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(open_mutex);
  62
  63 #define ACM_READY(acm)  (acm && acm->dev && acm->port.count)
  64
  65 static const struct tty_port_operations acm_port_ops = {
  66 };
  67
  68 /*
  69  * Functions for ACM control messages.
  70  */
  71
  72 static int acm_ctrl_msg(struct acm *acm, int request, int value,
  73                                                         void *buf, int len)
  74 {
  75         int retval;
  76
  77         retval = usb_autopm_get_interface(acm->control);
  78         if (retval)
  79                 return retval;
  80
  81         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
  82                 request, USB_RT_ACM, value,
  83                 acm->control->altsetting[0].desc.bInterfaceNumber,
  84                 buf, len, 5000);
  85
  86         dev_dbg(&acm->control->dev,
  87                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
  88                         __func__, request, value, len, retval);
  89
  90         usb_autopm_put_interface(acm->control);
  91
  92         return retval < 0 ? retval : 0;
  93 }
  94
  95 /* devices aren't required to support these requests.
  96  * the cdc acm descriptor tells whether they do...
  97  */
  98 #define acm_set_control(acm, control) \
  99         acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
 100 #define acm_set_line(acm, line) \
 101         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 102 #define acm_send_break(acm, ms) \
 103         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 104
 105 /*
 106  * Write buffer management.
 107  * All of these assume proper locks taken by the caller.
 108  */
 109
 110 static int acm_wb_alloc(struct acm *acm)
 111 {
 112         int i, wbn;
 113         struct acm_wb *wb;
 114
 115         wbn = 0;
 116         i = 0;
 117         for (;;) {
 118                 wb = &acm->wb[wbn];
 119                 if (!wb->use) {
 120                         wb->use = 1;
 121                         return wbn;
 122                 }
 123                 wbn = (wbn + 1) % ACM_NW;
 124                 if (++i >= ACM_NW)
 125                         return -1;
 126         }
 127 }
 128
 129 static int acm_wb_is_avail(struct acm *acm)
 130 {
 131         int i, n;
 132         unsigned long flags;
 133
 134         n = ACM_NW;
 135         spin_lock_irqsave(&acm->write_lock, flags);
 136         for (i = 0; i < ACM_NW; i++)
 137                 n -= acm->wb[i].use;
 138         spin_unlock_irqrestore(&acm->write_lock, flags);
 139         return n;
 140 }
 141
 142 /*
 143  * Finish write. Caller must hold acm->write_lock
 144  */
 145 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 146 {
 147         wb->use = 0;
 148         acm->transmitting--;
 149         usb_autopm_put_interface_async(acm->control);
 150 }
 151
 152 /*
 153  * Poke write.
 154  *
 155  * the caller is responsible for locking
 156  */
 157
 158 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 159 {
 160         int rc;
 161
 162         acm->transmitting++;
 163
 164         wb->urb->transfer_buffer = wb->buf;
 165         wb->urb->transfer_dma = wb->dmah;
 166         wb->urb->transfer_buffer_length = wb->len;
 167         wb->urb->dev = acm->dev;
 168
 169         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 170         if (rc < 0) {
 171                 dev_err(&acm->data->dev,
 172                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 173                         __func__, rc);
 174                 acm_write_done(acm, wb);
 175         }
 176         return rc;
 177 }
 178
 179 static int acm_write_start(struct acm *acm, int wbn)
 180 {
 181         unsigned long flags;
 182         struct acm_wb *wb = &acm->wb[wbn];
 183         int rc;
 184
 185         spin_lock_irqsave(&acm->write_lock, flags);
 186         if (!acm->dev) {
 187                 wb->use = 0;
 188                 spin_unlock_irqrestore(&acm->write_lock, flags);
 189                 return -ENODEV;
 190         }
 191
 192         dev_vdbg(&acm->data->dev, "%s - susp_count %d\n", __func__,
 193                                                         acm->susp_count);
 194         rc = usb_autopm_get_interface_async(acm->control);
 195         if (rc) {
 196                 wb->use = 0;
 197                 spin_unlock_irqrestore(&acm->write_lock, flags);
 198                 return rc;
 199         }
 200
 201         if (acm->susp_count) {
 202                 usb_anchor_urb(wb->urb, &acm->delayed);
 203                 spin_unlock_irqrestore(&acm->write_lock, flags);
 204                 return 0;
 205         }
 206         usb_mark_last_busy(acm->dev);
 207
 208         rc = acm_start_wb(acm, wb);
 209         spin_unlock_irqrestore(&acm->write_lock, flags);
 210
 211         return rc;
 212
 213 }
 214 /*
 215  * attributes exported through sysfs
 216  */
 217 static ssize_t show_caps
 218 (struct device *dev, struct device_attribute *attr, char *buf)
 219 {
 220         struct usb_interface *intf = to_usb_interface(dev);
 221         struct acm *acm = usb_get_intfdata(intf);
 222
 223         return sprintf(buf, "%d", acm->ctrl_caps);
 224 }
 225 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 226
 227 static ssize_t show_country_codes
 228 (struct device *dev, struct device_attribute *attr, char *buf)
 229 {
 230         struct usb_interface *intf = to_usb_interface(dev);
 231         struct acm *acm = usb_get_intfdata(intf);
 232
 233         memcpy(buf, acm->country_codes, acm->country_code_size);
 234         return acm->country_code_size;
 235 }
 236
 237 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 238
 239 static ssize_t show_country_rel_date
 240 (struct device *dev, struct device_attribute *attr, char *buf)
 241 {
 242         struct usb_interface *intf = to_usb_interface(dev);
 243         struct acm *acm = usb_get_intfdata(intf);
 244
 245         return sprintf(buf, "%d", acm->country_rel_date);
 246 }
 247
 248 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 249 /*
 250  * Interrupt handlers for various ACM device responses
 251  */
 252
 253 /* control interface reports status changes with "interrupt" transfers */
 254 static void acm_ctrl_irq(struct urb *urb)
 255 {
 256         struct acm *acm = urb->context;
 257         struct usb_cdc_notification *dr = urb->transfer_buffer;
 258         struct tty_struct *tty;
 259         unsigned char *data;
 260         int newctrl;
 261         int retval;
 262         int status = urb->status;
 263
 264         switch (status) {
 265         case 0:
 266                 /* success */
 267                 break;
 268         case -ECONNRESET:
 269         case -ENOENT:
 270         case -ESHUTDOWN:
 271                 /* this urb is terminated, clean up */
 272                 dev_dbg(&acm->control->dev,
 273                                 "%s - urb shutting down with status: %d\n",
 274                                 __func__, status);
 275                 return;
 276         default:
 277                 dev_dbg(&acm->control->dev,
 278                                 "%s - nonzero urb status received: %d\n",
 279                                 __func__, status);
 280                 goto exit;
 281         }
 282
 283         if (!ACM_READY(acm))
 284                 goto exit;
 285
 286         usb_mark_last_busy(acm->dev);
 287
 288         data = (unsigned char *)(dr + 1);
 289         switch (dr->bNotificationType) {
 290         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 291                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
 292                                                         __func__, dr->wValue);
 293                 break;
 294
 295         case USB_CDC_NOTIFY_SERIAL_STATE:
 296                 tty = tty_port_tty_get(&acm->port);
 297                 newctrl = get_unaligned_le16(data);
 298
 299                 if (tty) {
 300                         if (!acm->clocal &&
 301                                 (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 302                                 dev_dbg(&acm->control->dev,
 303                                         "%s - calling hangup\n", __func__);
 304                                 tty_hangup(tty);
 305                         }
 306                         tty_kref_put(tty);
 307                 }
 308
 309                 acm->ctrlin = newctrl;
 310
 311                 dev_dbg(&acm->control->dev,
 312                         "%s - input control lines: dcd%c dsr%c break%c "
 313                         "ring%c framing%c parity%c overrun%c\n",
 314                         __func__,
 315                         acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
 316                         acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
 317                         acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
 318                         acm->ctrlin & ACM_CTRL_RI  ? '+' : '-',
 319                         acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
 320                         acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
 321                         acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
 322                         break;
 323
 324         default:
 325                 dev_dbg(&acm->control->dev,
 326                         "%s - unknown notification %d received: index %d "
 327                         "len %d data0 %d data1 %d\n",
 328                         __func__,
 329                         dr->bNotificationType, dr->wIndex,
 330                         dr->wLength, data[0], data[1]);
 331                 break;
 332         }
 333 exit:
 334         retval = usb_submit_urb(urb, GFP_ATOMIC);
 335         if (retval)
 336                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 337                                                         __func__, retval);
 338 }
 339
 340 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 341 {
 342         int res;
 343
 344         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 345                 return 0;
 346
 347         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
 348
 349         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 350         if (res) {
 351                 if (res != -EPERM) {
 352                         dev_err(&acm->data->dev,
 353                                         "%s - usb_submit_urb failed: %d\n",
 354                                         __func__, res);
 355                 }
 356                 set_bit(index, &acm->read_urbs_free);
 357                 return res;
 358         }
 359
 360         return 0;
 361 }
 362
 363 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 364 {
 365         int res;
 366         int i;
 367
 368         for (i = 0; i < acm->rx_buflimit; ++i) {
 369                 res = acm_submit_read_urb(acm, i, mem_flags);
 370                 if (res)
 371                         return res;
 372         }
 373
 374         return 0;
 375 }
 376
 377 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 378 {
 379         struct tty_struct *tty;
 380
 381         if (!urb->actual_length)
 382                 return;
 383
 384         tty = tty_port_tty_get(&acm->port);
 385         if (!tty)
 386                 return;
 387
 388         tty_insert_flip_string(tty, urb->transfer_buffer, urb->actual_length);
 389         tty_flip_buffer_push(tty);
 390
 391         tty_kref_put(tty);
 392 }
 393
 394 static void acm_read_bulk_callback(struct urb *urb)
 395 {
 396         struct acm_rb *rb = urb->context;
 397         struct acm *acm = rb->instance;
 398         unsigned long flags;
 399
 400         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
 401                                         rb->index, urb->actual_length);
 402         set_bit(rb->index, &acm->read_urbs_free);
 403
 404         if (!acm->dev) {
 405                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 406                 return;
 407         }
 408         usb_mark_last_busy(acm->dev);
 409
 410         if (urb->status) {
 411                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
 412                                                         __func__, urb->status);
 413                 return;
 414         }
 415         acm_process_read_urb(acm, urb);
 416
 417         /* throttle device if requested by tty */
 418         spin_lock_irqsave(&acm->read_lock, flags);
 419         acm->throttled = acm->throttle_req;
 420         if (!acm->throttled && !acm->susp_count) {
 421                 spin_unlock_irqrestore(&acm->read_lock, flags);
 422                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 423         } else {
 424                 spin_unlock_irqrestore(&acm->read_lock, flags);
 425         }
 426 }
 427
 428 /* data interface wrote those outgoing bytes */
 429 static void acm_write_bulk(struct urb *urb)
 430 {
 431         struct acm_wb *wb = urb->context;
 432         struct acm *acm = wb->instance;
 433         unsigned long flags;
 434
 435         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
 436                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
 437                         __func__,
 438                         urb->actual_length,
 439                         urb->transfer_buffer_length,
 440                         urb->status);
 441
 442         spin_lock_irqsave(&acm->write_lock, flags);
 443         acm_write_done(acm, wb);
 444         spin_unlock_irqrestore(&acm->write_lock, flags);
 445         if (ACM_READY(acm))
 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         struct tty_struct *tty;
 453
 454         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 455
 456         if (!ACM_READY(acm))
 457                 return;
 458         tty = tty_port_tty_get(&acm->port);
 459         if (!tty)
 460                 return;
 461         tty_wakeup(tty);
 462         tty_kref_put(tty);
 463 }
 464
 465 /*
 466  * TTY handlers
 467  */
 468
 469 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 470 {
 471         struct acm *acm;
 472         int rv = -ENODEV;
 473
 474         mutex_lock(&open_mutex);
 475
 476         acm = acm_table[tty->index];
 477         if (!acm || !acm->dev)
 478                 goto out;
 479         else
 480                 rv = 0;
 481
 482         dev_dbg(&acm->control->dev, "%s\n", __func__);
 483
 484         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 485
 486         tty->driver_data = acm;
 487         tty_port_tty_set(&acm->port, tty);
 488
 489         if (usb_autopm_get_interface(acm->control) < 0)
 490                 goto early_bail;
 491         else
 492                 acm->control->needs_remote_wakeup = 1;
 493
 494         mutex_lock(&acm->mutex);
 495         if (acm->port.count++) {
 496                 mutex_unlock(&acm->mutex);
 497                 usb_autopm_put_interface(acm->control);
 498                 goto out;
 499         }
 500
 501         acm->ctrlurb->dev = acm->dev;
 502         if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
 503                 dev_err(&acm->control->dev,
 504                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 505                 goto bail_out;
 506         }
 507
 508         if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS) &&
 509             (acm->ctrl_caps & USB_CDC_CAP_LINE))
 510                 goto bail_out;
 511
 512         usb_autopm_put_interface(acm->control);
 513
 514         /*
 515          * Unthrottle device in case the TTY was closed while throttled.
 516          */
 517         spin_lock_irq(&acm->read_lock);
 518         acm->throttled = 0;
 519         acm->throttle_req = 0;
 520         spin_unlock_irq(&acm->read_lock);
 521
 522         if (acm_submit_read_urbs(acm, GFP_KERNEL))
 523                 goto bail_out;
 524
 525         set_bit(ASYNCB_INITIALIZED, &acm->port.flags);
 526         rv = tty_port_block_til_ready(&acm->port, tty, filp);
 527
 528         mutex_unlock(&acm->mutex);
 529 out:
 530         mutex_unlock(&open_mutex);
 531         return rv;
 532
 533 bail_out:
 534         acm->port.count--;
 535         mutex_unlock(&acm->mutex);
 536         usb_autopm_put_interface(acm->control);
 537 early_bail:
 538         mutex_unlock(&open_mutex);
 539         tty_port_tty_set(&acm->port, NULL);
 540         return -EIO;
 541 }
 542
 543 static void acm_tty_unregister(struct acm *acm)
 544 {
 545         int i;
 546
 547         tty_unregister_device(acm_tty_driver, acm->minor);
 548         usb_put_intf(acm->control);
 549         acm_table[acm->minor] = NULL;
 550         usb_free_urb(acm->ctrlurb);
 551         for (i = 0; i < ACM_NW; i++)
 552                 usb_free_urb(acm->wb[i].urb);
 553         for (i = 0; i < acm->rx_buflimit; i++)
 554                 usb_free_urb(acm->read_urbs[i]);
 555         kfree(acm->country_codes);
 556         kfree(acm);
 557 }
 558
 559 static void acm_port_down(struct acm *acm)
 560 {
 561         struct urb *urb;
 562         struct acm_wb *wb;
 563         int i;
 564
 565         if (acm->dev) {
 566                 usb_autopm_get_interface(acm->control);
 567                 acm_set_control(acm, acm->ctrlout = 0);
 568
 569                 for (;;) {
 570                         urb = usb_get_from_anchor(&acm->delayed);
 571                         if (!urb)
 572                                 break;
 573                         wb = urb->context;
 574                         wb->use = 0;
 575                         usb_autopm_put_interface_async(acm->control);
 576                 }
 577
 578                 usb_kill_urb(acm->ctrlurb);
 579                 for (i = 0; i < ACM_NW; i++)
 580                         usb_kill_urb(acm->wb[i].urb);
 581                 for (i = 0; i < acm->rx_buflimit; i++)
 582                         usb_kill_urb(acm->read_urbs[i]);
 583                 acm->control->needs_remote_wakeup = 0;
 584                 usb_autopm_put_interface(acm->control);
 585         }
 586 }
 587
 588 static void acm_tty_hangup(struct tty_struct *tty)
 589 {
 590         struct acm *acm;
 591
 592         mutex_lock(&open_mutex);
 593         acm = tty->driver_data;
 594
 595         if (!acm)
 596                 goto out;
 597
 598         tty_port_hangup(&acm->port);
 599         acm_port_down(acm);
 600
 601 out:
 602         mutex_unlock(&open_mutex);
 603 }
 604
 605 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 606 {
 607         struct acm *acm = tty->driver_data;
 608
 609         /* Perform the closing process and see if we need to do the hardware
 610            shutdown */
 611         if (!acm)
 612                 return;
 613
 614         mutex_lock(&open_mutex);
 615         if (tty_port_close_start(&acm->port, tty, filp) == 0) {
 616                 if (!acm->dev) {
 617                         tty_port_tty_set(&acm->port, NULL);
 618                         acm_tty_unregister(acm);
 619                         tty->driver_data = NULL;
 620                 }
 621                 mutex_unlock(&open_mutex);
 622                 return;
 623         }
 624         acm_port_down(acm);
 625         tty_port_close_end(&acm->port, tty);
 626         tty_port_tty_set(&acm->port, NULL);
 627         mutex_unlock(&open_mutex);
 628 }
 629
 630 static int acm_tty_write(struct tty_struct *tty,
 631                                         const unsigned char *buf, int count)
 632 {
 633         struct acm *acm = tty->driver_data;
 634         int stat;
 635         unsigned long flags;
 636         int wbn;
 637         struct acm_wb *wb;
 638
 639         if (!ACM_READY(acm))
 640                 return -EINVAL;
 641         if (!count)
 642                 return 0;
 643
 644         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 645
 646         spin_lock_irqsave(&acm->write_lock, flags);
 647         wbn = acm_wb_alloc(acm);
 648         if (wbn < 0) {
 649                 spin_unlock_irqrestore(&acm->write_lock, flags);
 650                 return 0;
 651         }
 652         wb = &acm->wb[wbn];
 653
 654         count = (count > acm->writesize) ? acm->writesize : count;
 655         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 656         memcpy(wb->buf, buf, count);
 657         wb->len = count;
 658         spin_unlock_irqrestore(&acm->write_lock, flags);
 659
 660         stat = acm_write_start(acm, wbn);
 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         if (!ACM_READY(acm))
 670                 return -EINVAL;
 671         /*
 672          * Do not let the line discipline to know that we have a reserve,
 673          * or it might get too enthusiastic.
 674          */
 675         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 676 }
 677
 678 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 679 {
 680         struct acm *acm = tty->driver_data;
 681         if (!ACM_READY(acm))
 682                 return 0;
 683         /*
 684          * This is inaccurate (overcounts), but it works.
 685          */
 686         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 687 }
 688
 689 static void acm_tty_throttle(struct tty_struct *tty)
 690 {
 691         struct acm *acm = tty->driver_data;
 692
 693         if (!ACM_READY(acm))
 694                 return;
 695
 696         spin_lock_irq(&acm->read_lock);
 697         acm->throttle_req = 1;
 698         spin_unlock_irq(&acm->read_lock);
 699 }
 700
 701 static void acm_tty_unthrottle(struct tty_struct *tty)
 702 {
 703         struct acm *acm = tty->driver_data;
 704         unsigned int was_throttled;
 705
 706         if (!ACM_READY(acm))
 707                 return;
 708
 709         spin_lock_irq(&acm->read_lock);
 710         was_throttled = acm->throttled;
 711         acm->throttled = 0;
 712         acm->throttle_req = 0;
 713         spin_unlock_irq(&acm->read_lock);
 714
 715         if (was_throttled)
 716                 acm_submit_read_urbs(acm, GFP_KERNEL);
 717 }
 718
 719 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 720 {
 721         struct acm *acm = tty->driver_data;
 722         int retval;
 723         if (!ACM_READY(acm))
 724                 return -EINVAL;
 725         retval = acm_send_break(acm, state ? 0xffff : 0);
 726         if (retval < 0)
 727                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 728                                                                 __func__);
 729         return retval;
 730 }
 731
 732 static int acm_tty_tiocmget(struct tty_struct *tty)
 733 {
 734         struct acm *acm = tty->driver_data;
 735
 736         if (!ACM_READY(acm))
 737                 return -EINVAL;
 738
 739         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 740                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 741                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 742                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 743                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 744                TIOCM_CTS;
 745 }
 746
 747 static int acm_tty_tiocmset(struct tty_struct *tty,
 748                             unsigned int set, unsigned int clear)
 749 {
 750         struct acm *acm = tty->driver_data;
 751         unsigned int newctrl;
 752
 753         if (!ACM_READY(acm))
 754                 return -EINVAL;
 755
 756         newctrl = acm->ctrlout;
 757         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 758                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 759         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 760                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 761
 762         newctrl = (newctrl & ~clear) | set;
 763
 764         if (acm->ctrlout == newctrl)
 765                 return 0;
 766         return acm_set_control(acm, acm->ctrlout = newctrl);
 767 }
 768
 769 static int acm_tty_ioctl(struct tty_struct *tty,
 770                                         unsigned int cmd, unsigned long arg)
 771 {
 772         struct acm *acm = tty->driver_data;
 773
 774         if (!ACM_READY(acm))
 775                 return -EINVAL;
 776
 777         return -ENOIOCTLCMD;
 778 }
 779
 780 static const __u32 acm_tty_speed[] = {
 781         0, 50, 75, 110, 134, 150, 200, 300, 600,
 782         1200, 1800, 2400, 4800, 9600, 19200, 38400,
 783         57600, 115200, 230400, 460800, 500000, 576000,
 784         921600, 1000000, 1152000, 1500000, 2000000,
 785         2500000, 3000000, 3500000, 4000000
 786 };
 787
 788 static void acm_tty_set_termios(struct tty_struct *tty,
 789                                                 struct ktermios *termios_old)
 790 {
 791         struct acm *acm = tty->driver_data;
 792         struct ktermios *termios = tty->termios;
 793         struct usb_cdc_line_coding newline;
 794         int newctrl = acm->ctrlout;
 795
 796         if (!ACM_READY(acm))
 797                 return;
 798
 799         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 800         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 801         newline.bParityType = termios->c_cflag & PARENB ?
 802                                 (termios->c_cflag & PARODD ? 1 : 2) +
 803                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 804         switch (termios->c_cflag & CSIZE) {
 805         case CS5:
 806                 newline.bDataBits = 5;
 807                 break;
 808         case CS6:
 809                 newline.bDataBits = 6;
 810                 break;
 811         case CS7:
 812                 newline.bDataBits = 7;
 813                 break;
 814         case CS8:
 815         default:
 816                 newline.bDataBits = 8;
 817                 break;
 818         }
 819         /* FIXME: Needs to clear unsupported bits in the termios */
 820         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 821
 822         if (!newline.dwDTERate) {
 823                 newline.dwDTERate = acm->line.dwDTERate;
 824                 newctrl &= ~ACM_CTRL_DTR;
 825         } else
 826                 newctrl |=  ACM_CTRL_DTR;
 827
 828         if (newctrl != acm->ctrlout)
 829                 acm_set_control(acm, acm->ctrlout = newctrl);
 830
 831         if (memcmp(&acm->line, &newline, sizeof newline)) {
 832                 memcpy(&acm->line, &newline, sizeof newline);
 833                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 834                         __func__,
 835                         le32_to_cpu(newline.dwDTERate),
 836                         newline.bCharFormat, newline.bParityType,
 837                         newline.bDataBits);
 838                 acm_set_line(acm, &acm->line);
 839         }
 840 }
 841
 842 /*
 843  * USB probe and disconnect routines.
 844  */
 845
 846 /* Little helpers: write/read buffers free */
 847 static void acm_write_buffers_free(struct acm *acm)
 848 {
 849         int i;
 850         struct acm_wb *wb;
 851         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 852
 853         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
 854                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
 855 }
 856
 857 static void acm_read_buffers_free(struct acm *acm)
 858 {
 859         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 860         int i;
 861
 862         for (i = 0; i < acm->rx_buflimit; i++)
 863                 usb_free_coherent(usb_dev, acm->readsize,
 864                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
 865 }
 866
 867 /* Little helper: write buffers allocate */
 868 static int acm_write_buffers_alloc(struct acm *acm)
 869 {
 870         int i;
 871         struct acm_wb *wb;
 872
 873         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
 874                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
 875                     &wb->dmah);
 876                 if (!wb->buf) {
 877                         while (i != 0) {
 878                                 --i;
 879                                 --wb;
 880                                 usb_free_coherent(acm->dev, acm->writesize,
 881                                     wb->buf, wb->dmah);
 882                         }
 883                         return -ENOMEM;
 884                 }
 885         }
 886         return 0;
 887 }
 888
 889 static int acm_probe(struct usb_interface *intf,
 890                      const struct usb_device_id *id)
 891 {
 892         struct usb_cdc_union_desc *union_header = NULL;
 893         struct usb_cdc_country_functional_desc *cfd = NULL;
 894         unsigned char *buffer = intf->altsetting->extra;
 895         int buflen = intf->altsetting->extralen;
 896         struct usb_interface *control_interface;
 897         struct usb_interface *data_interface;
 898         struct usb_endpoint_descriptor *epctrl = NULL;
 899         struct usb_endpoint_descriptor *epread = NULL;
 900         struct usb_endpoint_descriptor *epwrite = NULL;
 901         struct usb_device *usb_dev = interface_to_usbdev(intf);
 902         struct acm *acm;
 903         int minor;
 904         int ctrlsize, readsize;
 905         u8 *buf;
 906         u8 ac_management_function = 0;
 907         u8 call_management_function = 0;
 908         int call_interface_num = -1;
 909         int data_interface_num = -1;
 910         unsigned long quirks;
 911         int num_rx_buf;
 912         int i;
 913         int combined_interfaces = 0;
 914
 915         /* normal quirks */
 916         quirks = (unsigned long)id->driver_info;
 917         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
 918
 919         /* handle quirks deadly to normal probing*/
 920         if (quirks == NO_UNION_NORMAL) {
 921                 data_interface = usb_ifnum_to_if(usb_dev, 1);
 922                 control_interface = usb_ifnum_to_if(usb_dev, 0);
 923                 goto skip_normal_probe;
 924         }
 925
 926         /* normal probing*/
 927         if (!buffer) {
 928                 dev_err(&intf->dev, "Weird descriptor references\n");
 929                 return -EINVAL;
 930         }
 931
 932         if (!buflen) {
 933                 if (intf->cur_altsetting->endpoint &&
 934                                 intf->cur_altsetting->endpoint->extralen &&
 935                                 intf->cur_altsetting->endpoint->extra) {
 936                         dev_dbg(&intf->dev,
 937                                 "Seeking extra descriptors on endpoint\n");
 938                         buflen = intf->cur_altsetting->endpoint->extralen;
 939                         buffer = intf->cur_altsetting->endpoint->extra;
 940                 } else {
 941                         dev_err(&intf->dev,
 942                                 "Zero length descriptor references\n");
 943                         return -EINVAL;
 944                 }
 945         }
 946
 947         while (buflen > 0) {
 948                 if (buffer[1] != USB_DT_CS_INTERFACE) {
 949                         dev_err(&intf->dev, "skipping garbage\n");
 950                         goto next_desc;
 951                 }
 952
 953                 switch (buffer[2]) {
 954                 case USB_CDC_UNION_TYPE: /* we've found it */
 955                         if (union_header) {
 956                                 dev_err(&intf->dev, "More than one "
 957                                         "union descriptor, skipping ...\n");
 958                                 goto next_desc;
 959                         }
 960                         union_header = (struct usb_cdc_union_desc *)buffer;
 961                         break;
 962                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
 963                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
 964                         break;
 965                 case USB_CDC_HEADER_TYPE: /* maybe check version */
 966                         break; /* for now we ignore it */
 967                 case USB_CDC_ACM_TYPE:
 968                         ac_management_function = buffer[3];
 969                         break;
 970                 case USB_CDC_CALL_MANAGEMENT_TYPE:
 971                         call_management_function = buffer[3];
 972                         call_interface_num = buffer[4];
 973                         if ( (quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
 974                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
 975                         break;
 976                 default:
 977                         /* there are LOTS more CDC descriptors that
 978                          * could legitimately be found here.
 979                          */
 980                         dev_dbg(&intf->dev, "Ignoring descriptor: "
 981                                         "type %02x, length %d\n",
 982                                         buffer[2], buffer[0]);
 983                         break;
 984                 }
 985 next_desc:
 986                 buflen -= buffer[0];
 987                 buffer += buffer[0];
 988         }
 989
 990         if (!union_header) {
 991                 if (call_interface_num > 0) {
 992                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
 993                         /* quirks for Droids MuIn LCD */
 994                         if (quirks & NO_DATA_INTERFACE)
 995                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
 996                         else
 997                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
 998                         control_interface = intf;
 999                 } else {
1000                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1001                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1002                                 return -ENODEV;
1003                         } else {
1004                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1005                                 combined_interfaces = 1;
1006                                 control_interface = data_interface = intf;
1007                                 goto look_for_collapsed_interface;
1008                         }
1009                 }
1010         } else {
1011                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1012                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1013                 if (!control_interface || !data_interface) {
1014                         dev_dbg(&intf->dev, "no interfaces\n");
1015                         return -ENODEV;
1016                 }
1017         }
1018
1019         if (data_interface_num != call_interface_num)
1020                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1021
1022         if (control_interface == data_interface) {
1023                 /* some broken devices designed for windows work this way */
1024                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1025                 combined_interfaces = 1;
1026                 /* a popular other OS doesn't use it */
1027                 quirks |= NO_CAP_LINE;
1028                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1029                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1030                         return -EINVAL;
1031                 }
1032 look_for_collapsed_interface:
1033                 for (i = 0; i < 3; i++) {
1034                         struct usb_endpoint_descriptor *ep;
1035                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1036
1037                         if (usb_endpoint_is_int_in(ep))
1038                                 epctrl = ep;
1039                         else if (usb_endpoint_is_bulk_out(ep))
1040                                 epwrite = ep;
1041                         else if (usb_endpoint_is_bulk_in(ep))
1042                                 epread = ep;
1043                         else
1044                                 return -EINVAL;
1045                 }
1046                 if (!epctrl || !epread || !epwrite)
1047                         return -ENODEV;
1048                 else
1049                         goto made_compressed_probe;
1050         }
1051
1052 skip_normal_probe:
1053
1054         /*workaround for switched interfaces */
1055         if (data_interface->cur_altsetting->desc.bInterfaceClass
1056                                                 != CDC_DATA_INTERFACE_TYPE) {
1057                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1058                                                 == CDC_DATA_INTERFACE_TYPE) {
1059                         struct usb_interface *t;
1060                         dev_dbg(&intf->dev,
1061                                 "Your device has switched interfaces.\n");
1062                         t = control_interface;
1063                         control_interface = data_interface;
1064                         data_interface = t;
1065                 } else {
1066                         return -EINVAL;
1067                 }
1068         }
1069
1070         /* Accept probe requests only for the control interface */
1071         if (!combined_interfaces && intf != control_interface)
1072                 return -ENODEV;
1073
1074         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1075                 /* valid in this context */
1076                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1077                 return -EBUSY;
1078         }
1079
1080
1081         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1082             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1083                 return -EINVAL;
1084
1085         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1086         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1087         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1088
1089
1090         /* workaround for switched endpoints */
1091         if (!usb_endpoint_dir_in(epread)) {
1092                 /* descriptors are swapped */
1093                 struct usb_endpoint_descriptor *t;
1094                 dev_dbg(&intf->dev,
1095                         "The data interface has switched endpoints\n");
1096                 t = epread;
1097                 epread = epwrite;
1098                 epwrite = t;
1099         }
1100 made_compressed_probe:
1101         dev_dbg(&intf->dev, "interfaces are valid\n");
1102         for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++);
1103
1104         if (minor == ACM_TTY_MINORS) {
1105                 dev_err(&intf->dev, "no more free acm devices\n");
1106                 return -ENODEV;
1107         }
1108
1109         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1110         if (acm == NULL) {
1111                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1112                 goto alloc_fail;
1113         }
1114
1115         ctrlsize = usb_endpoint_maxp(epctrl);
1116         readsize = usb_endpoint_maxp(epread) *
1117                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1118         acm->combined_interfaces = combined_interfaces;
1119         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1120         acm->control = control_interface;
1121         acm->data = data_interface;
1122         acm->minor = minor;
1123         acm->dev = usb_dev;
1124         acm->ctrl_caps = ac_management_function;
1125         if (quirks & NO_CAP_LINE)
1126                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1127         acm->ctrlsize = ctrlsize;
1128         acm->readsize = readsize;
1129         acm->rx_buflimit = num_rx_buf;
1130         INIT_WORK(&acm->work, acm_softint);
1131         spin_lock_init(&acm->write_lock);
1132         spin_lock_init(&acm->read_lock);
1133         mutex_init(&acm->mutex);
1134         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1135         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1136         if (acm->is_int_ep)
1137                 acm->bInterval = epread->bInterval;
1138         tty_port_init(&acm->port);
1139         acm->port.ops = &acm_port_ops;
1140         init_usb_anchor(&acm->delayed);
1141
1142         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1143         if (!buf) {
1144                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1145                 goto alloc_fail2;
1146         }
1147         acm->ctrl_buffer = buf;
1148
1149         if (acm_write_buffers_alloc(acm) < 0) {
1150                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1151                 goto alloc_fail4;
1152         }
1153
1154         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1155         if (!acm->ctrlurb) {
1156                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1157                 goto alloc_fail5;
1158         }
1159         for (i = 0; i < num_rx_buf; i++) {
1160                 struct acm_rb *rb = &(acm->read_buffers[i]);
1161                 struct urb *urb;
1162
1163                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1164                                                                 &rb->dma);
1165                 if (!rb->base) {
1166                         dev_err(&intf->dev, "out of memory "
1167                                         "(read bufs usb_alloc_coherent)\n");
1168                         goto alloc_fail6;
1169                 }
1170                 rb->index = i;
1171                 rb->instance = acm;
1172
1173                 urb = usb_alloc_urb(0, GFP_KERNEL);
1174                 if (!urb) {
1175                         dev_err(&intf->dev,
1176                                 "out of memory (read urbs usb_alloc_urb)\n");
1177                         goto alloc_fail6;
1178                 }
1179                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1180                 urb->transfer_dma = rb->dma;
1181                 if (acm->is_int_ep) {
1182                         usb_fill_int_urb(urb, acm->dev,
1183                                          acm->rx_endpoint,
1184                                          rb->base,
1185                                          acm->readsize,
1186                                          acm_read_bulk_callback, rb,
1187                                          acm->bInterval);
1188                 } else {
1189                         usb_fill_bulk_urb(urb, acm->dev,
1190                                           acm->rx_endpoint,
1191                                           rb->base,
1192                                           acm->readsize,
1193                                           acm_read_bulk_callback, rb);
1194                 }
1195
1196                 acm->read_urbs[i] = urb;
1197                 __set_bit(i, &acm->read_urbs_free);
1198         }
1199         for (i = 0; i < ACM_NW; i++) {
1200                 struct acm_wb *snd = &(acm->wb[i]);
1201
1202                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1203                 if (snd->urb == NULL) {
1204                         dev_err(&intf->dev,
1205                                 "out of memory (write urbs usb_alloc_urb)\n");
1206                         goto alloc_fail7;
1207                 }
1208
1209                 if (usb_endpoint_xfer_int(epwrite))
1210                         usb_fill_int_urb(snd->urb, usb_dev,
1211                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1212                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1213                 else
1214                         usb_fill_bulk_urb(snd->urb, usb_dev,
1215                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1216                                 NULL, acm->writesize, acm_write_bulk, snd);
1217                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1218                 snd->instance = acm;
1219         }
1220
1221         usb_set_intfdata(intf, acm);
1222
1223         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1224         if (i < 0)
1225                 goto alloc_fail7;
1226
1227         if (cfd) { /* export the country data */
1228                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1229                 if (!acm->country_codes)
1230                         goto skip_countries;
1231                 acm->country_code_size = cfd->bLength - 4;
1232                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1233                                                         cfd->bLength - 4);
1234                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1235
1236                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1237                 if (i < 0) {
1238                         kfree(acm->country_codes);
1239                         acm->country_codes = NULL;
1240                         acm->country_code_size = 0;
1241                         goto skip_countries;
1242                 }
1243
1244                 i = device_create_file(&intf->dev,
1245                                                 &dev_attr_iCountryCodeRelDate);
1246                 if (i < 0) {
1247                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1248                         kfree(acm->country_codes);
1249                         acm->country_codes = NULL;
1250                         acm->country_code_size = 0;
1251                         goto skip_countries;
1252                 }
1253         }
1254
1255 skip_countries:
1256         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1257                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1258                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1259                          /* works around buggy devices */
1260                          epctrl->bInterval ? epctrl->bInterval : 0xff);
1261         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1262         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1263
1264         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1265
1266         acm_set_control(acm, acm->ctrlout);
1267
1268         acm->line.dwDTERate = cpu_to_le32(9600);
1269         acm->line.bDataBits = 8;
1270         acm_set_line(acm, &acm->line);
1271
1272         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1273         usb_set_intfdata(data_interface, acm);
1274
1275         usb_get_intf(control_interface);
1276         tty_register_device(acm_tty_driver, minor, &control_interface->dev);
1277
1278         acm_table[minor] = acm;
1279
1280         return 0;
1281 alloc_fail7:
1282         for (i = 0; i < ACM_NW; i++)
1283                 usb_free_urb(acm->wb[i].urb);
1284 alloc_fail6:
1285         for (i = 0; i < num_rx_buf; i++)
1286                 usb_free_urb(acm->read_urbs[i]);
1287         acm_read_buffers_free(acm);
1288         usb_free_urb(acm->ctrlurb);
1289 alloc_fail5:
1290         acm_write_buffers_free(acm);
1291 alloc_fail4:
1292         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1293 alloc_fail2:
1294         kfree(acm);
1295 alloc_fail:
1296         return -ENOMEM;
1297 }
1298
1299 static void stop_data_traffic(struct acm *acm)
1300 {
1301         int i;
1302
1303         dev_dbg(&acm->control->dev, "%s\n", __func__);
1304
1305         usb_kill_urb(acm->ctrlurb);
1306         for (i = 0; i < ACM_NW; i++)
1307                 usb_kill_urb(acm->wb[i].urb);
1308         for (i = 0; i < acm->rx_buflimit; i++)
1309                 usb_kill_urb(acm->read_urbs[i]);
1310
1311         cancel_work_sync(&acm->work);
1312 }
1313
1314 static void acm_disconnect(struct usb_interface *intf)
1315 {
1316         struct acm *acm = usb_get_intfdata(intf);
1317         struct usb_device *usb_dev = interface_to_usbdev(intf);
1318         struct tty_struct *tty;
1319
1320         /* sibling interface is already cleaning up */
1321         if (!acm)
1322                 return;
1323
1324         mutex_lock(&open_mutex);
1325         if (acm->country_codes) {
1326                 device_remove_file(&acm->control->dev,
1327                                 &dev_attr_wCountryCodes);
1328                 device_remove_file(&acm->control->dev,
1329                                 &dev_attr_iCountryCodeRelDate);
1330         }
1331         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1332         acm->dev = NULL;
1333         usb_set_intfdata(acm->control, NULL);
1334         usb_set_intfdata(acm->data, NULL);
1335
1336         stop_data_traffic(acm);
1337
1338         acm_write_buffers_free(acm);
1339         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer,
1340                           acm->ctrl_dma);
1341         acm_read_buffers_free(acm);
1342
1343         if (!acm->combined_interfaces)
1344                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1345                                         acm->data : acm->control);
1346
1347         if (acm->port.count == 0) {
1348                 acm_tty_unregister(acm);
1349                 mutex_unlock(&open_mutex);
1350                 return;
1351         }
1352
1353         mutex_unlock(&open_mutex);
1354         tty = tty_port_tty_get(&acm->port);
1355         if (tty) {
1356                 tty_hangup(tty);
1357                 tty_kref_put(tty);
1358         }
1359 }
1360
1361 #ifdef CONFIG_PM
1362 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1363 {
1364         struct acm *acm = usb_get_intfdata(intf);
1365         int cnt;
1366
1367         spin_lock_irq(&acm->read_lock);
1368         spin_lock(&acm->write_lock);
1369         if (PMSG_IS_AUTO(message)) {
1370                 if (acm->transmitting) {
1371                         spin_unlock(&acm->write_lock);
1372                         spin_unlock_irq(&acm->read_lock);
1373                         return -EBUSY;
1374                 }
1375         }
1376         cnt = acm->susp_count++;
1377         spin_unlock(&acm->write_lock);
1378         spin_unlock_irq(&acm->read_lock);
1379
1380         if (cnt)
1381                 return 0;
1382         /*
1383         we treat opened interfaces differently,
1384         we must guard against open
1385         */
1386         mutex_lock(&acm->mutex);
1387
1388         if (acm->port.count)
1389                 stop_data_traffic(acm);
1390
1391         mutex_unlock(&acm->mutex);
1392         return 0;
1393 }
1394
1395 static int acm_resume(struct usb_interface *intf)
1396 {
1397         struct acm *acm = usb_get_intfdata(intf);
1398         struct urb *urb;
1399         int rv = 0;
1400
1401         mutex_lock(&acm->mutex);
1402         spin_lock_irq(&acm->read_lock);
1403         spin_lock(&acm->write_lock);
1404
1405         if (--acm->susp_count)
1406                 goto out;
1407
1408         if (acm->port.count) {
1409                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1410
1411                 for (;;) {
1412                         urb = usb_get_from_anchor(&acm->delayed);
1413                         if (!urb)
1414                                 break;
1415
1416                         acm_start_wb(acm, urb->context);
1417                 }
1418
1419                 /*
1420                  * delayed error checking because we must
1421                  * do the write path at all cost
1422                  */
1423                 if (rv < 0)
1424                         goto out;
1425
1426                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1427         }
1428 out:
1429         spin_unlock(&acm->write_lock);
1430         spin_unlock_irq(&acm->read_lock);
1431         mutex_unlock(&acm->mutex);
1432
1433         return rv;
1434 }
1435
1436 static int acm_reset_resume(struct usb_interface *intf)
1437 {
1438         struct acm *acm = usb_get_intfdata(intf);
1439         struct tty_struct *tty;
1440
1441         mutex_lock(&acm->mutex);
1442         if (acm->port.count) {
1443                 tty = tty_port_tty_get(&acm->port);
1444                 if (tty) {
1445                         tty_hangup(tty);
1446                         tty_kref_put(tty);
1447                 }
1448         }
1449         mutex_unlock(&acm->mutex);
1450         return acm_resume(intf);
1451 }
1452
1453 #endif /* CONFIG_PM */
1454
1455 #define NOKIA_PCSUITE_ACM_INFO(x) \
1456                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1457                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1458                 USB_CDC_ACM_PROTO_VENDOR)
1459
1460 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1461                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1462                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1463                 USB_CDC_ACM_PROTO_VENDOR)
1464
1465 /*
1466  * USB driver structure.
1467  */
1468
1469 static const struct usb_device_id acm_ids[] = {
1470         /* quirky and broken devices */
1471         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1472         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1473         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1474         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1475         },
1476         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1477         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1478         },
1479         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1480         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1481         },
1482         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1483         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1484         },
1485         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1486         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1487         },
1488         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1489         .driver_info = SINGLE_RX_URB,
1490         },
1491         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1492         .driver_info = SINGLE_RX_URB, /* firmware bug */
1493         },
1494         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1495         .driver_info = SINGLE_RX_URB, /* firmware bug */
1496         },
1497         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1498         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1499         },
1500         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1501         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1502         },
1503         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1504         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1505         },
1506         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1507         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1508         },
1509         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1510         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1511         },
1512         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1513         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1514         },
1515         /* Motorola H24 HSPA module: */
1516         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1517         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1518         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1519         },
1520         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1521         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1522         },
1523         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1524         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1525         },
1526         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1527         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1528         },
1529         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1530         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1531         },
1532         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1533         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1534         },
1535         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1536         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1537         },
1538
1539         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1540         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1541                                            data interface instead of
1542                                            communications interface.
1543                                            Maybe we should define a new
1544                                            quirk for this. */
1545         },
1546         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1547         .driver_info = NO_UNION_NORMAL,
1548         },
1549         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1550         .driver_info = NO_UNION_NORMAL,
1551         },
1552         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1553         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1554         },
1555         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1556         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1557         },
1558
1559         /* Nokia S60 phones expose two ACM channels. The first is
1560          * a modem and is picked up by the standard AT-command
1561          * information below. The second is 'vendor-specific' but
1562          * is treated as a serial device at the S60 end, so we want
1563          * to expose it on Linux too. */
1564         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1565         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1566         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1567         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1568         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1569         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1570         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1571         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1572         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1573         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1574         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1575         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1576         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1577         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1578         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1579         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1580         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1581         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1582         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1583         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1584         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1585         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1586         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1587         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1588         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1589         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1590         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1591         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1592         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1593         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1594         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1595         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1596         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1597         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1598         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1599         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1600         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1601         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1602         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1603         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1604         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1605         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1606         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1607         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1608         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1609         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1610         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1611         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1612         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1613         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1614         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1615         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1616         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1617         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1618         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1619         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1620         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1621         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1622
1623         /* Support for Owen devices */
1624         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1625
1626         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1627
1628         /* Support Lego NXT using pbLua firmware */
1629         { USB_DEVICE(0x0694, 0xff00),
1630         .driver_info = NOT_A_MODEM,
1631         },
1632
1633         /* Support for Droids MuIn LCD */
1634         { USB_DEVICE(0x04d8, 0x000b),
1635         .driver_info = NO_DATA_INTERFACE,
1636         },
1637
1638         /* control interfaces without any protocol set */
1639         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1640                 USB_CDC_PROTO_NONE) },
1641
1642         /* control interfaces with various AT-command sets */
1643         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1644                 USB_CDC_ACM_PROTO_AT_V25TER) },
1645         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1646                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1647         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1648                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1649         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1650                 USB_CDC_ACM_PROTO_AT_GSM) },
1651         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1652                 USB_CDC_ACM_PROTO_AT_3G) },
1653         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1654                 USB_CDC_ACM_PROTO_AT_CDMA) },
1655
1656         { }
1657 };
1658
1659 MODULE_DEVICE_TABLE(usb, acm_ids);
1660
1661 static struct usb_driver acm_driver = {
1662         .name =         "cdc_acm",
1663         .probe =        acm_probe,
1664         .disconnect =   acm_disconnect,
1665 #ifdef CONFIG_PM
1666         .suspend =      acm_suspend,
1667         .resume =       acm_resume,
1668         .reset_resume = acm_reset_resume,
1669 #endif
1670         .id_table =     acm_ids,
1671 #ifdef CONFIG_PM
1672         .supports_autosuspend = 1,
1673 #endif
1674 };
1675
1676 /*
1677  * TTY driver structures.
1678  */
1679
1680 static const struct tty_operations acm_ops = {
1681         .open =                 acm_tty_open,
1682         .close =                acm_tty_close,
1683         .hangup =               acm_tty_hangup,
1684         .write =                acm_tty_write,
1685         .write_room =           acm_tty_write_room,
1686         .ioctl =                acm_tty_ioctl,
1687         .throttle =             acm_tty_throttle,
1688         .unthrottle =           acm_tty_unthrottle,
1689         .chars_in_buffer =      acm_tty_chars_in_buffer,
1690         .break_ctl =            acm_tty_break_ctl,
1691         .set_termios =          acm_tty_set_termios,
1692         .tiocmget =             acm_tty_tiocmget,
1693         .tiocmset =             acm_tty_tiocmset,
1694 };
1695
1696 /*
1697  * Init / exit.
1698  */
1699
1700 static int __init acm_init(void)
1701 {
1702         int retval;
1703         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1704         if (!acm_tty_driver)
1705                 return -ENOMEM;
1706         acm_tty_driver->owner = THIS_MODULE,
1707         acm_tty_driver->driver_name = "acm",
1708         acm_tty_driver->name = "ttyACM",
1709         acm_tty_driver->major = ACM_TTY_MAJOR,
1710         acm_tty_driver->minor_start = 0,
1711         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1712         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1713         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1714         acm_tty_driver->init_termios = tty_std_termios;
1715         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1716                                                                 HUPCL | CLOCAL;
1717         tty_set_operations(acm_tty_driver, &acm_ops);
1718
1719         retval = tty_register_driver(acm_tty_driver);
1720         if (retval) {
1721                 put_tty_driver(acm_tty_driver);
1722                 return retval;
1723         }
1724
1725         retval = usb_register(&acm_driver);
1726         if (retval) {
1727                 tty_unregister_driver(acm_tty_driver);
1728                 put_tty_driver(acm_tty_driver);
1729                 return retval;
1730         }
1731
1732         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1733
1734         return 0;
1735 }
1736
1737 static void __exit acm_exit(void)
1738 {
1739         usb_deregister(&acm_driver);
1740         tty_unregister_driver(acm_tty_driver);
1741         put_tty_driver(acm_tty_driver);
1742 }
1743
1744 module_init(acm_init);
1745 module_exit(acm_exit);
1746
1747 MODULE_AUTHOR(DRIVER_AUTHOR);
1748 MODULE_DESCRIPTION(DRIVER_DESC);
1749 MODULE_LICENSE("GPL");
1750 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);