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                 goto error_submit_urb;
 532         }
 533
 534         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
 535         if (acm_set_control(acm, acm->ctrlout) < 0 &&
 536             (acm->ctrl_caps & USB_CDC_CAP_LINE)) {
 537                 goto error_set_control;
 538         }
 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         if (acm_submit_read_urbs(acm, GFP_KERNEL))
 549                 goto error_submit_read_urbs;
 550
 551         usb_autopm_put_interface(acm->control);
 552
 553         mutex_unlock(&acm->mutex);
 554
 555         return 0;
 556
 557 error_submit_read_urbs:
 558         acm->ctrlout = 0;
 559         acm_set_control(acm, acm->ctrlout);
 560 error_set_control:
 561         usb_kill_urb(acm->ctrlurb);
 562 error_submit_urb:
 563         usb_autopm_put_interface(acm->control);
 564 error_get_interface:
 565 disconnected:
 566         mutex_unlock(&acm->mutex);
 567         return retval;
 568 }
 569
 570 static void acm_port_destruct(struct tty_port *port)
 571 {
 572         struct acm *acm = container_of(port, struct acm, port);
 573
 574         dev_dbg(&acm->control->dev, "%s\n", __func__);
 575
 576         acm_release_minor(acm);
 577         usb_put_intf(acm->control);
 578         kfree(acm->country_codes);
 579         kfree(acm);
 580 }
 581
 582 static void acm_port_shutdown(struct tty_port *port)
 583 {
 584         struct acm *acm = container_of(port, struct acm, port);
 585         struct urb *urb;
 586         struct acm_wb *wb;
 587         int i;
 588
 589         dev_dbg(&acm->control->dev, "%s\n", __func__);
 590
 591         mutex_lock(&acm->mutex);
 592         if (!acm->disconnected) {
 593                 usb_autopm_get_interface(acm->control);
 594                 acm_set_control(acm, acm->ctrlout = 0);
 595
 596                 for (;;) {
 597                         urb = usb_get_from_anchor(&acm->delayed);
 598                         if (!urb)
 599                                 break;
 600                         wb = urb->context;
 601                         wb->use = 0;
 602                         usb_autopm_put_interface_async(acm->control);
 603                 }
 604
 605                 usb_kill_urb(acm->ctrlurb);
 606                 for (i = 0; i < ACM_NW; i++)
 607                         usb_kill_urb(acm->wb[i].urb);
 608                 for (i = 0; i < acm->rx_buflimit; i++)
 609                         usb_kill_urb(acm->read_urbs[i]);
 610                 acm->control->needs_remote_wakeup = 0;
 611                 usb_autopm_put_interface(acm->control);
 612         }
 613         mutex_unlock(&acm->mutex);
 614 }
 615
 616 static void acm_tty_cleanup(struct tty_struct *tty)
 617 {
 618         struct acm *acm = tty->driver_data;
 619         dev_dbg(&acm->control->dev, "%s\n", __func__);
 620         tty_port_put(&acm->port);
 621 }
 622
 623 static void acm_tty_hangup(struct tty_struct *tty)
 624 {
 625         struct acm *acm = tty->driver_data;
 626         dev_dbg(&acm->control->dev, "%s\n", __func__);
 627         tty_port_hangup(&acm->port);
 628 }
 629
 630 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 631 {
 632         struct acm *acm = tty->driver_data;
 633         dev_dbg(&acm->control->dev, "%s\n", __func__);
 634         tty_port_close(&acm->port, tty, filp);
 635 }
 636
 637 static int acm_tty_write(struct tty_struct *tty,
 638                                         const unsigned char *buf, int count)
 639 {
 640         struct acm *acm = tty->driver_data;
 641         int stat;
 642         unsigned long flags;
 643         int wbn;
 644         struct acm_wb *wb;
 645
 646         if (!count)
 647                 return 0;
 648
 649         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 650
 651         spin_lock_irqsave(&acm->write_lock, flags);
 652         wbn = acm_wb_alloc(acm);
 653         if (wbn < 0) {
 654                 spin_unlock_irqrestore(&acm->write_lock, flags);
 655                 return 0;
 656         }
 657         wb = &acm->wb[wbn];
 658
 659         if (!acm->dev) {
 660                 wb->use = 0;
 661                 spin_unlock_irqrestore(&acm->write_lock, flags);
 662                 return -ENODEV;
 663         }
 664
 665         count = (count > acm->writesize) ? acm->writesize : count;
 666         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 667         memcpy(wb->buf, buf, count);
 668         wb->len = count;
 669
 670         stat = usb_autopm_get_interface_async(acm->control);
 671         if (stat) {
 672                 wb->use = 0;
 673                 spin_unlock_irqrestore(&acm->write_lock, flags);
 674                 return stat;
 675         }
 676
 677         if (acm->susp_count) {
 678                 usb_anchor_urb(wb->urb, &acm->delayed);
 679                 spin_unlock_irqrestore(&acm->write_lock, flags);
 680                 return count;
 681         }
 682         usb_mark_last_busy(acm->dev);
 683
 684         stat = acm_start_wb(acm, wb);
 685         spin_unlock_irqrestore(&acm->write_lock, flags);
 686
 687         if (stat < 0)
 688                 return stat;
 689         return count;
 690 }
 691
 692 static int acm_tty_write_room(struct tty_struct *tty)
 693 {
 694         struct acm *acm = tty->driver_data;
 695         /*
 696          * Do not let the line discipline to know that we have a reserve,
 697          * or it might get too enthusiastic.
 698          */
 699         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 700 }
 701
 702 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 703 {
 704         struct acm *acm = tty->driver_data;
 705         /*
 706          * if the device was unplugged then any remaining characters fell out
 707          * of the connector ;)
 708          */
 709         if (acm->disconnected)
 710                 return 0;
 711         /*
 712          * This is inaccurate (overcounts), but it works.
 713          */
 714         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 715 }
 716
 717 static void acm_tty_throttle(struct tty_struct *tty)
 718 {
 719         struct acm *acm = tty->driver_data;
 720
 721         spin_lock_irq(&acm->read_lock);
 722         acm->throttle_req = 1;
 723         spin_unlock_irq(&acm->read_lock);
 724 }
 725
 726 static void acm_tty_unthrottle(struct tty_struct *tty)
 727 {
 728         struct acm *acm = tty->driver_data;
 729         unsigned int was_throttled;
 730
 731         spin_lock_irq(&acm->read_lock);
 732         was_throttled = acm->throttled;
 733         acm->throttled = 0;
 734         acm->throttle_req = 0;
 735         spin_unlock_irq(&acm->read_lock);
 736
 737         if (was_throttled)
 738                 acm_submit_read_urbs(acm, GFP_KERNEL);
 739 }
 740
 741 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 742 {
 743         struct acm *acm = tty->driver_data;
 744         int retval;
 745
 746         retval = acm_send_break(acm, state ? 0xffff : 0);
 747         if (retval < 0)
 748                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 749                                                                 __func__);
 750         return retval;
 751 }
 752
 753 static int acm_tty_tiocmget(struct tty_struct *tty)
 754 {
 755         struct acm *acm = tty->driver_data;
 756
 757         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 758                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 759                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 760                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 761                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 762                TIOCM_CTS;
 763 }
 764
 765 static int acm_tty_tiocmset(struct tty_struct *tty,
 766                             unsigned int set, unsigned int clear)
 767 {
 768         struct acm *acm = tty->driver_data;
 769         unsigned int newctrl;
 770
 771         newctrl = acm->ctrlout;
 772         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 773                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 774         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 775                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 776
 777         newctrl = (newctrl & ~clear) | set;
 778
 779         if (acm->ctrlout == newctrl)
 780                 return 0;
 781         return acm_set_control(acm, acm->ctrlout = newctrl);
 782 }
 783
 784 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 785 {
 786         struct serial_struct tmp;
 787
 788         if (!info)
 789                 return -EINVAL;
 790
 791         memset(&tmp, 0, sizeof(tmp));
 792         tmp.flags = ASYNC_LOW_LATENCY;
 793         tmp.xmit_fifo_size = acm->writesize;
 794         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 795         tmp.close_delay = acm->port.close_delay / 10;
 796         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 797                                 ASYNC_CLOSING_WAIT_NONE :
 798                                 acm->port.closing_wait / 10;
 799
 800         if (copy_to_user(info, &tmp, sizeof(tmp)))
 801                 return -EFAULT;
 802         else
 803                 return 0;
 804 }
 805
 806 static int set_serial_info(struct acm *acm,
 807                                 struct serial_struct __user *newinfo)
 808 {
 809         struct serial_struct new_serial;
 810         unsigned int closing_wait, close_delay;
 811         int retval = 0;
 812
 813         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 814                 return -EFAULT;
 815
 816         close_delay = new_serial.close_delay * 10;
 817         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 818                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 819
 820         mutex_lock(&acm->port.mutex);
 821
 822         if (!capable(CAP_SYS_ADMIN)) {
 823                 if ((close_delay != acm->port.close_delay) ||
 824                     (closing_wait != acm->port.closing_wait))
 825                         retval = -EPERM;
 826                 else
 827                         retval = -EOPNOTSUPP;
 828         } else {
 829                 acm->port.close_delay  = close_delay;
 830                 acm->port.closing_wait = closing_wait;
 831         }
 832
 833         mutex_unlock(&acm->port.mutex);
 834         return retval;
 835 }
 836
 837 static int wait_serial_change(struct acm *acm, unsigned long arg)
 838 {
 839         int rv = 0;
 840         DECLARE_WAITQUEUE(wait, current);
 841         struct async_icount old, new;
 842
 843         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
 844                 return -EINVAL;
 845         do {
 846                 spin_lock_irq(&acm->read_lock);
 847                 old = acm->oldcount;
 848                 new = acm->iocount;
 849                 acm->oldcount = new;
 850                 spin_unlock_irq(&acm->read_lock);
 851
 852                 if ((arg & TIOCM_DSR) &&
 853                         old.dsr != new.dsr)
 854                         break;
 855                 if ((arg & TIOCM_CD)  &&
 856                         old.dcd != new.dcd)
 857                         break;
 858                 if ((arg & TIOCM_RI) &&
 859                         old.rng != new.rng)
 860                         break;
 861
 862                 add_wait_queue(&acm->wioctl, &wait);
 863                 set_current_state(TASK_INTERRUPTIBLE);
 864                 schedule();
 865                 remove_wait_queue(&acm->wioctl, &wait);
 866                 if (acm->disconnected) {
 867                         if (arg & TIOCM_CD)
 868                                 break;
 869                         else
 870                                 rv = -ENODEV;
 871                 } else {
 872                         if (signal_pending(current))
 873                                 rv = -ERESTARTSYS;
 874                 }
 875         } while (!rv);
 876
 877
 878
 879         return rv;
 880 }
 881
 882 static int get_serial_usage(struct acm *acm,
 883                             struct serial_icounter_struct __user *count)
 884 {
 885         struct serial_icounter_struct icount;
 886         int rv = 0;
 887
 888         memset(&icount, 0, sizeof(icount));
 889         icount.dsr = acm->iocount.dsr;
 890         icount.rng = acm->iocount.rng;
 891         icount.dcd = acm->iocount.dcd;
 892         icount.frame = acm->iocount.frame;
 893         icount.overrun = acm->iocount.overrun;
 894         icount.parity = acm->iocount.parity;
 895         icount.brk = acm->iocount.brk;
 896
 897         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 898                 rv = -EFAULT;
 899
 900         return rv;
 901 }
 902
 903 static int acm_tty_ioctl(struct tty_struct *tty,
 904                                         unsigned int cmd, unsigned long arg)
 905 {
 906         struct acm *acm = tty->driver_data;
 907         int rv = -ENOIOCTLCMD;
 908
 909         switch (cmd) {
 910         case TIOCGSERIAL: /* gets serial port data */
 911                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 912                 break;
 913         case TIOCSSERIAL:
 914                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 915                 break;
 916         case TIOCMIWAIT:
 917                 rv = usb_autopm_get_interface(acm->control);
 918                 if (rv < 0) {
 919                         rv = -EIO;
 920                         break;
 921                 }
 922                 rv = wait_serial_change(acm, arg);
 923                 usb_autopm_put_interface(acm->control);
 924                 break;
 925         case TIOCGICOUNT:
 926                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
 927                 break;
 928         }
 929
 930         return rv;
 931 }
 932
 933 static void acm_tty_set_termios(struct tty_struct *tty,
 934                                                 struct ktermios *termios_old)
 935 {
 936         struct acm *acm = tty->driver_data;
 937         struct ktermios *termios = &tty->termios;
 938         struct usb_cdc_line_coding newline;
 939         int newctrl = acm->ctrlout;
 940
 941         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 942         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 943         newline.bParityType = termios->c_cflag & PARENB ?
 944                                 (termios->c_cflag & PARODD ? 1 : 2) +
 945                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 946         switch (termios->c_cflag & CSIZE) {
 947         case CS5:
 948                 newline.bDataBits = 5;
 949                 break;
 950         case CS6:
 951                 newline.bDataBits = 6;
 952                 break;
 953         case CS7:
 954                 newline.bDataBits = 7;
 955                 break;
 956         case CS8:
 957         default:
 958                 newline.bDataBits = 8;
 959                 break;
 960         }
 961         /* FIXME: Needs to clear unsupported bits in the termios */
 962         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 963
 964         if (!newline.dwDTERate) {
 965                 newline.dwDTERate = acm->line.dwDTERate;
 966                 newctrl &= ~ACM_CTRL_DTR;
 967         } else
 968                 newctrl |=  ACM_CTRL_DTR;
 969
 970         if (newctrl != acm->ctrlout)
 971                 acm_set_control(acm, acm->ctrlout = newctrl);
 972
 973         if (memcmp(&acm->line, &newline, sizeof newline)) {
 974                 memcpy(&acm->line, &newline, sizeof newline);
 975                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 976                         __func__,
 977                         le32_to_cpu(newline.dwDTERate),
 978                         newline.bCharFormat, newline.bParityType,
 979                         newline.bDataBits);
 980                 acm_set_line(acm, &acm->line);
 981         }
 982 }
 983
 984 static const struct tty_port_operations acm_port_ops = {
 985         .shutdown = acm_port_shutdown,
 986         .activate = acm_port_activate,
 987         .destruct = acm_port_destruct,
 988 };
 989
 990 /*
 991  * USB probe and disconnect routines.
 992  */
 993
 994 /* Little helpers: write/read buffers free */
 995 static void acm_write_buffers_free(struct acm *acm)
 996 {
 997         int i;
 998         struct acm_wb *wb;
 999         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1000
1001         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1002                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1003 }
1004
1005 static void acm_read_buffers_free(struct acm *acm)
1006 {
1007         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1008         int i;
1009
1010         for (i = 0; i < acm->rx_buflimit; i++)
1011                 usb_free_coherent(usb_dev, acm->readsize,
1012                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1013 }
1014
1015 /* Little helper: write buffers allocate */
1016 static int acm_write_buffers_alloc(struct acm *acm)
1017 {
1018         int i;
1019         struct acm_wb *wb;
1020
1021         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1022                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1023                     &wb->dmah);
1024                 if (!wb->buf) {
1025                         while (i != 0) {
1026                                 --i;
1027                                 --wb;
1028                                 usb_free_coherent(acm->dev, acm->writesize,
1029                                     wb->buf, wb->dmah);
1030                         }
1031                         return -ENOMEM;
1032                 }
1033         }
1034         return 0;
1035 }
1036
1037 static int acm_probe(struct usb_interface *intf,
1038                      const struct usb_device_id *id)
1039 {
1040         struct usb_cdc_union_desc *union_header = NULL;
1041         struct usb_cdc_country_functional_desc *cfd = NULL;
1042         unsigned char *buffer = intf->altsetting->extra;
1043         int buflen = intf->altsetting->extralen;
1044         struct usb_interface *control_interface;
1045         struct usb_interface *data_interface;
1046         struct usb_endpoint_descriptor *epctrl = NULL;
1047         struct usb_endpoint_descriptor *epread = NULL;
1048         struct usb_endpoint_descriptor *epwrite = NULL;
1049         struct usb_device *usb_dev = interface_to_usbdev(intf);
1050         struct acm *acm;
1051         int minor;
1052         int ctrlsize, readsize;
1053         u8 *buf;
1054         u8 ac_management_function = 0;
1055         u8 call_management_function = 0;
1056         int call_interface_num = -1;
1057         int data_interface_num = -1;
1058         unsigned long quirks;
1059         int num_rx_buf;
1060         int i;
1061         int combined_interfaces = 0;
1062         struct device *tty_dev;
1063         int rv = -ENOMEM;
1064
1065         /* normal quirks */
1066         quirks = (unsigned long)id->driver_info;
1067
1068         if (quirks == IGNORE_DEVICE)
1069                 return -ENODEV;
1070
1071         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1072
1073         /* handle quirks deadly to normal probing*/
1074         if (quirks == NO_UNION_NORMAL) {
1075                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1076                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1077                 goto skip_normal_probe;
1078         }
1079
1080         /* normal probing*/
1081         if (!buffer) {
1082                 dev_err(&intf->dev, "Weird descriptor references\n");
1083                 return -EINVAL;
1084         }
1085
1086         if (!buflen) {
1087                 if (intf->cur_altsetting->endpoint &&
1088                                 intf->cur_altsetting->endpoint->extralen &&
1089                                 intf->cur_altsetting->endpoint->extra) {
1090                         dev_dbg(&intf->dev,
1091                                 "Seeking extra descriptors on endpoint\n");
1092                         buflen = intf->cur_altsetting->endpoint->extralen;
1093                         buffer = intf->cur_altsetting->endpoint->extra;
1094                 } else {
1095                         dev_err(&intf->dev,
1096                                 "Zero length descriptor references\n");
1097                         return -EINVAL;
1098                 }
1099         }
1100
1101         while (buflen > 0) {
1102                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1103                         dev_err(&intf->dev, "skipping garbage\n");
1104                         goto next_desc;
1105                 }
1106
1107                 switch (buffer[2]) {
1108                 case USB_CDC_UNION_TYPE: /* we've found it */
1109                         if (union_header) {
1110                                 dev_err(&intf->dev, "More than one "
1111                                         "union descriptor, skipping ...\n");
1112                                 goto next_desc;
1113                         }
1114                         union_header = (struct usb_cdc_union_desc *)buffer;
1115                         break;
1116                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1117                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1118                         break;
1119                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1120                         break; /* for now we ignore it */
1121                 case USB_CDC_ACM_TYPE:
1122                         ac_management_function = buffer[3];
1123                         break;
1124                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1125                         call_management_function = buffer[3];
1126                         call_interface_num = buffer[4];
1127                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1128                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1129                         break;
1130                 default:
1131                         /* there are LOTS more CDC descriptors that
1132                          * could legitimately be found here.
1133                          */
1134                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1135                                         "type %02x, length %d\n",
1136                                         buffer[2], buffer[0]);
1137                         break;
1138                 }
1139 next_desc:
1140                 buflen -= buffer[0];
1141                 buffer += buffer[0];
1142         }
1143
1144         if (!union_header) {
1145                 if (call_interface_num > 0) {
1146                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1147                         /* quirks for Droids MuIn LCD */
1148                         if (quirks & NO_DATA_INTERFACE)
1149                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1150                         else
1151                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1152                         control_interface = intf;
1153                 } else {
1154                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1155                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1156                                 return -ENODEV;
1157                         } else {
1158                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1159                                 combined_interfaces = 1;
1160                                 control_interface = data_interface = intf;
1161                                 goto look_for_collapsed_interface;
1162                         }
1163                 }
1164         } else {
1165                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1166                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1167                 if (!control_interface || !data_interface) {
1168                         dev_dbg(&intf->dev, "no interfaces\n");
1169                         return -ENODEV;
1170                 }
1171         }
1172
1173         if (data_interface_num != call_interface_num)
1174                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1175
1176         if (control_interface == data_interface) {
1177                 /* some broken devices designed for windows work this way */
1178                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1179                 combined_interfaces = 1;
1180                 /* a popular other OS doesn't use it */
1181                 quirks |= NO_CAP_LINE;
1182                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1183                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1184                         return -EINVAL;
1185                 }
1186 look_for_collapsed_interface:
1187                 for (i = 0; i < 3; i++) {
1188                         struct usb_endpoint_descriptor *ep;
1189                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1190
1191                         if (usb_endpoint_is_int_in(ep))
1192                                 epctrl = ep;
1193                         else if (usb_endpoint_is_bulk_out(ep))
1194                                 epwrite = ep;
1195                         else if (usb_endpoint_is_bulk_in(ep))
1196                                 epread = ep;
1197                         else
1198                                 return -EINVAL;
1199                 }
1200                 if (!epctrl || !epread || !epwrite)
1201                         return -ENODEV;
1202                 else
1203                         goto made_compressed_probe;
1204         }
1205
1206 skip_normal_probe:
1207
1208         /*workaround for switched interfaces */
1209         if (data_interface->cur_altsetting->desc.bInterfaceClass
1210                                                 != CDC_DATA_INTERFACE_TYPE) {
1211                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1212                                                 == CDC_DATA_INTERFACE_TYPE) {
1213                         struct usb_interface *t;
1214                         dev_dbg(&intf->dev,
1215                                 "Your device has switched interfaces.\n");
1216                         t = control_interface;
1217                         control_interface = data_interface;
1218                         data_interface = t;
1219                 } else {
1220                         return -EINVAL;
1221                 }
1222         }
1223
1224         /* Accept probe requests only for the control interface */
1225         if (!combined_interfaces && intf != control_interface)
1226                 return -ENODEV;
1227
1228         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1229                 /* valid in this context */
1230                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1231                 return -EBUSY;
1232         }
1233
1234
1235         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1236             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1237                 return -EINVAL;
1238
1239         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1240         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1241         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1242
1243
1244         /* workaround for switched endpoints */
1245         if (!usb_endpoint_dir_in(epread)) {
1246                 /* descriptors are swapped */
1247                 struct usb_endpoint_descriptor *t;
1248                 dev_dbg(&intf->dev,
1249                         "The data interface has switched endpoints\n");
1250                 t = epread;
1251                 epread = epwrite;
1252                 epwrite = t;
1253         }
1254 made_compressed_probe:
1255         dev_dbg(&intf->dev, "interfaces are valid\n");
1256
1257         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1258         if (acm == NULL) {
1259                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1260                 goto alloc_fail;
1261         }
1262
1263         minor = acm_alloc_minor(acm);
1264         if (minor == ACM_TTY_MINORS) {
1265                 dev_err(&intf->dev, "no more free acm devices\n");
1266                 kfree(acm);
1267                 return -ENODEV;
1268         }
1269
1270         ctrlsize = usb_endpoint_maxp(epctrl);
1271         readsize = usb_endpoint_maxp(epread) *
1272                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1273         acm->combined_interfaces = combined_interfaces;
1274         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1275         acm->control = control_interface;
1276         acm->data = data_interface;
1277         acm->minor = minor;
1278         acm->dev = usb_dev;
1279         acm->ctrl_caps = ac_management_function;
1280         if (quirks & NO_CAP_LINE)
1281                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1282         acm->ctrlsize = ctrlsize;
1283         acm->readsize = readsize;
1284         acm->rx_buflimit = num_rx_buf;
1285         INIT_WORK(&acm->work, acm_softint);
1286         init_waitqueue_head(&acm->wioctl);
1287         spin_lock_init(&acm->write_lock);
1288         spin_lock_init(&acm->read_lock);
1289         mutex_init(&acm->mutex);
1290         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1291         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1292         if (acm->is_int_ep)
1293                 acm->bInterval = epread->bInterval;
1294         tty_port_init(&acm->port);
1295         acm->port.ops = &acm_port_ops;
1296         init_usb_anchor(&acm->delayed);
1297
1298         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1299         if (!buf) {
1300                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1301                 goto alloc_fail2;
1302         }
1303         acm->ctrl_buffer = buf;
1304
1305         if (acm_write_buffers_alloc(acm) < 0) {
1306                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1307                 goto alloc_fail4;
1308         }
1309
1310         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1311         if (!acm->ctrlurb) {
1312                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1313                 goto alloc_fail5;
1314         }
1315         for (i = 0; i < num_rx_buf; i++) {
1316                 struct acm_rb *rb = &(acm->read_buffers[i]);
1317                 struct urb *urb;
1318
1319                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1320                                                                 &rb->dma);
1321                 if (!rb->base) {
1322                         dev_err(&intf->dev, "out of memory "
1323                                         "(read bufs usb_alloc_coherent)\n");
1324                         goto alloc_fail6;
1325                 }
1326                 rb->index = i;
1327                 rb->instance = acm;
1328
1329                 urb = usb_alloc_urb(0, GFP_KERNEL);
1330                 if (!urb) {
1331                         dev_err(&intf->dev,
1332                                 "out of memory (read urbs usb_alloc_urb)\n");
1333                         goto alloc_fail6;
1334                 }
1335                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1336                 urb->transfer_dma = rb->dma;
1337                 if (acm->is_int_ep) {
1338                         usb_fill_int_urb(urb, acm->dev,
1339                                          acm->rx_endpoint,
1340                                          rb->base,
1341                                          acm->readsize,
1342                                          acm_read_bulk_callback, rb,
1343                                          acm->bInterval);
1344                 } else {
1345                         usb_fill_bulk_urb(urb, acm->dev,
1346                                           acm->rx_endpoint,
1347                                           rb->base,
1348                                           acm->readsize,
1349                                           acm_read_bulk_callback, rb);
1350                 }
1351
1352                 acm->read_urbs[i] = urb;
1353                 __set_bit(i, &acm->read_urbs_free);
1354         }
1355         for (i = 0; i < ACM_NW; i++) {
1356                 struct acm_wb *snd = &(acm->wb[i]);
1357
1358                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1359                 if (snd->urb == NULL) {
1360                         dev_err(&intf->dev,
1361                                 "out of memory (write urbs usb_alloc_urb)\n");
1362                         goto alloc_fail7;
1363                 }
1364
1365                 if (usb_endpoint_xfer_int(epwrite))
1366                         usb_fill_int_urb(snd->urb, usb_dev,
1367                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1368                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1369                 else
1370                         usb_fill_bulk_urb(snd->urb, usb_dev,
1371                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1372                                 NULL, acm->writesize, acm_write_bulk, snd);
1373                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1374                 snd->instance = acm;
1375         }
1376
1377         usb_set_intfdata(intf, acm);
1378
1379         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1380         if (i < 0)
1381                 goto alloc_fail7;
1382
1383         if (cfd) { /* export the country data */
1384                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1385                 if (!acm->country_codes)
1386                         goto skip_countries;
1387                 acm->country_code_size = cfd->bLength - 4;
1388                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1389                                                         cfd->bLength - 4);
1390                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1391
1392                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1393                 if (i < 0) {
1394                         kfree(acm->country_codes);
1395                         acm->country_codes = NULL;
1396                         acm->country_code_size = 0;
1397                         goto skip_countries;
1398                 }
1399
1400                 i = device_create_file(&intf->dev,
1401                                                 &dev_attr_iCountryCodeRelDate);
1402                 if (i < 0) {
1403                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1404                         kfree(acm->country_codes);
1405                         acm->country_codes = NULL;
1406                         acm->country_code_size = 0;
1407                         goto skip_countries;
1408                 }
1409         }
1410
1411 skip_countries:
1412         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1413                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1414                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1415                          /* works around buggy devices */
1416                          epctrl->bInterval ? epctrl->bInterval : 16);
1417         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1418         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1419
1420         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1421
1422         acm_set_control(acm, acm->ctrlout);
1423
1424         acm->line.dwDTERate = cpu_to_le32(9600);
1425         acm->line.bDataBits = 8;
1426         acm_set_line(acm, &acm->line);
1427
1428         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1429         usb_set_intfdata(data_interface, acm);
1430
1431         usb_get_intf(control_interface);
1432         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1433                         &control_interface->dev);
1434         if (IS_ERR(tty_dev)) {
1435                 rv = PTR_ERR(tty_dev);
1436                 goto alloc_fail8;
1437         }
1438
1439         return 0;
1440 alloc_fail8:
1441         if (acm->country_codes) {
1442                 device_remove_file(&acm->control->dev,
1443                                 &dev_attr_wCountryCodes);
1444                 device_remove_file(&acm->control->dev,
1445                                 &dev_attr_iCountryCodeRelDate);
1446         }
1447         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1448 alloc_fail7:
1449         usb_set_intfdata(intf, NULL);
1450         for (i = 0; i < ACM_NW; i++)
1451                 usb_free_urb(acm->wb[i].urb);
1452 alloc_fail6:
1453         for (i = 0; i < num_rx_buf; i++)
1454                 usb_free_urb(acm->read_urbs[i]);
1455         acm_read_buffers_free(acm);
1456         usb_free_urb(acm->ctrlurb);
1457 alloc_fail5:
1458         acm_write_buffers_free(acm);
1459 alloc_fail4:
1460         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1461 alloc_fail2:
1462         acm_release_minor(acm);
1463         kfree(acm);
1464 alloc_fail:
1465         return rv;
1466 }
1467
1468 static void stop_data_traffic(struct acm *acm)
1469 {
1470         int i;
1471
1472         dev_dbg(&acm->control->dev, "%s\n", __func__);
1473
1474         usb_kill_urb(acm->ctrlurb);
1475         for (i = 0; i < ACM_NW; i++)
1476                 usb_kill_urb(acm->wb[i].urb);
1477         for (i = 0; i < acm->rx_buflimit; i++)
1478                 usb_kill_urb(acm->read_urbs[i]);
1479
1480         cancel_work_sync(&acm->work);
1481 }
1482
1483 static void acm_disconnect(struct usb_interface *intf)
1484 {
1485         struct acm *acm = usb_get_intfdata(intf);
1486         struct usb_device *usb_dev = interface_to_usbdev(intf);
1487         struct tty_struct *tty;
1488         int i;
1489
1490         dev_dbg(&intf->dev, "%s\n", __func__);
1491
1492         /* sibling interface is already cleaning up */
1493         if (!acm)
1494                 return;
1495
1496         mutex_lock(&acm->mutex);
1497         acm->disconnected = true;
1498         if (acm->country_codes) {
1499                 device_remove_file(&acm->control->dev,
1500                                 &dev_attr_wCountryCodes);
1501                 device_remove_file(&acm->control->dev,
1502                                 &dev_attr_iCountryCodeRelDate);
1503         }
1504         wake_up_all(&acm->wioctl);
1505         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1506         usb_set_intfdata(acm->control, NULL);
1507         usb_set_intfdata(acm->data, NULL);
1508         mutex_unlock(&acm->mutex);
1509
1510         tty = tty_port_tty_get(&acm->port);
1511         if (tty) {
1512                 tty_vhangup(tty);
1513                 tty_kref_put(tty);
1514         }
1515
1516         stop_data_traffic(acm);
1517
1518         tty_unregister_device(acm_tty_driver, acm->minor);
1519
1520         usb_free_urb(acm->ctrlurb);
1521         for (i = 0; i < ACM_NW; i++)
1522                 usb_free_urb(acm->wb[i].urb);
1523         for (i = 0; i < acm->rx_buflimit; i++)
1524                 usb_free_urb(acm->read_urbs[i]);
1525         acm_write_buffers_free(acm);
1526         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1527         acm_read_buffers_free(acm);
1528
1529         if (!acm->combined_interfaces)
1530                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1531                                         acm->data : acm->control);
1532
1533         tty_port_put(&acm->port);
1534 }
1535
1536 #ifdef CONFIG_PM
1537 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1538 {
1539         struct acm *acm = usb_get_intfdata(intf);
1540         int cnt;
1541
1542         spin_lock_irq(&acm->read_lock);
1543         spin_lock(&acm->write_lock);
1544         if (PMSG_IS_AUTO(message)) {
1545                 if (acm->transmitting) {
1546                         spin_unlock(&acm->write_lock);
1547                         spin_unlock_irq(&acm->read_lock);
1548                         return -EBUSY;
1549                 }
1550         }
1551         cnt = acm->susp_count++;
1552         spin_unlock(&acm->write_lock);
1553         spin_unlock_irq(&acm->read_lock);
1554
1555         if (cnt)
1556                 return 0;
1557
1558         stop_data_traffic(acm);
1559
1560         return 0;
1561 }
1562
1563 static int acm_resume(struct usb_interface *intf)
1564 {
1565         struct acm *acm = usb_get_intfdata(intf);
1566         struct urb *urb;
1567         int rv = 0;
1568
1569         spin_lock_irq(&acm->read_lock);
1570         spin_lock(&acm->write_lock);
1571
1572         if (--acm->susp_count)
1573                 goto out;
1574
1575         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1576                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1577
1578                 for (;;) {
1579                         urb = usb_get_from_anchor(&acm->delayed);
1580                         if (!urb)
1581                                 break;
1582
1583                         acm_start_wb(acm, urb->context);
1584                 }
1585
1586                 /*
1587                  * delayed error checking because we must
1588                  * do the write path at all cost
1589                  */
1590                 if (rv < 0)
1591                         goto out;
1592
1593                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1594         }
1595 out:
1596         spin_unlock(&acm->write_lock);
1597         spin_unlock_irq(&acm->read_lock);
1598
1599         return rv;
1600 }
1601
1602 static int acm_reset_resume(struct usb_interface *intf)
1603 {
1604         struct acm *acm = usb_get_intfdata(intf);
1605
1606         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1607                 tty_port_tty_hangup(&acm->port, false);
1608
1609         return acm_resume(intf);
1610 }
1611
1612 #endif /* CONFIG_PM */
1613
1614 #define NOKIA_PCSUITE_ACM_INFO(x) \
1615                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1616                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1617                 USB_CDC_ACM_PROTO_VENDOR)
1618
1619 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1620                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1621                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1622                 USB_CDC_ACM_PROTO_VENDOR)
1623
1624 /*
1625  * USB driver structure.
1626  */
1627
1628 static const struct usb_device_id acm_ids[] = {
1629         /* quirky and broken devices */
1630         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1631         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1632         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1633         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1634         },
1635         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1636         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1637         },
1638         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1639         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1640         },
1641         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1642         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1643         },
1644         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1645         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1646         },
1647         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1648         .driver_info = SINGLE_RX_URB,
1649         },
1650         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1651         .driver_info = SINGLE_RX_URB, /* firmware bug */
1652         },
1653         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1654         .driver_info = SINGLE_RX_URB, /* firmware bug */
1655         },
1656         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1657         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1658         },
1659         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1660         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1661         },
1662         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1663         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1664         },
1665         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1666         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1667         },
1668         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1669         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1670         },
1671         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1672         },
1673         /* Motorola H24 HSPA module: */
1674         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1675         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1676         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1677         },
1678         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1679         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1680         },
1681         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1682         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1683         },
1684         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1685         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1686         },
1687         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1688         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1689         },
1690         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1691         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1692         },
1693         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1694         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1695         },
1696
1697         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1698         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1699                                            data interface instead of
1700                                            communications interface.
1701                                            Maybe we should define a new
1702                                            quirk for this. */
1703         },
1704         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1705         .driver_info = NO_UNION_NORMAL,
1706         },
1707         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1708         .driver_info = NO_UNION_NORMAL,
1709         },
1710         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1711         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1712         },
1713         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1714         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1715         },
1716
1717         /* Nokia S60 phones expose two ACM channels. The first is
1718          * a modem and is picked up by the standard AT-command
1719          * information below. The second is 'vendor-specific' but
1720          * is treated as a serial device at the S60 end, so we want
1721          * to expose it on Linux too. */
1722         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1723         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1724         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1725         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1726         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1727         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1728         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1729         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1730         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1731         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1732         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1733         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1734         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1735         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1736         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1737         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1738         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1739         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1740         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1741         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1742         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1743         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1744         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1745         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1746         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1747         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1748         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1749         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1750         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1751         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1752         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1753         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1754         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1755         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1756         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1757         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1758         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1759         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1760         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1761         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1762         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1763         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1764         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1765         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1766         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1767         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1768         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1769         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1770         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1771         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1772         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1773         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1774         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1775         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1776         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1777         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1778         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1779         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1780
1781         /* Support for Owen devices */
1782         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1783
1784         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1785
1786         /* Support Lego NXT using pbLua firmware */
1787         { USB_DEVICE(0x0694, 0xff00),
1788         .driver_info = NOT_A_MODEM,
1789         },
1790
1791         /* Support for Droids MuIn LCD */
1792         { USB_DEVICE(0x04d8, 0x000b),
1793         .driver_info = NO_DATA_INTERFACE,
1794         },
1795
1796 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1797         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1798         .driver_info = IGNORE_DEVICE,
1799         },
1800         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1801         .driver_info = IGNORE_DEVICE,
1802         },
1803 #endif
1804
1805         /* control interfaces without any protocol set */
1806         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1807                 USB_CDC_PROTO_NONE) },
1808
1809         /* control interfaces with various AT-command sets */
1810         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1811                 USB_CDC_ACM_PROTO_AT_V25TER) },
1812         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1813                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1814         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1815                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1816         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1817                 USB_CDC_ACM_PROTO_AT_GSM) },
1818         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1819                 USB_CDC_ACM_PROTO_AT_3G) },
1820         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1821                 USB_CDC_ACM_PROTO_AT_CDMA) },
1822
1823         { }
1824 };
1825
1826 MODULE_DEVICE_TABLE(usb, acm_ids);
1827
1828 static struct usb_driver acm_driver = {
1829         .name =         "cdc_acm",
1830         .probe =        acm_probe,
1831         .disconnect =   acm_disconnect,
1832 #ifdef CONFIG_PM
1833         .suspend =      acm_suspend,
1834         .resume =       acm_resume,
1835         .reset_resume = acm_reset_resume,
1836 #endif
1837         .id_table =     acm_ids,
1838 #ifdef CONFIG_PM
1839         .supports_autosuspend = 1,
1840 #endif
1841         .disable_hub_initiated_lpm = 1,
1842 };
1843
1844 /*
1845  * TTY driver structures.
1846  */
1847
1848 static const struct tty_operations acm_ops = {
1849         .install =              acm_tty_install,
1850         .open =                 acm_tty_open,
1851         .close =                acm_tty_close,
1852         .cleanup =              acm_tty_cleanup,
1853         .hangup =               acm_tty_hangup,
1854         .write =                acm_tty_write,
1855         .write_room =           acm_tty_write_room,
1856         .ioctl =                acm_tty_ioctl,
1857         .throttle =             acm_tty_throttle,
1858         .unthrottle =           acm_tty_unthrottle,
1859         .chars_in_buffer =      acm_tty_chars_in_buffer,
1860         .break_ctl =            acm_tty_break_ctl,
1861         .set_termios =          acm_tty_set_termios,
1862         .tiocmget =             acm_tty_tiocmget,
1863         .tiocmset =             acm_tty_tiocmset,
1864 };
1865
1866 /*
1867  * Init / exit.
1868  */
1869
1870 static int __init acm_init(void)
1871 {
1872         int retval;
1873         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1874         if (!acm_tty_driver)
1875                 return -ENOMEM;
1876         acm_tty_driver->driver_name = "acm",
1877         acm_tty_driver->name = "ttyACM",
1878         acm_tty_driver->major = ACM_TTY_MAJOR,
1879         acm_tty_driver->minor_start = 0,
1880         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1881         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1882         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1883         acm_tty_driver->init_termios = tty_std_termios;
1884         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1885                                                                 HUPCL | CLOCAL;
1886         tty_set_operations(acm_tty_driver, &acm_ops);
1887
1888         retval = tty_register_driver(acm_tty_driver);
1889         if (retval) {
1890                 put_tty_driver(acm_tty_driver);
1891                 return retval;
1892         }
1893
1894         retval = usb_register(&acm_driver);
1895         if (retval) {
1896                 tty_unregister_driver(acm_tty_driver);
1897                 put_tty_driver(acm_tty_driver);
1898                 return retval;
1899         }
1900
1901         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1902
1903         return 0;
1904 }
1905
1906 static void __exit acm_exit(void)
1907 {
1908         usb_deregister(&acm_driver);
1909         tty_unregister_driver(acm_tty_driver);
1910         put_tty_driver(acm_tty_driver);
1911 }
1912
1913 module_init(acm_init);
1914 module_exit(acm_exit);
1915
1916 MODULE_AUTHOR(DRIVER_AUTHOR);
1917 MODULE_DESCRIPTION(DRIVER_DESC);
1918 MODULE_LICENSE("GPL");
1919 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);