1/*
   2 * cdc-acm.c
   3 *
   4 * Copyright (c) 1999 Armin Fuerst	<fuerst@in.tum.de>
   5 * Copyright (c) 1999 Pavel Machek	<pavel@ucw.cz>
   6 * Copyright (c) 1999 Johannes Erdfelt	<johannes@erdfelt.com>
   7 * Copyright (c) 2000 Vojtech Pavlik	<vojtech@suse.cz>
   8 * Copyright (c) 2004 Oliver Neukum	<oliver@neukum.name>
   9 * Copyright (c) 2005 David Kubicek	<dave@awk.cz>
  10 * Copyright (c) 2011 Johan Hovold	<jhovold@gmail.com>
  11 *
  12 * USB Abstract Control Model driver for USB modems and ISDN adapters
  13 *
  14 * Sponsored by SuSE
  15 *
  16 * This program is free software; you can redistribute it and/or modify
  17 * it under the terms of the GNU General Public License as published by
  18 * the Free Software Foundation; either version 2 of the License, or
  19 * (at your option) any later version.
  20 *
  21 * This program is distributed in the hope that it will be useful,
  22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 * GNU General Public License for more details.
  25 *
  26 * You should have received a copy of the GNU General Public License
  27 * along with this program; if not, write to the Free Software
  28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  29 */
  30
  31#undef DEBUG
  32#undef VERBOSE_DEBUG
  33
  34#include <linux/kernel.h>
 
  35#include <linux/errno.h>
  36#include <linux/init.h>
  37#include <linux/slab.h>
 
  38#include <linux/tty.h>
  39#include <linux/serial.h>
  40#include <linux/tty_driver.h>
  41#include <linux/tty_flip.h>
  42#include <linux/module.h>
  43#include <linux/mutex.h>
  44#include <linux/uaccess.h>
  45#include <linux/usb.h>
  46#include <linux/usb/cdc.h>
  47#include <asm/byteorder.h>
  48#include <asm/unaligned.h>
  49#include <linux/idr.h>
  50#include <linux/list.h>
  51
  52#include "cdc-acm.h"
  53
  54
  55#define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  56#define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  57
  58static struct usb_driver acm_driver;
  59static struct tty_driver *acm_tty_driver;
  60
  61static DEFINE_IDR(acm_minors);
  62static DEFINE_MUTEX(acm_minors_lock);
  63
  64static void acm_tty_set_termios(struct tty_struct *tty,
  65				struct ktermios *termios_old);
  66
  67/*
  68 * acm_minors accessors
  69 */
  70
  71/*
  72 * Look up an ACM structure by minor. If found and not disconnected, increment
  73 * its refcount and return it with its mutex held.
  74 */
  75static struct acm *acm_get_by_minor(unsigned int minor)
  76{
  77	struct acm *acm;
  78
  79	mutex_lock(&acm_minors_lock);
  80	acm = idr_find(&acm_minors, minor);
  81	if (acm) {
  82		mutex_lock(&acm->mutex);
  83		if (acm->disconnected) {
  84			mutex_unlock(&acm->mutex);
  85			acm = NULL;
  86		} else {
  87			tty_port_get(&acm->port);
  88			mutex_unlock(&acm->mutex);
  89		}
  90	}
  91	mutex_unlock(&acm_minors_lock);
  92	return acm;
  93}
  94
  95/*
  96 * Try to find an available minor number and if found, associate it with 'acm'.
  97 */
  98static int acm_alloc_minor(struct acm *acm)
  99{
 100	int minor;
 101
 102	mutex_lock(&acm_minors_lock);
 103	minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
 104	mutex_unlock(&acm_minors_lock);
 105
 106	return minor;
 107}
 108
 109/* Release the minor number associated with 'acm'.  */
 110static void acm_release_minor(struct acm *acm)
 111{
 112	mutex_lock(&acm_minors_lock);
 113	idr_remove(&acm_minors, acm->minor);
 114	mutex_unlock(&acm_minors_lock);
 115}
 116
 117/*
 118 * Functions for ACM control messages.
 119 */
 120
 121static int acm_ctrl_msg(struct acm *acm, int request, int value,
 122							void *buf, int len)
 123{
 124	int retval;
 125
 126	retval = usb_autopm_get_interface(acm->control);
 127	if (retval)
 128		return retval;
 129
 130	retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 131		request, USB_RT_ACM, value,
 132		acm->control->altsetting[0].desc.bInterfaceNumber,
 133		buf, len, 5000);
 134
 135	dev_dbg(&acm->control->dev,
 136		"%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 137		__func__, request, value, len, retval);
 138
 139	usb_autopm_put_interface(acm->control);
 140
 141	return retval < 0 ? retval : 0;
 142}
 143
 144/* devices aren't required to support these requests.
 145 * the cdc acm descriptor tells whether they do...
 146 */
 147static inline int acm_set_control(struct acm *acm, int control)
 148{
 149	if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
 150		return -EOPNOTSUPP;
 151
 152	return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
 153			control, NULL, 0);
 154}
 155
 156#define acm_set_line(acm, line) \
 157	acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 158#define acm_send_break(acm, ms) \
 159	acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 160
 161static void acm_kill_urbs(struct acm *acm)
 162{
 163	int i;
 164
 165	usb_kill_urb(acm->ctrlurb);
 166	for (i = 0; i < ACM_NW; i++)
 167		usb_kill_urb(acm->wb[i].urb);
 168	for (i = 0; i < acm->rx_buflimit; i++)
 169		usb_kill_urb(acm->read_urbs[i]);
 170}
 171
 172/*
 173 * Write buffer management.
 174 * All of these assume proper locks taken by the caller.
 175 */
 176
 177static int acm_wb_alloc(struct acm *acm)
 178{
 179	int i, wbn;
 180	struct acm_wb *wb;
 181
 182	wbn = 0;
 183	i = 0;
 184	for (;;) {
 185		wb = &acm->wb[wbn];
 186		if (!wb->use) {
 187			wb->use = 1;
 
 188			return wbn;
 189		}
 190		wbn = (wbn + 1) % ACM_NW;
 191		if (++i >= ACM_NW)
 192			return -1;
 193	}
 194}
 195
 196static int acm_wb_is_avail(struct acm *acm)
 197{
 198	int i, n;
 199	unsigned long flags;
 200
 201	n = ACM_NW;
 202	spin_lock_irqsave(&acm->write_lock, flags);
 203	for (i = 0; i < ACM_NW; i++)
 204		n -= acm->wb[i].use;
 205	spin_unlock_irqrestore(&acm->write_lock, flags);
 206	return n;
 207}
 208
 209/*
 210 * Finish write. Caller must hold acm->write_lock
 211 */
 212static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 213{
 214	wb->use = 0;
 215	acm->transmitting--;
 216	usb_autopm_put_interface_async(acm->control);
 217}
 218
 219/*
 220 * Poke write.
 221 *
 222 * the caller is responsible for locking
 223 */
 224
 225static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 226{
 227	int rc;
 228
 229	acm->transmitting++;
 230
 231	wb->urb->transfer_buffer = wb->buf;
 232	wb->urb->transfer_dma = wb->dmah;
 233	wb->urb->transfer_buffer_length = wb->len;
 234	wb->urb->dev = acm->dev;
 235
 236	rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 237	if (rc < 0) {
 238		dev_err(&acm->data->dev,
 239			"%s - usb_submit_urb(write bulk) failed: %d\n",
 240			__func__, rc);
 241		acm_write_done(acm, wb);
 242	}
 243	return rc;
 244}
 245
 246/*
 247 * attributes exported through sysfs
 248 */
 249static ssize_t show_caps
 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	return sprintf(buf, "%d", acm->ctrl_caps);
 256}
 257static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 258
 259static ssize_t show_country_codes
 260(struct device *dev, struct device_attribute *attr, char *buf)
 261{
 262	struct usb_interface *intf = to_usb_interface(dev);
 263	struct acm *acm = usb_get_intfdata(intf);
 264
 265	memcpy(buf, acm->country_codes, acm->country_code_size);
 266	return acm->country_code_size;
 267}
 268
 269static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 270
 271static ssize_t show_country_rel_date
 272(struct device *dev, struct device_attribute *attr, char *buf)
 273{
 274	struct usb_interface *intf = to_usb_interface(dev);
 275	struct acm *acm = usb_get_intfdata(intf);
 276
 277	return sprintf(buf, "%d", acm->country_rel_date);
 278}
 279
 280static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 281/*
 282 * Interrupt handlers for various ACM device responses
 283 */
 284
 285/* control interface reports status changes with "interrupt" transfers */
 286static void acm_ctrl_irq(struct urb *urb)
 287{
 288	struct acm *acm = urb->context;
 289	struct usb_cdc_notification *dr = urb->transfer_buffer;
 290	unsigned char *data;
 291	int newctrl;
 292	int difference;
 293	int retval;
 294	int status = urb->status;
 295
 296	switch (status) {
 297	case 0:
 298		/* success */
 299		break;
 300	case -ECONNRESET:
 301	case -ENOENT:
 302	case -ESHUTDOWN:
 303		/* this urb is terminated, clean up */
 304		dev_dbg(&acm->control->dev,
 305			"%s - urb shutting down with status: %d\n",
 306			__func__, status);
 307		return;
 308	default:
 309		dev_dbg(&acm->control->dev,
 310			"%s - nonzero urb status received: %d\n",
 311			__func__, status);
 312		goto exit;
 313	}
 314
 315	usb_mark_last_busy(acm->dev);
 316
 317	data = (unsigned char *)(dr + 1);
 318	switch (dr->bNotificationType) {
 319	case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 320		dev_dbg(&acm->control->dev,
 321			"%s - network connection: %d\n", __func__, dr->wValue);
 322		break;
 323
 324	case USB_CDC_NOTIFY_SERIAL_STATE:
 
 
 
 
 
 
 325		newctrl = get_unaligned_le16(data);
 
 
 326
 327		if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 328			dev_dbg(&acm->control->dev,
 329				"%s - calling hangup\n", __func__);
 330			tty_port_tty_hangup(&acm->port, false);
 331		}
 332
 333		difference = acm->ctrlin ^ newctrl;
 334		spin_lock(&acm->read_lock);
 335		acm->ctrlin = newctrl;
 336		acm->oldcount = acm->iocount;
 337
 338		if (difference & ACM_CTRL_DSR)
 339			acm->iocount.dsr++;
 340		if (difference & ACM_CTRL_BRK)
 341			acm->iocount.brk++;
 342		if (difference & ACM_CTRL_RI)
 343			acm->iocount.rng++;
 344		if (difference & ACM_CTRL_DCD)
 345			acm->iocount.dcd++;
 346		if (difference & ACM_CTRL_FRAMING)
 347			acm->iocount.frame++;
 348		if (difference & ACM_CTRL_PARITY)
 349			acm->iocount.parity++;
 350		if (difference & ACM_CTRL_OVERRUN)
 351			acm->iocount.overrun++;
 352		spin_unlock(&acm->read_lock);
 353
 354		if (difference)
 355			wake_up_all(&acm->wioctl);
 356
 357		break;
 358
 359	default:
 360		dev_dbg(&acm->control->dev,
 361			"%s - unknown notification %d received: index %d "
 362			"len %d data0 %d data1 %d\n",
 363			__func__,
 364			dr->bNotificationType, dr->wIndex,
 365			dr->wLength, data[0], data[1]);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 366		break;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 367	}
 
 
 
 
 
 
 
 368exit:
 369	retval = usb_submit_urb(urb, GFP_ATOMIC);
 370	if (retval && retval != -EPERM)
 371		dev_err(&acm->control->dev,
 372			"%s - usb_submit_urb failed: %d\n", __func__, retval);
 373}
 374
 375static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 376{
 377	int res;
 378
 379	if (!test_and_clear_bit(index, &acm->read_urbs_free))
 380		return 0;
 381
 382	res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 383	if (res) {
 384		if (res != -EPERM) {
 385			dev_err(&acm->data->dev,
 386				"urb %d failed submission with %d\n",
 387				index, res);
 388		}
 389		set_bit(index, &acm->read_urbs_free);
 390		return res;
 391	} else {
 392		dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 393	}
 394
 395	return 0;
 396}
 397
 398static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 399{
 400	int res;
 401	int i;
 402
 403	for (i = 0; i < acm->rx_buflimit; ++i) {
 404		res = acm_submit_read_urb(acm, i, mem_flags);
 405		if (res)
 406			return res;
 407	}
 408
 409	return 0;
 410}
 411
 412static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 413{
 414	if (!urb->actual_length)
 415		return;
 416
 417	tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 418			urb->actual_length);
 419	tty_flip_buffer_push(&acm->port);
 420}
 421
 422static void acm_read_bulk_callback(struct urb *urb)
 423{
 424	struct acm_rb *rb = urb->context;
 425	struct acm *acm = rb->instance;
 426	unsigned long flags;
 427	int status = urb->status;
 428
 429	dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 430		rb->index, urb->actual_length, status);
 431
 432	set_bit(rb->index, &acm->read_urbs_free);
 433
 434	if (!acm->dev) {
 435		dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 436		return;
 437	}
 438
 439	switch (status) {
 440	case 0:
 441		usb_mark_last_busy(acm->dev);
 442		acm_process_read_urb(acm, urb);
 443		break;
 444	case -EPIPE:
 445		set_bit(EVENT_RX_STALL, &acm->flags);
 446		schedule_work(&acm->work);
 447		return;
 448	case -ENOENT:
 449	case -ECONNRESET:
 450	case -ESHUTDOWN:
 451		dev_dbg(&acm->data->dev,
 452			"%s - urb shutting down with status: %d\n",
 453			__func__, status);
 454		return;
 455	default:
 456		dev_dbg(&acm->data->dev,
 457			"%s - nonzero urb status received: %d\n",
 458			__func__, status);
 459		break;
 460	}
 461
 462	/*
 463	 * Unthrottle may run on another CPU which needs to see events
 464	 * in the same order. Submission has an implict barrier
 465	 */
 466	smp_mb__before_atomic();
 467
 468	/* throttle device if requested by tty */
 469	spin_lock_irqsave(&acm->read_lock, flags);
 470	acm->throttled = acm->throttle_req;
 471	if (!acm->throttled) {
 472		spin_unlock_irqrestore(&acm->read_lock, flags);
 473		acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 474	} else {
 475		spin_unlock_irqrestore(&acm->read_lock, flags);
 476	}
 477}
 478
 479/* data interface wrote those outgoing bytes */
 480static void acm_write_bulk(struct urb *urb)
 481{
 482	struct acm_wb *wb = urb->context;
 483	struct acm *acm = wb->instance;
 484	unsigned long flags;
 485	int status = urb->status;
 486
 487	if (status || (urb->actual_length != urb->transfer_buffer_length))
 488		dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
 489			urb->actual_length,
 490			urb->transfer_buffer_length,
 491			status);
 492
 493	spin_lock_irqsave(&acm->write_lock, flags);
 494	acm_write_done(acm, wb);
 495	spin_unlock_irqrestore(&acm->write_lock, flags);
 496	set_bit(EVENT_TTY_WAKEUP, &acm->flags);
 497	schedule_work(&acm->work);
 498}
 499
 500static void acm_softint(struct work_struct *work)
 501{
 502	int i;
 503	struct acm *acm = container_of(work, struct acm, work);
 504
 505	if (test_bit(EVENT_RX_STALL, &acm->flags)) {
 506		if (!(usb_autopm_get_interface(acm->data))) {
 507			for (i = 0; i < acm->rx_buflimit; i++)
 508				usb_kill_urb(acm->read_urbs[i]);
 509			usb_clear_halt(acm->dev, acm->in);
 510			acm_submit_read_urbs(acm, GFP_KERNEL);
 511			usb_autopm_put_interface(acm->data);
 512		}
 513		clear_bit(EVENT_RX_STALL, &acm->flags);
 514	}
 515
 516	if (test_bit(EVENT_TTY_WAKEUP, &acm->flags)) {
 517		tty_port_tty_wakeup(&acm->port);
 518		clear_bit(EVENT_TTY_WAKEUP, &acm->flags);
 519	}
 520}
 521
 522/*
 523 * TTY handlers
 524 */
 525
 526static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 527{
 528	struct acm *acm;
 529	int retval;
 530
 531	acm = acm_get_by_minor(tty->index);
 532	if (!acm)
 533		return -ENODEV;
 534
 535	retval = tty_standard_install(driver, tty);
 536	if (retval)
 537		goto error_init_termios;
 538
 539	tty->driver_data = acm;
 540
 541	return 0;
 542
 543error_init_termios:
 544	tty_port_put(&acm->port);
 545	return retval;
 546}
 547
 548static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 549{
 550	struct acm *acm = tty->driver_data;
 551
 552	return tty_port_open(&acm->port, tty, filp);
 553}
 554
 555static void acm_port_dtr_rts(struct tty_port *port, int raise)
 556{
 557	struct acm *acm = container_of(port, struct acm, port);
 558	int val;
 559	int res;
 560
 561	if (raise)
 562		val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 563	else
 564		val = 0;
 565
 566	/* FIXME: add missing ctrlout locking throughout driver */
 567	acm->ctrlout = val;
 568
 569	res = acm_set_control(acm, val);
 570	if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 571		dev_err(&acm->control->dev, "failed to set dtr/rts\n");
 572}
 573
 574static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 575{
 576	struct acm *acm = container_of(port, struct acm, port);
 577	int retval = -ENODEV;
 578	int i;
 579
 580	mutex_lock(&acm->mutex);
 581	if (acm->disconnected)
 582		goto disconnected;
 583
 584	retval = usb_autopm_get_interface(acm->control);
 585	if (retval)
 586		goto error_get_interface;
 587
 588	/*
 589	 * FIXME: Why do we need this? Allocating 64K of physically contiguous
 590	 * memory is really nasty...
 591	 */
 592	set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 593	acm->control->needs_remote_wakeup = 1;
 594
 595	acm->ctrlurb->dev = acm->dev;
 596	retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 597	if (retval) {
 598		dev_err(&acm->control->dev,
 599			"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 600		goto error_submit_urb;
 601	}
 602
 603	acm_tty_set_termios(tty, NULL);
 604
 605	/*
 606	 * Unthrottle device in case the TTY was closed while throttled.
 607	 */
 608	spin_lock_irq(&acm->read_lock);
 609	acm->throttled = 0;
 610	acm->throttle_req = 0;
 611	spin_unlock_irq(&acm->read_lock);
 612
 613	retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 614	if (retval)
 615		goto error_submit_read_urbs;
 616
 617	usb_autopm_put_interface(acm->control);
 618
 619	mutex_unlock(&acm->mutex);
 620
 621	return 0;
 622
 623error_submit_read_urbs:
 624	for (i = 0; i < acm->rx_buflimit; i++)
 625		usb_kill_urb(acm->read_urbs[i]);
 626	usb_kill_urb(acm->ctrlurb);
 627error_submit_urb:
 628	usb_autopm_put_interface(acm->control);
 629error_get_interface:
 630disconnected:
 631	mutex_unlock(&acm->mutex);
 632
 633	return usb_translate_errors(retval);
 634}
 635
 636static void acm_port_destruct(struct tty_port *port)
 637{
 638	struct acm *acm = container_of(port, struct acm, port);
 639
 640	acm_release_minor(acm);
 641	usb_put_intf(acm->control);
 642	kfree(acm->country_codes);
 643	kfree(acm);
 644}
 645
 646static void acm_port_shutdown(struct tty_port *port)
 647{
 648	struct acm *acm = container_of(port, struct acm, port);
 649	struct urb *urb;
 650	struct acm_wb *wb;
 651
 652	/*
 653	 * Need to grab write_lock to prevent race with resume, but no need to
 654	 * hold it due to the tty-port initialised flag.
 655	 */
 656	spin_lock_irq(&acm->write_lock);
 657	spin_unlock_irq(&acm->write_lock);
 658
 659	usb_autopm_get_interface_no_resume(acm->control);
 660	acm->control->needs_remote_wakeup = 0;
 661	usb_autopm_put_interface(acm->control);
 662
 663	for (;;) {
 664		urb = usb_get_from_anchor(&acm->delayed);
 665		if (!urb)
 666			break;
 667		wb = urb->context;
 668		wb->use = 0;
 669		usb_autopm_put_interface_async(acm->control);
 670	}
 671
 672	acm_kill_urbs(acm);
 673}
 674
 675static void acm_tty_cleanup(struct tty_struct *tty)
 676{
 677	struct acm *acm = tty->driver_data;
 678
 679	tty_port_put(&acm->port);
 680}
 681
 682static void acm_tty_hangup(struct tty_struct *tty)
 683{
 684	struct acm *acm = tty->driver_data;
 685
 686	tty_port_hangup(&acm->port);
 687}
 688
 689static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 690{
 691	struct acm *acm = tty->driver_data;
 692
 693	tty_port_close(&acm->port, tty, filp);
 694}
 695
 696static int acm_tty_write(struct tty_struct *tty,
 697					const unsigned char *buf, int count)
 698{
 699	struct acm *acm = tty->driver_data;
 700	int stat;
 701	unsigned long flags;
 702	int wbn;
 703	struct acm_wb *wb;
 704
 705	if (!count)
 706		return 0;
 707
 708	dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
 709
 710	spin_lock_irqsave(&acm->write_lock, flags);
 711	wbn = acm_wb_alloc(acm);
 712	if (wbn < 0) {
 713		spin_unlock_irqrestore(&acm->write_lock, flags);
 714		return 0;
 715	}
 716	wb = &acm->wb[wbn];
 717
 718	if (!acm->dev) {
 719		wb->use = 0;
 720		spin_unlock_irqrestore(&acm->write_lock, flags);
 721		return -ENODEV;
 722	}
 723
 724	count = (count > acm->writesize) ? acm->writesize : count;
 725	dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
 726	memcpy(wb->buf, buf, count);
 727	wb->len = count;
 728
 729	stat = usb_autopm_get_interface_async(acm->control);
 730	if (stat) {
 731		wb->use = 0;
 732		spin_unlock_irqrestore(&acm->write_lock, flags);
 733		return stat;
 734	}
 735
 736	if (acm->susp_count) {
 737		if (acm->putbuffer) {
 738			/* now to preserve order */
 739			usb_anchor_urb(acm->putbuffer->urb, &acm->delayed);
 740			acm->putbuffer = NULL;
 741		}
 742		usb_anchor_urb(wb->urb, &acm->delayed);
 743		spin_unlock_irqrestore(&acm->write_lock, flags);
 744		return count;
 745	} else {
 746		if (acm->putbuffer) {
 747			/* at this point there is no good way to handle errors */
 748			acm_start_wb(acm, acm->putbuffer);
 749			acm->putbuffer = NULL;
 750		}
 751	}
 752
 753	stat = acm_start_wb(acm, wb);
 754	spin_unlock_irqrestore(&acm->write_lock, flags);
 755
 756	if (stat < 0)
 757		return stat;
 758	return count;
 759}
 760
 761static void acm_tty_flush_chars(struct tty_struct *tty)
 762{
 763	struct acm *acm = tty->driver_data;
 764	struct acm_wb *cur = acm->putbuffer;
 765	int err;
 766	unsigned long flags;
 767
 
 
 
 768	if (!cur) /* nothing to do */
 769		return;
 770
 771	acm->putbuffer = NULL;
 772	err = usb_autopm_get_interface_async(acm->control);
 773	spin_lock_irqsave(&acm->write_lock, flags);
 774	if (err < 0) {
 775		cur->use = 0;
 776		acm->putbuffer = cur;
 777		goto out;
 778	}
 779
 780	if (acm->susp_count)
 781		usb_anchor_urb(cur->urb, &acm->delayed);
 782	else
 783		acm_start_wb(acm, cur);
 784out:
 785	spin_unlock_irqrestore(&acm->write_lock, flags);
 786	return;
 787}
 788
 789static int acm_tty_put_char(struct tty_struct *tty, unsigned char ch)
 790{
 791	struct acm *acm = tty->driver_data;
 792	struct acm_wb *cur;
 793	int wbn;
 794	unsigned long flags;
 795
 796overflow:
 797	cur = acm->putbuffer;
 798	if (!cur) {
 799		spin_lock_irqsave(&acm->write_lock, flags);
 800		wbn = acm_wb_alloc(acm);
 801		if (wbn >= 0) {
 802			cur = &acm->wb[wbn];
 803			acm->putbuffer = cur;
 804		}
 805		spin_unlock_irqrestore(&acm->write_lock, flags);
 806		if (!cur)
 807			return 0;
 808	}
 809
 810	if (cur->len == acm->writesize) {
 811		acm_tty_flush_chars(tty);
 812		goto overflow;
 813	}
 814
 815	cur->buf[cur->len++] = ch;
 816	return 1;
 817}
 818
 819static int acm_tty_write_room(struct tty_struct *tty)
 820{
 821	struct acm *acm = tty->driver_data;
 822	/*
 823	 * Do not let the line discipline to know that we have a reserve,
 824	 * or it might get too enthusiastic.
 825	 */
 826	return acm_wb_is_avail(acm) ? acm->writesize : 0;
 827}
 828
 829static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 830{
 831	struct acm *acm = tty->driver_data;
 832	/*
 833	 * if the device was unplugged then any remaining characters fell out
 834	 * of the connector ;)
 835	 */
 836	if (acm->disconnected)
 837		return 0;
 838	/*
 839	 * This is inaccurate (overcounts), but it works.
 840	 */
 841	return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 842}
 843
 844static void acm_tty_throttle(struct tty_struct *tty)
 845{
 846	struct acm *acm = tty->driver_data;
 847
 848	spin_lock_irq(&acm->read_lock);
 849	acm->throttle_req = 1;
 850	spin_unlock_irq(&acm->read_lock);
 851}
 852
 853static void acm_tty_unthrottle(struct tty_struct *tty)
 854{
 855	struct acm *acm = tty->driver_data;
 856	unsigned int was_throttled;
 857
 858	spin_lock_irq(&acm->read_lock);
 859	was_throttled = acm->throttled;
 860	acm->throttled = 0;
 861	acm->throttle_req = 0;
 862	spin_unlock_irq(&acm->read_lock);
 863
 864	if (was_throttled)
 865		acm_submit_read_urbs(acm, GFP_KERNEL);
 866}
 867
 868static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 869{
 870	struct acm *acm = tty->driver_data;
 871	int retval;
 872
 873	retval = acm_send_break(acm, state ? 0xffff : 0);
 874	if (retval < 0)
 875		dev_dbg(&acm->control->dev,
 876			"%s - send break failed\n", __func__);
 877	return retval;
 878}
 879
 880static int acm_tty_tiocmget(struct tty_struct *tty)
 881{
 882	struct acm *acm = tty->driver_data;
 883
 884	return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 885	       (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 886	       (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 887	       (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 888	       (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 889	       TIOCM_CTS;
 890}
 891
 892static int acm_tty_tiocmset(struct tty_struct *tty,
 893			    unsigned int set, unsigned int clear)
 894{
 895	struct acm *acm = tty->driver_data;
 896	unsigned int newctrl;
 897
 898	newctrl = acm->ctrlout;
 899	set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 900					(set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 901	clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 902					(clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 903
 904	newctrl = (newctrl & ~clear) | set;
 905
 906	if (acm->ctrlout == newctrl)
 907		return 0;
 908	return acm_set_control(acm, acm->ctrlout = newctrl);
 909}
 910
 911static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 912{
 913	struct serial_struct tmp;
 914
 915	memset(&tmp, 0, sizeof(tmp));
 916	tmp.flags = ASYNC_LOW_LATENCY;
 917	tmp.xmit_fifo_size = acm->writesize;
 918	tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 919	tmp.close_delay	= acm->port.close_delay / 10;
 920	tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 921				ASYNC_CLOSING_WAIT_NONE :
 922				acm->port.closing_wait / 10;
 923
 924	if (copy_to_user(info, &tmp, sizeof(tmp)))
 925		return -EFAULT;
 926	else
 927		return 0;
 928}
 929
 930static int set_serial_info(struct acm *acm,
 931				struct serial_struct __user *newinfo)
 932{
 933	struct serial_struct new_serial;
 934	unsigned int closing_wait, close_delay;
 935	int retval = 0;
 936
 937	if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 938		return -EFAULT;
 939
 940	close_delay = new_serial.close_delay * 10;
 941	closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 942			ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 943
 944	mutex_lock(&acm->port.mutex);
 945
 946	if (!capable(CAP_SYS_ADMIN)) {
 947		if ((close_delay != acm->port.close_delay) ||
 948		    (closing_wait != acm->port.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 TIOCGSERIAL: /* gets serial port data */
1028		rv = get_serial_info(acm, (struct serial_struct __user *) arg);
1029		break;
1030	case TIOCSSERIAL:
1031		rv = set_serial_info(acm, (struct serial_struct __user *) arg);
1032		break;
1033	case TIOCMIWAIT:
1034		rv = usb_autopm_get_interface(acm->control);
1035		if (rv < 0) {
1036			rv = -EIO;
1037			break;
1038		}
1039		rv = wait_serial_change(acm, arg);
1040		usb_autopm_put_interface(acm->control);
1041		break;
1042	}
1043
1044	return rv;
1045}
1046
1047static void acm_tty_set_termios(struct tty_struct *tty,
1048						struct ktermios *termios_old)
1049{
1050	struct acm *acm = tty->driver_data;
1051	struct ktermios *termios = &tty->termios;
1052	struct usb_cdc_line_coding newline;
1053	int newctrl = acm->ctrlout;
1054
1055	newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1056	newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1057	newline.bParityType = termios->c_cflag & PARENB ?
1058				(termios->c_cflag & PARODD ? 1 : 2) +
1059				(termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1060	switch (termios->c_cflag & CSIZE) {
1061	case CS5:
1062		newline.bDataBits = 5;
1063		break;
1064	case CS6:
1065		newline.bDataBits = 6;
1066		break;
1067	case CS7:
1068		newline.bDataBits = 7;
1069		break;
1070	case CS8:
1071	default:
1072		newline.bDataBits = 8;
1073		break;
1074	}
1075	/* FIXME: Needs to clear unsupported bits in the termios */
1076	acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1077
1078	if (C_BAUD(tty) == B0) {
1079		newline.dwDTERate = acm->line.dwDTERate;
1080		newctrl &= ~ACM_CTRL_DTR;
1081	} else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1082		newctrl |=  ACM_CTRL_DTR;
1083	}
1084
1085	if (newctrl != acm->ctrlout)
1086		acm_set_control(acm, acm->ctrlout = newctrl);
1087
1088	if (memcmp(&acm->line, &newline, sizeof newline)) {
1089		memcpy(&acm->line, &newline, sizeof newline);
1090		dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1091			__func__,
1092			le32_to_cpu(newline.dwDTERate),
1093			newline.bCharFormat, newline.bParityType,
1094			newline.bDataBits);
1095		acm_set_line(acm, &acm->line);
1096	}
1097}
1098
1099static const struct tty_port_operations acm_port_ops = {
1100	.dtr_rts = acm_port_dtr_rts,
1101	.shutdown = acm_port_shutdown,
1102	.activate = acm_port_activate,
1103	.destruct = acm_port_destruct,
1104};
1105
1106/*
1107 * USB probe and disconnect routines.
1108 */
1109
1110/* Little helpers: write/read buffers free */
1111static void acm_write_buffers_free(struct acm *acm)
1112{
1113	int i;
1114	struct acm_wb *wb;
1115
1116	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1117		usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1118}
1119
1120static void acm_read_buffers_free(struct acm *acm)
1121{
1122	int i;
1123
1124	for (i = 0; i < acm->rx_buflimit; i++)
1125		usb_free_coherent(acm->dev, acm->readsize,
1126			  acm->read_buffers[i].base, acm->read_buffers[i].dma);
1127}
1128
1129/* Little helper: write buffers allocate */
1130static int acm_write_buffers_alloc(struct acm *acm)
1131{
1132	int i;
1133	struct acm_wb *wb;
1134
1135	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1136		wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1137		    &wb->dmah);
1138		if (!wb->buf) {
1139			while (i != 0) {
1140				--i;
1141				--wb;
1142				usb_free_coherent(acm->dev, acm->writesize,
1143				    wb->buf, wb->dmah);
1144			}
1145			return -ENOMEM;
1146		}
1147	}
1148	return 0;
1149}
1150
1151static int acm_probe(struct usb_interface *intf,
1152		     const struct usb_device_id *id)
1153{
1154	struct usb_cdc_union_desc *union_header = NULL;
1155	struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1156	unsigned char *buffer = intf->altsetting->extra;
1157	int buflen = intf->altsetting->extralen;
1158	struct usb_interface *control_interface;
1159	struct usb_interface *data_interface;
1160	struct usb_endpoint_descriptor *epctrl = NULL;
1161	struct usb_endpoint_descriptor *epread = NULL;
1162	struct usb_endpoint_descriptor *epwrite = NULL;
1163	struct usb_device *usb_dev = interface_to_usbdev(intf);
1164	struct usb_cdc_parsed_header h;
1165	struct acm *acm;
1166	int minor;
1167	int ctrlsize, readsize;
1168	u8 *buf;
1169	int call_intf_num = -1;
1170	int data_intf_num = -1;
1171	unsigned long quirks;
1172	int num_rx_buf;
1173	int i;
1174	int combined_interfaces = 0;
1175	struct device *tty_dev;
1176	int rv = -ENOMEM;
 
1177
1178	/* normal quirks */
1179	quirks = (unsigned long)id->driver_info;
1180
1181	if (quirks == IGNORE_DEVICE)
1182		return -ENODEV;
1183
1184	memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1185
1186	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1187
1188	/* handle quirks deadly to normal probing*/
1189	if (quirks == NO_UNION_NORMAL) {
1190		data_interface = usb_ifnum_to_if(usb_dev, 1);
1191		control_interface = usb_ifnum_to_if(usb_dev, 0);
1192		/* we would crash */
1193		if (!data_interface || !control_interface)
1194			return -ENODEV;
1195		goto skip_normal_probe;
1196	}
1197
1198	/* normal probing*/
1199	if (!buffer) {
1200		dev_err(&intf->dev, "Weird descriptor references\n");
1201		return -EINVAL;
1202	}
1203
1204	if (!intf->cur_altsetting)
1205		return -EINVAL;
1206
1207	if (!buflen) {
1208		if (intf->cur_altsetting->endpoint &&
1209				intf->cur_altsetting->endpoint->extralen &&
1210				intf->cur_altsetting->endpoint->extra) {
1211			dev_dbg(&intf->dev,
1212				"Seeking extra descriptors on endpoint\n");
1213			buflen = intf->cur_altsetting->endpoint->extralen;
1214			buffer = intf->cur_altsetting->endpoint->extra;
1215		} else {
1216			dev_err(&intf->dev,
1217				"Zero length descriptor references\n");
1218			return -EINVAL;
1219		}
1220	}
1221
1222	cdc_parse_cdc_header(&h, intf, buffer, buflen);
1223	union_header = h.usb_cdc_union_desc;
1224	cmgmd = h.usb_cdc_call_mgmt_descriptor;
1225	if (cmgmd)
1226		call_intf_num = cmgmd->bDataInterface;
1227
1228	if (!union_header) {
1229		if (call_intf_num > 0) {
1230			dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1231			/* quirks for Droids MuIn LCD */
1232			if (quirks & NO_DATA_INTERFACE) {
1233				data_interface = usb_ifnum_to_if(usb_dev, 0);
1234			} else {
1235				data_intf_num = call_intf_num;
1236				data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1237			}
1238			control_interface = intf;
1239		} else {
1240			if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1241				dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1242				return -ENODEV;
1243			} else {
1244				dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1245				combined_interfaces = 1;
1246				control_interface = data_interface = intf;
1247				goto look_for_collapsed_interface;
1248			}
1249		}
1250	} else {
1251		data_intf_num = union_header->bSlaveInterface0;
1252		control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1253		data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1254	}
1255
1256	if (!control_interface || !data_interface) {
1257		dev_dbg(&intf->dev, "no interfaces\n");
1258		return -ENODEV;
1259	}
1260	if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1261		return -ENODEV;
1262
1263	if (data_intf_num != call_intf_num)
1264		dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1265
1266	if (control_interface == data_interface) {
1267		/* some broken devices designed for windows work this way */
1268		dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1269		combined_interfaces = 1;
1270		/* a popular other OS doesn't use it */
1271		quirks |= NO_CAP_LINE;
1272		if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1273			dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1274			return -EINVAL;
1275		}
1276look_for_collapsed_interface:
1277		for (i = 0; i < 3; i++) {
1278			struct usb_endpoint_descriptor *ep;
1279			ep = &data_interface->cur_altsetting->endpoint[i].desc;
1280
1281			if (usb_endpoint_is_int_in(ep))
1282				epctrl = ep;
1283			else if (usb_endpoint_is_bulk_out(ep))
1284				epwrite = ep;
1285			else if (usb_endpoint_is_bulk_in(ep))
1286				epread = ep;
1287			else
1288				return -EINVAL;
1289		}
1290		if (!epctrl || !epread || !epwrite)
1291			return -ENODEV;
1292		else
1293			goto made_compressed_probe;
1294	}
1295
1296skip_normal_probe:
1297
1298	/*workaround for switched interfaces */
1299	if (data_interface->cur_altsetting->desc.bInterfaceClass
1300						!= CDC_DATA_INTERFACE_TYPE) {
1301		if (control_interface->cur_altsetting->desc.bInterfaceClass
1302						== CDC_DATA_INTERFACE_TYPE) {
1303			dev_dbg(&intf->dev,
1304				"Your device has switched interfaces.\n");
1305			swap(control_interface, data_interface);
1306		} else {
1307			return -EINVAL;
1308		}
1309	}
1310
1311	/* Accept probe requests only for the control interface */
1312	if (!combined_interfaces && intf != control_interface)
1313		return -ENODEV;
1314
1315	if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1316		/* valid in this context */
1317		dev_dbg(&intf->dev, "The data interface isn't available\n");
1318		return -EBUSY;
1319	}
1320
1321
1322	if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1323	    control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1324		return -EINVAL;
1325
1326	epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1327	epread = &data_interface->cur_altsetting->endpoint[0].desc;
1328	epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1329
1330
1331	/* workaround for switched endpoints */
1332	if (!usb_endpoint_dir_in(epread)) {
1333		/* descriptors are swapped */
1334		dev_dbg(&intf->dev,
1335			"The data interface has switched endpoints\n");
1336		swap(epread, epwrite);
1337	}
1338made_compressed_probe:
1339	dev_dbg(&intf->dev, "interfaces are valid\n");
1340
1341	acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1342	if (acm == NULL)
1343		goto alloc_fail;
1344
1345	minor = acm_alloc_minor(acm);
1346	if (minor < 0)
1347		goto alloc_fail1;
1348
1349	ctrlsize = usb_endpoint_maxp(epctrl);
1350	readsize = usb_endpoint_maxp(epread) *
1351				(quirks == SINGLE_RX_URB ? 1 : 2);
1352	acm->combined_interfaces = combined_interfaces;
1353	acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1354	acm->control = control_interface;
1355	acm->data = data_interface;
1356	acm->minor = minor;
1357	acm->dev = usb_dev;
1358	if (h.usb_cdc_acm_descriptor)
1359		acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1360	if (quirks & NO_CAP_LINE)
1361		acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1362	acm->ctrlsize = ctrlsize;
1363	acm->readsize = readsize;
1364	acm->rx_buflimit = num_rx_buf;
1365	INIT_WORK(&acm->work, acm_softint);
1366	init_waitqueue_head(&acm->wioctl);
1367	spin_lock_init(&acm->write_lock);
1368	spin_lock_init(&acm->read_lock);
1369	mutex_init(&acm->mutex);
1370	if (usb_endpoint_xfer_int(epread)) {
1371		acm->bInterval = epread->bInterval;
1372		acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1373	} else {
1374		acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1375	}
1376	if (usb_endpoint_xfer_int(epwrite))
1377		acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1378	else
1379		acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1380	tty_port_init(&acm->port);
1381	acm->port.ops = &acm_port_ops;
1382	init_usb_anchor(&acm->delayed);
1383	acm->quirks = quirks;
1384
1385	buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1386	if (!buf)
1387		goto alloc_fail2;
1388	acm->ctrl_buffer = buf;
1389
1390	if (acm_write_buffers_alloc(acm) < 0)
1391		goto alloc_fail4;
1392
1393	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1394	if (!acm->ctrlurb)
1395		goto alloc_fail5;
1396
1397	for (i = 0; i < num_rx_buf; i++) {
1398		struct acm_rb *rb = &(acm->read_buffers[i]);
1399		struct urb *urb;
1400
1401		rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1402								&rb->dma);
1403		if (!rb->base)
1404			goto alloc_fail6;
1405		rb->index = i;
1406		rb->instance = acm;
1407
1408		urb = usb_alloc_urb(0, GFP_KERNEL);
1409		if (!urb)
1410			goto alloc_fail6;
1411
1412		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1413		urb->transfer_dma = rb->dma;
1414		if (usb_endpoint_xfer_int(epread))
1415			usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1416					 acm->readsize,
1417					 acm_read_bulk_callback, rb,
1418					 acm->bInterval);
1419		else
1420			usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1421					  acm->readsize,
1422					  acm_read_bulk_callback, rb);
1423
1424		acm->read_urbs[i] = urb;
1425		__set_bit(i, &acm->read_urbs_free);
1426	}
1427	for (i = 0; i < ACM_NW; i++) {
1428		struct acm_wb *snd = &(acm->wb[i]);
1429
1430		snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1431		if (snd->urb == NULL)
1432			goto alloc_fail7;
1433
1434		if (usb_endpoint_xfer_int(epwrite))
1435			usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1436				NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1437		else
1438			usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1439				NULL, acm->writesize, acm_write_bulk, snd);
1440		snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1441		if (quirks & SEND_ZERO_PACKET)
1442			snd->urb->transfer_flags |= URB_ZERO_PACKET;
1443		snd->instance = acm;
1444	}
1445
1446	usb_set_intfdata(intf, acm);
1447
1448	i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1449	if (i < 0)
1450		goto alloc_fail7;
1451
1452	if (h.usb_cdc_country_functional_desc) { /* export the country data */
1453		struct usb_cdc_country_functional_desc * cfd =
1454					h.usb_cdc_country_functional_desc;
1455
1456		acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1457		if (!acm->country_codes)
1458			goto skip_countries;
1459		acm->country_code_size = cfd->bLength - 4;
1460		memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1461							cfd->bLength - 4);
1462		acm->country_rel_date = cfd->iCountryCodeRelDate;
1463
1464		i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1465		if (i < 0) {
1466			kfree(acm->country_codes);
1467			acm->country_codes = NULL;
1468			acm->country_code_size = 0;
1469			goto skip_countries;
1470		}
1471
1472		i = device_create_file(&intf->dev,
1473						&dev_attr_iCountryCodeRelDate);
1474		if (i < 0) {
1475			device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1476			kfree(acm->country_codes);
1477			acm->country_codes = NULL;
1478			acm->country_code_size = 0;
1479			goto skip_countries;
1480		}
1481	}
1482
1483skip_countries:
1484	usb_fill_int_urb(acm->ctrlurb, usb_dev,
1485			 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1486			 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1487			 /* works around buggy devices */
1488			 epctrl->bInterval ? epctrl->bInterval : 16);
1489	acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1490	acm->ctrlurb->transfer_dma = acm->ctrl_dma;
 
 
 
1491
1492	dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1493
1494	acm->line.dwDTERate = cpu_to_le32(9600);
1495	acm->line.bDataBits = 8;
1496	acm_set_line(acm, &acm->line);
1497
1498	usb_driver_claim_interface(&acm_driver, data_interface, acm);
1499	usb_set_intfdata(data_interface, acm);
1500
1501	usb_get_intf(control_interface);
1502	tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1503			&control_interface->dev);
1504	if (IS_ERR(tty_dev)) {
1505		rv = PTR_ERR(tty_dev);
1506		goto alloc_fail8;
1507	}
1508
1509	if (quirks & CLEAR_HALT_CONDITIONS) {
1510		usb_clear_halt(usb_dev, acm->in);
1511		usb_clear_halt(usb_dev, acm->out);
1512	}
1513
1514	return 0;
1515alloc_fail8:
1516	if (acm->country_codes) {
1517		device_remove_file(&acm->control->dev,
1518				&dev_attr_wCountryCodes);
1519		device_remove_file(&acm->control->dev,
1520				&dev_attr_iCountryCodeRelDate);
1521		kfree(acm->country_codes);
1522	}
1523	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1524alloc_fail7:
1525	usb_set_intfdata(intf, NULL);
1526	for (i = 0; i < ACM_NW; i++)
1527		usb_free_urb(acm->wb[i].urb);
1528alloc_fail6:
1529	for (i = 0; i < num_rx_buf; i++)
1530		usb_free_urb(acm->read_urbs[i]);
1531	acm_read_buffers_free(acm);
1532	usb_free_urb(acm->ctrlurb);
1533alloc_fail5:
1534	acm_write_buffers_free(acm);
1535alloc_fail4:
1536	usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1537alloc_fail2:
1538	acm_release_minor(acm);
1539alloc_fail1:
1540	kfree(acm);
1541alloc_fail:
1542	return rv;
1543}
1544
1545static void acm_disconnect(struct usb_interface *intf)
1546{
1547	struct acm *acm = usb_get_intfdata(intf);
1548	struct tty_struct *tty;
1549
1550	/* sibling interface is already cleaning up */
1551	if (!acm)
1552		return;
1553
1554	mutex_lock(&acm->mutex);
1555	acm->disconnected = true;
1556	if (acm->country_codes) {
1557		device_remove_file(&acm->control->dev,
1558				&dev_attr_wCountryCodes);
1559		device_remove_file(&acm->control->dev,
1560				&dev_attr_iCountryCodeRelDate);
1561	}
1562	wake_up_all(&acm->wioctl);
1563	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1564	usb_set_intfdata(acm->control, NULL);
1565	usb_set_intfdata(acm->data, NULL);
1566	mutex_unlock(&acm->mutex);
1567
1568	tty = tty_port_tty_get(&acm->port);
1569	if (tty) {
1570		tty_vhangup(tty);
1571		tty_kref_put(tty);
1572	}
1573
1574	acm_kill_urbs(acm);
1575	cancel_work_sync(&acm->work);
1576
1577	tty_unregister_device(acm_tty_driver, acm->minor);
1578
1579	acm_write_buffers_free(acm);
1580	usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1581	acm_read_buffers_free(acm);
1582
 
 
1583	if (!acm->combined_interfaces)
1584		usb_driver_release_interface(&acm_driver, intf == acm->control ?
1585					acm->data : acm->control);
1586
1587	tty_port_put(&acm->port);
1588}
1589
1590#ifdef CONFIG_PM
1591static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1592{
1593	struct acm *acm = usb_get_intfdata(intf);
1594	int cnt;
1595
1596	spin_lock_irq(&acm->write_lock);
1597	if (PMSG_IS_AUTO(message)) {
1598		if (acm->transmitting) {
1599			spin_unlock_irq(&acm->write_lock);
1600			return -EBUSY;
1601		}
1602	}
1603	cnt = acm->susp_count++;
1604	spin_unlock_irq(&acm->write_lock);
1605
1606	if (cnt)
1607		return 0;
1608
1609	acm_kill_urbs(acm);
1610	cancel_work_sync(&acm->work);
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
1670	return 0;
1671}
1672
1673#define NOKIA_PCSUITE_ACM_INFO(x) \
1674		USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1675		USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1676		USB_CDC_ACM_PROTO_VENDOR)
1677
1678#define SAMSUNG_PCSUITE_ACM_INFO(x) \
1679		USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1680		USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1681		USB_CDC_ACM_PROTO_VENDOR)
1682
1683/*
1684 * USB driver structure.
1685 */
1686
1687static const struct usb_device_id acm_ids[] = {
1688	/* quirky and broken devices */
1689	{ USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1690	.driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1691	{ USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1692	.driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1693	{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1694	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1695	},
1696	{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1697	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1698	},
1699	{ USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1700	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1701	},
1702	{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1703	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1704	},
1705	{ USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1706	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1707	},
1708	{ USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1709	.driver_info = SINGLE_RX_URB,
1710	},
1711	{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1712	.driver_info = SINGLE_RX_URB, /* firmware bug */
1713	},
1714	{ USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1715	.driver_info = SINGLE_RX_URB, /* firmware bug */
1716	},
 
 
 
1717	{ USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1718	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1719	},
1720	{ USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1721	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1722	},
1723	{ USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1724	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1725	},
1726	{ USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1727	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1728	},
1729	{ USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1730	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1731	},
1732	{ USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1733	.driver_info = QUIRK_CONTROL_LINE_STATE, },
1734	{ USB_DEVICE(0x2184, 0x001c) },	/* GW Instek AFG-2225 */
1735	{ USB_DEVICE(0x2184, 0x0036) },	/* GW Instek AFG-125 */
1736	{ USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1737	},
1738	/* Motorola H24 HSPA module: */
1739	{ USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1740	{ USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1741	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1742	},
1743	{ USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1744	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1745	},
1746	{ USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1747	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1748	},
1749	{ USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1750	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1751	},
1752	{ USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1753	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1754	},
1755	{ USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1756	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1757	},
1758	{ USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1759	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1760	},
1761
1762	{ USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1763	.driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1764					   data interface instead of
1765					   communications interface.
1766					   Maybe we should define a new
1767					   quirk for this. */
1768	},
1769	{ USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1770	.driver_info = NO_UNION_NORMAL,
1771	},
1772	{ USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1773	.driver_info = NO_UNION_NORMAL,
1774	},
1775	{ USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1776	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1777	},
1778	{ USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1779	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
 
 
 
 
 
 
1780	},
1781
1782	{ USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1783	.driver_info = CLEAR_HALT_CONDITIONS,
1784	},
1785
1786	/* Nokia S60 phones expose two ACM channels. The first is
1787	 * a modem and is picked up by the standard AT-command
1788	 * information below. The second is 'vendor-specific' but
1789	 * is treated as a serial device at the S60 end, so we want
1790	 * to expose it on Linux too. */
1791	{ NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1792	{ NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1793	{ NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1794	{ NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1795	{ NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1796	{ NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1797	{ NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1798	{ NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1799	{ NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1800	{ NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1801	{ NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1802	{ NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1803	{ NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1804	{ NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1805	{ NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1806	{ NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1807	{ NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1808	{ NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1809	{ NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1810	{ NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1811	{ NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1812	{ NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1813	{ NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1814	{ NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1815	{ NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1816	{ NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1817	{ NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1818	{ NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1819	{ NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1820	{ NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1821	{ NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1822	{ NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1823	{ NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1824	{ NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1825	{ NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1826	{ NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1827	{ NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1828	{ NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1829	{ NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1830	{ NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1831	{ NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1832	{ NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1833	{ NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1834	{ NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1835	{ NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1836	{ NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1837	{ NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1838	{ NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1839	{ NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1840	{ NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1841	{ NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1842	{ NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1843	{ NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1844	{ NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1845	{ NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1846	{ NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1847	{ NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1848	{ SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1849
1850	/* Support for Owen devices */
1851	{ USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1852
1853	/* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1854
1855	/* Support for Droids MuIn LCD */
1856	{ USB_DEVICE(0x04d8, 0x000b),
1857	.driver_info = NO_DATA_INTERFACE,
1858	},
1859
1860#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1861	{ USB_DEVICE(0x04d8, 0x0082),	/* Application mode */
1862	.driver_info = IGNORE_DEVICE,
1863	},
1864	{ USB_DEVICE(0x04d8, 0x0083),	/* Bootloader mode */
1865	.driver_info = IGNORE_DEVICE,
1866	},
1867#endif
1868
1869	/*Samsung phone in firmware update mode */
1870	{ USB_DEVICE(0x04e8, 0x685d),
1871	.driver_info = IGNORE_DEVICE,
1872	},
1873
1874	/* Exclude Infineon Flash Loader utility */
1875	{ USB_DEVICE(0x058b, 0x0041),
1876	.driver_info = IGNORE_DEVICE,
1877	},
1878
1879	/* control interfaces without any protocol set */
1880	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1881		USB_CDC_PROTO_NONE) },
1882
1883	/* control interfaces with various AT-command sets */
1884	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1885		USB_CDC_ACM_PROTO_AT_V25TER) },
1886	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1887		USB_CDC_ACM_PROTO_AT_PCCA101) },
1888	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1889		USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1890	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1891		USB_CDC_ACM_PROTO_AT_GSM) },
1892	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1893		USB_CDC_ACM_PROTO_AT_3G) },
1894	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1895		USB_CDC_ACM_PROTO_AT_CDMA) },
1896
1897	{ USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1898	.driver_info = SEND_ZERO_PACKET,
1899	},
1900
1901	{ }
1902};
1903
1904MODULE_DEVICE_TABLE(usb, acm_ids);
1905
1906static struct usb_driver acm_driver = {
1907	.name =		"cdc_acm",
1908	.probe =	acm_probe,
1909	.disconnect =	acm_disconnect,
1910#ifdef CONFIG_PM
1911	.suspend =	acm_suspend,
1912	.resume =	acm_resume,
1913	.reset_resume =	acm_reset_resume,
1914#endif
1915	.pre_reset =	acm_pre_reset,
1916	.id_table =	acm_ids,
1917#ifdef CONFIG_PM
1918	.supports_autosuspend = 1,
1919#endif
1920	.disable_hub_initiated_lpm = 1,
1921};
1922
1923/*
1924 * TTY driver structures.
1925 */
1926
1927static const struct tty_operations acm_ops = {
1928	.install =		acm_tty_install,
1929	.open =			acm_tty_open,
1930	.close =		acm_tty_close,
1931	.cleanup =		acm_tty_cleanup,
1932	.hangup =		acm_tty_hangup,
1933	.write =		acm_tty_write,
1934	.put_char =		acm_tty_put_char,
1935	.flush_chars =		acm_tty_flush_chars,
1936	.write_room =		acm_tty_write_room,
1937	.ioctl =		acm_tty_ioctl,
1938	.throttle =		acm_tty_throttle,
1939	.unthrottle =		acm_tty_unthrottle,
1940	.chars_in_buffer =	acm_tty_chars_in_buffer,
1941	.break_ctl =		acm_tty_break_ctl,
1942	.set_termios =		acm_tty_set_termios,
1943	.tiocmget =		acm_tty_tiocmget,
1944	.tiocmset =		acm_tty_tiocmset,
1945	.get_icount =		acm_tty_get_icount,
1946};
1947
1948/*
1949 * Init / exit.
1950 */
1951
1952static int __init acm_init(void)
1953{
1954	int retval;
1955	acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1956	if (!acm_tty_driver)
1957		return -ENOMEM;
1958	acm_tty_driver->driver_name = "acm",
1959	acm_tty_driver->name = "ttyACM",
1960	acm_tty_driver->major = ACM_TTY_MAJOR,
1961	acm_tty_driver->minor_start = 0,
1962	acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1963	acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1964	acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1965	acm_tty_driver->init_termios = tty_std_termios;
1966	acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1967								HUPCL | CLOCAL;
1968	tty_set_operations(acm_tty_driver, &acm_ops);
1969
1970	retval = tty_register_driver(acm_tty_driver);
1971	if (retval) {
1972		put_tty_driver(acm_tty_driver);
1973		return retval;
1974	}
1975
1976	retval = usb_register(&acm_driver);
1977	if (retval) {
1978		tty_unregister_driver(acm_tty_driver);
1979		put_tty_driver(acm_tty_driver);
1980		return retval;
1981	}
1982
1983	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1984
1985	return 0;
1986}
1987
1988static void __exit acm_exit(void)
1989{
1990	usb_deregister(&acm_driver);
1991	tty_unregister_driver(acm_tty_driver);
1992	put_tty_driver(acm_tty_driver);
1993	idr_destroy(&acm_minors);
1994}
1995
1996module_init(acm_init);
1997module_exit(acm_exit);
1998
1999MODULE_AUTHOR(DRIVER_AUTHOR);
2000MODULE_DESCRIPTION(DRIVER_DESC);
2001MODULE_LICENSE("GPL");
2002MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);