]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/usb/class/cdc-acm.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:


43cb05863facd7cdc00705b2a3c8ddaf5794389d
[mirror_ubuntu-bionic-kernel.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 (urb->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
466 if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
467 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
468 __func__,
469 urb->actual_length,
470 urb->transfer_buffer_length,
471 urb->status);
472
473 spin_lock_irqsave(&acm->write_lock, flags);
474 acm_write_done(acm, wb);
475 spin_unlock_irqrestore(&acm->write_lock, flags);
476 schedule_work(&acm->work);
477 }
478
479 static void acm_softint(struct work_struct *work)
480 {
481 struct acm *acm = container_of(work, struct acm, work);
482
483 dev_vdbg(&acm->data->dev, "%s\n", __func__);
484
485 tty_port_tty_wakeup(&acm->port);
486 }
487
488 /*
489 * TTY handlers
490 */
491
492 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
493 {
494 struct acm *acm;
495 int retval;
496
497 dev_dbg(tty->dev, "%s\n", __func__);
498
499 acm = acm_get_by_index(tty->index);
500 if (!acm)
501 return -ENODEV;
502
503 retval = tty_standard_install(driver, tty);
504 if (retval)
505 goto error_init_termios;
506
507 tty->driver_data = acm;
508
509 return 0;
510
511 error_init_termios:
512 tty_port_put(&acm->port);
513 return retval;
514 }
515
516 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
517 {
518 struct acm *acm = tty->driver_data;
519
520 dev_dbg(tty->dev, "%s\n", __func__);
521
522 return tty_port_open(&acm->port, tty, filp);
523 }
524
525 static void acm_port_dtr_rts(struct tty_port *port, int raise)
526 {
527 struct acm *acm = container_of(port, struct acm, port);
528 int val;
529 int res;
530
531 if (raise)
532 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
533 else
534 val = 0;
535
536 /* FIXME: add missing ctrlout locking throughout driver */
537 acm->ctrlout = val;
538
539 res = acm_set_control(acm, val);
540 if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
541 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
542 }
543
544 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
545 {
546 struct acm *acm = container_of(port, struct acm, port);
547 int retval = -ENODEV;
548 int i;
549
550 dev_dbg(&acm->control->dev, "%s\n", __func__);
551
552 mutex_lock(&acm->mutex);
553 if (acm->disconnected)
554 goto disconnected;
555
556 retval = usb_autopm_get_interface(acm->control);
557 if (retval)
558 goto error_get_interface;
559
560 /*
561 * FIXME: Why do we need this? Allocating 64K of physically contiguous
562 * memory is really nasty...
563 */
564 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
565 acm->control->needs_remote_wakeup = 1;
566
567 acm->ctrlurb->dev = acm->dev;
568 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
569 if (retval) {
570 dev_err(&acm->control->dev,
571 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
572 goto error_submit_urb;
573 }
574
575 acm_tty_set_termios(tty, NULL);
576
577 /*
578 * Unthrottle device in case the TTY was closed while throttled.
579 */
580 spin_lock_irq(&acm->read_lock);
581 acm->throttled = 0;
582 acm->throttle_req = 0;
583 spin_unlock_irq(&acm->read_lock);
584
585 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
586 if (retval)
587 goto error_submit_read_urbs;
588
589 usb_autopm_put_interface(acm->control);
590
591 mutex_unlock(&acm->mutex);
592
593 return 0;
594
595 error_submit_read_urbs:
596 for (i = 0; i < acm->rx_buflimit; i++)
597 usb_kill_urb(acm->read_urbs[i]);
598 usb_kill_urb(acm->ctrlurb);
599 error_submit_urb:
600 usb_autopm_put_interface(acm->control);
601 error_get_interface:
602 disconnected:
603 mutex_unlock(&acm->mutex);
604
605 return usb_translate_errors(retval);
606 }
607
608 static void acm_port_destruct(struct tty_port *port)
609 {
610 struct acm *acm = container_of(port, struct acm, port);
611
612 dev_dbg(&acm->control->dev, "%s\n", __func__);
613
614 acm_release_minor(acm);
615 usb_put_intf(acm->control);
616 kfree(acm->country_codes);
617 kfree(acm);
618 }
619
620 static void acm_port_shutdown(struct tty_port *port)
621 {
622 struct acm *acm = container_of(port, struct acm, port);
623 struct urb *urb;
624 struct acm_wb *wb;
625 int i;
626
627 dev_dbg(&acm->control->dev, "%s\n", __func__);
628
629 /*
630 * Need to grab write_lock to prevent race with resume, but no need to
631 * hold it due to the tty-port initialised flag.
632 */
633 spin_lock_irq(&acm->write_lock);
634 spin_unlock_irq(&acm->write_lock);
635
636 usb_autopm_get_interface_no_resume(acm->control);
637 acm->control->needs_remote_wakeup = 0;
638 usb_autopm_put_interface(acm->control);
639
640 for (;;) {
641 urb = usb_get_from_anchor(&acm->delayed);
642 if (!urb)
643 break;
644 wb = urb->context;
645 wb->use = 0;
646 usb_autopm_put_interface_async(acm->control);
647 }
648
649 usb_kill_urb(acm->ctrlurb);
650 for (i = 0; i < ACM_NW; i++)
651 usb_kill_urb(acm->wb[i].urb);
652 for (i = 0; i < acm->rx_buflimit; i++)
653 usb_kill_urb(acm->read_urbs[i]);
654 }
655
656 static void acm_tty_cleanup(struct tty_struct *tty)
657 {
658 struct acm *acm = tty->driver_data;
659 dev_dbg(&acm->control->dev, "%s\n", __func__);
660 tty_port_put(&acm->port);
661 }
662
663 static void acm_tty_hangup(struct tty_struct *tty)
664 {
665 struct acm *acm = tty->driver_data;
666 dev_dbg(&acm->control->dev, "%s\n", __func__);
667 tty_port_hangup(&acm->port);
668 }
669
670 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
671 {
672 struct acm *acm = tty->driver_data;
673 dev_dbg(&acm->control->dev, "%s\n", __func__);
674 tty_port_close(&acm->port, tty, filp);
675 }
676
677 static int acm_tty_write(struct tty_struct *tty,
678 const unsigned char *buf, int count)
679 {
680 struct acm *acm = tty->driver_data;
681 int stat;
682 unsigned long flags;
683 int wbn;
684 struct acm_wb *wb;
685
686 if (!count)
687 return 0;
688
689 dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
690
691 spin_lock_irqsave(&acm->write_lock, flags);
692 wbn = acm_wb_alloc(acm);
693 if (wbn < 0) {
694 spin_unlock_irqrestore(&acm->write_lock, flags);
695 return 0;
696 }
697 wb = &acm->wb[wbn];
698
699 if (!acm->dev) {
700 wb->use = 0;
701 spin_unlock_irqrestore(&acm->write_lock, flags);
702 return -ENODEV;
703 }
704
705 count = (count > acm->writesize) ? acm->writesize : count;
706 dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
707 memcpy(wb->buf, buf, count);
708 wb->len = count;
709
710 stat = usb_autopm_get_interface_async(acm->control);
711 if (stat) {
712 wb->use = 0;
713 spin_unlock_irqrestore(&acm->write_lock, flags);
714 return stat;
715 }
716
717 if (acm->susp_count) {
718 usb_anchor_urb(wb->urb, &acm->delayed);
719 spin_unlock_irqrestore(&acm->write_lock, flags);
720 return count;
721 }
722
723 stat = acm_start_wb(acm, wb);
724 spin_unlock_irqrestore(&acm->write_lock, flags);
725
726 if (stat < 0)
727 return stat;
728 return count;
729 }
730
731 static int acm_tty_write_room(struct tty_struct *tty)
732 {
733 struct acm *acm = tty->driver_data;
734 /*
735 * Do not let the line discipline to know that we have a reserve,
736 * or it might get too enthusiastic.
737 */
738 return acm_wb_is_avail(acm) ? acm->writesize : 0;
739 }
740
741 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
742 {
743 struct acm *acm = tty->driver_data;
744 /*
745 * if the device was unplugged then any remaining characters fell out
746 * of the connector ;)
747 */
748 if (acm->disconnected)
749 return 0;
750 /*
751 * This is inaccurate (overcounts), but it works.
752 */
753 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
754 }
755
756 static void acm_tty_throttle(struct tty_struct *tty)
757 {
758 struct acm *acm = tty->driver_data;
759
760 spin_lock_irq(&acm->read_lock);
761 acm->throttle_req = 1;
762 spin_unlock_irq(&acm->read_lock);
763 }
764
765 static void acm_tty_unthrottle(struct tty_struct *tty)
766 {
767 struct acm *acm = tty->driver_data;
768 unsigned int was_throttled;
769
770 spin_lock_irq(&acm->read_lock);
771 was_throttled = acm->throttled;
772 acm->throttled = 0;
773 acm->throttle_req = 0;
774 spin_unlock_irq(&acm->read_lock);
775
776 if (was_throttled)
777 acm_submit_read_urbs(acm, GFP_KERNEL);
778 }
779
780 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
781 {
782 struct acm *acm = tty->driver_data;
783 int retval;
784
785 retval = acm_send_break(acm, state ? 0xffff : 0);
786 if (retval < 0)
787 dev_dbg(&acm->control->dev, "%s - send break failed\n",
788 __func__);
789 return retval;
790 }
791
792 static int acm_tty_tiocmget(struct tty_struct *tty)
793 {
794 struct acm *acm = tty->driver_data;
795
796 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
797 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
798 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
799 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
800 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
801 TIOCM_CTS;
802 }
803
804 static int acm_tty_tiocmset(struct tty_struct *tty,
805 unsigned int set, unsigned int clear)
806 {
807 struct acm *acm = tty->driver_data;
808 unsigned int newctrl;
809
810 newctrl = acm->ctrlout;
811 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
812 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
813 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
814 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
815
816 newctrl = (newctrl & ~clear) | set;
817
818 if (acm->ctrlout == newctrl)
819 return 0;
820 return acm_set_control(acm, acm->ctrlout = newctrl);
821 }
822
823 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
824 {
825 struct serial_struct tmp;
826
827 if (!info)
828 return -EINVAL;
829
830 memset(&tmp, 0, sizeof(tmp));
831 tmp.flags = ASYNC_LOW_LATENCY;
832 tmp.xmit_fifo_size = acm->writesize;
833 tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
834 tmp.close_delay = acm->port.close_delay / 10;
835 tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
836 ASYNC_CLOSING_WAIT_NONE :
837 acm->port.closing_wait / 10;
838
839 if (copy_to_user(info, &tmp, sizeof(tmp)))
840 return -EFAULT;
841 else
842 return 0;
843 }
844
845 static int set_serial_info(struct acm *acm,
846 struct serial_struct __user *newinfo)
847 {
848 struct serial_struct new_serial;
849 unsigned int closing_wait, close_delay;
850 int retval = 0;
851
852 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
853 return -EFAULT;
854
855 close_delay = new_serial.close_delay * 10;
856 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
857 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
858
859 mutex_lock(&acm->port.mutex);
860
861 if (!capable(CAP_SYS_ADMIN)) {
862 if ((close_delay != acm->port.close_delay) ||
863 (closing_wait != acm->port.closing_wait))
864 retval = -EPERM;
865 else
866 retval = -EOPNOTSUPP;
867 } else {
868 acm->port.close_delay = close_delay;
869 acm->port.closing_wait = closing_wait;
870 }
871
872 mutex_unlock(&acm->port.mutex);
873 return retval;
874 }
875
876 static int wait_serial_change(struct acm *acm, unsigned long arg)
877 {
878 int rv = 0;
879 DECLARE_WAITQUEUE(wait, current);
880 struct async_icount old, new;
881
882 if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
883 return -EINVAL;
884 do {
885 spin_lock_irq(&acm->read_lock);
886 old = acm->oldcount;
887 new = acm->iocount;
888 acm->oldcount = new;
889 spin_unlock_irq(&acm->read_lock);
890
891 if ((arg & TIOCM_DSR) &&
892 old.dsr != new.dsr)
893 break;
894 if ((arg & TIOCM_CD) &&
895 old.dcd != new.dcd)
896 break;
897 if ((arg & TIOCM_RI) &&
898 old.rng != new.rng)
899 break;
900
901 add_wait_queue(&acm->wioctl, &wait);
902 set_current_state(TASK_INTERRUPTIBLE);
903 schedule();
904 remove_wait_queue(&acm->wioctl, &wait);
905 if (acm->disconnected) {
906 if (arg & TIOCM_CD)
907 break;
908 else
909 rv = -ENODEV;
910 } else {
911 if (signal_pending(current))
912 rv = -ERESTARTSYS;
913 }
914 } while (!rv);
915
916
917
918 return rv;
919 }
920
921 static int get_serial_usage(struct acm *acm,
922 struct serial_icounter_struct __user *count)
923 {
924 struct serial_icounter_struct icount;
925 int rv = 0;
926
927 memset(&icount, 0, sizeof(icount));
928 icount.dsr = acm->iocount.dsr;
929 icount.rng = acm->iocount.rng;
930 icount.dcd = acm->iocount.dcd;
931 icount.frame = acm->iocount.frame;
932 icount.overrun = acm->iocount.overrun;
933 icount.parity = acm->iocount.parity;
934 icount.brk = acm->iocount.brk;
935
936 if (copy_to_user(count, &icount, sizeof(icount)) > 0)
937 rv = -EFAULT;
938
939 return rv;
940 }
941
942 static int acm_tty_ioctl(struct tty_struct *tty,
943 unsigned int cmd, unsigned long arg)
944 {
945 struct acm *acm = tty->driver_data;
946 int rv = -ENOIOCTLCMD;
947
948 switch (cmd) {
949 case TIOCGSERIAL: /* gets serial port data */
950 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
951 break;
952 case TIOCSSERIAL:
953 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
954 break;
955 case TIOCMIWAIT:
956 rv = usb_autopm_get_interface(acm->control);
957 if (rv < 0) {
958 rv = -EIO;
959 break;
960 }
961 rv = wait_serial_change(acm, arg);
962 usb_autopm_put_interface(acm->control);
963 break;
964 case TIOCGICOUNT:
965 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
966 break;
967 }
968
969 return rv;
970 }
971
972 static void acm_tty_set_termios(struct tty_struct *tty,
973 struct ktermios *termios_old)
974 {
975 struct acm *acm = tty->driver_data;
976 struct ktermios *termios = &tty->termios;
977 struct usb_cdc_line_coding newline;
978 int newctrl = acm->ctrlout;
979
980 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
981 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
982 newline.bParityType = termios->c_cflag & PARENB ?
983 (termios->c_cflag & PARODD ? 1 : 2) +
984 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
985 switch (termios->c_cflag & CSIZE) {
986 case CS5:
987 newline.bDataBits = 5;
988 break;
989 case CS6:
990 newline.bDataBits = 6;
991 break;
992 case CS7:
993 newline.bDataBits = 7;
994 break;
995 case CS8:
996 default:
997 newline.bDataBits = 8;
998 break;
999 }
1000 /* FIXME: Needs to clear unsupported bits in the termios */
1001 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1002
1003 if (C_BAUD(tty) == B0) {
1004 newline.dwDTERate = acm->line.dwDTERate;
1005 newctrl &= ~ACM_CTRL_DTR;
1006 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1007 newctrl |= ACM_CTRL_DTR;
1008 }
1009
1010 if (newctrl != acm->ctrlout)
1011 acm_set_control(acm, acm->ctrlout = newctrl);
1012
1013 if (memcmp(&acm->line, &newline, sizeof newline)) {
1014 memcpy(&acm->line, &newline, sizeof newline);
1015 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1016 __func__,
1017 le32_to_cpu(newline.dwDTERate),
1018 newline.bCharFormat, newline.bParityType,
1019 newline.bDataBits);
1020 acm_set_line(acm, &acm->line);
1021 }
1022 }
1023
1024 static const struct tty_port_operations acm_port_ops = {
1025 .dtr_rts = acm_port_dtr_rts,
1026 .shutdown = acm_port_shutdown,
1027 .activate = acm_port_activate,
1028 .destruct = acm_port_destruct,
1029 };
1030
1031 /*
1032 * USB probe and disconnect routines.
1033 */
1034
1035 /* Little helpers: write/read buffers free */
1036 static void acm_write_buffers_free(struct acm *acm)
1037 {
1038 int i;
1039 struct acm_wb *wb;
1040 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1041
1042 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1043 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1044 }
1045
1046 static void acm_read_buffers_free(struct acm *acm)
1047 {
1048 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1049 int i;
1050
1051 for (i = 0; i < acm->rx_buflimit; i++)
1052 usb_free_coherent(usb_dev, acm->readsize,
1053 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1054 }
1055
1056 /* Little helper: write buffers allocate */
1057 static int acm_write_buffers_alloc(struct acm *acm)
1058 {
1059 int i;
1060 struct acm_wb *wb;
1061
1062 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1063 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1064 &wb->dmah);
1065 if (!wb->buf) {
1066 while (i != 0) {
1067 --i;
1068 --wb;
1069 usb_free_coherent(acm->dev, acm->writesize,
1070 wb->buf, wb->dmah);
1071 }
1072 return -ENOMEM;
1073 }
1074 }
1075 return 0;
1076 }
1077
1078 static int acm_probe(struct usb_interface *intf,
1079 const struct usb_device_id *id)
1080 {
1081 struct usb_cdc_union_desc *union_header = NULL;
1082 struct usb_cdc_country_functional_desc *cfd = NULL;
1083 unsigned char *buffer = intf->altsetting->extra;
1084 int buflen = intf->altsetting->extralen;
1085 struct usb_interface *control_interface;
1086 struct usb_interface *data_interface;
1087 struct usb_endpoint_descriptor *epctrl = NULL;
1088 struct usb_endpoint_descriptor *epread = NULL;
1089 struct usb_endpoint_descriptor *epwrite = NULL;
1090 struct usb_device *usb_dev = interface_to_usbdev(intf);
1091 struct acm *acm;
1092 int minor;
1093 int ctrlsize, readsize;
1094 u8 *buf;
1095 u8 ac_management_function = 0;
1096 u8 call_management_function = 0;
1097 int call_interface_num = -1;
1098 int data_interface_num = -1;
1099 unsigned long quirks;
1100 int num_rx_buf;
1101 int i;
1102 unsigned int elength = 0;
1103 int combined_interfaces = 0;
1104 struct device *tty_dev;
1105 int rv = -ENOMEM;
1106
1107 /* normal quirks */
1108 quirks = (unsigned long)id->driver_info;
1109
1110 if (quirks == IGNORE_DEVICE)
1111 return -ENODEV;
1112
1113 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1114
1115 /* handle quirks deadly to normal probing*/
1116 if (quirks == NO_UNION_NORMAL) {
1117 data_interface = usb_ifnum_to_if(usb_dev, 1);
1118 control_interface = usb_ifnum_to_if(usb_dev, 0);
1119 goto skip_normal_probe;
1120 }
1121
1122 /* normal probing*/
1123 if (!buffer) {
1124 dev_err(&intf->dev, "Weird descriptor references\n");
1125 return -EINVAL;
1126 }
1127
1128 if (!buflen) {
1129 if (intf->cur_altsetting->endpoint &&
1130 intf->cur_altsetting->endpoint->extralen &&
1131 intf->cur_altsetting->endpoint->extra) {
1132 dev_dbg(&intf->dev,
1133 "Seeking extra descriptors on endpoint\n");
1134 buflen = intf->cur_altsetting->endpoint->extralen;
1135 buffer = intf->cur_altsetting->endpoint->extra;
1136 } else {
1137 dev_err(&intf->dev,
1138 "Zero length descriptor references\n");
1139 return -EINVAL;
1140 }
1141 }
1142
1143 while (buflen > 0) {
1144 if (buffer[1] != USB_DT_CS_INTERFACE) {
1145 dev_err(&intf->dev, "skipping garbage\n");
1146 goto next_desc;
1147 }
1148 elength = buffer[0];
1149
1150 switch (buffer[2]) {
1151 case USB_CDC_UNION_TYPE: /* we've found it */
1152 if (elength < sizeof(struct usb_cdc_union_desc))
1153 goto next_desc;
1154 if (union_header) {
1155 dev_err(&intf->dev, "More than one "
1156 "union descriptor, skipping ...\n");
1157 goto next_desc;
1158 }
1159 union_header = (struct usb_cdc_union_desc *)buffer;
1160 break;
1161 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1162 if (elength < sizeof(struct usb_cdc_country_functional_desc))
1163 goto next_desc;
1164 cfd = (struct usb_cdc_country_functional_desc *)buffer;
1165 break;
1166 case USB_CDC_HEADER_TYPE: /* maybe check version */
1167 break; /* for now we ignore it */
1168 case USB_CDC_ACM_TYPE:
1169 if (elength < 4)
1170 goto next_desc;
1171 ac_management_function = buffer[3];
1172 break;
1173 case USB_CDC_CALL_MANAGEMENT_TYPE:
1174 if (elength < 5)
1175 goto next_desc;
1176 call_management_function = buffer[3];
1177 call_interface_num = buffer[4];
1178 break;
1179 default:
1180 /*
1181 * there are LOTS more CDC descriptors that
1182 * could legitimately be found here.
1183 */
1184 dev_dbg(&intf->dev, "Ignoring descriptor: "
1185 "type %02x, length %ud\n",
1186 buffer[2], elength);
1187 break;
1188 }
1189 next_desc:
1190 buflen -= elength;
1191 buffer += elength;
1192 }
1193
1194 if (!union_header) {
1195 if (call_interface_num > 0) {
1196 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1197 /* quirks for Droids MuIn LCD */
1198 if (quirks & NO_DATA_INTERFACE)
1199 data_interface = usb_ifnum_to_if(usb_dev, 0);
1200 else
1201 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1202 control_interface = intf;
1203 } else {
1204 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1205 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1206 return -ENODEV;
1207 } else {
1208 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1209 combined_interfaces = 1;
1210 control_interface = data_interface = intf;
1211 goto look_for_collapsed_interface;
1212 }
1213 }
1214 } else {
1215 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1216 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1217 }
1218
1219 if (!control_interface || !data_interface) {
1220 dev_dbg(&intf->dev, "no interfaces\n");
1221 return -ENODEV;
1222 }
1223
1224 if (data_interface_num != call_interface_num)
1225 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1226
1227 if (control_interface == data_interface) {
1228 /* some broken devices designed for windows work this way */
1229 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1230 combined_interfaces = 1;
1231 /* a popular other OS doesn't use it */
1232 quirks |= NO_CAP_LINE;
1233 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1234 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1235 return -EINVAL;
1236 }
1237 look_for_collapsed_interface:
1238 for (i = 0; i < 3; i++) {
1239 struct usb_endpoint_descriptor *ep;
1240 ep = &data_interface->cur_altsetting->endpoint[i].desc;
1241
1242 if (usb_endpoint_is_int_in(ep))
1243 epctrl = ep;
1244 else if (usb_endpoint_is_bulk_out(ep))
1245 epwrite = ep;
1246 else if (usb_endpoint_is_bulk_in(ep))
1247 epread = ep;
1248 else
1249 return -EINVAL;
1250 }
1251 if (!epctrl || !epread || !epwrite)
1252 return -ENODEV;
1253 else
1254 goto made_compressed_probe;
1255 }
1256
1257 skip_normal_probe:
1258
1259 /*workaround for switched interfaces */
1260 if (data_interface->cur_altsetting->desc.bInterfaceClass
1261 != CDC_DATA_INTERFACE_TYPE) {
1262 if (control_interface->cur_altsetting->desc.bInterfaceClass
1263 == CDC_DATA_INTERFACE_TYPE) {
1264 struct usb_interface *t;
1265 dev_dbg(&intf->dev,
1266 "Your device has switched interfaces.\n");
1267 t = control_interface;
1268 control_interface = data_interface;
1269 data_interface = t;
1270 } else {
1271 return -EINVAL;
1272 }
1273 }
1274
1275 /* Accept probe requests only for the control interface */
1276 if (!combined_interfaces && intf != control_interface)
1277 return -ENODEV;
1278
1279 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1280 /* valid in this context */
1281 dev_dbg(&intf->dev, "The data interface isn't available\n");
1282 return -EBUSY;
1283 }
1284
1285
1286 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1287 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1288 return -EINVAL;
1289
1290 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1291 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1292 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1293
1294
1295 /* workaround for switched endpoints */
1296 if (!usb_endpoint_dir_in(epread)) {
1297 /* descriptors are swapped */
1298 struct usb_endpoint_descriptor *t;
1299 dev_dbg(&intf->dev,
1300 "The data interface has switched endpoints\n");
1301 t = epread;
1302 epread = epwrite;
1303 epwrite = t;
1304 }
1305 made_compressed_probe:
1306 dev_dbg(&intf->dev, "interfaces are valid\n");
1307
1308 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1309 if (acm == NULL)
1310 goto alloc_fail;
1311
1312 minor = acm_alloc_minor(acm);
1313 if (minor == ACM_TTY_MINORS) {
1314 dev_err(&intf->dev, "no more free acm devices\n");
1315 kfree(acm);
1316 return -ENODEV;
1317 }
1318
1319 ctrlsize = usb_endpoint_maxp(epctrl);
1320 readsize = usb_endpoint_maxp(epread) *
1321 (quirks == SINGLE_RX_URB ? 1 : 2);
1322 acm->combined_interfaces = combined_interfaces;
1323 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1324 acm->control = control_interface;
1325 acm->data = data_interface;
1326 acm->minor = minor;
1327 acm->dev = usb_dev;
1328 acm->ctrl_caps = ac_management_function;
1329 if (quirks & NO_CAP_LINE)
1330 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1331 acm->ctrlsize = ctrlsize;
1332 acm->readsize = readsize;
1333 acm->rx_buflimit = num_rx_buf;
1334 INIT_WORK(&acm->work, acm_softint);
1335 init_waitqueue_head(&acm->wioctl);
1336 spin_lock_init(&acm->write_lock);
1337 spin_lock_init(&acm->read_lock);
1338 mutex_init(&acm->mutex);
1339 acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1340 acm->is_int_ep = usb_endpoint_xfer_int(epread);
1341 if (acm->is_int_ep)
1342 acm->bInterval = epread->bInterval;
1343 tty_port_init(&acm->port);
1344 acm->port.ops = &acm_port_ops;
1345 init_usb_anchor(&acm->delayed);
1346 acm->quirks = quirks;
1347
1348 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1349 if (!buf)
1350 goto alloc_fail2;
1351 acm->ctrl_buffer = buf;
1352
1353 if (acm_write_buffers_alloc(acm) < 0)
1354 goto alloc_fail4;
1355
1356 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1357 if (!acm->ctrlurb)
1358 goto alloc_fail5;
1359
1360 for (i = 0; i < num_rx_buf; i++) {
1361 struct acm_rb *rb = &(acm->read_buffers[i]);
1362 struct urb *urb;
1363
1364 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1365 &rb->dma);
1366 if (!rb->base)
1367 goto alloc_fail6;
1368 rb->index = i;
1369 rb->instance = acm;
1370
1371 urb = usb_alloc_urb(0, GFP_KERNEL);
1372 if (!urb)
1373 goto alloc_fail6;
1374
1375 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1376 urb->transfer_dma = rb->dma;
1377 if (acm->is_int_ep) {
1378 usb_fill_int_urb(urb, acm->dev,
1379 acm->rx_endpoint,
1380 rb->base,
1381 acm->readsize,
1382 acm_read_bulk_callback, rb,
1383 acm->bInterval);
1384 } else {
1385 usb_fill_bulk_urb(urb, acm->dev,
1386 acm->rx_endpoint,
1387 rb->base,
1388 acm->readsize,
1389 acm_read_bulk_callback, rb);
1390 }
1391
1392 acm->read_urbs[i] = urb;
1393 __set_bit(i, &acm->read_urbs_free);
1394 }
1395 for (i = 0; i < ACM_NW; i++) {
1396 struct acm_wb *snd = &(acm->wb[i]);
1397
1398 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1399 if (snd->urb == NULL)
1400 goto alloc_fail7;
1401
1402 if (usb_endpoint_xfer_int(epwrite))
1403 usb_fill_int_urb(snd->urb, usb_dev,
1404 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1405 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1406 else
1407 usb_fill_bulk_urb(snd->urb, usb_dev,
1408 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1409 NULL, acm->writesize, acm_write_bulk, snd);
1410 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1411 snd->instance = acm;
1412 }
1413
1414 usb_set_intfdata(intf, acm);
1415
1416 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1417 if (i < 0)
1418 goto alloc_fail7;
1419
1420 if (cfd) { /* export the country data */
1421 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1422 if (!acm->country_codes)
1423 goto skip_countries;
1424 acm->country_code_size = cfd->bLength - 4;
1425 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1426 cfd->bLength - 4);
1427 acm->country_rel_date = cfd->iCountryCodeRelDate;
1428
1429 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1430 if (i < 0) {
1431 kfree(acm->country_codes);
1432 acm->country_codes = NULL;
1433 acm->country_code_size = 0;
1434 goto skip_countries;
1435 }
1436
1437 i = device_create_file(&intf->dev,
1438 &dev_attr_iCountryCodeRelDate);
1439 if (i < 0) {
1440 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1441 kfree(acm->country_codes);
1442 acm->country_codes = NULL;
1443 acm->country_code_size = 0;
1444 goto skip_countries;
1445 }
1446 }
1447
1448 skip_countries:
1449 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1450 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1451 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1452 /* works around buggy devices */
1453 epctrl->bInterval ? epctrl->bInterval : 16);
1454 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1455 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1456
1457 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1458
1459 acm->line.dwDTERate = cpu_to_le32(9600);
1460 acm->line.bDataBits = 8;
1461 acm_set_line(acm, &acm->line);
1462
1463 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1464 usb_set_intfdata(data_interface, acm);
1465
1466 usb_get_intf(control_interface);
1467 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1468 &control_interface->dev);
1469 if (IS_ERR(tty_dev)) {
1470 rv = PTR_ERR(tty_dev);
1471 goto alloc_fail8;
1472 }
1473
1474 return 0;
1475 alloc_fail8:
1476 if (acm->country_codes) {
1477 device_remove_file(&acm->control->dev,
1478 &dev_attr_wCountryCodes);
1479 device_remove_file(&acm->control->dev,
1480 &dev_attr_iCountryCodeRelDate);
1481 kfree(acm->country_codes);
1482 }
1483 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1484 alloc_fail7:
1485 usb_set_intfdata(intf, NULL);
1486 for (i = 0; i < ACM_NW; i++)
1487 usb_free_urb(acm->wb[i].urb);
1488 alloc_fail6:
1489 for (i = 0; i < num_rx_buf; i++)
1490 usb_free_urb(acm->read_urbs[i]);
1491 acm_read_buffers_free(acm);
1492 usb_free_urb(acm->ctrlurb);
1493 alloc_fail5:
1494 acm_write_buffers_free(acm);
1495 alloc_fail4:
1496 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1497 alloc_fail2:
1498 acm_release_minor(acm);
1499 kfree(acm);
1500 alloc_fail:
1501 return rv;
1502 }
1503
1504 static void stop_data_traffic(struct acm *acm)
1505 {
1506 int i;
1507
1508 dev_dbg(&acm->control->dev, "%s\n", __func__);
1509
1510 usb_kill_urb(acm->ctrlurb);
1511 for (i = 0; i < ACM_NW; i++)
1512 usb_kill_urb(acm->wb[i].urb);
1513 for (i = 0; i < acm->rx_buflimit; i++)
1514 usb_kill_urb(acm->read_urbs[i]);
1515
1516 cancel_work_sync(&acm->work);
1517 }
1518
1519 static void acm_disconnect(struct usb_interface *intf)
1520 {
1521 struct acm *acm = usb_get_intfdata(intf);
1522 struct usb_device *usb_dev = interface_to_usbdev(intf);
1523 struct tty_struct *tty;
1524 int i;
1525
1526 dev_dbg(&intf->dev, "%s\n", __func__);
1527
1528 /* sibling interface is already cleaning up */
1529 if (!acm)
1530 return;
1531
1532 mutex_lock(&acm->mutex);
1533 acm->disconnected = true;
1534 if (acm->country_codes) {
1535 device_remove_file(&acm->control->dev,
1536 &dev_attr_wCountryCodes);
1537 device_remove_file(&acm->control->dev,
1538 &dev_attr_iCountryCodeRelDate);
1539 }
1540 wake_up_all(&acm->wioctl);
1541 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1542 usb_set_intfdata(acm->control, NULL);
1543 usb_set_intfdata(acm->data, NULL);
1544 mutex_unlock(&acm->mutex);
1545
1546 tty = tty_port_tty_get(&acm->port);
1547 if (tty) {
1548 tty_vhangup(tty);
1549 tty_kref_put(tty);
1550 }
1551
1552 stop_data_traffic(acm);
1553
1554 tty_unregister_device(acm_tty_driver, acm->minor);
1555
1556 usb_free_urb(acm->ctrlurb);
1557 for (i = 0; i < ACM_NW; i++)
1558 usb_free_urb(acm->wb[i].urb);
1559 for (i = 0; i < acm->rx_buflimit; i++)
1560 usb_free_urb(acm->read_urbs[i]);
1561 acm_write_buffers_free(acm);
1562 usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1563 acm_read_buffers_free(acm);
1564
1565 if (!acm->combined_interfaces)
1566 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1567 acm->data : acm->control);
1568
1569 tty_port_put(&acm->port);
1570 }
1571
1572 #ifdef CONFIG_PM
1573 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1574 {
1575 struct acm *acm = usb_get_intfdata(intf);
1576 int cnt;
1577
1578 spin_lock_irq(&acm->write_lock);
1579 if (PMSG_IS_AUTO(message)) {
1580 if (acm->transmitting) {
1581 spin_unlock_irq(&acm->write_lock);
1582 return -EBUSY;
1583 }
1584 }
1585 cnt = acm->susp_count++;
1586 spin_unlock_irq(&acm->write_lock);
1587
1588 if (cnt)
1589 return 0;
1590
1591 stop_data_traffic(acm);
1592
1593 return 0;
1594 }
1595
1596 static int acm_resume(struct usb_interface *intf)
1597 {
1598 struct acm *acm = usb_get_intfdata(intf);
1599 struct urb *urb;
1600 int rv = 0;
1601
1602 spin_lock_irq(&acm->write_lock);
1603
1604 if (--acm->susp_count)
1605 goto out;
1606
1607 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1608 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1609
1610 for (;;) {
1611 urb = usb_get_from_anchor(&acm->delayed);
1612 if (!urb)
1613 break;
1614
1615 acm_start_wb(acm, urb->context);
1616 }
1617
1618 /*
1619 * delayed error checking because we must
1620 * do the write path at all cost
1621 */
1622 if (rv < 0)
1623 goto out;
1624
1625 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1626 }
1627 out:
1628 spin_unlock_irq(&acm->write_lock);
1629
1630 return rv;
1631 }
1632
1633 static int acm_reset_resume(struct usb_interface *intf)
1634 {
1635 struct acm *acm = usb_get_intfdata(intf);
1636
1637 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1638 tty_port_tty_hangup(&acm->port, false);
1639
1640 return acm_resume(intf);
1641 }
1642
1643 #endif /* CONFIG_PM */
1644
1645 #define NOKIA_PCSUITE_ACM_INFO(x) \
1646 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1647 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1648 USB_CDC_ACM_PROTO_VENDOR)
1649
1650 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1651 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1652 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1653 USB_CDC_ACM_PROTO_VENDOR)
1654
1655 /*
1656 * USB driver structure.
1657 */
1658
1659 static const struct usb_device_id acm_ids[] = {
1660 /* quirky and broken devices */
1661 { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1662 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1663 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1664 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1665 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1666 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1667 },
1668 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1669 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1670 },
1671 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1672 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1673 },
1674 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1675 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1676 },
1677 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1678 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1679 },
1680 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1681 .driver_info = SINGLE_RX_URB,
1682 },
1683 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1684 .driver_info = SINGLE_RX_URB, /* firmware bug */
1685 },
1686 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1687 .driver_info = SINGLE_RX_URB, /* firmware bug */
1688 },
1689 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1690 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1691 },
1692 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1693 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1694 },
1695 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1696 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1697 },
1698 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1699 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1700 },
1701 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1702 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1703 },
1704 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1705 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1706 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1707 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1708 },
1709 /* Motorola H24 HSPA module: */
1710 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1711 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1712 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1713 },
1714 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1715 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1716 },
1717 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1718 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1719 },
1720 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1721 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1722 },
1723 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1724 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1725 },
1726 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1727 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1728 },
1729 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1730 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1731 },
1732
1733 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1734 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1735 data interface instead of
1736 communications interface.
1737 Maybe we should define a new
1738 quirk for this. */
1739 },
1740 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1741 .driver_info = NO_UNION_NORMAL,
1742 },
1743 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1744 .driver_info = NO_UNION_NORMAL,
1745 },
1746 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1747 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1748 },
1749 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1750 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1751 },
1752
1753 /* Nokia S60 phones expose two ACM channels. The first is
1754 * a modem and is picked up by the standard AT-command
1755 * information below. The second is 'vendor-specific' but
1756 * is treated as a serial device at the S60 end, so we want
1757 * to expose it on Linux too. */
1758 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1759 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1760 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1761 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1762 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1763 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1764 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1765 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1766 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1767 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1768 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1769 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1770 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1771 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1772 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1773 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1774 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1775 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1776 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1777 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1778 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1779 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1780 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1781 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1782 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1783 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1784 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1785 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1786 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1787 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1788 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1789 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1790 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1791 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1792 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1793 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1794 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1795 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1796 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1797 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1798 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1799 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1800 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1801 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1802 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1803 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1804 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1805 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1806 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1807 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1808 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1809 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1810 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1811 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1812 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1813 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1814 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1815 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1816
1817 /* Support for Owen devices */
1818 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1819
1820 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1821
1822 /* Support for Droids MuIn LCD */
1823 { USB_DEVICE(0x04d8, 0x000b),
1824 .driver_info = NO_DATA_INTERFACE,
1825 },
1826
1827 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1828 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1829 .driver_info = IGNORE_DEVICE,
1830 },
1831 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1832 .driver_info = IGNORE_DEVICE,
1833 },
1834 #endif
1835
1836 /* control interfaces without any protocol set */
1837 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1838 USB_CDC_PROTO_NONE) },
1839
1840 /* control interfaces with various AT-command sets */
1841 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1842 USB_CDC_ACM_PROTO_AT_V25TER) },
1843 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1844 USB_CDC_ACM_PROTO_AT_PCCA101) },
1845 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1846 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1847 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1848 USB_CDC_ACM_PROTO_AT_GSM) },
1849 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1850 USB_CDC_ACM_PROTO_AT_3G) },
1851 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1852 USB_CDC_ACM_PROTO_AT_CDMA) },
1853
1854 { }
1855 };
1856
1857 MODULE_DEVICE_TABLE(usb, acm_ids);
1858
1859 static struct usb_driver acm_driver = {
1860 .name = "cdc_acm",
1861 .probe = acm_probe,
1862 .disconnect = acm_disconnect,
1863 #ifdef CONFIG_PM
1864 .suspend = acm_suspend,
1865 .resume = acm_resume,
1866 .reset_resume = acm_reset_resume,
1867 #endif
1868 .id_table = acm_ids,
1869 #ifdef CONFIG_PM
1870 .supports_autosuspend = 1,
1871 #endif
1872 .disable_hub_initiated_lpm = 1,
1873 };
1874
1875 /*
1876 * TTY driver structures.
1877 */
1878
1879 static const struct tty_operations acm_ops = {
1880 .install = acm_tty_install,
1881 .open = acm_tty_open,
1882 .close = acm_tty_close,
1883 .cleanup = acm_tty_cleanup,
1884 .hangup = acm_tty_hangup,
1885 .write = acm_tty_write,
1886 .write_room = acm_tty_write_room,
1887 .ioctl = acm_tty_ioctl,
1888 .throttle = acm_tty_throttle,
1889 .unthrottle = acm_tty_unthrottle,
1890 .chars_in_buffer = acm_tty_chars_in_buffer,
1891 .break_ctl = acm_tty_break_ctl,
1892 .set_termios = acm_tty_set_termios,
1893 .tiocmget = acm_tty_tiocmget,
1894 .tiocmset = acm_tty_tiocmset,
1895 };
1896
1897 /*
1898 * Init / exit.
1899 */
1900
1901 static int __init acm_init(void)
1902 {
1903 int retval;
1904 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1905 if (!acm_tty_driver)
1906 return -ENOMEM;
1907 acm_tty_driver->driver_name = "acm",
1908 acm_tty_driver->name = "ttyACM",
1909 acm_tty_driver->major = ACM_TTY_MAJOR,
1910 acm_tty_driver->minor_start = 0,
1911 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1912 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1913 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1914 acm_tty_driver->init_termios = tty_std_termios;
1915 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1916 HUPCL | CLOCAL;
1917 tty_set_operations(acm_tty_driver, &acm_ops);
1918
1919 retval = tty_register_driver(acm_tty_driver);
1920 if (retval) {
1921 put_tty_driver(acm_tty_driver);
1922 return retval;
1923 }
1924
1925 retval = usb_register(&acm_driver);
1926 if (retval) {
1927 tty_unregister_driver(acm_tty_driver);
1928 put_tty_driver(acm_tty_driver);
1929 return retval;
1930 }
1931
1932 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1933
1934 return 0;
1935 }
1936
1937 static void __exit acm_exit(void)
1938 {
1939 usb_deregister(&acm_driver);
1940 tty_unregister_driver(acm_tty_driver);
1941 put_tty_driver(acm_tty_driver);
1942 }
1943
1944 module_init(acm_init);
1945 module_exit(acm_exit);
1946
1947 MODULE_AUTHOR(DRIVER_AUTHOR);
1948 MODULE_DESCRIPTION(DRIVER_DESC);
1949 MODULE_LICENSE("GPL");
1950 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
ubuntu-bionic-kernel mirror