tty: The big operations rework
[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/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 < 0) || (line >= IRCOMM_TTY_PORTS)) {
375                 return -ENODEV;
376         }
377
378         /* Check if instance already exists */
379         self = hashbin_lock_find(ircomm_tty, line, NULL);
380         if (!self) {
381                 /* No, so make new instance */
382                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
383                 if (self == NULL) {
384                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
385                         return -ENOMEM;
386                 }
387
388                 self->magic = IRCOMM_TTY_MAGIC;
389                 self->flow = FLOW_STOP;
390
391                 self->line = line;
392                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
393                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
394                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
395                 self->close_delay = 5*HZ/10;
396                 self->closing_wait = 30*HZ;
397
398                 /* Init some important stuff */
399                 init_timer(&self->watchdog_timer);
400                 init_waitqueue_head(&self->open_wait);
401                 init_waitqueue_head(&self->close_wait);
402                 spin_lock_init(&self->spinlock);
403
404                 /*
405                  * Force TTY into raw mode by default which is usually what
406                  * we want for IrCOMM and IrLPT. This way applications will
407                  * not have to twiddle with printcap etc.
408                  */
409                 tty->termios->c_iflag = 0;
410                 tty->termios->c_oflag = 0;
411
412                 /* Insert into hash */
413                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
414         }
415         /* ++ is not atomic, so this should be protected - Jean II */
416         spin_lock_irqsave(&self->spinlock, flags);
417         self->open_count++;
418
419         tty->driver_data = self;
420         self->tty = tty;
421         spin_unlock_irqrestore(&self->spinlock, flags);
422
423         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
424                    self->line, self->open_count);
425
426         /* Not really used by us, but lets do it anyway */
427         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
428
429         /*
430          * If the port is the middle of closing, bail out now
431          */
432         if (tty_hung_up_p(filp) ||
433             test_bit(ASYNC_B_CLOSING, &self->flags)) {
434
435                 /* Hm, why are we blocking on ASYNC_CLOSING if we
436                  * do return -EAGAIN/-ERESTARTSYS below anyway?
437                  * IMHO it's either not needed in the first place
438                  * or for some reason we need to make sure the async
439                  * closing has been finished - if so, wouldn't we
440                  * probably better sleep uninterruptible?
441                  */
442
443                 if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) {
444                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
445                                      __func__);
446                         return -ERESTARTSYS;
447                 }
448
449 #ifdef SERIAL_DO_RESTART
450                 return ((self->flags & ASYNC_HUP_NOTIFY) ?
451                         -EAGAIN : -ERESTARTSYS);
452 #else
453                 return -EAGAIN;
454 #endif
455         }
456
457         /* Check if this is a "normal" ircomm device, or an irlpt device */
458         if (line < 0x10) {
459                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
460                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
461                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
462                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
463                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
464         } else {
465                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
466                 self->service_type = IRCOMM_3_WIRE_RAW;
467                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
468         }
469
470         ret = ircomm_tty_startup(self);
471         if (ret)
472                 return ret;
473
474         ret = ircomm_tty_block_til_ready(self, filp);
475         if (ret) {
476                 IRDA_DEBUG(2,
477                       "%s(), returning after block_til_ready with %d\n", __func__ ,
478                       ret);
479
480                 return ret;
481         }
482         return 0;
483 }
484
485 /*
486  * Function ircomm_tty_close (tty, filp)
487  *
488  *    This routine is called when a particular tty device is closed.
489  *
490  */
491 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
492 {
493         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
494         unsigned long flags;
495
496         IRDA_DEBUG(0, "%s()\n", __func__ );
497
498         if (!tty)
499                 return;
500
501         IRDA_ASSERT(self != NULL, return;);
502         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
503
504         spin_lock_irqsave(&self->spinlock, flags);
505
506         if (tty_hung_up_p(filp)) {
507                 spin_unlock_irqrestore(&self->spinlock, flags);
508
509                 IRDA_DEBUG(0, "%s(), returning 1\n", __func__ );
510                 return;
511         }
512
513         if ((tty->count == 1) && (self->open_count != 1)) {
514                 /*
515                  * Uh, oh.  tty->count is 1, which means that the tty
516                  * structure will be freed.  state->count should always
517                  * be one in these conditions.  If it's greater than
518                  * one, we've got real problems, since it means the
519                  * serial port won't be shutdown.
520                  */
521                 IRDA_DEBUG(0, "%s(), bad serial port count; "
522                            "tty->count is 1, state->count is %d\n", __func__ ,
523                            self->open_count);
524                 self->open_count = 1;
525         }
526
527         if (--self->open_count < 0) {
528                 IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n",
529                            __func__, self->line, self->open_count);
530                 self->open_count = 0;
531         }
532         if (self->open_count) {
533                 spin_unlock_irqrestore(&self->spinlock, flags);
534
535                 IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ );
536                 return;
537         }
538
539         /* Hum... Should be test_and_set_bit ??? - Jean II */
540         set_bit(ASYNC_B_CLOSING, &self->flags);
541
542         /* We need to unlock here (we were unlocking at the end of this
543          * function), because tty_wait_until_sent() may schedule.
544          * I don't know if the rest should be protected somehow,
545          * so someone should check. - Jean II */
546         spin_unlock_irqrestore(&self->spinlock, flags);
547
548         /*
549          * Now we wait for the transmit buffer to clear; and we notify
550          * the line discipline to only process XON/XOFF characters.
551          */
552         tty->closing = 1;
553         if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
554                 tty_wait_until_sent(tty, self->closing_wait);
555
556         ircomm_tty_shutdown(self);
557
558         tty_driver_flush_buffer(tty);
559         tty_ldisc_flush(tty);
560
561         tty->closing = 0;
562         self->tty = NULL;
563
564         if (self->blocked_open) {
565                 if (self->close_delay)
566                         schedule_timeout_interruptible(self->close_delay);
567                 wake_up_interruptible(&self->open_wait);
568         }
569
570         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
571         wake_up_interruptible(&self->close_wait);
572 }
573
574 /*
575  * Function ircomm_tty_flush_buffer (tty)
576  *
577  *
578  *
579  */
580 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
581 {
582         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
583
584         IRDA_ASSERT(self != NULL, return;);
585         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
586
587         /*
588          * Let do_softint() do this to avoid race condition with
589          * do_softint() ;-)
590          */
591         schedule_work(&self->tqueue);
592 }
593
594 /*
595  * Function ircomm_tty_do_softint (work)
596  *
597  *    We use this routine to give the write wakeup to the user at at a
598  *    safe time (as fast as possible after write have completed). This
599  *    can be compared to the Tx interrupt.
600  */
601 static void ircomm_tty_do_softint(struct work_struct *work)
602 {
603         struct ircomm_tty_cb *self =
604                 container_of(work, struct ircomm_tty_cb, tqueue);
605         struct tty_struct *tty;
606         unsigned long flags;
607         struct sk_buff *skb, *ctrl_skb;
608
609         IRDA_DEBUG(2, "%s()\n", __func__ );
610
611         if (!self || self->magic != IRCOMM_TTY_MAGIC)
612                 return;
613
614         tty = self->tty;
615         if (!tty)
616                 return;
617
618         /* Unlink control buffer */
619         spin_lock_irqsave(&self->spinlock, flags);
620
621         ctrl_skb = self->ctrl_skb;
622         self->ctrl_skb = NULL;
623
624         spin_unlock_irqrestore(&self->spinlock, flags);
625
626         /* Flush control buffer if any */
627         if(ctrl_skb) {
628                 if(self->flow == FLOW_START)
629                         ircomm_control_request(self->ircomm, ctrl_skb);
630                 /* Drop reference count - see ircomm_ttp_data_request(). */
631                 dev_kfree_skb(ctrl_skb);
632         }
633
634         if (tty->hw_stopped)
635                 return;
636
637         /* Unlink transmit buffer */
638         spin_lock_irqsave(&self->spinlock, flags);
639
640         skb = self->tx_skb;
641         self->tx_skb = NULL;
642
643         spin_unlock_irqrestore(&self->spinlock, flags);
644
645         /* Flush transmit buffer if any */
646         if (skb) {
647                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
648                 /* Drop reference count - see ircomm_ttp_data_request(). */
649                 dev_kfree_skb(skb);
650         }
651
652         /* Check if user (still) wants to be waken up */
653         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
654             tty->ldisc.write_wakeup)
655         {
656                 (tty->ldisc.write_wakeup)(tty);
657         }
658         wake_up_interruptible(&tty->write_wait);
659 }
660
661 /*
662  * Function ircomm_tty_write (tty, buf, count)
663  *
664  *    This routine is called by the kernel to write a series of characters
665  *    to the tty device. The characters may come from user space or kernel
666  *    space. This routine will return the number of characters actually
667  *    accepted for writing. This routine is mandatory.
668  */
669 static int ircomm_tty_write(struct tty_struct *tty,
670                             const unsigned char *buf, int count)
671 {
672         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
673         unsigned long flags;
674         struct sk_buff *skb;
675         int tailroom = 0;
676         int len = 0;
677         int size;
678
679         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
680                    tty->hw_stopped);
681
682         IRDA_ASSERT(self != NULL, return -1;);
683         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
684
685         /* We may receive packets from the TTY even before we have finished
686          * our setup. Not cool.
687          * The problem is that we don't know the final header and data size
688          * to create the proper skb, so any skb we would create would have
689          * bogus header and data size, so need care.
690          * We use a bogus header size to safely detect this condition.
691          * Another problem is that hw_stopped was set to 0 way before it
692          * should be, so we would drop this skb. It should now be fixed.
693          * One option is to not accept data until we are properly setup.
694          * But, I suspect that when it happens, the ppp line discipline
695          * just "drops" the data, which might screw up connect scripts.
696          * The second option is to create a "safe skb", with large header
697          * and small size (see ircomm_tty_open() for values).
698          * We just need to make sure that when the real values get filled,
699          * we don't mess up the original "safe skb" (see tx_data_size).
700          * Jean II */
701         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
702                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
703 #ifdef IRCOMM_NO_TX_BEFORE_INIT
704                 /* We didn't consume anything, TTY will retry */
705                 return 0;
706 #endif
707         }
708
709         if (count < 1)
710                 return 0;
711
712         /* Protect our manipulation of self->tx_skb and related */
713         spin_lock_irqsave(&self->spinlock, flags);
714
715         /* Fetch current transmit buffer */
716         skb = self->tx_skb;
717
718         /*
719          * Send out all the data we get, possibly as multiple fragmented
720          * frames, but this will only happen if the data is larger than the
721          * max data size. The normal case however is just the opposite, and
722          * this function may be called multiple times, and will then actually
723          * defragment the data and send it out as one packet as soon as
724          * possible, but at a safer point in time
725          */
726         while (count) {
727                 size = count;
728
729                 /* Adjust data size to the max data size */
730                 if (size > self->max_data_size)
731                         size = self->max_data_size;
732
733                 /*
734                  * Do we already have a buffer ready for transmit, or do
735                  * we need to allocate a new frame
736                  */
737                 if (skb) {
738                         /*
739                          * Any room for more data at the end of the current
740                          * transmit buffer? Cannot use skb_tailroom, since
741                          * dev_alloc_skb gives us a larger skb than we
742                          * requested
743                          * Note : use tx_data_size, because max_data_size
744                          * may have changed and we don't want to overwrite
745                          * the skb. - Jean II
746                          */
747                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
748                                 /* Adjust data to tailroom */
749                                 if (size > tailroom)
750                                         size = tailroom;
751                         } else {
752                                 /*
753                                  * Current transmit frame is full, so break
754                                  * out, so we can send it as soon as possible
755                                  */
756                                 break;
757                         }
758                 } else {
759                         /* Prepare a full sized frame */
760                         skb = alloc_skb(self->max_data_size+
761                                         self->max_header_size,
762                                         GFP_ATOMIC);
763                         if (!skb) {
764                                 spin_unlock_irqrestore(&self->spinlock, flags);
765                                 return -ENOBUFS;
766                         }
767                         skb_reserve(skb, self->max_header_size);
768                         self->tx_skb = skb;
769                         /* Remember skb size because max_data_size may
770                          * change later on - Jean II */
771                         self->tx_data_size = self->max_data_size;
772                 }
773
774                 /* Copy data */
775                 memcpy(skb_put(skb,size), buf + len, size);
776
777                 count -= size;
778                 len += size;
779         }
780
781         spin_unlock_irqrestore(&self->spinlock, flags);
782
783         /*
784          * Schedule a new thread which will transmit the frame as soon
785          * as possible, but at a safe point in time. We do this so the
786          * "user" can give us data multiple times, as PPP does (because of
787          * its 256 byte tx buffer). We will then defragment and send out
788          * all this data as one single packet.
789          */
790         schedule_work(&self->tqueue);
791
792         return len;
793 }
794
795 /*
796  * Function ircomm_tty_write_room (tty)
797  *
798  *    This routine returns the numbers of characters the tty driver will
799  *    accept for queuing to be written. This number is subject to change as
800  *    output buffers get emptied, or if the output flow control is acted.
801  */
802 static int ircomm_tty_write_room(struct tty_struct *tty)
803 {
804         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
805         unsigned long flags;
806         int ret;
807
808         IRDA_ASSERT(self != NULL, return -1;);
809         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
810
811 #ifdef IRCOMM_NO_TX_BEFORE_INIT
812         /* max_header_size tells us if the channel is initialised or not. */
813         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
814                 /* Don't bother us yet */
815                 return 0;
816 #endif
817
818         /* Check if we are allowed to transmit any data.
819          * hw_stopped is the regular flow control.
820          * Jean II */
821         if (tty->hw_stopped)
822                 ret = 0;
823         else {
824                 spin_lock_irqsave(&self->spinlock, flags);
825                 if (self->tx_skb)
826                         ret = self->tx_data_size - self->tx_skb->len;
827                 else
828                         ret = self->max_data_size;
829                 spin_unlock_irqrestore(&self->spinlock, flags);
830         }
831         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
832
833         return ret;
834 }
835
836 /*
837  * Function ircomm_tty_wait_until_sent (tty, timeout)
838  *
839  *    This routine waits until the device has written out all of the
840  *    characters in its transmitter FIFO.
841  */
842 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
843 {
844         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
845         unsigned long orig_jiffies, poll_time;
846         unsigned long flags;
847
848         IRDA_DEBUG(2, "%s()\n", __func__ );
849
850         IRDA_ASSERT(self != NULL, return;);
851         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
852
853         orig_jiffies = jiffies;
854
855         /* Set poll time to 200 ms */
856         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
857
858         spin_lock_irqsave(&self->spinlock, flags);
859         while (self->tx_skb && self->tx_skb->len) {
860                 spin_unlock_irqrestore(&self->spinlock, flags);
861                 schedule_timeout_interruptible(poll_time);
862                 spin_lock_irqsave(&self->spinlock, flags);
863                 if (signal_pending(current))
864                         break;
865                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
866                         break;
867         }
868         spin_unlock_irqrestore(&self->spinlock, flags);
869         current->state = TASK_RUNNING;
870 }
871
872 /*
873  * Function ircomm_tty_throttle (tty)
874  *
875  *    This routine notifies the tty driver that input buffers for the line
876  *    discipline are close to full, and it should somehow signal that no
877  *    more characters should be sent to the tty.
878  */
879 static void ircomm_tty_throttle(struct tty_struct *tty)
880 {
881         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
882
883         IRDA_DEBUG(2, "%s()\n", __func__ );
884
885         IRDA_ASSERT(self != NULL, return;);
886         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
887
888         /* Software flow control? */
889         if (I_IXOFF(tty))
890                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
891
892         /* Hardware flow control? */
893         if (tty->termios->c_cflag & CRTSCTS) {
894                 self->settings.dte &= ~IRCOMM_RTS;
895                 self->settings.dte |= IRCOMM_DELTA_RTS;
896
897                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
898         }
899
900         ircomm_flow_request(self->ircomm, FLOW_STOP);
901 }
902
903 /*
904  * Function ircomm_tty_unthrottle (tty)
905  *
906  *    This routine notifies the tty drivers that it should signals that
907  *    characters can now be sent to the tty without fear of overrunning the
908  *    input buffers of the line disciplines.
909  */
910 static void ircomm_tty_unthrottle(struct tty_struct *tty)
911 {
912         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
913
914         IRDA_DEBUG(2, "%s()\n", __func__ );
915
916         IRDA_ASSERT(self != NULL, return;);
917         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
918
919         /* Using software flow control? */
920         if (I_IXOFF(tty)) {
921                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
922         }
923
924         /* Using hardware flow control? */
925         if (tty->termios->c_cflag & CRTSCTS) {
926                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
927
928                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
929                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
930         }
931         ircomm_flow_request(self->ircomm, FLOW_START);
932 }
933
934 /*
935  * Function ircomm_tty_chars_in_buffer (tty)
936  *
937  *    Indicates if there are any data in the buffer
938  *
939  */
940 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
941 {
942         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
943         unsigned long flags;
944         int len = 0;
945
946         IRDA_ASSERT(self != NULL, return -1;);
947         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
948
949         spin_lock_irqsave(&self->spinlock, flags);
950
951         if (self->tx_skb)
952                 len = self->tx_skb->len;
953
954         spin_unlock_irqrestore(&self->spinlock, flags);
955
956         return len;
957 }
958
959 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
960 {
961         unsigned long flags;
962
963         IRDA_ASSERT(self != NULL, return;);
964         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
965
966         IRDA_DEBUG(0, "%s()\n", __func__ );
967
968         if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
969                 return;
970
971         ircomm_tty_detach_cable(self);
972
973         spin_lock_irqsave(&self->spinlock, flags);
974
975         del_timer(&self->watchdog_timer);
976
977         /* Free parameter buffer */
978         if (self->ctrl_skb) {
979                 dev_kfree_skb(self->ctrl_skb);
980                 self->ctrl_skb = NULL;
981         }
982
983         /* Free transmit buffer */
984         if (self->tx_skb) {
985                 dev_kfree_skb(self->tx_skb);
986                 self->tx_skb = NULL;
987         }
988
989         if (self->ircomm) {
990                 ircomm_close(self->ircomm);
991                 self->ircomm = NULL;
992         }
993
994         spin_unlock_irqrestore(&self->spinlock, flags);
995 }
996
997 /*
998  * Function ircomm_tty_hangup (tty)
999  *
1000  *    This routine notifies the tty driver that it should hangup the tty
1001  *    device.
1002  *
1003  */
1004 static void ircomm_tty_hangup(struct tty_struct *tty)
1005 {
1006         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1007         unsigned long   flags;
1008
1009         IRDA_DEBUG(0, "%s()\n", __func__ );
1010
1011         IRDA_ASSERT(self != NULL, return;);
1012         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1013
1014         if (!tty)
1015                 return;
1016
1017         /* ircomm_tty_flush_buffer(tty); */
1018         ircomm_tty_shutdown(self);
1019
1020         /* I guess we need to lock here - Jean II */
1021         spin_lock_irqsave(&self->spinlock, flags);
1022         self->flags &= ~ASYNC_NORMAL_ACTIVE;
1023         self->tty = NULL;
1024         self->open_count = 0;
1025         spin_unlock_irqrestore(&self->spinlock, flags);
1026
1027         wake_up_interruptible(&self->open_wait);
1028 }
1029
1030 /*
1031  * Function ircomm_tty_send_xchar (tty, ch)
1032  *
1033  *    This routine is used to send a high-priority XON/XOFF character to
1034  *    the device.
1035  */
1036 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1037 {
1038         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1039 }
1040
1041 /*
1042  * Function ircomm_tty_start (tty)
1043  *
1044  *    This routine notifies the tty driver that it resume sending
1045  *    characters to the tty device.
1046  */
1047 void ircomm_tty_start(struct tty_struct *tty)
1048 {
1049         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1050
1051         ircomm_flow_request(self->ircomm, FLOW_START);
1052 }
1053
1054 /*
1055  * Function ircomm_tty_stop (tty)
1056  *
1057  *     This routine notifies the tty driver that it should stop outputting
1058  *     characters to the tty device.
1059  */
1060 static void ircomm_tty_stop(struct tty_struct *tty)
1061 {
1062         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1063
1064         IRDA_ASSERT(self != NULL, return;);
1065         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1066
1067         ircomm_flow_request(self->ircomm, FLOW_STOP);
1068 }
1069
1070 /*
1071  * Function ircomm_check_modem_status (self)
1072  *
1073  *    Check for any changes in the DCE's line settings. This function should
1074  *    be called whenever the dce parameter settings changes, to update the
1075  *    flow control settings and other things
1076  */
1077 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1078 {
1079         struct tty_struct *tty;
1080         int status;
1081
1082         IRDA_DEBUG(0, "%s()\n", __func__ );
1083
1084         IRDA_ASSERT(self != NULL, return;);
1085         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1086
1087         tty = self->tty;
1088
1089         status = self->settings.dce;
1090
1091         if (status & IRCOMM_DCE_DELTA_ANY) {
1092                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1093         }
1094         if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1095                 IRDA_DEBUG(2,
1096                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1097                            (status & IRCOMM_CD) ? "on" : "off");
1098
1099                 if (status & IRCOMM_CD) {
1100                         wake_up_interruptible(&self->open_wait);
1101                 } else {
1102                         IRDA_DEBUG(2,
1103                                    "%s(), Doing serial hangup..\n", __func__ );
1104                         if (tty)
1105                                 tty_hangup(tty);
1106
1107                         /* Hangup will remote the tty, so better break out */
1108                         return;
1109                 }
1110         }
1111         if (self->flags & ASYNC_CTS_FLOW) {
1112                 if (tty->hw_stopped) {
1113                         if (status & IRCOMM_CTS) {
1114                                 IRDA_DEBUG(2,
1115                                            "%s(), CTS tx start...\n", __func__ );
1116                                 tty->hw_stopped = 0;
1117
1118                                 /* Wake up processes blocked on open */
1119                                 wake_up_interruptible(&self->open_wait);
1120
1121                                 schedule_work(&self->tqueue);
1122                                 return;
1123                         }
1124                 } else {
1125                         if (!(status & IRCOMM_CTS)) {
1126                                 IRDA_DEBUG(2,
1127                                            "%s(), CTS tx stop...\n", __func__ );
1128                                 tty->hw_stopped = 1;
1129                         }
1130                 }
1131         }
1132 }
1133
1134 /*
1135  * Function ircomm_tty_data_indication (instance, sap, skb)
1136  *
1137  *    Handle incoming data, and deliver it to the line discipline
1138  *
1139  */
1140 static int ircomm_tty_data_indication(void *instance, void *sap,
1141                                       struct sk_buff *skb)
1142 {
1143         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1144
1145         IRDA_DEBUG(2, "%s()\n", __func__ );
1146
1147         IRDA_ASSERT(self != NULL, return -1;);
1148         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1149         IRDA_ASSERT(skb != NULL, return -1;);
1150
1151         if (!self->tty) {
1152                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1153                 return 0;
1154         }
1155
1156         /*
1157          * If we receive data when hardware is stopped then something is wrong.
1158          * We try to poll the peers line settings to check if we are up todate.
1159          * Devices like WinCE can do this, and since they don't send any
1160          * params, we can just as well declare the hardware for running.
1161          */
1162         if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1163                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1164                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1165
1166                 /* We can just as well declare the hardware for running */
1167                 ircomm_tty_send_initial_parameters(self);
1168                 ircomm_tty_link_established(self);
1169         }
1170
1171         /*
1172          * Just give it over to the line discipline. There is no need to
1173          * involve the flip buffers, since we are not running in an interrupt
1174          * handler
1175          */
1176         self->tty->ldisc.receive_buf(self->tty, skb->data, NULL, skb->len);
1177
1178         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1179
1180         return 0;
1181 }
1182
1183 /*
1184  * Function ircomm_tty_control_indication (instance, sap, skb)
1185  *
1186  *    Parse all incoming parameters (easy!)
1187  *
1188  */
1189 static int ircomm_tty_control_indication(void *instance, void *sap,
1190                                          struct sk_buff *skb)
1191 {
1192         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1193         int clen;
1194
1195         IRDA_DEBUG(4, "%s()\n", __func__ );
1196
1197         IRDA_ASSERT(self != NULL, return -1;);
1198         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1199         IRDA_ASSERT(skb != NULL, return -1;);
1200
1201         clen = skb->data[0];
1202
1203         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1204                                &ircomm_param_info);
1205
1206         /* No need to kfree_skb - see ircomm_control_indication() */
1207
1208         return 0;
1209 }
1210
1211 /*
1212  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1213  *
1214  *    This function is called by IrTTP when it wants us to slow down the
1215  *    transmission of data. We just mark the hardware as stopped, and wait
1216  *    for IrTTP to notify us that things are OK again.
1217  */
1218 static void ircomm_tty_flow_indication(void *instance, void *sap,
1219                                        LOCAL_FLOW cmd)
1220 {
1221         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1222         struct tty_struct *tty;
1223
1224         IRDA_ASSERT(self != NULL, return;);
1225         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1226
1227         tty = self->tty;
1228
1229         switch (cmd) {
1230         case FLOW_START:
1231                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1232                 tty->hw_stopped = 0;
1233
1234                 /* ircomm_tty_do_softint will take care of the rest */
1235                 schedule_work(&self->tqueue);
1236                 break;
1237         default:  /* If we get here, something is very wrong, better stop */
1238         case FLOW_STOP:
1239                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1240                 tty->hw_stopped = 1;
1241                 break;
1242         }
1243         self->flow = cmd;
1244 }
1245
1246 #ifdef CONFIG_PROC_FS
1247 static int ircomm_tty_line_info(struct ircomm_tty_cb *self, char *buf)
1248 {
1249         int  ret=0;
1250
1251         ret += sprintf(buf+ret, "State: %s\n", ircomm_tty_state[self->state]);
1252
1253         ret += sprintf(buf+ret, "Service type: ");
1254         if (self->service_type & IRCOMM_9_WIRE)
1255                 ret += sprintf(buf+ret, "9_WIRE");
1256         else if (self->service_type & IRCOMM_3_WIRE)
1257                 ret += sprintf(buf+ret, "3_WIRE");
1258         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1259                 ret += sprintf(buf+ret, "3_WIRE_RAW");
1260         else
1261                 ret += sprintf(buf+ret, "No common service type!\n");
1262         ret += sprintf(buf+ret, "\n");
1263
1264         ret += sprintf(buf+ret, "Port name: %s\n", self->settings.port_name);
1265
1266         ret += sprintf(buf+ret, "DTE status: ");
1267         if (self->settings.dte & IRCOMM_RTS)
1268                 ret += sprintf(buf+ret, "RTS|");
1269         if (self->settings.dte & IRCOMM_DTR)
1270                 ret += sprintf(buf+ret, "DTR|");
1271         if (self->settings.dte)
1272                 ret--; /* remove the last | */
1273         ret += sprintf(buf+ret, "\n");
1274
1275         ret += sprintf(buf+ret, "DCE status: ");
1276         if (self->settings.dce & IRCOMM_CTS)
1277                 ret += sprintf(buf+ret, "CTS|");
1278         if (self->settings.dce & IRCOMM_DSR)
1279                 ret += sprintf(buf+ret, "DSR|");
1280         if (self->settings.dce & IRCOMM_CD)
1281                 ret += sprintf(buf+ret, "CD|");
1282         if (self->settings.dce & IRCOMM_RI)
1283                 ret += sprintf(buf+ret, "RI|");
1284         if (self->settings.dce)
1285                 ret--; /* remove the last | */
1286         ret += sprintf(buf+ret, "\n");
1287
1288         ret += sprintf(buf+ret, "Configuration: ");
1289         if (!self->settings.null_modem)
1290                 ret += sprintf(buf+ret, "DTE <-> DCE\n");
1291         else
1292                 ret += sprintf(buf+ret,
1293                                "DTE <-> DTE (null modem emulation)\n");
1294
1295         ret += sprintf(buf+ret, "Data rate: %d\n", self->settings.data_rate);
1296
1297         ret += sprintf(buf+ret, "Flow control: ");
1298         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN)
1299                 ret += sprintf(buf+ret, "XON_XOFF_IN|");
1300         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT)
1301                 ret += sprintf(buf+ret, "XON_XOFF_OUT|");
1302         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN)
1303                 ret += sprintf(buf+ret, "RTS_CTS_IN|");
1304         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT)
1305                 ret += sprintf(buf+ret, "RTS_CTS_OUT|");
1306         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN)
1307                 ret += sprintf(buf+ret, "DSR_DTR_IN|");
1308         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT)
1309                 ret += sprintf(buf+ret, "DSR_DTR_OUT|");
1310         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN)
1311                 ret += sprintf(buf+ret, "ENQ_ACK_IN|");
1312         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT)
1313                 ret += sprintf(buf+ret, "ENQ_ACK_OUT|");
1314         if (self->settings.flow_control)
1315                 ret--; /* remove the last | */
1316         ret += sprintf(buf+ret, "\n");
1317
1318         ret += sprintf(buf+ret, "Flags: ");
1319         if (self->flags & ASYNC_CTS_FLOW)
1320                 ret += sprintf(buf+ret, "ASYNC_CTS_FLOW|");
1321         if (self->flags & ASYNC_CHECK_CD)
1322                 ret += sprintf(buf+ret, "ASYNC_CHECK_CD|");
1323         if (self->flags & ASYNC_INITIALIZED)
1324                 ret += sprintf(buf+ret, "ASYNC_INITIALIZED|");
1325         if (self->flags & ASYNC_LOW_LATENCY)
1326                 ret += sprintf(buf+ret, "ASYNC_LOW_LATENCY|");
1327         if (self->flags & ASYNC_CLOSING)
1328                 ret += sprintf(buf+ret, "ASYNC_CLOSING|");
1329         if (self->flags & ASYNC_NORMAL_ACTIVE)
1330                 ret += sprintf(buf+ret, "ASYNC_NORMAL_ACTIVE|");
1331         if (self->flags)
1332                 ret--; /* remove the last | */
1333         ret += sprintf(buf+ret, "\n");
1334
1335         ret += sprintf(buf+ret, "Role: %s\n", self->client ?
1336                        "client" : "server");
1337         ret += sprintf(buf+ret, "Open count: %d\n", self->open_count);
1338         ret += sprintf(buf+ret, "Max data size: %d\n", self->max_data_size);
1339         ret += sprintf(buf+ret, "Max header size: %d\n", self->max_header_size);
1340
1341         if (self->tty)
1342                 ret += sprintf(buf+ret, "Hardware: %s\n",
1343                                self->tty->hw_stopped ? "Stopped" : "Running");
1344
1345         ret += sprintf(buf+ret, "\n");
1346         return ret;
1347 }
1348
1349
1350 /*
1351  * Function ircomm_tty_read_proc (buf, start, offset, len, eof, unused)
1352  *
1353  *
1354  *
1355  */
1356 static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
1357                                 int *eof, void *unused)
1358 {
1359         struct ircomm_tty_cb *self;
1360         int count = 0, l;
1361         off_t begin = 0;
1362         unsigned long flags;
1363
1364         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1365
1366         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1367         while ((self != NULL) && (count < 4000)) {
1368                 if (self->magic != IRCOMM_TTY_MAGIC)
1369                         break;
1370
1371                 l = ircomm_tty_line_info(self, buf + count);
1372                 count += l;
1373                 if (count+begin > offset+len)
1374                         goto done;
1375                 if (count+begin < offset) {
1376                         begin += count;
1377                         count = 0;
1378                 }
1379
1380                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1381         }
1382         *eof = 1;
1383 done:
1384         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1385
1386         if (offset >= count+begin)
1387                 return 0;
1388         *start = buf + (offset-begin);
1389         return ((len < begin+count-offset) ? len : begin+count-offset);
1390 }
1391 #endif /* CONFIG_PROC_FS */
1392
1393 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1394 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1395 MODULE_LICENSE("GPL");
1396 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1397
1398 module_init(ircomm_tty_init);
1399 module_exit(ircomm_tty_cleanup);