Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/usb/class/cdc-acm.c

  1 /*
  2  * cdc-acm.c
  3  *
  4  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
  5  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
  6  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
  7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
  8  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
  9  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
 10  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
 11  *
 12  * USB Abstract Control Model driver for USB modems and ISDN adapters
 13  *
 14  * Sponsored by SuSE
 15  *
 16  * This program is free software; you can redistribute it and/or modify
 17  * it under the terms of the GNU General Public License as published by
 18  * the Free Software Foundation; either version 2 of the License, or
 19  * (at your option) any later version.
 20  *
 21  * This program is distributed in the hope that it will be useful,
 22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 24  * GNU General Public License for more details.
 25  *
 26  * You should have received a copy of the GNU General Public License
 27  * along with this program; if not, write to the Free Software
 28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 29  */
 30 
 31 #undef DEBUG
 32 #undef VERBOSE_DEBUG
 33 
 34 #include <linux/kernel.h>
 35 #include <linux/errno.h>
 36 #include <linux/init.h>
 37 #include <linux/slab.h>
 38 #include <linux/tty.h>
 39 #include <linux/serial.h>
 40 #include <linux/tty_driver.h>
 41 #include <linux/tty_flip.h>
 42 #include <linux/module.h>
 43 #include <linux/mutex.h>
 44 #include <linux/uaccess.h>
 45 #include <linux/usb.h>
 46 #include <linux/usb/cdc.h>
 47 #include <asm/byteorder.h>
 48 #include <asm/unaligned.h>
 49 #include <linux/list.h>
 50 
 51 #include "cdc-acm.h"
 52 
 53 
 54 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
 55 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
 56 
 57 static struct usb_driver acm_driver;
 58 static struct tty_driver *acm_tty_driver;
 59 static struct acm *acm_table[ACM_TTY_MINORS];
 60 
 61 static DEFINE_MUTEX(acm_table_lock);
 62 
 63 /*
 64  * acm_table accessors
 65  */
 66 
 67 /*
 68  * Look up an ACM structure by index. If found and not disconnected, increment
 69  * its refcount and return it with its mutex held.
 70  */
 71 static struct acm *acm_get_by_index(unsigned index)
 72 {
 73         struct acm *acm;
 74 
 75         mutex_lock(&acm_table_lock);
 76         acm = acm_table[index];
 77         if (acm) {
 78                 mutex_lock(&acm->mutex);
 79                 if (acm->disconnected) {
 80                         mutex_unlock(&acm->mutex);
 81                         acm = NULL;
 82                 } else {
 83                         tty_port_get(&acm->port);
 84                         mutex_unlock(&acm->mutex);
 85                 }
 86         }
 87         mutex_unlock(&acm_table_lock);
 88         return acm;
 89 }
 90 
 91 /*
 92  * Try to find an available minor number and if found, associate it with 'acm'.
 93  */
 94 static int acm_alloc_minor(struct acm *acm)
 95 {
 96         int minor;
 97 
 98         mutex_lock(&acm_table_lock);
 99         for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
100                 if (!acm_table[minor]) {
101                         acm_table[minor] = acm;
102                         break;
103                 }
104         }
105         mutex_unlock(&acm_table_lock);
106 
107         return minor;
108 }
109 
110 /* Release the minor number associated with 'acm'.  */
111 static void acm_release_minor(struct acm *acm)
112 {
113         mutex_lock(&acm_table_lock);
114         acm_table[acm->minor] = NULL;
115         mutex_unlock(&acm_table_lock);
116 }
117 
118 /*
119  * Functions for ACM control messages.
120  */
121 
122 static int acm_ctrl_msg(struct acm *acm, int request, int value,
123                                                         void *buf, int len)
124 {
125         int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
126                 request, USB_RT_ACM, value,
127                 acm->control->altsetting[0].desc.bInterfaceNumber,
128                 buf, len, 5000);
129         dev_dbg(&acm->control->dev,
130                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
131                         __func__, request, value, len, retval);
132         return retval < 0 ? retval : 0;
133 }
134 
135 /* devices aren't required to support these requests.
136  * the cdc acm descriptor tells whether they do...
137  */
138 #define acm_set_control(acm, control) \
139         acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
140 #define acm_set_line(acm, line) \
141         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
142 #define acm_send_break(acm, ms) \
143         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
144 
145 /*
146  * Write buffer management.
147  * All of these assume proper locks taken by the caller.
148  */
149 
150 static int acm_wb_alloc(struct acm *acm)
151 {
152         int i, wbn;
153         struct acm_wb *wb;
154 
155         wbn = 0;
156         i = 0;
157         for (;;) {
158                 wb = &acm->wb[wbn];
159                 if (!wb->use) {
160                         wb->use = 1;
161                         return wbn;
162                 }
163                 wbn = (wbn + 1) % ACM_NW;
164                 if (++i >= ACM_NW)
165                         return -1;
166         }
167 }
168 
169 static int acm_wb_is_avail(struct acm *acm)
170 {
171         int i, n;
172         unsigned long flags;
173 
174         n = ACM_NW;
175         spin_lock_irqsave(&acm->write_lock, flags);
176         for (i = 0; i < ACM_NW; i++)
177                 n -= acm->wb[i].use;
178         spin_unlock_irqrestore(&acm->write_lock, flags);
179         return n;
180 }
181 
182 /*
183  * Finish write. Caller must hold acm->write_lock
184  */
185 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
186 {
187         wb->use = 0;
188         acm->transmitting--;
189         usb_autopm_put_interface_async(acm->control);
190 }
191 
192 /*
193  * Poke write.
194  *
195  * the caller is responsible for locking
196  */
197 
198 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
199 {
200         int rc;
201 
202         acm->transmitting++;
203 
204         wb->urb->transfer_buffer = wb->buf;
205         wb->urb->transfer_dma = wb->dmah;
206         wb->urb->transfer_buffer_length = wb->len;
207         wb->urb->dev = acm->dev;
208 
209         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
210         if (rc < 0) {
211                 dev_err(&acm->data->dev,
212                         "%s - usb_submit_urb(write bulk) failed: %d\n",
213                         __func__, rc);
214                 acm_write_done(acm, wb);
215         }
216         return rc;
217 }
218 
219 /*
220  * attributes exported through sysfs
221  */
222 static ssize_t show_caps
223 (struct device *dev, struct device_attribute *attr, char *buf)
224 {
225         struct usb_interface *intf = to_usb_interface(dev);
226         struct acm *acm = usb_get_intfdata(intf);
227 
228         return sprintf(buf, "%d", acm->ctrl_caps);
229 }
230 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
231 
232 static ssize_t show_country_codes
233 (struct device *dev, struct device_attribute *attr, char *buf)
234 {
235         struct usb_interface *intf = to_usb_interface(dev);
236         struct acm *acm = usb_get_intfdata(intf);
237 
238         memcpy(buf, acm->country_codes, acm->country_code_size);
239         return acm->country_code_size;
240 }
241 
242 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
243 
244 static ssize_t show_country_rel_date
245 (struct device *dev, struct device_attribute *attr, char *buf)
246 {
247         struct usb_interface *intf = to_usb_interface(dev);
248         struct acm *acm = usb_get_intfdata(intf);
249 
250         return sprintf(buf, "%d", acm->country_rel_date);
251 }
252 
253 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
254 /*
255  * Interrupt handlers for various ACM device responses
256  */
257 
258 /* control interface reports status changes with "interrupt" transfers */
259 static void acm_ctrl_irq(struct urb *urb)
260 {
261         struct acm *acm = urb->context;
262         struct usb_cdc_notification *dr = urb->transfer_buffer;
263         unsigned char *data;
264         int newctrl;
265         int difference;
266         int retval;
267         int status = urb->status;
268 
269         switch (status) {
270         case 0:
271                 /* success */
272                 break;
273         case -ECONNRESET:
274         case -ENOENT:
275         case -ESHUTDOWN:
276                 /* this urb is terminated, clean up */
277                 dev_dbg(&acm->control->dev,
278                                 "%s - urb shutting down with status: %d\n",
279                                 __func__, status);
280                 return;
281         default:
282                 dev_dbg(&acm->control->dev,
283                                 "%s - nonzero urb status received: %d\n",
284                                 __func__, status);
285                 goto exit;
286         }
287 
288         usb_mark_last_busy(acm->dev);
289 
290         data = (unsigned char *)(dr + 1);
291         switch (dr->bNotificationType) {
292         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
293                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
294                                                         __func__, dr->wValue);
295                 break;
296 
297         case USB_CDC_NOTIFY_SERIAL_STATE:
298                 newctrl = get_unaligned_le16(data);
299 
300                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
301                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
302                                         __func__);
303                         tty_port_tty_hangup(&acm->port, false);
304                 }
305 
306                 difference = acm->ctrlin ^ newctrl;
307                 spin_lock(&acm->read_lock);
308                 acm->ctrlin = newctrl;
309                 acm->oldcount = acm->iocount;
310 
311                 if (difference & ACM_CTRL_DSR)
312                         acm->iocount.dsr++;
313                 if (difference & ACM_CTRL_BRK)
314                         acm->iocount.brk++;
315                 if (difference & ACM_CTRL_RI)
316                         acm->iocount.rng++;
317                 if (difference & ACM_CTRL_DCD)
318                         acm->iocount.dcd++;
319                 if (difference & ACM_CTRL_FRAMING)
320                         acm->iocount.frame++;
321                 if (difference & ACM_CTRL_PARITY)
322                         acm->iocount.parity++;
323                 if (difference & ACM_CTRL_OVERRUN)
324                         acm->iocount.overrun++;
325                 spin_unlock(&acm->read_lock);
326 
327                 if (difference)
328                         wake_up_all(&acm->wioctl);
329 
330                 break;
331 
332         default:
333                 dev_dbg(&acm->control->dev,
334                         "%s - unknown notification %d received: index %d "
335                         "len %d data0 %d data1 %d\n",
336                         __func__,
337                         dr->bNotificationType, dr->wIndex,
338                         dr->wLength, data[0], data[1]);
339                 break;
340         }
341 exit:
342         retval = usb_submit_urb(urb, GFP_ATOMIC);
343         if (retval)
344                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
345                                                         __func__, retval);
346 }
347 
348 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
349 {
350         int res;
351 
352         if (!test_and_clear_bit(index, &acm->read_urbs_free))
353                 return 0;
354 
355         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
356 
357         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
358         if (res) {
359                 if (res != -EPERM) {
360                         dev_err(&acm->data->dev,
361                                         "%s - usb_submit_urb failed: %d\n",
362                                         __func__, res);
363                 }
364                 set_bit(index, &acm->read_urbs_free);
365                 return res;
366         }
367 
368         return 0;
369 }
370 
371 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
372 {
373         int res;
374         int i;
375 
376         for (i = 0; i < acm->rx_buflimit; ++i) {
377                 res = acm_submit_read_urb(acm, i, mem_flags);
378                 if (res)
379                         return res;
380         }
381 
382         return 0;
383 }
384 
385 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
386 {
387         if (!urb->actual_length)
388                 return;
389 
390         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
391                         urb->actual_length);
392         tty_flip_buffer_push(&acm->port);
393 }
394 
395 static void acm_read_bulk_callback(struct urb *urb)
396 {
397         struct acm_rb *rb = urb->context;
398         struct acm *acm = rb->instance;
399         unsigned long flags;
400 
401         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
402                                         rb->index, urb->actual_length);
403         set_bit(rb->index, &acm->read_urbs_free);
404 
405         if (!acm->dev) {
406                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
407                 return;
408         }
409         usb_mark_last_busy(acm->dev);
410 
411         if (urb->status) {
412                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
413                                                         __func__, urb->status);
414                 return;
415         }
416         acm_process_read_urb(acm, urb);
417 
418         /* throttle device if requested by tty */
419         spin_lock_irqsave(&acm->read_lock, flags);
420         acm->throttled = acm->throttle_req;
421         if (!acm->throttled && !acm->susp_count) {
422                 spin_unlock_irqrestore(&acm->read_lock, flags);
423                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
424         } else {
425                 spin_unlock_irqrestore(&acm->read_lock, flags);
426         }
427 }
428 
429 /* data interface wrote those outgoing bytes */
430 static void acm_write_bulk(struct urb *urb)
431 {
432         struct acm_wb *wb = urb->context;
433         struct acm *acm = wb->instance;
434         unsigned long flags;
435 
436         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
437                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
438                         __func__,
439                         urb->actual_length,
440                         urb->transfer_buffer_length,
441                         urb->status);
442 
443         spin_lock_irqsave(&acm->write_lock, flags);
444         acm_write_done(acm, wb);
445         spin_unlock_irqrestore(&acm->write_lock, flags);
446         schedule_work(&acm->work);
447 }
448 
449 static void acm_softint(struct work_struct *work)
450 {
451         struct acm *acm = container_of(work, struct acm, work);
452 
453         dev_vdbg(&acm->data->dev, "%s\n", __func__);
454 
455         tty_port_tty_wakeup(&acm->port);
456 }
457 
458 /*
459  * TTY handlers
460  */
461 
462 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
463 {
464         struct acm *acm;
465         int retval;
466 
467         dev_dbg(tty->dev, "%s\n", __func__);
468 
469         acm = acm_get_by_index(tty->index);
470         if (!acm)
471                 return -ENODEV;
472 
473         retval = tty_standard_install(driver, tty);
474         if (retval)
475                 goto error_init_termios;
476 
477         tty->driver_data = acm;
478 
479         return 0;
480 
481 error_init_termios:
482         tty_port_put(&acm->port);
483         return retval;
484 }
485 
486 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
487 {
488         struct acm *acm = tty->driver_data;
489 
490         dev_dbg(tty->dev, "%s\n", __func__);
491 
492         return tty_port_open(&acm->port, tty, filp);
493 }
494 
495 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
496 {
497         struct acm *acm = container_of(port, struct acm, port);
498         int retval = -ENODEV;
499 
500         dev_dbg(&acm->control->dev, "%s\n", __func__);
501 
502         mutex_lock(&acm->mutex);
503         if (acm->disconnected)
504                 goto disconnected;
505 
506         retval = usb_autopm_get_interface(acm->control);
507         if (retval)
508                 goto error_get_interface;
509 
510         /*
511          * FIXME: Why do we need this? Allocating 64K of physically contiguous
512          * memory is really nasty...
513          */
514         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
515         acm->control->needs_remote_wakeup = 1;
516 
517         acm->ctrlurb->dev = acm->dev;
518         if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
519                 dev_err(&acm->control->dev,
520                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
521                 usb_autopm_put_interface(acm->control);
522                 goto error_submit_urb;
523         }
524 
525         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
526         if (acm_set_control(acm, acm->ctrlout) < 0 &&
527             (acm->ctrl_caps & USB_CDC_CAP_LINE)) {
528                 usb_autopm_put_interface(acm->control);
529                 goto error_set_control;
530         }
531 
532         usb_autopm_put_interface(acm->control);
533 
534         /*
535          * Unthrottle device in case the TTY was closed while throttled.
536          */
537         spin_lock_irq(&acm->read_lock);
538         acm->throttled = 0;
539         acm->throttle_req = 0;
540         spin_unlock_irq(&acm->read_lock);
541 
542         if (acm_submit_read_urbs(acm, GFP_KERNEL))
543                 goto error_submit_read_urbs;
544 
545         mutex_unlock(&acm->mutex);
546 
547         return 0;
548 
549 error_submit_read_urbs:
550         acm->ctrlout = 0;
551         acm_set_control(acm, acm->ctrlout);
552 error_set_control:
553         usb_kill_urb(acm->ctrlurb);
554 error_submit_urb:
555 error_get_interface:
556 disconnected:
557         mutex_unlock(&acm->mutex);
558         return retval;
559 }
560 
561 static void acm_port_destruct(struct tty_port *port)
562 {
563         struct acm *acm = container_of(port, struct acm, port);
564 
565         dev_dbg(&acm->control->dev, "%s\n", __func__);
566 
567         acm_release_minor(acm);
568         usb_put_intf(acm->control);
569         kfree(acm->country_codes);
570         kfree(acm);
571 }
572 
573 static void acm_port_shutdown(struct tty_port *port)
574 {
575         struct acm *acm = container_of(port, struct acm, port);
576         int i;
577 
578         dev_dbg(&acm->control->dev, "%s\n", __func__);
579 
580         mutex_lock(&acm->mutex);
581         if (!acm->disconnected) {
582                 usb_autopm_get_interface(acm->control);
583                 acm_set_control(acm, acm->ctrlout = 0);
584                 usb_kill_urb(acm->ctrlurb);
585                 for (i = 0; i < ACM_NW; i++)
586                         usb_kill_urb(acm->wb[i].urb);
587                 for (i = 0; i < acm->rx_buflimit; i++)
588                         usb_kill_urb(acm->read_urbs[i]);
589                 acm->control->needs_remote_wakeup = 0;
590                 usb_autopm_put_interface(acm->control);
591         }
592         mutex_unlock(&acm->mutex);
593 }
594 
595 static void acm_tty_cleanup(struct tty_struct *tty)
596 {
597         struct acm *acm = tty->driver_data;
598         dev_dbg(&acm->control->dev, "%s\n", __func__);
599         tty_port_put(&acm->port);
600 }
601 
602 static void acm_tty_hangup(struct tty_struct *tty)
603 {
604         struct acm *acm = tty->driver_data;
605         dev_dbg(&acm->control->dev, "%s\n", __func__);
606         tty_port_hangup(&acm->port);
607 }
608 
609 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
610 {
611         struct acm *acm = tty->driver_data;
612         dev_dbg(&acm->control->dev, "%s\n", __func__);
613         tty_port_close(&acm->port, tty, filp);
614 }
615 
616 static int acm_tty_write(struct tty_struct *tty,
617                                         const unsigned char *buf, int count)
618 {
619         struct acm *acm = tty->driver_data;
620         int stat;
621         unsigned long flags;
622         int wbn;
623         struct acm_wb *wb;
624 
625         if (!count)
626                 return 0;
627 
628         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
629 
630         spin_lock_irqsave(&acm->write_lock, flags);
631         wbn = acm_wb_alloc(acm);
632         if (wbn < 0) {
633                 spin_unlock_irqrestore(&acm->write_lock, flags);
634                 return 0;
635         }
636         wb = &acm->wb[wbn];
637 
638         if (!acm->dev) {
639                 wb->use = 0;
640                 spin_unlock_irqrestore(&acm->write_lock, flags);
641                 return -ENODEV;
642         }
643 
644         count = (count > acm->writesize) ? acm->writesize : count;
645         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
646         memcpy(wb->buf, buf, count);
647         wb->len = count;
648 
649         usb_autopm_get_interface_async(acm->control);
650         if (acm->susp_count) {
651                 if (!acm->delayed_wb)
652                         acm->delayed_wb = wb;
653                 else
654                         usb_autopm_put_interface_async(acm->control);
655                 spin_unlock_irqrestore(&acm->write_lock, flags);
656                 return count;   /* A white lie */
657         }
658         usb_mark_last_busy(acm->dev);
659 
660         stat = acm_start_wb(acm, wb);
661         spin_unlock_irqrestore(&acm->write_lock, flags);
662 
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 wait_serial_change(struct acm *acm, unsigned long arg)
814 {
815         int rv = 0;
816         DECLARE_WAITQUEUE(wait, current);
817         struct async_icount old, new;
818 
819         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
820                 return -EINVAL;
821         do {
822                 spin_lock_irq(&acm->read_lock);
823                 old = acm->oldcount;
824                 new = acm->iocount;
825                 acm->oldcount = new;
826                 spin_unlock_irq(&acm->read_lock);
827 
828                 if ((arg & TIOCM_DSR) &&
829                         old.dsr != new.dsr)
830                         break;
831                 if ((arg & TIOCM_CD)  &&
832                         old.dcd != new.dcd)
833                         break;
834                 if ((arg & TIOCM_RI) &&
835                         old.rng != new.rng)
836                         break;
837 
838                 add_wait_queue(&acm->wioctl, &wait);
839                 set_current_state(TASK_INTERRUPTIBLE);
840                 schedule();
841                 remove_wait_queue(&acm->wioctl, &wait);
842                 if (acm->disconnected) {
843                         if (arg & TIOCM_CD)
844                                 break;
845                         else
846                                 rv = -ENODEV;
847                 } else {
848                         if (signal_pending(current))
849                                 rv = -ERESTARTSYS;
850                 }
851         } while (!rv);
852 
853         
854 
855         return rv;
856 }
857 
858 static int get_serial_usage(struct acm *acm,
859                             struct serial_icounter_struct __user *count)
860 {
861         struct serial_icounter_struct icount;
862         int rv = 0;
863 
864         memset(&icount, 0, sizeof(icount));
865         icount.dsr = acm->iocount.dsr;
866         icount.rng = acm->iocount.rng;
867         icount.dcd = acm->iocount.dcd;
868         icount.frame = acm->iocount.frame;
869         icount.overrun = acm->iocount.overrun;
870         icount.parity = acm->iocount.parity;
871         icount.brk = acm->iocount.brk;
872 
873         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
874                 rv = -EFAULT;
875 
876         return rv;
877 }
878 
879 static int acm_tty_ioctl(struct tty_struct *tty,
880                                         unsigned int cmd, unsigned long arg)
881 {
882         struct acm *acm = tty->driver_data;
883         int rv = -ENOIOCTLCMD;
884 
885         switch (cmd) {
886         case TIOCGSERIAL: /* gets serial port data */
887                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
888                 break;
889         case TIOCSSERIAL:
890                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
891                 break;
892         case TIOCMIWAIT:
893                 rv = usb_autopm_get_interface(acm->control);
894                 if (rv < 0) {
895                         rv = -EIO;
896                         break;
897                 }
898                 rv = wait_serial_change(acm, arg);
899                 usb_autopm_put_interface(acm->control);
900                 break;
901         case TIOCGICOUNT:
902                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
903                 break;
904         }
905 
906         return rv;
907 }
908 
909 static void acm_tty_set_termios(struct tty_struct *tty,
910                                                 struct ktermios *termios_old)
911 {
912         struct acm *acm = tty->driver_data;
913         struct ktermios *termios = &tty->termios;
914         struct usb_cdc_line_coding newline;
915         int newctrl = acm->ctrlout;
916 
917         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
918         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
919         newline.bParityType = termios->c_cflag & PARENB ?
920                                 (termios->c_cflag & PARODD ? 1 : 2) +
921                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
922         switch (termios->c_cflag & CSIZE) {
923         case CS5:
924                 newline.bDataBits = 5;
925                 break;
926         case CS6:
927                 newline.bDataBits = 6;
928                 break;
929         case CS7:
930                 newline.bDataBits = 7;
931                 break;
932         case CS8:
933         default:
934                 newline.bDataBits = 8;
935                 break;
936         }
937         /* FIXME: Needs to clear unsupported bits in the termios */
938         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
939 
940         if (!newline.dwDTERate) {
941                 newline.dwDTERate = acm->line.dwDTERate;
942                 newctrl &= ~ACM_CTRL_DTR;
943         } else
944                 newctrl |=  ACM_CTRL_DTR;
945 
946         if (newctrl != acm->ctrlout)
947                 acm_set_control(acm, acm->ctrlout = newctrl);
948 
949         if (memcmp(&acm->line, &newline, sizeof newline)) {
950                 memcpy(&acm->line, &newline, sizeof newline);
951                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
952                         __func__,
953                         le32_to_cpu(newline.dwDTERate),
954                         newline.bCharFormat, newline.bParityType,
955                         newline.bDataBits);
956                 acm_set_line(acm, &acm->line);
957         }
958 }
959 
960 static const struct tty_port_operations acm_port_ops = {
961         .shutdown = acm_port_shutdown,
962         .activate = acm_port_activate,
963         .destruct = acm_port_destruct,
964 };
965 
966 /*
967  * USB probe and disconnect routines.
968  */
969 
970 /* Little helpers: write/read buffers free */
971 static void acm_write_buffers_free(struct acm *acm)
972 {
973         int i;
974         struct acm_wb *wb;
975         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
976 
977         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
978                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
979 }
980 
981 static void acm_read_buffers_free(struct acm *acm)
982 {
983         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
984         int i;
985 
986         for (i = 0; i < acm->rx_buflimit; i++)
987                 usb_free_coherent(usb_dev, acm->readsize,
988                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
989 }
990 
991 /* Little helper: write buffers allocate */
992 static int acm_write_buffers_alloc(struct acm *acm)
993 {
994         int i;
995         struct acm_wb *wb;
996 
997         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
998                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
999                     &wb->dmah);
1000                 if (!wb->buf) {
1001                         while (i != 0) {
1002                                 --i;
1003                                 --wb;
1004                                 usb_free_coherent(acm->dev, acm->writesize,
1005                                     wb->buf, wb->dmah);
1006                         }
1007                         return -ENOMEM;
1008                 }
1009         }
1010         return 0;
1011 }
1012 
1013 static int acm_probe(struct usb_interface *intf,
1014                      const struct usb_device_id *id)
1015 {
1016         struct usb_cdc_union_desc *union_header = NULL;
1017         struct usb_cdc_country_functional_desc *cfd = NULL;
1018         unsigned char *buffer = intf->altsetting->extra;
1019         int buflen = intf->altsetting->extralen;
1020         struct usb_interface *control_interface;
1021         struct usb_interface *data_interface;
1022         struct usb_endpoint_descriptor *epctrl = NULL;
1023         struct usb_endpoint_descriptor *epread = NULL;
1024         struct usb_endpoint_descriptor *epwrite = NULL;
1025         struct usb_device *usb_dev = interface_to_usbdev(intf);
1026         struct acm *acm;
1027         int minor;
1028         int ctrlsize, readsize;
1029         u8 *buf;
1030         u8 ac_management_function = 0;
1031         u8 call_management_function = 0;
1032         int call_interface_num = -1;
1033         int data_interface_num = -1;
1034         unsigned long quirks;
1035         int num_rx_buf;
1036         int i;
1037         int combined_interfaces = 0;
1038         struct device *tty_dev;
1039         int rv = -ENOMEM;
1040 
1041         /* normal quirks */
1042         quirks = (unsigned long)id->driver_info;
1043 
1044         if (quirks == IGNORE_DEVICE)
1045                 return -ENODEV;
1046 
1047         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1048 
1049         /* handle quirks deadly to normal probing*/
1050         if (quirks == NO_UNION_NORMAL) {
1051                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1052                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1053                 goto skip_normal_probe;
1054         }
1055 
1056         /* normal probing*/
1057         if (!buffer) {
1058                 dev_err(&intf->dev, "Weird descriptor references\n");
1059                 return -EINVAL;
1060         }
1061 
1062         if (!buflen) {
1063                 if (intf->cur_altsetting->endpoint &&
1064                                 intf->cur_altsetting->endpoint->extralen &&
1065                                 intf->cur_altsetting->endpoint->extra) {
1066                         dev_dbg(&intf->dev,
1067                                 "Seeking extra descriptors on endpoint\n");
1068                         buflen = intf->cur_altsetting->endpoint->extralen;
1069                         buffer = intf->cur_altsetting->endpoint->extra;
1070                 } else {
1071                         dev_err(&intf->dev,
1072                                 "Zero length descriptor references\n");
1073                         return -EINVAL;
1074                 }
1075         }
1076 
1077         while (buflen > 0) {
1078                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1079                         dev_err(&intf->dev, "skipping garbage\n");
1080                         goto next_desc;
1081                 }
1082 
1083                 switch (buffer[2]) {
1084                 case USB_CDC_UNION_TYPE: /* we've found it */
1085                         if (union_header) {
1086                                 dev_err(&intf->dev, "More than one "
1087                                         "union descriptor, skipping ...\n");
1088                                 goto next_desc;
1089                         }
1090                         union_header = (struct usb_cdc_union_desc *)buffer;
1091                         break;
1092                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1093                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1094                         break;
1095                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1096                         break; /* for now we ignore it */
1097                 case USB_CDC_ACM_TYPE:
1098                         ac_management_function = buffer[3];
1099                         break;
1100                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1101                         call_management_function = buffer[3];
1102                         call_interface_num = buffer[4];
1103                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1104                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1105                         break;
1106                 default:
1107                         /* there are LOTS more CDC descriptors that
1108                          * could legitimately be found here.
1109                          */
1110                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1111                                         "type %02x, length %d\n",
1112                                         buffer[2], buffer[0]);
1113                         break;
1114                 }
1115 next_desc:
1116                 buflen -= buffer[0];
1117                 buffer += buffer[0];
1118         }
1119 
1120         if (!union_header) {
1121                 if (call_interface_num > 0) {
1122                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1123                         /* quirks for Droids MuIn LCD */
1124                         if (quirks & NO_DATA_INTERFACE)
1125                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1126                         else
1127                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1128                         control_interface = intf;
1129                 } else {
1130                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1131                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1132                                 return -ENODEV;
1133                         } else {
1134                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1135                                 combined_interfaces = 1;
1136                                 control_interface = data_interface = intf;
1137                                 goto look_for_collapsed_interface;
1138                         }
1139                 }
1140         } else {
1141                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1142                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1143                 if (!control_interface || !data_interface) {
1144                         dev_dbg(&intf->dev, "no interfaces\n");
1145                         return -ENODEV;
1146                 }
1147         }
1148 
1149         if (data_interface_num != call_interface_num)
1150                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1151 
1152         if (control_interface == data_interface) {
1153                 /* some broken devices designed for windows work this way */
1154                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1155                 combined_interfaces = 1;
1156                 /* a popular other OS doesn't use it */
1157                 quirks |= NO_CAP_LINE;
1158                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1159                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1160                         return -EINVAL;
1161                 }
1162 look_for_collapsed_interface:
1163                 for (i = 0; i < 3; i++) {
1164                         struct usb_endpoint_descriptor *ep;
1165                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1166 
1167                         if (usb_endpoint_is_int_in(ep))
1168                                 epctrl = ep;
1169                         else if (usb_endpoint_is_bulk_out(ep))
1170                                 epwrite = ep;
1171                         else if (usb_endpoint_is_bulk_in(ep))
1172                                 epread = ep;
1173                         else
1174                                 return -EINVAL;
1175                 }
1176                 if (!epctrl || !epread || !epwrite)
1177                         return -ENODEV;
1178                 else
1179                         goto made_compressed_probe;
1180         }
1181 
1182 skip_normal_probe:
1183 
1184         /*workaround for switched interfaces */
1185         if (data_interface->cur_altsetting->desc.bInterfaceClass
1186                                                 != CDC_DATA_INTERFACE_TYPE) {
1187                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1188                                                 == CDC_DATA_INTERFACE_TYPE) {
1189                         struct usb_interface *t;
1190                         dev_dbg(&intf->dev,
1191                                 "Your device has switched interfaces.\n");
1192                         t = control_interface;
1193                         control_interface = data_interface;
1194                         data_interface = t;
1195                 } else {
1196                         return -EINVAL;
1197                 }
1198         }
1199 
1200         /* Accept probe requests only for the control interface */
1201         if (!combined_interfaces && intf != control_interface)
1202                 return -ENODEV;
1203 
1204         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1205                 /* valid in this context */
1206                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1207                 return -EBUSY;
1208         }
1209 
1210 
1211         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1212             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1213                 return -EINVAL;
1214 
1215         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1216         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1217         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1218 
1219 
1220         /* workaround for switched endpoints */
1221         if (!usb_endpoint_dir_in(epread)) {
1222                 /* descriptors are swapped */
1223                 struct usb_endpoint_descriptor *t;
1224                 dev_dbg(&intf->dev,
1225                         "The data interface has switched endpoints\n");
1226                 t = epread;
1227                 epread = epwrite;
1228                 epwrite = t;
1229         }
1230 made_compressed_probe:
1231         dev_dbg(&intf->dev, "interfaces are valid\n");
1232 
1233         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1234         if (acm == NULL) {
1235                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1236                 goto alloc_fail;
1237         }
1238 
1239         minor = acm_alloc_minor(acm);
1240         if (minor == ACM_TTY_MINORS) {
1241                 dev_err(&intf->dev, "no more free acm devices\n");
1242                 kfree(acm);
1243                 return -ENODEV;
1244         }
1245 
1246         ctrlsize = usb_endpoint_maxp(epctrl);
1247         readsize = usb_endpoint_maxp(epread) *
1248                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1249         acm->combined_interfaces = combined_interfaces;
1250         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1251         acm->control = control_interface;
1252         acm->data = data_interface;
1253         acm->minor = minor;
1254         acm->dev = usb_dev;
1255         acm->ctrl_caps = ac_management_function;
1256         if (quirks & NO_CAP_LINE)
1257                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1258         acm->ctrlsize = ctrlsize;
1259         acm->readsize = readsize;
1260         acm->rx_buflimit = num_rx_buf;
1261         INIT_WORK(&acm->work, acm_softint);
1262         init_waitqueue_head(&acm->wioctl);
1263         spin_lock_init(&acm->write_lock);
1264         spin_lock_init(&acm->read_lock);
1265         mutex_init(&acm->mutex);
1266         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1267         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1268         if (acm->is_int_ep)
1269                 acm->bInterval = epread->bInterval;
1270         tty_port_init(&acm->port);
1271         acm->port.ops = &acm_port_ops;
1272 
1273         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1274         if (!buf) {
1275                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1276                 goto alloc_fail2;
1277         }
1278         acm->ctrl_buffer = buf;
1279 
1280         if (acm_write_buffers_alloc(acm) < 0) {
1281                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1282                 goto alloc_fail4;
1283         }
1284 
1285         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1286         if (!acm->ctrlurb) {
1287                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1288                 goto alloc_fail5;
1289         }
1290         for (i = 0; i < num_rx_buf; i++) {
1291                 struct acm_rb *rb = &(acm->read_buffers[i]);
1292                 struct urb *urb;
1293 
1294                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1295                                                                 &rb->dma);
1296                 if (!rb->base) {
1297                         dev_err(&intf->dev, "out of memory "
1298                                         "(read bufs usb_alloc_coherent)\n");
1299                         goto alloc_fail6;
1300                 }
1301                 rb->index = i;
1302                 rb->instance = acm;
1303 
1304                 urb = usb_alloc_urb(0, GFP_KERNEL);
1305                 if (!urb) {
1306                         dev_err(&intf->dev,
1307                                 "out of memory (read urbs usb_alloc_urb)\n");
1308                         goto alloc_fail6;
1309                 }
1310                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1311                 urb->transfer_dma = rb->dma;
1312                 if (acm->is_int_ep) {
1313                         usb_fill_int_urb(urb, acm->dev,
1314                                          acm->rx_endpoint,
1315                                          rb->base,
1316                                          acm->readsize,
1317                                          acm_read_bulk_callback, rb,
1318                                          acm->bInterval);
1319                 } else {
1320                         usb_fill_bulk_urb(urb, acm->dev,
1321                                           acm->rx_endpoint,
1322                                           rb->base,
1323                                           acm->readsize,
1324                                           acm_read_bulk_callback, rb);
1325                 }
1326 
1327                 acm->read_urbs[i] = urb;
1328                 __set_bit(i, &acm->read_urbs_free);
1329         }
1330         for (i = 0; i < ACM_NW; i++) {
1331                 struct acm_wb *snd = &(acm->wb[i]);
1332 
1333                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1334                 if (snd->urb == NULL) {
1335                         dev_err(&intf->dev,
1336                                 "out of memory (write urbs usb_alloc_urb)\n");
1337                         goto alloc_fail7;
1338                 }
1339 
1340                 if (usb_endpoint_xfer_int(epwrite))
1341                         usb_fill_int_urb(snd->urb, usb_dev,
1342                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1343                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1344                 else
1345                         usb_fill_bulk_urb(snd->urb, usb_dev,
1346                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1347                                 NULL, acm->writesize, acm_write_bulk, snd);
1348                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1349                 snd->instance = acm;
1350         }
1351 
1352         usb_set_intfdata(intf, acm);
1353 
1354         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1355         if (i < 0)
1356                 goto alloc_fail7;
1357 
1358         if (cfd) { /* export the country data */
1359                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1360                 if (!acm->country_codes)
1361                         goto skip_countries;
1362                 acm->country_code_size = cfd->bLength - 4;
1363                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1364                                                         cfd->bLength - 4);
1365                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1366 
1367                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1368                 if (i < 0) {
1369                         kfree(acm->country_codes);
1370                         acm->country_codes = NULL;
1371                         acm->country_code_size = 0;
1372                         goto skip_countries;
1373                 }
1374 
1375                 i = device_create_file(&intf->dev,
1376                                                 &dev_attr_iCountryCodeRelDate);
1377                 if (i < 0) {
1378                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1379                         kfree(acm->country_codes);
1380                         acm->country_codes = NULL;
1381                         acm->country_code_size = 0;
1382                         goto skip_countries;
1383                 }
1384         }
1385 
1386 skip_countries:
1387         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1388                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1389                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1390                          /* works around buggy devices */
1391                          epctrl->bInterval ? epctrl->bInterval : 16);
1392         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1393         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1394 
1395         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1396 
1397         acm_set_control(acm, acm->ctrlout);
1398 
1399         acm->line.dwDTERate = cpu_to_le32(9600);
1400         acm->line.bDataBits = 8;
1401         acm_set_line(acm, &acm->line);
1402 
1403         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1404         usb_set_intfdata(data_interface, acm);
1405 
1406         usb_get_intf(control_interface);
1407         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1408                         &control_interface->dev);
1409         if (IS_ERR(tty_dev)) {
1410                 rv = PTR_ERR(tty_dev);
1411                 goto alloc_fail8;
1412         }
1413 
1414         return 0;
1415 alloc_fail8:
1416         if (acm->country_codes) {
1417                 device_remove_file(&acm->control->dev,
1418                                 &dev_attr_wCountryCodes);
1419                 device_remove_file(&acm->control->dev,
1420                                 &dev_attr_iCountryCodeRelDate);
1421         }
1422         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1423 alloc_fail7:
1424         usb_set_intfdata(intf, NULL);
1425         for (i = 0; i < ACM_NW; i++)
1426                 usb_free_urb(acm->wb[i].urb);
1427 alloc_fail6:
1428         for (i = 0; i < num_rx_buf; i++)
1429                 usb_free_urb(acm->read_urbs[i]);
1430         acm_read_buffers_free(acm);
1431         usb_free_urb(acm->ctrlurb);
1432 alloc_fail5:
1433         acm_write_buffers_free(acm);
1434 alloc_fail4:
1435         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1436 alloc_fail2:
1437         acm_release_minor(acm);
1438         kfree(acm);
1439 alloc_fail:
1440         return rv;
1441 }
1442 
1443 static void stop_data_traffic(struct acm *acm)
1444 {
1445         int i;
1446 
1447         dev_dbg(&acm->control->dev, "%s\n", __func__);
1448 
1449         usb_kill_urb(acm->ctrlurb);
1450         for (i = 0; i < ACM_NW; i++)
1451                 usb_kill_urb(acm->wb[i].urb);
1452         for (i = 0; i < acm->rx_buflimit; i++)
1453                 usb_kill_urb(acm->read_urbs[i]);
1454 
1455         cancel_work_sync(&acm->work);
1456 }
1457 
1458 static void acm_disconnect(struct usb_interface *intf)
1459 {
1460         struct acm *acm = usb_get_intfdata(intf);
1461         struct usb_device *usb_dev = interface_to_usbdev(intf);
1462         struct tty_struct *tty;
1463         int i;
1464 
1465         dev_dbg(&intf->dev, "%s\n", __func__);
1466 
1467         /* sibling interface is already cleaning up */
1468         if (!acm)
1469                 return;
1470 
1471         mutex_lock(&acm->mutex);
1472         acm->disconnected = true;
1473         if (acm->country_codes) {
1474                 device_remove_file(&acm->control->dev,
1475                                 &dev_attr_wCountryCodes);
1476                 device_remove_file(&acm->control->dev,
1477                                 &dev_attr_iCountryCodeRelDate);
1478         }
1479         wake_up_all(&acm->wioctl);
1480         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1481         usb_set_intfdata(acm->control, NULL);
1482         usb_set_intfdata(acm->data, NULL);
1483         mutex_unlock(&acm->mutex);
1484 
1485         tty = tty_port_tty_get(&acm->port);
1486         if (tty) {
1487                 tty_vhangup(tty);
1488                 tty_kref_put(tty);
1489         }
1490 
1491         stop_data_traffic(acm);
1492 
1493         tty_unregister_device(acm_tty_driver, acm->minor);
1494 
1495         usb_free_urb(acm->ctrlurb);
1496         for (i = 0; i < ACM_NW; i++)
1497                 usb_free_urb(acm->wb[i].urb);
1498         for (i = 0; i < acm->rx_buflimit; i++)
1499                 usb_free_urb(acm->read_urbs[i]);
1500         acm_write_buffers_free(acm);
1501         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1502         acm_read_buffers_free(acm);
1503 
1504         if (!acm->combined_interfaces)
1505                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1506                                         acm->data : acm->control);
1507 
1508         tty_port_put(&acm->port);
1509 }
1510 
1511 #ifdef CONFIG_PM
1512 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1513 {
1514         struct acm *acm = usb_get_intfdata(intf);
1515         int cnt;
1516 
1517         if (PMSG_IS_AUTO(message)) {
1518                 int b;
1519 
1520                 spin_lock_irq(&acm->write_lock);
1521                 b = acm->transmitting;
1522                 spin_unlock_irq(&acm->write_lock);
1523                 if (b)
1524                         return -EBUSY;
1525         }
1526 
1527         spin_lock_irq(&acm->read_lock);
1528         spin_lock(&acm->write_lock);
1529         cnt = acm->susp_count++;
1530         spin_unlock(&acm->write_lock);
1531         spin_unlock_irq(&acm->read_lock);
1532 
1533         if (cnt)
1534                 return 0;
1535 
1536         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1537                 stop_data_traffic(acm);
1538 
1539         return 0;
1540 }
1541 
1542 static int acm_resume(struct usb_interface *intf)
1543 {
1544         struct acm *acm = usb_get_intfdata(intf);
1545         struct acm_wb *wb;
1546         int rv = 0;
1547         int cnt;
1548 
1549         spin_lock_irq(&acm->read_lock);
1550         acm->susp_count -= 1;
1551         cnt = acm->susp_count;
1552         spin_unlock_irq(&acm->read_lock);
1553 
1554         if (cnt)
1555                 return 0;
1556 
1557         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1558                 rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1559 
1560                 spin_lock_irq(&acm->write_lock);
1561                 if (acm->delayed_wb) {
1562                         wb = acm->delayed_wb;
1563                         acm->delayed_wb = NULL;
1564                         spin_unlock_irq(&acm->write_lock);
1565                         acm_start_wb(acm, wb);
1566                 } else {
1567                         spin_unlock_irq(&acm->write_lock);
1568                 }
1569 
1570                 /*
1571                  * delayed error checking because we must
1572                  * do the write path at all cost
1573                  */
1574                 if (rv < 0)
1575                         goto err_out;
1576 
1577                 rv = acm_submit_read_urbs(acm, GFP_NOIO);
1578         }
1579 
1580 err_out:
1581         return rv;
1582 }
1583 
1584 static int acm_reset_resume(struct usb_interface *intf)
1585 {
1586         struct acm *acm = usb_get_intfdata(intf);
1587 
1588         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1589                 tty_port_tty_hangup(&acm->port, false);
1590 
1591         return acm_resume(intf);
1592 }
1593 
1594 #endif /* CONFIG_PM */
1595 
1596 #define NOKIA_PCSUITE_ACM_INFO(x) \
1597                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1598                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1599                 USB_CDC_ACM_PROTO_VENDOR)
1600 
1601 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1602                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1603                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1604                 USB_CDC_ACM_PROTO_VENDOR)
1605 
1606 /*
1607  * USB driver structure.
1608  */
1609 
1610 static const struct usb_device_id acm_ids[] = {
1611         /* quirky and broken devices */
1612         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1613         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1614         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1615         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1616         },
1617         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1618         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1619         },
1620         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1621         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1622         },
1623         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1624         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1625         },
1626         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1627         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1628         },
1629         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1630         .driver_info = SINGLE_RX_URB,
1631         },
1632         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1633         .driver_info = SINGLE_RX_URB, /* firmware bug */
1634         },
1635         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1636         .driver_info = SINGLE_RX_URB, /* firmware bug */
1637         },
1638         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1639         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1640         },
1641         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1642         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1643         },
1644         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1645         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1646         },
1647         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1648         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1649         },
1650         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1651         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1652         },
1653         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1654         },
1655         /* Motorola H24 HSPA module: */
1656         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1657         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1658         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1659         },
1660         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1661         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1662         },
1663         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1664         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1665         },
1666         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1667         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1668         },
1669         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1670         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1671         },
1672         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1673         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1674         },
1675         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1676         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1677         },
1678 
1679         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1680         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1681                                            data interface instead of
1682                                            communications interface.
1683                                            Maybe we should define a new
1684                                            quirk for this. */
1685         },
1686         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1687         .driver_info = NO_UNION_NORMAL,
1688         },
1689         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1690         .driver_info = NO_UNION_NORMAL,
1691         },
1692         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1693         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1694         },
1695         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1696         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1697         },
1698 
1699         /* Nokia S60 phones expose two ACM channels. The first is
1700          * a modem and is picked up by the standard AT-command
1701          * information below. The second is 'vendor-specific' but
1702          * is treated as a serial device at the S60 end, so we want
1703          * to expose it on Linux too. */
1704         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1705         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1706         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1707         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1708         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1709         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1710         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1711         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1712         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1713         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1714         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1715         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1716         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1717         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1718         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1719         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1720         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1721         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1722         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1723         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1724         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1725         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1726         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1727         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1728         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1729         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1730         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1731         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1732         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1733         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1734         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1735         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1736         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1737         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1738         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1739         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1740         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1741         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1742         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1743         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1744         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1745         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1746         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1747         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1748         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1749         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1750         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1751         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1752         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1753         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1754         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1755         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1756         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1757         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1758         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1759         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1760         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1761         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1762 
1763         /* Support for Owen devices */
1764         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1765 
1766         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1767 
1768         /* Support Lego NXT using pbLua firmware */
1769         { USB_DEVICE(0x0694, 0xff00),
1770         .driver_info = NOT_A_MODEM,
1771         },
1772 
1773         /* Support for Droids MuIn LCD */
1774         { USB_DEVICE(0x04d8, 0x000b),
1775         .driver_info = NO_DATA_INTERFACE,
1776         },
1777 
1778 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1779         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1780         .driver_info = IGNORE_DEVICE,
1781         },
1782         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1783         .driver_info = IGNORE_DEVICE,
1784         },
1785 #endif
1786 
1787         /* control interfaces without any protocol set */
1788         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1789                 USB_CDC_PROTO_NONE) },
1790 
1791         /* control interfaces with various AT-command sets */
1792         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1793                 USB_CDC_ACM_PROTO_AT_V25TER) },
1794         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1795                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1796         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1797                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1798         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1799                 USB_CDC_ACM_PROTO_AT_GSM) },
1800         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1801                 USB_CDC_ACM_PROTO_AT_3G) },
1802         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1803                 USB_CDC_ACM_PROTO_AT_CDMA) },
1804 
1805         { }
1806 };
1807 
1808 MODULE_DEVICE_TABLE(usb, acm_ids);
1809 
1810 static struct usb_driver acm_driver = {
1811         .name =         "cdc_acm",
1812         .probe =        acm_probe,
1813         .disconnect =   acm_disconnect,
1814 #ifdef CONFIG_PM
1815         .suspend =      acm_suspend,
1816         .resume =       acm_resume,
1817         .reset_resume = acm_reset_resume,
1818 #endif
1819         .id_table =     acm_ids,
1820 #ifdef CONFIG_PM
1821         .supports_autosuspend = 1,
1822 #endif
1823         .disable_hub_initiated_lpm = 1,
1824 };
1825 
1826 /*
1827  * TTY driver structures.
1828  */
1829 
1830 static const struct tty_operations acm_ops = {
1831         .install =              acm_tty_install,
1832         .open =                 acm_tty_open,
1833         .close =                acm_tty_close,
1834         .cleanup =              acm_tty_cleanup,
1835         .hangup =               acm_tty_hangup,
1836         .write =                acm_tty_write,
1837         .write_room =           acm_tty_write_room,
1838         .ioctl =                acm_tty_ioctl,
1839         .throttle =             acm_tty_throttle,
1840         .unthrottle =           acm_tty_unthrottle,
1841         .chars_in_buffer =      acm_tty_chars_in_buffer,
1842         .break_ctl =            acm_tty_break_ctl,
1843         .set_termios =          acm_tty_set_termios,
1844         .tiocmget =             acm_tty_tiocmget,
1845         .tiocmset =             acm_tty_tiocmset,
1846 };
1847 
1848 /*
1849  * Init / exit.
1850  */
1851 
1852 static int __init acm_init(void)
1853 {
1854         int retval;
1855         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1856         if (!acm_tty_driver)
1857                 return -ENOMEM;
1858         acm_tty_driver->driver_name = "acm",
1859         acm_tty_driver->name = "ttyACM",
1860         acm_tty_driver->major = ACM_TTY_MAJOR,
1861         acm_tty_driver->minor_start = 0,
1862         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1863         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1864         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1865         acm_tty_driver->init_termios = tty_std_termios;
1866         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1867                                                                 HUPCL | CLOCAL;
1868         tty_set_operations(acm_tty_driver, &acm_ops);
1869 
1870         retval = tty_register_driver(acm_tty_driver);
1871         if (retval) {
1872                 put_tty_driver(acm_tty_driver);
1873                 return retval;
1874         }
1875 
1876         retval = usb_register(&acm_driver);
1877         if (retval) {
1878                 tty_unregister_driver(acm_tty_driver);
1879                 put_tty_driver(acm_tty_driver);
1880                 return retval;
1881         }
1882 
1883         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1884 
1885         return 0;
1886 }
1887 
1888 static void __exit acm_exit(void)
1889 {
1890         usb_deregister(&acm_driver);
1891         tty_unregister_driver(acm_tty_driver);
1892         put_tty_driver(acm_tty_driver);
1893 }
1894 
1895 module_init(acm_init);
1896 module_exit(acm_exit);
1897 
1898 MODULE_AUTHOR(DRIVER_AUTHOR);
1899 MODULE_DESCRIPTION(DRIVER_DESC);
1900 MODULE_LICENSE("GPL");
1901 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
1902 

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