Version:  2.0.40 2.2.26 2.4.37 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 4.3 4.4 4.5

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

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