drivers/usb/class/cdc-acm.c

   1 /*
   2  * cdc-acm.c
   3  *
   4  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
   5  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
   6  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
   7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   8  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
   9  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
  10  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
  11  *
  12  * USB Abstract Control Model driver for USB modems and ISDN adapters
  13  *
  14  * Sponsored by SuSE
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  29  */
  30
  31 #undef DEBUG
  32 #undef VERBOSE_DEBUG
  33
  34 #include <linux/kernel.h>
  35 #include <linux/errno.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/tty.h>
  39 #include <linux/serial.h>
  40 #include <linux/tty_driver.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/module.h>
  43 #include <linux/mutex.h>
  44 #include <linux/uaccess.h>
  45 #include <linux/usb.h>
  46 #include <linux/usb/cdc.h>
  47 #include <asm/byteorder.h>
  48 #include <asm/unaligned.h>
  49 #include <linux/list.h>
  50
  51 #include "cdc-acm.h"
  52
  53
  54 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  55 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  56
  57 static struct usb_driver acm_driver;
  58 static struct tty_driver *acm_tty_driver;
  59 static struct acm *acm_table[ACM_TTY_MINORS];
  60
  61 static DEFINE_MUTEX(acm_table_lock);
  62
  63 /*
  64  * acm_table accessors
  65  */
  66
  67 /*
  68  * Look up an ACM structure by index. If found and not disconnected, increment
  69  * its refcount and return it with its mutex held.
  70  */
  71 static struct acm *acm_get_by_index(unsigned index)
  72 {
  73         struct acm *acm;
  74
  75         mutex_lock(&acm_table_lock);
  76         acm = acm_table[index];
  77         if (acm) {
  78                 mutex_lock(&acm->mutex);
  79                 if (acm->disconnected) {
  80                         mutex_unlock(&acm->mutex);
  81                         acm = NULL;
  82                 } else {
  83                         tty_port_get(&acm->port);
  84                         mutex_unlock(&acm->mutex);
  85                 }
  86         }
  87         mutex_unlock(&acm_table_lock);
  88         return acm;
  89 }
  90
  91 /*
  92  * Try to find an available minor number and if found, associate it with 'acm'.
  93  */
  94 static int acm_alloc_minor(struct acm *acm)
  95 {
  96         int minor;
  97
  98         mutex_lock(&acm_table_lock);
  99         for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
 100                 if (!acm_table[minor]) {
 101                         acm_table[minor] = acm;
 102                         break;
 103                 }
 104         }
 105         mutex_unlock(&acm_table_lock);
 106
 107         return minor;
 108 }
 109
 110 /* Release the minor number associated with 'acm'.  */
 111 static void acm_release_minor(struct acm *acm)
 112 {
 113         mutex_lock(&acm_table_lock);
 114         acm_table[acm->minor] = NULL;
 115         mutex_unlock(&acm_table_lock);
 116 }
 117
 118 /*
 119  * Functions for ACM control messages.
 120  */
 121
 122 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 123                                                         void *buf, int len)
 124 {
 125         int retval;
 126
 127         retval = usb_autopm_get_interface(acm->control);
 128         if (retval)
 129                 return retval;
 130
 131         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 132                 request, USB_RT_ACM, value,
 133                 acm->control->altsetting[0].desc.bInterfaceNumber,
 134                 buf, len, 5000);
 135
 136         dev_dbg(&acm->control->dev,
 137                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 138                         __func__, request, value, len, retval);
 139
 140         usb_autopm_put_interface(acm->control);
 141
 142         return retval < 0 ? retval : 0;
 143 }
 144
 145 /* devices aren't required to support these requests.
 146  * the cdc acm descriptor tells whether they do...
 147  */
 148 #define acm_set_control(acm, control) \
 149         acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
 150 #define acm_set_line(acm, line) \
 151         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 152 #define acm_send_break(acm, ms) \
 153         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 154
 155 /*
 156  * Write buffer management.
 157  * All of these assume proper locks taken by the caller.
 158  */
 159
 160 static int acm_wb_alloc(struct acm *acm)
 161 {
 162         int i, wbn;
 163         struct acm_wb *wb;
 164
 165         wbn = 0;
 166         i = 0;
 167         for (;;) {
 168                 wb = &acm->wb[wbn];
 169                 if (!wb->use) {
 170                         wb->use = 1;
 171                         return wbn;
 172                 }
 173                 wbn = (wbn + 1) % ACM_NW;
 174                 if (++i >= ACM_NW)
 175                         return -1;
 176         }
 177 }
 178
 179 static int acm_wb_is_avail(struct acm *acm)
 180 {
 181         int i, n;
 182         unsigned long flags;
 183
 184         n = ACM_NW;
 185         spin_lock_irqsave(&acm->write_lock, flags);
 186         for (i = 0; i < ACM_NW; i++)
 187                 n -= acm->wb[i].use;
 188         spin_unlock_irqrestore(&acm->write_lock, flags);
 189         return n;
 190 }
 191
 192 /*
 193  * Finish write. Caller must hold acm->write_lock
 194  */
 195 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 196 {
 197         wb->use = 0;
 198         acm->transmitting--;
 199         usb_autopm_put_interface_async(acm->control);
 200 }
 201
 202 /*
 203  * Poke write.
 204  *
 205  * the caller is responsible for locking
 206  */
 207
 208 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 209 {
 210         int rc;
 211
 212         acm->transmitting++;
 213
 214         wb->urb->transfer_buffer = wb->buf;
 215         wb->urb->transfer_dma = wb->dmah;
 216         wb->urb->transfer_buffer_length = wb->len;
 217         wb->urb->dev = acm->dev;
 218
 219         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 220         if (rc < 0) {
 221                 dev_err(&acm->data->dev,
 222                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 223                         __func__, rc);
 224                 acm_write_done(acm, wb);
 225         }
 226         return rc;
 227 }
 228
 229 static int acm_write_start(struct acm *acm, int wbn)
 230 {
 231         unsigned long flags;
 232         struct acm_wb *wb = &acm->wb[wbn];
 233         int rc;
 234
 235         spin_lock_irqsave(&acm->write_lock, flags);
 236         if (!acm->dev) {
 237                 wb->use = 0;
 238                 spin_unlock_irqrestore(&acm->write_lock, flags);
 239                 return -ENODEV;
 240         }
 241
 242         dev_vdbg(&acm->data->dev, "%s - susp_count %d\n", __func__,
 243                                                         acm->susp_count);
 244         usb_autopm_get_interface_async(acm->control);
 245         if (acm->susp_count) {
 246                 usb_anchor_urb(wb->urb, &acm->delayed);
 247                 spin_unlock_irqrestore(&acm->write_lock, flags);
 248                 return 0;
 249         }
 250         usb_mark_last_busy(acm->dev);
 251
 252         rc = acm_start_wb(acm, wb);
 253         spin_unlock_irqrestore(&acm->write_lock, flags);
 254
 255         return rc;
 256
 257 }
 258 /*
 259  * attributes exported through sysfs
 260  */
 261 static ssize_t show_caps
 262 (struct device *dev, struct device_attribute *attr, char *buf)
 263 {
 264         struct usb_interface *intf = to_usb_interface(dev);
 265         struct acm *acm = usb_get_intfdata(intf);
 266
 267         return sprintf(buf, "%d", acm->ctrl_caps);
 268 }
 269 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 270
 271 static ssize_t show_country_codes
 272 (struct device *dev, struct device_attribute *attr, char *buf)
 273 {
 274         struct usb_interface *intf = to_usb_interface(dev);
 275         struct acm *acm = usb_get_intfdata(intf);
 276
 277         memcpy(buf, acm->country_codes, acm->country_code_size);
 278         return acm->country_code_size;
 279 }
 280
 281 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 282
 283 static ssize_t show_country_rel_date
 284 (struct device *dev, struct device_attribute *attr, char *buf)
 285 {
 286         struct usb_interface *intf = to_usb_interface(dev);
 287         struct acm *acm = usb_get_intfdata(intf);
 288
 289         return sprintf(buf, "%d", acm->country_rel_date);
 290 }
 291
 292 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 293 /*
 294  * Interrupt handlers for various ACM device responses
 295  */
 296
 297 /* control interface reports status changes with "interrupt" transfers */
 298 static void acm_ctrl_irq(struct urb *urb)
 299 {
 300         struct acm *acm = urb->context;
 301         struct usb_cdc_notification *dr = urb->transfer_buffer;
 302         unsigned char *data;
 303         int newctrl;
 304         int retval;
 305         int status = urb->status;
 306
 307         switch (status) {
 308         case 0:
 309                 /* success */
 310                 break;
 311         case -ECONNRESET:
 312         case -ENOENT:
 313         case -ESHUTDOWN:
 314                 /* this urb is terminated, clean up */
 315                 dev_dbg(&acm->control->dev,
 316                                 "%s - urb shutting down with status: %d\n",
 317                                 __func__, status);
 318                 return;
 319         default:
 320                 dev_dbg(&acm->control->dev,
 321                                 "%s - nonzero urb status received: %d\n",
 322                                 __func__, status);
 323                 goto exit;
 324         }
 325
 326         usb_mark_last_busy(acm->dev);
 327
 328         data = (unsigned char *)(dr + 1);
 329         switch (dr->bNotificationType) {
 330         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 331                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
 332                                                         __func__, dr->wValue);
 333                 break;
 334
 335         case USB_CDC_NOTIFY_SERIAL_STATE:
 336                 newctrl = get_unaligned_le16(data);
 337
 338                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 339                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
 340                                         __func__);
 341                         tty_port_tty_hangup(&acm->port, false);
 342                 }
 343
 344                 acm->ctrlin = newctrl;
 345
 346                 dev_dbg(&acm->control->dev,
 347                         "%s - input control lines: dcd%c dsr%c break%c "
 348                         "ring%c framing%c parity%c overrun%c\n",
 349                         __func__,
 350                         acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
 351                         acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
 352                         acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
 353                         acm->ctrlin & ACM_CTRL_RI  ? '+' : '-',
 354                         acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
 355                         acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
 356                         acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
 357                         break;
 358
 359         default:
 360                 dev_dbg(&acm->control->dev,
 361                         "%s - unknown notification %d received: index %d "
 362                         "len %d data0 %d data1 %d\n",
 363                         __func__,
 364                         dr->bNotificationType, dr->wIndex,
 365                         dr->wLength, data[0], data[1]);
 366                 break;
 367         }
 368 exit:
 369         retval = usb_submit_urb(urb, GFP_ATOMIC);
 370         if (retval)
 371                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 372                                                         __func__, retval);
 373 }
 374
 375 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 376 {
 377         int res;
 378
 379         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 380                 return 0;
 381
 382         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
 383
 384         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 385         if (res) {
 386                 if (res != -EPERM) {
 387                         dev_err(&acm->data->dev,
 388                                         "%s - usb_submit_urb failed: %d\n",
 389                                         __func__, res);
 390                 }
 391                 set_bit(index, &acm->read_urbs_free);
 392                 return res;
 393         }
 394
 395         return 0;
 396 }
 397
 398 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 399 {
 400         int res;
 401         int i;
 402
 403         for (i = 0; i < acm->rx_buflimit; ++i) {
 404                 res = acm_submit_read_urb(acm, i, mem_flags);
 405                 if (res)
 406                         return res;
 407         }
 408
 409         return 0;
 410 }
 411
 412 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 413 {
 414         if (!urb->actual_length)
 415                 return;
 416
 417         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 418                         urb->actual_length);
 419         tty_flip_buffer_push(&acm->port);
 420 }
 421
 422 static void acm_read_bulk_callback(struct urb *urb)
 423 {
 424         struct acm_rb *rb = urb->context;
 425         struct acm *acm = rb->instance;
 426         unsigned long flags;
 427
 428         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
 429                                         rb->index, urb->actual_length);
 430         set_bit(rb->index, &acm->read_urbs_free);
 431
 432         if (!acm->dev) {
 433                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 434                 return;
 435         }
 436         usb_mark_last_busy(acm->dev);
 437
 438         if (urb->status) {
 439                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
 440                                                         __func__, urb->status);
 441                 return;
 442         }
 443         acm_process_read_urb(acm, urb);
 444
 445         /* throttle device if requested by tty */
 446         spin_lock_irqsave(&acm->read_lock, flags);
 447         acm->throttled = acm->throttle_req;
 448         if (!acm->throttled && !acm->susp_count) {
 449                 spin_unlock_irqrestore(&acm->read_lock, flags);
 450                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 451         } else {
 452                 spin_unlock_irqrestore(&acm->read_lock, flags);
 453         }
 454 }
 455
 456 /* data interface wrote those outgoing bytes */
 457 static void acm_write_bulk(struct urb *urb)
 458 {
 459         struct acm_wb *wb = urb->context;
 460         struct acm *acm = wb->instance;
 461         unsigned long flags;
 462
 463         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
 464                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
 465                         __func__,
 466                         urb->actual_length,
 467                         urb->transfer_buffer_length,
 468                         urb->status);
 469
 470         spin_lock_irqsave(&acm->write_lock, flags);
 471         acm_write_done(acm, wb);
 472         spin_unlock_irqrestore(&acm->write_lock, flags);
 473         schedule_work(&acm->work);
 474 }
 475
 476 static void acm_softint(struct work_struct *work)
 477 {
 478         struct acm *acm = container_of(work, struct acm, work);
 479
 480         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 481
 482         tty_port_tty_wakeup(&acm->port);
 483 }
 484
 485 /*
 486  * TTY handlers
 487  */
 488
 489 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 490 {
 491         struct acm *acm;
 492         int retval;
 493
 494         dev_dbg(tty->dev, "%s\n", __func__);
 495
 496         acm = acm_get_by_index(tty->index);
 497         if (!acm)
 498                 return -ENODEV;
 499
 500         retval = tty_standard_install(driver, tty);
 501         if (retval)
 502                 goto error_init_termios;
 503
 504         tty->driver_data = acm;
 505
 506         return 0;
 507
 508 error_init_termios:
 509         tty_port_put(&acm->port);
 510         return retval;
 511 }
 512
 513 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 514 {
 515         struct acm *acm = tty->driver_data;
 516
 517         dev_dbg(tty->dev, "%s\n", __func__);
 518
 519         return tty_port_open(&acm->port, tty, filp);
 520 }
 521
 522 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 523 {
 524         struct acm *acm = container_of(port, struct acm, port);
 525         int retval = -ENODEV;
 526         int i;
 527
 528         dev_dbg(&acm->control->dev, "%s\n", __func__);
 529
 530         mutex_lock(&acm->mutex);
 531         if (acm->disconnected)
 532                 goto disconnected;
 533
 534         retval = usb_autopm_get_interface(acm->control);
 535         if (retval)
 536                 goto error_get_interface;
 537
 538         /*
 539          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 540          * memory is really nasty...
 541          */
 542         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 543         acm->control->needs_remote_wakeup = 1;
 544
 545         acm->ctrlurb->dev = acm->dev;
 546         if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
 547                 dev_err(&acm->control->dev,
 548                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 549                 goto error_submit_urb;
 550         }
 551
 552         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
 553         if (acm_set_control(acm, acm->ctrlout) < 0 &&
 554             (acm->ctrl_caps & USB_CDC_CAP_LINE))
 555                 goto error_set_control;
 556
 557         usb_autopm_put_interface(acm->control);
 558
 559         /*
 560          * Unthrottle device in case the TTY was closed while throttled.
 561          */
 562         spin_lock_irq(&acm->read_lock);
 563         acm->throttled = 0;
 564         acm->throttle_req = 0;
 565         spin_unlock_irq(&acm->read_lock);
 566
 567         if (acm_submit_read_urbs(acm, GFP_KERNEL))
 568                 goto error_submit_read_urbs;
 569
 570         mutex_unlock(&acm->mutex);
 571
 572         return 0;
 573
 574 error_submit_read_urbs:
 575         for (i = 0; i < acm->rx_buflimit; i++)
 576                 usb_kill_urb(acm->read_urbs[i]);
 577         acm->ctrlout = 0;
 578         acm_set_control(acm, acm->ctrlout);
 579 error_set_control:
 580         usb_kill_urb(acm->ctrlurb);
 581 error_submit_urb:
 582         usb_autopm_put_interface(acm->control);
 583 error_get_interface:
 584 disconnected:
 585         mutex_unlock(&acm->mutex);
 586         return retval;
 587 }
 588
 589 static void acm_port_destruct(struct tty_port *port)
 590 {
 591         struct acm *acm = container_of(port, struct acm, port);
 592
 593         dev_dbg(&acm->control->dev, "%s\n", __func__);
 594
 595         acm_release_minor(acm);
 596         usb_put_intf(acm->control);
 597         kfree(acm->country_codes);
 598         kfree(acm);
 599 }
 600
 601 static void acm_port_shutdown(struct tty_port *port)
 602 {
 603         struct acm *acm = container_of(port, struct acm, port);
 604         struct urb *urb;
 605         struct acm_wb *wb;
 606         int i;
 607         int pm_err;
 608
 609         dev_dbg(&acm->control->dev, "%s\n", __func__);
 610
 611         mutex_lock(&acm->mutex);
 612         if (!acm->disconnected) {
 613                 pm_err = usb_autopm_get_interface(acm->control);
 614                 acm_set_control(acm, acm->ctrlout = 0);
 615
 616                 for (;;) {
 617                         urb = usb_get_from_anchor(&acm->delayed);
 618                         if (!urb)
 619                                 break;
 620                         wb = urb->context;
 621                         wb->use = 0;
 622                         usb_autopm_put_interface_async(acm->control);
 623                 }
 624
 625                 usb_kill_urb(acm->ctrlurb);
 626                 for (i = 0; i < ACM_NW; i++)
 627                         usb_kill_urb(acm->wb[i].urb);
 628                 for (i = 0; i < acm->rx_buflimit; i++)
 629                         usb_kill_urb(acm->read_urbs[i]);
 630                 acm->control->needs_remote_wakeup = 0;
 631                 if (!pm_err)
 632                         usb_autopm_put_interface(acm->control);
 633         }
 634         mutex_unlock(&acm->mutex);
 635 }
 636
 637 static void acm_tty_cleanup(struct tty_struct *tty)
 638 {
 639         struct acm *acm = tty->driver_data;
 640         dev_dbg(&acm->control->dev, "%s\n", __func__);
 641         tty_port_put(&acm->port);
 642 }
 643
 644 static void acm_tty_hangup(struct tty_struct *tty)
 645 {
 646         struct acm *acm = tty->driver_data;
 647         dev_dbg(&acm->control->dev, "%s\n", __func__);
 648         tty_port_hangup(&acm->port);
 649 }
 650
 651 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 652 {
 653         struct acm *acm = tty->driver_data;
 654         dev_dbg(&acm->control->dev, "%s\n", __func__);
 655         tty_port_close(&acm->port, tty, filp);
 656 }
 657
 658 static int acm_tty_write(struct tty_struct *tty,
 659                                         const unsigned char *buf, int count)
 660 {
 661         struct acm *acm = tty->driver_data;
 662         int stat;
 663         unsigned long flags;
 664         int wbn;
 665         struct acm_wb *wb;
 666
 667         if (!count)
 668                 return 0;
 669
 670         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 671
 672         spin_lock_irqsave(&acm->write_lock, flags);
 673         wbn = acm_wb_alloc(acm);
 674         if (wbn < 0) {
 675                 spin_unlock_irqrestore(&acm->write_lock, flags);
 676                 return 0;
 677         }
 678         wb = &acm->wb[wbn];
 679
 680         count = (count > acm->writesize) ? acm->writesize : count;
 681         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 682         memcpy(wb->buf, buf, count);
 683         wb->len = count;
 684         spin_unlock_irqrestore(&acm->write_lock, flags);
 685
 686         stat = acm_write_start(acm, wbn);
 687         if (stat < 0)
 688                 return stat;
 689         return count;
 690 }
 691
 692 static int acm_tty_write_room(struct tty_struct *tty)
 693 {
 694         struct acm *acm = tty->driver_data;
 695         /*
 696          * Do not let the line discipline to know that we have a reserve,
 697          * or it might get too enthusiastic.
 698          */
 699         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 700 }
 701
 702 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 703 {
 704         struct acm *acm = tty->driver_data;
 705         /*
 706          * if the device was unplugged then any remaining characters fell out
 707          * of the connector ;)
 708          */
 709         if (acm->disconnected)
 710                 return 0;
 711         /*
 712          * This is inaccurate (overcounts), but it works.
 713          */
 714         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 715 }
 716
 717 static void acm_tty_throttle(struct tty_struct *tty)
 718 {
 719         struct acm *acm = tty->driver_data;
 720
 721         spin_lock_irq(&acm->read_lock);
 722         acm->throttle_req = 1;
 723         spin_unlock_irq(&acm->read_lock);
 724 }
 725
 726 static void acm_tty_unthrottle(struct tty_struct *tty)
 727 {
 728         struct acm *acm = tty->driver_data;
 729         unsigned int was_throttled;
 730
 731         spin_lock_irq(&acm->read_lock);
 732         was_throttled = acm->throttled;
 733         acm->throttled = 0;
 734         acm->throttle_req = 0;
 735         spin_unlock_irq(&acm->read_lock);
 736
 737         if (was_throttled)
 738                 acm_submit_read_urbs(acm, GFP_KERNEL);
 739 }
 740
 741 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 742 {
 743         struct acm *acm = tty->driver_data;
 744         int retval;
 745
 746         retval = acm_send_break(acm, state ? 0xffff : 0);
 747         if (retval < 0)
 748                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 749                                                                 __func__);
 750         return retval;
 751 }
 752
 753 static int acm_tty_tiocmget(struct tty_struct *tty)
 754 {
 755         struct acm *acm = tty->driver_data;
 756
 757         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 758                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 759                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 760                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 761                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 762                TIOCM_CTS;
 763 }
 764
 765 static int acm_tty_tiocmset(struct tty_struct *tty,
 766                             unsigned int set, unsigned int clear)
 767 {
 768         struct acm *acm = tty->driver_data;
 769         unsigned int newctrl;
 770
 771         newctrl = acm->ctrlout;
 772         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 773                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 774         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 775                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 776
 777         newctrl = (newctrl & ~clear) | set;
 778
 779         if (acm->ctrlout == newctrl)
 780                 return 0;
 781         return acm_set_control(acm, acm->ctrlout = newctrl);
 782 }
 783
 784 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 785 {
 786         struct serial_struct tmp;
 787
 788         if (!info)
 789                 return -EINVAL;
 790
 791         memset(&tmp, 0, sizeof(tmp));
 792         tmp.flags = ASYNC_LOW_LATENCY;
 793         tmp.xmit_fifo_size = acm->writesize;
 794         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 795         tmp.close_delay = acm->port.close_delay / 10;
 796         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 797                                 ASYNC_CLOSING_WAIT_NONE :
 798                                 acm->port.closing_wait / 10;
 799
 800         if (copy_to_user(info, &tmp, sizeof(tmp)))
 801                 return -EFAULT;
 802         else
 803                 return 0;
 804 }
 805
 806 static int set_serial_info(struct acm *acm,
 807                                 struct serial_struct __user *newinfo)
 808 {
 809         struct serial_struct new_serial;
 810         unsigned int closing_wait, close_delay;
 811         int retval = 0;
 812
 813         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 814                 return -EFAULT;
 815
 816         close_delay = new_serial.close_delay * 10;
 817         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 818                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 819
 820         mutex_lock(&acm->port.mutex);
 821
 822         if (!capable(CAP_SYS_ADMIN)) {
 823                 if ((close_delay != acm->port.close_delay) ||
 824                     (closing_wait != acm->port.closing_wait))
 825                         retval = -EPERM;
 826                 else
 827                         retval = -EOPNOTSUPP;
 828         } else {
 829                 acm->port.close_delay  = close_delay;
 830                 acm->port.closing_wait = closing_wait;
 831         }
 832
 833         mutex_unlock(&acm->port.mutex);
 834         return retval;
 835 }
 836
 837 static int acm_tty_ioctl(struct tty_struct *tty,
 838                                         unsigned int cmd, unsigned long arg)
 839 {
 840         struct acm *acm = tty->driver_data;
 841         int rv = -ENOIOCTLCMD;
 842
 843         switch (cmd) {
 844         case TIOCGSERIAL: /* gets serial port data */
 845                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 846                 break;
 847         case TIOCSSERIAL:
 848                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 849                 break;
 850         }
 851
 852         return rv;
 853 }
 854
 855 static void acm_tty_set_termios(struct tty_struct *tty,
 856                                                 struct ktermios *termios_old)
 857 {
 858         struct acm *acm = tty->driver_data;
 859         struct ktermios *termios = &tty->termios;
 860         struct usb_cdc_line_coding newline;
 861         int newctrl = acm->ctrlout;
 862
 863         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 864         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 865         newline.bParityType = termios->c_cflag & PARENB ?
 866                                 (termios->c_cflag & PARODD ? 1 : 2) +
 867                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 868         switch (termios->c_cflag & CSIZE) {
 869         case CS5:
 870                 newline.bDataBits = 5;
 871                 break;
 872         case CS6:
 873                 newline.bDataBits = 6;
 874                 break;
 875         case CS7:
 876                 newline.bDataBits = 7;
 877                 break;
 878         case CS8:
 879         default:
 880                 newline.bDataBits = 8;
 881                 break;
 882         }
 883         /* FIXME: Needs to clear unsupported bits in the termios */
 884         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 885
 886         if (C_BAUD(tty) == B0) {
 887                 newline.dwDTERate = acm->line.dwDTERate;
 888                 newctrl &= ~ACM_CTRL_DTR;
 889         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
 890                 newctrl |=  ACM_CTRL_DTR;
 891         }
 892
 893         if (newctrl != acm->ctrlout)
 894                 acm_set_control(acm, acm->ctrlout = newctrl);
 895
 896         if (memcmp(&acm->line, &newline, sizeof newline)) {
 897                 memcpy(&acm->line, &newline, sizeof newline);
 898                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 899                         __func__,
 900                         le32_to_cpu(newline.dwDTERate),
 901                         newline.bCharFormat, newline.bParityType,
 902                         newline.bDataBits);
 903                 acm_set_line(acm, &acm->line);
 904         }
 905 }
 906
 907 static const struct tty_port_operations acm_port_ops = {
 908         .shutdown = acm_port_shutdown,
 909         .activate = acm_port_activate,
 910         .destruct = acm_port_destruct,
 911 };
 912
 913 /*
 914  * USB probe and disconnect routines.
 915  */
 916
 917 /* Little helpers: write/read buffers free */
 918 static void acm_write_buffers_free(struct acm *acm)
 919 {
 920         int i;
 921         struct acm_wb *wb;
 922         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 923
 924         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
 925                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
 926 }
 927
 928 static void acm_read_buffers_free(struct acm *acm)
 929 {
 930         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 931         int i;
 932
 933         for (i = 0; i < acm->rx_buflimit; i++)
 934                 usb_free_coherent(usb_dev, acm->readsize,
 935                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
 936 }
 937
 938 /* Little helper: write buffers allocate */
 939 static int acm_write_buffers_alloc(struct acm *acm)
 940 {
 941         int i;
 942         struct acm_wb *wb;
 943
 944         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
 945                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
 946                     &wb->dmah);
 947                 if (!wb->buf) {
 948                         while (i != 0) {
 949                                 --i;
 950                                 --wb;
 951                                 usb_free_coherent(acm->dev, acm->writesize,
 952                                     wb->buf, wb->dmah);
 953                         }
 954                         return -ENOMEM;
 955                 }
 956         }
 957         return 0;
 958 }
 959
 960 static int acm_probe(struct usb_interface *intf,
 961                      const struct usb_device_id *id)
 962 {
 963         struct usb_cdc_union_desc *union_header = NULL;
 964         struct usb_cdc_country_functional_desc *cfd = NULL;
 965         unsigned char *buffer = intf->altsetting->extra;
 966         int buflen = intf->altsetting->extralen;
 967         struct usb_interface *control_interface;
 968         struct usb_interface *data_interface;
 969         struct usb_endpoint_descriptor *epctrl = NULL;
 970         struct usb_endpoint_descriptor *epread = NULL;
 971         struct usb_endpoint_descriptor *epwrite = NULL;
 972         struct usb_device *usb_dev = interface_to_usbdev(intf);
 973         struct acm *acm;
 974         int minor;
 975         int ctrlsize, readsize;
 976         u8 *buf;
 977         u8 ac_management_function = 0;
 978         u8 call_management_function = 0;
 979         int call_interface_num = -1;
 980         int data_interface_num = -1;
 981         unsigned long quirks;
 982         int num_rx_buf;
 983         int i;
 984         int combined_interfaces = 0;
 985         struct device *tty_dev;
 986         int rv = -ENOMEM;
 987
 988         /* normal quirks */
 989         quirks = (unsigned long)id->driver_info;
 990
 991         if (quirks == IGNORE_DEVICE)
 992                 return -ENODEV;
 993
 994         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
 995
 996         /* handle quirks deadly to normal probing*/
 997         if (quirks == NO_UNION_NORMAL) {
 998                 data_interface = usb_ifnum_to_if(usb_dev, 1);
 999                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1000                 goto skip_normal_probe;
1001         }
1002
1003         /* normal probing*/
1004         if (!buffer) {
1005                 dev_err(&intf->dev, "Weird descriptor references\n");
1006                 return -EINVAL;
1007         }
1008
1009         if (!buflen) {
1010                 if (intf->cur_altsetting->endpoint &&
1011                                 intf->cur_altsetting->endpoint->extralen &&
1012                                 intf->cur_altsetting->endpoint->extra) {
1013                         dev_dbg(&intf->dev,
1014                                 "Seeking extra descriptors on endpoint\n");
1015                         buflen = intf->cur_altsetting->endpoint->extralen;
1016                         buffer = intf->cur_altsetting->endpoint->extra;
1017                 } else {
1018                         dev_err(&intf->dev,
1019                                 "Zero length descriptor references\n");
1020                         return -EINVAL;
1021                 }
1022         }
1023
1024         while (buflen > 0) {
1025                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1026                         dev_err(&intf->dev, "skipping garbage\n");
1027                         goto next_desc;
1028                 }
1029
1030                 switch (buffer[2]) {
1031                 case USB_CDC_UNION_TYPE: /* we've found it */
1032                         if (union_header) {
1033                                 dev_err(&intf->dev, "More than one "
1034                                         "union descriptor, skipping ...\n");
1035                                 goto next_desc;
1036                         }
1037                         union_header = (struct usb_cdc_union_desc *)buffer;
1038                         break;
1039                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1040                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1041                         break;
1042                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1043                         break; /* for now we ignore it */
1044                 case USB_CDC_ACM_TYPE:
1045                         ac_management_function = buffer[3];
1046                         break;
1047                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1048                         call_management_function = buffer[3];
1049                         call_interface_num = buffer[4];
1050                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1051                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1052                         break;
1053                 default:
1054                         /* there are LOTS more CDC descriptors that
1055                          * could legitimately be found here.
1056                          */
1057                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1058                                         "type %02x, length %d\n",
1059                                         buffer[2], buffer[0]);
1060                         break;
1061                 }
1062 next_desc:
1063                 buflen -= buffer[0];
1064                 buffer += buffer[0];
1065         }
1066
1067         if (!union_header) {
1068                 if (call_interface_num > 0) {
1069                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1070                         /* quirks for Droids MuIn LCD */
1071                         if (quirks & NO_DATA_INTERFACE)
1072                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1073                         else
1074                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1075                         control_interface = intf;
1076                 } else {
1077                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1078                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1079                                 return -ENODEV;
1080                         } else {
1081                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1082                                 combined_interfaces = 1;
1083                                 control_interface = data_interface = intf;
1084                                 goto look_for_collapsed_interface;
1085                         }
1086                 }
1087         } else {
1088                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1089                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1090         }
1091
1092         if (!control_interface || !data_interface) {
1093                 dev_dbg(&intf->dev, "no interfaces\n");
1094                 return -ENODEV;
1095         }
1096
1097         if (data_interface_num != call_interface_num)
1098                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1099
1100         if (control_interface == data_interface) {
1101                 /* some broken devices designed for windows work this way */
1102                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1103                 combined_interfaces = 1;
1104                 /* a popular other OS doesn't use it */
1105                 quirks |= NO_CAP_LINE;
1106                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1107                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1108                         return -EINVAL;
1109                 }
1110 look_for_collapsed_interface:
1111                 for (i = 0; i < 3; i++) {
1112                         struct usb_endpoint_descriptor *ep;
1113                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1114
1115                         if (usb_endpoint_is_int_in(ep))
1116                                 epctrl = ep;
1117                         else if (usb_endpoint_is_bulk_out(ep))
1118                                 epwrite = ep;
1119                         else if (usb_endpoint_is_bulk_in(ep))
1120                                 epread = ep;
1121                         else
1122                                 return -EINVAL;
1123                 }
1124                 if (!epctrl || !epread || !epwrite)
1125                         return -ENODEV;
1126                 else
1127                         goto made_compressed_probe;
1128         }
1129
1130 skip_normal_probe:
1131
1132         /*workaround for switched interfaces */
1133         if (data_interface->cur_altsetting->desc.bInterfaceClass
1134                                                 != CDC_DATA_INTERFACE_TYPE) {
1135                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1136                                                 == CDC_DATA_INTERFACE_TYPE) {
1137                         struct usb_interface *t;
1138                         dev_dbg(&intf->dev,
1139                                 "Your device has switched interfaces.\n");
1140                         t = control_interface;
1141                         control_interface = data_interface;
1142                         data_interface = t;
1143                 } else {
1144                         return -EINVAL;
1145                 }
1146         }
1147
1148         /* Accept probe requests only for the control interface */
1149         if (!combined_interfaces && intf != control_interface)
1150                 return -ENODEV;
1151
1152         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1153                 /* valid in this context */
1154                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1155                 return -EBUSY;
1156         }
1157
1158
1159         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1160             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1161                 return -EINVAL;
1162
1163         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1164         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1165         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1166
1167
1168         /* workaround for switched endpoints */
1169         if (!usb_endpoint_dir_in(epread)) {
1170                 /* descriptors are swapped */
1171                 struct usb_endpoint_descriptor *t;
1172                 dev_dbg(&intf->dev,
1173                         "The data interface has switched endpoints\n");
1174                 t = epread;
1175                 epread = epwrite;
1176                 epwrite = t;
1177         }
1178 made_compressed_probe:
1179         dev_dbg(&intf->dev, "interfaces are valid\n");
1180
1181         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1182         if (acm == NULL) {
1183                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1184                 goto alloc_fail;
1185         }
1186
1187         minor = acm_alloc_minor(acm);
1188         if (minor == ACM_TTY_MINORS) {
1189                 dev_err(&intf->dev, "no more free acm devices\n");
1190                 kfree(acm);
1191                 return -ENODEV;
1192         }
1193
1194         ctrlsize = usb_endpoint_maxp(epctrl);
1195         readsize = usb_endpoint_maxp(epread) *
1196                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1197         acm->combined_interfaces = combined_interfaces;
1198         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1199         acm->control = control_interface;
1200         acm->data = data_interface;
1201         acm->minor = minor;
1202         acm->dev = usb_dev;
1203         acm->ctrl_caps = ac_management_function;
1204         if (quirks & NO_CAP_LINE)
1205                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1206         acm->ctrlsize = ctrlsize;
1207         acm->readsize = readsize;
1208         acm->rx_buflimit = num_rx_buf;
1209         INIT_WORK(&acm->work, acm_softint);
1210         spin_lock_init(&acm->write_lock);
1211         spin_lock_init(&acm->read_lock);
1212         mutex_init(&acm->mutex);
1213         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1214         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1215         if (acm->is_int_ep)
1216                 acm->bInterval = epread->bInterval;
1217         tty_port_init(&acm->port);
1218         acm->port.ops = &acm_port_ops;
1219         init_usb_anchor(&acm->delayed);
1220
1221         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1222         if (!buf) {
1223                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1224                 goto alloc_fail2;
1225         }
1226         acm->ctrl_buffer = buf;
1227
1228         if (acm_write_buffers_alloc(acm) < 0) {
1229                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1230                 goto alloc_fail4;
1231         }
1232
1233         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1234         if (!acm->ctrlurb) {
1235                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1236                 goto alloc_fail5;
1237         }
1238         for (i = 0; i < num_rx_buf; i++) {
1239                 struct acm_rb *rb = &(acm->read_buffers[i]);
1240                 struct urb *urb;
1241
1242                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1243                                                                 &rb->dma);
1244                 if (!rb->base) {
1245                         dev_err(&intf->dev, "out of memory "
1246                                         "(read bufs usb_alloc_coherent)\n");
1247                         goto alloc_fail6;
1248                 }
1249                 rb->index = i;
1250                 rb->instance = acm;
1251
1252                 urb = usb_alloc_urb(0, GFP_KERNEL);
1253                 if (!urb) {
1254                         dev_err(&intf->dev,
1255                                 "out of memory (read urbs usb_alloc_urb)\n");
1256                         goto alloc_fail6;
1257                 }
1258                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1259                 urb->transfer_dma = rb->dma;
1260                 if (acm->is_int_ep) {
1261                         usb_fill_int_urb(urb, acm->dev,
1262                                          acm->rx_endpoint,
1263                                          rb->base,
1264                                          acm->readsize,
1265                                          acm_read_bulk_callback, rb,
1266                                          acm->bInterval);
1267                 } else {
1268                         usb_fill_bulk_urb(urb, acm->dev,
1269                                           acm->rx_endpoint,
1270                                           rb->base,
1271                                           acm->readsize,
1272                                           acm_read_bulk_callback, rb);
1273                 }
1274
1275                 acm->read_urbs[i] = urb;
1276                 __set_bit(i, &acm->read_urbs_free);
1277         }
1278         for (i = 0; i < ACM_NW; i++) {
1279                 struct acm_wb *snd = &(acm->wb[i]);
1280
1281                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1282                 if (snd->urb == NULL) {
1283                         dev_err(&intf->dev,
1284                                 "out of memory (write urbs usb_alloc_urb)\n");
1285                         goto alloc_fail7;
1286                 }
1287
1288                 if (usb_endpoint_xfer_int(epwrite))
1289                         usb_fill_int_urb(snd->urb, usb_dev,
1290                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1291                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1292                 else
1293                         usb_fill_bulk_urb(snd->urb, usb_dev,
1294                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1295                                 NULL, acm->writesize, acm_write_bulk, snd);
1296                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1297                 snd->instance = acm;
1298         }
1299
1300         usb_set_intfdata(intf, acm);
1301
1302         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1303         if (i < 0)
1304                 goto alloc_fail7;
1305
1306         if (cfd) { /* export the country data */
1307                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1308                 if (!acm->country_codes)
1309                         goto skip_countries;
1310                 acm->country_code_size = cfd->bLength - 4;
1311                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1312                                                         cfd->bLength - 4);
1313                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1314
1315                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1316                 if (i < 0) {
1317                         kfree(acm->country_codes);
1318                         acm->country_codes = NULL;
1319                         acm->country_code_size = 0;
1320                         goto skip_countries;
1321                 }
1322
1323                 i = device_create_file(&intf->dev,
1324                                                 &dev_attr_iCountryCodeRelDate);
1325                 if (i < 0) {
1326                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1327                         kfree(acm->country_codes);
1328                         acm->country_codes = NULL;
1329                         acm->country_code_size = 0;
1330                         goto skip_countries;
1331                 }
1332         }
1333
1334 skip_countries:
1335         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1336                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1337                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1338                          /* works around buggy devices */
1339                          epctrl->bInterval ? epctrl->bInterval : 0xff);
1340         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1341         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1342
1343         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1344
1345         acm_set_control(acm, acm->ctrlout);
1346
1347         acm->line.dwDTERate = cpu_to_le32(9600);
1348         acm->line.bDataBits = 8;
1349         acm_set_line(acm, &acm->line);
1350
1351         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1352         usb_set_intfdata(data_interface, acm);
1353
1354         usb_get_intf(control_interface);
1355         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1356                         &control_interface->dev);
1357         if (IS_ERR(tty_dev)) {
1358                 rv = PTR_ERR(tty_dev);
1359                 goto alloc_fail8;
1360         }
1361
1362         return 0;
1363 alloc_fail8:
1364         if (acm->country_codes) {
1365                 device_remove_file(&acm->control->dev,
1366                                 &dev_attr_wCountryCodes);
1367                 device_remove_file(&acm->control->dev,
1368                                 &dev_attr_iCountryCodeRelDate);
1369         }
1370         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1371 alloc_fail7:
1372         usb_set_intfdata(intf, NULL);
1373         for (i = 0; i < ACM_NW; i++)
1374                 usb_free_urb(acm->wb[i].urb);
1375 alloc_fail6:
1376         for (i = 0; i < num_rx_buf; i++)
1377                 usb_free_urb(acm->read_urbs[i]);
1378         acm_read_buffers_free(acm);
1379         usb_free_urb(acm->ctrlurb);
1380 alloc_fail5:
1381         acm_write_buffers_free(acm);
1382 alloc_fail4:
1383         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1384 alloc_fail2:
1385         acm_release_minor(acm);
1386         kfree(acm);
1387 alloc_fail:
1388         return rv;
1389 }
1390
1391 static void stop_data_traffic(struct acm *acm)
1392 {
1393         int i;
1394
1395         dev_dbg(&acm->control->dev, "%s\n", __func__);
1396
1397         usb_kill_urb(acm->ctrlurb);
1398         for (i = 0; i < ACM_NW; i++)
1399                 usb_kill_urb(acm->wb[i].urb);
1400         for (i = 0; i < acm->rx_buflimit; i++)
1401                 usb_kill_urb(acm->read_urbs[i]);
1402
1403         cancel_work_sync(&acm->work);
1404 }
1405
1406 static void acm_disconnect(struct usb_interface *intf)
1407 {
1408         struct acm *acm = usb_get_intfdata(intf);
1409         struct usb_device *usb_dev = interface_to_usbdev(intf);
1410         struct tty_struct *tty;
1411         int i;
1412
1413         dev_dbg(&intf->dev, "%s\n", __func__);
1414
1415         /* sibling interface is already cleaning up */
1416         if (!acm)
1417                 return;
1418
1419         mutex_lock(&acm->mutex);
1420         acm->disconnected = true;
1421         if (acm->country_codes) {
1422                 device_remove_file(&acm->control->dev,
1423                                 &dev_attr_wCountryCodes);
1424                 device_remove_file(&acm->control->dev,
1425                                 &dev_attr_iCountryCodeRelDate);
1426         }
1427         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1428         usb_set_intfdata(acm->control, NULL);
1429         usb_set_intfdata(acm->data, NULL);
1430         mutex_unlock(&acm->mutex);
1431
1432         tty = tty_port_tty_get(&acm->port);
1433         if (tty) {
1434                 tty_vhangup(tty);
1435                 tty_kref_put(tty);
1436         }
1437
1438         stop_data_traffic(acm);
1439
1440         tty_unregister_device(acm_tty_driver, acm->minor);
1441
1442         usb_free_urb(acm->ctrlurb);
1443         for (i = 0; i < ACM_NW; i++)
1444                 usb_free_urb(acm->wb[i].urb);
1445         for (i = 0; i < acm->rx_buflimit; i++)
1446                 usb_free_urb(acm->read_urbs[i]);
1447         acm_write_buffers_free(acm);
1448         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1449         acm_read_buffers_free(acm);
1450
1451         if (!acm->combined_interfaces)
1452                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1453                                         acm->data : acm->control);
1454
1455         tty_port_put(&acm->port);
1456 }
1457
1458 #ifdef CONFIG_PM
1459 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1460 {
1461         struct acm *acm = usb_get_intfdata(intf);
1462         int cnt;
1463
1464         spin_lock_irq(&acm->read_lock);
1465         spin_lock(&acm->write_lock);
1466         if (PMSG_IS_AUTO(message)) {
1467                 if (acm->transmitting) {
1468                         spin_unlock(&acm->write_lock);
1469                         spin_unlock_irq(&acm->read_lock);
1470                         return -EBUSY;
1471                 }
1472         }
1473         cnt = acm->susp_count++;
1474         spin_unlock(&acm->write_lock);
1475         spin_unlock_irq(&acm->read_lock);
1476
1477         if (cnt)
1478                 return 0;
1479
1480         stop_data_traffic(acm);
1481
1482         return 0;
1483 }
1484
1485 static int acm_resume(struct usb_interface *intf)
1486 {
1487         struct acm *acm = usb_get_intfdata(intf);
1488         struct urb *urb;
1489         int rv = 0;
1490
1491         spin_lock_irq(&acm->read_lock);
1492         spin_lock(&acm->write_lock);
1493
1494         if (--acm->susp_count)
1495                 goto out;
1496
1497         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1498                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1499
1500                 for (;;) {
1501                         urb = usb_get_from_anchor(&acm->delayed);
1502                         if (!urb)
1503                                 break;
1504
1505                         acm_start_wb(acm, urb->context);
1506                 }
1507
1508                 /*
1509                  * delayed error checking because we must
1510                  * do the write path at all cost
1511                  */
1512                 if (rv < 0)
1513                         goto out;
1514
1515                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1516         }
1517 out:
1518         spin_unlock(&acm->write_lock);
1519         spin_unlock_irq(&acm->read_lock);
1520
1521         return rv;
1522 }
1523
1524 static int acm_reset_resume(struct usb_interface *intf)
1525 {
1526         struct acm *acm = usb_get_intfdata(intf);
1527
1528         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1529                 tty_port_tty_hangup(&acm->port, false);
1530
1531         return acm_resume(intf);
1532 }
1533
1534 #endif /* CONFIG_PM */
1535
1536 #define NOKIA_PCSUITE_ACM_INFO(x) \
1537                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1538                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1539                 USB_CDC_ACM_PROTO_VENDOR)
1540
1541 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1542                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1543                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1544                 USB_CDC_ACM_PROTO_VENDOR)
1545
1546 /*
1547  * USB driver structure.
1548  */
1549
1550 static const struct usb_device_id acm_ids[] = {
1551         /* quirky and broken devices */
1552         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1553         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1554         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1555         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1556         },
1557         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1558         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1559         },
1560         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1561         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1562         },
1563         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1564         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1565         },
1566         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1567         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1568         },
1569         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1570         .driver_info = SINGLE_RX_URB,
1571         },
1572         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1573         .driver_info = SINGLE_RX_URB, /* firmware bug */
1574         },
1575         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1576         .driver_info = SINGLE_RX_URB, /* firmware bug */
1577         },
1578         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1579         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1580         },
1581         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1582         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1583         },
1584         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1585         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1586         },
1587         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1588         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1589         },
1590         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1591         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1592         },
1593         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1594         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1595         },
1596         /* Motorola H24 HSPA module: */
1597         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1598         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1599         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1600         },
1601         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1602         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1603         },
1604         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1605         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1606         },
1607         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1608         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1609         },
1610         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1611         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1612         },
1613         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1614         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1615         },
1616         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1617         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1618         },
1619
1620         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1621         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1622                                            data interface instead of
1623                                            communications interface.
1624                                            Maybe we should define a new
1625                                            quirk for this. */
1626         },
1627         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1628         .driver_info = NO_UNION_NORMAL,
1629         },
1630         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1631         .driver_info = NO_UNION_NORMAL,
1632         },
1633         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1634         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1635         },
1636         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1637         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1638         },
1639
1640         /* Nokia S60 phones expose two ACM channels. The first is
1641          * a modem and is picked up by the standard AT-command
1642          * information below. The second is 'vendor-specific' but
1643          * is treated as a serial device at the S60 end, so we want
1644          * to expose it on Linux too. */
1645         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1646         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1647         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1648         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1649         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1650         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1651         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1652         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1653         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1654         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1655         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1656         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1657         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1658         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1659         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1660         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1661         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1662         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1663         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1664         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1665         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1666         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1667         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1668         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1669         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1670         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1671         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1672         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1673         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1674         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1675         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1676         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1677         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1678         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1679         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1680         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1681         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1682         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1683         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1684         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1685         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1686         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1687         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1688         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1689         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1690         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1691         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1692         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1693         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1694         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1695         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1696         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1697         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1698         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1699         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1700         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1701         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1702         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1703
1704         /* Support for Owen devices */
1705         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1706
1707         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1708
1709         /* Support Lego NXT using pbLua firmware */
1710         { USB_DEVICE(0x0694, 0xff00),
1711         .driver_info = NOT_A_MODEM,
1712         },
1713
1714         /* Support for Droids MuIn LCD */
1715         { USB_DEVICE(0x04d8, 0x000b),
1716         .driver_info = NO_DATA_INTERFACE,
1717         },
1718
1719 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1720         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1721         .driver_info = IGNORE_DEVICE,
1722         },
1723         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1724         .driver_info = IGNORE_DEVICE,
1725         },
1726 #endif
1727
1728         /* control interfaces without any protocol set */
1729         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1730                 USB_CDC_PROTO_NONE) },
1731
1732         /* control interfaces with various AT-command sets */
1733         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1734                 USB_CDC_ACM_PROTO_AT_V25TER) },
1735         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1736                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1737         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1738                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1739         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1740                 USB_CDC_ACM_PROTO_AT_GSM) },
1741         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1742                 USB_CDC_ACM_PROTO_AT_3G) },
1743         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1744                 USB_CDC_ACM_PROTO_AT_CDMA) },
1745
1746         { }
1747 };
1748
1749 MODULE_DEVICE_TABLE(usb, acm_ids);
1750
1751 static struct usb_driver acm_driver = {
1752         .name =         "cdc_acm",
1753         .probe =        acm_probe,
1754         .disconnect =   acm_disconnect,
1755 #ifdef CONFIG_PM
1756         .suspend =      acm_suspend,
1757         .resume =       acm_resume,
1758         .reset_resume = acm_reset_resume,
1759 #endif
1760         .id_table =     acm_ids,
1761 #ifdef CONFIG_PM
1762         .supports_autosuspend = 1,
1763 #endif
1764         .disable_hub_initiated_lpm = 1,
1765 };
1766
1767 /*
1768  * TTY driver structures.
1769  */
1770
1771 static const struct tty_operations acm_ops = {
1772         .install =              acm_tty_install,
1773         .open =                 acm_tty_open,
1774         .close =                acm_tty_close,
1775         .cleanup =              acm_tty_cleanup,
1776         .hangup =               acm_tty_hangup,
1777         .write =                acm_tty_write,
1778         .write_room =           acm_tty_write_room,
1779         .ioctl =                acm_tty_ioctl,
1780         .throttle =             acm_tty_throttle,
1781         .unthrottle =           acm_tty_unthrottle,
1782         .chars_in_buffer =      acm_tty_chars_in_buffer,
1783         .break_ctl =            acm_tty_break_ctl,
1784         .set_termios =          acm_tty_set_termios,
1785         .tiocmget =             acm_tty_tiocmget,
1786         .tiocmset =             acm_tty_tiocmset,
1787 };
1788
1789 /*
1790  * Init / exit.
1791  */
1792
1793 static int __init acm_init(void)
1794 {
1795         int retval;
1796         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1797         if (!acm_tty_driver)
1798                 return -ENOMEM;
1799         acm_tty_driver->driver_name = "acm",
1800         acm_tty_driver->name = "ttyACM",
1801         acm_tty_driver->major = ACM_TTY_MAJOR,
1802         acm_tty_driver->minor_start = 0,
1803         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1804         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1805         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1806         acm_tty_driver->init_termios = tty_std_termios;
1807         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1808                                                                 HUPCL | CLOCAL;
1809         tty_set_operations(acm_tty_driver, &acm_ops);
1810
1811         retval = tty_register_driver(acm_tty_driver);
1812         if (retval) {
1813                 put_tty_driver(acm_tty_driver);
1814                 return retval;
1815         }
1816
1817         retval = usb_register(&acm_driver);
1818         if (retval) {
1819                 tty_unregister_driver(acm_tty_driver);
1820                 put_tty_driver(acm_tty_driver);
1821                 return retval;
1822         }
1823
1824         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1825
1826         return 0;
1827 }
1828
1829 static void __exit acm_exit(void)
1830 {
1831         usb_deregister(&acm_driver);
1832         tty_unregister_driver(acm_tty_driver);
1833         put_tty_driver(acm_tty_driver);
1834 }
1835
1836 module_init(acm_init);
1837 module_exit(acm_exit);
1838
1839 MODULE_AUTHOR(DRIVER_AUTHOR);
1840 MODULE_DESCRIPTION(DRIVER_DESC);
1841 MODULE_LICENSE("GPL");
1842 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);