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lkdtm: Add Control Flow Integrity test
[linux/fpc-iii.git] / drivers / usb / class / cdc-acm.c
blob183b41753c98298236ea0690cd119e231d1ae5f3
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 int status = urb->status;
472 bool stopped = false;
473 bool stalled = false;
474
475 dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
476 rb->index, urb->actual_length, status);
477
478 if (!acm->dev) {
479 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
480 return;
481 }
482
483 switch (status) {
484 case 0:
485 usb_mark_last_busy(acm->dev);
486 acm_process_read_urb(acm, urb);
487 break;
488 case -EPIPE:
489 set_bit(EVENT_RX_STALL, &acm->flags);
490 stalled = true;
491 break;
492 case -ENOENT:
493 case -ECONNRESET:
494 case -ESHUTDOWN:
495 dev_dbg(&acm->data->dev,
496 "%s - urb shutting down with status: %d\n",
497 __func__, status);
498 stopped = true;
499 break;
500 default:
501 dev_dbg(&acm->data->dev,
502 "%s - nonzero urb status received: %d\n",
503 __func__, status);
504 break;
505 }
506
507 /*
508 * Make sure URB processing is done before marking as free to avoid
509 * racing with unthrottle() on another CPU. Matches the barriers
510 * implied by the test_and_clear_bit() in acm_submit_read_urb().
511 */
512 smp_mb__before_atomic();
513 set_bit(rb->index, &acm->read_urbs_free);
514 /*
515 * Make sure URB is marked as free before checking the throttled flag
516 * to avoid racing with unthrottle() on another CPU. Matches the
517 * smp_mb() in unthrottle().
518 */
519 smp_mb__after_atomic();
520
521 if (stopped || stalled) {
522 if (stalled)
523 schedule_work(&acm->work);
524 return;
525 }
526
527 if (test_bit(ACM_THROTTLED, &acm->flags))
528 return;
529
530 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
531 }
532
533 /* data interface wrote those outgoing bytes */
534 static void acm_write_bulk(struct urb *urb)
535 {
536 struct acm_wb *wb = urb->context;
537 struct acm *acm = wb->instance;
538 unsigned long flags;
539 int status = urb->status;
540
541 if (status || (urb->actual_length != urb->transfer_buffer_length))
542 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
543 urb->actual_length,
544 urb->transfer_buffer_length,
545 status);
546
547 spin_lock_irqsave(&acm->write_lock, flags);
548 acm_write_done(acm, wb);
549 spin_unlock_irqrestore(&acm->write_lock, flags);
550 set_bit(EVENT_TTY_WAKEUP, &acm->flags);
551 schedule_work(&acm->work);
552 }
553
554 static void acm_softint(struct work_struct *work)
555 {
556 int i;
557 struct acm *acm = container_of(work, struct acm, work);
558
559 if (test_bit(EVENT_RX_STALL, &acm->flags)) {
560 if (!(usb_autopm_get_interface(acm->data))) {
561 for (i = 0; i < acm->rx_buflimit; i++)
562 usb_kill_urb(acm->read_urbs[i]);
563 usb_clear_halt(acm->dev, acm->in);
564 acm_submit_read_urbs(acm, GFP_KERNEL);
565 usb_autopm_put_interface(acm->data);
566 }
567 clear_bit(EVENT_RX_STALL, &acm->flags);
568 }
569
570 if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
571 tty_port_tty_wakeup(&acm->port);
572 }
573
574 /*
575 * TTY handlers
576 */
577
578 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
579 {
580 struct acm *acm;
581 int retval;
582
583 acm = acm_get_by_minor(tty->index);
584 if (!acm)
585 return -ENODEV;
586
587 retval = tty_standard_install(driver, tty);
588 if (retval)
589 goto error_init_termios;
590
591 /*
592 * Suppress initial echoing for some devices which might send data
593 * immediately after acm driver has been installed.
594 */
595 if (acm->quirks & DISABLE_ECHO)
596 tty->termios.c_lflag &= ~ECHO;
597
598 tty->driver_data = acm;
599
600 return 0;
601
602 error_init_termios:
603 tty_port_put(&acm->port);
604 return retval;
605 }
606
607 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
608 {
609 struct acm *acm = tty->driver_data;
610
611 return tty_port_open(&acm->port, tty, filp);
612 }
613
614 static void acm_port_dtr_rts(struct tty_port *port, int raise)
615 {
616 struct acm *acm = container_of(port, struct acm, port);
617 int val;
618 int res;
619
620 if (raise)
621 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
622 else
623 val = 0;
624
625 /* FIXME: add missing ctrlout locking throughout driver */
626 acm->ctrlout = val;
627
628 res = acm_set_control(acm, val);
629 if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
630 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
631 }
632
633 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
634 {
635 struct acm *acm = container_of(port, struct acm, port);
636 int retval = -ENODEV;
637 int i;
638
639 mutex_lock(&acm->mutex);
640 if (acm->disconnected)
641 goto disconnected;
642
643 retval = usb_autopm_get_interface(acm->control);
644 if (retval)
645 goto error_get_interface;
646
647 /*
648 * FIXME: Why do we need this? Allocating 64K of physically contiguous
649 * memory is really nasty...
650 */
651 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
652 acm->control->needs_remote_wakeup = 1;
653
654 acm->ctrlurb->dev = acm->dev;
655 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
656 if (retval) {
657 dev_err(&acm->control->dev,
658 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
659 goto error_submit_urb;
660 }
661
662 acm_tty_set_termios(tty, NULL);
663
664 /*
665 * Unthrottle device in case the TTY was closed while throttled.
666 */
667 clear_bit(ACM_THROTTLED, &acm->flags);
668
669 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
670 if (retval)
671 goto error_submit_read_urbs;
672
673 usb_autopm_put_interface(acm->control);
674
675 mutex_unlock(&acm->mutex);
676
677 return 0;
678
679 error_submit_read_urbs:
680 for (i = 0; i < acm->rx_buflimit; i++)
681 usb_kill_urb(acm->read_urbs[i]);
682 usb_kill_urb(acm->ctrlurb);
683 error_submit_urb:
684 usb_autopm_put_interface(acm->control);
685 error_get_interface:
686 disconnected:
687 mutex_unlock(&acm->mutex);
688
689 return usb_translate_errors(retval);
690 }
691
692 static void acm_port_destruct(struct tty_port *port)
693 {
694 struct acm *acm = container_of(port, struct acm, port);
695
696 acm_release_minor(acm);
697 usb_put_intf(acm->control);
698 kfree(acm->country_codes);
699 kfree(acm);
700 }
701
702 static void acm_port_shutdown(struct tty_port *port)
703 {
704 struct acm *acm = container_of(port, struct acm, port);
705 struct urb *urb;
706 struct acm_wb *wb;
707
708 /*
709 * Need to grab write_lock to prevent race with resume, but no need to
710 * hold it due to the tty-port initialised flag.
711 */
712 spin_lock_irq(&acm->write_lock);
713 spin_unlock_irq(&acm->write_lock);
714
715 usb_autopm_get_interface_no_resume(acm->control);
716 acm->control->needs_remote_wakeup = 0;
717 usb_autopm_put_interface(acm->control);
718
719 for (;;) {
720 urb = usb_get_from_anchor(&acm->delayed);
721 if (!urb)
722 break;
723 wb = urb->context;
724 wb->use = 0;
725 usb_autopm_put_interface_async(acm->control);
726 }
727
728 acm_kill_urbs(acm);
729 }
730
731 static void acm_tty_cleanup(struct tty_struct *tty)
732 {
733 struct acm *acm = tty->driver_data;
734
735 tty_port_put(&acm->port);
736 }
737
738 static void acm_tty_hangup(struct tty_struct *tty)
739 {
740 struct acm *acm = tty->driver_data;
741
742 tty_port_hangup(&acm->port);
743 }
744
745 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
746 {
747 struct acm *acm = tty->driver_data;
748
749 tty_port_close(&acm->port, tty, filp);
750 }
751
752 static int acm_tty_write(struct tty_struct *tty,
753 const unsigned char *buf, int count)
754 {
755 struct acm *acm = tty->driver_data;
756 int stat;
757 unsigned long flags;
758 int wbn;
759 struct acm_wb *wb;
760
761 if (!count)
762 return 0;
763
764 dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
765
766 spin_lock_irqsave(&acm->write_lock, flags);
767 wbn = acm_wb_alloc(acm);
768 if (wbn < 0) {
769 spin_unlock_irqrestore(&acm->write_lock, flags);
770 return 0;
771 }
772 wb = &acm->wb[wbn];
773
774 if (!acm->dev) {
775 wb->use = 0;
776 spin_unlock_irqrestore(&acm->write_lock, flags);
777 return -ENODEV;
778 }
779
780 count = (count > acm->writesize) ? acm->writesize : count;
781 dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
782 memcpy(wb->buf, buf, count);
783 wb->len = count;
784
785 stat = usb_autopm_get_interface_async(acm->control);
786 if (stat) {
787 wb->use = 0;
788 spin_unlock_irqrestore(&acm->write_lock, flags);
789 return stat;
790 }
791
792 if (acm->susp_count) {
793 usb_anchor_urb(wb->urb, &acm->delayed);
794 spin_unlock_irqrestore(&acm->write_lock, flags);
795 return count;
796 }
797
798 stat = acm_start_wb(acm, wb);
799 spin_unlock_irqrestore(&acm->write_lock, flags);
800
801 if (stat < 0)
802 return stat;
803 return count;
804 }
805
806 static int acm_tty_write_room(struct tty_struct *tty)
807 {
808 struct acm *acm = tty->driver_data;
809 /*
810 * Do not let the line discipline to know that we have a reserve,
811 * or it might get too enthusiastic.
812 */
813 return acm_wb_is_avail(acm) ? acm->writesize : 0;
814 }
815
816 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
817 {
818 struct acm *acm = tty->driver_data;
819 /*
820 * if the device was unplugged then any remaining characters fell out
821 * of the connector ;)
822 */
823 if (acm->disconnected)
824 return 0;
825 /*
826 * This is inaccurate (overcounts), but it works.
827 */
828 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
829 }
830
831 static void acm_tty_throttle(struct tty_struct *tty)
832 {
833 struct acm *acm = tty->driver_data;
834
835 set_bit(ACM_THROTTLED, &acm->flags);
836 }
837
838 static void acm_tty_unthrottle(struct tty_struct *tty)
839 {
840 struct acm *acm = tty->driver_data;
841
842 clear_bit(ACM_THROTTLED, &acm->flags);
843
844 /* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
845 smp_mb();
846
847 acm_submit_read_urbs(acm, GFP_KERNEL);
848 }
849
850 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
851 {
852 struct acm *acm = tty->driver_data;
853 int retval;
854
855 retval = acm_send_break(acm, state ? 0xffff : 0);
856 if (retval < 0)
857 dev_dbg(&acm->control->dev,
858 "%s - send break failed\n", __func__);
859 return retval;
860 }
861
862 static int acm_tty_tiocmget(struct tty_struct *tty)
863 {
864 struct acm *acm = tty->driver_data;
865
866 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
867 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
868 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
869 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
870 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
871 TIOCM_CTS;
872 }
873
874 static int acm_tty_tiocmset(struct tty_struct *tty,
875 unsigned int set, unsigned int clear)
876 {
877 struct acm *acm = tty->driver_data;
878 unsigned int newctrl;
879
880 newctrl = acm->ctrlout;
881 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
882 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
883 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
884 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
885
886 newctrl = (newctrl & ~clear) | set;
887
888 if (acm->ctrlout == newctrl)
889 return 0;
890 return acm_set_control(acm, acm->ctrlout = newctrl);
891 }
892
893 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
894 {
895 struct acm *acm = tty->driver_data;
896
897 ss->xmit_fifo_size = acm->writesize;
898 ss->baud_base = le32_to_cpu(acm->line.dwDTERate);
899 ss->close_delay = acm->port.close_delay / 10;
900 ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
901 ASYNC_CLOSING_WAIT_NONE :
902 acm->port.closing_wait / 10;
903 return 0;
904 }
905
906 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
907 {
908 struct acm *acm = tty->driver_data;
909 unsigned int closing_wait, close_delay;
910 int retval = 0;
911
912 close_delay = ss->close_delay * 10;
913 closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
914 ASYNC_CLOSING_WAIT_NONE : ss->closing_wait * 10;
915
916 mutex_lock(&acm->port.mutex);
917
918 if (!capable(CAP_SYS_ADMIN)) {
919 if ((close_delay != acm->port.close_delay) ||
920 (closing_wait != acm->port.closing_wait))
921 retval = -EPERM;
922 else
923 retval = -EOPNOTSUPP;
924 } else {
925 acm->port.close_delay = close_delay;
926 acm->port.closing_wait = closing_wait;
927 }
928
929 mutex_unlock(&acm->port.mutex);
930 return retval;
931 }
932
933 static int wait_serial_change(struct acm *acm, unsigned long arg)
934 {
935 int rv = 0;
936 DECLARE_WAITQUEUE(wait, current);
937 struct async_icount old, new;
938
939 do {
940 spin_lock_irq(&acm->read_lock);
941 old = acm->oldcount;
942 new = acm->iocount;
943 acm->oldcount = new;
944 spin_unlock_irq(&acm->read_lock);
945
946 if ((arg & TIOCM_DSR) &&
947 old.dsr != new.dsr)
948 break;
949 if ((arg & TIOCM_CD) &&
950 old.dcd != new.dcd)
951 break;
952 if ((arg & TIOCM_RI) &&
953 old.rng != new.rng)
954 break;
955
956 add_wait_queue(&acm->wioctl, &wait);
957 set_current_state(TASK_INTERRUPTIBLE);
958 schedule();
959 remove_wait_queue(&acm->wioctl, &wait);
960 if (acm->disconnected) {
961 if (arg & TIOCM_CD)
962 break;
963 else
964 rv = -ENODEV;
965 } else {
966 if (signal_pending(current))
967 rv = -ERESTARTSYS;
968 }
969 } while (!rv);
970
971
972
973 return rv;
974 }
975
976 static int acm_tty_get_icount(struct tty_struct *tty,
977 struct serial_icounter_struct *icount)
978 {
979 struct acm *acm = tty->driver_data;
980
981 icount->dsr = acm->iocount.dsr;
982 icount->rng = acm->iocount.rng;
983 icount->dcd = acm->iocount.dcd;
984 icount->frame = acm->iocount.frame;
985 icount->overrun = acm->iocount.overrun;
986 icount->parity = acm->iocount.parity;
987 icount->brk = acm->iocount.brk;
988
989 return 0;
990 }
991
992 static int acm_tty_ioctl(struct tty_struct *tty,
993 unsigned int cmd, unsigned long arg)
994 {
995 struct acm *acm = tty->driver_data;
996 int rv = -ENOIOCTLCMD;
997
998 switch (cmd) {
999 case TIOCMIWAIT:
1000 rv = usb_autopm_get_interface(acm->control);
1001 if (rv < 0) {
1002 rv = -EIO;
1003 break;
1004 }
1005 rv = wait_serial_change(acm, arg);
1006 usb_autopm_put_interface(acm->control);
1007 break;
1008 }
1009
1010 return rv;
1011 }
1012
1013 static void acm_tty_set_termios(struct tty_struct *tty,
1014 struct ktermios *termios_old)
1015 {
1016 struct acm *acm = tty->driver_data;
1017 struct ktermios *termios = &tty->termios;
1018 struct usb_cdc_line_coding newline;
1019 int newctrl = acm->ctrlout;
1020
1021 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1022 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1023 newline.bParityType = termios->c_cflag & PARENB ?
1024 (termios->c_cflag & PARODD ? 1 : 2) +
1025 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1026 switch (termios->c_cflag & CSIZE) {
1027 case CS5:
1028 newline.bDataBits = 5;
1029 break;
1030 case CS6:
1031 newline.bDataBits = 6;
1032 break;
1033 case CS7:
1034 newline.bDataBits = 7;
1035 break;
1036 case CS8:
1037 default:
1038 newline.bDataBits = 8;
1039 break;
1040 }
1041 /* FIXME: Needs to clear unsupported bits in the termios */
1042 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1043
1044 if (C_BAUD(tty) == B0) {
1045 newline.dwDTERate = acm->line.dwDTERate;
1046 newctrl &= ~ACM_CTRL_DTR;
1047 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1048 newctrl |= ACM_CTRL_DTR;
1049 }
1050
1051 if (newctrl != acm->ctrlout)
1052 acm_set_control(acm, acm->ctrlout = newctrl);
1053
1054 if (memcmp(&acm->line, &newline, sizeof newline)) {
1055 memcpy(&acm->line, &newline, sizeof newline);
1056 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1057 __func__,
1058 le32_to_cpu(newline.dwDTERate),
1059 newline.bCharFormat, newline.bParityType,
1060 newline.bDataBits);
1061 acm_set_line(acm, &acm->line);
1062 }
1063 }
1064
1065 static const struct tty_port_operations acm_port_ops = {
1066 .dtr_rts = acm_port_dtr_rts,
1067 .shutdown = acm_port_shutdown,
1068 .activate = acm_port_activate,
1069 .destruct = acm_port_destruct,
1070 };
1071
1072 /*
1073 * USB probe and disconnect routines.
1074 */
1075
1076 /* Little helpers: write/read buffers free */
1077 static void acm_write_buffers_free(struct acm *acm)
1078 {
1079 int i;
1080 struct acm_wb *wb;
1081
1082 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1083 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1084 }
1085
1086 static void acm_read_buffers_free(struct acm *acm)
1087 {
1088 int i;
1089
1090 for (i = 0; i < acm->rx_buflimit; i++)
1091 usb_free_coherent(acm->dev, acm->readsize,
1092 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1093 }
1094
1095 /* Little helper: write buffers allocate */
1096 static int acm_write_buffers_alloc(struct acm *acm)
1097 {
1098 int i;
1099 struct acm_wb *wb;
1100
1101 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1102 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1103 &wb->dmah);
1104 if (!wb->buf) {
1105 while (i != 0) {
1106 --i;
1107 --wb;
1108 usb_free_coherent(acm->dev, acm->writesize,
1109 wb->buf, wb->dmah);
1110 }
1111 return -ENOMEM;
1112 }
1113 }
1114 return 0;
1115 }
1116
1117 static int acm_probe(struct usb_interface *intf,
1118 const struct usb_device_id *id)
1119 {
1120 struct usb_cdc_union_desc *union_header = NULL;
1121 struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1122 unsigned char *buffer = intf->altsetting->extra;
1123 int buflen = intf->altsetting->extralen;
1124 struct usb_interface *control_interface;
1125 struct usb_interface *data_interface;
1126 struct usb_endpoint_descriptor *epctrl = NULL;
1127 struct usb_endpoint_descriptor *epread = NULL;
1128 struct usb_endpoint_descriptor *epwrite = NULL;
1129 struct usb_device *usb_dev = interface_to_usbdev(intf);
1130 struct usb_cdc_parsed_header h;
1131 struct acm *acm;
1132 int minor;
1133 int ctrlsize, readsize;
1134 u8 *buf;
1135 int call_intf_num = -1;
1136 int data_intf_num = -1;
1137 unsigned long quirks;
1138 int num_rx_buf;
1139 int i;
1140 int combined_interfaces = 0;
1141 struct device *tty_dev;
1142 int rv = -ENOMEM;
1143 int res;
1144
1145 /* normal quirks */
1146 quirks = (unsigned long)id->driver_info;
1147
1148 if (quirks == IGNORE_DEVICE)
1149 return -ENODEV;
1150
1151 memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1152
1153 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1154
1155 /* handle quirks deadly to normal probing*/
1156 if (quirks == NO_UNION_NORMAL) {
1157 data_interface = usb_ifnum_to_if(usb_dev, 1);
1158 control_interface = usb_ifnum_to_if(usb_dev, 0);
1159 /* we would crash */
1160 if (!data_interface || !control_interface)
1161 return -ENODEV;
1162 goto skip_normal_probe;
1163 }
1164
1165 /* normal probing*/
1166 if (!buffer) {
1167 dev_err(&intf->dev, "Weird descriptor references\n");
1168 return -EINVAL;
1169 }
1170
1171 if (!intf->cur_altsetting)
1172 return -EINVAL;
1173
1174 if (!buflen) {
1175 if (intf->cur_altsetting->endpoint &&
1176 intf->cur_altsetting->endpoint->extralen &&
1177 intf->cur_altsetting->endpoint->extra) {
1178 dev_dbg(&intf->dev,
1179 "Seeking extra descriptors on endpoint\n");
1180 buflen = intf->cur_altsetting->endpoint->extralen;
1181 buffer = intf->cur_altsetting->endpoint->extra;
1182 } else {
1183 dev_err(&intf->dev,
1184 "Zero length descriptor references\n");
1185 return -EINVAL;
1186 }
1187 }
1188
1189 cdc_parse_cdc_header(&h, intf, buffer, buflen);
1190 union_header = h.usb_cdc_union_desc;
1191 cmgmd = h.usb_cdc_call_mgmt_descriptor;
1192 if (cmgmd)
1193 call_intf_num = cmgmd->bDataInterface;
1194
1195 if (!union_header) {
1196 if (call_intf_num > 0) {
1197 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1198 /* quirks for Droids MuIn LCD */
1199 if (quirks & NO_DATA_INTERFACE) {
1200 data_interface = usb_ifnum_to_if(usb_dev, 0);
1201 } else {
1202 data_intf_num = call_intf_num;
1203 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1204 }
1205 control_interface = intf;
1206 } else {
1207 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1208 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1209 return -ENODEV;
1210 } else {
1211 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1212 combined_interfaces = 1;
1213 control_interface = data_interface = intf;
1214 goto look_for_collapsed_interface;
1215 }
1216 }
1217 } else {
1218 data_intf_num = union_header->bSlaveInterface0;
1219 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1220 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1221 }
1222
1223 if (!control_interface || !data_interface) {
1224 dev_dbg(&intf->dev, "no interfaces\n");
1225 return -ENODEV;
1226 }
1227 if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1228 return -ENODEV;
1229
1230 if (data_intf_num != call_intf_num)
1231 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1232
1233 if (control_interface == data_interface) {
1234 /* some broken devices designed for windows work this way */
1235 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1236 combined_interfaces = 1;
1237 /* a popular other OS doesn't use it */
1238 quirks |= NO_CAP_LINE;
1239 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1240 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1241 return -EINVAL;
1242 }
1243 look_for_collapsed_interface:
1244 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1245 &epread, &epwrite, &epctrl, NULL);
1246 if (res)
1247 return res;
1248
1249 goto made_compressed_probe;
1250 }
1251
1252 skip_normal_probe:
1253
1254 /*workaround for switched interfaces */
1255 if (data_interface->cur_altsetting->desc.bInterfaceClass
1256 != CDC_DATA_INTERFACE_TYPE) {
1257 if (control_interface->cur_altsetting->desc.bInterfaceClass
1258 == CDC_DATA_INTERFACE_TYPE) {
1259 dev_dbg(&intf->dev,
1260 "Your device has switched interfaces.\n");
1261 swap(control_interface, data_interface);
1262 } else {
1263 return -EINVAL;
1264 }
1265 }
1266
1267 /* Accept probe requests only for the control interface */
1268 if (!combined_interfaces && intf != control_interface)
1269 return -ENODEV;
1270
1271 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1272 /* valid in this context */
1273 dev_dbg(&intf->dev, "The data interface isn't available\n");
1274 return -EBUSY;
1275 }
1276
1277
1278 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1279 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1280 return -EINVAL;
1281
1282 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1283 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1284 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1285
1286
1287 /* workaround for switched endpoints */
1288 if (!usb_endpoint_dir_in(epread)) {
1289 /* descriptors are swapped */
1290 dev_dbg(&intf->dev,
1291 "The data interface has switched endpoints\n");
1292 swap(epread, epwrite);
1293 }
1294 made_compressed_probe:
1295 dev_dbg(&intf->dev, "interfaces are valid\n");
1296
1297 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1298 if (acm == NULL)
1299 goto alloc_fail;
1300
1301 tty_port_init(&acm->port);
1302 acm->port.ops = &acm_port_ops;
1303
1304 minor = acm_alloc_minor(acm);
1305 if (minor < 0)
1306 goto alloc_fail1;
1307
1308 ctrlsize = usb_endpoint_maxp(epctrl);
1309 readsize = usb_endpoint_maxp(epread) *
1310 (quirks == SINGLE_RX_URB ? 1 : 2);
1311 acm->combined_interfaces = combined_interfaces;
1312 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1313 acm->control = control_interface;
1314 acm->data = data_interface;
1315 acm->minor = minor;
1316 acm->dev = usb_dev;
1317 if (h.usb_cdc_acm_descriptor)
1318 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1319 if (quirks & NO_CAP_LINE)
1320 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1321 acm->ctrlsize = ctrlsize;
1322 acm->readsize = readsize;
1323 acm->rx_buflimit = num_rx_buf;
1324 INIT_WORK(&acm->work, acm_softint);
1325 init_waitqueue_head(&acm->wioctl);
1326 spin_lock_init(&acm->write_lock);
1327 spin_lock_init(&acm->read_lock);
1328 mutex_init(&acm->mutex);
1329 if (usb_endpoint_xfer_int(epread)) {
1330 acm->bInterval = epread->bInterval;
1331 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1332 } else {
1333 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1334 }
1335 if (usb_endpoint_xfer_int(epwrite))
1336 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1337 else
1338 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1339 init_usb_anchor(&acm->delayed);
1340 acm->quirks = quirks;
1341
1342 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1343 if (!buf)
1344 goto alloc_fail1;
1345 acm->ctrl_buffer = buf;
1346
1347 if (acm_write_buffers_alloc(acm) < 0)
1348 goto alloc_fail2;
1349
1350 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1351 if (!acm->ctrlurb)
1352 goto alloc_fail3;
1353
1354 for (i = 0; i < num_rx_buf; i++) {
1355 struct acm_rb *rb = &(acm->read_buffers[i]);
1356 struct urb *urb;
1357
1358 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1359 &rb->dma);
1360 if (!rb->base)
1361 goto alloc_fail4;
1362 rb->index = i;
1363 rb->instance = acm;
1364
1365 urb = usb_alloc_urb(0, GFP_KERNEL);
1366 if (!urb)
1367 goto alloc_fail4;
1368
1369 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1370 urb->transfer_dma = rb->dma;
1371 if (usb_endpoint_xfer_int(epread))
1372 usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1373 acm->readsize,
1374 acm_read_bulk_callback, rb,
1375 acm->bInterval);
1376 else
1377 usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1378 acm->readsize,
1379 acm_read_bulk_callback, rb);
1380
1381 acm->read_urbs[i] = urb;
1382 __set_bit(i, &acm->read_urbs_free);
1383 }
1384 for (i = 0; i < ACM_NW; i++) {
1385 struct acm_wb *snd = &(acm->wb[i]);
1386
1387 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1388 if (snd->urb == NULL)
1389 goto alloc_fail5;
1390
1391 if (usb_endpoint_xfer_int(epwrite))
1392 usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1393 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1394 else
1395 usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1396 NULL, acm->writesize, acm_write_bulk, snd);
1397 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1398 if (quirks & SEND_ZERO_PACKET)
1399 snd->urb->transfer_flags |= URB_ZERO_PACKET;
1400 snd->instance = acm;
1401 }
1402
1403 usb_set_intfdata(intf, acm);
1404
1405 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1406 if (i < 0)
1407 goto alloc_fail5;
1408
1409 if (h.usb_cdc_country_functional_desc) { /* export the country data */
1410 struct usb_cdc_country_functional_desc * cfd =
1411 h.usb_cdc_country_functional_desc;
1412
1413 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1414 if (!acm->country_codes)
1415 goto skip_countries;
1416 acm->country_code_size = cfd->bLength - 4;
1417 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1418 cfd->bLength - 4);
1419 acm->country_rel_date = cfd->iCountryCodeRelDate;
1420
1421 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1422 if (i < 0) {
1423 kfree(acm->country_codes);
1424 acm->country_codes = NULL;
1425 acm->country_code_size = 0;
1426 goto skip_countries;
1427 }
1428
1429 i = device_create_file(&intf->dev,
1430 &dev_attr_iCountryCodeRelDate);
1431 if (i < 0) {
1432 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1433 kfree(acm->country_codes);
1434 acm->country_codes = NULL;
1435 acm->country_code_size = 0;
1436 goto skip_countries;
1437 }
1438 }
1439
1440 skip_countries:
1441 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1442 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1443 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1444 /* works around buggy devices */
1445 epctrl->bInterval ? epctrl->bInterval : 16);
1446 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1447 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1448 acm->notification_buffer = NULL;
1449 acm->nb_index = 0;
1450 acm->nb_size = 0;
1451
1452 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1453
1454 acm->line.dwDTERate = cpu_to_le32(9600);
1455 acm->line.bDataBits = 8;
1456 acm_set_line(acm, &acm->line);
1457
1458 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1459 usb_set_intfdata(data_interface, acm);
1460
1461 usb_get_intf(control_interface);
1462 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1463 &control_interface->dev);
1464 if (IS_ERR(tty_dev)) {
1465 rv = PTR_ERR(tty_dev);
1466 goto alloc_fail6;
1467 }
1468
1469 if (quirks & CLEAR_HALT_CONDITIONS) {
1470 usb_clear_halt(usb_dev, acm->in);
1471 usb_clear_halt(usb_dev, acm->out);
1472 }
1473
1474 return 0;
1475 alloc_fail6:
1476 if (acm->country_codes) {
1477 device_remove_file(&acm->control->dev,
1478 &dev_attr_wCountryCodes);
1479 device_remove_file(&acm->control->dev,
1480 &dev_attr_iCountryCodeRelDate);
1481 kfree(acm->country_codes);
1482 }
1483 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1484 alloc_fail5:
1485 usb_set_intfdata(intf, NULL);
1486 for (i = 0; i < ACM_NW; i++)
1487 usb_free_urb(acm->wb[i].urb);
1488 alloc_fail4:
1489 for (i = 0; i < num_rx_buf; i++)
1490 usb_free_urb(acm->read_urbs[i]);
1491 acm_read_buffers_free(acm);
1492 usb_free_urb(acm->ctrlurb);
1493 alloc_fail3:
1494 acm_write_buffers_free(acm);
1495 alloc_fail2:
1496 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1497 alloc_fail1:
1498 tty_port_put(&acm->port);
1499 alloc_fail:
1500 return rv;
1501 }
1502
1503 static void acm_disconnect(struct usb_interface *intf)
1504 {
1505 struct acm *acm = usb_get_intfdata(intf);
1506 struct tty_struct *tty;
1507 int i;
1508
1509 /* sibling interface is already cleaning up */
1510 if (!acm)
1511 return;
1512
1513 mutex_lock(&acm->mutex);
1514 acm->disconnected = true;
1515 if (acm->country_codes) {
1516 device_remove_file(&acm->control->dev,
1517 &dev_attr_wCountryCodes);
1518 device_remove_file(&acm->control->dev,
1519 &dev_attr_iCountryCodeRelDate);
1520 }
1521 wake_up_all(&acm->wioctl);
1522 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1523 usb_set_intfdata(acm->control, NULL);
1524 usb_set_intfdata(acm->data, NULL);
1525 mutex_unlock(&acm->mutex);
1526
1527 tty = tty_port_tty_get(&acm->port);
1528 if (tty) {
1529 tty_vhangup(tty);
1530 tty_kref_put(tty);
1531 }
1532
1533 acm_kill_urbs(acm);
1534 cancel_work_sync(&acm->work);
1535
1536 tty_unregister_device(acm_tty_driver, acm->minor);
1537
1538 usb_free_urb(acm->ctrlurb);
1539 for (i = 0; i < ACM_NW; i++)
1540 usb_free_urb(acm->wb[i].urb);
1541 for (i = 0; i < acm->rx_buflimit; i++)
1542 usb_free_urb(acm->read_urbs[i]);
1543 acm_write_buffers_free(acm);
1544 usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1545 acm_read_buffers_free(acm);
1546
1547 kfree(acm->notification_buffer);
1548
1549 if (!acm->combined_interfaces)
1550 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1551 acm->data : acm->control);
1552
1553 tty_port_put(&acm->port);
1554 }
1555
1556 #ifdef CONFIG_PM
1557 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1558 {
1559 struct acm *acm = usb_get_intfdata(intf);
1560 int cnt;
1561
1562 spin_lock_irq(&acm->write_lock);
1563 if (PMSG_IS_AUTO(message)) {
1564 if (acm->transmitting) {
1565 spin_unlock_irq(&acm->write_lock);
1566 return -EBUSY;
1567 }
1568 }
1569 cnt = acm->susp_count++;
1570 spin_unlock_irq(&acm->write_lock);
1571
1572 if (cnt)
1573 return 0;
1574
1575 acm_kill_urbs(acm);
1576 cancel_work_sync(&acm->work);
1577
1578 return 0;
1579 }
1580
1581 static int acm_resume(struct usb_interface *intf)
1582 {
1583 struct acm *acm = usb_get_intfdata(intf);
1584 struct urb *urb;
1585 int rv = 0;
1586
1587 spin_lock_irq(&acm->write_lock);
1588
1589 if (--acm->susp_count)
1590 goto out;
1591
1592 if (tty_port_initialized(&acm->port)) {
1593 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1594
1595 for (;;) {
1596 urb = usb_get_from_anchor(&acm->delayed);
1597 if (!urb)
1598 break;
1599
1600 acm_start_wb(acm, urb->context);
1601 }
1602
1603 /*
1604 * delayed error checking because we must
1605 * do the write path at all cost
1606 */
1607 if (rv < 0)
1608 goto out;
1609
1610 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1611 }
1612 out:
1613 spin_unlock_irq(&acm->write_lock);
1614
1615 return rv;
1616 }
1617
1618 static int acm_reset_resume(struct usb_interface *intf)
1619 {
1620 struct acm *acm = usb_get_intfdata(intf);
1621
1622 if (tty_port_initialized(&acm->port))
1623 tty_port_tty_hangup(&acm->port, false);
1624
1625 return acm_resume(intf);
1626 }
1627
1628 #endif /* CONFIG_PM */
1629
1630 static int acm_pre_reset(struct usb_interface *intf)
1631 {
1632 struct acm *acm = usb_get_intfdata(intf);
1633
1634 clear_bit(EVENT_RX_STALL, &acm->flags);
1635 acm->nb_index = 0; /* pending control transfers are lost */
1636
1637 return 0;
1638 }
1639
1640 #define NOKIA_PCSUITE_ACM_INFO(x) \
1641 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1642 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1643 USB_CDC_ACM_PROTO_VENDOR)
1644
1645 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1646 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1647 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1648 USB_CDC_ACM_PROTO_VENDOR)
1649
1650 /*
1651 * USB driver structure.
1652 */
1653
1654 static const struct usb_device_id acm_ids[] = {
1655 /* quirky and broken devices */
1656 { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1657 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1658 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1659 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1660 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1661 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1662 },
1663 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1664 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1665 },
1666 { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1667 .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1668 },
1669 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1670 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1671 },
1672 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1673 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1674 },
1675 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1676 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1677 },
1678 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1679 .driver_info = SINGLE_RX_URB,
1680 },
1681 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1682 .driver_info = SINGLE_RX_URB, /* firmware bug */
1683 },
1684 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1685 .driver_info = SINGLE_RX_URB, /* firmware bug */
1686 },
1687 { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1688 .driver_info = SINGLE_RX_URB,
1689 },
1690 { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1691 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1692 },
1693 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1694 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1695 },
1696 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1697 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1698 },
1699 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1700 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1701 },
1702 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1703 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1704 },
1705 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1706 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1707 },
1708 { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1709 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1710 },
1711 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1712 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1713 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1714 { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1715 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1716 },
1717 /* Motorola H24 HSPA module: */
1718 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1719 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1720 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1721 },
1722 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1723 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1724 },
1725 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1726 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1727 },
1728 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1729 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1730 },
1731 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1732 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1733 },
1734 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1735 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1736 },
1737 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1738 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1739 },
1740
1741 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1742 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1743 data interface instead of
1744 communications interface.
1745 Maybe we should define a new
1746 quirk for this. */
1747 },
1748 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1749 .driver_info = NO_UNION_NORMAL,
1750 },
1751 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1752 .driver_info = NO_UNION_NORMAL,
1753 },
1754 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1755 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1756 },
1757 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1758 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1759 },
1760 { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1761 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1762 },
1763 { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1764 .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1765 },
1766 { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1767 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1768 },
1769
1770 { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1771 .driver_info = CLEAR_HALT_CONDITIONS,
1772 },
1773
1774 /* Nokia S60 phones expose two ACM channels. The first is
1775 * a modem and is picked up by the standard AT-command
1776 * information below. The second is 'vendor-specific' but
1777 * is treated as a serial device at the S60 end, so we want
1778 * to expose it on Linux too. */
1779 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1780 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1781 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1782 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1783 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1784 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1785 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1786 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1787 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1788 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1789 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1790 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1791 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1792 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1793 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1794 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1795 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1796 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1797 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1798 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1799 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1800 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1801 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1802 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1803 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1804 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1805 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1806 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1807 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1808 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1809 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1810 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1811 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1812 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1813 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1814 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1815 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1816 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1817 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1818 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1819 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1820 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1821 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1822 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1823 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1824 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1825 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1826 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1827 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1828 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1829 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1830 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1831 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1832 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1833 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1834 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1835 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1836 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1837
1838 /* Support for Owen devices */
1839 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1840
1841 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1842
1843 /* Support for Droids MuIn LCD */
1844 { USB_DEVICE(0x04d8, 0x000b),
1845 .driver_info = NO_DATA_INTERFACE,
1846 },
1847
1848 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1849 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1850 .driver_info = IGNORE_DEVICE,
1851 },
1852 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1853 .driver_info = IGNORE_DEVICE,
1854 },
1855 #endif
1856
1857 /*Samsung phone in firmware update mode */
1858 { USB_DEVICE(0x04e8, 0x685d),
1859 .driver_info = IGNORE_DEVICE,
1860 },
1861
1862 /* Exclude Infineon Flash Loader utility */
1863 { USB_DEVICE(0x058b, 0x0041),
1864 .driver_info = IGNORE_DEVICE,
1865 },
1866
1867 { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1868 .driver_info = SEND_ZERO_PACKET,
1869 },
1870 { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1871 .driver_info = SEND_ZERO_PACKET,
1872 },
1873
1874 /* control interfaces without any protocol set */
1875 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1876 USB_CDC_PROTO_NONE) },
1877
1878 /* control interfaces with various AT-command sets */
1879 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1880 USB_CDC_ACM_PROTO_AT_V25TER) },
1881 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1882 USB_CDC_ACM_PROTO_AT_PCCA101) },
1883 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1884 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1885 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1886 USB_CDC_ACM_PROTO_AT_GSM) },
1887 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1888 USB_CDC_ACM_PROTO_AT_3G) },
1889 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1890 USB_CDC_ACM_PROTO_AT_CDMA) },
1891
1892 { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1893 .driver_info = SEND_ZERO_PACKET,
1894 },
1895
1896 { }
1897 };
1898
1899 MODULE_DEVICE_TABLE(usb, acm_ids);
1900
1901 static struct usb_driver acm_driver = {
1902 .name = "cdc_acm",
1903 .probe = acm_probe,
1904 .disconnect = acm_disconnect,
1905 #ifdef CONFIG_PM
1906 .suspend = acm_suspend,
1907 .resume = acm_resume,
1908 .reset_resume = acm_reset_resume,
1909 #endif
1910 .pre_reset = acm_pre_reset,
1911 .id_table = acm_ids,
1912 #ifdef CONFIG_PM
1913 .supports_autosuspend = 1,
1914 #endif
1915 .disable_hub_initiated_lpm = 1,
1916 };
1917
1918 /*
1919 * TTY driver structures.
1920 */
1921
1922 static const struct tty_operations acm_ops = {
1923 .install = acm_tty_install,
1924 .open = acm_tty_open,
1925 .close = acm_tty_close,
1926 .cleanup = acm_tty_cleanup,
1927 .hangup = acm_tty_hangup,
1928 .write = acm_tty_write,
1929 .write_room = acm_tty_write_room,
1930 .ioctl = acm_tty_ioctl,
1931 .throttle = acm_tty_throttle,
1932 .unthrottle = acm_tty_unthrottle,
1933 .chars_in_buffer = acm_tty_chars_in_buffer,
1934 .break_ctl = acm_tty_break_ctl,
1935 .set_termios = acm_tty_set_termios,
1936 .tiocmget = acm_tty_tiocmget,
1937 .tiocmset = acm_tty_tiocmset,
1938 .get_serial = get_serial_info,
1939 .set_serial = set_serial_info,
1940 .get_icount = acm_tty_get_icount,
1941 };
1942
1943 /*
1944 * Init / exit.
1945 */
1946
1947 static int __init acm_init(void)
1948 {
1949 int retval;
1950 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1951 if (!acm_tty_driver)
1952 return -ENOMEM;
1953 acm_tty_driver->driver_name = "acm",
1954 acm_tty_driver->name = "ttyACM",
1955 acm_tty_driver->major = ACM_TTY_MAJOR,
1956 acm_tty_driver->minor_start = 0,
1957 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1958 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1959 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1960 acm_tty_driver->init_termios = tty_std_termios;
1961 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1962 HUPCL | CLOCAL;
1963 tty_set_operations(acm_tty_driver, &acm_ops);
1964
1965 retval = tty_register_driver(acm_tty_driver);
1966 if (retval) {
1967 put_tty_driver(acm_tty_driver);
1968 return retval;
1969 }
1970
1971 retval = usb_register(&acm_driver);
1972 if (retval) {
1973 tty_unregister_driver(acm_tty_driver);
1974 put_tty_driver(acm_tty_driver);
1975 return retval;
1976 }
1977
1978 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1979
1980 return 0;
1981 }
1982
1983 static void __exit acm_exit(void)
1984 {
1985 usb_deregister(&acm_driver);
1986 tty_unregister_driver(acm_tty_driver);
1987 put_tty_driver(acm_tty_driver);
1988 idr_destroy(&acm_minors);
1989 }
1990
1991 module_init(acm_init);
1992 module_exit(acm_exit);
1993
1994 MODULE_AUTHOR(DRIVER_AUTHOR);
1995 MODULE_DESCRIPTION(DRIVER_DESC);
1996 MODULE_LICENSE("GPL");
1997 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
Linux with added FPC-III support