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Merge tag 'davinci-fixes-for-v3.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.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 /*
220 * attributes exported through sysfs
221 */
222 static ssize_t show_caps
223 (struct device *dev, struct device_attribute *attr, char *buf)
224 {
225 struct usb_interface *intf = to_usb_interface(dev);
226 struct acm *acm = usb_get_intfdata(intf);
227
228 return sprintf(buf, "%d", acm->ctrl_caps);
229 }
230 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
231
232 static ssize_t show_country_codes
233 (struct device *dev, struct device_attribute *attr, char *buf)
234 {
235 struct usb_interface *intf = to_usb_interface(dev);
236 struct acm *acm = usb_get_intfdata(intf);
237
238 memcpy(buf, acm->country_codes, acm->country_code_size);
239 return acm->country_code_size;
240 }
241
242 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
243
244 static ssize_t show_country_rel_date
245 (struct device *dev, struct device_attribute *attr, char *buf)
246 {
247 struct usb_interface *intf = to_usb_interface(dev);
248 struct acm *acm = usb_get_intfdata(intf);
249
250 return sprintf(buf, "%d", acm->country_rel_date);
251 }
252
253 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
254 /*
255 * Interrupt handlers for various ACM device responses
256 */
257
258 /* control interface reports status changes with "interrupt" transfers */
259 static void acm_ctrl_irq(struct urb *urb)
260 {
261 struct acm *acm = urb->context;
262 struct usb_cdc_notification *dr = urb->transfer_buffer;
263 unsigned char *data;
264 int newctrl;
265 int difference;
266 int retval;
267 int status = urb->status;
268
269 switch (status) {
270 case 0:
271 /* success */
272 break;
273 case -ECONNRESET:
274 case -ENOENT:
275 case -ESHUTDOWN:
276 /* this urb is terminated, clean up */
277 dev_dbg(&acm->control->dev,
278 "%s - urb shutting down with status: %d\n",
279 __func__, status);
280 return;
281 default:
282 dev_dbg(&acm->control->dev,
283 "%s - nonzero urb status received: %d\n",
284 __func__, status);
285 goto exit;
286 }
287
288 usb_mark_last_busy(acm->dev);
289
290 data = (unsigned char *)(dr + 1);
291 switch (dr->bNotificationType) {
292 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
293 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
294 __func__, dr->wValue);
295 break;
296
297 case USB_CDC_NOTIFY_SERIAL_STATE:
298 newctrl = get_unaligned_le16(data);
299
300 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
301 dev_dbg(&acm->control->dev, "%s - calling hangup\n",
302 __func__);
303 tty_port_tty_hangup(&acm->port, false);
304 }
305
306 difference = acm->ctrlin ^ newctrl;
307 spin_lock(&acm->read_lock);
308 acm->ctrlin = newctrl;
309 acm->oldcount = acm->iocount;
310
311 if (difference & ACM_CTRL_DSR)
312 acm->iocount.dsr++;
313 if (difference & ACM_CTRL_BRK)
314 acm->iocount.brk++;
315 if (difference & ACM_CTRL_RI)
316 acm->iocount.rng++;
317 if (difference & ACM_CTRL_DCD)
318 acm->iocount.dcd++;
319 if (difference & ACM_CTRL_FRAMING)
320 acm->iocount.frame++;
321 if (difference & ACM_CTRL_PARITY)
322 acm->iocount.parity++;
323 if (difference & ACM_CTRL_OVERRUN)
324 acm->iocount.overrun++;
325 spin_unlock(&acm->read_lock);
326
327 if (difference)
328 wake_up_all(&acm->wioctl);
329
330 break;
331
332 default:
333 dev_dbg(&acm->control->dev,
334 "%s - unknown notification %d received: index %d "
335 "len %d data0 %d data1 %d\n",
336 __func__,
337 dr->bNotificationType, dr->wIndex,
338 dr->wLength, data[0], data[1]);
339 break;
340 }
341 exit:
342 retval = usb_submit_urb(urb, GFP_ATOMIC);
343 if (retval)
344 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
345 __func__, retval);
346 }
347
348 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
349 {
350 int res;
351
352 if (!test_and_clear_bit(index, &acm->read_urbs_free))
353 return 0;
354
355 dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
356
357 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
358 if (res) {
359 if (res != -EPERM) {
360 dev_err(&acm->data->dev,
361 "%s - usb_submit_urb failed: %d\n",
362 __func__, res);
363 }
364 set_bit(index, &acm->read_urbs_free);
365 return res;
366 }
367
368 return 0;
369 }
370
371 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
372 {
373 int res;
374 int i;
375
376 for (i = 0; i < acm->rx_buflimit; ++i) {
377 res = acm_submit_read_urb(acm, i, mem_flags);
378 if (res)
379 return res;
380 }
381
382 return 0;
383 }
384
385 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
386 {
387 if (!urb->actual_length)
388 return;
389
390 tty_insert_flip_string(&acm->port, urb->transfer_buffer,
391 urb->actual_length);
392 tty_flip_buffer_push(&acm->port);
393 }
394
395 static void acm_read_bulk_callback(struct urb *urb)
396 {
397 struct acm_rb *rb = urb->context;
398 struct acm *acm = rb->instance;
399 unsigned long flags;
400
401 dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
402 rb->index, urb->actual_length);
403 set_bit(rb->index, &acm->read_urbs_free);
404
405 if (!acm->dev) {
406 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
407 return;
408 }
409 usb_mark_last_busy(acm->dev);
410
411 if (urb->status) {
412 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
413 __func__, urb->status);
414 return;
415 }
416 acm_process_read_urb(acm, urb);
417
418 /* throttle device if requested by tty */
419 spin_lock_irqsave(&acm->read_lock, flags);
420 acm->throttled = acm->throttle_req;
421 if (!acm->throttled && !acm->susp_count) {
422 spin_unlock_irqrestore(&acm->read_lock, flags);
423 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
424 } else {
425 spin_unlock_irqrestore(&acm->read_lock, flags);
426 }
427 }
428
429 /* data interface wrote those outgoing bytes */
430 static void acm_write_bulk(struct urb *urb)
431 {
432 struct acm_wb *wb = urb->context;
433 struct acm *acm = wb->instance;
434 unsigned long flags;
435
436 if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
437 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
438 __func__,
439 urb->actual_length,
440 urb->transfer_buffer_length,
441 urb->status);
442
443 spin_lock_irqsave(&acm->write_lock, flags);
444 acm_write_done(acm, wb);
445 spin_unlock_irqrestore(&acm->write_lock, flags);
446 schedule_work(&acm->work);
447 }
448
449 static void acm_softint(struct work_struct *work)
450 {
451 struct acm *acm = container_of(work, struct acm, work);
452
453 dev_vdbg(&acm->data->dev, "%s\n", __func__);
454
455 tty_port_tty_wakeup(&acm->port);
456 }
457
458 /*
459 * TTY handlers
460 */
461
462 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
463 {
464 struct acm *acm;
465 int retval;
466
467 dev_dbg(tty->dev, "%s\n", __func__);
468
469 acm = acm_get_by_index(tty->index);
470 if (!acm)
471 return -ENODEV;
472
473 retval = tty_standard_install(driver, tty);
474 if (retval)
475 goto error_init_termios;
476
477 tty->driver_data = acm;
478
479 return 0;
480
481 error_init_termios:
482 tty_port_put(&acm->port);
483 return retval;
484 }
485
486 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
487 {
488 struct acm *acm = tty->driver_data;
489
490 dev_dbg(tty->dev, "%s\n", __func__);
491
492 return tty_port_open(&acm->port, tty, filp);
493 }
494
495 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
496 {
497 struct acm *acm = container_of(port, struct acm, port);
498 int retval = -ENODEV;
499
500 dev_dbg(&acm->control->dev, "%s\n", __func__);
501
502 mutex_lock(&acm->mutex);
503 if (acm->disconnected)
504 goto disconnected;
505
506 retval = usb_autopm_get_interface(acm->control);
507 if (retval)
508 goto error_get_interface;
509
510 /*
511 * FIXME: Why do we need this? Allocating 64K of physically contiguous
512 * memory is really nasty...
513 */
514 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
515 acm->control->needs_remote_wakeup = 1;
516
517 acm->ctrlurb->dev = acm->dev;
518 if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
519 dev_err(&acm->control->dev,
520 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
521 usb_autopm_put_interface(acm->control);
522 goto error_submit_urb;
523 }
524
525 acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
526 if (acm_set_control(acm, acm->ctrlout) < 0 &&
527 (acm->ctrl_caps & USB_CDC_CAP_LINE)) {
528 usb_autopm_put_interface(acm->control);
529 goto error_set_control;
530 }
531
532 usb_autopm_put_interface(acm->control);
533
534 /*
535 * Unthrottle device in case the TTY was closed while throttled.
536 */
537 spin_lock_irq(&acm->read_lock);
538 acm->throttled = 0;
539 acm->throttle_req = 0;
540 spin_unlock_irq(&acm->read_lock);
541
542 if (acm_submit_read_urbs(acm, GFP_KERNEL))
543 goto error_submit_read_urbs;
544
545 mutex_unlock(&acm->mutex);
546
547 return 0;
548
549 error_submit_read_urbs:
550 acm->ctrlout = 0;
551 acm_set_control(acm, acm->ctrlout);
552 error_set_control:
553 usb_kill_urb(acm->ctrlurb);
554 error_submit_urb:
555 error_get_interface:
556 disconnected:
557 mutex_unlock(&acm->mutex);
558 return retval;
559 }
560
561 static void acm_port_destruct(struct tty_port *port)
562 {
563 struct acm *acm = container_of(port, struct acm, port);
564
565 dev_dbg(&acm->control->dev, "%s\n", __func__);
566
567 acm_release_minor(acm);
568 usb_put_intf(acm->control);
569 kfree(acm->country_codes);
570 kfree(acm);
571 }
572
573 static void acm_port_shutdown(struct tty_port *port)
574 {
575 struct acm *acm = container_of(port, struct acm, port);
576 int i;
577
578 dev_dbg(&acm->control->dev, "%s\n", __func__);
579
580 mutex_lock(&acm->mutex);
581 if (!acm->disconnected) {
582 usb_autopm_get_interface(acm->control);
583 acm_set_control(acm, acm->ctrlout = 0);
584 usb_kill_urb(acm->ctrlurb);
585 for (i = 0; i < ACM_NW; i++)
586 usb_kill_urb(acm->wb[i].urb);
587 for (i = 0; i < acm->rx_buflimit; i++)
588 usb_kill_urb(acm->read_urbs[i]);
589 acm->control->needs_remote_wakeup = 0;
590 usb_autopm_put_interface(acm->control);
591 }
592 mutex_unlock(&acm->mutex);
593 }
594
595 static void acm_tty_cleanup(struct tty_struct *tty)
596 {
597 struct acm *acm = tty->driver_data;
598 dev_dbg(&acm->control->dev, "%s\n", __func__);
599 tty_port_put(&acm->port);
600 }
601
602 static void acm_tty_hangup(struct tty_struct *tty)
603 {
604 struct acm *acm = tty->driver_data;
605 dev_dbg(&acm->control->dev, "%s\n", __func__);
606 tty_port_hangup(&acm->port);
607 }
608
609 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
610 {
611 struct acm *acm = tty->driver_data;
612 dev_dbg(&acm->control->dev, "%s\n", __func__);
613 tty_port_close(&acm->port, tty, filp);
614 }
615
616 static int acm_tty_write(struct tty_struct *tty,
617 const unsigned char *buf, int count)
618 {
619 struct acm *acm = tty->driver_data;
620 int stat;
621 unsigned long flags;
622 int wbn;
623 struct acm_wb *wb;
624
625 if (!count)
626 return 0;
627
628 dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
629
630 spin_lock_irqsave(&acm->write_lock, flags);
631 wbn = acm_wb_alloc(acm);
632 if (wbn < 0) {
633 spin_unlock_irqrestore(&acm->write_lock, flags);
634 return 0;
635 }
636 wb = &acm->wb[wbn];
637
638 if (!acm->dev) {
639 wb->use = 0;
640 spin_unlock_irqrestore(&acm->write_lock, flags);
641 return -ENODEV;
642 }
643
644 count = (count > acm->writesize) ? acm->writesize : count;
645 dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
646 memcpy(wb->buf, buf, count);
647 wb->len = count;
648
649 usb_autopm_get_interface_async(acm->control);
650 if (acm->susp_count) {
651 if (!acm->delayed_wb)
652 acm->delayed_wb = wb;
653 else
654 usb_autopm_put_interface_async(acm->control);
655 spin_unlock_irqrestore(&acm->write_lock, flags);
656 return count; /* A white lie */
657 }
658 usb_mark_last_busy(acm->dev);
659
660 stat = acm_start_wb(acm, wb);
661 spin_unlock_irqrestore(&acm->write_lock, flags);
662
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 wait_serial_change(struct acm *acm, unsigned long arg)
814 {
815 int rv = 0;
816 DECLARE_WAITQUEUE(wait, current);
817 struct async_icount old, new;
818
819 if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
820 return -EINVAL;
821 do {
822 spin_lock_irq(&acm->read_lock);
823 old = acm->oldcount;
824 new = acm->iocount;
825 acm->oldcount = new;
826 spin_unlock_irq(&acm->read_lock);
827
828 if ((arg & TIOCM_DSR) &&
829 old.dsr != new.dsr)
830 break;
831 if ((arg & TIOCM_CD) &&
832 old.dcd != new.dcd)
833 break;
834 if ((arg & TIOCM_RI) &&
835 old.rng != new.rng)
836 break;
837
838 add_wait_queue(&acm->wioctl, &wait);
839 set_current_state(TASK_INTERRUPTIBLE);
840 schedule();
841 remove_wait_queue(&acm->wioctl, &wait);
842 if (acm->disconnected) {
843 if (arg & TIOCM_CD)
844 break;
845 else
846 rv = -ENODEV;
847 } else {
848 if (signal_pending(current))
849 rv = -ERESTARTSYS;
850 }
851 } while (!rv);
852
853
854
855 return rv;
856 }
857
858 static int get_serial_usage(struct acm *acm,
859 struct serial_icounter_struct __user *count)
860 {
861 struct serial_icounter_struct icount;
862 int rv = 0;
863
864 memset(&icount, 0, sizeof(icount));
865 icount.dsr = acm->iocount.dsr;
866 icount.rng = acm->iocount.rng;
867 icount.dcd = acm->iocount.dcd;
868 icount.frame = acm->iocount.frame;
869 icount.overrun = acm->iocount.overrun;
870 icount.parity = acm->iocount.parity;
871 icount.brk = acm->iocount.brk;
872
873 if (copy_to_user(count, &icount, sizeof(icount)) > 0)
874 rv = -EFAULT;
875
876 return rv;
877 }
878
879 static int acm_tty_ioctl(struct tty_struct *tty,
880 unsigned int cmd, unsigned long arg)
881 {
882 struct acm *acm = tty->driver_data;
883 int rv = -ENOIOCTLCMD;
884
885 switch (cmd) {
886 case TIOCGSERIAL: /* gets serial port data */
887 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
888 break;
889 case TIOCSSERIAL:
890 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
891 break;
892 case TIOCMIWAIT:
893 rv = usb_autopm_get_interface(acm->control);
894 if (rv < 0) {
895 rv = -EIO;
896 break;
897 }
898 rv = wait_serial_change(acm, arg);
899 usb_autopm_put_interface(acm->control);
900 break;
901 case TIOCGICOUNT:
902 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
903 break;
904 }
905
906 return rv;
907 }
908
909 static void acm_tty_set_termios(struct tty_struct *tty,
910 struct ktermios *termios_old)
911 {
912 struct acm *acm = tty->driver_data;
913 struct ktermios *termios = &tty->termios;
914 struct usb_cdc_line_coding newline;
915 int newctrl = acm->ctrlout;
916
917 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
918 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
919 newline.bParityType = termios->c_cflag & PARENB ?
920 (termios->c_cflag & PARODD ? 1 : 2) +
921 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
922 switch (termios->c_cflag & CSIZE) {
923 case CS5:
924 newline.bDataBits = 5;
925 break;
926 case CS6:
927 newline.bDataBits = 6;
928 break;
929 case CS7:
930 newline.bDataBits = 7;
931 break;
932 case CS8:
933 default:
934 newline.bDataBits = 8;
935 break;
936 }
937 /* FIXME: Needs to clear unsupported bits in the termios */
938 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
939
940 if (!newline.dwDTERate) {
941 newline.dwDTERate = acm->line.dwDTERate;
942 newctrl &= ~ACM_CTRL_DTR;
943 } else
944 newctrl |= ACM_CTRL_DTR;
945
946 if (newctrl != acm->ctrlout)
947 acm_set_control(acm, acm->ctrlout = newctrl);
948
949 if (memcmp(&acm->line, &newline, sizeof newline)) {
950 memcpy(&acm->line, &newline, sizeof newline);
951 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
952 __func__,
953 le32_to_cpu(newline.dwDTERate),
954 newline.bCharFormat, newline.bParityType,
955 newline.bDataBits);
956 acm_set_line(acm, &acm->line);
957 }
958 }
959
960 static const struct tty_port_operations acm_port_ops = {
961 .shutdown = acm_port_shutdown,
962 .activate = acm_port_activate,
963 .destruct = acm_port_destruct,
964 };
965
966 /*
967 * USB probe and disconnect routines.
968 */
969
970 /* Little helpers: write/read buffers free */
971 static void acm_write_buffers_free(struct acm *acm)
972 {
973 int i;
974 struct acm_wb *wb;
975 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
976
977 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
978 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
979 }
980
981 static void acm_read_buffers_free(struct acm *acm)
982 {
983 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
984 int i;
985
986 for (i = 0; i < acm->rx_buflimit; i++)
987 usb_free_coherent(usb_dev, acm->readsize,
988 acm->read_buffers[i].base, acm->read_buffers[i].dma);
989 }
990
991 /* Little helper: write buffers allocate */
992 static int acm_write_buffers_alloc(struct acm *acm)
993 {
994 int i;
995 struct acm_wb *wb;
996
997 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
998 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
999 &wb->dmah);
1000 if (!wb->buf) {
1001 while (i != 0) {
1002 --i;
1003 --wb;
1004 usb_free_coherent(acm->dev, acm->writesize,
1005 wb->buf, wb->dmah);
1006 }
1007 return -ENOMEM;
1008 }
1009 }
1010 return 0;
1011 }
1012
1013 static int acm_probe(struct usb_interface *intf,
1014 const struct usb_device_id *id)
1015 {
1016 struct usb_cdc_union_desc *union_header = NULL;
1017 struct usb_cdc_country_functional_desc *cfd = NULL;
1018 unsigned char *buffer = intf->altsetting->extra;
1019 int buflen = intf->altsetting->extralen;
1020 struct usb_interface *control_interface;
1021 struct usb_interface *data_interface;
1022 struct usb_endpoint_descriptor *epctrl = NULL;
1023 struct usb_endpoint_descriptor *epread = NULL;
1024 struct usb_endpoint_descriptor *epwrite = NULL;
1025 struct usb_device *usb_dev = interface_to_usbdev(intf);
1026 struct acm *acm;
1027 int minor;
1028 int ctrlsize, readsize;
1029 u8 *buf;
1030 u8 ac_management_function = 0;
1031 u8 call_management_function = 0;
1032 int call_interface_num = -1;
1033 int data_interface_num = -1;
1034 unsigned long quirks;
1035 int num_rx_buf;
1036 int i;
1037 int combined_interfaces = 0;
1038 struct device *tty_dev;
1039 int rv = -ENOMEM;
1040
1041 /* normal quirks */
1042 quirks = (unsigned long)id->driver_info;
1043
1044 if (quirks == IGNORE_DEVICE)
1045 return -ENODEV;
1046
1047 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1048
1049 /* handle quirks deadly to normal probing*/
1050 if (quirks == NO_UNION_NORMAL) {
1051 data_interface = usb_ifnum_to_if(usb_dev, 1);
1052 control_interface = usb_ifnum_to_if(usb_dev, 0);
1053 goto skip_normal_probe;
1054 }
1055
1056 /* normal probing*/
1057 if (!buffer) {
1058 dev_err(&intf->dev, "Weird descriptor references\n");
1059 return -EINVAL;
1060 }
1061
1062 if (!buflen) {
1063 if (intf->cur_altsetting->endpoint &&
1064 intf->cur_altsetting->endpoint->extralen &&
1065 intf->cur_altsetting->endpoint->extra) {
1066 dev_dbg(&intf->dev,
1067 "Seeking extra descriptors on endpoint\n");
1068 buflen = intf->cur_altsetting->endpoint->extralen;
1069 buffer = intf->cur_altsetting->endpoint->extra;
1070 } else {
1071 dev_err(&intf->dev,
1072 "Zero length descriptor references\n");
1073 return -EINVAL;
1074 }
1075 }
1076
1077 while (buflen > 0) {
1078 if (buffer[1] != USB_DT_CS_INTERFACE) {
1079 dev_err(&intf->dev, "skipping garbage\n");
1080 goto next_desc;
1081 }
1082
1083 switch (buffer[2]) {
1084 case USB_CDC_UNION_TYPE: /* we've found it */
1085 if (union_header) {
1086 dev_err(&intf->dev, "More than one "
1087 "union descriptor, skipping ...\n");
1088 goto next_desc;
1089 }
1090 union_header = (struct usb_cdc_union_desc *)buffer;
1091 break;
1092 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1093 cfd = (struct usb_cdc_country_functional_desc *)buffer;
1094 break;
1095 case USB_CDC_HEADER_TYPE: /* maybe check version */
1096 break; /* for now we ignore it */
1097 case USB_CDC_ACM_TYPE:
1098 ac_management_function = buffer[3];
1099 break;
1100 case USB_CDC_CALL_MANAGEMENT_TYPE:
1101 call_management_function = buffer[3];
1102 call_interface_num = buffer[4];
1103 if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1104 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1105 break;
1106 default:
1107 /* there are LOTS more CDC descriptors that
1108 * could legitimately be found here.
1109 */
1110 dev_dbg(&intf->dev, "Ignoring descriptor: "
1111 "type %02x, length %d\n",
1112 buffer[2], buffer[0]);
1113 break;
1114 }
1115 next_desc:
1116 buflen -= buffer[0];
1117 buffer += buffer[0];
1118 }
1119
1120 if (!union_header) {
1121 if (call_interface_num > 0) {
1122 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1123 /* quirks for Droids MuIn LCD */
1124 if (quirks & NO_DATA_INTERFACE)
1125 data_interface = usb_ifnum_to_if(usb_dev, 0);
1126 else
1127 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1128 control_interface = intf;
1129 } else {
1130 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1131 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1132 return -ENODEV;
1133 } else {
1134 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1135 combined_interfaces = 1;
1136 control_interface = data_interface = intf;
1137 goto look_for_collapsed_interface;
1138 }
1139 }
1140 } else {
1141 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1142 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1143 if (!control_interface || !data_interface) {
1144 dev_dbg(&intf->dev, "no interfaces\n");
1145 return -ENODEV;
1146 }
1147 }
1148
1149 if (data_interface_num != call_interface_num)
1150 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1151
1152 if (control_interface == data_interface) {
1153 /* some broken devices designed for windows work this way */
1154 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1155 combined_interfaces = 1;
1156 /* a popular other OS doesn't use it */
1157 quirks |= NO_CAP_LINE;
1158 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1159 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1160 return -EINVAL;
1161 }
1162 look_for_collapsed_interface:
1163 for (i = 0; i < 3; i++) {
1164 struct usb_endpoint_descriptor *ep;
1165 ep = &data_interface->cur_altsetting->endpoint[i].desc;
1166
1167 if (usb_endpoint_is_int_in(ep))
1168 epctrl = ep;
1169 else if (usb_endpoint_is_bulk_out(ep))
1170 epwrite = ep;
1171 else if (usb_endpoint_is_bulk_in(ep))
1172 epread = ep;
1173 else
1174 return -EINVAL;
1175 }
1176 if (!epctrl || !epread || !epwrite)
1177 return -ENODEV;
1178 else
1179 goto made_compressed_probe;
1180 }
1181
1182 skip_normal_probe:
1183
1184 /*workaround for switched interfaces */
1185 if (data_interface->cur_altsetting->desc.bInterfaceClass
1186 != CDC_DATA_INTERFACE_TYPE) {
1187 if (control_interface->cur_altsetting->desc.bInterfaceClass
1188 == CDC_DATA_INTERFACE_TYPE) {
1189 struct usb_interface *t;
1190 dev_dbg(&intf->dev,
1191 "Your device has switched interfaces.\n");
1192 t = control_interface;
1193 control_interface = data_interface;
1194 data_interface = t;
1195 } else {
1196 return -EINVAL;
1197 }
1198 }
1199
1200 /* Accept probe requests only for the control interface */
1201 if (!combined_interfaces && intf != control_interface)
1202 return -ENODEV;
1203
1204 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1205 /* valid in this context */
1206 dev_dbg(&intf->dev, "The data interface isn't available\n");
1207 return -EBUSY;
1208 }
1209
1210
1211 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1212 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1213 return -EINVAL;
1214
1215 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1216 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1217 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1218
1219
1220 /* workaround for switched endpoints */
1221 if (!usb_endpoint_dir_in(epread)) {
1222 /* descriptors are swapped */
1223 struct usb_endpoint_descriptor *t;
1224 dev_dbg(&intf->dev,
1225 "The data interface has switched endpoints\n");
1226 t = epread;
1227 epread = epwrite;
1228 epwrite = t;
1229 }
1230 made_compressed_probe:
1231 dev_dbg(&intf->dev, "interfaces are valid\n");
1232
1233 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1234 if (acm == NULL) {
1235 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1236 goto alloc_fail;
1237 }
1238
1239 minor = acm_alloc_minor(acm);
1240 if (minor == ACM_TTY_MINORS) {
1241 dev_err(&intf->dev, "no more free acm devices\n");
1242 kfree(acm);
1243 return -ENODEV;
1244 }
1245
1246 ctrlsize = usb_endpoint_maxp(epctrl);
1247 readsize = usb_endpoint_maxp(epread) *
1248 (quirks == SINGLE_RX_URB ? 1 : 2);
1249 acm->combined_interfaces = combined_interfaces;
1250 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1251 acm->control = control_interface;
1252 acm->data = data_interface;
1253 acm->minor = minor;
1254 acm->dev = usb_dev;
1255 acm->ctrl_caps = ac_management_function;
1256 if (quirks & NO_CAP_LINE)
1257 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1258 acm->ctrlsize = ctrlsize;
1259 acm->readsize = readsize;
1260 acm->rx_buflimit = num_rx_buf;
1261 INIT_WORK(&acm->work, acm_softint);
1262 init_waitqueue_head(&acm->wioctl);
1263 spin_lock_init(&acm->write_lock);
1264 spin_lock_init(&acm->read_lock);
1265 mutex_init(&acm->mutex);
1266 acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1267 acm->is_int_ep = usb_endpoint_xfer_int(epread);
1268 if (acm->is_int_ep)
1269 acm->bInterval = epread->bInterval;
1270 tty_port_init(&acm->port);
1271 acm->port.ops = &acm_port_ops;
1272
1273 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1274 if (!buf) {
1275 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1276 goto alloc_fail2;
1277 }
1278 acm->ctrl_buffer = buf;
1279
1280 if (acm_write_buffers_alloc(acm) < 0) {
1281 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1282 goto alloc_fail4;
1283 }
1284
1285 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1286 if (!acm->ctrlurb) {
1287 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1288 goto alloc_fail5;
1289 }
1290 for (i = 0; i < num_rx_buf; i++) {
1291 struct acm_rb *rb = &(acm->read_buffers[i]);
1292 struct urb *urb;
1293
1294 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1295 &rb->dma);
1296 if (!rb->base) {
1297 dev_err(&intf->dev, "out of memory "
1298 "(read bufs usb_alloc_coherent)\n");
1299 goto alloc_fail6;
1300 }
1301 rb->index = i;
1302 rb->instance = acm;
1303
1304 urb = usb_alloc_urb(0, GFP_KERNEL);
1305 if (!urb) {
1306 dev_err(&intf->dev,
1307 "out of memory (read urbs usb_alloc_urb)\n");
1308 goto alloc_fail6;
1309 }
1310 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1311 urb->transfer_dma = rb->dma;
1312 if (acm->is_int_ep) {
1313 usb_fill_int_urb(urb, acm->dev,
1314 acm->rx_endpoint,
1315 rb->base,
1316 acm->readsize,
1317 acm_read_bulk_callback, rb,
1318 acm->bInterval);
1319 } else {
1320 usb_fill_bulk_urb(urb, acm->dev,
1321 acm->rx_endpoint,
1322 rb->base,
1323 acm->readsize,
1324 acm_read_bulk_callback, rb);
1325 }
1326
1327 acm->read_urbs[i] = urb;
1328 __set_bit(i, &acm->read_urbs_free);
1329 }
1330 for (i = 0; i < ACM_NW; i++) {
1331 struct acm_wb *snd = &(acm->wb[i]);
1332
1333 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1334 if (snd->urb == NULL) {
1335 dev_err(&intf->dev,
1336 "out of memory (write urbs usb_alloc_urb)\n");
1337 goto alloc_fail7;
1338 }
1339
1340 if (usb_endpoint_xfer_int(epwrite))
1341 usb_fill_int_urb(snd->urb, usb_dev,
1342 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1343 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1344 else
1345 usb_fill_bulk_urb(snd->urb, usb_dev,
1346 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1347 NULL, acm->writesize, acm_write_bulk, snd);
1348 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1349 snd->instance = acm;
1350 }
1351
1352 usb_set_intfdata(intf, acm);
1353
1354 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1355 if (i < 0)
1356 goto alloc_fail7;
1357
1358 if (cfd) { /* export the country data */
1359 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1360 if (!acm->country_codes)
1361 goto skip_countries;
1362 acm->country_code_size = cfd->bLength - 4;
1363 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1364 cfd->bLength - 4);
1365 acm->country_rel_date = cfd->iCountryCodeRelDate;
1366
1367 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1368 if (i < 0) {
1369 kfree(acm->country_codes);
1370 acm->country_codes = NULL;
1371 acm->country_code_size = 0;
1372 goto skip_countries;
1373 }
1374
1375 i = device_create_file(&intf->dev,
1376 &dev_attr_iCountryCodeRelDate);
1377 if (i < 0) {
1378 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1379 kfree(acm->country_codes);
1380 acm->country_codes = NULL;
1381 acm->country_code_size = 0;
1382 goto skip_countries;
1383 }
1384 }
1385
1386 skip_countries:
1387 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1388 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1389 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1390 /* works around buggy devices */
1391 epctrl->bInterval ? epctrl->bInterval : 16);
1392 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1393 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1394
1395 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1396
1397 acm_set_control(acm, acm->ctrlout);
1398
1399 acm->line.dwDTERate = cpu_to_le32(9600);
1400 acm->line.bDataBits = 8;
1401 acm_set_line(acm, &acm->line);
1402
1403 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1404 usb_set_intfdata(data_interface, acm);
1405
1406 usb_get_intf(control_interface);
1407 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1408 &control_interface->dev);
1409 if (IS_ERR(tty_dev)) {
1410 rv = PTR_ERR(tty_dev);
1411 goto alloc_fail8;
1412 }
1413
1414 return 0;
1415 alloc_fail8:
1416 if (acm->country_codes) {
1417 device_remove_file(&acm->control->dev,
1418 &dev_attr_wCountryCodes);
1419 device_remove_file(&acm->control->dev,
1420 &dev_attr_iCountryCodeRelDate);
1421 }
1422 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1423 alloc_fail7:
1424 usb_set_intfdata(intf, NULL);
1425 for (i = 0; i < ACM_NW; i++)
1426 usb_free_urb(acm->wb[i].urb);
1427 alloc_fail6:
1428 for (i = 0; i < num_rx_buf; i++)
1429 usb_free_urb(acm->read_urbs[i]);
1430 acm_read_buffers_free(acm);
1431 usb_free_urb(acm->ctrlurb);
1432 alloc_fail5:
1433 acm_write_buffers_free(acm);
1434 alloc_fail4:
1435 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1436 alloc_fail2:
1437 acm_release_minor(acm);
1438 kfree(acm);
1439 alloc_fail:
1440 return rv;
1441 }
1442
1443 static void stop_data_traffic(struct acm *acm)
1444 {
1445 int i;
1446
1447 dev_dbg(&acm->control->dev, "%s\n", __func__);
1448
1449 usb_kill_urb(acm->ctrlurb);
1450 for (i = 0; i < ACM_NW; i++)
1451 usb_kill_urb(acm->wb[i].urb);
1452 for (i = 0; i < acm->rx_buflimit; i++)
1453 usb_kill_urb(acm->read_urbs[i]);
1454
1455 cancel_work_sync(&acm->work);
1456 }
1457
1458 static void acm_disconnect(struct usb_interface *intf)
1459 {
1460 struct acm *acm = usb_get_intfdata(intf);
1461 struct usb_device *usb_dev = interface_to_usbdev(intf);
1462 struct tty_struct *tty;
1463 int i;
1464
1465 dev_dbg(&intf->dev, "%s\n", __func__);
1466
1467 /* sibling interface is already cleaning up */
1468 if (!acm)
1469 return;
1470
1471 mutex_lock(&acm->mutex);
1472 acm->disconnected = true;
1473 if (acm->country_codes) {
1474 device_remove_file(&acm->control->dev,
1475 &dev_attr_wCountryCodes);
1476 device_remove_file(&acm->control->dev,
1477 &dev_attr_iCountryCodeRelDate);
1478 }
1479 wake_up_all(&acm->wioctl);
1480 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1481 usb_set_intfdata(acm->control, NULL);
1482 usb_set_intfdata(acm->data, NULL);
1483 mutex_unlock(&acm->mutex);
1484
1485 tty = tty_port_tty_get(&acm->port);
1486 if (tty) {
1487 tty_vhangup(tty);
1488 tty_kref_put(tty);
1489 }
1490
1491 stop_data_traffic(acm);
1492
1493 tty_unregister_device(acm_tty_driver, acm->minor);
1494
1495 usb_free_urb(acm->ctrlurb);
1496 for (i = 0; i < ACM_NW; i++)
1497 usb_free_urb(acm->wb[i].urb);
1498 for (i = 0; i < acm->rx_buflimit; i++)
1499 usb_free_urb(acm->read_urbs[i]);
1500 acm_write_buffers_free(acm);
1501 usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1502 acm_read_buffers_free(acm);
1503
1504 if (!acm->combined_interfaces)
1505 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1506 acm->data : acm->control);
1507
1508 tty_port_put(&acm->port);
1509 }
1510
1511 #ifdef CONFIG_PM
1512 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1513 {
1514 struct acm *acm = usb_get_intfdata(intf);
1515 int cnt;
1516
1517 if (PMSG_IS_AUTO(message)) {
1518 int b;
1519
1520 spin_lock_irq(&acm->write_lock);
1521 b = acm->transmitting;
1522 spin_unlock_irq(&acm->write_lock);
1523 if (b)
1524 return -EBUSY;
1525 }
1526
1527 spin_lock_irq(&acm->read_lock);
1528 spin_lock(&acm->write_lock);
1529 cnt = acm->susp_count++;
1530 spin_unlock(&acm->write_lock);
1531 spin_unlock_irq(&acm->read_lock);
1532
1533 if (cnt)
1534 return 0;
1535
1536 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1537 stop_data_traffic(acm);
1538
1539 return 0;
1540 }
1541
1542 static int acm_resume(struct usb_interface *intf)
1543 {
1544 struct acm *acm = usb_get_intfdata(intf);
1545 struct acm_wb *wb;
1546 int rv = 0;
1547 int cnt;
1548
1549 spin_lock_irq(&acm->read_lock);
1550 acm->susp_count -= 1;
1551 cnt = acm->susp_count;
1552 spin_unlock_irq(&acm->read_lock);
1553
1554 if (cnt)
1555 return 0;
1556
1557 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1558 rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1559
1560 spin_lock_irq(&acm->write_lock);
1561 if (acm->delayed_wb) {
1562 wb = acm->delayed_wb;
1563 acm->delayed_wb = NULL;
1564 spin_unlock_irq(&acm->write_lock);
1565 acm_start_wb(acm, wb);
1566 } else {
1567 spin_unlock_irq(&acm->write_lock);
1568 }
1569
1570 /*
1571 * delayed error checking because we must
1572 * do the write path at all cost
1573 */
1574 if (rv < 0)
1575 goto err_out;
1576
1577 rv = acm_submit_read_urbs(acm, GFP_NOIO);
1578 }
1579
1580 err_out:
1581 return rv;
1582 }
1583
1584 static int acm_reset_resume(struct usb_interface *intf)
1585 {
1586 struct acm *acm = usb_get_intfdata(intf);
1587
1588 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1589 tty_port_tty_hangup(&acm->port, false);
1590
1591 return acm_resume(intf);
1592 }
1593
1594 #endif /* CONFIG_PM */
1595
1596 #define NOKIA_PCSUITE_ACM_INFO(x) \
1597 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1598 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1599 USB_CDC_ACM_PROTO_VENDOR)
1600
1601 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1602 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1603 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1604 USB_CDC_ACM_PROTO_VENDOR)
1605
1606 /*
1607 * USB driver structure.
1608 */
1609
1610 static const struct usb_device_id acm_ids[] = {
1611 /* quirky and broken devices */
1612 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1613 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1614 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1615 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1616 },
1617 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1618 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1619 },
1620 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1621 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1622 },
1623 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1624 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1625 },
1626 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1627 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1628 },
1629 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1630 .driver_info = SINGLE_RX_URB,
1631 },
1632 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1633 .driver_info = SINGLE_RX_URB, /* firmware bug */
1634 },
1635 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1636 .driver_info = SINGLE_RX_URB, /* firmware bug */
1637 },
1638 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1639 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1640 },
1641 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1642 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1643 },
1644 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1645 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1646 },
1647 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1648 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1649 },
1650 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1651 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1652 },
1653 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1654 },
1655 /* Motorola H24 HSPA module: */
1656 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1657 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1658 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1659 },
1660 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1661 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1662 },
1663 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1664 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1665 },
1666 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1667 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1668 },
1669 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1670 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1671 },
1672 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1673 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1674 },
1675 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1676 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1677 },
1678
1679 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1680 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1681 data interface instead of
1682 communications interface.
1683 Maybe we should define a new
1684 quirk for this. */
1685 },
1686 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1687 .driver_info = NO_UNION_NORMAL,
1688 },
1689 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1690 .driver_info = NO_UNION_NORMAL,
1691 },
1692 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1693 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1694 },
1695 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1696 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1697 },
1698
1699 /* Nokia S60 phones expose two ACM channels. The first is
1700 * a modem and is picked up by the standard AT-command
1701 * information below. The second is 'vendor-specific' but
1702 * is treated as a serial device at the S60 end, so we want
1703 * to expose it on Linux too. */
1704 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1705 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1706 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1707 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1708 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1709 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1710 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1711 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1712 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1713 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1714 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1715 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1716 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1717 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1718 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1719 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1720 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1721 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1722 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1723 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1724 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1725 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1726 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1727 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1728 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1729 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1730 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1731 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1732 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1733 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1734 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1735 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1736 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1737 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1738 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1739 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1740 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1741 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1742 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1743 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1744 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1745 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1746 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1747 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1748 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1749 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1750 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1751 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1752 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1753 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1754 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1755 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1756 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1757 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1758 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1759 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1760 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1761 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1762
1763 /* Support for Owen devices */
1764 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1765
1766 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1767
1768 /* Support Lego NXT using pbLua firmware */
1769 { USB_DEVICE(0x0694, 0xff00),
1770 .driver_info = NOT_A_MODEM,
1771 },
1772
1773 /* Support for Droids MuIn LCD */
1774 { USB_DEVICE(0x04d8, 0x000b),
1775 .driver_info = NO_DATA_INTERFACE,
1776 },
1777
1778 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1779 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1780 .driver_info = IGNORE_DEVICE,
1781 },
1782 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1783 .driver_info = IGNORE_DEVICE,
1784 },
1785 #endif
1786
1787 /* control interfaces without any protocol set */
1788 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1789 USB_CDC_PROTO_NONE) },
1790
1791 /* control interfaces with various AT-command sets */
1792 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1793 USB_CDC_ACM_PROTO_AT_V25TER) },
1794 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1795 USB_CDC_ACM_PROTO_AT_PCCA101) },
1796 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1797 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1798 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1799 USB_CDC_ACM_PROTO_AT_GSM) },
1800 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1801 USB_CDC_ACM_PROTO_AT_3G) },
1802 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1803 USB_CDC_ACM_PROTO_AT_CDMA) },
1804
1805 { }
1806 };
1807
1808 MODULE_DEVICE_TABLE(usb, acm_ids);
1809
1810 static struct usb_driver acm_driver = {
1811 .name = "cdc_acm",
1812 .probe = acm_probe,
1813 .disconnect = acm_disconnect,
1814 #ifdef CONFIG_PM
1815 .suspend = acm_suspend,
1816 .resume = acm_resume,
1817 .reset_resume = acm_reset_resume,
1818 #endif
1819 .id_table = acm_ids,
1820 #ifdef CONFIG_PM
1821 .supports_autosuspend = 1,
1822 #endif
1823 .disable_hub_initiated_lpm = 1,
1824 };
1825
1826 /*
1827 * TTY driver structures.
1828 */
1829
1830 static const struct tty_operations acm_ops = {
1831 .install = acm_tty_install,
1832 .open = acm_tty_open,
1833 .close = acm_tty_close,
1834 .cleanup = acm_tty_cleanup,
1835 .hangup = acm_tty_hangup,
1836 .write = acm_tty_write,
1837 .write_room = acm_tty_write_room,
1838 .ioctl = acm_tty_ioctl,
1839 .throttle = acm_tty_throttle,
1840 .unthrottle = acm_tty_unthrottle,
1841 .chars_in_buffer = acm_tty_chars_in_buffer,
1842 .break_ctl = acm_tty_break_ctl,
1843 .set_termios = acm_tty_set_termios,
1844 .tiocmget = acm_tty_tiocmget,
1845 .tiocmset = acm_tty_tiocmset,
1846 };
1847
1848 /*
1849 * Init / exit.
1850 */
1851
1852 static int __init acm_init(void)
1853 {
1854 int retval;
1855 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1856 if (!acm_tty_driver)
1857 return -ENOMEM;
1858 acm_tty_driver->driver_name = "acm",
1859 acm_tty_driver->name = "ttyACM",
1860 acm_tty_driver->major = ACM_TTY_MAJOR,
1861 acm_tty_driver->minor_start = 0,
1862 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1863 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1864 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1865 acm_tty_driver->init_termios = tty_std_termios;
1866 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1867 HUPCL | CLOCAL;
1868 tty_set_operations(acm_tty_driver, &acm_ops);
1869
1870 retval = tty_register_driver(acm_tty_driver);
1871 if (retval) {
1872 put_tty_driver(acm_tty_driver);
1873 return retval;
1874 }
1875
1876 retval = usb_register(&acm_driver);
1877 if (retval) {
1878 tty_unregister_driver(acm_tty_driver);
1879 put_tty_driver(acm_tty_driver);
1880 return retval;
1881 }
1882
1883 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1884
1885 return 0;
1886 }
1887
1888 static void __exit acm_exit(void)
1889 {
1890 usb_deregister(&acm_driver);
1891 tty_unregister_driver(acm_tty_driver);
1892 put_tty_driver(acm_tty_driver);
1893 }
1894
1895 module_init(acm_init);
1896 module_exit(acm_exit);
1897
1898 MODULE_AUTHOR(DRIVER_AUTHOR);
1899 MODULE_DESCRIPTION(DRIVER_DESC);
1900 MODULE_LICENSE("GPL");
1901 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
Linux kernel - Deliverables
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