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 if (acm->nb_size) {
382 kfree(acm->notification_buffer);
383 acm->nb_size = 0;
384 }
385 alloc_size = roundup_pow_of_two(expected_size);
386 /*
387 * kmalloc ensures a valid notification_buffer after a
388 * use of kfree in case the previous allocation was too
389 * small. Final freeing is done on disconnect.
390 */
391 acm->notification_buffer =
392 kmalloc(alloc_size, GFP_ATOMIC);
393 if (!acm->notification_buffer)
394 goto exit;
395 acm->nb_size = alloc_size;
396 }
397
398 copy_size = min(current_size,
399 expected_size - acm->nb_index);
400
401 memcpy(&acm->notification_buffer[acm->nb_index],
402 urb->transfer_buffer, copy_size);
403 acm->nb_index += copy_size;
404 current_size = acm->nb_index;
405 }
406
407 if (current_size >= expected_size) {
408 /* notification complete */
409 acm_process_notification(acm, (unsigned char *)dr);
410 acm->nb_index = 0;
411 }
412
413 exit:
414 retval = usb_submit_urb(urb, GFP_ATOMIC);
415 if (retval && retval != -EPERM)
416 dev_err(&acm->control->dev,
417 "%s - usb_submit_urb failed: %d\n", __func__, retval);
418 }
419
acm_submit_read_urb(struct acm * acm,int index,gfp_t mem_flags)420 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
421 {
422 int res;
423
424 if (!test_and_clear_bit(index, &acm->read_urbs_free))
425 return 0;
426
427 res = usb_submit_urb(acm->read_urbs[index], mem_flags);
428 if (res) {
429 if (res != -EPERM && res != -ENODEV) {
430 dev_err(&acm->data->dev,
431 "urb %d failed submission with %d\n",
432 index, res);
433 }
434 set_bit(index, &acm->read_urbs_free);
435 return res;
436 } else {
437 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
438 }
439
440 return 0;
441 }
442
acm_submit_read_urbs(struct acm * acm,gfp_t mem_flags)443 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
444 {
445 int res;
446 int i;
447
448 for (i = 0; i < acm->rx_buflimit; ++i) {
449 res = acm_submit_read_urb(acm, i, mem_flags);
450 if (res)
451 return res;
452 }
453
454 return 0;
455 }
456
acm_process_read_urb(struct acm * acm,struct urb * urb)457 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
458 {
459 if (!urb->actual_length)
460 return;
461
462 tty_insert_flip_string(&acm->port, urb->transfer_buffer,
463 urb->actual_length);
464 tty_flip_buffer_push(&acm->port);
465 }
466
acm_read_bulk_callback(struct urb * urb)467 static void acm_read_bulk_callback(struct urb *urb)
468 {
469 struct acm_rb *rb = urb->context;
470 struct acm *acm = rb->instance;
471 unsigned long flags;
472 int status = urb->status;
473
474 dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
475 rb->index, urb->actual_length, status);
476
477 set_bit(rb->index, &acm->read_urbs_free);
478
479 if (!acm->dev) {
480 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
481 return;
482 }
483
484 switch (status) {
485 case 0:
486 usb_mark_last_busy(acm->dev);
487 acm_process_read_urb(acm, urb);
488 break;
489 case -EPIPE:
490 set_bit(EVENT_RX_STALL, &acm->flags);
491 schedule_work(&acm->work);
492 return;
493 case -ENOENT:
494 case -ECONNRESET:
495 case -ESHUTDOWN:
496 dev_dbg(&acm->data->dev,
497 "%s - urb shutting down with status: %d\n",
498 __func__, status);
499 return;
500 default:
501 dev_dbg(&acm->data->dev,
502 "%s - nonzero urb status received: %d\n",
503 __func__, status);
504 break;
505 }
506
507 /*
508 * Unthrottle may run on another CPU which needs to see events
509 * in the same order. Submission has an implict barrier
510 */
511 smp_mb__before_atomic();
512
513 /* throttle device if requested by tty */
514 spin_lock_irqsave(&acm->read_lock, flags);
515 acm->throttled = acm->throttle_req;
516 if (!acm->throttled) {
517 spin_unlock_irqrestore(&acm->read_lock, flags);
518 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
519 } else {
520 spin_unlock_irqrestore(&acm->read_lock, flags);
521 }
522 }
523
524 /* data interface wrote those outgoing bytes */
acm_write_bulk(struct urb * urb)525 static void acm_write_bulk(struct urb *urb)
526 {
527 struct acm_wb *wb = urb->context;
528 struct acm *acm = wb->instance;
529 unsigned long flags;
530 int status = urb->status;
531
532 if (status || (urb->actual_length != urb->transfer_buffer_length))
533 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
534 urb->actual_length,
535 urb->transfer_buffer_length,
536 status);
537
538 spin_lock_irqsave(&acm->write_lock, flags);
539 acm_write_done(acm, wb);
540 spin_unlock_irqrestore(&acm->write_lock, flags);
541 set_bit(EVENT_TTY_WAKEUP, &acm->flags);
542 schedule_work(&acm->work);
543 }
544
acm_softint(struct work_struct * work)545 static void acm_softint(struct work_struct *work)
546 {
547 int i;
548 struct acm *acm = container_of(work, struct acm, work);
549
550 if (test_bit(EVENT_RX_STALL, &acm->flags)) {
551 if (!(usb_autopm_get_interface(acm->data))) {
552 for (i = 0; i < acm->rx_buflimit; i++)
553 usb_kill_urb(acm->read_urbs[i]);
554 usb_clear_halt(acm->dev, acm->in);
555 acm_submit_read_urbs(acm, GFP_KERNEL);
556 usb_autopm_put_interface(acm->data);
557 }
558 clear_bit(EVENT_RX_STALL, &acm->flags);
559 }
560
561 if (test_bit(EVENT_TTY_WAKEUP, &acm->flags)) {
562 tty_port_tty_wakeup(&acm->port);
563 clear_bit(EVENT_TTY_WAKEUP, &acm->flags);
564 }
565 }
566
567 /*
568 * TTY handlers
569 */
570
acm_tty_install(struct tty_driver * driver,struct tty_struct * tty)571 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
572 {
573 struct acm *acm;
574 int retval;
575
576 acm = acm_get_by_minor(tty->index);
577 if (!acm)
578 return -ENODEV;
579
580 retval = tty_standard_install(driver, tty);
581 if (retval)
582 goto error_init_termios;
583
584 tty->driver_data = acm;
585
586 return 0;
587
588 error_init_termios:
589 tty_port_put(&acm->port);
590 return retval;
591 }
592
acm_tty_open(struct tty_struct * tty,struct file * filp)593 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
594 {
595 struct acm *acm = tty->driver_data;
596
597 return tty_port_open(&acm->port, tty, filp);
598 }
599
acm_port_dtr_rts(struct tty_port * port,int raise)600 static void acm_port_dtr_rts(struct tty_port *port, int raise)
601 {
602 struct acm *acm = container_of(port, struct acm, port);
603 int val;
604 int res;
605
606 if (raise)
607 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
608 else
609 val = 0;
610
611 /* FIXME: add missing ctrlout locking throughout driver */
612 acm->ctrlout = val;
613
614 res = acm_set_control(acm, val);
615 if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
616 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
617 }
618
acm_port_activate(struct tty_port * port,struct tty_struct * tty)619 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
620 {
621 struct acm *acm = container_of(port, struct acm, port);
622 int retval = -ENODEV;
623 int i;
624
625 mutex_lock(&acm->mutex);
626 if (acm->disconnected)
627 goto disconnected;
628
629 retval = usb_autopm_get_interface(acm->control);
630 if (retval)
631 goto error_get_interface;
632
633 /*
634 * FIXME: Why do we need this? Allocating 64K of physically contiguous
635 * memory is really nasty...
636 */
637 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
638 acm->control->needs_remote_wakeup = 1;
639
640 acm->ctrlurb->dev = acm->dev;
641 retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
642 if (retval) {
643 dev_err(&acm->control->dev,
644 "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
645 goto error_submit_urb;
646 }
647
648 acm_tty_set_termios(tty, NULL);
649
650 /*
651 * Unthrottle device in case the TTY was closed while throttled.
652 */
653 spin_lock_irq(&acm->read_lock);
654 acm->throttled = 0;
655 acm->throttle_req = 0;
656 spin_unlock_irq(&acm->read_lock);
657
658 retval = acm_submit_read_urbs(acm, GFP_KERNEL);
659 if (retval)
660 goto error_submit_read_urbs;
661
662 usb_autopm_put_interface(acm->control);
663
664 mutex_unlock(&acm->mutex);
665
666 return 0;
667
668 error_submit_read_urbs:
669 for (i = 0; i < acm->rx_buflimit; i++)
670 usb_kill_urb(acm->read_urbs[i]);
671 usb_kill_urb(acm->ctrlurb);
672 error_submit_urb:
673 usb_autopm_put_interface(acm->control);
674 error_get_interface:
675 disconnected:
676 mutex_unlock(&acm->mutex);
677
678 return usb_translate_errors(retval);
679 }
680
acm_port_destruct(struct tty_port * port)681 static void acm_port_destruct(struct tty_port *port)
682 {
683 struct acm *acm = container_of(port, struct acm, port);
684
685 acm_release_minor(acm);
686 usb_put_intf(acm->control);
687 kfree(acm->country_codes);
688 kfree(acm);
689 }
690
acm_port_shutdown(struct tty_port * port)691 static void acm_port_shutdown(struct tty_port *port)
692 {
693 struct acm *acm = container_of(port, struct acm, port);
694 struct urb *urb;
695 struct acm_wb *wb;
696
697 /*
698 * Need to grab write_lock to prevent race with resume, but no need to
699 * hold it due to the tty-port initialised flag.
700 */
701 spin_lock_irq(&acm->write_lock);
702 spin_unlock_irq(&acm->write_lock);
703
704 usb_autopm_get_interface_no_resume(acm->control);
705 acm->control->needs_remote_wakeup = 0;
706 usb_autopm_put_interface(acm->control);
707
708 for (;;) {
709 urb = usb_get_from_anchor(&acm->delayed);
710 if (!urb)
711 break;
712 wb = urb->context;
713 wb->use = 0;
714 usb_autopm_put_interface_async(acm->control);
715 }
716
717 acm_kill_urbs(acm);
718 }
719
acm_tty_cleanup(struct tty_struct * tty)720 static void acm_tty_cleanup(struct tty_struct *tty)
721 {
722 struct acm *acm = tty->driver_data;
723
724 tty_port_put(&acm->port);
725 }
726
acm_tty_hangup(struct tty_struct * tty)727 static void acm_tty_hangup(struct tty_struct *tty)
728 {
729 struct acm *acm = tty->driver_data;
730
731 tty_port_hangup(&acm->port);
732 }
733
acm_tty_close(struct tty_struct * tty,struct file * filp)734 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
735 {
736 struct acm *acm = tty->driver_data;
737
738 tty_port_close(&acm->port, tty, filp);
739 }
740
acm_tty_write(struct tty_struct * tty,const unsigned char * buf,int count)741 static int acm_tty_write(struct tty_struct *tty,
742 const unsigned char *buf, int count)
743 {
744 struct acm *acm = tty->driver_data;
745 int stat;
746 unsigned long flags;
747 int wbn;
748 struct acm_wb *wb;
749
750 if (!count)
751 return 0;
752
753 dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
754
755 spin_lock_irqsave(&acm->write_lock, flags);
756 wbn = acm_wb_alloc(acm);
757 if (wbn < 0) {
758 spin_unlock_irqrestore(&acm->write_lock, flags);
759 return 0;
760 }
761 wb = &acm->wb[wbn];
762
763 if (!acm->dev) {
764 wb->use = 0;
765 spin_unlock_irqrestore(&acm->write_lock, flags);
766 return -ENODEV;
767 }
768
769 count = (count > acm->writesize) ? acm->writesize : count;
770 dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
771 memcpy(wb->buf, buf, count);
772 wb->len = count;
773
774 stat = usb_autopm_get_interface_async(acm->control);
775 if (stat) {
776 wb->use = 0;
777 spin_unlock_irqrestore(&acm->write_lock, flags);
778 return stat;
779 }
780
781 if (acm->susp_count) {
782 usb_anchor_urb(wb->urb, &acm->delayed);
783 spin_unlock_irqrestore(&acm->write_lock, flags);
784 return count;
785 }
786
787 stat = acm_start_wb(acm, wb);
788 spin_unlock_irqrestore(&acm->write_lock, flags);
789
790 if (stat < 0)
791 return stat;
792 return count;
793 }
794
acm_tty_write_room(struct tty_struct * tty)795 static int acm_tty_write_room(struct tty_struct *tty)
796 {
797 struct acm *acm = tty->driver_data;
798 /*
799 * Do not let the line discipline to know that we have a reserve,
800 * or it might get too enthusiastic.
801 */
802 return acm_wb_is_avail(acm) ? acm->writesize : 0;
803 }
804
acm_tty_chars_in_buffer(struct tty_struct * tty)805 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
806 {
807 struct acm *acm = tty->driver_data;
808 /*
809 * if the device was unplugged then any remaining characters fell out
810 * of the connector ;)
811 */
812 if (acm->disconnected)
813 return 0;
814 /*
815 * This is inaccurate (overcounts), but it works.
816 */
817 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
818 }
819
acm_tty_throttle(struct tty_struct * tty)820 static void acm_tty_throttle(struct tty_struct *tty)
821 {
822 struct acm *acm = tty->driver_data;
823
824 spin_lock_irq(&acm->read_lock);
825 acm->throttle_req = 1;
826 spin_unlock_irq(&acm->read_lock);
827 }
828
acm_tty_unthrottle(struct tty_struct * tty)829 static void acm_tty_unthrottle(struct tty_struct *tty)
830 {
831 struct acm *acm = tty->driver_data;
832 unsigned int was_throttled;
833
834 spin_lock_irq(&acm->read_lock);
835 was_throttled = acm->throttled;
836 acm->throttled = 0;
837 acm->throttle_req = 0;
838 spin_unlock_irq(&acm->read_lock);
839
840 if (was_throttled)
841 acm_submit_read_urbs(acm, GFP_KERNEL);
842 }
843
acm_tty_break_ctl(struct tty_struct * tty,int state)844 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
845 {
846 struct acm *acm = tty->driver_data;
847 int retval;
848
849 retval = acm_send_break(acm, state ? 0xffff : 0);
850 if (retval < 0)
851 dev_dbg(&acm->control->dev,
852 "%s - send break failed\n", __func__);
853 return retval;
854 }
855
acm_tty_tiocmget(struct tty_struct * tty)856 static int acm_tty_tiocmget(struct tty_struct *tty)
857 {
858 struct acm *acm = tty->driver_data;
859
860 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
861 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
862 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
863 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
864 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
865 TIOCM_CTS;
866 }
867
acm_tty_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)868 static int acm_tty_tiocmset(struct tty_struct *tty,
869 unsigned int set, unsigned int clear)
870 {
871 struct acm *acm = tty->driver_data;
872 unsigned int newctrl;
873
874 newctrl = acm->ctrlout;
875 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
876 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
877 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
878 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
879
880 newctrl = (newctrl & ~clear) | set;
881
882 if (acm->ctrlout == newctrl)
883 return 0;
884 return acm_set_control(acm, acm->ctrlout = newctrl);
885 }
886
get_serial_info(struct acm * acm,struct serial_struct __user * info)887 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
888 {
889 struct serial_struct tmp;
890
891 memset(&tmp, 0, sizeof(tmp));
892 tmp.xmit_fifo_size = acm->writesize;
893 tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
894 tmp.close_delay = acm->port.close_delay / 10;
895 tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
896 ASYNC_CLOSING_WAIT_NONE :
897 acm->port.closing_wait / 10;
898
899 if (copy_to_user(info, &tmp, sizeof(tmp)))
900 return -EFAULT;
901 else
902 return 0;
903 }
904
set_serial_info(struct acm * acm,struct serial_struct __user * newinfo)905 static int set_serial_info(struct acm *acm,
906 struct serial_struct __user *newinfo)
907 {
908 struct serial_struct new_serial;
909 unsigned int closing_wait, close_delay;
910 int retval = 0;
911
912 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
913 return -EFAULT;
914
915 close_delay = new_serial.close_delay * 10;
916 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
917 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
918
919 mutex_lock(&acm->port.mutex);
920
921 if (!capable(CAP_SYS_ADMIN)) {
922 if ((close_delay != acm->port.close_delay) ||
923 (closing_wait != acm->port.closing_wait))
924 retval = -EPERM;
925 else
926 retval = -EOPNOTSUPP;
927 } else {
928 acm->port.close_delay = close_delay;
929 acm->port.closing_wait = closing_wait;
930 }
931
932 mutex_unlock(&acm->port.mutex);
933 return retval;
934 }
935
wait_serial_change(struct acm * acm,unsigned long arg)936 static int wait_serial_change(struct acm *acm, unsigned long arg)
937 {
938 int rv = 0;
939 DECLARE_WAITQUEUE(wait, current);
940 struct async_icount old, new;
941
942 do {
943 spin_lock_irq(&acm->read_lock);
944 old = acm->oldcount;
945 new = acm->iocount;
946 acm->oldcount = new;
947 spin_unlock_irq(&acm->read_lock);
948
949 if ((arg & TIOCM_DSR) &&
950 old.dsr != new.dsr)
951 break;
952 if ((arg & TIOCM_CD) &&
953 old.dcd != new.dcd)
954 break;
955 if ((arg & TIOCM_RI) &&
956 old.rng != new.rng)
957 break;
958
959 add_wait_queue(&acm->wioctl, &wait);
960 set_current_state(TASK_INTERRUPTIBLE);
961 schedule();
962 remove_wait_queue(&acm->wioctl, &wait);
963 if (acm->disconnected) {
964 if (arg & TIOCM_CD)
965 break;
966 else
967 rv = -ENODEV;
968 } else {
969 if (signal_pending(current))
970 rv = -ERESTARTSYS;
971 }
972 } while (!rv);
973
974
975
976 return rv;
977 }
978
acm_tty_get_icount(struct tty_struct * tty,struct serial_icounter_struct * icount)979 static int acm_tty_get_icount(struct tty_struct *tty,
980 struct serial_icounter_struct *icount)
981 {
982 struct acm *acm = tty->driver_data;
983
984 icount->dsr = acm->iocount.dsr;
985 icount->rng = acm->iocount.rng;
986 icount->dcd = acm->iocount.dcd;
987 icount->frame = acm->iocount.frame;
988 icount->overrun = acm->iocount.overrun;
989 icount->parity = acm->iocount.parity;
990 icount->brk = acm->iocount.brk;
991
992 return 0;
993 }
994
acm_tty_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)995 static int acm_tty_ioctl(struct tty_struct *tty,
996 unsigned int cmd, unsigned long arg)
997 {
998 struct acm *acm = tty->driver_data;
999 int rv = -ENOIOCTLCMD;
1000
1001 switch (cmd) {
1002 case TIOCGSERIAL: /* gets serial port data */
1003 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
1004 break;
1005 case TIOCSSERIAL:
1006 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
1007 break;
1008 case TIOCMIWAIT:
1009 rv = usb_autopm_get_interface(acm->control);
1010 if (rv < 0) {
1011 rv = -EIO;
1012 break;
1013 }
1014 rv = wait_serial_change(acm, arg);
1015 usb_autopm_put_interface(acm->control);
1016 break;
1017 }
1018
1019 return rv;
1020 }
1021
acm_tty_set_termios(struct tty_struct * tty,struct ktermios * termios_old)1022 static void acm_tty_set_termios(struct tty_struct *tty,
1023 struct ktermios *termios_old)
1024 {
1025 struct acm *acm = tty->driver_data;
1026 struct ktermios *termios = &tty->termios;
1027 struct usb_cdc_line_coding newline;
1028 int newctrl = acm->ctrlout;
1029
1030 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1031 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1032 newline.bParityType = termios->c_cflag & PARENB ?
1033 (termios->c_cflag & PARODD ? 1 : 2) +
1034 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1035 switch (termios->c_cflag & CSIZE) {
1036 case CS5:
1037 newline.bDataBits = 5;
1038 break;
1039 case CS6:
1040 newline.bDataBits = 6;
1041 break;
1042 case CS7:
1043 newline.bDataBits = 7;
1044 break;
1045 case CS8:
1046 default:
1047 newline.bDataBits = 8;
1048 break;
1049 }
1050 /* FIXME: Needs to clear unsupported bits in the termios */
1051 acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1052
1053 if (C_BAUD(tty) == B0) {
1054 newline.dwDTERate = acm->line.dwDTERate;
1055 newctrl &= ~ACM_CTRL_DTR;
1056 } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1057 newctrl |= ACM_CTRL_DTR;
1058 }
1059
1060 if (newctrl != acm->ctrlout)
1061 acm_set_control(acm, acm->ctrlout = newctrl);
1062
1063 if (memcmp(&acm->line, &newline, sizeof newline)) {
1064 memcpy(&acm->line, &newline, sizeof newline);
1065 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1066 __func__,
1067 le32_to_cpu(newline.dwDTERate),
1068 newline.bCharFormat, newline.bParityType,
1069 newline.bDataBits);
1070 acm_set_line(acm, &acm->line);
1071 }
1072 }
1073
1074 static const struct tty_port_operations acm_port_ops = {
1075 .dtr_rts = acm_port_dtr_rts,
1076 .shutdown = acm_port_shutdown,
1077 .activate = acm_port_activate,
1078 .destruct = acm_port_destruct,
1079 };
1080
1081 /*
1082 * USB probe and disconnect routines.
1083 */
1084
1085 /* Little helpers: write/read buffers free */
acm_write_buffers_free(struct acm * acm)1086 static void acm_write_buffers_free(struct acm *acm)
1087 {
1088 int i;
1089 struct acm_wb *wb;
1090
1091 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1092 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1093 }
1094
acm_read_buffers_free(struct acm * acm)1095 static void acm_read_buffers_free(struct acm *acm)
1096 {
1097 int i;
1098
1099 for (i = 0; i < acm->rx_buflimit; i++)
1100 usb_free_coherent(acm->dev, acm->readsize,
1101 acm->read_buffers[i].base, acm->read_buffers[i].dma);
1102 }
1103
1104 /* Little helper: write buffers allocate */
acm_write_buffers_alloc(struct acm * acm)1105 static int acm_write_buffers_alloc(struct acm *acm)
1106 {
1107 int i;
1108 struct acm_wb *wb;
1109
1110 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1111 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1112 &wb->dmah);
1113 if (!wb->buf) {
1114 while (i != 0) {
1115 --i;
1116 --wb;
1117 usb_free_coherent(acm->dev, acm->writesize,
1118 wb->buf, wb->dmah);
1119 }
1120 return -ENOMEM;
1121 }
1122 }
1123 return 0;
1124 }
1125
acm_probe(struct usb_interface * intf,const struct usb_device_id * id)1126 static int acm_probe(struct usb_interface *intf,
1127 const struct usb_device_id *id)
1128 {
1129 struct usb_cdc_union_desc *union_header = NULL;
1130 struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1131 unsigned char *buffer = intf->altsetting->extra;
1132 int buflen = intf->altsetting->extralen;
1133 struct usb_interface *control_interface;
1134 struct usb_interface *data_interface;
1135 struct usb_endpoint_descriptor *epctrl = NULL;
1136 struct usb_endpoint_descriptor *epread = NULL;
1137 struct usb_endpoint_descriptor *epwrite = NULL;
1138 struct usb_device *usb_dev = interface_to_usbdev(intf);
1139 struct usb_cdc_parsed_header h;
1140 struct acm *acm;
1141 int minor;
1142 int ctrlsize, readsize;
1143 u8 *buf;
1144 int call_intf_num = -1;
1145 int data_intf_num = -1;
1146 unsigned long quirks;
1147 int num_rx_buf;
1148 int i;
1149 int combined_interfaces = 0;
1150 struct device *tty_dev;
1151 int rv = -ENOMEM;
1152 int res;
1153
1154 /* normal quirks */
1155 quirks = (unsigned long)id->driver_info;
1156
1157 if (quirks == IGNORE_DEVICE)
1158 return -ENODEV;
1159
1160 memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1161
1162 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1163
1164 /* handle quirks deadly to normal probing*/
1165 if (quirks == NO_UNION_NORMAL) {
1166 data_interface = usb_ifnum_to_if(usb_dev, 1);
1167 control_interface = usb_ifnum_to_if(usb_dev, 0);
1168 /* we would crash */
1169 if (!data_interface || !control_interface)
1170 return -ENODEV;
1171 goto skip_normal_probe;
1172 }
1173
1174 /* normal probing*/
1175 if (!buffer) {
1176 dev_err(&intf->dev, "Weird descriptor references\n");
1177 return -EINVAL;
1178 }
1179
1180 if (!intf->cur_altsetting)
1181 return -EINVAL;
1182
1183 if (!buflen) {
1184 if (intf->cur_altsetting->endpoint &&
1185 intf->cur_altsetting->endpoint->extralen &&
1186 intf->cur_altsetting->endpoint->extra) {
1187 dev_dbg(&intf->dev,
1188 "Seeking extra descriptors on endpoint\n");
1189 buflen = intf->cur_altsetting->endpoint->extralen;
1190 buffer = intf->cur_altsetting->endpoint->extra;
1191 } else {
1192 dev_err(&intf->dev,
1193 "Zero length descriptor references\n");
1194 return -EINVAL;
1195 }
1196 }
1197
1198 cdc_parse_cdc_header(&h, intf, buffer, buflen);
1199 union_header = h.usb_cdc_union_desc;
1200 cmgmd = h.usb_cdc_call_mgmt_descriptor;
1201 if (cmgmd)
1202 call_intf_num = cmgmd->bDataInterface;
1203
1204 if (!union_header) {
1205 if (call_intf_num > 0) {
1206 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1207 /* quirks for Droids MuIn LCD */
1208 if (quirks & NO_DATA_INTERFACE) {
1209 data_interface = usb_ifnum_to_if(usb_dev, 0);
1210 } else {
1211 data_intf_num = call_intf_num;
1212 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1213 }
1214 control_interface = intf;
1215 } else {
1216 if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1217 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1218 return -ENODEV;
1219 } else {
1220 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1221 combined_interfaces = 1;
1222 control_interface = data_interface = intf;
1223 goto look_for_collapsed_interface;
1224 }
1225 }
1226 } else {
1227 data_intf_num = union_header->bSlaveInterface0;
1228 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1229 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1230 }
1231
1232 if (!control_interface || !data_interface) {
1233 dev_dbg(&intf->dev, "no interfaces\n");
1234 return -ENODEV;
1235 }
1236 if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1237 return -ENODEV;
1238
1239 if (data_intf_num != call_intf_num)
1240 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1241
1242 if (control_interface == data_interface) {
1243 /* some broken devices designed for windows work this way */
1244 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1245 combined_interfaces = 1;
1246 /* a popular other OS doesn't use it */
1247 quirks |= NO_CAP_LINE;
1248 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1249 dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1250 return -EINVAL;
1251 }
1252 look_for_collapsed_interface:
1253 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1254 &epread, &epwrite, &epctrl, NULL);
1255 if (res)
1256 return res;
1257
1258 goto made_compressed_probe;
1259 }
1260
1261 skip_normal_probe:
1262
1263 /*workaround for switched interfaces */
1264 if (data_interface->cur_altsetting->desc.bInterfaceClass
1265 != CDC_DATA_INTERFACE_TYPE) {
1266 if (control_interface->cur_altsetting->desc.bInterfaceClass
1267 == CDC_DATA_INTERFACE_TYPE) {
1268 dev_dbg(&intf->dev,
1269 "Your device has switched interfaces.\n");
1270 swap(control_interface, data_interface);
1271 } else {
1272 return -EINVAL;
1273 }
1274 }
1275
1276 /* Accept probe requests only for the control interface */
1277 if (!combined_interfaces && intf != control_interface)
1278 return -ENODEV;
1279
1280 if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1281 /* valid in this context */
1282 dev_dbg(&intf->dev, "The data interface isn't available\n");
1283 return -EBUSY;
1284 }
1285
1286
1287 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1288 control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1289 return -EINVAL;
1290
1291 epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1292 epread = &data_interface->cur_altsetting->endpoint[0].desc;
1293 epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1294
1295
1296 /* workaround for switched endpoints */
1297 if (!usb_endpoint_dir_in(epread)) {
1298 /* descriptors are swapped */
1299 dev_dbg(&intf->dev,
1300 "The data interface has switched endpoints\n");
1301 swap(epread, epwrite);
1302 }
1303 made_compressed_probe:
1304 dev_dbg(&intf->dev, "interfaces are valid\n");
1305
1306 acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1307 if (acm == NULL)
1308 goto alloc_fail;
1309
1310 tty_port_init(&acm->port);
1311 acm->port.ops = &acm_port_ops;
1312
1313 minor = acm_alloc_minor(acm);
1314 if (minor < 0)
1315 goto alloc_fail1;
1316
1317 ctrlsize = usb_endpoint_maxp(epctrl);
1318 readsize = usb_endpoint_maxp(epread) *
1319 (quirks == SINGLE_RX_URB ? 1 : 2);
1320 acm->combined_interfaces = combined_interfaces;
1321 acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1322 acm->control = control_interface;
1323 acm->data = data_interface;
1324 acm->minor = minor;
1325 acm->dev = usb_dev;
1326 if (h.usb_cdc_acm_descriptor)
1327 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1328 if (quirks & NO_CAP_LINE)
1329 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1330 acm->ctrlsize = ctrlsize;
1331 acm->readsize = readsize;
1332 acm->rx_buflimit = num_rx_buf;
1333 INIT_WORK(&acm->work, acm_softint);
1334 init_waitqueue_head(&acm->wioctl);
1335 spin_lock_init(&acm->write_lock);
1336 spin_lock_init(&acm->read_lock);
1337 mutex_init(&acm->mutex);
1338 if (usb_endpoint_xfer_int(epread)) {
1339 acm->bInterval = epread->bInterval;
1340 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1341 } else {
1342 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1343 }
1344 if (usb_endpoint_xfer_int(epwrite))
1345 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1346 else
1347 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1348 init_usb_anchor(&acm->delayed);
1349 acm->quirks = quirks;
1350
1351 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1352 if (!buf)
1353 goto alloc_fail1;
1354 acm->ctrl_buffer = buf;
1355
1356 if (acm_write_buffers_alloc(acm) < 0)
1357 goto alloc_fail2;
1358
1359 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1360 if (!acm->ctrlurb)
1361 goto alloc_fail3;
1362
1363 for (i = 0; i < num_rx_buf; i++) {
1364 struct acm_rb *rb = &(acm->read_buffers[i]);
1365 struct urb *urb;
1366
1367 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1368 &rb->dma);
1369 if (!rb->base)
1370 goto alloc_fail4;
1371 rb->index = i;
1372 rb->instance = acm;
1373
1374 urb = usb_alloc_urb(0, GFP_KERNEL);
1375 if (!urb)
1376 goto alloc_fail4;
1377
1378 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1379 urb->transfer_dma = rb->dma;
1380 if (usb_endpoint_xfer_int(epread))
1381 usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1382 acm->readsize,
1383 acm_read_bulk_callback, rb,
1384 acm->bInterval);
1385 else
1386 usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1387 acm->readsize,
1388 acm_read_bulk_callback, rb);
1389
1390 acm->read_urbs[i] = urb;
1391 __set_bit(i, &acm->read_urbs_free);
1392 }
1393 for (i = 0; i < ACM_NW; i++) {
1394 struct acm_wb *snd = &(acm->wb[i]);
1395
1396 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1397 if (snd->urb == NULL)
1398 goto alloc_fail5;
1399
1400 if (usb_endpoint_xfer_int(epwrite))
1401 usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1402 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1403 else
1404 usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1405 NULL, acm->writesize, acm_write_bulk, snd);
1406 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1407 if (quirks & SEND_ZERO_PACKET)
1408 snd->urb->transfer_flags |= URB_ZERO_PACKET;
1409 snd->instance = acm;
1410 }
1411
1412 usb_set_intfdata(intf, acm);
1413
1414 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1415 if (i < 0)
1416 goto alloc_fail5;
1417
1418 if (h.usb_cdc_country_functional_desc) { /* export the country data */
1419 struct usb_cdc_country_functional_desc * cfd =
1420 h.usb_cdc_country_functional_desc;
1421
1422 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1423 if (!acm->country_codes)
1424 goto skip_countries;
1425 acm->country_code_size = cfd->bLength - 4;
1426 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1427 cfd->bLength - 4);
1428 acm->country_rel_date = cfd->iCountryCodeRelDate;
1429
1430 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1431 if (i < 0) {
1432 kfree(acm->country_codes);
1433 acm->country_codes = NULL;
1434 acm->country_code_size = 0;
1435 goto skip_countries;
1436 }
1437
1438 i = device_create_file(&intf->dev,
1439 &dev_attr_iCountryCodeRelDate);
1440 if (i < 0) {
1441 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1442 kfree(acm->country_codes);
1443 acm->country_codes = NULL;
1444 acm->country_code_size = 0;
1445 goto skip_countries;
1446 }
1447 }
1448
1449 skip_countries:
1450 usb_fill_int_urb(acm->ctrlurb, usb_dev,
1451 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1452 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1453 /* works around buggy devices */
1454 epctrl->bInterval ? epctrl->bInterval : 16);
1455 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1456 acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1457 acm->notification_buffer = NULL;
1458 acm->nb_index = 0;
1459 acm->nb_size = 0;
1460
1461 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1462
1463 acm->line.dwDTERate = cpu_to_le32(9600);
1464 acm->line.bDataBits = 8;
1465 acm_set_line(acm, &acm->line);
1466
1467 usb_driver_claim_interface(&acm_driver, data_interface, acm);
1468 usb_set_intfdata(data_interface, acm);
1469
1470 usb_get_intf(control_interface);
1471 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1472 &control_interface->dev);
1473 if (IS_ERR(tty_dev)) {
1474 rv = PTR_ERR(tty_dev);
1475 goto alloc_fail6;
1476 }
1477
1478 if (quirks & CLEAR_HALT_CONDITIONS) {
1479 usb_clear_halt(usb_dev, acm->in);
1480 usb_clear_halt(usb_dev, acm->out);
1481 }
1482
1483 return 0;
1484 alloc_fail6:
1485 if (acm->country_codes) {
1486 device_remove_file(&acm->control->dev,
1487 &dev_attr_wCountryCodes);
1488 device_remove_file(&acm->control->dev,
1489 &dev_attr_iCountryCodeRelDate);
1490 kfree(acm->country_codes);
1491 }
1492 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1493 alloc_fail5:
1494 usb_set_intfdata(intf, NULL);
1495 for (i = 0; i < ACM_NW; i++)
1496 usb_free_urb(acm->wb[i].urb);
1497 alloc_fail4:
1498 for (i = 0; i < num_rx_buf; i++)
1499 usb_free_urb(acm->read_urbs[i]);
1500 acm_read_buffers_free(acm);
1501 usb_free_urb(acm->ctrlurb);
1502 alloc_fail3:
1503 acm_write_buffers_free(acm);
1504 alloc_fail2:
1505 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1506 alloc_fail1:
1507 tty_port_put(&acm->port);
1508 alloc_fail:
1509 return rv;
1510 }
1511
acm_disconnect(struct usb_interface * intf)1512 static void acm_disconnect(struct usb_interface *intf)
1513 {
1514 struct acm *acm = usb_get_intfdata(intf);
1515 struct tty_struct *tty;
1516 int i;
1517
1518 /* sibling interface is already cleaning up */
1519 if (!acm)
1520 return;
1521
1522 mutex_lock(&acm->mutex);
1523 acm->disconnected = true;
1524 if (acm->country_codes) {
1525 device_remove_file(&acm->control->dev,
1526 &dev_attr_wCountryCodes);
1527 device_remove_file(&acm->control->dev,
1528 &dev_attr_iCountryCodeRelDate);
1529 }
1530 wake_up_all(&acm->wioctl);
1531 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1532 usb_set_intfdata(acm->control, NULL);
1533 usb_set_intfdata(acm->data, NULL);
1534 mutex_unlock(&acm->mutex);
1535
1536 tty = tty_port_tty_get(&acm->port);
1537 if (tty) {
1538 tty_vhangup(tty);
1539 tty_kref_put(tty);
1540 }
1541
1542 acm_kill_urbs(acm);
1543 cancel_work_sync(&acm->work);
1544
1545 tty_unregister_device(acm_tty_driver, acm->minor);
1546
1547 usb_free_urb(acm->ctrlurb);
1548 for (i = 0; i < ACM_NW; i++)
1549 usb_free_urb(acm->wb[i].urb);
1550 for (i = 0; i < acm->rx_buflimit; i++)
1551 usb_free_urb(acm->read_urbs[i]);
1552 acm_write_buffers_free(acm);
1553 usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1554 acm_read_buffers_free(acm);
1555
1556 kfree(acm->notification_buffer);
1557
1558 if (!acm->combined_interfaces)
1559 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1560 acm->data : acm->control);
1561
1562 tty_port_put(&acm->port);
1563 }
1564
1565 #ifdef CONFIG_PM
acm_suspend(struct usb_interface * intf,pm_message_t message)1566 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1567 {
1568 struct acm *acm = usb_get_intfdata(intf);
1569 int cnt;
1570
1571 spin_lock_irq(&acm->write_lock);
1572 if (PMSG_IS_AUTO(message)) {
1573 if (acm->transmitting) {
1574 spin_unlock_irq(&acm->write_lock);
1575 return -EBUSY;
1576 }
1577 }
1578 cnt = acm->susp_count++;
1579 spin_unlock_irq(&acm->write_lock);
1580
1581 if (cnt)
1582 return 0;
1583
1584 acm_kill_urbs(acm);
1585 cancel_work_sync(&acm->work);
1586
1587 return 0;
1588 }
1589
acm_resume(struct usb_interface * intf)1590 static int acm_resume(struct usb_interface *intf)
1591 {
1592 struct acm *acm = usb_get_intfdata(intf);
1593 struct urb *urb;
1594 int rv = 0;
1595
1596 spin_lock_irq(&acm->write_lock);
1597
1598 if (--acm->susp_count)
1599 goto out;
1600
1601 if (tty_port_initialized(&acm->port)) {
1602 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1603
1604 for (;;) {
1605 urb = usb_get_from_anchor(&acm->delayed);
1606 if (!urb)
1607 break;
1608
1609 acm_start_wb(acm, urb->context);
1610 }
1611
1612 /*
1613 * delayed error checking because we must
1614 * do the write path at all cost
1615 */
1616 if (rv < 0)
1617 goto out;
1618
1619 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1620 }
1621 out:
1622 spin_unlock_irq(&acm->write_lock);
1623
1624 return rv;
1625 }
1626
acm_reset_resume(struct usb_interface * intf)1627 static int acm_reset_resume(struct usb_interface *intf)
1628 {
1629 struct acm *acm = usb_get_intfdata(intf);
1630
1631 if (tty_port_initialized(&acm->port))
1632 tty_port_tty_hangup(&acm->port, false);
1633
1634 return acm_resume(intf);
1635 }
1636
1637 #endif /* CONFIG_PM */
1638
acm_pre_reset(struct usb_interface * intf)1639 static int acm_pre_reset(struct usb_interface *intf)
1640 {
1641 struct acm *acm = usb_get_intfdata(intf);
1642
1643 clear_bit(EVENT_RX_STALL, &acm->flags);
1644 acm->nb_index = 0; /* pending control transfers are lost */
1645
1646 return 0;
1647 }
1648
1649 #define NOKIA_PCSUITE_ACM_INFO(x) \
1650 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1651 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1652 USB_CDC_ACM_PROTO_VENDOR)
1653
1654 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1655 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1656 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1657 USB_CDC_ACM_PROTO_VENDOR)
1658
1659 /*
1660 * USB driver structure.
1661 */
1662
1663 static const struct usb_device_id acm_ids[] = {
1664 /* quirky and broken devices */
1665 { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1666 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1667 { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1668 .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1669 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1670 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1671 },
1672 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1673 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1674 },
1675 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1676 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1677 },
1678 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1679 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1680 },
1681 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1682 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1683 },
1684 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1685 .driver_info = SINGLE_RX_URB,
1686 },
1687 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1688 .driver_info = SINGLE_RX_URB, /* firmware bug */
1689 },
1690 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1691 .driver_info = SINGLE_RX_URB, /* firmware bug */
1692 },
1693 { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1694 .driver_info = SINGLE_RX_URB,
1695 },
1696 { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1697 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1698 },
1699 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1700 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1701 },
1702 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1703 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1704 },
1705 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1706 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1707 },
1708 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1709 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1710 },
1711 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1712 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1713 },
1714 { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1715 .driver_info = QUIRK_CONTROL_LINE_STATE, },
1716 { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1717 { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1718 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1719 },
1720 /* Motorola H24 HSPA module: */
1721 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
1722 { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
1723 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1724 },
1725 { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
1726 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1727 },
1728 { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
1729 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1730 },
1731 { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
1732 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1733 },
1734 { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
1735 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1736 },
1737 { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
1738 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1739 },
1740 { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
1741 .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
1742 },
1743
1744 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1745 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1746 data interface instead of
1747 communications interface.
1748 Maybe we should define a new
1749 quirk for this. */
1750 },
1751 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1752 .driver_info = NO_UNION_NORMAL,
1753 },
1754 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1755 .driver_info = NO_UNION_NORMAL,
1756 },
1757 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1758 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1759 },
1760 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1761 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1762 },
1763 { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1764 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1765 },
1766 { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1767 .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1768 },
1769 { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1770 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1771 },
1772
1773 { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1774 .driver_info = CLEAR_HALT_CONDITIONS,
1775 },
1776
1777 /* Nokia S60 phones expose two ACM channels. The first is
1778 * a modem and is picked up by the standard AT-command
1779 * information below. The second is 'vendor-specific' but
1780 * is treated as a serial device at the S60 end, so we want
1781 * to expose it on Linux too. */
1782 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1783 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1784 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1785 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1786 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1787 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1788 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1789 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1790 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1791 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1792 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1793 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1794 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1795 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1796 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1797 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1798 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1799 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */
1800 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1801 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1802 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1803 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */
1804 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1805 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1806 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1807 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1808 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1809 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1810 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1811 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1812 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1813 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */
1814 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1815 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1816 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1817 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1818 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1819 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1820 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1821 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */
1822 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1823 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1824 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1825 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1826 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1827 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1828 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1829 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1830 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1831 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1832 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1833 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1834 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1835 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1836 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1837 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1838 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1839 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1840
1841 /* Support for Owen devices */
1842 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1843
1844 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1845
1846 /* Support for Droids MuIn LCD */
1847 { USB_DEVICE(0x04d8, 0x000b),
1848 .driver_info = NO_DATA_INTERFACE,
1849 },
1850
1851 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1852 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */
1853 .driver_info = IGNORE_DEVICE,
1854 },
1855 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */
1856 .driver_info = IGNORE_DEVICE,
1857 },
1858 #endif
1859
1860 /*Samsung phone in firmware update mode */
1861 { USB_DEVICE(0x04e8, 0x685d),
1862 .driver_info = IGNORE_DEVICE,
1863 },
1864
1865 /* Exclude Infineon Flash Loader utility */
1866 { USB_DEVICE(0x058b, 0x0041),
1867 .driver_info = IGNORE_DEVICE,
1868 },
1869
1870 /* control interfaces without any protocol set */
1871 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1872 USB_CDC_PROTO_NONE) },
1873
1874 /* control interfaces with various AT-command sets */
1875 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1876 USB_CDC_ACM_PROTO_AT_V25TER) },
1877 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1878 USB_CDC_ACM_PROTO_AT_PCCA101) },
1879 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1880 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1881 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1882 USB_CDC_ACM_PROTO_AT_GSM) },
1883 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1884 USB_CDC_ACM_PROTO_AT_3G) },
1885 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1886 USB_CDC_ACM_PROTO_AT_CDMA) },
1887
1888 { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1889 .driver_info = SEND_ZERO_PACKET,
1890 },
1891
1892 { }
1893 };
1894
1895 MODULE_DEVICE_TABLE(usb, acm_ids);
1896
1897 static struct usb_driver acm_driver = {
1898 .name = "cdc_acm",
1899 .probe = acm_probe,
1900 .disconnect = acm_disconnect,
1901 #ifdef CONFIG_PM
1902 .suspend = acm_suspend,
1903 .resume = acm_resume,
1904 .reset_resume = acm_reset_resume,
1905 #endif
1906 .pre_reset = acm_pre_reset,
1907 .id_table = acm_ids,
1908 #ifdef CONFIG_PM
1909 .supports_autosuspend = 1,
1910 #endif
1911 .disable_hub_initiated_lpm = 1,
1912 };
1913
1914 /*
1915 * TTY driver structures.
1916 */
1917
1918 static const struct tty_operations acm_ops = {
1919 .install = acm_tty_install,
1920 .open = acm_tty_open,
1921 .close = acm_tty_close,
1922 .cleanup = acm_tty_cleanup,
1923 .hangup = acm_tty_hangup,
1924 .write = acm_tty_write,
1925 .write_room = acm_tty_write_room,
1926 .ioctl = acm_tty_ioctl,
1927 .throttle = acm_tty_throttle,
1928 .unthrottle = acm_tty_unthrottle,
1929 .chars_in_buffer = acm_tty_chars_in_buffer,
1930 .break_ctl = acm_tty_break_ctl,
1931 .set_termios = acm_tty_set_termios,
1932 .tiocmget = acm_tty_tiocmget,
1933 .tiocmset = acm_tty_tiocmset,
1934 .get_icount = acm_tty_get_icount,
1935 };
1936
1937 /*
1938 * Init / exit.
1939 */
1940
acm_init(void)1941 static int __init acm_init(void)
1942 {
1943 int retval;
1944 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1945 if (!acm_tty_driver)
1946 return -ENOMEM;
1947 acm_tty_driver->driver_name = "acm",
1948 acm_tty_driver->name = "ttyACM",
1949 acm_tty_driver->major = ACM_TTY_MAJOR,
1950 acm_tty_driver->minor_start = 0,
1951 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1952 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1953 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1954 acm_tty_driver->init_termios = tty_std_termios;
1955 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1956 HUPCL | CLOCAL;
1957 tty_set_operations(acm_tty_driver, &acm_ops);
1958
1959 retval = tty_register_driver(acm_tty_driver);
1960 if (retval) {
1961 put_tty_driver(acm_tty_driver);
1962 return retval;
1963 }
1964
1965 retval = usb_register(&acm_driver);
1966 if (retval) {
1967 tty_unregister_driver(acm_tty_driver);
1968 put_tty_driver(acm_tty_driver);
1969 return retval;
1970 }
1971
1972 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1973
1974 return 0;
1975 }
1976
acm_exit(void)1977 static void __exit acm_exit(void)
1978 {
1979 usb_deregister(&acm_driver);
1980 tty_unregister_driver(acm_tty_driver);
1981 put_tty_driver(acm_tty_driver);
1982 idr_destroy(&acm_minors);
1983 }
1984
1985 module_init(acm_init);
1986 module_exit(acm_exit);
1987
1988 MODULE_AUTHOR(DRIVER_AUTHOR);
1989 MODULE_DESCRIPTION(DRIVER_DESC);
1990 MODULE_LICENSE("GPL");
1991 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
1992
