drivers/usb/class/cdc-acm.c

   1 /*
   2  * cdc-acm.c
   3  *
   4  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
   5  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
   6  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
   7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   8  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
   9  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
  10  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
  11  *
  12  * USB Abstract Control Model driver for USB modems and ISDN adapters
  13  *
  14  * Sponsored by SuSE
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  29  */
  30
  31 #undef DEBUG
  32 #undef VERBOSE_DEBUG
  33
  34 #include <linux/kernel.h>
  35 #include <linux/errno.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/tty.h>
  39 #include <linux/serial.h>
  40 #include <linux/tty_driver.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/module.h>
  43 #include <linux/mutex.h>
  44 #include <linux/uaccess.h>
  45 #include <linux/usb.h>
  46 #include <linux/usb/cdc.h>
  47 #include <asm/byteorder.h>
  48 #include <asm/unaligned.h>
  49 #include <linux/list.h>
  50
  51 #include "cdc-acm.h"
  52
  53
  54 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  55 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  56
  57 static struct usb_driver acm_driver;
  58 static struct tty_driver *acm_tty_driver;
  59 static struct acm *acm_table[ACM_TTY_MINORS];
  60
  61 static DEFINE_MUTEX(acm_table_lock);
  62
  63 /*
  64  * acm_table accessors
  65  */
  66
  67 /*
  68  * Look up an ACM structure by index. If found and not disconnected, increment
  69  * its refcount and return it with its mutex held.
  70  */
  71 static struct acm *acm_get_by_index(unsigned index)
  72 {
  73         struct acm *acm;
  74
  75         mutex_lock(&acm_table_lock);
  76         acm = acm_table[index];
  77         if (acm) {
  78                 mutex_lock(&acm->mutex);
  79                 if (acm->disconnected) {
  80                         mutex_unlock(&acm->mutex);
  81                         acm = NULL;
  82                 } else {
  83                         tty_port_get(&acm->port);
  84                         mutex_unlock(&acm->mutex);
  85                 }
  86         }
  87         mutex_unlock(&acm_table_lock);
  88         return acm;
  89 }
  90
  91 /*
  92  * Try to find an available minor number and if found, associate it with 'acm'.
  93  */
  94 static int acm_alloc_minor(struct acm *acm)
  95 {
  96         int minor;
  97
  98         mutex_lock(&acm_table_lock);
  99         for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
 100                 if (!acm_table[minor]) {
 101                         acm_table[minor] = acm;
 102                         break;
 103                 }
 104         }
 105         mutex_unlock(&acm_table_lock);
 106
 107         return minor;
 108 }
 109
 110 /* Release the minor number associated with 'acm'.  */
 111 static void acm_release_minor(struct acm *acm)
 112 {
 113         mutex_lock(&acm_table_lock);
 114         acm_table[acm->minor] = NULL;
 115         mutex_unlock(&acm_table_lock);
 116 }
 117
 118 /*
 119  * Functions for ACM control messages.
 120  */
 121
 122 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 123                                                         void *buf, int len)
 124 {
 125         int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 126                 request, USB_RT_ACM, value,
 127                 acm->control->altsetting[0].desc.bInterfaceNumber,
 128                 buf, len, 5000);
 129         dev_dbg(&acm->control->dev,
 130                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 131                         __func__, request, value, len, retval);
 132         return retval < 0 ? retval : 0;
 133 }
 134
 135 /* devices aren't required to support these requests.
 136  * the cdc acm descriptor tells whether they do...
 137  */
 138 #define acm_set_control(acm, control) \
 139         acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
 140 #define acm_set_line(acm, line) \
 141         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 142 #define acm_send_break(acm, ms) \
 143         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 144
 145 /*
 146  * Write buffer management.
 147  * All of these assume proper locks taken by the caller.
 148  */
 149
 150 static int acm_wb_alloc(struct acm *acm)
 151 {
 152         int i, wbn;
 153         struct acm_wb *wb;
 154
 155         wbn = 0;
 156         i = 0;
 157         for (;;) {
 158                 wb = &acm->wb[wbn];
 159                 if (!wb->use) {
 160                         wb->use = 1;
 161                         return wbn;
 162                 }
 163                 wbn = (wbn + 1) % ACM_NW;
 164                 if (++i >= ACM_NW)
 165                         return -1;
 166         }
 167 }
 168
 169 static int acm_wb_is_avail(struct acm *acm)
 170 {
 171         int i, n;
 172         unsigned long flags;
 173
 174         n = ACM_NW;
 175         spin_lock_irqsave(&acm->write_lock, flags);
 176         for (i = 0; i < ACM_NW; i++)
 177                 n -= acm->wb[i].use;
 178         spin_unlock_irqrestore(&acm->write_lock, flags);
 179         return n;
 180 }
 181
 182 /*
 183  * Finish write. Caller must hold acm->write_lock
 184  */
 185 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 186 {
 187         wb->use = 0;
 188         acm->transmitting--;
 189         usb_autopm_put_interface_async(acm->control);
 190 }
 191
 192 /*
 193  * Poke write.
 194  *
 195  * the caller is responsible for locking
 196  */
 197
 198 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 199 {
 200         int rc;
 201
 202         acm->transmitting++;
 203
 204         wb->urb->transfer_buffer = wb->buf;
 205         wb->urb->transfer_dma = wb->dmah;
 206         wb->urb->transfer_buffer_length = wb->len;
 207         wb->urb->dev = acm->dev;
 208
 209         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 210         if (rc < 0) {
 211                 dev_err(&acm->data->dev,
 212                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 213                         __func__, rc);
 214                 acm_write_done(acm, wb);
 215         }
 216         return rc;
 217 }
 218
 219 /*
 220  * attributes exported through sysfs
 221  */
 222 static ssize_t show_caps
 223 (struct device *dev, struct device_attribute *attr, char *buf)
 224 {
 225         struct usb_interface *intf = to_usb_interface(dev);
 226         struct acm *acm = usb_get_intfdata(intf);
 227
 228         return sprintf(buf, "%d", acm->ctrl_caps);
 229 }
 230 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 231
 232 static ssize_t show_country_codes
 233 (struct device *dev, struct device_attribute *attr, char *buf)
 234 {
 235         struct usb_interface *intf = to_usb_interface(dev);
 236         struct acm *acm = usb_get_intfdata(intf);
 237
 238         memcpy(buf, acm->country_codes, acm->country_code_size);
 239         return acm->country_code_size;
 240 }
 241
 242 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 243
 244 static ssize_t show_country_rel_date
 245 (struct device *dev, struct device_attribute *attr, char *buf)
 246 {
 247         struct usb_interface *intf = to_usb_interface(dev);
 248         struct acm *acm = usb_get_intfdata(intf);
 249
 250         return sprintf(buf, "%d", acm->country_rel_date);
 251 }
 252
 253 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 254 /*
 255  * Interrupt handlers for various ACM device responses
 256  */
 257
 258 /* control interface reports status changes with "interrupt" transfers */
 259 static void acm_ctrl_irq(struct urb *urb)
 260 {
 261         struct acm *acm = urb->context;
 262         struct usb_cdc_notification *dr = urb->transfer_buffer;
 263         unsigned char *data;
 264         int newctrl;
 265         int retval;
 266         int status = urb->status;
 267
 268         switch (status) {
 269         case 0:
 270                 /* success */
 271                 break;
 272         case -ECONNRESET:
 273         case -ENOENT:
 274         case -ESHUTDOWN:
 275                 /* this urb is terminated, clean up */
 276                 dev_dbg(&acm->control->dev,
 277                                 "%s - urb shutting down with status: %d\n",
 278                                 __func__, status);
 279                 return;
 280         default:
 281                 dev_dbg(&acm->control->dev,
 282                                 "%s - nonzero urb status received: %d\n",
 283                                 __func__, status);
 284                 goto exit;
 285         }
 286
 287         usb_mark_last_busy(acm->dev);
 288
 289         data = (unsigned char *)(dr + 1);
 290         switch (dr->bNotificationType) {
 291         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 292                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
 293                                                         __func__, dr->wValue);
 294                 break;
 295
 296         case USB_CDC_NOTIFY_SERIAL_STATE:
 297                 newctrl = get_unaligned_le16(data);
 298
 299                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 300                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
 301                                         __func__);
 302                         tty_port_tty_hangup(&acm->port, false);
 303                 }
 304
 305                 acm->ctrlin = newctrl;
 306
 307                 dev_dbg(&acm->control->dev,
 308                         "%s - input control lines: dcd%c dsr%c break%c "
 309                         "ring%c framing%c parity%c overrun%c\n",
 310                         __func__,
 311                         acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
 312                         acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
 313                         acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
 314                         acm->ctrlin & ACM_CTRL_RI  ? '+' : '-',
 315                         acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
 316                         acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
 317                         acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
 318                         break;
 319
 320         default:
 321                 dev_dbg(&acm->control->dev,
 322                         "%s - unknown notification %d received: index %d "
 323                         "len %d data0 %d data1 %d\n",
 324                         __func__,
 325                         dr->bNotificationType, dr->wIndex,
 326                         dr->wLength, data[0], data[1]);
 327                 break;
 328         }
 329 exit:
 330         retval = usb_submit_urb(urb, GFP_ATOMIC);
 331         if (retval)
 332                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 333                                                         __func__, retval);
 334 }
 335
 336 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 337 {
 338         int res;
 339
 340         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 341                 return 0;
 342
 343         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
 344
 345         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 346         if (res) {
 347                 if (res != -EPERM) {
 348                         dev_err(&acm->data->dev,
 349                                         "%s - usb_submit_urb failed: %d\n",
 350                                         __func__, res);
 351                 }
 352                 set_bit(index, &acm->read_urbs_free);
 353                 return res;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 360 {
 361         int res;
 362         int i;
 363
 364         for (i = 0; i < acm->rx_buflimit; ++i) {
 365                 res = acm_submit_read_urb(acm, i, mem_flags);
 366                 if (res)
 367                         return res;
 368         }
 369
 370         return 0;
 371 }
 372
 373 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 374 {
 375         if (!urb->actual_length)
 376                 return;
 377
 378         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 379                         urb->actual_length);
 380         tty_flip_buffer_push(&acm->port);
 381 }
 382
 383 static void acm_read_bulk_callback(struct urb *urb)
 384 {
 385         struct acm_rb *rb = urb->context;
 386         struct acm *acm = rb->instance;
 387         unsigned long flags;
 388
 389         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
 390                                         rb->index, urb->actual_length);
 391         set_bit(rb->index, &acm->read_urbs_free);
 392
 393         if (!acm->dev) {
 394                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 395                 return;
 396         }
 397         usb_mark_last_busy(acm->dev);
 398
 399         if (urb->status) {
 400                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
 401                                                         __func__, urb->status);
 402                 return;
 403         }
 404         acm_process_read_urb(acm, urb);
 405
 406         /* throttle device if requested by tty */
 407         spin_lock_irqsave(&acm->read_lock, flags);
 408         acm->throttled = acm->throttle_req;
 409         if (!acm->throttled && !acm->susp_count) {
 410                 spin_unlock_irqrestore(&acm->read_lock, flags);
 411                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 412         } else {
 413                 spin_unlock_irqrestore(&acm->read_lock, flags);
 414         }
 415 }
 416
 417 /* data interface wrote those outgoing bytes */
 418 static void acm_write_bulk(struct urb *urb)
 419 {
 420         struct acm_wb *wb = urb->context;
 421         struct acm *acm = wb->instance;
 422         unsigned long flags;
 423
 424         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
 425                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
 426                         __func__,
 427                         urb->actual_length,
 428                         urb->transfer_buffer_length,
 429                         urb->status);
 430
 431         spin_lock_irqsave(&acm->write_lock, flags);
 432         acm_write_done(acm, wb);
 433         spin_unlock_irqrestore(&acm->write_lock, flags);
 434         schedule_work(&acm->work);
 435 }
 436
 437 static void acm_softint(struct work_struct *work)
 438 {
 439         struct acm *acm = container_of(work, struct acm, work);
 440
 441         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 442
 443         tty_port_tty_wakeup(&acm->port);
 444 }
 445
 446 /*
 447  * TTY handlers
 448  */
 449
 450 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 451 {
 452         struct acm *acm;
 453         int retval;
 454
 455         dev_dbg(tty->dev, "%s\n", __func__);
 456
 457         acm = acm_get_by_index(tty->index);
 458         if (!acm)
 459                 return -ENODEV;
 460
 461         retval = tty_standard_install(driver, tty);
 462         if (retval)
 463                 goto error_init_termios;
 464
 465         tty->driver_data = acm;
 466
 467         return 0;
 468
 469 error_init_termios:
 470         tty_port_put(&acm->port);
 471         return retval;
 472 }
 473
 474 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 475 {
 476         struct acm *acm = tty->driver_data;
 477
 478         dev_dbg(tty->dev, "%s\n", __func__);
 479
 480         return tty_port_open(&acm->port, tty, filp);
 481 }
 482
 483 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 484 {
 485         struct acm *acm = container_of(port, struct acm, port);
 486         int retval = -ENODEV;
 487
 488         dev_dbg(&acm->control->dev, "%s\n", __func__);
 489
 490         mutex_lock(&acm->mutex);
 491         if (acm->disconnected)
 492                 goto disconnected;
 493
 494         retval = usb_autopm_get_interface(acm->control);
 495         if (retval)
 496                 goto error_get_interface;
 497
 498         /*
 499          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 500          * memory is really nasty...
 501          */
 502         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 503         acm->control->needs_remote_wakeup = 1;
 504
 505         acm->ctrlurb->dev = acm->dev;
 506         if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
 507                 dev_err(&acm->control->dev,
 508                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 509                 goto error_submit_urb;
 510         }
 511
 512         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
 513         if (acm_set_control(acm, acm->ctrlout) < 0 &&
 514             (acm->ctrl_caps & USB_CDC_CAP_LINE))
 515                 goto error_set_control;
 516
 517         usb_autopm_put_interface(acm->control);
 518
 519         /*
 520          * Unthrottle device in case the TTY was closed while throttled.
 521          */
 522         spin_lock_irq(&acm->read_lock);
 523         acm->throttled = 0;
 524         acm->throttle_req = 0;
 525         spin_unlock_irq(&acm->read_lock);
 526
 527         if (acm_submit_read_urbs(acm, GFP_KERNEL))
 528                 goto error_submit_read_urbs;
 529
 530         mutex_unlock(&acm->mutex);
 531
 532         return 0;
 533
 534 error_submit_read_urbs:
 535         acm->ctrlout = 0;
 536         acm_set_control(acm, acm->ctrlout);
 537 error_set_control:
 538         usb_kill_urb(acm->ctrlurb);
 539 error_submit_urb:
 540         usb_autopm_put_interface(acm->control);
 541 error_get_interface:
 542 disconnected:
 543         mutex_unlock(&acm->mutex);
 544         return retval;
 545 }
 546
 547 static void acm_port_destruct(struct tty_port *port)
 548 {
 549         struct acm *acm = container_of(port, struct acm, port);
 550
 551         dev_dbg(&acm->control->dev, "%s\n", __func__);
 552
 553         acm_release_minor(acm);
 554         usb_put_intf(acm->control);
 555         kfree(acm->country_codes);
 556         kfree(acm);
 557 }
 558
 559 static void acm_port_shutdown(struct tty_port *port)
 560 {
 561         struct acm *acm = container_of(port, struct acm, port);
 562         int i;
 563
 564         dev_dbg(&acm->control->dev, "%s\n", __func__);
 565
 566         mutex_lock(&acm->mutex);
 567         if (!acm->disconnected) {
 568                 usb_autopm_get_interface(acm->control);
 569                 acm_set_control(acm, acm->ctrlout = 0);
 570                 usb_kill_urb(acm->ctrlurb);
 571                 for (i = 0; i < ACM_NW; i++)
 572                         usb_kill_urb(acm->wb[i].urb);
 573                 for (i = 0; i < acm->rx_buflimit; i++)
 574                         usb_kill_urb(acm->read_urbs[i]);
 575                 acm->control->needs_remote_wakeup = 0;
 576                 usb_autopm_put_interface(acm->control);
 577         }
 578         mutex_unlock(&acm->mutex);
 579 }
 580
 581 static void acm_tty_cleanup(struct tty_struct *tty)
 582 {
 583         struct acm *acm = tty->driver_data;
 584         dev_dbg(&acm->control->dev, "%s\n", __func__);
 585         tty_port_put(&acm->port);
 586 }
 587
 588 static void acm_tty_hangup(struct tty_struct *tty)
 589 {
 590         struct acm *acm = tty->driver_data;
 591         dev_dbg(&acm->control->dev, "%s\n", __func__);
 592         tty_port_hangup(&acm->port);
 593 }
 594
 595 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 596 {
 597         struct acm *acm = tty->driver_data;
 598         dev_dbg(&acm->control->dev, "%s\n", __func__);
 599         tty_port_close(&acm->port, tty, filp);
 600 }
 601
 602 static int acm_tty_write(struct tty_struct *tty,
 603                                         const unsigned char *buf, int count)
 604 {
 605         struct acm *acm = tty->driver_data;
 606         int stat;
 607         unsigned long flags;
 608         int wbn;
 609         struct acm_wb *wb;
 610
 611         if (!count)
 612                 return 0;
 613
 614         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 615
 616         spin_lock_irqsave(&acm->write_lock, flags);
 617         wbn = acm_wb_alloc(acm);
 618         if (wbn < 0) {
 619                 spin_unlock_irqrestore(&acm->write_lock, flags);
 620                 return 0;
 621         }
 622         wb = &acm->wb[wbn];
 623
 624         if (!acm->dev) {
 625                 wb->use = 0;
 626                 spin_unlock_irqrestore(&acm->write_lock, flags);
 627                 return -ENODEV;
 628         }
 629
 630         count = (count > acm->writesize) ? acm->writesize : count;
 631         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 632         memcpy(wb->buf, buf, count);
 633         wb->len = count;
 634
 635         usb_autopm_get_interface_async(acm->control);
 636         if (acm->susp_count) {
 637                 if (!acm->delayed_wb)
 638                         acm->delayed_wb = wb;
 639                 else
 640                         usb_autopm_put_interface_async(acm->control);
 641                 spin_unlock_irqrestore(&acm->write_lock, flags);
 642                 return count;   /* A white lie */
 643         }
 644         usb_mark_last_busy(acm->dev);
 645
 646         stat = acm_start_wb(acm, wb);
 647         spin_unlock_irqrestore(&acm->write_lock, flags);
 648
 649         if (stat < 0)
 650                 return stat;
 651         return count;
 652 }
 653
 654 static int acm_tty_write_room(struct tty_struct *tty)
 655 {
 656         struct acm *acm = tty->driver_data;
 657         /*
 658          * Do not let the line discipline to know that we have a reserve,
 659          * or it might get too enthusiastic.
 660          */
 661         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 662 }
 663
 664 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 665 {
 666         struct acm *acm = tty->driver_data;
 667         /*
 668          * if the device was unplugged then any remaining characters fell out
 669          * of the connector ;)
 670          */
 671         if (acm->disconnected)
 672                 return 0;
 673         /*
 674          * This is inaccurate (overcounts), but it works.
 675          */
 676         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 677 }
 678
 679 static void acm_tty_throttle(struct tty_struct *tty)
 680 {
 681         struct acm *acm = tty->driver_data;
 682
 683         spin_lock_irq(&acm->read_lock);
 684         acm->throttle_req = 1;
 685         spin_unlock_irq(&acm->read_lock);
 686 }
 687
 688 static void acm_tty_unthrottle(struct tty_struct *tty)
 689 {
 690         struct acm *acm = tty->driver_data;
 691         unsigned int was_throttled;
 692
 693         spin_lock_irq(&acm->read_lock);
 694         was_throttled = acm->throttled;
 695         acm->throttled = 0;
 696         acm->throttle_req = 0;
 697         spin_unlock_irq(&acm->read_lock);
 698
 699         if (was_throttled)
 700                 acm_submit_read_urbs(acm, GFP_KERNEL);
 701 }
 702
 703 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 704 {
 705         struct acm *acm = tty->driver_data;
 706         int retval;
 707
 708         retval = acm_send_break(acm, state ? 0xffff : 0);
 709         if (retval < 0)
 710                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 711                                                                 __func__);
 712         return retval;
 713 }
 714
 715 static int acm_tty_tiocmget(struct tty_struct *tty)
 716 {
 717         struct acm *acm = tty->driver_data;
 718
 719         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 720                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 721                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 722                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 723                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 724                TIOCM_CTS;
 725 }
 726
 727 static int acm_tty_tiocmset(struct tty_struct *tty,
 728                             unsigned int set, unsigned int clear)
 729 {
 730         struct acm *acm = tty->driver_data;
 731         unsigned int newctrl;
 732
 733         newctrl = acm->ctrlout;
 734         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 735                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 736         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 737                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 738
 739         newctrl = (newctrl & ~clear) | set;
 740
 741         if (acm->ctrlout == newctrl)
 742                 return 0;
 743         return acm_set_control(acm, acm->ctrlout = newctrl);
 744 }
 745
 746 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 747 {
 748         struct serial_struct tmp;
 749
 750         if (!info)
 751                 return -EINVAL;
 752
 753         memset(&tmp, 0, sizeof(tmp));
 754         tmp.flags = ASYNC_LOW_LATENCY;
 755         tmp.xmit_fifo_size = acm->writesize;
 756         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 757         tmp.close_delay = acm->port.close_delay / 10;
 758         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 759                                 ASYNC_CLOSING_WAIT_NONE :
 760                                 acm->port.closing_wait / 10;
 761
 762         if (copy_to_user(info, &tmp, sizeof(tmp)))
 763                 return -EFAULT;
 764         else
 765                 return 0;
 766 }
 767
 768 static int set_serial_info(struct acm *acm,
 769                                 struct serial_struct __user *newinfo)
 770 {
 771         struct serial_struct new_serial;
 772         unsigned int closing_wait, close_delay;
 773         int retval = 0;
 774
 775         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 776                 return -EFAULT;
 777
 778         close_delay = new_serial.close_delay * 10;
 779         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 780                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 781
 782         mutex_lock(&acm->port.mutex);
 783
 784         if (!capable(CAP_SYS_ADMIN)) {
 785                 if ((close_delay != acm->port.close_delay) ||
 786                     (closing_wait != acm->port.closing_wait))
 787                         retval = -EPERM;
 788                 else
 789                         retval = -EOPNOTSUPP;
 790         } else {
 791                 acm->port.close_delay  = close_delay;
 792                 acm->port.closing_wait = closing_wait;
 793         }
 794
 795         mutex_unlock(&acm->port.mutex);
 796         return retval;
 797 }
 798
 799 static int acm_tty_ioctl(struct tty_struct *tty,
 800                                         unsigned int cmd, unsigned long arg)
 801 {
 802         struct acm *acm = tty->driver_data;
 803         int rv = -ENOIOCTLCMD;
 804
 805         switch (cmd) {
 806         case TIOCGSERIAL: /* gets serial port data */
 807                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 808                 break;
 809         case TIOCSSERIAL:
 810                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 811                 break;
 812         }
 813
 814         return rv;
 815 }
 816
 817 static void acm_tty_set_termios(struct tty_struct *tty,
 818                                                 struct ktermios *termios_old)
 819 {
 820         struct acm *acm = tty->driver_data;
 821         struct ktermios *termios = &tty->termios;
 822         struct usb_cdc_line_coding newline;
 823         int newctrl = acm->ctrlout;
 824
 825         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 826         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 827         newline.bParityType = termios->c_cflag & PARENB ?
 828                                 (termios->c_cflag & PARODD ? 1 : 2) +
 829                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 830         switch (termios->c_cflag & CSIZE) {
 831         case CS5:
 832                 newline.bDataBits = 5;
 833                 break;
 834         case CS6:
 835                 newline.bDataBits = 6;
 836                 break;
 837         case CS7:
 838                 newline.bDataBits = 7;
 839                 break;
 840         case CS8:
 841         default:
 842                 newline.bDataBits = 8;
 843                 break;
 844         }
 845         /* FIXME: Needs to clear unsupported bits in the termios */
 846         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 847
 848         if (!newline.dwDTERate) {
 849                 newline.dwDTERate = acm->line.dwDTERate;
 850                 newctrl &= ~ACM_CTRL_DTR;
 851         } else
 852                 newctrl |=  ACM_CTRL_DTR;
 853
 854         if (newctrl != acm->ctrlout)
 855                 acm_set_control(acm, acm->ctrlout = newctrl);
 856
 857         if (memcmp(&acm->line, &newline, sizeof newline)) {
 858                 memcpy(&acm->line, &newline, sizeof newline);
 859                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 860                         __func__,
 861                         le32_to_cpu(newline.dwDTERate),
 862                         newline.bCharFormat, newline.bParityType,
 863                         newline.bDataBits);
 864                 acm_set_line(acm, &acm->line);
 865         }
 866 }
 867
 868 static const struct tty_port_operations acm_port_ops = {
 869         .shutdown = acm_port_shutdown,
 870         .activate = acm_port_activate,
 871         .destruct = acm_port_destruct,
 872 };
 873
 874 /*
 875  * USB probe and disconnect routines.
 876  */
 877
 878 /* Little helpers: write/read buffers free */
 879 static void acm_write_buffers_free(struct acm *acm)
 880 {
 881         int i;
 882         struct acm_wb *wb;
 883         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 884
 885         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
 886                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
 887 }
 888
 889 static void acm_read_buffers_free(struct acm *acm)
 890 {
 891         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 892         int i;
 893
 894         for (i = 0; i < acm->rx_buflimit; i++)
 895                 usb_free_coherent(usb_dev, acm->readsize,
 896                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
 897 }
 898
 899 /* Little helper: write buffers allocate */
 900 static int acm_write_buffers_alloc(struct acm *acm)
 901 {
 902         int i;
 903         struct acm_wb *wb;
 904
 905         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
 906                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
 907                     &wb->dmah);
 908                 if (!wb->buf) {
 909                         while (i != 0) {
 910                                 --i;
 911                                 --wb;
 912                                 usb_free_coherent(acm->dev, acm->writesize,
 913                                     wb->buf, wb->dmah);
 914                         }
 915                         return -ENOMEM;
 916                 }
 917         }
 918         return 0;
 919 }
 920
 921 static int acm_probe(struct usb_interface *intf,
 922                      const struct usb_device_id *id)
 923 {
 924         struct usb_cdc_union_desc *union_header = NULL;
 925         struct usb_cdc_country_functional_desc *cfd = NULL;
 926         unsigned char *buffer = intf->altsetting->extra;
 927         int buflen = intf->altsetting->extralen;
 928         struct usb_interface *control_interface;
 929         struct usb_interface *data_interface;
 930         struct usb_endpoint_descriptor *epctrl = NULL;
 931         struct usb_endpoint_descriptor *epread = NULL;
 932         struct usb_endpoint_descriptor *epwrite = NULL;
 933         struct usb_device *usb_dev = interface_to_usbdev(intf);
 934         struct acm *acm;
 935         int minor;
 936         int ctrlsize, readsize;
 937         u8 *buf;
 938         u8 ac_management_function = 0;
 939         u8 call_management_function = 0;
 940         int call_interface_num = -1;
 941         int data_interface_num = -1;
 942         unsigned long quirks;
 943         int num_rx_buf;
 944         int i;
 945         int combined_interfaces = 0;
 946         struct device *tty_dev;
 947         int rv = -ENOMEM;
 948
 949         /* normal quirks */
 950         quirks = (unsigned long)id->driver_info;
 951
 952         if (quirks == IGNORE_DEVICE)
 953                 return -ENODEV;
 954
 955         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
 956
 957         /* handle quirks deadly to normal probing*/
 958         if (quirks == NO_UNION_NORMAL) {
 959                 data_interface = usb_ifnum_to_if(usb_dev, 1);
 960                 control_interface = usb_ifnum_to_if(usb_dev, 0);
 961                 goto skip_normal_probe;
 962         }
 963
 964         /* normal probing*/
 965         if (!buffer) {
 966                 dev_err(&intf->dev, "Weird descriptor references\n");
 967                 return -EINVAL;
 968         }
 969
 970         if (!buflen) {
 971                 if (intf->cur_altsetting->endpoint &&
 972                                 intf->cur_altsetting->endpoint->extralen &&
 973                                 intf->cur_altsetting->endpoint->extra) {
 974                         dev_dbg(&intf->dev,
 975                                 "Seeking extra descriptors on endpoint\n");
 976                         buflen = intf->cur_altsetting->endpoint->extralen;
 977                         buffer = intf->cur_altsetting->endpoint->extra;
 978                 } else {
 979                         dev_err(&intf->dev,
 980                                 "Zero length descriptor references\n");
 981                         return -EINVAL;
 982                 }
 983         }
 984
 985         while (buflen > 0) {
 986                 if (buffer[1] != USB_DT_CS_INTERFACE) {
 987                         dev_err(&intf->dev, "skipping garbage\n");
 988                         goto next_desc;
 989                 }
 990
 991                 switch (buffer[2]) {
 992                 case USB_CDC_UNION_TYPE: /* we've found it */
 993                         if (union_header) {
 994                                 dev_err(&intf->dev, "More than one "
 995                                         "union descriptor, skipping ...\n");
 996                                 goto next_desc;
 997                         }
 998                         union_header = (struct usb_cdc_union_desc *)buffer;
 999                         break;
1000                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1001                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1002                         break;
1003                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1004                         break; /* for now we ignore it */
1005                 case USB_CDC_ACM_TYPE:
1006                         ac_management_function = buffer[3];
1007                         break;
1008                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1009                         call_management_function = buffer[3];
1010                         call_interface_num = buffer[4];
1011                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1012                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1013                         break;
1014                 default:
1015                         /* there are LOTS more CDC descriptors that
1016                          * could legitimately be found here.
1017                          */
1018                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1019                                         "type %02x, length %d\n",
1020                                         buffer[2], buffer[0]);
1021                         break;
1022                 }
1023 next_desc:
1024                 buflen -= buffer[0];
1025                 buffer += buffer[0];
1026         }
1027
1028         if (!union_header) {
1029                 if (call_interface_num > 0) {
1030                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1031                         /* quirks for Droids MuIn LCD */
1032                         if (quirks & NO_DATA_INTERFACE)
1033                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1034                         else
1035                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1036                         control_interface = intf;
1037                 } else {
1038                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1039                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1040                                 return -ENODEV;
1041                         } else {
1042                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1043                                 combined_interfaces = 1;
1044                                 control_interface = data_interface = intf;
1045                                 goto look_for_collapsed_interface;
1046                         }
1047                 }
1048         } else {
1049                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1050                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1051                 if (!control_interface || !data_interface) {
1052                         dev_dbg(&intf->dev, "no interfaces\n");
1053                         return -ENODEV;
1054                 }
1055         }
1056
1057         if (data_interface_num != call_interface_num)
1058                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1059
1060         if (control_interface == data_interface) {
1061                 /* some broken devices designed for windows work this way */
1062                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1063                 combined_interfaces = 1;
1064                 /* a popular other OS doesn't use it */
1065                 quirks |= NO_CAP_LINE;
1066                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1067                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1068                         return -EINVAL;
1069                 }
1070 look_for_collapsed_interface:
1071                 for (i = 0; i < 3; i++) {
1072                         struct usb_endpoint_descriptor *ep;
1073                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1074
1075                         if (usb_endpoint_is_int_in(ep))
1076                                 epctrl = ep;
1077                         else if (usb_endpoint_is_bulk_out(ep))
1078                                 epwrite = ep;
1079                         else if (usb_endpoint_is_bulk_in(ep))
1080                                 epread = ep;
1081                         else
1082                                 return -EINVAL;
1083                 }
1084                 if (!epctrl || !epread || !epwrite)
1085                         return -ENODEV;
1086                 else
1087                         goto made_compressed_probe;
1088         }
1089
1090 skip_normal_probe:
1091
1092         /*workaround for switched interfaces */
1093         if (data_interface->cur_altsetting->desc.bInterfaceClass
1094                                                 != CDC_DATA_INTERFACE_TYPE) {
1095                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1096                                                 == CDC_DATA_INTERFACE_TYPE) {
1097                         struct usb_interface *t;
1098                         dev_dbg(&intf->dev,
1099                                 "Your device has switched interfaces.\n");
1100                         t = control_interface;
1101                         control_interface = data_interface;
1102                         data_interface = t;
1103                 } else {
1104                         return -EINVAL;
1105                 }
1106         }
1107
1108         /* Accept probe requests only for the control interface */
1109         if (!combined_interfaces && intf != control_interface)
1110                 return -ENODEV;
1111
1112         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1113                 /* valid in this context */
1114                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1115                 return -EBUSY;
1116         }
1117
1118
1119         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1120             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1121                 return -EINVAL;
1122
1123         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1124         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1125         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1126
1127
1128         /* workaround for switched endpoints */
1129         if (!usb_endpoint_dir_in(epread)) {
1130                 /* descriptors are swapped */
1131                 struct usb_endpoint_descriptor *t;
1132                 dev_dbg(&intf->dev,
1133                         "The data interface has switched endpoints\n");
1134                 t = epread;
1135                 epread = epwrite;
1136                 epwrite = t;
1137         }
1138 made_compressed_probe:
1139         dev_dbg(&intf->dev, "interfaces are valid\n");
1140
1141         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1142         if (acm == NULL) {
1143                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1144                 goto alloc_fail;
1145         }
1146
1147         minor = acm_alloc_minor(acm);
1148         if (minor == ACM_TTY_MINORS) {
1149                 dev_err(&intf->dev, "no more free acm devices\n");
1150                 kfree(acm);
1151                 return -ENODEV;
1152         }
1153
1154         ctrlsize = usb_endpoint_maxp(epctrl);
1155         readsize = usb_endpoint_maxp(epread) *
1156                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1157         acm->combined_interfaces = combined_interfaces;
1158         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1159         acm->control = control_interface;
1160         acm->data = data_interface;
1161         acm->minor = minor;
1162         acm->dev = usb_dev;
1163         acm->ctrl_caps = ac_management_function;
1164         if (quirks & NO_CAP_LINE)
1165                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1166         acm->ctrlsize = ctrlsize;
1167         acm->readsize = readsize;
1168         acm->rx_buflimit = num_rx_buf;
1169         INIT_WORK(&acm->work, acm_softint);
1170         spin_lock_init(&acm->write_lock);
1171         spin_lock_init(&acm->read_lock);
1172         mutex_init(&acm->mutex);
1173         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1174         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1175         if (acm->is_int_ep)
1176                 acm->bInterval = epread->bInterval;
1177         tty_port_init(&acm->port);
1178         acm->port.ops = &acm_port_ops;
1179
1180         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1181         if (!buf) {
1182                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1183                 goto alloc_fail2;
1184         }
1185         acm->ctrl_buffer = buf;
1186
1187         if (acm_write_buffers_alloc(acm) < 0) {
1188                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1189                 goto alloc_fail4;
1190         }
1191
1192         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1193         if (!acm->ctrlurb) {
1194                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1195                 goto alloc_fail5;
1196         }
1197         for (i = 0; i < num_rx_buf; i++) {
1198                 struct acm_rb *rb = &(acm->read_buffers[i]);
1199                 struct urb *urb;
1200
1201                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1202                                                                 &rb->dma);
1203                 if (!rb->base) {
1204                         dev_err(&intf->dev, "out of memory "
1205                                         "(read bufs usb_alloc_coherent)\n");
1206                         goto alloc_fail6;
1207                 }
1208                 rb->index = i;
1209                 rb->instance = acm;
1210
1211                 urb = usb_alloc_urb(0, GFP_KERNEL);
1212                 if (!urb) {
1213                         dev_err(&intf->dev,
1214                                 "out of memory (read urbs usb_alloc_urb)\n");
1215                         goto alloc_fail6;
1216                 }
1217                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1218                 urb->transfer_dma = rb->dma;
1219                 if (acm->is_int_ep) {
1220                         usb_fill_int_urb(urb, acm->dev,
1221                                          acm->rx_endpoint,
1222                                          rb->base,
1223                                          acm->readsize,
1224                                          acm_read_bulk_callback, rb,
1225                                          acm->bInterval);
1226                 } else {
1227                         usb_fill_bulk_urb(urb, acm->dev,
1228                                           acm->rx_endpoint,
1229                                           rb->base,
1230                                           acm->readsize,
1231                                           acm_read_bulk_callback, rb);
1232                 }
1233
1234                 acm->read_urbs[i] = urb;
1235                 __set_bit(i, &acm->read_urbs_free);
1236         }
1237         for (i = 0; i < ACM_NW; i++) {
1238                 struct acm_wb *snd = &(acm->wb[i]);
1239
1240                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1241                 if (snd->urb == NULL) {
1242                         dev_err(&intf->dev,
1243                                 "out of memory (write urbs usb_alloc_urb)\n");
1244                         goto alloc_fail7;
1245                 }
1246
1247                 if (usb_endpoint_xfer_int(epwrite))
1248                         usb_fill_int_urb(snd->urb, usb_dev,
1249                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1250                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1251                 else
1252                         usb_fill_bulk_urb(snd->urb, usb_dev,
1253                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1254                                 NULL, acm->writesize, acm_write_bulk, snd);
1255                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1256                 snd->instance = acm;
1257         }
1258
1259         usb_set_intfdata(intf, acm);
1260
1261         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1262         if (i < 0)
1263                 goto alloc_fail7;
1264
1265         if (cfd) { /* export the country data */
1266                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1267                 if (!acm->country_codes)
1268                         goto skip_countries;
1269                 acm->country_code_size = cfd->bLength - 4;
1270                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1271                                                         cfd->bLength - 4);
1272                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1273
1274                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1275                 if (i < 0) {
1276                         kfree(acm->country_codes);
1277                         acm->country_codes = NULL;
1278                         acm->country_code_size = 0;
1279                         goto skip_countries;
1280                 }
1281
1282                 i = device_create_file(&intf->dev,
1283                                                 &dev_attr_iCountryCodeRelDate);
1284                 if (i < 0) {
1285                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1286                         kfree(acm->country_codes);
1287                         acm->country_codes = NULL;
1288                         acm->country_code_size = 0;
1289                         goto skip_countries;
1290                 }
1291         }
1292
1293 skip_countries:
1294         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1295                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1296                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1297                          /* works around buggy devices */
1298                          epctrl->bInterval ? epctrl->bInterval : 16);
1299         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1300         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1301
1302         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1303
1304         acm_set_control(acm, acm->ctrlout);
1305
1306         acm->line.dwDTERate = cpu_to_le32(9600);
1307         acm->line.bDataBits = 8;
1308         acm_set_line(acm, &acm->line);
1309
1310         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1311         usb_set_intfdata(data_interface, acm);
1312
1313         usb_get_intf(control_interface);
1314         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1315                         &control_interface->dev);
1316         if (IS_ERR(tty_dev)) {
1317                 rv = PTR_ERR(tty_dev);
1318                 goto alloc_fail8;
1319         }
1320
1321         return 0;
1322 alloc_fail8:
1323         if (acm->country_codes) {
1324                 device_remove_file(&acm->control->dev,
1325                                 &dev_attr_wCountryCodes);
1326                 device_remove_file(&acm->control->dev,
1327                                 &dev_attr_iCountryCodeRelDate);
1328         }
1329         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1330 alloc_fail7:
1331         usb_set_intfdata(intf, NULL);
1332         for (i = 0; i < ACM_NW; i++)
1333                 usb_free_urb(acm->wb[i].urb);
1334 alloc_fail6:
1335         for (i = 0; i < num_rx_buf; i++)
1336                 usb_free_urb(acm->read_urbs[i]);
1337         acm_read_buffers_free(acm);
1338         usb_free_urb(acm->ctrlurb);
1339 alloc_fail5:
1340         acm_write_buffers_free(acm);
1341 alloc_fail4:
1342         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1343 alloc_fail2:
1344         acm_release_minor(acm);
1345         kfree(acm);
1346 alloc_fail:
1347         return rv;
1348 }
1349
1350 static void stop_data_traffic(struct acm *acm)
1351 {
1352         int i;
1353
1354         dev_dbg(&acm->control->dev, "%s\n", __func__);
1355
1356         usb_kill_urb(acm->ctrlurb);
1357         for (i = 0; i < ACM_NW; i++)
1358                 usb_kill_urb(acm->wb[i].urb);
1359         for (i = 0; i < acm->rx_buflimit; i++)
1360                 usb_kill_urb(acm->read_urbs[i]);
1361
1362         cancel_work_sync(&acm->work);
1363 }
1364
1365 static void acm_disconnect(struct usb_interface *intf)
1366 {
1367         struct acm *acm = usb_get_intfdata(intf);
1368         struct usb_device *usb_dev = interface_to_usbdev(intf);
1369         struct tty_struct *tty;
1370         int i;
1371
1372         dev_dbg(&intf->dev, "%s\n", __func__);
1373
1374         /* sibling interface is already cleaning up */
1375         if (!acm)
1376                 return;
1377
1378         mutex_lock(&acm->mutex);
1379         acm->disconnected = true;
1380         if (acm->country_codes) {
1381                 device_remove_file(&acm->control->dev,
1382                                 &dev_attr_wCountryCodes);
1383                 device_remove_file(&acm->control->dev,
1384                                 &dev_attr_iCountryCodeRelDate);
1385         }
1386         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1387         usb_set_intfdata(acm->control, NULL);
1388         usb_set_intfdata(acm->data, NULL);
1389         mutex_unlock(&acm->mutex);
1390
1391         tty = tty_port_tty_get(&acm->port);
1392         if (tty) {
1393                 tty_vhangup(tty);
1394                 tty_kref_put(tty);
1395         }
1396
1397         stop_data_traffic(acm);
1398
1399         tty_unregister_device(acm_tty_driver, acm->minor);
1400
1401         usb_free_urb(acm->ctrlurb);
1402         for (i = 0; i < ACM_NW; i++)
1403                 usb_free_urb(acm->wb[i].urb);
1404         for (i = 0; i < acm->rx_buflimit; i++)
1405                 usb_free_urb(acm->read_urbs[i]);
1406         acm_write_buffers_free(acm);
1407         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1408         acm_read_buffers_free(acm);
1409
1410         if (!acm->combined_interfaces)
1411                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1412                                         acm->data : acm->control);
1413
1414         tty_port_put(&acm->port);
1415 }
1416
1417 #ifdef CONFIG_PM
1418 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1419 {
1420         struct acm *acm = usb_get_intfdata(intf);
1421         int cnt;
1422
1423         if (PMSG_IS_AUTO(message)) {
1424                 int b;
1425
1426                 spin_lock_irq(&acm->write_lock);
1427                 b = acm->transmitting;
1428                 spin_unlock_irq(&acm->write_lock);
1429                 if (b)
1430                         return -EBUSY;
1431         }
1432
1433         spin_lock_irq(&acm->read_lock);
1434         spin_lock(&acm->write_lock);
1435         cnt = acm->susp_count++;
1436         spin_unlock(&acm->write_lock);
1437         spin_unlock_irq(&acm->read_lock);
1438
1439         if (cnt)
1440                 return 0;
1441
1442         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1443                 stop_data_traffic(acm);
1444
1445         return 0;
1446 }
1447
1448 static int acm_resume(struct usb_interface *intf)
1449 {
1450         struct acm *acm = usb_get_intfdata(intf);
1451         struct acm_wb *wb;
1452         int rv = 0;
1453         int cnt;
1454
1455         spin_lock_irq(&acm->read_lock);
1456         acm->susp_count -= 1;
1457         cnt = acm->susp_count;
1458         spin_unlock_irq(&acm->read_lock);
1459
1460         if (cnt)
1461                 return 0;
1462
1463         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1464                 rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1465
1466                 spin_lock_irq(&acm->write_lock);
1467                 if (acm->delayed_wb) {
1468                         wb = acm->delayed_wb;
1469                         acm->delayed_wb = NULL;
1470                         spin_unlock_irq(&acm->write_lock);
1471                         acm_start_wb(acm, wb);
1472                 } else {
1473                         spin_unlock_irq(&acm->write_lock);
1474                 }
1475
1476                 /*
1477                  * delayed error checking because we must
1478                  * do the write path at all cost
1479                  */
1480                 if (rv < 0)
1481                         goto err_out;
1482
1483                 rv = acm_submit_read_urbs(acm, GFP_NOIO);
1484         }
1485
1486 err_out:
1487         return rv;
1488 }
1489
1490 static int acm_reset_resume(struct usb_interface *intf)
1491 {
1492         struct acm *acm = usb_get_intfdata(intf);
1493
1494         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1495                 tty_port_tty_hangup(&acm->port, false);
1496
1497         return acm_resume(intf);
1498 }
1499
1500 #endif /* CONFIG_PM */
1501
1502 #define NOKIA_PCSUITE_ACM_INFO(x) \
1503                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1504                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1505                 USB_CDC_ACM_PROTO_VENDOR)
1506
1507 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1508                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1509                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1510                 USB_CDC_ACM_PROTO_VENDOR)
1511
1512 /*
1513  * USB driver structure.
1514  */
1515
1516 static const struct usb_device_id acm_ids[] = {
1517         /* quirky and broken devices */
1518         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1519         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1520         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1521         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1522         },
1523         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1524         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1525         },
1526         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1527         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1528         },
1529         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1530         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1531         },
1532         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1533         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1534         },
1535         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1536         .driver_info = SINGLE_RX_URB,
1537         },
1538         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1539         .driver_info = SINGLE_RX_URB, /* firmware bug */
1540         },
1541         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1542         .driver_info = SINGLE_RX_URB, /* firmware bug */
1543         },
1544         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1545         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1546         },
1547         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1548         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1549         },
1550         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1551         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1552         },
1553         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1554         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1555         },
1556         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1557         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1558         },
1559         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1560         },
1561         /* Motorola H24 HSPA module: */
1562         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1563         { USB_DEVICE(0x22b8, 0x2d92) }, /* modem           + diagnostics        */
1564         { USB_DEVICE(0x22b8, 0x2d93) }, /* modem + AT port                      */
1565         { USB_DEVICE(0x22b8, 0x2d95) }, /* modem + AT port + diagnostics        */
1566         { USB_DEVICE(0x22b8, 0x2d96) }, /* modem                         + NMEA */
1567         { USB_DEVICE(0x22b8, 0x2d97) }, /* modem           + diagnostics + NMEA */
1568         { USB_DEVICE(0x22b8, 0x2d99) }, /* modem + AT port               + NMEA */
1569         { USB_DEVICE(0x22b8, 0x2d9a) }, /* modem + AT port + diagnostics + NMEA */
1570
1571         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1572         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1573                                            data interface instead of
1574                                            communications interface.
1575                                            Maybe we should define a new
1576                                            quirk for this. */
1577         },
1578         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1579         .driver_info = NO_UNION_NORMAL,
1580         },
1581         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1582         .driver_info = NO_UNION_NORMAL,
1583         },
1584         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1585         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1586         },
1587         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1588         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1589         },
1590
1591         /* Nokia S60 phones expose two ACM channels. The first is
1592          * a modem and is picked up by the standard AT-command
1593          * information below. The second is 'vendor-specific' but
1594          * is treated as a serial device at the S60 end, so we want
1595          * to expose it on Linux too. */
1596         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1597         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1598         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1599         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1600         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1601         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1602         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1603         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1604         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1605         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1606         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1607         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1608         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1609         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1610         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1611         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1612         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1613         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1614         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1615         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1616         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1617         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1618         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1619         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1620         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1621         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1622         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1623         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1624         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1625         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1626         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1627         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1628         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1629         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1630         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1631         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1632         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1633         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1634         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1635         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1636         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1637         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1638         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1639         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1640         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1641         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1642         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1643         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1644         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1645         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1646         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1647         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1648         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1649         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1650         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1651         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1652         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1653         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1654
1655         /* Support for Owen devices */
1656         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1657
1658         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1659
1660         /* Support Lego NXT using pbLua firmware */
1661         { USB_DEVICE(0x0694, 0xff00),
1662         .driver_info = NOT_A_MODEM,
1663         },
1664
1665         /* Support for Droids MuIn LCD */
1666         { USB_DEVICE(0x04d8, 0x000b),
1667         .driver_info = NO_DATA_INTERFACE,
1668         },
1669
1670 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1671         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1672         .driver_info = IGNORE_DEVICE,
1673         },
1674         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1675         .driver_info = IGNORE_DEVICE,
1676         },
1677 #endif
1678
1679         /* control interfaces without any protocol set */
1680         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1681                 USB_CDC_PROTO_NONE) },
1682
1683         /* control interfaces with various AT-command sets */
1684         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1685                 USB_CDC_ACM_PROTO_AT_V25TER) },
1686         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1687                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1688         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1689                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1690         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1691                 USB_CDC_ACM_PROTO_AT_GSM) },
1692         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1693                 USB_CDC_ACM_PROTO_AT_3G) },
1694         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1695                 USB_CDC_ACM_PROTO_AT_CDMA) },
1696
1697         { }
1698 };
1699
1700 MODULE_DEVICE_TABLE(usb, acm_ids);
1701
1702 static struct usb_driver acm_driver = {
1703         .name =         "cdc_acm",
1704         .probe =        acm_probe,
1705         .disconnect =   acm_disconnect,
1706 #ifdef CONFIG_PM
1707         .suspend =      acm_suspend,
1708         .resume =       acm_resume,
1709         .reset_resume = acm_reset_resume,
1710 #endif
1711         .id_table =     acm_ids,
1712 #ifdef CONFIG_PM
1713         .supports_autosuspend = 1,
1714 #endif
1715         .disable_hub_initiated_lpm = 1,
1716 };
1717
1718 /*
1719  * TTY driver structures.
1720  */
1721
1722 static const struct tty_operations acm_ops = {
1723         .install =              acm_tty_install,
1724         .open =                 acm_tty_open,
1725         .close =                acm_tty_close,
1726         .cleanup =              acm_tty_cleanup,
1727         .hangup =               acm_tty_hangup,
1728         .write =                acm_tty_write,
1729         .write_room =           acm_tty_write_room,
1730         .ioctl =                acm_tty_ioctl,
1731         .throttle =             acm_tty_throttle,
1732         .unthrottle =           acm_tty_unthrottle,
1733         .chars_in_buffer =      acm_tty_chars_in_buffer,
1734         .break_ctl =            acm_tty_break_ctl,
1735         .set_termios =          acm_tty_set_termios,
1736         .tiocmget =             acm_tty_tiocmget,
1737         .tiocmset =             acm_tty_tiocmset,
1738 };
1739
1740 /*
1741  * Init / exit.
1742  */
1743
1744 static int __init acm_init(void)
1745 {
1746         int retval;
1747         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1748         if (!acm_tty_driver)
1749                 return -ENOMEM;
1750         acm_tty_driver->driver_name = "acm",
1751         acm_tty_driver->name = "ttyACM",
1752         acm_tty_driver->major = ACM_TTY_MAJOR,
1753         acm_tty_driver->minor_start = 0,
1754         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1755         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1756         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1757         acm_tty_driver->init_termios = tty_std_termios;
1758         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1759                                                                 HUPCL | CLOCAL;
1760         tty_set_operations(acm_tty_driver, &acm_ops);
1761
1762         retval = tty_register_driver(acm_tty_driver);
1763         if (retval) {
1764                 put_tty_driver(acm_tty_driver);
1765                 return retval;
1766         }
1767
1768         retval = usb_register(&acm_driver);
1769         if (retval) {
1770                 tty_unregister_driver(acm_tty_driver);
1771                 put_tty_driver(acm_tty_driver);
1772                 return retval;
1773         }
1774
1775         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1776
1777         return 0;
1778 }
1779
1780 static void __exit acm_exit(void)
1781 {
1782         usb_deregister(&acm_driver);
1783         tty_unregister_driver(acm_tty_driver);
1784         put_tty_driver(acm_tty_driver);
1785 }
1786
1787 module_init(acm_init);
1788 module_exit(acm_exit);
1789
1790 MODULE_AUTHOR(DRIVER_AUTHOR);
1791 MODULE_DESCRIPTION(DRIVER_DESC);
1792 MODULE_LICENSE("GPL");
1793 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);