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Linux 3.10.107
[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;
126
127 retval = usb_autopm_get_interface(acm->control);
128 if (retval)
129 return retval;
130
131 retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
132 request, USB_RT_ACM, value,
133 acm->control->altsetting[0].desc.bInterfaceNumber,
134 buf, len, 5000);
135
136 dev_dbg(&acm->control->dev,
137 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
138 __func__, request, value, len, retval);
139
140 usb_autopm_put_interface(acm->control);
141
142 return retval < 0 ? retval : 0;
143 }
144
145 /* devices aren't required to support these requests.
146 * the cdc acm descriptor tells whether they do...
147 */
148 #define acm_set_control(acm, control) \
149 acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
150 #define acm_set_line(acm, line) \
151 acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
152 #define acm_send_break(acm, ms) \
153 acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
154
155 /*
156 * Write buffer management.
157 * All of these assume proper locks taken by the caller.
158 */
159
160 static int acm_wb_alloc(struct acm *acm)
161 {
162 int i, wbn;
163 struct acm_wb *wb;
164
165 wbn = 0;
166 i = 0;
167 for (;;) {
168 wb = &acm->wb[wbn];
169 if (!wb->use) {
170 wb->use = 1;
171 return wbn;
172 }
173 wbn = (wbn + 1) % ACM_NW;
174 if (++i >= ACM_NW)
175 return -1;
176 }
177 }
178
179 static int acm_wb_is_avail(struct acm *acm)
180 {
181 int i, n;
182 unsigned long flags;
183
184 n = ACM_NW;
185 spin_lock_irqsave(&acm->write_lock, flags);
186 for (i = 0; i < ACM_NW; i++)
187 n -= acm->wb[i].use;
188 spin_unlock_irqrestore(&acm->write_lock, flags);
189 return n;
190 }
191
192 /*
193 * Finish write. Caller must hold acm->write_lock
194 */
195 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
196 {
197 wb->use = 0;
198 acm->transmitting--;
199 usb_autopm_put_interface_async(acm->control);
200 }
201
202 /*
203 * Poke write.
204 *
205 * the caller is responsible for locking
206 */
207
208 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
209 {
210 int rc;
211
212 acm->transmitting++;
213
214 wb->urb->transfer_buffer = wb->buf;
215 wb->urb->transfer_dma = wb->dmah;
216 wb->urb->transfer_buffer_length = wb->len;
217 wb->urb->dev = acm->dev;
218
219 rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
220 if (rc < 0) {
221 dev_err(&acm->data->dev,
222 "%s - usb_submit_urb(write bulk) failed: %d\n",
223 __func__, rc);
224 acm_write_done(acm, wb);
225 }
226 return rc;
227 }
228
229 static int acm_write_start(struct acm *acm, int wbn)
230 {
231 unsigned long flags;
232 struct acm_wb *wb = &acm->wb[wbn];
233 int rc;
234
235 spin_lock_irqsave(&acm->write_lock, flags);
236 if (!acm->dev) {
237 wb->use = 0;
238 spin_unlock_irqrestore(&acm->write_lock, flags);
239 return -ENODEV;
240 }
241
242 dev_vdbg(&acm->data->dev, "%s - susp_count %d\n", __func__,
243 acm->susp_count);
244 usb_autopm_get_interface_async(acm->control);
245 if (acm->susp_count) {
246 usb_anchor_urb(wb->urb, &acm->delayed);
247 spin_unlock_irqrestore(&acm->write_lock, flags);
248 return 0;
249 }
250 usb_mark_last_busy(acm->dev);
251
252 rc = acm_start_wb(acm, wb);
253 spin_unlock_irqrestore(&acm->write_lock, flags);
254
255 return rc;
256
257 }
258 /*
259 * attributes exported through sysfs
260 */
261 static ssize_t show_caps
262 (struct device *dev, struct device_attribute *attr, char *buf)
263 {
264 struct usb_interface *intf = to_usb_interface(dev);
265 struct acm *acm = usb_get_intfdata(intf);
266
267 return sprintf(buf, "%d", acm->ctrl_caps);
268 }
269 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
270
271 static ssize_t show_country_codes
272 (struct device *dev, struct device_attribute *attr, char *buf)
273 {
274 struct usb_interface *intf = to_usb_interface(dev);
275 struct acm *acm = usb_get_intfdata(intf);
276
277 memcpy(buf, acm->country_codes, acm->country_code_size);
278 return acm->country_code_size;
279 }
280
281 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
282
283 static ssize_t show_country_rel_date
284 (struct device *dev, struct device_attribute *attr, char *buf)
285 {
286 struct usb_interface *intf = to_usb_interface(dev);
287 struct acm *acm = usb_get_intfdata(intf);
288
289 return sprintf(buf, "%d", acm->country_rel_date);
290 }
291
292 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
293 /*
294 * Interrupt handlers for various ACM device responses
295 */
296
297 /* control interface reports status changes with "interrupt" transfers */
298 static void acm_ctrl_irq(struct urb *urb)
299 {
300 struct acm *acm = urb->context;
301 struct usb_cdc_notification *dr = urb->transfer_buffer;
302 unsigned char *data;
303 int newctrl;
304 int retval;
305 int status = urb->status;
306
307 switch (status) {
308 case 0:
309 /* success */
310 break;
311 case -ECONNRESET:
312 case -ENOENT:
313 case -ESHUTDOWN:
314 /* this urb is terminated, clean up */
315 dev_dbg(&acm->control->dev,
316 "%s - urb shutting down with status: %d\n",
317 __func__, status);
318 return;
319 default:
320 dev_dbg(&acm->control->dev,
321 "%s - nonzero urb status received: %d\n",
322 __func__, status);
323 goto exit;
324 }
325
326 usb_mark_last_busy(acm->dev);
327
328 data = (unsigned char *)(dr + 1);
329 switch (dr->bNotificationType) {
330 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
331 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
332 __func__, dr->wValue);
333 break;
334
335 case USB_CDC_NOTIFY_SERIAL_STATE:
336 newctrl = get_unaligned_le16(data);
337
338 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
339 dev_dbg(&acm->control->dev, "%s - calling hangup\n",
340 __func__);
341 tty_port_tty_hangup(&acm->port, false);
342 }
343
344 acm->ctrlin = newctrl;
345
346 dev_dbg(&acm->control->dev,
347 "%s - input control lines: dcd%c dsr%c break%c "
348 "ring%c framing%c parity%c overrun%c\n",
349 __func__,
350 acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
351 acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
352 acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
353 acm->ctrlin & ACM_CTRL_RI ? '+' : '-',
354 acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
355 acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
356 acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
357 break;
358
359 default:
360 dev_dbg(&acm->control->dev,
361 "%s - unknown notification %d received: index %d "
362 "len %d data0 %d data1 %d\n",
363 __func__,
364 dr->bNotificationType, dr->wIndex,
365 dr->wLength, data[0], data[1]);
366 break;
367 }
368 exit:
369 retval = usb_submit_urb(urb, GFP_ATOMIC);
370 if (retval)
371 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
372 __func__, retval);
373 }
374
375 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
376 {
377 int res;
378
379 if (!test_and_clear_bit(index, &acm->read_urbs_free))
380 return 0;
381
382 dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
383
384 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
385 if (res) {
386 if (res != -EPERM) {
387 dev_err(&acm->data->dev,
388 "%s - usb_submit_urb failed: %d\n",
389 __func__, res);
390 }
391 set_bit(index, &acm->read_urbs_free);
392 return res;
393 }
394
395 return 0;
396 }
397
398 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
399 {
400 int res;
401 int i;
402
403 for (i = 0; i < acm->rx_buflimit; ++i) {
404 res = acm_submit_read_urb(acm, i, mem_flags);
405 if (res)
406 return res;
407 }
408
409 return 0;
410 }
411
412 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
413 {
414 if (!urb->actual_length)
415 return;
416
417 tty_insert_flip_string(&acm->port, urb->transfer_buffer,
418 urb->actual_length);
419 tty_flip_buffer_push(&acm->port);
420 }
421
422 static void acm_read_bulk_callback(struct urb *urb)
423 {
424 struct acm_rb *rb = urb->context;
425 struct acm *acm = rb->instance;
426 unsigned long flags;
427
428 dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
429 rb->index, urb->actual_length);
430 set_bit(rb->index, &acm->read_urbs_free);
431
432 if (!acm->dev) {
433 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
434 return;
435 }
436 usb_mark_last_busy(acm->dev);
437
438 if (urb->status) {
439 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
440 __func__, urb->status);
441 return;
442 }
443 acm_process_read_urb(acm, urb);
444
445 /* throttle device if requested by tty */
446 spin_lock_irqsave(&acm->read_lock, flags);
447 acm->throttled = acm->throttle_req;
448 if (!acm->throttled && !acm->susp_count) {
449 spin_unlock_irqrestore(&acm->read_lock, flags);
450 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
451 } else {
452 spin_unlock_irqrestore(&acm->read_lock, flags);
453 }
454 }
455
456 /* data interface wrote those outgoing bytes */
457 static void acm_write_bulk(struct urb *urb)
458 {
459 struct acm_wb *wb = urb->context;
460 struct acm *acm = wb->instance;
461 unsigned long flags;
462
463 if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
464 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
465 __func__,
466 urb->actual_length,
467 urb->transfer_buffer_length,
468 urb->status);
469
470 spin_lock_irqsave(&acm->write_lock, flags);
471 acm_write_done(acm, wb);
472 spin_unlock_irqrestore(&acm->write_lock, flags);
473 schedule_work(&acm->work);
474 }
475
476 static void acm_softint(struct work_struct *work)
477 {
478 struct acm *acm = container_of(work, struct acm, work);
479
480 dev_vdbg(&acm->data->dev, "%s\n", __func__);
481
482 tty_port_tty_wakeup(&acm->port);
483 }
484
485 /*
486 * TTY handlers
487 */
488
489 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
490 {
491 struct acm *acm;
492 int retval;
493
494 dev_dbg(tty->dev, "%s\n", __func__);
495
496 acm = acm_get_by_index(tty->index);
497 if (!acm)
498 return -ENODEV;
499
500 retval = tty_standard_install(driver, tty);
501 if (retval)
502 goto error_init_termios;
503
504 tty->driver_data = acm;
505
506 return 0;
507
508 error_init_termios:
509 tty_port_put(&acm->port);
510 return retval;
511 }
512
513 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
514 {
515 struct acm *acm = tty->driver_data;
516
517 dev_dbg(tty->dev, "%s\n", __func__);
518
519 return tty_port_open(&acm->port, tty, filp);
520 }
521
522 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
523 {
524 struct acm *acm = container_of(port, struct acm, port);
525 int retval = -ENODEV;
526 int i;
527
528 dev_dbg(&acm->control->dev, "%s\n", __func__);
529
530 mutex_lock(&acm->mutex);
531 if (acm->disconnected)
532 goto disconnected;
533
534 retval = usb_autopm_get_interface(acm->control);
535 if (retval)
536 goto error_get_interface;
537
538 /*
539 * FIXME: Why do we need this? Allocating 64K of physically contiguous
540 * memory is really nasty...
541 */
542 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
543 acm->control->needs_remote_wakeup = 1;
544
545 acm->ctrlurb->dev = acm->dev;
546 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
547 if (retval) {
548 dev_err(&acm->control->dev,
549 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
550 goto error_submit_urb;
551 }
552
553 acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
554 retval = acm_set_control(acm, acm->ctrlout);
555 if (retval < 0 && (acm->ctrl_caps & USB_CDC_CAP_LINE))
556 goto error_set_control;
557
558 /*
559 * Unthrottle device in case the TTY was closed while throttled.
560 */
561 spin_lock_irq(&acm->read_lock);
562 acm->throttled = 0;
563 acm->throttle_req = 0;
564 spin_unlock_irq(&acm->read_lock);
565
566 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
567 if (retval)
568 goto error_submit_read_urbs;
569
570 usb_autopm_put_interface(acm->control);
571
572 mutex_unlock(&acm->mutex);
573
574 return 0;
575
576 error_submit_read_urbs:
577 for (i = 0; i < acm->rx_buflimit; i++)
578 usb_kill_urb(acm->read_urbs[i]);
579 acm->ctrlout = 0;
580 acm_set_control(acm, acm->ctrlout);
581 error_set_control:
582 usb_kill_urb(acm->ctrlurb);
583 error_submit_urb:
584 usb_autopm_put_interface(acm->control);
585 error_get_interface:
586 disconnected:
587 mutex_unlock(&acm->mutex);
588
589 return usb_translate_errors(retval);
590 }
591
592 static void acm_port_destruct(struct tty_port *port)
593 {
594 struct acm *acm = container_of(port, struct acm, port);
595
596 dev_dbg(&acm->control->dev, "%s\n", __func__);
597
598 acm_release_minor(acm);
599 usb_put_intf(acm->control);
600 kfree(acm->country_codes);
601 kfree(acm);
602 }
603
604 static void acm_port_shutdown(struct tty_port *port)
605 {
606 struct acm *acm = container_of(port, struct acm, port);
607 struct urb *urb;
608 struct acm_wb *wb;
609 int i;
610 int pm_err;
611
612 dev_dbg(&acm->control->dev, "%s\n", __func__);
613
614 mutex_lock(&acm->mutex);
615 if (!acm->disconnected) {
616 pm_err = usb_autopm_get_interface(acm->control);
617 acm_set_control(acm, acm->ctrlout = 0);
618
619 for (;;) {
620 urb = usb_get_from_anchor(&acm->delayed);
621 if (!urb)
622 break;
623 wb = urb->context;
624 wb->use = 0;
625 usb_autopm_put_interface_async(acm->control);
626 }
627
628 usb_kill_urb(acm->ctrlurb);
629 for (i = 0; i < ACM_NW; i++)
630 usb_kill_urb(acm->wb[i].urb);
631 for (i = 0; i < acm->rx_buflimit; i++)
632 usb_kill_urb(acm->read_urbs[i]);
633 acm->control->needs_remote_wakeup = 0;
634 if (!pm_err)
635 usb_autopm_put_interface(acm->control);
636 }
637 mutex_unlock(&acm->mutex);
638 }
639
640 static void acm_tty_cleanup(struct tty_struct *tty)
641 {
642 struct acm *acm = tty->driver_data;
643 dev_dbg(&acm->control->dev, "%s\n", __func__);
644 tty_port_put(&acm->port);
645 }
646
647 static void acm_tty_hangup(struct tty_struct *tty)
648 {
649 struct acm *acm = tty->driver_data;
650 dev_dbg(&acm->control->dev, "%s\n", __func__);
651 tty_port_hangup(&acm->port);
652 }
653
654 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
655 {
656 struct acm *acm = tty->driver_data;
657 dev_dbg(&acm->control->dev, "%s\n", __func__);
658 tty_port_close(&acm->port, tty, filp);
659 }
660
661 static int acm_tty_write(struct tty_struct *tty,
662 const unsigned char *buf, int count)
663 {
664 struct acm *acm = tty->driver_data;
665 int stat;
666 unsigned long flags;
667 int wbn;
668 struct acm_wb *wb;
669
670 if (!count)
671 return 0;
672
673 dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
674
675 spin_lock_irqsave(&acm->write_lock, flags);
676 wbn = acm_wb_alloc(acm);
677 if (wbn < 0) {
678 spin_unlock_irqrestore(&acm->write_lock, flags);
679 return 0;
680 }
681 wb = &acm->wb[wbn];
682
683 count = (count > acm->writesize) ? acm->writesize : count;
684 dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
685 memcpy(wb->buf, buf, count);
686 wb->len = count;
687 spin_unlock_irqrestore(&acm->write_lock, flags);
688
689 stat = acm_write_start(acm, wbn);
690 if (stat < 0)
691 return stat;
692 return count;
693 }
694
695 static int acm_tty_write_room(struct tty_struct *tty)
696 {
697 struct acm *acm = tty->driver_data;
698 /*
699 * Do not let the line discipline to know that we have a reserve,
700 * or it might get too enthusiastic.
701 */
702 return acm_wb_is_avail(acm) ? acm->writesize : 0;
703 }
704
705 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
706 {
707 struct acm *acm = tty->driver_data;
708 /*
709 * if the device was unplugged then any remaining characters fell out
710 * of the connector ;)
711 */
712 if (acm->disconnected)
713 return 0;
714 /*
715 * This is inaccurate (overcounts), but it works.
716 */
717 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
718 }
719
720 static void acm_tty_throttle(struct tty_struct *tty)
721 {
722 struct acm *acm = tty->driver_data;
723
724 spin_lock_irq(&acm->read_lock);
725 acm->throttle_req = 1;
726 spin_unlock_irq(&acm->read_lock);
727 }
728
729 static void acm_tty_unthrottle(struct tty_struct *tty)
730 {
731 struct acm *acm = tty->driver_data;
732 unsigned int was_throttled;
733
734 spin_lock_irq(&acm->read_lock);
735 was_throttled = acm->throttled;
736 acm->throttled = 0;
737 acm->throttle_req = 0;
738 spin_unlock_irq(&acm->read_lock);
739
740 if (was_throttled)
741 acm_submit_read_urbs(acm, GFP_KERNEL);
742 }
743
744 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
745 {
746 struct acm *acm = tty->driver_data;
747 int retval;
748
749 retval = acm_send_break(acm, state ? 0xffff : 0);
750 if (retval < 0)
751 dev_dbg(&acm->control->dev, "%s - send break failed\n",
752 __func__);
753 return retval;
754 }
755
756 static int acm_tty_tiocmget(struct tty_struct *tty)
757 {
758 struct acm *acm = tty->driver_data;
759
760 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
761 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
762 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
763 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
764 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
765 TIOCM_CTS;
766 }
767
768 static int acm_tty_tiocmset(struct tty_struct *tty,
769 unsigned int set, unsigned int clear)
770 {
771 struct acm *acm = tty->driver_data;
772 unsigned int newctrl;
773
774 newctrl = acm->ctrlout;
775 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
776 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
777 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
778 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
779
780 newctrl = (newctrl & ~clear) | set;
781
782 if (acm->ctrlout == newctrl)
783 return 0;
784 return acm_set_control(acm, acm->ctrlout = newctrl);
785 }
786
787 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
788 {
789 struct serial_struct tmp;
790
791 if (!info)
792 return -EINVAL;
793
794 memset(&tmp, 0, sizeof(tmp));
795 tmp.flags = ASYNC_LOW_LATENCY;
796 tmp.xmit_fifo_size = acm->writesize;
797 tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
798 tmp.close_delay = acm->port.close_delay / 10;
799 tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
800 ASYNC_CLOSING_WAIT_NONE :
801 acm->port.closing_wait / 10;
802
803 if (copy_to_user(info, &tmp, sizeof(tmp)))
804 return -EFAULT;
805 else
806 return 0;
807 }
808
809 static int set_serial_info(struct acm *acm,
810 struct serial_struct __user *newinfo)
811 {
812 struct serial_struct new_serial;
813 unsigned int closing_wait, close_delay;
814 int retval = 0;
815
816 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
817 return -EFAULT;
818
819 close_delay = new_serial.close_delay * 10;
820 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
821 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
822
823 mutex_lock(&acm->port.mutex);
824
825 if (!capable(CAP_SYS_ADMIN)) {
826 if ((close_delay != acm->port.close_delay) ||
827 (closing_wait != acm->port.closing_wait))
828 retval = -EPERM;
829 else
830 retval = -EOPNOTSUPP;
831 } else {
832 acm->port.close_delay = close_delay;
833 acm->port.closing_wait = closing_wait;
834 }
835
836 mutex_unlock(&acm->port.mutex);
837 return retval;
838 }
839
840 static int acm_tty_ioctl(struct tty_struct *tty,
841 unsigned int cmd, unsigned long arg)
842 {
843 struct acm *acm = tty->driver_data;
844 int rv = -ENOIOCTLCMD;
845
846 switch (cmd) {
847 case TIOCGSERIAL: /* gets serial port data */
848 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
849 break;
850 case TIOCSSERIAL:
851 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
852 break;
853 }
854
855 return rv;
856 }
857
858 static void acm_tty_set_termios(struct tty_struct *tty,
859 struct ktermios *termios_old)
860 {
861 struct acm *acm = tty->driver_data;
862 struct ktermios *termios = &tty->termios;
863 struct usb_cdc_line_coding newline;
864 int newctrl = acm->ctrlout;
865
866 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
867 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
868 newline.bParityType = termios->c_cflag & PARENB ?
869 (termios->c_cflag & PARODD ? 1 : 2) +
870 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
871 switch (termios->c_cflag & CSIZE) {
872 case CS5:
873 newline.bDataBits = 5;
874 break;
875 case CS6:
876 newline.bDataBits = 6;
877 break;
878 case CS7:
879 newline.bDataBits = 7;
880 break;
881 case CS8:
882 default:
883 newline.bDataBits = 8;
884 break;
885 }
886 /* FIXME: Needs to clear unsupported bits in the termios */
887 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
888
889 if (C_BAUD(tty) == B0) {
890 newline.dwDTERate = acm->line.dwDTERate;
891 newctrl &= ~ACM_CTRL_DTR;
892 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
893 newctrl |= ACM_CTRL_DTR;
894 }
895
896 if (newctrl != acm->ctrlout)
897 acm_set_control(acm, acm->ctrlout = newctrl);
898
899 if (memcmp(&acm->line, &newline, sizeof newline)) {
900 memcpy(&acm->line, &newline, sizeof newline);
901 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
902 __func__,
903 le32_to_cpu(newline.dwDTERate),
904 newline.bCharFormat, newline.bParityType,
905 newline.bDataBits);
906 acm_set_line(acm, &acm->line);
907 }
908 }
909
910 static const struct tty_port_operations acm_port_ops = {
911 .shutdown = acm_port_shutdown,
912 .activate = acm_port_activate,
913 .destruct = acm_port_destruct,
914 };
915
916 /*
917 * USB probe and disconnect routines.
918 */
919
920 /* Little helpers: write/read buffers free */
921 static void acm_write_buffers_free(struct acm *acm)
922 {
923 int i;
924 struct acm_wb *wb;
925 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
926
927 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
928 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
929 }
930
931 static void acm_read_buffers_free(struct acm *acm)
932 {
933 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
934 int i;
935
936 for (i = 0; i < acm->rx_buflimit; i++)
937 usb_free_coherent(usb_dev, acm->readsize,
938 acm->read_buffers[i].base, acm->read_buffers[i].dma);
939 }
940
941 /* Little helper: write buffers allocate */
942 static int acm_write_buffers_alloc(struct acm *acm)
943 {
944 int i;
945 struct acm_wb *wb;
946
947 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
948 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
949 &wb->dmah);
950 if (!wb->buf) {
951 while (i != 0) {
952 --i;
953 --wb;
954 usb_free_coherent(acm->dev, acm->writesize,
955 wb->buf, wb->dmah);
956 }
957 return -ENOMEM;
958 }
959 }
960 return 0;
961 }
962
963 static int acm_probe(struct usb_interface *intf,
964 const struct usb_device_id *id)
965 {
966 struct usb_cdc_union_desc *union_header = NULL;
967 struct usb_cdc_country_functional_desc *cfd = NULL;
968 unsigned char *buffer = intf->altsetting->extra;
969 int buflen = intf->altsetting->extralen;
970 struct usb_interface *control_interface;
971 struct usb_interface *data_interface;
972 struct usb_endpoint_descriptor *epctrl = NULL;
973 struct usb_endpoint_descriptor *epread = NULL;
974 struct usb_endpoint_descriptor *epwrite = NULL;
975 struct usb_device *usb_dev = interface_to_usbdev(intf);
976 struct acm *acm;
977 int minor;
978 int ctrlsize, readsize;
979 u8 *buf;
980 u8 ac_management_function = 0;
981 u8 call_management_function = 0;
982 int call_interface_num = -1;
983 int data_interface_num = -1;
984 unsigned long quirks;
985 int num_rx_buf;
986 int i;
987 int combined_interfaces = 0;
988 struct device *tty_dev;
989 int rv = -ENOMEM;
990
991 /* normal quirks */
992 quirks = (unsigned long)id->driver_info;
993
994 if (quirks == IGNORE_DEVICE)
995 return -ENODEV;
996
997 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
998
999 /* handle quirks deadly to normal probing*/
1000 if (quirks == NO_UNION_NORMAL) {
1001 data_interface = usb_ifnum_to_if(usb_dev, 1);
1002 control_interface = usb_ifnum_to_if(usb_dev, 0);
1003 /* we would crash */
1004 if (!data_interface || !control_interface)
1005 return -ENODEV;
1006 goto skip_normal_probe;
1007 }
1008
1009 /* normal probing*/
1010 if (!buffer) {
1011 dev_err(&intf->dev, "Weird descriptor references\n");
1012 return -EINVAL;
1013 }
1014
1015 if (!buflen) {
1016 if (intf->cur_altsetting->endpoint &&
1017 intf->cur_altsetting->endpoint->extralen &&
1018 intf->cur_altsetting->endpoint->extra) {
1019 dev_dbg(&intf->dev,
1020 "Seeking extra descriptors on endpoint\n");
1021 buflen = intf->cur_altsetting->endpoint->extralen;
1022 buffer = intf->cur_altsetting->endpoint->extra;
1023 } else {
1024 dev_err(&intf->dev,
1025 "Zero length descriptor references\n");
1026 return -EINVAL;
1027 }
1028 }
1029
1030 while (buflen > 0) {
1031 if (buffer[1] != USB_DT_CS_INTERFACE) {
1032 dev_err(&intf->dev, "skipping garbage\n");
1033 goto next_desc;
1034 }
1035
1036 switch (buffer[2]) {
1037 case USB_CDC_UNION_TYPE: /* we've found it */
1038 if (union_header) {
1039 dev_err(&intf->dev, "More than one "
1040 "union descriptor, skipping ...\n");
1041 goto next_desc;
1042 }
1043 union_header = (struct usb_cdc_union_desc *)buffer;
1044 break;
1045 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1046 cfd = (struct usb_cdc_country_functional_desc *)buffer;
1047 break;
1048 case USB_CDC_HEADER_TYPE: /* maybe check version */
1049 break; /* for now we ignore it */
1050 case USB_CDC_ACM_TYPE:
1051 ac_management_function = buffer[3];
1052 break;
1053 case USB_CDC_CALL_MANAGEMENT_TYPE:
1054 call_management_function = buffer[3];
1055 call_interface_num = buffer[4];
1056 if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1057 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1058 break;
1059 default:
1060 /* there are LOTS more CDC descriptors that
1061 * could legitimately be found here.
1062 */
1063 dev_dbg(&intf->dev, "Ignoring descriptor: "
1064 "type %02x, length %d\n",
1065 buffer[2], buffer[0]);
1066 break;
1067 }
1068 next_desc:
1069 buflen -= buffer[0];
1070 buffer += buffer[0];
1071 }
1072
1073 if (!union_header) {
1074 if (call_interface_num > 0) {
1075 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1076 /* quirks for Droids MuIn LCD */
1077 if (quirks & NO_DATA_INTERFACE)
1078 data_interface = usb_ifnum_to_if(usb_dev, 0);
1079 else
1080 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1081 control_interface = intf;
1082 } else {
1083 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1084 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1085 return -ENODEV;
1086 } else {
1087 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1088 combined_interfaces = 1;
1089 control_interface = data_interface = intf;
1090 goto look_for_collapsed_interface;
1091 }
1092 }
1093 } else {
1094 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1095 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1096 }
1097
1098 if (!control_interface || !data_interface) {
1099 dev_dbg(&intf->dev, "no interfaces\n");
1100 return -ENODEV;
1101 }
1102
1103 if (data_interface_num != call_interface_num)
1104 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1105
1106 if (control_interface == data_interface) {
1107 /* some broken devices designed for windows work this way */
1108 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1109 combined_interfaces = 1;
1110 /* a popular other OS doesn't use it */
1111 quirks |= NO_CAP_LINE;
1112 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1113 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1114 return -EINVAL;
1115 }
1116 look_for_collapsed_interface:
1117 for (i = 0; i < 3; i++) {
1118 struct usb_endpoint_descriptor *ep;
1119 ep = &data_interface->cur_altsetting->endpoint[i].desc;
1120
1121 if (usb_endpoint_is_int_in(ep))
1122 epctrl = ep;
1123 else if (usb_endpoint_is_bulk_out(ep))
1124 epwrite = ep;
1125 else if (usb_endpoint_is_bulk_in(ep))
1126 epread = ep;
1127 else
1128 return -EINVAL;
1129 }
1130 if (!epctrl || !epread || !epwrite)
1131 return -ENODEV;
1132 else
1133 goto made_compressed_probe;
1134 }
1135
1136 skip_normal_probe:
1137
1138 /*workaround for switched interfaces */
1139 if (data_interface->cur_altsetting->desc.bInterfaceClass
1140 != CDC_DATA_INTERFACE_TYPE) {
1141 if (control_interface->cur_altsetting->desc.bInterfaceClass
1142 == CDC_DATA_INTERFACE_TYPE) {
1143 struct usb_interface *t;
1144 dev_dbg(&intf->dev,
1145 "Your device has switched interfaces.\n");
1146 t = control_interface;
1147 control_interface = data_interface;
1148 data_interface = t;
1149 } else {
1150 return -EINVAL;
1151 }
1152 }
1153
1154 /* Accept probe requests only for the control interface */
1155 if (!combined_interfaces && intf != control_interface)
1156 return -ENODEV;
1157
1158 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1159 /* valid in this context */
1160 dev_dbg(&intf->dev, "The data interface isn't available\n");
1161 return -EBUSY;
1162 }
1163
1164
1165 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1166 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1167 return -EINVAL;
1168
1169 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1170 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1171 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1172
1173
1174 /* workaround for switched endpoints */
1175 if (!usb_endpoint_dir_in(epread)) {
1176 /* descriptors are swapped */
1177 struct usb_endpoint_descriptor *t;
1178 dev_dbg(&intf->dev,
1179 "The data interface has switched endpoints\n");
1180 t = epread;
1181 epread = epwrite;
1182 epwrite = t;
1183 }
1184 made_compressed_probe:
1185 dev_dbg(&intf->dev, "interfaces are valid\n");
1186
1187 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1188 if (acm == NULL) {
1189 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1190 goto alloc_fail;
1191 }
1192
1193 minor = acm_alloc_minor(acm);
1194 if (minor == ACM_TTY_MINORS) {
1195 dev_err(&intf->dev, "no more free acm devices\n");
1196 kfree(acm);
1197 return -ENODEV;
1198 }
1199
1200 ctrlsize = usb_endpoint_maxp(epctrl);
1201 readsize = usb_endpoint_maxp(epread) *
1202 (quirks == SINGLE_RX_URB ? 1 : 2);
1203 acm->combined_interfaces = combined_interfaces;
1204 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1205 acm->control = control_interface;
1206 acm->data = data_interface;
1207 acm->minor = minor;
1208 acm->dev = usb_dev;
1209 acm->ctrl_caps = ac_management_function;
1210 if (quirks & NO_CAP_LINE)
1211 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1212 acm->ctrlsize = ctrlsize;
1213 acm->readsize = readsize;
1214 acm->rx_buflimit = num_rx_buf;
1215 INIT_WORK(&acm->work, acm_softint);
1216 spin_lock_init(&acm->write_lock);
1217 spin_lock_init(&acm->read_lock);
1218 mutex_init(&acm->mutex);
1219 acm->is_int_ep = usb_endpoint_xfer_int(epread);
1220 if (acm->is_int_ep)
1221 acm->bInterval = epread->bInterval;
1222 tty_port_init(&acm->port);
1223 acm->port.ops = &acm_port_ops;
1224 init_usb_anchor(&acm->delayed);
1225
1226 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1227 if (!buf) {
1228 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1229 goto alloc_fail2;
1230 }
1231 acm->ctrl_buffer = buf;
1232
1233 if (acm_write_buffers_alloc(acm) < 0) {
1234 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1235 goto alloc_fail4;
1236 }
1237
1238 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1239 if (!acm->ctrlurb) {
1240 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1241 goto alloc_fail5;
1242 }
1243 for (i = 0; i < num_rx_buf; i++) {
1244 struct acm_rb *rb = &(acm->read_buffers[i]);
1245 struct urb *urb;
1246
1247 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1248 &rb->dma);
1249 if (!rb->base) {
1250 dev_err(&intf->dev, "out of memory "
1251 "(read bufs usb_alloc_coherent)\n");
1252 goto alloc_fail6;
1253 }
1254 rb->index = i;
1255 rb->instance = acm;
1256
1257 urb = usb_alloc_urb(0, GFP_KERNEL);
1258 if (!urb) {
1259 dev_err(&intf->dev,
1260 "out of memory (read urbs usb_alloc_urb)\n");
1261 goto alloc_fail6;
1262 }
1263 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1264 urb->transfer_dma = rb->dma;
1265 if (acm->is_int_ep) {
1266 usb_fill_int_urb(urb, acm->dev,
1267 usb_rcvintpipe(usb_dev, epread->bEndpointAddress),
1268 rb->base,
1269 acm->readsize,
1270 acm_read_bulk_callback, rb,
1271 acm->bInterval);
1272 } else {
1273 usb_fill_bulk_urb(urb, acm->dev,
1274 usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress),
1275 rb->base,
1276 acm->readsize,
1277 acm_read_bulk_callback, rb);
1278 }
1279
1280 acm->read_urbs[i] = urb;
1281 __set_bit(i, &acm->read_urbs_free);
1282 }
1283 for (i = 0; i < ACM_NW; i++) {
1284 struct acm_wb *snd = &(acm->wb[i]);
1285
1286 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1287 if (snd->urb == NULL) {
1288 dev_err(&intf->dev,
1289 "out of memory (write urbs usb_alloc_urb)\n");
1290 goto alloc_fail7;
1291 }
1292
1293 if (usb_endpoint_xfer_int(epwrite))
1294 usb_fill_int_urb(snd->urb, usb_dev,
1295 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1296 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1297 else
1298 usb_fill_bulk_urb(snd->urb, usb_dev,
1299 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1300 NULL, acm->writesize, acm_write_bulk, snd);
1301 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1302 snd->instance = acm;
1303 }
1304
1305 usb_set_intfdata(intf, acm);
1306
1307 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1308 if (i < 0)
1309 goto alloc_fail7;
1310
1311 if (cfd) { /* export the country data */
1312 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1313 if (!acm->country_codes)
1314 goto skip_countries;
1315 acm->country_code_size = cfd->bLength - 4;
1316 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1317 cfd->bLength - 4);
1318 acm->country_rel_date = cfd->iCountryCodeRelDate;
1319
1320 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1321 if (i < 0) {
1322 kfree(acm->country_codes);
1323 acm->country_codes = NULL;
1324 acm->country_code_size = 0;
1325 goto skip_countries;
1326 }
1327
1328 i = device_create_file(&intf->dev,
1329 &dev_attr_iCountryCodeRelDate);
1330 if (i < 0) {
1331 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1332 kfree(acm->country_codes);
1333 acm->country_codes = NULL;
1334 acm->country_code_size = 0;
1335 goto skip_countries;
1336 }
1337 }
1338
1339 skip_countries:
1340 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1341 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1342 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1343 /* works around buggy devices */
1344 epctrl->bInterval ? epctrl->bInterval : 0xff);
1345 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1346 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1347
1348 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1349
1350 acm_set_control(acm, acm->ctrlout);
1351
1352 acm->line.dwDTERate = cpu_to_le32(9600);
1353 acm->line.bDataBits = 8;
1354 acm_set_line(acm, &acm->line);
1355
1356 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1357 usb_set_intfdata(data_interface, acm);
1358
1359 usb_get_intf(control_interface);
1360 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1361 &control_interface->dev);
1362 if (IS_ERR(tty_dev)) {
1363 rv = PTR_ERR(tty_dev);
1364 goto alloc_fail8;
1365 }
1366
1367 return 0;
1368 alloc_fail8:
1369 if (acm->country_codes) {
1370 device_remove_file(&acm->control->dev,
1371 &dev_attr_wCountryCodes);
1372 device_remove_file(&acm->control->dev,
1373 &dev_attr_iCountryCodeRelDate);
1374 kfree(acm->country_codes);
1375 }
1376 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1377 alloc_fail7:
1378 usb_set_intfdata(intf, NULL);
1379 for (i = 0; i < ACM_NW; i++)
1380 usb_free_urb(acm->wb[i].urb);
1381 alloc_fail6:
1382 for (i = 0; i < num_rx_buf; i++)
1383 usb_free_urb(acm->read_urbs[i]);
1384 acm_read_buffers_free(acm);
1385 usb_free_urb(acm->ctrlurb);
1386 alloc_fail5:
1387 acm_write_buffers_free(acm);
1388 alloc_fail4:
1389 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1390 alloc_fail2:
1391 acm_release_minor(acm);
1392 kfree(acm);
1393 alloc_fail:
1394 return rv;
1395 }
1396
1397 static void stop_data_traffic(struct acm *acm)
1398 {
1399 int i;
1400
1401 dev_dbg(&acm->control->dev, "%s\n", __func__);
1402
1403 usb_kill_urb(acm->ctrlurb);
1404 for (i = 0; i < ACM_NW; i++)
1405 usb_kill_urb(acm->wb[i].urb);
1406 for (i = 0; i < acm->rx_buflimit; i++)
1407 usb_kill_urb(acm->read_urbs[i]);
1408
1409 cancel_work_sync(&acm->work);
1410 }
1411
1412 static void acm_disconnect(struct usb_interface *intf)
1413 {
1414 struct acm *acm = usb_get_intfdata(intf);
1415 struct usb_device *usb_dev = interface_to_usbdev(intf);
1416 struct tty_struct *tty;
1417 int i;
1418
1419 dev_dbg(&intf->dev, "%s\n", __func__);
1420
1421 /* sibling interface is already cleaning up */
1422 if (!acm)
1423 return;
1424
1425 mutex_lock(&acm->mutex);
1426 acm->disconnected = true;
1427 if (acm->country_codes) {
1428 device_remove_file(&acm->control->dev,
1429 &dev_attr_wCountryCodes);
1430 device_remove_file(&acm->control->dev,
1431 &dev_attr_iCountryCodeRelDate);
1432 }
1433 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1434 usb_set_intfdata(acm->control, NULL);
1435 usb_set_intfdata(acm->data, NULL);
1436 mutex_unlock(&acm->mutex);
1437
1438 tty = tty_port_tty_get(&acm->port);
1439 if (tty) {
1440 tty_vhangup(tty);
1441 tty_kref_put(tty);
1442 }
1443
1444 stop_data_traffic(acm);
1445
1446 tty_unregister_device(acm_tty_driver, acm->minor);
1447
1448 usb_free_urb(acm->ctrlurb);
1449 for (i = 0; i < ACM_NW; i++)
1450 usb_free_urb(acm->wb[i].urb);
1451 for (i = 0; i < acm->rx_buflimit; i++)
1452 usb_free_urb(acm->read_urbs[i]);
1453 acm_write_buffers_free(acm);
1454 usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1455 acm_read_buffers_free(acm);
1456
1457 if (!acm->combined_interfaces)
1458 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1459 acm->data : acm->control);
1460
1461 tty_port_put(&acm->port);
1462 }
1463
1464 #ifdef CONFIG_PM
1465 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1466 {
1467 struct acm *acm = usb_get_intfdata(intf);
1468 int cnt;
1469
1470 spin_lock_irq(&acm->read_lock);
1471 spin_lock(&acm->write_lock);
1472 if (PMSG_IS_AUTO(message)) {
1473 if (acm->transmitting) {
1474 spin_unlock(&acm->write_lock);
1475 spin_unlock_irq(&acm->read_lock);
1476 return -EBUSY;
1477 }
1478 }
1479 cnt = acm->susp_count++;
1480 spin_unlock(&acm->write_lock);
1481 spin_unlock_irq(&acm->read_lock);
1482
1483 if (cnt)
1484 return 0;
1485
1486 stop_data_traffic(acm);
1487
1488 return 0;
1489 }
1490
1491 static int acm_resume(struct usb_interface *intf)
1492 {
1493 struct acm *acm = usb_get_intfdata(intf);
1494 struct urb *urb;
1495 int rv = 0;
1496
1497 spin_lock_irq(&acm->read_lock);
1498 spin_lock(&acm->write_lock);
1499
1500 if (--acm->susp_count)
1501 goto out;
1502
1503 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1504 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1505
1506 for (;;) {
1507 urb = usb_get_from_anchor(&acm->delayed);
1508 if (!urb)
1509 break;
1510
1511 acm_start_wb(acm, urb->context);
1512 }
1513
1514 /*
1515 * delayed error checking because we must
1516 * do the write path at all cost
1517 */
1518 if (rv < 0)
1519 goto out;
1520
1521 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1522 }
1523 out:
1524 spin_unlock(&acm->write_lock);
1525 spin_unlock_irq(&acm->read_lock);
1526
1527 return rv;
1528 }
1529
1530 static int acm_reset_resume(struct usb_interface *intf)
1531 {
1532 struct acm *acm = usb_get_intfdata(intf);
1533
1534 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1535 tty_port_tty_hangup(&acm->port, false);
1536
1537 return acm_resume(intf);
1538 }
1539
1540 #endif /* CONFIG_PM */
1541
1542 #define NOKIA_PCSUITE_ACM_INFO(x) \
1543 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1544 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1545 USB_CDC_ACM_PROTO_VENDOR)
1546
1547 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1548 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1549 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1550 USB_CDC_ACM_PROTO_VENDOR)
1551
1552 /*
1553 * USB driver structure.
1554 */
1555
1556 static const struct usb_device_id acm_ids[] = {
1557 /* quirky and broken devices */
1558 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1559 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1560 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1561 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1562 },
1563 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1564 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1565 },
1566 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1567 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1568 },
1569 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1570 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1571 },
1572 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1573 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1574 },
1575 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1576 .driver_info = SINGLE_RX_URB,
1577 },
1578 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1579 .driver_info = SINGLE_RX_URB, /* firmware bug */
1580 },
1581 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1582 .driver_info = SINGLE_RX_URB, /* firmware bug */
1583 },
1584 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1585 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1586 },
1587 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1588 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1589 },
1590 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1591 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1592 },
1593 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1594 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1595 },
1596 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1597 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1598 },
1599 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1600 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1601 },
1602 /* Motorola H24 HSPA module: */
1603 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1604 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1605 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1606 },
1607 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1608 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1609 },
1610 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1611 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1612 },
1613 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1614 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1615 },
1616 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1617 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1618 },
1619 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1620 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1621 },
1622 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1623 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1624 },
1625
1626 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1627 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1628 data interface instead of
1629 communications interface.
1630 Maybe we should define a new
1631 quirk for this. */
1632 },
1633 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1634 .driver_info = NO_UNION_NORMAL,
1635 },
1636 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1637 .driver_info = NO_UNION_NORMAL,
1638 },
1639 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1640 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1641 },
1642 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1643 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1644 },
1645
1646 /* Nokia S60 phones expose two ACM channels. The first is
1647 * a modem and is picked up by the standard AT-command
1648 * information below. The second is 'vendor-specific' but
1649 * is treated as a serial device at the S60 end, so we want
1650 * to expose it on Linux too. */
1651 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1652 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1653 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1654 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1655 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1656 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1657 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1658 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1659 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1660 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1661 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1662 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1663 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1664 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1665 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1666 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1667 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1668 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1669 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1670 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1671 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1672 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1673 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1674 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1675 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1676 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1677 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1678 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1679 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1680 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1681 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1682 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1683 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1684 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1685 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1686 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1687 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1688 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1689 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1690 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1691 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1692 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1693 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1694 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1695 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1696 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1697 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1698 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1699 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1700 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1701 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1702 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1703 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1704 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1705 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1706 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1707 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1708 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1709
1710 /* Support for Owen devices */
1711 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1712
1713 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1714
1715 /* Support Lego NXT using pbLua firmware */
1716 { USB_DEVICE(0x0694, 0xff00),
1717 .driver_info = NOT_A_MODEM,
1718 },
1719
1720 /* Support for Droids MuIn LCD */
1721 { USB_DEVICE(0x04d8, 0x000b),
1722 .driver_info = NO_DATA_INTERFACE,
1723 },
1724
1725 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1726 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1727 .driver_info = IGNORE_DEVICE,
1728 },
1729 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1730 .driver_info = IGNORE_DEVICE,
1731 },
1732 #endif
1733
1734 /*Samsung phone in firmware update mode */
1735 { USB_DEVICE(0x04e8, 0x685d),
1736 .driver_info = IGNORE_DEVICE,
1737 },
1738
1739 /* Exclude Infineon Flash Loader utility */
1740 { USB_DEVICE(0x058b, 0x0041),
1741 .driver_info = IGNORE_DEVICE,
1742 },
1743
1744 /* control interfaces without any protocol set */
1745 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1746 USB_CDC_PROTO_NONE) },
1747
1748 /* control interfaces with various AT-command sets */
1749 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1750 USB_CDC_ACM_PROTO_AT_V25TER) },
1751 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1752 USB_CDC_ACM_PROTO_AT_PCCA101) },
1753 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1754 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1755 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1756 USB_CDC_ACM_PROTO_AT_GSM) },
1757 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1758 USB_CDC_ACM_PROTO_AT_3G) },
1759 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1760 USB_CDC_ACM_PROTO_AT_CDMA) },
1761
1762 { }
1763 };
1764
1765 MODULE_DEVICE_TABLE(usb, acm_ids);
1766
1767 static struct usb_driver acm_driver = {
1768 .name = "cdc_acm",
1769 .probe = acm_probe,
1770 .disconnect = acm_disconnect,
1771 #ifdef CONFIG_PM
1772 .suspend = acm_suspend,
1773 .resume = acm_resume,
1774 .reset_resume = acm_reset_resume,
1775 #endif
1776 .id_table = acm_ids,
1777 #ifdef CONFIG_PM
1778 .supports_autosuspend = 1,
1779 #endif
1780 .disable_hub_initiated_lpm = 1,
1781 };
1782
1783 /*
1784 * TTY driver structures.
1785 */
1786
1787 static const struct tty_operations acm_ops = {
1788 .install = acm_tty_install,
1789 .open = acm_tty_open,
1790 .close = acm_tty_close,
1791 .cleanup = acm_tty_cleanup,
1792 .hangup = acm_tty_hangup,
1793 .write = acm_tty_write,
1794 .write_room = acm_tty_write_room,
1795 .ioctl = acm_tty_ioctl,
1796 .throttle = acm_tty_throttle,
1797 .unthrottle = acm_tty_unthrottle,
1798 .chars_in_buffer = acm_tty_chars_in_buffer,
1799 .break_ctl = acm_tty_break_ctl,
1800 .set_termios = acm_tty_set_termios,
1801 .tiocmget = acm_tty_tiocmget,
1802 .tiocmset = acm_tty_tiocmset,
1803 };
1804
1805 /*
1806 * Init / exit.
1807 */
1808
1809 static int __init acm_init(void)
1810 {
1811 int retval;
1812 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1813 if (!acm_tty_driver)
1814 return -ENOMEM;
1815 acm_tty_driver->driver_name = "acm",
1816 acm_tty_driver->name = "ttyACM",
1817 acm_tty_driver->major = ACM_TTY_MAJOR,
1818 acm_tty_driver->minor_start = 0,
1819 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1820 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1821 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1822 acm_tty_driver->init_termios = tty_std_termios;
1823 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1824 HUPCL | CLOCAL;
1825 tty_set_operations(acm_tty_driver, &acm_ops);
1826
1827 retval = tty_register_driver(acm_tty_driver);
1828 if (retval) {
1829 put_tty_driver(acm_tty_driver);
1830 return retval;
1831 }
1832
1833 retval = usb_register(&acm_driver);
1834 if (retval) {
1835 tty_unregister_driver(acm_tty_driver);
1836 put_tty_driver(acm_tty_driver);
1837 return retval;
1838 }
1839
1840 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1841
1842 return 0;
1843 }
1844
1845 static void __exit acm_exit(void)
1846 {
1847 usb_deregister(&acm_driver);
1848 tty_unregister_driver(acm_tty_driver);
1849 put_tty_driver(acm_tty_driver);
1850 }
1851
1852 module_init(acm_init);
1853 module_exit(acm_exit);
1854
1855 MODULE_AUTHOR(DRIVER_AUTHOR);
1856 MODULE_DESCRIPTION(DRIVER_DESC);
1857 MODULE_LICENSE("GPL");
1858 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
kernel source for telekom puls (alcatel/mediatek)