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 && !acm->susp_count) {
 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
 510         dev_dbg(&acm->control->dev, "%s\n", __func__);
 511
 512         mutex_lock(&acm->mutex);
 513         if (acm->disconnected)
 514                 goto disconnected;
 515
 516         retval = usb_autopm_get_interface(acm->control);
 517         if (retval)
 518                 goto error_get_interface;
 519
 520         /*
 521          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 522          * memory is really nasty...
 523          */
 524         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 525         acm->control->needs_remote_wakeup = 1;
 526
 527         acm->ctrlurb->dev = acm->dev;
 528         if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
 529                 dev_err(&acm->control->dev,
 530                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 531                 usb_autopm_put_interface(acm->control);
 532                 goto error_submit_urb;
 533         }
 534
 535         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
 536         if (acm_set_control(acm, acm->ctrlout) < 0 &&
 537             (acm->ctrl_caps & USB_CDC_CAP_LINE)) {
 538                 usb_autopm_put_interface(acm->control);
 539                 goto error_set_control;
 540         }
 541
 542         usb_autopm_put_interface(acm->control);
 543
 544         /*
 545          * Unthrottle device in case the TTY was closed while throttled.
 546          */
 547         spin_lock_irq(&acm->read_lock);
 548         acm->throttled = 0;
 549         acm->throttle_req = 0;
 550         spin_unlock_irq(&acm->read_lock);
 551
 552         if (acm_submit_read_urbs(acm, GFP_KERNEL))
 553                 goto error_submit_read_urbs;
 554
 555         mutex_unlock(&acm->mutex);
 556
 557         return 0;
 558
 559 error_submit_read_urbs:
 560         acm->ctrlout = 0;
 561         acm_set_control(acm, acm->ctrlout);
 562 error_set_control:
 563         usb_kill_urb(acm->ctrlurb);
 564 error_submit_urb:
 565 error_get_interface:
 566 disconnected:
 567         mutex_unlock(&acm->mutex);
 568         return retval;
 569 }
 570
 571 static void acm_port_destruct(struct tty_port *port)
 572 {
 573         struct acm *acm = container_of(port, struct acm, port);
 574
 575         dev_dbg(&acm->control->dev, "%s\n", __func__);
 576
 577         acm_release_minor(acm);
 578         usb_put_intf(acm->control);
 579         kfree(acm->country_codes);
 580         kfree(acm);
 581 }
 582
 583 static void acm_port_shutdown(struct tty_port *port)
 584 {
 585         struct acm *acm = container_of(port, struct acm, port);
 586         struct urb *urb;
 587         struct acm_wb *wb;
 588         int i;
 589
 590         dev_dbg(&acm->control->dev, "%s\n", __func__);
 591
 592         mutex_lock(&acm->mutex);
 593         if (!acm->disconnected) {
 594                 usb_autopm_get_interface(acm->control);
 595                 acm_set_control(acm, acm->ctrlout = 0);
 596
 597                 for (;;) {
 598                         urb = usb_get_from_anchor(&acm->delayed);
 599                         if (!urb)
 600                                 break;
 601                         wb = urb->context;
 602                         wb->use = 0;
 603                         usb_autopm_put_interface_async(acm->control);
 604                 }
 605
 606                 usb_kill_urb(acm->ctrlurb);
 607                 for (i = 0; i < ACM_NW; i++)
 608                         usb_kill_urb(acm->wb[i].urb);
 609                 for (i = 0; i < acm->rx_buflimit; i++)
 610                         usb_kill_urb(acm->read_urbs[i]);
 611                 acm->control->needs_remote_wakeup = 0;
 612                 usb_autopm_put_interface(acm->control);
 613         }
 614         mutex_unlock(&acm->mutex);
 615 }
 616
 617 static void acm_tty_cleanup(struct tty_struct *tty)
 618 {
 619         struct acm *acm = tty->driver_data;
 620         dev_dbg(&acm->control->dev, "%s\n", __func__);
 621         tty_port_put(&acm->port);
 622 }
 623
 624 static void acm_tty_hangup(struct tty_struct *tty)
 625 {
 626         struct acm *acm = tty->driver_data;
 627         dev_dbg(&acm->control->dev, "%s\n", __func__);
 628         tty_port_hangup(&acm->port);
 629 }
 630
 631 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 632 {
 633         struct acm *acm = tty->driver_data;
 634         dev_dbg(&acm->control->dev, "%s\n", __func__);
 635         tty_port_close(&acm->port, tty, filp);
 636 }
 637
 638 static int acm_tty_write(struct tty_struct *tty,
 639                                         const unsigned char *buf, int count)
 640 {
 641         struct acm *acm = tty->driver_data;
 642         int stat;
 643         unsigned long flags;
 644         int wbn;
 645         struct acm_wb *wb;
 646
 647         if (!count)
 648                 return 0;
 649
 650         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 651
 652         spin_lock_irqsave(&acm->write_lock, flags);
 653         wbn = acm_wb_alloc(acm);
 654         if (wbn < 0) {
 655                 spin_unlock_irqrestore(&acm->write_lock, flags);
 656                 return 0;
 657         }
 658         wb = &acm->wb[wbn];
 659
 660         if (!acm->dev) {
 661                 wb->use = 0;
 662                 spin_unlock_irqrestore(&acm->write_lock, flags);
 663                 return -ENODEV;
 664         }
 665
 666         count = (count > acm->writesize) ? acm->writesize : count;
 667         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 668         memcpy(wb->buf, buf, count);
 669         wb->len = count;
 670
 671         usb_autopm_get_interface_async(acm->control);
 672         if (acm->susp_count) {
 673                 usb_anchor_urb(wb->urb, &acm->delayed);
 674                 spin_unlock_irqrestore(&acm->write_lock, flags);
 675                 return count;
 676         }
 677         usb_mark_last_busy(acm->dev);
 678
 679         stat = acm_start_wb(acm, wb);
 680         spin_unlock_irqrestore(&acm->write_lock, flags);
 681
 682         if (stat < 0)
 683                 return stat;
 684         return count;
 685 }
 686
 687 static int acm_tty_write_room(struct tty_struct *tty)
 688 {
 689         struct acm *acm = tty->driver_data;
 690         /*
 691          * Do not let the line discipline to know that we have a reserve,
 692          * or it might get too enthusiastic.
 693          */
 694         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 695 }
 696
 697 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 698 {
 699         struct acm *acm = tty->driver_data;
 700         /*
 701          * if the device was unplugged then any remaining characters fell out
 702          * of the connector ;)
 703          */
 704         if (acm->disconnected)
 705                 return 0;
 706         /*
 707          * This is inaccurate (overcounts), but it works.
 708          */
 709         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 710 }
 711
 712 static void acm_tty_throttle(struct tty_struct *tty)
 713 {
 714         struct acm *acm = tty->driver_data;
 715
 716         spin_lock_irq(&acm->read_lock);
 717         acm->throttle_req = 1;
 718         spin_unlock_irq(&acm->read_lock);
 719 }
 720
 721 static void acm_tty_unthrottle(struct tty_struct *tty)
 722 {
 723         struct acm *acm = tty->driver_data;
 724         unsigned int was_throttled;
 725
 726         spin_lock_irq(&acm->read_lock);
 727         was_throttled = acm->throttled;
 728         acm->throttled = 0;
 729         acm->throttle_req = 0;
 730         spin_unlock_irq(&acm->read_lock);
 731
 732         if (was_throttled)
 733                 acm_submit_read_urbs(acm, GFP_KERNEL);
 734 }
 735
 736 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 737 {
 738         struct acm *acm = tty->driver_data;
 739         int retval;
 740
 741         retval = acm_send_break(acm, state ? 0xffff : 0);
 742         if (retval < 0)
 743                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 744                                                                 __func__);
 745         return retval;
 746 }
 747
 748 static int acm_tty_tiocmget(struct tty_struct *tty)
 749 {
 750         struct acm *acm = tty->driver_data;
 751
 752         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 753                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 754                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 755                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 756                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 757                TIOCM_CTS;
 758 }
 759
 760 static int acm_tty_tiocmset(struct tty_struct *tty,
 761                             unsigned int set, unsigned int clear)
 762 {
 763         struct acm *acm = tty->driver_data;
 764         unsigned int newctrl;
 765
 766         newctrl = acm->ctrlout;
 767         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 768                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 769         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 770                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 771
 772         newctrl = (newctrl & ~clear) | set;
 773
 774         if (acm->ctrlout == newctrl)
 775                 return 0;
 776         return acm_set_control(acm, acm->ctrlout = newctrl);
 777 }
 778
 779 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 780 {
 781         struct serial_struct tmp;
 782
 783         if (!info)
 784                 return -EINVAL;
 785
 786         memset(&tmp, 0, sizeof(tmp));
 787         tmp.flags = ASYNC_LOW_LATENCY;
 788         tmp.xmit_fifo_size = acm->writesize;
 789         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 790         tmp.close_delay = acm->port.close_delay / 10;
 791         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 792                                 ASYNC_CLOSING_WAIT_NONE :
 793                                 acm->port.closing_wait / 10;
 794
 795         if (copy_to_user(info, &tmp, sizeof(tmp)))
 796                 return -EFAULT;
 797         else
 798                 return 0;
 799 }
 800
 801 static int set_serial_info(struct acm *acm,
 802                                 struct serial_struct __user *newinfo)
 803 {
 804         struct serial_struct new_serial;
 805         unsigned int closing_wait, close_delay;
 806         int retval = 0;
 807
 808         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 809                 return -EFAULT;
 810
 811         close_delay = new_serial.close_delay * 10;
 812         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 813                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 814
 815         mutex_lock(&acm->port.mutex);
 816
 817         if (!capable(CAP_SYS_ADMIN)) {
 818                 if ((close_delay != acm->port.close_delay) ||
 819                     (closing_wait != acm->port.closing_wait))
 820                         retval = -EPERM;
 821                 else
 822                         retval = -EOPNOTSUPP;
 823         } else {
 824                 acm->port.close_delay  = close_delay;
 825                 acm->port.closing_wait = closing_wait;
 826         }
 827
 828         mutex_unlock(&acm->port.mutex);
 829         return retval;
 830 }
 831
 832 static int wait_serial_change(struct acm *acm, unsigned long arg)
 833 {
 834         int rv = 0;
 835         DECLARE_WAITQUEUE(wait, current);
 836         struct async_icount old, new;
 837
 838         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
 839                 return -EINVAL;
 840         do {
 841                 spin_lock_irq(&acm->read_lock);
 842                 old = acm->oldcount;
 843                 new = acm->iocount;
 844                 acm->oldcount = new;
 845                 spin_unlock_irq(&acm->read_lock);
 846
 847                 if ((arg & TIOCM_DSR) &&
 848                         old.dsr != new.dsr)
 849                         break;
 850                 if ((arg & TIOCM_CD)  &&
 851                         old.dcd != new.dcd)
 852                         break;
 853                 if ((arg & TIOCM_RI) &&
 854                         old.rng != new.rng)
 855                         break;
 856
 857                 add_wait_queue(&acm->wioctl, &wait);
 858                 set_current_state(TASK_INTERRUPTIBLE);
 859                 schedule();
 860                 remove_wait_queue(&acm->wioctl, &wait);
 861                 if (acm->disconnected) {
 862                         if (arg & TIOCM_CD)
 863                                 break;
 864                         else
 865                                 rv = -ENODEV;
 866                 } else {
 867                         if (signal_pending(current))
 868                                 rv = -ERESTARTSYS;
 869                 }
 870         } while (!rv);
 871
 872
 873
 874         return rv;
 875 }
 876
 877 static int get_serial_usage(struct acm *acm,
 878                             struct serial_icounter_struct __user *count)
 879 {
 880         struct serial_icounter_struct icount;
 881         int rv = 0;
 882
 883         memset(&icount, 0, sizeof(icount));
 884         icount.dsr = acm->iocount.dsr;
 885         icount.rng = acm->iocount.rng;
 886         icount.dcd = acm->iocount.dcd;
 887         icount.frame = acm->iocount.frame;
 888         icount.overrun = acm->iocount.overrun;
 889         icount.parity = acm->iocount.parity;
 890         icount.brk = acm->iocount.brk;
 891
 892         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 893                 rv = -EFAULT;
 894
 895         return rv;
 896 }
 897
 898 static int acm_tty_ioctl(struct tty_struct *tty,
 899                                         unsigned int cmd, unsigned long arg)
 900 {
 901         struct acm *acm = tty->driver_data;
 902         int rv = -ENOIOCTLCMD;
 903
 904         switch (cmd) {
 905         case TIOCGSERIAL: /* gets serial port data */
 906                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 907                 break;
 908         case TIOCSSERIAL:
 909                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 910                 break;
 911         case TIOCMIWAIT:
 912                 rv = usb_autopm_get_interface(acm->control);
 913                 if (rv < 0) {
 914                         rv = -EIO;
 915                         break;
 916                 }
 917                 rv = wait_serial_change(acm, arg);
 918                 usb_autopm_put_interface(acm->control);
 919                 break;
 920         case TIOCGICOUNT:
 921                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
 922                 break;
 923         }
 924
 925         return rv;
 926 }
 927
 928 static void acm_tty_set_termios(struct tty_struct *tty,
 929                                                 struct ktermios *termios_old)
 930 {
 931         struct acm *acm = tty->driver_data;
 932         struct ktermios *termios = &tty->termios;
 933         struct usb_cdc_line_coding newline;
 934         int newctrl = acm->ctrlout;
 935
 936         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 937         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 938         newline.bParityType = termios->c_cflag & PARENB ?
 939                                 (termios->c_cflag & PARODD ? 1 : 2) +
 940                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 941         switch (termios->c_cflag & CSIZE) {
 942         case CS5:
 943                 newline.bDataBits = 5;
 944                 break;
 945         case CS6:
 946                 newline.bDataBits = 6;
 947                 break;
 948         case CS7:
 949                 newline.bDataBits = 7;
 950                 break;
 951         case CS8:
 952         default:
 953                 newline.bDataBits = 8;
 954                 break;
 955         }
 956         /* FIXME: Needs to clear unsupported bits in the termios */
 957         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 958
 959         if (!newline.dwDTERate) {
 960                 newline.dwDTERate = acm->line.dwDTERate;
 961                 newctrl &= ~ACM_CTRL_DTR;
 962         } else
 963                 newctrl |=  ACM_CTRL_DTR;
 964
 965         if (newctrl != acm->ctrlout)
 966                 acm_set_control(acm, acm->ctrlout = newctrl);
 967
 968         if (memcmp(&acm->line, &newline, sizeof newline)) {
 969                 memcpy(&acm->line, &newline, sizeof newline);
 970                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 971                         __func__,
 972                         le32_to_cpu(newline.dwDTERate),
 973                         newline.bCharFormat, newline.bParityType,
 974                         newline.bDataBits);
 975                 acm_set_line(acm, &acm->line);
 976         }
 977 }
 978
 979 static const struct tty_port_operations acm_port_ops = {
 980         .shutdown = acm_port_shutdown,
 981         .activate = acm_port_activate,
 982         .destruct = acm_port_destruct,
 983 };
 984
 985 /*
 986  * USB probe and disconnect routines.
 987  */
 988
 989 /* Little helpers: write/read buffers free */
 990 static void acm_write_buffers_free(struct acm *acm)
 991 {
 992         int i;
 993         struct acm_wb *wb;
 994         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 995
 996         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
 997                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
 998 }
 999
1000 static void acm_read_buffers_free(struct acm *acm)
1001 {
1002         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1003         int i;
1004
1005         for (i = 0; i < acm->rx_buflimit; i++)
1006                 usb_free_coherent(usb_dev, acm->readsize,
1007                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1008 }
1009
1010 /* Little helper: write buffers allocate */
1011 static int acm_write_buffers_alloc(struct acm *acm)
1012 {
1013         int i;
1014         struct acm_wb *wb;
1015
1016         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1017                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1018                     &wb->dmah);
1019                 if (!wb->buf) {
1020                         while (i != 0) {
1021                                 --i;
1022                                 --wb;
1023                                 usb_free_coherent(acm->dev, acm->writesize,
1024                                     wb->buf, wb->dmah);
1025                         }
1026                         return -ENOMEM;
1027                 }
1028         }
1029         return 0;
1030 }
1031
1032 static int acm_probe(struct usb_interface *intf,
1033                      const struct usb_device_id *id)
1034 {
1035         struct usb_cdc_union_desc *union_header = NULL;
1036         struct usb_cdc_country_functional_desc *cfd = NULL;
1037         unsigned char *buffer = intf->altsetting->extra;
1038         int buflen = intf->altsetting->extralen;
1039         struct usb_interface *control_interface;
1040         struct usb_interface *data_interface;
1041         struct usb_endpoint_descriptor *epctrl = NULL;
1042         struct usb_endpoint_descriptor *epread = NULL;
1043         struct usb_endpoint_descriptor *epwrite = NULL;
1044         struct usb_device *usb_dev = interface_to_usbdev(intf);
1045         struct acm *acm;
1046         int minor;
1047         int ctrlsize, readsize;
1048         u8 *buf;
1049         u8 ac_management_function = 0;
1050         u8 call_management_function = 0;
1051         int call_interface_num = -1;
1052         int data_interface_num = -1;
1053         unsigned long quirks;
1054         int num_rx_buf;
1055         int i;
1056         int combined_interfaces = 0;
1057         struct device *tty_dev;
1058         int rv = -ENOMEM;
1059
1060         /* normal quirks */
1061         quirks = (unsigned long)id->driver_info;
1062
1063         if (quirks == IGNORE_DEVICE)
1064                 return -ENODEV;
1065
1066         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1067
1068         /* handle quirks deadly to normal probing*/
1069         if (quirks == NO_UNION_NORMAL) {
1070                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1071                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1072                 goto skip_normal_probe;
1073         }
1074
1075         /* normal probing*/
1076         if (!buffer) {
1077                 dev_err(&intf->dev, "Weird descriptor references\n");
1078                 return -EINVAL;
1079         }
1080
1081         if (!buflen) {
1082                 if (intf->cur_altsetting->endpoint &&
1083                                 intf->cur_altsetting->endpoint->extralen &&
1084                                 intf->cur_altsetting->endpoint->extra) {
1085                         dev_dbg(&intf->dev,
1086                                 "Seeking extra descriptors on endpoint\n");
1087                         buflen = intf->cur_altsetting->endpoint->extralen;
1088                         buffer = intf->cur_altsetting->endpoint->extra;
1089                 } else {
1090                         dev_err(&intf->dev,
1091                                 "Zero length descriptor references\n");
1092                         return -EINVAL;
1093                 }
1094         }
1095
1096         while (buflen > 0) {
1097                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1098                         dev_err(&intf->dev, "skipping garbage\n");
1099                         goto next_desc;
1100                 }
1101
1102                 switch (buffer[2]) {
1103                 case USB_CDC_UNION_TYPE: /* we've found it */
1104                         if (union_header) {
1105                                 dev_err(&intf->dev, "More than one "
1106                                         "union descriptor, skipping ...\n");
1107                                 goto next_desc;
1108                         }
1109                         union_header = (struct usb_cdc_union_desc *)buffer;
1110                         break;
1111                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1112                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1113                         break;
1114                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1115                         break; /* for now we ignore it */
1116                 case USB_CDC_ACM_TYPE:
1117                         ac_management_function = buffer[3];
1118                         break;
1119                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1120                         call_management_function = buffer[3];
1121                         call_interface_num = buffer[4];
1122                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1123                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1124                         break;
1125                 default:
1126                         /* there are LOTS more CDC descriptors that
1127                          * could legitimately be found here.
1128                          */
1129                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1130                                         "type %02x, length %d\n",
1131                                         buffer[2], buffer[0]);
1132                         break;
1133                 }
1134 next_desc:
1135                 buflen -= buffer[0];
1136                 buffer += buffer[0];
1137         }
1138
1139         if (!union_header) {
1140                 if (call_interface_num > 0) {
1141                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1142                         /* quirks for Droids MuIn LCD */
1143                         if (quirks & NO_DATA_INTERFACE)
1144                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1145                         else
1146                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1147                         control_interface = intf;
1148                 } else {
1149                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1150                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1151                                 return -ENODEV;
1152                         } else {
1153                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1154                                 combined_interfaces = 1;
1155                                 control_interface = data_interface = intf;
1156                                 goto look_for_collapsed_interface;
1157                         }
1158                 }
1159         } else {
1160                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1161                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1162                 if (!control_interface || !data_interface) {
1163                         dev_dbg(&intf->dev, "no interfaces\n");
1164                         return -ENODEV;
1165                 }
1166         }
1167
1168         if (data_interface_num != call_interface_num)
1169                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1170
1171         if (control_interface == data_interface) {
1172                 /* some broken devices designed for windows work this way */
1173                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1174                 combined_interfaces = 1;
1175                 /* a popular other OS doesn't use it */
1176                 quirks |= NO_CAP_LINE;
1177                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1178                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1179                         return -EINVAL;
1180                 }
1181 look_for_collapsed_interface:
1182                 for (i = 0; i < 3; i++) {
1183                         struct usb_endpoint_descriptor *ep;
1184                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1185
1186                         if (usb_endpoint_is_int_in(ep))
1187                                 epctrl = ep;
1188                         else if (usb_endpoint_is_bulk_out(ep))
1189                                 epwrite = ep;
1190                         else if (usb_endpoint_is_bulk_in(ep))
1191                                 epread = ep;
1192                         else
1193                                 return -EINVAL;
1194                 }
1195                 if (!epctrl || !epread || !epwrite)
1196                         return -ENODEV;
1197                 else
1198                         goto made_compressed_probe;
1199         }
1200
1201 skip_normal_probe:
1202
1203         /*workaround for switched interfaces */
1204         if (data_interface->cur_altsetting->desc.bInterfaceClass
1205                                                 != CDC_DATA_INTERFACE_TYPE) {
1206                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1207                                                 == CDC_DATA_INTERFACE_TYPE) {
1208                         struct usb_interface *t;
1209                         dev_dbg(&intf->dev,
1210                                 "Your device has switched interfaces.\n");
1211                         t = control_interface;
1212                         control_interface = data_interface;
1213                         data_interface = t;
1214                 } else {
1215                         return -EINVAL;
1216                 }
1217         }
1218
1219         /* Accept probe requests only for the control interface */
1220         if (!combined_interfaces && intf != control_interface)
1221                 return -ENODEV;
1222
1223         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1224                 /* valid in this context */
1225                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1226                 return -EBUSY;
1227         }
1228
1229
1230         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1231             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1232                 return -EINVAL;
1233
1234         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1235         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1236         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1237
1238
1239         /* workaround for switched endpoints */
1240         if (!usb_endpoint_dir_in(epread)) {
1241                 /* descriptors are swapped */
1242                 struct usb_endpoint_descriptor *t;
1243                 dev_dbg(&intf->dev,
1244                         "The data interface has switched endpoints\n");
1245                 t = epread;
1246                 epread = epwrite;
1247                 epwrite = t;
1248         }
1249 made_compressed_probe:
1250         dev_dbg(&intf->dev, "interfaces are valid\n");
1251
1252         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1253         if (acm == NULL) {
1254                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1255                 goto alloc_fail;
1256         }
1257
1258         minor = acm_alloc_minor(acm);
1259         if (minor == ACM_TTY_MINORS) {
1260                 dev_err(&intf->dev, "no more free acm devices\n");
1261                 kfree(acm);
1262                 return -ENODEV;
1263         }
1264
1265         ctrlsize = usb_endpoint_maxp(epctrl);
1266         readsize = usb_endpoint_maxp(epread) *
1267                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1268         acm->combined_interfaces = combined_interfaces;
1269         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1270         acm->control = control_interface;
1271         acm->data = data_interface;
1272         acm->minor = minor;
1273         acm->dev = usb_dev;
1274         acm->ctrl_caps = ac_management_function;
1275         if (quirks & NO_CAP_LINE)
1276                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1277         acm->ctrlsize = ctrlsize;
1278         acm->readsize = readsize;
1279         acm->rx_buflimit = num_rx_buf;
1280         INIT_WORK(&acm->work, acm_softint);
1281         init_waitqueue_head(&acm->wioctl);
1282         spin_lock_init(&acm->write_lock);
1283         spin_lock_init(&acm->read_lock);
1284         mutex_init(&acm->mutex);
1285         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1286         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1287         if (acm->is_int_ep)
1288                 acm->bInterval = epread->bInterval;
1289         tty_port_init(&acm->port);
1290         acm->port.ops = &acm_port_ops;
1291         init_usb_anchor(&acm->delayed);
1292
1293         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1294         if (!buf) {
1295                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1296                 goto alloc_fail2;
1297         }
1298         acm->ctrl_buffer = buf;
1299
1300         if (acm_write_buffers_alloc(acm) < 0) {
1301                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1302                 goto alloc_fail4;
1303         }
1304
1305         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1306         if (!acm->ctrlurb) {
1307                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1308                 goto alloc_fail5;
1309         }
1310         for (i = 0; i < num_rx_buf; i++) {
1311                 struct acm_rb *rb = &(acm->read_buffers[i]);
1312                 struct urb *urb;
1313
1314                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1315                                                                 &rb->dma);
1316                 if (!rb->base) {
1317                         dev_err(&intf->dev, "out of memory "
1318                                         "(read bufs usb_alloc_coherent)\n");
1319                         goto alloc_fail6;
1320                 }
1321                 rb->index = i;
1322                 rb->instance = acm;
1323
1324                 urb = usb_alloc_urb(0, GFP_KERNEL);
1325                 if (!urb) {
1326                         dev_err(&intf->dev,
1327                                 "out of memory (read urbs usb_alloc_urb)\n");
1328                         goto alloc_fail6;
1329                 }
1330                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1331                 urb->transfer_dma = rb->dma;
1332                 if (acm->is_int_ep) {
1333                         usb_fill_int_urb(urb, acm->dev,
1334                                          acm->rx_endpoint,
1335                                          rb->base,
1336                                          acm->readsize,
1337                                          acm_read_bulk_callback, rb,
1338                                          acm->bInterval);
1339                 } else {
1340                         usb_fill_bulk_urb(urb, acm->dev,
1341                                           acm->rx_endpoint,
1342                                           rb->base,
1343                                           acm->readsize,
1344                                           acm_read_bulk_callback, rb);
1345                 }
1346
1347                 acm->read_urbs[i] = urb;
1348                 __set_bit(i, &acm->read_urbs_free);
1349         }
1350         for (i = 0; i < ACM_NW; i++) {
1351                 struct acm_wb *snd = &(acm->wb[i]);
1352
1353                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1354                 if (snd->urb == NULL) {
1355                         dev_err(&intf->dev,
1356                                 "out of memory (write urbs usb_alloc_urb)\n");
1357                         goto alloc_fail7;
1358                 }
1359
1360                 if (usb_endpoint_xfer_int(epwrite))
1361                         usb_fill_int_urb(snd->urb, usb_dev,
1362                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1363                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1364                 else
1365                         usb_fill_bulk_urb(snd->urb, usb_dev,
1366                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1367                                 NULL, acm->writesize, acm_write_bulk, snd);
1368                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1369                 snd->instance = acm;
1370         }
1371
1372         usb_set_intfdata(intf, acm);
1373
1374         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1375         if (i < 0)
1376                 goto alloc_fail7;
1377
1378         if (cfd) { /* export the country data */
1379                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1380                 if (!acm->country_codes)
1381                         goto skip_countries;
1382                 acm->country_code_size = cfd->bLength - 4;
1383                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1384                                                         cfd->bLength - 4);
1385                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1386
1387                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1388                 if (i < 0) {
1389                         kfree(acm->country_codes);
1390                         acm->country_codes = NULL;
1391                         acm->country_code_size = 0;
1392                         goto skip_countries;
1393                 }
1394
1395                 i = device_create_file(&intf->dev,
1396                                                 &dev_attr_iCountryCodeRelDate);
1397                 if (i < 0) {
1398                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1399                         kfree(acm->country_codes);
1400                         acm->country_codes = NULL;
1401                         acm->country_code_size = 0;
1402                         goto skip_countries;
1403                 }
1404         }
1405
1406 skip_countries:
1407         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1408                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1409                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1410                          /* works around buggy devices */
1411                          epctrl->bInterval ? epctrl->bInterval : 16);
1412         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1413         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1414
1415         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1416
1417         acm_set_control(acm, acm->ctrlout);
1418
1419         acm->line.dwDTERate = cpu_to_le32(9600);
1420         acm->line.bDataBits = 8;
1421         acm_set_line(acm, &acm->line);
1422
1423         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1424         usb_set_intfdata(data_interface, acm);
1425
1426         usb_get_intf(control_interface);
1427         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1428                         &control_interface->dev);
1429         if (IS_ERR(tty_dev)) {
1430                 rv = PTR_ERR(tty_dev);
1431                 goto alloc_fail8;
1432         }
1433
1434         return 0;
1435 alloc_fail8:
1436         if (acm->country_codes) {
1437                 device_remove_file(&acm->control->dev,
1438                                 &dev_attr_wCountryCodes);
1439                 device_remove_file(&acm->control->dev,
1440                                 &dev_attr_iCountryCodeRelDate);
1441         }
1442         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1443 alloc_fail7:
1444         usb_set_intfdata(intf, NULL);
1445         for (i = 0; i < ACM_NW; i++)
1446                 usb_free_urb(acm->wb[i].urb);
1447 alloc_fail6:
1448         for (i = 0; i < num_rx_buf; i++)
1449                 usb_free_urb(acm->read_urbs[i]);
1450         acm_read_buffers_free(acm);
1451         usb_free_urb(acm->ctrlurb);
1452 alloc_fail5:
1453         acm_write_buffers_free(acm);
1454 alloc_fail4:
1455         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1456 alloc_fail2:
1457         acm_release_minor(acm);
1458         kfree(acm);
1459 alloc_fail:
1460         return rv;
1461 }
1462
1463 static void stop_data_traffic(struct acm *acm)
1464 {
1465         int i;
1466
1467         dev_dbg(&acm->control->dev, "%s\n", __func__);
1468
1469         usb_kill_urb(acm->ctrlurb);
1470         for (i = 0; i < ACM_NW; i++)
1471                 usb_kill_urb(acm->wb[i].urb);
1472         for (i = 0; i < acm->rx_buflimit; i++)
1473                 usb_kill_urb(acm->read_urbs[i]);
1474
1475         cancel_work_sync(&acm->work);
1476 }
1477
1478 static void acm_disconnect(struct usb_interface *intf)
1479 {
1480         struct acm *acm = usb_get_intfdata(intf);
1481         struct usb_device *usb_dev = interface_to_usbdev(intf);
1482         struct tty_struct *tty;
1483         int i;
1484
1485         dev_dbg(&intf->dev, "%s\n", __func__);
1486
1487         /* sibling interface is already cleaning up */
1488         if (!acm)
1489                 return;
1490
1491         mutex_lock(&acm->mutex);
1492         acm->disconnected = true;
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         }
1499         wake_up_all(&acm->wioctl);
1500         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1501         usb_set_intfdata(acm->control, NULL);
1502         usb_set_intfdata(acm->data, NULL);
1503         mutex_unlock(&acm->mutex);
1504
1505         tty = tty_port_tty_get(&acm->port);
1506         if (tty) {
1507                 tty_vhangup(tty);
1508                 tty_kref_put(tty);
1509         }
1510
1511         stop_data_traffic(acm);
1512
1513         tty_unregister_device(acm_tty_driver, acm->minor);
1514
1515         usb_free_urb(acm->ctrlurb);
1516         for (i = 0; i < ACM_NW; i++)
1517                 usb_free_urb(acm->wb[i].urb);
1518         for (i = 0; i < acm->rx_buflimit; i++)
1519                 usb_free_urb(acm->read_urbs[i]);
1520         acm_write_buffers_free(acm);
1521         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1522         acm_read_buffers_free(acm);
1523
1524         if (!acm->combined_interfaces)
1525                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1526                                         acm->data : acm->control);
1527
1528         tty_port_put(&acm->port);
1529 }
1530
1531 #ifdef CONFIG_PM
1532 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1533 {
1534         struct acm *acm = usb_get_intfdata(intf);
1535         int cnt;
1536
1537         spin_lock_irq(&acm->read_lock);
1538         spin_lock(&acm->write_lock);
1539         if (PMSG_IS_AUTO(message)) {
1540                 if (acm->transmitting) {
1541                         spin_unlock(&acm->write_lock);
1542                         spin_unlock_irq(&acm->read_lock);
1543                         return -EBUSY;
1544                 }
1545         }
1546         cnt = acm->susp_count++;
1547         spin_unlock(&acm->write_lock);
1548         spin_unlock_irq(&acm->read_lock);
1549
1550         if (cnt)
1551                 return 0;
1552
1553         stop_data_traffic(acm);
1554
1555         return 0;
1556 }
1557
1558 static int acm_resume(struct usb_interface *intf)
1559 {
1560         struct acm *acm = usb_get_intfdata(intf);
1561         struct urb *urb;
1562         int rv = 0;
1563
1564         spin_lock_irq(&acm->read_lock);
1565         spin_lock(&acm->write_lock);
1566
1567         if (--acm->susp_count)
1568                 goto out;
1569
1570         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1571                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1572
1573                 for (;;) {
1574                         urb = usb_get_from_anchor(&acm->delayed);
1575                         if (!urb)
1576                                 break;
1577
1578                         acm_start_wb(acm, urb->context);
1579                 }
1580
1581                 /*
1582                  * delayed error checking because we must
1583                  * do the write path at all cost
1584                  */
1585                 if (rv < 0)
1586                         goto out;
1587
1588                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1589         }
1590 out:
1591         spin_unlock(&acm->write_lock);
1592         spin_unlock_irq(&acm->read_lock);
1593
1594         return rv;
1595 }
1596
1597 static int acm_reset_resume(struct usb_interface *intf)
1598 {
1599         struct acm *acm = usb_get_intfdata(intf);
1600
1601         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1602                 tty_port_tty_hangup(&acm->port, false);
1603
1604         return acm_resume(intf);
1605 }
1606
1607 #endif /* CONFIG_PM */
1608
1609 #define NOKIA_PCSUITE_ACM_INFO(x) \
1610                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1611                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1612                 USB_CDC_ACM_PROTO_VENDOR)
1613
1614 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1615                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1616                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1617                 USB_CDC_ACM_PROTO_VENDOR)
1618
1619 /*
1620  * USB driver structure.
1621  */
1622
1623 static const struct usb_device_id acm_ids[] = {
1624         /* quirky and broken devices */
1625         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1626         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1627         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1628         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1629         },
1630         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1631         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1632         },
1633         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1634         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1635         },
1636         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1637         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1638         },
1639         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1640         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1641         },
1642         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1643         .driver_info = SINGLE_RX_URB,
1644         },
1645         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1646         .driver_info = SINGLE_RX_URB, /* firmware bug */
1647         },
1648         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1649         .driver_info = SINGLE_RX_URB, /* firmware bug */
1650         },
1651         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1652         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1653         },
1654         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1655         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1656         },
1657         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1658         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1659         },
1660         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1661         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1662         },
1663         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1664         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1665         },
1666         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1667         },
1668         /* Motorola H24 HSPA module: */
1669         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1670         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1671         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1672         },
1673         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1674         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1675         },
1676         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1677         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1678         },
1679         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1680         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1681         },
1682         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1683         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1684         },
1685         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1686         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1687         },
1688         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1689         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1690         },
1691
1692         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1693         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1694                                            data interface instead of
1695                                            communications interface.
1696                                            Maybe we should define a new
1697                                            quirk for this. */
1698         },
1699         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1700         .driver_info = NO_UNION_NORMAL,
1701         },
1702         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1703         .driver_info = NO_UNION_NORMAL,
1704         },
1705         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1706         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1707         },
1708         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1709         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1710         },
1711
1712         /* Nokia S60 phones expose two ACM channels. The first is
1713          * a modem and is picked up by the standard AT-command
1714          * information below. The second is 'vendor-specific' but
1715          * is treated as a serial device at the S60 end, so we want
1716          * to expose it on Linux too. */
1717         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1718         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1719         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1720         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1721         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1722         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1723         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1724         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1725         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1726         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1727         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1728         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1729         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1730         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1731         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1732         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1733         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1734         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1735         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1736         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1737         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1738         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1739         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1740         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1741         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1742         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1743         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1744         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1745         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1746         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1747         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1748         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1749         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1750         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1751         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1752         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1753         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1754         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1755         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1756         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1757         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1758         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1759         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1760         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1761         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1762         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1763         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1764         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1765         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1766         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1767         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1768         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1769         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1770         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1771         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1772         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1773         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1774         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1775
1776         /* Support for Owen devices */
1777         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1778
1779         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1780
1781         /* Support Lego NXT using pbLua firmware */
1782         { USB_DEVICE(0x0694, 0xff00),
1783         .driver_info = NOT_A_MODEM,
1784         },
1785
1786         /* Support for Droids MuIn LCD */
1787         { USB_DEVICE(0x04d8, 0x000b),
1788         .driver_info = NO_DATA_INTERFACE,
1789         },
1790
1791 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1792         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1793         .driver_info = IGNORE_DEVICE,
1794         },
1795         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1796         .driver_info = IGNORE_DEVICE,
1797         },
1798 #endif
1799
1800         /* control interfaces without any protocol set */
1801         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1802                 USB_CDC_PROTO_NONE) },
1803
1804         /* control interfaces with various AT-command sets */
1805         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1806                 USB_CDC_ACM_PROTO_AT_V25TER) },
1807         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1808                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1809         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1810                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1811         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1812                 USB_CDC_ACM_PROTO_AT_GSM) },
1813         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1814                 USB_CDC_ACM_PROTO_AT_3G) },
1815         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1816                 USB_CDC_ACM_PROTO_AT_CDMA) },
1817
1818         { }
1819 };
1820
1821 MODULE_DEVICE_TABLE(usb, acm_ids);
1822
1823 static struct usb_driver acm_driver = {
1824         .name =         "cdc_acm",
1825         .probe =        acm_probe,
1826         .disconnect =   acm_disconnect,
1827 #ifdef CONFIG_PM
1828         .suspend =      acm_suspend,
1829         .resume =       acm_resume,
1830         .reset_resume = acm_reset_resume,
1831 #endif
1832         .id_table =     acm_ids,
1833 #ifdef CONFIG_PM
1834         .supports_autosuspend = 1,
1835 #endif
1836         .disable_hub_initiated_lpm = 1,
1837 };
1838
1839 /*
1840  * TTY driver structures.
1841  */
1842
1843 static const struct tty_operations acm_ops = {
1844         .install =              acm_tty_install,
1845         .open =                 acm_tty_open,
1846         .close =                acm_tty_close,
1847         .cleanup =              acm_tty_cleanup,
1848         .hangup =               acm_tty_hangup,
1849         .write =                acm_tty_write,
1850         .write_room =           acm_tty_write_room,
1851         .ioctl =                acm_tty_ioctl,
1852         .throttle =             acm_tty_throttle,
1853         .unthrottle =           acm_tty_unthrottle,
1854         .chars_in_buffer =      acm_tty_chars_in_buffer,
1855         .break_ctl =            acm_tty_break_ctl,
1856         .set_termios =          acm_tty_set_termios,
1857         .tiocmget =             acm_tty_tiocmget,
1858         .tiocmset =             acm_tty_tiocmset,
1859 };
1860
1861 /*
1862  * Init / exit.
1863  */
1864
1865 static int __init acm_init(void)
1866 {
1867         int retval;
1868         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1869         if (!acm_tty_driver)
1870                 return -ENOMEM;
1871         acm_tty_driver->driver_name = "acm",
1872         acm_tty_driver->name = "ttyACM",
1873         acm_tty_driver->major = ACM_TTY_MAJOR,
1874         acm_tty_driver->minor_start = 0,
1875         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1876         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1877         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1878         acm_tty_driver->init_termios = tty_std_termios;
1879         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1880                                                                 HUPCL | CLOCAL;
1881         tty_set_operations(acm_tty_driver, &acm_ops);
1882
1883         retval = tty_register_driver(acm_tty_driver);
1884         if (retval) {
1885                 put_tty_driver(acm_tty_driver);
1886                 return retval;
1887         }
1888
1889         retval = usb_register(&acm_driver);
1890         if (retval) {
1891                 tty_unregister_driver(acm_tty_driver);
1892                 put_tty_driver(acm_tty_driver);
1893                 return retval;
1894         }
1895
1896         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1897
1898         return 0;
1899 }
1900
1901 static void __exit acm_exit(void)
1902 {
1903         usb_deregister(&acm_driver);
1904         tty_unregister_driver(acm_tty_driver);
1905         put_tty_driver(acm_tty_driver);
1906 }
1907
1908 module_init(acm_init);
1909 module_exit(acm_exit);
1910
1911 MODULE_AUTHOR(DRIVER_AUTHOR);
1912 MODULE_DESCRIPTION(DRIVER_DESC);
1913 MODULE_LICENSE("GPL");
1914 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);