drivers/usb/wusbcore/wusbhc.c - arm/linux - Git at Google

 /*
  * Wireless USB Host Controller
  * sysfs glue, wusbcore module support and life cycle management
  *
  *
  * Copyright (C) 2005-2006 Intel Corporation
  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License version
  * 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
  *
  *
  * Creation/destruction of wusbhc is split in two parts; that that
  * doesn't require the HCD to be added (wusbhc_{create,destroy}) and
  * the one that requires (phase B, wusbhc_b_{create,destroy}).
  *
  * This is so because usb_add_hcd() will start the HC, and thus, all
  * the HC specific stuff has to be already initialized (like sysfs
  * thingies).
  */
 #include <linux/device.h>
 #include <linux/module.h>
 #include "wusbhc.h"

 /**
  * Extract the wusbhc that corresponds to a USB Host Controller class device
  *
  * WARNING! Apply only if @dev is that of a
  *          wusbhc.usb_hcd.self->class_dev; otherwise, you loose.
  */
 static struct wusbhc *usbhc_dev_to_wusbhc(struct device *dev)
 {
 	struct usb_bus *usb_bus = dev_get_drvdata(dev);
 	struct usb_hcd *usb_hcd = bus_to_hcd(usb_bus);
 	return usb_hcd_to_wusbhc(usb_hcd);
 }

 /*
  * Show & store the current WUSB trust timeout
  *
  * We don't do locking--it is an 'atomic' value.
  *
  * The units that we store/show are always MILLISECONDS. However, the
  * value of trust_timeout is jiffies.
  */
 static ssize_t wusb_trust_timeout_show(struct device *dev,
 					struct device_attribute *attr,
 					char *buf)
 {
 	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);

 	return scnprintf(buf, PAGE_SIZE, "%u\n", wusbhc->trust_timeout);
 }

 static ssize_t wusb_trust_timeout_store(struct device *dev,
 					struct device_attribute *attr,
 					const char *buf, size_t size)
 {
 	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
 	ssize_t result = -ENOSYS;
 	unsigned trust_timeout;

 	result = sscanf(buf, "%u", &trust_timeout);
 	if (result != 1) {
 		result = -EINVAL;
 		goto out;
 	}
 	wusbhc->trust_timeout = min_t(unsigned, trust_timeout, 500);
 	cancel_delayed_work(&wusbhc->keep_alive_timer);
 	flush_workqueue(wusbd);
 	queue_delayed_work(wusbd, &wusbhc->keep_alive_timer,
 			   msecs_to_jiffies(wusbhc->trust_timeout / 2));
 out:
 	return result < 0 ? result : size;
 }
 static DEVICE_ATTR_RW(wusb_trust_timeout);

 /*
  * Show the current WUSB CHID.
  */
 static ssize_t wusb_chid_show(struct device *dev,
 			      struct device_attribute *attr, char *buf)
 {
 	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
 	const struct wusb_ckhdid *chid;
 	ssize_t result = 0;

 	if (wusbhc->wuie_host_info != NULL)
 		chid = &wusbhc->wuie_host_info->CHID;
 	else
 		chid = &wusb_ckhdid_zero;

 	result += ckhdid_printf(buf, PAGE_SIZE, chid);
 	result += sprintf(buf + result, "\n");

 	return result;
 }

 /*
  * Store a new CHID.
  *
  * - Write an all zeros CHID and it will stop the controller
  * - Write a non-zero CHID and it will start it.
  *
  * See wusbhc_chid_set() for more info.
  */
 static ssize_t wusb_chid_store(struct device *dev,
 			       struct device_attribute *attr,
 			       const char *buf, size_t size)
 {
 	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
 	struct wusb_ckhdid chid;
 	ssize_t result;

 	result = sscanf(buf,
 			"%02hhx %02hhx %02hhx %02hhx "
 			"%02hhx %02hhx %02hhx %02hhx "
 			"%02hhx %02hhx %02hhx %02hhx "
 			"%02hhx %02hhx %02hhx %02hhx\n",
 			&chid.data[0] , &chid.data[1] ,
 			&chid.data[2] , &chid.data[3] ,
 			&chid.data[4] , &chid.data[5] ,
 			&chid.data[6] , &chid.data[7] ,
 			&chid.data[8] , &chid.data[9] ,
 			&chid.data[10], &chid.data[11],
 			&chid.data[12], &chid.data[13],
 			&chid.data[14], &chid.data[15]);
 	if (result != 16) {
 		dev_err(dev, "Unrecognized CHID (need 16 8-bit hex digits): "
 			"%d\n", (int)result);
 		return -EINVAL;
 	}
 	result = wusbhc_chid_set(wusbhc, &chid);
 	return result < 0 ? result : size;
 }
 static DEVICE_ATTR_RW(wusb_chid);


 static ssize_t wusb_phy_rate_show(struct device *dev,
 				  struct device_attribute *attr,
 				  char *buf)
 {
 	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);

 	return sprintf(buf, "%d\n", wusbhc->phy_rate);
 }

 static ssize_t wusb_phy_rate_store(struct device *dev,
 				   struct device_attribute *attr,
 				   const char *buf, size_t size)
 {
 	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
 	uint8_t phy_rate;
 	ssize_t result;

 	result = sscanf(buf, "%hhu", &phy_rate);
 	if (result != 1)
 		return -EINVAL;
 	if (phy_rate >= UWB_PHY_RATE_INVALID)
 		return -EINVAL;

 	wusbhc->phy_rate = phy_rate;
 	return size;
 }
 static DEVICE_ATTR_RW(wusb_phy_rate);

 static ssize_t wusb_dnts_show(struct device *dev,
 				  struct device_attribute *attr,
 				  char *buf)
 {
 	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);

 	return sprintf(buf, "num slots: %d\ninterval: %dms\n",
 			wusbhc->dnts_num_slots, wusbhc->dnts_interval);
 }

 static ssize_t wusb_dnts_store(struct device *dev,
 				   struct device_attribute *attr,
 				   const char *buf, size_t size)
 {
 	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
 	uint8_t num_slots, interval;
 	ssize_t result;

 	result = sscanf(buf, "%hhu %hhu", &num_slots, &interval);

 	if (result != 2)
 		return -EINVAL;

 	wusbhc->dnts_num_slots = num_slots;
 	wusbhc->dnts_interval = interval;

 	return size;
 }
 static DEVICE_ATTR_RW(wusb_dnts);

 static ssize_t wusb_retry_count_show(struct device *dev,
 				  struct device_attribute *attr,
 				  char *buf)
 {
 	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);

 	return sprintf(buf, "%d\n", wusbhc->retry_count);
 }

 static ssize_t wusb_retry_count_store(struct device *dev,
 				   struct device_attribute *attr,
 				   const char *buf, size_t size)
 {
 	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
 	uint8_t retry_count;
 	ssize_t result;

 	result = sscanf(buf, "%hhu", &retry_count);

 	if (result != 1)
 		return -EINVAL;

 	wusbhc->retry_count = max_t(uint8_t, retry_count,
 					WUSB_RETRY_COUNT_MAX);

 	return size;
 }
 static DEVICE_ATTR_RW(wusb_retry_count);

 /* Group all the WUSBHC attributes */
 static struct attribute *wusbhc_attrs[] = {
 		&dev_attr_wusb_trust_timeout.attr,
 		&dev_attr_wusb_chid.attr,
 		&dev_attr_wusb_phy_rate.attr,
 		&dev_attr_wusb_dnts.attr,
 		&dev_attr_wusb_retry_count.attr,
 		NULL,
 };

 static struct attribute_group wusbhc_attr_group = {
 	.name = NULL,	/* we want them in the same directory */
 	.attrs = wusbhc_attrs,
 };

 /*
  * Create a wusbhc instance
  *
  * NOTEs:
  *
  *  - assumes *wusbhc has been zeroed and wusbhc->usb_hcd has been
  *    initialized but not added.
  *
  *  - fill out ports_max, mmcies_max and mmcie_{add,rm} before calling.
  *
  *  - fill out wusbhc->uwb_rc and refcount it before calling
  *  - fill out the wusbhc->sec_modes array
  */
 int wusbhc_create(struct wusbhc *wusbhc)
 {
 	int result = 0;

 	/* set defaults.  These can be overwritten using sysfs attributes. */
 	wusbhc->trust_timeout = WUSB_TRUST_TIMEOUT_MS;
 	wusbhc->phy_rate = UWB_PHY_RATE_INVALID - 1;
 	wusbhc->dnts_num_slots = 4;
 	wusbhc->dnts_interval = 2;
 	wusbhc->retry_count = WUSB_RETRY_COUNT_INFINITE;

 	mutex_init(&wusbhc->mutex);
 	result = wusbhc_mmcie_create(wusbhc);
 	if (result < 0)
 		goto error_mmcie_create;
 	result = wusbhc_devconnect_create(wusbhc);
 	if (result < 0)
 		goto error_devconnect_create;
 	result = wusbhc_rh_create(wusbhc);
 	if (result < 0)
 		goto error_rh_create;
 	result = wusbhc_sec_create(wusbhc);
 	if (result < 0)
 		goto error_sec_create;
 	return 0;

 error_sec_create:
 	wusbhc_rh_destroy(wusbhc);
 error_rh_create:
 	wusbhc_devconnect_destroy(wusbhc);
 error_devconnect_create:
 	wusbhc_mmcie_destroy(wusbhc);
 error_mmcie_create:
 	return result;
 }
 EXPORT_SYMBOL_GPL(wusbhc_create);

 static inline struct kobject *wusbhc_kobj(struct wusbhc *wusbhc)
 {
 	return &wusbhc->usb_hcd.self.controller->kobj;
 }

 /*
  * Phase B of a wusbhc instance creation
  *
  * Creates fields that depend on wusbhc->usb_hcd having been
  * added. This is where we create the sysfs files in
  * /sys/class/usb_host/usb_hostX/.
  *
  * NOTE: Assumes wusbhc->usb_hcd has been already added by the upper
  *       layer (hwahc or whci)
  */
 int wusbhc_b_create(struct wusbhc *wusbhc)
 {
 	int result = 0;
 	struct device *dev = wusbhc->usb_hcd.self.controller;

 	result = sysfs_create_group(wusbhc_kobj(wusbhc), &wusbhc_attr_group);
 	if (result < 0) {
 		dev_err(dev, "Cannot register WUSBHC attributes: %d\n",
 			result);
 		goto error_create_attr_group;
 	}

 	return 0;
 error_create_attr_group:
 	return result;
 }
 EXPORT_SYMBOL_GPL(wusbhc_b_create);

 void wusbhc_b_destroy(struct wusbhc *wusbhc)
 {
 	wusbhc_pal_unregister(wusbhc);
 	sysfs_remove_group(wusbhc_kobj(wusbhc), &wusbhc_attr_group);
 }
 EXPORT_SYMBOL_GPL(wusbhc_b_destroy);

 void wusbhc_destroy(struct wusbhc *wusbhc)
 {
 	wusbhc_sec_destroy(wusbhc);
 	wusbhc_rh_destroy(wusbhc);
 	wusbhc_devconnect_destroy(wusbhc);
 	wusbhc_mmcie_destroy(wusbhc);
 }
 EXPORT_SYMBOL_GPL(wusbhc_destroy);

 struct workqueue_struct *wusbd;
 EXPORT_SYMBOL_GPL(wusbd);

 /*
  * WUSB Cluster ID allocation map
  *
  * Each WUSB bus in a channel is identified with a Cluster Id in the
  * unauth address pace (WUSB1.0[4.3]). We take the range 0xe0 to 0xff
  * (that's space for 31 WUSB controllers, as 0xff can't be taken). We
  * start taking from 0xff, 0xfe, 0xfd... (hence the += or -= 0xff).
  *
  * For each one we taken, we pin it in the bitap
  */
 #define CLUSTER_IDS 32
 static DECLARE_BITMAP(wusb_cluster_id_table, CLUSTER_IDS);
 static DEFINE_SPINLOCK(wusb_cluster_ids_lock);

 /*
  * Get a WUSB Cluster ID
  *
  * Need to release with wusb_cluster_id_put() when done w/ it.
  */
 /* FIXME: coordinate with the choose_addres() from the USB stack */
 /* we want to leave the top of the 128 range for cluster addresses and
  * the bottom for device addresses (as we map them one on one with
  * ports). */
 u8 wusb_cluster_id_get(void)
 {
 	u8 id;
 	spin_lock(&wusb_cluster_ids_lock);
 	id = find_first_zero_bit(wusb_cluster_id_table, CLUSTER_IDS);
 	if (id >= CLUSTER_IDS) {
 		id = 0;
 		goto out;
 	}
 	set_bit(id, wusb_cluster_id_table);
 	id = (u8) 0xff - id;
 out:
 	spin_unlock(&wusb_cluster_ids_lock);
 	return id;

 }
 EXPORT_SYMBOL_GPL(wusb_cluster_id_get);

 /*
  * Release a WUSB Cluster ID
  *
  * Obtained it with wusb_cluster_id_get()
  */
 void wusb_cluster_id_put(u8 id)
 {
 	id = 0xff - id;
 	BUG_ON(id >= CLUSTER_IDS);
 	spin_lock(&wusb_cluster_ids_lock);
 	WARN_ON(!test_bit(id, wusb_cluster_id_table));
 	clear_bit(id, wusb_cluster_id_table);
 	spin_unlock(&wusb_cluster_ids_lock);
 }
 EXPORT_SYMBOL_GPL(wusb_cluster_id_put);

 /**
  * wusbhc_giveback_urb - return an URB to the USB core
  * @wusbhc: the host controller the URB is from.
  * @urb:    the URB.
  * @status: the URB's status.
  *
  * Return an URB to the USB core doing some additional WUSB specific
  * processing.
  *
  *  - After a successful transfer, update the trust timeout timestamp
  *    for the WUSB device.
  *
  *  - [WUSB] sections 4.13 and 7.5.1 specify the stop retransmission
  *    condition for the WCONNECTACK_IE is that the host has observed
  *    the associated device responding to a control transfer.
  */
 void wusbhc_giveback_urb(struct wusbhc *wusbhc, struct urb *urb, int status)
 {
 	struct wusb_dev *wusb_dev = __wusb_dev_get_by_usb_dev(wusbhc,
 					urb->dev);

 	if (status == 0 && wusb_dev) {
 		wusb_dev->entry_ts = jiffies;

 		/* wusbhc_devconnect_acked() can't be called from
 		   atomic context so defer it to a work queue. */
 		if (!list_empty(&wusb_dev->cack_node))
 			queue_work(wusbd, &wusb_dev->devconnect_acked_work);
 		else
 			wusb_dev_put(wusb_dev);
 	}

 	usb_hcd_giveback_urb(&wusbhc->usb_hcd, urb, status);
 }
 EXPORT_SYMBOL_GPL(wusbhc_giveback_urb);

 /**
  * wusbhc_reset_all - reset the HC hardware
  * @wusbhc: the host controller to reset.
  *
  * Request a full hardware reset of the chip.  This will also reset
  * the radio controller and any other PALs.
  */
 void wusbhc_reset_all(struct wusbhc *wusbhc)
 {
 	if (wusbhc->uwb_rc)
 		uwb_rc_reset_all(wusbhc->uwb_rc);
 }
 EXPORT_SYMBOL_GPL(wusbhc_reset_all);

 static struct notifier_block wusb_usb_notifier = {
 	.notifier_call = wusb_usb_ncb,
 	.priority = INT_MAX	/* Need to be called first of all */
 };

 static int __init wusbcore_init(void)
 {
 	int result;
 	result = wusb_crypto_init();
 	if (result < 0)
 		goto error_crypto_init;
 	/* WQ is singlethread because we need to serialize notifications */
 	wusbd = create_singlethread_workqueue("wusbd");
 	if (wusbd == NULL) {
 		result = -ENOMEM;
 		printk(KERN_ERR "WUSB-core: Cannot create wusbd workqueue\n");
 		goto error_wusbd_create;
 	}
 	usb_register_notify(&wusb_usb_notifier);
 	bitmap_zero(wusb_cluster_id_table, CLUSTER_IDS);
 	set_bit(0, wusb_cluster_id_table);	/* reserve Cluster ID 0xff */
 	return 0;

 error_wusbd_create:
 	wusb_crypto_exit();
 error_crypto_init:
 	return result;

 }
 module_init(wusbcore_init);

 static void __exit wusbcore_exit(void)
 {
 	clear_bit(0, wusb_cluster_id_table);
 	if (!bitmap_empty(wusb_cluster_id_table, CLUSTER_IDS)) {
 		printk(KERN_ERR "BUG: WUSB Cluster IDs not released on exit: %*pb\n",
 		       CLUSTER_IDS, wusb_cluster_id_table);
 		WARN_ON(1);
 	}
 	usb_unregister_notify(&wusb_usb_notifier);
 	destroy_workqueue(wusbd);
 	wusb_crypto_exit();
 }
 module_exit(wusbcore_exit);

 MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
 MODULE_DESCRIPTION("Wireless USB core");
 MODULE_LICENSE("GPL");
	/*
	* Wireless USB Host Controller
	* sysfs glue, wusbcore module support and life cycle management
	*
	*
	* Copyright (C) 2005-2006 Intel Corporation
	* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License version
	* 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	* 02110-1301, USA.
	*
	*
	* Creation/destruction of wusbhc is split in two parts; that that
	* doesn't require the HCD to be added (wusbhc_{create,destroy}) and
	* the one that requires (phase B, wusbhc_b_{create,destroy}).
	*
	* This is so because usb_add_hcd() will start the HC, and thus, all
	* the HC specific stuff has to be already initialized (like sysfs
	* thingies).
	*/
	#include <linux/device.h>
	#include <linux/module.h>
	#include "wusbhc.h"

	/**
	* Extract the wusbhc that corresponds to a USB Host Controller class device
	*
	* WARNING! Apply only if @dev is that of a
	* wusbhc.usb_hcd.self->class_dev; otherwise, you loose.
	*/
	static struct wusbhc usbhc_dev_to_wusbhc(struct device dev)
	{
	struct usb_bus *usb_bus = dev_get_drvdata(dev);
	struct usb_hcd *usb_hcd = bus_to_hcd(usb_bus);
	return usb_hcd_to_wusbhc(usb_hcd);
	}

	/*
	* Show & store the current WUSB trust timeout
	*
	* We don't do locking--it is an 'atomic' value.
	*
	* The units that we store/show are always MILLISECONDS. However, the
	* value of trust_timeout is jiffies.
	*/
	static ssize_t wusb_trust_timeout_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);

	return scnprintf(buf, PAGE_SIZE, "%u\n", wusbhc->trust_timeout);
	}

	static ssize_t wusb_trust_timeout_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
	ssize_t result = -ENOSYS;
	unsigned trust_timeout;

	result = sscanf(buf, "%u", &trust_timeout);
	if (result != 1) {
	result = -EINVAL;
	goto out;
	}
	wusbhc->trust_timeout = min_t(unsigned, trust_timeout, 500);
	cancel_delayed_work(&wusbhc->keep_alive_timer);
	flush_workqueue(wusbd);
	queue_delayed_work(wusbd, &wusbhc->keep_alive_timer,
	msecs_to_jiffies(wusbhc->trust_timeout / 2));
	out:
	return result < 0 ? result : size;
	}
	static DEVICE_ATTR_RW(wusb_trust_timeout);

	/*
	* Show the current WUSB CHID.
	*/
	static ssize_t wusb_chid_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
	const struct wusb_ckhdid *chid;
	ssize_t result = 0;

	if (wusbhc->wuie_host_info != NULL)
	chid = &wusbhc->wuie_host_info->CHID;
	else
	chid = &wusb_ckhdid_zero;

	result += ckhdid_printf(buf, PAGE_SIZE, chid);
	result += sprintf(buf + result, "\n");

	return result;
	}

	/*
	* Store a new CHID.
	*
	* - Write an all zeros CHID and it will stop the controller
	* - Write a non-zero CHID and it will start it.
	*
	* See wusbhc_chid_set() for more info.
	*/
	static ssize_t wusb_chid_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
	struct wusb_ckhdid chid;
	ssize_t result;

	result = sscanf(buf,
	"%02hhx %02hhx %02hhx %02hhx "
	"%02hhx %02hhx %02hhx %02hhx "
	"%02hhx %02hhx %02hhx %02hhx "
	"%02hhx %02hhx %02hhx %02hhx\n",
	&chid.data[0] , &chid.data[1] ,
	&chid.data[2] , &chid.data[3] ,
	&chid.data[4] , &chid.data[5] ,
	&chid.data[6] , &chid.data[7] ,
	&chid.data[8] , &chid.data[9] ,
	&chid.data[10], &chid.data[11],
	&chid.data[12], &chid.data[13],
	&chid.data[14], &chid.data[15]);
	if (result != 16) {
	dev_err(dev, "Unrecognized CHID (need 16 8-bit hex digits): "
	"%d\n", (int)result);
	return -EINVAL;
	}
	result = wusbhc_chid_set(wusbhc, &chid);
	return result < 0 ? result : size;
	}
	static DEVICE_ATTR_RW(wusb_chid);


	static ssize_t wusb_phy_rate_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);

	return sprintf(buf, "%d\n", wusbhc->phy_rate);
	}

	static ssize_t wusb_phy_rate_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
	uint8_t phy_rate;
	ssize_t result;

	result = sscanf(buf, "%hhu", &phy_rate);
	if (result != 1)
	return -EINVAL;
	if (phy_rate >= UWB_PHY_RATE_INVALID)
	return -EINVAL;

	wusbhc->phy_rate = phy_rate;
	return size;
	}
	static DEVICE_ATTR_RW(wusb_phy_rate);

	static ssize_t wusb_dnts_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);

	return sprintf(buf, "num slots: %d\ninterval: %dms\n",
	wusbhc->dnts_num_slots, wusbhc->dnts_interval);
	}

	static ssize_t wusb_dnts_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
	uint8_t num_slots, interval;
	ssize_t result;

	result = sscanf(buf, "%hhu %hhu", &num_slots, &interval);

	if (result != 2)
	return -EINVAL;

	wusbhc->dnts_num_slots = num_slots;
	wusbhc->dnts_interval = interval;

	return size;
	}
	static DEVICE_ATTR_RW(wusb_dnts);

	static ssize_t wusb_retry_count_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);

	return sprintf(buf, "%d\n", wusbhc->retry_count);
	}

	static ssize_t wusb_retry_count_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
	uint8_t retry_count;
	ssize_t result;

	result = sscanf(buf, "%hhu", &retry_count);

	if (result != 1)
	return -EINVAL;

	wusbhc->retry_count = max_t(uint8_t, retry_count,
	WUSB_RETRY_COUNT_MAX);

	return size;
	}
	static DEVICE_ATTR_RW(wusb_retry_count);

	/* Group all the WUSBHC attributes */
	static struct attribute *wusbhc_attrs[] = {
	&dev_attr_wusb_trust_timeout.attr,
	&dev_attr_wusb_chid.attr,
	&dev_attr_wusb_phy_rate.attr,
	&dev_attr_wusb_dnts.attr,
	&dev_attr_wusb_retry_count.attr,
	NULL,
	};

	static struct attribute_group wusbhc_attr_group = {
	.name = NULL, /* we want them in the same directory */
	.attrs = wusbhc_attrs,
	};

	/*
	* Create a wusbhc instance
	*
	* NOTEs:
	*
	* - assumes *wusbhc has been zeroed and wusbhc->usb_hcd has been
	* initialized but not added.
	*
	* - fill out ports_max, mmcies_max and mmcie_{add,rm} before calling.
	*
	* - fill out wusbhc->uwb_rc and refcount it before calling
	* - fill out the wusbhc->sec_modes array
	*/
	int wusbhc_create(struct wusbhc *wusbhc)
	{
	int result = 0;

	/* set defaults. These can be overwritten using sysfs attributes. */
	wusbhc->trust_timeout = WUSB_TRUST_TIMEOUT_MS;
	wusbhc->phy_rate = UWB_PHY_RATE_INVALID - 1;
	wusbhc->dnts_num_slots = 4;
	wusbhc->dnts_interval = 2;
	wusbhc->retry_count = WUSB_RETRY_COUNT_INFINITE;

	mutex_init(&wusbhc->mutex);
	result = wusbhc_mmcie_create(wusbhc);
	if (result < 0)
	goto error_mmcie_create;
	result = wusbhc_devconnect_create(wusbhc);
	if (result < 0)
	goto error_devconnect_create;
	result = wusbhc_rh_create(wusbhc);
	if (result < 0)
	goto error_rh_create;
	result = wusbhc_sec_create(wusbhc);
	if (result < 0)
	goto error_sec_create;
	return 0;

	error_sec_create:
	wusbhc_rh_destroy(wusbhc);
	error_rh_create:
	wusbhc_devconnect_destroy(wusbhc);
	error_devconnect_create:
	wusbhc_mmcie_destroy(wusbhc);
	error_mmcie_create:
	return result;
	}
	EXPORT_SYMBOL_GPL(wusbhc_create);

	static inline struct kobject wusbhc_kobj(struct wusbhc wusbhc)
	{
	return &wusbhc->usb_hcd.self.controller->kobj;
	}

	/*
	* Phase B of a wusbhc instance creation
	*
	* Creates fields that depend on wusbhc->usb_hcd having been
	* added. This is where we create the sysfs files in
	* /sys/class/usb_host/usb_hostX/.
	*
	* NOTE: Assumes wusbhc->usb_hcd has been already added by the upper
	* layer (hwahc or whci)
	*/
	int wusbhc_b_create(struct wusbhc *wusbhc)
	{
	int result = 0;
	struct device *dev = wusbhc->usb_hcd.self.controller;

	result = sysfs_create_group(wusbhc_kobj(wusbhc), &wusbhc_attr_group);
	if (result < 0) {
	dev_err(dev, "Cannot register WUSBHC attributes: %d\n",
	result);
	goto error_create_attr_group;
	}

	return 0;
	error_create_attr_group:
	return result;
	}
	EXPORT_SYMBOL_GPL(wusbhc_b_create);

	void wusbhc_b_destroy(struct wusbhc *wusbhc)
	{
	wusbhc_pal_unregister(wusbhc);
	sysfs_remove_group(wusbhc_kobj(wusbhc), &wusbhc_attr_group);
	}
	EXPORT_SYMBOL_GPL(wusbhc_b_destroy);

	void wusbhc_destroy(struct wusbhc *wusbhc)
	{
	wusbhc_sec_destroy(wusbhc);
	wusbhc_rh_destroy(wusbhc);
	wusbhc_devconnect_destroy(wusbhc);
	wusbhc_mmcie_destroy(wusbhc);
	}
	EXPORT_SYMBOL_GPL(wusbhc_destroy);

	struct workqueue_struct *wusbd;
	EXPORT_SYMBOL_GPL(wusbd);

	/*
	* WUSB Cluster ID allocation map
	*
	* Each WUSB bus in a channel is identified with a Cluster Id in the
	* unauth address pace (WUSB1.0[4.3]). We take the range 0xe0 to 0xff
	* (that's space for 31 WUSB controllers, as 0xff can't be taken). We
	* start taking from 0xff, 0xfe, 0xfd... (hence the += or -= 0xff).
	*
	* For each one we taken, we pin it in the bitap
	*/
	#define CLUSTER_IDS 32
	static DECLARE_BITMAP(wusb_cluster_id_table, CLUSTER_IDS);
	static DEFINE_SPINLOCK(wusb_cluster_ids_lock);

	/*
	* Get a WUSB Cluster ID
	*
	* Need to release with wusb_cluster_id_put() when done w/ it.
	*/
	/* FIXME: coordinate with the choose_addres() from the USB stack */
	/* we want to leave the top of the 128 range for cluster addresses and
	* the bottom for device addresses (as we map them one on one with
	* ports). */
	u8 wusb_cluster_id_get(void)
	{
	u8 id;
	spin_lock(&wusb_cluster_ids_lock);
	id = find_first_zero_bit(wusb_cluster_id_table, CLUSTER_IDS);
	if (id >= CLUSTER_IDS) {
	id = 0;
	goto out;
	}
	set_bit(id, wusb_cluster_id_table);
	id = (u8) 0xff - id;
	out:
	spin_unlock(&wusb_cluster_ids_lock);
	return id;

	}
	EXPORT_SYMBOL_GPL(wusb_cluster_id_get);

	/*
	* Release a WUSB Cluster ID
	*
	* Obtained it with wusb_cluster_id_get()
	*/
	void wusb_cluster_id_put(u8 id)
	{
	id = 0xff - id;
	BUG_ON(id >= CLUSTER_IDS);
	spin_lock(&wusb_cluster_ids_lock);
	WARN_ON(!test_bit(id, wusb_cluster_id_table));
	clear_bit(id, wusb_cluster_id_table);
	spin_unlock(&wusb_cluster_ids_lock);
	}
	EXPORT_SYMBOL_GPL(wusb_cluster_id_put);

	/**
	* wusbhc_giveback_urb - return an URB to the USB core
	* @wusbhc: the host controller the URB is from.
	* @urb: the URB.
	* @status: the URB's status.
	*
	* Return an URB to the USB core doing some additional WUSB specific
	* processing.
	*
	* - After a successful transfer, update the trust timeout timestamp
	* for the WUSB device.
	*
	* - [WUSB] sections 4.13 and 7.5.1 specify the stop retransmission
	* condition for the WCONNECTACK_IE is that the host has observed
	* the associated device responding to a control transfer.
	*/
	void wusbhc_giveback_urb(struct wusbhc wusbhc, struct urb urb, int status)
	{
	struct wusb_dev *wusb_dev = __wusb_dev_get_by_usb_dev(wusbhc,
	urb->dev);

	if (status == 0 && wusb_dev) {
	wusb_dev->entry_ts = jiffies;

	/* wusbhc_devconnect_acked() can't be called from
	atomic context so defer it to a work queue. */
	if (!list_empty(&wusb_dev->cack_node))
	queue_work(wusbd, &wusb_dev->devconnect_acked_work);
	else
	wusb_dev_put(wusb_dev);
	}

	usb_hcd_giveback_urb(&wusbhc->usb_hcd, urb, status);
	}
	EXPORT_SYMBOL_GPL(wusbhc_giveback_urb);

	/**
	* wusbhc_reset_all - reset the HC hardware
	* @wusbhc: the host controller to reset.
	*
	* Request a full hardware reset of the chip. This will also reset
	* the radio controller and any other PALs.
	*/
	void wusbhc_reset_all(struct wusbhc *wusbhc)
	{
	if (wusbhc->uwb_rc)
	uwb_rc_reset_all(wusbhc->uwb_rc);
	}
	EXPORT_SYMBOL_GPL(wusbhc_reset_all);

	static struct notifier_block wusb_usb_notifier = {
	.notifier_call = wusb_usb_ncb,
	.priority = INT_MAX /* Need to be called first of all */
	};

	static int __init wusbcore_init(void)
	{
	int result;
	result = wusb_crypto_init();
	if (result < 0)
	goto error_crypto_init;
	/* WQ is singlethread because we need to serialize notifications */
	wusbd = create_singlethread_workqueue("wusbd");
	if (wusbd == NULL) {
	result = -ENOMEM;
	printk(KERN_ERR "WUSB-core: Cannot create wusbd workqueue\n");
	goto error_wusbd_create;
	}
	usb_register_notify(&wusb_usb_notifier);
	bitmap_zero(wusb_cluster_id_table, CLUSTER_IDS);
	set_bit(0, wusb_cluster_id_table); /* reserve Cluster ID 0xff */
	return 0;

	error_wusbd_create:
	wusb_crypto_exit();
	error_crypto_init:
	return result;

	}
	module_init(wusbcore_init);

	static void __exit wusbcore_exit(void)
	{
	clear_bit(0, wusb_cluster_id_table);
	if (!bitmap_empty(wusb_cluster_id_table, CLUSTER_IDS)) {
	printk(KERN_ERR "BUG: WUSB Cluster IDs not released on exit: %*pb\n",
	CLUSTER_IDS, wusb_cluster_id_table);
	WARN_ON(1);
	}
	usb_unregister_notify(&wusb_usb_notifier);
	destroy_workqueue(wusbd);
	wusb_crypto_exit();
	}
	module_exit(wusbcore_exit);

	MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
	MODULE_DESCRIPTION("Wireless USB core");
	MODULE_LICENSE("GPL");