tty: Fix an ircomm warning and note another bug
[linux-2.6.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/sched.h>
37 #include <linux/termios.h>
38 #include <linux/tty.h>
39 #include <linux/interrupt.h>
40 #include <linux/device.h>               /* for MODULE_ALIAS_CHARDEV_MAJOR */
41
42 #include <asm/uaccess.h>
43
44 #include <net/irda/irda.h>
45 #include <net/irda/irmod.h>
46
47 #include <net/irda/ircomm_core.h>
48 #include <net/irda/ircomm_param.h>
49 #include <net/irda/ircomm_tty_attach.h>
50 #include <net/irda/ircomm_tty.h>
51
52 static int  ircomm_tty_open(struct tty_struct *tty, struct file *filp);
53 static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
54 static int  ircomm_tty_write(struct tty_struct * tty,
55                              const unsigned char *buf, int count);
56 static int  ircomm_tty_write_room(struct tty_struct *tty);
57 static void ircomm_tty_throttle(struct tty_struct *tty);
58 static void ircomm_tty_unthrottle(struct tty_struct *tty);
59 static int  ircomm_tty_chars_in_buffer(struct tty_struct *tty);
60 static void ircomm_tty_flush_buffer(struct tty_struct *tty);
61 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
62 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
63 static void ircomm_tty_hangup(struct tty_struct *tty);
64 static void ircomm_tty_do_softint(struct work_struct *work);
65 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
66 static void ircomm_tty_stop(struct tty_struct *tty);
67
68 static int ircomm_tty_data_indication(void *instance, void *sap,
69                                       struct sk_buff *skb);
70 static int ircomm_tty_control_indication(void *instance, void *sap,
71                                          struct sk_buff *skb);
72 static void ircomm_tty_flow_indication(void *instance, void *sap,
73                                        LOCAL_FLOW cmd);
74 #ifdef CONFIG_PROC_FS
75 static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
76                                 int *eof, void *unused);
77 #endif /* CONFIG_PROC_FS */
78 static struct tty_driver *driver;
79
80 static hashbin_t *ircomm_tty = NULL;
81
82 static const struct tty_operations ops = {
83         .open            = ircomm_tty_open,
84         .close           = ircomm_tty_close,
85         .write           = ircomm_tty_write,
86         .write_room      = ircomm_tty_write_room,
87         .chars_in_buffer = ircomm_tty_chars_in_buffer,
88         .flush_buffer    = ircomm_tty_flush_buffer,
89         .ioctl           = ircomm_tty_ioctl,    /* ircomm_tty_ioctl.c */
90         .tiocmget        = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
91         .tiocmset        = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
92         .throttle        = ircomm_tty_throttle,
93         .unthrottle      = ircomm_tty_unthrottle,
94         .send_xchar      = ircomm_tty_send_xchar,
95         .set_termios     = ircomm_tty_set_termios,
96         .stop            = ircomm_tty_stop,
97         .start           = ircomm_tty_start,
98         .hangup          = ircomm_tty_hangup,
99         .wait_until_sent = ircomm_tty_wait_until_sent,
100 #ifdef CONFIG_PROC_FS
101         .read_proc       = ircomm_tty_read_proc,
102 #endif /* CONFIG_PROC_FS */
103 };
104
105 /*
106  * Function ircomm_tty_init()
107  *
108  *    Init IrCOMM TTY layer/driver
109  *
110  */
111 static int __init ircomm_tty_init(void)
112 {
113         driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
114         if (!driver)
115                 return -ENOMEM;
116         ircomm_tty = hashbin_new(HB_LOCK);
117         if (ircomm_tty == NULL) {
118                 IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__);
119                 put_tty_driver(driver);
120                 return -ENOMEM;
121         }
122
123         driver->owner           = THIS_MODULE;
124         driver->driver_name     = "ircomm";
125         driver->name            = "ircomm";
126         driver->major           = IRCOMM_TTY_MAJOR;
127         driver->minor_start     = IRCOMM_TTY_MINOR;
128         driver->type            = TTY_DRIVER_TYPE_SERIAL;
129         driver->subtype         = SERIAL_TYPE_NORMAL;
130         driver->init_termios    = tty_std_termios;
131         driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
132         driver->flags           = TTY_DRIVER_REAL_RAW;
133         tty_set_operations(driver, &ops);
134         if (tty_register_driver(driver)) {
135                 IRDA_ERROR("%s(): Couldn't register serial driver\n",
136                            __func__);
137                 put_tty_driver(driver);
138                 return -1;
139         }
140         return 0;
141 }
142
143 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
144 {
145         IRDA_DEBUG(0, "%s()\n", __func__ );
146
147         IRDA_ASSERT(self != NULL, return;);
148         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
149
150         ircomm_tty_shutdown(self);
151
152         self->magic = 0;
153         kfree(self);
154 }
155
156 /*
157  * Function ircomm_tty_cleanup ()
158  *
159  *    Remove IrCOMM TTY layer/driver
160  *
161  */
162 static void __exit ircomm_tty_cleanup(void)
163 {
164         int ret;
165
166         IRDA_DEBUG(4, "%s()\n", __func__ );
167
168         ret = tty_unregister_driver(driver);
169         if (ret) {
170                 IRDA_ERROR("%s(), failed to unregister driver\n",
171                            __func__);
172                 return;
173         }
174
175         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
176         put_tty_driver(driver);
177 }
178
179 /*
180  * Function ircomm_startup (self)
181  *
182  *
183  *
184  */
185 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
186 {
187         notify_t notify;
188         int ret = -ENODEV;
189
190         IRDA_DEBUG(2, "%s()\n", __func__ );
191
192         IRDA_ASSERT(self != NULL, return -1;);
193         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
194
195         /* Check if already open */
196         if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) {
197                 IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ );
198                 return 0;
199         }
200
201         /* Register with IrCOMM */
202         irda_notify_init(&notify);
203         /* These callbacks we must handle ourselves */
204         notify.data_indication       = ircomm_tty_data_indication;
205         notify.udata_indication      = ircomm_tty_control_indication;
206         notify.flow_indication       = ircomm_tty_flow_indication;
207
208         /* Use the ircomm_tty interface for these ones */
209         notify.disconnect_indication = ircomm_tty_disconnect_indication;
210         notify.connect_confirm       = ircomm_tty_connect_confirm;
211         notify.connect_indication    = ircomm_tty_connect_indication;
212         strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
213         notify.instance = self;
214
215         if (!self->ircomm) {
216                 self->ircomm = ircomm_open(&notify, self->service_type,
217                                            self->line);
218         }
219         if (!self->ircomm)
220                 goto err;
221
222         self->slsap_sel = self->ircomm->slsap_sel;
223
224         /* Connect IrCOMM link with remote device */
225         ret = ircomm_tty_attach_cable(self);
226         if (ret < 0) {
227                 IRDA_ERROR("%s(), error attaching cable!\n", __func__);
228                 goto err;
229         }
230
231         return 0;
232 err:
233         clear_bit(ASYNC_B_INITIALIZED, &self->flags);
234         return ret;
235 }
236
237 /*
238  * Function ircomm_block_til_ready (self, filp)
239  *
240  *
241  *
242  */
243 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
244                                       struct file *filp)
245 {
246         DECLARE_WAITQUEUE(wait, current);
247         int             retval;
248         int             do_clocal = 0, extra_count = 0;
249         unsigned long   flags;
250         struct tty_struct *tty;
251
252         IRDA_DEBUG(2, "%s()\n", __func__ );
253
254         tty = self->tty;
255
256         /*
257          * If non-blocking mode is set, or the port is not enabled,
258          * then make the check up front and then exit.
259          */
260         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
261                 /* nonblock mode is set or port is not enabled */
262                 self->flags |= ASYNC_NORMAL_ACTIVE;
263                 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ );
264                 return 0;
265         }
266
267         if (tty->termios->c_cflag & CLOCAL) {
268                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ );
269                 do_clocal = 1;
270         }
271
272         /* Wait for carrier detect and the line to become
273          * free (i.e., not in use by the callout).  While we are in
274          * this loop, self->open_count is dropped by one, so that
275          * mgsl_close() knows when to free things.  We restore it upon
276          * exit, either normal or abnormal.
277          */
278
279         retval = 0;
280         add_wait_queue(&self->open_wait, &wait);
281
282         IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
283               __FILE__,__LINE__, tty->driver->name, self->open_count );
284
285         /* As far as I can see, we protect open_count - Jean II */
286         spin_lock_irqsave(&self->spinlock, flags);
287         if (!tty_hung_up_p(filp)) {
288                 extra_count = 1;
289                 self->open_count--;
290         }
291         spin_unlock_irqrestore(&self->spinlock, flags);
292         self->blocked_open++;
293
294         while (1) {
295                 if (tty->termios->c_cflag & CBAUD) {
296                         /* Here, we use to lock those two guys, but
297                          * as ircomm_param_request() does it itself,
298                          * I don't see the point (and I see the deadlock).
299                          * Jean II */
300                         self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR;
301
302                         ircomm_param_request(self, IRCOMM_DTE, TRUE);
303                 }
304
305                 current->state = TASK_INTERRUPTIBLE;
306
307                 if (tty_hung_up_p(filp) ||
308                     !test_bit(ASYNC_B_INITIALIZED, &self->flags)) {
309                         retval = (self->flags & ASYNC_HUP_NOTIFY) ?
310                                         -EAGAIN : -ERESTARTSYS;
311                         break;
312                 }
313
314                 /*
315                  * Check if link is ready now. Even if CLOCAL is
316                  * specified, we cannot return before the IrCOMM link is
317                  * ready
318                  */
319                 if (!test_bit(ASYNC_B_CLOSING, &self->flags) &&
320                     (do_clocal || (self->settings.dce & IRCOMM_CD)) &&
321                     self->state == IRCOMM_TTY_READY)
322                 {
323                         break;
324                 }
325
326                 if (signal_pending(current)) {
327                         retval = -ERESTARTSYS;
328                         break;
329                 }
330
331                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
332                       __FILE__,__LINE__, tty->driver->name, self->open_count );
333
334                 schedule();
335         }
336
337         __set_current_state(TASK_RUNNING);
338         remove_wait_queue(&self->open_wait, &wait);
339
340         if (extra_count) {
341                 /* ++ is not atomic, so this should be protected - Jean II */
342                 spin_lock_irqsave(&self->spinlock, flags);
343                 self->open_count++;
344                 spin_unlock_irqrestore(&self->spinlock, flags);
345         }
346         self->blocked_open--;
347
348         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
349               __FILE__,__LINE__, tty->driver->name, self->open_count);
350
351         if (!retval)
352                 self->flags |= ASYNC_NORMAL_ACTIVE;
353
354         return retval;
355 }
356
357 /*
358  * Function ircomm_tty_open (tty, filp)
359  *
360  *    This routine is called when a particular tty device is opened. This
361  *    routine is mandatory; if this routine is not filled in, the attempted
362  *    open will fail with ENODEV.
363  */
364 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
365 {
366         struct ircomm_tty_cb *self;
367         unsigned int line;
368         unsigned long   flags;
369         int ret;
370
371         IRDA_DEBUG(2, "%s()\n", __func__ );
372
373         line = tty->index;
374         if (line >= IRCOMM_TTY_PORTS)
375                 return -ENODEV;
376
377         /* Check if instance already exists */
378         self = hashbin_lock_find(ircomm_tty, line, NULL);
379         if (!self) {
380                 /* No, so make new instance */
381                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
382                 if (self == NULL) {
383                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
384                         return -ENOMEM;
385                 }
386
387                 self->magic = IRCOMM_TTY_MAGIC;
388                 self->flow = FLOW_STOP;
389
390                 self->line = line;
391                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
392                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
393                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
394                 self->close_delay = 5*HZ/10;
395                 self->closing_wait = 30*HZ;
396
397                 /* Init some important stuff */
398                 init_timer(&self->watchdog_timer);
399                 init_waitqueue_head(&self->open_wait);
400                 init_waitqueue_head(&self->close_wait);
401                 spin_lock_init(&self->spinlock);
402
403                 /*
404                  * Force TTY into raw mode by default which is usually what
405                  * we want for IrCOMM and IrLPT. This way applications will
406                  * not have to twiddle with printcap etc.
407                  *
408                  * Note this is completely usafe and doesn't work properly
409                  */
410                 tty->termios->c_iflag = 0;
411                 tty->termios->c_oflag = 0;
412
413                 /* Insert into hash */
414                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
415         }
416         /* ++ is not atomic, so this should be protected - Jean II */
417         spin_lock_irqsave(&self->spinlock, flags);
418         self->open_count++;
419
420         tty->driver_data = self;
421         self->tty = tty;
422         spin_unlock_irqrestore(&self->spinlock, flags);
423
424         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
425                    self->line, self->open_count);
426
427         /* Not really used by us, but lets do it anyway */
428         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
429
430         /*
431          * If the port is the middle of closing, bail out now
432          */
433         if (tty_hung_up_p(filp) ||
434             test_bit(ASYNC_B_CLOSING, &self->flags)) {
435
436                 /* Hm, why are we blocking on ASYNC_CLOSING if we
437                  * do return -EAGAIN/-ERESTARTSYS below anyway?
438                  * IMHO it's either not needed in the first place
439                  * or for some reason we need to make sure the async
440                  * closing has been finished - if so, wouldn't we
441                  * probably better sleep uninterruptible?
442                  */
443
444                 if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) {
445                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
446                                      __func__);
447                         return -ERESTARTSYS;
448                 }
449
450 #ifdef SERIAL_DO_RESTART
451                 return ((self->flags & ASYNC_HUP_NOTIFY) ?
452                         -EAGAIN : -ERESTARTSYS);
453 #else
454                 return -EAGAIN;
455 #endif
456         }
457
458         /* Check if this is a "normal" ircomm device, or an irlpt device */
459         if (line < 0x10) {
460                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
461                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
462                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
463                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
464                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
465         } else {
466                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
467                 self->service_type = IRCOMM_3_WIRE_RAW;
468                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
469         }
470
471         ret = ircomm_tty_startup(self);
472         if (ret)
473                 return ret;
474
475         ret = ircomm_tty_block_til_ready(self, filp);
476         if (ret) {
477                 IRDA_DEBUG(2,
478                       "%s(), returning after block_til_ready with %d\n", __func__ ,
479                       ret);
480
481                 return ret;
482         }
483         return 0;
484 }
485
486 /*
487  * Function ircomm_tty_close (tty, filp)
488  *
489  *    This routine is called when a particular tty device is closed.
490  *
491  */
492 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
493 {
494         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
495         unsigned long flags;
496
497         IRDA_DEBUG(0, "%s()\n", __func__ );
498
499         if (!tty)
500                 return;
501
502         IRDA_ASSERT(self != NULL, return;);
503         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
504
505         spin_lock_irqsave(&self->spinlock, flags);
506
507         if (tty_hung_up_p(filp)) {
508                 spin_unlock_irqrestore(&self->spinlock, flags);
509
510                 IRDA_DEBUG(0, "%s(), returning 1\n", __func__ );
511                 return;
512         }
513
514         if ((tty->count == 1) && (self->open_count != 1)) {
515                 /*
516                  * Uh, oh.  tty->count is 1, which means that the tty
517                  * structure will be freed.  state->count should always
518                  * be one in these conditions.  If it's greater than
519                  * one, we've got real problems, since it means the
520                  * serial port won't be shutdown.
521                  */
522                 IRDA_DEBUG(0, "%s(), bad serial port count; "
523                            "tty->count is 1, state->count is %d\n", __func__ ,
524                            self->open_count);
525                 self->open_count = 1;
526         }
527
528         if (--self->open_count < 0) {
529                 IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n",
530                            __func__, self->line, self->open_count);
531                 self->open_count = 0;
532         }
533         if (self->open_count) {
534                 spin_unlock_irqrestore(&self->spinlock, flags);
535
536                 IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ );
537                 return;
538         }
539
540         /* Hum... Should be test_and_set_bit ??? - Jean II */
541         set_bit(ASYNC_B_CLOSING, &self->flags);
542
543         /* We need to unlock here (we were unlocking at the end of this
544          * function), because tty_wait_until_sent() may schedule.
545          * I don't know if the rest should be protected somehow,
546          * so someone should check. - Jean II */
547         spin_unlock_irqrestore(&self->spinlock, flags);
548
549         /*
550          * Now we wait for the transmit buffer to clear; and we notify
551          * the line discipline to only process XON/XOFF characters.
552          */
553         tty->closing = 1;
554         if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
555                 tty_wait_until_sent(tty, self->closing_wait);
556
557         ircomm_tty_shutdown(self);
558
559         tty_driver_flush_buffer(tty);
560         tty_ldisc_flush(tty);
561
562         tty->closing = 0;
563         self->tty = NULL;
564
565         if (self->blocked_open) {
566                 if (self->close_delay)
567                         schedule_timeout_interruptible(self->close_delay);
568                 wake_up_interruptible(&self->open_wait);
569         }
570
571         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
572         wake_up_interruptible(&self->close_wait);
573 }
574
575 /*
576  * Function ircomm_tty_flush_buffer (tty)
577  *
578  *
579  *
580  */
581 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
582 {
583         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
584
585         IRDA_ASSERT(self != NULL, return;);
586         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
587
588         /*
589          * Let do_softint() do this to avoid race condition with
590          * do_softint() ;-)
591          */
592         schedule_work(&self->tqueue);
593 }
594
595 /*
596  * Function ircomm_tty_do_softint (work)
597  *
598  *    We use this routine to give the write wakeup to the user at at a
599  *    safe time (as fast as possible after write have completed). This
600  *    can be compared to the Tx interrupt.
601  */
602 static void ircomm_tty_do_softint(struct work_struct *work)
603 {
604         struct ircomm_tty_cb *self =
605                 container_of(work, struct ircomm_tty_cb, tqueue);
606         struct tty_struct *tty;
607         unsigned long flags;
608         struct sk_buff *skb, *ctrl_skb;
609
610         IRDA_DEBUG(2, "%s()\n", __func__ );
611
612         if (!self || self->magic != IRCOMM_TTY_MAGIC)
613                 return;
614
615         tty = self->tty;
616         if (!tty)
617                 return;
618
619         /* Unlink control buffer */
620         spin_lock_irqsave(&self->spinlock, flags);
621
622         ctrl_skb = self->ctrl_skb;
623         self->ctrl_skb = NULL;
624
625         spin_unlock_irqrestore(&self->spinlock, flags);
626
627         /* Flush control buffer if any */
628         if(ctrl_skb) {
629                 if(self->flow == FLOW_START)
630                         ircomm_control_request(self->ircomm, ctrl_skb);
631                 /* Drop reference count - see ircomm_ttp_data_request(). */
632                 dev_kfree_skb(ctrl_skb);
633         }
634
635         if (tty->hw_stopped)
636                 return;
637
638         /* Unlink transmit buffer */
639         spin_lock_irqsave(&self->spinlock, flags);
640
641         skb = self->tx_skb;
642         self->tx_skb = NULL;
643
644         spin_unlock_irqrestore(&self->spinlock, flags);
645
646         /* Flush transmit buffer if any */
647         if (skb) {
648                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
649                 /* Drop reference count - see ircomm_ttp_data_request(). */
650                 dev_kfree_skb(skb);
651         }
652
653         /* Check if user (still) wants to be waken up */
654         tty_wakeup(tty);
655 }
656
657 /*
658  * Function ircomm_tty_write (tty, buf, count)
659  *
660  *    This routine is called by the kernel to write a series of characters
661  *    to the tty device. The characters may come from user space or kernel
662  *    space. This routine will return the number of characters actually
663  *    accepted for writing. This routine is mandatory.
664  */
665 static int ircomm_tty_write(struct tty_struct *tty,
666                             const unsigned char *buf, int count)
667 {
668         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
669         unsigned long flags;
670         struct sk_buff *skb;
671         int tailroom = 0;
672         int len = 0;
673         int size;
674
675         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
676                    tty->hw_stopped);
677
678         IRDA_ASSERT(self != NULL, return -1;);
679         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
680
681         /* We may receive packets from the TTY even before we have finished
682          * our setup. Not cool.
683          * The problem is that we don't know the final header and data size
684          * to create the proper skb, so any skb we would create would have
685          * bogus header and data size, so need care.
686          * We use a bogus header size to safely detect this condition.
687          * Another problem is that hw_stopped was set to 0 way before it
688          * should be, so we would drop this skb. It should now be fixed.
689          * One option is to not accept data until we are properly setup.
690          * But, I suspect that when it happens, the ppp line discipline
691          * just "drops" the data, which might screw up connect scripts.
692          * The second option is to create a "safe skb", with large header
693          * and small size (see ircomm_tty_open() for values).
694          * We just need to make sure that when the real values get filled,
695          * we don't mess up the original "safe skb" (see tx_data_size).
696          * Jean II */
697         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
698                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
699 #ifdef IRCOMM_NO_TX_BEFORE_INIT
700                 /* We didn't consume anything, TTY will retry */
701                 return 0;
702 #endif
703         }
704
705         if (count < 1)
706                 return 0;
707
708         /* Protect our manipulation of self->tx_skb and related */
709         spin_lock_irqsave(&self->spinlock, flags);
710
711         /* Fetch current transmit buffer */
712         skb = self->tx_skb;
713
714         /*
715          * Send out all the data we get, possibly as multiple fragmented
716          * frames, but this will only happen if the data is larger than the
717          * max data size. The normal case however is just the opposite, and
718          * this function may be called multiple times, and will then actually
719          * defragment the data and send it out as one packet as soon as
720          * possible, but at a safer point in time
721          */
722         while (count) {
723                 size = count;
724
725                 /* Adjust data size to the max data size */
726                 if (size > self->max_data_size)
727                         size = self->max_data_size;
728
729                 /*
730                  * Do we already have a buffer ready for transmit, or do
731                  * we need to allocate a new frame
732                  */
733                 if (skb) {
734                         /*
735                          * Any room for more data at the end of the current
736                          * transmit buffer? Cannot use skb_tailroom, since
737                          * dev_alloc_skb gives us a larger skb than we
738                          * requested
739                          * Note : use tx_data_size, because max_data_size
740                          * may have changed and we don't want to overwrite
741                          * the skb. - Jean II
742                          */
743                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
744                                 /* Adjust data to tailroom */
745                                 if (size > tailroom)
746                                         size = tailroom;
747                         } else {
748                                 /*
749                                  * Current transmit frame is full, so break
750                                  * out, so we can send it as soon as possible
751                                  */
752                                 break;
753                         }
754                 } else {
755                         /* Prepare a full sized frame */
756                         skb = alloc_skb(self->max_data_size+
757                                         self->max_header_size,
758                                         GFP_ATOMIC);
759                         if (!skb) {
760                                 spin_unlock_irqrestore(&self->spinlock, flags);
761                                 return -ENOBUFS;
762                         }
763                         skb_reserve(skb, self->max_header_size);
764                         self->tx_skb = skb;
765                         /* Remember skb size because max_data_size may
766                          * change later on - Jean II */
767                         self->tx_data_size = self->max_data_size;
768                 }
769
770                 /* Copy data */
771                 memcpy(skb_put(skb,size), buf + len, size);
772
773                 count -= size;
774                 len += size;
775         }
776
777         spin_unlock_irqrestore(&self->spinlock, flags);
778
779         /*
780          * Schedule a new thread which will transmit the frame as soon
781          * as possible, but at a safe point in time. We do this so the
782          * "user" can give us data multiple times, as PPP does (because of
783          * its 256 byte tx buffer). We will then defragment and send out
784          * all this data as one single packet.
785          */
786         schedule_work(&self->tqueue);
787
788         return len;
789 }
790
791 /*
792  * Function ircomm_tty_write_room (tty)
793  *
794  *    This routine returns the numbers of characters the tty driver will
795  *    accept for queuing to be written. This number is subject to change as
796  *    output buffers get emptied, or if the output flow control is acted.
797  */
798 static int ircomm_tty_write_room(struct tty_struct *tty)
799 {
800         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
801         unsigned long flags;
802         int ret;
803
804         IRDA_ASSERT(self != NULL, return -1;);
805         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
806
807 #ifdef IRCOMM_NO_TX_BEFORE_INIT
808         /* max_header_size tells us if the channel is initialised or not. */
809         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
810                 /* Don't bother us yet */
811                 return 0;
812 #endif
813
814         /* Check if we are allowed to transmit any data.
815          * hw_stopped is the regular flow control.
816          * Jean II */
817         if (tty->hw_stopped)
818                 ret = 0;
819         else {
820                 spin_lock_irqsave(&self->spinlock, flags);
821                 if (self->tx_skb)
822                         ret = self->tx_data_size - self->tx_skb->len;
823                 else
824                         ret = self->max_data_size;
825                 spin_unlock_irqrestore(&self->spinlock, flags);
826         }
827         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
828
829         return ret;
830 }
831
832 /*
833  * Function ircomm_tty_wait_until_sent (tty, timeout)
834  *
835  *    This routine waits until the device has written out all of the
836  *    characters in its transmitter FIFO.
837  */
838 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
839 {
840         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
841         unsigned long orig_jiffies, poll_time;
842         unsigned long flags;
843
844         IRDA_DEBUG(2, "%s()\n", __func__ );
845
846         IRDA_ASSERT(self != NULL, return;);
847         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
848
849         orig_jiffies = jiffies;
850
851         /* Set poll time to 200 ms */
852         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
853
854         spin_lock_irqsave(&self->spinlock, flags);
855         while (self->tx_skb && self->tx_skb->len) {
856                 spin_unlock_irqrestore(&self->spinlock, flags);
857                 schedule_timeout_interruptible(poll_time);
858                 spin_lock_irqsave(&self->spinlock, flags);
859                 if (signal_pending(current))
860                         break;
861                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
862                         break;
863         }
864         spin_unlock_irqrestore(&self->spinlock, flags);
865         current->state = TASK_RUNNING;
866 }
867
868 /*
869  * Function ircomm_tty_throttle (tty)
870  *
871  *    This routine notifies the tty driver that input buffers for the line
872  *    discipline are close to full, and it should somehow signal that no
873  *    more characters should be sent to the tty.
874  */
875 static void ircomm_tty_throttle(struct tty_struct *tty)
876 {
877         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
878
879         IRDA_DEBUG(2, "%s()\n", __func__ );
880
881         IRDA_ASSERT(self != NULL, return;);
882         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
883
884         /* Software flow control? */
885         if (I_IXOFF(tty))
886                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
887
888         /* Hardware flow control? */
889         if (tty->termios->c_cflag & CRTSCTS) {
890                 self->settings.dte &= ~IRCOMM_RTS;
891                 self->settings.dte |= IRCOMM_DELTA_RTS;
892
893                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
894         }
895
896         ircomm_flow_request(self->ircomm, FLOW_STOP);
897 }
898
899 /*
900  * Function ircomm_tty_unthrottle (tty)
901  *
902  *    This routine notifies the tty drivers that it should signals that
903  *    characters can now be sent to the tty without fear of overrunning the
904  *    input buffers of the line disciplines.
905  */
906 static void ircomm_tty_unthrottle(struct tty_struct *tty)
907 {
908         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
909
910         IRDA_DEBUG(2, "%s()\n", __func__ );
911
912         IRDA_ASSERT(self != NULL, return;);
913         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
914
915         /* Using software flow control? */
916         if (I_IXOFF(tty)) {
917                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
918         }
919
920         /* Using hardware flow control? */
921         if (tty->termios->c_cflag & CRTSCTS) {
922                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
923
924                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
925                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
926         }
927         ircomm_flow_request(self->ircomm, FLOW_START);
928 }
929
930 /*
931  * Function ircomm_tty_chars_in_buffer (tty)
932  *
933  *    Indicates if there are any data in the buffer
934  *
935  */
936 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
937 {
938         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
939         unsigned long flags;
940         int len = 0;
941
942         IRDA_ASSERT(self != NULL, return -1;);
943         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
944
945         spin_lock_irqsave(&self->spinlock, flags);
946
947         if (self->tx_skb)
948                 len = self->tx_skb->len;
949
950         spin_unlock_irqrestore(&self->spinlock, flags);
951
952         return len;
953 }
954
955 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
956 {
957         unsigned long flags;
958
959         IRDA_ASSERT(self != NULL, return;);
960         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
961
962         IRDA_DEBUG(0, "%s()\n", __func__ );
963
964         if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
965                 return;
966
967         ircomm_tty_detach_cable(self);
968
969         spin_lock_irqsave(&self->spinlock, flags);
970
971         del_timer(&self->watchdog_timer);
972
973         /* Free parameter buffer */
974         if (self->ctrl_skb) {
975                 dev_kfree_skb(self->ctrl_skb);
976                 self->ctrl_skb = NULL;
977         }
978
979         /* Free transmit buffer */
980         if (self->tx_skb) {
981                 dev_kfree_skb(self->tx_skb);
982                 self->tx_skb = NULL;
983         }
984
985         if (self->ircomm) {
986                 ircomm_close(self->ircomm);
987                 self->ircomm = NULL;
988         }
989
990         spin_unlock_irqrestore(&self->spinlock, flags);
991 }
992
993 /*
994  * Function ircomm_tty_hangup (tty)
995  *
996  *    This routine notifies the tty driver that it should hangup the tty
997  *    device.
998  *
999  */
1000 static void ircomm_tty_hangup(struct tty_struct *tty)
1001 {
1002         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1003         unsigned long   flags;
1004
1005         IRDA_DEBUG(0, "%s()\n", __func__ );
1006
1007         IRDA_ASSERT(self != NULL, return;);
1008         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1009
1010         if (!tty)
1011                 return;
1012
1013         /* ircomm_tty_flush_buffer(tty); */
1014         ircomm_tty_shutdown(self);
1015
1016         /* I guess we need to lock here - Jean II */
1017         spin_lock_irqsave(&self->spinlock, flags);
1018         self->flags &= ~ASYNC_NORMAL_ACTIVE;
1019         self->tty = NULL;
1020         self->open_count = 0;
1021         spin_unlock_irqrestore(&self->spinlock, flags);
1022
1023         wake_up_interruptible(&self->open_wait);
1024 }
1025
1026 /*
1027  * Function ircomm_tty_send_xchar (tty, ch)
1028  *
1029  *    This routine is used to send a high-priority XON/XOFF character to
1030  *    the device.
1031  */
1032 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1033 {
1034         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1035 }
1036
1037 /*
1038  * Function ircomm_tty_start (tty)
1039  *
1040  *    This routine notifies the tty driver that it resume sending
1041  *    characters to the tty device.
1042  */
1043 void ircomm_tty_start(struct tty_struct *tty)
1044 {
1045         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1046
1047         ircomm_flow_request(self->ircomm, FLOW_START);
1048 }
1049
1050 /*
1051  * Function ircomm_tty_stop (tty)
1052  *
1053  *     This routine notifies the tty driver that it should stop outputting
1054  *     characters to the tty device.
1055  */
1056 static void ircomm_tty_stop(struct tty_struct *tty)
1057 {
1058         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1059
1060         IRDA_ASSERT(self != NULL, return;);
1061         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1062
1063         ircomm_flow_request(self->ircomm, FLOW_STOP);
1064 }
1065
1066 /*
1067  * Function ircomm_check_modem_status (self)
1068  *
1069  *    Check for any changes in the DCE's line settings. This function should
1070  *    be called whenever the dce parameter settings changes, to update the
1071  *    flow control settings and other things
1072  */
1073 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1074 {
1075         struct tty_struct *tty;
1076         int status;
1077
1078         IRDA_DEBUG(0, "%s()\n", __func__ );
1079
1080         IRDA_ASSERT(self != NULL, return;);
1081         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1082
1083         tty = self->tty;
1084
1085         status = self->settings.dce;
1086
1087         if (status & IRCOMM_DCE_DELTA_ANY) {
1088                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1089         }
1090         if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1091                 IRDA_DEBUG(2,
1092                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1093                            (status & IRCOMM_CD) ? "on" : "off");
1094
1095                 if (status & IRCOMM_CD) {
1096                         wake_up_interruptible(&self->open_wait);
1097                 } else {
1098                         IRDA_DEBUG(2,
1099                                    "%s(), Doing serial hangup..\n", __func__ );
1100                         if (tty)
1101                                 tty_hangup(tty);
1102
1103                         /* Hangup will remote the tty, so better break out */
1104                         return;
1105                 }
1106         }
1107         if (self->flags & ASYNC_CTS_FLOW) {
1108                 if (tty->hw_stopped) {
1109                         if (status & IRCOMM_CTS) {
1110                                 IRDA_DEBUG(2,
1111                                            "%s(), CTS tx start...\n", __func__ );
1112                                 tty->hw_stopped = 0;
1113
1114                                 /* Wake up processes blocked on open */
1115                                 wake_up_interruptible(&self->open_wait);
1116
1117                                 schedule_work(&self->tqueue);
1118                                 return;
1119                         }
1120                 } else {
1121                         if (!(status & IRCOMM_CTS)) {
1122                                 IRDA_DEBUG(2,
1123                                            "%s(), CTS tx stop...\n", __func__ );
1124                                 tty->hw_stopped = 1;
1125                         }
1126                 }
1127         }
1128 }
1129
1130 /*
1131  * Function ircomm_tty_data_indication (instance, sap, skb)
1132  *
1133  *    Handle incoming data, and deliver it to the line discipline
1134  *
1135  */
1136 static int ircomm_tty_data_indication(void *instance, void *sap,
1137                                       struct sk_buff *skb)
1138 {
1139         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1140         struct tty_ldisc *ld;
1141
1142         IRDA_DEBUG(2, "%s()\n", __func__ );
1143
1144         IRDA_ASSERT(self != NULL, return -1;);
1145         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1146         IRDA_ASSERT(skb != NULL, return -1;);
1147
1148         if (!self->tty) {
1149                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1150                 return 0;
1151         }
1152
1153         /*
1154          * If we receive data when hardware is stopped then something is wrong.
1155          * We try to poll the peers line settings to check if we are up todate.
1156          * Devices like WinCE can do this, and since they don't send any
1157          * params, we can just as well declare the hardware for running.
1158          */
1159         if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1160                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1161                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1162
1163                 /* We can just as well declare the hardware for running */
1164                 ircomm_tty_send_initial_parameters(self);
1165                 ircomm_tty_link_established(self);
1166         }
1167
1168         /*
1169          * Just give it over to the line discipline. There is no need to
1170          * involve the flip buffers, since we are not running in an interrupt
1171          * handler
1172          */
1173
1174         ld = tty_ldisc_ref(self->tty);
1175         if (ld)
1176                 ld->ops->receive_buf(self->tty, skb->data, NULL, skb->len);
1177         tty_ldisc_deref(ld);
1178
1179         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1180
1181         return 0;
1182 }
1183
1184 /*
1185  * Function ircomm_tty_control_indication (instance, sap, skb)
1186  *
1187  *    Parse all incoming parameters (easy!)
1188  *
1189  */
1190 static int ircomm_tty_control_indication(void *instance, void *sap,
1191                                          struct sk_buff *skb)
1192 {
1193         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1194         int clen;
1195
1196         IRDA_DEBUG(4, "%s()\n", __func__ );
1197
1198         IRDA_ASSERT(self != NULL, return -1;);
1199         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1200         IRDA_ASSERT(skb != NULL, return -1;);
1201
1202         clen = skb->data[0];
1203
1204         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1205                                &ircomm_param_info);
1206
1207         /* No need to kfree_skb - see ircomm_control_indication() */
1208
1209         return 0;
1210 }
1211
1212 /*
1213  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1214  *
1215  *    This function is called by IrTTP when it wants us to slow down the
1216  *    transmission of data. We just mark the hardware as stopped, and wait
1217  *    for IrTTP to notify us that things are OK again.
1218  */
1219 static void ircomm_tty_flow_indication(void *instance, void *sap,
1220                                        LOCAL_FLOW cmd)
1221 {
1222         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1223         struct tty_struct *tty;
1224
1225         IRDA_ASSERT(self != NULL, return;);
1226         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1227
1228         tty = self->tty;
1229
1230         switch (cmd) {
1231         case FLOW_START:
1232                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1233                 tty->hw_stopped = 0;
1234
1235                 /* ircomm_tty_do_softint will take care of the rest */
1236                 schedule_work(&self->tqueue);
1237                 break;
1238         default:  /* If we get here, something is very wrong, better stop */
1239         case FLOW_STOP:
1240                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1241                 tty->hw_stopped = 1;
1242                 break;
1243         }
1244         self->flow = cmd;
1245 }
1246
1247 #ifdef CONFIG_PROC_FS
1248 static int ircomm_tty_line_info(struct ircomm_tty_cb *self, char *buf)
1249 {
1250         int  ret=0;
1251
1252         ret += sprintf(buf+ret, "State: %s\n", ircomm_tty_state[self->state]);
1253
1254         ret += sprintf(buf+ret, "Service type: ");
1255         if (self->service_type & IRCOMM_9_WIRE)
1256                 ret += sprintf(buf+ret, "9_WIRE");
1257         else if (self->service_type & IRCOMM_3_WIRE)
1258                 ret += sprintf(buf+ret, "3_WIRE");
1259         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1260                 ret += sprintf(buf+ret, "3_WIRE_RAW");
1261         else
1262                 ret += sprintf(buf+ret, "No common service type!\n");
1263         ret += sprintf(buf+ret, "\n");
1264
1265         ret += sprintf(buf+ret, "Port name: %s\n", self->settings.port_name);
1266
1267         ret += sprintf(buf+ret, "DTE status: ");
1268         if (self->settings.dte & IRCOMM_RTS)
1269                 ret += sprintf(buf+ret, "RTS|");
1270         if (self->settings.dte & IRCOMM_DTR)
1271                 ret += sprintf(buf+ret, "DTR|");
1272         if (self->settings.dte)
1273                 ret--; /* remove the last | */
1274         ret += sprintf(buf+ret, "\n");
1275
1276         ret += sprintf(buf+ret, "DCE status: ");
1277         if (self->settings.dce & IRCOMM_CTS)
1278                 ret += sprintf(buf+ret, "CTS|");
1279         if (self->settings.dce & IRCOMM_DSR)
1280                 ret += sprintf(buf+ret, "DSR|");
1281         if (self->settings.dce & IRCOMM_CD)
1282                 ret += sprintf(buf+ret, "CD|");
1283         if (self->settings.dce & IRCOMM_RI)
1284                 ret += sprintf(buf+ret, "RI|");
1285         if (self->settings.dce)
1286                 ret--; /* remove the last | */
1287         ret += sprintf(buf+ret, "\n");
1288
1289         ret += sprintf(buf+ret, "Configuration: ");
1290         if (!self->settings.null_modem)
1291                 ret += sprintf(buf+ret, "DTE <-> DCE\n");
1292         else
1293                 ret += sprintf(buf+ret,
1294                                "DTE <-> DTE (null modem emulation)\n");
1295
1296         ret += sprintf(buf+ret, "Data rate: %d\n", self->settings.data_rate);
1297
1298         ret += sprintf(buf+ret, "Flow control: ");
1299         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN)
1300                 ret += sprintf(buf+ret, "XON_XOFF_IN|");
1301         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT)
1302                 ret += sprintf(buf+ret, "XON_XOFF_OUT|");
1303         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN)
1304                 ret += sprintf(buf+ret, "RTS_CTS_IN|");
1305         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT)
1306                 ret += sprintf(buf+ret, "RTS_CTS_OUT|");
1307         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN)
1308                 ret += sprintf(buf+ret, "DSR_DTR_IN|");
1309         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT)
1310                 ret += sprintf(buf+ret, "DSR_DTR_OUT|");
1311         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN)
1312                 ret += sprintf(buf+ret, "ENQ_ACK_IN|");
1313         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT)
1314                 ret += sprintf(buf+ret, "ENQ_ACK_OUT|");
1315         if (self->settings.flow_control)
1316                 ret--; /* remove the last | */
1317         ret += sprintf(buf+ret, "\n");
1318
1319         ret += sprintf(buf+ret, "Flags: ");
1320         if (self->flags & ASYNC_CTS_FLOW)
1321                 ret += sprintf(buf+ret, "ASYNC_CTS_FLOW|");
1322         if (self->flags & ASYNC_CHECK_CD)
1323                 ret += sprintf(buf+ret, "ASYNC_CHECK_CD|");
1324         if (self->flags & ASYNC_INITIALIZED)
1325                 ret += sprintf(buf+ret, "ASYNC_INITIALIZED|");
1326         if (self->flags & ASYNC_LOW_LATENCY)
1327                 ret += sprintf(buf+ret, "ASYNC_LOW_LATENCY|");
1328         if (self->flags & ASYNC_CLOSING)
1329                 ret += sprintf(buf+ret, "ASYNC_CLOSING|");
1330         if (self->flags & ASYNC_NORMAL_ACTIVE)
1331                 ret += sprintf(buf+ret, "ASYNC_NORMAL_ACTIVE|");
1332         if (self->flags)
1333                 ret--; /* remove the last | */
1334         ret += sprintf(buf+ret, "\n");
1335
1336         ret += sprintf(buf+ret, "Role: %s\n", self->client ?
1337                        "client" : "server");
1338         ret += sprintf(buf+ret, "Open count: %d\n", self->open_count);
1339         ret += sprintf(buf+ret, "Max data size: %d\n", self->max_data_size);
1340         ret += sprintf(buf+ret, "Max header size: %d\n", self->max_header_size);
1341
1342         if (self->tty)
1343                 ret += sprintf(buf+ret, "Hardware: %s\n",
1344                                self->tty->hw_stopped ? "Stopped" : "Running");
1345
1346         ret += sprintf(buf+ret, "\n");
1347         return ret;
1348 }
1349
1350
1351 /*
1352  * Function ircomm_tty_read_proc (buf, start, offset, len, eof, unused)
1353  *
1354  *
1355  *
1356  */
1357 static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
1358                                 int *eof, void *unused)
1359 {
1360         struct ircomm_tty_cb *self;
1361         int count = 0, l;
1362         off_t begin = 0;
1363         unsigned long flags;
1364
1365         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1366
1367         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1368         while ((self != NULL) && (count < 4000)) {
1369                 if (self->magic != IRCOMM_TTY_MAGIC)
1370                         break;
1371
1372                 l = ircomm_tty_line_info(self, buf + count);
1373                 count += l;
1374                 if (count+begin > offset+len)
1375                         goto done;
1376                 if (count+begin < offset) {
1377                         begin += count;
1378                         count = 0;
1379                 }
1380
1381                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1382         }
1383         *eof = 1;
1384 done:
1385         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1386
1387         if (offset >= count+begin)
1388                 return 0;
1389         *start = buf + (offset-begin);
1390         return ((len < begin+count-offset) ? len : begin+count-offset);
1391 }
1392 #endif /* CONFIG_PROC_FS */
1393
1394 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1395 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1396 MODULE_LICENSE("GPL");
1397 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1398
1399 module_init(ircomm_tty_init);
1400 module_exit(ircomm_tty_cleanup);