faa82ca2dfdcf9c8cff71b486434997d832c87cf
[linux-3.10.git] / net / irda / ircomm / ircomm_tty.c
1 /*********************************************************************
2  *
3  * Filename:      ircomm_tty.c
4  * Version:       1.0
5  * Description:   IrCOMM serial TTY driver
6  * Status:        Experimental.
7  * Author:        Dag Brattli <dagb@cs.uit.no>
8  * Created at:    Sun Jun  6 21:00:56 1999
9  * Modified at:   Wed Feb 23 00:09:02 2000
10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
11  * Sources:       serial.c and previous IrCOMM work by Takahide Higuchi
12  *
13  *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
14  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
15  *
16  *     This program is free software; you can redistribute it and/or
17  *     modify it under the terms of the GNU General Public License as
18  *     published by the Free Software Foundation; either version 2 of
19  *     the License, or (at your option) any later version.
20  *
21  *     This program is distributed in the hope that it will be useful,
22  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
23  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24  *     GNU General Public License for more details.
25  *
26  *     You should have received a copy of the GNU General Public License
27  *     along with this program; if not, write to the Free Software
28  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29  *     MA 02111-1307 USA
30  *
31  ********************************************************************/
32
33 #include <linux/init.h>
34 #include <linux/module.h>
35 #include <linux/fs.h>
36 #include <linux/slab.h>
37 #include <linux/sched.h>
38 #include <linux/seq_file.h>
39 #include <linux/termios.h>
40 #include <linux/tty.h>
41 #include <linux/interrupt.h>
42 #include <linux/device.h>               /* for MODULE_ALIAS_CHARDEV_MAJOR */
43
44 #include <asm/uaccess.h>
45
46 #include <net/irda/irda.h>
47 #include <net/irda/irmod.h>
48
49 #include <net/irda/ircomm_core.h>
50 #include <net/irda/ircomm_param.h>
51 #include <net/irda/ircomm_tty_attach.h>
52 #include <net/irda/ircomm_tty.h>
53
54 static int  ircomm_tty_open(struct tty_struct *tty, struct file *filp);
55 static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
56 static int  ircomm_tty_write(struct tty_struct * tty,
57                              const unsigned char *buf, int count);
58 static int  ircomm_tty_write_room(struct tty_struct *tty);
59 static void ircomm_tty_throttle(struct tty_struct *tty);
60 static void ircomm_tty_unthrottle(struct tty_struct *tty);
61 static int  ircomm_tty_chars_in_buffer(struct tty_struct *tty);
62 static void ircomm_tty_flush_buffer(struct tty_struct *tty);
63 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
64 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
65 static void ircomm_tty_hangup(struct tty_struct *tty);
66 static void ircomm_tty_do_softint(struct work_struct *work);
67 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
68 static void ircomm_tty_stop(struct tty_struct *tty);
69
70 static int ircomm_tty_data_indication(void *instance, void *sap,
71                                       struct sk_buff *skb);
72 static int ircomm_tty_control_indication(void *instance, void *sap,
73                                          struct sk_buff *skb);
74 static void ircomm_tty_flow_indication(void *instance, void *sap,
75                                        LOCAL_FLOW cmd);
76 #ifdef CONFIG_PROC_FS
77 static const struct file_operations ircomm_tty_proc_fops;
78 #endif /* CONFIG_PROC_FS */
79 static struct tty_driver *driver;
80
81 static hashbin_t *ircomm_tty = NULL;
82
83 static const struct tty_operations ops = {
84         .open            = ircomm_tty_open,
85         .close           = ircomm_tty_close,
86         .write           = ircomm_tty_write,
87         .write_room      = ircomm_tty_write_room,
88         .chars_in_buffer = ircomm_tty_chars_in_buffer,
89         .flush_buffer    = ircomm_tty_flush_buffer,
90         .ioctl           = ircomm_tty_ioctl,    /* ircomm_tty_ioctl.c */
91         .tiocmget        = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
92         .tiocmset        = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
93         .throttle        = ircomm_tty_throttle,
94         .unthrottle      = ircomm_tty_unthrottle,
95         .send_xchar      = ircomm_tty_send_xchar,
96         .set_termios     = ircomm_tty_set_termios,
97         .stop            = ircomm_tty_stop,
98         .start           = ircomm_tty_start,
99         .hangup          = ircomm_tty_hangup,
100         .wait_until_sent = ircomm_tty_wait_until_sent,
101 #ifdef CONFIG_PROC_FS
102         .proc_fops       = &ircomm_tty_proc_fops,
103 #endif /* CONFIG_PROC_FS */
104 };
105
106 /*
107  * Function ircomm_tty_init()
108  *
109  *    Init IrCOMM TTY layer/driver
110  *
111  */
112 static int __init ircomm_tty_init(void)
113 {
114         driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
115         if (!driver)
116                 return -ENOMEM;
117         ircomm_tty = hashbin_new(HB_LOCK);
118         if (ircomm_tty == NULL) {
119                 IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__);
120                 put_tty_driver(driver);
121                 return -ENOMEM;
122         }
123
124         driver->owner           = THIS_MODULE;
125         driver->driver_name     = "ircomm";
126         driver->name            = "ircomm";
127         driver->major           = IRCOMM_TTY_MAJOR;
128         driver->minor_start     = IRCOMM_TTY_MINOR;
129         driver->type            = TTY_DRIVER_TYPE_SERIAL;
130         driver->subtype         = SERIAL_TYPE_NORMAL;
131         driver->init_termios    = tty_std_termios;
132         driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
133         driver->flags           = TTY_DRIVER_REAL_RAW;
134         tty_set_operations(driver, &ops);
135         if (tty_register_driver(driver)) {
136                 IRDA_ERROR("%s(): Couldn't register serial driver\n",
137                            __func__);
138                 put_tty_driver(driver);
139                 return -1;
140         }
141         return 0;
142 }
143
144 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
145 {
146         IRDA_DEBUG(0, "%s()\n", __func__ );
147
148         IRDA_ASSERT(self != NULL, return;);
149         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
150
151         ircomm_tty_shutdown(self);
152
153         self->magic = 0;
154         kfree(self);
155 }
156
157 /*
158  * Function ircomm_tty_cleanup ()
159  *
160  *    Remove IrCOMM TTY layer/driver
161  *
162  */
163 static void __exit ircomm_tty_cleanup(void)
164 {
165         int ret;
166
167         IRDA_DEBUG(4, "%s()\n", __func__ );
168
169         ret = tty_unregister_driver(driver);
170         if (ret) {
171                 IRDA_ERROR("%s(), failed to unregister driver\n",
172                            __func__);
173                 return;
174         }
175
176         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
177         put_tty_driver(driver);
178 }
179
180 /*
181  * Function ircomm_startup (self)
182  *
183  *
184  *
185  */
186 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
187 {
188         notify_t notify;
189         int ret = -ENODEV;
190
191         IRDA_DEBUG(2, "%s()\n", __func__ );
192
193         IRDA_ASSERT(self != NULL, return -1;);
194         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
195
196         /* Check if already open */
197         if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) {
198                 IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ );
199                 return 0;
200         }
201
202         /* Register with IrCOMM */
203         irda_notify_init(&notify);
204         /* These callbacks we must handle ourselves */
205         notify.data_indication       = ircomm_tty_data_indication;
206         notify.udata_indication      = ircomm_tty_control_indication;
207         notify.flow_indication       = ircomm_tty_flow_indication;
208
209         /* Use the ircomm_tty interface for these ones */
210         notify.disconnect_indication = ircomm_tty_disconnect_indication;
211         notify.connect_confirm       = ircomm_tty_connect_confirm;
212         notify.connect_indication    = ircomm_tty_connect_indication;
213         strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
214         notify.instance = self;
215
216         if (!self->ircomm) {
217                 self->ircomm = ircomm_open(&notify, self->service_type,
218                                            self->line);
219         }
220         if (!self->ircomm)
221                 goto err;
222
223         self->slsap_sel = self->ircomm->slsap_sel;
224
225         /* Connect IrCOMM link with remote device */
226         ret = ircomm_tty_attach_cable(self);
227         if (ret < 0) {
228                 IRDA_ERROR("%s(), error attaching cable!\n", __func__);
229                 goto err;
230         }
231
232         return 0;
233 err:
234         clear_bit(ASYNC_B_INITIALIZED, &self->flags);
235         return ret;
236 }
237
238 /*
239  * Function ircomm_block_til_ready (self, filp)
240  *
241  *
242  *
243  */
244 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
245                                       struct file *filp)
246 {
247         DECLARE_WAITQUEUE(wait, current);
248         int             retval;
249         int             do_clocal = 0, extra_count = 0;
250         unsigned long   flags;
251         struct tty_struct *tty;
252
253         IRDA_DEBUG(2, "%s()\n", __func__ );
254
255         tty = self->tty;
256
257         /*
258          * If non-blocking mode is set, or the port is not enabled,
259          * then make the check up front and then exit.
260          */
261         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
262                 /* nonblock mode is set or port is not enabled */
263                 self->flags |= ASYNC_NORMAL_ACTIVE;
264                 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ );
265                 return 0;
266         }
267
268         if (tty->termios->c_cflag & CLOCAL) {
269                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ );
270                 do_clocal = 1;
271         }
272
273         /* Wait for carrier detect and the line to become
274          * free (i.e., not in use by the callout).  While we are in
275          * this loop, self->open_count is dropped by one, so that
276          * mgsl_close() knows when to free things.  We restore it upon
277          * exit, either normal or abnormal.
278          */
279
280         retval = 0;
281         add_wait_queue(&self->open_wait, &wait);
282
283         IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
284               __FILE__,__LINE__, tty->driver->name, self->open_count );
285
286         /* As far as I can see, we protect open_count - Jean II */
287         spin_lock_irqsave(&self->spinlock, flags);
288         if (!tty_hung_up_p(filp)) {
289                 extra_count = 1;
290                 self->open_count--;
291         }
292         spin_unlock_irqrestore(&self->spinlock, flags);
293         self->blocked_open++;
294
295         while (1) {
296                 if (tty->termios->c_cflag & CBAUD) {
297                         /* Here, we use to lock those two guys, but
298                          * as ircomm_param_request() does it itself,
299                          * I don't see the point (and I see the deadlock).
300                          * Jean II */
301                         self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR;
302
303                         ircomm_param_request(self, IRCOMM_DTE, TRUE);
304                 }
305
306                 current->state = TASK_INTERRUPTIBLE;
307
308                 if (tty_hung_up_p(filp) ||
309                     !test_bit(ASYNC_B_INITIALIZED, &self->flags)) {
310                         retval = (self->flags & ASYNC_HUP_NOTIFY) ?
311                                         -EAGAIN : -ERESTARTSYS;
312                         break;
313                 }
314
315                 /*
316                  * Check if link is ready now. Even if CLOCAL is
317                  * specified, we cannot return before the IrCOMM link is
318                  * ready
319                  */
320                 if (!test_bit(ASYNC_B_CLOSING, &self->flags) &&
321                     (do_clocal || (self->settings.dce & IRCOMM_CD)) &&
322                     self->state == IRCOMM_TTY_READY)
323                 {
324                         break;
325                 }
326
327                 if (signal_pending(current)) {
328                         retval = -ERESTARTSYS;
329                         break;
330                 }
331
332                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
333                       __FILE__,__LINE__, tty->driver->name, self->open_count );
334
335                 schedule();
336         }
337
338         __set_current_state(TASK_RUNNING);
339         remove_wait_queue(&self->open_wait, &wait);
340
341         if (extra_count) {
342                 /* ++ is not atomic, so this should be protected - Jean II */
343                 spin_lock_irqsave(&self->spinlock, flags);
344                 self->open_count++;
345                 spin_unlock_irqrestore(&self->spinlock, flags);
346         }
347         self->blocked_open--;
348
349         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
350               __FILE__,__LINE__, tty->driver->name, self->open_count);
351
352         if (!retval)
353                 self->flags |= ASYNC_NORMAL_ACTIVE;
354
355         return retval;
356 }
357
358 /*
359  * Function ircomm_tty_open (tty, filp)
360  *
361  *    This routine is called when a particular tty device is opened. This
362  *    routine is mandatory; if this routine is not filled in, the attempted
363  *    open will fail with ENODEV.
364  */
365 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
366 {
367         struct ircomm_tty_cb *self;
368         unsigned int line;
369         unsigned long   flags;
370         int ret;
371
372         IRDA_DEBUG(2, "%s()\n", __func__ );
373
374         line = tty->index;
375         if (line >= IRCOMM_TTY_PORTS)
376                 return -ENODEV;
377
378         /* Check if instance already exists */
379         self = hashbin_lock_find(ircomm_tty, line, NULL);
380         if (!self) {
381                 /* No, so make new instance */
382                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
383                 if (self == NULL) {
384                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
385                         return -ENOMEM;
386                 }
387
388                 self->magic = IRCOMM_TTY_MAGIC;
389                 self->flow = FLOW_STOP;
390
391                 self->line = line;
392                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
393                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
394                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
395                 self->close_delay = 5*HZ/10;
396                 self->closing_wait = 30*HZ;
397
398                 /* Init some important stuff */
399                 init_timer(&self->watchdog_timer);
400                 init_waitqueue_head(&self->open_wait);
401                 init_waitqueue_head(&self->close_wait);
402                 spin_lock_init(&self->spinlock);
403
404                 /*
405                  * Force TTY into raw mode by default which is usually what
406                  * we want for IrCOMM and IrLPT. This way applications will
407                  * not have to twiddle with printcap etc.
408                  *
409                  * Note this is completely usafe and doesn't work properly
410                  */
411                 tty->termios->c_iflag = 0;
412                 tty->termios->c_oflag = 0;
413
414                 /* Insert into hash */
415                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
416         }
417         /* ++ is not atomic, so this should be protected - Jean II */
418         spin_lock_irqsave(&self->spinlock, flags);
419         self->open_count++;
420
421         tty->driver_data = self;
422         self->tty = tty;
423         spin_unlock_irqrestore(&self->spinlock, flags);
424
425         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
426                    self->line, self->open_count);
427
428         /* Not really used by us, but lets do it anyway */
429         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
430
431         /*
432          * If the port is the middle of closing, bail out now
433          */
434         if (tty_hung_up_p(filp) ||
435             test_bit(ASYNC_B_CLOSING, &self->flags)) {
436
437                 /* Hm, why are we blocking on ASYNC_CLOSING if we
438                  * do return -EAGAIN/-ERESTARTSYS below anyway?
439                  * IMHO it's either not needed in the first place
440                  * or for some reason we need to make sure the async
441                  * closing has been finished - if so, wouldn't we
442                  * probably better sleep uninterruptible?
443                  */
444
445                 if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) {
446                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
447                                      __func__);
448                         return -ERESTARTSYS;
449                 }
450
451 #ifdef SERIAL_DO_RESTART
452                 return ((self->flags & ASYNC_HUP_NOTIFY) ?
453                         -EAGAIN : -ERESTARTSYS);
454 #else
455                 return -EAGAIN;
456 #endif
457         }
458
459         /* Check if this is a "normal" ircomm device, or an irlpt device */
460         if (line < 0x10) {
461                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
462                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
463                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
464                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
465                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
466         } else {
467                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
468                 self->service_type = IRCOMM_3_WIRE_RAW;
469                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
470         }
471
472         ret = ircomm_tty_startup(self);
473         if (ret)
474                 return ret;
475
476         ret = ircomm_tty_block_til_ready(self, filp);
477         if (ret) {
478                 IRDA_DEBUG(2,
479                       "%s(), returning after block_til_ready with %d\n", __func__ ,
480                       ret);
481
482                 return ret;
483         }
484         return 0;
485 }
486
487 /*
488  * Function ircomm_tty_close (tty, filp)
489  *
490  *    This routine is called when a particular tty device is closed.
491  *
492  */
493 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
494 {
495         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
496         unsigned long flags;
497
498         IRDA_DEBUG(0, "%s()\n", __func__ );
499
500         IRDA_ASSERT(self != NULL, return;);
501         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
502
503         spin_lock_irqsave(&self->spinlock, flags);
504
505         if (tty_hung_up_p(filp)) {
506                 spin_unlock_irqrestore(&self->spinlock, flags);
507
508                 IRDA_DEBUG(0, "%s(), returning 1\n", __func__ );
509                 return;
510         }
511
512         if ((tty->count == 1) && (self->open_count != 1)) {
513                 /*
514                  * Uh, oh.  tty->count is 1, which means that the tty
515                  * structure will be freed.  state->count should always
516                  * be one in these conditions.  If it's greater than
517                  * one, we've got real problems, since it means the
518                  * serial port won't be shutdown.
519                  */
520                 IRDA_DEBUG(0, "%s(), bad serial port count; "
521                            "tty->count is 1, state->count is %d\n", __func__ ,
522                            self->open_count);
523                 self->open_count = 1;
524         }
525
526         if (--self->open_count < 0) {
527                 IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n",
528                            __func__, self->line, self->open_count);
529                 self->open_count = 0;
530         }
531         if (self->open_count) {
532                 spin_unlock_irqrestore(&self->spinlock, flags);
533
534                 IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ );
535                 return;
536         }
537
538         /* Hum... Should be test_and_set_bit ??? - Jean II */
539         set_bit(ASYNC_B_CLOSING, &self->flags);
540
541         /* We need to unlock here (we were unlocking at the end of this
542          * function), because tty_wait_until_sent() may schedule.
543          * I don't know if the rest should be protected somehow,
544          * so someone should check. - Jean II */
545         spin_unlock_irqrestore(&self->spinlock, flags);
546
547         /*
548          * Now we wait for the transmit buffer to clear; and we notify
549          * the line discipline to only process XON/XOFF characters.
550          */
551         tty->closing = 1;
552         if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
553                 tty_wait_until_sent(tty, self->closing_wait);
554
555         ircomm_tty_shutdown(self);
556
557         tty_driver_flush_buffer(tty);
558         tty_ldisc_flush(tty);
559
560         tty->closing = 0;
561         self->tty = NULL;
562
563         if (self->blocked_open) {
564                 if (self->close_delay)
565                         schedule_timeout_interruptible(self->close_delay);
566                 wake_up_interruptible(&self->open_wait);
567         }
568
569         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
570         wake_up_interruptible(&self->close_wait);
571 }
572
573 /*
574  * Function ircomm_tty_flush_buffer (tty)
575  *
576  *
577  *
578  */
579 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
580 {
581         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
582
583         IRDA_ASSERT(self != NULL, return;);
584         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
585
586         /*
587          * Let do_softint() do this to avoid race condition with
588          * do_softint() ;-)
589          */
590         schedule_work(&self->tqueue);
591 }
592
593 /*
594  * Function ircomm_tty_do_softint (work)
595  *
596  *    We use this routine to give the write wakeup to the user at at a
597  *    safe time (as fast as possible after write have completed). This
598  *    can be compared to the Tx interrupt.
599  */
600 static void ircomm_tty_do_softint(struct work_struct *work)
601 {
602         struct ircomm_tty_cb *self =
603                 container_of(work, struct ircomm_tty_cb, tqueue);
604         struct tty_struct *tty;
605         unsigned long flags;
606         struct sk_buff *skb, *ctrl_skb;
607
608         IRDA_DEBUG(2, "%s()\n", __func__ );
609
610         if (!self || self->magic != IRCOMM_TTY_MAGIC)
611                 return;
612
613         tty = self->tty;
614         if (!tty)
615                 return;
616
617         /* Unlink control buffer */
618         spin_lock_irqsave(&self->spinlock, flags);
619
620         ctrl_skb = self->ctrl_skb;
621         self->ctrl_skb = NULL;
622
623         spin_unlock_irqrestore(&self->spinlock, flags);
624
625         /* Flush control buffer if any */
626         if(ctrl_skb) {
627                 if(self->flow == FLOW_START)
628                         ircomm_control_request(self->ircomm, ctrl_skb);
629                 /* Drop reference count - see ircomm_ttp_data_request(). */
630                 dev_kfree_skb(ctrl_skb);
631         }
632
633         if (tty->hw_stopped)
634                 return;
635
636         /* Unlink transmit buffer */
637         spin_lock_irqsave(&self->spinlock, flags);
638
639         skb = self->tx_skb;
640         self->tx_skb = NULL;
641
642         spin_unlock_irqrestore(&self->spinlock, flags);
643
644         /* Flush transmit buffer if any */
645         if (skb) {
646                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
647                 /* Drop reference count - see ircomm_ttp_data_request(). */
648                 dev_kfree_skb(skb);
649         }
650
651         /* Check if user (still) wants to be waken up */
652         tty_wakeup(tty);
653 }
654
655 /*
656  * Function ircomm_tty_write (tty, buf, count)
657  *
658  *    This routine is called by the kernel to write a series of characters
659  *    to the tty device. The characters may come from user space or kernel
660  *    space. This routine will return the number of characters actually
661  *    accepted for writing. This routine is mandatory.
662  */
663 static int ircomm_tty_write(struct tty_struct *tty,
664                             const unsigned char *buf, int count)
665 {
666         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
667         unsigned long flags;
668         struct sk_buff *skb;
669         int tailroom = 0;
670         int len = 0;
671         int size;
672
673         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
674                    tty->hw_stopped);
675
676         IRDA_ASSERT(self != NULL, return -1;);
677         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
678
679         /* We may receive packets from the TTY even before we have finished
680          * our setup. Not cool.
681          * The problem is that we don't know the final header and data size
682          * to create the proper skb, so any skb we would create would have
683          * bogus header and data size, so need care.
684          * We use a bogus header size to safely detect this condition.
685          * Another problem is that hw_stopped was set to 0 way before it
686          * should be, so we would drop this skb. It should now be fixed.
687          * One option is to not accept data until we are properly setup.
688          * But, I suspect that when it happens, the ppp line discipline
689          * just "drops" the data, which might screw up connect scripts.
690          * The second option is to create a "safe skb", with large header
691          * and small size (see ircomm_tty_open() for values).
692          * We just need to make sure that when the real values get filled,
693          * we don't mess up the original "safe skb" (see tx_data_size).
694          * Jean II */
695         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
696                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
697 #ifdef IRCOMM_NO_TX_BEFORE_INIT
698                 /* We didn't consume anything, TTY will retry */
699                 return 0;
700 #endif
701         }
702
703         if (count < 1)
704                 return 0;
705
706         /* Protect our manipulation of self->tx_skb and related */
707         spin_lock_irqsave(&self->spinlock, flags);
708
709         /* Fetch current transmit buffer */
710         skb = self->tx_skb;
711
712         /*
713          * Send out all the data we get, possibly as multiple fragmented
714          * frames, but this will only happen if the data is larger than the
715          * max data size. The normal case however is just the opposite, and
716          * this function may be called multiple times, and will then actually
717          * defragment the data and send it out as one packet as soon as
718          * possible, but at a safer point in time
719          */
720         while (count) {
721                 size = count;
722
723                 /* Adjust data size to the max data size */
724                 if (size > self->max_data_size)
725                         size = self->max_data_size;
726
727                 /*
728                  * Do we already have a buffer ready for transmit, or do
729                  * we need to allocate a new frame
730                  */
731                 if (skb) {
732                         /*
733                          * Any room for more data at the end of the current
734                          * transmit buffer? Cannot use skb_tailroom, since
735                          * dev_alloc_skb gives us a larger skb than we
736                          * requested
737                          * Note : use tx_data_size, because max_data_size
738                          * may have changed and we don't want to overwrite
739                          * the skb. - Jean II
740                          */
741                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
742                                 /* Adjust data to tailroom */
743                                 if (size > tailroom)
744                                         size = tailroom;
745                         } else {
746                                 /*
747                                  * Current transmit frame is full, so break
748                                  * out, so we can send it as soon as possible
749                                  */
750                                 break;
751                         }
752                 } else {
753                         /* Prepare a full sized frame */
754                         skb = alloc_skb(self->max_data_size+
755                                         self->max_header_size,
756                                         GFP_ATOMIC);
757                         if (!skb) {
758                                 spin_unlock_irqrestore(&self->spinlock, flags);
759                                 return -ENOBUFS;
760                         }
761                         skb_reserve(skb, self->max_header_size);
762                         self->tx_skb = skb;
763                         /* Remember skb size because max_data_size may
764                          * change later on - Jean II */
765                         self->tx_data_size = self->max_data_size;
766                 }
767
768                 /* Copy data */
769                 memcpy(skb_put(skb,size), buf + len, size);
770
771                 count -= size;
772                 len += size;
773         }
774
775         spin_unlock_irqrestore(&self->spinlock, flags);
776
777         /*
778          * Schedule a new thread which will transmit the frame as soon
779          * as possible, but at a safe point in time. We do this so the
780          * "user" can give us data multiple times, as PPP does (because of
781          * its 256 byte tx buffer). We will then defragment and send out
782          * all this data as one single packet.
783          */
784         schedule_work(&self->tqueue);
785
786         return len;
787 }
788
789 /*
790  * Function ircomm_tty_write_room (tty)
791  *
792  *    This routine returns the numbers of characters the tty driver will
793  *    accept for queuing to be written. This number is subject to change as
794  *    output buffers get emptied, or if the output flow control is acted.
795  */
796 static int ircomm_tty_write_room(struct tty_struct *tty)
797 {
798         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
799         unsigned long flags;
800         int ret;
801
802         IRDA_ASSERT(self != NULL, return -1;);
803         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
804
805 #ifdef IRCOMM_NO_TX_BEFORE_INIT
806         /* max_header_size tells us if the channel is initialised or not. */
807         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
808                 /* Don't bother us yet */
809                 return 0;
810 #endif
811
812         /* Check if we are allowed to transmit any data.
813          * hw_stopped is the regular flow control.
814          * Jean II */
815         if (tty->hw_stopped)
816                 ret = 0;
817         else {
818                 spin_lock_irqsave(&self->spinlock, flags);
819                 if (self->tx_skb)
820                         ret = self->tx_data_size - self->tx_skb->len;
821                 else
822                         ret = self->max_data_size;
823                 spin_unlock_irqrestore(&self->spinlock, flags);
824         }
825         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
826
827         return ret;
828 }
829
830 /*
831  * Function ircomm_tty_wait_until_sent (tty, timeout)
832  *
833  *    This routine waits until the device has written out all of the
834  *    characters in its transmitter FIFO.
835  */
836 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
837 {
838         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
839         unsigned long orig_jiffies, poll_time;
840         unsigned long flags;
841
842         IRDA_DEBUG(2, "%s()\n", __func__ );
843
844         IRDA_ASSERT(self != NULL, return;);
845         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
846
847         orig_jiffies = jiffies;
848
849         /* Set poll time to 200 ms */
850         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
851
852         spin_lock_irqsave(&self->spinlock, flags);
853         while (self->tx_skb && self->tx_skb->len) {
854                 spin_unlock_irqrestore(&self->spinlock, flags);
855                 schedule_timeout_interruptible(poll_time);
856                 spin_lock_irqsave(&self->spinlock, flags);
857                 if (signal_pending(current))
858                         break;
859                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
860                         break;
861         }
862         spin_unlock_irqrestore(&self->spinlock, flags);
863         current->state = TASK_RUNNING;
864 }
865
866 /*
867  * Function ircomm_tty_throttle (tty)
868  *
869  *    This routine notifies the tty driver that input buffers for the line
870  *    discipline are close to full, and it should somehow signal that no
871  *    more characters should be sent to the tty.
872  */
873 static void ircomm_tty_throttle(struct tty_struct *tty)
874 {
875         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
876
877         IRDA_DEBUG(2, "%s()\n", __func__ );
878
879         IRDA_ASSERT(self != NULL, return;);
880         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
881
882         /* Software flow control? */
883         if (I_IXOFF(tty))
884                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
885
886         /* Hardware flow control? */
887         if (tty->termios->c_cflag & CRTSCTS) {
888                 self->settings.dte &= ~IRCOMM_RTS;
889                 self->settings.dte |= IRCOMM_DELTA_RTS;
890
891                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
892         }
893
894         ircomm_flow_request(self->ircomm, FLOW_STOP);
895 }
896
897 /*
898  * Function ircomm_tty_unthrottle (tty)
899  *
900  *    This routine notifies the tty drivers that it should signals that
901  *    characters can now be sent to the tty without fear of overrunning the
902  *    input buffers of the line disciplines.
903  */
904 static void ircomm_tty_unthrottle(struct tty_struct *tty)
905 {
906         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
907
908         IRDA_DEBUG(2, "%s()\n", __func__ );
909
910         IRDA_ASSERT(self != NULL, return;);
911         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
912
913         /* Using software flow control? */
914         if (I_IXOFF(tty)) {
915                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
916         }
917
918         /* Using hardware flow control? */
919         if (tty->termios->c_cflag & CRTSCTS) {
920                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
921
922                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
923                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
924         }
925         ircomm_flow_request(self->ircomm, FLOW_START);
926 }
927
928 /*
929  * Function ircomm_tty_chars_in_buffer (tty)
930  *
931  *    Indicates if there are any data in the buffer
932  *
933  */
934 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
935 {
936         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
937         unsigned long flags;
938         int len = 0;
939
940         IRDA_ASSERT(self != NULL, return -1;);
941         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
942
943         spin_lock_irqsave(&self->spinlock, flags);
944
945         if (self->tx_skb)
946                 len = self->tx_skb->len;
947
948         spin_unlock_irqrestore(&self->spinlock, flags);
949
950         return len;
951 }
952
953 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
954 {
955         unsigned long flags;
956
957         IRDA_ASSERT(self != NULL, return;);
958         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
959
960         IRDA_DEBUG(0, "%s()\n", __func__ );
961
962         if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
963                 return;
964
965         ircomm_tty_detach_cable(self);
966
967         spin_lock_irqsave(&self->spinlock, flags);
968
969         del_timer(&self->watchdog_timer);
970
971         /* Free parameter buffer */
972         if (self->ctrl_skb) {
973                 dev_kfree_skb(self->ctrl_skb);
974                 self->ctrl_skb = NULL;
975         }
976
977         /* Free transmit buffer */
978         if (self->tx_skb) {
979                 dev_kfree_skb(self->tx_skb);
980                 self->tx_skb = NULL;
981         }
982
983         if (self->ircomm) {
984                 ircomm_close(self->ircomm);
985                 self->ircomm = NULL;
986         }
987
988         spin_unlock_irqrestore(&self->spinlock, flags);
989 }
990
991 /*
992  * Function ircomm_tty_hangup (tty)
993  *
994  *    This routine notifies the tty driver that it should hangup the tty
995  *    device.
996  *
997  */
998 static void ircomm_tty_hangup(struct tty_struct *tty)
999 {
1000         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1001         unsigned long   flags;
1002
1003         IRDA_DEBUG(0, "%s()\n", __func__ );
1004
1005         IRDA_ASSERT(self != NULL, return;);
1006         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1007
1008         /* ircomm_tty_flush_buffer(tty); */
1009         ircomm_tty_shutdown(self);
1010
1011         /* I guess we need to lock here - Jean II */
1012         spin_lock_irqsave(&self->spinlock, flags);
1013         self->flags &= ~ASYNC_NORMAL_ACTIVE;
1014         self->tty = NULL;
1015         self->open_count = 0;
1016         spin_unlock_irqrestore(&self->spinlock, flags);
1017
1018         wake_up_interruptible(&self->open_wait);
1019 }
1020
1021 /*
1022  * Function ircomm_tty_send_xchar (tty, ch)
1023  *
1024  *    This routine is used to send a high-priority XON/XOFF character to
1025  *    the device.
1026  */
1027 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1028 {
1029         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1030 }
1031
1032 /*
1033  * Function ircomm_tty_start (tty)
1034  *
1035  *    This routine notifies the tty driver that it resume sending
1036  *    characters to the tty device.
1037  */
1038 void ircomm_tty_start(struct tty_struct *tty)
1039 {
1040         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1041
1042         ircomm_flow_request(self->ircomm, FLOW_START);
1043 }
1044
1045 /*
1046  * Function ircomm_tty_stop (tty)
1047  *
1048  *     This routine notifies the tty driver that it should stop outputting
1049  *     characters to the tty device.
1050  */
1051 static void ircomm_tty_stop(struct tty_struct *tty)
1052 {
1053         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1054
1055         IRDA_ASSERT(self != NULL, return;);
1056         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1057
1058         ircomm_flow_request(self->ircomm, FLOW_STOP);
1059 }
1060
1061 /*
1062  * Function ircomm_check_modem_status (self)
1063  *
1064  *    Check for any changes in the DCE's line settings. This function should
1065  *    be called whenever the dce parameter settings changes, to update the
1066  *    flow control settings and other things
1067  */
1068 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1069 {
1070         struct tty_struct *tty;
1071         int status;
1072
1073         IRDA_DEBUG(0, "%s()\n", __func__ );
1074
1075         IRDA_ASSERT(self != NULL, return;);
1076         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1077
1078         tty = self->tty;
1079
1080         status = self->settings.dce;
1081
1082         if (status & IRCOMM_DCE_DELTA_ANY) {
1083                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1084         }
1085         if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1086                 IRDA_DEBUG(2,
1087                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1088                            (status & IRCOMM_CD) ? "on" : "off");
1089
1090                 if (status & IRCOMM_CD) {
1091                         wake_up_interruptible(&self->open_wait);
1092                 } else {
1093                         IRDA_DEBUG(2,
1094                                    "%s(), Doing serial hangup..\n", __func__ );
1095                         if (tty)
1096                                 tty_hangup(tty);
1097
1098                         /* Hangup will remote the tty, so better break out */
1099                         return;
1100                 }
1101         }
1102         if (self->flags & ASYNC_CTS_FLOW) {
1103                 if (tty->hw_stopped) {
1104                         if (status & IRCOMM_CTS) {
1105                                 IRDA_DEBUG(2,
1106                                            "%s(), CTS tx start...\n", __func__ );
1107                                 tty->hw_stopped = 0;
1108
1109                                 /* Wake up processes blocked on open */
1110                                 wake_up_interruptible(&self->open_wait);
1111
1112                                 schedule_work(&self->tqueue);
1113                                 return;
1114                         }
1115                 } else {
1116                         if (!(status & IRCOMM_CTS)) {
1117                                 IRDA_DEBUG(2,
1118                                            "%s(), CTS tx stop...\n", __func__ );
1119                                 tty->hw_stopped = 1;
1120                         }
1121                 }
1122         }
1123 }
1124
1125 /*
1126  * Function ircomm_tty_data_indication (instance, sap, skb)
1127  *
1128  *    Handle incoming data, and deliver it to the line discipline
1129  *
1130  */
1131 static int ircomm_tty_data_indication(void *instance, void *sap,
1132                                       struct sk_buff *skb)
1133 {
1134         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1135         struct tty_ldisc *ld;
1136
1137         IRDA_DEBUG(2, "%s()\n", __func__ );
1138
1139         IRDA_ASSERT(self != NULL, return -1;);
1140         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1141         IRDA_ASSERT(skb != NULL, return -1;);
1142
1143         if (!self->tty) {
1144                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1145                 return 0;
1146         }
1147
1148         /*
1149          * If we receive data when hardware is stopped then something is wrong.
1150          * We try to poll the peers line settings to check if we are up todate.
1151          * Devices like WinCE can do this, and since they don't send any
1152          * params, we can just as well declare the hardware for running.
1153          */
1154         if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1155                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1156                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1157
1158                 /* We can just as well declare the hardware for running */
1159                 ircomm_tty_send_initial_parameters(self);
1160                 ircomm_tty_link_established(self);
1161         }
1162
1163         /*
1164          * Just give it over to the line discipline. There is no need to
1165          * involve the flip buffers, since we are not running in an interrupt
1166          * handler
1167          */
1168
1169         ld = tty_ldisc_ref(self->tty);
1170         if (ld)
1171                 ld->ops->receive_buf(self->tty, skb->data, NULL, skb->len);
1172         tty_ldisc_deref(ld);
1173
1174         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1175
1176         return 0;
1177 }
1178
1179 /*
1180  * Function ircomm_tty_control_indication (instance, sap, skb)
1181  *
1182  *    Parse all incoming parameters (easy!)
1183  *
1184  */
1185 static int ircomm_tty_control_indication(void *instance, void *sap,
1186                                          struct sk_buff *skb)
1187 {
1188         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1189         int clen;
1190
1191         IRDA_DEBUG(4, "%s()\n", __func__ );
1192
1193         IRDA_ASSERT(self != NULL, return -1;);
1194         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1195         IRDA_ASSERT(skb != NULL, return -1;);
1196
1197         clen = skb->data[0];
1198
1199         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1200                                &ircomm_param_info);
1201
1202         /* No need to kfree_skb - see ircomm_control_indication() */
1203
1204         return 0;
1205 }
1206
1207 /*
1208  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1209  *
1210  *    This function is called by IrTTP when it wants us to slow down the
1211  *    transmission of data. We just mark the hardware as stopped, and wait
1212  *    for IrTTP to notify us that things are OK again.
1213  */
1214 static void ircomm_tty_flow_indication(void *instance, void *sap,
1215                                        LOCAL_FLOW cmd)
1216 {
1217         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1218         struct tty_struct *tty;
1219
1220         IRDA_ASSERT(self != NULL, return;);
1221         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1222
1223         tty = self->tty;
1224
1225         switch (cmd) {
1226         case FLOW_START:
1227                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1228                 tty->hw_stopped = 0;
1229
1230                 /* ircomm_tty_do_softint will take care of the rest */
1231                 schedule_work(&self->tqueue);
1232                 break;
1233         default:  /* If we get here, something is very wrong, better stop */
1234         case FLOW_STOP:
1235                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1236                 tty->hw_stopped = 1;
1237                 break;
1238         }
1239         self->flow = cmd;
1240 }
1241
1242 #ifdef CONFIG_PROC_FS
1243 static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
1244 {
1245         char sep;
1246
1247         seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
1248
1249         seq_puts(m, "Service type: ");
1250         if (self->service_type & IRCOMM_9_WIRE)
1251                 seq_puts(m, "9_WIRE");
1252         else if (self->service_type & IRCOMM_3_WIRE)
1253                 seq_puts(m, "3_WIRE");
1254         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1255                 seq_puts(m, "3_WIRE_RAW");
1256         else
1257                 seq_puts(m, "No common service type!\n");
1258         seq_putc(m, '\n');
1259
1260         seq_printf(m, "Port name: %s\n", self->settings.port_name);
1261
1262         seq_printf(m, "DTE status:");
1263         sep = ' ';
1264         if (self->settings.dte & IRCOMM_RTS) {
1265                 seq_printf(m, "%cRTS", sep);
1266                 sep = '|';
1267         }
1268         if (self->settings.dte & IRCOMM_DTR) {
1269                 seq_printf(m, "%cDTR", sep);
1270                 sep = '|';
1271         }
1272         seq_putc(m, '\n');
1273
1274         seq_puts(m, "DCE status:");
1275         sep = ' ';
1276         if (self->settings.dce & IRCOMM_CTS) {
1277                 seq_printf(m, "%cCTS", sep);
1278                 sep = '|';
1279         }
1280         if (self->settings.dce & IRCOMM_DSR) {
1281                 seq_printf(m, "%cDSR", sep);
1282                 sep = '|';
1283         }
1284         if (self->settings.dce & IRCOMM_CD) {
1285                 seq_printf(m, "%cCD", sep);
1286                 sep = '|';
1287         }
1288         if (self->settings.dce & IRCOMM_RI) {
1289                 seq_printf(m, "%cRI", sep);
1290                 sep = '|';
1291         }
1292         seq_putc(m, '\n');
1293
1294         seq_puts(m, "Configuration: ");
1295         if (!self->settings.null_modem)
1296                 seq_puts(m, "DTE <-> DCE\n");
1297         else
1298                 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
1299
1300         seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
1301
1302         seq_puts(m, "Flow control:");
1303         sep = ' ';
1304         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1305                 seq_printf(m, "%cXON_XOFF_IN", sep);
1306                 sep = '|';
1307         }
1308         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1309                 seq_printf(m, "%cXON_XOFF_OUT", sep);
1310                 sep = '|';
1311         }
1312         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1313                 seq_printf(m, "%cRTS_CTS_IN", sep);
1314                 sep = '|';
1315         }
1316         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1317                 seq_printf(m, "%cRTS_CTS_OUT", sep);
1318                 sep = '|';
1319         }
1320         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1321                 seq_printf(m, "%cDSR_DTR_IN", sep);
1322                 sep = '|';
1323         }
1324         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1325                 seq_printf(m, "%cDSR_DTR_OUT", sep);
1326                 sep = '|';
1327         }
1328         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1329                 seq_printf(m, "%cENQ_ACK_IN", sep);
1330                 sep = '|';
1331         }
1332         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1333                 seq_printf(m, "%cENQ_ACK_OUT", sep);
1334                 sep = '|';
1335         }
1336         seq_putc(m, '\n');
1337
1338         seq_puts(m, "Flags:");
1339         sep = ' ';
1340         if (self->flags & ASYNC_CTS_FLOW) {
1341                 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1342                 sep = '|';
1343         }
1344         if (self->flags & ASYNC_CHECK_CD) {
1345                 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1346                 sep = '|';
1347         }
1348         if (self->flags & ASYNC_INITIALIZED) {
1349                 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1350                 sep = '|';
1351         }
1352         if (self->flags & ASYNC_LOW_LATENCY) {
1353                 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1354                 sep = '|';
1355         }
1356         if (self->flags & ASYNC_CLOSING) {
1357                 seq_printf(m, "%cASYNC_CLOSING", sep);
1358                 sep = '|';
1359         }
1360         if (self->flags & ASYNC_NORMAL_ACTIVE) {
1361                 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1362                 sep = '|';
1363         }
1364         seq_putc(m, '\n');
1365
1366         seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1367         seq_printf(m, "Open count: %d\n", self->open_count);
1368         seq_printf(m, "Max data size: %d\n", self->max_data_size);
1369         seq_printf(m, "Max header size: %d\n", self->max_header_size);
1370
1371         if (self->tty)
1372                 seq_printf(m, "Hardware: %s\n",
1373                                self->tty->hw_stopped ? "Stopped" : "Running");
1374 }
1375
1376 static int ircomm_tty_proc_show(struct seq_file *m, void *v)
1377 {
1378         struct ircomm_tty_cb *self;
1379         unsigned long flags;
1380
1381         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1382
1383         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1384         while (self != NULL) {
1385                 if (self->magic != IRCOMM_TTY_MAGIC)
1386                         break;
1387
1388                 ircomm_tty_line_info(self, m);
1389                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1390         }
1391         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1392         return 0;
1393 }
1394
1395 static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1396 {
1397         return single_open(file, ircomm_tty_proc_show, NULL);
1398 }
1399
1400 static const struct file_operations ircomm_tty_proc_fops = {
1401         .owner          = THIS_MODULE,
1402         .open           = ircomm_tty_proc_open,
1403         .read           = seq_read,
1404         .llseek         = seq_lseek,
1405         .release        = single_release,
1406 };
1407 #endif /* CONFIG_PROC_FS */
1408
1409 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1410 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1411 MODULE_LICENSE("GPL");
1412 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1413
1414 module_init(ircomm_tty_init);
1415 module_exit(ircomm_tty_cleanup);