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