usb: cdc-acm: add entry for Hiro (Conexant) modem
[sfrench/cifs-2.6.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_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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
887 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
888 {
889         struct acm *acm = tty->driver_data;
890
891         ss->xmit_fifo_size = acm->writesize;
892         ss->baud_base = le32_to_cpu(acm->line.dwDTERate);
893         ss->close_delay = acm->port.close_delay / 10;
894         ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
895                                 ASYNC_CLOSING_WAIT_NONE :
896                                 acm->port.closing_wait / 10;
897         return 0;
898 }
899
900 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
901 {
902         struct acm *acm = tty->driver_data;
903         unsigned int closing_wait, close_delay;
904         int retval = 0;
905
906         close_delay = ss->close_delay * 10;
907         closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
908                         ASYNC_CLOSING_WAIT_NONE : ss->closing_wait * 10;
909
910         mutex_lock(&acm->port.mutex);
911
912         if (!capable(CAP_SYS_ADMIN)) {
913                 if ((close_delay != acm->port.close_delay) ||
914                     (closing_wait != acm->port.closing_wait))
915                         retval = -EPERM;
916                 else
917                         retval = -EOPNOTSUPP;
918         } else {
919                 acm->port.close_delay  = close_delay;
920                 acm->port.closing_wait = closing_wait;
921         }
922
923         mutex_unlock(&acm->port.mutex);
924         return retval;
925 }
926
927 static int wait_serial_change(struct acm *acm, unsigned long arg)
928 {
929         int rv = 0;
930         DECLARE_WAITQUEUE(wait, current);
931         struct async_icount old, new;
932
933         do {
934                 spin_lock_irq(&acm->read_lock);
935                 old = acm->oldcount;
936                 new = acm->iocount;
937                 acm->oldcount = new;
938                 spin_unlock_irq(&acm->read_lock);
939
940                 if ((arg & TIOCM_DSR) &&
941                         old.dsr != new.dsr)
942                         break;
943                 if ((arg & TIOCM_CD)  &&
944                         old.dcd != new.dcd)
945                         break;
946                 if ((arg & TIOCM_RI) &&
947                         old.rng != new.rng)
948                         break;
949
950                 add_wait_queue(&acm->wioctl, &wait);
951                 set_current_state(TASK_INTERRUPTIBLE);
952                 schedule();
953                 remove_wait_queue(&acm->wioctl, &wait);
954                 if (acm->disconnected) {
955                         if (arg & TIOCM_CD)
956                                 break;
957                         else
958                                 rv = -ENODEV;
959                 } else {
960                         if (signal_pending(current))
961                                 rv = -ERESTARTSYS;
962                 }
963         } while (!rv);
964
965         
966
967         return rv;
968 }
969
970 static int acm_tty_get_icount(struct tty_struct *tty,
971                                         struct serial_icounter_struct *icount)
972 {
973         struct acm *acm = tty->driver_data;
974
975         icount->dsr = acm->iocount.dsr;
976         icount->rng = acm->iocount.rng;
977         icount->dcd = acm->iocount.dcd;
978         icount->frame = acm->iocount.frame;
979         icount->overrun = acm->iocount.overrun;
980         icount->parity = acm->iocount.parity;
981         icount->brk = acm->iocount.brk;
982
983         return 0;
984 }
985
986 static int acm_tty_ioctl(struct tty_struct *tty,
987                                         unsigned int cmd, unsigned long arg)
988 {
989         struct acm *acm = tty->driver_data;
990         int rv = -ENOIOCTLCMD;
991
992         switch (cmd) {
993         case TIOCMIWAIT:
994                 rv = usb_autopm_get_interface(acm->control);
995                 if (rv < 0) {
996                         rv = -EIO;
997                         break;
998                 }
999                 rv = wait_serial_change(acm, arg);
1000                 usb_autopm_put_interface(acm->control);
1001                 break;
1002         }
1003
1004         return rv;
1005 }
1006
1007 static void acm_tty_set_termios(struct tty_struct *tty,
1008                                                 struct ktermios *termios_old)
1009 {
1010         struct acm *acm = tty->driver_data;
1011         struct ktermios *termios = &tty->termios;
1012         struct usb_cdc_line_coding newline;
1013         int newctrl = acm->ctrlout;
1014
1015         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1016         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1017         newline.bParityType = termios->c_cflag & PARENB ?
1018                                 (termios->c_cflag & PARODD ? 1 : 2) +
1019                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1020         switch (termios->c_cflag & CSIZE) {
1021         case CS5:
1022                 newline.bDataBits = 5;
1023                 break;
1024         case CS6:
1025                 newline.bDataBits = 6;
1026                 break;
1027         case CS7:
1028                 newline.bDataBits = 7;
1029                 break;
1030         case CS8:
1031         default:
1032                 newline.bDataBits = 8;
1033                 break;
1034         }
1035         /* FIXME: Needs to clear unsupported bits in the termios */
1036         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1037
1038         if (C_BAUD(tty) == B0) {
1039                 newline.dwDTERate = acm->line.dwDTERate;
1040                 newctrl &= ~ACM_CTRL_DTR;
1041         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1042                 newctrl |=  ACM_CTRL_DTR;
1043         }
1044
1045         if (newctrl != acm->ctrlout)
1046                 acm_set_control(acm, acm->ctrlout = newctrl);
1047
1048         if (memcmp(&acm->line, &newline, sizeof newline)) {
1049                 memcpy(&acm->line, &newline, sizeof newline);
1050                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1051                         __func__,
1052                         le32_to_cpu(newline.dwDTERate),
1053                         newline.bCharFormat, newline.bParityType,
1054                         newline.bDataBits);
1055                 acm_set_line(acm, &acm->line);
1056         }
1057 }
1058
1059 static const struct tty_port_operations acm_port_ops = {
1060         .dtr_rts = acm_port_dtr_rts,
1061         .shutdown = acm_port_shutdown,
1062         .activate = acm_port_activate,
1063         .destruct = acm_port_destruct,
1064 };
1065
1066 /*
1067  * USB probe and disconnect routines.
1068  */
1069
1070 /* Little helpers: write/read buffers free */
1071 static void acm_write_buffers_free(struct acm *acm)
1072 {
1073         int i;
1074         struct acm_wb *wb;
1075
1076         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1077                 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1078 }
1079
1080 static void acm_read_buffers_free(struct acm *acm)
1081 {
1082         int i;
1083
1084         for (i = 0; i < acm->rx_buflimit; i++)
1085                 usb_free_coherent(acm->dev, acm->readsize,
1086                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1087 }
1088
1089 /* Little helper: write buffers allocate */
1090 static int acm_write_buffers_alloc(struct acm *acm)
1091 {
1092         int i;
1093         struct acm_wb *wb;
1094
1095         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1096                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1097                     &wb->dmah);
1098                 if (!wb->buf) {
1099                         while (i != 0) {
1100                                 --i;
1101                                 --wb;
1102                                 usb_free_coherent(acm->dev, acm->writesize,
1103                                     wb->buf, wb->dmah);
1104                         }
1105                         return -ENOMEM;
1106                 }
1107         }
1108         return 0;
1109 }
1110
1111 static int acm_probe(struct usb_interface *intf,
1112                      const struct usb_device_id *id)
1113 {
1114         struct usb_cdc_union_desc *union_header = NULL;
1115         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1116         unsigned char *buffer = intf->altsetting->extra;
1117         int buflen = intf->altsetting->extralen;
1118         struct usb_interface *control_interface;
1119         struct usb_interface *data_interface;
1120         struct usb_endpoint_descriptor *epctrl = NULL;
1121         struct usb_endpoint_descriptor *epread = NULL;
1122         struct usb_endpoint_descriptor *epwrite = NULL;
1123         struct usb_device *usb_dev = interface_to_usbdev(intf);
1124         struct usb_cdc_parsed_header h;
1125         struct acm *acm;
1126         int minor;
1127         int ctrlsize, readsize;
1128         u8 *buf;
1129         int call_intf_num = -1;
1130         int data_intf_num = -1;
1131         unsigned long quirks;
1132         int num_rx_buf;
1133         int i;
1134         int combined_interfaces = 0;
1135         struct device *tty_dev;
1136         int rv = -ENOMEM;
1137         int res;
1138
1139         /* normal quirks */
1140         quirks = (unsigned long)id->driver_info;
1141
1142         if (quirks == IGNORE_DEVICE)
1143                 return -ENODEV;
1144
1145         memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1146
1147         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1148
1149         /* handle quirks deadly to normal probing*/
1150         if (quirks == NO_UNION_NORMAL) {
1151                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1152                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1153                 /* we would crash */
1154                 if (!data_interface || !control_interface)
1155                         return -ENODEV;
1156                 goto skip_normal_probe;
1157         }
1158
1159         /* normal probing*/
1160         if (!buffer) {
1161                 dev_err(&intf->dev, "Weird descriptor references\n");
1162                 return -EINVAL;
1163         }
1164
1165         if (!intf->cur_altsetting)
1166                 return -EINVAL;
1167
1168         if (!buflen) {
1169                 if (intf->cur_altsetting->endpoint &&
1170                                 intf->cur_altsetting->endpoint->extralen &&
1171                                 intf->cur_altsetting->endpoint->extra) {
1172                         dev_dbg(&intf->dev,
1173                                 "Seeking extra descriptors on endpoint\n");
1174                         buflen = intf->cur_altsetting->endpoint->extralen;
1175                         buffer = intf->cur_altsetting->endpoint->extra;
1176                 } else {
1177                         dev_err(&intf->dev,
1178                                 "Zero length descriptor references\n");
1179                         return -EINVAL;
1180                 }
1181         }
1182
1183         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1184         union_header = h.usb_cdc_union_desc;
1185         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1186         if (cmgmd)
1187                 call_intf_num = cmgmd->bDataInterface;
1188
1189         if (!union_header) {
1190                 if (call_intf_num > 0) {
1191                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1192                         /* quirks for Droids MuIn LCD */
1193                         if (quirks & NO_DATA_INTERFACE) {
1194                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1195                         } else {
1196                                 data_intf_num = call_intf_num;
1197                                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1198                         }
1199                         control_interface = intf;
1200                 } else {
1201                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1202                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1203                                 return -ENODEV;
1204                         } else {
1205                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1206                                 combined_interfaces = 1;
1207                                 control_interface = data_interface = intf;
1208                                 goto look_for_collapsed_interface;
1209                         }
1210                 }
1211         } else {
1212                 data_intf_num = union_header->bSlaveInterface0;
1213                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1214                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1215         }
1216
1217         if (!control_interface || !data_interface) {
1218                 dev_dbg(&intf->dev, "no interfaces\n");
1219                 return -ENODEV;
1220         }
1221         if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1222                 return -ENODEV;
1223
1224         if (data_intf_num != call_intf_num)
1225                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1226
1227         if (control_interface == data_interface) {
1228                 /* some broken devices designed for windows work this way */
1229                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1230                 combined_interfaces = 1;
1231                 /* a popular other OS doesn't use it */
1232                 quirks |= NO_CAP_LINE;
1233                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1234                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1235                         return -EINVAL;
1236                 }
1237 look_for_collapsed_interface:
1238                 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1239                                 &epread, &epwrite, &epctrl, NULL);
1240                 if (res)
1241                         return res;
1242
1243                 goto made_compressed_probe;
1244         }
1245
1246 skip_normal_probe:
1247
1248         /*workaround for switched interfaces */
1249         if (data_interface->cur_altsetting->desc.bInterfaceClass
1250                                                 != CDC_DATA_INTERFACE_TYPE) {
1251                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1252                                                 == CDC_DATA_INTERFACE_TYPE) {
1253                         dev_dbg(&intf->dev,
1254                                 "Your device has switched interfaces.\n");
1255                         swap(control_interface, data_interface);
1256                 } else {
1257                         return -EINVAL;
1258                 }
1259         }
1260
1261         /* Accept probe requests only for the control interface */
1262         if (!combined_interfaces && intf != control_interface)
1263                 return -ENODEV;
1264
1265         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1266                 /* valid in this context */
1267                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1268                 return -EBUSY;
1269         }
1270
1271
1272         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1273             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1274                 return -EINVAL;
1275
1276         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1277         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1278         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1279
1280
1281         /* workaround for switched endpoints */
1282         if (!usb_endpoint_dir_in(epread)) {
1283                 /* descriptors are swapped */
1284                 dev_dbg(&intf->dev,
1285                         "The data interface has switched endpoints\n");
1286                 swap(epread, epwrite);
1287         }
1288 made_compressed_probe:
1289         dev_dbg(&intf->dev, "interfaces are valid\n");
1290
1291         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1292         if (acm == NULL)
1293                 goto alloc_fail;
1294
1295         tty_port_init(&acm->port);
1296         acm->port.ops = &acm_port_ops;
1297
1298         minor = acm_alloc_minor(acm);
1299         if (minor < 0)
1300                 goto alloc_fail1;
1301
1302         ctrlsize = usb_endpoint_maxp(epctrl);
1303         readsize = usb_endpoint_maxp(epread) *
1304                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1305         acm->combined_interfaces = combined_interfaces;
1306         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1307         acm->control = control_interface;
1308         acm->data = data_interface;
1309         acm->minor = minor;
1310         acm->dev = usb_dev;
1311         if (h.usb_cdc_acm_descriptor)
1312                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1313         if (quirks & NO_CAP_LINE)
1314                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1315         acm->ctrlsize = ctrlsize;
1316         acm->readsize = readsize;
1317         acm->rx_buflimit = num_rx_buf;
1318         INIT_WORK(&acm->work, acm_softint);
1319         init_waitqueue_head(&acm->wioctl);
1320         spin_lock_init(&acm->write_lock);
1321         spin_lock_init(&acm->read_lock);
1322         mutex_init(&acm->mutex);
1323         if (usb_endpoint_xfer_int(epread)) {
1324                 acm->bInterval = epread->bInterval;
1325                 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1326         } else {
1327                 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1328         }
1329         if (usb_endpoint_xfer_int(epwrite))
1330                 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1331         else
1332                 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1333         init_usb_anchor(&acm->delayed);
1334         acm->quirks = quirks;
1335
1336         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1337         if (!buf)
1338                 goto alloc_fail1;
1339         acm->ctrl_buffer = buf;
1340
1341         if (acm_write_buffers_alloc(acm) < 0)
1342                 goto alloc_fail2;
1343
1344         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1345         if (!acm->ctrlurb)
1346                 goto alloc_fail3;
1347
1348         for (i = 0; i < num_rx_buf; i++) {
1349                 struct acm_rb *rb = &(acm->read_buffers[i]);
1350                 struct urb *urb;
1351
1352                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1353                                                                 &rb->dma);
1354                 if (!rb->base)
1355                         goto alloc_fail4;
1356                 rb->index = i;
1357                 rb->instance = acm;
1358
1359                 urb = usb_alloc_urb(0, GFP_KERNEL);
1360                 if (!urb)
1361                         goto alloc_fail4;
1362
1363                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1364                 urb->transfer_dma = rb->dma;
1365                 if (usb_endpoint_xfer_int(epread))
1366                         usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1367                                          acm->readsize,
1368                                          acm_read_bulk_callback, rb,
1369                                          acm->bInterval);
1370                 else
1371                         usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1372                                           acm->readsize,
1373                                           acm_read_bulk_callback, rb);
1374
1375                 acm->read_urbs[i] = urb;
1376                 __set_bit(i, &acm->read_urbs_free);
1377         }
1378         for (i = 0; i < ACM_NW; i++) {
1379                 struct acm_wb *snd = &(acm->wb[i]);
1380
1381                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1382                 if (snd->urb == NULL)
1383                         goto alloc_fail5;
1384
1385                 if (usb_endpoint_xfer_int(epwrite))
1386                         usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1387                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1388                 else
1389                         usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1390                                 NULL, acm->writesize, acm_write_bulk, snd);
1391                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1392                 if (quirks & SEND_ZERO_PACKET)
1393                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1394                 snd->instance = acm;
1395         }
1396
1397         usb_set_intfdata(intf, acm);
1398
1399         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1400         if (i < 0)
1401                 goto alloc_fail5;
1402
1403         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1404                 struct usb_cdc_country_functional_desc * cfd =
1405                                         h.usb_cdc_country_functional_desc;
1406
1407                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1408                 if (!acm->country_codes)
1409                         goto skip_countries;
1410                 acm->country_code_size = cfd->bLength - 4;
1411                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1412                                                         cfd->bLength - 4);
1413                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1414
1415                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1416                 if (i < 0) {
1417                         kfree(acm->country_codes);
1418                         acm->country_codes = NULL;
1419                         acm->country_code_size = 0;
1420                         goto skip_countries;
1421                 }
1422
1423                 i = device_create_file(&intf->dev,
1424                                                 &dev_attr_iCountryCodeRelDate);
1425                 if (i < 0) {
1426                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1427                         kfree(acm->country_codes);
1428                         acm->country_codes = NULL;
1429                         acm->country_code_size = 0;
1430                         goto skip_countries;
1431                 }
1432         }
1433
1434 skip_countries:
1435         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1436                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1437                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1438                          /* works around buggy devices */
1439                          epctrl->bInterval ? epctrl->bInterval : 16);
1440         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1441         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1442         acm->notification_buffer = NULL;
1443         acm->nb_index = 0;
1444         acm->nb_size = 0;
1445
1446         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1447
1448         acm->line.dwDTERate = cpu_to_le32(9600);
1449         acm->line.bDataBits = 8;
1450         acm_set_line(acm, &acm->line);
1451
1452         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1453         usb_set_intfdata(data_interface, acm);
1454
1455         usb_get_intf(control_interface);
1456         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1457                         &control_interface->dev);
1458         if (IS_ERR(tty_dev)) {
1459                 rv = PTR_ERR(tty_dev);
1460                 goto alloc_fail6;
1461         }
1462
1463         if (quirks & CLEAR_HALT_CONDITIONS) {
1464                 usb_clear_halt(usb_dev, acm->in);
1465                 usb_clear_halt(usb_dev, acm->out);
1466         }
1467
1468         return 0;
1469 alloc_fail6:
1470         if (acm->country_codes) {
1471                 device_remove_file(&acm->control->dev,
1472                                 &dev_attr_wCountryCodes);
1473                 device_remove_file(&acm->control->dev,
1474                                 &dev_attr_iCountryCodeRelDate);
1475                 kfree(acm->country_codes);
1476         }
1477         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1478 alloc_fail5:
1479         usb_set_intfdata(intf, NULL);
1480         for (i = 0; i < ACM_NW; i++)
1481                 usb_free_urb(acm->wb[i].urb);
1482 alloc_fail4:
1483         for (i = 0; i < num_rx_buf; i++)
1484                 usb_free_urb(acm->read_urbs[i]);
1485         acm_read_buffers_free(acm);
1486         usb_free_urb(acm->ctrlurb);
1487 alloc_fail3:
1488         acm_write_buffers_free(acm);
1489 alloc_fail2:
1490         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1491 alloc_fail1:
1492         tty_port_put(&acm->port);
1493 alloc_fail:
1494         return rv;
1495 }
1496
1497 static void acm_disconnect(struct usb_interface *intf)
1498 {
1499         struct acm *acm = usb_get_intfdata(intf);
1500         struct tty_struct *tty;
1501         int i;
1502
1503         /* sibling interface is already cleaning up */
1504         if (!acm)
1505                 return;
1506
1507         mutex_lock(&acm->mutex);
1508         acm->disconnected = true;
1509         if (acm->country_codes) {
1510                 device_remove_file(&acm->control->dev,
1511                                 &dev_attr_wCountryCodes);
1512                 device_remove_file(&acm->control->dev,
1513                                 &dev_attr_iCountryCodeRelDate);
1514         }
1515         wake_up_all(&acm->wioctl);
1516         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1517         usb_set_intfdata(acm->control, NULL);
1518         usb_set_intfdata(acm->data, NULL);
1519         mutex_unlock(&acm->mutex);
1520
1521         tty = tty_port_tty_get(&acm->port);
1522         if (tty) {
1523                 tty_vhangup(tty);
1524                 tty_kref_put(tty);
1525         }
1526
1527         acm_kill_urbs(acm);
1528         cancel_work_sync(&acm->work);
1529
1530         tty_unregister_device(acm_tty_driver, acm->minor);
1531
1532         usb_free_urb(acm->ctrlurb);
1533         for (i = 0; i < ACM_NW; i++)
1534                 usb_free_urb(acm->wb[i].urb);
1535         for (i = 0; i < acm->rx_buflimit; i++)
1536                 usb_free_urb(acm->read_urbs[i]);
1537         acm_write_buffers_free(acm);
1538         usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1539         acm_read_buffers_free(acm);
1540
1541         kfree(acm->notification_buffer);
1542
1543         if (!acm->combined_interfaces)
1544                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1545                                         acm->data : acm->control);
1546
1547         tty_port_put(&acm->port);
1548 }
1549
1550 #ifdef CONFIG_PM
1551 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1552 {
1553         struct acm *acm = usb_get_intfdata(intf);
1554         int cnt;
1555
1556         spin_lock_irq(&acm->write_lock);
1557         if (PMSG_IS_AUTO(message)) {
1558                 if (acm->transmitting) {
1559                         spin_unlock_irq(&acm->write_lock);
1560                         return -EBUSY;
1561                 }
1562         }
1563         cnt = acm->susp_count++;
1564         spin_unlock_irq(&acm->write_lock);
1565
1566         if (cnt)
1567                 return 0;
1568
1569         acm_kill_urbs(acm);
1570         cancel_work_sync(&acm->work);
1571
1572         return 0;
1573 }
1574
1575 static int acm_resume(struct usb_interface *intf)
1576 {
1577         struct acm *acm = usb_get_intfdata(intf);
1578         struct urb *urb;
1579         int rv = 0;
1580
1581         spin_lock_irq(&acm->write_lock);
1582
1583         if (--acm->susp_count)
1584                 goto out;
1585
1586         if (tty_port_initialized(&acm->port)) {
1587                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1588
1589                 for (;;) {
1590                         urb = usb_get_from_anchor(&acm->delayed);
1591                         if (!urb)
1592                                 break;
1593
1594                         acm_start_wb(acm, urb->context);
1595                 }
1596
1597                 /*
1598                  * delayed error checking because we must
1599                  * do the write path at all cost
1600                  */
1601                 if (rv < 0)
1602                         goto out;
1603
1604                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1605         }
1606 out:
1607         spin_unlock_irq(&acm->write_lock);
1608
1609         return rv;
1610 }
1611
1612 static int acm_reset_resume(struct usb_interface *intf)
1613 {
1614         struct acm *acm = usb_get_intfdata(intf);
1615
1616         if (tty_port_initialized(&acm->port))
1617                 tty_port_tty_hangup(&acm->port, false);
1618
1619         return acm_resume(intf);
1620 }
1621
1622 #endif /* CONFIG_PM */
1623
1624 static int acm_pre_reset(struct usb_interface *intf)
1625 {
1626         struct acm *acm = usb_get_intfdata(intf);
1627
1628         clear_bit(EVENT_RX_STALL, &acm->flags);
1629         acm->nb_index = 0; /* pending control transfers are lost */
1630
1631         return 0;
1632 }
1633
1634 #define NOKIA_PCSUITE_ACM_INFO(x) \
1635                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1636                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1637                 USB_CDC_ACM_PROTO_VENDOR)
1638
1639 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1640                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1641                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1642                 USB_CDC_ACM_PROTO_VENDOR)
1643
1644 /*
1645  * USB driver structure.
1646  */
1647
1648 static const struct usb_device_id acm_ids[] = {
1649         /* quirky and broken devices */
1650         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1651         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1652         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1653         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1654         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1655         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1656         },
1657         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1658         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1659         },
1660         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1661         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1662         },
1663         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1664         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1665         },
1666         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1667         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1668         },
1669         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1670         .driver_info = SINGLE_RX_URB,
1671         },
1672         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1673         .driver_info = SINGLE_RX_URB, /* firmware bug */
1674         },
1675         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1676         .driver_info = SINGLE_RX_URB, /* firmware bug */
1677         },
1678         { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1679         .driver_info = SINGLE_RX_URB,
1680         },
1681         { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1682         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1683         },
1684         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1685         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1686         },
1687         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1688         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1689         },
1690         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1691         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1692         },
1693         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1694         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1695         },
1696         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1697         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1698         },
1699         { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1700         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1701         },
1702         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1703         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1704         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1705         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1706         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1707         },
1708         /* Motorola H24 HSPA module: */
1709         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1710         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1711         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1712         },
1713         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1714         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1715         },
1716         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1717         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1718         },
1719         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1720         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1721         },
1722         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1723         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1724         },
1725         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1726         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1727         },
1728         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1729         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1730         },
1731
1732         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1733         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1734                                            data interface instead of
1735                                            communications interface.
1736                                            Maybe we should define a new
1737                                            quirk for this. */
1738         },
1739         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1740         .driver_info = NO_UNION_NORMAL,
1741         },
1742         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1743         .driver_info = NO_UNION_NORMAL,
1744         },
1745         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1746         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1747         },
1748         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1749         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1750         },
1751         { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1752         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1753         },
1754         { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1755         .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1756         },
1757         { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1758         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1759         },
1760
1761         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1762         .driver_info = CLEAR_HALT_CONDITIONS,
1763         },
1764
1765         /* Nokia S60 phones expose two ACM channels. The first is
1766          * a modem and is picked up by the standard AT-command
1767          * information below. The second is 'vendor-specific' but
1768          * is treated as a serial device at the S60 end, so we want
1769          * to expose it on Linux too. */
1770         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1771         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1772         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1773         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1774         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1775         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1776         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1777         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1778         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1779         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1780         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1781         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1782         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1783         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1784         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1785         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1786         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1787         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1788         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1789         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1790         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1791         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1792         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1793         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1794         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1795         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1796         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1797         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1798         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1799         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1800         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1801         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1802         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1803         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1804         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1805         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1806         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1807         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1808         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1809         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1810         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1811         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1812         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1813         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1814         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1815         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1816         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1817         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1818         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1819         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1820         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1821         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1822         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1823         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1824         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1825         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1826         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1827         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1828
1829         /* Support for Owen devices */
1830         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1831
1832         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1833
1834         /* Support for Droids MuIn LCD */
1835         { USB_DEVICE(0x04d8, 0x000b),
1836         .driver_info = NO_DATA_INTERFACE,
1837         },
1838
1839 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1840         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1841         .driver_info = IGNORE_DEVICE,
1842         },
1843         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1844         .driver_info = IGNORE_DEVICE,
1845         },
1846 #endif
1847
1848         /*Samsung phone in firmware update mode */
1849         { USB_DEVICE(0x04e8, 0x685d),
1850         .driver_info = IGNORE_DEVICE,
1851         },
1852
1853         /* Exclude Infineon Flash Loader utility */
1854         { USB_DEVICE(0x058b, 0x0041),
1855         .driver_info = IGNORE_DEVICE,
1856         },
1857
1858         /* control interfaces without any protocol set */
1859         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1860                 USB_CDC_PROTO_NONE) },
1861
1862         /* control interfaces with various AT-command sets */
1863         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1864                 USB_CDC_ACM_PROTO_AT_V25TER) },
1865         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1866                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1867         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1868                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1869         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1870                 USB_CDC_ACM_PROTO_AT_GSM) },
1871         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1872                 USB_CDC_ACM_PROTO_AT_3G) },
1873         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1874                 USB_CDC_ACM_PROTO_AT_CDMA) },
1875
1876         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1877         .driver_info = SEND_ZERO_PACKET,
1878         },
1879
1880         { }
1881 };
1882
1883 MODULE_DEVICE_TABLE(usb, acm_ids);
1884
1885 static struct usb_driver acm_driver = {
1886         .name =         "cdc_acm",
1887         .probe =        acm_probe,
1888         .disconnect =   acm_disconnect,
1889 #ifdef CONFIG_PM
1890         .suspend =      acm_suspend,
1891         .resume =       acm_resume,
1892         .reset_resume = acm_reset_resume,
1893 #endif
1894         .pre_reset =    acm_pre_reset,
1895         .id_table =     acm_ids,
1896 #ifdef CONFIG_PM
1897         .supports_autosuspend = 1,
1898 #endif
1899         .disable_hub_initiated_lpm = 1,
1900 };
1901
1902 /*
1903  * TTY driver structures.
1904  */
1905
1906 static const struct tty_operations acm_ops = {
1907         .install =              acm_tty_install,
1908         .open =                 acm_tty_open,
1909         .close =                acm_tty_close,
1910         .cleanup =              acm_tty_cleanup,
1911         .hangup =               acm_tty_hangup,
1912         .write =                acm_tty_write,
1913         .write_room =           acm_tty_write_room,
1914         .ioctl =                acm_tty_ioctl,
1915         .throttle =             acm_tty_throttle,
1916         .unthrottle =           acm_tty_unthrottle,
1917         .chars_in_buffer =      acm_tty_chars_in_buffer,
1918         .break_ctl =            acm_tty_break_ctl,
1919         .set_termios =          acm_tty_set_termios,
1920         .tiocmget =             acm_tty_tiocmget,
1921         .tiocmset =             acm_tty_tiocmset,
1922         .get_serial =           get_serial_info,
1923         .set_serial =           set_serial_info,
1924         .get_icount =           acm_tty_get_icount,
1925 };
1926
1927 /*
1928  * Init / exit.
1929  */
1930
1931 static int __init acm_init(void)
1932 {
1933         int retval;
1934         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1935         if (!acm_tty_driver)
1936                 return -ENOMEM;
1937         acm_tty_driver->driver_name = "acm",
1938         acm_tty_driver->name = "ttyACM",
1939         acm_tty_driver->major = ACM_TTY_MAJOR,
1940         acm_tty_driver->minor_start = 0,
1941         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1942         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1943         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1944         acm_tty_driver->init_termios = tty_std_termios;
1945         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1946                                                                 HUPCL | CLOCAL;
1947         tty_set_operations(acm_tty_driver, &acm_ops);
1948
1949         retval = tty_register_driver(acm_tty_driver);
1950         if (retval) {
1951                 put_tty_driver(acm_tty_driver);
1952                 return retval;
1953         }
1954
1955         retval = usb_register(&acm_driver);
1956         if (retval) {
1957                 tty_unregister_driver(acm_tty_driver);
1958                 put_tty_driver(acm_tty_driver);
1959                 return retval;
1960         }
1961
1962         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1963
1964         return 0;
1965 }
1966
1967 static void __exit acm_exit(void)
1968 {
1969         usb_deregister(&acm_driver);
1970         tty_unregister_driver(acm_tty_driver);
1971         put_tty_driver(acm_tty_driver);
1972         idr_destroy(&acm_minors);
1973 }
1974
1975 module_init(acm_init);
1976 module_exit(acm_exit);
1977
1978 MODULE_AUTHOR(DRIVER_AUTHOR);
1979 MODULE_DESCRIPTION(DRIVER_DESC);
1980 MODULE_LICENSE("GPL");
1981 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);