xref: /openbmc/linux/drivers/usb/class/cdc-acm.c (revision b34e08d5)
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 /*
64  * acm_table accessors
65  */
66 
67 /*
68  * Look up an ACM structure by index. If found and not disconnected, increment
69  * its refcount and return it with its mutex held.
70  */
71 static struct acm *acm_get_by_index(unsigned index)
72 {
73 	struct acm *acm;
74 
75 	mutex_lock(&acm_table_lock);
76 	acm = acm_table[index];
77 	if (acm) {
78 		mutex_lock(&acm->mutex);
79 		if (acm->disconnected) {
80 			mutex_unlock(&acm->mutex);
81 			acm = NULL;
82 		} else {
83 			tty_port_get(&acm->port);
84 			mutex_unlock(&acm->mutex);
85 		}
86 	}
87 	mutex_unlock(&acm_table_lock);
88 	return acm;
89 }
90 
91 /*
92  * Try to find an available minor number and if found, associate it with 'acm'.
93  */
94 static int acm_alloc_minor(struct acm *acm)
95 {
96 	int minor;
97 
98 	mutex_lock(&acm_table_lock);
99 	for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
100 		if (!acm_table[minor]) {
101 			acm_table[minor] = acm;
102 			break;
103 		}
104 	}
105 	mutex_unlock(&acm_table_lock);
106 
107 	return minor;
108 }
109 
110 /* Release the minor number associated with 'acm'.  */
111 static void acm_release_minor(struct acm *acm)
112 {
113 	mutex_lock(&acm_table_lock);
114 	acm_table[acm->minor] = NULL;
115 	mutex_unlock(&acm_table_lock);
116 }
117 
118 /*
119  * Functions for ACM control messages.
120  */
121 
122 static int acm_ctrl_msg(struct acm *acm, int request, int value,
123 							void *buf, int len)
124 {
125 	int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
126 		request, USB_RT_ACM, value,
127 		acm->control->altsetting[0].desc.bInterfaceNumber,
128 		buf, len, 5000);
129 	dev_dbg(&acm->control->dev,
130 			"%s - rq 0x%02x, val %#x, len %#x, result %d\n",
131 			__func__, request, value, len, retval);
132 	return retval < 0 ? retval : 0;
133 }
134 
135 /* devices aren't required to support these requests.
136  * the cdc acm descriptor tells whether they do...
137  */
138 #define acm_set_control(acm, control) \
139 	acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
140 #define acm_set_line(acm, line) \
141 	acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
142 #define acm_send_break(acm, ms) \
143 	acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
144 
145 /*
146  * Write buffer management.
147  * All of these assume proper locks taken by the caller.
148  */
149 
150 static int acm_wb_alloc(struct acm *acm)
151 {
152 	int i, wbn;
153 	struct acm_wb *wb;
154 
155 	wbn = 0;
156 	i = 0;
157 	for (;;) {
158 		wb = &acm->wb[wbn];
159 		if (!wb->use) {
160 			wb->use = 1;
161 			return wbn;
162 		}
163 		wbn = (wbn + 1) % ACM_NW;
164 		if (++i >= ACM_NW)
165 			return -1;
166 	}
167 }
168 
169 static int acm_wb_is_avail(struct acm *acm)
170 {
171 	int i, n;
172 	unsigned long flags;
173 
174 	n = ACM_NW;
175 	spin_lock_irqsave(&acm->write_lock, flags);
176 	for (i = 0; i < ACM_NW; i++)
177 		n -= acm->wb[i].use;
178 	spin_unlock_irqrestore(&acm->write_lock, flags);
179 	return n;
180 }
181 
182 /*
183  * Finish write. Caller must hold acm->write_lock
184  */
185 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
186 {
187 	wb->use = 0;
188 	acm->transmitting--;
189 	usb_autopm_put_interface_async(acm->control);
190 }
191 
192 /*
193  * Poke write.
194  *
195  * the caller is responsible for locking
196  */
197 
198 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
199 {
200 	int rc;
201 
202 	acm->transmitting++;
203 
204 	wb->urb->transfer_buffer = wb->buf;
205 	wb->urb->transfer_dma = wb->dmah;
206 	wb->urb->transfer_buffer_length = wb->len;
207 	wb->urb->dev = acm->dev;
208 
209 	rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
210 	if (rc < 0) {
211 		dev_err(&acm->data->dev,
212 			"%s - usb_submit_urb(write bulk) failed: %d\n",
213 			__func__, rc);
214 		acm_write_done(acm, wb);
215 	}
216 	return rc;
217 }
218 
219 /*
220  * attributes exported through sysfs
221  */
222 static ssize_t show_caps
223 (struct device *dev, struct device_attribute *attr, char *buf)
224 {
225 	struct usb_interface *intf = to_usb_interface(dev);
226 	struct acm *acm = usb_get_intfdata(intf);
227 
228 	return sprintf(buf, "%d", acm->ctrl_caps);
229 }
230 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
231 
232 static ssize_t show_country_codes
233 (struct device *dev, struct device_attribute *attr, char *buf)
234 {
235 	struct usb_interface *intf = to_usb_interface(dev);
236 	struct acm *acm = usb_get_intfdata(intf);
237 
238 	memcpy(buf, acm->country_codes, acm->country_code_size);
239 	return acm->country_code_size;
240 }
241 
242 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
243 
244 static ssize_t show_country_rel_date
245 (struct device *dev, struct device_attribute *attr, char *buf)
246 {
247 	struct usb_interface *intf = to_usb_interface(dev);
248 	struct acm *acm = usb_get_intfdata(intf);
249 
250 	return sprintf(buf, "%d", acm->country_rel_date);
251 }
252 
253 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
254 /*
255  * Interrupt handlers for various ACM device responses
256  */
257 
258 /* control interface reports status changes with "interrupt" transfers */
259 static void acm_ctrl_irq(struct urb *urb)
260 {
261 	struct acm *acm = urb->context;
262 	struct usb_cdc_notification *dr = urb->transfer_buffer;
263 	unsigned char *data;
264 	int newctrl;
265 	int difference;
266 	int retval;
267 	int status = urb->status;
268 
269 	switch (status) {
270 	case 0:
271 		/* success */
272 		break;
273 	case -ECONNRESET:
274 	case -ENOENT:
275 	case -ESHUTDOWN:
276 		/* this urb is terminated, clean up */
277 		dev_dbg(&acm->control->dev,
278 				"%s - urb shutting down with status: %d\n",
279 				__func__, status);
280 		return;
281 	default:
282 		dev_dbg(&acm->control->dev,
283 				"%s - nonzero urb status received: %d\n",
284 				__func__, status);
285 		goto exit;
286 	}
287 
288 	usb_mark_last_busy(acm->dev);
289 
290 	data = (unsigned char *)(dr + 1);
291 	switch (dr->bNotificationType) {
292 	case USB_CDC_NOTIFY_NETWORK_CONNECTION:
293 		dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
294 							__func__, dr->wValue);
295 		break;
296 
297 	case USB_CDC_NOTIFY_SERIAL_STATE:
298 		newctrl = get_unaligned_le16(data);
299 
300 		if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
301 			dev_dbg(&acm->control->dev, "%s - calling hangup\n",
302 					__func__);
303 			tty_port_tty_hangup(&acm->port, false);
304 		}
305 
306 		difference = acm->ctrlin ^ newctrl;
307 		spin_lock(&acm->read_lock);
308 		acm->ctrlin = newctrl;
309 		acm->oldcount = acm->iocount;
310 
311 		if (difference & ACM_CTRL_DSR)
312 			acm->iocount.dsr++;
313 		if (difference & ACM_CTRL_BRK)
314 			acm->iocount.brk++;
315 		if (difference & ACM_CTRL_RI)
316 			acm->iocount.rng++;
317 		if (difference & ACM_CTRL_DCD)
318 			acm->iocount.dcd++;
319 		if (difference & ACM_CTRL_FRAMING)
320 			acm->iocount.frame++;
321 		if (difference & ACM_CTRL_PARITY)
322 			acm->iocount.parity++;
323 		if (difference & ACM_CTRL_OVERRUN)
324 			acm->iocount.overrun++;
325 		spin_unlock(&acm->read_lock);
326 
327 		if (difference)
328 			wake_up_all(&acm->wioctl);
329 
330 		break;
331 
332 	default:
333 		dev_dbg(&acm->control->dev,
334 			"%s - unknown notification %d received: index %d "
335 			"len %d data0 %d data1 %d\n",
336 			__func__,
337 			dr->bNotificationType, dr->wIndex,
338 			dr->wLength, data[0], data[1]);
339 		break;
340 	}
341 exit:
342 	retval = usb_submit_urb(urb, GFP_ATOMIC);
343 	if (retval)
344 		dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
345 							__func__, retval);
346 }
347 
348 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
349 {
350 	int res;
351 
352 	if (!test_and_clear_bit(index, &acm->read_urbs_free))
353 		return 0;
354 
355 	dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
356 
357 	res = usb_submit_urb(acm->read_urbs[index], mem_flags);
358 	if (res) {
359 		if (res != -EPERM) {
360 			dev_err(&acm->data->dev,
361 					"%s - usb_submit_urb failed: %d\n",
362 					__func__, res);
363 		}
364 		set_bit(index, &acm->read_urbs_free);
365 		return res;
366 	}
367 
368 	return 0;
369 }
370 
371 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
372 {
373 	int res;
374 	int i;
375 
376 	for (i = 0; i < acm->rx_buflimit; ++i) {
377 		res = acm_submit_read_urb(acm, i, mem_flags);
378 		if (res)
379 			return res;
380 	}
381 
382 	return 0;
383 }
384 
385 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
386 {
387 	if (!urb->actual_length)
388 		return;
389 
390 	tty_insert_flip_string(&acm->port, urb->transfer_buffer,
391 			urb->actual_length);
392 	tty_flip_buffer_push(&acm->port);
393 }
394 
395 static void acm_read_bulk_callback(struct urb *urb)
396 {
397 	struct acm_rb *rb = urb->context;
398 	struct acm *acm = rb->instance;
399 	unsigned long flags;
400 
401 	dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
402 					rb->index, urb->actual_length);
403 	set_bit(rb->index, &acm->read_urbs_free);
404 
405 	if (!acm->dev) {
406 		dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
407 		return;
408 	}
409 	usb_mark_last_busy(acm->dev);
410 
411 	if (urb->status) {
412 		dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
413 							__func__, urb->status);
414 		return;
415 	}
416 	acm_process_read_urb(acm, urb);
417 
418 	/* throttle device if requested by tty */
419 	spin_lock_irqsave(&acm->read_lock, flags);
420 	acm->throttled = acm->throttle_req;
421 	if (!acm->throttled && !acm->susp_count) {
422 		spin_unlock_irqrestore(&acm->read_lock, flags);
423 		acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
424 	} else {
425 		spin_unlock_irqrestore(&acm->read_lock, flags);
426 	}
427 }
428 
429 /* data interface wrote those outgoing bytes */
430 static void acm_write_bulk(struct urb *urb)
431 {
432 	struct acm_wb *wb = urb->context;
433 	struct acm *acm = wb->instance;
434 	unsigned long flags;
435 
436 	if (urb->status	|| (urb->actual_length != urb->transfer_buffer_length))
437 		dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
438 			__func__,
439 			urb->actual_length,
440 			urb->transfer_buffer_length,
441 			urb->status);
442 
443 	spin_lock_irqsave(&acm->write_lock, flags);
444 	acm_write_done(acm, wb);
445 	spin_unlock_irqrestore(&acm->write_lock, flags);
446 	schedule_work(&acm->work);
447 }
448 
449 static void acm_softint(struct work_struct *work)
450 {
451 	struct acm *acm = container_of(work, struct acm, work);
452 
453 	dev_vdbg(&acm->data->dev, "%s\n", __func__);
454 
455 	tty_port_tty_wakeup(&acm->port);
456 }
457 
458 /*
459  * TTY handlers
460  */
461 
462 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
463 {
464 	struct acm *acm;
465 	int retval;
466 
467 	dev_dbg(tty->dev, "%s\n", __func__);
468 
469 	acm = acm_get_by_index(tty->index);
470 	if (!acm)
471 		return -ENODEV;
472 
473 	retval = tty_standard_install(driver, tty);
474 	if (retval)
475 		goto error_init_termios;
476 
477 	tty->driver_data = acm;
478 
479 	return 0;
480 
481 error_init_termios:
482 	tty_port_put(&acm->port);
483 	return retval;
484 }
485 
486 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
487 {
488 	struct acm *acm = tty->driver_data;
489 
490 	dev_dbg(tty->dev, "%s\n", __func__);
491 
492 	return tty_port_open(&acm->port, tty, filp);
493 }
494 
495 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
496 {
497 	struct acm *acm = container_of(port, struct acm, port);
498 	int retval = -ENODEV;
499 
500 	dev_dbg(&acm->control->dev, "%s\n", __func__);
501 
502 	mutex_lock(&acm->mutex);
503 	if (acm->disconnected)
504 		goto disconnected;
505 
506 	retval = usb_autopm_get_interface(acm->control);
507 	if (retval)
508 		goto error_get_interface;
509 
510 	/*
511 	 * FIXME: Why do we need this? Allocating 64K of physically contiguous
512 	 * memory is really nasty...
513 	 */
514 	set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
515 	acm->control->needs_remote_wakeup = 1;
516 
517 	acm->ctrlurb->dev = acm->dev;
518 	if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
519 		dev_err(&acm->control->dev,
520 			"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
521 		goto error_submit_urb;
522 	}
523 
524 	acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
525 	if (acm_set_control(acm, acm->ctrlout) < 0 &&
526 	    (acm->ctrl_caps & USB_CDC_CAP_LINE))
527 		goto error_set_control;
528 
529 	usb_autopm_put_interface(acm->control);
530 
531 	/*
532 	 * Unthrottle device in case the TTY was closed while throttled.
533 	 */
534 	spin_lock_irq(&acm->read_lock);
535 	acm->throttled = 0;
536 	acm->throttle_req = 0;
537 	spin_unlock_irq(&acm->read_lock);
538 
539 	if (acm_submit_read_urbs(acm, GFP_KERNEL))
540 		goto error_submit_read_urbs;
541 
542 	mutex_unlock(&acm->mutex);
543 
544 	return 0;
545 
546 error_submit_read_urbs:
547 	acm->ctrlout = 0;
548 	acm_set_control(acm, acm->ctrlout);
549 error_set_control:
550 	usb_kill_urb(acm->ctrlurb);
551 error_submit_urb:
552 	usb_autopm_put_interface(acm->control);
553 error_get_interface:
554 disconnected:
555 	mutex_unlock(&acm->mutex);
556 	return retval;
557 }
558 
559 static void acm_port_destruct(struct tty_port *port)
560 {
561 	struct acm *acm = container_of(port, struct acm, port);
562 
563 	dev_dbg(&acm->control->dev, "%s\n", __func__);
564 
565 	acm_release_minor(acm);
566 	usb_put_intf(acm->control);
567 	kfree(acm->country_codes);
568 	kfree(acm);
569 }
570 
571 static void acm_port_shutdown(struct tty_port *port)
572 {
573 	struct acm *acm = container_of(port, struct acm, port);
574 	int i;
575 
576 	dev_dbg(&acm->control->dev, "%s\n", __func__);
577 
578 	mutex_lock(&acm->mutex);
579 	if (!acm->disconnected) {
580 		usb_autopm_get_interface(acm->control);
581 		acm_set_control(acm, acm->ctrlout = 0);
582 		usb_kill_urb(acm->ctrlurb);
583 		for (i = 0; i < ACM_NW; i++)
584 			usb_kill_urb(acm->wb[i].urb);
585 		for (i = 0; i < acm->rx_buflimit; i++)
586 			usb_kill_urb(acm->read_urbs[i]);
587 		acm->control->needs_remote_wakeup = 0;
588 		usb_autopm_put_interface(acm->control);
589 	}
590 	mutex_unlock(&acm->mutex);
591 }
592 
593 static void acm_tty_cleanup(struct tty_struct *tty)
594 {
595 	struct acm *acm = tty->driver_data;
596 	dev_dbg(&acm->control->dev, "%s\n", __func__);
597 	tty_port_put(&acm->port);
598 }
599 
600 static void acm_tty_hangup(struct tty_struct *tty)
601 {
602 	struct acm *acm = tty->driver_data;
603 	dev_dbg(&acm->control->dev, "%s\n", __func__);
604 	tty_port_hangup(&acm->port);
605 }
606 
607 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
608 {
609 	struct acm *acm = tty->driver_data;
610 	dev_dbg(&acm->control->dev, "%s\n", __func__);
611 	tty_port_close(&acm->port, tty, filp);
612 }
613 
614 static int acm_tty_write(struct tty_struct *tty,
615 					const unsigned char *buf, int count)
616 {
617 	struct acm *acm = tty->driver_data;
618 	int stat;
619 	unsigned long flags;
620 	int wbn;
621 	struct acm_wb *wb;
622 
623 	if (!count)
624 		return 0;
625 
626 	dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
627 
628 	spin_lock_irqsave(&acm->write_lock, flags);
629 	wbn = acm_wb_alloc(acm);
630 	if (wbn < 0) {
631 		spin_unlock_irqrestore(&acm->write_lock, flags);
632 		return 0;
633 	}
634 	wb = &acm->wb[wbn];
635 
636 	if (!acm->dev) {
637 		wb->use = 0;
638 		spin_unlock_irqrestore(&acm->write_lock, flags);
639 		return -ENODEV;
640 	}
641 
642 	count = (count > acm->writesize) ? acm->writesize : count;
643 	dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
644 	memcpy(wb->buf, buf, count);
645 	wb->len = count;
646 
647 	usb_autopm_get_interface_async(acm->control);
648 	if (acm->susp_count) {
649 		if (!acm->delayed_wb)
650 			acm->delayed_wb = wb;
651 		else
652 			usb_autopm_put_interface_async(acm->control);
653 		spin_unlock_irqrestore(&acm->write_lock, flags);
654 		return count;	/* A white lie */
655 	}
656 	usb_mark_last_busy(acm->dev);
657 
658 	stat = acm_start_wb(acm, wb);
659 	spin_unlock_irqrestore(&acm->write_lock, flags);
660 
661 	if (stat < 0)
662 		return stat;
663 	return count;
664 }
665 
666 static int acm_tty_write_room(struct tty_struct *tty)
667 {
668 	struct acm *acm = tty->driver_data;
669 	/*
670 	 * Do not let the line discipline to know that we have a reserve,
671 	 * or it might get too enthusiastic.
672 	 */
673 	return acm_wb_is_avail(acm) ? acm->writesize : 0;
674 }
675 
676 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
677 {
678 	struct acm *acm = tty->driver_data;
679 	/*
680 	 * if the device was unplugged then any remaining characters fell out
681 	 * of the connector ;)
682 	 */
683 	if (acm->disconnected)
684 		return 0;
685 	/*
686 	 * This is inaccurate (overcounts), but it works.
687 	 */
688 	return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
689 }
690 
691 static void acm_tty_throttle(struct tty_struct *tty)
692 {
693 	struct acm *acm = tty->driver_data;
694 
695 	spin_lock_irq(&acm->read_lock);
696 	acm->throttle_req = 1;
697 	spin_unlock_irq(&acm->read_lock);
698 }
699 
700 static void acm_tty_unthrottle(struct tty_struct *tty)
701 {
702 	struct acm *acm = tty->driver_data;
703 	unsigned int was_throttled;
704 
705 	spin_lock_irq(&acm->read_lock);
706 	was_throttled = acm->throttled;
707 	acm->throttled = 0;
708 	acm->throttle_req = 0;
709 	spin_unlock_irq(&acm->read_lock);
710 
711 	if (was_throttled)
712 		acm_submit_read_urbs(acm, GFP_KERNEL);
713 }
714 
715 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
716 {
717 	struct acm *acm = tty->driver_data;
718 	int retval;
719 
720 	retval = acm_send_break(acm, state ? 0xffff : 0);
721 	if (retval < 0)
722 		dev_dbg(&acm->control->dev, "%s - send break failed\n",
723 								__func__);
724 	return retval;
725 }
726 
727 static int acm_tty_tiocmget(struct tty_struct *tty)
728 {
729 	struct acm *acm = tty->driver_data;
730 
731 	return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
732 	       (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
733 	       (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
734 	       (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
735 	       (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
736 	       TIOCM_CTS;
737 }
738 
739 static int acm_tty_tiocmset(struct tty_struct *tty,
740 			    unsigned int set, unsigned int clear)
741 {
742 	struct acm *acm = tty->driver_data;
743 	unsigned int newctrl;
744 
745 	newctrl = acm->ctrlout;
746 	set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
747 					(set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
748 	clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
749 					(clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
750 
751 	newctrl = (newctrl & ~clear) | set;
752 
753 	if (acm->ctrlout == newctrl)
754 		return 0;
755 	return acm_set_control(acm, acm->ctrlout = newctrl);
756 }
757 
758 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
759 {
760 	struct serial_struct tmp;
761 
762 	if (!info)
763 		return -EINVAL;
764 
765 	memset(&tmp, 0, sizeof(tmp));
766 	tmp.flags = ASYNC_LOW_LATENCY;
767 	tmp.xmit_fifo_size = acm->writesize;
768 	tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
769 	tmp.close_delay	= acm->port.close_delay / 10;
770 	tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
771 				ASYNC_CLOSING_WAIT_NONE :
772 				acm->port.closing_wait / 10;
773 
774 	if (copy_to_user(info, &tmp, sizeof(tmp)))
775 		return -EFAULT;
776 	else
777 		return 0;
778 }
779 
780 static int set_serial_info(struct acm *acm,
781 				struct serial_struct __user *newinfo)
782 {
783 	struct serial_struct new_serial;
784 	unsigned int closing_wait, close_delay;
785 	int retval = 0;
786 
787 	if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
788 		return -EFAULT;
789 
790 	close_delay = new_serial.close_delay * 10;
791 	closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
792 			ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
793 
794 	mutex_lock(&acm->port.mutex);
795 
796 	if (!capable(CAP_SYS_ADMIN)) {
797 		if ((close_delay != acm->port.close_delay) ||
798 		    (closing_wait != acm->port.closing_wait))
799 			retval = -EPERM;
800 		else
801 			retval = -EOPNOTSUPP;
802 	} else {
803 		acm->port.close_delay  = close_delay;
804 		acm->port.closing_wait = closing_wait;
805 	}
806 
807 	mutex_unlock(&acm->port.mutex);
808 	return retval;
809 }
810 
811 static int wait_serial_change(struct acm *acm, unsigned long arg)
812 {
813 	int rv = 0;
814 	DECLARE_WAITQUEUE(wait, current);
815 	struct async_icount old, new;
816 
817 	if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
818 		return -EINVAL;
819 	do {
820 		spin_lock_irq(&acm->read_lock);
821 		old = acm->oldcount;
822 		new = acm->iocount;
823 		acm->oldcount = new;
824 		spin_unlock_irq(&acm->read_lock);
825 
826 		if ((arg & TIOCM_DSR) &&
827 			old.dsr != new.dsr)
828 			break;
829 		if ((arg & TIOCM_CD)  &&
830 			old.dcd != new.dcd)
831 			break;
832 		if ((arg & TIOCM_RI) &&
833 			old.rng != new.rng)
834 			break;
835 
836 		add_wait_queue(&acm->wioctl, &wait);
837 		set_current_state(TASK_INTERRUPTIBLE);
838 		schedule();
839 		remove_wait_queue(&acm->wioctl, &wait);
840 		if (acm->disconnected) {
841 			if (arg & TIOCM_CD)
842 				break;
843 			else
844 				rv = -ENODEV;
845 		} else {
846 			if (signal_pending(current))
847 				rv = -ERESTARTSYS;
848 		}
849 	} while (!rv);
850 
851 
852 
853 	return rv;
854 }
855 
856 static int get_serial_usage(struct acm *acm,
857 			    struct serial_icounter_struct __user *count)
858 {
859 	struct serial_icounter_struct icount;
860 	int rv = 0;
861 
862 	memset(&icount, 0, sizeof(icount));
863 	icount.dsr = acm->iocount.dsr;
864 	icount.rng = acm->iocount.rng;
865 	icount.dcd = acm->iocount.dcd;
866 	icount.frame = acm->iocount.frame;
867 	icount.overrun = acm->iocount.overrun;
868 	icount.parity = acm->iocount.parity;
869 	icount.brk = acm->iocount.brk;
870 
871 	if (copy_to_user(count, &icount, sizeof(icount)) > 0)
872 		rv = -EFAULT;
873 
874 	return rv;
875 }
876 
877 static int acm_tty_ioctl(struct tty_struct *tty,
878 					unsigned int cmd, unsigned long arg)
879 {
880 	struct acm *acm = tty->driver_data;
881 	int rv = -ENOIOCTLCMD;
882 
883 	switch (cmd) {
884 	case TIOCGSERIAL: /* gets serial port data */
885 		rv = get_serial_info(acm, (struct serial_struct __user *) arg);
886 		break;
887 	case TIOCSSERIAL:
888 		rv = set_serial_info(acm, (struct serial_struct __user *) arg);
889 		break;
890 	case TIOCMIWAIT:
891 		rv = usb_autopm_get_interface(acm->control);
892 		if (rv < 0) {
893 			rv = -EIO;
894 			break;
895 		}
896 		rv = wait_serial_change(acm, arg);
897 		usb_autopm_put_interface(acm->control);
898 		break;
899 	case TIOCGICOUNT:
900 		rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
901 		break;
902 	}
903 
904 	return rv;
905 }
906 
907 static void acm_tty_set_termios(struct tty_struct *tty,
908 						struct ktermios *termios_old)
909 {
910 	struct acm *acm = tty->driver_data;
911 	struct ktermios *termios = &tty->termios;
912 	struct usb_cdc_line_coding newline;
913 	int newctrl = acm->ctrlout;
914 
915 	newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
916 	newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
917 	newline.bParityType = termios->c_cflag & PARENB ?
918 				(termios->c_cflag & PARODD ? 1 : 2) +
919 				(termios->c_cflag & CMSPAR ? 2 : 0) : 0;
920 	switch (termios->c_cflag & CSIZE) {
921 	case CS5:
922 		newline.bDataBits = 5;
923 		break;
924 	case CS6:
925 		newline.bDataBits = 6;
926 		break;
927 	case CS7:
928 		newline.bDataBits = 7;
929 		break;
930 	case CS8:
931 	default:
932 		newline.bDataBits = 8;
933 		break;
934 	}
935 	/* FIXME: Needs to clear unsupported bits in the termios */
936 	acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
937 
938 	if (!newline.dwDTERate) {
939 		newline.dwDTERate = acm->line.dwDTERate;
940 		newctrl &= ~ACM_CTRL_DTR;
941 	} else
942 		newctrl |=  ACM_CTRL_DTR;
943 
944 	if (newctrl != acm->ctrlout)
945 		acm_set_control(acm, acm->ctrlout = newctrl);
946 
947 	if (memcmp(&acm->line, &newline, sizeof newline)) {
948 		memcpy(&acm->line, &newline, sizeof newline);
949 		dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
950 			__func__,
951 			le32_to_cpu(newline.dwDTERate),
952 			newline.bCharFormat, newline.bParityType,
953 			newline.bDataBits);
954 		acm_set_line(acm, &acm->line);
955 	}
956 }
957 
958 static const struct tty_port_operations acm_port_ops = {
959 	.shutdown = acm_port_shutdown,
960 	.activate = acm_port_activate,
961 	.destruct = acm_port_destruct,
962 };
963 
964 /*
965  * USB probe and disconnect routines.
966  */
967 
968 /* Little helpers: write/read buffers free */
969 static void acm_write_buffers_free(struct acm *acm)
970 {
971 	int i;
972 	struct acm_wb *wb;
973 	struct usb_device *usb_dev = interface_to_usbdev(acm->control);
974 
975 	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
976 		usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
977 }
978 
979 static void acm_read_buffers_free(struct acm *acm)
980 {
981 	struct usb_device *usb_dev = interface_to_usbdev(acm->control);
982 	int i;
983 
984 	for (i = 0; i < acm->rx_buflimit; i++)
985 		usb_free_coherent(usb_dev, acm->readsize,
986 			  acm->read_buffers[i].base, acm->read_buffers[i].dma);
987 }
988 
989 /* Little helper: write buffers allocate */
990 static int acm_write_buffers_alloc(struct acm *acm)
991 {
992 	int i;
993 	struct acm_wb *wb;
994 
995 	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
996 		wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
997 		    &wb->dmah);
998 		if (!wb->buf) {
999 			while (i != 0) {
1000 				--i;
1001 				--wb;
1002 				usb_free_coherent(acm->dev, acm->writesize,
1003 				    wb->buf, wb->dmah);
1004 			}
1005 			return -ENOMEM;
1006 		}
1007 	}
1008 	return 0;
1009 }
1010 
1011 static int acm_probe(struct usb_interface *intf,
1012 		     const struct usb_device_id *id)
1013 {
1014 	struct usb_cdc_union_desc *union_header = NULL;
1015 	struct usb_cdc_country_functional_desc *cfd = NULL;
1016 	unsigned char *buffer = intf->altsetting->extra;
1017 	int buflen = intf->altsetting->extralen;
1018 	struct usb_interface *control_interface;
1019 	struct usb_interface *data_interface;
1020 	struct usb_endpoint_descriptor *epctrl = NULL;
1021 	struct usb_endpoint_descriptor *epread = NULL;
1022 	struct usb_endpoint_descriptor *epwrite = NULL;
1023 	struct usb_device *usb_dev = interface_to_usbdev(intf);
1024 	struct acm *acm;
1025 	int minor;
1026 	int ctrlsize, readsize;
1027 	u8 *buf;
1028 	u8 ac_management_function = 0;
1029 	u8 call_management_function = 0;
1030 	int call_interface_num = -1;
1031 	int data_interface_num = -1;
1032 	unsigned long quirks;
1033 	int num_rx_buf;
1034 	int i;
1035 	int combined_interfaces = 0;
1036 	struct device *tty_dev;
1037 	int rv = -ENOMEM;
1038 
1039 	/* normal quirks */
1040 	quirks = (unsigned long)id->driver_info;
1041 
1042 	if (quirks == IGNORE_DEVICE)
1043 		return -ENODEV;
1044 
1045 	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1046 
1047 	/* handle quirks deadly to normal probing*/
1048 	if (quirks == NO_UNION_NORMAL) {
1049 		data_interface = usb_ifnum_to_if(usb_dev, 1);
1050 		control_interface = usb_ifnum_to_if(usb_dev, 0);
1051 		goto skip_normal_probe;
1052 	}
1053 
1054 	/* normal probing*/
1055 	if (!buffer) {
1056 		dev_err(&intf->dev, "Weird descriptor references\n");
1057 		return -EINVAL;
1058 	}
1059 
1060 	if (!buflen) {
1061 		if (intf->cur_altsetting->endpoint &&
1062 				intf->cur_altsetting->endpoint->extralen &&
1063 				intf->cur_altsetting->endpoint->extra) {
1064 			dev_dbg(&intf->dev,
1065 				"Seeking extra descriptors on endpoint\n");
1066 			buflen = intf->cur_altsetting->endpoint->extralen;
1067 			buffer = intf->cur_altsetting->endpoint->extra;
1068 		} else {
1069 			dev_err(&intf->dev,
1070 				"Zero length descriptor references\n");
1071 			return -EINVAL;
1072 		}
1073 	}
1074 
1075 	while (buflen > 0) {
1076 		if (buffer[1] != USB_DT_CS_INTERFACE) {
1077 			dev_err(&intf->dev, "skipping garbage\n");
1078 			goto next_desc;
1079 		}
1080 
1081 		switch (buffer[2]) {
1082 		case USB_CDC_UNION_TYPE: /* we've found it */
1083 			if (union_header) {
1084 				dev_err(&intf->dev, "More than one "
1085 					"union descriptor, skipping ...\n");
1086 				goto next_desc;
1087 			}
1088 			union_header = (struct usb_cdc_union_desc *)buffer;
1089 			break;
1090 		case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1091 			cfd = (struct usb_cdc_country_functional_desc *)buffer;
1092 			break;
1093 		case USB_CDC_HEADER_TYPE: /* maybe check version */
1094 			break; /* for now we ignore it */
1095 		case USB_CDC_ACM_TYPE:
1096 			ac_management_function = buffer[3];
1097 			break;
1098 		case USB_CDC_CALL_MANAGEMENT_TYPE:
1099 			call_management_function = buffer[3];
1100 			call_interface_num = buffer[4];
1101 			if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1102 				dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1103 			break;
1104 		default:
1105 			/* there are LOTS more CDC descriptors that
1106 			 * could legitimately be found here.
1107 			 */
1108 			dev_dbg(&intf->dev, "Ignoring descriptor: "
1109 					"type %02x, length %d\n",
1110 					buffer[2], buffer[0]);
1111 			break;
1112 		}
1113 next_desc:
1114 		buflen -= buffer[0];
1115 		buffer += buffer[0];
1116 	}
1117 
1118 	if (!union_header) {
1119 		if (call_interface_num > 0) {
1120 			dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1121 			/* quirks for Droids MuIn LCD */
1122 			if (quirks & NO_DATA_INTERFACE)
1123 				data_interface = usb_ifnum_to_if(usb_dev, 0);
1124 			else
1125 				data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1126 			control_interface = intf;
1127 		} else {
1128 			if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1129 				dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1130 				return -ENODEV;
1131 			} else {
1132 				dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1133 				combined_interfaces = 1;
1134 				control_interface = data_interface = intf;
1135 				goto look_for_collapsed_interface;
1136 			}
1137 		}
1138 	} else {
1139 		control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1140 		data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1141 		if (!control_interface || !data_interface) {
1142 			dev_dbg(&intf->dev, "no interfaces\n");
1143 			return -ENODEV;
1144 		}
1145 	}
1146 
1147 	if (data_interface_num != call_interface_num)
1148 		dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1149 
1150 	if (control_interface == data_interface) {
1151 		/* some broken devices designed for windows work this way */
1152 		dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1153 		combined_interfaces = 1;
1154 		/* a popular other OS doesn't use it */
1155 		quirks |= NO_CAP_LINE;
1156 		if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1157 			dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1158 			return -EINVAL;
1159 		}
1160 look_for_collapsed_interface:
1161 		for (i = 0; i < 3; i++) {
1162 			struct usb_endpoint_descriptor *ep;
1163 			ep = &data_interface->cur_altsetting->endpoint[i].desc;
1164 
1165 			if (usb_endpoint_is_int_in(ep))
1166 				epctrl = ep;
1167 			else if (usb_endpoint_is_bulk_out(ep))
1168 				epwrite = ep;
1169 			else if (usb_endpoint_is_bulk_in(ep))
1170 				epread = ep;
1171 			else
1172 				return -EINVAL;
1173 		}
1174 		if (!epctrl || !epread || !epwrite)
1175 			return -ENODEV;
1176 		else
1177 			goto made_compressed_probe;
1178 	}
1179 
1180 skip_normal_probe:
1181 
1182 	/*workaround for switched interfaces */
1183 	if (data_interface->cur_altsetting->desc.bInterfaceClass
1184 						!= CDC_DATA_INTERFACE_TYPE) {
1185 		if (control_interface->cur_altsetting->desc.bInterfaceClass
1186 						== CDC_DATA_INTERFACE_TYPE) {
1187 			struct usb_interface *t;
1188 			dev_dbg(&intf->dev,
1189 				"Your device has switched interfaces.\n");
1190 			t = control_interface;
1191 			control_interface = data_interface;
1192 			data_interface = t;
1193 		} else {
1194 			return -EINVAL;
1195 		}
1196 	}
1197 
1198 	/* Accept probe requests only for the control interface */
1199 	if (!combined_interfaces && intf != control_interface)
1200 		return -ENODEV;
1201 
1202 	if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1203 		/* valid in this context */
1204 		dev_dbg(&intf->dev, "The data interface isn't available\n");
1205 		return -EBUSY;
1206 	}
1207 
1208 
1209 	if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1210 	    control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1211 		return -EINVAL;
1212 
1213 	epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1214 	epread = &data_interface->cur_altsetting->endpoint[0].desc;
1215 	epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1216 
1217 
1218 	/* workaround for switched endpoints */
1219 	if (!usb_endpoint_dir_in(epread)) {
1220 		/* descriptors are swapped */
1221 		struct usb_endpoint_descriptor *t;
1222 		dev_dbg(&intf->dev,
1223 			"The data interface has switched endpoints\n");
1224 		t = epread;
1225 		epread = epwrite;
1226 		epwrite = t;
1227 	}
1228 made_compressed_probe:
1229 	dev_dbg(&intf->dev, "interfaces are valid\n");
1230 
1231 	acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1232 	if (acm == NULL) {
1233 		dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1234 		goto alloc_fail;
1235 	}
1236 
1237 	minor = acm_alloc_minor(acm);
1238 	if (minor == ACM_TTY_MINORS) {
1239 		dev_err(&intf->dev, "no more free acm devices\n");
1240 		kfree(acm);
1241 		return -ENODEV;
1242 	}
1243 
1244 	ctrlsize = usb_endpoint_maxp(epctrl);
1245 	readsize = usb_endpoint_maxp(epread) *
1246 				(quirks == SINGLE_RX_URB ? 1 : 2);
1247 	acm->combined_interfaces = combined_interfaces;
1248 	acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1249 	acm->control = control_interface;
1250 	acm->data = data_interface;
1251 	acm->minor = minor;
1252 	acm->dev = usb_dev;
1253 	acm->ctrl_caps = ac_management_function;
1254 	if (quirks & NO_CAP_LINE)
1255 		acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1256 	acm->ctrlsize = ctrlsize;
1257 	acm->readsize = readsize;
1258 	acm->rx_buflimit = num_rx_buf;
1259 	INIT_WORK(&acm->work, acm_softint);
1260 	init_waitqueue_head(&acm->wioctl);
1261 	spin_lock_init(&acm->write_lock);
1262 	spin_lock_init(&acm->read_lock);
1263 	mutex_init(&acm->mutex);
1264 	acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1265 	acm->is_int_ep = usb_endpoint_xfer_int(epread);
1266 	if (acm->is_int_ep)
1267 		acm->bInterval = epread->bInterval;
1268 	tty_port_init(&acm->port);
1269 	acm->port.ops = &acm_port_ops;
1270 
1271 	buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1272 	if (!buf) {
1273 		dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1274 		goto alloc_fail2;
1275 	}
1276 	acm->ctrl_buffer = buf;
1277 
1278 	if (acm_write_buffers_alloc(acm) < 0) {
1279 		dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1280 		goto alloc_fail4;
1281 	}
1282 
1283 	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1284 	if (!acm->ctrlurb) {
1285 		dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1286 		goto alloc_fail5;
1287 	}
1288 	for (i = 0; i < num_rx_buf; i++) {
1289 		struct acm_rb *rb = &(acm->read_buffers[i]);
1290 		struct urb *urb;
1291 
1292 		rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1293 								&rb->dma);
1294 		if (!rb->base) {
1295 			dev_err(&intf->dev, "out of memory "
1296 					"(read bufs usb_alloc_coherent)\n");
1297 			goto alloc_fail6;
1298 		}
1299 		rb->index = i;
1300 		rb->instance = acm;
1301 
1302 		urb = usb_alloc_urb(0, GFP_KERNEL);
1303 		if (!urb) {
1304 			dev_err(&intf->dev,
1305 				"out of memory (read urbs usb_alloc_urb)\n");
1306 			goto alloc_fail6;
1307 		}
1308 		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1309 		urb->transfer_dma = rb->dma;
1310 		if (acm->is_int_ep) {
1311 			usb_fill_int_urb(urb, acm->dev,
1312 					 acm->rx_endpoint,
1313 					 rb->base,
1314 					 acm->readsize,
1315 					 acm_read_bulk_callback, rb,
1316 					 acm->bInterval);
1317 		} else {
1318 			usb_fill_bulk_urb(urb, acm->dev,
1319 					  acm->rx_endpoint,
1320 					  rb->base,
1321 					  acm->readsize,
1322 					  acm_read_bulk_callback, rb);
1323 		}
1324 
1325 		acm->read_urbs[i] = urb;
1326 		__set_bit(i, &acm->read_urbs_free);
1327 	}
1328 	for (i = 0; i < ACM_NW; i++) {
1329 		struct acm_wb *snd = &(acm->wb[i]);
1330 
1331 		snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1332 		if (snd->urb == NULL) {
1333 			dev_err(&intf->dev,
1334 				"out of memory (write urbs usb_alloc_urb)\n");
1335 			goto alloc_fail7;
1336 		}
1337 
1338 		if (usb_endpoint_xfer_int(epwrite))
1339 			usb_fill_int_urb(snd->urb, usb_dev,
1340 				usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1341 				NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1342 		else
1343 			usb_fill_bulk_urb(snd->urb, usb_dev,
1344 				usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1345 				NULL, acm->writesize, acm_write_bulk, snd);
1346 		snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1347 		snd->instance = acm;
1348 	}
1349 
1350 	usb_set_intfdata(intf, acm);
1351 
1352 	i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1353 	if (i < 0)
1354 		goto alloc_fail7;
1355 
1356 	if (cfd) { /* export the country data */
1357 		acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1358 		if (!acm->country_codes)
1359 			goto skip_countries;
1360 		acm->country_code_size = cfd->bLength - 4;
1361 		memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1362 							cfd->bLength - 4);
1363 		acm->country_rel_date = cfd->iCountryCodeRelDate;
1364 
1365 		i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1366 		if (i < 0) {
1367 			kfree(acm->country_codes);
1368 			acm->country_codes = NULL;
1369 			acm->country_code_size = 0;
1370 			goto skip_countries;
1371 		}
1372 
1373 		i = device_create_file(&intf->dev,
1374 						&dev_attr_iCountryCodeRelDate);
1375 		if (i < 0) {
1376 			device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1377 			kfree(acm->country_codes);
1378 			acm->country_codes = NULL;
1379 			acm->country_code_size = 0;
1380 			goto skip_countries;
1381 		}
1382 	}
1383 
1384 skip_countries:
1385 	usb_fill_int_urb(acm->ctrlurb, usb_dev,
1386 			 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1387 			 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1388 			 /* works around buggy devices */
1389 			 epctrl->bInterval ? epctrl->bInterval : 16);
1390 	acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1391 	acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1392 
1393 	dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1394 
1395 	acm_set_control(acm, acm->ctrlout);
1396 
1397 	acm->line.dwDTERate = cpu_to_le32(9600);
1398 	acm->line.bDataBits = 8;
1399 	acm_set_line(acm, &acm->line);
1400 
1401 	usb_driver_claim_interface(&acm_driver, data_interface, acm);
1402 	usb_set_intfdata(data_interface, acm);
1403 
1404 	usb_get_intf(control_interface);
1405 	tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1406 			&control_interface->dev);
1407 	if (IS_ERR(tty_dev)) {
1408 		rv = PTR_ERR(tty_dev);
1409 		goto alloc_fail8;
1410 	}
1411 
1412 	return 0;
1413 alloc_fail8:
1414 	if (acm->country_codes) {
1415 		device_remove_file(&acm->control->dev,
1416 				&dev_attr_wCountryCodes);
1417 		device_remove_file(&acm->control->dev,
1418 				&dev_attr_iCountryCodeRelDate);
1419 	}
1420 	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1421 alloc_fail7:
1422 	usb_set_intfdata(intf, NULL);
1423 	for (i = 0; i < ACM_NW; i++)
1424 		usb_free_urb(acm->wb[i].urb);
1425 alloc_fail6:
1426 	for (i = 0; i < num_rx_buf; i++)
1427 		usb_free_urb(acm->read_urbs[i]);
1428 	acm_read_buffers_free(acm);
1429 	usb_free_urb(acm->ctrlurb);
1430 alloc_fail5:
1431 	acm_write_buffers_free(acm);
1432 alloc_fail4:
1433 	usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1434 alloc_fail2:
1435 	acm_release_minor(acm);
1436 	kfree(acm);
1437 alloc_fail:
1438 	return rv;
1439 }
1440 
1441 static void stop_data_traffic(struct acm *acm)
1442 {
1443 	int i;
1444 
1445 	dev_dbg(&acm->control->dev, "%s\n", __func__);
1446 
1447 	usb_kill_urb(acm->ctrlurb);
1448 	for (i = 0; i < ACM_NW; i++)
1449 		usb_kill_urb(acm->wb[i].urb);
1450 	for (i = 0; i < acm->rx_buflimit; i++)
1451 		usb_kill_urb(acm->read_urbs[i]);
1452 
1453 	cancel_work_sync(&acm->work);
1454 }
1455 
1456 static void acm_disconnect(struct usb_interface *intf)
1457 {
1458 	struct acm *acm = usb_get_intfdata(intf);
1459 	struct usb_device *usb_dev = interface_to_usbdev(intf);
1460 	struct tty_struct *tty;
1461 	int i;
1462 
1463 	dev_dbg(&intf->dev, "%s\n", __func__);
1464 
1465 	/* sibling interface is already cleaning up */
1466 	if (!acm)
1467 		return;
1468 
1469 	mutex_lock(&acm->mutex);
1470 	acm->disconnected = true;
1471 	if (acm->country_codes) {
1472 		device_remove_file(&acm->control->dev,
1473 				&dev_attr_wCountryCodes);
1474 		device_remove_file(&acm->control->dev,
1475 				&dev_attr_iCountryCodeRelDate);
1476 	}
1477 	wake_up_all(&acm->wioctl);
1478 	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1479 	usb_set_intfdata(acm->control, NULL);
1480 	usb_set_intfdata(acm->data, NULL);
1481 	mutex_unlock(&acm->mutex);
1482 
1483 	tty = tty_port_tty_get(&acm->port);
1484 	if (tty) {
1485 		tty_vhangup(tty);
1486 		tty_kref_put(tty);
1487 	}
1488 
1489 	stop_data_traffic(acm);
1490 
1491 	tty_unregister_device(acm_tty_driver, acm->minor);
1492 
1493 	usb_free_urb(acm->ctrlurb);
1494 	for (i = 0; i < ACM_NW; i++)
1495 		usb_free_urb(acm->wb[i].urb);
1496 	for (i = 0; i < acm->rx_buflimit; i++)
1497 		usb_free_urb(acm->read_urbs[i]);
1498 	acm_write_buffers_free(acm);
1499 	usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1500 	acm_read_buffers_free(acm);
1501 
1502 	if (!acm->combined_interfaces)
1503 		usb_driver_release_interface(&acm_driver, intf == acm->control ?
1504 					acm->data : acm->control);
1505 
1506 	tty_port_put(&acm->port);
1507 }
1508 
1509 #ifdef CONFIG_PM
1510 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1511 {
1512 	struct acm *acm = usb_get_intfdata(intf);
1513 	int cnt;
1514 
1515 	if (PMSG_IS_AUTO(message)) {
1516 		int b;
1517 
1518 		spin_lock_irq(&acm->write_lock);
1519 		b = acm->transmitting;
1520 		spin_unlock_irq(&acm->write_lock);
1521 		if (b)
1522 			return -EBUSY;
1523 	}
1524 
1525 	spin_lock_irq(&acm->read_lock);
1526 	spin_lock(&acm->write_lock);
1527 	cnt = acm->susp_count++;
1528 	spin_unlock(&acm->write_lock);
1529 	spin_unlock_irq(&acm->read_lock);
1530 
1531 	if (cnt)
1532 		return 0;
1533 
1534 	if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1535 		stop_data_traffic(acm);
1536 
1537 	return 0;
1538 }
1539 
1540 static int acm_resume(struct usb_interface *intf)
1541 {
1542 	struct acm *acm = usb_get_intfdata(intf);
1543 	struct acm_wb *wb;
1544 	int rv = 0;
1545 	int cnt;
1546 
1547 	spin_lock_irq(&acm->read_lock);
1548 	acm->susp_count -= 1;
1549 	cnt = acm->susp_count;
1550 	spin_unlock_irq(&acm->read_lock);
1551 
1552 	if (cnt)
1553 		return 0;
1554 
1555 	if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1556 		rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1557 
1558 		spin_lock_irq(&acm->write_lock);
1559 		if (acm->delayed_wb) {
1560 			wb = acm->delayed_wb;
1561 			acm->delayed_wb = NULL;
1562 			spin_unlock_irq(&acm->write_lock);
1563 			acm_start_wb(acm, wb);
1564 		} else {
1565 			spin_unlock_irq(&acm->write_lock);
1566 		}
1567 
1568 		/*
1569 		 * delayed error checking because we must
1570 		 * do the write path at all cost
1571 		 */
1572 		if (rv < 0)
1573 			goto err_out;
1574 
1575 		rv = acm_submit_read_urbs(acm, GFP_NOIO);
1576 	}
1577 
1578 err_out:
1579 	return rv;
1580 }
1581 
1582 static int acm_reset_resume(struct usb_interface *intf)
1583 {
1584 	struct acm *acm = usb_get_intfdata(intf);
1585 
1586 	if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1587 		tty_port_tty_hangup(&acm->port, false);
1588 
1589 	return acm_resume(intf);
1590 }
1591 
1592 #endif /* CONFIG_PM */
1593 
1594 #define NOKIA_PCSUITE_ACM_INFO(x) \
1595 		USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1596 		USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1597 		USB_CDC_ACM_PROTO_VENDOR)
1598 
1599 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1600 		USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1601 		USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1602 		USB_CDC_ACM_PROTO_VENDOR)
1603 
1604 /*
1605  * USB driver structure.
1606  */
1607 
1608 static const struct usb_device_id acm_ids[] = {
1609 	/* quirky and broken devices */
1610 	{ USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1611 	.driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1612 	{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1613 	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1614 	},
1615 	{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1616 	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1617 	},
1618 	{ USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1619 	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1620 	},
1621 	{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1622 	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1623 	},
1624 	{ USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1625 	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1626 	},
1627 	{ USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1628 	.driver_info = SINGLE_RX_URB,
1629 	},
1630 	{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1631 	.driver_info = SINGLE_RX_URB, /* firmware bug */
1632 	},
1633 	{ USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1634 	.driver_info = SINGLE_RX_URB, /* firmware bug */
1635 	},
1636 	{ USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1637 	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1638 	},
1639 	{ USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1640 	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1641 	},
1642 	{ USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1643 	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1644 	},
1645 	{ USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1646 	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1647 	},
1648 	{ USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1649 	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1650 	},
1651 	{ USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1652 	},
1653 	/* Motorola H24 HSPA module: */
1654 	{ USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1655 	{ USB_DEVICE(0x22b8, 0x2d92) }, /* modem           + diagnostics        */
1656 	{ USB_DEVICE(0x22b8, 0x2d93) }, /* modem + AT port                      */
1657 	{ USB_DEVICE(0x22b8, 0x2d95) }, /* modem + AT port + diagnostics        */
1658 	{ USB_DEVICE(0x22b8, 0x2d96) }, /* modem                         + NMEA */
1659 	{ USB_DEVICE(0x22b8, 0x2d97) }, /* modem           + diagnostics + NMEA */
1660 	{ USB_DEVICE(0x22b8, 0x2d99) }, /* modem + AT port               + NMEA */
1661 	{ USB_DEVICE(0x22b8, 0x2d9a) }, /* modem + AT port + diagnostics + NMEA */
1662 
1663 	{ USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1664 	.driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1665 					   data interface instead of
1666 					   communications interface.
1667 					   Maybe we should define a new
1668 					   quirk for this. */
1669 	},
1670 	{ USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1671 	.driver_info = NO_UNION_NORMAL,
1672 	},
1673 	{ USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1674 	.driver_info = NO_UNION_NORMAL,
1675 	},
1676 	{ USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1677 	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1678 	},
1679 	{ USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1680 	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1681 	},
1682 
1683 	/* Nokia S60 phones expose two ACM channels. The first is
1684 	 * a modem and is picked up by the standard AT-command
1685 	 * information below. The second is 'vendor-specific' but
1686 	 * is treated as a serial device at the S60 end, so we want
1687 	 * to expose it on Linux too. */
1688 	{ NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1689 	{ NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1690 	{ NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1691 	{ NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1692 	{ NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1693 	{ NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1694 	{ NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1695 	{ NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1696 	{ NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1697 	{ NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1698 	{ NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1699 	{ NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1700 	{ NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1701 	{ NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1702 	{ NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1703 	{ NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1704 	{ NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1705 	{ NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1706 	{ NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1707 	{ NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1708 	{ NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1709 	{ NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1710 	{ NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1711 	{ NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1712 	{ NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1713 	{ NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1714 	{ NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1715 	{ NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1716 	{ NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1717 	{ NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1718 	{ NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1719 	{ NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1720 	{ NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1721 	{ NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1722 	{ NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1723 	{ NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1724 	{ NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1725 	{ NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1726 	{ NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1727 	{ NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1728 	{ NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1729 	{ NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1730 	{ NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1731 	{ NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1732 	{ NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1733 	{ NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1734 	{ NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1735 	{ NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1736 	{ NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1737 	{ NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1738 	{ NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1739 	{ NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1740 	{ NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1741 	{ NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1742 	{ NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1743 	{ NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1744 	{ NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1745 	{ SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1746 
1747 	/* Support for Owen devices */
1748 	{ USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1749 
1750 	/* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1751 
1752 	/* Support Lego NXT using pbLua firmware */
1753 	{ USB_DEVICE(0x0694, 0xff00),
1754 	.driver_info = NOT_A_MODEM,
1755 	},
1756 
1757 	/* Support for Droids MuIn LCD */
1758 	{ USB_DEVICE(0x04d8, 0x000b),
1759 	.driver_info = NO_DATA_INTERFACE,
1760 	},
1761 
1762 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1763 	{ USB_DEVICE(0x04d8, 0x0082),	/* Application mode */
1764 	.driver_info = IGNORE_DEVICE,
1765 	},
1766 	{ USB_DEVICE(0x04d8, 0x0083),	/* Bootloader mode */
1767 	.driver_info = IGNORE_DEVICE,
1768 	},
1769 #endif
1770 
1771 	/* control interfaces without any protocol set */
1772 	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1773 		USB_CDC_PROTO_NONE) },
1774 
1775 	/* control interfaces with various AT-command sets */
1776 	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1777 		USB_CDC_ACM_PROTO_AT_V25TER) },
1778 	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1779 		USB_CDC_ACM_PROTO_AT_PCCA101) },
1780 	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1781 		USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1782 	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1783 		USB_CDC_ACM_PROTO_AT_GSM) },
1784 	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1785 		USB_CDC_ACM_PROTO_AT_3G) },
1786 	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1787 		USB_CDC_ACM_PROTO_AT_CDMA) },
1788 
1789 	{ }
1790 };
1791 
1792 MODULE_DEVICE_TABLE(usb, acm_ids);
1793 
1794 static struct usb_driver acm_driver = {
1795 	.name =		"cdc_acm",
1796 	.probe =	acm_probe,
1797 	.disconnect =	acm_disconnect,
1798 #ifdef CONFIG_PM
1799 	.suspend =	acm_suspend,
1800 	.resume =	acm_resume,
1801 	.reset_resume =	acm_reset_resume,
1802 #endif
1803 	.id_table =	acm_ids,
1804 #ifdef CONFIG_PM
1805 	.supports_autosuspend = 1,
1806 #endif
1807 	.disable_hub_initiated_lpm = 1,
1808 };
1809 
1810 /*
1811  * TTY driver structures.
1812  */
1813 
1814 static const struct tty_operations acm_ops = {
1815 	.install =		acm_tty_install,
1816 	.open =			acm_tty_open,
1817 	.close =		acm_tty_close,
1818 	.cleanup =		acm_tty_cleanup,
1819 	.hangup =		acm_tty_hangup,
1820 	.write =		acm_tty_write,
1821 	.write_room =		acm_tty_write_room,
1822 	.ioctl =		acm_tty_ioctl,
1823 	.throttle =		acm_tty_throttle,
1824 	.unthrottle =		acm_tty_unthrottle,
1825 	.chars_in_buffer =	acm_tty_chars_in_buffer,
1826 	.break_ctl =		acm_tty_break_ctl,
1827 	.set_termios =		acm_tty_set_termios,
1828 	.tiocmget =		acm_tty_tiocmget,
1829 	.tiocmset =		acm_tty_tiocmset,
1830 };
1831 
1832 /*
1833  * Init / exit.
1834  */
1835 
1836 static int __init acm_init(void)
1837 {
1838 	int retval;
1839 	acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1840 	if (!acm_tty_driver)
1841 		return -ENOMEM;
1842 	acm_tty_driver->driver_name = "acm",
1843 	acm_tty_driver->name = "ttyACM",
1844 	acm_tty_driver->major = ACM_TTY_MAJOR,
1845 	acm_tty_driver->minor_start = 0,
1846 	acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1847 	acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1848 	acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1849 	acm_tty_driver->init_termios = tty_std_termios;
1850 	acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1851 								HUPCL | CLOCAL;
1852 	tty_set_operations(acm_tty_driver, &acm_ops);
1853 
1854 	retval = tty_register_driver(acm_tty_driver);
1855 	if (retval) {
1856 		put_tty_driver(acm_tty_driver);
1857 		return retval;
1858 	}
1859 
1860 	retval = usb_register(&acm_driver);
1861 	if (retval) {
1862 		tty_unregister_driver(acm_tty_driver);
1863 		put_tty_driver(acm_tty_driver);
1864 		return retval;
1865 	}
1866 
1867 	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1868 
1869 	return 0;
1870 }
1871 
1872 static void __exit acm_exit(void)
1873 {
1874 	usb_deregister(&acm_driver);
1875 	tty_unregister_driver(acm_tty_driver);
1876 	put_tty_driver(acm_tty_driver);
1877 }
1878 
1879 module_init(acm_init);
1880 module_exit(acm_exit);
1881 
1882 MODULE_AUTHOR(DRIVER_AUTHOR);
1883 MODULE_DESCRIPTION(DRIVER_DESC);
1884 MODULE_LICENSE("GPL");
1885 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
1886