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_poison_urbs(struct acm *acm)
 151 {
 152         int i;
 153
 154         usb_poison_urb(acm->ctrlurb);
 155         for (i = 0; i < ACM_NW; i++)
 156                 usb_poison_urb(acm->wb[i].urb);
 157         for (i = 0; i < acm->rx_buflimit; i++)
 158                 usb_poison_urb(acm->read_urbs[i]);
 159 }
 160
 161 static void acm_unpoison_urbs(struct acm *acm)
 162 {
 163         int i;
 164
 165         for (i = 0; i < acm->rx_buflimit; i++)
 166                 usb_unpoison_urb(acm->read_urbs[i]);
 167         for (i = 0; i < ACM_NW; i++)
 168                 usb_unpoison_urb(acm->wb[i].urb);
 169         usb_unpoison_urb(acm->ctrlurb);
 170 }
 171
 172
 173 /*
 174  * Write buffer management.
 175  * All of these assume proper locks taken by the caller.
 176  */
 177
 178 static int acm_wb_alloc(struct acm *acm)
 179 {
 180         int i, wbn;
 181         struct acm_wb *wb;
 182
 183         wbn = 0;
 184         i = 0;
 185         for (;;) {
 186                 wb = &acm->wb[wbn];
 187                 if (!wb->use) {
 188                         wb->use = true;
 189                         wb->len = 0;
 190                         return wbn;
 191                 }
 192                 wbn = (wbn + 1) % ACM_NW;
 193                 if (++i >= ACM_NW)
 194                         return -1;
 195         }
 196 }
 197
 198 static int acm_wb_is_avail(struct acm *acm)
 199 {
 200         int i, n;
 201         unsigned long flags;
 202
 203         n = ACM_NW;
 204         spin_lock_irqsave(&acm->write_lock, flags);
 205         for (i = 0; i < ACM_NW; i++)
 206                 if(acm->wb[i].use)
 207                         n--;
 208         spin_unlock_irqrestore(&acm->write_lock, flags);
 209         return n;
 210 }
 211
 212 /*
 213  * Finish write. Caller must hold acm->write_lock
 214  */
 215 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 216 {
 217         wb->use = false;
 218         acm->transmitting--;
 219         usb_autopm_put_interface_async(acm->control);
 220 }
 221
 222 /*
 223  * Poke write.
 224  *
 225  * the caller is responsible for locking
 226  */
 227
 228 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 229 {
 230         int rc;
 231
 232         acm->transmitting++;
 233
 234         wb->urb->transfer_buffer = wb->buf;
 235         wb->urb->transfer_dma = wb->dmah;
 236         wb->urb->transfer_buffer_length = wb->len;
 237         wb->urb->dev = acm->dev;
 238
 239         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 240         if (rc < 0) {
 241                 if (rc != -EPERM)
 242                         dev_err(&acm->data->dev,
 243                                 "%s - usb_submit_urb(write bulk) failed: %d\n",
 244                                 __func__, rc);
 245                 acm_write_done(acm, wb);
 246         }
 247         return rc;
 248 }
 249
 250 /*
 251  * attributes exported through sysfs
 252  */
 253 static ssize_t bmCapabilities_show
 254 (struct device *dev, struct device_attribute *attr, char *buf)
 255 {
 256         struct usb_interface *intf = to_usb_interface(dev);
 257         struct acm *acm = usb_get_intfdata(intf);
 258
 259         return sprintf(buf, "%d", acm->ctrl_caps);
 260 }
 261 static DEVICE_ATTR_RO(bmCapabilities);
 262
 263 static ssize_t wCountryCodes_show
 264 (struct device *dev, struct device_attribute *attr, char *buf)
 265 {
 266         struct usb_interface *intf = to_usb_interface(dev);
 267         struct acm *acm = usb_get_intfdata(intf);
 268
 269         memcpy(buf, acm->country_codes, acm->country_code_size);
 270         return acm->country_code_size;
 271 }
 272
 273 static DEVICE_ATTR_RO(wCountryCodes);
 274
 275 static ssize_t iCountryCodeRelDate_show
 276 (struct device *dev, struct device_attribute *attr, char *buf)
 277 {
 278         struct usb_interface *intf = to_usb_interface(dev);
 279         struct acm *acm = usb_get_intfdata(intf);
 280
 281         return sprintf(buf, "%d", acm->country_rel_date);
 282 }
 283
 284 static DEVICE_ATTR_RO(iCountryCodeRelDate);
 285 /*
 286  * Interrupt handlers for various ACM device responses
 287  */
 288
 289 static void acm_process_notification(struct acm *acm, unsigned char *buf)
 290 {
 291         int newctrl;
 292         int difference;
 293         unsigned long flags;
 294         struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
 295         unsigned char *data = buf + sizeof(struct usb_cdc_notification);
 296
 297         switch (dr->bNotificationType) {
 298         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 299                 dev_dbg(&acm->control->dev,
 300                         "%s - network connection: %d\n", __func__, dr->wValue);
 301                 break;
 302
 303         case USB_CDC_NOTIFY_SERIAL_STATE:
 304                 if (le16_to_cpu(dr->wLength) != 2) {
 305                         dev_dbg(&acm->control->dev,
 306                                 "%s - malformed serial state\n", __func__);
 307                         break;
 308                 }
 309
 310                 newctrl = get_unaligned_le16(data);
 311                 dev_dbg(&acm->control->dev,
 312                         "%s - serial state: 0x%x\n", __func__, newctrl);
 313
 314                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 315                         dev_dbg(&acm->control->dev,
 316                                 "%s - calling hangup\n", __func__);
 317                         tty_port_tty_hangup(&acm->port, false);
 318                 }
 319
 320                 difference = acm->ctrlin ^ newctrl;
 321                 spin_lock_irqsave(&acm->read_lock, flags);
 322                 acm->ctrlin = newctrl;
 323                 acm->oldcount = acm->iocount;
 324
 325                 if (difference & ACM_CTRL_DSR)
 326                         acm->iocount.dsr++;
 327                 if (difference & ACM_CTRL_DCD)
 328                         acm->iocount.dcd++;
 329                 if (newctrl & ACM_CTRL_BRK) {
 330                         acm->iocount.brk++;
 331                         tty_insert_flip_char(&acm->port, 0, TTY_BREAK);
 332                 }
 333                 if (newctrl & ACM_CTRL_RI)
 334                         acm->iocount.rng++;
 335                 if (newctrl & ACM_CTRL_FRAMING)
 336                         acm->iocount.frame++;
 337                 if (newctrl & ACM_CTRL_PARITY)
 338                         acm->iocount.parity++;
 339                 if (newctrl & ACM_CTRL_OVERRUN)
 340                         acm->iocount.overrun++;
 341                 spin_unlock_irqrestore(&acm->read_lock, flags);
 342
 343                 if (difference)
 344                         wake_up_all(&acm->wioctl);
 345
 346                 break;
 347
 348         default:
 349                 dev_dbg(&acm->control->dev,
 350                         "%s - unknown notification %d received: index %d len %d\n",
 351                         __func__,
 352                         dr->bNotificationType, dr->wIndex, dr->wLength);
 353         }
 354 }
 355
 356 /* control interface reports status changes with "interrupt" transfers */
 357 static void acm_ctrl_irq(struct urb *urb)
 358 {
 359         struct acm *acm = urb->context;
 360         struct usb_cdc_notification *dr = urb->transfer_buffer;
 361         unsigned int current_size = urb->actual_length;
 362         unsigned int expected_size, copy_size, alloc_size;
 363         int retval;
 364         int status = urb->status;
 365
 366         switch (status) {
 367         case 0:
 368                 /* success */
 369                 break;
 370         case -ECONNRESET:
 371         case -ENOENT:
 372         case -ESHUTDOWN:
 373                 /* this urb is terminated, clean up */
 374                 dev_dbg(&acm->control->dev,
 375                         "%s - urb shutting down with status: %d\n",
 376                         __func__, status);
 377                 return;
 378         default:
 379                 dev_dbg(&acm->control->dev,
 380                         "%s - nonzero urb status received: %d\n",
 381                         __func__, status);
 382                 goto exit;
 383         }
 384
 385         usb_mark_last_busy(acm->dev);
 386
 387         if (acm->nb_index)
 388                 dr = (struct usb_cdc_notification *)acm->notification_buffer;
 389
 390         /* size = notification-header + (optional) data */
 391         expected_size = sizeof(struct usb_cdc_notification) +
 392                                         le16_to_cpu(dr->wLength);
 393
 394         if (current_size < expected_size) {
 395                 /* notification is transmitted fragmented, reassemble */
 396                 if (acm->nb_size < expected_size) {
 397                         u8 *new_buffer;
 398                         alloc_size = roundup_pow_of_two(expected_size);
 399                         /* Final freeing is done on disconnect. */
 400                         new_buffer = krealloc(acm->notification_buffer,
 401                                               alloc_size, GFP_ATOMIC);
 402                         if (!new_buffer) {
 403                                 acm->nb_index = 0;
 404                                 goto exit;
 405                         }
 406
 407                         acm->notification_buffer = new_buffer;
 408                         acm->nb_size = alloc_size;
 409                         dr = (struct usb_cdc_notification *)acm->notification_buffer;
 410                 }
 411
 412                 copy_size = min(current_size,
 413                                 expected_size - acm->nb_index);
 414
 415                 memcpy(&acm->notification_buffer[acm->nb_index],
 416                        urb->transfer_buffer, copy_size);
 417                 acm->nb_index += copy_size;
 418                 current_size = acm->nb_index;
 419         }
 420
 421         if (current_size >= expected_size) {
 422                 /* notification complete */
 423                 acm_process_notification(acm, (unsigned char *)dr);
 424                 acm->nb_index = 0;
 425         }
 426
 427 exit:
 428         retval = usb_submit_urb(urb, GFP_ATOMIC);
 429         if (retval && retval != -EPERM && retval != -ENODEV)
 430                 dev_err(&acm->control->dev,
 431                         "%s - usb_submit_urb failed: %d\n", __func__, retval);
 432         else
 433                 dev_vdbg(&acm->control->dev,
 434                         "control resubmission terminated %d\n", retval);
 435 }
 436
 437 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 438 {
 439         int res;
 440
 441         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 442                 return 0;
 443
 444         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 445         if (res) {
 446                 if (res != -EPERM && res != -ENODEV) {
 447                         dev_err(&acm->data->dev,
 448                                 "urb %d failed submission with %d\n",
 449                                 index, res);
 450                 } else {
 451                         dev_vdbg(&acm->data->dev, "intended failure %d\n", res);
 452                 }
 453                 set_bit(index, &acm->read_urbs_free);
 454                 return res;
 455         } else {
 456                 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 457         }
 458
 459         return 0;
 460 }
 461
 462 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 463 {
 464         int res;
 465         int i;
 466
 467         for (i = 0; i < acm->rx_buflimit; ++i) {
 468                 res = acm_submit_read_urb(acm, i, mem_flags);
 469                 if (res)
 470                         return res;
 471         }
 472
 473         return 0;
 474 }
 475
 476 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 477 {
 478         if (!urb->actual_length)
 479                 return;
 480
 481         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 482                         urb->actual_length);
 483         tty_flip_buffer_push(&acm->port);
 484 }
 485
 486 static void acm_read_bulk_callback(struct urb *urb)
 487 {
 488         struct acm_rb *rb = urb->context;
 489         struct acm *acm = rb->instance;
 490         int status = urb->status;
 491         bool stopped = false;
 492         bool stalled = false;
 493         bool cooldown = false;
 494
 495         dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 496                 rb->index, urb->actual_length, status);
 497
 498         switch (status) {
 499         case 0:
 500                 usb_mark_last_busy(acm->dev);
 501                 acm_process_read_urb(acm, urb);
 502                 break;
 503         case -EPIPE:
 504                 set_bit(EVENT_RX_STALL, &acm->flags);
 505                 stalled = true;
 506                 break;
 507         case -ENOENT:
 508         case -ECONNRESET:
 509         case -ESHUTDOWN:
 510                 dev_dbg(&acm->data->dev,
 511                         "%s - urb shutting down with status: %d\n",
 512                         __func__, status);
 513                 stopped = true;
 514                 break;
 515         case -EOVERFLOW:
 516         case -EPROTO:
 517                 dev_dbg(&acm->data->dev,
 518                         "%s - cooling babbling device\n", __func__);
 519                 usb_mark_last_busy(acm->dev);
 520                 set_bit(rb->index, &acm->urbs_in_error_delay);
 521                 set_bit(ACM_ERROR_DELAY, &acm->flags);
 522                 cooldown = true;
 523                 break;
 524         default:
 525                 dev_dbg(&acm->data->dev,
 526                         "%s - nonzero urb status received: %d\n",
 527                         __func__, status);
 528                 break;
 529         }
 530
 531         /*
 532          * Make sure URB processing is done before marking as free to avoid
 533          * racing with unthrottle() on another CPU. Matches the barriers
 534          * implied by the test_and_clear_bit() in acm_submit_read_urb().
 535          */
 536         smp_mb__before_atomic();
 537         set_bit(rb->index, &acm->read_urbs_free);
 538         /*
 539          * Make sure URB is marked as free before checking the throttled flag
 540          * to avoid racing with unthrottle() on another CPU. Matches the
 541          * smp_mb() in unthrottle().
 542          */
 543         smp_mb__after_atomic();
 544
 545         if (stopped || stalled || cooldown) {
 546                 if (stalled)
 547                         schedule_delayed_work(&acm->dwork, 0);
 548                 else if (cooldown)
 549                         schedule_delayed_work(&acm->dwork, HZ / 2);
 550                 return;
 551         }
 552
 553         if (test_bit(ACM_THROTTLED, &acm->flags))
 554                 return;
 555
 556         acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 557 }
 558
 559 /* data interface wrote those outgoing bytes */
 560 static void acm_write_bulk(struct urb *urb)
 561 {
 562         struct acm_wb *wb = urb->context;
 563         struct acm *acm = wb->instance;
 564         unsigned long flags;
 565         int status = urb->status;
 566
 567         if (status || (urb->actual_length != urb->transfer_buffer_length))
 568                 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
 569                         urb->actual_length,
 570                         urb->transfer_buffer_length,
 571                         status);
 572
 573         spin_lock_irqsave(&acm->write_lock, flags);
 574         acm_write_done(acm, wb);
 575         spin_unlock_irqrestore(&acm->write_lock, flags);
 576         set_bit(EVENT_TTY_WAKEUP, &acm->flags);
 577         schedule_delayed_work(&acm->dwork, 0);
 578 }
 579
 580 static void acm_softint(struct work_struct *work)
 581 {
 582         int i;
 583         struct acm *acm = container_of(work, struct acm, dwork.work);
 584
 585         if (test_bit(EVENT_RX_STALL, &acm->flags)) {
 586                 smp_mb(); /* against acm_suspend() */
 587                 if (!acm->susp_count) {
 588                         for (i = 0; i < acm->rx_buflimit; i++)
 589                                 usb_kill_urb(acm->read_urbs[i]);
 590                         usb_clear_halt(acm->dev, acm->in);
 591                         acm_submit_read_urbs(acm, GFP_KERNEL);
 592                         clear_bit(EVENT_RX_STALL, &acm->flags);
 593                 }
 594         }
 595
 596         if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
 597                 for (i = 0; i < acm->rx_buflimit; i++)
 598                         if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
 599                                 acm_submit_read_urb(acm, i, GFP_KERNEL);
 600         }
 601
 602         if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
 603                 tty_port_tty_wakeup(&acm->port);
 604 }
 605
 606 /*
 607  * TTY handlers
 608  */
 609
 610 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 611 {
 612         struct acm *acm;
 613         int retval;
 614
 615         acm = acm_get_by_minor(tty->index);
 616         if (!acm)
 617                 return -ENODEV;
 618
 619         retval = tty_standard_install(driver, tty);
 620         if (retval)
 621                 goto error_init_termios;
 622
 623         /*
 624          * Suppress initial echoing for some devices which might send data
 625          * immediately after acm driver has been installed.
 626          */
 627         if (acm->quirks & DISABLE_ECHO)
 628                 tty->termios.c_lflag &= ~ECHO;
 629
 630         tty->driver_data = acm;
 631
 632         return 0;
 633
 634 error_init_termios:
 635         tty_port_put(&acm->port);
 636         return retval;
 637 }
 638
 639 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 640 {
 641         struct acm *acm = tty->driver_data;
 642
 643         return tty_port_open(&acm->port, tty, filp);
 644 }
 645
 646 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 647 {
 648         struct acm *acm = container_of(port, struct acm, port);
 649         int val;
 650         int res;
 651
 652         if (raise)
 653                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 654         else
 655                 val = 0;
 656
 657         /* FIXME: add missing ctrlout locking throughout driver */
 658         acm->ctrlout = val;
 659
 660         res = acm_set_control(acm, val);
 661         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 662                 /* This is broken in too many devices to spam the logs */
 663                 dev_dbg(&acm->control->dev, "failed to set dtr/rts\n");
 664 }
 665
 666 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 667 {
 668         struct acm *acm = container_of(port, struct acm, port);
 669         int retval = -ENODEV;
 670         int i;
 671
 672         mutex_lock(&acm->mutex);
 673         if (acm->disconnected)
 674                 goto disconnected;
 675
 676         retval = usb_autopm_get_interface(acm->control);
 677         if (retval)
 678                 goto error_get_interface;
 679
 680         /*
 681          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 682          * memory is really nasty...
 683          */
 684         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 685         acm->control->needs_remote_wakeup = 1;
 686
 687         acm->ctrlurb->dev = acm->dev;
 688         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 689         if (retval) {
 690                 dev_err(&acm->control->dev,
 691                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 692                 goto error_submit_urb;
 693         }
 694
 695         acm_tty_set_termios(tty, NULL);
 696
 697         /*
 698          * Unthrottle device in case the TTY was closed while throttled.
 699          */
 700         clear_bit(ACM_THROTTLED, &acm->flags);
 701
 702         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 703         if (retval)
 704                 goto error_submit_read_urbs;
 705
 706         usb_autopm_put_interface(acm->control);
 707
 708         mutex_unlock(&acm->mutex);
 709
 710         return 0;
 711
 712 error_submit_read_urbs:
 713         for (i = 0; i < acm->rx_buflimit; i++)
 714                 usb_kill_urb(acm->read_urbs[i]);
 715         usb_kill_urb(acm->ctrlurb);
 716 error_submit_urb:
 717         usb_autopm_put_interface(acm->control);
 718 error_get_interface:
 719 disconnected:
 720         mutex_unlock(&acm->mutex);
 721
 722         return usb_translate_errors(retval);
 723 }
 724
 725 static void acm_port_destruct(struct tty_port *port)
 726 {
 727         struct acm *acm = container_of(port, struct acm, port);
 728
 729         acm_release_minor(acm);
 730         usb_put_intf(acm->control);
 731         kfree(acm->country_codes);
 732         kfree(acm);
 733 }
 734
 735 static void acm_port_shutdown(struct tty_port *port)
 736 {
 737         struct acm *acm = container_of(port, struct acm, port);
 738         struct urb *urb;
 739         struct acm_wb *wb;
 740
 741         /*
 742          * Need to grab write_lock to prevent race with resume, but no need to
 743          * hold it due to the tty-port initialised flag.
 744          */
 745         acm_poison_urbs(acm);
 746         spin_lock_irq(&acm->write_lock);
 747         spin_unlock_irq(&acm->write_lock);
 748
 749         usb_autopm_get_interface_no_resume(acm->control);
 750         acm->control->needs_remote_wakeup = 0;
 751         usb_autopm_put_interface(acm->control);
 752
 753         for (;;) {
 754                 urb = usb_get_from_anchor(&acm->delayed);
 755                 if (!urb)
 756                         break;
 757                 wb = urb->context;
 758                 wb->use = false;
 759                 usb_autopm_put_interface_async(acm->control);
 760         }
 761
 762         acm_unpoison_urbs(acm);
 763
 764 }
 765
 766 static void acm_tty_cleanup(struct tty_struct *tty)
 767 {
 768         struct acm *acm = tty->driver_data;
 769
 770         tty_port_put(&acm->port);
 771 }
 772
 773 static void acm_tty_hangup(struct tty_struct *tty)
 774 {
 775         struct acm *acm = tty->driver_data;
 776
 777         tty_port_hangup(&acm->port);
 778 }
 779
 780 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 781 {
 782         struct acm *acm = tty->driver_data;
 783
 784         tty_port_close(&acm->port, tty, filp);
 785 }
 786
 787 static int acm_tty_write(struct tty_struct *tty,
 788                                         const unsigned char *buf, int count)
 789 {
 790         struct acm *acm = tty->driver_data;
 791         int stat;
 792         unsigned long flags;
 793         int wbn;
 794         struct acm_wb *wb;
 795
 796         if (!count)
 797                 return 0;
 798
 799         dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
 800
 801         spin_lock_irqsave(&acm->write_lock, flags);
 802         wbn = acm_wb_alloc(acm);
 803         if (wbn < 0) {
 804                 spin_unlock_irqrestore(&acm->write_lock, flags);
 805                 return 0;
 806         }
 807         wb = &acm->wb[wbn];
 808
 809         if (!acm->dev) {
 810                 wb->use = false;
 811                 spin_unlock_irqrestore(&acm->write_lock, flags);
 812                 return -ENODEV;
 813         }
 814
 815         count = (count > acm->writesize) ? acm->writesize : count;
 816         dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
 817         memcpy(wb->buf, buf, count);
 818         wb->len = count;
 819
 820         stat = usb_autopm_get_interface_async(acm->control);
 821         if (stat) {
 822                 wb->use = false;
 823                 spin_unlock_irqrestore(&acm->write_lock, flags);
 824                 return stat;
 825         }
 826
 827         if (acm->susp_count) {
 828                 usb_anchor_urb(wb->urb, &acm->delayed);
 829                 spin_unlock_irqrestore(&acm->write_lock, flags);
 830                 return count;
 831         }
 832
 833         stat = acm_start_wb(acm, wb);
 834         spin_unlock_irqrestore(&acm->write_lock, flags);
 835
 836         if (stat < 0)
 837                 return stat;
 838         return count;
 839 }
 840
 841 static int acm_tty_write_room(struct tty_struct *tty)
 842 {
 843         struct acm *acm = tty->driver_data;
 844         /*
 845          * Do not let the line discipline to know that we have a reserve,
 846          * or it might get too enthusiastic.
 847          */
 848         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 849 }
 850
 851 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 852 {
 853         struct acm *acm = tty->driver_data;
 854         /*
 855          * if the device was unplugged then any remaining characters fell out
 856          * of the connector ;)
 857          */
 858         if (acm->disconnected)
 859                 return 0;
 860         /*
 861          * This is inaccurate (overcounts), but it works.
 862          */
 863         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 864 }
 865
 866 static void acm_tty_throttle(struct tty_struct *tty)
 867 {
 868         struct acm *acm = tty->driver_data;
 869
 870         set_bit(ACM_THROTTLED, &acm->flags);
 871 }
 872
 873 static void acm_tty_unthrottle(struct tty_struct *tty)
 874 {
 875         struct acm *acm = tty->driver_data;
 876
 877         clear_bit(ACM_THROTTLED, &acm->flags);
 878
 879         /* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
 880         smp_mb();
 881
 882         acm_submit_read_urbs(acm, GFP_KERNEL);
 883 }
 884
 885 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 886 {
 887         struct acm *acm = tty->driver_data;
 888         int retval;
 889
 890         retval = acm_send_break(acm, state ? 0xffff : 0);
 891         if (retval < 0)
 892                 dev_dbg(&acm->control->dev,
 893                         "%s - send break failed\n", __func__);
 894         return retval;
 895 }
 896
 897 static int acm_tty_tiocmget(struct tty_struct *tty)
 898 {
 899         struct acm *acm = tty->driver_data;
 900
 901         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 902                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 903                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 904                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 905                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 906                TIOCM_CTS;
 907 }
 908
 909 static int acm_tty_tiocmset(struct tty_struct *tty,
 910                             unsigned int set, unsigned int clear)
 911 {
 912         struct acm *acm = tty->driver_data;
 913         unsigned int newctrl;
 914
 915         newctrl = acm->ctrlout;
 916         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 917                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 918         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 919                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 920
 921         newctrl = (newctrl & ~clear) | set;
 922
 923         if (acm->ctrlout == newctrl)
 924                 return 0;
 925         return acm_set_control(acm, acm->ctrlout = newctrl);
 926 }
 927
 928 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 929 {
 930         struct acm *acm = tty->driver_data;
 931
 932         ss->line = acm->minor;
 933         ss->close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
 934         ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 935                                 ASYNC_CLOSING_WAIT_NONE :
 936                                 jiffies_to_msecs(acm->port.closing_wait) / 10;
 937         return 0;
 938 }
 939
 940 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 941 {
 942         struct acm *acm = tty->driver_data;
 943         unsigned int closing_wait, close_delay;
 944         int retval = 0;
 945
 946         close_delay = msecs_to_jiffies(ss->close_delay * 10);
 947         closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 948                         ASYNC_CLOSING_WAIT_NONE :
 949                         msecs_to_jiffies(ss->closing_wait * 10);
 950
 951         mutex_lock(&acm->port.mutex);
 952
 953         if (!capable(CAP_SYS_ADMIN)) {
 954                 if ((close_delay != acm->port.close_delay) ||
 955                     (closing_wait != acm->port.closing_wait))
 956                         retval = -EPERM;
 957         } else {
 958                 acm->port.close_delay  = close_delay;
 959                 acm->port.closing_wait = closing_wait;
 960         }
 961
 962         mutex_unlock(&acm->port.mutex);
 963         return retval;
 964 }
 965
 966 static int wait_serial_change(struct acm *acm, unsigned long arg)
 967 {
 968         int rv = 0;
 969         DECLARE_WAITQUEUE(wait, current);
 970         struct async_icount old, new;
 971
 972         do {
 973                 spin_lock_irq(&acm->read_lock);
 974                 old = acm->oldcount;
 975                 new = acm->iocount;
 976                 acm->oldcount = new;
 977                 spin_unlock_irq(&acm->read_lock);
 978
 979                 if ((arg & TIOCM_DSR) &&
 980                         old.dsr != new.dsr)
 981                         break;
 982                 if ((arg & TIOCM_CD)  &&
 983                         old.dcd != new.dcd)
 984                         break;
 985                 if ((arg & TIOCM_RI) &&
 986                         old.rng != new.rng)
 987                         break;
 988
 989                 add_wait_queue(&acm->wioctl, &wait);
 990                 set_current_state(TASK_INTERRUPTIBLE);
 991                 schedule();
 992                 remove_wait_queue(&acm->wioctl, &wait);
 993                 if (acm->disconnected) {
 994                         if (arg & TIOCM_CD)
 995                                 break;
 996                         else
 997                                 rv = -ENODEV;
 998                 } else {
 999                         if (signal_pending(current))
1000                                 rv = -ERESTARTSYS;
1001                 }
1002         } while (!rv);
1003
1004
1005
1006         return rv;
1007 }
1008
1009 static int acm_tty_get_icount(struct tty_struct *tty,
1010                                         struct serial_icounter_struct *icount)
1011 {
1012         struct acm *acm = tty->driver_data;
1013
1014         icount->dsr = acm->iocount.dsr;
1015         icount->rng = acm->iocount.rng;
1016         icount->dcd = acm->iocount.dcd;
1017         icount->frame = acm->iocount.frame;
1018         icount->overrun = acm->iocount.overrun;
1019         icount->parity = acm->iocount.parity;
1020         icount->brk = acm->iocount.brk;
1021
1022         return 0;
1023 }
1024
1025 static int acm_tty_ioctl(struct tty_struct *tty,
1026                                         unsigned int cmd, unsigned long arg)
1027 {
1028         struct acm *acm = tty->driver_data;
1029         int rv = -ENOIOCTLCMD;
1030
1031         switch (cmd) {
1032         case TIOCMIWAIT:
1033                 rv = usb_autopm_get_interface(acm->control);
1034                 if (rv < 0) {
1035                         rv = -EIO;
1036                         break;
1037                 }
1038                 rv = wait_serial_change(acm, arg);
1039                 usb_autopm_put_interface(acm->control);
1040                 break;
1041         }
1042
1043         return rv;
1044 }
1045
1046 static void acm_tty_set_termios(struct tty_struct *tty,
1047                                                 struct ktermios *termios_old)
1048 {
1049         struct acm *acm = tty->driver_data;
1050         struct ktermios *termios = &tty->termios;
1051         struct usb_cdc_line_coding newline;
1052         int newctrl = acm->ctrlout;
1053
1054         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1055         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1056         newline.bParityType = termios->c_cflag & PARENB ?
1057                                 (termios->c_cflag & PARODD ? 1 : 2) +
1058                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1059         switch (termios->c_cflag & CSIZE) {
1060         case CS5:
1061                 newline.bDataBits = 5;
1062                 break;
1063         case CS6:
1064                 newline.bDataBits = 6;
1065                 break;
1066         case CS7:
1067                 newline.bDataBits = 7;
1068                 break;
1069         case CS8:
1070         default:
1071                 newline.bDataBits = 8;
1072                 break;
1073         }
1074         /* FIXME: Needs to clear unsupported bits in the termios */
1075         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1076
1077         if (C_BAUD(tty) == B0) {
1078                 newline.dwDTERate = acm->line.dwDTERate;
1079                 newctrl &= ~ACM_CTRL_DTR;
1080         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1081                 newctrl |=  ACM_CTRL_DTR;
1082         }
1083
1084         if (newctrl != acm->ctrlout)
1085                 acm_set_control(acm, acm->ctrlout = newctrl);
1086
1087         if (memcmp(&acm->line, &newline, sizeof newline)) {
1088                 memcpy(&acm->line, &newline, sizeof newline);
1089                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1090                         __func__,
1091                         le32_to_cpu(newline.dwDTERate),
1092                         newline.bCharFormat, newline.bParityType,
1093                         newline.bDataBits);
1094                 acm_set_line(acm, &acm->line);
1095         }
1096 }
1097
1098 static const struct tty_port_operations acm_port_ops = {
1099         .dtr_rts = acm_port_dtr_rts,
1100         .shutdown = acm_port_shutdown,
1101         .activate = acm_port_activate,
1102         .destruct = acm_port_destruct,
1103 };
1104
1105 /*
1106  * USB probe and disconnect routines.
1107  */
1108
1109 /* Little helpers: write/read buffers free */
1110 static void acm_write_buffers_free(struct acm *acm)
1111 {
1112         int i;
1113         struct acm_wb *wb;
1114
1115         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1116                 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1117 }
1118
1119 static void acm_read_buffers_free(struct acm *acm)
1120 {
1121         int i;
1122
1123         for (i = 0; i < acm->rx_buflimit; i++)
1124                 usb_free_coherent(acm->dev, acm->readsize,
1125                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1126 }
1127
1128 /* Little helper: write buffers allocate */
1129 static int acm_write_buffers_alloc(struct acm *acm)
1130 {
1131         int i;
1132         struct acm_wb *wb;
1133
1134         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1135                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1136                     &wb->dmah);
1137                 if (!wb->buf) {
1138                         while (i != 0) {
1139                                 --i;
1140                                 --wb;
1141                                 usb_free_coherent(acm->dev, acm->writesize,
1142                                     wb->buf, wb->dmah);
1143                         }
1144                         return -ENOMEM;
1145                 }
1146         }
1147         return 0;
1148 }
1149
1150 static int acm_probe(struct usb_interface *intf,
1151                      const struct usb_device_id *id)
1152 {
1153         struct usb_cdc_union_desc *union_header = NULL;
1154         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1155         unsigned char *buffer = intf->altsetting->extra;
1156         int buflen = intf->altsetting->extralen;
1157         struct usb_interface *control_interface;
1158         struct usb_interface *data_interface;
1159         struct usb_endpoint_descriptor *epctrl = NULL;
1160         struct usb_endpoint_descriptor *epread = NULL;
1161         struct usb_endpoint_descriptor *epwrite = NULL;
1162         struct usb_device *usb_dev = interface_to_usbdev(intf);
1163         struct usb_cdc_parsed_header h;
1164         struct acm *acm;
1165         int minor;
1166         int ctrlsize, readsize;
1167         u8 *buf;
1168         int call_intf_num = -1;
1169         int data_intf_num = -1;
1170         unsigned long quirks;
1171         int num_rx_buf;
1172         int i;
1173         int combined_interfaces = 0;
1174         struct device *tty_dev;
1175         int rv = -ENOMEM;
1176         int res;
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 (!buflen) {
1205                 if (intf->cur_altsetting->endpoint &&
1206                                 intf->cur_altsetting->endpoint->extralen &&
1207                                 intf->cur_altsetting->endpoint->extra) {
1208                         dev_dbg(&intf->dev,
1209                                 "Seeking extra descriptors on endpoint\n");
1210                         buflen = intf->cur_altsetting->endpoint->extralen;
1211                         buffer = intf->cur_altsetting->endpoint->extra;
1212                 } else {
1213                         dev_err(&intf->dev,
1214                                 "Zero length descriptor references\n");
1215                         return -EINVAL;
1216                 }
1217         }
1218
1219         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1220         union_header = h.usb_cdc_union_desc;
1221         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1222         if (cmgmd)
1223                 call_intf_num = cmgmd->bDataInterface;
1224
1225         if (!union_header) {
1226                 if (intf->cur_altsetting->desc.bNumEndpoints == 3) {
1227                         dev_dbg(&intf->dev, "No union descriptor, assuming single interface\n");
1228                         combined_interfaces = 1;
1229                         control_interface = data_interface = intf;
1230                         goto look_for_collapsed_interface;
1231                 } else if (call_intf_num > 0) {
1232                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1233                         data_intf_num = call_intf_num;
1234                         data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1235                         control_interface = intf;
1236                 } else {
1237                         dev_dbg(&intf->dev, "No union descriptor, giving up\n");
1238                         return -ENODEV;
1239                 }
1240         } else {
1241                 int class = -1;
1242
1243                 data_intf_num = union_header->bSlaveInterface0;
1244                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1245                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1246
1247                 if (control_interface)
1248                         class = control_interface->cur_altsetting->desc.bInterfaceClass;
1249
1250                 if (class != USB_CLASS_COMM && class != USB_CLASS_CDC_DATA) {
1251                         dev_dbg(&intf->dev, "Broken union descriptor, assuming single interface\n");
1252                         combined_interfaces = 1;
1253                         control_interface = data_interface = intf;
1254                         goto look_for_collapsed_interface;
1255                 }
1256         }
1257
1258         if (!control_interface || !data_interface) {
1259                 dev_dbg(&intf->dev, "no interfaces\n");
1260                 return -ENODEV;
1261         }
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                 }
1276 look_for_collapsed_interface:
1277                 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1278                                 &epread, &epwrite, &epctrl, NULL);
1279                 if (res)
1280                         return res;
1281
1282                 goto made_compressed_probe;
1283         }
1284
1285 skip_normal_probe:
1286
1287         /*workaround for switched interfaces */
1288         if (data_interface->cur_altsetting->desc.bInterfaceClass != USB_CLASS_CDC_DATA) {
1289                 if (control_interface->cur_altsetting->desc.bInterfaceClass == USB_CLASS_CDC_DATA) {
1290                         dev_dbg(&intf->dev,
1291                                 "Your device has switched interfaces.\n");
1292                         swap(control_interface, data_interface);
1293                 } else {
1294                         return -EINVAL;
1295                 }
1296         }
1297
1298         /* Accept probe requests only for the control interface */
1299         if (!combined_interfaces && intf != control_interface)
1300                 return -ENODEV;
1301
1302         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1303             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1304                 return -EINVAL;
1305
1306         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1307         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1308         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1309
1310
1311         /* workaround for switched endpoints */
1312         if (!usb_endpoint_dir_in(epread)) {
1313                 /* descriptors are swapped */
1314                 dev_dbg(&intf->dev,
1315                         "The data interface has switched endpoints\n");
1316                 swap(epread, epwrite);
1317         }
1318 made_compressed_probe:
1319         dev_dbg(&intf->dev, "interfaces are valid\n");
1320
1321         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1322         if (!acm)
1323                 return -ENOMEM;
1324
1325         tty_port_init(&acm->port);
1326         acm->port.ops = &acm_port_ops;
1327
1328         ctrlsize = usb_endpoint_maxp(epctrl);
1329         readsize = usb_endpoint_maxp(epread) *
1330                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1331         acm->combined_interfaces = combined_interfaces;
1332         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1333         acm->control = control_interface;
1334         acm->data = data_interface;
1335
1336         usb_get_intf(acm->control); /* undone in destruct() */
1337
1338         minor = acm_alloc_minor(acm);
1339         if (minor < 0)
1340                 goto err_put_port;
1341
1342         acm->minor = minor;
1343         acm->dev = usb_dev;
1344         if (h.usb_cdc_acm_descriptor)
1345                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1346         if (quirks & NO_CAP_LINE)
1347                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1348         acm->ctrlsize = ctrlsize;
1349         acm->readsize = readsize;
1350         acm->rx_buflimit = num_rx_buf;
1351         INIT_DELAYED_WORK(&acm->dwork, acm_softint);
1352         init_waitqueue_head(&acm->wioctl);
1353         spin_lock_init(&acm->write_lock);
1354         spin_lock_init(&acm->read_lock);
1355         mutex_init(&acm->mutex);
1356         if (usb_endpoint_xfer_int(epread)) {
1357                 acm->bInterval = epread->bInterval;
1358                 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1359         } else {
1360                 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1361         }
1362         if (usb_endpoint_xfer_int(epwrite))
1363                 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1364         else
1365                 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1366         init_usb_anchor(&acm->delayed);
1367         acm->quirks = quirks;
1368
1369         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1370         if (!buf)
1371                 goto err_put_port;
1372         acm->ctrl_buffer = buf;
1373
1374         if (acm_write_buffers_alloc(acm) < 0)
1375                 goto err_free_ctrl_buffer;
1376
1377         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1378         if (!acm->ctrlurb)
1379                 goto err_free_write_buffers;
1380
1381         for (i = 0; i < num_rx_buf; i++) {
1382                 struct acm_rb *rb = &(acm->read_buffers[i]);
1383                 struct urb *urb;
1384
1385                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1386                                                                 &rb->dma);
1387                 if (!rb->base)
1388                         goto err_free_read_urbs;
1389                 rb->index = i;
1390                 rb->instance = acm;
1391
1392                 urb = usb_alloc_urb(0, GFP_KERNEL);
1393                 if (!urb)
1394                         goto err_free_read_urbs;
1395
1396                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1397                 urb->transfer_dma = rb->dma;
1398                 if (usb_endpoint_xfer_int(epread))
1399                         usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1400                                          acm->readsize,
1401                                          acm_read_bulk_callback, rb,
1402                                          acm->bInterval);
1403                 else
1404                         usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1405                                           acm->readsize,
1406                                           acm_read_bulk_callback, rb);
1407
1408                 acm->read_urbs[i] = urb;
1409                 __set_bit(i, &acm->read_urbs_free);
1410         }
1411         for (i = 0; i < ACM_NW; i++) {
1412                 struct acm_wb *snd = &(acm->wb[i]);
1413
1414                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1415                 if (!snd->urb)
1416                         goto err_free_write_urbs;
1417
1418                 if (usb_endpoint_xfer_int(epwrite))
1419                         usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1420                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1421                 else
1422                         usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1423                                 NULL, acm->writesize, acm_write_bulk, snd);
1424                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1425                 if (quirks & SEND_ZERO_PACKET)
1426                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1427                 snd->instance = acm;
1428         }
1429
1430         usb_set_intfdata(intf, acm);
1431
1432         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1433         if (i < 0)
1434                 goto err_free_write_urbs;
1435
1436         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1437                 struct usb_cdc_country_functional_desc * cfd =
1438                                         h.usb_cdc_country_functional_desc;
1439
1440                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1441                 if (!acm->country_codes)
1442                         goto skip_countries;
1443                 acm->country_code_size = cfd->bLength - 4;
1444                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1445                                                         cfd->bLength - 4);
1446                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1447
1448                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1449                 if (i < 0) {
1450                         kfree(acm->country_codes);
1451                         acm->country_codes = NULL;
1452                         acm->country_code_size = 0;
1453                         goto skip_countries;
1454                 }
1455
1456                 i = device_create_file(&intf->dev,
1457                                                 &dev_attr_iCountryCodeRelDate);
1458                 if (i < 0) {
1459                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1460                         kfree(acm->country_codes);
1461                         acm->country_codes = NULL;
1462                         acm->country_code_size = 0;
1463                         goto skip_countries;
1464                 }
1465         }
1466
1467 skip_countries:
1468         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1469                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1470                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1471                          /* works around buggy devices */
1472                          epctrl->bInterval ? epctrl->bInterval : 16);
1473         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1474         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1475         acm->notification_buffer = NULL;
1476         acm->nb_index = 0;
1477         acm->nb_size = 0;
1478
1479         acm->line.dwDTERate = cpu_to_le32(9600);
1480         acm->line.bDataBits = 8;
1481         acm_set_line(acm, &acm->line);
1482
1483         if (!acm->combined_interfaces) {
1484                 rv = usb_driver_claim_interface(&acm_driver, data_interface, acm);
1485                 if (rv)
1486                         goto err_remove_files;
1487         }
1488
1489         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1490                         &control_interface->dev);
1491         if (IS_ERR(tty_dev)) {
1492                 rv = PTR_ERR(tty_dev);
1493                 goto err_release_data_interface;
1494         }
1495
1496         if (quirks & CLEAR_HALT_CONDITIONS) {
1497                 usb_clear_halt(usb_dev, acm->in);
1498                 usb_clear_halt(usb_dev, acm->out);
1499         }
1500
1501         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1502
1503         return 0;
1504
1505 err_release_data_interface:
1506         if (!acm->combined_interfaces) {
1507                 /* Clear driver data so that disconnect() returns early. */
1508                 usb_set_intfdata(data_interface, NULL);
1509                 usb_driver_release_interface(&acm_driver, data_interface);
1510         }
1511 err_remove_files:
1512         if (acm->country_codes) {
1513                 device_remove_file(&acm->control->dev,
1514                                 &dev_attr_wCountryCodes);
1515                 device_remove_file(&acm->control->dev,
1516                                 &dev_attr_iCountryCodeRelDate);
1517         }
1518         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1519 err_free_write_urbs:
1520         for (i = 0; i < ACM_NW; i++)
1521                 usb_free_urb(acm->wb[i].urb);
1522 err_free_read_urbs:
1523         for (i = 0; i < num_rx_buf; i++)
1524                 usb_free_urb(acm->read_urbs[i]);
1525         acm_read_buffers_free(acm);
1526         usb_free_urb(acm->ctrlurb);
1527 err_free_write_buffers:
1528         acm_write_buffers_free(acm);
1529 err_free_ctrl_buffer:
1530         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1531 err_put_port:
1532         tty_port_put(&acm->port);
1533
1534         return rv;
1535 }
1536
1537 static void acm_disconnect(struct usb_interface *intf)
1538 {
1539         struct acm *acm = usb_get_intfdata(intf);
1540         struct tty_struct *tty;
1541         int i;
1542
1543         /* sibling interface is already cleaning up */
1544         if (!acm)
1545                 return;
1546
1547         acm->disconnected = true;
1548         /*
1549          * there is a circular dependency. acm_softint() can resubmit
1550          * the URBs in error handling so we need to block any
1551          * submission right away
1552          */
1553         acm_poison_urbs(acm);
1554         mutex_lock(&acm->mutex);
1555         if (acm->country_codes) {
1556                 device_remove_file(&acm->control->dev,
1557                                 &dev_attr_wCountryCodes);
1558                 device_remove_file(&acm->control->dev,
1559                                 &dev_attr_iCountryCodeRelDate);
1560         }
1561         wake_up_all(&acm->wioctl);
1562         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1563         usb_set_intfdata(acm->control, NULL);
1564         usb_set_intfdata(acm->data, NULL);
1565         mutex_unlock(&acm->mutex);
1566
1567         tty = tty_port_tty_get(&acm->port);
1568         if (tty) {
1569                 tty_vhangup(tty);
1570                 tty_kref_put(tty);
1571         }
1572
1573         cancel_delayed_work_sync(&acm->dwork);
1574
1575         tty_unregister_device(acm_tty_driver, acm->minor);
1576
1577         usb_free_urb(acm->ctrlurb);
1578         for (i = 0; i < ACM_NW; i++)
1579                 usb_free_urb(acm->wb[i].urb);
1580         for (i = 0; i < acm->rx_buflimit; i++)
1581                 usb_free_urb(acm->read_urbs[i]);
1582         acm_write_buffers_free(acm);
1583         usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1584         acm_read_buffers_free(acm);
1585
1586         kfree(acm->notification_buffer);
1587
1588         if (!acm->combined_interfaces)
1589                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1590                                         acm->data : acm->control);
1591
1592         tty_port_put(&acm->port);
1593 }
1594
1595 #ifdef CONFIG_PM
1596 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1597 {
1598         struct acm *acm = usb_get_intfdata(intf);
1599         int cnt;
1600
1601         spin_lock_irq(&acm->write_lock);
1602         if (PMSG_IS_AUTO(message)) {
1603                 if (acm->transmitting) {
1604                         spin_unlock_irq(&acm->write_lock);
1605                         return -EBUSY;
1606                 }
1607         }
1608         cnt = acm->susp_count++;
1609         spin_unlock_irq(&acm->write_lock);
1610
1611         if (cnt)
1612                 return 0;
1613
1614         acm_poison_urbs(acm);
1615         cancel_delayed_work_sync(&acm->dwork);
1616         acm->urbs_in_error_delay = 0;
1617
1618         return 0;
1619 }
1620
1621 static int acm_resume(struct usb_interface *intf)
1622 {
1623         struct acm *acm = usb_get_intfdata(intf);
1624         struct urb *urb;
1625         int rv = 0;
1626
1627         spin_lock_irq(&acm->write_lock);
1628
1629         if (--acm->susp_count)
1630                 goto out;
1631
1632         acm_unpoison_urbs(acm);
1633
1634         if (tty_port_initialized(&acm->port)) {
1635                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1636
1637                 for (;;) {
1638                         urb = usb_get_from_anchor(&acm->delayed);
1639                         if (!urb)
1640                                 break;
1641
1642                         acm_start_wb(acm, urb->context);
1643                 }
1644
1645                 /*
1646                  * delayed error checking because we must
1647                  * do the write path at all cost
1648                  */
1649                 if (rv < 0)
1650                         goto out;
1651
1652                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1653         }
1654 out:
1655         spin_unlock_irq(&acm->write_lock);
1656
1657         return rv;
1658 }
1659
1660 static int acm_reset_resume(struct usb_interface *intf)
1661 {
1662         struct acm *acm = usb_get_intfdata(intf);
1663
1664         if (tty_port_initialized(&acm->port))
1665                 tty_port_tty_hangup(&acm->port, false);
1666
1667         return acm_resume(intf);
1668 }
1669
1670 #endif /* CONFIG_PM */
1671
1672 static int acm_pre_reset(struct usb_interface *intf)
1673 {
1674         struct acm *acm = usb_get_intfdata(intf);
1675
1676         clear_bit(EVENT_RX_STALL, &acm->flags);
1677         acm->nb_index = 0; /* pending control transfers are lost */
1678
1679         return 0;
1680 }
1681
1682 #define NOKIA_PCSUITE_ACM_INFO(x) \
1683                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1684                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1685                 USB_CDC_ACM_PROTO_VENDOR)
1686
1687 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1688                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1689                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1690                 USB_CDC_ACM_PROTO_VENDOR)
1691
1692 /*
1693  * USB driver structure.
1694  */
1695
1696 static const struct usb_device_id acm_ids[] = {
1697         /* quirky and broken devices */
1698         { USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1699           .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
1700         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1701         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1702         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1703         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1704         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1705         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1706         },
1707         { USB_DEVICE(0x045b, 0x023c),   /* Renesas USB Download mode */
1708         .driver_info = DISABLE_ECHO,    /* Don't echo banner */
1709         },
1710         { USB_DEVICE(0x045b, 0x0248),   /* Renesas USB Download mode */
1711         .driver_info = DISABLE_ECHO,    /* Don't echo banner */
1712         },
1713         { USB_DEVICE(0x045b, 0x024D),   /* Renesas USB Download mode */
1714         .driver_info = DISABLE_ECHO,    /* Don't echo banner */
1715         },
1716         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1717         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1718         },
1719         { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1720         .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1721         },
1722         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1723         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1724         },
1725         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1726         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1727         },
1728         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1729         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1730         },
1731         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1732         .driver_info = SINGLE_RX_URB,
1733         },
1734         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1735         .driver_info = SINGLE_RX_URB, /* firmware bug */
1736         },
1737         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1738         .driver_info = SINGLE_RX_URB, /* firmware bug */
1739         },
1740         { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1741         .driver_info = SINGLE_RX_URB,
1742         },
1743         { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1744         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1745         },
1746         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1747         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1748         },
1749         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1750         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1751         },
1752         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1753         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1754         },
1755         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1756         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1757         },
1758         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1759         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1760         },
1761         { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1762         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1763         },
1764         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1765         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1766         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1767         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1768         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1769         },
1770         /* Motorola H24 HSPA module: */
1771         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1772         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1773         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1774         },
1775         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1776         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1777         },
1778         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1779         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1780         },
1781         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1782         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1783         },
1784         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1785         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1786         },
1787         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1788         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1789         },
1790         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1791         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1792         },
1793
1794         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1795         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1796                                            data interface instead of
1797                                            communications interface.
1798                                            Maybe we should define a new
1799                                            quirk for this. */
1800         },
1801         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1802         .driver_info = NO_UNION_NORMAL,
1803         },
1804         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1805         .driver_info = NO_UNION_NORMAL,
1806         },
1807         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1808         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1809         },
1810         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1811         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1812         },
1813         { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1814         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1815         },
1816         { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1817         .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1818         },
1819         { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1820         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1821         },
1822
1823         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1824         .driver_info = CLEAR_HALT_CONDITIONS,
1825         },
1826
1827         /* Nokia S60 phones expose two ACM channels. The first is
1828          * a modem and is picked up by the standard AT-command
1829          * information below. The second is 'vendor-specific' but
1830          * is treated as a serial device at the S60 end, so we want
1831          * to expose it on Linux too. */
1832         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1833         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1834         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1835         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1836         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1837         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1838         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1839         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1840         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1841         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1842         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1843         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1844         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1845         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1846         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1847         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1848         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1849         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1850         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1851         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1852         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1853         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1854         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1855         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1856         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1857         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1858         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1859         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1860         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1861         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1862         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1863         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1864         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1865         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1866         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1867         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1868         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1869         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1870         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1871         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1872         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1873         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1874         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1875         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1876         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1877         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1878         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1879         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1880         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1881         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1882         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1883         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1884         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1885         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1886         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1887         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1888         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1889         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1890
1891         /* Support for Owen devices */
1892         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1893
1894         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1895
1896 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1897         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1898         .driver_info = IGNORE_DEVICE,
1899         },
1900         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1901         .driver_info = IGNORE_DEVICE,
1902         },
1903 #endif
1904
1905 #if IS_ENABLED(CONFIG_IR_TOY)
1906         { USB_DEVICE(0x04d8, 0xfd08),
1907         .driver_info = IGNORE_DEVICE,
1908         },
1909
1910         { USB_DEVICE(0x04d8, 0xf58b),
1911         .driver_info = IGNORE_DEVICE,
1912         },
1913 #endif
1914
1915 #if IS_ENABLED(CONFIG_USB_SERIAL_XR)
1916         { USB_DEVICE(0x04e2, 0x1400), .driver_info = IGNORE_DEVICE },
1917         { USB_DEVICE(0x04e2, 0x1401), .driver_info = IGNORE_DEVICE },
1918         { USB_DEVICE(0x04e2, 0x1402), .driver_info = IGNORE_DEVICE },
1919         { USB_DEVICE(0x04e2, 0x1403), .driver_info = IGNORE_DEVICE },
1920         { USB_DEVICE(0x04e2, 0x1410), .driver_info = IGNORE_DEVICE },
1921         { USB_DEVICE(0x04e2, 0x1411), .driver_info = IGNORE_DEVICE },
1922         { USB_DEVICE(0x04e2, 0x1412), .driver_info = IGNORE_DEVICE },
1923         { USB_DEVICE(0x04e2, 0x1414), .driver_info = IGNORE_DEVICE },
1924         { USB_DEVICE(0x04e2, 0x1420), .driver_info = IGNORE_DEVICE },
1925         { USB_DEVICE(0x04e2, 0x1422), .driver_info = IGNORE_DEVICE },
1926         { USB_DEVICE(0x04e2, 0x1424), .driver_info = IGNORE_DEVICE },
1927 #endif
1928
1929         /*Samsung phone in firmware update mode */
1930         { USB_DEVICE(0x04e8, 0x685d),
1931         .driver_info = IGNORE_DEVICE,
1932         },
1933
1934         /* Exclude Infineon Flash Loader utility */
1935         { USB_DEVICE(0x058b, 0x0041),
1936         .driver_info = IGNORE_DEVICE,
1937         },
1938
1939         /* Exclude ETAS ES58x */
1940         { USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
1941         .driver_info = IGNORE_DEVICE,
1942         },
1943         { USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
1944         .driver_info = IGNORE_DEVICE,
1945         },
1946         { USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
1947         .driver_info = IGNORE_DEVICE,
1948         },
1949
1950         { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1951         .driver_info = SEND_ZERO_PACKET,
1952         },
1953         { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1954         .driver_info = SEND_ZERO_PACKET,
1955         },
1956
1957         /* Exclude Goodix Fingerprint Reader */
1958         { USB_DEVICE(0x27c6, 0x5395),
1959         .driver_info = IGNORE_DEVICE,
1960         },
1961
1962         /* control interfaces without any protocol set */
1963         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1964                 USB_CDC_PROTO_NONE) },
1965
1966         /* control interfaces with various AT-command sets */
1967         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1968                 USB_CDC_ACM_PROTO_AT_V25TER) },
1969         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1970                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1971         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1972                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1973         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1974                 USB_CDC_ACM_PROTO_AT_GSM) },
1975         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1976                 USB_CDC_ACM_PROTO_AT_3G) },
1977         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1978                 USB_CDC_ACM_PROTO_AT_CDMA) },
1979
1980         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1981         .driver_info = SEND_ZERO_PACKET,
1982         },
1983
1984         { }
1985 };
1986
1987 MODULE_DEVICE_TABLE(usb, acm_ids);
1988
1989 static struct usb_driver acm_driver = {
1990         .name =         "cdc_acm",
1991         .probe =        acm_probe,
1992         .disconnect =   acm_disconnect,
1993 #ifdef CONFIG_PM
1994         .suspend =      acm_suspend,
1995         .resume =       acm_resume,
1996         .reset_resume = acm_reset_resume,
1997 #endif
1998         .pre_reset =    acm_pre_reset,
1999         .id_table =     acm_ids,
2000 #ifdef CONFIG_PM
2001         .supports_autosuspend = 1,
2002 #endif
2003         .disable_hub_initiated_lpm = 1,
2004 };
2005
2006 /*
2007  * TTY driver structures.
2008  */
2009
2010 static const struct tty_operations acm_ops = {
2011         .install =              acm_tty_install,
2012         .open =                 acm_tty_open,
2013         .close =                acm_tty_close,
2014         .cleanup =              acm_tty_cleanup,
2015         .hangup =               acm_tty_hangup,
2016         .write =                acm_tty_write,
2017         .write_room =           acm_tty_write_room,
2018         .ioctl =                acm_tty_ioctl,
2019         .throttle =             acm_tty_throttle,
2020         .unthrottle =           acm_tty_unthrottle,
2021         .chars_in_buffer =      acm_tty_chars_in_buffer,
2022         .break_ctl =            acm_tty_break_ctl,
2023         .set_termios =          acm_tty_set_termios,
2024         .tiocmget =             acm_tty_tiocmget,
2025         .tiocmset =             acm_tty_tiocmset,
2026         .get_serial =           get_serial_info,
2027         .set_serial =           set_serial_info,
2028         .get_icount =           acm_tty_get_icount,
2029 };
2030
2031 /*
2032  * Init / exit.
2033  */
2034
2035 static int __init acm_init(void)
2036 {
2037         int retval;
2038         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
2039         if (!acm_tty_driver)
2040                 return -ENOMEM;
2041         acm_tty_driver->driver_name = "acm",
2042         acm_tty_driver->name = "ttyACM",
2043         acm_tty_driver->major = ACM_TTY_MAJOR,
2044         acm_tty_driver->minor_start = 0,
2045         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2046         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2047         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2048         acm_tty_driver->init_termios = tty_std_termios;
2049         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2050                                                                 HUPCL | CLOCAL;
2051         tty_set_operations(acm_tty_driver, &acm_ops);
2052
2053         retval = tty_register_driver(acm_tty_driver);
2054         if (retval) {
2055                 put_tty_driver(acm_tty_driver);
2056                 return retval;
2057         }
2058
2059         retval = usb_register(&acm_driver);
2060         if (retval) {
2061                 tty_unregister_driver(acm_tty_driver);
2062                 put_tty_driver(acm_tty_driver);
2063                 return retval;
2064         }
2065
2066         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2067
2068         return 0;
2069 }
2070
2071 static void __exit acm_exit(void)
2072 {
2073         usb_deregister(&acm_driver);
2074         tty_unregister_driver(acm_tty_driver);
2075         put_tty_driver(acm_tty_driver);
2076         idr_destroy(&acm_minors);
2077 }
2078
2079 module_init(acm_init);
2080 module_exit(acm_exit);
2081
2082 MODULE_AUTHOR(DRIVER_AUTHOR);
2083 MODULE_DESCRIPTION(DRIVER_DESC);
2084 MODULE_LICENSE("GPL");
2085 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);