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Linux 5.11-rc1
[linux-block.git] / drivers / usb / class / cdc-acm.c
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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * cdc-acm.c
4 *
5 * Copyright (c) 1999 Armin Fuerst <fuerst@in.tum.de>
6 * Copyright (c) 1999 Pavel Machek <pavel@ucw.cz>
7 * Copyright (c) 1999 Johannes Erdfelt <johannes@erdfelt.com>
8 * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz>
9 * Copyright (c) 2004 Oliver Neukum <oliver@neukum.name>
10 * Copyright (c) 2005 David Kubicek <dave@awk.cz>
11 * Copyright (c) 2011 Johan Hovold <jhovold@gmail.com>
12 *
13 * USB Abstract Control Model driver for USB modems and ISDN adapters
14 *
15 * Sponsored by SuSE
16 */
17
18#undef DEBUG
19#undef VERBOSE_DEBUG
20
21#include <linux/kernel.h>
22#include <linux/sched/signal.h>
23#include <linux/errno.h>
24#include <linux/init.h>
25#include <linux/slab.h>
26#include <linux/log2.h>
27#include <linux/tty.h>
28#include <linux/serial.h>
29#include <linux/tty_driver.h>
30#include <linux/tty_flip.h>
31#include <linux/module.h>
32#include <linux/mutex.h>
33#include <linux/uaccess.h>
34#include <linux/usb.h>
35#include <linux/usb/cdc.h>
36#include <asm/byteorder.h>
37#include <asm/unaligned.h>
38#include <linux/idr.h>
39#include <linux/list.h>
40
41#include "cdc-acm.h"
42
43
44#define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
45#define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
46
47static struct usb_driver acm_driver;
48static struct tty_driver *acm_tty_driver;
49
50static DEFINE_IDR(acm_minors);
51static DEFINE_MUTEX(acm_minors_lock);
52
53static void acm_tty_set_termios(struct tty_struct *tty,
54 struct ktermios *termios_old);
55
56/*
57 * acm_minors accessors
58 */
59
60/*
61 * Look up an ACM structure by minor. If found and not disconnected, increment
62 * its refcount and return it with its mutex held.
63 */
64static struct acm *acm_get_by_minor(unsigned int minor)
65{
66 struct acm *acm;
67
68 mutex_lock(&acm_minors_lock);
69 acm = idr_find(&acm_minors, minor);
70 if (acm) {
71 mutex_lock(&acm->mutex);
72 if (acm->disconnected) {
73 mutex_unlock(&acm->mutex);
74 acm = NULL;
75 } else {
76 tty_port_get(&acm->port);
77 mutex_unlock(&acm->mutex);
78 }
79 }
80 mutex_unlock(&acm_minors_lock);
81 return acm;
82}
83
84/*
85 * Try to find an available minor number and if found, associate it with 'acm'.
86 */
87static int acm_alloc_minor(struct acm *acm)
88{
89 int minor;
90
91 mutex_lock(&acm_minors_lock);
92 minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
93 mutex_unlock(&acm_minors_lock);
94
95 return minor;
96}
97
98/* Release the minor number associated with 'acm'. */
99static void acm_release_minor(struct acm *acm)
100{
101 mutex_lock(&acm_minors_lock);
102 idr_remove(&acm_minors, acm->minor);
103 mutex_unlock(&acm_minors_lock);
104}
105
106/*
107 * Functions for ACM control messages.
108 */
109
110static int acm_ctrl_msg(struct acm *acm, int request, int value,
111 void *buf, int len)
112{
113 int retval;
114
115 retval = usb_autopm_get_interface(acm->control);
116 if (retval)
117 return retval;
118
119 retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
120 request, USB_RT_ACM, value,
121 acm->control->altsetting[0].desc.bInterfaceNumber,
122 buf, len, 5000);
123
124 dev_dbg(&acm->control->dev,
125 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
126 __func__, request, value, len, retval);
127
128 usb_autopm_put_interface(acm->control);
129
130 return retval < 0 ? retval : 0;
131}
132
133/* devices aren't required to support these requests.
134 * the cdc acm descriptor tells whether they do...
135 */
136static inline int acm_set_control(struct acm *acm, int control)
137{
138 if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
139 return -EOPNOTSUPP;
140
141 return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
142 control, NULL, 0);
143}
144
145#define acm_set_line(acm, line) \
146 acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
147#define acm_send_break(acm, ms) \
148 acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
149
150static void acm_kill_urbs(struct acm *acm)
151{
152 int i;
153
154 usb_kill_urb(acm->ctrlurb);
155 for (i = 0; i < ACM_NW; i++)
156 usb_kill_urb(acm->wb[i].urb);
157 for (i = 0; i < acm->rx_buflimit; i++)
158 usb_kill_urb(acm->read_urbs[i]);
159}
160
161/*
162 * Write buffer management.
163 * All of these assume proper locks taken by the caller.
164 */
165
166static int acm_wb_alloc(struct acm *acm)
167{
168 int i, wbn;
169 struct acm_wb *wb;
170
171 wbn = 0;
172 i = 0;
173 for (;;) {
174 wb = &acm->wb[wbn];
175 if (!wb->use) {
176 wb->use = true;
177 wb->len = 0;
178 return wbn;
179 }
180 wbn = (wbn + 1) % ACM_NW;
181 if (++i >= ACM_NW)
182 return -1;
183 }
184}
185
186static int acm_wb_is_avail(struct acm *acm)
187{
188 int i, n;
189 unsigned long flags;
190
191 n = ACM_NW;
192 spin_lock_irqsave(&acm->write_lock, flags);
193 for (i = 0; i < ACM_NW; i++)
194 if(acm->wb[i].use)
195 n--;
196 spin_unlock_irqrestore(&acm->write_lock, flags);
197 return n;
198}
199
200/*
201 * Finish write. Caller must hold acm->write_lock
202 */
203static void acm_write_done(struct acm *acm, struct acm_wb *wb)
204{
205 wb->use = false;
206 acm->transmitting--;
207 usb_autopm_put_interface_async(acm->control);
208}
209
210/*
211 * Poke write.
212 *
213 * the caller is responsible for locking
214 */
215
216static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
217{
218 int rc;
219
220 acm->transmitting++;
221
222 wb->urb->transfer_buffer = wb->buf;
223 wb->urb->transfer_dma = wb->dmah;
224 wb->urb->transfer_buffer_length = wb->len;
225 wb->urb->dev = acm->dev;
226
227 rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
228 if (rc < 0) {
229 dev_err(&acm->data->dev,
230 "%s - usb_submit_urb(write bulk) failed: %d\n",
231 __func__, rc);
232 acm_write_done(acm, wb);
233 }
234 return rc;
235}
236
237/*
238 * attributes exported through sysfs
239 */
240static ssize_t bmCapabilities_show
241(struct device *dev, struct device_attribute *attr, char *buf)
242{
243 struct usb_interface *intf = to_usb_interface(dev);
244 struct acm *acm = usb_get_intfdata(intf);
245
246 return sprintf(buf, "%d", acm->ctrl_caps);
247}
248static DEVICE_ATTR_RO(bmCapabilities);
249
250static ssize_t wCountryCodes_show
251(struct device *dev, struct device_attribute *attr, char *buf)
252{
253 struct usb_interface *intf = to_usb_interface(dev);
254 struct acm *acm = usb_get_intfdata(intf);
255
256 memcpy(buf, acm->country_codes, acm->country_code_size);
257 return acm->country_code_size;
258}
259
260static DEVICE_ATTR_RO(wCountryCodes);
261
262static ssize_t iCountryCodeRelDate_show
263(struct device *dev, struct device_attribute *attr, char *buf)
264{
265 struct usb_interface *intf = to_usb_interface(dev);
266 struct acm *acm = usb_get_intfdata(intf);
267
268 return sprintf(buf, "%d", acm->country_rel_date);
269}
270
271static DEVICE_ATTR_RO(iCountryCodeRelDate);
272/*
273 * Interrupt handlers for various ACM device responses
274 */
275
276static void acm_process_notification(struct acm *acm, unsigned char *buf)
277{
278 int newctrl;
279 int difference;
280 unsigned long flags;
281 struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
282 unsigned char *data = buf + sizeof(struct usb_cdc_notification);
283
284 switch (dr->bNotificationType) {
285 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
286 dev_dbg(&acm->control->dev,
287 "%s - network connection: %d\n", __func__, dr->wValue);
288 break;
289
290 case USB_CDC_NOTIFY_SERIAL_STATE:
291 if (le16_to_cpu(dr->wLength) != 2) {
292 dev_dbg(&acm->control->dev,
293 "%s - malformed serial state\n", __func__);
294 break;
295 }
296
297 newctrl = get_unaligned_le16(data);
298 dev_dbg(&acm->control->dev,
299 "%s - serial state: 0x%x\n", __func__, newctrl);
300
301 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
302 dev_dbg(&acm->control->dev,
303 "%s - calling hangup\n", __func__);
304 tty_port_tty_hangup(&acm->port, false);
305 }
306
307 difference = acm->ctrlin ^ newctrl;
308 spin_lock_irqsave(&acm->read_lock, flags);
309 acm->ctrlin = newctrl;
310 acm->oldcount = acm->iocount;
311
312 if (difference & ACM_CTRL_DSR)
313 acm->iocount.dsr++;
314 if (difference & ACM_CTRL_DCD)
315 acm->iocount.dcd++;
316 if (newctrl & ACM_CTRL_BRK)
317 acm->iocount.brk++;
318 if (newctrl & ACM_CTRL_RI)
319 acm->iocount.rng++;
320 if (newctrl & ACM_CTRL_FRAMING)
321 acm->iocount.frame++;
322 if (newctrl & ACM_CTRL_PARITY)
323 acm->iocount.parity++;
324 if (newctrl & ACM_CTRL_OVERRUN)
325 acm->iocount.overrun++;
326 spin_unlock_irqrestore(&acm->read_lock, flags);
327
328 if (difference)
329 wake_up_all(&acm->wioctl);
330
331 break;
332
333 default:
334 dev_dbg(&acm->control->dev,
335 "%s - unknown notification %d received: index %d len %d\n",
336 __func__,
337 dr->bNotificationType, dr->wIndex, dr->wLength);
338 }
339}
340
341/* control interface reports status changes with "interrupt" transfers */
342static void acm_ctrl_irq(struct urb *urb)
343{
344 struct acm *acm = urb->context;
345 struct usb_cdc_notification *dr = urb->transfer_buffer;
346 unsigned int current_size = urb->actual_length;
347 unsigned int expected_size, copy_size, alloc_size;
348 int retval;
349 int status = urb->status;
350
351 switch (status) {
352 case 0:
353 /* success */
354 break;
355 case -ECONNRESET:
356 case -ENOENT:
357 case -ESHUTDOWN:
358 /* this urb is terminated, clean up */
359 dev_dbg(&acm->control->dev,
360 "%s - urb shutting down with status: %d\n",
361 __func__, status);
362 return;
363 default:
364 dev_dbg(&acm->control->dev,
365 "%s - nonzero urb status received: %d\n",
366 __func__, status);
367 goto exit;
368 }
369
370 usb_mark_last_busy(acm->dev);
371
372 if (acm->nb_index)
373 dr = (struct usb_cdc_notification *)acm->notification_buffer;
374
375 /* size = notification-header + (optional) data */
376 expected_size = sizeof(struct usb_cdc_notification) +
377 le16_to_cpu(dr->wLength);
378
379 if (current_size < expected_size) {
380 /* notification is transmitted fragmented, reassemble */
381 if (acm->nb_size < expected_size) {
382 u8 *new_buffer;
383 alloc_size = roundup_pow_of_two(expected_size);
384 /* Final freeing is done on disconnect. */
385 new_buffer = krealloc(acm->notification_buffer,
386 alloc_size, GFP_ATOMIC);
387 if (!new_buffer) {
388 acm->nb_index = 0;
389 goto exit;
390 }
391
392 acm->notification_buffer = new_buffer;
393 acm->nb_size = alloc_size;
394 dr = (struct usb_cdc_notification *)acm->notification_buffer;
395 }
396
397 copy_size = min(current_size,
398 expected_size - acm->nb_index);
399
400 memcpy(&acm->notification_buffer[acm->nb_index],
401 urb->transfer_buffer, copy_size);
402 acm->nb_index += copy_size;
403 current_size = acm->nb_index;
404 }
405
406 if (current_size >= expected_size) {
407 /* notification complete */
408 acm_process_notification(acm, (unsigned char *)dr);
409 acm->nb_index = 0;
410 }
411
412exit:
413 retval = usb_submit_urb(urb, GFP_ATOMIC);
414 if (retval && retval != -EPERM && retval != -ENODEV)
415 dev_err(&acm->control->dev,
416 "%s - usb_submit_urb failed: %d\n", __func__, retval);
417 else
418 dev_vdbg(&acm->control->dev,
419 "control resubmission terminated %d\n", retval);
420}
421
422static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
423{
424 int res;
425
426 if (!test_and_clear_bit(index, &acm->read_urbs_free))
427 return 0;
428
429 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
430 if (res) {
431 if (res != -EPERM && res != -ENODEV) {
432 dev_err(&acm->data->dev,
433 "urb %d failed submission with %d\n",
434 index, res);
435 } else {
436 dev_vdbg(&acm->data->dev, "intended failure %d\n", res);
437 }
438 set_bit(index, &acm->read_urbs_free);
439 return res;
440 } else {
441 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
442 }
443
444 return 0;
445}
446
447static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
448{
449 int res;
450 int i;
451
452 for (i = 0; i < acm->rx_buflimit; ++i) {
453 res = acm_submit_read_urb(acm, i, mem_flags);
454 if (res)
455 return res;
456 }
457
458 return 0;
459}
460
461static void acm_process_read_urb(struct acm *acm, struct urb *urb)
462{
463 if (!urb->actual_length)
464 return;
465
466 tty_insert_flip_string(&acm->port, urb->transfer_buffer,
467 urb->actual_length);
468 tty_flip_buffer_push(&acm->port);
469}
470
471static void acm_read_bulk_callback(struct urb *urb)
472{
473 struct acm_rb *rb = urb->context;
474 struct acm *acm = rb->instance;
475 int status = urb->status;
476 bool stopped = false;
477 bool stalled = false;
478 bool cooldown = false;
479
480 dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
481 rb->index, urb->actual_length, status);
482
483 if (!acm->dev) {
484 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
485 return;
486 }
487
488 switch (status) {
489 case 0:
490 usb_mark_last_busy(acm->dev);
491 acm_process_read_urb(acm, urb);
492 break;
493 case -EPIPE:
494 set_bit(EVENT_RX_STALL, &acm->flags);
495 stalled = true;
496 break;
497 case -ENOENT:
498 case -ECONNRESET:
499 case -ESHUTDOWN:
500 dev_dbg(&acm->data->dev,
501 "%s - urb shutting down with status: %d\n",
502 __func__, status);
503 stopped = true;
504 break;
505 case -EOVERFLOW:
506 case -EPROTO:
507 dev_dbg(&acm->data->dev,
508 "%s - cooling babbling device\n", __func__);
509 usb_mark_last_busy(acm->dev);
510 set_bit(rb->index, &acm->urbs_in_error_delay);
511 set_bit(ACM_ERROR_DELAY, &acm->flags);
512 cooldown = true;
513 break;
514 default:
515 dev_dbg(&acm->data->dev,
516 "%s - nonzero urb status received: %d\n",
517 __func__, status);
518 break;
519 }
520
521 /*
522 * Make sure URB processing is done before marking as free to avoid
523 * racing with unthrottle() on another CPU. Matches the barriers
524 * implied by the test_and_clear_bit() in acm_submit_read_urb().
525 */
526 smp_mb__before_atomic();
527 set_bit(rb->index, &acm->read_urbs_free);
528 /*
529 * Make sure URB is marked as free before checking the throttled flag
530 * to avoid racing with unthrottle() on another CPU. Matches the
531 * smp_mb() in unthrottle().
532 */
533 smp_mb__after_atomic();
534
535 if (stopped || stalled || cooldown) {
536 if (stalled)
537 schedule_delayed_work(&acm->dwork, 0);
538 else if (cooldown)
539 schedule_delayed_work(&acm->dwork, HZ / 2);
540 return;
541 }
542
543 if (test_bit(ACM_THROTTLED, &acm->flags))
544 return;
545
546 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
547}
548
549/* data interface wrote those outgoing bytes */
550static void acm_write_bulk(struct urb *urb)
551{
552 struct acm_wb *wb = urb->context;
553 struct acm *acm = wb->instance;
554 unsigned long flags;
555 int status = urb->status;
556
557 if (status || (urb->actual_length != urb->transfer_buffer_length))
558 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
559 urb->actual_length,
560 urb->transfer_buffer_length,
561 status);
562
563 spin_lock_irqsave(&acm->write_lock, flags);
564 acm_write_done(acm, wb);
565 spin_unlock_irqrestore(&acm->write_lock, flags);
566 set_bit(EVENT_TTY_WAKEUP, &acm->flags);
567 schedule_delayed_work(&acm->dwork, 0);
568}
569
570static void acm_softint(struct work_struct *work)
571{
572 int i;
573 struct acm *acm = container_of(work, struct acm, dwork.work);
574
575 if (test_bit(EVENT_RX_STALL, &acm->flags)) {
576 smp_mb(); /* against acm_suspend() */
577 if (!acm->susp_count) {
578 for (i = 0; i < acm->rx_buflimit; i++)
579 usb_kill_urb(acm->read_urbs[i]);
580 usb_clear_halt(acm->dev, acm->in);
581 acm_submit_read_urbs(acm, GFP_KERNEL);
582 clear_bit(EVENT_RX_STALL, &acm->flags);
583 }
584 }
585
586 if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
587 for (i = 0; i < acm->rx_buflimit; i++)
588 if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
589 acm_submit_read_urb(acm, i, GFP_KERNEL);
590 }
591
592 if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
593 tty_port_tty_wakeup(&acm->port);
594}
595
596/*
597 * TTY handlers
598 */
599
600static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
601{
602 struct acm *acm;
603 int retval;
604
605 acm = acm_get_by_minor(tty->index);
606 if (!acm)
607 return -ENODEV;
608
609 retval = tty_standard_install(driver, tty);
610 if (retval)
611 goto error_init_termios;
612
613 /*
614 * Suppress initial echoing for some devices which might send data
615 * immediately after acm driver has been installed.
616 */
617 if (acm->quirks & DISABLE_ECHO)
618 tty->termios.c_lflag &= ~ECHO;
619
620 tty->driver_data = acm;
621
622 return 0;
623
624error_init_termios:
625 tty_port_put(&acm->port);
626 return retval;
627}
628
629static int acm_tty_open(struct tty_struct *tty, struct file *filp)
630{
631 struct acm *acm = tty->driver_data;
632
633 return tty_port_open(&acm->port, tty, filp);
634}
635
636static void acm_port_dtr_rts(struct tty_port *port, int raise)
637{
638 struct acm *acm = container_of(port, struct acm, port);
639 int val;
640 int res;
641
642 if (raise)
643 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
644 else
645 val = 0;
646
647 /* FIXME: add missing ctrlout locking throughout driver */
648 acm->ctrlout = val;
649
650 res = acm_set_control(acm, val);
651 if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
652 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
653}
654
655static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
656{
657 struct acm *acm = container_of(port, struct acm, port);
658 int retval = -ENODEV;
659 int i;
660
661 mutex_lock(&acm->mutex);
662 if (acm->disconnected)
663 goto disconnected;
664
665 retval = usb_autopm_get_interface(acm->control);
666 if (retval)
667 goto error_get_interface;
668
669 /*
670 * FIXME: Why do we need this? Allocating 64K of physically contiguous
671 * memory is really nasty...
672 */
673 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
674 acm->control->needs_remote_wakeup = 1;
675
676 acm->ctrlurb->dev = acm->dev;
677 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
678 if (retval) {
679 dev_err(&acm->control->dev,
680 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
681 goto error_submit_urb;
682 }
683
684 acm_tty_set_termios(tty, NULL);
685
686 /*
687 * Unthrottle device in case the TTY was closed while throttled.
688 */
689 clear_bit(ACM_THROTTLED, &acm->flags);
690
691 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
692 if (retval)
693 goto error_submit_read_urbs;
694
695 usb_autopm_put_interface(acm->control);
696
697 mutex_unlock(&acm->mutex);
698
699 return 0;
700
701error_submit_read_urbs:
702 for (i = 0; i < acm->rx_buflimit; i++)
703 usb_kill_urb(acm->read_urbs[i]);
704 usb_kill_urb(acm->ctrlurb);
705error_submit_urb:
706 usb_autopm_put_interface(acm->control);
707error_get_interface:
708disconnected:
709 mutex_unlock(&acm->mutex);
710
711 return usb_translate_errors(retval);
712}
713
714static void acm_port_destruct(struct tty_port *port)
715{
716 struct acm *acm = container_of(port, struct acm, port);
717
718 acm_release_minor(acm);
719 usb_put_intf(acm->control);
720 kfree(acm->country_codes);
721 kfree(acm);
722}
723
724static void acm_port_shutdown(struct tty_port *port)
725{
726 struct acm *acm = container_of(port, struct acm, port);
727 struct urb *urb;
728 struct acm_wb *wb;
729
730 /*
731 * Need to grab write_lock to prevent race with resume, but no need to
732 * hold it due to the tty-port initialised flag.
733 */
734 spin_lock_irq(&acm->write_lock);
735 spin_unlock_irq(&acm->write_lock);
736
737 usb_autopm_get_interface_no_resume(acm->control);
738 acm->control->needs_remote_wakeup = 0;
739 usb_autopm_put_interface(acm->control);
740
741 for (;;) {
742 urb = usb_get_from_anchor(&acm->delayed);
743 if (!urb)
744 break;
745 wb = urb->context;
746 wb->use = false;
747 usb_autopm_put_interface_async(acm->control);
748 }
749
750 acm_kill_urbs(acm);
751}
752
753static void acm_tty_cleanup(struct tty_struct *tty)
754{
755 struct acm *acm = tty->driver_data;
756
757 tty_port_put(&acm->port);
758}
759
760static void acm_tty_hangup(struct tty_struct *tty)
761{
762 struct acm *acm = tty->driver_data;
763
764 tty_port_hangup(&acm->port);
765}
766
767static void acm_tty_close(struct tty_struct *tty, struct file *filp)
768{
769 struct acm *acm = tty->driver_data;
770
771 tty_port_close(&acm->port, tty, filp);
772}
773
774static int acm_tty_write(struct tty_struct *tty,
775 const unsigned char *buf, int count)
776{
777 struct acm *acm = tty->driver_data;
778 int stat;
779 unsigned long flags;
780 int wbn;
781 struct acm_wb *wb;
782
783 if (!count)
784 return 0;
785
786 dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
787
788 spin_lock_irqsave(&acm->write_lock, flags);
789 wbn = acm_wb_alloc(acm);
790 if (wbn < 0) {
791 spin_unlock_irqrestore(&acm->write_lock, flags);
792 return 0;
793 }
794 wb = &acm->wb[wbn];
795
796 if (!acm->dev) {
797 wb->use = false;
798 spin_unlock_irqrestore(&acm->write_lock, flags);
799 return -ENODEV;
800 }
801
802 count = (count > acm->writesize) ? acm->writesize : count;
803 dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
804 memcpy(wb->buf, buf, count);
805 wb->len = count;
806
807 stat = usb_autopm_get_interface_async(acm->control);
808 if (stat) {
809 wb->use = false;
810 spin_unlock_irqrestore(&acm->write_lock, flags);
811 return stat;
812 }
813
814 if (acm->susp_count) {
815 usb_anchor_urb(wb->urb, &acm->delayed);
816 spin_unlock_irqrestore(&acm->write_lock, flags);
817 return count;
818 }
819
820 stat = acm_start_wb(acm, wb);
821 spin_unlock_irqrestore(&acm->write_lock, flags);
822
823 if (stat < 0)
824 return stat;
825 return count;
826}
827
828static int acm_tty_write_room(struct tty_struct *tty)
829{
830 struct acm *acm = tty->driver_data;
831 /*
832 * Do not let the line discipline to know that we have a reserve,
833 * or it might get too enthusiastic.
834 */
835 return acm_wb_is_avail(acm) ? acm->writesize : 0;
836}
837
838static int acm_tty_chars_in_buffer(struct tty_struct *tty)
839{
840 struct acm *acm = tty->driver_data;
841 /*
842 * if the device was unplugged then any remaining characters fell out
843 * of the connector ;)
844 */
845 if (acm->disconnected)
846 return 0;
847 /*
848 * This is inaccurate (overcounts), but it works.
849 */
850 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
851}
852
853static void acm_tty_throttle(struct tty_struct *tty)
854{
855 struct acm *acm = tty->driver_data;
856
857 set_bit(ACM_THROTTLED, &acm->flags);
858}
859
860static void acm_tty_unthrottle(struct tty_struct *tty)
861{
862 struct acm *acm = tty->driver_data;
863
864 clear_bit(ACM_THROTTLED, &acm->flags);
865
866 /* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
867 smp_mb();
868
869 acm_submit_read_urbs(acm, GFP_KERNEL);
870}
871
872static int acm_tty_break_ctl(struct tty_struct *tty, int state)
873{
874 struct acm *acm = tty->driver_data;
875 int retval;
876
877 retval = acm_send_break(acm, state ? 0xffff : 0);
878 if (retval < 0)
879 dev_dbg(&acm->control->dev,
880 "%s - send break failed\n", __func__);
881 return retval;
882}
883
884static int acm_tty_tiocmget(struct tty_struct *tty)
885{
886 struct acm *acm = tty->driver_data;
887
888 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
889 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
890 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
891 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
892 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
893 TIOCM_CTS;
894}
895
896static int acm_tty_tiocmset(struct tty_struct *tty,
897 unsigned int set, unsigned int clear)
898{
899 struct acm *acm = tty->driver_data;
900 unsigned int newctrl;
901
902 newctrl = acm->ctrlout;
903 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
904 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
905 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
906 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
907
908 newctrl = (newctrl & ~clear) | set;
909
910 if (acm->ctrlout == newctrl)
911 return 0;
912 return acm_set_control(acm, acm->ctrlout = newctrl);
913}
914
915static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
916{
917 struct acm *acm = tty->driver_data;
918
919 ss->xmit_fifo_size = acm->writesize;
920 ss->baud_base = le32_to_cpu(acm->line.dwDTERate);
921 ss->close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
922 ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
923 ASYNC_CLOSING_WAIT_NONE :
924 jiffies_to_msecs(acm->port.closing_wait) / 10;
925 return 0;
926}
927
928static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
929{
930 struct acm *acm = tty->driver_data;
931 unsigned int closing_wait, close_delay;
932 unsigned int old_closing_wait, old_close_delay;
933 int retval = 0;
934
935 close_delay = msecs_to_jiffies(ss->close_delay * 10);
936 closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
937 ASYNC_CLOSING_WAIT_NONE :
938 msecs_to_jiffies(ss->closing_wait * 10);
939
940 /* we must redo the rounding here, so that the values match */
941 old_close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
942 old_closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
943 ASYNC_CLOSING_WAIT_NONE :
944 jiffies_to_msecs(acm->port.closing_wait) / 10;
945
946 mutex_lock(&acm->port.mutex);
947
948 if (!capable(CAP_SYS_ADMIN)) {
949 if ((ss->close_delay != old_close_delay) ||
950 (ss->closing_wait != old_closing_wait))
951 retval = -EPERM;
952 else
953 retval = -EOPNOTSUPP;
954 } else {
955 acm->port.close_delay = close_delay;
956 acm->port.closing_wait = closing_wait;
957 }
958
959 mutex_unlock(&acm->port.mutex);
960 return retval;
961}
962
963static int wait_serial_change(struct acm *acm, unsigned long arg)
964{
965 int rv = 0;
966 DECLARE_WAITQUEUE(wait, current);
967 struct async_icount old, new;
968
969 do {
970 spin_lock_irq(&acm->read_lock);
971 old = acm->oldcount;
972 new = acm->iocount;
973 acm->oldcount = new;
974 spin_unlock_irq(&acm->read_lock);
975
976 if ((arg & TIOCM_DSR) &&
977 old.dsr != new.dsr)
978 break;
979 if ((arg & TIOCM_CD) &&
980 old.dcd != new.dcd)
981 break;
982 if ((arg & TIOCM_RI) &&
983 old.rng != new.rng)
984 break;
985
986 add_wait_queue(&acm->wioctl, &wait);
987 set_current_state(TASK_INTERRUPTIBLE);
988 schedule();
989 remove_wait_queue(&acm->wioctl, &wait);
990 if (acm->disconnected) {
991 if (arg & TIOCM_CD)
992 break;
993 else
994 rv = -ENODEV;
995 } else {
996 if (signal_pending(current))
997 rv = -ERESTARTSYS;
998 }
999 } while (!rv);
1000
1001
1002
1003 return rv;
1004}
1005
1006static int acm_tty_get_icount(struct tty_struct *tty,
1007 struct serial_icounter_struct *icount)
1008{
1009 struct acm *acm = tty->driver_data;
1010
1011 icount->dsr = acm->iocount.dsr;
1012 icount->rng = acm->iocount.rng;
1013 icount->dcd = acm->iocount.dcd;
1014 icount->frame = acm->iocount.frame;
1015 icount->overrun = acm->iocount.overrun;
1016 icount->parity = acm->iocount.parity;
1017 icount->brk = acm->iocount.brk;
1018
1019 return 0;
1020}
1021
1022static int acm_tty_ioctl(struct tty_struct *tty,
1023 unsigned int cmd, unsigned long arg)
1024{
1025 struct acm *acm = tty->driver_data;
1026 int rv = -ENOIOCTLCMD;
1027
1028 switch (cmd) {
1029 case TIOCMIWAIT:
1030 rv = usb_autopm_get_interface(acm->control);
1031 if (rv < 0) {
1032 rv = -EIO;
1033 break;
1034 }
1035 rv = wait_serial_change(acm, arg);
1036 usb_autopm_put_interface(acm->control);
1037 break;
1038 }
1039
1040 return rv;
1041}
1042
1043static void acm_tty_set_termios(struct tty_struct *tty,
1044 struct ktermios *termios_old)
1045{
1046 struct acm *acm = tty->driver_data;
1047 struct ktermios *termios = &tty->termios;
1048 struct usb_cdc_line_coding newline;
1049 int newctrl = acm->ctrlout;
1050
1051 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1052 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1053 newline.bParityType = termios->c_cflag & PARENB ?
1054 (termios->c_cflag & PARODD ? 1 : 2) +
1055 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1056 switch (termios->c_cflag & CSIZE) {
1057 case CS5:
1058 newline.bDataBits = 5;
1059 break;
1060 case CS6:
1061 newline.bDataBits = 6;
1062 break;
1063 case CS7:
1064 newline.bDataBits = 7;
1065 break;
1066 case CS8:
1067 default:
1068 newline.bDataBits = 8;
1069 break;
1070 }
1071 /* FIXME: Needs to clear unsupported bits in the termios */
1072 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1073
1074 if (C_BAUD(tty) == B0) {
1075 newline.dwDTERate = acm->line.dwDTERate;
1076 newctrl &= ~ACM_CTRL_DTR;
1077 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1078 newctrl |= ACM_CTRL_DTR;
1079 }
1080
1081 if (newctrl != acm->ctrlout)
1082 acm_set_control(acm, acm->ctrlout = newctrl);
1083
1084 if (memcmp(&acm->line, &newline, sizeof newline)) {
1085 memcpy(&acm->line, &newline, sizeof newline);
1086 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1087 __func__,
1088 le32_to_cpu(newline.dwDTERate),
1089 newline.bCharFormat, newline.bParityType,
1090 newline.bDataBits);
1091 acm_set_line(acm, &acm->line);
1092 }
1093}
1094
1095static const struct tty_port_operations acm_port_ops = {
1096 .dtr_rts = acm_port_dtr_rts,
1097 .shutdown = acm_port_shutdown,
1098 .activate = acm_port_activate,
1099 .destruct = acm_port_destruct,
1100};
1101
1102/*
1103 * USB probe and disconnect routines.
1104 */
1105
1106/* Little helpers: write/read buffers free */
1107static void acm_write_buffers_free(struct acm *acm)
1108{
1109 int i;
1110 struct acm_wb *wb;
1111
1112 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1113 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1114}
1115
1116static void acm_read_buffers_free(struct acm *acm)
1117{
1118 int i;
1119
1120 for (i = 0; i < acm->rx_buflimit; i++)
1121 usb_free_coherent(acm->dev, acm->readsize,
1122 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1123}
1124
1125/* Little helper: write buffers allocate */
1126static int acm_write_buffers_alloc(struct acm *acm)
1127{
1128 int i;
1129 struct acm_wb *wb;
1130
1131 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1132 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1133 &wb->dmah);
1134 if (!wb->buf) {
1135 while (i != 0) {
1136 --i;
1137 --wb;
1138 usb_free_coherent(acm->dev, acm->writesize,
1139 wb->buf, wb->dmah);
1140 }
1141 return -ENOMEM;
1142 }
1143 }
1144 return 0;
1145}
1146
1147static int acm_probe(struct usb_interface *intf,
1148 const struct usb_device_id *id)
1149{
1150 struct usb_cdc_union_desc *union_header = NULL;
1151 struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1152 unsigned char *buffer = intf->altsetting->extra;
1153 int buflen = intf->altsetting->extralen;
1154 struct usb_interface *control_interface;
1155 struct usb_interface *data_interface;
1156 struct usb_endpoint_descriptor *epctrl = NULL;
1157 struct usb_endpoint_descriptor *epread = NULL;
1158 struct usb_endpoint_descriptor *epwrite = NULL;
1159 struct usb_device *usb_dev = interface_to_usbdev(intf);
1160 struct usb_cdc_parsed_header h;
1161 struct acm *acm;
1162 int minor;
1163 int ctrlsize, readsize;
1164 u8 *buf;
1165 int call_intf_num = -1;
1166 int data_intf_num = -1;
1167 unsigned long quirks;
1168 int num_rx_buf;
1169 int i;
1170 int combined_interfaces = 0;
1171 struct device *tty_dev;
1172 int rv = -ENOMEM;
1173 int res;
1174
1175 /* normal quirks */
1176 quirks = (unsigned long)id->driver_info;
1177
1178 if (quirks == IGNORE_DEVICE)
1179 return -ENODEV;
1180
1181 memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1182
1183 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1184
1185 /* handle quirks deadly to normal probing*/
1186 if (quirks == NO_UNION_NORMAL) {
1187 data_interface = usb_ifnum_to_if(usb_dev, 1);
1188 control_interface = usb_ifnum_to_if(usb_dev, 0);
1189 /* we would crash */
1190 if (!data_interface || !control_interface)
1191 return -ENODEV;
1192 goto skip_normal_probe;
1193 }
1194
1195 /* normal probing*/
1196 if (!buffer) {
1197 dev_err(&intf->dev, "Weird descriptor references\n");
1198 return -EINVAL;
1199 }
1200
1201 if (!buflen) {
1202 if (intf->cur_altsetting->endpoint &&
1203 intf->cur_altsetting->endpoint->extralen &&
1204 intf->cur_altsetting->endpoint->extra) {
1205 dev_dbg(&intf->dev,
1206 "Seeking extra descriptors on endpoint\n");
1207 buflen = intf->cur_altsetting->endpoint->extralen;
1208 buffer = intf->cur_altsetting->endpoint->extra;
1209 } else {
1210 dev_err(&intf->dev,
1211 "Zero length descriptor references\n");
1212 return -EINVAL;
1213 }
1214 }
1215
1216 cdc_parse_cdc_header(&h, intf, buffer, buflen);
1217 union_header = h.usb_cdc_union_desc;
1218 cmgmd = h.usb_cdc_call_mgmt_descriptor;
1219 if (cmgmd)
1220 call_intf_num = cmgmd->bDataInterface;
1221
1222 if (!union_header) {
1223 if (intf->cur_altsetting->desc.bNumEndpoints == 3) {
1224 dev_dbg(&intf->dev, "No union descriptor, assuming single interface\n");
1225 combined_interfaces = 1;
1226 control_interface = data_interface = intf;
1227 goto look_for_collapsed_interface;
1228 } else if (call_intf_num > 0) {
1229 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1230 data_intf_num = call_intf_num;
1231 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1232 control_interface = intf;
1233 } else {
1234 dev_dbg(&intf->dev, "No union descriptor, giving up\n");
1235 return -ENODEV;
1236 }
1237 } else {
1238 int class = -1;
1239
1240 data_intf_num = union_header->bSlaveInterface0;
1241 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1242 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1243
1244 if (control_interface)
1245 class = control_interface->cur_altsetting->desc.bInterfaceClass;
1246
1247 if (class != USB_CLASS_COMM && class != USB_CLASS_CDC_DATA) {
1248 dev_dbg(&intf->dev, "Broken union descriptor, assuming single interface\n");
1249 combined_interfaces = 1;
1250 control_interface = data_interface = intf;
1251 goto look_for_collapsed_interface;
1252 }
1253 }
1254
1255 if (!control_interface || !data_interface) {
1256 dev_dbg(&intf->dev, "no interfaces\n");
1257 return -ENODEV;
1258 }
1259
1260 if (data_intf_num != call_intf_num)
1261 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1262
1263 if (control_interface == data_interface) {
1264 /* some broken devices designed for windows work this way */
1265 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1266 combined_interfaces = 1;
1267 /* a popular other OS doesn't use it */
1268 quirks |= NO_CAP_LINE;
1269 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1270 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1271 return -EINVAL;
1272 }
1273look_for_collapsed_interface:
1274 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1275 &epread, &epwrite, &epctrl, NULL);
1276 if (res)
1277 return res;
1278
1279 goto made_compressed_probe;
1280 }
1281
1282skip_normal_probe:
1283
1284 /*workaround for switched interfaces */
1285 if (data_interface->cur_altsetting->desc.bInterfaceClass != USB_CLASS_CDC_DATA) {
1286 if (control_interface->cur_altsetting->desc.bInterfaceClass == USB_CLASS_CDC_DATA) {
1287 dev_dbg(&intf->dev,
1288 "Your device has switched interfaces.\n");
1289 swap(control_interface, data_interface);
1290 } else {
1291 return -EINVAL;
1292 }
1293 }
1294
1295 /* Accept probe requests only for the control interface */
1296 if (!combined_interfaces && intf != control_interface)
1297 return -ENODEV;
1298
1299 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1300 /* valid in this context */
1301 dev_dbg(&intf->dev, "The data interface isn't available\n");
1302 return -EBUSY;
1303 }
1304
1305
1306 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1307 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1308 return -EINVAL;
1309
1310 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1311 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1312 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1313
1314
1315 /* workaround for switched endpoints */
1316 if (!usb_endpoint_dir_in(epread)) {
1317 /* descriptors are swapped */
1318 dev_dbg(&intf->dev,
1319 "The data interface has switched endpoints\n");
1320 swap(epread, epwrite);
1321 }
1322made_compressed_probe:
1323 dev_dbg(&intf->dev, "interfaces are valid\n");
1324
1325 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1326 if (acm == NULL)
1327 goto alloc_fail;
1328
1329 tty_port_init(&acm->port);
1330 acm->port.ops = &acm_port_ops;
1331
1332 ctrlsize = usb_endpoint_maxp(epctrl);
1333 readsize = usb_endpoint_maxp(epread) *
1334 (quirks == SINGLE_RX_URB ? 1 : 2);
1335 acm->combined_interfaces = combined_interfaces;
1336 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1337 acm->control = control_interface;
1338 acm->data = data_interface;
1339
1340 usb_get_intf(acm->control); /* undone in destruct() */
1341
1342 minor = acm_alloc_minor(acm);
1343 if (minor < 0)
1344 goto alloc_fail1;
1345
1346 acm->minor = minor;
1347 acm->dev = usb_dev;
1348 if (h.usb_cdc_acm_descriptor)
1349 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1350 if (quirks & NO_CAP_LINE)
1351 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1352 acm->ctrlsize = ctrlsize;
1353 acm->readsize = readsize;
1354 acm->rx_buflimit = num_rx_buf;
1355 INIT_DELAYED_WORK(&acm->dwork, acm_softint);
1356 init_waitqueue_head(&acm->wioctl);
1357 spin_lock_init(&acm->write_lock);
1358 spin_lock_init(&acm->read_lock);
1359 mutex_init(&acm->mutex);
1360 if (usb_endpoint_xfer_int(epread)) {
1361 acm->bInterval = epread->bInterval;
1362 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1363 } else {
1364 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1365 }
1366 if (usb_endpoint_xfer_int(epwrite))
1367 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1368 else
1369 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1370 init_usb_anchor(&acm->delayed);
1371 acm->quirks = quirks;
1372
1373 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1374 if (!buf)
1375 goto alloc_fail1;
1376 acm->ctrl_buffer = buf;
1377
1378 if (acm_write_buffers_alloc(acm) < 0)
1379 goto alloc_fail2;
1380
1381 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1382 if (!acm->ctrlurb)
1383 goto alloc_fail3;
1384
1385 for (i = 0; i < num_rx_buf; i++) {
1386 struct acm_rb *rb = &(acm->read_buffers[i]);
1387 struct urb *urb;
1388
1389 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1390 &rb->dma);
1391 if (!rb->base)
1392 goto alloc_fail4;
1393 rb->index = i;
1394 rb->instance = acm;
1395
1396 urb = usb_alloc_urb(0, GFP_KERNEL);
1397 if (!urb)
1398 goto alloc_fail4;
1399
1400 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1401 urb->transfer_dma = rb->dma;
1402 if (usb_endpoint_xfer_int(epread))
1403 usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1404 acm->readsize,
1405 acm_read_bulk_callback, rb,
1406 acm->bInterval);
1407 else
1408 usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1409 acm->readsize,
1410 acm_read_bulk_callback, rb);
1411
1412 acm->read_urbs[i] = urb;
1413 __set_bit(i, &acm->read_urbs_free);
1414 }
1415 for (i = 0; i < ACM_NW; i++) {
1416 struct acm_wb *snd = &(acm->wb[i]);
1417
1418 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1419 if (snd->urb == NULL)
1420 goto alloc_fail5;
1421
1422 if (usb_endpoint_xfer_int(epwrite))
1423 usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1424 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1425 else
1426 usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1427 NULL, acm->writesize, acm_write_bulk, snd);
1428 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1429 if (quirks & SEND_ZERO_PACKET)
1430 snd->urb->transfer_flags |= URB_ZERO_PACKET;
1431 snd->instance = acm;
1432 }
1433
1434 usb_set_intfdata(intf, acm);
1435
1436 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1437 if (i < 0)
1438 goto alloc_fail5;
1439
1440 if (h.usb_cdc_country_functional_desc) { /* export the country data */
1441 struct usb_cdc_country_functional_desc * cfd =
1442 h.usb_cdc_country_functional_desc;
1443
1444 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1445 if (!acm->country_codes)
1446 goto skip_countries;
1447 acm->country_code_size = cfd->bLength - 4;
1448 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1449 cfd->bLength - 4);
1450 acm->country_rel_date = cfd->iCountryCodeRelDate;
1451
1452 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1453 if (i < 0) {
1454 kfree(acm->country_codes);
1455 acm->country_codes = NULL;
1456 acm->country_code_size = 0;
1457 goto skip_countries;
1458 }
1459
1460 i = device_create_file(&intf->dev,
1461 &dev_attr_iCountryCodeRelDate);
1462 if (i < 0) {
1463 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1464 kfree(acm->country_codes);
1465 acm->country_codes = NULL;
1466 acm->country_code_size = 0;
1467 goto skip_countries;
1468 }
1469 }
1470
1471skip_countries:
1472 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1473 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1474 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1475 /* works around buggy devices */
1476 epctrl->bInterval ? epctrl->bInterval : 16);
1477 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1478 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1479 acm->notification_buffer = NULL;
1480 acm->nb_index = 0;
1481 acm->nb_size = 0;
1482
1483 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1484
1485 acm->line.dwDTERate = cpu_to_le32(9600);
1486 acm->line.bDataBits = 8;
1487 acm_set_line(acm, &acm->line);
1488
1489 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1490 usb_set_intfdata(data_interface, acm);
1491
1492 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1493 &control_interface->dev);
1494 if (IS_ERR(tty_dev)) {
1495 rv = PTR_ERR(tty_dev);
1496 goto alloc_fail6;
1497 }
1498
1499 if (quirks & CLEAR_HALT_CONDITIONS) {
1500 usb_clear_halt(usb_dev, acm->in);
1501 usb_clear_halt(usb_dev, acm->out);
1502 }
1503
1504 return 0;
1505alloc_fail6:
1506 if (acm->country_codes) {
1507 device_remove_file(&acm->control->dev,
1508 &dev_attr_wCountryCodes);
1509 device_remove_file(&acm->control->dev,
1510 &dev_attr_iCountryCodeRelDate);
1511 kfree(acm->country_codes);
1512 }
1513 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1514alloc_fail5:
1515 usb_set_intfdata(intf, NULL);
1516 for (i = 0; i < ACM_NW; i++)
1517 usb_free_urb(acm->wb[i].urb);
1518alloc_fail4:
1519 for (i = 0; i < num_rx_buf; i++)
1520 usb_free_urb(acm->read_urbs[i]);
1521 acm_read_buffers_free(acm);
1522 usb_free_urb(acm->ctrlurb);
1523alloc_fail3:
1524 acm_write_buffers_free(acm);
1525alloc_fail2:
1526 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1527alloc_fail1:
1528 tty_port_put(&acm->port);
1529alloc_fail:
1530 return rv;
1531}
1532
1533static void acm_disconnect(struct usb_interface *intf)
1534{
1535 struct acm *acm = usb_get_intfdata(intf);
1536 struct tty_struct *tty;
1537 int i;
1538
1539 /* sibling interface is already cleaning up */
1540 if (!acm)
1541 return;
1542
1543 mutex_lock(&acm->mutex);
1544 acm->disconnected = true;
1545 if (acm->country_codes) {
1546 device_remove_file(&acm->control->dev,
1547 &dev_attr_wCountryCodes);
1548 device_remove_file(&acm->control->dev,
1549 &dev_attr_iCountryCodeRelDate);
1550 }
1551 wake_up_all(&acm->wioctl);
1552 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1553 usb_set_intfdata(acm->control, NULL);
1554 usb_set_intfdata(acm->data, NULL);
1555 mutex_unlock(&acm->mutex);
1556
1557 tty = tty_port_tty_get(&acm->port);
1558 if (tty) {
1559 tty_vhangup(tty);
1560 tty_kref_put(tty);
1561 }
1562
1563 acm_kill_urbs(acm);
1564 cancel_delayed_work_sync(&acm->dwork);
1565
1566 tty_unregister_device(acm_tty_driver, acm->minor);
1567
1568 usb_free_urb(acm->ctrlurb);
1569 for (i = 0; i < ACM_NW; i++)
1570 usb_free_urb(acm->wb[i].urb);
1571 for (i = 0; i < acm->rx_buflimit; i++)
1572 usb_free_urb(acm->read_urbs[i]);
1573 acm_write_buffers_free(acm);
1574 usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1575 acm_read_buffers_free(acm);
1576
1577 kfree(acm->notification_buffer);
1578
1579 if (!acm->combined_interfaces)
1580 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1581 acm->data : acm->control);
1582
1583 tty_port_put(&acm->port);
1584}
1585
1586#ifdef CONFIG_PM
1587static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1588{
1589 struct acm *acm = usb_get_intfdata(intf);
1590 int cnt;
1591
1592 spin_lock_irq(&acm->write_lock);
1593 if (PMSG_IS_AUTO(message)) {
1594 if (acm->transmitting) {
1595 spin_unlock_irq(&acm->write_lock);
1596 return -EBUSY;
1597 }
1598 }
1599 cnt = acm->susp_count++;
1600 spin_unlock_irq(&acm->write_lock);
1601
1602 if (cnt)
1603 return 0;
1604
1605 acm_kill_urbs(acm);
1606 cancel_delayed_work_sync(&acm->dwork);
1607 acm->urbs_in_error_delay = 0;
1608
1609 return 0;
1610}
1611
1612static int acm_resume(struct usb_interface *intf)
1613{
1614 struct acm *acm = usb_get_intfdata(intf);
1615 struct urb *urb;
1616 int rv = 0;
1617
1618 spin_lock_irq(&acm->write_lock);
1619
1620 if (--acm->susp_count)
1621 goto out;
1622
1623 if (tty_port_initialized(&acm->port)) {
1624 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1625
1626 for (;;) {
1627 urb = usb_get_from_anchor(&acm->delayed);
1628 if (!urb)
1629 break;
1630
1631 acm_start_wb(acm, urb->context);
1632 }
1633
1634 /*
1635 * delayed error checking because we must
1636 * do the write path at all cost
1637 */
1638 if (rv < 0)
1639 goto out;
1640
1641 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1642 }
1643out:
1644 spin_unlock_irq(&acm->write_lock);
1645
1646 return rv;
1647}
1648
1649static int acm_reset_resume(struct usb_interface *intf)
1650{
1651 struct acm *acm = usb_get_intfdata(intf);
1652
1653 if (tty_port_initialized(&acm->port))
1654 tty_port_tty_hangup(&acm->port, false);
1655
1656 return acm_resume(intf);
1657}
1658
1659#endif /* CONFIG_PM */
1660
1661static int acm_pre_reset(struct usb_interface *intf)
1662{
1663 struct acm *acm = usb_get_intfdata(intf);
1664
1665 clear_bit(EVENT_RX_STALL, &acm->flags);
1666 acm->nb_index = 0; /* pending control transfers are lost */
1667
1668 return 0;
1669}
1670
1671#define NOKIA_PCSUITE_ACM_INFO(x) \
1672 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1673 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1674 USB_CDC_ACM_PROTO_VENDOR)
1675
1676#define SAMSUNG_PCSUITE_ACM_INFO(x) \
1677 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1678 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1679 USB_CDC_ACM_PROTO_VENDOR)
1680
1681/*
1682 * USB driver structure.
1683 */
1684
1685static const struct usb_device_id acm_ids[] = {
1686 /* quirky and broken devices */
1687 { USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1688 .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
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(0x045b, 0x023c), /* Renesas USB Download mode */
1697 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1698 },
1699 { USB_DEVICE(0x045b, 0x0248), /* Renesas USB Download mode */
1700 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1701 },
1702 { USB_DEVICE(0x045b, 0x024D), /* Renesas USB Download mode */
1703 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1704 },
1705 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1706 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1707 },
1708 { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1709 .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1710 },
1711 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1712 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1713 },
1714 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1715 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1716 },
1717 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1718 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1719 },
1720 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1721 .driver_info = SINGLE_RX_URB,
1722 },
1723 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1724 .driver_info = SINGLE_RX_URB, /* firmware bug */
1725 },
1726 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1727 .driver_info = SINGLE_RX_URB, /* firmware bug */
1728 },
1729 { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1730 .driver_info = SINGLE_RX_URB,
1731 },
1732 { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1733 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1734 },
1735 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1736 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1737 },
1738 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1739 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1740 },
1741 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1742 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1743 },
1744 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1745 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1746 },
1747 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1748 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1749 },
1750 { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1751 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1752 },
1753 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1754 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1755 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1756 { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1757 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1758 },
1759 /* Motorola H24 HSPA module: */
1760 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1761 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1762 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1763 },
1764 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1765 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1766 },
1767 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1768 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1769 },
1770 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1771 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1772 },
1773 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1774 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1775 },
1776 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1777 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1778 },
1779 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1780 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1781 },
1782
1783 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1784 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1785 data interface instead of
1786 communications interface.
1787 Maybe we should define a new
1788 quirk for this. */
1789 },
1790 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1791 .driver_info = NO_UNION_NORMAL,
1792 },
1793 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1794 .driver_info = NO_UNION_NORMAL,
1795 },
1796 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1797 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1798 },
1799 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1800 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1801 },
1802 { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1803 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1804 },
1805 { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1806 .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1807 },
1808 { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1809 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1810 },
1811
1812 { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1813 .driver_info = CLEAR_HALT_CONDITIONS,
1814 },
1815
1816 /* Nokia S60 phones expose two ACM channels. The first is
1817 * a modem and is picked up by the standard AT-command
1818 * information below. The second is 'vendor-specific' but
1819 * is treated as a serial device at the S60 end, so we want
1820 * to expose it on Linux too. */
1821 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1822 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1823 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1824 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1825 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1826 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1827 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1828 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1829 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1830 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1831 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1832 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1833 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1834 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1835 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1836 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1837 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1838 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1839 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1840 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1841 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1842 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1843 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1844 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1845 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1846 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1847 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1848 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1849 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1850 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1851 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1852 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1853 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1854 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1855 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1856 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1857 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1858 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1859 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1860 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1861 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1862 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1863 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1864 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1865 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1866 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1867 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1868 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1869 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1870 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1871 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1872 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1873 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1874 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1875 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1876 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1877 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1878 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1879
1880 /* Support for Owen devices */
1881 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1882
1883 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1884
1885#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1886 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1887 .driver_info = IGNORE_DEVICE,
1888 },
1889 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1890 .driver_info = IGNORE_DEVICE,
1891 },
1892#endif
1893
1894#if IS_ENABLED(CONFIG_IR_TOY)
1895 { USB_DEVICE(0x04d8, 0xfd08),
1896 .driver_info = IGNORE_DEVICE,
1897 },
1898#endif
1899
1900 /*Samsung phone in firmware update mode */
1901 { USB_DEVICE(0x04e8, 0x685d),
1902 .driver_info = IGNORE_DEVICE,
1903 },
1904
1905 /* Exclude Infineon Flash Loader utility */
1906 { USB_DEVICE(0x058b, 0x0041),
1907 .driver_info = IGNORE_DEVICE,
1908 },
1909
1910 /* Exclude ETAS ES58x */
1911 { USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
1912 .driver_info = IGNORE_DEVICE,
1913 },
1914 { USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
1915 .driver_info = IGNORE_DEVICE,
1916 },
1917 { USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
1918 .driver_info = IGNORE_DEVICE,
1919 },
1920
1921 { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1922 .driver_info = SEND_ZERO_PACKET,
1923 },
1924 { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1925 .driver_info = SEND_ZERO_PACKET,
1926 },
1927
1928 /* control interfaces without any protocol set */
1929 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1930 USB_CDC_PROTO_NONE) },
1931
1932 /* control interfaces with various AT-command sets */
1933 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1934 USB_CDC_ACM_PROTO_AT_V25TER) },
1935 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1936 USB_CDC_ACM_PROTO_AT_PCCA101) },
1937 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1938 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1939 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1940 USB_CDC_ACM_PROTO_AT_GSM) },
1941 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1942 USB_CDC_ACM_PROTO_AT_3G) },
1943 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1944 USB_CDC_ACM_PROTO_AT_CDMA) },
1945
1946 { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1947 .driver_info = SEND_ZERO_PACKET,
1948 },
1949
1950 { }
1951};
1952
1953MODULE_DEVICE_TABLE(usb, acm_ids);
1954
1955static struct usb_driver acm_driver = {
1956 .name = "cdc_acm",
1957 .probe = acm_probe,
1958 .disconnect = acm_disconnect,
1959#ifdef CONFIG_PM
1960 .suspend = acm_suspend,
1961 .resume = acm_resume,
1962 .reset_resume = acm_reset_resume,
1963#endif
1964 .pre_reset = acm_pre_reset,
1965 .id_table = acm_ids,
1966#ifdef CONFIG_PM
1967 .supports_autosuspend = 1,
1968#endif
1969 .disable_hub_initiated_lpm = 1,
1970};
1971
1972/*
1973 * TTY driver structures.
1974 */
1975
1976static const struct tty_operations acm_ops = {
1977 .install = acm_tty_install,
1978 .open = acm_tty_open,
1979 .close = acm_tty_close,
1980 .cleanup = acm_tty_cleanup,
1981 .hangup = acm_tty_hangup,
1982 .write = acm_tty_write,
1983 .write_room = acm_tty_write_room,
1984 .ioctl = acm_tty_ioctl,
1985 .throttle = acm_tty_throttle,
1986 .unthrottle = acm_tty_unthrottle,
1987 .chars_in_buffer = acm_tty_chars_in_buffer,
1988 .break_ctl = acm_tty_break_ctl,
1989 .set_termios = acm_tty_set_termios,
1990 .tiocmget = acm_tty_tiocmget,
1991 .tiocmset = acm_tty_tiocmset,
1992 .get_serial = get_serial_info,
1993 .set_serial = set_serial_info,
1994 .get_icount = acm_tty_get_icount,
1995};
1996
1997/*
1998 * Init / exit.
1999 */
2000
2001static int __init acm_init(void)
2002{
2003 int retval;
2004 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
2005 if (!acm_tty_driver)
2006 return -ENOMEM;
2007 acm_tty_driver->driver_name = "acm",
2008 acm_tty_driver->name = "ttyACM",
2009 acm_tty_driver->major = ACM_TTY_MAJOR,
2010 acm_tty_driver->minor_start = 0,
2011 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2012 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2013 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2014 acm_tty_driver->init_termios = tty_std_termios;
2015 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2016 HUPCL | CLOCAL;
2017 tty_set_operations(acm_tty_driver, &acm_ops);
2018
2019 retval = tty_register_driver(acm_tty_driver);
2020 if (retval) {
2021 put_tty_driver(acm_tty_driver);
2022 return retval;
2023 }
2024
2025 retval = usb_register(&acm_driver);
2026 if (retval) {
2027 tty_unregister_driver(acm_tty_driver);
2028 put_tty_driver(acm_tty_driver);
2029 return retval;
2030 }
2031
2032 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2033
2034 return 0;
2035}
2036
2037static void __exit acm_exit(void)
2038{
2039 usb_deregister(&acm_driver);
2040 tty_unregister_driver(acm_tty_driver);
2041 put_tty_driver(acm_tty_driver);
2042 idr_destroy(&acm_minors);
2043}
2044
2045module_init(acm_init);
2046module_exit(acm_exit);
2047
2048MODULE_AUTHOR(DRIVER_AUTHOR);
2049MODULE_DESCRIPTION(DRIVER_DESC);
2050MODULE_LICENSE("GPL");
2051MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
Linux 6.x block layer and io_uring tree(s)