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