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