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[NET]: fix-up schedule_timeout() usage
[deliverable/linux.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/config.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/fs.h>
37 #include <linux/sched.h>
38 #include <linux/termios.h>
39 #include <linux/tty.h>
40 #include <linux/interrupt.h>
41 #include <linux/device.h> /* for MODULE_ALIAS_CHARDEV_MAJOR */
42
43 #include <asm/uaccess.h>
44
45 #include <net/irda/irda.h>
46 #include <net/irda/irmod.h>
47
48 #include <net/irda/ircomm_core.h>
49 #include <net/irda/ircomm_param.h>
50 #include <net/irda/ircomm_tty_attach.h>
51 #include <net/irda/ircomm_tty.h>
52
53 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp);
54 static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
55 static int ircomm_tty_write(struct tty_struct * tty,
56 const unsigned char *buf, int count);
57 static int ircomm_tty_write_room(struct tty_struct *tty);
58 static void ircomm_tty_throttle(struct tty_struct *tty);
59 static void ircomm_tty_unthrottle(struct tty_struct *tty);
60 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty);
61 static void ircomm_tty_flush_buffer(struct tty_struct *tty);
62 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
63 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
64 static void ircomm_tty_hangup(struct tty_struct *tty);
65 static void ircomm_tty_do_softint(void *private_);
66 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
67 static void ircomm_tty_stop(struct tty_struct *tty);
68
69 static int ircomm_tty_data_indication(void *instance, void *sap,
70 struct sk_buff *skb);
71 static int ircomm_tty_control_indication(void *instance, void *sap,
72 struct sk_buff *skb);
73 static void ircomm_tty_flow_indication(void *instance, void *sap,
74 LOCAL_FLOW cmd);
75 #ifdef CONFIG_PROC_FS
76 static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
77 int *eof, void *unused);
78 #endif /* CONFIG_PROC_FS */
79 static struct tty_driver *driver;
80
81 hashbin_t *ircomm_tty = NULL;
82
83 static struct tty_operations ops = {
84 .open = ircomm_tty_open,
85 .close = ircomm_tty_close,
86 .write = ircomm_tty_write,
87 .write_room = ircomm_tty_write_room,
88 .chars_in_buffer = ircomm_tty_chars_in_buffer,
89 .flush_buffer = ircomm_tty_flush_buffer,
90 .ioctl = ircomm_tty_ioctl, /* ircomm_tty_ioctl.c */
91 .tiocmget = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
92 .tiocmset = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
93 .throttle = ircomm_tty_throttle,
94 .unthrottle = ircomm_tty_unthrottle,
95 .send_xchar = ircomm_tty_send_xchar,
96 .set_termios = ircomm_tty_set_termios,
97 .stop = ircomm_tty_stop,
98 .start = ircomm_tty_start,
99 .hangup = ircomm_tty_hangup,
100 .wait_until_sent = ircomm_tty_wait_until_sent,
101 #ifdef CONFIG_PROC_FS
102 .read_proc = ircomm_tty_read_proc,
103 #endif /* CONFIG_PROC_FS */
104 };
105
106 /*
107 * Function ircomm_tty_init()
108 *
109 * Init IrCOMM TTY layer/driver
110 *
111 */
112 static int __init ircomm_tty_init(void)
113 {
114 driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
115 if (!driver)
116 return -ENOMEM;
117 ircomm_tty = hashbin_new(HB_LOCK);
118 if (ircomm_tty == NULL) {
119 IRDA_ERROR("%s(), can't allocate hashbin!\n", __FUNCTION__);
120 put_tty_driver(driver);
121 return -ENOMEM;
122 }
123
124 driver->owner = THIS_MODULE;
125 driver->driver_name = "ircomm";
126 driver->name = "ircomm";
127 driver->devfs_name = "ircomm";
128 driver->major = IRCOMM_TTY_MAJOR;
129 driver->minor_start = IRCOMM_TTY_MINOR;
130 driver->type = TTY_DRIVER_TYPE_SERIAL;
131 driver->subtype = SERIAL_TYPE_NORMAL;
132 driver->init_termios = tty_std_termios;
133 driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
134 driver->flags = TTY_DRIVER_REAL_RAW;
135 tty_set_operations(driver, &ops);
136 if (tty_register_driver(driver)) {
137 IRDA_ERROR("%s(): Couldn't register serial driver\n",
138 __FUNCTION__);
139 put_tty_driver(driver);
140 return -1;
141 }
142 return 0;
143 }
144
145 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
146 {
147 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
148
149 IRDA_ASSERT(self != NULL, return;);
150 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
151
152 ircomm_tty_shutdown(self);
153
154 self->magic = 0;
155 kfree(self);
156 }
157
158 /*
159 * Function ircomm_tty_cleanup ()
160 *
161 * Remove IrCOMM TTY layer/driver
162 *
163 */
164 static void __exit ircomm_tty_cleanup(void)
165 {
166 int ret;
167
168 IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
169
170 ret = tty_unregister_driver(driver);
171 if (ret) {
172 IRDA_ERROR("%s(), failed to unregister driver\n",
173 __FUNCTION__);
174 return;
175 }
176
177 hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
178 put_tty_driver(driver);
179 }
180
181 /*
182 * Function ircomm_startup (self)
183 *
184 *
185 *
186 */
187 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
188 {
189 notify_t notify;
190 int ret = -ENODEV;
191
192 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
193
194 IRDA_ASSERT(self != NULL, return -1;);
195 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
196
197 /* Check if already open */
198 if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) {
199 IRDA_DEBUG(2, "%s(), already open so break out!\n", __FUNCTION__ );
200 return 0;
201 }
202
203 /* Register with IrCOMM */
204 irda_notify_init(&notify);
205 /* These callbacks we must handle ourselves */
206 notify.data_indication = ircomm_tty_data_indication;
207 notify.udata_indication = ircomm_tty_control_indication;
208 notify.flow_indication = ircomm_tty_flow_indication;
209
210 /* Use the ircomm_tty interface for these ones */
211 notify.disconnect_indication = ircomm_tty_disconnect_indication;
212 notify.connect_confirm = ircomm_tty_connect_confirm;
213 notify.connect_indication = ircomm_tty_connect_indication;
214 strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
215 notify.instance = self;
216
217 if (!self->ircomm) {
218 self->ircomm = ircomm_open(&notify, self->service_type,
219 self->line);
220 }
221 if (!self->ircomm)
222 goto err;
223
224 self->slsap_sel = self->ircomm->slsap_sel;
225
226 /* Connect IrCOMM link with remote device */
227 ret = ircomm_tty_attach_cable(self);
228 if (ret < 0) {
229 IRDA_ERROR("%s(), error attaching cable!\n", __FUNCTION__);
230 goto err;
231 }
232
233 return 0;
234 err:
235 clear_bit(ASYNC_B_INITIALIZED, &self->flags);
236 return ret;
237 }
238
239 /*
240 * Function ircomm_block_til_ready (self, filp)
241 *
242 *
243 *
244 */
245 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
246 struct file *filp)
247 {
248 DECLARE_WAITQUEUE(wait, current);
249 int retval;
250 int do_clocal = 0, extra_count = 0;
251 unsigned long flags;
252 struct tty_struct *tty;
253
254 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
255
256 tty = self->tty;
257
258 /*
259 * If non-blocking mode is set, or the port is not enabled,
260 * then make the check up front and then exit.
261 */
262 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
263 /* nonblock mode is set or port is not enabled */
264 self->flags |= ASYNC_NORMAL_ACTIVE;
265 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __FUNCTION__ );
266 return 0;
267 }
268
269 if (tty->termios->c_cflag & CLOCAL) {
270 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __FUNCTION__ );
271 do_clocal = 1;
272 }
273
274 /* Wait for carrier detect and the line to become
275 * free (i.e., not in use by the callout). While we are in
276 * this loop, self->open_count is dropped by one, so that
277 * mgsl_close() knows when to free things. We restore it upon
278 * exit, either normal or abnormal.
279 */
280
281 retval = 0;
282 add_wait_queue(&self->open_wait, &wait);
283
284 IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
285 __FILE__,__LINE__, tty->driver->name, self->open_count );
286
287 /* As far as I can see, we protect open_count - Jean II */
288 spin_lock_irqsave(&self->spinlock, flags);
289 if (!tty_hung_up_p(filp)) {
290 extra_count = 1;
291 self->open_count--;
292 }
293 spin_unlock_irqrestore(&self->spinlock, flags);
294 self->blocked_open++;
295
296 while (1) {
297 if (tty->termios->c_cflag & CBAUD) {
298 /* Here, we use to lock those two guys, but
299 * as ircomm_param_request() does it itself,
300 * I don't see the point (and I see the deadlock).
301 * Jean II */
302 self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR;
303
304 ircomm_param_request(self, IRCOMM_DTE, TRUE);
305 }
306
307 current->state = TASK_INTERRUPTIBLE;
308
309 if (tty_hung_up_p(filp) ||
310 !test_bit(ASYNC_B_INITIALIZED, &self->flags)) {
311 retval = (self->flags & ASYNC_HUP_NOTIFY) ?
312 -EAGAIN : -ERESTARTSYS;
313 break;
314 }
315
316 /*
317 * Check if link is ready now. Even if CLOCAL is
318 * specified, we cannot return before the IrCOMM link is
319 * ready
320 */
321 if (!test_bit(ASYNC_B_CLOSING, &self->flags) &&
322 (do_clocal || (self->settings.dce & IRCOMM_CD)) &&
323 self->state == IRCOMM_TTY_READY)
324 {
325 break;
326 }
327
328 if (signal_pending(current)) {
329 retval = -ERESTARTSYS;
330 break;
331 }
332
333 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
334 __FILE__,__LINE__, tty->driver->name, self->open_count );
335
336 schedule();
337 }
338
339 __set_current_state(TASK_RUNNING);
340 remove_wait_queue(&self->open_wait, &wait);
341
342 if (extra_count) {
343 /* ++ is not atomic, so this should be protected - Jean II */
344 spin_lock_irqsave(&self->spinlock, flags);
345 self->open_count++;
346 spin_unlock_irqrestore(&self->spinlock, flags);
347 }
348 self->blocked_open--;
349
350 IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
351 __FILE__,__LINE__, tty->driver->name, self->open_count);
352
353 if (!retval)
354 self->flags |= ASYNC_NORMAL_ACTIVE;
355
356 return retval;
357 }
358
359 /*
360 * Function ircomm_tty_open (tty, filp)
361 *
362 * This routine is called when a particular tty device is opened. This
363 * routine is mandatory; if this routine is not filled in, the attempted
364 * open will fail with ENODEV.
365 */
366 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
367 {
368 struct ircomm_tty_cb *self;
369 unsigned int line;
370 unsigned long flags;
371 int ret;
372
373 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
374
375 line = tty->index;
376 if ((line < 0) || (line >= IRCOMM_TTY_PORTS)) {
377 return -ENODEV;
378 }
379
380 /* Check if instance already exists */
381 self = hashbin_lock_find(ircomm_tty, line, NULL);
382 if (!self) {
383 /* No, so make new instance */
384 self = kmalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
385 if (self == NULL) {
386 IRDA_ERROR("%s(), kmalloc failed!\n", __FUNCTION__);
387 return -ENOMEM;
388 }
389 memset(self, 0, sizeof(struct ircomm_tty_cb));
390
391 self->magic = IRCOMM_TTY_MAGIC;
392 self->flow = FLOW_STOP;
393
394 self->line = line;
395 INIT_WORK(&self->tqueue, ircomm_tty_do_softint, self);
396 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
397 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
398 self->close_delay = 5*HZ/10;
399 self->closing_wait = 30*HZ;
400
401 /* Init some important stuff */
402 init_timer(&self->watchdog_timer);
403 init_waitqueue_head(&self->open_wait);
404 init_waitqueue_head(&self->close_wait);
405 spin_lock_init(&self->spinlock);
406
407 /*
408 * Force TTY into raw mode by default which is usually what
409 * we want for IrCOMM and IrLPT. This way applications will
410 * not have to twiddle with printcap etc.
411 */
412 tty->termios->c_iflag = 0;
413 tty->termios->c_oflag = 0;
414
415 /* Insert into hash */
416 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
417 }
418 /* ++ is not atomic, so this should be protected - Jean II */
419 spin_lock_irqsave(&self->spinlock, flags);
420 self->open_count++;
421
422 tty->driver_data = self;
423 self->tty = tty;
424 spin_unlock_irqrestore(&self->spinlock, flags);
425
426 IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __FUNCTION__ , tty->driver->name,
427 self->line, self->open_count);
428
429 /* Not really used by us, but lets do it anyway */
430 self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
431
432 /*
433 * If the port is the middle of closing, bail out now
434 */
435 if (tty_hung_up_p(filp) ||
436 test_bit(ASYNC_B_CLOSING, &self->flags)) {
437
438 /* Hm, why are we blocking on ASYNC_CLOSING if we
439 * do return -EAGAIN/-ERESTARTSYS below anyway?
440 * IMHO it's either not needed in the first place
441 * or for some reason we need to make sure the async
442 * closing has been finished - if so, wouldn't we
443 * probably better sleep uninterruptible?
444 */
445
446 if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) {
447 IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
448 __FUNCTION__);
449 return -ERESTARTSYS;
450 }
451
452 #ifdef SERIAL_DO_RESTART
453 return ((self->flags & ASYNC_HUP_NOTIFY) ?
454 -EAGAIN : -ERESTARTSYS);
455 #else
456 return -EAGAIN;
457 #endif
458 }
459
460 /* Check if this is a "normal" ircomm device, or an irlpt device */
461 if (line < 0x10) {
462 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
463 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
464 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
465 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
466 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __FUNCTION__ );
467 } else {
468 IRDA_DEBUG(2, "%s(), IrLPT device\n", __FUNCTION__ );
469 self->service_type = IRCOMM_3_WIRE_RAW;
470 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
471 }
472
473 ret = ircomm_tty_startup(self);
474 if (ret)
475 return ret;
476
477 ret = ircomm_tty_block_til_ready(self, filp);
478 if (ret) {
479 IRDA_DEBUG(2,
480 "%s(), returning after block_til_ready with %d\n", __FUNCTION__ ,
481 ret);
482
483 return ret;
484 }
485 return 0;
486 }
487
488 /*
489 * Function ircomm_tty_close (tty, filp)
490 *
491 * This routine is called when a particular tty device is closed.
492 *
493 */
494 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
495 {
496 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
497 unsigned long flags;
498
499 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
500
501 if (!tty)
502 return;
503
504 IRDA_ASSERT(self != NULL, return;);
505 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
506
507 spin_lock_irqsave(&self->spinlock, flags);
508
509 if (tty_hung_up_p(filp)) {
510 spin_unlock_irqrestore(&self->spinlock, flags);
511
512 IRDA_DEBUG(0, "%s(), returning 1\n", __FUNCTION__ );
513 return;
514 }
515
516 if ((tty->count == 1) && (self->open_count != 1)) {
517 /*
518 * Uh, oh. tty->count is 1, which means that the tty
519 * structure will be freed. state->count should always
520 * be one in these conditions. If it's greater than
521 * one, we've got real problems, since it means the
522 * serial port won't be shutdown.
523 */
524 IRDA_DEBUG(0, "%s(), bad serial port count; "
525 "tty->count is 1, state->count is %d\n", __FUNCTION__ ,
526 self->open_count);
527 self->open_count = 1;
528 }
529
530 if (--self->open_count < 0) {
531 IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n",
532 __FUNCTION__, self->line, self->open_count);
533 self->open_count = 0;
534 }
535 if (self->open_count) {
536 spin_unlock_irqrestore(&self->spinlock, flags);
537
538 IRDA_DEBUG(0, "%s(), open count > 0\n", __FUNCTION__ );
539 return;
540 }
541
542 /* Hum... Should be test_and_set_bit ??? - Jean II */
543 set_bit(ASYNC_B_CLOSING, &self->flags);
544
545 /* We need to unlock here (we were unlocking at the end of this
546 * function), because tty_wait_until_sent() may schedule.
547 * I don't know if the rest should be protected somehow,
548 * so someone should check. - Jean II */
549 spin_unlock_irqrestore(&self->spinlock, flags);
550
551 /*
552 * Now we wait for the transmit buffer to clear; and we notify
553 * the line discipline to only process XON/XOFF characters.
554 */
555 tty->closing = 1;
556 if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
557 tty_wait_until_sent(tty, self->closing_wait);
558
559 ircomm_tty_shutdown(self);
560
561 if (tty->driver->flush_buffer)
562 tty->driver->flush_buffer(tty);
563 if (tty->ldisc.flush_buffer)
564 tty->ldisc.flush_buffer(tty);
565
566 tty->closing = 0;
567 self->tty = NULL;
568
569 if (self->blocked_open) {
570 if (self->close_delay)
571 schedule_timeout_interruptible(self->close_delay);
572 wake_up_interruptible(&self->open_wait);
573 }
574
575 self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
576 wake_up_interruptible(&self->close_wait);
577 }
578
579 /*
580 * Function ircomm_tty_flush_buffer (tty)
581 *
582 *
583 *
584 */
585 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
586 {
587 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
588
589 IRDA_ASSERT(self != NULL, return;);
590 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
591
592 /*
593 * Let do_softint() do this to avoid race condition with
594 * do_softint() ;-)
595 */
596 schedule_work(&self->tqueue);
597 }
598
599 /*
600 * Function ircomm_tty_do_softint (private_)
601 *
602 * We use this routine to give the write wakeup to the user at at a
603 * safe time (as fast as possible after write have completed). This
604 * can be compared to the Tx interrupt.
605 */
606 static void ircomm_tty_do_softint(void *private_)
607 {
608 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) private_;
609 struct tty_struct *tty;
610 unsigned long flags;
611 struct sk_buff *skb, *ctrl_skb;
612
613 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
614
615 if (!self || self->magic != IRCOMM_TTY_MAGIC)
616 return;
617
618 tty = self->tty;
619 if (!tty)
620 return;
621
622 /* Unlink control buffer */
623 spin_lock_irqsave(&self->spinlock, flags);
624
625 ctrl_skb = self->ctrl_skb;
626 self->ctrl_skb = NULL;
627
628 spin_unlock_irqrestore(&self->spinlock, flags);
629
630 /* Flush control buffer if any */
631 if(ctrl_skb) {
632 if(self->flow == FLOW_START)
633 ircomm_control_request(self->ircomm, ctrl_skb);
634 /* Drop reference count - see ircomm_ttp_data_request(). */
635 dev_kfree_skb(ctrl_skb);
636 }
637
638 if (tty->hw_stopped)
639 return;
640
641 /* Unlink transmit buffer */
642 spin_lock_irqsave(&self->spinlock, flags);
643
644 skb = self->tx_skb;
645 self->tx_skb = NULL;
646
647 spin_unlock_irqrestore(&self->spinlock, flags);
648
649 /* Flush transmit buffer if any */
650 if (skb) {
651 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
652 /* Drop reference count - see ircomm_ttp_data_request(). */
653 dev_kfree_skb(skb);
654 }
655
656 /* Check if user (still) wants to be waken up */
657 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
658 tty->ldisc.write_wakeup)
659 {
660 (tty->ldisc.write_wakeup)(tty);
661 }
662 wake_up_interruptible(&tty->write_wait);
663 }
664
665 /*
666 * Function ircomm_tty_write (tty, buf, count)
667 *
668 * This routine is called by the kernel to write a series of characters
669 * to the tty device. The characters may come from user space or kernel
670 * space. This routine will return the number of characters actually
671 * accepted for writing. This routine is mandatory.
672 */
673 static int ircomm_tty_write(struct tty_struct *tty,
674 const unsigned char *buf, int count)
675 {
676 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
677 unsigned long flags;
678 struct sk_buff *skb;
679 int tailroom = 0;
680 int len = 0;
681 int size;
682
683 IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __FUNCTION__ , count,
684 tty->hw_stopped);
685
686 IRDA_ASSERT(self != NULL, return -1;);
687 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
688
689 /* We may receive packets from the TTY even before we have finished
690 * our setup. Not cool.
691 * The problem is that we don't know the final header and data size
692 * to create the proper skb, so any skb we would create would have
693 * bogus header and data size, so need care.
694 * We use a bogus header size to safely detect this condition.
695 * Another problem is that hw_stopped was set to 0 way before it
696 * should be, so we would drop this skb. It should now be fixed.
697 * One option is to not accept data until we are properly setup.
698 * But, I suspect that when it happens, the ppp line discipline
699 * just "drops" the data, which might screw up connect scripts.
700 * The second option is to create a "safe skb", with large header
701 * and small size (see ircomm_tty_open() for values).
702 * We just need to make sure that when the real values get filled,
703 * we don't mess up the original "safe skb" (see tx_data_size).
704 * Jean II */
705 if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
706 IRDA_DEBUG(1, "%s() : not initialised\n", __FUNCTION__);
707 #ifdef IRCOMM_NO_TX_BEFORE_INIT
708 /* We didn't consume anything, TTY will retry */
709 return 0;
710 #endif
711 }
712
713 if (count < 1)
714 return 0;
715
716 /* Protect our manipulation of self->tx_skb and related */
717 spin_lock_irqsave(&self->spinlock, flags);
718
719 /* Fetch current transmit buffer */
720 skb = self->tx_skb;
721
722 /*
723 * Send out all the data we get, possibly as multiple fragmented
724 * frames, but this will only happen if the data is larger than the
725 * max data size. The normal case however is just the opposite, and
726 * this function may be called multiple times, and will then actually
727 * defragment the data and send it out as one packet as soon as
728 * possible, but at a safer point in time
729 */
730 while (count) {
731 size = count;
732
733 /* Adjust data size to the max data size */
734 if (size > self->max_data_size)
735 size = self->max_data_size;
736
737 /*
738 * Do we already have a buffer ready for transmit, or do
739 * we need to allocate a new frame
740 */
741 if (skb) {
742 /*
743 * Any room for more data at the end of the current
744 * transmit buffer? Cannot use skb_tailroom, since
745 * dev_alloc_skb gives us a larger skb than we
746 * requested
747 * Note : use tx_data_size, because max_data_size
748 * may have changed and we don't want to overwrite
749 * the skb. - Jean II
750 */
751 if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
752 /* Adjust data to tailroom */
753 if (size > tailroom)
754 size = tailroom;
755 } else {
756 /*
757 * Current transmit frame is full, so break
758 * out, so we can send it as soon as possible
759 */
760 break;
761 }
762 } else {
763 /* Prepare a full sized frame */
764 skb = dev_alloc_skb(self->max_data_size+
765 self->max_header_size);
766 if (!skb) {
767 spin_unlock_irqrestore(&self->spinlock, flags);
768 return -ENOBUFS;
769 }
770 skb_reserve(skb, self->max_header_size);
771 self->tx_skb = skb;
772 /* Remember skb size because max_data_size may
773 * change later on - Jean II */
774 self->tx_data_size = self->max_data_size;
775 }
776
777 /* Copy data */
778 memcpy(skb_put(skb,size), buf + len, size);
779
780 count -= size;
781 len += size;
782 }
783
784 spin_unlock_irqrestore(&self->spinlock, flags);
785
786 /*
787 * Schedule a new thread which will transmit the frame as soon
788 * as possible, but at a safe point in time. We do this so the
789 * "user" can give us data multiple times, as PPP does (because of
790 * its 256 byte tx buffer). We will then defragment and send out
791 * all this data as one single packet.
792 */
793 schedule_work(&self->tqueue);
794
795 return len;
796 }
797
798 /*
799 * Function ircomm_tty_write_room (tty)
800 *
801 * This routine returns the numbers of characters the tty driver will
802 * accept for queuing to be written. This number is subject to change as
803 * output buffers get emptied, or if the output flow control is acted.
804 */
805 static int ircomm_tty_write_room(struct tty_struct *tty)
806 {
807 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
808 unsigned long flags;
809 int ret;
810
811 IRDA_ASSERT(self != NULL, return -1;);
812 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
813
814 #ifdef IRCOMM_NO_TX_BEFORE_INIT
815 /* max_header_size tells us if the channel is initialised or not. */
816 if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
817 /* Don't bother us yet */
818 return 0;
819 #endif
820
821 /* Check if we are allowed to transmit any data.
822 * hw_stopped is the regular flow control.
823 * Jean II */
824 if (tty->hw_stopped)
825 ret = 0;
826 else {
827 spin_lock_irqsave(&self->spinlock, flags);
828 if (self->tx_skb)
829 ret = self->tx_data_size - self->tx_skb->len;
830 else
831 ret = self->max_data_size;
832 spin_unlock_irqrestore(&self->spinlock, flags);
833 }
834 IRDA_DEBUG(2, "%s(), ret=%d\n", __FUNCTION__ , ret);
835
836 return ret;
837 }
838
839 /*
840 * Function ircomm_tty_wait_until_sent (tty, timeout)
841 *
842 * This routine waits until the device has written out all of the
843 * characters in its transmitter FIFO.
844 */
845 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
846 {
847 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
848 unsigned long orig_jiffies, poll_time;
849 unsigned long flags;
850
851 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
852
853 IRDA_ASSERT(self != NULL, return;);
854 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
855
856 orig_jiffies = jiffies;
857
858 /* Set poll time to 200 ms */
859 poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
860
861 spin_lock_irqsave(&self->spinlock, flags);
862 while (self->tx_skb && self->tx_skb->len) {
863 spin_unlock_irqrestore(&self->spinlock, flags);
864 schedule_timeout_interruptible(poll_time);
865 spin_lock_irqsave(&self->spinlock, flags);
866 if (signal_pending(current))
867 break;
868 if (timeout && time_after(jiffies, orig_jiffies + timeout))
869 break;
870 }
871 spin_unlock_irqrestore(&self->spinlock, flags);
872 current->state = TASK_RUNNING;
873 }
874
875 /*
876 * Function ircomm_tty_throttle (tty)
877 *
878 * This routine notifies the tty driver that input buffers for the line
879 * discipline are close to full, and it should somehow signal that no
880 * more characters should be sent to the tty.
881 */
882 static void ircomm_tty_throttle(struct tty_struct *tty)
883 {
884 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
885
886 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
887
888 IRDA_ASSERT(self != NULL, return;);
889 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
890
891 /* Software flow control? */
892 if (I_IXOFF(tty))
893 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
894
895 /* Hardware flow control? */
896 if (tty->termios->c_cflag & CRTSCTS) {
897 self->settings.dte &= ~IRCOMM_RTS;
898 self->settings.dte |= IRCOMM_DELTA_RTS;
899
900 ircomm_param_request(self, IRCOMM_DTE, TRUE);
901 }
902
903 ircomm_flow_request(self->ircomm, FLOW_STOP);
904 }
905
906 /*
907 * Function ircomm_tty_unthrottle (tty)
908 *
909 * This routine notifies the tty drivers that it should signals that
910 * characters can now be sent to the tty without fear of overrunning the
911 * input buffers of the line disciplines.
912 */
913 static void ircomm_tty_unthrottle(struct tty_struct *tty)
914 {
915 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
916
917 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
918
919 IRDA_ASSERT(self != NULL, return;);
920 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
921
922 /* Using software flow control? */
923 if (I_IXOFF(tty)) {
924 ircomm_tty_send_xchar(tty, START_CHAR(tty));
925 }
926
927 /* Using hardware flow control? */
928 if (tty->termios->c_cflag & CRTSCTS) {
929 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
930
931 ircomm_param_request(self, IRCOMM_DTE, TRUE);
932 IRDA_DEBUG(1, "%s(), FLOW_START\n", __FUNCTION__ );
933 }
934 ircomm_flow_request(self->ircomm, FLOW_START);
935 }
936
937 /*
938 * Function ircomm_tty_chars_in_buffer (tty)
939 *
940 * Indicates if there are any data in the buffer
941 *
942 */
943 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
944 {
945 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
946 unsigned long flags;
947 int len = 0;
948
949 IRDA_ASSERT(self != NULL, return -1;);
950 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
951
952 spin_lock_irqsave(&self->spinlock, flags);
953
954 if (self->tx_skb)
955 len = self->tx_skb->len;
956
957 spin_unlock_irqrestore(&self->spinlock, flags);
958
959 return len;
960 }
961
962 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
963 {
964 unsigned long flags;
965
966 IRDA_ASSERT(self != NULL, return;);
967 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
968
969 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
970
971 if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
972 return;
973
974 ircomm_tty_detach_cable(self);
975
976 spin_lock_irqsave(&self->spinlock, flags);
977
978 del_timer(&self->watchdog_timer);
979
980 /* Free parameter buffer */
981 if (self->ctrl_skb) {
982 dev_kfree_skb(self->ctrl_skb);
983 self->ctrl_skb = NULL;
984 }
985
986 /* Free transmit buffer */
987 if (self->tx_skb) {
988 dev_kfree_skb(self->tx_skb);
989 self->tx_skb = NULL;
990 }
991
992 if (self->ircomm) {
993 ircomm_close(self->ircomm);
994 self->ircomm = NULL;
995 }
996
997 spin_unlock_irqrestore(&self->spinlock, flags);
998 }
999
1000 /*
1001 * Function ircomm_tty_hangup (tty)
1002 *
1003 * This routine notifies the tty driver that it should hangup the tty
1004 * device.
1005 *
1006 */
1007 static void ircomm_tty_hangup(struct tty_struct *tty)
1008 {
1009 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1010 unsigned long flags;
1011
1012 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
1013
1014 IRDA_ASSERT(self != NULL, return;);
1015 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1016
1017 if (!tty)
1018 return;
1019
1020 /* ircomm_tty_flush_buffer(tty); */
1021 ircomm_tty_shutdown(self);
1022
1023 /* I guess we need to lock here - Jean II */
1024 spin_lock_irqsave(&self->spinlock, flags);
1025 self->flags &= ~ASYNC_NORMAL_ACTIVE;
1026 self->tty = NULL;
1027 self->open_count = 0;
1028 spin_unlock_irqrestore(&self->spinlock, flags);
1029
1030 wake_up_interruptible(&self->open_wait);
1031 }
1032
1033 /*
1034 * Function ircomm_tty_send_xchar (tty, ch)
1035 *
1036 * This routine is used to send a high-priority XON/XOFF character to
1037 * the device.
1038 */
1039 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1040 {
1041 IRDA_DEBUG(0, "%s(), not impl\n", __FUNCTION__ );
1042 }
1043
1044 /*
1045 * Function ircomm_tty_start (tty)
1046 *
1047 * This routine notifies the tty driver that it resume sending
1048 * characters to the tty device.
1049 */
1050 void ircomm_tty_start(struct tty_struct *tty)
1051 {
1052 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1053
1054 ircomm_flow_request(self->ircomm, FLOW_START);
1055 }
1056
1057 /*
1058 * Function ircomm_tty_stop (tty)
1059 *
1060 * This routine notifies the tty driver that it should stop outputting
1061 * characters to the tty device.
1062 */
1063 static void ircomm_tty_stop(struct tty_struct *tty)
1064 {
1065 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1066
1067 IRDA_ASSERT(self != NULL, return;);
1068 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1069
1070 ircomm_flow_request(self->ircomm, FLOW_STOP);
1071 }
1072
1073 /*
1074 * Function ircomm_check_modem_status (self)
1075 *
1076 * Check for any changes in the DCE's line settings. This function should
1077 * be called whenever the dce parameter settings changes, to update the
1078 * flow control settings and other things
1079 */
1080 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1081 {
1082 struct tty_struct *tty;
1083 int status;
1084
1085 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
1086
1087 IRDA_ASSERT(self != NULL, return;);
1088 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1089
1090 tty = self->tty;
1091
1092 status = self->settings.dce;
1093
1094 if (status & IRCOMM_DCE_DELTA_ANY) {
1095 /*wake_up_interruptible(&self->delta_msr_wait);*/
1096 }
1097 if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1098 IRDA_DEBUG(2,
1099 "%s(), ircomm%d CD now %s...\n", __FUNCTION__ , self->line,
1100 (status & IRCOMM_CD) ? "on" : "off");
1101
1102 if (status & IRCOMM_CD) {
1103 wake_up_interruptible(&self->open_wait);
1104 } else {
1105 IRDA_DEBUG(2,
1106 "%s(), Doing serial hangup..\n", __FUNCTION__ );
1107 if (tty)
1108 tty_hangup(tty);
1109
1110 /* Hangup will remote the tty, so better break out */
1111 return;
1112 }
1113 }
1114 if (self->flags & ASYNC_CTS_FLOW) {
1115 if (tty->hw_stopped) {
1116 if (status & IRCOMM_CTS) {
1117 IRDA_DEBUG(2,
1118 "%s(), CTS tx start...\n", __FUNCTION__ );
1119 tty->hw_stopped = 0;
1120
1121 /* Wake up processes blocked on open */
1122 wake_up_interruptible(&self->open_wait);
1123
1124 schedule_work(&self->tqueue);
1125 return;
1126 }
1127 } else {
1128 if (!(status & IRCOMM_CTS)) {
1129 IRDA_DEBUG(2,
1130 "%s(), CTS tx stop...\n", __FUNCTION__ );
1131 tty->hw_stopped = 1;
1132 }
1133 }
1134 }
1135 }
1136
1137 /*
1138 * Function ircomm_tty_data_indication (instance, sap, skb)
1139 *
1140 * Handle incoming data, and deliver it to the line discipline
1141 *
1142 */
1143 static int ircomm_tty_data_indication(void *instance, void *sap,
1144 struct sk_buff *skb)
1145 {
1146 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1147
1148 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
1149
1150 IRDA_ASSERT(self != NULL, return -1;);
1151 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1152 IRDA_ASSERT(skb != NULL, return -1;);
1153
1154 if (!self->tty) {
1155 IRDA_DEBUG(0, "%s(), no tty!\n", __FUNCTION__ );
1156 return 0;
1157 }
1158
1159 /*
1160 * If we receive data when hardware is stopped then something is wrong.
1161 * We try to poll the peers line settings to check if we are up todate.
1162 * Devices like WinCE can do this, and since they don't send any
1163 * params, we can just as well declare the hardware for running.
1164 */
1165 if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1166 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __FUNCTION__ );
1167 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1168
1169 /* We can just as well declare the hardware for running */
1170 ircomm_tty_send_initial_parameters(self);
1171 ircomm_tty_link_established(self);
1172 }
1173
1174 /*
1175 * Just give it over to the line discipline. There is no need to
1176 * involve the flip buffers, since we are not running in an interrupt
1177 * handler
1178 */
1179 self->tty->ldisc.receive_buf(self->tty, skb->data, NULL, skb->len);
1180
1181 /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1182
1183 return 0;
1184 }
1185
1186 /*
1187 * Function ircomm_tty_control_indication (instance, sap, skb)
1188 *
1189 * Parse all incoming parameters (easy!)
1190 *
1191 */
1192 static int ircomm_tty_control_indication(void *instance, void *sap,
1193 struct sk_buff *skb)
1194 {
1195 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1196 int clen;
1197
1198 IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
1199
1200 IRDA_ASSERT(self != NULL, return -1;);
1201 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1202 IRDA_ASSERT(skb != NULL, return -1;);
1203
1204 clen = skb->data[0];
1205
1206 irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1207 &ircomm_param_info);
1208
1209 /* No need to kfree_skb - see ircomm_control_indication() */
1210
1211 return 0;
1212 }
1213
1214 /*
1215 * Function ircomm_tty_flow_indication (instance, sap, cmd)
1216 *
1217 * This function is called by IrTTP when it wants us to slow down the
1218 * transmission of data. We just mark the hardware as stopped, and wait
1219 * for IrTTP to notify us that things are OK again.
1220 */
1221 static void ircomm_tty_flow_indication(void *instance, void *sap,
1222 LOCAL_FLOW cmd)
1223 {
1224 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1225 struct tty_struct *tty;
1226
1227 IRDA_ASSERT(self != NULL, return;);
1228 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1229
1230 tty = self->tty;
1231
1232 switch (cmd) {
1233 case FLOW_START:
1234 IRDA_DEBUG(2, "%s(), hw start!\n", __FUNCTION__ );
1235 tty->hw_stopped = 0;
1236
1237 /* ircomm_tty_do_softint will take care of the rest */
1238 schedule_work(&self->tqueue);
1239 break;
1240 default: /* If we get here, something is very wrong, better stop */
1241 case FLOW_STOP:
1242 IRDA_DEBUG(2, "%s(), hw stopped!\n", __FUNCTION__ );
1243 tty->hw_stopped = 1;
1244 break;
1245 }
1246 self->flow = cmd;
1247 }
1248
1249 static int ircomm_tty_line_info(struct ircomm_tty_cb *self, char *buf)
1250 {
1251 int ret=0;
1252
1253 ret += sprintf(buf+ret, "State: %s\n", ircomm_tty_state[self->state]);
1254
1255 ret += sprintf(buf+ret, "Service type: ");
1256 if (self->service_type & IRCOMM_9_WIRE)
1257 ret += sprintf(buf+ret, "9_WIRE");
1258 else if (self->service_type & IRCOMM_3_WIRE)
1259 ret += sprintf(buf+ret, "3_WIRE");
1260 else if (self->service_type & IRCOMM_3_WIRE_RAW)
1261 ret += sprintf(buf+ret, "3_WIRE_RAW");
1262 else
1263 ret += sprintf(buf+ret, "No common service type!\n");
1264 ret += sprintf(buf+ret, "\n");
1265
1266 ret += sprintf(buf+ret, "Port name: %s\n", self->settings.port_name);
1267
1268 ret += sprintf(buf+ret, "DTE status: ");
1269 if (self->settings.dte & IRCOMM_RTS)
1270 ret += sprintf(buf+ret, "RTS|");
1271 if (self->settings.dte & IRCOMM_DTR)
1272 ret += sprintf(buf+ret, "DTR|");
1273 if (self->settings.dte)
1274 ret--; /* remove the last | */
1275 ret += sprintf(buf+ret, "\n");
1276
1277 ret += sprintf(buf+ret, "DCE status: ");
1278 if (self->settings.dce & IRCOMM_CTS)
1279 ret += sprintf(buf+ret, "CTS|");
1280 if (self->settings.dce & IRCOMM_DSR)
1281 ret += sprintf(buf+ret, "DSR|");
1282 if (self->settings.dce & IRCOMM_CD)
1283 ret += sprintf(buf+ret, "CD|");
1284 if (self->settings.dce & IRCOMM_RI)
1285 ret += sprintf(buf+ret, "RI|");
1286 if (self->settings.dce)
1287 ret--; /* remove the last | */
1288 ret += sprintf(buf+ret, "\n");
1289
1290 ret += sprintf(buf+ret, "Configuration: ");
1291 if (!self->settings.null_modem)
1292 ret += sprintf(buf+ret, "DTE <-> DCE\n");
1293 else
1294 ret += sprintf(buf+ret,
1295 "DTE <-> DTE (null modem emulation)\n");
1296
1297 ret += sprintf(buf+ret, "Data rate: %d\n", self->settings.data_rate);
1298
1299 ret += sprintf(buf+ret, "Flow control: ");
1300 if (self->settings.flow_control & IRCOMM_XON_XOFF_IN)
1301 ret += sprintf(buf+ret, "XON_XOFF_IN|");
1302 if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT)
1303 ret += sprintf(buf+ret, "XON_XOFF_OUT|");
1304 if (self->settings.flow_control & IRCOMM_RTS_CTS_IN)
1305 ret += sprintf(buf+ret, "RTS_CTS_IN|");
1306 if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT)
1307 ret += sprintf(buf+ret, "RTS_CTS_OUT|");
1308 if (self->settings.flow_control & IRCOMM_DSR_DTR_IN)
1309 ret += sprintf(buf+ret, "DSR_DTR_IN|");
1310 if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT)
1311 ret += sprintf(buf+ret, "DSR_DTR_OUT|");
1312 if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN)
1313 ret += sprintf(buf+ret, "ENQ_ACK_IN|");
1314 if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT)
1315 ret += sprintf(buf+ret, "ENQ_ACK_OUT|");
1316 if (self->settings.flow_control)
1317 ret--; /* remove the last | */
1318 ret += sprintf(buf+ret, "\n");
1319
1320 ret += sprintf(buf+ret, "Flags: ");
1321 if (self->flags & ASYNC_CTS_FLOW)
1322 ret += sprintf(buf+ret, "ASYNC_CTS_FLOW|");
1323 if (self->flags & ASYNC_CHECK_CD)
1324 ret += sprintf(buf+ret, "ASYNC_CHECK_CD|");
1325 if (self->flags & ASYNC_INITIALIZED)
1326 ret += sprintf(buf+ret, "ASYNC_INITIALIZED|");
1327 if (self->flags & ASYNC_LOW_LATENCY)
1328 ret += sprintf(buf+ret, "ASYNC_LOW_LATENCY|");
1329 if (self->flags & ASYNC_CLOSING)
1330 ret += sprintf(buf+ret, "ASYNC_CLOSING|");
1331 if (self->flags & ASYNC_NORMAL_ACTIVE)
1332 ret += sprintf(buf+ret, "ASYNC_NORMAL_ACTIVE|");
1333 if (self->flags)
1334 ret--; /* remove the last | */
1335 ret += sprintf(buf+ret, "\n");
1336
1337 ret += sprintf(buf+ret, "Role: %s\n", self->client ?
1338 "client" : "server");
1339 ret += sprintf(buf+ret, "Open count: %d\n", self->open_count);
1340 ret += sprintf(buf+ret, "Max data size: %d\n", self->max_data_size);
1341 ret += sprintf(buf+ret, "Max header size: %d\n", self->max_header_size);
1342
1343 if (self->tty)
1344 ret += sprintf(buf+ret, "Hardware: %s\n",
1345 self->tty->hw_stopped ? "Stopped" : "Running");
1346
1347 ret += sprintf(buf+ret, "\n");
1348 return ret;
1349 }
1350
1351
1352 /*
1353 * Function ircomm_tty_read_proc (buf, start, offset, len, eof, unused)
1354 *
1355 *
1356 *
1357 */
1358 #ifdef CONFIG_PROC_FS
1359 static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
1360 int *eof, void *unused)
1361 {
1362 struct ircomm_tty_cb *self;
1363 int count = 0, l;
1364 off_t begin = 0;
1365 unsigned long flags;
1366
1367 spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1368
1369 self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1370 while ((self != NULL) && (count < 4000)) {
1371 if (self->magic != IRCOMM_TTY_MAGIC)
1372 break;
1373
1374 l = ircomm_tty_line_info(self, buf + count);
1375 count += l;
1376 if (count+begin > offset+len)
1377 goto done;
1378 if (count+begin < offset) {
1379 begin += count;
1380 count = 0;
1381 }
1382
1383 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1384 }
1385 *eof = 1;
1386 done:
1387 spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1388
1389 if (offset >= count+begin)
1390 return 0;
1391 *start = buf + (offset-begin);
1392 return ((len < begin+count-offset) ? len : begin+count-offset);
1393 }
1394 #endif /* CONFIG_PROC_FS */
1395
1396 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1397 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1398 MODULE_LICENSE("GPL");
1399 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1400
1401 module_init(ircomm_tty_init);
1402 module_exit(ircomm_tty_cleanup);
Linux kernel - Deliverables
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