Merge tag 'usb-5.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
[muen/linux.git] / drivers / usb / class / cdc-acm.c
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  */
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  */
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'.  */
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
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  */
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
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
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
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  */
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
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  */
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
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
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
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 */
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
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
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
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
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 */
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
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_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
562                 tty_port_tty_wakeup(&acm->port);
563 }
564
565 /*
566  * TTY handlers
567  */
568
569 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
570 {
571         struct acm *acm;
572         int retval;
573
574         acm = acm_get_by_minor(tty->index);
575         if (!acm)
576                 return -ENODEV;
577
578         retval = tty_standard_install(driver, tty);
579         if (retval)
580                 goto error_init_termios;
581
582         /*
583          * Suppress initial echoing for some devices which might send data
584          * immediately after acm driver has been installed.
585          */
586         if (acm->quirks & DISABLE_ECHO)
587                 tty->termios.c_lflag &= ~ECHO;
588
589         tty->driver_data = acm;
590
591         return 0;
592
593 error_init_termios:
594         tty_port_put(&acm->port);
595         return retval;
596 }
597
598 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
599 {
600         struct acm *acm = tty->driver_data;
601
602         return tty_port_open(&acm->port, tty, filp);
603 }
604
605 static void acm_port_dtr_rts(struct tty_port *port, int raise)
606 {
607         struct acm *acm = container_of(port, struct acm, port);
608         int val;
609         int res;
610
611         if (raise)
612                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
613         else
614                 val = 0;
615
616         /* FIXME: add missing ctrlout locking throughout driver */
617         acm->ctrlout = val;
618
619         res = acm_set_control(acm, val);
620         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
621                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
622 }
623
624 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
625 {
626         struct acm *acm = container_of(port, struct acm, port);
627         int retval = -ENODEV;
628         int i;
629
630         mutex_lock(&acm->mutex);
631         if (acm->disconnected)
632                 goto disconnected;
633
634         retval = usb_autopm_get_interface(acm->control);
635         if (retval)
636                 goto error_get_interface;
637
638         /*
639          * FIXME: Why do we need this? Allocating 64K of physically contiguous
640          * memory is really nasty...
641          */
642         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
643         acm->control->needs_remote_wakeup = 1;
644
645         acm->ctrlurb->dev = acm->dev;
646         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
647         if (retval) {
648                 dev_err(&acm->control->dev,
649                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
650                 goto error_submit_urb;
651         }
652
653         acm_tty_set_termios(tty, NULL);
654
655         /*
656          * Unthrottle device in case the TTY was closed while throttled.
657          */
658         spin_lock_irq(&acm->read_lock);
659         acm->throttled = 0;
660         acm->throttle_req = 0;
661         spin_unlock_irq(&acm->read_lock);
662
663         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
664         if (retval)
665                 goto error_submit_read_urbs;
666
667         usb_autopm_put_interface(acm->control);
668
669         mutex_unlock(&acm->mutex);
670
671         return 0;
672
673 error_submit_read_urbs:
674         for (i = 0; i < acm->rx_buflimit; i++)
675                 usb_kill_urb(acm->read_urbs[i]);
676         usb_kill_urb(acm->ctrlurb);
677 error_submit_urb:
678         usb_autopm_put_interface(acm->control);
679 error_get_interface:
680 disconnected:
681         mutex_unlock(&acm->mutex);
682
683         return usb_translate_errors(retval);
684 }
685
686 static void acm_port_destruct(struct tty_port *port)
687 {
688         struct acm *acm = container_of(port, struct acm, port);
689
690         acm_release_minor(acm);
691         usb_put_intf(acm->control);
692         kfree(acm->country_codes);
693         kfree(acm);
694 }
695
696 static void acm_port_shutdown(struct tty_port *port)
697 {
698         struct acm *acm = container_of(port, struct acm, port);
699         struct urb *urb;
700         struct acm_wb *wb;
701
702         /*
703          * Need to grab write_lock to prevent race with resume, but no need to
704          * hold it due to the tty-port initialised flag.
705          */
706         spin_lock_irq(&acm->write_lock);
707         spin_unlock_irq(&acm->write_lock);
708
709         usb_autopm_get_interface_no_resume(acm->control);
710         acm->control->needs_remote_wakeup = 0;
711         usb_autopm_put_interface(acm->control);
712
713         for (;;) {
714                 urb = usb_get_from_anchor(&acm->delayed);
715                 if (!urb)
716                         break;
717                 wb = urb->context;
718                 wb->use = 0;
719                 usb_autopm_put_interface_async(acm->control);
720         }
721
722         acm_kill_urbs(acm);
723 }
724
725 static void acm_tty_cleanup(struct tty_struct *tty)
726 {
727         struct acm *acm = tty->driver_data;
728
729         tty_port_put(&acm->port);
730 }
731
732 static void acm_tty_hangup(struct tty_struct *tty)
733 {
734         struct acm *acm = tty->driver_data;
735
736         tty_port_hangup(&acm->port);
737 }
738
739 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
740 {
741         struct acm *acm = tty->driver_data;
742
743         tty_port_close(&acm->port, tty, filp);
744 }
745
746 static int acm_tty_write(struct tty_struct *tty,
747                                         const unsigned char *buf, int count)
748 {
749         struct acm *acm = tty->driver_data;
750         int stat;
751         unsigned long flags;
752         int wbn;
753         struct acm_wb *wb;
754
755         if (!count)
756                 return 0;
757
758         dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
759
760         spin_lock_irqsave(&acm->write_lock, flags);
761         wbn = acm_wb_alloc(acm);
762         if (wbn < 0) {
763                 spin_unlock_irqrestore(&acm->write_lock, flags);
764                 return 0;
765         }
766         wb = &acm->wb[wbn];
767
768         if (!acm->dev) {
769                 wb->use = 0;
770                 spin_unlock_irqrestore(&acm->write_lock, flags);
771                 return -ENODEV;
772         }
773
774         count = (count > acm->writesize) ? acm->writesize : count;
775         dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
776         memcpy(wb->buf, buf, count);
777         wb->len = count;
778
779         stat = usb_autopm_get_interface_async(acm->control);
780         if (stat) {
781                 wb->use = 0;
782                 spin_unlock_irqrestore(&acm->write_lock, flags);
783                 return stat;
784         }
785
786         if (acm->susp_count) {
787                 usb_anchor_urb(wb->urb, &acm->delayed);
788                 spin_unlock_irqrestore(&acm->write_lock, flags);
789                 return count;
790         }
791
792         stat = acm_start_wb(acm, wb);
793         spin_unlock_irqrestore(&acm->write_lock, flags);
794
795         if (stat < 0)
796                 return stat;
797         return count;
798 }
799
800 static int acm_tty_write_room(struct tty_struct *tty)
801 {
802         struct acm *acm = tty->driver_data;
803         /*
804          * Do not let the line discipline to know that we have a reserve,
805          * or it might get too enthusiastic.
806          */
807         return acm_wb_is_avail(acm) ? acm->writesize : 0;
808 }
809
810 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
811 {
812         struct acm *acm = tty->driver_data;
813         /*
814          * if the device was unplugged then any remaining characters fell out
815          * of the connector ;)
816          */
817         if (acm->disconnected)
818                 return 0;
819         /*
820          * This is inaccurate (overcounts), but it works.
821          */
822         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
823 }
824
825 static void acm_tty_throttle(struct tty_struct *tty)
826 {
827         struct acm *acm = tty->driver_data;
828
829         spin_lock_irq(&acm->read_lock);
830         acm->throttle_req = 1;
831         spin_unlock_irq(&acm->read_lock);
832 }
833
834 static void acm_tty_unthrottle(struct tty_struct *tty)
835 {
836         struct acm *acm = tty->driver_data;
837         unsigned int was_throttled;
838
839         spin_lock_irq(&acm->read_lock);
840         was_throttled = acm->throttled;
841         acm->throttled = 0;
842         acm->throttle_req = 0;
843         spin_unlock_irq(&acm->read_lock);
844
845         if (was_throttled)
846                 acm_submit_read_urbs(acm, GFP_KERNEL);
847 }
848
849 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
850 {
851         struct acm *acm = tty->driver_data;
852         int retval;
853
854         retval = acm_send_break(acm, state ? 0xffff : 0);
855         if (retval < 0)
856                 dev_dbg(&acm->control->dev,
857                         "%s - send break failed\n", __func__);
858         return retval;
859 }
860
861 static int acm_tty_tiocmget(struct tty_struct *tty)
862 {
863         struct acm *acm = tty->driver_data;
864
865         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
866                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
867                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
868                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
869                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
870                TIOCM_CTS;
871 }
872
873 static int acm_tty_tiocmset(struct tty_struct *tty,
874                             unsigned int set, unsigned int clear)
875 {
876         struct acm *acm = tty->driver_data;
877         unsigned int newctrl;
878
879         newctrl = acm->ctrlout;
880         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
881                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
882         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
883                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
884
885         newctrl = (newctrl & ~clear) | set;
886
887         if (acm->ctrlout == newctrl)
888                 return 0;
889         return acm_set_control(acm, acm->ctrlout = newctrl);
890 }
891
892 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
893 {
894         struct acm *acm = tty->driver_data;
895
896         ss->xmit_fifo_size = acm->writesize;
897         ss->baud_base = le32_to_cpu(acm->line.dwDTERate);
898         ss->close_delay = acm->port.close_delay / 10;
899         ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
900                                 ASYNC_CLOSING_WAIT_NONE :
901                                 acm->port.closing_wait / 10;
902         return 0;
903 }
904
905 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
906 {
907         struct acm *acm = tty->driver_data;
908         unsigned int closing_wait, close_delay;
909         int retval = 0;
910
911         close_delay = ss->close_delay * 10;
912         closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
913                         ASYNC_CLOSING_WAIT_NONE : ss->closing_wait * 10;
914
915         mutex_lock(&acm->port.mutex);
916
917         if (!capable(CAP_SYS_ADMIN)) {
918                 if ((close_delay != acm->port.close_delay) ||
919                     (closing_wait != acm->port.closing_wait))
920                         retval = -EPERM;
921                 else
922                         retval = -EOPNOTSUPP;
923         } else {
924                 acm->port.close_delay  = close_delay;
925                 acm->port.closing_wait = closing_wait;
926         }
927
928         mutex_unlock(&acm->port.mutex);
929         return retval;
930 }
931
932 static int wait_serial_change(struct acm *acm, unsigned long arg)
933 {
934         int rv = 0;
935         DECLARE_WAITQUEUE(wait, current);
936         struct async_icount old, new;
937
938         do {
939                 spin_lock_irq(&acm->read_lock);
940                 old = acm->oldcount;
941                 new = acm->iocount;
942                 acm->oldcount = new;
943                 spin_unlock_irq(&acm->read_lock);
944
945                 if ((arg & TIOCM_DSR) &&
946                         old.dsr != new.dsr)
947                         break;
948                 if ((arg & TIOCM_CD)  &&
949                         old.dcd != new.dcd)
950                         break;
951                 if ((arg & TIOCM_RI) &&
952                         old.rng != new.rng)
953                         break;
954
955                 add_wait_queue(&acm->wioctl, &wait);
956                 set_current_state(TASK_INTERRUPTIBLE);
957                 schedule();
958                 remove_wait_queue(&acm->wioctl, &wait);
959                 if (acm->disconnected) {
960                         if (arg & TIOCM_CD)
961                                 break;
962                         else
963                                 rv = -ENODEV;
964                 } else {
965                         if (signal_pending(current))
966                                 rv = -ERESTARTSYS;
967                 }
968         } while (!rv);
969
970         
971
972         return rv;
973 }
974
975 static int acm_tty_get_icount(struct tty_struct *tty,
976                                         struct serial_icounter_struct *icount)
977 {
978         struct acm *acm = tty->driver_data;
979
980         icount->dsr = acm->iocount.dsr;
981         icount->rng = acm->iocount.rng;
982         icount->dcd = acm->iocount.dcd;
983         icount->frame = acm->iocount.frame;
984         icount->overrun = acm->iocount.overrun;
985         icount->parity = acm->iocount.parity;
986         icount->brk = acm->iocount.brk;
987
988         return 0;
989 }
990
991 static int acm_tty_ioctl(struct tty_struct *tty,
992                                         unsigned int cmd, unsigned long arg)
993 {
994         struct acm *acm = tty->driver_data;
995         int rv = -ENOIOCTLCMD;
996
997         switch (cmd) {
998         case TIOCMIWAIT:
999                 rv = usb_autopm_get_interface(acm->control);
1000                 if (rv < 0) {
1001                         rv = -EIO;
1002                         break;
1003                 }
1004                 rv = wait_serial_change(acm, arg);
1005                 usb_autopm_put_interface(acm->control);
1006                 break;
1007         }
1008
1009         return rv;
1010 }
1011
1012 static void acm_tty_set_termios(struct tty_struct *tty,
1013                                                 struct ktermios *termios_old)
1014 {
1015         struct acm *acm = tty->driver_data;
1016         struct ktermios *termios = &tty->termios;
1017         struct usb_cdc_line_coding newline;
1018         int newctrl = acm->ctrlout;
1019
1020         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1021         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1022         newline.bParityType = termios->c_cflag & PARENB ?
1023                                 (termios->c_cflag & PARODD ? 1 : 2) +
1024                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1025         switch (termios->c_cflag & CSIZE) {
1026         case CS5:
1027                 newline.bDataBits = 5;
1028                 break;
1029         case CS6:
1030                 newline.bDataBits = 6;
1031                 break;
1032         case CS7:
1033                 newline.bDataBits = 7;
1034                 break;
1035         case CS8:
1036         default:
1037                 newline.bDataBits = 8;
1038                 break;
1039         }
1040         /* FIXME: Needs to clear unsupported bits in the termios */
1041         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1042
1043         if (C_BAUD(tty) == B0) {
1044                 newline.dwDTERate = acm->line.dwDTERate;
1045                 newctrl &= ~ACM_CTRL_DTR;
1046         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1047                 newctrl |=  ACM_CTRL_DTR;
1048         }
1049
1050         if (newctrl != acm->ctrlout)
1051                 acm_set_control(acm, acm->ctrlout = newctrl);
1052
1053         if (memcmp(&acm->line, &newline, sizeof newline)) {
1054                 memcpy(&acm->line, &newline, sizeof newline);
1055                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1056                         __func__,
1057                         le32_to_cpu(newline.dwDTERate),
1058                         newline.bCharFormat, newline.bParityType,
1059                         newline.bDataBits);
1060                 acm_set_line(acm, &acm->line);
1061         }
1062 }
1063
1064 static const struct tty_port_operations acm_port_ops = {
1065         .dtr_rts = acm_port_dtr_rts,
1066         .shutdown = acm_port_shutdown,
1067         .activate = acm_port_activate,
1068         .destruct = acm_port_destruct,
1069 };
1070
1071 /*
1072  * USB probe and disconnect routines.
1073  */
1074
1075 /* Little helpers: write/read buffers free */
1076 static void acm_write_buffers_free(struct acm *acm)
1077 {
1078         int i;
1079         struct acm_wb *wb;
1080
1081         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1082                 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1083 }
1084
1085 static void acm_read_buffers_free(struct acm *acm)
1086 {
1087         int i;
1088
1089         for (i = 0; i < acm->rx_buflimit; i++)
1090                 usb_free_coherent(acm->dev, acm->readsize,
1091                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1092 }
1093
1094 /* Little helper: write buffers allocate */
1095 static int acm_write_buffers_alloc(struct acm *acm)
1096 {
1097         int i;
1098         struct acm_wb *wb;
1099
1100         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1101                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1102                     &wb->dmah);
1103                 if (!wb->buf) {
1104                         while (i != 0) {
1105                                 --i;
1106                                 --wb;
1107                                 usb_free_coherent(acm->dev, acm->writesize,
1108                                     wb->buf, wb->dmah);
1109                         }
1110                         return -ENOMEM;
1111                 }
1112         }
1113         return 0;
1114 }
1115
1116 static int acm_probe(struct usb_interface *intf,
1117                      const struct usb_device_id *id)
1118 {
1119         struct usb_cdc_union_desc *union_header = NULL;
1120         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1121         unsigned char *buffer = intf->altsetting->extra;
1122         int buflen = intf->altsetting->extralen;
1123         struct usb_interface *control_interface;
1124         struct usb_interface *data_interface;
1125         struct usb_endpoint_descriptor *epctrl = NULL;
1126         struct usb_endpoint_descriptor *epread = NULL;
1127         struct usb_endpoint_descriptor *epwrite = NULL;
1128         struct usb_device *usb_dev = interface_to_usbdev(intf);
1129         struct usb_cdc_parsed_header h;
1130         struct acm *acm;
1131         int minor;
1132         int ctrlsize, readsize;
1133         u8 *buf;
1134         int call_intf_num = -1;
1135         int data_intf_num = -1;
1136         unsigned long quirks;
1137         int num_rx_buf;
1138         int i;
1139         int combined_interfaces = 0;
1140         struct device *tty_dev;
1141         int rv = -ENOMEM;
1142         int res;
1143
1144         /* normal quirks */
1145         quirks = (unsigned long)id->driver_info;
1146
1147         if (quirks == IGNORE_DEVICE)
1148                 return -ENODEV;
1149
1150         memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1151
1152         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1153
1154         /* handle quirks deadly to normal probing*/
1155         if (quirks == NO_UNION_NORMAL) {
1156                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1157                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1158                 /* we would crash */
1159                 if (!data_interface || !control_interface)
1160                         return -ENODEV;
1161                 goto skip_normal_probe;
1162         }
1163
1164         /* normal probing*/
1165         if (!buffer) {
1166                 dev_err(&intf->dev, "Weird descriptor references\n");
1167                 return -EINVAL;
1168         }
1169
1170         if (!intf->cur_altsetting)
1171                 return -EINVAL;
1172
1173         if (!buflen) {
1174                 if (intf->cur_altsetting->endpoint &&
1175                                 intf->cur_altsetting->endpoint->extralen &&
1176                                 intf->cur_altsetting->endpoint->extra) {
1177                         dev_dbg(&intf->dev,
1178                                 "Seeking extra descriptors on endpoint\n");
1179                         buflen = intf->cur_altsetting->endpoint->extralen;
1180                         buffer = intf->cur_altsetting->endpoint->extra;
1181                 } else {
1182                         dev_err(&intf->dev,
1183                                 "Zero length descriptor references\n");
1184                         return -EINVAL;
1185                 }
1186         }
1187
1188         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1189         union_header = h.usb_cdc_union_desc;
1190         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1191         if (cmgmd)
1192                 call_intf_num = cmgmd->bDataInterface;
1193
1194         if (!union_header) {
1195                 if (call_intf_num > 0) {
1196                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1197                         /* quirks for Droids MuIn LCD */
1198                         if (quirks & NO_DATA_INTERFACE) {
1199                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1200                         } else {
1201                                 data_intf_num = call_intf_num;
1202                                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1203                         }
1204                         control_interface = intf;
1205                 } else {
1206                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1207                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1208                                 return -ENODEV;
1209                         } else {
1210                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1211                                 combined_interfaces = 1;
1212                                 control_interface = data_interface = intf;
1213                                 goto look_for_collapsed_interface;
1214                         }
1215                 }
1216         } else {
1217                 data_intf_num = union_header->bSlaveInterface0;
1218                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1219                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1220         }
1221
1222         if (!control_interface || !data_interface) {
1223                 dev_dbg(&intf->dev, "no interfaces\n");
1224                 return -ENODEV;
1225         }
1226         if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1227                 return -ENODEV;
1228
1229         if (data_intf_num != call_intf_num)
1230                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1231
1232         if (control_interface == data_interface) {
1233                 /* some broken devices designed for windows work this way */
1234                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1235                 combined_interfaces = 1;
1236                 /* a popular other OS doesn't use it */
1237                 quirks |= NO_CAP_LINE;
1238                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1239                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1240                         return -EINVAL;
1241                 }
1242 look_for_collapsed_interface:
1243                 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1244                                 &epread, &epwrite, &epctrl, NULL);
1245                 if (res)
1246                         return res;
1247
1248                 goto made_compressed_probe;
1249         }
1250
1251 skip_normal_probe:
1252
1253         /*workaround for switched interfaces */
1254         if (data_interface->cur_altsetting->desc.bInterfaceClass
1255                                                 != CDC_DATA_INTERFACE_TYPE) {
1256                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1257                                                 == CDC_DATA_INTERFACE_TYPE) {
1258                         dev_dbg(&intf->dev,
1259                                 "Your device has switched interfaces.\n");
1260                         swap(control_interface, data_interface);
1261                 } else {
1262                         return -EINVAL;
1263                 }
1264         }
1265
1266         /* Accept probe requests only for the control interface */
1267         if (!combined_interfaces && intf != control_interface)
1268                 return -ENODEV;
1269
1270         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1271                 /* valid in this context */
1272                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1273                 return -EBUSY;
1274         }
1275
1276
1277         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1278             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1279                 return -EINVAL;
1280
1281         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1282         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1283         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1284
1285
1286         /* workaround for switched endpoints */
1287         if (!usb_endpoint_dir_in(epread)) {
1288                 /* descriptors are swapped */
1289                 dev_dbg(&intf->dev,
1290                         "The data interface has switched endpoints\n");
1291                 swap(epread, epwrite);
1292         }
1293 made_compressed_probe:
1294         dev_dbg(&intf->dev, "interfaces are valid\n");
1295
1296         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1297         if (acm == NULL)
1298                 goto alloc_fail;
1299
1300         tty_port_init(&acm->port);
1301         acm->port.ops = &acm_port_ops;
1302
1303         minor = acm_alloc_minor(acm);
1304         if (minor < 0)
1305                 goto alloc_fail1;
1306
1307         ctrlsize = usb_endpoint_maxp(epctrl);
1308         readsize = usb_endpoint_maxp(epread) *
1309                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1310         acm->combined_interfaces = combined_interfaces;
1311         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1312         acm->control = control_interface;
1313         acm->data = data_interface;
1314         acm->minor = minor;
1315         acm->dev = usb_dev;
1316         if (h.usb_cdc_acm_descriptor)
1317                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1318         if (quirks & NO_CAP_LINE)
1319                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1320         acm->ctrlsize = ctrlsize;
1321         acm->readsize = readsize;
1322         acm->rx_buflimit = num_rx_buf;
1323         INIT_WORK(&acm->work, acm_softint);
1324         init_waitqueue_head(&acm->wioctl);
1325         spin_lock_init(&acm->write_lock);
1326         spin_lock_init(&acm->read_lock);
1327         mutex_init(&acm->mutex);
1328         if (usb_endpoint_xfer_int(epread)) {
1329                 acm->bInterval = epread->bInterval;
1330                 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1331         } else {
1332                 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1333         }
1334         if (usb_endpoint_xfer_int(epwrite))
1335                 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1336         else
1337                 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1338         init_usb_anchor(&acm->delayed);
1339         acm->quirks = quirks;
1340
1341         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1342         if (!buf)
1343                 goto alloc_fail1;
1344         acm->ctrl_buffer = buf;
1345
1346         if (acm_write_buffers_alloc(acm) < 0)
1347                 goto alloc_fail2;
1348
1349         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1350         if (!acm->ctrlurb)
1351                 goto alloc_fail3;
1352
1353         for (i = 0; i < num_rx_buf; i++) {
1354                 struct acm_rb *rb = &(acm->read_buffers[i]);
1355                 struct urb *urb;
1356
1357                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1358                                                                 &rb->dma);
1359                 if (!rb->base)
1360                         goto alloc_fail4;
1361                 rb->index = i;
1362                 rb->instance = acm;
1363
1364                 urb = usb_alloc_urb(0, GFP_KERNEL);
1365                 if (!urb)
1366                         goto alloc_fail4;
1367
1368                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1369                 urb->transfer_dma = rb->dma;
1370                 if (usb_endpoint_xfer_int(epread))
1371                         usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1372                                          acm->readsize,
1373                                          acm_read_bulk_callback, rb,
1374                                          acm->bInterval);
1375                 else
1376                         usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1377                                           acm->readsize,
1378                                           acm_read_bulk_callback, rb);
1379
1380                 acm->read_urbs[i] = urb;
1381                 __set_bit(i, &acm->read_urbs_free);
1382         }
1383         for (i = 0; i < ACM_NW; i++) {
1384                 struct acm_wb *snd = &(acm->wb[i]);
1385
1386                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1387                 if (snd->urb == NULL)
1388                         goto alloc_fail5;
1389
1390                 if (usb_endpoint_xfer_int(epwrite))
1391                         usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1392                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1393                 else
1394                         usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1395                                 NULL, acm->writesize, acm_write_bulk, snd);
1396                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1397                 if (quirks & SEND_ZERO_PACKET)
1398                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1399                 snd->instance = acm;
1400         }
1401
1402         usb_set_intfdata(intf, acm);
1403
1404         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1405         if (i < 0)
1406                 goto alloc_fail5;
1407
1408         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1409                 struct usb_cdc_country_functional_desc * cfd =
1410                                         h.usb_cdc_country_functional_desc;
1411
1412                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1413                 if (!acm->country_codes)
1414                         goto skip_countries;
1415                 acm->country_code_size = cfd->bLength - 4;
1416                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1417                                                         cfd->bLength - 4);
1418                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1419
1420                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1421                 if (i < 0) {
1422                         kfree(acm->country_codes);
1423                         acm->country_codes = NULL;
1424                         acm->country_code_size = 0;
1425                         goto skip_countries;
1426                 }
1427
1428                 i = device_create_file(&intf->dev,
1429                                                 &dev_attr_iCountryCodeRelDate);
1430                 if (i < 0) {
1431                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1432                         kfree(acm->country_codes);
1433                         acm->country_codes = NULL;
1434                         acm->country_code_size = 0;
1435                         goto skip_countries;
1436                 }
1437         }
1438
1439 skip_countries:
1440         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1441                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1442                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1443                          /* works around buggy devices */
1444                          epctrl->bInterval ? epctrl->bInterval : 16);
1445         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1446         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1447         acm->notification_buffer = NULL;
1448         acm->nb_index = 0;
1449         acm->nb_size = 0;
1450
1451         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1452
1453         acm->line.dwDTERate = cpu_to_le32(9600);
1454         acm->line.bDataBits = 8;
1455         acm_set_line(acm, &acm->line);
1456
1457         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1458         usb_set_intfdata(data_interface, acm);
1459
1460         usb_get_intf(control_interface);
1461         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1462                         &control_interface->dev);
1463         if (IS_ERR(tty_dev)) {
1464                 rv = PTR_ERR(tty_dev);
1465                 goto alloc_fail6;
1466         }
1467
1468         if (quirks & CLEAR_HALT_CONDITIONS) {
1469                 usb_clear_halt(usb_dev, acm->in);
1470                 usb_clear_halt(usb_dev, acm->out);
1471         }
1472
1473         return 0;
1474 alloc_fail6:
1475         if (acm->country_codes) {
1476                 device_remove_file(&acm->control->dev,
1477                                 &dev_attr_wCountryCodes);
1478                 device_remove_file(&acm->control->dev,
1479                                 &dev_attr_iCountryCodeRelDate);
1480                 kfree(acm->country_codes);
1481         }
1482         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1483 alloc_fail5:
1484         usb_set_intfdata(intf, NULL);
1485         for (i = 0; i < ACM_NW; i++)
1486                 usb_free_urb(acm->wb[i].urb);
1487 alloc_fail4:
1488         for (i = 0; i < num_rx_buf; i++)
1489                 usb_free_urb(acm->read_urbs[i]);
1490         acm_read_buffers_free(acm);
1491         usb_free_urb(acm->ctrlurb);
1492 alloc_fail3:
1493         acm_write_buffers_free(acm);
1494 alloc_fail2:
1495         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1496 alloc_fail1:
1497         tty_port_put(&acm->port);
1498 alloc_fail:
1499         return rv;
1500 }
1501
1502 static void acm_disconnect(struct usb_interface *intf)
1503 {
1504         struct acm *acm = usb_get_intfdata(intf);
1505         struct tty_struct *tty;
1506         int i;
1507
1508         /* sibling interface is already cleaning up */
1509         if (!acm)
1510                 return;
1511
1512         mutex_lock(&acm->mutex);
1513         acm->disconnected = true;
1514         if (acm->country_codes) {
1515                 device_remove_file(&acm->control->dev,
1516                                 &dev_attr_wCountryCodes);
1517                 device_remove_file(&acm->control->dev,
1518                                 &dev_attr_iCountryCodeRelDate);
1519         }
1520         wake_up_all(&acm->wioctl);
1521         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1522         usb_set_intfdata(acm->control, NULL);
1523         usb_set_intfdata(acm->data, NULL);
1524         mutex_unlock(&acm->mutex);
1525
1526         tty = tty_port_tty_get(&acm->port);
1527         if (tty) {
1528                 tty_vhangup(tty);
1529                 tty_kref_put(tty);
1530         }
1531
1532         acm_kill_urbs(acm);
1533         cancel_work_sync(&acm->work);
1534
1535         tty_unregister_device(acm_tty_driver, acm->minor);
1536
1537         usb_free_urb(acm->ctrlurb);
1538         for (i = 0; i < ACM_NW; i++)
1539                 usb_free_urb(acm->wb[i].urb);
1540         for (i = 0; i < acm->rx_buflimit; i++)
1541                 usb_free_urb(acm->read_urbs[i]);
1542         acm_write_buffers_free(acm);
1543         usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1544         acm_read_buffers_free(acm);
1545
1546         kfree(acm->notification_buffer);
1547
1548         if (!acm->combined_interfaces)
1549                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1550                                         acm->data : acm->control);
1551
1552         tty_port_put(&acm->port);
1553 }
1554
1555 #ifdef CONFIG_PM
1556 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1557 {
1558         struct acm *acm = usb_get_intfdata(intf);
1559         int cnt;
1560
1561         spin_lock_irq(&acm->write_lock);
1562         if (PMSG_IS_AUTO(message)) {
1563                 if (acm->transmitting) {
1564                         spin_unlock_irq(&acm->write_lock);
1565                         return -EBUSY;
1566                 }
1567         }
1568         cnt = acm->susp_count++;
1569         spin_unlock_irq(&acm->write_lock);
1570
1571         if (cnt)
1572                 return 0;
1573
1574         acm_kill_urbs(acm);
1575         cancel_work_sync(&acm->work);
1576
1577         return 0;
1578 }
1579
1580 static int acm_resume(struct usb_interface *intf)
1581 {
1582         struct acm *acm = usb_get_intfdata(intf);
1583         struct urb *urb;
1584         int rv = 0;
1585
1586         spin_lock_irq(&acm->write_lock);
1587
1588         if (--acm->susp_count)
1589                 goto out;
1590
1591         if (tty_port_initialized(&acm->port)) {
1592                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1593
1594                 for (;;) {
1595                         urb = usb_get_from_anchor(&acm->delayed);
1596                         if (!urb)
1597                                 break;
1598
1599                         acm_start_wb(acm, urb->context);
1600                 }
1601
1602                 /*
1603                  * delayed error checking because we must
1604                  * do the write path at all cost
1605                  */
1606                 if (rv < 0)
1607                         goto out;
1608
1609                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1610         }
1611 out:
1612         spin_unlock_irq(&acm->write_lock);
1613
1614         return rv;
1615 }
1616
1617 static int acm_reset_resume(struct usb_interface *intf)
1618 {
1619         struct acm *acm = usb_get_intfdata(intf);
1620
1621         if (tty_port_initialized(&acm->port))
1622                 tty_port_tty_hangup(&acm->port, false);
1623
1624         return acm_resume(intf);
1625 }
1626
1627 #endif /* CONFIG_PM */
1628
1629 static int acm_pre_reset(struct usb_interface *intf)
1630 {
1631         struct acm *acm = usb_get_intfdata(intf);
1632
1633         clear_bit(EVENT_RX_STALL, &acm->flags);
1634         acm->nb_index = 0; /* pending control transfers are lost */
1635
1636         return 0;
1637 }
1638
1639 #define NOKIA_PCSUITE_ACM_INFO(x) \
1640                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1641                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1642                 USB_CDC_ACM_PROTO_VENDOR)
1643
1644 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1645                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1646                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1647                 USB_CDC_ACM_PROTO_VENDOR)
1648
1649 /*
1650  * USB driver structure.
1651  */
1652
1653 static const struct usb_device_id acm_ids[] = {
1654         /* quirky and broken devices */
1655         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1656         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1657         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1658         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1659         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1660         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1661         },
1662         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1663         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1664         },
1665         { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1666         .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1667         },
1668         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1669         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1670         },
1671         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1672         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1673         },
1674         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1675         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1676         },
1677         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1678         .driver_info = SINGLE_RX_URB,
1679         },
1680         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1681         .driver_info = SINGLE_RX_URB, /* firmware bug */
1682         },
1683         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1684         .driver_info = SINGLE_RX_URB, /* firmware bug */
1685         },
1686         { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1687         .driver_info = SINGLE_RX_URB,
1688         },
1689         { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1690         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1691         },
1692         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1693         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1694         },
1695         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1696         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1697         },
1698         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1699         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1700         },
1701         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1702         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1703         },
1704         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1705         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1706         },
1707         { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1708         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1709         },
1710         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1711         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1712         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1713         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1714         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1715         },
1716         /* Motorola H24 HSPA module: */
1717         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1718         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1719         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1720         },
1721         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1722         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1723         },
1724         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1725         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1726         },
1727         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1728         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1729         },
1730         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1731         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1732         },
1733         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1734         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1735         },
1736         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1737         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1738         },
1739
1740         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1741         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1742                                            data interface instead of
1743                                            communications interface.
1744                                            Maybe we should define a new
1745                                            quirk for this. */
1746         },
1747         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1748         .driver_info = NO_UNION_NORMAL,
1749         },
1750         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1751         .driver_info = NO_UNION_NORMAL,
1752         },
1753         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1754         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1755         },
1756         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1757         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1758         },
1759         { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1760         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1761         },
1762         { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1763         .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1764         },
1765         { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1766         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1767         },
1768
1769         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1770         .driver_info = CLEAR_HALT_CONDITIONS,
1771         },
1772
1773         /* Nokia S60 phones expose two ACM channels. The first is
1774          * a modem and is picked up by the standard AT-command
1775          * information below. The second is 'vendor-specific' but
1776          * is treated as a serial device at the S60 end, so we want
1777          * to expose it on Linux too. */
1778         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1779         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1780         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1781         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1782         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1783         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1784         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1785         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1786         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1787         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1788         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1789         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1790         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1791         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1792         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1793         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1794         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1795         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1796         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1797         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1798         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1799         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1800         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1801         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1802         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1803         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1804         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1805         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1806         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1807         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1808         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1809         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1810         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1811         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1812         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1813         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1814         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1815         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1816         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1817         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1818         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1819         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1820         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1821         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1822         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1823         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1824         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1825         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1826         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1827         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1828         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1829         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1830         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1831         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1832         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1833         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1834         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1835         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1836
1837         /* Support for Owen devices */
1838         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1839
1840         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1841
1842         /* Support for Droids MuIn LCD */
1843         { USB_DEVICE(0x04d8, 0x000b),
1844         .driver_info = NO_DATA_INTERFACE,
1845         },
1846
1847 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1848         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1849         .driver_info = IGNORE_DEVICE,
1850         },
1851         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1852         .driver_info = IGNORE_DEVICE,
1853         },
1854 #endif
1855
1856         /*Samsung phone in firmware update mode */
1857         { USB_DEVICE(0x04e8, 0x685d),
1858         .driver_info = IGNORE_DEVICE,
1859         },
1860
1861         /* Exclude Infineon Flash Loader utility */
1862         { USB_DEVICE(0x058b, 0x0041),
1863         .driver_info = IGNORE_DEVICE,
1864         },
1865
1866         { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1867         .driver_info = SEND_ZERO_PACKET,
1868         },
1869         { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1870         .driver_info = SEND_ZERO_PACKET,
1871         },
1872
1873         /* control interfaces without any protocol set */
1874         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1875                 USB_CDC_PROTO_NONE) },
1876
1877         /* control interfaces with various AT-command sets */
1878         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1879                 USB_CDC_ACM_PROTO_AT_V25TER) },
1880         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1881                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1882         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1883                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1884         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1885                 USB_CDC_ACM_PROTO_AT_GSM) },
1886         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1887                 USB_CDC_ACM_PROTO_AT_3G) },
1888         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1889                 USB_CDC_ACM_PROTO_AT_CDMA) },
1890
1891         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1892         .driver_info = SEND_ZERO_PACKET,
1893         },
1894
1895         { }
1896 };
1897
1898 MODULE_DEVICE_TABLE(usb, acm_ids);
1899
1900 static struct usb_driver acm_driver = {
1901         .name =         "cdc_acm",
1902         .probe =        acm_probe,
1903         .disconnect =   acm_disconnect,
1904 #ifdef CONFIG_PM
1905         .suspend =      acm_suspend,
1906         .resume =       acm_resume,
1907         .reset_resume = acm_reset_resume,
1908 #endif
1909         .pre_reset =    acm_pre_reset,
1910         .id_table =     acm_ids,
1911 #ifdef CONFIG_PM
1912         .supports_autosuspend = 1,
1913 #endif
1914         .disable_hub_initiated_lpm = 1,
1915 };
1916
1917 /*
1918  * TTY driver structures.
1919  */
1920
1921 static const struct tty_operations acm_ops = {
1922         .install =              acm_tty_install,
1923         .open =                 acm_tty_open,
1924         .close =                acm_tty_close,
1925         .cleanup =              acm_tty_cleanup,
1926         .hangup =               acm_tty_hangup,
1927         .write =                acm_tty_write,
1928         .write_room =           acm_tty_write_room,
1929         .ioctl =                acm_tty_ioctl,
1930         .throttle =             acm_tty_throttle,
1931         .unthrottle =           acm_tty_unthrottle,
1932         .chars_in_buffer =      acm_tty_chars_in_buffer,
1933         .break_ctl =            acm_tty_break_ctl,
1934         .set_termios =          acm_tty_set_termios,
1935         .tiocmget =             acm_tty_tiocmget,
1936         .tiocmset =             acm_tty_tiocmset,
1937         .get_serial =           get_serial_info,
1938         .set_serial =           set_serial_info,
1939         .get_icount =           acm_tty_get_icount,
1940 };
1941
1942 /*
1943  * Init / exit.
1944  */
1945
1946 static int __init acm_init(void)
1947 {
1948         int retval;
1949         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1950         if (!acm_tty_driver)
1951                 return -ENOMEM;
1952         acm_tty_driver->driver_name = "acm",
1953         acm_tty_driver->name = "ttyACM",
1954         acm_tty_driver->major = ACM_TTY_MAJOR,
1955         acm_tty_driver->minor_start = 0,
1956         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1957         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1958         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1959         acm_tty_driver->init_termios = tty_std_termios;
1960         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1961                                                                 HUPCL | CLOCAL;
1962         tty_set_operations(acm_tty_driver, &acm_ops);
1963
1964         retval = tty_register_driver(acm_tty_driver);
1965         if (retval) {
1966                 put_tty_driver(acm_tty_driver);
1967                 return retval;
1968         }
1969
1970         retval = usb_register(&acm_driver);
1971         if (retval) {
1972                 tty_unregister_driver(acm_tty_driver);
1973                 put_tty_driver(acm_tty_driver);
1974                 return retval;
1975         }
1976
1977         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1978
1979         return 0;
1980 }
1981
1982 static void __exit acm_exit(void)
1983 {
1984         usb_deregister(&acm_driver);
1985         tty_unregister_driver(acm_tty_driver);
1986         put_tty_driver(acm_tty_driver);
1987         idr_destroy(&acm_minors);
1988 }
1989
1990 module_init(acm_init);
1991 module_exit(acm_exit);
1992
1993 MODULE_AUTHOR(DRIVER_AUTHOR);
1994 MODULE_DESCRIPTION(DRIVER_DESC);
1995 MODULE_LICENSE("GPL");
1996 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);