cdc-acm.c 31.1 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 62
 */

/*
 * 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>
#include <linux/smp_lock.h>
63
#include <linux/mutex.h>
Linus Torvalds's avatar
Linus Torvalds committed
64 65
#include <asm/uaccess.h>
#include <linux/usb.h>
66
#include <linux/usb/cdc.h>
Linus Torvalds's avatar
Linus Torvalds committed
67 68
#include <asm/byteorder.h>
#include <asm/unaligned.h>
69
#include <linux/list.h>
Linus Torvalds's avatar
Linus Torvalds committed
70 71 72 73 74 75

#include "cdc-acm.h"

/*
 * Version Information
 */
76 77
#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
78 79 80 81 82 83
#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];

84
static DEFINE_MUTEX(open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111

#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)

112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129
/*
 * 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;
		}
130 131
		wbn = (wbn + 1) % ACM_NW;
		if (++i >= ACM_NW)
132 133 134 135 136 137 138 139 140 141 142 143 144
			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;

145 146 147
	n = ACM_NW;
	for (i = 0; i < ACM_NW; i++) {
		n -= acm->wb[i].use;
148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168
	}
	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);
169
	acm->write_current = (wbn + 1) % ACM_NW;
170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215
	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;
}

Linus Torvalds's avatar
Linus Torvalds committed
216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289
/*
 * Interrupt handlers for various ACM device responses
 */

/* control interface reports status changes with "interrupt" transfers */
static void acm_ctrl_irq(struct urb *urb, struct pt_regs *regs)
{
	struct acm *acm = urb->context;
	struct usb_cdc_notification *dr = urb->transfer_buffer;
	unsigned char *data;
	int newctrl;
	int status;

	switch (urb->status) {
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
		dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
		return;
	default:
		dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
		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:
	status = usb_submit_urb (urb, GFP_ATOMIC);
	if (status)
		err ("%s - usb_submit_urb failed with result %d",
		     __FUNCTION__, status);
}

/* data interface returns incoming bytes, or we got unthrottled */
static void acm_read_bulk(struct urb *urb, struct pt_regs *regs)
{
290 291 292
	struct acm_rb *buf;
	struct acm_ru *rcv = urb->context;
	struct acm *acm = rcv->instance;
293
	int status = urb->status;
Linus Torvalds's avatar
Linus Torvalds committed
294 295 296 297 298
	dbg("Entering acm_read_bulk with status %d\n", urb->status);

	if (!ACM_READY(acm))
		return;

299 300
	if (status)
		dev_dbg(&acm->data->dev, "bulk rx status %d\n", status);
Linus Torvalds's avatar
Linus Torvalds committed
301

302 303 304
	buf = rcv->buffer;
	buf->size = urb->actual_length;

305 306 307 308 309 310 311 312 313 314 315 316 317 318
	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 */
	}
319
	tasklet_schedule(&acm->urb_task);
Linus Torvalds's avatar
Linus Torvalds committed
320 321 322 323 324
}

static void acm_rx_tasklet(unsigned long _acm)
{
	struct acm *acm = (void *)_acm;
325
	struct acm_rb *buf;
Linus Torvalds's avatar
Linus Torvalds committed
326
	struct tty_struct *tty = acm->tty;
327 328
	struct acm_ru *rcv;
	//unsigned long flags;
Linus Torvalds's avatar
Linus Torvalds committed
329 330 331
	int i = 0;
	dbg("Entering acm_rx_tasklet");

332 333 334 335 336 337 338 339
	if (!ACM_READY(acm) || acm->throttle)
		return;

next_buffer:
	spin_lock(&acm->read_lock);
	if (list_empty(&acm->filled_read_bufs)) {
		spin_unlock(&acm->read_lock);
		goto urbs;
Linus Torvalds's avatar
Linus Torvalds committed
340
	}
341 342 343 344 345 346 347
	buf = list_entry(acm->filled_read_bufs.next,
			 struct acm_rb, list);
	list_del(&buf->list);
	spin_unlock(&acm->read_lock);

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

Alan Cox's avatar
Alan Cox committed
348 349 350
	tty_buffer_request_room(tty, buf->size);
	if (!acm->throttle)
		tty_insert_flip_string(tty, buf->base, buf->size);
351
	tty_flip_buffer_push(tty);
Linus Torvalds's avatar
Linus Torvalds committed
352 353 354 355

	spin_lock(&acm->throttle_lock);
	if (acm->throttle) {
		dbg("Throtteling noticed");
356 357
		memmove(buf->base, buf->base + i, buf->size - i);
		buf->size -= i;
Linus Torvalds's avatar
Linus Torvalds committed
358
		spin_unlock(&acm->throttle_lock);
359 360 361
		spin_lock(&acm->read_lock);
		list_add(&buf->list, &acm->filled_read_bufs);
		spin_unlock(&acm->read_lock);
Linus Torvalds's avatar
Linus Torvalds committed
362 363 364 365
		return;
	}
	spin_unlock(&acm->throttle_lock);

366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408
	spin_lock(&acm->read_lock);
	list_add(&buf->list, &acm->spare_read_bufs);
	spin_unlock(&acm->read_lock);
	goto next_buffer;

urbs:
	while (!list_empty(&acm->spare_read_bufs)) {
		spin_lock(&acm->read_lock);
		if (list_empty(&acm->spare_read_urbs)) {
			spin_unlock(&acm->read_lock);
			return;
		}
		rcv = list_entry(acm->spare_read_urbs.next,
				 struct acm_ru, list);
		list_del(&rcv->list);
		spin_unlock(&acm->read_lock);

		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;

		dbg("acm_rx_tasklet: sending urb 0x%p, rcv 0x%p, buf 0x%p\n", rcv->urb, rcv, buf);

		/* 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);
			spin_lock(&acm->read_lock);
			list_add(&rcv->list, &acm->spare_read_urbs);
			spin_unlock(&acm->read_lock);
			return;
		}
	}
Linus Torvalds's avatar
Linus Torvalds committed
409 410 411 412 413 414 415
}

/* data interface wrote those outgoing bytes */
static void acm_write_bulk(struct urb *urb, struct pt_regs *regs)
{
	struct acm *acm = (struct acm *)urb->context;

416
	dbg("Entering acm_write_bulk with status %d\n", urb->status);
Linus Torvalds's avatar
Linus Torvalds committed
417

418 419 420 421
	acm_write_done(acm);
	acm_write_start(acm);
	if (ACM_READY(acm))
		schedule_work(&acm->work);
Linus Torvalds's avatar
Linus Torvalds committed
422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441
}

static void acm_softint(void *private)
{
	struct acm *acm = private;
	dbg("Entering acm_softint.\n");
	
	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;
442
	int i;
Linus Torvalds's avatar
Linus Torvalds committed
443
	dbg("Entering acm_tty_open.\n");
444 445

	mutex_lock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
446 447 448 449 450 451 452 453 454 455

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

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

456 457 458
	/* 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
459 460 461 462 463 464 465 466 467 468 469 470 471 472

	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;
	}

	if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS))
		goto full_bailout;

473 474 475
	INIT_LIST_HEAD(&acm->spare_read_urbs);
	INIT_LIST_HEAD(&acm->spare_read_bufs);
	INIT_LIST_HEAD(&acm->filled_read_bufs);
476
	for (i = 0; i < acm->rx_buflimit; i++) {
477 478
		list_add(&(acm->ru[i].list), &acm->spare_read_urbs);
	}
479
	for (i = 0; i < acm->rx_buflimit; i++) {
480 481 482 483
		list_add(&(acm->rb[i].list), &acm->spare_read_bufs);
	}

	tasklet_schedule(&acm->urb_task);
Linus Torvalds's avatar
Linus Torvalds committed
484 485 486

done:
err_out:
487
	mutex_unlock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
488 489 490 491 492 493
	return rv;

full_bailout:
	usb_kill_urb(acm->ctrlurb);
bail_out:
	acm->used--;
494
	mutex_unlock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
495 496 497
	return -EIO;
}

498 499
static void acm_tty_unregister(struct acm *acm)
{
500
	int i,nr;
501

502
	nr = acm->rx_buflimit;
503 504 505 506 507
	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);
508
	for (i = 0; i < nr; i++)
509
		usb_free_urb(acm->ru[i].urb);
510 511 512
	kfree(acm);
}

Linus Torvalds's avatar
Linus Torvalds committed
513 514 515
static void acm_tty_close(struct tty_struct *tty, struct file *filp)
{
	struct acm *acm = tty->driver_data;
516
	int i,nr;
Linus Torvalds's avatar
Linus Torvalds committed
517 518 519 520

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

521
	nr = acm->rx_buflimit;
522
	mutex_lock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
523 524 525 526 527
	if (!--acm->used) {
		if (acm->dev) {
			acm_set_control(acm, acm->ctrlout = 0);
			usb_kill_urb(acm->ctrlurb);
			usb_kill_urb(acm->writeurb);
528
			for (i = 0; i < nr; i++)
529
				usb_kill_urb(acm->ru[i].urb);
530 531
		} else
			acm_tty_unregister(acm);
Linus Torvalds's avatar
Linus Torvalds committed
532
	}
533
	mutex_unlock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
534 535 536 537 538 539
}

static int acm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
	struct acm *acm = tty->driver_data;
	int stat;
540 541 542 543
	unsigned long flags;
	int wbn;
	struct acm_wb *wb;

Linus Torvalds's avatar
Linus Torvalds committed
544 545 546 547 548 549 550
	dbg("Entering acm_tty_write to write %d bytes,\n", count);

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

551 552 553 554 555 556 557
	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
558

559
	count = (count > acm->writesize) ? acm->writesize : count;
Linus Torvalds's avatar
Linus Torvalds committed
560
	dbg("Get %d bytes...", count);
561 562 563
	memcpy(wb->buf, buf, count);
	wb->len = count;
	spin_unlock_irqrestore(&acm->write_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
564

565
	if ((stat = acm_write_start(acm)) < 0)
Linus Torvalds's avatar
Linus Torvalds committed
566 567 568 569 570 571 572 573 574
		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;
575 576 577 578 579
	/*
	 * 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
580 581 582 583 584 585 586
}

static int acm_tty_chars_in_buffer(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	if (!ACM_READY(acm))
		return -EINVAL;
587 588 589
	/*
	 * This is inaccurate (overcounts), but it works.
	 */
590
	return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
Linus Torvalds's avatar
Linus Torvalds committed
591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610
}

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);
611
	tasklet_schedule(&acm->urb_task);
Linus Torvalds's avatar
Linus Torvalds committed
612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667
}

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;
}

668
static const __u32 acm_tty_speed[] = {
Linus Torvalds's avatar
Linus Torvalds committed
669 670 671 672 673 674 675
	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
};

676
static const __u8 acm_tty_size[] = {
Linus Torvalds's avatar
Linus Torvalds committed
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719
	5, 6, 7, 8
};

static void acm_tty_set_termios(struct tty_struct *tty, struct termios *termios_old)
{
	struct acm *acm = tty->driver_data;
	struct termios *termios = tty->termios;
	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.
 */

720 721 722 723 724 725
/* Little helper: write buffers free */
static void acm_write_buffers_free(struct acm *acm)
{
	int i;
	struct acm_wb *wb;

726
	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
727 728 729 730 731 732 733 734 735 736
		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;

737
	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
738 739 740 741 742 743 744 745 746 747 748 749 750 751 752
		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
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
static int acm_probe (struct usb_interface *intf,
		      const struct usb_device_id *id)
{
	struct usb_cdc_union_desc *union_header = NULL;
	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;
774
	int num_rx_buf;
775
	int i;
Linus Torvalds's avatar
Linus Torvalds committed
776

777
	/* normal quirks */
Linus Torvalds's avatar
Linus Torvalds committed
778
	quirks = (unsigned long)id->driver_info;
779 780 781
	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;

	/* handle quirks deadly to normal probing*/
Linus Torvalds's avatar
Linus Torvalds committed
782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911
	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) {
			dev_dbg(&intf->dev,"Seeking extra descriptors on endpoint\n");
			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;
			case USB_CDC_COUNTRY_TYPE: /* maybe somehow export */
				break; /* for now we ignore it */
			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) {
			dev_dbg(&intf->dev,"No union descriptor, using call management descriptor\n");
			data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
			control_interface = intf;
		} else {
			dev_dbg(&intf->dev,"No union descriptor, giving up\n");
			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) {
			dev_dbg(&intf->dev,"no interfaces\n");
			return -ENODEV;
		}
	}
	
	if (data_interface_num != call_interface_num)
		dev_dbg(&intf->dev,"Seperate call control interface. That is not fully supported.\n");

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;
			dev_dbg(&intf->dev,"Your device has switched interfaces.\n");

			t = control_interface;
			control_interface = data_interface;
			data_interface = t;
		} else {
			return -EINVAL;
		}
	}
	
	if (usb_interface_claimed(data_interface)) { /* valid in this context */
		dev_dbg(&intf->dev,"The data interface isn't available\n");
		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 */
	if ((epread->bEndpointAddress & USB_DIR_IN) != USB_DIR_IN) {
		/* descriptors are swapped */
		struct usb_endpoint_descriptor *t;
		dev_dbg(&intf->dev,"The data interface has switched endpoints\n");
		
		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;
	}

912 913
	if (!(acm = kzalloc(sizeof(struct acm), GFP_KERNEL))) {
		dev_dbg(&intf->dev, "out of memory (acm kzalloc)\n");
Linus Torvalds's avatar
Linus Torvalds committed
914 915 916 917
		goto alloc_fail;
	}

	ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize);
918
	readsize = le16_to_cpu(epread->wMaxPacketSize)* ( quirks == SINGLE_RX_URB ? 1 : 2);
Linus Torvalds's avatar
Linus Torvalds committed
919 920 921 922 923 924 925 926
	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;
927
	acm->rx_buflimit = num_rx_buf;
928 929
	acm->urb_task.func = acm_rx_tasklet;
	acm->urb_task.data = (unsigned long) acm;
Linus Torvalds's avatar
Linus Torvalds committed
930 931
	INIT_WORK(&acm->work, acm_softint, acm);
	spin_lock_init(&acm->throttle_lock);
932
	spin_lock_init(&acm->write_lock);
933
	spin_lock_init(&acm->read_lock);
934
	acm->write_ready = 1;
935
	acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
Linus Torvalds's avatar
Linus Torvalds committed
936 937 938 939 940 941 942 943

	buf = usb_buffer_alloc(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
	if (!buf) {
		dev_dbg(&intf->dev, "out of memory (ctrl buffer alloc)\n");
		goto alloc_fail2;
	}
	acm->ctrl_buffer = buf;

944
	if (acm_write_buffers_alloc(acm) < 0) {
Linus Torvalds's avatar
Linus Torvalds committed
945 946 947 948 949 950 951 952 953
		dev_dbg(&intf->dev, "out of memory (write buffer alloc)\n");
		goto alloc_fail4;
	}

	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
	if (!acm->ctrlurb) {
		dev_dbg(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
		goto alloc_fail5;
	}
954
	for (i = 0; i < num_rx_buf; i++) {
955 956 957 958 959 960 961 962 963 964
		struct acm_ru *rcv = &(acm->ru[i]);

		if (!(rcv->urb = usb_alloc_urb(0, GFP_KERNEL))) {
			dev_dbg(&intf->dev, "out of memory (read urbs usb_alloc_urb)\n");
			goto alloc_fail7;
		}

		rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		rcv->instance = acm;
	}
965
	for (i = 0; i < num_rx_buf; i++) {
966 967 968 969 970 971
		struct acm_rb *buf = &(acm->rb[i]);

		if (!(buf->base = usb_buffer_alloc(acm->dev, readsize, GFP_KERNEL, &buf->dma))) {
			dev_dbg(&intf->dev, "out of memory (read bufs usb_buffer_alloc)\n");
			goto alloc_fail7;
		}
Linus Torvalds's avatar
Linus Torvalds committed
972 973 974 975 976 977 978 979 980 981 982 983 984
	}
	acm->writeurb = usb_alloc_urb(0, GFP_KERNEL);
	if (!acm->writeurb) {
		dev_dbg(&intf->dev, "out of memory (writeurb kmalloc)\n");
		goto alloc_fail7;
	}

	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),
985
			  NULL, acm->writesize, acm_write_bulk, acm);
Linus Torvalds's avatar
Linus Torvalds committed
986 987 988 989 990 991 992 993 994 995 996 997
	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);

998 999
	usb_get_intf(control_interface);
	tty_register_device(acm_tty_driver, minor, &control_interface->dev);
Linus Torvalds's avatar
Linus Torvalds committed
1000 1001 1002 1003 1004 1005

	acm_table[minor] = acm;
	usb_set_intfdata (intf, acm);
	return 0;

alloc_fail7:
1006
	for (i = 0; i < num_rx_buf; i++)
1007
		usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma);
1008
	for (i = 0; i < num_rx_buf; i++)
1009
		usb_free_urb(acm->ru[i].urb);
Linus Torvalds's avatar
Linus Torvalds committed
1010 1011
	usb_free_urb(acm->ctrlurb);
alloc_fail5:
1012
	acm_write_buffers_free(acm);
Linus Torvalds's avatar
Linus Torvalds committed
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024
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)
{
	struct acm *acm = usb_get_intfdata (intf);
	struct usb_device *usb_dev = interface_to_usbdev(intf);
1025
	int i;
Linus Torvalds's avatar
Linus Torvalds committed
1026 1027 1028 1029 1030 1031

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

1032
	mutex_lock(&open_mutex);
1033
	if (!usb_get_intfdata(intf)) {
1034
		mutex_unlock(&open_mutex);
1035 1036
		return;
	}
Linus Torvalds's avatar
Linus Torvalds committed
1037
	acm->dev = NULL;
1038 1039
	usb_set_intfdata(acm->control, NULL);
	usb_set_intfdata(acm->data, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
1040

1041 1042
	tasklet_disable(&acm->urb_task);

Linus Torvalds's avatar
Linus Torvalds committed
1043 1044
	usb_kill_urb(acm->ctrlurb);
	usb_kill_urb(acm->writeurb);
1045
	for (i = 0; i < acm->rx_buflimit; i++)
1046 1047 1048 1049 1050 1051
		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
1052 1053 1054

	flush_scheduled_work(); /* wait for acm_softint */

1055
	acm_write_buffers_free(acm);
Linus Torvalds's avatar
Linus Torvalds committed
1056
	usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1057
	for (i = 0; i < acm->rx_buflimit; i++)
1058
		usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma);
Linus Torvalds's avatar
Linus Torvalds committed
1059

1060
	usb_driver_release_interface(&acm_driver, intf == acm->control ? acm->data : intf);
Linus Torvalds's avatar
Linus Torvalds committed
1061 1062

	if (!acm->used) {
1063
		acm_tty_unregister(acm);
1064
		mutex_unlock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
1065 1066 1067
		return;
	}

1068
	mutex_unlock(&open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082

	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 */
	},
1083 1084 1085
	{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1086 1087 1088
	{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
	.driver_info = SINGLE_RX_URB, /* firmware bug */
	},
Linus Torvalds's avatar
Linus Torvalds committed
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
	/* control interfaces with various AT-command sets */
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_V25TER) },
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_PCCA101) },
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_GSM) },
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_3G	) },
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_CDMA) },

	/* NOTE:  COMM/ACM/0xff is likely MSFT RNDIS ... NOT a modem!! */
	{ }
};

MODULE_DEVICE_TABLE (usb, acm_ids);

static struct usb_driver acm_driver = {
	.name =		"cdc_acm",
	.probe =	acm_probe,
	.disconnect =	acm_disconnect,
	.id_table =	acm_ids,
};

/*
 * TTY driver structures.
 */

static struct tty_operations acm_ops = {
	.open =			acm_tty_open,
	.close =		acm_tty_close,
	.write =		acm_tty_write,
	.write_room =		acm_tty_write_room,
	.ioctl =		acm_tty_ioctl,
	.throttle =		acm_tty_throttle,
	.unthrottle =		acm_tty_unthrottle,
	.chars_in_buffer =	acm_tty_chars_in_buffer,
	.break_ctl =		acm_tty_break_ctl,
	.set_termios =		acm_tty_set_termios,
	.tiocmget =		acm_tty_tiocmget,
	.tiocmset =		acm_tty_tiocmset,
};

/*
 * Init / exit.
 */

static int __init acm_init(void)
{
	int retval;
	acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
	if (!acm_tty_driver)
		return -ENOMEM;
	acm_tty_driver->owner = THIS_MODULE,
	acm_tty_driver->driver_name = "acm",
	acm_tty_driver->name = "ttyACM",
	acm_tty_driver->major = ACM_TTY_MAJOR,
	acm_tty_driver->minor_start = 0,
	acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
	acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1152
	acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
Linus Torvalds's avatar
Linus Torvalds committed
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
	acm_tty_driver->init_termios = tty_std_termios;
	acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
	tty_set_operations(acm_tty_driver, &acm_ops);

	retval = tty_register_driver(acm_tty_driver);
	if (retval) {
		put_tty_driver(acm_tty_driver);
		return retval;
	}

	retval = usb_register(&acm_driver);
	if (retval) {
		tty_unregister_driver(acm_tty_driver);
		put_tty_driver(acm_tty_driver);
		return retval;
	}

	info(DRIVER_VERSION ":" DRIVER_DESC);

	return 0;
}

static void __exit acm_exit(void)
{
	usb_deregister(&acm_driver);
	tty_unregister_driver(acm_tty_driver);
	put_tty_driver(acm_tty_driver);
}

module_init(acm_init);
module_exit(acm_exit);

MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");