projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
USB: cdc-acm: fix write and resume race
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / class / cdc-acm.c
1 /*
2 * cdc-acm.c
3 *
4 * Copyright (c) 1999 Armin Fuerst <fuerst@in.tum.de>
5 * Copyright (c) 1999 Pavel Machek <pavel@ucw.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 * Copyright (c) 2005 David Kubicek <dave@awk.cz>
10 * Copyright (c) 2011 Johan Hovold <jhovold@gmail.com>
11 *
12 * USB Abstract Control Model driver for USB modems and ISDN adapters
13 *
14 * Sponsored by SuSE
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 */
30
31 #undef DEBUG
32 #undef VERBOSE_DEBUG
33
34 #include <linux/kernel.h>
35 #include <linux/errno.h>
36 #include <linux/init.h>
37 #include <linux/slab.h>
38 #include <linux/tty.h>
39 #include <linux/serial.h>
40 #include <linux/tty_driver.h>
41 #include <linux/tty_flip.h>
42 #include <linux/module.h>
43 #include <linux/mutex.h>
44 #include <linux/uaccess.h>
45 #include <linux/usb.h>
46 #include <linux/usb/cdc.h>
47 #include <asm/byteorder.h>
48 #include <asm/unaligned.h>
49 #include <linux/list.h>
50
51 #include "cdc-acm.h"
52
53
54 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
55 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
56
57 static struct usb_driver acm_driver;
58 static struct tty_driver *acm_tty_driver;
59 static struct acm *acm_table[ACM_TTY_MINORS];
60
61 static DEFINE_MUTEX(acm_table_lock);
62
63 /*
64 * acm_table accessors
65 */
66
67 /*
68 * Look up an ACM structure by index. If found and not disconnected, increment
69 * its refcount and return it with its mutex held.
70 */
71 static struct acm *acm_get_by_index(unsigned index)
72 {
73 struct acm *acm;
74
75 mutex_lock(&acm_table_lock);
76 acm = acm_table[index];
77 if (acm) {
78 mutex_lock(&acm->mutex);
79 if (acm->disconnected) {
80 mutex_unlock(&acm->mutex);
81 acm = NULL;
82 } else {
83 tty_port_get(&acm->port);
84 mutex_unlock(&acm->mutex);
85 }
86 }
87 mutex_unlock(&acm_table_lock);
88 return acm;
89 }
90
91 /*
92 * Try to find an available minor number and if found, associate it with 'acm'.
93 */
94 static int acm_alloc_minor(struct acm *acm)
95 {
96 int minor;
97
98 mutex_lock(&acm_table_lock);
99 for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
100 if (!acm_table[minor]) {
101 acm_table[minor] = acm;
102 break;
103 }
104 }
105 mutex_unlock(&acm_table_lock);
106
107 return minor;
108 }
109
110 /* Release the minor number associated with 'acm'. */
111 static void acm_release_minor(struct acm *acm)
112 {
113 mutex_lock(&acm_table_lock);
114 acm_table[acm->minor] = NULL;
115 mutex_unlock(&acm_table_lock);
116 }
117
118 /*
119 * Functions for ACM control messages.
120 */
121
122 static int acm_ctrl_msg(struct acm *acm, int request, int value,
123 void *buf, int len)
124 {
125 int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
126 request, USB_RT_ACM, value,
127 acm->control->altsetting[0].desc.bInterfaceNumber,
128 buf, len, 5000);
129 dev_dbg(&acm->control->dev,
130 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
131 __func__, request, value, len, retval);
132 return retval < 0 ? retval : 0;
133 }
134
135 /* devices aren't required to support these requests.
136 * the cdc acm descriptor tells whether they do...
137 */
138 #define acm_set_control(acm, control) \
139 acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
140 #define acm_set_line(acm, line) \
141 acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
142 #define acm_send_break(acm, ms) \
143 acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
144
145 /*
146 * Write buffer management.
147 * All of these assume proper locks taken by the caller.
148 */
149
150 static int acm_wb_alloc(struct acm *acm)
151 {
152 int i, wbn;
153 struct acm_wb *wb;
154
155 wbn = 0;
156 i = 0;
157 for (;;) {
158 wb = &acm->wb[wbn];
159 if (!wb->use) {
160 wb->use = 1;
161 return wbn;
162 }
163 wbn = (wbn + 1) % ACM_NW;
164 if (++i >= ACM_NW)
165 return -1;
166 }
167 }
168
169 static int acm_wb_is_avail(struct acm *acm)
170 {
171 int i, n;
172 unsigned long flags;
173
174 n = ACM_NW;
175 spin_lock_irqsave(&acm->write_lock, flags);
176 for (i = 0; i < ACM_NW; i++)
177 n -= acm->wb[i].use;
178 spin_unlock_irqrestore(&acm->write_lock, flags);
179 return n;
180 }
181
182 /*
183 * Finish write. Caller must hold acm->write_lock
184 */
185 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
186 {
187 wb->use = 0;
188 acm->transmitting--;
189 usb_autopm_put_interface_async(acm->control);
190 }
191
192 /*
193 * Poke write.
194 *
195 * the caller is responsible for locking
196 */
197
198 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
199 {
200 int rc;
201
202 acm->transmitting++;
203
204 wb->urb->transfer_buffer = wb->buf;
205 wb->urb->transfer_dma = wb->dmah;
206 wb->urb->transfer_buffer_length = wb->len;
207 wb->urb->dev = acm->dev;
208
209 rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
210 if (rc < 0) {
211 dev_err(&acm->data->dev,
212 "%s - usb_submit_urb(write bulk) failed: %d\n",
213 __func__, rc);
214 acm_write_done(acm, wb);
215 }
216 return rc;
217 }
218
219 static int acm_write_start(struct acm *acm, int wbn)
220 {
221 unsigned long flags;
222 struct acm_wb *wb = &acm->wb[wbn];
223 int rc;
224
225 spin_lock_irqsave(&acm->write_lock, flags);
226 if (!acm->dev) {
227 wb->use = 0;
228 spin_unlock_irqrestore(&acm->write_lock, flags);
229 return -ENODEV;
230 }
231
232 dev_vdbg(&acm->data->dev, "%s - susp_count %d\n", __func__,
233 acm->susp_count);
234 usb_autopm_get_interface_async(acm->control);
235 if (acm->susp_count) {
236 if (!acm->delayed_wb)
237 acm->delayed_wb = wb;
238 else
239 usb_autopm_put_interface_async(acm->control);
240 spin_unlock_irqrestore(&acm->write_lock, flags);
241 return 0; /* A white lie */
242 }
243 usb_mark_last_busy(acm->dev);
244
245 rc = acm_start_wb(acm, wb);
246 spin_unlock_irqrestore(&acm->write_lock, flags);
247
248 return rc;
249
250 }
251 /*
252 * attributes exported through sysfs
253 */
254 static ssize_t show_caps
255 (struct device *dev, struct device_attribute *attr, char *buf)
256 {
257 struct usb_interface *intf = to_usb_interface(dev);
258 struct acm *acm = usb_get_intfdata(intf);
259
260 return sprintf(buf, "%d", acm->ctrl_caps);
261 }
262 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
263
264 static ssize_t show_country_codes
265 (struct device *dev, struct device_attribute *attr, char *buf)
266 {
267 struct usb_interface *intf = to_usb_interface(dev);
268 struct acm *acm = usb_get_intfdata(intf);
269
270 memcpy(buf, acm->country_codes, acm->country_code_size);
271 return acm->country_code_size;
272 }
273
274 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
275
276 static ssize_t show_country_rel_date
277 (struct device *dev, struct device_attribute *attr, char *buf)
278 {
279 struct usb_interface *intf = to_usb_interface(dev);
280 struct acm *acm = usb_get_intfdata(intf);
281
282 return sprintf(buf, "%d", acm->country_rel_date);
283 }
284
285 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
286 /*
287 * Interrupt handlers for various ACM device responses
288 */
289
290 /* control interface reports status changes with "interrupt" transfers */
291 static void acm_ctrl_irq(struct urb *urb)
292 {
293 struct acm *acm = urb->context;
294 struct usb_cdc_notification *dr = urb->transfer_buffer;
295 unsigned char *data;
296 int newctrl;
297 int retval;
298 int status = urb->status;
299
300 switch (status) {
301 case 0:
302 /* success */
303 break;
304 case -ECONNRESET:
305 case -ENOENT:
306 case -ESHUTDOWN:
307 /* this urb is terminated, clean up */
308 dev_dbg(&acm->control->dev,
309 "%s - urb shutting down with status: %d\n",
310 __func__, status);
311 return;
312 default:
313 dev_dbg(&acm->control->dev,
314 "%s - nonzero urb status received: %d\n",
315 __func__, status);
316 goto exit;
317 }
318
319 usb_mark_last_busy(acm->dev);
320
321 data = (unsigned char *)(dr + 1);
322 switch (dr->bNotificationType) {
323 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
324 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
325 __func__, dr->wValue);
326 break;
327
328 case USB_CDC_NOTIFY_SERIAL_STATE:
329 newctrl = get_unaligned_le16(data);
330
331 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
332 dev_dbg(&acm->control->dev, "%s - calling hangup\n",
333 __func__);
334 tty_port_tty_hangup(&acm->port, false);
335 }
336
337 acm->ctrlin = newctrl;
338
339 dev_dbg(&acm->control->dev,
340 "%s - input control lines: dcd%c dsr%c break%c "
341 "ring%c framing%c parity%c overrun%c\n",
342 __func__,
343 acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
344 acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
345 acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
346 acm->ctrlin & ACM_CTRL_RI ? '+' : '-',
347 acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
348 acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
349 acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
350 break;
351
352 default:
353 dev_dbg(&acm->control->dev,
354 "%s - unknown notification %d received: index %d "
355 "len %d data0 %d data1 %d\n",
356 __func__,
357 dr->bNotificationType, dr->wIndex,
358 dr->wLength, data[0], data[1]);
359 break;
360 }
361 exit:
362 retval = usb_submit_urb(urb, GFP_ATOMIC);
363 if (retval)
364 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
365 __func__, retval);
366 }
367
368 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
369 {
370 int res;
371
372 if (!test_and_clear_bit(index, &acm->read_urbs_free))
373 return 0;
374
375 dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
376
377 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
378 if (res) {
379 if (res != -EPERM) {
380 dev_err(&acm->data->dev,
381 "%s - usb_submit_urb failed: %d\n",
382 __func__, res);
383 }
384 set_bit(index, &acm->read_urbs_free);
385 return res;
386 }
387
388 return 0;
389 }
390
391 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
392 {
393 int res;
394 int i;
395
396 for (i = 0; i < acm->rx_buflimit; ++i) {
397 res = acm_submit_read_urb(acm, i, mem_flags);
398 if (res)
399 return res;
400 }
401
402 return 0;
403 }
404
405 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
406 {
407 if (!urb->actual_length)
408 return;
409
410 tty_insert_flip_string(&acm->port, urb->transfer_buffer,
411 urb->actual_length);
412 tty_flip_buffer_push(&acm->port);
413 }
414
415 static void acm_read_bulk_callback(struct urb *urb)
416 {
417 struct acm_rb *rb = urb->context;
418 struct acm *acm = rb->instance;
419 unsigned long flags;
420
421 dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
422 rb->index, urb->actual_length);
423 set_bit(rb->index, &acm->read_urbs_free);
424
425 if (!acm->dev) {
426 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
427 return;
428 }
429 usb_mark_last_busy(acm->dev);
430
431 if (urb->status) {
432 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
433 __func__, urb->status);
434 return;
435 }
436 acm_process_read_urb(acm, urb);
437
438 /* throttle device if requested by tty */
439 spin_lock_irqsave(&acm->read_lock, flags);
440 acm->throttled = acm->throttle_req;
441 if (!acm->throttled && !acm->susp_count) {
442 spin_unlock_irqrestore(&acm->read_lock, flags);
443 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
444 } else {
445 spin_unlock_irqrestore(&acm->read_lock, flags);
446 }
447 }
448
449 /* data interface wrote those outgoing bytes */
450 static void acm_write_bulk(struct urb *urb)
451 {
452 struct acm_wb *wb = urb->context;
453 struct acm *acm = wb->instance;
454 unsigned long flags;
455
456 if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
457 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
458 __func__,
459 urb->actual_length,
460 urb->transfer_buffer_length,
461 urb->status);
462
463 spin_lock_irqsave(&acm->write_lock, flags);
464 acm_write_done(acm, wb);
465 spin_unlock_irqrestore(&acm->write_lock, flags);
466 schedule_work(&acm->work);
467 }
468
469 static void acm_softint(struct work_struct *work)
470 {
471 struct acm *acm = container_of(work, struct acm, work);
472
473 dev_vdbg(&acm->data->dev, "%s\n", __func__);
474
475 tty_port_tty_wakeup(&acm->port);
476 }
477
478 /*
479 * TTY handlers
480 */
481
482 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
483 {
484 struct acm *acm;
485 int retval;
486
487 dev_dbg(tty->dev, "%s\n", __func__);
488
489 acm = acm_get_by_index(tty->index);
490 if (!acm)
491 return -ENODEV;
492
493 retval = tty_standard_install(driver, tty);
494 if (retval)
495 goto error_init_termios;
496
497 tty->driver_data = acm;
498
499 return 0;
500
501 error_init_termios:
502 tty_port_put(&acm->port);
503 return retval;
504 }
505
506 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
507 {
508 struct acm *acm = tty->driver_data;
509
510 dev_dbg(tty->dev, "%s\n", __func__);
511
512 return tty_port_open(&acm->port, tty, filp);
513 }
514
515 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
516 {
517 struct acm *acm = container_of(port, struct acm, port);
518 int retval = -ENODEV;
519
520 dev_dbg(&acm->control->dev, "%s\n", __func__);
521
522 mutex_lock(&acm->mutex);
523 if (acm->disconnected)
524 goto disconnected;
525
526 retval = usb_autopm_get_interface(acm->control);
527 if (retval)
528 goto error_get_interface;
529
530 /*
531 * FIXME: Why do we need this? Allocating 64K of physically contiguous
532 * memory is really nasty...
533 */
534 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
535 acm->control->needs_remote_wakeup = 1;
536
537 acm->ctrlurb->dev = acm->dev;
538 if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
539 dev_err(&acm->control->dev,
540 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
541 goto error_submit_urb;
542 }
543
544 acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
545 if (acm_set_control(acm, acm->ctrlout) < 0 &&
546 (acm->ctrl_caps & USB_CDC_CAP_LINE))
547 goto error_set_control;
548
549 usb_autopm_put_interface(acm->control);
550
551 /*
552 * Unthrottle device in case the TTY was closed while throttled.
553 */
554 spin_lock_irq(&acm->read_lock);
555 acm->throttled = 0;
556 acm->throttle_req = 0;
557 spin_unlock_irq(&acm->read_lock);
558
559 if (acm_submit_read_urbs(acm, GFP_KERNEL))
560 goto error_submit_read_urbs;
561
562 mutex_unlock(&acm->mutex);
563
564 return 0;
565
566 error_submit_read_urbs:
567 acm->ctrlout = 0;
568 acm_set_control(acm, acm->ctrlout);
569 error_set_control:
570 usb_kill_urb(acm->ctrlurb);
571 error_submit_urb:
572 usb_autopm_put_interface(acm->control);
573 error_get_interface:
574 disconnected:
575 mutex_unlock(&acm->mutex);
576 return retval;
577 }
578
579 static void acm_port_destruct(struct tty_port *port)
580 {
581 struct acm *acm = container_of(port, struct acm, port);
582
583 dev_dbg(&acm->control->dev, "%s\n", __func__);
584
585 acm_release_minor(acm);
586 usb_put_intf(acm->control);
587 kfree(acm->country_codes);
588 kfree(acm);
589 }
590
591 static void acm_port_shutdown(struct tty_port *port)
592 {
593 struct acm *acm = container_of(port, struct acm, port);
594 int i;
595
596 dev_dbg(&acm->control->dev, "%s\n", __func__);
597
598 mutex_lock(&acm->mutex);
599 if (!acm->disconnected) {
600 usb_autopm_get_interface(acm->control);
601 acm_set_control(acm, acm->ctrlout = 0);
602 usb_kill_urb(acm->ctrlurb);
603 for (i = 0; i < ACM_NW; i++)
604 usb_kill_urb(acm->wb[i].urb);
605 for (i = 0; i < acm->rx_buflimit; i++)
606 usb_kill_urb(acm->read_urbs[i]);
607 acm->control->needs_remote_wakeup = 0;
608 usb_autopm_put_interface(acm->control);
609 }
610 mutex_unlock(&acm->mutex);
611 }
612
613 static void acm_tty_cleanup(struct tty_struct *tty)
614 {
615 struct acm *acm = tty->driver_data;
616 dev_dbg(&acm->control->dev, "%s\n", __func__);
617 tty_port_put(&acm->port);
618 }
619
620 static void acm_tty_hangup(struct tty_struct *tty)
621 {
622 struct acm *acm = tty->driver_data;
623 dev_dbg(&acm->control->dev, "%s\n", __func__);
624 tty_port_hangup(&acm->port);
625 }
626
627 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
628 {
629 struct acm *acm = tty->driver_data;
630 dev_dbg(&acm->control->dev, "%s\n", __func__);
631 tty_port_close(&acm->port, tty, filp);
632 }
633
634 static int acm_tty_write(struct tty_struct *tty,
635 const unsigned char *buf, int count)
636 {
637 struct acm *acm = tty->driver_data;
638 int stat;
639 unsigned long flags;
640 int wbn;
641 struct acm_wb *wb;
642
643 if (!count)
644 return 0;
645
646 dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
647
648 spin_lock_irqsave(&acm->write_lock, flags);
649 wbn = acm_wb_alloc(acm);
650 if (wbn < 0) {
651 spin_unlock_irqrestore(&acm->write_lock, flags);
652 return 0;
653 }
654 wb = &acm->wb[wbn];
655
656 count = (count > acm->writesize) ? acm->writesize : count;
657 dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
658 memcpy(wb->buf, buf, count);
659 wb->len = count;
660 spin_unlock_irqrestore(&acm->write_lock, flags);
661
662 stat = acm_write_start(acm, wbn);
663 if (stat < 0)
664 return stat;
665 return count;
666 }
667
668 static int acm_tty_write_room(struct tty_struct *tty)
669 {
670 struct acm *acm = tty->driver_data;
671 /*
672 * Do not let the line discipline to know that we have a reserve,
673 * or it might get too enthusiastic.
674 */
675 return acm_wb_is_avail(acm) ? acm->writesize : 0;
676 }
677
678 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
679 {
680 struct acm *acm = tty->driver_data;
681 /*
682 * if the device was unplugged then any remaining characters fell out
683 * of the connector ;)
684 */
685 if (acm->disconnected)
686 return 0;
687 /*
688 * This is inaccurate (overcounts), but it works.
689 */
690 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
691 }
692
693 static void acm_tty_throttle(struct tty_struct *tty)
694 {
695 struct acm *acm = tty->driver_data;
696
697 spin_lock_irq(&acm->read_lock);
698 acm->throttle_req = 1;
699 spin_unlock_irq(&acm->read_lock);
700 }
701
702 static void acm_tty_unthrottle(struct tty_struct *tty)
703 {
704 struct acm *acm = tty->driver_data;
705 unsigned int was_throttled;
706
707 spin_lock_irq(&acm->read_lock);
708 was_throttled = acm->throttled;
709 acm->throttled = 0;
710 acm->throttle_req = 0;
711 spin_unlock_irq(&acm->read_lock);
712
713 if (was_throttled)
714 acm_submit_read_urbs(acm, GFP_KERNEL);
715 }
716
717 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
718 {
719 struct acm *acm = tty->driver_data;
720 int retval;
721
722 retval = acm_send_break(acm, state ? 0xffff : 0);
723 if (retval < 0)
724 dev_dbg(&acm->control->dev, "%s - send break failed\n",
725 __func__);
726 return retval;
727 }
728
729 static int acm_tty_tiocmget(struct tty_struct *tty)
730 {
731 struct acm *acm = tty->driver_data;
732
733 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
734 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
735 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
736 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
737 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
738 TIOCM_CTS;
739 }
740
741 static int acm_tty_tiocmset(struct tty_struct *tty,
742 unsigned int set, unsigned int clear)
743 {
744 struct acm *acm = tty->driver_data;
745 unsigned int newctrl;
746
747 newctrl = acm->ctrlout;
748 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
749 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
750 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
751 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
752
753 newctrl = (newctrl & ~clear) | set;
754
755 if (acm->ctrlout == newctrl)
756 return 0;
757 return acm_set_control(acm, acm->ctrlout = newctrl);
758 }
759
760 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
761 {
762 struct serial_struct tmp;
763
764 if (!info)
765 return -EINVAL;
766
767 memset(&tmp, 0, sizeof(tmp));
768 tmp.flags = ASYNC_LOW_LATENCY;
769 tmp.xmit_fifo_size = acm->writesize;
770 tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
771 tmp.close_delay = acm->port.close_delay / 10;
772 tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
773 ASYNC_CLOSING_WAIT_NONE :
774 acm->port.closing_wait / 10;
775
776 if (copy_to_user(info, &tmp, sizeof(tmp)))
777 return -EFAULT;
778 else
779 return 0;
780 }
781
782 static int set_serial_info(struct acm *acm,
783 struct serial_struct __user *newinfo)
784 {
785 struct serial_struct new_serial;
786 unsigned int closing_wait, close_delay;
787 int retval = 0;
788
789 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
790 return -EFAULT;
791
792 close_delay = new_serial.close_delay * 10;
793 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
794 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
795
796 mutex_lock(&acm->port.mutex);
797
798 if (!capable(CAP_SYS_ADMIN)) {
799 if ((close_delay != acm->port.close_delay) ||
800 (closing_wait != acm->port.closing_wait))
801 retval = -EPERM;
802 else
803 retval = -EOPNOTSUPP;
804 } else {
805 acm->port.close_delay = close_delay;
806 acm->port.closing_wait = closing_wait;
807 }
808
809 mutex_unlock(&acm->port.mutex);
810 return retval;
811 }
812
813 static int acm_tty_ioctl(struct tty_struct *tty,
814 unsigned int cmd, unsigned long arg)
815 {
816 struct acm *acm = tty->driver_data;
817 int rv = -ENOIOCTLCMD;
818
819 switch (cmd) {
820 case TIOCGSERIAL: /* gets serial port data */
821 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
822 break;
823 case TIOCSSERIAL:
824 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
825 break;
826 }
827
828 return rv;
829 }
830
831 static void acm_tty_set_termios(struct tty_struct *tty,
832 struct ktermios *termios_old)
833 {
834 struct acm *acm = tty->driver_data;
835 struct ktermios *termios = &tty->termios;
836 struct usb_cdc_line_coding newline;
837 int newctrl = acm->ctrlout;
838
839 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
840 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
841 newline.bParityType = termios->c_cflag & PARENB ?
842 (termios->c_cflag & PARODD ? 1 : 2) +
843 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
844 switch (termios->c_cflag & CSIZE) {
845 case CS5:
846 newline.bDataBits = 5;
847 break;
848 case CS6:
849 newline.bDataBits = 6;
850 break;
851 case CS7:
852 newline.bDataBits = 7;
853 break;
854 case CS8:
855 default:
856 newline.bDataBits = 8;
857 break;
858 }
859 /* FIXME: Needs to clear unsupported bits in the termios */
860 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
861
862 if (!newline.dwDTERate) {
863 newline.dwDTERate = acm->line.dwDTERate;
864 newctrl &= ~ACM_CTRL_DTR;
865 } else
866 newctrl |= ACM_CTRL_DTR;
867
868 if (newctrl != acm->ctrlout)
869 acm_set_control(acm, acm->ctrlout = newctrl);
870
871 if (memcmp(&acm->line, &newline, sizeof newline)) {
872 memcpy(&acm->line, &newline, sizeof newline);
873 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
874 __func__,
875 le32_to_cpu(newline.dwDTERate),
876 newline.bCharFormat, newline.bParityType,
877 newline.bDataBits);
878 acm_set_line(acm, &acm->line);
879 }
880 }
881
882 static const struct tty_port_operations acm_port_ops = {
883 .shutdown = acm_port_shutdown,
884 .activate = acm_port_activate,
885 .destruct = acm_port_destruct,
886 };
887
888 /*
889 * USB probe and disconnect routines.
890 */
891
892 /* Little helpers: write/read buffers free */
893 static void acm_write_buffers_free(struct acm *acm)
894 {
895 int i;
896 struct acm_wb *wb;
897 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
898
899 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
900 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
901 }
902
903 static void acm_read_buffers_free(struct acm *acm)
904 {
905 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
906 int i;
907
908 for (i = 0; i < acm->rx_buflimit; i++)
909 usb_free_coherent(usb_dev, acm->readsize,
910 acm->read_buffers[i].base, acm->read_buffers[i].dma);
911 }
912
913 /* Little helper: write buffers allocate */
914 static int acm_write_buffers_alloc(struct acm *acm)
915 {
916 int i;
917 struct acm_wb *wb;
918
919 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
920 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
921 &wb->dmah);
922 if (!wb->buf) {
923 while (i != 0) {
924 --i;
925 --wb;
926 usb_free_coherent(acm->dev, acm->writesize,
927 wb->buf, wb->dmah);
928 }
929 return -ENOMEM;
930 }
931 }
932 return 0;
933 }
934
935 static int acm_probe(struct usb_interface *intf,
936 const struct usb_device_id *id)
937 {
938 struct usb_cdc_union_desc *union_header = NULL;
939 struct usb_cdc_country_functional_desc *cfd = NULL;
940 unsigned char *buffer = intf->altsetting->extra;
941 int buflen = intf->altsetting->extralen;
942 struct usb_interface *control_interface;
943 struct usb_interface *data_interface;
944 struct usb_endpoint_descriptor *epctrl = NULL;
945 struct usb_endpoint_descriptor *epread = NULL;
946 struct usb_endpoint_descriptor *epwrite = NULL;
947 struct usb_device *usb_dev = interface_to_usbdev(intf);
948 struct acm *acm;
949 int minor;
950 int ctrlsize, readsize;
951 u8 *buf;
952 u8 ac_management_function = 0;
953 u8 call_management_function = 0;
954 int call_interface_num = -1;
955 int data_interface_num = -1;
956 unsigned long quirks;
957 int num_rx_buf;
958 int i;
959 int combined_interfaces = 0;
960 struct device *tty_dev;
961 int rv = -ENOMEM;
962
963 /* normal quirks */
964 quirks = (unsigned long)id->driver_info;
965
966 if (quirks == IGNORE_DEVICE)
967 return -ENODEV;
968
969 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
970
971 /* handle quirks deadly to normal probing*/
972 if (quirks == NO_UNION_NORMAL) {
973 data_interface = usb_ifnum_to_if(usb_dev, 1);
974 control_interface = usb_ifnum_to_if(usb_dev, 0);
975 goto skip_normal_probe;
976 }
977
978 /* normal probing*/
979 if (!buffer) {
980 dev_err(&intf->dev, "Weird descriptor references\n");
981 return -EINVAL;
982 }
983
984 if (!buflen) {
985 if (intf->cur_altsetting->endpoint &&
986 intf->cur_altsetting->endpoint->extralen &&
987 intf->cur_altsetting->endpoint->extra) {
988 dev_dbg(&intf->dev,
989 "Seeking extra descriptors on endpoint\n");
990 buflen = intf->cur_altsetting->endpoint->extralen;
991 buffer = intf->cur_altsetting->endpoint->extra;
992 } else {
993 dev_err(&intf->dev,
994 "Zero length descriptor references\n");
995 return -EINVAL;
996 }
997 }
998
999 while (buflen > 0) {
1000 if (buffer[1] != USB_DT_CS_INTERFACE) {
1001 dev_err(&intf->dev, "skipping garbage\n");
1002 goto next_desc;
1003 }
1004
1005 switch (buffer[2]) {
1006 case USB_CDC_UNION_TYPE: /* we've found it */
1007 if (union_header) {
1008 dev_err(&intf->dev, "More than one "
1009 "union descriptor, skipping ...\n");
1010 goto next_desc;
1011 }
1012 union_header = (struct usb_cdc_union_desc *)buffer;
1013 break;
1014 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1015 cfd = (struct usb_cdc_country_functional_desc *)buffer;
1016 break;
1017 case USB_CDC_HEADER_TYPE: /* maybe check version */
1018 break; /* for now we ignore it */
1019 case USB_CDC_ACM_TYPE:
1020 ac_management_function = buffer[3];
1021 break;
1022 case USB_CDC_CALL_MANAGEMENT_TYPE:
1023 call_management_function = buffer[3];
1024 call_interface_num = buffer[4];
1025 if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1026 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1027 break;
1028 default:
1029 /* there are LOTS more CDC descriptors that
1030 * could legitimately be found here.
1031 */
1032 dev_dbg(&intf->dev, "Ignoring descriptor: "
1033 "type %02x, length %d\n",
1034 buffer[2], buffer[0]);
1035 break;
1036 }
1037 next_desc:
1038 buflen -= buffer[0];
1039 buffer += buffer[0];
1040 }
1041
1042 if (!union_header) {
1043 if (call_interface_num > 0) {
1044 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1045 /* quirks for Droids MuIn LCD */
1046 if (quirks & NO_DATA_INTERFACE)
1047 data_interface = usb_ifnum_to_if(usb_dev, 0);
1048 else
1049 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1050 control_interface = intf;
1051 } else {
1052 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1053 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1054 return -ENODEV;
1055 } else {
1056 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1057 combined_interfaces = 1;
1058 control_interface = data_interface = intf;
1059 goto look_for_collapsed_interface;
1060 }
1061 }
1062 } else {
1063 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1064 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1065 if (!control_interface || !data_interface) {
1066 dev_dbg(&intf->dev, "no interfaces\n");
1067 return -ENODEV;
1068 }
1069 }
1070
1071 if (data_interface_num != call_interface_num)
1072 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1073
1074 if (control_interface == data_interface) {
1075 /* some broken devices designed for windows work this way */
1076 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1077 combined_interfaces = 1;
1078 /* a popular other OS doesn't use it */
1079 quirks |= NO_CAP_LINE;
1080 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1081 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1082 return -EINVAL;
1083 }
1084 look_for_collapsed_interface:
1085 for (i = 0; i < 3; i++) {
1086 struct usb_endpoint_descriptor *ep;
1087 ep = &data_interface->cur_altsetting->endpoint[i].desc;
1088
1089 if (usb_endpoint_is_int_in(ep))
1090 epctrl = ep;
1091 else if (usb_endpoint_is_bulk_out(ep))
1092 epwrite = ep;
1093 else if (usb_endpoint_is_bulk_in(ep))
1094 epread = ep;
1095 else
1096 return -EINVAL;
1097 }
1098 if (!epctrl || !epread || !epwrite)
1099 return -ENODEV;
1100 else
1101 goto made_compressed_probe;
1102 }
1103
1104 skip_normal_probe:
1105
1106 /*workaround for switched interfaces */
1107 if (data_interface->cur_altsetting->desc.bInterfaceClass
1108 != CDC_DATA_INTERFACE_TYPE) {
1109 if (control_interface->cur_altsetting->desc.bInterfaceClass
1110 == CDC_DATA_INTERFACE_TYPE) {
1111 struct usb_interface *t;
1112 dev_dbg(&intf->dev,
1113 "Your device has switched interfaces.\n");
1114 t = control_interface;
1115 control_interface = data_interface;
1116 data_interface = t;
1117 } else {
1118 return -EINVAL;
1119 }
1120 }
1121
1122 /* Accept probe requests only for the control interface */
1123 if (!combined_interfaces && intf != control_interface)
1124 return -ENODEV;
1125
1126 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1127 /* valid in this context */
1128 dev_dbg(&intf->dev, "The data interface isn't available\n");
1129 return -EBUSY;
1130 }
1131
1132
1133 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1134 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1135 return -EINVAL;
1136
1137 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1138 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1139 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1140
1141
1142 /* workaround for switched endpoints */
1143 if (!usb_endpoint_dir_in(epread)) {
1144 /* descriptors are swapped */
1145 struct usb_endpoint_descriptor *t;
1146 dev_dbg(&intf->dev,
1147 "The data interface has switched endpoints\n");
1148 t = epread;
1149 epread = epwrite;
1150 epwrite = t;
1151 }
1152 made_compressed_probe:
1153 dev_dbg(&intf->dev, "interfaces are valid\n");
1154
1155 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1156 if (acm == NULL) {
1157 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1158 goto alloc_fail;
1159 }
1160
1161 minor = acm_alloc_minor(acm);
1162 if (minor == ACM_TTY_MINORS) {
1163 dev_err(&intf->dev, "no more free acm devices\n");
1164 kfree(acm);
1165 return -ENODEV;
1166 }
1167
1168 ctrlsize = usb_endpoint_maxp(epctrl);
1169 readsize = usb_endpoint_maxp(epread) *
1170 (quirks == SINGLE_RX_URB ? 1 : 2);
1171 acm->combined_interfaces = combined_interfaces;
1172 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1173 acm->control = control_interface;
1174 acm->data = data_interface;
1175 acm->minor = minor;
1176 acm->dev = usb_dev;
1177 acm->ctrl_caps = ac_management_function;
1178 if (quirks & NO_CAP_LINE)
1179 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1180 acm->ctrlsize = ctrlsize;
1181 acm->readsize = readsize;
1182 acm->rx_buflimit = num_rx_buf;
1183 INIT_WORK(&acm->work, acm_softint);
1184 spin_lock_init(&acm->write_lock);
1185 spin_lock_init(&acm->read_lock);
1186 mutex_init(&acm->mutex);
1187 acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1188 acm->is_int_ep = usb_endpoint_xfer_int(epread);
1189 if (acm->is_int_ep)
1190 acm->bInterval = epread->bInterval;
1191 tty_port_init(&acm->port);
1192 acm->port.ops = &acm_port_ops;
1193
1194 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1195 if (!buf) {
1196 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1197 goto alloc_fail2;
1198 }
1199 acm->ctrl_buffer = buf;
1200
1201 if (acm_write_buffers_alloc(acm) < 0) {
1202 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1203 goto alloc_fail4;
1204 }
1205
1206 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1207 if (!acm->ctrlurb) {
1208 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1209 goto alloc_fail5;
1210 }
1211 for (i = 0; i < num_rx_buf; i++) {
1212 struct acm_rb *rb = &(acm->read_buffers[i]);
1213 struct urb *urb;
1214
1215 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1216 &rb->dma);
1217 if (!rb->base) {
1218 dev_err(&intf->dev, "out of memory "
1219 "(read bufs usb_alloc_coherent)\n");
1220 goto alloc_fail6;
1221 }
1222 rb->index = i;
1223 rb->instance = acm;
1224
1225 urb = usb_alloc_urb(0, GFP_KERNEL);
1226 if (!urb) {
1227 dev_err(&intf->dev,
1228 "out of memory (read urbs usb_alloc_urb)\n");
1229 goto alloc_fail6;
1230 }
1231 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1232 urb->transfer_dma = rb->dma;
1233 if (acm->is_int_ep) {
1234 usb_fill_int_urb(urb, acm->dev,
1235 acm->rx_endpoint,
1236 rb->base,
1237 acm->readsize,
1238 acm_read_bulk_callback, rb,
1239 acm->bInterval);
1240 } else {
1241 usb_fill_bulk_urb(urb, acm->dev,
1242 acm->rx_endpoint,
1243 rb->base,
1244 acm->readsize,
1245 acm_read_bulk_callback, rb);
1246 }
1247
1248 acm->read_urbs[i] = urb;
1249 __set_bit(i, &acm->read_urbs_free);
1250 }
1251 for (i = 0; i < ACM_NW; i++) {
1252 struct acm_wb *snd = &(acm->wb[i]);
1253
1254 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1255 if (snd->urb == NULL) {
1256 dev_err(&intf->dev,
1257 "out of memory (write urbs usb_alloc_urb)\n");
1258 goto alloc_fail7;
1259 }
1260
1261 if (usb_endpoint_xfer_int(epwrite))
1262 usb_fill_int_urb(snd->urb, usb_dev,
1263 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1264 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1265 else
1266 usb_fill_bulk_urb(snd->urb, usb_dev,
1267 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1268 NULL, acm->writesize, acm_write_bulk, snd);
1269 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1270 snd->instance = acm;
1271 }
1272
1273 usb_set_intfdata(intf, acm);
1274
1275 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1276 if (i < 0)
1277 goto alloc_fail7;
1278
1279 if (cfd) { /* export the country data */
1280 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1281 if (!acm->country_codes)
1282 goto skip_countries;
1283 acm->country_code_size = cfd->bLength - 4;
1284 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1285 cfd->bLength - 4);
1286 acm->country_rel_date = cfd->iCountryCodeRelDate;
1287
1288 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1289 if (i < 0) {
1290 kfree(acm->country_codes);
1291 acm->country_codes = NULL;
1292 acm->country_code_size = 0;
1293 goto skip_countries;
1294 }
1295
1296 i = device_create_file(&intf->dev,
1297 &dev_attr_iCountryCodeRelDate);
1298 if (i < 0) {
1299 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1300 kfree(acm->country_codes);
1301 acm->country_codes = NULL;
1302 acm->country_code_size = 0;
1303 goto skip_countries;
1304 }
1305 }
1306
1307 skip_countries:
1308 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1309 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1310 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1311 /* works around buggy devices */
1312 epctrl->bInterval ? epctrl->bInterval : 0xff);
1313 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1314 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1315
1316 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1317
1318 acm_set_control(acm, acm->ctrlout);
1319
1320 acm->line.dwDTERate = cpu_to_le32(9600);
1321 acm->line.bDataBits = 8;
1322 acm_set_line(acm, &acm->line);
1323
1324 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1325 usb_set_intfdata(data_interface, acm);
1326
1327 usb_get_intf(control_interface);
1328 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1329 &control_interface->dev);
1330 if (IS_ERR(tty_dev)) {
1331 rv = PTR_ERR(tty_dev);
1332 goto alloc_fail8;
1333 }
1334
1335 return 0;
1336 alloc_fail8:
1337 if (acm->country_codes) {
1338 device_remove_file(&acm->control->dev,
1339 &dev_attr_wCountryCodes);
1340 device_remove_file(&acm->control->dev,
1341 &dev_attr_iCountryCodeRelDate);
1342 }
1343 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1344 alloc_fail7:
1345 usb_set_intfdata(intf, NULL);
1346 for (i = 0; i < ACM_NW; i++)
1347 usb_free_urb(acm->wb[i].urb);
1348 alloc_fail6:
1349 for (i = 0; i < num_rx_buf; i++)
1350 usb_free_urb(acm->read_urbs[i]);
1351 acm_read_buffers_free(acm);
1352 usb_free_urb(acm->ctrlurb);
1353 alloc_fail5:
1354 acm_write_buffers_free(acm);
1355 alloc_fail4:
1356 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1357 alloc_fail2:
1358 acm_release_minor(acm);
1359 kfree(acm);
1360 alloc_fail:
1361 return rv;
1362 }
1363
1364 static void stop_data_traffic(struct acm *acm)
1365 {
1366 int i;
1367
1368 dev_dbg(&acm->control->dev, "%s\n", __func__);
1369
1370 usb_kill_urb(acm->ctrlurb);
1371 for (i = 0; i < ACM_NW; i++)
1372 usb_kill_urb(acm->wb[i].urb);
1373 for (i = 0; i < acm->rx_buflimit; i++)
1374 usb_kill_urb(acm->read_urbs[i]);
1375
1376 cancel_work_sync(&acm->work);
1377 }
1378
1379 static void acm_disconnect(struct usb_interface *intf)
1380 {
1381 struct acm *acm = usb_get_intfdata(intf);
1382 struct usb_device *usb_dev = interface_to_usbdev(intf);
1383 struct tty_struct *tty;
1384 int i;
1385
1386 dev_dbg(&intf->dev, "%s\n", __func__);
1387
1388 /* sibling interface is already cleaning up */
1389 if (!acm)
1390 return;
1391
1392 mutex_lock(&acm->mutex);
1393 acm->disconnected = true;
1394 if (acm->country_codes) {
1395 device_remove_file(&acm->control->dev,
1396 &dev_attr_wCountryCodes);
1397 device_remove_file(&acm->control->dev,
1398 &dev_attr_iCountryCodeRelDate);
1399 }
1400 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1401 usb_set_intfdata(acm->control, NULL);
1402 usb_set_intfdata(acm->data, NULL);
1403 mutex_unlock(&acm->mutex);
1404
1405 tty = tty_port_tty_get(&acm->port);
1406 if (tty) {
1407 tty_vhangup(tty);
1408 tty_kref_put(tty);
1409 }
1410
1411 stop_data_traffic(acm);
1412
1413 tty_unregister_device(acm_tty_driver, acm->minor);
1414
1415 usb_free_urb(acm->ctrlurb);
1416 for (i = 0; i < ACM_NW; i++)
1417 usb_free_urb(acm->wb[i].urb);
1418 for (i = 0; i < acm->rx_buflimit; i++)
1419 usb_free_urb(acm->read_urbs[i]);
1420 acm_write_buffers_free(acm);
1421 usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1422 acm_read_buffers_free(acm);
1423
1424 if (!acm->combined_interfaces)
1425 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1426 acm->data : acm->control);
1427
1428 tty_port_put(&acm->port);
1429 }
1430
1431 #ifdef CONFIG_PM
1432 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1433 {
1434 struct acm *acm = usb_get_intfdata(intf);
1435 int cnt;
1436
1437 spin_lock_irq(&acm->read_lock);
1438 spin_lock(&acm->write_lock);
1439 if (PMSG_IS_AUTO(message)) {
1440 if (acm->transmitting) {
1441 spin_unlock(&acm->write_lock);
1442 spin_unlock_irq(&acm->read_lock);
1443 return -EBUSY;
1444 }
1445 }
1446 cnt = acm->susp_count++;
1447 spin_unlock(&acm->write_lock);
1448 spin_unlock_irq(&acm->read_lock);
1449
1450 if (cnt)
1451 return 0;
1452
1453 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1454 stop_data_traffic(acm);
1455
1456 return 0;
1457 }
1458
1459 static int acm_resume(struct usb_interface *intf)
1460 {
1461 struct acm *acm = usb_get_intfdata(intf);
1462 struct acm_wb *wb;
1463 int rv = 0;
1464
1465 spin_lock_irq(&acm->read_lock);
1466 spin_lock(&acm->write_lock);
1467
1468 if (--acm->susp_count)
1469 goto out;
1470
1471 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1472 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1473
1474 if (acm->delayed_wb) {
1475 wb = acm->delayed_wb;
1476 acm->delayed_wb = NULL;
1477 acm_start_wb(acm, wb);
1478 }
1479
1480 /*
1481 * delayed error checking because we must
1482 * do the write path at all cost
1483 */
1484 if (rv < 0)
1485 goto out;
1486
1487 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1488 }
1489 out:
1490 spin_unlock(&acm->write_lock);
1491 spin_unlock_irq(&acm->read_lock);
1492
1493 return rv;
1494 }
1495
1496 static int acm_reset_resume(struct usb_interface *intf)
1497 {
1498 struct acm *acm = usb_get_intfdata(intf);
1499
1500 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1501 tty_port_tty_hangup(&acm->port, false);
1502
1503 return acm_resume(intf);
1504 }
1505
1506 #endif /* CONFIG_PM */
1507
1508 #define NOKIA_PCSUITE_ACM_INFO(x) \
1509 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1510 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1511 USB_CDC_ACM_PROTO_VENDOR)
1512
1513 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1514 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1515 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1516 USB_CDC_ACM_PROTO_VENDOR)
1517
1518 /*
1519 * USB driver structure.
1520 */
1521
1522 static const struct usb_device_id acm_ids[] = {
1523 /* quirky and broken devices */
1524 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1525 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1526 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1527 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1528 },
1529 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1530 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1531 },
1532 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1533 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1534 },
1535 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1536 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1537 },
1538 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1539 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1540 },
1541 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1542 .driver_info = SINGLE_RX_URB,
1543 },
1544 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1545 .driver_info = SINGLE_RX_URB, /* firmware bug */
1546 },
1547 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1548 .driver_info = SINGLE_RX_URB, /* firmware bug */
1549 },
1550 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1551 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1552 },
1553 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1554 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1555 },
1556 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1557 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1558 },
1559 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1560 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1561 },
1562 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1563 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1564 },
1565 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1566 },
1567 /* Motorola H24 HSPA module: */
1568 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1569 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1570 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1571 },
1572 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1573 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1574 },
1575 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1576 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1577 },
1578 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1579 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1580 },
1581 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1582 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1583 },
1584 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1585 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1586 },
1587 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1588 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1589 },
1590
1591 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1592 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1593 data interface instead of
1594 communications interface.
1595 Maybe we should define a new
1596 quirk for this. */
1597 },
1598 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1599 .driver_info = NO_UNION_NORMAL,
1600 },
1601 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1602 .driver_info = NO_UNION_NORMAL,
1603 },
1604 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1605 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1606 },
1607 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1608 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1609 },
1610
1611 /* Nokia S60 phones expose two ACM channels. The first is
1612 * a modem and is picked up by the standard AT-command
1613 * information below. The second is 'vendor-specific' but
1614 * is treated as a serial device at the S60 end, so we want
1615 * to expose it on Linux too. */
1616 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1617 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1618 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1619 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1620 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1621 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1622 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1623 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1624 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1625 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1626 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1627 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1628 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1629 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1630 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1631 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1632 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1633 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1634 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1635 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1636 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1637 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1638 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1639 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1640 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1641 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1642 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1643 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1644 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1645 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1646 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1647 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1648 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1649 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1650 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1651 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1652 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1653 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1654 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1655 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1656 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1657 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1658 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1659 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1660 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1661 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1662 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1663 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1664 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1665 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1666 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1667 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1668 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1669 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1670 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1671 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1672 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1673 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1674
1675 /* Support for Owen devices */
1676 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1677
1678 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1679
1680 /* Support Lego NXT using pbLua firmware */
1681 { USB_DEVICE(0x0694, 0xff00),
1682 .driver_info = NOT_A_MODEM,
1683 },
1684
1685 /* Support for Droids MuIn LCD */
1686 { USB_DEVICE(0x04d8, 0x000b),
1687 .driver_info = NO_DATA_INTERFACE,
1688 },
1689
1690 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1691 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1692 .driver_info = IGNORE_DEVICE,
1693 },
1694 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1695 .driver_info = IGNORE_DEVICE,
1696 },
1697 #endif
1698
1699 /* control interfaces without any protocol set */
1700 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1701 USB_CDC_PROTO_NONE) },
1702
1703 /* control interfaces with various AT-command sets */
1704 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1705 USB_CDC_ACM_PROTO_AT_V25TER) },
1706 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1707 USB_CDC_ACM_PROTO_AT_PCCA101) },
1708 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1709 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1710 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1711 USB_CDC_ACM_PROTO_AT_GSM) },
1712 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1713 USB_CDC_ACM_PROTO_AT_3G) },
1714 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1715 USB_CDC_ACM_PROTO_AT_CDMA) },
1716
1717 { }
1718 };
1719
1720 MODULE_DEVICE_TABLE(usb, acm_ids);
1721
1722 static struct usb_driver acm_driver = {
1723 .name = "cdc_acm",
1724 .probe = acm_probe,
1725 .disconnect = acm_disconnect,
1726 #ifdef CONFIG_PM
1727 .suspend = acm_suspend,
1728 .resume = acm_resume,
1729 .reset_resume = acm_reset_resume,
1730 #endif
1731 .id_table = acm_ids,
1732 #ifdef CONFIG_PM
1733 .supports_autosuspend = 1,
1734 #endif
1735 .disable_hub_initiated_lpm = 1,
1736 };
1737
1738 /*
1739 * TTY driver structures.
1740 */
1741
1742 static const struct tty_operations acm_ops = {
1743 .install = acm_tty_install,
1744 .open = acm_tty_open,
1745 .close = acm_tty_close,
1746 .cleanup = acm_tty_cleanup,
1747 .hangup = acm_tty_hangup,
1748 .write = acm_tty_write,
1749 .write_room = acm_tty_write_room,
1750 .ioctl = acm_tty_ioctl,
1751 .throttle = acm_tty_throttle,
1752 .unthrottle = acm_tty_unthrottle,
1753 .chars_in_buffer = acm_tty_chars_in_buffer,
1754 .break_ctl = acm_tty_break_ctl,
1755 .set_termios = acm_tty_set_termios,
1756 .tiocmget = acm_tty_tiocmget,
1757 .tiocmset = acm_tty_tiocmset,
1758 };
1759
1760 /*
1761 * Init / exit.
1762 */
1763
1764 static int __init acm_init(void)
1765 {
1766 int retval;
1767 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1768 if (!acm_tty_driver)
1769 return -ENOMEM;
1770 acm_tty_driver->driver_name = "acm",
1771 acm_tty_driver->name = "ttyACM",
1772 acm_tty_driver->major = ACM_TTY_MAJOR,
1773 acm_tty_driver->minor_start = 0,
1774 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1775 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1776 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1777 acm_tty_driver->init_termios = tty_std_termios;
1778 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1779 HUPCL | CLOCAL;
1780 tty_set_operations(acm_tty_driver, &acm_ops);
1781
1782 retval = tty_register_driver(acm_tty_driver);
1783 if (retval) {
1784 put_tty_driver(acm_tty_driver);
1785 return retval;
1786 }
1787
1788 retval = usb_register(&acm_driver);
1789 if (retval) {
1790 tty_unregister_driver(acm_tty_driver);
1791 put_tty_driver(acm_tty_driver);
1792 return retval;
1793 }
1794
1795 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1796
1797 return 0;
1798 }
1799
1800 static void __exit acm_exit(void)
1801 {
1802 usb_deregister(&acm_driver);
1803 tty_unregister_driver(acm_tty_driver);
1804 put_tty_driver(acm_tty_driver);
1805 }
1806
1807 module_init(acm_init);
1808 module_exit(acm_exit);
1809
1810 MODULE_AUTHOR(DRIVER_AUTHOR);
1811 MODULE_DESCRIPTION(DRIVER_DESC);
1812 MODULE_LICENSE("GPL");
1813 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
kernel source for telekom puls (alcatel/mediatek)