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