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Merge tag 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux...
[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 static void acm_tty_set_termios(struct tty_struct *tty,
64 struct ktermios *termios_old);
65
66 /*
67 * acm_table accessors
68 */
69
70 /*
71 * Look up an ACM structure by index. If found and not disconnected, increment
72 * its refcount and return it with its mutex held.
73 */
74 static struct acm *acm_get_by_index(unsigned index)
75 {
76 struct acm *acm;
77
78 mutex_lock(&acm_table_lock);
79 acm = acm_table[index];
80 if (acm) {
81 mutex_lock(&acm->mutex);
82 if (acm->disconnected) {
83 mutex_unlock(&acm->mutex);
84 acm = NULL;
85 } else {
86 tty_port_get(&acm->port);
87 mutex_unlock(&acm->mutex);
88 }
89 }
90 mutex_unlock(&acm_table_lock);
91 return acm;
92 }
93
94 /*
95 * Try to find an available minor number and if found, associate it with 'acm'.
96 */
97 static int acm_alloc_minor(struct acm *acm)
98 {
99 int minor;
100
101 mutex_lock(&acm_table_lock);
102 for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
103 if (!acm_table[minor]) {
104 acm_table[minor] = acm;
105 break;
106 }
107 }
108 mutex_unlock(&acm_table_lock);
109
110 return minor;
111 }
112
113 /* Release the minor number associated with 'acm'. */
114 static void acm_release_minor(struct acm *acm)
115 {
116 mutex_lock(&acm_table_lock);
117 acm_table[acm->minor] = NULL;
118 mutex_unlock(&acm_table_lock);
119 }
120
121 /*
122 * Functions for ACM control messages.
123 */
124
125 static int acm_ctrl_msg(struct acm *acm, int request, int value,
126 void *buf, int len)
127 {
128 int retval;
129
130 retval = usb_autopm_get_interface(acm->control);
131 if (retval)
132 return retval;
133
134 retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
135 request, USB_RT_ACM, value,
136 acm->control->altsetting[0].desc.bInterfaceNumber,
137 buf, len, 5000);
138
139 dev_dbg(&acm->control->dev,
140 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
141 __func__, request, value, len, retval);
142
143 usb_autopm_put_interface(acm->control);
144
145 return retval < 0 ? retval : 0;
146 }
147
148 /* devices aren't required to support these requests.
149 * the cdc acm descriptor tells whether they do...
150 */
151 static inline int acm_set_control(struct acm *acm, int control)
152 {
153 if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
154 return -EOPNOTSUPP;
155
156 return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
157 control, NULL, 0);
158 }
159
160 #define acm_set_line(acm, line) \
161 acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
162 #define acm_send_break(acm, ms) \
163 acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
164
165 /*
166 * Write buffer management.
167 * All of these assume proper locks taken by the caller.
168 */
169
170 static int acm_wb_alloc(struct acm *acm)
171 {
172 int i, wbn;
173 struct acm_wb *wb;
174
175 wbn = 0;
176 i = 0;
177 for (;;) {
178 wb = &acm->wb[wbn];
179 if (!wb->use) {
180 wb->use = 1;
181 return wbn;
182 }
183 wbn = (wbn + 1) % ACM_NW;
184 if (++i >= ACM_NW)
185 return -1;
186 }
187 }
188
189 static int acm_wb_is_avail(struct acm *acm)
190 {
191 int i, n;
192 unsigned long flags;
193
194 n = ACM_NW;
195 spin_lock_irqsave(&acm->write_lock, flags);
196 for (i = 0; i < ACM_NW; i++)
197 n -= acm->wb[i].use;
198 spin_unlock_irqrestore(&acm->write_lock, flags);
199 return n;
200 }
201
202 /*
203 * Finish write. Caller must hold acm->write_lock
204 */
205 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
206 {
207 wb->use = 0;
208 acm->transmitting--;
209 usb_autopm_put_interface_async(acm->control);
210 }
211
212 /*
213 * Poke write.
214 *
215 * the caller is responsible for locking
216 */
217
218 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
219 {
220 int rc;
221
222 acm->transmitting++;
223
224 wb->urb->transfer_buffer = wb->buf;
225 wb->urb->transfer_dma = wb->dmah;
226 wb->urb->transfer_buffer_length = wb->len;
227 wb->urb->dev = acm->dev;
228
229 rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
230 if (rc < 0) {
231 dev_err(&acm->data->dev,
232 "%s - usb_submit_urb(write bulk) failed: %d\n",
233 __func__, rc);
234 acm_write_done(acm, wb);
235 }
236 return rc;
237 }
238
239 /*
240 * attributes exported through sysfs
241 */
242 static ssize_t show_caps
243 (struct device *dev, struct device_attribute *attr, char *buf)
244 {
245 struct usb_interface *intf = to_usb_interface(dev);
246 struct acm *acm = usb_get_intfdata(intf);
247
248 return sprintf(buf, "%d", acm->ctrl_caps);
249 }
250 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
251
252 static ssize_t show_country_codes
253 (struct device *dev, struct device_attribute *attr, char *buf)
254 {
255 struct usb_interface *intf = to_usb_interface(dev);
256 struct acm *acm = usb_get_intfdata(intf);
257
258 memcpy(buf, acm->country_codes, acm->country_code_size);
259 return acm->country_code_size;
260 }
261
262 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
263
264 static ssize_t show_country_rel_date
265 (struct device *dev, struct device_attribute *attr, char *buf)
266 {
267 struct usb_interface *intf = to_usb_interface(dev);
268 struct acm *acm = usb_get_intfdata(intf);
269
270 return sprintf(buf, "%d", acm->country_rel_date);
271 }
272
273 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
274 /*
275 * Interrupt handlers for various ACM device responses
276 */
277
278 /* control interface reports status changes with "interrupt" transfers */
279 static void acm_ctrl_irq(struct urb *urb)
280 {
281 struct acm *acm = urb->context;
282 struct usb_cdc_notification *dr = urb->transfer_buffer;
283 unsigned char *data;
284 int newctrl;
285 int difference;
286 int retval;
287 int status = urb->status;
288
289 switch (status) {
290 case 0:
291 /* success */
292 break;
293 case -ECONNRESET:
294 case -ENOENT:
295 case -ESHUTDOWN:
296 /* this urb is terminated, clean up */
297 dev_dbg(&acm->control->dev,
298 "%s - urb shutting down with status: %d\n",
299 __func__, status);
300 return;
301 default:
302 dev_dbg(&acm->control->dev,
303 "%s - nonzero urb status received: %d\n",
304 __func__, status);
305 goto exit;
306 }
307
308 usb_mark_last_busy(acm->dev);
309
310 data = (unsigned char *)(dr + 1);
311 switch (dr->bNotificationType) {
312 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
313 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
314 __func__, dr->wValue);
315 break;
316
317 case USB_CDC_NOTIFY_SERIAL_STATE:
318 newctrl = get_unaligned_le16(data);
319
320 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
321 dev_dbg(&acm->control->dev, "%s - calling hangup\n",
322 __func__);
323 tty_port_tty_hangup(&acm->port, false);
324 }
325
326 difference = acm->ctrlin ^ newctrl;
327 spin_lock(&acm->read_lock);
328 acm->ctrlin = newctrl;
329 acm->oldcount = acm->iocount;
330
331 if (difference & ACM_CTRL_DSR)
332 acm->iocount.dsr++;
333 if (difference & ACM_CTRL_BRK)
334 acm->iocount.brk++;
335 if (difference & ACM_CTRL_RI)
336 acm->iocount.rng++;
337 if (difference & ACM_CTRL_DCD)
338 acm->iocount.dcd++;
339 if (difference & ACM_CTRL_FRAMING)
340 acm->iocount.frame++;
341 if (difference & ACM_CTRL_PARITY)
342 acm->iocount.parity++;
343 if (difference & ACM_CTRL_OVERRUN)
344 acm->iocount.overrun++;
345 spin_unlock(&acm->read_lock);
346
347 if (difference)
348 wake_up_all(&acm->wioctl);
349
350 break;
351
352 default:
353 dev_dbg(&acm->control->dev,
354 "%s - unknown notification %d received: index %d "
355 "len %d data0 %d data1 %d\n",
356 __func__,
357 dr->bNotificationType, dr->wIndex,
358 dr->wLength, data[0], data[1]);
359 break;
360 }
361 exit:
362 retval = usb_submit_urb(urb, GFP_ATOMIC);
363 if (retval && retval != -EPERM)
364 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
365 __func__, retval);
366 }
367
368 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
369 {
370 int res;
371
372 if (!test_and_clear_bit(index, &acm->read_urbs_free))
373 return 0;
374
375 dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
376
377 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
378 if (res) {
379 if (res != -EPERM) {
380 dev_err(&acm->data->dev,
381 "%s - usb_submit_urb failed: %d\n",
382 __func__, res);
383 }
384 set_bit(index, &acm->read_urbs_free);
385 return res;
386 }
387
388 return 0;
389 }
390
391 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
392 {
393 int res;
394 int i;
395
396 for (i = 0; i < acm->rx_buflimit; ++i) {
397 res = acm_submit_read_urb(acm, i, mem_flags);
398 if (res)
399 return res;
400 }
401
402 return 0;
403 }
404
405 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
406 {
407 if (!urb->actual_length)
408 return;
409
410 tty_insert_flip_string(&acm->port, urb->transfer_buffer,
411 urb->actual_length);
412 tty_flip_buffer_push(&acm->port);
413 }
414
415 static void acm_read_bulk_callback(struct urb *urb)
416 {
417 struct acm_rb *rb = urb->context;
418 struct acm *acm = rb->instance;
419 unsigned long flags;
420 int status = urb->status;
421
422 dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
423 rb->index, urb->actual_length);
424
425 if (!acm->dev) {
426 set_bit(rb->index, &acm->read_urbs_free);
427 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
428 return;
429 }
430
431 if (status) {
432 set_bit(rb->index, &acm->read_urbs_free);
433 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
434 __func__, status);
435 return;
436 }
437
438 usb_mark_last_busy(acm->dev);
439
440 acm_process_read_urb(acm, urb);
441 /*
442 * Unthrottle may run on another CPU which needs to see events
443 * in the same order. Submission has an implict barrier
444 */
445 smp_mb__before_atomic();
446 set_bit(rb->index, &acm->read_urbs_free);
447
448 /* throttle device if requested by tty */
449 spin_lock_irqsave(&acm->read_lock, flags);
450 acm->throttled = acm->throttle_req;
451 if (!acm->throttled) {
452 spin_unlock_irqrestore(&acm->read_lock, flags);
453 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
454 } else {
455 spin_unlock_irqrestore(&acm->read_lock, flags);
456 }
457 }
458
459 /* data interface wrote those outgoing bytes */
460 static void acm_write_bulk(struct urb *urb)
461 {
462 struct acm_wb *wb = urb->context;
463 struct acm *acm = wb->instance;
464 unsigned long flags;
465 int status = urb->status;
466
467 if (status || (urb->actual_length != urb->transfer_buffer_length))
468 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
469 __func__,
470 urb->actual_length,
471 urb->transfer_buffer_length,
472 status);
473
474 spin_lock_irqsave(&acm->write_lock, flags);
475 acm_write_done(acm, wb);
476 spin_unlock_irqrestore(&acm->write_lock, flags);
477 schedule_work(&acm->work);
478 }
479
480 static void acm_softint(struct work_struct *work)
481 {
482 struct acm *acm = container_of(work, struct acm, work);
483
484 dev_vdbg(&acm->data->dev, "%s\n", __func__);
485
486 tty_port_tty_wakeup(&acm->port);
487 }
488
489 /*
490 * TTY handlers
491 */
492
493 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
494 {
495 struct acm *acm;
496 int retval;
497
498 dev_dbg(tty->dev, "%s\n", __func__);
499
500 acm = acm_get_by_index(tty->index);
501 if (!acm)
502 return -ENODEV;
503
504 retval = tty_standard_install(driver, tty);
505 if (retval)
506 goto error_init_termios;
507
508 tty->driver_data = acm;
509
510 return 0;
511
512 error_init_termios:
513 tty_port_put(&acm->port);
514 return retval;
515 }
516
517 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
518 {
519 struct acm *acm = tty->driver_data;
520
521 dev_dbg(tty->dev, "%s\n", __func__);
522
523 return tty_port_open(&acm->port, tty, filp);
524 }
525
526 static void acm_port_dtr_rts(struct tty_port *port, int raise)
527 {
528 struct acm *acm = container_of(port, struct acm, port);
529 int val;
530 int res;
531
532 if (raise)
533 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
534 else
535 val = 0;
536
537 /* FIXME: add missing ctrlout locking throughout driver */
538 acm->ctrlout = val;
539
540 res = acm_set_control(acm, val);
541 if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
542 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
543 }
544
545 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
546 {
547 struct acm *acm = container_of(port, struct acm, port);
548 int retval = -ENODEV;
549 int i;
550
551 dev_dbg(&acm->control->dev, "%s\n", __func__);
552
553 mutex_lock(&acm->mutex);
554 if (acm->disconnected)
555 goto disconnected;
556
557 retval = usb_autopm_get_interface(acm->control);
558 if (retval)
559 goto error_get_interface;
560
561 /*
562 * FIXME: Why do we need this? Allocating 64K of physically contiguous
563 * memory is really nasty...
564 */
565 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
566 acm->control->needs_remote_wakeup = 1;
567
568 acm->ctrlurb->dev = acm->dev;
569 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
570 if (retval) {
571 dev_err(&acm->control->dev,
572 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
573 goto error_submit_urb;
574 }
575
576 acm_tty_set_termios(tty, NULL);
577
578 /*
579 * Unthrottle device in case the TTY was closed while throttled.
580 */
581 spin_lock_irq(&acm->read_lock);
582 acm->throttled = 0;
583 acm->throttle_req = 0;
584 spin_unlock_irq(&acm->read_lock);
585
586 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
587 if (retval)
588 goto error_submit_read_urbs;
589
590 usb_autopm_put_interface(acm->control);
591
592 mutex_unlock(&acm->mutex);
593
594 return 0;
595
596 error_submit_read_urbs:
597 for (i = 0; i < acm->rx_buflimit; i++)
598 usb_kill_urb(acm->read_urbs[i]);
599 usb_kill_urb(acm->ctrlurb);
600 error_submit_urb:
601 usb_autopm_put_interface(acm->control);
602 error_get_interface:
603 disconnected:
604 mutex_unlock(&acm->mutex);
605
606 return usb_translate_errors(retval);
607 }
608
609 static void acm_port_destruct(struct tty_port *port)
610 {
611 struct acm *acm = container_of(port, struct acm, port);
612
613 dev_dbg(&acm->control->dev, "%s\n", __func__);
614
615 acm_release_minor(acm);
616 usb_put_intf(acm->control);
617 kfree(acm->country_codes);
618 kfree(acm);
619 }
620
621 static void acm_port_shutdown(struct tty_port *port)
622 {
623 struct acm *acm = container_of(port, struct acm, port);
624 struct urb *urb;
625 struct acm_wb *wb;
626 int i;
627
628 dev_dbg(&acm->control->dev, "%s\n", __func__);
629
630 /*
631 * Need to grab write_lock to prevent race with resume, but no need to
632 * hold it due to the tty-port initialised flag.
633 */
634 spin_lock_irq(&acm->write_lock);
635 spin_unlock_irq(&acm->write_lock);
636
637 usb_autopm_get_interface_no_resume(acm->control);
638 acm->control->needs_remote_wakeup = 0;
639 usb_autopm_put_interface(acm->control);
640
641 for (;;) {
642 urb = usb_get_from_anchor(&acm->delayed);
643 if (!urb)
644 break;
645 wb = urb->context;
646 wb->use = 0;
647 usb_autopm_put_interface_async(acm->control);
648 }
649
650 usb_kill_urb(acm->ctrlurb);
651 for (i = 0; i < ACM_NW; i++)
652 usb_kill_urb(acm->wb[i].urb);
653 for (i = 0; i < acm->rx_buflimit; i++)
654 usb_kill_urb(acm->read_urbs[i]);
655 }
656
657 static void acm_tty_cleanup(struct tty_struct *tty)
658 {
659 struct acm *acm = tty->driver_data;
660 dev_dbg(&acm->control->dev, "%s\n", __func__);
661 tty_port_put(&acm->port);
662 }
663
664 static void acm_tty_hangup(struct tty_struct *tty)
665 {
666 struct acm *acm = tty->driver_data;
667 dev_dbg(&acm->control->dev, "%s\n", __func__);
668 tty_port_hangup(&acm->port);
669 }
670
671 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
672 {
673 struct acm *acm = tty->driver_data;
674 dev_dbg(&acm->control->dev, "%s\n", __func__);
675 tty_port_close(&acm->port, tty, filp);
676 }
677
678 static int acm_tty_write(struct tty_struct *tty,
679 const unsigned char *buf, int count)
680 {
681 struct acm *acm = tty->driver_data;
682 int stat;
683 unsigned long flags;
684 int wbn;
685 struct acm_wb *wb;
686
687 if (!count)
688 return 0;
689
690 dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
691
692 spin_lock_irqsave(&acm->write_lock, flags);
693 wbn = acm_wb_alloc(acm);
694 if (wbn < 0) {
695 spin_unlock_irqrestore(&acm->write_lock, flags);
696 return 0;
697 }
698 wb = &acm->wb[wbn];
699
700 if (!acm->dev) {
701 wb->use = 0;
702 spin_unlock_irqrestore(&acm->write_lock, flags);
703 return -ENODEV;
704 }
705
706 count = (count > acm->writesize) ? acm->writesize : count;
707 dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
708 memcpy(wb->buf, buf, count);
709 wb->len = count;
710
711 stat = usb_autopm_get_interface_async(acm->control);
712 if (stat) {
713 wb->use = 0;
714 spin_unlock_irqrestore(&acm->write_lock, flags);
715 return stat;
716 }
717
718 if (acm->susp_count) {
719 usb_anchor_urb(wb->urb, &acm->delayed);
720 spin_unlock_irqrestore(&acm->write_lock, flags);
721 return count;
722 }
723
724 stat = acm_start_wb(acm, wb);
725 spin_unlock_irqrestore(&acm->write_lock, flags);
726
727 if (stat < 0)
728 return stat;
729 return count;
730 }
731
732 static int acm_tty_write_room(struct tty_struct *tty)
733 {
734 struct acm *acm = tty->driver_data;
735 /*
736 * Do not let the line discipline to know that we have a reserve,
737 * or it might get too enthusiastic.
738 */
739 return acm_wb_is_avail(acm) ? acm->writesize : 0;
740 }
741
742 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
743 {
744 struct acm *acm = tty->driver_data;
745 /*
746 * if the device was unplugged then any remaining characters fell out
747 * of the connector ;)
748 */
749 if (acm->disconnected)
750 return 0;
751 /*
752 * This is inaccurate (overcounts), but it works.
753 */
754 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
755 }
756
757 static void acm_tty_throttle(struct tty_struct *tty)
758 {
759 struct acm *acm = tty->driver_data;
760
761 spin_lock_irq(&acm->read_lock);
762 acm->throttle_req = 1;
763 spin_unlock_irq(&acm->read_lock);
764 }
765
766 static void acm_tty_unthrottle(struct tty_struct *tty)
767 {
768 struct acm *acm = tty->driver_data;
769 unsigned int was_throttled;
770
771 spin_lock_irq(&acm->read_lock);
772 was_throttled = acm->throttled;
773 acm->throttled = 0;
774 acm->throttle_req = 0;
775 spin_unlock_irq(&acm->read_lock);
776
777 if (was_throttled)
778 acm_submit_read_urbs(acm, GFP_KERNEL);
779 }
780
781 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
782 {
783 struct acm *acm = tty->driver_data;
784 int retval;
785
786 retval = acm_send_break(acm, state ? 0xffff : 0);
787 if (retval < 0)
788 dev_dbg(&acm->control->dev, "%s - send break failed\n",
789 __func__);
790 return retval;
791 }
792
793 static int acm_tty_tiocmget(struct tty_struct *tty)
794 {
795 struct acm *acm = tty->driver_data;
796
797 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
798 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
799 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
800 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
801 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
802 TIOCM_CTS;
803 }
804
805 static int acm_tty_tiocmset(struct tty_struct *tty,
806 unsigned int set, unsigned int clear)
807 {
808 struct acm *acm = tty->driver_data;
809 unsigned int newctrl;
810
811 newctrl = acm->ctrlout;
812 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
813 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
814 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
815 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
816
817 newctrl = (newctrl & ~clear) | set;
818
819 if (acm->ctrlout == newctrl)
820 return 0;
821 return acm_set_control(acm, acm->ctrlout = newctrl);
822 }
823
824 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
825 {
826 struct serial_struct tmp;
827
828 if (!info)
829 return -EINVAL;
830
831 memset(&tmp, 0, sizeof(tmp));
832 tmp.flags = ASYNC_LOW_LATENCY;
833 tmp.xmit_fifo_size = acm->writesize;
834 tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
835 tmp.close_delay = acm->port.close_delay / 10;
836 tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
837 ASYNC_CLOSING_WAIT_NONE :
838 acm->port.closing_wait / 10;
839
840 if (copy_to_user(info, &tmp, sizeof(tmp)))
841 return -EFAULT;
842 else
843 return 0;
844 }
845
846 static int set_serial_info(struct acm *acm,
847 struct serial_struct __user *newinfo)
848 {
849 struct serial_struct new_serial;
850 unsigned int closing_wait, close_delay;
851 int retval = 0;
852
853 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
854 return -EFAULT;
855
856 close_delay = new_serial.close_delay * 10;
857 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
858 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
859
860 mutex_lock(&acm->port.mutex);
861
862 if (!capable(CAP_SYS_ADMIN)) {
863 if ((close_delay != acm->port.close_delay) ||
864 (closing_wait != acm->port.closing_wait))
865 retval = -EPERM;
866 else
867 retval = -EOPNOTSUPP;
868 } else {
869 acm->port.close_delay = close_delay;
870 acm->port.closing_wait = closing_wait;
871 }
872
873 mutex_unlock(&acm->port.mutex);
874 return retval;
875 }
876
877 static int wait_serial_change(struct acm *acm, unsigned long arg)
878 {
879 int rv = 0;
880 DECLARE_WAITQUEUE(wait, current);
881 struct async_icount old, new;
882
883 if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
884 return -EINVAL;
885 do {
886 spin_lock_irq(&acm->read_lock);
887 old = acm->oldcount;
888 new = acm->iocount;
889 acm->oldcount = new;
890 spin_unlock_irq(&acm->read_lock);
891
892 if ((arg & TIOCM_DSR) &&
893 old.dsr != new.dsr)
894 break;
895 if ((arg & TIOCM_CD) &&
896 old.dcd != new.dcd)
897 break;
898 if ((arg & TIOCM_RI) &&
899 old.rng != new.rng)
900 break;
901
902 add_wait_queue(&acm->wioctl, &wait);
903 set_current_state(TASK_INTERRUPTIBLE);
904 schedule();
905 remove_wait_queue(&acm->wioctl, &wait);
906 if (acm->disconnected) {
907 if (arg & TIOCM_CD)
908 break;
909 else
910 rv = -ENODEV;
911 } else {
912 if (signal_pending(current))
913 rv = -ERESTARTSYS;
914 }
915 } while (!rv);
916
917
918
919 return rv;
920 }
921
922 static int get_serial_usage(struct acm *acm,
923 struct serial_icounter_struct __user *count)
924 {
925 struct serial_icounter_struct icount;
926 int rv = 0;
927
928 memset(&icount, 0, sizeof(icount));
929 icount.dsr = acm->iocount.dsr;
930 icount.rng = acm->iocount.rng;
931 icount.dcd = acm->iocount.dcd;
932 icount.frame = acm->iocount.frame;
933 icount.overrun = acm->iocount.overrun;
934 icount.parity = acm->iocount.parity;
935 icount.brk = acm->iocount.brk;
936
937 if (copy_to_user(count, &icount, sizeof(icount)) > 0)
938 rv = -EFAULT;
939
940 return rv;
941 }
942
943 static int acm_tty_ioctl(struct tty_struct *tty,
944 unsigned int cmd, unsigned long arg)
945 {
946 struct acm *acm = tty->driver_data;
947 int rv = -ENOIOCTLCMD;
948
949 switch (cmd) {
950 case TIOCGSERIAL: /* gets serial port data */
951 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
952 break;
953 case TIOCSSERIAL:
954 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
955 break;
956 case TIOCMIWAIT:
957 rv = usb_autopm_get_interface(acm->control);
958 if (rv < 0) {
959 rv = -EIO;
960 break;
961 }
962 rv = wait_serial_change(acm, arg);
963 usb_autopm_put_interface(acm->control);
964 break;
965 case TIOCGICOUNT:
966 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
967 break;
968 }
969
970 return rv;
971 }
972
973 static void acm_tty_set_termios(struct tty_struct *tty,
974 struct ktermios *termios_old)
975 {
976 struct acm *acm = tty->driver_data;
977 struct ktermios *termios = &tty->termios;
978 struct usb_cdc_line_coding newline;
979 int newctrl = acm->ctrlout;
980
981 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
982 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
983 newline.bParityType = termios->c_cflag & PARENB ?
984 (termios->c_cflag & PARODD ? 1 : 2) +
985 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
986 switch (termios->c_cflag & CSIZE) {
987 case CS5:
988 newline.bDataBits = 5;
989 break;
990 case CS6:
991 newline.bDataBits = 6;
992 break;
993 case CS7:
994 newline.bDataBits = 7;
995 break;
996 case CS8:
997 default:
998 newline.bDataBits = 8;
999 break;
1000 }
1001 /* FIXME: Needs to clear unsupported bits in the termios */
1002 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1003
1004 if (C_BAUD(tty) == B0) {
1005 newline.dwDTERate = acm->line.dwDTERate;
1006 newctrl &= ~ACM_CTRL_DTR;
1007 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1008 newctrl |= ACM_CTRL_DTR;
1009 }
1010
1011 if (newctrl != acm->ctrlout)
1012 acm_set_control(acm, acm->ctrlout = newctrl);
1013
1014 if (memcmp(&acm->line, &newline, sizeof newline)) {
1015 memcpy(&acm->line, &newline, sizeof newline);
1016 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1017 __func__,
1018 le32_to_cpu(newline.dwDTERate),
1019 newline.bCharFormat, newline.bParityType,
1020 newline.bDataBits);
1021 acm_set_line(acm, &acm->line);
1022 }
1023 }
1024
1025 static const struct tty_port_operations acm_port_ops = {
1026 .dtr_rts = acm_port_dtr_rts,
1027 .shutdown = acm_port_shutdown,
1028 .activate = acm_port_activate,
1029 .destruct = acm_port_destruct,
1030 };
1031
1032 /*
1033 * USB probe and disconnect routines.
1034 */
1035
1036 /* Little helpers: write/read buffers free */
1037 static void acm_write_buffers_free(struct acm *acm)
1038 {
1039 int i;
1040 struct acm_wb *wb;
1041 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1042
1043 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1044 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1045 }
1046
1047 static void acm_read_buffers_free(struct acm *acm)
1048 {
1049 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1050 int i;
1051
1052 for (i = 0; i < acm->rx_buflimit; i++)
1053 usb_free_coherent(usb_dev, acm->readsize,
1054 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1055 }
1056
1057 /* Little helper: write buffers allocate */
1058 static int acm_write_buffers_alloc(struct acm *acm)
1059 {
1060 int i;
1061 struct acm_wb *wb;
1062
1063 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1064 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1065 &wb->dmah);
1066 if (!wb->buf) {
1067 while (i != 0) {
1068 --i;
1069 --wb;
1070 usb_free_coherent(acm->dev, acm->writesize,
1071 wb->buf, wb->dmah);
1072 }
1073 return -ENOMEM;
1074 }
1075 }
1076 return 0;
1077 }
1078
1079 static int acm_probe(struct usb_interface *intf,
1080 const struct usb_device_id *id)
1081 {
1082 struct usb_cdc_union_desc *union_header = NULL;
1083 struct usb_cdc_country_functional_desc *cfd = NULL;
1084 unsigned char *buffer = intf->altsetting->extra;
1085 int buflen = intf->altsetting->extralen;
1086 struct usb_interface *control_interface;
1087 struct usb_interface *data_interface;
1088 struct usb_endpoint_descriptor *epctrl = NULL;
1089 struct usb_endpoint_descriptor *epread = NULL;
1090 struct usb_endpoint_descriptor *epwrite = NULL;
1091 struct usb_device *usb_dev = interface_to_usbdev(intf);
1092 struct acm *acm;
1093 int minor;
1094 int ctrlsize, readsize;
1095 u8 *buf;
1096 u8 ac_management_function = 0;
1097 u8 call_management_function = 0;
1098 int call_interface_num = -1;
1099 int data_interface_num = -1;
1100 unsigned long quirks;
1101 int num_rx_buf;
1102 int i;
1103 unsigned int elength = 0;
1104 int combined_interfaces = 0;
1105 struct device *tty_dev;
1106 int rv = -ENOMEM;
1107
1108 /* normal quirks */
1109 quirks = (unsigned long)id->driver_info;
1110
1111 if (quirks == IGNORE_DEVICE)
1112 return -ENODEV;
1113
1114 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1115
1116 /* handle quirks deadly to normal probing*/
1117 if (quirks == NO_UNION_NORMAL) {
1118 data_interface = usb_ifnum_to_if(usb_dev, 1);
1119 control_interface = usb_ifnum_to_if(usb_dev, 0);
1120 goto skip_normal_probe;
1121 }
1122
1123 /* normal probing*/
1124 if (!buffer) {
1125 dev_err(&intf->dev, "Weird descriptor references\n");
1126 return -EINVAL;
1127 }
1128
1129 if (!buflen) {
1130 if (intf->cur_altsetting->endpoint &&
1131 intf->cur_altsetting->endpoint->extralen &&
1132 intf->cur_altsetting->endpoint->extra) {
1133 dev_dbg(&intf->dev,
1134 "Seeking extra descriptors on endpoint\n");
1135 buflen = intf->cur_altsetting->endpoint->extralen;
1136 buffer = intf->cur_altsetting->endpoint->extra;
1137 } else {
1138 dev_err(&intf->dev,
1139 "Zero length descriptor references\n");
1140 return -EINVAL;
1141 }
1142 }
1143
1144 while (buflen > 0) {
1145 if (buffer[1] != USB_DT_CS_INTERFACE) {
1146 dev_err(&intf->dev, "skipping garbage\n");
1147 goto next_desc;
1148 }
1149 elength = buffer[0];
1150
1151 switch (buffer[2]) {
1152 case USB_CDC_UNION_TYPE: /* we've found it */
1153 if (elength < sizeof(struct usb_cdc_union_desc))
1154 goto next_desc;
1155 if (union_header) {
1156 dev_err(&intf->dev, "More than one "
1157 "union descriptor, skipping ...\n");
1158 goto next_desc;
1159 }
1160 union_header = (struct usb_cdc_union_desc *)buffer;
1161 break;
1162 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1163 if (elength < sizeof(struct usb_cdc_country_functional_desc))
1164 goto next_desc;
1165 cfd = (struct usb_cdc_country_functional_desc *)buffer;
1166 break;
1167 case USB_CDC_HEADER_TYPE: /* maybe check version */
1168 break; /* for now we ignore it */
1169 case USB_CDC_ACM_TYPE:
1170 if (elength < 4)
1171 goto next_desc;
1172 ac_management_function = buffer[3];
1173 break;
1174 case USB_CDC_CALL_MANAGEMENT_TYPE:
1175 if (elength < 5)
1176 goto next_desc;
1177 call_management_function = buffer[3];
1178 call_interface_num = buffer[4];
1179 break;
1180 default:
1181 /*
1182 * there are LOTS more CDC descriptors that
1183 * could legitimately be found here.
1184 */
1185 dev_dbg(&intf->dev, "Ignoring descriptor: "
1186 "type %02x, length %ud\n",
1187 buffer[2], elength);
1188 break;
1189 }
1190 next_desc:
1191 buflen -= elength;
1192 buffer += elength;
1193 }
1194
1195 if (!union_header) {
1196 if (call_interface_num > 0) {
1197 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1198 /* quirks for Droids MuIn LCD */
1199 if (quirks & NO_DATA_INTERFACE)
1200 data_interface = usb_ifnum_to_if(usb_dev, 0);
1201 else
1202 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1203 control_interface = intf;
1204 } else {
1205 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1206 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1207 return -ENODEV;
1208 } else {
1209 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1210 combined_interfaces = 1;
1211 control_interface = data_interface = intf;
1212 goto look_for_collapsed_interface;
1213 }
1214 }
1215 } else {
1216 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1217 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1218 }
1219
1220 if (!control_interface || !data_interface) {
1221 dev_dbg(&intf->dev, "no interfaces\n");
1222 return -ENODEV;
1223 }
1224
1225 if (data_interface_num != call_interface_num)
1226 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1227
1228 if (control_interface == data_interface) {
1229 /* some broken devices designed for windows work this way */
1230 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1231 combined_interfaces = 1;
1232 /* a popular other OS doesn't use it */
1233 quirks |= NO_CAP_LINE;
1234 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1235 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1236 return -EINVAL;
1237 }
1238 look_for_collapsed_interface:
1239 for (i = 0; i < 3; i++) {
1240 struct usb_endpoint_descriptor *ep;
1241 ep = &data_interface->cur_altsetting->endpoint[i].desc;
1242
1243 if (usb_endpoint_is_int_in(ep))
1244 epctrl = ep;
1245 else if (usb_endpoint_is_bulk_out(ep))
1246 epwrite = ep;
1247 else if (usb_endpoint_is_bulk_in(ep))
1248 epread = ep;
1249 else
1250 return -EINVAL;
1251 }
1252 if (!epctrl || !epread || !epwrite)
1253 return -ENODEV;
1254 else
1255 goto made_compressed_probe;
1256 }
1257
1258 skip_normal_probe:
1259
1260 /*workaround for switched interfaces */
1261 if (data_interface->cur_altsetting->desc.bInterfaceClass
1262 != CDC_DATA_INTERFACE_TYPE) {
1263 if (control_interface->cur_altsetting->desc.bInterfaceClass
1264 == CDC_DATA_INTERFACE_TYPE) {
1265 struct usb_interface *t;
1266 dev_dbg(&intf->dev,
1267 "Your device has switched interfaces.\n");
1268 t = control_interface;
1269 control_interface = data_interface;
1270 data_interface = t;
1271 } else {
1272 return -EINVAL;
1273 }
1274 }
1275
1276 /* Accept probe requests only for the control interface */
1277 if (!combined_interfaces && intf != control_interface)
1278 return -ENODEV;
1279
1280 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1281 /* valid in this context */
1282 dev_dbg(&intf->dev, "The data interface isn't available\n");
1283 return -EBUSY;
1284 }
1285
1286
1287 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1288 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1289 return -EINVAL;
1290
1291 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1292 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1293 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1294
1295
1296 /* workaround for switched endpoints */
1297 if (!usb_endpoint_dir_in(epread)) {
1298 /* descriptors are swapped */
1299 struct usb_endpoint_descriptor *t;
1300 dev_dbg(&intf->dev,
1301 "The data interface has switched endpoints\n");
1302 t = epread;
1303 epread = epwrite;
1304 epwrite = t;
1305 }
1306 made_compressed_probe:
1307 dev_dbg(&intf->dev, "interfaces are valid\n");
1308
1309 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1310 if (acm == NULL)
1311 goto alloc_fail;
1312
1313 minor = acm_alloc_minor(acm);
1314 if (minor == ACM_TTY_MINORS) {
1315 dev_err(&intf->dev, "no more free acm devices\n");
1316 kfree(acm);
1317 return -ENODEV;
1318 }
1319
1320 ctrlsize = usb_endpoint_maxp(epctrl);
1321 readsize = usb_endpoint_maxp(epread) *
1322 (quirks == SINGLE_RX_URB ? 1 : 2);
1323 acm->combined_interfaces = combined_interfaces;
1324 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1325 acm->control = control_interface;
1326 acm->data = data_interface;
1327 acm->minor = minor;
1328 acm->dev = usb_dev;
1329 acm->ctrl_caps = ac_management_function;
1330 if (quirks & NO_CAP_LINE)
1331 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1332 acm->ctrlsize = ctrlsize;
1333 acm->readsize = readsize;
1334 acm->rx_buflimit = num_rx_buf;
1335 INIT_WORK(&acm->work, acm_softint);
1336 init_waitqueue_head(&acm->wioctl);
1337 spin_lock_init(&acm->write_lock);
1338 spin_lock_init(&acm->read_lock);
1339 mutex_init(&acm->mutex);
1340 acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1341 acm->is_int_ep = usb_endpoint_xfer_int(epread);
1342 if (acm->is_int_ep)
1343 acm->bInterval = epread->bInterval;
1344 tty_port_init(&acm->port);
1345 acm->port.ops = &acm_port_ops;
1346 init_usb_anchor(&acm->delayed);
1347 acm->quirks = quirks;
1348
1349 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1350 if (!buf)
1351 goto alloc_fail2;
1352 acm->ctrl_buffer = buf;
1353
1354 if (acm_write_buffers_alloc(acm) < 0)
1355 goto alloc_fail4;
1356
1357 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1358 if (!acm->ctrlurb)
1359 goto alloc_fail5;
1360
1361 for (i = 0; i < num_rx_buf; i++) {
1362 struct acm_rb *rb = &(acm->read_buffers[i]);
1363 struct urb *urb;
1364
1365 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1366 &rb->dma);
1367 if (!rb->base)
1368 goto alloc_fail6;
1369 rb->index = i;
1370 rb->instance = acm;
1371
1372 urb = usb_alloc_urb(0, GFP_KERNEL);
1373 if (!urb)
1374 goto alloc_fail6;
1375
1376 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1377 urb->transfer_dma = rb->dma;
1378 if (acm->is_int_ep) {
1379 usb_fill_int_urb(urb, acm->dev,
1380 acm->rx_endpoint,
1381 rb->base,
1382 acm->readsize,
1383 acm_read_bulk_callback, rb,
1384 acm->bInterval);
1385 } else {
1386 usb_fill_bulk_urb(urb, acm->dev,
1387 acm->rx_endpoint,
1388 rb->base,
1389 acm->readsize,
1390 acm_read_bulk_callback, rb);
1391 }
1392
1393 acm->read_urbs[i] = urb;
1394 __set_bit(i, &acm->read_urbs_free);
1395 }
1396 for (i = 0; i < ACM_NW; i++) {
1397 struct acm_wb *snd = &(acm->wb[i]);
1398
1399 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1400 if (snd->urb == NULL)
1401 goto alloc_fail7;
1402
1403 if (usb_endpoint_xfer_int(epwrite))
1404 usb_fill_int_urb(snd->urb, usb_dev,
1405 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1406 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1407 else
1408 usb_fill_bulk_urb(snd->urb, usb_dev,
1409 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1410 NULL, acm->writesize, acm_write_bulk, snd);
1411 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1412 snd->instance = acm;
1413 }
1414
1415 usb_set_intfdata(intf, acm);
1416
1417 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1418 if (i < 0)
1419 goto alloc_fail7;
1420
1421 if (cfd) { /* export the country data */
1422 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1423 if (!acm->country_codes)
1424 goto skip_countries;
1425 acm->country_code_size = cfd->bLength - 4;
1426 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1427 cfd->bLength - 4);
1428 acm->country_rel_date = cfd->iCountryCodeRelDate;
1429
1430 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1431 if (i < 0) {
1432 kfree(acm->country_codes);
1433 acm->country_codes = NULL;
1434 acm->country_code_size = 0;
1435 goto skip_countries;
1436 }
1437
1438 i = device_create_file(&intf->dev,
1439 &dev_attr_iCountryCodeRelDate);
1440 if (i < 0) {
1441 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1442 kfree(acm->country_codes);
1443 acm->country_codes = NULL;
1444 acm->country_code_size = 0;
1445 goto skip_countries;
1446 }
1447 }
1448
1449 skip_countries:
1450 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1451 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1452 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1453 /* works around buggy devices */
1454 epctrl->bInterval ? epctrl->bInterval : 16);
1455 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1456 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1457
1458 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1459
1460 acm->line.dwDTERate = cpu_to_le32(9600);
1461 acm->line.bDataBits = 8;
1462 acm_set_line(acm, &acm->line);
1463
1464 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1465 usb_set_intfdata(data_interface, acm);
1466
1467 usb_get_intf(control_interface);
1468 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1469 &control_interface->dev);
1470 if (IS_ERR(tty_dev)) {
1471 rv = PTR_ERR(tty_dev);
1472 goto alloc_fail8;
1473 }
1474
1475 return 0;
1476 alloc_fail8:
1477 if (acm->country_codes) {
1478 device_remove_file(&acm->control->dev,
1479 &dev_attr_wCountryCodes);
1480 device_remove_file(&acm->control->dev,
1481 &dev_attr_iCountryCodeRelDate);
1482 kfree(acm->country_codes);
1483 }
1484 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1485 alloc_fail7:
1486 usb_set_intfdata(intf, NULL);
1487 for (i = 0; i < ACM_NW; i++)
1488 usb_free_urb(acm->wb[i].urb);
1489 alloc_fail6:
1490 for (i = 0; i < num_rx_buf; i++)
1491 usb_free_urb(acm->read_urbs[i]);
1492 acm_read_buffers_free(acm);
1493 usb_free_urb(acm->ctrlurb);
1494 alloc_fail5:
1495 acm_write_buffers_free(acm);
1496 alloc_fail4:
1497 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1498 alloc_fail2:
1499 acm_release_minor(acm);
1500 kfree(acm);
1501 alloc_fail:
1502 return rv;
1503 }
1504
1505 static void stop_data_traffic(struct acm *acm)
1506 {
1507 int i;
1508
1509 dev_dbg(&acm->control->dev, "%s\n", __func__);
1510
1511 usb_kill_urb(acm->ctrlurb);
1512 for (i = 0; i < ACM_NW; i++)
1513 usb_kill_urb(acm->wb[i].urb);
1514 for (i = 0; i < acm->rx_buflimit; i++)
1515 usb_kill_urb(acm->read_urbs[i]);
1516
1517 cancel_work_sync(&acm->work);
1518 }
1519
1520 static void acm_disconnect(struct usb_interface *intf)
1521 {
1522 struct acm *acm = usb_get_intfdata(intf);
1523 struct usb_device *usb_dev = interface_to_usbdev(intf);
1524 struct tty_struct *tty;
1525 int i;
1526
1527 dev_dbg(&intf->dev, "%s\n", __func__);
1528
1529 /* sibling interface is already cleaning up */
1530 if (!acm)
1531 return;
1532
1533 mutex_lock(&acm->mutex);
1534 acm->disconnected = true;
1535 if (acm->country_codes) {
1536 device_remove_file(&acm->control->dev,
1537 &dev_attr_wCountryCodes);
1538 device_remove_file(&acm->control->dev,
1539 &dev_attr_iCountryCodeRelDate);
1540 }
1541 wake_up_all(&acm->wioctl);
1542 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1543 usb_set_intfdata(acm->control, NULL);
1544 usb_set_intfdata(acm->data, NULL);
1545 mutex_unlock(&acm->mutex);
1546
1547 tty = tty_port_tty_get(&acm->port);
1548 if (tty) {
1549 tty_vhangup(tty);
1550 tty_kref_put(tty);
1551 }
1552
1553 stop_data_traffic(acm);
1554
1555 tty_unregister_device(acm_tty_driver, acm->minor);
1556
1557 usb_free_urb(acm->ctrlurb);
1558 for (i = 0; i < ACM_NW; i++)
1559 usb_free_urb(acm->wb[i].urb);
1560 for (i = 0; i < acm->rx_buflimit; i++)
1561 usb_free_urb(acm->read_urbs[i]);
1562 acm_write_buffers_free(acm);
1563 usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1564 acm_read_buffers_free(acm);
1565
1566 if (!acm->combined_interfaces)
1567 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1568 acm->data : acm->control);
1569
1570 tty_port_put(&acm->port);
1571 }
1572
1573 #ifdef CONFIG_PM
1574 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1575 {
1576 struct acm *acm = usb_get_intfdata(intf);
1577 int cnt;
1578
1579 spin_lock_irq(&acm->write_lock);
1580 if (PMSG_IS_AUTO(message)) {
1581 if (acm->transmitting) {
1582 spin_unlock_irq(&acm->write_lock);
1583 return -EBUSY;
1584 }
1585 }
1586 cnt = acm->susp_count++;
1587 spin_unlock_irq(&acm->write_lock);
1588
1589 if (cnt)
1590 return 0;
1591
1592 stop_data_traffic(acm);
1593
1594 return 0;
1595 }
1596
1597 static int acm_resume(struct usb_interface *intf)
1598 {
1599 struct acm *acm = usb_get_intfdata(intf);
1600 struct urb *urb;
1601 int rv = 0;
1602
1603 spin_lock_irq(&acm->write_lock);
1604
1605 if (--acm->susp_count)
1606 goto out;
1607
1608 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1609 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1610
1611 for (;;) {
1612 urb = usb_get_from_anchor(&acm->delayed);
1613 if (!urb)
1614 break;
1615
1616 acm_start_wb(acm, urb->context);
1617 }
1618
1619 /*
1620 * delayed error checking because we must
1621 * do the write path at all cost
1622 */
1623 if (rv < 0)
1624 goto out;
1625
1626 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1627 }
1628 out:
1629 spin_unlock_irq(&acm->write_lock);
1630
1631 return rv;
1632 }
1633
1634 static int acm_reset_resume(struct usb_interface *intf)
1635 {
1636 struct acm *acm = usb_get_intfdata(intf);
1637
1638 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1639 tty_port_tty_hangup(&acm->port, false);
1640
1641 return acm_resume(intf);
1642 }
1643
1644 #endif /* CONFIG_PM */
1645
1646 #define NOKIA_PCSUITE_ACM_INFO(x) \
1647 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1648 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1649 USB_CDC_ACM_PROTO_VENDOR)
1650
1651 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1652 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1653 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1654 USB_CDC_ACM_PROTO_VENDOR)
1655
1656 /*
1657 * USB driver structure.
1658 */
1659
1660 static const struct usb_device_id acm_ids[] = {
1661 /* quirky and broken devices */
1662 { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1663 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1664 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1665 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1666 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1667 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1668 },
1669 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1670 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1671 },
1672 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1673 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1674 },
1675 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1676 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1677 },
1678 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1679 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1680 },
1681 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1682 .driver_info = SINGLE_RX_URB,
1683 },
1684 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1685 .driver_info = SINGLE_RX_URB, /* firmware bug */
1686 },
1687 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1688 .driver_info = SINGLE_RX_URB, /* firmware bug */
1689 },
1690 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1691 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1692 },
1693 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1694 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1695 },
1696 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1697 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1698 },
1699 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1700 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1701 },
1702 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1703 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1704 },
1705 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1706 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1707 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1708 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1709 },
1710 /* Motorola H24 HSPA module: */
1711 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1712 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1713 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1714 },
1715 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1716 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1717 },
1718 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1719 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1720 },
1721 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1722 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1723 },
1724 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1725 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1726 },
1727 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1728 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1729 },
1730 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1731 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1732 },
1733
1734 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1735 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1736 data interface instead of
1737 communications interface.
1738 Maybe we should define a new
1739 quirk for this. */
1740 },
1741 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1742 .driver_info = NO_UNION_NORMAL,
1743 },
1744 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1745 .driver_info = NO_UNION_NORMAL,
1746 },
1747 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1748 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1749 },
1750 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1751 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1752 },
1753
1754 /* Nokia S60 phones expose two ACM channels. The first is
1755 * a modem and is picked up by the standard AT-command
1756 * information below. The second is 'vendor-specific' but
1757 * is treated as a serial device at the S60 end, so we want
1758 * to expose it on Linux too. */
1759 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1760 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1761 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1762 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1763 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1764 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1765 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1766 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1767 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1768 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1769 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1770 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1771 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1772 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1773 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1774 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1775 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1776 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1777 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1778 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1779 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1780 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1781 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1782 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1783 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1784 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1785 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1786 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1787 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1788 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1789 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1790 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1791 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1792 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1793 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1794 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1795 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1796 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1797 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1798 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1799 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1800 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1801 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1802 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1803 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1804 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1805 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1806 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1807 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1808 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1809 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1810 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1811 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1812 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1813 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1814 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1815 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1816 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1817
1818 /* Support for Owen devices */
1819 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1820
1821 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1822
1823 /* Support for Droids MuIn LCD */
1824 { USB_DEVICE(0x04d8, 0x000b),
1825 .driver_info = NO_DATA_INTERFACE,
1826 },
1827
1828 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1829 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1830 .driver_info = IGNORE_DEVICE,
1831 },
1832 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1833 .driver_info = IGNORE_DEVICE,
1834 },
1835 #endif
1836
1837 /* control interfaces without any protocol set */
1838 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1839 USB_CDC_PROTO_NONE) },
1840
1841 /* control interfaces with various AT-command sets */
1842 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1843 USB_CDC_ACM_PROTO_AT_V25TER) },
1844 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1845 USB_CDC_ACM_PROTO_AT_PCCA101) },
1846 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1847 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1848 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1849 USB_CDC_ACM_PROTO_AT_GSM) },
1850 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1851 USB_CDC_ACM_PROTO_AT_3G) },
1852 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1853 USB_CDC_ACM_PROTO_AT_CDMA) },
1854
1855 { }
1856 };
1857
1858 MODULE_DEVICE_TABLE(usb, acm_ids);
1859
1860 static struct usb_driver acm_driver = {
1861 .name = "cdc_acm",
1862 .probe = acm_probe,
1863 .disconnect = acm_disconnect,
1864 #ifdef CONFIG_PM
1865 .suspend = acm_suspend,
1866 .resume = acm_resume,
1867 .reset_resume = acm_reset_resume,
1868 #endif
1869 .id_table = acm_ids,
1870 #ifdef CONFIG_PM
1871 .supports_autosuspend = 1,
1872 #endif
1873 .disable_hub_initiated_lpm = 1,
1874 };
1875
1876 /*
1877 * TTY driver structures.
1878 */
1879
1880 static const struct tty_operations acm_ops = {
1881 .install = acm_tty_install,
1882 .open = acm_tty_open,
1883 .close = acm_tty_close,
1884 .cleanup = acm_tty_cleanup,
1885 .hangup = acm_tty_hangup,
1886 .write = acm_tty_write,
1887 .write_room = acm_tty_write_room,
1888 .ioctl = acm_tty_ioctl,
1889 .throttle = acm_tty_throttle,
1890 .unthrottle = acm_tty_unthrottle,
1891 .chars_in_buffer = acm_tty_chars_in_buffer,
1892 .break_ctl = acm_tty_break_ctl,
1893 .set_termios = acm_tty_set_termios,
1894 .tiocmget = acm_tty_tiocmget,
1895 .tiocmset = acm_tty_tiocmset,
1896 };
1897
1898 /*
1899 * Init / exit.
1900 */
1901
1902 static int __init acm_init(void)
1903 {
1904 int retval;
1905 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1906 if (!acm_tty_driver)
1907 return -ENOMEM;
1908 acm_tty_driver->driver_name = "acm",
1909 acm_tty_driver->name = "ttyACM",
1910 acm_tty_driver->major = ACM_TTY_MAJOR,
1911 acm_tty_driver->minor_start = 0,
1912 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1913 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1914 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1915 acm_tty_driver->init_termios = tty_std_termios;
1916 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1917 HUPCL | CLOCAL;
1918 tty_set_operations(acm_tty_driver, &acm_ops);
1919
1920 retval = tty_register_driver(acm_tty_driver);
1921 if (retval) {
1922 put_tty_driver(acm_tty_driver);
1923 return retval;
1924 }
1925
1926 retval = usb_register(&acm_driver);
1927 if (retval) {
1928 tty_unregister_driver(acm_tty_driver);
1929 put_tty_driver(acm_tty_driver);
1930 return retval;
1931 }
1932
1933 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1934
1935 return 0;
1936 }
1937
1938 static void __exit acm_exit(void)
1939 {
1940 usb_deregister(&acm_driver);
1941 tty_unregister_driver(acm_tty_driver);
1942 put_tty_driver(acm_tty_driver);
1943 }
1944
1945 module_init(acm_init);
1946 module_exit(acm_exit);
1947
1948 MODULE_AUTHOR(DRIVER_AUTHOR);
1949 MODULE_DESCRIPTION(DRIVER_DESC);
1950 MODULE_LICENSE("GPL");
1951 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
Linux kernel - Deliverables
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