[PATCH] const struct tty_operations
[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(void *private_);
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 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", __FUNCTION__);
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                            __FUNCTION__);
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", __FUNCTION__ );
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", __FUNCTION__ ); 
167
168         ret = tty_unregister_driver(driver);
169         if (ret) {
170                 IRDA_ERROR("%s(), failed to unregister driver\n",
171                            __FUNCTION__);
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", __FUNCTION__ );
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", __FUNCTION__ );
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", __FUNCTION__);
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", __FUNCTION__ );
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", __FUNCTION__ );
264                 return 0;
265         }
266
267         if (tty->termios->c_cflag & CLOCAL) {
268                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __FUNCTION__ );
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", __FUNCTION__ );
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", __FUNCTION__);
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, self);
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", __FUNCTION__ , 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                                      __FUNCTION__);
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", __FUNCTION__ );
464         } else {
465                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __FUNCTION__ );
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", __FUNCTION__ ,
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", __FUNCTION__ );
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", __FUNCTION__ );
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", __FUNCTION__ , 
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                            __FUNCTION__, 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", __FUNCTION__ );
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         if (tty->driver->flush_buffer)
559                 tty->driver->flush_buffer(tty);
560         if (tty->ldisc.flush_buffer)
561                 tty->ldisc.flush_buffer(tty);
562
563         tty->closing = 0;
564         self->tty = NULL;
565
566         if (self->blocked_open) {
567                 if (self->close_delay)
568                         schedule_timeout_interruptible(self->close_delay);
569                 wake_up_interruptible(&self->open_wait);
570         }
571
572         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
573         wake_up_interruptible(&self->close_wait);
574 }
575
576 /*
577  * Function ircomm_tty_flush_buffer (tty)
578  *
579  *    
580  *
581  */
582 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
583 {
584         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
585
586         IRDA_ASSERT(self != NULL, return;);
587         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
588
589         /* 
590          * Let do_softint() do this to avoid race condition with 
591          * do_softint() ;-) 
592          */
593         schedule_work(&self->tqueue);
594 }
595
596 /*
597  * Function ircomm_tty_do_softint (private_)
598  *
599  *    We use this routine to give the write wakeup to the user at at a
600  *    safe time (as fast as possible after write have completed). This 
601  *    can be compared to the Tx interrupt.
602  */
603 static void ircomm_tty_do_softint(void *private_)
604 {
605         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) private_;
606         struct tty_struct *tty;
607         unsigned long flags;
608         struct sk_buff *skb, *ctrl_skb;
609
610         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
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         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && 
655             tty->ldisc.write_wakeup)
656         {
657                 (tty->ldisc.write_wakeup)(tty);
658         }
659         wake_up_interruptible(&tty->write_wait);
660 }
661
662 /*
663  * Function ircomm_tty_write (tty, buf, count)
664  *
665  *    This routine is called by the kernel to write a series of characters
666  *    to the tty device. The characters may come from user space or kernel
667  *    space. This routine will return the number of characters actually
668  *    accepted for writing. This routine is mandatory.
669  */
670 static int ircomm_tty_write(struct tty_struct *tty,
671                             const unsigned char *buf, int count)
672 {
673         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
674         unsigned long flags;
675         struct sk_buff *skb;
676         int tailroom = 0;
677         int len = 0;
678         int size;
679
680         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __FUNCTION__ , count,
681                    tty->hw_stopped);
682
683         IRDA_ASSERT(self != NULL, return -1;);
684         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
685
686         /* We may receive packets from the TTY even before we have finished
687          * our setup. Not cool.
688          * The problem is that we don't know the final header and data size
689          * to create the proper skb, so any skb we would create would have
690          * bogus header and data size, so need care.
691          * We use a bogus header size to safely detect this condition.
692          * Another problem is that hw_stopped was set to 0 way before it
693          * should be, so we would drop this skb. It should now be fixed.
694          * One option is to not accept data until we are properly setup.
695          * But, I suspect that when it happens, the ppp line discipline
696          * just "drops" the data, which might screw up connect scripts.
697          * The second option is to create a "safe skb", with large header
698          * and small size (see ircomm_tty_open() for values).
699          * We just need to make sure that when the real values get filled,
700          * we don't mess up the original "safe skb" (see tx_data_size).
701          * Jean II */
702         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
703                 IRDA_DEBUG(1, "%s() : not initialised\n", __FUNCTION__);
704 #ifdef IRCOMM_NO_TX_BEFORE_INIT
705                 /* We didn't consume anything, TTY will retry */
706                 return 0;
707 #endif
708         }
709
710         if (count < 1)
711                 return 0;
712
713         /* Protect our manipulation of self->tx_skb and related */
714         spin_lock_irqsave(&self->spinlock, flags);
715
716         /* Fetch current transmit buffer */
717         skb = self->tx_skb;
718
719         /*  
720          * Send out all the data we get, possibly as multiple fragmented
721          * frames, but this will only happen if the data is larger than the
722          * max data size. The normal case however is just the opposite, and
723          * this function may be called multiple times, and will then actually
724          * defragment the data and send it out as one packet as soon as 
725          * possible, but at a safer point in time
726          */
727         while (count) {
728                 size = count;
729
730                 /* Adjust data size to the max data size */
731                 if (size > self->max_data_size)
732                         size = self->max_data_size;
733                 
734                 /* 
735                  * Do we already have a buffer ready for transmit, or do
736                  * we need to allocate a new frame 
737                  */
738                 if (skb) {                      
739                         /* 
740                          * Any room for more data at the end of the current 
741                          * transmit buffer? Cannot use skb_tailroom, since
742                          * dev_alloc_skb gives us a larger skb than we 
743                          * requested
744                          * Note : use tx_data_size, because max_data_size
745                          * may have changed and we don't want to overwrite
746                          * the skb. - Jean II
747                          */
748                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
749                                 /* Adjust data to tailroom */
750                                 if (size > tailroom)
751                                         size = tailroom;
752                         } else {
753                                 /* 
754                                  * Current transmit frame is full, so break 
755                                  * out, so we can send it as soon as possible
756                                  */
757                                 break;
758                         }
759                 } else {
760                         /* Prepare a full sized frame */
761                         skb = alloc_skb(self->max_data_size+
762                                         self->max_header_size,
763                                         GFP_ATOMIC);
764                         if (!skb) {
765                                 spin_unlock_irqrestore(&self->spinlock, flags);
766                                 return -ENOBUFS;
767                         }
768                         skb_reserve(skb, self->max_header_size);
769                         self->tx_skb = skb;
770                         /* Remember skb size because max_data_size may
771                          * change later on - Jean II */
772                         self->tx_data_size = self->max_data_size;
773                 }
774
775                 /* Copy data */
776                 memcpy(skb_put(skb,size), buf + len, size);
777
778                 count -= size;
779                 len += size;
780         }
781
782         spin_unlock_irqrestore(&self->spinlock, flags);
783
784         /*     
785          * Schedule a new thread which will transmit the frame as soon
786          * as possible, but at a safe point in time. We do this so the
787          * "user" can give us data multiple times, as PPP does (because of
788          * its 256 byte tx buffer). We will then defragment and send out
789          * all this data as one single packet.  
790          */
791         schedule_work(&self->tqueue);
792         
793         return len;
794 }
795
796 /*
797  * Function ircomm_tty_write_room (tty)
798  *
799  *    This routine returns the numbers of characters the tty driver will
800  *    accept for queuing to be written. This number is subject to change as
801  *    output buffers get emptied, or if the output flow control is acted.
802  */
803 static int ircomm_tty_write_room(struct tty_struct *tty)
804 {
805         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
806         unsigned long flags;
807         int ret;
808
809         IRDA_ASSERT(self != NULL, return -1;);
810         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
811
812 #ifdef IRCOMM_NO_TX_BEFORE_INIT
813         /* max_header_size tells us if the channel is initialised or not. */
814         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
815                 /* Don't bother us yet */
816                 return 0;
817 #endif
818
819         /* Check if we are allowed to transmit any data.
820          * hw_stopped is the regular flow control.
821          * Jean II */
822         if (tty->hw_stopped)
823                 ret = 0;
824         else {
825                 spin_lock_irqsave(&self->spinlock, flags);
826                 if (self->tx_skb)
827                         ret = self->tx_data_size - self->tx_skb->len;
828                 else
829                         ret = self->max_data_size;
830                 spin_unlock_irqrestore(&self->spinlock, flags);
831         }
832         IRDA_DEBUG(2, "%s(), ret=%d\n", __FUNCTION__ , ret);
833
834         return ret;
835 }
836
837 /*
838  * Function ircomm_tty_wait_until_sent (tty, timeout)
839  *
840  *    This routine waits until the device has written out all of the
841  *    characters in its transmitter FIFO.
842  */
843 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
844 {
845         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
846         unsigned long orig_jiffies, poll_time;
847         unsigned long flags;
848         
849         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
850
851         IRDA_ASSERT(self != NULL, return;);
852         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
853
854         orig_jiffies = jiffies;
855
856         /* Set poll time to 200 ms */
857         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
858
859         spin_lock_irqsave(&self->spinlock, flags);
860         while (self->tx_skb && self->tx_skb->len) {
861                 spin_unlock_irqrestore(&self->spinlock, flags);
862                 schedule_timeout_interruptible(poll_time);
863                 spin_lock_irqsave(&self->spinlock, flags);
864                 if (signal_pending(current))
865                         break;
866                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
867                         break;
868         }
869         spin_unlock_irqrestore(&self->spinlock, flags);
870         current->state = TASK_RUNNING;
871 }
872
873 /*
874  * Function ircomm_tty_throttle (tty)
875  *
876  *    This routine notifies the tty driver that input buffers for the line
877  *    discipline are close to full, and it should somehow signal that no
878  *    more characters should be sent to the tty.  
879  */
880 static void ircomm_tty_throttle(struct tty_struct *tty)
881 {
882         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
883
884         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
885
886         IRDA_ASSERT(self != NULL, return;);
887         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
888
889         /* Software flow control? */
890         if (I_IXOFF(tty))
891                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
892         
893         /* Hardware flow control? */
894         if (tty->termios->c_cflag & CRTSCTS) {
895                 self->settings.dte &= ~IRCOMM_RTS;
896                 self->settings.dte |= IRCOMM_DELTA_RTS;
897         
898                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
899         }
900
901         ircomm_flow_request(self->ircomm, FLOW_STOP);
902 }
903
904 /*
905  * Function ircomm_tty_unthrottle (tty)
906  *
907  *    This routine notifies the tty drivers that it should signals that
908  *    characters can now be sent to the tty without fear of overrunning the
909  *    input buffers of the line disciplines.
910  */
911 static void ircomm_tty_unthrottle(struct tty_struct *tty)
912 {
913         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
914
915         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
916
917         IRDA_ASSERT(self != NULL, return;);
918         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
919
920         /* Using software flow control? */
921         if (I_IXOFF(tty)) {
922                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
923         }
924
925         /* Using hardware flow control? */
926         if (tty->termios->c_cflag & CRTSCTS) {
927                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
928
929                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
930                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __FUNCTION__ );
931         }
932         ircomm_flow_request(self->ircomm, FLOW_START);
933 }
934
935 /*
936  * Function ircomm_tty_chars_in_buffer (tty)
937  *
938  *    Indicates if there are any data in the buffer
939  *
940  */
941 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
942 {
943         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
944         unsigned long flags;
945         int len = 0;
946
947         IRDA_ASSERT(self != NULL, return -1;);
948         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
949
950         spin_lock_irqsave(&self->spinlock, flags);
951
952         if (self->tx_skb)
953                 len = self->tx_skb->len;
954
955         spin_unlock_irqrestore(&self->spinlock, flags);
956
957         return len;
958 }
959
960 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
961 {
962         unsigned long flags;
963
964         IRDA_ASSERT(self != NULL, return;);
965         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
966
967         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
968
969         if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
970                 return;
971
972         ircomm_tty_detach_cable(self);
973
974         spin_lock_irqsave(&self->spinlock, flags);
975
976         del_timer(&self->watchdog_timer);
977         
978         /* Free parameter buffer */
979         if (self->ctrl_skb) {
980                 dev_kfree_skb(self->ctrl_skb);
981                 self->ctrl_skb = NULL;
982         }
983
984         /* Free transmit buffer */
985         if (self->tx_skb) {
986                 dev_kfree_skb(self->tx_skb);
987                 self->tx_skb = NULL;
988         }
989
990         if (self->ircomm) {
991                 ircomm_close(self->ircomm);
992                 self->ircomm = NULL;
993         }
994
995         spin_unlock_irqrestore(&self->spinlock, flags);
996 }
997
998 /*
999  * Function ircomm_tty_hangup (tty)
1000  *
1001  *    This routine notifies the tty driver that it should hangup the tty
1002  *    device.
1003  * 
1004  */
1005 static void ircomm_tty_hangup(struct tty_struct *tty)
1006 {
1007         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1008         unsigned long   flags;
1009
1010         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
1011
1012         IRDA_ASSERT(self != NULL, return;);
1013         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1014
1015         if (!tty)
1016                 return;
1017
1018         /* ircomm_tty_flush_buffer(tty); */
1019         ircomm_tty_shutdown(self);
1020
1021         /* I guess we need to lock here - Jean II */
1022         spin_lock_irqsave(&self->spinlock, flags);
1023         self->flags &= ~ASYNC_NORMAL_ACTIVE;
1024         self->tty = NULL;
1025         self->open_count = 0;
1026         spin_unlock_irqrestore(&self->spinlock, flags);
1027
1028         wake_up_interruptible(&self->open_wait);
1029 }
1030
1031 /*
1032  * Function ircomm_tty_send_xchar (tty, ch)
1033  *
1034  *    This routine is used to send a high-priority XON/XOFF character to
1035  *    the device.
1036  */
1037 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1038 {
1039         IRDA_DEBUG(0, "%s(), not impl\n", __FUNCTION__ );
1040 }
1041
1042 /*
1043  * Function ircomm_tty_start (tty)
1044  *
1045  *    This routine notifies the tty driver that it resume sending
1046  *    characters to the tty device.  
1047  */
1048 void ircomm_tty_start(struct tty_struct *tty)
1049 {
1050         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1051
1052         ircomm_flow_request(self->ircomm, FLOW_START);
1053 }
1054
1055 /*
1056  * Function ircomm_tty_stop (tty)
1057  *
1058  *     This routine notifies the tty driver that it should stop outputting
1059  *     characters to the tty device. 
1060  */
1061 static void ircomm_tty_stop(struct tty_struct *tty) 
1062 {
1063         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1064
1065         IRDA_ASSERT(self != NULL, return;);
1066         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1067
1068         ircomm_flow_request(self->ircomm, FLOW_STOP);
1069 }
1070
1071 /*
1072  * Function ircomm_check_modem_status (self)
1073  *
1074  *    Check for any changes in the DCE's line settings. This function should
1075  *    be called whenever the dce parameter settings changes, to update the
1076  *    flow control settings and other things
1077  */
1078 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1079 {
1080         struct tty_struct *tty;
1081         int status;
1082
1083         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
1084
1085         IRDA_ASSERT(self != NULL, return;);
1086         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1087
1088         tty = self->tty;
1089
1090         status = self->settings.dce;
1091
1092         if (status & IRCOMM_DCE_DELTA_ANY) {
1093                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1094         }
1095         if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1096                 IRDA_DEBUG(2, 
1097                            "%s(), ircomm%d CD now %s...\n", __FUNCTION__ , self->line,
1098                            (status & IRCOMM_CD) ? "on" : "off");
1099
1100                 if (status & IRCOMM_CD) {
1101                         wake_up_interruptible(&self->open_wait);
1102                 } else {
1103                         IRDA_DEBUG(2, 
1104                                    "%s(), Doing serial hangup..\n", __FUNCTION__ );
1105                         if (tty)
1106                                 tty_hangup(tty);
1107
1108                         /* Hangup will remote the tty, so better break out */
1109                         return;
1110                 }
1111         }
1112         if (self->flags & ASYNC_CTS_FLOW) {
1113                 if (tty->hw_stopped) {
1114                         if (status & IRCOMM_CTS) {
1115                                 IRDA_DEBUG(2, 
1116                                            "%s(), CTS tx start...\n", __FUNCTION__ );
1117                                 tty->hw_stopped = 0;
1118                                 
1119                                 /* Wake up processes blocked on open */
1120                                 wake_up_interruptible(&self->open_wait);
1121
1122                                 schedule_work(&self->tqueue);
1123                                 return;
1124                         }
1125                 } else {
1126                         if (!(status & IRCOMM_CTS)) {
1127                                 IRDA_DEBUG(2, 
1128                                            "%s(), CTS tx stop...\n", __FUNCTION__ );
1129                                 tty->hw_stopped = 1;
1130                         }
1131                 }
1132         }
1133 }
1134
1135 /*
1136  * Function ircomm_tty_data_indication (instance, sap, skb)
1137  *
1138  *    Handle incoming data, and deliver it to the line discipline
1139  *
1140  */
1141 static int ircomm_tty_data_indication(void *instance, void *sap,
1142                                       struct sk_buff *skb)
1143 {
1144         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1145
1146         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
1147         
1148         IRDA_ASSERT(self != NULL, return -1;);
1149         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1150         IRDA_ASSERT(skb != NULL, return -1;);
1151
1152         if (!self->tty) {
1153                 IRDA_DEBUG(0, "%s(), no tty!\n", __FUNCTION__ );
1154                 return 0;
1155         }
1156
1157         /* 
1158          * If we receive data when hardware is stopped then something is wrong.
1159          * We try to poll the peers line settings to check if we are up todate.
1160          * Devices like WinCE can do this, and since they don't send any 
1161          * params, we can just as well declare the hardware for running.
1162          */
1163         if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1164                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __FUNCTION__ );
1165                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1166
1167                 /* We can just as well declare the hardware for running */
1168                 ircomm_tty_send_initial_parameters(self);
1169                 ircomm_tty_link_established(self);
1170         }
1171
1172         /* 
1173          * Just give it over to the line discipline. There is no need to
1174          * involve the flip buffers, since we are not running in an interrupt 
1175          * handler
1176          */
1177         self->tty->ldisc.receive_buf(self->tty, skb->data, NULL, skb->len);
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", __FUNCTION__ );
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", __FUNCTION__ );
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", __FUNCTION__ );
1241                 tty->hw_stopped = 1;
1242                 break;
1243         }
1244         self->flow = cmd;
1245 }
1246
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 #ifdef CONFIG_PROC_FS
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);