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         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 529         if (retval) {
 530                 dev_err(&acm->control->dev,
 531                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 532                 goto error_submit_urb;
 533         }
 534
 535         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
 536         retval = acm_set_control(acm, acm->ctrlout);
 537         if (retval < 0 && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 538                 goto error_set_control;
 539
 540         /*
 541          * Unthrottle device in case the TTY was closed while throttled.
 542          */
 543         spin_lock_irq(&acm->read_lock);
 544         acm->throttled = 0;
 545         acm->throttle_req = 0;
 546         spin_unlock_irq(&acm->read_lock);
 547
 548         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 549         if (retval)
 550                 goto error_submit_read_urbs;
 551
 552         usb_autopm_put_interface(acm->control);
 553
 554         mutex_unlock(&acm->mutex);
 555
 556         return 0;
 557
 558 error_submit_read_urbs:
 559         acm->ctrlout = 0;
 560         acm_set_control(acm, acm->ctrlout);
 561 error_set_control:
 562         usb_kill_urb(acm->ctrlurb);
 563 error_submit_urb:
 564         usb_autopm_put_interface(acm->control);
 565 error_get_interface:
 566 disconnected:
 567         mutex_unlock(&acm->mutex);
 568
 569         return usb_translate_errors(retval);
 570 }
 571
 572 static void acm_port_destruct(struct tty_port *port)
 573 {
 574         struct acm *acm = container_of(port, struct acm, port);
 575
 576         dev_dbg(&acm->control->dev, "%s\n", __func__);
 577
 578         acm_release_minor(acm);
 579         usb_put_intf(acm->control);
 580         kfree(acm->country_codes);
 581         kfree(acm);
 582 }
 583
 584 static void acm_port_shutdown(struct tty_port *port)
 585 {
 586         struct acm *acm = container_of(port, struct acm, port);
 587         struct urb *urb;
 588         struct acm_wb *wb;
 589         int i;
 590
 591         dev_dbg(&acm->control->dev, "%s\n", __func__);
 592
 593         mutex_lock(&acm->mutex);
 594         if (!acm->disconnected) {
 595                 usb_autopm_get_interface(acm->control);
 596                 acm_set_control(acm, acm->ctrlout = 0);
 597
 598                 for (;;) {
 599                         urb = usb_get_from_anchor(&acm->delayed);
 600                         if (!urb)
 601                                 break;
 602                         wb = urb->context;
 603                         wb->use = 0;
 604                         usb_autopm_put_interface_async(acm->control);
 605                 }
 606
 607                 usb_kill_urb(acm->ctrlurb);
 608                 for (i = 0; i < ACM_NW; i++)
 609                         usb_kill_urb(acm->wb[i].urb);
 610                 for (i = 0; i < acm->rx_buflimit; i++)
 611                         usb_kill_urb(acm->read_urbs[i]);
 612                 acm->control->needs_remote_wakeup = 0;
 613                 usb_autopm_put_interface(acm->control);
 614         }
 615         mutex_unlock(&acm->mutex);
 616 }
 617
 618 static void acm_tty_cleanup(struct tty_struct *tty)
 619 {
 620         struct acm *acm = tty->driver_data;
 621         dev_dbg(&acm->control->dev, "%s\n", __func__);
 622         tty_port_put(&acm->port);
 623 }
 624
 625 static void acm_tty_hangup(struct tty_struct *tty)
 626 {
 627         struct acm *acm = tty->driver_data;
 628         dev_dbg(&acm->control->dev, "%s\n", __func__);
 629         tty_port_hangup(&acm->port);
 630 }
 631
 632 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 633 {
 634         struct acm *acm = tty->driver_data;
 635         dev_dbg(&acm->control->dev, "%s\n", __func__);
 636         tty_port_close(&acm->port, tty, filp);
 637 }
 638
 639 static int acm_tty_write(struct tty_struct *tty,
 640                                         const unsigned char *buf, int count)
 641 {
 642         struct acm *acm = tty->driver_data;
 643         int stat;
 644         unsigned long flags;
 645         int wbn;
 646         struct acm_wb *wb;
 647
 648         if (!count)
 649                 return 0;
 650
 651         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 652
 653         spin_lock_irqsave(&acm->write_lock, flags);
 654         wbn = acm_wb_alloc(acm);
 655         if (wbn < 0) {
 656                 spin_unlock_irqrestore(&acm->write_lock, flags);
 657                 return 0;
 658         }
 659         wb = &acm->wb[wbn];
 660
 661         if (!acm->dev) {
 662                 wb->use = 0;
 663                 spin_unlock_irqrestore(&acm->write_lock, flags);
 664                 return -ENODEV;
 665         }
 666
 667         count = (count > acm->writesize) ? acm->writesize : count;
 668         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 669         memcpy(wb->buf, buf, count);
 670         wb->len = count;
 671
 672         stat = usb_autopm_get_interface_async(acm->control);
 673         if (stat) {
 674                 wb->use = 0;
 675                 spin_unlock_irqrestore(&acm->write_lock, flags);
 676                 return stat;
 677         }
 678
 679         if (acm->susp_count) {
 680                 usb_anchor_urb(wb->urb, &acm->delayed);
 681                 spin_unlock_irqrestore(&acm->write_lock, flags);
 682                 return count;
 683         }
 684         usb_mark_last_busy(acm->dev);
 685
 686         stat = acm_start_wb(acm, wb);
 687         spin_unlock_irqrestore(&acm->write_lock, flags);
 688
 689         if (stat < 0)
 690                 return stat;
 691         return count;
 692 }
 693
 694 static int acm_tty_write_room(struct tty_struct *tty)
 695 {
 696         struct acm *acm = tty->driver_data;
 697         /*
 698          * Do not let the line discipline to know that we have a reserve,
 699          * or it might get too enthusiastic.
 700          */
 701         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 702 }
 703
 704 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 705 {
 706         struct acm *acm = tty->driver_data;
 707         /*
 708          * if the device was unplugged then any remaining characters fell out
 709          * of the connector ;)
 710          */
 711         if (acm->disconnected)
 712                 return 0;
 713         /*
 714          * This is inaccurate (overcounts), but it works.
 715          */
 716         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 717 }
 718
 719 static void acm_tty_throttle(struct tty_struct *tty)
 720 {
 721         struct acm *acm = tty->driver_data;
 722
 723         spin_lock_irq(&acm->read_lock);
 724         acm->throttle_req = 1;
 725         spin_unlock_irq(&acm->read_lock);
 726 }
 727
 728 static void acm_tty_unthrottle(struct tty_struct *tty)
 729 {
 730         struct acm *acm = tty->driver_data;
 731         unsigned int was_throttled;
 732
 733         spin_lock_irq(&acm->read_lock);
 734         was_throttled = acm->throttled;
 735         acm->throttled = 0;
 736         acm->throttle_req = 0;
 737         spin_unlock_irq(&acm->read_lock);
 738
 739         if (was_throttled)
 740                 acm_submit_read_urbs(acm, GFP_KERNEL);
 741 }
 742
 743 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 744 {
 745         struct acm *acm = tty->driver_data;
 746         int retval;
 747
 748         retval = acm_send_break(acm, state ? 0xffff : 0);
 749         if (retval < 0)
 750                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 751                                                                 __func__);
 752         return retval;
 753 }
 754
 755 static int acm_tty_tiocmget(struct tty_struct *tty)
 756 {
 757         struct acm *acm = tty->driver_data;
 758
 759         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 760                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 761                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 762                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 763                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 764                TIOCM_CTS;
 765 }
 766
 767 static int acm_tty_tiocmset(struct tty_struct *tty,
 768                             unsigned int set, unsigned int clear)
 769 {
 770         struct acm *acm = tty->driver_data;
 771         unsigned int newctrl;
 772
 773         newctrl = acm->ctrlout;
 774         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 775                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 776         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 777                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 778
 779         newctrl = (newctrl & ~clear) | set;
 780
 781         if (acm->ctrlout == newctrl)
 782                 return 0;
 783         return acm_set_control(acm, acm->ctrlout = newctrl);
 784 }
 785
 786 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 787 {
 788         struct serial_struct tmp;
 789
 790         if (!info)
 791                 return -EINVAL;
 792
 793         memset(&tmp, 0, sizeof(tmp));
 794         tmp.flags = ASYNC_LOW_LATENCY;
 795         tmp.xmit_fifo_size = acm->writesize;
 796         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 797         tmp.close_delay = acm->port.close_delay / 10;
 798         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 799                                 ASYNC_CLOSING_WAIT_NONE :
 800                                 acm->port.closing_wait / 10;
 801
 802         if (copy_to_user(info, &tmp, sizeof(tmp)))
 803                 return -EFAULT;
 804         else
 805                 return 0;
 806 }
 807
 808 static int set_serial_info(struct acm *acm,
 809                                 struct serial_struct __user *newinfo)
 810 {
 811         struct serial_struct new_serial;
 812         unsigned int closing_wait, close_delay;
 813         int retval = 0;
 814
 815         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 816                 return -EFAULT;
 817
 818         close_delay = new_serial.close_delay * 10;
 819         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 820                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 821
 822         mutex_lock(&acm->port.mutex);
 823
 824         if (!capable(CAP_SYS_ADMIN)) {
 825                 if ((close_delay != acm->port.close_delay) ||
 826                     (closing_wait != acm->port.closing_wait))
 827                         retval = -EPERM;
 828                 else
 829                         retval = -EOPNOTSUPP;
 830         } else {
 831                 acm->port.close_delay  = close_delay;
 832                 acm->port.closing_wait = closing_wait;
 833         }
 834
 835         mutex_unlock(&acm->port.mutex);
 836         return retval;
 837 }
 838
 839 static int wait_serial_change(struct acm *acm, unsigned long arg)
 840 {
 841         int rv = 0;
 842         DECLARE_WAITQUEUE(wait, current);
 843         struct async_icount old, new;
 844
 845         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
 846                 return -EINVAL;
 847         do {
 848                 spin_lock_irq(&acm->read_lock);
 849                 old = acm->oldcount;
 850                 new = acm->iocount;
 851                 acm->oldcount = new;
 852                 spin_unlock_irq(&acm->read_lock);
 853
 854                 if ((arg & TIOCM_DSR) &&
 855                         old.dsr != new.dsr)
 856                         break;
 857                 if ((arg & TIOCM_CD)  &&
 858                         old.dcd != new.dcd)
 859                         break;
 860                 if ((arg & TIOCM_RI) &&
 861                         old.rng != new.rng)
 862                         break;
 863
 864                 add_wait_queue(&acm->wioctl, &wait);
 865                 set_current_state(TASK_INTERRUPTIBLE);
 866                 schedule();
 867                 remove_wait_queue(&acm->wioctl, &wait);
 868                 if (acm->disconnected) {
 869                         if (arg & TIOCM_CD)
 870                                 break;
 871                         else
 872                                 rv = -ENODEV;
 873                 } else {
 874                         if (signal_pending(current))
 875                                 rv = -ERESTARTSYS;
 876                 }
 877         } while (!rv);
 878
 879
 880
 881         return rv;
 882 }
 883
 884 static int get_serial_usage(struct acm *acm,
 885                             struct serial_icounter_struct __user *count)
 886 {
 887         struct serial_icounter_struct icount;
 888         int rv = 0;
 889
 890         memset(&icount, 0, sizeof(icount));
 891         icount.dsr = acm->iocount.dsr;
 892         icount.rng = acm->iocount.rng;
 893         icount.dcd = acm->iocount.dcd;
 894         icount.frame = acm->iocount.frame;
 895         icount.overrun = acm->iocount.overrun;
 896         icount.parity = acm->iocount.parity;
 897         icount.brk = acm->iocount.brk;
 898
 899         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 900                 rv = -EFAULT;
 901
 902         return rv;
 903 }
 904
 905 static int acm_tty_ioctl(struct tty_struct *tty,
 906                                         unsigned int cmd, unsigned long arg)
 907 {
 908         struct acm *acm = tty->driver_data;
 909         int rv = -ENOIOCTLCMD;
 910
 911         switch (cmd) {
 912         case TIOCGSERIAL: /* gets serial port data */
 913                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 914                 break;
 915         case TIOCSSERIAL:
 916                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 917                 break;
 918         case TIOCMIWAIT:
 919                 rv = usb_autopm_get_interface(acm->control);
 920                 if (rv < 0) {
 921                         rv = -EIO;
 922                         break;
 923                 }
 924                 rv = wait_serial_change(acm, arg);
 925                 usb_autopm_put_interface(acm->control);
 926                 break;
 927         case TIOCGICOUNT:
 928                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
 929                 break;
 930         }
 931
 932         return rv;
 933 }
 934
 935 static void acm_tty_set_termios(struct tty_struct *tty,
 936                                                 struct ktermios *termios_old)
 937 {
 938         struct acm *acm = tty->driver_data;
 939         struct ktermios *termios = &tty->termios;
 940         struct usb_cdc_line_coding newline;
 941         int newctrl = acm->ctrlout;
 942
 943         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 944         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 945         newline.bParityType = termios->c_cflag & PARENB ?
 946                                 (termios->c_cflag & PARODD ? 1 : 2) +
 947                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 948         switch (termios->c_cflag & CSIZE) {
 949         case CS5:
 950                 newline.bDataBits = 5;
 951                 break;
 952         case CS6:
 953                 newline.bDataBits = 6;
 954                 break;
 955         case CS7:
 956                 newline.bDataBits = 7;
 957                 break;
 958         case CS8:
 959         default:
 960                 newline.bDataBits = 8;
 961                 break;
 962         }
 963         /* FIXME: Needs to clear unsupported bits in the termios */
 964         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 965
 966         if (!newline.dwDTERate) {
 967                 newline.dwDTERate = acm->line.dwDTERate;
 968                 newctrl &= ~ACM_CTRL_DTR;
 969         } else
 970                 newctrl |=  ACM_CTRL_DTR;
 971
 972         if (newctrl != acm->ctrlout)
 973                 acm_set_control(acm, acm->ctrlout = newctrl);
 974
 975         if (memcmp(&acm->line, &newline, sizeof newline)) {
 976                 memcpy(&acm->line, &newline, sizeof newline);
 977                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 978                         __func__,
 979                         le32_to_cpu(newline.dwDTERate),
 980                         newline.bCharFormat, newline.bParityType,
 981                         newline.bDataBits);
 982                 acm_set_line(acm, &acm->line);
 983         }
 984 }
 985
 986 static const struct tty_port_operations acm_port_ops = {
 987         .shutdown = acm_port_shutdown,
 988         .activate = acm_port_activate,
 989         .destruct = acm_port_destruct,
 990 };
 991
 992 /*
 993  * USB probe and disconnect routines.
 994  */
 995
 996 /* Little helpers: write/read buffers free */
 997 static void acm_write_buffers_free(struct acm *acm)
 998 {
 999         int i;
1000         struct acm_wb *wb;
1001         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1002
1003         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1004                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1005 }
1006
1007 static void acm_read_buffers_free(struct acm *acm)
1008 {
1009         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1010         int i;
1011
1012         for (i = 0; i < acm->rx_buflimit; i++)
1013                 usb_free_coherent(usb_dev, acm->readsize,
1014                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1015 }
1016
1017 /* Little helper: write buffers allocate */
1018 static int acm_write_buffers_alloc(struct acm *acm)
1019 {
1020         int i;
1021         struct acm_wb *wb;
1022
1023         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1024                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1025                     &wb->dmah);
1026                 if (!wb->buf) {
1027                         while (i != 0) {
1028                                 --i;
1029                                 --wb;
1030                                 usb_free_coherent(acm->dev, acm->writesize,
1031                                     wb->buf, wb->dmah);
1032                         }
1033                         return -ENOMEM;
1034                 }
1035         }
1036         return 0;
1037 }
1038
1039 static int acm_probe(struct usb_interface *intf,
1040                      const struct usb_device_id *id)
1041 {
1042         struct usb_cdc_union_desc *union_header = NULL;
1043         struct usb_cdc_country_functional_desc *cfd = NULL;
1044         unsigned char *buffer = intf->altsetting->extra;
1045         int buflen = intf->altsetting->extralen;
1046         struct usb_interface *control_interface;
1047         struct usb_interface *data_interface;
1048         struct usb_endpoint_descriptor *epctrl = NULL;
1049         struct usb_endpoint_descriptor *epread = NULL;
1050         struct usb_endpoint_descriptor *epwrite = NULL;
1051         struct usb_device *usb_dev = interface_to_usbdev(intf);
1052         struct acm *acm;
1053         int minor;
1054         int ctrlsize, readsize;
1055         u8 *buf;
1056         u8 ac_management_function = 0;
1057         u8 call_management_function = 0;
1058         int call_interface_num = -1;
1059         int data_interface_num = -1;
1060         unsigned long quirks;
1061         int num_rx_buf;
1062         int i;
1063         int combined_interfaces = 0;
1064         struct device *tty_dev;
1065         int rv = -ENOMEM;
1066
1067         /* normal quirks */
1068         quirks = (unsigned long)id->driver_info;
1069
1070         if (quirks == IGNORE_DEVICE)
1071                 return -ENODEV;
1072
1073         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1074
1075         /* handle quirks deadly to normal probing*/
1076         if (quirks == NO_UNION_NORMAL) {
1077                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1078                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1079                 goto skip_normal_probe;
1080         }
1081
1082         /* normal probing*/
1083         if (!buffer) {
1084                 dev_err(&intf->dev, "Weird descriptor references\n");
1085                 return -EINVAL;
1086         }
1087
1088         if (!buflen) {
1089                 if (intf->cur_altsetting->endpoint &&
1090                                 intf->cur_altsetting->endpoint->extralen &&
1091                                 intf->cur_altsetting->endpoint->extra) {
1092                         dev_dbg(&intf->dev,
1093                                 "Seeking extra descriptors on endpoint\n");
1094                         buflen = intf->cur_altsetting->endpoint->extralen;
1095                         buffer = intf->cur_altsetting->endpoint->extra;
1096                 } else {
1097                         dev_err(&intf->dev,
1098                                 "Zero length descriptor references\n");
1099                         return -EINVAL;
1100                 }
1101         }
1102
1103         while (buflen > 0) {
1104                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1105                         dev_err(&intf->dev, "skipping garbage\n");
1106                         goto next_desc;
1107                 }
1108
1109                 switch (buffer[2]) {
1110                 case USB_CDC_UNION_TYPE: /* we've found it */
1111                         if (union_header) {
1112                                 dev_err(&intf->dev, "More than one "
1113                                         "union descriptor, skipping ...\n");
1114                                 goto next_desc;
1115                         }
1116                         union_header = (struct usb_cdc_union_desc *)buffer;
1117                         break;
1118                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1119                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1120                         break;
1121                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1122                         break; /* for now we ignore it */
1123                 case USB_CDC_ACM_TYPE:
1124                         ac_management_function = buffer[3];
1125                         break;
1126                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1127                         call_management_function = buffer[3];
1128                         call_interface_num = buffer[4];
1129                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1130                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1131                         break;
1132                 default:
1133                         /* there are LOTS more CDC descriptors that
1134                          * could legitimately be found here.
1135                          */
1136                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1137                                         "type %02x, length %d\n",
1138                                         buffer[2], buffer[0]);
1139                         break;
1140                 }
1141 next_desc:
1142                 buflen -= buffer[0];
1143                 buffer += buffer[0];
1144         }
1145
1146         if (!union_header) {
1147                 if (call_interface_num > 0) {
1148                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1149                         /* quirks for Droids MuIn LCD */
1150                         if (quirks & NO_DATA_INTERFACE)
1151                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1152                         else
1153                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1154                         control_interface = intf;
1155                 } else {
1156                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1157                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1158                                 return -ENODEV;
1159                         } else {
1160                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1161                                 combined_interfaces = 1;
1162                                 control_interface = data_interface = intf;
1163                                 goto look_for_collapsed_interface;
1164                         }
1165                 }
1166         } else {
1167                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1168                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1169                 if (!control_interface || !data_interface) {
1170                         dev_dbg(&intf->dev, "no interfaces\n");
1171                         return -ENODEV;
1172                 }
1173         }
1174
1175         if (data_interface_num != call_interface_num)
1176                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1177
1178         if (control_interface == data_interface) {
1179                 /* some broken devices designed for windows work this way */
1180                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1181                 combined_interfaces = 1;
1182                 /* a popular other OS doesn't use it */
1183                 quirks |= NO_CAP_LINE;
1184                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1185                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1186                         return -EINVAL;
1187                 }
1188 look_for_collapsed_interface:
1189                 for (i = 0; i < 3; i++) {
1190                         struct usb_endpoint_descriptor *ep;
1191                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1192
1193                         if (usb_endpoint_is_int_in(ep))
1194                                 epctrl = ep;
1195                         else if (usb_endpoint_is_bulk_out(ep))
1196                                 epwrite = ep;
1197                         else if (usb_endpoint_is_bulk_in(ep))
1198                                 epread = ep;
1199                         else
1200                                 return -EINVAL;
1201                 }
1202                 if (!epctrl || !epread || !epwrite)
1203                         return -ENODEV;
1204                 else
1205                         goto made_compressed_probe;
1206         }
1207
1208 skip_normal_probe:
1209
1210         /*workaround for switched interfaces */
1211         if (data_interface->cur_altsetting->desc.bInterfaceClass
1212                                                 != CDC_DATA_INTERFACE_TYPE) {
1213                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1214                                                 == CDC_DATA_INTERFACE_TYPE) {
1215                         struct usb_interface *t;
1216                         dev_dbg(&intf->dev,
1217                                 "Your device has switched interfaces.\n");
1218                         t = control_interface;
1219                         control_interface = data_interface;
1220                         data_interface = t;
1221                 } else {
1222                         return -EINVAL;
1223                 }
1224         }
1225
1226         /* Accept probe requests only for the control interface */
1227         if (!combined_interfaces && intf != control_interface)
1228                 return -ENODEV;
1229
1230         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1231                 /* valid in this context */
1232                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1233                 return -EBUSY;
1234         }
1235
1236
1237         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1238             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1239                 return -EINVAL;
1240
1241         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1242         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1243         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1244
1245
1246         /* workaround for switched endpoints */
1247         if (!usb_endpoint_dir_in(epread)) {
1248                 /* descriptors are swapped */
1249                 struct usb_endpoint_descriptor *t;
1250                 dev_dbg(&intf->dev,
1251                         "The data interface has switched endpoints\n");
1252                 t = epread;
1253                 epread = epwrite;
1254                 epwrite = t;
1255         }
1256 made_compressed_probe:
1257         dev_dbg(&intf->dev, "interfaces are valid\n");
1258
1259         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1260         if (acm == NULL) {
1261                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1262                 goto alloc_fail;
1263         }
1264
1265         minor = acm_alloc_minor(acm);
1266         if (minor == ACM_TTY_MINORS) {
1267                 dev_err(&intf->dev, "no more free acm devices\n");
1268                 kfree(acm);
1269                 return -ENODEV;
1270         }
1271
1272         ctrlsize = usb_endpoint_maxp(epctrl);
1273         readsize = usb_endpoint_maxp(epread) *
1274                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1275         acm->combined_interfaces = combined_interfaces;
1276         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1277         acm->control = control_interface;
1278         acm->data = data_interface;
1279         acm->minor = minor;
1280         acm->dev = usb_dev;
1281         acm->ctrl_caps = ac_management_function;
1282         if (quirks & NO_CAP_LINE)
1283                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1284         acm->ctrlsize = ctrlsize;
1285         acm->readsize = readsize;
1286         acm->rx_buflimit = num_rx_buf;
1287         INIT_WORK(&acm->work, acm_softint);
1288         init_waitqueue_head(&acm->wioctl);
1289         spin_lock_init(&acm->write_lock);
1290         spin_lock_init(&acm->read_lock);
1291         mutex_init(&acm->mutex);
1292         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1293         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1294         if (acm->is_int_ep)
1295                 acm->bInterval = epread->bInterval;
1296         tty_port_init(&acm->port);
1297         acm->port.ops = &acm_port_ops;
1298         init_usb_anchor(&acm->delayed);
1299
1300         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1301         if (!buf) {
1302                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1303                 goto alloc_fail2;
1304         }
1305         acm->ctrl_buffer = buf;
1306
1307         if (acm_write_buffers_alloc(acm) < 0) {
1308                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1309                 goto alloc_fail4;
1310         }
1311
1312         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1313         if (!acm->ctrlurb) {
1314                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1315                 goto alloc_fail5;
1316         }
1317         for (i = 0; i < num_rx_buf; i++) {
1318                 struct acm_rb *rb = &(acm->read_buffers[i]);
1319                 struct urb *urb;
1320
1321                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1322                                                                 &rb->dma);
1323                 if (!rb->base) {
1324                         dev_err(&intf->dev, "out of memory "
1325                                         "(read bufs usb_alloc_coherent)\n");
1326                         goto alloc_fail6;
1327                 }
1328                 rb->index = i;
1329                 rb->instance = acm;
1330
1331                 urb = usb_alloc_urb(0, GFP_KERNEL);
1332                 if (!urb) {
1333                         dev_err(&intf->dev,
1334                                 "out of memory (read urbs usb_alloc_urb)\n");
1335                         goto alloc_fail6;
1336                 }
1337                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1338                 urb->transfer_dma = rb->dma;
1339                 if (acm->is_int_ep) {
1340                         usb_fill_int_urb(urb, acm->dev,
1341                                          acm->rx_endpoint,
1342                                          rb->base,
1343                                          acm->readsize,
1344                                          acm_read_bulk_callback, rb,
1345                                          acm->bInterval);
1346                 } else {
1347                         usb_fill_bulk_urb(urb, acm->dev,
1348                                           acm->rx_endpoint,
1349                                           rb->base,
1350                                           acm->readsize,
1351                                           acm_read_bulk_callback, rb);
1352                 }
1353
1354                 acm->read_urbs[i] = urb;
1355                 __set_bit(i, &acm->read_urbs_free);
1356         }
1357         for (i = 0; i < ACM_NW; i++) {
1358                 struct acm_wb *snd = &(acm->wb[i]);
1359
1360                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1361                 if (snd->urb == NULL) {
1362                         dev_err(&intf->dev,
1363                                 "out of memory (write urbs usb_alloc_urb)\n");
1364                         goto alloc_fail7;
1365                 }
1366
1367                 if (usb_endpoint_xfer_int(epwrite))
1368                         usb_fill_int_urb(snd->urb, usb_dev,
1369                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1370                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1371                 else
1372                         usb_fill_bulk_urb(snd->urb, usb_dev,
1373                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1374                                 NULL, acm->writesize, acm_write_bulk, snd);
1375                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1376                 snd->instance = acm;
1377         }
1378
1379         usb_set_intfdata(intf, acm);
1380
1381         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1382         if (i < 0)
1383                 goto alloc_fail7;
1384
1385         if (cfd) { /* export the country data */
1386                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1387                 if (!acm->country_codes)
1388                         goto skip_countries;
1389                 acm->country_code_size = cfd->bLength - 4;
1390                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1391                                                         cfd->bLength - 4);
1392                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1393
1394                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1395                 if (i < 0) {
1396                         kfree(acm->country_codes);
1397                         acm->country_codes = NULL;
1398                         acm->country_code_size = 0;
1399                         goto skip_countries;
1400                 }
1401
1402                 i = device_create_file(&intf->dev,
1403                                                 &dev_attr_iCountryCodeRelDate);
1404                 if (i < 0) {
1405                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1406                         kfree(acm->country_codes);
1407                         acm->country_codes = NULL;
1408                         acm->country_code_size = 0;
1409                         goto skip_countries;
1410                 }
1411         }
1412
1413 skip_countries:
1414         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1415                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1416                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1417                          /* works around buggy devices */
1418                          epctrl->bInterval ? epctrl->bInterval : 16);
1419         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1420         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1421
1422         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1423
1424         acm_set_control(acm, acm->ctrlout);
1425
1426         acm->line.dwDTERate = cpu_to_le32(9600);
1427         acm->line.bDataBits = 8;
1428         acm_set_line(acm, &acm->line);
1429
1430         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1431         usb_set_intfdata(data_interface, acm);
1432
1433         usb_get_intf(control_interface);
1434         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1435                         &control_interface->dev);
1436         if (IS_ERR(tty_dev)) {
1437                 rv = PTR_ERR(tty_dev);
1438                 goto alloc_fail8;
1439         }
1440
1441         return 0;
1442 alloc_fail8:
1443         if (acm->country_codes) {
1444                 device_remove_file(&acm->control->dev,
1445                                 &dev_attr_wCountryCodes);
1446                 device_remove_file(&acm->control->dev,
1447                                 &dev_attr_iCountryCodeRelDate);
1448         }
1449         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1450 alloc_fail7:
1451         usb_set_intfdata(intf, NULL);
1452         for (i = 0; i < ACM_NW; i++)
1453                 usb_free_urb(acm->wb[i].urb);
1454 alloc_fail6:
1455         for (i = 0; i < num_rx_buf; i++)
1456                 usb_free_urb(acm->read_urbs[i]);
1457         acm_read_buffers_free(acm);
1458         usb_free_urb(acm->ctrlurb);
1459 alloc_fail5:
1460         acm_write_buffers_free(acm);
1461 alloc_fail4:
1462         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1463 alloc_fail2:
1464         acm_release_minor(acm);
1465         kfree(acm);
1466 alloc_fail:
1467         return rv;
1468 }
1469
1470 static void stop_data_traffic(struct acm *acm)
1471 {
1472         int i;
1473
1474         dev_dbg(&acm->control->dev, "%s\n", __func__);
1475
1476         usb_kill_urb(acm->ctrlurb);
1477         for (i = 0; i < ACM_NW; i++)
1478                 usb_kill_urb(acm->wb[i].urb);
1479         for (i = 0; i < acm->rx_buflimit; i++)
1480                 usb_kill_urb(acm->read_urbs[i]);
1481
1482         cancel_work_sync(&acm->work);
1483 }
1484
1485 static void acm_disconnect(struct usb_interface *intf)
1486 {
1487         struct acm *acm = usb_get_intfdata(intf);
1488         struct usb_device *usb_dev = interface_to_usbdev(intf);
1489         struct tty_struct *tty;
1490         int i;
1491
1492         dev_dbg(&intf->dev, "%s\n", __func__);
1493
1494         /* sibling interface is already cleaning up */
1495         if (!acm)
1496                 return;
1497
1498         mutex_lock(&acm->mutex);
1499         acm->disconnected = true;
1500         if (acm->country_codes) {
1501                 device_remove_file(&acm->control->dev,
1502                                 &dev_attr_wCountryCodes);
1503                 device_remove_file(&acm->control->dev,
1504                                 &dev_attr_iCountryCodeRelDate);
1505         }
1506         wake_up_all(&acm->wioctl);
1507         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1508         usb_set_intfdata(acm->control, NULL);
1509         usb_set_intfdata(acm->data, NULL);
1510         mutex_unlock(&acm->mutex);
1511
1512         tty = tty_port_tty_get(&acm->port);
1513         if (tty) {
1514                 tty_vhangup(tty);
1515                 tty_kref_put(tty);
1516         }
1517
1518         stop_data_traffic(acm);
1519
1520         tty_unregister_device(acm_tty_driver, acm->minor);
1521
1522         usb_free_urb(acm->ctrlurb);
1523         for (i = 0; i < ACM_NW; i++)
1524                 usb_free_urb(acm->wb[i].urb);
1525         for (i = 0; i < acm->rx_buflimit; i++)
1526                 usb_free_urb(acm->read_urbs[i]);
1527         acm_write_buffers_free(acm);
1528         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1529         acm_read_buffers_free(acm);
1530
1531         if (!acm->combined_interfaces)
1532                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1533                                         acm->data : acm->control);
1534
1535         tty_port_put(&acm->port);
1536 }
1537
1538 #ifdef CONFIG_PM
1539 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1540 {
1541         struct acm *acm = usb_get_intfdata(intf);
1542         int cnt;
1543
1544         spin_lock_irq(&acm->read_lock);
1545         spin_lock(&acm->write_lock);
1546         if (PMSG_IS_AUTO(message)) {
1547                 if (acm->transmitting) {
1548                         spin_unlock(&acm->write_lock);
1549                         spin_unlock_irq(&acm->read_lock);
1550                         return -EBUSY;
1551                 }
1552         }
1553         cnt = acm->susp_count++;
1554         spin_unlock(&acm->write_lock);
1555         spin_unlock_irq(&acm->read_lock);
1556
1557         if (cnt)
1558                 return 0;
1559
1560         stop_data_traffic(acm);
1561
1562         return 0;
1563 }
1564
1565 static int acm_resume(struct usb_interface *intf)
1566 {
1567         struct acm *acm = usb_get_intfdata(intf);
1568         struct urb *urb;
1569         int rv = 0;
1570
1571         spin_lock_irq(&acm->read_lock);
1572         spin_lock(&acm->write_lock);
1573
1574         if (--acm->susp_count)
1575                 goto out;
1576
1577         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1578                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1579
1580                 for (;;) {
1581                         urb = usb_get_from_anchor(&acm->delayed);
1582                         if (!urb)
1583                                 break;
1584
1585                         acm_start_wb(acm, urb->context);
1586                 }
1587
1588                 /*
1589                  * delayed error checking because we must
1590                  * do the write path at all cost
1591                  */
1592                 if (rv < 0)
1593                         goto out;
1594
1595                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1596         }
1597 out:
1598         spin_unlock(&acm->write_lock);
1599         spin_unlock_irq(&acm->read_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);