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1/*
2 * cdc-acm.c
3 *
4 * Copyright (c) 1999 Armin Fuerst <fuerst@in.tum.de>
5 * Copyright (c) 1999 Pavel Machek <pavel@ucw.cz>
6 * Copyright (c) 1999 Johannes Erdfelt <johannes@erdfelt.com>
7 * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz>
8 * Copyright (c) 2004 Oliver Neukum <oliver@neukum.name>
9 * Copyright (c) 2005 David Kubicek <dave@awk.cz>
10 * Copyright (c) 2011 Johan Hovold <jhovold@gmail.com>
11 *
12 * USB Abstract Control Model driver for USB modems and ISDN adapters
13 *
14 * Sponsored by SuSE
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 */
30
31#undef DEBUG
32#undef VERBOSE_DEBUG
33
34#include <linux/kernel.h>
35#include <linux/errno.h>
36#include <linux/init.h>
37#include <linux/slab.h>
38#include <linux/tty.h>
39#include <linux/serial.h>
40#include <linux/tty_driver.h>
41#include <linux/tty_flip.h>
42#include <linux/serial.h>
43#include <linux/module.h>
44#include <linux/mutex.h>
45#include <linux/uaccess.h>
46#include <linux/usb.h>
47#include <linux/usb/cdc.h>
48#include <asm/byteorder.h>
49#include <asm/unaligned.h>
50#include <linux/list.h>
51
52#include "cdc-acm.h"
53
54
55#define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
56#define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
57
58static struct usb_driver acm_driver;
59static struct tty_driver *acm_tty_driver;
60static struct acm *acm_table[ACM_TTY_MINORS];
61
62static DEFINE_MUTEX(acm_table_lock);
63
64/*
65 * acm_table accessors
66 */
67
68/*
69 * Look up an ACM structure by index. If found and not disconnected, increment
70 * its refcount and return it with its mutex held.
71 */
72static struct acm *acm_get_by_index(unsigned index)
73{
74 struct acm *acm;
75
76 mutex_lock(&acm_table_lock);
77 acm = acm_table[index];
78 if (acm) {
79 mutex_lock(&acm->mutex);
80 if (acm->disconnected) {
81 mutex_unlock(&acm->mutex);
82 acm = NULL;
83 } else {
84 tty_port_get(&acm->port);
85 mutex_unlock(&acm->mutex);
86 }
87 }
88 mutex_unlock(&acm_table_lock);
89 return acm;
90}
91
92/*
93 * Try to find an available minor number and if found, associate it with 'acm'.
94 */
95static int acm_alloc_minor(struct acm *acm)
96{
97 int minor;
98
99 mutex_lock(&acm_table_lock);
100 for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
101 if (!acm_table[minor]) {
102 acm_table[minor] = acm;
103 break;
104 }
105 }
106 mutex_unlock(&acm_table_lock);
107
108 return minor;
109}
110
111/* Release the minor number associated with 'acm'. */
112static void acm_release_minor(struct acm *acm)
113{
114 mutex_lock(&acm_table_lock);
115 acm_table[acm->minor] = NULL;
116 mutex_unlock(&acm_table_lock);
117}
118
119/*
120 * Functions for ACM control messages.
121 */
122
123static int acm_ctrl_msg(struct acm *acm, int request, int value,
124 void *buf, int len)
125{
126 int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
127 request, USB_RT_ACM, value,
128 acm->control->altsetting[0].desc.bInterfaceNumber,
129 buf, len, 5000);
130 dev_dbg(&acm->control->dev,
131 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
132 __func__, request, value, len, retval);
133 return retval < 0 ? retval : 0;
134}
135
136/* devices aren't required to support these requests.
137 * the cdc acm descriptor tells whether they do...
138 */
139#define acm_set_control(acm, control) \
140 acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
141#define acm_set_line(acm, line) \
142 acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
143#define acm_send_break(acm, ms) \
144 acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
145
146/*
147 * Write buffer management.
148 * All of these assume proper locks taken by the caller.
149 */
150
151static int acm_wb_alloc(struct acm *acm)
152{
153 int i, wbn;
154 struct acm_wb *wb;
155
156 wbn = 0;
157 i = 0;
158 for (;;) {
159 wb = &acm->wb[wbn];
160 if (!wb->use) {
161 wb->use = 1;
162 return wbn;
163 }
164 wbn = (wbn + 1) % ACM_NW;
165 if (++i >= ACM_NW)
166 return -1;
167 }
168}
169
170static int acm_wb_is_avail(struct acm *acm)
171{
172 int i, n;
173 unsigned long flags;
174
175 n = ACM_NW;
176 spin_lock_irqsave(&acm->write_lock, flags);
177 for (i = 0; i < ACM_NW; i++)
178 n -= acm->wb[i].use;
179 spin_unlock_irqrestore(&acm->write_lock, flags);
180 return n;
181}
182
183/*
184 * Finish write. Caller must hold acm->write_lock
185 */
186static void acm_write_done(struct acm *acm, struct acm_wb *wb)
187{
188 wb->use = 0;
189 acm->transmitting--;
190 usb_autopm_put_interface_async(acm->control);
191}
192
193/*
194 * Poke write.
195 *
196 * the caller is responsible for locking
197 */
198
199static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
200{
201 int rc;
202
203 acm->transmitting++;
204
205 wb->urb->transfer_buffer = wb->buf;
206 wb->urb->transfer_dma = wb->dmah;
207 wb->urb->transfer_buffer_length = wb->len;
208 wb->urb->dev = acm->dev;
209
210 rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
211 if (rc < 0) {
212 dev_err(&acm->data->dev,
213 "%s - usb_submit_urb(write bulk) failed: %d\n",
214 __func__, rc);
215 acm_write_done(acm, wb);
216 }
217 return rc;
218}
219
220static int acm_write_start(struct acm *acm, int wbn)
221{
222 unsigned long flags;
223 struct acm_wb *wb = &acm->wb[wbn];
224 int rc;
225
226 spin_lock_irqsave(&acm->write_lock, flags);
227 if (!acm->dev) {
228 wb->use = 0;
229 spin_unlock_irqrestore(&acm->write_lock, flags);
230 return -ENODEV;
231 }
232
233 dev_vdbg(&acm->data->dev, "%s - susp_count %d\n", __func__,
234 acm->susp_count);
235 usb_autopm_get_interface_async(acm->control);
236 if (acm->susp_count) {
237 if (!acm->delayed_wb)
238 acm->delayed_wb = wb;
239 else
240 usb_autopm_put_interface_async(acm->control);
241 spin_unlock_irqrestore(&acm->write_lock, flags);
242 return 0; /* A white lie */
243 }
244 usb_mark_last_busy(acm->dev);
245
246 rc = acm_start_wb(acm, wb);
247 spin_unlock_irqrestore(&acm->write_lock, flags);
248
249 return rc;
250
251}
252/*
253 * attributes exported through sysfs
254 */
255static ssize_t show_caps
256(struct device *dev, struct device_attribute *attr, char *buf)
257{
258 struct usb_interface *intf = to_usb_interface(dev);
259 struct acm *acm = usb_get_intfdata(intf);
260
261 return sprintf(buf, "%d", acm->ctrl_caps);
262}
263static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
264
265static ssize_t show_country_codes
266(struct device *dev, struct device_attribute *attr, char *buf)
267{
268 struct usb_interface *intf = to_usb_interface(dev);
269 struct acm *acm = usb_get_intfdata(intf);
270
271 memcpy(buf, acm->country_codes, acm->country_code_size);
272 return acm->country_code_size;
273}
274
275static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
276
277static ssize_t show_country_rel_date
278(struct device *dev, struct device_attribute *attr, char *buf)
279{
280 struct usb_interface *intf = to_usb_interface(dev);
281 struct acm *acm = usb_get_intfdata(intf);
282
283 return sprintf(buf, "%d", acm->country_rel_date);
284}
285
286static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
287/*
288 * Interrupt handlers for various ACM device responses
289 */
290
291/* control interface reports status changes with "interrupt" transfers */
292static void acm_ctrl_irq(struct urb *urb)
293{
294 struct acm *acm = urb->context;
295 struct usb_cdc_notification *dr = urb->transfer_buffer;
296 struct tty_struct *tty;
297 unsigned char *data;
298 int newctrl;
299 int retval;
300 int status = urb->status;
301
302 switch (status) {
303 case 0:
304 /* success */
305 break;
306 case -ECONNRESET:
307 case -ENOENT:
308 case -ESHUTDOWN:
309 /* this urb is terminated, clean up */
310 dev_dbg(&acm->control->dev,
311 "%s - urb shutting down with status: %d\n",
312 __func__, status);
313 return;
314 default:
315 dev_dbg(&acm->control->dev,
316 "%s - nonzero urb status received: %d\n",
317 __func__, status);
318 goto exit;
319 }
320
321 usb_mark_last_busy(acm->dev);
322
323 data = (unsigned char *)(dr + 1);
324 switch (dr->bNotificationType) {
325 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
326 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
327 __func__, dr->wValue);
328 break;
329
330 case USB_CDC_NOTIFY_SERIAL_STATE:
331 tty = tty_port_tty_get(&acm->port);
332 newctrl = get_unaligned_le16(data);
333
334 if (tty) {
335 if (!acm->clocal &&
336 (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
337 dev_dbg(&acm->control->dev,
338 "%s - calling hangup\n", __func__);
339 tty_hangup(tty);
340 }
341 tty_kref_put(tty);
342 }
343
344 acm->ctrlin = newctrl;
345
346 dev_dbg(&acm->control->dev,
347 "%s - input control lines: dcd%c dsr%c break%c "
348 "ring%c framing%c parity%c overrun%c\n",
349 __func__,
350 acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
351 acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
352 acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
353 acm->ctrlin & ACM_CTRL_RI ? '+' : '-',
354 acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
355 acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
356 acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
357 break;
358
359 default:
360 dev_dbg(&acm->control->dev,
361 "%s - unknown notification %d received: index %d "
362 "len %d data0 %d data1 %d\n",
363 __func__,
364 dr->bNotificationType, dr->wIndex,
365 dr->wLength, data[0], data[1]);
366 break;
367 }
368exit:
369 retval = usb_submit_urb(urb, GFP_ATOMIC);
370 if (retval)
371 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
372 __func__, retval);
373}
374
375static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
376{
377 int res;
378
379 if (!test_and_clear_bit(index, &acm->read_urbs_free))
380 return 0;
381
382 dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
383
384 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
385 if (res) {
386 if (res != -EPERM) {
387 dev_err(&acm->data->dev,
388 "%s - usb_submit_urb failed: %d\n",
389 __func__, res);
390 }
391 set_bit(index, &acm->read_urbs_free);
392 return res;
393 }
394
395 return 0;
396}
397
398static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
399{
400 int res;
401 int i;
402
403 for (i = 0; i < acm->rx_buflimit; ++i) {
404 res = acm_submit_read_urb(acm, i, mem_flags);
405 if (res)
406 return res;
407 }
408
409 return 0;
410}
411
412static void acm_process_read_urb(struct acm *acm, struct urb *urb)
413{
414 struct tty_struct *tty;
415
416 if (!urb->actual_length)
417 return;
418
419 tty = tty_port_tty_get(&acm->port);
420 if (!tty)
421 return;
422
423 tty_insert_flip_string(tty, urb->transfer_buffer, urb->actual_length);
424 tty_flip_buffer_push(tty);
425
426 tty_kref_put(tty);
427}
428
429static void acm_read_bulk_callback(struct urb *urb)
430{
431 struct acm_rb *rb = urb->context;
432 struct acm *acm = rb->instance;
433 unsigned long flags;
434
435 dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
436 rb->index, urb->actual_length);
437 set_bit(rb->index, &acm->read_urbs_free);
438
439 if (!acm->dev) {
440 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
441 return;
442 }
443 usb_mark_last_busy(acm->dev);
444
445 if (urb->status) {
446 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
447 __func__, urb->status);
448 return;
449 }
450 acm_process_read_urb(acm, urb);
451
452 /* throttle device if requested by tty */
453 spin_lock_irqsave(&acm->read_lock, flags);
454 acm->throttled = acm->throttle_req;
455 if (!acm->throttled && !acm->susp_count) {
456 spin_unlock_irqrestore(&acm->read_lock, flags);
457 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
458 } else {
459 spin_unlock_irqrestore(&acm->read_lock, flags);
460 }
461}
462
463/* data interface wrote those outgoing bytes */
464static void acm_write_bulk(struct urb *urb)
465{
466 struct acm_wb *wb = urb->context;
467 struct acm *acm = wb->instance;
468 unsigned long flags;
469
470 if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
471 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
472 __func__,
473 urb->actual_length,
474 urb->transfer_buffer_length,
475 urb->status);
476
477 spin_lock_irqsave(&acm->write_lock, flags);
478 acm_write_done(acm, wb);
479 spin_unlock_irqrestore(&acm->write_lock, flags);
480 schedule_work(&acm->work);
481}
482
483static void acm_softint(struct work_struct *work)
484{
485 struct acm *acm = container_of(work, struct acm, work);
486 struct tty_struct *tty;
487
488 dev_vdbg(&acm->data->dev, "%s\n", __func__);
489
490 tty = tty_port_tty_get(&acm->port);
491 if (!tty)
492 return;
493 tty_wakeup(tty);
494 tty_kref_put(tty);
495}
496
497/*
498 * TTY handlers
499 */
500
501static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
502{
503 struct acm *acm;
504 int retval;
505
506 dev_dbg(tty->dev, "%s\n", __func__);
507
508 acm = acm_get_by_index(tty->index);
509 if (!acm)
510 return -ENODEV;
511
512 retval = tty_standard_install(driver, tty);
513 if (retval)
514 goto error_init_termios;
515
516 tty->driver_data = acm;
517
518 return 0;
519
520error_init_termios:
521 tty_port_put(&acm->port);
522 return retval;
523}
524
525static int acm_tty_open(struct tty_struct *tty, struct file *filp)
526{
527 struct acm *acm = tty->driver_data;
528
529 dev_dbg(tty->dev, "%s\n", __func__);
530
531 return tty_port_open(&acm->port, tty, filp);
532}
533
534static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
535{
536 struct acm *acm = container_of(port, struct acm, port);
537 int retval = -ENODEV;
538
539 dev_dbg(&acm->control->dev, "%s\n", __func__);
540
541 mutex_lock(&acm->mutex);
542 if (acm->disconnected)
543 goto disconnected;
544
545 retval = usb_autopm_get_interface(acm->control);
546 if (retval)
547 goto error_get_interface;
548
549 /*
550 * FIXME: Why do we need this? Allocating 64K of physically contiguous
551 * memory is really nasty...
552 */
553 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
554 acm->control->needs_remote_wakeup = 1;
555
556 acm->ctrlurb->dev = acm->dev;
557 if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
558 dev_err(&acm->control->dev,
559 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
560 goto error_submit_urb;
561 }
562
563 acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
564 if (acm_set_control(acm, acm->ctrlout) < 0 &&
565 (acm->ctrl_caps & USB_CDC_CAP_LINE))
566 goto error_set_control;
567
568 usb_autopm_put_interface(acm->control);
569
570 /*
571 * Unthrottle device in case the TTY was closed while throttled.
572 */
573 spin_lock_irq(&acm->read_lock);
574 acm->throttled = 0;
575 acm->throttle_req = 0;
576 spin_unlock_irq(&acm->read_lock);
577
578 if (acm_submit_read_urbs(acm, GFP_KERNEL))
579 goto error_submit_read_urbs;
580
581 mutex_unlock(&acm->mutex);
582
583 return 0;
584
585error_submit_read_urbs:
586 acm->ctrlout = 0;
587 acm_set_control(acm, acm->ctrlout);
588error_set_control:
589 usb_kill_urb(acm->ctrlurb);
590error_submit_urb:
591 usb_autopm_put_interface(acm->control);
592error_get_interface:
593disconnected:
594 mutex_unlock(&acm->mutex);
595 return retval;
596}
597
598static void acm_port_destruct(struct tty_port *port)
599{
600 struct acm *acm = container_of(port, struct acm, port);
601
602 dev_dbg(&acm->control->dev, "%s\n", __func__);
603
604 tty_unregister_device(acm_tty_driver, acm->minor);
605 acm_release_minor(acm);
606 usb_put_intf(acm->control);
607 kfree(acm->country_codes);
608 kfree(acm);
609}
610
611static void acm_port_shutdown(struct tty_port *port)
612{
613 struct acm *acm = container_of(port, struct acm, port);
614 int i;
615
616 dev_dbg(&acm->control->dev, "%s\n", __func__);
617
618 mutex_lock(&acm->mutex);
619 if (!acm->disconnected) {
620 usb_autopm_get_interface(acm->control);
621 acm_set_control(acm, acm->ctrlout = 0);
622 usb_kill_urb(acm->ctrlurb);
623 for (i = 0; i < ACM_NW; i++)
624 usb_kill_urb(acm->wb[i].urb);
625 for (i = 0; i < acm->rx_buflimit; i++)
626 usb_kill_urb(acm->read_urbs[i]);
627 acm->control->needs_remote_wakeup = 0;
628 usb_autopm_put_interface(acm->control);
629 }
630 mutex_unlock(&acm->mutex);
631}
632
633static void acm_tty_cleanup(struct tty_struct *tty)
634{
635 struct acm *acm = tty->driver_data;
636 dev_dbg(&acm->control->dev, "%s\n", __func__);
637 tty_port_put(&acm->port);
638}
639
640static void acm_tty_hangup(struct tty_struct *tty)
641{
642 struct acm *acm = tty->driver_data;
643 dev_dbg(&acm->control->dev, "%s\n", __func__);
644 tty_port_hangup(&acm->port);
645}
646
647static void acm_tty_close(struct tty_struct *tty, struct file *filp)
648{
649 struct acm *acm = tty->driver_data;
650 dev_dbg(&acm->control->dev, "%s\n", __func__);
651 tty_port_close(&acm->port, tty, filp);
652}
653
654static int acm_tty_write(struct tty_struct *tty,
655 const unsigned char *buf, int count)
656{
657 struct acm *acm = tty->driver_data;
658 int stat;
659 unsigned long flags;
660 int wbn;
661 struct acm_wb *wb;
662
663 if (!count)
664 return 0;
665
666 dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
667
668 spin_lock_irqsave(&acm->write_lock, flags);
669 wbn = acm_wb_alloc(acm);
670 if (wbn < 0) {
671 spin_unlock_irqrestore(&acm->write_lock, flags);
672 return 0;
673 }
674 wb = &acm->wb[wbn];
675
676 count = (count > acm->writesize) ? acm->writesize : count;
677 dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
678 memcpy(wb->buf, buf, count);
679 wb->len = count;
680 spin_unlock_irqrestore(&acm->write_lock, flags);
681
682 stat = acm_write_start(acm, wbn);
683 if (stat < 0)
684 return stat;
685 return count;
686}
687
688static int acm_tty_write_room(struct tty_struct *tty)
689{
690 struct acm *acm = tty->driver_data;
691 /*
692 * Do not let the line discipline to know that we have a reserve,
693 * or it might get too enthusiastic.
694 */
695 return acm_wb_is_avail(acm) ? acm->writesize : 0;
696}
697
698static int acm_tty_chars_in_buffer(struct tty_struct *tty)
699{
700 struct acm *acm = tty->driver_data;
701 /*
702 * if the device was unplugged then any remaining characters fell out
703 * of the connector ;)
704 */
705 if (acm->disconnected)
706 return 0;
707 /*
708 * This is inaccurate (overcounts), but it works.
709 */
710 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
711}
712
713static void acm_tty_throttle(struct tty_struct *tty)
714{
715 struct acm *acm = tty->driver_data;
716
717 spin_lock_irq(&acm->read_lock);
718 acm->throttle_req = 1;
719 spin_unlock_irq(&acm->read_lock);
720}
721
722static void acm_tty_unthrottle(struct tty_struct *tty)
723{
724 struct acm *acm = tty->driver_data;
725 unsigned int was_throttled;
726
727 spin_lock_irq(&acm->read_lock);
728 was_throttled = acm->throttled;
729 acm->throttled = 0;
730 acm->throttle_req = 0;
731 spin_unlock_irq(&acm->read_lock);
732
733 if (was_throttled)
734 acm_submit_read_urbs(acm, GFP_KERNEL);
735}
736
737static int acm_tty_break_ctl(struct tty_struct *tty, int state)
738{
739 struct acm *acm = tty->driver_data;
740 int retval;
741
742 retval = acm_send_break(acm, state ? 0xffff : 0);
743 if (retval < 0)
744 dev_dbg(&acm->control->dev, "%s - send break failed\n",
745 __func__);
746 return retval;
747}
748
749static int acm_tty_tiocmget(struct tty_struct *tty)
750{
751 struct acm *acm = tty->driver_data;
752
753 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
754 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
755 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
756 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
757 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
758 TIOCM_CTS;
759}
760
761static int acm_tty_tiocmset(struct tty_struct *tty,
762 unsigned int set, unsigned int clear)
763{
764 struct acm *acm = tty->driver_data;
765 unsigned int newctrl;
766
767 newctrl = acm->ctrlout;
768 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
769 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
770 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
771 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
772
773 newctrl = (newctrl & ~clear) | set;
774
775 if (acm->ctrlout == newctrl)
776 return 0;
777 return acm_set_control(acm, acm->ctrlout = newctrl);
778}
779
780static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
781{
782 struct serial_struct tmp;
783
784 if (!info)
785 return -EINVAL;
786
787 memset(&tmp, 0, sizeof(tmp));
788 tmp.flags = ASYNC_LOW_LATENCY;
789 tmp.xmit_fifo_size = acm->writesize;
790 tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
791
792 if (copy_to_user(info, &tmp, sizeof(tmp)))
793 return -EFAULT;
794 else
795 return 0;
796}
797
798static int acm_tty_ioctl(struct tty_struct *tty,
799 unsigned int cmd, unsigned long arg)
800{
801 struct acm *acm = tty->driver_data;
802 int rv = -ENOIOCTLCMD;
803
804 switch (cmd) {
805 case TIOCGSERIAL: /* gets serial port data */
806 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
807 break;
808 }
809
810 return rv;
811}
812
813static const __u32 acm_tty_speed[] = {
814 0, 50, 75, 110, 134, 150, 200, 300, 600,
815 1200, 1800, 2400, 4800, 9600, 19200, 38400,
816 57600, 115200, 230400, 460800, 500000, 576000,
817 921600, 1000000, 1152000, 1500000, 2000000,
818 2500000, 3000000, 3500000, 4000000
819};
820
821static const __u8 acm_tty_size[] = {
822 5, 6, 7, 8
823};
824
825static void acm_tty_set_termios(struct tty_struct *tty,
826 struct ktermios *termios_old)
827{
828 struct acm *acm = tty->driver_data;
829 struct ktermios *termios = tty->termios;
830 struct usb_cdc_line_coding newline;
831 int newctrl = acm->ctrlout;
832
833 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
834 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
835 newline.bParityType = termios->c_cflag & PARENB ?
836 (termios->c_cflag & PARODD ? 1 : 2) +
837 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
838 newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4];
839 /* FIXME: Needs to clear unsupported bits in the termios */
840 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
841
842 if (!newline.dwDTERate) {
843 newline.dwDTERate = acm->line.dwDTERate;
844 newctrl &= ~ACM_CTRL_DTR;
845 } else
846 newctrl |= ACM_CTRL_DTR;
847
848 if (newctrl != acm->ctrlout)
849 acm_set_control(acm, acm->ctrlout = newctrl);
850
851 if (memcmp(&acm->line, &newline, sizeof newline)) {
852 memcpy(&acm->line, &newline, sizeof newline);
853 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
854 __func__,
855 le32_to_cpu(newline.dwDTERate),
856 newline.bCharFormat, newline.bParityType,
857 newline.bDataBits);
858 acm_set_line(acm, &acm->line);
859 }
860}
861
862static const struct tty_port_operations acm_port_ops = {
863 .shutdown = acm_port_shutdown,
864 .activate = acm_port_activate,
865 .destruct = acm_port_destruct,
866};
867
868/*
869 * USB probe and disconnect routines.
870 */
871
872/* Little helpers: write/read buffers free */
873static void acm_write_buffers_free(struct acm *acm)
874{
875 int i;
876 struct acm_wb *wb;
877 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
878
879 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
880 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
881}
882
883static void acm_read_buffers_free(struct acm *acm)
884{
885 struct usb_device *usb_dev = interface_to_usbdev(acm->control);
886 int i;
887
888 for (i = 0; i < acm->rx_buflimit; i++)
889 usb_free_coherent(usb_dev, acm->readsize,
890 acm->read_buffers[i].base, acm->read_buffers[i].dma);
891}
892
893/* Little helper: write buffers allocate */
894static int acm_write_buffers_alloc(struct acm *acm)
895{
896 int i;
897 struct acm_wb *wb;
898
899 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
900 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
901 &wb->dmah);
902 if (!wb->buf) {
903 while (i != 0) {
904 --i;
905 --wb;
906 usb_free_coherent(acm->dev, acm->writesize,
907 wb->buf, wb->dmah);
908 }
909 return -ENOMEM;
910 }
911 }
912 return 0;
913}
914
915static int acm_probe(struct usb_interface *intf,
916 const struct usb_device_id *id)
917{
918 struct usb_cdc_union_desc *union_header = NULL;
919 struct usb_cdc_country_functional_desc *cfd = NULL;
920 unsigned char *buffer = intf->altsetting->extra;
921 int buflen = intf->altsetting->extralen;
922 struct usb_interface *control_interface;
923 struct usb_interface *data_interface;
924 struct usb_endpoint_descriptor *epctrl = NULL;
925 struct usb_endpoint_descriptor *epread = NULL;
926 struct usb_endpoint_descriptor *epwrite = NULL;
927 struct usb_device *usb_dev = interface_to_usbdev(intf);
928 struct acm *acm;
929 int minor;
930 int ctrlsize, readsize;
931 u8 *buf;
932 u8 ac_management_function = 0;
933 u8 call_management_function = 0;
934 int call_interface_num = -1;
935 int data_interface_num = -1;
936 unsigned long quirks;
937 int num_rx_buf;
938 int i;
939 int combined_interfaces = 0;
940
941 /* normal quirks */
942 quirks = (unsigned long)id->driver_info;
943 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
944
945 /* handle quirks deadly to normal probing*/
946 if (quirks == NO_UNION_NORMAL) {
947 data_interface = usb_ifnum_to_if(usb_dev, 1);
948 control_interface = usb_ifnum_to_if(usb_dev, 0);
949 goto skip_normal_probe;
950 }
951
952 /* normal probing*/
953 if (!buffer) {
954 dev_err(&intf->dev, "Weird descriptor references\n");
955 return -EINVAL;
956 }
957
958 if (!buflen) {
959 if (intf->cur_altsetting->endpoint &&
960 intf->cur_altsetting->endpoint->extralen &&
961 intf->cur_altsetting->endpoint->extra) {
962 dev_dbg(&intf->dev,
963 "Seeking extra descriptors on endpoint\n");
964 buflen = intf->cur_altsetting->endpoint->extralen;
965 buffer = intf->cur_altsetting->endpoint->extra;
966 } else {
967 dev_err(&intf->dev,
968 "Zero length descriptor references\n");
969 return -EINVAL;
970 }
971 }
972
973 while (buflen > 0) {
974 if (buffer[1] != USB_DT_CS_INTERFACE) {
975 dev_err(&intf->dev, "skipping garbage\n");
976 goto next_desc;
977 }
978
979 switch (buffer[2]) {
980 case USB_CDC_UNION_TYPE: /* we've found it */
981 if (union_header) {
982 dev_err(&intf->dev, "More than one "
983 "union descriptor, skipping ...\n");
984 goto next_desc;
985 }
986 union_header = (struct usb_cdc_union_desc *)buffer;
987 break;
988 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
989 cfd = (struct usb_cdc_country_functional_desc *)buffer;
990 break;
991 case USB_CDC_HEADER_TYPE: /* maybe check version */
992 break; /* for now we ignore it */
993 case USB_CDC_ACM_TYPE:
994 ac_management_function = buffer[3];
995 break;
996 case USB_CDC_CALL_MANAGEMENT_TYPE:
997 call_management_function = buffer[3];
998 call_interface_num = buffer[4];
999 if ( (quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1000 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1001 break;
1002 default:
1003 /* there are LOTS more CDC descriptors that
1004 * could legitimately be found here.
1005 */
1006 dev_dbg(&intf->dev, "Ignoring descriptor: "
1007 "type %02x, length %d\n",
1008 buffer[2], buffer[0]);
1009 break;
1010 }
1011next_desc:
1012 buflen -= buffer[0];
1013 buffer += buffer[0];
1014 }
1015
1016 if (!union_header) {
1017 if (call_interface_num > 0) {
1018 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1019 /* quirks for Droids MuIn LCD */
1020 if (quirks & NO_DATA_INTERFACE)
1021 data_interface = usb_ifnum_to_if(usb_dev, 0);
1022 else
1023 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1024 control_interface = intf;
1025 } else {
1026 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1027 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1028 return -ENODEV;
1029 } else {
1030 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1031 combined_interfaces = 1;
1032 control_interface = data_interface = intf;
1033 goto look_for_collapsed_interface;
1034 }
1035 }
1036 } else {
1037 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1038 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1039 if (!control_interface || !data_interface) {
1040 dev_dbg(&intf->dev, "no interfaces\n");
1041 return -ENODEV;
1042 }
1043 }
1044
1045 if (data_interface_num != call_interface_num)
1046 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1047
1048 if (control_interface == data_interface) {
1049 /* some broken devices designed for windows work this way */
1050 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1051 combined_interfaces = 1;
1052 /* a popular other OS doesn't use it */
1053 quirks |= NO_CAP_LINE;
1054 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1055 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1056 return -EINVAL;
1057 }
1058look_for_collapsed_interface:
1059 for (i = 0; i < 3; i++) {
1060 struct usb_endpoint_descriptor *ep;
1061 ep = &data_interface->cur_altsetting->endpoint[i].desc;
1062
1063 if (usb_endpoint_is_int_in(ep))
1064 epctrl = ep;
1065 else if (usb_endpoint_is_bulk_out(ep))
1066 epwrite = ep;
1067 else if (usb_endpoint_is_bulk_in(ep))
1068 epread = ep;
1069 else
1070 return -EINVAL;
1071 }
1072 if (!epctrl || !epread || !epwrite)
1073 return -ENODEV;
1074 else
1075 goto made_compressed_probe;
1076 }
1077
1078skip_normal_probe:
1079
1080 /*workaround for switched interfaces */
1081 if (data_interface->cur_altsetting->desc.bInterfaceClass
1082 != CDC_DATA_INTERFACE_TYPE) {
1083 if (control_interface->cur_altsetting->desc.bInterfaceClass
1084 == CDC_DATA_INTERFACE_TYPE) {
1085 struct usb_interface *t;
1086 dev_dbg(&intf->dev,
1087 "Your device has switched interfaces.\n");
1088 t = control_interface;
1089 control_interface = data_interface;
1090 data_interface = t;
1091 } else {
1092 return -EINVAL;
1093 }
1094 }
1095
1096 /* Accept probe requests only for the control interface */
1097 if (!combined_interfaces && intf != control_interface)
1098 return -ENODEV;
1099
1100 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1101 /* valid in this context */
1102 dev_dbg(&intf->dev, "The data interface isn't available\n");
1103 return -EBUSY;
1104 }
1105
1106
1107 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1108 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1109 return -EINVAL;
1110
1111 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1112 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1113 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1114
1115
1116 /* workaround for switched endpoints */
1117 if (!usb_endpoint_dir_in(epread)) {
1118 /* descriptors are swapped */
1119 struct usb_endpoint_descriptor *t;
1120 dev_dbg(&intf->dev,
1121 "The data interface has switched endpoints\n");
1122 t = epread;
1123 epread = epwrite;
1124 epwrite = t;
1125 }
1126made_compressed_probe:
1127 dev_dbg(&intf->dev, "interfaces are valid\n");
1128
1129 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1130 if (acm == NULL) {
1131 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1132 goto alloc_fail;
1133 }
1134
1135 minor = acm_alloc_minor(acm);
1136 if (minor == ACM_TTY_MINORS) {
1137 dev_err(&intf->dev, "no more free acm devices\n");
1138 kfree(acm);
1139 return -ENODEV;
1140 }
1141
1142 ctrlsize = usb_endpoint_maxp(epctrl);
1143 readsize = usb_endpoint_maxp(epread) *
1144 (quirks == SINGLE_RX_URB ? 1 : 2);
1145 acm->combined_interfaces = combined_interfaces;
1146 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1147 acm->control = control_interface;
1148 acm->data = data_interface;
1149 acm->minor = minor;
1150 acm->dev = usb_dev;
1151 acm->ctrl_caps = ac_management_function;
1152 if (quirks & NO_CAP_LINE)
1153 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1154 acm->ctrlsize = ctrlsize;
1155 acm->readsize = readsize;
1156 acm->rx_buflimit = num_rx_buf;
1157 INIT_WORK(&acm->work, acm_softint);
1158 spin_lock_init(&acm->write_lock);
1159 spin_lock_init(&acm->read_lock);
1160 mutex_init(&acm->mutex);
1161 acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1162 acm->is_int_ep = usb_endpoint_xfer_int(epread);
1163 if (acm->is_int_ep)
1164 acm->bInterval = epread->bInterval;
1165 tty_port_init(&acm->port);
1166 acm->port.ops = &acm_port_ops;
1167
1168 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1169 if (!buf) {
1170 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1171 goto alloc_fail2;
1172 }
1173 acm->ctrl_buffer = buf;
1174
1175 if (acm_write_buffers_alloc(acm) < 0) {
1176 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1177 goto alloc_fail4;
1178 }
1179
1180 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1181 if (!acm->ctrlurb) {
1182 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1183 goto alloc_fail5;
1184 }
1185 for (i = 0; i < num_rx_buf; i++) {
1186 struct acm_rb *rb = &(acm->read_buffers[i]);
1187 struct urb *urb;
1188
1189 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1190 &rb->dma);
1191 if (!rb->base) {
1192 dev_err(&intf->dev, "out of memory "
1193 "(read bufs usb_alloc_coherent)\n");
1194 goto alloc_fail6;
1195 }
1196 rb->index = i;
1197 rb->instance = acm;
1198
1199 urb = usb_alloc_urb(0, GFP_KERNEL);
1200 if (!urb) {
1201 dev_err(&intf->dev,
1202 "out of memory (read urbs usb_alloc_urb)\n");
1203 goto alloc_fail6;
1204 }
1205 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1206 urb->transfer_dma = rb->dma;
1207 if (acm->is_int_ep) {
1208 usb_fill_int_urb(urb, acm->dev,
1209 acm->rx_endpoint,
1210 rb->base,
1211 acm->readsize,
1212 acm_read_bulk_callback, rb,
1213 acm->bInterval);
1214 } else {
1215 usb_fill_bulk_urb(urb, acm->dev,
1216 acm->rx_endpoint,
1217 rb->base,
1218 acm->readsize,
1219 acm_read_bulk_callback, rb);
1220 }
1221
1222 acm->read_urbs[i] = urb;
1223 __set_bit(i, &acm->read_urbs_free);
1224 }
1225 for (i = 0; i < ACM_NW; i++) {
1226 struct acm_wb *snd = &(acm->wb[i]);
1227
1228 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1229 if (snd->urb == NULL) {
1230 dev_err(&intf->dev,
1231 "out of memory (write urbs usb_alloc_urb)\n");
1232 goto alloc_fail7;
1233 }
1234
1235 if (usb_endpoint_xfer_int(epwrite))
1236 usb_fill_int_urb(snd->urb, usb_dev,
1237 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1238 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1239 else
1240 usb_fill_bulk_urb(snd->urb, usb_dev,
1241 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1242 NULL, acm->writesize, acm_write_bulk, snd);
1243 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1244 snd->instance = acm;
1245 }
1246
1247 usb_set_intfdata(intf, acm);
1248
1249 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1250 if (i < 0)
1251 goto alloc_fail7;
1252
1253 if (cfd) { /* export the country data */
1254 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1255 if (!acm->country_codes)
1256 goto skip_countries;
1257 acm->country_code_size = cfd->bLength - 4;
1258 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1259 cfd->bLength - 4);
1260 acm->country_rel_date = cfd->iCountryCodeRelDate;
1261
1262 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1263 if (i < 0) {
1264 kfree(acm->country_codes);
1265 acm->country_codes = NULL;
1266 acm->country_code_size = 0;
1267 goto skip_countries;
1268 }
1269
1270 i = device_create_file(&intf->dev,
1271 &dev_attr_iCountryCodeRelDate);
1272 if (i < 0) {
1273 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1274 kfree(acm->country_codes);
1275 acm->country_codes = NULL;
1276 acm->country_code_size = 0;
1277 goto skip_countries;
1278 }
1279 }
1280
1281skip_countries:
1282 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1283 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1284 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1285 /* works around buggy devices */
1286 epctrl->bInterval ? epctrl->bInterval : 0xff);
1287 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1288 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1289
1290 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1291
1292 acm_set_control(acm, acm->ctrlout);
1293
1294 acm->line.dwDTERate = cpu_to_le32(9600);
1295 acm->line.bDataBits = 8;
1296 acm_set_line(acm, &acm->line);
1297
1298 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1299 usb_set_intfdata(data_interface, acm);
1300
1301 usb_get_intf(control_interface);
1302 tty_register_device(acm_tty_driver, minor, &control_interface->dev);
1303
1304 return 0;
1305alloc_fail7:
1306 for (i = 0; i < ACM_NW; i++)
1307 usb_free_urb(acm->wb[i].urb);
1308alloc_fail6:
1309 for (i = 0; i < num_rx_buf; i++)
1310 usb_free_urb(acm->read_urbs[i]);
1311 acm_read_buffers_free(acm);
1312 usb_free_urb(acm->ctrlurb);
1313alloc_fail5:
1314 acm_write_buffers_free(acm);
1315alloc_fail4:
1316 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1317alloc_fail2:
1318 acm_release_minor(acm);
1319 kfree(acm);
1320alloc_fail:
1321 return -ENOMEM;
1322}
1323
1324static void stop_data_traffic(struct acm *acm)
1325{
1326 int i;
1327
1328 dev_dbg(&acm->control->dev, "%s\n", __func__);
1329
1330 usb_kill_urb(acm->ctrlurb);
1331 for (i = 0; i < ACM_NW; i++)
1332 usb_kill_urb(acm->wb[i].urb);
1333 for (i = 0; i < acm->rx_buflimit; i++)
1334 usb_kill_urb(acm->read_urbs[i]);
1335
1336 cancel_work_sync(&acm->work);
1337}
1338
1339static void acm_disconnect(struct usb_interface *intf)
1340{
1341 struct acm *acm = usb_get_intfdata(intf);
1342 struct usb_device *usb_dev = interface_to_usbdev(intf);
1343 struct tty_struct *tty;
1344 int i;
1345
1346 dev_dbg(&intf->dev, "%s\n", __func__);
1347
1348 /* sibling interface is already cleaning up */
1349 if (!acm)
1350 return;
1351
1352 mutex_lock(&acm->mutex);
1353 acm->disconnected = true;
1354 if (acm->country_codes) {
1355 device_remove_file(&acm->control->dev,
1356 &dev_attr_wCountryCodes);
1357 device_remove_file(&acm->control->dev,
1358 &dev_attr_iCountryCodeRelDate);
1359 }
1360 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1361 usb_set_intfdata(acm->control, NULL);
1362 usb_set_intfdata(acm->data, NULL);
1363 mutex_unlock(&acm->mutex);
1364
1365 tty = tty_port_tty_get(&acm->port);
1366 if (tty) {
1367 tty_vhangup(tty);
1368 tty_kref_put(tty);
1369 }
1370
1371 stop_data_traffic(acm);
1372
1373 usb_free_urb(acm->ctrlurb);
1374 for (i = 0; i < ACM_NW; i++)
1375 usb_free_urb(acm->wb[i].urb);
1376 for (i = 0; i < acm->rx_buflimit; i++)
1377 usb_free_urb(acm->read_urbs[i]);
1378 acm_write_buffers_free(acm);
1379 usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1380 acm_read_buffers_free(acm);
1381
1382 if (!acm->combined_interfaces)
1383 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1384 acm->data : acm->control);
1385
1386 tty_port_put(&acm->port);
1387}
1388
1389#ifdef CONFIG_PM
1390static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1391{
1392 struct acm *acm = usb_get_intfdata(intf);
1393 int cnt;
1394
1395 if (PMSG_IS_AUTO(message)) {
1396 int b;
1397
1398 spin_lock_irq(&acm->write_lock);
1399 b = acm->transmitting;
1400 spin_unlock_irq(&acm->write_lock);
1401 if (b)
1402 return -EBUSY;
1403 }
1404
1405 spin_lock_irq(&acm->read_lock);
1406 spin_lock(&acm->write_lock);
1407 cnt = acm->susp_count++;
1408 spin_unlock(&acm->write_lock);
1409 spin_unlock_irq(&acm->read_lock);
1410
1411 if (cnt)
1412 return 0;
1413
1414 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1415 stop_data_traffic(acm);
1416
1417 return 0;
1418}
1419
1420static int acm_resume(struct usb_interface *intf)
1421{
1422 struct acm *acm = usb_get_intfdata(intf);
1423 struct acm_wb *wb;
1424 int rv = 0;
1425 int cnt;
1426
1427 spin_lock_irq(&acm->read_lock);
1428 acm->susp_count -= 1;
1429 cnt = acm->susp_count;
1430 spin_unlock_irq(&acm->read_lock);
1431
1432 if (cnt)
1433 return 0;
1434
1435 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1436 rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1437
1438 spin_lock_irq(&acm->write_lock);
1439 if (acm->delayed_wb) {
1440 wb = acm->delayed_wb;
1441 acm->delayed_wb = NULL;
1442 spin_unlock_irq(&acm->write_lock);
1443 acm_start_wb(acm, wb);
1444 } else {
1445 spin_unlock_irq(&acm->write_lock);
1446 }
1447
1448 /*
1449 * delayed error checking because we must
1450 * do the write path at all cost
1451 */
1452 if (rv < 0)
1453 goto err_out;
1454
1455 rv = acm_submit_read_urbs(acm, GFP_NOIO);
1456 }
1457
1458err_out:
1459 return rv;
1460}
1461
1462static int acm_reset_resume(struct usb_interface *intf)
1463{
1464 struct acm *acm = usb_get_intfdata(intf);
1465 struct tty_struct *tty;
1466
1467 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1468 tty = tty_port_tty_get(&acm->port);
1469 if (tty) {
1470 tty_hangup(tty);
1471 tty_kref_put(tty);
1472 }
1473 }
1474
1475 return acm_resume(intf);
1476}
1477
1478#endif /* CONFIG_PM */
1479
1480#define NOKIA_PCSUITE_ACM_INFO(x) \
1481 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1482 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1483 USB_CDC_ACM_PROTO_VENDOR)
1484
1485#define SAMSUNG_PCSUITE_ACM_INFO(x) \
1486 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1487 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1488 USB_CDC_ACM_PROTO_VENDOR)
1489
1490/*
1491 * USB driver structure.
1492 */
1493
1494static const struct usb_device_id acm_ids[] = {
1495 /* quirky and broken devices */
1496 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1497 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1498 },
1499 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1500 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1501 },
1502 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1503 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1504 },
1505 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1506 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1507 },
1508 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1509 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1510 },
1511 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1512 .driver_info = SINGLE_RX_URB,
1513 },
1514 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1515 .driver_info = SINGLE_RX_URB, /* firmware bug */
1516 },
1517 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1518 .driver_info = SINGLE_RX_URB, /* firmware bug */
1519 },
1520 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1521 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1522 },
1523 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1524 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1525 },
1526 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1527 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1528 },
1529 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1530 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1531 },
1532 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1533 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1534 },
1535 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1536 },
1537 /* Motorola H24 HSPA module: */
1538 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1539 { USB_DEVICE(0x22b8, 0x2d92) }, /* modem + diagnostics */
1540 { USB_DEVICE(0x22b8, 0x2d93) }, /* modem + AT port */
1541 { USB_DEVICE(0x22b8, 0x2d95) }, /* modem + AT port + diagnostics */
1542 { USB_DEVICE(0x22b8, 0x2d96) }, /* modem + NMEA */
1543 { USB_DEVICE(0x22b8, 0x2d97) }, /* modem + diagnostics + NMEA */
1544 { USB_DEVICE(0x22b8, 0x2d99) }, /* modem + AT port + NMEA */
1545 { USB_DEVICE(0x22b8, 0x2d9a) }, /* modem + AT port + diagnostics + NMEA */
1546
1547 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1548 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1549 data interface instead of
1550 communications interface.
1551 Maybe we should define a new
1552 quirk for this. */
1553 },
1554 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1555 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1556 },
1557 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1558 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1559 },
1560
1561 /* Nokia S60 phones expose two ACM channels. The first is
1562 * a modem and is picked up by the standard AT-command
1563 * information below. The second is 'vendor-specific' but
1564 * is treated as a serial device at the S60 end, so we want
1565 * to expose it on Linux too. */
1566 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1567 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1568 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1569 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1570 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1571 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1572 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1573 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1574 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1575 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1576 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1577 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1578 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1579 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1580 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1581 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1582 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1583 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1584 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1585 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1586 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1587 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1588 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1589 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1590 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1591 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1592 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1593 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1594 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1595 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1596 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1597 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1598 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1599 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1600 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1601 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1602 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1603 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1604 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1605 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1606 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1607 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1608 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1609 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1610 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1611 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1612 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1613 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1614 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1615 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1616 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1617 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1618 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1619 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1620 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1621 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1622 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1623 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1624
1625 /* Support for Owen devices */
1626 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1627
1628 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1629
1630 /* Support Lego NXT using pbLua firmware */
1631 { USB_DEVICE(0x0694, 0xff00),
1632 .driver_info = NOT_A_MODEM,
1633 },
1634
1635 /* Support for Droids MuIn LCD */
1636 { USB_DEVICE(0x04d8, 0x000b),
1637 .driver_info = NO_DATA_INTERFACE,
1638 },
1639
1640 /* control interfaces without any protocol set */
1641 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1642 USB_CDC_PROTO_NONE) },
1643
1644 /* control interfaces with various AT-command sets */
1645 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1646 USB_CDC_ACM_PROTO_AT_V25TER) },
1647 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1648 USB_CDC_ACM_PROTO_AT_PCCA101) },
1649 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1650 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1651 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1652 USB_CDC_ACM_PROTO_AT_GSM) },
1653 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1654 USB_CDC_ACM_PROTO_AT_3G) },
1655 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1656 USB_CDC_ACM_PROTO_AT_CDMA) },
1657
1658 { }
1659};
1660
1661MODULE_DEVICE_TABLE(usb, acm_ids);
1662
1663static struct usb_driver acm_driver = {
1664 .name = "cdc_acm",
1665 .probe = acm_probe,
1666 .disconnect = acm_disconnect,
1667#ifdef CONFIG_PM
1668 .suspend = acm_suspend,
1669 .resume = acm_resume,
1670 .reset_resume = acm_reset_resume,
1671#endif
1672 .id_table = acm_ids,
1673#ifdef CONFIG_PM
1674 .supports_autosuspend = 1,
1675#endif
1676 .disable_hub_initiated_lpm = 1,
1677};
1678
1679/*
1680 * TTY driver structures.
1681 */
1682
1683static const struct tty_operations acm_ops = {
1684 .install = acm_tty_install,
1685 .open = acm_tty_open,
1686 .close = acm_tty_close,
1687 .cleanup = acm_tty_cleanup,
1688 .hangup = acm_tty_hangup,
1689 .write = acm_tty_write,
1690 .write_room = acm_tty_write_room,
1691 .ioctl = acm_tty_ioctl,
1692 .throttle = acm_tty_throttle,
1693 .unthrottle = acm_tty_unthrottle,
1694 .chars_in_buffer = acm_tty_chars_in_buffer,
1695 .break_ctl = acm_tty_break_ctl,
1696 .set_termios = acm_tty_set_termios,
1697 .tiocmget = acm_tty_tiocmget,
1698 .tiocmset = acm_tty_tiocmset,
1699};
1700
1701/*
1702 * Init / exit.
1703 */
1704
1705static int __init acm_init(void)
1706{
1707 int retval;
1708 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1709 if (!acm_tty_driver)
1710 return -ENOMEM;
1711 acm_tty_driver->driver_name = "acm",
1712 acm_tty_driver->name = "ttyACM",
1713 acm_tty_driver->major = ACM_TTY_MAJOR,
1714 acm_tty_driver->minor_start = 0,
1715 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1716 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1717 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1718 acm_tty_driver->init_termios = tty_std_termios;
1719 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1720 HUPCL | CLOCAL;
1721 tty_set_operations(acm_tty_driver, &acm_ops);
1722
1723 retval = tty_register_driver(acm_tty_driver);
1724 if (retval) {
1725 put_tty_driver(acm_tty_driver);
1726 return retval;
1727 }
1728
1729 retval = usb_register(&acm_driver);
1730 if (retval) {
1731 tty_unregister_driver(acm_tty_driver);
1732 put_tty_driver(acm_tty_driver);
1733 return retval;
1734 }
1735
1736 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1737
1738 return 0;
1739}
1740
1741static void __exit acm_exit(void)
1742{
1743 usb_deregister(&acm_driver);
1744 tty_unregister_driver(acm_tty_driver);
1745 put_tty_driver(acm_tty_driver);
1746}
1747
1748module_init(acm_init);
1749module_exit(acm_exit);
1750
1751MODULE_AUTHOR(DRIVER_AUTHOR);
1752MODULE_DESCRIPTION(DRIVER_DESC);
1753MODULE_LICENSE("GPL");
1754MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * cdc-acm.c
4 *
5 * Copyright (c) 1999 Armin Fuerst <fuerst@in.tum.de>
6 * Copyright (c) 1999 Pavel Machek <pavel@ucw.cz>
7 * Copyright (c) 1999 Johannes Erdfelt <johannes@erdfelt.com>
8 * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz>
9 * Copyright (c) 2004 Oliver Neukum <oliver@neukum.name>
10 * Copyright (c) 2005 David Kubicek <dave@awk.cz>
11 * Copyright (c) 2011 Johan Hovold <jhovold@gmail.com>
12 *
13 * USB Abstract Control Model driver for USB modems and ISDN adapters
14 *
15 * Sponsored by SuSE
16 */
17
18#undef DEBUG
19#undef VERBOSE_DEBUG
20
21#include <linux/kernel.h>
22#include <linux/sched/signal.h>
23#include <linux/errno.h>
24#include <linux/init.h>
25#include <linux/slab.h>
26#include <linux/log2.h>
27#include <linux/tty.h>
28#include <linux/serial.h>
29#include <linux/tty_driver.h>
30#include <linux/tty_flip.h>
31#include <linux/module.h>
32#include <linux/mutex.h>
33#include <linux/uaccess.h>
34#include <linux/usb.h>
35#include <linux/usb/cdc.h>
36#include <asm/byteorder.h>
37#include <asm/unaligned.h>
38#include <linux/idr.h>
39#include <linux/list.h>
40
41#include "cdc-acm.h"
42
43
44#define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
45#define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
46
47static struct usb_driver acm_driver;
48static struct tty_driver *acm_tty_driver;
49
50static DEFINE_IDR(acm_minors);
51static DEFINE_MUTEX(acm_minors_lock);
52
53static void acm_tty_set_termios(struct tty_struct *tty,
54 struct ktermios *termios_old);
55
56/*
57 * acm_minors accessors
58 */
59
60/*
61 * Look up an ACM structure by minor. If found and not disconnected, increment
62 * its refcount and return it with its mutex held.
63 */
64static struct acm *acm_get_by_minor(unsigned int minor)
65{
66 struct acm *acm;
67
68 mutex_lock(&acm_minors_lock);
69 acm = idr_find(&acm_minors, minor);
70 if (acm) {
71 mutex_lock(&acm->mutex);
72 if (acm->disconnected) {
73 mutex_unlock(&acm->mutex);
74 acm = NULL;
75 } else {
76 tty_port_get(&acm->port);
77 mutex_unlock(&acm->mutex);
78 }
79 }
80 mutex_unlock(&acm_minors_lock);
81 return acm;
82}
83
84/*
85 * Try to find an available minor number and if found, associate it with 'acm'.
86 */
87static int acm_alloc_minor(struct acm *acm)
88{
89 int minor;
90
91 mutex_lock(&acm_minors_lock);
92 minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
93 mutex_unlock(&acm_minors_lock);
94
95 return minor;
96}
97
98/* Release the minor number associated with 'acm'. */
99static void acm_release_minor(struct acm *acm)
100{
101 mutex_lock(&acm_minors_lock);
102 idr_remove(&acm_minors, acm->minor);
103 mutex_unlock(&acm_minors_lock);
104}
105
106/*
107 * Functions for ACM control messages.
108 */
109
110static int acm_ctrl_msg(struct acm *acm, int request, int value,
111 void *buf, int len)
112{
113 int retval;
114
115 retval = usb_autopm_get_interface(acm->control);
116 if (retval)
117 return retval;
118
119 retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
120 request, USB_RT_ACM, value,
121 acm->control->altsetting[0].desc.bInterfaceNumber,
122 buf, len, 5000);
123
124 dev_dbg(&acm->control->dev,
125 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
126 __func__, request, value, len, retval);
127
128 usb_autopm_put_interface(acm->control);
129
130 return retval < 0 ? retval : 0;
131}
132
133/* devices aren't required to support these requests.
134 * the cdc acm descriptor tells whether they do...
135 */
136static inline int acm_set_control(struct acm *acm, int control)
137{
138 if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
139 return -EOPNOTSUPP;
140
141 return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
142 control, NULL, 0);
143}
144
145#define acm_set_line(acm, line) \
146 acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
147#define acm_send_break(acm, ms) \
148 acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
149
150static void acm_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
166static 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
186static 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 */
202static 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
215static 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 */
239static 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}
247static DEVICE_ATTR_RO(bmCapabilities);
248
249static 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
259static DEVICE_ATTR_RO(wCountryCodes);
260
261static 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
270static DEVICE_ATTR_RO(iCountryCodeRelDate);
271/*
272 * Interrupt handlers for various ACM device responses
273 */
274
275static void acm_process_notification(struct acm *acm, unsigned char *buf)
276{
277 int newctrl;
278 int difference;
279 struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
280 unsigned char *data = buf + sizeof(struct usb_cdc_notification);
281
282 switch (dr->bNotificationType) {
283 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
284 dev_dbg(&acm->control->dev,
285 "%s - network connection: %d\n", __func__, dr->wValue);
286 break;
287
288 case USB_CDC_NOTIFY_SERIAL_STATE:
289 if (le16_to_cpu(dr->wLength) != 2) {
290 dev_dbg(&acm->control->dev,
291 "%s - malformed serial state\n", __func__);
292 break;
293 }
294
295 newctrl = get_unaligned_le16(data);
296 dev_dbg(&acm->control->dev,
297 "%s - serial state: 0x%x\n", __func__, newctrl);
298
299 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
300 dev_dbg(&acm->control->dev,
301 "%s - calling hangup\n", __func__);
302 tty_port_tty_hangup(&acm->port, false);
303 }
304
305 difference = acm->ctrlin ^ newctrl;
306 spin_lock(&acm->read_lock);
307 acm->ctrlin = newctrl;
308 acm->oldcount = acm->iocount;
309
310 if (difference & ACM_CTRL_DSR)
311 acm->iocount.dsr++;
312 if (difference & ACM_CTRL_BRK)
313 acm->iocount.brk++;
314 if (difference & ACM_CTRL_RI)
315 acm->iocount.rng++;
316 if (difference & ACM_CTRL_DCD)
317 acm->iocount.dcd++;
318 if (difference & ACM_CTRL_FRAMING)
319 acm->iocount.frame++;
320 if (difference & ACM_CTRL_PARITY)
321 acm->iocount.parity++;
322 if (difference & ACM_CTRL_OVERRUN)
323 acm->iocount.overrun++;
324 spin_unlock(&acm->read_lock);
325
326 if (difference)
327 wake_up_all(&acm->wioctl);
328
329 break;
330
331 default:
332 dev_dbg(&acm->control->dev,
333 "%s - unknown notification %d received: index %d len %d\n",
334 __func__,
335 dr->bNotificationType, dr->wIndex, dr->wLength);
336 }
337}
338
339/* control interface reports status changes with "interrupt" transfers */
340static void acm_ctrl_irq(struct urb *urb)
341{
342 struct acm *acm = urb->context;
343 struct usb_cdc_notification *dr = urb->transfer_buffer;
344 unsigned int current_size = urb->actual_length;
345 unsigned int expected_size, copy_size, alloc_size;
346 int retval;
347 int status = urb->status;
348
349 switch (status) {
350 case 0:
351 /* success */
352 break;
353 case -ECONNRESET:
354 case -ENOENT:
355 case -ESHUTDOWN:
356 /* this urb is terminated, clean up */
357 acm->nb_index = 0;
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
413exit:
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
420static 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
443static 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
457static 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
467static void acm_read_bulk_callback(struct urb *urb)
468{
469 struct acm_rb *rb = urb->context;
470 struct acm *acm = rb->instance;
471 unsigned long flags;
472 int status = urb->status;
473
474 dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
475 rb->index, urb->actual_length, status);
476
477 set_bit(rb->index, &acm->read_urbs_free);
478
479 if (!acm->dev) {
480 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
481 return;
482 }
483
484 switch (status) {
485 case 0:
486 usb_mark_last_busy(acm->dev);
487 acm_process_read_urb(acm, urb);
488 break;
489 case -EPIPE:
490 set_bit(EVENT_RX_STALL, &acm->flags);
491 schedule_work(&acm->work);
492 return;
493 case -ENOENT:
494 case -ECONNRESET:
495 case -ESHUTDOWN:
496 dev_dbg(&acm->data->dev,
497 "%s - urb shutting down with status: %d\n",
498 __func__, status);
499 return;
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 * Unthrottle may run on another CPU which needs to see events
509 * in the same order. Submission has an implict barrier
510 */
511 smp_mb__before_atomic();
512
513 /* throttle device if requested by tty */
514 spin_lock_irqsave(&acm->read_lock, flags);
515 acm->throttled = acm->throttle_req;
516 if (!acm->throttled) {
517 spin_unlock_irqrestore(&acm->read_lock, flags);
518 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
519 } else {
520 spin_unlock_irqrestore(&acm->read_lock, flags);
521 }
522}
523
524/* data interface wrote those outgoing bytes */
525static void acm_write_bulk(struct urb *urb)
526{
527 struct acm_wb *wb = urb->context;
528 struct acm *acm = wb->instance;
529 unsigned long flags;
530 int status = urb->status;
531
532 if (status || (urb->actual_length != urb->transfer_buffer_length))
533 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
534 urb->actual_length,
535 urb->transfer_buffer_length,
536 status);
537
538 spin_lock_irqsave(&acm->write_lock, flags);
539 acm_write_done(acm, wb);
540 spin_unlock_irqrestore(&acm->write_lock, flags);
541 set_bit(EVENT_TTY_WAKEUP, &acm->flags);
542 schedule_work(&acm->work);
543}
544
545static void acm_softint(struct work_struct *work)
546{
547 int i;
548 struct acm *acm = container_of(work, struct acm, work);
549
550 if (test_bit(EVENT_RX_STALL, &acm->flags)) {
551 if (!(usb_autopm_get_interface(acm->data))) {
552 for (i = 0; i < acm->rx_buflimit; i++)
553 usb_kill_urb(acm->read_urbs[i]);
554 usb_clear_halt(acm->dev, acm->in);
555 acm_submit_read_urbs(acm, GFP_KERNEL);
556 usb_autopm_put_interface(acm->data);
557 }
558 clear_bit(EVENT_RX_STALL, &acm->flags);
559 }
560
561 if (test_bit(EVENT_TTY_WAKEUP, &acm->flags)) {
562 tty_port_tty_wakeup(&acm->port);
563 clear_bit(EVENT_TTY_WAKEUP, &acm->flags);
564 }
565}
566
567/*
568 * TTY handlers
569 */
570
571static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
572{
573 struct acm *acm;
574 int retval;
575
576 acm = acm_get_by_minor(tty->index);
577 if (!acm)
578 return -ENODEV;
579
580 retval = tty_standard_install(driver, tty);
581 if (retval)
582 goto error_init_termios;
583
584 tty->driver_data = acm;
585
586 return 0;
587
588error_init_termios:
589 tty_port_put(&acm->port);
590 return retval;
591}
592
593static int acm_tty_open(struct tty_struct *tty, struct file *filp)
594{
595 struct acm *acm = tty->driver_data;
596
597 return tty_port_open(&acm->port, tty, filp);
598}
599
600static void acm_port_dtr_rts(struct tty_port *port, int raise)
601{
602 struct acm *acm = container_of(port, struct acm, port);
603 int val;
604 int res;
605
606 if (raise)
607 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
608 else
609 val = 0;
610
611 /* FIXME: add missing ctrlout locking throughout driver */
612 acm->ctrlout = val;
613
614 res = acm_set_control(acm, val);
615 if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
616 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
617}
618
619static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
620{
621 struct acm *acm = container_of(port, struct acm, port);
622 int retval = -ENODEV;
623 int i;
624
625 mutex_lock(&acm->mutex);
626 if (acm->disconnected)
627 goto disconnected;
628
629 retval = usb_autopm_get_interface(acm->control);
630 if (retval)
631 goto error_get_interface;
632
633 /*
634 * FIXME: Why do we need this? Allocating 64K of physically contiguous
635 * memory is really nasty...
636 */
637 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
638 acm->control->needs_remote_wakeup = 1;
639
640 acm->ctrlurb->dev = acm->dev;
641 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
642 if (retval) {
643 dev_err(&acm->control->dev,
644 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
645 goto error_submit_urb;
646 }
647
648 acm_tty_set_termios(tty, NULL);
649
650 /*
651 * Unthrottle device in case the TTY was closed while throttled.
652 */
653 spin_lock_irq(&acm->read_lock);
654 acm->throttled = 0;
655 acm->throttle_req = 0;
656 spin_unlock_irq(&acm->read_lock);
657
658 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
659 if (retval)
660 goto error_submit_read_urbs;
661
662 usb_autopm_put_interface(acm->control);
663
664 mutex_unlock(&acm->mutex);
665
666 return 0;
667
668error_submit_read_urbs:
669 for (i = 0; i < acm->rx_buflimit; i++)
670 usb_kill_urb(acm->read_urbs[i]);
671 usb_kill_urb(acm->ctrlurb);
672error_submit_urb:
673 usb_autopm_put_interface(acm->control);
674error_get_interface:
675disconnected:
676 mutex_unlock(&acm->mutex);
677
678 return usb_translate_errors(retval);
679}
680
681static void acm_port_destruct(struct tty_port *port)
682{
683 struct acm *acm = container_of(port, struct acm, port);
684
685 acm_release_minor(acm);
686 usb_put_intf(acm->control);
687 kfree(acm->country_codes);
688 kfree(acm);
689}
690
691static void acm_port_shutdown(struct tty_port *port)
692{
693 struct acm *acm = container_of(port, struct acm, port);
694 struct urb *urb;
695 struct acm_wb *wb;
696
697 /*
698 * Need to grab write_lock to prevent race with resume, but no need to
699 * hold it due to the tty-port initialised flag.
700 */
701 spin_lock_irq(&acm->write_lock);
702 spin_unlock_irq(&acm->write_lock);
703
704 usb_autopm_get_interface_no_resume(acm->control);
705 acm->control->needs_remote_wakeup = 0;
706 usb_autopm_put_interface(acm->control);
707
708 for (;;) {
709 urb = usb_get_from_anchor(&acm->delayed);
710 if (!urb)
711 break;
712 wb = urb->context;
713 wb->use = 0;
714 usb_autopm_put_interface_async(acm->control);
715 }
716
717 acm_kill_urbs(acm);
718}
719
720static void acm_tty_cleanup(struct tty_struct *tty)
721{
722 struct acm *acm = tty->driver_data;
723
724 tty_port_put(&acm->port);
725}
726
727static void acm_tty_hangup(struct tty_struct *tty)
728{
729 struct acm *acm = tty->driver_data;
730
731 tty_port_hangup(&acm->port);
732}
733
734static void acm_tty_close(struct tty_struct *tty, struct file *filp)
735{
736 struct acm *acm = tty->driver_data;
737
738 tty_port_close(&acm->port, tty, filp);
739}
740
741static int acm_tty_write(struct tty_struct *tty,
742 const unsigned char *buf, int count)
743{
744 struct acm *acm = tty->driver_data;
745 int stat;
746 unsigned long flags;
747 int wbn;
748 struct acm_wb *wb;
749
750 if (!count)
751 return 0;
752
753 dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
754
755 spin_lock_irqsave(&acm->write_lock, flags);
756 wbn = acm_wb_alloc(acm);
757 if (wbn < 0) {
758 spin_unlock_irqrestore(&acm->write_lock, flags);
759 return 0;
760 }
761 wb = &acm->wb[wbn];
762
763 if (!acm->dev) {
764 wb->use = 0;
765 spin_unlock_irqrestore(&acm->write_lock, flags);
766 return -ENODEV;
767 }
768
769 count = (count > acm->writesize) ? acm->writesize : count;
770 dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
771 memcpy(wb->buf, buf, count);
772 wb->len = count;
773
774 stat = usb_autopm_get_interface_async(acm->control);
775 if (stat) {
776 wb->use = 0;
777 spin_unlock_irqrestore(&acm->write_lock, flags);
778 return stat;
779 }
780
781 if (acm->susp_count) {
782 if (acm->putbuffer) {
783 /* now to preserve order */
784 usb_anchor_urb(acm->putbuffer->urb, &acm->delayed);
785 acm->putbuffer = NULL;
786 }
787 usb_anchor_urb(wb->urb, &acm->delayed);
788 spin_unlock_irqrestore(&acm->write_lock, flags);
789 return count;
790 } else {
791 if (acm->putbuffer) {
792 /* at this point there is no good way to handle errors */
793 acm_start_wb(acm, acm->putbuffer);
794 acm->putbuffer = NULL;
795 }
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
806static void acm_tty_flush_chars(struct tty_struct *tty)
807{
808 struct acm *acm = tty->driver_data;
809 struct acm_wb *cur;
810 int err;
811 unsigned long flags;
812
813 spin_lock_irqsave(&acm->write_lock, flags);
814
815 cur = acm->putbuffer;
816 if (!cur) /* nothing to do */
817 goto out;
818
819 acm->putbuffer = NULL;
820 err = usb_autopm_get_interface_async(acm->control);
821 if (err < 0) {
822 cur->use = 0;
823 acm->putbuffer = cur;
824 goto out;
825 }
826
827 if (acm->susp_count)
828 usb_anchor_urb(cur->urb, &acm->delayed);
829 else
830 acm_start_wb(acm, cur);
831out:
832 spin_unlock_irqrestore(&acm->write_lock, flags);
833 return;
834}
835
836static int acm_tty_put_char(struct tty_struct *tty, unsigned char ch)
837{
838 struct acm *acm = tty->driver_data;
839 struct acm_wb *cur;
840 int wbn;
841 unsigned long flags;
842
843overflow:
844 cur = acm->putbuffer;
845 if (!cur) {
846 spin_lock_irqsave(&acm->write_lock, flags);
847 wbn = acm_wb_alloc(acm);
848 if (wbn >= 0) {
849 cur = &acm->wb[wbn];
850 acm->putbuffer = cur;
851 }
852 spin_unlock_irqrestore(&acm->write_lock, flags);
853 if (!cur)
854 return 0;
855 }
856
857 if (cur->len == acm->writesize) {
858 acm_tty_flush_chars(tty);
859 goto overflow;
860 }
861
862 cur->buf[cur->len++] = ch;
863 return 1;
864}
865
866static int acm_tty_write_room(struct tty_struct *tty)
867{
868 struct acm *acm = tty->driver_data;
869 /*
870 * Do not let the line discipline to know that we have a reserve,
871 * or it might get too enthusiastic.
872 */
873 return acm_wb_is_avail(acm) ? acm->writesize : 0;
874}
875
876static int acm_tty_chars_in_buffer(struct tty_struct *tty)
877{
878 struct acm *acm = tty->driver_data;
879 /*
880 * if the device was unplugged then any remaining characters fell out
881 * of the connector ;)
882 */
883 if (acm->disconnected)
884 return 0;
885 /*
886 * This is inaccurate (overcounts), but it works.
887 */
888 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
889}
890
891static void acm_tty_throttle(struct tty_struct *tty)
892{
893 struct acm *acm = tty->driver_data;
894
895 spin_lock_irq(&acm->read_lock);
896 acm->throttle_req = 1;
897 spin_unlock_irq(&acm->read_lock);
898}
899
900static void acm_tty_unthrottle(struct tty_struct *tty)
901{
902 struct acm *acm = tty->driver_data;
903 unsigned int was_throttled;
904
905 spin_lock_irq(&acm->read_lock);
906 was_throttled = acm->throttled;
907 acm->throttled = 0;
908 acm->throttle_req = 0;
909 spin_unlock_irq(&acm->read_lock);
910
911 if (was_throttled)
912 acm_submit_read_urbs(acm, GFP_KERNEL);
913}
914
915static int acm_tty_break_ctl(struct tty_struct *tty, int state)
916{
917 struct acm *acm = tty->driver_data;
918 int retval;
919
920 retval = acm_send_break(acm, state ? 0xffff : 0);
921 if (retval < 0)
922 dev_dbg(&acm->control->dev,
923 "%s - send break failed\n", __func__);
924 return retval;
925}
926
927static int acm_tty_tiocmget(struct tty_struct *tty)
928{
929 struct acm *acm = tty->driver_data;
930
931 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
932 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
933 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
934 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
935 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
936 TIOCM_CTS;
937}
938
939static int acm_tty_tiocmset(struct tty_struct *tty,
940 unsigned int set, unsigned int clear)
941{
942 struct acm *acm = tty->driver_data;
943 unsigned int newctrl;
944
945 newctrl = acm->ctrlout;
946 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
947 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
948 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
949 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
950
951 newctrl = (newctrl & ~clear) | set;
952
953 if (acm->ctrlout == newctrl)
954 return 0;
955 return acm_set_control(acm, acm->ctrlout = newctrl);
956}
957
958static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
959{
960 struct serial_struct tmp;
961
962 memset(&tmp, 0, sizeof(tmp));
963 tmp.xmit_fifo_size = acm->writesize;
964 tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
965 tmp.close_delay = acm->port.close_delay / 10;
966 tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
967 ASYNC_CLOSING_WAIT_NONE :
968 acm->port.closing_wait / 10;
969
970 if (copy_to_user(info, &tmp, sizeof(tmp)))
971 return -EFAULT;
972 else
973 return 0;
974}
975
976static int set_serial_info(struct acm *acm,
977 struct serial_struct __user *newinfo)
978{
979 struct serial_struct new_serial;
980 unsigned int closing_wait, close_delay;
981 int retval = 0;
982
983 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
984 return -EFAULT;
985
986 close_delay = new_serial.close_delay * 10;
987 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
988 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
989
990 mutex_lock(&acm->port.mutex);
991
992 if (!capable(CAP_SYS_ADMIN)) {
993 if ((close_delay != acm->port.close_delay) ||
994 (closing_wait != acm->port.closing_wait))
995 retval = -EPERM;
996 else
997 retval = -EOPNOTSUPP;
998 } else {
999 acm->port.close_delay = close_delay;
1000 acm->port.closing_wait = closing_wait;
1001 }
1002
1003 mutex_unlock(&acm->port.mutex);
1004 return retval;
1005}
1006
1007static int wait_serial_change(struct acm *acm, unsigned long arg)
1008{
1009 int rv = 0;
1010 DECLARE_WAITQUEUE(wait, current);
1011 struct async_icount old, new;
1012
1013 do {
1014 spin_lock_irq(&acm->read_lock);
1015 old = acm->oldcount;
1016 new = acm->iocount;
1017 acm->oldcount = new;
1018 spin_unlock_irq(&acm->read_lock);
1019
1020 if ((arg & TIOCM_DSR) &&
1021 old.dsr != new.dsr)
1022 break;
1023 if ((arg & TIOCM_CD) &&
1024 old.dcd != new.dcd)
1025 break;
1026 if ((arg & TIOCM_RI) &&
1027 old.rng != new.rng)
1028 break;
1029
1030 add_wait_queue(&acm->wioctl, &wait);
1031 set_current_state(TASK_INTERRUPTIBLE);
1032 schedule();
1033 remove_wait_queue(&acm->wioctl, &wait);
1034 if (acm->disconnected) {
1035 if (arg & TIOCM_CD)
1036 break;
1037 else
1038 rv = -ENODEV;
1039 } else {
1040 if (signal_pending(current))
1041 rv = -ERESTARTSYS;
1042 }
1043 } while (!rv);
1044
1045
1046
1047 return rv;
1048}
1049
1050static int acm_tty_get_icount(struct tty_struct *tty,
1051 struct serial_icounter_struct *icount)
1052{
1053 struct acm *acm = tty->driver_data;
1054
1055 icount->dsr = acm->iocount.dsr;
1056 icount->rng = acm->iocount.rng;
1057 icount->dcd = acm->iocount.dcd;
1058 icount->frame = acm->iocount.frame;
1059 icount->overrun = acm->iocount.overrun;
1060 icount->parity = acm->iocount.parity;
1061 icount->brk = acm->iocount.brk;
1062
1063 return 0;
1064}
1065
1066static int acm_tty_ioctl(struct tty_struct *tty,
1067 unsigned int cmd, unsigned long arg)
1068{
1069 struct acm *acm = tty->driver_data;
1070 int rv = -ENOIOCTLCMD;
1071
1072 switch (cmd) {
1073 case TIOCGSERIAL: /* gets serial port data */
1074 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
1075 break;
1076 case TIOCSSERIAL:
1077 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
1078 break;
1079 case TIOCMIWAIT:
1080 rv = usb_autopm_get_interface(acm->control);
1081 if (rv < 0) {
1082 rv = -EIO;
1083 break;
1084 }
1085 rv = wait_serial_change(acm, arg);
1086 usb_autopm_put_interface(acm->control);
1087 break;
1088 }
1089
1090 return rv;
1091}
1092
1093static void acm_tty_set_termios(struct tty_struct *tty,
1094 struct ktermios *termios_old)
1095{
1096 struct acm *acm = tty->driver_data;
1097 struct ktermios *termios = &tty->termios;
1098 struct usb_cdc_line_coding newline;
1099 int newctrl = acm->ctrlout;
1100
1101 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1102 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1103 newline.bParityType = termios->c_cflag & PARENB ?
1104 (termios->c_cflag & PARODD ? 1 : 2) +
1105 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1106 switch (termios->c_cflag & CSIZE) {
1107 case CS5:
1108 newline.bDataBits = 5;
1109 break;
1110 case CS6:
1111 newline.bDataBits = 6;
1112 break;
1113 case CS7:
1114 newline.bDataBits = 7;
1115 break;
1116 case CS8:
1117 default:
1118 newline.bDataBits = 8;
1119 break;
1120 }
1121 /* FIXME: Needs to clear unsupported bits in the termios */
1122 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1123
1124 if (C_BAUD(tty) == B0) {
1125 newline.dwDTERate = acm->line.dwDTERate;
1126 newctrl &= ~ACM_CTRL_DTR;
1127 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1128 newctrl |= ACM_CTRL_DTR;
1129 }
1130
1131 if (newctrl != acm->ctrlout)
1132 acm_set_control(acm, acm->ctrlout = newctrl);
1133
1134 if (memcmp(&acm->line, &newline, sizeof newline)) {
1135 memcpy(&acm->line, &newline, sizeof newline);
1136 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1137 __func__,
1138 le32_to_cpu(newline.dwDTERate),
1139 newline.bCharFormat, newline.bParityType,
1140 newline.bDataBits);
1141 acm_set_line(acm, &acm->line);
1142 }
1143}
1144
1145static const struct tty_port_operations acm_port_ops = {
1146 .dtr_rts = acm_port_dtr_rts,
1147 .shutdown = acm_port_shutdown,
1148 .activate = acm_port_activate,
1149 .destruct = acm_port_destruct,
1150};
1151
1152/*
1153 * USB probe and disconnect routines.
1154 */
1155
1156/* Little helpers: write/read buffers free */
1157static void acm_write_buffers_free(struct acm *acm)
1158{
1159 int i;
1160 struct acm_wb *wb;
1161
1162 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1163 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1164}
1165
1166static void acm_read_buffers_free(struct acm *acm)
1167{
1168 int i;
1169
1170 for (i = 0; i < acm->rx_buflimit; i++)
1171 usb_free_coherent(acm->dev, acm->readsize,
1172 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1173}
1174
1175/* Little helper: write buffers allocate */
1176static int acm_write_buffers_alloc(struct acm *acm)
1177{
1178 int i;
1179 struct acm_wb *wb;
1180
1181 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1182 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1183 &wb->dmah);
1184 if (!wb->buf) {
1185 while (i != 0) {
1186 --i;
1187 --wb;
1188 usb_free_coherent(acm->dev, acm->writesize,
1189 wb->buf, wb->dmah);
1190 }
1191 return -ENOMEM;
1192 }
1193 }
1194 return 0;
1195}
1196
1197static int acm_probe(struct usb_interface *intf,
1198 const struct usb_device_id *id)
1199{
1200 struct usb_cdc_union_desc *union_header = NULL;
1201 struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1202 unsigned char *buffer = intf->altsetting->extra;
1203 int buflen = intf->altsetting->extralen;
1204 struct usb_interface *control_interface;
1205 struct usb_interface *data_interface;
1206 struct usb_endpoint_descriptor *epctrl = NULL;
1207 struct usb_endpoint_descriptor *epread = NULL;
1208 struct usb_endpoint_descriptor *epwrite = NULL;
1209 struct usb_device *usb_dev = interface_to_usbdev(intf);
1210 struct usb_cdc_parsed_header h;
1211 struct acm *acm;
1212 int minor;
1213 int ctrlsize, readsize;
1214 u8 *buf;
1215 int call_intf_num = -1;
1216 int data_intf_num = -1;
1217 unsigned long quirks;
1218 int num_rx_buf;
1219 int i;
1220 int combined_interfaces = 0;
1221 struct device *tty_dev;
1222 int rv = -ENOMEM;
1223 int res;
1224
1225 /* normal quirks */
1226 quirks = (unsigned long)id->driver_info;
1227
1228 if (quirks == IGNORE_DEVICE)
1229 return -ENODEV;
1230
1231 memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1232
1233 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1234
1235 /* handle quirks deadly to normal probing*/
1236 if (quirks == NO_UNION_NORMAL) {
1237 data_interface = usb_ifnum_to_if(usb_dev, 1);
1238 control_interface = usb_ifnum_to_if(usb_dev, 0);
1239 /* we would crash */
1240 if (!data_interface || !control_interface)
1241 return -ENODEV;
1242 goto skip_normal_probe;
1243 }
1244
1245 /* normal probing*/
1246 if (!buffer) {
1247 dev_err(&intf->dev, "Weird descriptor references\n");
1248 return -EINVAL;
1249 }
1250
1251 if (!intf->cur_altsetting)
1252 return -EINVAL;
1253
1254 if (!buflen) {
1255 if (intf->cur_altsetting->endpoint &&
1256 intf->cur_altsetting->endpoint->extralen &&
1257 intf->cur_altsetting->endpoint->extra) {
1258 dev_dbg(&intf->dev,
1259 "Seeking extra descriptors on endpoint\n");
1260 buflen = intf->cur_altsetting->endpoint->extralen;
1261 buffer = intf->cur_altsetting->endpoint->extra;
1262 } else {
1263 dev_err(&intf->dev,
1264 "Zero length descriptor references\n");
1265 return -EINVAL;
1266 }
1267 }
1268
1269 cdc_parse_cdc_header(&h, intf, buffer, buflen);
1270 union_header = h.usb_cdc_union_desc;
1271 cmgmd = h.usb_cdc_call_mgmt_descriptor;
1272 if (cmgmd)
1273 call_intf_num = cmgmd->bDataInterface;
1274
1275 if (!union_header) {
1276 if (call_intf_num > 0) {
1277 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1278 /* quirks for Droids MuIn LCD */
1279 if (quirks & NO_DATA_INTERFACE) {
1280 data_interface = usb_ifnum_to_if(usb_dev, 0);
1281 } else {
1282 data_intf_num = call_intf_num;
1283 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1284 }
1285 control_interface = intf;
1286 } else {
1287 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1288 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1289 return -ENODEV;
1290 } else {
1291 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1292 combined_interfaces = 1;
1293 control_interface = data_interface = intf;
1294 goto look_for_collapsed_interface;
1295 }
1296 }
1297 } else {
1298 data_intf_num = union_header->bSlaveInterface0;
1299 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1300 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1301 }
1302
1303 if (!control_interface || !data_interface) {
1304 dev_dbg(&intf->dev, "no interfaces\n");
1305 return -ENODEV;
1306 }
1307 if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1308 return -ENODEV;
1309
1310 if (data_intf_num != call_intf_num)
1311 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1312
1313 if (control_interface == data_interface) {
1314 /* some broken devices designed for windows work this way */
1315 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1316 combined_interfaces = 1;
1317 /* a popular other OS doesn't use it */
1318 quirks |= NO_CAP_LINE;
1319 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1320 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1321 return -EINVAL;
1322 }
1323look_for_collapsed_interface:
1324 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1325 &epread, &epwrite, &epctrl, NULL);
1326 if (res)
1327 return res;
1328
1329 goto made_compressed_probe;
1330 }
1331
1332skip_normal_probe:
1333
1334 /*workaround for switched interfaces */
1335 if (data_interface->cur_altsetting->desc.bInterfaceClass
1336 != CDC_DATA_INTERFACE_TYPE) {
1337 if (control_interface->cur_altsetting->desc.bInterfaceClass
1338 == CDC_DATA_INTERFACE_TYPE) {
1339 dev_dbg(&intf->dev,
1340 "Your device has switched interfaces.\n");
1341 swap(control_interface, data_interface);
1342 } else {
1343 return -EINVAL;
1344 }
1345 }
1346
1347 /* Accept probe requests only for the control interface */
1348 if (!combined_interfaces && intf != control_interface)
1349 return -ENODEV;
1350
1351 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1352 /* valid in this context */
1353 dev_dbg(&intf->dev, "The data interface isn't available\n");
1354 return -EBUSY;
1355 }
1356
1357
1358 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1359 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1360 return -EINVAL;
1361
1362 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1363 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1364 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1365
1366
1367 /* workaround for switched endpoints */
1368 if (!usb_endpoint_dir_in(epread)) {
1369 /* descriptors are swapped */
1370 dev_dbg(&intf->dev,
1371 "The data interface has switched endpoints\n");
1372 swap(epread, epwrite);
1373 }
1374made_compressed_probe:
1375 dev_dbg(&intf->dev, "interfaces are valid\n");
1376
1377 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1378 if (acm == NULL)
1379 goto alloc_fail;
1380
1381 minor = acm_alloc_minor(acm);
1382 if (minor < 0)
1383 goto alloc_fail1;
1384
1385 ctrlsize = usb_endpoint_maxp(epctrl);
1386 readsize = usb_endpoint_maxp(epread) *
1387 (quirks == SINGLE_RX_URB ? 1 : 2);
1388 acm->combined_interfaces = combined_interfaces;
1389 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1390 acm->control = control_interface;
1391 acm->data = data_interface;
1392 acm->minor = minor;
1393 acm->dev = usb_dev;
1394 if (h.usb_cdc_acm_descriptor)
1395 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1396 if (quirks & NO_CAP_LINE)
1397 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1398 acm->ctrlsize = ctrlsize;
1399 acm->readsize = readsize;
1400 acm->rx_buflimit = num_rx_buf;
1401 INIT_WORK(&acm->work, acm_softint);
1402 init_waitqueue_head(&acm->wioctl);
1403 spin_lock_init(&acm->write_lock);
1404 spin_lock_init(&acm->read_lock);
1405 mutex_init(&acm->mutex);
1406 if (usb_endpoint_xfer_int(epread)) {
1407 acm->bInterval = epread->bInterval;
1408 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1409 } else {
1410 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1411 }
1412 if (usb_endpoint_xfer_int(epwrite))
1413 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1414 else
1415 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1416 tty_port_init(&acm->port);
1417 acm->port.ops = &acm_port_ops;
1418 init_usb_anchor(&acm->delayed);
1419 acm->quirks = quirks;
1420
1421 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1422 if (!buf)
1423 goto alloc_fail2;
1424 acm->ctrl_buffer = buf;
1425
1426 if (acm_write_buffers_alloc(acm) < 0)
1427 goto alloc_fail4;
1428
1429 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1430 if (!acm->ctrlurb)
1431 goto alloc_fail5;
1432
1433 for (i = 0; i < num_rx_buf; i++) {
1434 struct acm_rb *rb = &(acm->read_buffers[i]);
1435 struct urb *urb;
1436
1437 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1438 &rb->dma);
1439 if (!rb->base)
1440 goto alloc_fail6;
1441 rb->index = i;
1442 rb->instance = acm;
1443
1444 urb = usb_alloc_urb(0, GFP_KERNEL);
1445 if (!urb)
1446 goto alloc_fail6;
1447
1448 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1449 urb->transfer_dma = rb->dma;
1450 if (usb_endpoint_xfer_int(epread))
1451 usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1452 acm->readsize,
1453 acm_read_bulk_callback, rb,
1454 acm->bInterval);
1455 else
1456 usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1457 acm->readsize,
1458 acm_read_bulk_callback, rb);
1459
1460 acm->read_urbs[i] = urb;
1461 __set_bit(i, &acm->read_urbs_free);
1462 }
1463 for (i = 0; i < ACM_NW; i++) {
1464 struct acm_wb *snd = &(acm->wb[i]);
1465
1466 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1467 if (snd->urb == NULL)
1468 goto alloc_fail7;
1469
1470 if (usb_endpoint_xfer_int(epwrite))
1471 usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1472 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1473 else
1474 usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1475 NULL, acm->writesize, acm_write_bulk, snd);
1476 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1477 if (quirks & SEND_ZERO_PACKET)
1478 snd->urb->transfer_flags |= URB_ZERO_PACKET;
1479 snd->instance = acm;
1480 }
1481
1482 usb_set_intfdata(intf, acm);
1483
1484 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1485 if (i < 0)
1486 goto alloc_fail7;
1487
1488 if (h.usb_cdc_country_functional_desc) { /* export the country data */
1489 struct usb_cdc_country_functional_desc * cfd =
1490 h.usb_cdc_country_functional_desc;
1491
1492 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1493 if (!acm->country_codes)
1494 goto skip_countries;
1495 acm->country_code_size = cfd->bLength - 4;
1496 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1497 cfd->bLength - 4);
1498 acm->country_rel_date = cfd->iCountryCodeRelDate;
1499
1500 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1501 if (i < 0) {
1502 kfree(acm->country_codes);
1503 acm->country_codes = NULL;
1504 acm->country_code_size = 0;
1505 goto skip_countries;
1506 }
1507
1508 i = device_create_file(&intf->dev,
1509 &dev_attr_iCountryCodeRelDate);
1510 if (i < 0) {
1511 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1512 kfree(acm->country_codes);
1513 acm->country_codes = NULL;
1514 acm->country_code_size = 0;
1515 goto skip_countries;
1516 }
1517 }
1518
1519skip_countries:
1520 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1521 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1522 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1523 /* works around buggy devices */
1524 epctrl->bInterval ? epctrl->bInterval : 16);
1525 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1526 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1527 acm->notification_buffer = NULL;
1528 acm->nb_index = 0;
1529 acm->nb_size = 0;
1530
1531 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1532
1533 acm->line.dwDTERate = cpu_to_le32(9600);
1534 acm->line.bDataBits = 8;
1535 acm_set_line(acm, &acm->line);
1536
1537 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1538 usb_set_intfdata(data_interface, acm);
1539
1540 usb_get_intf(control_interface);
1541 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1542 &control_interface->dev);
1543 if (IS_ERR(tty_dev)) {
1544 rv = PTR_ERR(tty_dev);
1545 goto alloc_fail8;
1546 }
1547
1548 if (quirks & CLEAR_HALT_CONDITIONS) {
1549 usb_clear_halt(usb_dev, acm->in);
1550 usb_clear_halt(usb_dev, acm->out);
1551 }
1552
1553 return 0;
1554alloc_fail8:
1555 if (acm->country_codes) {
1556 device_remove_file(&acm->control->dev,
1557 &dev_attr_wCountryCodes);
1558 device_remove_file(&acm->control->dev,
1559 &dev_attr_iCountryCodeRelDate);
1560 kfree(acm->country_codes);
1561 }
1562 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1563alloc_fail7:
1564 usb_set_intfdata(intf, NULL);
1565 for (i = 0; i < ACM_NW; i++)
1566 usb_free_urb(acm->wb[i].urb);
1567alloc_fail6:
1568 for (i = 0; i < num_rx_buf; i++)
1569 usb_free_urb(acm->read_urbs[i]);
1570 acm_read_buffers_free(acm);
1571 usb_free_urb(acm->ctrlurb);
1572alloc_fail5:
1573 acm_write_buffers_free(acm);
1574alloc_fail4:
1575 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1576alloc_fail2:
1577 acm_release_minor(acm);
1578alloc_fail1:
1579 kfree(acm);
1580alloc_fail:
1581 return rv;
1582}
1583
1584static void acm_disconnect(struct usb_interface *intf)
1585{
1586 struct acm *acm = usb_get_intfdata(intf);
1587 struct tty_struct *tty;
1588
1589 /* sibling interface is already cleaning up */
1590 if (!acm)
1591 return;
1592
1593 mutex_lock(&acm->mutex);
1594 acm->disconnected = true;
1595 if (acm->country_codes) {
1596 device_remove_file(&acm->control->dev,
1597 &dev_attr_wCountryCodes);
1598 device_remove_file(&acm->control->dev,
1599 &dev_attr_iCountryCodeRelDate);
1600 }
1601 wake_up_all(&acm->wioctl);
1602 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1603 usb_set_intfdata(acm->control, NULL);
1604 usb_set_intfdata(acm->data, NULL);
1605 mutex_unlock(&acm->mutex);
1606
1607 tty = tty_port_tty_get(&acm->port);
1608 if (tty) {
1609 tty_vhangup(tty);
1610 tty_kref_put(tty);
1611 }
1612
1613 acm_kill_urbs(acm);
1614 cancel_work_sync(&acm->work);
1615
1616 tty_unregister_device(acm_tty_driver, acm->minor);
1617
1618 acm_write_buffers_free(acm);
1619 usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1620 acm_read_buffers_free(acm);
1621
1622 kfree(acm->notification_buffer);
1623
1624 if (!acm->combined_interfaces)
1625 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1626 acm->data : acm->control);
1627
1628 tty_port_put(&acm->port);
1629}
1630
1631#ifdef CONFIG_PM
1632static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1633{
1634 struct acm *acm = usb_get_intfdata(intf);
1635 int cnt;
1636
1637 spin_lock_irq(&acm->write_lock);
1638 if (PMSG_IS_AUTO(message)) {
1639 if (acm->transmitting) {
1640 spin_unlock_irq(&acm->write_lock);
1641 return -EBUSY;
1642 }
1643 }
1644 cnt = acm->susp_count++;
1645 spin_unlock_irq(&acm->write_lock);
1646
1647 if (cnt)
1648 return 0;
1649
1650 acm_kill_urbs(acm);
1651 cancel_work_sync(&acm->work);
1652
1653 return 0;
1654}
1655
1656static int acm_resume(struct usb_interface *intf)
1657{
1658 struct acm *acm = usb_get_intfdata(intf);
1659 struct urb *urb;
1660 int rv = 0;
1661
1662 spin_lock_irq(&acm->write_lock);
1663
1664 if (--acm->susp_count)
1665 goto out;
1666
1667 if (tty_port_initialized(&acm->port)) {
1668 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1669
1670 for (;;) {
1671 urb = usb_get_from_anchor(&acm->delayed);
1672 if (!urb)
1673 break;
1674
1675 acm_start_wb(acm, urb->context);
1676 }
1677
1678 /*
1679 * delayed error checking because we must
1680 * do the write path at all cost
1681 */
1682 if (rv < 0)
1683 goto out;
1684
1685 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1686 }
1687out:
1688 spin_unlock_irq(&acm->write_lock);
1689
1690 return rv;
1691}
1692
1693static int acm_reset_resume(struct usb_interface *intf)
1694{
1695 struct acm *acm = usb_get_intfdata(intf);
1696
1697 if (tty_port_initialized(&acm->port))
1698 tty_port_tty_hangup(&acm->port, false);
1699
1700 return acm_resume(intf);
1701}
1702
1703#endif /* CONFIG_PM */
1704
1705static int acm_pre_reset(struct usb_interface *intf)
1706{
1707 struct acm *acm = usb_get_intfdata(intf);
1708
1709 clear_bit(EVENT_RX_STALL, &acm->flags);
1710
1711 return 0;
1712}
1713
1714#define NOKIA_PCSUITE_ACM_INFO(x) \
1715 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1716 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1717 USB_CDC_ACM_PROTO_VENDOR)
1718
1719#define SAMSUNG_PCSUITE_ACM_INFO(x) \
1720 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1721 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1722 USB_CDC_ACM_PROTO_VENDOR)
1723
1724/*
1725 * USB driver structure.
1726 */
1727
1728static const struct usb_device_id acm_ids[] = {
1729 /* quirky and broken devices */
1730 { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1731 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1732 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1733 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1734 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1735 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1736 },
1737 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1738 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1739 },
1740 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1741 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1742 },
1743 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1744 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1745 },
1746 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1747 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1748 },
1749 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1750 .driver_info = SINGLE_RX_URB,
1751 },
1752 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1753 .driver_info = SINGLE_RX_URB, /* firmware bug */
1754 },
1755 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1756 .driver_info = SINGLE_RX_URB, /* firmware bug */
1757 },
1758 { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1759 .driver_info = SINGLE_RX_URB,
1760 },
1761 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1762 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1763 },
1764 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1765 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1766 },
1767 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1768 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1769 },
1770 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1771 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1772 },
1773 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1774 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1775 },
1776 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1777 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1778 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1779 { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1780 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1781 },
1782 /* Motorola H24 HSPA module: */
1783 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1784 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1785 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1786 },
1787 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1788 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1789 },
1790 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1791 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1792 },
1793 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1794 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1795 },
1796 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1797 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1798 },
1799 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1800 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1801 },
1802 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1803 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1804 },
1805
1806 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1807 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1808 data interface instead of
1809 communications interface.
1810 Maybe we should define a new
1811 quirk for this. */
1812 },
1813 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1814 .driver_info = NO_UNION_NORMAL,
1815 },
1816 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1817 .driver_info = NO_UNION_NORMAL,
1818 },
1819 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1820 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1821 },
1822 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1823 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1824 },
1825 { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1826 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1827 },
1828 { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1829 .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1830 },
1831
1832 { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1833 .driver_info = CLEAR_HALT_CONDITIONS,
1834 },
1835
1836 /* Nokia S60 phones expose two ACM channels. The first is
1837 * a modem and is picked up by the standard AT-command
1838 * information below. The second is 'vendor-specific' but
1839 * is treated as a serial device at the S60 end, so we want
1840 * to expose it on Linux too. */
1841 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1842 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1843 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1844 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1845 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1846 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1847 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1848 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1849 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1850 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1851 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1852 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1853 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1854 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1855 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1856 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1857 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1858 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1859 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1860 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1861 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1862 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1863 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1864 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1865 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1866 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1867 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1868 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1869 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1870 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1871 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1872 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1873 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1874 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1875 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1876 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1877 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1878 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1879 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1880 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1881 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1882 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1883 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1884 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1885 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1886 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1887 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1888 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1889 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1890 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1891 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1892 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1893 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1894 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1895 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1896 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1897 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1898 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1899
1900 /* Support for Owen devices */
1901 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1902
1903 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1904
1905 /* Support for Droids MuIn LCD */
1906 { USB_DEVICE(0x04d8, 0x000b),
1907 .driver_info = NO_DATA_INTERFACE,
1908 },
1909
1910#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1911 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1912 .driver_info = IGNORE_DEVICE,
1913 },
1914 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1915 .driver_info = IGNORE_DEVICE,
1916 },
1917#endif
1918
1919 /*Samsung phone in firmware update mode */
1920 { USB_DEVICE(0x04e8, 0x685d),
1921 .driver_info = IGNORE_DEVICE,
1922 },
1923
1924 /* Exclude Infineon Flash Loader utility */
1925 { USB_DEVICE(0x058b, 0x0041),
1926 .driver_info = IGNORE_DEVICE,
1927 },
1928
1929 /* control interfaces without any protocol set */
1930 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1931 USB_CDC_PROTO_NONE) },
1932
1933 /* control interfaces with various AT-command sets */
1934 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1935 USB_CDC_ACM_PROTO_AT_V25TER) },
1936 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1937 USB_CDC_ACM_PROTO_AT_PCCA101) },
1938 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1939 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1940 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1941 USB_CDC_ACM_PROTO_AT_GSM) },
1942 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1943 USB_CDC_ACM_PROTO_AT_3G) },
1944 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1945 USB_CDC_ACM_PROTO_AT_CDMA) },
1946
1947 { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1948 .driver_info = SEND_ZERO_PACKET,
1949 },
1950
1951 { }
1952};
1953
1954MODULE_DEVICE_TABLE(usb, acm_ids);
1955
1956static struct usb_driver acm_driver = {
1957 .name = "cdc_acm",
1958 .probe = acm_probe,
1959 .disconnect = acm_disconnect,
1960#ifdef CONFIG_PM
1961 .suspend = acm_suspend,
1962 .resume = acm_resume,
1963 .reset_resume = acm_reset_resume,
1964#endif
1965 .pre_reset = acm_pre_reset,
1966 .id_table = acm_ids,
1967#ifdef CONFIG_PM
1968 .supports_autosuspend = 1,
1969#endif
1970 .disable_hub_initiated_lpm = 1,
1971};
1972
1973/*
1974 * TTY driver structures.
1975 */
1976
1977static const struct tty_operations acm_ops = {
1978 .install = acm_tty_install,
1979 .open = acm_tty_open,
1980 .close = acm_tty_close,
1981 .cleanup = acm_tty_cleanup,
1982 .hangup = acm_tty_hangup,
1983 .write = acm_tty_write,
1984 .put_char = acm_tty_put_char,
1985 .flush_chars = acm_tty_flush_chars,
1986 .write_room = acm_tty_write_room,
1987 .ioctl = acm_tty_ioctl,
1988 .throttle = acm_tty_throttle,
1989 .unthrottle = acm_tty_unthrottle,
1990 .chars_in_buffer = acm_tty_chars_in_buffer,
1991 .break_ctl = acm_tty_break_ctl,
1992 .set_termios = acm_tty_set_termios,
1993 .tiocmget = acm_tty_tiocmget,
1994 .tiocmset = acm_tty_tiocmset,
1995 .get_icount = acm_tty_get_icount,
1996};
1997
1998/*
1999 * Init / exit.
2000 */
2001
2002static int __init acm_init(void)
2003{
2004 int retval;
2005 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
2006 if (!acm_tty_driver)
2007 return -ENOMEM;
2008 acm_tty_driver->driver_name = "acm",
2009 acm_tty_driver->name = "ttyACM",
2010 acm_tty_driver->major = ACM_TTY_MAJOR,
2011 acm_tty_driver->minor_start = 0,
2012 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2013 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2014 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2015 acm_tty_driver->init_termios = tty_std_termios;
2016 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2017 HUPCL | CLOCAL;
2018 tty_set_operations(acm_tty_driver, &acm_ops);
2019
2020 retval = tty_register_driver(acm_tty_driver);
2021 if (retval) {
2022 put_tty_driver(acm_tty_driver);
2023 return retval;
2024 }
2025
2026 retval = usb_register(&acm_driver);
2027 if (retval) {
2028 tty_unregister_driver(acm_tty_driver);
2029 put_tty_driver(acm_tty_driver);
2030 return retval;
2031 }
2032
2033 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2034
2035 return 0;
2036}
2037
2038static void __exit acm_exit(void)
2039{
2040 usb_deregister(&acm_driver);
2041 tty_unregister_driver(acm_tty_driver);
2042 put_tty_driver(acm_tty_driver);
2043 idr_destroy(&acm_minors);
2044}
2045
2046module_init(acm_init);
2047module_exit(acm_exit);
2048
2049MODULE_AUTHOR(DRIVER_AUTHOR);
2050MODULE_DESCRIPTION(DRIVER_DESC);
2051MODULE_LICENSE("GPL");
2052MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);