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