Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[~shefty/rdma-dev.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 void acm_tty_set_termios(struct tty_struct *tty,
832                                                 struct ktermios *termios_old)
833 {
834         struct acm *acm = tty->driver_data;
835         struct ktermios *termios = &tty->termios;
836         struct usb_cdc_line_coding newline;
837         int newctrl = acm->ctrlout;
838
839         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
840         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
841         newline.bParityType = termios->c_cflag & PARENB ?
842                                 (termios->c_cflag & PARODD ? 1 : 2) +
843                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
844         switch (termios->c_cflag & CSIZE) {
845         case CS5:
846                 newline.bDataBits = 5;
847                 break;
848         case CS6:
849                 newline.bDataBits = 6;
850                 break;
851         case CS7:
852                 newline.bDataBits = 7;
853                 break;
854         case CS8:
855         default:
856                 newline.bDataBits = 8;
857                 break;
858         }
859         /* FIXME: Needs to clear unsupported bits in the termios */
860         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
861
862         if (!newline.dwDTERate) {
863                 newline.dwDTERate = acm->line.dwDTERate;
864                 newctrl &= ~ACM_CTRL_DTR;
865         } else
866                 newctrl |=  ACM_CTRL_DTR;
867
868         if (newctrl != acm->ctrlout)
869                 acm_set_control(acm, acm->ctrlout = newctrl);
870
871         if (memcmp(&acm->line, &newline, sizeof newline)) {
872                 memcpy(&acm->line, &newline, sizeof newline);
873                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
874                         __func__,
875                         le32_to_cpu(newline.dwDTERate),
876                         newline.bCharFormat, newline.bParityType,
877                         newline.bDataBits);
878                 acm_set_line(acm, &acm->line);
879         }
880 }
881
882 static const struct tty_port_operations acm_port_ops = {
883         .shutdown = acm_port_shutdown,
884         .activate = acm_port_activate,
885         .destruct = acm_port_destruct,
886 };
887
888 /*
889  * USB probe and disconnect routines.
890  */
891
892 /* Little helpers: write/read buffers free */
893 static void acm_write_buffers_free(struct acm *acm)
894 {
895         int i;
896         struct acm_wb *wb;
897         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
898
899         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
900                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
901 }
902
903 static void acm_read_buffers_free(struct acm *acm)
904 {
905         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
906         int i;
907
908         for (i = 0; i < acm->rx_buflimit; i++)
909                 usb_free_coherent(usb_dev, acm->readsize,
910                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
911 }
912
913 /* Little helper: write buffers allocate */
914 static int acm_write_buffers_alloc(struct acm *acm)
915 {
916         int i;
917         struct acm_wb *wb;
918
919         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
920                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
921                     &wb->dmah);
922                 if (!wb->buf) {
923                         while (i != 0) {
924                                 --i;
925                                 --wb;
926                                 usb_free_coherent(acm->dev, acm->writesize,
927                                     wb->buf, wb->dmah);
928                         }
929                         return -ENOMEM;
930                 }
931         }
932         return 0;
933 }
934
935 static int acm_probe(struct usb_interface *intf,
936                      const struct usb_device_id *id)
937 {
938         struct usb_cdc_union_desc *union_header = NULL;
939         struct usb_cdc_country_functional_desc *cfd = NULL;
940         unsigned char *buffer = intf->altsetting->extra;
941         int buflen = intf->altsetting->extralen;
942         struct usb_interface *control_interface;
943         struct usb_interface *data_interface;
944         struct usb_endpoint_descriptor *epctrl = NULL;
945         struct usb_endpoint_descriptor *epread = NULL;
946         struct usb_endpoint_descriptor *epwrite = NULL;
947         struct usb_device *usb_dev = interface_to_usbdev(intf);
948         struct acm *acm;
949         int minor;
950         int ctrlsize, readsize;
951         u8 *buf;
952         u8 ac_management_function = 0;
953         u8 call_management_function = 0;
954         int call_interface_num = -1;
955         int data_interface_num = -1;
956         unsigned long quirks;
957         int num_rx_buf;
958         int i;
959         int combined_interfaces = 0;
960         struct device *tty_dev;
961         int rv = -ENOMEM;
962
963         /* normal quirks */
964         quirks = (unsigned long)id->driver_info;
965
966         if (quirks == IGNORE_DEVICE)
967                 return -ENODEV;
968
969         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
970
971         /* handle quirks deadly to normal probing*/
972         if (quirks == NO_UNION_NORMAL) {
973                 data_interface = usb_ifnum_to_if(usb_dev, 1);
974                 control_interface = usb_ifnum_to_if(usb_dev, 0);
975                 goto skip_normal_probe;
976         }
977
978         /* normal probing*/
979         if (!buffer) {
980                 dev_err(&intf->dev, "Weird descriptor references\n");
981                 return -EINVAL;
982         }
983
984         if (!buflen) {
985                 if (intf->cur_altsetting->endpoint &&
986                                 intf->cur_altsetting->endpoint->extralen &&
987                                 intf->cur_altsetting->endpoint->extra) {
988                         dev_dbg(&intf->dev,
989                                 "Seeking extra descriptors on endpoint\n");
990                         buflen = intf->cur_altsetting->endpoint->extralen;
991                         buffer = intf->cur_altsetting->endpoint->extra;
992                 } else {
993                         dev_err(&intf->dev,
994                                 "Zero length descriptor references\n");
995                         return -EINVAL;
996                 }
997         }
998
999         while (buflen > 0) {
1000                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1001                         dev_err(&intf->dev, "skipping garbage\n");
1002                         goto next_desc;
1003                 }
1004
1005                 switch (buffer[2]) {
1006                 case USB_CDC_UNION_TYPE: /* we've found it */
1007                         if (union_header) {
1008                                 dev_err(&intf->dev, "More than one "
1009                                         "union descriptor, skipping ...\n");
1010                                 goto next_desc;
1011                         }
1012                         union_header = (struct usb_cdc_union_desc *)buffer;
1013                         break;
1014                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1015                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1016                         break;
1017                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1018                         break; /* for now we ignore it */
1019                 case USB_CDC_ACM_TYPE:
1020                         ac_management_function = buffer[3];
1021                         break;
1022                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1023                         call_management_function = buffer[3];
1024                         call_interface_num = buffer[4];
1025                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1026                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1027                         break;
1028                 default:
1029                         /* there are LOTS more CDC descriptors that
1030                          * could legitimately be found here.
1031                          */
1032                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1033                                         "type %02x, length %d\n",
1034                                         buffer[2], buffer[0]);
1035                         break;
1036                 }
1037 next_desc:
1038                 buflen -= buffer[0];
1039                 buffer += buffer[0];
1040         }
1041
1042         if (!union_header) {
1043                 if (call_interface_num > 0) {
1044                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1045                         /* quirks for Droids MuIn LCD */
1046                         if (quirks & NO_DATA_INTERFACE)
1047                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1048                         else
1049                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1050                         control_interface = intf;
1051                 } else {
1052                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1053                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1054                                 return -ENODEV;
1055                         } else {
1056                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1057                                 combined_interfaces = 1;
1058                                 control_interface = data_interface = intf;
1059                                 goto look_for_collapsed_interface;
1060                         }
1061                 }
1062         } else {
1063                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1064                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1065                 if (!control_interface || !data_interface) {
1066                         dev_dbg(&intf->dev, "no interfaces\n");
1067                         return -ENODEV;
1068                 }
1069         }
1070
1071         if (data_interface_num != call_interface_num)
1072                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1073
1074         if (control_interface == data_interface) {
1075                 /* some broken devices designed for windows work this way */
1076                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1077                 combined_interfaces = 1;
1078                 /* a popular other OS doesn't use it */
1079                 quirks |= NO_CAP_LINE;
1080                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1081                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1082                         return -EINVAL;
1083                 }
1084 look_for_collapsed_interface:
1085                 for (i = 0; i < 3; i++) {
1086                         struct usb_endpoint_descriptor *ep;
1087                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1088
1089                         if (usb_endpoint_is_int_in(ep))
1090                                 epctrl = ep;
1091                         else if (usb_endpoint_is_bulk_out(ep))
1092                                 epwrite = ep;
1093                         else if (usb_endpoint_is_bulk_in(ep))
1094                                 epread = ep;
1095                         else
1096                                 return -EINVAL;
1097                 }
1098                 if (!epctrl || !epread || !epwrite)
1099                         return -ENODEV;
1100                 else
1101                         goto made_compressed_probe;
1102         }
1103
1104 skip_normal_probe:
1105
1106         /*workaround for switched interfaces */
1107         if (data_interface->cur_altsetting->desc.bInterfaceClass
1108                                                 != CDC_DATA_INTERFACE_TYPE) {
1109                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1110                                                 == CDC_DATA_INTERFACE_TYPE) {
1111                         struct usb_interface *t;
1112                         dev_dbg(&intf->dev,
1113                                 "Your device has switched interfaces.\n");
1114                         t = control_interface;
1115                         control_interface = data_interface;
1116                         data_interface = t;
1117                 } else {
1118                         return -EINVAL;
1119                 }
1120         }
1121
1122         /* Accept probe requests only for the control interface */
1123         if (!combined_interfaces && intf != control_interface)
1124                 return -ENODEV;
1125
1126         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1127                 /* valid in this context */
1128                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1129                 return -EBUSY;
1130         }
1131
1132
1133         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1134             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1135                 return -EINVAL;
1136
1137         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1138         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1139         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1140
1141
1142         /* workaround for switched endpoints */
1143         if (!usb_endpoint_dir_in(epread)) {
1144                 /* descriptors are swapped */
1145                 struct usb_endpoint_descriptor *t;
1146                 dev_dbg(&intf->dev,
1147                         "The data interface has switched endpoints\n");
1148                 t = epread;
1149                 epread = epwrite;
1150                 epwrite = t;
1151         }
1152 made_compressed_probe:
1153         dev_dbg(&intf->dev, "interfaces are valid\n");
1154
1155         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1156         if (acm == NULL) {
1157                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1158                 goto alloc_fail;
1159         }
1160
1161         minor = acm_alloc_minor(acm);
1162         if (minor == ACM_TTY_MINORS) {
1163                 dev_err(&intf->dev, "no more free acm devices\n");
1164                 kfree(acm);
1165                 return -ENODEV;
1166         }
1167
1168         ctrlsize = usb_endpoint_maxp(epctrl);
1169         readsize = usb_endpoint_maxp(epread) *
1170                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1171         acm->combined_interfaces = combined_interfaces;
1172         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1173         acm->control = control_interface;
1174         acm->data = data_interface;
1175         acm->minor = minor;
1176         acm->dev = usb_dev;
1177         acm->ctrl_caps = ac_management_function;
1178         if (quirks & NO_CAP_LINE)
1179                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1180         acm->ctrlsize = ctrlsize;
1181         acm->readsize = readsize;
1182         acm->rx_buflimit = num_rx_buf;
1183         INIT_WORK(&acm->work, acm_softint);
1184         spin_lock_init(&acm->write_lock);
1185         spin_lock_init(&acm->read_lock);
1186         mutex_init(&acm->mutex);
1187         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1188         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1189         if (acm->is_int_ep)
1190                 acm->bInterval = epread->bInterval;
1191         tty_port_init(&acm->port);
1192         acm->port.ops = &acm_port_ops;
1193
1194         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1195         if (!buf) {
1196                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1197                 goto alloc_fail2;
1198         }
1199         acm->ctrl_buffer = buf;
1200
1201         if (acm_write_buffers_alloc(acm) < 0) {
1202                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1203                 goto alloc_fail4;
1204         }
1205
1206         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1207         if (!acm->ctrlurb) {
1208                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1209                 goto alloc_fail5;
1210         }
1211         for (i = 0; i < num_rx_buf; i++) {
1212                 struct acm_rb *rb = &(acm->read_buffers[i]);
1213                 struct urb *urb;
1214
1215                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1216                                                                 &rb->dma);
1217                 if (!rb->base) {
1218                         dev_err(&intf->dev, "out of memory "
1219                                         "(read bufs usb_alloc_coherent)\n");
1220                         goto alloc_fail6;
1221                 }
1222                 rb->index = i;
1223                 rb->instance = acm;
1224
1225                 urb = usb_alloc_urb(0, GFP_KERNEL);
1226                 if (!urb) {
1227                         dev_err(&intf->dev,
1228                                 "out of memory (read urbs usb_alloc_urb)\n");
1229                         goto alloc_fail6;
1230                 }
1231                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1232                 urb->transfer_dma = rb->dma;
1233                 if (acm->is_int_ep) {
1234                         usb_fill_int_urb(urb, acm->dev,
1235                                          acm->rx_endpoint,
1236                                          rb->base,
1237                                          acm->readsize,
1238                                          acm_read_bulk_callback, rb,
1239                                          acm->bInterval);
1240                 } else {
1241                         usb_fill_bulk_urb(urb, acm->dev,
1242                                           acm->rx_endpoint,
1243                                           rb->base,
1244                                           acm->readsize,
1245                                           acm_read_bulk_callback, rb);
1246                 }
1247
1248                 acm->read_urbs[i] = urb;
1249                 __set_bit(i, &acm->read_urbs_free);
1250         }
1251         for (i = 0; i < ACM_NW; i++) {
1252                 struct acm_wb *snd = &(acm->wb[i]);
1253
1254                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1255                 if (snd->urb == NULL) {
1256                         dev_err(&intf->dev,
1257                                 "out of memory (write urbs usb_alloc_urb)\n");
1258                         goto alloc_fail7;
1259                 }
1260
1261                 if (usb_endpoint_xfer_int(epwrite))
1262                         usb_fill_int_urb(snd->urb, usb_dev,
1263                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1264                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1265                 else
1266                         usb_fill_bulk_urb(snd->urb, usb_dev,
1267                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1268                                 NULL, acm->writesize, acm_write_bulk, snd);
1269                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1270                 snd->instance = acm;
1271         }
1272
1273         usb_set_intfdata(intf, acm);
1274
1275         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1276         if (i < 0)
1277                 goto alloc_fail7;
1278
1279         if (cfd) { /* export the country data */
1280                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1281                 if (!acm->country_codes)
1282                         goto skip_countries;
1283                 acm->country_code_size = cfd->bLength - 4;
1284                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1285                                                         cfd->bLength - 4);
1286                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1287
1288                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1289                 if (i < 0) {
1290                         kfree(acm->country_codes);
1291                         acm->country_codes = NULL;
1292                         acm->country_code_size = 0;
1293                         goto skip_countries;
1294                 }
1295
1296                 i = device_create_file(&intf->dev,
1297                                                 &dev_attr_iCountryCodeRelDate);
1298                 if (i < 0) {
1299                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1300                         kfree(acm->country_codes);
1301                         acm->country_codes = NULL;
1302                         acm->country_code_size = 0;
1303                         goto skip_countries;
1304                 }
1305         }
1306
1307 skip_countries:
1308         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1309                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1310                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1311                          /* works around buggy devices */
1312                          epctrl->bInterval ? epctrl->bInterval : 0xff);
1313         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1314         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1315
1316         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1317
1318         acm_set_control(acm, acm->ctrlout);
1319
1320         acm->line.dwDTERate = cpu_to_le32(9600);
1321         acm->line.bDataBits = 8;
1322         acm_set_line(acm, &acm->line);
1323
1324         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1325         usb_set_intfdata(data_interface, acm);
1326
1327         usb_get_intf(control_interface);
1328         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1329                         &control_interface->dev);
1330         if (IS_ERR(tty_dev)) {
1331                 rv = PTR_ERR(tty_dev);
1332                 goto alloc_fail8;
1333         }
1334
1335         return 0;
1336 alloc_fail8:
1337         if (acm->country_codes) {
1338                 device_remove_file(&acm->control->dev,
1339                                 &dev_attr_wCountryCodes);
1340                 device_remove_file(&acm->control->dev,
1341                                 &dev_attr_iCountryCodeRelDate);
1342         }
1343         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1344 alloc_fail7:
1345         usb_set_intfdata(intf, NULL);
1346         for (i = 0; i < ACM_NW; i++)
1347                 usb_free_urb(acm->wb[i].urb);
1348 alloc_fail6:
1349         for (i = 0; i < num_rx_buf; i++)
1350                 usb_free_urb(acm->read_urbs[i]);
1351         acm_read_buffers_free(acm);
1352         usb_free_urb(acm->ctrlurb);
1353 alloc_fail5:
1354         acm_write_buffers_free(acm);
1355 alloc_fail4:
1356         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1357 alloc_fail2:
1358         acm_release_minor(acm);
1359         kfree(acm);
1360 alloc_fail:
1361         return rv;
1362 }
1363
1364 static void stop_data_traffic(struct acm *acm)
1365 {
1366         int i;
1367
1368         dev_dbg(&acm->control->dev, "%s\n", __func__);
1369
1370         usb_kill_urb(acm->ctrlurb);
1371         for (i = 0; i < ACM_NW; i++)
1372                 usb_kill_urb(acm->wb[i].urb);
1373         for (i = 0; i < acm->rx_buflimit; i++)
1374                 usb_kill_urb(acm->read_urbs[i]);
1375
1376         cancel_work_sync(&acm->work);
1377 }
1378
1379 static void acm_disconnect(struct usb_interface *intf)
1380 {
1381         struct acm *acm = usb_get_intfdata(intf);
1382         struct usb_device *usb_dev = interface_to_usbdev(intf);
1383         struct tty_struct *tty;
1384         int i;
1385
1386         dev_dbg(&intf->dev, "%s\n", __func__);
1387
1388         /* sibling interface is already cleaning up */
1389         if (!acm)
1390                 return;
1391
1392         mutex_lock(&acm->mutex);
1393         acm->disconnected = true;
1394         if (acm->country_codes) {
1395                 device_remove_file(&acm->control->dev,
1396                                 &dev_attr_wCountryCodes);
1397                 device_remove_file(&acm->control->dev,
1398                                 &dev_attr_iCountryCodeRelDate);
1399         }
1400         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1401         usb_set_intfdata(acm->control, NULL);
1402         usb_set_intfdata(acm->data, NULL);
1403         mutex_unlock(&acm->mutex);
1404
1405         tty = tty_port_tty_get(&acm->port);
1406         if (tty) {
1407                 tty_vhangup(tty);
1408                 tty_kref_put(tty);
1409         }
1410
1411         stop_data_traffic(acm);
1412
1413         tty_unregister_device(acm_tty_driver, acm->minor);
1414
1415         usb_free_urb(acm->ctrlurb);
1416         for (i = 0; i < ACM_NW; i++)
1417                 usb_free_urb(acm->wb[i].urb);
1418         for (i = 0; i < acm->rx_buflimit; i++)
1419                 usb_free_urb(acm->read_urbs[i]);
1420         acm_write_buffers_free(acm);
1421         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1422         acm_read_buffers_free(acm);
1423
1424         if (!acm->combined_interfaces)
1425                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1426                                         acm->data : acm->control);
1427
1428         tty_port_put(&acm->port);
1429 }
1430
1431 #ifdef CONFIG_PM
1432 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1433 {
1434         struct acm *acm = usb_get_intfdata(intf);
1435         int cnt;
1436
1437         if (PMSG_IS_AUTO(message)) {
1438                 int b;
1439
1440                 spin_lock_irq(&acm->write_lock);
1441                 b = acm->transmitting;
1442                 spin_unlock_irq(&acm->write_lock);
1443                 if (b)
1444                         return -EBUSY;
1445         }
1446
1447         spin_lock_irq(&acm->read_lock);
1448         spin_lock(&acm->write_lock);
1449         cnt = acm->susp_count++;
1450         spin_unlock(&acm->write_lock);
1451         spin_unlock_irq(&acm->read_lock);
1452
1453         if (cnt)
1454                 return 0;
1455
1456         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1457                 stop_data_traffic(acm);
1458
1459         return 0;
1460 }
1461
1462 static int acm_resume(struct usb_interface *intf)
1463 {
1464         struct acm *acm = usb_get_intfdata(intf);
1465         struct acm_wb *wb;
1466         int rv = 0;
1467         int cnt;
1468
1469         spin_lock_irq(&acm->read_lock);
1470         acm->susp_count -= 1;
1471         cnt = acm->susp_count;
1472         spin_unlock_irq(&acm->read_lock);
1473
1474         if (cnt)
1475                 return 0;
1476
1477         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1478                 rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1479
1480                 spin_lock_irq(&acm->write_lock);
1481                 if (acm->delayed_wb) {
1482                         wb = acm->delayed_wb;
1483                         acm->delayed_wb = NULL;
1484                         spin_unlock_irq(&acm->write_lock);
1485                         acm_start_wb(acm, wb);
1486                 } else {
1487                         spin_unlock_irq(&acm->write_lock);
1488                 }
1489
1490                 /*
1491                  * delayed error checking because we must
1492                  * do the write path at all cost
1493                  */
1494                 if (rv < 0)
1495                         goto err_out;
1496
1497                 rv = acm_submit_read_urbs(acm, GFP_NOIO);
1498         }
1499
1500 err_out:
1501         return rv;
1502 }
1503
1504 static int acm_reset_resume(struct usb_interface *intf)
1505 {
1506         struct acm *acm = usb_get_intfdata(intf);
1507
1508         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1509                 tty_port_tty_hangup(&acm->port, false);
1510
1511         return acm_resume(intf);
1512 }
1513
1514 #endif /* CONFIG_PM */
1515
1516 #define NOKIA_PCSUITE_ACM_INFO(x) \
1517                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1518                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1519                 USB_CDC_ACM_PROTO_VENDOR)
1520
1521 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1522                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1523                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1524                 USB_CDC_ACM_PROTO_VENDOR)
1525
1526 /*
1527  * USB driver structure.
1528  */
1529
1530 static const struct usb_device_id acm_ids[] = {
1531         /* quirky and broken devices */
1532         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1533         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1534         },
1535         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1536         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1537         },
1538         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1539         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1540         },
1541         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1542         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1543         },
1544         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1545         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1546         },
1547         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1548         .driver_info = SINGLE_RX_URB,
1549         },
1550         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1551         .driver_info = SINGLE_RX_URB, /* firmware bug */
1552         },
1553         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1554         .driver_info = SINGLE_RX_URB, /* firmware bug */
1555         },
1556         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1557         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1558         },
1559         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1560         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1561         },
1562         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1563         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1564         },
1565         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1566         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1567         },
1568         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1569         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1570         },
1571         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1572         },
1573         /* Motorola H24 HSPA module: */
1574         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1575         { USB_DEVICE(0x22b8, 0x2d92) }, /* modem           + diagnostics        */
1576         { USB_DEVICE(0x22b8, 0x2d93) }, /* modem + AT port                      */
1577         { USB_DEVICE(0x22b8, 0x2d95) }, /* modem + AT port + diagnostics        */
1578         { USB_DEVICE(0x22b8, 0x2d96) }, /* modem                         + NMEA */
1579         { USB_DEVICE(0x22b8, 0x2d97) }, /* modem           + diagnostics + NMEA */
1580         { USB_DEVICE(0x22b8, 0x2d99) }, /* modem + AT port               + NMEA */
1581         { USB_DEVICE(0x22b8, 0x2d9a) }, /* modem + AT port + diagnostics + NMEA */
1582
1583         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1584         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1585                                            data interface instead of
1586                                            communications interface.
1587                                            Maybe we should define a new
1588                                            quirk for this. */
1589         },
1590         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1591         .driver_info = NO_UNION_NORMAL,
1592         },
1593         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1594         .driver_info = NO_UNION_NORMAL,
1595         },
1596         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1597         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1598         },
1599         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1600         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1601         },
1602
1603         /* Nokia S60 phones expose two ACM channels. The first is
1604          * a modem and is picked up by the standard AT-command
1605          * information below. The second is 'vendor-specific' but
1606          * is treated as a serial device at the S60 end, so we want
1607          * to expose it on Linux too. */
1608         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1609         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1610         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1611         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1612         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1613         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1614         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1615         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1616         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1617         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1618         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1619         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1620         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1621         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1622         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1623         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1624         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1625         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1626         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1627         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1628         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1629         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1630         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1631         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1632         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1633         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1634         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1635         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1636         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1637         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1638         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1639         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1640         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1641         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1642         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1643         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1644         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1645         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1646         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1647         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1648         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1649         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1650         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1651         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1652         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1653         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1654         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1655         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1656         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1657         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1658         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1659         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1660         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1661         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1662         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1663         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1664         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1665         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1666
1667         /* Support for Owen devices */
1668         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1669
1670         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1671
1672         /* Support Lego NXT using pbLua firmware */
1673         { USB_DEVICE(0x0694, 0xff00),
1674         .driver_info = NOT_A_MODEM,
1675         },
1676
1677         /* Support for Droids MuIn LCD */
1678         { USB_DEVICE(0x04d8, 0x000b),
1679         .driver_info = NO_DATA_INTERFACE,
1680         },
1681
1682 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1683         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1684         .driver_info = IGNORE_DEVICE,
1685         },
1686         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1687         .driver_info = IGNORE_DEVICE,
1688         },
1689 #endif
1690
1691         /* control interfaces without any protocol set */
1692         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1693                 USB_CDC_PROTO_NONE) },
1694
1695         /* control interfaces with various AT-command sets */
1696         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1697                 USB_CDC_ACM_PROTO_AT_V25TER) },
1698         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1699                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1700         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1701                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1702         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1703                 USB_CDC_ACM_PROTO_AT_GSM) },
1704         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1705                 USB_CDC_ACM_PROTO_AT_3G) },
1706         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1707                 USB_CDC_ACM_PROTO_AT_CDMA) },
1708
1709         { }
1710 };
1711
1712 MODULE_DEVICE_TABLE(usb, acm_ids);
1713
1714 static struct usb_driver acm_driver = {
1715         .name =         "cdc_acm",
1716         .probe =        acm_probe,
1717         .disconnect =   acm_disconnect,
1718 #ifdef CONFIG_PM
1719         .suspend =      acm_suspend,
1720         .resume =       acm_resume,
1721         .reset_resume = acm_reset_resume,
1722 #endif
1723         .id_table =     acm_ids,
1724 #ifdef CONFIG_PM
1725         .supports_autosuspend = 1,
1726 #endif
1727         .disable_hub_initiated_lpm = 1,
1728 };
1729
1730 /*
1731  * TTY driver structures.
1732  */
1733
1734 static const struct tty_operations acm_ops = {
1735         .install =              acm_tty_install,
1736         .open =                 acm_tty_open,
1737         .close =                acm_tty_close,
1738         .cleanup =              acm_tty_cleanup,
1739         .hangup =               acm_tty_hangup,
1740         .write =                acm_tty_write,
1741         .write_room =           acm_tty_write_room,
1742         .ioctl =                acm_tty_ioctl,
1743         .throttle =             acm_tty_throttle,
1744         .unthrottle =           acm_tty_unthrottle,
1745         .chars_in_buffer =      acm_tty_chars_in_buffer,
1746         .break_ctl =            acm_tty_break_ctl,
1747         .set_termios =          acm_tty_set_termios,
1748         .tiocmget =             acm_tty_tiocmget,
1749         .tiocmset =             acm_tty_tiocmset,
1750 };
1751
1752 /*
1753  * Init / exit.
1754  */
1755
1756 static int __init acm_init(void)
1757 {
1758         int retval;
1759         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1760         if (!acm_tty_driver)
1761                 return -ENOMEM;
1762         acm_tty_driver->driver_name = "acm",
1763         acm_tty_driver->name = "ttyACM",
1764         acm_tty_driver->major = ACM_TTY_MAJOR,
1765         acm_tty_driver->minor_start = 0,
1766         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1767         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1768         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1769         acm_tty_driver->init_termios = tty_std_termios;
1770         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1771                                                                 HUPCL | CLOCAL;
1772         tty_set_operations(acm_tty_driver, &acm_ops);
1773
1774         retval = tty_register_driver(acm_tty_driver);
1775         if (retval) {
1776                 put_tty_driver(acm_tty_driver);
1777                 return retval;
1778         }
1779
1780         retval = usb_register(&acm_driver);
1781         if (retval) {
1782                 tty_unregister_driver(acm_tty_driver);
1783                 put_tty_driver(acm_tty_driver);
1784                 return retval;
1785         }
1786
1787         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1788
1789         return 0;
1790 }
1791
1792 static void __exit acm_exit(void)
1793 {
1794         usb_deregister(&acm_driver);
1795         tty_unregister_driver(acm_tty_driver);
1796         put_tty_driver(acm_tty_driver);
1797 }
1798
1799 module_init(acm_init);
1800 module_exit(acm_exit);
1801
1802 MODULE_AUTHOR(DRIVER_AUTHOR);
1803 MODULE_DESCRIPTION(DRIVER_DESC);
1804 MODULE_LICENSE("GPL");
1805 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);