drivers/usb/class/cdc-acm.c

   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
  47 static struct usb_driver acm_driver;
  48 static struct tty_driver *acm_tty_driver;
  49
  50 static DEFINE_IDR(acm_minors);
  51 static DEFINE_MUTEX(acm_minors_lock);
  52
  53 static void acm_tty_set_termios(struct tty_struct *tty,
  54                                 struct ktermios *termios_old);
  55
  56 /*
  57  * acm_minors accessors
  58  */
  59
  60 /*
  61  * Look up an ACM structure by minor. If found and not disconnected, increment
  62  * its refcount and return it with its mutex held.
  63  */
  64 static 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  */
  87 static 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'.  */
  99 static 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
 110 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 111                                                         void *buf, int len)
 112 {
 113         int retval;
 114
 115         retval = usb_autopm_get_interface(acm->control);
 116         if (retval)
 117                 return retval;
 118
 119         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 120                 request, USB_RT_ACM, value,
 121                 acm->control->altsetting[0].desc.bInterfaceNumber,
 122                 buf, len, 5000);
 123
 124         dev_dbg(&acm->control->dev,
 125                 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 126                 __func__, request, value, len, retval);
 127
 128         usb_autopm_put_interface(acm->control);
 129
 130         return retval < 0 ? retval : 0;
 131 }
 132
 133 /* devices aren't required to support these requests.
 134  * the cdc acm descriptor tells whether they do...
 135  */
 136 static 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
 150 static void acm_kill_urbs(struct acm *acm)
 151 {
 152         int i;
 153
 154         usb_kill_urb(acm->ctrlurb);
 155         for (i = 0; i < ACM_NW; i++)
 156                 usb_kill_urb(acm->wb[i].urb);
 157         for (i = 0; i < acm->rx_buflimit; i++)
 158                 usb_kill_urb(acm->read_urbs[i]);
 159 }
 160
 161 /*
 162  * Write buffer management.
 163  * All of these assume proper locks taken by the caller.
 164  */
 165
 166 static int acm_wb_alloc(struct acm *acm)
 167 {
 168         int i, wbn;
 169         struct acm_wb *wb;
 170
 171         wbn = 0;
 172         i = 0;
 173         for (;;) {
 174                 wb = &acm->wb[wbn];
 175                 if (!wb->use) {
 176                         wb->use = true;
 177                         wb->len = 0;
 178                         return wbn;
 179                 }
 180                 wbn = (wbn + 1) % ACM_NW;
 181                 if (++i >= ACM_NW)
 182                         return -1;
 183         }
 184 }
 185
 186 static int acm_wb_is_avail(struct acm *acm)
 187 {
 188         int i, n;
 189         unsigned long flags;
 190
 191         n = ACM_NW;
 192         spin_lock_irqsave(&acm->write_lock, flags);
 193         for (i = 0; i < ACM_NW; i++)
 194                 if(acm->wb[i].use)
 195                         n--;
 196         spin_unlock_irqrestore(&acm->write_lock, flags);
 197         return n;
 198 }
 199
 200 /*
 201  * Finish write. Caller must hold acm->write_lock
 202  */
 203 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 204 {
 205         wb->use = false;
 206         acm->transmitting--;
 207         usb_autopm_put_interface_async(acm->control);
 208 }
 209
 210 /*
 211  * Poke write.
 212  *
 213  * the caller is responsible for locking
 214  */
 215
 216 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 217 {
 218         int rc;
 219
 220         acm->transmitting++;
 221
 222         wb->urb->transfer_buffer = wb->buf;
 223         wb->urb->transfer_dma = wb->dmah;
 224         wb->urb->transfer_buffer_length = wb->len;
 225         wb->urb->dev = acm->dev;
 226
 227         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 228         if (rc < 0) {
 229                 dev_err(&acm->data->dev,
 230                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 231                         __func__, rc);
 232                 acm_write_done(acm, wb);
 233         }
 234         return rc;
 235 }
 236
 237 /*
 238  * attributes exported through sysfs
 239  */
 240 static ssize_t bmCapabilities_show
 241 (struct device *dev, struct device_attribute *attr, char *buf)
 242 {
 243         struct usb_interface *intf = to_usb_interface(dev);
 244         struct acm *acm = usb_get_intfdata(intf);
 245
 246         return sprintf(buf, "%d", acm->ctrl_caps);
 247 }
 248 static DEVICE_ATTR_RO(bmCapabilities);
 249
 250 static ssize_t wCountryCodes_show
 251 (struct device *dev, struct device_attribute *attr, char *buf)
 252 {
 253         struct usb_interface *intf = to_usb_interface(dev);
 254         struct acm *acm = usb_get_intfdata(intf);
 255
 256         memcpy(buf, acm->country_codes, acm->country_code_size);
 257         return acm->country_code_size;
 258 }
 259
 260 static DEVICE_ATTR_RO(wCountryCodes);
 261
 262 static ssize_t iCountryCodeRelDate_show
 263 (struct device *dev, struct device_attribute *attr, char *buf)
 264 {
 265         struct usb_interface *intf = to_usb_interface(dev);
 266         struct acm *acm = usb_get_intfdata(intf);
 267
 268         return sprintf(buf, "%d", acm->country_rel_date);
 269 }
 270
 271 static DEVICE_ATTR_RO(iCountryCodeRelDate);
 272 /*
 273  * Interrupt handlers for various ACM device responses
 274  */
 275
 276 static void acm_process_notification(struct acm *acm, unsigned char *buf)
 277 {
 278         int newctrl;
 279         int difference;
 280         unsigned long flags;
 281         struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
 282         unsigned char *data = buf + sizeof(struct usb_cdc_notification);
 283
 284         switch (dr->bNotificationType) {
 285         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 286                 dev_dbg(&acm->control->dev,
 287                         "%s - network connection: %d\n", __func__, dr->wValue);
 288                 break;
 289
 290         case USB_CDC_NOTIFY_SERIAL_STATE:
 291                 if (le16_to_cpu(dr->wLength) != 2) {
 292                         dev_dbg(&acm->control->dev,
 293                                 "%s - malformed serial state\n", __func__);
 294                         break;
 295                 }
 296
 297                 newctrl = get_unaligned_le16(data);
 298                 dev_dbg(&acm->control->dev,
 299                         "%s - serial state: 0x%x\n", __func__, newctrl);
 300
 301                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 302                         dev_dbg(&acm->control->dev,
 303                                 "%s - calling hangup\n", __func__);
 304                         tty_port_tty_hangup(&acm->port, false);
 305                 }
 306
 307                 difference = acm->ctrlin ^ newctrl;
 308                 spin_lock_irqsave(&acm->read_lock, flags);
 309                 acm->ctrlin = newctrl;
 310                 acm->oldcount = acm->iocount;
 311
 312                 if (difference & ACM_CTRL_DSR)
 313                         acm->iocount.dsr++;
 314                 if (difference & ACM_CTRL_DCD)
 315                         acm->iocount.dcd++;
 316                 if (newctrl & ACM_CTRL_BRK)
 317                         acm->iocount.brk++;
 318                 if (newctrl & ACM_CTRL_RI)
 319                         acm->iocount.rng++;
 320                 if (newctrl & ACM_CTRL_FRAMING)
 321                         acm->iocount.frame++;
 322                 if (newctrl & ACM_CTRL_PARITY)
 323                         acm->iocount.parity++;
 324                 if (newctrl & ACM_CTRL_OVERRUN)
 325                         acm->iocount.overrun++;
 326                 spin_unlock_irqrestore(&acm->read_lock, flags);
 327
 328                 if (difference)
 329                         wake_up_all(&acm->wioctl);
 330
 331                 break;
 332
 333         default:
 334                 dev_dbg(&acm->control->dev,
 335                         "%s - unknown notification %d received: index %d len %d\n",
 336                         __func__,
 337                         dr->bNotificationType, dr->wIndex, dr->wLength);
 338         }
 339 }
 340
 341 /* control interface reports status changes with "interrupt" transfers */
 342 static void acm_ctrl_irq(struct urb *urb)
 343 {
 344         struct acm *acm = urb->context;
 345         struct usb_cdc_notification *dr = urb->transfer_buffer;
 346         unsigned int current_size = urb->actual_length;
 347         unsigned int expected_size, copy_size, alloc_size;
 348         int retval;
 349         int status = urb->status;
 350
 351         switch (status) {
 352         case 0:
 353                 /* success */
 354                 break;
 355         case -ECONNRESET:
 356         case -ENOENT:
 357         case -ESHUTDOWN:
 358                 /* this urb is terminated, clean up */
 359                 dev_dbg(&acm->control->dev,
 360                         "%s - urb shutting down with status: %d\n",
 361                         __func__, status);
 362                 return;
 363         default:
 364                 dev_dbg(&acm->control->dev,
 365                         "%s - nonzero urb status received: %d\n",
 366                         __func__, status);
 367                 goto exit;
 368         }
 369
 370         usb_mark_last_busy(acm->dev);
 371
 372         if (acm->nb_index)
 373                 dr = (struct usb_cdc_notification *)acm->notification_buffer;
 374
 375         /* size = notification-header + (optional) data */
 376         expected_size = sizeof(struct usb_cdc_notification) +
 377                                         le16_to_cpu(dr->wLength);
 378
 379         if (current_size < expected_size) {
 380                 /* notification is transmitted fragmented, reassemble */
 381                 if (acm->nb_size < expected_size) {
 382                         u8 *new_buffer;
 383                         alloc_size = roundup_pow_of_two(expected_size);
 384                         /* Final freeing is done on disconnect. */
 385                         new_buffer = krealloc(acm->notification_buffer,
 386                                               alloc_size, GFP_ATOMIC);
 387                         if (!new_buffer) {
 388                                 acm->nb_index = 0;
 389                                 goto exit;
 390                         }
 391
 392                         acm->notification_buffer = new_buffer;
 393                         acm->nb_size = alloc_size;
 394                         dr = (struct usb_cdc_notification *)acm->notification_buffer;
 395                 }
 396
 397                 copy_size = min(current_size,
 398                                 expected_size - acm->nb_index);
 399
 400                 memcpy(&acm->notification_buffer[acm->nb_index],
 401                        urb->transfer_buffer, copy_size);
 402                 acm->nb_index += copy_size;
 403                 current_size = acm->nb_index;
 404         }
 405
 406         if (current_size >= expected_size) {
 407                 /* notification complete */
 408                 acm_process_notification(acm, (unsigned char *)dr);
 409                 acm->nb_index = 0;
 410         }
 411
 412 exit:
 413         retval = usb_submit_urb(urb, GFP_ATOMIC);
 414         if (retval && retval != -EPERM && retval != -ENODEV)
 415                 dev_err(&acm->control->dev,
 416                         "%s - usb_submit_urb failed: %d\n", __func__, retval);
 417         else
 418                 dev_vdbg(&acm->control->dev,
 419                         "control resubmission terminated %d\n", retval);
 420 }
 421
 422 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 423 {
 424         int res;
 425
 426         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 427                 return 0;
 428
 429         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 430         if (res) {
 431                 if (res != -EPERM && res != -ENODEV) {
 432                         dev_err(&acm->data->dev,
 433                                 "urb %d failed submission with %d\n",
 434                                 index, res);
 435                 } else {
 436                         dev_vdbg(&acm->data->dev, "intended failure %d\n", res);
 437                 }
 438                 set_bit(index, &acm->read_urbs_free);
 439                 return res;
 440         } else {
 441                 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 442         }
 443
 444         return 0;
 445 }
 446
 447 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 448 {
 449         int res;
 450         int i;
 451
 452         for (i = 0; i < acm->rx_buflimit; ++i) {
 453                 res = acm_submit_read_urb(acm, i, mem_flags);
 454                 if (res)
 455                         return res;
 456         }
 457
 458         return 0;
 459 }
 460
 461 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 462 {
 463         if (!urb->actual_length)
 464                 return;
 465
 466         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 467                         urb->actual_length);
 468         tty_flip_buffer_push(&acm->port);
 469 }
 470
 471 static void acm_read_bulk_callback(struct urb *urb)
 472 {
 473         struct acm_rb *rb = urb->context;
 474         struct acm *acm = rb->instance;
 475         int status = urb->status;
 476         bool stopped = false;
 477         bool stalled = false;
 478         bool cooldown = false;
 479
 480         dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 481                 rb->index, urb->actual_length, status);
 482
 483         if (!acm->dev) {
 484                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 485                 return;
 486         }
 487
 488         switch (status) {
 489         case 0:
 490                 usb_mark_last_busy(acm->dev);
 491                 acm_process_read_urb(acm, urb);
 492                 break;
 493         case -EPIPE:
 494                 set_bit(EVENT_RX_STALL, &acm->flags);
 495                 stalled = true;
 496                 break;
 497         case -ENOENT:
 498         case -ECONNRESET:
 499         case -ESHUTDOWN:
 500                 dev_dbg(&acm->data->dev,
 501                         "%s - urb shutting down with status: %d\n",
 502                         __func__, status);
 503                 stopped = true;
 504                 break;
 505         case -EOVERFLOW:
 506         case -EPROTO:
 507                 dev_dbg(&acm->data->dev,
 508                         "%s - cooling babbling device\n", __func__);
 509                 usb_mark_last_busy(acm->dev);
 510                 set_bit(rb->index, &acm->urbs_in_error_delay);
 511                 cooldown = true;
 512                 break;
 513         default:
 514                 dev_dbg(&acm->data->dev,
 515                         "%s - nonzero urb status received: %d\n",
 516                         __func__, status);
 517                 break;
 518         }
 519
 520         /*
 521          * Make sure URB processing is done before marking as free to avoid
 522          * racing with unthrottle() on another CPU. Matches the barriers
 523          * implied by the test_and_clear_bit() in acm_submit_read_urb().
 524          */
 525         smp_mb__before_atomic();
 526         set_bit(rb->index, &acm->read_urbs_free);
 527         /*
 528          * Make sure URB is marked as free before checking the throttled flag
 529          * to avoid racing with unthrottle() on another CPU. Matches the
 530          * smp_mb() in unthrottle().
 531          */
 532         smp_mb__after_atomic();
 533
 534         if (stopped || stalled || cooldown) {
 535                 if (stalled)
 536                         schedule_work(&acm->work);
 537                 else if (cooldown)
 538                         schedule_delayed_work(&acm->dwork, HZ / 2);
 539                 return;
 540         }
 541
 542         if (test_bit(ACM_THROTTLED, &acm->flags))
 543                 return;
 544
 545         acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 546 }
 547
 548 /* data interface wrote those outgoing bytes */
 549 static void acm_write_bulk(struct urb *urb)
 550 {
 551         struct acm_wb *wb = urb->context;
 552         struct acm *acm = wb->instance;
 553         unsigned long flags;
 554         int status = urb->status;
 555
 556         if (status || (urb->actual_length != urb->transfer_buffer_length))
 557                 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
 558                         urb->actual_length,
 559                         urb->transfer_buffer_length,
 560                         status);
 561
 562         spin_lock_irqsave(&acm->write_lock, flags);
 563         acm_write_done(acm, wb);
 564         spin_unlock_irqrestore(&acm->write_lock, flags);
 565         set_bit(EVENT_TTY_WAKEUP, &acm->flags);
 566         schedule_work(&acm->work);
 567 }
 568
 569 static void acm_softint(struct work_struct *work)
 570 {
 571         int i;
 572         struct acm *acm = container_of(work, struct acm, work);
 573
 574         if (test_bit(EVENT_RX_STALL, &acm->flags)) {
 575                 smp_mb(); /* against acm_suspend() */
 576                 if (!acm->susp_count) {
 577                         for (i = 0; i < acm->rx_buflimit; i++)
 578                                 usb_kill_urb(acm->read_urbs[i]);
 579                         usb_clear_halt(acm->dev, acm->in);
 580                         acm_submit_read_urbs(acm, GFP_KERNEL);
 581                         clear_bit(EVENT_RX_STALL, &acm->flags);
 582                 }
 583         }
 584
 585         if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
 586                 for (i = 0; i < acm->rx_buflimit; i++)
 587                         if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
 588                                         acm_submit_read_urb(acm, i, GFP_NOIO);
 589         }
 590
 591         if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
 592                 tty_port_tty_wakeup(&acm->port);
 593 }
 594
 595 /*
 596  * TTY handlers
 597  */
 598
 599 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 600 {
 601         struct acm *acm;
 602         int retval;
 603
 604         acm = acm_get_by_minor(tty->index);
 605         if (!acm)
 606                 return -ENODEV;
 607
 608         retval = tty_standard_install(driver, tty);
 609         if (retval)
 610                 goto error_init_termios;
 611
 612         /*
 613          * Suppress initial echoing for some devices which might send data
 614          * immediately after acm driver has been installed.
 615          */
 616         if (acm->quirks & DISABLE_ECHO)
 617                 tty->termios.c_lflag &= ~ECHO;
 618
 619         tty->driver_data = acm;
 620
 621         return 0;
 622
 623 error_init_termios:
 624         tty_port_put(&acm->port);
 625         return retval;
 626 }
 627
 628 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 629 {
 630         struct acm *acm = tty->driver_data;
 631
 632         return tty_port_open(&acm->port, tty, filp);
 633 }
 634
 635 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 636 {
 637         struct acm *acm = container_of(port, struct acm, port);
 638         int val;
 639         int res;
 640
 641         if (raise)
 642                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 643         else
 644                 val = 0;
 645
 646         /* FIXME: add missing ctrlout locking throughout driver */
 647         acm->ctrlout = val;
 648
 649         res = acm_set_control(acm, val);
 650         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 651                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
 652 }
 653
 654 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 655 {
 656         struct acm *acm = container_of(port, struct acm, port);
 657         int retval = -ENODEV;
 658         int i;
 659
 660         mutex_lock(&acm->mutex);
 661         if (acm->disconnected)
 662                 goto disconnected;
 663
 664         retval = usb_autopm_get_interface(acm->control);
 665         if (retval)
 666                 goto error_get_interface;
 667
 668         /*
 669          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 670          * memory is really nasty...
 671          */
 672         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 673         acm->control->needs_remote_wakeup = 1;
 674
 675         acm->ctrlurb->dev = acm->dev;
 676         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 677         if (retval) {
 678                 dev_err(&acm->control->dev,
 679                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 680                 goto error_submit_urb;
 681         }
 682
 683         acm_tty_set_termios(tty, NULL);
 684
 685         /*
 686          * Unthrottle device in case the TTY was closed while throttled.
 687          */
 688         clear_bit(ACM_THROTTLED, &acm->flags);
 689
 690         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 691         if (retval)
 692                 goto error_submit_read_urbs;
 693
 694         usb_autopm_put_interface(acm->control);
 695
 696         mutex_unlock(&acm->mutex);
 697
 698         return 0;
 699
 700 error_submit_read_urbs:
 701         for (i = 0; i < acm->rx_buflimit; i++)
 702                 usb_kill_urb(acm->read_urbs[i]);
 703         usb_kill_urb(acm->ctrlurb);
 704 error_submit_urb:
 705         usb_autopm_put_interface(acm->control);
 706 error_get_interface:
 707 disconnected:
 708         mutex_unlock(&acm->mutex);
 709
 710         return usb_translate_errors(retval);
 711 }
 712
 713 static void acm_port_destruct(struct tty_port *port)
 714 {
 715         struct acm *acm = container_of(port, struct acm, port);
 716
 717         acm_release_minor(acm);
 718         usb_put_intf(acm->control);
 719         kfree(acm->country_codes);
 720         kfree(acm);
 721 }
 722
 723 static void acm_port_shutdown(struct tty_port *port)
 724 {
 725         struct acm *acm = container_of(port, struct acm, port);
 726         struct urb *urb;
 727         struct acm_wb *wb;
 728
 729         /*
 730          * Need to grab write_lock to prevent race with resume, but no need to
 731          * hold it due to the tty-port initialised flag.
 732          */
 733         spin_lock_irq(&acm->write_lock);
 734         spin_unlock_irq(&acm->write_lock);
 735
 736         usb_autopm_get_interface_no_resume(acm->control);
 737         acm->control->needs_remote_wakeup = 0;
 738         usb_autopm_put_interface(acm->control);
 739
 740         for (;;) {
 741                 urb = usb_get_from_anchor(&acm->delayed);
 742                 if (!urb)
 743                         break;
 744                 wb = urb->context;
 745                 wb->use = false;
 746                 usb_autopm_put_interface_async(acm->control);
 747         }
 748
 749         acm_kill_urbs(acm);
 750 }
 751
 752 static void acm_tty_cleanup(struct tty_struct *tty)
 753 {
 754         struct acm *acm = tty->driver_data;
 755
 756         tty_port_put(&acm->port);
 757 }
 758
 759 static void acm_tty_hangup(struct tty_struct *tty)
 760 {
 761         struct acm *acm = tty->driver_data;
 762
 763         tty_port_hangup(&acm->port);
 764 }
 765
 766 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 767 {
 768         struct acm *acm = tty->driver_data;
 769
 770         tty_port_close(&acm->port, tty, filp);
 771 }
 772
 773 static int acm_tty_write(struct tty_struct *tty,
 774                                         const unsigned char *buf, int count)
 775 {
 776         struct acm *acm = tty->driver_data;
 777         int stat;
 778         unsigned long flags;
 779         int wbn;
 780         struct acm_wb *wb;
 781
 782         if (!count)
 783                 return 0;
 784
 785         dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
 786
 787         spin_lock_irqsave(&acm->write_lock, flags);
 788         wbn = acm_wb_alloc(acm);
 789         if (wbn < 0) {
 790                 spin_unlock_irqrestore(&acm->write_lock, flags);
 791                 return 0;
 792         }
 793         wb = &acm->wb[wbn];
 794
 795         if (!acm->dev) {
 796                 wb->use = false;
 797                 spin_unlock_irqrestore(&acm->write_lock, flags);
 798                 return -ENODEV;
 799         }
 800
 801         count = (count > acm->writesize) ? acm->writesize : count;
 802         dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
 803         memcpy(wb->buf, buf, count);
 804         wb->len = count;
 805
 806         stat = usb_autopm_get_interface_async(acm->control);
 807         if (stat) {
 808                 wb->use = false;
 809                 spin_unlock_irqrestore(&acm->write_lock, flags);
 810                 return stat;
 811         }
 812
 813         if (acm->susp_count) {
 814                 usb_anchor_urb(wb->urb, &acm->delayed);
 815                 spin_unlock_irqrestore(&acm->write_lock, flags);
 816                 return count;
 817         }
 818
 819         stat = acm_start_wb(acm, wb);
 820         spin_unlock_irqrestore(&acm->write_lock, flags);
 821
 822         if (stat < 0)
 823                 return stat;
 824         return count;
 825 }
 826
 827 static int acm_tty_write_room(struct tty_struct *tty)
 828 {
 829         struct acm *acm = tty->driver_data;
 830         /*
 831          * Do not let the line discipline to know that we have a reserve,
 832          * or it might get too enthusiastic.
 833          */
 834         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 835 }
 836
 837 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 838 {
 839         struct acm *acm = tty->driver_data;
 840         /*
 841          * if the device was unplugged then any remaining characters fell out
 842          * of the connector ;)
 843          */
 844         if (acm->disconnected)
 845                 return 0;
 846         /*
 847          * This is inaccurate (overcounts), but it works.
 848          */
 849         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 850 }
 851
 852 static void acm_tty_throttle(struct tty_struct *tty)
 853 {
 854         struct acm *acm = tty->driver_data;
 855
 856         set_bit(ACM_THROTTLED, &acm->flags);
 857 }
 858
 859 static void acm_tty_unthrottle(struct tty_struct *tty)
 860 {
 861         struct acm *acm = tty->driver_data;
 862
 863         clear_bit(ACM_THROTTLED, &acm->flags);
 864
 865         /* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
 866         smp_mb();
 867
 868         acm_submit_read_urbs(acm, GFP_KERNEL);
 869 }
 870
 871 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 872 {
 873         struct acm *acm = tty->driver_data;
 874         int retval;
 875
 876         retval = acm_send_break(acm, state ? 0xffff : 0);
 877         if (retval < 0)
 878                 dev_dbg(&acm->control->dev,
 879                         "%s - send break failed\n", __func__);
 880         return retval;
 881 }
 882
 883 static int acm_tty_tiocmget(struct tty_struct *tty)
 884 {
 885         struct acm *acm = tty->driver_data;
 886
 887         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 888                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 889                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 890                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 891                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 892                TIOCM_CTS;
 893 }
 894
 895 static int acm_tty_tiocmset(struct tty_struct *tty,
 896                             unsigned int set, unsigned int clear)
 897 {
 898         struct acm *acm = tty->driver_data;
 899         unsigned int newctrl;
 900
 901         newctrl = acm->ctrlout;
 902         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 903                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 904         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 905                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 906
 907         newctrl = (newctrl & ~clear) | set;
 908
 909         if (acm->ctrlout == newctrl)
 910                 return 0;
 911         return acm_set_control(acm, acm->ctrlout = newctrl);
 912 }
 913
 914 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 915 {
 916         struct acm *acm = tty->driver_data;
 917
 918         ss->xmit_fifo_size = acm->writesize;
 919         ss->baud_base = le32_to_cpu(acm->line.dwDTERate);
 920         ss->close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
 921         ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 922                                 ASYNC_CLOSING_WAIT_NONE :
 923                                 jiffies_to_msecs(acm->port.closing_wait) / 10;
 924         return 0;
 925 }
 926
 927 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 928 {
 929         struct acm *acm = tty->driver_data;
 930         unsigned int closing_wait, close_delay;
 931         unsigned int old_closing_wait, old_close_delay;
 932         int retval = 0;
 933
 934         close_delay = msecs_to_jiffies(ss->close_delay * 10);
 935         closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 936                         ASYNC_CLOSING_WAIT_NONE :
 937                         msecs_to_jiffies(ss->closing_wait * 10);
 938
 939         /* we must redo the rounding here, so that the values match */
 940         old_close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
 941         old_closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 942                                 ASYNC_CLOSING_WAIT_NONE :
 943                                 jiffies_to_msecs(acm->port.closing_wait) / 10;
 944
 945         mutex_lock(&acm->port.mutex);
 946
 947         if (!capable(CAP_SYS_ADMIN)) {
 948                 if ((ss->close_delay != old_close_delay) ||
 949                     (ss->closing_wait != old_closing_wait))
 950                         retval = -EPERM;
 951                 else
 952                         retval = -EOPNOTSUPP;
 953         } else {
 954                 acm->port.close_delay  = close_delay;
 955                 acm->port.closing_wait = closing_wait;
 956         }
 957
 958         mutex_unlock(&acm->port.mutex);
 959         return retval;
 960 }
 961
 962 static int wait_serial_change(struct acm *acm, unsigned long arg)
 963 {
 964         int rv = 0;
 965         DECLARE_WAITQUEUE(wait, current);
 966         struct async_icount old, new;
 967
 968         do {
 969                 spin_lock_irq(&acm->read_lock);
 970                 old = acm->oldcount;
 971                 new = acm->iocount;
 972                 acm->oldcount = new;
 973                 spin_unlock_irq(&acm->read_lock);
 974
 975                 if ((arg & TIOCM_DSR) &&
 976                         old.dsr != new.dsr)
 977                         break;
 978                 if ((arg & TIOCM_CD)  &&
 979                         old.dcd != new.dcd)
 980                         break;
 981                 if ((arg & TIOCM_RI) &&
 982                         old.rng != new.rng)
 983                         break;
 984
 985                 add_wait_queue(&acm->wioctl, &wait);
 986                 set_current_state(TASK_INTERRUPTIBLE);
 987                 schedule();
 988                 remove_wait_queue(&acm->wioctl, &wait);
 989                 if (acm->disconnected) {
 990                         if (arg & TIOCM_CD)
 991                                 break;
 992                         else
 993                                 rv = -ENODEV;
 994                 } else {
 995                         if (signal_pending(current))
 996                                 rv = -ERESTARTSYS;
 997                 }
 998         } while (!rv);
 999
1000
1001
1002         return rv;
1003 }
1004
1005 static int acm_tty_get_icount(struct tty_struct *tty,
1006                                         struct serial_icounter_struct *icount)
1007 {
1008         struct acm *acm = tty->driver_data;
1009
1010         icount->dsr = acm->iocount.dsr;
1011         icount->rng = acm->iocount.rng;
1012         icount->dcd = acm->iocount.dcd;
1013         icount->frame = acm->iocount.frame;
1014         icount->overrun = acm->iocount.overrun;
1015         icount->parity = acm->iocount.parity;
1016         icount->brk = acm->iocount.brk;
1017
1018         return 0;
1019 }
1020
1021 static int acm_tty_ioctl(struct tty_struct *tty,
1022                                         unsigned int cmd, unsigned long arg)
1023 {
1024         struct acm *acm = tty->driver_data;
1025         int rv = -ENOIOCTLCMD;
1026
1027         switch (cmd) {
1028         case TIOCMIWAIT:
1029                 rv = usb_autopm_get_interface(acm->control);
1030                 if (rv < 0) {
1031                         rv = -EIO;
1032                         break;
1033                 }
1034                 rv = wait_serial_change(acm, arg);
1035                 usb_autopm_put_interface(acm->control);
1036                 break;
1037         }
1038
1039         return rv;
1040 }
1041
1042 static void acm_tty_set_termios(struct tty_struct *tty,
1043                                                 struct ktermios *termios_old)
1044 {
1045         struct acm *acm = tty->driver_data;
1046         struct ktermios *termios = &tty->termios;
1047         struct usb_cdc_line_coding newline;
1048         int newctrl = acm->ctrlout;
1049
1050         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1051         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1052         newline.bParityType = termios->c_cflag & PARENB ?
1053                                 (termios->c_cflag & PARODD ? 1 : 2) +
1054                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1055         switch (termios->c_cflag & CSIZE) {
1056         case CS5:
1057                 newline.bDataBits = 5;
1058                 break;
1059         case CS6:
1060                 newline.bDataBits = 6;
1061                 break;
1062         case CS7:
1063                 newline.bDataBits = 7;
1064                 break;
1065         case CS8:
1066         default:
1067                 newline.bDataBits = 8;
1068                 break;
1069         }
1070         /* FIXME: Needs to clear unsupported bits in the termios */
1071         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1072
1073         if (C_BAUD(tty) == B0) {
1074                 newline.dwDTERate = acm->line.dwDTERate;
1075                 newctrl &= ~ACM_CTRL_DTR;
1076         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1077                 newctrl |=  ACM_CTRL_DTR;
1078         }
1079
1080         if (newctrl != acm->ctrlout)
1081                 acm_set_control(acm, acm->ctrlout = newctrl);
1082
1083         if (memcmp(&acm->line, &newline, sizeof newline)) {
1084                 memcpy(&acm->line, &newline, sizeof newline);
1085                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1086                         __func__,
1087                         le32_to_cpu(newline.dwDTERate),
1088                         newline.bCharFormat, newline.bParityType,
1089                         newline.bDataBits);
1090                 acm_set_line(acm, &acm->line);
1091         }
1092 }
1093
1094 static const struct tty_port_operations acm_port_ops = {
1095         .dtr_rts = acm_port_dtr_rts,
1096         .shutdown = acm_port_shutdown,
1097         .activate = acm_port_activate,
1098         .destruct = acm_port_destruct,
1099 };
1100
1101 /*
1102  * USB probe and disconnect routines.
1103  */
1104
1105 /* Little helpers: write/read buffers free */
1106 static void acm_write_buffers_free(struct acm *acm)
1107 {
1108         int i;
1109         struct acm_wb *wb;
1110
1111         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1112                 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1113 }
1114
1115 static void acm_read_buffers_free(struct acm *acm)
1116 {
1117         int i;
1118
1119         for (i = 0; i < acm->rx_buflimit; i++)
1120                 usb_free_coherent(acm->dev, acm->readsize,
1121                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1122 }
1123
1124 /* Little helper: write buffers allocate */
1125 static int acm_write_buffers_alloc(struct acm *acm)
1126 {
1127         int i;
1128         struct acm_wb *wb;
1129
1130         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1131                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1132                     &wb->dmah);
1133                 if (!wb->buf) {
1134                         while (i != 0) {
1135                                 --i;
1136                                 --wb;
1137                                 usb_free_coherent(acm->dev, acm->writesize,
1138                                     wb->buf, wb->dmah);
1139                         }
1140                         return -ENOMEM;
1141                 }
1142         }
1143         return 0;
1144 }
1145
1146 static int acm_probe(struct usb_interface *intf,
1147                      const struct usb_device_id *id)
1148 {
1149         struct usb_cdc_union_desc *union_header = NULL;
1150         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1151         unsigned char *buffer = intf->altsetting->extra;
1152         int buflen = intf->altsetting->extralen;
1153         struct usb_interface *control_interface;
1154         struct usb_interface *data_interface;
1155         struct usb_endpoint_descriptor *epctrl = NULL;
1156         struct usb_endpoint_descriptor *epread = NULL;
1157         struct usb_endpoint_descriptor *epwrite = NULL;
1158         struct usb_device *usb_dev = interface_to_usbdev(intf);
1159         struct usb_cdc_parsed_header h;
1160         struct acm *acm;
1161         int minor;
1162         int ctrlsize, readsize;
1163         u8 *buf;
1164         int call_intf_num = -1;
1165         int data_intf_num = -1;
1166         unsigned long quirks;
1167         int num_rx_buf;
1168         int i;
1169         int combined_interfaces = 0;
1170         struct device *tty_dev;
1171         int rv = -ENOMEM;
1172         int res;
1173
1174         /* normal quirks */
1175         quirks = (unsigned long)id->driver_info;
1176
1177         if (quirks == IGNORE_DEVICE)
1178                 return -ENODEV;
1179
1180         memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1181
1182         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1183
1184         /* handle quirks deadly to normal probing*/
1185         if (quirks == NO_UNION_NORMAL) {
1186                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1187                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1188                 /* we would crash */
1189                 if (!data_interface || !control_interface)
1190                         return -ENODEV;
1191                 goto skip_normal_probe;
1192         }
1193
1194         /* normal probing*/
1195         if (!buffer) {
1196                 dev_err(&intf->dev, "Weird descriptor references\n");
1197                 return -EINVAL;
1198         }
1199
1200         if (!buflen) {
1201                 if (intf->cur_altsetting->endpoint &&
1202                                 intf->cur_altsetting->endpoint->extralen &&
1203                                 intf->cur_altsetting->endpoint->extra) {
1204                         dev_dbg(&intf->dev,
1205                                 "Seeking extra descriptors on endpoint\n");
1206                         buflen = intf->cur_altsetting->endpoint->extralen;
1207                         buffer = intf->cur_altsetting->endpoint->extra;
1208                 } else {
1209                         dev_err(&intf->dev,
1210                                 "Zero length descriptor references\n");
1211                         return -EINVAL;
1212                 }
1213         }
1214
1215         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1216         union_header = h.usb_cdc_union_desc;
1217         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1218         if (cmgmd)
1219                 call_intf_num = cmgmd->bDataInterface;
1220
1221         if (!union_header) {
1222                 if (intf->cur_altsetting->desc.bNumEndpoints == 3) {
1223                         dev_dbg(&intf->dev, "No union descriptor, assuming single interface\n");
1224                         combined_interfaces = 1;
1225                         control_interface = data_interface = intf;
1226                         goto look_for_collapsed_interface;
1227                 } else if (call_intf_num > 0) {
1228                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1229                         data_intf_num = call_intf_num;
1230                         data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1231                         control_interface = intf;
1232                 } else {
1233                         dev_dbg(&intf->dev, "No union descriptor, giving up\n");
1234                         return -ENODEV;
1235                 }
1236         } else {
1237                 int class = -1;
1238
1239                 data_intf_num = union_header->bSlaveInterface0;
1240                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1241                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1242
1243                 if (control_interface)
1244                         class = control_interface->cur_altsetting->desc.bInterfaceClass;
1245
1246                 if (class != USB_CLASS_COMM && class != USB_CLASS_CDC_DATA) {
1247                         dev_dbg(&intf->dev, "Broken union descriptor, assuming single interface\n");
1248                         combined_interfaces = 1;
1249                         control_interface = data_interface = intf;
1250                         goto look_for_collapsed_interface;
1251                 }
1252         }
1253
1254         if (!control_interface || !data_interface) {
1255                 dev_dbg(&intf->dev, "no interfaces\n");
1256                 return -ENODEV;
1257         }
1258
1259         if (data_intf_num != call_intf_num)
1260                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1261
1262         if (control_interface == data_interface) {
1263                 /* some broken devices designed for windows work this way */
1264                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1265                 combined_interfaces = 1;
1266                 /* a popular other OS doesn't use it */
1267                 quirks |= NO_CAP_LINE;
1268                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1269                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1270                         return -EINVAL;
1271                 }
1272 look_for_collapsed_interface:
1273                 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1274                                 &epread, &epwrite, &epctrl, NULL);
1275                 if (res)
1276                         return res;
1277
1278                 goto made_compressed_probe;
1279         }
1280
1281 skip_normal_probe:
1282
1283         /*workaround for switched interfaces */
1284         if (data_interface->cur_altsetting->desc.bInterfaceClass != USB_CLASS_CDC_DATA) {
1285                 if (control_interface->cur_altsetting->desc.bInterfaceClass == USB_CLASS_CDC_DATA) {
1286                         dev_dbg(&intf->dev,
1287                                 "Your device has switched interfaces.\n");
1288                         swap(control_interface, data_interface);
1289                 } else {
1290                         return -EINVAL;
1291                 }
1292         }
1293
1294         /* Accept probe requests only for the control interface */
1295         if (!combined_interfaces && intf != control_interface)
1296                 return -ENODEV;
1297
1298         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1299                 /* valid in this context */
1300                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1301                 return -EBUSY;
1302         }
1303
1304
1305         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1306             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1307                 return -EINVAL;
1308
1309         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1310         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1311         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1312
1313
1314         /* workaround for switched endpoints */
1315         if (!usb_endpoint_dir_in(epread)) {
1316                 /* descriptors are swapped */
1317                 dev_dbg(&intf->dev,
1318                         "The data interface has switched endpoints\n");
1319                 swap(epread, epwrite);
1320         }
1321 made_compressed_probe:
1322         dev_dbg(&intf->dev, "interfaces are valid\n");
1323
1324         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1325         if (acm == NULL)
1326                 goto alloc_fail;
1327
1328         tty_port_init(&acm->port);
1329         acm->port.ops = &acm_port_ops;
1330
1331         ctrlsize = usb_endpoint_maxp(epctrl);
1332         readsize = usb_endpoint_maxp(epread) *
1333                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1334         acm->combined_interfaces = combined_interfaces;
1335         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1336         acm->control = control_interface;
1337         acm->data = data_interface;
1338
1339         usb_get_intf(acm->control); /* undone in destruct() */
1340
1341         minor = acm_alloc_minor(acm);
1342         if (minor < 0)
1343                 goto alloc_fail1;
1344
1345         acm->minor = minor;
1346         acm->dev = usb_dev;
1347         if (h.usb_cdc_acm_descriptor)
1348                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1349         if (quirks & NO_CAP_LINE)
1350                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1351         acm->ctrlsize = ctrlsize;
1352         acm->readsize = readsize;
1353         acm->rx_buflimit = num_rx_buf;
1354         INIT_WORK(&acm->work, acm_softint);
1355         INIT_DELAYED_WORK(&acm->dwork, acm_softint);
1356         init_waitqueue_head(&acm->wioctl);
1357         spin_lock_init(&acm->write_lock);
1358         spin_lock_init(&acm->read_lock);
1359         mutex_init(&acm->mutex);
1360         if (usb_endpoint_xfer_int(epread)) {
1361                 acm->bInterval = epread->bInterval;
1362                 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1363         } else {
1364                 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1365         }
1366         if (usb_endpoint_xfer_int(epwrite))
1367                 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1368         else
1369                 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1370         init_usb_anchor(&acm->delayed);
1371         acm->quirks = quirks;
1372
1373         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1374         if (!buf)
1375                 goto alloc_fail1;
1376         acm->ctrl_buffer = buf;
1377
1378         if (acm_write_buffers_alloc(acm) < 0)
1379                 goto alloc_fail2;
1380
1381         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1382         if (!acm->ctrlurb)
1383                 goto alloc_fail3;
1384
1385         for (i = 0; i < num_rx_buf; i++) {
1386                 struct acm_rb *rb = &(acm->read_buffers[i]);
1387                 struct urb *urb;
1388
1389                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1390                                                                 &rb->dma);
1391                 if (!rb->base)
1392                         goto alloc_fail4;
1393                 rb->index = i;
1394                 rb->instance = acm;
1395
1396                 urb = usb_alloc_urb(0, GFP_KERNEL);
1397                 if (!urb)
1398                         goto alloc_fail4;
1399
1400                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1401                 urb->transfer_dma = rb->dma;
1402                 if (usb_endpoint_xfer_int(epread))
1403                         usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1404                                          acm->readsize,
1405                                          acm_read_bulk_callback, rb,
1406                                          acm->bInterval);
1407                 else
1408                         usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1409                                           acm->readsize,
1410                                           acm_read_bulk_callback, rb);
1411
1412                 acm->read_urbs[i] = urb;
1413                 __set_bit(i, &acm->read_urbs_free);
1414         }
1415         for (i = 0; i < ACM_NW; i++) {
1416                 struct acm_wb *snd = &(acm->wb[i]);
1417
1418                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1419                 if (snd->urb == NULL)
1420                         goto alloc_fail5;
1421
1422                 if (usb_endpoint_xfer_int(epwrite))
1423                         usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1424                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1425                 else
1426                         usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1427                                 NULL, acm->writesize, acm_write_bulk, snd);
1428                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1429                 if (quirks & SEND_ZERO_PACKET)
1430                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1431                 snd->instance = acm;
1432         }
1433
1434         usb_set_intfdata(intf, acm);
1435
1436         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1437         if (i < 0)
1438                 goto alloc_fail5;
1439
1440         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1441                 struct usb_cdc_country_functional_desc * cfd =
1442                                         h.usb_cdc_country_functional_desc;
1443
1444                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1445                 if (!acm->country_codes)
1446                         goto skip_countries;
1447                 acm->country_code_size = cfd->bLength - 4;
1448                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1449                                                         cfd->bLength - 4);
1450                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1451
1452                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1453                 if (i < 0) {
1454                         kfree(acm->country_codes);
1455                         acm->country_codes = NULL;
1456                         acm->country_code_size = 0;
1457                         goto skip_countries;
1458                 }
1459
1460                 i = device_create_file(&intf->dev,
1461                                                 &dev_attr_iCountryCodeRelDate);
1462                 if (i < 0) {
1463                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1464                         kfree(acm->country_codes);
1465                         acm->country_codes = NULL;
1466                         acm->country_code_size = 0;
1467                         goto skip_countries;
1468                 }
1469         }
1470
1471 skip_countries:
1472         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1473                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1474                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1475                          /* works around buggy devices */
1476                          epctrl->bInterval ? epctrl->bInterval : 16);
1477         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1478         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1479         acm->notification_buffer = NULL;
1480         acm->nb_index = 0;
1481         acm->nb_size = 0;
1482
1483         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1484
1485         acm->line.dwDTERate = cpu_to_le32(9600);
1486         acm->line.bDataBits = 8;
1487         acm_set_line(acm, &acm->line);
1488
1489         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1490         usb_set_intfdata(data_interface, acm);
1491
1492         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1493                         &control_interface->dev);
1494         if (IS_ERR(tty_dev)) {
1495                 rv = PTR_ERR(tty_dev);
1496                 goto alloc_fail6;
1497         }
1498
1499         if (quirks & CLEAR_HALT_CONDITIONS) {
1500                 usb_clear_halt(usb_dev, acm->in);
1501                 usb_clear_halt(usb_dev, acm->out);
1502         }
1503
1504         return 0;
1505 alloc_fail6:
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                 kfree(acm->country_codes);
1512         }
1513         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1514 alloc_fail5:
1515         usb_set_intfdata(intf, NULL);
1516         for (i = 0; i < ACM_NW; i++)
1517                 usb_free_urb(acm->wb[i].urb);
1518 alloc_fail4:
1519         for (i = 0; i < num_rx_buf; i++)
1520                 usb_free_urb(acm->read_urbs[i]);
1521         acm_read_buffers_free(acm);
1522         usb_free_urb(acm->ctrlurb);
1523 alloc_fail3:
1524         acm_write_buffers_free(acm);
1525 alloc_fail2:
1526         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1527 alloc_fail1:
1528         tty_port_put(&acm->port);
1529 alloc_fail:
1530         return rv;
1531 }
1532
1533 static void acm_disconnect(struct usb_interface *intf)
1534 {
1535         struct acm *acm = usb_get_intfdata(intf);
1536         struct tty_struct *tty;
1537         int i;
1538
1539         /* sibling interface is already cleaning up */
1540         if (!acm)
1541                 return;
1542
1543         mutex_lock(&acm->mutex);
1544         acm->disconnected = true;
1545         if (acm->country_codes) {
1546                 device_remove_file(&acm->control->dev,
1547                                 &dev_attr_wCountryCodes);
1548                 device_remove_file(&acm->control->dev,
1549                                 &dev_attr_iCountryCodeRelDate);
1550         }
1551         wake_up_all(&acm->wioctl);
1552         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1553         usb_set_intfdata(acm->control, NULL);
1554         usb_set_intfdata(acm->data, NULL);
1555         mutex_unlock(&acm->mutex);
1556
1557         tty = tty_port_tty_get(&acm->port);
1558         if (tty) {
1559                 tty_vhangup(tty);
1560                 tty_kref_put(tty);
1561         }
1562
1563         acm_kill_urbs(acm);
1564         cancel_work_sync(&acm->work);
1565         cancel_delayed_work_sync(&acm->dwork);
1566
1567         tty_unregister_device(acm_tty_driver, acm->minor);
1568
1569         usb_free_urb(acm->ctrlurb);
1570         for (i = 0; i < ACM_NW; i++)
1571                 usb_free_urb(acm->wb[i].urb);
1572         for (i = 0; i < acm->rx_buflimit; i++)
1573                 usb_free_urb(acm->read_urbs[i]);
1574         acm_write_buffers_free(acm);
1575         usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1576         acm_read_buffers_free(acm);
1577
1578         kfree(acm->notification_buffer);
1579
1580         if (!acm->combined_interfaces)
1581                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1582                                         acm->data : acm->control);
1583
1584         tty_port_put(&acm->port);
1585 }
1586
1587 #ifdef CONFIG_PM
1588 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1589 {
1590         struct acm *acm = usb_get_intfdata(intf);
1591         int cnt;
1592
1593         spin_lock_irq(&acm->write_lock);
1594         if (PMSG_IS_AUTO(message)) {
1595                 if (acm->transmitting) {
1596                         spin_unlock_irq(&acm->write_lock);
1597                         return -EBUSY;
1598                 }
1599         }
1600         cnt = acm->susp_count++;
1601         spin_unlock_irq(&acm->write_lock);
1602
1603         if (cnt)
1604                 return 0;
1605
1606         acm_kill_urbs(acm);
1607         cancel_work_sync(&acm->work);
1608         cancel_delayed_work_sync(&acm->dwork);
1609         acm->urbs_in_error_delay = 0;
1610
1611         return 0;
1612 }
1613
1614 static int acm_resume(struct usb_interface *intf)
1615 {
1616         struct acm *acm = usb_get_intfdata(intf);
1617         struct urb *urb;
1618         int rv = 0;
1619
1620         spin_lock_irq(&acm->write_lock);
1621
1622         if (--acm->susp_count)
1623                 goto out;
1624
1625         if (tty_port_initialized(&acm->port)) {
1626                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1627
1628                 for (;;) {
1629                         urb = usb_get_from_anchor(&acm->delayed);
1630                         if (!urb)
1631                                 break;
1632
1633                         acm_start_wb(acm, urb->context);
1634                 }
1635
1636                 /*
1637                  * delayed error checking because we must
1638                  * do the write path at all cost
1639                  */
1640                 if (rv < 0)
1641                         goto out;
1642
1643                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1644         }
1645 out:
1646         spin_unlock_irq(&acm->write_lock);
1647
1648         return rv;
1649 }
1650
1651 static int acm_reset_resume(struct usb_interface *intf)
1652 {
1653         struct acm *acm = usb_get_intfdata(intf);
1654
1655         if (tty_port_initialized(&acm->port))
1656                 tty_port_tty_hangup(&acm->port, false);
1657
1658         return acm_resume(intf);
1659 }
1660
1661 #endif /* CONFIG_PM */
1662
1663 static int acm_pre_reset(struct usb_interface *intf)
1664 {
1665         struct acm *acm = usb_get_intfdata(intf);
1666
1667         clear_bit(EVENT_RX_STALL, &acm->flags);
1668         acm->nb_index = 0; /* pending control transfers are lost */
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
1687 static const struct usb_device_id acm_ids[] = {
1688         /* quirky and broken devices */
1689         { USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1690           .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
1691         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1692         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1693         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1694         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1695         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1696         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1697         },
1698         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1699         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1700         },
1701         { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1702         .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1703         },
1704         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1705         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1706         },
1707         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1708         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1709         },
1710         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1711         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1712         },
1713         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1714         .driver_info = SINGLE_RX_URB,
1715         },
1716         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1717         .driver_info = SINGLE_RX_URB, /* firmware bug */
1718         },
1719         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1720         .driver_info = SINGLE_RX_URB, /* firmware bug */
1721         },
1722         { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1723         .driver_info = SINGLE_RX_URB,
1724         },
1725         { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1726         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1727         },
1728         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1729         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1730         },
1731         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1732         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1733         },
1734         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1735         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1736         },
1737         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1738         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1739         },
1740         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1741         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1742         },
1743         { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1744         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1745         },
1746         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1747         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1748         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1749         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1750         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1751         },
1752         /* Motorola H24 HSPA module: */
1753         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1754         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1755         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1756         },
1757         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1758         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1759         },
1760         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1761         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1762         },
1763         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1764         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1765         },
1766         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1767         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1768         },
1769         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1770         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1771         },
1772         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1773         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1774         },
1775
1776         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1777         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1778                                            data interface instead of
1779                                            communications interface.
1780                                            Maybe we should define a new
1781                                            quirk for this. */
1782         },
1783         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1784         .driver_info = NO_UNION_NORMAL,
1785         },
1786         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1787         .driver_info = NO_UNION_NORMAL,
1788         },
1789         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1790         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1791         },
1792         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1793         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1794         },
1795         { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1796         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1797         },
1798         { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1799         .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1800         },
1801         { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1802         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1803         },
1804
1805         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1806         .driver_info = CLEAR_HALT_CONDITIONS,
1807         },
1808
1809         /* Nokia S60 phones expose two ACM channels. The first is
1810          * a modem and is picked up by the standard AT-command
1811          * information below. The second is 'vendor-specific' but
1812          * is treated as a serial device at the S60 end, so we want
1813          * to expose it on Linux too. */
1814         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1815         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1816         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1817         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1818         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1819         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1820         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1821         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1822         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1823         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1824         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1825         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1826         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1827         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1828         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1829         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1830         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1831         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1832         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1833         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1834         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1835         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1836         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1837         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1838         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1839         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1840         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1841         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1842         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1843         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1844         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1845         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1846         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1847         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1848         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1849         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1850         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1851         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1852         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1853         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1854         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1855         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1856         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1857         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1858         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1859         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1860         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1861         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1862         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1863         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1864         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1865         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1866         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1867         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1868         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1869         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1870         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1871         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1872
1873         /* Support for Owen devices */
1874         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1875
1876         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1877
1878 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1879         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1880         .driver_info = IGNORE_DEVICE,
1881         },
1882         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1883         .driver_info = IGNORE_DEVICE,
1884         },
1885 #endif
1886
1887 #if IS_ENABLED(CONFIG_IR_TOY)
1888         { USB_DEVICE(0x04d8, 0xfd08),
1889         .driver_info = IGNORE_DEVICE,
1890         },
1891 #endif
1892
1893         /*Samsung phone in firmware update mode */
1894         { USB_DEVICE(0x04e8, 0x685d),
1895         .driver_info = IGNORE_DEVICE,
1896         },
1897
1898         /* Exclude Infineon Flash Loader utility */
1899         { USB_DEVICE(0x058b, 0x0041),
1900         .driver_info = IGNORE_DEVICE,
1901         },
1902
1903         /* Exclude ETAS ES58x */
1904         { USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
1905         .driver_info = IGNORE_DEVICE,
1906         },
1907         { USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
1908         .driver_info = IGNORE_DEVICE,
1909         },
1910         { USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
1911         .driver_info = IGNORE_DEVICE,
1912         },
1913
1914         { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1915         .driver_info = SEND_ZERO_PACKET,
1916         },
1917         { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1918         .driver_info = SEND_ZERO_PACKET,
1919         },
1920
1921         /* control interfaces without any protocol set */
1922         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1923                 USB_CDC_PROTO_NONE) },
1924
1925         /* control interfaces with various AT-command sets */
1926         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1927                 USB_CDC_ACM_PROTO_AT_V25TER) },
1928         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1929                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1930         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1931                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1932         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1933                 USB_CDC_ACM_PROTO_AT_GSM) },
1934         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1935                 USB_CDC_ACM_PROTO_AT_3G) },
1936         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1937                 USB_CDC_ACM_PROTO_AT_CDMA) },
1938
1939         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1940         .driver_info = SEND_ZERO_PACKET,
1941         },
1942
1943         { }
1944 };
1945
1946 MODULE_DEVICE_TABLE(usb, acm_ids);
1947
1948 static struct usb_driver acm_driver = {
1949         .name =         "cdc_acm",
1950         .probe =        acm_probe,
1951         .disconnect =   acm_disconnect,
1952 #ifdef CONFIG_PM
1953         .suspend =      acm_suspend,
1954         .resume =       acm_resume,
1955         .reset_resume = acm_reset_resume,
1956 #endif
1957         .pre_reset =    acm_pre_reset,
1958         .id_table =     acm_ids,
1959 #ifdef CONFIG_PM
1960         .supports_autosuspend = 1,
1961 #endif
1962         .disable_hub_initiated_lpm = 1,
1963 };
1964
1965 /*
1966  * TTY driver structures.
1967  */
1968
1969 static const struct tty_operations acm_ops = {
1970         .install =              acm_tty_install,
1971         .open =                 acm_tty_open,
1972         .close =                acm_tty_close,
1973         .cleanup =              acm_tty_cleanup,
1974         .hangup =               acm_tty_hangup,
1975         .write =                acm_tty_write,
1976         .write_room =           acm_tty_write_room,
1977         .ioctl =                acm_tty_ioctl,
1978         .throttle =             acm_tty_throttle,
1979         .unthrottle =           acm_tty_unthrottle,
1980         .chars_in_buffer =      acm_tty_chars_in_buffer,
1981         .break_ctl =            acm_tty_break_ctl,
1982         .set_termios =          acm_tty_set_termios,
1983         .tiocmget =             acm_tty_tiocmget,
1984         .tiocmset =             acm_tty_tiocmset,
1985         .get_serial =           get_serial_info,
1986         .set_serial =           set_serial_info,
1987         .get_icount =           acm_tty_get_icount,
1988 };
1989
1990 /*
1991  * Init / exit.
1992  */
1993
1994 static int __init acm_init(void)
1995 {
1996         int retval;
1997         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1998         if (!acm_tty_driver)
1999                 return -ENOMEM;
2000         acm_tty_driver->driver_name = "acm",
2001         acm_tty_driver->name = "ttyACM",
2002         acm_tty_driver->major = ACM_TTY_MAJOR,
2003         acm_tty_driver->minor_start = 0,
2004         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2005         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2006         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2007         acm_tty_driver->init_termios = tty_std_termios;
2008         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2009                                                                 HUPCL | CLOCAL;
2010         tty_set_operations(acm_tty_driver, &acm_ops);
2011
2012         retval = tty_register_driver(acm_tty_driver);
2013         if (retval) {
2014                 put_tty_driver(acm_tty_driver);
2015                 return retval;
2016         }
2017
2018         retval = usb_register(&acm_driver);
2019         if (retval) {
2020                 tty_unregister_driver(acm_tty_driver);
2021                 put_tty_driver(acm_tty_driver);
2022                 return retval;
2023         }
2024
2025         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2026
2027         return 0;
2028 }
2029
2030 static void __exit acm_exit(void)
2031 {
2032         usb_deregister(&acm_driver);
2033         tty_unregister_driver(acm_tty_driver);
2034         put_tty_driver(acm_tty_driver);
2035         idr_destroy(&acm_minors);
2036 }
2037
2038 module_init(acm_init);
2039 module_exit(acm_exit);
2040
2041 MODULE_AUTHOR(DRIVER_AUTHOR);
2042 MODULE_DESCRIPTION(DRIVER_DESC);
2043 MODULE_LICENSE("GPL");
2044 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);