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