cdc-acm.c 34 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8
/*
 * cdc-acm.c
 *
 * Copyright (c) 1999 Armin Fuerst	<fuerst@in.tum.de>
 * Copyright (c) 1999 Pavel Machek	<pavel@suse.cz>
 * Copyright (c) 1999 Johannes Erdfelt	<johannes@erdfelt.com>
 * Copyright (c) 2000 Vojtech Pavlik	<vojtech@suse.cz>
 * Copyright (c) 2004 Oliver Neukum	<oliver@neukum.name>
9
 * Copyright (c) 2005 David Kubicek	<dave@awk.cz>
Linus Torvalds's avatar
Linus Torvalds committed
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
 *
 * USB Abstract Control Model driver for USB modems and ISDN adapters
 *
 * Sponsored by SuSE
 *
 * ChangeLog:
 *	v0.9  - thorough cleaning, URBification, almost a rewrite
 *	v0.10 - some more cleanups
 *	v0.11 - fixed flow control, read error doesn't stop reads
 *	v0.12 - added TIOCM ioctls, added break handling, made struct acm kmalloced
 *	v0.13 - added termios, added hangup
 *	v0.14 - sized down struct acm
 *	v0.15 - fixed flow control again - characters could be lost
 *	v0.16 - added code for modems with swapped data and control interfaces
 *	v0.17 - added new style probing
 *	v0.18 - fixed new style probing for devices with more configurations
 *	v0.19 - fixed CLOCAL handling (thanks to Richard Shih-Ping Chan)
 *	v0.20 - switched to probing on interface (rather than device) class
 *	v0.21 - revert to probing on device for devices with multiple configs
 *	v0.22 - probe only the control interface. if usbcore doesn't choose the
 *		config we want, sysadmin changes bConfigurationValue in sysfs.
 *	v0.23 - use softirq for rx processing, as needed by tty layer
 *	v0.24 - change probe method to evaluate CDC union descriptor
33
 *	v0.25 - downstream tasks paralelized to maximize throughput
Linus Torvalds's avatar
Linus Torvalds committed
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#undef DEBUG

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
62
#include <linux/mutex.h>
Linus Torvalds's avatar
Linus Torvalds committed
63 64
#include <asm/uaccess.h>
#include <linux/usb.h>
65
#include <linux/usb/cdc.h>
Linus Torvalds's avatar
Linus Torvalds committed
66 67
#include <asm/byteorder.h>
#include <asm/unaligned.h>
68
#include <linux/list.h>
Linus Torvalds's avatar
Linus Torvalds committed
69 70 71 72 73 74

#include "cdc-acm.h"

/*
 * Version Information
 */
75 76
#define DRIVER_VERSION "v0.25"
#define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek"
Linus Torvalds's avatar
Linus Torvalds committed
77 78 79 80 81 82
#define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"

static struct usb_driver acm_driver;
static struct tty_driver *acm_tty_driver;
static struct acm *acm_table[ACM_TTY_MINORS];

83
static DEFINE_MUTEX(open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110

#define ACM_READY(acm)	(acm && acm->dev && acm->used)

/*
 * Functions for ACM control messages.
 */

static int acm_ctrl_msg(struct acm *acm, int request, int value, void *buf, int len)
{
	int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
		request, USB_RT_ACM, value,
		acm->control->altsetting[0].desc.bInterfaceNumber,
		buf, len, 5000);
	dbg("acm_control_msg: rq: 0x%02x val: %#x len: %#x result: %d", request, value, len, retval);
	return retval < 0 ? retval : 0;
}

/* devices aren't required to support these requests.
 * the cdc acm descriptor tells whether they do...
 */
#define acm_set_control(acm, control) \
	acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
#define acm_set_line(acm, line) \
	acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
#define acm_send_break(acm, ms) \
	acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)

111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128
/*
 * Write buffer management.
 * All of these assume proper locks taken by the caller.
 */

static int acm_wb_alloc(struct acm *acm)
{
	int i, wbn;
	struct acm_wb *wb;

	wbn = acm->write_current;
	i = 0;
	for (;;) {
		wb = &acm->wb[wbn];
		if (!wb->use) {
			wb->use = 1;
			return wbn;
		}
129 130
		wbn = (wbn + 1) % ACM_NW;
		if (++i >= ACM_NW)
131 132 133 134 135 136 137 138 139 140 141 142 143
			return -1;
	}
}

static void acm_wb_free(struct acm *acm, int wbn)
{
	acm->wb[wbn].use = 0;
}

static int acm_wb_is_avail(struct acm *acm)
{
	int i, n;

144 145 146
	n = ACM_NW;
	for (i = 0; i < ACM_NW; i++) {
		n -= acm->wb[i].use;
147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167
	}
	return n;
}

static inline int acm_wb_is_used(struct acm *acm, int wbn)
{
	return acm->wb[wbn].use;
}

/*
 * Finish write.
 */
static void acm_write_done(struct acm *acm)
{
	unsigned long flags;
	int wbn;

	spin_lock_irqsave(&acm->write_lock, flags);
	acm->write_ready = 1;
	wbn = acm->write_current;
	acm_wb_free(acm, wbn);
168
	acm->write_current = (wbn + 1) % ACM_NW;
169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213
	spin_unlock_irqrestore(&acm->write_lock, flags);
}

/*
 * Poke write.
 */
static int acm_write_start(struct acm *acm)
{
	unsigned long flags;
	int wbn;
	struct acm_wb *wb;
	int rc;

	spin_lock_irqsave(&acm->write_lock, flags);
	if (!acm->dev) {
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return -ENODEV;
	}

	if (!acm->write_ready) {
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;	/* A white lie */
	}

	wbn = acm->write_current;
	if (!acm_wb_is_used(acm, wbn)) {
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;
	}
	wb = &acm->wb[wbn];

	acm->write_ready = 0;
	spin_unlock_irqrestore(&acm->write_lock, flags);

	acm->writeurb->transfer_buffer = wb->buf;
	acm->writeurb->transfer_dma = wb->dmah;
	acm->writeurb->transfer_buffer_length = wb->len;
	acm->writeurb->dev = acm->dev;

	if ((rc = usb_submit_urb(acm->writeurb, GFP_ATOMIC)) < 0) {
		dbg("usb_submit_urb(write bulk) failed: %d", rc);
		acm_write_done(acm);
	}
	return rc;
}
214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
/*
 * attributes exported through sysfs
 */
static ssize_t show_caps
(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct acm *acm = usb_get_intfdata(intf);

	return sprintf(buf, "%d", acm->ctrl_caps);
}
static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);

static ssize_t show_country_codes
(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct acm *acm = usb_get_intfdata(intf);

	memcpy(buf, acm->country_codes, acm->country_code_size);
	return acm->country_code_size;
}

static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);

static ssize_t show_country_rel_date
(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct acm *acm = usb_get_intfdata(intf);

	return sprintf(buf, "%d", acm->country_rel_date);
}
247

248
static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
249 250 251 252 253
/*
 * Interrupt handlers for various ACM device responses
 */

/* control interface reports status changes with "interrupt" transfers */
254
static void acm_ctrl_irq(struct urb *urb)
Linus Torvalds's avatar
Linus Torvalds committed
255 256 257 258 259
{
	struct acm *acm = urb->context;
	struct usb_cdc_notification *dr = urb->transfer_buffer;
	unsigned char *data;
	int newctrl;
260 261
	int retval;
	int status = urb->status;
Linus Torvalds's avatar
Linus Torvalds committed
262

263
	switch (status) {
Linus Torvalds's avatar
Linus Torvalds committed
264 265 266 267 268 269 270
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
271
		dbg("%s - urb shutting down with status: %d", __FUNCTION__, status);
Linus Torvalds's avatar
Linus Torvalds committed
272 273
		return;
	default:
274
		dbg("%s - nonzero urb status received: %d", __FUNCTION__, status);
Linus Torvalds's avatar
Linus Torvalds committed
275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314
		goto exit;
	}

	if (!ACM_READY(acm))
		goto exit;

	data = (unsigned char *)(dr + 1);
	switch (dr->bNotificationType) {

		case USB_CDC_NOTIFY_NETWORK_CONNECTION:

			dbg("%s network", dr->wValue ? "connected to" : "disconnected from");
			break;

		case USB_CDC_NOTIFY_SERIAL_STATE:

			newctrl = le16_to_cpu(get_unaligned((__le16 *) data));

			if (acm->tty && !acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
				dbg("calling hangup");
				tty_hangup(acm->tty);
			}

			acm->ctrlin = newctrl;

			dbg("input control lines: dcd%c dsr%c break%c ring%c framing%c parity%c overrun%c",
				acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',	acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
				acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',	acm->ctrlin & ACM_CTRL_RI  ? '+' : '-',
				acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',	acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
				acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');

			break;

		default:
			dbg("unknown notification %d received: index %d len %d data0 %d data1 %d",
				dr->bNotificationType, dr->wIndex,
				dr->wLength, data[0], data[1]);
			break;
	}
exit:
315 316
	retval = usb_submit_urb (urb, GFP_ATOMIC);
	if (retval)
Linus Torvalds's avatar
Linus Torvalds committed
317
		err ("%s - usb_submit_urb failed with result %d",
318
		     __FUNCTION__, retval);
Linus Torvalds's avatar
Linus Torvalds committed
319 320 321
}

/* data interface returns incoming bytes, or we got unthrottled */
322
static void acm_read_bulk(struct urb *urb)
Linus Torvalds's avatar
Linus Torvalds committed
323
{
324 325 326
	struct acm_rb *buf;
	struct acm_ru *rcv = urb->context;
	struct acm *acm = rcv->instance;
327
	int status = urb->status;
328 329

	dbg("Entering acm_read_bulk with status %d", status);
Linus Torvalds's avatar
Linus Torvalds committed
330 331 332 333

	if (!ACM_READY(acm))
		return;

334
	if (status)
335
		dev_dbg(&acm->data->dev, "bulk rx status %d", status);
Linus Torvalds's avatar
Linus Torvalds committed
336

337 338 339
	buf = rcv->buffer;
	buf->size = urb->actual_length;

340 341 342 343 344 345 346 347 348 349 350 351 352 353
	if (likely(status == 0)) {
		spin_lock(&acm->read_lock);
		list_add_tail(&rcv->list, &acm->spare_read_urbs);
		list_add_tail(&buf->list, &acm->filled_read_bufs);
		spin_unlock(&acm->read_lock);
	} else {
		/* we drop the buffer due to an error */
		spin_lock(&acm->read_lock);
		list_add_tail(&rcv->list, &acm->spare_read_urbs);
		list_add(&buf->list, &acm->spare_read_bufs);
		spin_unlock(&acm->read_lock);
		/* nevertheless the tasklet must be kicked unconditionally
		so the queue cannot dry up */
	}
354
	tasklet_schedule(&acm->urb_task);
Linus Torvalds's avatar
Linus Torvalds committed
355 356 357 358 359
}

static void acm_rx_tasklet(unsigned long _acm)
{
	struct acm *acm = (void *)_acm;
360
	struct acm_rb *buf;
Linus Torvalds's avatar
Linus Torvalds committed
361
	struct tty_struct *tty = acm->tty;
362
	struct acm_ru *rcv;
363
	unsigned long flags;
364
	unsigned char throttled;
Linus Torvalds's avatar
Linus Torvalds committed
365 366
	dbg("Entering acm_rx_tasklet");

367 368 369
	if (!ACM_READY(acm))
		return;

370
	spin_lock_irqsave(&acm->throttle_lock, flags);
371
	throttled = acm->throttle;
372
	spin_unlock_irqrestore(&acm->throttle_lock, flags);
373
	if (throttled)
374 375 376
		return;

next_buffer:
377
	spin_lock_irqsave(&acm->read_lock, flags);
378
	if (list_empty(&acm->filled_read_bufs)) {
379
		spin_unlock_irqrestore(&acm->read_lock, flags);
380
		goto urbs;
Linus Torvalds's avatar
Linus Torvalds committed
381
	}
382 383 384
	buf = list_entry(acm->filled_read_bufs.next,
			 struct acm_rb, list);
	list_del(&buf->list);
385
	spin_unlock_irqrestore(&acm->read_lock, flags);
386

387
	dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d", buf, buf->size);
388

Alan Cox's avatar
Alan Cox committed
389
	tty_buffer_request_room(tty, buf->size);
390
	spin_lock_irqsave(&acm->throttle_lock, flags);
391
	throttled = acm->throttle;
392
	spin_unlock_irqrestore(&acm->throttle_lock, flags);
393
	if (!throttled)
Alan Cox's avatar
Alan Cox committed
394
		tty_insert_flip_string(tty, buf->base, buf->size);
395
	tty_flip_buffer_push(tty);
Linus Torvalds's avatar
Linus Torvalds committed
396

397 398
	if (throttled) {
		dbg("Throttling noticed");
399
		spin_lock_irqsave(&acm->read_lock, flags);
400
		list_add(&buf->list, &acm->filled_read_bufs);
401
		spin_unlock_irqrestore(&acm->read_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
402 403 404
		return;
	}

405
	spin_lock_irqsave(&acm->read_lock, flags);
406
	list_add(&buf->list, &acm->spare_read_bufs);
407
	spin_unlock_irqrestore(&acm->read_lock, flags);
408 409 410 411
	goto next_buffer;

urbs:
	while (!list_empty(&acm->spare_read_bufs)) {
412
		spin_lock_irqsave(&acm->read_lock, flags);
413
		if (list_empty(&acm->spare_read_urbs)) {
414
			spin_unlock_irqrestore(&acm->read_lock, flags);
415 416 417 418 419
			return;
		}
		rcv = list_entry(acm->spare_read_urbs.next,
				 struct acm_ru, list);
		list_del(&rcv->list);
420
		spin_unlock_irqrestore(&acm->read_lock, flags);
421 422 423 424 425 426 427 428 429 430 431 432 433 434 435

		buf = list_entry(acm->spare_read_bufs.next,
				 struct acm_rb, list);
		list_del(&buf->list);

		rcv->buffer = buf;

		usb_fill_bulk_urb(rcv->urb, acm->dev,
				  acm->rx_endpoint,
				  buf->base,
				  acm->readsize,
				  acm_read_bulk, rcv);
		rcv->urb->transfer_dma = buf->dma;
		rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

436
		dbg("acm_rx_tasklet: sending urb 0x%p, rcv 0x%p, buf 0x%p", rcv->urb, rcv, buf);
437 438 439 440 441

		/* This shouldn't kill the driver as unsuccessful URBs are returned to the
		   free-urbs-pool and resubmited ASAP */
		if (usb_submit_urb(rcv->urb, GFP_ATOMIC) < 0) {
			list_add(&buf->list, &acm->spare_read_bufs);
442
			spin_lock_irqsave(&acm->read_lock, flags);
443
			list_add(&rcv->list, &acm->spare_read_urbs);
444
			spin_unlock_irqrestore(&acm->read_lock, flags);
445 446 447
			return;
		}
	}
Linus Torvalds's avatar
Linus Torvalds committed
448 449 450
}

/* data interface wrote those outgoing bytes */
451
static void acm_write_bulk(struct urb *urb)
Linus Torvalds's avatar
Linus Torvalds committed
452 453 454
{
	struct acm *acm = (struct acm *)urb->context;

455
	dbg("Entering acm_write_bulk with status %d", urb->status);
Linus Torvalds's avatar
Linus Torvalds committed
456

457 458 459 460
	acm_write_done(acm);
	acm_write_start(acm);
	if (ACM_READY(acm))
		schedule_work(&acm->work);
Linus Torvalds's avatar
Linus Torvalds committed
461 462
}

David Howells's avatar
David Howells committed
463
static void acm_softint(struct work_struct *work)
Linus Torvalds's avatar
Linus Torvalds committed
464
{
David Howells's avatar
David Howells committed
465
	struct acm *acm = container_of(work, struct acm, work);
466
	dbg("Entering acm_softint.");
Linus Torvalds's avatar
Linus Torvalds committed
467 468 469 470 471 472 473 474 475 476 477 478 479 480
	
	if (!ACM_READY(acm))
		return;
	tty_wakeup(acm->tty);
}

/*
 * TTY handlers
 */

static int acm_tty_open(struct tty_struct *tty, struct file *filp)
{
	struct acm *acm;
	int rv = -EINVAL;
481
	int i;
482
	dbg("Entering acm_tty_open.");
483 484

	mutex_lock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
485 486 487 488 489 490 491 492 493 494

	acm = acm_table[tty->index];
	if (!acm || !acm->dev)
		goto err_out;
	else
		rv = 0;

	tty->driver_data = acm;
	acm->tty = tty;

495 496 497
	/* force low_latency on so that our tty_push actually forces the data through,
	   otherwise it is scheduled, and with high data rates data can get lost. */
	tty->low_latency = 1;
Linus Torvalds's avatar
Linus Torvalds committed
498 499 500 501 502 503 504 505 506 507 508

	if (acm->used++) {
		goto done;
        }

	acm->ctrlurb->dev = acm->dev;
	if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
		dbg("usb_submit_urb(ctrl irq) failed");
		goto bail_out;
	}

509 510
	if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS) &&
	    (acm->ctrl_caps & USB_CDC_CAP_LINE))
Linus Torvalds's avatar
Linus Torvalds committed
511 512
		goto full_bailout;

513 514 515
	INIT_LIST_HEAD(&acm->spare_read_urbs);
	INIT_LIST_HEAD(&acm->spare_read_bufs);
	INIT_LIST_HEAD(&acm->filled_read_bufs);
516
	for (i = 0; i < acm->rx_buflimit; i++) {
517 518
		list_add(&(acm->ru[i].list), &acm->spare_read_urbs);
	}
519
	for (i = 0; i < acm->rx_buflimit; i++) {
520 521 522
		list_add(&(acm->rb[i].list), &acm->spare_read_bufs);
	}

523 524
	acm->throttle = 0;

525
	tasklet_schedule(&acm->urb_task);
Linus Torvalds's avatar
Linus Torvalds committed
526 527 528

done:
err_out:
529
	mutex_unlock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
530 531 532 533 534 535
	return rv;

full_bailout:
	usb_kill_urb(acm->ctrlurb);
bail_out:
	acm->used--;
536
	mutex_unlock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
537 538 539
	return -EIO;
}

540 541
static void acm_tty_unregister(struct acm *acm)
{
542
	int i,nr;
543

544
	nr = acm->rx_buflimit;
545 546 547 548 549
	tty_unregister_device(acm_tty_driver, acm->minor);
	usb_put_intf(acm->control);
	acm_table[acm->minor] = NULL;
	usb_free_urb(acm->ctrlurb);
	usb_free_urb(acm->writeurb);
550
	for (i = 0; i < nr; i++)
551
		usb_free_urb(acm->ru[i].urb);
552
	kfree(acm->country_codes);
553 554 555
	kfree(acm);
}

Linus Torvalds's avatar
Linus Torvalds committed
556 557 558
static void acm_tty_close(struct tty_struct *tty, struct file *filp)
{
	struct acm *acm = tty->driver_data;
559
	int i,nr;
Linus Torvalds's avatar
Linus Torvalds committed
560 561 562 563

	if (!acm || !acm->used)
		return;

564
	nr = acm->rx_buflimit;
565
	mutex_lock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
566 567 568 569 570
	if (!--acm->used) {
		if (acm->dev) {
			acm_set_control(acm, acm->ctrlout = 0);
			usb_kill_urb(acm->ctrlurb);
			usb_kill_urb(acm->writeurb);
571
			for (i = 0; i < nr; i++)
572
				usb_kill_urb(acm->ru[i].urb);
573 574
		} else
			acm_tty_unregister(acm);
Linus Torvalds's avatar
Linus Torvalds committed
575
	}
576
	mutex_unlock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
577 578 579 580 581 582
}

static int acm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
	struct acm *acm = tty->driver_data;
	int stat;
583 584 585 586
	unsigned long flags;
	int wbn;
	struct acm_wb *wb;

587
	dbg("Entering acm_tty_write to write %d bytes,", count);
Linus Torvalds's avatar
Linus Torvalds committed
588 589 590 591 592 593

	if (!ACM_READY(acm))
		return -EINVAL;
	if (!count)
		return 0;

594 595 596 597 598 599 600
	spin_lock_irqsave(&acm->write_lock, flags);
	if ((wbn = acm_wb_alloc(acm)) < 0) {
		spin_unlock_irqrestore(&acm->write_lock, flags);
		acm_write_start(acm);
		return 0;
	}
	wb = &acm->wb[wbn];
Linus Torvalds's avatar
Linus Torvalds committed
601

602
	count = (count > acm->writesize) ? acm->writesize : count;
Linus Torvalds's avatar
Linus Torvalds committed
603
	dbg("Get %d bytes...", count);
604 605 606
	memcpy(wb->buf, buf, count);
	wb->len = count;
	spin_unlock_irqrestore(&acm->write_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
607

608
	if ((stat = acm_write_start(acm)) < 0)
Linus Torvalds's avatar
Linus Torvalds committed
609 610 611 612 613 614 615 616 617
		return stat;
	return count;
}

static int acm_tty_write_room(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	if (!ACM_READY(acm))
		return -EINVAL;
618 619 620 621 622
	/*
	 * Do not let the line discipline to know that we have a reserve,
	 * or it might get too enthusiastic.
	 */
	return (acm->write_ready && acm_wb_is_avail(acm)) ? acm->writesize : 0;
Linus Torvalds's avatar
Linus Torvalds committed
623 624 625 626 627 628 629
}

static int acm_tty_chars_in_buffer(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	if (!ACM_READY(acm))
		return -EINVAL;
630 631 632
	/*
	 * This is inaccurate (overcounts), but it works.
	 */
633
	return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
Linus Torvalds's avatar
Linus Torvalds committed
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653
}

static void acm_tty_throttle(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	if (!ACM_READY(acm))
		return;
	spin_lock_bh(&acm->throttle_lock);
	acm->throttle = 1;
	spin_unlock_bh(&acm->throttle_lock);
}

static void acm_tty_unthrottle(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	if (!ACM_READY(acm))
		return;
	spin_lock_bh(&acm->throttle_lock);
	acm->throttle = 0;
	spin_unlock_bh(&acm->throttle_lock);
654
	tasklet_schedule(&acm->urb_task);
Linus Torvalds's avatar
Linus Torvalds committed
655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710
}

static void acm_tty_break_ctl(struct tty_struct *tty, int state)
{
	struct acm *acm = tty->driver_data;
	if (!ACM_READY(acm))
		return;
	if (acm_send_break(acm, state ? 0xffff : 0))
		dbg("send break failed");
}

static int acm_tty_tiocmget(struct tty_struct *tty, struct file *file)
{
	struct acm *acm = tty->driver_data;

	if (!ACM_READY(acm))
		return -EINVAL;

	return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
	       (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
	       (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
	       (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
	       (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
	       TIOCM_CTS;
}

static int acm_tty_tiocmset(struct tty_struct *tty, struct file *file,
			    unsigned int set, unsigned int clear)
{
	struct acm *acm = tty->driver_data;
	unsigned int newctrl;

	if (!ACM_READY(acm))
		return -EINVAL;

	newctrl = acm->ctrlout;
	set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
	clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);

	newctrl = (newctrl & ~clear) | set;

	if (acm->ctrlout == newctrl)
		return 0;
	return acm_set_control(acm, acm->ctrlout = newctrl);
}

static int acm_tty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
{
	struct acm *acm = tty->driver_data;

	if (!ACM_READY(acm))
		return -EINVAL;

	return -ENOIOCTLCMD;
}

711
static const __u32 acm_tty_speed[] = {
Linus Torvalds's avatar
Linus Torvalds committed
712 713 714 715 716 717 718
	0, 50, 75, 110, 134, 150, 200, 300, 600,
	1200, 1800, 2400, 4800, 9600, 19200, 38400,
	57600, 115200, 230400, 460800, 500000, 576000,
	921600, 1000000, 1152000, 1500000, 2000000,
	2500000, 3000000, 3500000, 4000000
};

719
static const __u8 acm_tty_size[] = {
Linus Torvalds's avatar
Linus Torvalds committed
720 721 722
	5, 6, 7, 8
};

Alan Cox's avatar
Alan Cox committed
723
static void acm_tty_set_termios(struct tty_struct *tty, struct ktermios *termios_old)
Linus Torvalds's avatar
Linus Torvalds committed
724 725
{
	struct acm *acm = tty->driver_data;
Alan Cox's avatar
Alan Cox committed
726
	struct ktermios *termios = tty->termios;
Linus Torvalds's avatar
Linus Torvalds committed
727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762
	struct usb_cdc_line_coding newline;
	int newctrl = acm->ctrlout;

	if (!ACM_READY(acm))
		return;

	newline.dwDTERate = cpu_to_le32p(acm_tty_speed +
		(termios->c_cflag & CBAUD & ~CBAUDEX) + (termios->c_cflag & CBAUDEX ? 15 : 0));
	newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
	newline.bParityType = termios->c_cflag & PARENB ?
		(termios->c_cflag & PARODD ? 1 : 2) + (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
	newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4];

	acm->clocal = ((termios->c_cflag & CLOCAL) != 0);

	if (!newline.dwDTERate) {
		newline.dwDTERate = acm->line.dwDTERate;
		newctrl &= ~ACM_CTRL_DTR;
	} else  newctrl |=  ACM_CTRL_DTR;

	if (newctrl != acm->ctrlout)
		acm_set_control(acm, acm->ctrlout = newctrl);

	if (memcmp(&acm->line, &newline, sizeof newline)) {
		memcpy(&acm->line, &newline, sizeof newline);
		dbg("set line: %d %d %d %d", le32_to_cpu(newline.dwDTERate),
			newline.bCharFormat, newline.bParityType,
			newline.bDataBits);
		acm_set_line(acm, &acm->line);
	}
}

/*
 * USB probe and disconnect routines.
 */

763 764 765 766 767 768
/* Little helper: write buffers free */
static void acm_write_buffers_free(struct acm *acm)
{
	int i;
	struct acm_wb *wb;

769
	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
770 771 772 773 774 775 776 777 778 779
		usb_buffer_free(acm->dev, acm->writesize, wb->buf, wb->dmah);
	}
}

/* Little helper: write buffers allocate */
static int acm_write_buffers_alloc(struct acm *acm)
{
	int i;
	struct acm_wb *wb;

780
	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
781 782 783 784 785 786 787 788 789 790 791 792 793 794 795
		wb->buf = usb_buffer_alloc(acm->dev, acm->writesize, GFP_KERNEL,
		    &wb->dmah);
		if (!wb->buf) {
			while (i != 0) {
				--i;
				--wb;
				usb_buffer_free(acm->dev, acm->writesize,
				    wb->buf, wb->dmah);
			}
			return -ENOMEM;
		}
	}
	return 0;
}

Linus Torvalds's avatar
Linus Torvalds committed
796 797 798 799
static int acm_probe (struct usb_interface *intf,
		      const struct usb_device_id *id)
{
	struct usb_cdc_union_desc *union_header = NULL;
800
	struct usb_cdc_country_functional_desc *cfd = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817
	char *buffer = intf->altsetting->extra;
	int buflen = intf->altsetting->extralen;
	struct usb_interface *control_interface;
	struct usb_interface *data_interface;
	struct usb_endpoint_descriptor *epctrl;
	struct usb_endpoint_descriptor *epread;
	struct usb_endpoint_descriptor *epwrite;
	struct usb_device *usb_dev = interface_to_usbdev(intf);
	struct acm *acm;
	int minor;
	int ctrlsize,readsize;
	u8 *buf;
	u8 ac_management_function = 0;
	u8 call_management_function = 0;
	int call_interface_num = -1;
	int data_interface_num;
	unsigned long quirks;
818
	int num_rx_buf;
819
	int i;
Linus Torvalds's avatar
Linus Torvalds committed
820

821
	/* normal quirks */
Linus Torvalds's avatar
Linus Torvalds committed
822
	quirks = (unsigned long)id->driver_info;
823 824 825
	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;

	/* handle quirks deadly to normal probing*/
Linus Torvalds's avatar
Linus Torvalds committed
826 827 828 829 830 831 832 833 834 835 836 837 838 839
	if (quirks == NO_UNION_NORMAL) {
		data_interface = usb_ifnum_to_if(usb_dev, 1);
		control_interface = usb_ifnum_to_if(usb_dev, 0);
		goto skip_normal_probe;
	}
	
	/* normal probing*/
	if (!buffer) {
		err("Wierd descriptor references\n");
		return -EINVAL;
	}

	if (!buflen) {
		if (intf->cur_altsetting->endpoint->extralen && intf->cur_altsetting->endpoint->extra) {
840
			dev_dbg(&intf->dev,"Seeking extra descriptors on endpoint");
Linus Torvalds's avatar
Linus Torvalds committed
841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863
			buflen = intf->cur_altsetting->endpoint->extralen;
			buffer = intf->cur_altsetting->endpoint->extra;
		} else {
			err("Zero length descriptor references\n");
			return -EINVAL;
		}
	}

	while (buflen > 0) {
		if (buffer [1] != USB_DT_CS_INTERFACE) {
			err("skipping garbage\n");
			goto next_desc;
		}

		switch (buffer [2]) {
			case USB_CDC_UNION_TYPE: /* we've found it */
				if (union_header) {
					err("More than one union descriptor, skipping ...");
					goto next_desc;
				}
				union_header = (struct usb_cdc_union_desc *)
							buffer;
				break;
864 865 866
			case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
				cfd = (struct usb_cdc_country_functional_desc *)buffer;
				break;
Linus Torvalds's avatar
Linus Torvalds committed
867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
			case USB_CDC_HEADER_TYPE: /* maybe check version */ 
				break; /* for now we ignore it */ 
			case USB_CDC_ACM_TYPE:
				ac_management_function = buffer[3];
				break;
			case USB_CDC_CALL_MANAGEMENT_TYPE:
				call_management_function = buffer[3];
				call_interface_num = buffer[4];
				if ((call_management_function & 3) != 3)
					err("This device cannot do calls on its own. It is no modem.");
				break;
				
			default:
				err("Ignoring extra header, type %d, length %d", buffer[2], buffer[0]);
				break;
			}
next_desc:
		buflen -= buffer[0];
		buffer += buffer[0];
	}

	if (!union_header) {
		if (call_interface_num > 0) {
890
			dev_dbg(&intf->dev,"No union descriptor, using call management descriptor");
Linus Torvalds's avatar
Linus Torvalds committed
891 892 893
			data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
			control_interface = intf;
		} else {
894
			dev_dbg(&intf->dev,"No union descriptor, giving up");
Linus Torvalds's avatar
Linus Torvalds committed
895 896 897 898 899 900
			return -ENODEV;
		}
	} else {
		control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
		data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
		if (!control_interface || !data_interface) {
901
			dev_dbg(&intf->dev,"no interfaces");
Linus Torvalds's avatar
Linus Torvalds committed
902 903 904 905 906
			return -ENODEV;
		}
	}
	
	if (data_interface_num != call_interface_num)
907
		dev_dbg(&intf->dev,"Seperate call control interface. That is not fully supported.");
Linus Torvalds's avatar
Linus Torvalds committed
908 909 910 911 912 913 914

skip_normal_probe:

	/*workaround for switched interfaces */
	if (data_interface->cur_altsetting->desc.bInterfaceClass != CDC_DATA_INTERFACE_TYPE) {
		if (control_interface->cur_altsetting->desc.bInterfaceClass == CDC_DATA_INTERFACE_TYPE) {
			struct usb_interface *t;
915
			dev_dbg(&intf->dev,"Your device has switched interfaces.");
Linus Torvalds's avatar
Linus Torvalds committed
916 917 918 919 920 921 922 923

			t = control_interface;
			control_interface = data_interface;
			data_interface = t;
		} else {
			return -EINVAL;
		}
	}
924 925 926 927

	/* Accept probe requests only for the control interface */
	if (intf != control_interface)
		return -ENODEV;
Linus Torvalds's avatar
Linus Torvalds committed
928 929
	
	if (usb_interface_claimed(data_interface)) { /* valid in this context */
930
		dev_dbg(&intf->dev,"The data interface isn't available");
Linus Torvalds's avatar
Linus Torvalds committed
931 932 933 934 935 936 937 938 939 940 941 942 943
		return -EBUSY;
	}


	if (data_interface->cur_altsetting->desc.bNumEndpoints < 2)
		return -EINVAL;

	epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
	epread = &data_interface->cur_altsetting->endpoint[0].desc;
	epwrite = &data_interface->cur_altsetting->endpoint[1].desc;


	/* workaround for switched endpoints */
944
	if (!usb_endpoint_dir_in(epread)) {
Linus Torvalds's avatar
Linus Torvalds committed
945 946
		/* descriptors are swapped */
		struct usb_endpoint_descriptor *t;
947
		dev_dbg(&intf->dev,"The data interface has switched endpoints");
Linus Torvalds's avatar
Linus Torvalds committed
948 949 950 951 952 953 954 955 956 957 958 959 960
		
		t = epread;
		epread = epwrite;
		epwrite = t;
	}
	dbg("interfaces are valid");
	for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++);

	if (minor == ACM_TTY_MINORS) {
		err("no more free acm devices");
		return -ENODEV;
	}

961
	if (!(acm = kzalloc(sizeof(struct acm), GFP_KERNEL))) {
962
		dev_dbg(&intf->dev, "out of memory (acm kzalloc)");
Linus Torvalds's avatar
Linus Torvalds committed
963 964 965 966
		goto alloc_fail;
	}

	ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize);
967
	readsize = le16_to_cpu(epread->wMaxPacketSize)* ( quirks == SINGLE_RX_URB ? 1 : 2);
Linus Torvalds's avatar
Linus Torvalds committed
968 969 970 971 972 973 974 975
	acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize);
	acm->control = control_interface;
	acm->data = data_interface;
	acm->minor = minor;
	acm->dev = usb_dev;
	acm->ctrl_caps = ac_management_function;
	acm->ctrlsize = ctrlsize;
	acm->readsize = readsize;
976
	acm->rx_buflimit = num_rx_buf;
977 978
	acm->urb_task.func = acm_rx_tasklet;
	acm->urb_task.data = (unsigned long) acm;
David Howells's avatar
David Howells committed
979
	INIT_WORK(&acm->work, acm_softint);
Linus Torvalds's avatar
Linus Torvalds committed
980
	spin_lock_init(&acm->throttle_lock);
981
	spin_lock_init(&acm->write_lock);
982
	spin_lock_init(&acm->read_lock);
983
	acm->write_ready = 1;
984
	acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
Linus Torvalds's avatar
Linus Torvalds committed
985 986 987

	buf = usb_buffer_alloc(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
	if (!buf) {
988
		dev_dbg(&intf->dev, "out of memory (ctrl buffer alloc)");
Linus Torvalds's avatar
Linus Torvalds committed
989 990 991 992
		goto alloc_fail2;
	}
	acm->ctrl_buffer = buf;

993
	if (acm_write_buffers_alloc(acm) < 0) {
994
		dev_dbg(&intf->dev, "out of memory (write buffer alloc)");
Linus Torvalds's avatar
Linus Torvalds committed
995 996 997 998 999
		goto alloc_fail4;
	}

	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
	if (!acm->ctrlurb) {
1000
		dev_dbg(&intf->dev, "out of memory (ctrlurb kmalloc)");
Linus Torvalds's avatar
Linus Torvalds committed
1001 1002
		goto alloc_fail5;
	}
1003
	for (i = 0; i < num_rx_buf; i++) {
1004 1005 1006
		struct acm_ru *rcv = &(acm->ru[i]);

		if (!(rcv->urb = usb_alloc_urb(0, GFP_KERNEL))) {
1007
			dev_dbg(&intf->dev, "out of memory (read urbs usb_alloc_urb)");
1008 1009 1010 1011 1012 1013
			goto alloc_fail7;
		}

		rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		rcv->instance = acm;
	}
1014
	for (i = 0; i < num_rx_buf; i++) {
1015 1016 1017
		struct acm_rb *buf = &(acm->rb[i]);

		if (!(buf->base = usb_buffer_alloc(acm->dev, readsize, GFP_KERNEL, &buf->dma))) {
1018
			dev_dbg(&intf->dev, "out of memory (read bufs usb_buffer_alloc)");
1019 1020
			goto alloc_fail7;
		}
Linus Torvalds's avatar
Linus Torvalds committed
1021 1022 1023
	}
	acm->writeurb = usb_alloc_urb(0, GFP_KERNEL);
	if (!acm->writeurb) {
1024
		dev_dbg(&intf->dev, "out of memory (writeurb kmalloc)");
Linus Torvalds's avatar
Linus Torvalds committed
1025 1026 1027
		goto alloc_fail7;
	}

1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
	usb_set_intfdata (intf, acm);

	i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
	if (i < 0)
		goto alloc_fail8;

	if (cfd) { /* export the country data */
		acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
		if (!acm->country_codes)
			goto skip_countries;
		acm->country_code_size = cfd->bLength - 4;
		memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0, cfd->bLength - 4);
		acm->country_rel_date = cfd->iCountryCodeRelDate;

		i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
		if (i < 0) {
			kfree(acm->country_codes);
			goto skip_countries;
		}

		i = device_create_file(&intf->dev, &dev_attr_iCountryCodeRelDate);
		if (i < 0) {
			kfree(acm->country_codes);
			goto skip_countries;
		}
	}

skip_countries:
Linus Torvalds's avatar
Linus Torvalds committed
1056 1057 1058 1059 1060 1061
	usb_fill_int_urb(acm->ctrlurb, usb_dev, usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
			 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm, epctrl->bInterval);
	acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
	acm->ctrlurb->transfer_dma = acm->ctrl_dma;

	usb_fill_bulk_urb(acm->writeurb, usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1062
			  NULL, acm->writesize, acm_write_bulk, acm);
Linus Torvalds's avatar
Linus Torvalds committed
1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074
	acm->writeurb->transfer_flags |= URB_NO_FSBR | URB_NO_TRANSFER_DMA_MAP;

	dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);

	acm_set_control(acm, acm->ctrlout);

	acm->line.dwDTERate = cpu_to_le32(9600);
	acm->line.bDataBits = 8;
	acm_set_line(acm, &acm->line);

	usb_driver_claim_interface(&acm_driver, data_interface, acm);

1075 1076
	usb_get_intf(control_interface);
	tty_register_device(acm_tty_driver, minor, &control_interface->dev);
Linus Torvalds's avatar
Linus Torvalds committed
1077 1078 1079

	acm_table[minor] = acm;

1080 1081 1082
	return 0;
alloc_fail8:
	usb_free_urb(acm->writeurb);
Linus Torvalds's avatar
Linus Torvalds committed
1083
alloc_fail7:
1084
	for (i = 0; i < num_rx_buf; i++)
1085
		usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma);
1086
	for (i = 0; i < num_rx_buf; i++)
1087
		usb_free_urb(acm->ru[i].urb);
Linus Torvalds's avatar
Linus Torvalds committed
1088 1089
	usb_free_urb(acm->ctrlurb);
alloc_fail5:
1090
	acm_write_buffers_free(acm);
Linus Torvalds's avatar
Linus Torvalds committed
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
alloc_fail4:
	usb_buffer_free(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
alloc_fail2:
	kfree(acm);
alloc_fail:
	return -ENOMEM;
}

static void acm_disconnect(struct usb_interface *intf)
{
1101
	struct acm *acm = usb_get_intfdata(intf);
Linus Torvalds's avatar
Linus Torvalds committed
1102
	struct usb_device *usb_dev = interface_to_usbdev(intf);
1103
	int i;
Linus Torvalds's avatar
Linus Torvalds committed
1104 1105 1106 1107 1108 1109

	if (!acm || !acm->dev) {
		dbg("disconnect on nonexisting interface");
		return;
	}

1110
	mutex_lock(&open_mutex);
1111
	if (!usb_get_intfdata(intf)) {
1112
		mutex_unlock(&open_mutex);
1113 1114
		return;
	}
1115
	if (acm->country_codes){
1116 1117 1118 1119
		device_remove_file(&acm->control->dev,
				&dev_attr_wCountryCodes);
		device_remove_file(&acm->control->dev,
				&dev_attr_iCountryCodeRelDate);
1120
	}
1121
	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
Linus Torvalds's avatar
Linus Torvalds committed
1122
	acm->dev = NULL;
1123 1124
	usb_set_intfdata(acm->control, NULL);
	usb_set_intfdata(acm->data, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
1125

1126 1127
	tasklet_disable(&acm->urb_task);

Linus Torvalds's avatar
Linus Torvalds committed
1128 1129
	usb_kill_urb(acm->ctrlurb);
	usb_kill_urb(acm->writeurb);
1130
	for (i = 0; i < acm->rx_buflimit; i++)
1131 1132 1133 1134 1135 1136
		usb_kill_urb(acm->ru[i].urb);

	INIT_LIST_HEAD(&acm->filled_read_bufs);
	INIT_LIST_HEAD(&acm->spare_read_bufs);

	tasklet_enable(&acm->urb_task);
Linus Torvalds's avatar
Linus Torvalds committed
1137 1138 1139

	flush_scheduled_work(); /* wait for acm_softint */

1140
	acm_write_buffers_free(acm);
Linus Torvalds's avatar
Linus Torvalds committed
1141
	usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1142
	for (i = 0; i < acm->rx_buflimit; i++)
1143
		usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma);
Linus Torvalds's avatar
Linus Torvalds committed
1144

1145
	usb_driver_release_interface(&acm_driver, intf == acm->control ? acm->data : intf);
Linus Torvalds's avatar
Linus Torvalds committed
1146 1147

	if (!acm->used) {
1148
		acm_tty_unregister(acm);
1149
		mutex_unlock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
1150 1151 1152
		return;
	}

1153
	mutex_unlock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167

	if (acm->tty)
		tty_hangup(acm->tty);
}

/*
 * USB driver structure.
 */

static struct usb_device_id acm_ids[] = {
	/* quirky and broken devices */
	{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1168 1169 1170
	{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1171 1172 1173
	{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1174 1175 1176
	{ USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1177 1178 1179
	{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
	.driver_info = SINGLE_RX_URB, /* firmware bug */
	},
1180 1181 1182
	{ USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
	.driver_info = SINGLE_RX_URB, /* firmware bug */
	},
Oliver Neukum's avatar
Oliver Neukum committed
1183 1184 1185 1186
	{ USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},

Linus Torvalds's avatar
Linus Torvalds committed
1187