| /********************************************************************* |
| * |
| * Filename: ircomm_tty.c |
| * Version: 1.0 |
| * Description: IrCOMM serial TTY driver |
| * Status: Experimental. |
| * Author: Dag Brattli <dagb@cs.uit.no> |
| * Created at: Sun Jun 6 21:00:56 1999 |
| * Modified at: Wed Feb 23 00:09:02 2000 |
| * Modified by: Dag Brattli <dagb@cs.uit.no> |
| * Sources: serial.c and previous IrCOMM work by Takahide Higuchi |
| * |
| * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved. |
| * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * 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., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| * |
| ********************************************************************/ |
| |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/fs.h> |
| #include <linux/sched.h> |
| #include <linux/termios.h> |
| #include <linux/tty.h> |
| #include <linux/interrupt.h> |
| #include <linux/device.h> /* for MODULE_ALIAS_CHARDEV_MAJOR */ |
| |
| #include <asm/uaccess.h> |
| |
| #include <net/irda/irda.h> |
| #include <net/irda/irmod.h> |
| |
| #include <net/irda/ircomm_core.h> |
| #include <net/irda/ircomm_param.h> |
| #include <net/irda/ircomm_tty_attach.h> |
| #include <net/irda/ircomm_tty.h> |
| |
| static int ircomm_tty_open(struct tty_struct *tty, struct file *filp); |
| static void ircomm_tty_close(struct tty_struct * tty, struct file *filp); |
| static int ircomm_tty_write(struct tty_struct * tty, |
| const unsigned char *buf, int count); |
| static int ircomm_tty_write_room(struct tty_struct *tty); |
| static void ircomm_tty_throttle(struct tty_struct *tty); |
| static void ircomm_tty_unthrottle(struct tty_struct *tty); |
| static int ircomm_tty_chars_in_buffer(struct tty_struct *tty); |
| static void ircomm_tty_flush_buffer(struct tty_struct *tty); |
| static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch); |
| static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout); |
| static void ircomm_tty_hangup(struct tty_struct *tty); |
| static void ircomm_tty_do_softint(struct work_struct *work); |
| static void ircomm_tty_shutdown(struct ircomm_tty_cb *self); |
| static void ircomm_tty_stop(struct tty_struct *tty); |
| |
| static int ircomm_tty_data_indication(void *instance, void *sap, |
| struct sk_buff *skb); |
| static int ircomm_tty_control_indication(void *instance, void *sap, |
| struct sk_buff *skb); |
| static void ircomm_tty_flow_indication(void *instance, void *sap, |
| LOCAL_FLOW cmd); |
| #ifdef CONFIG_PROC_FS |
| static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len, |
| int *eof, void *unused); |
| #endif /* CONFIG_PROC_FS */ |
| static struct tty_driver *driver; |
| |
| static hashbin_t *ircomm_tty = NULL; |
| |
| static const struct tty_operations ops = { |
| .open = ircomm_tty_open, |
| .close = ircomm_tty_close, |
| .write = ircomm_tty_write, |
| .write_room = ircomm_tty_write_room, |
| .chars_in_buffer = ircomm_tty_chars_in_buffer, |
| .flush_buffer = ircomm_tty_flush_buffer, |
| .ioctl = ircomm_tty_ioctl, /* ircomm_tty_ioctl.c */ |
| .tiocmget = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */ |
| .tiocmset = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */ |
| .throttle = ircomm_tty_throttle, |
| .unthrottle = ircomm_tty_unthrottle, |
| .send_xchar = ircomm_tty_send_xchar, |
| .set_termios = ircomm_tty_set_termios, |
| .stop = ircomm_tty_stop, |
| .start = ircomm_tty_start, |
| .hangup = ircomm_tty_hangup, |
| .wait_until_sent = ircomm_tty_wait_until_sent, |
| #ifdef CONFIG_PROC_FS |
| .read_proc = ircomm_tty_read_proc, |
| #endif /* CONFIG_PROC_FS */ |
| }; |
| |
| /* |
| * Function ircomm_tty_init() |
| * |
| * Init IrCOMM TTY layer/driver |
| * |
| */ |
| static int __init ircomm_tty_init(void) |
| { |
| driver = alloc_tty_driver(IRCOMM_TTY_PORTS); |
| if (!driver) |
| return -ENOMEM; |
| ircomm_tty = hashbin_new(HB_LOCK); |
| if (ircomm_tty == NULL) { |
| IRDA_ERROR("%s(), can't allocate hashbin!\n", __FUNCTION__); |
| put_tty_driver(driver); |
| return -ENOMEM; |
| } |
| |
| driver->owner = THIS_MODULE; |
| driver->driver_name = "ircomm"; |
| driver->name = "ircomm"; |
| driver->major = IRCOMM_TTY_MAJOR; |
| driver->minor_start = IRCOMM_TTY_MINOR; |
| driver->type = TTY_DRIVER_TYPE_SERIAL; |
| driver->subtype = SERIAL_TYPE_NORMAL; |
| driver->init_termios = tty_std_termios; |
| driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| driver->flags = TTY_DRIVER_REAL_RAW; |
| tty_set_operations(driver, &ops); |
| if (tty_register_driver(driver)) { |
| IRDA_ERROR("%s(): Couldn't register serial driver\n", |
| __FUNCTION__); |
| put_tty_driver(driver); |
| return -1; |
| } |
| return 0; |
| } |
| |
| static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self) |
| { |
| IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| |
| ircomm_tty_shutdown(self); |
| |
| self->magic = 0; |
| kfree(self); |
| } |
| |
| /* |
| * Function ircomm_tty_cleanup () |
| * |
| * Remove IrCOMM TTY layer/driver |
| * |
| */ |
| static void __exit ircomm_tty_cleanup(void) |
| { |
| int ret; |
| |
| IRDA_DEBUG(4, "%s()\n", __FUNCTION__ ); |
| |
| ret = tty_unregister_driver(driver); |
| if (ret) { |
| IRDA_ERROR("%s(), failed to unregister driver\n", |
| __FUNCTION__); |
| return; |
| } |
| |
| hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup); |
| put_tty_driver(driver); |
| } |
| |
| /* |
| * Function ircomm_startup (self) |
| * |
| * |
| * |
| */ |
| static int ircomm_tty_startup(struct ircomm_tty_cb *self) |
| { |
| notify_t notify; |
| int ret = -ENODEV; |
| |
| IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| |
| IRDA_ASSERT(self != NULL, return -1;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| |
| /* Check if already open */ |
| if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) { |
| IRDA_DEBUG(2, "%s(), already open so break out!\n", __FUNCTION__ ); |
| return 0; |
| } |
| |
| /* Register with IrCOMM */ |
| irda_notify_init(¬ify); |
| /* These callbacks we must handle ourselves */ |
| notify.data_indication = ircomm_tty_data_indication; |
| notify.udata_indication = ircomm_tty_control_indication; |
| notify.flow_indication = ircomm_tty_flow_indication; |
| |
| /* Use the ircomm_tty interface for these ones */ |
| notify.disconnect_indication = ircomm_tty_disconnect_indication; |
| notify.connect_confirm = ircomm_tty_connect_confirm; |
| notify.connect_indication = ircomm_tty_connect_indication; |
| strlcpy(notify.name, "ircomm_tty", sizeof(notify.name)); |
| notify.instance = self; |
| |
| if (!self->ircomm) { |
| self->ircomm = ircomm_open(¬ify, self->service_type, |
| self->line); |
| } |
| if (!self->ircomm) |
| goto err; |
| |
| self->slsap_sel = self->ircomm->slsap_sel; |
| |
| /* Connect IrCOMM link with remote device */ |
| ret = ircomm_tty_attach_cable(self); |
| if (ret < 0) { |
| IRDA_ERROR("%s(), error attaching cable!\n", __FUNCTION__); |
| goto err; |
| } |
| |
| return 0; |
| err: |
| clear_bit(ASYNC_B_INITIALIZED, &self->flags); |
| return ret; |
| } |
| |
| /* |
| * Function ircomm_block_til_ready (self, filp) |
| * |
| * |
| * |
| */ |
| static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, |
| struct file *filp) |
| { |
| DECLARE_WAITQUEUE(wait, current); |
| int retval; |
| int do_clocal = 0, extra_count = 0; |
| unsigned long flags; |
| struct tty_struct *tty; |
| |
| IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| |
| tty = self->tty; |
| |
| /* |
| * If non-blocking mode is set, or the port is not enabled, |
| * then make the check up front and then exit. |
| */ |
| if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){ |
| /* nonblock mode is set or port is not enabled */ |
| self->flags |= ASYNC_NORMAL_ACTIVE; |
| IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __FUNCTION__ ); |
| return 0; |
| } |
| |
| if (tty->termios->c_cflag & CLOCAL) { |
| IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __FUNCTION__ ); |
| do_clocal = 1; |
| } |
| |
| /* Wait for carrier detect and the line to become |
| * free (i.e., not in use by the callout). While we are in |
| * this loop, self->open_count is dropped by one, so that |
| * mgsl_close() knows when to free things. We restore it upon |
| * exit, either normal or abnormal. |
| */ |
| |
| retval = 0; |
| add_wait_queue(&self->open_wait, &wait); |
| |
| IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n", |
| __FILE__,__LINE__, tty->driver->name, self->open_count ); |
| |
| /* As far as I can see, we protect open_count - Jean II */ |
| spin_lock_irqsave(&self->spinlock, flags); |
| if (!tty_hung_up_p(filp)) { |
| extra_count = 1; |
| self->open_count--; |
| } |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| self->blocked_open++; |
| |
| while (1) { |
| if (tty->termios->c_cflag & CBAUD) { |
| /* Here, we use to lock those two guys, but |
| * as ircomm_param_request() does it itself, |
| * I don't see the point (and I see the deadlock). |
| * Jean II */ |
| self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR; |
| |
| ircomm_param_request(self, IRCOMM_DTE, TRUE); |
| } |
| |
| current->state = TASK_INTERRUPTIBLE; |
| |
| if (tty_hung_up_p(filp) || |
| !test_bit(ASYNC_B_INITIALIZED, &self->flags)) { |
| retval = (self->flags & ASYNC_HUP_NOTIFY) ? |
| -EAGAIN : -ERESTARTSYS; |
| break; |
| } |
| |
| /* |
| * Check if link is ready now. Even if CLOCAL is |
| * specified, we cannot return before the IrCOMM link is |
| * ready |
| */ |
| if (!test_bit(ASYNC_B_CLOSING, &self->flags) && |
| (do_clocal || (self->settings.dce & IRCOMM_CD)) && |
| self->state == IRCOMM_TTY_READY) |
| { |
| break; |
| } |
| |
| if (signal_pending(current)) { |
| retval = -ERESTARTSYS; |
| break; |
| } |
| |
| IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n", |
| __FILE__,__LINE__, tty->driver->name, self->open_count ); |
| |
| schedule(); |
| } |
| |
| __set_current_state(TASK_RUNNING); |
| remove_wait_queue(&self->open_wait, &wait); |
| |
| if (extra_count) { |
| /* ++ is not atomic, so this should be protected - Jean II */ |
| spin_lock_irqsave(&self->spinlock, flags); |
| self->open_count++; |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| } |
| self->blocked_open--; |
| |
| IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n", |
| __FILE__,__LINE__, tty->driver->name, self->open_count); |
| |
| if (!retval) |
| self->flags |= ASYNC_NORMAL_ACTIVE; |
| |
| return retval; |
| } |
| |
| /* |
| * Function ircomm_tty_open (tty, filp) |
| * |
| * This routine is called when a particular tty device is opened. This |
| * routine is mandatory; if this routine is not filled in, the attempted |
| * open will fail with ENODEV. |
| */ |
| static int ircomm_tty_open(struct tty_struct *tty, struct file *filp) |
| { |
| struct ircomm_tty_cb *self; |
| unsigned int line; |
| unsigned long flags; |
| int ret; |
| |
| IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| |
| line = tty->index; |
| if ((line < 0) || (line >= IRCOMM_TTY_PORTS)) { |
| return -ENODEV; |
| } |
| |
| /* Check if instance already exists */ |
| self = hashbin_lock_find(ircomm_tty, line, NULL); |
| if (!self) { |
| /* No, so make new instance */ |
| self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); |
| if (self == NULL) { |
| IRDA_ERROR("%s(), kmalloc failed!\n", __FUNCTION__); |
| return -ENOMEM; |
| } |
| |
| self->magic = IRCOMM_TTY_MAGIC; |
| self->flow = FLOW_STOP; |
| |
| self->line = line; |
| INIT_WORK(&self->tqueue, ircomm_tty_do_softint); |
| self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; |
| self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; |
| self->close_delay = 5*HZ/10; |
| self->closing_wait = 30*HZ; |
| |
| /* Init some important stuff */ |
| init_timer(&self->watchdog_timer); |
| init_waitqueue_head(&self->open_wait); |
| init_waitqueue_head(&self->close_wait); |
| spin_lock_init(&self->spinlock); |
| |
| /* |
| * Force TTY into raw mode by default which is usually what |
| * we want for IrCOMM and IrLPT. This way applications will |
| * not have to twiddle with printcap etc. |
| */ |
| tty->termios->c_iflag = 0; |
| tty->termios->c_oflag = 0; |
| |
| /* Insert into hash */ |
| hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL); |
| } |
| /* ++ is not atomic, so this should be protected - Jean II */ |
| spin_lock_irqsave(&self->spinlock, flags); |
| self->open_count++; |
| |
| tty->driver_data = self; |
| self->tty = tty; |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| |
| IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __FUNCTION__ , tty->driver->name, |
| self->line, self->open_count); |
| |
| /* Not really used by us, but lets do it anyway */ |
| self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
| |
| /* |
| * If the port is the middle of closing, bail out now |
| */ |
| if (tty_hung_up_p(filp) || |
| test_bit(ASYNC_B_CLOSING, &self->flags)) { |
| |
| /* Hm, why are we blocking on ASYNC_CLOSING if we |
| * do return -EAGAIN/-ERESTARTSYS below anyway? |
| * IMHO it's either not needed in the first place |
| * or for some reason we need to make sure the async |
| * closing has been finished - if so, wouldn't we |
| * probably better sleep uninterruptible? |
| */ |
| |
| if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) { |
| IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n", |
| __FUNCTION__); |
| return -ERESTARTSYS; |
| } |
| |
| #ifdef SERIAL_DO_RESTART |
| return ((self->flags & ASYNC_HUP_NOTIFY) ? |
| -EAGAIN : -ERESTARTSYS); |
| #else |
| return -EAGAIN; |
| #endif |
| } |
| |
| /* Check if this is a "normal" ircomm device, or an irlpt device */ |
| if (line < 0x10) { |
| self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE; |
| self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */ |
| /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */ |
| self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */ |
| IRDA_DEBUG(2, "%s(), IrCOMM device\n", __FUNCTION__ ); |
| } else { |
| IRDA_DEBUG(2, "%s(), IrLPT device\n", __FUNCTION__ ); |
| self->service_type = IRCOMM_3_WIRE_RAW; |
| self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */ |
| } |
| |
| ret = ircomm_tty_startup(self); |
| if (ret) |
| return ret; |
| |
| ret = ircomm_tty_block_til_ready(self, filp); |
| if (ret) { |
| IRDA_DEBUG(2, |
| "%s(), returning after block_til_ready with %d\n", __FUNCTION__ , |
| ret); |
| |
| return ret; |
| } |
| return 0; |
| } |
| |
| /* |
| * Function ircomm_tty_close (tty, filp) |
| * |
| * This routine is called when a particular tty device is closed. |
| * |
| */ |
| static void ircomm_tty_close(struct tty_struct *tty, struct file *filp) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| unsigned long flags; |
| |
| IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| |
| if (!tty) |
| return; |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| |
| spin_lock_irqsave(&self->spinlock, flags); |
| |
| if (tty_hung_up_p(filp)) { |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| |
| IRDA_DEBUG(0, "%s(), returning 1\n", __FUNCTION__ ); |
| return; |
| } |
| |
| if ((tty->count == 1) && (self->open_count != 1)) { |
| /* |
| * Uh, oh. tty->count is 1, which means that the tty |
| * structure will be freed. state->count should always |
| * be one in these conditions. If it's greater than |
| * one, we've got real problems, since it means the |
| * serial port won't be shutdown. |
| */ |
| IRDA_DEBUG(0, "%s(), bad serial port count; " |
| "tty->count is 1, state->count is %d\n", __FUNCTION__ , |
| self->open_count); |
| self->open_count = 1; |
| } |
| |
| if (--self->open_count < 0) { |
| IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n", |
| __FUNCTION__, self->line, self->open_count); |
| self->open_count = 0; |
| } |
| if (self->open_count) { |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| |
| IRDA_DEBUG(0, "%s(), open count > 0\n", __FUNCTION__ ); |
| return; |
| } |
| |
| /* Hum... Should be test_and_set_bit ??? - Jean II */ |
| set_bit(ASYNC_B_CLOSING, &self->flags); |
| |
| /* We need to unlock here (we were unlocking at the end of this |
| * function), because tty_wait_until_sent() may schedule. |
| * I don't know if the rest should be protected somehow, |
| * so someone should check. - Jean II */ |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| |
| /* |
| * Now we wait for the transmit buffer to clear; and we notify |
| * the line discipline to only process XON/XOFF characters. |
| */ |
| tty->closing = 1; |
| if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE) |
| tty_wait_until_sent(tty, self->closing_wait); |
| |
| ircomm_tty_shutdown(self); |
| |
| if (tty->driver->flush_buffer) |
| tty->driver->flush_buffer(tty); |
| if (tty->ldisc.flush_buffer) |
| tty->ldisc.flush_buffer(tty); |
| |
| tty->closing = 0; |
| self->tty = NULL; |
| |
| if (self->blocked_open) { |
| if (self->close_delay) |
| schedule_timeout_interruptible(self->close_delay); |
| wake_up_interruptible(&self->open_wait); |
| } |
| |
| self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); |
| wake_up_interruptible(&self->close_wait); |
| } |
| |
| /* |
| * Function ircomm_tty_flush_buffer (tty) |
| * |
| * |
| * |
| */ |
| static void ircomm_tty_flush_buffer(struct tty_struct *tty) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| |
| /* |
| * Let do_softint() do this to avoid race condition with |
| * do_softint() ;-) |
| */ |
| schedule_work(&self->tqueue); |
| } |
| |
| /* |
| * Function ircomm_tty_do_softint (work) |
| * |
| * We use this routine to give the write wakeup to the user at at a |
| * safe time (as fast as possible after write have completed). This |
| * can be compared to the Tx interrupt. |
| */ |
| static void ircomm_tty_do_softint(struct work_struct *work) |
| { |
| struct ircomm_tty_cb *self = |
| container_of(work, struct ircomm_tty_cb, tqueue); |
| struct tty_struct *tty; |
| unsigned long flags; |
| struct sk_buff *skb, *ctrl_skb; |
| |
| IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| |
| if (!self || self->magic != IRCOMM_TTY_MAGIC) |
| return; |
| |
| tty = self->tty; |
| if (!tty) |
| return; |
| |
| /* Unlink control buffer */ |
| spin_lock_irqsave(&self->spinlock, flags); |
| |
| ctrl_skb = self->ctrl_skb; |
| self->ctrl_skb = NULL; |
| |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| |
| /* Flush control buffer if any */ |
| if(ctrl_skb) { |
| if(self->flow == FLOW_START) |
| ircomm_control_request(self->ircomm, ctrl_skb); |
| /* Drop reference count - see ircomm_ttp_data_request(). */ |
| dev_kfree_skb(ctrl_skb); |
| } |
| |
| if (tty->hw_stopped) |
| return; |
| |
| /* Unlink transmit buffer */ |
| spin_lock_irqsave(&self->spinlock, flags); |
| |
| skb = self->tx_skb; |
| self->tx_skb = NULL; |
| |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| |
| /* Flush transmit buffer if any */ |
| if (skb) { |
| ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); |
| /* Drop reference count - see ircomm_ttp_data_request(). */ |
| dev_kfree_skb(skb); |
| } |
| |
| /* Check if user (still) wants to be waken up */ |
| if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && |
| tty->ldisc.write_wakeup) |
| { |
| (tty->ldisc.write_wakeup)(tty); |
| } |
| wake_up_interruptible(&tty->write_wait); |
| } |
| |
| /* |
| * Function ircomm_tty_write (tty, buf, count) |
| * |
| * This routine is called by the kernel to write a series of characters |
| * to the tty device. The characters may come from user space or kernel |
| * space. This routine will return the number of characters actually |
| * accepted for writing. This routine is mandatory. |
| */ |
| static int ircomm_tty_write(struct tty_struct *tty, |
| const unsigned char *buf, int count) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| unsigned long flags; |
| struct sk_buff *skb; |
| int tailroom = 0; |
| int len = 0; |
| int size; |
| |
| IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __FUNCTION__ , count, |
| tty->hw_stopped); |
| |
| IRDA_ASSERT(self != NULL, return -1;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| |
| /* We may receive packets from the TTY even before we have finished |
| * our setup. Not cool. |
| * The problem is that we don't know the final header and data size |
| * to create the proper skb, so any skb we would create would have |
| * bogus header and data size, so need care. |
| * We use a bogus header size to safely detect this condition. |
| * Another problem is that hw_stopped was set to 0 way before it |
| * should be, so we would drop this skb. It should now be fixed. |
| * One option is to not accept data until we are properly setup. |
| * But, I suspect that when it happens, the ppp line discipline |
| * just "drops" the data, which might screw up connect scripts. |
| * The second option is to create a "safe skb", with large header |
| * and small size (see ircomm_tty_open() for values). |
| * We just need to make sure that when the real values get filled, |
| * we don't mess up the original "safe skb" (see tx_data_size). |
| * Jean II */ |
| if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { |
| IRDA_DEBUG(1, "%s() : not initialised\n", __FUNCTION__); |
| #ifdef IRCOMM_NO_TX_BEFORE_INIT |
| /* We didn't consume anything, TTY will retry */ |
| return 0; |
| #endif |
| } |
| |
| if (count < 1) |
| return 0; |
| |
| /* Protect our manipulation of self->tx_skb and related */ |
| spin_lock_irqsave(&self->spinlock, flags); |
| |
| /* Fetch current transmit buffer */ |
| skb = self->tx_skb; |
| |
| /* |
| * Send out all the data we get, possibly as multiple fragmented |
| * frames, but this will only happen if the data is larger than the |
| * max data size. The normal case however is just the opposite, and |
| * this function may be called multiple times, and will then actually |
| * defragment the data and send it out as one packet as soon as |
| * possible, but at a safer point in time |
| */ |
| while (count) { |
| size = count; |
| |
| /* Adjust data size to the max data size */ |
| if (size > self->max_data_size) |
| size = self->max_data_size; |
| |
| /* |
| * Do we already have a buffer ready for transmit, or do |
| * we need to allocate a new frame |
| */ |
| if (skb) { |
| /* |
| * Any room for more data at the end of the current |
| * transmit buffer? Cannot use skb_tailroom, since |
| * dev_alloc_skb gives us a larger skb than we |
| * requested |
| * Note : use tx_data_size, because max_data_size |
| * may have changed and we don't want to overwrite |
| * the skb. - Jean II |
| */ |
| if ((tailroom = (self->tx_data_size - skb->len)) > 0) { |
| /* Adjust data to tailroom */ |
| if (size > tailroom) |
| size = tailroom; |
| } else { |
| /* |
| * Current transmit frame is full, so break |
| * out, so we can send it as soon as possible |
| */ |
| break; |
| } |
| } else { |
| /* Prepare a full sized frame */ |
| skb = alloc_skb(self->max_data_size+ |
| self->max_header_size, |
| GFP_ATOMIC); |
| if (!skb) { |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| return -ENOBUFS; |
| } |
| skb_reserve(skb, self->max_header_size); |
| self->tx_skb = skb; |
| /* Remember skb size because max_data_size may |
| * change later on - Jean II */ |
| self->tx_data_size = self->max_data_size; |
| } |
| |
| /* Copy data */ |
| memcpy(skb_put(skb,size), buf + len, size); |
| |
| count -= size; |
| len += size; |
| } |
| |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| |
| /* |
| * Schedule a new thread which will transmit the frame as soon |
| * as possible, but at a safe point in time. We do this so the |
| * "user" can give us data multiple times, as PPP does (because of |
| * its 256 byte tx buffer). We will then defragment and send out |
| * all this data as one single packet. |
| */ |
| schedule_work(&self->tqueue); |
| |
| return len; |
| } |
| |
| /* |
| * Function ircomm_tty_write_room (tty) |
| * |
| * This routine returns the numbers of characters the tty driver will |
| * accept for queuing to be written. This number is subject to change as |
| * output buffers get emptied, or if the output flow control is acted. |
| */ |
| static int ircomm_tty_write_room(struct tty_struct *tty) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| unsigned long flags; |
| int ret; |
| |
| IRDA_ASSERT(self != NULL, return -1;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| |
| #ifdef IRCOMM_NO_TX_BEFORE_INIT |
| /* max_header_size tells us if the channel is initialised or not. */ |
| if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) |
| /* Don't bother us yet */ |
| return 0; |
| #endif |
| |
| /* Check if we are allowed to transmit any data. |
| * hw_stopped is the regular flow control. |
| * Jean II */ |
| if (tty->hw_stopped) |
| ret = 0; |
| else { |
| spin_lock_irqsave(&self->spinlock, flags); |
| if (self->tx_skb) |
| ret = self->tx_data_size - self->tx_skb->len; |
| else |
| ret = self->max_data_size; |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| } |
| IRDA_DEBUG(2, "%s(), ret=%d\n", __FUNCTION__ , ret); |
| |
| return ret; |
| } |
| |
| /* |
| * Function ircomm_tty_wait_until_sent (tty, timeout) |
| * |
| * This routine waits until the device has written out all of the |
| * characters in its transmitter FIFO. |
| */ |
| static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| unsigned long orig_jiffies, poll_time; |
| unsigned long flags; |
| |
| IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| |
| orig_jiffies = jiffies; |
| |
| /* Set poll time to 200 ms */ |
| poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200)); |
| |
| spin_lock_irqsave(&self->spinlock, flags); |
| while (self->tx_skb && self->tx_skb->len) { |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| schedule_timeout_interruptible(poll_time); |
| spin_lock_irqsave(&self->spinlock, flags); |
| if (signal_pending(current)) |
| break; |
| if (timeout && time_after(jiffies, orig_jiffies + timeout)) |
| break; |
| } |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| current->state = TASK_RUNNING; |
| } |
| |
| /* |
| * Function ircomm_tty_throttle (tty) |
| * |
| * This routine notifies the tty driver that input buffers for the line |
| * discipline are close to full, and it should somehow signal that no |
| * more characters should be sent to the tty. |
| */ |
| static void ircomm_tty_throttle(struct tty_struct *tty) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| |
| IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| |
| /* Software flow control? */ |
| if (I_IXOFF(tty)) |
| ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); |
| |
| /* Hardware flow control? */ |
| if (tty->termios->c_cflag & CRTSCTS) { |
| self->settings.dte &= ~IRCOMM_RTS; |
| self->settings.dte |= IRCOMM_DELTA_RTS; |
| |
| ircomm_param_request(self, IRCOMM_DTE, TRUE); |
| } |
| |
| ircomm_flow_request(self->ircomm, FLOW_STOP); |
| } |
| |
| /* |
| * Function ircomm_tty_unthrottle (tty) |
| * |
| * This routine notifies the tty drivers that it should signals that |
| * characters can now be sent to the tty without fear of overrunning the |
| * input buffers of the line disciplines. |
| */ |
| static void ircomm_tty_unthrottle(struct tty_struct *tty) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| |
| IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| |
| /* Using software flow control? */ |
| if (I_IXOFF(tty)) { |
| ircomm_tty_send_xchar(tty, START_CHAR(tty)); |
| } |
| |
| /* Using hardware flow control? */ |
| if (tty->termios->c_cflag & CRTSCTS) { |
| self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); |
| |
| ircomm_param_request(self, IRCOMM_DTE, TRUE); |
| IRDA_DEBUG(1, "%s(), FLOW_START\n", __FUNCTION__ ); |
| } |
| ircomm_flow_request(self->ircomm, FLOW_START); |
| } |
| |
| /* |
| * Function ircomm_tty_chars_in_buffer (tty) |
| * |
| * Indicates if there are any data in the buffer |
| * |
| */ |
| static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| unsigned long flags; |
| int len = 0; |
| |
| IRDA_ASSERT(self != NULL, return -1;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| |
| spin_lock_irqsave(&self->spinlock, flags); |
| |
| if (self->tx_skb) |
| len = self->tx_skb->len; |
| |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| |
| return len; |
| } |
| |
| static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) |
| { |
| unsigned long flags; |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| |
| IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| |
| if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags)) |
| return; |
| |
| ircomm_tty_detach_cable(self); |
| |
| spin_lock_irqsave(&self->spinlock, flags); |
| |
| del_timer(&self->watchdog_timer); |
| |
| /* Free parameter buffer */ |
| if (self->ctrl_skb) { |
| dev_kfree_skb(self->ctrl_skb); |
| self->ctrl_skb = NULL; |
| } |
| |
| /* Free transmit buffer */ |
| if (self->tx_skb) { |
| dev_kfree_skb(self->tx_skb); |
| self->tx_skb = NULL; |
| } |
| |
| if (self->ircomm) { |
| ircomm_close(self->ircomm); |
| self->ircomm = NULL; |
| } |
| |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| } |
| |
| /* |
| * Function ircomm_tty_hangup (tty) |
| * |
| * This routine notifies the tty driver that it should hangup the tty |
| * device. |
| * |
| */ |
| static void ircomm_tty_hangup(struct tty_struct *tty) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| unsigned long flags; |
| |
| IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| |
| if (!tty) |
| return; |
| |
| /* ircomm_tty_flush_buffer(tty); */ |
| ircomm_tty_shutdown(self); |
| |
| /* I guess we need to lock here - Jean II */ |
| spin_lock_irqsave(&self->spinlock, flags); |
| self->flags &= ~ASYNC_NORMAL_ACTIVE; |
| self->tty = NULL; |
| self->open_count = 0; |
| spin_unlock_irqrestore(&self->spinlock, flags); |
| |
| wake_up_interruptible(&self->open_wait); |
| } |
| |
| /* |
| * Function ircomm_tty_send_xchar (tty, ch) |
| * |
| * This routine is used to send a high-priority XON/XOFF character to |
| * the device. |
| */ |
| static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) |
| { |
| IRDA_DEBUG(0, "%s(), not impl\n", __FUNCTION__ ); |
| } |
| |
| /* |
| * Function ircomm_tty_start (tty) |
| * |
| * This routine notifies the tty driver that it resume sending |
| * characters to the tty device. |
| */ |
| void ircomm_tty_start(struct tty_struct *tty) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| |
| ircomm_flow_request(self->ircomm, FLOW_START); |
| } |
| |
| /* |
| * Function ircomm_tty_stop (tty) |
| * |
| * This routine notifies the tty driver that it should stop outputting |
| * characters to the tty device. |
| */ |
| static void ircomm_tty_stop(struct tty_struct *tty) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| |
| ircomm_flow_request(self->ircomm, FLOW_STOP); |
| } |
| |
| /* |
| * Function ircomm_check_modem_status (self) |
| * |
| * Check for any changes in the DCE's line settings. This function should |
| * be called whenever the dce parameter settings changes, to update the |
| * flow control settings and other things |
| */ |
| void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) |
| { |
| struct tty_struct *tty; |
| int status; |
| |
| IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| |
| tty = self->tty; |
| |
| status = self->settings.dce; |
| |
| if (status & IRCOMM_DCE_DELTA_ANY) { |
| /*wake_up_interruptible(&self->delta_msr_wait);*/ |
| } |
| if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) { |
| IRDA_DEBUG(2, |
| "%s(), ircomm%d CD now %s...\n", __FUNCTION__ , self->line, |
| (status & IRCOMM_CD) ? "on" : "off"); |
| |
| if (status & IRCOMM_CD) { |
| wake_up_interruptible(&self->open_wait); |
| } else { |
| IRDA_DEBUG(2, |
| "%s(), Doing serial hangup..\n", __FUNCTION__ ); |
| if (tty) |
| tty_hangup(tty); |
| |
| /* Hangup will remote the tty, so better break out */ |
| return; |
| } |
| } |
| if (self->flags & ASYNC_CTS_FLOW) { |
| if (tty->hw_stopped) { |
| if (status & IRCOMM_CTS) { |
| IRDA_DEBUG(2, |
| "%s(), CTS tx start...\n", __FUNCTION__ ); |
| tty->hw_stopped = 0; |
| |
| /* Wake up processes blocked on open */ |
| wake_up_interruptible(&self->open_wait); |
| |
| schedule_work(&self->tqueue); |
| return; |
| } |
| } else { |
| if (!(status & IRCOMM_CTS)) { |
| IRDA_DEBUG(2, |
| "%s(), CTS tx stop...\n", __FUNCTION__ ); |
| tty->hw_stopped = 1; |
| } |
| } |
| } |
| } |
| |
| /* |
| * Function ircomm_tty_data_indication (instance, sap, skb) |
| * |
| * Handle incoming data, and deliver it to the line discipline |
| * |
| */ |
| static int ircomm_tty_data_indication(void *instance, void *sap, |
| struct sk_buff *skb) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; |
| |
| IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| |
| IRDA_ASSERT(self != NULL, return -1;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| IRDA_ASSERT(skb != NULL, return -1;); |
| |
| if (!self->tty) { |
| IRDA_DEBUG(0, "%s(), no tty!\n", __FUNCTION__ ); |
| return 0; |
| } |
| |
| /* |
| * If we receive data when hardware is stopped then something is wrong. |
| * We try to poll the peers line settings to check if we are up todate. |
| * Devices like WinCE can do this, and since they don't send any |
| * params, we can just as well declare the hardware for running. |
| */ |
| if (self->tty->hw_stopped && (self->flow == FLOW_START)) { |
| IRDA_DEBUG(0, "%s(), polling for line settings!\n", __FUNCTION__ ); |
| ircomm_param_request(self, IRCOMM_POLL, TRUE); |
| |
| /* We can just as well declare the hardware for running */ |
| ircomm_tty_send_initial_parameters(self); |
| ircomm_tty_link_established(self); |
| } |
| |
| /* |
| * Just give it over to the line discipline. There is no need to |
| * involve the flip buffers, since we are not running in an interrupt |
| * handler |
| */ |
| self->tty->ldisc.receive_buf(self->tty, skb->data, NULL, skb->len); |
| |
| /* No need to kfree_skb - see ircomm_ttp_data_indication() */ |
| |
| return 0; |
| } |
| |
| /* |
| * Function ircomm_tty_control_indication (instance, sap, skb) |
| * |
| * Parse all incoming parameters (easy!) |
| * |
| */ |
| static int ircomm_tty_control_indication(void *instance, void *sap, |
| struct sk_buff *skb) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; |
| int clen; |
| |
| IRDA_DEBUG(4, "%s()\n", __FUNCTION__ ); |
| |
| IRDA_ASSERT(self != NULL, return -1;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| IRDA_ASSERT(skb != NULL, return -1;); |
| |
| clen = skb->data[0]; |
| |
| irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen), |
| &ircomm_param_info); |
| |
| /* No need to kfree_skb - see ircomm_control_indication() */ |
| |
| return 0; |
| } |
| |
| /* |
| * Function ircomm_tty_flow_indication (instance, sap, cmd) |
| * |
| * This function is called by IrTTP when it wants us to slow down the |
| * transmission of data. We just mark the hardware as stopped, and wait |
| * for IrTTP to notify us that things are OK again. |
| */ |
| static void ircomm_tty_flow_indication(void *instance, void *sap, |
| LOCAL_FLOW cmd) |
| { |
| struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; |
| struct tty_struct *tty; |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| |
| tty = self->tty; |
| |
| switch (cmd) { |
| case FLOW_START: |
| IRDA_DEBUG(2, "%s(), hw start!\n", __FUNCTION__ ); |
| tty->hw_stopped = 0; |
| |
| /* ircomm_tty_do_softint will take care of the rest */ |
| schedule_work(&self->tqueue); |
| break; |
| default: /* If we get here, something is very wrong, better stop */ |
| case FLOW_STOP: |
| IRDA_DEBUG(2, "%s(), hw stopped!\n", __FUNCTION__ ); |
| tty->hw_stopped = 1; |
| break; |
| } |
| self->flow = cmd; |
| } |
| |
| static int ircomm_tty_line_info(struct ircomm_tty_cb *self, char *buf) |
| { |
| int ret=0; |
| |
| ret += sprintf(buf+ret, "State: %s\n", ircomm_tty_state[self->state]); |
| |
| ret += sprintf(buf+ret, "Service type: "); |
| if (self->service_type & IRCOMM_9_WIRE) |
| ret += sprintf(buf+ret, "9_WIRE"); |
| else if (self->service_type & IRCOMM_3_WIRE) |
| ret += sprintf(buf+ret, "3_WIRE"); |
| else if (self->service_type & IRCOMM_3_WIRE_RAW) |
| ret += sprintf(buf+ret, "3_WIRE_RAW"); |
| else |
| ret += sprintf(buf+ret, "No common service type!\n"); |
| ret += sprintf(buf+ret, "\n"); |
| |
| ret += sprintf(buf+ret, "Port name: %s\n", self->settings.port_name); |
| |
| ret += sprintf(buf+ret, "DTE status: "); |
| if (self->settings.dte & IRCOMM_RTS) |
| ret += sprintf(buf+ret, "RTS|"); |
| if (self->settings.dte & IRCOMM_DTR) |
| ret += sprintf(buf+ret, "DTR|"); |
| if (self->settings.dte) |
| ret--; /* remove the last | */ |
| ret += sprintf(buf+ret, "\n"); |
| |
| ret += sprintf(buf+ret, "DCE status: "); |
| if (self->settings.dce & IRCOMM_CTS) |
| ret += sprintf(buf+ret, "CTS|"); |
| if (self->settings.dce & IRCOMM_DSR) |
| ret += sprintf(buf+ret, "DSR|"); |
| if (self->settings.dce & IRCOMM_CD) |
| ret += sprintf(buf+ret, "CD|"); |
| if (self->settings.dce & IRCOMM_RI) |
| ret += sprintf(buf+ret, "RI|"); |
| if (self->settings.dce) |
| ret--; /* remove the last | */ |
| ret += sprintf(buf+ret, "\n"); |
| |
| ret += sprintf(buf+ret, "Configuration: "); |
| if (!self->settings.null_modem) |
| ret += sprintf(buf+ret, "DTE <-> DCE\n"); |
| else |
| ret += sprintf(buf+ret, |
| "DTE <-> DTE (null modem emulation)\n"); |
| |
| ret += sprintf(buf+ret, "Data rate: %d\n", self->settings.data_rate); |
| |
| ret += sprintf(buf+ret, "Flow control: "); |
| if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) |
| ret += sprintf(buf+ret, "XON_XOFF_IN|"); |
| if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) |
| ret += sprintf(buf+ret, "XON_XOFF_OUT|"); |
| if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) |
| ret += sprintf(buf+ret, "RTS_CTS_IN|"); |
| if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) |
| ret += sprintf(buf+ret, "RTS_CTS_OUT|"); |
| if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) |
| ret += sprintf(buf+ret, "DSR_DTR_IN|"); |
| if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) |
| ret += sprintf(buf+ret, "DSR_DTR_OUT|"); |
| if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) |
| ret += sprintf(buf+ret, "ENQ_ACK_IN|"); |
| if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) |
| ret += sprintf(buf+ret, "ENQ_ACK_OUT|"); |
| if (self->settings.flow_control) |
| ret--; /* remove the last | */ |
| ret += sprintf(buf+ret, "\n"); |
| |
| ret += sprintf(buf+ret, "Flags: "); |
| if (self->flags & ASYNC_CTS_FLOW) |
| ret += sprintf(buf+ret, "ASYNC_CTS_FLOW|"); |
| if (self->flags & ASYNC_CHECK_CD) |
| ret += sprintf(buf+ret, "ASYNC_CHECK_CD|"); |
| if (self->flags & ASYNC_INITIALIZED) |
| ret += sprintf(buf+ret, "ASYNC_INITIALIZED|"); |
| if (self->flags & ASYNC_LOW_LATENCY) |
| ret += sprintf(buf+ret, "ASYNC_LOW_LATENCY|"); |
| if (self->flags & ASYNC_CLOSING) |
| ret += sprintf(buf+ret, "ASYNC_CLOSING|"); |
| if (self->flags & ASYNC_NORMAL_ACTIVE) |
| ret += sprintf(buf+ret, "ASYNC_NORMAL_ACTIVE|"); |
| if (self->flags) |
| ret--; /* remove the last | */ |
| ret += sprintf(buf+ret, "\n"); |
| |
| ret += sprintf(buf+ret, "Role: %s\n", self->client ? |
| "client" : "server"); |
| ret += sprintf(buf+ret, "Open count: %d\n", self->open_count); |
| ret += sprintf(buf+ret, "Max data size: %d\n", self->max_data_size); |
| ret += sprintf(buf+ret, "Max header size: %d\n", self->max_header_size); |
| |
| if (self->tty) |
| ret += sprintf(buf+ret, "Hardware: %s\n", |
| self->tty->hw_stopped ? "Stopped" : "Running"); |
| |
| ret += sprintf(buf+ret, "\n"); |
| return ret; |
| } |
| |
| |
| /* |
| * Function ircomm_tty_read_proc (buf, start, offset, len, eof, unused) |
| * |
| * |
| * |
| */ |
| #ifdef CONFIG_PROC_FS |
| static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len, |
| int *eof, void *unused) |
| { |
| struct ircomm_tty_cb *self; |
| int count = 0, l; |
| off_t begin = 0; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); |
| |
| self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); |
| while ((self != NULL) && (count < 4000)) { |
| if (self->magic != IRCOMM_TTY_MAGIC) |
| break; |
| |
| l = ircomm_tty_line_info(self, buf + count); |
| count += l; |
| if (count+begin > offset+len) |
| goto done; |
| if (count+begin < offset) { |
| begin += count; |
| count = 0; |
| } |
| |
| self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); |
| } |
| *eof = 1; |
| done: |
| spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); |
| |
| if (offset >= count+begin) |
| return 0; |
| *start = buf + (offset-begin); |
| return ((len < begin+count-offset) ? len : begin+count-offset); |
| } |
| #endif /* CONFIG_PROC_FS */ |
| |
| MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); |
| MODULE_DESCRIPTION("IrCOMM serial TTY driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); |
| |
| module_init(ircomm_tty_init); |
| module_exit(ircomm_tty_cleanup); |