDeviceProtocol); |
| break; |
| } |
| |
| /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
| switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
| case HUB_TTTT_8_BITS: |
| if (hdev->descriptor.bDeviceProtocol != 0) { |
| hub->tt.think_time = 666; |
| dev_dbg(hub_dev, "TT requires at most %d " |
| "FS bit times (%d ns)\n", |
| 8, hub->tt.think_time); |
| } |
| break; |
| case HUB_TTTT_16_BITS: |
| hub->tt.think_time = 666 * 2; |
| dev_dbg(hub_dev, "TT requires at most %d " |
| "FS bit times (%d ns)\n", |
| 16, hub->tt.think_time); |
| break; |
| case HUB_TTTT_24_BITS: |
| hub->tt.think_time = 666 * 3; |
| dev_dbg(hub_dev, "TT requires at most %d " |
| "FS bit times (%d ns)\n", |
| 24, hub->tt.think_time); |
| break; |
| case HUB_TTTT_32_BITS: |
| hub->tt.think_time = 666 * 4; |
| dev_dbg(hub_dev, "TT requires at most %d " |
| "FS bit times (%d ns)\n", |
| 32, hub->tt.think_time); |
| break; |
| } |
| |
| /* probe() zeroes hub->indicator[] */ |
| if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
| hub->has_indicators = 1; |
| dev_dbg(hub_dev, "Port indicators are supported\n"); |
| } |
| |
| dev_dbg(hub_dev, "power on to power good time: %dms\n", |
| hub->descriptor->bPwrOn2PwrGood * 2); |
| |
| /* power budgeting mostly matters with bus-powered hubs, |
| * and battery-powered root hubs (may provide just 8 mA). |
| */ |
| ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); |
| if (ret) { |
| message = "can't get hub status"; |
| goto fail; |
| } |
| hcd = bus_to_hcd(hdev->bus); |
| if (hdev == hdev->bus->root_hub) { |
| if (hcd->power_budget > 0) |
| hdev->bus_mA = hcd->power_budget; |
| else |
| hdev->bus_mA = full_load * maxchild; |
| if (hdev->bus_mA >= full_load) |
| hub->mA_per_port = full_load; |
| else { |
| hub->mA_per_port = hdev->bus_mA; |
| hub->limited_power = 1; |
| } |
| } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
| int remaining = hdev->bus_mA - |
| hub->descriptor->bHubContrCurrent; |
| |
| dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
| hub->descriptor->bHubContrCurrent); |
| hub->limited_power = 1; |
| |
| if (remaining < maxchild * unit_load) |
| dev_warn(hub_dev, |
| "insufficient power available " |
| "to use all downstream ports\n"); |
| hub->mA_per_port = unit_load; /* 7.2.1 */ |
| |
| } else { /* Self-powered external hub */ |
| /* FIXME: What about battery-powered external hubs that |
| * provide less current per port? */ |
| hub->mA_per_port = full_load; |
| } |
| if (hub->mA_per_port < full_load) |
| dev_dbg(hub_dev, "%umA bus power budget for each child\n", |
| hub->mA_per_port); |
| |
| /* Update the HCD's internal representation of this hub before khubd |
| * starts getting port status changes for devices under the hub. |
| */ |
| if (hcd->driver->update_hub_device) { |
| ret = hcd->driver->update_hub_device(hcd, hdev, |
| &hub->tt, GFP_KERNEL); |
| if (ret < 0) { |
| message = "can't update HCD hub info"; |
| goto fail; |
| } |
| } |
| |
| ret = hub_hub_status(hub, &hubstatus, &hubchange); |
| if (ret < 0) { |
| message = "can't get hub status"; |
| goto fail; |
| } |
| |
| /* local power status reports aren't always correct */ |
| if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) |
| dev_dbg(hub_dev, "local power source is %s\n", |
| (hubstatus & HUB_STATUS_LOCAL_POWER) |
| ? "lost (inactive)" : "good"); |
| |
| if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
| dev_dbg(hub_dev, "%sover-current condition exists\n", |
| (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); |
| |
| /* set up the interrupt endpoint |
| * We use the EP's maxpacket size instead of (PORTS+1+7)/8 |
| * bytes as USB2.0[11.12.3] says because some hubs are known |
| * to send more data (and thus cause overflow). For root hubs, |
| * maxpktsize is defined in hcd.c's fake endpoint descriptors |
| * to be big enough for at least USB_MAXCHILDREN ports. */ |
| pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
| maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); |
| |
| if (maxp > sizeof(*hub->buffer)) |
| maxp = sizeof(*hub->buffer); |
| |
| hub->urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!hub->urb) { |
| ret = -ENOMEM; |
| goto fail; |
| } |
| |
| usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, |
| hub, endpoint->bInterval); |
| |
| /* maybe cycle the hub leds */ |
| if (hub->has_indicators && blinkenlights) |
| hub->indicator[0] = INDICATOR_CYCLE; |
| |
| mutex_lock(&usb_port_peer_mutex); |
| for (i = 0; i < maxchild; i++) { |
| ret = usb_hub_create_port_device(hub, i + 1); |
| if (ret < 0) { |
| dev_err(hub->intfdev, |
| "couldn't create port%d device.\n", i + 1); |
| break; |
| } |
| } |
| hdev->maxchild = i; |
| mutex_unlock(&usb_port_peer_mutex); |
| if (ret < 0) |
| goto fail; |
| |
| usb_hub_adjust_deviceremovable(hdev, hub->descriptor); |
| |
| hub_activate(hub, HUB_INIT); |
| return 0; |
| |
| fail: |
| dev_err (hub_dev, "config failed, %s (err %d)\n", |
| message, ret); |
| /* hub_disconnect() frees urb and descriptor */ |
| return ret; |
| } |
| |
| static void hub_release(struct kref *kref) |
| { |
| struct usb_hub *hub = container_of(kref, struct usb_hub, kref); |
| |
| usb_put_intf(to_usb_interface(hub->intfdev)); |
| kfree(hub); |
| } |
| |
| static unsigned highspeed_hubs; |
| |
| static void hub_disconnect(struct usb_interface *intf) |
| { |
| struct usb_hub *hub = usb_get_intfdata(intf); |
| struct usb_device *hdev = interface_to_usbdev(intf); |
| int port1; |
| |
| /* Take the hub off the event list and don't let it be added again */ |
| spin_lock_irq(&hub_event_lock); |
| if (!list_empty(&hub->event_list)) { |
| list_del_init(&hub->event_list); |
| usb_autopm_put_interface_no_suspend(intf); |
| } |
| hub->disconnected = 1; |
| spin_unlock_irq(&hub_event_lock); |
| |
| /* Disconnect all children and quiesce the hub */ |
| hub->error = 0; |
| hub_quiesce(hub, HUB_DISCONNECT); |
| |
| mutex_lock(&usb_port_peer_mutex); |
| |
| /* Avoid races with recursively_mark_NOTATTACHED() */ |
| spin_lock_irq(&device_state_lock); |
| port1 = hdev->maxchild; |
| hdev->maxchild = 0; |
| usb_set_intfdata(intf, NULL); |
| spin_unlock_irq(&device_state_lock); |
| |
| for (; port1 > 0; --port1) |
| usb_hub_remove_port_device(hub, port1); |
| |
| mutex_unlock(&usb_port_peer_mutex); |
| |
| if (hub->hdev->speed == USB_SPEED_HIGH) |
| highspeed_hubs--; |
| |
| usb_free_urb(hub->urb); |
| kfree(hub->ports); |
| kfree(hub->descriptor); |
| kfree(hub->status); |
| kfree(hub->buffer); |
| |
| pm_suspend_ignore_children(&intf->dev, false); |
| kref_put(&hub->kref, hub_release); |
| } |
| |
| static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) |
| { |
| struct usb_host_interface *desc; |
| struct usb_endpoint_descriptor *endpoint; |
| struct usb_device *hdev; |
| struct usb_hub *hub; |
| |
| desc = intf->cur_altsetting; |
| hdev = interface_to_usbdev(intf); |
| |
| /* |
| * Set default autosuspend delay as 0 to speedup bus suspend, |
| * based on the below considerations: |
| * |
| * - Unlike other drivers, the hub driver does not rely on the |
| * autosuspend delay to provide enough time to handle a wakeup |
| * event, and the submitted status URB is just to check future |
| * change on hub downstream ports, so it is safe to do it. |
| * |
| * - The patch might cause one or more auto supend/resume for |
| * below very rare devices when they are plugged into hub |
| * first time: |
| * |
| * devices having trouble initializing, and disconnect |
| * themselves from the bus and then reconnect a second |
| * or so later |
| * |
| * devices just for downloading firmware, and disconnects |
| * themselves after completing it |
| * |
| * For these quite rare devices, their drivers may change the |
| * autosuspend delay of their parent hub in the probe() to one |
| * appropriate value to avoid the subtle problem if someone |
| * does care it. |
| * |
| * - The patch may cause one or more auto suspend/resume on |
| * hub during running 'lsusb', but it is probably too |
| * infrequent to worry about. |
| * |
| * - Change autosuspend delay of hub can avoid unnecessary auto |
| * suspend timer for hub, also may decrease power consumption |
| * of USB bus. |
| */ |
| pm_runtime_set_autosuspend_delay(&hdev->dev, 0); |
| |
| /* |
| * Hubs have proper suspend/resume support, except for root hubs |
| * where the controller driver doesn't have bus_suspend and |
| * bus_resume methods. |
| */ |
| if (hdev->parent) { /* normal device */ |
| usb_enable_autosuspend(hdev); |
| } else { /* root hub */ |
| const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; |
| |
| if (drv->bus_suspend && drv->bus_resume) |
| usb_enable_autosuspend(hdev); |
| } |
| |
| if (hdev->level == MAX_TOPO_LEVEL) { |
| dev_err(&intf->dev, |
| "Unsupported bus topology: hub nested too deep\n"); |
| return -E2BIG; |
| } |
| |
| #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
| if (hdev->parent) { |
| dev_warn(&intf->dev, "ignoring external hub\n"); |
| return -ENODEV; |
| } |
| #endif |
| |
| /* Some hubs have a subclass of 1, which AFAICT according to the */ |
| /* specs is not defined, but it works */ |
| if ((desc->desc.bInterfaceSubClass != 0) && |
| (desc->desc.bInterfaceSubClass != 1)) { |
| descriptor_error: |
| dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); |
| return -EIO; |
| } |
| |
| /* Multiple endpoints? What kind of mutant ninja-hub is this? */ |
| if (desc->desc.bNumEndpoints != 1) |
| goto descriptor_error; |
| |
| endpoint = &desc->endpoint[0].desc; |
| |
| /* If it's not an interrupt in endpoint, we'd better punt! */ |
| if (!usb_endpoint_is_int_in(endpoint)) |
| goto descriptor_error; |
| |
| /* We found a hub */ |
| dev_info (&intf->dev, "USB hub found\n"); |
| |
| hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
| if (!hub) { |
| dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); |
| return -ENOMEM; |
| } |
| |
| kref_init(&hub->kref); |
| INIT_LIST_HEAD(&hub->event_list); |
| hub->intfdev = &intf->dev; |
| hub->hdev = hdev; |
| INIT_DELAYED_WORK(&hub->leds, led_work); |
| INIT_DELAYED_WORK(&hub->init_work, NULL); |
| usb_get_intf(intf); |
| |
| usb_set_intfdata (intf, hub); |
| intf->needs_remote_wakeup = 1; |
| pm_suspend_ignore_children(&intf->dev, true); |
| |
| if (hdev->speed == USB_SPEED_HIGH) |
| highspeed_hubs++; |
| |
| if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) |
| hub->quirk_check_port_auto_suspend = 1; |
| |
| if (hub_configure(hub, endpoint) >= 0) |
| return 0; |
| |
| hub_disconnect (intf); |
| return -ENODEV; |
| } |
| |
| static int |
| hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) |
| { |
| struct usb_device *hdev = interface_to_usbdev (intf); |
| struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
| |
| /* assert ifno == 0 (part of hub spec) */ |
| switch (code) { |
| case USBDEVFS_HUB_PORTINFO: { |
| struct usbdevfs_hub_portinfo *info = user_data; |
| int i; |
| |
| spin_lock_irq(&device_state_lock); |
| if (hdev->devnum <= 0) |
| info->nports = 0; |
| else { |
| info->nports = hdev->maxchild; |
| for (i = 0; i < info->nports; i++) { |
| if (hub->ports[i]->child == NULL) |
| info->port[i] = 0; |
| else |
| info->port[i] = |
| hub->ports[i]->child->devnum; |
| } |
| } |
| spin_unlock_irq(&device_state_lock); |
| |
| return info->nports + 1; |
| } |
| |
| default: |
| return -ENOSYS; |
| } |
| } |
| |
| /* |
| * Allow user programs to claim ports on a hub. When a device is attached |
| * to one of these "claimed" ports, the program will "own" the device. |
| */ |
| static int find_port_owner(struct usb_device *hdev, unsigned port1, |
| struct usb_dev_state ***ppowner) |
| { |
| struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
| |
| if (hdev->state == USB_STATE_NOTATTACHED) |
| return -ENODEV; |
| if (port1 == 0 || port1 > hdev->maxchild) |
| return -EINVAL; |
| |
| /* Devices not managed by the hub driver |
| * will always have maxchild equal to 0. |
| */ |
| *ppowner = &(hub->ports[port1 - 1]->port_owner); |
| return 0; |
| } |
| |
| /* In the following three functions, the caller must hold hdev's lock */ |
| int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, |
| struct usb_dev_state *owner) |
| { |
| int rc; |
| struct usb_dev_state **powner; |
| |
| rc = find_port_owner(hdev, port1, &powner); |
| if (rc) |
| return rc; |
| if (*powner) |
| return -EBUSY; |
| *powner = owner; |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(usb_hub_claim_port); |
| |
| int usb_hub_release_port(struct usb_device *hdev, unsigned port1, |
| struct usb_dev_state *owner) |
| { |
| int rc; |
| struct usb_dev_state **powner; |
| |
| rc = find_port_owner(hdev, port1, &powner); |
| if (rc) |
| return rc; |
| if (*powner != owner) |
| return -ENOENT; |
| *powner = NULL; |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(usb_hub_release_port); |
| |
| void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner) |
| { |
| struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
| int n; |
| |
| for (n = 0; n < hdev->maxchild; n++) { |
| if (hub->ports[n]->port_owner == owner) |
| hub->ports[n]->port_owner = NULL; |
| } |
| |
| } |
| |
| /* The caller must hold udev's lock */ |
| bool usb_device_is_owned(struct usb_device *udev) |
| { |
| struct usb_hub *hub; |
| |
| if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) |
| return false; |
| hub = usb_hub_to_struct_hub(udev->parent); |
| return !!hub->ports[udev->portnum - 1]->port_owner; |
| } |
| |
| static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
| { |
| struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
| int i; |
| |
| for (i = 0; i < udev->maxchild; ++i) { |
| if (hub->ports[i]->child) |
| recursively_mark_NOTATTACHED(hub->ports[i]->child); |
| } |
| if (udev->state == USB_STATE_SUSPENDED) |
| udev->active_duration -= jiffies; |
| udev->state = USB_STATE_NOTATTACHED; |
| } |
| |
| /** |
| * usb_set_device_state - change a device's current state (usbcore, hcds) |
| * @udev: pointer to device whose state should be changed |
| * @new_state: new state value to be stored |
| * |
| * udev->state is _not_ fully protected by the device lock. Although |
| * most transitions are made only while holding the lock, the state can |
| * can change to USB_STATE_NOTATTACHED at almost any time. This |
| * is so that devices can be marked as disconnected as soon as possible, |
| * without having to wait for any semaphores to be released. As a result, |
| * all changes to any device's state must be protected by the |
| * device_state_lock spinlock. |
| * |
| * Once a device has been added to the device tree, all changes to its state |
| * should be made using this routine. The state should _not_ be set directly. |
| * |
| * If udev->state is already USB_STATE_NOTATTACHED then no change is made. |
| * Otherwise udev->state is set to new_state, and if new_state is |
| * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set |
| * to USB_STATE_NOTATTACHED. |
| */ |
| void usb_set_device_state(struct usb_device *udev, |
| enum usb_device_state new_state) |
| { |
| unsigned long flags; |
| int wakeup = -1; |
| |
| spin_lock_irqsave(&device_state_lock, flags); |
| if (udev->state == USB_STATE_NOTATTACHED) |
| ; /* do nothing */ |
| else if (new_state != USB_STATE_NOTATTACHED) { |
| |
| /* root hub wakeup capabilities are managed out-of-band |
| * and may involve silicon errata ... ignore them here. |
| */ |
| if (udev->parent) { |
| if (udev->state == USB_STATE_SUSPENDED |
| || new_state == USB_STATE_SUSPENDED) |
| ; /* No change to wakeup settings */ |
| else if (new_state == USB_STATE_CONFIGURED) |
| wakeup = udev->actconfig->desc.bmAttributes |
| & USB_CONFIG_ATT_WAKEUP; |
| else |
| wakeup = 0; |
| } |
| if (udev->state == USB_STATE_SUSPENDED && |
| new_state != USB_STATE_SUSPENDED) |
| udev->active_duration -= jiffies; |
| else if (new_state == USB_STATE_SUSPENDED && |
| udev->state != USB_STATE_SUSPENDED) |
| udev->active_duration += jiffies; |
| udev->state = new_state; |
| } else |
| recursively_mark_NOTATTACHED(udev); |
| spin_unlock_irqrestore(&device_state_lock, flags); |
| if (wakeup >= 0) |
| device_set_wakeup_capable(&udev->dev, wakeup); |
| } |
| EXPORT_SYMBOL_GPL(usb_set_device_state); |
| |
| /* |
| * Choose a device number. |
| * |
| * Device numbers are used as filenames in usbfs. On USB-1.1 and |
| * USB-2.0 buses they are also used as device addresses, however on |
| * USB-3.0 buses the address is assigned by the controller hardware |
| * and it usually is not the same as the device number. |
| * |
| * WUSB devices are simple: they have no hubs behind, so the mapping |
| * device <-> virtual port number becomes 1:1. Why? to simplify the |
| * life of the device connection logic in |
| * drivers/usb/wusbcore/devconnect.c. When we do the initial secret |
| * handshake we need to assign a temporary address in the unauthorized |
| * space. For simplicity we use the first virtual port number found to |
| * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] |
| * and that becomes it's address [X < 128] or its unauthorized address |
| * [X | 0x80]. |
| * |
| * We add 1 as an offset to the one-based USB-stack port number |
| * (zero-based wusb virtual port index) for two reasons: (a) dev addr |
| * 0 is reserved by USB for default address; (b) Linux's USB stack |
| * uses always #1 for the root hub of the controller. So USB stack's |
| * port #1, which is wusb virtual-port #0 has address #2. |
| * |
| * Devices connected under xHCI are not as simple. The host controller |
| * supports virtualization, so the hardware assigns device addresses and |
| * the HCD must setup data structures before issuing a set address |
| * command to the hardware. |
| */ |
| static void choose_devnum(struct usb_device *udev) |
| { |
| int devnum; |
| struct usb_bus *bus = udev->bus; |
| |
| /* If khubd ever becomes multithreaded, this will need a lock */ |
| if (udev->wusb) { |
| devnum = udev->portnum + 1; |
| BUG_ON(test_bit(devnum, bus->devmap.devicemap)); |
| } else { |
| /* Try to allocate the next devnum beginning at |
| * bus->devnum_next. */ |
| devnum = find_next_zero_bit(bus->devmap.devicemap, 128, |
| bus->devnum_next); |
| if (devnum >= 128) |
| devnum = find_next_zero_bit(bus->devmap.devicemap, |
| 128, 1); |
| bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); |
| } |
| if (devnum < 128) { |
| set_bit(devnum, bus->devmap.devicemap); |
| udev->devnum = devnum; |
| } |
| } |
| |
| static void release_devnum(struct usb_device *udev) |
| { |
| if (udev->devnum > 0) { |
| clear_bit(udev->devnum, udev->bus->devmap.devicemap); |
| udev->devnum = -1; |
| } |
| } |
| |
| static void update_devnum(struct usb_device *udev, int devnum) |
| { |
| /* The address for a WUSB device is managed by wusbcore. */ |
| if (!udev->wusb) |
| udev->devnum = devnum; |
| } |
| |
| static void hub_free_dev(struct usb_device *udev) |
| { |
| struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| |
| /* Root hubs aren't real devices, so don't free HCD resources */ |
| if (hcd->driver->free_dev && udev->parent) |
| hcd->driver->free_dev(hcd, udev); |
| } |
| |
| static void hub_disconnect_children(struct usb_device *udev) |
| { |
| struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
| int i; |
| |
| /* Free up all the children before we remove this device */ |
| for (i = 0; i < udev->maxchild; i++) { |
| if (hub->ports[i]->child) |
| usb_disconnect(&hub->ports[i]->child); |
| } |
| } |
| |
| /** |
| * usb_disconnect - disconnect a device (usbcore-internal) |
| * @pdev: pointer to device being disconnected |
| * Context: !in_interrupt () |
| * |
| * Something got disconnected. Get rid of it and all of its children. |
| * |
| * If *pdev is a normal device then the parent hub must already be locked. |
| * If *pdev is a root hub then the caller must hold the usb_bus_list_lock, |
| * which protects the set of root hubs as well as the list of buses. |
| * |
| * Only hub drivers (including virtual root hub drivers for host |
| * controllers) should ever call this. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| */ |
| void usb_disconnect(struct usb_device **pdev) |
| { |
| struct usb_port *port_dev = NULL; |
| struct usb_device *udev = *pdev; |
| struct usb_hub *hub; |
| int port1; |
| |
| /* mark the device as inactive, so any further urb submissions for |
| * this device (and any of its children) will fail immediately. |
| * this quiesces everything except pending urbs. |
| */ |
| usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
| dev_info(&udev->dev, "USB disconnect, device number %d\n", |
| udev->devnum); |
| |
| usb_lock_device(udev); |
| |
| hub_disconnect_children(udev); |
| |
| /* deallocate hcd/hardware state ... nuking all pending urbs and |
| * cleaning up all state associated with the current configuration |
| * so that the hardware is now fully quiesced. |
| */ |
| dev_dbg (&udev->dev, "unregistering device\n"); |
| usb_disable_device(udev, 0); |
| usb_hcd_synchronize_unlinks(udev); |
| |
| if (udev->parent) { |
| port1 = udev->portnum; |
| hub = usb_hub_to_struct_hub(udev->parent); |
| port_dev = hub->ports[port1 - 1]; |
| |
| sysfs_remove_link(&udev->dev.kobj, "port"); |
| sysfs_remove_link(&port_dev->dev.kobj, "device"); |
| |
| /* |
| * As usb_port_runtime_resume() de-references udev, make |
| * sure no resumes occur during removal |
| */ |
| if (!test_and_set_bit(port1, hub->child_usage_bits)) |
| pm_runtime_get_sync(&port_dev->dev); |
| } |
| |
| usb_remove_ep_devs(&udev->ep0); |
| usb_unlock_device(udev); |
| |
| /* Unregister the device. The device driver is responsible |
| * for de-configuring the device and invoking the remove-device |
| * notifier chain (used by usbfs and possibly others). |
| */ |
| device_del(&udev->dev); |
| |
| /* Free the device number and delete the parent's children[] |
| * (or root_hub) pointer. |
| */ |
| release_devnum(udev); |
| |
| /* Avoid races with recursively_mark_NOTATTACHED() */ |
| spin_lock_irq(&device_state_lock); |
| *pdev = NULL; |
| spin_unlock_irq(&device_state_lock); |
| |
| if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits)) |
| pm_runtime_put(&port_dev->dev); |
| |
| hub_free_dev(udev); |
| |
| put_device(&udev->dev); |
| } |
| |
| #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
| static void show_string(struct usb_device *udev, char *id, char *string) |
| { |
| if (!string) |
| return; |
| dev_info(&udev->dev, "%s: %s\n", id, string); |
| } |
| |
| static void announce_device(struct usb_device *udev) |
| { |
| dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", |
| le16_to_cpu(udev->descriptor.idVendor), |
| le16_to_cpu(udev->descriptor.idProduct)); |
| dev_info(&udev->dev, |
| "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", |
| udev->descriptor.iManufacturer, |
| udev->descriptor.iProduct, |
| udev->descriptor.iSerialNumber); |
| show_string(udev, "Product", udev->product); |
| show_string(udev, "Manufacturer", udev->manufacturer); |
| show_string(udev, "SerialNumber", udev->serial); |
| } |
| #else |
| static inline void announce_device(struct usb_device *udev) { } |
| #endif |
| |
| #ifdef CONFIG_USB_OTG |
| #include "otg_whitelist.h" |
| #endif |
| |
| /** |
| * usb_enumerate_device_otg - FIXME (usbcore-internal) |
| * @udev: newly addressed device (in ADDRESS state) |
| * |
| * Finish enumeration for On-The-Go devices |
| * |
| * Return: 0 if successful. A negative error code otherwise. |
| */ |
| static int usb_enumerate_device_otg(struct usb_device *udev) |
| { |
| int err = 0; |
| |
| #ifdef CONFIG_USB_OTG |
| /* |
| * OTG-aware devices on OTG-capable root hubs may be able to use SRP, |
| * to wake us after we've powered off VBUS; and HNP, switching roles |
| * "host" to "peripheral". The OTG descriptor helps figure this out. |
| */ |
| if (!udev->bus->is_b_host |
| && udev->config |
| && udev->parent == udev->bus->root_hub) { |
| struct usb_otg_descriptor *desc = NULL; |
| struct usb_bus *bus = udev->bus; |
| |
| /* descriptor may appear anywhere in config */ |
| if (__usb_get_extra_descriptor (udev->rawdescriptors[0], |
| le16_to_cpu(udev->config[0].desc.wTotalLength), |
| USB_DT_OTG, (void **) &desc) == 0) { |
| if (desc->bmAttributes & USB_OTG_HNP) { |
| unsigned port1 = udev->portnum; |
| |
| dev_info(&udev->dev, |
| "Dual-Role OTG device on %sHNP port\n", |
| (port1 == bus->otg_port) |
| ? "" : "non-"); |
| |
| /* enable HNP before suspend, it's simpler */ |
| if (port1 == bus->otg_port) |
| bus->b_hnp_enable = 1; |
| err = usb_control_msg(udev, |
| usb_sndctrlpipe(udev, 0), |
| USB_REQ_SET_FEATURE, 0, |
| bus->b_hnp_enable |
| ? USB_DEVICE_B_HNP_ENABLE |
| : USB_DEVICE_A_ALT_HNP_SUPPORT, |
| 0, NULL, 0, USB_CTRL_SET_TIMEOUT); |
| if (err < 0) { |
| /* OTG MESSAGE: report errors here, |
| * customize to match your product. |
| */ |
| dev_info(&udev->dev, |
| "can't set HNP mode: %d\n", |
| err); |
| bus->b_hnp_enable = 0; |
| } |
| } |
| } |
| } |
| |
| if (!is_targeted(udev)) { |
| |
| /* Maybe it can talk to us, though we can't talk to it. |
| * (Includes HNP test device.) |
| */ |
| if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { |
| err = usb_port_suspend(udev, PMSG_SUSPEND); |
| if (err < 0) |
| dev_dbg(&udev->dev, "HNP fail, %d\n", err); |
| } |
| err = -ENOTSUPP; |
| goto fail; |
| } |
| fail: |
| #endif |
| return err; |
| } |
| |
| |
| /** |
| * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
| * @udev: newly addressed device (in ADDRESS state) |
| * |
| * This is only called by usb_new_device() and usb_authorize_device() |
| * and FIXME -- all comments that apply to them apply here wrt to |
| * environment. |
| * |
| * If the device is WUSB and not authorized, we don't attempt to read |
| * the string descriptors, as they will be errored out by the device |
| * until it has been authorized. |
| * |
| * Return: 0 if successful. A negative error code otherwise. |
| */ |
| static int usb_enumerate_device(struct usb_device *udev) |
| { |
| int err; |
| |
| if (udev->config == NULL) { |
| err = usb_get_configuration(udev); |
| if (err < 0) { |
| if (err != -ENODEV) |
| dev_err(&udev->dev, "can't read configurations, error %d\n", |
| err); |
| return err; |
| } |
| } |
| |
| /* read the standard strings and cache them if present */ |
| udev->product = usb_cache_string(udev, udev->descriptor.iProduct); |
| udev->manufacturer = usb_cache_string(udev, |
| udev->descriptor.iManufacturer); |
| udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); |
| |
| err = usb_enumerate_device_otg(udev); |
| if (err < 0) |
| return err; |
| |
| usb_detect_interface_quirks(udev); |
| |
| return 0; |
| } |
| |
| static void set_usb_port_removable(struct usb_device *udev) |
| { |
| struct usb_device *hdev = udev->parent; |
| struct usb_hub *hub; |
| u8 port = udev->portnum; |
| u16 wHubCharacteristics; |
| bool removable = true; |
| |
| if (!hdev) |
| return; |
| |
| hub = usb_hub_to_struct_hub(udev->parent); |
| |
| wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
| |
| if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) |
| return; |
| |
| if (hub_is_superspeed(hdev)) { |
| if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) |
| & (1 << port)) |
| removable = false; |
| } else { |
| if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) |
| removable = false; |
| } |
| |
| if (removable) |
| udev->removable = USB_DEVICE_REMOVABLE; |
| else |
| udev->removable = USB_DEVICE_FIXED; |
| |
| /* |
| * Platform firmware may have populated an alternative value for |
| * removable. If the parent port has a known connect_type use |
| * that instead. |
| */ |
| switch (hub->ports[udev->portnum - 1]->connect_type) { |
| case USB_PORT_CONNECT_TYPE_HOT_PLUG: |
| udev->removable = USB_DEVICE_REMOVABLE; |
| break; |
| case USB_PORT_CONNECT_TYPE_HARD_WIRED: |
| udev->removable = USB_DEVICE_FIXED; |
| break; |
| default: /* use what was set above */ |
| break; |
| } |
| } |
| |
| /** |
| * usb_new_device - perform initial device setup (usbcore-internal) |
| * @udev: newly addressed device (in ADDRESS state) |
| * |
| * This is called with devices which have been detected but not fully |
| * enumerated. The device descriptor is available, but not descriptors |
| * for any device configuration. The caller must have locked either |
| * the parent hub (if udev is a normal device) or else the |
| * usb_bus_list_lock (if udev is a root hub). The parent's pointer to |
| * udev has already been installed, but udev is not yet visible through |
| * sysfs or other filesystem code. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| * |
| * Only the hub driver or root-hub registrar should ever call this. |
| * |
| * Return: Whether the device is configured properly or not. Zero if the |
| * interface was registered with the driver core; else a negative errno |
| * value. |
| * |
| */ |
| int usb_new_device(struct usb_device *udev) |
| { |
| int err; |
| |
| if (udev->parent) { |
| /* Initialize non-root-hub device wakeup to disabled; |
| * device (un)configuration controls wakeup capable |
| * sysfs power/wakeup controls wakeup enabled/disabled |
| */ |
| device_init_wakeup(&udev->dev, 0); |
| } |
| |
| /* Tell the runtime-PM framework the device is active */ |
| pm_runtime_set_active(&udev->dev); |
| pm_runtime_get_noresume(&udev->dev); |
| pm_runtime_use_autosuspend(&udev->dev); |
| pm_runtime_enable(&udev->dev); |
| |
| /* By default, forbid autosuspend for all devices. It will be |
| * allowed for hubs during binding. |
| */ |
| usb_disable_autosuspend(udev); |
| |
| err = usb_enumerate_device(udev); /* Read descriptors */ |
| if (err < 0) |
| goto fail; |
| dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
| udev->devnum, udev->bus->busnum, |
| (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); |
| /* export the usbdev device-node for libusb */ |
| udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, |
| (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); |
| |
| /* Tell the world! */ |
| announce_device(udev); |
| |
| if (udev->serial) |
| add_device_randomness(udev->serial, strlen(udev->serial)); |
| if (udev->product) |
| add_device_randomness(udev->product, strlen(udev->product)); |
| if (udev->manufacturer) |
| add_device_randomness(udev->manufacturer, |
| strlen(udev->manufacturer)); |
| |
| device_enable_async_suspend(&udev->dev); |
| |
| /* check whether the hub or firmware marks this port as non-removable */ |
| if (udev->parent) |
| set_usb_port_removable(udev); |
| |
| /* Register the device. The device driver is responsible |
| * for configuring the device and invoking the add-device |
| * notifier chain (used by usbfs and possibly others). |
| */ |
| err = device_add(&udev->dev); |
| if (err) { |
| dev_err(&udev->dev, "can't device_add, error %d\n", err); |
| goto fail; |
| } |
| |
| /* Create link files between child device and usb port device. */ |
| if (udev->parent) { |
| struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
| int port1 = udev->portnum; |
| struct usb_port *port_dev = hub->ports[port1 - 1]; |
| |
| err = sysfs_create_link(&udev->dev.kobj, |
| &port_dev->dev.kobj, "port"); |
| if (err) |
| goto fail; |
| |
| err = sysfs_create_link(&port_dev->dev.kobj, |
| &udev->dev.kobj, "device"); |
| if (err) { |
| sysfs_remove_link(&udev->dev.kobj, "port"); |
| goto fail; |
| } |
| |
| if (!test_and_set_bit(port1, hub->child_usage_bits)) |
| pm_runtime_get_sync(&port_dev->dev); |
| } |
| |
| (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
| usb_mark_last_busy(udev); |
| pm_runtime_put_sync_autosuspend(&udev->dev); |
| return err; |
| |
| fail: |
| usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
| pm_runtime_disable(&udev->dev); |
| pm_runtime_set_suspended(&udev->dev); |
| return err; |
| } |
| |
| |
| /** |
| * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
| * @usb_dev: USB device |
| * |
| * Move the USB device to a very basic state where interfaces are disabled |
| * and the device is in fact unconfigured and unusable. |
| * |
| * We share a lock (that we have) with device_del(), so we need to |
| * defer its call. |
| * |
| * Return: 0. |
| */ |
| int usb_deauthorize_device(struct usb_device *usb_dev) |
| { |
| usb_lock_device(usb_dev); |
| if (usb_dev->authorized == 0) |
| goto out_unauthorized; |
| |
| usb_dev->authorized = 0; |
| usb_set_configuration(usb_dev, -1); |
| |
| out_unauthorized: |
| usb_unlock_device(usb_dev); |
| return 0; |
| } |
| |
| |
| int usb_authorize_device(struct usb_device *usb_dev) |
| { |
| int result = 0, c; |
| |
| usb_lock_device(usb_dev); |
| if (usb_dev->authorized == 1) |
| goto out_authorized; |
| |
| result = usb_autoresume_device(usb_dev); |
| if (result < 0) { |
| dev_err(&usb_dev->dev, |
| "can't autoresume for authorization: %d\n", result); |
| goto error_autoresume; |
| } |
| result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); |
| if (result < 0) { |
| dev_err(&usb_dev->dev, "can't re-read device descriptor for " |
| "authorization: %d\n", result); |
| goto error_device_descriptor; |
| } |
| |
| usb_dev->authorized = 1; |
| /* Choose and set the configuration. This registers the interfaces |
| * with the driver core and lets interface drivers bind to them. |
| */ |
| c = usb_choose_configuration(usb_dev); |
| if (c >= 0) { |
| result = usb_set_configuration(usb_dev, c); |
| if (result) { |
| dev_err(&usb_dev->dev, |
| "can't set config #%d, error %d\n", c, result); |
| /* This need not be fatal. The user can try to |
| * set other configurations. */ |
| } |
| } |
| dev_info(&usb_dev->dev, "authorized to connect\n"); |
| |
| error_device_descriptor: |
| usb_autosuspend_device(usb_dev); |
| error_autoresume: |
| out_authorized: |
| usb_unlock_device(usb_dev); /* complements locktree */ |
| return result; |
| } |
| |
| |
| /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
| static unsigned hub_is_wusb(struct usb_hub *hub) |
| { |
| struct usb_hcd *hcd; |
| if (hub->hdev->parent != NULL) /* not a root hub? */ |
| return 0; |
| hcd = container_of(hub->hdev->bus, struct usb_hcd, self); |
| return hcd->wireless; |
| } |
| |
| |
| #define PORT_RESET_TRIES 5 |
| #define SET_ADDRESS_TRIES 2 |
| #define GET_DESCRIPTOR_TRIES 2 |
| #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) |
| #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) |
| |
| #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ |
| #define HUB_SHORT_RESET_TIME 10 |
| #define HUB_BH_RESET_TIME 50 |
| #define HUB_LONG_RESET_TIME 200 |
| #define HUB_RESET_TIMEOUT 800 |
| |
| /* |
| * "New scheme" enumeration causes an extra state transition to be |
| * exposed to an xhci host and causes USB3 devices to receive control |
| * commands in the default state. This has been seen to cause |
| * enumeration failures, so disable this enumeration scheme for USB3 |
| * devices. |
| */ |
| static bool use_new_scheme(struct usb_device *udev, int retry) |
| { |
| if (udev->speed == USB_SPEED_SUPER) |
| return false; |
| |
| return USE_NEW_SCHEME(retry); |
| } |
| |
| static int hub_port_reset(struct usb_hub *hub, int port1, |
| struct usb_device *udev, unsigned int delay, bool warm); |
| |
| /* Is a USB 3.0 port in the Inactive or Compliance Mode state? |
| * Port worm reset is required to recover |
| */ |
| static bool hub_port_warm_reset_required(struct usb_hub *hub, u16 portstatus) |
| { |
| return hub_is_superspeed(hub->hdev) && |
| (((portstatus & USB_PORT_STAT_LINK_STATE) == |
| USB_SS_PORT_LS_SS_INACTIVE) || |
| ((portstatus & USB_PORT_STAT_LINK_STATE) == |
| USB_SS_PORT_LS_COMP_MOD)) ; |
| } |
| |
| static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
| struct usb_device *udev, unsigned int delay, bool warm) |
| { |
| int delay_time, ret; |
| u16 portstatus; |
| u16 portchange; |
| |
| for (delay_time = 0; |
| delay_time < HUB_RESET_TIMEOUT; |
| delay_time += delay) { |
| /* wait to give the device a chance to reset */ |
| msleep(delay); |
| |
| /* read and decode port status */ |
| ret = hub_port_status(hub, port1, &portstatus, &portchange); |
| if (ret < 0) |
| return ret; |
| |
| /* The port state is unknown until the reset completes. */ |
| if (!(portstatus & USB_PORT_STAT_RESET)) |
| break; |
| |
| /* switch to the long delay after two short delay failures */ |
| if (delay_time >= 2 * HUB_SHORT_RESET_TIME) |
| delay = HUB_LONG_RESET_TIME; |
| |
| dev_dbg(&hub->ports[port1 - 1]->dev, |
| "not %sreset yet, waiting %dms\n", |
| warm ? "warm " : "", delay); |
| } |
| |
| if ((portstatus & USB_PORT_STAT_RESET)) |
| return -EBUSY; |
| |
| if (hub_port_warm_reset_required(hub, portstatus)) |
| return -ENOTCONN; |
| |
| /* Device went away? */ |
| if (!(portstatus & USB_PORT_STAT_CONNECTION)) |
| return -ENOTCONN; |
| |
| /* bomb out completely if the connection bounced. A USB 3.0 |
| * connection may bounce if multiple warm resets were issued, |
| * but the device may have successfully re-connected. Ignore it. |
| */ |
| if (!hub_is_superspeed(hub->hdev) && |
| (portchange & USB_PORT_STAT_C_CONNECTION)) |
| return -ENOTCONN; |
| |
| if (!(portstatus & USB_PORT_STAT_ENABLE)) |
| return -EBUSY; |
| |
| if (!udev) |
| return 0; |
| |
| if (hub_is_wusb(hub)) |
| udev->speed = USB_SPEED_WIRELESS; |
| else if (hub_is_superspeed(hub->hdev)) |
| udev->speed = USB_SPEED_SUPER; |
| else if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
| udev->speed = USB_SPEED_HIGH; |
| else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
| udev->speed = USB_SPEED_LOW; |
| else |
| udev->speed = USB_SPEED_FULL; |
| return 0; |
| } |
| |
| static void hub_port_finish_reset(struct usb_hub *hub, int port1, |
| struct usb_device *udev, int *status) |
| { |
| switch (*status) { |
| case 0: |
| /* TRSTRCY = 10 ms; plus some extra */ |
| msleep(10 + 40); |
| if (udev) { |
| struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| |
| update_devnum(udev, 0); |
| /* The xHC may think the device is already reset, |
| * so ignore the status. |
| */ |
| if (hcd->driver->reset_device) |
| hcd->driver->reset_device(hcd, udev); |
| } |
| /* FALL THROUGH */ |
| case -ENOTCONN: |
| case -ENODEV: |
| usb_clear_port_feature(hub->hdev, |
| port1, USB_PORT_FEAT_C_RESET); |
| if (hub_is_superspeed(hub->hdev)) { |
| usb_clear_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_C_BH_PORT_RESET); |
| usb_clear_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_C_PORT_LINK_STATE); |
| usb_clear_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_C_CONNECTION); |
| } |
| if (udev) |
| usb_set_device_state(udev, *status |
| ? USB_STATE_NOTATTACHED |
| : USB_STATE_DEFAULT); |
| break; |
| } |
| } |
| |
| /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ |
| static int hub_port_reset(struct usb_hub *hub, int port1, |
| struct usb_device *udev, unsigned int delay, bool warm) |
| { |
| int i, status; |
| u16 portchange, portstatus; |
| struct usb_port *port_dev = hub->ports[port1 - 1]; |
| |
| if (!hub_is_superspeed(hub->hdev)) { |
| if (warm) { |
| dev_err(hub->intfdev, "only USB3 hub support " |
| "warm reset\n"); |
| return -EINVAL; |
| } |
| /* Block EHCI CF initialization during the port reset. |
| * Some companion controllers don't like it when they mix. |
| */ |
| down_read(&ehci_cf_port_reset_rwsem); |
| } else if (!warm) { |
| /* |
| * If the caller hasn't explicitly requested a warm reset, |
| * double check and see if one is needed. |
| */ |
| status = hub_port_status(hub, port1, |
| &portstatus, &portchange); |
| if (status < 0) |
| goto done; |
| |
| if (hub_port_warm_reset_required(hub, portstatus)) |
| warm = true; |
| } |
| |
| /* Reset the port */ |
| for (i = 0; i < PORT_RESET_TRIES; i++) { |
| status = set_port_feature(hub->hdev, port1, (warm ? |
| USB_PORT_FEAT_BH_PORT_RESET : |
| USB_PORT_FEAT_RESET)); |
| if (status == -ENODEV) { |
| ; /* The hub is gone */ |
| } else if (status) { |
| dev_err(&port_dev->dev, |
| "cannot %sreset (err = %d)\n", |
| warm ? "warm " : "", status); |
| } else { |
| status = hub_port_wait_reset(hub, port1, udev, delay, |
| warm); |
| if (status && status != -ENOTCONN && status != -ENODEV) |
| dev_dbg(hub->intfdev, |
| "port_wait_reset: err = %d\n", |
| status); |
| } |
| |
| /* Check for disconnect or reset */ |
| if (status == 0 || status == -ENOTCONN || status == -ENODEV) { |
| hub_port_finish_reset(hub, port1, udev, &status); |
| |
| if (!hub_is_superspeed(hub->hdev)) |
| goto done; |
| |
| /* |
| * If a USB 3.0 device migrates from reset to an error |
| * state, re-issue the warm reset. |
| */ |
| if (hub_port_status(hub, port1, |
| &portstatus, &portchange) < 0) |
| goto done; |
| |
| if (!hub_port_warm_reset_required(hub, portstatus)) |
| goto done; |
| |
| /* |
| * If the port is in SS.Inactive or Compliance Mode, the |
| * hot or warm reset failed. Try another warm reset. |
| */ |
| if (!warm) { |
| dev_dbg(&port_dev->dev, |
| "hot reset failed, warm reset\n"); |
| warm = true; |
| } |
| } |
| |
| dev_dbg(&port_dev->dev, |
| "not enabled, trying %sreset again...\n", |
| warm ? "warm " : ""); |
| delay = HUB_LONG_RESET_TIME; |
| } |
| |
| dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n"); |
| |
| done: |
| if (!hub_is_superspeed(hub->hdev)) |
| up_read(&ehci_cf_port_reset_rwsem); |
| |
| return status; |
| } |
| |
| /* Check if a port is power on */ |
| static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) |
| { |
| int ret = 0; |
| |
| if (hub_is_superspeed(hub->hdev)) { |
| if (portstatus & USB_SS_PORT_STAT_POWER) |
| ret = 1; |
| } else { |
| if (portstatus & USB_PORT_STAT_POWER) |
| ret = 1; |
| } |
| |
| return ret; |
| } |
| |
| static void usb_lock_port(struct usb_port *port_dev) |
| __acquires(&port_dev->status_lock) |
| { |
| mutex_lock(&port_dev->status_lock); |
| __acquire(&port_dev->status_lock); |
| } |
| |
| static void usb_unlock_port(struct usb_port *port_dev) |
| __releases(&port_dev->status_lock) |
| { |
| mutex_unlock(&port_dev->status_lock); |
| __release(&port_dev->status_lock); |
| } |
| |
| #ifdef CONFIG_PM |
| |
| /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ |
| static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) |
| { |
| int ret = 0; |
| |
| if (hub_is_superspeed(hub->hdev)) { |
| if ((portstatus & USB_PORT_STAT_LINK_STATE) |
| == USB_SS_PORT_LS_U3) |
| ret = 1; |
| } else { |
| if (portstatus & USB_PORT_STAT_SUSPEND) |
| ret = 1; |
| } |
| |
| return ret; |
| } |
| |
| /* Determine whether the device on a port is ready for a normal resume, |
| * is ready for a reset-resume, or should be disconnected. |
| */ |
| static int check_port_resume_type(struct usb_device *udev, |
| struct usb_hub *hub, int port1, |
| int status, unsigned portchange, unsigned portstatus) |
| { |
| struct usb_port *port_dev = hub->ports[port1 - 1]; |
| |
| /* Is the device still present? */ |
| if (status || port_is_suspended(hub, portstatus) || |
| !port_is_power_on(hub, portstatus) || |
| !(portstatus & USB_PORT_STAT_CONNECTION)) { |
| if (status >= 0) |
| status = -ENODEV; |
| } |
| |
| /* Can't do a normal resume if the port isn't enabled, |
| * so try a reset-resume instead. |
| */ |
| else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { |
| if (udev->persist_enabled) |
| udev->reset_resume = 1; |
| else |
| status = -ENODEV; |
| } |
| |
| if (status) { |
| dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n", |
| portchange, portstatus, status); |
| } else if (udev->reset_resume) { |
| |
| /* Late port handoff can set status-change bits */ |
| if (portchange & USB_PORT_STAT_C_CONNECTION) |
| usb_clear_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_C_CONNECTION); |
| if (portchange & USB_PORT_STAT_C_ENABLE) |
| usb_clear_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_C_ENABLE); |
| } |
| |
| return status; |
| } |
| |
| int usb_disable_ltm(struct usb_device *udev) |
| { |
| struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| |
| /* Check if the roothub and device supports LTM. */ |
| if (!usb_device_supports_ltm(hcd->self.root_hub) || |
| !usb_device_supports_ltm(udev)) |
| return 0; |
| |
| /* Clear Feature LTM Enable can only be sent if the device is |
| * configured. |
| */ |
| if (!udev->actconfig) |
| return 0; |
| |
| return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, |
| USB_DEVICE_LTM_ENABLE, 0, NULL, 0, |
| USB_CTRL_SET_TIMEOUT); |
| } |
| EXPORT_SYMBOL_GPL(usb_disable_ltm); |
| |
| void usb_enable_ltm(struct usb_device *udev) |
| { |
| struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| |
| /* Check if the roothub and device supports LTM. */ |
| if (!usb_device_supports_ltm(hcd->self.root_hub) || |
| !usb_device_supports_ltm(udev)) |
| return; |
| |
| /* Set Feature LTM Enable can only be sent if the device is |
| * configured. |
| */ |
| if (!udev->actconfig) |
| return; |
| |
| usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, |
| USB_DEVICE_LTM_ENABLE, 0, NULL, 0, |
| USB_CTRL_SET_TIMEOUT); |
| } |
| EXPORT_SYMBOL_GPL(usb_enable_ltm); |
| |
| /* |
| * usb_enable_remote_wakeup - enable remote wakeup for a device |
| * @udev: target device |
| * |
| * For USB-2 devices: Set the device's remote wakeup feature. |
| * |
| * For USB-3 devices: Assume there's only one function on the device and |
| * enable remote wake for the first interface. FIXME if the interface |
| * association descriptor shows there's more than one function. |
| */ |
| static int usb_enable_remote_wakeup(struct usb_device *udev) |
| { |
| if (udev->speed < USB_SPEED_SUPER) |
| return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, |
| USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, |
| USB_CTRL_SET_TIMEOUT); |
| else |
| return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, |
| USB_INTRF_FUNC_SUSPEND, |
| USB_INTRF_FUNC_SUSPEND_RW | |
| USB_INTRF_FUNC_SUSPEND_LP, |
| NULL, 0, USB_CTRL_SET_TIMEOUT); |
| } |
| |
| /* |
| * usb_disable_remote_wakeup - disable remote wakeup for a device |
| * @udev: target device |
| * |
| * For USB-2 devices: Clear the device's remote wakeup feature. |
| * |
| * For USB-3 devices: Assume there's only one function on the device and |
| * disable remote wake for the first interface. FIXME if the interface |
| * association descriptor shows there's more than one function. |
| */ |
| static int usb_disable_remote_wakeup(struct usb_device *udev) |
| { |
| if (udev->speed < USB_SPEED_SUPER) |
| return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, |
| USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, |
| USB_CTRL_SET_TIMEOUT); |
| else |
| return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, |
| USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, |
| USB_CTRL_SET_TIMEOUT); |
| } |
| |
| /* Count of wakeup-enabled devices at or below udev */ |
| static unsigned wakeup_enabled_descendants(struct usb_device *udev) |
| { |
| struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
| |
| return udev->do_remote_wakeup + |
| (hub ? hub->wakeup_enabled_descendants : 0); |
| } |
| |
| /* |
| * usb_port_suspend - suspend a usb device's upstream port |
| * @udev: device that's no longer in active use, not a root hub |
| * Context: must be able to sleep; device not locked; pm locks held |
| * |
| * Suspends a USB device that isn't in active use, conserving power. |
| * Devices may wake out of a suspend, if anything important happens, |
| * using the remote wakeup mechanism. They may also be taken out of |
| * suspend by the host, using usb_port_resume(). It's also routine |
| * to disconnect devices while they are suspended. |
| * |
| * This only affects the USB hardware for a device; its interfaces |
| * (and, for hubs, child devices) must already have been suspended. |
| * |
| * Selective port suspend reduces power; most suspended devices draw |
| * less than 500 uA. It's also used in OTG, along with remote wakeup. |
| * All devices below the suspended port are also suspended. |
| * |
| * Devices leave suspend state when the host wakes them up. Some devices |
| * also support "remote wakeup", where the device can activate the USB |
| * tree above them to deliver data, such as a keypress or packet. In |
| * some cases, this wakes the USB host. |
| * |
| * Suspending OTG devices may trigger HNP, if that's been enabled |
| * between a pair of dual-role devices. That will change roles, such |
| * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. |
| * |
| * Devices on USB hub ports have only one "suspend" state, corresponding |
| * to ACPI D2, "may cause the device to lose some context". |
| * State transitions include: |
| * |
| * - suspend, resume ... when the VBUS power link stays live |
| * - suspend, disconnect ... VBUS lost |
| * |
| * Once VBUS drop breaks the circuit, the port it's using has to go through |
| * normal re-enumeration procedures, starting with enabling VBUS power. |
| * Other than re-initializing the hub (plug/unplug, except for root hubs), |
| * Linux (2.6) currently has NO mechanisms to initiate that: no khubd |
| * timer, no SRP, no requests through sysfs. |
| * |
| * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get |
| * suspended until their bus goes into global suspend (i.e., the root |
| * hub is suspended). Nevertheless, we change @udev->state to |
| * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual |
| * upstream port setting is stored in @udev->port_is_suspended. |
| * |
| * Returns 0 on success, else negative errno. |
| */ |
| int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
| { |
| struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
| struct usb_port *port_dev = hub->ports[udev->portnum - 1]; |
| int port1 = udev->portnum; |
| int status; |
| bool really_suspend = true; |
| |
| usb_lock_port(port_dev); |
| |
| /* enable remote wakeup when appropriate; this lets the device |
| * wake up the upstream hub (including maybe the root hub). |
| * |
| * NOTE: OTG devices may issue remote wakeup (or SRP) even when |
| * we don't explicitly enable it here. |
| */ |
| if (udev->do_remote_wakeup) { |
| status = usb_enable_remote_wakeup(udev); |
| if (status) { |
| dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
| status); |
| /* bail if autosuspend is requested */ |
| if (PMSG_IS_AUTO(msg)) |
| goto err_wakeup; |
| } |
| } |
| |
| /* disable USB2 hardware LPM */ |
| if (udev->usb2_hw_lpm_enabled == 1) |
| usb_set_usb2_hardware_lpm(udev, 0); |
| |
| if (usb_disable_ltm(udev)) { |
| dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); |
| status = -ENOMEM; |
| if (PMSG_IS_AUTO(msg)) |
| goto err_ltm; |
| } |
| if (usb_unlocked_disable_lpm(udev)) { |
| dev_err(&udev->dev, "Failed to disable LPM before suspend\n."); |
| status = -ENOMEM; |
| if (PMSG_IS_AUTO(msg)) |
| goto err_lpm3; |
| } |
| |
| /* see 7.1.7.6 */ |
| if (hub_is_superspeed(hub->hdev)) |
| status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); |
| |
| /* |
| * For system suspend, we do not need to enable the suspend feature |
| * on individual USB-2 ports. The devices will automatically go |
| * into suspend a few ms after the root hub stops sending packets. |
| * The USB 2.0 spec calls this "global suspend". |
| * |
| * However, many USB hubs have a bug: They don't relay wakeup requests |
| * from a downstream port if the port's suspend feature isn't on. |
| * Therefore we will turn on the suspend feature if udev or any of its |
| * descendants is enabled for remote wakeup. |
| */ |
| else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) |
| status = set_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_SUSPEND); |
| else { |
| really_suspend = false; |
| status = 0; |
| } |
| if (status) { |
| dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status); |
| |
| /* Try to enable USB3 LPM and LTM again */ |
| usb_unlocked_enable_lpm(udev); |
| err_lpm3: |
| usb_enable_ltm(udev); |
| err_ltm: |
| /* Try to enable USB2 hardware LPM again */ |
| if (udev->usb2_hw_lpm_capable == 1) |
| usb_set_usb2_hardware_lpm(udev, 1); |
| |
| if (udev->do_remote_wakeup) |
| (void) usb_disable_remote_wakeup(udev); |
| err_wakeup: |
| |
| /* System sleep transitions should never fail */ |
| if (!PMSG_IS_AUTO(msg)) |
| status = 0; |
| } else { |
| dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", |
| (PMSG_IS_AUTO(msg) ? "auto-" : ""), |
| udev->do_remote_wakeup); |
| if (really_suspend) { |
| udev->port_is_suspended = 1; |
| |
| /* device has up to 10 msec to fully suspend */ |
| msleep(10); |
| } |
| usb_set_device_state(udev, USB_STATE_SUSPENDED); |
| } |
| |
| if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled |
| && test_and_clear_bit(port1, hub->child_usage_bits)) |
| pm_runtime_put_sync(&port_dev->dev); |
| |
| usb_mark_last_busy(hub->hdev); |
| |
| usb_unlock_port(port_dev); |
| return status; |
| } |
| |
| /* |
| * If the USB "suspend" state is in use (rather than "global suspend"), |
| * many devices will be individually taken out of suspend state using |
| * special "resume" signaling. This routine kicks in shortly after |
| * hardware resume signaling is finished, either because of selective |
| * resume (by host) or remote wakeup (by device) ... now see what changed |
| * in the tree that's rooted at this device. |
| * |
| * If @udev->reset_resume is set then the device is reset before the |
| * status check is done. |
| */ |
| static int finish_port_resume(struct usb_device *udev) |
| { |
| int status = 0; |
| u16 devstatus = 0; |
| |
| /* caller owns the udev device lock */ |
| dev_dbg(&udev->dev, "%s\n", |
| udev->reset_resume ? "finish reset-resume" : "finish resume"); |
| |
| /* usb ch9 identifies four variants of SUSPENDED, based on what |
| * state the device resumes to. Linux currently won't see the |
| * first two on the host side; they'd be inside hub_port_init() |
| * during many timeouts, but khubd can't suspend until later. |
| */ |
| usb_set_device_state(udev, udev->actconfig |
| ? USB_STATE_CONFIGURED |
| : USB_STATE_ADDRESS); |
| |
| /* 10.5.4.5 says not to reset a suspended port if the attached |
| * device is enabled for remote wakeup. Hence the reset |
| * operation is carried out here, after the port has been |
| * resumed. |
| */ |
| if (udev->reset_resume) { |
| /* |
| * If the device morphs or switches modes when it is reset, |
| * we don't want to perform a reset-resume. We'll fail the |
| * resume, which will cause a logical disconnect, and then |
| * the device will be rediscovered. |
| */ |
| retry_reset_resume: |
| if (udev->quirks & USB_QUIRK_RESET) |
| status = -ENODEV; |
| else |
| status = usb_reset_and_verify_device(udev); |
| } |
| |
| /* 10.5.4.5 says be sure devices in the tree are still there. |
| * For now let's assume the device didn't go crazy on resume, |
| * and device drivers will know about any resume quirks. |
| */ |
| if (status == 0) { |
| devstatus = 0; |
| status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
| |
| /* If a normal resume failed, try doing a reset-resume */ |
| if (status && !udev->reset_resume && udev->persist_enabled) { |
| dev_dbg(&udev->dev, "retry with reset-resume\n"); |
| udev->reset_resume = 1; |
| goto retry_reset_resume; |
| } |
| } |
| |
| if (status) { |
| dev_dbg(&udev->dev, "gone after usb resume? status %d\n", |
| status); |
| /* |
| * There are a few quirky devices which violate the standard |
| * by claiming to have remote wakeup enabled after a reset, |
| * which crash if the feature is cleared, hence check for |
| * udev->reset_resume |
| */ |
| } else if (udev->actconfig && !udev->reset_resume) { |
| if (udev->speed < USB_SPEED_SUPER) { |
| if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) |
| status = usb_disable_remote_wakeup(udev); |
| } else { |
| status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, |
| &devstatus); |
| if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP |
| | USB_INTRF_STAT_FUNC_RW)) |
| status = usb_disable_remote_wakeup(udev); |
| } |
| |
| if (status) |
| dev_dbg(&udev->dev, |
| "disable remote wakeup, status %d\n", |
| status); |
| status = 0; |
| } |
| return status; |
| } |
| |
| /* |
| * usb_port_resume - re-activate a suspended usb device's upstream port |
| * @udev: device to re-activate, not a root hub |
| * Context: must be able to sleep; device not locked; pm locks held |
| * |
| * This will re-activate the suspended device, increasing power usage |
| * while letting drivers communicate again with its endpoints. |
| * USB resume explicitly guarantees that the power session between |
| * the host and the device is the same as it was when the device |
| * suspended. |
| * |
| * If @udev->reset_resume is set then this routine won't check that the |
| * port is still enabled. Furthermore, finish_port_resume() above will |
| * reset @udev. The end result is that a broken power session can be |
| * recovered and @udev will appear to persist across a loss of VBUS power. |
| * |
| * For example, if a host controller doesn't maintain VBUS suspend current |
| * during a system sleep or is reset when the system wakes up, all the USB |
| * power sessions below it will be broken. This is especially troublesome |
| * for mass-storage devices containing mounted filesystems, since the |
| * device will appear to have disconnected and all the memory mappings |
| * to it will be lost. Using the USB_PERSIST facility, the device can be |
| * made to appear as if it had not disconnected. |
| * |
| * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
| * every effort to insure that the same device is present after the |
| * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
| * quite possible for a device to remain unaltered but its media to be |
| * changed. If the user replaces a flash memory card while the system is |
| * asleep, he will have only himself to blame when the filesystem on the |
| * new card is corrupted and the system crashes. |
| * |
| * Returns 0 on success, else negative errno. |
| */ |
| int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
| { |
| struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
| struct usb_port *port_dev = hub->ports[udev->portnum - 1]; |
| int port1 = udev->portnum; |
| int status; |
| u16 portchange, portstatus; |
| |
| if (!test_and_set_bit(port1, hub->child_usage_bits)) { |
| status = pm_runtime_get_sync(&port_dev->dev); |
| if (status < 0) { |
| dev_dbg(&udev->dev, "can't resume usb port, status %d\n", |
| status); |
| return status; |
| } |
| } |
| |
| usb_lock_port(port_dev); |
| |
| /* Skip the initial Clear-Suspend step for a remote wakeup */ |
| status = hub_port_status(hub, port1, &portstatus, &portchange); |
| if (status == 0 && !port_is_suspended(hub, portstatus)) |
| goto SuspendCleared; |
| |
| /* see 7.1.7.7; affects power usage, but not budgeting */ |
| if (hub_is_superspeed(hub->hdev)) |
| status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); |
| else |
| status = usb_clear_port_feature(hub->hdev, |
| port1, USB_PORT_FEAT_SUSPEND); |
| if (status) { |
| dev_dbg(&port_dev->dev, "can't resume, status %d\n", status); |
| } else { |
| /* drive resume for at least 20 msec */ |
| dev_dbg(&udev->dev, "usb %sresume\n", |
| (PMSG_IS_AUTO(msg) ? "auto-" : "")); |
| msleep(25); |
| |
| /* Virtual root hubs can trigger on GET_PORT_STATUS to |
| * stop resume signaling. Then finish the resume |
| * sequence. |
| */ |
| status = hub_port_status(hub, port1, &portstatus, &portchange); |
| |
| /* TRSMRCY = 10 msec */ |
| msleep(10); |
| } |
| |
| SuspendCleared: |
| if (status == 0) { |
| udev->port_is_suspended = 0; |
| if (hub_is_superspeed(hub->hdev)) { |
| if (portchange & USB_PORT_STAT_C_LINK_STATE) |
| usb_clear_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_C_PORT_LINK_STATE); |
| } else { |
| if (portchange & USB_PORT_STAT_C_SUSPEND) |
| usb_clear_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_C_SUSPEND); |
| } |
| } |
| |
| status = check_port_resume_type(udev, |
| hub, port1, status, portchange, portstatus); |
| if (status == 0) |
| status = finish_port_resume(udev); |
| if (status < 0) { |
| dev_dbg(&udev->dev, "can't resume, status %d\n", status); |
| hub_port_logical_disconnect(hub, port1); |
| } else { |
| /* Try to enable USB2 hardware LPM */ |
| if (udev->usb2_hw_lpm_capable == 1) |
| usb_set_usb2_hardware_lpm(udev, 1); |
| |
| /* Try to enable USB3 LTM and LPM */ |
| usb_enable_ltm(udev); |
| usb_unlocked_enable_lpm(udev); |
| } |
| |
| usb_unlock_port(port_dev); |
| |
| return status; |
| } |
| |
| #ifdef CONFIG_PM_RUNTIME |
| |
| int usb_remote_wakeup(struct usb_device *udev) |
| { |
| int status = 0; |
| |
| usb_lock_device(udev); |
| if (udev->state == USB_STATE_SUSPENDED) { |
| dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
| status = usb_autoresume_device(udev); |
| if (status == 0) { |
| /* Let the drivers do their thing, then... */ |
| usb_autosuspend_device(udev); |
| } |
| } |
| usb_unlock_device(udev); |
| return status; |
| } |
| |
| /* Returns 1 if there was a remote wakeup and a connect status change. */ |
| static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, |
| u16 portstatus, u16 portchange) |
| __must_hold(&port_dev->status_lock) |
| { |
| struct usb_port *port_dev = hub->ports[port - 1]; |
| struct usb_device *hdev; |
| struct usb_device *udev; |
| int connect_change = 0; |
| int ret; |
| |
| hdev = hub->hdev; |
| udev = port_dev->child; |
| if (!hub_is_superspeed(hdev)) { |
| if (!(portchange & USB_PORT_STAT_C_SUSPEND)) |
| return 0; |
| usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); |
| } else { |
| if (!udev || udev->state != USB_STATE_SUSPENDED || |
| (portstatus & USB_PORT_STAT_LINK_STATE) != |
| USB_SS_PORT_LS_U0) |
| return 0; |
| } |
| |
| if (udev) { |
| /* TRSMRCY = 10 msec */ |
| msleep(10); |
| |
| usb_unlock_port(port_dev); |
| ret = usb_remote_wakeup(udev); |
| usb_lock_port(port_dev); |
| if (ret < 0) |
| connect_change = 1; |
| } else { |
| ret = -ENODEV; |
| hub_port_disable(hub, port, 1); |
| } |
| dev_dbg(&port_dev->dev, "resume, status %d\n", ret); |
| return connect_change; |
| } |
| |
| #else |
| |
| static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, |
| u16 portstatus, u16 portchange) |
| { |
| return 0; |
| } |
| |
| #endif |
| |
| static int check_ports_changed(struct usb_hub *hub) |
| { |
| int port1; |
| |
| for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { |
| u16 portstatus, portchange; |
| int status; |
| |
| status = hub_port_status(hub, port1, &portstatus, &portchange); |
| if (!status && portchange) |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
| { |
| struct usb_hub *hub = usb_get_intfdata (intf); |
| struct usb_device *hdev = hub->hdev; |
| unsigned port1; |
| int status; |
| |
| /* |
| * Warn if children aren't already suspended. |
| * Also, add up the number of wakeup-enabled descendants. |
| */ |
| hub->wakeup_enabled_descendants = 0; |
| for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
| struct usb_port *port_dev = hub->ports[port1 - 1]; |
| struct usb_device *udev = port_dev->child; |
| |
| if (udev && udev->can_submit) { |
| dev_warn(&port_dev->dev, "not suspended yet\n"); |
| if (PMSG_IS_AUTO(msg)) |
| return -EBUSY; |
| } |
| if (udev) |
| hub->wakeup_enabled_descendants += |
| wakeup_enabled_descendants(udev); |
| } |
| |
| if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { |
| /* check if there are changes pending on hub ports */ |
| if (check_ports_changed(hub)) { |
| if (PMSG_IS_AUTO(msg)) |
| return -EBUSY; |
| pm_wakeup_event(&hdev->dev, 2000); |
| } |
| } |
| |
| if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { |
| /* Enable hub to send remote wakeup for all ports. */ |
| for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
| status = set_port_feature(hdev, |
| port1 | |
| USB_PORT_FEAT_REMOTE_WAKE_CONNECT | |
| USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | |
| USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, |
| USB_PORT_FEAT_REMOTE_WAKE_MASK); |
| } |
| } |
| |
| dev_dbg(&intf->dev, "%s\n", __func__); |
| |
| /* stop khubd and related activity */ |
| hub_quiesce(hub, HUB_SUSPEND); |
| return 0; |
| } |
| |
| static int hub_resume(struct usb_interface *intf) |
| { |
| struct usb_hub *hub = usb_get_intfdata(intf); |
| |
| dev_dbg(&intf->dev, "%s\n", __func__); |
| hub_activate(hub, HUB_RESUME); |
| return 0; |
| } |
| |
| static int hub_reset_resume(struct usb_interface *intf) |
| { |
| struct usb_hub *hub = usb_get_intfdata(intf); |
| |
| dev_dbg(&intf->dev, "%s\n", __func__); |
| hub_activate(hub, HUB_RESET_RESUME); |
| return 0; |
| } |
| |
| /** |
| * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power |
| * @rhdev: struct usb_device for the root hub |
| * |
| * The USB host controller driver calls this function when its root hub |
| * is resumed and Vbus power has been interrupted or the controller |
| * has been reset. The routine marks @rhdev as having lost power. |
| * When the hub driver is resumed it will take notice and carry out |
| * power-session recovery for all the "USB-PERSIST"-enabled child devices; |
| * the others will be disconnected. |
| */ |
| void usb_root_hub_lost_power(struct usb_device *rhdev) |
| { |
| dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); |
| rhdev->reset_resume = 1; |
| } |
| EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); |
| |
| static const char * const usb3_lpm_names[] = { |
| "U0", |
| "U1", |
| "U2", |
| "U3", |
| }; |
| |
| /* |
| * Send a Set SEL control transfer to the device, prior to enabling |
| * device-initiated U1 or U2. This lets the device know the exit latencies from |
| * the time the device initiates a U1 or U2 exit, to the time it will receive a |
| * packet from the host. |
| * |
| * This function will fail if the SEL or PEL values for udev are greater than |
| * the maximum allowed values for the link state to be enabled. |
| */ |
| static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) |
| { |
| struct usb_set_sel_req *sel_values; |
| unsigned long long u1_sel; |
| unsigned long long u1_pel; |
| unsigned long long u2_sel; |
| unsigned long long u2_pel; |
| int ret; |
| |
| if (udev->state != USB_STATE_CONFIGURED) |
| return 0; |
| |
| /* Convert SEL and PEL stored in ns to us */ |
| u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); |
| u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); |
| u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); |
| u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); |
| |
| /* |
| * Make sure that the calculated SEL and PEL values for the link |
| * state we're enabling aren't bigger than the max SEL/PEL |
| * value that will fit in the SET SEL control transfer. |
| * Otherwise the device would get an incorrect idea of the exit |
| * latency for the link state, and could start a device-initiated |
| * U1/U2 when the exit latencies are too high. |
| */ |
| if ((state == USB3_LPM_U1 && |
| (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || |
| u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || |
| (state == USB3_LPM_U2 && |
| (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || |
| u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { |
| dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", |
| usb3_lpm_names[state], u1_sel, u1_pel); |
| return -EINVAL; |
| } |
| |
| /* |
| * If we're enabling device-initiated LPM for one link state, |
| * but the other link state has a too high SEL or PEL value, |
| * just set those values to the max in the Set SEL request. |
| */ |
| if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) |
| u1_sel = USB3_LPM_MAX_U1_SEL_PEL; |
| |
| if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) |
| u1_pel = USB3_LPM_MAX_U1_SEL_PEL; |
| |
| if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) |
| u2_sel = USB3_LPM_MAX_U2_SEL_PEL; |
| |
| if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) |
| u2_pel = USB3_LPM_MAX_U2_SEL_PEL; |
| |
| /* |
| * usb_enable_lpm() can be called as part of a failed device reset, |
| * which may be initiated by an error path of a mass storage driver. |
| * Therefore, use GFP_NOIO. |
| */ |
| sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); |
| if (!sel_values) |
| return -ENOMEM; |
| |
| sel_values->u1_sel = u1_sel; |
| sel_values->u1_pel = u1_pel; |
| sel_values->u2_sel = cpu_to_le16(u2_sel); |
| sel_values->u2_pel = cpu_to_le16(u2_pel); |
| |
| ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| USB_REQ_SET_SEL, |
| USB_RECIP_DEVICE, |
| 0, 0, |
| sel_values, sizeof *(sel_values), |
| USB_CTRL_SET_TIMEOUT); |
| kfree(sel_values); |
| return ret; |
| } |
| |
| /* |
| * Enable or disable device-initiated U1 or U2 transitions. |
| */ |
| static int usb_set_device_initiated_lpm(struct usb_device *udev, |
| enum usb3_link_state state, bool enable) |
| { |
| int ret; |
| int feature; |
| |
| switch (state) { |
| case USB3_LPM_U1: |
| feature = USB_DEVICE_U1_ENABLE; |
| break; |
| case USB3_LPM_U2: |
| feature = USB_DEVICE_U2_ENABLE; |
| break; |
| default: |
| dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", |
| __func__, enable ? "enable" : "disable"); |
| return -EINVAL; |
| } |
| |
| if (udev->state != USB_STATE_CONFIGURED) { |
| dev_dbg(&udev->dev, "%s: Can't %s %s state " |
| "for unconfigured device.\n", |
| __func__, enable ? "enable" : "disable", |
| usb3_lpm_names[state]); |
| return 0; |
| } |
| |
| if (enable) { |
| /* |
| * Now send the control transfer to enable device-initiated LPM |
| * for either U1 or U2. |
| */ |
| ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| USB_REQ_SET_FEATURE, |
| USB_RECIP_DEVICE, |
| feature, |
| 0, NULL, 0, |
| USB_CTRL_SET_TIMEOUT); |
| } else { |
| ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| USB_REQ_CLEAR_FEATURE, |
| USB_RECIP_DEVICE, |
| feature, |
| 0, NULL, 0, |
| USB_CTRL_SET_TIMEOUT); |
| } |
| if (ret < 0) { |
| dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", |
| enable ? "Enable" : "Disable", |
| usb3_lpm_names[state]); |
| return -EBUSY; |
| } |
| return 0; |
| } |
| |
| static int usb_set_lpm_timeout(struct usb_device *udev, |
| enum usb3_link_state state, int timeout) |
| { |
| int ret; |
| int feature; |
| |
| switch (state) { |
| case USB3_LPM_U1: |
| feature = USB_PORT_FEAT_U1_TIMEOUT; |
| break; |
| case USB3_LPM_U2: |
| feature = USB_PORT_FEAT_U2_TIMEOUT; |
| break; |
| default: |
| dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", |
| __func__); |
| return -EINVAL; |
| } |
| |
| if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && |
| timeout != USB3_LPM_DEVICE_INITIATED) { |
| dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " |
| "which is a reserved value.\n", |
| usb3_lpm_names[state], timeout); |
| return -EINVAL; |
| } |
| |
| ret = set_port_feature(udev->parent, |
| USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, |
| feature); |
| if (ret < 0) { |
| dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," |
| "error code %i\n", usb3_lpm_names[state], |
| timeout, ret); |
| return -EBUSY; |
| } |
| if (state == USB3_LPM_U1) |
| udev->u1_params.timeout = timeout; |
| else |
| udev->u2_params.timeout = timeout; |
| return 0; |
| } |
| |
| /* |
| * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated |
| * U1/U2 entry. |
| * |
| * We will attempt to enable U1 or U2, but there are no guarantees that the |
| * control transfers to set the hub timeout or enable device-initiated U1/U2 |
| * will be successful. |
| * |
| * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI |
| * driver know about it. If that call fails, it should be harmless, and just |
| * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. |
| */ |
| static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, |
| enum usb3_link_state state) |
| { |
| int timeout, ret; |
| __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; |
| __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; |
| |
| /* If the device says it doesn't have *any* exit latency to come out of |
| * U1 or U2, it's probably lying. Assume it doesn't implement that link |
| * state. |
| */ |
| if ((state == USB3_LPM_U1 && u1_mel == 0) || |
| (state == USB3_LPM_U2 && u2_mel == 0)) |
| return; |
| |
| /* |
| * First, let the device know about the exit latencies |
| * associated with the link state we're about to enable. |
| */ |
| ret = usb_req_set_sel(udev, state); |
| if (ret < 0) { |
| dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", |
| usb3_lpm_names[state]); |
| return; |
| } |
| |
| /* We allow the host controller to set the U1/U2 timeout internally |
| * first, so that it can change its schedule to account for the |
| * additional latency to send data to a device in a lower power |
| * link state. |
| */ |
| timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); |
| |
| /* xHCI host controller doesn't want to enable this LPM state. */ |
| if (timeout == 0) |
| return; |
| |
| if (timeout < 0) { |
| dev_warn(&udev->dev, "Could not enable %s link state, " |
| "xHCI error %i.\n", usb3_lpm_names[state], |
| timeout); |
| return; |
| } |
| |
| if (usb_set_lpm_timeout(udev, state, timeout)) |
| /* If we can't set the parent hub U1/U2 timeout, |
| * device-initiated LPM won't be allowed either, so let the xHCI |
| * host know that this link state won't be enabled. |
| */ |
| hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); |
| |
| /* Only a configured device will accept the Set Feature U1/U2_ENABLE */ |
| else if (udev->actconfig) |
| usb_set_device_initiated_lpm(udev, state, true); |
| |
| } |
| |
| /* |
| * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated |
| * U1/U2 entry. |
| * |
| * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. |
| * If zero is returned, the parent will not allow the link to go into U1/U2. |
| * |
| * If zero is returned, device-initiated U1/U2 entry may still be enabled, but |
| * it won't have an effect on the bus link state because the parent hub will |
| * still disallow device-initiated U1/U2 entry. |
| * |
| * If zero is returned, the xHCI host controller may still think U1/U2 entry is |
| * possible. The result will be slightly more bus bandwidth will be taken up |
| * (to account for U1/U2 exit latency), but it should be harmless. |
| */ |
| static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, |
| enum usb3_link_state state) |
| { |
| int feature; |
| |
| switch (state) { |
| case USB3_LPM_U1: |
| feature = USB_PORT_FEAT_U1_TIMEOUT; |
| break; |
| case USB3_LPM_U2: |
| feature = USB_PORT_FEAT_U2_TIMEOUT; |
| break; |
| default: |
| dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", |
| __func__); |
| return -EINVAL; |
| } |
| |
| if (usb_set_lpm_timeout(udev, state, 0)) |
| return -EBUSY; |
| |
| usb_set_device_initiated_lpm(udev, state, false); |
| |
| if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) |
| dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " |
| "bus schedule bandwidth may be impacted.\n", |
| usb3_lpm_names[state]); |
| return 0; |
| } |
| |
| /* |
| * Disable hub-initiated and device-initiated U1 and U2 entry. |
| * Caller must own the bandwidth_mutex. |
| * |
| * This will call usb_enable_lpm() on failure, which will decrement |
| * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. |
| */ |
| int usb_disable_lpm(struct usb_device *udev) |
| { |
| struct usb_hcd *hcd; |
| |
| if (!udev || !udev->parent || |
| udev->speed != USB_SPEED_SUPER || |
| !udev->lpm_capable) |
| return 0; |
| |
| hcd = bus_to_hcd(udev->bus); |
| if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) |
| return 0; |
| |
| udev->lpm_disable_count++; |
| if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) |
| return 0; |
| |
| /* If LPM is enabled, attempt to disable it. */ |
| if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) |
| goto enable_lpm; |
| if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) |
| goto enable_lpm; |
| |
| return 0; |
| |
| enable_lpm: |
| usb_enable_lpm(udev); |
| return -EBUSY; |
| } |
| EXPORT_SYMBOL_GPL(usb_disable_lpm); |
| |
| /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ |
| int usb_unlocked_disable_lpm(struct usb_device *udev) |
| { |
| struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| int ret; |
| |
| if (!hcd) |
| return -EINVAL; |
| |
| mutex_lock(hcd->bandwidth_mutex); |
| ret = usb_disable_lpm(udev); |
| mutex_unlock(hcd->bandwidth_mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); |
| |
| /* |
| * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The |
| * xHCI host policy may prevent U1 or U2 from being enabled. |
| * |
| * Other callers may have disabled link PM, so U1 and U2 entry will be disabled |
| * until the lpm_disable_count drops to zero. Caller must own the |
| * bandwidth_mutex. |
| */ |
| void usb_enable_lpm(struct usb_device *udev) |
| { |
| struct usb_hcd *hcd; |
| |
| if (!udev || !udev->parent || |
| udev->speed != USB_SPEED_SUPER || |
| !udev->lpm_capable) |
| return; |
| |
| udev->lpm_disable_count--; |
| hcd = bus_to_hcd(udev->bus); |
| /* Double check that we can both enable and disable LPM. |
| * Device must be configured to accept set feature U1/U2 timeout. |
| */ |
| if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || |
| !hcd->driver->disable_usb3_lpm_timeout) |
| return; |
| |
| if (udev->lpm_disable_count > 0) |
| return; |
| |
| usb_enable_link_state(hcd, udev, USB3_LPM_U1); |
| usb_enable_link_state(hcd, udev, USB3_LPM_U2); |
| } |
| EXPORT_SYMBOL_GPL(usb_enable_lpm); |
| |
| /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ |
| void usb_unlocked_enable_lpm(struct usb_device *udev) |
| { |
| struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| |
| if (!hcd) |
| return; |
| |
| mutex_lock(hcd->bandwidth_mutex); |
| usb_enable_lpm(udev); |
| mutex_unlock(hcd->bandwidth_mutex); |
| } |
| EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); |
| |
| |
| #else /* CONFIG_PM */ |
| |
| #define hub_suspend NULL |
| #define hub_resume NULL |
| #define hub_reset_resume NULL |
| |
| int usb_disable_lpm(struct usb_device *udev) |
| { |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(usb_disable_lpm); |
| |
| void usb_enable_lpm(struct usb_device *udev) { } |
| EXPORT_SYMBOL_GPL(usb_enable_lpm); |
| |
| int usb_unlocked_disable_lpm(struct usb_device *udev) |
| { |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); |
| |
| void usb_unlocked_enable_lpm(struct usb_device *udev) { } |
| EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); |
| |
| int usb_disable_ltm(struct usb_device *udev) |
| { |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(usb_disable_ltm); |
| |
| void usb_enable_ltm(struct usb_device *udev) { } |
| EXPORT_SYMBOL_GPL(usb_enable_ltm); |
| |
| static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, |
| u16 portstatus, u16 portchange) |
| { |
| return 0; |
| } |
| |
| #endif /* CONFIG_PM */ |
| |
| |
| /* USB 2.0 spec, 7.1.7.3 / fig 7-29: |
| * |
| * Between connect detection and reset signaling there must be a delay |
| * of 100ms at least for debounce and power-settling. The corresponding |
| * timer shall restart whenever the downstream port detects a disconnect. |
| * |
| * Apparently there are some bluetooth and irda-dongles and a number of |
| * low-speed devices for which this debounce period may last over a second. |
| * Not covered by the spec - but easy to deal with. |
| * |
| * This implementation uses a 1500ms total debounce timeout; if the |
| * connection isn't stable by then it returns -ETIMEDOUT. It checks |
| * every 25ms for transient disconnects. When the port status has been |
| * unchanged for 100ms it returns the port status. |
| */ |
| int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) |
| { |
| int ret; |
| u16 portchange, portstatus; |
| unsigned connection = 0xffff; |
| int total_time, stable_time = 0; |
| struct usb_port *port_dev = hub->ports[port1 - 1]; |
| |
| for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { |
| ret = hub_port_status(hub, port1, &portstatus, &portchange); |
| if (ret < 0) |
| return ret; |
| |
| if (!(portchange & USB_PORT_STAT_C_CONNECTION) && |
| (portstatus & USB_PORT_STAT_CONNECTION) == connection) { |
| if (!must_be_connected || |
| (connection == USB_PORT_STAT_CONNECTION)) |
| stable_time += HUB_DEBOUNCE_STEP; |
| if (stable_time >= HUB_DEBOUNCE_STABLE) |
| break; |
| } else { |
| stable_time = 0; |
| connection = portstatus & USB_PORT_STAT_CONNECTION; |
| } |
| |
| if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| usb_clear_port_feature(hub->hdev, port1, |
| USB_PORT_FEAT_C_CONNECTION); |
| } |
| |
| if (total_time >= HUB_DEBOUNCE_TIMEOUT) |
| break; |
| msleep(HUB_DEBOUNCE_STEP); |
| } |
| |
| dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n", |
| total_time, stable_time, portstatus); |
| |
| if (stable_time < HUB_DEBOUNCE_STABLE) |
| return -ETIMEDOUT; |
| return portstatus; |
| } |
| |
| void usb_ep0_reinit(struct usb_device *udev) |
| { |
| usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
| usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); |
| usb_enable_endpoint(udev, &udev->ep0, true); |
| } |
| EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
| |
| #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) |
| #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) |
| |
| static int hub_set_address(struct usb_device *udev, int devnum) |
| { |
| int retval; |
| struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| |
| /* |
| * The host controller will choose the device address, |
| * instead of the core having chosen it earlier |
| */ |
| if (!hcd->driver->address_device && devnum <= 1) |
| return -EINVAL; |
| if (udev->state == USB_STATE_ADDRESS) |
| return 0; |
| if (udev->state != USB_STATE_DEFAULT) |
| return -EINVAL; |
| if (hcd->driver->address_device) |
| retval = hcd->driver->address_device(hcd, udev); |
| else |
| retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
| USB_REQ_SET_ADDRESS, 0, devnum, 0, |
| NULL, 0, USB_CTRL_SET_TIMEOUT); |
| if (retval == 0) { |
| update_devnum(udev, devnum); |
| /* Device now using proper address. */ |
| usb_set_device_state(udev, USB_STATE_ADDRESS); |
| usb_ep0_reinit(udev); |
| } |
| return retval; |
| } |
| |
| /* |
| * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM |
| * when they're plugged into a USB 2.0 port, but they don't work when LPM is |
| * enabled. |
| * |
| * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the |
| * device says it supports the new USB 2.0 Link PM errata by setting the BESL |
| * support bit in the BOS descriptor. |
| */ |
| static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) |
| { |
| struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
| int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; |
| |
| if (!udev->usb2_hw_lpm_capable) |
| return; |
| |
| if (hub) |
| connect_type = hub->ports[udev->portnum - 1]->connect_type; |
| |
| if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || |
| connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
| udev->usb2_hw_lpm_allowed = 1; |
| usb_set_usb2_hardware_lpm(udev, 1); |
| } |
| } |
| |
| static int hub_enable_device(struct usb_device *udev) |
| { |
| struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| |
| if (!hcd->driver->enable_device) |
| return 0; |
| if (udev->state == USB_STATE_ADDRESS) |
| return 0; |
| if (udev->state != USB_STATE_DEFAULT) |
| return -EINVAL; |
| |
| return hcd->driver->enable_device(hcd, udev); |
| } |
| |
| /* Reset device, (re)assign address, get device descriptor. |
| * Device connection must be stable, no more debouncing needed. |
| * Returns device in USB_STATE_ADDRESS, except on error. |
| * |
| * If this is called for an already-existing device (as part of |
| * usb_reset_and_verify_device), the caller must own the device lock and |
| * the port lock. For a newly detected device that is not accessible |
| * through any global pointers, it's not necessary to lock the device, |
| * but it is still necessary to lock the port. |
| */ |
| static int |
| hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, |
| int retry_counter) |
| { |
| struct usb_device *hdev = hub->hdev; |
| struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
| int i, j, retval; |
| unsigned delay = HUB_SHORT_RESET_TIME; |
| enum usb_device_speed oldspeed = udev->speed; |
| const char *speed; |
| int devnum = udev->devnum; |
| |
| /* root hub ports have a slightly longer reset period |
| * (from USB 2.0 spec, section 7.1.7.5) |
| */ |
| if (!hdev->parent) { |
| delay = HUB_ROOT_RESET_TIME; |
| if (port1 == hdev->bus->otg_port) |
| hdev->bus->b_hnp_enable = 0; |
| } |
| |
| /* Some low speed devices have problems with the quick delay, so */ |
| /* be a bit pessimistic with those devices. RHbug #23670 */ |
| if (oldspeed == USB_SPEED_LOW) |
| delay = HUB_LONG_RESET_TIME; |
| |
| mutex_lock(&hdev->bus->usb_address0_mutex); |
| |
| /* Reset the device; full speed may morph to high speed */ |
| /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ |
| retval = hub_port_reset(hub, port1, udev, delay, false); |
| if (retval < 0) /* error or disconnect */ |
| goto fail; |
| /* success, speed is known */ |
| |
| retval = -ENODEV; |
| |
| if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { |
| dev_dbg(&udev->dev, "device reset changed speed!\n"); |
| goto fail; |
| } |
| oldspeed = udev->speed; |
| |
| /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
| * it's fixed size except for full speed devices. |
| * For Wireless USB devices, ep0 max packet is always 512 (tho |
| * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. |
| */ |
| switch (udev->speed) { |
| case USB_SPEED_SUPER: |
| case USB_SPEED_WIRELESS: /* fixed at 512 */ |
| udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
| break; |
| case USB_SPEED_HIGH: /* fixed at 64 */ |
| udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
| break; |
| case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ |
| /* to determine the ep0 maxpacket size, try to read |
| * the device descriptor to get bMaxPacketSize0 and |
| * then correct our initial guess. |
| */ |
| udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
| break; |
| case USB_SPEED_LOW: /* fixed at 8 */ |
| udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
| break; |
| default: |
| goto fail; |
| } |
| |
| if (udev->speed == USB_SPEED_WIRELESS) |
| speed = "variable speed Wireless"; |
| else |
| speed = usb_speed_string(udev->speed); |
| |
| if (udev->speed != USB_SPEED_SUPER) |
| dev_info(&udev->dev, |
| "%s %s USB device number %d using %s\n", |
| (udev->config) ? "reset" : "new", speed, |
| devnum, udev->bus->controller->driver->name); |
| |
| /* Set up TT records, if needed */ |
| if (hdev->tt) { |
| udev->tt = hdev->tt; |
| udev->ttport = hdev->ttport; |
| } else if (udev->speed != USB_SPEED_HIGH |
| && hdev->speed == USB_SPEED_HIGH) { |
| if (!hub->tt.hub) { |
| dev_err(&udev->dev, "parent hub has no TT\n"); |
| retval = -EINVAL; |
| goto fail; |
| } |
| udev->tt = &hub->tt; |
| udev->ttport = port1; |
| } |
| |
| /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? |
| * Because device hardware and firmware is sometimes buggy in |
| * this area, and this is how Linux has done it for ages. |
| * Change it cautiously. |
| * |
| * NOTE: If use_new_scheme() is true we will start by issuing |
| * a 64-byte GET_DESCRIPTOR request. This is what Windows does, |
| * so it may help with some non-standards-compliant devices. |
| * Otherwise we start with SET_ADDRESS and then try to read the |
| * first 8 bytes of the device descriptor to get the ep0 maxpacket |
| * value. |
| */ |
| for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { |
| bool did_new_scheme = false; |
| |
| if (use_new_scheme(udev, retry_counter)) { |
| struct usb_device_descriptor *buf; |
| int r = 0; |
| |
| did_new_scheme = true; |
| retval = hub_enable_device(udev); |
| if (retval < 0) { |
| dev_err(&udev->dev, |
| "hub failed to enable device, error %d\n", |
| retval); |
| goto fail; |
| } |
| |
| #define GET_DESCRIPTOR_BUFSIZE 64 |
| buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); |
| if (!buf) { |
| retval = -ENOMEM; |
| continue; |
| } |
| |
| /* Retry on all errors; some devices are flakey. |
| * 255 is for WUSB devices, we actually need to use |
| * 512 (WUSB1.0[4.8.1]). |
| */ |
| for (j = 0; j < 3; ++j) { |
| buf->bMaxPacketSize0 = 0; |
| r = usb_control_msg(udev, usb_rcvaddr0pipe(), |
| USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, |
| USB_DT_DEVICE << 8, 0, |
| buf, GET_DESCRIPTOR_BUFSIZE, |
| initial_descriptor_timeout); |
| switch (buf->bMaxPacketSize0) { |
| case 8: case 16: case 32: case 64: case 255: |
| if (buf->bDescriptorType == |
| USB_DT_DEVICE) { |
| r = 0; |
| break; |
| } |
| /* FALL THROUGH */ |
| default: |
| if (r == 0) |
| r = -EPROTO; |
| break; |
| } |
| if (r == 0) |
| break; |
| } |
| udev->descriptor.bMaxPacketSize0 = |
| buf->bMaxPacketSize0; |
| kfree(buf); |
| |
| retval = hub_port_reset(hub, port1, udev, delay, false); |
| if (retval < 0) /* error or disconnect */ |
| goto fail; |
| if (oldspeed != udev->speed) { |
| dev_dbg(&udev->dev, |
| "device reset changed speed!\n"); |
| retval = -ENODEV; |
| goto fail; |
| } |
| if (r) { |
| if (r != -ENODEV) |
| dev_err(&udev->dev, "device descriptor read/64, error %d\n", |
| r); |
| retval = -EMSGSIZE; |
| continue; |
| } |
| #undef GET_DESCRIPTOR_BUFSIZE |
| } |
| |
| /* |
| * If device is WUSB, we already assigned an |
| * unauthorized address in the Connect Ack sequence; |
| * authorization will assign the final address. |
| */ |
| if (udev->wusb == 0) { |
| for (j = 0; j < SET_ADDRESS_TRIES; ++j) { |
| retval = hub_set_address(udev, devnum); |
| if (retval >= 0) |
| break; |
| msleep(200); |
| } |
| if (retval < 0) { |
| if (retval != -ENODEV) |
| dev_err(&udev->dev, "device not accepting address %d, error %d\n", |
| devnum, retval); |
| goto fail; |
| } |
| if (udev->speed == USB_SPEED_SUPER) { |
| devnum = udev->devnum; |
| dev_info(&udev->dev, |
| "%s SuperSpeed USB device number %d using %s\n", |
| (udev->config) ? "reset" : "new", |
| devnum, udev->bus->controller->driver->name); |
| } |
| |
| /* cope with hardware quirkiness: |
| * - let SET_ADDRESS settle, some device hardware wants it |
| * - read ep0 maxpacket even for high and low speed, |
| */ |
| msleep(10); |
| /* use_new_scheme() checks the speed which may have |
| * changed since the initial look so we cache the result |
| * in did_new_scheme |
| */ |
| if (did_new_scheme) |
| break; |
| } |
| |
| retval = usb_get_device_descriptor(udev, 8); |
| if (retval < 8) { |
| if (retval != -ENODEV) |
| dev_err(&udev->dev, |
| "device descriptor read/8, error %d\n", |
| retval); |
| if (retval >= 0) |
| retval = -EMSGSIZE; |
| } else { |
| retval = 0; |
| break; |
| } |
| } |
| if (retval) |
| goto fail; |
| |
| if (hcd->phy && !hdev->parent) |
| usb_phy_notify_connect(hcd->phy, udev->speed); |
| |
| /* |
| * Some superspeed devices have finished the link training process |
| * and attached to a superspeed hub port, but the device descriptor |
| * got from those devices show they aren't superspeed devices. Warm |
| * reset the port attached by the devices can fix them. |
| */ |
| if ((udev->speed == USB_SPEED_SUPER) && |
| (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { |
| dev_err(&udev->dev, "got a wrong device descriptor, " |
| "warm reset device\n"); |
| hub_port_reset(hub, port1, udev, |
| HUB_BH_RESET_TIME, true); |
| retval = -EINVAL; |
| goto fail; |
| } |
| |
| if (udev->descriptor.bMaxPacketSize0 == 0xff || |
| udev->speed == USB_SPEED_SUPER) |
| i = 512; |
| else |
| i = udev->descriptor.bMaxPacketSize0; |
| if (usb_endpoint_maxp(&udev->ep0.desc) != i) { |
| if (udev->speed == USB_SPEED_LOW || |
| !(i == 8 || i == 16 || i == 32 || i == 64)) { |
| dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); |
| retval = -EMSGSIZE; |
| goto fail; |
| } |
| if (udev->speed == USB_SPEED_FULL) |
| dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); |
| else |
| dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); |
| udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
| usb_ep0_reinit(udev); |
| } |
| |
| retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); |
| if (retval < (signed)sizeof(udev->descriptor)) { |
| if (retval != -ENODEV) |
| dev_err(&udev->dev, "device descriptor read/all, error %d\n", |
| retval); |
| if (retval >= 0) |
| retval = -ENOMSG; |
| goto fail; |
| } |
| |
| if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { |
| retval = usb_get_bos_descriptor(udev); |
| if (!retval) { |
| udev->lpm_capable = usb_device_supports_lpm(udev); |
| usb_set_lpm_parameters(udev); |
| } |
| } |
| |
| retval = 0; |
| /* notify HCD that we have a device connected and addressed */ |
| if (hcd->driver->update_device) |
| hcd->driver->update_device(hcd, udev); |
| hub_set_initial_usb2_lpm_policy(udev); |
| fail: |
| if (retval) { |
| hub_port_disable(hub, port1, 0); |
| update_devnum(udev, devnum); /* for disconnect processing */ |
| } |
| mutex_unlock(&hdev->bus->usb_address0_mutex); |
| return retval; |
| } |
| |
| static void |
| check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) |
| { |
| struct usb_qualifier_descriptor *qual; |
| int status; |
| |
| qual = kmalloc (sizeof *qual, GFP_KERNEL); |
| if (qual == NULL) |
| return; |
| |
| status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, |
| qual, sizeof *qual); |
| if (status == sizeof *qual) { |
| dev_info(&udev->dev, "not running at top speed; " |
| "connect to a high speed hub\n"); |
| /* hub LEDs are probably harder to miss than syslog */ |
| if (hub->has_indicators) { |
| hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; |
| queue_delayed_work(system_power_efficient_wq, |
| &hub->leds, 0); |
| } |
| } |
| kfree(qual); |
| } |
| |
| static unsigned |
| hub_power_remaining (struct usb_hub *hub) |
| { |
| struct usb_device *hdev = hub->hdev; |
| int remaining; |
| int port1; |
| |
| if (!hub->limited_power) |
| return 0; |
| |
| remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
| for (port1 = 1; port1 <= hdev->maxchild; ++port1) { |
| struct usb_port *port_dev = hub->ports[port1 - 1]; |
| struct usb_device *udev = port_dev->child; |
| unsigned unit_load; |
| int delta; |
| |
| if (!udev) |
| continue; |
| if (hub_is_superspeed(udev)) |
| unit_load = 150; |
| else |
| unit_load = 100; |
| |
| /* |
| * Unconfigured devices may not use more than one unit load, |
| * or 8mA for OTG ports |
| */ |
| if (udev->actconfig) |
| delta = usb_get_max_power(udev, udev->actconfig); |
| else if (port1 != udev->bus->otg_port || hdev->parent) |
| delta = unit_load; |
| else |
| delta = 8; |
| if (delta > hub->mA_per_port) |
| dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n", |
| delta, hub->mA_per_port); |
| remaining -= delta; |
| } |
| if (remaining < 0) { |
| dev_warn(hub->intfdev, "%dmA over power budget!\n", |
| -remaining); |
| remaining = 0; |
| } |
| return remaining; |
| } |
| |
| static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, |
| u16 portchange) |
| { |
| int status, i; |
| unsigned unit_load; |
| struct usb_device *hdev = hub->hdev; |
| struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
| struct usb_port *port_dev = hub->ports[port1 - 1]; |
| struct usb_device *udev = port_dev->child; |
| |
| /* Disconnect any existing devices under this port */ |
| if (udev) { |
| if (hcd->phy && !hdev->parent && |
| !(portstatus & USB_PORT_STAT_CONNECTION)) |
| usb_phy_notify_disconnect(hcd->phy, udev->speed); |
| usb_disconnect(&port_dev->child); |
| } |
| |
| /* We can forget about a "removed" device when there's a physical |
| * disconnect or the connect status changes. |
| */ |
| if (!(portstatus & USB_PORT_STAT_CONNECTION) || |
| (portchange & USB_PORT_STAT_C_CONNECTION)) |
| clear_bit(port1, hub->removed_bits); |
| |
| if (portchange & (USB_PORT_STAT_C_CONNECTION | |
| USB_PORT_STAT_C_ENABLE)) { |
| status = hub_port_debounce_be_stable(hub, port1); |
| if (status < 0) { |
| if (status != -ENODEV && printk_ratelimit()) |
| dev_err(&port_dev->dev, |
| "connect-debounce failed\n"); |
| portstatus &= ~USB_PORT_STAT_CONNECTION; |
| } else { |
| portstatus = status; |
| } |
| } |
| |
| /* Return now if debouncing failed or nothing is connected or |
| * the device was "removed". |
| */ |
| if (!(portstatus & USB_PORT_STAT_CONNECTION) || |
| test_bit(port1, hub->removed_bits)) { |
| |
| /* maybe switch power back on (e.g. root hub was reset) */ |
| if (hub_is_port_power_switchable(hub) |
| && !port_is_power_on(hub, portstatus)) |
| set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
| |
| if (portstatus & USB_PORT_STAT_ENABLE) |
| goto done; |
| return; |
| } |
| if (hub_is_superspeed(hub->hdev)) |
| unit_load = 150; |
| else |
| unit_load = 100; |
| |
| status = 0; |
| for (i = 0; i < SET_CONFIG_TRIES; i++) { |
| |
| /* reallocate for each attempt, since references |
| * to the previous one can escape in various ways |
| */ |
| udev = usb_alloc_dev(hdev, hdev->bus, port1); |
| if (!udev) { |
| dev_err(&port_dev->dev, |
| "couldn't allocate usb_device\n"); |
| goto done; |
| } |
| |
| usb_set_device_state(udev, USB_STATE_POWERED); |
| udev->bus_mA = hub->mA_per_port; |
| udev->level = hdev->level + 1; |
| udev->wusb = hub_is_wusb(hub); |
| |
| /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ |
| if (hub_is_superspeed(hub->hdev)) |
| udev->speed = USB_SPEED_SUPER; |
| else |
| udev->speed = USB_SPEED_UNKNOWN; |
| |
| choose_devnum(udev); |
| if (udev->devnum <= 0) { |
| status = -ENOTCONN; /* Don't retry */ |
| goto loop; |
| } |
| |
| /* reset (non-USB 3.0 devices) and get descriptor */ |
| usb_lock_port(port_dev); |
| status = hub_port_init(hub, udev, port1, i); |
| usb_unlock_port(port_dev); |
| if (status < 0) |
| goto loop; |
| |
| usb_detect_quirks(udev); |
| if (udev->quirks & USB_QUIRK_DELAY_INIT) |
| msleep(1000); |
| |
| /* consecutive bus-powered hubs aren't reliable; they can |
| * violate the voltage drop budget. if the new child has |
| * a "powered" LED, users should notice we didn't enable it |
| * (without reading syslog), even without per-port LEDs |
| * on the parent. |
| */ |
| if (udev->descriptor.bDeviceClass == USB_CLASS_HUB |
| && udev->bus_mA <= unit_load) { |
| u16 devstat; |
| |
| status = usb_get_status(udev, USB_RECIP_DEVICE, 0, |
| &devstat); |
| if (status) { |
| dev_dbg(&udev->dev, "get status %d ?\n", status); |
| goto loop_disable; |
| } |
| if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
| dev_err(&udev->dev, |
| "can't connect bus-powered hub " |
| "to this port\n"); |
| if (hub->has_indicators) { |
| hub->indicator[port1-1] = |
| INDICATOR_AMBER_BLINK; |
| queue_delayed_work( |
| system_power_efficient_wq, |
| &hub->leds, 0); |
| } |
| status = -ENOTCONN; /* Don't retry */ |
| goto loop_disable; |
| } |
| } |
| |
| /* check for devices running slower than they could */ |
| if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 |
| && udev->speed == USB_SPEED_FULL |
| && highspeed_hubs != 0) |
| check_highspeed (hub, udev, port1); |
| |
| /* Store the parent's children[] pointer. At this point |
| * udev becomes globally accessible, although presumably |
| * no one will look at it until hdev is unlocked. |
| */ |
| status = 0; |
| |
| mutex_lock(&usb_port_peer_mutex); |
| |
| /* We mustn't add new devices if the parent hub has |
| * been disconnected; we would race with the |
| * recursively_mark_NOTATTACHED() routine. |
| */ |
| spin_lock_irq(&device_state_lock); |
| if (hdev->state == USB_STATE_NOTATTACHED) |
| status = -ENOTCONN; |
| else |
| port_dev->child = udev; |
| spin_unlock_irq(&device_state_lock); |
| mutex_unlock(&usb_port_peer_mutex); |
| |
| /* Run it through the hoops (find a driver, etc) */ |
| if (!status) { |
| status = usb_new_device(udev); |
| if (status) { |
| mutex_lock(&usb_port_peer_mutex); |
| spin_lock_irq(&device_state_lock); |
| port_dev->child = NULL; |
| spin_unlock_irq(&device_state_lock); |
| mutex_unlock(&usb_port_peer_mutex); |
| } |
| } |
| |
| if (status) |
| goto loop_disable; |
| |
| status = hub_power_remaining(hub); |
| if (status) |
| dev_dbg(hub->intfdev, "%dmA power budget left\n", status); |
| |
| return; |
| |
| loop_disable: |
| hub_port_disable(hub, port1, 1); |
| loop: |
| usb_ep0_reinit(udev); |
| release_devnum(udev); |
| hub_free_dev(udev); |
| usb_put_dev(udev); |
| if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
| break; |
| } |
| if (hub->hdev->parent || |
| !hcd->driver->port_handed_over || |
| !(hcd->driver->port_handed_over)(hcd, port1)) { |
| if (status != -ENOTCONN && status != -ENODEV) |
| dev_err(&port_dev->dev, |
| "unable to enumerate USB device\n"); |
| } |
| |
| done: |
| hub_port_disable(hub, port1, 1); |
| if (hcd->driver->relinquish_port && !hub->hdev->parent) |
| hcd->driver->relinquish_port(hcd, port1); |
| |
| } |
| |
| /* Handle physical or logical connection change events. |
| * This routine is called when: |
| * a port connection-change occurs; |
| * a port enable-change occurs (often caused by EMI); |
| * usb_reset_and_verify_device() encounters changed descriptors (as from |
| * a firmware download) |
| * caller already locked the hub |
| */ |
| static void hub_port_connect_change(struct usb_hub *hub, int port1, |
| u16 portstatus, u16 portchange) |
| __must_hold(&port_dev->status_lock) |
| { |
| struct usb_port *port_dev = hub->ports[port1 - 1]; |
| struct usb_device *udev = port_dev->child; |
| int status = -ENODEV; |
| |
| dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus, |
| portchange, portspeed(hub, portstatus)); |
| |
| if (hub->has_indicators) { |
| set_port_led(hub, port1, HUB_LED_AUTO); |
| hub->indicator[port1-1] = INDICATOR_AUTO; |
| } |
| |
| #ifdef CONFIG_USB_OTG |
| /* during HNP, don't repeat the debounce */ |
| if (hub->hdev->bus->is_b_host) |
| portchange &= ~(USB_PORT_STAT_C_CONNECTION | |
| USB_PORT_STAT_C_ENABLE); |
| #endif |
| |
| /* Try to resuscitate an existing device */ |
| if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && |
| udev->state != USB_STATE_NOTATTACHED) { |
| if (portstatus & USB_PORT_STAT_ENABLE) { |
| status = 0; /* Nothing to do */ |
| #ifdef CONFIG_PM_RUNTIME |
| } else if (udev->state == USB_STATE_SUSPENDED && |
| udev->persist_enabled) { |
| /* For a suspended device, treat this as a |
| * remote wakeup event. |
| */ |
| usb_unlock_port(port_dev); |
| status = usb_remote_wakeup(udev); |
| usb_lock_port(port_dev); |
| #endif |
| } else { |
| /* Don't resuscitate */; |
| } |
| } |
| clear_bit(port1, hub->change_bits); |
| |
| /* successfully revalidated the connection */ |
| if (status == 0) |
| return; |
| |
| usb_unlock_port(port_dev); |
| hub_port_connect(hub, port1, portstatus, portchange); |
| usb_lock_port(port_dev); |
| } |
| |
| static void port_event(struct usb_hub *hub, int port1) |
| __must_hold(&port_dev->status_lock) |
| { |
| int connect_change, reset_device = 0; |
| struct usb_port *port_dev = hub->ports[port1 - 1]; |
| struct usb_device *udev = port_dev->child; |
| struct usb_device *hdev = hub->hdev; |
| u16 portstatus, portchange; |
| |
| connect_change = test_bit(port1, hub->change_bits); |
| clear_bit(port1, hub->event_bits); |
| clear_bit(port1, hub->wakeup_bits); |
| |
| if (hub_port_status(hub, port1, &portstatus, &portchange) < 0) |
| return; |
| |
| if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); |
| connect_change = 1; |
| } |
| |
| if (portchange & USB_PORT_STAT_C_ENABLE) { |
| if (!connect_change) |
| dev_dbg(&port_dev->dev, "enable change, status %08x\n", |
| portstatus); |
| usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); |
| |
| /* |
| * EM interference sometimes causes badly shielded USB devices |
| * to be shutdown by the hub, this hack enables them again. |
| * Works at least with mouse driver. |
| */ |
| if (!(portstatus & USB_PORT_STAT_ENABLE) |
| && !connect_change && udev) { |
| dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n"); |
| connect_change = 1; |
| } |
| } |
| |
| if (portchange & USB_PORT_STAT_C_OVERCURRENT) { |
| u16 status = 0, unused; |
| |
| dev_dbg(&port_dev->dev, "over-current change\n"); |
| usb_clear_port_feature(hdev, port1, |
| USB_PORT_FEAT_C_OVER_CURRENT); |
| msleep(100); /* Cool down */ |
| hub_power_on(hub, true); |
| hub_port_status(hub, port1, &status, &unused); |
| if (status & USB_PORT_STAT_OVERCURRENT) |
| dev_err(&port_dev->dev, "over-current condition\n"); |
| } |
| |
| if (portchange & USB_PORT_STAT_C_RESET) { |
| dev_dbg(&port_dev->dev, "reset change\n"); |
| usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET); |
| } |
| if ((portchange & USB_PORT_STAT_C_BH_RESET) |
| && hub_is_superspeed(hdev)) { |
| dev_dbg(&port_dev->dev, "warm reset change\n"); |
| usb_clear_port_feature(hdev, port1, |
| USB_PORT_FEAT_C_BH_PORT_RESET); |
| } |
| if (portchange & USB_PORT_STAT_C_LINK_STATE) { |
| dev_dbg(&port_dev->dev, "link state change\n"); |
| usb_clear_port_feature(hdev, port1, |
| USB_PORT_FEAT_C_PORT_LINK_STATE); |
| } |
| if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { |
| dev_warn(&port_dev->dev, "config error\n"); |
| usb_clear_port_feature(hdev, port1, |
| USB_PORT_FEAT_C_PORT_CONFIG_ERROR); |
| } |
| |
| /* skip port actions that require the port to be powered on */ |
| if (!pm_runtime_active(&port_dev->dev)) |
| return; |
| |
| if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange)) |
| connect_change = 1; |
| |
| /* |
| * Warm reset a USB3 protocol port if it's in |
| * SS.Inactive state. |
| */ |
| if (hub_port_warm_reset_required(hub, portstatus)) { |
| dev_dbg(&port_dev->dev, "do warm reset\n"); |
| if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION) |
| || udev->state == USB_STATE_NOTATTACHED) { |
| if (hub_port_reset(hub, port1, NULL, |
| HUB_BH_RESET_TIME, true) < 0) |
| hub_port_disable(hub, port1, 1); |
| } else |
| reset_device = 1; |
| } |
| |
| /* |
| * On disconnect USB3 protocol ports transit from U0 to |
| * SS.Inactive to Rx.Detect. If this happens a warm- |
| * reset is not needed, but a (re)connect may happen |
| * before khubd runs and sees the disconnect, and the |
| * device may be an unknown state. |
| * |
| * If the port went through SS.Inactive without khubd |
| * seeing it the C_LINK_STATE change flag will be set, |
| * and we reset the dev to put it in a known state. |
| */ |
| if (reset_device || (udev && hub_is_superspeed(hub->hdev) |
| && (portchange & USB_PORT_STAT_C_LINK_STATE) |
| && (portstatus & USB_PORT_STAT_CONNECTION))) { |
| usb_unlock_port(port_dev); |
| usb_lock_device(udev); |
| usb_reset_device(udev); |
| usb_unlock_device(udev); |
| usb_lock_port(port_dev); |
| connect_change = 0; |
| } |
| |
| if (connect_change) |
| hub_port_connect_change(hub, port1, portstatus, portchange); |
| } |
| |
| |
| static void hub_events(void) |
| { |
| struct list_head *tmp; |
| struct usb_device *hdev; |
| struct usb_interface *intf; |
| struct usb_hub *hub; |
| struct device *hub_dev; |
| u16 hubstatus; |
| u16 hubchange; |
| int i, ret; |
| |
| /* |
| * We restart the list every time to avoid a deadlock with |
| * deleting hubs downstream from this one. This should be |
| * safe since we delete the hub from the event list. |
| * Not the most efficient, but avoids deadlocks. |
| */ |
| while (1) { |
| |
| /* Grab the first entry at the beginning of the list */ |
| spin_lock_irq(&hub_event_lock); |
| if (list_empty(&hub_event_list)) { |
| spin_unlock_irq(&hub_event_lock); |
| break; |
| } |
| |
| tmp = hub_event_list.next; |
| list_del_init(tmp); |
| |
| hub = list_entry(tmp, struct usb_hub, event_list); |
| kref_get(&hub->kref); |
| spin_unlock_irq(&hub_event_lock); |
| |
| hdev = hub->hdev; |
| hub_dev = hub->intfdev; |
| intf = to_usb_interface(hub_dev); |
| dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
| hdev->state, hdev->maxchild, |
| /* NOTE: expects max 15 ports... */ |
| (u16) hub->change_bits[0], |
| (u16) hub->event_bits[0]); |
| |
| /* Lock the device, then check to see if we were |
| * disconnected while waiting for the lock to succeed. */ |
| usb_lock_device(hdev); |
| if (unlikely(hub->disconnected)) |
| goto loop_disconnected; |
| |
| /* If the hub has died, clean up after it */ |
| if (hdev->state == USB_STATE_NOTATTACHED) { |
| hub->error = -ENODEV; |
| hub_quiesce(hub, HUB_DISCONNECT); |
| goto loop; |
| } |
| |
| /* Autoresume */ |
| ret = usb_autopm_get_interface(intf); |
| if (ret) { |
| dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); |
| goto loop; |
| } |
| |
| /* If this is an inactive hub, do nothing */ |
| if (hub->quiescing) |
| goto loop_autopm; |
| |
| if (hub->error) { |
| dev_dbg (hub_dev, "resetting for error %d\n", |
| hub->error); |
| |
| ret = usb_reset_device(hdev); |
| if (ret) { |
| dev_dbg (hub_dev, |
| "error resetting hub: %d\n", ret); |
| goto loop_autopm; |
| } |
| |
| hub->nerrors = 0; |
| hub->error = 0; |
| } |
| |
| /* deal with port status changes */ |
| for (i = 1; i <= hdev->maxchild; i++) { |
| struct usb_port *port_dev = hub->ports[i - 1]; |
| |
| if (test_bit(i, hub->event_bits) |
| || test_bit(i, hub->change_bits) |
| || test_bit(i, hub->wakeup_bits)) { |
| /* |
| * The get_noresume and barrier ensure that if |
| * the port was in the process of resuming, we |
| * flush that work and keep the port active for |
| * the duration of the port_event(). However, |
| * if the port is runtime pm suspended |
| * (powered-off), we leave it in that state, run |
| * an abbreviated port_event(), and move on. |
| */ |
| pm_runtime_get_noresume(&port_dev->dev); |
| pm_runtime_barrier(&port_dev->dev); |
| usb_lock_port(port_dev); |
| port_event(hub, i); |
| usb_unlock_port(port_dev); |
| pm_runtime_put_sync(&port_dev->dev); |
| } |
| } |
| |
| /* deal with hub status changes */ |
| if (test_and_clear_bit(0, hub->event_bits) == 0) |
| ; /* do nothing */ |
| else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) |
| dev_err (hub_dev, "get_hub_status failed\n"); |
| else { |
| if (hubchange & HUB_CHANGE_LOCAL_POWER) { |
| dev_dbg (hub_dev, "power change\n"); |
| clear_hub_feature(hdev, C_HUB_LOCAL_POWER); |
| if (hubstatus & HUB_STATUS_LOCAL_POWER) |
| /* FIXME: Is this always true? */ |
| hub->limited_power = 1; |
| else |
| hub->limited_power = 0; |
| } |
| if (hubchange & HUB_CHANGE_OVERCURRENT) { |
| u16 status = 0; |
| u16 unused; |
| |
| dev_dbg(hub_dev, "over-current change\n"); |
| clear_hub_feature(hdev, C_HUB_OVER_CURRENT); |
| msleep(500); /* Cool down */ |
| hub_power_on(hub, true); |
| hub_hub_status(hub, &status, &unused); |
| if (status & HUB_STATUS_OVERCURRENT) |
| dev_err(hub_dev, "over-current " |
| "condition\n"); |
| } |
| } |
| |
| loop_autopm: |
| /* Balance the usb_autopm_get_interface() above */ |
| usb_autopm_put_interface_no_suspend(intf); |
| loop: |
| /* Balance the usb_autopm_get_interface_no_resume() in |
| * kick_khubd() and allow autosuspend. |
| */ |
| usb_autopm_put_interface(intf); |
| loop_disconnected: |
| usb_unlock_device(hdev); |
| kref_put(&hub->kref, hub_release); |
| |
| } /* end while (1) */ |
| } |
| |
| static int hub_thread(void *__unused) |
| { |
| /* khubd needs to be freezable to avoid interfering with USB-PERSIST |
| * port handover. Otherwise it might see that a full-speed device |
| * was gone before the EHCI controller had handed its port over to |
| * the companion full-speed controller. |
| */ |
| set_freezable(); |
| |
| do { |
| hub_events(); |
| wait_event_freezable(khubd_wait, |
| !list_empty(&hub_event_list) || |
| kthread_should_stop()); |
| } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
| |
| pr_debug("%s: khubd exiting\n", usbcore_name); |
| return 0; |
| } |
| |
| static const struct usb_device_id hub_id_table[] = { |
| { .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
| | USB_DEVICE_ID_MATCH_INT_CLASS, |
| .idVendor = USB_VENDOR_GENESYS_LOGIC, |
| .bInterfaceClass = USB_CLASS_HUB, |
| .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, |
| { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
| .bDeviceClass = USB_CLASS_HUB}, |
| { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, |
| .bInterfaceClass = USB_CLASS_HUB}, |
| { } /* Terminating entry */ |
| }; |
| |
| MODULE_DEVICE_TABLE (usb, hub_id_table); |
| |
| static struct usb_driver hub_driver = { |
| .name = "hub", |
| .probe = hub_probe, |
| .disconnect = hub_disconnect, |
| .suspend = hub_suspend, |
| .resume = hub_resume, |
| .reset_resume = hub_reset_resume, |
| .pre_reset = hub_pre_reset, |
| .post_reset = hub_post_reset, |
| .unlocked_ioctl = hub_ioctl, |
| .id_table = hub_id_table, |
| .supports_autosuspend = 1, |
| }; |
| |
| int usb_hub_init(void) |
| { |
| if (usb_register(&hub_driver) < 0) { |
| printk(KERN_ERR "%s: can't register hub driver\n", |
| usbcore_name); |
| return -1; |
| } |
| |
| khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
| if (!IS_ERR(khubd_task)) |
| return 0; |
| |
| /* Fall through if kernel_thread failed */ |
| usb_deregister(&hub_driver); |
| printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); |
| |
| return -1; |
| } |
| |
| void usb_hub_cleanup(void) |
| { |
| kthread_stop(khubd_task); |
| |
| /* |
| * Hub resources are freed for us by usb_deregister. It calls |
| * usb_driver_purge on every device which in turn calls that |
| * devices disconnect function if it is using this driver. |
| * The hub_disconnect function takes care of releasing the |
| * individual hub resources. -greg |
| */ |
| usb_deregister(&hub_driver); |
| } /* usb_hub_cleanup() */ |
| |
| static int descriptors_changed(struct usb_device *udev, |
| struct usb_device_descriptor *old_device_descriptor, |
| struct usb_host_bos *old_bos) |
| { |
| int changed = 0; |
| unsigned index; |
| unsigned serial_len = 0; |
| unsigned len; |
| unsigned old_length; |
| int length; |
| char *buf; |
| |
| if (memcmp(&udev->descriptor, old_device_descriptor, |
| sizeof(*old_device_descriptor)) != 0) |
| return 1; |
| |
| if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) |
| return 1; |
| if (udev->bos) { |
| len = le16_to_cpu(udev->bos->desc->wTotalLength); |
| if (len != le16_to_cpu(old_bos->desc->wTotalLength)) |
| return 1; |
| if (memcmp(udev->bos->desc, old_bos->desc, len)) |
| return 1; |
| } |
| |
| /* Since the idVendor, idProduct, and bcdDevice values in the |
| * device descriptor haven't changed, we will assume the |
| * Manufacturer and Product strings haven't changed either. |
| * But the SerialNumber string could be different (e.g., a |
| * different flash card of the same brand). |
| */ |
| if (udev->serial) |
| serial_len = strlen(udev->serial) + 1; |
| |
| len = serial_len; |
| for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
| old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
| len = max(len, old_length); |
| } |
| |
| buf = kmalloc(len, GFP_NOIO); |
| if (buf == NULL) { |
| dev_err(&udev->dev, "no mem to re-read configs after reset\n"); |
| /* assume the worst */ |
| return 1; |
| } |
| for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
| old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
| length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
| old_length); |
| if (length != old_length) { |
| dev_dbg(&udev->dev, "config index %d, error %d\n", |
| index, length); |
| changed = 1; |
| break; |
| } |
| if (memcmp (buf, udev->rawdescriptors[index], old_length) |
| != 0) { |
| dev_dbg(&udev->dev, "config index %d changed (#%d)\n", |
| index, |
| ((struct usb_config_descriptor *) buf)-> |
| bConfigurationValue); |
| changed = 1; |
| break; |
| } |
| } |
| |
| if (!changed && serial_len) { |
| length = usb_string(udev, udev->descriptor.iSerialNumber, |
| buf, serial_len); |
| if (length + 1 != serial_len) { |
| dev_dbg(&udev->dev, "serial string error %d\n", |
| length); |
| changed = 1; |
| } else if (memcmp(buf, udev->serial, length) != 0) { |
| dev_dbg(&udev->dev, "serial string changed\n"); |
| changed = 1; |
| } |
| } |
| |
| kfree(buf); |
| return changed; |
| } |
| |
| /** |
| * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
| * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
| * |
| * WARNING - don't use this routine to reset a composite device |
| * (one with multiple interfaces owned by separate drivers)! |
| * Use usb_reset_device() instead. |
| * |
| * Do a port reset, reassign the device's address, and establish its |
| * former operating configuration. If the reset fails, or the device's |
| * descriptors change from their values before the reset, or the original |
| * configuration and altsettings cannot be restored, a flag will be set |
| * telling khubd to pretend the device has been disconnected and then |
| * re-connected. All drivers will be unbound, and the device will be |
| * re-enumerated and probed all over again. |
| * |
| * Return: 0 if the reset succeeded, -ENODEV if the device has been |
| * flagged for logical disconnection, or some other negative error code |
| * if the reset wasn't even attempted. |
| * |
| * Note: |
| * The caller must own the device lock and the port lock, the latter is |
| * taken by usb_reset_device(). For example, it's safe to use |
| * usb_reset_device() from a driver probe() routine after downloading |
| * new firmware. For calls that might not occur during probe(), drivers |
| * should lock the device using usb_lock_device_for_reset(). |
| * |
| * Locking exception: This routine may also be called from within an |
| * autoresume handler. Such usage won't conflict with other tasks |
| * holding the device lock because these tasks should always call |
| * usb_autopm_resume_device(), thereby preventing any unwanted |
| * autoresume. The autoresume handler is expected to have already |
| * acquired the port lock before calling this routine. |
| */ |
| static int usb_reset_and_verify_device(struct usb_device *udev) |
| { |
| struct usb_device *parent_hdev = udev->parent; |
| struct usb_hub *parent_hub; |
| struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| struct usb_device_descriptor descriptor = udev->descriptor; |
| struct usb_host_bos *bos; |
| int i, j, ret = 0; |
| int port1 = udev->portnum; |
| |
| if (udev->state == USB_STATE_NOTATTACHED || |
| udev->state == USB_STATE_SUSPENDED) { |
| dev_dbg(&udev->dev, "device reset not allowed in state %d\n", |
| udev->state); |
| return -EINVAL; |
| } |
| |
| if (!parent_hdev) |
| return -EISDIR; |
| |
| parent_hub = usb_hub_to_struct_hub(parent_hdev); |
| |
| /* Disable USB2 hardware LPM. |
| * It will be re-enabled by the enumeration process. |
| */ |
| if (udev->usb2_hw_lpm_enabled == 1) |
| usb_set_usb2_hardware_lpm(udev, 0); |
| |
| bos = udev->bos; |
| udev->bos = NULL; |
| |
| /* Disable LPM and LTM while we reset the device and reinstall the alt |
| * settings. Device-initiated LPM settings, and system exit latency |
| * settings are cleared when the device is reset, so we have to set |
| * them up again. |
| */ |
| ret = usb_unlocked_disable_lpm(udev); |
| if (ret) { |
| dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); |
| goto re_enumerate; |
| } |
| ret = usb_disable_ltm(udev); |
| if (ret) { |
| dev_err(&udev->dev, "%s Failed to disable LTM\n.", |
| __func__); |
| goto re_enumerate; |
| } |
| |
| for (i = 0; i < SET_CONFIG_TRIES; ++i) { |
| |
| /* ep0 maxpacket size may change; let the HCD know about it. |
| * Other endpoints will be handled by re-enumeration. */ |
| usb_ep0_reinit(udev); |
| ret = hub_port_init(parent_hub, udev, port1, i); |
| if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
| break; |
| } |
| |
| if (ret < 0) |
| goto re_enumerate; |
| |
| /* Device might have changed firmware (DFU or similar) */ |
| if (descriptors_changed(udev, &descriptor, bos)) { |
| dev_info(&udev->dev, "device firmware changed\n"); |
| udev->descriptor = descriptor; /* for disconnect() calls */ |
| goto re_enumerate; |
| } |
| |
| /* Restore the device's previous configuration */ |
| if (!udev->actconfig) |
| goto done; |
| |
| mutex_lock(hcd->bandwidth_mutex); |
| ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); |
| if (ret < 0) { |
| dev_warn(&udev->dev, |
| "Busted HC? Not enough HCD resources for " |
| "old configuration.\n"); |
| mutex_unlock(hcd->bandwidth_mutex); |
| goto re_enumerate; |
| } |
| ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| USB_REQ_SET_CONFIGURATION, 0, |
| udev->actconfig->desc.bConfigurationValue, 0, |
| NULL, 0, USB_CTRL_SET_TIMEOUT); |
| if (ret < 0) { |
| dev_err(&udev->dev, |
| "can't restore configuration #%d (error=%d)\n", |
| udev->actconfig->desc.bConfigurationValue, ret); |
| mutex_unlock(hcd->bandwidth_mutex); |
| goto re_enumerate; |
| } |
| mutex_unlock(hcd->bandwidth_mutex); |
| usb_set_device_state(udev, USB_STATE_CONFIGURED); |
| |
| /* Put interfaces back into the same altsettings as before. |
| * Don't bother to send the Set-Interface request for interfaces |
| * that were already in altsetting 0; besides being unnecessary, |
| * many devices can't handle it. Instead just reset the host-side |
| * endpoint state. |
| */ |
| for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
| struct usb_host_config *config = udev->actconfig; |
| struct usb_interface *intf = config->interface[i]; |
| struct usb_interface_descriptor *desc; |
| |
| desc = &intf->cur_altsetting->desc; |
| if (desc->bAlternateSetting == 0) { |
| usb_disable_interface(udev, intf, true); |
| usb_enable_interface(udev, intf, true); |
| ret = 0; |
| } else { |
| /* Let the bandwidth allocation function know that this |
| * device has been reset, and it will have to use |
| * alternate setting 0 as the current alternate setting. |
| */ |
| intf->resetting_device = 1; |
| ret = usb_set_interface(udev, desc->bInterfaceNumber, |
| desc->bAlternateSetting); |
| intf->resetting_device = 0; |
| } |
| if (ret < 0) { |
| dev_err(&udev->dev, "failed to restore interface %d " |
| "altsetting %d (error=%d)\n", |
| desc->bInterfaceNumber, |
| desc->bAlternateSetting, |
| ret); |
| goto re_enumerate; |
| } |
| /* Resetting also frees any allocated streams */ |
| for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) |
| intf->cur_altsetting->endpoint[j].streams = 0; |
| } |
| |
| done: |
| /* Now that the alt settings are re-installed, enable LTM and LPM. */ |
| usb_set_usb2_hardware_lpm(udev, 1); |
| usb_unlocked_enable_lpm(udev); |
| usb_enable_ltm(udev); |
| usb_release_bos_descriptor(udev); |
| udev->bos = bos; |
| return 0; |
| |
| re_enumerate: |
| /* LPM state doesn't matter when we're about to destroy the device. */ |
| hub_port_logical_disconnect(parent_hub, port1); |
| usb_release_bos_descriptor(udev); |
| udev->bos = bos; |
| return -ENODEV; |
| } |
| |
| /** |
| * usb_reset_device - warn interface drivers and perform a USB port reset |
| * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
| * |
| * Warns all drivers bound to registered interfaces (using their pre_reset |
| * method), performs the port reset, and then lets the drivers know that |
| * the reset is over (using their post_reset method). |
| * |
| * Return: The same as for usb_reset_and_verify_device(). |
| * |
| * Note: |
| * The caller must own the device lock. For example, it's safe to use |
| * this from a driver probe() routine after downloading new firmware. |
| * For calls that might not occur during probe(), drivers should lock |
| * the device using usb_lock_device_for_reset(). |
| * |
| * If an interface is currently being probed or disconnected, we assume |
| * its driver knows how to handle resets. For all other interfaces, |
| * if the driver doesn't have pre_reset and post_reset methods then |
| * we attempt to unbind it and rebind afterward. |
| */ |
| int usb_reset_device(struct usb_device *udev) |
| { |
| int ret; |
| int i; |
| unsigned int noio_flag; |
| struct usb_port *port_dev; |
| struct usb_host_config *config = udev->actconfig; |
| struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
| |
| if (udev->state == USB_STATE_NOTATTACHED || |
| udev->state == USB_STATE_SUSPENDED) { |
| dev_dbg(&udev->dev, "device reset not allowed in state %d\n", |
| udev->state); |
| return -EINVAL; |
| } |
| |
| if (!udev->parent) { |
| /* this requires hcd-specific logic; see ohci_restart() */ |
| dev_dbg(&udev->dev, "%s for root hub!\n", __func__); |
| return -EISDIR; |
| } |
| |
| port_dev = hub->ports[udev->portnum - 1]; |
| |
| /* |
| * Don't allocate memory with GFP_KERNEL in current |
| * context to avoid possible deadlock if usb mass |
| * storage interface or usbnet interface(iSCSI case) |
| * is included in current configuration. The easist |
| * approach is to do it for every device reset, |
| * because the device 'memalloc_noio' flag may have |
| * not been set before reseting the usb device. |
| */ |
| noio_flag = memalloc_noio_save(); |
| |
| /* Prevent autosuspend during the reset */ |
| usb_autoresume_device(udev); |
| |
| if (config) { |
| for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
| struct usb_interface *cintf = config->interface[i]; |
| struct usb_driver *drv; |
| int unbind = 0; |
| |
| if (cintf->dev.driver) { |
| drv = to_usb_driver(cintf->dev.driver); |
| if (drv->pre_reset && drv->post_reset) |
| unbind = (drv->pre_reset)(cintf); |
| else if (cintf->condition == |
| USB_INTERFACE_BOUND) |
| unbind = 1; |
| if (unbind) |
| usb_forced_unbind_intf(cintf); |
| } |
| } |
| } |
| |
| usb_lock_port(port_dev); |
| ret = usb_reset_and_verify_device(udev); |
| usb_unlock_port(port_dev); |
| |
| if (config) { |
| for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
| struct usb_interface *cintf = config->interface[i]; |
| struct usb_driver *drv; |
| int rebind = cintf->needs_binding; |
| |
| if (!rebind && cintf->dev.driver) { |
| drv = to_usb_driver(cintf->dev.driver); |
| if (drv->post_reset) |
| rebind = (drv->post_reset)(cintf); |
| else if (cintf->condition == |
| USB_INTERFACE_BOUND) |
| rebind = 1; |
| if (rebind) |
| cintf->needs_binding = 1; |
| } |
| } |
| usb_unbind_and_rebind_marked_interfaces(udev); |
| } |
| |
| usb_autosuspend_device(udev); |
| memalloc_noio_restore(noio_flag); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(usb_reset_device); |
| |
| |
| /** |
| * usb_queue_reset_device - Reset a USB device from an atomic context |
| * @iface: USB interface belonging to the device to reset |
| * |
| * This function can be used to reset a USB device from an atomic |
| * context, where usb_reset_device() won't work (as it blocks). |
| * |
| * Doing a reset via this method is functionally equivalent to calling |
| * usb_reset_device(), except for the fact that it is delayed to a |
| * workqueue. This means that any drivers bound to other interfaces |
| * might be unbound, as well as users from usbfs in user space. |
| * |
| * Corner cases: |
| * |
| * - Scheduling two resets at the same time from two different drivers |
| * attached to two different interfaces of the same device is |
| * possible; depending on how the driver attached to each interface |
| * handles ->pre_reset(), the second reset might happen or not. |
| * |
| * - If a driver is unbound and it had a pending reset, the reset will |
| * be cancelled. |
| * |
| * - This function can be called during .probe() or .disconnect() |
| * times. On return from .disconnect(), any pending resets will be |
| * cancelled. |
| * |
| * There is no no need to lock/unlock the @reset_ws as schedule_work() |
| * does its own. |
| * |
| * NOTE: We don't do any reference count tracking because it is not |
| * needed. The lifecycle of the work_struct is tied to the |
| * usb_interface. Before destroying the interface we cancel the |
| * work_struct, so the fact that work_struct is queued and or |
| * running means the interface (and thus, the device) exist and |
| * are referenced. |
| */ |
| void usb_queue_reset_device(struct usb_interface *iface) |
| { |
| schedule_work(&iface->reset_ws); |
| } |
| EXPORT_SYMBOL_GPL(usb_queue_reset_device); |
| |
| /** |
| * usb_hub_find_child - Get the pointer of child device |
| * attached to the port which is specified by @port1. |
| * @hdev: USB device belonging to the usb hub |
| * @port1: port num to indicate which port the child device |
| * is attached to. |
| * |
| * USB drivers call this function to get hub's child device |
| * pointer. |
| * |
| * Return: %NULL if input param is invalid and |
| * child's usb_device pointer if non-NULL. |
| */ |
| struct usb_device *usb_hub_find_child(struct usb_device *hdev, |
| int port1) |
| { |
| struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
| |
| if (port1 < 1 || port1 > hdev->maxchild) |
| return NULL; |
| return hub->ports[port1 - 1]->child; |
| } |
| EXPORT_SYMBOL_GPL(usb_hub_find_child); |
| |
| void usb_hub_adjust_deviceremovable(struct usb_device *hdev, |
| struct usb_hub_descriptor *desc) |
| { |
| struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
| enum usb_port_connect_type connect_type; |
| int i; |
| |
| if (!hub) |
| return; |
| |
| if (!hub_is_superspeed(hdev)) { |
| for (i = 1; i <= hdev->maxchild; i++) { |
| struct usb_port *port_dev = hub->ports[i - 1]; |
| |
| connect_type = port_dev->connect_type; |
| if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
| u8 mask = 1 << (i%8); |
| |
| if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { |
| dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
| desc->u.hs.DeviceRemovable[i/8] |= mask; |
| } |
| } |
| } |
| } else { |
| u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); |
| |
| for (i = 1; i <= hdev->maxchild; i++) { |
| struct usb_port *port_dev = hub->ports[i - 1]; |
| |
| connect_type = port_dev->connect_type; |
| if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
| u16 mask = 1 << i; |
| |
| if (!(port_removable & mask)) { |
| dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
| port_removable |= mask; |
| } |
| } |
| } |
| |
| desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); |
| } |
| } |
| |
| #ifdef CONFIG_ACPI |
| /** |
| * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle |
| * @hdev: USB device belonging to the usb hub |
| * @port1: port num of the port |
| * |
| * Return: Port's acpi handle if successful, %NULL if params are |
| * invalid. |
| */ |
| acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, |
| int port1) |
| { |
| struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
| |
| if (!hub) |
| return NULL; |
| |
| return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); |
| } |
| #endif |
