Merge branch 'stable-3.14' of git://git.infradead.org/users/pcmoore/selinux into...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / usb / class / cdc-acm.c
1 /*
2  * cdc-acm.c
3  *
4  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
5  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
6  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
8  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
9  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
10  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
11  *
12  * USB Abstract Control Model driver for USB modems and ISDN adapters
13  *
14  * Sponsored by SuSE
15  *
16  * This program is free software; you can redistribute it and/or modify
17  * it under the terms of the GNU General Public License as published by
18  * the Free Software Foundation; either version 2 of the License, or
19  * (at your option) any later version.
20  *
21  * This program is distributed in the hope that it will be useful,
22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24  * GNU General Public License for more details.
25  *
26  * You should have received a copy of the GNU General Public License
27  * along with this program; if not, write to the Free Software
28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29  */
30
31 #undef DEBUG
32 #undef VERBOSE_DEBUG
33
34 #include <linux/kernel.h>
35 #include <linux/errno.h>
36 #include <linux/init.h>
37 #include <linux/slab.h>
38 #include <linux/tty.h>
39 #include <linux/serial.h>
40 #include <linux/tty_driver.h>
41 #include <linux/tty_flip.h>
42 #include <linux/module.h>
43 #include <linux/mutex.h>
44 #include <linux/uaccess.h>
45 #include <linux/usb.h>
46 #include <linux/usb/cdc.h>
47 #include <asm/byteorder.h>
48 #include <asm/unaligned.h>
49 #include <linux/list.h>
50
51 #include "cdc-acm.h"
52
53
54 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
55 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
56
57 static struct usb_driver acm_driver;
58 static struct tty_driver *acm_tty_driver;
59 static struct acm *acm_table[ACM_TTY_MINORS];
60
61 static DEFINE_MUTEX(acm_table_lock);
62
63 /*
64  * acm_table accessors
65  */
66
67 /*
68  * Look up an ACM structure by index. If found and not disconnected, increment
69  * its refcount and return it with its mutex held.
70  */
71 static struct acm *acm_get_by_index(unsigned index)
72 {
73         struct acm *acm;
74
75         mutex_lock(&acm_table_lock);
76         acm = acm_table[index];
77         if (acm) {
78                 mutex_lock(&acm->mutex);
79                 if (acm->disconnected) {
80                         mutex_unlock(&acm->mutex);
81                         acm = NULL;
82                 } else {
83                         tty_port_get(&acm->port);
84                         mutex_unlock(&acm->mutex);
85                 }
86         }
87         mutex_unlock(&acm_table_lock);
88         return acm;
89 }
90
91 /*
92  * Try to find an available minor number and if found, associate it with 'acm'.
93  */
94 static int acm_alloc_minor(struct acm *acm)
95 {
96         int minor;
97
98         mutex_lock(&acm_table_lock);
99         for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
100                 if (!acm_table[minor]) {
101                         acm_table[minor] = acm;
102                         break;
103                 }
104         }
105         mutex_unlock(&acm_table_lock);
106
107         return minor;
108 }
109
110 /* Release the minor number associated with 'acm'.  */
111 static void acm_release_minor(struct acm *acm)
112 {
113         mutex_lock(&acm_table_lock);
114         acm_table[acm->minor] = NULL;
115         mutex_unlock(&acm_table_lock);
116 }
117
118 /*
119  * Functions for ACM control messages.
120  */
121
122 static int acm_ctrl_msg(struct acm *acm, int request, int value,
123                                                         void *buf, int len)
124 {
125         int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
126                 request, USB_RT_ACM, value,
127                 acm->control->altsetting[0].desc.bInterfaceNumber,
128                 buf, len, 5000);
129         dev_dbg(&acm->control->dev,
130                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
131                         __func__, request, value, len, retval);
132         return retval < 0 ? retval : 0;
133 }
134
135 /* devices aren't required to support these requests.
136  * the cdc acm descriptor tells whether they do...
137  */
138 #define acm_set_control(acm, control) \
139         acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
140 #define acm_set_line(acm, line) \
141         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
142 #define acm_send_break(acm, ms) \
143         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
144
145 /*
146  * Write buffer management.
147  * All of these assume proper locks taken by the caller.
148  */
149
150 static int acm_wb_alloc(struct acm *acm)
151 {
152         int i, wbn;
153         struct acm_wb *wb;
154
155         wbn = 0;
156         i = 0;
157         for (;;) {
158                 wb = &acm->wb[wbn];
159                 if (!wb->use) {
160                         wb->use = 1;
161                         return wbn;
162                 }
163                 wbn = (wbn + 1) % ACM_NW;
164                 if (++i >= ACM_NW)
165                         return -1;
166         }
167 }
168
169 static int acm_wb_is_avail(struct acm *acm)
170 {
171         int i, n;
172         unsigned long flags;
173
174         n = ACM_NW;
175         spin_lock_irqsave(&acm->write_lock, flags);
176         for (i = 0; i < ACM_NW; i++)
177                 n -= acm->wb[i].use;
178         spin_unlock_irqrestore(&acm->write_lock, flags);
179         return n;
180 }
181
182 /*
183  * Finish write. Caller must hold acm->write_lock
184  */
185 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
186 {
187         wb->use = 0;
188         acm->transmitting--;
189         usb_autopm_put_interface_async(acm->control);
190 }
191
192 /*
193  * Poke write.
194  *
195  * the caller is responsible for locking
196  */
197
198 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
199 {
200         int rc;
201
202         acm->transmitting++;
203
204         wb->urb->transfer_buffer = wb->buf;
205         wb->urb->transfer_dma = wb->dmah;
206         wb->urb->transfer_buffer_length = wb->len;
207         wb->urb->dev = acm->dev;
208
209         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
210         if (rc < 0) {
211                 dev_err(&acm->data->dev,
212                         "%s - usb_submit_urb(write bulk) failed: %d\n",
213                         __func__, rc);
214                 acm_write_done(acm, wb);
215         }
216         return rc;
217 }
218
219 /*
220  * attributes exported through sysfs
221  */
222 static ssize_t show_caps
223 (struct device *dev, struct device_attribute *attr, char *buf)
224 {
225         struct usb_interface *intf = to_usb_interface(dev);
226         struct acm *acm = usb_get_intfdata(intf);
227
228         return sprintf(buf, "%d", acm->ctrl_caps);
229 }
230 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
231
232 static ssize_t show_country_codes
233 (struct device *dev, struct device_attribute *attr, char *buf)
234 {
235         struct usb_interface *intf = to_usb_interface(dev);
236         struct acm *acm = usb_get_intfdata(intf);
237
238         memcpy(buf, acm->country_codes, acm->country_code_size);
239         return acm->country_code_size;
240 }
241
242 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
243
244 static ssize_t show_country_rel_date
245 (struct device *dev, struct device_attribute *attr, char *buf)
246 {
247         struct usb_interface *intf = to_usb_interface(dev);
248         struct acm *acm = usb_get_intfdata(intf);
249
250         return sprintf(buf, "%d", acm->country_rel_date);
251 }
252
253 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
254 /*
255  * Interrupt handlers for various ACM device responses
256  */
257
258 /* control interface reports status changes with "interrupt" transfers */
259 static void acm_ctrl_irq(struct urb *urb)
260 {
261         struct acm *acm = urb->context;
262         struct usb_cdc_notification *dr = urb->transfer_buffer;
263         unsigned char *data;
264         int newctrl;
265         int difference;
266         int retval;
267         int status = urb->status;
268
269         switch (status) {
270         case 0:
271                 /* success */
272                 break;
273         case -ECONNRESET:
274         case -ENOENT:
275         case -ESHUTDOWN:
276                 /* this urb is terminated, clean up */
277                 dev_dbg(&acm->control->dev,
278                                 "%s - urb shutting down with status: %d\n",
279                                 __func__, status);
280                 return;
281         default:
282                 dev_dbg(&acm->control->dev,
283                                 "%s - nonzero urb status received: %d\n",
284                                 __func__, status);
285                 goto exit;
286         }
287
288         usb_mark_last_busy(acm->dev);
289
290         data = (unsigned char *)(dr + 1);
291         switch (dr->bNotificationType) {
292         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
293                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
294                                                         __func__, dr->wValue);
295                 break;
296
297         case USB_CDC_NOTIFY_SERIAL_STATE:
298                 newctrl = get_unaligned_le16(data);
299
300                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
301                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
302                                         __func__);
303                         tty_port_tty_hangup(&acm->port, false);
304                 }
305
306                 difference = acm->ctrlin ^ newctrl;
307                 spin_lock(&acm->read_lock);
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_BRK)
314                         acm->iocount.brk++;
315                 if (difference & ACM_CTRL_RI)
316                         acm->iocount.rng++;
317                 if (difference & ACM_CTRL_DCD)
318                         acm->iocount.dcd++;
319                 if (difference & ACM_CTRL_FRAMING)
320                         acm->iocount.frame++;
321                 if (difference & ACM_CTRL_PARITY)
322                         acm->iocount.parity++;
323                 if (difference & ACM_CTRL_OVERRUN)
324                         acm->iocount.overrun++;
325                 spin_unlock(&acm->read_lock);
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 "
335                         "len %d data0 %d data1 %d\n",
336                         __func__,
337                         dr->bNotificationType, dr->wIndex,
338                         dr->wLength, data[0], data[1]);
339                 break;
340         }
341 exit:
342         retval = usb_submit_urb(urb, GFP_ATOMIC);
343         if (retval)
344                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
345                                                         __func__, retval);
346 }
347
348 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
349 {
350         int res;
351
352         if (!test_and_clear_bit(index, &acm->read_urbs_free))
353                 return 0;
354
355         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
356
357         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
358         if (res) {
359                 if (res != -EPERM) {
360                         dev_err(&acm->data->dev,
361                                         "%s - usb_submit_urb failed: %d\n",
362                                         __func__, res);
363                 }
364                 set_bit(index, &acm->read_urbs_free);
365                 return res;
366         }
367
368         return 0;
369 }
370
371 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
372 {
373         int res;
374         int i;
375
376         for (i = 0; i < acm->rx_buflimit; ++i) {
377                 res = acm_submit_read_urb(acm, i, mem_flags);
378                 if (res)
379                         return res;
380         }
381
382         return 0;
383 }
384
385 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
386 {
387         if (!urb->actual_length)
388                 return;
389
390         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
391                         urb->actual_length);
392         tty_flip_buffer_push(&acm->port);
393 }
394
395 static void acm_read_bulk_callback(struct urb *urb)
396 {
397         struct acm_rb *rb = urb->context;
398         struct acm *acm = rb->instance;
399         unsigned long flags;
400
401         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
402                                         rb->index, urb->actual_length);
403         set_bit(rb->index, &acm->read_urbs_free);
404
405         if (!acm->dev) {
406                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
407                 return;
408         }
409         usb_mark_last_busy(acm->dev);
410
411         if (urb->status) {
412                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
413                                                         __func__, urb->status);
414                 return;
415         }
416         acm_process_read_urb(acm, urb);
417
418         /* throttle device if requested by tty */
419         spin_lock_irqsave(&acm->read_lock, flags);
420         acm->throttled = acm->throttle_req;
421         if (!acm->throttled && !acm->susp_count) {
422                 spin_unlock_irqrestore(&acm->read_lock, flags);
423                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
424         } else {
425                 spin_unlock_irqrestore(&acm->read_lock, flags);
426         }
427 }
428
429 /* data interface wrote those outgoing bytes */
430 static void acm_write_bulk(struct urb *urb)
431 {
432         struct acm_wb *wb = urb->context;
433         struct acm *acm = wb->instance;
434         unsigned long flags;
435
436         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
437                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
438                         __func__,
439                         urb->actual_length,
440                         urb->transfer_buffer_length,
441                         urb->status);
442
443         spin_lock_irqsave(&acm->write_lock, flags);
444         acm_write_done(acm, wb);
445         spin_unlock_irqrestore(&acm->write_lock, flags);
446         schedule_work(&acm->work);
447 }
448
449 static void acm_softint(struct work_struct *work)
450 {
451         struct acm *acm = container_of(work, struct acm, work);
452
453         dev_vdbg(&acm->data->dev, "%s\n", __func__);
454
455         tty_port_tty_wakeup(&acm->port);
456 }
457
458 /*
459  * TTY handlers
460  */
461
462 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
463 {
464         struct acm *acm;
465         int retval;
466
467         dev_dbg(tty->dev, "%s\n", __func__);
468
469         acm = acm_get_by_index(tty->index);
470         if (!acm)
471                 return -ENODEV;
472
473         retval = tty_standard_install(driver, tty);
474         if (retval)
475                 goto error_init_termios;
476
477         tty->driver_data = acm;
478
479         return 0;
480
481 error_init_termios:
482         tty_port_put(&acm->port);
483         return retval;
484 }
485
486 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
487 {
488         struct acm *acm = tty->driver_data;
489
490         dev_dbg(tty->dev, "%s\n", __func__);
491
492         return tty_port_open(&acm->port, tty, filp);
493 }
494
495 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
496 {
497         struct acm *acm = container_of(port, struct acm, port);
498         int retval = -ENODEV;
499
500         dev_dbg(&acm->control->dev, "%s\n", __func__);
501
502         mutex_lock(&acm->mutex);
503         if (acm->disconnected)
504                 goto disconnected;
505
506         retval = usb_autopm_get_interface(acm->control);
507         if (retval)
508                 goto error_get_interface;
509
510         /*
511          * FIXME: Why do we need this? Allocating 64K of physically contiguous
512          * memory is really nasty...
513          */
514         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
515         acm->control->needs_remote_wakeup = 1;
516
517         acm->ctrlurb->dev = acm->dev;
518         if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
519                 dev_err(&acm->control->dev,
520                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
521                 goto error_submit_urb;
522         }
523
524         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
525         if (acm_set_control(acm, acm->ctrlout) < 0 &&
526             (acm->ctrl_caps & USB_CDC_CAP_LINE))
527                 goto error_set_control;
528
529         usb_autopm_put_interface(acm->control);
530
531         /*
532          * Unthrottle device in case the TTY was closed while throttled.
533          */
534         spin_lock_irq(&acm->read_lock);
535         acm->throttled = 0;
536         acm->throttle_req = 0;
537         spin_unlock_irq(&acm->read_lock);
538
539         if (acm_submit_read_urbs(acm, GFP_KERNEL))
540                 goto error_submit_read_urbs;
541
542         mutex_unlock(&acm->mutex);
543
544         return 0;
545
546 error_submit_read_urbs:
547         acm->ctrlout = 0;
548         acm_set_control(acm, acm->ctrlout);
549 error_set_control:
550         usb_kill_urb(acm->ctrlurb);
551 error_submit_urb:
552         usb_autopm_put_interface(acm->control);
553 error_get_interface:
554 disconnected:
555         mutex_unlock(&acm->mutex);
556         return retval;
557 }
558
559 static void acm_port_destruct(struct tty_port *port)
560 {
561         struct acm *acm = container_of(port, struct acm, port);
562
563         dev_dbg(&acm->control->dev, "%s\n", __func__);
564
565         acm_release_minor(acm);
566         usb_put_intf(acm->control);
567         kfree(acm->country_codes);
568         kfree(acm);
569 }
570
571 static void acm_port_shutdown(struct tty_port *port)
572 {
573         struct acm *acm = container_of(port, struct acm, port);
574         int i;
575
576         dev_dbg(&acm->control->dev, "%s\n", __func__);
577
578         mutex_lock(&acm->mutex);
579         if (!acm->disconnected) {
580                 usb_autopm_get_interface(acm->control);
581                 acm_set_control(acm, acm->ctrlout = 0);
582                 usb_kill_urb(acm->ctrlurb);
583                 for (i = 0; i < ACM_NW; i++)
584                         usb_kill_urb(acm->wb[i].urb);
585                 for (i = 0; i < acm->rx_buflimit; i++)
586                         usb_kill_urb(acm->read_urbs[i]);
587                 acm->control->needs_remote_wakeup = 0;
588                 usb_autopm_put_interface(acm->control);
589         }
590         mutex_unlock(&acm->mutex);
591 }
592
593 static void acm_tty_cleanup(struct tty_struct *tty)
594 {
595         struct acm *acm = tty->driver_data;
596         dev_dbg(&acm->control->dev, "%s\n", __func__);
597         tty_port_put(&acm->port);
598 }
599
600 static void acm_tty_hangup(struct tty_struct *tty)
601 {
602         struct acm *acm = tty->driver_data;
603         dev_dbg(&acm->control->dev, "%s\n", __func__);
604         tty_port_hangup(&acm->port);
605 }
606
607 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
608 {
609         struct acm *acm = tty->driver_data;
610         dev_dbg(&acm->control->dev, "%s\n", __func__);
611         tty_port_close(&acm->port, tty, filp);
612 }
613
614 static int acm_tty_write(struct tty_struct *tty,
615                                         const unsigned char *buf, int count)
616 {
617         struct acm *acm = tty->driver_data;
618         int stat;
619         unsigned long flags;
620         int wbn;
621         struct acm_wb *wb;
622
623         if (!count)
624                 return 0;
625
626         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
627
628         spin_lock_irqsave(&acm->write_lock, flags);
629         wbn = acm_wb_alloc(acm);
630         if (wbn < 0) {
631                 spin_unlock_irqrestore(&acm->write_lock, flags);
632                 return 0;
633         }
634         wb = &acm->wb[wbn];
635
636         if (!acm->dev) {
637                 wb->use = 0;
638                 spin_unlock_irqrestore(&acm->write_lock, flags);
639                 return -ENODEV;
640         }
641
642         count = (count > acm->writesize) ? acm->writesize : count;
643         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
644         memcpy(wb->buf, buf, count);
645         wb->len = count;
646
647         usb_autopm_get_interface_async(acm->control);
648         if (acm->susp_count) {
649                 if (!acm->delayed_wb)
650                         acm->delayed_wb = wb;
651                 else
652                         usb_autopm_put_interface_async(acm->control);
653                 spin_unlock_irqrestore(&acm->write_lock, flags);
654                 return count;   /* A white lie */
655         }
656         usb_mark_last_busy(acm->dev);
657
658         stat = acm_start_wb(acm, wb);
659         spin_unlock_irqrestore(&acm->write_lock, flags);
660
661         if (stat < 0)
662                 return stat;
663         return count;
664 }
665
666 static int acm_tty_write_room(struct tty_struct *tty)
667 {
668         struct acm *acm = tty->driver_data;
669         /*
670          * Do not let the line discipline to know that we have a reserve,
671          * or it might get too enthusiastic.
672          */
673         return acm_wb_is_avail(acm) ? acm->writesize : 0;
674 }
675
676 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
677 {
678         struct acm *acm = tty->driver_data;
679         /*
680          * if the device was unplugged then any remaining characters fell out
681          * of the connector ;)
682          */
683         if (acm->disconnected)
684                 return 0;
685         /*
686          * This is inaccurate (overcounts), but it works.
687          */
688         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
689 }
690
691 static void acm_tty_throttle(struct tty_struct *tty)
692 {
693         struct acm *acm = tty->driver_data;
694
695         spin_lock_irq(&acm->read_lock);
696         acm->throttle_req = 1;
697         spin_unlock_irq(&acm->read_lock);
698 }
699
700 static void acm_tty_unthrottle(struct tty_struct *tty)
701 {
702         struct acm *acm = tty->driver_data;
703         unsigned int was_throttled;
704
705         spin_lock_irq(&acm->read_lock);
706         was_throttled = acm->throttled;
707         acm->throttled = 0;
708         acm->throttle_req = 0;
709         spin_unlock_irq(&acm->read_lock);
710
711         if (was_throttled)
712                 acm_submit_read_urbs(acm, GFP_KERNEL);
713 }
714
715 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
716 {
717         struct acm *acm = tty->driver_data;
718         int retval;
719
720         retval = acm_send_break(acm, state ? 0xffff : 0);
721         if (retval < 0)
722                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
723                                                                 __func__);
724         return retval;
725 }
726
727 static int acm_tty_tiocmget(struct tty_struct *tty)
728 {
729         struct acm *acm = tty->driver_data;
730
731         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
732                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
733                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
734                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
735                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
736                TIOCM_CTS;
737 }
738
739 static int acm_tty_tiocmset(struct tty_struct *tty,
740                             unsigned int set, unsigned int clear)
741 {
742         struct acm *acm = tty->driver_data;
743         unsigned int newctrl;
744
745         newctrl = acm->ctrlout;
746         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
747                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
748         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
749                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
750
751         newctrl = (newctrl & ~clear) | set;
752
753         if (acm->ctrlout == newctrl)
754                 return 0;
755         return acm_set_control(acm, acm->ctrlout = newctrl);
756 }
757
758 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
759 {
760         struct serial_struct tmp;
761
762         if (!info)
763                 return -EINVAL;
764
765         memset(&tmp, 0, sizeof(tmp));
766         tmp.flags = ASYNC_LOW_LATENCY;
767         tmp.xmit_fifo_size = acm->writesize;
768         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
769         tmp.close_delay = acm->port.close_delay / 10;
770         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
771                                 ASYNC_CLOSING_WAIT_NONE :
772                                 acm->port.closing_wait / 10;
773
774         if (copy_to_user(info, &tmp, sizeof(tmp)))
775                 return -EFAULT;
776         else
777                 return 0;
778 }
779
780 static int set_serial_info(struct acm *acm,
781                                 struct serial_struct __user *newinfo)
782 {
783         struct serial_struct new_serial;
784         unsigned int closing_wait, close_delay;
785         int retval = 0;
786
787         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
788                 return -EFAULT;
789
790         close_delay = new_serial.close_delay * 10;
791         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
792                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
793
794         mutex_lock(&acm->port.mutex);
795
796         if (!capable(CAP_SYS_ADMIN)) {
797                 if ((close_delay != acm->port.close_delay) ||
798                     (closing_wait != acm->port.closing_wait))
799                         retval = -EPERM;
800                 else
801                         retval = -EOPNOTSUPP;
802         } else {
803                 acm->port.close_delay  = close_delay;
804                 acm->port.closing_wait = closing_wait;
805         }
806
807         mutex_unlock(&acm->port.mutex);
808         return retval;
809 }
810
811 static int wait_serial_change(struct acm *acm, unsigned long arg)
812 {
813         int rv = 0;
814         DECLARE_WAITQUEUE(wait, current);
815         struct async_icount old, new;
816
817         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
818                 return -EINVAL;
819         do {
820                 spin_lock_irq(&acm->read_lock);
821                 old = acm->oldcount;
822                 new = acm->iocount;
823                 acm->oldcount = new;
824                 spin_unlock_irq(&acm->read_lock);
825
826                 if ((arg & TIOCM_DSR) &&
827                         old.dsr != new.dsr)
828                         break;
829                 if ((arg & TIOCM_CD)  &&
830                         old.dcd != new.dcd)
831                         break;
832                 if ((arg & TIOCM_RI) &&
833                         old.rng != new.rng)
834                         break;
835
836                 add_wait_queue(&acm->wioctl, &wait);
837                 set_current_state(TASK_INTERRUPTIBLE);
838                 schedule();
839                 remove_wait_queue(&acm->wioctl, &wait);
840                 if (acm->disconnected) {
841                         if (arg & TIOCM_CD)
842                                 break;
843                         else
844                                 rv = -ENODEV;
845                 } else {
846                         if (signal_pending(current))
847                                 rv = -ERESTARTSYS;
848                 }
849         } while (!rv);
850
851         
852
853         return rv;
854 }
855
856 static int get_serial_usage(struct acm *acm,
857                             struct serial_icounter_struct __user *count)
858 {
859         struct serial_icounter_struct icount;
860         int rv = 0;
861
862         memset(&icount, 0, sizeof(icount));
863         icount.dsr = acm->iocount.dsr;
864         icount.rng = acm->iocount.rng;
865         icount.dcd = acm->iocount.dcd;
866         icount.frame = acm->iocount.frame;
867         icount.overrun = acm->iocount.overrun;
868         icount.parity = acm->iocount.parity;
869         icount.brk = acm->iocount.brk;
870
871         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
872                 rv = -EFAULT;
873
874         return rv;
875 }
876
877 static int acm_tty_ioctl(struct tty_struct *tty,
878                                         unsigned int cmd, unsigned long arg)
879 {
880         struct acm *acm = tty->driver_data;
881         int rv = -ENOIOCTLCMD;
882
883         switch (cmd) {
884         case TIOCGSERIAL: /* gets serial port data */
885                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
886                 break;
887         case TIOCSSERIAL:
888                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
889                 break;
890         case TIOCMIWAIT:
891                 rv = usb_autopm_get_interface(acm->control);
892                 if (rv < 0) {
893                         rv = -EIO;
894                         break;
895                 }
896                 rv = wait_serial_change(acm, arg);
897                 usb_autopm_put_interface(acm->control);
898                 break;
899         case TIOCGICOUNT:
900                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
901                 break;
902         }
903
904         return rv;
905 }
906
907 static void acm_tty_set_termios(struct tty_struct *tty,
908                                                 struct ktermios *termios_old)
909 {
910         struct acm *acm = tty->driver_data;
911         struct ktermios *termios = &tty->termios;
912         struct usb_cdc_line_coding newline;
913         int newctrl = acm->ctrlout;
914
915         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
916         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
917         newline.bParityType = termios->c_cflag & PARENB ?
918                                 (termios->c_cflag & PARODD ? 1 : 2) +
919                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
920         switch (termios->c_cflag & CSIZE) {
921         case CS5:
922                 newline.bDataBits = 5;
923                 break;
924         case CS6:
925                 newline.bDataBits = 6;
926                 break;
927         case CS7:
928                 newline.bDataBits = 7;
929                 break;
930         case CS8:
931         default:
932                 newline.bDataBits = 8;
933                 break;
934         }
935         /* FIXME: Needs to clear unsupported bits in the termios */
936         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
937
938         if (!newline.dwDTERate) {
939                 newline.dwDTERate = acm->line.dwDTERate;
940                 newctrl &= ~ACM_CTRL_DTR;
941         } else
942                 newctrl |=  ACM_CTRL_DTR;
943
944         if (newctrl != acm->ctrlout)
945                 acm_set_control(acm, acm->ctrlout = newctrl);
946
947         if (memcmp(&acm->line, &newline, sizeof newline)) {
948                 memcpy(&acm->line, &newline, sizeof newline);
949                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
950                         __func__,
951                         le32_to_cpu(newline.dwDTERate),
952                         newline.bCharFormat, newline.bParityType,
953                         newline.bDataBits);
954                 acm_set_line(acm, &acm->line);
955         }
956 }
957
958 static const struct tty_port_operations acm_port_ops = {
959         .shutdown = acm_port_shutdown,
960         .activate = acm_port_activate,
961         .destruct = acm_port_destruct,
962 };
963
964 /*
965  * USB probe and disconnect routines.
966  */
967
968 /* Little helpers: write/read buffers free */
969 static void acm_write_buffers_free(struct acm *acm)
970 {
971         int i;
972         struct acm_wb *wb;
973         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
974
975         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
976                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
977 }
978
979 static void acm_read_buffers_free(struct acm *acm)
980 {
981         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
982         int i;
983
984         for (i = 0; i < acm->rx_buflimit; i++)
985                 usb_free_coherent(usb_dev, acm->readsize,
986                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
987 }
988
989 /* Little helper: write buffers allocate */
990 static int acm_write_buffers_alloc(struct acm *acm)
991 {
992         int i;
993         struct acm_wb *wb;
994
995         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
996                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
997                     &wb->dmah);
998                 if (!wb->buf) {
999                         while (i != 0) {
1000                                 --i;
1001                                 --wb;
1002                                 usb_free_coherent(acm->dev, acm->writesize,
1003                                     wb->buf, wb->dmah);
1004                         }
1005                         return -ENOMEM;
1006                 }
1007         }
1008         return 0;
1009 }
1010
1011 static int acm_probe(struct usb_interface *intf,
1012                      const struct usb_device_id *id)
1013 {
1014         struct usb_cdc_union_desc *union_header = NULL;
1015         struct usb_cdc_country_functional_desc *cfd = NULL;
1016         unsigned char *buffer = intf->altsetting->extra;
1017         int buflen = intf->altsetting->extralen;
1018         struct usb_interface *control_interface;
1019         struct usb_interface *data_interface;
1020         struct usb_endpoint_descriptor *epctrl = NULL;
1021         struct usb_endpoint_descriptor *epread = NULL;
1022         struct usb_endpoint_descriptor *epwrite = NULL;
1023         struct usb_device *usb_dev = interface_to_usbdev(intf);
1024         struct acm *acm;
1025         int minor;
1026         int ctrlsize, readsize;
1027         u8 *buf;
1028         u8 ac_management_function = 0;
1029         u8 call_management_function = 0;
1030         int call_interface_num = -1;
1031         int data_interface_num = -1;
1032         unsigned long quirks;
1033         int num_rx_buf;
1034         int i;
1035         int combined_interfaces = 0;
1036         struct device *tty_dev;
1037         int rv = -ENOMEM;
1038
1039         /* normal quirks */
1040         quirks = (unsigned long)id->driver_info;
1041
1042         if (quirks == IGNORE_DEVICE)
1043                 return -ENODEV;
1044
1045         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1046
1047         /* handle quirks deadly to normal probing*/
1048         if (quirks == NO_UNION_NORMAL) {
1049                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1050                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1051                 goto skip_normal_probe;
1052         }
1053
1054         /* normal probing*/
1055         if (!buffer) {
1056                 dev_err(&intf->dev, "Weird descriptor references\n");
1057                 return -EINVAL;
1058         }
1059
1060         if (!buflen) {
1061                 if (intf->cur_altsetting->endpoint &&
1062                                 intf->cur_altsetting->endpoint->extralen &&
1063                                 intf->cur_altsetting->endpoint->extra) {
1064                         dev_dbg(&intf->dev,
1065                                 "Seeking extra descriptors on endpoint\n");
1066                         buflen = intf->cur_altsetting->endpoint->extralen;
1067                         buffer = intf->cur_altsetting->endpoint->extra;
1068                 } else {
1069                         dev_err(&intf->dev,
1070                                 "Zero length descriptor references\n");
1071                         return -EINVAL;
1072                 }
1073         }
1074
1075         while (buflen > 0) {
1076                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1077                         dev_err(&intf->dev, "skipping garbage\n");
1078                         goto next_desc;
1079                 }
1080
1081                 switch (buffer[2]) {
1082                 case USB_CDC_UNION_TYPE: /* we've found it */
1083                         if (union_header) {
1084                                 dev_err(&intf->dev, "More than one "
1085                                         "union descriptor, skipping ...\n");
1086                                 goto next_desc;
1087                         }
1088                         union_header = (struct usb_cdc_union_desc *)buffer;
1089                         break;
1090                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1091                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1092                         break;
1093                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1094                         break; /* for now we ignore it */
1095                 case USB_CDC_ACM_TYPE:
1096                         ac_management_function = buffer[3];
1097                         break;
1098                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1099                         call_management_function = buffer[3];
1100                         call_interface_num = buffer[4];
1101                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1102                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1103                         break;
1104                 default:
1105                         /* there are LOTS more CDC descriptors that
1106                          * could legitimately be found here.
1107                          */
1108                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1109                                         "type %02x, length %d\n",
1110                                         buffer[2], buffer[0]);
1111                         break;
1112                 }
1113 next_desc:
1114                 buflen -= buffer[0];
1115                 buffer += buffer[0];
1116         }
1117
1118         if (!union_header) {
1119                 if (call_interface_num > 0) {
1120                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1121                         /* quirks for Droids MuIn LCD */
1122                         if (quirks & NO_DATA_INTERFACE)
1123                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1124                         else
1125                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1126                         control_interface = intf;
1127                 } else {
1128                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1129                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1130                                 return -ENODEV;
1131                         } else {
1132                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1133                                 combined_interfaces = 1;
1134                                 control_interface = data_interface = intf;
1135                                 goto look_for_collapsed_interface;
1136                         }
1137                 }
1138         } else {
1139                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1140                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1141                 if (!control_interface || !data_interface) {
1142                         dev_dbg(&intf->dev, "no interfaces\n");
1143                         return -ENODEV;
1144                 }
1145         }
1146
1147         if (data_interface_num != call_interface_num)
1148                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1149
1150         if (control_interface == data_interface) {
1151                 /* some broken devices designed for windows work this way */
1152                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1153                 combined_interfaces = 1;
1154                 /* a popular other OS doesn't use it */
1155                 quirks |= NO_CAP_LINE;
1156                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1157                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1158                         return -EINVAL;
1159                 }
1160 look_for_collapsed_interface:
1161                 for (i = 0; i < 3; i++) {
1162                         struct usb_endpoint_descriptor *ep;
1163                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1164
1165                         if (usb_endpoint_is_int_in(ep))
1166                                 epctrl = ep;
1167                         else if (usb_endpoint_is_bulk_out(ep))
1168                                 epwrite = ep;
1169                         else if (usb_endpoint_is_bulk_in(ep))
1170                                 epread = ep;
1171                         else
1172                                 return -EINVAL;
1173                 }
1174                 if (!epctrl || !epread || !epwrite)
1175                         return -ENODEV;
1176                 else
1177                         goto made_compressed_probe;
1178         }
1179
1180 skip_normal_probe:
1181
1182         /*workaround for switched interfaces */
1183         if (data_interface->cur_altsetting->desc.bInterfaceClass
1184                                                 != CDC_DATA_INTERFACE_TYPE) {
1185                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1186                                                 == CDC_DATA_INTERFACE_TYPE) {
1187                         struct usb_interface *t;
1188                         dev_dbg(&intf->dev,
1189                                 "Your device has switched interfaces.\n");
1190                         t = control_interface;
1191                         control_interface = data_interface;
1192                         data_interface = t;
1193                 } else {
1194                         return -EINVAL;
1195                 }
1196         }
1197
1198         /* Accept probe requests only for the control interface */
1199         if (!combined_interfaces && intf != control_interface)
1200                 return -ENODEV;
1201
1202         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1203                 /* valid in this context */
1204                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1205                 return -EBUSY;
1206         }
1207
1208
1209         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1210             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1211                 return -EINVAL;
1212
1213         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1214         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1215         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1216
1217
1218         /* workaround for switched endpoints */
1219         if (!usb_endpoint_dir_in(epread)) {
1220                 /* descriptors are swapped */
1221                 struct usb_endpoint_descriptor *t;
1222                 dev_dbg(&intf->dev,
1223                         "The data interface has switched endpoints\n");
1224                 t = epread;
1225                 epread = epwrite;
1226                 epwrite = t;
1227         }
1228 made_compressed_probe:
1229         dev_dbg(&intf->dev, "interfaces are valid\n");
1230
1231         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1232         if (acm == NULL) {
1233                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1234                 goto alloc_fail;
1235         }
1236
1237         minor = acm_alloc_minor(acm);
1238         if (minor == ACM_TTY_MINORS) {
1239                 dev_err(&intf->dev, "no more free acm devices\n");
1240                 kfree(acm);
1241                 return -ENODEV;
1242         }
1243
1244         ctrlsize = usb_endpoint_maxp(epctrl);
1245         readsize = usb_endpoint_maxp(epread) *
1246                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1247         acm->combined_interfaces = combined_interfaces;
1248         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1249         acm->control = control_interface;
1250         acm->data = data_interface;
1251         acm->minor = minor;
1252         acm->dev = usb_dev;
1253         acm->ctrl_caps = ac_management_function;
1254         if (quirks & NO_CAP_LINE)
1255                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1256         acm->ctrlsize = ctrlsize;
1257         acm->readsize = readsize;
1258         acm->rx_buflimit = num_rx_buf;
1259         INIT_WORK(&acm->work, acm_softint);
1260         init_waitqueue_head(&acm->wioctl);
1261         spin_lock_init(&acm->write_lock);
1262         spin_lock_init(&acm->read_lock);
1263         mutex_init(&acm->mutex);
1264         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1265         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1266         if (acm->is_int_ep)
1267                 acm->bInterval = epread->bInterval;
1268         tty_port_init(&acm->port);
1269         acm->port.ops = &acm_port_ops;
1270
1271         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1272         if (!buf) {
1273                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1274                 goto alloc_fail2;
1275         }
1276         acm->ctrl_buffer = buf;
1277
1278         if (acm_write_buffers_alloc(acm) < 0) {
1279                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1280                 goto alloc_fail4;
1281         }
1282
1283         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1284         if (!acm->ctrlurb) {
1285                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1286                 goto alloc_fail5;
1287         }
1288         for (i = 0; i < num_rx_buf; i++) {
1289                 struct acm_rb *rb = &(acm->read_buffers[i]);
1290                 struct urb *urb;
1291
1292                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1293                                                                 &rb->dma);
1294                 if (!rb->base) {
1295                         dev_err(&intf->dev, "out of memory "
1296                                         "(read bufs usb_alloc_coherent)\n");
1297                         goto alloc_fail6;
1298                 }
1299                 rb->index = i;
1300                 rb->instance = acm;
1301
1302                 urb = usb_alloc_urb(0, GFP_KERNEL);
1303                 if (!urb) {
1304                         dev_err(&intf->dev,
1305                                 "out of memory (read urbs usb_alloc_urb)\n");
1306                         goto alloc_fail6;
1307                 }
1308                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1309                 urb->transfer_dma = rb->dma;
1310                 if (acm->is_int_ep) {
1311                         usb_fill_int_urb(urb, acm->dev,
1312                                          acm->rx_endpoint,
1313                                          rb->base,
1314                                          acm->readsize,
1315                                          acm_read_bulk_callback, rb,
1316                                          acm->bInterval);
1317                 } else {
1318                         usb_fill_bulk_urb(urb, acm->dev,
1319                                           acm->rx_endpoint,
1320                                           rb->base,
1321                                           acm->readsize,
1322                                           acm_read_bulk_callback, rb);
1323                 }
1324
1325                 acm->read_urbs[i] = urb;
1326                 __set_bit(i, &acm->read_urbs_free);
1327         }
1328         for (i = 0; i < ACM_NW; i++) {
1329                 struct acm_wb *snd = &(acm->wb[i]);
1330
1331                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1332                 if (snd->urb == NULL) {
1333                         dev_err(&intf->dev,
1334                                 "out of memory (write urbs usb_alloc_urb)\n");
1335                         goto alloc_fail7;
1336                 }
1337
1338                 if (usb_endpoint_xfer_int(epwrite))
1339                         usb_fill_int_urb(snd->urb, usb_dev,
1340                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1341                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1342                 else
1343                         usb_fill_bulk_urb(snd->urb, usb_dev,
1344                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1345                                 NULL, acm->writesize, acm_write_bulk, snd);
1346                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1347                 snd->instance = acm;
1348         }
1349
1350         usb_set_intfdata(intf, acm);
1351
1352         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1353         if (i < 0)
1354                 goto alloc_fail7;
1355
1356         if (cfd) { /* export the country data */
1357                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1358                 if (!acm->country_codes)
1359                         goto skip_countries;
1360                 acm->country_code_size = cfd->bLength - 4;
1361                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1362                                                         cfd->bLength - 4);
1363                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1364
1365                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1366                 if (i < 0) {
1367                         kfree(acm->country_codes);
1368                         acm->country_codes = NULL;
1369                         acm->country_code_size = 0;
1370                         goto skip_countries;
1371                 }
1372
1373                 i = device_create_file(&intf->dev,
1374                                                 &dev_attr_iCountryCodeRelDate);
1375                 if (i < 0) {
1376                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1377                         kfree(acm->country_codes);
1378                         acm->country_codes = NULL;
1379                         acm->country_code_size = 0;
1380                         goto skip_countries;
1381                 }
1382         }
1383
1384 skip_countries:
1385         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1386                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1387                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1388                          /* works around buggy devices */
1389                          epctrl->bInterval ? epctrl->bInterval : 16);
1390         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1391         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1392
1393         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1394
1395         acm_set_control(acm, acm->ctrlout);
1396
1397         acm->line.dwDTERate = cpu_to_le32(9600);
1398         acm->line.bDataBits = 8;
1399         acm_set_line(acm, &acm->line);
1400
1401         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1402         usb_set_intfdata(data_interface, acm);
1403
1404         usb_get_intf(control_interface);
1405         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1406                         &control_interface->dev);
1407         if (IS_ERR(tty_dev)) {
1408                 rv = PTR_ERR(tty_dev);
1409                 goto alloc_fail8;
1410         }
1411
1412         return 0;
1413 alloc_fail8:
1414         if (acm->country_codes) {
1415                 device_remove_file(&acm->control->dev,
1416                                 &dev_attr_wCountryCodes);
1417                 device_remove_file(&acm->control->dev,
1418                                 &dev_attr_iCountryCodeRelDate);
1419         }
1420         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1421 alloc_fail7:
1422         usb_set_intfdata(intf, NULL);
1423         for (i = 0; i < ACM_NW; i++)
1424                 usb_free_urb(acm->wb[i].urb);
1425 alloc_fail6:
1426         for (i = 0; i < num_rx_buf; i++)
1427                 usb_free_urb(acm->read_urbs[i]);
1428         acm_read_buffers_free(acm);
1429         usb_free_urb(acm->ctrlurb);
1430 alloc_fail5:
1431         acm_write_buffers_free(acm);
1432 alloc_fail4:
1433         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1434 alloc_fail2:
1435         acm_release_minor(acm);
1436         kfree(acm);
1437 alloc_fail:
1438         return rv;
1439 }
1440
1441 static void stop_data_traffic(struct acm *acm)
1442 {
1443         int i;
1444
1445         dev_dbg(&acm->control->dev, "%s\n", __func__);
1446
1447         usb_kill_urb(acm->ctrlurb);
1448         for (i = 0; i < ACM_NW; i++)
1449                 usb_kill_urb(acm->wb[i].urb);
1450         for (i = 0; i < acm->rx_buflimit; i++)
1451                 usb_kill_urb(acm->read_urbs[i]);
1452
1453         cancel_work_sync(&acm->work);
1454 }
1455
1456 static void acm_disconnect(struct usb_interface *intf)
1457 {
1458         struct acm *acm = usb_get_intfdata(intf);
1459         struct usb_device *usb_dev = interface_to_usbdev(intf);
1460         struct tty_struct *tty;
1461         int i;
1462
1463         dev_dbg(&intf->dev, "%s\n", __func__);
1464
1465         /* sibling interface is already cleaning up */
1466         if (!acm)
1467                 return;
1468
1469         mutex_lock(&acm->mutex);
1470         acm->disconnected = true;
1471         if (acm->country_codes) {
1472                 device_remove_file(&acm->control->dev,
1473                                 &dev_attr_wCountryCodes);
1474                 device_remove_file(&acm->control->dev,
1475                                 &dev_attr_iCountryCodeRelDate);
1476         }
1477         wake_up_all(&acm->wioctl);
1478         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1479         usb_set_intfdata(acm->control, NULL);
1480         usb_set_intfdata(acm->data, NULL);
1481         mutex_unlock(&acm->mutex);
1482
1483         tty = tty_port_tty_get(&acm->port);
1484         if (tty) {
1485                 tty_vhangup(tty);
1486                 tty_kref_put(tty);
1487         }
1488
1489         stop_data_traffic(acm);
1490
1491         tty_unregister_device(acm_tty_driver, acm->minor);
1492
1493         usb_free_urb(acm->ctrlurb);
1494         for (i = 0; i < ACM_NW; i++)
1495                 usb_free_urb(acm->wb[i].urb);
1496         for (i = 0; i < acm->rx_buflimit; i++)
1497                 usb_free_urb(acm->read_urbs[i]);
1498         acm_write_buffers_free(acm);
1499         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1500         acm_read_buffers_free(acm);
1501
1502         if (!acm->combined_interfaces)
1503                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1504                                         acm->data : acm->control);
1505
1506         tty_port_put(&acm->port);
1507 }
1508
1509 #ifdef CONFIG_PM
1510 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1511 {
1512         struct acm *acm = usb_get_intfdata(intf);
1513         int cnt;
1514
1515         if (PMSG_IS_AUTO(message)) {
1516                 int b;
1517
1518                 spin_lock_irq(&acm->write_lock);
1519                 b = acm->transmitting;
1520                 spin_unlock_irq(&acm->write_lock);
1521                 if (b)
1522                         return -EBUSY;
1523         }
1524
1525         spin_lock_irq(&acm->read_lock);
1526         spin_lock(&acm->write_lock);
1527         cnt = acm->susp_count++;
1528         spin_unlock(&acm->write_lock);
1529         spin_unlock_irq(&acm->read_lock);
1530
1531         if (cnt)
1532                 return 0;
1533
1534         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1535                 stop_data_traffic(acm);
1536
1537         return 0;
1538 }
1539
1540 static int acm_resume(struct usb_interface *intf)
1541 {
1542         struct acm *acm = usb_get_intfdata(intf);
1543         struct acm_wb *wb;
1544         int rv = 0;
1545         int cnt;
1546
1547         spin_lock_irq(&acm->read_lock);
1548         acm->susp_count -= 1;
1549         cnt = acm->susp_count;
1550         spin_unlock_irq(&acm->read_lock);
1551
1552         if (cnt)
1553                 return 0;
1554
1555         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1556                 rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1557
1558                 spin_lock_irq(&acm->write_lock);
1559                 if (acm->delayed_wb) {
1560                         wb = acm->delayed_wb;
1561                         acm->delayed_wb = NULL;
1562                         spin_unlock_irq(&acm->write_lock);
1563                         acm_start_wb(acm, wb);
1564                 } else {
1565                         spin_unlock_irq(&acm->write_lock);
1566                 }
1567
1568                 /*
1569                  * delayed error checking because we must
1570                  * do the write path at all cost
1571                  */
1572                 if (rv < 0)
1573                         goto err_out;
1574
1575                 rv = acm_submit_read_urbs(acm, GFP_NOIO);
1576         }
1577
1578 err_out:
1579         return rv;
1580 }
1581
1582 static int acm_reset_resume(struct usb_interface *intf)
1583 {
1584         struct acm *acm = usb_get_intfdata(intf);
1585
1586         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1587                 tty_port_tty_hangup(&acm->port, false);
1588
1589         return acm_resume(intf);
1590 }
1591
1592 #endif /* CONFIG_PM */
1593
1594 #define NOKIA_PCSUITE_ACM_INFO(x) \
1595                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1596                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1597                 USB_CDC_ACM_PROTO_VENDOR)
1598
1599 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1600                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1601                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1602                 USB_CDC_ACM_PROTO_VENDOR)
1603
1604 /*
1605  * USB driver structure.
1606  */
1607
1608 static const struct usb_device_id acm_ids[] = {
1609         /* quirky and broken devices */
1610         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1611         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1612         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1613         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1614         },
1615         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1616         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1617         },
1618         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1619         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1620         },
1621         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1622         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1623         },
1624         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1625         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1626         },
1627         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1628         .driver_info = SINGLE_RX_URB,
1629         },
1630         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1631         .driver_info = SINGLE_RX_URB, /* firmware bug */
1632         },
1633         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1634         .driver_info = SINGLE_RX_URB, /* firmware bug */
1635         },
1636         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1637         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1638         },
1639         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1640         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1641         },
1642         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1643         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1644         },
1645         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1646         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1647         },
1648         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1649         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1650         },
1651         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1652         },
1653         /* Motorola H24 HSPA module: */
1654         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1655         { USB_DEVICE(0x22b8, 0x2d92) }, /* modem           + diagnostics        */
1656         { USB_DEVICE(0x22b8, 0x2d93) }, /* modem + AT port                      */
1657         { USB_DEVICE(0x22b8, 0x2d95) }, /* modem + AT port + diagnostics        */
1658         { USB_DEVICE(0x22b8, 0x2d96) }, /* modem                         + NMEA */
1659         { USB_DEVICE(0x22b8, 0x2d97) }, /* modem           + diagnostics + NMEA */
1660         { USB_DEVICE(0x22b8, 0x2d99) }, /* modem + AT port               + NMEA */
1661         { USB_DEVICE(0x22b8, 0x2d9a) }, /* modem + AT port + diagnostics + NMEA */
1662
1663         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1664         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1665                                            data interface instead of
1666                                            communications interface.
1667                                            Maybe we should define a new
1668                                            quirk for this. */
1669         },
1670         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1671         .driver_info = NO_UNION_NORMAL,
1672         },
1673         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1674         .driver_info = NO_UNION_NORMAL,
1675         },
1676         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1677         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1678         },
1679         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1680         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1681         },
1682
1683         /* Nokia S60 phones expose two ACM channels. The first is
1684          * a modem and is picked up by the standard AT-command
1685          * information below. The second is 'vendor-specific' but
1686          * is treated as a serial device at the S60 end, so we want
1687          * to expose it on Linux too. */
1688         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1689         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1690         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1691         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1692         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1693         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1694         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1695         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1696         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1697         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1698         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1699         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1700         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1701         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1702         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1703         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1704         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1705         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1706         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1707         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1708         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1709         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1710         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1711         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1712         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1713         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1714         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1715         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1716         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1717         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1718         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1719         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1720         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1721         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1722         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1723         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1724         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1725         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1726         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1727         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1728         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1729         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1730         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1731         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1732         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1733         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1734         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1735         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1736         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1737         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1738         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1739         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1740         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1741         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1742         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1743         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1744         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1745         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1746
1747         /* Support for Owen devices */
1748         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1749
1750         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1751
1752         /* Support Lego NXT using pbLua firmware */
1753         { USB_DEVICE(0x0694, 0xff00),
1754         .driver_info = NOT_A_MODEM,
1755         },
1756
1757         /* Support for Droids MuIn LCD */
1758         { USB_DEVICE(0x04d8, 0x000b),
1759         .driver_info = NO_DATA_INTERFACE,
1760         },
1761
1762 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1763         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1764         .driver_info = IGNORE_DEVICE,
1765         },
1766         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1767         .driver_info = IGNORE_DEVICE,
1768         },
1769 #endif
1770
1771         /* control interfaces without any protocol set */
1772         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1773                 USB_CDC_PROTO_NONE) },
1774
1775         /* control interfaces with various AT-command sets */
1776         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1777                 USB_CDC_ACM_PROTO_AT_V25TER) },
1778         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1779                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1780         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1781                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1782         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1783                 USB_CDC_ACM_PROTO_AT_GSM) },
1784         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1785                 USB_CDC_ACM_PROTO_AT_3G) },
1786         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1787                 USB_CDC_ACM_PROTO_AT_CDMA) },
1788
1789         { }
1790 };
1791
1792 MODULE_DEVICE_TABLE(usb, acm_ids);
1793
1794 static struct usb_driver acm_driver = {
1795         .name =         "cdc_acm",
1796         .probe =        acm_probe,
1797         .disconnect =   acm_disconnect,
1798 #ifdef CONFIG_PM
1799         .suspend =      acm_suspend,
1800         .resume =       acm_resume,
1801         .reset_resume = acm_reset_resume,
1802 #endif
1803         .id_table =     acm_ids,
1804 #ifdef CONFIG_PM
1805         .supports_autosuspend = 1,
1806 #endif
1807         .disable_hub_initiated_lpm = 1,
1808 };
1809
1810 /*
1811  * TTY driver structures.
1812  */
1813
1814 static const struct tty_operations acm_ops = {
1815         .install =              acm_tty_install,
1816         .open =                 acm_tty_open,
1817         .close =                acm_tty_close,
1818         .cleanup =              acm_tty_cleanup,
1819         .hangup =               acm_tty_hangup,
1820         .write =                acm_tty_write,
1821         .write_room =           acm_tty_write_room,
1822         .ioctl =                acm_tty_ioctl,
1823         .throttle =             acm_tty_throttle,
1824         .unthrottle =           acm_tty_unthrottle,
1825         .chars_in_buffer =      acm_tty_chars_in_buffer,
1826         .break_ctl =            acm_tty_break_ctl,
1827         .set_termios =          acm_tty_set_termios,
1828         .tiocmget =             acm_tty_tiocmget,
1829         .tiocmset =             acm_tty_tiocmset,
1830 };
1831
1832 /*
1833  * Init / exit.
1834  */
1835
1836 static int __init acm_init(void)
1837 {
1838         int retval;
1839         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1840         if (!acm_tty_driver)
1841                 return -ENOMEM;
1842         acm_tty_driver->driver_name = "acm",
1843         acm_tty_driver->name = "ttyACM",
1844         acm_tty_driver->major = ACM_TTY_MAJOR,
1845         acm_tty_driver->minor_start = 0,
1846         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1847         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1848         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1849         acm_tty_driver->init_termios = tty_std_termios;
1850         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1851                                                                 HUPCL | CLOCAL;
1852         tty_set_operations(acm_tty_driver, &acm_ops);
1853
1854         retval = tty_register_driver(acm_tty_driver);
1855         if (retval) {
1856                 put_tty_driver(acm_tty_driver);
1857                 return retval;
1858         }
1859
1860         retval = usb_register(&acm_driver);
1861         if (retval) {
1862                 tty_unregister_driver(acm_tty_driver);
1863                 put_tty_driver(acm_tty_driver);
1864                 return retval;
1865         }
1866
1867         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1868
1869         return 0;
1870 }
1871
1872 static void __exit acm_exit(void)
1873 {
1874         usb_deregister(&acm_driver);
1875         tty_unregister_driver(acm_tty_driver);
1876         put_tty_driver(acm_tty_driver);
1877 }
1878
1879 module_init(acm_init);
1880 module_exit(acm_exit);
1881
1882 MODULE_AUTHOR(DRIVER_AUTHOR);
1883 MODULE_DESCRIPTION(DRIVER_DESC);
1884 MODULE_LICENSE("GPL");
1885 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);