Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

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/idr.h>
 50 #include <linux/list.h>
 51 
 52 #include "cdc-acm.h"
 53 
 54 
 55 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
 56 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
 57 
 58 static struct usb_driver acm_driver;
 59 static struct tty_driver *acm_tty_driver;
 60 
 61 static DEFINE_IDR(acm_minors);
 62 static DEFINE_MUTEX(acm_minors_lock);
 63 
 64 static void acm_tty_set_termios(struct tty_struct *tty,
 65                                 struct ktermios *termios_old);
 66 
 67 /*
 68  * acm_minors accessors
 69  */
 70 
 71 /*
 72  * Look up an ACM structure by minor. If found and not disconnected, increment
 73  * its refcount and return it with its mutex held.
 74  */
 75 static struct acm *acm_get_by_minor(unsigned int minor)
 76 {
 77         struct acm *acm;
 78 
 79         mutex_lock(&acm_minors_lock);
 80         acm = idr_find(&acm_minors, minor);
 81         if (acm) {
 82                 mutex_lock(&acm->mutex);
 83                 if (acm->disconnected) {
 84                         mutex_unlock(&acm->mutex);
 85                         acm = NULL;
 86                 } else {
 87                         tty_port_get(&acm->port);
 88                         mutex_unlock(&acm->mutex);
 89                 }
 90         }
 91         mutex_unlock(&acm_minors_lock);
 92         return acm;
 93 }
 94 
 95 /*
 96  * Try to find an available minor number and if found, associate it with 'acm'.
 97  */
 98 static int acm_alloc_minor(struct acm *acm)
 99 {
100         int minor;
101 
102         mutex_lock(&acm_minors_lock);
103         minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
104         mutex_unlock(&acm_minors_lock);
105 
106         return minor;
107 }
108 
109 /* Release the minor number associated with 'acm'.  */
110 static void acm_release_minor(struct acm *acm)
111 {
112         mutex_lock(&acm_minors_lock);
113         idr_remove(&acm_minors, acm->minor);
114         mutex_unlock(&acm_minors_lock);
115 }
116 
117 /*
118  * Functions for ACM control messages.
119  */
120 
121 static int acm_ctrl_msg(struct acm *acm, int request, int value,
122                                                         void *buf, int len)
123 {
124         int retval;
125 
126         retval = usb_autopm_get_interface(acm->control);
127         if (retval)
128                 return retval;
129 
130         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
131                 request, USB_RT_ACM, value,
132                 acm->control->altsetting[0].desc.bInterfaceNumber,
133                 buf, len, 5000);
134 
135         dev_dbg(&acm->control->dev,
136                 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
137                 __func__, request, value, len, retval);
138 
139         usb_autopm_put_interface(acm->control);
140 
141         return retval < 0 ? retval : 0;
142 }
143 
144 /* devices aren't required to support these requests.
145  * the cdc acm descriptor tells whether they do...
146  */
147 static inline int acm_set_control(struct acm *acm, int control)
148 {
149         if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
150                 return -EOPNOTSUPP;
151 
152         return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
153                         control, NULL, 0);
154 }
155 
156 #define acm_set_line(acm, line) \
157         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
158 #define acm_send_break(acm, ms) \
159         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
160 
161 static void acm_kill_urbs(struct acm *acm)
162 {
163         int i;
164 
165         usb_kill_urb(acm->ctrlurb);
166         for (i = 0; i < ACM_NW; i++)
167                 usb_kill_urb(acm->wb[i].urb);
168         for (i = 0; i < acm->rx_buflimit; i++)
169                 usb_kill_urb(acm->read_urbs[i]);
170 }
171 
172 /*
173  * Write buffer management.
174  * All of these assume proper locks taken by the caller.
175  */
176 
177 static int acm_wb_alloc(struct acm *acm)
178 {
179         int i, wbn;
180         struct acm_wb *wb;
181 
182         wbn = 0;
183         i = 0;
184         for (;;) {
185                 wb = &acm->wb[wbn];
186                 if (!wb->use) {
187                         wb->use = 1;
188                         return wbn;
189                 }
190                 wbn = (wbn + 1) % ACM_NW;
191                 if (++i >= ACM_NW)
192                         return -1;
193         }
194 }
195 
196 static int acm_wb_is_avail(struct acm *acm)
197 {
198         int i, n;
199         unsigned long flags;
200 
201         n = ACM_NW;
202         spin_lock_irqsave(&acm->write_lock, flags);
203         for (i = 0; i < ACM_NW; i++)
204                 n -= acm->wb[i].use;
205         spin_unlock_irqrestore(&acm->write_lock, flags);
206         return n;
207 }
208 
209 /*
210  * Finish write. Caller must hold acm->write_lock
211  */
212 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
213 {
214         wb->use = 0;
215         acm->transmitting--;
216         usb_autopm_put_interface_async(acm->control);
217 }
218 
219 /*
220  * Poke write.
221  *
222  * the caller is responsible for locking
223  */
224 
225 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
226 {
227         int rc;
228 
229         acm->transmitting++;
230 
231         wb->urb->transfer_buffer = wb->buf;
232         wb->urb->transfer_dma = wb->dmah;
233         wb->urb->transfer_buffer_length = wb->len;
234         wb->urb->dev = acm->dev;
235 
236         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
237         if (rc < 0) {
238                 dev_err(&acm->data->dev,
239                         "%s - usb_submit_urb(write bulk) failed: %d\n",
240                         __func__, rc);
241                 acm_write_done(acm, wb);
242         }
243         return rc;
244 }
245 
246 /*
247  * attributes exported through sysfs
248  */
249 static ssize_t show_caps
250 (struct device *dev, struct device_attribute *attr, char *buf)
251 {
252         struct usb_interface *intf = to_usb_interface(dev);
253         struct acm *acm = usb_get_intfdata(intf);
254 
255         return sprintf(buf, "%d", acm->ctrl_caps);
256 }
257 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
258 
259 static ssize_t show_country_codes
260 (struct device *dev, struct device_attribute *attr, char *buf)
261 {
262         struct usb_interface *intf = to_usb_interface(dev);
263         struct acm *acm = usb_get_intfdata(intf);
264 
265         memcpy(buf, acm->country_codes, acm->country_code_size);
266         return acm->country_code_size;
267 }
268 
269 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
270 
271 static ssize_t show_country_rel_date
272 (struct device *dev, struct device_attribute *attr, char *buf)
273 {
274         struct usb_interface *intf = to_usb_interface(dev);
275         struct acm *acm = usb_get_intfdata(intf);
276 
277         return sprintf(buf, "%d", acm->country_rel_date);
278 }
279 
280 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
281 /*
282  * Interrupt handlers for various ACM device responses
283  */
284 
285 /* control interface reports status changes with "interrupt" transfers */
286 static void acm_ctrl_irq(struct urb *urb)
287 {
288         struct acm *acm = urb->context;
289         struct usb_cdc_notification *dr = urb->transfer_buffer;
290         unsigned char *data;
291         int newctrl;
292         int difference;
293         int retval;
294         int status = urb->status;
295 
296         switch (status) {
297         case 0:
298                 /* success */
299                 break;
300         case -ECONNRESET:
301         case -ENOENT:
302         case -ESHUTDOWN:
303                 /* this urb is terminated, clean up */
304                 dev_dbg(&acm->control->dev,
305                         "%s - urb shutting down with status: %d\n",
306                         __func__, status);
307                 return;
308         default:
309                 dev_dbg(&acm->control->dev,
310                         "%s - nonzero urb status received: %d\n",
311                         __func__, status);
312                 goto exit;
313         }
314 
315         usb_mark_last_busy(acm->dev);
316 
317         data = (unsigned char *)(dr + 1);
318         switch (dr->bNotificationType) {
319         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
320                 dev_dbg(&acm->control->dev,
321                         "%s - network connection: %d\n", __func__, dr->wValue);
322                 break;
323 
324         case USB_CDC_NOTIFY_SERIAL_STATE:
325                 newctrl = get_unaligned_le16(data);
326 
327                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
328                         dev_dbg(&acm->control->dev,
329                                 "%s - calling hangup\n", __func__);
330                         tty_port_tty_hangup(&acm->port, false);
331                 }
332 
333                 difference = acm->ctrlin ^ newctrl;
334                 spin_lock(&acm->read_lock);
335                 acm->ctrlin = newctrl;
336                 acm->oldcount = acm->iocount;
337 
338                 if (difference & ACM_CTRL_DSR)
339                         acm->iocount.dsr++;
340                 if (difference & ACM_CTRL_BRK)
341                         acm->iocount.brk++;
342                 if (difference & ACM_CTRL_RI)
343                         acm->iocount.rng++;
344                 if (difference & ACM_CTRL_DCD)
345                         acm->iocount.dcd++;
346                 if (difference & ACM_CTRL_FRAMING)
347                         acm->iocount.frame++;
348                 if (difference & ACM_CTRL_PARITY)
349                         acm->iocount.parity++;
350                 if (difference & ACM_CTRL_OVERRUN)
351                         acm->iocount.overrun++;
352                 spin_unlock(&acm->read_lock);
353 
354                 if (difference)
355                         wake_up_all(&acm->wioctl);
356 
357                 break;
358 
359         default:
360                 dev_dbg(&acm->control->dev,
361                         "%s - unknown notification %d received: index %d "
362                         "len %d data0 %d data1 %d\n",
363                         __func__,
364                         dr->bNotificationType, dr->wIndex,
365                         dr->wLength, data[0], data[1]);
366                 break;
367         }
368 exit:
369         retval = usb_submit_urb(urb, GFP_ATOMIC);
370         if (retval && retval != -EPERM)
371                 dev_err(&acm->control->dev,
372                         "%s - usb_submit_urb failed: %d\n", __func__, retval);
373 }
374 
375 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
376 {
377         int res;
378 
379         if (!test_and_clear_bit(index, &acm->read_urbs_free))
380                 return 0;
381 
382         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
383         if (res) {
384                 if (res != -EPERM) {
385                         dev_err(&acm->data->dev,
386                                 "urb %d failed submission with %d\n",
387                                 index, res);
388                 }
389                 set_bit(index, &acm->read_urbs_free);
390                 return res;
391         } else {
392                 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
393         }
394 
395         return 0;
396 }
397 
398 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
399 {
400         int res;
401         int i;
402 
403         for (i = 0; i < acm->rx_buflimit; ++i) {
404                 res = acm_submit_read_urb(acm, i, mem_flags);
405                 if (res)
406                         return res;
407         }
408 
409         return 0;
410 }
411 
412 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
413 {
414         if (!urb->actual_length)
415                 return;
416 
417         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
418                         urb->actual_length);
419         tty_flip_buffer_push(&acm->port);
420 }
421 
422 static void acm_read_bulk_callback(struct urb *urb)
423 {
424         struct acm_rb *rb = urb->context;
425         struct acm *acm = rb->instance;
426         unsigned long flags;
427         int status = urb->status;
428 
429         dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
430                 rb->index, urb->actual_length, status);
431 
432         set_bit(rb->index, &acm->read_urbs_free);
433 
434         if (!acm->dev) {
435                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
436                 return;
437         }
438 
439         switch (status) {
440         case 0:
441                 usb_mark_last_busy(acm->dev);
442                 acm_process_read_urb(acm, urb);
443                 break;
444         case -EPIPE:
445                 set_bit(EVENT_RX_STALL, &acm->flags);
446                 schedule_work(&acm->work);
447                 return;
448         case -ENOENT:
449         case -ECONNRESET:
450         case -ESHUTDOWN:
451                 dev_dbg(&acm->data->dev,
452                         "%s - urb shutting down with status: %d\n",
453                         __func__, status);
454                 return;
455         default:
456                 dev_dbg(&acm->data->dev,
457                         "%s - nonzero urb status received: %d\n",
458                         __func__, status);
459                 break;
460         }
461 
462         /*
463          * Unthrottle may run on another CPU which needs to see events
464          * in the same order. Submission has an implict barrier
465          */
466         smp_mb__before_atomic();
467 
468         /* throttle device if requested by tty */
469         spin_lock_irqsave(&acm->read_lock, flags);
470         acm->throttled = acm->throttle_req;
471         if (!acm->throttled) {
472                 spin_unlock_irqrestore(&acm->read_lock, flags);
473                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
474         } else {
475                 spin_unlock_irqrestore(&acm->read_lock, flags);
476         }
477 }
478 
479 /* data interface wrote those outgoing bytes */
480 static void acm_write_bulk(struct urb *urb)
481 {
482         struct acm_wb *wb = urb->context;
483         struct acm *acm = wb->instance;
484         unsigned long flags;
485         int status = urb->status;
486 
487         if (status || (urb->actual_length != urb->transfer_buffer_length))
488                 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
489                         urb->actual_length,
490                         urb->transfer_buffer_length,
491                         status);
492 
493         spin_lock_irqsave(&acm->write_lock, flags);
494         acm_write_done(acm, wb);
495         spin_unlock_irqrestore(&acm->write_lock, flags);
496         set_bit(EVENT_TTY_WAKEUP, &acm->flags);
497         schedule_work(&acm->work);
498 }
499 
500 static void acm_softint(struct work_struct *work)
501 {
502         int i;
503         struct acm *acm = container_of(work, struct acm, work);
504 
505         if (test_bit(EVENT_RX_STALL, &acm->flags)) {
506                 if (!(usb_autopm_get_interface(acm->data))) {
507                         for (i = 0; i < acm->rx_buflimit; i++)
508                                 usb_kill_urb(acm->read_urbs[i]);
509                         usb_clear_halt(acm->dev, acm->in);
510                         acm_submit_read_urbs(acm, GFP_KERNEL);
511                         usb_autopm_put_interface(acm->data);
512                 }
513                 clear_bit(EVENT_RX_STALL, &acm->flags);
514         }
515 
516         if (test_bit(EVENT_TTY_WAKEUP, &acm->flags)) {
517                 tty_port_tty_wakeup(&acm->port);
518                 clear_bit(EVENT_TTY_WAKEUP, &acm->flags);
519         }
520 }
521 
522 /*
523  * TTY handlers
524  */
525 
526 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
527 {
528         struct acm *acm;
529         int retval;
530 
531         acm = acm_get_by_minor(tty->index);
532         if (!acm)
533                 return -ENODEV;
534 
535         retval = tty_standard_install(driver, tty);
536         if (retval)
537                 goto error_init_termios;
538 
539         tty->driver_data = acm;
540 
541         return 0;
542 
543 error_init_termios:
544         tty_port_put(&acm->port);
545         return retval;
546 }
547 
548 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
549 {
550         struct acm *acm = tty->driver_data;
551 
552         return tty_port_open(&acm->port, tty, filp);
553 }
554 
555 static void acm_port_dtr_rts(struct tty_port *port, int raise)
556 {
557         struct acm *acm = container_of(port, struct acm, port);
558         int val;
559         int res;
560 
561         if (raise)
562                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
563         else
564                 val = 0;
565 
566         /* FIXME: add missing ctrlout locking throughout driver */
567         acm->ctrlout = val;
568 
569         res = acm_set_control(acm, val);
570         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
571                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
572 }
573 
574 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
575 {
576         struct acm *acm = container_of(port, struct acm, port);
577         int retval = -ENODEV;
578         int i;
579 
580         mutex_lock(&acm->mutex);
581         if (acm->disconnected)
582                 goto disconnected;
583 
584         retval = usb_autopm_get_interface(acm->control);
585         if (retval)
586                 goto error_get_interface;
587 
588         /*
589          * FIXME: Why do we need this? Allocating 64K of physically contiguous
590          * memory is really nasty...
591          */
592         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
593         acm->control->needs_remote_wakeup = 1;
594 
595         acm->ctrlurb->dev = acm->dev;
596         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
597         if (retval) {
598                 dev_err(&acm->control->dev,
599                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
600                 goto error_submit_urb;
601         }
602 
603         acm_tty_set_termios(tty, NULL);
604 
605         /*
606          * Unthrottle device in case the TTY was closed while throttled.
607          */
608         spin_lock_irq(&acm->read_lock);
609         acm->throttled = 0;
610         acm->throttle_req = 0;
611         spin_unlock_irq(&acm->read_lock);
612 
613         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
614         if (retval)
615                 goto error_submit_read_urbs;
616 
617         usb_autopm_put_interface(acm->control);
618 
619         mutex_unlock(&acm->mutex);
620 
621         return 0;
622 
623 error_submit_read_urbs:
624         for (i = 0; i < acm->rx_buflimit; i++)
625                 usb_kill_urb(acm->read_urbs[i]);
626         usb_kill_urb(acm->ctrlurb);
627 error_submit_urb:
628         usb_autopm_put_interface(acm->control);
629 error_get_interface:
630 disconnected:
631         mutex_unlock(&acm->mutex);
632 
633         return usb_translate_errors(retval);
634 }
635 
636 static void acm_port_destruct(struct tty_port *port)
637 {
638         struct acm *acm = container_of(port, struct acm, port);
639 
640         acm_release_minor(acm);
641         usb_put_intf(acm->control);
642         kfree(acm->country_codes);
643         kfree(acm);
644 }
645 
646 static void acm_port_shutdown(struct tty_port *port)
647 {
648         struct acm *acm = container_of(port, struct acm, port);
649         struct urb *urb;
650         struct acm_wb *wb;
651 
652         /*
653          * Need to grab write_lock to prevent race with resume, but no need to
654          * hold it due to the tty-port initialised flag.
655          */
656         spin_lock_irq(&acm->write_lock);
657         spin_unlock_irq(&acm->write_lock);
658 
659         usb_autopm_get_interface_no_resume(acm->control);
660         acm->control->needs_remote_wakeup = 0;
661         usb_autopm_put_interface(acm->control);
662 
663         for (;;) {
664                 urb = usb_get_from_anchor(&acm->delayed);
665                 if (!urb)
666                         break;
667                 wb = urb->context;
668                 wb->use = 0;
669                 usb_autopm_put_interface_async(acm->control);
670         }
671 
672         acm_kill_urbs(acm);
673 }
674 
675 static void acm_tty_cleanup(struct tty_struct *tty)
676 {
677         struct acm *acm = tty->driver_data;
678 
679         tty_port_put(&acm->port);
680 }
681 
682 static void acm_tty_hangup(struct tty_struct *tty)
683 {
684         struct acm *acm = tty->driver_data;
685 
686         tty_port_hangup(&acm->port);
687 }
688 
689 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
690 {
691         struct acm *acm = tty->driver_data;
692 
693         tty_port_close(&acm->port, tty, filp);
694 }
695 
696 static int acm_tty_write(struct tty_struct *tty,
697                                         const unsigned char *buf, int count)
698 {
699         struct acm *acm = tty->driver_data;
700         int stat;
701         unsigned long flags;
702         int wbn;
703         struct acm_wb *wb;
704 
705         if (!count)
706                 return 0;
707 
708         dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
709 
710         spin_lock_irqsave(&acm->write_lock, flags);
711         wbn = acm_wb_alloc(acm);
712         if (wbn < 0) {
713                 spin_unlock_irqrestore(&acm->write_lock, flags);
714                 return 0;
715         }
716         wb = &acm->wb[wbn];
717 
718         if (!acm->dev) {
719                 wb->use = 0;
720                 spin_unlock_irqrestore(&acm->write_lock, flags);
721                 return -ENODEV;
722         }
723 
724         count = (count > acm->writesize) ? acm->writesize : count;
725         dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
726         memcpy(wb->buf, buf, count);
727         wb->len = count;
728 
729         stat = usb_autopm_get_interface_async(acm->control);
730         if (stat) {
731                 wb->use = 0;
732                 spin_unlock_irqrestore(&acm->write_lock, flags);
733                 return stat;
734         }
735 
736         if (acm->susp_count) {
737                 if (acm->putbuffer) {
738                         /* now to preserve order */
739                         usb_anchor_urb(acm->putbuffer->urb, &acm->delayed);
740                         acm->putbuffer = NULL;
741                 }
742                 usb_anchor_urb(wb->urb, &acm->delayed);
743                 spin_unlock_irqrestore(&acm->write_lock, flags);
744                 return count;
745         } else {
746                 if (acm->putbuffer) {
747                         /* at this point there is no good way to handle errors */
748                         acm_start_wb(acm, acm->putbuffer);
749                         acm->putbuffer = NULL;
750                 }
751         }
752 
753         stat = acm_start_wb(acm, wb);
754         spin_unlock_irqrestore(&acm->write_lock, flags);
755 
756         if (stat < 0)
757                 return stat;
758         return count;
759 }
760 
761 static void acm_tty_flush_chars(struct tty_struct *tty)
762 {
763         struct acm *acm = tty->driver_data;
764         struct acm_wb *cur = acm->putbuffer;
765         int err;
766         unsigned long flags;
767 
768         if (!cur) /* nothing to do */
769                 return;
770 
771         acm->putbuffer = NULL;
772         err = usb_autopm_get_interface_async(acm->control);
773         spin_lock_irqsave(&acm->write_lock, flags);
774         if (err < 0) {
775                 cur->use = 0;
776                 acm->putbuffer = cur;
777                 goto out;
778         }
779 
780         if (acm->susp_count)
781                 usb_anchor_urb(cur->urb, &acm->delayed);
782         else
783                 acm_start_wb(acm, cur);
784 out:
785         spin_unlock_irqrestore(&acm->write_lock, flags);
786         return;
787 }
788 
789 static int acm_tty_put_char(struct tty_struct *tty, unsigned char ch)
790 {
791         struct acm *acm = tty->driver_data;
792         struct acm_wb *cur;
793         int wbn;
794         unsigned long flags;
795 
796 overflow:
797         cur = acm->putbuffer;
798         if (!cur) {
799                 spin_lock_irqsave(&acm->write_lock, flags);
800                 wbn = acm_wb_alloc(acm);
801                 if (wbn >= 0) {
802                         cur = &acm->wb[wbn];
803                         acm->putbuffer = cur;
804                 }
805                 spin_unlock_irqrestore(&acm->write_lock, flags);
806                 if (!cur)
807                         return 0;
808         }
809 
810         if (cur->len == acm->writesize) {
811                 acm_tty_flush_chars(tty);
812                 goto overflow;
813         }
814 
815         cur->buf[cur->len++] = ch;
816         return 1;
817 }
818 
819 static int acm_tty_write_room(struct tty_struct *tty)
820 {
821         struct acm *acm = tty->driver_data;
822         /*
823          * Do not let the line discipline to know that we have a reserve,
824          * or it might get too enthusiastic.
825          */
826         return acm_wb_is_avail(acm) ? acm->writesize : 0;
827 }
828 
829 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
830 {
831         struct acm *acm = tty->driver_data;
832         /*
833          * if the device was unplugged then any remaining characters fell out
834          * of the connector ;)
835          */
836         if (acm->disconnected)
837                 return 0;
838         /*
839          * This is inaccurate (overcounts), but it works.
840          */
841         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
842 }
843 
844 static void acm_tty_throttle(struct tty_struct *tty)
845 {
846         struct acm *acm = tty->driver_data;
847 
848         spin_lock_irq(&acm->read_lock);
849         acm->throttle_req = 1;
850         spin_unlock_irq(&acm->read_lock);
851 }
852 
853 static void acm_tty_unthrottle(struct tty_struct *tty)
854 {
855         struct acm *acm = tty->driver_data;
856         unsigned int was_throttled;
857 
858         spin_lock_irq(&acm->read_lock);
859         was_throttled = acm->throttled;
860         acm->throttled = 0;
861         acm->throttle_req = 0;
862         spin_unlock_irq(&acm->read_lock);
863 
864         if (was_throttled)
865                 acm_submit_read_urbs(acm, GFP_KERNEL);
866 }
867 
868 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
869 {
870         struct acm *acm = tty->driver_data;
871         int retval;
872 
873         retval = acm_send_break(acm, state ? 0xffff : 0);
874         if (retval < 0)
875                 dev_dbg(&acm->control->dev,
876                         "%s - send break failed\n", __func__);
877         return retval;
878 }
879 
880 static int acm_tty_tiocmget(struct tty_struct *tty)
881 {
882         struct acm *acm = tty->driver_data;
883 
884         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
885                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
886                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
887                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
888                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
889                TIOCM_CTS;
890 }
891 
892 static int acm_tty_tiocmset(struct tty_struct *tty,
893                             unsigned int set, unsigned int clear)
894 {
895         struct acm *acm = tty->driver_data;
896         unsigned int newctrl;
897 
898         newctrl = acm->ctrlout;
899         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
900                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
901         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
902                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
903 
904         newctrl = (newctrl & ~clear) | set;
905 
906         if (acm->ctrlout == newctrl)
907                 return 0;
908         return acm_set_control(acm, acm->ctrlout = newctrl);
909 }
910 
911 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
912 {
913         struct serial_struct tmp;
914 
915         memset(&tmp, 0, sizeof(tmp));
916         tmp.flags = ASYNC_LOW_LATENCY;
917         tmp.xmit_fifo_size = acm->writesize;
918         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
919         tmp.close_delay = acm->port.close_delay / 10;
920         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
921                                 ASYNC_CLOSING_WAIT_NONE :
922                                 acm->port.closing_wait / 10;
923 
924         if (copy_to_user(info, &tmp, sizeof(tmp)))
925                 return -EFAULT;
926         else
927                 return 0;
928 }
929 
930 static int set_serial_info(struct acm *acm,
931                                 struct serial_struct __user *newinfo)
932 {
933         struct serial_struct new_serial;
934         unsigned int closing_wait, close_delay;
935         int retval = 0;
936 
937         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
938                 return -EFAULT;
939 
940         close_delay = new_serial.close_delay * 10;
941         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
942                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
943 
944         mutex_lock(&acm->port.mutex);
945 
946         if (!capable(CAP_SYS_ADMIN)) {
947                 if ((close_delay != acm->port.close_delay) ||
948                     (closing_wait != acm->port.closing_wait))
949                         retval = -EPERM;
950                 else
951                         retval = -EOPNOTSUPP;
952         } else {
953                 acm->port.close_delay  = close_delay;
954                 acm->port.closing_wait = closing_wait;
955         }
956 
957         mutex_unlock(&acm->port.mutex);
958         return retval;
959 }
960 
961 static int wait_serial_change(struct acm *acm, unsigned long arg)
962 {
963         int rv = 0;
964         DECLARE_WAITQUEUE(wait, current);
965         struct async_icount old, new;
966 
967         do {
968                 spin_lock_irq(&acm->read_lock);
969                 old = acm->oldcount;
970                 new = acm->iocount;
971                 acm->oldcount = new;
972                 spin_unlock_irq(&acm->read_lock);
973 
974                 if ((arg & TIOCM_DSR) &&
975                         old.dsr != new.dsr)
976                         break;
977                 if ((arg & TIOCM_CD)  &&
978                         old.dcd != new.dcd)
979                         break;
980                 if ((arg & TIOCM_RI) &&
981                         old.rng != new.rng)
982                         break;
983 
984                 add_wait_queue(&acm->wioctl, &wait);
985                 set_current_state(TASK_INTERRUPTIBLE);
986                 schedule();
987                 remove_wait_queue(&acm->wioctl, &wait);
988                 if (acm->disconnected) {
989                         if (arg & TIOCM_CD)
990                                 break;
991                         else
992                                 rv = -ENODEV;
993                 } else {
994                         if (signal_pending(current))
995                                 rv = -ERESTARTSYS;
996                 }
997         } while (!rv);
998 
999         
1000 
1001         return rv;
1002 }
1003 
1004 static int acm_tty_get_icount(struct tty_struct *tty,
1005                                         struct serial_icounter_struct *icount)
1006 {
1007         struct acm *acm = tty->driver_data;
1008 
1009         icount->dsr = acm->iocount.dsr;
1010         icount->rng = acm->iocount.rng;
1011         icount->dcd = acm->iocount.dcd;
1012         icount->frame = acm->iocount.frame;
1013         icount->overrun = acm->iocount.overrun;
1014         icount->parity = acm->iocount.parity;
1015         icount->brk = acm->iocount.brk;
1016 
1017         return 0;
1018 }
1019 
1020 static int acm_tty_ioctl(struct tty_struct *tty,
1021                                         unsigned int cmd, unsigned long arg)
1022 {
1023         struct acm *acm = tty->driver_data;
1024         int rv = -ENOIOCTLCMD;
1025 
1026         switch (cmd) {
1027         case TIOCGSERIAL: /* gets serial port data */
1028                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
1029                 break;
1030         case TIOCSSERIAL:
1031                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
1032                 break;
1033         case TIOCMIWAIT:
1034                 rv = usb_autopm_get_interface(acm->control);
1035                 if (rv < 0) {
1036                         rv = -EIO;
1037                         break;
1038                 }
1039                 rv = wait_serial_change(acm, arg);
1040                 usb_autopm_put_interface(acm->control);
1041                 break;
1042         }
1043 
1044         return rv;
1045 }
1046 
1047 static void acm_tty_set_termios(struct tty_struct *tty,
1048                                                 struct ktermios *termios_old)
1049 {
1050         struct acm *acm = tty->driver_data;
1051         struct ktermios *termios = &tty->termios;
1052         struct usb_cdc_line_coding newline;
1053         int newctrl = acm->ctrlout;
1054 
1055         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1056         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1057         newline.bParityType = termios->c_cflag & PARENB ?
1058                                 (termios->c_cflag & PARODD ? 1 : 2) +
1059                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1060         switch (termios->c_cflag & CSIZE) {
1061         case CS5:
1062                 newline.bDataBits = 5;
1063                 break;
1064         case CS6:
1065                 newline.bDataBits = 6;
1066                 break;
1067         case CS7:
1068                 newline.bDataBits = 7;
1069                 break;
1070         case CS8:
1071         default:
1072                 newline.bDataBits = 8;
1073                 break;
1074         }
1075         /* FIXME: Needs to clear unsupported bits in the termios */
1076         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1077 
1078         if (C_BAUD(tty) == B0) {
1079                 newline.dwDTERate = acm->line.dwDTERate;
1080                 newctrl &= ~ACM_CTRL_DTR;
1081         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1082                 newctrl |=  ACM_CTRL_DTR;
1083         }
1084 
1085         if (newctrl != acm->ctrlout)
1086                 acm_set_control(acm, acm->ctrlout = newctrl);
1087 
1088         if (memcmp(&acm->line, &newline, sizeof newline)) {
1089                 memcpy(&acm->line, &newline, sizeof newline);
1090                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1091                         __func__,
1092                         le32_to_cpu(newline.dwDTERate),
1093                         newline.bCharFormat, newline.bParityType,
1094                         newline.bDataBits);
1095                 acm_set_line(acm, &acm->line);
1096         }
1097 }
1098 
1099 static const struct tty_port_operations acm_port_ops = {
1100         .dtr_rts = acm_port_dtr_rts,
1101         .shutdown = acm_port_shutdown,
1102         .activate = acm_port_activate,
1103         .destruct = acm_port_destruct,
1104 };
1105 
1106 /*
1107  * USB probe and disconnect routines.
1108  */
1109 
1110 /* Little helpers: write/read buffers free */
1111 static void acm_write_buffers_free(struct acm *acm)
1112 {
1113         int i;
1114         struct acm_wb *wb;
1115 
1116         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1117                 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1118 }
1119 
1120 static void acm_read_buffers_free(struct acm *acm)
1121 {
1122         int i;
1123 
1124         for (i = 0; i < acm->rx_buflimit; i++)
1125                 usb_free_coherent(acm->dev, acm->readsize,
1126                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1127 }
1128 
1129 /* Little helper: write buffers allocate */
1130 static int acm_write_buffers_alloc(struct acm *acm)
1131 {
1132         int i;
1133         struct acm_wb *wb;
1134 
1135         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1136                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1137                     &wb->dmah);
1138                 if (!wb->buf) {
1139                         while (i != 0) {
1140                                 --i;
1141                                 --wb;
1142                                 usb_free_coherent(acm->dev, acm->writesize,
1143                                     wb->buf, wb->dmah);
1144                         }
1145                         return -ENOMEM;
1146                 }
1147         }
1148         return 0;
1149 }
1150 
1151 static int acm_probe(struct usb_interface *intf,
1152                      const struct usb_device_id *id)
1153 {
1154         struct usb_cdc_union_desc *union_header = NULL;
1155         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1156         unsigned char *buffer = intf->altsetting->extra;
1157         int buflen = intf->altsetting->extralen;
1158         struct usb_interface *control_interface;
1159         struct usb_interface *data_interface;
1160         struct usb_endpoint_descriptor *epctrl = NULL;
1161         struct usb_endpoint_descriptor *epread = NULL;
1162         struct usb_endpoint_descriptor *epwrite = NULL;
1163         struct usb_device *usb_dev = interface_to_usbdev(intf);
1164         struct usb_cdc_parsed_header h;
1165         struct acm *acm;
1166         int minor;
1167         int ctrlsize, readsize;
1168         u8 *buf;
1169         int call_intf_num = -1;
1170         int data_intf_num = -1;
1171         unsigned long quirks;
1172         int num_rx_buf;
1173         int i;
1174         int combined_interfaces = 0;
1175         struct device *tty_dev;
1176         int rv = -ENOMEM;
1177 
1178         /* normal quirks */
1179         quirks = (unsigned long)id->driver_info;
1180 
1181         if (quirks == IGNORE_DEVICE)
1182                 return -ENODEV;
1183 
1184         memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1185 
1186         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1187 
1188         /* handle quirks deadly to normal probing*/
1189         if (quirks == NO_UNION_NORMAL) {
1190                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1191                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1192                 /* we would crash */
1193                 if (!data_interface || !control_interface)
1194                         return -ENODEV;
1195                 goto skip_normal_probe;
1196         }
1197 
1198         /* normal probing*/
1199         if (!buffer) {
1200                 dev_err(&intf->dev, "Weird descriptor references\n");
1201                 return -EINVAL;
1202         }
1203 
1204         if (!intf->cur_altsetting)
1205                 return -EINVAL;
1206 
1207         if (!buflen) {
1208                 if (intf->cur_altsetting->endpoint &&
1209                                 intf->cur_altsetting->endpoint->extralen &&
1210                                 intf->cur_altsetting->endpoint->extra) {
1211                         dev_dbg(&intf->dev,
1212                                 "Seeking extra descriptors on endpoint\n");
1213                         buflen = intf->cur_altsetting->endpoint->extralen;
1214                         buffer = intf->cur_altsetting->endpoint->extra;
1215                 } else {
1216                         dev_err(&intf->dev,
1217                                 "Zero length descriptor references\n");
1218                         return -EINVAL;
1219                 }
1220         }
1221 
1222         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1223         union_header = h.usb_cdc_union_desc;
1224         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1225         if (cmgmd)
1226                 call_intf_num = cmgmd->bDataInterface;
1227 
1228         if (!union_header) {
1229                 if (call_intf_num > 0) {
1230                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1231                         /* quirks for Droids MuIn LCD */
1232                         if (quirks & NO_DATA_INTERFACE) {
1233                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1234                         } else {
1235                                 data_intf_num = call_intf_num;
1236                                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1237                         }
1238                         control_interface = intf;
1239                 } else {
1240                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1241                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1242                                 return -ENODEV;
1243                         } else {
1244                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1245                                 combined_interfaces = 1;
1246                                 control_interface = data_interface = intf;
1247                                 goto look_for_collapsed_interface;
1248                         }
1249                 }
1250         } else {
1251                 data_intf_num = union_header->bSlaveInterface0;
1252                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1253                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1254         }
1255 
1256         if (!control_interface || !data_interface) {
1257                 dev_dbg(&intf->dev, "no interfaces\n");
1258                 return -ENODEV;
1259         }
1260         if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1261                 return -ENODEV;
1262 
1263         if (data_intf_num != call_intf_num)
1264                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1265 
1266         if (control_interface == data_interface) {
1267                 /* some broken devices designed for windows work this way */
1268                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1269                 combined_interfaces = 1;
1270                 /* a popular other OS doesn't use it */
1271                 quirks |= NO_CAP_LINE;
1272                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1273                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1274                         return -EINVAL;
1275                 }
1276 look_for_collapsed_interface:
1277                 for (i = 0; i < 3; i++) {
1278                         struct usb_endpoint_descriptor *ep;
1279                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1280 
1281                         if (usb_endpoint_is_int_in(ep))
1282                                 epctrl = ep;
1283                         else if (usb_endpoint_is_bulk_out(ep))
1284                                 epwrite = ep;
1285                         else if (usb_endpoint_is_bulk_in(ep))
1286                                 epread = ep;
1287                         else
1288                                 return -EINVAL;
1289                 }
1290                 if (!epctrl || !epread || !epwrite)
1291                         return -ENODEV;
1292                 else
1293                         goto made_compressed_probe;
1294         }
1295 
1296 skip_normal_probe:
1297 
1298         /*workaround for switched interfaces */
1299         if (data_interface->cur_altsetting->desc.bInterfaceClass
1300                                                 != CDC_DATA_INTERFACE_TYPE) {
1301                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1302                                                 == CDC_DATA_INTERFACE_TYPE) {
1303                         dev_dbg(&intf->dev,
1304                                 "Your device has switched interfaces.\n");
1305                         swap(control_interface, data_interface);
1306                 } else {
1307                         return -EINVAL;
1308                 }
1309         }
1310 
1311         /* Accept probe requests only for the control interface */
1312         if (!combined_interfaces && intf != control_interface)
1313                 return -ENODEV;
1314 
1315         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1316                 /* valid in this context */
1317                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1318                 return -EBUSY;
1319         }
1320 
1321 
1322         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1323             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1324                 return -EINVAL;
1325 
1326         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1327         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1328         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1329 
1330 
1331         /* workaround for switched endpoints */
1332         if (!usb_endpoint_dir_in(epread)) {
1333                 /* descriptors are swapped */
1334                 dev_dbg(&intf->dev,
1335                         "The data interface has switched endpoints\n");
1336                 swap(epread, epwrite);
1337         }
1338 made_compressed_probe:
1339         dev_dbg(&intf->dev, "interfaces are valid\n");
1340 
1341         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1342         if (acm == NULL)
1343                 goto alloc_fail;
1344 
1345         minor = acm_alloc_minor(acm);
1346         if (minor < 0)
1347                 goto alloc_fail1;
1348 
1349         ctrlsize = usb_endpoint_maxp(epctrl);
1350         readsize = usb_endpoint_maxp(epread) *
1351                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1352         acm->combined_interfaces = combined_interfaces;
1353         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1354         acm->control = control_interface;
1355         acm->data = data_interface;
1356         acm->minor = minor;
1357         acm->dev = usb_dev;
1358         if (h.usb_cdc_acm_descriptor)
1359                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1360         if (quirks & NO_CAP_LINE)
1361                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1362         acm->ctrlsize = ctrlsize;
1363         acm->readsize = readsize;
1364         acm->rx_buflimit = num_rx_buf;
1365         INIT_WORK(&acm->work, acm_softint);
1366         init_waitqueue_head(&acm->wioctl);
1367         spin_lock_init(&acm->write_lock);
1368         spin_lock_init(&acm->read_lock);
1369         mutex_init(&acm->mutex);
1370         if (usb_endpoint_xfer_int(epread)) {
1371                 acm->bInterval = epread->bInterval;
1372                 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1373         } else {
1374                 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1375         }
1376         if (usb_endpoint_xfer_int(epwrite))
1377                 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1378         else
1379                 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1380         tty_port_init(&acm->port);
1381         acm->port.ops = &acm_port_ops;
1382         init_usb_anchor(&acm->delayed);
1383         acm->quirks = quirks;
1384 
1385         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1386         if (!buf)
1387                 goto alloc_fail2;
1388         acm->ctrl_buffer = buf;
1389 
1390         if (acm_write_buffers_alloc(acm) < 0)
1391                 goto alloc_fail4;
1392 
1393         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1394         if (!acm->ctrlurb)
1395                 goto alloc_fail5;
1396 
1397         for (i = 0; i < num_rx_buf; i++) {
1398                 struct acm_rb *rb = &(acm->read_buffers[i]);
1399                 struct urb *urb;
1400 
1401                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1402                                                                 &rb->dma);
1403                 if (!rb->base)
1404                         goto alloc_fail6;
1405                 rb->index = i;
1406                 rb->instance = acm;
1407 
1408                 urb = usb_alloc_urb(0, GFP_KERNEL);
1409                 if (!urb)
1410                         goto alloc_fail6;
1411 
1412                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1413                 urb->transfer_dma = rb->dma;
1414                 if (usb_endpoint_xfer_int(epread))
1415                         usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1416                                          acm->readsize,
1417                                          acm_read_bulk_callback, rb,
1418                                          acm->bInterval);
1419                 else
1420                         usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1421                                           acm->readsize,
1422                                           acm_read_bulk_callback, rb);
1423 
1424                 acm->read_urbs[i] = urb;
1425                 __set_bit(i, &acm->read_urbs_free);
1426         }
1427         for (i = 0; i < ACM_NW; i++) {
1428                 struct acm_wb *snd = &(acm->wb[i]);
1429 
1430                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1431                 if (snd->urb == NULL)
1432                         goto alloc_fail7;
1433 
1434                 if (usb_endpoint_xfer_int(epwrite))
1435                         usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1436                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1437                 else
1438                         usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1439                                 NULL, acm->writesize, acm_write_bulk, snd);
1440                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1441                 if (quirks & SEND_ZERO_PACKET)
1442                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1443                 snd->instance = acm;
1444         }
1445 
1446         usb_set_intfdata(intf, acm);
1447 
1448         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1449         if (i < 0)
1450                 goto alloc_fail7;
1451 
1452         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1453                 struct usb_cdc_country_functional_desc * cfd =
1454                                         h.usb_cdc_country_functional_desc;
1455 
1456                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1457                 if (!acm->country_codes)
1458                         goto skip_countries;
1459                 acm->country_code_size = cfd->bLength - 4;
1460                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1461                                                         cfd->bLength - 4);
1462                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1463 
1464                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1465                 if (i < 0) {
1466                         kfree(acm->country_codes);
1467                         acm->country_codes = NULL;
1468                         acm->country_code_size = 0;
1469                         goto skip_countries;
1470                 }
1471 
1472                 i = device_create_file(&intf->dev,
1473                                                 &dev_attr_iCountryCodeRelDate);
1474                 if (i < 0) {
1475                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1476                         kfree(acm->country_codes);
1477                         acm->country_codes = NULL;
1478                         acm->country_code_size = 0;
1479                         goto skip_countries;
1480                 }
1481         }
1482 
1483 skip_countries:
1484         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1485                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1486                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1487                          /* works around buggy devices */
1488                          epctrl->bInterval ? epctrl->bInterval : 16);
1489         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1490         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1491 
1492         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1493 
1494         acm->line.dwDTERate = cpu_to_le32(9600);
1495         acm->line.bDataBits = 8;
1496         acm_set_line(acm, &acm->line);
1497 
1498         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1499         usb_set_intfdata(data_interface, acm);
1500 
1501         usb_get_intf(control_interface);
1502         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1503                         &control_interface->dev);
1504         if (IS_ERR(tty_dev)) {
1505                 rv = PTR_ERR(tty_dev);
1506                 goto alloc_fail8;
1507         }
1508 
1509         if (quirks & CLEAR_HALT_CONDITIONS) {
1510                 usb_clear_halt(usb_dev, acm->in);
1511                 usb_clear_halt(usb_dev, acm->out);
1512         }
1513 
1514         return 0;
1515 alloc_fail8:
1516         if (acm->country_codes) {
1517                 device_remove_file(&acm->control->dev,
1518                                 &dev_attr_wCountryCodes);
1519                 device_remove_file(&acm->control->dev,
1520                                 &dev_attr_iCountryCodeRelDate);
1521                 kfree(acm->country_codes);
1522         }
1523         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1524 alloc_fail7:
1525         usb_set_intfdata(intf, NULL);
1526         for (i = 0; i < ACM_NW; i++)
1527                 usb_free_urb(acm->wb[i].urb);
1528 alloc_fail6:
1529         for (i = 0; i < num_rx_buf; i++)
1530                 usb_free_urb(acm->read_urbs[i]);
1531         acm_read_buffers_free(acm);
1532         usb_free_urb(acm->ctrlurb);
1533 alloc_fail5:
1534         acm_write_buffers_free(acm);
1535 alloc_fail4:
1536         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1537 alloc_fail2:
1538         acm_release_minor(acm);
1539 alloc_fail1:
1540         kfree(acm);
1541 alloc_fail:
1542         return rv;
1543 }
1544 
1545 static void acm_disconnect(struct usb_interface *intf)
1546 {
1547         struct acm *acm = usb_get_intfdata(intf);
1548         struct tty_struct *tty;
1549 
1550         /* sibling interface is already cleaning up */
1551         if (!acm)
1552                 return;
1553 
1554         mutex_lock(&acm->mutex);
1555         acm->disconnected = true;
1556         if (acm->country_codes) {
1557                 device_remove_file(&acm->control->dev,
1558                                 &dev_attr_wCountryCodes);
1559                 device_remove_file(&acm->control->dev,
1560                                 &dev_attr_iCountryCodeRelDate);
1561         }
1562         wake_up_all(&acm->wioctl);
1563         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1564         usb_set_intfdata(acm->control, NULL);
1565         usb_set_intfdata(acm->data, NULL);
1566         mutex_unlock(&acm->mutex);
1567 
1568         tty = tty_port_tty_get(&acm->port);
1569         if (tty) {
1570                 tty_vhangup(tty);
1571                 tty_kref_put(tty);
1572         }
1573 
1574         acm_kill_urbs(acm);
1575         cancel_work_sync(&acm->work);
1576 
1577         tty_unregister_device(acm_tty_driver, acm->minor);
1578 
1579         acm_write_buffers_free(acm);
1580         usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1581         acm_read_buffers_free(acm);
1582 
1583         if (!acm->combined_interfaces)
1584                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1585                                         acm->data : acm->control);
1586 
1587         tty_port_put(&acm->port);
1588 }
1589 
1590 #ifdef CONFIG_PM
1591 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1592 {
1593         struct acm *acm = usb_get_intfdata(intf);
1594         int cnt;
1595 
1596         spin_lock_irq(&acm->write_lock);
1597         if (PMSG_IS_AUTO(message)) {
1598                 if (acm->transmitting) {
1599                         spin_unlock_irq(&acm->write_lock);
1600                         return -EBUSY;
1601                 }
1602         }
1603         cnt = acm->susp_count++;
1604         spin_unlock_irq(&acm->write_lock);
1605 
1606         if (cnt)
1607                 return 0;
1608 
1609         acm_kill_urbs(acm);
1610         cancel_work_sync(&acm->work);
1611 
1612         return 0;
1613 }
1614 
1615 static int acm_resume(struct usb_interface *intf)
1616 {
1617         struct acm *acm = usb_get_intfdata(intf);
1618         struct urb *urb;
1619         int rv = 0;
1620 
1621         spin_lock_irq(&acm->write_lock);
1622 
1623         if (--acm->susp_count)
1624                 goto out;
1625 
1626         if (tty_port_initialized(&acm->port)) {
1627                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1628 
1629                 for (;;) {
1630                         urb = usb_get_from_anchor(&acm->delayed);
1631                         if (!urb)
1632                                 break;
1633 
1634                         acm_start_wb(acm, urb->context);
1635                 }
1636 
1637                 /*
1638                  * delayed error checking because we must
1639                  * do the write path at all cost
1640                  */
1641                 if (rv < 0)
1642                         goto out;
1643 
1644                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1645         }
1646 out:
1647         spin_unlock_irq(&acm->write_lock);
1648 
1649         return rv;
1650 }
1651 
1652 static int acm_reset_resume(struct usb_interface *intf)
1653 {
1654         struct acm *acm = usb_get_intfdata(intf);
1655 
1656         if (tty_port_initialized(&acm->port))
1657                 tty_port_tty_hangup(&acm->port, false);
1658 
1659         return acm_resume(intf);
1660 }
1661 
1662 #endif /* CONFIG_PM */
1663 
1664 static int acm_pre_reset(struct usb_interface *intf)
1665 {
1666         struct acm *acm = usb_get_intfdata(intf);
1667 
1668         clear_bit(EVENT_RX_STALL, &acm->flags);
1669 
1670         return 0;
1671 }
1672 
1673 #define NOKIA_PCSUITE_ACM_INFO(x) \
1674                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1675                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1676                 USB_CDC_ACM_PROTO_VENDOR)
1677 
1678 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1679                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1680                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1681                 USB_CDC_ACM_PROTO_VENDOR)
1682 
1683 /*
1684  * USB driver structure.
1685  */
1686 
1687 static const struct usb_device_id acm_ids[] = {
1688         /* quirky and broken devices */
1689         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1690         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1691         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1692         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1693         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1694         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1695         },
1696         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1697         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1698         },
1699         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1700         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1701         },
1702         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1703         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1704         },
1705         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1706         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1707         },
1708         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1709         .driver_info = SINGLE_RX_URB,
1710         },
1711         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1712         .driver_info = SINGLE_RX_URB, /* firmware bug */
1713         },
1714         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1715         .driver_info = SINGLE_RX_URB, /* firmware bug */
1716         },
1717         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1718         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1719         },
1720         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1721         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1722         },
1723         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1724         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1725         },
1726         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1727         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1728         },
1729         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1730         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1731         },
1732         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1733         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1734         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1735         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1736         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1737         },
1738         /* Motorola H24 HSPA module: */
1739         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1740         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1741         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1742         },
1743         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1744         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1745         },
1746         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1747         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1748         },
1749         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1750         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1751         },
1752         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1753         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1754         },
1755         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1756         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1757         },
1758         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1759         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1760         },
1761 
1762         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1763         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1764                                            data interface instead of
1765                                            communications interface.
1766                                            Maybe we should define a new
1767                                            quirk for this. */
1768         },
1769         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1770         .driver_info = NO_UNION_NORMAL,
1771         },
1772         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1773         .driver_info = NO_UNION_NORMAL,
1774         },
1775         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1776         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1777         },
1778         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1779         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1780         },
1781 
1782         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1783         .driver_info = CLEAR_HALT_CONDITIONS,
1784         },
1785 
1786         /* Nokia S60 phones expose two ACM channels. The first is
1787          * a modem and is picked up by the standard AT-command
1788          * information below. The second is 'vendor-specific' but
1789          * is treated as a serial device at the S60 end, so we want
1790          * to expose it on Linux too. */
1791         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1792         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1793         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1794         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1795         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1796         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1797         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1798         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1799         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1800         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1801         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1802         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1803         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1804         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1805         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1806         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1807         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1808         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1809         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1810         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1811         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1812         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1813         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1814         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1815         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1816         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1817         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1818         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1819         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1820         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1821         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1822         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1823         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1824         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1825         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1826         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1827         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1828         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1829         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1830         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1831         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1832         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1833         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1834         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1835         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1836         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1837         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1838         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1839         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1840         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1841         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1842         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1843         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1844         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1845         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1846         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1847         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1848         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1849 
1850         /* Support for Owen devices */
1851         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1852 
1853         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1854 
1855         /* Support for Droids MuIn LCD */
1856         { USB_DEVICE(0x04d8, 0x000b),
1857         .driver_info = NO_DATA_INTERFACE,
1858         },
1859 
1860 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1861         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1862         .driver_info = IGNORE_DEVICE,
1863         },
1864         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1865         .driver_info = IGNORE_DEVICE,
1866         },
1867 #endif
1868 
1869         /*Samsung phone in firmware update mode */
1870         { USB_DEVICE(0x04e8, 0x685d),
1871         .driver_info = IGNORE_DEVICE,
1872         },
1873 
1874         /* Exclude Infineon Flash Loader utility */
1875         { USB_DEVICE(0x058b, 0x0041),
1876         .driver_info = IGNORE_DEVICE,
1877         },
1878 
1879         /* control interfaces without any protocol set */
1880         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1881                 USB_CDC_PROTO_NONE) },
1882 
1883         /* control interfaces with various AT-command sets */
1884         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1885                 USB_CDC_ACM_PROTO_AT_V25TER) },
1886         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1887                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1888         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1889                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1890         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1891                 USB_CDC_ACM_PROTO_AT_GSM) },
1892         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1893                 USB_CDC_ACM_PROTO_AT_3G) },
1894         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1895                 USB_CDC_ACM_PROTO_AT_CDMA) },
1896 
1897         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1898         .driver_info = SEND_ZERO_PACKET,
1899         },
1900 
1901         { }
1902 };
1903 
1904 MODULE_DEVICE_TABLE(usb, acm_ids);
1905 
1906 static struct usb_driver acm_driver = {
1907         .name =         "cdc_acm",
1908         .probe =        acm_probe,
1909         .disconnect =   acm_disconnect,
1910 #ifdef CONFIG_PM
1911         .suspend =      acm_suspend,
1912         .resume =       acm_resume,
1913         .reset_resume = acm_reset_resume,
1914 #endif
1915         .pre_reset =    acm_pre_reset,
1916         .id_table =     acm_ids,
1917 #ifdef CONFIG_PM
1918         .supports_autosuspend = 1,
1919 #endif
1920         .disable_hub_initiated_lpm = 1,
1921 };
1922 
1923 /*
1924  * TTY driver structures.
1925  */
1926 
1927 static const struct tty_operations acm_ops = {
1928         .install =              acm_tty_install,
1929         .open =                 acm_tty_open,
1930         .close =                acm_tty_close,
1931         .cleanup =              acm_tty_cleanup,
1932         .hangup =               acm_tty_hangup,
1933         .write =                acm_tty_write,
1934         .put_char =             acm_tty_put_char,
1935         .flush_chars =          acm_tty_flush_chars,
1936         .write_room =           acm_tty_write_room,
1937         .ioctl =                acm_tty_ioctl,
1938         .throttle =             acm_tty_throttle,
1939         .unthrottle =           acm_tty_unthrottle,
1940         .chars_in_buffer =      acm_tty_chars_in_buffer,
1941         .break_ctl =            acm_tty_break_ctl,
1942         .set_termios =          acm_tty_set_termios,
1943         .tiocmget =             acm_tty_tiocmget,
1944         .tiocmset =             acm_tty_tiocmset,
1945         .get_icount =           acm_tty_get_icount,
1946 };
1947 
1948 /*
1949  * Init / exit.
1950  */
1951 
1952 static int __init acm_init(void)
1953 {
1954         int retval;
1955         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1956         if (!acm_tty_driver)
1957                 return -ENOMEM;
1958         acm_tty_driver->driver_name = "acm",
1959         acm_tty_driver->name = "ttyACM",
1960         acm_tty_driver->major = ACM_TTY_MAJOR,
1961         acm_tty_driver->minor_start = 0,
1962         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1963         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1964         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1965         acm_tty_driver->init_termios = tty_std_termios;
1966         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1967                                                                 HUPCL | CLOCAL;
1968         tty_set_operations(acm_tty_driver, &acm_ops);
1969 
1970         retval = tty_register_driver(acm_tty_driver);
1971         if (retval) {
1972                 put_tty_driver(acm_tty_driver);
1973                 return retval;
1974         }
1975 
1976         retval = usb_register(&acm_driver);
1977         if (retval) {
1978                 tty_unregister_driver(acm_tty_driver);
1979                 put_tty_driver(acm_tty_driver);
1980                 return retval;
1981         }
1982 
1983         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1984 
1985         return 0;
1986 }
1987 
1988 static void __exit acm_exit(void)
1989 {
1990         usb_deregister(&acm_driver);
1991         tty_unregister_driver(acm_tty_driver);
1992         put_tty_driver(acm_tty_driver);
1993         idr_destroy(&acm_minors);
1994 }
1995 
1996 module_init(acm_init);
1997 module_exit(acm_exit);
1998 
1999 MODULE_AUTHOR(DRIVER_AUTHOR);
2000 MODULE_DESCRIPTION(DRIVER_DESC);
2001 MODULE_LICENSE("GPL");
2002 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
2003 

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