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/tty_ldisc.h>
32 #include <linux/module.h>
33 #include <linux/mutex.h>
34 #include <linux/uaccess.h>
35 #include <linux/usb.h>
36 #include <linux/usb/cdc.h>
37 #include <asm/byteorder.h>
38 #include <asm/unaligned.h>
39 #include <linux/idr.h>
40 #include <linux/list.h>
41
42 #include "cdc-acm.h"
43
44
45 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
46 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
47
48 static struct usb_driver acm_driver;
49 static struct tty_driver *acm_tty_driver;
50
51 static DEFINE_IDR(acm_minors);
52 static DEFINE_MUTEX(acm_minors_lock);
53
54 static void acm_tty_set_termios(struct tty_struct *tty,
55 const struct ktermios *termios_old);
56
57 /*
58 * acm_minors accessors
59 */
60
61 /*
62 * Look up an ACM structure by minor. If found and not disconnected, increment
63 * its refcount and return it with its mutex held.
64 */
acm_get_by_minor(unsigned int minor)65 static struct acm *acm_get_by_minor(unsigned int minor)
66 {
67 struct acm *acm;
68
69 mutex_lock(&acm_minors_lock);
70 acm = idr_find(&acm_minors, minor);
71 if (acm) {
72 mutex_lock(&acm->mutex);
73 if (acm->disconnected) {
74 mutex_unlock(&acm->mutex);
75 acm = NULL;
76 } else {
77 tty_port_get(&acm->port);
78 mutex_unlock(&acm->mutex);
79 }
80 }
81 mutex_unlock(&acm_minors_lock);
82 return acm;
83 }
84
85 /*
86 * Try to find an available minor number and if found, associate it with 'acm'.
87 */
acm_alloc_minor(struct acm * acm)88 static int acm_alloc_minor(struct acm *acm)
89 {
90 int minor;
91
92 mutex_lock(&acm_minors_lock);
93 minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
94 mutex_unlock(&acm_minors_lock);
95
96 return minor;
97 }
98
99 /* Release the minor number associated with 'acm'. */
acm_release_minor(struct acm * acm)100 static void acm_release_minor(struct acm *acm)
101 {
102 mutex_lock(&acm_minors_lock);
103 idr_remove(&acm_minors, acm->minor);
104 mutex_unlock(&acm_minors_lock);
105 }
106
107 /*
108 * Functions for ACM control messages.
109 */
110
acm_ctrl_msg(struct acm * acm,int request,int value,void * buf,int len)111 static int acm_ctrl_msg(struct acm *acm, int request, int value,
112 void *buf, int len)
113 {
114 int retval;
115
116 retval = usb_autopm_get_interface(acm->control);
117 if (retval)
118 return retval;
119
120 retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
121 request, USB_RT_ACM, value,
122 acm->control->altsetting[0].desc.bInterfaceNumber,
123 buf, len, USB_CTRL_SET_TIMEOUT);
124
125 dev_dbg(&acm->control->dev,
126 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
127 __func__, request, value, len, retval);
128
129 usb_autopm_put_interface(acm->control);
130
131 return retval < 0 ? retval : 0;
132 }
133
134 /* devices aren't required to support these requests.
135 * the cdc acm descriptor tells whether they do...
136 */
acm_set_control(struct acm * acm,int control)137 static inline int acm_set_control(struct acm *acm, int control)
138 {
139 if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
140 return -EOPNOTSUPP;
141
142 return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
143 control, NULL, 0);
144 }
145
146 #define acm_set_line(acm, line) \
147 acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
148 #define acm_send_break(acm, ms) \
149 acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
150
acm_poison_urbs(struct acm * acm)151 static void acm_poison_urbs(struct acm *acm)
152 {
153 int i;
154
155 usb_poison_urb(acm->ctrlurb);
156 for (i = 0; i < ACM_NW; i++)
157 usb_poison_urb(acm->wb[i].urb);
158 for (i = 0; i < acm->rx_buflimit; i++)
159 usb_poison_urb(acm->read_urbs[i]);
160 }
161
acm_unpoison_urbs(struct acm * acm)162 static void acm_unpoison_urbs(struct acm *acm)
163 {
164 int i;
165
166 for (i = 0; i < acm->rx_buflimit; i++)
167 usb_unpoison_urb(acm->read_urbs[i]);
168 for (i = 0; i < ACM_NW; i++)
169 usb_unpoison_urb(acm->wb[i].urb);
170 usb_unpoison_urb(acm->ctrlurb);
171 }
172
173
174 /*
175 * Write buffer management.
176 * All of these assume proper locks taken by the caller.
177 */
178
acm_wb_alloc(struct acm * acm)179 static int acm_wb_alloc(struct acm *acm)
180 {
181 int i, wbn;
182 struct acm_wb *wb;
183
184 wbn = 0;
185 i = 0;
186 for (;;) {
187 wb = &acm->wb[wbn];
188 if (!wb->use) {
189 wb->use = true;
190 wb->len = 0;
191 return wbn;
192 }
193 wbn = (wbn + 1) % ACM_NW;
194 if (++i >= ACM_NW)
195 return -1;
196 }
197 }
198
acm_wb_is_avail(struct acm * acm)199 static int acm_wb_is_avail(struct acm *acm)
200 {
201 int i, n;
202 unsigned long flags;
203
204 n = ACM_NW;
205 spin_lock_irqsave(&acm->write_lock, flags);
206 for (i = 0; i < ACM_NW; i++)
207 if(acm->wb[i].use)
208 n--;
209 spin_unlock_irqrestore(&acm->write_lock, flags);
210 return n;
211 }
212
213 /*
214 * Finish write. Caller must hold acm->write_lock
215 */
acm_write_done(struct acm * acm,struct acm_wb * wb)216 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
217 {
218 wb->use = false;
219 acm->transmitting--;
220 usb_autopm_put_interface_async(acm->control);
221 }
222
223 /*
224 * Poke write.
225 *
226 * the caller is responsible for locking
227 */
228
acm_start_wb(struct acm * acm,struct acm_wb * wb)229 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
230 {
231 int rc;
232
233 acm->transmitting++;
234
235 wb->urb->transfer_buffer = wb->buf;
236 wb->urb->transfer_dma = wb->dmah;
237 wb->urb->transfer_buffer_length = wb->len;
238 wb->urb->dev = acm->dev;
239
240 rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
241 if (rc < 0) {
242 if (rc != -EPERM)
243 dev_err(&acm->data->dev,
244 "%s - usb_submit_urb(write bulk) failed: %d\n",
245 __func__, rc);
246 acm_write_done(acm, wb);
247 }
248 return rc;
249 }
250
251 /*
252 * attributes exported through sysfs
253 */
bmCapabilities_show(struct device * dev,struct device_attribute * attr,char * buf)254 static ssize_t bmCapabilities_show
255 (struct device *dev, struct device_attribute *attr, char *buf)
256 {
257 struct usb_interface *intf = to_usb_interface(dev);
258 struct acm *acm = usb_get_intfdata(intf);
259
260 return sprintf(buf, "%d", acm->ctrl_caps);
261 }
262 static DEVICE_ATTR_RO(bmCapabilities);
263
wCountryCodes_show(struct device * dev,struct device_attribute * attr,char * buf)264 static ssize_t wCountryCodes_show
265 (struct device *dev, struct device_attribute *attr, char *buf)
266 {
267 struct usb_interface *intf = to_usb_interface(dev);
268 struct acm *acm = usb_get_intfdata(intf);
269
270 memcpy(buf, acm->country_codes, acm->country_code_size);
271 return acm->country_code_size;
272 }
273
274 static DEVICE_ATTR_RO(wCountryCodes);
275
iCountryCodeRelDate_show(struct device * dev,struct device_attribute * attr,char * buf)276 static ssize_t iCountryCodeRelDate_show
277 (struct device *dev, struct device_attribute *attr, char *buf)
278 {
279 struct usb_interface *intf = to_usb_interface(dev);
280 struct acm *acm = usb_get_intfdata(intf);
281
282 return sprintf(buf, "%d", acm->country_rel_date);
283 }
284
285 static DEVICE_ATTR_RO(iCountryCodeRelDate);
286 /*
287 * Interrupt handlers for various ACM device responses
288 */
289
acm_process_notification(struct acm * acm,unsigned char * buf)290 static void acm_process_notification(struct acm *acm, unsigned char *buf)
291 {
292 int newctrl;
293 int difference;
294 unsigned long flags;
295 struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
296 unsigned char *data = buf + sizeof(struct usb_cdc_notification);
297
298 switch (dr->bNotificationType) {
299 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
300 dev_dbg(&acm->control->dev,
301 "%s - network connection: %d\n", __func__, dr->wValue);
302 break;
303
304 case USB_CDC_NOTIFY_SERIAL_STATE:
305 if (le16_to_cpu(dr->wLength) != 2) {
306 dev_dbg(&acm->control->dev,
307 "%s - malformed serial state\n", __func__);
308 break;
309 }
310
311 newctrl = get_unaligned_le16(data);
312 dev_dbg(&acm->control->dev,
313 "%s - serial state: 0x%x\n", __func__, newctrl);
314
315 if (!acm->clocal && (acm->ctrlin & ~newctrl & USB_CDC_SERIAL_STATE_DCD)) {
316 dev_dbg(&acm->control->dev,
317 "%s - calling hangup\n", __func__);
318 tty_port_tty_hangup(&acm->port, false);
319 }
320
321 difference = acm->ctrlin ^ newctrl;
322
323 if ((difference & USB_CDC_SERIAL_STATE_DCD) && acm->port.tty) {
324 struct tty_ldisc *ld = tty_ldisc_ref(acm->port.tty);
325 if (ld) {
326 if (ld->ops->dcd_change)
327 ld->ops->dcd_change(acm->port.tty, newctrl & USB_CDC_SERIAL_STATE_DCD);
328 tty_ldisc_deref(ld);
329 }
330 }
331
332 spin_lock_irqsave(&acm->read_lock, flags);
333 acm->ctrlin = newctrl;
334 acm->oldcount = acm->iocount;
335
336 if (difference & USB_CDC_SERIAL_STATE_DSR)
337 acm->iocount.dsr++;
338 if (difference & USB_CDC_SERIAL_STATE_DCD)
339 acm->iocount.dcd++;
340 if (newctrl & USB_CDC_SERIAL_STATE_BREAK) {
341 acm->iocount.brk++;
342 tty_insert_flip_char(&acm->port, 0, TTY_BREAK);
343 }
344 if (newctrl & USB_CDC_SERIAL_STATE_RING_SIGNAL)
345 acm->iocount.rng++;
346 if (newctrl & USB_CDC_SERIAL_STATE_FRAMING)
347 acm->iocount.frame++;
348 if (newctrl & USB_CDC_SERIAL_STATE_PARITY)
349 acm->iocount.parity++;
350 if (newctrl & USB_CDC_SERIAL_STATE_OVERRUN)
351 acm->iocount.overrun++;
352 spin_unlock_irqrestore(&acm->read_lock, flags);
353
354 if (newctrl & USB_CDC_SERIAL_STATE_BREAK)
355 tty_flip_buffer_push(&acm->port);
356
357 if (difference)
358 wake_up_all(&acm->wioctl);
359
360 break;
361
362 default:
363 dev_dbg(&acm->control->dev,
364 "%s - unknown notification %d received: index %d len %d\n",
365 __func__,
366 dr->bNotificationType, dr->wIndex, dr->wLength);
367 }
368 }
369
370 /* control interface reports status changes with "interrupt" transfers */
acm_ctrl_irq(struct urb * urb)371 static void acm_ctrl_irq(struct urb *urb)
372 {
373 struct acm *acm = urb->context;
374 struct usb_cdc_notification *dr = urb->transfer_buffer;
375 unsigned int current_size = urb->actual_length;
376 unsigned int expected_size, copy_size, alloc_size;
377 int retval;
378 int status = urb->status;
379
380 switch (status) {
381 case 0:
382 /* success */
383 break;
384 case -ECONNRESET:
385 case -ENOENT:
386 case -ESHUTDOWN:
387 /* this urb is terminated, clean up */
388 dev_dbg(&acm->control->dev,
389 "%s - urb shutting down with status: %d\n",
390 __func__, status);
391 return;
392 default:
393 dev_dbg(&acm->control->dev,
394 "%s - nonzero urb status received: %d\n",
395 __func__, status);
396 goto exit;
397 }
398
399 usb_mark_last_busy(acm->dev);
400
401 if (acm->nb_index)
402 dr = (struct usb_cdc_notification *)acm->notification_buffer;
403
404 /* size = notification-header + (optional) data */
405 expected_size = sizeof(struct usb_cdc_notification) +
406 le16_to_cpu(dr->wLength);
407
408 if (current_size < expected_size) {
409 /* notification is transmitted fragmented, reassemble */
410 if (acm->nb_size < expected_size) {
411 u8 *new_buffer;
412 alloc_size = roundup_pow_of_two(expected_size);
413 /* Final freeing is done on disconnect. */
414 new_buffer = krealloc(acm->notification_buffer,
415 alloc_size, GFP_ATOMIC);
416 if (!new_buffer) {
417 acm->nb_index = 0;
418 goto exit;
419 }
420
421 acm->notification_buffer = new_buffer;
422 acm->nb_size = alloc_size;
423 dr = (struct usb_cdc_notification *)acm->notification_buffer;
424 }
425
426 copy_size = min(current_size,
427 expected_size - acm->nb_index);
428
429 memcpy(&acm->notification_buffer[acm->nb_index],
430 urb->transfer_buffer, copy_size);
431 acm->nb_index += copy_size;
432 current_size = acm->nb_index;
433 }
434
435 if (current_size >= expected_size) {
436 /* notification complete */
437 acm_process_notification(acm, (unsigned char *)dr);
438 acm->nb_index = 0;
439 }
440
441 exit:
442 retval = usb_submit_urb(urb, GFP_ATOMIC);
443 if (retval && retval != -EPERM && retval != -ENODEV)
444 dev_err(&acm->control->dev,
445 "%s - usb_submit_urb failed: %d\n", __func__, retval);
446 else
447 dev_vdbg(&acm->control->dev,
448 "control resubmission terminated %d\n", retval);
449 }
450
acm_submit_read_urb(struct acm * acm,int index,gfp_t mem_flags)451 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
452 {
453 int res;
454
455 if (!test_and_clear_bit(index, &acm->read_urbs_free))
456 return 0;
457
458 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
459 if (res) {
460 if (res != -EPERM && res != -ENODEV) {
461 dev_err(&acm->data->dev,
462 "urb %d failed submission with %d\n",
463 index, res);
464 } else {
465 dev_vdbg(&acm->data->dev, "intended failure %d\n", res);
466 }
467 set_bit(index, &acm->read_urbs_free);
468 return res;
469 } else {
470 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
471 }
472
473 return 0;
474 }
475
acm_submit_read_urbs(struct acm * acm,gfp_t mem_flags)476 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
477 {
478 int res;
479 int i;
480
481 for (i = 0; i < acm->rx_buflimit; ++i) {
482 res = acm_submit_read_urb(acm, i, mem_flags);
483 if (res)
484 return res;
485 }
486
487 return 0;
488 }
489
acm_process_read_urb(struct acm * acm,struct urb * urb)490 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
491 {
492 unsigned long flags;
493
494 if (!urb->actual_length)
495 return;
496
497 spin_lock_irqsave(&acm->read_lock, flags);
498 tty_insert_flip_string(&acm->port, urb->transfer_buffer,
499 urb->actual_length);
500 spin_unlock_irqrestore(&acm->read_lock, flags);
501
502 tty_flip_buffer_push(&acm->port);
503 }
504
acm_read_bulk_callback(struct urb * urb)505 static void acm_read_bulk_callback(struct urb *urb)
506 {
507 struct acm_rb *rb = urb->context;
508 struct acm *acm = rb->instance;
509 int status = urb->status;
510 bool stopped = false;
511 bool stalled = false;
512 bool cooldown = false;
513
514 dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
515 rb->index, urb->actual_length, status);
516
517 switch (status) {
518 case 0:
519 usb_mark_last_busy(acm->dev);
520 acm_process_read_urb(acm, urb);
521 break;
522 case -EPIPE:
523 set_bit(EVENT_RX_STALL, &acm->flags);
524 stalled = true;
525 break;
526 case -ENOENT:
527 case -ECONNRESET:
528 case -ESHUTDOWN:
529 dev_dbg(&acm->data->dev,
530 "%s - urb shutting down with status: %d\n",
531 __func__, status);
532 stopped = true;
533 break;
534 case -EOVERFLOW:
535 case -EPROTO:
536 dev_dbg(&acm->data->dev,
537 "%s - cooling babbling device\n", __func__);
538 usb_mark_last_busy(acm->dev);
539 set_bit(rb->index, &acm->urbs_in_error_delay);
540 set_bit(ACM_ERROR_DELAY, &acm->flags);
541 cooldown = true;
542 break;
543 default:
544 dev_dbg(&acm->data->dev,
545 "%s - nonzero urb status received: %d\n",
546 __func__, status);
547 break;
548 }
549
550 /*
551 * Make sure URB processing is done before marking as free to avoid
552 * racing with unthrottle() on another CPU. Matches the barriers
553 * implied by the test_and_clear_bit() in acm_submit_read_urb().
554 */
555 smp_mb__before_atomic();
556 set_bit(rb->index, &acm->read_urbs_free);
557 /*
558 * Make sure URB is marked as free before checking the throttled flag
559 * to avoid racing with unthrottle() on another CPU. Matches the
560 * smp_mb() in unthrottle().
561 */
562 smp_mb__after_atomic();
563
564 if (stopped || stalled || cooldown) {
565 if (stalled)
566 schedule_delayed_work(&acm->dwork, 0);
567 else if (cooldown)
568 schedule_delayed_work(&acm->dwork, HZ / 2);
569 return;
570 }
571
572 if (test_bit(ACM_THROTTLED, &acm->flags))
573 return;
574
575 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
576 }
577
578 /* data interface wrote those outgoing bytes */
acm_write_bulk(struct urb * urb)579 static void acm_write_bulk(struct urb *urb)
580 {
581 struct acm_wb *wb = urb->context;
582 struct acm *acm = wb->instance;
583 unsigned long flags;
584 int status = urb->status;
585
586 if (status || (urb->actual_length != urb->transfer_buffer_length))
587 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
588 urb->actual_length,
589 urb->transfer_buffer_length,
590 status);
591
592 spin_lock_irqsave(&acm->write_lock, flags);
593 acm_write_done(acm, wb);
594 spin_unlock_irqrestore(&acm->write_lock, flags);
595 set_bit(EVENT_TTY_WAKEUP, &acm->flags);
596 schedule_delayed_work(&acm->dwork, 0);
597 }
598
acm_softint(struct work_struct * work)599 static void acm_softint(struct work_struct *work)
600 {
601 int i;
602 struct acm *acm = container_of(work, struct acm, dwork.work);
603
604 if (test_bit(EVENT_RX_STALL, &acm->flags)) {
605 smp_mb(); /* against acm_suspend() */
606 if (!acm->susp_count) {
607 for (i = 0; i < acm->rx_buflimit; i++)
608 usb_kill_urb(acm->read_urbs[i]);
609 usb_clear_halt(acm->dev, acm->in);
610 acm_submit_read_urbs(acm, GFP_KERNEL);
611 clear_bit(EVENT_RX_STALL, &acm->flags);
612 }
613 }
614
615 if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
616 for (i = 0; i < acm->rx_buflimit; i++)
617 if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
618 acm_submit_read_urb(acm, i, GFP_KERNEL);
619 }
620
621 if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
622 tty_port_tty_wakeup(&acm->port);
623 }
624
625 /*
626 * TTY handlers
627 */
628
acm_tty_install(struct tty_driver * driver,struct tty_struct * tty)629 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
630 {
631 struct acm *acm;
632 int retval;
633
634 acm = acm_get_by_minor(tty->index);
635 if (!acm)
636 return -ENODEV;
637
638 retval = tty_standard_install(driver, tty);
639 if (retval)
640 goto error_init_termios;
641
642 /*
643 * Suppress initial echoing for some devices which might send data
644 * immediately after acm driver has been installed.
645 */
646 if (acm->quirks & DISABLE_ECHO)
647 tty->termios.c_lflag &= ~ECHO;
648
649 tty->driver_data = acm;
650
651 return 0;
652
653 error_init_termios:
654 tty_port_put(&acm->port);
655 return retval;
656 }
657
acm_tty_open(struct tty_struct * tty,struct file * filp)658 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
659 {
660 struct acm *acm = tty->driver_data;
661
662 return tty_port_open(&acm->port, tty, filp);
663 }
664
acm_port_dtr_rts(struct tty_port * port,bool active)665 static void acm_port_dtr_rts(struct tty_port *port, bool active)
666 {
667 struct acm *acm = container_of(port, struct acm, port);
668 int val;
669 int res;
670
671 if (active)
672 val = USB_CDC_CTRL_DTR | USB_CDC_CTRL_RTS;
673 else
674 val = 0;
675
676 /* FIXME: add missing ctrlout locking throughout driver */
677 acm->ctrlout = val;
678
679 res = acm_set_control(acm, val);
680 if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
681 /* This is broken in too many devices to spam the logs */
682 dev_dbg(&acm->control->dev, "failed to set dtr/rts\n");
683 }
684
acm_port_activate(struct tty_port * port,struct tty_struct * tty)685 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
686 {
687 struct acm *acm = container_of(port, struct acm, port);
688 int retval = -ENODEV;
689 int i;
690
691 mutex_lock(&acm->mutex);
692 if (acm->disconnected)
693 goto disconnected;
694
695 retval = usb_autopm_get_interface(acm->control);
696 if (retval)
697 goto error_get_interface;
698
699 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
700 acm->control->needs_remote_wakeup = 1;
701
702 acm->ctrlurb->dev = acm->dev;
703 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
704 if (retval) {
705 dev_err(&acm->control->dev,
706 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
707 goto error_submit_urb;
708 }
709
710 acm_tty_set_termios(tty, NULL);
711
712 /*
713 * Unthrottle device in case the TTY was closed while throttled.
714 */
715 clear_bit(ACM_THROTTLED, &acm->flags);
716
717 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
718 if (retval)
719 goto error_submit_read_urbs;
720
721 usb_autopm_put_interface(acm->control);
722
723 mutex_unlock(&acm->mutex);
724
725 return 0;
726
727 error_submit_read_urbs:
728 for (i = 0; i < acm->rx_buflimit; i++)
729 usb_kill_urb(acm->read_urbs[i]);
730 usb_kill_urb(acm->ctrlurb);
731 error_submit_urb:
732 usb_autopm_put_interface(acm->control);
733 error_get_interface:
734 disconnected:
735 mutex_unlock(&acm->mutex);
736
737 return usb_translate_errors(retval);
738 }
739
acm_port_destruct(struct tty_port * port)740 static void acm_port_destruct(struct tty_port *port)
741 {
742 struct acm *acm = container_of(port, struct acm, port);
743
744 if (acm->minor != ACM_MINOR_INVALID)
745 acm_release_minor(acm);
746 usb_put_intf(acm->control);
747 kfree(acm->country_codes);
748 kfree(acm);
749 }
750
acm_port_shutdown(struct tty_port * port)751 static void acm_port_shutdown(struct tty_port *port)
752 {
753 struct acm *acm = container_of(port, struct acm, port);
754 struct urb *urb;
755 struct acm_wb *wb;
756
757 /*
758 * Need to grab write_lock to prevent race with resume, but no need to
759 * hold it due to the tty-port initialised flag.
760 */
761 acm_poison_urbs(acm);
762 spin_lock_irq(&acm->write_lock);
763 spin_unlock_irq(&acm->write_lock);
764
765 usb_autopm_get_interface_no_resume(acm->control);
766 acm->control->needs_remote_wakeup = 0;
767 usb_autopm_put_interface(acm->control);
768
769 for (;;) {
770 urb = usb_get_from_anchor(&acm->delayed);
771 if (!urb)
772 break;
773 wb = urb->context;
774 wb->use = false;
775 usb_autopm_put_interface_async(acm->control);
776 }
777
778 acm_unpoison_urbs(acm);
779
780 }
781
acm_tty_cleanup(struct tty_struct * tty)782 static void acm_tty_cleanup(struct tty_struct *tty)
783 {
784 struct acm *acm = tty->driver_data;
785
786 tty_port_put(&acm->port);
787 }
788
acm_tty_hangup(struct tty_struct * tty)789 static void acm_tty_hangup(struct tty_struct *tty)
790 {
791 struct acm *acm = tty->driver_data;
792
793 tty_port_hangup(&acm->port);
794 }
795
acm_tty_close(struct tty_struct * tty,struct file * filp)796 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
797 {
798 struct acm *acm = tty->driver_data;
799
800 tty_port_close(&acm->port, tty, filp);
801 }
802
acm_tty_write(struct tty_struct * tty,const u8 * buf,size_t count)803 static ssize_t acm_tty_write(struct tty_struct *tty, const u8 *buf,
804 size_t count)
805 {
806 struct acm *acm = tty->driver_data;
807 int stat;
808 unsigned long flags;
809 int wbn;
810 struct acm_wb *wb;
811
812 if (!count)
813 return 0;
814
815 dev_vdbg(&acm->data->dev, "%zu bytes from tty layer\n", count);
816
817 spin_lock_irqsave(&acm->write_lock, flags);
818 wbn = acm_wb_alloc(acm);
819 if (wbn < 0) {
820 spin_unlock_irqrestore(&acm->write_lock, flags);
821 return 0;
822 }
823 wb = &acm->wb[wbn];
824
825 if (!acm->dev) {
826 wb->use = false;
827 spin_unlock_irqrestore(&acm->write_lock, flags);
828 return -ENODEV;
829 }
830
831 count = (count > acm->writesize) ? acm->writesize : count;
832 dev_vdbg(&acm->data->dev, "writing %zu bytes\n", count);
833 memcpy(wb->buf, buf, count);
834 wb->len = count;
835
836 stat = usb_autopm_get_interface_async(acm->control);
837 if (stat) {
838 wb->use = false;
839 spin_unlock_irqrestore(&acm->write_lock, flags);
840 return stat;
841 }
842
843 if (acm->susp_count) {
844 usb_anchor_urb(wb->urb, &acm->delayed);
845 spin_unlock_irqrestore(&acm->write_lock, flags);
846 return count;
847 }
848
849 stat = acm_start_wb(acm, wb);
850 spin_unlock_irqrestore(&acm->write_lock, flags);
851
852 if (stat < 0)
853 return stat;
854 return count;
855 }
856
acm_tty_write_room(struct tty_struct * tty)857 static unsigned int acm_tty_write_room(struct tty_struct *tty)
858 {
859 struct acm *acm = tty->driver_data;
860 /*
861 * Do not let the line discipline to know that we have a reserve,
862 * or it might get too enthusiastic.
863 */
864 return acm_wb_is_avail(acm) ? acm->writesize : 0;
865 }
866
acm_tty_flush_buffer(struct tty_struct * tty)867 static void acm_tty_flush_buffer(struct tty_struct *tty)
868 {
869 struct acm *acm = tty->driver_data;
870 unsigned long flags;
871 int i;
872
873 spin_lock_irqsave(&acm->write_lock, flags);
874 for (i = 0; i < ACM_NW; i++)
875 if (acm->wb[i].use)
876 usb_unlink_urb(acm->wb[i].urb);
877 spin_unlock_irqrestore(&acm->write_lock, flags);
878 }
879
acm_tty_chars_in_buffer(struct tty_struct * tty)880 static unsigned int acm_tty_chars_in_buffer(struct tty_struct *tty)
881 {
882 struct acm *acm = tty->driver_data;
883 /*
884 * if the device was unplugged then any remaining characters fell out
885 * of the connector ;)
886 */
887 if (acm->disconnected)
888 return 0;
889 /*
890 * This is inaccurate (overcounts), but it works.
891 */
892 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
893 }
894
acm_tty_throttle(struct tty_struct * tty)895 static void acm_tty_throttle(struct tty_struct *tty)
896 {
897 struct acm *acm = tty->driver_data;
898
899 set_bit(ACM_THROTTLED, &acm->flags);
900 }
901
acm_tty_unthrottle(struct tty_struct * tty)902 static void acm_tty_unthrottle(struct tty_struct *tty)
903 {
904 struct acm *acm = tty->driver_data;
905
906 clear_bit(ACM_THROTTLED, &acm->flags);
907
908 /* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
909 smp_mb();
910
911 acm_submit_read_urbs(acm, GFP_KERNEL);
912 }
913
acm_tty_break_ctl(struct tty_struct * tty,int state)914 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
915 {
916 struct acm *acm = tty->driver_data;
917 int retval;
918
919 if (!(acm->ctrl_caps & USB_CDC_CAP_BRK))
920 return -EOPNOTSUPP;
921
922 retval = acm_send_break(acm, state ? 0xffff : 0);
923 if (retval < 0)
924 dev_dbg(&acm->control->dev,
925 "%s - send break failed\n", __func__);
926 return retval;
927 }
928
acm_tty_tiocmget(struct tty_struct * tty)929 static int acm_tty_tiocmget(struct tty_struct *tty)
930 {
931 struct acm *acm = tty->driver_data;
932
933 return (acm->ctrlout & USB_CDC_CTRL_DTR ? TIOCM_DTR : 0) |
934 (acm->ctrlout & USB_CDC_CTRL_RTS ? TIOCM_RTS : 0) |
935 (acm->ctrlin & USB_CDC_SERIAL_STATE_DSR ? TIOCM_DSR : 0) |
936 (acm->ctrlin & USB_CDC_SERIAL_STATE_RING_SIGNAL ? TIOCM_RI : 0) |
937 (acm->ctrlin & USB_CDC_SERIAL_STATE_DCD ? TIOCM_CD : 0) |
938 TIOCM_CTS;
939 }
940
acm_tty_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)941 static int acm_tty_tiocmset(struct tty_struct *tty,
942 unsigned int set, unsigned int clear)
943 {
944 struct acm *acm = tty->driver_data;
945 unsigned int newctrl;
946
947 newctrl = acm->ctrlout;
948 set = (set & TIOCM_DTR ? USB_CDC_CTRL_DTR : 0) |
949 (set & TIOCM_RTS ? USB_CDC_CTRL_RTS : 0);
950 clear = (clear & TIOCM_DTR ? USB_CDC_CTRL_DTR : 0) |
951 (clear & TIOCM_RTS ? USB_CDC_CTRL_RTS : 0);
952
953 newctrl = (newctrl & ~clear) | set;
954
955 if (acm->ctrlout == newctrl)
956 return 0;
957 return acm_set_control(acm, acm->ctrlout = newctrl);
958 }
959
get_serial_info(struct tty_struct * tty,struct serial_struct * ss)960 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
961 {
962 struct acm *acm = tty->driver_data;
963
964 ss->line = acm->minor;
965 ss->close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
966 ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
967 ASYNC_CLOSING_WAIT_NONE :
968 jiffies_to_msecs(acm->port.closing_wait) / 10;
969 return 0;
970 }
971
set_serial_info(struct tty_struct * tty,struct serial_struct * ss)972 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
973 {
974 struct acm *acm = tty->driver_data;
975 unsigned int closing_wait, close_delay;
976 int retval = 0;
977
978 close_delay = msecs_to_jiffies(ss->close_delay * 10);
979 closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
980 ASYNC_CLOSING_WAIT_NONE :
981 msecs_to_jiffies(ss->closing_wait * 10);
982
983 mutex_lock(&acm->port.mutex);
984
985 if (!capable(CAP_SYS_ADMIN)) {
986 if ((close_delay != acm->port.close_delay) ||
987 (closing_wait != acm->port.closing_wait))
988 retval = -EPERM;
989 } else {
990 acm->port.close_delay = close_delay;
991 acm->port.closing_wait = closing_wait;
992 }
993
994 mutex_unlock(&acm->port.mutex);
995 return retval;
996 }
997
wait_serial_change(struct acm * acm,unsigned long arg)998 static int wait_serial_change(struct acm *acm, unsigned long arg)
999 {
1000 int rv = 0;
1001 DECLARE_WAITQUEUE(wait, current);
1002 struct async_icount old, new;
1003
1004 do {
1005 spin_lock_irq(&acm->read_lock);
1006 old = acm->oldcount;
1007 new = acm->iocount;
1008 acm->oldcount = new;
1009 spin_unlock_irq(&acm->read_lock);
1010
1011 if ((arg & TIOCM_DSR) &&
1012 old.dsr != new.dsr)
1013 break;
1014 if ((arg & TIOCM_CD) &&
1015 old.dcd != new.dcd)
1016 break;
1017 if ((arg & TIOCM_RI) &&
1018 old.rng != new.rng)
1019 break;
1020
1021 add_wait_queue(&acm->wioctl, &wait);
1022 set_current_state(TASK_INTERRUPTIBLE);
1023 schedule();
1024 remove_wait_queue(&acm->wioctl, &wait);
1025 if (acm->disconnected) {
1026 if (arg & TIOCM_CD)
1027 break;
1028 else
1029 rv = -ENODEV;
1030 } else {
1031 if (signal_pending(current))
1032 rv = -ERESTARTSYS;
1033 }
1034 } while (!rv);
1035
1036
1037
1038 return rv;
1039 }
1040
acm_tty_get_icount(struct tty_struct * tty,struct serial_icounter_struct * icount)1041 static int acm_tty_get_icount(struct tty_struct *tty,
1042 struct serial_icounter_struct *icount)
1043 {
1044 struct acm *acm = tty->driver_data;
1045
1046 icount->dsr = acm->iocount.dsr;
1047 icount->rng = acm->iocount.rng;
1048 icount->dcd = acm->iocount.dcd;
1049 icount->frame = acm->iocount.frame;
1050 icount->overrun = acm->iocount.overrun;
1051 icount->parity = acm->iocount.parity;
1052 icount->brk = acm->iocount.brk;
1053
1054 return 0;
1055 }
1056
acm_tty_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1057 static int acm_tty_ioctl(struct tty_struct *tty,
1058 unsigned int cmd, unsigned long arg)
1059 {
1060 struct acm *acm = tty->driver_data;
1061 int rv = -ENOIOCTLCMD;
1062
1063 switch (cmd) {
1064 case TIOCMIWAIT:
1065 rv = usb_autopm_get_interface(acm->control);
1066 if (rv < 0) {
1067 rv = -EIO;
1068 break;
1069 }
1070 rv = wait_serial_change(acm, arg);
1071 usb_autopm_put_interface(acm->control);
1072 break;
1073 }
1074
1075 return rv;
1076 }
1077
acm_tty_set_termios(struct tty_struct * tty,const struct ktermios * termios_old)1078 static void acm_tty_set_termios(struct tty_struct *tty,
1079 const struct ktermios *termios_old)
1080 {
1081 struct acm *acm = tty->driver_data;
1082 struct ktermios *termios = &tty->termios;
1083 struct usb_cdc_line_coding newline;
1084 int newctrl = acm->ctrlout;
1085
1086 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1087 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1088 newline.bParityType = termios->c_cflag & PARENB ?
1089 (termios->c_cflag & PARODD ? 1 : 2) +
1090 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1091 newline.bDataBits = tty_get_char_size(termios->c_cflag);
1092
1093 /* FIXME: Needs to clear unsupported bits in the termios */
1094 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1095
1096 if (C_BAUD(tty) == B0) {
1097 newline.dwDTERate = acm->line.dwDTERate;
1098 newctrl &= ~USB_CDC_CTRL_DTR;
1099 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1100 newctrl |= USB_CDC_CTRL_DTR;
1101 }
1102
1103 if (newctrl != acm->ctrlout)
1104 acm_set_control(acm, acm->ctrlout = newctrl);
1105
1106 if (memcmp(&acm->line, &newline, sizeof newline)) {
1107 memcpy(&acm->line, &newline, sizeof newline);
1108 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1109 __func__,
1110 le32_to_cpu(newline.dwDTERate),
1111 newline.bCharFormat, newline.bParityType,
1112 newline.bDataBits);
1113 acm_set_line(acm, &acm->line);
1114 }
1115 }
1116
1117 static const struct tty_port_operations acm_port_ops = {
1118 .dtr_rts = acm_port_dtr_rts,
1119 .shutdown = acm_port_shutdown,
1120 .activate = acm_port_activate,
1121 .destruct = acm_port_destruct,
1122 };
1123
1124 /*
1125 * USB probe and disconnect routines.
1126 */
1127
1128 /* Little helpers: write/read buffers free */
acm_write_buffers_free(struct acm * acm)1129 static void acm_write_buffers_free(struct acm *acm)
1130 {
1131 int i;
1132 struct acm_wb *wb;
1133
1134 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1135 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1136 }
1137
acm_read_buffers_free(struct acm * acm)1138 static void acm_read_buffers_free(struct acm *acm)
1139 {
1140 int i;
1141
1142 for (i = 0; i < acm->rx_buflimit; i++)
1143 usb_free_coherent(acm->dev, acm->readsize,
1144 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1145 }
1146
1147 /* Little helper: write buffers allocate */
acm_write_buffers_alloc(struct acm * acm)1148 static int acm_write_buffers_alloc(struct acm *acm)
1149 {
1150 int i;
1151 struct acm_wb *wb;
1152
1153 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1154 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1155 &wb->dmah);
1156 if (!wb->buf) {
1157 while (i != 0) {
1158 --i;
1159 --wb;
1160 usb_free_coherent(acm->dev, acm->writesize,
1161 wb->buf, wb->dmah);
1162 }
1163 return -ENOMEM;
1164 }
1165 }
1166 return 0;
1167 }
1168
acm_probe(struct usb_interface * intf,const struct usb_device_id * id)1169 static int acm_probe(struct usb_interface *intf,
1170 const struct usb_device_id *id)
1171 {
1172 struct usb_cdc_union_desc *union_header = NULL;
1173 struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1174 unsigned char *buffer = intf->altsetting->extra;
1175 int buflen = intf->altsetting->extralen;
1176 struct usb_interface *control_interface;
1177 struct usb_interface *data_interface;
1178 struct usb_endpoint_descriptor *epctrl = NULL;
1179 struct usb_endpoint_descriptor *epread = NULL;
1180 struct usb_endpoint_descriptor *epwrite = NULL;
1181 struct usb_device *usb_dev = interface_to_usbdev(intf);
1182 struct usb_cdc_parsed_header h;
1183 struct acm *acm;
1184 int minor;
1185 int ctrlsize, readsize;
1186 u8 *buf;
1187 int call_intf_num = -1;
1188 int data_intf_num = -1;
1189 unsigned long quirks;
1190 int num_rx_buf;
1191 int i;
1192 int combined_interfaces = 0;
1193 struct device *tty_dev;
1194 int rv = -ENOMEM;
1195 int res;
1196
1197 /* normal quirks */
1198 quirks = (unsigned long)id->driver_info;
1199
1200 if (quirks == IGNORE_DEVICE)
1201 return -ENODEV;
1202
1203 memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1204
1205 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1206
1207 /* handle quirks deadly to normal probing*/
1208 if (quirks == NO_UNION_NORMAL) {
1209 data_interface = usb_ifnum_to_if(usb_dev, 1);
1210 control_interface = usb_ifnum_to_if(usb_dev, 0);
1211 /* we would crash */
1212 if (!data_interface || !control_interface)
1213 return -ENODEV;
1214 goto skip_normal_probe;
1215 }
1216
1217 /* normal probing*/
1218 if (!buffer) {
1219 dev_err(&intf->dev, "Weird descriptor references\n");
1220 return -EINVAL;
1221 }
1222
1223 if (!buflen) {
1224 if (intf->cur_altsetting->endpoint &&
1225 intf->cur_altsetting->endpoint->extralen &&
1226 intf->cur_altsetting->endpoint->extra) {
1227 dev_dbg(&intf->dev,
1228 "Seeking extra descriptors on endpoint\n");
1229 buflen = intf->cur_altsetting->endpoint->extralen;
1230 buffer = intf->cur_altsetting->endpoint->extra;
1231 } else {
1232 dev_err(&intf->dev,
1233 "Zero length descriptor references\n");
1234 return -EINVAL;
1235 }
1236 }
1237
1238 cdc_parse_cdc_header(&h, intf, buffer, buflen);
1239 union_header = h.usb_cdc_union_desc;
1240 cmgmd = h.usb_cdc_call_mgmt_descriptor;
1241 if (cmgmd)
1242 call_intf_num = cmgmd->bDataInterface;
1243
1244 if (!union_header) {
1245 if (intf->cur_altsetting->desc.bNumEndpoints == 3) {
1246 dev_dbg(&intf->dev, "No union descriptor, assuming single interface\n");
1247 combined_interfaces = 1;
1248 control_interface = data_interface = intf;
1249 goto look_for_collapsed_interface;
1250 } else if (call_intf_num > 0) {
1251 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1252 data_intf_num = call_intf_num;
1253 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1254 control_interface = intf;
1255 } else {
1256 dev_dbg(&intf->dev, "No union descriptor, giving up\n");
1257 return -ENODEV;
1258 }
1259 } else {
1260 int class = -1;
1261
1262 data_intf_num = union_header->bSlaveInterface0;
1263 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1264 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1265
1266 if (control_interface)
1267 class = control_interface->cur_altsetting->desc.bInterfaceClass;
1268
1269 if (class != USB_CLASS_COMM && class != USB_CLASS_CDC_DATA) {
1270 dev_dbg(&intf->dev, "Broken union descriptor, assuming single interface\n");
1271 combined_interfaces = 1;
1272 control_interface = data_interface = intf;
1273 goto look_for_collapsed_interface;
1274 }
1275 }
1276
1277 if (!control_interface || !data_interface) {
1278 dev_dbg(&intf->dev, "no interfaces\n");
1279 return -ENODEV;
1280 }
1281
1282 if (data_intf_num != call_intf_num)
1283 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1284
1285 if (control_interface == data_interface) {
1286 /* some broken devices designed for windows work this way */
1287 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1288 combined_interfaces = 1;
1289 /* a popular other OS doesn't use it */
1290 quirks |= NO_CAP_LINE;
1291 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1292 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1293 return -EINVAL;
1294 }
1295 look_for_collapsed_interface:
1296 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1297 &epread, &epwrite, &epctrl, NULL);
1298 if (res)
1299 return res;
1300
1301 goto made_compressed_probe;
1302 }
1303
1304 skip_normal_probe:
1305
1306 /*workaround for switched interfaces */
1307 if (data_interface->cur_altsetting->desc.bInterfaceClass != USB_CLASS_CDC_DATA) {
1308 if (control_interface->cur_altsetting->desc.bInterfaceClass == USB_CLASS_CDC_DATA) {
1309 dev_dbg(&intf->dev,
1310 "Your device has switched interfaces.\n");
1311 swap(control_interface, data_interface);
1312 } else {
1313 return -EINVAL;
1314 }
1315 }
1316
1317 /* Accept probe requests only for the control interface */
1318 if (!combined_interfaces && intf != control_interface)
1319 return -ENODEV;
1320
1321 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1322 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1323 return -EINVAL;
1324
1325 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1326 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1327 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1328
1329
1330 /* workaround for switched endpoints */
1331 if (!usb_endpoint_dir_in(epread)) {
1332 /* descriptors are swapped */
1333 dev_dbg(&intf->dev,
1334 "The data interface has switched endpoints\n");
1335 swap(epread, epwrite);
1336 }
1337 made_compressed_probe:
1338 dev_dbg(&intf->dev, "interfaces are valid\n");
1339
1340 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1341 if (!acm)
1342 return -ENOMEM;
1343
1344 tty_port_init(&acm->port);
1345 acm->port.ops = &acm_port_ops;
1346
1347 ctrlsize = usb_endpoint_maxp(epctrl);
1348 readsize = usb_endpoint_maxp(epread) *
1349 (quirks == SINGLE_RX_URB ? 1 : 2);
1350 acm->combined_interfaces = combined_interfaces;
1351 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1352 acm->control = control_interface;
1353 acm->data = data_interface;
1354
1355 usb_get_intf(acm->control); /* undone in destruct() */
1356
1357 minor = acm_alloc_minor(acm);
1358 if (minor < 0) {
1359 acm->minor = ACM_MINOR_INVALID;
1360 goto err_put_port;
1361 }
1362
1363 acm->minor = minor;
1364 acm->dev = usb_dev;
1365 if (h.usb_cdc_acm_descriptor)
1366 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1367 if (quirks & NO_CAP_LINE)
1368 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1369 acm->ctrlsize = ctrlsize;
1370 acm->readsize = readsize;
1371 acm->rx_buflimit = num_rx_buf;
1372 INIT_DELAYED_WORK(&acm->dwork, acm_softint);
1373 init_waitqueue_head(&acm->wioctl);
1374 spin_lock_init(&acm->write_lock);
1375 spin_lock_init(&acm->read_lock);
1376 mutex_init(&acm->mutex);
1377 if (usb_endpoint_xfer_int(epread)) {
1378 acm->bInterval = epread->bInterval;
1379 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1380 } else {
1381 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1382 }
1383 if (usb_endpoint_xfer_int(epwrite))
1384 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1385 else
1386 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1387 init_usb_anchor(&acm->delayed);
1388 acm->quirks = quirks;
1389
1390 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1391 if (!buf)
1392 goto err_put_port;
1393 acm->ctrl_buffer = buf;
1394
1395 if (acm_write_buffers_alloc(acm) < 0)
1396 goto err_free_ctrl_buffer;
1397
1398 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1399 if (!acm->ctrlurb)
1400 goto err_free_write_buffers;
1401
1402 for (i = 0; i < num_rx_buf; i++) {
1403 struct acm_rb *rb = &(acm->read_buffers[i]);
1404 struct urb *urb;
1405
1406 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1407 &rb->dma);
1408 if (!rb->base)
1409 goto err_free_read_urbs;
1410 rb->index = i;
1411 rb->instance = acm;
1412
1413 urb = usb_alloc_urb(0, GFP_KERNEL);
1414 if (!urb)
1415 goto err_free_read_urbs;
1416
1417 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1418 urb->transfer_dma = rb->dma;
1419 if (usb_endpoint_xfer_int(epread))
1420 usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1421 acm->readsize,
1422 acm_read_bulk_callback, rb,
1423 acm->bInterval);
1424 else
1425 usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1426 acm->readsize,
1427 acm_read_bulk_callback, rb);
1428
1429 acm->read_urbs[i] = urb;
1430 __set_bit(i, &acm->read_urbs_free);
1431 }
1432 for (i = 0; i < ACM_NW; i++) {
1433 struct acm_wb *snd = &(acm->wb[i]);
1434
1435 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1436 if (!snd->urb)
1437 goto err_free_write_urbs;
1438
1439 if (usb_endpoint_xfer_int(epwrite))
1440 usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1441 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1442 else
1443 usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1444 NULL, acm->writesize, acm_write_bulk, snd);
1445 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1446 if (quirks & SEND_ZERO_PACKET)
1447 snd->urb->transfer_flags |= URB_ZERO_PACKET;
1448 snd->instance = acm;
1449 }
1450
1451 usb_set_intfdata(intf, acm);
1452
1453 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1454 if (i < 0)
1455 goto err_free_write_urbs;
1456
1457 if (h.usb_cdc_country_functional_desc) { /* export the country data */
1458 struct usb_cdc_country_functional_desc * cfd =
1459 h.usb_cdc_country_functional_desc;
1460
1461 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1462 if (!acm->country_codes)
1463 goto skip_countries;
1464 acm->country_code_size = cfd->bLength - 4;
1465 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1466 cfd->bLength - 4);
1467 acm->country_rel_date = cfd->iCountryCodeRelDate;
1468
1469 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1470 if (i < 0) {
1471 kfree(acm->country_codes);
1472 acm->country_codes = NULL;
1473 acm->country_code_size = 0;
1474 goto skip_countries;
1475 }
1476
1477 i = device_create_file(&intf->dev,
1478 &dev_attr_iCountryCodeRelDate);
1479 if (i < 0) {
1480 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1481 kfree(acm->country_codes);
1482 acm->country_codes = NULL;
1483 acm->country_code_size = 0;
1484 goto skip_countries;
1485 }
1486 }
1487
1488 skip_countries:
1489 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1490 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1491 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1492 /* works around buggy devices */
1493 epctrl->bInterval ? epctrl->bInterval : 16);
1494 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1495 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1496 acm->notification_buffer = NULL;
1497 acm->nb_index = 0;
1498 acm->nb_size = 0;
1499
1500 acm->line.dwDTERate = cpu_to_le32(9600);
1501 acm->line.bDataBits = 8;
1502 acm_set_line(acm, &acm->line);
1503
1504 if (!acm->combined_interfaces) {
1505 rv = usb_driver_claim_interface(&acm_driver, data_interface, acm);
1506 if (rv)
1507 goto err_remove_files;
1508 }
1509
1510 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1511 &control_interface->dev);
1512 if (IS_ERR(tty_dev)) {
1513 rv = PTR_ERR(tty_dev);
1514 goto err_release_data_interface;
1515 }
1516
1517 if (quirks & CLEAR_HALT_CONDITIONS) {
1518 usb_clear_halt(usb_dev, acm->in);
1519 usb_clear_halt(usb_dev, acm->out);
1520 }
1521
1522 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1523
1524 return 0;
1525
1526 err_release_data_interface:
1527 if (!acm->combined_interfaces) {
1528 /* Clear driver data so that disconnect() returns early. */
1529 usb_set_intfdata(data_interface, NULL);
1530 usb_driver_release_interface(&acm_driver, data_interface);
1531 }
1532 err_remove_files:
1533 if (acm->country_codes) {
1534 device_remove_file(&acm->control->dev,
1535 &dev_attr_wCountryCodes);
1536 device_remove_file(&acm->control->dev,
1537 &dev_attr_iCountryCodeRelDate);
1538 }
1539 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1540 err_free_write_urbs:
1541 for (i = 0; i < ACM_NW; i++)
1542 usb_free_urb(acm->wb[i].urb);
1543 err_free_read_urbs:
1544 for (i = 0; i < num_rx_buf; i++)
1545 usb_free_urb(acm->read_urbs[i]);
1546 acm_read_buffers_free(acm);
1547 usb_free_urb(acm->ctrlurb);
1548 err_free_write_buffers:
1549 acm_write_buffers_free(acm);
1550 err_free_ctrl_buffer:
1551 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1552 err_put_port:
1553 tty_port_put(&acm->port);
1554
1555 return rv;
1556 }
1557
acm_disconnect(struct usb_interface * intf)1558 static void acm_disconnect(struct usb_interface *intf)
1559 {
1560 struct acm *acm = usb_get_intfdata(intf);
1561 struct tty_struct *tty;
1562 int i;
1563
1564 /* sibling interface is already cleaning up */
1565 if (!acm)
1566 return;
1567
1568 acm->disconnected = true;
1569 /*
1570 * there is a circular dependency. acm_softint() can resubmit
1571 * the URBs in error handling so we need to block any
1572 * submission right away
1573 */
1574 acm_poison_urbs(acm);
1575 mutex_lock(&acm->mutex);
1576 if (acm->country_codes) {
1577 device_remove_file(&acm->control->dev,
1578 &dev_attr_wCountryCodes);
1579 device_remove_file(&acm->control->dev,
1580 &dev_attr_iCountryCodeRelDate);
1581 }
1582 wake_up_all(&acm->wioctl);
1583 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1584 usb_set_intfdata(acm->control, NULL);
1585 usb_set_intfdata(acm->data, NULL);
1586 mutex_unlock(&acm->mutex);
1587
1588 tty = tty_port_tty_get(&acm->port);
1589 if (tty) {
1590 tty_vhangup(tty);
1591 tty_kref_put(tty);
1592 }
1593
1594 cancel_delayed_work_sync(&acm->dwork);
1595
1596 tty_unregister_device(acm_tty_driver, acm->minor);
1597
1598 usb_free_urb(acm->ctrlurb);
1599 for (i = 0; i < ACM_NW; i++)
1600 usb_free_urb(acm->wb[i].urb);
1601 for (i = 0; i < acm->rx_buflimit; i++)
1602 usb_free_urb(acm->read_urbs[i]);
1603 acm_write_buffers_free(acm);
1604 usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1605 acm_read_buffers_free(acm);
1606
1607 kfree(acm->notification_buffer);
1608
1609 if (!acm->combined_interfaces)
1610 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1611 acm->data : acm->control);
1612
1613 tty_port_put(&acm->port);
1614 }
1615
1616 #ifdef CONFIG_PM
acm_suspend(struct usb_interface * intf,pm_message_t message)1617 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1618 {
1619 struct acm *acm = usb_get_intfdata(intf);
1620 int cnt;
1621
1622 spin_lock_irq(&acm->write_lock);
1623 if (PMSG_IS_AUTO(message)) {
1624 if (acm->transmitting) {
1625 spin_unlock_irq(&acm->write_lock);
1626 return -EBUSY;
1627 }
1628 }
1629 cnt = acm->susp_count++;
1630 spin_unlock_irq(&acm->write_lock);
1631
1632 if (cnt)
1633 return 0;
1634
1635 acm_poison_urbs(acm);
1636 cancel_delayed_work_sync(&acm->dwork);
1637 acm->urbs_in_error_delay = 0;
1638
1639 return 0;
1640 }
1641
acm_resume(struct usb_interface * intf)1642 static int acm_resume(struct usb_interface *intf)
1643 {
1644 struct acm *acm = usb_get_intfdata(intf);
1645 struct urb *urb;
1646 int rv = 0;
1647
1648 spin_lock_irq(&acm->write_lock);
1649
1650 if (--acm->susp_count)
1651 goto out;
1652
1653 acm_unpoison_urbs(acm);
1654
1655 if (tty_port_initialized(&acm->port)) {
1656 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1657
1658 for (;;) {
1659 urb = usb_get_from_anchor(&acm->delayed);
1660 if (!urb)
1661 break;
1662
1663 acm_start_wb(acm, urb->context);
1664 }
1665
1666 /*
1667 * delayed error checking because we must
1668 * do the write path at all cost
1669 */
1670 if (rv < 0)
1671 goto out;
1672
1673 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1674 }
1675 out:
1676 spin_unlock_irq(&acm->write_lock);
1677
1678 return rv;
1679 }
1680
acm_reset_resume(struct usb_interface * intf)1681 static int acm_reset_resume(struct usb_interface *intf)
1682 {
1683 struct acm *acm = usb_get_intfdata(intf);
1684
1685 if (tty_port_initialized(&acm->port))
1686 tty_port_tty_hangup(&acm->port, false);
1687
1688 return acm_resume(intf);
1689 }
1690
1691 #endif /* CONFIG_PM */
1692
acm_pre_reset(struct usb_interface * intf)1693 static int acm_pre_reset(struct usb_interface *intf)
1694 {
1695 struct acm *acm = usb_get_intfdata(intf);
1696
1697 clear_bit(EVENT_RX_STALL, &acm->flags);
1698 acm->nb_index = 0; /* pending control transfers are lost */
1699
1700 return 0;
1701 }
1702
1703 #define NOKIA_PCSUITE_ACM_INFO(x) \
1704 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1705 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1706 USB_CDC_ACM_PROTO_VENDOR)
1707
1708 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1709 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1710 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1711 USB_CDC_ACM_PROTO_VENDOR)
1712
1713 /*
1714 * USB driver structure.
1715 */
1716
1717 static const struct usb_device_id acm_ids[] = {
1718 /* quirky and broken devices */
1719 { USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1720 .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
1721 { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1722 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1723 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1724 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1725 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1726 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1727 },
1728 { USB_DEVICE(0x045b, 0x023c), /* Renesas USB Download mode */
1729 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1730 },
1731 { USB_DEVICE(0x045b, 0x0248), /* Renesas USB Download mode */
1732 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1733 },
1734 { USB_DEVICE(0x045b, 0x024D), /* Renesas USB Download mode */
1735 .driver_info = DISABLE_ECHO, /* Don't echo banner */
1736 },
1737 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1738 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1739 },
1740 { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1741 .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1742 },
1743 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1744 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1745 },
1746 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1747 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1748 },
1749 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1750 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1751 },
1752 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1753 .driver_info = SINGLE_RX_URB,
1754 },
1755 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1756 .driver_info = SINGLE_RX_URB, /* firmware bug */
1757 },
1758 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1759 .driver_info = SINGLE_RX_URB, /* firmware bug */
1760 },
1761 { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1762 .driver_info = SINGLE_RX_URB,
1763 },
1764 { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1765 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1766 },
1767 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1768 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1769 },
1770 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1771 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1772 },
1773 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1774 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1775 },
1776 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1777 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1778 },
1779 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1780 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1781 },
1782 { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1783 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1784 },
1785 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1786 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1787 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1788 { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1789 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1790 },
1791 /* Motorola H24 HSPA module: */
1792 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1793 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1794 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1795 },
1796 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1797 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1798 },
1799 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1800 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1801 },
1802 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1803 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1804 },
1805 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1806 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1807 },
1808 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1809 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1810 },
1811 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1812 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1813 },
1814
1815 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1816 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1817 data interface instead of
1818 communications interface.
1819 Maybe we should define a new
1820 quirk for this. */
1821 },
1822 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1823 .driver_info = NO_UNION_NORMAL,
1824 },
1825 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1826 .driver_info = NO_UNION_NORMAL,
1827 },
1828 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1829 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1830 },
1831 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1832 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1833 },
1834 { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1835 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1836 },
1837 { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1838 .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1839 },
1840 { USB_DEVICE(0x0c26, 0x0020), /* Icom ICF3400 Serie */
1841 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1842 },
1843 { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1844 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1845 },
1846
1847 { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1848 .driver_info = CLEAR_HALT_CONDITIONS,
1849 },
1850
1851 /* Nokia S60 phones expose two ACM channels. The first is
1852 * a modem and is picked up by the standard AT-command
1853 * information below. The second is 'vendor-specific' but
1854 * is treated as a serial device at the S60 end, so we want
1855 * to expose it on Linux too. */
1856 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1857 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1858 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1859 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1860 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1861 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1862 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1863 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1864 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1865 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1866 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1867 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1868 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1869 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1870 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1871 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1872 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1873 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1874 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1875 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1876 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1877 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1878 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1879 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1880 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1881 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1882 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1883 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1884 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1885 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1886 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1887 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1888 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1889 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1890 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1891 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1892 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1893 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1894 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1895 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1896 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1897 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1898 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1899 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1900 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1901 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1902 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1903 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1904 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1905 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1906 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1907 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1908 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1909 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1910 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1911 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1912 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1913
1914 /* Support for Owen devices */
1915 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1916
1917 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1918
1919 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1920 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1921 .driver_info = IGNORE_DEVICE,
1922 },
1923 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1924 .driver_info = IGNORE_DEVICE,
1925 },
1926 #endif
1927
1928 #if IS_ENABLED(CONFIG_IR_TOY)
1929 { USB_DEVICE(0x04d8, 0xfd08),
1930 .driver_info = IGNORE_DEVICE,
1931 },
1932
1933 { USB_DEVICE(0x04d8, 0xf58b),
1934 .driver_info = IGNORE_DEVICE,
1935 },
1936 #endif
1937
1938 #if IS_ENABLED(CONFIG_USB_SERIAL_XR)
1939 { USB_DEVICE(0x04e2, 0x1400), .driver_info = IGNORE_DEVICE },
1940 { USB_DEVICE(0x04e2, 0x1401), .driver_info = IGNORE_DEVICE },
1941 { USB_DEVICE(0x04e2, 0x1402), .driver_info = IGNORE_DEVICE },
1942 { USB_DEVICE(0x04e2, 0x1403), .driver_info = IGNORE_DEVICE },
1943 { USB_DEVICE(0x04e2, 0x1410), .driver_info = IGNORE_DEVICE },
1944 { USB_DEVICE(0x04e2, 0x1411), .driver_info = IGNORE_DEVICE },
1945 { USB_DEVICE(0x04e2, 0x1412), .driver_info = IGNORE_DEVICE },
1946 { USB_DEVICE(0x04e2, 0x1414), .driver_info = IGNORE_DEVICE },
1947 { USB_DEVICE(0x04e2, 0x1420), .driver_info = IGNORE_DEVICE },
1948 { USB_DEVICE(0x04e2, 0x1422), .driver_info = IGNORE_DEVICE },
1949 { USB_DEVICE(0x04e2, 0x1424), .driver_info = IGNORE_DEVICE },
1950 #endif
1951
1952 /*Samsung phone in firmware update mode */
1953 { USB_DEVICE(0x04e8, 0x685d),
1954 .driver_info = IGNORE_DEVICE,
1955 },
1956
1957 /* Exclude Infineon Flash Loader utility */
1958 { USB_DEVICE(0x058b, 0x0041),
1959 .driver_info = IGNORE_DEVICE,
1960 },
1961
1962 /* Exclude ETAS ES58x */
1963 { USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
1964 .driver_info = IGNORE_DEVICE,
1965 },
1966 { USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
1967 .driver_info = IGNORE_DEVICE,
1968 },
1969 { USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
1970 .driver_info = IGNORE_DEVICE,
1971 },
1972
1973 { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1974 .driver_info = SEND_ZERO_PACKET,
1975 },
1976 { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1977 .driver_info = SEND_ZERO_PACKET,
1978 },
1979
1980 /* Exclude Goodix Fingerprint Reader */
1981 { USB_DEVICE(0x27c6, 0x5395),
1982 .driver_info = IGNORE_DEVICE,
1983 },
1984
1985 /* Exclude Heimann Sensor GmbH USB appset demo */
1986 { USB_DEVICE(0x32a7, 0x0000),
1987 .driver_info = IGNORE_DEVICE,
1988 },
1989
1990 /* control interfaces without any protocol set */
1991 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1992 USB_CDC_PROTO_NONE) },
1993
1994 /* control interfaces with various AT-command sets */
1995 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1996 USB_CDC_ACM_PROTO_AT_V25TER) },
1997 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1998 USB_CDC_ACM_PROTO_AT_PCCA101) },
1999 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
2000 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
2001 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
2002 USB_CDC_ACM_PROTO_AT_GSM) },
2003 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
2004 USB_CDC_ACM_PROTO_AT_3G) },
2005 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
2006 USB_CDC_ACM_PROTO_AT_CDMA) },
2007
2008 { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
2009 .driver_info = SEND_ZERO_PACKET,
2010 },
2011
2012 { }
2013 };
2014
2015 MODULE_DEVICE_TABLE(usb, acm_ids);
2016
2017 static struct usb_driver acm_driver = {
2018 .name = "cdc_acm",
2019 .probe = acm_probe,
2020 .disconnect = acm_disconnect,
2021 #ifdef CONFIG_PM
2022 .suspend = acm_suspend,
2023 .resume = acm_resume,
2024 .reset_resume = acm_reset_resume,
2025 #endif
2026 .pre_reset = acm_pre_reset,
2027 .id_table = acm_ids,
2028 #ifdef CONFIG_PM
2029 .supports_autosuspend = 1,
2030 #endif
2031 .disable_hub_initiated_lpm = 1,
2032 };
2033
2034 /*
2035 * TTY driver structures.
2036 */
2037
2038 static const struct tty_operations acm_ops = {
2039 .install = acm_tty_install,
2040 .open = acm_tty_open,
2041 .close = acm_tty_close,
2042 .cleanup = acm_tty_cleanup,
2043 .hangup = acm_tty_hangup,
2044 .write = acm_tty_write,
2045 .write_room = acm_tty_write_room,
2046 .flush_buffer = acm_tty_flush_buffer,
2047 .ioctl = acm_tty_ioctl,
2048 .throttle = acm_tty_throttle,
2049 .unthrottle = acm_tty_unthrottle,
2050 .chars_in_buffer = acm_tty_chars_in_buffer,
2051 .break_ctl = acm_tty_break_ctl,
2052 .set_termios = acm_tty_set_termios,
2053 .tiocmget = acm_tty_tiocmget,
2054 .tiocmset = acm_tty_tiocmset,
2055 .get_serial = get_serial_info,
2056 .set_serial = set_serial_info,
2057 .get_icount = acm_tty_get_icount,
2058 };
2059
2060 /*
2061 * Init / exit.
2062 */
2063
acm_init(void)2064 static int __init acm_init(void)
2065 {
2066 int retval;
2067 acm_tty_driver = tty_alloc_driver(ACM_TTY_MINORS, TTY_DRIVER_REAL_RAW |
2068 TTY_DRIVER_DYNAMIC_DEV);
2069 if (IS_ERR(acm_tty_driver))
2070 return PTR_ERR(acm_tty_driver);
2071 acm_tty_driver->driver_name = "acm",
2072 acm_tty_driver->name = "ttyACM",
2073 acm_tty_driver->major = ACM_TTY_MAJOR,
2074 acm_tty_driver->minor_start = 0,
2075 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2076 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2077 acm_tty_driver->init_termios = tty_std_termios;
2078 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2079 HUPCL | CLOCAL;
2080 tty_set_operations(acm_tty_driver, &acm_ops);
2081
2082 retval = tty_register_driver(acm_tty_driver);
2083 if (retval) {
2084 tty_driver_kref_put(acm_tty_driver);
2085 return retval;
2086 }
2087
2088 retval = usb_register(&acm_driver);
2089 if (retval) {
2090 tty_unregister_driver(acm_tty_driver);
2091 tty_driver_kref_put(acm_tty_driver);
2092 return retval;
2093 }
2094
2095 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2096
2097 return 0;
2098 }
2099
acm_exit(void)2100 static void __exit acm_exit(void)
2101 {
2102 usb_deregister(&acm_driver);
2103 tty_unregister_driver(acm_tty_driver);
2104 tty_driver_kref_put(acm_tty_driver);
2105 idr_destroy(&acm_minors);
2106 }
2107
2108 module_init(acm_init);
2109 module_exit(acm_exit);
2110
2111 MODULE_AUTHOR(DRIVER_AUTHOR);
2112 MODULE_DESCRIPTION(DRIVER_DESC);
2113 MODULE_LICENSE("GPL");
2114 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
2115