Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

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

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