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1da177e4 LT |
1 | /********************************************************************* |
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 | * | |
96de0e25 | 23 | * Neither Dag Brattli nor University of Tromsø admit liability nor |
1da177e4 LT |
24 | * 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> | |
31 | #include <linux/tty.h> | |
32 | #include <linux/init.h> | |
33 | #include <asm/uaccess.h> | |
1da177e4 | 34 | #include <linux/delay.h> |
d4ccd08c | 35 | #include <linux/mutex.h> |
1da177e4 LT |
36 | |
37 | #include <net/irda/irda.h> | |
38 | #include <net/irda/irda_device.h> | |
39 | ||
40 | #include "sir-dev.h" | |
41 | #include "irtty-sir.h" | |
42 | ||
43 | static int qos_mtt_bits = 0x03; /* 5 ms or more */ | |
44 | ||
45 | module_param(qos_mtt_bits, int, 0); | |
46 | MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time"); | |
47 | ||
48 | /* ------------------------------------------------------- */ | |
49 | ||
50 | /* device configuration callbacks always invoked with irda-thread context */ | |
51 | ||
52 | /* find out, how many chars we have in buffers below us | |
53 | * this is allowed to lie, i.e. return less chars than we | |
54 | * actually have. The returned value is used to determine | |
55 | * how long the irdathread should wait before doing the | |
56 | * real blocking wait_until_sent() | |
57 | */ | |
58 | ||
59 | static int irtty_chars_in_buffer(struct sir_dev *dev) | |
60 | { | |
61 | struct sirtty_cb *priv = dev->priv; | |
62 | ||
63 | IRDA_ASSERT(priv != NULL, return -1;); | |
64 | IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;); | |
65 | ||
f34d7a5b | 66 | return tty_chars_in_buffer(priv->tty); |
1da177e4 LT |
67 | } |
68 | ||
69 | /* Wait (sleep) until underlaying hardware finished transmission | |
70 | * i.e. hardware buffers are drained | |
71 | * this must block and not return before all characters are really sent | |
72 | * | |
73 | * If the tty sits on top of a 16550A-like uart, there are typically | |
74 | * up to 16 bytes in the fifo - f.e. 9600 bps 8N1 needs 16.7 msec | |
75 | * | |
76 | * With usbserial the uart-fifo is basically replaced by the converter's | |
77 | * outgoing endpoint buffer, which can usually hold 64 bytes (at least). | |
78 | * With pl2303 it appears we are safe with 60msec here. | |
79 | * | |
80 | * I really wish all serial drivers would provide | |
81 | * correct implementation of wait_until_sent() | |
82 | */ | |
83 | ||
84 | #define USBSERIAL_TX_DONE_DELAY 60 | |
85 | ||
86 | static void irtty_wait_until_sent(struct sir_dev *dev) | |
87 | { | |
88 | struct sirtty_cb *priv = dev->priv; | |
89 | struct tty_struct *tty; | |
90 | ||
91 | IRDA_ASSERT(priv != NULL, return;); | |
92 | IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;); | |
93 | ||
94 | tty = priv->tty; | |
f34d7a5b AC |
95 | if (tty->ops->wait_until_sent) { |
96 | tty->ops->wait_until_sent(tty, msecs_to_jiffies(100)); | |
1da177e4 LT |
97 | } |
98 | else { | |
99 | msleep(USBSERIAL_TX_DONE_DELAY); | |
100 | } | |
101 | } | |
102 | ||
103 | /* | |
104 | * Function irtty_change_speed (dev, speed) | |
105 | * | |
106 | * Change the speed of the serial port. | |
107 | * | |
108 | * This may sleep in set_termios (usbserial driver f.e.) and must | |
109 | * not be called from interrupt/timer/tasklet therefore. | |
110 | * All such invocations are deferred to kIrDAd now so we can sleep there. | |
111 | */ | |
112 | ||
113 | static int irtty_change_speed(struct sir_dev *dev, unsigned speed) | |
114 | { | |
115 | struct sirtty_cb *priv = dev->priv; | |
116 | struct tty_struct *tty; | |
606d099c | 117 | struct ktermios old_termios; |
1da177e4 LT |
118 | int cflag; |
119 | ||
120 | IRDA_ASSERT(priv != NULL, return -1;); | |
121 | IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;); | |
122 | ||
123 | tty = priv->tty; | |
124 | ||
f34d7a5b | 125 | mutex_lock(&tty->termios_mutex); |
1da177e4 LT |
126 | old_termios = *(tty->termios); |
127 | cflag = tty->termios->c_cflag; | |
f34d7a5b AC |
128 | tty_encode_baud_rate(tty, speed, speed); |
129 | if (tty->ops->set_termios) | |
130 | tty->ops->set_termios(tty, &old_termios); | |
1da177e4 | 131 | priv->io.speed = speed; |
f34d7a5b | 132 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
133 | |
134 | return 0; | |
135 | } | |
136 | ||
137 | /* | |
138 | * Function irtty_set_dtr_rts (dev, dtr, rts) | |
139 | * | |
140 | * This function can be used by dongles etc. to set or reset the status | |
141 | * of the dtr and rts lines | |
142 | */ | |
143 | ||
144 | static int irtty_set_dtr_rts(struct sir_dev *dev, int dtr, int rts) | |
145 | { | |
146 | struct sirtty_cb *priv = dev->priv; | |
147 | int set = 0; | |
148 | int clear = 0; | |
149 | ||
150 | IRDA_ASSERT(priv != NULL, return -1;); | |
151 | IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;); | |
152 | ||
153 | if (rts) | |
154 | set |= TIOCM_RTS; | |
155 | else | |
156 | clear |= TIOCM_RTS; | |
157 | if (dtr) | |
158 | set |= TIOCM_DTR; | |
159 | else | |
160 | clear |= TIOCM_DTR; | |
161 | ||
162 | /* | |
163 | * We can't use ioctl() because it expects a non-null file structure, | |
164 | * and we don't have that here. | |
165 | * This function is not yet defined for all tty driver, so | |
166 | * let's be careful... Jean II | |
167 | */ | |
f34d7a5b AC |
168 | IRDA_ASSERT(priv->tty->ops->tiocmset != NULL, return -1;); |
169 | priv->tty->ops->tiocmset(priv->tty, NULL, set, clear); | |
1da177e4 LT |
170 | |
171 | return 0; | |
172 | } | |
173 | ||
174 | /* ------------------------------------------------------- */ | |
175 | ||
176 | /* called from sir_dev when there is more data to send | |
177 | * context is either netdev->hard_xmit or some transmit-completion bh | |
178 | * i.e. we are under spinlock here and must not sleep. | |
179 | */ | |
180 | ||
181 | static int irtty_do_write(struct sir_dev *dev, const unsigned char *ptr, size_t len) | |
182 | { | |
183 | struct sirtty_cb *priv = dev->priv; | |
184 | struct tty_struct *tty; | |
185 | int writelen; | |
186 | ||
187 | IRDA_ASSERT(priv != NULL, return -1;); | |
188 | IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;); | |
189 | ||
190 | tty = priv->tty; | |
f34d7a5b | 191 | if (!tty->ops->write) |
1da177e4 | 192 | return 0; |
8a1ec21e | 193 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
f34d7a5b AC |
194 | writelen = tty_write_room(tty); |
195 | if (writelen > len) | |
1da177e4 | 196 | writelen = len; |
f34d7a5b | 197 | return tty->ops->write(tty, ptr, writelen); |
1da177e4 LT |
198 | } |
199 | ||
200 | /* ------------------------------------------------------- */ | |
201 | ||
202 | /* irda line discipline callbacks */ | |
203 | ||
204 | /* | |
205 | * Function irtty_receive_buf( tty, cp, count) | |
206 | * | |
207 | * Handle the 'receiver data ready' interrupt. This function is called | |
208 | * by the 'tty_io' module in the kernel when a block of IrDA data has | |
209 | * been received, which can now be decapsulated and delivered for | |
210 | * further processing | |
211 | * | |
212 | * calling context depends on underlying driver and tty->low_latency! | |
213 | * for example (low_latency: 1 / 0): | |
214 | * serial.c: uart-interrupt / softint | |
215 | * usbserial: urb-complete-interrupt / softint | |
216 | */ | |
217 | ||
218 | static void irtty_receive_buf(struct tty_struct *tty, const unsigned char *cp, | |
219 | char *fp, int count) | |
220 | { | |
221 | struct sir_dev *dev; | |
222 | struct sirtty_cb *priv = tty->disc_data; | |
223 | int i; | |
224 | ||
225 | IRDA_ASSERT(priv != NULL, return;); | |
226 | IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;); | |
227 | ||
228 | if (unlikely(count==0)) /* yes, this happens */ | |
229 | return; | |
230 | ||
231 | dev = priv->dev; | |
232 | if (!dev) { | |
a97a6f10 | 233 | IRDA_WARNING("%s(), not ready yet!\n", __func__); |
1da177e4 LT |
234 | return; |
235 | } | |
236 | ||
237 | for (i = 0; i < count; i++) { | |
238 | /* | |
239 | * Characters received with a parity error, etc? | |
240 | */ | |
241 | if (fp && *fp++) { | |
242 | IRDA_DEBUG(0, "Framing or parity error!\n"); | |
243 | sirdev_receive(dev, NULL, 0); /* notify sir_dev (updating stats) */ | |
244 | return; | |
245 | } | |
246 | } | |
247 | ||
248 | sirdev_receive(dev, cp, count); | |
249 | } | |
250 | ||
1da177e4 LT |
251 | /* |
252 | * Function irtty_write_wakeup (tty) | |
253 | * | |
254 | * Called by the driver when there's room for more data. If we have | |
255 | * more packets to send, we send them here. | |
256 | * | |
257 | */ | |
258 | static void irtty_write_wakeup(struct tty_struct *tty) | |
259 | { | |
260 | struct sirtty_cb *priv = tty->disc_data; | |
261 | ||
262 | IRDA_ASSERT(priv != NULL, return;); | |
263 | IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;); | |
264 | ||
8a1ec21e | 265 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
1da177e4 LT |
266 | if (priv->dev) |
267 | sirdev_write_complete(priv->dev); | |
268 | } | |
269 | ||
270 | /* ------------------------------------------------------- */ | |
271 | ||
272 | /* | |
273 | * Function irtty_stop_receiver (tty, stop) | |
274 | * | |
275 | */ | |
276 | ||
277 | static inline void irtty_stop_receiver(struct tty_struct *tty, int stop) | |
278 | { | |
606d099c | 279 | struct ktermios old_termios; |
1da177e4 LT |
280 | int cflag; |
281 | ||
f34d7a5b | 282 | mutex_lock(&tty->termios_mutex); |
1da177e4 LT |
283 | old_termios = *(tty->termios); |
284 | cflag = tty->termios->c_cflag; | |
285 | ||
286 | if (stop) | |
287 | cflag &= ~CREAD; | |
288 | else | |
289 | cflag |= CREAD; | |
290 | ||
291 | tty->termios->c_cflag = cflag; | |
f34d7a5b AC |
292 | if (tty->ops->set_termios) |
293 | tty->ops->set_termios(tty, &old_termios); | |
294 | mutex_unlock(&tty->termios_mutex); | |
1da177e4 LT |
295 | } |
296 | ||
297 | /*****************************************************************/ | |
298 | ||
299 | /* serialize ldisc open/close with sir_dev */ | |
d4ccd08c | 300 | static DEFINE_MUTEX(irtty_mutex); |
1da177e4 LT |
301 | |
302 | /* notifier from sir_dev when irda% device gets opened (ifup) */ | |
303 | ||
304 | static int irtty_start_dev(struct sir_dev *dev) | |
305 | { | |
306 | struct sirtty_cb *priv; | |
307 | struct tty_struct *tty; | |
308 | ||
309 | /* serialize with ldisc open/close */ | |
d4ccd08c | 310 | mutex_lock(&irtty_mutex); |
1da177e4 LT |
311 | |
312 | priv = dev->priv; | |
313 | if (unlikely(!priv || priv->magic!=IRTTY_MAGIC)) { | |
d4ccd08c | 314 | mutex_unlock(&irtty_mutex); |
1da177e4 LT |
315 | return -ESTALE; |
316 | } | |
317 | ||
318 | tty = priv->tty; | |
319 | ||
f34d7a5b AC |
320 | if (tty->ops->start) |
321 | tty->ops->start(tty); | |
1da177e4 LT |
322 | /* Make sure we can receive more data */ |
323 | irtty_stop_receiver(tty, FALSE); | |
324 | ||
d4ccd08c | 325 | mutex_unlock(&irtty_mutex); |
1da177e4 LT |
326 | return 0; |
327 | } | |
328 | ||
329 | /* notifier from sir_dev when irda% device gets closed (ifdown) */ | |
330 | ||
331 | static int irtty_stop_dev(struct sir_dev *dev) | |
332 | { | |
333 | struct sirtty_cb *priv; | |
334 | struct tty_struct *tty; | |
335 | ||
336 | /* serialize with ldisc open/close */ | |
d4ccd08c | 337 | mutex_lock(&irtty_mutex); |
1da177e4 LT |
338 | |
339 | priv = dev->priv; | |
340 | if (unlikely(!priv || priv->magic!=IRTTY_MAGIC)) { | |
d4ccd08c | 341 | mutex_unlock(&irtty_mutex); |
1da177e4 LT |
342 | return -ESTALE; |
343 | } | |
344 | ||
345 | tty = priv->tty; | |
346 | ||
347 | /* Make sure we don't receive more data */ | |
348 | irtty_stop_receiver(tty, TRUE); | |
f34d7a5b AC |
349 | if (tty->ops->stop) |
350 | tty->ops->stop(tty); | |
1da177e4 | 351 | |
d4ccd08c | 352 | mutex_unlock(&irtty_mutex); |
1da177e4 LT |
353 | |
354 | return 0; | |
355 | } | |
356 | ||
357 | /* ------------------------------------------------------- */ | |
358 | ||
359 | static struct sir_driver sir_tty_drv = { | |
360 | .owner = THIS_MODULE, | |
361 | .driver_name = "sir_tty", | |
362 | .start_dev = irtty_start_dev, | |
363 | .stop_dev = irtty_stop_dev, | |
364 | .do_write = irtty_do_write, | |
365 | .chars_in_buffer = irtty_chars_in_buffer, | |
366 | .wait_until_sent = irtty_wait_until_sent, | |
367 | .set_speed = irtty_change_speed, | |
368 | .set_dtr_rts = irtty_set_dtr_rts, | |
369 | }; | |
370 | ||
371 | /* ------------------------------------------------------- */ | |
372 | ||
373 | /* | |
374 | * Function irtty_ioctl (tty, file, cmd, arg) | |
375 | * | |
376 | * The Swiss army knife of system calls :-) | |
377 | * | |
378 | */ | |
379 | static int irtty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) | |
380 | { | |
381 | struct irtty_info { char name[6]; } info; | |
382 | struct sir_dev *dev; | |
383 | struct sirtty_cb *priv = tty->disc_data; | |
384 | int err = 0; | |
385 | ||
386 | IRDA_ASSERT(priv != NULL, return -ENODEV;); | |
387 | IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -EBADR;); | |
388 | ||
a97a6f10 | 389 | IRDA_DEBUG(3, "%s(cmd=0x%X)\n", __func__, cmd); |
1da177e4 LT |
390 | |
391 | dev = priv->dev; | |
392 | IRDA_ASSERT(dev != NULL, return -1;); | |
393 | ||
394 | switch (cmd) { | |
1da177e4 LT |
395 | case IRTTY_IOCTDONGLE: |
396 | /* this call blocks for completion */ | |
397 | err = sirdev_set_dongle(dev, (IRDA_DONGLE) arg); | |
398 | break; | |
399 | ||
400 | case IRTTY_IOCGET: | |
401 | IRDA_ASSERT(dev->netdev != NULL, return -1;); | |
402 | ||
403 | memset(&info, 0, sizeof(info)); | |
404 | strncpy(info.name, dev->netdev->name, sizeof(info.name)-1); | |
405 | ||
406 | if (copy_to_user((void __user *)arg, &info, sizeof(info))) | |
407 | err = -EFAULT; | |
408 | break; | |
409 | default: | |
d0127539 | 410 | err = tty_mode_ioctl(tty, file, cmd, arg); |
1da177e4 LT |
411 | break; |
412 | } | |
413 | return err; | |
414 | } | |
415 | ||
416 | ||
417 | /* | |
418 | * Function irtty_open(tty) | |
419 | * | |
420 | * This function is called by the TTY module when the IrDA line | |
421 | * discipline is called for. Because we are sure the tty line exists, | |
422 | * we only have to link it to a free IrDA channel. | |
423 | */ | |
424 | static int irtty_open(struct tty_struct *tty) | |
425 | { | |
426 | struct sir_dev *dev; | |
427 | struct sirtty_cb *priv; | |
428 | int ret = 0; | |
429 | ||
430 | /* Module stuff handled via irda_ldisc.owner - Jean II */ | |
431 | ||
432 | /* First make sure we're not already connected. */ | |
433 | if (tty->disc_data != NULL) { | |
434 | priv = tty->disc_data; | |
435 | if (priv && priv->magic == IRTTY_MAGIC) { | |
436 | ret = -EEXIST; | |
437 | goto out; | |
438 | } | |
439 | tty->disc_data = NULL; /* ### */ | |
440 | } | |
441 | ||
442 | /* stop the underlying driver */ | |
443 | irtty_stop_receiver(tty, TRUE); | |
f34d7a5b AC |
444 | if (tty->ops->stop) |
445 | tty->ops->stop(tty); | |
1da177e4 | 446 | |
f34d7a5b | 447 | tty_driver_flush_buffer(tty); |
1da177e4 LT |
448 | |
449 | /* apply mtt override */ | |
450 | sir_tty_drv.qos_mtt_bits = qos_mtt_bits; | |
451 | ||
452 | /* get a sir device instance for this driver */ | |
453 | dev = sirdev_get_instance(&sir_tty_drv, tty->name); | |
454 | if (!dev) { | |
455 | ret = -ENODEV; | |
456 | goto out; | |
457 | } | |
458 | ||
459 | /* allocate private device info block */ | |
dd00cc48 | 460 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
1da177e4 LT |
461 | if (!priv) |
462 | goto out_put; | |
1da177e4 LT |
463 | |
464 | priv->magic = IRTTY_MAGIC; | |
465 | priv->tty = tty; | |
466 | priv->dev = dev; | |
467 | ||
468 | /* serialize with start_dev - in case we were racing with ifup */ | |
d4ccd08c | 469 | mutex_lock(&irtty_mutex); |
1da177e4 LT |
470 | |
471 | dev->priv = priv; | |
472 | tty->disc_data = priv; | |
33f0f88f | 473 | tty->receive_room = 65536; |
1da177e4 | 474 | |
d4ccd08c | 475 | mutex_unlock(&irtty_mutex); |
1da177e4 | 476 | |
a97a6f10 | 477 | IRDA_DEBUG(0, "%s - %s: irda line discipline opened\n", __func__, tty->name); |
1da177e4 LT |
478 | |
479 | return 0; | |
480 | ||
481 | out_put: | |
482 | sirdev_put_instance(dev); | |
483 | out: | |
484 | return ret; | |
485 | } | |
486 | ||
487 | /* | |
488 | * Function irtty_close (tty) | |
489 | * | |
490 | * Close down a IrDA channel. This means flushing out any pending queues, | |
491 | * and then restoring the TTY line discipline to what it was before it got | |
492 | * hooked to IrDA (which usually is TTY again). | |
493 | */ | |
494 | static void irtty_close(struct tty_struct *tty) | |
495 | { | |
496 | struct sirtty_cb *priv = tty->disc_data; | |
497 | ||
498 | IRDA_ASSERT(priv != NULL, return;); | |
499 | IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;); | |
500 | ||
501 | /* Hm, with a dongle attached the dongle driver wants | |
502 | * to close the dongle - which requires the use of | |
503 | * some tty write and/or termios or ioctl operations. | |
504 | * Are we allowed to call those when already requested | |
505 | * to shutdown the ldisc? | |
506 | * If not, we should somehow mark the dev being staled. | |
507 | * Question remains, how to close the dongle in this case... | |
508 | * For now let's assume we are granted to issue tty driver calls | |
509 | * until we return here from the ldisc close. I'm just wondering | |
510 | * how this behaves with hotpluggable serial hardware like | |
511 | * rs232-pcmcia card or usb-serial... | |
512 | * | |
513 | * priv->tty = NULL?; | |
514 | */ | |
515 | ||
516 | /* we are dead now */ | |
517 | tty->disc_data = NULL; | |
518 | ||
519 | sirdev_put_instance(priv->dev); | |
520 | ||
521 | /* Stop tty */ | |
522 | irtty_stop_receiver(tty, TRUE); | |
8a1ec21e | 523 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
f34d7a5b AC |
524 | if (tty->ops->stop) |
525 | tty->ops->stop(tty); | |
1da177e4 LT |
526 | |
527 | kfree(priv); | |
528 | ||
a97a6f10 | 529 | IRDA_DEBUG(0, "%s - %s: irda line discipline closed\n", __func__, tty->name); |
1da177e4 LT |
530 | } |
531 | ||
532 | /* ------------------------------------------------------- */ | |
533 | ||
a352def2 | 534 | static struct tty_ldisc_ops irda_ldisc = { |
1da177e4 LT |
535 | .magic = TTY_LDISC_MAGIC, |
536 | .name = "irda", | |
537 | .flags = 0, | |
538 | .open = irtty_open, | |
539 | .close = irtty_close, | |
540 | .read = NULL, | |
541 | .write = NULL, | |
542 | .ioctl = irtty_ioctl, | |
543 | .poll = NULL, | |
544 | .receive_buf = irtty_receive_buf, | |
1da177e4 LT |
545 | .write_wakeup = irtty_write_wakeup, |
546 | .owner = THIS_MODULE, | |
547 | }; | |
548 | ||
549 | /* ------------------------------------------------------- */ | |
550 | ||
551 | static int __init irtty_sir_init(void) | |
552 | { | |
553 | int err; | |
554 | ||
555 | if ((err = tty_register_ldisc(N_IRDA, &irda_ldisc)) != 0) | |
556 | IRDA_ERROR("IrDA: can't register line discipline (err = %d)\n", | |
557 | err); | |
558 | return err; | |
559 | } | |
560 | ||
561 | static void __exit irtty_sir_cleanup(void) | |
562 | { | |
563 | int err; | |
564 | ||
64ccd715 | 565 | if ((err = tty_unregister_ldisc(N_IRDA))) { |
1da177e4 | 566 | IRDA_ERROR("%s(), can't unregister line discipline (err = %d)\n", |
a97a6f10 | 567 | __func__, err); |
1da177e4 LT |
568 | } |
569 | } | |
570 | ||
571 | module_init(irtty_sir_init); | |
572 | module_exit(irtty_sir_cleanup); | |
573 | ||
574 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
575 | MODULE_DESCRIPTION("IrDA TTY device driver"); | |
576 | MODULE_ALIAS_LDISC(N_IRDA); | |
577 | MODULE_LICENSE("GPL"); | |
578 |