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 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 * MA 02111-1307 USA
29 *
30 ********************************************************************/
31
32 #include <linux/config.h>
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
41 #include <asm/segment.h>
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, int from_user,
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
67 static int ircomm_tty_data_indication(void *instance, void *sap,
68 struct sk_buff *skb);
69 static int ircomm_tty_control_indication(void *instance, void *sap,
70 struct sk_buff *skb);
71 static void ircomm_tty_flow_indication(void *instance, void *sap,
72 LOCAL_FLOW cmd);
73 #ifdef CONFIG_PROC_FS
74 static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
75 int *eof, void *unused);
76 #endif /* CONFIG_PROC_FS */
77 static struct tty_driver driver;
78 static int ircomm_tty_refcount; /* If we manage several devices */
79
80 static struct tty_struct *ircomm_tty_table[NR_PTYS];
81 static struct termios *ircomm_tty_termios[NR_PTYS];
82 static struct termios *ircomm_tty_termios_locked[NR_PTYS];
83
84 hashbin_t *ircomm_tty = NULL;
85
86 /*
87 * Function ircomm_tty_init()
88 *
89 * Init IrCOMM TTY layer/driver
90 *
91 */
ircomm_tty_init(void)92 int __init ircomm_tty_init(void)
93 {
94 ircomm_tty = hashbin_new(HB_LOCAL);
95 if (ircomm_tty == NULL) {
96 ERROR("%s(), can't allocate hashbin!\n", __FUNCTION__);
97 return -ENOMEM;
98 }
99
100 memset(&driver, 0, sizeof(struct tty_driver));
101 driver.magic = TTY_DRIVER_MAGIC;
102 driver.driver_name = "ircomm";
103 #ifdef CONFIG_DEVFS_FS
104 driver.name = "ircomm%d";
105 #else
106 driver.name = "ircomm";
107 #endif
108 driver.major = IRCOMM_TTY_MAJOR;
109 driver.minor_start = IRCOMM_TTY_MINOR;
110 driver.num = IRCOMM_TTY_PORTS;
111 driver.type = TTY_DRIVER_TYPE_SERIAL;
112 driver.subtype = SERIAL_TYPE_NORMAL;
113 driver.init_termios = tty_std_termios;
114 driver.init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
115 driver.flags = TTY_DRIVER_REAL_RAW;
116 driver.refcount = &ircomm_tty_refcount;
117 driver.table = ircomm_tty_table;
118 driver.termios = ircomm_tty_termios;
119 driver.termios_locked = ircomm_tty_termios_locked;
120 driver.open = ircomm_tty_open;
121 driver.close = ircomm_tty_close;
122 driver.write = ircomm_tty_write;
123 driver.write_room = ircomm_tty_write_room;
124 driver.chars_in_buffer = ircomm_tty_chars_in_buffer;
125 driver.flush_buffer = ircomm_tty_flush_buffer;
126 driver.ioctl = ircomm_tty_ioctl;
127 driver.throttle = ircomm_tty_throttle;
128 driver.unthrottle = ircomm_tty_unthrottle;
129 driver.send_xchar = ircomm_tty_send_xchar;
130 driver.set_termios = ircomm_tty_set_termios;
131 driver.stop = ircomm_tty_stop;
132 driver.start = ircomm_tty_start;
133 driver.hangup = ircomm_tty_hangup;
134 driver.wait_until_sent = ircomm_tty_wait_until_sent;
135 #ifdef CONFIG_PROC_FS
136 driver.read_proc = ircomm_tty_read_proc;
137 #endif /* CONFIG_PROC_FS */
138 if (tty_register_driver(&driver)) {
139 ERROR("%s: Couldn't register serial driver\n", __FUNCTION__);
140 return -1;
141 }
142 return 0;
143 }
144
145 #ifdef MODULE
__ircomm_tty_cleanup(struct ircomm_tty_cb * self)146 static void __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
147 {
148 IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
149
150 ASSERT(self != NULL, return;);
151 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
152
153 ircomm_tty_shutdown(self);
154
155 self->magic = 0;
156 kfree(self);
157 }
158
159 /*
160 * Function ircomm_tty_cleanup ()
161 *
162 * Remove IrCOMM TTY layer/driver
163 *
164 */
ircomm_tty_cleanup(void)165 void ircomm_tty_cleanup(void)
166 {
167 int ret;
168
169 IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
170
171 ret = tty_unregister_driver(&driver);
172 if (ret) {
173 ERROR("%s, failed to unregister driver\n", __FUNCTION__);
174 return;
175 }
176
177 hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
178 }
179 #endif /* MODULE */
180
181 /*
182 * Function ircomm_startup (self)
183 *
184 *
185 *
186 */
ircomm_tty_startup(struct ircomm_tty_cb * self)187 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
188 {
189 notify_t notify;
190 int ret;
191
192 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
193
194 ASSERT(self != NULL, return -1;);
195 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
196
197 /* Already open */
198 if (self->flags & ASYNC_INITIALIZED) {
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(¬ify);
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 strncpy(notify.name, "ircomm_tty", NOTIFY_MAX_NAME);
215 notify.instance = self;
216
217 if (!self->ircomm) {
218 self->ircomm = ircomm_open(¬ify, self->service_type,
219 self->line);
220 }
221 if (!self->ircomm)
222 return -ENODEV;
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 ERROR("%s(), error attaching cable!\n", __FUNCTION__);
230 return ret;
231 }
232
233 self->flags |= ASYNC_INITIALIZED;
234
235 return 0;
236 }
237
238 /*
239 * Function ircomm_block_til_ready (self, filp)
240 *
241 *
242 *
243 */
ircomm_tty_block_til_ready(struct ircomm_tty_cb * self,struct file * filp)244 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
245 struct file *filp)
246 {
247 DECLARE_WAITQUEUE(wait, current);
248 int retval;
249 int do_clocal = 0, extra_count = 0;
250 unsigned long flags;
251 struct tty_struct *tty;
252
253 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
254
255 tty = self->tty;
256
257 if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
258 /* this is a callout device */
259 /* just verify that normal device is not in use */
260 if (self->flags & ASYNC_NORMAL_ACTIVE)
261 return -EBUSY;
262 if ((self->flags & ASYNC_CALLOUT_ACTIVE) &&
263 (self->flags & ASYNC_SESSION_LOCKOUT) &&
264 (self->session != current->session))
265 return -EBUSY;
266 if ((self->flags & ASYNC_CALLOUT_ACTIVE) &&
267 (self->flags & ASYNC_PGRP_LOCKOUT) &&
268 (self->pgrp != current->pgrp))
269 return -EBUSY;
270 self->flags |= ASYNC_CALLOUT_ACTIVE;
271 return 0;
272 }
273
274 /*
275 * If non-blocking mode is set, or the port is not enabled,
276 * then make the check up front and then exit.
277 */
278 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
279 /* nonblock mode is set or port is not enabled */
280 /* just verify that callout device is not active */
281 if (self->flags & ASYNC_CALLOUT_ACTIVE)
282 return -EBUSY;
283 self->flags |= ASYNC_NORMAL_ACTIVE;
284
285 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __FUNCTION__);
286 return 0;
287 }
288
289 if (self->flags & ASYNC_CALLOUT_ACTIVE) {
290 if (self->normal_termios.c_cflag & CLOCAL) {
291 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __FUNCTION__);
292 do_clocal = 1;
293 }
294 } else {
295 if (tty->termios->c_cflag & CLOCAL) {
296 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __FUNCTION__);
297 do_clocal = 1;
298 }
299 }
300
301 /* Wait for carrier detect and the line to become
302 * free (i.e., not in use by the callout). While we are in
303 * this loop, self->open_count is dropped by one, so that
304 * mgsl_close() knows when to free things. We restore it upon
305 * exit, either normal or abnormal.
306 */
307
308 retval = 0;
309 add_wait_queue(&self->open_wait, &wait);
310
311 IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
312 __FILE__,__LINE__, tty->driver.name, self->open_count );
313
314 save_flags(flags); cli();
315 if (!tty_hung_up_p(filp)) {
316 extra_count = 1;
317 self->open_count--;
318 }
319 restore_flags(flags);
320 self->blocked_open++;
321
322 while (1) {
323 if (!(self->flags & ASYNC_CALLOUT_ACTIVE) &&
324 (tty->termios->c_cflag & CBAUD)) {
325 save_flags(flags); cli();
326 self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR;
327
328 ircomm_param_request(self, IRCOMM_DTE, TRUE);
329 restore_flags(flags);
330 }
331
332 current->state = TASK_INTERRUPTIBLE;
333
334 if (tty_hung_up_p(filp) || !(self->flags & ASYNC_INITIALIZED)){
335 retval = (self->flags & ASYNC_HUP_NOTIFY) ?
336 -EAGAIN : -ERESTARTSYS;
337 break;
338 }
339
340 /*
341 * Check if link is ready now. Even if CLOCAL is
342 * specified, we cannot return before the IrCOMM link is
343 * ready
344 */
345 if (!(self->flags & ASYNC_CALLOUT_ACTIVE) &&
346 !(self->flags & ASYNC_CLOSING) &&
347 (do_clocal || (self->settings.dce & IRCOMM_CD)) &&
348 self->state == IRCOMM_TTY_READY)
349 {
350 break;
351 }
352
353 if (signal_pending(current)) {
354 retval = -ERESTARTSYS;
355 break;
356 }
357
358 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
359 __FILE__,__LINE__, tty->driver.name, self->open_count );
360
361 schedule();
362 }
363
364 __set_current_state(TASK_RUNNING);
365 remove_wait_queue(&self->open_wait, &wait);
366
367 if (extra_count)
368 self->open_count++;
369 self->blocked_open--;
370
371 IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
372 __FILE__,__LINE__, tty->driver.name, self->open_count);
373
374 if (!retval)
375 self->flags |= ASYNC_NORMAL_ACTIVE;
376
377 return retval;
378 }
379
380 /*
381 * Function ircomm_tty_open (tty, filp)
382 *
383 * This routine is called when a particular tty device is opened. This
384 * routine is mandatory; if this routine is not filled in, the attempted
385 * open will fail with ENODEV.
386 */
ircomm_tty_open(struct tty_struct * tty,struct file * filp)387 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
388 {
389 struct ircomm_tty_cb *self;
390 int line;
391 int ret;
392
393 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
394
395 MOD_INC_USE_COUNT;
396 line = MINOR(tty->device) - tty->driver.minor_start;
397 if ((line < 0) || (line >= IRCOMM_TTY_PORTS)) {
398 MOD_DEC_USE_COUNT;
399 return -ENODEV;
400 }
401
402 /* Check if instance already exists */
403 self = hashbin_find(ircomm_tty, line, NULL);
404 if (!self) {
405 /* No, so make new instance */
406 self = kmalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
407 if (self == NULL) {
408 ERROR("%s(), kmalloc failed!\n", __FUNCTION__);
409 MOD_DEC_USE_COUNT;
410 return -ENOMEM;
411 }
412 memset(self, 0, sizeof(struct ircomm_tty_cb));
413
414 self->magic = IRCOMM_TTY_MAGIC;
415 self->flow = FLOW_STOP;
416
417 self->line = line;
418 self->tqueue.routine = ircomm_tty_do_softint;
419 self->tqueue.data = self;
420 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
421 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
422 self->close_delay = 5*HZ/10;
423 self->closing_wait = 30*HZ;
424
425 /* Init some important stuff */
426 init_timer(&self->watchdog_timer);
427 init_waitqueue_head(&self->open_wait);
428 init_waitqueue_head(&self->close_wait);
429
430 /*
431 * Force TTY into raw mode by default which is usually what
432 * we want for IrCOMM and IrLPT. This way applications will
433 * not have to twiddle with printcap etc.
434 */
435 tty->termios->c_iflag = 0;
436 tty->termios->c_oflag = 0;
437
438 /* Insert into hash */
439 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
440 }
441 self->open_count++;
442
443 tty->driver_data = self;
444 self->tty = tty;
445
446 IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __FUNCTION__,
447 tty->driver.name, self->line, self->open_count);
448
449 /* Not really used by us, but lets do it anyway */
450 self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
451
452 /*
453 * If the port is the middle of closing, bail out now
454 */
455 if (tty_hung_up_p(filp) ||
456 (self->flags & ASYNC_CLOSING)) {
457 if (self->flags & ASYNC_CLOSING)
458 interruptible_sleep_on(&self->close_wait);
459 /* MOD_DEC_USE_COUNT; "info->tty" will cause this? */
460 #ifdef SERIAL_DO_RESTART
461 return ((self->flags & ASYNC_HUP_NOTIFY) ?
462 -EAGAIN : -ERESTARTSYS);
463 #else
464 return -EAGAIN;
465 #endif
466 }
467
468 /* Check if this is a "normal" ircomm device, or an irlpt device */
469 if (line < 0x10) {
470 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
471 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
472 self->settings.dce = IRCOMM_CTS | IRCOMM_CD; /* Default line settings */
473 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __FUNCTION__);
474 } else {
475 IRDA_DEBUG(2, "%s(), IrLPT device\n", __FUNCTION__);
476 self->service_type = IRCOMM_3_WIRE_RAW;
477 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
478 }
479
480 ret = ircomm_tty_startup(self);
481 if (ret)
482 return ret;
483
484 ret = ircomm_tty_block_til_ready(self, filp);
485 if (ret) {
486 /* MOD_DEC_USE_COUNT; "info->tty" will cause this? */
487 IRDA_DEBUG(2, "%s(), returning after block_til_ready with %d\n",
488 __FUNCTION__, ret);
489
490 return ret;
491 }
492
493 self->session = current->session;
494 self->pgrp = current->pgrp;
495
496 return 0;
497 }
498
499 /*
500 * Function ircomm_tty_close (tty, filp)
501 *
502 * This routine is called when a particular tty device is closed.
503 *
504 */
ircomm_tty_close(struct tty_struct * tty,struct file * filp)505 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
506 {
507 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
508 unsigned long flags;
509
510 IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
511
512 if (!tty)
513 return;
514
515 ASSERT(self != NULL, return;);
516 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
517
518 save_flags(flags);
519 cli();
520
521 if (tty_hung_up_p(filp)) {
522 MOD_DEC_USE_COUNT;
523 restore_flags(flags);
524
525 IRDA_DEBUG(0, "%s(), returning 1\n", __FUNCTION__);
526 return;
527 }
528
529 if ((tty->count == 1) && (self->open_count != 1)) {
530 /*
531 * Uh, oh. tty->count is 1, which means that the tty
532 * structure will be freed. state->count should always
533 * be one in these conditions. If it's greater than
534 * one, we've got real problems, since it means the
535 * serial port won't be shutdown.
536 */
537 IRDA_DEBUG(0, "%s(), bad serial port count; "
538 "tty->count is 1, state->count is %d\n",
539 __FUNCTION__, self->open_count);
540 self->open_count = 1;
541 }
542
543 if (--self->open_count < 0) {
544 ERROR("%s(), bad serial port count for ttys%d: %d\n",
545 __FUNCTION__, self->line, self->open_count);
546 self->open_count = 0;
547 }
548 if (self->open_count) {
549 MOD_DEC_USE_COUNT;
550 restore_flags(flags);
551
552 IRDA_DEBUG(0, "%s(), open count > 0\n", __FUNCTION__);
553 return;
554 }
555 self->flags |= ASYNC_CLOSING;
556
557 /*
558 * Now we wait for the transmit buffer to clear; and we notify
559 * the line discipline to only process XON/XOFF characters.
560 */
561 tty->closing = 1;
562 if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
563 tty_wait_until_sent(tty, self->closing_wait);
564
565 ircomm_tty_shutdown(self);
566
567 if (tty->driver.flush_buffer)
568 tty->driver.flush_buffer(tty);
569 tty_ldisc_flush(tty);
570
571 tty->closing = 0;
572 self->tty = 0;
573
574 if (self->blocked_open) {
575 if (self->close_delay) {
576 current->state = TASK_INTERRUPTIBLE;
577 schedule_timeout(self->close_delay);
578 }
579 wake_up_interruptible(&self->open_wait);
580 }
581
582 self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
583 ASYNC_CLOSING);
584 wake_up_interruptible(&self->close_wait);
585
586 MOD_DEC_USE_COUNT;
587 restore_flags(flags);
588 }
589
590 /*
591 * Function ircomm_tty_flush_buffer (tty)
592 *
593 *
594 *
595 */
ircomm_tty_flush_buffer(struct tty_struct * tty)596 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
597 {
598 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
599
600 ASSERT(self != NULL, return;);
601 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
602
603 /*
604 * Let do_softint() do this to avoid race condition with
605 * do_softint() ;-)
606 */
607 queue_task(&self->tqueue, &tq_immediate);
608 mark_bh(IMMEDIATE_BH);
609 }
610
611 /*
612 * Function ircomm_tty_do_softint (private_)
613 *
614 * We use this routine to give the write wakeup to the user at at a
615 * safe time (as fast as possible after write have completed). This
616 * can be compared to the Tx interrupt.
617 */
ircomm_tty_do_softint(void * private_)618 static void ircomm_tty_do_softint(void *private_)
619 {
620 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) private_;
621 struct tty_struct *tty;
622 unsigned long flags;
623 struct sk_buff *skb, *ctrl_skb;
624
625 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
626
627 if (!self || self->magic != IRCOMM_TTY_MAGIC)
628 return;
629
630 tty = self->tty;
631 if (!tty)
632 return;
633
634 /* Unlink control buffer */
635 save_flags(flags);
636 cli();
637
638 ctrl_skb = self->ctrl_skb;
639 self->ctrl_skb = NULL;
640
641 restore_flags(flags);
642
643 /* Flush control buffer if any */
644 if (ctrl_skb && self->flow == FLOW_START)
645 ircomm_control_request(self->ircomm, ctrl_skb);
646
647 if (tty->hw_stopped)
648 return;
649
650 /* Unlink transmit buffer */
651 save_flags(flags);
652 cli();
653
654 skb = self->tx_skb;
655 self->tx_skb = NULL;
656
657 restore_flags(flags);
658
659 /* Flush transmit buffer if any */
660 if (skb)
661 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
662
663 /* Check if user (still) wants to be waken up */
664 tty_wakeup(tty);
665 }
666
667 /*
668 * Function ircomm_tty_write (tty, from_user, buf, count)
669 *
670 * This routine is called by the kernel to write a series of characters
671 * to the tty device. The characters may come from user space or kernel
672 * space. This routine will return the number of characters actually
673 * accepted for writing. This routine is mandatory.
674 */
ircomm_tty_write(struct tty_struct * tty,int from_user,const unsigned char * buf,int count)675 static int ircomm_tty_write(struct tty_struct *tty, int from_user,
676 const unsigned char *buf, int count)
677 {
678 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
679 unsigned long flags;
680 struct sk_buff *skb;
681 int tailroom = 0;
682 int len = 0;
683 int size;
684
685 IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n",
686 __FUNCTION__, count, tty->hw_stopped);
687
688 ASSERT(self != NULL, return -1;);
689 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
690
691 /* We may receive packets from the TTY even before we have finished
692 * our setup. Not cool.
693 * The problem is that we don't know the final header and data size
694 * to create the proper skb, so any skb we would create would have
695 * bogus header and data size, so need care.
696 * We use a bogus header size to safely detect this condition.
697 * Another problem is that hw_stopped was set to 0 way before it
698 * should be, so we would drop this skb. It should now be fixed.
699 * One option is to not accept data until we are properly setup.
700 * But, I suspect that when it happens, the ppp line discipline
701 * just "drops" the data, which might screw up connect scripts.
702 * The second option is to create a "safe skb", with large header
703 * and small size (see ircomm_tty_open() for values).
704 * We just need to make sure that when the real values get filled,
705 * we don't mess up the original "safe skb" (see tx_data_size).
706 * Jean II */
707 if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
708 IRDA_DEBUG(1, "%s() : not initialised\n", __FUNCTION__);
709 #ifdef IRCOMM_NO_TX_BEFORE_INIT
710 /* We didn't consume anything, TTY will retry */
711 return 0;
712 #endif
713 }
714
715 save_flags(flags);
716 cli();
717
718 /* Fetch current transmit buffer */
719 skb = self->tx_skb;
720
721 /*
722 * Send out all the data we get, possibly as multiple fragmented
723 * frames, but this will only happen if the data is larger than the
724 * max data size. The normal case however is just the opposite, and
725 * this function may be called multiple times, and will then actually
726 * defragment the data and send it out as one packet as soon as
727 * possible, but at a safer point in time
728 */
729 while (count) {
730 size = count;
731
732 /* Adjust data size to the max data size */
733 if (size > self->max_data_size)
734 size = self->max_data_size;
735
736 /*
737 * Do we already have a buffer ready for transmit, or do
738 * we need to allocate a new frame
739 */
740 if (skb) {
741 /*
742 * Any room for more data at the end of the current
743 * transmit buffer? Cannot use skb_tailroom, since
744 * dev_alloc_skb gives us a larger skb than we
745 * requested
746 * Note : use tx_data_size, because max_data_size
747 * may have changed and we don't want to overwrite
748 * the skb. - Jean II
749 */
750 if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
751 /* Adjust data to tailroom */
752 if (size > tailroom)
753 size = tailroom;
754 } else {
755 /*
756 * Current transmit frame is full, so break
757 * out, so we can send it as soon as possible
758 */
759 break;
760 }
761 } else {
762 /* Prepare a full sized frame */
763 skb = dev_alloc_skb(self->max_data_size+
764 self->max_header_size);
765 if (!skb) {
766 restore_flags(flags);
767 return -ENOBUFS;
768 }
769 skb_reserve(skb, self->max_header_size);
770 self->tx_skb = skb;
771 /* Remember skb size because max_data_size may
772 * change later on - Jean II */
773 self->tx_data_size = self->max_data_size;
774 }
775
776 /* Copy data */
777 if (from_user)
778 copy_from_user(skb_put(skb,size), buf+len, size);
779 else
780 memcpy(skb_put(skb,size), buf+len, size);
781
782 count -= size;
783 len += size;
784 }
785
786 restore_flags(flags);
787
788 /*
789 * Schedule a new thread which will transmit the frame as soon
790 * as possible, but at a safe point in time. We do this so the
791 * "user" can give us data multiple times, as PPP does (because of
792 * its 256 byte tx buffer). We will then defragment and send out
793 * all this data as one single packet.
794 */
795 queue_task(&self->tqueue, &tq_immediate);
796 mark_bh(IMMEDIATE_BH);
797
798 return len;
799 }
800
801 /*
802 * Function ircomm_tty_write_room (tty)
803 *
804 * This routine returns the numbers of characters the tty driver will
805 * accept for queuing to be written. This number is subject to change as
806 * output buffers get emptied, or if the output flow control is acted.
807 */
ircomm_tty_write_room(struct tty_struct * tty)808 static int ircomm_tty_write_room(struct tty_struct *tty)
809 {
810 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
811 unsigned long flags;
812 int ret;
813
814 ASSERT(self != NULL, return -1;);
815 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
816
817 #ifdef IRCOMM_NO_TX_BEFORE_INIT
818 /* max_header_size tells us if the channel is initialised or not. */
819 if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
820 /* Don't bother us yet */
821 return 0;
822 #endif
823
824 /* Check if we are allowed to transmit any data.
825 * hw_stopped is the regular flow control.
826 * Jean II */
827 if (tty->hw_stopped)
828 ret = 0;
829 else {
830 save_flags(flags);
831 cli();
832 if (self->tx_skb)
833 ret = self->tx_data_size - self->tx_skb->len;
834 else
835 ret = self->max_data_size;
836 restore_flags(flags);
837 }
838 IRDA_DEBUG(2, "%s(), ret=%d\n", __FUNCTION__, ret);
839
840 return ret;
841 }
842
843 /*
844 * Function ircomm_tty_wait_until_sent (tty, timeout)
845 *
846 * This routine waits until the device has written out all of the
847 * characters in its transmitter FIFO.
848 */
ircomm_tty_wait_until_sent(struct tty_struct * tty,int timeout)849 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
850 {
851 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
852 unsigned long orig_jiffies, poll_time;
853
854 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
855
856 ASSERT(self != NULL, return;);
857 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
858
859 orig_jiffies = jiffies;
860
861 /* Set poll time to 200 ms */
862 poll_time = IRDA_MIN(timeout, MSECS_TO_JIFFIES(200));
863
864 while (self->tx_skb && self->tx_skb->len) {
865 current->state = TASK_INTERRUPTIBLE;
866 schedule_timeout(poll_time);
867 if (signal_pending(current))
868 break;
869 if (timeout && time_after(jiffies, orig_jiffies + timeout))
870 break;
871 }
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 */
ircomm_tty_throttle(struct tty_struct * tty)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 ASSERT(self != NULL, return;);
889 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 */
ircomm_tty_unthrottle(struct tty_struct * tty)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 ASSERT(self != NULL, return;);
920 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 */
ircomm_tty_chars_in_buffer(struct tty_struct * tty)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 ASSERT(self != NULL, return -1;);
950 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
951
952 save_flags(flags);
953 cli();
954
955 if (self->tx_skb)
956 len = self->tx_skb->len;
957
958 restore_flags(flags);
959
960 return len;
961 }
962
ircomm_tty_shutdown(struct ircomm_tty_cb * self)963 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
964 {
965 unsigned long flags;
966
967 ASSERT(self != NULL, return;);
968 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
969
970 IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
971
972 if (!(self->flags & ASYNC_INITIALIZED))
973 return;
974
975 save_flags(flags);
976 cli();
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 ircomm_tty_detach_cable(self);
993
994 if (self->ircomm) {
995 ircomm_close(self->ircomm);
996 self->ircomm = NULL;
997 }
998 self->flags &= ~ASYNC_INITIALIZED;
999
1000 restore_flags(flags);
1001 }
1002
1003 /*
1004 * Function ircomm_tty_hangup (tty)
1005 *
1006 * This routine notifies the tty driver that it should hangup the tty
1007 * device.
1008 *
1009 */
ircomm_tty_hangup(struct tty_struct * tty)1010 static void ircomm_tty_hangup(struct tty_struct *tty)
1011 {
1012 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1013
1014 IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
1015
1016 ASSERT(self != NULL, return;);
1017 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1018
1019 if (!tty)
1020 return;
1021
1022 /* ircomm_tty_flush_buffer(tty); */
1023 ircomm_tty_shutdown(self);
1024
1025 self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
1026 self->tty = 0;
1027 self->open_count = 0;
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 */
ircomm_tty_send_xchar(struct tty_struct * tty,char ch)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 */
ircomm_tty_start(struct tty_struct * tty)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 */
ircomm_tty_stop(struct tty_struct * tty)1061 void ircomm_tty_stop(struct tty_struct *tty)
1062 {
1063 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1064
1065 ASSERT(self != NULL, return;);
1066 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 */
ircomm_tty_check_modem_status(struct ircomm_tty_cb * self)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 ASSERT(self != NULL, return;);
1086 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, "%s(), ircomm%d CD now %s...\n",
1097 __FUNCTION__, self->line, (status & IRCOMM_CD) ? "on" : "off");
1098
1099 if (status & IRCOMM_CD) {
1100 wake_up_interruptible(&self->open_wait);
1101 } else if (!((self->flags & ASYNC_CALLOUT_ACTIVE) &&
1102 (self->flags & ASYNC_CALLOUT_NOHUP)))
1103 {
1104 IRDA_DEBUG(2, "%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, "%s(), CTS tx start...\n", __FUNCTION__);
1116 tty->hw_stopped = 0;
1117
1118 /* Wake up processes blocked on open */
1119 wake_up_interruptible(&self->open_wait);
1120
1121 queue_task(&self->tqueue, &tq_immediate);
1122 mark_bh(IMMEDIATE_BH);
1123 return;
1124 }
1125 } else {
1126 if (!(status & IRCOMM_CTS)) {
1127 IRDA_DEBUG(2, "%s(), CTS tx stop...\n", __FUNCTION__);
1128 tty->hw_stopped = 1;
1129 }
1130 }
1131 }
1132 }
1133
1134 /*
1135 * Function ircomm_tty_data_indication (instance, sap, skb)
1136 *
1137 * Handle incoming data, and deliver it to the line discipline
1138 *
1139 */
ircomm_tty_data_indication(void * instance,void * sap,struct sk_buff * skb)1140 static int ircomm_tty_data_indication(void *instance, void *sap,
1141 struct sk_buff *skb)
1142 {
1143 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1144
1145 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
1146
1147 ASSERT(self != NULL, return -1;);
1148 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1149 ASSERT(skb != NULL, return -1;);
1150
1151 if (!self->tty) {
1152 IRDA_DEBUG(0, "%s(), no tty!\n", __FUNCTION__);
1153 dev_kfree_skb(skb);
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 dev_kfree_skb(skb);
1179
1180 return 0;
1181 }
1182
1183 /*
1184 * Function ircomm_tty_control_indication (instance, sap, skb)
1185 *
1186 * Parse all incoming parameters (easy!)
1187 *
1188 */
ircomm_tty_control_indication(void * instance,void * sap,struct sk_buff * skb)1189 static int ircomm_tty_control_indication(void *instance, void *sap,
1190 struct sk_buff *skb)
1191 {
1192 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1193 int clen;
1194
1195 IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
1196
1197 ASSERT(self != NULL, return -1;);
1198 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1199 ASSERT(skb != NULL, return -1;);
1200
1201 clen = skb->data[0];
1202
1203 irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1204 &ircomm_param_info);
1205 dev_kfree_skb(skb);
1206
1207 return 0;
1208 }
1209
1210 /*
1211 * Function ircomm_tty_flow_indication (instance, sap, cmd)
1212 *
1213 * This function is called by IrTTP when it wants us to slow down the
1214 * transmission of data. We just mark the hardware as stopped, and wait
1215 * for IrTTP to notify us that things are OK again.
1216 */
ircomm_tty_flow_indication(void * instance,void * sap,LOCAL_FLOW cmd)1217 static void ircomm_tty_flow_indication(void *instance, void *sap,
1218 LOCAL_FLOW cmd)
1219 {
1220 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1221 struct tty_struct *tty;
1222
1223 ASSERT(self != NULL, return;);
1224 ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1225
1226 tty = self->tty;
1227
1228 switch (cmd) {
1229 case FLOW_START:
1230 IRDA_DEBUG(2, "%s(), hw start!\n", __FUNCTION__);
1231 tty->hw_stopped = 0;
1232
1233 /* ircomm_tty_do_softint will take care of the rest */
1234 queue_task(&self->tqueue, &tq_immediate);
1235 mark_bh(IMMEDIATE_BH);
1236 break;
1237 default: /* If we get here, something is very wrong, better stop */
1238 case FLOW_STOP:
1239 IRDA_DEBUG(2, "%s(), hw stopped!\n", __FUNCTION__);
1240 tty->hw_stopped = 1;
1241 break;
1242 }
1243 self->flow = cmd;
1244 }
1245
ircomm_tty_line_info(struct ircomm_tty_cb * self,char * buf)1246 static int ircomm_tty_line_info(struct ircomm_tty_cb *self, char *buf)
1247 {
1248 int ret=0;
1249
1250 ret += sprintf(buf+ret, "State: %s\n", ircomm_tty_state[self->state]);
1251
1252 ret += sprintf(buf+ret, "Service type: ");
1253 if (self->service_type & IRCOMM_9_WIRE)
1254 ret += sprintf(buf+ret, "9_WIRE");
1255 else if (self->service_type & IRCOMM_3_WIRE)
1256 ret += sprintf(buf+ret, "3_WIRE");
1257 else if (self->service_type & IRCOMM_3_WIRE_RAW)
1258 ret += sprintf(buf+ret, "3_WIRE_RAW");
1259 else
1260 ret += sprintf(buf+ret, "No common service type!\n");
1261 ret += sprintf(buf+ret, "\n");
1262
1263 ret += sprintf(buf+ret, "Port name: %s\n", self->settings.port_name);
1264
1265 ret += sprintf(buf+ret, "DTE status: ");
1266 if (self->settings.dte & IRCOMM_RTS)
1267 ret += sprintf(buf+ret, "RTS|");
1268 if (self->settings.dte & IRCOMM_DTR)
1269 ret += sprintf(buf+ret, "DTR|");
1270 if (self->settings.dte)
1271 ret--; /* remove the last | */
1272 ret += sprintf(buf+ret, "\n");
1273
1274 ret += sprintf(buf+ret, "DCE status: ");
1275 if (self->settings.dce & IRCOMM_CTS)
1276 ret += sprintf(buf+ret, "CTS|");
1277 if (self->settings.dce & IRCOMM_DSR)
1278 ret += sprintf(buf+ret, "DSR|");
1279 if (self->settings.dce & IRCOMM_CD)
1280 ret += sprintf(buf+ret, "CD|");
1281 if (self->settings.dce & IRCOMM_RI)
1282 ret += sprintf(buf+ret, "RI|");
1283 if (self->settings.dce)
1284 ret--; /* remove the last | */
1285 ret += sprintf(buf+ret, "\n");
1286
1287 ret += sprintf(buf+ret, "Configuration: ");
1288 if (!self->settings.null_modem)
1289 ret += sprintf(buf+ret, "DTE <-> DCE\n");
1290 else
1291 ret += sprintf(buf+ret,
1292 "DTE <-> DTE (null modem emulation)\n");
1293
1294 ret += sprintf(buf+ret, "Data rate: %d\n", self->settings.data_rate);
1295
1296 ret += sprintf(buf+ret, "Flow control: ");
1297 if (self->settings.flow_control & IRCOMM_XON_XOFF_IN)
1298 ret += sprintf(buf+ret, "XON_XOFF_IN|");
1299 if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT)
1300 ret += sprintf(buf+ret, "XON_XOFF_OUT|");
1301 if (self->settings.flow_control & IRCOMM_RTS_CTS_IN)
1302 ret += sprintf(buf+ret, "RTS_CTS_IN|");
1303 if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT)
1304 ret += sprintf(buf+ret, "RTS_CTS_OUT|");
1305 if (self->settings.flow_control & IRCOMM_DSR_DTR_IN)
1306 ret += sprintf(buf+ret, "DSR_DTR_IN|");
1307 if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT)
1308 ret += sprintf(buf+ret, "DSR_DTR_OUT|");
1309 if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN)
1310 ret += sprintf(buf+ret, "ENQ_ACK_IN|");
1311 if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT)
1312 ret += sprintf(buf+ret, "ENQ_ACK_OUT|");
1313 if (self->settings.flow_control)
1314 ret--; /* remove the last | */
1315 ret += sprintf(buf+ret, "\n");
1316
1317 ret += sprintf(buf+ret, "Flags: ");
1318 if (self->flags & ASYNC_CTS_FLOW)
1319 ret += sprintf(buf+ret, "ASYNC_CTS_FLOW|");
1320 if (self->flags & ASYNC_CHECK_CD)
1321 ret += sprintf(buf+ret, "ASYNC_CHECK_CD|");
1322 if (self->flags & ASYNC_INITIALIZED)
1323 ret += sprintf(buf+ret, "ASYNC_INITIALIZED|");
1324 if (self->flags & ASYNC_LOW_LATENCY)
1325 ret += sprintf(buf+ret, "ASYNC_LOW_LATENCY|");
1326 if (self->flags & ASYNC_CLOSING)
1327 ret += sprintf(buf+ret, "ASYNC_CLOSING|");
1328 if (self->flags & ASYNC_NORMAL_ACTIVE)
1329 ret += sprintf(buf+ret, "ASYNC_NORMAL_ACTIVE|");
1330 if (self->flags & ASYNC_CALLOUT_ACTIVE)
1331 ret += sprintf(buf+ret, "ASYNC_CALLOUT_ACTIVE|");
1332 if (self->flags)
1333 ret--; /* remove the last | */
1334 ret += sprintf(buf+ret, "\n");
1335
1336 ret += sprintf(buf+ret, "Role: %s\n", self->client ?
1337 "client" : "server");
1338 ret += sprintf(buf+ret, "Open count: %d\n", self->open_count);
1339 ret += sprintf(buf+ret, "Max data size: %d\n", self->max_data_size);
1340 ret += sprintf(buf+ret, "Max header size: %d\n", self->max_header_size);
1341
1342 if (self->tty)
1343 ret += sprintf(buf+ret, "Hardware: %s\n",
1344 self->tty->hw_stopped ? "Stopped" : "Running");
1345
1346 ret += sprintf(buf+ret, "\n");
1347 return ret;
1348 }
1349
1350
1351 /*
1352 * Function ircomm_tty_read_proc (buf, start, offset, len, eof, unused)
1353 *
1354 *
1355 *
1356 */
1357 #ifdef CONFIG_PROC_FS
ircomm_tty_read_proc(char * buf,char ** start,off_t offset,int len,int * eof,void * unused)1358 static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
1359 int *eof, void *unused)
1360 {
1361 struct ircomm_tty_cb *self;
1362 int count = 0, l;
1363 off_t begin = 0;
1364
1365 self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1366 while ((self != NULL) && (count < 4000)) {
1367 if (self->magic != IRCOMM_TTY_MAGIC)
1368 return 0;
1369
1370 l = ircomm_tty_line_info(self, buf + count);
1371 count += l;
1372 if (count+begin > offset+len)
1373 goto done;
1374 if (count+begin < offset) {
1375 begin += count;
1376 count = 0;
1377 }
1378
1379 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1380 }
1381 *eof = 1;
1382 done:
1383 if (offset >= count+begin)
1384 return 0;
1385 *start = buf + (offset-begin);
1386 return ((len < begin+count-offset) ? len : begin+count-offset);
1387 }
1388 #endif /* CONFIG_PROC_FS */
1389
1390 #ifdef MODULE
1391 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1392 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1393 MODULE_LICENSE("GPL");
1394
init_module(void)1395 int init_module(void)
1396 {
1397 return ircomm_tty_init();
1398 }
1399
cleanup_module(void)1400 void cleanup_module(void)
1401 {
1402 ircomm_tty_cleanup();
1403 }
1404
1405 #endif /* MODULE */
1406
1407
1408
1409
1410