Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/usb/class/cdc-acm.c

  1 /*
  2  * cdc-acm.c
  3  *
  4  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
  5  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
  6  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
  7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
  8  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
  9  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
 10  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
 11  *
 12  * USB Abstract Control Model driver for USB modems and ISDN adapters
 13  *
 14  * Sponsored by SuSE
 15  *
 16  * This program is free software; you can redistribute it and/or modify
 17  * it under the terms of the GNU General Public License as published by
 18  * the Free Software Foundation; either version 2 of the License, or
 19  * (at your option) any later version.
 20  *
 21  * This program is distributed in the hope that it will be useful,
 22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 24  * GNU General Public License for more details.
 25  *
 26  * You should have received a copy of the GNU General Public License
 27  * along with this program; if not, write to the Free Software
 28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 29  */
 30 
 31 #undef DEBUG
 32 #undef VERBOSE_DEBUG
 33 
 34 #include <linux/kernel.h>
 35 #include <linux/errno.h>
 36 #include <linux/init.h>
 37 #include <linux/slab.h>
 38 #include <linux/tty.h>
 39 #include <linux/serial.h>
 40 #include <linux/tty_driver.h>
 41 #include <linux/tty_flip.h>
 42 #include <linux/module.h>
 43 #include <linux/mutex.h>
 44 #include <linux/uaccess.h>
 45 #include <linux/usb.h>
 46 #include <linux/usb/cdc.h>
 47 #include <asm/byteorder.h>
 48 #include <asm/unaligned.h>
 49 #include <linux/list.h>
 50 
 51 #include "cdc-acm.h"
 52 
 53 
 54 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
 55 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
 56 
 57 static struct usb_driver acm_driver;
 58 static struct tty_driver *acm_tty_driver;
 59 static struct acm *acm_table[ACM_TTY_MINORS];
 60 
 61 static DEFINE_MUTEX(acm_table_lock);
 62 
 63 static void acm_tty_set_termios(struct tty_struct *tty,
 64                                 struct ktermios *termios_old);
 65 
 66 /*
 67  * acm_table accessors
 68  */
 69 
 70 /*
 71  * Look up an ACM structure by index. If found and not disconnected, increment
 72  * its refcount and return it with its mutex held.
 73  */
 74 static struct acm *acm_get_by_index(unsigned index)
 75 {
 76         struct acm *acm;
 77 
 78         mutex_lock(&acm_table_lock);
 79         acm = acm_table[index];
 80         if (acm) {
 81                 mutex_lock(&acm->mutex);
 82                 if (acm->disconnected) {
 83                         mutex_unlock(&acm->mutex);
 84                         acm = NULL;
 85                 } else {
 86                         tty_port_get(&acm->port);
 87                         mutex_unlock(&acm->mutex);
 88                 }
 89         }
 90         mutex_unlock(&acm_table_lock);
 91         return acm;
 92 }
 93 
 94 /*
 95  * Try to find an available minor number and if found, associate it with 'acm'.
 96  */
 97 static int acm_alloc_minor(struct acm *acm)
 98 {
 99         int minor;
100 
101         mutex_lock(&acm_table_lock);
102         for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
103                 if (!acm_table[minor]) {
104                         acm_table[minor] = acm;
105                         break;
106                 }
107         }
108         mutex_unlock(&acm_table_lock);
109 
110         return minor;
111 }
112 
113 /* Release the minor number associated with 'acm'.  */
114 static void acm_release_minor(struct acm *acm)
115 {
116         mutex_lock(&acm_table_lock);
117         acm_table[acm->minor] = NULL;
118         mutex_unlock(&acm_table_lock);
119 }
120 
121 /*
122  * Functions for ACM control messages.
123  */
124 
125 static int acm_ctrl_msg(struct acm *acm, int request, int value,
126                                                         void *buf, int len)
127 {
128         int retval;
129 
130         retval = usb_autopm_get_interface(acm->control);
131         if (retval)
132                 return retval;
133 
134         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
135                 request, USB_RT_ACM, value,
136                 acm->control->altsetting[0].desc.bInterfaceNumber,
137                 buf, len, 5000);
138 
139         dev_dbg(&acm->control->dev,
140                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
141                         __func__, request, value, len, retval);
142 
143         usb_autopm_put_interface(acm->control);
144 
145         return retval < 0 ? retval : 0;
146 }
147 
148 /* devices aren't required to support these requests.
149  * the cdc acm descriptor tells whether they do...
150  */
151 static inline int acm_set_control(struct acm *acm, int control)
152 {
153         if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
154                 return -EOPNOTSUPP;
155 
156         return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
157                         control, NULL, 0);
158 }
159 
160 #define acm_set_line(acm, line) \
161         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
162 #define acm_send_break(acm, ms) \
163         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
164 
165 /*
166  * Write buffer management.
167  * All of these assume proper locks taken by the caller.
168  */
169 
170 static int acm_wb_alloc(struct acm *acm)
171 {
172         int i, wbn;
173         struct acm_wb *wb;
174 
175         wbn = 0;
176         i = 0;
177         for (;;) {
178                 wb = &acm->wb[wbn];
179                 if (!wb->use) {
180                         wb->use = 1;
181                         return wbn;
182                 }
183                 wbn = (wbn + 1) % ACM_NW;
184                 if (++i >= ACM_NW)
185                         return -1;
186         }
187 }
188 
189 static int acm_wb_is_avail(struct acm *acm)
190 {
191         int i, n;
192         unsigned long flags;
193 
194         n = ACM_NW;
195         spin_lock_irqsave(&acm->write_lock, flags);
196         for (i = 0; i < ACM_NW; i++)
197                 n -= acm->wb[i].use;
198         spin_unlock_irqrestore(&acm->write_lock, flags);
199         return n;
200 }
201 
202 /*
203  * Finish write. Caller must hold acm->write_lock
204  */
205 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
206 {
207         wb->use = 0;
208         acm->transmitting--;
209         usb_autopm_put_interface_async(acm->control);
210 }
211 
212 /*
213  * Poke write.
214  *
215  * the caller is responsible for locking
216  */
217 
218 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
219 {
220         int rc;
221 
222         acm->transmitting++;
223 
224         wb->urb->transfer_buffer = wb->buf;
225         wb->urb->transfer_dma = wb->dmah;
226         wb->urb->transfer_buffer_length = wb->len;
227         wb->urb->dev = acm->dev;
228 
229         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
230         if (rc < 0) {
231                 dev_err(&acm->data->dev,
232                         "%s - usb_submit_urb(write bulk) failed: %d\n",
233                         __func__, rc);
234                 acm_write_done(acm, wb);
235         }
236         return rc;
237 }
238 
239 /*
240  * attributes exported through sysfs
241  */
242 static ssize_t show_caps
243 (struct device *dev, struct device_attribute *attr, char *buf)
244 {
245         struct usb_interface *intf = to_usb_interface(dev);
246         struct acm *acm = usb_get_intfdata(intf);
247 
248         return sprintf(buf, "%d", acm->ctrl_caps);
249 }
250 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
251 
252 static ssize_t show_country_codes
253 (struct device *dev, struct device_attribute *attr, char *buf)
254 {
255         struct usb_interface *intf = to_usb_interface(dev);
256         struct acm *acm = usb_get_intfdata(intf);
257 
258         memcpy(buf, acm->country_codes, acm->country_code_size);
259         return acm->country_code_size;
260 }
261 
262 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
263 
264 static ssize_t show_country_rel_date
265 (struct device *dev, struct device_attribute *attr, char *buf)
266 {
267         struct usb_interface *intf = to_usb_interface(dev);
268         struct acm *acm = usb_get_intfdata(intf);
269 
270         return sprintf(buf, "%d", acm->country_rel_date);
271 }
272 
273 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
274 /*
275  * Interrupt handlers for various ACM device responses
276  */
277 
278 /* control interface reports status changes with "interrupt" transfers */
279 static void acm_ctrl_irq(struct urb *urb)
280 {
281         struct acm *acm = urb->context;
282         struct usb_cdc_notification *dr = urb->transfer_buffer;
283         unsigned char *data;
284         int newctrl;
285         int difference;
286         int retval;
287         int status = urb->status;
288 
289         switch (status) {
290         case 0:
291                 /* success */
292                 break;
293         case -ECONNRESET:
294         case -ENOENT:
295         case -ESHUTDOWN:
296                 /* this urb is terminated, clean up */
297                 dev_dbg(&acm->control->dev,
298                                 "%s - urb shutting down with status: %d\n",
299                                 __func__, status);
300                 return;
301         default:
302                 dev_dbg(&acm->control->dev,
303                                 "%s - nonzero urb status received: %d\n",
304                                 __func__, status);
305                 goto exit;
306         }
307 
308         usb_mark_last_busy(acm->dev);
309 
310         data = (unsigned char *)(dr + 1);
311         switch (dr->bNotificationType) {
312         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
313                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
314                                                         __func__, dr->wValue);
315                 break;
316 
317         case USB_CDC_NOTIFY_SERIAL_STATE:
318                 newctrl = get_unaligned_le16(data);
319 
320                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
321                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
322                                         __func__);
323                         tty_port_tty_hangup(&acm->port, false);
324                 }
325 
326                 difference = acm->ctrlin ^ newctrl;
327                 spin_lock(&acm->read_lock);
328                 acm->ctrlin = newctrl;
329                 acm->oldcount = acm->iocount;
330 
331                 if (difference & ACM_CTRL_DSR)
332                         acm->iocount.dsr++;
333                 if (difference & ACM_CTRL_BRK)
334                         acm->iocount.brk++;
335                 if (difference & ACM_CTRL_RI)
336                         acm->iocount.rng++;
337                 if (difference & ACM_CTRL_DCD)
338                         acm->iocount.dcd++;
339                 if (difference & ACM_CTRL_FRAMING)
340                         acm->iocount.frame++;
341                 if (difference & ACM_CTRL_PARITY)
342                         acm->iocount.parity++;
343                 if (difference & ACM_CTRL_OVERRUN)
344                         acm->iocount.overrun++;
345                 spin_unlock(&acm->read_lock);
346 
347                 if (difference)
348                         wake_up_all(&acm->wioctl);
349 
350                 break;
351 
352         default:
353                 dev_dbg(&acm->control->dev,
354                         "%s - unknown notification %d received: index %d "
355                         "len %d data0 %d data1 %d\n",
356                         __func__,
357                         dr->bNotificationType, dr->wIndex,
358                         dr->wLength, data[0], data[1]);
359                 break;
360         }
361 exit:
362         retval = usb_submit_urb(urb, GFP_ATOMIC);
363         if (retval)
364                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
365                                                         __func__, retval);
366 }
367 
368 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
369 {
370         int res;
371 
372         if (!test_and_clear_bit(index, &acm->read_urbs_free))
373                 return 0;
374 
375         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
376 
377         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
378         if (res) {
379                 if (res != -EPERM) {
380                         dev_err(&acm->data->dev,
381                                         "%s - usb_submit_urb failed: %d\n",
382                                         __func__, res);
383                 }
384                 set_bit(index, &acm->read_urbs_free);
385                 return res;
386         }
387 
388         return 0;
389 }
390 
391 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
392 {
393         int res;
394         int i;
395 
396         for (i = 0; i < acm->rx_buflimit; ++i) {
397                 res = acm_submit_read_urb(acm, i, mem_flags);
398                 if (res)
399                         return res;
400         }
401 
402         return 0;
403 }
404 
405 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
406 {
407         if (!urb->actual_length)
408                 return;
409 
410         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
411                         urb->actual_length);
412         tty_flip_buffer_push(&acm->port);
413 }
414 
415 static void acm_read_bulk_callback(struct urb *urb)
416 {
417         struct acm_rb *rb = urb->context;
418         struct acm *acm = rb->instance;
419         unsigned long flags;
420 
421         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
422                                         rb->index, urb->actual_length);
423         set_bit(rb->index, &acm->read_urbs_free);
424 
425         if (!acm->dev) {
426                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
427                 return;
428         }
429 
430         if (urb->status) {
431                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
432                                                         __func__, urb->status);
433                 return;
434         }
435 
436         usb_mark_last_busy(acm->dev);
437 
438         acm_process_read_urb(acm, urb);
439 
440         /* throttle device if requested by tty */
441         spin_lock_irqsave(&acm->read_lock, flags);
442         acm->throttled = acm->throttle_req;
443         if (!acm->throttled) {
444                 spin_unlock_irqrestore(&acm->read_lock, flags);
445                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
446         } else {
447                 spin_unlock_irqrestore(&acm->read_lock, flags);
448         }
449 }
450 
451 /* data interface wrote those outgoing bytes */
452 static void acm_write_bulk(struct urb *urb)
453 {
454         struct acm_wb *wb = urb->context;
455         struct acm *acm = wb->instance;
456         unsigned long flags;
457 
458         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
459                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
460                         __func__,
461                         urb->actual_length,
462                         urb->transfer_buffer_length,
463                         urb->status);
464 
465         spin_lock_irqsave(&acm->write_lock, flags);
466         acm_write_done(acm, wb);
467         spin_unlock_irqrestore(&acm->write_lock, flags);
468         schedule_work(&acm->work);
469 }
470 
471 static void acm_softint(struct work_struct *work)
472 {
473         struct acm *acm = container_of(work, struct acm, work);
474 
475         dev_vdbg(&acm->data->dev, "%s\n", __func__);
476 
477         tty_port_tty_wakeup(&acm->port);
478 }
479 
480 /*
481  * TTY handlers
482  */
483 
484 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
485 {
486         struct acm *acm;
487         int retval;
488 
489         dev_dbg(tty->dev, "%s\n", __func__);
490 
491         acm = acm_get_by_index(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         dev_dbg(tty->dev, "%s\n", __func__);
513 
514         return tty_port_open(&acm->port, tty, filp);
515 }
516 
517 static void acm_port_dtr_rts(struct tty_port *port, int raise)
518 {
519         struct acm *acm = container_of(port, struct acm, port);
520         int val;
521         int res;
522 
523         if (raise)
524                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
525         else
526                 val = 0;
527 
528         /* FIXME: add missing ctrlout locking throughout driver */
529         acm->ctrlout = val;
530 
531         res = acm_set_control(acm, val);
532         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
533                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
534 }
535 
536 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
537 {
538         struct acm *acm = container_of(port, struct acm, port);
539         int retval = -ENODEV;
540         int i;
541 
542         dev_dbg(&acm->control->dev, "%s\n", __func__);
543 
544         mutex_lock(&acm->mutex);
545         if (acm->disconnected)
546                 goto disconnected;
547 
548         retval = usb_autopm_get_interface(acm->control);
549         if (retval)
550                 goto error_get_interface;
551 
552         /*
553          * FIXME: Why do we need this? Allocating 64K of physically contiguous
554          * memory is really nasty...
555          */
556         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
557         acm->control->needs_remote_wakeup = 1;
558 
559         acm->ctrlurb->dev = acm->dev;
560         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
561         if (retval) {
562                 dev_err(&acm->control->dev,
563                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
564                 goto error_submit_urb;
565         }
566 
567         acm_tty_set_termios(tty, NULL);
568 
569         /*
570          * Unthrottle device in case the TTY was closed while throttled.
571          */
572         spin_lock_irq(&acm->read_lock);
573         acm->throttled = 0;
574         acm->throttle_req = 0;
575         spin_unlock_irq(&acm->read_lock);
576 
577         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
578         if (retval)
579                 goto error_submit_read_urbs;
580 
581         usb_autopm_put_interface(acm->control);
582 
583         mutex_unlock(&acm->mutex);
584 
585         return 0;
586 
587 error_submit_read_urbs:
588         for (i = 0; i < acm->rx_buflimit; i++)
589                 usb_kill_urb(acm->read_urbs[i]);
590         usb_kill_urb(acm->ctrlurb);
591 error_submit_urb:
592         usb_autopm_put_interface(acm->control);
593 error_get_interface:
594 disconnected:
595         mutex_unlock(&acm->mutex);
596 
597         return usb_translate_errors(retval);
598 }
599 
600 static void acm_port_destruct(struct tty_port *port)
601 {
602         struct acm *acm = container_of(port, struct acm, port);
603 
604         dev_dbg(&acm->control->dev, "%s\n", __func__);
605 
606         acm_release_minor(acm);
607         usb_put_intf(acm->control);
608         kfree(acm->country_codes);
609         kfree(acm);
610 }
611 
612 static void acm_port_shutdown(struct tty_port *port)
613 {
614         struct acm *acm = container_of(port, struct acm, port);
615         struct urb *urb;
616         struct acm_wb *wb;
617         int i;
618 
619         dev_dbg(&acm->control->dev, "%s\n", __func__);
620 
621         /*
622          * Need to grab write_lock to prevent race with resume, but no need to
623          * hold it due to the tty-port initialised flag.
624          */
625         spin_lock_irq(&acm->write_lock);
626         spin_unlock_irq(&acm->write_lock);
627 
628         usb_autopm_get_interface_no_resume(acm->control);
629         acm->control->needs_remote_wakeup = 0;
630         usb_autopm_put_interface(acm->control);
631 
632         for (;;) {
633                 urb = usb_get_from_anchor(&acm->delayed);
634                 if (!urb)
635                         break;
636                 wb = urb->context;
637                 wb->use = 0;
638                 usb_autopm_put_interface_async(acm->control);
639         }
640 
641         usb_kill_urb(acm->ctrlurb);
642         for (i = 0; i < ACM_NW; i++)
643                 usb_kill_urb(acm->wb[i].urb);
644         for (i = 0; i < acm->rx_buflimit; i++)
645                 usb_kill_urb(acm->read_urbs[i]);
646 }
647 
648 static void acm_tty_cleanup(struct tty_struct *tty)
649 {
650         struct acm *acm = tty->driver_data;
651         dev_dbg(&acm->control->dev, "%s\n", __func__);
652         tty_port_put(&acm->port);
653 }
654 
655 static void acm_tty_hangup(struct tty_struct *tty)
656 {
657         struct acm *acm = tty->driver_data;
658         dev_dbg(&acm->control->dev, "%s\n", __func__);
659         tty_port_hangup(&acm->port);
660 }
661 
662 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
663 {
664         struct acm *acm = tty->driver_data;
665         dev_dbg(&acm->control->dev, "%s\n", __func__);
666         tty_port_close(&acm->port, tty, filp);
667 }
668 
669 static int acm_tty_write(struct tty_struct *tty,
670                                         const unsigned char *buf, int count)
671 {
672         struct acm *acm = tty->driver_data;
673         int stat;
674         unsigned long flags;
675         int wbn;
676         struct acm_wb *wb;
677 
678         if (!count)
679                 return 0;
680 
681         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
682 
683         spin_lock_irqsave(&acm->write_lock, flags);
684         wbn = acm_wb_alloc(acm);
685         if (wbn < 0) {
686                 spin_unlock_irqrestore(&acm->write_lock, flags);
687                 return 0;
688         }
689         wb = &acm->wb[wbn];
690 
691         if (!acm->dev) {
692                 wb->use = 0;
693                 spin_unlock_irqrestore(&acm->write_lock, flags);
694                 return -ENODEV;
695         }
696 
697         count = (count > acm->writesize) ? acm->writesize : count;
698         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
699         memcpy(wb->buf, buf, count);
700         wb->len = count;
701 
702         stat = usb_autopm_get_interface_async(acm->control);
703         if (stat) {
704                 wb->use = 0;
705                 spin_unlock_irqrestore(&acm->write_lock, flags);
706                 return stat;
707         }
708 
709         if (acm->susp_count) {
710                 usb_anchor_urb(wb->urb, &acm->delayed);
711                 spin_unlock_irqrestore(&acm->write_lock, flags);
712                 return count;
713         }
714 
715         stat = acm_start_wb(acm, wb);
716         spin_unlock_irqrestore(&acm->write_lock, flags);
717 
718         if (stat < 0)
719                 return stat;
720         return count;
721 }
722 
723 static int acm_tty_write_room(struct tty_struct *tty)
724 {
725         struct acm *acm = tty->driver_data;
726         /*
727          * Do not let the line discipline to know that we have a reserve,
728          * or it might get too enthusiastic.
729          */
730         return acm_wb_is_avail(acm) ? acm->writesize : 0;
731 }
732 
733 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
734 {
735         struct acm *acm = tty->driver_data;
736         /*
737          * if the device was unplugged then any remaining characters fell out
738          * of the connector ;)
739          */
740         if (acm->disconnected)
741                 return 0;
742         /*
743          * This is inaccurate (overcounts), but it works.
744          */
745         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
746 }
747 
748 static void acm_tty_throttle(struct tty_struct *tty)
749 {
750         struct acm *acm = tty->driver_data;
751 
752         spin_lock_irq(&acm->read_lock);
753         acm->throttle_req = 1;
754         spin_unlock_irq(&acm->read_lock);
755 }
756 
757 static void acm_tty_unthrottle(struct tty_struct *tty)
758 {
759         struct acm *acm = tty->driver_data;
760         unsigned int was_throttled;
761 
762         spin_lock_irq(&acm->read_lock);
763         was_throttled = acm->throttled;
764         acm->throttled = 0;
765         acm->throttle_req = 0;
766         spin_unlock_irq(&acm->read_lock);
767 
768         if (was_throttled)
769                 acm_submit_read_urbs(acm, GFP_KERNEL);
770 }
771 
772 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
773 {
774         struct acm *acm = tty->driver_data;
775         int retval;
776 
777         retval = acm_send_break(acm, state ? 0xffff : 0);
778         if (retval < 0)
779                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
780                                                                 __func__);
781         return retval;
782 }
783 
784 static int acm_tty_tiocmget(struct tty_struct *tty)
785 {
786         struct acm *acm = tty->driver_data;
787 
788         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
789                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
790                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
791                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
792                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
793                TIOCM_CTS;
794 }
795 
796 static int acm_tty_tiocmset(struct tty_struct *tty,
797                             unsigned int set, unsigned int clear)
798 {
799         struct acm *acm = tty->driver_data;
800         unsigned int newctrl;
801 
802         newctrl = acm->ctrlout;
803         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
804                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
805         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
806                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
807 
808         newctrl = (newctrl & ~clear) | set;
809 
810         if (acm->ctrlout == newctrl)
811                 return 0;
812         return acm_set_control(acm, acm->ctrlout = newctrl);
813 }
814 
815 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
816 {
817         struct serial_struct tmp;
818 
819         if (!info)
820                 return -EINVAL;
821 
822         memset(&tmp, 0, sizeof(tmp));
823         tmp.flags = ASYNC_LOW_LATENCY;
824         tmp.xmit_fifo_size = acm->writesize;
825         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
826         tmp.close_delay = acm->port.close_delay / 10;
827         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
828                                 ASYNC_CLOSING_WAIT_NONE :
829                                 acm->port.closing_wait / 10;
830 
831         if (copy_to_user(info, &tmp, sizeof(tmp)))
832                 return -EFAULT;
833         else
834                 return 0;
835 }
836 
837 static int set_serial_info(struct acm *acm,
838                                 struct serial_struct __user *newinfo)
839 {
840         struct serial_struct new_serial;
841         unsigned int closing_wait, close_delay;
842         int retval = 0;
843 
844         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
845                 return -EFAULT;
846 
847         close_delay = new_serial.close_delay * 10;
848         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
849                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
850 
851         mutex_lock(&acm->port.mutex);
852 
853         if (!capable(CAP_SYS_ADMIN)) {
854                 if ((close_delay != acm->port.close_delay) ||
855                     (closing_wait != acm->port.closing_wait))
856                         retval = -EPERM;
857                 else
858                         retval = -EOPNOTSUPP;
859         } else {
860                 acm->port.close_delay  = close_delay;
861                 acm->port.closing_wait = closing_wait;
862         }
863 
864         mutex_unlock(&acm->port.mutex);
865         return retval;
866 }
867 
868 static int wait_serial_change(struct acm *acm, unsigned long arg)
869 {
870         int rv = 0;
871         DECLARE_WAITQUEUE(wait, current);
872         struct async_icount old, new;
873 
874         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
875                 return -EINVAL;
876         do {
877                 spin_lock_irq(&acm->read_lock);
878                 old = acm->oldcount;
879                 new = acm->iocount;
880                 acm->oldcount = new;
881                 spin_unlock_irq(&acm->read_lock);
882 
883                 if ((arg & TIOCM_DSR) &&
884                         old.dsr != new.dsr)
885                         break;
886                 if ((arg & TIOCM_CD)  &&
887                         old.dcd != new.dcd)
888                         break;
889                 if ((arg & TIOCM_RI) &&
890                         old.rng != new.rng)
891                         break;
892 
893                 add_wait_queue(&acm->wioctl, &wait);
894                 set_current_state(TASK_INTERRUPTIBLE);
895                 schedule();
896                 remove_wait_queue(&acm->wioctl, &wait);
897                 if (acm->disconnected) {
898                         if (arg & TIOCM_CD)
899                                 break;
900                         else
901                                 rv = -ENODEV;
902                 } else {
903                         if (signal_pending(current))
904                                 rv = -ERESTARTSYS;
905                 }
906         } while (!rv);
907 
908         
909 
910         return rv;
911 }
912 
913 static int get_serial_usage(struct acm *acm,
914                             struct serial_icounter_struct __user *count)
915 {
916         struct serial_icounter_struct icount;
917         int rv = 0;
918 
919         memset(&icount, 0, sizeof(icount));
920         icount.dsr = acm->iocount.dsr;
921         icount.rng = acm->iocount.rng;
922         icount.dcd = acm->iocount.dcd;
923         icount.frame = acm->iocount.frame;
924         icount.overrun = acm->iocount.overrun;
925         icount.parity = acm->iocount.parity;
926         icount.brk = acm->iocount.brk;
927 
928         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
929                 rv = -EFAULT;
930 
931         return rv;
932 }
933 
934 static int acm_tty_ioctl(struct tty_struct *tty,
935                                         unsigned int cmd, unsigned long arg)
936 {
937         struct acm *acm = tty->driver_data;
938         int rv = -ENOIOCTLCMD;
939 
940         switch (cmd) {
941         case TIOCGSERIAL: /* gets serial port data */
942                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
943                 break;
944         case TIOCSSERIAL:
945                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
946                 break;
947         case TIOCMIWAIT:
948                 rv = usb_autopm_get_interface(acm->control);
949                 if (rv < 0) {
950                         rv = -EIO;
951                         break;
952                 }
953                 rv = wait_serial_change(acm, arg);
954                 usb_autopm_put_interface(acm->control);
955                 break;
956         case TIOCGICOUNT:
957                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
958                 break;
959         }
960 
961         return rv;
962 }
963 
964 static void acm_tty_set_termios(struct tty_struct *tty,
965                                                 struct ktermios *termios_old)
966 {
967         struct acm *acm = tty->driver_data;
968         struct ktermios *termios = &tty->termios;
969         struct usb_cdc_line_coding newline;
970         int newctrl = acm->ctrlout;
971 
972         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
973         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
974         newline.bParityType = termios->c_cflag & PARENB ?
975                                 (termios->c_cflag & PARODD ? 1 : 2) +
976                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
977         switch (termios->c_cflag & CSIZE) {
978         case CS5:
979                 newline.bDataBits = 5;
980                 break;
981         case CS6:
982                 newline.bDataBits = 6;
983                 break;
984         case CS7:
985                 newline.bDataBits = 7;
986                 break;
987         case CS8:
988         default:
989                 newline.bDataBits = 8;
990                 break;
991         }
992         /* FIXME: Needs to clear unsupported bits in the termios */
993         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
994 
995         if (C_BAUD(tty) == B0) {
996                 newline.dwDTERate = acm->line.dwDTERate;
997                 newctrl &= ~ACM_CTRL_DTR;
998         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
999                 newctrl |=  ACM_CTRL_DTR;
1000         }
1001 
1002         if (newctrl != acm->ctrlout)
1003                 acm_set_control(acm, acm->ctrlout = newctrl);
1004 
1005         if (memcmp(&acm->line, &newline, sizeof newline)) {
1006                 memcpy(&acm->line, &newline, sizeof newline);
1007                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1008                         __func__,
1009                         le32_to_cpu(newline.dwDTERate),
1010                         newline.bCharFormat, newline.bParityType,
1011                         newline.bDataBits);
1012                 acm_set_line(acm, &acm->line);
1013         }
1014 }
1015 
1016 static const struct tty_port_operations acm_port_ops = {
1017         .dtr_rts = acm_port_dtr_rts,
1018         .shutdown = acm_port_shutdown,
1019         .activate = acm_port_activate,
1020         .destruct = acm_port_destruct,
1021 };
1022 
1023 /*
1024  * USB probe and disconnect routines.
1025  */
1026 
1027 /* Little helpers: write/read buffers free */
1028 static void acm_write_buffers_free(struct acm *acm)
1029 {
1030         int i;
1031         struct acm_wb *wb;
1032         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1033 
1034         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1035                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1036 }
1037 
1038 static void acm_read_buffers_free(struct acm *acm)
1039 {
1040         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1041         int i;
1042 
1043         for (i = 0; i < acm->rx_buflimit; i++)
1044                 usb_free_coherent(usb_dev, acm->readsize,
1045                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1046 }
1047 
1048 /* Little helper: write buffers allocate */
1049 static int acm_write_buffers_alloc(struct acm *acm)
1050 {
1051         int i;
1052         struct acm_wb *wb;
1053 
1054         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1055                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1056                     &wb->dmah);
1057                 if (!wb->buf) {
1058                         while (i != 0) {
1059                                 --i;
1060                                 --wb;
1061                                 usb_free_coherent(acm->dev, acm->writesize,
1062                                     wb->buf, wb->dmah);
1063                         }
1064                         return -ENOMEM;
1065                 }
1066         }
1067         return 0;
1068 }
1069 
1070 static int acm_probe(struct usb_interface *intf,
1071                      const struct usb_device_id *id)
1072 {
1073         struct usb_cdc_union_desc *union_header = NULL;
1074         struct usb_cdc_country_functional_desc *cfd = NULL;
1075         unsigned char *buffer = intf->altsetting->extra;
1076         int buflen = intf->altsetting->extralen;
1077         struct usb_interface *control_interface;
1078         struct usb_interface *data_interface;
1079         struct usb_endpoint_descriptor *epctrl = NULL;
1080         struct usb_endpoint_descriptor *epread = NULL;
1081         struct usb_endpoint_descriptor *epwrite = NULL;
1082         struct usb_device *usb_dev = interface_to_usbdev(intf);
1083         struct acm *acm;
1084         int minor;
1085         int ctrlsize, readsize;
1086         u8 *buf;
1087         u8 ac_management_function = 0;
1088         u8 call_management_function = 0;
1089         int call_interface_num = -1;
1090         int data_interface_num = -1;
1091         unsigned long quirks;
1092         int num_rx_buf;
1093         int i;
1094         int combined_interfaces = 0;
1095         struct device *tty_dev;
1096         int rv = -ENOMEM;
1097 
1098         /* normal quirks */
1099         quirks = (unsigned long)id->driver_info;
1100 
1101         if (quirks == IGNORE_DEVICE)
1102                 return -ENODEV;
1103 
1104         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1105 
1106         /* handle quirks deadly to normal probing*/
1107         if (quirks == NO_UNION_NORMAL) {
1108                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1109                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1110                 goto skip_normal_probe;
1111         }
1112 
1113         /* normal probing*/
1114         if (!buffer) {
1115                 dev_err(&intf->dev, "Weird descriptor references\n");
1116                 return -EINVAL;
1117         }
1118 
1119         if (!buflen) {
1120                 if (intf->cur_altsetting->endpoint &&
1121                                 intf->cur_altsetting->endpoint->extralen &&
1122                                 intf->cur_altsetting->endpoint->extra) {
1123                         dev_dbg(&intf->dev,
1124                                 "Seeking extra descriptors on endpoint\n");
1125                         buflen = intf->cur_altsetting->endpoint->extralen;
1126                         buffer = intf->cur_altsetting->endpoint->extra;
1127                 } else {
1128                         dev_err(&intf->dev,
1129                                 "Zero length descriptor references\n");
1130                         return -EINVAL;
1131                 }
1132         }
1133 
1134         while (buflen > 0) {
1135                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1136                         dev_err(&intf->dev, "skipping garbage\n");
1137                         goto next_desc;
1138                 }
1139 
1140                 switch (buffer[2]) {
1141                 case USB_CDC_UNION_TYPE: /* we've found it */
1142                         if (union_header) {
1143                                 dev_err(&intf->dev, "More than one "
1144                                         "union descriptor, skipping ...\n");
1145                                 goto next_desc;
1146                         }
1147                         union_header = (struct usb_cdc_union_desc *)buffer;
1148                         break;
1149                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1150                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1151                         break;
1152                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1153                         break; /* for now we ignore it */
1154                 case USB_CDC_ACM_TYPE:
1155                         ac_management_function = buffer[3];
1156                         break;
1157                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1158                         call_management_function = buffer[3];
1159                         call_interface_num = buffer[4];
1160                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1161                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1162                         break;
1163                 default:
1164                         /* there are LOTS more CDC descriptors that
1165                          * could legitimately be found here.
1166                          */
1167                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1168                                         "type %02x, length %d\n",
1169                                         buffer[2], buffer[0]);
1170                         break;
1171                 }
1172 next_desc:
1173                 buflen -= buffer[0];
1174                 buffer += buffer[0];
1175         }
1176 
1177         if (!union_header) {
1178                 if (call_interface_num > 0) {
1179                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1180                         /* quirks for Droids MuIn LCD */
1181                         if (quirks & NO_DATA_INTERFACE)
1182                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1183                         else
1184                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1185                         control_interface = intf;
1186                 } else {
1187                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1188                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1189                                 return -ENODEV;
1190                         } else {
1191                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1192                                 combined_interfaces = 1;
1193                                 control_interface = data_interface = intf;
1194                                 goto look_for_collapsed_interface;
1195                         }
1196                 }
1197         } else {
1198                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1199                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1200                 if (!control_interface || !data_interface) {
1201                         dev_dbg(&intf->dev, "no interfaces\n");
1202                         return -ENODEV;
1203                 }
1204         }
1205 
1206         if (data_interface_num != call_interface_num)
1207                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1208 
1209         if (control_interface == data_interface) {
1210                 /* some broken devices designed for windows work this way */
1211                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1212                 combined_interfaces = 1;
1213                 /* a popular other OS doesn't use it */
1214                 quirks |= NO_CAP_LINE;
1215                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1216                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1217                         return -EINVAL;
1218                 }
1219 look_for_collapsed_interface:
1220                 for (i = 0; i < 3; i++) {
1221                         struct usb_endpoint_descriptor *ep;
1222                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1223 
1224                         if (usb_endpoint_is_int_in(ep))
1225                                 epctrl = ep;
1226                         else if (usb_endpoint_is_bulk_out(ep))
1227                                 epwrite = ep;
1228                         else if (usb_endpoint_is_bulk_in(ep))
1229                                 epread = ep;
1230                         else
1231                                 return -EINVAL;
1232                 }
1233                 if (!epctrl || !epread || !epwrite)
1234                         return -ENODEV;
1235                 else
1236                         goto made_compressed_probe;
1237         }
1238 
1239 skip_normal_probe:
1240 
1241         /*workaround for switched interfaces */
1242         if (data_interface->cur_altsetting->desc.bInterfaceClass
1243                                                 != CDC_DATA_INTERFACE_TYPE) {
1244                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1245                                                 == CDC_DATA_INTERFACE_TYPE) {
1246                         struct usb_interface *t;
1247                         dev_dbg(&intf->dev,
1248                                 "Your device has switched interfaces.\n");
1249                         t = control_interface;
1250                         control_interface = data_interface;
1251                         data_interface = t;
1252                 } else {
1253                         return -EINVAL;
1254                 }
1255         }
1256 
1257         /* Accept probe requests only for the control interface */
1258         if (!combined_interfaces && intf != control_interface)
1259                 return -ENODEV;
1260 
1261         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1262                 /* valid in this context */
1263                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1264                 return -EBUSY;
1265         }
1266 
1267 
1268         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1269             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1270                 return -EINVAL;
1271 
1272         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1273         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1274         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1275 
1276 
1277         /* workaround for switched endpoints */
1278         if (!usb_endpoint_dir_in(epread)) {
1279                 /* descriptors are swapped */
1280                 struct usb_endpoint_descriptor *t;
1281                 dev_dbg(&intf->dev,
1282                         "The data interface has switched endpoints\n");
1283                 t = epread;
1284                 epread = epwrite;
1285                 epwrite = t;
1286         }
1287 made_compressed_probe:
1288         dev_dbg(&intf->dev, "interfaces are valid\n");
1289 
1290         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1291         if (acm == NULL) {
1292                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1293                 goto alloc_fail;
1294         }
1295 
1296         minor = acm_alloc_minor(acm);
1297         if (minor == ACM_TTY_MINORS) {
1298                 dev_err(&intf->dev, "no more free acm devices\n");
1299                 kfree(acm);
1300                 return -ENODEV;
1301         }
1302 
1303         ctrlsize = usb_endpoint_maxp(epctrl);
1304         readsize = usb_endpoint_maxp(epread) *
1305                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1306         acm->combined_interfaces = combined_interfaces;
1307         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1308         acm->control = control_interface;
1309         acm->data = data_interface;
1310         acm->minor = minor;
1311         acm->dev = usb_dev;
1312         acm->ctrl_caps = ac_management_function;
1313         if (quirks & NO_CAP_LINE)
1314                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1315         acm->ctrlsize = ctrlsize;
1316         acm->readsize = readsize;
1317         acm->rx_buflimit = num_rx_buf;
1318         INIT_WORK(&acm->work, acm_softint);
1319         init_waitqueue_head(&acm->wioctl);
1320         spin_lock_init(&acm->write_lock);
1321         spin_lock_init(&acm->read_lock);
1322         mutex_init(&acm->mutex);
1323         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1324         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1325         if (acm->is_int_ep)
1326                 acm->bInterval = epread->bInterval;
1327         tty_port_init(&acm->port);
1328         acm->port.ops = &acm_port_ops;
1329         init_usb_anchor(&acm->delayed);
1330         acm->quirks = quirks;
1331 
1332         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1333         if (!buf) {
1334                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1335                 goto alloc_fail2;
1336         }
1337         acm->ctrl_buffer = buf;
1338 
1339         if (acm_write_buffers_alloc(acm) < 0) {
1340                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1341                 goto alloc_fail4;
1342         }
1343 
1344         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1345         if (!acm->ctrlurb) {
1346                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1347                 goto alloc_fail5;
1348         }
1349         for (i = 0; i < num_rx_buf; i++) {
1350                 struct acm_rb *rb = &(acm->read_buffers[i]);
1351                 struct urb *urb;
1352 
1353                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1354                                                                 &rb->dma);
1355                 if (!rb->base) {
1356                         dev_err(&intf->dev, "out of memory "
1357                                         "(read bufs usb_alloc_coherent)\n");
1358                         goto alloc_fail6;
1359                 }
1360                 rb->index = i;
1361                 rb->instance = acm;
1362 
1363                 urb = usb_alloc_urb(0, GFP_KERNEL);
1364                 if (!urb) {
1365                         dev_err(&intf->dev,
1366                                 "out of memory (read urbs usb_alloc_urb)\n");
1367                         goto alloc_fail6;
1368                 }
1369                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1370                 urb->transfer_dma = rb->dma;
1371                 if (acm->is_int_ep) {
1372                         usb_fill_int_urb(urb, acm->dev,
1373                                          acm->rx_endpoint,
1374                                          rb->base,
1375                                          acm->readsize,
1376                                          acm_read_bulk_callback, rb,
1377                                          acm->bInterval);
1378                 } else {
1379                         usb_fill_bulk_urb(urb, acm->dev,
1380                                           acm->rx_endpoint,
1381                                           rb->base,
1382                                           acm->readsize,
1383                                           acm_read_bulk_callback, rb);
1384                 }
1385 
1386                 acm->read_urbs[i] = urb;
1387                 __set_bit(i, &acm->read_urbs_free);
1388         }
1389         for (i = 0; i < ACM_NW; i++) {
1390                 struct acm_wb *snd = &(acm->wb[i]);
1391 
1392                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1393                 if (snd->urb == NULL) {
1394                         dev_err(&intf->dev,
1395                                 "out of memory (write urbs usb_alloc_urb)\n");
1396                         goto alloc_fail7;
1397                 }
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                 snd->instance = acm;
1409         }
1410 
1411         usb_set_intfdata(intf, acm);
1412 
1413         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1414         if (i < 0)
1415                 goto alloc_fail7;
1416 
1417         if (cfd) { /* export the country data */
1418                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1419                 if (!acm->country_codes)
1420                         goto skip_countries;
1421                 acm->country_code_size = cfd->bLength - 4;
1422                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1423                                                         cfd->bLength - 4);
1424                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1425 
1426                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1427                 if (i < 0) {
1428                         kfree(acm->country_codes);
1429                         acm->country_codes = NULL;
1430                         acm->country_code_size = 0;
1431                         goto skip_countries;
1432                 }
1433 
1434                 i = device_create_file(&intf->dev,
1435                                                 &dev_attr_iCountryCodeRelDate);
1436                 if (i < 0) {
1437                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1438                         kfree(acm->country_codes);
1439                         acm->country_codes = NULL;
1440                         acm->country_code_size = 0;
1441                         goto skip_countries;
1442                 }
1443         }
1444 
1445 skip_countries:
1446         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1447                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1448                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1449                          /* works around buggy devices */
1450                          epctrl->bInterval ? epctrl->bInterval : 16);
1451         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1452         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1453 
1454         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1455 
1456         acm->line.dwDTERate = cpu_to_le32(9600);
1457         acm->line.bDataBits = 8;
1458         acm_set_line(acm, &acm->line);
1459 
1460         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1461         usb_set_intfdata(data_interface, acm);
1462 
1463         usb_get_intf(control_interface);
1464         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1465                         &control_interface->dev);
1466         if (IS_ERR(tty_dev)) {
1467                 rv = PTR_ERR(tty_dev);
1468                 goto alloc_fail8;
1469         }
1470 
1471         return 0;
1472 alloc_fail8:
1473         if (acm->country_codes) {
1474                 device_remove_file(&acm->control->dev,
1475                                 &dev_attr_wCountryCodes);
1476                 device_remove_file(&acm->control->dev,
1477                                 &dev_attr_iCountryCodeRelDate);
1478         }
1479         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1480 alloc_fail7:
1481         usb_set_intfdata(intf, NULL);
1482         for (i = 0; i < ACM_NW; i++)
1483                 usb_free_urb(acm->wb[i].urb);
1484 alloc_fail6:
1485         for (i = 0; i < num_rx_buf; i++)
1486                 usb_free_urb(acm->read_urbs[i]);
1487         acm_read_buffers_free(acm);
1488         usb_free_urb(acm->ctrlurb);
1489 alloc_fail5:
1490         acm_write_buffers_free(acm);
1491 alloc_fail4:
1492         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1493 alloc_fail2:
1494         acm_release_minor(acm);
1495         kfree(acm);
1496 alloc_fail:
1497         return rv;
1498 }
1499 
1500 static void stop_data_traffic(struct acm *acm)
1501 {
1502         int i;
1503 
1504         dev_dbg(&acm->control->dev, "%s\n", __func__);
1505 
1506         usb_kill_urb(acm->ctrlurb);
1507         for (i = 0; i < ACM_NW; i++)
1508                 usb_kill_urb(acm->wb[i].urb);
1509         for (i = 0; i < acm->rx_buflimit; i++)
1510                 usb_kill_urb(acm->read_urbs[i]);
1511 
1512         cancel_work_sync(&acm->work);
1513 }
1514 
1515 static void acm_disconnect(struct usb_interface *intf)
1516 {
1517         struct acm *acm = usb_get_intfdata(intf);
1518         struct usb_device *usb_dev = interface_to_usbdev(intf);
1519         struct tty_struct *tty;
1520         int i;
1521 
1522         dev_dbg(&intf->dev, "%s\n", __func__);
1523 
1524         /* sibling interface is already cleaning up */
1525         if (!acm)
1526                 return;
1527 
1528         mutex_lock(&acm->mutex);
1529         acm->disconnected = true;
1530         if (acm->country_codes) {
1531                 device_remove_file(&acm->control->dev,
1532                                 &dev_attr_wCountryCodes);
1533                 device_remove_file(&acm->control->dev,
1534                                 &dev_attr_iCountryCodeRelDate);
1535         }
1536         wake_up_all(&acm->wioctl);
1537         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1538         usb_set_intfdata(acm->control, NULL);
1539         usb_set_intfdata(acm->data, NULL);
1540         mutex_unlock(&acm->mutex);
1541 
1542         tty = tty_port_tty_get(&acm->port);
1543         if (tty) {
1544                 tty_vhangup(tty);
1545                 tty_kref_put(tty);
1546         }
1547 
1548         stop_data_traffic(acm);
1549 
1550         tty_unregister_device(acm_tty_driver, acm->minor);
1551 
1552         usb_free_urb(acm->ctrlurb);
1553         for (i = 0; i < ACM_NW; i++)
1554                 usb_free_urb(acm->wb[i].urb);
1555         for (i = 0; i < acm->rx_buflimit; i++)
1556                 usb_free_urb(acm->read_urbs[i]);
1557         acm_write_buffers_free(acm);
1558         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1559         acm_read_buffers_free(acm);
1560 
1561         if (!acm->combined_interfaces)
1562                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1563                                         acm->data : acm->control);
1564 
1565         tty_port_put(&acm->port);
1566 }
1567 
1568 #ifdef CONFIG_PM
1569 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1570 {
1571         struct acm *acm = usb_get_intfdata(intf);
1572         int cnt;
1573 
1574         spin_lock_irq(&acm->write_lock);
1575         if (PMSG_IS_AUTO(message)) {
1576                 if (acm->transmitting) {
1577                         spin_unlock_irq(&acm->write_lock);
1578                         return -EBUSY;
1579                 }
1580         }
1581         cnt = acm->susp_count++;
1582         spin_unlock_irq(&acm->write_lock);
1583 
1584         if (cnt)
1585                 return 0;
1586 
1587         stop_data_traffic(acm);
1588 
1589         return 0;
1590 }
1591 
1592 static int acm_resume(struct usb_interface *intf)
1593 {
1594         struct acm *acm = usb_get_intfdata(intf);
1595         struct urb *urb;
1596         int rv = 0;
1597 
1598         spin_lock_irq(&acm->write_lock);
1599 
1600         if (--acm->susp_count)
1601                 goto out;
1602 
1603         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1604                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1605 
1606                 for (;;) {
1607                         urb = usb_get_from_anchor(&acm->delayed);
1608                         if (!urb)
1609                                 break;
1610 
1611                         acm_start_wb(acm, urb->context);
1612                 }
1613 
1614                 /*
1615                  * delayed error checking because we must
1616                  * do the write path at all cost
1617                  */
1618                 if (rv < 0)
1619                         goto out;
1620 
1621                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1622         }
1623 out:
1624         spin_unlock_irq(&acm->write_lock);
1625 
1626         return rv;
1627 }
1628 
1629 static int acm_reset_resume(struct usb_interface *intf)
1630 {
1631         struct acm *acm = usb_get_intfdata(intf);
1632 
1633         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1634                 tty_port_tty_hangup(&acm->port, false);
1635 
1636         return acm_resume(intf);
1637 }
1638 
1639 #endif /* CONFIG_PM */
1640 
1641 #define NOKIA_PCSUITE_ACM_INFO(x) \
1642                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1643                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1644                 USB_CDC_ACM_PROTO_VENDOR)
1645 
1646 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1647                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1648                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1649                 USB_CDC_ACM_PROTO_VENDOR)
1650 
1651 /*
1652  * USB driver structure.
1653  */
1654 
1655 static const struct usb_device_id acm_ids[] = {
1656         /* quirky and broken devices */
1657         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1658         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1659         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1660         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1661         },
1662         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1663         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1664         },
1665         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1666         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1667         },
1668         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1669         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1670         },
1671         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1672         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1673         },
1674         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1675         .driver_info = SINGLE_RX_URB,
1676         },
1677         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1678         .driver_info = SINGLE_RX_URB, /* firmware bug */
1679         },
1680         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1681         .driver_info = SINGLE_RX_URB, /* firmware bug */
1682         },
1683         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1684         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1685         },
1686         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1687         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1688         },
1689         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1690         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1691         },
1692         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1693         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1694         },
1695         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1696         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1697         },
1698         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1699         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1700         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1701         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1702         },
1703         /* Motorola H24 HSPA module: */
1704         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1705         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1706         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1707         },
1708         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1709         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1710         },
1711         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1712         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1713         },
1714         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1715         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1716         },
1717         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1718         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1719         },
1720         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1721         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1722         },
1723         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1724         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1725         },
1726 
1727         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1728         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1729                                            data interface instead of
1730                                            communications interface.
1731                                            Maybe we should define a new
1732                                            quirk for this. */
1733         },
1734         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1735         .driver_info = NO_UNION_NORMAL,
1736         },
1737         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1738         .driver_info = NO_UNION_NORMAL,
1739         },
1740         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1741         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1742         },
1743         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1744         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1745         },
1746 
1747         /* Nokia S60 phones expose two ACM channels. The first is
1748          * a modem and is picked up by the standard AT-command
1749          * information below. The second is 'vendor-specific' but
1750          * is treated as a serial device at the S60 end, so we want
1751          * to expose it on Linux too. */
1752         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1753         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1754         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1755         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1756         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1757         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1758         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1759         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1760         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1761         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1762         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1763         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1764         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1765         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1766         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1767         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1768         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1769         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1770         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1771         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1772         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1773         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1774         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1775         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1776         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1777         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1778         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1779         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1780         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1781         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1782         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1783         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1784         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1785         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1786         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1787         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1788         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1789         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1790         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1791         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1792         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1793         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1794         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1795         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1796         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1797         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1798         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1799         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1800         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1801         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1802         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1803         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1804         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1805         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1806         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1807         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1808         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1809         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1810 
1811         /* Support for Owen devices */
1812         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1813 
1814         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1815 
1816         /* Support Lego NXT using pbLua firmware */
1817         { USB_DEVICE(0x0694, 0xff00),
1818         .driver_info = NOT_A_MODEM,
1819         },
1820 
1821         /* Support for Droids MuIn LCD */
1822         { USB_DEVICE(0x04d8, 0x000b),
1823         .driver_info = NO_DATA_INTERFACE,
1824         },
1825 
1826 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1827         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1828         .driver_info = IGNORE_DEVICE,
1829         },
1830         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1831         .driver_info = IGNORE_DEVICE,
1832         },
1833 #endif
1834 
1835         /* control interfaces without any protocol set */
1836         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1837                 USB_CDC_PROTO_NONE) },
1838 
1839         /* control interfaces with various AT-command sets */
1840         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1841                 USB_CDC_ACM_PROTO_AT_V25TER) },
1842         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1843                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1844         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1845                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1846         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1847                 USB_CDC_ACM_PROTO_AT_GSM) },
1848         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1849                 USB_CDC_ACM_PROTO_AT_3G) },
1850         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1851                 USB_CDC_ACM_PROTO_AT_CDMA) },
1852 
1853         { }
1854 };
1855 
1856 MODULE_DEVICE_TABLE(usb, acm_ids);
1857 
1858 static struct usb_driver acm_driver = {
1859         .name =         "cdc_acm",
1860         .probe =        acm_probe,
1861         .disconnect =   acm_disconnect,
1862 #ifdef CONFIG_PM
1863         .suspend =      acm_suspend,
1864         .resume =       acm_resume,
1865         .reset_resume = acm_reset_resume,
1866 #endif
1867         .id_table =     acm_ids,
1868 #ifdef CONFIG_PM
1869         .supports_autosuspend = 1,
1870 #endif
1871         .disable_hub_initiated_lpm = 1,
1872 };
1873 
1874 /*
1875  * TTY driver structures.
1876  */
1877 
1878 static const struct tty_operations acm_ops = {
1879         .install =              acm_tty_install,
1880         .open =                 acm_tty_open,
1881         .close =                acm_tty_close,
1882         .cleanup =              acm_tty_cleanup,
1883         .hangup =               acm_tty_hangup,
1884         .write =                acm_tty_write,
1885         .write_room =           acm_tty_write_room,
1886         .ioctl =                acm_tty_ioctl,
1887         .throttle =             acm_tty_throttle,
1888         .unthrottle =           acm_tty_unthrottle,
1889         .chars_in_buffer =      acm_tty_chars_in_buffer,
1890         .break_ctl =            acm_tty_break_ctl,
1891         .set_termios =          acm_tty_set_termios,
1892         .tiocmget =             acm_tty_tiocmget,
1893         .tiocmset =             acm_tty_tiocmset,
1894 };
1895 
1896 /*
1897  * Init / exit.
1898  */
1899 
1900 static int __init acm_init(void)
1901 {
1902         int retval;
1903         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1904         if (!acm_tty_driver)
1905                 return -ENOMEM;
1906         acm_tty_driver->driver_name = "acm",
1907         acm_tty_driver->name = "ttyACM",
1908         acm_tty_driver->major = ACM_TTY_MAJOR,
1909         acm_tty_driver->minor_start = 0,
1910         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1911         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1912         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1913         acm_tty_driver->init_termios = tty_std_termios;
1914         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1915                                                                 HUPCL | CLOCAL;
1916         tty_set_operations(acm_tty_driver, &acm_ops);
1917 
1918         retval = tty_register_driver(acm_tty_driver);
1919         if (retval) {
1920                 put_tty_driver(acm_tty_driver);
1921                 return retval;
1922         }
1923 
1924         retval = usb_register(&acm_driver);
1925         if (retval) {
1926                 tty_unregister_driver(acm_tty_driver);
1927                 put_tty_driver(acm_tty_driver);
1928                 return retval;
1929         }
1930 
1931         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1932 
1933         return 0;
1934 }
1935 
1936 static void __exit acm_exit(void)
1937 {
1938         usb_deregister(&acm_driver);
1939         tty_unregister_driver(acm_tty_driver);
1940         put_tty_driver(acm_tty_driver);
1941 }
1942 
1943 module_init(acm_init);
1944 module_exit(acm_exit);
1945 
1946 MODULE_AUTHOR(DRIVER_AUTHOR);
1947 MODULE_DESCRIPTION(DRIVER_DESC);
1948 MODULE_LICENSE("GPL");
1949 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
1950 

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