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1da177e4 LT |
1 | /* |
2 | * cdc-acm.c | |
3 | * | |
4 | * Copyright (c) 1999 Armin Fuerst <fuerst@in.tum.de> | |
5 | * Copyright (c) 1999 Pavel Machek <pavel@suse.cz> | |
6 | * Copyright (c) 1999 Johannes Erdfelt <johannes@erdfelt.com> | |
7 | * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz> | |
8 | * Copyright (c) 2004 Oliver Neukum <oliver@neukum.name> | |
9 | * | |
10 | * USB Abstract Control Model driver for USB modems and ISDN adapters | |
11 | * | |
12 | * Sponsored by SuSE | |
13 | * | |
14 | * ChangeLog: | |
15 | * v0.9 - thorough cleaning, URBification, almost a rewrite | |
16 | * v0.10 - some more cleanups | |
17 | * v0.11 - fixed flow control, read error doesn't stop reads | |
18 | * v0.12 - added TIOCM ioctls, added break handling, made struct acm kmalloced | |
19 | * v0.13 - added termios, added hangup | |
20 | * v0.14 - sized down struct acm | |
21 | * v0.15 - fixed flow control again - characters could be lost | |
22 | * v0.16 - added code for modems with swapped data and control interfaces | |
23 | * v0.17 - added new style probing | |
24 | * v0.18 - fixed new style probing for devices with more configurations | |
25 | * v0.19 - fixed CLOCAL handling (thanks to Richard Shih-Ping Chan) | |
26 | * v0.20 - switched to probing on interface (rather than device) class | |
27 | * v0.21 - revert to probing on device for devices with multiple configs | |
28 | * v0.22 - probe only the control interface. if usbcore doesn't choose the | |
29 | * config we want, sysadmin changes bConfigurationValue in sysfs. | |
30 | * v0.23 - use softirq for rx processing, as needed by tty layer | |
31 | * v0.24 - change probe method to evaluate CDC union descriptor | |
32 | */ | |
33 | ||
34 | /* | |
35 | * This program is free software; you can redistribute it and/or modify | |
36 | * it under the terms of the GNU General Public License as published by | |
37 | * the Free Software Foundation; either version 2 of the License, or | |
38 | * (at your option) any later version. | |
39 | * | |
40 | * This program is distributed in the hope that it will be useful, | |
41 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
42 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
43 | * GNU General Public License for more details. | |
44 | * | |
45 | * You should have received a copy of the GNU General Public License | |
46 | * along with this program; if not, write to the Free Software | |
47 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
48 | */ | |
49 | ||
50 | #undef DEBUG | |
51 | ||
52 | #include <linux/kernel.h> | |
53 | #include <linux/errno.h> | |
54 | #include <linux/init.h> | |
55 | #include <linux/slab.h> | |
56 | #include <linux/tty.h> | |
57 | #include <linux/tty_driver.h> | |
58 | #include <linux/tty_flip.h> | |
59 | #include <linux/module.h> | |
60 | #include <linux/smp_lock.h> | |
61 | #include <asm/uaccess.h> | |
62 | #include <linux/usb.h> | |
63 | #include <linux/usb_cdc.h> | |
64 | #include <asm/byteorder.h> | |
65 | #include <asm/unaligned.h> | |
66 | ||
67 | #include "cdc-acm.h" | |
68 | ||
69 | /* | |
70 | * Version Information | |
71 | */ | |
72 | #define DRIVER_VERSION "v0.23" | |
73 | #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik" | |
74 | #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters" | |
75 | ||
76 | static struct usb_driver acm_driver; | |
77 | static struct tty_driver *acm_tty_driver; | |
78 | static struct acm *acm_table[ACM_TTY_MINORS]; | |
79 | ||
80 | static DECLARE_MUTEX(open_sem); | |
81 | ||
82 | #define ACM_READY(acm) (acm && acm->dev && acm->used) | |
83 | ||
84 | /* | |
85 | * Functions for ACM control messages. | |
86 | */ | |
87 | ||
88 | static int acm_ctrl_msg(struct acm *acm, int request, int value, void *buf, int len) | |
89 | { | |
90 | int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0), | |
91 | request, USB_RT_ACM, value, | |
92 | acm->control->altsetting[0].desc.bInterfaceNumber, | |
93 | buf, len, 5000); | |
94 | dbg("acm_control_msg: rq: 0x%02x val: %#x len: %#x result: %d", request, value, len, retval); | |
95 | return retval < 0 ? retval : 0; | |
96 | } | |
97 | ||
98 | /* devices aren't required to support these requests. | |
99 | * the cdc acm descriptor tells whether they do... | |
100 | */ | |
101 | #define acm_set_control(acm, control) \ | |
102 | acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0) | |
103 | #define acm_set_line(acm, line) \ | |
104 | acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line)) | |
105 | #define acm_send_break(acm, ms) \ | |
106 | acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0) | |
107 | ||
884b600f ON |
108 | /* |
109 | * Write buffer management. | |
110 | * All of these assume proper locks taken by the caller. | |
111 | */ | |
112 | ||
113 | static int acm_wb_alloc(struct acm *acm) | |
114 | { | |
115 | int i, wbn; | |
116 | struct acm_wb *wb; | |
117 | ||
118 | wbn = acm->write_current; | |
119 | i = 0; | |
120 | for (;;) { | |
121 | wb = &acm->wb[wbn]; | |
122 | if (!wb->use) { | |
123 | wb->use = 1; | |
124 | return wbn; | |
125 | } | |
126 | wbn = (wbn + 1) % ACM_NWB; | |
127 | if (++i >= ACM_NWB) | |
128 | return -1; | |
129 | } | |
130 | } | |
131 | ||
132 | static void acm_wb_free(struct acm *acm, int wbn) | |
133 | { | |
134 | acm->wb[wbn].use = 0; | |
135 | } | |
136 | ||
137 | static int acm_wb_is_avail(struct acm *acm) | |
138 | { | |
139 | int i, n; | |
140 | ||
141 | n = 0; | |
142 | for (i = 0; i < ACM_NWB; i++) { | |
143 | if (!acm->wb[i].use) | |
144 | n++; | |
145 | } | |
146 | return n; | |
147 | } | |
148 | ||
149 | static inline int acm_wb_is_used(struct acm *acm, int wbn) | |
150 | { | |
151 | return acm->wb[wbn].use; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Finish write. | |
156 | */ | |
157 | static void acm_write_done(struct acm *acm) | |
158 | { | |
159 | unsigned long flags; | |
160 | int wbn; | |
161 | ||
162 | spin_lock_irqsave(&acm->write_lock, flags); | |
163 | acm->write_ready = 1; | |
164 | wbn = acm->write_current; | |
165 | acm_wb_free(acm, wbn); | |
166 | acm->write_current = (wbn + 1) % ACM_NWB; | |
167 | spin_unlock_irqrestore(&acm->write_lock, flags); | |
168 | } | |
169 | ||
170 | /* | |
171 | * Poke write. | |
172 | */ | |
173 | static int acm_write_start(struct acm *acm) | |
174 | { | |
175 | unsigned long flags; | |
176 | int wbn; | |
177 | struct acm_wb *wb; | |
178 | int rc; | |
179 | ||
180 | spin_lock_irqsave(&acm->write_lock, flags); | |
181 | if (!acm->dev) { | |
182 | spin_unlock_irqrestore(&acm->write_lock, flags); | |
183 | return -ENODEV; | |
184 | } | |
185 | ||
186 | if (!acm->write_ready) { | |
187 | spin_unlock_irqrestore(&acm->write_lock, flags); | |
188 | return 0; /* A white lie */ | |
189 | } | |
190 | ||
191 | wbn = acm->write_current; | |
192 | if (!acm_wb_is_used(acm, wbn)) { | |
193 | spin_unlock_irqrestore(&acm->write_lock, flags); | |
194 | return 0; | |
195 | } | |
196 | wb = &acm->wb[wbn]; | |
197 | ||
198 | acm->write_ready = 0; | |
199 | spin_unlock_irqrestore(&acm->write_lock, flags); | |
200 | ||
201 | acm->writeurb->transfer_buffer = wb->buf; | |
202 | acm->writeurb->transfer_dma = wb->dmah; | |
203 | acm->writeurb->transfer_buffer_length = wb->len; | |
204 | acm->writeurb->dev = acm->dev; | |
205 | ||
206 | if ((rc = usb_submit_urb(acm->writeurb, GFP_ATOMIC)) < 0) { | |
207 | dbg("usb_submit_urb(write bulk) failed: %d", rc); | |
208 | acm_write_done(acm); | |
209 | } | |
210 | return rc; | |
211 | } | |
212 | ||
1da177e4 LT |
213 | /* |
214 | * Interrupt handlers for various ACM device responses | |
215 | */ | |
216 | ||
217 | /* control interface reports status changes with "interrupt" transfers */ | |
218 | static void acm_ctrl_irq(struct urb *urb, struct pt_regs *regs) | |
219 | { | |
220 | struct acm *acm = urb->context; | |
221 | struct usb_cdc_notification *dr = urb->transfer_buffer; | |
222 | unsigned char *data; | |
223 | int newctrl; | |
224 | int status; | |
225 | ||
226 | switch (urb->status) { | |
227 | case 0: | |
228 | /* success */ | |
229 | break; | |
230 | case -ECONNRESET: | |
231 | case -ENOENT: | |
232 | case -ESHUTDOWN: | |
233 | /* this urb is terminated, clean up */ | |
234 | dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status); | |
235 | return; | |
236 | default: | |
237 | dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status); | |
238 | goto exit; | |
239 | } | |
240 | ||
241 | if (!ACM_READY(acm)) | |
242 | goto exit; | |
243 | ||
244 | data = (unsigned char *)(dr + 1); | |
245 | switch (dr->bNotificationType) { | |
246 | ||
247 | case USB_CDC_NOTIFY_NETWORK_CONNECTION: | |
248 | ||
249 | dbg("%s network", dr->wValue ? "connected to" : "disconnected from"); | |
250 | break; | |
251 | ||
252 | case USB_CDC_NOTIFY_SERIAL_STATE: | |
253 | ||
254 | newctrl = le16_to_cpu(get_unaligned((__le16 *) data)); | |
255 | ||
256 | if (acm->tty && !acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) { | |
257 | dbg("calling hangup"); | |
258 | tty_hangup(acm->tty); | |
259 | } | |
260 | ||
261 | acm->ctrlin = newctrl; | |
262 | ||
263 | dbg("input control lines: dcd%c dsr%c break%c ring%c framing%c parity%c overrun%c", | |
264 | acm->ctrlin & ACM_CTRL_DCD ? '+' : '-', acm->ctrlin & ACM_CTRL_DSR ? '+' : '-', | |
265 | acm->ctrlin & ACM_CTRL_BRK ? '+' : '-', acm->ctrlin & ACM_CTRL_RI ? '+' : '-', | |
266 | acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-', acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-', | |
267 | acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-'); | |
268 | ||
269 | break; | |
270 | ||
271 | default: | |
272 | dbg("unknown notification %d received: index %d len %d data0 %d data1 %d", | |
273 | dr->bNotificationType, dr->wIndex, | |
274 | dr->wLength, data[0], data[1]); | |
275 | break; | |
276 | } | |
277 | exit: | |
278 | status = usb_submit_urb (urb, GFP_ATOMIC); | |
279 | if (status) | |
280 | err ("%s - usb_submit_urb failed with result %d", | |
281 | __FUNCTION__, status); | |
282 | } | |
283 | ||
284 | /* data interface returns incoming bytes, or we got unthrottled */ | |
285 | static void acm_read_bulk(struct urb *urb, struct pt_regs *regs) | |
286 | { | |
287 | struct acm *acm = urb->context; | |
288 | dbg("Entering acm_read_bulk with status %d\n", urb->status); | |
289 | ||
290 | if (!ACM_READY(acm)) | |
291 | return; | |
292 | ||
293 | if (urb->status) | |
294 | dev_dbg(&acm->data->dev, "bulk rx status %d\n", urb->status); | |
295 | ||
296 | /* calling tty_flip_buffer_push() in_irq() isn't allowed */ | |
297 | tasklet_schedule(&acm->bh); | |
298 | } | |
299 | ||
300 | static void acm_rx_tasklet(unsigned long _acm) | |
301 | { | |
302 | struct acm *acm = (void *)_acm; | |
303 | struct urb *urb = acm->readurb; | |
304 | struct tty_struct *tty = acm->tty; | |
305 | unsigned char *data = urb->transfer_buffer; | |
306 | int i = 0; | |
307 | dbg("Entering acm_rx_tasklet"); | |
308 | ||
309 | if (urb->actual_length > 0 && !acm->throttle) { | |
310 | for (i = 0; i < urb->actual_length && !acm->throttle; i++) { | |
311 | /* if we insert more than TTY_FLIPBUF_SIZE characters, | |
312 | * we drop them. */ | |
313 | if (tty->flip.count >= TTY_FLIPBUF_SIZE) { | |
314 | tty_flip_buffer_push(tty); | |
315 | } | |
316 | tty_insert_flip_char(tty, data[i], 0); | |
317 | } | |
318 | dbg("Handed %d bytes to tty layer", i+1); | |
319 | tty_flip_buffer_push(tty); | |
320 | } | |
321 | ||
322 | spin_lock(&acm->throttle_lock); | |
323 | if (acm->throttle) { | |
324 | dbg("Throtteling noticed"); | |
325 | memmove(data, data + i, urb->actual_length - i); | |
326 | urb->actual_length -= i; | |
327 | acm->resubmit_to_unthrottle = 1; | |
328 | spin_unlock(&acm->throttle_lock); | |
329 | return; | |
330 | } | |
331 | spin_unlock(&acm->throttle_lock); | |
332 | ||
333 | urb->actual_length = 0; | |
334 | urb->dev = acm->dev; | |
335 | ||
336 | i = usb_submit_urb(urb, GFP_ATOMIC); | |
337 | if (i) | |
338 | dev_dbg(&acm->data->dev, "bulk rx resubmit %d\n", i); | |
339 | } | |
340 | ||
341 | /* data interface wrote those outgoing bytes */ | |
342 | static void acm_write_bulk(struct urb *urb, struct pt_regs *regs) | |
343 | { | |
344 | struct acm *acm = (struct acm *)urb->context; | |
1da177e4 | 345 | |
884b600f | 346 | dbg("Entering acm_write_bulk with status %d\n", urb->status); |
1da177e4 | 347 | |
884b600f ON |
348 | acm_write_done(acm); |
349 | acm_write_start(acm); | |
350 | if (ACM_READY(acm)) | |
351 | schedule_work(&acm->work); | |
1da177e4 LT |
352 | } |
353 | ||
354 | static void acm_softint(void *private) | |
355 | { | |
356 | struct acm *acm = private; | |
357 | dbg("Entering acm_softint.\n"); | |
358 | ||
359 | if (!ACM_READY(acm)) | |
360 | return; | |
361 | tty_wakeup(acm->tty); | |
362 | } | |
363 | ||
364 | /* | |
365 | * TTY handlers | |
366 | */ | |
367 | ||
368 | static int acm_tty_open(struct tty_struct *tty, struct file *filp) | |
369 | { | |
370 | struct acm *acm; | |
371 | int rv = -EINVAL; | |
372 | dbg("Entering acm_tty_open.\n"); | |
373 | ||
374 | down(&open_sem); | |
375 | ||
376 | acm = acm_table[tty->index]; | |
377 | if (!acm || !acm->dev) | |
378 | goto err_out; | |
379 | else | |
380 | rv = 0; | |
381 | ||
382 | tty->driver_data = acm; | |
383 | acm->tty = tty; | |
384 | ||
385 | ||
386 | ||
387 | if (acm->used++) { | |
388 | goto done; | |
389 | } | |
390 | ||
391 | acm->ctrlurb->dev = acm->dev; | |
392 | if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) { | |
393 | dbg("usb_submit_urb(ctrl irq) failed"); | |
394 | goto bail_out; | |
395 | } | |
396 | ||
397 | acm->readurb->dev = acm->dev; | |
398 | if (usb_submit_urb(acm->readurb, GFP_KERNEL)) { | |
399 | dbg("usb_submit_urb(read bulk) failed"); | |
400 | goto bail_out_and_unlink; | |
401 | } | |
402 | ||
403 | if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS)) | |
404 | goto full_bailout; | |
405 | ||
406 | /* force low_latency on so that our tty_push actually forces the data through, | |
407 | otherwise it is scheduled, and with high data rates data can get lost. */ | |
408 | tty->low_latency = 1; | |
409 | ||
410 | done: | |
411 | err_out: | |
412 | up(&open_sem); | |
413 | return rv; | |
414 | ||
415 | full_bailout: | |
416 | usb_kill_urb(acm->readurb); | |
417 | bail_out_and_unlink: | |
418 | usb_kill_urb(acm->ctrlurb); | |
419 | bail_out: | |
420 | acm->used--; | |
421 | up(&open_sem); | |
422 | return -EIO; | |
423 | } | |
424 | ||
425 | static void acm_tty_close(struct tty_struct *tty, struct file *filp) | |
426 | { | |
427 | struct acm *acm = tty->driver_data; | |
428 | ||
429 | if (!acm || !acm->used) | |
430 | return; | |
431 | ||
432 | down(&open_sem); | |
433 | if (!--acm->used) { | |
434 | if (acm->dev) { | |
435 | acm_set_control(acm, acm->ctrlout = 0); | |
436 | usb_kill_urb(acm->ctrlurb); | |
437 | usb_kill_urb(acm->writeurb); | |
438 | usb_kill_urb(acm->readurb); | |
439 | } else { | |
440 | tty_unregister_device(acm_tty_driver, acm->minor); | |
441 | acm_table[acm->minor] = NULL; | |
442 | usb_free_urb(acm->ctrlurb); | |
443 | usb_free_urb(acm->readurb); | |
444 | usb_free_urb(acm->writeurb); | |
445 | kfree(acm); | |
446 | } | |
447 | } | |
448 | up(&open_sem); | |
449 | } | |
450 | ||
451 | static int acm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) | |
452 | { | |
453 | struct acm *acm = tty->driver_data; | |
454 | int stat; | |
884b600f ON |
455 | unsigned long flags; |
456 | int wbn; | |
457 | struct acm_wb *wb; | |
458 | ||
1da177e4 LT |
459 | dbg("Entering acm_tty_write to write %d bytes,\n", count); |
460 | ||
461 | if (!ACM_READY(acm)) | |
462 | return -EINVAL; | |
1da177e4 LT |
463 | if (!count) |
464 | return 0; | |
465 | ||
884b600f ON |
466 | spin_lock_irqsave(&acm->write_lock, flags); |
467 | if ((wbn = acm_wb_alloc(acm)) < 0) { | |
468 | spin_unlock_irqrestore(&acm->write_lock, flags); | |
469 | acm_write_start(acm); | |
470 | return 0; | |
471 | } | |
472 | wb = &acm->wb[wbn]; | |
1da177e4 | 473 | |
884b600f | 474 | count = (count > acm->writesize) ? acm->writesize : count; |
1da177e4 | 475 | dbg("Get %d bytes...", count); |
884b600f ON |
476 | memcpy(wb->buf, buf, count); |
477 | wb->len = count; | |
478 | spin_unlock_irqrestore(&acm->write_lock, flags); | |
1da177e4 | 479 | |
884b600f | 480 | if ((stat = acm_write_start(acm)) < 0) |
1da177e4 | 481 | return stat; |
1da177e4 LT |
482 | return count; |
483 | } | |
484 | ||
485 | static int acm_tty_write_room(struct tty_struct *tty) | |
486 | { | |
487 | struct acm *acm = tty->driver_data; | |
488 | if (!ACM_READY(acm)) | |
489 | return -EINVAL; | |
884b600f ON |
490 | /* |
491 | * Do not let the line discipline to know that we have a reserve, | |
492 | * or it might get too enthusiastic. | |
493 | */ | |
494 | return (acm->write_ready && acm_wb_is_avail(acm)) ? acm->writesize : 0; | |
1da177e4 LT |
495 | } |
496 | ||
497 | static int acm_tty_chars_in_buffer(struct tty_struct *tty) | |
498 | { | |
499 | struct acm *acm = tty->driver_data; | |
500 | if (!ACM_READY(acm)) | |
501 | return -EINVAL; | |
884b600f ON |
502 | /* |
503 | * This is inaccurate (overcounts), but it works. | |
504 | */ | |
505 | return (ACM_NWB - acm_wb_is_avail(acm)) * acm->writesize; | |
1da177e4 LT |
506 | } |
507 | ||
508 | static void acm_tty_throttle(struct tty_struct *tty) | |
509 | { | |
510 | struct acm *acm = tty->driver_data; | |
511 | if (!ACM_READY(acm)) | |
512 | return; | |
513 | spin_lock_bh(&acm->throttle_lock); | |
514 | acm->throttle = 1; | |
515 | spin_unlock_bh(&acm->throttle_lock); | |
516 | } | |
517 | ||
518 | static void acm_tty_unthrottle(struct tty_struct *tty) | |
519 | { | |
520 | struct acm *acm = tty->driver_data; | |
521 | if (!ACM_READY(acm)) | |
522 | return; | |
523 | spin_lock_bh(&acm->throttle_lock); | |
524 | acm->throttle = 0; | |
525 | spin_unlock_bh(&acm->throttle_lock); | |
526 | if (acm->resubmit_to_unthrottle) { | |
527 | acm->resubmit_to_unthrottle = 0; | |
528 | acm_read_bulk(acm->readurb, NULL); | |
529 | } | |
530 | } | |
531 | ||
532 | static void acm_tty_break_ctl(struct tty_struct *tty, int state) | |
533 | { | |
534 | struct acm *acm = tty->driver_data; | |
535 | if (!ACM_READY(acm)) | |
536 | return; | |
537 | if (acm_send_break(acm, state ? 0xffff : 0)) | |
538 | dbg("send break failed"); | |
539 | } | |
540 | ||
541 | static int acm_tty_tiocmget(struct tty_struct *tty, struct file *file) | |
542 | { | |
543 | struct acm *acm = tty->driver_data; | |
544 | ||
545 | if (!ACM_READY(acm)) | |
546 | return -EINVAL; | |
547 | ||
548 | return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) | | |
549 | (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) | | |
550 | (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) | | |
551 | (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) | | |
552 | (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) | | |
553 | TIOCM_CTS; | |
554 | } | |
555 | ||
556 | static int acm_tty_tiocmset(struct tty_struct *tty, struct file *file, | |
557 | unsigned int set, unsigned int clear) | |
558 | { | |
559 | struct acm *acm = tty->driver_data; | |
560 | unsigned int newctrl; | |
561 | ||
562 | if (!ACM_READY(acm)) | |
563 | return -EINVAL; | |
564 | ||
565 | newctrl = acm->ctrlout; | |
566 | set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (set & TIOCM_RTS ? ACM_CTRL_RTS : 0); | |
567 | clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0); | |
568 | ||
569 | newctrl = (newctrl & ~clear) | set; | |
570 | ||
571 | if (acm->ctrlout == newctrl) | |
572 | return 0; | |
573 | return acm_set_control(acm, acm->ctrlout = newctrl); | |
574 | } | |
575 | ||
576 | static int acm_tty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) | |
577 | { | |
578 | struct acm *acm = tty->driver_data; | |
579 | ||
580 | if (!ACM_READY(acm)) | |
581 | return -EINVAL; | |
582 | ||
583 | return -ENOIOCTLCMD; | |
584 | } | |
585 | ||
586 | static __u32 acm_tty_speed[] = { | |
587 | 0, 50, 75, 110, 134, 150, 200, 300, 600, | |
588 | 1200, 1800, 2400, 4800, 9600, 19200, 38400, | |
589 | 57600, 115200, 230400, 460800, 500000, 576000, | |
590 | 921600, 1000000, 1152000, 1500000, 2000000, | |
591 | 2500000, 3000000, 3500000, 4000000 | |
592 | }; | |
593 | ||
594 | static __u8 acm_tty_size[] = { | |
595 | 5, 6, 7, 8 | |
596 | }; | |
597 | ||
598 | static void acm_tty_set_termios(struct tty_struct *tty, struct termios *termios_old) | |
599 | { | |
600 | struct acm *acm = tty->driver_data; | |
601 | struct termios *termios = tty->termios; | |
602 | struct usb_cdc_line_coding newline; | |
603 | int newctrl = acm->ctrlout; | |
604 | ||
605 | if (!ACM_READY(acm)) | |
606 | return; | |
607 | ||
608 | newline.dwDTERate = cpu_to_le32p(acm_tty_speed + | |
609 | (termios->c_cflag & CBAUD & ~CBAUDEX) + (termios->c_cflag & CBAUDEX ? 15 : 0)); | |
610 | newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0; | |
611 | newline.bParityType = termios->c_cflag & PARENB ? | |
612 | (termios->c_cflag & PARODD ? 1 : 2) + (termios->c_cflag & CMSPAR ? 2 : 0) : 0; | |
613 | newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4]; | |
614 | ||
615 | acm->clocal = ((termios->c_cflag & CLOCAL) != 0); | |
616 | ||
617 | if (!newline.dwDTERate) { | |
618 | newline.dwDTERate = acm->line.dwDTERate; | |
619 | newctrl &= ~ACM_CTRL_DTR; | |
620 | } else newctrl |= ACM_CTRL_DTR; | |
621 | ||
622 | if (newctrl != acm->ctrlout) | |
623 | acm_set_control(acm, acm->ctrlout = newctrl); | |
624 | ||
625 | if (memcmp(&acm->line, &newline, sizeof newline)) { | |
626 | memcpy(&acm->line, &newline, sizeof newline); | |
627 | dbg("set line: %d %d %d %d", le32_to_cpu(newline.dwDTERate), | |
628 | newline.bCharFormat, newline.bParityType, | |
629 | newline.bDataBits); | |
630 | acm_set_line(acm, &acm->line); | |
631 | } | |
632 | } | |
633 | ||
634 | /* | |
635 | * USB probe and disconnect routines. | |
636 | */ | |
637 | ||
884b600f ON |
638 | /* Little helper: write buffers free */ |
639 | static void acm_write_buffers_free(struct acm *acm) | |
640 | { | |
641 | int i; | |
642 | struct acm_wb *wb; | |
643 | ||
644 | for (wb = &acm->wb[0], i = 0; i < ACM_NWB; i++, wb++) { | |
645 | usb_buffer_free(acm->dev, acm->writesize, wb->buf, wb->dmah); | |
646 | } | |
647 | } | |
648 | ||
649 | /* Little helper: write buffers allocate */ | |
650 | static int acm_write_buffers_alloc(struct acm *acm) | |
651 | { | |
652 | int i; | |
653 | struct acm_wb *wb; | |
654 | ||
655 | for (wb = &acm->wb[0], i = 0; i < ACM_NWB; i++, wb++) { | |
656 | wb->buf = usb_buffer_alloc(acm->dev, acm->writesize, GFP_KERNEL, | |
657 | &wb->dmah); | |
658 | if (!wb->buf) { | |
659 | while (i != 0) { | |
660 | --i; | |
661 | --wb; | |
662 | usb_buffer_free(acm->dev, acm->writesize, | |
663 | wb->buf, wb->dmah); | |
664 | } | |
665 | return -ENOMEM; | |
666 | } | |
667 | } | |
668 | return 0; | |
669 | } | |
670 | ||
1da177e4 LT |
671 | static int acm_probe (struct usb_interface *intf, |
672 | const struct usb_device_id *id) | |
673 | { | |
674 | struct usb_cdc_union_desc *union_header = NULL; | |
675 | char *buffer = intf->altsetting->extra; | |
676 | int buflen = intf->altsetting->extralen; | |
677 | struct usb_interface *control_interface; | |
678 | struct usb_interface *data_interface; | |
679 | struct usb_endpoint_descriptor *epctrl; | |
680 | struct usb_endpoint_descriptor *epread; | |
681 | struct usb_endpoint_descriptor *epwrite; | |
682 | struct usb_device *usb_dev = interface_to_usbdev(intf); | |
683 | struct acm *acm; | |
684 | int minor; | |
685 | int ctrlsize,readsize; | |
686 | u8 *buf; | |
687 | u8 ac_management_function = 0; | |
688 | u8 call_management_function = 0; | |
689 | int call_interface_num = -1; | |
690 | int data_interface_num; | |
691 | unsigned long quirks; | |
692 | ||
693 | /* handle quirks deadly to normal probing*/ | |
694 | quirks = (unsigned long)id->driver_info; | |
695 | if (quirks == NO_UNION_NORMAL) { | |
696 | data_interface = usb_ifnum_to_if(usb_dev, 1); | |
697 | control_interface = usb_ifnum_to_if(usb_dev, 0); | |
698 | goto skip_normal_probe; | |
699 | } | |
700 | ||
701 | /* normal probing*/ | |
702 | if (!buffer) { | |
703 | err("Wierd descriptor references\n"); | |
704 | return -EINVAL; | |
705 | } | |
706 | ||
707 | if (!buflen) { | |
708 | if (intf->cur_altsetting->endpoint->extralen && intf->cur_altsetting->endpoint->extra) { | |
709 | dev_dbg(&intf->dev,"Seeking extra descriptors on endpoint\n"); | |
710 | buflen = intf->cur_altsetting->endpoint->extralen; | |
711 | buffer = intf->cur_altsetting->endpoint->extra; | |
712 | } else { | |
713 | err("Zero length descriptor references\n"); | |
714 | return -EINVAL; | |
715 | } | |
716 | } | |
717 | ||
718 | while (buflen > 0) { | |
719 | if (buffer [1] != USB_DT_CS_INTERFACE) { | |
720 | err("skipping garbage\n"); | |
721 | goto next_desc; | |
722 | } | |
723 | ||
724 | switch (buffer [2]) { | |
725 | case USB_CDC_UNION_TYPE: /* we've found it */ | |
726 | if (union_header) { | |
727 | err("More than one union descriptor, skipping ..."); | |
728 | goto next_desc; | |
729 | } | |
730 | union_header = (struct usb_cdc_union_desc *) | |
731 | buffer; | |
732 | break; | |
733 | case USB_CDC_COUNTRY_TYPE: /* maybe somehow export */ | |
734 | break; /* for now we ignore it */ | |
735 | case USB_CDC_HEADER_TYPE: /* maybe check version */ | |
736 | break; /* for now we ignore it */ | |
737 | case USB_CDC_ACM_TYPE: | |
738 | ac_management_function = buffer[3]; | |
739 | break; | |
740 | case USB_CDC_CALL_MANAGEMENT_TYPE: | |
741 | call_management_function = buffer[3]; | |
742 | call_interface_num = buffer[4]; | |
743 | if ((call_management_function & 3) != 3) | |
744 | err("This device cannot do calls on its own. It is no modem."); | |
745 | break; | |
746 | ||
747 | default: | |
748 | err("Ignoring extra header, type %d, length %d", buffer[2], buffer[0]); | |
749 | break; | |
750 | } | |
751 | next_desc: | |
752 | buflen -= buffer[0]; | |
753 | buffer += buffer[0]; | |
754 | } | |
755 | ||
756 | if (!union_header) { | |
757 | if (call_interface_num > 0) { | |
758 | dev_dbg(&intf->dev,"No union descriptor, using call management descriptor\n"); | |
759 | data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num)); | |
760 | control_interface = intf; | |
761 | } else { | |
762 | dev_dbg(&intf->dev,"No union descriptor, giving up\n"); | |
763 | return -ENODEV; | |
764 | } | |
765 | } else { | |
766 | control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0); | |
767 | data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0)); | |
768 | if (!control_interface || !data_interface) { | |
769 | dev_dbg(&intf->dev,"no interfaces\n"); | |
770 | return -ENODEV; | |
771 | } | |
772 | } | |
773 | ||
774 | if (data_interface_num != call_interface_num) | |
775 | dev_dbg(&intf->dev,"Seperate call control interface. That is not fully supported.\n"); | |
776 | ||
777 | skip_normal_probe: | |
778 | ||
779 | /*workaround for switched interfaces */ | |
780 | if (data_interface->cur_altsetting->desc.bInterfaceClass != CDC_DATA_INTERFACE_TYPE) { | |
781 | if (control_interface->cur_altsetting->desc.bInterfaceClass == CDC_DATA_INTERFACE_TYPE) { | |
782 | struct usb_interface *t; | |
783 | dev_dbg(&intf->dev,"Your device has switched interfaces.\n"); | |
784 | ||
785 | t = control_interface; | |
786 | control_interface = data_interface; | |
787 | data_interface = t; | |
788 | } else { | |
789 | return -EINVAL; | |
790 | } | |
791 | } | |
792 | ||
793 | if (usb_interface_claimed(data_interface)) { /* valid in this context */ | |
794 | dev_dbg(&intf->dev,"The data interface isn't available\n"); | |
795 | return -EBUSY; | |
796 | } | |
797 | ||
798 | ||
799 | if (data_interface->cur_altsetting->desc.bNumEndpoints < 2) | |
800 | return -EINVAL; | |
801 | ||
802 | epctrl = &control_interface->cur_altsetting->endpoint[0].desc; | |
803 | epread = &data_interface->cur_altsetting->endpoint[0].desc; | |
804 | epwrite = &data_interface->cur_altsetting->endpoint[1].desc; | |
805 | ||
806 | ||
807 | /* workaround for switched endpoints */ | |
808 | if ((epread->bEndpointAddress & USB_DIR_IN) != USB_DIR_IN) { | |
809 | /* descriptors are swapped */ | |
810 | struct usb_endpoint_descriptor *t; | |
811 | dev_dbg(&intf->dev,"The data interface has switched endpoints\n"); | |
812 | ||
813 | t = epread; | |
814 | epread = epwrite; | |
815 | epwrite = t; | |
816 | } | |
817 | dbg("interfaces are valid"); | |
818 | for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++); | |
819 | ||
820 | if (minor == ACM_TTY_MINORS) { | |
821 | err("no more free acm devices"); | |
822 | return -ENODEV; | |
823 | } | |
824 | ||
825 | if (!(acm = kmalloc(sizeof(struct acm), GFP_KERNEL))) { | |
826 | dev_dbg(&intf->dev, "out of memory (acm kmalloc)\n"); | |
827 | goto alloc_fail; | |
828 | } | |
829 | memset(acm, 0, sizeof(struct acm)); | |
830 | ||
831 | ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize); | |
832 | readsize = le16_to_cpu(epread->wMaxPacketSize); | |
833 | acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize); | |
834 | acm->control = control_interface; | |
835 | acm->data = data_interface; | |
836 | acm->minor = minor; | |
837 | acm->dev = usb_dev; | |
838 | acm->ctrl_caps = ac_management_function; | |
839 | acm->ctrlsize = ctrlsize; | |
840 | acm->readsize = readsize; | |
841 | acm->bh.func = acm_rx_tasklet; | |
842 | acm->bh.data = (unsigned long) acm; | |
843 | INIT_WORK(&acm->work, acm_softint, acm); | |
844 | spin_lock_init(&acm->throttle_lock); | |
884b600f ON |
845 | spin_lock_init(&acm->write_lock); |
846 | acm->write_ready = 1; | |
1da177e4 LT |
847 | |
848 | buf = usb_buffer_alloc(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma); | |
849 | if (!buf) { | |
850 | dev_dbg(&intf->dev, "out of memory (ctrl buffer alloc)\n"); | |
851 | goto alloc_fail2; | |
852 | } | |
853 | acm->ctrl_buffer = buf; | |
854 | ||
855 | buf = usb_buffer_alloc(usb_dev, readsize, GFP_KERNEL, &acm->read_dma); | |
856 | if (!buf) { | |
857 | dev_dbg(&intf->dev, "out of memory (read buffer alloc)\n"); | |
858 | goto alloc_fail3; | |
859 | } | |
860 | acm->read_buffer = buf; | |
861 | ||
884b600f | 862 | if (acm_write_buffers_alloc(acm) < 0) { |
1da177e4 LT |
863 | dev_dbg(&intf->dev, "out of memory (write buffer alloc)\n"); |
864 | goto alloc_fail4; | |
865 | } | |
1da177e4 LT |
866 | |
867 | acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL); | |
868 | if (!acm->ctrlurb) { | |
869 | dev_dbg(&intf->dev, "out of memory (ctrlurb kmalloc)\n"); | |
870 | goto alloc_fail5; | |
871 | } | |
872 | acm->readurb = usb_alloc_urb(0, GFP_KERNEL); | |
873 | if (!acm->readurb) { | |
874 | dev_dbg(&intf->dev, "out of memory (readurb kmalloc)\n"); | |
875 | goto alloc_fail6; | |
876 | } | |
877 | acm->writeurb = usb_alloc_urb(0, GFP_KERNEL); | |
878 | if (!acm->writeurb) { | |
879 | dev_dbg(&intf->dev, "out of memory (writeurb kmalloc)\n"); | |
880 | goto alloc_fail7; | |
881 | } | |
882 | ||
883 | usb_fill_int_urb(acm->ctrlurb, usb_dev, usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress), | |
884 | acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm, epctrl->bInterval); | |
885 | acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
886 | acm->ctrlurb->transfer_dma = acm->ctrl_dma; | |
887 | ||
888 | usb_fill_bulk_urb(acm->readurb, usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress), | |
889 | acm->read_buffer, readsize, acm_read_bulk, acm); | |
890 | acm->readurb->transfer_flags |= URB_NO_FSBR | URB_NO_TRANSFER_DMA_MAP; | |
891 | acm->readurb->transfer_dma = acm->read_dma; | |
892 | ||
893 | usb_fill_bulk_urb(acm->writeurb, usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress), | |
884b600f | 894 | NULL, acm->writesize, acm_write_bulk, acm); |
1da177e4 | 895 | acm->writeurb->transfer_flags |= URB_NO_FSBR | URB_NO_TRANSFER_DMA_MAP; |
884b600f | 896 | /* acm->writeurb->transfer_dma = 0; */ |
1da177e4 LT |
897 | |
898 | dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor); | |
899 | ||
900 | acm_set_control(acm, acm->ctrlout); | |
901 | ||
902 | acm->line.dwDTERate = cpu_to_le32(9600); | |
903 | acm->line.bDataBits = 8; | |
904 | acm_set_line(acm, &acm->line); | |
905 | ||
906 | usb_driver_claim_interface(&acm_driver, data_interface, acm); | |
907 | ||
908 | tty_register_device(acm_tty_driver, minor, &intf->dev); | |
909 | ||
910 | acm_table[minor] = acm; | |
911 | usb_set_intfdata (intf, acm); | |
912 | return 0; | |
913 | ||
914 | alloc_fail7: | |
915 | usb_free_urb(acm->readurb); | |
916 | alloc_fail6: | |
917 | usb_free_urb(acm->ctrlurb); | |
918 | alloc_fail5: | |
884b600f | 919 | acm_write_buffers_free(acm); |
1da177e4 LT |
920 | alloc_fail4: |
921 | usb_buffer_free(usb_dev, readsize, acm->read_buffer, acm->read_dma); | |
922 | alloc_fail3: | |
923 | usb_buffer_free(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma); | |
924 | alloc_fail2: | |
925 | kfree(acm); | |
926 | alloc_fail: | |
927 | return -ENOMEM; | |
928 | } | |
929 | ||
930 | static void acm_disconnect(struct usb_interface *intf) | |
931 | { | |
932 | struct acm *acm = usb_get_intfdata (intf); | |
933 | struct usb_device *usb_dev = interface_to_usbdev(intf); | |
934 | ||
935 | if (!acm || !acm->dev) { | |
936 | dbg("disconnect on nonexisting interface"); | |
937 | return; | |
938 | } | |
939 | ||
940 | down(&open_sem); | |
941 | acm->dev = NULL; | |
942 | usb_set_intfdata (intf, NULL); | |
943 | ||
944 | usb_kill_urb(acm->ctrlurb); | |
945 | usb_kill_urb(acm->readurb); | |
946 | usb_kill_urb(acm->writeurb); | |
947 | ||
948 | flush_scheduled_work(); /* wait for acm_softint */ | |
949 | ||
884b600f | 950 | acm_write_buffers_free(acm); |
1da177e4 LT |
951 | usb_buffer_free(usb_dev, acm->readsize, acm->read_buffer, acm->read_dma); |
952 | usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma); | |
953 | ||
954 | usb_driver_release_interface(&acm_driver, acm->data); | |
955 | ||
956 | if (!acm->used) { | |
957 | tty_unregister_device(acm_tty_driver, acm->minor); | |
958 | acm_table[acm->minor] = NULL; | |
959 | usb_free_urb(acm->ctrlurb); | |
960 | usb_free_urb(acm->readurb); | |
961 | usb_free_urb(acm->writeurb); | |
962 | kfree(acm); | |
963 | up(&open_sem); | |
964 | return; | |
965 | } | |
966 | ||
967 | up(&open_sem); | |
968 | ||
969 | if (acm->tty) | |
970 | tty_hangup(acm->tty); | |
971 | } | |
972 | ||
973 | /* | |
974 | * USB driver structure. | |
975 | */ | |
976 | ||
977 | static struct usb_device_id acm_ids[] = { | |
978 | /* quirky and broken devices */ | |
979 | { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */ | |
980 | .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ | |
981 | }, | |
982 | /* control interfaces with various AT-command sets */ | |
983 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, | |
984 | USB_CDC_ACM_PROTO_AT_V25TER) }, | |
985 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, | |
986 | USB_CDC_ACM_PROTO_AT_PCCA101) }, | |
987 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, | |
988 | USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) }, | |
989 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, | |
990 | USB_CDC_ACM_PROTO_AT_GSM) }, | |
991 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, | |
992 | USB_CDC_ACM_PROTO_AT_3G ) }, | |
993 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, | |
994 | USB_CDC_ACM_PROTO_AT_CDMA) }, | |
995 | ||
996 | /* NOTE: COMM/ACM/0xff is likely MSFT RNDIS ... NOT a modem!! */ | |
997 | { } | |
998 | }; | |
999 | ||
1000 | MODULE_DEVICE_TABLE (usb, acm_ids); | |
1001 | ||
1002 | static struct usb_driver acm_driver = { | |
1003 | .owner = THIS_MODULE, | |
1004 | .name = "cdc_acm", | |
1005 | .probe = acm_probe, | |
1006 | .disconnect = acm_disconnect, | |
1007 | .id_table = acm_ids, | |
1008 | }; | |
1009 | ||
1010 | /* | |
1011 | * TTY driver structures. | |
1012 | */ | |
1013 | ||
1014 | static struct tty_operations acm_ops = { | |
1015 | .open = acm_tty_open, | |
1016 | .close = acm_tty_close, | |
1017 | .write = acm_tty_write, | |
1018 | .write_room = acm_tty_write_room, | |
1019 | .ioctl = acm_tty_ioctl, | |
1020 | .throttle = acm_tty_throttle, | |
1021 | .unthrottle = acm_tty_unthrottle, | |
1022 | .chars_in_buffer = acm_tty_chars_in_buffer, | |
1023 | .break_ctl = acm_tty_break_ctl, | |
1024 | .set_termios = acm_tty_set_termios, | |
1025 | .tiocmget = acm_tty_tiocmget, | |
1026 | .tiocmset = acm_tty_tiocmset, | |
1027 | }; | |
1028 | ||
1029 | /* | |
1030 | * Init / exit. | |
1031 | */ | |
1032 | ||
1033 | static int __init acm_init(void) | |
1034 | { | |
1035 | int retval; | |
1036 | acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS); | |
1037 | if (!acm_tty_driver) | |
1038 | return -ENOMEM; | |
1039 | acm_tty_driver->owner = THIS_MODULE, | |
1040 | acm_tty_driver->driver_name = "acm", | |
1041 | acm_tty_driver->name = "ttyACM", | |
1042 | acm_tty_driver->devfs_name = "usb/acm/", | |
1043 | acm_tty_driver->major = ACM_TTY_MAJOR, | |
1044 | acm_tty_driver->minor_start = 0, | |
1045 | acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL, | |
1046 | acm_tty_driver->subtype = SERIAL_TYPE_NORMAL, | |
1047 | acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS, | |
1048 | acm_tty_driver->init_termios = tty_std_termios; | |
1049 | acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
1050 | tty_set_operations(acm_tty_driver, &acm_ops); | |
1051 | ||
1052 | retval = tty_register_driver(acm_tty_driver); | |
1053 | if (retval) { | |
1054 | put_tty_driver(acm_tty_driver); | |
1055 | return retval; | |
1056 | } | |
1057 | ||
1058 | retval = usb_register(&acm_driver); | |
1059 | if (retval) { | |
1060 | tty_unregister_driver(acm_tty_driver); | |
1061 | put_tty_driver(acm_tty_driver); | |
1062 | return retval; | |
1063 | } | |
1064 | ||
1065 | info(DRIVER_VERSION ":" DRIVER_DESC); | |
1066 | ||
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | static void __exit acm_exit(void) | |
1071 | { | |
1072 | usb_deregister(&acm_driver); | |
1073 | tty_unregister_driver(acm_tty_driver); | |
1074 | put_tty_driver(acm_tty_driver); | |
1075 | } | |
1076 | ||
1077 | module_init(acm_init); | |
1078 | module_exit(acm_exit); | |
1079 | ||
1080 | MODULE_AUTHOR( DRIVER_AUTHOR ); | |
1081 | MODULE_DESCRIPTION( DRIVER_DESC ); | |
1082 | MODULE_LICENSE("GPL"); | |
1083 |