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				const 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, USB_CTRL_SET_TIMEOUT);
 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_poison_urbs(struct acm *acm)
 151{
 152	int i;
 153
 154	usb_poison_urb(acm->ctrlurb);
 155	for (i = 0; i < ACM_NW; i++)
 156		usb_poison_urb(acm->wb[i].urb);
 157	for (i = 0; i < acm->rx_buflimit; i++)
 158		usb_poison_urb(acm->read_urbs[i]);
 159}
 160
 161static void acm_unpoison_urbs(struct acm *acm)
 162{
 163	int i;
 164
 165	for (i = 0; i < acm->rx_buflimit; i++)
 166		usb_unpoison_urb(acm->read_urbs[i]);
 167	for (i = 0; i < ACM_NW; i++)
 168		usb_unpoison_urb(acm->wb[i].urb);
 169	usb_unpoison_urb(acm->ctrlurb);
 170}
 171
 172
 173/*
 174 * Write buffer management.
 175 * All of these assume proper locks taken by the caller.
 176 */
 177
 178static int acm_wb_alloc(struct acm *acm)
 179{
 180	int i, wbn;
 181	struct acm_wb *wb;
 182
 183	wbn = 0;
 184	i = 0;
 185	for (;;) {
 186		wb = &acm->wb[wbn];
 187		if (!wb->use) {
 188			wb->use = true;
 189			wb->len = 0;
 190			return wbn;
 191		}
 192		wbn = (wbn + 1) % ACM_NW;
 193		if (++i >= ACM_NW)
 194			return -1;
 195	}
 196}
 197
 198static int acm_wb_is_avail(struct acm *acm)
 199{
 200	int i, n;
 201	unsigned long flags;
 202
 203	n = ACM_NW;
 204	spin_lock_irqsave(&acm->write_lock, flags);
 205	for (i = 0; i < ACM_NW; i++)
 206		if(acm->wb[i].use)
 207			n--;
 208	spin_unlock_irqrestore(&acm->write_lock, flags);
 209	return n;
 210}
 211
 212/*
 213 * Finish write. Caller must hold acm->write_lock
 214 */
 215static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 216{
 217	wb->use = false;
 218	acm->transmitting--;
 219	usb_autopm_put_interface_async(acm->control);
 220}
 221
 222/*
 223 * Poke write.
 224 *
 225 * the caller is responsible for locking
 226 */
 227
 228static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 229{
 230	int rc;
 231
 232	acm->transmitting++;
 233
 234	wb->urb->transfer_buffer = wb->buf;
 235	wb->urb->transfer_dma = wb->dmah;
 236	wb->urb->transfer_buffer_length = wb->len;
 237	wb->urb->dev = acm->dev;
 238
 239	rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 240	if (rc < 0) {
 241		if (rc != -EPERM)
 242			dev_err(&acm->data->dev,
 243				"%s - usb_submit_urb(write bulk) failed: %d\n",
 244				__func__, rc);
 245		acm_write_done(acm, wb);
 246	}
 247	return rc;
 248}
 249
 250/*
 251 * attributes exported through sysfs
 252 */
 253static ssize_t bmCapabilities_show
 254(struct device *dev, struct device_attribute *attr, char *buf)
 255{
 256	struct usb_interface *intf = to_usb_interface(dev);
 257	struct acm *acm = usb_get_intfdata(intf);
 258
 259	return sprintf(buf, "%d", acm->ctrl_caps);
 260}
 261static DEVICE_ATTR_RO(bmCapabilities);
 262
 263static ssize_t wCountryCodes_show
 264(struct device *dev, struct device_attribute *attr, char *buf)
 265{
 266	struct usb_interface *intf = to_usb_interface(dev);
 267	struct acm *acm = usb_get_intfdata(intf);
 268
 269	memcpy(buf, acm->country_codes, acm->country_code_size);
 270	return acm->country_code_size;
 271}
 272
 273static DEVICE_ATTR_RO(wCountryCodes);
 274
 275static ssize_t iCountryCodeRelDate_show
 276(struct device *dev, struct device_attribute *attr, char *buf)
 277{
 278	struct usb_interface *intf = to_usb_interface(dev);
 279	struct acm *acm = usb_get_intfdata(intf);
 280
 281	return sprintf(buf, "%d", acm->country_rel_date);
 282}
 283
 284static DEVICE_ATTR_RO(iCountryCodeRelDate);
 285/*
 286 * Interrupt handlers for various ACM device responses
 287 */
 288
 289static void acm_process_notification(struct acm *acm, unsigned char *buf)
 290{
 291	int newctrl;
 292	int difference;
 293	unsigned long flags;
 294	struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
 295	unsigned char *data = buf + sizeof(struct usb_cdc_notification);
 296
 297	switch (dr->bNotificationType) {
 298	case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 299		dev_dbg(&acm->control->dev,
 300			"%s - network connection: %d\n", __func__, dr->wValue);
 301		break;
 302
 303	case USB_CDC_NOTIFY_SERIAL_STATE:
 304		if (le16_to_cpu(dr->wLength) != 2) {
 305			dev_dbg(&acm->control->dev,
 306				"%s - malformed serial state\n", __func__);
 307			break;
 308		}
 309
 310		newctrl = get_unaligned_le16(data);
 311		dev_dbg(&acm->control->dev,
 312			"%s - serial state: 0x%x\n", __func__, newctrl);
 313
 314		if (!acm->clocal && (acm->ctrlin & ~newctrl & USB_CDC_SERIAL_STATE_DCD)) {
 315			dev_dbg(&acm->control->dev,
 316				"%s - calling hangup\n", __func__);
 317			tty_port_tty_hangup(&acm->port, false);
 318		}
 319
 320		difference = acm->ctrlin ^ newctrl;
 321		spin_lock_irqsave(&acm->read_lock, flags);
 322		acm->ctrlin = newctrl;
 323		acm->oldcount = acm->iocount;
 324
 325		if (difference & USB_CDC_SERIAL_STATE_DSR)
 326			acm->iocount.dsr++;
 327		if (difference & USB_CDC_SERIAL_STATE_DCD)
 328			acm->iocount.dcd++;
 329		if (newctrl & USB_CDC_SERIAL_STATE_BREAK) {
 330			acm->iocount.brk++;
 331			tty_insert_flip_char(&acm->port, 0, TTY_BREAK);
 332		}
 333		if (newctrl & USB_CDC_SERIAL_STATE_RING_SIGNAL)
 334			acm->iocount.rng++;
 335		if (newctrl & USB_CDC_SERIAL_STATE_FRAMING)
 336			acm->iocount.frame++;
 337		if (newctrl & USB_CDC_SERIAL_STATE_PARITY)
 338			acm->iocount.parity++;
 339		if (newctrl & USB_CDC_SERIAL_STATE_OVERRUN)
 340			acm->iocount.overrun++;
 341		spin_unlock_irqrestore(&acm->read_lock, flags);
 342
 343		if (newctrl & USB_CDC_SERIAL_STATE_BREAK)
 344			tty_flip_buffer_push(&acm->port);
 345
 346		if (difference)
 347			wake_up_all(&acm->wioctl);
 348
 349		break;
 350
 351	default:
 352		dev_dbg(&acm->control->dev,
 353			"%s - unknown notification %d received: index %d len %d\n",
 354			__func__,
 355			dr->bNotificationType, dr->wIndex, dr->wLength);
 356	}
 357}
 358
 359/* control interface reports status changes with "interrupt" transfers */
 360static void acm_ctrl_irq(struct urb *urb)
 361{
 362	struct acm *acm = urb->context;
 363	struct usb_cdc_notification *dr = urb->transfer_buffer;
 364	unsigned int current_size = urb->actual_length;
 365	unsigned int expected_size, copy_size, alloc_size;
 366	int retval;
 367	int status = urb->status;
 368
 369	switch (status) {
 370	case 0:
 371		/* success */
 372		break;
 373	case -ECONNRESET:
 374	case -ENOENT:
 375	case -ESHUTDOWN:
 376		/* this urb is terminated, clean up */
 377		dev_dbg(&acm->control->dev,
 378			"%s - urb shutting down with status: %d\n",
 379			__func__, status);
 380		return;
 381	default:
 382		dev_dbg(&acm->control->dev,
 383			"%s - nonzero urb status received: %d\n",
 384			__func__, status);
 385		goto exit;
 386	}
 387
 388	usb_mark_last_busy(acm->dev);
 389
 390	if (acm->nb_index)
 391		dr = (struct usb_cdc_notification *)acm->notification_buffer;
 392
 393	/* size = notification-header + (optional) data */
 394	expected_size = sizeof(struct usb_cdc_notification) +
 395					le16_to_cpu(dr->wLength);
 396
 397	if (current_size < expected_size) {
 398		/* notification is transmitted fragmented, reassemble */
 399		if (acm->nb_size < expected_size) {
 400			u8 *new_buffer;
 
 
 
 401			alloc_size = roundup_pow_of_two(expected_size);
 402			/* Final freeing is done on disconnect. */
 403			new_buffer = krealloc(acm->notification_buffer,
 404					      alloc_size, GFP_ATOMIC);
 405			if (!new_buffer) {
 406				acm->nb_index = 0;
 
 
 
 407				goto exit;
 408			}
 409
 410			acm->notification_buffer = new_buffer;
 411			acm->nb_size = alloc_size;
 412			dr = (struct usb_cdc_notification *)acm->notification_buffer;
 413		}
 414
 415		copy_size = min(current_size,
 416				expected_size - acm->nb_index);
 417
 418		memcpy(&acm->notification_buffer[acm->nb_index],
 419		       urb->transfer_buffer, copy_size);
 420		acm->nb_index += copy_size;
 421		current_size = acm->nb_index;
 422	}
 423
 424	if (current_size >= expected_size) {
 425		/* notification complete */
 426		acm_process_notification(acm, (unsigned char *)dr);
 427		acm->nb_index = 0;
 428	}
 429
 430exit:
 431	retval = usb_submit_urb(urb, GFP_ATOMIC);
 432	if (retval && retval != -EPERM && retval != -ENODEV)
 433		dev_err(&acm->control->dev,
 434			"%s - usb_submit_urb failed: %d\n", __func__, retval);
 435	else
 436		dev_vdbg(&acm->control->dev,
 437			"control resubmission terminated %d\n", retval);
 438}
 439
 440static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 441{
 442	int res;
 443
 444	if (!test_and_clear_bit(index, &acm->read_urbs_free))
 445		return 0;
 446
 447	res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 448	if (res) {
 449		if (res != -EPERM && res != -ENODEV) {
 450			dev_err(&acm->data->dev,
 451				"urb %d failed submission with %d\n",
 452				index, res);
 453		} else {
 454			dev_vdbg(&acm->data->dev, "intended failure %d\n", res);
 455		}
 456		set_bit(index, &acm->read_urbs_free);
 457		return res;
 458	} else {
 459		dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 460	}
 461
 462	return 0;
 463}
 464
 465static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 466{
 467	int res;
 468	int i;
 469
 470	for (i = 0; i < acm->rx_buflimit; ++i) {
 471		res = acm_submit_read_urb(acm, i, mem_flags);
 472		if (res)
 473			return res;
 474	}
 475
 476	return 0;
 477}
 478
 479static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 480{
 481	unsigned long flags;
 482
 483	if (!urb->actual_length)
 484		return;
 485
 486	spin_lock_irqsave(&acm->read_lock, flags);
 487	tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 488			urb->actual_length);
 489	spin_unlock_irqrestore(&acm->read_lock, flags);
 490
 491	tty_flip_buffer_push(&acm->port);
 492}
 493
 494static void acm_read_bulk_callback(struct urb *urb)
 495{
 496	struct acm_rb *rb = urb->context;
 497	struct acm *acm = rb->instance;
 498	int status = urb->status;
 499	bool stopped = false;
 500	bool stalled = false;
 501	bool cooldown = false;
 502
 503	dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 504		rb->index, urb->actual_length, status);
 505
 
 
 
 
 
 506	switch (status) {
 507	case 0:
 508		usb_mark_last_busy(acm->dev);
 509		acm_process_read_urb(acm, urb);
 510		break;
 511	case -EPIPE:
 512		set_bit(EVENT_RX_STALL, &acm->flags);
 513		stalled = true;
 514		break;
 515	case -ENOENT:
 516	case -ECONNRESET:
 517	case -ESHUTDOWN:
 518		dev_dbg(&acm->data->dev,
 519			"%s - urb shutting down with status: %d\n",
 520			__func__, status);
 521		stopped = true;
 522		break;
 523	case -EOVERFLOW:
 524	case -EPROTO:
 525		dev_dbg(&acm->data->dev,
 526			"%s - cooling babbling device\n", __func__);
 527		usb_mark_last_busy(acm->dev);
 528		set_bit(rb->index, &acm->urbs_in_error_delay);
 529		set_bit(ACM_ERROR_DELAY, &acm->flags);
 530		cooldown = true;
 531		break;
 532	default:
 533		dev_dbg(&acm->data->dev,
 534			"%s - nonzero urb status received: %d\n",
 535			__func__, status);
 536		break;
 537	}
 538
 539	/*
 540	 * Make sure URB processing is done before marking as free to avoid
 541	 * racing with unthrottle() on another CPU. Matches the barriers
 542	 * implied by the test_and_clear_bit() in acm_submit_read_urb().
 543	 */
 544	smp_mb__before_atomic();
 545	set_bit(rb->index, &acm->read_urbs_free);
 546	/*
 547	 * Make sure URB is marked as free before checking the throttled flag
 548	 * to avoid racing with unthrottle() on another CPU. Matches the
 549	 * smp_mb() in unthrottle().
 550	 */
 551	smp_mb__after_atomic();
 552
 553	if (stopped || stalled || cooldown) {
 554		if (stalled)
 555			schedule_delayed_work(&acm->dwork, 0);
 556		else if (cooldown)
 557			schedule_delayed_work(&acm->dwork, HZ / 2);
 558		return;
 559	}
 560
 561	if (test_bit(ACM_THROTTLED, &acm->flags))
 562		return;
 563
 564	acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 565}
 566
 567/* data interface wrote those outgoing bytes */
 568static void acm_write_bulk(struct urb *urb)
 569{
 570	struct acm_wb *wb = urb->context;
 571	struct acm *acm = wb->instance;
 572	unsigned long flags;
 573	int status = urb->status;
 574
 575	if (status || (urb->actual_length != urb->transfer_buffer_length))
 576		dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
 577			urb->actual_length,
 578			urb->transfer_buffer_length,
 579			status);
 580
 581	spin_lock_irqsave(&acm->write_lock, flags);
 582	acm_write_done(acm, wb);
 583	spin_unlock_irqrestore(&acm->write_lock, flags);
 584	set_bit(EVENT_TTY_WAKEUP, &acm->flags);
 585	schedule_delayed_work(&acm->dwork, 0);
 586}
 587
 588static void acm_softint(struct work_struct *work)
 589{
 590	int i;
 591	struct acm *acm = container_of(work, struct acm, dwork.work);
 592
 593	if (test_bit(EVENT_RX_STALL, &acm->flags)) {
 594		smp_mb(); /* against acm_suspend() */
 595		if (!acm->susp_count) {
 596			for (i = 0; i < acm->rx_buflimit; i++)
 597				usb_kill_urb(acm->read_urbs[i]);
 598			usb_clear_halt(acm->dev, acm->in);
 599			acm_submit_read_urbs(acm, GFP_KERNEL);
 600			clear_bit(EVENT_RX_STALL, &acm->flags);
 601		}
 602	}
 603
 604	if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
 605		for (i = 0; i < acm->rx_buflimit; i++)
 606			if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
 607				acm_submit_read_urb(acm, i, GFP_KERNEL);
 608	}
 609
 610	if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
 611		tty_port_tty_wakeup(&acm->port);
 612}
 613
 614/*
 615 * TTY handlers
 616 */
 617
 618static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 619{
 620	struct acm *acm;
 621	int retval;
 622
 623	acm = acm_get_by_minor(tty->index);
 624	if (!acm)
 625		return -ENODEV;
 626
 627	retval = tty_standard_install(driver, tty);
 628	if (retval)
 629		goto error_init_termios;
 630
 631	/*
 632	 * Suppress initial echoing for some devices which might send data
 633	 * immediately after acm driver has been installed.
 634	 */
 635	if (acm->quirks & DISABLE_ECHO)
 636		tty->termios.c_lflag &= ~ECHO;
 637
 638	tty->driver_data = acm;
 639
 640	return 0;
 641
 642error_init_termios:
 643	tty_port_put(&acm->port);
 644	return retval;
 645}
 646
 647static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 648{
 649	struct acm *acm = tty->driver_data;
 650
 651	return tty_port_open(&acm->port, tty, filp);
 652}
 653
 654static void acm_port_dtr_rts(struct tty_port *port, int raise)
 655{
 656	struct acm *acm = container_of(port, struct acm, port);
 657	int val;
 658	int res;
 659
 660	if (raise)
 661		val = USB_CDC_CTRL_DTR | USB_CDC_CTRL_RTS;
 662	else
 663		val = 0;
 664
 665	/* FIXME: add missing ctrlout locking throughout driver */
 666	acm->ctrlout = val;
 667
 668	res = acm_set_control(acm, val);
 669	if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 670		/* This is broken in too many devices to spam the logs */
 671		dev_dbg(&acm->control->dev, "failed to set dtr/rts\n");
 672}
 673
 674static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 675{
 676	struct acm *acm = container_of(port, struct acm, port);
 677	int retval = -ENODEV;
 678	int i;
 679
 680	mutex_lock(&acm->mutex);
 681	if (acm->disconnected)
 682		goto disconnected;
 683
 684	retval = usb_autopm_get_interface(acm->control);
 685	if (retval)
 686		goto error_get_interface;
 687
 
 
 
 
 688	set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 689	acm->control->needs_remote_wakeup = 1;
 690
 691	acm->ctrlurb->dev = acm->dev;
 692	retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 693	if (retval) {
 694		dev_err(&acm->control->dev,
 695			"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 696		goto error_submit_urb;
 697	}
 698
 699	acm_tty_set_termios(tty, NULL);
 700
 701	/*
 702	 * Unthrottle device in case the TTY was closed while throttled.
 703	 */
 704	clear_bit(ACM_THROTTLED, &acm->flags);
 705
 706	retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 707	if (retval)
 708		goto error_submit_read_urbs;
 709
 710	usb_autopm_put_interface(acm->control);
 711
 712	mutex_unlock(&acm->mutex);
 713
 714	return 0;
 715
 716error_submit_read_urbs:
 717	for (i = 0; i < acm->rx_buflimit; i++)
 718		usb_kill_urb(acm->read_urbs[i]);
 719	usb_kill_urb(acm->ctrlurb);
 720error_submit_urb:
 721	usb_autopm_put_interface(acm->control);
 722error_get_interface:
 723disconnected:
 724	mutex_unlock(&acm->mutex);
 725
 726	return usb_translate_errors(retval);
 727}
 728
 729static void acm_port_destruct(struct tty_port *port)
 730{
 731	struct acm *acm = container_of(port, struct acm, port);
 732
 733	if (acm->minor != ACM_MINOR_INVALID)
 734		acm_release_minor(acm);
 735	usb_put_intf(acm->control);
 736	kfree(acm->country_codes);
 737	kfree(acm);
 738}
 739
 740static void acm_port_shutdown(struct tty_port *port)
 741{
 742	struct acm *acm = container_of(port, struct acm, port);
 743	struct urb *urb;
 744	struct acm_wb *wb;
 745
 746	/*
 747	 * Need to grab write_lock to prevent race with resume, but no need to
 748	 * hold it due to the tty-port initialised flag.
 749	 */
 750	acm_poison_urbs(acm);
 751	spin_lock_irq(&acm->write_lock);
 752	spin_unlock_irq(&acm->write_lock);
 753
 754	usb_autopm_get_interface_no_resume(acm->control);
 755	acm->control->needs_remote_wakeup = 0;
 756	usb_autopm_put_interface(acm->control);
 757
 758	for (;;) {
 759		urb = usb_get_from_anchor(&acm->delayed);
 760		if (!urb)
 761			break;
 762		wb = urb->context;
 763		wb->use = false;
 764		usb_autopm_put_interface_async(acm->control);
 765	}
 766
 767	acm_unpoison_urbs(acm);
 768
 769}
 770
 771static void acm_tty_cleanup(struct tty_struct *tty)
 772{
 773	struct acm *acm = tty->driver_data;
 774
 775	tty_port_put(&acm->port);
 776}
 777
 778static void acm_tty_hangup(struct tty_struct *tty)
 779{
 780	struct acm *acm = tty->driver_data;
 781
 782	tty_port_hangup(&acm->port);
 783}
 784
 785static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 786{
 787	struct acm *acm = tty->driver_data;
 788
 789	tty_port_close(&acm->port, tty, filp);
 790}
 791
 792static int acm_tty_write(struct tty_struct *tty,
 793					const unsigned char *buf, int count)
 794{
 795	struct acm *acm = tty->driver_data;
 796	int stat;
 797	unsigned long flags;
 798	int wbn;
 799	struct acm_wb *wb;
 800
 801	if (!count)
 802		return 0;
 803
 804	dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
 805
 806	spin_lock_irqsave(&acm->write_lock, flags);
 807	wbn = acm_wb_alloc(acm);
 808	if (wbn < 0) {
 809		spin_unlock_irqrestore(&acm->write_lock, flags);
 810		return 0;
 811	}
 812	wb = &acm->wb[wbn];
 813
 814	if (!acm->dev) {
 815		wb->use = false;
 816		spin_unlock_irqrestore(&acm->write_lock, flags);
 817		return -ENODEV;
 818	}
 819
 820	count = (count > acm->writesize) ? acm->writesize : count;
 821	dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
 822	memcpy(wb->buf, buf, count);
 823	wb->len = count;
 824
 825	stat = usb_autopm_get_interface_async(acm->control);
 826	if (stat) {
 827		wb->use = false;
 828		spin_unlock_irqrestore(&acm->write_lock, flags);
 829		return stat;
 830	}
 831
 832	if (acm->susp_count) {
 833		usb_anchor_urb(wb->urb, &acm->delayed);
 834		spin_unlock_irqrestore(&acm->write_lock, flags);
 835		return count;
 836	}
 837
 838	stat = acm_start_wb(acm, wb);
 839	spin_unlock_irqrestore(&acm->write_lock, flags);
 840
 841	if (stat < 0)
 842		return stat;
 843	return count;
 844}
 845
 846static unsigned int acm_tty_write_room(struct tty_struct *tty)
 847{
 848	struct acm *acm = tty->driver_data;
 849	/*
 850	 * Do not let the line discipline to know that we have a reserve,
 851	 * or it might get too enthusiastic.
 852	 */
 853	return acm_wb_is_avail(acm) ? acm->writesize : 0;
 854}
 855
 856static unsigned int acm_tty_chars_in_buffer(struct tty_struct *tty)
 857{
 858	struct acm *acm = tty->driver_data;
 859	/*
 860	 * if the device was unplugged then any remaining characters fell out
 861	 * of the connector ;)
 862	 */
 863	if (acm->disconnected)
 864		return 0;
 865	/*
 866	 * This is inaccurate (overcounts), but it works.
 867	 */
 868	return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 869}
 870
 871static void acm_tty_throttle(struct tty_struct *tty)
 872{
 873	struct acm *acm = tty->driver_data;
 874
 875	set_bit(ACM_THROTTLED, &acm->flags);
 876}
 877
 878static void acm_tty_unthrottle(struct tty_struct *tty)
 879{
 880	struct acm *acm = tty->driver_data;
 881
 882	clear_bit(ACM_THROTTLED, &acm->flags);
 883
 884	/* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
 885	smp_mb();
 886
 887	acm_submit_read_urbs(acm, GFP_KERNEL);
 888}
 889
 890static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 891{
 892	struct acm *acm = tty->driver_data;
 893	int retval;
 894
 895	retval = acm_send_break(acm, state ? 0xffff : 0);
 896	if (retval < 0)
 897		dev_dbg(&acm->control->dev,
 898			"%s - send break failed\n", __func__);
 899	return retval;
 900}
 901
 902static int acm_tty_tiocmget(struct tty_struct *tty)
 903{
 904	struct acm *acm = tty->driver_data;
 905
 906	return (acm->ctrlout & USB_CDC_CTRL_DTR ? TIOCM_DTR : 0) |
 907	       (acm->ctrlout & USB_CDC_CTRL_RTS ? TIOCM_RTS : 0) |
 908	       (acm->ctrlin  & USB_CDC_SERIAL_STATE_DSR ? TIOCM_DSR : 0) |
 909	       (acm->ctrlin  & USB_CDC_SERIAL_STATE_RING_SIGNAL ? TIOCM_RI : 0) |
 910	       (acm->ctrlin  & USB_CDC_SERIAL_STATE_DCD ? TIOCM_CD : 0) |
 911	       TIOCM_CTS;
 912}
 913
 914static int acm_tty_tiocmset(struct tty_struct *tty,
 915			    unsigned int set, unsigned int clear)
 916{
 917	struct acm *acm = tty->driver_data;
 918	unsigned int newctrl;
 919
 920	newctrl = acm->ctrlout;
 921	set = (set & TIOCM_DTR ? USB_CDC_CTRL_DTR : 0) |
 922	      (set & TIOCM_RTS ? USB_CDC_CTRL_RTS : 0);
 923	clear = (clear & TIOCM_DTR ? USB_CDC_CTRL_DTR : 0) |
 924		(clear & TIOCM_RTS ? USB_CDC_CTRL_RTS : 0);
 925
 926	newctrl = (newctrl & ~clear) | set;
 927
 928	if (acm->ctrlout == newctrl)
 929		return 0;
 930	return acm_set_control(acm, acm->ctrlout = newctrl);
 931}
 932
 933static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 934{
 935	struct acm *acm = tty->driver_data;
 936
 937	ss->line = acm->minor;
 938	ss->close_delay	= jiffies_to_msecs(acm->port.close_delay) / 10;
 
 939	ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 940				ASYNC_CLOSING_WAIT_NONE :
 941				jiffies_to_msecs(acm->port.closing_wait) / 10;
 942	return 0;
 943}
 944
 945static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 946{
 947	struct acm *acm = tty->driver_data;
 948	unsigned int closing_wait, close_delay;
 949	int retval = 0;
 950
 951	close_delay = msecs_to_jiffies(ss->close_delay * 10);
 952	closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 953			ASYNC_CLOSING_WAIT_NONE :
 954			msecs_to_jiffies(ss->closing_wait * 10);
 955
 956	mutex_lock(&acm->port.mutex);
 957
 958	if (!capable(CAP_SYS_ADMIN)) {
 959		if ((close_delay != acm->port.close_delay) ||
 960		    (closing_wait != acm->port.closing_wait))
 961			retval = -EPERM;
 
 
 962	} else {
 963		acm->port.close_delay  = close_delay;
 964		acm->port.closing_wait = closing_wait;
 965	}
 966
 967	mutex_unlock(&acm->port.mutex);
 968	return retval;
 969}
 970
 971static int wait_serial_change(struct acm *acm, unsigned long arg)
 972{
 973	int rv = 0;
 974	DECLARE_WAITQUEUE(wait, current);
 975	struct async_icount old, new;
 976
 977	do {
 978		spin_lock_irq(&acm->read_lock);
 979		old = acm->oldcount;
 980		new = acm->iocount;
 981		acm->oldcount = new;
 982		spin_unlock_irq(&acm->read_lock);
 983
 984		if ((arg & TIOCM_DSR) &&
 985			old.dsr != new.dsr)
 986			break;
 987		if ((arg & TIOCM_CD)  &&
 988			old.dcd != new.dcd)
 989			break;
 990		if ((arg & TIOCM_RI) &&
 991			old.rng != new.rng)
 992			break;
 993
 994		add_wait_queue(&acm->wioctl, &wait);
 995		set_current_state(TASK_INTERRUPTIBLE);
 996		schedule();
 997		remove_wait_queue(&acm->wioctl, &wait);
 998		if (acm->disconnected) {
 999			if (arg & TIOCM_CD)
1000				break;
1001			else
1002				rv = -ENODEV;
1003		} else {
1004			if (signal_pending(current))
1005				rv = -ERESTARTSYS;
1006		}
1007	} while (!rv);
1008
1009	
1010
1011	return rv;
1012}
1013
1014static int acm_tty_get_icount(struct tty_struct *tty,
1015					struct serial_icounter_struct *icount)
1016{
1017	struct acm *acm = tty->driver_data;
1018
1019	icount->dsr = acm->iocount.dsr;
1020	icount->rng = acm->iocount.rng;
1021	icount->dcd = acm->iocount.dcd;
1022	icount->frame = acm->iocount.frame;
1023	icount->overrun = acm->iocount.overrun;
1024	icount->parity = acm->iocount.parity;
1025	icount->brk = acm->iocount.brk;
1026
1027	return 0;
1028}
1029
1030static int acm_tty_ioctl(struct tty_struct *tty,
1031					unsigned int cmd, unsigned long arg)
1032{
1033	struct acm *acm = tty->driver_data;
1034	int rv = -ENOIOCTLCMD;
1035
1036	switch (cmd) {
1037	case TIOCMIWAIT:
1038		rv = usb_autopm_get_interface(acm->control);
1039		if (rv < 0) {
1040			rv = -EIO;
1041			break;
1042		}
1043		rv = wait_serial_change(acm, arg);
1044		usb_autopm_put_interface(acm->control);
1045		break;
1046	}
1047
1048	return rv;
1049}
1050
1051static void acm_tty_set_termios(struct tty_struct *tty,
1052				const struct ktermios *termios_old)
1053{
1054	struct acm *acm = tty->driver_data;
1055	struct ktermios *termios = &tty->termios;
1056	struct usb_cdc_line_coding newline;
1057	int newctrl = acm->ctrlout;
1058
1059	newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1060	newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1061	newline.bParityType = termios->c_cflag & PARENB ?
1062				(termios->c_cflag & PARODD ? 1 : 2) +
1063				(termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1064	newline.bDataBits = tty_get_char_size(termios->c_cflag);
1065
 
 
 
 
 
 
 
 
 
 
 
 
 
1066	/* FIXME: Needs to clear unsupported bits in the termios */
1067	acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1068
1069	if (C_BAUD(tty) == B0) {
1070		newline.dwDTERate = acm->line.dwDTERate;
1071		newctrl &= ~USB_CDC_CTRL_DTR;
1072	} else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1073		newctrl |=  USB_CDC_CTRL_DTR;
1074	}
1075
1076	if (newctrl != acm->ctrlout)
1077		acm_set_control(acm, acm->ctrlout = newctrl);
1078
1079	if (memcmp(&acm->line, &newline, sizeof newline)) {
1080		memcpy(&acm->line, &newline, sizeof newline);
1081		dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1082			__func__,
1083			le32_to_cpu(newline.dwDTERate),
1084			newline.bCharFormat, newline.bParityType,
1085			newline.bDataBits);
1086		acm_set_line(acm, &acm->line);
1087	}
1088}
1089
1090static const struct tty_port_operations acm_port_ops = {
1091	.dtr_rts = acm_port_dtr_rts,
1092	.shutdown = acm_port_shutdown,
1093	.activate = acm_port_activate,
1094	.destruct = acm_port_destruct,
1095};
1096
1097/*
1098 * USB probe and disconnect routines.
1099 */
1100
1101/* Little helpers: write/read buffers free */
1102static void acm_write_buffers_free(struct acm *acm)
1103{
1104	int i;
1105	struct acm_wb *wb;
1106
1107	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1108		usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1109}
1110
1111static void acm_read_buffers_free(struct acm *acm)
1112{
1113	int i;
1114
1115	for (i = 0; i < acm->rx_buflimit; i++)
1116		usb_free_coherent(acm->dev, acm->readsize,
1117			  acm->read_buffers[i].base, acm->read_buffers[i].dma);
1118}
1119
1120/* Little helper: write buffers allocate */
1121static int acm_write_buffers_alloc(struct acm *acm)
1122{
1123	int i;
1124	struct acm_wb *wb;
1125
1126	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1127		wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1128		    &wb->dmah);
1129		if (!wb->buf) {
1130			while (i != 0) {
1131				--i;
1132				--wb;
1133				usb_free_coherent(acm->dev, acm->writesize,
1134				    wb->buf, wb->dmah);
1135			}
1136			return -ENOMEM;
1137		}
1138	}
1139	return 0;
1140}
1141
1142static int acm_probe(struct usb_interface *intf,
1143		     const struct usb_device_id *id)
1144{
1145	struct usb_cdc_union_desc *union_header = NULL;
1146	struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1147	unsigned char *buffer = intf->altsetting->extra;
1148	int buflen = intf->altsetting->extralen;
1149	struct usb_interface *control_interface;
1150	struct usb_interface *data_interface;
1151	struct usb_endpoint_descriptor *epctrl = NULL;
1152	struct usb_endpoint_descriptor *epread = NULL;
1153	struct usb_endpoint_descriptor *epwrite = NULL;
1154	struct usb_device *usb_dev = interface_to_usbdev(intf);
1155	struct usb_cdc_parsed_header h;
1156	struct acm *acm;
1157	int minor;
1158	int ctrlsize, readsize;
1159	u8 *buf;
1160	int call_intf_num = -1;
1161	int data_intf_num = -1;
1162	unsigned long quirks;
1163	int num_rx_buf;
1164	int i;
1165	int combined_interfaces = 0;
1166	struct device *tty_dev;
1167	int rv = -ENOMEM;
1168	int res;
1169
1170	/* normal quirks */
1171	quirks = (unsigned long)id->driver_info;
1172
1173	if (quirks == IGNORE_DEVICE)
1174		return -ENODEV;
1175
1176	memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1177
1178	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1179
1180	/* handle quirks deadly to normal probing*/
1181	if (quirks == NO_UNION_NORMAL) {
1182		data_interface = usb_ifnum_to_if(usb_dev, 1);
1183		control_interface = usb_ifnum_to_if(usb_dev, 0);
1184		/* we would crash */
1185		if (!data_interface || !control_interface)
1186			return -ENODEV;
1187		goto skip_normal_probe;
1188	}
1189
1190	/* normal probing*/
1191	if (!buffer) {
1192		dev_err(&intf->dev, "Weird descriptor references\n");
1193		return -EINVAL;
1194	}
1195
 
 
 
1196	if (!buflen) {
1197		if (intf->cur_altsetting->endpoint &&
1198				intf->cur_altsetting->endpoint->extralen &&
1199				intf->cur_altsetting->endpoint->extra) {
1200			dev_dbg(&intf->dev,
1201				"Seeking extra descriptors on endpoint\n");
1202			buflen = intf->cur_altsetting->endpoint->extralen;
1203			buffer = intf->cur_altsetting->endpoint->extra;
1204		} else {
1205			dev_err(&intf->dev,
1206				"Zero length descriptor references\n");
1207			return -EINVAL;
1208		}
1209	}
1210
1211	cdc_parse_cdc_header(&h, intf, buffer, buflen);
1212	union_header = h.usb_cdc_union_desc;
1213	cmgmd = h.usb_cdc_call_mgmt_descriptor;
1214	if (cmgmd)
1215		call_intf_num = cmgmd->bDataInterface;
1216
1217	if (!union_header) {
1218		if (intf->cur_altsetting->desc.bNumEndpoints == 3) {
1219			dev_dbg(&intf->dev, "No union descriptor, assuming single interface\n");
1220			combined_interfaces = 1;
1221			control_interface = data_interface = intf;
1222			goto look_for_collapsed_interface;
1223		} else if (call_intf_num > 0) {
1224			dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1225			data_intf_num = call_intf_num;
1226			data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
 
 
 
 
 
1227			control_interface = intf;
1228		} else {
1229			dev_dbg(&intf->dev, "No union descriptor, giving up\n");
1230			return -ENODEV;
 
 
 
 
 
 
 
1231		}
1232	} else {
1233		int class = -1;
1234
1235		data_intf_num = union_header->bSlaveInterface0;
1236		control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1237		data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1238
1239		if (control_interface)
1240			class = control_interface->cur_altsetting->desc.bInterfaceClass;
1241
1242		if (class != USB_CLASS_COMM && class != USB_CLASS_CDC_DATA) {
1243			dev_dbg(&intf->dev, "Broken union descriptor, assuming single interface\n");
1244			combined_interfaces = 1;
1245			control_interface = data_interface = intf;
1246			goto look_for_collapsed_interface;
1247		}
1248	}
1249
1250	if (!control_interface || !data_interface) {
1251		dev_dbg(&intf->dev, "no interfaces\n");
1252		return -ENODEV;
1253	}
 
 
1254
1255	if (data_intf_num != call_intf_num)
1256		dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1257
1258	if (control_interface == data_interface) {
1259		/* some broken devices designed for windows work this way */
1260		dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1261		combined_interfaces = 1;
1262		/* a popular other OS doesn't use it */
1263		quirks |= NO_CAP_LINE;
1264		if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1265			dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1266			return -EINVAL;
1267		}
1268look_for_collapsed_interface:
1269		res = usb_find_common_endpoints(data_interface->cur_altsetting,
1270				&epread, &epwrite, &epctrl, NULL);
1271		if (res)
1272			return res;
1273
1274		goto made_compressed_probe;
1275	}
1276
1277skip_normal_probe:
1278
1279	/*workaround for switched interfaces */
1280	if (data_interface->cur_altsetting->desc.bInterfaceClass != USB_CLASS_CDC_DATA) {
1281		if (control_interface->cur_altsetting->desc.bInterfaceClass == USB_CLASS_CDC_DATA) {
 
 
1282			dev_dbg(&intf->dev,
1283				"Your device has switched interfaces.\n");
1284			swap(control_interface, data_interface);
1285		} else {
1286			return -EINVAL;
1287		}
1288	}
1289
1290	/* Accept probe requests only for the control interface */
1291	if (!combined_interfaces && intf != control_interface)
1292		return -ENODEV;
1293
 
 
 
 
 
 
 
1294	if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1295	    control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1296		return -EINVAL;
1297
1298	epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1299	epread = &data_interface->cur_altsetting->endpoint[0].desc;
1300	epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1301
1302
1303	/* workaround for switched endpoints */
1304	if (!usb_endpoint_dir_in(epread)) {
1305		/* descriptors are swapped */
1306		dev_dbg(&intf->dev,
1307			"The data interface has switched endpoints\n");
1308		swap(epread, epwrite);
1309	}
1310made_compressed_probe:
1311	dev_dbg(&intf->dev, "interfaces are valid\n");
1312
1313	acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1314	if (!acm)
1315		return -ENOMEM;
1316
1317	tty_port_init(&acm->port);
1318	acm->port.ops = &acm_port_ops;
1319
1320	ctrlsize = usb_endpoint_maxp(epctrl);
1321	readsize = usb_endpoint_maxp(epread) *
1322				(quirks == SINGLE_RX_URB ? 1 : 2);
1323	acm->combined_interfaces = combined_interfaces;
1324	acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1325	acm->control = control_interface;
1326	acm->data = data_interface;
1327
1328	usb_get_intf(acm->control); /* undone in destruct() */
1329
1330	minor = acm_alloc_minor(acm);
1331	if (minor < 0) {
1332		acm->minor = ACM_MINOR_INVALID;
1333		goto err_put_port;
1334	}
1335
1336	acm->minor = minor;
1337	acm->dev = usb_dev;
1338	if (h.usb_cdc_acm_descriptor)
1339		acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1340	if (quirks & NO_CAP_LINE)
1341		acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1342	acm->ctrlsize = ctrlsize;
1343	acm->readsize = readsize;
1344	acm->rx_buflimit = num_rx_buf;
1345	INIT_DELAYED_WORK(&acm->dwork, acm_softint);
1346	init_waitqueue_head(&acm->wioctl);
1347	spin_lock_init(&acm->write_lock);
1348	spin_lock_init(&acm->read_lock);
1349	mutex_init(&acm->mutex);
1350	if (usb_endpoint_xfer_int(epread)) {
1351		acm->bInterval = epread->bInterval;
1352		acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1353	} else {
1354		acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1355	}
1356	if (usb_endpoint_xfer_int(epwrite))
1357		acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1358	else
1359		acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1360	init_usb_anchor(&acm->delayed);
1361	acm->quirks = quirks;
1362
1363	buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1364	if (!buf)
1365		goto err_put_port;
1366	acm->ctrl_buffer = buf;
1367
1368	if (acm_write_buffers_alloc(acm) < 0)
1369		goto err_free_ctrl_buffer;
1370
1371	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1372	if (!acm->ctrlurb)
1373		goto err_free_write_buffers;
1374
1375	for (i = 0; i < num_rx_buf; i++) {
1376		struct acm_rb *rb = &(acm->read_buffers[i]);
1377		struct urb *urb;
1378
1379		rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1380								&rb->dma);
1381		if (!rb->base)
1382			goto err_free_read_urbs;
1383		rb->index = i;
1384		rb->instance = acm;
1385
1386		urb = usb_alloc_urb(0, GFP_KERNEL);
1387		if (!urb)
1388			goto err_free_read_urbs;
1389
1390		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1391		urb->transfer_dma = rb->dma;
1392		if (usb_endpoint_xfer_int(epread))
1393			usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1394					 acm->readsize,
1395					 acm_read_bulk_callback, rb,
1396					 acm->bInterval);
1397		else
1398			usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1399					  acm->readsize,
1400					  acm_read_bulk_callback, rb);
1401
1402		acm->read_urbs[i] = urb;
1403		__set_bit(i, &acm->read_urbs_free);
1404	}
1405	for (i = 0; i < ACM_NW; i++) {
1406		struct acm_wb *snd = &(acm->wb[i]);
1407
1408		snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1409		if (!snd->urb)
1410			goto err_free_write_urbs;
1411
1412		if (usb_endpoint_xfer_int(epwrite))
1413			usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1414				NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1415		else
1416			usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1417				NULL, acm->writesize, acm_write_bulk, snd);
1418		snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1419		if (quirks & SEND_ZERO_PACKET)
1420			snd->urb->transfer_flags |= URB_ZERO_PACKET;
1421		snd->instance = acm;
1422	}
1423
1424	usb_set_intfdata(intf, acm);
1425
1426	i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1427	if (i < 0)
1428		goto err_free_write_urbs;
1429
1430	if (h.usb_cdc_country_functional_desc) { /* export the country data */
1431		struct usb_cdc_country_functional_desc * cfd =
1432					h.usb_cdc_country_functional_desc;
1433
1434		acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1435		if (!acm->country_codes)
1436			goto skip_countries;
1437		acm->country_code_size = cfd->bLength - 4;
1438		memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1439							cfd->bLength - 4);
1440		acm->country_rel_date = cfd->iCountryCodeRelDate;
1441
1442		i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1443		if (i < 0) {
1444			kfree(acm->country_codes);
1445			acm->country_codes = NULL;
1446			acm->country_code_size = 0;
1447			goto skip_countries;
1448		}
1449
1450		i = device_create_file(&intf->dev,
1451						&dev_attr_iCountryCodeRelDate);
1452		if (i < 0) {
1453			device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1454			kfree(acm->country_codes);
1455			acm->country_codes = NULL;
1456			acm->country_code_size = 0;
1457			goto skip_countries;
1458		}
1459	}
1460
1461skip_countries:
1462	usb_fill_int_urb(acm->ctrlurb, usb_dev,
1463			 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1464			 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1465			 /* works around buggy devices */
1466			 epctrl->bInterval ? epctrl->bInterval : 16);
1467	acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1468	acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1469	acm->notification_buffer = NULL;
1470	acm->nb_index = 0;
1471	acm->nb_size = 0;
1472
 
 
1473	acm->line.dwDTERate = cpu_to_le32(9600);
1474	acm->line.bDataBits = 8;
1475	acm_set_line(acm, &acm->line);
1476
1477	if (!acm->combined_interfaces) {
1478		rv = usb_driver_claim_interface(&acm_driver, data_interface, acm);
1479		if (rv)
1480			goto err_remove_files;
1481	}
1482
1483	tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1484			&control_interface->dev);
1485	if (IS_ERR(tty_dev)) {
1486		rv = PTR_ERR(tty_dev);
1487		goto err_release_data_interface;
1488	}
1489
1490	if (quirks & CLEAR_HALT_CONDITIONS) {
1491		usb_clear_halt(usb_dev, acm->in);
1492		usb_clear_halt(usb_dev, acm->out);
1493	}
1494
1495	dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1496
1497	return 0;
1498
1499err_release_data_interface:
1500	if (!acm->combined_interfaces) {
1501		/* Clear driver data so that disconnect() returns early. */
1502		usb_set_intfdata(data_interface, NULL);
1503		usb_driver_release_interface(&acm_driver, data_interface);
1504	}
1505err_remove_files:
1506	if (acm->country_codes) {
1507		device_remove_file(&acm->control->dev,
1508				&dev_attr_wCountryCodes);
1509		device_remove_file(&acm->control->dev,
1510				&dev_attr_iCountryCodeRelDate);
 
1511	}
1512	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1513err_free_write_urbs:
 
1514	for (i = 0; i < ACM_NW; i++)
1515		usb_free_urb(acm->wb[i].urb);
1516err_free_read_urbs:
1517	for (i = 0; i < num_rx_buf; i++)
1518		usb_free_urb(acm->read_urbs[i]);
1519	acm_read_buffers_free(acm);
1520	usb_free_urb(acm->ctrlurb);
1521err_free_write_buffers:
1522	acm_write_buffers_free(acm);
1523err_free_ctrl_buffer:
1524	usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1525err_put_port:
1526	tty_port_put(&acm->port);
1527
1528	return rv;
1529}
1530
1531static void acm_disconnect(struct usb_interface *intf)
1532{
1533	struct acm *acm = usb_get_intfdata(intf);
1534	struct tty_struct *tty;
1535	int i;
1536
1537	/* sibling interface is already cleaning up */
1538	if (!acm)
1539		return;
1540
1541	acm->disconnected = true;
1542	/*
1543	 * there is a circular dependency. acm_softint() can resubmit
1544	 * the URBs in error handling so we need to block any
1545	 * submission right away
1546	 */
1547	acm_poison_urbs(acm);
1548	mutex_lock(&acm->mutex);
 
1549	if (acm->country_codes) {
1550		device_remove_file(&acm->control->dev,
1551				&dev_attr_wCountryCodes);
1552		device_remove_file(&acm->control->dev,
1553				&dev_attr_iCountryCodeRelDate);
1554	}
1555	wake_up_all(&acm->wioctl);
1556	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1557	usb_set_intfdata(acm->control, NULL);
1558	usb_set_intfdata(acm->data, NULL);
1559	mutex_unlock(&acm->mutex);
1560
1561	tty = tty_port_tty_get(&acm->port);
1562	if (tty) {
1563		tty_vhangup(tty);
1564		tty_kref_put(tty);
1565	}
1566
1567	cancel_delayed_work_sync(&acm->dwork);
 
1568
1569	tty_unregister_device(acm_tty_driver, acm->minor);
1570
1571	usb_free_urb(acm->ctrlurb);
1572	for (i = 0; i < ACM_NW; i++)
1573		usb_free_urb(acm->wb[i].urb);
1574	for (i = 0; i < acm->rx_buflimit; i++)
1575		usb_free_urb(acm->read_urbs[i]);
1576	acm_write_buffers_free(acm);
1577	usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1578	acm_read_buffers_free(acm);
1579
1580	kfree(acm->notification_buffer);
1581
1582	if (!acm->combined_interfaces)
1583		usb_driver_release_interface(&acm_driver, intf == acm->control ?
1584					acm->data : acm->control);
1585
1586	tty_port_put(&acm->port);
1587}
1588
1589#ifdef CONFIG_PM
1590static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1591{
1592	struct acm *acm = usb_get_intfdata(intf);
1593	int cnt;
1594
1595	spin_lock_irq(&acm->write_lock);
1596	if (PMSG_IS_AUTO(message)) {
1597		if (acm->transmitting) {
1598			spin_unlock_irq(&acm->write_lock);
1599			return -EBUSY;
1600		}
1601	}
1602	cnt = acm->susp_count++;
1603	spin_unlock_irq(&acm->write_lock);
1604
1605	if (cnt)
1606		return 0;
1607
1608	acm_poison_urbs(acm);
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	acm_unpoison_urbs(acm);
1627
1628	if (tty_port_initialized(&acm->port)) {
1629		rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1630
1631		for (;;) {
1632			urb = usb_get_from_anchor(&acm->delayed);
1633			if (!urb)
1634				break;
1635
1636			acm_start_wb(acm, urb->context);
1637		}
1638
1639		/*
1640		 * delayed error checking because we must
1641		 * do the write path at all cost
1642		 */
1643		if (rv < 0)
1644			goto out;
1645
1646		rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1647	}
1648out:
1649	spin_unlock_irq(&acm->write_lock);
1650
1651	return rv;
1652}
1653
1654static int acm_reset_resume(struct usb_interface *intf)
1655{
1656	struct acm *acm = usb_get_intfdata(intf);
1657
1658	if (tty_port_initialized(&acm->port))
1659		tty_port_tty_hangup(&acm->port, false);
1660
1661	return acm_resume(intf);
1662}
1663
1664#endif /* CONFIG_PM */
1665
1666static int acm_pre_reset(struct usb_interface *intf)
1667{
1668	struct acm *acm = usb_get_intfdata(intf);
1669
1670	clear_bit(EVENT_RX_STALL, &acm->flags);
1671	acm->nb_index = 0; /* pending control transfers are lost */
1672
1673	return 0;
1674}
1675
1676#define NOKIA_PCSUITE_ACM_INFO(x) \
1677		USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1678		USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1679		USB_CDC_ACM_PROTO_VENDOR)
1680
1681#define SAMSUNG_PCSUITE_ACM_INFO(x) \
1682		USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1683		USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1684		USB_CDC_ACM_PROTO_VENDOR)
1685
1686/*
1687 * USB driver structure.
1688 */
1689
1690static const struct usb_device_id acm_ids[] = {
1691	/* quirky and broken devices */
1692	{ USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1693	  .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
1694	{ USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1695	.driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1696	{ USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1697	.driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1698	{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1699	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1700	},
1701	{ USB_DEVICE(0x045b, 0x023c),	/* Renesas USB Download mode */
1702	.driver_info = DISABLE_ECHO,	/* Don't echo banner */
1703	},
1704	{ USB_DEVICE(0x045b, 0x0248),	/* Renesas USB Download mode */
1705	.driver_info = DISABLE_ECHO,	/* Don't echo banner */
1706	},
1707	{ USB_DEVICE(0x045b, 0x024D),	/* Renesas USB Download mode */
1708	.driver_info = DISABLE_ECHO,	/* Don't echo banner */
1709	},
1710	{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1711	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1712	},
1713	{ USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1714	.driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1715	},
1716	{ USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1717	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1718	},
1719	{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1720	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1721	},
1722	{ USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1723	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1724	},
1725	{ USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1726	.driver_info = SINGLE_RX_URB,
1727	},
1728	{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1729	.driver_info = SINGLE_RX_URB, /* firmware bug */
1730	},
1731	{ USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1732	.driver_info = SINGLE_RX_URB, /* firmware bug */
1733	},
1734	{ USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1735	.driver_info = SINGLE_RX_URB,
1736	},
1737	{ USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1738	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1739	},
1740	{ USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1741	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1742	},
1743	{ USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1744	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1745	},
1746	{ USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1747	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1748	},
1749	{ USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1750	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1751	},
1752	{ USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1753	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1754	},
1755	{ USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1756	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1757	},
1758	{ USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1759	.driver_info = QUIRK_CONTROL_LINE_STATE, },
1760	{ USB_DEVICE(0x2184, 0x001c) },	/* GW Instek AFG-2225 */
1761	{ USB_DEVICE(0x2184, 0x0036) },	/* GW Instek AFG-125 */
1762	{ USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1763	},
1764	/* Motorola H24 HSPA module: */
1765	{ USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1766	{ USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1767	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1768	},
1769	{ USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1770	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1771	},
1772	{ USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1773	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1774	},
1775	{ USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1776	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1777	},
1778	{ USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1779	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1780	},
1781	{ USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1782	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1783	},
1784	{ USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1785	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1786	},
1787
1788	{ USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1789	.driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1790					   data interface instead of
1791					   communications interface.
1792					   Maybe we should define a new
1793					   quirk for this. */
1794	},
1795	{ USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1796	.driver_info = NO_UNION_NORMAL,
1797	},
1798	{ USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1799	.driver_info = NO_UNION_NORMAL,
1800	},
1801	{ USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1802	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1803	},
1804	{ USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1805	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1806	},
1807	{ USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1808	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1809	},
1810	{ USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1811	.driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1812	},
1813	{ USB_DEVICE(0x0c26, 0x0020), /* Icom ICF3400 Serie */
1814	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1815	},
1816	{ USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1817	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1818	},
1819
1820	{ USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1821	.driver_info = CLEAR_HALT_CONDITIONS,
1822	},
1823
1824	/* Nokia S60 phones expose two ACM channels. The first is
1825	 * a modem and is picked up by the standard AT-command
1826	 * information below. The second is 'vendor-specific' but
1827	 * is treated as a serial device at the S60 end, so we want
1828	 * to expose it on Linux too. */
1829	{ NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1830	{ NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1831	{ NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1832	{ NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1833	{ NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1834	{ NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1835	{ NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1836	{ NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1837	{ NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1838	{ NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1839	{ NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1840	{ NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1841	{ NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1842	{ NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1843	{ NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1844	{ NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1845	{ NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1846	{ NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1847	{ NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1848	{ NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1849	{ NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1850	{ NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1851	{ NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1852	{ NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1853	{ NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1854	{ NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1855	{ NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1856	{ NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1857	{ NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1858	{ NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1859	{ NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1860	{ NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
 
1861	{ NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1862	{ NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1863	{ NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1864	{ NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1865	{ NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1866	{ NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1867	{ NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1868	{ NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1869	{ NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1870	{ NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1871	{ NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1872	{ NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1873	{ NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1874	{ NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1875	{ NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1876	{ NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1877	{ NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1878	{ NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1879	{ NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1880	{ NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1881	{ NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1882	{ NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1883	{ NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1884	{ NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1885	{ SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1886
1887	/* Support for Owen devices */
1888	{ USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1889
1890	/* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1891
 
 
 
 
 
1892#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1893	{ USB_DEVICE(0x04d8, 0x0082),	/* Application mode */
1894	.driver_info = IGNORE_DEVICE,
1895	},
1896	{ USB_DEVICE(0x04d8, 0x0083),	/* Bootloader mode */
1897	.driver_info = IGNORE_DEVICE,
1898	},
1899#endif
1900
1901#if IS_ENABLED(CONFIG_IR_TOY)
1902	{ USB_DEVICE(0x04d8, 0xfd08),
1903	.driver_info = IGNORE_DEVICE,
1904	},
1905
1906	{ USB_DEVICE(0x04d8, 0xf58b),
1907	.driver_info = IGNORE_DEVICE,
1908	},
1909#endif
1910
1911#if IS_ENABLED(CONFIG_USB_SERIAL_XR)
1912	{ USB_DEVICE(0x04e2, 0x1400), .driver_info = IGNORE_DEVICE },
1913	{ USB_DEVICE(0x04e2, 0x1401), .driver_info = IGNORE_DEVICE },
1914	{ USB_DEVICE(0x04e2, 0x1402), .driver_info = IGNORE_DEVICE },
1915	{ USB_DEVICE(0x04e2, 0x1403), .driver_info = IGNORE_DEVICE },
1916	{ USB_DEVICE(0x04e2, 0x1410), .driver_info = IGNORE_DEVICE },
1917	{ USB_DEVICE(0x04e2, 0x1411), .driver_info = IGNORE_DEVICE },
1918	{ USB_DEVICE(0x04e2, 0x1412), .driver_info = IGNORE_DEVICE },
1919	{ USB_DEVICE(0x04e2, 0x1414), .driver_info = IGNORE_DEVICE },
1920	{ USB_DEVICE(0x04e2, 0x1420), .driver_info = IGNORE_DEVICE },
1921	{ USB_DEVICE(0x04e2, 0x1422), .driver_info = IGNORE_DEVICE },
1922	{ USB_DEVICE(0x04e2, 0x1424), .driver_info = IGNORE_DEVICE },
1923#endif
1924
1925	/*Samsung phone in firmware update mode */
1926	{ USB_DEVICE(0x04e8, 0x685d),
1927	.driver_info = IGNORE_DEVICE,
1928	},
1929
1930	/* Exclude Infineon Flash Loader utility */
1931	{ USB_DEVICE(0x058b, 0x0041),
1932	.driver_info = IGNORE_DEVICE,
1933	},
1934
1935	/* Exclude ETAS ES58x */
1936	{ USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
1937	.driver_info = IGNORE_DEVICE,
1938	},
1939	{ USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
1940	.driver_info = IGNORE_DEVICE,
1941	},
1942	{ USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
1943	.driver_info = IGNORE_DEVICE,
1944	},
1945
1946	{ USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1947	.driver_info = SEND_ZERO_PACKET,
1948	},
1949	{ USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1950	.driver_info = SEND_ZERO_PACKET,
1951	},
1952
1953	/* Exclude Goodix Fingerprint Reader */
1954	{ USB_DEVICE(0x27c6, 0x5395),
1955	.driver_info = IGNORE_DEVICE,
1956	},
1957
1958	/* Exclude Heimann Sensor GmbH USB appset demo */
1959	{ USB_DEVICE(0x32a7, 0x0000),
1960	.driver_info = IGNORE_DEVICE,
1961	},
1962
1963	/* control interfaces without any protocol set */
1964	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1965		USB_CDC_PROTO_NONE) },
1966
1967	/* control interfaces with various AT-command sets */
1968	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1969		USB_CDC_ACM_PROTO_AT_V25TER) },
1970	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1971		USB_CDC_ACM_PROTO_AT_PCCA101) },
1972	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1973		USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1974	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1975		USB_CDC_ACM_PROTO_AT_GSM) },
1976	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1977		USB_CDC_ACM_PROTO_AT_3G) },
1978	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1979		USB_CDC_ACM_PROTO_AT_CDMA) },
1980
1981	{ USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1982	.driver_info = SEND_ZERO_PACKET,
1983	},
1984
1985	{ }
1986};
1987
1988MODULE_DEVICE_TABLE(usb, acm_ids);
1989
1990static struct usb_driver acm_driver = {
1991	.name =		"cdc_acm",
1992	.probe =	acm_probe,
1993	.disconnect =	acm_disconnect,
1994#ifdef CONFIG_PM
1995	.suspend =	acm_suspend,
1996	.resume =	acm_resume,
1997	.reset_resume =	acm_reset_resume,
1998#endif
1999	.pre_reset =	acm_pre_reset,
2000	.id_table =	acm_ids,
2001#ifdef CONFIG_PM
2002	.supports_autosuspend = 1,
2003#endif
2004	.disable_hub_initiated_lpm = 1,
2005};
2006
2007/*
2008 * TTY driver structures.
2009 */
2010
2011static const struct tty_operations acm_ops = {
2012	.install =		acm_tty_install,
2013	.open =			acm_tty_open,
2014	.close =		acm_tty_close,
2015	.cleanup =		acm_tty_cleanup,
2016	.hangup =		acm_tty_hangup,
2017	.write =		acm_tty_write,
2018	.write_room =		acm_tty_write_room,
2019	.ioctl =		acm_tty_ioctl,
2020	.throttle =		acm_tty_throttle,
2021	.unthrottle =		acm_tty_unthrottle,
2022	.chars_in_buffer =	acm_tty_chars_in_buffer,
2023	.break_ctl =		acm_tty_break_ctl,
2024	.set_termios =		acm_tty_set_termios,
2025	.tiocmget =		acm_tty_tiocmget,
2026	.tiocmset =		acm_tty_tiocmset,
2027	.get_serial =		get_serial_info,
2028	.set_serial =		set_serial_info,
2029	.get_icount =		acm_tty_get_icount,
2030};
2031
2032/*
2033 * Init / exit.
2034 */
2035
2036static int __init acm_init(void)
2037{
2038	int retval;
2039	acm_tty_driver = tty_alloc_driver(ACM_TTY_MINORS, TTY_DRIVER_REAL_RAW |
2040			TTY_DRIVER_DYNAMIC_DEV);
2041	if (IS_ERR(acm_tty_driver))
2042		return PTR_ERR(acm_tty_driver);
2043	acm_tty_driver->driver_name = "acm",
2044	acm_tty_driver->name = "ttyACM",
2045	acm_tty_driver->major = ACM_TTY_MAJOR,
2046	acm_tty_driver->minor_start = 0,
2047	acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2048	acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
 
2049	acm_tty_driver->init_termios = tty_std_termios;
2050	acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2051								HUPCL | CLOCAL;
2052	tty_set_operations(acm_tty_driver, &acm_ops);
2053
2054	retval = tty_register_driver(acm_tty_driver);
2055	if (retval) {
2056		tty_driver_kref_put(acm_tty_driver);
2057		return retval;
2058	}
2059
2060	retval = usb_register(&acm_driver);
2061	if (retval) {
2062		tty_unregister_driver(acm_tty_driver);
2063		tty_driver_kref_put(acm_tty_driver);
2064		return retval;
2065	}
2066
2067	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2068
2069	return 0;
2070}
2071
2072static void __exit acm_exit(void)
2073{
2074	usb_deregister(&acm_driver);
2075	tty_unregister_driver(acm_tty_driver);
2076	tty_driver_kref_put(acm_tty_driver);
2077	idr_destroy(&acm_minors);
2078}
2079
2080module_init(acm_init);
2081module_exit(acm_exit);
2082
2083MODULE_AUTHOR(DRIVER_AUTHOR);
2084MODULE_DESCRIPTION(DRIVER_DESC);
2085MODULE_LICENSE("GPL");
2086MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);