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/list.h>
  50
  51 #include "cdc-acm.h"
  52
  53
  54 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  55 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  56
  57 static struct usb_driver acm_driver;
  58 static struct tty_driver *acm_tty_driver;
  59 static struct acm *acm_table[ACM_TTY_MINORS];
  60
  61 static DEFINE_MUTEX(acm_table_lock);
  62
  63 /*
  64  * acm_table accessors
  65  */
  66
  67 /*
  68  * Look up an ACM structure by index. If found and not disconnected, increment
  69  * its refcount and return it with its mutex held.
  70  */
  71 static struct acm *acm_get_by_index(unsigned index)
  72 {
  73         struct acm *acm;
  74
  75         mutex_lock(&acm_table_lock);
  76         acm = acm_table[index];
  77         if (acm) {
  78                 mutex_lock(&acm->mutex);
  79                 if (acm->disconnected) {
  80                         mutex_unlock(&acm->mutex);
  81                         acm = NULL;
  82                 } else {
  83                         tty_port_get(&acm->port);
  84                         mutex_unlock(&acm->mutex);
  85                 }
  86         }
  87         mutex_unlock(&acm_table_lock);
  88         return acm;
  89 }
  90
  91 /*
  92  * Try to find an available minor number and if found, associate it with 'acm'.
  93  */
  94 static int acm_alloc_minor(struct acm *acm)
  95 {
  96         int minor;
  97
  98         mutex_lock(&acm_table_lock);
  99         for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
 100                 if (!acm_table[minor]) {
 101                         acm_table[minor] = acm;
 102                         break;
 103                 }
 104         }
 105         mutex_unlock(&acm_table_lock);
 106
 107         return minor;
 108 }
 109
 110 /* Release the minor number associated with 'acm'.  */
 111 static void acm_release_minor(struct acm *acm)
 112 {
 113         mutex_lock(&acm_table_lock);
 114         acm_table[acm->minor] = NULL;
 115         mutex_unlock(&acm_table_lock);
 116 }
 117
 118 /*
 119  * Functions for ACM control messages.
 120  */
 121
 122 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 123                                                         void *buf, int len)
 124 {
 125         int retval;
 126
 127         retval = usb_autopm_get_interface(acm->control);
 128         if (retval)
 129                 return retval;
 130
 131         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 132                 request, USB_RT_ACM, value,
 133                 acm->control->altsetting[0].desc.bInterfaceNumber,
 134                 buf, len, 5000);
 135
 136         dev_dbg(&acm->control->dev,
 137                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 138                         __func__, request, value, len, retval);
 139
 140         usb_autopm_put_interface(acm->control);
 141
 142         return retval < 0 ? retval : 0;
 143 }
 144
 145 /* devices aren't required to support these requests.
 146  * the cdc acm descriptor tells whether they do...
 147  */
 148 #define acm_set_control(acm, control) \
 149         acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
 150 #define acm_set_line(acm, line) \
 151         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 152 #define acm_send_break(acm, ms) \
 153         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 154
 155 /*
 156  * Write buffer management.
 157  * All of these assume proper locks taken by the caller.
 158  */
 159
 160 static int acm_wb_alloc(struct acm *acm)
 161 {
 162         int i, wbn;
 163         struct acm_wb *wb;
 164
 165         wbn = 0;
 166         i = 0;
 167         for (;;) {
 168                 wb = &acm->wb[wbn];
 169                 if (!wb->use) {
 170                         wb->use = 1;
 171                         return wbn;
 172                 }
 173                 wbn = (wbn + 1) % ACM_NW;
 174                 if (++i >= ACM_NW)
 175                         return -1;
 176         }
 177 }
 178
 179 static int acm_wb_is_avail(struct acm *acm)
 180 {
 181         int i, n;
 182         unsigned long flags;
 183
 184         n = ACM_NW;
 185         spin_lock_irqsave(&acm->write_lock, flags);
 186         for (i = 0; i < ACM_NW; i++)
 187                 n -= acm->wb[i].use;
 188         spin_unlock_irqrestore(&acm->write_lock, flags);
 189         return n;
 190 }
 191
 192 /*
 193  * Finish write. Caller must hold acm->write_lock
 194  */
 195 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 196 {
 197         wb->use = 0;
 198         acm->transmitting--;
 199         usb_autopm_put_interface_async(acm->control);
 200 }
 201
 202 /*
 203  * Poke write.
 204  *
 205  * the caller is responsible for locking
 206  */
 207
 208 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 209 {
 210         int rc;
 211
 212         acm->transmitting++;
 213
 214         wb->urb->transfer_buffer = wb->buf;
 215         wb->urb->transfer_dma = wb->dmah;
 216         wb->urb->transfer_buffer_length = wb->len;
 217         wb->urb->dev = acm->dev;
 218
 219         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 220         if (rc < 0) {
 221                 dev_err(&acm->data->dev,
 222                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 223                         __func__, rc);
 224                 acm_write_done(acm, wb);
 225         }
 226         return rc;
 227 }
 228
 229 /*
 230  * attributes exported through sysfs
 231  */
 232 static ssize_t show_caps
 233 (struct device *dev, struct device_attribute *attr, char *buf)
 234 {
 235         struct usb_interface *intf = to_usb_interface(dev);
 236         struct acm *acm = usb_get_intfdata(intf);
 237
 238         return sprintf(buf, "%d", acm->ctrl_caps);
 239 }
 240 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 241
 242 static ssize_t show_country_codes
 243 (struct device *dev, struct device_attribute *attr, char *buf)
 244 {
 245         struct usb_interface *intf = to_usb_interface(dev);
 246         struct acm *acm = usb_get_intfdata(intf);
 247
 248         memcpy(buf, acm->country_codes, acm->country_code_size);
 249         return acm->country_code_size;
 250 }
 251
 252 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 253
 254 static ssize_t show_country_rel_date
 255 (struct device *dev, struct device_attribute *attr, char *buf)
 256 {
 257         struct usb_interface *intf = to_usb_interface(dev);
 258         struct acm *acm = usb_get_intfdata(intf);
 259
 260         return sprintf(buf, "%d", acm->country_rel_date);
 261 }
 262
 263 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 264 /*
 265  * Interrupt handlers for various ACM device responses
 266  */
 267
 268 /* control interface reports status changes with "interrupt" transfers */
 269 static void acm_ctrl_irq(struct urb *urb)
 270 {
 271         struct acm *acm = urb->context;
 272         struct usb_cdc_notification *dr = urb->transfer_buffer;
 273         unsigned char *data;
 274         int newctrl;
 275         int difference;
 276         int retval;
 277         int status = urb->status;
 278
 279         switch (status) {
 280         case 0:
 281                 /* success */
 282                 break;
 283         case -ECONNRESET:
 284         case -ENOENT:
 285         case -ESHUTDOWN:
 286                 /* this urb is terminated, clean up */
 287                 dev_dbg(&acm->control->dev,
 288                                 "%s - urb shutting down with status: %d\n",
 289                                 __func__, status);
 290                 return;
 291         default:
 292                 dev_dbg(&acm->control->dev,
 293                                 "%s - nonzero urb status received: %d\n",
 294                                 __func__, status);
 295                 goto exit;
 296         }
 297
 298         usb_mark_last_busy(acm->dev);
 299
 300         data = (unsigned char *)(dr + 1);
 301         switch (dr->bNotificationType) {
 302         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 303                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
 304                                                         __func__, dr->wValue);
 305                 break;
 306
 307         case USB_CDC_NOTIFY_SERIAL_STATE:
 308                 newctrl = get_unaligned_le16(data);
 309
 310                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 311                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
 312                                         __func__);
 313                         tty_port_tty_hangup(&acm->port, false);
 314                 }
 315
 316                 difference = acm->ctrlin ^ newctrl;
 317                 spin_lock(&acm->read_lock);
 318                 acm->ctrlin = newctrl;
 319                 acm->oldcount = acm->iocount;
 320
 321                 if (difference & ACM_CTRL_DSR)
 322                         acm->iocount.dsr++;
 323                 if (difference & ACM_CTRL_BRK)
 324                         acm->iocount.brk++;
 325                 if (difference & ACM_CTRL_RI)
 326                         acm->iocount.rng++;
 327                 if (difference & ACM_CTRL_DCD)
 328                         acm->iocount.dcd++;
 329                 if (difference & ACM_CTRL_FRAMING)
 330                         acm->iocount.frame++;
 331                 if (difference & ACM_CTRL_PARITY)
 332                         acm->iocount.parity++;
 333                 if (difference & ACM_CTRL_OVERRUN)
 334                         acm->iocount.overrun++;
 335                 spin_unlock(&acm->read_lock);
 336
 337                 if (difference)
 338                         wake_up_all(&acm->wioctl);
 339
 340                 break;
 341
 342         default:
 343                 dev_dbg(&acm->control->dev,
 344                         "%s - unknown notification %d received: index %d "
 345                         "len %d data0 %d data1 %d\n",
 346                         __func__,
 347                         dr->bNotificationType, dr->wIndex,
 348                         dr->wLength, data[0], data[1]);
 349                 break;
 350         }
 351 exit:
 352         retval = usb_submit_urb(urb, GFP_ATOMIC);
 353         if (retval)
 354                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 355                                                         __func__, retval);
 356 }
 357
 358 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 359 {
 360         int res;
 361
 362         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 363                 return 0;
 364
 365         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
 366
 367         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 368         if (res) {
 369                 if (res != -EPERM) {
 370                         dev_err(&acm->data->dev,
 371                                         "%s - usb_submit_urb failed: %d\n",
 372                                         __func__, res);
 373                 }
 374                 set_bit(index, &acm->read_urbs_free);
 375                 return res;
 376         }
 377
 378         return 0;
 379 }
 380
 381 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 382 {
 383         int res;
 384         int i;
 385
 386         for (i = 0; i < acm->rx_buflimit; ++i) {
 387                 res = acm_submit_read_urb(acm, i, mem_flags);
 388                 if (res)
 389                         return res;
 390         }
 391
 392         return 0;
 393 }
 394
 395 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 396 {
 397         if (!urb->actual_length)
 398                 return;
 399
 400         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 401                         urb->actual_length);
 402         tty_flip_buffer_push(&acm->port);
 403 }
 404
 405 static void acm_read_bulk_callback(struct urb *urb)
 406 {
 407         struct acm_rb *rb = urb->context;
 408         struct acm *acm = rb->instance;
 409         unsigned long flags;
 410
 411         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
 412                                         rb->index, urb->actual_length);
 413         set_bit(rb->index, &acm->read_urbs_free);
 414
 415         if (!acm->dev) {
 416                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 417                 return;
 418         }
 419         usb_mark_last_busy(acm->dev);
 420
 421         if (urb->status) {
 422                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
 423                                                         __func__, urb->status);
 424                 return;
 425         }
 426         acm_process_read_urb(acm, urb);
 427
 428         /* throttle device if requested by tty */
 429         spin_lock_irqsave(&acm->read_lock, flags);
 430         acm->throttled = acm->throttle_req;
 431         if (!acm->throttled) {
 432                 spin_unlock_irqrestore(&acm->read_lock, flags);
 433                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 434         } else {
 435                 spin_unlock_irqrestore(&acm->read_lock, flags);
 436         }
 437 }
 438
 439 /* data interface wrote those outgoing bytes */
 440 static void acm_write_bulk(struct urb *urb)
 441 {
 442         struct acm_wb *wb = urb->context;
 443         struct acm *acm = wb->instance;
 444         unsigned long flags;
 445
 446         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
 447                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
 448                         __func__,
 449                         urb->actual_length,
 450                         urb->transfer_buffer_length,
 451                         urb->status);
 452
 453         spin_lock_irqsave(&acm->write_lock, flags);
 454         acm_write_done(acm, wb);
 455         spin_unlock_irqrestore(&acm->write_lock, flags);
 456         schedule_work(&acm->work);
 457 }
 458
 459 static void acm_softint(struct work_struct *work)
 460 {
 461         struct acm *acm = container_of(work, struct acm, work);
 462
 463         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 464
 465         tty_port_tty_wakeup(&acm->port);
 466 }
 467
 468 /*
 469  * TTY handlers
 470  */
 471
 472 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 473 {
 474         struct acm *acm;
 475         int retval;
 476
 477         dev_dbg(tty->dev, "%s\n", __func__);
 478
 479         acm = acm_get_by_index(tty->index);
 480         if (!acm)
 481                 return -ENODEV;
 482
 483         retval = tty_standard_install(driver, tty);
 484         if (retval)
 485                 goto error_init_termios;
 486
 487         tty->driver_data = acm;
 488
 489         return 0;
 490
 491 error_init_termios:
 492         tty_port_put(&acm->port);
 493         return retval;
 494 }
 495
 496 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 497 {
 498         struct acm *acm = tty->driver_data;
 499
 500         dev_dbg(tty->dev, "%s\n", __func__);
 501
 502         return tty_port_open(&acm->port, tty, filp);
 503 }
 504
 505 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 506 {
 507         struct acm *acm = container_of(port, struct acm, port);
 508         int retval = -ENODEV;
 509         int i;
 510
 511         dev_dbg(&acm->control->dev, "%s\n", __func__);
 512
 513         mutex_lock(&acm->mutex);
 514         if (acm->disconnected)
 515                 goto disconnected;
 516
 517         retval = usb_autopm_get_interface(acm->control);
 518         if (retval)
 519                 goto error_get_interface;
 520
 521         /*
 522          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 523          * memory is really nasty...
 524          */
 525         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 526         acm->control->needs_remote_wakeup = 1;
 527
 528         acm->ctrlurb->dev = acm->dev;
 529         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 530         if (retval) {
 531                 dev_err(&acm->control->dev,
 532                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 533                 goto error_submit_urb;
 534         }
 535
 536         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
 537         retval = acm_set_control(acm, acm->ctrlout);
 538         if (retval < 0 && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 539                 goto error_set_control;
 540
 541         /*
 542          * Unthrottle device in case the TTY was closed while throttled.
 543          */
 544         spin_lock_irq(&acm->read_lock);
 545         acm->throttled = 0;
 546         acm->throttle_req = 0;
 547         spin_unlock_irq(&acm->read_lock);
 548
 549         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 550         if (retval)
 551                 goto error_submit_read_urbs;
 552
 553         usb_autopm_put_interface(acm->control);
 554
 555         mutex_unlock(&acm->mutex);
 556
 557         return 0;
 558
 559 error_submit_read_urbs:
 560         for (i = 0; i < acm->rx_buflimit; i++)
 561                 usb_kill_urb(acm->read_urbs[i]);
 562         acm->ctrlout = 0;
 563         acm_set_control(acm, acm->ctrlout);
 564 error_set_control:
 565         usb_kill_urb(acm->ctrlurb);
 566 error_submit_urb:
 567         usb_autopm_put_interface(acm->control);
 568 error_get_interface:
 569 disconnected:
 570         mutex_unlock(&acm->mutex);
 571
 572         return usb_translate_errors(retval);
 573 }
 574
 575 static void acm_port_destruct(struct tty_port *port)
 576 {
 577         struct acm *acm = container_of(port, struct acm, port);
 578
 579         dev_dbg(&acm->control->dev, "%s\n", __func__);
 580
 581         acm_release_minor(acm);
 582         usb_put_intf(acm->control);
 583         kfree(acm->country_codes);
 584         kfree(acm);
 585 }
 586
 587 static void acm_port_shutdown(struct tty_port *port)
 588 {
 589         struct acm *acm = container_of(port, struct acm, port);
 590         struct urb *urb;
 591         struct acm_wb *wb;
 592         int i;
 593         int pm_err;
 594
 595         dev_dbg(&acm->control->dev, "%s\n", __func__);
 596
 597         mutex_lock(&acm->mutex);
 598         if (!acm->disconnected) {
 599                 pm_err = usb_autopm_get_interface(acm->control);
 600                 acm_set_control(acm, acm->ctrlout = 0);
 601
 602                 for (;;) {
 603                         urb = usb_get_from_anchor(&acm->delayed);
 604                         if (!urb)
 605                                 break;
 606                         wb = urb->context;
 607                         wb->use = 0;
 608                         usb_autopm_put_interface_async(acm->control);
 609                 }
 610
 611                 usb_kill_urb(acm->ctrlurb);
 612                 for (i = 0; i < ACM_NW; i++)
 613                         usb_kill_urb(acm->wb[i].urb);
 614                 for (i = 0; i < acm->rx_buflimit; i++)
 615                         usb_kill_urb(acm->read_urbs[i]);
 616                 acm->control->needs_remote_wakeup = 0;
 617                 if (!pm_err)
 618                         usb_autopm_put_interface(acm->control);
 619         }
 620         mutex_unlock(&acm->mutex);
 621 }
 622
 623 static void acm_tty_cleanup(struct tty_struct *tty)
 624 {
 625         struct acm *acm = tty->driver_data;
 626         dev_dbg(&acm->control->dev, "%s\n", __func__);
 627         tty_port_put(&acm->port);
 628 }
 629
 630 static void acm_tty_hangup(struct tty_struct *tty)
 631 {
 632         struct acm *acm = tty->driver_data;
 633         dev_dbg(&acm->control->dev, "%s\n", __func__);
 634         tty_port_hangup(&acm->port);
 635 }
 636
 637 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 638 {
 639         struct acm *acm = tty->driver_data;
 640         dev_dbg(&acm->control->dev, "%s\n", __func__);
 641         tty_port_close(&acm->port, tty, filp);
 642 }
 643
 644 static int acm_tty_write(struct tty_struct *tty,
 645                                         const unsigned char *buf, int count)
 646 {
 647         struct acm *acm = tty->driver_data;
 648         int stat;
 649         unsigned long flags;
 650         int wbn;
 651         struct acm_wb *wb;
 652
 653         if (!count)
 654                 return 0;
 655
 656         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 657
 658         spin_lock_irqsave(&acm->write_lock, flags);
 659         wbn = acm_wb_alloc(acm);
 660         if (wbn < 0) {
 661                 spin_unlock_irqrestore(&acm->write_lock, flags);
 662                 return 0;
 663         }
 664         wb = &acm->wb[wbn];
 665
 666         if (!acm->dev) {
 667                 wb->use = 0;
 668                 spin_unlock_irqrestore(&acm->write_lock, flags);
 669                 return -ENODEV;
 670         }
 671
 672         count = (count > acm->writesize) ? acm->writesize : count;
 673         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 674         memcpy(wb->buf, buf, count);
 675         wb->len = count;
 676
 677         stat = usb_autopm_get_interface_async(acm->control);
 678         if (stat) {
 679                 wb->use = 0;
 680                 spin_unlock_irqrestore(&acm->write_lock, flags);
 681                 return stat;
 682         }
 683
 684         if (acm->susp_count) {
 685                 usb_anchor_urb(wb->urb, &acm->delayed);
 686                 spin_unlock_irqrestore(&acm->write_lock, flags);
 687                 return count;
 688         }
 689         usb_mark_last_busy(acm->dev);
 690
 691         stat = acm_start_wb(acm, wb);
 692         spin_unlock_irqrestore(&acm->write_lock, flags);
 693
 694         if (stat < 0)
 695                 return stat;
 696         return count;
 697 }
 698
 699 static int acm_tty_write_room(struct tty_struct *tty)
 700 {
 701         struct acm *acm = tty->driver_data;
 702         /*
 703          * Do not let the line discipline to know that we have a reserve,
 704          * or it might get too enthusiastic.
 705          */
 706         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 707 }
 708
 709 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 710 {
 711         struct acm *acm = tty->driver_data;
 712         /*
 713          * if the device was unplugged then any remaining characters fell out
 714          * of the connector ;)
 715          */
 716         if (acm->disconnected)
 717                 return 0;
 718         /*
 719          * This is inaccurate (overcounts), but it works.
 720          */
 721         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 722 }
 723
 724 static void acm_tty_throttle(struct tty_struct *tty)
 725 {
 726         struct acm *acm = tty->driver_data;
 727
 728         spin_lock_irq(&acm->read_lock);
 729         acm->throttle_req = 1;
 730         spin_unlock_irq(&acm->read_lock);
 731 }
 732
 733 static void acm_tty_unthrottle(struct tty_struct *tty)
 734 {
 735         struct acm *acm = tty->driver_data;
 736         unsigned int was_throttled;
 737
 738         spin_lock_irq(&acm->read_lock);
 739         was_throttled = acm->throttled;
 740         acm->throttled = 0;
 741         acm->throttle_req = 0;
 742         spin_unlock_irq(&acm->read_lock);
 743
 744         if (was_throttled)
 745                 acm_submit_read_urbs(acm, GFP_KERNEL);
 746 }
 747
 748 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 749 {
 750         struct acm *acm = tty->driver_data;
 751         int retval;
 752
 753         retval = acm_send_break(acm, state ? 0xffff : 0);
 754         if (retval < 0)
 755                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 756                                                                 __func__);
 757         return retval;
 758 }
 759
 760 static int acm_tty_tiocmget(struct tty_struct *tty)
 761 {
 762         struct acm *acm = tty->driver_data;
 763
 764         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 765                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 766                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 767                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 768                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 769                TIOCM_CTS;
 770 }
 771
 772 static int acm_tty_tiocmset(struct tty_struct *tty,
 773                             unsigned int set, unsigned int clear)
 774 {
 775         struct acm *acm = tty->driver_data;
 776         unsigned int newctrl;
 777
 778         newctrl = acm->ctrlout;
 779         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 780                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 781         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 782                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 783
 784         newctrl = (newctrl & ~clear) | set;
 785
 786         if (acm->ctrlout == newctrl)
 787                 return 0;
 788         return acm_set_control(acm, acm->ctrlout = newctrl);
 789 }
 790
 791 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 792 {
 793         struct serial_struct tmp;
 794
 795         if (!info)
 796                 return -EINVAL;
 797
 798         memset(&tmp, 0, sizeof(tmp));
 799         tmp.flags = ASYNC_LOW_LATENCY;
 800         tmp.xmit_fifo_size = acm->writesize;
 801         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 802         tmp.close_delay = acm->port.close_delay / 10;
 803         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 804                                 ASYNC_CLOSING_WAIT_NONE :
 805                                 acm->port.closing_wait / 10;
 806
 807         if (copy_to_user(info, &tmp, sizeof(tmp)))
 808                 return -EFAULT;
 809         else
 810                 return 0;
 811 }
 812
 813 static int set_serial_info(struct acm *acm,
 814                                 struct serial_struct __user *newinfo)
 815 {
 816         struct serial_struct new_serial;
 817         unsigned int closing_wait, close_delay;
 818         int retval = 0;
 819
 820         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 821                 return -EFAULT;
 822
 823         close_delay = new_serial.close_delay * 10;
 824         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 825                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 826
 827         mutex_lock(&acm->port.mutex);
 828
 829         if (!capable(CAP_SYS_ADMIN)) {
 830                 if ((close_delay != acm->port.close_delay) ||
 831                     (closing_wait != acm->port.closing_wait))
 832                         retval = -EPERM;
 833                 else
 834                         retval = -EOPNOTSUPP;
 835         } else {
 836                 acm->port.close_delay  = close_delay;
 837                 acm->port.closing_wait = closing_wait;
 838         }
 839
 840         mutex_unlock(&acm->port.mutex);
 841         return retval;
 842 }
 843
 844 static int wait_serial_change(struct acm *acm, unsigned long arg)
 845 {
 846         int rv = 0;
 847         DECLARE_WAITQUEUE(wait, current);
 848         struct async_icount old, new;
 849
 850         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
 851                 return -EINVAL;
 852         do {
 853                 spin_lock_irq(&acm->read_lock);
 854                 old = acm->oldcount;
 855                 new = acm->iocount;
 856                 acm->oldcount = new;
 857                 spin_unlock_irq(&acm->read_lock);
 858
 859                 if ((arg & TIOCM_DSR) &&
 860                         old.dsr != new.dsr)
 861                         break;
 862                 if ((arg & TIOCM_CD)  &&
 863                         old.dcd != new.dcd)
 864                         break;
 865                 if ((arg & TIOCM_RI) &&
 866                         old.rng != new.rng)
 867                         break;
 868
 869                 add_wait_queue(&acm->wioctl, &wait);
 870                 set_current_state(TASK_INTERRUPTIBLE);
 871                 schedule();
 872                 remove_wait_queue(&acm->wioctl, &wait);
 873                 if (acm->disconnected) {
 874                         if (arg & TIOCM_CD)
 875                                 break;
 876                         else
 877                                 rv = -ENODEV;
 878                 } else {
 879                         if (signal_pending(current))
 880                                 rv = -ERESTARTSYS;
 881                 }
 882         } while (!rv);
 883
 884
 885
 886         return rv;
 887 }
 888
 889 static int get_serial_usage(struct acm *acm,
 890                             struct serial_icounter_struct __user *count)
 891 {
 892         struct serial_icounter_struct icount;
 893         int rv = 0;
 894
 895         memset(&icount, 0, sizeof(icount));
 896         icount.dsr = acm->iocount.dsr;
 897         icount.rng = acm->iocount.rng;
 898         icount.dcd = acm->iocount.dcd;
 899         icount.frame = acm->iocount.frame;
 900         icount.overrun = acm->iocount.overrun;
 901         icount.parity = acm->iocount.parity;
 902         icount.brk = acm->iocount.brk;
 903
 904         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 905                 rv = -EFAULT;
 906
 907         return rv;
 908 }
 909
 910 static int acm_tty_ioctl(struct tty_struct *tty,
 911                                         unsigned int cmd, unsigned long arg)
 912 {
 913         struct acm *acm = tty->driver_data;
 914         int rv = -ENOIOCTLCMD;
 915
 916         switch (cmd) {
 917         case TIOCGSERIAL: /* gets serial port data */
 918                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 919                 break;
 920         case TIOCSSERIAL:
 921                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 922                 break;
 923         case TIOCMIWAIT:
 924                 rv = usb_autopm_get_interface(acm->control);
 925                 if (rv < 0) {
 926                         rv = -EIO;
 927                         break;
 928                 }
 929                 rv = wait_serial_change(acm, arg);
 930                 usb_autopm_put_interface(acm->control);
 931                 break;
 932         case TIOCGICOUNT:
 933                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
 934                 break;
 935         }
 936
 937         return rv;
 938 }
 939
 940 static void acm_tty_set_termios(struct tty_struct *tty,
 941                                                 struct ktermios *termios_old)
 942 {
 943         struct acm *acm = tty->driver_data;
 944         struct ktermios *termios = &tty->termios;
 945         struct usb_cdc_line_coding newline;
 946         int newctrl = acm->ctrlout;
 947
 948         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 949         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 950         newline.bParityType = termios->c_cflag & PARENB ?
 951                                 (termios->c_cflag & PARODD ? 1 : 2) +
 952                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 953         switch (termios->c_cflag & CSIZE) {
 954         case CS5:
 955                 newline.bDataBits = 5;
 956                 break;
 957         case CS6:
 958                 newline.bDataBits = 6;
 959                 break;
 960         case CS7:
 961                 newline.bDataBits = 7;
 962                 break;
 963         case CS8:
 964         default:
 965                 newline.bDataBits = 8;
 966                 break;
 967         }
 968         /* FIXME: Needs to clear unsupported bits in the termios */
 969         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 970
 971         if (!newline.dwDTERate) {
 972                 newline.dwDTERate = acm->line.dwDTERate;
 973                 newctrl &= ~ACM_CTRL_DTR;
 974         } else
 975                 newctrl |=  ACM_CTRL_DTR;
 976
 977         if (newctrl != acm->ctrlout)
 978                 acm_set_control(acm, acm->ctrlout = newctrl);
 979
 980         if (memcmp(&acm->line, &newline, sizeof newline)) {
 981                 memcpy(&acm->line, &newline, sizeof newline);
 982                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 983                         __func__,
 984                         le32_to_cpu(newline.dwDTERate),
 985                         newline.bCharFormat, newline.bParityType,
 986                         newline.bDataBits);
 987                 acm_set_line(acm, &acm->line);
 988         }
 989 }
 990
 991 static const struct tty_port_operations acm_port_ops = {
 992         .shutdown = acm_port_shutdown,
 993         .activate = acm_port_activate,
 994         .destruct = acm_port_destruct,
 995 };
 996
 997 /*
 998  * USB probe and disconnect routines.
 999  */
1000
1001 /* Little helpers: write/read buffers free */
1002 static void acm_write_buffers_free(struct acm *acm)
1003 {
1004         int i;
1005         struct acm_wb *wb;
1006         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1007
1008         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1009                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1010 }
1011
1012 static void acm_read_buffers_free(struct acm *acm)
1013 {
1014         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1015         int i;
1016
1017         for (i = 0; i < acm->rx_buflimit; i++)
1018                 usb_free_coherent(usb_dev, acm->readsize,
1019                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1020 }
1021
1022 /* Little helper: write buffers allocate */
1023 static int acm_write_buffers_alloc(struct acm *acm)
1024 {
1025         int i;
1026         struct acm_wb *wb;
1027
1028         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1029                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1030                     &wb->dmah);
1031                 if (!wb->buf) {
1032                         while (i != 0) {
1033                                 --i;
1034                                 --wb;
1035                                 usb_free_coherent(acm->dev, acm->writesize,
1036                                     wb->buf, wb->dmah);
1037                         }
1038                         return -ENOMEM;
1039                 }
1040         }
1041         return 0;
1042 }
1043
1044 static int acm_probe(struct usb_interface *intf,
1045                      const struct usb_device_id *id)
1046 {
1047         struct usb_cdc_union_desc *union_header = NULL;
1048         struct usb_cdc_country_functional_desc *cfd = NULL;
1049         unsigned char *buffer = intf->altsetting->extra;
1050         int buflen = intf->altsetting->extralen;
1051         struct usb_interface *control_interface;
1052         struct usb_interface *data_interface;
1053         struct usb_endpoint_descriptor *epctrl = NULL;
1054         struct usb_endpoint_descriptor *epread = NULL;
1055         struct usb_endpoint_descriptor *epwrite = NULL;
1056         struct usb_device *usb_dev = interface_to_usbdev(intf);
1057         struct acm *acm;
1058         int minor;
1059         int ctrlsize, readsize;
1060         u8 *buf;
1061         u8 ac_management_function = 0;
1062         u8 call_management_function = 0;
1063         int call_interface_num = -1;
1064         int data_interface_num = -1;
1065         unsigned long quirks;
1066         int num_rx_buf;
1067         int i;
1068         int combined_interfaces = 0;
1069         struct device *tty_dev;
1070         int rv = -ENOMEM;
1071
1072         /* normal quirks */
1073         quirks = (unsigned long)id->driver_info;
1074
1075         if (quirks == IGNORE_DEVICE)
1076                 return -ENODEV;
1077
1078         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1079
1080         /* handle quirks deadly to normal probing*/
1081         if (quirks == NO_UNION_NORMAL) {
1082                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1083                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1084                 goto skip_normal_probe;
1085         }
1086
1087         /* normal probing*/
1088         if (!buffer) {
1089                 dev_err(&intf->dev, "Weird descriptor references\n");
1090                 return -EINVAL;
1091         }
1092
1093         if (!buflen) {
1094                 if (intf->cur_altsetting->endpoint &&
1095                                 intf->cur_altsetting->endpoint->extralen &&
1096                                 intf->cur_altsetting->endpoint->extra) {
1097                         dev_dbg(&intf->dev,
1098                                 "Seeking extra descriptors on endpoint\n");
1099                         buflen = intf->cur_altsetting->endpoint->extralen;
1100                         buffer = intf->cur_altsetting->endpoint->extra;
1101                 } else {
1102                         dev_err(&intf->dev,
1103                                 "Zero length descriptor references\n");
1104                         return -EINVAL;
1105                 }
1106         }
1107
1108         while (buflen > 0) {
1109                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1110                         dev_err(&intf->dev, "skipping garbage\n");
1111                         goto next_desc;
1112                 }
1113
1114                 switch (buffer[2]) {
1115                 case USB_CDC_UNION_TYPE: /* we've found it */
1116                         if (union_header) {
1117                                 dev_err(&intf->dev, "More than one "
1118                                         "union descriptor, skipping ...\n");
1119                                 goto next_desc;
1120                         }
1121                         union_header = (struct usb_cdc_union_desc *)buffer;
1122                         break;
1123                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1124                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1125                         break;
1126                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1127                         break; /* for now we ignore it */
1128                 case USB_CDC_ACM_TYPE:
1129                         ac_management_function = buffer[3];
1130                         break;
1131                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1132                         call_management_function = buffer[3];
1133                         call_interface_num = buffer[4];
1134                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1135                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1136                         break;
1137                 default:
1138                         /* there are LOTS more CDC descriptors that
1139                          * could legitimately be found here.
1140                          */
1141                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1142                                         "type %02x, length %d\n",
1143                                         buffer[2], buffer[0]);
1144                         break;
1145                 }
1146 next_desc:
1147                 buflen -= buffer[0];
1148                 buffer += buffer[0];
1149         }
1150
1151         if (!union_header) {
1152                 if (call_interface_num > 0) {
1153                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1154                         /* quirks for Droids MuIn LCD */
1155                         if (quirks & NO_DATA_INTERFACE)
1156                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1157                         else
1158                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1159                         control_interface = intf;
1160                 } else {
1161                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1162                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1163                                 return -ENODEV;
1164                         } else {
1165                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1166                                 combined_interfaces = 1;
1167                                 control_interface = data_interface = intf;
1168                                 goto look_for_collapsed_interface;
1169                         }
1170                 }
1171         } else {
1172                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1173                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1174                 if (!control_interface || !data_interface) {
1175                         dev_dbg(&intf->dev, "no interfaces\n");
1176                         return -ENODEV;
1177                 }
1178         }
1179
1180         if (data_interface_num != call_interface_num)
1181                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1182
1183         if (control_interface == data_interface) {
1184                 /* some broken devices designed for windows work this way */
1185                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1186                 combined_interfaces = 1;
1187                 /* a popular other OS doesn't use it */
1188                 quirks |= NO_CAP_LINE;
1189                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1190                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1191                         return -EINVAL;
1192                 }
1193 look_for_collapsed_interface:
1194                 for (i = 0; i < 3; i++) {
1195                         struct usb_endpoint_descriptor *ep;
1196                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1197
1198                         if (usb_endpoint_is_int_in(ep))
1199                                 epctrl = ep;
1200                         else if (usb_endpoint_is_bulk_out(ep))
1201                                 epwrite = ep;
1202                         else if (usb_endpoint_is_bulk_in(ep))
1203                                 epread = ep;
1204                         else
1205                                 return -EINVAL;
1206                 }
1207                 if (!epctrl || !epread || !epwrite)
1208                         return -ENODEV;
1209                 else
1210                         goto made_compressed_probe;
1211         }
1212
1213 skip_normal_probe:
1214
1215         /*workaround for switched interfaces */
1216         if (data_interface->cur_altsetting->desc.bInterfaceClass
1217                                                 != CDC_DATA_INTERFACE_TYPE) {
1218                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1219                                                 == CDC_DATA_INTERFACE_TYPE) {
1220                         struct usb_interface *t;
1221                         dev_dbg(&intf->dev,
1222                                 "Your device has switched interfaces.\n");
1223                         t = control_interface;
1224                         control_interface = data_interface;
1225                         data_interface = t;
1226                 } else {
1227                         return -EINVAL;
1228                 }
1229         }
1230
1231         /* Accept probe requests only for the control interface */
1232         if (!combined_interfaces && intf != control_interface)
1233                 return -ENODEV;
1234
1235         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1236                 /* valid in this context */
1237                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1238                 return -EBUSY;
1239         }
1240
1241
1242         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1243             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1244                 return -EINVAL;
1245
1246         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1247         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1248         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1249
1250
1251         /* workaround for switched endpoints */
1252         if (!usb_endpoint_dir_in(epread)) {
1253                 /* descriptors are swapped */
1254                 struct usb_endpoint_descriptor *t;
1255                 dev_dbg(&intf->dev,
1256                         "The data interface has switched endpoints\n");
1257                 t = epread;
1258                 epread = epwrite;
1259                 epwrite = t;
1260         }
1261 made_compressed_probe:
1262         dev_dbg(&intf->dev, "interfaces are valid\n");
1263
1264         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1265         if (acm == NULL) {
1266                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1267                 goto alloc_fail;
1268         }
1269
1270         minor = acm_alloc_minor(acm);
1271         if (minor == ACM_TTY_MINORS) {
1272                 dev_err(&intf->dev, "no more free acm devices\n");
1273                 kfree(acm);
1274                 return -ENODEV;
1275         }
1276
1277         ctrlsize = usb_endpoint_maxp(epctrl);
1278         readsize = usb_endpoint_maxp(epread) *
1279                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1280         acm->combined_interfaces = combined_interfaces;
1281         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1282         acm->control = control_interface;
1283         acm->data = data_interface;
1284         acm->minor = minor;
1285         acm->dev = usb_dev;
1286         acm->ctrl_caps = ac_management_function;
1287         if (quirks & NO_CAP_LINE)
1288                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1289         acm->ctrlsize = ctrlsize;
1290         acm->readsize = readsize;
1291         acm->rx_buflimit = num_rx_buf;
1292         INIT_WORK(&acm->work, acm_softint);
1293         init_waitqueue_head(&acm->wioctl);
1294         spin_lock_init(&acm->write_lock);
1295         spin_lock_init(&acm->read_lock);
1296         mutex_init(&acm->mutex);
1297         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1298         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1299         if (acm->is_int_ep)
1300                 acm->bInterval = epread->bInterval;
1301         tty_port_init(&acm->port);
1302         acm->port.ops = &acm_port_ops;
1303         init_usb_anchor(&acm->delayed);
1304
1305         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1306         if (!buf) {
1307                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1308                 goto alloc_fail2;
1309         }
1310         acm->ctrl_buffer = buf;
1311
1312         if (acm_write_buffers_alloc(acm) < 0) {
1313                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1314                 goto alloc_fail4;
1315         }
1316
1317         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1318         if (!acm->ctrlurb) {
1319                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1320                 goto alloc_fail5;
1321         }
1322         for (i = 0; i < num_rx_buf; i++) {
1323                 struct acm_rb *rb = &(acm->read_buffers[i]);
1324                 struct urb *urb;
1325
1326                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1327                                                                 &rb->dma);
1328                 if (!rb->base) {
1329                         dev_err(&intf->dev, "out of memory "
1330                                         "(read bufs usb_alloc_coherent)\n");
1331                         goto alloc_fail6;
1332                 }
1333                 rb->index = i;
1334                 rb->instance = acm;
1335
1336                 urb = usb_alloc_urb(0, GFP_KERNEL);
1337                 if (!urb) {
1338                         dev_err(&intf->dev,
1339                                 "out of memory (read urbs usb_alloc_urb)\n");
1340                         goto alloc_fail6;
1341                 }
1342                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1343                 urb->transfer_dma = rb->dma;
1344                 if (acm->is_int_ep) {
1345                         usb_fill_int_urb(urb, acm->dev,
1346                                          acm->rx_endpoint,
1347                                          rb->base,
1348                                          acm->readsize,
1349                                          acm_read_bulk_callback, rb,
1350                                          acm->bInterval);
1351                 } else {
1352                         usb_fill_bulk_urb(urb, acm->dev,
1353                                           acm->rx_endpoint,
1354                                           rb->base,
1355                                           acm->readsize,
1356                                           acm_read_bulk_callback, rb);
1357                 }
1358
1359                 acm->read_urbs[i] = urb;
1360                 __set_bit(i, &acm->read_urbs_free);
1361         }
1362         for (i = 0; i < ACM_NW; i++) {
1363                 struct acm_wb *snd = &(acm->wb[i]);
1364
1365                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1366                 if (snd->urb == NULL) {
1367                         dev_err(&intf->dev,
1368                                 "out of memory (write urbs usb_alloc_urb)\n");
1369                         goto alloc_fail7;
1370                 }
1371
1372                 if (usb_endpoint_xfer_int(epwrite))
1373                         usb_fill_int_urb(snd->urb, usb_dev,
1374                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1375                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1376                 else
1377                         usb_fill_bulk_urb(snd->urb, usb_dev,
1378                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1379                                 NULL, acm->writesize, acm_write_bulk, snd);
1380                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1381                 snd->instance = acm;
1382         }
1383
1384         usb_set_intfdata(intf, acm);
1385
1386         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1387         if (i < 0)
1388                 goto alloc_fail7;
1389
1390         if (cfd) { /* export the country data */
1391                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1392                 if (!acm->country_codes)
1393                         goto skip_countries;
1394                 acm->country_code_size = cfd->bLength - 4;
1395                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1396                                                         cfd->bLength - 4);
1397                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1398
1399                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1400                 if (i < 0) {
1401                         kfree(acm->country_codes);
1402                         acm->country_codes = NULL;
1403                         acm->country_code_size = 0;
1404                         goto skip_countries;
1405                 }
1406
1407                 i = device_create_file(&intf->dev,
1408                                                 &dev_attr_iCountryCodeRelDate);
1409                 if (i < 0) {
1410                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1411                         kfree(acm->country_codes);
1412                         acm->country_codes = NULL;
1413                         acm->country_code_size = 0;
1414                         goto skip_countries;
1415                 }
1416         }
1417
1418 skip_countries:
1419         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1420                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1421                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1422                          /* works around buggy devices */
1423                          epctrl->bInterval ? epctrl->bInterval : 16);
1424         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1425         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1426
1427         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1428
1429         acm_set_control(acm, acm->ctrlout);
1430
1431         acm->line.dwDTERate = cpu_to_le32(9600);
1432         acm->line.bDataBits = 8;
1433         acm_set_line(acm, &acm->line);
1434
1435         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1436         usb_set_intfdata(data_interface, acm);
1437
1438         usb_get_intf(control_interface);
1439         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1440                         &control_interface->dev);
1441         if (IS_ERR(tty_dev)) {
1442                 rv = PTR_ERR(tty_dev);
1443                 goto alloc_fail8;
1444         }
1445
1446         return 0;
1447 alloc_fail8:
1448         if (acm->country_codes) {
1449                 device_remove_file(&acm->control->dev,
1450                                 &dev_attr_wCountryCodes);
1451                 device_remove_file(&acm->control->dev,
1452                                 &dev_attr_iCountryCodeRelDate);
1453         }
1454         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1455 alloc_fail7:
1456         usb_set_intfdata(intf, NULL);
1457         for (i = 0; i < ACM_NW; i++)
1458                 usb_free_urb(acm->wb[i].urb);
1459 alloc_fail6:
1460         for (i = 0; i < num_rx_buf; i++)
1461                 usb_free_urb(acm->read_urbs[i]);
1462         acm_read_buffers_free(acm);
1463         usb_free_urb(acm->ctrlurb);
1464 alloc_fail5:
1465         acm_write_buffers_free(acm);
1466 alloc_fail4:
1467         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1468 alloc_fail2:
1469         acm_release_minor(acm);
1470         kfree(acm);
1471 alloc_fail:
1472         return rv;
1473 }
1474
1475 static void stop_data_traffic(struct acm *acm)
1476 {
1477         int i;
1478
1479         dev_dbg(&acm->control->dev, "%s\n", __func__);
1480
1481         usb_kill_urb(acm->ctrlurb);
1482         for (i = 0; i < ACM_NW; i++)
1483                 usb_kill_urb(acm->wb[i].urb);
1484         for (i = 0; i < acm->rx_buflimit; i++)
1485                 usb_kill_urb(acm->read_urbs[i]);
1486
1487         cancel_work_sync(&acm->work);
1488 }
1489
1490 static void acm_disconnect(struct usb_interface *intf)
1491 {
1492         struct acm *acm = usb_get_intfdata(intf);
1493         struct usb_device *usb_dev = interface_to_usbdev(intf);
1494         struct tty_struct *tty;
1495         int i;
1496
1497         dev_dbg(&intf->dev, "%s\n", __func__);
1498
1499         /* sibling interface is already cleaning up */
1500         if (!acm)
1501                 return;
1502
1503         mutex_lock(&acm->mutex);
1504         acm->disconnected = true;
1505         if (acm->country_codes) {
1506                 device_remove_file(&acm->control->dev,
1507                                 &dev_attr_wCountryCodes);
1508                 device_remove_file(&acm->control->dev,
1509                                 &dev_attr_iCountryCodeRelDate);
1510         }
1511         wake_up_all(&acm->wioctl);
1512         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1513         usb_set_intfdata(acm->control, NULL);
1514         usb_set_intfdata(acm->data, NULL);
1515         mutex_unlock(&acm->mutex);
1516
1517         tty = tty_port_tty_get(&acm->port);
1518         if (tty) {
1519                 tty_vhangup(tty);
1520                 tty_kref_put(tty);
1521         }
1522
1523         stop_data_traffic(acm);
1524
1525         tty_unregister_device(acm_tty_driver, acm->minor);
1526
1527         usb_free_urb(acm->ctrlurb);
1528         for (i = 0; i < ACM_NW; i++)
1529                 usb_free_urb(acm->wb[i].urb);
1530         for (i = 0; i < acm->rx_buflimit; i++)
1531                 usb_free_urb(acm->read_urbs[i]);
1532         acm_write_buffers_free(acm);
1533         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1534         acm_read_buffers_free(acm);
1535
1536         if (!acm->combined_interfaces)
1537                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1538                                         acm->data : acm->control);
1539
1540         tty_port_put(&acm->port);
1541 }
1542
1543 #ifdef CONFIG_PM
1544 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1545 {
1546         struct acm *acm = usb_get_intfdata(intf);
1547         int cnt;
1548
1549         spin_lock_irq(&acm->write_lock);
1550         if (PMSG_IS_AUTO(message)) {
1551                 if (acm->transmitting) {
1552                         spin_unlock_irq(&acm->write_lock);
1553                         return -EBUSY;
1554                 }
1555         }
1556         cnt = acm->susp_count++;
1557         spin_unlock_irq(&acm->write_lock);
1558
1559         if (cnt)
1560                 return 0;
1561
1562         stop_data_traffic(acm);
1563
1564         return 0;
1565 }
1566
1567 static int acm_resume(struct usb_interface *intf)
1568 {
1569         struct acm *acm = usb_get_intfdata(intf);
1570         struct urb *urb;
1571         int rv = 0;
1572
1573         spin_lock_irq(&acm->write_lock);
1574
1575         if (--acm->susp_count)
1576                 goto out;
1577
1578         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1579                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1580
1581                 for (;;) {
1582                         urb = usb_get_from_anchor(&acm->delayed);
1583                         if (!urb)
1584                                 break;
1585
1586                         acm_start_wb(acm, urb->context);
1587                 }
1588
1589                 /*
1590                  * delayed error checking because we must
1591                  * do the write path at all cost
1592                  */
1593                 if (rv < 0)
1594                         goto out;
1595
1596                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1597         }
1598 out:
1599         spin_unlock_irq(&acm->write_lock);
1600
1601         return rv;
1602 }
1603
1604 static int acm_reset_resume(struct usb_interface *intf)
1605 {
1606         struct acm *acm = usb_get_intfdata(intf);
1607
1608         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1609                 tty_port_tty_hangup(&acm->port, false);
1610
1611         return acm_resume(intf);
1612 }
1613
1614 #endif /* CONFIG_PM */
1615
1616 #define NOKIA_PCSUITE_ACM_INFO(x) \
1617                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1618                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1619                 USB_CDC_ACM_PROTO_VENDOR)
1620
1621 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1622                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1623                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1624                 USB_CDC_ACM_PROTO_VENDOR)
1625
1626 /*
1627  * USB driver structure.
1628  */
1629
1630 static const struct usb_device_id acm_ids[] = {
1631         /* quirky and broken devices */
1632         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1633         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1634         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1635         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1636         },
1637         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1638         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1639         },
1640         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1641         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1642         },
1643         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1644         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1645         },
1646         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1647         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1648         },
1649         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1650         .driver_info = SINGLE_RX_URB,
1651         },
1652         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1653         .driver_info = SINGLE_RX_URB, /* firmware bug */
1654         },
1655         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1656         .driver_info = SINGLE_RX_URB, /* firmware bug */
1657         },
1658         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1659         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1660         },
1661         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1662         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1663         },
1664         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1665         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1666         },
1667         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1668         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1669         },
1670         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1671         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1672         },
1673         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1674         },
1675         /* Motorola H24 HSPA module: */
1676         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1677         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1678         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1679         },
1680         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1681         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1682         },
1683         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1684         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1685         },
1686         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1687         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1688         },
1689         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1690         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1691         },
1692         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1693         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1694         },
1695         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1696         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1697         },
1698
1699         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1700         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1701                                            data interface instead of
1702                                            communications interface.
1703                                            Maybe we should define a new
1704                                            quirk for this. */
1705         },
1706         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1707         .driver_info = NO_UNION_NORMAL,
1708         },
1709         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1710         .driver_info = NO_UNION_NORMAL,
1711         },
1712         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1713         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1714         },
1715         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1716         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1717         },
1718
1719         /* Nokia S60 phones expose two ACM channels. The first is
1720          * a modem and is picked up by the standard AT-command
1721          * information below. The second is 'vendor-specific' but
1722          * is treated as a serial device at the S60 end, so we want
1723          * to expose it on Linux too. */
1724         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1725         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1726         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1727         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1728         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1729         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1730         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1731         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1732         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1733         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1734         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1735         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1736         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1737         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1738         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1739         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1740         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1741         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1742         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1743         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1744         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1745         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1746         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1747         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1748         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1749         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1750         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1751         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1752         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1753         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1754         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1755         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1756         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1757         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1758         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1759         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1760         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1761         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1762         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1763         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1764         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1765         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1766         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1767         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1768         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1769         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1770         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1771         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1772         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1773         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1774         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1775         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1776         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1777         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1778         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1779         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1780         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1781         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1782
1783         /* Support for Owen devices */
1784         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1785
1786         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1787
1788         /* Support Lego NXT using pbLua firmware */
1789         { USB_DEVICE(0x0694, 0xff00),
1790         .driver_info = NOT_A_MODEM,
1791         },
1792
1793         /* Support for Droids MuIn LCD */
1794         { USB_DEVICE(0x04d8, 0x000b),
1795         .driver_info = NO_DATA_INTERFACE,
1796         },
1797
1798 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1799         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1800         .driver_info = IGNORE_DEVICE,
1801         },
1802         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1803         .driver_info = IGNORE_DEVICE,
1804         },
1805 #endif
1806
1807         /* control interfaces without any protocol set */
1808         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1809                 USB_CDC_PROTO_NONE) },
1810
1811         /* control interfaces with various AT-command sets */
1812         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1813                 USB_CDC_ACM_PROTO_AT_V25TER) },
1814         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1815                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1816         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1817                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1818         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1819                 USB_CDC_ACM_PROTO_AT_GSM) },
1820         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1821                 USB_CDC_ACM_PROTO_AT_3G) },
1822         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1823                 USB_CDC_ACM_PROTO_AT_CDMA) },
1824
1825         { }
1826 };
1827
1828 MODULE_DEVICE_TABLE(usb, acm_ids);
1829
1830 static struct usb_driver acm_driver = {
1831         .name =         "cdc_acm",
1832         .probe =        acm_probe,
1833         .disconnect =   acm_disconnect,
1834 #ifdef CONFIG_PM
1835         .suspend =      acm_suspend,
1836         .resume =       acm_resume,
1837         .reset_resume = acm_reset_resume,
1838 #endif
1839         .id_table =     acm_ids,
1840 #ifdef CONFIG_PM
1841         .supports_autosuspend = 1,
1842 #endif
1843         .disable_hub_initiated_lpm = 1,
1844 };
1845
1846 /*
1847  * TTY driver structures.
1848  */
1849
1850 static const struct tty_operations acm_ops = {
1851         .install =              acm_tty_install,
1852         .open =                 acm_tty_open,
1853         .close =                acm_tty_close,
1854         .cleanup =              acm_tty_cleanup,
1855         .hangup =               acm_tty_hangup,
1856         .write =                acm_tty_write,
1857         .write_room =           acm_tty_write_room,
1858         .ioctl =                acm_tty_ioctl,
1859         .throttle =             acm_tty_throttle,
1860         .unthrottle =           acm_tty_unthrottle,
1861         .chars_in_buffer =      acm_tty_chars_in_buffer,
1862         .break_ctl =            acm_tty_break_ctl,
1863         .set_termios =          acm_tty_set_termios,
1864         .tiocmget =             acm_tty_tiocmget,
1865         .tiocmset =             acm_tty_tiocmset,
1866 };
1867
1868 /*
1869  * Init / exit.
1870  */
1871
1872 static int __init acm_init(void)
1873 {
1874         int retval;
1875         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1876         if (!acm_tty_driver)
1877                 return -ENOMEM;
1878         acm_tty_driver->driver_name = "acm",
1879         acm_tty_driver->name = "ttyACM",
1880         acm_tty_driver->major = ACM_TTY_MAJOR,
1881         acm_tty_driver->minor_start = 0,
1882         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1883         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1884         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1885         acm_tty_driver->init_termios = tty_std_termios;
1886         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1887                                                                 HUPCL | CLOCAL;
1888         tty_set_operations(acm_tty_driver, &acm_ops);
1889
1890         retval = tty_register_driver(acm_tty_driver);
1891         if (retval) {
1892                 put_tty_driver(acm_tty_driver);
1893                 return retval;
1894         }
1895
1896         retval = usb_register(&acm_driver);
1897         if (retval) {
1898                 tty_unregister_driver(acm_tty_driver);
1899                 put_tty_driver(acm_tty_driver);
1900                 return retval;
1901         }
1902
1903         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1904
1905         return 0;
1906 }
1907
1908 static void __exit acm_exit(void)
1909 {
1910         usb_deregister(&acm_driver);
1911         tty_unregister_driver(acm_tty_driver);
1912         put_tty_driver(acm_tty_driver);
1913 }
1914
1915 module_init(acm_init);
1916 module_exit(acm_exit);
1917
1918 MODULE_AUTHOR(DRIVER_AUTHOR);
1919 MODULE_DESCRIPTION(DRIVER_DESC);
1920 MODULE_LICENSE("GPL");
1921 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);