Version:  2.0.40 2.2.26 2.4.37 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 3.16

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;
126 
127         retval = usb_autopm_get_interface(acm->control);
128         if (retval)
129                 return retval;
130 
131         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
132                 request, USB_RT_ACM, value,
133                 acm->control->altsetting[0].desc.bInterfaceNumber,
134                 buf, len, 5000);
135 
136         dev_dbg(&acm->control->dev,
137                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
138                         __func__, request, value, len, retval);
139 
140         usb_autopm_put_interface(acm->control);
141 
142         return retval < 0 ? retval : 0;
143 }
144 
145 /* devices aren't required to support these requests.
146  * the cdc acm descriptor tells whether they do...
147  */
148 #define acm_set_control(acm, control) \
149         acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
150 #define acm_set_line(acm, line) \
151         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
152 #define acm_send_break(acm, ms) \
153         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
154 
155 /*
156  * Write buffer management.
157  * All of these assume proper locks taken by the caller.
158  */
159 
160 static int acm_wb_alloc(struct acm *acm)
161 {
162         int i, wbn;
163         struct acm_wb *wb;
164 
165         wbn = 0;
166         i = 0;
167         for (;;) {
168                 wb = &acm->wb[wbn];
169                 if (!wb->use) {
170                         wb->use = 1;
171                         return wbn;
172                 }
173                 wbn = (wbn + 1) % ACM_NW;
174                 if (++i >= ACM_NW)
175                         return -1;
176         }
177 }
178 
179 static int acm_wb_is_avail(struct acm *acm)
180 {
181         int i, n;
182         unsigned long flags;
183 
184         n = ACM_NW;
185         spin_lock_irqsave(&acm->write_lock, flags);
186         for (i = 0; i < ACM_NW; i++)
187                 n -= acm->wb[i].use;
188         spin_unlock_irqrestore(&acm->write_lock, flags);
189         return n;
190 }
191 
192 /*
193  * Finish write. Caller must hold acm->write_lock
194  */
195 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
196 {
197         wb->use = 0;
198         acm->transmitting--;
199         usb_autopm_put_interface_async(acm->control);
200 }
201 
202 /*
203  * Poke write.
204  *
205  * the caller is responsible for locking
206  */
207 
208 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
209 {
210         int rc;
211 
212         acm->transmitting++;
213 
214         wb->urb->transfer_buffer = wb->buf;
215         wb->urb->transfer_dma = wb->dmah;
216         wb->urb->transfer_buffer_length = wb->len;
217         wb->urb->dev = acm->dev;
218 
219         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
220         if (rc < 0) {
221                 dev_err(&acm->data->dev,
222                         "%s - usb_submit_urb(write bulk) failed: %d\n",
223                         __func__, rc);
224                 acm_write_done(acm, wb);
225         }
226         return rc;
227 }
228 
229 /*
230  * attributes exported through sysfs
231  */
232 static ssize_t show_caps
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         return sprintf(buf, "%d", acm->ctrl_caps);
239 }
240 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
241 
242 static ssize_t show_country_codes
243 (struct device *dev, struct device_attribute *attr, char *buf)
244 {
245         struct usb_interface *intf = to_usb_interface(dev);
246         struct acm *acm = usb_get_intfdata(intf);
247 
248         memcpy(buf, acm->country_codes, acm->country_code_size);
249         return acm->country_code_size;
250 }
251 
252 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
253 
254 static ssize_t show_country_rel_date
255 (struct device *dev, struct device_attribute *attr, char *buf)
256 {
257         struct usb_interface *intf = to_usb_interface(dev);
258         struct acm *acm = usb_get_intfdata(intf);
259 
260         return sprintf(buf, "%d", acm->country_rel_date);
261 }
262 
263 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
264 /*
265  * Interrupt handlers for various ACM device responses
266  */
267 
268 /* control interface reports status changes with "interrupt" transfers */
269 static void acm_ctrl_irq(struct urb *urb)
270 {
271         struct acm *acm = urb->context;
272         struct usb_cdc_notification *dr = urb->transfer_buffer;
273         unsigned char *data;
274         int newctrl;
275         int difference;
276         int retval;
277         int status = urb->status;
278 
279         switch (status) {
280         case 0:
281                 /* success */
282                 break;
283         case -ECONNRESET:
284         case -ENOENT:
285         case -ESHUTDOWN:
286                 /* this urb is terminated, clean up */
287                 dev_dbg(&acm->control->dev,
288                                 "%s - urb shutting down with status: %d\n",
289                                 __func__, status);
290                 return;
291         default:
292                 dev_dbg(&acm->control->dev,
293                                 "%s - nonzero urb status received: %d\n",
294                                 __func__, status);
295                 goto exit;
296         }
297 
298         usb_mark_last_busy(acm->dev);
299 
300         data = (unsigned char *)(dr + 1);
301         switch (dr->bNotificationType) {
302         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
303                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
304                                                         __func__, dr->wValue);
305                 break;
306 
307         case USB_CDC_NOTIFY_SERIAL_STATE:
308                 newctrl = get_unaligned_le16(data);
309 
310                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
311                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
312                                         __func__);
313                         tty_port_tty_hangup(&acm->port, false);
314                 }
315 
316                 difference = acm->ctrlin ^ newctrl;
317                 spin_lock(&acm->read_lock);
318                 acm->ctrlin = newctrl;
319                 acm->oldcount = acm->iocount;
320 
321                 if (difference & ACM_CTRL_DSR)
322                         acm->iocount.dsr++;
323                 if (difference & ACM_CTRL_BRK)
324                         acm->iocount.brk++;
325                 if (difference & ACM_CTRL_RI)
326                         acm->iocount.rng++;
327                 if (difference & ACM_CTRL_DCD)
328                         acm->iocount.dcd++;
329                 if (difference & ACM_CTRL_FRAMING)
330                         acm->iocount.frame++;
331                 if (difference & ACM_CTRL_PARITY)
332                         acm->iocount.parity++;
333                 if (difference & ACM_CTRL_OVERRUN)
334                         acm->iocount.overrun++;
335                 spin_unlock(&acm->read_lock);
336 
337                 if (difference)
338                         wake_up_all(&acm->wioctl);
339 
340                 break;
341 
342         default:
343                 dev_dbg(&acm->control->dev,
344                         "%s - unknown notification %d received: index %d "
345                         "len %d data0 %d data1 %d\n",
346                         __func__,
347                         dr->bNotificationType, dr->wIndex,
348                         dr->wLength, data[0], data[1]);
349                 break;
350         }
351 exit:
352         retval = usb_submit_urb(urb, GFP_ATOMIC);
353         if (retval)
354                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
355                                                         __func__, retval);
356 }
357 
358 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
359 {
360         int res;
361 
362         if (!test_and_clear_bit(index, &acm->read_urbs_free))
363                 return 0;
364 
365         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
366 
367         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
368         if (res) {
369                 if (res != -EPERM) {
370                         dev_err(&acm->data->dev,
371                                         "%s - usb_submit_urb failed: %d\n",
372                                         __func__, res);
373                 }
374                 set_bit(index, &acm->read_urbs_free);
375                 return res;
376         }
377 
378         return 0;
379 }
380 
381 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
382 {
383         int res;
384         int i;
385 
386         for (i = 0; i < acm->rx_buflimit; ++i) {
387                 res = acm_submit_read_urb(acm, i, mem_flags);
388                 if (res)
389                         return res;
390         }
391 
392         return 0;
393 }
394 
395 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
396 {
397         if (!urb->actual_length)
398                 return;
399 
400         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
401                         urb->actual_length);
402         tty_flip_buffer_push(&acm->port);
403 }
404 
405 static void acm_read_bulk_callback(struct urb *urb)
406 {
407         struct acm_rb *rb = urb->context;
408         struct acm *acm = rb->instance;
409         unsigned long flags;
410 
411         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
412                                         rb->index, urb->actual_length);
413         set_bit(rb->index, &acm->read_urbs_free);
414 
415         if (!acm->dev) {
416                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
417                 return;
418         }
419 
420         if (urb->status) {
421                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
422                                                         __func__, urb->status);
423                 return;
424         }
425 
426         usb_mark_last_busy(acm->dev);
427 
428         acm_process_read_urb(acm, urb);
429 
430         /* throttle device if requested by tty */
431         spin_lock_irqsave(&acm->read_lock, flags);
432         acm->throttled = acm->throttle_req;
433         if (!acm->throttled) {
434                 spin_unlock_irqrestore(&acm->read_lock, flags);
435                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
436         } else {
437                 spin_unlock_irqrestore(&acm->read_lock, flags);
438         }
439 }
440 
441 /* data interface wrote those outgoing bytes */
442 static void acm_write_bulk(struct urb *urb)
443 {
444         struct acm_wb *wb = urb->context;
445         struct acm *acm = wb->instance;
446         unsigned long flags;
447 
448         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
449                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
450                         __func__,
451                         urb->actual_length,
452                         urb->transfer_buffer_length,
453                         urb->status);
454 
455         spin_lock_irqsave(&acm->write_lock, flags);
456         acm_write_done(acm, wb);
457         spin_unlock_irqrestore(&acm->write_lock, flags);
458         schedule_work(&acm->work);
459 }
460 
461 static void acm_softint(struct work_struct *work)
462 {
463         struct acm *acm = container_of(work, struct acm, work);
464 
465         dev_vdbg(&acm->data->dev, "%s\n", __func__);
466 
467         tty_port_tty_wakeup(&acm->port);
468 }
469 
470 /*
471  * TTY handlers
472  */
473 
474 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
475 {
476         struct acm *acm;
477         int retval;
478 
479         dev_dbg(tty->dev, "%s\n", __func__);
480 
481         acm = acm_get_by_index(tty->index);
482         if (!acm)
483                 return -ENODEV;
484 
485         retval = tty_standard_install(driver, tty);
486         if (retval)
487                 goto error_init_termios;
488 
489         tty->driver_data = acm;
490 
491         return 0;
492 
493 error_init_termios:
494         tty_port_put(&acm->port);
495         return retval;
496 }
497 
498 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
499 {
500         struct acm *acm = tty->driver_data;
501 
502         dev_dbg(tty->dev, "%s\n", __func__);
503 
504         return tty_port_open(&acm->port, tty, filp);
505 }
506 
507 static void acm_port_dtr_rts(struct tty_port *port, int raise)
508 {
509         struct acm *acm = container_of(port, struct acm, port);
510         int val;
511         int res;
512 
513         if (raise)
514                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
515         else
516                 val = 0;
517 
518         /* FIXME: add missing ctrlout locking throughout driver */
519         acm->ctrlout = val;
520 
521         res = acm_set_control(acm, val);
522         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
523                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
524 }
525 
526 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
527 {
528         struct acm *acm = container_of(port, struct acm, port);
529         int retval = -ENODEV;
530         int i;
531 
532         dev_dbg(&acm->control->dev, "%s\n", __func__);
533 
534         mutex_lock(&acm->mutex);
535         if (acm->disconnected)
536                 goto disconnected;
537 
538         retval = usb_autopm_get_interface(acm->control);
539         if (retval)
540                 goto error_get_interface;
541 
542         /*
543          * FIXME: Why do we need this? Allocating 64K of physically contiguous
544          * memory is really nasty...
545          */
546         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
547         acm->control->needs_remote_wakeup = 1;
548 
549         acm->ctrlurb->dev = acm->dev;
550         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
551         if (retval) {
552                 dev_err(&acm->control->dev,
553                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
554                 goto error_submit_urb;
555         }
556 
557         /*
558          * Unthrottle device in case the TTY was closed while throttled.
559          */
560         spin_lock_irq(&acm->read_lock);
561         acm->throttled = 0;
562         acm->throttle_req = 0;
563         spin_unlock_irq(&acm->read_lock);
564 
565         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
566         if (retval)
567                 goto error_submit_read_urbs;
568 
569         usb_autopm_put_interface(acm->control);
570 
571         mutex_unlock(&acm->mutex);
572 
573         return 0;
574 
575 error_submit_read_urbs:
576         for (i = 0; i < acm->rx_buflimit; i++)
577                 usb_kill_urb(acm->read_urbs[i]);
578         usb_kill_urb(acm->ctrlurb);
579 error_submit_urb:
580         usb_autopm_put_interface(acm->control);
581 error_get_interface:
582 disconnected:
583         mutex_unlock(&acm->mutex);
584 
585         return usb_translate_errors(retval);
586 }
587 
588 static void acm_port_destruct(struct tty_port *port)
589 {
590         struct acm *acm = container_of(port, struct acm, port);
591 
592         dev_dbg(&acm->control->dev, "%s\n", __func__);
593 
594         acm_release_minor(acm);
595         usb_put_intf(acm->control);
596         kfree(acm->country_codes);
597         kfree(acm);
598 }
599 
600 static void acm_port_shutdown(struct tty_port *port)
601 {
602         struct acm *acm = container_of(port, struct acm, port);
603         struct urb *urb;
604         struct acm_wb *wb;
605         int i;
606 
607         dev_dbg(&acm->control->dev, "%s\n", __func__);
608 
609         /*
610          * Need to grab write_lock to prevent race with resume, but no need to
611          * hold it due to the tty-port initialised flag.
612          */
613         spin_lock_irq(&acm->write_lock);
614         spin_unlock_irq(&acm->write_lock);
615 
616         usb_autopm_get_interface_no_resume(acm->control);
617         acm->control->needs_remote_wakeup = 0;
618         usb_autopm_put_interface(acm->control);
619 
620         for (;;) {
621                 urb = usb_get_from_anchor(&acm->delayed);
622                 if (!urb)
623                         break;
624                 wb = urb->context;
625                 wb->use = 0;
626                 usb_autopm_put_interface_async(acm->control);
627         }
628 
629         usb_kill_urb(acm->ctrlurb);
630         for (i = 0; i < ACM_NW; i++)
631                 usb_kill_urb(acm->wb[i].urb);
632         for (i = 0; i < acm->rx_buflimit; i++)
633                 usb_kill_urb(acm->read_urbs[i]);
634 }
635 
636 static void acm_tty_cleanup(struct tty_struct *tty)
637 {
638         struct acm *acm = tty->driver_data;
639         dev_dbg(&acm->control->dev, "%s\n", __func__);
640         tty_port_put(&acm->port);
641 }
642 
643 static void acm_tty_hangup(struct tty_struct *tty)
644 {
645         struct acm *acm = tty->driver_data;
646         dev_dbg(&acm->control->dev, "%s\n", __func__);
647         tty_port_hangup(&acm->port);
648 }
649 
650 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
651 {
652         struct acm *acm = tty->driver_data;
653         dev_dbg(&acm->control->dev, "%s\n", __func__);
654         tty_port_close(&acm->port, tty, filp);
655 }
656 
657 static int acm_tty_write(struct tty_struct *tty,
658                                         const unsigned char *buf, int count)
659 {
660         struct acm *acm = tty->driver_data;
661         int stat;
662         unsigned long flags;
663         int wbn;
664         struct acm_wb *wb;
665 
666         if (!count)
667                 return 0;
668 
669         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
670 
671         spin_lock_irqsave(&acm->write_lock, flags);
672         wbn = acm_wb_alloc(acm);
673         if (wbn < 0) {
674                 spin_unlock_irqrestore(&acm->write_lock, flags);
675                 return 0;
676         }
677         wb = &acm->wb[wbn];
678 
679         if (!acm->dev) {
680                 wb->use = 0;
681                 spin_unlock_irqrestore(&acm->write_lock, flags);
682                 return -ENODEV;
683         }
684 
685         count = (count > acm->writesize) ? acm->writesize : count;
686         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
687         memcpy(wb->buf, buf, count);
688         wb->len = count;
689 
690         stat = usb_autopm_get_interface_async(acm->control);
691         if (stat) {
692                 wb->use = 0;
693                 spin_unlock_irqrestore(&acm->write_lock, flags);
694                 return stat;
695         }
696 
697         if (acm->susp_count) {
698                 usb_anchor_urb(wb->urb, &acm->delayed);
699                 spin_unlock_irqrestore(&acm->write_lock, flags);
700                 return count;
701         }
702 
703         stat = acm_start_wb(acm, wb);
704         spin_unlock_irqrestore(&acm->write_lock, flags);
705 
706         if (stat < 0)
707                 return stat;
708         return count;
709 }
710 
711 static int acm_tty_write_room(struct tty_struct *tty)
712 {
713         struct acm *acm = tty->driver_data;
714         /*
715          * Do not let the line discipline to know that we have a reserve,
716          * or it might get too enthusiastic.
717          */
718         return acm_wb_is_avail(acm) ? acm->writesize : 0;
719 }
720 
721 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
722 {
723         struct acm *acm = tty->driver_data;
724         /*
725          * if the device was unplugged then any remaining characters fell out
726          * of the connector ;)
727          */
728         if (acm->disconnected)
729                 return 0;
730         /*
731          * This is inaccurate (overcounts), but it works.
732          */
733         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
734 }
735 
736 static void acm_tty_throttle(struct tty_struct *tty)
737 {
738         struct acm *acm = tty->driver_data;
739 
740         spin_lock_irq(&acm->read_lock);
741         acm->throttle_req = 1;
742         spin_unlock_irq(&acm->read_lock);
743 }
744 
745 static void acm_tty_unthrottle(struct tty_struct *tty)
746 {
747         struct acm *acm = tty->driver_data;
748         unsigned int was_throttled;
749 
750         spin_lock_irq(&acm->read_lock);
751         was_throttled = acm->throttled;
752         acm->throttled = 0;
753         acm->throttle_req = 0;
754         spin_unlock_irq(&acm->read_lock);
755 
756         if (was_throttled)
757                 acm_submit_read_urbs(acm, GFP_KERNEL);
758 }
759 
760 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
761 {
762         struct acm *acm = tty->driver_data;
763         int retval;
764 
765         retval = acm_send_break(acm, state ? 0xffff : 0);
766         if (retval < 0)
767                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
768                                                                 __func__);
769         return retval;
770 }
771 
772 static int acm_tty_tiocmget(struct tty_struct *tty)
773 {
774         struct acm *acm = tty->driver_data;
775 
776         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
777                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
778                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
779                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
780                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
781                TIOCM_CTS;
782 }
783 
784 static int acm_tty_tiocmset(struct tty_struct *tty,
785                             unsigned int set, unsigned int clear)
786 {
787         struct acm *acm = tty->driver_data;
788         unsigned int newctrl;
789 
790         newctrl = acm->ctrlout;
791         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
792                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
793         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
794                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
795 
796         newctrl = (newctrl & ~clear) | set;
797 
798         if (acm->ctrlout == newctrl)
799                 return 0;
800         return acm_set_control(acm, acm->ctrlout = newctrl);
801 }
802 
803 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
804 {
805         struct serial_struct tmp;
806 
807         if (!info)
808                 return -EINVAL;
809 
810         memset(&tmp, 0, sizeof(tmp));
811         tmp.flags = ASYNC_LOW_LATENCY;
812         tmp.xmit_fifo_size = acm->writesize;
813         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
814         tmp.close_delay = acm->port.close_delay / 10;
815         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
816                                 ASYNC_CLOSING_WAIT_NONE :
817                                 acm->port.closing_wait / 10;
818 
819         if (copy_to_user(info, &tmp, sizeof(tmp)))
820                 return -EFAULT;
821         else
822                 return 0;
823 }
824 
825 static int set_serial_info(struct acm *acm,
826                                 struct serial_struct __user *newinfo)
827 {
828         struct serial_struct new_serial;
829         unsigned int closing_wait, close_delay;
830         int retval = 0;
831 
832         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
833                 return -EFAULT;
834 
835         close_delay = new_serial.close_delay * 10;
836         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
837                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
838 
839         mutex_lock(&acm->port.mutex);
840 
841         if (!capable(CAP_SYS_ADMIN)) {
842                 if ((close_delay != acm->port.close_delay) ||
843                     (closing_wait != acm->port.closing_wait))
844                         retval = -EPERM;
845                 else
846                         retval = -EOPNOTSUPP;
847         } else {
848                 acm->port.close_delay  = close_delay;
849                 acm->port.closing_wait = closing_wait;
850         }
851 
852         mutex_unlock(&acm->port.mutex);
853         return retval;
854 }
855 
856 static int wait_serial_change(struct acm *acm, unsigned long arg)
857 {
858         int rv = 0;
859         DECLARE_WAITQUEUE(wait, current);
860         struct async_icount old, new;
861 
862         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
863                 return -EINVAL;
864         do {
865                 spin_lock_irq(&acm->read_lock);
866                 old = acm->oldcount;
867                 new = acm->iocount;
868                 acm->oldcount = new;
869                 spin_unlock_irq(&acm->read_lock);
870 
871                 if ((arg & TIOCM_DSR) &&
872                         old.dsr != new.dsr)
873                         break;
874                 if ((arg & TIOCM_CD)  &&
875                         old.dcd != new.dcd)
876                         break;
877                 if ((arg & TIOCM_RI) &&
878                         old.rng != new.rng)
879                         break;
880 
881                 add_wait_queue(&acm->wioctl, &wait);
882                 set_current_state(TASK_INTERRUPTIBLE);
883                 schedule();
884                 remove_wait_queue(&acm->wioctl, &wait);
885                 if (acm->disconnected) {
886                         if (arg & TIOCM_CD)
887                                 break;
888                         else
889                                 rv = -ENODEV;
890                 } else {
891                         if (signal_pending(current))
892                                 rv = -ERESTARTSYS;
893                 }
894         } while (!rv);
895 
896         
897 
898         return rv;
899 }
900 
901 static int get_serial_usage(struct acm *acm,
902                             struct serial_icounter_struct __user *count)
903 {
904         struct serial_icounter_struct icount;
905         int rv = 0;
906 
907         memset(&icount, 0, sizeof(icount));
908         icount.dsr = acm->iocount.dsr;
909         icount.rng = acm->iocount.rng;
910         icount.dcd = acm->iocount.dcd;
911         icount.frame = acm->iocount.frame;
912         icount.overrun = acm->iocount.overrun;
913         icount.parity = acm->iocount.parity;
914         icount.brk = acm->iocount.brk;
915 
916         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
917                 rv = -EFAULT;
918 
919         return rv;
920 }
921 
922 static int acm_tty_ioctl(struct tty_struct *tty,
923                                         unsigned int cmd, unsigned long arg)
924 {
925         struct acm *acm = tty->driver_data;
926         int rv = -ENOIOCTLCMD;
927 
928         switch (cmd) {
929         case TIOCGSERIAL: /* gets serial port data */
930                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
931                 break;
932         case TIOCSSERIAL:
933                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
934                 break;
935         case TIOCMIWAIT:
936                 rv = usb_autopm_get_interface(acm->control);
937                 if (rv < 0) {
938                         rv = -EIO;
939                         break;
940                 }
941                 rv = wait_serial_change(acm, arg);
942                 usb_autopm_put_interface(acm->control);
943                 break;
944         case TIOCGICOUNT:
945                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
946                 break;
947         }
948 
949         return rv;
950 }
951 
952 static void acm_tty_set_termios(struct tty_struct *tty,
953                                                 struct ktermios *termios_old)
954 {
955         struct acm *acm = tty->driver_data;
956         struct ktermios *termios = &tty->termios;
957         struct usb_cdc_line_coding newline;
958         int newctrl = acm->ctrlout;
959 
960         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
961         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
962         newline.bParityType = termios->c_cflag & PARENB ?
963                                 (termios->c_cflag & PARODD ? 1 : 2) +
964                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
965         switch (termios->c_cflag & CSIZE) {
966         case CS5:
967                 newline.bDataBits = 5;
968                 break;
969         case CS6:
970                 newline.bDataBits = 6;
971                 break;
972         case CS7:
973                 newline.bDataBits = 7;
974                 break;
975         case CS8:
976         default:
977                 newline.bDataBits = 8;
978                 break;
979         }
980         /* FIXME: Needs to clear unsupported bits in the termios */
981         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
982 
983         if (!newline.dwDTERate) {
984                 newline.dwDTERate = acm->line.dwDTERate;
985                 newctrl &= ~ACM_CTRL_DTR;
986         } else
987                 newctrl |=  ACM_CTRL_DTR;
988 
989         if (newctrl != acm->ctrlout)
990                 acm_set_control(acm, acm->ctrlout = newctrl);
991 
992         if (memcmp(&acm->line, &newline, sizeof newline)) {
993                 memcpy(&acm->line, &newline, sizeof newline);
994                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
995                         __func__,
996                         le32_to_cpu(newline.dwDTERate),
997                         newline.bCharFormat, newline.bParityType,
998                         newline.bDataBits);
999                 acm_set_line(acm, &acm->line);
1000         }
1001 }
1002 
1003 static const struct tty_port_operations acm_port_ops = {
1004         .dtr_rts = acm_port_dtr_rts,
1005         .shutdown = acm_port_shutdown,
1006         .activate = acm_port_activate,
1007         .destruct = acm_port_destruct,
1008 };
1009 
1010 /*
1011  * USB probe and disconnect routines.
1012  */
1013 
1014 /* Little helpers: write/read buffers free */
1015 static void acm_write_buffers_free(struct acm *acm)
1016 {
1017         int i;
1018         struct acm_wb *wb;
1019         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1020 
1021         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1022                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1023 }
1024 
1025 static void acm_read_buffers_free(struct acm *acm)
1026 {
1027         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1028         int i;
1029 
1030         for (i = 0; i < acm->rx_buflimit; i++)
1031                 usb_free_coherent(usb_dev, acm->readsize,
1032                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1033 }
1034 
1035 /* Little helper: write buffers allocate */
1036 static int acm_write_buffers_alloc(struct acm *acm)
1037 {
1038         int i;
1039         struct acm_wb *wb;
1040 
1041         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1042                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1043                     &wb->dmah);
1044                 if (!wb->buf) {
1045                         while (i != 0) {
1046                                 --i;
1047                                 --wb;
1048                                 usb_free_coherent(acm->dev, acm->writesize,
1049                                     wb->buf, wb->dmah);
1050                         }
1051                         return -ENOMEM;
1052                 }
1053         }
1054         return 0;
1055 }
1056 
1057 static int acm_probe(struct usb_interface *intf,
1058                      const struct usb_device_id *id)
1059 {
1060         struct usb_cdc_union_desc *union_header = NULL;
1061         struct usb_cdc_country_functional_desc *cfd = NULL;
1062         unsigned char *buffer = intf->altsetting->extra;
1063         int buflen = intf->altsetting->extralen;
1064         struct usb_interface *control_interface;
1065         struct usb_interface *data_interface;
1066         struct usb_endpoint_descriptor *epctrl = NULL;
1067         struct usb_endpoint_descriptor *epread = NULL;
1068         struct usb_endpoint_descriptor *epwrite = NULL;
1069         struct usb_device *usb_dev = interface_to_usbdev(intf);
1070         struct acm *acm;
1071         int minor;
1072         int ctrlsize, readsize;
1073         u8 *buf;
1074         u8 ac_management_function = 0;
1075         u8 call_management_function = 0;
1076         int call_interface_num = -1;
1077         int data_interface_num = -1;
1078         unsigned long quirks;
1079         int num_rx_buf;
1080         int i;
1081         int combined_interfaces = 0;
1082         struct device *tty_dev;
1083         int rv = -ENOMEM;
1084 
1085         /* normal quirks */
1086         quirks = (unsigned long)id->driver_info;
1087 
1088         if (quirks == IGNORE_DEVICE)
1089                 return -ENODEV;
1090 
1091         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1092 
1093         /* handle quirks deadly to normal probing*/
1094         if (quirks == NO_UNION_NORMAL) {
1095                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1096                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1097                 goto skip_normal_probe;
1098         }
1099 
1100         /* normal probing*/
1101         if (!buffer) {
1102                 dev_err(&intf->dev, "Weird descriptor references\n");
1103                 return -EINVAL;
1104         }
1105 
1106         if (!buflen) {
1107                 if (intf->cur_altsetting->endpoint &&
1108                                 intf->cur_altsetting->endpoint->extralen &&
1109                                 intf->cur_altsetting->endpoint->extra) {
1110                         dev_dbg(&intf->dev,
1111                                 "Seeking extra descriptors on endpoint\n");
1112                         buflen = intf->cur_altsetting->endpoint->extralen;
1113                         buffer = intf->cur_altsetting->endpoint->extra;
1114                 } else {
1115                         dev_err(&intf->dev,
1116                                 "Zero length descriptor references\n");
1117                         return -EINVAL;
1118                 }
1119         }
1120 
1121         while (buflen > 0) {
1122                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1123                         dev_err(&intf->dev, "skipping garbage\n");
1124                         goto next_desc;
1125                 }
1126 
1127                 switch (buffer[2]) {
1128                 case USB_CDC_UNION_TYPE: /* we've found it */
1129                         if (union_header) {
1130                                 dev_err(&intf->dev, "More than one "
1131                                         "union descriptor, skipping ...\n");
1132                                 goto next_desc;
1133                         }
1134                         union_header = (struct usb_cdc_union_desc *)buffer;
1135                         break;
1136                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1137                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1138                         break;
1139                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1140                         break; /* for now we ignore it */
1141                 case USB_CDC_ACM_TYPE:
1142                         ac_management_function = buffer[3];
1143                         break;
1144                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1145                         call_management_function = buffer[3];
1146                         call_interface_num = buffer[4];
1147                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1148                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1149                         break;
1150                 default:
1151                         /* there are LOTS more CDC descriptors that
1152                          * could legitimately be found here.
1153                          */
1154                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1155                                         "type %02x, length %d\n",
1156                                         buffer[2], buffer[0]);
1157                         break;
1158                 }
1159 next_desc:
1160                 buflen -= buffer[0];
1161                 buffer += buffer[0];
1162         }
1163 
1164         if (!union_header) {
1165                 if (call_interface_num > 0) {
1166                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1167                         /* quirks for Droids MuIn LCD */
1168                         if (quirks & NO_DATA_INTERFACE)
1169                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1170                         else
1171                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1172                         control_interface = intf;
1173                 } else {
1174                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1175                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1176                                 return -ENODEV;
1177                         } else {
1178                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1179                                 combined_interfaces = 1;
1180                                 control_interface = data_interface = intf;
1181                                 goto look_for_collapsed_interface;
1182                         }
1183                 }
1184         } else {
1185                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1186                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1187                 if (!control_interface || !data_interface) {
1188                         dev_dbg(&intf->dev, "no interfaces\n");
1189                         return -ENODEV;
1190                 }
1191         }
1192 
1193         if (data_interface_num != call_interface_num)
1194                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1195 
1196         if (control_interface == data_interface) {
1197                 /* some broken devices designed for windows work this way */
1198                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1199                 combined_interfaces = 1;
1200                 /* a popular other OS doesn't use it */
1201                 quirks |= NO_CAP_LINE;
1202                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1203                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1204                         return -EINVAL;
1205                 }
1206 look_for_collapsed_interface:
1207                 for (i = 0; i < 3; i++) {
1208                         struct usb_endpoint_descriptor *ep;
1209                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1210 
1211                         if (usb_endpoint_is_int_in(ep))
1212                                 epctrl = ep;
1213                         else if (usb_endpoint_is_bulk_out(ep))
1214                                 epwrite = ep;
1215                         else if (usb_endpoint_is_bulk_in(ep))
1216                                 epread = ep;
1217                         else
1218                                 return -EINVAL;
1219                 }
1220                 if (!epctrl || !epread || !epwrite)
1221                         return -ENODEV;
1222                 else
1223                         goto made_compressed_probe;
1224         }
1225 
1226 skip_normal_probe:
1227 
1228         /*workaround for switched interfaces */
1229         if (data_interface->cur_altsetting->desc.bInterfaceClass
1230                                                 != CDC_DATA_INTERFACE_TYPE) {
1231                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1232                                                 == CDC_DATA_INTERFACE_TYPE) {
1233                         struct usb_interface *t;
1234                         dev_dbg(&intf->dev,
1235                                 "Your device has switched interfaces.\n");
1236                         t = control_interface;
1237                         control_interface = data_interface;
1238                         data_interface = t;
1239                 } else {
1240                         return -EINVAL;
1241                 }
1242         }
1243 
1244         /* Accept probe requests only for the control interface */
1245         if (!combined_interfaces && intf != control_interface)
1246                 return -ENODEV;
1247 
1248         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1249                 /* valid in this context */
1250                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1251                 return -EBUSY;
1252         }
1253 
1254 
1255         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1256             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1257                 return -EINVAL;
1258 
1259         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1260         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1261         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1262 
1263 
1264         /* workaround for switched endpoints */
1265         if (!usb_endpoint_dir_in(epread)) {
1266                 /* descriptors are swapped */
1267                 struct usb_endpoint_descriptor *t;
1268                 dev_dbg(&intf->dev,
1269                         "The data interface has switched endpoints\n");
1270                 t = epread;
1271                 epread = epwrite;
1272                 epwrite = t;
1273         }
1274 made_compressed_probe:
1275         dev_dbg(&intf->dev, "interfaces are valid\n");
1276 
1277         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1278         if (acm == NULL) {
1279                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1280                 goto alloc_fail;
1281         }
1282 
1283         minor = acm_alloc_minor(acm);
1284         if (minor == ACM_TTY_MINORS) {
1285                 dev_err(&intf->dev, "no more free acm devices\n");
1286                 kfree(acm);
1287                 return -ENODEV;
1288         }
1289 
1290         ctrlsize = usb_endpoint_maxp(epctrl);
1291         readsize = usb_endpoint_maxp(epread) *
1292                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1293         acm->combined_interfaces = combined_interfaces;
1294         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1295         acm->control = control_interface;
1296         acm->data = data_interface;
1297         acm->minor = minor;
1298         acm->dev = usb_dev;
1299         acm->ctrl_caps = ac_management_function;
1300         if (quirks & NO_CAP_LINE)
1301                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1302         acm->ctrlsize = ctrlsize;
1303         acm->readsize = readsize;
1304         acm->rx_buflimit = num_rx_buf;
1305         INIT_WORK(&acm->work, acm_softint);
1306         init_waitqueue_head(&acm->wioctl);
1307         spin_lock_init(&acm->write_lock);
1308         spin_lock_init(&acm->read_lock);
1309         mutex_init(&acm->mutex);
1310         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1311         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1312         if (acm->is_int_ep)
1313                 acm->bInterval = epread->bInterval;
1314         tty_port_init(&acm->port);
1315         acm->port.ops = &acm_port_ops;
1316         init_usb_anchor(&acm->delayed);
1317 
1318         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1319         if (!buf) {
1320                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1321                 goto alloc_fail2;
1322         }
1323         acm->ctrl_buffer = buf;
1324 
1325         if (acm_write_buffers_alloc(acm) < 0) {
1326                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1327                 goto alloc_fail4;
1328         }
1329 
1330         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1331         if (!acm->ctrlurb) {
1332                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1333                 goto alloc_fail5;
1334         }
1335         for (i = 0; i < num_rx_buf; i++) {
1336                 struct acm_rb *rb = &(acm->read_buffers[i]);
1337                 struct urb *urb;
1338 
1339                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1340                                                                 &rb->dma);
1341                 if (!rb->base) {
1342                         dev_err(&intf->dev, "out of memory "
1343                                         "(read bufs usb_alloc_coherent)\n");
1344                         goto alloc_fail6;
1345                 }
1346                 rb->index = i;
1347                 rb->instance = acm;
1348 
1349                 urb = usb_alloc_urb(0, GFP_KERNEL);
1350                 if (!urb) {
1351                         dev_err(&intf->dev,
1352                                 "out of memory (read urbs usb_alloc_urb)\n");
1353                         goto alloc_fail6;
1354                 }
1355                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1356                 urb->transfer_dma = rb->dma;
1357                 if (acm->is_int_ep) {
1358                         usb_fill_int_urb(urb, acm->dev,
1359                                          acm->rx_endpoint,
1360                                          rb->base,
1361                                          acm->readsize,
1362                                          acm_read_bulk_callback, rb,
1363                                          acm->bInterval);
1364                 } else {
1365                         usb_fill_bulk_urb(urb, acm->dev,
1366                                           acm->rx_endpoint,
1367                                           rb->base,
1368                                           acm->readsize,
1369                                           acm_read_bulk_callback, rb);
1370                 }
1371 
1372                 acm->read_urbs[i] = urb;
1373                 __set_bit(i, &acm->read_urbs_free);
1374         }
1375         for (i = 0; i < ACM_NW; i++) {
1376                 struct acm_wb *snd = &(acm->wb[i]);
1377 
1378                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1379                 if (snd->urb == NULL) {
1380                         dev_err(&intf->dev,
1381                                 "out of memory (write urbs usb_alloc_urb)\n");
1382                         goto alloc_fail7;
1383                 }
1384 
1385                 if (usb_endpoint_xfer_int(epwrite))
1386                         usb_fill_int_urb(snd->urb, usb_dev,
1387                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1388                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1389                 else
1390                         usb_fill_bulk_urb(snd->urb, usb_dev,
1391                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1392                                 NULL, acm->writesize, acm_write_bulk, snd);
1393                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1394                 snd->instance = acm;
1395         }
1396 
1397         usb_set_intfdata(intf, acm);
1398 
1399         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1400         if (i < 0)
1401                 goto alloc_fail7;
1402 
1403         if (cfd) { /* export the country data */
1404                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1405                 if (!acm->country_codes)
1406                         goto skip_countries;
1407                 acm->country_code_size = cfd->bLength - 4;
1408                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1409                                                         cfd->bLength - 4);
1410                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1411 
1412                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1413                 if (i < 0) {
1414                         kfree(acm->country_codes);
1415                         acm->country_codes = NULL;
1416                         acm->country_code_size = 0;
1417                         goto skip_countries;
1418                 }
1419 
1420                 i = device_create_file(&intf->dev,
1421                                                 &dev_attr_iCountryCodeRelDate);
1422                 if (i < 0) {
1423                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1424                         kfree(acm->country_codes);
1425                         acm->country_codes = NULL;
1426                         acm->country_code_size = 0;
1427                         goto skip_countries;
1428                 }
1429         }
1430 
1431 skip_countries:
1432         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1433                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1434                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1435                          /* works around buggy devices */
1436                          epctrl->bInterval ? epctrl->bInterval : 16);
1437         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1438         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1439 
1440         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1441 
1442         acm->line.dwDTERate = cpu_to_le32(9600);
1443         acm->line.bDataBits = 8;
1444         acm_set_line(acm, &acm->line);
1445 
1446         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1447         usb_set_intfdata(data_interface, acm);
1448 
1449         usb_get_intf(control_interface);
1450         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1451                         &control_interface->dev);
1452         if (IS_ERR(tty_dev)) {
1453                 rv = PTR_ERR(tty_dev);
1454                 goto alloc_fail8;
1455         }
1456 
1457         return 0;
1458 alloc_fail8:
1459         if (acm->country_codes) {
1460                 device_remove_file(&acm->control->dev,
1461                                 &dev_attr_wCountryCodes);
1462                 device_remove_file(&acm->control->dev,
1463                                 &dev_attr_iCountryCodeRelDate);
1464         }
1465         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1466 alloc_fail7:
1467         usb_set_intfdata(intf, NULL);
1468         for (i = 0; i < ACM_NW; i++)
1469                 usb_free_urb(acm->wb[i].urb);
1470 alloc_fail6:
1471         for (i = 0; i < num_rx_buf; i++)
1472                 usb_free_urb(acm->read_urbs[i]);
1473         acm_read_buffers_free(acm);
1474         usb_free_urb(acm->ctrlurb);
1475 alloc_fail5:
1476         acm_write_buffers_free(acm);
1477 alloc_fail4:
1478         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1479 alloc_fail2:
1480         acm_release_minor(acm);
1481         kfree(acm);
1482 alloc_fail:
1483         return rv;
1484 }
1485 
1486 static void stop_data_traffic(struct acm *acm)
1487 {
1488         int i;
1489 
1490         dev_dbg(&acm->control->dev, "%s\n", __func__);
1491 
1492         usb_kill_urb(acm->ctrlurb);
1493         for (i = 0; i < ACM_NW; i++)
1494                 usb_kill_urb(acm->wb[i].urb);
1495         for (i = 0; i < acm->rx_buflimit; i++)
1496                 usb_kill_urb(acm->read_urbs[i]);
1497 
1498         cancel_work_sync(&acm->work);
1499 }
1500 
1501 static void acm_disconnect(struct usb_interface *intf)
1502 {
1503         struct acm *acm = usb_get_intfdata(intf);
1504         struct usb_device *usb_dev = interface_to_usbdev(intf);
1505         struct tty_struct *tty;
1506         int i;
1507 
1508         dev_dbg(&intf->dev, "%s\n", __func__);
1509 
1510         /* sibling interface is already cleaning up */
1511         if (!acm)
1512                 return;
1513 
1514         mutex_lock(&acm->mutex);
1515         acm->disconnected = true;
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         }
1522         wake_up_all(&acm->wioctl);
1523         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1524         usb_set_intfdata(acm->control, NULL);
1525         usb_set_intfdata(acm->data, NULL);
1526         mutex_unlock(&acm->mutex);
1527 
1528         tty = tty_port_tty_get(&acm->port);
1529         if (tty) {
1530                 tty_vhangup(tty);
1531                 tty_kref_put(tty);
1532         }
1533 
1534         stop_data_traffic(acm);
1535 
1536         tty_unregister_device(acm_tty_driver, acm->minor);
1537 
1538         usb_free_urb(acm->ctrlurb);
1539         for (i = 0; i < ACM_NW; i++)
1540                 usb_free_urb(acm->wb[i].urb);
1541         for (i = 0; i < acm->rx_buflimit; i++)
1542                 usb_free_urb(acm->read_urbs[i]);
1543         acm_write_buffers_free(acm);
1544         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1545         acm_read_buffers_free(acm);
1546 
1547         if (!acm->combined_interfaces)
1548                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1549                                         acm->data : acm->control);
1550 
1551         tty_port_put(&acm->port);
1552 }
1553 
1554 #ifdef CONFIG_PM
1555 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1556 {
1557         struct acm *acm = usb_get_intfdata(intf);
1558         int cnt;
1559 
1560         spin_lock_irq(&acm->write_lock);
1561         if (PMSG_IS_AUTO(message)) {
1562                 if (acm->transmitting) {
1563                         spin_unlock_irq(&acm->write_lock);
1564                         return -EBUSY;
1565                 }
1566         }
1567         cnt = acm->susp_count++;
1568         spin_unlock_irq(&acm->write_lock);
1569 
1570         if (cnt)
1571                 return 0;
1572 
1573         stop_data_traffic(acm);
1574 
1575         return 0;
1576 }
1577 
1578 static int acm_resume(struct usb_interface *intf)
1579 {
1580         struct acm *acm = usb_get_intfdata(intf);
1581         struct urb *urb;
1582         int rv = 0;
1583 
1584         spin_lock_irq(&acm->write_lock);
1585 
1586         if (--acm->susp_count)
1587                 goto out;
1588 
1589         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1590                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1591 
1592                 for (;;) {
1593                         urb = usb_get_from_anchor(&acm->delayed);
1594                         if (!urb)
1595                                 break;
1596 
1597                         acm_start_wb(acm, urb->context);
1598                 }
1599 
1600                 /*
1601                  * delayed error checking because we must
1602                  * do the write path at all cost
1603                  */
1604                 if (rv < 0)
1605                         goto out;
1606 
1607                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1608         }
1609 out:
1610         spin_unlock_irq(&acm->write_lock);
1611 
1612         return rv;
1613 }
1614 
1615 static int acm_reset_resume(struct usb_interface *intf)
1616 {
1617         struct acm *acm = usb_get_intfdata(intf);
1618 
1619         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1620                 tty_port_tty_hangup(&acm->port, false);
1621 
1622         return acm_resume(intf);
1623 }
1624 
1625 #endif /* CONFIG_PM */
1626 
1627 #define NOKIA_PCSUITE_ACM_INFO(x) \
1628                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1629                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1630                 USB_CDC_ACM_PROTO_VENDOR)
1631 
1632 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1633                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1634                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1635                 USB_CDC_ACM_PROTO_VENDOR)
1636 
1637 /*
1638  * USB driver structure.
1639  */
1640 
1641 static const struct usb_device_id acm_ids[] = {
1642         /* quirky and broken devices */
1643         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1644         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1645         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1646         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1647         },
1648         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1649         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1650         },
1651         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1652         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1653         },
1654         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1655         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1656         },
1657         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1658         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1659         },
1660         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1661         .driver_info = SINGLE_RX_URB,
1662         },
1663         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1664         .driver_info = SINGLE_RX_URB, /* firmware bug */
1665         },
1666         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1667         .driver_info = SINGLE_RX_URB, /* firmware bug */
1668         },
1669         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1670         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1671         },
1672         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1673         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1674         },
1675         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1676         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1677         },
1678         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1679         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1680         },
1681         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1682         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1683         },
1684         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1685         },
1686         /* Motorola H24 HSPA module: */
1687         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1688         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1689         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1690         },
1691         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1692         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1693         },
1694         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1695         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1696         },
1697         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1698         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1699         },
1700         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1701         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1702         },
1703         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1704         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1705         },
1706         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1707         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1708         },
1709 
1710         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1711         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1712                                            data interface instead of
1713                                            communications interface.
1714                                            Maybe we should define a new
1715                                            quirk for this. */
1716         },
1717         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1718         .driver_info = NO_UNION_NORMAL,
1719         },
1720         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1721         .driver_info = NO_UNION_NORMAL,
1722         },
1723         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1724         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1725         },
1726         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1727         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1728         },
1729 
1730         /* Nokia S60 phones expose two ACM channels. The first is
1731          * a modem and is picked up by the standard AT-command
1732          * information below. The second is 'vendor-specific' but
1733          * is treated as a serial device at the S60 end, so we want
1734          * to expose it on Linux too. */
1735         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1736         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1737         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1738         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1739         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1740         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1741         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1742         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1743         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1744         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1745         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1746         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1747         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1748         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1749         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1750         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1751         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1752         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1753         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1754         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1755         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1756         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1757         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1758         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1759         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1760         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1761         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1762         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1763         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1764         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1765         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1766         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1767         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1768         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1769         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1770         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1771         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1772         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1773         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1774         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1775         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1776         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1777         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1778         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1779         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1780         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1781         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1782         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1783         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1784         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1785         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1786         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1787         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1788         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1789         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1790         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1791         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1792         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1793 
1794         /* Support for Owen devices */
1795         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1796 
1797         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1798 
1799         /* Support Lego NXT using pbLua firmware */
1800         { USB_DEVICE(0x0694, 0xff00),
1801         .driver_info = NOT_A_MODEM,
1802         },
1803 
1804         /* Support for Droids MuIn LCD */
1805         { USB_DEVICE(0x04d8, 0x000b),
1806         .driver_info = NO_DATA_INTERFACE,
1807         },
1808 
1809 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1810         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1811         .driver_info = IGNORE_DEVICE,
1812         },
1813         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1814         .driver_info = IGNORE_DEVICE,
1815         },
1816 #endif
1817 
1818         /* control interfaces without any protocol set */
1819         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1820                 USB_CDC_PROTO_NONE) },
1821 
1822         /* control interfaces with various AT-command sets */
1823         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1824                 USB_CDC_ACM_PROTO_AT_V25TER) },
1825         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1826                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1827         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1828                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1829         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1830                 USB_CDC_ACM_PROTO_AT_GSM) },
1831         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1832                 USB_CDC_ACM_PROTO_AT_3G) },
1833         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1834                 USB_CDC_ACM_PROTO_AT_CDMA) },
1835 
1836         { }
1837 };
1838 
1839 MODULE_DEVICE_TABLE(usb, acm_ids);
1840 
1841 static struct usb_driver acm_driver = {
1842         .name =         "cdc_acm",
1843         .probe =        acm_probe,
1844         .disconnect =   acm_disconnect,
1845 #ifdef CONFIG_PM
1846         .suspend =      acm_suspend,
1847         .resume =       acm_resume,
1848         .reset_resume = acm_reset_resume,
1849 #endif
1850         .id_table =     acm_ids,
1851 #ifdef CONFIG_PM
1852         .supports_autosuspend = 1,
1853 #endif
1854         .disable_hub_initiated_lpm = 1,
1855 };
1856 
1857 /*
1858  * TTY driver structures.
1859  */
1860 
1861 static const struct tty_operations acm_ops = {
1862         .install =              acm_tty_install,
1863         .open =                 acm_tty_open,
1864         .close =                acm_tty_close,
1865         .cleanup =              acm_tty_cleanup,
1866         .hangup =               acm_tty_hangup,
1867         .write =                acm_tty_write,
1868         .write_room =           acm_tty_write_room,
1869         .ioctl =                acm_tty_ioctl,
1870         .throttle =             acm_tty_throttle,
1871         .unthrottle =           acm_tty_unthrottle,
1872         .chars_in_buffer =      acm_tty_chars_in_buffer,
1873         .break_ctl =            acm_tty_break_ctl,
1874         .set_termios =          acm_tty_set_termios,
1875         .tiocmget =             acm_tty_tiocmget,
1876         .tiocmset =             acm_tty_tiocmset,
1877 };
1878 
1879 /*
1880  * Init / exit.
1881  */
1882 
1883 static int __init acm_init(void)
1884 {
1885         int retval;
1886         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1887         if (!acm_tty_driver)
1888                 return -ENOMEM;
1889         acm_tty_driver->driver_name = "acm",
1890         acm_tty_driver->name = "ttyACM",
1891         acm_tty_driver->major = ACM_TTY_MAJOR,
1892         acm_tty_driver->minor_start = 0,
1893         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1894         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1895         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1896         acm_tty_driver->init_termios = tty_std_termios;
1897         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1898                                                                 HUPCL | CLOCAL;
1899         tty_set_operations(acm_tty_driver, &acm_ops);
1900 
1901         retval = tty_register_driver(acm_tty_driver);
1902         if (retval) {
1903                 put_tty_driver(acm_tty_driver);
1904                 return retval;
1905         }
1906 
1907         retval = usb_register(&acm_driver);
1908         if (retval) {
1909                 tty_unregister_driver(acm_tty_driver);
1910                 put_tty_driver(acm_tty_driver);
1911                 return retval;
1912         }
1913 
1914         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1915 
1916         return 0;
1917 }
1918 
1919 static void __exit acm_exit(void)
1920 {
1921         usb_deregister(&acm_driver);
1922         tty_unregister_driver(acm_tty_driver);
1923         put_tty_driver(acm_tty_driver);
1924 }
1925 
1926 module_init(acm_init);
1927 module_exit(acm_exit);
1928 
1929 MODULE_AUTHOR(DRIVER_AUTHOR);
1930 MODULE_DESCRIPTION(DRIVER_DESC);
1931 MODULE_LICENSE("GPL");
1932 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
1933 

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