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USB: cdc-acm: fix unthrottle races
[linux/fpc-iii.git] / drivers / usb / class / cdc-acm.c
blobc03aa8550980d4249e299d7c3cff9c5743ddc778
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
47 static struct usb_driver acm_driver;
48 static struct tty_driver *acm_tty_driver;
49
50 static DEFINE_IDR(acm_minors);
51 static DEFINE_MUTEX(acm_minors_lock);
52
53 static 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 */
64 static 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 */
87 static 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'. */
99 static 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
110 static 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 */
136 static 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
150 static void acm_kill_urbs(struct acm *acm)
151 {
152 int i;
153
154 usb_kill_urb(acm->ctrlurb);
155 for (i = 0; i < ACM_NW; i++)
156 usb_kill_urb(acm->wb[i].urb);
157 for (i = 0; i < acm->rx_buflimit; i++)
158 usb_kill_urb(acm->read_urbs[i]);
159 }
160
161 /*
162 * Write buffer management.
163 * All of these assume proper locks taken by the caller.
164 */
165
166 static int acm_wb_alloc(struct acm *acm)
167 {
168 int i, wbn;
169 struct acm_wb *wb;
170
171 wbn = 0;
172 i = 0;
173 for (;;) {
174 wb = &acm->wb[wbn];
175 if (!wb->use) {
176 wb->use = 1;
177 wb->len = 0;
178 return wbn;
179 }
180 wbn = (wbn + 1) % ACM_NW;
181 if (++i >= ACM_NW)
182 return -1;
183 }
184 }
185
186 static int acm_wb_is_avail(struct acm *acm)
187 {
188 int i, n;
189 unsigned long flags;
190
191 n = ACM_NW;
192 spin_lock_irqsave(&acm->write_lock, flags);
193 for (i = 0; i < ACM_NW; i++)
194 n -= acm->wb[i].use;
195 spin_unlock_irqrestore(&acm->write_lock, flags);
196 return n;
197 }
198
199 /*
200 * Finish write. Caller must hold acm->write_lock
201 */
202 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
203 {
204 wb->use = 0;
205 acm->transmitting--;
206 usb_autopm_put_interface_async(acm->control);
207 }
208
209 /*
210 * Poke write.
211 *
212 * the caller is responsible for locking
213 */
214
215 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
216 {
217 int rc;
218
219 acm->transmitting++;
220
221 wb->urb->transfer_buffer = wb->buf;
222 wb->urb->transfer_dma = wb->dmah;
223 wb->urb->transfer_buffer_length = wb->len;
224 wb->urb->dev = acm->dev;
225
226 rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
227 if (rc < 0) {
228 dev_err(&acm->data->dev,
229 "%s - usb_submit_urb(write bulk) failed: %d\n",
230 __func__, rc);
231 acm_write_done(acm, wb);
232 }
233 return rc;
234 }
235
236 /*
237 * attributes exported through sysfs
238 */
239 static ssize_t bmCapabilities_show
240 (struct device *dev, struct device_attribute *attr, char *buf)
241 {
242 struct usb_interface *intf = to_usb_interface(dev);
243 struct acm *acm = usb_get_intfdata(intf);
244
245 return sprintf(buf, "%d", acm->ctrl_caps);
246 }
247 static DEVICE_ATTR_RO(bmCapabilities);
248
249 static ssize_t wCountryCodes_show
250 (struct device *dev, struct device_attribute *attr, char *buf)
251 {
252 struct usb_interface *intf = to_usb_interface(dev);
253 struct acm *acm = usb_get_intfdata(intf);
254
255 memcpy(buf, acm->country_codes, acm->country_code_size);
256 return acm->country_code_size;
257 }
258
259 static DEVICE_ATTR_RO(wCountryCodes);
260
261 static ssize_t iCountryCodeRelDate_show
262 (struct device *dev, struct device_attribute *attr, char *buf)
263 {
264 struct usb_interface *intf = to_usb_interface(dev);
265 struct acm *acm = usb_get_intfdata(intf);
266
267 return sprintf(buf, "%d", acm->country_rel_date);
268 }
269
270 static DEVICE_ATTR_RO(iCountryCodeRelDate);
271 /*
272 * Interrupt handlers for various ACM device responses
273 */
274
275 static void acm_process_notification(struct acm *acm, unsigned char *buf)
276 {
277 int newctrl;
278 int difference;
279 unsigned long flags;
280 struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
281 unsigned char *data = buf + sizeof(struct usb_cdc_notification);
282
283 switch (dr->bNotificationType) {
284 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
285 dev_dbg(&acm->control->dev,
286 "%s - network connection: %d\n", __func__, dr->wValue);
287 break;
288
289 case USB_CDC_NOTIFY_SERIAL_STATE:
290 if (le16_to_cpu(dr->wLength) != 2) {
291 dev_dbg(&acm->control->dev,
292 "%s - malformed serial state\n", __func__);
293 break;
294 }
295
296 newctrl = get_unaligned_le16(data);
297 dev_dbg(&acm->control->dev,
298 "%s - serial state: 0x%x\n", __func__, newctrl);
299
300 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
301 dev_dbg(&acm->control->dev,
302 "%s - calling hangup\n", __func__);
303 tty_port_tty_hangup(&acm->port, false);
304 }
305
306 difference = acm->ctrlin ^ newctrl;
307 spin_lock_irqsave(&acm->read_lock, flags);
308 acm->ctrlin = newctrl;
309 acm->oldcount = acm->iocount;
310
311 if (difference & ACM_CTRL_DSR)
312 acm->iocount.dsr++;
313 if (difference & ACM_CTRL_DCD)
314 acm->iocount.dcd++;
315 if (newctrl & ACM_CTRL_BRK)
316 acm->iocount.brk++;
317 if (newctrl & ACM_CTRL_RI)
318 acm->iocount.rng++;
319 if (newctrl & ACM_CTRL_FRAMING)
320 acm->iocount.frame++;
321 if (newctrl & ACM_CTRL_PARITY)
322 acm->iocount.parity++;
323 if (newctrl & ACM_CTRL_OVERRUN)
324 acm->iocount.overrun++;
325 spin_unlock_irqrestore(&acm->read_lock, flags);
326
327 if (difference)
328 wake_up_all(&acm->wioctl);
329
330 break;
331
332 default:
333 dev_dbg(&acm->control->dev,
334 "%s - unknown notification %d received: index %d len %d\n",
335 __func__,
336 dr->bNotificationType, dr->wIndex, dr->wLength);
337 }
338 }
339
340 /* control interface reports status changes with "interrupt" transfers */
341 static void acm_ctrl_irq(struct urb *urb)
342 {
343 struct acm *acm = urb->context;
344 struct usb_cdc_notification *dr = urb->transfer_buffer;
345 unsigned int current_size = urb->actual_length;
346 unsigned int expected_size, copy_size, alloc_size;
347 int retval;
348 int status = urb->status;
349
350 switch (status) {
351 case 0:
352 /* success */
353 break;
354 case -ECONNRESET:
355 case -ENOENT:
356 case -ESHUTDOWN:
357 /* this urb is terminated, clean up */
358 dev_dbg(&acm->control->dev,
359 "%s - urb shutting down with status: %d\n",
360 __func__, status);
361 return;
362 default:
363 dev_dbg(&acm->control->dev,
364 "%s - nonzero urb status received: %d\n",
365 __func__, status);
366 goto exit;
367 }
368
369 usb_mark_last_busy(acm->dev);
370
371 if (acm->nb_index)
372 dr = (struct usb_cdc_notification *)acm->notification_buffer;
373
374 /* size = notification-header + (optional) data */
375 expected_size = sizeof(struct usb_cdc_notification) +
376 le16_to_cpu(dr->wLength);
377
378 if (current_size < expected_size) {
379 /* notification is transmitted fragmented, reassemble */
380 if (acm->nb_size < expected_size) {
381 if (acm->nb_size) {
382 kfree(acm->notification_buffer);
383 acm->nb_size = 0;
384 }
385 alloc_size = roundup_pow_of_two(expected_size);
386 /*
387 * kmalloc ensures a valid notification_buffer after a
388 * use of kfree in case the previous allocation was too
389 * small. Final freeing is done on disconnect.
390 */
391 acm->notification_buffer =
392 kmalloc(alloc_size, GFP_ATOMIC);
393 if (!acm->notification_buffer)
394 goto exit;
395 acm->nb_size = alloc_size;
396 }
397
398 copy_size = min(current_size,
399 expected_size - acm->nb_index);
400
401 memcpy(&acm->notification_buffer[acm->nb_index],
402 urb->transfer_buffer, copy_size);
403 acm->nb_index += copy_size;
404 current_size = acm->nb_index;
405 }
406
407 if (current_size >= expected_size) {
408 /* notification complete */
409 acm_process_notification(acm, (unsigned char *)dr);
410 acm->nb_index = 0;
411 }
412
413 exit:
414 retval = usb_submit_urb(urb, GFP_ATOMIC);
415 if (retval && retval != -EPERM)
416 dev_err(&acm->control->dev,
417 "%s - usb_submit_urb failed: %d\n", __func__, retval);
418 }
419
420 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
421 {
422 int res;
423
424 if (!test_and_clear_bit(index, &acm->read_urbs_free))
425 return 0;
426
427 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
428 if (res) {
429 if (res != -EPERM && res != -ENODEV) {
430 dev_err(&acm->data->dev,
431 "urb %d failed submission with %d\n",
432 index, res);
433 }
434 set_bit(index, &acm->read_urbs_free);
435 return res;
436 } else {
437 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
438 }
439
440 return 0;
441 }
442
443 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
444 {
445 int res;
446 int i;
447
448 for (i = 0; i < acm->rx_buflimit; ++i) {
449 res = acm_submit_read_urb(acm, i, mem_flags);
450 if (res)
451 return res;
452 }
453
454 return 0;
455 }
456
457 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
458 {
459 if (!urb->actual_length)
460 return;
461
462 tty_insert_flip_string(&acm->port, urb->transfer_buffer,
463 urb->actual_length);
464 tty_flip_buffer_push(&acm->port);
465 }
466
467 static void acm_read_bulk_callback(struct urb *urb)
468 {
469 struct acm_rb *rb = urb->context;
470 struct acm *acm = rb->instance;
471 unsigned long flags;
472 int status = urb->status;
473 bool stopped = false;
474 bool stalled = false;
475
476 dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
477 rb->index, urb->actual_length, status);
478
479 if (!acm->dev) {
480 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
481 return;
482 }
483
484 switch (status) {
485 case 0:
486 usb_mark_last_busy(acm->dev);
487 acm_process_read_urb(acm, urb);
488 break;
489 case -EPIPE:
490 set_bit(EVENT_RX_STALL, &acm->flags);
491 stalled = true;
492 break;
493 case -ENOENT:
494 case -ECONNRESET:
495 case -ESHUTDOWN:
496 dev_dbg(&acm->data->dev,
497 "%s - urb shutting down with status: %d\n",
498 __func__, status);
499 stopped = true;
500 break;
501 default:
502 dev_dbg(&acm->data->dev,
503 "%s - nonzero urb status received: %d\n",
504 __func__, status);
505 break;
506 }
507
508 /*
509 * Make sure URB processing is done before marking as free to avoid
510 * racing with unthrottle() on another CPU. Matches the barriers
511 * implied by the test_and_clear_bit() in acm_submit_read_urb().
512 */
513 smp_mb__before_atomic();
514 set_bit(rb->index, &acm->read_urbs_free);
515 /*
516 * Make sure URB is marked as free before checking the throttled flag
517 * to avoid racing with unthrottle() on another CPU. Matches the
518 * smp_mb() in unthrottle().
519 */
520 smp_mb__after_atomic();
521
522 if (stopped || stalled) {
523 if (stalled)
524 schedule_work(&acm->work);
525 return;
526 }
527
528 /* throttle device if requested by tty */
529 spin_lock_irqsave(&acm->read_lock, flags);
530 acm->throttled = acm->throttle_req;
531 if (!acm->throttled) {
532 spin_unlock_irqrestore(&acm->read_lock, flags);
533 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
534 } else {
535 spin_unlock_irqrestore(&acm->read_lock, flags);
536 }
537 }
538
539 /* data interface wrote those outgoing bytes */
540 static void acm_write_bulk(struct urb *urb)
541 {
542 struct acm_wb *wb = urb->context;
543 struct acm *acm = wb->instance;
544 unsigned long flags;
545 int status = urb->status;
546
547 if (status || (urb->actual_length != urb->transfer_buffer_length))
548 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
549 urb->actual_length,
550 urb->transfer_buffer_length,
551 status);
552
553 spin_lock_irqsave(&acm->write_lock, flags);
554 acm_write_done(acm, wb);
555 spin_unlock_irqrestore(&acm->write_lock, flags);
556 set_bit(EVENT_TTY_WAKEUP, &acm->flags);
557 schedule_work(&acm->work);
558 }
559
560 static void acm_softint(struct work_struct *work)
561 {
562 int i;
563 struct acm *acm = container_of(work, struct acm, work);
564
565 if (test_bit(EVENT_RX_STALL, &acm->flags)) {
566 if (!(usb_autopm_get_interface(acm->data))) {
567 for (i = 0; i < acm->rx_buflimit; i++)
568 usb_kill_urb(acm->read_urbs[i]);
569 usb_clear_halt(acm->dev, acm->in);
570 acm_submit_read_urbs(acm, GFP_KERNEL);
571 usb_autopm_put_interface(acm->data);
572 }
573 clear_bit(EVENT_RX_STALL, &acm->flags);
574 }
575
576 if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
577 tty_port_tty_wakeup(&acm->port);
578 }
579
580 /*
581 * TTY handlers
582 */
583
584 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
585 {
586 struct acm *acm;
587 int retval;
588
589 acm = acm_get_by_minor(tty->index);
590 if (!acm)
591 return -ENODEV;
592
593 retval = tty_standard_install(driver, tty);
594 if (retval)
595 goto error_init_termios;
596
597 /*
598 * Suppress initial echoing for some devices which might send data
599 * immediately after acm driver has been installed.
600 */
601 if (acm->quirks & DISABLE_ECHO)
602 tty->termios.c_lflag &= ~ECHO;
603
604 tty->driver_data = acm;
605
606 return 0;
607
608 error_init_termios:
609 tty_port_put(&acm->port);
610 return retval;
611 }
612
613 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
614 {
615 struct acm *acm = tty->driver_data;
616
617 return tty_port_open(&acm->port, tty, filp);
618 }
619
620 static void acm_port_dtr_rts(struct tty_port *port, int raise)
621 {
622 struct acm *acm = container_of(port, struct acm, port);
623 int val;
624 int res;
625
626 if (raise)
627 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
628 else
629 val = 0;
630
631 /* FIXME: add missing ctrlout locking throughout driver */
632 acm->ctrlout = val;
633
634 res = acm_set_control(acm, val);
635 if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
636 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
637 }
638
639 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
640 {
641 struct acm *acm = container_of(port, struct acm, port);
642 int retval = -ENODEV;
643 int i;
644
645 mutex_lock(&acm->mutex);
646 if (acm->disconnected)
647 goto disconnected;
648
649 retval = usb_autopm_get_interface(acm->control);
650 if (retval)
651 goto error_get_interface;
652
653 /*
654 * FIXME: Why do we need this? Allocating 64K of physically contiguous
655 * memory is really nasty...
656 */
657 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
658 acm->control->needs_remote_wakeup = 1;
659
660 acm->ctrlurb->dev = acm->dev;
661 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
662 if (retval) {
663 dev_err(&acm->control->dev,
664 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
665 goto error_submit_urb;
666 }
667
668 acm_tty_set_termios(tty, NULL);
669
670 /*
671 * Unthrottle device in case the TTY was closed while throttled.
672 */
673 spin_lock_irq(&acm->read_lock);
674 acm->throttled = 0;
675 acm->throttle_req = 0;
676 spin_unlock_irq(&acm->read_lock);
677
678 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
679 if (retval)
680 goto error_submit_read_urbs;
681
682 usb_autopm_put_interface(acm->control);
683
684 mutex_unlock(&acm->mutex);
685
686 return 0;
687
688 error_submit_read_urbs:
689 for (i = 0; i < acm->rx_buflimit; i++)
690 usb_kill_urb(acm->read_urbs[i]);
691 usb_kill_urb(acm->ctrlurb);
692 error_submit_urb:
693 usb_autopm_put_interface(acm->control);
694 error_get_interface:
695 disconnected:
696 mutex_unlock(&acm->mutex);
697
698 return usb_translate_errors(retval);
699 }
700
701 static void acm_port_destruct(struct tty_port *port)
702 {
703 struct acm *acm = container_of(port, struct acm, port);
704
705 acm_release_minor(acm);
706 usb_put_intf(acm->control);
707 kfree(acm->country_codes);
708 kfree(acm);
709 }
710
711 static void acm_port_shutdown(struct tty_port *port)
712 {
713 struct acm *acm = container_of(port, struct acm, port);
714 struct urb *urb;
715 struct acm_wb *wb;
716
717 /*
718 * Need to grab write_lock to prevent race with resume, but no need to
719 * hold it due to the tty-port initialised flag.
720 */
721 spin_lock_irq(&acm->write_lock);
722 spin_unlock_irq(&acm->write_lock);
723
724 usb_autopm_get_interface_no_resume(acm->control);
725 acm->control->needs_remote_wakeup = 0;
726 usb_autopm_put_interface(acm->control);
727
728 for (;;) {
729 urb = usb_get_from_anchor(&acm->delayed);
730 if (!urb)
731 break;
732 wb = urb->context;
733 wb->use = 0;
734 usb_autopm_put_interface_async(acm->control);
735 }
736
737 acm_kill_urbs(acm);
738 }
739
740 static void acm_tty_cleanup(struct tty_struct *tty)
741 {
742 struct acm *acm = tty->driver_data;
743
744 tty_port_put(&acm->port);
745 }
746
747 static void acm_tty_hangup(struct tty_struct *tty)
748 {
749 struct acm *acm = tty->driver_data;
750
751 tty_port_hangup(&acm->port);
752 }
753
754 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
755 {
756 struct acm *acm = tty->driver_data;
757
758 tty_port_close(&acm->port, tty, filp);
759 }
760
761 static int acm_tty_write(struct tty_struct *tty,
762 const unsigned char *buf, int count)
763 {
764 struct acm *acm = tty->driver_data;
765 int stat;
766 unsigned long flags;
767 int wbn;
768 struct acm_wb *wb;
769
770 if (!count)
771 return 0;
772
773 dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
774
775 spin_lock_irqsave(&acm->write_lock, flags);
776 wbn = acm_wb_alloc(acm);
777 if (wbn < 0) {
778 spin_unlock_irqrestore(&acm->write_lock, flags);
779 return 0;
780 }
781 wb = &acm->wb[wbn];
782
783 if (!acm->dev) {
784 wb->use = 0;
785 spin_unlock_irqrestore(&acm->write_lock, flags);
786 return -ENODEV;
787 }
788
789 count = (count > acm->writesize) ? acm->writesize : count;
790 dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
791 memcpy(wb->buf, buf, count);
792 wb->len = count;
793
794 stat = usb_autopm_get_interface_async(acm->control);
795 if (stat) {
796 wb->use = 0;
797 spin_unlock_irqrestore(&acm->write_lock, flags);
798 return stat;
799 }
800
801 if (acm->susp_count) {
802 usb_anchor_urb(wb->urb, &acm->delayed);
803 spin_unlock_irqrestore(&acm->write_lock, flags);
804 return count;
805 }
806
807 stat = acm_start_wb(acm, wb);
808 spin_unlock_irqrestore(&acm->write_lock, flags);
809
810 if (stat < 0)
811 return stat;
812 return count;
813 }
814
815 static int acm_tty_write_room(struct tty_struct *tty)
816 {
817 struct acm *acm = tty->driver_data;
818 /*
819 * Do not let the line discipline to know that we have a reserve,
820 * or it might get too enthusiastic.
821 */
822 return acm_wb_is_avail(acm) ? acm->writesize : 0;
823 }
824
825 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
826 {
827 struct acm *acm = tty->driver_data;
828 /*
829 * if the device was unplugged then any remaining characters fell out
830 * of the connector ;)
831 */
832 if (acm->disconnected)
833 return 0;
834 /*
835 * This is inaccurate (overcounts), but it works.
836 */
837 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
838 }
839
840 static void acm_tty_throttle(struct tty_struct *tty)
841 {
842 struct acm *acm = tty->driver_data;
843
844 spin_lock_irq(&acm->read_lock);
845 acm->throttle_req = 1;
846 spin_unlock_irq(&acm->read_lock);
847 }
848
849 static void acm_tty_unthrottle(struct tty_struct *tty)
850 {
851 struct acm *acm = tty->driver_data;
852 unsigned int was_throttled;
853
854 spin_lock_irq(&acm->read_lock);
855 was_throttled = acm->throttled;
856 acm->throttled = 0;
857 acm->throttle_req = 0;
858 spin_unlock_irq(&acm->read_lock);
859
860 /* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
861 smp_mb();
862
863 if (was_throttled)
864 acm_submit_read_urbs(acm, GFP_KERNEL);
865 }
866
867 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
868 {
869 struct acm *acm = tty->driver_data;
870 int retval;
871
872 retval = acm_send_break(acm, state ? 0xffff : 0);
873 if (retval < 0)
874 dev_dbg(&acm->control->dev,
875 "%s - send break failed\n", __func__);
876 return retval;
877 }
878
879 static int acm_tty_tiocmget(struct tty_struct *tty)
880 {
881 struct acm *acm = tty->driver_data;
882
883 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
884 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
885 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
886 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
887 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
888 TIOCM_CTS;
889 }
890
891 static int acm_tty_tiocmset(struct tty_struct *tty,
892 unsigned int set, unsigned int clear)
893 {
894 struct acm *acm = tty->driver_data;
895 unsigned int newctrl;
896
897 newctrl = acm->ctrlout;
898 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
899 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
900 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
901 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
902
903 newctrl = (newctrl & ~clear) | set;
904
905 if (acm->ctrlout == newctrl)
906 return 0;
907 return acm_set_control(acm, acm->ctrlout = newctrl);
908 }
909
910 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
911 {
912 struct acm *acm = tty->driver_data;
913
914 ss->xmit_fifo_size = acm->writesize;
915 ss->baud_base = le32_to_cpu(acm->line.dwDTERate);
916 ss->close_delay = acm->port.close_delay / 10;
917 ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
918 ASYNC_CLOSING_WAIT_NONE :
919 acm->port.closing_wait / 10;
920 return 0;
921 }
922
923 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
924 {
925 struct acm *acm = tty->driver_data;
926 unsigned int closing_wait, close_delay;
927 int retval = 0;
928
929 close_delay = ss->close_delay * 10;
930 closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
931 ASYNC_CLOSING_WAIT_NONE : ss->closing_wait * 10;
932
933 mutex_lock(&acm->port.mutex);
934
935 if (!capable(CAP_SYS_ADMIN)) {
936 if ((close_delay != acm->port.close_delay) ||
937 (closing_wait != acm->port.closing_wait))
938 retval = -EPERM;
939 else
940 retval = -EOPNOTSUPP;
941 } else {
942 acm->port.close_delay = close_delay;
943 acm->port.closing_wait = closing_wait;
944 }
945
946 mutex_unlock(&acm->port.mutex);
947 return retval;
948 }
949
950 static int wait_serial_change(struct acm *acm, unsigned long arg)
951 {
952 int rv = 0;
953 DECLARE_WAITQUEUE(wait, current);
954 struct async_icount old, new;
955
956 do {
957 spin_lock_irq(&acm->read_lock);
958 old = acm->oldcount;
959 new = acm->iocount;
960 acm->oldcount = new;
961 spin_unlock_irq(&acm->read_lock);
962
963 if ((arg & TIOCM_DSR) &&
964 old.dsr != new.dsr)
965 break;
966 if ((arg & TIOCM_CD) &&
967 old.dcd != new.dcd)
968 break;
969 if ((arg & TIOCM_RI) &&
970 old.rng != new.rng)
971 break;
972
973 add_wait_queue(&acm->wioctl, &wait);
974 set_current_state(TASK_INTERRUPTIBLE);
975 schedule();
976 remove_wait_queue(&acm->wioctl, &wait);
977 if (acm->disconnected) {
978 if (arg & TIOCM_CD)
979 break;
980 else
981 rv = -ENODEV;
982 } else {
983 if (signal_pending(current))
984 rv = -ERESTARTSYS;
985 }
986 } while (!rv);
987
988
989
990 return rv;
991 }
992
993 static int acm_tty_get_icount(struct tty_struct *tty,
994 struct serial_icounter_struct *icount)
995 {
996 struct acm *acm = tty->driver_data;
997
998 icount->dsr = acm->iocount.dsr;
999 icount->rng = acm->iocount.rng;
1000 icount->dcd = acm->iocount.dcd;
1001 icount->frame = acm->iocount.frame;
1002 icount->overrun = acm->iocount.overrun;
1003 icount->parity = acm->iocount.parity;
1004 icount->brk = acm->iocount.brk;
1005
1006 return 0;
1007 }
1008
1009 static int acm_tty_ioctl(struct tty_struct *tty,
1010 unsigned int cmd, unsigned long arg)
1011 {
1012 struct acm *acm = tty->driver_data;
1013 int rv = -ENOIOCTLCMD;
1014
1015 switch (cmd) {
1016 case TIOCMIWAIT:
1017 rv = usb_autopm_get_interface(acm->control);
1018 if (rv < 0) {
1019 rv = -EIO;
1020 break;
1021 }
1022 rv = wait_serial_change(acm, arg);
1023 usb_autopm_put_interface(acm->control);
1024 break;
1025 }
1026
1027 return rv;
1028 }
1029
1030 static void acm_tty_set_termios(struct tty_struct *tty,
1031 struct ktermios *termios_old)
1032 {
1033 struct acm *acm = tty->driver_data;
1034 struct ktermios *termios = &tty->termios;
1035 struct usb_cdc_line_coding newline;
1036 int newctrl = acm->ctrlout;
1037
1038 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1039 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1040 newline.bParityType = termios->c_cflag & PARENB ?
1041 (termios->c_cflag & PARODD ? 1 : 2) +
1042 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1043 switch (termios->c_cflag & CSIZE) {
1044 case CS5:
1045 newline.bDataBits = 5;
1046 break;
1047 case CS6:
1048 newline.bDataBits = 6;
1049 break;
1050 case CS7:
1051 newline.bDataBits = 7;
1052 break;
1053 case CS8:
1054 default:
1055 newline.bDataBits = 8;
1056 break;
1057 }
1058 /* FIXME: Needs to clear unsupported bits in the termios */
1059 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1060
1061 if (C_BAUD(tty) == B0) {
1062 newline.dwDTERate = acm->line.dwDTERate;
1063 newctrl &= ~ACM_CTRL_DTR;
1064 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1065 newctrl |= ACM_CTRL_DTR;
1066 }
1067
1068 if (newctrl != acm->ctrlout)
1069 acm_set_control(acm, acm->ctrlout = newctrl);
1070
1071 if (memcmp(&acm->line, &newline, sizeof newline)) {
1072 memcpy(&acm->line, &newline, sizeof newline);
1073 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1074 __func__,
1075 le32_to_cpu(newline.dwDTERate),
1076 newline.bCharFormat, newline.bParityType,
1077 newline.bDataBits);
1078 acm_set_line(acm, &acm->line);
1079 }
1080 }
1081
1082 static const struct tty_port_operations acm_port_ops = {
1083 .dtr_rts = acm_port_dtr_rts,
1084 .shutdown = acm_port_shutdown,
1085 .activate = acm_port_activate,
1086 .destruct = acm_port_destruct,
1087 };
1088
1089 /*
1090 * USB probe and disconnect routines.
1091 */
1092
1093 /* Little helpers: write/read buffers free */
1094 static void acm_write_buffers_free(struct acm *acm)
1095 {
1096 int i;
1097 struct acm_wb *wb;
1098
1099 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1100 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1101 }
1102
1103 static void acm_read_buffers_free(struct acm *acm)
1104 {
1105 int i;
1106
1107 for (i = 0; i < acm->rx_buflimit; i++)
1108 usb_free_coherent(acm->dev, acm->readsize,
1109 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1110 }
1111
1112 /* Little helper: write buffers allocate */
1113 static int acm_write_buffers_alloc(struct acm *acm)
1114 {
1115 int i;
1116 struct acm_wb *wb;
1117
1118 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1119 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1120 &wb->dmah);
1121 if (!wb->buf) {
1122 while (i != 0) {
1123 --i;
1124 --wb;
1125 usb_free_coherent(acm->dev, acm->writesize,
1126 wb->buf, wb->dmah);
1127 }
1128 return -ENOMEM;
1129 }
1130 }
1131 return 0;
1132 }
1133
1134 static int acm_probe(struct usb_interface *intf,
1135 const struct usb_device_id *id)
1136 {
1137 struct usb_cdc_union_desc *union_header = NULL;
1138 struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1139 unsigned char *buffer = intf->altsetting->extra;
1140 int buflen = intf->altsetting->extralen;
1141 struct usb_interface *control_interface;
1142 struct usb_interface *data_interface;
1143 struct usb_endpoint_descriptor *epctrl = NULL;
1144 struct usb_endpoint_descriptor *epread = NULL;
1145 struct usb_endpoint_descriptor *epwrite = NULL;
1146 struct usb_device *usb_dev = interface_to_usbdev(intf);
1147 struct usb_cdc_parsed_header h;
1148 struct acm *acm;
1149 int minor;
1150 int ctrlsize, readsize;
1151 u8 *buf;
1152 int call_intf_num = -1;
1153 int data_intf_num = -1;
1154 unsigned long quirks;
1155 int num_rx_buf;
1156 int i;
1157 int combined_interfaces = 0;
1158 struct device *tty_dev;
1159 int rv = -ENOMEM;
1160 int res;
1161
1162 /* normal quirks */
1163 quirks = (unsigned long)id->driver_info;
1164
1165 if (quirks == IGNORE_DEVICE)
1166 return -ENODEV;
1167
1168 memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1169
1170 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1171
1172 /* handle quirks deadly to normal probing*/
1173 if (quirks == NO_UNION_NORMAL) {
1174 data_interface = usb_ifnum_to_if(usb_dev, 1);
1175 control_interface = usb_ifnum_to_if(usb_dev, 0);
1176 /* we would crash */
1177 if (!data_interface || !control_interface)
1178 return -ENODEV;
1179 goto skip_normal_probe;
1180 }
1181
1182 /* normal probing*/
1183 if (!buffer) {
1184 dev_err(&intf->dev, "Weird descriptor references\n");
1185 return -EINVAL;
1186 }
1187
1188 if (!intf->cur_altsetting)
1189 return -EINVAL;
1190
1191 if (!buflen) {
1192 if (intf->cur_altsetting->endpoint &&
1193 intf->cur_altsetting->endpoint->extralen &&
1194 intf->cur_altsetting->endpoint->extra) {
1195 dev_dbg(&intf->dev,
1196 "Seeking extra descriptors on endpoint\n");
1197 buflen = intf->cur_altsetting->endpoint->extralen;
1198 buffer = intf->cur_altsetting->endpoint->extra;
1199 } else {
1200 dev_err(&intf->dev,
1201 "Zero length descriptor references\n");
1202 return -EINVAL;
1203 }
1204 }
1205
1206 cdc_parse_cdc_header(&h, intf, buffer, buflen);
1207 union_header = h.usb_cdc_union_desc;
1208 cmgmd = h.usb_cdc_call_mgmt_descriptor;
1209 if (cmgmd)
1210 call_intf_num = cmgmd->bDataInterface;
1211
1212 if (!union_header) {
1213 if (call_intf_num > 0) {
1214 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1215 /* quirks for Droids MuIn LCD */
1216 if (quirks & NO_DATA_INTERFACE) {
1217 data_interface = usb_ifnum_to_if(usb_dev, 0);
1218 } else {
1219 data_intf_num = call_intf_num;
1220 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1221 }
1222 control_interface = intf;
1223 } else {
1224 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1225 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1226 return -ENODEV;
1227 } else {
1228 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1229 combined_interfaces = 1;
1230 control_interface = data_interface = intf;
1231 goto look_for_collapsed_interface;
1232 }
1233 }
1234 } else {
1235 data_intf_num = union_header->bSlaveInterface0;
1236 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1237 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1238 }
1239
1240 if (!control_interface || !data_interface) {
1241 dev_dbg(&intf->dev, "no interfaces\n");
1242 return -ENODEV;
1243 }
1244 if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1245 return -ENODEV;
1246
1247 if (data_intf_num != call_intf_num)
1248 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1249
1250 if (control_interface == data_interface) {
1251 /* some broken devices designed for windows work this way */
1252 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1253 combined_interfaces = 1;
1254 /* a popular other OS doesn't use it */
1255 quirks |= NO_CAP_LINE;
1256 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1257 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1258 return -EINVAL;
1259 }
1260 look_for_collapsed_interface:
1261 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1262 &epread, &epwrite, &epctrl, NULL);
1263 if (res)
1264 return res;
1265
1266 goto made_compressed_probe;
1267 }
1268
1269 skip_normal_probe:
1270
1271 /*workaround for switched interfaces */
1272 if (data_interface->cur_altsetting->desc.bInterfaceClass
1273 != CDC_DATA_INTERFACE_TYPE) {
1274 if (control_interface->cur_altsetting->desc.bInterfaceClass
1275 == CDC_DATA_INTERFACE_TYPE) {
1276 dev_dbg(&intf->dev,
1277 "Your device has switched interfaces.\n");
1278 swap(control_interface, data_interface);
1279 } else {
1280 return -EINVAL;
1281 }
1282 }
1283
1284 /* Accept probe requests only for the control interface */
1285 if (!combined_interfaces && intf != control_interface)
1286 return -ENODEV;
1287
1288 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1289 /* valid in this context */
1290 dev_dbg(&intf->dev, "The data interface isn't available\n");
1291 return -EBUSY;
1292 }
1293
1294
1295 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1296 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1297 return -EINVAL;
1298
1299 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1300 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1301 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1302
1303
1304 /* workaround for switched endpoints */
1305 if (!usb_endpoint_dir_in(epread)) {
1306 /* descriptors are swapped */
1307 dev_dbg(&intf->dev,
1308 "The data interface has switched endpoints\n");
1309 swap(epread, epwrite);
1310 }
1311 made_compressed_probe:
1312 dev_dbg(&intf->dev, "interfaces are valid\n");
1313
1314 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1315 if (acm == NULL)
1316 goto alloc_fail;
1317
1318 tty_port_init(&acm->port);
1319 acm->port.ops = &acm_port_ops;
1320
1321 minor = acm_alloc_minor(acm);
1322 if (minor < 0)
1323 goto alloc_fail1;
1324
1325 ctrlsize = usb_endpoint_maxp(epctrl);
1326 readsize = usb_endpoint_maxp(epread) *
1327 (quirks == SINGLE_RX_URB ? 1 : 2);
1328 acm->combined_interfaces = combined_interfaces;
1329 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1330 acm->control = control_interface;
1331 acm->data = data_interface;
1332 acm->minor = minor;
1333 acm->dev = usb_dev;
1334 if (h.usb_cdc_acm_descriptor)
1335 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1336 if (quirks & NO_CAP_LINE)
1337 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1338 acm->ctrlsize = ctrlsize;
1339 acm->readsize = readsize;
1340 acm->rx_buflimit = num_rx_buf;
1341 INIT_WORK(&acm->work, acm_softint);
1342 init_waitqueue_head(&acm->wioctl);
1343 spin_lock_init(&acm->write_lock);
1344 spin_lock_init(&acm->read_lock);
1345 mutex_init(&acm->mutex);
1346 if (usb_endpoint_xfer_int(epread)) {
1347 acm->bInterval = epread->bInterval;
1348 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1349 } else {
1350 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1351 }
1352 if (usb_endpoint_xfer_int(epwrite))
1353 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1354 else
1355 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1356 init_usb_anchor(&acm->delayed);
1357 acm->quirks = quirks;
1358
1359 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1360 if (!buf)
1361 goto alloc_fail1;
1362 acm->ctrl_buffer = buf;
1363
1364 if (acm_write_buffers_alloc(acm) < 0)
1365 goto alloc_fail2;
1366
1367 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1368 if (!acm->ctrlurb)
1369 goto alloc_fail3;
1370
1371 for (i = 0; i < num_rx_buf; i++) {
1372 struct acm_rb *rb = &(acm->read_buffers[i]);
1373 struct urb *urb;
1374
1375 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1376 &rb->dma);
1377 if (!rb->base)
1378 goto alloc_fail4;
1379 rb->index = i;
1380 rb->instance = acm;
1381
1382 urb = usb_alloc_urb(0, GFP_KERNEL);
1383 if (!urb)
1384 goto alloc_fail4;
1385
1386 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1387 urb->transfer_dma = rb->dma;
1388 if (usb_endpoint_xfer_int(epread))
1389 usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1390 acm->readsize,
1391 acm_read_bulk_callback, rb,
1392 acm->bInterval);
1393 else
1394 usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1395 acm->readsize,
1396 acm_read_bulk_callback, rb);
1397
1398 acm->read_urbs[i] = urb;
1399 __set_bit(i, &acm->read_urbs_free);
1400 }
1401 for (i = 0; i < ACM_NW; i++) {
1402 struct acm_wb *snd = &(acm->wb[i]);
1403
1404 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1405 if (snd->urb == NULL)
1406 goto alloc_fail5;
1407
1408 if (usb_endpoint_xfer_int(epwrite))
1409 usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1410 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1411 else
1412 usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1413 NULL, acm->writesize, acm_write_bulk, snd);
1414 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1415 if (quirks & SEND_ZERO_PACKET)
1416 snd->urb->transfer_flags |= URB_ZERO_PACKET;
1417 snd->instance = acm;
1418 }
1419
1420 usb_set_intfdata(intf, acm);
1421
1422 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1423 if (i < 0)
1424 goto alloc_fail5;
1425
1426 if (h.usb_cdc_country_functional_desc) { /* export the country data */
1427 struct usb_cdc_country_functional_desc * cfd =
1428 h.usb_cdc_country_functional_desc;
1429
1430 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1431 if (!acm->country_codes)
1432 goto skip_countries;
1433 acm->country_code_size = cfd->bLength - 4;
1434 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1435 cfd->bLength - 4);
1436 acm->country_rel_date = cfd->iCountryCodeRelDate;
1437
1438 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1439 if (i < 0) {
1440 kfree(acm->country_codes);
1441 acm->country_codes = NULL;
1442 acm->country_code_size = 0;
1443 goto skip_countries;
1444 }
1445
1446 i = device_create_file(&intf->dev,
1447 &dev_attr_iCountryCodeRelDate);
1448 if (i < 0) {
1449 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1450 kfree(acm->country_codes);
1451 acm->country_codes = NULL;
1452 acm->country_code_size = 0;
1453 goto skip_countries;
1454 }
1455 }
1456
1457 skip_countries:
1458 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1459 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1460 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1461 /* works around buggy devices */
1462 epctrl->bInterval ? epctrl->bInterval : 16);
1463 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1464 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1465 acm->notification_buffer = NULL;
1466 acm->nb_index = 0;
1467 acm->nb_size = 0;
1468
1469 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1470
1471 acm->line.dwDTERate = cpu_to_le32(9600);
1472 acm->line.bDataBits = 8;
1473 acm_set_line(acm, &acm->line);
1474
1475 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1476 usb_set_intfdata(data_interface, acm);
1477
1478 usb_get_intf(control_interface);
1479 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1480 &control_interface->dev);
1481 if (IS_ERR(tty_dev)) {
1482 rv = PTR_ERR(tty_dev);
1483 goto alloc_fail6;
1484 }
1485
1486 if (quirks & CLEAR_HALT_CONDITIONS) {
1487 usb_clear_halt(usb_dev, acm->in);
1488 usb_clear_halt(usb_dev, acm->out);
1489 }
1490
1491 return 0;
1492 alloc_fail6:
1493 if (acm->country_codes) {
1494 device_remove_file(&acm->control->dev,
1495 &dev_attr_wCountryCodes);
1496 device_remove_file(&acm->control->dev,
1497 &dev_attr_iCountryCodeRelDate);
1498 kfree(acm->country_codes);
1499 }
1500 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1501 alloc_fail5:
1502 usb_set_intfdata(intf, NULL);
1503 for (i = 0; i < ACM_NW; i++)
1504 usb_free_urb(acm->wb[i].urb);
1505 alloc_fail4:
1506 for (i = 0; i < num_rx_buf; i++)
1507 usb_free_urb(acm->read_urbs[i]);
1508 acm_read_buffers_free(acm);
1509 usb_free_urb(acm->ctrlurb);
1510 alloc_fail3:
1511 acm_write_buffers_free(acm);
1512 alloc_fail2:
1513 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1514 alloc_fail1:
1515 tty_port_put(&acm->port);
1516 alloc_fail:
1517 return rv;
1518 }
1519
1520 static void acm_disconnect(struct usb_interface *intf)
1521 {
1522 struct acm *acm = usb_get_intfdata(intf);
1523 struct tty_struct *tty;
1524 int i;
1525
1526 /* sibling interface is already cleaning up */
1527 if (!acm)
1528 return;
1529
1530 mutex_lock(&acm->mutex);
1531 acm->disconnected = true;
1532 if (acm->country_codes) {
1533 device_remove_file(&acm->control->dev,
1534 &dev_attr_wCountryCodes);
1535 device_remove_file(&acm->control->dev,
1536 &dev_attr_iCountryCodeRelDate);
1537 }
1538 wake_up_all(&acm->wioctl);
1539 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1540 usb_set_intfdata(acm->control, NULL);
1541 usb_set_intfdata(acm->data, NULL);
1542 mutex_unlock(&acm->mutex);
1543
1544 tty = tty_port_tty_get(&acm->port);
1545 if (tty) {
1546 tty_vhangup(tty);
1547 tty_kref_put(tty);
1548 }
1549
1550 acm_kill_urbs(acm);
1551 cancel_work_sync(&acm->work);
1552
1553 tty_unregister_device(acm_tty_driver, acm->minor);
1554
1555 usb_free_urb(acm->ctrlurb);
1556 for (i = 0; i < ACM_NW; i++)
1557 usb_free_urb(acm->wb[i].urb);
1558 for (i = 0; i < acm->rx_buflimit; i++)
1559 usb_free_urb(acm->read_urbs[i]);
1560 acm_write_buffers_free(acm);
1561 usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1562 acm_read_buffers_free(acm);
1563
1564 kfree(acm->notification_buffer);
1565
1566 if (!acm->combined_interfaces)
1567 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1568 acm->data : acm->control);
1569
1570 tty_port_put(&acm->port);
1571 }
1572
1573 #ifdef CONFIG_PM
1574 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1575 {
1576 struct acm *acm = usb_get_intfdata(intf);
1577 int cnt;
1578
1579 spin_lock_irq(&acm->write_lock);
1580 if (PMSG_IS_AUTO(message)) {
1581 if (acm->transmitting) {
1582 spin_unlock_irq(&acm->write_lock);
1583 return -EBUSY;
1584 }
1585 }
1586 cnt = acm->susp_count++;
1587 spin_unlock_irq(&acm->write_lock);
1588
1589 if (cnt)
1590 return 0;
1591
1592 acm_kill_urbs(acm);
1593 cancel_work_sync(&acm->work);
1594
1595 return 0;
1596 }
1597
1598 static int acm_resume(struct usb_interface *intf)
1599 {
1600 struct acm *acm = usb_get_intfdata(intf);
1601 struct urb *urb;
1602 int rv = 0;
1603
1604 spin_lock_irq(&acm->write_lock);
1605
1606 if (--acm->susp_count)
1607 goto out;
1608
1609 if (tty_port_initialized(&acm->port)) {
1610 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1611
1612 for (;;) {
1613 urb = usb_get_from_anchor(&acm->delayed);
1614 if (!urb)
1615 break;
1616
1617 acm_start_wb(acm, urb->context);
1618 }
1619
1620 /*
1621 * delayed error checking because we must
1622 * do the write path at all cost
1623 */
1624 if (rv < 0)
1625 goto out;
1626
1627 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1628 }
1629 out:
1630 spin_unlock_irq(&acm->write_lock);
1631
1632 return rv;
1633 }
1634
1635 static int acm_reset_resume(struct usb_interface *intf)
1636 {
1637 struct acm *acm = usb_get_intfdata(intf);
1638
1639 if (tty_port_initialized(&acm->port))
1640 tty_port_tty_hangup(&acm->port, false);
1641
1642 return acm_resume(intf);
1643 }
1644
1645 #endif /* CONFIG_PM */
1646
1647 static int acm_pre_reset(struct usb_interface *intf)
1648 {
1649 struct acm *acm = usb_get_intfdata(intf);
1650
1651 clear_bit(EVENT_RX_STALL, &acm->flags);
1652 acm->nb_index = 0; /* pending control transfers are lost */
1653
1654 return 0;
1655 }
1656
1657 #define NOKIA_PCSUITE_ACM_INFO(x) \
1658 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1659 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1660 USB_CDC_ACM_PROTO_VENDOR)
1661
1662 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1663 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1664 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1665 USB_CDC_ACM_PROTO_VENDOR)
1666
1667 /*
1668 * USB driver structure.
1669 */
1670
1671 static const struct usb_device_id acm_ids[] = {
1672 /* quirky and broken devices */
1673 { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1674 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1675 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1676 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1677 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1678 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1679 },
1680 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1681 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1682 },
1683 { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1684 .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1685 },
1686 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1687 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1688 },
1689 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1690 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1691 },
1692 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1693 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1694 },
1695 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1696 .driver_info = SINGLE_RX_URB,
1697 },
1698 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1699 .driver_info = SINGLE_RX_URB, /* firmware bug */
1700 },
1701 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1702 .driver_info = SINGLE_RX_URB, /* firmware bug */
1703 },
1704 { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1705 .driver_info = SINGLE_RX_URB,
1706 },
1707 { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1708 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1709 },
1710 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1711 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1712 },
1713 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1714 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1715 },
1716 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1717 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1718 },
1719 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1720 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1721 },
1722 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1723 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1724 },
1725 { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1726 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1727 },
1728 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1729 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1730 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1731 { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1732 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1733 },
1734 /* Motorola H24 HSPA module: */
1735 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1736 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1737 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1738 },
1739 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1740 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1741 },
1742 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1743 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1744 },
1745 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1746 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1747 },
1748 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1749 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1750 },
1751 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1752 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1753 },
1754 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1755 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1756 },
1757
1758 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1759 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1760 data interface instead of
1761 communications interface.
1762 Maybe we should define a new
1763 quirk for this. */
1764 },
1765 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1766 .driver_info = NO_UNION_NORMAL,
1767 },
1768 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1769 .driver_info = NO_UNION_NORMAL,
1770 },
1771 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1772 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1773 },
1774 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1775 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1776 },
1777 { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1778 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1779 },
1780 { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1781 .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1782 },
1783 { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1784 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1785 },
1786
1787 { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1788 .driver_info = CLEAR_HALT_CONDITIONS,
1789 },
1790
1791 /* Nokia S60 phones expose two ACM channels. The first is
1792 * a modem and is picked up by the standard AT-command
1793 * information below. The second is 'vendor-specific' but
1794 * is treated as a serial device at the S60 end, so we want
1795 * to expose it on Linux too. */
1796 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1797 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1798 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1799 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1800 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1801 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1802 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1803 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1804 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1805 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1806 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1807 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1808 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1809 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1810 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1811 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1812 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1813 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1814 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1815 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1816 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1817 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1818 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1819 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1820 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1821 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1822 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1823 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1824 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1825 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1826 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1827 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1828 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1829 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1830 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1831 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1832 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1833 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1834 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1835 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1836 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1837 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1838 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1839 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1840 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1841 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1842 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1843 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1844 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1845 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1846 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1847 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1848 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1849 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1850 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1851 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1852 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1853 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1854
1855 /* Support for Owen devices */
1856 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1857
1858 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1859
1860 /* Support for Droids MuIn LCD */
1861 { USB_DEVICE(0x04d8, 0x000b),
1862 .driver_info = NO_DATA_INTERFACE,
1863 },
1864
1865 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1866 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1867 .driver_info = IGNORE_DEVICE,
1868 },
1869 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1870 .driver_info = IGNORE_DEVICE,
1871 },
1872 #endif
1873
1874 /*Samsung phone in firmware update mode */
1875 { USB_DEVICE(0x04e8, 0x685d),
1876 .driver_info = IGNORE_DEVICE,
1877 },
1878
1879 /* Exclude Infineon Flash Loader utility */
1880 { USB_DEVICE(0x058b, 0x0041),
1881 .driver_info = IGNORE_DEVICE,
1882 },
1883
1884 { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1885 .driver_info = SEND_ZERO_PACKET,
1886 },
1887 { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1888 .driver_info = SEND_ZERO_PACKET,
1889 },
1890
1891 /* control interfaces without any protocol set */
1892 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1893 USB_CDC_PROTO_NONE) },
1894
1895 /* control interfaces with various AT-command sets */
1896 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1897 USB_CDC_ACM_PROTO_AT_V25TER) },
1898 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1899 USB_CDC_ACM_PROTO_AT_PCCA101) },
1900 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1901 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1902 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1903 USB_CDC_ACM_PROTO_AT_GSM) },
1904 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1905 USB_CDC_ACM_PROTO_AT_3G) },
1906 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1907 USB_CDC_ACM_PROTO_AT_CDMA) },
1908
1909 { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1910 .driver_info = SEND_ZERO_PACKET,
1911 },
1912
1913 { }
1914 };
1915
1916 MODULE_DEVICE_TABLE(usb, acm_ids);
1917
1918 static struct usb_driver acm_driver = {
1919 .name = "cdc_acm",
1920 .probe = acm_probe,
1921 .disconnect = acm_disconnect,
1922 #ifdef CONFIG_PM
1923 .suspend = acm_suspend,
1924 .resume = acm_resume,
1925 .reset_resume = acm_reset_resume,
1926 #endif
1927 .pre_reset = acm_pre_reset,
1928 .id_table = acm_ids,
1929 #ifdef CONFIG_PM
1930 .supports_autosuspend = 1,
1931 #endif
1932 .disable_hub_initiated_lpm = 1,
1933 };
1934
1935 /*
1936 * TTY driver structures.
1937 */
1938
1939 static const struct tty_operations acm_ops = {
1940 .install = acm_tty_install,
1941 .open = acm_tty_open,
1942 .close = acm_tty_close,
1943 .cleanup = acm_tty_cleanup,
1944 .hangup = acm_tty_hangup,
1945 .write = acm_tty_write,
1946 .write_room = acm_tty_write_room,
1947 .ioctl = acm_tty_ioctl,
1948 .throttle = acm_tty_throttle,
1949 .unthrottle = acm_tty_unthrottle,
1950 .chars_in_buffer = acm_tty_chars_in_buffer,
1951 .break_ctl = acm_tty_break_ctl,
1952 .set_termios = acm_tty_set_termios,
1953 .tiocmget = acm_tty_tiocmget,
1954 .tiocmset = acm_tty_tiocmset,
1955 .get_serial = get_serial_info,
1956 .set_serial = set_serial_info,
1957 .get_icount = acm_tty_get_icount,
1958 };
1959
1960 /*
1961 * Init / exit.
1962 */
1963
1964 static int __init acm_init(void)
1965 {
1966 int retval;
1967 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1968 if (!acm_tty_driver)
1969 return -ENOMEM;
1970 acm_tty_driver->driver_name = "acm",
1971 acm_tty_driver->name = "ttyACM",
1972 acm_tty_driver->major = ACM_TTY_MAJOR,
1973 acm_tty_driver->minor_start = 0,
1974 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1975 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1976 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1977 acm_tty_driver->init_termios = tty_std_termios;
1978 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1979 HUPCL | CLOCAL;
1980 tty_set_operations(acm_tty_driver, &acm_ops);
1981
1982 retval = tty_register_driver(acm_tty_driver);
1983 if (retval) {
1984 put_tty_driver(acm_tty_driver);
1985 return retval;
1986 }
1987
1988 retval = usb_register(&acm_driver);
1989 if (retval) {
1990 tty_unregister_driver(acm_tty_driver);
1991 put_tty_driver(acm_tty_driver);
1992 return retval;
1993 }
1994
1995 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1996
1997 return 0;
1998 }
1999
2000 static void __exit acm_exit(void)
2001 {
2002 usb_deregister(&acm_driver);
2003 tty_unregister_driver(acm_tty_driver);
2004 put_tty_driver(acm_tty_driver);
2005 idr_destroy(&acm_minors);
2006 }
2007
2008 module_init(acm_init);
2009 module_exit(acm_exit);
2010
2011 MODULE_AUTHOR(DRIVER_AUTHOR);
2012 MODULE_DESCRIPTION(DRIVER_DESC);
2013 MODULE_LICENSE("GPL");
2014 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
Linux with added FPC-III support