blob: a41267197839304be5ad0deaa00b93f59e0713e7 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*********************************************************************
2 *
3 * Filename: irtty-sir.c
4 * Version: 2.0
5 * Description: IrDA line discipline implementation
6 * Status: Experimental.
7 * Author: Dag Brattli <dagb@cs.uit.no>
8 * Created at: Tue Dec 9 21:18:38 1997
9 * Modified at: Sun Oct 27 22:13:30 2002
10 * Modified by: Martin Diehl <mad@mdiehl.de>
11 * Sources: slip.c by Laurence Culhane, <loz@holmes.demon.co.uk>
12 * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
13 *
14 * Copyright (c) 1998-2000 Dag Brattli,
15 * Copyright (c) 2002 Martin Diehl,
16 * All Rights Reserved.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License as
20 * published by the Free Software Foundation; either version 2 of
21 * the License, or (at your option) any later version.
22 *
Jan Engelhardt96de0e22007-10-19 23:21:04 +020023 * Neither Dag Brattli nor University of Tromsø admit liability nor
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 * provide warranty for any of this software. This material is
25 * provided "AS-IS" and at no charge.
26 *
27 ********************************************************************/
28
29#include <linux/module.h>
30#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/tty.h>
33#include <linux/init.h>
34#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/delay.h>
Arjan van de Vend4ccd082006-03-20 22:32:53 -080036#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38#include <net/irda/irda.h>
39#include <net/irda/irda_device.h>
40
41#include "sir-dev.h"
42#include "irtty-sir.h"
43
44static int qos_mtt_bits = 0x03; /* 5 ms or more */
45
46module_param(qos_mtt_bits, int, 0);
47MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
48
49/* ------------------------------------------------------- */
50
51/* device configuration callbacks always invoked with irda-thread context */
52
53/* find out, how many chars we have in buffers below us
54 * this is allowed to lie, i.e. return less chars than we
55 * actually have. The returned value is used to determine
56 * how long the irdathread should wait before doing the
57 * real blocking wait_until_sent()
58 */
59
60static int irtty_chars_in_buffer(struct sir_dev *dev)
61{
62 struct sirtty_cb *priv = dev->priv;
63
64 IRDA_ASSERT(priv != NULL, return -1;);
65 IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
66
Alan Coxf34d7a52008-04-30 00:54:13 -070067 return tty_chars_in_buffer(priv->tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068}
69
70/* Wait (sleep) until underlaying hardware finished transmission
71 * i.e. hardware buffers are drained
72 * this must block and not return before all characters are really sent
73 *
74 * If the tty sits on top of a 16550A-like uart, there are typically
75 * up to 16 bytes in the fifo - f.e. 9600 bps 8N1 needs 16.7 msec
76 *
77 * With usbserial the uart-fifo is basically replaced by the converter's
78 * outgoing endpoint buffer, which can usually hold 64 bytes (at least).
79 * With pl2303 it appears we are safe with 60msec here.
80 *
81 * I really wish all serial drivers would provide
82 * correct implementation of wait_until_sent()
83 */
84
85#define USBSERIAL_TX_DONE_DELAY 60
86
87static void irtty_wait_until_sent(struct sir_dev *dev)
88{
89 struct sirtty_cb *priv = dev->priv;
90 struct tty_struct *tty;
91
92 IRDA_ASSERT(priv != NULL, return;);
93 IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
94
95 tty = priv->tty;
Alan Coxf34d7a52008-04-30 00:54:13 -070096 if (tty->ops->wait_until_sent) {
97 tty->ops->wait_until_sent(tty, msecs_to_jiffies(100));
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 }
99 else {
100 msleep(USBSERIAL_TX_DONE_DELAY);
101 }
102}
103
104/*
105 * Function irtty_change_speed (dev, speed)
106 *
107 * Change the speed of the serial port.
108 *
109 * This may sleep in set_termios (usbserial driver f.e.) and must
110 * not be called from interrupt/timer/tasklet therefore.
111 * All such invocations are deferred to kIrDAd now so we can sleep there.
112 */
113
114static int irtty_change_speed(struct sir_dev *dev, unsigned speed)
115{
116 struct sirtty_cb *priv = dev->priv;
117 struct tty_struct *tty;
Alan Cox606d0992006-12-08 02:38:45 -0800118 struct ktermios old_termios;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 int cflag;
120
121 IRDA_ASSERT(priv != NULL, return -1;);
122 IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
123
124 tty = priv->tty;
125
Alan Coxf34d7a52008-04-30 00:54:13 -0700126 mutex_lock(&tty->termios_mutex);
Alan Coxadc8d742012-07-14 15:31:47 +0100127 old_termios = tty->termios;
128 cflag = tty->termios.c_cflag;
Alan Coxf34d7a52008-04-30 00:54:13 -0700129 tty_encode_baud_rate(tty, speed, speed);
130 if (tty->ops->set_termios)
131 tty->ops->set_termios(tty, &old_termios);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 priv->io.speed = speed;
Alan Coxf34d7a52008-04-30 00:54:13 -0700133 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
135 return 0;
136}
137
138/*
139 * Function irtty_set_dtr_rts (dev, dtr, rts)
140 *
141 * This function can be used by dongles etc. to set or reset the status
142 * of the dtr and rts lines
143 */
144
145static int irtty_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
146{
147 struct sirtty_cb *priv = dev->priv;
148 int set = 0;
149 int clear = 0;
150
151 IRDA_ASSERT(priv != NULL, return -1;);
152 IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
153
154 if (rts)
155 set |= TIOCM_RTS;
156 else
157 clear |= TIOCM_RTS;
158 if (dtr)
159 set |= TIOCM_DTR;
160 else
161 clear |= TIOCM_DTR;
162
163 /*
164 * We can't use ioctl() because it expects a non-null file structure,
165 * and we don't have that here.
166 * This function is not yet defined for all tty driver, so
167 * let's be careful... Jean II
168 */
Alan Coxf34d7a52008-04-30 00:54:13 -0700169 IRDA_ASSERT(priv->tty->ops->tiocmset != NULL, return -1;);
Alan Cox20b9d172011-02-14 16:26:50 +0000170 priv->tty->ops->tiocmset(priv->tty, set, clear);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172 return 0;
173}
174
175/* ------------------------------------------------------- */
176
177/* called from sir_dev when there is more data to send
178 * context is either netdev->hard_xmit or some transmit-completion bh
179 * i.e. we are under spinlock here and must not sleep.
180 */
181
182static int irtty_do_write(struct sir_dev *dev, const unsigned char *ptr, size_t len)
183{
184 struct sirtty_cb *priv = dev->priv;
185 struct tty_struct *tty;
186 int writelen;
187
188 IRDA_ASSERT(priv != NULL, return -1;);
189 IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
190
191 tty = priv->tty;
Alan Coxf34d7a52008-04-30 00:54:13 -0700192 if (!tty->ops->write)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 return 0;
Alan Cox8a1ec212008-12-05 22:31:52 -0800194 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
Alan Coxf34d7a52008-04-30 00:54:13 -0700195 writelen = tty_write_room(tty);
196 if (writelen > len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 writelen = len;
Alan Coxf34d7a52008-04-30 00:54:13 -0700198 return tty->ops->write(tty, ptr, writelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199}
200
201/* ------------------------------------------------------- */
202
203/* irda line discipline callbacks */
204
205/*
206 * Function irtty_receive_buf( tty, cp, count)
207 *
208 * Handle the 'receiver data ready' interrupt. This function is called
209 * by the 'tty_io' module in the kernel when a block of IrDA data has
210 * been received, which can now be decapsulated and delivered for
211 * further processing
212 *
Jiri Slabyd6c53c02013-01-03 15:53:05 +0100213 * calling context depends on underlying driver and tty->port->low_latency!
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 * for example (low_latency: 1 / 0):
215 * serial.c: uart-interrupt / softint
216 * usbserial: urb-complete-interrupt / softint
217 */
218
Linus Torvalds55db4c62011-06-04 06:33:24 +0900219static void irtty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
220 char *fp, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221{
222 struct sir_dev *dev;
223 struct sirtty_cb *priv = tty->disc_data;
224 int i;
225
Linus Torvalds55db4c62011-06-04 06:33:24 +0900226 IRDA_ASSERT(priv != NULL, return;);
227 IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
229 if (unlikely(count==0)) /* yes, this happens */
Linus Torvalds55db4c62011-06-04 06:33:24 +0900230 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232 dev = priv->dev;
233 if (!dev) {
Harvey Harrisona97a6f12008-07-30 17:20:18 -0700234 IRDA_WARNING("%s(), not ready yet!\n", __func__);
Linus Torvalds55db4c62011-06-04 06:33:24 +0900235 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 }
237
238 for (i = 0; i < count; i++) {
239 /*
240 * Characters received with a parity error, etc?
241 */
242 if (fp && *fp++) {
243 IRDA_DEBUG(0, "Framing or parity error!\n");
244 sirdev_receive(dev, NULL, 0); /* notify sir_dev (updating stats) */
Linus Torvalds55db4c62011-06-04 06:33:24 +0900245 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 }
247 }
248
249 sirdev_receive(dev, cp, count);
250}
251
252/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 * Function irtty_write_wakeup (tty)
254 *
255 * Called by the driver when there's room for more data. If we have
256 * more packets to send, we send them here.
257 *
258 */
259static void irtty_write_wakeup(struct tty_struct *tty)
260{
261 struct sirtty_cb *priv = tty->disc_data;
262
263 IRDA_ASSERT(priv != NULL, return;);
264 IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
265
Alan Cox8a1ec212008-12-05 22:31:52 -0800266 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 if (priv->dev)
268 sirdev_write_complete(priv->dev);
269}
270
271/* ------------------------------------------------------- */
272
273/*
274 * Function irtty_stop_receiver (tty, stop)
275 *
276 */
277
278static inline void irtty_stop_receiver(struct tty_struct *tty, int stop)
279{
Alan Cox606d0992006-12-08 02:38:45 -0800280 struct ktermios old_termios;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 int cflag;
282
Alan Coxf34d7a52008-04-30 00:54:13 -0700283 mutex_lock(&tty->termios_mutex);
Alan Coxadc8d742012-07-14 15:31:47 +0100284 old_termios = tty->termios;
285 cflag = tty->termios.c_cflag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287 if (stop)
288 cflag &= ~CREAD;
289 else
290 cflag |= CREAD;
291
Alan Coxadc8d742012-07-14 15:31:47 +0100292 tty->termios.c_cflag = cflag;
Alan Coxf34d7a52008-04-30 00:54:13 -0700293 if (tty->ops->set_termios)
294 tty->ops->set_termios(tty, &old_termios);
295 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
298/*****************************************************************/
299
300/* serialize ldisc open/close with sir_dev */
Arjan van de Vend4ccd082006-03-20 22:32:53 -0800301static DEFINE_MUTEX(irtty_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
303/* notifier from sir_dev when irda% device gets opened (ifup) */
304
305static int irtty_start_dev(struct sir_dev *dev)
306{
307 struct sirtty_cb *priv;
308 struct tty_struct *tty;
309
310 /* serialize with ldisc open/close */
Arjan van de Vend4ccd082006-03-20 22:32:53 -0800311 mutex_lock(&irtty_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
313 priv = dev->priv;
314 if (unlikely(!priv || priv->magic!=IRTTY_MAGIC)) {
Arjan van de Vend4ccd082006-03-20 22:32:53 -0800315 mutex_unlock(&irtty_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 return -ESTALE;
317 }
318
319 tty = priv->tty;
320
Alan Coxf34d7a52008-04-30 00:54:13 -0700321 if (tty->ops->start)
322 tty->ops->start(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 /* Make sure we can receive more data */
324 irtty_stop_receiver(tty, FALSE);
325
Arjan van de Vend4ccd082006-03-20 22:32:53 -0800326 mutex_unlock(&irtty_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 return 0;
328}
329
330/* notifier from sir_dev when irda% device gets closed (ifdown) */
331
332static int irtty_stop_dev(struct sir_dev *dev)
333{
334 struct sirtty_cb *priv;
335 struct tty_struct *tty;
336
337 /* serialize with ldisc open/close */
Arjan van de Vend4ccd082006-03-20 22:32:53 -0800338 mutex_lock(&irtty_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
340 priv = dev->priv;
341 if (unlikely(!priv || priv->magic!=IRTTY_MAGIC)) {
Arjan van de Vend4ccd082006-03-20 22:32:53 -0800342 mutex_unlock(&irtty_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 return -ESTALE;
344 }
345
346 tty = priv->tty;
347
348 /* Make sure we don't receive more data */
349 irtty_stop_receiver(tty, TRUE);
Alan Coxf34d7a52008-04-30 00:54:13 -0700350 if (tty->ops->stop)
351 tty->ops->stop(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
Arjan van de Vend4ccd082006-03-20 22:32:53 -0800353 mutex_unlock(&irtty_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 return 0;
356}
357
358/* ------------------------------------------------------- */
359
360static struct sir_driver sir_tty_drv = {
361 .owner = THIS_MODULE,
362 .driver_name = "sir_tty",
363 .start_dev = irtty_start_dev,
364 .stop_dev = irtty_stop_dev,
365 .do_write = irtty_do_write,
366 .chars_in_buffer = irtty_chars_in_buffer,
367 .wait_until_sent = irtty_wait_until_sent,
368 .set_speed = irtty_change_speed,
369 .set_dtr_rts = irtty_set_dtr_rts,
370};
371
372/* ------------------------------------------------------- */
373
374/*
375 * Function irtty_ioctl (tty, file, cmd, arg)
376 *
377 * The Swiss army knife of system calls :-)
378 *
379 */
380static int irtty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
381{
382 struct irtty_info { char name[6]; } info;
383 struct sir_dev *dev;
384 struct sirtty_cb *priv = tty->disc_data;
385 int err = 0;
386
387 IRDA_ASSERT(priv != NULL, return -ENODEV;);
388 IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -EBADR;);
389
Harvey Harrisona97a6f12008-07-30 17:20:18 -0700390 IRDA_DEBUG(3, "%s(cmd=0x%X)\n", __func__, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
392 dev = priv->dev;
393 IRDA_ASSERT(dev != NULL, return -1;);
394
395 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 case IRTTY_IOCTDONGLE:
397 /* this call blocks for completion */
398 err = sirdev_set_dongle(dev, (IRDA_DONGLE) arg);
399 break;
400
401 case IRTTY_IOCGET:
402 IRDA_ASSERT(dev->netdev != NULL, return -1;);
403
404 memset(&info, 0, sizeof(info));
405 strncpy(info.name, dev->netdev->name, sizeof(info.name)-1);
406
407 if (copy_to_user((void __user *)arg, &info, sizeof(info)))
408 err = -EFAULT;
409 break;
410 default:
Alan Coxd0127532007-11-07 01:27:34 -0800411 err = tty_mode_ioctl(tty, file, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 break;
413 }
414 return err;
415}
416
417
418/*
419 * Function irtty_open(tty)
420 *
421 * This function is called by the TTY module when the IrDA line
422 * discipline is called for. Because we are sure the tty line exists,
423 * we only have to link it to a free IrDA channel.
424 */
425static int irtty_open(struct tty_struct *tty)
426{
427 struct sir_dev *dev;
428 struct sirtty_cb *priv;
429 int ret = 0;
430
431 /* Module stuff handled via irda_ldisc.owner - Jean II */
432
433 /* First make sure we're not already connected. */
434 if (tty->disc_data != NULL) {
435 priv = tty->disc_data;
436 if (priv && priv->magic == IRTTY_MAGIC) {
437 ret = -EEXIST;
438 goto out;
439 }
440 tty->disc_data = NULL; /* ### */
441 }
442
443 /* stop the underlying driver */
444 irtty_stop_receiver(tty, TRUE);
Alan Coxf34d7a52008-04-30 00:54:13 -0700445 if (tty->ops->stop)
446 tty->ops->stop(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Alan Coxf34d7a52008-04-30 00:54:13 -0700448 tty_driver_flush_buffer(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450 /* apply mtt override */
451 sir_tty_drv.qos_mtt_bits = qos_mtt_bits;
452
453 /* get a sir device instance for this driver */
454 dev = sirdev_get_instance(&sir_tty_drv, tty->name);
455 if (!dev) {
456 ret = -ENODEV;
457 goto out;
458 }
459
460 /* allocate private device info block */
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700461 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
Peter Senna Tschudin87286472012-10-05 11:33:03 +0000462 if (!priv) {
463 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 goto out_put;
Peter Senna Tschudin87286472012-10-05 11:33:03 +0000465 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
467 priv->magic = IRTTY_MAGIC;
468 priv->tty = tty;
469 priv->dev = dev;
470
471 /* serialize with start_dev - in case we were racing with ifup */
Arjan van de Vend4ccd082006-03-20 22:32:53 -0800472 mutex_lock(&irtty_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474 dev->priv = priv;
475 tty->disc_data = priv;
Alan Cox33f0f882006-01-09 20:54:13 -0800476 tty->receive_room = 65536;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
Arjan van de Vend4ccd082006-03-20 22:32:53 -0800478 mutex_unlock(&irtty_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
Harvey Harrisona97a6f12008-07-30 17:20:18 -0700480 IRDA_DEBUG(0, "%s - %s: irda line discipline opened\n", __func__, tty->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
482 return 0;
483
484out_put:
485 sirdev_put_instance(dev);
486out:
487 return ret;
488}
489
490/*
491 * Function irtty_close (tty)
492 *
493 * Close down a IrDA channel. This means flushing out any pending queues,
494 * and then restoring the TTY line discipline to what it was before it got
495 * hooked to IrDA (which usually is TTY again).
496 */
497static void irtty_close(struct tty_struct *tty)
498{
499 struct sirtty_cb *priv = tty->disc_data;
500
501 IRDA_ASSERT(priv != NULL, return;);
502 IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
503
504 /* Hm, with a dongle attached the dongle driver wants
505 * to close the dongle - which requires the use of
506 * some tty write and/or termios or ioctl operations.
507 * Are we allowed to call those when already requested
508 * to shutdown the ldisc?
509 * If not, we should somehow mark the dev being staled.
510 * Question remains, how to close the dongle in this case...
511 * For now let's assume we are granted to issue tty driver calls
512 * until we return here from the ldisc close. I'm just wondering
513 * how this behaves with hotpluggable serial hardware like
514 * rs232-pcmcia card or usb-serial...
515 *
516 * priv->tty = NULL?;
517 */
518
519 /* we are dead now */
520 tty->disc_data = NULL;
521
522 sirdev_put_instance(priv->dev);
523
524 /* Stop tty */
525 irtty_stop_receiver(tty, TRUE);
Alan Cox8a1ec212008-12-05 22:31:52 -0800526 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
Alan Coxf34d7a52008-04-30 00:54:13 -0700527 if (tty->ops->stop)
528 tty->ops->stop(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
530 kfree(priv);
531
Harvey Harrisona97a6f12008-07-30 17:20:18 -0700532 IRDA_DEBUG(0, "%s - %s: irda line discipline closed\n", __func__, tty->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533}
534
535/* ------------------------------------------------------- */
536
Alan Coxa352def2008-07-16 21:53:12 +0100537static struct tty_ldisc_ops irda_ldisc = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 .magic = TTY_LDISC_MAGIC,
539 .name = "irda",
540 .flags = 0,
541 .open = irtty_open,
542 .close = irtty_close,
543 .read = NULL,
544 .write = NULL,
545 .ioctl = irtty_ioctl,
546 .poll = NULL,
547 .receive_buf = irtty_receive_buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 .write_wakeup = irtty_write_wakeup,
549 .owner = THIS_MODULE,
550};
551
552/* ------------------------------------------------------- */
553
554static int __init irtty_sir_init(void)
555{
556 int err;
557
558 if ((err = tty_register_ldisc(N_IRDA, &irda_ldisc)) != 0)
559 IRDA_ERROR("IrDA: can't register line discipline (err = %d)\n",
560 err);
561 return err;
562}
563
564static void __exit irtty_sir_cleanup(void)
565{
566 int err;
567
Alexey Dobriyan64ccd712005-06-23 00:10:33 -0700568 if ((err = tty_unregister_ldisc(N_IRDA))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 IRDA_ERROR("%s(), can't unregister line discipline (err = %d)\n",
Harvey Harrisona97a6f12008-07-30 17:20:18 -0700570 __func__, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 }
572}
573
574module_init(irtty_sir_init);
575module_exit(irtty_sir_cleanup);
576
577MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
578MODULE_DESCRIPTION("IrDA TTY device driver");
579MODULE_ALIAS_LDISC(N_IRDA);
580MODULE_LICENSE("GPL");
581