Merge 3.9-rc5 into tty-next
[linux-3.10.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 static int acm_write_start(struct acm *acm, int wbn)
220 {
221         unsigned long flags;
222         struct acm_wb *wb = &acm->wb[wbn];
223         int rc;
224
225         spin_lock_irqsave(&acm->write_lock, flags);
226         if (!acm->dev) {
227                 wb->use = 0;
228                 spin_unlock_irqrestore(&acm->write_lock, flags);
229                 return -ENODEV;
230         }
231
232         dev_vdbg(&acm->data->dev, "%s - susp_count %d\n", __func__,
233                                                         acm->susp_count);
234         usb_autopm_get_interface_async(acm->control);
235         if (acm->susp_count) {
236                 if (!acm->delayed_wb)
237                         acm->delayed_wb = wb;
238                 else
239                         usb_autopm_put_interface_async(acm->control);
240                 spin_unlock_irqrestore(&acm->write_lock, flags);
241                 return 0;       /* A white lie */
242         }
243         usb_mark_last_busy(acm->dev);
244
245         rc = acm_start_wb(acm, wb);
246         spin_unlock_irqrestore(&acm->write_lock, flags);
247
248         return rc;
249
250 }
251 /*
252  * attributes exported through sysfs
253  */
254 static ssize_t show_caps
255 (struct device *dev, struct device_attribute *attr, char *buf)
256 {
257         struct usb_interface *intf = to_usb_interface(dev);
258         struct acm *acm = usb_get_intfdata(intf);
259
260         return sprintf(buf, "%d", acm->ctrl_caps);
261 }
262 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
263
264 static ssize_t show_country_codes
265 (struct device *dev, struct device_attribute *attr, char *buf)
266 {
267         struct usb_interface *intf = to_usb_interface(dev);
268         struct acm *acm = usb_get_intfdata(intf);
269
270         memcpy(buf, acm->country_codes, acm->country_code_size);
271         return acm->country_code_size;
272 }
273
274 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
275
276 static ssize_t show_country_rel_date
277 (struct device *dev, struct device_attribute *attr, char *buf)
278 {
279         struct usb_interface *intf = to_usb_interface(dev);
280         struct acm *acm = usb_get_intfdata(intf);
281
282         return sprintf(buf, "%d", acm->country_rel_date);
283 }
284
285 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
286 /*
287  * Interrupt handlers for various ACM device responses
288  */
289
290 /* control interface reports status changes with "interrupt" transfers */
291 static void acm_ctrl_irq(struct urb *urb)
292 {
293         struct acm *acm = urb->context;
294         struct usb_cdc_notification *dr = urb->transfer_buffer;
295         unsigned char *data;
296         int newctrl;
297         int retval;
298         int status = urb->status;
299
300         switch (status) {
301         case 0:
302                 /* success */
303                 break;
304         case -ECONNRESET:
305         case -ENOENT:
306         case -ESHUTDOWN:
307                 /* this urb is terminated, clean up */
308                 dev_dbg(&acm->control->dev,
309                                 "%s - urb shutting down with status: %d\n",
310                                 __func__, status);
311                 return;
312         default:
313                 dev_dbg(&acm->control->dev,
314                                 "%s - nonzero urb status received: %d\n",
315                                 __func__, status);
316                 goto exit;
317         }
318
319         usb_mark_last_busy(acm->dev);
320
321         data = (unsigned char *)(dr + 1);
322         switch (dr->bNotificationType) {
323         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
324                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
325                                                         __func__, dr->wValue);
326                 break;
327
328         case USB_CDC_NOTIFY_SERIAL_STATE:
329                 newctrl = get_unaligned_le16(data);
330
331                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
332                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
333                                         __func__);
334                         tty_port_tty_hangup(&acm->port, false);
335                 }
336
337                 acm->ctrlin = newctrl;
338
339                 dev_dbg(&acm->control->dev,
340                         "%s - input control lines: dcd%c dsr%c break%c "
341                         "ring%c framing%c parity%c overrun%c\n",
342                         __func__,
343                         acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
344                         acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
345                         acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
346                         acm->ctrlin & ACM_CTRL_RI  ? '+' : '-',
347                         acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
348                         acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
349                         acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
350                         break;
351
352         default:
353                 dev_dbg(&acm->control->dev,
354                         "%s - unknown notification %d received: index %d "
355                         "len %d data0 %d data1 %d\n",
356                         __func__,
357                         dr->bNotificationType, dr->wIndex,
358                         dr->wLength, data[0], data[1]);
359                 break;
360         }
361 exit:
362         retval = usb_submit_urb(urb, GFP_ATOMIC);
363         if (retval)
364                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
365                                                         __func__, retval);
366 }
367
368 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
369 {
370         int res;
371
372         if (!test_and_clear_bit(index, &acm->read_urbs_free))
373                 return 0;
374
375         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
376
377         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
378         if (res) {
379                 if (res != -EPERM) {
380                         dev_err(&acm->data->dev,
381                                         "%s - usb_submit_urb failed: %d\n",
382                                         __func__, res);
383                 }
384                 set_bit(index, &acm->read_urbs_free);
385                 return res;
386         }
387
388         return 0;
389 }
390
391 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
392 {
393         int res;
394         int i;
395
396         for (i = 0; i < acm->rx_buflimit; ++i) {
397                 res = acm_submit_read_urb(acm, i, mem_flags);
398                 if (res)
399                         return res;
400         }
401
402         return 0;
403 }
404
405 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
406 {
407         if (!urb->actual_length)
408                 return;
409
410         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
411                         urb->actual_length);
412         tty_flip_buffer_push(&acm->port);
413 }
414
415 static void acm_read_bulk_callback(struct urb *urb)
416 {
417         struct acm_rb *rb = urb->context;
418         struct acm *acm = rb->instance;
419         unsigned long flags;
420
421         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
422                                         rb->index, urb->actual_length);
423         set_bit(rb->index, &acm->read_urbs_free);
424
425         if (!acm->dev) {
426                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
427                 return;
428         }
429         usb_mark_last_busy(acm->dev);
430
431         if (urb->status) {
432                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
433                                                         __func__, urb->status);
434                 return;
435         }
436         acm_process_read_urb(acm, urb);
437
438         /* throttle device if requested by tty */
439         spin_lock_irqsave(&acm->read_lock, flags);
440         acm->throttled = acm->throttle_req;
441         if (!acm->throttled && !acm->susp_count) {
442                 spin_unlock_irqrestore(&acm->read_lock, flags);
443                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
444         } else {
445                 spin_unlock_irqrestore(&acm->read_lock, flags);
446         }
447 }
448
449 /* data interface wrote those outgoing bytes */
450 static void acm_write_bulk(struct urb *urb)
451 {
452         struct acm_wb *wb = urb->context;
453         struct acm *acm = wb->instance;
454         unsigned long flags;
455
456         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
457                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
458                         __func__,
459                         urb->actual_length,
460                         urb->transfer_buffer_length,
461                         urb->status);
462
463         spin_lock_irqsave(&acm->write_lock, flags);
464         acm_write_done(acm, wb);
465         spin_unlock_irqrestore(&acm->write_lock, flags);
466         schedule_work(&acm->work);
467 }
468
469 static void acm_softint(struct work_struct *work)
470 {
471         struct acm *acm = container_of(work, struct acm, work);
472
473         dev_vdbg(&acm->data->dev, "%s\n", __func__);
474
475         tty_port_tty_wakeup(&acm->port);
476 }
477
478 /*
479  * TTY handlers
480  */
481
482 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
483 {
484         struct acm *acm;
485         int retval;
486
487         dev_dbg(tty->dev, "%s\n", __func__);
488
489         acm = acm_get_by_index(tty->index);
490         if (!acm)
491                 return -ENODEV;
492
493         retval = tty_standard_install(driver, tty);
494         if (retval)
495                 goto error_init_termios;
496
497         tty->driver_data = acm;
498
499         return 0;
500
501 error_init_termios:
502         tty_port_put(&acm->port);
503         return retval;
504 }
505
506 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
507 {
508         struct acm *acm = tty->driver_data;
509
510         dev_dbg(tty->dev, "%s\n", __func__);
511
512         return tty_port_open(&acm->port, tty, filp);
513 }
514
515 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
516 {
517         struct acm *acm = container_of(port, struct acm, port);
518         int retval = -ENODEV;
519
520         dev_dbg(&acm->control->dev, "%s\n", __func__);
521
522         mutex_lock(&acm->mutex);
523         if (acm->disconnected)
524                 goto disconnected;
525
526         retval = usb_autopm_get_interface(acm->control);
527         if (retval)
528                 goto error_get_interface;
529
530         /*
531          * FIXME: Why do we need this? Allocating 64K of physically contiguous
532          * memory is really nasty...
533          */
534         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
535         acm->control->needs_remote_wakeup = 1;
536
537         acm->ctrlurb->dev = acm->dev;
538         if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
539                 dev_err(&acm->control->dev,
540                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
541                 goto error_submit_urb;
542         }
543
544         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
545         if (acm_set_control(acm, acm->ctrlout) < 0 &&
546             (acm->ctrl_caps & USB_CDC_CAP_LINE))
547                 goto error_set_control;
548
549         usb_autopm_put_interface(acm->control);
550
551         /*
552          * Unthrottle device in case the TTY was closed while throttled.
553          */
554         spin_lock_irq(&acm->read_lock);
555         acm->throttled = 0;
556         acm->throttle_req = 0;
557         spin_unlock_irq(&acm->read_lock);
558
559         if (acm_submit_read_urbs(acm, GFP_KERNEL))
560                 goto error_submit_read_urbs;
561
562         mutex_unlock(&acm->mutex);
563
564         return 0;
565
566 error_submit_read_urbs:
567         acm->ctrlout = 0;
568         acm_set_control(acm, acm->ctrlout);
569 error_set_control:
570         usb_kill_urb(acm->ctrlurb);
571 error_submit_urb:
572         usb_autopm_put_interface(acm->control);
573 error_get_interface:
574 disconnected:
575         mutex_unlock(&acm->mutex);
576         return retval;
577 }
578
579 static void acm_port_destruct(struct tty_port *port)
580 {
581         struct acm *acm = container_of(port, struct acm, port);
582
583         dev_dbg(&acm->control->dev, "%s\n", __func__);
584
585         acm_release_minor(acm);
586         usb_put_intf(acm->control);
587         kfree(acm->country_codes);
588         kfree(acm);
589 }
590
591 static void acm_port_shutdown(struct tty_port *port)
592 {
593         struct acm *acm = container_of(port, struct acm, port);
594         int i;
595
596         dev_dbg(&acm->control->dev, "%s\n", __func__);
597
598         mutex_lock(&acm->mutex);
599         if (!acm->disconnected) {
600                 usb_autopm_get_interface(acm->control);
601                 acm_set_control(acm, acm->ctrlout = 0);
602                 usb_kill_urb(acm->ctrlurb);
603                 for (i = 0; i < ACM_NW; i++)
604                         usb_kill_urb(acm->wb[i].urb);
605                 for (i = 0; i < acm->rx_buflimit; i++)
606                         usb_kill_urb(acm->read_urbs[i]);
607                 acm->control->needs_remote_wakeup = 0;
608                 usb_autopm_put_interface(acm->control);
609         }
610         mutex_unlock(&acm->mutex);
611 }
612
613 static void acm_tty_cleanup(struct tty_struct *tty)
614 {
615         struct acm *acm = tty->driver_data;
616         dev_dbg(&acm->control->dev, "%s\n", __func__);
617         tty_port_put(&acm->port);
618 }
619
620 static void acm_tty_hangup(struct tty_struct *tty)
621 {
622         struct acm *acm = tty->driver_data;
623         dev_dbg(&acm->control->dev, "%s\n", __func__);
624         tty_port_hangup(&acm->port);
625 }
626
627 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
628 {
629         struct acm *acm = tty->driver_data;
630         dev_dbg(&acm->control->dev, "%s\n", __func__);
631         tty_port_close(&acm->port, tty, filp);
632 }
633
634 static int acm_tty_write(struct tty_struct *tty,
635                                         const unsigned char *buf, int count)
636 {
637         struct acm *acm = tty->driver_data;
638         int stat;
639         unsigned long flags;
640         int wbn;
641         struct acm_wb *wb;
642
643         if (!count)
644                 return 0;
645
646         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
647
648         spin_lock_irqsave(&acm->write_lock, flags);
649         wbn = acm_wb_alloc(acm);
650         if (wbn < 0) {
651                 spin_unlock_irqrestore(&acm->write_lock, flags);
652                 return 0;
653         }
654         wb = &acm->wb[wbn];
655
656         count = (count > acm->writesize) ? acm->writesize : count;
657         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
658         memcpy(wb->buf, buf, count);
659         wb->len = count;
660         spin_unlock_irqrestore(&acm->write_lock, flags);
661
662         stat = acm_write_start(acm, wbn);
663         if (stat < 0)
664                 return stat;
665         return count;
666 }
667
668 static int acm_tty_write_room(struct tty_struct *tty)
669 {
670         struct acm *acm = tty->driver_data;
671         /*
672          * Do not let the line discipline to know that we have a reserve,
673          * or it might get too enthusiastic.
674          */
675         return acm_wb_is_avail(acm) ? acm->writesize : 0;
676 }
677
678 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
679 {
680         struct acm *acm = tty->driver_data;
681         /*
682          * if the device was unplugged then any remaining characters fell out
683          * of the connector ;)
684          */
685         if (acm->disconnected)
686                 return 0;
687         /*
688          * This is inaccurate (overcounts), but it works.
689          */
690         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
691 }
692
693 static void acm_tty_throttle(struct tty_struct *tty)
694 {
695         struct acm *acm = tty->driver_data;
696
697         spin_lock_irq(&acm->read_lock);
698         acm->throttle_req = 1;
699         spin_unlock_irq(&acm->read_lock);
700 }
701
702 static void acm_tty_unthrottle(struct tty_struct *tty)
703 {
704         struct acm *acm = tty->driver_data;
705         unsigned int was_throttled;
706
707         spin_lock_irq(&acm->read_lock);
708         was_throttled = acm->throttled;
709         acm->throttled = 0;
710         acm->throttle_req = 0;
711         spin_unlock_irq(&acm->read_lock);
712
713         if (was_throttled)
714                 acm_submit_read_urbs(acm, GFP_KERNEL);
715 }
716
717 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
718 {
719         struct acm *acm = tty->driver_data;
720         int retval;
721
722         retval = acm_send_break(acm, state ? 0xffff : 0);
723         if (retval < 0)
724                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
725                                                                 __func__);
726         return retval;
727 }
728
729 static int acm_tty_tiocmget(struct tty_struct *tty)
730 {
731         struct acm *acm = tty->driver_data;
732
733         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
734                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
735                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
736                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
737                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
738                TIOCM_CTS;
739 }
740
741 static int acm_tty_tiocmset(struct tty_struct *tty,
742                             unsigned int set, unsigned int clear)
743 {
744         struct acm *acm = tty->driver_data;
745         unsigned int newctrl;
746
747         newctrl = acm->ctrlout;
748         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
749                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
750         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
751                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
752
753         newctrl = (newctrl & ~clear) | set;
754
755         if (acm->ctrlout == newctrl)
756                 return 0;
757         return acm_set_control(acm, acm->ctrlout = newctrl);
758 }
759
760 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
761 {
762         struct serial_struct tmp;
763
764         if (!info)
765                 return -EINVAL;
766
767         memset(&tmp, 0, sizeof(tmp));
768         tmp.flags = ASYNC_LOW_LATENCY;
769         tmp.xmit_fifo_size = acm->writesize;
770         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
771         tmp.close_delay = acm->port.close_delay / 10;
772         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
773                                 ASYNC_CLOSING_WAIT_NONE :
774                                 acm->port.closing_wait / 10;
775
776         if (copy_to_user(info, &tmp, sizeof(tmp)))
777                 return -EFAULT;
778         else
779                 return 0;
780 }
781
782 static int set_serial_info(struct acm *acm,
783                                 struct serial_struct __user *newinfo)
784 {
785         struct serial_struct new_serial;
786         unsigned int closing_wait, close_delay;
787         int retval = 0;
788
789         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
790                 return -EFAULT;
791
792         close_delay = new_serial.close_delay * 10;
793         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
794                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
795
796         mutex_lock(&acm->port.mutex);
797
798         if (!capable(CAP_SYS_ADMIN)) {
799                 if ((close_delay != acm->port.close_delay) ||
800                     (closing_wait != acm->port.closing_wait))
801                         retval = -EPERM;
802                 else
803                         retval = -EOPNOTSUPP;
804         } else {
805                 acm->port.close_delay  = close_delay;
806                 acm->port.closing_wait = closing_wait;
807         }
808
809         mutex_unlock(&acm->port.mutex);
810         return retval;
811 }
812
813 static int acm_tty_ioctl(struct tty_struct *tty,
814                                         unsigned int cmd, unsigned long arg)
815 {
816         struct acm *acm = tty->driver_data;
817         int rv = -ENOIOCTLCMD;
818
819         switch (cmd) {
820         case TIOCGSERIAL: /* gets serial port data */
821                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
822                 break;
823         case TIOCSSERIAL:
824                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
825                 break;
826         }
827
828         return rv;
829 }
830
831 static const __u32 acm_tty_speed[] = {
832         0, 50, 75, 110, 134, 150, 200, 300, 600,
833         1200, 1800, 2400, 4800, 9600, 19200, 38400,
834         57600, 115200, 230400, 460800, 500000, 576000,
835         921600, 1000000, 1152000, 1500000, 2000000,
836         2500000, 3000000, 3500000, 4000000
837 };
838
839 static void acm_tty_set_termios(struct tty_struct *tty,
840                                                 struct ktermios *termios_old)
841 {
842         struct acm *acm = tty->driver_data;
843         struct ktermios *termios = &tty->termios;
844         struct usb_cdc_line_coding newline;
845         int newctrl = acm->ctrlout;
846
847         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
848         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
849         newline.bParityType = termios->c_cflag & PARENB ?
850                                 (termios->c_cflag & PARODD ? 1 : 2) +
851                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
852         switch (termios->c_cflag & CSIZE) {
853         case CS5:
854                 newline.bDataBits = 5;
855                 break;
856         case CS6:
857                 newline.bDataBits = 6;
858                 break;
859         case CS7:
860                 newline.bDataBits = 7;
861                 break;
862         case CS8:
863         default:
864                 newline.bDataBits = 8;
865                 break;
866         }
867         /* FIXME: Needs to clear unsupported bits in the termios */
868         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
869
870         if (!newline.dwDTERate) {
871                 newline.dwDTERate = acm->line.dwDTERate;
872                 newctrl &= ~ACM_CTRL_DTR;
873         } else
874                 newctrl |=  ACM_CTRL_DTR;
875
876         if (newctrl != acm->ctrlout)
877                 acm_set_control(acm, acm->ctrlout = newctrl);
878
879         if (memcmp(&acm->line, &newline, sizeof newline)) {
880                 memcpy(&acm->line, &newline, sizeof newline);
881                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
882                         __func__,
883                         le32_to_cpu(newline.dwDTERate),
884                         newline.bCharFormat, newline.bParityType,
885                         newline.bDataBits);
886                 acm_set_line(acm, &acm->line);
887         }
888 }
889
890 static const struct tty_port_operations acm_port_ops = {
891         .shutdown = acm_port_shutdown,
892         .activate = acm_port_activate,
893         .destruct = acm_port_destruct,
894 };
895
896 /*
897  * USB probe and disconnect routines.
898  */
899
900 /* Little helpers: write/read buffers free */
901 static void acm_write_buffers_free(struct acm *acm)
902 {
903         int i;
904         struct acm_wb *wb;
905         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
906
907         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
908                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
909 }
910
911 static void acm_read_buffers_free(struct acm *acm)
912 {
913         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
914         int i;
915
916         for (i = 0; i < acm->rx_buflimit; i++)
917                 usb_free_coherent(usb_dev, acm->readsize,
918                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
919 }
920
921 /* Little helper: write buffers allocate */
922 static int acm_write_buffers_alloc(struct acm *acm)
923 {
924         int i;
925         struct acm_wb *wb;
926
927         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
928                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
929                     &wb->dmah);
930                 if (!wb->buf) {
931                         while (i != 0) {
932                                 --i;
933                                 --wb;
934                                 usb_free_coherent(acm->dev, acm->writesize,
935                                     wb->buf, wb->dmah);
936                         }
937                         return -ENOMEM;
938                 }
939         }
940         return 0;
941 }
942
943 static int acm_probe(struct usb_interface *intf,
944                      const struct usb_device_id *id)
945 {
946         struct usb_cdc_union_desc *union_header = NULL;
947         struct usb_cdc_country_functional_desc *cfd = NULL;
948         unsigned char *buffer = intf->altsetting->extra;
949         int buflen = intf->altsetting->extralen;
950         struct usb_interface *control_interface;
951         struct usb_interface *data_interface;
952         struct usb_endpoint_descriptor *epctrl = NULL;
953         struct usb_endpoint_descriptor *epread = NULL;
954         struct usb_endpoint_descriptor *epwrite = NULL;
955         struct usb_device *usb_dev = interface_to_usbdev(intf);
956         struct acm *acm;
957         int minor;
958         int ctrlsize, readsize;
959         u8 *buf;
960         u8 ac_management_function = 0;
961         u8 call_management_function = 0;
962         int call_interface_num = -1;
963         int data_interface_num = -1;
964         unsigned long quirks;
965         int num_rx_buf;
966         int i;
967         int combined_interfaces = 0;
968         struct device *tty_dev;
969         int rv = -ENOMEM;
970
971         /* normal quirks */
972         quirks = (unsigned long)id->driver_info;
973         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
974
975         /* handle quirks deadly to normal probing*/
976         if (quirks == NO_UNION_NORMAL) {
977                 data_interface = usb_ifnum_to_if(usb_dev, 1);
978                 control_interface = usb_ifnum_to_if(usb_dev, 0);
979                 goto skip_normal_probe;
980         }
981
982         /* normal probing*/
983         if (!buffer) {
984                 dev_err(&intf->dev, "Weird descriptor references\n");
985                 return -EINVAL;
986         }
987
988         if (!buflen) {
989                 if (intf->cur_altsetting->endpoint &&
990                                 intf->cur_altsetting->endpoint->extralen &&
991                                 intf->cur_altsetting->endpoint->extra) {
992                         dev_dbg(&intf->dev,
993                                 "Seeking extra descriptors on endpoint\n");
994                         buflen = intf->cur_altsetting->endpoint->extralen;
995                         buffer = intf->cur_altsetting->endpoint->extra;
996                 } else {
997                         dev_err(&intf->dev,
998                                 "Zero length descriptor references\n");
999                         return -EINVAL;
1000                 }
1001         }
1002
1003         while (buflen > 0) {
1004                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1005                         dev_err(&intf->dev, "skipping garbage\n");
1006                         goto next_desc;
1007                 }
1008
1009                 switch (buffer[2]) {
1010                 case USB_CDC_UNION_TYPE: /* we've found it */
1011                         if (union_header) {
1012                                 dev_err(&intf->dev, "More than one "
1013                                         "union descriptor, skipping ...\n");
1014                                 goto next_desc;
1015                         }
1016                         union_header = (struct usb_cdc_union_desc *)buffer;
1017                         break;
1018                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1019                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1020                         break;
1021                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1022                         break; /* for now we ignore it */
1023                 case USB_CDC_ACM_TYPE:
1024                         ac_management_function = buffer[3];
1025                         break;
1026                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1027                         call_management_function = buffer[3];
1028                         call_interface_num = buffer[4];
1029                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1030                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1031                         break;
1032                 default:
1033                         /* there are LOTS more CDC descriptors that
1034                          * could legitimately be found here.
1035                          */
1036                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1037                                         "type %02x, length %d\n",
1038                                         buffer[2], buffer[0]);
1039                         break;
1040                 }
1041 next_desc:
1042                 buflen -= buffer[0];
1043                 buffer += buffer[0];
1044         }
1045
1046         if (!union_header) {
1047                 if (call_interface_num > 0) {
1048                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1049                         /* quirks for Droids MuIn LCD */
1050                         if (quirks & NO_DATA_INTERFACE)
1051                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1052                         else
1053                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1054                         control_interface = intf;
1055                 } else {
1056                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1057                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1058                                 return -ENODEV;
1059                         } else {
1060                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1061                                 combined_interfaces = 1;
1062                                 control_interface = data_interface = intf;
1063                                 goto look_for_collapsed_interface;
1064                         }
1065                 }
1066         } else {
1067                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1068                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1069                 if (!control_interface || !data_interface) {
1070                         dev_dbg(&intf->dev, "no interfaces\n");
1071                         return -ENODEV;
1072                 }
1073         }
1074
1075         if (data_interface_num != call_interface_num)
1076                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1077
1078         if (control_interface == data_interface) {
1079                 /* some broken devices designed for windows work this way */
1080                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1081                 combined_interfaces = 1;
1082                 /* a popular other OS doesn't use it */
1083                 quirks |= NO_CAP_LINE;
1084                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1085                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1086                         return -EINVAL;
1087                 }
1088 look_for_collapsed_interface:
1089                 for (i = 0; i < 3; i++) {
1090                         struct usb_endpoint_descriptor *ep;
1091                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1092
1093                         if (usb_endpoint_is_int_in(ep))
1094                                 epctrl = ep;
1095                         else if (usb_endpoint_is_bulk_out(ep))
1096                                 epwrite = ep;
1097                         else if (usb_endpoint_is_bulk_in(ep))
1098                                 epread = ep;
1099                         else
1100                                 return -EINVAL;
1101                 }
1102                 if (!epctrl || !epread || !epwrite)
1103                         return -ENODEV;
1104                 else
1105                         goto made_compressed_probe;
1106         }
1107
1108 skip_normal_probe:
1109
1110         /*workaround for switched interfaces */
1111         if (data_interface->cur_altsetting->desc.bInterfaceClass
1112                                                 != CDC_DATA_INTERFACE_TYPE) {
1113                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1114                                                 == CDC_DATA_INTERFACE_TYPE) {
1115                         struct usb_interface *t;
1116                         dev_dbg(&intf->dev,
1117                                 "Your device has switched interfaces.\n");
1118                         t = control_interface;
1119                         control_interface = data_interface;
1120                         data_interface = t;
1121                 } else {
1122                         return -EINVAL;
1123                 }
1124         }
1125
1126         /* Accept probe requests only for the control interface */
1127         if (!combined_interfaces && intf != control_interface)
1128                 return -ENODEV;
1129
1130         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1131                 /* valid in this context */
1132                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1133                 return -EBUSY;
1134         }
1135
1136
1137         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1138             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1139                 return -EINVAL;
1140
1141         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1142         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1143         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1144
1145
1146         /* workaround for switched endpoints */
1147         if (!usb_endpoint_dir_in(epread)) {
1148                 /* descriptors are swapped */
1149                 struct usb_endpoint_descriptor *t;
1150                 dev_dbg(&intf->dev,
1151                         "The data interface has switched endpoints\n");
1152                 t = epread;
1153                 epread = epwrite;
1154                 epwrite = t;
1155         }
1156 made_compressed_probe:
1157         dev_dbg(&intf->dev, "interfaces are valid\n");
1158
1159         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1160         if (acm == NULL) {
1161                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1162                 goto alloc_fail;
1163         }
1164
1165         minor = acm_alloc_minor(acm);
1166         if (minor == ACM_TTY_MINORS) {
1167                 dev_err(&intf->dev, "no more free acm devices\n");
1168                 kfree(acm);
1169                 return -ENODEV;
1170         }
1171
1172         ctrlsize = usb_endpoint_maxp(epctrl);
1173         readsize = usb_endpoint_maxp(epread) *
1174                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1175         acm->combined_interfaces = combined_interfaces;
1176         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1177         acm->control = control_interface;
1178         acm->data = data_interface;
1179         acm->minor = minor;
1180         acm->dev = usb_dev;
1181         acm->ctrl_caps = ac_management_function;
1182         if (quirks & NO_CAP_LINE)
1183                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1184         acm->ctrlsize = ctrlsize;
1185         acm->readsize = readsize;
1186         acm->rx_buflimit = num_rx_buf;
1187         INIT_WORK(&acm->work, acm_softint);
1188         spin_lock_init(&acm->write_lock);
1189         spin_lock_init(&acm->read_lock);
1190         mutex_init(&acm->mutex);
1191         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1192         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1193         if (acm->is_int_ep)
1194                 acm->bInterval = epread->bInterval;
1195         tty_port_init(&acm->port);
1196         acm->port.ops = &acm_port_ops;
1197
1198         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1199         if (!buf) {
1200                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1201                 goto alloc_fail2;
1202         }
1203         acm->ctrl_buffer = buf;
1204
1205         if (acm_write_buffers_alloc(acm) < 0) {
1206                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1207                 goto alloc_fail4;
1208         }
1209
1210         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1211         if (!acm->ctrlurb) {
1212                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1213                 goto alloc_fail5;
1214         }
1215         for (i = 0; i < num_rx_buf; i++) {
1216                 struct acm_rb *rb = &(acm->read_buffers[i]);
1217                 struct urb *urb;
1218
1219                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1220                                                                 &rb->dma);
1221                 if (!rb->base) {
1222                         dev_err(&intf->dev, "out of memory "
1223                                         "(read bufs usb_alloc_coherent)\n");
1224                         goto alloc_fail6;
1225                 }
1226                 rb->index = i;
1227                 rb->instance = acm;
1228
1229                 urb = usb_alloc_urb(0, GFP_KERNEL);
1230                 if (!urb) {
1231                         dev_err(&intf->dev,
1232                                 "out of memory (read urbs usb_alloc_urb)\n");
1233                         goto alloc_fail6;
1234                 }
1235                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1236                 urb->transfer_dma = rb->dma;
1237                 if (acm->is_int_ep) {
1238                         usb_fill_int_urb(urb, acm->dev,
1239                                          acm->rx_endpoint,
1240                                          rb->base,
1241                                          acm->readsize,
1242                                          acm_read_bulk_callback, rb,
1243                                          acm->bInterval);
1244                 } else {
1245                         usb_fill_bulk_urb(urb, acm->dev,
1246                                           acm->rx_endpoint,
1247                                           rb->base,
1248                                           acm->readsize,
1249                                           acm_read_bulk_callback, rb);
1250                 }
1251
1252                 acm->read_urbs[i] = urb;
1253                 __set_bit(i, &acm->read_urbs_free);
1254         }
1255         for (i = 0; i < ACM_NW; i++) {
1256                 struct acm_wb *snd = &(acm->wb[i]);
1257
1258                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1259                 if (snd->urb == NULL) {
1260                         dev_err(&intf->dev,
1261                                 "out of memory (write urbs usb_alloc_urb)\n");
1262                         goto alloc_fail7;
1263                 }
1264
1265                 if (usb_endpoint_xfer_int(epwrite))
1266                         usb_fill_int_urb(snd->urb, usb_dev,
1267                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1268                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1269                 else
1270                         usb_fill_bulk_urb(snd->urb, usb_dev,
1271                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1272                                 NULL, acm->writesize, acm_write_bulk, snd);
1273                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1274                 snd->instance = acm;
1275         }
1276
1277         usb_set_intfdata(intf, acm);
1278
1279         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1280         if (i < 0)
1281                 goto alloc_fail7;
1282
1283         if (cfd) { /* export the country data */
1284                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1285                 if (!acm->country_codes)
1286                         goto skip_countries;
1287                 acm->country_code_size = cfd->bLength - 4;
1288                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1289                                                         cfd->bLength - 4);
1290                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1291
1292                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1293                 if (i < 0) {
1294                         kfree(acm->country_codes);
1295                         acm->country_codes = NULL;
1296                         acm->country_code_size = 0;
1297                         goto skip_countries;
1298                 }
1299
1300                 i = device_create_file(&intf->dev,
1301                                                 &dev_attr_iCountryCodeRelDate);
1302                 if (i < 0) {
1303                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1304                         kfree(acm->country_codes);
1305                         acm->country_codes = NULL;
1306                         acm->country_code_size = 0;
1307                         goto skip_countries;
1308                 }
1309         }
1310
1311 skip_countries:
1312         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1313                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1314                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1315                          /* works around buggy devices */
1316                          epctrl->bInterval ? epctrl->bInterval : 0xff);
1317         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1318         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1319
1320         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1321
1322         acm_set_control(acm, acm->ctrlout);
1323
1324         acm->line.dwDTERate = cpu_to_le32(9600);
1325         acm->line.bDataBits = 8;
1326         acm_set_line(acm, &acm->line);
1327
1328         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1329         usb_set_intfdata(data_interface, acm);
1330
1331         usb_get_intf(control_interface);
1332         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1333                         &control_interface->dev);
1334         if (IS_ERR(tty_dev)) {
1335                 rv = PTR_ERR(tty_dev);
1336                 goto alloc_fail8;
1337         }
1338
1339         return 0;
1340 alloc_fail8:
1341         if (acm->country_codes) {
1342                 device_remove_file(&acm->control->dev,
1343                                 &dev_attr_wCountryCodes);
1344                 device_remove_file(&acm->control->dev,
1345                                 &dev_attr_iCountryCodeRelDate);
1346         }
1347         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1348 alloc_fail7:
1349         usb_set_intfdata(intf, NULL);
1350         for (i = 0; i < ACM_NW; i++)
1351                 usb_free_urb(acm->wb[i].urb);
1352 alloc_fail6:
1353         for (i = 0; i < num_rx_buf; i++)
1354                 usb_free_urb(acm->read_urbs[i]);
1355         acm_read_buffers_free(acm);
1356         usb_free_urb(acm->ctrlurb);
1357 alloc_fail5:
1358         acm_write_buffers_free(acm);
1359 alloc_fail4:
1360         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1361 alloc_fail2:
1362         acm_release_minor(acm);
1363         kfree(acm);
1364 alloc_fail:
1365         return rv;
1366 }
1367
1368 static void stop_data_traffic(struct acm *acm)
1369 {
1370         int i;
1371
1372         dev_dbg(&acm->control->dev, "%s\n", __func__);
1373
1374         usb_kill_urb(acm->ctrlurb);
1375         for (i = 0; i < ACM_NW; i++)
1376                 usb_kill_urb(acm->wb[i].urb);
1377         for (i = 0; i < acm->rx_buflimit; i++)
1378                 usb_kill_urb(acm->read_urbs[i]);
1379
1380         cancel_work_sync(&acm->work);
1381 }
1382
1383 static void acm_disconnect(struct usb_interface *intf)
1384 {
1385         struct acm *acm = usb_get_intfdata(intf);
1386         struct usb_device *usb_dev = interface_to_usbdev(intf);
1387         struct tty_struct *tty;
1388         int i;
1389
1390         dev_dbg(&intf->dev, "%s\n", __func__);
1391
1392         /* sibling interface is already cleaning up */
1393         if (!acm)
1394                 return;
1395
1396         mutex_lock(&acm->mutex);
1397         acm->disconnected = true;
1398         if (acm->country_codes) {
1399                 device_remove_file(&acm->control->dev,
1400                                 &dev_attr_wCountryCodes);
1401                 device_remove_file(&acm->control->dev,
1402                                 &dev_attr_iCountryCodeRelDate);
1403         }
1404         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1405         usb_set_intfdata(acm->control, NULL);
1406         usb_set_intfdata(acm->data, NULL);
1407         mutex_unlock(&acm->mutex);
1408
1409         tty = tty_port_tty_get(&acm->port);
1410         if (tty) {
1411                 tty_vhangup(tty);
1412                 tty_kref_put(tty);
1413         }
1414
1415         stop_data_traffic(acm);
1416
1417         tty_unregister_device(acm_tty_driver, acm->minor);
1418
1419         usb_free_urb(acm->ctrlurb);
1420         for (i = 0; i < ACM_NW; i++)
1421                 usb_free_urb(acm->wb[i].urb);
1422         for (i = 0; i < acm->rx_buflimit; i++)
1423                 usb_free_urb(acm->read_urbs[i]);
1424         acm_write_buffers_free(acm);
1425         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1426         acm_read_buffers_free(acm);
1427
1428         if (!acm->combined_interfaces)
1429                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1430                                         acm->data : acm->control);
1431
1432         tty_port_put(&acm->port);
1433 }
1434
1435 #ifdef CONFIG_PM
1436 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1437 {
1438         struct acm *acm = usb_get_intfdata(intf);
1439         int cnt;
1440
1441         if (PMSG_IS_AUTO(message)) {
1442                 int b;
1443
1444                 spin_lock_irq(&acm->write_lock);
1445                 b = acm->transmitting;
1446                 spin_unlock_irq(&acm->write_lock);
1447                 if (b)
1448                         return -EBUSY;
1449         }
1450
1451         spin_lock_irq(&acm->read_lock);
1452         spin_lock(&acm->write_lock);
1453         cnt = acm->susp_count++;
1454         spin_unlock(&acm->write_lock);
1455         spin_unlock_irq(&acm->read_lock);
1456
1457         if (cnt)
1458                 return 0;
1459
1460         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1461                 stop_data_traffic(acm);
1462
1463         return 0;
1464 }
1465
1466 static int acm_resume(struct usb_interface *intf)
1467 {
1468         struct acm *acm = usb_get_intfdata(intf);
1469         struct acm_wb *wb;
1470         int rv = 0;
1471         int cnt;
1472
1473         spin_lock_irq(&acm->read_lock);
1474         acm->susp_count -= 1;
1475         cnt = acm->susp_count;
1476         spin_unlock_irq(&acm->read_lock);
1477
1478         if (cnt)
1479                 return 0;
1480
1481         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1482                 rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1483
1484                 spin_lock_irq(&acm->write_lock);
1485                 if (acm->delayed_wb) {
1486                         wb = acm->delayed_wb;
1487                         acm->delayed_wb = NULL;
1488                         spin_unlock_irq(&acm->write_lock);
1489                         acm_start_wb(acm, wb);
1490                 } else {
1491                         spin_unlock_irq(&acm->write_lock);
1492                 }
1493
1494                 /*
1495                  * delayed error checking because we must
1496                  * do the write path at all cost
1497                  */
1498                 if (rv < 0)
1499                         goto err_out;
1500
1501                 rv = acm_submit_read_urbs(acm, GFP_NOIO);
1502         }
1503
1504 err_out:
1505         return rv;
1506 }
1507
1508 static int acm_reset_resume(struct usb_interface *intf)
1509 {
1510         struct acm *acm = usb_get_intfdata(intf);
1511
1512         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1513                 tty_port_tty_hangup(&acm->port, false);
1514
1515         return acm_resume(intf);
1516 }
1517
1518 #endif /* CONFIG_PM */
1519
1520 #define NOKIA_PCSUITE_ACM_INFO(x) \
1521                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1522                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1523                 USB_CDC_ACM_PROTO_VENDOR)
1524
1525 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1526                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1527                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1528                 USB_CDC_ACM_PROTO_VENDOR)
1529
1530 /*
1531  * USB driver structure.
1532  */
1533
1534 static const struct usb_device_id acm_ids[] = {
1535         /* quirky and broken devices */
1536         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1537         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1538         },
1539         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1540         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1541         },
1542         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1543         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1544         },
1545         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1546         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1547         },
1548         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1549         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1550         },
1551         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1552         .driver_info = SINGLE_RX_URB,
1553         },
1554         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1555         .driver_info = SINGLE_RX_URB, /* firmware bug */
1556         },
1557         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1558         .driver_info = SINGLE_RX_URB, /* firmware bug */
1559         },
1560         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1561         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1562         },
1563         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1564         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1565         },
1566         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1567         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1568         },
1569         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1570         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1571         },
1572         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1573         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1574         },
1575         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1576         },
1577         /* Motorola H24 HSPA module: */
1578         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1579         { USB_DEVICE(0x22b8, 0x2d92) }, /* modem           + diagnostics        */
1580         { USB_DEVICE(0x22b8, 0x2d93) }, /* modem + AT port                      */
1581         { USB_DEVICE(0x22b8, 0x2d95) }, /* modem + AT port + diagnostics        */
1582         { USB_DEVICE(0x22b8, 0x2d96) }, /* modem                         + NMEA */
1583         { USB_DEVICE(0x22b8, 0x2d97) }, /* modem           + diagnostics + NMEA */
1584         { USB_DEVICE(0x22b8, 0x2d99) }, /* modem + AT port               + NMEA */
1585         { USB_DEVICE(0x22b8, 0x2d9a) }, /* modem + AT port + diagnostics + NMEA */
1586
1587         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1588         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1589                                            data interface instead of
1590                                            communications interface.
1591                                            Maybe we should define a new
1592                                            quirk for this. */
1593         },
1594         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1595         .driver_info = NO_UNION_NORMAL,
1596         },
1597         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1598         .driver_info = NO_UNION_NORMAL,
1599         },
1600         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1601         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1602         },
1603         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1604         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1605         },
1606
1607         /* Nokia S60 phones expose two ACM channels. The first is
1608          * a modem and is picked up by the standard AT-command
1609          * information below. The second is 'vendor-specific' but
1610          * is treated as a serial device at the S60 end, so we want
1611          * to expose it on Linux too. */
1612         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1613         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1614         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1615         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1616         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1617         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1618         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1619         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1620         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1621         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1622         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1623         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1624         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1625         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1626         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1627         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1628         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1629         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1630         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1631         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1632         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1633         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1634         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1635         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1636         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1637         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1638         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1639         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1640         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1641         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1642         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1643         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1644         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1645         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1646         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1647         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1648         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1649         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1650         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1651         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1652         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1653         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1654         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1655         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1656         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1657         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1658         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1659         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1660         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1661         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1662         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1663         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1664         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1665         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1666         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1667         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1668         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1669         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1670
1671         /* Support for Owen devices */
1672         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1673
1674         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1675
1676         /* Support Lego NXT using pbLua firmware */
1677         { USB_DEVICE(0x0694, 0xff00),
1678         .driver_info = NOT_A_MODEM,
1679         },
1680
1681         /* Support for Droids MuIn LCD */
1682         { USB_DEVICE(0x04d8, 0x000b),
1683         .driver_info = NO_DATA_INTERFACE,
1684         },
1685
1686         /* control interfaces without any protocol set */
1687         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1688                 USB_CDC_PROTO_NONE) },
1689
1690         /* control interfaces with various AT-command sets */
1691         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1692                 USB_CDC_ACM_PROTO_AT_V25TER) },
1693         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1694                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1695         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1696                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1697         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1698                 USB_CDC_ACM_PROTO_AT_GSM) },
1699         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1700                 USB_CDC_ACM_PROTO_AT_3G) },
1701         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1702                 USB_CDC_ACM_PROTO_AT_CDMA) },
1703
1704         { }
1705 };
1706
1707 MODULE_DEVICE_TABLE(usb, acm_ids);
1708
1709 static struct usb_driver acm_driver = {
1710         .name =         "cdc_acm",
1711         .probe =        acm_probe,
1712         .disconnect =   acm_disconnect,
1713 #ifdef CONFIG_PM
1714         .suspend =      acm_suspend,
1715         .resume =       acm_resume,
1716         .reset_resume = acm_reset_resume,
1717 #endif
1718         .id_table =     acm_ids,
1719 #ifdef CONFIG_PM
1720         .supports_autosuspend = 1,
1721 #endif
1722         .disable_hub_initiated_lpm = 1,
1723 };
1724
1725 /*
1726  * TTY driver structures.
1727  */
1728
1729 static const struct tty_operations acm_ops = {
1730         .install =              acm_tty_install,
1731         .open =                 acm_tty_open,
1732         .close =                acm_tty_close,
1733         .cleanup =              acm_tty_cleanup,
1734         .hangup =               acm_tty_hangup,
1735         .write =                acm_tty_write,
1736         .write_room =           acm_tty_write_room,
1737         .ioctl =                acm_tty_ioctl,
1738         .throttle =             acm_tty_throttle,
1739         .unthrottle =           acm_tty_unthrottle,
1740         .chars_in_buffer =      acm_tty_chars_in_buffer,
1741         .break_ctl =            acm_tty_break_ctl,
1742         .set_termios =          acm_tty_set_termios,
1743         .tiocmget =             acm_tty_tiocmget,
1744         .tiocmset =             acm_tty_tiocmset,
1745 };
1746
1747 /*
1748  * Init / exit.
1749  */
1750
1751 static int __init acm_init(void)
1752 {
1753         int retval;
1754         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1755         if (!acm_tty_driver)
1756                 return -ENOMEM;
1757         acm_tty_driver->driver_name = "acm",
1758         acm_tty_driver->name = "ttyACM",
1759         acm_tty_driver->major = ACM_TTY_MAJOR,
1760         acm_tty_driver->minor_start = 0,
1761         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1762         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1763         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1764         acm_tty_driver->init_termios = tty_std_termios;
1765         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1766                                                                 HUPCL | CLOCAL;
1767         tty_set_operations(acm_tty_driver, &acm_ops);
1768
1769         retval = tty_register_driver(acm_tty_driver);
1770         if (retval) {
1771                 put_tty_driver(acm_tty_driver);
1772                 return retval;
1773         }
1774
1775         retval = usb_register(&acm_driver);
1776         if (retval) {
1777                 tty_unregister_driver(acm_tty_driver);
1778                 put_tty_driver(acm_tty_driver);
1779                 return retval;
1780         }
1781
1782         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1783
1784         return 0;
1785 }
1786
1787 static void __exit acm_exit(void)
1788 {
1789         usb_deregister(&acm_driver);
1790         tty_unregister_driver(acm_tty_driver);
1791         put_tty_driver(acm_tty_driver);
1792 }
1793
1794 module_init(acm_init);
1795 module_exit(acm_exit);
1796
1797 MODULE_AUTHOR(DRIVER_AUTHOR);
1798 MODULE_DESCRIPTION(DRIVER_DESC);
1799 MODULE_LICENSE("GPL");
1800 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);