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