Version:  2.0.40 2.2.26 2.4.37 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9

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

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