Version:  2.0.40 2.2.26 2.4.37 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 3.19 4.0 4.1

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

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