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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 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, 5000);
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 & ACM_CTRL_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 & ACM_CTRL_DSR)
326 acm->iocount.dsr++;
327 if (difference & ACM_CTRL_DCD)
328 acm->iocount.dcd++;
329 if (newctrl & ACM_CTRL_BRK) {
330 acm->iocount.brk++;
331 tty_insert_flip_char(&acm->port, 0, TTY_BREAK);
332 }
333 if (newctrl & ACM_CTRL_RI)
334 acm->iocount.rng++;
335 if (newctrl & ACM_CTRL_FRAMING)
336 acm->iocount.frame++;
337 if (newctrl & ACM_CTRL_PARITY)
338 acm->iocount.parity++;
339 if (newctrl & ACM_CTRL_OVERRUN)
340 acm->iocount.overrun++;
341 spin_unlock_irqrestore(&acm->read_lock, flags);
342
343 if (newctrl & ACM_CTRL_BRK)
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 = ACM_CTRL_DTR | ACM_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 /*
689 * FIXME: Why do we need this? Allocating 64K of physically contiguous
690 * memory is really nasty...
691 */
692 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
693 acm->control->needs_remote_wakeup = 1;
694
695 acm->ctrlurb->dev = acm->dev;
696 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
697 if (retval) {
698 dev_err(&acm->control->dev,
699 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
700 goto error_submit_urb;
701 }
702
703 acm_tty_set_termios(tty, NULL);
704
705 /*
706 * Unthrottle device in case the TTY was closed while throttled.
707 */
708 clear_bit(ACM_THROTTLED, &acm->flags);
709
710 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
711 if (retval)
712 goto error_submit_read_urbs;
713
714 usb_autopm_put_interface(acm->control);
715
716 mutex_unlock(&acm->mutex);
717
718 return 0;
719
720error_submit_read_urbs:
721 for (i = 0; i < acm->rx_buflimit; i++)
722 usb_kill_urb(acm->read_urbs[i]);
723 usb_kill_urb(acm->ctrlurb);
724error_submit_urb:
725 usb_autopm_put_interface(acm->control);
726error_get_interface:
727disconnected:
728 mutex_unlock(&acm->mutex);
729
730 return usb_translate_errors(retval);
731}
732
733static void acm_port_destruct(struct tty_port *port)
734{
735 struct acm *acm = container_of(port, struct acm, port);
736
737 if (acm->minor != ACM_MINOR_INVALID)
738 acm_release_minor(acm);
739 usb_put_intf(acm->control);
740 kfree(acm->country_codes);
741 kfree(acm);
742}
743
744static void acm_port_shutdown(struct tty_port *port)
745{
746 struct acm *acm = container_of(port, struct acm, port);
747 struct urb *urb;
748 struct acm_wb *wb;
749
750 /*
751 * Need to grab write_lock to prevent race with resume, but no need to
752 * hold it due to the tty-port initialised flag.
753 */
754 acm_poison_urbs(acm);
755 spin_lock_irq(&acm->write_lock);
756 spin_unlock_irq(&acm->write_lock);
757
758 usb_autopm_get_interface_no_resume(acm->control);
759 acm->control->needs_remote_wakeup = 0;
760 usb_autopm_put_interface(acm->control);
761
762 for (;;) {
763 urb = usb_get_from_anchor(&acm->delayed);
764 if (!urb)
765 break;
766 wb = urb->context;
767 wb->use = false;
768 usb_autopm_put_interface_async(acm->control);
769 }
770
771 acm_unpoison_urbs(acm);
772
773}
774
775static void acm_tty_cleanup(struct tty_struct *tty)
776{
777 struct acm *acm = tty->driver_data;
778
779 tty_port_put(&acm->port);
780}
781
782static void acm_tty_hangup(struct tty_struct *tty)
783{
784 struct acm *acm = tty->driver_data;
785
786 tty_port_hangup(&acm->port);
787}
788
789static void acm_tty_close(struct tty_struct *tty, struct file *filp)
790{
791 struct acm *acm = tty->driver_data;
792
793 tty_port_close(&acm->port, tty, filp);
794}
795
796static int acm_tty_write(struct tty_struct *tty,
797 const unsigned char *buf, int count)
798{
799 struct acm *acm = tty->driver_data;
800 int stat;
801 unsigned long flags;
802 int wbn;
803 struct acm_wb *wb;
804
805 if (!count)
806 return 0;
807
808 dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
809
810 spin_lock_irqsave(&acm->write_lock, flags);
811 wbn = acm_wb_alloc(acm);
812 if (wbn < 0) {
813 spin_unlock_irqrestore(&acm->write_lock, flags);
814 return 0;
815 }
816 wb = &acm->wb[wbn];
817
818 if (!acm->dev) {
819 wb->use = false;
820 spin_unlock_irqrestore(&acm->write_lock, flags);
821 return -ENODEV;
822 }
823
824 count = (count > acm->writesize) ? acm->writesize : count;
825 dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
826 memcpy(wb->buf, buf, count);
827 wb->len = count;
828
829 stat = usb_autopm_get_interface_async(acm->control);
830 if (stat) {
831 wb->use = false;
832 spin_unlock_irqrestore(&acm->write_lock, flags);
833 return stat;
834 }
835
836 if (acm->susp_count) {
837 usb_anchor_urb(wb->urb, &acm->delayed);
838 spin_unlock_irqrestore(&acm->write_lock, flags);
839 return count;
840 }
841
842 stat = acm_start_wb(acm, wb);
843 spin_unlock_irqrestore(&acm->write_lock, flags);
844
845 if (stat < 0)
846 return stat;
847 return count;
848}
849
850static unsigned int acm_tty_write_room(struct tty_struct *tty)
851{
852 struct acm *acm = tty->driver_data;
853 /*
854 * Do not let the line discipline to know that we have a reserve,
855 * or it might get too enthusiastic.
856 */
857 return acm_wb_is_avail(acm) ? acm->writesize : 0;
858}
859
860static unsigned int acm_tty_chars_in_buffer(struct tty_struct *tty)
861{
862 struct acm *acm = tty->driver_data;
863 /*
864 * if the device was unplugged then any remaining characters fell out
865 * of the connector ;)
866 */
867 if (acm->disconnected)
868 return 0;
869 /*
870 * This is inaccurate (overcounts), but it works.
871 */
872 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
873}
874
875static void acm_tty_throttle(struct tty_struct *tty)
876{
877 struct acm *acm = tty->driver_data;
878
879 set_bit(ACM_THROTTLED, &acm->flags);
880}
881
882static void acm_tty_unthrottle(struct tty_struct *tty)
883{
884 struct acm *acm = tty->driver_data;
885
886 clear_bit(ACM_THROTTLED, &acm->flags);
887
888 /* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
889 smp_mb();
890
891 acm_submit_read_urbs(acm, GFP_KERNEL);
892}
893
894static int acm_tty_break_ctl(struct tty_struct *tty, int state)
895{
896 struct acm *acm = tty->driver_data;
897 int retval;
898
899 retval = acm_send_break(acm, state ? 0xffff : 0);
900 if (retval < 0)
901 dev_dbg(&acm->control->dev,
902 "%s - send break failed\n", __func__);
903 return retval;
904}
905
906static int acm_tty_tiocmget(struct tty_struct *tty)
907{
908 struct acm *acm = tty->driver_data;
909
910 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
911 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
912 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
913 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
914 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
915 TIOCM_CTS;
916}
917
918static int acm_tty_tiocmset(struct tty_struct *tty,
919 unsigned int set, unsigned int clear)
920{
921 struct acm *acm = tty->driver_data;
922 unsigned int newctrl;
923
924 newctrl = acm->ctrlout;
925 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
926 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
927 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
928 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
929
930 newctrl = (newctrl & ~clear) | set;
931
932 if (acm->ctrlout == newctrl)
933 return 0;
934 return acm_set_control(acm, acm->ctrlout = newctrl);
935}
936
937static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
938{
939 struct acm *acm = tty->driver_data;
940
941 ss->line = acm->minor;
942 ss->close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
943 ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
944 ASYNC_CLOSING_WAIT_NONE :
945 jiffies_to_msecs(acm->port.closing_wait) / 10;
946 return 0;
947}
948
949static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
950{
951 struct acm *acm = tty->driver_data;
952 unsigned int closing_wait, close_delay;
953 int retval = 0;
954
955 close_delay = msecs_to_jiffies(ss->close_delay * 10);
956 closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
957 ASYNC_CLOSING_WAIT_NONE :
958 msecs_to_jiffies(ss->closing_wait * 10);
959
960 mutex_lock(&acm->port.mutex);
961
962 if (!capable(CAP_SYS_ADMIN)) {
963 if ((close_delay != acm->port.close_delay) ||
964 (closing_wait != acm->port.closing_wait))
965 retval = -EPERM;
966 } else {
967 acm->port.close_delay = close_delay;
968 acm->port.closing_wait = closing_wait;
969 }
970
971 mutex_unlock(&acm->port.mutex);
972 return retval;
973}
974
975static int wait_serial_change(struct acm *acm, unsigned long arg)
976{
977 int rv = 0;
978 DECLARE_WAITQUEUE(wait, current);
979 struct async_icount old, new;
980
981 do {
982 spin_lock_irq(&acm->read_lock);
983 old = acm->oldcount;
984 new = acm->iocount;
985 acm->oldcount = new;
986 spin_unlock_irq(&acm->read_lock);
987
988 if ((arg & TIOCM_DSR) &&
989 old.dsr != new.dsr)
990 break;
991 if ((arg & TIOCM_CD) &&
992 old.dcd != new.dcd)
993 break;
994 if ((arg & TIOCM_RI) &&
995 old.rng != new.rng)
996 break;
997
998 add_wait_queue(&acm->wioctl, &wait);
999 set_current_state(TASK_INTERRUPTIBLE);
1000 schedule();
1001 remove_wait_queue(&acm->wioctl, &wait);
1002 if (acm->disconnected) {
1003 if (arg & TIOCM_CD)
1004 break;
1005 else
1006 rv = -ENODEV;
1007 } else {
1008 if (signal_pending(current))
1009 rv = -ERESTARTSYS;
1010 }
1011 } while (!rv);
1012
1013
1014
1015 return rv;
1016}
1017
1018static int acm_tty_get_icount(struct tty_struct *tty,
1019 struct serial_icounter_struct *icount)
1020{
1021 struct acm *acm = tty->driver_data;
1022
1023 icount->dsr = acm->iocount.dsr;
1024 icount->rng = acm->iocount.rng;
1025 icount->dcd = acm->iocount.dcd;
1026 icount->frame = acm->iocount.frame;
1027 icount->overrun = acm->iocount.overrun;
1028 icount->parity = acm->iocount.parity;
1029 icount->brk = acm->iocount.brk;
1030
1031 return 0;
1032}
1033
1034static int acm_tty_ioctl(struct tty_struct *tty,
1035 unsigned int cmd, unsigned long arg)
1036{
1037 struct acm *acm = tty->driver_data;
1038 int rv = -ENOIOCTLCMD;
1039
1040 switch (cmd) {
1041 case TIOCMIWAIT:
1042 rv = usb_autopm_get_interface(acm->control);
1043 if (rv < 0) {
1044 rv = -EIO;
1045 break;
1046 }
1047 rv = wait_serial_change(acm, arg);
1048 usb_autopm_put_interface(acm->control);
1049 break;
1050 }
1051
1052 return rv;
1053}
1054
1055static void acm_tty_set_termios(struct tty_struct *tty,
1056 struct ktermios *termios_old)
1057{
1058 struct acm *acm = tty->driver_data;
1059 struct ktermios *termios = &tty->termios;
1060 struct usb_cdc_line_coding newline;
1061 int newctrl = acm->ctrlout;
1062
1063 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1064 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1065 newline.bParityType = termios->c_cflag & PARENB ?
1066 (termios->c_cflag & PARODD ? 1 : 2) +
1067 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1068 newline.bDataBits = tty_get_char_size(termios->c_cflag);
1069
1070 /* FIXME: Needs to clear unsupported bits in the termios */
1071 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1072
1073 if (C_BAUD(tty) == B0) {
1074 newline.dwDTERate = acm->line.dwDTERate;
1075 newctrl &= ~ACM_CTRL_DTR;
1076 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1077 newctrl |= ACM_CTRL_DTR;
1078 }
1079
1080 if (newctrl != acm->ctrlout)
1081 acm_set_control(acm, acm->ctrlout = newctrl);
1082
1083 if (memcmp(&acm->line, &newline, sizeof newline)) {
1084 memcpy(&acm->line, &newline, sizeof newline);
1085 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1086 __func__,
1087 le32_to_cpu(newline.dwDTERate),
1088 newline.bCharFormat, newline.bParityType,
1089 newline.bDataBits);
1090 acm_set_line(acm, &acm->line);
1091 }
1092}
1093
1094static const struct tty_port_operations acm_port_ops = {
1095 .dtr_rts = acm_port_dtr_rts,
1096 .shutdown = acm_port_shutdown,
1097 .activate = acm_port_activate,
1098 .destruct = acm_port_destruct,
1099};
1100
1101/*
1102 * USB probe and disconnect routines.
1103 */
1104
1105/* Little helpers: write/read buffers free */
1106static void acm_write_buffers_free(struct acm *acm)
1107{
1108 int i;
1109 struct acm_wb *wb;
1110
1111 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1112 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1113}
1114
1115static void acm_read_buffers_free(struct acm *acm)
1116{
1117 int i;
1118
1119 for (i = 0; i < acm->rx_buflimit; i++)
1120 usb_free_coherent(acm->dev, acm->readsize,
1121 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1122}
1123
1124/* Little helper: write buffers allocate */
1125static int acm_write_buffers_alloc(struct acm *acm)
1126{
1127 int i;
1128 struct acm_wb *wb;
1129
1130 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1131 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1132 &wb->dmah);
1133 if (!wb->buf) {
1134 while (i != 0) {
1135 --i;
1136 --wb;
1137 usb_free_coherent(acm->dev, acm->writesize,
1138 wb->buf, wb->dmah);
1139 }
1140 return -ENOMEM;
1141 }
1142 }
1143 return 0;
1144}
1145
1146static int acm_probe(struct usb_interface *intf,
1147 const struct usb_device_id *id)
1148{
1149 struct usb_cdc_union_desc *union_header = NULL;
1150 struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1151 unsigned char *buffer = intf->altsetting->extra;
1152 int buflen = intf->altsetting->extralen;
1153 struct usb_interface *control_interface;
1154 struct usb_interface *data_interface;
1155 struct usb_endpoint_descriptor *epctrl = NULL;
1156 struct usb_endpoint_descriptor *epread = NULL;
1157 struct usb_endpoint_descriptor *epwrite = NULL;
1158 struct usb_device *usb_dev = interface_to_usbdev(intf);
1159 struct usb_cdc_parsed_header h;
1160 struct acm *acm;
1161 int minor;
1162 int ctrlsize, readsize;
1163 u8 *buf;
1164 int call_intf_num = -1;
1165 int data_intf_num = -1;
1166 unsigned long quirks;
1167 int num_rx_buf;
1168 int i;
1169 int combined_interfaces = 0;
1170 struct device *tty_dev;
1171 int rv = -ENOMEM;
1172 int res;
1173
1174 /* normal quirks */
1175 quirks = (unsigned long)id->driver_info;
1176
1177 if (quirks == IGNORE_DEVICE)
1178 return -ENODEV;
1179
1180 memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1181
1182 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1183
1184 /* handle quirks deadly to normal probing*/
1185 if (quirks == NO_UNION_NORMAL) {
1186 data_interface = usb_ifnum_to_if(usb_dev, 1);
1187 control_interface = usb_ifnum_to_if(usb_dev, 0);
1188 /* we would crash */
1189 if (!data_interface || !control_interface)
1190 return -ENODEV;
1191 goto skip_normal_probe;
1192 }
1193
1194 /* normal probing*/
1195 if (!buffer) {
1196 dev_err(&intf->dev, "Weird descriptor references\n");
1197 return -EINVAL;
1198 }
1199
1200 if (!buflen) {
1201 if (intf->cur_altsetting->endpoint &&
1202 intf->cur_altsetting->endpoint->extralen &&
1203 intf->cur_altsetting->endpoint->extra) {
1204 dev_dbg(&intf->dev,
1205 "Seeking extra descriptors on endpoint\n");
1206 buflen = intf->cur_altsetting->endpoint->extralen;
1207 buffer = intf->cur_altsetting->endpoint->extra;
1208 } else {
1209 dev_err(&intf->dev,
1210 "Zero length descriptor references\n");
1211 return -EINVAL;
1212 }
1213 }
1214
1215 cdc_parse_cdc_header(&h, intf, buffer, buflen);
1216 union_header = h.usb_cdc_union_desc;
1217 cmgmd = h.usb_cdc_call_mgmt_descriptor;
1218 if (cmgmd)
1219 call_intf_num = cmgmd->bDataInterface;
1220
1221 if (!union_header) {
1222 if (intf->cur_altsetting->desc.bNumEndpoints == 3) {
1223 dev_dbg(&intf->dev, "No union descriptor, assuming single interface\n");
1224 combined_interfaces = 1;
1225 control_interface = data_interface = intf;
1226 goto look_for_collapsed_interface;
1227 } else if (call_intf_num > 0) {
1228 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1229 data_intf_num = call_intf_num;
1230 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1231 control_interface = intf;
1232 } else {
1233 dev_dbg(&intf->dev, "No union descriptor, giving up\n");
1234 return -ENODEV;
1235 }
1236 } else {
1237 int class = -1;
1238
1239 data_intf_num = union_header->bSlaveInterface0;
1240 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1241 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1242
1243 if (control_interface)
1244 class = control_interface->cur_altsetting->desc.bInterfaceClass;
1245
1246 if (class != USB_CLASS_COMM && class != USB_CLASS_CDC_DATA) {
1247 dev_dbg(&intf->dev, "Broken union descriptor, assuming single interface\n");
1248 combined_interfaces = 1;
1249 control_interface = data_interface = intf;
1250 goto look_for_collapsed_interface;
1251 }
1252 }
1253
1254 if (!control_interface || !data_interface) {
1255 dev_dbg(&intf->dev, "no interfaces\n");
1256 return -ENODEV;
1257 }
1258
1259 if (data_intf_num != call_intf_num)
1260 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1261
1262 if (control_interface == data_interface) {
1263 /* some broken devices designed for windows work this way */
1264 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1265 combined_interfaces = 1;
1266 /* a popular other OS doesn't use it */
1267 quirks |= NO_CAP_LINE;
1268 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1269 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1270 return -EINVAL;
1271 }
1272look_for_collapsed_interface:
1273 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1274 &epread, &epwrite, &epctrl, NULL);
1275 if (res)
1276 return res;
1277
1278 goto made_compressed_probe;
1279 }
1280
1281skip_normal_probe:
1282
1283 /*workaround for switched interfaces */
1284 if (data_interface->cur_altsetting->desc.bInterfaceClass != USB_CLASS_CDC_DATA) {
1285 if (control_interface->cur_altsetting->desc.bInterfaceClass == USB_CLASS_CDC_DATA) {
1286 dev_dbg(&intf->dev,
1287 "Your device has switched interfaces.\n");
1288 swap(control_interface, data_interface);
1289 } else {
1290 return -EINVAL;
1291 }
1292 }
1293
1294 /* Accept probe requests only for the control interface */
1295 if (!combined_interfaces && intf != control_interface)
1296 return -ENODEV;
1297
1298 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1299 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1300 return -EINVAL;
1301
1302 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1303 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1304 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1305
1306
1307 /* workaround for switched endpoints */
1308 if (!usb_endpoint_dir_in(epread)) {
1309 /* descriptors are swapped */
1310 dev_dbg(&intf->dev,
1311 "The data interface has switched endpoints\n");
1312 swap(epread, epwrite);
1313 }
1314made_compressed_probe:
1315 dev_dbg(&intf->dev, "interfaces are valid\n");
1316
1317 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1318 if (!acm)
1319 return -ENOMEM;
1320
1321 tty_port_init(&acm->port);
1322 acm->port.ops = &acm_port_ops;
1323
1324 ctrlsize = usb_endpoint_maxp(epctrl);
1325 readsize = usb_endpoint_maxp(epread) *
1326 (quirks == SINGLE_RX_URB ? 1 : 2);
1327 acm->combined_interfaces = combined_interfaces;
1328 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1329 acm->control = control_interface;
1330 acm->data = data_interface;
1331
1332 usb_get_intf(acm->control); /* undone in destruct() */
1333
1334 minor = acm_alloc_minor(acm);
1335 if (minor < 0) {
1336 acm->minor = ACM_MINOR_INVALID;
1337 goto err_put_port;
1338 }
1339
1340 acm->minor = minor;
1341 acm->dev = usb_dev;
1342 if (h.usb_cdc_acm_descriptor)
1343 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1344 if (quirks & NO_CAP_LINE)
1345 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1346 acm->ctrlsize = ctrlsize;
1347 acm->readsize = readsize;
1348 acm->rx_buflimit = num_rx_buf;
1349 INIT_DELAYED_WORK(&acm->dwork, acm_softint);
1350 init_waitqueue_head(&acm->wioctl);
1351 spin_lock_init(&acm->write_lock);
1352 spin_lock_init(&acm->read_lock);
1353 mutex_init(&acm->mutex);
1354 if (usb_endpoint_xfer_int(epread)) {
1355 acm->bInterval = epread->bInterval;
1356 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1357 } else {
1358 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1359 }
1360 if (usb_endpoint_xfer_int(epwrite))
1361 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1362 else
1363 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1364 init_usb_anchor(&acm->delayed);
1365 acm->quirks = quirks;
1366
1367 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1368 if (!buf)
1369 goto err_put_port;
1370 acm->ctrl_buffer = buf;
1371
1372 if (acm_write_buffers_alloc(acm) < 0)
1373 goto err_free_ctrl_buffer;
1374
1375 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1376 if (!acm->ctrlurb)
1377 goto err_free_write_buffers;
1378
1379 for (i = 0; i < num_rx_buf; i++) {
1380 struct acm_rb *rb = &(acm->read_buffers[i]);
1381 struct urb *urb;
1382
1383 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1384 &rb->dma);
1385 if (!rb->base)
1386 goto err_free_read_urbs;
1387 rb->index = i;
1388 rb->instance = acm;
1389
1390 urb = usb_alloc_urb(0, GFP_KERNEL);
1391 if (!urb)
1392 goto err_free_read_urbs;
1393
1394 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1395 urb->transfer_dma = rb->dma;
1396 if (usb_endpoint_xfer_int(epread))
1397 usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1398 acm->readsize,
1399 acm_read_bulk_callback, rb,
1400 acm->bInterval);
1401 else
1402 usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1403 acm->readsize,
1404 acm_read_bulk_callback, rb);
1405
1406 acm->read_urbs[i] = urb;
1407 __set_bit(i, &acm->read_urbs_free);
1408 }
1409 for (i = 0; i < ACM_NW; i++) {
1410 struct acm_wb *snd = &(acm->wb[i]);
1411
1412 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1413 if (!snd->urb)
1414 goto err_free_write_urbs;
1415
1416 if (usb_endpoint_xfer_int(epwrite))
1417 usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1418 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1419 else
1420 usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1421 NULL, acm->writesize, acm_write_bulk, snd);
1422 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1423 if (quirks & SEND_ZERO_PACKET)
1424 snd->urb->transfer_flags |= URB_ZERO_PACKET;
1425 snd->instance = acm;
1426 }
1427
1428 usb_set_intfdata(intf, acm);
1429
1430 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1431 if (i < 0)
1432 goto err_free_write_urbs;
1433
1434 if (h.usb_cdc_country_functional_desc) { /* export the country data */
1435 struct usb_cdc_country_functional_desc * cfd =
1436 h.usb_cdc_country_functional_desc;
1437
1438 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1439 if (!acm->country_codes)
1440 goto skip_countries;
1441 acm->country_code_size = cfd->bLength - 4;
1442 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1443 cfd->bLength - 4);
1444 acm->country_rel_date = cfd->iCountryCodeRelDate;
1445
1446 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1447 if (i < 0) {
1448 kfree(acm->country_codes);
1449 acm->country_codes = NULL;
1450 acm->country_code_size = 0;
1451 goto skip_countries;
1452 }
1453
1454 i = device_create_file(&intf->dev,
1455 &dev_attr_iCountryCodeRelDate);
1456 if (i < 0) {
1457 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1458 kfree(acm->country_codes);
1459 acm->country_codes = NULL;
1460 acm->country_code_size = 0;
1461 goto skip_countries;
1462 }
1463 }
1464
1465skip_countries:
1466 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1467 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1468 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1469 /* works around buggy devices */
1470 epctrl->bInterval ? epctrl->bInterval : 16);
1471 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1472 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1473 acm->notification_buffer = NULL;
1474 acm->nb_index = 0;
1475 acm->nb_size = 0;
1476
1477 acm->line.dwDTERate = cpu_to_le32(9600);
1478 acm->line.bDataBits = 8;
1479 acm_set_line(acm, &acm->line);
1480
1481 if (!acm->combined_interfaces) {
1482 rv = usb_driver_claim_interface(&acm_driver, data_interface, acm);
1483 if (rv)
1484 goto err_remove_files;
1485 }
1486
1487 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1488 &control_interface->dev);
1489 if (IS_ERR(tty_dev)) {
1490 rv = PTR_ERR(tty_dev);
1491 goto err_release_data_interface;
1492 }
1493
1494 if (quirks & CLEAR_HALT_CONDITIONS) {
1495 usb_clear_halt(usb_dev, acm->in);
1496 usb_clear_halt(usb_dev, acm->out);
1497 }
1498
1499 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1500
1501 return 0;
1502
1503err_release_data_interface:
1504 if (!acm->combined_interfaces) {
1505 /* Clear driver data so that disconnect() returns early. */
1506 usb_set_intfdata(data_interface, NULL);
1507 usb_driver_release_interface(&acm_driver, data_interface);
1508 }
1509err_remove_files:
1510 if (acm->country_codes) {
1511 device_remove_file(&acm->control->dev,
1512 &dev_attr_wCountryCodes);
1513 device_remove_file(&acm->control->dev,
1514 &dev_attr_iCountryCodeRelDate);
1515 }
1516 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1517err_free_write_urbs:
1518 for (i = 0; i < ACM_NW; i++)
1519 usb_free_urb(acm->wb[i].urb);
1520err_free_read_urbs:
1521 for (i = 0; i < num_rx_buf; i++)
1522 usb_free_urb(acm->read_urbs[i]);
1523 acm_read_buffers_free(acm);
1524 usb_free_urb(acm->ctrlurb);
1525err_free_write_buffers:
1526 acm_write_buffers_free(acm);
1527err_free_ctrl_buffer:
1528 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1529err_put_port:
1530 tty_port_put(&acm->port);
1531
1532 return rv;
1533}
1534
1535static void acm_disconnect(struct usb_interface *intf)
1536{
1537 struct acm *acm = usb_get_intfdata(intf);
1538 struct tty_struct *tty;
1539 int i;
1540
1541 /* sibling interface is already cleaning up */
1542 if (!acm)
1543 return;
1544
1545 acm->disconnected = true;
1546 /*
1547 * there is a circular dependency. acm_softint() can resubmit
1548 * the URBs in error handling so we need to block any
1549 * submission right away
1550 */
1551 acm_poison_urbs(acm);
1552 mutex_lock(&acm->mutex);
1553 if (acm->country_codes) {
1554 device_remove_file(&acm->control->dev,
1555 &dev_attr_wCountryCodes);
1556 device_remove_file(&acm->control->dev,
1557 &dev_attr_iCountryCodeRelDate);
1558 }
1559 wake_up_all(&acm->wioctl);
1560 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1561 usb_set_intfdata(acm->control, NULL);
1562 usb_set_intfdata(acm->data, NULL);
1563 mutex_unlock(&acm->mutex);
1564
1565 tty = tty_port_tty_get(&acm->port);
1566 if (tty) {
1567 tty_vhangup(tty);
1568 tty_kref_put(tty);
1569 }
1570
1571 cancel_delayed_work_sync(&acm->dwork);
1572
1573 tty_unregister_device(acm_tty_driver, acm->minor);
1574
1575 usb_free_urb(acm->ctrlurb);
1576 for (i = 0; i < ACM_NW; i++)
1577 usb_free_urb(acm->wb[i].urb);
1578 for (i = 0; i < acm->rx_buflimit; i++)
1579 usb_free_urb(acm->read_urbs[i]);
1580 acm_write_buffers_free(acm);
1581 usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1582 acm_read_buffers_free(acm);
1583
1584 kfree(acm->notification_buffer);
1585
1586 if (!acm->combined_interfaces)
1587 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1588 acm->data : acm->control);
1589
1590 tty_port_put(&acm->port);
1591}
1592
1593#ifdef CONFIG_PM
1594static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1595{
1596 struct acm *acm = usb_get_intfdata(intf);
1597 int cnt;
1598
1599 spin_lock_irq(&acm->write_lock);
1600 if (PMSG_IS_AUTO(message)) {
1601 if (acm->transmitting) {
1602 spin_unlock_irq(&acm->write_lock);
1603 return -EBUSY;
1604 }
1605 }
1606 cnt = acm->susp_count++;
1607 spin_unlock_irq(&acm->write_lock);
1608
1609 if (cnt)
1610 return 0;
1611
1612 acm_poison_urbs(acm);
1613 cancel_delayed_work_sync(&acm->dwork);
1614 acm->urbs_in_error_delay = 0;
1615
1616 return 0;
1617}
1618
1619static int acm_resume(struct usb_interface *intf)
1620{
1621 struct acm *acm = usb_get_intfdata(intf);
1622 struct urb *urb;
1623 int rv = 0;
1624
1625 spin_lock_irq(&acm->write_lock);
1626
1627 if (--acm->susp_count)
1628 goto out;
1629
1630 acm_unpoison_urbs(acm);
1631
1632 if (tty_port_initialized(&acm->port)) {
1633 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1634
1635 for (;;) {
1636 urb = usb_get_from_anchor(&acm->delayed);
1637 if (!urb)
1638 break;
1639
1640 acm_start_wb(acm, urb->context);
1641 }
1642
1643 /*
1644 * delayed error checking because we must
1645 * do the write path at all cost
1646 */
1647 if (rv < 0)
1648 goto out;
1649
1650 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1651 }
1652out:
1653 spin_unlock_irq(&acm->write_lock);
1654
1655 return rv;
1656}
1657
1658static int acm_reset_resume(struct usb_interface *intf)
1659{
1660 struct acm *acm = usb_get_intfdata(intf);
1661
1662 if (tty_port_initialized(&acm->port))
1663 tty_port_tty_hangup(&acm->port, false);
1664
1665 return acm_resume(intf);
1666}
1667
1668#endif /* CONFIG_PM */
1669
1670static int acm_pre_reset(struct usb_interface *intf)
1671{
1672 struct acm *acm = usb_get_intfdata(intf);
1673
1674 clear_bit(EVENT_RX_STALL, &acm->flags);
1675 acm->nb_index = 0; /* pending control transfers are lost */
1676
1677 return 0;
1678}
1679
1680#define NOKIA_PCSUITE_ACM_INFO(x) \
1681 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1682 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1683 USB_CDC_ACM_PROTO_VENDOR)
1684
1685#define SAMSUNG_PCSUITE_ACM_INFO(x) \
1686 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1687 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1688 USB_CDC_ACM_PROTO_VENDOR)
1689
1690/*
1691 * USB driver structure.
1692 */
1693
1694static const struct usb_device_id acm_ids[] = {
1695 /* quirky and broken devices */
1696 { USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1697 .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
1698 { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1699 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1700 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1701 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1702 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1703 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1704 },
1705 { USB_DEVICE(0x045b, 0x023c), /* Renesas USB Download mode */
1706 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1707 },
1708 { USB_DEVICE(0x045b, 0x0248), /* Renesas USB Download mode */
1709 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1710 },
1711 { USB_DEVICE(0x045b, 0x024D), /* Renesas USB Download mode */
1712 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1713 },
1714 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1715 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1716 },
1717 { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1718 .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1719 },
1720 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1721 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1722 },
1723 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1724 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1725 },
1726 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1727 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1728 },
1729 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1730 .driver_info = SINGLE_RX_URB,
1731 },
1732 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1733 .driver_info = SINGLE_RX_URB, /* firmware bug */
1734 },
1735 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1736 .driver_info = SINGLE_RX_URB, /* firmware bug */
1737 },
1738 { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1739 .driver_info = SINGLE_RX_URB,
1740 },
1741 { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1742 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1743 },
1744 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1745 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1746 },
1747 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1748 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1749 },
1750 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1751 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1752 },
1753 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1754 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1755 },
1756 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1757 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1758 },
1759 { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1760 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1761 },
1762 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1763 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1764 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1765 { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1766 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1767 },
1768 /* Motorola H24 HSPA module: */
1769 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1770 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1771 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1772 },
1773 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1774 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1775 },
1776 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1777 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1778 },
1779 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1780 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1781 },
1782 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1783 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1784 },
1785 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1786 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1787 },
1788 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1789 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1790 },
1791
1792 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1793 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1794 data interface instead of
1795 communications interface.
1796 Maybe we should define a new
1797 quirk for this. */
1798 },
1799 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1800 .driver_info = NO_UNION_NORMAL,
1801 },
1802 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1803 .driver_info = NO_UNION_NORMAL,
1804 },
1805 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1806 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1807 },
1808 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1809 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1810 },
1811 { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1812 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1813 },
1814 { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1815 .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1816 },
1817 { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1818 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1819 },
1820
1821 { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1822 .driver_info = CLEAR_HALT_CONDITIONS,
1823 },
1824
1825 /* Nokia S60 phones expose two ACM channels. The first is
1826 * a modem and is picked up by the standard AT-command
1827 * information below. The second is 'vendor-specific' but
1828 * is treated as a serial device at the S60 end, so we want
1829 * to expose it on Linux too. */
1830 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1831 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1832 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1833 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1834 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1835 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1836 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1837 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1838 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1839 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1840 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1841 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1842 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1843 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1844 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1845 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1846 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1847 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1848 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1849 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1850 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1851 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1852 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1853 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1854 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1855 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1856 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1857 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1858 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1859 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1860 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1861 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1862 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1863 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1864 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1865 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1866 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1867 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1868 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1869 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1870 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1871 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1872 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1873 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1874 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1875 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1876 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1877 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1878 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1879 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1880 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1881 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1882 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1883 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1884 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1885 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1886 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1887 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1888
1889 /* Support for Owen devices */
1890 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1891
1892 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1893
1894#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1895 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1896 .driver_info = IGNORE_DEVICE,
1897 },
1898 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1899 .driver_info = IGNORE_DEVICE,
1900 },
1901#endif
1902
1903#if IS_ENABLED(CONFIG_IR_TOY)
1904 { USB_DEVICE(0x04d8, 0xfd08),
1905 .driver_info = IGNORE_DEVICE,
1906 },
1907
1908 { USB_DEVICE(0x04d8, 0xf58b),
1909 .driver_info = IGNORE_DEVICE,
1910 },
1911#endif
1912
1913#if IS_ENABLED(CONFIG_USB_SERIAL_XR)
1914 { USB_DEVICE(0x04e2, 0x1400), .driver_info = IGNORE_DEVICE },
1915 { USB_DEVICE(0x04e2, 0x1401), .driver_info = IGNORE_DEVICE },
1916 { USB_DEVICE(0x04e2, 0x1402), .driver_info = IGNORE_DEVICE },
1917 { USB_DEVICE(0x04e2, 0x1403), .driver_info = IGNORE_DEVICE },
1918 { USB_DEVICE(0x04e2, 0x1410), .driver_info = IGNORE_DEVICE },
1919 { USB_DEVICE(0x04e2, 0x1411), .driver_info = IGNORE_DEVICE },
1920 { USB_DEVICE(0x04e2, 0x1412), .driver_info = IGNORE_DEVICE },
1921 { USB_DEVICE(0x04e2, 0x1414), .driver_info = IGNORE_DEVICE },
1922 { USB_DEVICE(0x04e2, 0x1420), .driver_info = IGNORE_DEVICE },
1923 { USB_DEVICE(0x04e2, 0x1422), .driver_info = IGNORE_DEVICE },
1924 { USB_DEVICE(0x04e2, 0x1424), .driver_info = IGNORE_DEVICE },
1925#endif
1926
1927 /*Samsung phone in firmware update mode */
1928 { USB_DEVICE(0x04e8, 0x685d),
1929 .driver_info = IGNORE_DEVICE,
1930 },
1931
1932 /* Exclude Infineon Flash Loader utility */
1933 { USB_DEVICE(0x058b, 0x0041),
1934 .driver_info = IGNORE_DEVICE,
1935 },
1936
1937 /* Exclude ETAS ES58x */
1938 { USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
1939 .driver_info = IGNORE_DEVICE,
1940 },
1941 { USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
1942 .driver_info = IGNORE_DEVICE,
1943 },
1944 { USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
1945 .driver_info = IGNORE_DEVICE,
1946 },
1947
1948 { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1949 .driver_info = SEND_ZERO_PACKET,
1950 },
1951 { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1952 .driver_info = SEND_ZERO_PACKET,
1953 },
1954
1955 /* Exclude Goodix Fingerprint Reader */
1956 { USB_DEVICE(0x27c6, 0x5395),
1957 .driver_info = IGNORE_DEVICE,
1958 },
1959
1960 /* Exclude Heimann Sensor GmbH USB appset demo */
1961 { USB_DEVICE(0x32a7, 0x0000),
1962 .driver_info = IGNORE_DEVICE,
1963 },
1964
1965 /* control interfaces without any protocol set */
1966 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1967 USB_CDC_PROTO_NONE) },
1968
1969 /* control interfaces with various AT-command sets */
1970 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1971 USB_CDC_ACM_PROTO_AT_V25TER) },
1972 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1973 USB_CDC_ACM_PROTO_AT_PCCA101) },
1974 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1975 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1976 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1977 USB_CDC_ACM_PROTO_AT_GSM) },
1978 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1979 USB_CDC_ACM_PROTO_AT_3G) },
1980 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1981 USB_CDC_ACM_PROTO_AT_CDMA) },
1982
1983 { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1984 .driver_info = SEND_ZERO_PACKET,
1985 },
1986
1987 { }
1988};
1989
1990MODULE_DEVICE_TABLE(usb, acm_ids);
1991
1992static struct usb_driver acm_driver = {
1993 .name = "cdc_acm",
1994 .probe = acm_probe,
1995 .disconnect = acm_disconnect,
1996#ifdef CONFIG_PM
1997 .suspend = acm_suspend,
1998 .resume = acm_resume,
1999 .reset_resume = acm_reset_resume,
2000#endif
2001 .pre_reset = acm_pre_reset,
2002 .id_table = acm_ids,
2003#ifdef CONFIG_PM
2004 .supports_autosuspend = 1,
2005#endif
2006 .disable_hub_initiated_lpm = 1,
2007};
2008
2009/*
2010 * TTY driver structures.
2011 */
2012
2013static const struct tty_operations acm_ops = {
2014 .install = acm_tty_install,
2015 .open = acm_tty_open,
2016 .close = acm_tty_close,
2017 .cleanup = acm_tty_cleanup,
2018 .hangup = acm_tty_hangup,
2019 .write = acm_tty_write,
2020 .write_room = acm_tty_write_room,
2021 .ioctl = acm_tty_ioctl,
2022 .throttle = acm_tty_throttle,
2023 .unthrottle = acm_tty_unthrottle,
2024 .chars_in_buffer = acm_tty_chars_in_buffer,
2025 .break_ctl = acm_tty_break_ctl,
2026 .set_termios = acm_tty_set_termios,
2027 .tiocmget = acm_tty_tiocmget,
2028 .tiocmset = acm_tty_tiocmset,
2029 .get_serial = get_serial_info,
2030 .set_serial = set_serial_info,
2031 .get_icount = acm_tty_get_icount,
2032};
2033
2034/*
2035 * Init / exit.
2036 */
2037
2038static int __init acm_init(void)
2039{
2040 int retval;
2041 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
2042 if (!acm_tty_driver)
2043 return -ENOMEM;
2044 acm_tty_driver->driver_name = "acm",
2045 acm_tty_driver->name = "ttyACM",
2046 acm_tty_driver->major = ACM_TTY_MAJOR,
2047 acm_tty_driver->minor_start = 0,
2048 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2049 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2050 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2051 acm_tty_driver->init_termios = tty_std_termios;
2052 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2053 HUPCL | CLOCAL;
2054 tty_set_operations(acm_tty_driver, &acm_ops);
2055
2056 retval = tty_register_driver(acm_tty_driver);
2057 if (retval) {
2058 put_tty_driver(acm_tty_driver);
2059 return retval;
2060 }
2061
2062 retval = usb_register(&acm_driver);
2063 if (retval) {
2064 tty_unregister_driver(acm_tty_driver);
2065 put_tty_driver(acm_tty_driver);
2066 return retval;
2067 }
2068
2069 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2070
2071 return 0;
2072}
2073
2074static void __exit acm_exit(void)
2075{
2076 usb_deregister(&acm_driver);
2077 tty_unregister_driver(acm_tty_driver);
2078 put_tty_driver(acm_tty_driver);
2079 idr_destroy(&acm_minors);
2080}
2081
2082module_init(acm_init);
2083module_exit(acm_exit);
2084
2085MODULE_AUTHOR(DRIVER_AUTHOR);
2086MODULE_DESCRIPTION(DRIVER_DESC);
2087MODULE_LICENSE("GPL");
2088MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);