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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
57static struct usb_driver acm_driver;
58static struct tty_driver *acm_tty_driver;
59static struct acm *acm_table[ACM_TTY_MINORS];
60
61static DEFINE_MUTEX(open_mutex);
62
63#define ACM_READY(acm) (acm && acm->dev && acm->port.count)
64
65static const struct tty_port_operations acm_port_ops = {
66};
67
68/*
69 * Functions for ACM control messages.
70 */
71
72static int acm_ctrl_msg(struct acm *acm, int request, int value,
73 void *buf, int len)
74{
75 int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
76 request, USB_RT_ACM, value,
77 acm->control->altsetting[0].desc.bInterfaceNumber,
78 buf, len, 5000);
79 dev_dbg(&acm->control->dev,
80 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
81 __func__, request, value, len, retval);
82 return retval < 0 ? retval : 0;
83}
84
85/* devices aren't required to support these requests.
86 * the cdc acm descriptor tells whether they do...
87 */
88#define acm_set_control(acm, control) \
89 acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
90#define acm_set_line(acm, line) \
91 acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
92#define acm_send_break(acm, ms) \
93 acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
94
95/*
96 * Write buffer management.
97 * All of these assume proper locks taken by the caller.
98 */
99
100static int acm_wb_alloc(struct acm *acm)
101{
102 int i, wbn;
103 struct acm_wb *wb;
104
105 wbn = 0;
106 i = 0;
107 for (;;) {
108 wb = &acm->wb[wbn];
109 if (!wb->use) {
110 wb->use = 1;
111 return wbn;
112 }
113 wbn = (wbn + 1) % ACM_NW;
114 if (++i >= ACM_NW)
115 return -1;
116 }
117}
118
119static int acm_wb_is_avail(struct acm *acm)
120{
121 int i, n;
122 unsigned long flags;
123
124 n = ACM_NW;
125 spin_lock_irqsave(&acm->write_lock, flags);
126 for (i = 0; i < ACM_NW; i++)
127 n -= acm->wb[i].use;
128 spin_unlock_irqrestore(&acm->write_lock, flags);
129 return n;
130}
131
132/*
133 * Finish write. Caller must hold acm->write_lock
134 */
135static void acm_write_done(struct acm *acm, struct acm_wb *wb)
136{
137 wb->use = 0;
138 acm->transmitting--;
139 usb_autopm_put_interface_async(acm->control);
140}
141
142/*
143 * Poke write.
144 *
145 * the caller is responsible for locking
146 */
147
148static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
149{
150 int rc;
151
152 acm->transmitting++;
153
154 wb->urb->transfer_buffer = wb->buf;
155 wb->urb->transfer_dma = wb->dmah;
156 wb->urb->transfer_buffer_length = wb->len;
157 wb->urb->dev = acm->dev;
158
159 rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
160 if (rc < 0) {
161 dev_err(&acm->data->dev,
162 "%s - usb_submit_urb(write bulk) failed: %d\n",
163 __func__, rc);
164 acm_write_done(acm, wb);
165 }
166 return rc;
167}
168
169static int acm_write_start(struct acm *acm, int wbn)
170{
171 unsigned long flags;
172 struct acm_wb *wb = &acm->wb[wbn];
173 int rc;
174
175 spin_lock_irqsave(&acm->write_lock, flags);
176 if (!acm->dev) {
177 wb->use = 0;
178 spin_unlock_irqrestore(&acm->write_lock, flags);
179 return -ENODEV;
180 }
181
182 dev_vdbg(&acm->data->dev, "%s - susp_count %d\n", __func__,
183 acm->susp_count);
184 usb_autopm_get_interface_async(acm->control);
185 if (acm->susp_count) {
186 if (!acm->delayed_wb)
187 acm->delayed_wb = wb;
188 else
189 usb_autopm_put_interface_async(acm->control);
190 spin_unlock_irqrestore(&acm->write_lock, flags);
191 return 0; /* A white lie */
192 }
193 usb_mark_last_busy(acm->dev);
194
195 rc = acm_start_wb(acm, wb);
196 spin_unlock_irqrestore(&acm->write_lock, flags);
197
198 return rc;
199
200}
201/*
202 * attributes exported through sysfs
203 */
204static ssize_t show_caps
205(struct device *dev, struct device_attribute *attr, char *buf)
206{
207 struct usb_interface *intf = to_usb_interface(dev);
208 struct acm *acm = usb_get_intfdata(intf);
209
210 return sprintf(buf, "%d", acm->ctrl_caps);
211}
212static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
213
214static ssize_t show_country_codes
215(struct device *dev, struct device_attribute *attr, char *buf)
216{
217 struct usb_interface *intf = to_usb_interface(dev);
218 struct acm *acm = usb_get_intfdata(intf);
219
220 memcpy(buf, acm->country_codes, acm->country_code_size);
221 return acm->country_code_size;
222}
223
224static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
225
226static ssize_t show_country_rel_date
227(struct device *dev, struct device_attribute *attr, char *buf)
228{
229 struct usb_interface *intf = to_usb_interface(dev);
230 struct acm *acm = usb_get_intfdata(intf);
231
232 return sprintf(buf, "%d", acm->country_rel_date);
233}
234
235static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
236/*
237 * Interrupt handlers for various ACM device responses
238 */
239
240/* control interface reports status changes with "interrupt" transfers */
241static void acm_ctrl_irq(struct urb *urb)
242{
243 struct acm *acm = urb->context;
244 struct usb_cdc_notification *dr = urb->transfer_buffer;
245 struct tty_struct *tty;
246 unsigned char *data;
247 int newctrl;
248 int retval;
249 int status = urb->status;
250
251 switch (status) {
252 case 0:
253 /* success */
254 break;
255 case -ECONNRESET:
256 case -ENOENT:
257 case -ESHUTDOWN:
258 /* this urb is terminated, clean up */
259 dev_dbg(&acm->control->dev,
260 "%s - urb shutting down with status: %d\n",
261 __func__, status);
262 return;
263 default:
264 dev_dbg(&acm->control->dev,
265 "%s - nonzero urb status received: %d\n",
266 __func__, status);
267 goto exit;
268 }
269
270 if (!ACM_READY(acm))
271 goto exit;
272
273 usb_mark_last_busy(acm->dev);
274
275 data = (unsigned char *)(dr + 1);
276 switch (dr->bNotificationType) {
277 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
278 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
279 __func__, dr->wValue);
280 break;
281
282 case USB_CDC_NOTIFY_SERIAL_STATE:
283 tty = tty_port_tty_get(&acm->port);
284 newctrl = get_unaligned_le16(data);
285
286 if (tty) {
287 if (!acm->clocal &&
288 (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
289 dev_dbg(&acm->control->dev,
290 "%s - calling hangup\n", __func__);
291 tty_hangup(tty);
292 }
293 tty_kref_put(tty);
294 }
295
296 acm->ctrlin = newctrl;
297
298 dev_dbg(&acm->control->dev,
299 "%s - input control lines: dcd%c dsr%c break%c "
300 "ring%c framing%c parity%c overrun%c\n",
301 __func__,
302 acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
303 acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
304 acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
305 acm->ctrlin & ACM_CTRL_RI ? '+' : '-',
306 acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
307 acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
308 acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
309 break;
310
311 default:
312 dev_dbg(&acm->control->dev,
313 "%s - unknown notification %d received: index %d "
314 "len %d data0 %d data1 %d\n",
315 __func__,
316 dr->bNotificationType, dr->wIndex,
317 dr->wLength, data[0], data[1]);
318 break;
319 }
320exit:
321 retval = usb_submit_urb(urb, GFP_ATOMIC);
322 if (retval)
323 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
324 __func__, retval);
325}
326
327static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
328{
329 int res;
330
331 if (!test_and_clear_bit(index, &acm->read_urbs_free))
332 return 0;
333
334 dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
335
336 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
337 if (res) {
338 if (res != -EPERM) {
339 dev_err(&acm->data->dev,
340 "%s - usb_submit_urb failed: %d\n",
341 __func__, res);
342 }
343 set_bit(index, &acm->read_urbs_free);
344 return res;
345 }
346
347 return 0;
348}
349
350static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
351{
352 int res;
353 int i;
354
355 for (i = 0; i < acm->rx_buflimit; ++i) {
356 res = acm_submit_read_urb(acm, i, mem_flags);
357 if (res)
358 return res;
359 }
360
361 return 0;
362}
363
364static void acm_process_read_urb(struct acm *acm, struct urb *urb)
365{
366 struct tty_struct *tty;
367
368 if (!urb->actual_length)
369 return;
370
371 tty = tty_port_tty_get(&acm->port);
372 if (!tty)
373 return;
374
375 tty_insert_flip_string(tty, urb->transfer_buffer, urb->actual_length);
376 tty_flip_buffer_push(tty);
377
378 tty_kref_put(tty);
379}
380
381static void acm_read_bulk_callback(struct urb *urb)
382{
383 struct acm_rb *rb = urb->context;
384 struct acm *acm = rb->instance;
385 unsigned long flags;
386
387 dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
388 rb->index, urb->actual_length);
389 set_bit(rb->index, &acm->read_urbs_free);
390
391 if (!acm->dev) {
392 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
393 return;
394 }
395 usb_mark_last_busy(acm->dev);
396
397 if (urb->status) {
398 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
399 __func__, urb->status);
400 return;
401 }
402 acm_process_read_urb(acm, urb);
403
404 /* throttle device if requested by tty */
405 spin_lock_irqsave(&acm->read_lock, flags);
406 acm->throttled = acm->throttle_req;
407 if (!acm->throttled && !acm->susp_count) {
408 spin_unlock_irqrestore(&acm->read_lock, flags);
409 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
410 } else {
411 spin_unlock_irqrestore(&acm->read_lock, flags);
412 }
413}
414
415/* data interface wrote those outgoing bytes */
416static void acm_write_bulk(struct urb *urb)
417{
418 struct acm_wb *wb = urb->context;
419 struct acm *acm = wb->instance;
420 unsigned long flags;
421
422 if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
423 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
424 __func__,
425 urb->actual_length,
426 urb->transfer_buffer_length,
427 urb->status);
428
429 spin_lock_irqsave(&acm->write_lock, flags);
430 acm_write_done(acm, wb);
431 spin_unlock_irqrestore(&acm->write_lock, flags);
432 if (ACM_READY(acm))
433 schedule_work(&acm->work);
434}
435
436static void acm_softint(struct work_struct *work)
437{
438 struct acm *acm = container_of(work, struct acm, work);
439 struct tty_struct *tty;
440
441 dev_vdbg(&acm->data->dev, "%s\n", __func__);
442
443 if (!ACM_READY(acm))
444 return;
445 tty = tty_port_tty_get(&acm->port);
446 if (!tty)
447 return;
448 tty_wakeup(tty);
449 tty_kref_put(tty);
450}
451
452/*
453 * TTY handlers
454 */
455
456static int acm_tty_open(struct tty_struct *tty, struct file *filp)
457{
458 struct acm *acm;
459 int rv = -ENODEV;
460
461 mutex_lock(&open_mutex);
462
463 acm = acm_table[tty->index];
464 if (!acm || !acm->dev)
465 goto out;
466 else
467 rv = 0;
468
469 dev_dbg(&acm->control->dev, "%s\n", __func__);
470
471 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
472
473 tty->driver_data = acm;
474 tty_port_tty_set(&acm->port, tty);
475
476 if (usb_autopm_get_interface(acm->control) < 0)
477 goto early_bail;
478 else
479 acm->control->needs_remote_wakeup = 1;
480
481 mutex_lock(&acm->mutex);
482 if (acm->port.count++) {
483 mutex_unlock(&acm->mutex);
484 usb_autopm_put_interface(acm->control);
485 goto out;
486 }
487
488 acm->ctrlurb->dev = acm->dev;
489 if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
490 dev_err(&acm->control->dev,
491 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
492 goto bail_out;
493 }
494
495 if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS) &&
496 (acm->ctrl_caps & USB_CDC_CAP_LINE))
497 goto bail_out;
498
499 usb_autopm_put_interface(acm->control);
500
501 if (acm_submit_read_urbs(acm, GFP_KERNEL))
502 goto bail_out;
503
504 set_bit(ASYNCB_INITIALIZED, &acm->port.flags);
505 rv = tty_port_block_til_ready(&acm->port, tty, filp);
506
507 mutex_unlock(&acm->mutex);
508out:
509 mutex_unlock(&open_mutex);
510 return rv;
511
512bail_out:
513 acm->port.count--;
514 mutex_unlock(&acm->mutex);
515 usb_autopm_put_interface(acm->control);
516early_bail:
517 mutex_unlock(&open_mutex);
518 tty_port_tty_set(&acm->port, NULL);
519 return -EIO;
520}
521
522static void acm_tty_unregister(struct acm *acm)
523{
524 int i;
525
526 tty_unregister_device(acm_tty_driver, acm->minor);
527 usb_put_intf(acm->control);
528 acm_table[acm->minor] = NULL;
529 usb_free_urb(acm->ctrlurb);
530 for (i = 0; i < ACM_NW; i++)
531 usb_free_urb(acm->wb[i].urb);
532 for (i = 0; i < acm->rx_buflimit; i++)
533 usb_free_urb(acm->read_urbs[i]);
534 kfree(acm->country_codes);
535 kfree(acm);
536}
537
538static void acm_port_down(struct acm *acm)
539{
540 int i;
541
542 mutex_lock(&open_mutex);
543 if (acm->dev) {
544 usb_autopm_get_interface(acm->control);
545 acm_set_control(acm, acm->ctrlout = 0);
546 usb_kill_urb(acm->ctrlurb);
547 for (i = 0; i < ACM_NW; i++)
548 usb_kill_urb(acm->wb[i].urb);
549 for (i = 0; i < acm->rx_buflimit; i++)
550 usb_kill_urb(acm->read_urbs[i]);
551 acm->control->needs_remote_wakeup = 0;
552 usb_autopm_put_interface(acm->control);
553 }
554 mutex_unlock(&open_mutex);
555}
556
557static void acm_tty_hangup(struct tty_struct *tty)
558{
559 struct acm *acm = tty->driver_data;
560 tty_port_hangup(&acm->port);
561 acm_port_down(acm);
562}
563
564static void acm_tty_close(struct tty_struct *tty, struct file *filp)
565{
566 struct acm *acm = tty->driver_data;
567
568 /* Perform the closing process and see if we need to do the hardware
569 shutdown */
570 if (!acm)
571 return;
572 if (tty_port_close_start(&acm->port, tty, filp) == 0) {
573 mutex_lock(&open_mutex);
574 if (!acm->dev) {
575 tty_port_tty_set(&acm->port, NULL);
576 acm_tty_unregister(acm);
577 tty->driver_data = NULL;
578 }
579 mutex_unlock(&open_mutex);
580 return;
581 }
582 acm_port_down(acm);
583 tty_port_close_end(&acm->port, tty);
584 tty_port_tty_set(&acm->port, NULL);
585}
586
587static int acm_tty_write(struct tty_struct *tty,
588 const unsigned char *buf, int count)
589{
590 struct acm *acm = tty->driver_data;
591 int stat;
592 unsigned long flags;
593 int wbn;
594 struct acm_wb *wb;
595
596 if (!ACM_READY(acm))
597 return -EINVAL;
598 if (!count)
599 return 0;
600
601 dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
602
603 spin_lock_irqsave(&acm->write_lock, flags);
604 wbn = acm_wb_alloc(acm);
605 if (wbn < 0) {
606 spin_unlock_irqrestore(&acm->write_lock, flags);
607 return 0;
608 }
609 wb = &acm->wb[wbn];
610
611 count = (count > acm->writesize) ? acm->writesize : count;
612 dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
613 memcpy(wb->buf, buf, count);
614 wb->len = count;
615 spin_unlock_irqrestore(&acm->write_lock, flags);
616
617 stat = acm_write_start(acm, wbn);
618 if (stat < 0)
619 return stat;
620 return count;
621}
622
623static int acm_tty_write_room(struct tty_struct *tty)
624{
625 struct acm *acm = tty->driver_data;
626 if (!ACM_READY(acm))
627 return -EINVAL;
628 /*
629 * Do not let the line discipline to know that we have a reserve,
630 * or it might get too enthusiastic.
631 */
632 return acm_wb_is_avail(acm) ? acm->writesize : 0;
633}
634
635static int acm_tty_chars_in_buffer(struct tty_struct *tty)
636{
637 struct acm *acm = tty->driver_data;
638 if (!ACM_READY(acm))
639 return 0;
640 /*
641 * This is inaccurate (overcounts), but it works.
642 */
643 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
644}
645
646static void acm_tty_throttle(struct tty_struct *tty)
647{
648 struct acm *acm = tty->driver_data;
649
650 if (!ACM_READY(acm))
651 return;
652
653 spin_lock_irq(&acm->read_lock);
654 acm->throttle_req = 1;
655 spin_unlock_irq(&acm->read_lock);
656}
657
658static void acm_tty_unthrottle(struct tty_struct *tty)
659{
660 struct acm *acm = tty->driver_data;
661 unsigned int was_throttled;
662
663 if (!ACM_READY(acm))
664 return;
665
666 spin_lock_irq(&acm->read_lock);
667 was_throttled = acm->throttled;
668 acm->throttled = 0;
669 acm->throttle_req = 0;
670 spin_unlock_irq(&acm->read_lock);
671
672 if (was_throttled)
673 acm_submit_read_urbs(acm, GFP_KERNEL);
674}
675
676static int acm_tty_break_ctl(struct tty_struct *tty, int state)
677{
678 struct acm *acm = tty->driver_data;
679 int retval;
680 if (!ACM_READY(acm))
681 return -EINVAL;
682 retval = acm_send_break(acm, state ? 0xffff : 0);
683 if (retval < 0)
684 dev_dbg(&acm->control->dev, "%s - send break failed\n",
685 __func__);
686 return retval;
687}
688
689static int acm_tty_tiocmget(struct tty_struct *tty)
690{
691 struct acm *acm = tty->driver_data;
692
693 if (!ACM_READY(acm))
694 return -EINVAL;
695
696 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
697 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
698 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
699 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
700 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
701 TIOCM_CTS;
702}
703
704static int acm_tty_tiocmset(struct tty_struct *tty,
705 unsigned int set, unsigned int clear)
706{
707 struct acm *acm = tty->driver_data;
708 unsigned int newctrl;
709
710 if (!ACM_READY(acm))
711 return -EINVAL;
712
713 newctrl = acm->ctrlout;
714 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
715 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
716 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
717 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
718
719 newctrl = (newctrl & ~clear) | set;
720
721 if (acm->ctrlout == newctrl)
722 return 0;
723 return acm_set_control(acm, acm->ctrlout = newctrl);
724}
725
726static int acm_tty_ioctl(struct tty_struct *tty,
727 unsigned int cmd, unsigned long arg)
728{
729 struct acm *acm = tty->driver_data;
730
731 if (!ACM_READY(acm))
732 return -EINVAL;
733
734 return -ENOIOCTLCMD;
735}
736
737static const __u32 acm_tty_speed[] = {
738 0, 50, 75, 110, 134, 150, 200, 300, 600,
739 1200, 1800, 2400, 4800, 9600, 19200, 38400,
740 57600, 115200, 230400, 460800, 500000, 576000,
741 921600, 1000000, 1152000, 1500000, 2000000,
742 2500000, 3000000, 3500000, 4000000
743};
744
745static const __u8 acm_tty_size[] = {
746 5, 6, 7, 8
747};
748
749static void acm_tty_set_termios(struct tty_struct *tty,
750 struct ktermios *termios_old)
751{
752 struct acm *acm = tty->driver_data;
753 struct ktermios *termios = tty->termios;
754 struct usb_cdc_line_coding newline;
755 int newctrl = acm->ctrlout;
756
757 if (!ACM_READY(acm))
758 return;
759
760 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
761 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
762 newline.bParityType = termios->c_cflag & PARENB ?
763 (termios->c_cflag & PARODD ? 1 : 2) +
764 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
765 newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4];
766 /* FIXME: Needs to clear unsupported bits in the termios */
767 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
768
769 if (!newline.dwDTERate) {
770 newline.dwDTERate = acm->line.dwDTERate;
771 newctrl &= ~ACM_CTRL_DTR;
772 } else
773 newctrl |= ACM_CTRL_DTR;
774
775 if (newctrl != acm->ctrlout)
776 acm_set_control(acm, acm->ctrlout = newctrl);
777
778 if (memcmp(&acm->line, &newline, sizeof newline)) {
779 memcpy(&acm->line, &newline, sizeof newline);
780 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
781 __func__,
782 le32_to_cpu(newline.dwDTERate),
783 newline.bCharFormat, newline.bParityType,
784 newline.bDataBits);
785 acm_set_line(acm, &acm->line);
786 }
787}
788
789/*
790 * USB probe and disconnect routines.
791 */
792
793/* Little helpers: write/read buffers free */
794static void acm_write_buffers_free(struct acm *acm)
795{
796 int i;
797 struct acm_wb *wb;
798 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
799
800 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
801 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
802}
803
804static void acm_read_buffers_free(struct acm *acm)
805{
806 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
807 int i;
808
809 for (i = 0; i < acm->rx_buflimit; i++)
810 usb_free_coherent(usb_dev, acm->readsize,
811 acm->read_buffers[i].base, acm->read_buffers[i].dma);
812}
813
814/* Little helper: write buffers allocate */
815static int acm_write_buffers_alloc(struct acm *acm)
816{
817 int i;
818 struct acm_wb *wb;
819
820 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
821 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
822 &wb->dmah);
823 if (!wb->buf) {
824 while (i != 0) {
825 --i;
826 --wb;
827 usb_free_coherent(acm->dev, acm->writesize,
828 wb->buf, wb->dmah);
829 }
830 return -ENOMEM;
831 }
832 }
833 return 0;
834}
835
836static int acm_probe(struct usb_interface *intf,
837 const struct usb_device_id *id)
838{
839 struct usb_cdc_union_desc *union_header = NULL;
840 struct usb_cdc_country_functional_desc *cfd = NULL;
841 unsigned char *buffer = intf->altsetting->extra;
842 int buflen = intf->altsetting->extralen;
843 struct usb_interface *control_interface;
844 struct usb_interface *data_interface;
845 struct usb_endpoint_descriptor *epctrl = NULL;
846 struct usb_endpoint_descriptor *epread = NULL;
847 struct usb_endpoint_descriptor *epwrite = NULL;
848 struct usb_device *usb_dev = interface_to_usbdev(intf);
849 struct acm *acm;
850 int minor;
851 int ctrlsize, readsize;
852 u8 *buf;
853 u8 ac_management_function = 0;
854 u8 call_management_function = 0;
855 int call_interface_num = -1;
856 int data_interface_num = -1;
857 unsigned long quirks;
858 int num_rx_buf;
859 int i;
860 int combined_interfaces = 0;
861
862 /* normal quirks */
863 quirks = (unsigned long)id->driver_info;
864 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
865
866 /* handle quirks deadly to normal probing*/
867 if (quirks == NO_UNION_NORMAL) {
868 data_interface = usb_ifnum_to_if(usb_dev, 1);
869 control_interface = usb_ifnum_to_if(usb_dev, 0);
870 goto skip_normal_probe;
871 }
872
873 /* normal probing*/
874 if (!buffer) {
875 dev_err(&intf->dev, "Weird descriptor references\n");
876 return -EINVAL;
877 }
878
879 if (!buflen) {
880 if (intf->cur_altsetting->endpoint &&
881 intf->cur_altsetting->endpoint->extralen &&
882 intf->cur_altsetting->endpoint->extra) {
883 dev_dbg(&intf->dev,
884 "Seeking extra descriptors on endpoint\n");
885 buflen = intf->cur_altsetting->endpoint->extralen;
886 buffer = intf->cur_altsetting->endpoint->extra;
887 } else {
888 dev_err(&intf->dev,
889 "Zero length descriptor references\n");
890 return -EINVAL;
891 }
892 }
893
894 while (buflen > 0) {
895 if (buffer[1] != USB_DT_CS_INTERFACE) {
896 dev_err(&intf->dev, "skipping garbage\n");
897 goto next_desc;
898 }
899
900 switch (buffer[2]) {
901 case USB_CDC_UNION_TYPE: /* we've found it */
902 if (union_header) {
903 dev_err(&intf->dev, "More than one "
904 "union descriptor, skipping ...\n");
905 goto next_desc;
906 }
907 union_header = (struct usb_cdc_union_desc *)buffer;
908 break;
909 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
910 cfd = (struct usb_cdc_country_functional_desc *)buffer;
911 break;
912 case USB_CDC_HEADER_TYPE: /* maybe check version */
913 break; /* for now we ignore it */
914 case USB_CDC_ACM_TYPE:
915 ac_management_function = buffer[3];
916 break;
917 case USB_CDC_CALL_MANAGEMENT_TYPE:
918 call_management_function = buffer[3];
919 call_interface_num = buffer[4];
920 if ( (quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
921 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
922 break;
923 default:
924 /* there are LOTS more CDC descriptors that
925 * could legitimately be found here.
926 */
927 dev_dbg(&intf->dev, "Ignoring descriptor: "
928 "type %02x, length %d\n",
929 buffer[2], buffer[0]);
930 break;
931 }
932next_desc:
933 buflen -= buffer[0];
934 buffer += buffer[0];
935 }
936
937 if (!union_header) {
938 if (call_interface_num > 0) {
939 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
940 /* quirks for Droids MuIn LCD */
941 if (quirks & NO_DATA_INTERFACE)
942 data_interface = usb_ifnum_to_if(usb_dev, 0);
943 else
944 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
945 control_interface = intf;
946 } else {
947 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
948 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
949 return -ENODEV;
950 } else {
951 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
952 combined_interfaces = 1;
953 control_interface = data_interface = intf;
954 goto look_for_collapsed_interface;
955 }
956 }
957 } else {
958 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
959 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
960 if (!control_interface || !data_interface) {
961 dev_dbg(&intf->dev, "no interfaces\n");
962 return -ENODEV;
963 }
964 }
965
966 if (data_interface_num != call_interface_num)
967 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
968
969 if (control_interface == data_interface) {
970 /* some broken devices designed for windows work this way */
971 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
972 combined_interfaces = 1;
973 /* a popular other OS doesn't use it */
974 quirks |= NO_CAP_LINE;
975 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
976 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
977 return -EINVAL;
978 }
979look_for_collapsed_interface:
980 for (i = 0; i < 3; i++) {
981 struct usb_endpoint_descriptor *ep;
982 ep = &data_interface->cur_altsetting->endpoint[i].desc;
983
984 if (usb_endpoint_is_int_in(ep))
985 epctrl = ep;
986 else if (usb_endpoint_is_bulk_out(ep))
987 epwrite = ep;
988 else if (usb_endpoint_is_bulk_in(ep))
989 epread = ep;
990 else
991 return -EINVAL;
992 }
993 if (!epctrl || !epread || !epwrite)
994 return -ENODEV;
995 else
996 goto made_compressed_probe;
997 }
998
999skip_normal_probe:
1000
1001 /*workaround for switched interfaces */
1002 if (data_interface->cur_altsetting->desc.bInterfaceClass
1003 != CDC_DATA_INTERFACE_TYPE) {
1004 if (control_interface->cur_altsetting->desc.bInterfaceClass
1005 == CDC_DATA_INTERFACE_TYPE) {
1006 struct usb_interface *t;
1007 dev_dbg(&intf->dev,
1008 "Your device has switched interfaces.\n");
1009 t = control_interface;
1010 control_interface = data_interface;
1011 data_interface = t;
1012 } else {
1013 return -EINVAL;
1014 }
1015 }
1016
1017 /* Accept probe requests only for the control interface */
1018 if (!combined_interfaces && intf != control_interface)
1019 return -ENODEV;
1020
1021 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1022 /* valid in this context */
1023 dev_dbg(&intf->dev, "The data interface isn't available\n");
1024 return -EBUSY;
1025 }
1026
1027
1028 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2)
1029 return -EINVAL;
1030
1031 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1032 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1033 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1034
1035
1036 /* workaround for switched endpoints */
1037 if (!usb_endpoint_dir_in(epread)) {
1038 /* descriptors are swapped */
1039 struct usb_endpoint_descriptor *t;
1040 dev_dbg(&intf->dev,
1041 "The data interface has switched endpoints\n");
1042 t = epread;
1043 epread = epwrite;
1044 epwrite = t;
1045 }
1046made_compressed_probe:
1047 dev_dbg(&intf->dev, "interfaces are valid\n");
1048 for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++);
1049
1050 if (minor == ACM_TTY_MINORS) {
1051 dev_err(&intf->dev, "no more free acm devices\n");
1052 return -ENODEV;
1053 }
1054
1055 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1056 if (acm == NULL) {
1057 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1058 goto alloc_fail;
1059 }
1060
1061 ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize);
1062 readsize = le16_to_cpu(epread->wMaxPacketSize) *
1063 (quirks == SINGLE_RX_URB ? 1 : 2);
1064 acm->combined_interfaces = combined_interfaces;
1065 acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize) * 20;
1066 acm->control = control_interface;
1067 acm->data = data_interface;
1068 acm->minor = minor;
1069 acm->dev = usb_dev;
1070 acm->ctrl_caps = ac_management_function;
1071 if (quirks & NO_CAP_LINE)
1072 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1073 acm->ctrlsize = ctrlsize;
1074 acm->readsize = readsize;
1075 acm->rx_buflimit = num_rx_buf;
1076 INIT_WORK(&acm->work, acm_softint);
1077 spin_lock_init(&acm->write_lock);
1078 spin_lock_init(&acm->read_lock);
1079 mutex_init(&acm->mutex);
1080 acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1081 acm->is_int_ep = usb_endpoint_xfer_int(epread);
1082 if (acm->is_int_ep)
1083 acm->bInterval = epread->bInterval;
1084 tty_port_init(&acm->port);
1085 acm->port.ops = &acm_port_ops;
1086
1087 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1088 if (!buf) {
1089 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1090 goto alloc_fail2;
1091 }
1092 acm->ctrl_buffer = buf;
1093
1094 if (acm_write_buffers_alloc(acm) < 0) {
1095 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1096 goto alloc_fail4;
1097 }
1098
1099 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1100 if (!acm->ctrlurb) {
1101 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1102 goto alloc_fail5;
1103 }
1104 for (i = 0; i < num_rx_buf; i++) {
1105 struct acm_rb *rb = &(acm->read_buffers[i]);
1106 struct urb *urb;
1107
1108 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1109 &rb->dma);
1110 if (!rb->base) {
1111 dev_err(&intf->dev, "out of memory "
1112 "(read bufs usb_alloc_coherent)\n");
1113 goto alloc_fail6;
1114 }
1115 rb->index = i;
1116 rb->instance = acm;
1117
1118 urb = usb_alloc_urb(0, GFP_KERNEL);
1119 if (!urb) {
1120 dev_err(&intf->dev,
1121 "out of memory (read urbs usb_alloc_urb)\n");
1122 goto alloc_fail6;
1123 }
1124 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1125 urb->transfer_dma = rb->dma;
1126 if (acm->is_int_ep) {
1127 usb_fill_int_urb(urb, acm->dev,
1128 acm->rx_endpoint,
1129 rb->base,
1130 acm->readsize,
1131 acm_read_bulk_callback, rb,
1132 acm->bInterval);
1133 } else {
1134 usb_fill_bulk_urb(urb, acm->dev,
1135 acm->rx_endpoint,
1136 rb->base,
1137 acm->readsize,
1138 acm_read_bulk_callback, rb);
1139 }
1140
1141 acm->read_urbs[i] = urb;
1142 __set_bit(i, &acm->read_urbs_free);
1143 }
1144 for (i = 0; i < ACM_NW; i++) {
1145 struct acm_wb *snd = &(acm->wb[i]);
1146
1147 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1148 if (snd->urb == NULL) {
1149 dev_err(&intf->dev,
1150 "out of memory (write urbs usb_alloc_urb)\n");
1151 goto alloc_fail7;
1152 }
1153
1154 if (usb_endpoint_xfer_int(epwrite))
1155 usb_fill_int_urb(snd->urb, usb_dev,
1156 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1157 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1158 else
1159 usb_fill_bulk_urb(snd->urb, usb_dev,
1160 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1161 NULL, acm->writesize, acm_write_bulk, snd);
1162 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1163 snd->instance = acm;
1164 }
1165
1166 usb_set_intfdata(intf, acm);
1167
1168 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1169 if (i < 0)
1170 goto alloc_fail7;
1171
1172 if (cfd) { /* export the country data */
1173 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1174 if (!acm->country_codes)
1175 goto skip_countries;
1176 acm->country_code_size = cfd->bLength - 4;
1177 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1178 cfd->bLength - 4);
1179 acm->country_rel_date = cfd->iCountryCodeRelDate;
1180
1181 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1182 if (i < 0) {
1183 kfree(acm->country_codes);
1184 goto skip_countries;
1185 }
1186
1187 i = device_create_file(&intf->dev,
1188 &dev_attr_iCountryCodeRelDate);
1189 if (i < 0) {
1190 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1191 kfree(acm->country_codes);
1192 goto skip_countries;
1193 }
1194 }
1195
1196skip_countries:
1197 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1198 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1199 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1200 /* works around buggy devices */
1201 epctrl->bInterval ? epctrl->bInterval : 0xff);
1202 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1203 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1204
1205 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1206
1207 acm_set_control(acm, acm->ctrlout);
1208
1209 acm->line.dwDTERate = cpu_to_le32(9600);
1210 acm->line.bDataBits = 8;
1211 acm_set_line(acm, &acm->line);
1212
1213 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1214 usb_set_intfdata(data_interface, acm);
1215
1216 usb_get_intf(control_interface);
1217 tty_register_device(acm_tty_driver, minor, &control_interface->dev);
1218
1219 acm_table[minor] = acm;
1220
1221 return 0;
1222alloc_fail7:
1223 for (i = 0; i < ACM_NW; i++)
1224 usb_free_urb(acm->wb[i].urb);
1225alloc_fail6:
1226 for (i = 0; i < num_rx_buf; i++)
1227 usb_free_urb(acm->read_urbs[i]);
1228 acm_read_buffers_free(acm);
1229 usb_free_urb(acm->ctrlurb);
1230alloc_fail5:
1231 acm_write_buffers_free(acm);
1232alloc_fail4:
1233 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1234alloc_fail2:
1235 kfree(acm);
1236alloc_fail:
1237 return -ENOMEM;
1238}
1239
1240static void stop_data_traffic(struct acm *acm)
1241{
1242 int i;
1243
1244 dev_dbg(&acm->control->dev, "%s\n", __func__);
1245
1246 usb_kill_urb(acm->ctrlurb);
1247 for (i = 0; i < ACM_NW; i++)
1248 usb_kill_urb(acm->wb[i].urb);
1249 for (i = 0; i < acm->rx_buflimit; i++)
1250 usb_kill_urb(acm->read_urbs[i]);
1251
1252 cancel_work_sync(&acm->work);
1253}
1254
1255static void acm_disconnect(struct usb_interface *intf)
1256{
1257 struct acm *acm = usb_get_intfdata(intf);
1258 struct usb_device *usb_dev = interface_to_usbdev(intf);
1259 struct tty_struct *tty;
1260
1261 /* sibling interface is already cleaning up */
1262 if (!acm)
1263 return;
1264
1265 mutex_lock(&open_mutex);
1266 if (acm->country_codes) {
1267 device_remove_file(&acm->control->dev,
1268 &dev_attr_wCountryCodes);
1269 device_remove_file(&acm->control->dev,
1270 &dev_attr_iCountryCodeRelDate);
1271 }
1272 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1273 acm->dev = NULL;
1274 usb_set_intfdata(acm->control, NULL);
1275 usb_set_intfdata(acm->data, NULL);
1276
1277 stop_data_traffic(acm);
1278
1279 acm_write_buffers_free(acm);
1280 usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer,
1281 acm->ctrl_dma);
1282 acm_read_buffers_free(acm);
1283
1284 if (!acm->combined_interfaces)
1285 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1286 acm->data : acm->control);
1287
1288 if (acm->port.count == 0) {
1289 acm_tty_unregister(acm);
1290 mutex_unlock(&open_mutex);
1291 return;
1292 }
1293
1294 mutex_unlock(&open_mutex);
1295 tty = tty_port_tty_get(&acm->port);
1296 if (tty) {
1297 tty_hangup(tty);
1298 tty_kref_put(tty);
1299 }
1300}
1301
1302#ifdef CONFIG_PM
1303static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1304{
1305 struct acm *acm = usb_get_intfdata(intf);
1306 int cnt;
1307
1308 if (message.event & PM_EVENT_AUTO) {
1309 int b;
1310
1311 spin_lock_irq(&acm->write_lock);
1312 b = acm->transmitting;
1313 spin_unlock_irq(&acm->write_lock);
1314 if (b)
1315 return -EBUSY;
1316 }
1317
1318 spin_lock_irq(&acm->read_lock);
1319 spin_lock(&acm->write_lock);
1320 cnt = acm->susp_count++;
1321 spin_unlock(&acm->write_lock);
1322 spin_unlock_irq(&acm->read_lock);
1323
1324 if (cnt)
1325 return 0;
1326 /*
1327 we treat opened interfaces differently,
1328 we must guard against open
1329 */
1330 mutex_lock(&acm->mutex);
1331
1332 if (acm->port.count)
1333 stop_data_traffic(acm);
1334
1335 mutex_unlock(&acm->mutex);
1336 return 0;
1337}
1338
1339static int acm_resume(struct usb_interface *intf)
1340{
1341 struct acm *acm = usb_get_intfdata(intf);
1342 struct acm_wb *wb;
1343 int rv = 0;
1344 int cnt;
1345
1346 spin_lock_irq(&acm->read_lock);
1347 acm->susp_count -= 1;
1348 cnt = acm->susp_count;
1349 spin_unlock_irq(&acm->read_lock);
1350
1351 if (cnt)
1352 return 0;
1353
1354 mutex_lock(&acm->mutex);
1355 if (acm->port.count) {
1356 rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1357
1358 spin_lock_irq(&acm->write_lock);
1359 if (acm->delayed_wb) {
1360 wb = acm->delayed_wb;
1361 acm->delayed_wb = NULL;
1362 spin_unlock_irq(&acm->write_lock);
1363 acm_start_wb(acm, wb);
1364 } else {
1365 spin_unlock_irq(&acm->write_lock);
1366 }
1367
1368 /*
1369 * delayed error checking because we must
1370 * do the write path at all cost
1371 */
1372 if (rv < 0)
1373 goto err_out;
1374
1375 rv = acm_submit_read_urbs(acm, GFP_NOIO);
1376 }
1377
1378err_out:
1379 mutex_unlock(&acm->mutex);
1380 return rv;
1381}
1382
1383static int acm_reset_resume(struct usb_interface *intf)
1384{
1385 struct acm *acm = usb_get_intfdata(intf);
1386 struct tty_struct *tty;
1387
1388 mutex_lock(&acm->mutex);
1389 if (acm->port.count) {
1390 tty = tty_port_tty_get(&acm->port);
1391 if (tty) {
1392 tty_hangup(tty);
1393 tty_kref_put(tty);
1394 }
1395 }
1396 mutex_unlock(&acm->mutex);
1397 return acm_resume(intf);
1398}
1399
1400#endif /* CONFIG_PM */
1401
1402#define NOKIA_PCSUITE_ACM_INFO(x) \
1403 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1404 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1405 USB_CDC_ACM_PROTO_VENDOR)
1406
1407#define SAMSUNG_PCSUITE_ACM_INFO(x) \
1408 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1409 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1410 USB_CDC_ACM_PROTO_VENDOR)
1411
1412/*
1413 * USB driver structure.
1414 */
1415
1416static const struct usb_device_id acm_ids[] = {
1417 /* quirky and broken devices */
1418 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1419 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1420 },
1421 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1422 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1423 },
1424 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1425 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1426 },
1427 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1428 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1429 },
1430 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1431 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1432 },
1433 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1434 .driver_info = SINGLE_RX_URB,
1435 },
1436 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1437 .driver_info = SINGLE_RX_URB, /* firmware bug */
1438 },
1439 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1440 .driver_info = SINGLE_RX_URB, /* firmware bug */
1441 },
1442 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1443 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1444 },
1445 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1446 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1447 },
1448 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1449 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1450 },
1451 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1452 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1453 },
1454 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1455 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1456 },
1457 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1458 },
1459 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1460 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1461 data interface instead of
1462 communications interface.
1463 Maybe we should define a new
1464 quirk for this. */
1465 },
1466 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1467 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1468 },
1469 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1470 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1471 },
1472
1473 /* Nokia S60 phones expose two ACM channels. The first is
1474 * a modem and is picked up by the standard AT-command
1475 * information below. The second is 'vendor-specific' but
1476 * is treated as a serial device at the S60 end, so we want
1477 * to expose it on Linux too. */
1478 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1479 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1480 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1481 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1482 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1483 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1484 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1485 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1486 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1487 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1488 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1489 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1490 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1491 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1492 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1493 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1494 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1495 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1496 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1497 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1498 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1499 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1500 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1501 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1502 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1503 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1504 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1505 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1506 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1507 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1508 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1509 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1510 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1511 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1512 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1513 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1514 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1515 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1516 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1517 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1518 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1519 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1520 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1521 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1522 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1523 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1524 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1525 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1526 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1527 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1528 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1529 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1530 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1531 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1532 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1533 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1534 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1535 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1536
1537 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1538
1539 /* Support Lego NXT using pbLua firmware */
1540 { USB_DEVICE(0x0694, 0xff00),
1541 .driver_info = NOT_A_MODEM,
1542 },
1543
1544 /* Support for Droids MuIn LCD */
1545 { USB_DEVICE(0x04d8, 0x000b),
1546 .driver_info = NO_DATA_INTERFACE,
1547 },
1548
1549 /* control interfaces without any protocol set */
1550 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1551 USB_CDC_PROTO_NONE) },
1552
1553 /* control interfaces with various AT-command sets */
1554 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1555 USB_CDC_ACM_PROTO_AT_V25TER) },
1556 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1557 USB_CDC_ACM_PROTO_AT_PCCA101) },
1558 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1559 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1560 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1561 USB_CDC_ACM_PROTO_AT_GSM) },
1562 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1563 USB_CDC_ACM_PROTO_AT_3G) },
1564 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1565 USB_CDC_ACM_PROTO_AT_CDMA) },
1566
1567 { }
1568};
1569
1570MODULE_DEVICE_TABLE(usb, acm_ids);
1571
1572static struct usb_driver acm_driver = {
1573 .name = "cdc_acm",
1574 .probe = acm_probe,
1575 .disconnect = acm_disconnect,
1576#ifdef CONFIG_PM
1577 .suspend = acm_suspend,
1578 .resume = acm_resume,
1579 .reset_resume = acm_reset_resume,
1580#endif
1581 .id_table = acm_ids,
1582#ifdef CONFIG_PM
1583 .supports_autosuspend = 1,
1584#endif
1585};
1586
1587/*
1588 * TTY driver structures.
1589 */
1590
1591static const struct tty_operations acm_ops = {
1592 .open = acm_tty_open,
1593 .close = acm_tty_close,
1594 .hangup = acm_tty_hangup,
1595 .write = acm_tty_write,
1596 .write_room = acm_tty_write_room,
1597 .ioctl = acm_tty_ioctl,
1598 .throttle = acm_tty_throttle,
1599 .unthrottle = acm_tty_unthrottle,
1600 .chars_in_buffer = acm_tty_chars_in_buffer,
1601 .break_ctl = acm_tty_break_ctl,
1602 .set_termios = acm_tty_set_termios,
1603 .tiocmget = acm_tty_tiocmget,
1604 .tiocmset = acm_tty_tiocmset,
1605};
1606
1607/*
1608 * Init / exit.
1609 */
1610
1611static int __init acm_init(void)
1612{
1613 int retval;
1614 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1615 if (!acm_tty_driver)
1616 return -ENOMEM;
1617 acm_tty_driver->owner = THIS_MODULE,
1618 acm_tty_driver->driver_name = "acm",
1619 acm_tty_driver->name = "ttyACM",
1620 acm_tty_driver->major = ACM_TTY_MAJOR,
1621 acm_tty_driver->minor_start = 0,
1622 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1623 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1624 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1625 acm_tty_driver->init_termios = tty_std_termios;
1626 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1627 HUPCL | CLOCAL;
1628 tty_set_operations(acm_tty_driver, &acm_ops);
1629
1630 retval = tty_register_driver(acm_tty_driver);
1631 if (retval) {
1632 put_tty_driver(acm_tty_driver);
1633 return retval;
1634 }
1635
1636 retval = usb_register(&acm_driver);
1637 if (retval) {
1638 tty_unregister_driver(acm_tty_driver);
1639 put_tty_driver(acm_tty_driver);
1640 return retval;
1641 }
1642
1643 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1644
1645 return 0;
1646}
1647
1648static void __exit acm_exit(void)
1649{
1650 usb_deregister(&acm_driver);
1651 tty_unregister_driver(acm_tty_driver);
1652 put_tty_driver(acm_tty_driver);
1653}
1654
1655module_init(acm_init);
1656module_exit(acm_exit);
1657
1658MODULE_AUTHOR(DRIVER_AUTHOR);
1659MODULE_DESCRIPTION(DRIVER_DESC);
1660MODULE_LICENSE("GPL");
1661MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * cdc-acm.c
4 *
5 * Copyright (c) 1999 Armin Fuerst <fuerst@in.tum.de>
6 * Copyright (c) 1999 Pavel Machek <pavel@ucw.cz>
7 * Copyright (c) 1999 Johannes Erdfelt <johannes@erdfelt.com>
8 * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz>
9 * Copyright (c) 2004 Oliver Neukum <oliver@neukum.name>
10 * Copyright (c) 2005 David Kubicek <dave@awk.cz>
11 * Copyright (c) 2011 Johan Hovold <jhovold@gmail.com>
12 *
13 * USB Abstract Control Model driver for USB modems and ISDN adapters
14 *
15 * Sponsored by SuSE
16 */
17
18#undef DEBUG
19#undef VERBOSE_DEBUG
20
21#include <linux/kernel.h>
22#include <linux/sched/signal.h>
23#include <linux/errno.h>
24#include <linux/init.h>
25#include <linux/slab.h>
26#include <linux/log2.h>
27#include <linux/tty.h>
28#include <linux/serial.h>
29#include <linux/tty_driver.h>
30#include <linux/tty_flip.h>
31#include <linux/tty_ldisc.h>
32#include <linux/module.h>
33#include <linux/mutex.h>
34#include <linux/uaccess.h>
35#include <linux/usb.h>
36#include <linux/usb/cdc.h>
37#include <asm/byteorder.h>
38#include <asm/unaligned.h>
39#include <linux/idr.h>
40#include <linux/list.h>
41
42#include "cdc-acm.h"
43
44
45#define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
46#define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
47
48static struct usb_driver acm_driver;
49static struct tty_driver *acm_tty_driver;
50
51static DEFINE_IDR(acm_minors);
52static DEFINE_MUTEX(acm_minors_lock);
53
54static void acm_tty_set_termios(struct tty_struct *tty,
55 const struct ktermios *termios_old);
56
57/*
58 * acm_minors accessors
59 */
60
61/*
62 * Look up an ACM structure by minor. If found and not disconnected, increment
63 * its refcount and return it with its mutex held.
64 */
65static struct acm *acm_get_by_minor(unsigned int minor)
66{
67 struct acm *acm;
68
69 mutex_lock(&acm_minors_lock);
70 acm = idr_find(&acm_minors, minor);
71 if (acm) {
72 mutex_lock(&acm->mutex);
73 if (acm->disconnected) {
74 mutex_unlock(&acm->mutex);
75 acm = NULL;
76 } else {
77 tty_port_get(&acm->port);
78 mutex_unlock(&acm->mutex);
79 }
80 }
81 mutex_unlock(&acm_minors_lock);
82 return acm;
83}
84
85/*
86 * Try to find an available minor number and if found, associate it with 'acm'.
87 */
88static int acm_alloc_minor(struct acm *acm)
89{
90 int minor;
91
92 mutex_lock(&acm_minors_lock);
93 minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
94 mutex_unlock(&acm_minors_lock);
95
96 return minor;
97}
98
99/* Release the minor number associated with 'acm'. */
100static void acm_release_minor(struct acm *acm)
101{
102 mutex_lock(&acm_minors_lock);
103 idr_remove(&acm_minors, acm->minor);
104 mutex_unlock(&acm_minors_lock);
105}
106
107/*
108 * Functions for ACM control messages.
109 */
110
111static int acm_ctrl_msg(struct acm *acm, int request, int value,
112 void *buf, int len)
113{
114 int retval;
115
116 retval = usb_autopm_get_interface(acm->control);
117 if (retval)
118 return retval;
119
120 retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
121 request, USB_RT_ACM, value,
122 acm->control->altsetting[0].desc.bInterfaceNumber,
123 buf, len, USB_CTRL_SET_TIMEOUT);
124
125 dev_dbg(&acm->control->dev,
126 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
127 __func__, request, value, len, retval);
128
129 usb_autopm_put_interface(acm->control);
130
131 return retval < 0 ? retval : 0;
132}
133
134/* devices aren't required to support these requests.
135 * the cdc acm descriptor tells whether they do...
136 */
137static inline int acm_set_control(struct acm *acm, int control)
138{
139 if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
140 return -EOPNOTSUPP;
141
142 return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
143 control, NULL, 0);
144}
145
146#define acm_set_line(acm, line) \
147 acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
148#define acm_send_break(acm, ms) \
149 acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
150
151static void acm_poison_urbs(struct acm *acm)
152{
153 int i;
154
155 usb_poison_urb(acm->ctrlurb);
156 for (i = 0; i < ACM_NW; i++)
157 usb_poison_urb(acm->wb[i].urb);
158 for (i = 0; i < acm->rx_buflimit; i++)
159 usb_poison_urb(acm->read_urbs[i]);
160}
161
162static void acm_unpoison_urbs(struct acm *acm)
163{
164 int i;
165
166 for (i = 0; i < acm->rx_buflimit; i++)
167 usb_unpoison_urb(acm->read_urbs[i]);
168 for (i = 0; i < ACM_NW; i++)
169 usb_unpoison_urb(acm->wb[i].urb);
170 usb_unpoison_urb(acm->ctrlurb);
171}
172
173
174/*
175 * Write buffer management.
176 * All of these assume proper locks taken by the caller.
177 */
178
179static int acm_wb_alloc(struct acm *acm)
180{
181 int i, wbn;
182 struct acm_wb *wb;
183
184 wbn = 0;
185 i = 0;
186 for (;;) {
187 wb = &acm->wb[wbn];
188 if (!wb->use) {
189 wb->use = true;
190 wb->len = 0;
191 return wbn;
192 }
193 wbn = (wbn + 1) % ACM_NW;
194 if (++i >= ACM_NW)
195 return -1;
196 }
197}
198
199static int acm_wb_is_avail(struct acm *acm)
200{
201 int i, n;
202 unsigned long flags;
203
204 n = ACM_NW;
205 spin_lock_irqsave(&acm->write_lock, flags);
206 for (i = 0; i < ACM_NW; i++)
207 if(acm->wb[i].use)
208 n--;
209 spin_unlock_irqrestore(&acm->write_lock, flags);
210 return n;
211}
212
213/*
214 * Finish write. Caller must hold acm->write_lock
215 */
216static void acm_write_done(struct acm *acm, struct acm_wb *wb)
217{
218 wb->use = false;
219 acm->transmitting--;
220 usb_autopm_put_interface_async(acm->control);
221}
222
223/*
224 * Poke write.
225 *
226 * the caller is responsible for locking
227 */
228
229static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
230{
231 int rc;
232
233 acm->transmitting++;
234
235 wb->urb->transfer_buffer = wb->buf;
236 wb->urb->transfer_dma = wb->dmah;
237 wb->urb->transfer_buffer_length = wb->len;
238 wb->urb->dev = acm->dev;
239
240 rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
241 if (rc < 0) {
242 if (rc != -EPERM)
243 dev_err(&acm->data->dev,
244 "%s - usb_submit_urb(write bulk) failed: %d\n",
245 __func__, rc);
246 acm_write_done(acm, wb);
247 }
248 return rc;
249}
250
251/*
252 * attributes exported through sysfs
253 */
254static ssize_t bmCapabilities_show
255(struct device *dev, struct device_attribute *attr, char *buf)
256{
257 struct usb_interface *intf = to_usb_interface(dev);
258 struct acm *acm = usb_get_intfdata(intf);
259
260 return sprintf(buf, "%d", acm->ctrl_caps);
261}
262static DEVICE_ATTR_RO(bmCapabilities);
263
264static ssize_t wCountryCodes_show
265(struct device *dev, struct device_attribute *attr, char *buf)
266{
267 struct usb_interface *intf = to_usb_interface(dev);
268 struct acm *acm = usb_get_intfdata(intf);
269
270 memcpy(buf, acm->country_codes, acm->country_code_size);
271 return acm->country_code_size;
272}
273
274static DEVICE_ATTR_RO(wCountryCodes);
275
276static ssize_t iCountryCodeRelDate_show
277(struct device *dev, struct device_attribute *attr, char *buf)
278{
279 struct usb_interface *intf = to_usb_interface(dev);
280 struct acm *acm = usb_get_intfdata(intf);
281
282 return sprintf(buf, "%d", acm->country_rel_date);
283}
284
285static DEVICE_ATTR_RO(iCountryCodeRelDate);
286/*
287 * Interrupt handlers for various ACM device responses
288 */
289
290static void acm_process_notification(struct acm *acm, unsigned char *buf)
291{
292 int newctrl;
293 int difference;
294 unsigned long flags;
295 struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
296 unsigned char *data = buf + sizeof(struct usb_cdc_notification);
297
298 switch (dr->bNotificationType) {
299 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
300 dev_dbg(&acm->control->dev,
301 "%s - network connection: %d\n", __func__, dr->wValue);
302 break;
303
304 case USB_CDC_NOTIFY_SERIAL_STATE:
305 if (le16_to_cpu(dr->wLength) != 2) {
306 dev_dbg(&acm->control->dev,
307 "%s - malformed serial state\n", __func__);
308 break;
309 }
310
311 newctrl = get_unaligned_le16(data);
312 dev_dbg(&acm->control->dev,
313 "%s - serial state: 0x%x\n", __func__, newctrl);
314
315 if (!acm->clocal && (acm->ctrlin & ~newctrl & USB_CDC_SERIAL_STATE_DCD)) {
316 dev_dbg(&acm->control->dev,
317 "%s - calling hangup\n", __func__);
318 tty_port_tty_hangup(&acm->port, false);
319 }
320
321 difference = acm->ctrlin ^ newctrl;
322
323 if ((difference & USB_CDC_SERIAL_STATE_DCD) && acm->port.tty) {
324 struct tty_ldisc *ld = tty_ldisc_ref(acm->port.tty);
325 if (ld) {
326 if (ld->ops->dcd_change)
327 ld->ops->dcd_change(acm->port.tty, newctrl & USB_CDC_SERIAL_STATE_DCD);
328 tty_ldisc_deref(ld);
329 }
330 }
331
332 spin_lock_irqsave(&acm->read_lock, flags);
333 acm->ctrlin = newctrl;
334 acm->oldcount = acm->iocount;
335
336 if (difference & USB_CDC_SERIAL_STATE_DSR)
337 acm->iocount.dsr++;
338 if (difference & USB_CDC_SERIAL_STATE_DCD)
339 acm->iocount.dcd++;
340 if (newctrl & USB_CDC_SERIAL_STATE_BREAK) {
341 acm->iocount.brk++;
342 tty_insert_flip_char(&acm->port, 0, TTY_BREAK);
343 }
344 if (newctrl & USB_CDC_SERIAL_STATE_RING_SIGNAL)
345 acm->iocount.rng++;
346 if (newctrl & USB_CDC_SERIAL_STATE_FRAMING)
347 acm->iocount.frame++;
348 if (newctrl & USB_CDC_SERIAL_STATE_PARITY)
349 acm->iocount.parity++;
350 if (newctrl & USB_CDC_SERIAL_STATE_OVERRUN)
351 acm->iocount.overrun++;
352 spin_unlock_irqrestore(&acm->read_lock, flags);
353
354 if (newctrl & USB_CDC_SERIAL_STATE_BREAK)
355 tty_flip_buffer_push(&acm->port);
356
357 if (difference)
358 wake_up_all(&acm->wioctl);
359
360 break;
361
362 default:
363 dev_dbg(&acm->control->dev,
364 "%s - unknown notification %d received: index %d len %d\n",
365 __func__,
366 dr->bNotificationType, dr->wIndex, dr->wLength);
367 }
368}
369
370/* control interface reports status changes with "interrupt" transfers */
371static void acm_ctrl_irq(struct urb *urb)
372{
373 struct acm *acm = urb->context;
374 struct usb_cdc_notification *dr = urb->transfer_buffer;
375 unsigned int current_size = urb->actual_length;
376 unsigned int expected_size, copy_size, alloc_size;
377 int retval;
378 int status = urb->status;
379
380 switch (status) {
381 case 0:
382 /* success */
383 break;
384 case -ECONNRESET:
385 case -ENOENT:
386 case -ESHUTDOWN:
387 /* this urb is terminated, clean up */
388 dev_dbg(&acm->control->dev,
389 "%s - urb shutting down with status: %d\n",
390 __func__, status);
391 return;
392 default:
393 dev_dbg(&acm->control->dev,
394 "%s - nonzero urb status received: %d\n",
395 __func__, status);
396 goto exit;
397 }
398
399 usb_mark_last_busy(acm->dev);
400
401 if (acm->nb_index)
402 dr = (struct usb_cdc_notification *)acm->notification_buffer;
403
404 /* size = notification-header + (optional) data */
405 expected_size = sizeof(struct usb_cdc_notification) +
406 le16_to_cpu(dr->wLength);
407
408 if (current_size < expected_size) {
409 /* notification is transmitted fragmented, reassemble */
410 if (acm->nb_size < expected_size) {
411 u8 *new_buffer;
412 alloc_size = roundup_pow_of_two(expected_size);
413 /* Final freeing is done on disconnect. */
414 new_buffer = krealloc(acm->notification_buffer,
415 alloc_size, GFP_ATOMIC);
416 if (!new_buffer) {
417 acm->nb_index = 0;
418 goto exit;
419 }
420
421 acm->notification_buffer = new_buffer;
422 acm->nb_size = alloc_size;
423 dr = (struct usb_cdc_notification *)acm->notification_buffer;
424 }
425
426 copy_size = min(current_size,
427 expected_size - acm->nb_index);
428
429 memcpy(&acm->notification_buffer[acm->nb_index],
430 urb->transfer_buffer, copy_size);
431 acm->nb_index += copy_size;
432 current_size = acm->nb_index;
433 }
434
435 if (current_size >= expected_size) {
436 /* notification complete */
437 acm_process_notification(acm, (unsigned char *)dr);
438 acm->nb_index = 0;
439 }
440
441exit:
442 retval = usb_submit_urb(urb, GFP_ATOMIC);
443 if (retval && retval != -EPERM && retval != -ENODEV)
444 dev_err(&acm->control->dev,
445 "%s - usb_submit_urb failed: %d\n", __func__, retval);
446 else
447 dev_vdbg(&acm->control->dev,
448 "control resubmission terminated %d\n", retval);
449}
450
451static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
452{
453 int res;
454
455 if (!test_and_clear_bit(index, &acm->read_urbs_free))
456 return 0;
457
458 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
459 if (res) {
460 if (res != -EPERM && res != -ENODEV) {
461 dev_err(&acm->data->dev,
462 "urb %d failed submission with %d\n",
463 index, res);
464 } else {
465 dev_vdbg(&acm->data->dev, "intended failure %d\n", res);
466 }
467 set_bit(index, &acm->read_urbs_free);
468 return res;
469 } else {
470 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
471 }
472
473 return 0;
474}
475
476static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
477{
478 int res;
479 int i;
480
481 for (i = 0; i < acm->rx_buflimit; ++i) {
482 res = acm_submit_read_urb(acm, i, mem_flags);
483 if (res)
484 return res;
485 }
486
487 return 0;
488}
489
490static void acm_process_read_urb(struct acm *acm, struct urb *urb)
491{
492 unsigned long flags;
493
494 if (!urb->actual_length)
495 return;
496
497 spin_lock_irqsave(&acm->read_lock, flags);
498 tty_insert_flip_string(&acm->port, urb->transfer_buffer,
499 urb->actual_length);
500 spin_unlock_irqrestore(&acm->read_lock, flags);
501
502 tty_flip_buffer_push(&acm->port);
503}
504
505static void acm_read_bulk_callback(struct urb *urb)
506{
507 struct acm_rb *rb = urb->context;
508 struct acm *acm = rb->instance;
509 int status = urb->status;
510 bool stopped = false;
511 bool stalled = false;
512 bool cooldown = false;
513
514 dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
515 rb->index, urb->actual_length, status);
516
517 switch (status) {
518 case 0:
519 usb_mark_last_busy(acm->dev);
520 acm_process_read_urb(acm, urb);
521 break;
522 case -EPIPE:
523 set_bit(EVENT_RX_STALL, &acm->flags);
524 stalled = true;
525 break;
526 case -ENOENT:
527 case -ECONNRESET:
528 case -ESHUTDOWN:
529 dev_dbg(&acm->data->dev,
530 "%s - urb shutting down with status: %d\n",
531 __func__, status);
532 stopped = true;
533 break;
534 case -EOVERFLOW:
535 case -EPROTO:
536 dev_dbg(&acm->data->dev,
537 "%s - cooling babbling device\n", __func__);
538 usb_mark_last_busy(acm->dev);
539 set_bit(rb->index, &acm->urbs_in_error_delay);
540 set_bit(ACM_ERROR_DELAY, &acm->flags);
541 cooldown = true;
542 break;
543 default:
544 dev_dbg(&acm->data->dev,
545 "%s - nonzero urb status received: %d\n",
546 __func__, status);
547 break;
548 }
549
550 /*
551 * Make sure URB processing is done before marking as free to avoid
552 * racing with unthrottle() on another CPU. Matches the barriers
553 * implied by the test_and_clear_bit() in acm_submit_read_urb().
554 */
555 smp_mb__before_atomic();
556 set_bit(rb->index, &acm->read_urbs_free);
557 /*
558 * Make sure URB is marked as free before checking the throttled flag
559 * to avoid racing with unthrottle() on another CPU. Matches the
560 * smp_mb() in unthrottle().
561 */
562 smp_mb__after_atomic();
563
564 if (stopped || stalled || cooldown) {
565 if (stalled)
566 schedule_delayed_work(&acm->dwork, 0);
567 else if (cooldown)
568 schedule_delayed_work(&acm->dwork, HZ / 2);
569 return;
570 }
571
572 if (test_bit(ACM_THROTTLED, &acm->flags))
573 return;
574
575 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
576}
577
578/* data interface wrote those outgoing bytes */
579static void acm_write_bulk(struct urb *urb)
580{
581 struct acm_wb *wb = urb->context;
582 struct acm *acm = wb->instance;
583 unsigned long flags;
584 int status = urb->status;
585
586 if (status || (urb->actual_length != urb->transfer_buffer_length))
587 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
588 urb->actual_length,
589 urb->transfer_buffer_length,
590 status);
591
592 spin_lock_irqsave(&acm->write_lock, flags);
593 acm_write_done(acm, wb);
594 spin_unlock_irqrestore(&acm->write_lock, flags);
595 set_bit(EVENT_TTY_WAKEUP, &acm->flags);
596 schedule_delayed_work(&acm->dwork, 0);
597}
598
599static void acm_softint(struct work_struct *work)
600{
601 int i;
602 struct acm *acm = container_of(work, struct acm, dwork.work);
603
604 if (test_bit(EVENT_RX_STALL, &acm->flags)) {
605 smp_mb(); /* against acm_suspend() */
606 if (!acm->susp_count) {
607 for (i = 0; i < acm->rx_buflimit; i++)
608 usb_kill_urb(acm->read_urbs[i]);
609 usb_clear_halt(acm->dev, acm->in);
610 acm_submit_read_urbs(acm, GFP_KERNEL);
611 clear_bit(EVENT_RX_STALL, &acm->flags);
612 }
613 }
614
615 if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
616 for (i = 0; i < acm->rx_buflimit; i++)
617 if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
618 acm_submit_read_urb(acm, i, GFP_KERNEL);
619 }
620
621 if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
622 tty_port_tty_wakeup(&acm->port);
623}
624
625/*
626 * TTY handlers
627 */
628
629static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
630{
631 struct acm *acm;
632 int retval;
633
634 acm = acm_get_by_minor(tty->index);
635 if (!acm)
636 return -ENODEV;
637
638 retval = tty_standard_install(driver, tty);
639 if (retval)
640 goto error_init_termios;
641
642 /*
643 * Suppress initial echoing for some devices which might send data
644 * immediately after acm driver has been installed.
645 */
646 if (acm->quirks & DISABLE_ECHO)
647 tty->termios.c_lflag &= ~ECHO;
648
649 tty->driver_data = acm;
650
651 return 0;
652
653error_init_termios:
654 tty_port_put(&acm->port);
655 return retval;
656}
657
658static int acm_tty_open(struct tty_struct *tty, struct file *filp)
659{
660 struct acm *acm = tty->driver_data;
661
662 return tty_port_open(&acm->port, tty, filp);
663}
664
665static void acm_port_dtr_rts(struct tty_port *port, bool active)
666{
667 struct acm *acm = container_of(port, struct acm, port);
668 int val;
669 int res;
670
671 if (active)
672 val = USB_CDC_CTRL_DTR | USB_CDC_CTRL_RTS;
673 else
674 val = 0;
675
676 /* FIXME: add missing ctrlout locking throughout driver */
677 acm->ctrlout = val;
678
679 res = acm_set_control(acm, val);
680 if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
681 /* This is broken in too many devices to spam the logs */
682 dev_dbg(&acm->control->dev, "failed to set dtr/rts\n");
683}
684
685static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
686{
687 struct acm *acm = container_of(port, struct acm, port);
688 int retval = -ENODEV;
689 int i;
690
691 mutex_lock(&acm->mutex);
692 if (acm->disconnected)
693 goto disconnected;
694
695 retval = usb_autopm_get_interface(acm->control);
696 if (retval)
697 goto error_get_interface;
698
699 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
700 acm->control->needs_remote_wakeup = 1;
701
702 acm->ctrlurb->dev = acm->dev;
703 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
704 if (retval) {
705 dev_err(&acm->control->dev,
706 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
707 goto error_submit_urb;
708 }
709
710 acm_tty_set_termios(tty, NULL);
711
712 /*
713 * Unthrottle device in case the TTY was closed while throttled.
714 */
715 clear_bit(ACM_THROTTLED, &acm->flags);
716
717 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
718 if (retval)
719 goto error_submit_read_urbs;
720
721 usb_autopm_put_interface(acm->control);
722
723 mutex_unlock(&acm->mutex);
724
725 return 0;
726
727error_submit_read_urbs:
728 for (i = 0; i < acm->rx_buflimit; i++)
729 usb_kill_urb(acm->read_urbs[i]);
730 usb_kill_urb(acm->ctrlurb);
731error_submit_urb:
732 usb_autopm_put_interface(acm->control);
733error_get_interface:
734disconnected:
735 mutex_unlock(&acm->mutex);
736
737 return usb_translate_errors(retval);
738}
739
740static void acm_port_destruct(struct tty_port *port)
741{
742 struct acm *acm = container_of(port, struct acm, port);
743
744 if (acm->minor != ACM_MINOR_INVALID)
745 acm_release_minor(acm);
746 usb_put_intf(acm->control);
747 kfree(acm->country_codes);
748 kfree(acm);
749}
750
751static void acm_port_shutdown(struct tty_port *port)
752{
753 struct acm *acm = container_of(port, struct acm, port);
754 struct urb *urb;
755 struct acm_wb *wb;
756
757 /*
758 * Need to grab write_lock to prevent race with resume, but no need to
759 * hold it due to the tty-port initialised flag.
760 */
761 acm_poison_urbs(acm);
762 spin_lock_irq(&acm->write_lock);
763 spin_unlock_irq(&acm->write_lock);
764
765 usb_autopm_get_interface_no_resume(acm->control);
766 acm->control->needs_remote_wakeup = 0;
767 usb_autopm_put_interface(acm->control);
768
769 for (;;) {
770 urb = usb_get_from_anchor(&acm->delayed);
771 if (!urb)
772 break;
773 wb = urb->context;
774 wb->use = false;
775 usb_autopm_put_interface_async(acm->control);
776 }
777
778 acm_unpoison_urbs(acm);
779
780}
781
782static void acm_tty_cleanup(struct tty_struct *tty)
783{
784 struct acm *acm = tty->driver_data;
785
786 tty_port_put(&acm->port);
787}
788
789static void acm_tty_hangup(struct tty_struct *tty)
790{
791 struct acm *acm = tty->driver_data;
792
793 tty_port_hangup(&acm->port);
794}
795
796static void acm_tty_close(struct tty_struct *tty, struct file *filp)
797{
798 struct acm *acm = tty->driver_data;
799
800 tty_port_close(&acm->port, tty, filp);
801}
802
803static ssize_t acm_tty_write(struct tty_struct *tty, const u8 *buf,
804 size_t count)
805{
806 struct acm *acm = tty->driver_data;
807 int stat;
808 unsigned long flags;
809 int wbn;
810 struct acm_wb *wb;
811
812 if (!count)
813 return 0;
814
815 dev_vdbg(&acm->data->dev, "%zu bytes from tty layer\n", count);
816
817 spin_lock_irqsave(&acm->write_lock, flags);
818 wbn = acm_wb_alloc(acm);
819 if (wbn < 0) {
820 spin_unlock_irqrestore(&acm->write_lock, flags);
821 return 0;
822 }
823 wb = &acm->wb[wbn];
824
825 if (!acm->dev) {
826 wb->use = false;
827 spin_unlock_irqrestore(&acm->write_lock, flags);
828 return -ENODEV;
829 }
830
831 count = (count > acm->writesize) ? acm->writesize : count;
832 dev_vdbg(&acm->data->dev, "writing %zu bytes\n", count);
833 memcpy(wb->buf, buf, count);
834 wb->len = count;
835
836 stat = usb_autopm_get_interface_async(acm->control);
837 if (stat) {
838 wb->use = false;
839 spin_unlock_irqrestore(&acm->write_lock, flags);
840 return stat;
841 }
842
843 if (acm->susp_count) {
844 usb_anchor_urb(wb->urb, &acm->delayed);
845 spin_unlock_irqrestore(&acm->write_lock, flags);
846 return count;
847 }
848
849 stat = acm_start_wb(acm, wb);
850 spin_unlock_irqrestore(&acm->write_lock, flags);
851
852 if (stat < 0)
853 return stat;
854 return count;
855}
856
857static unsigned int acm_tty_write_room(struct tty_struct *tty)
858{
859 struct acm *acm = tty->driver_data;
860 /*
861 * Do not let the line discipline to know that we have a reserve,
862 * or it might get too enthusiastic.
863 */
864 return acm_wb_is_avail(acm) ? acm->writesize : 0;
865}
866
867static void acm_tty_flush_buffer(struct tty_struct *tty)
868{
869 struct acm *acm = tty->driver_data;
870 unsigned long flags;
871 int i;
872
873 spin_lock_irqsave(&acm->write_lock, flags);
874 for (i = 0; i < ACM_NW; i++)
875 if (acm->wb[i].use)
876 usb_unlink_urb(acm->wb[i].urb);
877 spin_unlock_irqrestore(&acm->write_lock, flags);
878}
879
880static unsigned int acm_tty_chars_in_buffer(struct tty_struct *tty)
881{
882 struct acm *acm = tty->driver_data;
883 /*
884 * if the device was unplugged then any remaining characters fell out
885 * of the connector ;)
886 */
887 if (acm->disconnected)
888 return 0;
889 /*
890 * This is inaccurate (overcounts), but it works.
891 */
892 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
893}
894
895static void acm_tty_throttle(struct tty_struct *tty)
896{
897 struct acm *acm = tty->driver_data;
898
899 set_bit(ACM_THROTTLED, &acm->flags);
900}
901
902static void acm_tty_unthrottle(struct tty_struct *tty)
903{
904 struct acm *acm = tty->driver_data;
905
906 clear_bit(ACM_THROTTLED, &acm->flags);
907
908 /* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
909 smp_mb();
910
911 acm_submit_read_urbs(acm, GFP_KERNEL);
912}
913
914static int acm_tty_break_ctl(struct tty_struct *tty, int state)
915{
916 struct acm *acm = tty->driver_data;
917 int retval;
918
919 if (!(acm->ctrl_caps & USB_CDC_CAP_BRK))
920 return -EOPNOTSUPP;
921
922 retval = acm_send_break(acm, state ? 0xffff : 0);
923 if (retval < 0)
924 dev_dbg(&acm->control->dev,
925 "%s - send break failed\n", __func__);
926 return retval;
927}
928
929static int acm_tty_tiocmget(struct tty_struct *tty)
930{
931 struct acm *acm = tty->driver_data;
932
933 return (acm->ctrlout & USB_CDC_CTRL_DTR ? TIOCM_DTR : 0) |
934 (acm->ctrlout & USB_CDC_CTRL_RTS ? TIOCM_RTS : 0) |
935 (acm->ctrlin & USB_CDC_SERIAL_STATE_DSR ? TIOCM_DSR : 0) |
936 (acm->ctrlin & USB_CDC_SERIAL_STATE_RING_SIGNAL ? TIOCM_RI : 0) |
937 (acm->ctrlin & USB_CDC_SERIAL_STATE_DCD ? TIOCM_CD : 0) |
938 TIOCM_CTS;
939}
940
941static int acm_tty_tiocmset(struct tty_struct *tty,
942 unsigned int set, unsigned int clear)
943{
944 struct acm *acm = tty->driver_data;
945 unsigned int newctrl;
946
947 newctrl = acm->ctrlout;
948 set = (set & TIOCM_DTR ? USB_CDC_CTRL_DTR : 0) |
949 (set & TIOCM_RTS ? USB_CDC_CTRL_RTS : 0);
950 clear = (clear & TIOCM_DTR ? USB_CDC_CTRL_DTR : 0) |
951 (clear & TIOCM_RTS ? USB_CDC_CTRL_RTS : 0);
952
953 newctrl = (newctrl & ~clear) | set;
954
955 if (acm->ctrlout == newctrl)
956 return 0;
957 return acm_set_control(acm, acm->ctrlout = newctrl);
958}
959
960static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
961{
962 struct acm *acm = tty->driver_data;
963
964 ss->line = acm->minor;
965 ss->close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
966 ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
967 ASYNC_CLOSING_WAIT_NONE :
968 jiffies_to_msecs(acm->port.closing_wait) / 10;
969 return 0;
970}
971
972static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
973{
974 struct acm *acm = tty->driver_data;
975 unsigned int closing_wait, close_delay;
976 int retval = 0;
977
978 close_delay = msecs_to_jiffies(ss->close_delay * 10);
979 closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
980 ASYNC_CLOSING_WAIT_NONE :
981 msecs_to_jiffies(ss->closing_wait * 10);
982
983 mutex_lock(&acm->port.mutex);
984
985 if (!capable(CAP_SYS_ADMIN)) {
986 if ((close_delay != acm->port.close_delay) ||
987 (closing_wait != acm->port.closing_wait))
988 retval = -EPERM;
989 } else {
990 acm->port.close_delay = close_delay;
991 acm->port.closing_wait = closing_wait;
992 }
993
994 mutex_unlock(&acm->port.mutex);
995 return retval;
996}
997
998static int wait_serial_change(struct acm *acm, unsigned long arg)
999{
1000 int rv = 0;
1001 DECLARE_WAITQUEUE(wait, current);
1002 struct async_icount old, new;
1003
1004 do {
1005 spin_lock_irq(&acm->read_lock);
1006 old = acm->oldcount;
1007 new = acm->iocount;
1008 acm->oldcount = new;
1009 spin_unlock_irq(&acm->read_lock);
1010
1011 if ((arg & TIOCM_DSR) &&
1012 old.dsr != new.dsr)
1013 break;
1014 if ((arg & TIOCM_CD) &&
1015 old.dcd != new.dcd)
1016 break;
1017 if ((arg & TIOCM_RI) &&
1018 old.rng != new.rng)
1019 break;
1020
1021 add_wait_queue(&acm->wioctl, &wait);
1022 set_current_state(TASK_INTERRUPTIBLE);
1023 schedule();
1024 remove_wait_queue(&acm->wioctl, &wait);
1025 if (acm->disconnected) {
1026 if (arg & TIOCM_CD)
1027 break;
1028 else
1029 rv = -ENODEV;
1030 } else {
1031 if (signal_pending(current))
1032 rv = -ERESTARTSYS;
1033 }
1034 } while (!rv);
1035
1036
1037
1038 return rv;
1039}
1040
1041static int acm_tty_get_icount(struct tty_struct *tty,
1042 struct serial_icounter_struct *icount)
1043{
1044 struct acm *acm = tty->driver_data;
1045
1046 icount->dsr = acm->iocount.dsr;
1047 icount->rng = acm->iocount.rng;
1048 icount->dcd = acm->iocount.dcd;
1049 icount->frame = acm->iocount.frame;
1050 icount->overrun = acm->iocount.overrun;
1051 icount->parity = acm->iocount.parity;
1052 icount->brk = acm->iocount.brk;
1053
1054 return 0;
1055}
1056
1057static int acm_tty_ioctl(struct tty_struct *tty,
1058 unsigned int cmd, unsigned long arg)
1059{
1060 struct acm *acm = tty->driver_data;
1061 int rv = -ENOIOCTLCMD;
1062
1063 switch (cmd) {
1064 case TIOCMIWAIT:
1065 rv = usb_autopm_get_interface(acm->control);
1066 if (rv < 0) {
1067 rv = -EIO;
1068 break;
1069 }
1070 rv = wait_serial_change(acm, arg);
1071 usb_autopm_put_interface(acm->control);
1072 break;
1073 }
1074
1075 return rv;
1076}
1077
1078static void acm_tty_set_termios(struct tty_struct *tty,
1079 const struct ktermios *termios_old)
1080{
1081 struct acm *acm = tty->driver_data;
1082 struct ktermios *termios = &tty->termios;
1083 struct usb_cdc_line_coding newline;
1084 int newctrl = acm->ctrlout;
1085
1086 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1087 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1088 newline.bParityType = termios->c_cflag & PARENB ?
1089 (termios->c_cflag & PARODD ? 1 : 2) +
1090 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1091 newline.bDataBits = tty_get_char_size(termios->c_cflag);
1092
1093 /* FIXME: Needs to clear unsupported bits in the termios */
1094 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1095
1096 if (C_BAUD(tty) == B0) {
1097 newline.dwDTERate = acm->line.dwDTERate;
1098 newctrl &= ~USB_CDC_CTRL_DTR;
1099 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1100 newctrl |= USB_CDC_CTRL_DTR;
1101 }
1102
1103 if (newctrl != acm->ctrlout)
1104 acm_set_control(acm, acm->ctrlout = newctrl);
1105
1106 if (memcmp(&acm->line, &newline, sizeof newline)) {
1107 memcpy(&acm->line, &newline, sizeof newline);
1108 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1109 __func__,
1110 le32_to_cpu(newline.dwDTERate),
1111 newline.bCharFormat, newline.bParityType,
1112 newline.bDataBits);
1113 acm_set_line(acm, &acm->line);
1114 }
1115}
1116
1117static const struct tty_port_operations acm_port_ops = {
1118 .dtr_rts = acm_port_dtr_rts,
1119 .shutdown = acm_port_shutdown,
1120 .activate = acm_port_activate,
1121 .destruct = acm_port_destruct,
1122};
1123
1124/*
1125 * USB probe and disconnect routines.
1126 */
1127
1128/* Little helpers: write/read buffers free */
1129static void acm_write_buffers_free(struct acm *acm)
1130{
1131 int i;
1132 struct acm_wb *wb;
1133
1134 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1135 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1136}
1137
1138static void acm_read_buffers_free(struct acm *acm)
1139{
1140 int i;
1141
1142 for (i = 0; i < acm->rx_buflimit; i++)
1143 usb_free_coherent(acm->dev, acm->readsize,
1144 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1145}
1146
1147/* Little helper: write buffers allocate */
1148static int acm_write_buffers_alloc(struct acm *acm)
1149{
1150 int i;
1151 struct acm_wb *wb;
1152
1153 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1154 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1155 &wb->dmah);
1156 if (!wb->buf) {
1157 while (i != 0) {
1158 --i;
1159 --wb;
1160 usb_free_coherent(acm->dev, acm->writesize,
1161 wb->buf, wb->dmah);
1162 }
1163 return -ENOMEM;
1164 }
1165 }
1166 return 0;
1167}
1168
1169static int acm_probe(struct usb_interface *intf,
1170 const struct usb_device_id *id)
1171{
1172 struct usb_cdc_union_desc *union_header = NULL;
1173 struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1174 unsigned char *buffer = intf->altsetting->extra;
1175 int buflen = intf->altsetting->extralen;
1176 struct usb_interface *control_interface;
1177 struct usb_interface *data_interface;
1178 struct usb_endpoint_descriptor *epctrl = NULL;
1179 struct usb_endpoint_descriptor *epread = NULL;
1180 struct usb_endpoint_descriptor *epwrite = NULL;
1181 struct usb_device *usb_dev = interface_to_usbdev(intf);
1182 struct usb_cdc_parsed_header h;
1183 struct acm *acm;
1184 int minor;
1185 int ctrlsize, readsize;
1186 u8 *buf;
1187 int call_intf_num = -1;
1188 int data_intf_num = -1;
1189 unsigned long quirks;
1190 int num_rx_buf;
1191 int i;
1192 int combined_interfaces = 0;
1193 struct device *tty_dev;
1194 int rv = -ENOMEM;
1195 int res;
1196
1197 /* normal quirks */
1198 quirks = (unsigned long)id->driver_info;
1199
1200 if (quirks == IGNORE_DEVICE)
1201 return -ENODEV;
1202
1203 memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1204
1205 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1206
1207 /* handle quirks deadly to normal probing*/
1208 if (quirks == NO_UNION_NORMAL) {
1209 data_interface = usb_ifnum_to_if(usb_dev, 1);
1210 control_interface = usb_ifnum_to_if(usb_dev, 0);
1211 /* we would crash */
1212 if (!data_interface || !control_interface)
1213 return -ENODEV;
1214 goto skip_normal_probe;
1215 }
1216
1217 /* normal probing*/
1218 if (!buffer) {
1219 dev_err(&intf->dev, "Weird descriptor references\n");
1220 return -EINVAL;
1221 }
1222
1223 if (!buflen) {
1224 if (intf->cur_altsetting->endpoint &&
1225 intf->cur_altsetting->endpoint->extralen &&
1226 intf->cur_altsetting->endpoint->extra) {
1227 dev_dbg(&intf->dev,
1228 "Seeking extra descriptors on endpoint\n");
1229 buflen = intf->cur_altsetting->endpoint->extralen;
1230 buffer = intf->cur_altsetting->endpoint->extra;
1231 } else {
1232 dev_err(&intf->dev,
1233 "Zero length descriptor references\n");
1234 return -EINVAL;
1235 }
1236 }
1237
1238 cdc_parse_cdc_header(&h, intf, buffer, buflen);
1239 union_header = h.usb_cdc_union_desc;
1240 cmgmd = h.usb_cdc_call_mgmt_descriptor;
1241 if (cmgmd)
1242 call_intf_num = cmgmd->bDataInterface;
1243
1244 if (!union_header) {
1245 if (intf->cur_altsetting->desc.bNumEndpoints == 3) {
1246 dev_dbg(&intf->dev, "No union descriptor, assuming single interface\n");
1247 combined_interfaces = 1;
1248 control_interface = data_interface = intf;
1249 goto look_for_collapsed_interface;
1250 } else if (call_intf_num > 0) {
1251 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1252 data_intf_num = call_intf_num;
1253 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1254 control_interface = intf;
1255 } else {
1256 dev_dbg(&intf->dev, "No union descriptor, giving up\n");
1257 return -ENODEV;
1258 }
1259 } else {
1260 int class = -1;
1261
1262 data_intf_num = union_header->bSlaveInterface0;
1263 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1264 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1265
1266 if (control_interface)
1267 class = control_interface->cur_altsetting->desc.bInterfaceClass;
1268
1269 if (class != USB_CLASS_COMM && class != USB_CLASS_CDC_DATA) {
1270 dev_dbg(&intf->dev, "Broken union descriptor, assuming single interface\n");
1271 combined_interfaces = 1;
1272 control_interface = data_interface = intf;
1273 goto look_for_collapsed_interface;
1274 }
1275 }
1276
1277 if (!control_interface || !data_interface) {
1278 dev_dbg(&intf->dev, "no interfaces\n");
1279 return -ENODEV;
1280 }
1281
1282 if (data_intf_num != call_intf_num)
1283 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1284
1285 if (control_interface == data_interface) {
1286 /* some broken devices designed for windows work this way */
1287 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1288 combined_interfaces = 1;
1289 /* a popular other OS doesn't use it */
1290 quirks |= NO_CAP_LINE;
1291 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1292 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1293 return -EINVAL;
1294 }
1295look_for_collapsed_interface:
1296 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1297 &epread, &epwrite, &epctrl, NULL);
1298 if (res)
1299 return res;
1300
1301 goto made_compressed_probe;
1302 }
1303
1304skip_normal_probe:
1305
1306 /*workaround for switched interfaces */
1307 if (data_interface->cur_altsetting->desc.bInterfaceClass != USB_CLASS_CDC_DATA) {
1308 if (control_interface->cur_altsetting->desc.bInterfaceClass == USB_CLASS_CDC_DATA) {
1309 dev_dbg(&intf->dev,
1310 "Your device has switched interfaces.\n");
1311 swap(control_interface, data_interface);
1312 } else {
1313 return -EINVAL;
1314 }
1315 }
1316
1317 /* Accept probe requests only for the control interface */
1318 if (!combined_interfaces && intf != control_interface)
1319 return -ENODEV;
1320
1321 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1322 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1323 return -EINVAL;
1324
1325 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1326 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1327 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1328
1329
1330 /* workaround for switched endpoints */
1331 if (!usb_endpoint_dir_in(epread)) {
1332 /* descriptors are swapped */
1333 dev_dbg(&intf->dev,
1334 "The data interface has switched endpoints\n");
1335 swap(epread, epwrite);
1336 }
1337made_compressed_probe:
1338 dev_dbg(&intf->dev, "interfaces are valid\n");
1339
1340 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1341 if (!acm)
1342 return -ENOMEM;
1343
1344 tty_port_init(&acm->port);
1345 acm->port.ops = &acm_port_ops;
1346
1347 ctrlsize = usb_endpoint_maxp(epctrl);
1348 readsize = usb_endpoint_maxp(epread) *
1349 (quirks == SINGLE_RX_URB ? 1 : 2);
1350 acm->combined_interfaces = combined_interfaces;
1351 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1352 acm->control = control_interface;
1353 acm->data = data_interface;
1354
1355 usb_get_intf(acm->control); /* undone in destruct() */
1356
1357 minor = acm_alloc_minor(acm);
1358 if (minor < 0) {
1359 acm->minor = ACM_MINOR_INVALID;
1360 goto err_put_port;
1361 }
1362
1363 acm->minor = minor;
1364 acm->dev = usb_dev;
1365 if (h.usb_cdc_acm_descriptor)
1366 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1367 if (quirks & NO_CAP_LINE)
1368 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1369 acm->ctrlsize = ctrlsize;
1370 acm->readsize = readsize;
1371 acm->rx_buflimit = num_rx_buf;
1372 INIT_DELAYED_WORK(&acm->dwork, acm_softint);
1373 init_waitqueue_head(&acm->wioctl);
1374 spin_lock_init(&acm->write_lock);
1375 spin_lock_init(&acm->read_lock);
1376 mutex_init(&acm->mutex);
1377 if (usb_endpoint_xfer_int(epread)) {
1378 acm->bInterval = epread->bInterval;
1379 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1380 } else {
1381 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1382 }
1383 if (usb_endpoint_xfer_int(epwrite))
1384 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1385 else
1386 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1387 init_usb_anchor(&acm->delayed);
1388 acm->quirks = quirks;
1389
1390 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1391 if (!buf)
1392 goto err_put_port;
1393 acm->ctrl_buffer = buf;
1394
1395 if (acm_write_buffers_alloc(acm) < 0)
1396 goto err_free_ctrl_buffer;
1397
1398 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1399 if (!acm->ctrlurb)
1400 goto err_free_write_buffers;
1401
1402 for (i = 0; i < num_rx_buf; i++) {
1403 struct acm_rb *rb = &(acm->read_buffers[i]);
1404 struct urb *urb;
1405
1406 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1407 &rb->dma);
1408 if (!rb->base)
1409 goto err_free_read_urbs;
1410 rb->index = i;
1411 rb->instance = acm;
1412
1413 urb = usb_alloc_urb(0, GFP_KERNEL);
1414 if (!urb)
1415 goto err_free_read_urbs;
1416
1417 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1418 urb->transfer_dma = rb->dma;
1419 if (usb_endpoint_xfer_int(epread))
1420 usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1421 acm->readsize,
1422 acm_read_bulk_callback, rb,
1423 acm->bInterval);
1424 else
1425 usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1426 acm->readsize,
1427 acm_read_bulk_callback, rb);
1428
1429 acm->read_urbs[i] = urb;
1430 __set_bit(i, &acm->read_urbs_free);
1431 }
1432 for (i = 0; i < ACM_NW; i++) {
1433 struct acm_wb *snd = &(acm->wb[i]);
1434
1435 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1436 if (!snd->urb)
1437 goto err_free_write_urbs;
1438
1439 if (usb_endpoint_xfer_int(epwrite))
1440 usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1441 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1442 else
1443 usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1444 NULL, acm->writesize, acm_write_bulk, snd);
1445 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1446 if (quirks & SEND_ZERO_PACKET)
1447 snd->urb->transfer_flags |= URB_ZERO_PACKET;
1448 snd->instance = acm;
1449 }
1450
1451 usb_set_intfdata(intf, acm);
1452
1453 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1454 if (i < 0)
1455 goto err_free_write_urbs;
1456
1457 if (h.usb_cdc_country_functional_desc) { /* export the country data */
1458 struct usb_cdc_country_functional_desc * cfd =
1459 h.usb_cdc_country_functional_desc;
1460
1461 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1462 if (!acm->country_codes)
1463 goto skip_countries;
1464 acm->country_code_size = cfd->bLength - 4;
1465 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1466 cfd->bLength - 4);
1467 acm->country_rel_date = cfd->iCountryCodeRelDate;
1468
1469 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1470 if (i < 0) {
1471 kfree(acm->country_codes);
1472 acm->country_codes = NULL;
1473 acm->country_code_size = 0;
1474 goto skip_countries;
1475 }
1476
1477 i = device_create_file(&intf->dev,
1478 &dev_attr_iCountryCodeRelDate);
1479 if (i < 0) {
1480 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1481 kfree(acm->country_codes);
1482 acm->country_codes = NULL;
1483 acm->country_code_size = 0;
1484 goto skip_countries;
1485 }
1486 }
1487
1488skip_countries:
1489 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1490 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1491 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1492 /* works around buggy devices */
1493 epctrl->bInterval ? epctrl->bInterval : 16);
1494 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1495 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1496 acm->notification_buffer = NULL;
1497 acm->nb_index = 0;
1498 acm->nb_size = 0;
1499
1500 acm->line.dwDTERate = cpu_to_le32(9600);
1501 acm->line.bDataBits = 8;
1502 acm_set_line(acm, &acm->line);
1503
1504 if (!acm->combined_interfaces) {
1505 rv = usb_driver_claim_interface(&acm_driver, data_interface, acm);
1506 if (rv)
1507 goto err_remove_files;
1508 }
1509
1510 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1511 &control_interface->dev);
1512 if (IS_ERR(tty_dev)) {
1513 rv = PTR_ERR(tty_dev);
1514 goto err_release_data_interface;
1515 }
1516
1517 if (quirks & CLEAR_HALT_CONDITIONS) {
1518 usb_clear_halt(usb_dev, acm->in);
1519 usb_clear_halt(usb_dev, acm->out);
1520 }
1521
1522 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1523
1524 return 0;
1525
1526err_release_data_interface:
1527 if (!acm->combined_interfaces) {
1528 /* Clear driver data so that disconnect() returns early. */
1529 usb_set_intfdata(data_interface, NULL);
1530 usb_driver_release_interface(&acm_driver, data_interface);
1531 }
1532err_remove_files:
1533 if (acm->country_codes) {
1534 device_remove_file(&acm->control->dev,
1535 &dev_attr_wCountryCodes);
1536 device_remove_file(&acm->control->dev,
1537 &dev_attr_iCountryCodeRelDate);
1538 }
1539 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1540err_free_write_urbs:
1541 for (i = 0; i < ACM_NW; i++)
1542 usb_free_urb(acm->wb[i].urb);
1543err_free_read_urbs:
1544 for (i = 0; i < num_rx_buf; i++)
1545 usb_free_urb(acm->read_urbs[i]);
1546 acm_read_buffers_free(acm);
1547 usb_free_urb(acm->ctrlurb);
1548err_free_write_buffers:
1549 acm_write_buffers_free(acm);
1550err_free_ctrl_buffer:
1551 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1552err_put_port:
1553 tty_port_put(&acm->port);
1554
1555 return rv;
1556}
1557
1558static void acm_disconnect(struct usb_interface *intf)
1559{
1560 struct acm *acm = usb_get_intfdata(intf);
1561 struct tty_struct *tty;
1562 int i;
1563
1564 /* sibling interface is already cleaning up */
1565 if (!acm)
1566 return;
1567
1568 acm->disconnected = true;
1569 /*
1570 * there is a circular dependency. acm_softint() can resubmit
1571 * the URBs in error handling so we need to block any
1572 * submission right away
1573 */
1574 acm_poison_urbs(acm);
1575 mutex_lock(&acm->mutex);
1576 if (acm->country_codes) {
1577 device_remove_file(&acm->control->dev,
1578 &dev_attr_wCountryCodes);
1579 device_remove_file(&acm->control->dev,
1580 &dev_attr_iCountryCodeRelDate);
1581 }
1582 wake_up_all(&acm->wioctl);
1583 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1584 usb_set_intfdata(acm->control, NULL);
1585 usb_set_intfdata(acm->data, NULL);
1586 mutex_unlock(&acm->mutex);
1587
1588 tty = tty_port_tty_get(&acm->port);
1589 if (tty) {
1590 tty_vhangup(tty);
1591 tty_kref_put(tty);
1592 }
1593
1594 cancel_delayed_work_sync(&acm->dwork);
1595
1596 tty_unregister_device(acm_tty_driver, acm->minor);
1597
1598 usb_free_urb(acm->ctrlurb);
1599 for (i = 0; i < ACM_NW; i++)
1600 usb_free_urb(acm->wb[i].urb);
1601 for (i = 0; i < acm->rx_buflimit; i++)
1602 usb_free_urb(acm->read_urbs[i]);
1603 acm_write_buffers_free(acm);
1604 usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1605 acm_read_buffers_free(acm);
1606
1607 kfree(acm->notification_buffer);
1608
1609 if (!acm->combined_interfaces)
1610 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1611 acm->data : acm->control);
1612
1613 tty_port_put(&acm->port);
1614}
1615
1616#ifdef CONFIG_PM
1617static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1618{
1619 struct acm *acm = usb_get_intfdata(intf);
1620 int cnt;
1621
1622 spin_lock_irq(&acm->write_lock);
1623 if (PMSG_IS_AUTO(message)) {
1624 if (acm->transmitting) {
1625 spin_unlock_irq(&acm->write_lock);
1626 return -EBUSY;
1627 }
1628 }
1629 cnt = acm->susp_count++;
1630 spin_unlock_irq(&acm->write_lock);
1631
1632 if (cnt)
1633 return 0;
1634
1635 acm_poison_urbs(acm);
1636 cancel_delayed_work_sync(&acm->dwork);
1637 acm->urbs_in_error_delay = 0;
1638
1639 return 0;
1640}
1641
1642static int acm_resume(struct usb_interface *intf)
1643{
1644 struct acm *acm = usb_get_intfdata(intf);
1645 struct urb *urb;
1646 int rv = 0;
1647
1648 spin_lock_irq(&acm->write_lock);
1649
1650 if (--acm->susp_count)
1651 goto out;
1652
1653 acm_unpoison_urbs(acm);
1654
1655 if (tty_port_initialized(&acm->port)) {
1656 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1657
1658 for (;;) {
1659 urb = usb_get_from_anchor(&acm->delayed);
1660 if (!urb)
1661 break;
1662
1663 acm_start_wb(acm, urb->context);
1664 }
1665
1666 /*
1667 * delayed error checking because we must
1668 * do the write path at all cost
1669 */
1670 if (rv < 0)
1671 goto out;
1672
1673 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1674 }
1675out:
1676 spin_unlock_irq(&acm->write_lock);
1677
1678 return rv;
1679}
1680
1681static int acm_reset_resume(struct usb_interface *intf)
1682{
1683 struct acm *acm = usb_get_intfdata(intf);
1684
1685 if (tty_port_initialized(&acm->port))
1686 tty_port_tty_hangup(&acm->port, false);
1687
1688 return acm_resume(intf);
1689}
1690
1691#endif /* CONFIG_PM */
1692
1693static int acm_pre_reset(struct usb_interface *intf)
1694{
1695 struct acm *acm = usb_get_intfdata(intf);
1696
1697 clear_bit(EVENT_RX_STALL, &acm->flags);
1698 acm->nb_index = 0; /* pending control transfers are lost */
1699
1700 return 0;
1701}
1702
1703#define NOKIA_PCSUITE_ACM_INFO(x) \
1704 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1705 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1706 USB_CDC_ACM_PROTO_VENDOR)
1707
1708#define SAMSUNG_PCSUITE_ACM_INFO(x) \
1709 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1710 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1711 USB_CDC_ACM_PROTO_VENDOR)
1712
1713/*
1714 * USB driver structure.
1715 */
1716
1717static const struct usb_device_id acm_ids[] = {
1718 /* quirky and broken devices */
1719 { USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1720 .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
1721 { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1722 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1723 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1724 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1725 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1726 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1727 },
1728 { USB_DEVICE(0x045b, 0x023c), /* Renesas USB Download mode */
1729 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1730 },
1731 { USB_DEVICE(0x045b, 0x0248), /* Renesas USB Download mode */
1732 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1733 },
1734 { USB_DEVICE(0x045b, 0x024D), /* Renesas USB Download mode */
1735 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1736 },
1737 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1738 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1739 },
1740 { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1741 .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1742 },
1743 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1744 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1745 },
1746 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1747 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1748 },
1749 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1750 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1751 },
1752 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1753 .driver_info = SINGLE_RX_URB,
1754 },
1755 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1756 .driver_info = SINGLE_RX_URB, /* firmware bug */
1757 },
1758 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1759 .driver_info = SINGLE_RX_URB, /* firmware bug */
1760 },
1761 { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1762 .driver_info = SINGLE_RX_URB,
1763 },
1764 { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1765 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1766 },
1767 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1768 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1769 },
1770 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1771 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1772 },
1773 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1774 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1775 },
1776 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1777 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1778 },
1779 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1780 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1781 },
1782 { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1783 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1784 },
1785 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1786 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1787 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1788 { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1789 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1790 },
1791 /* Motorola H24 HSPA module: */
1792 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1793 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1794 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1795 },
1796 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1797 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1798 },
1799 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1800 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1801 },
1802 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1803 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1804 },
1805 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1806 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1807 },
1808 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1809 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1810 },
1811 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1812 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1813 },
1814
1815 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1816 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1817 data interface instead of
1818 communications interface.
1819 Maybe we should define a new
1820 quirk for this. */
1821 },
1822 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1823 .driver_info = NO_UNION_NORMAL,
1824 },
1825 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1826 .driver_info = NO_UNION_NORMAL,
1827 },
1828 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1829 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1830 },
1831 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1832 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1833 },
1834 { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1835 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1836 },
1837 { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1838 .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1839 },
1840 { USB_DEVICE(0x0c26, 0x0020), /* Icom ICF3400 Serie */
1841 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1842 },
1843 { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1844 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1845 },
1846
1847 { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1848 .driver_info = CLEAR_HALT_CONDITIONS,
1849 },
1850
1851 /* Nokia S60 phones expose two ACM channels. The first is
1852 * a modem and is picked up by the standard AT-command
1853 * information below. The second is 'vendor-specific' but
1854 * is treated as a serial device at the S60 end, so we want
1855 * to expose it on Linux too. */
1856 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1857 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1858 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1859 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1860 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1861 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1862 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1863 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1864 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1865 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1866 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1867 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1868 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1869 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1870 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1871 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1872 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1873 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1874 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1875 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1876 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1877 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1878 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1879 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1880 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1881 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1882 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1883 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1884 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1885 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1886 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1887 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1888 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1889 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1890 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1891 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1892 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1893 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1894 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1895 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1896 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1897 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1898 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1899 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1900 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1901 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1902 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1903 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1904 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1905 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1906 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1907 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1908 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1909 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1910 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1911 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1912 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1913
1914 /* Support for Owen devices */
1915 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1916
1917 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1918
1919#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1920 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1921 .driver_info = IGNORE_DEVICE,
1922 },
1923 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1924 .driver_info = IGNORE_DEVICE,
1925 },
1926#endif
1927
1928#if IS_ENABLED(CONFIG_IR_TOY)
1929 { USB_DEVICE(0x04d8, 0xfd08),
1930 .driver_info = IGNORE_DEVICE,
1931 },
1932
1933 { USB_DEVICE(0x04d8, 0xf58b),
1934 .driver_info = IGNORE_DEVICE,
1935 },
1936#endif
1937
1938#if IS_ENABLED(CONFIG_USB_SERIAL_XR)
1939 { USB_DEVICE(0x04e2, 0x1400), .driver_info = IGNORE_DEVICE },
1940 { USB_DEVICE(0x04e2, 0x1401), .driver_info = IGNORE_DEVICE },
1941 { USB_DEVICE(0x04e2, 0x1402), .driver_info = IGNORE_DEVICE },
1942 { USB_DEVICE(0x04e2, 0x1403), .driver_info = IGNORE_DEVICE },
1943 { USB_DEVICE(0x04e2, 0x1410), .driver_info = IGNORE_DEVICE },
1944 { USB_DEVICE(0x04e2, 0x1411), .driver_info = IGNORE_DEVICE },
1945 { USB_DEVICE(0x04e2, 0x1412), .driver_info = IGNORE_DEVICE },
1946 { USB_DEVICE(0x04e2, 0x1414), .driver_info = IGNORE_DEVICE },
1947 { USB_DEVICE(0x04e2, 0x1420), .driver_info = IGNORE_DEVICE },
1948 { USB_DEVICE(0x04e2, 0x1422), .driver_info = IGNORE_DEVICE },
1949 { USB_DEVICE(0x04e2, 0x1424), .driver_info = IGNORE_DEVICE },
1950#endif
1951
1952 /*Samsung phone in firmware update mode */
1953 { USB_DEVICE(0x04e8, 0x685d),
1954 .driver_info = IGNORE_DEVICE,
1955 },
1956
1957 /* Exclude Infineon Flash Loader utility */
1958 { USB_DEVICE(0x058b, 0x0041),
1959 .driver_info = IGNORE_DEVICE,
1960 },
1961
1962 /* Exclude ETAS ES58x */
1963 { USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
1964 .driver_info = IGNORE_DEVICE,
1965 },
1966 { USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
1967 .driver_info = IGNORE_DEVICE,
1968 },
1969 { USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
1970 .driver_info = IGNORE_DEVICE,
1971 },
1972
1973 { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1974 .driver_info = SEND_ZERO_PACKET,
1975 },
1976 { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1977 .driver_info = SEND_ZERO_PACKET,
1978 },
1979
1980 /* Exclude Goodix Fingerprint Reader */
1981 { USB_DEVICE(0x27c6, 0x5395),
1982 .driver_info = IGNORE_DEVICE,
1983 },
1984
1985 /* Exclude Heimann Sensor GmbH USB appset demo */
1986 { USB_DEVICE(0x32a7, 0x0000),
1987 .driver_info = IGNORE_DEVICE,
1988 },
1989
1990 /* control interfaces without any protocol set */
1991 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1992 USB_CDC_PROTO_NONE) },
1993
1994 /* control interfaces with various AT-command sets */
1995 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1996 USB_CDC_ACM_PROTO_AT_V25TER) },
1997 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1998 USB_CDC_ACM_PROTO_AT_PCCA101) },
1999 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
2000 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
2001 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
2002 USB_CDC_ACM_PROTO_AT_GSM) },
2003 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
2004 USB_CDC_ACM_PROTO_AT_3G) },
2005 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
2006 USB_CDC_ACM_PROTO_AT_CDMA) },
2007
2008 { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
2009 .driver_info = SEND_ZERO_PACKET,
2010 },
2011
2012 { }
2013};
2014
2015MODULE_DEVICE_TABLE(usb, acm_ids);
2016
2017static struct usb_driver acm_driver = {
2018 .name = "cdc_acm",
2019 .probe = acm_probe,
2020 .disconnect = acm_disconnect,
2021#ifdef CONFIG_PM
2022 .suspend = acm_suspend,
2023 .resume = acm_resume,
2024 .reset_resume = acm_reset_resume,
2025#endif
2026 .pre_reset = acm_pre_reset,
2027 .id_table = acm_ids,
2028#ifdef CONFIG_PM
2029 .supports_autosuspend = 1,
2030#endif
2031 .disable_hub_initiated_lpm = 1,
2032};
2033
2034/*
2035 * TTY driver structures.
2036 */
2037
2038static const struct tty_operations acm_ops = {
2039 .install = acm_tty_install,
2040 .open = acm_tty_open,
2041 .close = acm_tty_close,
2042 .cleanup = acm_tty_cleanup,
2043 .hangup = acm_tty_hangup,
2044 .write = acm_tty_write,
2045 .write_room = acm_tty_write_room,
2046 .flush_buffer = acm_tty_flush_buffer,
2047 .ioctl = acm_tty_ioctl,
2048 .throttle = acm_tty_throttle,
2049 .unthrottle = acm_tty_unthrottle,
2050 .chars_in_buffer = acm_tty_chars_in_buffer,
2051 .break_ctl = acm_tty_break_ctl,
2052 .set_termios = acm_tty_set_termios,
2053 .tiocmget = acm_tty_tiocmget,
2054 .tiocmset = acm_tty_tiocmset,
2055 .get_serial = get_serial_info,
2056 .set_serial = set_serial_info,
2057 .get_icount = acm_tty_get_icount,
2058};
2059
2060/*
2061 * Init / exit.
2062 */
2063
2064static int __init acm_init(void)
2065{
2066 int retval;
2067 acm_tty_driver = tty_alloc_driver(ACM_TTY_MINORS, TTY_DRIVER_REAL_RAW |
2068 TTY_DRIVER_DYNAMIC_DEV);
2069 if (IS_ERR(acm_tty_driver))
2070 return PTR_ERR(acm_tty_driver);
2071 acm_tty_driver->driver_name = "acm",
2072 acm_tty_driver->name = "ttyACM",
2073 acm_tty_driver->major = ACM_TTY_MAJOR,
2074 acm_tty_driver->minor_start = 0,
2075 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2076 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2077 acm_tty_driver->init_termios = tty_std_termios;
2078 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2079 HUPCL | CLOCAL;
2080 tty_set_operations(acm_tty_driver, &acm_ops);
2081
2082 retval = tty_register_driver(acm_tty_driver);
2083 if (retval) {
2084 tty_driver_kref_put(acm_tty_driver);
2085 return retval;
2086 }
2087
2088 retval = usb_register(&acm_driver);
2089 if (retval) {
2090 tty_unregister_driver(acm_tty_driver);
2091 tty_driver_kref_put(acm_tty_driver);
2092 return retval;
2093 }
2094
2095 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2096
2097 return 0;
2098}
2099
2100static void __exit acm_exit(void)
2101{
2102 usb_deregister(&acm_driver);
2103 tty_unregister_driver(acm_tty_driver);
2104 tty_driver_kref_put(acm_tty_driver);
2105 idr_destroy(&acm_minors);
2106}
2107
2108module_init(acm_init);
2109module_exit(acm_exit);
2110
2111MODULE_AUTHOR(DRIVER_AUTHOR);
2112MODULE_DESCRIPTION(DRIVER_DESC);
2113MODULE_LICENSE("GPL");
2114MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);