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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_poison_urbs(struct acm *acm)
151{
152 int i;
153
154 usb_poison_urb(acm->ctrlurb);
155 for (i = 0; i < ACM_NW; i++)
156 usb_poison_urb(acm->wb[i].urb);
157 for (i = 0; i < acm->rx_buflimit; i++)
158 usb_poison_urb(acm->read_urbs[i]);
159}
160
161static void acm_unpoison_urbs(struct acm *acm)
162{
163 int i;
164
165 for (i = 0; i < acm->rx_buflimit; i++)
166 usb_unpoison_urb(acm->read_urbs[i]);
167 for (i = 0; i < ACM_NW; i++)
168 usb_unpoison_urb(acm->wb[i].urb);
169 usb_unpoison_urb(acm->ctrlurb);
170}
171
172
173/*
174 * Write buffer management.
175 * All of these assume proper locks taken by the caller.
176 */
177
178static int acm_wb_alloc(struct acm *acm)
179{
180 int i, wbn;
181 struct acm_wb *wb;
182
183 wbn = 0;
184 i = 0;
185 for (;;) {
186 wb = &acm->wb[wbn];
187 if (!wb->use) {
188 wb->use = true;
189 wb->len = 0;
190 return wbn;
191 }
192 wbn = (wbn + 1) % ACM_NW;
193 if (++i >= ACM_NW)
194 return -1;
195 }
196}
197
198static int acm_wb_is_avail(struct acm *acm)
199{
200 int i, n;
201 unsigned long flags;
202
203 n = ACM_NW;
204 spin_lock_irqsave(&acm->write_lock, flags);
205 for (i = 0; i < ACM_NW; i++)
206 if(acm->wb[i].use)
207 n--;
208 spin_unlock_irqrestore(&acm->write_lock, flags);
209 return n;
210}
211
212/*
213 * Finish write. Caller must hold acm->write_lock
214 */
215static void acm_write_done(struct acm *acm, struct acm_wb *wb)
216{
217 wb->use = false;
218 acm->transmitting--;
219 usb_autopm_put_interface_async(acm->control);
220}
221
222/*
223 * Poke write.
224 *
225 * the caller is responsible for locking
226 */
227
228static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
229{
230 int rc;
231
232 acm->transmitting++;
233
234 wb->urb->transfer_buffer = wb->buf;
235 wb->urb->transfer_dma = wb->dmah;
236 wb->urb->transfer_buffer_length = wb->len;
237 wb->urb->dev = acm->dev;
238
239 rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
240 if (rc < 0) {
241 if (rc != -EPERM)
242 dev_err(&acm->data->dev,
243 "%s - usb_submit_urb(write bulk) failed: %d\n",
244 __func__, rc);
245 acm_write_done(acm, wb);
246 }
247 return rc;
248}
249
250/*
251 * attributes exported through sysfs
252 */
253static ssize_t bmCapabilities_show
254(struct device *dev, struct device_attribute *attr, char *buf)
255{
256 struct usb_interface *intf = to_usb_interface(dev);
257 struct acm *acm = usb_get_intfdata(intf);
258
259 return sprintf(buf, "%d", acm->ctrl_caps);
260}
261static DEVICE_ATTR_RO(bmCapabilities);
262
263static ssize_t wCountryCodes_show
264(struct device *dev, struct device_attribute *attr, char *buf)
265{
266 struct usb_interface *intf = to_usb_interface(dev);
267 struct acm *acm = usb_get_intfdata(intf);
268
269 memcpy(buf, acm->country_codes, acm->country_code_size);
270 return acm->country_code_size;
271}
272
273static DEVICE_ATTR_RO(wCountryCodes);
274
275static ssize_t iCountryCodeRelDate_show
276(struct device *dev, struct device_attribute *attr, char *buf)
277{
278 struct usb_interface *intf = to_usb_interface(dev);
279 struct acm *acm = usb_get_intfdata(intf);
280
281 return sprintf(buf, "%d", acm->country_rel_date);
282}
283
284static DEVICE_ATTR_RO(iCountryCodeRelDate);
285/*
286 * Interrupt handlers for various ACM device responses
287 */
288
289static void acm_process_notification(struct acm *acm, unsigned char *buf)
290{
291 int newctrl;
292 int difference;
293 unsigned long flags;
294 struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
295 unsigned char *data = buf + sizeof(struct usb_cdc_notification);
296
297 switch (dr->bNotificationType) {
298 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
299 dev_dbg(&acm->control->dev,
300 "%s - network connection: %d\n", __func__, dr->wValue);
301 break;
302
303 case USB_CDC_NOTIFY_SERIAL_STATE:
304 if (le16_to_cpu(dr->wLength) != 2) {
305 dev_dbg(&acm->control->dev,
306 "%s - malformed serial state\n", __func__);
307 break;
308 }
309
310 newctrl = get_unaligned_le16(data);
311 dev_dbg(&acm->control->dev,
312 "%s - serial state: 0x%x\n", __func__, newctrl);
313
314 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
315 dev_dbg(&acm->control->dev,
316 "%s - calling hangup\n", __func__);
317 tty_port_tty_hangup(&acm->port, false);
318 }
319
320 difference = acm->ctrlin ^ newctrl;
321 spin_lock_irqsave(&acm->read_lock, flags);
322 acm->ctrlin = newctrl;
323 acm->oldcount = acm->iocount;
324
325 if (difference & ACM_CTRL_DSR)
326 acm->iocount.dsr++;
327 if (difference & ACM_CTRL_DCD)
328 acm->iocount.dcd++;
329 if (newctrl & ACM_CTRL_BRK) {
330 acm->iocount.brk++;
331 tty_insert_flip_char(&acm->port, 0, TTY_BREAK);
332 }
333 if (newctrl & ACM_CTRL_RI)
334 acm->iocount.rng++;
335 if (newctrl & ACM_CTRL_FRAMING)
336 acm->iocount.frame++;
337 if (newctrl & ACM_CTRL_PARITY)
338 acm->iocount.parity++;
339 if (newctrl & ACM_CTRL_OVERRUN)
340 acm->iocount.overrun++;
341 spin_unlock_irqrestore(&acm->read_lock, flags);
342
343 if (newctrl & ACM_CTRL_BRK)
344 tty_flip_buffer_push(&acm->port);
345
346 if (difference)
347 wake_up_all(&acm->wioctl);
348
349 break;
350
351 default:
352 dev_dbg(&acm->control->dev,
353 "%s - unknown notification %d received: index %d len %d\n",
354 __func__,
355 dr->bNotificationType, dr->wIndex, dr->wLength);
356 }
357}
358
359/* control interface reports status changes with "interrupt" transfers */
360static void acm_ctrl_irq(struct urb *urb)
361{
362 struct acm *acm = urb->context;
363 struct usb_cdc_notification *dr = urb->transfer_buffer;
364 unsigned int current_size = urb->actual_length;
365 unsigned int expected_size, copy_size, alloc_size;
366 int retval;
367 int status = urb->status;
368
369 switch (status) {
370 case 0:
371 /* success */
372 break;
373 case -ECONNRESET:
374 case -ENOENT:
375 case -ESHUTDOWN:
376 /* this urb is terminated, clean up */
377 dev_dbg(&acm->control->dev,
378 "%s - urb shutting down with status: %d\n",
379 __func__, status);
380 return;
381 default:
382 dev_dbg(&acm->control->dev,
383 "%s - nonzero urb status received: %d\n",
384 __func__, status);
385 goto exit;
386 }
387
388 usb_mark_last_busy(acm->dev);
389
390 if (acm->nb_index)
391 dr = (struct usb_cdc_notification *)acm->notification_buffer;
392
393 /* size = notification-header + (optional) data */
394 expected_size = sizeof(struct usb_cdc_notification) +
395 le16_to_cpu(dr->wLength);
396
397 if (current_size < expected_size) {
398 /* notification is transmitted fragmented, reassemble */
399 if (acm->nb_size < expected_size) {
400 u8 *new_buffer;
401 alloc_size = roundup_pow_of_two(expected_size);
402 /* Final freeing is done on disconnect. */
403 new_buffer = krealloc(acm->notification_buffer,
404 alloc_size, GFP_ATOMIC);
405 if (!new_buffer) {
406 acm->nb_index = 0;
407 goto exit;
408 }
409
410 acm->notification_buffer = new_buffer;
411 acm->nb_size = alloc_size;
412 dr = (struct usb_cdc_notification *)acm->notification_buffer;
413 }
414
415 copy_size = min(current_size,
416 expected_size - acm->nb_index);
417
418 memcpy(&acm->notification_buffer[acm->nb_index],
419 urb->transfer_buffer, copy_size);
420 acm->nb_index += copy_size;
421 current_size = acm->nb_index;
422 }
423
424 if (current_size >= expected_size) {
425 /* notification complete */
426 acm_process_notification(acm, (unsigned char *)dr);
427 acm->nb_index = 0;
428 }
429
430exit:
431 retval = usb_submit_urb(urb, GFP_ATOMIC);
432 if (retval && retval != -EPERM && retval != -ENODEV)
433 dev_err(&acm->control->dev,
434 "%s - usb_submit_urb failed: %d\n", __func__, retval);
435 else
436 dev_vdbg(&acm->control->dev,
437 "control resubmission terminated %d\n", retval);
438}
439
440static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
441{
442 int res;
443
444 if (!test_and_clear_bit(index, &acm->read_urbs_free))
445 return 0;
446
447 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
448 if (res) {
449 if (res != -EPERM && res != -ENODEV) {
450 dev_err(&acm->data->dev,
451 "urb %d failed submission with %d\n",
452 index, res);
453 } else {
454 dev_vdbg(&acm->data->dev, "intended failure %d\n", res);
455 }
456 set_bit(index, &acm->read_urbs_free);
457 return res;
458 } else {
459 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
460 }
461
462 return 0;
463}
464
465static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
466{
467 int res;
468 int i;
469
470 for (i = 0; i < acm->rx_buflimit; ++i) {
471 res = acm_submit_read_urb(acm, i, mem_flags);
472 if (res)
473 return res;
474 }
475
476 return 0;
477}
478
479static void acm_process_read_urb(struct acm *acm, struct urb *urb)
480{
481 unsigned long flags;
482
483 if (!urb->actual_length)
484 return;
485
486 spin_lock_irqsave(&acm->read_lock, flags);
487 tty_insert_flip_string(&acm->port, urb->transfer_buffer,
488 urb->actual_length);
489 spin_unlock_irqrestore(&acm->read_lock, flags);
490
491 tty_flip_buffer_push(&acm->port);
492}
493
494static void acm_read_bulk_callback(struct urb *urb)
495{
496 struct acm_rb *rb = urb->context;
497 struct acm *acm = rb->instance;
498 int status = urb->status;
499 bool stopped = false;
500 bool stalled = false;
501 bool cooldown = false;
502
503 dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
504 rb->index, urb->actual_length, status);
505
506 switch (status) {
507 case 0:
508 usb_mark_last_busy(acm->dev);
509 acm_process_read_urb(acm, urb);
510 break;
511 case -EPIPE:
512 set_bit(EVENT_RX_STALL, &acm->flags);
513 stalled = true;
514 break;
515 case -ENOENT:
516 case -ECONNRESET:
517 case -ESHUTDOWN:
518 dev_dbg(&acm->data->dev,
519 "%s - urb shutting down with status: %d\n",
520 __func__, status);
521 stopped = true;
522 break;
523 case -EOVERFLOW:
524 case -EPROTO:
525 dev_dbg(&acm->data->dev,
526 "%s - cooling babbling device\n", __func__);
527 usb_mark_last_busy(acm->dev);
528 set_bit(rb->index, &acm->urbs_in_error_delay);
529 set_bit(ACM_ERROR_DELAY, &acm->flags);
530 cooldown = true;
531 break;
532 default:
533 dev_dbg(&acm->data->dev,
534 "%s - nonzero urb status received: %d\n",
535 __func__, status);
536 break;
537 }
538
539 /*
540 * Make sure URB processing is done before marking as free to avoid
541 * racing with unthrottle() on another CPU. Matches the barriers
542 * implied by the test_and_clear_bit() in acm_submit_read_urb().
543 */
544 smp_mb__before_atomic();
545 set_bit(rb->index, &acm->read_urbs_free);
546 /*
547 * Make sure URB is marked as free before checking the throttled flag
548 * to avoid racing with unthrottle() on another CPU. Matches the
549 * smp_mb() in unthrottle().
550 */
551 smp_mb__after_atomic();
552
553 if (stopped || stalled || cooldown) {
554 if (stalled)
555 schedule_delayed_work(&acm->dwork, 0);
556 else if (cooldown)
557 schedule_delayed_work(&acm->dwork, HZ / 2);
558 return;
559 }
560
561 if (test_bit(ACM_THROTTLED, &acm->flags))
562 return;
563
564 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
565}
566
567/* data interface wrote those outgoing bytes */
568static void acm_write_bulk(struct urb *urb)
569{
570 struct acm_wb *wb = urb->context;
571 struct acm *acm = wb->instance;
572 unsigned long flags;
573 int status = urb->status;
574
575 if (status || (urb->actual_length != urb->transfer_buffer_length))
576 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
577 urb->actual_length,
578 urb->transfer_buffer_length,
579 status);
580
581 spin_lock_irqsave(&acm->write_lock, flags);
582 acm_write_done(acm, wb);
583 spin_unlock_irqrestore(&acm->write_lock, flags);
584 set_bit(EVENT_TTY_WAKEUP, &acm->flags);
585 schedule_delayed_work(&acm->dwork, 0);
586}
587
588static void acm_softint(struct work_struct *work)
589{
590 int i;
591 struct acm *acm = container_of(work, struct acm, dwork.work);
592
593 if (test_bit(EVENT_RX_STALL, &acm->flags)) {
594 smp_mb(); /* against acm_suspend() */
595 if (!acm->susp_count) {
596 for (i = 0; i < acm->rx_buflimit; i++)
597 usb_kill_urb(acm->read_urbs[i]);
598 usb_clear_halt(acm->dev, acm->in);
599 acm_submit_read_urbs(acm, GFP_KERNEL);
600 clear_bit(EVENT_RX_STALL, &acm->flags);
601 }
602 }
603
604 if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
605 for (i = 0; i < acm->rx_buflimit; i++)
606 if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
607 acm_submit_read_urb(acm, i, GFP_KERNEL);
608 }
609
610 if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
611 tty_port_tty_wakeup(&acm->port);
612}
613
614/*
615 * TTY handlers
616 */
617
618static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
619{
620 struct acm *acm;
621 int retval;
622
623 acm = acm_get_by_minor(tty->index);
624 if (!acm)
625 return -ENODEV;
626
627 retval = tty_standard_install(driver, tty);
628 if (retval)
629 goto error_init_termios;
630
631 /*
632 * Suppress initial echoing for some devices which might send data
633 * immediately after acm driver has been installed.
634 */
635 if (acm->quirks & DISABLE_ECHO)
636 tty->termios.c_lflag &= ~ECHO;
637
638 tty->driver_data = acm;
639
640 return 0;
641
642error_init_termios:
643 tty_port_put(&acm->port);
644 return retval;
645}
646
647static int acm_tty_open(struct tty_struct *tty, struct file *filp)
648{
649 struct acm *acm = tty->driver_data;
650
651 return tty_port_open(&acm->port, tty, filp);
652}
653
654static void acm_port_dtr_rts(struct tty_port *port, int raise)
655{
656 struct acm *acm = container_of(port, struct acm, port);
657 int val;
658 int res;
659
660 if (raise)
661 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
662 else
663 val = 0;
664
665 /* FIXME: add missing ctrlout locking throughout driver */
666 acm->ctrlout = val;
667
668 res = acm_set_control(acm, val);
669 if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
670 /* This is broken in too many devices to spam the logs */
671 dev_dbg(&acm->control->dev, "failed to set dtr/rts\n");
672}
673
674static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
675{
676 struct acm *acm = container_of(port, struct acm, port);
677 int retval = -ENODEV;
678 int i;
679
680 mutex_lock(&acm->mutex);
681 if (acm->disconnected)
682 goto disconnected;
683
684 retval = usb_autopm_get_interface(acm->control);
685 if (retval)
686 goto error_get_interface;
687
688 /*
689 * FIXME: Why do we need this? Allocating 64K of physically contiguous
690 * memory is really nasty...
691 */
692 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
693 acm->control->needs_remote_wakeup = 1;
694
695 acm->ctrlurb->dev = acm->dev;
696 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
697 if (retval) {
698 dev_err(&acm->control->dev,
699 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
700 goto error_submit_urb;
701 }
702
703 acm_tty_set_termios(tty, NULL);
704
705 /*
706 * Unthrottle device in case the TTY was closed while throttled.
707 */
708 clear_bit(ACM_THROTTLED, &acm->flags);
709
710 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
711 if (retval)
712 goto error_submit_read_urbs;
713
714 usb_autopm_put_interface(acm->control);
715
716 mutex_unlock(&acm->mutex);
717
718 return 0;
719
720error_submit_read_urbs:
721 for (i = 0; i < acm->rx_buflimit; i++)
722 usb_kill_urb(acm->read_urbs[i]);
723 usb_kill_urb(acm->ctrlurb);
724error_submit_urb:
725 usb_autopm_put_interface(acm->control);
726error_get_interface:
727disconnected:
728 mutex_unlock(&acm->mutex);
729
730 return usb_translate_errors(retval);
731}
732
733static void acm_port_destruct(struct tty_port *port)
734{
735 struct acm *acm = container_of(port, struct acm, port);
736
737 if (acm->minor != ACM_MINOR_INVALID)
738 acm_release_minor(acm);
739 usb_put_intf(acm->control);
740 kfree(acm->country_codes);
741 kfree(acm);
742}
743
744static void acm_port_shutdown(struct tty_port *port)
745{
746 struct acm *acm = container_of(port, struct acm, port);
747 struct urb *urb;
748 struct acm_wb *wb;
749
750 /*
751 * Need to grab write_lock to prevent race with resume, but no need to
752 * hold it due to the tty-port initialised flag.
753 */
754 acm_poison_urbs(acm);
755 spin_lock_irq(&acm->write_lock);
756 spin_unlock_irq(&acm->write_lock);
757
758 usb_autopm_get_interface_no_resume(acm->control);
759 acm->control->needs_remote_wakeup = 0;
760 usb_autopm_put_interface(acm->control);
761
762 for (;;) {
763 urb = usb_get_from_anchor(&acm->delayed);
764 if (!urb)
765 break;
766 wb = urb->context;
767 wb->use = false;
768 usb_autopm_put_interface_async(acm->control);
769 }
770
771 acm_unpoison_urbs(acm);
772
773}
774
775static void acm_tty_cleanup(struct tty_struct *tty)
776{
777 struct acm *acm = tty->driver_data;
778
779 tty_port_put(&acm->port);
780}
781
782static void acm_tty_hangup(struct tty_struct *tty)
783{
784 struct acm *acm = tty->driver_data;
785
786 tty_port_hangup(&acm->port);
787}
788
789static void acm_tty_close(struct tty_struct *tty, struct file *filp)
790{
791 struct acm *acm = tty->driver_data;
792
793 tty_port_close(&acm->port, tty, filp);
794}
795
796static int acm_tty_write(struct tty_struct *tty,
797 const unsigned char *buf, int count)
798{
799 struct acm *acm = tty->driver_data;
800 int stat;
801 unsigned long flags;
802 int wbn;
803 struct acm_wb *wb;
804
805 if (!count)
806 return 0;
807
808 dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
809
810 spin_lock_irqsave(&acm->write_lock, flags);
811 wbn = acm_wb_alloc(acm);
812 if (wbn < 0) {
813 spin_unlock_irqrestore(&acm->write_lock, flags);
814 return 0;
815 }
816 wb = &acm->wb[wbn];
817
818 if (!acm->dev) {
819 wb->use = false;
820 spin_unlock_irqrestore(&acm->write_lock, flags);
821 return -ENODEV;
822 }
823
824 count = (count > acm->writesize) ? acm->writesize : count;
825 dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
826 memcpy(wb->buf, buf, count);
827 wb->len = count;
828
829 stat = usb_autopm_get_interface_async(acm->control);
830 if (stat) {
831 wb->use = false;
832 spin_unlock_irqrestore(&acm->write_lock, flags);
833 return stat;
834 }
835
836 if (acm->susp_count) {
837 usb_anchor_urb(wb->urb, &acm->delayed);
838 spin_unlock_irqrestore(&acm->write_lock, flags);
839 return count;
840 }
841
842 stat = acm_start_wb(acm, wb);
843 spin_unlock_irqrestore(&acm->write_lock, flags);
844
845 if (stat < 0)
846 return stat;
847 return count;
848}
849
850static unsigned int acm_tty_write_room(struct tty_struct *tty)
851{
852 struct acm *acm = tty->driver_data;
853 /*
854 * Do not let the line discipline to know that we have a reserve,
855 * or it might get too enthusiastic.
856 */
857 return acm_wb_is_avail(acm) ? acm->writesize : 0;
858}
859
860static unsigned int acm_tty_chars_in_buffer(struct tty_struct *tty)
861{
862 struct acm *acm = tty->driver_data;
863 /*
864 * if the device was unplugged then any remaining characters fell out
865 * of the connector ;)
866 */
867 if (acm->disconnected)
868 return 0;
869 /*
870 * This is inaccurate (overcounts), but it works.
871 */
872 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
873}
874
875static void acm_tty_throttle(struct tty_struct *tty)
876{
877 struct acm *acm = tty->driver_data;
878
879 set_bit(ACM_THROTTLED, &acm->flags);
880}
881
882static void acm_tty_unthrottle(struct tty_struct *tty)
883{
884 struct acm *acm = tty->driver_data;
885
886 clear_bit(ACM_THROTTLED, &acm->flags);
887
888 /* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
889 smp_mb();
890
891 acm_submit_read_urbs(acm, GFP_KERNEL);
892}
893
894static int acm_tty_break_ctl(struct tty_struct *tty, int state)
895{
896 struct acm *acm = tty->driver_data;
897 int retval;
898
899 retval = acm_send_break(acm, state ? 0xffff : 0);
900 if (retval < 0)
901 dev_dbg(&acm->control->dev,
902 "%s - send break failed\n", __func__);
903 return retval;
904}
905
906static int acm_tty_tiocmget(struct tty_struct *tty)
907{
908 struct acm *acm = tty->driver_data;
909
910 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
911 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
912 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
913 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
914 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
915 TIOCM_CTS;
916}
917
918static int acm_tty_tiocmset(struct tty_struct *tty,
919 unsigned int set, unsigned int clear)
920{
921 struct acm *acm = tty->driver_data;
922 unsigned int newctrl;
923
924 newctrl = acm->ctrlout;
925 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
926 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
927 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
928 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
929
930 newctrl = (newctrl & ~clear) | set;
931
932 if (acm->ctrlout == newctrl)
933 return 0;
934 return acm_set_control(acm, acm->ctrlout = newctrl);
935}
936
937static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
938{
939 struct acm *acm = tty->driver_data;
940
941 ss->line = acm->minor;
942 ss->close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
943 ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
944 ASYNC_CLOSING_WAIT_NONE :
945 jiffies_to_msecs(acm->port.closing_wait) / 10;
946 return 0;
947}
948
949static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
950{
951 struct acm *acm = tty->driver_data;
952 unsigned int closing_wait, close_delay;
953 int retval = 0;
954
955 close_delay = msecs_to_jiffies(ss->close_delay * 10);
956 closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
957 ASYNC_CLOSING_WAIT_NONE :
958 msecs_to_jiffies(ss->closing_wait * 10);
959
960 mutex_lock(&acm->port.mutex);
961
962 if (!capable(CAP_SYS_ADMIN)) {
963 if ((close_delay != acm->port.close_delay) ||
964 (closing_wait != acm->port.closing_wait))
965 retval = -EPERM;
966 } else {
967 acm->port.close_delay = close_delay;
968 acm->port.closing_wait = closing_wait;
969 }
970
971 mutex_unlock(&acm->port.mutex);
972 return retval;
973}
974
975static int wait_serial_change(struct acm *acm, unsigned long arg)
976{
977 int rv = 0;
978 DECLARE_WAITQUEUE(wait, current);
979 struct async_icount old, new;
980
981 do {
982 spin_lock_irq(&acm->read_lock);
983 old = acm->oldcount;
984 new = acm->iocount;
985 acm->oldcount = new;
986 spin_unlock_irq(&acm->read_lock);
987
988 if ((arg & TIOCM_DSR) &&
989 old.dsr != new.dsr)
990 break;
991 if ((arg & TIOCM_CD) &&
992 old.dcd != new.dcd)
993 break;
994 if ((arg & TIOCM_RI) &&
995 old.rng != new.rng)
996 break;
997
998 add_wait_queue(&acm->wioctl, &wait);
999 set_current_state(TASK_INTERRUPTIBLE);
1000 schedule();
1001 remove_wait_queue(&acm->wioctl, &wait);
1002 if (acm->disconnected) {
1003 if (arg & TIOCM_CD)
1004 break;
1005 else
1006 rv = -ENODEV;
1007 } else {
1008 if (signal_pending(current))
1009 rv = -ERESTARTSYS;
1010 }
1011 } while (!rv);
1012
1013
1014
1015 return rv;
1016}
1017
1018static int acm_tty_get_icount(struct tty_struct *tty,
1019 struct serial_icounter_struct *icount)
1020{
1021 struct acm *acm = tty->driver_data;
1022
1023 icount->dsr = acm->iocount.dsr;
1024 icount->rng = acm->iocount.rng;
1025 icount->dcd = acm->iocount.dcd;
1026 icount->frame = acm->iocount.frame;
1027 icount->overrun = acm->iocount.overrun;
1028 icount->parity = acm->iocount.parity;
1029 icount->brk = acm->iocount.brk;
1030
1031 return 0;
1032}
1033
1034static int acm_tty_ioctl(struct tty_struct *tty,
1035 unsigned int cmd, unsigned long arg)
1036{
1037 struct acm *acm = tty->driver_data;
1038 int rv = -ENOIOCTLCMD;
1039
1040 switch (cmd) {
1041 case TIOCMIWAIT:
1042 rv = usb_autopm_get_interface(acm->control);
1043 if (rv < 0) {
1044 rv = -EIO;
1045 break;
1046 }
1047 rv = wait_serial_change(acm, arg);
1048 usb_autopm_put_interface(acm->control);
1049 break;
1050 }
1051
1052 return rv;
1053}
1054
1055static void acm_tty_set_termios(struct tty_struct *tty,
1056 struct ktermios *termios_old)
1057{
1058 struct acm *acm = tty->driver_data;
1059 struct ktermios *termios = &tty->termios;
1060 struct usb_cdc_line_coding newline;
1061 int newctrl = acm->ctrlout;
1062
1063 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1064 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1065 newline.bParityType = termios->c_cflag & PARENB ?
1066 (termios->c_cflag & PARODD ? 1 : 2) +
1067 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1068 newline.bDataBits = tty_get_char_size(termios->c_cflag);
1069
1070 /* FIXME: Needs to clear unsupported bits in the termios */
1071 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1072
1073 if (C_BAUD(tty) == B0) {
1074 newline.dwDTERate = acm->line.dwDTERate;
1075 newctrl &= ~ACM_CTRL_DTR;
1076 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1077 newctrl |= ACM_CTRL_DTR;
1078 }
1079
1080 if (newctrl != acm->ctrlout)
1081 acm_set_control(acm, acm->ctrlout = newctrl);
1082
1083 if (memcmp(&acm->line, &newline, sizeof newline)) {
1084 memcpy(&acm->line, &newline, sizeof newline);
1085 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1086 __func__,
1087 le32_to_cpu(newline.dwDTERate),
1088 newline.bCharFormat, newline.bParityType,
1089 newline.bDataBits);
1090 acm_set_line(acm, &acm->line);
1091 }
1092}
1093
1094static const struct tty_port_operations acm_port_ops = {
1095 .dtr_rts = acm_port_dtr_rts,
1096 .shutdown = acm_port_shutdown,
1097 .activate = acm_port_activate,
1098 .destruct = acm_port_destruct,
1099};
1100
1101/*
1102 * USB probe and disconnect routines.
1103 */
1104
1105/* Little helpers: write/read buffers free */
1106static void acm_write_buffers_free(struct acm *acm)
1107{
1108 int i;
1109 struct acm_wb *wb;
1110
1111 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1112 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1113}
1114
1115static void acm_read_buffers_free(struct acm *acm)
1116{
1117 int i;
1118
1119 for (i = 0; i < acm->rx_buflimit; i++)
1120 usb_free_coherent(acm->dev, acm->readsize,
1121 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1122}
1123
1124/* Little helper: write buffers allocate */
1125static int acm_write_buffers_alloc(struct acm *acm)
1126{
1127 int i;
1128 struct acm_wb *wb;
1129
1130 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1131 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1132 &wb->dmah);
1133 if (!wb->buf) {
1134 while (i != 0) {
1135 --i;
1136 --wb;
1137 usb_free_coherent(acm->dev, acm->writesize,
1138 wb->buf, wb->dmah);
1139 }
1140 return -ENOMEM;
1141 }
1142 }
1143 return 0;
1144}
1145
1146static int acm_probe(struct usb_interface *intf,
1147 const struct usb_device_id *id)
1148{
1149 struct usb_cdc_union_desc *union_header = NULL;
1150 struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1151 unsigned char *buffer = intf->altsetting->extra;
1152 int buflen = intf->altsetting->extralen;
1153 struct usb_interface *control_interface;
1154 struct usb_interface *data_interface;
1155 struct usb_endpoint_descriptor *epctrl = NULL;
1156 struct usb_endpoint_descriptor *epread = NULL;
1157 struct usb_endpoint_descriptor *epwrite = NULL;
1158 struct usb_device *usb_dev = interface_to_usbdev(intf);
1159 struct usb_cdc_parsed_header h;
1160 struct acm *acm;
1161 int minor;
1162 int ctrlsize, readsize;
1163 u8 *buf;
1164 int call_intf_num = -1;
1165 int data_intf_num = -1;
1166 unsigned long quirks;
1167 int num_rx_buf;
1168 int i;
1169 int combined_interfaces = 0;
1170 struct device *tty_dev;
1171 int rv = -ENOMEM;
1172 int res;
1173
1174 /* normal quirks */
1175 quirks = (unsigned long)id->driver_info;
1176
1177 if (quirks == IGNORE_DEVICE)
1178 return -ENODEV;
1179
1180 memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1181
1182 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1183
1184 /* handle quirks deadly to normal probing*/
1185 if (quirks == NO_UNION_NORMAL) {
1186 data_interface = usb_ifnum_to_if(usb_dev, 1);
1187 control_interface = usb_ifnum_to_if(usb_dev, 0);
1188 /* we would crash */
1189 if (!data_interface || !control_interface)
1190 return -ENODEV;
1191 goto skip_normal_probe;
1192 }
1193
1194 /* normal probing*/
1195 if (!buffer) {
1196 dev_err(&intf->dev, "Weird descriptor references\n");
1197 return -EINVAL;
1198 }
1199
1200 if (!buflen) {
1201 if (intf->cur_altsetting->endpoint &&
1202 intf->cur_altsetting->endpoint->extralen &&
1203 intf->cur_altsetting->endpoint->extra) {
1204 dev_dbg(&intf->dev,
1205 "Seeking extra descriptors on endpoint\n");
1206 buflen = intf->cur_altsetting->endpoint->extralen;
1207 buffer = intf->cur_altsetting->endpoint->extra;
1208 } else {
1209 dev_err(&intf->dev,
1210 "Zero length descriptor references\n");
1211 return -EINVAL;
1212 }
1213 }
1214
1215 cdc_parse_cdc_header(&h, intf, buffer, buflen);
1216 union_header = h.usb_cdc_union_desc;
1217 cmgmd = h.usb_cdc_call_mgmt_descriptor;
1218 if (cmgmd)
1219 call_intf_num = cmgmd->bDataInterface;
1220
1221 if (!union_header) {
1222 if (intf->cur_altsetting->desc.bNumEndpoints == 3) {
1223 dev_dbg(&intf->dev, "No union descriptor, assuming single interface\n");
1224 combined_interfaces = 1;
1225 control_interface = data_interface = intf;
1226 goto look_for_collapsed_interface;
1227 } else if (call_intf_num > 0) {
1228 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1229 data_intf_num = call_intf_num;
1230 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1231 control_interface = intf;
1232 } else {
1233 dev_dbg(&intf->dev, "No union descriptor, giving up\n");
1234 return -ENODEV;
1235 }
1236 } else {
1237 int class = -1;
1238
1239 data_intf_num = union_header->bSlaveInterface0;
1240 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1241 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1242
1243 if (control_interface)
1244 class = control_interface->cur_altsetting->desc.bInterfaceClass;
1245
1246 if (class != USB_CLASS_COMM && class != USB_CLASS_CDC_DATA) {
1247 dev_dbg(&intf->dev, "Broken union descriptor, assuming single interface\n");
1248 combined_interfaces = 1;
1249 control_interface = data_interface = intf;
1250 goto look_for_collapsed_interface;
1251 }
1252 }
1253
1254 if (!control_interface || !data_interface) {
1255 dev_dbg(&intf->dev, "no interfaces\n");
1256 return -ENODEV;
1257 }
1258
1259 if (data_intf_num != call_intf_num)
1260 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1261
1262 if (control_interface == data_interface) {
1263 /* some broken devices designed for windows work this way */
1264 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1265 combined_interfaces = 1;
1266 /* a popular other OS doesn't use it */
1267 quirks |= NO_CAP_LINE;
1268 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1269 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1270 return -EINVAL;
1271 }
1272look_for_collapsed_interface:
1273 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1274 &epread, &epwrite, &epctrl, NULL);
1275 if (res)
1276 return res;
1277
1278 goto made_compressed_probe;
1279 }
1280
1281skip_normal_probe:
1282
1283 /*workaround for switched interfaces */
1284 if (data_interface->cur_altsetting->desc.bInterfaceClass != USB_CLASS_CDC_DATA) {
1285 if (control_interface->cur_altsetting->desc.bInterfaceClass == USB_CLASS_CDC_DATA) {
1286 dev_dbg(&intf->dev,
1287 "Your device has switched interfaces.\n");
1288 swap(control_interface, data_interface);
1289 } else {
1290 return -EINVAL;
1291 }
1292 }
1293
1294 /* Accept probe requests only for the control interface */
1295 if (!combined_interfaces && intf != control_interface)
1296 return -ENODEV;
1297
1298 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1299 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1300 return -EINVAL;
1301
1302 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1303 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1304 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1305
1306
1307 /* workaround for switched endpoints */
1308 if (!usb_endpoint_dir_in(epread)) {
1309 /* descriptors are swapped */
1310 dev_dbg(&intf->dev,
1311 "The data interface has switched endpoints\n");
1312 swap(epread, epwrite);
1313 }
1314made_compressed_probe:
1315 dev_dbg(&intf->dev, "interfaces are valid\n");
1316
1317 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1318 if (!acm)
1319 return -ENOMEM;
1320
1321 tty_port_init(&acm->port);
1322 acm->port.ops = &acm_port_ops;
1323
1324 ctrlsize = usb_endpoint_maxp(epctrl);
1325 readsize = usb_endpoint_maxp(epread) *
1326 (quirks == SINGLE_RX_URB ? 1 : 2);
1327 acm->combined_interfaces = combined_interfaces;
1328 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1329 acm->control = control_interface;
1330 acm->data = data_interface;
1331
1332 usb_get_intf(acm->control); /* undone in destruct() */
1333
1334 minor = acm_alloc_minor(acm);
1335 if (minor < 0) {
1336 acm->minor = ACM_MINOR_INVALID;
1337 goto err_put_port;
1338 }
1339
1340 acm->minor = minor;
1341 acm->dev = usb_dev;
1342 if (h.usb_cdc_acm_descriptor)
1343 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1344 if (quirks & NO_CAP_LINE)
1345 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1346 acm->ctrlsize = ctrlsize;
1347 acm->readsize = readsize;
1348 acm->rx_buflimit = num_rx_buf;
1349 INIT_DELAYED_WORK(&acm->dwork, acm_softint);
1350 init_waitqueue_head(&acm->wioctl);
1351 spin_lock_init(&acm->write_lock);
1352 spin_lock_init(&acm->read_lock);
1353 mutex_init(&acm->mutex);
1354 if (usb_endpoint_xfer_int(epread)) {
1355 acm->bInterval = epread->bInterval;
1356 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1357 } else {
1358 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1359 }
1360 if (usb_endpoint_xfer_int(epwrite))
1361 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1362 else
1363 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1364 init_usb_anchor(&acm->delayed);
1365 acm->quirks = quirks;
1366
1367 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1368 if (!buf)
1369 goto err_put_port;
1370 acm->ctrl_buffer = buf;
1371
1372 if (acm_write_buffers_alloc(acm) < 0)
1373 goto err_free_ctrl_buffer;
1374
1375 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1376 if (!acm->ctrlurb)
1377 goto err_free_write_buffers;
1378
1379 for (i = 0; i < num_rx_buf; i++) {
1380 struct acm_rb *rb = &(acm->read_buffers[i]);
1381 struct urb *urb;
1382
1383 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1384 &rb->dma);
1385 if (!rb->base)
1386 goto err_free_read_urbs;
1387 rb->index = i;
1388 rb->instance = acm;
1389
1390 urb = usb_alloc_urb(0, GFP_KERNEL);
1391 if (!urb)
1392 goto err_free_read_urbs;
1393
1394 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1395 urb->transfer_dma = rb->dma;
1396 if (usb_endpoint_xfer_int(epread))
1397 usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1398 acm->readsize,
1399 acm_read_bulk_callback, rb,
1400 acm->bInterval);
1401 else
1402 usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1403 acm->readsize,
1404 acm_read_bulk_callback, rb);
1405
1406 acm->read_urbs[i] = urb;
1407 __set_bit(i, &acm->read_urbs_free);
1408 }
1409 for (i = 0; i < ACM_NW; i++) {
1410 struct acm_wb *snd = &(acm->wb[i]);
1411
1412 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1413 if (!snd->urb)
1414 goto err_free_write_urbs;
1415
1416 if (usb_endpoint_xfer_int(epwrite))
1417 usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1418 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1419 else
1420 usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1421 NULL, acm->writesize, acm_write_bulk, snd);
1422 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1423 if (quirks & SEND_ZERO_PACKET)
1424 snd->urb->transfer_flags |= URB_ZERO_PACKET;
1425 snd->instance = acm;
1426 }
1427
1428 usb_set_intfdata(intf, acm);
1429
1430 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1431 if (i < 0)
1432 goto err_free_write_urbs;
1433
1434 if (h.usb_cdc_country_functional_desc) { /* export the country data */
1435 struct usb_cdc_country_functional_desc * cfd =
1436 h.usb_cdc_country_functional_desc;
1437
1438 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1439 if (!acm->country_codes)
1440 goto skip_countries;
1441 acm->country_code_size = cfd->bLength - 4;
1442 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1443 cfd->bLength - 4);
1444 acm->country_rel_date = cfd->iCountryCodeRelDate;
1445
1446 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1447 if (i < 0) {
1448 kfree(acm->country_codes);
1449 acm->country_codes = NULL;
1450 acm->country_code_size = 0;
1451 goto skip_countries;
1452 }
1453
1454 i = device_create_file(&intf->dev,
1455 &dev_attr_iCountryCodeRelDate);
1456 if (i < 0) {
1457 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1458 kfree(acm->country_codes);
1459 acm->country_codes = NULL;
1460 acm->country_code_size = 0;
1461 goto skip_countries;
1462 }
1463 }
1464
1465skip_countries:
1466 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1467 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1468 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1469 /* works around buggy devices */
1470 epctrl->bInterval ? epctrl->bInterval : 16);
1471 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1472 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1473 acm->notification_buffer = NULL;
1474 acm->nb_index = 0;
1475 acm->nb_size = 0;
1476
1477 acm->line.dwDTERate = cpu_to_le32(9600);
1478 acm->line.bDataBits = 8;
1479 acm_set_line(acm, &acm->line);
1480
1481 if (!acm->combined_interfaces) {
1482 rv = usb_driver_claim_interface(&acm_driver, data_interface, acm);
1483 if (rv)
1484 goto err_remove_files;
1485 }
1486
1487 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1488 &control_interface->dev);
1489 if (IS_ERR(tty_dev)) {
1490 rv = PTR_ERR(tty_dev);
1491 goto err_release_data_interface;
1492 }
1493
1494 if (quirks & CLEAR_HALT_CONDITIONS) {
1495 usb_clear_halt(usb_dev, acm->in);
1496 usb_clear_halt(usb_dev, acm->out);
1497 }
1498
1499 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1500
1501 return 0;
1502
1503err_release_data_interface:
1504 if (!acm->combined_interfaces) {
1505 /* Clear driver data so that disconnect() returns early. */
1506 usb_set_intfdata(data_interface, NULL);
1507 usb_driver_release_interface(&acm_driver, data_interface);
1508 }
1509err_remove_files:
1510 if (acm->country_codes) {
1511 device_remove_file(&acm->control->dev,
1512 &dev_attr_wCountryCodes);
1513 device_remove_file(&acm->control->dev,
1514 &dev_attr_iCountryCodeRelDate);
1515 }
1516 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1517err_free_write_urbs:
1518 for (i = 0; i < ACM_NW; i++)
1519 usb_free_urb(acm->wb[i].urb);
1520err_free_read_urbs:
1521 for (i = 0; i < num_rx_buf; i++)
1522 usb_free_urb(acm->read_urbs[i]);
1523 acm_read_buffers_free(acm);
1524 usb_free_urb(acm->ctrlurb);
1525err_free_write_buffers:
1526 acm_write_buffers_free(acm);
1527err_free_ctrl_buffer:
1528 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1529err_put_port:
1530 tty_port_put(&acm->port);
1531
1532 return rv;
1533}
1534
1535static void acm_disconnect(struct usb_interface *intf)
1536{
1537 struct acm *acm = usb_get_intfdata(intf);
1538 struct tty_struct *tty;
1539 int i;
1540
1541 /* sibling interface is already cleaning up */
1542 if (!acm)
1543 return;
1544
1545 acm->disconnected = true;
1546 /*
1547 * there is a circular dependency. acm_softint() can resubmit
1548 * the URBs in error handling so we need to block any
1549 * submission right away
1550 */
1551 acm_poison_urbs(acm);
1552 mutex_lock(&acm->mutex);
1553 if (acm->country_codes) {
1554 device_remove_file(&acm->control->dev,
1555 &dev_attr_wCountryCodes);
1556 device_remove_file(&acm->control->dev,
1557 &dev_attr_iCountryCodeRelDate);
1558 }
1559 wake_up_all(&acm->wioctl);
1560 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1561 usb_set_intfdata(acm->control, NULL);
1562 usb_set_intfdata(acm->data, NULL);
1563 mutex_unlock(&acm->mutex);
1564
1565 tty = tty_port_tty_get(&acm->port);
1566 if (tty) {
1567 tty_vhangup(tty);
1568 tty_kref_put(tty);
1569 }
1570
1571 cancel_delayed_work_sync(&acm->dwork);
1572
1573 tty_unregister_device(acm_tty_driver, acm->minor);
1574
1575 usb_free_urb(acm->ctrlurb);
1576 for (i = 0; i < ACM_NW; i++)
1577 usb_free_urb(acm->wb[i].urb);
1578 for (i = 0; i < acm->rx_buflimit; i++)
1579 usb_free_urb(acm->read_urbs[i]);
1580 acm_write_buffers_free(acm);
1581 usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1582 acm_read_buffers_free(acm);
1583
1584 kfree(acm->notification_buffer);
1585
1586 if (!acm->combined_interfaces)
1587 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1588 acm->data : acm->control);
1589
1590 tty_port_put(&acm->port);
1591}
1592
1593#ifdef CONFIG_PM
1594static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1595{
1596 struct acm *acm = usb_get_intfdata(intf);
1597 int cnt;
1598
1599 spin_lock_irq(&acm->write_lock);
1600 if (PMSG_IS_AUTO(message)) {
1601 if (acm->transmitting) {
1602 spin_unlock_irq(&acm->write_lock);
1603 return -EBUSY;
1604 }
1605 }
1606 cnt = acm->susp_count++;
1607 spin_unlock_irq(&acm->write_lock);
1608
1609 if (cnt)
1610 return 0;
1611
1612 acm_poison_urbs(acm);
1613 cancel_delayed_work_sync(&acm->dwork);
1614 acm->urbs_in_error_delay = 0;
1615
1616 return 0;
1617}
1618
1619static int acm_resume(struct usb_interface *intf)
1620{
1621 struct acm *acm = usb_get_intfdata(intf);
1622 struct urb *urb;
1623 int rv = 0;
1624
1625 spin_lock_irq(&acm->write_lock);
1626
1627 if (--acm->susp_count)
1628 goto out;
1629
1630 acm_unpoison_urbs(acm);
1631
1632 if (tty_port_initialized(&acm->port)) {
1633 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1634
1635 for (;;) {
1636 urb = usb_get_from_anchor(&acm->delayed);
1637 if (!urb)
1638 break;
1639
1640 acm_start_wb(acm, urb->context);
1641 }
1642
1643 /*
1644 * delayed error checking because we must
1645 * do the write path at all cost
1646 */
1647 if (rv < 0)
1648 goto out;
1649
1650 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1651 }
1652out:
1653 spin_unlock_irq(&acm->write_lock);
1654
1655 return rv;
1656}
1657
1658static int acm_reset_resume(struct usb_interface *intf)
1659{
1660 struct acm *acm = usb_get_intfdata(intf);
1661
1662 if (tty_port_initialized(&acm->port))
1663 tty_port_tty_hangup(&acm->port, false);
1664
1665 return acm_resume(intf);
1666}
1667
1668#endif /* CONFIG_PM */
1669
1670static int acm_pre_reset(struct usb_interface *intf)
1671{
1672 struct acm *acm = usb_get_intfdata(intf);
1673
1674 clear_bit(EVENT_RX_STALL, &acm->flags);
1675 acm->nb_index = 0; /* pending control transfers are lost */
1676
1677 return 0;
1678}
1679
1680#define NOKIA_PCSUITE_ACM_INFO(x) \
1681 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1682 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1683 USB_CDC_ACM_PROTO_VENDOR)
1684
1685#define SAMSUNG_PCSUITE_ACM_INFO(x) \
1686 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1687 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1688 USB_CDC_ACM_PROTO_VENDOR)
1689
1690/*
1691 * USB driver structure.
1692 */
1693
1694static const struct usb_device_id acm_ids[] = {
1695 /* quirky and broken devices */
1696 { USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1697 .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
1698 { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1699 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1700 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1701 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1702 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1703 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1704 },
1705 { USB_DEVICE(0x045b, 0x023c), /* Renesas USB Download mode */
1706 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1707 },
1708 { USB_DEVICE(0x045b, 0x0248), /* Renesas USB Download mode */
1709 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1710 },
1711 { USB_DEVICE(0x045b, 0x024D), /* Renesas USB Download mode */
1712 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1713 },
1714 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1715 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1716 },
1717 { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1718 .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1719 },
1720 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1721 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1722 },
1723 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1724 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1725 },
1726 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1727 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1728 },
1729 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1730 .driver_info = SINGLE_RX_URB,
1731 },
1732 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1733 .driver_info = SINGLE_RX_URB, /* firmware bug */
1734 },
1735 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1736 .driver_info = SINGLE_RX_URB, /* firmware bug */
1737 },
1738 { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1739 .driver_info = SINGLE_RX_URB,
1740 },
1741 { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1742 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1743 },
1744 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1745 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1746 },
1747 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1748 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1749 },
1750 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1751 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1752 },
1753 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1754 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1755 },
1756 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1757 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1758 },
1759 { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1760 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1761 },
1762 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1763 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1764 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1765 { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1766 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1767 },
1768 /* Motorola H24 HSPA module: */
1769 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1770 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1771 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1772 },
1773 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1774 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1775 },
1776 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1777 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1778 },
1779 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1780 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1781 },
1782 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1783 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1784 },
1785 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1786 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1787 },
1788 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1789 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1790 },
1791
1792 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1793 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1794 data interface instead of
1795 communications interface.
1796 Maybe we should define a new
1797 quirk for this. */
1798 },
1799 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1800 .driver_info = NO_UNION_NORMAL,
1801 },
1802 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1803 .driver_info = NO_UNION_NORMAL,
1804 },
1805 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1806 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1807 },
1808 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1809 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1810 },
1811 { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1812 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1813 },
1814 { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1815 .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1816 },
1817 { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1818 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1819 },
1820
1821 { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1822 .driver_info = CLEAR_HALT_CONDITIONS,
1823 },
1824
1825 /* Nokia S60 phones expose two ACM channels. The first is
1826 * a modem and is picked up by the standard AT-command
1827 * information below. The second is 'vendor-specific' but
1828 * is treated as a serial device at the S60 end, so we want
1829 * to expose it on Linux too. */
1830 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1831 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1832 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1833 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1834 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1835 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1836 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1837 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1838 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1839 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1840 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1841 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1842 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1843 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1844 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1845 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1846 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1847 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1848 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1849 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1850 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1851 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1852 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1853 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1854 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1855 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1856 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1857 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1858 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1859 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1860 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1861 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1862 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1863 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1864 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1865 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1866 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1867 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1868 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1869 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1870 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1871 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1872 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1873 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1874 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1875 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1876 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1877 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1878 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1879 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1880 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1881 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1882 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1883 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1884 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1885 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1886 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1887 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1888
1889 /* Support for Owen devices */
1890 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1891
1892 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1893
1894#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1895 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1896 .driver_info = IGNORE_DEVICE,
1897 },
1898 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1899 .driver_info = IGNORE_DEVICE,
1900 },
1901#endif
1902
1903#if IS_ENABLED(CONFIG_IR_TOY)
1904 { USB_DEVICE(0x04d8, 0xfd08),
1905 .driver_info = IGNORE_DEVICE,
1906 },
1907
1908 { USB_DEVICE(0x04d8, 0xf58b),
1909 .driver_info = IGNORE_DEVICE,
1910 },
1911#endif
1912
1913#if IS_ENABLED(CONFIG_USB_SERIAL_XR)
1914 { USB_DEVICE(0x04e2, 0x1400), .driver_info = IGNORE_DEVICE },
1915 { USB_DEVICE(0x04e2, 0x1401), .driver_info = IGNORE_DEVICE },
1916 { USB_DEVICE(0x04e2, 0x1402), .driver_info = IGNORE_DEVICE },
1917 { USB_DEVICE(0x04e2, 0x1403), .driver_info = IGNORE_DEVICE },
1918 { USB_DEVICE(0x04e2, 0x1410), .driver_info = IGNORE_DEVICE },
1919 { USB_DEVICE(0x04e2, 0x1411), .driver_info = IGNORE_DEVICE },
1920 { USB_DEVICE(0x04e2, 0x1412), .driver_info = IGNORE_DEVICE },
1921 { USB_DEVICE(0x04e2, 0x1414), .driver_info = IGNORE_DEVICE },
1922 { USB_DEVICE(0x04e2, 0x1420), .driver_info = IGNORE_DEVICE },
1923 { USB_DEVICE(0x04e2, 0x1422), .driver_info = IGNORE_DEVICE },
1924 { USB_DEVICE(0x04e2, 0x1424), .driver_info = IGNORE_DEVICE },
1925#endif
1926
1927 /*Samsung phone in firmware update mode */
1928 { USB_DEVICE(0x04e8, 0x685d),
1929 .driver_info = IGNORE_DEVICE,
1930 },
1931
1932 /* Exclude Infineon Flash Loader utility */
1933 { USB_DEVICE(0x058b, 0x0041),
1934 .driver_info = IGNORE_DEVICE,
1935 },
1936
1937 /* Exclude ETAS ES58x */
1938 { USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
1939 .driver_info = IGNORE_DEVICE,
1940 },
1941 { USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
1942 .driver_info = IGNORE_DEVICE,
1943 },
1944 { USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
1945 .driver_info = IGNORE_DEVICE,
1946 },
1947
1948 { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1949 .driver_info = SEND_ZERO_PACKET,
1950 },
1951 { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1952 .driver_info = SEND_ZERO_PACKET,
1953 },
1954
1955 /* Exclude Goodix Fingerprint Reader */
1956 { USB_DEVICE(0x27c6, 0x5395),
1957 .driver_info = IGNORE_DEVICE,
1958 },
1959
1960 /* Exclude Heimann Sensor GmbH USB appset demo */
1961 { USB_DEVICE(0x32a7, 0x0000),
1962 .driver_info = IGNORE_DEVICE,
1963 },
1964
1965 /* control interfaces without any protocol set */
1966 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1967 USB_CDC_PROTO_NONE) },
1968
1969 /* control interfaces with various AT-command sets */
1970 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1971 USB_CDC_ACM_PROTO_AT_V25TER) },
1972 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1973 USB_CDC_ACM_PROTO_AT_PCCA101) },
1974 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1975 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1976 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1977 USB_CDC_ACM_PROTO_AT_GSM) },
1978 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1979 USB_CDC_ACM_PROTO_AT_3G) },
1980 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1981 USB_CDC_ACM_PROTO_AT_CDMA) },
1982
1983 { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1984 .driver_info = SEND_ZERO_PACKET,
1985 },
1986
1987 { }
1988};
1989
1990MODULE_DEVICE_TABLE(usb, acm_ids);
1991
1992static struct usb_driver acm_driver = {
1993 .name = "cdc_acm",
1994 .probe = acm_probe,
1995 .disconnect = acm_disconnect,
1996#ifdef CONFIG_PM
1997 .suspend = acm_suspend,
1998 .resume = acm_resume,
1999 .reset_resume = acm_reset_resume,
2000#endif
2001 .pre_reset = acm_pre_reset,
2002 .id_table = acm_ids,
2003#ifdef CONFIG_PM
2004 .supports_autosuspend = 1,
2005#endif
2006 .disable_hub_initiated_lpm = 1,
2007};
2008
2009/*
2010 * TTY driver structures.
2011 */
2012
2013static const struct tty_operations acm_ops = {
2014 .install = acm_tty_install,
2015 .open = acm_tty_open,
2016 .close = acm_tty_close,
2017 .cleanup = acm_tty_cleanup,
2018 .hangup = acm_tty_hangup,
2019 .write = acm_tty_write,
2020 .write_room = acm_tty_write_room,
2021 .ioctl = acm_tty_ioctl,
2022 .throttle = acm_tty_throttle,
2023 .unthrottle = acm_tty_unthrottle,
2024 .chars_in_buffer = acm_tty_chars_in_buffer,
2025 .break_ctl = acm_tty_break_ctl,
2026 .set_termios = acm_tty_set_termios,
2027 .tiocmget = acm_tty_tiocmget,
2028 .tiocmset = acm_tty_tiocmset,
2029 .get_serial = get_serial_info,
2030 .set_serial = set_serial_info,
2031 .get_icount = acm_tty_get_icount,
2032};
2033
2034/*
2035 * Init / exit.
2036 */
2037
2038static int __init acm_init(void)
2039{
2040 int retval;
2041 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
2042 if (!acm_tty_driver)
2043 return -ENOMEM;
2044 acm_tty_driver->driver_name = "acm",
2045 acm_tty_driver->name = "ttyACM",
2046 acm_tty_driver->major = ACM_TTY_MAJOR,
2047 acm_tty_driver->minor_start = 0,
2048 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2049 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2050 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2051 acm_tty_driver->init_termios = tty_std_termios;
2052 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2053 HUPCL | CLOCAL;
2054 tty_set_operations(acm_tty_driver, &acm_ops);
2055
2056 retval = tty_register_driver(acm_tty_driver);
2057 if (retval) {
2058 put_tty_driver(acm_tty_driver);
2059 return retval;
2060 }
2061
2062 retval = usb_register(&acm_driver);
2063 if (retval) {
2064 tty_unregister_driver(acm_tty_driver);
2065 put_tty_driver(acm_tty_driver);
2066 return retval;
2067 }
2068
2069 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2070
2071 return 0;
2072}
2073
2074static void __exit acm_exit(void)
2075{
2076 usb_deregister(&acm_driver);
2077 tty_unregister_driver(acm_tty_driver);
2078 put_tty_driver(acm_tty_driver);
2079 idr_destroy(&acm_minors);
2080}
2081
2082module_init(acm_init);
2083module_exit(acm_exit);
2084
2085MODULE_AUTHOR(DRIVER_AUTHOR);
2086MODULE_DESCRIPTION(DRIVER_DESC);
2087MODULE_LICENSE("GPL");
2088MODULE_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/module.h>
43#include <linux/mutex.h>
44#include <linux/uaccess.h>
45#include <linux/usb.h>
46#include <linux/usb/cdc.h>
47#include <asm/byteorder.h>
48#include <asm/unaligned.h>
49#include <linux/idr.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;
60
61static DEFINE_IDR(acm_minors);
62static DEFINE_MUTEX(acm_minors_lock);
63
64static void acm_tty_set_termios(struct tty_struct *tty,
65 struct ktermios *termios_old);
66
67/*
68 * acm_minors accessors
69 */
70
71/*
72 * Look up an ACM structure by minor. If found and not disconnected, increment
73 * its refcount and return it with its mutex held.
74 */
75static struct acm *acm_get_by_minor(unsigned int minor)
76{
77 struct acm *acm;
78
79 mutex_lock(&acm_minors_lock);
80 acm = idr_find(&acm_minors, minor);
81 if (acm) {
82 mutex_lock(&acm->mutex);
83 if (acm->disconnected) {
84 mutex_unlock(&acm->mutex);
85 acm = NULL;
86 } else {
87 tty_port_get(&acm->port);
88 mutex_unlock(&acm->mutex);
89 }
90 }
91 mutex_unlock(&acm_minors_lock);
92 return acm;
93}
94
95/*
96 * Try to find an available minor number and if found, associate it with 'acm'.
97 */
98static int acm_alloc_minor(struct acm *acm)
99{
100 int minor;
101
102 mutex_lock(&acm_minors_lock);
103 minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
104 mutex_unlock(&acm_minors_lock);
105
106 return minor;
107}
108
109/* Release the minor number associated with 'acm'. */
110static void acm_release_minor(struct acm *acm)
111{
112 mutex_lock(&acm_minors_lock);
113 idr_remove(&acm_minors, acm->minor);
114 mutex_unlock(&acm_minors_lock);
115}
116
117/*
118 * Functions for ACM control messages.
119 */
120
121static int acm_ctrl_msg(struct acm *acm, int request, int value,
122 void *buf, int len)
123{
124 int retval;
125
126 retval = usb_autopm_get_interface(acm->control);
127 if (retval)
128 return retval;
129
130 retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
131 request, USB_RT_ACM, value,
132 acm->control->altsetting[0].desc.bInterfaceNumber,
133 buf, len, 5000);
134
135 dev_dbg(&acm->control->dev,
136 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
137 __func__, request, value, len, retval);
138
139 usb_autopm_put_interface(acm->control);
140
141 return retval < 0 ? retval : 0;
142}
143
144/* devices aren't required to support these requests.
145 * the cdc acm descriptor tells whether they do...
146 */
147static inline int acm_set_control(struct acm *acm, int control)
148{
149 if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
150 return -EOPNOTSUPP;
151
152 return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
153 control, NULL, 0);
154}
155
156#define acm_set_line(acm, line) \
157 acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
158#define acm_send_break(acm, ms) \
159 acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
160
161static void acm_kill_urbs(struct acm *acm)
162{
163 int i;
164
165 usb_kill_urb(acm->ctrlurb);
166 for (i = 0; i < ACM_NW; i++)
167 usb_kill_urb(acm->wb[i].urb);
168 for (i = 0; i < acm->rx_buflimit; i++)
169 usb_kill_urb(acm->read_urbs[i]);
170}
171
172/*
173 * Write buffer management.
174 * All of these assume proper locks taken by the caller.
175 */
176
177static int acm_wb_alloc(struct acm *acm)
178{
179 int i, wbn;
180 struct acm_wb *wb;
181
182 wbn = 0;
183 i = 0;
184 for (;;) {
185 wb = &acm->wb[wbn];
186 if (!wb->use) {
187 wb->use = 1;
188 return wbn;
189 }
190 wbn = (wbn + 1) % ACM_NW;
191 if (++i >= ACM_NW)
192 return -1;
193 }
194}
195
196static int acm_wb_is_avail(struct acm *acm)
197{
198 int i, n;
199 unsigned long flags;
200
201 n = ACM_NW;
202 spin_lock_irqsave(&acm->write_lock, flags);
203 for (i = 0; i < ACM_NW; i++)
204 n -= acm->wb[i].use;
205 spin_unlock_irqrestore(&acm->write_lock, flags);
206 return n;
207}
208
209/*
210 * Finish write. Caller must hold acm->write_lock
211 */
212static void acm_write_done(struct acm *acm, struct acm_wb *wb)
213{
214 wb->use = 0;
215 acm->transmitting--;
216 usb_autopm_put_interface_async(acm->control);
217}
218
219/*
220 * Poke write.
221 *
222 * the caller is responsible for locking
223 */
224
225static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
226{
227 int rc;
228
229 acm->transmitting++;
230
231 wb->urb->transfer_buffer = wb->buf;
232 wb->urb->transfer_dma = wb->dmah;
233 wb->urb->transfer_buffer_length = wb->len;
234 wb->urb->dev = acm->dev;
235
236 rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
237 if (rc < 0) {
238 dev_err(&acm->data->dev,
239 "%s - usb_submit_urb(write bulk) failed: %d\n",
240 __func__, rc);
241 acm_write_done(acm, wb);
242 }
243 return rc;
244}
245
246/*
247 * attributes exported through sysfs
248 */
249static ssize_t show_caps
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 return sprintf(buf, "%d", acm->ctrl_caps);
256}
257static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
258
259static ssize_t show_country_codes
260(struct device *dev, struct device_attribute *attr, char *buf)
261{
262 struct usb_interface *intf = to_usb_interface(dev);
263 struct acm *acm = usb_get_intfdata(intf);
264
265 memcpy(buf, acm->country_codes, acm->country_code_size);
266 return acm->country_code_size;
267}
268
269static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
270
271static ssize_t show_country_rel_date
272(struct device *dev, struct device_attribute *attr, char *buf)
273{
274 struct usb_interface *intf = to_usb_interface(dev);
275 struct acm *acm = usb_get_intfdata(intf);
276
277 return sprintf(buf, "%d", acm->country_rel_date);
278}
279
280static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
281/*
282 * Interrupt handlers for various ACM device responses
283 */
284
285/* control interface reports status changes with "interrupt" transfers */
286static void acm_ctrl_irq(struct urb *urb)
287{
288 struct acm *acm = urb->context;
289 struct usb_cdc_notification *dr = urb->transfer_buffer;
290 unsigned char *data;
291 int newctrl;
292 int difference;
293 int retval;
294 int status = urb->status;
295
296 switch (status) {
297 case 0:
298 /* success */
299 break;
300 case -ECONNRESET:
301 case -ENOENT:
302 case -ESHUTDOWN:
303 /* this urb is terminated, clean up */
304 dev_dbg(&acm->control->dev,
305 "%s - urb shutting down with status: %d\n",
306 __func__, status);
307 return;
308 default:
309 dev_dbg(&acm->control->dev,
310 "%s - nonzero urb status received: %d\n",
311 __func__, status);
312 goto exit;
313 }
314
315 usb_mark_last_busy(acm->dev);
316
317 data = (unsigned char *)(dr + 1);
318 switch (dr->bNotificationType) {
319 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
320 dev_dbg(&acm->control->dev,
321 "%s - network connection: %d\n", __func__, dr->wValue);
322 break;
323
324 case USB_CDC_NOTIFY_SERIAL_STATE:
325 newctrl = get_unaligned_le16(data);
326
327 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
328 dev_dbg(&acm->control->dev,
329 "%s - calling hangup\n", __func__);
330 tty_port_tty_hangup(&acm->port, false);
331 }
332
333 difference = acm->ctrlin ^ newctrl;
334 spin_lock(&acm->read_lock);
335 acm->ctrlin = newctrl;
336 acm->oldcount = acm->iocount;
337
338 if (difference & ACM_CTRL_DSR)
339 acm->iocount.dsr++;
340 if (difference & ACM_CTRL_BRK)
341 acm->iocount.brk++;
342 if (difference & ACM_CTRL_RI)
343 acm->iocount.rng++;
344 if (difference & ACM_CTRL_DCD)
345 acm->iocount.dcd++;
346 if (difference & ACM_CTRL_FRAMING)
347 acm->iocount.frame++;
348 if (difference & ACM_CTRL_PARITY)
349 acm->iocount.parity++;
350 if (difference & ACM_CTRL_OVERRUN)
351 acm->iocount.overrun++;
352 spin_unlock(&acm->read_lock);
353
354 if (difference)
355 wake_up_all(&acm->wioctl);
356
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 && retval != -EPERM)
371 dev_err(&acm->control->dev,
372 "%s - usb_submit_urb failed: %d\n", __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 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
383 if (res) {
384 if (res != -EPERM) {
385 dev_err(&acm->data->dev,
386 "urb %d failed submission with %d\n",
387 index, res);
388 }
389 set_bit(index, &acm->read_urbs_free);
390 return res;
391 } else {
392 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
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 if (!urb->actual_length)
415 return;
416
417 tty_insert_flip_string(&acm->port, urb->transfer_buffer,
418 urb->actual_length);
419 tty_flip_buffer_push(&acm->port);
420}
421
422static void acm_read_bulk_callback(struct urb *urb)
423{
424 struct acm_rb *rb = urb->context;
425 struct acm *acm = rb->instance;
426 unsigned long flags;
427 int status = urb->status;
428
429 dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
430 rb->index, urb->actual_length, status);
431
432 set_bit(rb->index, &acm->read_urbs_free);
433
434 if (!acm->dev) {
435 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
436 return;
437 }
438
439 switch (status) {
440 case 0:
441 usb_mark_last_busy(acm->dev);
442 acm_process_read_urb(acm, urb);
443 break;
444 case -EPIPE:
445 set_bit(EVENT_RX_STALL, &acm->flags);
446 schedule_work(&acm->work);
447 return;
448 case -ENOENT:
449 case -ECONNRESET:
450 case -ESHUTDOWN:
451 dev_dbg(&acm->data->dev,
452 "%s - urb shutting down with status: %d\n",
453 __func__, status);
454 return;
455 default:
456 dev_dbg(&acm->data->dev,
457 "%s - nonzero urb status received: %d\n",
458 __func__, status);
459 break;
460 }
461
462 /*
463 * Unthrottle may run on another CPU which needs to see events
464 * in the same order. Submission has an implict barrier
465 */
466 smp_mb__before_atomic();
467
468 /* throttle device if requested by tty */
469 spin_lock_irqsave(&acm->read_lock, flags);
470 acm->throttled = acm->throttle_req;
471 if (!acm->throttled) {
472 spin_unlock_irqrestore(&acm->read_lock, flags);
473 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
474 } else {
475 spin_unlock_irqrestore(&acm->read_lock, flags);
476 }
477}
478
479/* data interface wrote those outgoing bytes */
480static void acm_write_bulk(struct urb *urb)
481{
482 struct acm_wb *wb = urb->context;
483 struct acm *acm = wb->instance;
484 unsigned long flags;
485 int status = urb->status;
486
487 if (status || (urb->actual_length != urb->transfer_buffer_length))
488 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
489 urb->actual_length,
490 urb->transfer_buffer_length,
491 status);
492
493 spin_lock_irqsave(&acm->write_lock, flags);
494 acm_write_done(acm, wb);
495 spin_unlock_irqrestore(&acm->write_lock, flags);
496 set_bit(EVENT_TTY_WAKEUP, &acm->flags);
497 schedule_work(&acm->work);
498}
499
500static void acm_softint(struct work_struct *work)
501{
502 int i;
503 struct acm *acm = container_of(work, struct acm, work);
504
505 if (test_bit(EVENT_RX_STALL, &acm->flags)) {
506 if (!(usb_autopm_get_interface(acm->data))) {
507 for (i = 0; i < acm->rx_buflimit; i++)
508 usb_kill_urb(acm->read_urbs[i]);
509 usb_clear_halt(acm->dev, acm->in);
510 acm_submit_read_urbs(acm, GFP_KERNEL);
511 usb_autopm_put_interface(acm->data);
512 }
513 clear_bit(EVENT_RX_STALL, &acm->flags);
514 }
515
516 if (test_bit(EVENT_TTY_WAKEUP, &acm->flags)) {
517 tty_port_tty_wakeup(&acm->port);
518 clear_bit(EVENT_TTY_WAKEUP, &acm->flags);
519 }
520}
521
522/*
523 * TTY handlers
524 */
525
526static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
527{
528 struct acm *acm;
529 int retval;
530
531 acm = acm_get_by_minor(tty->index);
532 if (!acm)
533 return -ENODEV;
534
535 retval = tty_standard_install(driver, tty);
536 if (retval)
537 goto error_init_termios;
538
539 tty->driver_data = acm;
540
541 return 0;
542
543error_init_termios:
544 tty_port_put(&acm->port);
545 return retval;
546}
547
548static int acm_tty_open(struct tty_struct *tty, struct file *filp)
549{
550 struct acm *acm = tty->driver_data;
551
552 return tty_port_open(&acm->port, tty, filp);
553}
554
555static void acm_port_dtr_rts(struct tty_port *port, int raise)
556{
557 struct acm *acm = container_of(port, struct acm, port);
558 int val;
559 int res;
560
561 if (raise)
562 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
563 else
564 val = 0;
565
566 /* FIXME: add missing ctrlout locking throughout driver */
567 acm->ctrlout = val;
568
569 res = acm_set_control(acm, val);
570 if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
571 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
572}
573
574static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
575{
576 struct acm *acm = container_of(port, struct acm, port);
577 int retval = -ENODEV;
578 int i;
579
580 mutex_lock(&acm->mutex);
581 if (acm->disconnected)
582 goto disconnected;
583
584 retval = usb_autopm_get_interface(acm->control);
585 if (retval)
586 goto error_get_interface;
587
588 /*
589 * FIXME: Why do we need this? Allocating 64K of physically contiguous
590 * memory is really nasty...
591 */
592 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
593 acm->control->needs_remote_wakeup = 1;
594
595 acm->ctrlurb->dev = acm->dev;
596 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
597 if (retval) {
598 dev_err(&acm->control->dev,
599 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
600 goto error_submit_urb;
601 }
602
603 acm_tty_set_termios(tty, NULL);
604
605 /*
606 * Unthrottle device in case the TTY was closed while throttled.
607 */
608 spin_lock_irq(&acm->read_lock);
609 acm->throttled = 0;
610 acm->throttle_req = 0;
611 spin_unlock_irq(&acm->read_lock);
612
613 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
614 if (retval)
615 goto error_submit_read_urbs;
616
617 usb_autopm_put_interface(acm->control);
618
619 mutex_unlock(&acm->mutex);
620
621 return 0;
622
623error_submit_read_urbs:
624 for (i = 0; i < acm->rx_buflimit; i++)
625 usb_kill_urb(acm->read_urbs[i]);
626 usb_kill_urb(acm->ctrlurb);
627error_submit_urb:
628 usb_autopm_put_interface(acm->control);
629error_get_interface:
630disconnected:
631 mutex_unlock(&acm->mutex);
632
633 return usb_translate_errors(retval);
634}
635
636static void acm_port_destruct(struct tty_port *port)
637{
638 struct acm *acm = container_of(port, struct acm, port);
639
640 acm_release_minor(acm);
641 usb_put_intf(acm->control);
642 kfree(acm->country_codes);
643 kfree(acm);
644}
645
646static void acm_port_shutdown(struct tty_port *port)
647{
648 struct acm *acm = container_of(port, struct acm, port);
649 struct urb *urb;
650 struct acm_wb *wb;
651
652 /*
653 * Need to grab write_lock to prevent race with resume, but no need to
654 * hold it due to the tty-port initialised flag.
655 */
656 spin_lock_irq(&acm->write_lock);
657 spin_unlock_irq(&acm->write_lock);
658
659 usb_autopm_get_interface_no_resume(acm->control);
660 acm->control->needs_remote_wakeup = 0;
661 usb_autopm_put_interface(acm->control);
662
663 for (;;) {
664 urb = usb_get_from_anchor(&acm->delayed);
665 if (!urb)
666 break;
667 wb = urb->context;
668 wb->use = 0;
669 usb_autopm_put_interface_async(acm->control);
670 }
671
672 acm_kill_urbs(acm);
673}
674
675static void acm_tty_cleanup(struct tty_struct *tty)
676{
677 struct acm *acm = tty->driver_data;
678
679 tty_port_put(&acm->port);
680}
681
682static void acm_tty_hangup(struct tty_struct *tty)
683{
684 struct acm *acm = tty->driver_data;
685
686 tty_port_hangup(&acm->port);
687}
688
689static void acm_tty_close(struct tty_struct *tty, struct file *filp)
690{
691 struct acm *acm = tty->driver_data;
692
693 tty_port_close(&acm->port, tty, filp);
694}
695
696static int acm_tty_write(struct tty_struct *tty,
697 const unsigned char *buf, int count)
698{
699 struct acm *acm = tty->driver_data;
700 int stat;
701 unsigned long flags;
702 int wbn;
703 struct acm_wb *wb;
704
705 if (!count)
706 return 0;
707
708 dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
709
710 spin_lock_irqsave(&acm->write_lock, flags);
711 wbn = acm_wb_alloc(acm);
712 if (wbn < 0) {
713 spin_unlock_irqrestore(&acm->write_lock, flags);
714 return 0;
715 }
716 wb = &acm->wb[wbn];
717
718 if (!acm->dev) {
719 wb->use = 0;
720 spin_unlock_irqrestore(&acm->write_lock, flags);
721 return -ENODEV;
722 }
723
724 count = (count > acm->writesize) ? acm->writesize : count;
725 dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
726 memcpy(wb->buf, buf, count);
727 wb->len = count;
728
729 stat = usb_autopm_get_interface_async(acm->control);
730 if (stat) {
731 wb->use = 0;
732 spin_unlock_irqrestore(&acm->write_lock, flags);
733 return stat;
734 }
735
736 if (acm->susp_count) {
737 if (acm->putbuffer) {
738 /* now to preserve order */
739 usb_anchor_urb(acm->putbuffer->urb, &acm->delayed);
740 acm->putbuffer = NULL;
741 }
742 usb_anchor_urb(wb->urb, &acm->delayed);
743 spin_unlock_irqrestore(&acm->write_lock, flags);
744 return count;
745 } else {
746 if (acm->putbuffer) {
747 /* at this point there is no good way to handle errors */
748 acm_start_wb(acm, acm->putbuffer);
749 acm->putbuffer = NULL;
750 }
751 }
752
753 stat = acm_start_wb(acm, wb);
754 spin_unlock_irqrestore(&acm->write_lock, flags);
755
756 if (stat < 0)
757 return stat;
758 return count;
759}
760
761static void acm_tty_flush_chars(struct tty_struct *tty)
762{
763 struct acm *acm = tty->driver_data;
764 struct acm_wb *cur = acm->putbuffer;
765 int err;
766 unsigned long flags;
767
768 if (!cur) /* nothing to do */
769 return;
770
771 acm->putbuffer = NULL;
772 err = usb_autopm_get_interface_async(acm->control);
773 spin_lock_irqsave(&acm->write_lock, flags);
774 if (err < 0) {
775 cur->use = 0;
776 acm->putbuffer = cur;
777 goto out;
778 }
779
780 if (acm->susp_count)
781 usb_anchor_urb(cur->urb, &acm->delayed);
782 else
783 acm_start_wb(acm, cur);
784out:
785 spin_unlock_irqrestore(&acm->write_lock, flags);
786 return;
787}
788
789static int acm_tty_put_char(struct tty_struct *tty, unsigned char ch)
790{
791 struct acm *acm = tty->driver_data;
792 struct acm_wb *cur;
793 int wbn;
794 unsigned long flags;
795
796overflow:
797 cur = acm->putbuffer;
798 if (!cur) {
799 spin_lock_irqsave(&acm->write_lock, flags);
800 wbn = acm_wb_alloc(acm);
801 if (wbn >= 0) {
802 cur = &acm->wb[wbn];
803 acm->putbuffer = cur;
804 }
805 spin_unlock_irqrestore(&acm->write_lock, flags);
806 if (!cur)
807 return 0;
808 }
809
810 if (cur->len == acm->writesize) {
811 acm_tty_flush_chars(tty);
812 goto overflow;
813 }
814
815 cur->buf[cur->len++] = ch;
816 return 1;
817}
818
819static int acm_tty_write_room(struct tty_struct *tty)
820{
821 struct acm *acm = tty->driver_data;
822 /*
823 * Do not let the line discipline to know that we have a reserve,
824 * or it might get too enthusiastic.
825 */
826 return acm_wb_is_avail(acm) ? acm->writesize : 0;
827}
828
829static int acm_tty_chars_in_buffer(struct tty_struct *tty)
830{
831 struct acm *acm = tty->driver_data;
832 /*
833 * if the device was unplugged then any remaining characters fell out
834 * of the connector ;)
835 */
836 if (acm->disconnected)
837 return 0;
838 /*
839 * This is inaccurate (overcounts), but it works.
840 */
841 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
842}
843
844static void acm_tty_throttle(struct tty_struct *tty)
845{
846 struct acm *acm = tty->driver_data;
847
848 spin_lock_irq(&acm->read_lock);
849 acm->throttle_req = 1;
850 spin_unlock_irq(&acm->read_lock);
851}
852
853static void acm_tty_unthrottle(struct tty_struct *tty)
854{
855 struct acm *acm = tty->driver_data;
856 unsigned int was_throttled;
857
858 spin_lock_irq(&acm->read_lock);
859 was_throttled = acm->throttled;
860 acm->throttled = 0;
861 acm->throttle_req = 0;
862 spin_unlock_irq(&acm->read_lock);
863
864 if (was_throttled)
865 acm_submit_read_urbs(acm, GFP_KERNEL);
866}
867
868static int acm_tty_break_ctl(struct tty_struct *tty, int state)
869{
870 struct acm *acm = tty->driver_data;
871 int retval;
872
873 retval = acm_send_break(acm, state ? 0xffff : 0);
874 if (retval < 0)
875 dev_dbg(&acm->control->dev,
876 "%s - send break failed\n", __func__);
877 return retval;
878}
879
880static int acm_tty_tiocmget(struct tty_struct *tty)
881{
882 struct acm *acm = tty->driver_data;
883
884 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
885 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
886 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
887 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
888 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
889 TIOCM_CTS;
890}
891
892static int acm_tty_tiocmset(struct tty_struct *tty,
893 unsigned int set, unsigned int clear)
894{
895 struct acm *acm = tty->driver_data;
896 unsigned int newctrl;
897
898 newctrl = acm->ctrlout;
899 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
900 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
901 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
902 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
903
904 newctrl = (newctrl & ~clear) | set;
905
906 if (acm->ctrlout == newctrl)
907 return 0;
908 return acm_set_control(acm, acm->ctrlout = newctrl);
909}
910
911static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
912{
913 struct serial_struct tmp;
914
915 memset(&tmp, 0, sizeof(tmp));
916 tmp.flags = ASYNC_LOW_LATENCY;
917 tmp.xmit_fifo_size = acm->writesize;
918 tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
919 tmp.close_delay = acm->port.close_delay / 10;
920 tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
921 ASYNC_CLOSING_WAIT_NONE :
922 acm->port.closing_wait / 10;
923
924 if (copy_to_user(info, &tmp, sizeof(tmp)))
925 return -EFAULT;
926 else
927 return 0;
928}
929
930static int set_serial_info(struct acm *acm,
931 struct serial_struct __user *newinfo)
932{
933 struct serial_struct new_serial;
934 unsigned int closing_wait, close_delay;
935 int retval = 0;
936
937 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
938 return -EFAULT;
939
940 close_delay = new_serial.close_delay * 10;
941 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
942 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
943
944 mutex_lock(&acm->port.mutex);
945
946 if (!capable(CAP_SYS_ADMIN)) {
947 if ((close_delay != acm->port.close_delay) ||
948 (closing_wait != acm->port.closing_wait))
949 retval = -EPERM;
950 else
951 retval = -EOPNOTSUPP;
952 } else {
953 acm->port.close_delay = close_delay;
954 acm->port.closing_wait = closing_wait;
955 }
956
957 mutex_unlock(&acm->port.mutex);
958 return retval;
959}
960
961static int wait_serial_change(struct acm *acm, unsigned long arg)
962{
963 int rv = 0;
964 DECLARE_WAITQUEUE(wait, current);
965 struct async_icount old, new;
966
967 do {
968 spin_lock_irq(&acm->read_lock);
969 old = acm->oldcount;
970 new = acm->iocount;
971 acm->oldcount = new;
972 spin_unlock_irq(&acm->read_lock);
973
974 if ((arg & TIOCM_DSR) &&
975 old.dsr != new.dsr)
976 break;
977 if ((arg & TIOCM_CD) &&
978 old.dcd != new.dcd)
979 break;
980 if ((arg & TIOCM_RI) &&
981 old.rng != new.rng)
982 break;
983
984 add_wait_queue(&acm->wioctl, &wait);
985 set_current_state(TASK_INTERRUPTIBLE);
986 schedule();
987 remove_wait_queue(&acm->wioctl, &wait);
988 if (acm->disconnected) {
989 if (arg & TIOCM_CD)
990 break;
991 else
992 rv = -ENODEV;
993 } else {
994 if (signal_pending(current))
995 rv = -ERESTARTSYS;
996 }
997 } while (!rv);
998
999
1000
1001 return rv;
1002}
1003
1004static int acm_tty_get_icount(struct tty_struct *tty,
1005 struct serial_icounter_struct *icount)
1006{
1007 struct acm *acm = tty->driver_data;
1008
1009 icount->dsr = acm->iocount.dsr;
1010 icount->rng = acm->iocount.rng;
1011 icount->dcd = acm->iocount.dcd;
1012 icount->frame = acm->iocount.frame;
1013 icount->overrun = acm->iocount.overrun;
1014 icount->parity = acm->iocount.parity;
1015 icount->brk = acm->iocount.brk;
1016
1017 return 0;
1018}
1019
1020static int acm_tty_ioctl(struct tty_struct *tty,
1021 unsigned int cmd, unsigned long arg)
1022{
1023 struct acm *acm = tty->driver_data;
1024 int rv = -ENOIOCTLCMD;
1025
1026 switch (cmd) {
1027 case TIOCGSERIAL: /* gets serial port data */
1028 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
1029 break;
1030 case TIOCSSERIAL:
1031 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
1032 break;
1033 case TIOCMIWAIT:
1034 rv = usb_autopm_get_interface(acm->control);
1035 if (rv < 0) {
1036 rv = -EIO;
1037 break;
1038 }
1039 rv = wait_serial_change(acm, arg);
1040 usb_autopm_put_interface(acm->control);
1041 break;
1042 }
1043
1044 return rv;
1045}
1046
1047static void acm_tty_set_termios(struct tty_struct *tty,
1048 struct ktermios *termios_old)
1049{
1050 struct acm *acm = tty->driver_data;
1051 struct ktermios *termios = &tty->termios;
1052 struct usb_cdc_line_coding newline;
1053 int newctrl = acm->ctrlout;
1054
1055 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1056 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1057 newline.bParityType = termios->c_cflag & PARENB ?
1058 (termios->c_cflag & PARODD ? 1 : 2) +
1059 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1060 switch (termios->c_cflag & CSIZE) {
1061 case CS5:
1062 newline.bDataBits = 5;
1063 break;
1064 case CS6:
1065 newline.bDataBits = 6;
1066 break;
1067 case CS7:
1068 newline.bDataBits = 7;
1069 break;
1070 case CS8:
1071 default:
1072 newline.bDataBits = 8;
1073 break;
1074 }
1075 /* FIXME: Needs to clear unsupported bits in the termios */
1076 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1077
1078 if (C_BAUD(tty) == B0) {
1079 newline.dwDTERate = acm->line.dwDTERate;
1080 newctrl &= ~ACM_CTRL_DTR;
1081 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1082 newctrl |= ACM_CTRL_DTR;
1083 }
1084
1085 if (newctrl != acm->ctrlout)
1086 acm_set_control(acm, acm->ctrlout = newctrl);
1087
1088 if (memcmp(&acm->line, &newline, sizeof newline)) {
1089 memcpy(&acm->line, &newline, sizeof newline);
1090 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1091 __func__,
1092 le32_to_cpu(newline.dwDTERate),
1093 newline.bCharFormat, newline.bParityType,
1094 newline.bDataBits);
1095 acm_set_line(acm, &acm->line);
1096 }
1097}
1098
1099static const struct tty_port_operations acm_port_ops = {
1100 .dtr_rts = acm_port_dtr_rts,
1101 .shutdown = acm_port_shutdown,
1102 .activate = acm_port_activate,
1103 .destruct = acm_port_destruct,
1104};
1105
1106/*
1107 * USB probe and disconnect routines.
1108 */
1109
1110/* Little helpers: write/read buffers free */
1111static void acm_write_buffers_free(struct acm *acm)
1112{
1113 int i;
1114 struct acm_wb *wb;
1115
1116 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1117 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1118}
1119
1120static void acm_read_buffers_free(struct acm *acm)
1121{
1122 int i;
1123
1124 for (i = 0; i < acm->rx_buflimit; i++)
1125 usb_free_coherent(acm->dev, acm->readsize,
1126 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1127}
1128
1129/* Little helper: write buffers allocate */
1130static int acm_write_buffers_alloc(struct acm *acm)
1131{
1132 int i;
1133 struct acm_wb *wb;
1134
1135 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1136 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1137 &wb->dmah);
1138 if (!wb->buf) {
1139 while (i != 0) {
1140 --i;
1141 --wb;
1142 usb_free_coherent(acm->dev, acm->writesize,
1143 wb->buf, wb->dmah);
1144 }
1145 return -ENOMEM;
1146 }
1147 }
1148 return 0;
1149}
1150
1151static int acm_probe(struct usb_interface *intf,
1152 const struct usb_device_id *id)
1153{
1154 struct usb_cdc_union_desc *union_header = NULL;
1155 struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1156 unsigned char *buffer = intf->altsetting->extra;
1157 int buflen = intf->altsetting->extralen;
1158 struct usb_interface *control_interface;
1159 struct usb_interface *data_interface;
1160 struct usb_endpoint_descriptor *epctrl = NULL;
1161 struct usb_endpoint_descriptor *epread = NULL;
1162 struct usb_endpoint_descriptor *epwrite = NULL;
1163 struct usb_device *usb_dev = interface_to_usbdev(intf);
1164 struct usb_cdc_parsed_header h;
1165 struct acm *acm;
1166 int minor;
1167 int ctrlsize, readsize;
1168 u8 *buf;
1169 int call_intf_num = -1;
1170 int data_intf_num = -1;
1171 unsigned long quirks;
1172 int num_rx_buf;
1173 int i;
1174 int combined_interfaces = 0;
1175 struct device *tty_dev;
1176 int rv = -ENOMEM;
1177
1178 /* normal quirks */
1179 quirks = (unsigned long)id->driver_info;
1180
1181 if (quirks == IGNORE_DEVICE)
1182 return -ENODEV;
1183
1184 memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1185
1186 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1187
1188 /* handle quirks deadly to normal probing*/
1189 if (quirks == NO_UNION_NORMAL) {
1190 data_interface = usb_ifnum_to_if(usb_dev, 1);
1191 control_interface = usb_ifnum_to_if(usb_dev, 0);
1192 /* we would crash */
1193 if (!data_interface || !control_interface)
1194 return -ENODEV;
1195 goto skip_normal_probe;
1196 }
1197
1198 /* normal probing*/
1199 if (!buffer) {
1200 dev_err(&intf->dev, "Weird descriptor references\n");
1201 return -EINVAL;
1202 }
1203
1204 if (!intf->cur_altsetting)
1205 return -EINVAL;
1206
1207 if (!buflen) {
1208 if (intf->cur_altsetting->endpoint &&
1209 intf->cur_altsetting->endpoint->extralen &&
1210 intf->cur_altsetting->endpoint->extra) {
1211 dev_dbg(&intf->dev,
1212 "Seeking extra descriptors on endpoint\n");
1213 buflen = intf->cur_altsetting->endpoint->extralen;
1214 buffer = intf->cur_altsetting->endpoint->extra;
1215 } else {
1216 dev_err(&intf->dev,
1217 "Zero length descriptor references\n");
1218 return -EINVAL;
1219 }
1220 }
1221
1222 cdc_parse_cdc_header(&h, intf, buffer, buflen);
1223 union_header = h.usb_cdc_union_desc;
1224 cmgmd = h.usb_cdc_call_mgmt_descriptor;
1225 if (cmgmd)
1226 call_intf_num = cmgmd->bDataInterface;
1227
1228 if (!union_header) {
1229 if (call_intf_num > 0) {
1230 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1231 /* quirks for Droids MuIn LCD */
1232 if (quirks & NO_DATA_INTERFACE) {
1233 data_interface = usb_ifnum_to_if(usb_dev, 0);
1234 } else {
1235 data_intf_num = call_intf_num;
1236 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1237 }
1238 control_interface = intf;
1239 } else {
1240 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1241 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1242 return -ENODEV;
1243 } else {
1244 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1245 combined_interfaces = 1;
1246 control_interface = data_interface = intf;
1247 goto look_for_collapsed_interface;
1248 }
1249 }
1250 } else {
1251 data_intf_num = union_header->bSlaveInterface0;
1252 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1253 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1254 }
1255
1256 if (!control_interface || !data_interface) {
1257 dev_dbg(&intf->dev, "no interfaces\n");
1258 return -ENODEV;
1259 }
1260 if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1261 return -ENODEV;
1262
1263 if (data_intf_num != call_intf_num)
1264 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1265
1266 if (control_interface == data_interface) {
1267 /* some broken devices designed for windows work this way */
1268 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1269 combined_interfaces = 1;
1270 /* a popular other OS doesn't use it */
1271 quirks |= NO_CAP_LINE;
1272 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1273 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1274 return -EINVAL;
1275 }
1276look_for_collapsed_interface:
1277 for (i = 0; i < 3; i++) {
1278 struct usb_endpoint_descriptor *ep;
1279 ep = &data_interface->cur_altsetting->endpoint[i].desc;
1280
1281 if (usb_endpoint_is_int_in(ep))
1282 epctrl = ep;
1283 else if (usb_endpoint_is_bulk_out(ep))
1284 epwrite = ep;
1285 else if (usb_endpoint_is_bulk_in(ep))
1286 epread = ep;
1287 else
1288 return -EINVAL;
1289 }
1290 if (!epctrl || !epread || !epwrite)
1291 return -ENODEV;
1292 else
1293 goto made_compressed_probe;
1294 }
1295
1296skip_normal_probe:
1297
1298 /*workaround for switched interfaces */
1299 if (data_interface->cur_altsetting->desc.bInterfaceClass
1300 != CDC_DATA_INTERFACE_TYPE) {
1301 if (control_interface->cur_altsetting->desc.bInterfaceClass
1302 == CDC_DATA_INTERFACE_TYPE) {
1303 dev_dbg(&intf->dev,
1304 "Your device has switched interfaces.\n");
1305 swap(control_interface, data_interface);
1306 } else {
1307 return -EINVAL;
1308 }
1309 }
1310
1311 /* Accept probe requests only for the control interface */
1312 if (!combined_interfaces && intf != control_interface)
1313 return -ENODEV;
1314
1315 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1316 /* valid in this context */
1317 dev_dbg(&intf->dev, "The data interface isn't available\n");
1318 return -EBUSY;
1319 }
1320
1321
1322 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1323 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1324 return -EINVAL;
1325
1326 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1327 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1328 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1329
1330
1331 /* workaround for switched endpoints */
1332 if (!usb_endpoint_dir_in(epread)) {
1333 /* descriptors are swapped */
1334 dev_dbg(&intf->dev,
1335 "The data interface has switched endpoints\n");
1336 swap(epread, epwrite);
1337 }
1338made_compressed_probe:
1339 dev_dbg(&intf->dev, "interfaces are valid\n");
1340
1341 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1342 if (acm == NULL)
1343 goto alloc_fail;
1344
1345 minor = acm_alloc_minor(acm);
1346 if (minor < 0)
1347 goto alloc_fail1;
1348
1349 ctrlsize = usb_endpoint_maxp(epctrl);
1350 readsize = usb_endpoint_maxp(epread) *
1351 (quirks == SINGLE_RX_URB ? 1 : 2);
1352 acm->combined_interfaces = combined_interfaces;
1353 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1354 acm->control = control_interface;
1355 acm->data = data_interface;
1356 acm->minor = minor;
1357 acm->dev = usb_dev;
1358 if (h.usb_cdc_acm_descriptor)
1359 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1360 if (quirks & NO_CAP_LINE)
1361 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1362 acm->ctrlsize = ctrlsize;
1363 acm->readsize = readsize;
1364 acm->rx_buflimit = num_rx_buf;
1365 INIT_WORK(&acm->work, acm_softint);
1366 init_waitqueue_head(&acm->wioctl);
1367 spin_lock_init(&acm->write_lock);
1368 spin_lock_init(&acm->read_lock);
1369 mutex_init(&acm->mutex);
1370 if (usb_endpoint_xfer_int(epread)) {
1371 acm->bInterval = epread->bInterval;
1372 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1373 } else {
1374 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1375 }
1376 if (usb_endpoint_xfer_int(epwrite))
1377 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1378 else
1379 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1380 tty_port_init(&acm->port);
1381 acm->port.ops = &acm_port_ops;
1382 init_usb_anchor(&acm->delayed);
1383 acm->quirks = quirks;
1384
1385 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1386 if (!buf)
1387 goto alloc_fail2;
1388 acm->ctrl_buffer = buf;
1389
1390 if (acm_write_buffers_alloc(acm) < 0)
1391 goto alloc_fail4;
1392
1393 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1394 if (!acm->ctrlurb)
1395 goto alloc_fail5;
1396
1397 for (i = 0; i < num_rx_buf; i++) {
1398 struct acm_rb *rb = &(acm->read_buffers[i]);
1399 struct urb *urb;
1400
1401 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1402 &rb->dma);
1403 if (!rb->base)
1404 goto alloc_fail6;
1405 rb->index = i;
1406 rb->instance = acm;
1407
1408 urb = usb_alloc_urb(0, GFP_KERNEL);
1409 if (!urb)
1410 goto alloc_fail6;
1411
1412 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1413 urb->transfer_dma = rb->dma;
1414 if (usb_endpoint_xfer_int(epread))
1415 usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1416 acm->readsize,
1417 acm_read_bulk_callback, rb,
1418 acm->bInterval);
1419 else
1420 usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1421 acm->readsize,
1422 acm_read_bulk_callback, rb);
1423
1424 acm->read_urbs[i] = urb;
1425 __set_bit(i, &acm->read_urbs_free);
1426 }
1427 for (i = 0; i < ACM_NW; i++) {
1428 struct acm_wb *snd = &(acm->wb[i]);
1429
1430 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1431 if (snd->urb == NULL)
1432 goto alloc_fail7;
1433
1434 if (usb_endpoint_xfer_int(epwrite))
1435 usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1436 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1437 else
1438 usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1439 NULL, acm->writesize, acm_write_bulk, snd);
1440 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1441 if (quirks & SEND_ZERO_PACKET)
1442 snd->urb->transfer_flags |= URB_ZERO_PACKET;
1443 snd->instance = acm;
1444 }
1445
1446 usb_set_intfdata(intf, acm);
1447
1448 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1449 if (i < 0)
1450 goto alloc_fail7;
1451
1452 if (h.usb_cdc_country_functional_desc) { /* export the country data */
1453 struct usb_cdc_country_functional_desc * cfd =
1454 h.usb_cdc_country_functional_desc;
1455
1456 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1457 if (!acm->country_codes)
1458 goto skip_countries;
1459 acm->country_code_size = cfd->bLength - 4;
1460 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1461 cfd->bLength - 4);
1462 acm->country_rel_date = cfd->iCountryCodeRelDate;
1463
1464 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1465 if (i < 0) {
1466 kfree(acm->country_codes);
1467 acm->country_codes = NULL;
1468 acm->country_code_size = 0;
1469 goto skip_countries;
1470 }
1471
1472 i = device_create_file(&intf->dev,
1473 &dev_attr_iCountryCodeRelDate);
1474 if (i < 0) {
1475 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1476 kfree(acm->country_codes);
1477 acm->country_codes = NULL;
1478 acm->country_code_size = 0;
1479 goto skip_countries;
1480 }
1481 }
1482
1483skip_countries:
1484 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1485 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1486 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1487 /* works around buggy devices */
1488 epctrl->bInterval ? epctrl->bInterval : 16);
1489 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1490 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1491
1492 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1493
1494 acm->line.dwDTERate = cpu_to_le32(9600);
1495 acm->line.bDataBits = 8;
1496 acm_set_line(acm, &acm->line);
1497
1498 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1499 usb_set_intfdata(data_interface, acm);
1500
1501 usb_get_intf(control_interface);
1502 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1503 &control_interface->dev);
1504 if (IS_ERR(tty_dev)) {
1505 rv = PTR_ERR(tty_dev);
1506 goto alloc_fail8;
1507 }
1508
1509 if (quirks & CLEAR_HALT_CONDITIONS) {
1510 usb_clear_halt(usb_dev, acm->in);
1511 usb_clear_halt(usb_dev, acm->out);
1512 }
1513
1514 return 0;
1515alloc_fail8:
1516 if (acm->country_codes) {
1517 device_remove_file(&acm->control->dev,
1518 &dev_attr_wCountryCodes);
1519 device_remove_file(&acm->control->dev,
1520 &dev_attr_iCountryCodeRelDate);
1521 kfree(acm->country_codes);
1522 }
1523 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1524alloc_fail7:
1525 usb_set_intfdata(intf, NULL);
1526 for (i = 0; i < ACM_NW; i++)
1527 usb_free_urb(acm->wb[i].urb);
1528alloc_fail6:
1529 for (i = 0; i < num_rx_buf; i++)
1530 usb_free_urb(acm->read_urbs[i]);
1531 acm_read_buffers_free(acm);
1532 usb_free_urb(acm->ctrlurb);
1533alloc_fail5:
1534 acm_write_buffers_free(acm);
1535alloc_fail4:
1536 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1537alloc_fail2:
1538 acm_release_minor(acm);
1539alloc_fail1:
1540 kfree(acm);
1541alloc_fail:
1542 return rv;
1543}
1544
1545static void acm_disconnect(struct usb_interface *intf)
1546{
1547 struct acm *acm = usb_get_intfdata(intf);
1548 struct tty_struct *tty;
1549
1550 /* sibling interface is already cleaning up */
1551 if (!acm)
1552 return;
1553
1554 mutex_lock(&acm->mutex);
1555 acm->disconnected = true;
1556 if (acm->country_codes) {
1557 device_remove_file(&acm->control->dev,
1558 &dev_attr_wCountryCodes);
1559 device_remove_file(&acm->control->dev,
1560 &dev_attr_iCountryCodeRelDate);
1561 }
1562 wake_up_all(&acm->wioctl);
1563 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1564 usb_set_intfdata(acm->control, NULL);
1565 usb_set_intfdata(acm->data, NULL);
1566 mutex_unlock(&acm->mutex);
1567
1568 tty = tty_port_tty_get(&acm->port);
1569 if (tty) {
1570 tty_vhangup(tty);
1571 tty_kref_put(tty);
1572 }
1573
1574 acm_kill_urbs(acm);
1575 cancel_work_sync(&acm->work);
1576
1577 tty_unregister_device(acm_tty_driver, acm->minor);
1578
1579 acm_write_buffers_free(acm);
1580 usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1581 acm_read_buffers_free(acm);
1582
1583 if (!acm->combined_interfaces)
1584 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1585 acm->data : acm->control);
1586
1587 tty_port_put(&acm->port);
1588}
1589
1590#ifdef CONFIG_PM
1591static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1592{
1593 struct acm *acm = usb_get_intfdata(intf);
1594 int cnt;
1595
1596 spin_lock_irq(&acm->write_lock);
1597 if (PMSG_IS_AUTO(message)) {
1598 if (acm->transmitting) {
1599 spin_unlock_irq(&acm->write_lock);
1600 return -EBUSY;
1601 }
1602 }
1603 cnt = acm->susp_count++;
1604 spin_unlock_irq(&acm->write_lock);
1605
1606 if (cnt)
1607 return 0;
1608
1609 acm_kill_urbs(acm);
1610 cancel_work_sync(&acm->work);
1611
1612 return 0;
1613}
1614
1615static int acm_resume(struct usb_interface *intf)
1616{
1617 struct acm *acm = usb_get_intfdata(intf);
1618 struct urb *urb;
1619 int rv = 0;
1620
1621 spin_lock_irq(&acm->write_lock);
1622
1623 if (--acm->susp_count)
1624 goto out;
1625
1626 if (tty_port_initialized(&acm->port)) {
1627 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1628
1629 for (;;) {
1630 urb = usb_get_from_anchor(&acm->delayed);
1631 if (!urb)
1632 break;
1633
1634 acm_start_wb(acm, urb->context);
1635 }
1636
1637 /*
1638 * delayed error checking because we must
1639 * do the write path at all cost
1640 */
1641 if (rv < 0)
1642 goto out;
1643
1644 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1645 }
1646out:
1647 spin_unlock_irq(&acm->write_lock);
1648
1649 return rv;
1650}
1651
1652static int acm_reset_resume(struct usb_interface *intf)
1653{
1654 struct acm *acm = usb_get_intfdata(intf);
1655
1656 if (tty_port_initialized(&acm->port))
1657 tty_port_tty_hangup(&acm->port, false);
1658
1659 return acm_resume(intf);
1660}
1661
1662#endif /* CONFIG_PM */
1663
1664static int acm_pre_reset(struct usb_interface *intf)
1665{
1666 struct acm *acm = usb_get_intfdata(intf);
1667
1668 clear_bit(EVENT_RX_STALL, &acm->flags);
1669
1670 return 0;
1671}
1672
1673#define NOKIA_PCSUITE_ACM_INFO(x) \
1674 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1675 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1676 USB_CDC_ACM_PROTO_VENDOR)
1677
1678#define SAMSUNG_PCSUITE_ACM_INFO(x) \
1679 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1680 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1681 USB_CDC_ACM_PROTO_VENDOR)
1682
1683/*
1684 * USB driver structure.
1685 */
1686
1687static const struct usb_device_id acm_ids[] = {
1688 /* quirky and broken devices */
1689 { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1690 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1691 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1692 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1693 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1694 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1695 },
1696 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1697 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1698 },
1699 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1700 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1701 },
1702 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1703 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1704 },
1705 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1706 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1707 },
1708 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1709 .driver_info = SINGLE_RX_URB,
1710 },
1711 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1712 .driver_info = SINGLE_RX_URB, /* firmware bug */
1713 },
1714 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1715 .driver_info = SINGLE_RX_URB, /* firmware bug */
1716 },
1717 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1718 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1719 },
1720 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1721 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1722 },
1723 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1724 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1725 },
1726 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1727 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1728 },
1729 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1730 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1731 },
1732 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1733 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1734 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1735 { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1736 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1737 },
1738 /* Motorola H24 HSPA module: */
1739 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1740 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1741 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1742 },
1743 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1744 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1745 },
1746 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1747 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1748 },
1749 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1750 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1751 },
1752 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1753 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1754 },
1755 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1756 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1757 },
1758 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1759 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1760 },
1761
1762 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1763 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1764 data interface instead of
1765 communications interface.
1766 Maybe we should define a new
1767 quirk for this. */
1768 },
1769 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1770 .driver_info = NO_UNION_NORMAL,
1771 },
1772 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1773 .driver_info = NO_UNION_NORMAL,
1774 },
1775 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1776 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1777 },
1778 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1779 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1780 },
1781
1782 { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1783 .driver_info = CLEAR_HALT_CONDITIONS,
1784 },
1785
1786 /* Nokia S60 phones expose two ACM channels. The first is
1787 * a modem and is picked up by the standard AT-command
1788 * information below. The second is 'vendor-specific' but
1789 * is treated as a serial device at the S60 end, so we want
1790 * to expose it on Linux too. */
1791 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1792 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1793 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1794 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1795 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1796 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1797 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1798 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1799 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1800 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1801 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1802 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1803 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1804 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1805 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1806 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1807 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1808 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1809 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1810 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1811 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1812 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1813 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1814 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1815 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1816 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1817 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1818 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1819 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1820 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1821 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1822 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1823 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1824 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1825 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1826 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1827 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1828 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1829 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1830 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1831 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1832 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1833 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1834 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1835 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1836 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1837 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1838 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1839 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1840 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1841 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1842 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1843 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1844 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1845 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1846 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1847 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1848 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1849
1850 /* Support for Owen devices */
1851 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1852
1853 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1854
1855 /* Support for Droids MuIn LCD */
1856 { USB_DEVICE(0x04d8, 0x000b),
1857 .driver_info = NO_DATA_INTERFACE,
1858 },
1859
1860#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1861 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1862 .driver_info = IGNORE_DEVICE,
1863 },
1864 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1865 .driver_info = IGNORE_DEVICE,
1866 },
1867#endif
1868
1869 /*Samsung phone in firmware update mode */
1870 { USB_DEVICE(0x04e8, 0x685d),
1871 .driver_info = IGNORE_DEVICE,
1872 },
1873
1874 /* Exclude Infineon Flash Loader utility */
1875 { USB_DEVICE(0x058b, 0x0041),
1876 .driver_info = IGNORE_DEVICE,
1877 },
1878
1879 /* control interfaces without any protocol set */
1880 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1881 USB_CDC_PROTO_NONE) },
1882
1883 /* control interfaces with various AT-command sets */
1884 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1885 USB_CDC_ACM_PROTO_AT_V25TER) },
1886 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1887 USB_CDC_ACM_PROTO_AT_PCCA101) },
1888 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1889 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1890 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1891 USB_CDC_ACM_PROTO_AT_GSM) },
1892 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1893 USB_CDC_ACM_PROTO_AT_3G) },
1894 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1895 USB_CDC_ACM_PROTO_AT_CDMA) },
1896
1897 { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1898 .driver_info = SEND_ZERO_PACKET,
1899 },
1900
1901 { }
1902};
1903
1904MODULE_DEVICE_TABLE(usb, acm_ids);
1905
1906static struct usb_driver acm_driver = {
1907 .name = "cdc_acm",
1908 .probe = acm_probe,
1909 .disconnect = acm_disconnect,
1910#ifdef CONFIG_PM
1911 .suspend = acm_suspend,
1912 .resume = acm_resume,
1913 .reset_resume = acm_reset_resume,
1914#endif
1915 .pre_reset = acm_pre_reset,
1916 .id_table = acm_ids,
1917#ifdef CONFIG_PM
1918 .supports_autosuspend = 1,
1919#endif
1920 .disable_hub_initiated_lpm = 1,
1921};
1922
1923/*
1924 * TTY driver structures.
1925 */
1926
1927static const struct tty_operations acm_ops = {
1928 .install = acm_tty_install,
1929 .open = acm_tty_open,
1930 .close = acm_tty_close,
1931 .cleanup = acm_tty_cleanup,
1932 .hangup = acm_tty_hangup,
1933 .write = acm_tty_write,
1934 .put_char = acm_tty_put_char,
1935 .flush_chars = acm_tty_flush_chars,
1936 .write_room = acm_tty_write_room,
1937 .ioctl = acm_tty_ioctl,
1938 .throttle = acm_tty_throttle,
1939 .unthrottle = acm_tty_unthrottle,
1940 .chars_in_buffer = acm_tty_chars_in_buffer,
1941 .break_ctl = acm_tty_break_ctl,
1942 .set_termios = acm_tty_set_termios,
1943 .tiocmget = acm_tty_tiocmget,
1944 .tiocmset = acm_tty_tiocmset,
1945 .get_icount = acm_tty_get_icount,
1946};
1947
1948/*
1949 * Init / exit.
1950 */
1951
1952static int __init acm_init(void)
1953{
1954 int retval;
1955 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1956 if (!acm_tty_driver)
1957 return -ENOMEM;
1958 acm_tty_driver->driver_name = "acm",
1959 acm_tty_driver->name = "ttyACM",
1960 acm_tty_driver->major = ACM_TTY_MAJOR,
1961 acm_tty_driver->minor_start = 0,
1962 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1963 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1964 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1965 acm_tty_driver->init_termios = tty_std_termios;
1966 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1967 HUPCL | CLOCAL;
1968 tty_set_operations(acm_tty_driver, &acm_ops);
1969
1970 retval = tty_register_driver(acm_tty_driver);
1971 if (retval) {
1972 put_tty_driver(acm_tty_driver);
1973 return retval;
1974 }
1975
1976 retval = usb_register(&acm_driver);
1977 if (retval) {
1978 tty_unregister_driver(acm_tty_driver);
1979 put_tty_driver(acm_tty_driver);
1980 return retval;
1981 }
1982
1983 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1984
1985 return 0;
1986}
1987
1988static void __exit acm_exit(void)
1989{
1990 usb_deregister(&acm_driver);
1991 tty_unregister_driver(acm_tty_driver);
1992 put_tty_driver(acm_tty_driver);
1993 idr_destroy(&acm_minors);
1994}
1995
1996module_init(acm_init);
1997module_exit(acm_exit);
1998
1999MODULE_AUTHOR(DRIVER_AUTHOR);
2000MODULE_DESCRIPTION(DRIVER_DESC);
2001MODULE_LICENSE("GPL");
2002MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);