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
47 static struct usb_driver acm_driver;
48 static struct tty_driver *acm_tty_driver;
49
50 static DEFINE_IDR(acm_minors);
51 static DEFINE_MUTEX(acm_minors_lock);
52
53 static 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 */
acm_get_by_minor(unsigned int minor)64 static 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 */
acm_alloc_minor(struct acm * acm)87 static 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'. */
acm_release_minor(struct acm * acm)99 static 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
acm_ctrl_msg(struct acm * acm,int request,int value,void * buf,int len)110 static 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 */
acm_set_control(struct acm * acm,int control)136 static 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
acm_kill_urbs(struct acm * acm)150 static 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
acm_wb_alloc(struct acm * acm)166 static int acm_wb_alloc(struct acm *acm)
167 {
168 int i, wbn;
169 struct acm_wb *wb;
170
171 wbn = 0;
172 i = 0;
173 for (;;) {
174 wb = &acm->wb[wbn];
175 if (!wb->use) {
176 wb->use = 1;
177 wb->len = 0;
178 return wbn;
179 }
180 wbn = (wbn + 1) % ACM_NW;
181 if (++i >= ACM_NW)
182 return -1;
183 }
184 }
185
acm_wb_is_avail(struct acm * acm)186 static int acm_wb_is_avail(struct acm *acm)
187 {
188 int i, n;
189 unsigned long flags;
190
191 n = ACM_NW;
192 spin_lock_irqsave(&acm->write_lock, flags);
193 for (i = 0; i < ACM_NW; i++)
194 n -= acm->wb[i].use;
195 spin_unlock_irqrestore(&acm->write_lock, flags);
196 return n;
197 }
198
199 /*
200 * Finish write. Caller must hold acm->write_lock
201 */
acm_write_done(struct acm * acm,struct acm_wb * wb)202 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
203 {
204 wb->use = 0;
205 acm->transmitting--;
206 usb_autopm_put_interface_async(acm->control);
207 }
208
209 /*
210 * Poke write.
211 *
212 * the caller is responsible for locking
213 */
214
acm_start_wb(struct acm * acm,struct acm_wb * wb)215 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
216 {
217 int rc;
218
219 acm->transmitting++;
220
221 wb->urb->transfer_buffer = wb->buf;
222 wb->urb->transfer_dma = wb->dmah;
223 wb->urb->transfer_buffer_length = wb->len;
224 wb->urb->dev = acm->dev;
225
226 rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
227 if (rc < 0) {
228 dev_err(&acm->data->dev,
229 "%s - usb_submit_urb(write bulk) failed: %d\n",
230 __func__, rc);
231 acm_write_done(acm, wb);
232 }
233 return rc;
234 }
235
236 /*
237 * attributes exported through sysfs
238 */
bmCapabilities_show(struct device * dev,struct device_attribute * attr,char * buf)239 static ssize_t bmCapabilities_show
240 (struct device *dev, struct device_attribute *attr, char *buf)
241 {
242 struct usb_interface *intf = to_usb_interface(dev);
243 struct acm *acm = usb_get_intfdata(intf);
244
245 return sprintf(buf, "%d", acm->ctrl_caps);
246 }
247 static DEVICE_ATTR_RO(bmCapabilities);
248
wCountryCodes_show(struct device * dev,struct device_attribute * attr,char * buf)249 static ssize_t wCountryCodes_show
250 (struct device *dev, struct device_attribute *attr, char *buf)
251 {
252 struct usb_interface *intf = to_usb_interface(dev);
253 struct acm *acm = usb_get_intfdata(intf);
254
255 memcpy(buf, acm->country_codes, acm->country_code_size);
256 return acm->country_code_size;
257 }
258
259 static DEVICE_ATTR_RO(wCountryCodes);
260
iCountryCodeRelDate_show(struct device * dev,struct device_attribute * attr,char * buf)261 static ssize_t iCountryCodeRelDate_show
262 (struct device *dev, struct device_attribute *attr, char *buf)
263 {
264 struct usb_interface *intf = to_usb_interface(dev);
265 struct acm *acm = usb_get_intfdata(intf);
266
267 return sprintf(buf, "%d", acm->country_rel_date);
268 }
269
270 static DEVICE_ATTR_RO(iCountryCodeRelDate);
271 /*
272 * Interrupt handlers for various ACM device responses
273 */
274
acm_process_notification(struct acm * acm,unsigned char * buf)275 static void acm_process_notification(struct acm *acm, unsigned char *buf)
276 {
277 int newctrl;
278 int difference;
279 unsigned long flags;
280 struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
281 unsigned char *data = buf + sizeof(struct usb_cdc_notification);
282
283 switch (dr->bNotificationType) {
284 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
285 dev_dbg(&acm->control->dev,
286 "%s - network connection: %d\n", __func__, dr->wValue);
287 break;
288
289 case USB_CDC_NOTIFY_SERIAL_STATE:
290 if (le16_to_cpu(dr->wLength) != 2) {
291 dev_dbg(&acm->control->dev,
292 "%s - malformed serial state\n", __func__);
293 break;
294 }
295
296 newctrl = get_unaligned_le16(data);
297 dev_dbg(&acm->control->dev,
298 "%s - serial state: 0x%x\n", __func__, newctrl);
299
300 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
301 dev_dbg(&acm->control->dev,
302 "%s - calling hangup\n", __func__);
303 tty_port_tty_hangup(&acm->port, false);
304 }
305
306 difference = acm->ctrlin ^ newctrl;
307 spin_lock_irqsave(&acm->read_lock, flags);
308 acm->ctrlin = newctrl;
309 acm->oldcount = acm->iocount;
310
311 if (difference & ACM_CTRL_DSR)
312 acm->iocount.dsr++;
313 if (difference & ACM_CTRL_DCD)
314 acm->iocount.dcd++;
315 if (newctrl & ACM_CTRL_BRK)
316 acm->iocount.brk++;
317 if (newctrl & ACM_CTRL_RI)
318 acm->iocount.rng++;
319 if (newctrl & ACM_CTRL_FRAMING)
320 acm->iocount.frame++;
321 if (newctrl & ACM_CTRL_PARITY)
322 acm->iocount.parity++;
323 if (newctrl & ACM_CTRL_OVERRUN)
324 acm->iocount.overrun++;
325 spin_unlock_irqrestore(&acm->read_lock, flags);
326
327 if (difference)
328 wake_up_all(&acm->wioctl);
329
330 break;
331
332 default:
333 dev_dbg(&acm->control->dev,
334 "%s - unknown notification %d received: index %d len %d\n",
335 __func__,
336 dr->bNotificationType, dr->wIndex, dr->wLength);
337 }
338 }
339
340 /* control interface reports status changes with "interrupt" transfers */
acm_ctrl_irq(struct urb * urb)341 static void acm_ctrl_irq(struct urb *urb)
342 {
343 struct acm *acm = urb->context;
344 struct usb_cdc_notification *dr = urb->transfer_buffer;
345 unsigned int current_size = urb->actual_length;
346 unsigned int expected_size, copy_size, alloc_size;
347 int retval;
348 int status = urb->status;
349
350 switch (status) {
351 case 0:
352 /* success */
353 break;
354 case -ECONNRESET:
355 case -ENOENT:
356 case -ESHUTDOWN:
357 /* this urb is terminated, clean up */
358 dev_dbg(&acm->control->dev,
359 "%s - urb shutting down with status: %d\n",
360 __func__, status);
361 return;
362 default:
363 dev_dbg(&acm->control->dev,
364 "%s - nonzero urb status received: %d\n",
365 __func__, status);
366 goto exit;
367 }
368
369 usb_mark_last_busy(acm->dev);
370
371 if (acm->nb_index)
372 dr = (struct usb_cdc_notification *)acm->notification_buffer;
373
374 /* size = notification-header + (optional) data */
375 expected_size = sizeof(struct usb_cdc_notification) +
376 le16_to_cpu(dr->wLength);
377
378 if (current_size < expected_size) {
379 /* notification is transmitted fragmented, reassemble */
380 if (acm->nb_size < expected_size) {
381 u8 *new_buffer;
382 alloc_size = roundup_pow_of_two(expected_size);
383 /* Final freeing is done on disconnect. */
384 new_buffer = krealloc(acm->notification_buffer,
385 alloc_size, GFP_ATOMIC);
386 if (!new_buffer) {
387 acm->nb_index = 0;
388 goto exit;
389 }
390
391 acm->notification_buffer = new_buffer;
392 acm->nb_size = alloc_size;
393 dr = (struct usb_cdc_notification *)acm->notification_buffer;
394 }
395
396 copy_size = min(current_size,
397 expected_size - acm->nb_index);
398
399 memcpy(&acm->notification_buffer[acm->nb_index],
400 urb->transfer_buffer, copy_size);
401 acm->nb_index += copy_size;
402 current_size = acm->nb_index;
403 }
404
405 if (current_size >= expected_size) {
406 /* notification complete */
407 acm_process_notification(acm, (unsigned char *)dr);
408 acm->nb_index = 0;
409 }
410
411 exit:
412 retval = usb_submit_urb(urb, GFP_ATOMIC);
413 if (retval && retval != -EPERM && retval != -ENODEV)
414 dev_err(&acm->control->dev,
415 "%s - usb_submit_urb failed: %d\n", __func__, retval);
416 else
417 dev_vdbg(&acm->control->dev,
418 "control resubmission terminated %d\n", retval);
419 }
420
acm_submit_read_urb(struct acm * acm,int index,gfp_t mem_flags)421 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
422 {
423 int res;
424
425 if (!test_and_clear_bit(index, &acm->read_urbs_free))
426 return 0;
427
428 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
429 if (res) {
430 if (res != -EPERM && res != -ENODEV) {
431 dev_err(&acm->data->dev,
432 "urb %d failed submission with %d\n",
433 index, res);
434 } else {
435 dev_vdbg(&acm->data->dev, "intended failure %d\n", res);
436 }
437 set_bit(index, &acm->read_urbs_free);
438 return res;
439 } else {
440 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
441 }
442
443 return 0;
444 }
445
acm_submit_read_urbs(struct acm * acm,gfp_t mem_flags)446 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
447 {
448 int res;
449 int i;
450
451 for (i = 0; i < acm->rx_buflimit; ++i) {
452 res = acm_submit_read_urb(acm, i, mem_flags);
453 if (res)
454 return res;
455 }
456
457 return 0;
458 }
459
acm_process_read_urb(struct acm * acm,struct urb * urb)460 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
461 {
462 if (!urb->actual_length)
463 return;
464
465 tty_insert_flip_string(&acm->port, urb->transfer_buffer,
466 urb->actual_length);
467 tty_flip_buffer_push(&acm->port);
468 }
469
acm_read_bulk_callback(struct urb * urb)470 static void acm_read_bulk_callback(struct urb *urb)
471 {
472 struct acm_rb *rb = urb->context;
473 struct acm *acm = rb->instance;
474 unsigned long flags;
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 /* throttle device if requested by tty */
544 spin_lock_irqsave(&acm->read_lock, flags);
545 acm->throttled = acm->throttle_req;
546 if (!acm->throttled) {
547 spin_unlock_irqrestore(&acm->read_lock, flags);
548 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
549 } else {
550 spin_unlock_irqrestore(&acm->read_lock, flags);
551 }
552 }
553
554 /* data interface wrote those outgoing bytes */
acm_write_bulk(struct urb * urb)555 static void acm_write_bulk(struct urb *urb)
556 {
557 struct acm_wb *wb = urb->context;
558 struct acm *acm = wb->instance;
559 unsigned long flags;
560 int status = urb->status;
561
562 if (status || (urb->actual_length != urb->transfer_buffer_length))
563 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
564 urb->actual_length,
565 urb->transfer_buffer_length,
566 status);
567
568 spin_lock_irqsave(&acm->write_lock, flags);
569 acm_write_done(acm, wb);
570 spin_unlock_irqrestore(&acm->write_lock, flags);
571 set_bit(EVENT_TTY_WAKEUP, &acm->flags);
572 schedule_delayed_work(&acm->dwork, 0);
573 }
574
acm_softint(struct work_struct * work)575 static void acm_softint(struct work_struct *work)
576 {
577 int i;
578 struct acm *acm = container_of(work, struct acm, dwork.work);
579
580 if (test_bit(EVENT_RX_STALL, &acm->flags)) {
581 smp_mb(); /* against acm_suspend() */
582 if (!acm->susp_count) {
583 for (i = 0; i < acm->rx_buflimit; i++)
584 usb_kill_urb(acm->read_urbs[i]);
585 usb_clear_halt(acm->dev, acm->in);
586 acm_submit_read_urbs(acm, GFP_KERNEL);
587 clear_bit(EVENT_RX_STALL, &acm->flags);
588 }
589 }
590
591 if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
592 for (i = 0; i < acm->rx_buflimit; i++)
593 if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
594 acm_submit_read_urb(acm, i, GFP_KERNEL);
595 }
596
597 if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
598 tty_port_tty_wakeup(&acm->port);
599 }
600
601 /*
602 * TTY handlers
603 */
604
acm_tty_install(struct tty_driver * driver,struct tty_struct * tty)605 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
606 {
607 struct acm *acm;
608 int retval;
609
610 acm = acm_get_by_minor(tty->index);
611 if (!acm)
612 return -ENODEV;
613
614 retval = tty_standard_install(driver, tty);
615 if (retval)
616 goto error_init_termios;
617
618 /*
619 * Suppress initial echoing for some devices which might send data
620 * immediately after acm driver has been installed.
621 */
622 if (acm->quirks & DISABLE_ECHO)
623 tty->termios.c_lflag &= ~ECHO;
624
625 tty->driver_data = acm;
626
627 return 0;
628
629 error_init_termios:
630 tty_port_put(&acm->port);
631 return retval;
632 }
633
acm_tty_open(struct tty_struct * tty,struct file * filp)634 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
635 {
636 struct acm *acm = tty->driver_data;
637
638 return tty_port_open(&acm->port, tty, filp);
639 }
640
acm_port_dtr_rts(struct tty_port * port,int raise)641 static void acm_port_dtr_rts(struct tty_port *port, int raise)
642 {
643 struct acm *acm = container_of(port, struct acm, port);
644 int val;
645 int res;
646
647 if (raise)
648 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
649 else
650 val = 0;
651
652 /* FIXME: add missing ctrlout locking throughout driver */
653 acm->ctrlout = val;
654
655 res = acm_set_control(acm, val);
656 if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
657 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
658 }
659
acm_port_activate(struct tty_port * port,struct tty_struct * tty)660 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
661 {
662 struct acm *acm = container_of(port, struct acm, port);
663 int retval = -ENODEV;
664 int i;
665
666 mutex_lock(&acm->mutex);
667 if (acm->disconnected)
668 goto disconnected;
669
670 retval = usb_autopm_get_interface(acm->control);
671 if (retval)
672 goto error_get_interface;
673
674 /*
675 * FIXME: Why do we need this? Allocating 64K of physically contiguous
676 * memory is really nasty...
677 */
678 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
679 acm->control->needs_remote_wakeup = 1;
680
681 acm->ctrlurb->dev = acm->dev;
682 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
683 if (retval) {
684 dev_err(&acm->control->dev,
685 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
686 goto error_submit_urb;
687 }
688
689 acm_tty_set_termios(tty, NULL);
690
691 /*
692 * Unthrottle device in case the TTY was closed while throttled.
693 */
694 spin_lock_irq(&acm->read_lock);
695 acm->throttled = 0;
696 acm->throttle_req = 0;
697 spin_unlock_irq(&acm->read_lock);
698
699 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
700 if (retval)
701 goto error_submit_read_urbs;
702
703 usb_autopm_put_interface(acm->control);
704
705 mutex_unlock(&acm->mutex);
706
707 return 0;
708
709 error_submit_read_urbs:
710 for (i = 0; i < acm->rx_buflimit; i++)
711 usb_kill_urb(acm->read_urbs[i]);
712 usb_kill_urb(acm->ctrlurb);
713 error_submit_urb:
714 usb_autopm_put_interface(acm->control);
715 error_get_interface:
716 disconnected:
717 mutex_unlock(&acm->mutex);
718
719 return usb_translate_errors(retval);
720 }
721
acm_port_destruct(struct tty_port * port)722 static void acm_port_destruct(struct tty_port *port)
723 {
724 struct acm *acm = container_of(port, struct acm, port);
725
726 acm_release_minor(acm);
727 usb_put_intf(acm->control);
728 kfree(acm->country_codes);
729 kfree(acm);
730 }
731
acm_port_shutdown(struct tty_port * port)732 static void acm_port_shutdown(struct tty_port *port)
733 {
734 struct acm *acm = container_of(port, struct acm, port);
735 struct urb *urb;
736 struct acm_wb *wb;
737
738 /*
739 * Need to grab write_lock to prevent race with resume, but no need to
740 * hold it due to the tty-port initialised flag.
741 */
742 spin_lock_irq(&acm->write_lock);
743 spin_unlock_irq(&acm->write_lock);
744
745 usb_autopm_get_interface_no_resume(acm->control);
746 acm->control->needs_remote_wakeup = 0;
747 usb_autopm_put_interface(acm->control);
748
749 for (;;) {
750 urb = usb_get_from_anchor(&acm->delayed);
751 if (!urb)
752 break;
753 wb = urb->context;
754 wb->use = 0;
755 usb_autopm_put_interface_async(acm->control);
756 }
757
758 acm_kill_urbs(acm);
759 }
760
acm_tty_cleanup(struct tty_struct * tty)761 static void acm_tty_cleanup(struct tty_struct *tty)
762 {
763 struct acm *acm = tty->driver_data;
764
765 tty_port_put(&acm->port);
766 }
767
acm_tty_hangup(struct tty_struct * tty)768 static void acm_tty_hangup(struct tty_struct *tty)
769 {
770 struct acm *acm = tty->driver_data;
771
772 tty_port_hangup(&acm->port);
773 }
774
acm_tty_close(struct tty_struct * tty,struct file * filp)775 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
776 {
777 struct acm *acm = tty->driver_data;
778
779 tty_port_close(&acm->port, tty, filp);
780 }
781
acm_tty_write(struct tty_struct * tty,const unsigned char * buf,int count)782 static int acm_tty_write(struct tty_struct *tty,
783 const unsigned char *buf, int count)
784 {
785 struct acm *acm = tty->driver_data;
786 int stat;
787 unsigned long flags;
788 int wbn;
789 struct acm_wb *wb;
790
791 if (!count)
792 return 0;
793
794 dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
795
796 spin_lock_irqsave(&acm->write_lock, flags);
797 wbn = acm_wb_alloc(acm);
798 if (wbn < 0) {
799 spin_unlock_irqrestore(&acm->write_lock, flags);
800 return 0;
801 }
802 wb = &acm->wb[wbn];
803
804 if (!acm->dev) {
805 wb->use = 0;
806 spin_unlock_irqrestore(&acm->write_lock, flags);
807 return -ENODEV;
808 }
809
810 count = (count > acm->writesize) ? acm->writesize : count;
811 dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
812 memcpy(wb->buf, buf, count);
813 wb->len = count;
814
815 stat = usb_autopm_get_interface_async(acm->control);
816 if (stat) {
817 wb->use = 0;
818 spin_unlock_irqrestore(&acm->write_lock, flags);
819 return stat;
820 }
821
822 if (acm->susp_count) {
823 usb_anchor_urb(wb->urb, &acm->delayed);
824 spin_unlock_irqrestore(&acm->write_lock, flags);
825 return count;
826 }
827
828 stat = acm_start_wb(acm, wb);
829 spin_unlock_irqrestore(&acm->write_lock, flags);
830
831 if (stat < 0)
832 return stat;
833 return count;
834 }
835
acm_tty_write_room(struct tty_struct * tty)836 static int acm_tty_write_room(struct tty_struct *tty)
837 {
838 struct acm *acm = tty->driver_data;
839 /*
840 * Do not let the line discipline to know that we have a reserve,
841 * or it might get too enthusiastic.
842 */
843 return acm_wb_is_avail(acm) ? acm->writesize : 0;
844 }
845
acm_tty_chars_in_buffer(struct tty_struct * tty)846 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
847 {
848 struct acm *acm = tty->driver_data;
849 /*
850 * if the device was unplugged then any remaining characters fell out
851 * of the connector ;)
852 */
853 if (acm->disconnected)
854 return 0;
855 /*
856 * This is inaccurate (overcounts), but it works.
857 */
858 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
859 }
860
acm_tty_throttle(struct tty_struct * tty)861 static void acm_tty_throttle(struct tty_struct *tty)
862 {
863 struct acm *acm = tty->driver_data;
864
865 spin_lock_irq(&acm->read_lock);
866 acm->throttle_req = 1;
867 spin_unlock_irq(&acm->read_lock);
868 }
869
acm_tty_unthrottle(struct tty_struct * tty)870 static void acm_tty_unthrottle(struct tty_struct *tty)
871 {
872 struct acm *acm = tty->driver_data;
873 unsigned int was_throttled;
874
875 spin_lock_irq(&acm->read_lock);
876 was_throttled = acm->throttled;
877 acm->throttled = 0;
878 acm->throttle_req = 0;
879 spin_unlock_irq(&acm->read_lock);
880
881 /* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
882 smp_mb();
883
884 if (was_throttled)
885 acm_submit_read_urbs(acm, GFP_KERNEL);
886 }
887
acm_tty_break_ctl(struct tty_struct * tty,int state)888 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
889 {
890 struct acm *acm = tty->driver_data;
891 int retval;
892
893 retval = acm_send_break(acm, state ? 0xffff : 0);
894 if (retval < 0)
895 dev_dbg(&acm->control->dev,
896 "%s - send break failed\n", __func__);
897 return retval;
898 }
899
acm_tty_tiocmget(struct tty_struct * tty)900 static int acm_tty_tiocmget(struct tty_struct *tty)
901 {
902 struct acm *acm = tty->driver_data;
903
904 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
905 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
906 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
907 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
908 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
909 TIOCM_CTS;
910 }
911
acm_tty_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)912 static int acm_tty_tiocmset(struct tty_struct *tty,
913 unsigned int set, unsigned int clear)
914 {
915 struct acm *acm = tty->driver_data;
916 unsigned int newctrl;
917
918 newctrl = acm->ctrlout;
919 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
920 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
921 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
922 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
923
924 newctrl = (newctrl & ~clear) | set;
925
926 if (acm->ctrlout == newctrl)
927 return 0;
928 return acm_set_control(acm, acm->ctrlout = newctrl);
929 }
930
get_serial_info(struct acm * acm,struct serial_struct __user * info)931 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
932 {
933 struct serial_struct tmp;
934
935 memset(&tmp, 0, sizeof(tmp));
936 tmp.xmit_fifo_size = acm->writesize;
937 tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
938 tmp.close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
939 tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
940 ASYNC_CLOSING_WAIT_NONE :
941 jiffies_to_msecs(acm->port.closing_wait) / 10;
942
943 if (copy_to_user(info, &tmp, sizeof(tmp)))
944 return -EFAULT;
945 else
946 return 0;
947 }
948
set_serial_info(struct acm * acm,struct serial_struct __user * newinfo)949 static int set_serial_info(struct acm *acm,
950 struct serial_struct __user *newinfo)
951 {
952 struct serial_struct new_serial;
953 unsigned int closing_wait, close_delay;
954 unsigned int old_closing_wait, old_close_delay;
955 int retval = 0;
956
957 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
958 return -EFAULT;
959
960 close_delay = msecs_to_jiffies(new_serial.close_delay * 10);
961 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
962 ASYNC_CLOSING_WAIT_NONE :
963 msecs_to_jiffies(new_serial.closing_wait * 10);
964
965 /* we must redo the rounding here, so that the values match */
966 old_close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
967 old_closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
968 ASYNC_CLOSING_WAIT_NONE :
969 jiffies_to_msecs(acm->port.closing_wait) / 10;
970
971 mutex_lock(&acm->port.mutex);
972
973 if (!capable(CAP_SYS_ADMIN)) {
974 if ((new_serial.close_delay != old_close_delay) ||
975 (new_serial.closing_wait != old_closing_wait))
976 retval = -EPERM;
977 else
978 retval = -EOPNOTSUPP;
979 } else {
980 acm->port.close_delay = close_delay;
981 acm->port.closing_wait = closing_wait;
982 }
983
984 mutex_unlock(&acm->port.mutex);
985 return retval;
986 }
987
wait_serial_change(struct acm * acm,unsigned long arg)988 static int wait_serial_change(struct acm *acm, unsigned long arg)
989 {
990 int rv = 0;
991 DECLARE_WAITQUEUE(wait, current);
992 struct async_icount old, new;
993
994 do {
995 spin_lock_irq(&acm->read_lock);
996 old = acm->oldcount;
997 new = acm->iocount;
998 acm->oldcount = new;
999 spin_unlock_irq(&acm->read_lock);
1000
1001 if ((arg & TIOCM_DSR) &&
1002 old.dsr != new.dsr)
1003 break;
1004 if ((arg & TIOCM_CD) &&
1005 old.dcd != new.dcd)
1006 break;
1007 if ((arg & TIOCM_RI) &&
1008 old.rng != new.rng)
1009 break;
1010
1011 add_wait_queue(&acm->wioctl, &wait);
1012 set_current_state(TASK_INTERRUPTIBLE);
1013 schedule();
1014 remove_wait_queue(&acm->wioctl, &wait);
1015 if (acm->disconnected) {
1016 if (arg & TIOCM_CD)
1017 break;
1018 else
1019 rv = -ENODEV;
1020 } else {
1021 if (signal_pending(current))
1022 rv = -ERESTARTSYS;
1023 }
1024 } while (!rv);
1025
1026
1027
1028 return rv;
1029 }
1030
acm_tty_get_icount(struct tty_struct * tty,struct serial_icounter_struct * icount)1031 static int acm_tty_get_icount(struct tty_struct *tty,
1032 struct serial_icounter_struct *icount)
1033 {
1034 struct acm *acm = tty->driver_data;
1035
1036 icount->dsr = acm->iocount.dsr;
1037 icount->rng = acm->iocount.rng;
1038 icount->dcd = acm->iocount.dcd;
1039 icount->frame = acm->iocount.frame;
1040 icount->overrun = acm->iocount.overrun;
1041 icount->parity = acm->iocount.parity;
1042 icount->brk = acm->iocount.brk;
1043
1044 return 0;
1045 }
1046
acm_tty_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1047 static int acm_tty_ioctl(struct tty_struct *tty,
1048 unsigned int cmd, unsigned long arg)
1049 {
1050 struct acm *acm = tty->driver_data;
1051 int rv = -ENOIOCTLCMD;
1052
1053 switch (cmd) {
1054 case TIOCGSERIAL: /* gets serial port data */
1055 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
1056 break;
1057 case TIOCSSERIAL:
1058 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
1059 break;
1060 case TIOCMIWAIT:
1061 rv = usb_autopm_get_interface(acm->control);
1062 if (rv < 0) {
1063 rv = -EIO;
1064 break;
1065 }
1066 rv = wait_serial_change(acm, arg);
1067 usb_autopm_put_interface(acm->control);
1068 break;
1069 }
1070
1071 return rv;
1072 }
1073
acm_tty_set_termios(struct tty_struct * tty,struct ktermios * termios_old)1074 static void acm_tty_set_termios(struct tty_struct *tty,
1075 struct ktermios *termios_old)
1076 {
1077 struct acm *acm = tty->driver_data;
1078 struct ktermios *termios = &tty->termios;
1079 struct usb_cdc_line_coding newline;
1080 int newctrl = acm->ctrlout;
1081
1082 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1083 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1084 newline.bParityType = termios->c_cflag & PARENB ?
1085 (termios->c_cflag & PARODD ? 1 : 2) +
1086 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1087 switch (termios->c_cflag & CSIZE) {
1088 case CS5:
1089 newline.bDataBits = 5;
1090 break;
1091 case CS6:
1092 newline.bDataBits = 6;
1093 break;
1094 case CS7:
1095 newline.bDataBits = 7;
1096 break;
1097 case CS8:
1098 default:
1099 newline.bDataBits = 8;
1100 break;
1101 }
1102 /* FIXME: Needs to clear unsupported bits in the termios */
1103 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1104
1105 if (C_BAUD(tty) == B0) {
1106 newline.dwDTERate = acm->line.dwDTERate;
1107 newctrl &= ~ACM_CTRL_DTR;
1108 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1109 newctrl |= ACM_CTRL_DTR;
1110 }
1111
1112 if (newctrl != acm->ctrlout)
1113 acm_set_control(acm, acm->ctrlout = newctrl);
1114
1115 if (memcmp(&acm->line, &newline, sizeof newline)) {
1116 memcpy(&acm->line, &newline, sizeof newline);
1117 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1118 __func__,
1119 le32_to_cpu(newline.dwDTERate),
1120 newline.bCharFormat, newline.bParityType,
1121 newline.bDataBits);
1122 acm_set_line(acm, &acm->line);
1123 }
1124 }
1125
1126 static const struct tty_port_operations acm_port_ops = {
1127 .dtr_rts = acm_port_dtr_rts,
1128 .shutdown = acm_port_shutdown,
1129 .activate = acm_port_activate,
1130 .destruct = acm_port_destruct,
1131 };
1132
1133 /*
1134 * USB probe and disconnect routines.
1135 */
1136
1137 /* Little helpers: write/read buffers free */
acm_write_buffers_free(struct acm * acm)1138 static void acm_write_buffers_free(struct acm *acm)
1139 {
1140 int i;
1141 struct acm_wb *wb;
1142
1143 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1144 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1145 }
1146
acm_read_buffers_free(struct acm * acm)1147 static void acm_read_buffers_free(struct acm *acm)
1148 {
1149 int i;
1150
1151 for (i = 0; i < acm->rx_buflimit; i++)
1152 usb_free_coherent(acm->dev, acm->readsize,
1153 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1154 }
1155
1156 /* Little helper: write buffers allocate */
acm_write_buffers_alloc(struct acm * acm)1157 static int acm_write_buffers_alloc(struct acm *acm)
1158 {
1159 int i;
1160 struct acm_wb *wb;
1161
1162 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1163 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1164 &wb->dmah);
1165 if (!wb->buf) {
1166 while (i != 0) {
1167 --i;
1168 --wb;
1169 usb_free_coherent(acm->dev, acm->writesize,
1170 wb->buf, wb->dmah);
1171 }
1172 return -ENOMEM;
1173 }
1174 }
1175 return 0;
1176 }
1177
acm_probe(struct usb_interface * intf,const struct usb_device_id * id)1178 static int acm_probe(struct usb_interface *intf,
1179 const struct usb_device_id *id)
1180 {
1181 struct usb_cdc_union_desc *union_header = NULL;
1182 struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1183 unsigned char *buffer = intf->altsetting->extra;
1184 int buflen = intf->altsetting->extralen;
1185 struct usb_interface *control_interface;
1186 struct usb_interface *data_interface;
1187 struct usb_endpoint_descriptor *epctrl = NULL;
1188 struct usb_endpoint_descriptor *epread = NULL;
1189 struct usb_endpoint_descriptor *epwrite = NULL;
1190 struct usb_device *usb_dev = interface_to_usbdev(intf);
1191 struct usb_cdc_parsed_header h;
1192 struct acm *acm;
1193 int minor;
1194 int ctrlsize, readsize;
1195 u8 *buf;
1196 int call_intf_num = -1;
1197 int data_intf_num = -1;
1198 unsigned long quirks;
1199 int num_rx_buf;
1200 int i;
1201 int combined_interfaces = 0;
1202 struct device *tty_dev;
1203 int rv = -ENOMEM;
1204 int res;
1205
1206 /* normal quirks */
1207 quirks = (unsigned long)id->driver_info;
1208
1209 if (quirks == IGNORE_DEVICE)
1210 return -ENODEV;
1211
1212 memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1213
1214 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1215
1216 /* handle quirks deadly to normal probing*/
1217 if (quirks == NO_UNION_NORMAL) {
1218 data_interface = usb_ifnum_to_if(usb_dev, 1);
1219 control_interface = usb_ifnum_to_if(usb_dev, 0);
1220 /* we would crash */
1221 if (!data_interface || !control_interface)
1222 return -ENODEV;
1223 goto skip_normal_probe;
1224 }
1225
1226 /* normal probing*/
1227 if (!buffer) {
1228 dev_err(&intf->dev, "Weird descriptor references\n");
1229 return -EINVAL;
1230 }
1231
1232 if (!intf->cur_altsetting)
1233 return -EINVAL;
1234
1235 if (!buflen) {
1236 if (intf->cur_altsetting->endpoint &&
1237 intf->cur_altsetting->endpoint->extralen &&
1238 intf->cur_altsetting->endpoint->extra) {
1239 dev_dbg(&intf->dev,
1240 "Seeking extra descriptors on endpoint\n");
1241 buflen = intf->cur_altsetting->endpoint->extralen;
1242 buffer = intf->cur_altsetting->endpoint->extra;
1243 } else {
1244 dev_err(&intf->dev,
1245 "Zero length descriptor references\n");
1246 return -EINVAL;
1247 }
1248 }
1249
1250 cdc_parse_cdc_header(&h, intf, buffer, buflen);
1251 union_header = h.usb_cdc_union_desc;
1252 cmgmd = h.usb_cdc_call_mgmt_descriptor;
1253 if (cmgmd)
1254 call_intf_num = cmgmd->bDataInterface;
1255
1256 if (!union_header) {
1257 if (call_intf_num > 0) {
1258 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1259 /* quirks for Droids MuIn LCD */
1260 if (quirks & NO_DATA_INTERFACE) {
1261 data_interface = usb_ifnum_to_if(usb_dev, 0);
1262 } else {
1263 data_intf_num = call_intf_num;
1264 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1265 }
1266 control_interface = intf;
1267 } else {
1268 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1269 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1270 return -ENODEV;
1271 } else {
1272 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1273 combined_interfaces = 1;
1274 control_interface = data_interface = intf;
1275 goto look_for_collapsed_interface;
1276 }
1277 }
1278 } else {
1279 int class = -1;
1280
1281 data_intf_num = union_header->bSlaveInterface0;
1282 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1283 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1284
1285 if (control_interface)
1286 class = control_interface->cur_altsetting->desc.bInterfaceClass;
1287
1288 if (class != USB_CLASS_COMM && class != USB_CLASS_CDC_DATA) {
1289 dev_dbg(&intf->dev, "Broken union descriptor, assuming single interface\n");
1290 combined_interfaces = 1;
1291 control_interface = data_interface = intf;
1292 goto look_for_collapsed_interface;
1293 }
1294 }
1295
1296 if (!control_interface || !data_interface) {
1297 dev_dbg(&intf->dev, "no interfaces\n");
1298 return -ENODEV;
1299 }
1300 if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1301 return -ENODEV;
1302
1303 if (data_intf_num != call_intf_num)
1304 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1305
1306 if (control_interface == data_interface) {
1307 /* some broken devices designed for windows work this way */
1308 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1309 combined_interfaces = 1;
1310 /* a popular other OS doesn't use it */
1311 quirks |= NO_CAP_LINE;
1312 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1313 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1314 return -EINVAL;
1315 }
1316 look_for_collapsed_interface:
1317 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1318 &epread, &epwrite, &epctrl, NULL);
1319 if (res)
1320 return res;
1321
1322 goto made_compressed_probe;
1323 }
1324
1325 skip_normal_probe:
1326
1327 /*workaround for switched interfaces */
1328 if (data_interface->cur_altsetting->desc.bInterfaceClass
1329 != CDC_DATA_INTERFACE_TYPE) {
1330 if (control_interface->cur_altsetting->desc.bInterfaceClass
1331 == CDC_DATA_INTERFACE_TYPE) {
1332 dev_dbg(&intf->dev,
1333 "Your device has switched interfaces.\n");
1334 swap(control_interface, data_interface);
1335 } else {
1336 return -EINVAL;
1337 }
1338 }
1339
1340 /* Accept probe requests only for the control interface */
1341 if (!combined_interfaces && intf != control_interface)
1342 return -ENODEV;
1343
1344 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1345 /* valid in this context */
1346 dev_dbg(&intf->dev, "The data interface isn't available\n");
1347 return -EBUSY;
1348 }
1349
1350
1351 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1352 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1353 return -EINVAL;
1354
1355 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1356 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1357 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1358
1359
1360 /* workaround for switched endpoints */
1361 if (!usb_endpoint_dir_in(epread)) {
1362 /* descriptors are swapped */
1363 dev_dbg(&intf->dev,
1364 "The data interface has switched endpoints\n");
1365 swap(epread, epwrite);
1366 }
1367 made_compressed_probe:
1368 dev_dbg(&intf->dev, "interfaces are valid\n");
1369
1370 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1371 if (acm == NULL)
1372 goto alloc_fail;
1373
1374 tty_port_init(&acm->port);
1375 acm->port.ops = &acm_port_ops;
1376
1377 ctrlsize = usb_endpoint_maxp(epctrl);
1378 readsize = usb_endpoint_maxp(epread) *
1379 (quirks == SINGLE_RX_URB ? 1 : 2);
1380 acm->combined_interfaces = combined_interfaces;
1381 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1382 acm->control = control_interface;
1383 acm->data = data_interface;
1384
1385 usb_get_intf(acm->control); /* undone in destruct() */
1386
1387 minor = acm_alloc_minor(acm);
1388 if (minor < 0)
1389 goto alloc_fail1;
1390
1391 acm->minor = minor;
1392 acm->dev = usb_dev;
1393 if (h.usb_cdc_acm_descriptor)
1394 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1395 if (quirks & NO_CAP_LINE)
1396 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1397 acm->ctrlsize = ctrlsize;
1398 acm->readsize = readsize;
1399 acm->rx_buflimit = num_rx_buf;
1400 INIT_DELAYED_WORK(&acm->dwork, acm_softint);
1401 init_waitqueue_head(&acm->wioctl);
1402 spin_lock_init(&acm->write_lock);
1403 spin_lock_init(&acm->read_lock);
1404 mutex_init(&acm->mutex);
1405 if (usb_endpoint_xfer_int(epread)) {
1406 acm->bInterval = epread->bInterval;
1407 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1408 } else {
1409 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1410 }
1411 if (usb_endpoint_xfer_int(epwrite))
1412 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1413 else
1414 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1415 init_usb_anchor(&acm->delayed);
1416 acm->quirks = quirks;
1417
1418 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1419 if (!buf)
1420 goto alloc_fail1;
1421 acm->ctrl_buffer = buf;
1422
1423 if (acm_write_buffers_alloc(acm) < 0)
1424 goto alloc_fail2;
1425
1426 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1427 if (!acm->ctrlurb)
1428 goto alloc_fail3;
1429
1430 for (i = 0; i < num_rx_buf; i++) {
1431 struct acm_rb *rb = &(acm->read_buffers[i]);
1432 struct urb *urb;
1433
1434 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1435 &rb->dma);
1436 if (!rb->base)
1437 goto alloc_fail4;
1438 rb->index = i;
1439 rb->instance = acm;
1440
1441 urb = usb_alloc_urb(0, GFP_KERNEL);
1442 if (!urb)
1443 goto alloc_fail4;
1444
1445 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1446 urb->transfer_dma = rb->dma;
1447 if (usb_endpoint_xfer_int(epread))
1448 usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1449 acm->readsize,
1450 acm_read_bulk_callback, rb,
1451 acm->bInterval);
1452 else
1453 usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1454 acm->readsize,
1455 acm_read_bulk_callback, rb);
1456
1457 acm->read_urbs[i] = urb;
1458 __set_bit(i, &acm->read_urbs_free);
1459 }
1460 for (i = 0; i < ACM_NW; i++) {
1461 struct acm_wb *snd = &(acm->wb[i]);
1462
1463 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1464 if (snd->urb == NULL)
1465 goto alloc_fail5;
1466
1467 if (usb_endpoint_xfer_int(epwrite))
1468 usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1469 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1470 else
1471 usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1472 NULL, acm->writesize, acm_write_bulk, snd);
1473 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1474 if (quirks & SEND_ZERO_PACKET)
1475 snd->urb->transfer_flags |= URB_ZERO_PACKET;
1476 snd->instance = acm;
1477 }
1478
1479 usb_set_intfdata(intf, acm);
1480
1481 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1482 if (i < 0)
1483 goto alloc_fail5;
1484
1485 if (h.usb_cdc_country_functional_desc) { /* export the country data */
1486 struct usb_cdc_country_functional_desc * cfd =
1487 h.usb_cdc_country_functional_desc;
1488
1489 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1490 if (!acm->country_codes)
1491 goto skip_countries;
1492 acm->country_code_size = cfd->bLength - 4;
1493 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1494 cfd->bLength - 4);
1495 acm->country_rel_date = cfd->iCountryCodeRelDate;
1496
1497 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1498 if (i < 0) {
1499 kfree(acm->country_codes);
1500 acm->country_codes = NULL;
1501 acm->country_code_size = 0;
1502 goto skip_countries;
1503 }
1504
1505 i = device_create_file(&intf->dev,
1506 &dev_attr_iCountryCodeRelDate);
1507 if (i < 0) {
1508 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1509 kfree(acm->country_codes);
1510 acm->country_codes = NULL;
1511 acm->country_code_size = 0;
1512 goto skip_countries;
1513 }
1514 }
1515
1516 skip_countries:
1517 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1518 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1519 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1520 /* works around buggy devices */
1521 epctrl->bInterval ? epctrl->bInterval : 16);
1522 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1523 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1524 acm->notification_buffer = NULL;
1525 acm->nb_index = 0;
1526 acm->nb_size = 0;
1527
1528 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1529
1530 acm->line.dwDTERate = cpu_to_le32(9600);
1531 acm->line.bDataBits = 8;
1532 acm_set_line(acm, &acm->line);
1533
1534 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1535 usb_set_intfdata(data_interface, acm);
1536
1537 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1538 &control_interface->dev);
1539 if (IS_ERR(tty_dev)) {
1540 rv = PTR_ERR(tty_dev);
1541 goto alloc_fail6;
1542 }
1543
1544 if (quirks & CLEAR_HALT_CONDITIONS) {
1545 usb_clear_halt(usb_dev, acm->in);
1546 usb_clear_halt(usb_dev, acm->out);
1547 }
1548
1549 return 0;
1550 alloc_fail6:
1551 if (acm->country_codes) {
1552 device_remove_file(&acm->control->dev,
1553 &dev_attr_wCountryCodes);
1554 device_remove_file(&acm->control->dev,
1555 &dev_attr_iCountryCodeRelDate);
1556 kfree(acm->country_codes);
1557 }
1558 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1559 alloc_fail5:
1560 usb_set_intfdata(intf, NULL);
1561 for (i = 0; i < ACM_NW; i++)
1562 usb_free_urb(acm->wb[i].urb);
1563 alloc_fail4:
1564 for (i = 0; i < num_rx_buf; i++)
1565 usb_free_urb(acm->read_urbs[i]);
1566 acm_read_buffers_free(acm);
1567 usb_free_urb(acm->ctrlurb);
1568 alloc_fail3:
1569 acm_write_buffers_free(acm);
1570 alloc_fail2:
1571 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1572 alloc_fail1:
1573 tty_port_put(&acm->port);
1574 alloc_fail:
1575 return rv;
1576 }
1577
acm_disconnect(struct usb_interface * intf)1578 static void acm_disconnect(struct usb_interface *intf)
1579 {
1580 struct acm *acm = usb_get_intfdata(intf);
1581 struct tty_struct *tty;
1582 int i;
1583
1584 /* sibling interface is already cleaning up */
1585 if (!acm)
1586 return;
1587
1588 mutex_lock(&acm->mutex);
1589 acm->disconnected = true;
1590 if (acm->country_codes) {
1591 device_remove_file(&acm->control->dev,
1592 &dev_attr_wCountryCodes);
1593 device_remove_file(&acm->control->dev,
1594 &dev_attr_iCountryCodeRelDate);
1595 }
1596 wake_up_all(&acm->wioctl);
1597 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1598 usb_set_intfdata(acm->control, NULL);
1599 usb_set_intfdata(acm->data, NULL);
1600 mutex_unlock(&acm->mutex);
1601
1602 tty = tty_port_tty_get(&acm->port);
1603 if (tty) {
1604 tty_vhangup(tty);
1605 tty_kref_put(tty);
1606 }
1607
1608 acm_kill_urbs(acm);
1609 cancel_delayed_work_sync(&acm->dwork);
1610
1611 tty_unregister_device(acm_tty_driver, acm->minor);
1612
1613 usb_free_urb(acm->ctrlurb);
1614 for (i = 0; i < ACM_NW; i++)
1615 usb_free_urb(acm->wb[i].urb);
1616 for (i = 0; i < acm->rx_buflimit; i++)
1617 usb_free_urb(acm->read_urbs[i]);
1618 acm_write_buffers_free(acm);
1619 usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1620 acm_read_buffers_free(acm);
1621
1622 kfree(acm->notification_buffer);
1623
1624 if (!acm->combined_interfaces)
1625 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1626 acm->data : acm->control);
1627
1628 tty_port_put(&acm->port);
1629 }
1630
1631 #ifdef CONFIG_PM
acm_suspend(struct usb_interface * intf,pm_message_t message)1632 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1633 {
1634 struct acm *acm = usb_get_intfdata(intf);
1635 int cnt;
1636
1637 spin_lock_irq(&acm->write_lock);
1638 if (PMSG_IS_AUTO(message)) {
1639 if (acm->transmitting) {
1640 spin_unlock_irq(&acm->write_lock);
1641 return -EBUSY;
1642 }
1643 }
1644 cnt = acm->susp_count++;
1645 spin_unlock_irq(&acm->write_lock);
1646
1647 if (cnt)
1648 return 0;
1649
1650 acm_kill_urbs(acm);
1651 cancel_delayed_work_sync(&acm->dwork);
1652 acm->urbs_in_error_delay = 0;
1653
1654 return 0;
1655 }
1656
acm_resume(struct usb_interface * intf)1657 static int acm_resume(struct usb_interface *intf)
1658 {
1659 struct acm *acm = usb_get_intfdata(intf);
1660 struct urb *urb;
1661 int rv = 0;
1662
1663 spin_lock_irq(&acm->write_lock);
1664
1665 if (--acm->susp_count)
1666 goto out;
1667
1668 if (tty_port_initialized(&acm->port)) {
1669 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1670
1671 for (;;) {
1672 urb = usb_get_from_anchor(&acm->delayed);
1673 if (!urb)
1674 break;
1675
1676 acm_start_wb(acm, urb->context);
1677 }
1678
1679 /*
1680 * delayed error checking because we must
1681 * do the write path at all cost
1682 */
1683 if (rv < 0)
1684 goto out;
1685
1686 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1687 }
1688 out:
1689 spin_unlock_irq(&acm->write_lock);
1690
1691 return rv;
1692 }
1693
acm_reset_resume(struct usb_interface * intf)1694 static int acm_reset_resume(struct usb_interface *intf)
1695 {
1696 struct acm *acm = usb_get_intfdata(intf);
1697
1698 if (tty_port_initialized(&acm->port))
1699 tty_port_tty_hangup(&acm->port, false);
1700
1701 return acm_resume(intf);
1702 }
1703
1704 #endif /* CONFIG_PM */
1705
acm_pre_reset(struct usb_interface * intf)1706 static int acm_pre_reset(struct usb_interface *intf)
1707 {
1708 struct acm *acm = usb_get_intfdata(intf);
1709
1710 clear_bit(EVENT_RX_STALL, &acm->flags);
1711 acm->nb_index = 0; /* pending control transfers are lost */
1712
1713 return 0;
1714 }
1715
1716 #define NOKIA_PCSUITE_ACM_INFO(x) \
1717 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1718 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1719 USB_CDC_ACM_PROTO_VENDOR)
1720
1721 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1722 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1723 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1724 USB_CDC_ACM_PROTO_VENDOR)
1725
1726 /*
1727 * USB driver structure.
1728 */
1729
1730 static const struct usb_device_id acm_ids[] = {
1731 /* quirky and broken devices */
1732 { USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1733 .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
1734 { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1735 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1736 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1737 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1738 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1739 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1740 },
1741 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1742 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1743 },
1744 { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1745 .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1746 },
1747 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1748 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1749 },
1750 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1751 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1752 },
1753 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1754 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1755 },
1756 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1757 .driver_info = SINGLE_RX_URB,
1758 },
1759 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1760 .driver_info = SINGLE_RX_URB, /* firmware bug */
1761 },
1762 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1763 .driver_info = SINGLE_RX_URB, /* firmware bug */
1764 },
1765 { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1766 .driver_info = SINGLE_RX_URB,
1767 },
1768 { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1769 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1770 },
1771 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1772 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1773 },
1774 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1775 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1776 },
1777 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1778 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1779 },
1780 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1781 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1782 },
1783 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1784 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1785 },
1786 { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1787 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1788 },
1789 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1790 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1791 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1792 { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1793 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1794 },
1795 /* Motorola H24 HSPA module: */
1796 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1797 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1798 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1799 },
1800 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1801 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1802 },
1803 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1804 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1805 },
1806 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1807 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1808 },
1809 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1810 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1811 },
1812 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1813 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1814 },
1815 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1816 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1817 },
1818
1819 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1820 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1821 data interface instead of
1822 communications interface.
1823 Maybe we should define a new
1824 quirk for this. */
1825 },
1826 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1827 .driver_info = NO_UNION_NORMAL,
1828 },
1829 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1830 .driver_info = NO_UNION_NORMAL,
1831 },
1832 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1833 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1834 },
1835 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1836 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1837 },
1838 { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1839 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1840 },
1841 { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1842 .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1843 },
1844 { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1845 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1846 },
1847
1848 { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1849 .driver_info = CLEAR_HALT_CONDITIONS,
1850 },
1851
1852 /* Nokia S60 phones expose two ACM channels. The first is
1853 * a modem and is picked up by the standard AT-command
1854 * information below. The second is 'vendor-specific' but
1855 * is treated as a serial device at the S60 end, so we want
1856 * to expose it on Linux too. */
1857 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1858 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1859 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1860 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1861 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1862 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1863 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1864 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1865 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1866 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1867 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1868 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1869 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1870 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1871 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1872 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1873 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1874 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1875 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1876 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1877 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1878 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1879 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1880 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1881 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1882 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1883 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1884 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1885 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1886 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1887 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1888 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1889 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1890 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1891 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1892 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1893 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1894 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1895 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1896 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1897 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1898 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1899 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1900 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1901 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1902 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1903 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1904 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1905 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1906 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1907 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1908 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1909 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1910 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1911 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1912 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1913 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1914 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1915
1916 /* Support for Owen devices */
1917 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1918
1919 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1920
1921 /* Support for Droids MuIn LCD */
1922 { USB_DEVICE(0x04d8, 0x000b),
1923 .driver_info = NO_DATA_INTERFACE,
1924 },
1925
1926 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1927 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1928 .driver_info = IGNORE_DEVICE,
1929 },
1930 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1931 .driver_info = IGNORE_DEVICE,
1932 },
1933 #endif
1934
1935 /*Samsung phone in firmware update mode */
1936 { USB_DEVICE(0x04e8, 0x685d),
1937 .driver_info = IGNORE_DEVICE,
1938 },
1939
1940 /* Exclude Infineon Flash Loader utility */
1941 { USB_DEVICE(0x058b, 0x0041),
1942 .driver_info = IGNORE_DEVICE,
1943 },
1944
1945 /* Exclude ETAS ES58x */
1946 { USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
1947 .driver_info = IGNORE_DEVICE,
1948 },
1949 { USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
1950 .driver_info = IGNORE_DEVICE,
1951 },
1952 { USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
1953 .driver_info = IGNORE_DEVICE,
1954 },
1955
1956 { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1957 .driver_info = SEND_ZERO_PACKET,
1958 },
1959 { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1960 .driver_info = SEND_ZERO_PACKET,
1961 },
1962
1963 /* control interfaces without any protocol set */
1964 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1965 USB_CDC_PROTO_NONE) },
1966
1967 /* control interfaces with various AT-command sets */
1968 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1969 USB_CDC_ACM_PROTO_AT_V25TER) },
1970 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1971 USB_CDC_ACM_PROTO_AT_PCCA101) },
1972 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1973 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1974 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1975 USB_CDC_ACM_PROTO_AT_GSM) },
1976 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1977 USB_CDC_ACM_PROTO_AT_3G) },
1978 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1979 USB_CDC_ACM_PROTO_AT_CDMA) },
1980
1981 { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1982 .driver_info = SEND_ZERO_PACKET,
1983 },
1984
1985 { }
1986 };
1987
1988 MODULE_DEVICE_TABLE(usb, acm_ids);
1989
1990 static struct usb_driver acm_driver = {
1991 .name = "cdc_acm",
1992 .probe = acm_probe,
1993 .disconnect = acm_disconnect,
1994 #ifdef CONFIG_PM
1995 .suspend = acm_suspend,
1996 .resume = acm_resume,
1997 .reset_resume = acm_reset_resume,
1998 #endif
1999 .pre_reset = acm_pre_reset,
2000 .id_table = acm_ids,
2001 #ifdef CONFIG_PM
2002 .supports_autosuspend = 1,
2003 #endif
2004 .disable_hub_initiated_lpm = 1,
2005 };
2006
2007 /*
2008 * TTY driver structures.
2009 */
2010
2011 static const struct tty_operations acm_ops = {
2012 .install = acm_tty_install,
2013 .open = acm_tty_open,
2014 .close = acm_tty_close,
2015 .cleanup = acm_tty_cleanup,
2016 .hangup = acm_tty_hangup,
2017 .write = acm_tty_write,
2018 .write_room = acm_tty_write_room,
2019 .ioctl = acm_tty_ioctl,
2020 .throttle = acm_tty_throttle,
2021 .unthrottle = acm_tty_unthrottle,
2022 .chars_in_buffer = acm_tty_chars_in_buffer,
2023 .break_ctl = acm_tty_break_ctl,
2024 .set_termios = acm_tty_set_termios,
2025 .tiocmget = acm_tty_tiocmget,
2026 .tiocmset = acm_tty_tiocmset,
2027 .get_icount = acm_tty_get_icount,
2028 };
2029
2030 /*
2031 * Init / exit.
2032 */
2033
acm_init(void)2034 static int __init acm_init(void)
2035 {
2036 int retval;
2037 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
2038 if (!acm_tty_driver)
2039 return -ENOMEM;
2040 acm_tty_driver->driver_name = "acm",
2041 acm_tty_driver->name = "ttyACM",
2042 acm_tty_driver->major = ACM_TTY_MAJOR,
2043 acm_tty_driver->minor_start = 0,
2044 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2045 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2046 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2047 acm_tty_driver->init_termios = tty_std_termios;
2048 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2049 HUPCL | CLOCAL;
2050 tty_set_operations(acm_tty_driver, &acm_ops);
2051
2052 retval = tty_register_driver(acm_tty_driver);
2053 if (retval) {
2054 put_tty_driver(acm_tty_driver);
2055 return retval;
2056 }
2057
2058 retval = usb_register(&acm_driver);
2059 if (retval) {
2060 tty_unregister_driver(acm_tty_driver);
2061 put_tty_driver(acm_tty_driver);
2062 return retval;
2063 }
2064
2065 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2066
2067 return 0;
2068 }
2069
acm_exit(void)2070 static void __exit acm_exit(void)
2071 {
2072 usb_deregister(&acm_driver);
2073 tty_unregister_driver(acm_tty_driver);
2074 put_tty_driver(acm_tty_driver);
2075 idr_destroy(&acm_minors);
2076 }
2077
2078 module_init(acm_init);
2079 module_exit(acm_exit);
2080
2081 MODULE_AUTHOR(DRIVER_AUTHOR);
2082 MODULE_DESCRIPTION(DRIVER_DESC);
2083 MODULE_LICENSE("GPL");
2084 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
2085