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Merge remote-tracking branches 'regmap/fix/irq', 'regmap/fix/rbtree' and 'regmap...
[deliverable/linux.git] / drivers / usb / class / cdc-acm.c
1 /*
2 * cdc-acm.c
3 *
4 * Copyright (c) 1999 Armin Fuerst <fuerst@in.tum.de>
5 * Copyright (c) 1999 Pavel Machek <pavel@ucw.cz>
6 * Copyright (c) 1999 Johannes Erdfelt <johannes@erdfelt.com>
7 * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz>
8 * Copyright (c) 2004 Oliver Neukum <oliver@neukum.name>
9 * Copyright (c) 2005 David Kubicek <dave@awk.cz>
10 * Copyright (c) 2011 Johan Hovold <jhovold@gmail.com>
11 *
12 * USB Abstract Control Model driver for USB modems and ISDN adapters
13 *
14 * Sponsored by SuSE
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 */
30
31 #undef DEBUG
32 #undef VERBOSE_DEBUG
33
34 #include <linux/kernel.h>
35 #include <linux/errno.h>
36 #include <linux/init.h>
37 #include <linux/slab.h>
38 #include <linux/tty.h>
39 #include <linux/serial.h>
40 #include <linux/tty_driver.h>
41 #include <linux/tty_flip.h>
42 #include <linux/module.h>
43 #include <linux/mutex.h>
44 #include <linux/uaccess.h>
45 #include <linux/usb.h>
46 #include <linux/usb/cdc.h>
47 #include <asm/byteorder.h>
48 #include <asm/unaligned.h>
49 #include <linux/list.h>
50
51 #include "cdc-acm.h"
52
53
54 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
55 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
56
57 static struct usb_driver acm_driver;
58 static struct tty_driver *acm_tty_driver;
59 static struct acm *acm_table[ACM_TTY_MINORS];
60
61 static DEFINE_MUTEX(acm_table_lock);
62
63 static void acm_tty_set_termios(struct tty_struct *tty,
64 struct ktermios *termios_old);
65
66 /*
67 * acm_table accessors
68 */
69
70 /*
71 * Look up an ACM structure by index. If found and not disconnected, increment
72 * its refcount and return it with its mutex held.
73 */
74 static struct acm *acm_get_by_index(unsigned index)
75 {
76 struct acm *acm;
77
78 mutex_lock(&acm_table_lock);
79 acm = acm_table[index];
80 if (acm) {
81 mutex_lock(&acm->mutex);
82 if (acm->disconnected) {
83 mutex_unlock(&acm->mutex);
84 acm = NULL;
85 } else {
86 tty_port_get(&acm->port);
87 mutex_unlock(&acm->mutex);
88 }
89 }
90 mutex_unlock(&acm_table_lock);
91 return acm;
92 }
93
94 /*
95 * Try to find an available minor number and if found, associate it with 'acm'.
96 */
97 static int acm_alloc_minor(struct acm *acm)
98 {
99 int minor;
100
101 mutex_lock(&acm_table_lock);
102 for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
103 if (!acm_table[minor]) {
104 acm_table[minor] = acm;
105 break;
106 }
107 }
108 mutex_unlock(&acm_table_lock);
109
110 return minor;
111 }
112
113 /* Release the minor number associated with 'acm'. */
114 static void acm_release_minor(struct acm *acm)
115 {
116 mutex_lock(&acm_table_lock);
117 acm_table[acm->minor] = NULL;
118 mutex_unlock(&acm_table_lock);
119 }
120
121 /*
122 * Functions for ACM control messages.
123 */
124
125 static int acm_ctrl_msg(struct acm *acm, int request, int value,
126 void *buf, int len)
127 {
128 int retval;
129
130 retval = usb_autopm_get_interface(acm->control);
131 if (retval)
132 return retval;
133
134 retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
135 request, USB_RT_ACM, value,
136 acm->control->altsetting[0].desc.bInterfaceNumber,
137 buf, len, 5000);
138
139 dev_dbg(&acm->control->dev,
140 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
141 __func__, request, value, len, retval);
142
143 usb_autopm_put_interface(acm->control);
144
145 return retval < 0 ? retval : 0;
146 }
147
148 /* devices aren't required to support these requests.
149 * the cdc acm descriptor tells whether they do...
150 */
151 static inline int acm_set_control(struct acm *acm, int control)
152 {
153 if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
154 return -EOPNOTSUPP;
155
156 return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
157 control, NULL, 0);
158 }
159
160 #define acm_set_line(acm, line) \
161 acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
162 #define acm_send_break(acm, ms) \
163 acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
164
165 /*
166 * Write buffer management.
167 * All of these assume proper locks taken by the caller.
168 */
169
170 static int acm_wb_alloc(struct acm *acm)
171 {
172 int i, wbn;
173 struct acm_wb *wb;
174
175 wbn = 0;
176 i = 0;
177 for (;;) {
178 wb = &acm->wb[wbn];
179 if (!wb->use) {
180 wb->use = 1;
181 return wbn;
182 }
183 wbn = (wbn + 1) % ACM_NW;
184 if (++i >= ACM_NW)
185 return -1;
186 }
187 }
188
189 static int acm_wb_is_avail(struct acm *acm)
190 {
191 int i, n;
192 unsigned long flags;
193
194 n = ACM_NW;
195 spin_lock_irqsave(&acm->write_lock, flags);
196 for (i = 0; i < ACM_NW; i++)
197 n -= acm->wb[i].use;
198 spin_unlock_irqrestore(&acm->write_lock, flags);
199 return n;
200 }
201
202 /*
203 * Finish write. Caller must hold acm->write_lock
204 */
205 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
206 {
207 wb->use = 0;
208 acm->transmitting--;
209 usb_autopm_put_interface_async(acm->control);
210 }
211
212 /*
213 * Poke write.
214 *
215 * the caller is responsible for locking
216 */
217
218 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
219 {
220 int rc;
221
222 acm->transmitting++;
223
224 wb->urb->transfer_buffer = wb->buf;
225 wb->urb->transfer_dma = wb->dmah;
226 wb->urb->transfer_buffer_length = wb->len;
227 wb->urb->dev = acm->dev;
228
229 rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
230 if (rc < 0) {
231 dev_err(&acm->data->dev,
232 "%s - usb_submit_urb(write bulk) failed: %d\n",
233 __func__, rc);
234 acm_write_done(acm, wb);
235 }
236 return rc;
237 }
238
239 /*
240 * attributes exported through sysfs
241 */
242 static ssize_t show_caps
243 (struct device *dev, struct device_attribute *attr, char *buf)
244 {
245 struct usb_interface *intf = to_usb_interface(dev);
246 struct acm *acm = usb_get_intfdata(intf);
247
248 return sprintf(buf, "%d", acm->ctrl_caps);
249 }
250 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
251
252 static ssize_t show_country_codes
253 (struct device *dev, struct device_attribute *attr, char *buf)
254 {
255 struct usb_interface *intf = to_usb_interface(dev);
256 struct acm *acm = usb_get_intfdata(intf);
257
258 memcpy(buf, acm->country_codes, acm->country_code_size);
259 return acm->country_code_size;
260 }
261
262 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
263
264 static ssize_t show_country_rel_date
265 (struct device *dev, struct device_attribute *attr, char *buf)
266 {
267 struct usb_interface *intf = to_usb_interface(dev);
268 struct acm *acm = usb_get_intfdata(intf);
269
270 return sprintf(buf, "%d", acm->country_rel_date);
271 }
272
273 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
274 /*
275 * Interrupt handlers for various ACM device responses
276 */
277
278 /* control interface reports status changes with "interrupt" transfers */
279 static void acm_ctrl_irq(struct urb *urb)
280 {
281 struct acm *acm = urb->context;
282 struct usb_cdc_notification *dr = urb->transfer_buffer;
283 unsigned char *data;
284 int newctrl;
285 int difference;
286 int retval;
287 int status = urb->status;
288
289 switch (status) {
290 case 0:
291 /* success */
292 break;
293 case -ECONNRESET:
294 case -ENOENT:
295 case -ESHUTDOWN:
296 /* this urb is terminated, clean up */
297 dev_dbg(&acm->control->dev,
298 "%s - urb shutting down with status: %d\n",
299 __func__, status);
300 return;
301 default:
302 dev_dbg(&acm->control->dev,
303 "%s - nonzero urb status received: %d\n",
304 __func__, status);
305 goto exit;
306 }
307
308 usb_mark_last_busy(acm->dev);
309
310 data = (unsigned char *)(dr + 1);
311 switch (dr->bNotificationType) {
312 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
313 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
314 __func__, dr->wValue);
315 break;
316
317 case USB_CDC_NOTIFY_SERIAL_STATE:
318 newctrl = get_unaligned_le16(data);
319
320 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
321 dev_dbg(&acm->control->dev, "%s - calling hangup\n",
322 __func__);
323 tty_port_tty_hangup(&acm->port, false);
324 }
325
326 difference = acm->ctrlin ^ newctrl;
327 spin_lock(&acm->read_lock);
328 acm->ctrlin = newctrl;
329 acm->oldcount = acm->iocount;
330
331 if (difference & ACM_CTRL_DSR)
332 acm->iocount.dsr++;
333 if (difference & ACM_CTRL_BRK)
334 acm->iocount.brk++;
335 if (difference & ACM_CTRL_RI)
336 acm->iocount.rng++;
337 if (difference & ACM_CTRL_DCD)
338 acm->iocount.dcd++;
339 if (difference & ACM_CTRL_FRAMING)
340 acm->iocount.frame++;
341 if (difference & ACM_CTRL_PARITY)
342 acm->iocount.parity++;
343 if (difference & ACM_CTRL_OVERRUN)
344 acm->iocount.overrun++;
345 spin_unlock(&acm->read_lock);
346
347 if (difference)
348 wake_up_all(&acm->wioctl);
349
350 break;
351
352 default:
353 dev_dbg(&acm->control->dev,
354 "%s - unknown notification %d received: index %d "
355 "len %d data0 %d data1 %d\n",
356 __func__,
357 dr->bNotificationType, dr->wIndex,
358 dr->wLength, data[0], data[1]);
359 break;
360 }
361 exit:
362 retval = usb_submit_urb(urb, GFP_ATOMIC);
363 if (retval)
364 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
365 __func__, retval);
366 }
367
368 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
369 {
370 int res;
371
372 if (!test_and_clear_bit(index, &acm->read_urbs_free))
373 return 0;
374
375 dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
376
377 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
378 if (res) {
379 if (res != -EPERM) {
380 dev_err(&acm->data->dev,
381 "%s - usb_submit_urb failed: %d\n",
382 __func__, res);
383 }
384 set_bit(index, &acm->read_urbs_free);
385 return res;
386 }
387
388 return 0;
389 }
390
391 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
392 {
393 int res;
394 int i;
395
396 for (i = 0; i < acm->rx_buflimit; ++i) {
397 res = acm_submit_read_urb(acm, i, mem_flags);
398 if (res)
399 return res;
400 }
401
402 return 0;
403 }
404
405 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
406 {
407 if (!urb->actual_length)
408 return;
409
410 tty_insert_flip_string(&acm->port, urb->transfer_buffer,
411 urb->actual_length);
412 tty_flip_buffer_push(&acm->port);
413 }
414
415 static void acm_read_bulk_callback(struct urb *urb)
416 {
417 struct acm_rb *rb = urb->context;
418 struct acm *acm = rb->instance;
419 unsigned long flags;
420
421 dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
422 rb->index, urb->actual_length);
423 set_bit(rb->index, &acm->read_urbs_free);
424
425 if (!acm->dev) {
426 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
427 return;
428 }
429
430 if (urb->status) {
431 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
432 __func__, urb->status);
433 return;
434 }
435
436 usb_mark_last_busy(acm->dev);
437
438 acm_process_read_urb(acm, urb);
439
440 /* throttle device if requested by tty */
441 spin_lock_irqsave(&acm->read_lock, flags);
442 acm->throttled = acm->throttle_req;
443 if (!acm->throttled) {
444 spin_unlock_irqrestore(&acm->read_lock, flags);
445 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
446 } else {
447 spin_unlock_irqrestore(&acm->read_lock, flags);
448 }
449 }
450
451 /* data interface wrote those outgoing bytes */
452 static void acm_write_bulk(struct urb *urb)
453 {
454 struct acm_wb *wb = urb->context;
455 struct acm *acm = wb->instance;
456 unsigned long flags;
457
458 if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
459 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
460 __func__,
461 urb->actual_length,
462 urb->transfer_buffer_length,
463 urb->status);
464
465 spin_lock_irqsave(&acm->write_lock, flags);
466 acm_write_done(acm, wb);
467 spin_unlock_irqrestore(&acm->write_lock, flags);
468 schedule_work(&acm->work);
469 }
470
471 static void acm_softint(struct work_struct *work)
472 {
473 struct acm *acm = container_of(work, struct acm, work);
474
475 dev_vdbg(&acm->data->dev, "%s\n", __func__);
476
477 tty_port_tty_wakeup(&acm->port);
478 }
479
480 /*
481 * TTY handlers
482 */
483
484 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
485 {
486 struct acm *acm;
487 int retval;
488
489 dev_dbg(tty->dev, "%s\n", __func__);
490
491 acm = acm_get_by_index(tty->index);
492 if (!acm)
493 return -ENODEV;
494
495 retval = tty_standard_install(driver, tty);
496 if (retval)
497 goto error_init_termios;
498
499 tty->driver_data = acm;
500
501 return 0;
502
503 error_init_termios:
504 tty_port_put(&acm->port);
505 return retval;
506 }
507
508 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
509 {
510 struct acm *acm = tty->driver_data;
511
512 dev_dbg(tty->dev, "%s\n", __func__);
513
514 return tty_port_open(&acm->port, tty, filp);
515 }
516
517 static void acm_port_dtr_rts(struct tty_port *port, int raise)
518 {
519 struct acm *acm = container_of(port, struct acm, port);
520 int val;
521 int res;
522
523 if (raise)
524 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
525 else
526 val = 0;
527
528 /* FIXME: add missing ctrlout locking throughout driver */
529 acm->ctrlout = val;
530
531 res = acm_set_control(acm, val);
532 if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
533 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
534 }
535
536 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
537 {
538 struct acm *acm = container_of(port, struct acm, port);
539 int retval = -ENODEV;
540 int i;
541
542 dev_dbg(&acm->control->dev, "%s\n", __func__);
543
544 mutex_lock(&acm->mutex);
545 if (acm->disconnected)
546 goto disconnected;
547
548 retval = usb_autopm_get_interface(acm->control);
549 if (retval)
550 goto error_get_interface;
551
552 /*
553 * FIXME: Why do we need this? Allocating 64K of physically contiguous
554 * memory is really nasty...
555 */
556 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
557 acm->control->needs_remote_wakeup = 1;
558
559 acm->ctrlurb->dev = acm->dev;
560 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
561 if (retval) {
562 dev_err(&acm->control->dev,
563 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
564 goto error_submit_urb;
565 }
566
567 acm_tty_set_termios(tty, NULL);
568
569 /*
570 * Unthrottle device in case the TTY was closed while throttled.
571 */
572 spin_lock_irq(&acm->read_lock);
573 acm->throttled = 0;
574 acm->throttle_req = 0;
575 spin_unlock_irq(&acm->read_lock);
576
577 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
578 if (retval)
579 goto error_submit_read_urbs;
580
581 usb_autopm_put_interface(acm->control);
582
583 mutex_unlock(&acm->mutex);
584
585 return 0;
586
587 error_submit_read_urbs:
588 for (i = 0; i < acm->rx_buflimit; i++)
589 usb_kill_urb(acm->read_urbs[i]);
590 usb_kill_urb(acm->ctrlurb);
591 error_submit_urb:
592 usb_autopm_put_interface(acm->control);
593 error_get_interface:
594 disconnected:
595 mutex_unlock(&acm->mutex);
596
597 return usb_translate_errors(retval);
598 }
599
600 static void acm_port_destruct(struct tty_port *port)
601 {
602 struct acm *acm = container_of(port, struct acm, port);
603
604 dev_dbg(&acm->control->dev, "%s\n", __func__);
605
606 acm_release_minor(acm);
607 usb_put_intf(acm->control);
608 kfree(acm->country_codes);
609 kfree(acm);
610 }
611
612 static void acm_port_shutdown(struct tty_port *port)
613 {
614 struct acm *acm = container_of(port, struct acm, port);
615 struct urb *urb;
616 struct acm_wb *wb;
617 int i;
618
619 dev_dbg(&acm->control->dev, "%s\n", __func__);
620
621 /*
622 * Need to grab write_lock to prevent race with resume, but no need to
623 * hold it due to the tty-port initialised flag.
624 */
625 spin_lock_irq(&acm->write_lock);
626 spin_unlock_irq(&acm->write_lock);
627
628 usb_autopm_get_interface_no_resume(acm->control);
629 acm->control->needs_remote_wakeup = 0;
630 usb_autopm_put_interface(acm->control);
631
632 for (;;) {
633 urb = usb_get_from_anchor(&acm->delayed);
634 if (!urb)
635 break;
636 wb = urb->context;
637 wb->use = 0;
638 usb_autopm_put_interface_async(acm->control);
639 }
640
641 usb_kill_urb(acm->ctrlurb);
642 for (i = 0; i < ACM_NW; i++)
643 usb_kill_urb(acm->wb[i].urb);
644 for (i = 0; i < acm->rx_buflimit; i++)
645 usb_kill_urb(acm->read_urbs[i]);
646 }
647
648 static void acm_tty_cleanup(struct tty_struct *tty)
649 {
650 struct acm *acm = tty->driver_data;
651 dev_dbg(&acm->control->dev, "%s\n", __func__);
652 tty_port_put(&acm->port);
653 }
654
655 static void acm_tty_hangup(struct tty_struct *tty)
656 {
657 struct acm *acm = tty->driver_data;
658 dev_dbg(&acm->control->dev, "%s\n", __func__);
659 tty_port_hangup(&acm->port);
660 }
661
662 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
663 {
664 struct acm *acm = tty->driver_data;
665 dev_dbg(&acm->control->dev, "%s\n", __func__);
666 tty_port_close(&acm->port, tty, filp);
667 }
668
669 static int acm_tty_write(struct tty_struct *tty,
670 const unsigned char *buf, int count)
671 {
672 struct acm *acm = tty->driver_data;
673 int stat;
674 unsigned long flags;
675 int wbn;
676 struct acm_wb *wb;
677
678 if (!count)
679 return 0;
680
681 dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
682
683 spin_lock_irqsave(&acm->write_lock, flags);
684 wbn = acm_wb_alloc(acm);
685 if (wbn < 0) {
686 spin_unlock_irqrestore(&acm->write_lock, flags);
687 return 0;
688 }
689 wb = &acm->wb[wbn];
690
691 if (!acm->dev) {
692 wb->use = 0;
693 spin_unlock_irqrestore(&acm->write_lock, flags);
694 return -ENODEV;
695 }
696
697 count = (count > acm->writesize) ? acm->writesize : count;
698 dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
699 memcpy(wb->buf, buf, count);
700 wb->len = count;
701
702 stat = usb_autopm_get_interface_async(acm->control);
703 if (stat) {
704 wb->use = 0;
705 spin_unlock_irqrestore(&acm->write_lock, flags);
706 return stat;
707 }
708
709 if (acm->susp_count) {
710 usb_anchor_urb(wb->urb, &acm->delayed);
711 spin_unlock_irqrestore(&acm->write_lock, flags);
712 return count;
713 }
714
715 stat = acm_start_wb(acm, wb);
716 spin_unlock_irqrestore(&acm->write_lock, flags);
717
718 if (stat < 0)
719 return stat;
720 return count;
721 }
722
723 static int acm_tty_write_room(struct tty_struct *tty)
724 {
725 struct acm *acm = tty->driver_data;
726 /*
727 * Do not let the line discipline to know that we have a reserve,
728 * or it might get too enthusiastic.
729 */
730 return acm_wb_is_avail(acm) ? acm->writesize : 0;
731 }
732
733 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
734 {
735 struct acm *acm = tty->driver_data;
736 /*
737 * if the device was unplugged then any remaining characters fell out
738 * of the connector ;)
739 */
740 if (acm->disconnected)
741 return 0;
742 /*
743 * This is inaccurate (overcounts), but it works.
744 */
745 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
746 }
747
748 static void acm_tty_throttle(struct tty_struct *tty)
749 {
750 struct acm *acm = tty->driver_data;
751
752 spin_lock_irq(&acm->read_lock);
753 acm->throttle_req = 1;
754 spin_unlock_irq(&acm->read_lock);
755 }
756
757 static void acm_tty_unthrottle(struct tty_struct *tty)
758 {
759 struct acm *acm = tty->driver_data;
760 unsigned int was_throttled;
761
762 spin_lock_irq(&acm->read_lock);
763 was_throttled = acm->throttled;
764 acm->throttled = 0;
765 acm->throttle_req = 0;
766 spin_unlock_irq(&acm->read_lock);
767
768 if (was_throttled)
769 acm_submit_read_urbs(acm, GFP_KERNEL);
770 }
771
772 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
773 {
774 struct acm *acm = tty->driver_data;
775 int retval;
776
777 retval = acm_send_break(acm, state ? 0xffff : 0);
778 if (retval < 0)
779 dev_dbg(&acm->control->dev, "%s - send break failed\n",
780 __func__);
781 return retval;
782 }
783
784 static int acm_tty_tiocmget(struct tty_struct *tty)
785 {
786 struct acm *acm = tty->driver_data;
787
788 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
789 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
790 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
791 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
792 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
793 TIOCM_CTS;
794 }
795
796 static int acm_tty_tiocmset(struct tty_struct *tty,
797 unsigned int set, unsigned int clear)
798 {
799 struct acm *acm = tty->driver_data;
800 unsigned int newctrl;
801
802 newctrl = acm->ctrlout;
803 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
804 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
805 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
806 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
807
808 newctrl = (newctrl & ~clear) | set;
809
810 if (acm->ctrlout == newctrl)
811 return 0;
812 return acm_set_control(acm, acm->ctrlout = newctrl);
813 }
814
815 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
816 {
817 struct serial_struct tmp;
818
819 if (!info)
820 return -EINVAL;
821
822 memset(&tmp, 0, sizeof(tmp));
823 tmp.flags = ASYNC_LOW_LATENCY;
824 tmp.xmit_fifo_size = acm->writesize;
825 tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
826 tmp.close_delay = acm->port.close_delay / 10;
827 tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
828 ASYNC_CLOSING_WAIT_NONE :
829 acm->port.closing_wait / 10;
830
831 if (copy_to_user(info, &tmp, sizeof(tmp)))
832 return -EFAULT;
833 else
834 return 0;
835 }
836
837 static int set_serial_info(struct acm *acm,
838 struct serial_struct __user *newinfo)
839 {
840 struct serial_struct new_serial;
841 unsigned int closing_wait, close_delay;
842 int retval = 0;
843
844 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
845 return -EFAULT;
846
847 close_delay = new_serial.close_delay * 10;
848 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
849 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
850
851 mutex_lock(&acm->port.mutex);
852
853 if (!capable(CAP_SYS_ADMIN)) {
854 if ((close_delay != acm->port.close_delay) ||
855 (closing_wait != acm->port.closing_wait))
856 retval = -EPERM;
857 else
858 retval = -EOPNOTSUPP;
859 } else {
860 acm->port.close_delay = close_delay;
861 acm->port.closing_wait = closing_wait;
862 }
863
864 mutex_unlock(&acm->port.mutex);
865 return retval;
866 }
867
868 static int wait_serial_change(struct acm *acm, unsigned long arg)
869 {
870 int rv = 0;
871 DECLARE_WAITQUEUE(wait, current);
872 struct async_icount old, new;
873
874 if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
875 return -EINVAL;
876 do {
877 spin_lock_irq(&acm->read_lock);
878 old = acm->oldcount;
879 new = acm->iocount;
880 acm->oldcount = new;
881 spin_unlock_irq(&acm->read_lock);
882
883 if ((arg & TIOCM_DSR) &&
884 old.dsr != new.dsr)
885 break;
886 if ((arg & TIOCM_CD) &&
887 old.dcd != new.dcd)
888 break;
889 if ((arg & TIOCM_RI) &&
890 old.rng != new.rng)
891 break;
892
893 add_wait_queue(&acm->wioctl, &wait);
894 set_current_state(TASK_INTERRUPTIBLE);
895 schedule();
896 remove_wait_queue(&acm->wioctl, &wait);
897 if (acm->disconnected) {
898 if (arg & TIOCM_CD)
899 break;
900 else
901 rv = -ENODEV;
902 } else {
903 if (signal_pending(current))
904 rv = -ERESTARTSYS;
905 }
906 } while (!rv);
907
908
909
910 return rv;
911 }
912
913 static int get_serial_usage(struct acm *acm,
914 struct serial_icounter_struct __user *count)
915 {
916 struct serial_icounter_struct icount;
917 int rv = 0;
918
919 memset(&icount, 0, sizeof(icount));
920 icount.dsr = acm->iocount.dsr;
921 icount.rng = acm->iocount.rng;
922 icount.dcd = acm->iocount.dcd;
923 icount.frame = acm->iocount.frame;
924 icount.overrun = acm->iocount.overrun;
925 icount.parity = acm->iocount.parity;
926 icount.brk = acm->iocount.brk;
927
928 if (copy_to_user(count, &icount, sizeof(icount)) > 0)
929 rv = -EFAULT;
930
931 return rv;
932 }
933
934 static int acm_tty_ioctl(struct tty_struct *tty,
935 unsigned int cmd, unsigned long arg)
936 {
937 struct acm *acm = tty->driver_data;
938 int rv = -ENOIOCTLCMD;
939
940 switch (cmd) {
941 case TIOCGSERIAL: /* gets serial port data */
942 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
943 break;
944 case TIOCSSERIAL:
945 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
946 break;
947 case TIOCMIWAIT:
948 rv = usb_autopm_get_interface(acm->control);
949 if (rv < 0) {
950 rv = -EIO;
951 break;
952 }
953 rv = wait_serial_change(acm, arg);
954 usb_autopm_put_interface(acm->control);
955 break;
956 case TIOCGICOUNT:
957 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
958 break;
959 }
960
961 return rv;
962 }
963
964 static void acm_tty_set_termios(struct tty_struct *tty,
965 struct ktermios *termios_old)
966 {
967 struct acm *acm = tty->driver_data;
968 struct ktermios *termios = &tty->termios;
969 struct usb_cdc_line_coding newline;
970 int newctrl = acm->ctrlout;
971
972 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
973 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
974 newline.bParityType = termios->c_cflag & PARENB ?
975 (termios->c_cflag & PARODD ? 1 : 2) +
976 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
977 switch (termios->c_cflag & CSIZE) {
978 case CS5:
979 newline.bDataBits = 5;
980 break;
981 case CS6:
982 newline.bDataBits = 6;
983 break;
984 case CS7:
985 newline.bDataBits = 7;
986 break;
987 case CS8:
988 default:
989 newline.bDataBits = 8;
990 break;
991 }
992 /* FIXME: Needs to clear unsupported bits in the termios */
993 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
994
995 if (C_BAUD(tty) == B0) {
996 newline.dwDTERate = acm->line.dwDTERate;
997 newctrl &= ~ACM_CTRL_DTR;
998 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
999 newctrl |= ACM_CTRL_DTR;
1000 }
1001
1002 if (newctrl != acm->ctrlout)
1003 acm_set_control(acm, acm->ctrlout = newctrl);
1004
1005 if (memcmp(&acm->line, &newline, sizeof newline)) {
1006 memcpy(&acm->line, &newline, sizeof newline);
1007 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1008 __func__,
1009 le32_to_cpu(newline.dwDTERate),
1010 newline.bCharFormat, newline.bParityType,
1011 newline.bDataBits);
1012 acm_set_line(acm, &acm->line);
1013 }
1014 }
1015
1016 static const struct tty_port_operations acm_port_ops = {
1017 .dtr_rts = acm_port_dtr_rts,
1018 .shutdown = acm_port_shutdown,
1019 .activate = acm_port_activate,
1020 .destruct = acm_port_destruct,
1021 };
1022
1023 /*
1024 * USB probe and disconnect routines.
1025 */
1026
1027 /* Little helpers: write/read buffers free */
1028 static void acm_write_buffers_free(struct acm *acm)
1029 {
1030 int i;
1031 struct acm_wb *wb;
1032 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1033
1034 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1035 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1036 }
1037
1038 static void acm_read_buffers_free(struct acm *acm)
1039 {
1040 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1041 int i;
1042
1043 for (i = 0; i < acm->rx_buflimit; i++)
1044 usb_free_coherent(usb_dev, acm->readsize,
1045 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1046 }
1047
1048 /* Little helper: write buffers allocate */
1049 static int acm_write_buffers_alloc(struct acm *acm)
1050 {
1051 int i;
1052 struct acm_wb *wb;
1053
1054 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1055 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1056 &wb->dmah);
1057 if (!wb->buf) {
1058 while (i != 0) {
1059 --i;
1060 --wb;
1061 usb_free_coherent(acm->dev, acm->writesize,
1062 wb->buf, wb->dmah);
1063 }
1064 return -ENOMEM;
1065 }
1066 }
1067 return 0;
1068 }
1069
1070 static int acm_probe(struct usb_interface *intf,
1071 const struct usb_device_id *id)
1072 {
1073 struct usb_cdc_union_desc *union_header = NULL;
1074 struct usb_cdc_country_functional_desc *cfd = NULL;
1075 unsigned char *buffer = intf->altsetting->extra;
1076 int buflen = intf->altsetting->extralen;
1077 struct usb_interface *control_interface;
1078 struct usb_interface *data_interface;
1079 struct usb_endpoint_descriptor *epctrl = NULL;
1080 struct usb_endpoint_descriptor *epread = NULL;
1081 struct usb_endpoint_descriptor *epwrite = NULL;
1082 struct usb_device *usb_dev = interface_to_usbdev(intf);
1083 struct acm *acm;
1084 int minor;
1085 int ctrlsize, readsize;
1086 u8 *buf;
1087 u8 ac_management_function = 0;
1088 u8 call_management_function = 0;
1089 int call_interface_num = -1;
1090 int data_interface_num = -1;
1091 unsigned long quirks;
1092 int num_rx_buf;
1093 int i;
1094 unsigned int elength = 0;
1095 int combined_interfaces = 0;
1096 struct device *tty_dev;
1097 int rv = -ENOMEM;
1098
1099 /* normal quirks */
1100 quirks = (unsigned long)id->driver_info;
1101
1102 if (quirks == IGNORE_DEVICE)
1103 return -ENODEV;
1104
1105 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1106
1107 /* handle quirks deadly to normal probing*/
1108 if (quirks == NO_UNION_NORMAL) {
1109 data_interface = usb_ifnum_to_if(usb_dev, 1);
1110 control_interface = usb_ifnum_to_if(usb_dev, 0);
1111 goto skip_normal_probe;
1112 }
1113
1114 /* normal probing*/
1115 if (!buffer) {
1116 dev_err(&intf->dev, "Weird descriptor references\n");
1117 return -EINVAL;
1118 }
1119
1120 if (!buflen) {
1121 if (intf->cur_altsetting->endpoint &&
1122 intf->cur_altsetting->endpoint->extralen &&
1123 intf->cur_altsetting->endpoint->extra) {
1124 dev_dbg(&intf->dev,
1125 "Seeking extra descriptors on endpoint\n");
1126 buflen = intf->cur_altsetting->endpoint->extralen;
1127 buffer = intf->cur_altsetting->endpoint->extra;
1128 } else {
1129 dev_err(&intf->dev,
1130 "Zero length descriptor references\n");
1131 return -EINVAL;
1132 }
1133 }
1134
1135 while (buflen > 0) {
1136 if (buffer[1] != USB_DT_CS_INTERFACE) {
1137 dev_err(&intf->dev, "skipping garbage\n");
1138 goto next_desc;
1139 }
1140 elength = buffer[0];
1141
1142 switch (buffer[2]) {
1143 case USB_CDC_UNION_TYPE: /* we've found it */
1144 if (elength < sizeof(struct usb_cdc_union_desc))
1145 goto next_desc;
1146 if (union_header) {
1147 dev_err(&intf->dev, "More than one "
1148 "union descriptor, skipping ...\n");
1149 goto next_desc;
1150 }
1151 union_header = (struct usb_cdc_union_desc *)buffer;
1152 break;
1153 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1154 if (elength < sizeof(struct usb_cdc_country_functional_desc))
1155 goto next_desc;
1156 cfd = (struct usb_cdc_country_functional_desc *)buffer;
1157 break;
1158 case USB_CDC_HEADER_TYPE: /* maybe check version */
1159 break; /* for now we ignore it */
1160 case USB_CDC_ACM_TYPE:
1161 if (elength < 4)
1162 goto next_desc;
1163 ac_management_function = buffer[3];
1164 break;
1165 case USB_CDC_CALL_MANAGEMENT_TYPE:
1166 if (elength < 5)
1167 goto next_desc;
1168 call_management_function = buffer[3];
1169 call_interface_num = buffer[4];
1170 break;
1171 default:
1172 /*
1173 * there are LOTS more CDC descriptors that
1174 * could legitimately be found here.
1175 */
1176 dev_dbg(&intf->dev, "Ignoring descriptor: "
1177 "type %02x, length %ud\n",
1178 buffer[2], elength);
1179 break;
1180 }
1181 next_desc:
1182 buflen -= elength;
1183 buffer += elength;
1184 }
1185
1186 if (!union_header) {
1187 if (call_interface_num > 0) {
1188 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1189 /* quirks for Droids MuIn LCD */
1190 if (quirks & NO_DATA_INTERFACE)
1191 data_interface = usb_ifnum_to_if(usb_dev, 0);
1192 else
1193 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1194 control_interface = intf;
1195 } else {
1196 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1197 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1198 return -ENODEV;
1199 } else {
1200 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1201 combined_interfaces = 1;
1202 control_interface = data_interface = intf;
1203 goto look_for_collapsed_interface;
1204 }
1205 }
1206 } else {
1207 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1208 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1209 }
1210
1211 if (!control_interface || !data_interface) {
1212 dev_dbg(&intf->dev, "no interfaces\n");
1213 return -ENODEV;
1214 }
1215
1216 if (data_interface_num != call_interface_num)
1217 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1218
1219 if (control_interface == data_interface) {
1220 /* some broken devices designed for windows work this way */
1221 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1222 combined_interfaces = 1;
1223 /* a popular other OS doesn't use it */
1224 quirks |= NO_CAP_LINE;
1225 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1226 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1227 return -EINVAL;
1228 }
1229 look_for_collapsed_interface:
1230 for (i = 0; i < 3; i++) {
1231 struct usb_endpoint_descriptor *ep;
1232 ep = &data_interface->cur_altsetting->endpoint[i].desc;
1233
1234 if (usb_endpoint_is_int_in(ep))
1235 epctrl = ep;
1236 else if (usb_endpoint_is_bulk_out(ep))
1237 epwrite = ep;
1238 else if (usb_endpoint_is_bulk_in(ep))
1239 epread = ep;
1240 else
1241 return -EINVAL;
1242 }
1243 if (!epctrl || !epread || !epwrite)
1244 return -ENODEV;
1245 else
1246 goto made_compressed_probe;
1247 }
1248
1249 skip_normal_probe:
1250
1251 /*workaround for switched interfaces */
1252 if (data_interface->cur_altsetting->desc.bInterfaceClass
1253 != CDC_DATA_INTERFACE_TYPE) {
1254 if (control_interface->cur_altsetting->desc.bInterfaceClass
1255 == CDC_DATA_INTERFACE_TYPE) {
1256 struct usb_interface *t;
1257 dev_dbg(&intf->dev,
1258 "Your device has switched interfaces.\n");
1259 t = control_interface;
1260 control_interface = data_interface;
1261 data_interface = t;
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 struct usb_endpoint_descriptor *t;
1291 dev_dbg(&intf->dev,
1292 "The data interface has switched endpoints\n");
1293 t = epread;
1294 epread = epwrite;
1295 epwrite = t;
1296 }
1297 made_compressed_probe:
1298 dev_dbg(&intf->dev, "interfaces are valid\n");
1299
1300 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1301 if (acm == NULL)
1302 goto alloc_fail;
1303
1304 minor = acm_alloc_minor(acm);
1305 if (minor == ACM_TTY_MINORS) {
1306 dev_err(&intf->dev, "no more free acm devices\n");
1307 kfree(acm);
1308 return -ENODEV;
1309 }
1310
1311 ctrlsize = usb_endpoint_maxp(epctrl);
1312 readsize = usb_endpoint_maxp(epread) *
1313 (quirks == SINGLE_RX_URB ? 1 : 2);
1314 acm->combined_interfaces = combined_interfaces;
1315 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1316 acm->control = control_interface;
1317 acm->data = data_interface;
1318 acm->minor = minor;
1319 acm->dev = usb_dev;
1320 acm->ctrl_caps = ac_management_function;
1321 if (quirks & NO_CAP_LINE)
1322 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1323 acm->ctrlsize = ctrlsize;
1324 acm->readsize = readsize;
1325 acm->rx_buflimit = num_rx_buf;
1326 INIT_WORK(&acm->work, acm_softint);
1327 init_waitqueue_head(&acm->wioctl);
1328 spin_lock_init(&acm->write_lock);
1329 spin_lock_init(&acm->read_lock);
1330 mutex_init(&acm->mutex);
1331 acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1332 acm->is_int_ep = usb_endpoint_xfer_int(epread);
1333 if (acm->is_int_ep)
1334 acm->bInterval = epread->bInterval;
1335 tty_port_init(&acm->port);
1336 acm->port.ops = &acm_port_ops;
1337 init_usb_anchor(&acm->delayed);
1338 acm->quirks = quirks;
1339
1340 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1341 if (!buf)
1342 goto alloc_fail2;
1343 acm->ctrl_buffer = buf;
1344
1345 if (acm_write_buffers_alloc(acm) < 0)
1346 goto alloc_fail4;
1347
1348 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1349 if (!acm->ctrlurb)
1350 goto alloc_fail5;
1351
1352 for (i = 0; i < num_rx_buf; i++) {
1353 struct acm_rb *rb = &(acm->read_buffers[i]);
1354 struct urb *urb;
1355
1356 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1357 &rb->dma);
1358 if (!rb->base)
1359 goto alloc_fail6;
1360 rb->index = i;
1361 rb->instance = acm;
1362
1363 urb = usb_alloc_urb(0, GFP_KERNEL);
1364 if (!urb)
1365 goto alloc_fail6;
1366
1367 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1368 urb->transfer_dma = rb->dma;
1369 if (acm->is_int_ep) {
1370 usb_fill_int_urb(urb, acm->dev,
1371 acm->rx_endpoint,
1372 rb->base,
1373 acm->readsize,
1374 acm_read_bulk_callback, rb,
1375 acm->bInterval);
1376 } else {
1377 usb_fill_bulk_urb(urb, acm->dev,
1378 acm->rx_endpoint,
1379 rb->base,
1380 acm->readsize,
1381 acm_read_bulk_callback, rb);
1382 }
1383
1384 acm->read_urbs[i] = urb;
1385 __set_bit(i, &acm->read_urbs_free);
1386 }
1387 for (i = 0; i < ACM_NW; i++) {
1388 struct acm_wb *snd = &(acm->wb[i]);
1389
1390 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1391 if (snd->urb == NULL)
1392 goto alloc_fail7;
1393
1394 if (usb_endpoint_xfer_int(epwrite))
1395 usb_fill_int_urb(snd->urb, usb_dev,
1396 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1397 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1398 else
1399 usb_fill_bulk_urb(snd->urb, usb_dev,
1400 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1401 NULL, acm->writesize, acm_write_bulk, snd);
1402 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1403 snd->instance = acm;
1404 }
1405
1406 usb_set_intfdata(intf, acm);
1407
1408 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1409 if (i < 0)
1410 goto alloc_fail7;
1411
1412 if (cfd) { /* export the country data */
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
1449 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1450
1451 acm->line.dwDTERate = cpu_to_le32(9600);
1452 acm->line.bDataBits = 8;
1453 acm_set_line(acm, &acm->line);
1454
1455 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1456 usb_set_intfdata(data_interface, acm);
1457
1458 usb_get_intf(control_interface);
1459 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1460 &control_interface->dev);
1461 if (IS_ERR(tty_dev)) {
1462 rv = PTR_ERR(tty_dev);
1463 goto alloc_fail8;
1464 }
1465
1466 return 0;
1467 alloc_fail8:
1468 if (acm->country_codes) {
1469 device_remove_file(&acm->control->dev,
1470 &dev_attr_wCountryCodes);
1471 device_remove_file(&acm->control->dev,
1472 &dev_attr_iCountryCodeRelDate);
1473 kfree(acm->country_codes);
1474 }
1475 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1476 alloc_fail7:
1477 usb_set_intfdata(intf, NULL);
1478 for (i = 0; i < ACM_NW; i++)
1479 usb_free_urb(acm->wb[i].urb);
1480 alloc_fail6:
1481 for (i = 0; i < num_rx_buf; i++)
1482 usb_free_urb(acm->read_urbs[i]);
1483 acm_read_buffers_free(acm);
1484 usb_free_urb(acm->ctrlurb);
1485 alloc_fail5:
1486 acm_write_buffers_free(acm);
1487 alloc_fail4:
1488 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1489 alloc_fail2:
1490 acm_release_minor(acm);
1491 kfree(acm);
1492 alloc_fail:
1493 return rv;
1494 }
1495
1496 static void stop_data_traffic(struct acm *acm)
1497 {
1498 int i;
1499
1500 dev_dbg(&acm->control->dev, "%s\n", __func__);
1501
1502 usb_kill_urb(acm->ctrlurb);
1503 for (i = 0; i < ACM_NW; i++)
1504 usb_kill_urb(acm->wb[i].urb);
1505 for (i = 0; i < acm->rx_buflimit; i++)
1506 usb_kill_urb(acm->read_urbs[i]);
1507
1508 cancel_work_sync(&acm->work);
1509 }
1510
1511 static void acm_disconnect(struct usb_interface *intf)
1512 {
1513 struct acm *acm = usb_get_intfdata(intf);
1514 struct usb_device *usb_dev = interface_to_usbdev(intf);
1515 struct tty_struct *tty;
1516 int i;
1517
1518 dev_dbg(&intf->dev, "%s\n", __func__);
1519
1520 /* sibling interface is already cleaning up */
1521 if (!acm)
1522 return;
1523
1524 mutex_lock(&acm->mutex);
1525 acm->disconnected = true;
1526 if (acm->country_codes) {
1527 device_remove_file(&acm->control->dev,
1528 &dev_attr_wCountryCodes);
1529 device_remove_file(&acm->control->dev,
1530 &dev_attr_iCountryCodeRelDate);
1531 }
1532 wake_up_all(&acm->wioctl);
1533 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1534 usb_set_intfdata(acm->control, NULL);
1535 usb_set_intfdata(acm->data, NULL);
1536 mutex_unlock(&acm->mutex);
1537
1538 tty = tty_port_tty_get(&acm->port);
1539 if (tty) {
1540 tty_vhangup(tty);
1541 tty_kref_put(tty);
1542 }
1543
1544 stop_data_traffic(acm);
1545
1546 tty_unregister_device(acm_tty_driver, acm->minor);
1547
1548 usb_free_urb(acm->ctrlurb);
1549 for (i = 0; i < ACM_NW; i++)
1550 usb_free_urb(acm->wb[i].urb);
1551 for (i = 0; i < acm->rx_buflimit; i++)
1552 usb_free_urb(acm->read_urbs[i]);
1553 acm_write_buffers_free(acm);
1554 usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1555 acm_read_buffers_free(acm);
1556
1557 if (!acm->combined_interfaces)
1558 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1559 acm->data : acm->control);
1560
1561 tty_port_put(&acm->port);
1562 }
1563
1564 #ifdef CONFIG_PM
1565 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1566 {
1567 struct acm *acm = usb_get_intfdata(intf);
1568 int cnt;
1569
1570 spin_lock_irq(&acm->write_lock);
1571 if (PMSG_IS_AUTO(message)) {
1572 if (acm->transmitting) {
1573 spin_unlock_irq(&acm->write_lock);
1574 return -EBUSY;
1575 }
1576 }
1577 cnt = acm->susp_count++;
1578 spin_unlock_irq(&acm->write_lock);
1579
1580 if (cnt)
1581 return 0;
1582
1583 stop_data_traffic(acm);
1584
1585 return 0;
1586 }
1587
1588 static int acm_resume(struct usb_interface *intf)
1589 {
1590 struct acm *acm = usb_get_intfdata(intf);
1591 struct urb *urb;
1592 int rv = 0;
1593
1594 spin_lock_irq(&acm->write_lock);
1595
1596 if (--acm->susp_count)
1597 goto out;
1598
1599 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1600 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1601
1602 for (;;) {
1603 urb = usb_get_from_anchor(&acm->delayed);
1604 if (!urb)
1605 break;
1606
1607 acm_start_wb(acm, urb->context);
1608 }
1609
1610 /*
1611 * delayed error checking because we must
1612 * do the write path at all cost
1613 */
1614 if (rv < 0)
1615 goto out;
1616
1617 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1618 }
1619 out:
1620 spin_unlock_irq(&acm->write_lock);
1621
1622 return rv;
1623 }
1624
1625 static int acm_reset_resume(struct usb_interface *intf)
1626 {
1627 struct acm *acm = usb_get_intfdata(intf);
1628
1629 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1630 tty_port_tty_hangup(&acm->port, false);
1631
1632 return acm_resume(intf);
1633 }
1634
1635 #endif /* CONFIG_PM */
1636
1637 #define NOKIA_PCSUITE_ACM_INFO(x) \
1638 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1639 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1640 USB_CDC_ACM_PROTO_VENDOR)
1641
1642 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1643 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1644 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1645 USB_CDC_ACM_PROTO_VENDOR)
1646
1647 /*
1648 * USB driver structure.
1649 */
1650
1651 static const struct usb_device_id acm_ids[] = {
1652 /* quirky and broken devices */
1653 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1654 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1655 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1656 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1657 },
1658 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1659 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1660 },
1661 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1662 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1663 },
1664 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1665 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1666 },
1667 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1668 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1669 },
1670 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1671 .driver_info = SINGLE_RX_URB,
1672 },
1673 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1674 .driver_info = SINGLE_RX_URB, /* firmware bug */
1675 },
1676 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1677 .driver_info = SINGLE_RX_URB, /* firmware bug */
1678 },
1679 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1680 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1681 },
1682 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1683 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1684 },
1685 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1686 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1687 },
1688 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1689 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1690 },
1691 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1692 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1693 },
1694 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1695 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1696 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1697 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1698 },
1699 /* Motorola H24 HSPA module: */
1700 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1701 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1702 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1703 },
1704 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1705 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1706 },
1707 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1708 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1709 },
1710 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1711 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1712 },
1713 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1714 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1715 },
1716 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1717 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1718 },
1719 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1720 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1721 },
1722
1723 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1724 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1725 data interface instead of
1726 communications interface.
1727 Maybe we should define a new
1728 quirk for this. */
1729 },
1730 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1731 .driver_info = NO_UNION_NORMAL,
1732 },
1733 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1734 .driver_info = NO_UNION_NORMAL,
1735 },
1736 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1737 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1738 },
1739 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1740 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1741 },
1742
1743 /* Nokia S60 phones expose two ACM channels. The first is
1744 * a modem and is picked up by the standard AT-command
1745 * information below. The second is 'vendor-specific' but
1746 * is treated as a serial device at the S60 end, so we want
1747 * to expose it on Linux too. */
1748 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1749 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1750 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1751 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1752 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1753 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1754 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1755 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1756 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1757 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1758 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1759 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1760 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1761 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1762 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1763 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1764 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1765 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1766 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1767 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1768 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1769 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1770 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1771 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1772 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1773 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1774 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1775 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1776 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1777 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1778 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1779 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1780 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1781 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1782 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1783 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1784 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1785 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1786 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1787 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1788 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1789 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1790 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1791 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1792 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1793 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1794 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1795 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1796 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1797 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1798 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1799 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1800 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1801 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1802 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1803 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1804 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1805 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1806
1807 /* Support for Owen devices */
1808 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1809
1810 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1811
1812 /* Support for Droids MuIn LCD */
1813 { USB_DEVICE(0x04d8, 0x000b),
1814 .driver_info = NO_DATA_INTERFACE,
1815 },
1816
1817 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1818 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1819 .driver_info = IGNORE_DEVICE,
1820 },
1821 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1822 .driver_info = IGNORE_DEVICE,
1823 },
1824 #endif
1825
1826 /* control interfaces without any protocol set */
1827 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1828 USB_CDC_PROTO_NONE) },
1829
1830 /* control interfaces with various AT-command sets */
1831 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1832 USB_CDC_ACM_PROTO_AT_V25TER) },
1833 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1834 USB_CDC_ACM_PROTO_AT_PCCA101) },
1835 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1836 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1837 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1838 USB_CDC_ACM_PROTO_AT_GSM) },
1839 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1840 USB_CDC_ACM_PROTO_AT_3G) },
1841 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1842 USB_CDC_ACM_PROTO_AT_CDMA) },
1843
1844 { }
1845 };
1846
1847 MODULE_DEVICE_TABLE(usb, acm_ids);
1848
1849 static struct usb_driver acm_driver = {
1850 .name = "cdc_acm",
1851 .probe = acm_probe,
1852 .disconnect = acm_disconnect,
1853 #ifdef CONFIG_PM
1854 .suspend = acm_suspend,
1855 .resume = acm_resume,
1856 .reset_resume = acm_reset_resume,
1857 #endif
1858 .id_table = acm_ids,
1859 #ifdef CONFIG_PM
1860 .supports_autosuspend = 1,
1861 #endif
1862 .disable_hub_initiated_lpm = 1,
1863 };
1864
1865 /*
1866 * TTY driver structures.
1867 */
1868
1869 static const struct tty_operations acm_ops = {
1870 .install = acm_tty_install,
1871 .open = acm_tty_open,
1872 .close = acm_tty_close,
1873 .cleanup = acm_tty_cleanup,
1874 .hangup = acm_tty_hangup,
1875 .write = acm_tty_write,
1876 .write_room = acm_tty_write_room,
1877 .ioctl = acm_tty_ioctl,
1878 .throttle = acm_tty_throttle,
1879 .unthrottle = acm_tty_unthrottle,
1880 .chars_in_buffer = acm_tty_chars_in_buffer,
1881 .break_ctl = acm_tty_break_ctl,
1882 .set_termios = acm_tty_set_termios,
1883 .tiocmget = acm_tty_tiocmget,
1884 .tiocmset = acm_tty_tiocmset,
1885 };
1886
1887 /*
1888 * Init / exit.
1889 */
1890
1891 static int __init acm_init(void)
1892 {
1893 int retval;
1894 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1895 if (!acm_tty_driver)
1896 return -ENOMEM;
1897 acm_tty_driver->driver_name = "acm",
1898 acm_tty_driver->name = "ttyACM",
1899 acm_tty_driver->major = ACM_TTY_MAJOR,
1900 acm_tty_driver->minor_start = 0,
1901 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1902 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1903 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1904 acm_tty_driver->init_termios = tty_std_termios;
1905 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1906 HUPCL | CLOCAL;
1907 tty_set_operations(acm_tty_driver, &acm_ops);
1908
1909 retval = tty_register_driver(acm_tty_driver);
1910 if (retval) {
1911 put_tty_driver(acm_tty_driver);
1912 return retval;
1913 }
1914
1915 retval = usb_register(&acm_driver);
1916 if (retval) {
1917 tty_unregister_driver(acm_tty_driver);
1918 put_tty_driver(acm_tty_driver);
1919 return retval;
1920 }
1921
1922 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1923
1924 return 0;
1925 }
1926
1927 static void __exit acm_exit(void)
1928 {
1929 usb_deregister(&acm_driver);
1930 tty_unregister_driver(acm_tty_driver);
1931 put_tty_driver(acm_tty_driver);
1932 }
1933
1934 module_init(acm_init);
1935 module_exit(acm_exit);
1936
1937 MODULE_AUTHOR(DRIVER_AUTHOR);
1938 MODULE_DESCRIPTION(DRIVER_DESC);
1939 MODULE_LICENSE("GPL");
1940 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
Linux kernel - Deliverables
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