drivers/usb/class/cdc-acm.c

   1 /*
   2  * cdc-acm.c
   3  *
   4  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
   5  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
   6  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
   7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   8  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
   9  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
  10  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
  11  *
  12  * USB Abstract Control Model driver for USB modems and ISDN adapters
  13  *
  14  * Sponsored by SuSE
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  29  */
  30
  31 #undef DEBUG
  32 #undef VERBOSE_DEBUG
  33
  34 #include <linux/kernel.h>
  35 #include <linux/errno.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/tty.h>
  39 #include <linux/serial.h>
  40 #include <linux/tty_driver.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/module.h>
  43 #include <linux/mutex.h>
  44 #include <linux/uaccess.h>
  45 #include <linux/usb.h>
  46 #include <linux/usb/cdc.h>
  47 #include <asm/byteorder.h>
  48 #include <asm/unaligned.h>
  49 #include <linux/idr.h>
  50 #include <linux/list.h>
  51
  52 #include "cdc-acm.h"
  53
  54
  55 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  56 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  57
  58 static struct usb_driver acm_driver;
  59 static struct tty_driver *acm_tty_driver;
  60
  61 static DEFINE_IDR(acm_minors);
  62 static DEFINE_MUTEX(acm_minors_lock);
  63
  64 static void acm_tty_set_termios(struct tty_struct *tty,
  65                                 struct ktermios *termios_old);
  66
  67 /*
  68  * acm_minors accessors
  69  */
  70
  71 /*
  72  * Look up an ACM structure by minor. If found and not disconnected, increment
  73  * its refcount and return it with its mutex held.
  74  */
  75 static struct acm *acm_get_by_minor(unsigned int minor)
  76 {
  77         struct acm *acm;
  78
  79         mutex_lock(&acm_minors_lock);
  80         acm = idr_find(&acm_minors, minor);
  81         if (acm) {
  82                 mutex_lock(&acm->mutex);
  83                 if (acm->disconnected) {
  84                         mutex_unlock(&acm->mutex);
  85                         acm = NULL;
  86                 } else {
  87                         tty_port_get(&acm->port);
  88                         mutex_unlock(&acm->mutex);
  89                 }
  90         }
  91         mutex_unlock(&acm_minors_lock);
  92         return acm;
  93 }
  94
  95 /*
  96  * Try to find an available minor number and if found, associate it with 'acm'.
  97  */
  98 static int acm_alloc_minor(struct acm *acm)
  99 {
 100         int minor;
 101
 102         mutex_lock(&acm_minors_lock);
 103         minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
 104         mutex_unlock(&acm_minors_lock);
 105
 106         return minor;
 107 }
 108
 109 /* Release the minor number associated with 'acm'.  */
 110 static void acm_release_minor(struct acm *acm)
 111 {
 112         mutex_lock(&acm_minors_lock);
 113         idr_remove(&acm_minors, acm->minor);
 114         mutex_unlock(&acm_minors_lock);
 115 }
 116
 117 /*
 118  * Functions for ACM control messages.
 119  */
 120
 121 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 122                                                         void *buf, int len)
 123 {
 124         int retval;
 125
 126         retval = usb_autopm_get_interface(acm->control);
 127         if (retval)
 128                 return retval;
 129
 130         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 131                 request, USB_RT_ACM, value,
 132                 acm->control->altsetting[0].desc.bInterfaceNumber,
 133                 buf, len, 5000);
 134
 135         dev_dbg(&acm->control->dev,
 136                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 137                         __func__, request, value, len, retval);
 138
 139         usb_autopm_put_interface(acm->control);
 140
 141         return retval < 0 ? retval : 0;
 142 }
 143
 144 /* devices aren't required to support these requests.
 145  * the cdc acm descriptor tells whether they do...
 146  */
 147 static inline int acm_set_control(struct acm *acm, int control)
 148 {
 149         if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
 150                 return -EOPNOTSUPP;
 151
 152         return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
 153                         control, NULL, 0);
 154 }
 155
 156 #define acm_set_line(acm, line) \
 157         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 158 #define acm_send_break(acm, ms) \
 159         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 160
 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                         return wbn;
 178                 }
 179                 wbn = (wbn + 1) % ACM_NW;
 180                 if (++i >= ACM_NW)
 181                         return -1;
 182         }
 183 }
 184
 185 static int acm_wb_is_avail(struct acm *acm)
 186 {
 187         int i, n;
 188         unsigned long flags;
 189
 190         n = ACM_NW;
 191         spin_lock_irqsave(&acm->write_lock, flags);
 192         for (i = 0; i < ACM_NW; i++)
 193                 n -= acm->wb[i].use;
 194         spin_unlock_irqrestore(&acm->write_lock, flags);
 195         return n;
 196 }
 197
 198 /*
 199  * Finish write. Caller must hold acm->write_lock
 200  */
 201 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 202 {
 203         wb->use = 0;
 204         acm->transmitting--;
 205         usb_autopm_put_interface_async(acm->control);
 206 }
 207
 208 /*
 209  * Poke write.
 210  *
 211  * the caller is responsible for locking
 212  */
 213
 214 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 215 {
 216         int rc;
 217
 218         acm->transmitting++;
 219
 220         wb->urb->transfer_buffer = wb->buf;
 221         wb->urb->transfer_dma = wb->dmah;
 222         wb->urb->transfer_buffer_length = wb->len;
 223         wb->urb->dev = acm->dev;
 224
 225         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 226         if (rc < 0) {
 227                 dev_err(&acm->data->dev,
 228                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 229                         __func__, rc);
 230                 acm_write_done(acm, wb);
 231         }
 232         return rc;
 233 }
 234
 235 /*
 236  * attributes exported through sysfs
 237  */
 238 static ssize_t show_caps
 239 (struct device *dev, struct device_attribute *attr, char *buf)
 240 {
 241         struct usb_interface *intf = to_usb_interface(dev);
 242         struct acm *acm = usb_get_intfdata(intf);
 243
 244         return sprintf(buf, "%d", acm->ctrl_caps);
 245 }
 246 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 247
 248 static ssize_t show_country_codes
 249 (struct device *dev, struct device_attribute *attr, char *buf)
 250 {
 251         struct usb_interface *intf = to_usb_interface(dev);
 252         struct acm *acm = usb_get_intfdata(intf);
 253
 254         memcpy(buf, acm->country_codes, acm->country_code_size);
 255         return acm->country_code_size;
 256 }
 257
 258 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 259
 260 static ssize_t show_country_rel_date
 261 (struct device *dev, struct device_attribute *attr, char *buf)
 262 {
 263         struct usb_interface *intf = to_usb_interface(dev);
 264         struct acm *acm = usb_get_intfdata(intf);
 265
 266         return sprintf(buf, "%d", acm->country_rel_date);
 267 }
 268
 269 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 270 /*
 271  * Interrupt handlers for various ACM device responses
 272  */
 273
 274 /* control interface reports status changes with "interrupt" transfers */
 275 static void acm_ctrl_irq(struct urb *urb)
 276 {
 277         struct acm *acm = urb->context;
 278         struct usb_cdc_notification *dr = urb->transfer_buffer;
 279         unsigned char *data;
 280         int newctrl;
 281         int difference;
 282         int retval;
 283         int status = urb->status;
 284
 285         switch (status) {
 286         case 0:
 287                 /* success */
 288                 break;
 289         case -ECONNRESET:
 290         case -ENOENT:
 291         case -ESHUTDOWN:
 292                 /* this urb is terminated, clean up */
 293                 dev_dbg(&acm->control->dev,
 294                                 "%s - urb shutting down with status: %d\n",
 295                                 __func__, status);
 296                 return;
 297         default:
 298                 dev_dbg(&acm->control->dev,
 299                                 "%s - nonzero urb status received: %d\n",
 300                                 __func__, status);
 301                 goto exit;
 302         }
 303
 304         usb_mark_last_busy(acm->dev);
 305
 306         data = (unsigned char *)(dr + 1);
 307         switch (dr->bNotificationType) {
 308         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 309                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
 310                                                         __func__, dr->wValue);
 311                 break;
 312
 313         case USB_CDC_NOTIFY_SERIAL_STATE:
 314                 newctrl = get_unaligned_le16(data);
 315
 316                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 317                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
 318                                         __func__);
 319                         tty_port_tty_hangup(&acm->port, false);
 320                 }
 321
 322                 difference = acm->ctrlin ^ newctrl;
 323                 spin_lock(&acm->read_lock);
 324                 acm->ctrlin = newctrl;
 325                 acm->oldcount = acm->iocount;
 326
 327                 if (difference & ACM_CTRL_DSR)
 328                         acm->iocount.dsr++;
 329                 if (difference & ACM_CTRL_BRK)
 330                         acm->iocount.brk++;
 331                 if (difference & ACM_CTRL_RI)
 332                         acm->iocount.rng++;
 333                 if (difference & ACM_CTRL_DCD)
 334                         acm->iocount.dcd++;
 335                 if (difference & ACM_CTRL_FRAMING)
 336                         acm->iocount.frame++;
 337                 if (difference & ACM_CTRL_PARITY)
 338                         acm->iocount.parity++;
 339                 if (difference & ACM_CTRL_OVERRUN)
 340                         acm->iocount.overrun++;
 341                 spin_unlock(&acm->read_lock);
 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 "
 351                         "len %d data0 %d data1 %d\n",
 352                         __func__,
 353                         dr->bNotificationType, dr->wIndex,
 354                         dr->wLength, data[0], data[1]);
 355                 break;
 356         }
 357 exit:
 358         retval = usb_submit_urb(urb, GFP_ATOMIC);
 359         if (retval && retval != -EPERM)
 360                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 361                                                         __func__, retval);
 362 }
 363
 364 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 365 {
 366         int res;
 367
 368         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 369                 return 0;
 370
 371         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 372         if (res) {
 373                 if (res != -EPERM) {
 374                         dev_err(&acm->data->dev,
 375                                         "urb %d failed submission with %d\n",
 376                                         index, res);
 377                 }
 378                 set_bit(index, &acm->read_urbs_free);
 379                 return res;
 380         } else {
 381                 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 382         }
 383
 384         return 0;
 385 }
 386
 387 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 388 {
 389         int res;
 390         int i;
 391
 392         for (i = 0; i < acm->rx_buflimit; ++i) {
 393                 res = acm_submit_read_urb(acm, i, mem_flags);
 394                 if (res)
 395                         return res;
 396         }
 397
 398         return 0;
 399 }
 400
 401 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 402 {
 403         if (!urb->actual_length)
 404                 return;
 405
 406         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 407                         urb->actual_length);
 408         tty_flip_buffer_push(&acm->port);
 409 }
 410
 411 static void acm_read_bulk_callback(struct urb *urb)
 412 {
 413         struct acm_rb *rb = urb->context;
 414         struct acm *acm = rb->instance;
 415         unsigned long flags;
 416         int status = urb->status;
 417
 418         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
 419                                         rb->index, urb->actual_length);
 420
 421         if (!acm->dev) {
 422                 set_bit(rb->index, &acm->read_urbs_free);
 423                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 424                 return;
 425         }
 426
 427         if (status) {
 428                 set_bit(rb->index, &acm->read_urbs_free);
 429                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
 430                                                         __func__, status);
 431                 if ((status != -ENOENT) || (urb->actual_length == 0))
 432                         return;
 433         }
 434
 435         usb_mark_last_busy(acm->dev);
 436
 437         acm_process_read_urb(acm, urb);
 438         /*
 439          * Unthrottle may run on another CPU which needs to see events
 440          * in the same order. Submission has an implict barrier
 441          */
 442         smp_mb__before_atomic();
 443         set_bit(rb->index, &acm->read_urbs_free);
 444
 445         /* throttle device if requested by tty */
 446         spin_lock_irqsave(&acm->read_lock, flags);
 447         acm->throttled = acm->throttle_req;
 448         if (!acm->throttled) {
 449                 spin_unlock_irqrestore(&acm->read_lock, flags);
 450                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 451         } else {
 452                 spin_unlock_irqrestore(&acm->read_lock, flags);
 453         }
 454 }
 455
 456 /* data interface wrote those outgoing bytes */
 457 static void acm_write_bulk(struct urb *urb)
 458 {
 459         struct acm_wb *wb = urb->context;
 460         struct acm *acm = wb->instance;
 461         unsigned long flags;
 462         int status = urb->status;
 463
 464         if (status || (urb->actual_length != urb->transfer_buffer_length))
 465                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
 466                         __func__,
 467                         urb->actual_length,
 468                         urb->transfer_buffer_length,
 469                         status);
 470
 471         spin_lock_irqsave(&acm->write_lock, flags);
 472         acm_write_done(acm, wb);
 473         spin_unlock_irqrestore(&acm->write_lock, flags);
 474         schedule_work(&acm->work);
 475 }
 476
 477 static void acm_softint(struct work_struct *work)
 478 {
 479         struct acm *acm = container_of(work, struct acm, work);
 480
 481         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 482
 483         tty_port_tty_wakeup(&acm->port);
 484 }
 485
 486 /*
 487  * TTY handlers
 488  */
 489
 490 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 491 {
 492         struct acm *acm;
 493         int retval;
 494
 495         acm = acm_get_by_minor(tty->index);
 496         if (!acm)
 497                 return -ENODEV;
 498
 499         retval = tty_standard_install(driver, tty);
 500         if (retval)
 501                 goto error_init_termios;
 502
 503         tty->driver_data = acm;
 504
 505         return 0;
 506
 507 error_init_termios:
 508         tty_port_put(&acm->port);
 509         return retval;
 510 }
 511
 512 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 513 {
 514         struct acm *acm = tty->driver_data;
 515
 516         return tty_port_open(&acm->port, tty, filp);
 517 }
 518
 519 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 520 {
 521         struct acm *acm = container_of(port, struct acm, port);
 522         int val;
 523         int res;
 524
 525         if (raise)
 526                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 527         else
 528                 val = 0;
 529
 530         /* FIXME: add missing ctrlout locking throughout driver */
 531         acm->ctrlout = val;
 532
 533         res = acm_set_control(acm, val);
 534         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 535                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
 536 }
 537
 538 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 539 {
 540         struct acm *acm = container_of(port, struct acm, port);
 541         int retval = -ENODEV;
 542         int i;
 543
 544         mutex_lock(&acm->mutex);
 545         if (acm->disconnected)
 546                 goto disconnected;
 547
 548         retval = usb_autopm_get_interface(acm->control);
 549         if (retval)
 550                 goto error_get_interface;
 551
 552         /*
 553          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 554          * memory is really nasty...
 555          */
 556         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 557         acm->control->needs_remote_wakeup = 1;
 558
 559         acm->ctrlurb->dev = acm->dev;
 560         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 561         if (retval) {
 562                 dev_err(&acm->control->dev,
 563                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 564                 goto error_submit_urb;
 565         }
 566
 567         acm_tty_set_termios(tty, NULL);
 568
 569         /*
 570          * Unthrottle device in case the TTY was closed while throttled.
 571          */
 572         spin_lock_irq(&acm->read_lock);
 573         acm->throttled = 0;
 574         acm->throttle_req = 0;
 575         spin_unlock_irq(&acm->read_lock);
 576
 577         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 578         if (retval)
 579                 goto error_submit_read_urbs;
 580
 581         usb_autopm_put_interface(acm->control);
 582
 583         mutex_unlock(&acm->mutex);
 584
 585         return 0;
 586
 587 error_submit_read_urbs:
 588         for (i = 0; i < acm->rx_buflimit; i++)
 589                 usb_kill_urb(acm->read_urbs[i]);
 590         usb_kill_urb(acm->ctrlurb);
 591 error_submit_urb:
 592         usb_autopm_put_interface(acm->control);
 593 error_get_interface:
 594 disconnected:
 595         mutex_unlock(&acm->mutex);
 596
 597         return usb_translate_errors(retval);
 598 }
 599
 600 static void acm_port_destruct(struct tty_port *port)
 601 {
 602         struct acm *acm = container_of(port, struct acm, port);
 603
 604         acm_release_minor(acm);
 605         usb_put_intf(acm->control);
 606         kfree(acm->country_codes);
 607         kfree(acm);
 608 }
 609
 610 static void acm_port_shutdown(struct tty_port *port)
 611 {
 612         struct acm *acm = container_of(port, struct acm, port);
 613         struct urb *urb;
 614         struct acm_wb *wb;
 615         int i;
 616
 617         /*
 618          * Need to grab write_lock to prevent race with resume, but no need to
 619          * hold it due to the tty-port initialised flag.
 620          */
 621         spin_lock_irq(&acm->write_lock);
 622         spin_unlock_irq(&acm->write_lock);
 623
 624         usb_autopm_get_interface_no_resume(acm->control);
 625         acm->control->needs_remote_wakeup = 0;
 626         usb_autopm_put_interface(acm->control);
 627
 628         for (;;) {
 629                 urb = usb_get_from_anchor(&acm->delayed);
 630                 if (!urb)
 631                         break;
 632                 wb = urb->context;
 633                 wb->use = 0;
 634                 usb_autopm_put_interface_async(acm->control);
 635         }
 636
 637         usb_kill_urb(acm->ctrlurb);
 638         for (i = 0; i < ACM_NW; i++)
 639                 usb_kill_urb(acm->wb[i].urb);
 640         for (i = 0; i < acm->rx_buflimit; i++)
 641                 usb_kill_urb(acm->read_urbs[i]);
 642 }
 643
 644 static void acm_tty_cleanup(struct tty_struct *tty)
 645 {
 646         struct acm *acm = tty->driver_data;
 647
 648         tty_port_put(&acm->port);
 649 }
 650
 651 static void acm_tty_hangup(struct tty_struct *tty)
 652 {
 653         struct acm *acm = tty->driver_data;
 654
 655         tty_port_hangup(&acm->port);
 656 }
 657
 658 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 659 {
 660         struct acm *acm = tty->driver_data;
 661
 662         tty_port_close(&acm->port, tty, filp);
 663 }
 664
 665 static int acm_tty_write(struct tty_struct *tty,
 666                                         const unsigned char *buf, int count)
 667 {
 668         struct acm *acm = tty->driver_data;
 669         int stat;
 670         unsigned long flags;
 671         int wbn;
 672         struct acm_wb *wb;
 673
 674         if (!count)
 675                 return 0;
 676
 677         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 678
 679         spin_lock_irqsave(&acm->write_lock, flags);
 680         wbn = acm_wb_alloc(acm);
 681         if (wbn < 0) {
 682                 spin_unlock_irqrestore(&acm->write_lock, flags);
 683                 return 0;
 684         }
 685         wb = &acm->wb[wbn];
 686
 687         if (!acm->dev) {
 688                 wb->use = 0;
 689                 spin_unlock_irqrestore(&acm->write_lock, flags);
 690                 return -ENODEV;
 691         }
 692
 693         count = (count > acm->writesize) ? acm->writesize : count;
 694         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 695         memcpy(wb->buf, buf, count);
 696         wb->len = count;
 697
 698         stat = usb_autopm_get_interface_async(acm->control);
 699         if (stat) {
 700                 wb->use = 0;
 701                 spin_unlock_irqrestore(&acm->write_lock, flags);
 702                 return stat;
 703         }
 704
 705         if (acm->susp_count) {
 706                 if (acm->putbuffer) {
 707                         /* now to preserve order */
 708                         usb_anchor_urb(acm->putbuffer->urb, &acm->delayed);
 709                         acm->putbuffer = NULL;
 710                 }
 711                 usb_anchor_urb(wb->urb, &acm->delayed);
 712                 spin_unlock_irqrestore(&acm->write_lock, flags);
 713                 return count;
 714         } else {
 715                 if (acm->putbuffer) {
 716                         /* at this point there is no good way to handle errors */
 717                         acm_start_wb(acm, acm->putbuffer);
 718                         acm->putbuffer = NULL;
 719                 }
 720         }
 721
 722         stat = acm_start_wb(acm, wb);
 723         spin_unlock_irqrestore(&acm->write_lock, flags);
 724
 725         if (stat < 0)
 726                 return stat;
 727         return count;
 728 }
 729
 730 static void acm_tty_flush_chars(struct tty_struct *tty)
 731 {
 732         struct acm *acm = tty->driver_data;
 733         struct acm_wb *cur = acm->putbuffer;
 734         int err;
 735         unsigned long flags;
 736
 737         if (!cur) /* nothing to do */
 738                 return;
 739
 740         acm->putbuffer = NULL;
 741         err = usb_autopm_get_interface_async(acm->control);
 742         spin_lock_irqsave(&acm->write_lock, flags);
 743         if (err < 0) {
 744                 cur->use = 0;
 745                 acm->putbuffer = cur;
 746                 goto out;
 747         }
 748
 749         if (acm->susp_count)
 750                 usb_anchor_urb(cur->urb, &acm->delayed);
 751         else
 752                 acm_start_wb(acm, cur);
 753 out:
 754         spin_unlock_irqrestore(&acm->write_lock, flags);
 755         return;
 756 }
 757
 758 static int acm_tty_put_char(struct tty_struct *tty, unsigned char ch)
 759 {
 760         struct acm *acm = tty->driver_data;
 761         struct acm_wb *cur;
 762         int wbn;
 763         unsigned long flags;
 764
 765 overflow:
 766         cur = acm->putbuffer;
 767         if (!cur) {
 768                 spin_lock_irqsave(&acm->write_lock, flags);
 769                 wbn = acm_wb_alloc(acm);
 770                 if (wbn >= 0) {
 771                         cur = &acm->wb[wbn];
 772                         acm->putbuffer = cur;
 773                 }
 774                 spin_unlock_irqrestore(&acm->write_lock, flags);
 775                 if (!cur)
 776                         return 0;
 777         }
 778
 779         if (cur->len == acm->writesize) {
 780                 acm_tty_flush_chars(tty);
 781                 goto overflow;
 782         }
 783
 784         cur->buf[cur->len++] = ch;
 785         return 1;
 786 }
 787
 788 static int acm_tty_write_room(struct tty_struct *tty)
 789 {
 790         struct acm *acm = tty->driver_data;
 791         /*
 792          * Do not let the line discipline to know that we have a reserve,
 793          * or it might get too enthusiastic.
 794          */
 795         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 796 }
 797
 798 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 799 {
 800         struct acm *acm = tty->driver_data;
 801         /*
 802          * if the device was unplugged then any remaining characters fell out
 803          * of the connector ;)
 804          */
 805         if (acm->disconnected)
 806                 return 0;
 807         /*
 808          * This is inaccurate (overcounts), but it works.
 809          */
 810         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 811 }
 812
 813 static void acm_tty_throttle(struct tty_struct *tty)
 814 {
 815         struct acm *acm = tty->driver_data;
 816
 817         spin_lock_irq(&acm->read_lock);
 818         acm->throttle_req = 1;
 819         spin_unlock_irq(&acm->read_lock);
 820 }
 821
 822 static void acm_tty_unthrottle(struct tty_struct *tty)
 823 {
 824         struct acm *acm = tty->driver_data;
 825         unsigned int was_throttled;
 826
 827         spin_lock_irq(&acm->read_lock);
 828         was_throttled = acm->throttled;
 829         acm->throttled = 0;
 830         acm->throttle_req = 0;
 831         spin_unlock_irq(&acm->read_lock);
 832
 833         if (was_throttled)
 834                 acm_submit_read_urbs(acm, GFP_KERNEL);
 835 }
 836
 837 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 838 {
 839         struct acm *acm = tty->driver_data;
 840         int retval;
 841
 842         retval = acm_send_break(acm, state ? 0xffff : 0);
 843         if (retval < 0)
 844                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 845                                                                 __func__);
 846         return retval;
 847 }
 848
 849 static int acm_tty_tiocmget(struct tty_struct *tty)
 850 {
 851         struct acm *acm = tty->driver_data;
 852
 853         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 854                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 855                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 856                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 857                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 858                TIOCM_CTS;
 859 }
 860
 861 static int acm_tty_tiocmset(struct tty_struct *tty,
 862                             unsigned int set, unsigned int clear)
 863 {
 864         struct acm *acm = tty->driver_data;
 865         unsigned int newctrl;
 866
 867         newctrl = acm->ctrlout;
 868         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 869                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 870         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 871                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 872
 873         newctrl = (newctrl & ~clear) | set;
 874
 875         if (acm->ctrlout == newctrl)
 876                 return 0;
 877         return acm_set_control(acm, acm->ctrlout = newctrl);
 878 }
 879
 880 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 881 {
 882         struct serial_struct tmp;
 883
 884         if (!info)
 885                 return -EINVAL;
 886
 887         memset(&tmp, 0, sizeof(tmp));
 888         tmp.flags = ASYNC_LOW_LATENCY;
 889         tmp.xmit_fifo_size = acm->writesize;
 890         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 891         tmp.close_delay = acm->port.close_delay / 10;
 892         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 893                                 ASYNC_CLOSING_WAIT_NONE :
 894                                 acm->port.closing_wait / 10;
 895
 896         if (copy_to_user(info, &tmp, sizeof(tmp)))
 897                 return -EFAULT;
 898         else
 899                 return 0;
 900 }
 901
 902 static int set_serial_info(struct acm *acm,
 903                                 struct serial_struct __user *newinfo)
 904 {
 905         struct serial_struct new_serial;
 906         unsigned int closing_wait, close_delay;
 907         int retval = 0;
 908
 909         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 910                 return -EFAULT;
 911
 912         close_delay = new_serial.close_delay * 10;
 913         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 914                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 915
 916         mutex_lock(&acm->port.mutex);
 917
 918         if (!capable(CAP_SYS_ADMIN)) {
 919                 if ((close_delay != acm->port.close_delay) ||
 920                     (closing_wait != acm->port.closing_wait))
 921                         retval = -EPERM;
 922                 else
 923                         retval = -EOPNOTSUPP;
 924         } else {
 925                 acm->port.close_delay  = close_delay;
 926                 acm->port.closing_wait = closing_wait;
 927         }
 928
 929         mutex_unlock(&acm->port.mutex);
 930         return retval;
 931 }
 932
 933 static int wait_serial_change(struct acm *acm, unsigned long arg)
 934 {
 935         int rv = 0;
 936         DECLARE_WAITQUEUE(wait, current);
 937         struct async_icount old, new;
 938
 939         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD))
 940                 return -EINVAL;
 941         do {
 942                 spin_lock_irq(&acm->read_lock);
 943                 old = acm->oldcount;
 944                 new = acm->iocount;
 945                 acm->oldcount = new;
 946                 spin_unlock_irq(&acm->read_lock);
 947
 948                 if ((arg & TIOCM_DSR) &&
 949                         old.dsr != new.dsr)
 950                         break;
 951                 if ((arg & TIOCM_CD)  &&
 952                         old.dcd != new.dcd)
 953                         break;
 954                 if ((arg & TIOCM_RI) &&
 955                         old.rng != new.rng)
 956                         break;
 957
 958                 add_wait_queue(&acm->wioctl, &wait);
 959                 set_current_state(TASK_INTERRUPTIBLE);
 960                 schedule();
 961                 remove_wait_queue(&acm->wioctl, &wait);
 962                 if (acm->disconnected) {
 963                         if (arg & TIOCM_CD)
 964                                 break;
 965                         else
 966                                 rv = -ENODEV;
 967                 } else {
 968                         if (signal_pending(current))
 969                                 rv = -ERESTARTSYS;
 970                 }
 971         } while (!rv);
 972
 973
 974
 975         return rv;
 976 }
 977
 978 static int get_serial_usage(struct acm *acm,
 979                             struct serial_icounter_struct __user *count)
 980 {
 981         struct serial_icounter_struct icount;
 982         int rv = 0;
 983
 984         memset(&icount, 0, sizeof(icount));
 985         icount.dsr = acm->iocount.dsr;
 986         icount.rng = acm->iocount.rng;
 987         icount.dcd = acm->iocount.dcd;
 988         icount.frame = acm->iocount.frame;
 989         icount.overrun = acm->iocount.overrun;
 990         icount.parity = acm->iocount.parity;
 991         icount.brk = acm->iocount.brk;
 992
 993         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 994                 rv = -EFAULT;
 995
 996         return rv;
 997 }
 998
 999 static int acm_tty_ioctl(struct tty_struct *tty,
1000                                         unsigned int cmd, unsigned long arg)
1001 {
1002         struct acm *acm = tty->driver_data;
1003         int rv = -ENOIOCTLCMD;
1004
1005         switch (cmd) {
1006         case TIOCGSERIAL: /* gets serial port data */
1007                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
1008                 break;
1009         case TIOCSSERIAL:
1010                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
1011                 break;
1012         case TIOCMIWAIT:
1013                 rv = usb_autopm_get_interface(acm->control);
1014                 if (rv < 0) {
1015                         rv = -EIO;
1016                         break;
1017                 }
1018                 rv = wait_serial_change(acm, arg);
1019                 usb_autopm_put_interface(acm->control);
1020                 break;
1021         case TIOCGICOUNT:
1022                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
1023                 break;
1024         }
1025
1026         return rv;
1027 }
1028
1029 static void acm_tty_set_termios(struct tty_struct *tty,
1030                                                 struct ktermios *termios_old)
1031 {
1032         struct acm *acm = tty->driver_data;
1033         struct ktermios *termios = &tty->termios;
1034         struct usb_cdc_line_coding newline;
1035         int newctrl = acm->ctrlout;
1036
1037         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1038         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1039         newline.bParityType = termios->c_cflag & PARENB ?
1040                                 (termios->c_cflag & PARODD ? 1 : 2) +
1041                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1042         switch (termios->c_cflag & CSIZE) {
1043         case CS5:
1044                 newline.bDataBits = 5;
1045                 break;
1046         case CS6:
1047                 newline.bDataBits = 6;
1048                 break;
1049         case CS7:
1050                 newline.bDataBits = 7;
1051                 break;
1052         case CS8:
1053         default:
1054                 newline.bDataBits = 8;
1055                 break;
1056         }
1057         /* FIXME: Needs to clear unsupported bits in the termios */
1058         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1059
1060         if (C_BAUD(tty) == B0) {
1061                 newline.dwDTERate = acm->line.dwDTERate;
1062                 newctrl &= ~ACM_CTRL_DTR;
1063         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1064                 newctrl |=  ACM_CTRL_DTR;
1065         }
1066
1067         if (newctrl != acm->ctrlout)
1068                 acm_set_control(acm, acm->ctrlout = newctrl);
1069
1070         if (memcmp(&acm->line, &newline, sizeof newline)) {
1071                 memcpy(&acm->line, &newline, sizeof newline);
1072                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1073                         __func__,
1074                         le32_to_cpu(newline.dwDTERate),
1075                         newline.bCharFormat, newline.bParityType,
1076                         newline.bDataBits);
1077                 acm_set_line(acm, &acm->line);
1078         }
1079 }
1080
1081 static const struct tty_port_operations acm_port_ops = {
1082         .dtr_rts = acm_port_dtr_rts,
1083         .shutdown = acm_port_shutdown,
1084         .activate = acm_port_activate,
1085         .destruct = acm_port_destruct,
1086 };
1087
1088 /*
1089  * USB probe and disconnect routines.
1090  */
1091
1092 /* Little helpers: write/read buffers free */
1093 static void acm_write_buffers_free(struct acm *acm)
1094 {
1095         int i;
1096         struct acm_wb *wb;
1097         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1098
1099         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1100                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1101 }
1102
1103 static void acm_read_buffers_free(struct acm *acm)
1104 {
1105         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1106         int i;
1107
1108         for (i = 0; i < acm->rx_buflimit; i++)
1109                 usb_free_coherent(usb_dev, acm->readsize,
1110                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1111 }
1112
1113 /* Little helper: write buffers allocate */
1114 static int acm_write_buffers_alloc(struct acm *acm)
1115 {
1116         int i;
1117         struct acm_wb *wb;
1118
1119         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1120                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1121                     &wb->dmah);
1122                 if (!wb->buf) {
1123                         while (i != 0) {
1124                                 --i;
1125                                 --wb;
1126                                 usb_free_coherent(acm->dev, acm->writesize,
1127                                     wb->buf, wb->dmah);
1128                         }
1129                         return -ENOMEM;
1130                 }
1131         }
1132         return 0;
1133 }
1134
1135 static int acm_probe(struct usb_interface *intf,
1136                      const struct usb_device_id *id)
1137 {
1138         struct usb_cdc_union_desc *union_header = NULL;
1139         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1140         unsigned char *buffer = intf->altsetting->extra;
1141         int buflen = intf->altsetting->extralen;
1142         struct usb_interface *control_interface;
1143         struct usb_interface *data_interface;
1144         struct usb_endpoint_descriptor *epctrl = NULL;
1145         struct usb_endpoint_descriptor *epread = NULL;
1146         struct usb_endpoint_descriptor *epwrite = NULL;
1147         struct usb_device *usb_dev = interface_to_usbdev(intf);
1148         struct usb_cdc_parsed_header h;
1149         struct acm *acm;
1150         int minor;
1151         int ctrlsize, readsize;
1152         u8 *buf;
1153         int call_intf_num = -1;
1154         int data_intf_num = -1;
1155         unsigned long quirks;
1156         int num_rx_buf;
1157         int i;
1158         int combined_interfaces = 0;
1159         struct device *tty_dev;
1160         int rv = -ENOMEM;
1161
1162         /* normal quirks */
1163         quirks = (unsigned long)id->driver_info;
1164
1165         if (quirks == IGNORE_DEVICE)
1166                 return -ENODEV;
1167
1168         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1169
1170         /* handle quirks deadly to normal probing*/
1171         if (quirks == NO_UNION_NORMAL) {
1172                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1173                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1174                 /* we would crash */
1175                 if (!data_interface || !control_interface)
1176                         return -ENODEV;
1177                 goto skip_normal_probe;
1178         }
1179
1180         /* normal probing*/
1181         if (!buffer) {
1182                 dev_err(&intf->dev, "Weird descriptor references\n");
1183                 return -EINVAL;
1184         }
1185
1186         if (!buflen) {
1187                 if (intf->cur_altsetting->endpoint &&
1188                                 intf->cur_altsetting->endpoint->extralen &&
1189                                 intf->cur_altsetting->endpoint->extra) {
1190                         dev_dbg(&intf->dev,
1191                                 "Seeking extra descriptors on endpoint\n");
1192                         buflen = intf->cur_altsetting->endpoint->extralen;
1193                         buffer = intf->cur_altsetting->endpoint->extra;
1194                 } else {
1195                         dev_err(&intf->dev,
1196                                 "Zero length descriptor references\n");
1197                         return -EINVAL;
1198                 }
1199         }
1200
1201         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1202         union_header = h.usb_cdc_union_desc;
1203         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1204         if (cmgmd)
1205                 call_intf_num = cmgmd->bDataInterface;
1206
1207         if (!union_header) {
1208                 if (call_intf_num > 0) {
1209                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1210                         /* quirks for Droids MuIn LCD */
1211                         if (quirks & NO_DATA_INTERFACE) {
1212                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1213                         } else {
1214                                 data_intf_num = call_intf_num;
1215                                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1216                         }
1217                         control_interface = intf;
1218                 } else {
1219                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1220                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1221                                 return -ENODEV;
1222                         } else {
1223                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1224                                 combined_interfaces = 1;
1225                                 control_interface = data_interface = intf;
1226                                 goto look_for_collapsed_interface;
1227                         }
1228                 }
1229         } else {
1230                 data_intf_num = union_header->bSlaveInterface0;
1231                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1232                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1233         }
1234
1235         if (!control_interface || !data_interface) {
1236                 dev_dbg(&intf->dev, "no interfaces\n");
1237                 return -ENODEV;
1238         }
1239
1240         if (data_intf_num != call_intf_num)
1241                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1242
1243         if (control_interface == data_interface) {
1244                 /* some broken devices designed for windows work this way */
1245                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1246                 combined_interfaces = 1;
1247                 /* a popular other OS doesn't use it */
1248                 quirks |= NO_CAP_LINE;
1249                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1250                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1251                         return -EINVAL;
1252                 }
1253 look_for_collapsed_interface:
1254                 for (i = 0; i < 3; i++) {
1255                         struct usb_endpoint_descriptor *ep;
1256                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1257
1258                         if (usb_endpoint_is_int_in(ep))
1259                                 epctrl = ep;
1260                         else if (usb_endpoint_is_bulk_out(ep))
1261                                 epwrite = ep;
1262                         else if (usb_endpoint_is_bulk_in(ep))
1263                                 epread = ep;
1264                         else
1265                                 return -EINVAL;
1266                 }
1267                 if (!epctrl || !epread || !epwrite)
1268                         return -ENODEV;
1269                 else
1270                         goto made_compressed_probe;
1271         }
1272
1273 skip_normal_probe:
1274
1275         /*workaround for switched interfaces */
1276         if (data_interface->cur_altsetting->desc.bInterfaceClass
1277                                                 != CDC_DATA_INTERFACE_TYPE) {
1278                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1279                                                 == CDC_DATA_INTERFACE_TYPE) {
1280                         dev_dbg(&intf->dev,
1281                                 "Your device has switched interfaces.\n");
1282                         swap(control_interface, data_interface);
1283                 } else {
1284                         return -EINVAL;
1285                 }
1286         }
1287
1288         /* Accept probe requests only for the control interface */
1289         if (!combined_interfaces && intf != control_interface)
1290                 return -ENODEV;
1291
1292         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1293                 /* valid in this context */
1294                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1295                 return -EBUSY;
1296         }
1297
1298
1299         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1300             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1301                 return -EINVAL;
1302
1303         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1304         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1305         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1306
1307
1308         /* workaround for switched endpoints */
1309         if (!usb_endpoint_dir_in(epread)) {
1310                 /* descriptors are swapped */
1311                 dev_dbg(&intf->dev,
1312                         "The data interface has switched endpoints\n");
1313                 swap(epread, epwrite);
1314         }
1315 made_compressed_probe:
1316         dev_dbg(&intf->dev, "interfaces are valid\n");
1317
1318         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1319         if (acm == NULL)
1320                 goto alloc_fail;
1321
1322         minor = acm_alloc_minor(acm);
1323         if (minor < 0)
1324                 goto alloc_fail1;
1325
1326         ctrlsize = usb_endpoint_maxp(epctrl);
1327         readsize = usb_endpoint_maxp(epread) *
1328                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1329         acm->combined_interfaces = combined_interfaces;
1330         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1331         acm->control = control_interface;
1332         acm->data = data_interface;
1333         acm->minor = minor;
1334         acm->dev = usb_dev;
1335         if (h.usb_cdc_acm_descriptor)
1336                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1337         if (quirks & NO_CAP_LINE)
1338                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1339         acm->ctrlsize = ctrlsize;
1340         acm->readsize = readsize;
1341         acm->rx_buflimit = num_rx_buf;
1342         INIT_WORK(&acm->work, acm_softint);
1343         init_waitqueue_head(&acm->wioctl);
1344         spin_lock_init(&acm->write_lock);
1345         spin_lock_init(&acm->read_lock);
1346         mutex_init(&acm->mutex);
1347         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1348         if (acm->is_int_ep)
1349                 acm->bInterval = epread->bInterval;
1350         tty_port_init(&acm->port);
1351         acm->port.ops = &acm_port_ops;
1352         init_usb_anchor(&acm->delayed);
1353         acm->quirks = quirks;
1354
1355         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1356         if (!buf)
1357                 goto alloc_fail2;
1358         acm->ctrl_buffer = buf;
1359
1360         if (acm_write_buffers_alloc(acm) < 0)
1361                 goto alloc_fail4;
1362
1363         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1364         if (!acm->ctrlurb)
1365                 goto alloc_fail5;
1366
1367         for (i = 0; i < num_rx_buf; i++) {
1368                 struct acm_rb *rb = &(acm->read_buffers[i]);
1369                 struct urb *urb;
1370
1371                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1372                                                                 &rb->dma);
1373                 if (!rb->base)
1374                         goto alloc_fail6;
1375                 rb->index = i;
1376                 rb->instance = acm;
1377
1378                 urb = usb_alloc_urb(0, GFP_KERNEL);
1379                 if (!urb)
1380                         goto alloc_fail6;
1381
1382                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1383                 urb->transfer_dma = rb->dma;
1384                 if (acm->is_int_ep) {
1385                         usb_fill_int_urb(urb, acm->dev,
1386                                          usb_rcvintpipe(usb_dev, epread->bEndpointAddress),
1387                                          rb->base,
1388                                          acm->readsize,
1389                                          acm_read_bulk_callback, rb,
1390                                          acm->bInterval);
1391                 } else {
1392                         usb_fill_bulk_urb(urb, acm->dev,
1393                                           usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress),
1394                                           rb->base,
1395                                           acm->readsize,
1396                                           acm_read_bulk_callback, rb);
1397                 }
1398
1399                 acm->read_urbs[i] = urb;
1400                 __set_bit(i, &acm->read_urbs_free);
1401         }
1402         for (i = 0; i < ACM_NW; i++) {
1403                 struct acm_wb *snd = &(acm->wb[i]);
1404
1405                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1406                 if (snd->urb == NULL)
1407                         goto alloc_fail7;
1408
1409                 if (usb_endpoint_xfer_int(epwrite))
1410                         usb_fill_int_urb(snd->urb, usb_dev,
1411                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1412                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1413                 else
1414                         usb_fill_bulk_urb(snd->urb, usb_dev,
1415                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1416                                 NULL, acm->writesize, acm_write_bulk, snd);
1417                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1418                 if (quirks & SEND_ZERO_PACKET)
1419                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1420                 snd->instance = acm;
1421         }
1422
1423         usb_set_intfdata(intf, acm);
1424
1425         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1426         if (i < 0)
1427                 goto alloc_fail7;
1428
1429         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1430                 struct usb_cdc_country_functional_desc * cfd =
1431                                         h.usb_cdc_country_functional_desc;
1432
1433                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1434                 if (!acm->country_codes)
1435                         goto skip_countries;
1436                 acm->country_code_size = cfd->bLength - 4;
1437                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1438                                                         cfd->bLength - 4);
1439                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1440
1441                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1442                 if (i < 0) {
1443                         kfree(acm->country_codes);
1444                         acm->country_codes = NULL;
1445                         acm->country_code_size = 0;
1446                         goto skip_countries;
1447                 }
1448
1449                 i = device_create_file(&intf->dev,
1450                                                 &dev_attr_iCountryCodeRelDate);
1451                 if (i < 0) {
1452                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1453                         kfree(acm->country_codes);
1454                         acm->country_codes = NULL;
1455                         acm->country_code_size = 0;
1456                         goto skip_countries;
1457                 }
1458         }
1459
1460 skip_countries:
1461         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1462                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1463                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1464                          /* works around buggy devices */
1465                          epctrl->bInterval ? epctrl->bInterval : 16);
1466         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1467         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
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_fail8;
1484         }
1485
1486         if (quirks & CLEAR_HALT_CONDITIONS) {
1487                 usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress));
1488                 usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress));
1489         }
1490
1491         return 0;
1492 alloc_fail8:
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_fail7:
1502         usb_set_intfdata(intf, NULL);
1503         for (i = 0; i < ACM_NW; i++)
1504                 usb_free_urb(acm->wb[i].urb);
1505 alloc_fail6:
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_fail5:
1511         acm_write_buffers_free(acm);
1512 alloc_fail4:
1513         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1514 alloc_fail2:
1515         acm_release_minor(acm);
1516 alloc_fail1:
1517         kfree(acm);
1518 alloc_fail:
1519         return rv;
1520 }
1521
1522 static void stop_data_traffic(struct acm *acm)
1523 {
1524         int i;
1525
1526         usb_kill_urb(acm->ctrlurb);
1527         for (i = 0; i < ACM_NW; i++)
1528                 usb_kill_urb(acm->wb[i].urb);
1529         for (i = 0; i < acm->rx_buflimit; i++)
1530                 usb_kill_urb(acm->read_urbs[i]);
1531
1532         cancel_work_sync(&acm->work);
1533 }
1534
1535 static void acm_disconnect(struct usb_interface *intf)
1536 {
1537         struct acm *acm = usb_get_intfdata(intf);
1538         struct usb_device *usb_dev = interface_to_usbdev(intf);
1539         struct tty_struct *tty;
1540         int i;
1541
1542         /* sibling interface is already cleaning up */
1543         if (!acm)
1544                 return;
1545
1546         mutex_lock(&acm->mutex);
1547         acm->disconnected = true;
1548         if (acm->country_codes) {
1549                 device_remove_file(&acm->control->dev,
1550                                 &dev_attr_wCountryCodes);
1551                 device_remove_file(&acm->control->dev,
1552                                 &dev_attr_iCountryCodeRelDate);
1553         }
1554         wake_up_all(&acm->wioctl);
1555         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1556         usb_set_intfdata(acm->control, NULL);
1557         usb_set_intfdata(acm->data, NULL);
1558         mutex_unlock(&acm->mutex);
1559
1560         tty = tty_port_tty_get(&acm->port);
1561         if (tty) {
1562                 tty_vhangup(tty);
1563                 tty_kref_put(tty);
1564         }
1565
1566         stop_data_traffic(acm);
1567
1568         tty_unregister_device(acm_tty_driver, acm->minor);
1569
1570         usb_free_urb(acm->ctrlurb);
1571         for (i = 0; i < ACM_NW; i++)
1572                 usb_free_urb(acm->wb[i].urb);
1573         for (i = 0; i < acm->rx_buflimit; i++)
1574                 usb_free_urb(acm->read_urbs[i]);
1575         acm_write_buffers_free(acm);
1576         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1577         acm_read_buffers_free(acm);
1578
1579         if (!acm->combined_interfaces)
1580                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1581                                         acm->data : acm->control);
1582
1583         tty_port_put(&acm->port);
1584 }
1585
1586 #ifdef CONFIG_PM
1587 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1588 {
1589         struct acm *acm = usb_get_intfdata(intf);
1590         int cnt;
1591
1592         spin_lock_irq(&acm->write_lock);
1593         if (PMSG_IS_AUTO(message)) {
1594                 if (acm->transmitting) {
1595                         spin_unlock_irq(&acm->write_lock);
1596                         return -EBUSY;
1597                 }
1598         }
1599         cnt = acm->susp_count++;
1600         spin_unlock_irq(&acm->write_lock);
1601
1602         if (cnt)
1603                 return 0;
1604
1605         stop_data_traffic(acm);
1606
1607         return 0;
1608 }
1609
1610 static int acm_resume(struct usb_interface *intf)
1611 {
1612         struct acm *acm = usb_get_intfdata(intf);
1613         struct urb *urb;
1614         int rv = 0;
1615
1616         spin_lock_irq(&acm->write_lock);
1617
1618         if (--acm->susp_count)
1619                 goto out;
1620
1621         if (tty_port_initialized(&acm->port)) {
1622                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1623
1624                 for (;;) {
1625                         urb = usb_get_from_anchor(&acm->delayed);
1626                         if (!urb)
1627                                 break;
1628
1629                         acm_start_wb(acm, urb->context);
1630                 }
1631
1632                 /*
1633                  * delayed error checking because we must
1634                  * do the write path at all cost
1635                  */
1636                 if (rv < 0)
1637                         goto out;
1638
1639                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1640         }
1641 out:
1642         spin_unlock_irq(&acm->write_lock);
1643
1644         return rv;
1645 }
1646
1647 static int acm_reset_resume(struct usb_interface *intf)
1648 {
1649         struct acm *acm = usb_get_intfdata(intf);
1650
1651         if (tty_port_initialized(&acm->port))
1652                 tty_port_tty_hangup(&acm->port, false);
1653
1654         return acm_resume(intf);
1655 }
1656
1657 #endif /* CONFIG_PM */
1658
1659 #define NOKIA_PCSUITE_ACM_INFO(x) \
1660                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1661                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1662                 USB_CDC_ACM_PROTO_VENDOR)
1663
1664 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1665                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1666                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1667                 USB_CDC_ACM_PROTO_VENDOR)
1668
1669 /*
1670  * USB driver structure.
1671  */
1672
1673 static const struct usb_device_id acm_ids[] = {
1674         /* quirky and broken devices */
1675         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1676         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1677         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1678         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1679         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1680         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1681         },
1682         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1683         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1684         },
1685         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1686         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1687         },
1688         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1689         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1690         },
1691         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1692         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1693         },
1694         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1695         .driver_info = SINGLE_RX_URB,
1696         },
1697         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1698         .driver_info = SINGLE_RX_URB, /* firmware bug */
1699         },
1700         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1701         .driver_info = SINGLE_RX_URB, /* firmware bug */
1702         },
1703         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1704         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1705         },
1706         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1707         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1708         },
1709         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1710         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1711         },
1712         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1713         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1714         },
1715         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1716         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1717         },
1718         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1719         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1720         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1721         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1722         },
1723         /* Motorola H24 HSPA module: */
1724         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1725         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1726         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1727         },
1728         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1729         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1730         },
1731         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1732         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1733         },
1734         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1735         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1736         },
1737         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1738         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1739         },
1740         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1741         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1742         },
1743         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1744         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1745         },
1746
1747         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1748         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1749                                            data interface instead of
1750                                            communications interface.
1751                                            Maybe we should define a new
1752                                            quirk for this. */
1753         },
1754         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1755         .driver_info = NO_UNION_NORMAL,
1756         },
1757         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1758         .driver_info = NO_UNION_NORMAL,
1759         },
1760         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1761         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1762         },
1763         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1764         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1765         },
1766
1767         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1768         .driver_info = CLEAR_HALT_CONDITIONS,
1769         },
1770
1771         /* Nokia S60 phones expose two ACM channels. The first is
1772          * a modem and is picked up by the standard AT-command
1773          * information below. The second is 'vendor-specific' but
1774          * is treated as a serial device at the S60 end, so we want
1775          * to expose it on Linux too. */
1776         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1777         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1778         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1779         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1780         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1781         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1782         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1783         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1784         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1785         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1786         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1787         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1788         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1789         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1790         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1791         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1792         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1793         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1794         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1795         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1796         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1797         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1798         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1799         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1800         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1801         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1802         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1803         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1804         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1805         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1806         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1807         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1808         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1809         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1810         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1811         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1812         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1813         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1814         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1815         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1816         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1817         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1818         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1819         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1820         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1821         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1822         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1823         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1824         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1825         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1826         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1827         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1828         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1829         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1830         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1831         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1832         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1833         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1834
1835         /* Support for Owen devices */
1836         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1837
1838         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1839
1840         /* Support for Droids MuIn LCD */
1841         { USB_DEVICE(0x04d8, 0x000b),
1842         .driver_info = NO_DATA_INTERFACE,
1843         },
1844
1845 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1846         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1847         .driver_info = IGNORE_DEVICE,
1848         },
1849         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1850         .driver_info = IGNORE_DEVICE,
1851         },
1852 #endif
1853
1854         /*Samsung phone in firmware update mode */
1855         { USB_DEVICE(0x04e8, 0x685d),
1856         .driver_info = IGNORE_DEVICE,
1857         },
1858
1859         /* Exclude Infineon Flash Loader utility */
1860         { USB_DEVICE(0x058b, 0x0041),
1861         .driver_info = IGNORE_DEVICE,
1862         },
1863
1864         /* control interfaces without any protocol set */
1865         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1866                 USB_CDC_PROTO_NONE) },
1867
1868         /* control interfaces with various AT-command sets */
1869         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1870                 USB_CDC_ACM_PROTO_AT_V25TER) },
1871         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1872                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1873         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1874                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1875         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1876                 USB_CDC_ACM_PROTO_AT_GSM) },
1877         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1878                 USB_CDC_ACM_PROTO_AT_3G) },
1879         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1880                 USB_CDC_ACM_PROTO_AT_CDMA) },
1881
1882         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1883         .driver_info = SEND_ZERO_PACKET,
1884         },
1885
1886         { }
1887 };
1888
1889 MODULE_DEVICE_TABLE(usb, acm_ids);
1890
1891 static struct usb_driver acm_driver = {
1892         .name =         "cdc_acm",
1893         .probe =        acm_probe,
1894         .disconnect =   acm_disconnect,
1895 #ifdef CONFIG_PM
1896         .suspend =      acm_suspend,
1897         .resume =       acm_resume,
1898         .reset_resume = acm_reset_resume,
1899 #endif
1900         .id_table =     acm_ids,
1901 #ifdef CONFIG_PM
1902         .supports_autosuspend = 1,
1903 #endif
1904         .disable_hub_initiated_lpm = 1,
1905 };
1906
1907 /*
1908  * TTY driver structures.
1909  */
1910
1911 static const struct tty_operations acm_ops = {
1912         .install =              acm_tty_install,
1913         .open =                 acm_tty_open,
1914         .close =                acm_tty_close,
1915         .cleanup =              acm_tty_cleanup,
1916         .hangup =               acm_tty_hangup,
1917         .write =                acm_tty_write,
1918         .put_char =             acm_tty_put_char,
1919         .flush_chars =          acm_tty_flush_chars,
1920         .write_room =           acm_tty_write_room,
1921         .ioctl =                acm_tty_ioctl,
1922         .throttle =             acm_tty_throttle,
1923         .unthrottle =           acm_tty_unthrottle,
1924         .chars_in_buffer =      acm_tty_chars_in_buffer,
1925         .break_ctl =            acm_tty_break_ctl,
1926         .set_termios =          acm_tty_set_termios,
1927         .tiocmget =             acm_tty_tiocmget,
1928         .tiocmset =             acm_tty_tiocmset,
1929 };
1930
1931 /*
1932  * Init / exit.
1933  */
1934
1935 static int __init acm_init(void)
1936 {
1937         int retval;
1938         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1939         if (!acm_tty_driver)
1940                 return -ENOMEM;
1941         acm_tty_driver->driver_name = "acm",
1942         acm_tty_driver->name = "ttyACM",
1943         acm_tty_driver->major = ACM_TTY_MAJOR,
1944         acm_tty_driver->minor_start = 0,
1945         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1946         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1947         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1948         acm_tty_driver->init_termios = tty_std_termios;
1949         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1950                                                                 HUPCL | CLOCAL;
1951         tty_set_operations(acm_tty_driver, &acm_ops);
1952
1953         retval = tty_register_driver(acm_tty_driver);
1954         if (retval) {
1955                 put_tty_driver(acm_tty_driver);
1956                 return retval;
1957         }
1958
1959         retval = usb_register(&acm_driver);
1960         if (retval) {
1961                 tty_unregister_driver(acm_tty_driver);
1962                 put_tty_driver(acm_tty_driver);
1963                 return retval;
1964         }
1965
1966         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1967
1968         return 0;
1969 }
1970
1971 static void __exit acm_exit(void)
1972 {
1973         usb_deregister(&acm_driver);
1974         tty_unregister_driver(acm_tty_driver);
1975         put_tty_driver(acm_tty_driver);
1976         idr_destroy(&acm_minors);
1977 }
1978
1979 module_init(acm_init);
1980 module_exit(acm_exit);
1981
1982 MODULE_AUTHOR(DRIVER_AUTHOR);
1983 MODULE_DESCRIPTION(DRIVER_DESC);
1984 MODULE_LICENSE("GPL");
1985 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);