Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

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

  1 /*
  2  * cdc-acm.c
  3  *
  4  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
  5  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
  6  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
  7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
  8  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
  9  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
 10  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
 11  *
 12  * USB Abstract Control Model driver for USB modems and ISDN adapters
 13  *
 14  * Sponsored by SuSE
 15  *
 16  * This program is free software; you can redistribute it and/or modify
 17  * it under the terms of the GNU General Public License as published by
 18  * the Free Software Foundation; either version 2 of the License, or
 19  * (at your option) any later version.
 20  *
 21  * This program is distributed in the hope that it will be useful,
 22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 24  * GNU General Public License for more details.
 25  *
 26  * You should have received a copy of the GNU General Public License
 27  * along with this program; if not, write to the Free Software
 28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 29  */
 30 
 31 #undef DEBUG
 32 #undef VERBOSE_DEBUG
 33 
 34 #include <linux/kernel.h>
 35 #include <linux/errno.h>
 36 #include <linux/init.h>
 37 #include <linux/slab.h>
 38 #include <linux/tty.h>
 39 #include <linux/serial.h>
 40 #include <linux/tty_driver.h>
 41 #include <linux/tty_flip.h>
 42 #include <linux/module.h>
 43 #include <linux/mutex.h>
 44 #include <linux/uaccess.h>
 45 #include <linux/usb.h>
 46 #include <linux/usb/cdc.h>
 47 #include <asm/byteorder.h>
 48 #include <asm/unaligned.h>
 49 #include <linux/idr.h>
 50 #include <linux/list.h>
 51 
 52 #include "cdc-acm.h"
 53 
 54 
 55 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
 56 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
 57 
 58 static struct usb_driver acm_driver;
 59 static struct tty_driver *acm_tty_driver;
 60 
 61 static DEFINE_IDR(acm_minors);
 62 static DEFINE_MUTEX(acm_minors_lock);
 63 
 64 static void acm_tty_set_termios(struct tty_struct *tty,
 65                                 struct ktermios *termios_old);
 66 
 67 /*
 68  * acm_minors accessors
 69  */
 70 
 71 /*
 72  * Look up an ACM structure by minor. If found and not disconnected, increment
 73  * its refcount and return it with its mutex held.
 74  */
 75 static struct acm *acm_get_by_minor(unsigned int minor)
 76 {
 77         struct acm *acm;
 78 
 79         mutex_lock(&acm_minors_lock);
 80         acm = idr_find(&acm_minors, minor);
 81         if (acm) {
 82                 mutex_lock(&acm->mutex);
 83                 if (acm->disconnected) {
 84                         mutex_unlock(&acm->mutex);
 85                         acm = NULL;
 86                 } else {
 87                         tty_port_get(&acm->port);
 88                         mutex_unlock(&acm->mutex);
 89                 }
 90         }
 91         mutex_unlock(&acm_minors_lock);
 92         return acm;
 93 }
 94 
 95 /*
 96  * Try to find an available minor number and if found, associate it with 'acm'.
 97  */
 98 static int acm_alloc_minor(struct acm *acm)
 99 {
100         int minor;
101 
102         mutex_lock(&acm_minors_lock);
103         minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
104         mutex_unlock(&acm_minors_lock);
105 
106         return minor;
107 }
108 
109 /* Release the minor number associated with 'acm'.  */
110 static void acm_release_minor(struct acm *acm)
111 {
112         mutex_lock(&acm_minors_lock);
113         idr_remove(&acm_minors, acm->minor);
114         mutex_unlock(&acm_minors_lock);
115 }
116 
117 /*
118  * Functions for ACM control messages.
119  */
120 
121 static int acm_ctrl_msg(struct acm *acm, int request, int value,
122                                                         void *buf, int len)
123 {
124         int retval;
125 
126         retval = usb_autopm_get_interface(acm->control);
127         if (retval)
128                 return retval;
129 
130         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
131                 request, USB_RT_ACM, value,
132                 acm->control->altsetting[0].desc.bInterfaceNumber,
133                 buf, len, 5000);
134 
135         dev_dbg(&acm->control->dev,
136                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
137                         __func__, request, value, len, retval);
138 
139         usb_autopm_put_interface(acm->control);
140 
141         return retval < 0 ? retval : 0;
142 }
143 
144 /* devices aren't required to support these requests.
145  * the cdc acm descriptor tells whether they do...
146  */
147 static inline int acm_set_control(struct acm *acm, int control)
148 {
149         if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
150                 return -EOPNOTSUPP;
151 
152         return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
153                         control, NULL, 0);
154 }
155 
156 #define acm_set_line(acm, line) \
157         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
158 #define acm_send_break(acm, ms) \
159         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
160 
161 /*
162  * Write buffer management.
163  * All of these assume proper locks taken by the caller.
164  */
165 
166 static int acm_wb_alloc(struct acm *acm)
167 {
168         int i, wbn;
169         struct acm_wb *wb;
170 
171         wbn = 0;
172         i = 0;
173         for (;;) {
174                 wb = &acm->wb[wbn];
175                 if (!wb->use) {
176                         wb->use = 1;
177                         return wbn;
178                 }
179                 wbn = (wbn + 1) % ACM_NW;
180                 if (++i >= ACM_NW)
181                         return -1;
182         }
183 }
184 
185 static int acm_wb_is_avail(struct acm *acm)
186 {
187         int i, n;
188         unsigned long flags;
189 
190         n = ACM_NW;
191         spin_lock_irqsave(&acm->write_lock, flags);
192         for (i = 0; i < ACM_NW; i++)
193                 n -= acm->wb[i].use;
194         spin_unlock_irqrestore(&acm->write_lock, flags);
195         return n;
196 }
197 
198 /*
199  * Finish write. Caller must hold acm->write_lock
200  */
201 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
202 {
203         wb->use = 0;
204         acm->transmitting--;
205         usb_autopm_put_interface_async(acm->control);
206 }
207 
208 /*
209  * Poke write.
210  *
211  * the caller is responsible for locking
212  */
213 
214 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
215 {
216         int rc;
217 
218         acm->transmitting++;
219 
220         wb->urb->transfer_buffer = wb->buf;
221         wb->urb->transfer_dma = wb->dmah;
222         wb->urb->transfer_buffer_length = wb->len;
223         wb->urb->dev = acm->dev;
224 
225         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
226         if (rc < 0) {
227                 dev_err(&acm->data->dev,
228                         "%s - usb_submit_urb(write bulk) failed: %d\n",
229                         __func__, rc);
230                 acm_write_done(acm, wb);
231         }
232         return rc;
233 }
234 
235 /*
236  * attributes exported through sysfs
237  */
238 static ssize_t show_caps
239 (struct device *dev, struct device_attribute *attr, char *buf)
240 {
241         struct usb_interface *intf = to_usb_interface(dev);
242         struct acm *acm = usb_get_intfdata(intf);
243 
244         return sprintf(buf, "%d", acm->ctrl_caps);
245 }
246 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
247 
248 static ssize_t show_country_codes
249 (struct device *dev, struct device_attribute *attr, char *buf)
250 {
251         struct usb_interface *intf = to_usb_interface(dev);
252         struct acm *acm = usb_get_intfdata(intf);
253 
254         memcpy(buf, acm->country_codes, acm->country_code_size);
255         return acm->country_code_size;
256 }
257 
258 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
259 
260 static ssize_t show_country_rel_date
261 (struct device *dev, struct device_attribute *attr, char *buf)
262 {
263         struct usb_interface *intf = to_usb_interface(dev);
264         struct acm *acm = usb_get_intfdata(intf);
265 
266         return sprintf(buf, "%d", acm->country_rel_date);
267 }
268 
269 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
270 /*
271  * Interrupt handlers for various ACM device responses
272  */
273 
274 /* control interface reports status changes with "interrupt" transfers */
275 static void acm_ctrl_irq(struct urb *urb)
276 {
277         struct acm *acm = urb->context;
278         struct usb_cdc_notification *dr = urb->transfer_buffer;
279         unsigned char *data;
280         int newctrl;
281         int difference;
282         int retval;
283         int status = urb->status;
284 
285         switch (status) {
286         case 0:
287                 /* success */
288                 break;
289         case -ECONNRESET:
290         case -ENOENT:
291         case -ESHUTDOWN:
292                 /* this urb is terminated, clean up */
293                 dev_dbg(&acm->control->dev,
294                                 "%s - urb shutting down with status: %d\n",
295                                 __func__, status);
296                 return;
297         default:
298                 dev_dbg(&acm->control->dev,
299                                 "%s - nonzero urb status received: %d\n",
300                                 __func__, status);
301                 goto exit;
302         }
303 
304         usb_mark_last_busy(acm->dev);
305 
306         data = (unsigned char *)(dr + 1);
307         switch (dr->bNotificationType) {
308         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
309                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
310                                                         __func__, dr->wValue);
311                 break;
312 
313         case USB_CDC_NOTIFY_SERIAL_STATE:
314                 newctrl = get_unaligned_le16(data);
315 
316                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
317                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
318                                         __func__);
319                         tty_port_tty_hangup(&acm->port, false);
320                 }
321 
322                 difference = acm->ctrlin ^ newctrl;
323                 spin_lock(&acm->read_lock);
324                 acm->ctrlin = newctrl;
325                 acm->oldcount = acm->iocount;
326 
327                 if (difference & ACM_CTRL_DSR)
328                         acm->iocount.dsr++;
329                 if (difference & ACM_CTRL_BRK)
330                         acm->iocount.brk++;
331                 if (difference & ACM_CTRL_RI)
332                         acm->iocount.rng++;
333                 if (difference & ACM_CTRL_DCD)
334                         acm->iocount.dcd++;
335                 if (difference & ACM_CTRL_FRAMING)
336                         acm->iocount.frame++;
337                 if (difference & ACM_CTRL_PARITY)
338                         acm->iocount.parity++;
339                 if (difference & ACM_CTRL_OVERRUN)
340                         acm->iocount.overrun++;
341                 spin_unlock(&acm->read_lock);
342 
343                 if (difference)
344                         wake_up_all(&acm->wioctl);
345 
346                 break;
347 
348         default:
349                 dev_dbg(&acm->control->dev,
350                         "%s - unknown notification %d received: index %d "
351                         "len %d data0 %d data1 %d\n",
352                         __func__,
353                         dr->bNotificationType, dr->wIndex,
354                         dr->wLength, data[0], data[1]);
355                 break;
356         }
357 exit:
358         retval = usb_submit_urb(urb, GFP_ATOMIC);
359         if (retval && retval != -EPERM)
360                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
361                                                         __func__, retval);
362 }
363 
364 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
365 {
366         int res;
367 
368         if (!test_and_clear_bit(index, &acm->read_urbs_free))
369                 return 0;
370 
371         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
372 
373         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
374         if (res) {
375                 if (res != -EPERM) {
376                         dev_err(&acm->data->dev,
377                                         "%s - usb_submit_urb failed: %d\n",
378                                         __func__, res);
379                 }
380                 set_bit(index, &acm->read_urbs_free);
381                 return res;
382         }
383 
384         return 0;
385 }
386 
387 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
388 {
389         int res;
390         int i;
391 
392         for (i = 0; i < acm->rx_buflimit; ++i) {
393                 res = acm_submit_read_urb(acm, i, mem_flags);
394                 if (res)
395                         return res;
396         }
397 
398         return 0;
399 }
400 
401 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
402 {
403         if (!urb->actual_length)
404                 return;
405 
406         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
407                         urb->actual_length);
408         tty_flip_buffer_push(&acm->port);
409 }
410 
411 static void acm_read_bulk_callback(struct urb *urb)
412 {
413         struct acm_rb *rb = urb->context;
414         struct acm *acm = rb->instance;
415         unsigned long flags;
416         int status = urb->status;
417 
418         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
419                                         rb->index, urb->actual_length);
420 
421         if (!acm->dev) {
422                 set_bit(rb->index, &acm->read_urbs_free);
423                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
424                 return;
425         }
426 
427         if (status) {
428                 set_bit(rb->index, &acm->read_urbs_free);
429                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
430                                                         __func__, status);
431                 if ((status != -ENOENT) || (urb->actual_length == 0))
432                         return;
433         }
434 
435         usb_mark_last_busy(acm->dev);
436 
437         acm_process_read_urb(acm, urb);
438         /*
439          * Unthrottle may run on another CPU which needs to see events
440          * in the same order. Submission has an implict barrier
441          */
442         smp_mb__before_atomic();
443         set_bit(rb->index, &acm->read_urbs_free);
444 
445         /* throttle device if requested by tty */
446         spin_lock_irqsave(&acm->read_lock, flags);
447         acm->throttled = acm->throttle_req;
448         if (!acm->throttled) {
449                 spin_unlock_irqrestore(&acm->read_lock, flags);
450                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
451         } else {
452                 spin_unlock_irqrestore(&acm->read_lock, flags);
453         }
454 }
455 
456 /* data interface wrote those outgoing bytes */
457 static void acm_write_bulk(struct urb *urb)
458 {
459         struct acm_wb *wb = urb->context;
460         struct acm *acm = wb->instance;
461         unsigned long flags;
462         int status = urb->status;
463 
464         if (status || (urb->actual_length != urb->transfer_buffer_length))
465                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
466                         __func__,
467                         urb->actual_length,
468                         urb->transfer_buffer_length,
469                         status);
470 
471         spin_lock_irqsave(&acm->write_lock, flags);
472         acm_write_done(acm, wb);
473         spin_unlock_irqrestore(&acm->write_lock, flags);
474         schedule_work(&acm->work);
475 }
476 
477 static void acm_softint(struct work_struct *work)
478 {
479         struct acm *acm = container_of(work, struct acm, work);
480 
481         dev_vdbg(&acm->data->dev, "%s\n", __func__);
482 
483         tty_port_tty_wakeup(&acm->port);
484 }
485 
486 /*
487  * TTY handlers
488  */
489 
490 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
491 {
492         struct acm *acm;
493         int retval;
494 
495         dev_dbg(tty->dev, "%s\n", __func__);
496 
497         acm = acm_get_by_minor(tty->index);
498         if (!acm)
499                 return -ENODEV;
500 
501         retval = tty_standard_install(driver, tty);
502         if (retval)
503                 goto error_init_termios;
504 
505         tty->driver_data = acm;
506 
507         return 0;
508 
509 error_init_termios:
510         tty_port_put(&acm->port);
511         return retval;
512 }
513 
514 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
515 {
516         struct acm *acm = tty->driver_data;
517 
518         dev_dbg(tty->dev, "%s\n", __func__);
519 
520         return tty_port_open(&acm->port, tty, filp);
521 }
522 
523 static void acm_port_dtr_rts(struct tty_port *port, int raise)
524 {
525         struct acm *acm = container_of(port, struct acm, port);
526         int val;
527         int res;
528 
529         if (raise)
530                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
531         else
532                 val = 0;
533 
534         /* FIXME: add missing ctrlout locking throughout driver */
535         acm->ctrlout = val;
536 
537         res = acm_set_control(acm, val);
538         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
539                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
540 }
541 
542 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
543 {
544         struct acm *acm = container_of(port, struct acm, port);
545         int retval = -ENODEV;
546         int i;
547 
548         dev_dbg(&acm->control->dev, "%s\n", __func__);
549 
550         mutex_lock(&acm->mutex);
551         if (acm->disconnected)
552                 goto disconnected;
553 
554         retval = usb_autopm_get_interface(acm->control);
555         if (retval)
556                 goto error_get_interface;
557 
558         /*
559          * FIXME: Why do we need this? Allocating 64K of physically contiguous
560          * memory is really nasty...
561          */
562         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
563         acm->control->needs_remote_wakeup = 1;
564 
565         acm->ctrlurb->dev = acm->dev;
566         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
567         if (retval) {
568                 dev_err(&acm->control->dev,
569                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
570                 goto error_submit_urb;
571         }
572 
573         acm_tty_set_termios(tty, NULL);
574 
575         /*
576          * Unthrottle device in case the TTY was closed while throttled.
577          */
578         spin_lock_irq(&acm->read_lock);
579         acm->throttled = 0;
580         acm->throttle_req = 0;
581         spin_unlock_irq(&acm->read_lock);
582 
583         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
584         if (retval)
585                 goto error_submit_read_urbs;
586 
587         usb_autopm_put_interface(acm->control);
588 
589         mutex_unlock(&acm->mutex);
590 
591         return 0;
592 
593 error_submit_read_urbs:
594         for (i = 0; i < acm->rx_buflimit; i++)
595                 usb_kill_urb(acm->read_urbs[i]);
596         usb_kill_urb(acm->ctrlurb);
597 error_submit_urb:
598         usb_autopm_put_interface(acm->control);
599 error_get_interface:
600 disconnected:
601         mutex_unlock(&acm->mutex);
602 
603         return usb_translate_errors(retval);
604 }
605 
606 static void acm_port_destruct(struct tty_port *port)
607 {
608         struct acm *acm = container_of(port, struct acm, port);
609 
610         dev_dbg(&acm->control->dev, "%s\n", __func__);
611 
612         acm_release_minor(acm);
613         usb_put_intf(acm->control);
614         kfree(acm->country_codes);
615         kfree(acm);
616 }
617 
618 static void acm_port_shutdown(struct tty_port *port)
619 {
620         struct acm *acm = container_of(port, struct acm, port);
621         struct urb *urb;
622         struct acm_wb *wb;
623         int i;
624 
625         dev_dbg(&acm->control->dev, "%s\n", __func__);
626 
627         /*
628          * Need to grab write_lock to prevent race with resume, but no need to
629          * hold it due to the tty-port initialised flag.
630          */
631         spin_lock_irq(&acm->write_lock);
632         spin_unlock_irq(&acm->write_lock);
633 
634         usb_autopm_get_interface_no_resume(acm->control);
635         acm->control->needs_remote_wakeup = 0;
636         usb_autopm_put_interface(acm->control);
637 
638         for (;;) {
639                 urb = usb_get_from_anchor(&acm->delayed);
640                 if (!urb)
641                         break;
642                 wb = urb->context;
643                 wb->use = 0;
644                 usb_autopm_put_interface_async(acm->control);
645         }
646 
647         usb_kill_urb(acm->ctrlurb);
648         for (i = 0; i < ACM_NW; i++)
649                 usb_kill_urb(acm->wb[i].urb);
650         for (i = 0; i < acm->rx_buflimit; i++)
651                 usb_kill_urb(acm->read_urbs[i]);
652 }
653 
654 static void acm_tty_cleanup(struct tty_struct *tty)
655 {
656         struct acm *acm = tty->driver_data;
657         dev_dbg(&acm->control->dev, "%s\n", __func__);
658         tty_port_put(&acm->port);
659 }
660 
661 static void acm_tty_hangup(struct tty_struct *tty)
662 {
663         struct acm *acm = tty->driver_data;
664         dev_dbg(&acm->control->dev, "%s\n", __func__);
665         tty_port_hangup(&acm->port);
666 }
667 
668 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
669 {
670         struct acm *acm = tty->driver_data;
671         dev_dbg(&acm->control->dev, "%s\n", __func__);
672         tty_port_close(&acm->port, tty, filp);
673 }
674 
675 static int acm_tty_write(struct tty_struct *tty,
676                                         const unsigned char *buf, int count)
677 {
678         struct acm *acm = tty->driver_data;
679         int stat;
680         unsigned long flags;
681         int wbn;
682         struct acm_wb *wb;
683 
684         if (!count)
685                 return 0;
686 
687         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
688 
689         spin_lock_irqsave(&acm->write_lock, flags);
690         wbn = acm_wb_alloc(acm);
691         if (wbn < 0) {
692                 spin_unlock_irqrestore(&acm->write_lock, flags);
693                 return 0;
694         }
695         wb = &acm->wb[wbn];
696 
697         if (!acm->dev) {
698                 wb->use = 0;
699                 spin_unlock_irqrestore(&acm->write_lock, flags);
700                 return -ENODEV;
701         }
702 
703         count = (count > acm->writesize) ? acm->writesize : count;
704         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
705         memcpy(wb->buf, buf, count);
706         wb->len = count;
707 
708         stat = usb_autopm_get_interface_async(acm->control);
709         if (stat) {
710                 wb->use = 0;
711                 spin_unlock_irqrestore(&acm->write_lock, flags);
712                 return stat;
713         }
714 
715         if (acm->susp_count) {
716                 if (acm->putbuffer) {
717                         /* now to preserve order */
718                         usb_anchor_urb(acm->putbuffer->urb, &acm->delayed);
719                         acm->putbuffer = NULL;
720                 }
721                 usb_anchor_urb(wb->urb, &acm->delayed);
722                 spin_unlock_irqrestore(&acm->write_lock, flags);
723                 return count;
724         } else {
725                 if (acm->putbuffer) {
726                         /* at this point there is no good way to handle errors */
727                         acm_start_wb(acm, acm->putbuffer);
728                         acm->putbuffer = NULL;
729                 }
730         }
731 
732         stat = acm_start_wb(acm, wb);
733         spin_unlock_irqrestore(&acm->write_lock, flags);
734 
735         if (stat < 0)
736                 return stat;
737         return count;
738 }
739 
740 static void acm_tty_flush_chars(struct tty_struct *tty)
741 {
742         struct acm *acm = tty->driver_data;
743         struct acm_wb *cur = acm->putbuffer;
744         int err;
745         unsigned long flags;
746 
747         if (!cur) /* nothing to do */
748                 return;
749 
750         acm->putbuffer = NULL;
751         err = usb_autopm_get_interface_async(acm->control);
752         spin_lock_irqsave(&acm->write_lock, flags);
753         if (err < 0) {
754                 cur->use = 0;
755                 acm->putbuffer = cur;
756                 goto out;
757         }
758 
759         if (acm->susp_count)
760                 usb_anchor_urb(cur->urb, &acm->delayed);
761         else
762                 acm_start_wb(acm, cur);
763 out:
764         spin_unlock_irqrestore(&acm->write_lock, flags);
765         return;
766 }
767 
768 static int acm_tty_put_char(struct tty_struct *tty, unsigned char ch)
769 {
770         struct acm *acm = tty->driver_data;
771         struct acm_wb *cur;
772         int wbn;
773         unsigned long flags;
774 
775 overflow:
776         cur = acm->putbuffer;
777         if (!cur) {
778                 spin_lock_irqsave(&acm->write_lock, flags);
779                 wbn = acm_wb_alloc(acm);
780                 if (wbn >= 0) {
781                         cur = &acm->wb[wbn];
782                         acm->putbuffer = cur;
783                 }
784                 spin_unlock_irqrestore(&acm->write_lock, flags);
785                 if (!cur)
786                         return 0;
787         }
788 
789         if (cur->len == acm->writesize) {
790                 acm_tty_flush_chars(tty);
791                 goto overflow;
792         }
793 
794         cur->buf[cur->len++] = ch;
795         return 1;
796 }
797 
798 static int acm_tty_write_room(struct tty_struct *tty)
799 {
800         struct acm *acm = tty->driver_data;
801         /*
802          * Do not let the line discipline to know that we have a reserve,
803          * or it might get too enthusiastic.
804          */
805         return acm_wb_is_avail(acm) ? acm->writesize : 0;
806 }
807 
808 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
809 {
810         struct acm *acm = tty->driver_data;
811         /*
812          * if the device was unplugged then any remaining characters fell out
813          * of the connector ;)
814          */
815         if (acm->disconnected)
816                 return 0;
817         /*
818          * This is inaccurate (overcounts), but it works.
819          */
820         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
821 }
822 
823 static void acm_tty_throttle(struct tty_struct *tty)
824 {
825         struct acm *acm = tty->driver_data;
826 
827         spin_lock_irq(&acm->read_lock);
828         acm->throttle_req = 1;
829         spin_unlock_irq(&acm->read_lock);
830 }
831 
832 static void acm_tty_unthrottle(struct tty_struct *tty)
833 {
834         struct acm *acm = tty->driver_data;
835         unsigned int was_throttled;
836 
837         spin_lock_irq(&acm->read_lock);
838         was_throttled = acm->throttled;
839         acm->throttled = 0;
840         acm->throttle_req = 0;
841         spin_unlock_irq(&acm->read_lock);
842 
843         if (was_throttled)
844                 acm_submit_read_urbs(acm, GFP_KERNEL);
845 }
846 
847 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
848 {
849         struct acm *acm = tty->driver_data;
850         int retval;
851 
852         retval = acm_send_break(acm, state ? 0xffff : 0);
853         if (retval < 0)
854                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
855                                                                 __func__);
856         return retval;
857 }
858 
859 static int acm_tty_tiocmget(struct tty_struct *tty)
860 {
861         struct acm *acm = tty->driver_data;
862 
863         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
864                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
865                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
866                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
867                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
868                TIOCM_CTS;
869 }
870 
871 static int acm_tty_tiocmset(struct tty_struct *tty,
872                             unsigned int set, unsigned int clear)
873 {
874         struct acm *acm = tty->driver_data;
875         unsigned int newctrl;
876 
877         newctrl = acm->ctrlout;
878         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
879                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
880         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
881                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
882 
883         newctrl = (newctrl & ~clear) | set;
884 
885         if (acm->ctrlout == newctrl)
886                 return 0;
887         return acm_set_control(acm, acm->ctrlout = newctrl);
888 }
889 
890 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
891 {
892         struct serial_struct tmp;
893 
894         if (!info)
895                 return -EINVAL;
896 
897         memset(&tmp, 0, sizeof(tmp));
898         tmp.flags = ASYNC_LOW_LATENCY;
899         tmp.xmit_fifo_size = acm->writesize;
900         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
901         tmp.close_delay = acm->port.close_delay / 10;
902         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
903                                 ASYNC_CLOSING_WAIT_NONE :
904                                 acm->port.closing_wait / 10;
905 
906         if (copy_to_user(info, &tmp, sizeof(tmp)))
907                 return -EFAULT;
908         else
909                 return 0;
910 }
911 
912 static int set_serial_info(struct acm *acm,
913                                 struct serial_struct __user *newinfo)
914 {
915         struct serial_struct new_serial;
916         unsigned int closing_wait, close_delay;
917         int retval = 0;
918 
919         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
920                 return -EFAULT;
921 
922         close_delay = new_serial.close_delay * 10;
923         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
924                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
925 
926         mutex_lock(&acm->port.mutex);
927 
928         if (!capable(CAP_SYS_ADMIN)) {
929                 if ((close_delay != acm->port.close_delay) ||
930                     (closing_wait != acm->port.closing_wait))
931                         retval = -EPERM;
932                 else
933                         retval = -EOPNOTSUPP;
934         } else {
935                 acm->port.close_delay  = close_delay;
936                 acm->port.closing_wait = closing_wait;
937         }
938 
939         mutex_unlock(&acm->port.mutex);
940         return retval;
941 }
942 
943 static int wait_serial_change(struct acm *acm, unsigned long arg)
944 {
945         int rv = 0;
946         DECLARE_WAITQUEUE(wait, current);
947         struct async_icount old, new;
948 
949         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD))
950                 return -EINVAL;
951         do {
952                 spin_lock_irq(&acm->read_lock);
953                 old = acm->oldcount;
954                 new = acm->iocount;
955                 acm->oldcount = new;
956                 spin_unlock_irq(&acm->read_lock);
957 
958                 if ((arg & TIOCM_DSR) &&
959                         old.dsr != new.dsr)
960                         break;
961                 if ((arg & TIOCM_CD)  &&
962                         old.dcd != new.dcd)
963                         break;
964                 if ((arg & TIOCM_RI) &&
965                         old.rng != new.rng)
966                         break;
967 
968                 add_wait_queue(&acm->wioctl, &wait);
969                 set_current_state(TASK_INTERRUPTIBLE);
970                 schedule();
971                 remove_wait_queue(&acm->wioctl, &wait);
972                 if (acm->disconnected) {
973                         if (arg & TIOCM_CD)
974                                 break;
975                         else
976                                 rv = -ENODEV;
977                 } else {
978                         if (signal_pending(current))
979                                 rv = -ERESTARTSYS;
980                 }
981         } while (!rv);
982 
983         
984 
985         return rv;
986 }
987 
988 static int get_serial_usage(struct acm *acm,
989                             struct serial_icounter_struct __user *count)
990 {
991         struct serial_icounter_struct icount;
992         int rv = 0;
993 
994         memset(&icount, 0, sizeof(icount));
995         icount.dsr = acm->iocount.dsr;
996         icount.rng = acm->iocount.rng;
997         icount.dcd = acm->iocount.dcd;
998         icount.frame = acm->iocount.frame;
999         icount.overrun = acm->iocount.overrun;
1000         icount.parity = acm->iocount.parity;
1001         icount.brk = acm->iocount.brk;
1002 
1003         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
1004                 rv = -EFAULT;
1005 
1006         return rv;
1007 }
1008 
1009 static int acm_tty_ioctl(struct tty_struct *tty,
1010                                         unsigned int cmd, unsigned long arg)
1011 {
1012         struct acm *acm = tty->driver_data;
1013         int rv = -ENOIOCTLCMD;
1014 
1015         switch (cmd) {
1016         case TIOCGSERIAL: /* gets serial port data */
1017                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
1018                 break;
1019         case TIOCSSERIAL:
1020                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
1021                 break;
1022         case TIOCMIWAIT:
1023                 rv = usb_autopm_get_interface(acm->control);
1024                 if (rv < 0) {
1025                         rv = -EIO;
1026                         break;
1027                 }
1028                 rv = wait_serial_change(acm, arg);
1029                 usb_autopm_put_interface(acm->control);
1030                 break;
1031         case TIOCGICOUNT:
1032                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
1033                 break;
1034         }
1035 
1036         return rv;
1037 }
1038 
1039 static void acm_tty_set_termios(struct tty_struct *tty,
1040                                                 struct ktermios *termios_old)
1041 {
1042         struct acm *acm = tty->driver_data;
1043         struct ktermios *termios = &tty->termios;
1044         struct usb_cdc_line_coding newline;
1045         int newctrl = acm->ctrlout;
1046 
1047         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1048         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1049         newline.bParityType = termios->c_cflag & PARENB ?
1050                                 (termios->c_cflag & PARODD ? 1 : 2) +
1051                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1052         switch (termios->c_cflag & CSIZE) {
1053         case CS5:
1054                 newline.bDataBits = 5;
1055                 break;
1056         case CS6:
1057                 newline.bDataBits = 6;
1058                 break;
1059         case CS7:
1060                 newline.bDataBits = 7;
1061                 break;
1062         case CS8:
1063         default:
1064                 newline.bDataBits = 8;
1065                 break;
1066         }
1067         /* FIXME: Needs to clear unsupported bits in the termios */
1068         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1069 
1070         if (C_BAUD(tty) == B0) {
1071                 newline.dwDTERate = acm->line.dwDTERate;
1072                 newctrl &= ~ACM_CTRL_DTR;
1073         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1074                 newctrl |=  ACM_CTRL_DTR;
1075         }
1076 
1077         if (newctrl != acm->ctrlout)
1078                 acm_set_control(acm, acm->ctrlout = newctrl);
1079 
1080         if (memcmp(&acm->line, &newline, sizeof newline)) {
1081                 memcpy(&acm->line, &newline, sizeof newline);
1082                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1083                         __func__,
1084                         le32_to_cpu(newline.dwDTERate),
1085                         newline.bCharFormat, newline.bParityType,
1086                         newline.bDataBits);
1087                 acm_set_line(acm, &acm->line);
1088         }
1089 }
1090 
1091 static const struct tty_port_operations acm_port_ops = {
1092         .dtr_rts = acm_port_dtr_rts,
1093         .shutdown = acm_port_shutdown,
1094         .activate = acm_port_activate,
1095         .destruct = acm_port_destruct,
1096 };
1097 
1098 /*
1099  * USB probe and disconnect routines.
1100  */
1101 
1102 /* Little helpers: write/read buffers free */
1103 static void acm_write_buffers_free(struct acm *acm)
1104 {
1105         int i;
1106         struct acm_wb *wb;
1107         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1108 
1109         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1110                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1111 }
1112 
1113 static void acm_read_buffers_free(struct acm *acm)
1114 {
1115         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1116         int i;
1117 
1118         for (i = 0; i < acm->rx_buflimit; i++)
1119                 usb_free_coherent(usb_dev, acm->readsize,
1120                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1121 }
1122 
1123 /* Little helper: write buffers allocate */
1124 static int acm_write_buffers_alloc(struct acm *acm)
1125 {
1126         int i;
1127         struct acm_wb *wb;
1128 
1129         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1130                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1131                     &wb->dmah);
1132                 if (!wb->buf) {
1133                         while (i != 0) {
1134                                 --i;
1135                                 --wb;
1136                                 usb_free_coherent(acm->dev, acm->writesize,
1137                                     wb->buf, wb->dmah);
1138                         }
1139                         return -ENOMEM;
1140                 }
1141         }
1142         return 0;
1143 }
1144 
1145 static int acm_probe(struct usb_interface *intf,
1146                      const struct usb_device_id *id)
1147 {
1148         struct usb_cdc_union_desc *union_header = NULL;
1149         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1150         unsigned char *buffer = intf->altsetting->extra;
1151         int buflen = intf->altsetting->extralen;
1152         struct usb_interface *control_interface;
1153         struct usb_interface *data_interface;
1154         struct usb_endpoint_descriptor *epctrl = NULL;
1155         struct usb_endpoint_descriptor *epread = NULL;
1156         struct usb_endpoint_descriptor *epwrite = NULL;
1157         struct usb_device *usb_dev = interface_to_usbdev(intf);
1158         struct usb_cdc_parsed_header h;
1159         struct acm *acm;
1160         int minor;
1161         int ctrlsize, readsize;
1162         u8 *buf;
1163         int call_intf_num = -1;
1164         int data_intf_num = -1;
1165         unsigned long quirks;
1166         int num_rx_buf;
1167         int i;
1168         int combined_interfaces = 0;
1169         struct device *tty_dev;
1170         int rv = -ENOMEM;
1171 
1172         /* normal quirks */
1173         quirks = (unsigned long)id->driver_info;
1174 
1175         if (quirks == IGNORE_DEVICE)
1176                 return -ENODEV;
1177 
1178         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1179 
1180         /* handle quirks deadly to normal probing*/
1181         if (quirks == NO_UNION_NORMAL) {
1182                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1183                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1184                 /* we would crash */
1185                 if (!data_interface || !control_interface)
1186                         return -ENODEV;
1187                 goto skip_normal_probe;
1188         }
1189 
1190         /* normal probing*/
1191         if (!buffer) {
1192                 dev_err(&intf->dev, "Weird descriptor references\n");
1193                 return -EINVAL;
1194         }
1195 
1196         if (!buflen) {
1197                 if (intf->cur_altsetting->endpoint &&
1198                                 intf->cur_altsetting->endpoint->extralen &&
1199                                 intf->cur_altsetting->endpoint->extra) {
1200                         dev_dbg(&intf->dev,
1201                                 "Seeking extra descriptors on endpoint\n");
1202                         buflen = intf->cur_altsetting->endpoint->extralen;
1203                         buffer = intf->cur_altsetting->endpoint->extra;
1204                 } else {
1205                         dev_err(&intf->dev,
1206                                 "Zero length descriptor references\n");
1207                         return -EINVAL;
1208                 }
1209         }
1210 
1211         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1212         union_header = h.usb_cdc_union_desc;
1213         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1214         if (cmgmd)
1215                 call_intf_num = cmgmd->bDataInterface;
1216 
1217         if (!union_header) {
1218                 if (call_intf_num > 0) {
1219                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1220                         /* quirks for Droids MuIn LCD */
1221                         if (quirks & NO_DATA_INTERFACE) {
1222                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1223                         } else {
1224                                 data_intf_num = call_intf_num;
1225                                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1226                         }
1227                         control_interface = intf;
1228                 } else {
1229                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1230                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1231                                 return -ENODEV;
1232                         } else {
1233                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1234                                 combined_interfaces = 1;
1235                                 control_interface = data_interface = intf;
1236                                 goto look_for_collapsed_interface;
1237                         }
1238                 }
1239         } else {
1240                 data_intf_num = union_header->bSlaveInterface0;
1241                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1242                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1243         }
1244 
1245         if (!control_interface || !data_interface) {
1246                 dev_dbg(&intf->dev, "no interfaces\n");
1247                 return -ENODEV;
1248         }
1249 
1250         if (data_intf_num != call_intf_num)
1251                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1252 
1253         if (control_interface == data_interface) {
1254                 /* some broken devices designed for windows work this way */
1255                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1256                 combined_interfaces = 1;
1257                 /* a popular other OS doesn't use it */
1258                 quirks |= NO_CAP_LINE;
1259                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1260                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1261                         return -EINVAL;
1262                 }
1263 look_for_collapsed_interface:
1264                 for (i = 0; i < 3; i++) {
1265                         struct usb_endpoint_descriptor *ep;
1266                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1267 
1268                         if (usb_endpoint_is_int_in(ep))
1269                                 epctrl = ep;
1270                         else if (usb_endpoint_is_bulk_out(ep))
1271                                 epwrite = ep;
1272                         else if (usb_endpoint_is_bulk_in(ep))
1273                                 epread = ep;
1274                         else
1275                                 return -EINVAL;
1276                 }
1277                 if (!epctrl || !epread || !epwrite)
1278                         return -ENODEV;
1279                 else
1280                         goto made_compressed_probe;
1281         }
1282 
1283 skip_normal_probe:
1284 
1285         /*workaround for switched interfaces */
1286         if (data_interface->cur_altsetting->desc.bInterfaceClass
1287                                                 != CDC_DATA_INTERFACE_TYPE) {
1288                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1289                                                 == CDC_DATA_INTERFACE_TYPE) {
1290                         dev_dbg(&intf->dev,
1291                                 "Your device has switched interfaces.\n");
1292                         swap(control_interface, data_interface);
1293                 } else {
1294                         return -EINVAL;
1295                 }
1296         }
1297 
1298         /* Accept probe requests only for the control interface */
1299         if (!combined_interfaces && intf != control_interface)
1300                 return -ENODEV;
1301 
1302         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1303                 /* valid in this context */
1304                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1305                 return -EBUSY;
1306         }
1307 
1308 
1309         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1310             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1311                 return -EINVAL;
1312 
1313         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1314         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1315         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1316 
1317 
1318         /* workaround for switched endpoints */
1319         if (!usb_endpoint_dir_in(epread)) {
1320                 /* descriptors are swapped */
1321                 dev_dbg(&intf->dev,
1322                         "The data interface has switched endpoints\n");
1323                 swap(epread, epwrite);
1324         }
1325 made_compressed_probe:
1326         dev_dbg(&intf->dev, "interfaces are valid\n");
1327 
1328         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1329         if (acm == NULL)
1330                 goto alloc_fail;
1331 
1332         minor = acm_alloc_minor(acm);
1333         if (minor < 0)
1334                 goto alloc_fail1;
1335 
1336         ctrlsize = usb_endpoint_maxp(epctrl);
1337         readsize = usb_endpoint_maxp(epread) *
1338                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1339         acm->combined_interfaces = combined_interfaces;
1340         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1341         acm->control = control_interface;
1342         acm->data = data_interface;
1343         acm->minor = minor;
1344         acm->dev = usb_dev;
1345         if (h.usb_cdc_acm_descriptor)
1346                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1347         if (quirks & NO_CAP_LINE)
1348                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1349         acm->ctrlsize = ctrlsize;
1350         acm->readsize = readsize;
1351         acm->rx_buflimit = num_rx_buf;
1352         INIT_WORK(&acm->work, acm_softint);
1353         init_waitqueue_head(&acm->wioctl);
1354         spin_lock_init(&acm->write_lock);
1355         spin_lock_init(&acm->read_lock);
1356         mutex_init(&acm->mutex);
1357         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1358         if (acm->is_int_ep)
1359                 acm->bInterval = epread->bInterval;
1360         tty_port_init(&acm->port);
1361         acm->port.ops = &acm_port_ops;
1362         init_usb_anchor(&acm->delayed);
1363         acm->quirks = quirks;
1364 
1365         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1366         if (!buf)
1367                 goto alloc_fail2;
1368         acm->ctrl_buffer = buf;
1369 
1370         if (acm_write_buffers_alloc(acm) < 0)
1371                 goto alloc_fail4;
1372 
1373         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1374         if (!acm->ctrlurb)
1375                 goto alloc_fail5;
1376 
1377         for (i = 0; i < num_rx_buf; i++) {
1378                 struct acm_rb *rb = &(acm->read_buffers[i]);
1379                 struct urb *urb;
1380 
1381                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1382                                                                 &rb->dma);
1383                 if (!rb->base)
1384                         goto alloc_fail6;
1385                 rb->index = i;
1386                 rb->instance = acm;
1387 
1388                 urb = usb_alloc_urb(0, GFP_KERNEL);
1389                 if (!urb)
1390                         goto alloc_fail6;
1391 
1392                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1393                 urb->transfer_dma = rb->dma;
1394                 if (acm->is_int_ep) {
1395                         usb_fill_int_urb(urb, acm->dev,
1396                                          usb_rcvintpipe(usb_dev, epread->bEndpointAddress),
1397                                          rb->base,
1398                                          acm->readsize,
1399                                          acm_read_bulk_callback, rb,
1400                                          acm->bInterval);
1401                 } else {
1402                         usb_fill_bulk_urb(urb, acm->dev,
1403                                           usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress),
1404                                           rb->base,
1405                                           acm->readsize,
1406                                           acm_read_bulk_callback, rb);
1407                 }
1408 
1409                 acm->read_urbs[i] = urb;
1410                 __set_bit(i, &acm->read_urbs_free);
1411         }
1412         for (i = 0; i < ACM_NW; i++) {
1413                 struct acm_wb *snd = &(acm->wb[i]);
1414 
1415                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1416                 if (snd->urb == NULL)
1417                         goto alloc_fail7;
1418 
1419                 if (usb_endpoint_xfer_int(epwrite))
1420                         usb_fill_int_urb(snd->urb, usb_dev,
1421                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1422                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1423                 else
1424                         usb_fill_bulk_urb(snd->urb, usb_dev,
1425                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1426                                 NULL, acm->writesize, acm_write_bulk, snd);
1427                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1428                 if (quirks & SEND_ZERO_PACKET)
1429                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1430                 snd->instance = acm;
1431         }
1432 
1433         usb_set_intfdata(intf, acm);
1434 
1435         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1436         if (i < 0)
1437                 goto alloc_fail7;
1438 
1439         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1440                 struct usb_cdc_country_functional_desc * cfd =
1441                                         h.usb_cdc_country_functional_desc;
1442 
1443                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1444                 if (!acm->country_codes)
1445                         goto skip_countries;
1446                 acm->country_code_size = cfd->bLength - 4;
1447                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1448                                                         cfd->bLength - 4);
1449                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1450 
1451                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1452                 if (i < 0) {
1453                         kfree(acm->country_codes);
1454                         acm->country_codes = NULL;
1455                         acm->country_code_size = 0;
1456                         goto skip_countries;
1457                 }
1458 
1459                 i = device_create_file(&intf->dev,
1460                                                 &dev_attr_iCountryCodeRelDate);
1461                 if (i < 0) {
1462                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1463                         kfree(acm->country_codes);
1464                         acm->country_codes = NULL;
1465                         acm->country_code_size = 0;
1466                         goto skip_countries;
1467                 }
1468         }
1469 
1470 skip_countries:
1471         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1472                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1473                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1474                          /* works around buggy devices */
1475                          epctrl->bInterval ? epctrl->bInterval : 16);
1476         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1477         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1478 
1479         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1480 
1481         acm->line.dwDTERate = cpu_to_le32(9600);
1482         acm->line.bDataBits = 8;
1483         acm_set_line(acm, &acm->line);
1484 
1485         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1486         usb_set_intfdata(data_interface, acm);
1487 
1488         usb_get_intf(control_interface);
1489         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1490                         &control_interface->dev);
1491         if (IS_ERR(tty_dev)) {
1492                 rv = PTR_ERR(tty_dev);
1493                 goto alloc_fail8;
1494         }
1495 
1496         if (quirks & CLEAR_HALT_CONDITIONS) {
1497                 usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress));
1498                 usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress));
1499         }
1500 
1501         return 0;
1502 alloc_fail8:
1503         if (acm->country_codes) {
1504                 device_remove_file(&acm->control->dev,
1505                                 &dev_attr_wCountryCodes);
1506                 device_remove_file(&acm->control->dev,
1507                                 &dev_attr_iCountryCodeRelDate);
1508                 kfree(acm->country_codes);
1509         }
1510         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1511 alloc_fail7:
1512         usb_set_intfdata(intf, NULL);
1513         for (i = 0; i < ACM_NW; i++)
1514                 usb_free_urb(acm->wb[i].urb);
1515 alloc_fail6:
1516         for (i = 0; i < num_rx_buf; i++)
1517                 usb_free_urb(acm->read_urbs[i]);
1518         acm_read_buffers_free(acm);
1519         usb_free_urb(acm->ctrlurb);
1520 alloc_fail5:
1521         acm_write_buffers_free(acm);
1522 alloc_fail4:
1523         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1524 alloc_fail2:
1525         acm_release_minor(acm);
1526 alloc_fail1:
1527         kfree(acm);
1528 alloc_fail:
1529         return rv;
1530 }
1531 
1532 static void stop_data_traffic(struct acm *acm)
1533 {
1534         int i;
1535 
1536         dev_dbg(&acm->control->dev, "%s\n", __func__);
1537 
1538         usb_kill_urb(acm->ctrlurb);
1539         for (i = 0; i < ACM_NW; i++)
1540                 usb_kill_urb(acm->wb[i].urb);
1541         for (i = 0; i < acm->rx_buflimit; i++)
1542                 usb_kill_urb(acm->read_urbs[i]);
1543 
1544         cancel_work_sync(&acm->work);
1545 }
1546 
1547 static void acm_disconnect(struct usb_interface *intf)
1548 {
1549         struct acm *acm = usb_get_intfdata(intf);
1550         struct usb_device *usb_dev = interface_to_usbdev(intf);
1551         struct tty_struct *tty;
1552         int i;
1553 
1554         dev_dbg(&intf->dev, "%s\n", __func__);
1555 
1556         /* sibling interface is already cleaning up */
1557         if (!acm)
1558                 return;
1559 
1560         mutex_lock(&acm->mutex);
1561         acm->disconnected = true;
1562         if (acm->country_codes) {
1563                 device_remove_file(&acm->control->dev,
1564                                 &dev_attr_wCountryCodes);
1565                 device_remove_file(&acm->control->dev,
1566                                 &dev_attr_iCountryCodeRelDate);
1567         }
1568         wake_up_all(&acm->wioctl);
1569         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1570         usb_set_intfdata(acm->control, NULL);
1571         usb_set_intfdata(acm->data, NULL);
1572         mutex_unlock(&acm->mutex);
1573 
1574         tty = tty_port_tty_get(&acm->port);
1575         if (tty) {
1576                 tty_vhangup(tty);
1577                 tty_kref_put(tty);
1578         }
1579 
1580         stop_data_traffic(acm);
1581 
1582         tty_unregister_device(acm_tty_driver, acm->minor);
1583 
1584         usb_free_urb(acm->ctrlurb);
1585         for (i = 0; i < ACM_NW; i++)
1586                 usb_free_urb(acm->wb[i].urb);
1587         for (i = 0; i < acm->rx_buflimit; i++)
1588                 usb_free_urb(acm->read_urbs[i]);
1589         acm_write_buffers_free(acm);
1590         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1591         acm_read_buffers_free(acm);
1592 
1593         if (!acm->combined_interfaces)
1594                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1595                                         acm->data : acm->control);
1596 
1597         tty_port_put(&acm->port);
1598 }
1599 
1600 #ifdef CONFIG_PM
1601 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1602 {
1603         struct acm *acm = usb_get_intfdata(intf);
1604         int cnt;
1605 
1606         spin_lock_irq(&acm->write_lock);
1607         if (PMSG_IS_AUTO(message)) {
1608                 if (acm->transmitting) {
1609                         spin_unlock_irq(&acm->write_lock);
1610                         return -EBUSY;
1611                 }
1612         }
1613         cnt = acm->susp_count++;
1614         spin_unlock_irq(&acm->write_lock);
1615 
1616         if (cnt)
1617                 return 0;
1618 
1619         stop_data_traffic(acm);
1620 
1621         return 0;
1622 }
1623 
1624 static int acm_resume(struct usb_interface *intf)
1625 {
1626         struct acm *acm = usb_get_intfdata(intf);
1627         struct urb *urb;
1628         int rv = 0;
1629 
1630         spin_lock_irq(&acm->write_lock);
1631 
1632         if (--acm->susp_count)
1633                 goto out;
1634 
1635         if (tty_port_initialized(&acm->port)) {
1636                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1637 
1638                 for (;;) {
1639                         urb = usb_get_from_anchor(&acm->delayed);
1640                         if (!urb)
1641                                 break;
1642 
1643                         acm_start_wb(acm, urb->context);
1644                 }
1645 
1646                 /*
1647                  * delayed error checking because we must
1648                  * do the write path at all cost
1649                  */
1650                 if (rv < 0)
1651                         goto out;
1652 
1653                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1654         }
1655 out:
1656         spin_unlock_irq(&acm->write_lock);
1657 
1658         return rv;
1659 }
1660 
1661 static int acm_reset_resume(struct usb_interface *intf)
1662 {
1663         struct acm *acm = usb_get_intfdata(intf);
1664 
1665         if (tty_port_initialized(&acm->port))
1666                 tty_port_tty_hangup(&acm->port, false);
1667 
1668         return acm_resume(intf);
1669 }
1670 
1671 #endif /* CONFIG_PM */
1672 
1673 #define NOKIA_PCSUITE_ACM_INFO(x) \
1674                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1675                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1676                 USB_CDC_ACM_PROTO_VENDOR)
1677 
1678 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1679                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1680                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1681                 USB_CDC_ACM_PROTO_VENDOR)
1682 
1683 /*
1684  * USB driver structure.
1685  */
1686 
1687 static const struct usb_device_id acm_ids[] = {
1688         /* quirky and broken devices */
1689         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1690         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1691         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1692         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1693         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1694         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1695         },
1696         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1697         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1698         },
1699         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1700         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1701         },
1702         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1703         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1704         },
1705         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1706         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1707         },
1708         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1709         .driver_info = SINGLE_RX_URB,
1710         },
1711         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1712         .driver_info = SINGLE_RX_URB, /* firmware bug */
1713         },
1714         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1715         .driver_info = SINGLE_RX_URB, /* firmware bug */
1716         },
1717         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1718         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1719         },
1720         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1721         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1722         },
1723         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1724         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1725         },
1726         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1727         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1728         },
1729         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1730         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1731         },
1732         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1733         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1734         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1735         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1736         },
1737         /* Motorola H24 HSPA module: */
1738         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1739         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1740         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1741         },
1742         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1743         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1744         },
1745         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1746         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1747         },
1748         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1749         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1750         },
1751         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1752         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1753         },
1754         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1755         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1756         },
1757         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1758         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1759         },
1760 
1761         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1762         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1763                                            data interface instead of
1764                                            communications interface.
1765                                            Maybe we should define a new
1766                                            quirk for this. */
1767         },
1768         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1769         .driver_info = NO_UNION_NORMAL,
1770         },
1771         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1772         .driver_info = NO_UNION_NORMAL,
1773         },
1774         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1775         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1776         },
1777         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1778         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1779         },
1780 
1781         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1782         .driver_info = CLEAR_HALT_CONDITIONS,
1783         },
1784 
1785         /* Nokia S60 phones expose two ACM channels. The first is
1786          * a modem and is picked up by the standard AT-command
1787          * information below. The second is 'vendor-specific' but
1788          * is treated as a serial device at the S60 end, so we want
1789          * to expose it on Linux too. */
1790         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1791         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1792         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1793         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1794         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1795         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1796         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1797         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1798         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1799         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1800         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1801         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1802         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1803         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1804         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1805         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1806         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1807         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1808         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1809         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1810         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1811         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1812         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1813         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1814         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1815         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1816         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1817         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1818         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1819         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1820         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1821         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1822         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1823         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1824         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1825         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1826         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1827         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1828         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1829         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1830         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1831         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1832         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1833         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1834         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1835         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1836         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1837         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1838         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1839         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1840         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1841         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1842         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1843         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1844         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1845         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1846         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1847         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1848 
1849         /* Support for Owen devices */
1850         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1851 
1852         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1853 
1854         /* Support for Droids MuIn LCD */
1855         { USB_DEVICE(0x04d8, 0x000b),
1856         .driver_info = NO_DATA_INTERFACE,
1857         },
1858 
1859 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1860         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1861         .driver_info = IGNORE_DEVICE,
1862         },
1863         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1864         .driver_info = IGNORE_DEVICE,
1865         },
1866 #endif
1867 
1868         /*Samsung phone in firmware update mode */
1869         { USB_DEVICE(0x04e8, 0x685d),
1870         .driver_info = IGNORE_DEVICE,
1871         },
1872 
1873         /* Exclude Infineon Flash Loader utility */
1874         { USB_DEVICE(0x058b, 0x0041),
1875         .driver_info = IGNORE_DEVICE,
1876         },
1877 
1878         /* control interfaces without any protocol set */
1879         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1880                 USB_CDC_PROTO_NONE) },
1881 
1882         /* control interfaces with various AT-command sets */
1883         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1884                 USB_CDC_ACM_PROTO_AT_V25TER) },
1885         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1886                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1887         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1888                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1889         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1890                 USB_CDC_ACM_PROTO_AT_GSM) },
1891         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1892                 USB_CDC_ACM_PROTO_AT_3G) },
1893         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1894                 USB_CDC_ACM_PROTO_AT_CDMA) },
1895 
1896         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1897         .driver_info = SEND_ZERO_PACKET,
1898         },
1899 
1900         { }
1901 };
1902 
1903 MODULE_DEVICE_TABLE(usb, acm_ids);
1904 
1905 static struct usb_driver acm_driver = {
1906         .name =         "cdc_acm",
1907         .probe =        acm_probe,
1908         .disconnect =   acm_disconnect,
1909 #ifdef CONFIG_PM
1910         .suspend =      acm_suspend,
1911         .resume =       acm_resume,
1912         .reset_resume = acm_reset_resume,
1913 #endif
1914         .id_table =     acm_ids,
1915 #ifdef CONFIG_PM
1916         .supports_autosuspend = 1,
1917 #endif
1918         .disable_hub_initiated_lpm = 1,
1919 };
1920 
1921 /*
1922  * TTY driver structures.
1923  */
1924 
1925 static const struct tty_operations acm_ops = {
1926         .install =              acm_tty_install,
1927         .open =                 acm_tty_open,
1928         .close =                acm_tty_close,
1929         .cleanup =              acm_tty_cleanup,
1930         .hangup =               acm_tty_hangup,
1931         .write =                acm_tty_write,
1932         .put_char =             acm_tty_put_char,
1933         .flush_chars =          acm_tty_flush_chars,
1934         .write_room =           acm_tty_write_room,
1935         .ioctl =                acm_tty_ioctl,
1936         .throttle =             acm_tty_throttle,
1937         .unthrottle =           acm_tty_unthrottle,
1938         .chars_in_buffer =      acm_tty_chars_in_buffer,
1939         .break_ctl =            acm_tty_break_ctl,
1940         .set_termios =          acm_tty_set_termios,
1941         .tiocmget =             acm_tty_tiocmget,
1942         .tiocmset =             acm_tty_tiocmset,
1943 };
1944 
1945 /*
1946  * Init / exit.
1947  */
1948 
1949 static int __init acm_init(void)
1950 {
1951         int retval;
1952         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1953         if (!acm_tty_driver)
1954                 return -ENOMEM;
1955         acm_tty_driver->driver_name = "acm",
1956         acm_tty_driver->name = "ttyACM",
1957         acm_tty_driver->major = ACM_TTY_MAJOR,
1958         acm_tty_driver->minor_start = 0,
1959         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1960         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1961         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1962         acm_tty_driver->init_termios = tty_std_termios;
1963         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1964                                                                 HUPCL | CLOCAL;
1965         tty_set_operations(acm_tty_driver, &acm_ops);
1966 
1967         retval = tty_register_driver(acm_tty_driver);
1968         if (retval) {
1969                 put_tty_driver(acm_tty_driver);
1970                 return retval;
1971         }
1972 
1973         retval = usb_register(&acm_driver);
1974         if (retval) {
1975                 tty_unregister_driver(acm_tty_driver);
1976                 put_tty_driver(acm_tty_driver);
1977                 return retval;
1978         }
1979 
1980         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1981 
1982         return 0;
1983 }
1984 
1985 static void __exit acm_exit(void)
1986 {
1987         usb_deregister(&acm_driver);
1988         tty_unregister_driver(acm_tty_driver);
1989         put_tty_driver(acm_tty_driver);
1990         idr_destroy(&acm_minors);
1991 }
1992 
1993 module_init(acm_init);
1994 module_exit(acm_exit);
1995 
1996 MODULE_AUTHOR(DRIVER_AUTHOR);
1997 MODULE_DESCRIPTION(DRIVER_DESC);
1998 MODULE_LICENSE("GPL");
1999 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
2000 

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