1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * cdc-acm.c
   4 *
   5 * Copyright (c) 1999 Armin Fuerst	<fuerst@in.tum.de>
   6 * Copyright (c) 1999 Pavel Machek	<pavel@ucw.cz>
   7 * Copyright (c) 1999 Johannes Erdfelt	<johannes@erdfelt.com>
   8 * Copyright (c) 2000 Vojtech Pavlik	<vojtech@suse.cz>
   9 * Copyright (c) 2004 Oliver Neukum	<oliver@neukum.name>
  10 * Copyright (c) 2005 David Kubicek	<dave@awk.cz>
  11 * Copyright (c) 2011 Johan Hovold	<jhovold@gmail.com>
  12 *
  13 * USB Abstract Control Model driver for USB modems and ISDN adapters
  14 *
  15 * Sponsored by SuSE
  16 */
  17
  18#undef DEBUG
  19#undef VERBOSE_DEBUG
  20
  21#include <linux/kernel.h>
  22#include <linux/sched/signal.h>
  23#include <linux/errno.h>
  24#include <linux/init.h>
  25#include <linux/slab.h>
  26#include <linux/log2.h>
  27#include <linux/tty.h>
  28#include <linux/serial.h>
  29#include <linux/tty_driver.h>
  30#include <linux/tty_flip.h>
  31#include <linux/module.h>
  32#include <linux/mutex.h>
  33#include <linux/uaccess.h>
  34#include <linux/usb.h>
  35#include <linux/usb/cdc.h>
  36#include <asm/byteorder.h>
  37#include <asm/unaligned.h>
  38#include <linux/idr.h>
  39#include <linux/list.h>
  40
  41#include "cdc-acm.h"
  42
  43
  44#define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  45#define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  46
  47static struct usb_driver acm_driver;
  48static struct tty_driver *acm_tty_driver;
  49
  50static DEFINE_IDR(acm_minors);
  51static DEFINE_MUTEX(acm_minors_lock);
  52
  53static void acm_tty_set_termios(struct tty_struct *tty,
  54				struct ktermios *termios_old);
  55
  56/*
  57 * acm_minors accessors
  58 */
  59
  60/*
  61 * Look up an ACM structure by minor. If found and not disconnected, increment
  62 * its refcount and return it with its mutex held.
  63 */
  64static struct acm *acm_get_by_minor(unsigned int minor)
  65{
  66	struct acm *acm;
  67
  68	mutex_lock(&acm_minors_lock);
  69	acm = idr_find(&acm_minors, minor);
  70	if (acm) {
  71		mutex_lock(&acm->mutex);
  72		if (acm->disconnected) {
  73			mutex_unlock(&acm->mutex);
  74			acm = NULL;
  75		} else {
  76			tty_port_get(&acm->port);
  77			mutex_unlock(&acm->mutex);
  78		}
  79	}
  80	mutex_unlock(&acm_minors_lock);
  81	return acm;
  82}
  83
  84/*
  85 * Try to find an available minor number and if found, associate it with 'acm'.
  86 */
  87static int acm_alloc_minor(struct acm *acm)
  88{
  89	int minor;
  90
  91	mutex_lock(&acm_minors_lock);
  92	minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
  93	mutex_unlock(&acm_minors_lock);
  94
  95	return minor;
  96}
  97
  98/* Release the minor number associated with 'acm'.  */
  99static void acm_release_minor(struct acm *acm)
 100{
 101	mutex_lock(&acm_minors_lock);
 102	idr_remove(&acm_minors, acm->minor);
 103	mutex_unlock(&acm_minors_lock);
 104}
 105
 106/*
 107 * Functions for ACM control messages.
 108 */
 109
 110static int acm_ctrl_msg(struct acm *acm, int request, int value,
 111							void *buf, int len)
 112{
 113	int retval;
 114
 115	retval = usb_autopm_get_interface(acm->control);
 116	if (retval)
 117		return retval;
 118
 119	retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 120		request, USB_RT_ACM, value,
 121		acm->control->altsetting[0].desc.bInterfaceNumber,
 122		buf, len, 5000);
 123
 124	dev_dbg(&acm->control->dev,
 125		"%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 126		__func__, request, value, len, retval);
 127
 128	usb_autopm_put_interface(acm->control);
 129
 130	return retval < 0 ? retval : 0;
 131}
 132
 133/* devices aren't required to support these requests.
 134 * the cdc acm descriptor tells whether they do...
 135 */
 136static inline int acm_set_control(struct acm *acm, int control)
 137{
 138	if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
 139		return -EOPNOTSUPP;
 140
 141	return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
 142			control, NULL, 0);
 143}
 144
 145#define acm_set_line(acm, line) \
 146	acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 147#define acm_send_break(acm, ms) \
 148	acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 149
 150static void acm_kill_urbs(struct acm *acm)
 151{
 152	int i;
 153
 154	usb_kill_urb(acm->ctrlurb);
 155	for (i = 0; i < ACM_NW; i++)
 156		usb_kill_urb(acm->wb[i].urb);
 157	for (i = 0; i < acm->rx_buflimit; i++)
 158		usb_kill_urb(acm->read_urbs[i]);
 159}
 160
 161/*
 162 * Write buffer management.
 163 * All of these assume proper locks taken by the caller.
 164 */
 165
 166static int acm_wb_alloc(struct acm *acm)
 167{
 168	int i, wbn;
 169	struct acm_wb *wb;
 170
 171	wbn = 0;
 172	i = 0;
 173	for (;;) {
 174		wb = &acm->wb[wbn];
 175		if (!wb->use) {
 176			wb->use = 1;
 177			wb->len = 0;
 178			return wbn;
 179		}
 180		wbn = (wbn + 1) % ACM_NW;
 181		if (++i >= ACM_NW)
 182			return -1;
 183	}
 184}
 185
 186static int acm_wb_is_avail(struct acm *acm)
 187{
 188	int i, n;
 189	unsigned long flags;
 190
 191	n = ACM_NW;
 192	spin_lock_irqsave(&acm->write_lock, flags);
 193	for (i = 0; i < ACM_NW; i++)
 194		n -= acm->wb[i].use;
 195	spin_unlock_irqrestore(&acm->write_lock, flags);
 196	return n;
 197}
 198
 199/*
 200 * Finish write. Caller must hold acm->write_lock
 201 */
 202static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 203{
 204	wb->use = 0;
 205	acm->transmitting--;
 206	usb_autopm_put_interface_async(acm->control);
 207}
 208
 209/*
 210 * Poke write.
 211 *
 212 * the caller is responsible for locking
 213 */
 214
 215static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 216{
 217	int rc;
 218
 219	acm->transmitting++;
 220
 221	wb->urb->transfer_buffer = wb->buf;
 222	wb->urb->transfer_dma = wb->dmah;
 223	wb->urb->transfer_buffer_length = wb->len;
 224	wb->urb->dev = acm->dev;
 225
 226	rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 227	if (rc < 0) {
 228		dev_err(&acm->data->dev,
 229			"%s - usb_submit_urb(write bulk) failed: %d\n",
 230			__func__, rc);
 231		acm_write_done(acm, wb);
 232	}
 233	return rc;
 234}
 235
 236/*
 237 * attributes exported through sysfs
 238 */
 239static ssize_t bmCapabilities_show
 240(struct device *dev, struct device_attribute *attr, char *buf)
 241{
 242	struct usb_interface *intf = to_usb_interface(dev);
 243	struct acm *acm = usb_get_intfdata(intf);
 244
 245	return sprintf(buf, "%d", acm->ctrl_caps);
 246}
 247static DEVICE_ATTR_RO(bmCapabilities);
 248
 249static ssize_t wCountryCodes_show
 250(struct device *dev, struct device_attribute *attr, char *buf)
 251{
 252	struct usb_interface *intf = to_usb_interface(dev);
 253	struct acm *acm = usb_get_intfdata(intf);
 254
 255	memcpy(buf, acm->country_codes, acm->country_code_size);
 256	return acm->country_code_size;
 257}
 258
 259static DEVICE_ATTR_RO(wCountryCodes);
 260
 261static ssize_t iCountryCodeRelDate_show
 262(struct device *dev, struct device_attribute *attr, char *buf)
 263{
 264	struct usb_interface *intf = to_usb_interface(dev);
 265	struct acm *acm = usb_get_intfdata(intf);
 266
 267	return sprintf(buf, "%d", acm->country_rel_date);
 268}
 269
 270static DEVICE_ATTR_RO(iCountryCodeRelDate);
 271/*
 272 * Interrupt handlers for various ACM device responses
 273 */
 274
 275static void acm_process_notification(struct acm *acm, unsigned char *buf)
 276{
 277	int newctrl;
 278	int difference;
 279	unsigned long flags;
 280	struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
 281	unsigned char *data = buf + sizeof(struct usb_cdc_notification);
 282
 283	switch (dr->bNotificationType) {
 284	case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 285		dev_dbg(&acm->control->dev,
 286			"%s - network connection: %d\n", __func__, dr->wValue);
 287		break;
 288
 289	case USB_CDC_NOTIFY_SERIAL_STATE:
 290		if (le16_to_cpu(dr->wLength) != 2) {
 291			dev_dbg(&acm->control->dev,
 292				"%s - malformed serial state\n", __func__);
 293			break;
 294		}
 295
 296		newctrl = get_unaligned_le16(data);
 297		dev_dbg(&acm->control->dev,
 298			"%s - serial state: 0x%x\n", __func__, newctrl);
 299
 300		if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 301			dev_dbg(&acm->control->dev,
 302				"%s - calling hangup\n", __func__);
 303			tty_port_tty_hangup(&acm->port, false);
 304		}
 305
 306		difference = acm->ctrlin ^ newctrl;
 307		spin_lock_irqsave(&acm->read_lock, flags);
 308		acm->ctrlin = newctrl;
 309		acm->oldcount = acm->iocount;
 310
 311		if (difference & ACM_CTRL_DSR)
 312			acm->iocount.dsr++;
 313		if (difference & ACM_CTRL_DCD)
 314			acm->iocount.dcd++;
 315		if (newctrl & ACM_CTRL_BRK)
 316			acm->iocount.brk++;
 317		if (newctrl & ACM_CTRL_RI)
 318			acm->iocount.rng++;
 319		if (newctrl & ACM_CTRL_FRAMING)
 320			acm->iocount.frame++;
 321		if (newctrl & ACM_CTRL_PARITY)
 322			acm->iocount.parity++;
 323		if (newctrl & ACM_CTRL_OVERRUN)
 324			acm->iocount.overrun++;
 325		spin_unlock_irqrestore(&acm->read_lock, flags);
 326
 327		if (difference)
 328			wake_up_all(&acm->wioctl);
 329
 330		break;
 331
 332	default:
 333		dev_dbg(&acm->control->dev,
 334			"%s - unknown notification %d received: index %d len %d\n",
 335			__func__,
 336			dr->bNotificationType, dr->wIndex, dr->wLength);
 337	}
 338}
 339
 340/* control interface reports status changes with "interrupt" transfers */
 341static void acm_ctrl_irq(struct urb *urb)
 342{
 343	struct acm *acm = urb->context;
 344	struct usb_cdc_notification *dr = urb->transfer_buffer;
 345	unsigned int current_size = urb->actual_length;
 346	unsigned int expected_size, copy_size, alloc_size;
 347	int retval;
 348	int status = urb->status;
 349
 350	switch (status) {
 351	case 0:
 352		/* success */
 353		break;
 354	case -ECONNRESET:
 355	case -ENOENT:
 356	case -ESHUTDOWN:
 357		/* this urb is terminated, clean up */
 358		dev_dbg(&acm->control->dev,
 359			"%s - urb shutting down with status: %d\n",
 360			__func__, status);
 361		return;
 362	default:
 363		dev_dbg(&acm->control->dev,
 364			"%s - nonzero urb status received: %d\n",
 365			__func__, status);
 366		goto exit;
 367	}
 368
 369	usb_mark_last_busy(acm->dev);
 370
 371	if (acm->nb_index)
 372		dr = (struct usb_cdc_notification *)acm->notification_buffer;
 373
 374	/* size = notification-header + (optional) data */
 375	expected_size = sizeof(struct usb_cdc_notification) +
 376					le16_to_cpu(dr->wLength);
 377
 378	if (current_size < expected_size) {
 379		/* notification is transmitted fragmented, reassemble */
 380		if (acm->nb_size < expected_size) {
 381			u8 *new_buffer;
 
 
 
 382			alloc_size = roundup_pow_of_two(expected_size);
 383			/* Final freeing is done on disconnect. */
 384			new_buffer = krealloc(acm->notification_buffer,
 385					      alloc_size, GFP_ATOMIC);
 386			if (!new_buffer) {
 387				acm->nb_index = 0;
 
 
 
 388				goto exit;
 389			}
 390
 391			acm->notification_buffer = new_buffer;
 392			acm->nb_size = alloc_size;
 393			dr = (struct usb_cdc_notification *)acm->notification_buffer;
 394		}
 395
 396		copy_size = min(current_size,
 397				expected_size - acm->nb_index);
 398
 399		memcpy(&acm->notification_buffer[acm->nb_index],
 400		       urb->transfer_buffer, copy_size);
 401		acm->nb_index += copy_size;
 402		current_size = acm->nb_index;
 403	}
 404
 405	if (current_size >= expected_size) {
 406		/* notification complete */
 407		acm_process_notification(acm, (unsigned char *)dr);
 408		acm->nb_index = 0;
 409	}
 410
 411exit:
 412	retval = usb_submit_urb(urb, GFP_ATOMIC);
 413	if (retval && retval != -EPERM && retval != -ENODEV)
 414		dev_err(&acm->control->dev,
 415			"%s - usb_submit_urb failed: %d\n", __func__, retval);
 416	else
 417		dev_vdbg(&acm->control->dev,
 418			"control resubmission terminated %d\n", retval);
 419}
 420
 421static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 422{
 423	int res;
 424
 425	if (!test_and_clear_bit(index, &acm->read_urbs_free))
 426		return 0;
 427
 428	res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 429	if (res) {
 430		if (res != -EPERM && res != -ENODEV) {
 431			dev_err(&acm->data->dev,
 432				"urb %d failed submission with %d\n",
 433				index, res);
 434		} else {
 435			dev_vdbg(&acm->data->dev, "intended failure %d\n", res);
 436		}
 437		set_bit(index, &acm->read_urbs_free);
 438		return res;
 439	} else {
 440		dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 441	}
 442
 443	return 0;
 444}
 445
 446static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 447{
 448	int res;
 449	int i;
 450
 451	for (i = 0; i < acm->rx_buflimit; ++i) {
 452		res = acm_submit_read_urb(acm, i, mem_flags);
 453		if (res)
 454			return res;
 455	}
 456
 457	return 0;
 458}
 459
 460static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 461{
 462	if (!urb->actual_length)
 463		return;
 464
 465	tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 466			urb->actual_length);
 467	tty_flip_buffer_push(&acm->port);
 468}
 469
 470static void acm_read_bulk_callback(struct urb *urb)
 471{
 472	struct acm_rb *rb = urb->context;
 473	struct acm *acm = rb->instance;
 474	int status = urb->status;
 475	bool stopped = false;
 476	bool stalled = false;
 477	bool cooldown = false;
 478
 479	dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 480		rb->index, urb->actual_length, status);
 481
 482	if (!acm->dev) {
 483		dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 484		return;
 485	}
 486
 487	switch (status) {
 488	case 0:
 489		usb_mark_last_busy(acm->dev);
 490		acm_process_read_urb(acm, urb);
 491		break;
 492	case -EPIPE:
 493		set_bit(EVENT_RX_STALL, &acm->flags);
 494		stalled = true;
 495		break;
 496	case -ENOENT:
 497	case -ECONNRESET:
 498	case -ESHUTDOWN:
 499		dev_dbg(&acm->data->dev,
 500			"%s - urb shutting down with status: %d\n",
 501			__func__, status);
 502		stopped = true;
 503		break;
 504	case -EOVERFLOW:
 505	case -EPROTO:
 506		dev_dbg(&acm->data->dev,
 507			"%s - cooling babbling device\n", __func__);
 508		usb_mark_last_busy(acm->dev);
 509		set_bit(rb->index, &acm->urbs_in_error_delay);
 510		cooldown = true;
 511		break;
 512	default:
 513		dev_dbg(&acm->data->dev,
 514			"%s - nonzero urb status received: %d\n",
 515			__func__, status);
 516		break;
 517	}
 518
 519	/*
 520	 * Make sure URB processing is done before marking as free to avoid
 521	 * racing with unthrottle() on another CPU. Matches the barriers
 522	 * implied by the test_and_clear_bit() in acm_submit_read_urb().
 523	 */
 524	smp_mb__before_atomic();
 525	set_bit(rb->index, &acm->read_urbs_free);
 526	/*
 527	 * Make sure URB is marked as free before checking the throttled flag
 528	 * to avoid racing with unthrottle() on another CPU. Matches the
 529	 * smp_mb() in unthrottle().
 530	 */
 531	smp_mb__after_atomic();
 532
 533	if (stopped || stalled || cooldown) {
 534		if (stalled)
 535			schedule_work(&acm->work);
 536		else if (cooldown)
 537			schedule_delayed_work(&acm->dwork, HZ / 2);
 538		return;
 539	}
 540
 541	if (test_bit(ACM_THROTTLED, &acm->flags))
 542		return;
 543
 544	acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 545}
 546
 547/* data interface wrote those outgoing bytes */
 548static void acm_write_bulk(struct urb *urb)
 549{
 550	struct acm_wb *wb = urb->context;
 551	struct acm *acm = wb->instance;
 552	unsigned long flags;
 553	int status = urb->status;
 554
 555	if (status || (urb->actual_length != urb->transfer_buffer_length))
 556		dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
 557			urb->actual_length,
 558			urb->transfer_buffer_length,
 559			status);
 560
 561	spin_lock_irqsave(&acm->write_lock, flags);
 562	acm_write_done(acm, wb);
 563	spin_unlock_irqrestore(&acm->write_lock, flags);
 564	set_bit(EVENT_TTY_WAKEUP, &acm->flags);
 565	schedule_work(&acm->work);
 566}
 567
 568static void acm_softint(struct work_struct *work)
 569{
 570	int i;
 571	struct acm *acm = container_of(work, struct acm, work);
 572
 573	if (test_bit(EVENT_RX_STALL, &acm->flags)) {
 574		smp_mb(); /* against acm_suspend() */
 575		if (!acm->susp_count) {
 576			for (i = 0; i < acm->rx_buflimit; i++)
 577				usb_kill_urb(acm->read_urbs[i]);
 578			usb_clear_halt(acm->dev, acm->in);
 579			acm_submit_read_urbs(acm, GFP_KERNEL);
 580			clear_bit(EVENT_RX_STALL, &acm->flags);
 581		}
 582	}
 583
 584	if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
 585		for (i = 0; i < acm->rx_buflimit; i++)
 586			if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
 587					acm_submit_read_urb(acm, i, GFP_NOIO);
 588	}
 589
 590	if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
 591		tty_port_tty_wakeup(&acm->port);
 592}
 593
 594/*
 595 * TTY handlers
 596 */
 597
 598static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 599{
 600	struct acm *acm;
 601	int retval;
 602
 603	acm = acm_get_by_minor(tty->index);
 604	if (!acm)
 605		return -ENODEV;
 606
 607	retval = tty_standard_install(driver, tty);
 608	if (retval)
 609		goto error_init_termios;
 610
 611	/*
 612	 * Suppress initial echoing for some devices which might send data
 613	 * immediately after acm driver has been installed.
 614	 */
 615	if (acm->quirks & DISABLE_ECHO)
 616		tty->termios.c_lflag &= ~ECHO;
 617
 618	tty->driver_data = acm;
 619
 620	return 0;
 621
 622error_init_termios:
 623	tty_port_put(&acm->port);
 624	return retval;
 625}
 626
 627static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 628{
 629	struct acm *acm = tty->driver_data;
 630
 631	return tty_port_open(&acm->port, tty, filp);
 632}
 633
 634static void acm_port_dtr_rts(struct tty_port *port, int raise)
 635{
 636	struct acm *acm = container_of(port, struct acm, port);
 637	int val;
 638	int res;
 639
 640	if (raise)
 641		val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 642	else
 643		val = 0;
 644
 645	/* FIXME: add missing ctrlout locking throughout driver */
 646	acm->ctrlout = val;
 647
 648	res = acm_set_control(acm, val);
 649	if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 650		dev_err(&acm->control->dev, "failed to set dtr/rts\n");
 651}
 652
 653static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 654{
 655	struct acm *acm = container_of(port, struct acm, port);
 656	int retval = -ENODEV;
 657	int i;
 658
 659	mutex_lock(&acm->mutex);
 660	if (acm->disconnected)
 661		goto disconnected;
 662
 663	retval = usb_autopm_get_interface(acm->control);
 664	if (retval)
 665		goto error_get_interface;
 666
 667	/*
 668	 * FIXME: Why do we need this? Allocating 64K of physically contiguous
 669	 * memory is really nasty...
 670	 */
 671	set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 672	acm->control->needs_remote_wakeup = 1;
 673
 674	acm->ctrlurb->dev = acm->dev;
 675	retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 676	if (retval) {
 677		dev_err(&acm->control->dev,
 678			"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 679		goto error_submit_urb;
 680	}
 681
 682	acm_tty_set_termios(tty, NULL);
 683
 684	/*
 685	 * Unthrottle device in case the TTY was closed while throttled.
 686	 */
 687	clear_bit(ACM_THROTTLED, &acm->flags);
 688
 689	retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 690	if (retval)
 691		goto error_submit_read_urbs;
 692
 693	usb_autopm_put_interface(acm->control);
 694
 695	mutex_unlock(&acm->mutex);
 696
 697	return 0;
 698
 699error_submit_read_urbs:
 700	for (i = 0; i < acm->rx_buflimit; i++)
 701		usb_kill_urb(acm->read_urbs[i]);
 702	usb_kill_urb(acm->ctrlurb);
 703error_submit_urb:
 704	usb_autopm_put_interface(acm->control);
 705error_get_interface:
 706disconnected:
 707	mutex_unlock(&acm->mutex);
 708
 709	return usb_translate_errors(retval);
 710}
 711
 712static void acm_port_destruct(struct tty_port *port)
 713{
 714	struct acm *acm = container_of(port, struct acm, port);
 715
 716	acm_release_minor(acm);
 717	usb_put_intf(acm->control);
 718	kfree(acm->country_codes);
 719	kfree(acm);
 720}
 721
 722static void acm_port_shutdown(struct tty_port *port)
 723{
 724	struct acm *acm = container_of(port, struct acm, port);
 725	struct urb *urb;
 726	struct acm_wb *wb;
 727
 728	/*
 729	 * Need to grab write_lock to prevent race with resume, but no need to
 730	 * hold it due to the tty-port initialised flag.
 731	 */
 732	spin_lock_irq(&acm->write_lock);
 733	spin_unlock_irq(&acm->write_lock);
 734
 735	usb_autopm_get_interface_no_resume(acm->control);
 736	acm->control->needs_remote_wakeup = 0;
 737	usb_autopm_put_interface(acm->control);
 738
 739	for (;;) {
 740		urb = usb_get_from_anchor(&acm->delayed);
 741		if (!urb)
 742			break;
 743		wb = urb->context;
 744		wb->use = 0;
 745		usb_autopm_put_interface_async(acm->control);
 746	}
 747
 748	acm_kill_urbs(acm);
 749}
 750
 751static void acm_tty_cleanup(struct tty_struct *tty)
 752{
 753	struct acm *acm = tty->driver_data;
 754
 755	tty_port_put(&acm->port);
 756}
 757
 758static void acm_tty_hangup(struct tty_struct *tty)
 759{
 760	struct acm *acm = tty->driver_data;
 761
 762	tty_port_hangup(&acm->port);
 763}
 764
 765static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 766{
 767	struct acm *acm = tty->driver_data;
 768
 769	tty_port_close(&acm->port, tty, filp);
 770}
 771
 772static int acm_tty_write(struct tty_struct *tty,
 773					const unsigned char *buf, int count)
 774{
 775	struct acm *acm = tty->driver_data;
 776	int stat;
 777	unsigned long flags;
 778	int wbn;
 779	struct acm_wb *wb;
 780
 781	if (!count)
 782		return 0;
 783
 784	dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
 785
 786	spin_lock_irqsave(&acm->write_lock, flags);
 787	wbn = acm_wb_alloc(acm);
 788	if (wbn < 0) {
 789		spin_unlock_irqrestore(&acm->write_lock, flags);
 790		return 0;
 791	}
 792	wb = &acm->wb[wbn];
 793
 794	if (!acm->dev) {
 795		wb->use = 0;
 796		spin_unlock_irqrestore(&acm->write_lock, flags);
 797		return -ENODEV;
 798	}
 799
 800	count = (count > acm->writesize) ? acm->writesize : count;
 801	dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
 802	memcpy(wb->buf, buf, count);
 803	wb->len = count;
 804
 805	stat = usb_autopm_get_interface_async(acm->control);
 806	if (stat) {
 807		wb->use = 0;
 808		spin_unlock_irqrestore(&acm->write_lock, flags);
 809		return stat;
 810	}
 811
 812	if (acm->susp_count) {
 813		usb_anchor_urb(wb->urb, &acm->delayed);
 814		spin_unlock_irqrestore(&acm->write_lock, flags);
 815		return count;
 816	}
 817
 818	stat = acm_start_wb(acm, wb);
 819	spin_unlock_irqrestore(&acm->write_lock, flags);
 820
 821	if (stat < 0)
 822		return stat;
 823	return count;
 824}
 825
 826static int acm_tty_write_room(struct tty_struct *tty)
 827{
 828	struct acm *acm = tty->driver_data;
 829	/*
 830	 * Do not let the line discipline to know that we have a reserve,
 831	 * or it might get too enthusiastic.
 832	 */
 833	return acm_wb_is_avail(acm) ? acm->writesize : 0;
 834}
 835
 836static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 837{
 838	struct acm *acm = tty->driver_data;
 839	/*
 840	 * if the device was unplugged then any remaining characters fell out
 841	 * of the connector ;)
 842	 */
 843	if (acm->disconnected)
 844		return 0;
 845	/*
 846	 * This is inaccurate (overcounts), but it works.
 847	 */
 848	return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 849}
 850
 851static void acm_tty_throttle(struct tty_struct *tty)
 852{
 853	struct acm *acm = tty->driver_data;
 854
 855	set_bit(ACM_THROTTLED, &acm->flags);
 856}
 857
 858static void acm_tty_unthrottle(struct tty_struct *tty)
 859{
 860	struct acm *acm = tty->driver_data;
 861
 862	clear_bit(ACM_THROTTLED, &acm->flags);
 863
 864	/* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
 865	smp_mb();
 866
 867	acm_submit_read_urbs(acm, GFP_KERNEL);
 868}
 869
 870static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 871{
 872	struct acm *acm = tty->driver_data;
 873	int retval;
 874
 875	retval = acm_send_break(acm, state ? 0xffff : 0);
 876	if (retval < 0)
 877		dev_dbg(&acm->control->dev,
 878			"%s - send break failed\n", __func__);
 879	return retval;
 880}
 881
 882static int acm_tty_tiocmget(struct tty_struct *tty)
 883{
 884	struct acm *acm = tty->driver_data;
 885
 886	return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 887	       (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 888	       (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 889	       (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 890	       (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 891	       TIOCM_CTS;
 892}
 893
 894static int acm_tty_tiocmset(struct tty_struct *tty,
 895			    unsigned int set, unsigned int clear)
 896{
 897	struct acm *acm = tty->driver_data;
 898	unsigned int newctrl;
 899
 900	newctrl = acm->ctrlout;
 901	set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 902					(set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 903	clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 904					(clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 905
 906	newctrl = (newctrl & ~clear) | set;
 907
 908	if (acm->ctrlout == newctrl)
 909		return 0;
 910	return acm_set_control(acm, acm->ctrlout = newctrl);
 911}
 912
 913static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 914{
 915	struct acm *acm = tty->driver_data;
 916
 917	ss->xmit_fifo_size = acm->writesize;
 918	ss->baud_base = le32_to_cpu(acm->line.dwDTERate);
 919	ss->close_delay	= jiffies_to_msecs(acm->port.close_delay) / 10;
 920	ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 921				ASYNC_CLOSING_WAIT_NONE :
 922				jiffies_to_msecs(acm->port.closing_wait) / 10;
 923	return 0;
 924}
 925
 926static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 927{
 928	struct acm *acm = tty->driver_data;
 929	unsigned int closing_wait, close_delay;
 930	unsigned int old_closing_wait, old_close_delay;
 931	int retval = 0;
 932
 933	close_delay = msecs_to_jiffies(ss->close_delay * 10);
 934	closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 935			ASYNC_CLOSING_WAIT_NONE :
 936			msecs_to_jiffies(ss->closing_wait * 10);
 937
 938	/* we must redo the rounding here, so that the values match */
 939	old_close_delay	= jiffies_to_msecs(acm->port.close_delay) / 10;
 940	old_closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 941				ASYNC_CLOSING_WAIT_NONE :
 942				jiffies_to_msecs(acm->port.closing_wait) / 10;
 943
 944	mutex_lock(&acm->port.mutex);
 945
 946	if (!capable(CAP_SYS_ADMIN)) {
 947		if ((ss->close_delay != old_close_delay) ||
 948		    (ss->closing_wait != old_closing_wait))
 949			retval = -EPERM;
 950		else
 951			retval = -EOPNOTSUPP;
 952	} else {
 953		acm->port.close_delay  = close_delay;
 954		acm->port.closing_wait = closing_wait;
 955	}
 956
 957	mutex_unlock(&acm->port.mutex);
 958	return retval;
 959}
 960
 961static int wait_serial_change(struct acm *acm, unsigned long arg)
 962{
 963	int rv = 0;
 964	DECLARE_WAITQUEUE(wait, current);
 965	struct async_icount old, new;
 966
 967	do {
 968		spin_lock_irq(&acm->read_lock);
 969		old = acm->oldcount;
 970		new = acm->iocount;
 971		acm->oldcount = new;
 972		spin_unlock_irq(&acm->read_lock);
 973
 974		if ((arg & TIOCM_DSR) &&
 975			old.dsr != new.dsr)
 976			break;
 977		if ((arg & TIOCM_CD)  &&
 978			old.dcd != new.dcd)
 979			break;
 980		if ((arg & TIOCM_RI) &&
 981			old.rng != new.rng)
 982			break;
 983
 984		add_wait_queue(&acm->wioctl, &wait);
 985		set_current_state(TASK_INTERRUPTIBLE);
 986		schedule();
 987		remove_wait_queue(&acm->wioctl, &wait);
 988		if (acm->disconnected) {
 989			if (arg & TIOCM_CD)
 990				break;
 991			else
 992				rv = -ENODEV;
 993		} else {
 994			if (signal_pending(current))
 995				rv = -ERESTARTSYS;
 996		}
 997	} while (!rv);
 998
 999	
1000
1001	return rv;
1002}
1003
1004static int acm_tty_get_icount(struct tty_struct *tty,
1005					struct serial_icounter_struct *icount)
1006{
1007	struct acm *acm = tty->driver_data;
1008
1009	icount->dsr = acm->iocount.dsr;
1010	icount->rng = acm->iocount.rng;
1011	icount->dcd = acm->iocount.dcd;
1012	icount->frame = acm->iocount.frame;
1013	icount->overrun = acm->iocount.overrun;
1014	icount->parity = acm->iocount.parity;
1015	icount->brk = acm->iocount.brk;
1016
1017	return 0;
1018}
1019
1020static int acm_tty_ioctl(struct tty_struct *tty,
1021					unsigned int cmd, unsigned long arg)
1022{
1023	struct acm *acm = tty->driver_data;
1024	int rv = -ENOIOCTLCMD;
1025
1026	switch (cmd) {
1027	case TIOCMIWAIT:
1028		rv = usb_autopm_get_interface(acm->control);
1029		if (rv < 0) {
1030			rv = -EIO;
1031			break;
1032		}
1033		rv = wait_serial_change(acm, arg);
1034		usb_autopm_put_interface(acm->control);
1035		break;
1036	}
1037
1038	return rv;
1039}
1040
1041static void acm_tty_set_termios(struct tty_struct *tty,
1042						struct ktermios *termios_old)
1043{
1044	struct acm *acm = tty->driver_data;
1045	struct ktermios *termios = &tty->termios;
1046	struct usb_cdc_line_coding newline;
1047	int newctrl = acm->ctrlout;
1048
1049	newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1050	newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1051	newline.bParityType = termios->c_cflag & PARENB ?
1052				(termios->c_cflag & PARODD ? 1 : 2) +
1053				(termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1054	switch (termios->c_cflag & CSIZE) {
1055	case CS5:
1056		newline.bDataBits = 5;
1057		break;
1058	case CS6:
1059		newline.bDataBits = 6;
1060		break;
1061	case CS7:
1062		newline.bDataBits = 7;
1063		break;
1064	case CS8:
1065	default:
1066		newline.bDataBits = 8;
1067		break;
1068	}
1069	/* FIXME: Needs to clear unsupported bits in the termios */
1070	acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1071
1072	if (C_BAUD(tty) == B0) {
1073		newline.dwDTERate = acm->line.dwDTERate;
1074		newctrl &= ~ACM_CTRL_DTR;
1075	} else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1076		newctrl |=  ACM_CTRL_DTR;
1077	}
1078
1079	if (newctrl != acm->ctrlout)
1080		acm_set_control(acm, acm->ctrlout = newctrl);
1081
1082	if (memcmp(&acm->line, &newline, sizeof newline)) {
1083		memcpy(&acm->line, &newline, sizeof newline);
1084		dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1085			__func__,
1086			le32_to_cpu(newline.dwDTERate),
1087			newline.bCharFormat, newline.bParityType,
1088			newline.bDataBits);
1089		acm_set_line(acm, &acm->line);
1090	}
1091}
1092
1093static const struct tty_port_operations acm_port_ops = {
1094	.dtr_rts = acm_port_dtr_rts,
1095	.shutdown = acm_port_shutdown,
1096	.activate = acm_port_activate,
1097	.destruct = acm_port_destruct,
1098};
1099
1100/*
1101 * USB probe and disconnect routines.
1102 */
1103
1104/* Little helpers: write/read buffers free */
1105static void acm_write_buffers_free(struct acm *acm)
1106{
1107	int i;
1108	struct acm_wb *wb;
1109
1110	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1111		usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1112}
1113
1114static void acm_read_buffers_free(struct acm *acm)
1115{
1116	int i;
1117
1118	for (i = 0; i < acm->rx_buflimit; i++)
1119		usb_free_coherent(acm->dev, acm->readsize,
1120			  acm->read_buffers[i].base, acm->read_buffers[i].dma);
1121}
1122
1123/* Little helper: write buffers allocate */
1124static int acm_write_buffers_alloc(struct acm *acm)
1125{
1126	int i;
1127	struct acm_wb *wb;
1128
1129	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1130		wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1131		    &wb->dmah);
1132		if (!wb->buf) {
1133			while (i != 0) {
1134				--i;
1135				--wb;
1136				usb_free_coherent(acm->dev, acm->writesize,
1137				    wb->buf, wb->dmah);
1138			}
1139			return -ENOMEM;
1140		}
1141	}
1142	return 0;
1143}
1144
1145static int acm_probe(struct usb_interface *intf,
1146		     const struct usb_device_id *id)
1147{
1148	struct usb_cdc_union_desc *union_header = NULL;
1149	struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1150	unsigned char *buffer = intf->altsetting->extra;
1151	int buflen = intf->altsetting->extralen;
1152	struct usb_interface *control_interface;
1153	struct usb_interface *data_interface;
1154	struct usb_endpoint_descriptor *epctrl = NULL;
1155	struct usb_endpoint_descriptor *epread = NULL;
1156	struct usb_endpoint_descriptor *epwrite = NULL;
1157	struct usb_device *usb_dev = interface_to_usbdev(intf);
1158	struct usb_cdc_parsed_header h;
1159	struct acm *acm;
1160	int minor;
1161	int ctrlsize, readsize;
1162	u8 *buf;
1163	int call_intf_num = -1;
1164	int data_intf_num = -1;
1165	unsigned long quirks;
1166	int num_rx_buf;
1167	int i;
1168	int combined_interfaces = 0;
1169	struct device *tty_dev;
1170	int rv = -ENOMEM;
1171	int res;
1172
1173	/* normal quirks */
1174	quirks = (unsigned long)id->driver_info;
1175
1176	if (quirks == IGNORE_DEVICE)
1177		return -ENODEV;
1178
1179	memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1180
1181	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1182
1183	/* handle quirks deadly to normal probing*/
1184	if (quirks == NO_UNION_NORMAL) {
1185		data_interface = usb_ifnum_to_if(usb_dev, 1);
1186		control_interface = usb_ifnum_to_if(usb_dev, 0);
1187		/* we would crash */
1188		if (!data_interface || !control_interface)
1189			return -ENODEV;
1190		goto skip_normal_probe;
1191	}
1192
1193	/* normal probing*/
1194	if (!buffer) {
1195		dev_err(&intf->dev, "Weird descriptor references\n");
1196		return -EINVAL;
1197	}
1198
1199	if (!intf->cur_altsetting)
1200		return -EINVAL;
1201
1202	if (!buflen) {
1203		if (intf->cur_altsetting->endpoint &&
1204				intf->cur_altsetting->endpoint->extralen &&
1205				intf->cur_altsetting->endpoint->extra) {
1206			dev_dbg(&intf->dev,
1207				"Seeking extra descriptors on endpoint\n");
1208			buflen = intf->cur_altsetting->endpoint->extralen;
1209			buffer = intf->cur_altsetting->endpoint->extra;
1210		} else {
1211			dev_err(&intf->dev,
1212				"Zero length descriptor references\n");
1213			return -EINVAL;
1214		}
1215	}
1216
1217	cdc_parse_cdc_header(&h, intf, buffer, buflen);
1218	union_header = h.usb_cdc_union_desc;
1219	cmgmd = h.usb_cdc_call_mgmt_descriptor;
1220	if (cmgmd)
1221		call_intf_num = cmgmd->bDataInterface;
1222
1223	if (!union_header) {
1224		if (call_intf_num > 0) {
1225			dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1226			/* quirks for Droids MuIn LCD */
1227			if (quirks & NO_DATA_INTERFACE) {
1228				data_interface = usb_ifnum_to_if(usb_dev, 0);
1229			} else {
1230				data_intf_num = call_intf_num;
1231				data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1232			}
1233			control_interface = intf;
1234		} else {
1235			if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1236				dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1237				return -ENODEV;
1238			} else {
1239				dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1240				combined_interfaces = 1;
1241				control_interface = data_interface = intf;
1242				goto look_for_collapsed_interface;
1243			}
1244		}
1245	} else {
1246		data_intf_num = union_header->bSlaveInterface0;
1247		control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1248		data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1249	}
1250
1251	if (!control_interface || !data_interface) {
1252		dev_dbg(&intf->dev, "no interfaces\n");
1253		return -ENODEV;
1254	}
1255	if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1256		return -ENODEV;
1257
1258	if (data_intf_num != call_intf_num)
1259		dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1260
1261	if (control_interface == data_interface) {
1262		/* some broken devices designed for windows work this way */
1263		dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1264		combined_interfaces = 1;
1265		/* a popular other OS doesn't use it */
1266		quirks |= NO_CAP_LINE;
1267		if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1268			dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1269			return -EINVAL;
1270		}
1271look_for_collapsed_interface:
1272		res = usb_find_common_endpoints(data_interface->cur_altsetting,
1273				&epread, &epwrite, &epctrl, NULL);
1274		if (res)
1275			return res;
1276
1277		goto made_compressed_probe;
1278	}
1279
1280skip_normal_probe:
1281
1282	/*workaround for switched interfaces */
1283	if (data_interface->cur_altsetting->desc.bInterfaceClass
1284						!= CDC_DATA_INTERFACE_TYPE) {
1285		if (control_interface->cur_altsetting->desc.bInterfaceClass
1286						== CDC_DATA_INTERFACE_TYPE) {
1287			dev_dbg(&intf->dev,
1288				"Your device has switched interfaces.\n");
1289			swap(control_interface, data_interface);
1290		} else {
1291			return -EINVAL;
1292		}
1293	}
1294
1295	/* Accept probe requests only for the control interface */
1296	if (!combined_interfaces && intf != control_interface)
1297		return -ENODEV;
1298
1299	if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1300		/* valid in this context */
1301		dev_dbg(&intf->dev, "The data interface isn't available\n");
1302		return -EBUSY;
1303	}
1304
1305
1306	if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1307	    control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1308		return -EINVAL;
1309
1310	epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1311	epread = &data_interface->cur_altsetting->endpoint[0].desc;
1312	epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1313
1314
1315	/* workaround for switched endpoints */
1316	if (!usb_endpoint_dir_in(epread)) {
1317		/* descriptors are swapped */
1318		dev_dbg(&intf->dev,
1319			"The data interface has switched endpoints\n");
1320		swap(epread, epwrite);
1321	}
1322made_compressed_probe:
1323	dev_dbg(&intf->dev, "interfaces are valid\n");
1324
1325	acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1326	if (acm == NULL)
1327		goto alloc_fail;
1328
1329	tty_port_init(&acm->port);
1330	acm->port.ops = &acm_port_ops;
1331
1332	ctrlsize = usb_endpoint_maxp(epctrl);
1333	readsize = usb_endpoint_maxp(epread) *
1334				(quirks == SINGLE_RX_URB ? 1 : 2);
1335	acm->combined_interfaces = combined_interfaces;
1336	acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1337	acm->control = control_interface;
1338	acm->data = data_interface;
1339
1340	usb_get_intf(acm->control); /* undone in destruct() */
1341
1342	minor = acm_alloc_minor(acm);
1343	if (minor < 0)
1344		goto alloc_fail1;
1345
1346	acm->minor = minor;
1347	acm->dev = usb_dev;
1348	if (h.usb_cdc_acm_descriptor)
1349		acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1350	if (quirks & NO_CAP_LINE)
1351		acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1352	acm->ctrlsize = ctrlsize;
1353	acm->readsize = readsize;
1354	acm->rx_buflimit = num_rx_buf;
1355	INIT_WORK(&acm->work, acm_softint);
1356	INIT_DELAYED_WORK(&acm->dwork, acm_softint);
1357	init_waitqueue_head(&acm->wioctl);
1358	spin_lock_init(&acm->write_lock);
1359	spin_lock_init(&acm->read_lock);
1360	mutex_init(&acm->mutex);
1361	if (usb_endpoint_xfer_int(epread)) {
1362		acm->bInterval = epread->bInterval;
1363		acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1364	} else {
1365		acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1366	}
1367	if (usb_endpoint_xfer_int(epwrite))
1368		acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1369	else
1370		acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1371	init_usb_anchor(&acm->delayed);
1372	acm->quirks = quirks;
1373
1374	buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1375	if (!buf)
1376		goto alloc_fail1;
1377	acm->ctrl_buffer = buf;
1378
1379	if (acm_write_buffers_alloc(acm) < 0)
1380		goto alloc_fail2;
1381
1382	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1383	if (!acm->ctrlurb)
1384		goto alloc_fail3;
1385
1386	for (i = 0; i < num_rx_buf; i++) {
1387		struct acm_rb *rb = &(acm->read_buffers[i]);
1388		struct urb *urb;
1389
1390		rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1391								&rb->dma);
1392		if (!rb->base)
1393			goto alloc_fail4;
1394		rb->index = i;
1395		rb->instance = acm;
1396
1397		urb = usb_alloc_urb(0, GFP_KERNEL);
1398		if (!urb)
1399			goto alloc_fail4;
1400
1401		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1402		urb->transfer_dma = rb->dma;
1403		if (usb_endpoint_xfer_int(epread))
1404			usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1405					 acm->readsize,
1406					 acm_read_bulk_callback, rb,
1407					 acm->bInterval);
1408		else
1409			usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1410					  acm->readsize,
1411					  acm_read_bulk_callback, rb);
1412
1413		acm->read_urbs[i] = urb;
1414		__set_bit(i, &acm->read_urbs_free);
1415	}
1416	for (i = 0; i < ACM_NW; i++) {
1417		struct acm_wb *snd = &(acm->wb[i]);
1418
1419		snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1420		if (snd->urb == NULL)
1421			goto alloc_fail5;
1422
1423		if (usb_endpoint_xfer_int(epwrite))
1424			usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1425				NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1426		else
1427			usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1428				NULL, acm->writesize, acm_write_bulk, snd);
1429		snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1430		if (quirks & SEND_ZERO_PACKET)
1431			snd->urb->transfer_flags |= URB_ZERO_PACKET;
1432		snd->instance = acm;
1433	}
1434
1435	usb_set_intfdata(intf, acm);
1436
1437	i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1438	if (i < 0)
1439		goto alloc_fail5;
1440
1441	if (h.usb_cdc_country_functional_desc) { /* export the country data */
1442		struct usb_cdc_country_functional_desc * cfd =
1443					h.usb_cdc_country_functional_desc;
1444
1445		acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1446		if (!acm->country_codes)
1447			goto skip_countries;
1448		acm->country_code_size = cfd->bLength - 4;
1449		memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1450							cfd->bLength - 4);
1451		acm->country_rel_date = cfd->iCountryCodeRelDate;
1452
1453		i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1454		if (i < 0) {
1455			kfree(acm->country_codes);
1456			acm->country_codes = NULL;
1457			acm->country_code_size = 0;
1458			goto skip_countries;
1459		}
1460
1461		i = device_create_file(&intf->dev,
1462						&dev_attr_iCountryCodeRelDate);
1463		if (i < 0) {
1464			device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1465			kfree(acm->country_codes);
1466			acm->country_codes = NULL;
1467			acm->country_code_size = 0;
1468			goto skip_countries;
1469		}
1470	}
1471
1472skip_countries:
1473	usb_fill_int_urb(acm->ctrlurb, usb_dev,
1474			 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1475			 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1476			 /* works around buggy devices */
1477			 epctrl->bInterval ? epctrl->bInterval : 16);
1478	acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1479	acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1480	acm->notification_buffer = NULL;
1481	acm->nb_index = 0;
1482	acm->nb_size = 0;
1483
1484	dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1485
1486	acm->line.dwDTERate = cpu_to_le32(9600);
1487	acm->line.bDataBits = 8;
1488	acm_set_line(acm, &acm->line);
1489
1490	usb_driver_claim_interface(&acm_driver, data_interface, acm);
1491	usb_set_intfdata(data_interface, acm);
1492
1493	tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1494			&control_interface->dev);
1495	if (IS_ERR(tty_dev)) {
1496		rv = PTR_ERR(tty_dev);
1497		goto alloc_fail6;
1498	}
1499
1500	if (quirks & CLEAR_HALT_CONDITIONS) {
1501		usb_clear_halt(usb_dev, acm->in);
1502		usb_clear_halt(usb_dev, acm->out);
1503	}
1504
1505	return 0;
1506alloc_fail6:
1507	if (acm->country_codes) {
1508		device_remove_file(&acm->control->dev,
1509				&dev_attr_wCountryCodes);
1510		device_remove_file(&acm->control->dev,
1511				&dev_attr_iCountryCodeRelDate);
1512		kfree(acm->country_codes);
1513	}
1514	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1515alloc_fail5:
1516	usb_set_intfdata(intf, NULL);
1517	for (i = 0; i < ACM_NW; i++)
1518		usb_free_urb(acm->wb[i].urb);
1519alloc_fail4:
1520	for (i = 0; i < num_rx_buf; i++)
1521		usb_free_urb(acm->read_urbs[i]);
1522	acm_read_buffers_free(acm);
1523	usb_free_urb(acm->ctrlurb);
1524alloc_fail3:
1525	acm_write_buffers_free(acm);
1526alloc_fail2:
1527	usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1528alloc_fail1:
1529	tty_port_put(&acm->port);
1530alloc_fail:
1531	return rv;
1532}
1533
1534static void acm_disconnect(struct usb_interface *intf)
1535{
1536	struct acm *acm = usb_get_intfdata(intf);
1537	struct tty_struct *tty;
1538	int i;
1539
1540	/* sibling interface is already cleaning up */
1541	if (!acm)
1542		return;
1543
1544	mutex_lock(&acm->mutex);
1545	acm->disconnected = true;
1546	if (acm->country_codes) {
1547		device_remove_file(&acm->control->dev,
1548				&dev_attr_wCountryCodes);
1549		device_remove_file(&acm->control->dev,
1550				&dev_attr_iCountryCodeRelDate);
1551	}
1552	wake_up_all(&acm->wioctl);
1553	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1554	usb_set_intfdata(acm->control, NULL);
1555	usb_set_intfdata(acm->data, NULL);
1556	mutex_unlock(&acm->mutex);
1557
1558	tty = tty_port_tty_get(&acm->port);
1559	if (tty) {
1560		tty_vhangup(tty);
1561		tty_kref_put(tty);
1562	}
1563
1564	acm_kill_urbs(acm);
1565	cancel_work_sync(&acm->work);
1566	cancel_delayed_work_sync(&acm->dwork);
1567
1568	tty_unregister_device(acm_tty_driver, acm->minor);
1569
1570	usb_free_urb(acm->ctrlurb);
1571	for (i = 0; i < ACM_NW; i++)
1572		usb_free_urb(acm->wb[i].urb);
1573	for (i = 0; i < acm->rx_buflimit; i++)
1574		usb_free_urb(acm->read_urbs[i]);
1575	acm_write_buffers_free(acm);
1576	usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1577	acm_read_buffers_free(acm);
1578
1579	kfree(acm->notification_buffer);
1580
1581	if (!acm->combined_interfaces)
1582		usb_driver_release_interface(&acm_driver, intf == acm->control ?
1583					acm->data : acm->control);
1584
1585	tty_port_put(&acm->port);
1586}
1587
1588#ifdef CONFIG_PM
1589static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1590{
1591	struct acm *acm = usb_get_intfdata(intf);
1592	int cnt;
1593
1594	spin_lock_irq(&acm->write_lock);
1595	if (PMSG_IS_AUTO(message)) {
1596		if (acm->transmitting) {
1597			spin_unlock_irq(&acm->write_lock);
1598			return -EBUSY;
1599		}
1600	}
1601	cnt = acm->susp_count++;
1602	spin_unlock_irq(&acm->write_lock);
1603
1604	if (cnt)
1605		return 0;
1606
1607	acm_kill_urbs(acm);
1608	cancel_work_sync(&acm->work);
1609	cancel_delayed_work_sync(&acm->dwork);
1610	acm->urbs_in_error_delay = 0;
1611
1612	return 0;
1613}
1614
1615static int acm_resume(struct usb_interface *intf)
1616{
1617	struct acm *acm = usb_get_intfdata(intf);
1618	struct urb *urb;
1619	int rv = 0;
1620
1621	spin_lock_irq(&acm->write_lock);
1622
1623	if (--acm->susp_count)
1624		goto out;
1625
1626	if (tty_port_initialized(&acm->port)) {
1627		rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1628
1629		for (;;) {
1630			urb = usb_get_from_anchor(&acm->delayed);
1631			if (!urb)
1632				break;
1633
1634			acm_start_wb(acm, urb->context);
1635		}
1636
1637		/*
1638		 * delayed error checking because we must
1639		 * do the write path at all cost
1640		 */
1641		if (rv < 0)
1642			goto out;
1643
1644		rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1645	}
1646out:
1647	spin_unlock_irq(&acm->write_lock);
1648
1649	return rv;
1650}
1651
1652static int acm_reset_resume(struct usb_interface *intf)
1653{
1654	struct acm *acm = usb_get_intfdata(intf);
1655
1656	if (tty_port_initialized(&acm->port))
1657		tty_port_tty_hangup(&acm->port, false);
1658
1659	return acm_resume(intf);
1660}
1661
1662#endif /* CONFIG_PM */
1663
1664static int acm_pre_reset(struct usb_interface *intf)
1665{
1666	struct acm *acm = usb_get_intfdata(intf);
1667
1668	clear_bit(EVENT_RX_STALL, &acm->flags);
1669	acm->nb_index = 0; /* pending control transfers are lost */
1670
1671	return 0;
1672}
1673
1674#define NOKIA_PCSUITE_ACM_INFO(x) \
1675		USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1676		USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1677		USB_CDC_ACM_PROTO_VENDOR)
1678
1679#define SAMSUNG_PCSUITE_ACM_INFO(x) \
1680		USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1681		USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1682		USB_CDC_ACM_PROTO_VENDOR)
1683
1684/*
1685 * USB driver structure.
1686 */
1687
1688static const struct usb_device_id acm_ids[] = {
1689	/* quirky and broken devices */
1690	{ USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1691	  .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
1692	{ USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1693	.driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1694	{ USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1695	.driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1696	{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1697	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1698	},
1699	{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1700	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1701	},
1702	{ USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1703	.driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1704	},
1705	{ USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1706	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1707	},
1708	{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1709	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1710	},
1711	{ USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1712	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1713	},
1714	{ USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1715	.driver_info = SINGLE_RX_URB,
1716	},
1717	{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1718	.driver_info = SINGLE_RX_URB, /* firmware bug */
1719	},
1720	{ USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1721	.driver_info = SINGLE_RX_URB, /* firmware bug */
1722	},
1723	{ USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1724	.driver_info = SINGLE_RX_URB,
1725	},
1726	{ USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1727	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1728	},
1729	{ USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1730	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1731	},
1732	{ USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1733	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1734	},
1735	{ USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1736	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1737	},
1738	{ USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1739	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1740	},
1741	{ USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1742	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1743	},
1744	{ USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1745	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1746	},
1747	{ USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1748	.driver_info = QUIRK_CONTROL_LINE_STATE, },
1749	{ USB_DEVICE(0x2184, 0x001c) },	/* GW Instek AFG-2225 */
1750	{ USB_DEVICE(0x2184, 0x0036) },	/* GW Instek AFG-125 */
1751	{ USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1752	},
1753	/* Motorola H24 HSPA module: */
1754	{ USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1755	{ USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1756	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1757	},
1758	{ USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1759	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1760	},
1761	{ USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1762	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1763	},
1764	{ USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1765	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1766	},
1767	{ USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1768	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1769	},
1770	{ USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1771	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1772	},
1773	{ USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1774	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1775	},
1776
1777	{ USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1778	.driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1779					   data interface instead of
1780					   communications interface.
1781					   Maybe we should define a new
1782					   quirk for this. */
1783	},
1784	{ USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1785	.driver_info = NO_UNION_NORMAL,
1786	},
1787	{ USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1788	.driver_info = NO_UNION_NORMAL,
1789	},
1790	{ USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1791	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1792	},
1793	{ USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1794	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1795	},
1796	{ USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1797	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1798	},
1799	{ USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1800	.driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1801	},
1802	{ USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1803	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1804	},
1805
1806	{ USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1807	.driver_info = CLEAR_HALT_CONDITIONS,
1808	},
1809
1810	/* Nokia S60 phones expose two ACM channels. The first is
1811	 * a modem and is picked up by the standard AT-command
1812	 * information below. The second is 'vendor-specific' but
1813	 * is treated as a serial device at the S60 end, so we want
1814	 * to expose it on Linux too. */
1815	{ NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1816	{ NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1817	{ NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1818	{ NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1819	{ NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1820	{ NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1821	{ NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1822	{ NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1823	{ NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1824	{ NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1825	{ NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1826	{ NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1827	{ NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1828	{ NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1829	{ NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1830	{ NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1831	{ NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1832	{ NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1833	{ NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1834	{ NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1835	{ NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1836	{ NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1837	{ NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1838	{ NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1839	{ NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1840	{ NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1841	{ NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1842	{ NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1843	{ NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1844	{ NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1845	{ NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1846	{ NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1847	{ NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1848	{ NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1849	{ NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1850	{ NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1851	{ NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1852	{ NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1853	{ NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1854	{ NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1855	{ NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1856	{ NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1857	{ NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1858	{ NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1859	{ NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1860	{ NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1861	{ NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1862	{ NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1863	{ NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1864	{ NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1865	{ NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1866	{ NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1867	{ NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1868	{ NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1869	{ NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1870	{ NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1871	{ NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1872	{ SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1873
1874	/* Support for Owen devices */
1875	{ USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1876
1877	/* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1878
1879	/* Support for Droids MuIn LCD */
1880	{ USB_DEVICE(0x04d8, 0x000b),
1881	.driver_info = NO_DATA_INTERFACE,
1882	},
1883
1884#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1885	{ USB_DEVICE(0x04d8, 0x0082),	/* Application mode */
1886	.driver_info = IGNORE_DEVICE,
1887	},
1888	{ USB_DEVICE(0x04d8, 0x0083),	/* Bootloader mode */
1889	.driver_info = IGNORE_DEVICE,
1890	},
1891#endif
1892
1893#if IS_ENABLED(CONFIG_IR_TOY)
1894	{ USB_DEVICE(0x04d8, 0xfd08),
1895	.driver_info = IGNORE_DEVICE,
1896	},
1897#endif
1898
1899	/*Samsung phone in firmware update mode */
1900	{ USB_DEVICE(0x04e8, 0x685d),
1901	.driver_info = IGNORE_DEVICE,
1902	},
1903
1904	/* Exclude Infineon Flash Loader utility */
1905	{ USB_DEVICE(0x058b, 0x0041),
1906	.driver_info = IGNORE_DEVICE,
1907	},
1908
1909	{ USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1910	.driver_info = SEND_ZERO_PACKET,
1911	},
1912	{ USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1913	.driver_info = SEND_ZERO_PACKET,
1914	},
1915
1916	/* control interfaces without any protocol set */
1917	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1918		USB_CDC_PROTO_NONE) },
1919
1920	/* control interfaces with various AT-command sets */
1921	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1922		USB_CDC_ACM_PROTO_AT_V25TER) },
1923	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1924		USB_CDC_ACM_PROTO_AT_PCCA101) },
1925	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1926		USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1927	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1928		USB_CDC_ACM_PROTO_AT_GSM) },
1929	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1930		USB_CDC_ACM_PROTO_AT_3G) },
1931	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1932		USB_CDC_ACM_PROTO_AT_CDMA) },
1933
1934	{ USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1935	.driver_info = SEND_ZERO_PACKET,
1936	},
1937
1938	{ }
1939};
1940
1941MODULE_DEVICE_TABLE(usb, acm_ids);
1942
1943static struct usb_driver acm_driver = {
1944	.name =		"cdc_acm",
1945	.probe =	acm_probe,
1946	.disconnect =	acm_disconnect,
1947#ifdef CONFIG_PM
1948	.suspend =	acm_suspend,
1949	.resume =	acm_resume,
1950	.reset_resume =	acm_reset_resume,
1951#endif
1952	.pre_reset =	acm_pre_reset,
1953	.id_table =	acm_ids,
1954#ifdef CONFIG_PM
1955	.supports_autosuspend = 1,
1956#endif
1957	.disable_hub_initiated_lpm = 1,
1958};
1959
1960/*
1961 * TTY driver structures.
1962 */
1963
1964static const struct tty_operations acm_ops = {
1965	.install =		acm_tty_install,
1966	.open =			acm_tty_open,
1967	.close =		acm_tty_close,
1968	.cleanup =		acm_tty_cleanup,
1969	.hangup =		acm_tty_hangup,
1970	.write =		acm_tty_write,
1971	.write_room =		acm_tty_write_room,
1972	.ioctl =		acm_tty_ioctl,
1973	.throttle =		acm_tty_throttle,
1974	.unthrottle =		acm_tty_unthrottle,
1975	.chars_in_buffer =	acm_tty_chars_in_buffer,
1976	.break_ctl =		acm_tty_break_ctl,
1977	.set_termios =		acm_tty_set_termios,
1978	.tiocmget =		acm_tty_tiocmget,
1979	.tiocmset =		acm_tty_tiocmset,
1980	.get_serial =		get_serial_info,
1981	.set_serial =		set_serial_info,
1982	.get_icount =		acm_tty_get_icount,
1983};
1984
1985/*
1986 * Init / exit.
1987 */
1988
1989static int __init acm_init(void)
1990{
1991	int retval;
1992	acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1993	if (!acm_tty_driver)
1994		return -ENOMEM;
1995	acm_tty_driver->driver_name = "acm",
1996	acm_tty_driver->name = "ttyACM",
1997	acm_tty_driver->major = ACM_TTY_MAJOR,
1998	acm_tty_driver->minor_start = 0,
1999	acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2000	acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2001	acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2002	acm_tty_driver->init_termios = tty_std_termios;
2003	acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2004								HUPCL | CLOCAL;
2005	tty_set_operations(acm_tty_driver, &acm_ops);
2006
2007	retval = tty_register_driver(acm_tty_driver);
2008	if (retval) {
2009		put_tty_driver(acm_tty_driver);
2010		return retval;
2011	}
2012
2013	retval = usb_register(&acm_driver);
2014	if (retval) {
2015		tty_unregister_driver(acm_tty_driver);
2016		put_tty_driver(acm_tty_driver);
2017		return retval;
2018	}
2019
2020	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2021
2022	return 0;
2023}
2024
2025static void __exit acm_exit(void)
2026{
2027	usb_deregister(&acm_driver);
2028	tty_unregister_driver(acm_tty_driver);
2029	put_tty_driver(acm_tty_driver);
2030	idr_destroy(&acm_minors);
2031}
2032
2033module_init(acm_init);
2034module_exit(acm_exit);
2035
2036MODULE_AUTHOR(DRIVER_AUTHOR);
2037MODULE_DESCRIPTION(DRIVER_DESC);
2038MODULE_LICENSE("GPL");
2039MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);