drivers/usb/class/cdc-acm.c

   1 /*
   2  * cdc-acm.c
   3  *
   4  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
   5  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
   6  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
   7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   8  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
   9  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
  10  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
  11  *
  12  * USB Abstract Control Model driver for USB modems and ISDN adapters
  13  *
  14  * Sponsored by SuSE
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  29  */
  30
  31 #undef DEBUG
  32 #undef VERBOSE_DEBUG
  33
  34 #include <linux/kernel.h>
  35 #include <linux/errno.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/tty.h>
  39 #include <linux/serial.h>
  40 #include <linux/tty_driver.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/module.h>
  43 #include <linux/mutex.h>
  44 #include <linux/uaccess.h>
  45 #include <linux/usb.h>
  46 #include <linux/usb/cdc.h>
  47 #include <asm/byteorder.h>
  48 #include <asm/unaligned.h>
  49 #include <linux/list.h>
  50
  51 #include "cdc-acm.h"
  52
  53
  54 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  55 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  56
  57 static struct usb_driver acm_driver;
  58 static struct tty_driver *acm_tty_driver;
  59 static struct acm *acm_table[ACM_TTY_MINORS];
  60
  61 static DEFINE_MUTEX(acm_table_lock);
  62
  63 /*
  64  * acm_table accessors
  65  */
  66
  67 /*
  68  * Look up an ACM structure by index. If found and not disconnected, increment
  69  * its refcount and return it with its mutex held.
  70  */
  71 static struct acm *acm_get_by_index(unsigned index)
  72 {
  73         struct acm *acm;
  74
  75         mutex_lock(&acm_table_lock);
  76         acm = acm_table[index];
  77         if (acm) {
  78                 mutex_lock(&acm->mutex);
  79                 if (acm->disconnected) {
  80                         mutex_unlock(&acm->mutex);
  81                         acm = NULL;
  82                 } else {
  83                         tty_port_get(&acm->port);
  84                         mutex_unlock(&acm->mutex);
  85                 }
  86         }
  87         mutex_unlock(&acm_table_lock);
  88         return acm;
  89 }
  90
  91 /*
  92  * Try to find an available minor number and if found, associate it with 'acm'.
  93  */
  94 static int acm_alloc_minor(struct acm *acm)
  95 {
  96         int minor;
  97
  98         mutex_lock(&acm_table_lock);
  99         for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
 100                 if (!acm_table[minor]) {
 101                         acm_table[minor] = acm;
 102                         break;
 103                 }
 104         }
 105         mutex_unlock(&acm_table_lock);
 106
 107         return minor;
 108 }
 109
 110 /* Release the minor number associated with 'acm'.  */
 111 static void acm_release_minor(struct acm *acm)
 112 {
 113         mutex_lock(&acm_table_lock);
 114         acm_table[acm->minor] = NULL;
 115         mutex_unlock(&acm_table_lock);
 116 }
 117
 118 /*
 119  * Functions for ACM control messages.
 120  */
 121
 122 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 123                                                         void *buf, int len)
 124 {
 125         int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 126                 request, USB_RT_ACM, value,
 127                 acm->control->altsetting[0].desc.bInterfaceNumber,
 128                 buf, len, 5000);
 129         dev_dbg(&acm->control->dev,
 130                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 131                         __func__, request, value, len, retval);
 132         return retval < 0 ? retval : 0;
 133 }
 134
 135 /* devices aren't required to support these requests.
 136  * the cdc acm descriptor tells whether they do...
 137  */
 138 #define acm_set_control(acm, control) \
 139         acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
 140 #define acm_set_line(acm, line) \
 141         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 142 #define acm_send_break(acm, ms) \
 143         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 144
 145 /*
 146  * Write buffer management.
 147  * All of these assume proper locks taken by the caller.
 148  */
 149
 150 static int acm_wb_alloc(struct acm *acm)
 151 {
 152         int i, wbn;
 153         struct acm_wb *wb;
 154
 155         wbn = 0;
 156         i = 0;
 157         for (;;) {
 158                 wb = &acm->wb[wbn];
 159                 if (!wb->use) {
 160                         wb->use = 1;
 161                         return wbn;
 162                 }
 163                 wbn = (wbn + 1) % ACM_NW;
 164                 if (++i >= ACM_NW)
 165                         return -1;
 166         }
 167 }
 168
 169 static int acm_wb_is_avail(struct acm *acm)
 170 {
 171         int i, n;
 172         unsigned long flags;
 173
 174         n = ACM_NW;
 175         spin_lock_irqsave(&acm->write_lock, flags);
 176         for (i = 0; i < ACM_NW; i++)
 177                 n -= acm->wb[i].use;
 178         spin_unlock_irqrestore(&acm->write_lock, flags);
 179         return n;
 180 }
 181
 182 /*
 183  * Finish write. Caller must hold acm->write_lock
 184  */
 185 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 186 {
 187         wb->use = 0;
 188         acm->transmitting--;
 189         usb_autopm_put_interface_async(acm->control);
 190 }
 191
 192 /*
 193  * Poke write.
 194  *
 195  * the caller is responsible for locking
 196  */
 197
 198 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 199 {
 200         int rc;
 201
 202         acm->transmitting++;
 203
 204         wb->urb->transfer_buffer = wb->buf;
 205         wb->urb->transfer_dma = wb->dmah;
 206         wb->urb->transfer_buffer_length = wb->len;
 207         wb->urb->dev = acm->dev;
 208
 209         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 210         if (rc < 0) {
 211                 dev_err(&acm->data->dev,
 212                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 213                         __func__, rc);
 214                 acm_write_done(acm, wb);
 215         }
 216         return rc;
 217 }
 218
 219 /*
 220  * attributes exported through sysfs
 221  */
 222 static ssize_t show_caps
 223 (struct device *dev, struct device_attribute *attr, char *buf)
 224 {
 225         struct usb_interface *intf = to_usb_interface(dev);
 226         struct acm *acm = usb_get_intfdata(intf);
 227
 228         return sprintf(buf, "%d", acm->ctrl_caps);
 229 }
 230 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 231
 232 static ssize_t show_country_codes
 233 (struct device *dev, struct device_attribute *attr, char *buf)
 234 {
 235         struct usb_interface *intf = to_usb_interface(dev);
 236         struct acm *acm = usb_get_intfdata(intf);
 237
 238         memcpy(buf, acm->country_codes, acm->country_code_size);
 239         return acm->country_code_size;
 240 }
 241
 242 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 243
 244 static ssize_t show_country_rel_date
 245 (struct device *dev, struct device_attribute *attr, char *buf)
 246 {
 247         struct usb_interface *intf = to_usb_interface(dev);
 248         struct acm *acm = usb_get_intfdata(intf);
 249
 250         return sprintf(buf, "%d", acm->country_rel_date);
 251 }
 252
 253 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 254 /*
 255  * Interrupt handlers for various ACM device responses
 256  */
 257
 258 /* control interface reports status changes with "interrupt" transfers */
 259 static void acm_ctrl_irq(struct urb *urb)
 260 {
 261         struct acm *acm = urb->context;
 262         struct usb_cdc_notification *dr = urb->transfer_buffer;
 263         unsigned char *data;
 264         int newctrl;
 265         int difference;
 266         int retval;
 267         int status = urb->status;
 268
 269         switch (status) {
 270         case 0:
 271                 /* success */
 272                 break;
 273         case -ECONNRESET:
 274         case -ENOENT:
 275         case -ESHUTDOWN:
 276                 /* this urb is terminated, clean up */
 277                 dev_dbg(&acm->control->dev,
 278                                 "%s - urb shutting down with status: %d\n",
 279                                 __func__, status);
 280                 return;
 281         default:
 282                 dev_dbg(&acm->control->dev,
 283                                 "%s - nonzero urb status received: %d\n",
 284                                 __func__, status);
 285                 goto exit;
 286         }
 287
 288         usb_mark_last_busy(acm->dev);
 289
 290         data = (unsigned char *)(dr + 1);
 291         switch (dr->bNotificationType) {
 292         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 293                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
 294                                                         __func__, dr->wValue);
 295                 break;
 296
 297         case USB_CDC_NOTIFY_SERIAL_STATE:
 298                 newctrl = get_unaligned_le16(data);
 299
 300                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 301                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
 302                                         __func__);
 303                         tty_port_tty_hangup(&acm->port, false);
 304                 }
 305
 306                 difference = acm->ctrlin ^ newctrl;
 307                 spin_lock(&acm->read_lock);
 308                 acm->ctrlin = newctrl;
 309                 acm->oldcount = acm->iocount;
 310
 311                 if (difference & ACM_CTRL_DSR)
 312                         acm->iocount.dsr++;
 313                 if (difference & ACM_CTRL_BRK)
 314                         acm->iocount.brk++;
 315                 if (difference & ACM_CTRL_RI)
 316                         acm->iocount.rng++;
 317                 if (difference & ACM_CTRL_DCD)
 318                         acm->iocount.dcd++;
 319                 if (difference & ACM_CTRL_FRAMING)
 320                         acm->iocount.frame++;
 321                 if (difference & ACM_CTRL_PARITY)
 322                         acm->iocount.parity++;
 323                 if (difference & ACM_CTRL_OVERRUN)
 324                         acm->iocount.overrun++;
 325                 spin_unlock(&acm->read_lock);
 326
 327                 if (difference)
 328                         wake_up_all(&acm->wioctl);
 329
 330                 break;
 331
 332         default:
 333                 dev_dbg(&acm->control->dev,
 334                         "%s - unknown notification %d received: index %d "
 335                         "len %d data0 %d data1 %d\n",
 336                         __func__,
 337                         dr->bNotificationType, dr->wIndex,
 338                         dr->wLength, data[0], data[1]);
 339                 break;
 340         }
 341 exit:
 342         retval = usb_submit_urb(urb, GFP_ATOMIC);
 343         if (retval)
 344                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 345                                                         __func__, retval);
 346 }
 347
 348 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 349 {
 350         int res;
 351
 352         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 353                 return 0;
 354
 355         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
 356
 357         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 358         if (res) {
 359                 if (res != -EPERM) {
 360                         dev_err(&acm->data->dev,
 361                                         "%s - usb_submit_urb failed: %d\n",
 362                                         __func__, res);
 363                 }
 364                 set_bit(index, &acm->read_urbs_free);
 365                 return res;
 366         }
 367
 368         return 0;
 369 }
 370
 371 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 372 {
 373         int res;
 374         int i;
 375
 376         for (i = 0; i < acm->rx_buflimit; ++i) {
 377                 res = acm_submit_read_urb(acm, i, mem_flags);
 378                 if (res)
 379                         return res;
 380         }
 381
 382         return 0;
 383 }
 384
 385 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 386 {
 387         if (!urb->actual_length)
 388                 return;
 389
 390         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 391                         urb->actual_length);
 392         tty_flip_buffer_push(&acm->port);
 393 }
 394
 395 static void acm_read_bulk_callback(struct urb *urb)
 396 {
 397         struct acm_rb *rb = urb->context;
 398         struct acm *acm = rb->instance;
 399         unsigned long flags;
 400
 401         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
 402                                         rb->index, urb->actual_length);
 403         set_bit(rb->index, &acm->read_urbs_free);
 404
 405         if (!acm->dev) {
 406                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 407                 return;
 408         }
 409         usb_mark_last_busy(acm->dev);
 410
 411         if (urb->status) {
 412                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
 413                                                         __func__, urb->status);
 414                 return;
 415         }
 416         acm_process_read_urb(acm, urb);
 417
 418         /* throttle device if requested by tty */
 419         spin_lock_irqsave(&acm->read_lock, flags);
 420         acm->throttled = acm->throttle_req;
 421         if (!acm->throttled && !acm->susp_count) {
 422                 spin_unlock_irqrestore(&acm->read_lock, flags);
 423                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 424         } else {
 425                 spin_unlock_irqrestore(&acm->read_lock, flags);
 426         }
 427 }
 428
 429 /* data interface wrote those outgoing bytes */
 430 static void acm_write_bulk(struct urb *urb)
 431 {
 432         struct acm_wb *wb = urb->context;
 433         struct acm *acm = wb->instance;
 434         unsigned long flags;
 435
 436         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
 437                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
 438                         __func__,
 439                         urb->actual_length,
 440                         urb->transfer_buffer_length,
 441                         urb->status);
 442
 443         spin_lock_irqsave(&acm->write_lock, flags);
 444         acm_write_done(acm, wb);
 445         spin_unlock_irqrestore(&acm->write_lock, flags);
 446         schedule_work(&acm->work);
 447 }
 448
 449 static void acm_softint(struct work_struct *work)
 450 {
 451         struct acm *acm = container_of(work, struct acm, work);
 452
 453         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 454
 455         tty_port_tty_wakeup(&acm->port);
 456 }
 457
 458 /*
 459  * TTY handlers
 460  */
 461
 462 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 463 {
 464         struct acm *acm;
 465         int retval;
 466
 467         dev_dbg(tty->dev, "%s\n", __func__);
 468
 469         acm = acm_get_by_index(tty->index);
 470         if (!acm)
 471                 return -ENODEV;
 472
 473         retval = tty_standard_install(driver, tty);
 474         if (retval)
 475                 goto error_init_termios;
 476
 477         tty->driver_data = acm;
 478
 479         return 0;
 480
 481 error_init_termios:
 482         tty_port_put(&acm->port);
 483         return retval;
 484 }
 485
 486 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 487 {
 488         struct acm *acm = tty->driver_data;
 489
 490         dev_dbg(tty->dev, "%s\n", __func__);
 491
 492         return tty_port_open(&acm->port, tty, filp);
 493 }
 494
 495 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 496 {
 497         struct acm *acm = container_of(port, struct acm, port);
 498         int retval = -ENODEV;
 499
 500         dev_dbg(&acm->control->dev, "%s\n", __func__);
 501
 502         mutex_lock(&acm->mutex);
 503         if (acm->disconnected)
 504                 goto disconnected;
 505
 506         retval = usb_autopm_get_interface(acm->control);
 507         if (retval)
 508                 goto error_get_interface;
 509
 510         /*
 511          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 512          * memory is really nasty...
 513          */
 514         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 515         acm->control->needs_remote_wakeup = 1;
 516
 517         acm->ctrlurb->dev = acm->dev;
 518         if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
 519                 dev_err(&acm->control->dev,
 520                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 521                 goto error_submit_urb;
 522         }
 523
 524         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
 525         if (acm_set_control(acm, acm->ctrlout) < 0 &&
 526             (acm->ctrl_caps & USB_CDC_CAP_LINE))
 527                 goto error_set_control;
 528
 529         usb_autopm_put_interface(acm->control);
 530
 531         /*
 532          * Unthrottle device in case the TTY was closed while throttled.
 533          */
 534         spin_lock_irq(&acm->read_lock);
 535         acm->throttled = 0;
 536         acm->throttle_req = 0;
 537         spin_unlock_irq(&acm->read_lock);
 538
 539         if (acm_submit_read_urbs(acm, GFP_KERNEL))
 540                 goto error_submit_read_urbs;
 541
 542         mutex_unlock(&acm->mutex);
 543
 544         return 0;
 545
 546 error_submit_read_urbs:
 547         acm->ctrlout = 0;
 548         acm_set_control(acm, acm->ctrlout);
 549 error_set_control:
 550         usb_kill_urb(acm->ctrlurb);
 551 error_submit_urb:
 552         usb_autopm_put_interface(acm->control);
 553 error_get_interface:
 554 disconnected:
 555         mutex_unlock(&acm->mutex);
 556         return retval;
 557 }
 558
 559 static void acm_port_destruct(struct tty_port *port)
 560 {
 561         struct acm *acm = container_of(port, struct acm, port);
 562
 563         dev_dbg(&acm->control->dev, "%s\n", __func__);
 564
 565         acm_release_minor(acm);
 566         usb_put_intf(acm->control);
 567         kfree(acm->country_codes);
 568         kfree(acm);
 569 }
 570
 571 static void acm_port_shutdown(struct tty_port *port)
 572 {
 573         struct acm *acm = container_of(port, struct acm, port);
 574         int i;
 575
 576         dev_dbg(&acm->control->dev, "%s\n", __func__);
 577
 578         mutex_lock(&acm->mutex);
 579         if (!acm->disconnected) {
 580                 usb_autopm_get_interface(acm->control);
 581                 acm_set_control(acm, acm->ctrlout = 0);
 582                 usb_kill_urb(acm->ctrlurb);
 583                 for (i = 0; i < ACM_NW; i++)
 584                         usb_kill_urb(acm->wb[i].urb);
 585                 for (i = 0; i < acm->rx_buflimit; i++)
 586                         usb_kill_urb(acm->read_urbs[i]);
 587                 acm->control->needs_remote_wakeup = 0;
 588                 usb_autopm_put_interface(acm->control);
 589         }
 590         mutex_unlock(&acm->mutex);
 591 }
 592
 593 static void acm_tty_cleanup(struct tty_struct *tty)
 594 {
 595         struct acm *acm = tty->driver_data;
 596         dev_dbg(&acm->control->dev, "%s\n", __func__);
 597         tty_port_put(&acm->port);
 598 }
 599
 600 static void acm_tty_hangup(struct tty_struct *tty)
 601 {
 602         struct acm *acm = tty->driver_data;
 603         dev_dbg(&acm->control->dev, "%s\n", __func__);
 604         tty_port_hangup(&acm->port);
 605 }
 606
 607 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 608 {
 609         struct acm *acm = tty->driver_data;
 610         dev_dbg(&acm->control->dev, "%s\n", __func__);
 611         tty_port_close(&acm->port, tty, filp);
 612 }
 613
 614 static int acm_tty_write(struct tty_struct *tty,
 615                                         const unsigned char *buf, int count)
 616 {
 617         struct acm *acm = tty->driver_data;
 618         int stat;
 619         unsigned long flags;
 620         int wbn;
 621         struct acm_wb *wb;
 622
 623         if (!count)
 624                 return 0;
 625
 626         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 627
 628         spin_lock_irqsave(&acm->write_lock, flags);
 629         wbn = acm_wb_alloc(acm);
 630         if (wbn < 0) {
 631                 spin_unlock_irqrestore(&acm->write_lock, flags);
 632                 return 0;
 633         }
 634         wb = &acm->wb[wbn];
 635
 636         if (!acm->dev) {
 637                 wb->use = 0;
 638                 spin_unlock_irqrestore(&acm->write_lock, flags);
 639                 return -ENODEV;
 640         }
 641
 642         count = (count > acm->writesize) ? acm->writesize : count;
 643         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 644         memcpy(wb->buf, buf, count);
 645         wb->len = count;
 646
 647         usb_autopm_get_interface_async(acm->control);
 648         if (acm->susp_count) {
 649                 if (!acm->delayed_wb)
 650                         acm->delayed_wb = wb;
 651                 else
 652                         usb_autopm_put_interface_async(acm->control);
 653                 spin_unlock_irqrestore(&acm->write_lock, flags);
 654                 return count;   /* A white lie */
 655         }
 656         usb_mark_last_busy(acm->dev);
 657
 658         stat = acm_start_wb(acm, wb);
 659         spin_unlock_irqrestore(&acm->write_lock, flags);
 660
 661         if (stat < 0)
 662                 return stat;
 663         return count;
 664 }
 665
 666 static int acm_tty_write_room(struct tty_struct *tty)
 667 {
 668         struct acm *acm = tty->driver_data;
 669         /*
 670          * Do not let the line discipline to know that we have a reserve,
 671          * or it might get too enthusiastic.
 672          */
 673         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 674 }
 675
 676 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 677 {
 678         struct acm *acm = tty->driver_data;
 679         /*
 680          * if the device was unplugged then any remaining characters fell out
 681          * of the connector ;)
 682          */
 683         if (acm->disconnected)
 684                 return 0;
 685         /*
 686          * This is inaccurate (overcounts), but it works.
 687          */
 688         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 689 }
 690
 691 static void acm_tty_throttle(struct tty_struct *tty)
 692 {
 693         struct acm *acm = tty->driver_data;
 694
 695         spin_lock_irq(&acm->read_lock);
 696         acm->throttle_req = 1;
 697         spin_unlock_irq(&acm->read_lock);
 698 }
 699
 700 static void acm_tty_unthrottle(struct tty_struct *tty)
 701 {
 702         struct acm *acm = tty->driver_data;
 703         unsigned int was_throttled;
 704
 705         spin_lock_irq(&acm->read_lock);
 706         was_throttled = acm->throttled;
 707         acm->throttled = 0;
 708         acm->throttle_req = 0;
 709         spin_unlock_irq(&acm->read_lock);
 710
 711         if (was_throttled)
 712                 acm_submit_read_urbs(acm, GFP_KERNEL);
 713 }
 714
 715 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 716 {
 717         struct acm *acm = tty->driver_data;
 718         int retval;
 719
 720         retval = acm_send_break(acm, state ? 0xffff : 0);
 721         if (retval < 0)
 722                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 723                                                                 __func__);
 724         return retval;
 725 }
 726
 727 static int acm_tty_tiocmget(struct tty_struct *tty)
 728 {
 729         struct acm *acm = tty->driver_data;
 730
 731         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 732                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 733                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 734                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 735                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 736                TIOCM_CTS;
 737 }
 738
 739 static int acm_tty_tiocmset(struct tty_struct *tty,
 740                             unsigned int set, unsigned int clear)
 741 {
 742         struct acm *acm = tty->driver_data;
 743         unsigned int newctrl;
 744
 745         newctrl = acm->ctrlout;
 746         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 747                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 748         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 749                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 750
 751         newctrl = (newctrl & ~clear) | set;
 752
 753         if (acm->ctrlout == newctrl)
 754                 return 0;
 755         return acm_set_control(acm, acm->ctrlout = newctrl);
 756 }
 757
 758 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 759 {
 760         struct serial_struct tmp;
 761
 762         if (!info)
 763                 return -EINVAL;
 764
 765         memset(&tmp, 0, sizeof(tmp));
 766         tmp.flags = ASYNC_LOW_LATENCY;
 767         tmp.xmit_fifo_size = acm->writesize;
 768         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 769         tmp.close_delay = acm->port.close_delay / 10;
 770         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 771                                 ASYNC_CLOSING_WAIT_NONE :
 772                                 acm->port.closing_wait / 10;
 773
 774         if (copy_to_user(info, &tmp, sizeof(tmp)))
 775                 return -EFAULT;
 776         else
 777                 return 0;
 778 }
 779
 780 static int set_serial_info(struct acm *acm,
 781                                 struct serial_struct __user *newinfo)
 782 {
 783         struct serial_struct new_serial;
 784         unsigned int closing_wait, close_delay;
 785         int retval = 0;
 786
 787         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 788                 return -EFAULT;
 789
 790         close_delay = new_serial.close_delay * 10;
 791         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 792                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 793
 794         mutex_lock(&acm->port.mutex);
 795
 796         if (!capable(CAP_SYS_ADMIN)) {
 797                 if ((close_delay != acm->port.close_delay) ||
 798                     (closing_wait != acm->port.closing_wait))
 799                         retval = -EPERM;
 800                 else
 801                         retval = -EOPNOTSUPP;
 802         } else {
 803                 acm->port.close_delay  = close_delay;
 804                 acm->port.closing_wait = closing_wait;
 805         }
 806
 807         mutex_unlock(&acm->port.mutex);
 808         return retval;
 809 }
 810
 811 static int wait_serial_change(struct acm *acm, unsigned long arg)
 812 {
 813         int rv = 0;
 814         DECLARE_WAITQUEUE(wait, current);
 815         struct async_icount old, new;
 816
 817         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
 818                 return -EINVAL;
 819         do {
 820                 spin_lock_irq(&acm->read_lock);
 821                 old = acm->oldcount;
 822                 new = acm->iocount;
 823                 acm->oldcount = new;
 824                 spin_unlock_irq(&acm->read_lock);
 825
 826                 if ((arg & TIOCM_DSR) &&
 827                         old.dsr != new.dsr)
 828                         break;
 829                 if ((arg & TIOCM_CD)  &&
 830                         old.dcd != new.dcd)
 831                         break;
 832                 if ((arg & TIOCM_RI) &&
 833                         old.rng != new.rng)
 834                         break;
 835
 836                 add_wait_queue(&acm->wioctl, &wait);
 837                 set_current_state(TASK_INTERRUPTIBLE);
 838                 schedule();
 839                 remove_wait_queue(&acm->wioctl, &wait);
 840                 if (acm->disconnected) {
 841                         if (arg & TIOCM_CD)
 842                                 break;
 843                         else
 844                                 rv = -ENODEV;
 845                 } else {
 846                         if (signal_pending(current))
 847                                 rv = -ERESTARTSYS;
 848                 }
 849         } while (!rv);
 850
 851
 852
 853         return rv;
 854 }
 855
 856 static int get_serial_usage(struct acm *acm,
 857                             struct serial_icounter_struct __user *count)
 858 {
 859         struct serial_icounter_struct icount;
 860         int rv = 0;
 861
 862         memset(&icount, 0, sizeof(icount));
 863         icount.dsr = acm->iocount.dsr;
 864         icount.rng = acm->iocount.rng;
 865         icount.dcd = acm->iocount.dcd;
 866         icount.frame = acm->iocount.frame;
 867         icount.overrun = acm->iocount.overrun;
 868         icount.parity = acm->iocount.parity;
 869         icount.brk = acm->iocount.brk;
 870
 871         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 872                 rv = -EFAULT;
 873
 874         return rv;
 875 }
 876
 877 static int acm_tty_ioctl(struct tty_struct *tty,
 878                                         unsigned int cmd, unsigned long arg)
 879 {
 880         struct acm *acm = tty->driver_data;
 881         int rv = -ENOIOCTLCMD;
 882
 883         switch (cmd) {
 884         case TIOCGSERIAL: /* gets serial port data */
 885                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 886                 break;
 887         case TIOCSSERIAL:
 888                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 889                 break;
 890         case TIOCMIWAIT:
 891                 rv = usb_autopm_get_interface(acm->control);
 892                 if (rv < 0) {
 893                         rv = -EIO;
 894                         break;
 895                 }
 896                 rv = wait_serial_change(acm, arg);
 897                 usb_autopm_put_interface(acm->control);
 898                 break;
 899         case TIOCGICOUNT:
 900                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
 901                 break;
 902         }
 903
 904         return rv;
 905 }
 906
 907 static void acm_tty_set_termios(struct tty_struct *tty,
 908                                                 struct ktermios *termios_old)
 909 {
 910         struct acm *acm = tty->driver_data;
 911         struct ktermios *termios = &tty->termios;
 912         struct usb_cdc_line_coding newline;
 913         int newctrl = acm->ctrlout;
 914
 915         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 916         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 917         newline.bParityType = termios->c_cflag & PARENB ?
 918                                 (termios->c_cflag & PARODD ? 1 : 2) +
 919                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 920         switch (termios->c_cflag & CSIZE) {
 921         case CS5:
 922                 newline.bDataBits = 5;
 923                 break;
 924         case CS6:
 925                 newline.bDataBits = 6;
 926                 break;
 927         case CS7:
 928                 newline.bDataBits = 7;
 929                 break;
 930         case CS8:
 931         default:
 932                 newline.bDataBits = 8;
 933                 break;
 934         }
 935         /* FIXME: Needs to clear unsupported bits in the termios */
 936         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 937
 938         if (!newline.dwDTERate) {
 939                 newline.dwDTERate = acm->line.dwDTERate;
 940                 newctrl &= ~ACM_CTRL_DTR;
 941         } else
 942                 newctrl |=  ACM_CTRL_DTR;
 943
 944         if (newctrl != acm->ctrlout)
 945                 acm_set_control(acm, acm->ctrlout = newctrl);
 946
 947         if (memcmp(&acm->line, &newline, sizeof newline)) {
 948                 memcpy(&acm->line, &newline, sizeof newline);
 949                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 950                         __func__,
 951                         le32_to_cpu(newline.dwDTERate),
 952                         newline.bCharFormat, newline.bParityType,
 953                         newline.bDataBits);
 954                 acm_set_line(acm, &acm->line);
 955         }
 956 }
 957
 958 static const struct tty_port_operations acm_port_ops = {
 959         .shutdown = acm_port_shutdown,
 960         .activate = acm_port_activate,
 961         .destruct = acm_port_destruct,
 962 };
 963
 964 /*
 965  * USB probe and disconnect routines.
 966  */
 967
 968 /* Little helpers: write/read buffers free */
 969 static void acm_write_buffers_free(struct acm *acm)
 970 {
 971         int i;
 972         struct acm_wb *wb;
 973         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 974
 975         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
 976                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
 977 }
 978
 979 static void acm_read_buffers_free(struct acm *acm)
 980 {
 981         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 982         int i;
 983
 984         for (i = 0; i < acm->rx_buflimit; i++)
 985                 usb_free_coherent(usb_dev, acm->readsize,
 986                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
 987 }
 988
 989 /* Little helper: write buffers allocate */
 990 static int acm_write_buffers_alloc(struct acm *acm)
 991 {
 992         int i;
 993         struct acm_wb *wb;
 994
 995         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
 996                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
 997                     &wb->dmah);
 998                 if (!wb->buf) {
 999                         while (i != 0) {
1000                                 --i;
1001                                 --wb;
1002                                 usb_free_coherent(acm->dev, acm->writesize,
1003                                     wb->buf, wb->dmah);
1004                         }
1005                         return -ENOMEM;
1006                 }
1007         }
1008         return 0;
1009 }
1010
1011 static int acm_probe(struct usb_interface *intf,
1012                      const struct usb_device_id *id)
1013 {
1014         struct usb_cdc_union_desc *union_header = NULL;
1015         struct usb_cdc_country_functional_desc *cfd = NULL;
1016         unsigned char *buffer = intf->altsetting->extra;
1017         int buflen = intf->altsetting->extralen;
1018         struct usb_interface *control_interface;
1019         struct usb_interface *data_interface;
1020         struct usb_endpoint_descriptor *epctrl = NULL;
1021         struct usb_endpoint_descriptor *epread = NULL;
1022         struct usb_endpoint_descriptor *epwrite = NULL;
1023         struct usb_device *usb_dev = interface_to_usbdev(intf);
1024         struct acm *acm;
1025         int minor;
1026         int ctrlsize, readsize;
1027         u8 *buf;
1028         u8 ac_management_function = 0;
1029         u8 call_management_function = 0;
1030         int call_interface_num = -1;
1031         int data_interface_num = -1;
1032         unsigned long quirks;
1033         int num_rx_buf;
1034         int i;
1035         int combined_interfaces = 0;
1036         struct device *tty_dev;
1037         int rv = -ENOMEM;
1038
1039         /* normal quirks */
1040         quirks = (unsigned long)id->driver_info;
1041
1042         if (quirks == IGNORE_DEVICE)
1043                 return -ENODEV;
1044
1045         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1046
1047         /* handle quirks deadly to normal probing*/
1048         if (quirks == NO_UNION_NORMAL) {
1049                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1050                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1051                 goto skip_normal_probe;
1052         }
1053
1054         /* normal probing*/
1055         if (!buffer) {
1056                 dev_err(&intf->dev, "Weird descriptor references\n");
1057                 return -EINVAL;
1058         }
1059
1060         if (!buflen) {
1061                 if (intf->cur_altsetting->endpoint &&
1062                                 intf->cur_altsetting->endpoint->extralen &&
1063                                 intf->cur_altsetting->endpoint->extra) {
1064                         dev_dbg(&intf->dev,
1065                                 "Seeking extra descriptors on endpoint\n");
1066                         buflen = intf->cur_altsetting->endpoint->extralen;
1067                         buffer = intf->cur_altsetting->endpoint->extra;
1068                 } else {
1069                         dev_err(&intf->dev,
1070                                 "Zero length descriptor references\n");
1071                         return -EINVAL;
1072                 }
1073         }
1074
1075         while (buflen > 0) {
1076                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1077                         dev_err(&intf->dev, "skipping garbage\n");
1078                         goto next_desc;
1079                 }
1080
1081                 switch (buffer[2]) {
1082                 case USB_CDC_UNION_TYPE: /* we've found it */
1083                         if (union_header) {
1084                                 dev_err(&intf->dev, "More than one "
1085                                         "union descriptor, skipping ...\n");
1086                                 goto next_desc;
1087                         }
1088                         union_header = (struct usb_cdc_union_desc *)buffer;
1089                         break;
1090                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1091                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1092                         break;
1093                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1094                         break; /* for now we ignore it */
1095                 case USB_CDC_ACM_TYPE:
1096                         ac_management_function = buffer[3];
1097                         break;
1098                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1099                         call_management_function = buffer[3];
1100                         call_interface_num = buffer[4];
1101                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1102                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1103                         break;
1104                 default:
1105                         /* there are LOTS more CDC descriptors that
1106                          * could legitimately be found here.
1107                          */
1108                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1109                                         "type %02x, length %d\n",
1110                                         buffer[2], buffer[0]);
1111                         break;
1112                 }
1113 next_desc:
1114                 buflen -= buffer[0];
1115                 buffer += buffer[0];
1116         }
1117
1118         if (!union_header) {
1119                 if (call_interface_num > 0) {
1120                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1121                         /* quirks for Droids MuIn LCD */
1122                         if (quirks & NO_DATA_INTERFACE)
1123                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1124                         else
1125                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1126                         control_interface = intf;
1127                 } else {
1128                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1129                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1130                                 return -ENODEV;
1131                         } else {
1132                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1133                                 combined_interfaces = 1;
1134                                 control_interface = data_interface = intf;
1135                                 goto look_for_collapsed_interface;
1136                         }
1137                 }
1138         } else {
1139                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1140                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1141                 if (!control_interface || !data_interface) {
1142                         dev_dbg(&intf->dev, "no interfaces\n");
1143                         return -ENODEV;
1144                 }
1145         }
1146
1147         if (data_interface_num != call_interface_num)
1148                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1149
1150         if (control_interface == data_interface) {
1151                 /* some broken devices designed for windows work this way */
1152                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1153                 combined_interfaces = 1;
1154                 /* a popular other OS doesn't use it */
1155                 quirks |= NO_CAP_LINE;
1156                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1157                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1158                         return -EINVAL;
1159                 }
1160 look_for_collapsed_interface:
1161                 for (i = 0; i < 3; i++) {
1162                         struct usb_endpoint_descriptor *ep;
1163                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1164
1165                         if (usb_endpoint_is_int_in(ep))
1166                                 epctrl = ep;
1167                         else if (usb_endpoint_is_bulk_out(ep))
1168                                 epwrite = ep;
1169                         else if (usb_endpoint_is_bulk_in(ep))
1170                                 epread = ep;
1171                         else
1172                                 return -EINVAL;
1173                 }
1174                 if (!epctrl || !epread || !epwrite)
1175                         return -ENODEV;
1176                 else
1177                         goto made_compressed_probe;
1178         }
1179
1180 skip_normal_probe:
1181
1182         /*workaround for switched interfaces */
1183         if (data_interface->cur_altsetting->desc.bInterfaceClass
1184                                                 != CDC_DATA_INTERFACE_TYPE) {
1185                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1186                                                 == CDC_DATA_INTERFACE_TYPE) {
1187                         struct usb_interface *t;
1188                         dev_dbg(&intf->dev,
1189                                 "Your device has switched interfaces.\n");
1190                         t = control_interface;
1191                         control_interface = data_interface;
1192                         data_interface = t;
1193                 } else {
1194                         return -EINVAL;
1195                 }
1196         }
1197
1198         /* Accept probe requests only for the control interface */
1199         if (!combined_interfaces && intf != control_interface)
1200                 return -ENODEV;
1201
1202         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1203                 /* valid in this context */
1204                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1205                 return -EBUSY;
1206         }
1207
1208
1209         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1210             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1211                 return -EINVAL;
1212
1213         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1214         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1215         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1216
1217
1218         /* workaround for switched endpoints */
1219         if (!usb_endpoint_dir_in(epread)) {
1220                 /* descriptors are swapped */
1221                 struct usb_endpoint_descriptor *t;
1222                 dev_dbg(&intf->dev,
1223                         "The data interface has switched endpoints\n");
1224                 t = epread;
1225                 epread = epwrite;
1226                 epwrite = t;
1227         }
1228 made_compressed_probe:
1229         dev_dbg(&intf->dev, "interfaces are valid\n");
1230
1231         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1232         if (acm == NULL) {
1233                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1234                 goto alloc_fail;
1235         }
1236
1237         minor = acm_alloc_minor(acm);
1238         if (minor == ACM_TTY_MINORS) {
1239                 dev_err(&intf->dev, "no more free acm devices\n");
1240                 kfree(acm);
1241                 return -ENODEV;
1242         }
1243
1244         ctrlsize = usb_endpoint_maxp(epctrl);
1245         readsize = usb_endpoint_maxp(epread) *
1246                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1247         acm->combined_interfaces = combined_interfaces;
1248         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1249         acm->control = control_interface;
1250         acm->data = data_interface;
1251         acm->minor = minor;
1252         acm->dev = usb_dev;
1253         acm->ctrl_caps = ac_management_function;
1254         if (quirks & NO_CAP_LINE)
1255                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1256         acm->ctrlsize = ctrlsize;
1257         acm->readsize = readsize;
1258         acm->rx_buflimit = num_rx_buf;
1259         INIT_WORK(&acm->work, acm_softint);
1260         init_waitqueue_head(&acm->wioctl);
1261         spin_lock_init(&acm->write_lock);
1262         spin_lock_init(&acm->read_lock);
1263         mutex_init(&acm->mutex);
1264         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1265         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1266         if (acm->is_int_ep)
1267                 acm->bInterval = epread->bInterval;
1268         tty_port_init(&acm->port);
1269         acm->port.ops = &acm_port_ops;
1270
1271         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1272         if (!buf) {
1273                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1274                 goto alloc_fail2;
1275         }
1276         acm->ctrl_buffer = buf;
1277
1278         if (acm_write_buffers_alloc(acm) < 0) {
1279                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1280                 goto alloc_fail4;
1281         }
1282
1283         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1284         if (!acm->ctrlurb) {
1285                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1286                 goto alloc_fail5;
1287         }
1288         for (i = 0; i < num_rx_buf; i++) {
1289                 struct acm_rb *rb = &(acm->read_buffers[i]);
1290                 struct urb *urb;
1291
1292                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1293                                                                 &rb->dma);
1294                 if (!rb->base) {
1295                         dev_err(&intf->dev, "out of memory "
1296                                         "(read bufs usb_alloc_coherent)\n");
1297                         goto alloc_fail6;
1298                 }
1299                 rb->index = i;
1300                 rb->instance = acm;
1301
1302                 urb = usb_alloc_urb(0, GFP_KERNEL);
1303                 if (!urb) {
1304                         dev_err(&intf->dev,
1305                                 "out of memory (read urbs usb_alloc_urb)\n");
1306                         goto alloc_fail6;
1307                 }
1308                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1309                 urb->transfer_dma = rb->dma;
1310                 if (acm->is_int_ep) {
1311                         usb_fill_int_urb(urb, acm->dev,
1312                                          acm->rx_endpoint,
1313                                          rb->base,
1314                                          acm->readsize,
1315                                          acm_read_bulk_callback, rb,
1316                                          acm->bInterval);
1317                 } else {
1318                         usb_fill_bulk_urb(urb, acm->dev,
1319                                           acm->rx_endpoint,
1320                                           rb->base,
1321                                           acm->readsize,
1322                                           acm_read_bulk_callback, rb);
1323                 }
1324
1325                 acm->read_urbs[i] = urb;
1326                 __set_bit(i, &acm->read_urbs_free);
1327         }
1328         for (i = 0; i < ACM_NW; i++) {
1329                 struct acm_wb *snd = &(acm->wb[i]);
1330
1331                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1332                 if (snd->urb == NULL) {
1333                         dev_err(&intf->dev,
1334                                 "out of memory (write urbs usb_alloc_urb)\n");
1335                         goto alloc_fail7;
1336                 }
1337
1338                 if (usb_endpoint_xfer_int(epwrite))
1339                         usb_fill_int_urb(snd->urb, usb_dev,
1340                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1341                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1342                 else
1343                         usb_fill_bulk_urb(snd->urb, usb_dev,
1344                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1345                                 NULL, acm->writesize, acm_write_bulk, snd);
1346                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1347                 snd->instance = acm;
1348         }
1349
1350         usb_set_intfdata(intf, acm);
1351
1352         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1353         if (i < 0)
1354                 goto alloc_fail7;
1355
1356         if (cfd) { /* export the country data */
1357                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1358                 if (!acm->country_codes)
1359                         goto skip_countries;
1360                 acm->country_code_size = cfd->bLength - 4;
1361                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1362                                                         cfd->bLength - 4);
1363                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1364
1365                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1366                 if (i < 0) {
1367                         kfree(acm->country_codes);
1368                         acm->country_codes = NULL;
1369                         acm->country_code_size = 0;
1370                         goto skip_countries;
1371                 }
1372
1373                 i = device_create_file(&intf->dev,
1374                                                 &dev_attr_iCountryCodeRelDate);
1375                 if (i < 0) {
1376                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1377                         kfree(acm->country_codes);
1378                         acm->country_codes = NULL;
1379                         acm->country_code_size = 0;
1380                         goto skip_countries;
1381                 }
1382         }
1383
1384 skip_countries:
1385         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1386                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1387                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1388                          /* works around buggy devices */
1389                          epctrl->bInterval ? epctrl->bInterval : 16);
1390         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1391         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1392
1393         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1394
1395         acm_set_control(acm, acm->ctrlout);
1396
1397         acm->line.dwDTERate = cpu_to_le32(9600);
1398         acm->line.bDataBits = 8;
1399         acm_set_line(acm, &acm->line);
1400
1401         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1402         usb_set_intfdata(data_interface, acm);
1403
1404         usb_get_intf(control_interface);
1405         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1406                         &control_interface->dev);
1407         if (IS_ERR(tty_dev)) {
1408                 rv = PTR_ERR(tty_dev);
1409                 goto alloc_fail8;
1410         }
1411
1412         return 0;
1413 alloc_fail8:
1414         if (acm->country_codes) {
1415                 device_remove_file(&acm->control->dev,
1416                                 &dev_attr_wCountryCodes);
1417                 device_remove_file(&acm->control->dev,
1418                                 &dev_attr_iCountryCodeRelDate);
1419         }
1420         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1421 alloc_fail7:
1422         usb_set_intfdata(intf, NULL);
1423         for (i = 0; i < ACM_NW; i++)
1424                 usb_free_urb(acm->wb[i].urb);
1425 alloc_fail6:
1426         for (i = 0; i < num_rx_buf; i++)
1427                 usb_free_urb(acm->read_urbs[i]);
1428         acm_read_buffers_free(acm);
1429         usb_free_urb(acm->ctrlurb);
1430 alloc_fail5:
1431         acm_write_buffers_free(acm);
1432 alloc_fail4:
1433         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1434 alloc_fail2:
1435         acm_release_minor(acm);
1436         kfree(acm);
1437 alloc_fail:
1438         return rv;
1439 }
1440
1441 static void stop_data_traffic(struct acm *acm)
1442 {
1443         int i;
1444
1445         dev_dbg(&acm->control->dev, "%s\n", __func__);
1446
1447         usb_kill_urb(acm->ctrlurb);
1448         for (i = 0; i < ACM_NW; i++)
1449                 usb_kill_urb(acm->wb[i].urb);
1450         for (i = 0; i < acm->rx_buflimit; i++)
1451                 usb_kill_urb(acm->read_urbs[i]);
1452
1453         cancel_work_sync(&acm->work);
1454 }
1455
1456 static void acm_disconnect(struct usb_interface *intf)
1457 {
1458         struct acm *acm = usb_get_intfdata(intf);
1459         struct usb_device *usb_dev = interface_to_usbdev(intf);
1460         struct tty_struct *tty;
1461         int i;
1462
1463         dev_dbg(&intf->dev, "%s\n", __func__);
1464
1465         /* sibling interface is already cleaning up */
1466         if (!acm)
1467                 return;
1468
1469         mutex_lock(&acm->mutex);
1470         acm->disconnected = true;
1471         if (acm->country_codes) {
1472                 device_remove_file(&acm->control->dev,
1473                                 &dev_attr_wCountryCodes);
1474                 device_remove_file(&acm->control->dev,
1475                                 &dev_attr_iCountryCodeRelDate);
1476         }
1477         wake_up_all(&acm->wioctl);
1478         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1479         usb_set_intfdata(acm->control, NULL);
1480         usb_set_intfdata(acm->data, NULL);
1481         mutex_unlock(&acm->mutex);
1482
1483         tty = tty_port_tty_get(&acm->port);
1484         if (tty) {
1485                 tty_vhangup(tty);
1486                 tty_kref_put(tty);
1487         }
1488
1489         stop_data_traffic(acm);
1490
1491         tty_unregister_device(acm_tty_driver, acm->minor);
1492
1493         usb_free_urb(acm->ctrlurb);
1494         for (i = 0; i < ACM_NW; i++)
1495                 usb_free_urb(acm->wb[i].urb);
1496         for (i = 0; i < acm->rx_buflimit; i++)
1497                 usb_free_urb(acm->read_urbs[i]);
1498         acm_write_buffers_free(acm);
1499         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1500         acm_read_buffers_free(acm);
1501
1502         if (!acm->combined_interfaces)
1503                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1504                                         acm->data : acm->control);
1505
1506         tty_port_put(&acm->port);
1507 }
1508
1509 #ifdef CONFIG_PM
1510 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1511 {
1512         struct acm *acm = usb_get_intfdata(intf);
1513         int cnt;
1514
1515         if (PMSG_IS_AUTO(message)) {
1516                 int b;
1517
1518                 spin_lock_irq(&acm->write_lock);
1519                 b = acm->transmitting;
1520                 spin_unlock_irq(&acm->write_lock);
1521                 if (b)
1522                         return -EBUSY;
1523         }
1524
1525         spin_lock_irq(&acm->read_lock);
1526         spin_lock(&acm->write_lock);
1527         cnt = acm->susp_count++;
1528         spin_unlock(&acm->write_lock);
1529         spin_unlock_irq(&acm->read_lock);
1530
1531         if (cnt)
1532                 return 0;
1533
1534         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1535                 stop_data_traffic(acm);
1536
1537         return 0;
1538 }
1539
1540 static int acm_resume(struct usb_interface *intf)
1541 {
1542         struct acm *acm = usb_get_intfdata(intf);
1543         struct acm_wb *wb;
1544         int rv = 0;
1545         int cnt;
1546
1547         spin_lock_irq(&acm->read_lock);
1548         acm->susp_count -= 1;
1549         cnt = acm->susp_count;
1550         spin_unlock_irq(&acm->read_lock);
1551
1552         if (cnt)
1553                 return 0;
1554
1555         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1556                 rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1557
1558                 spin_lock_irq(&acm->write_lock);
1559                 if (acm->delayed_wb) {
1560                         wb = acm->delayed_wb;
1561                         acm->delayed_wb = NULL;
1562                         spin_unlock_irq(&acm->write_lock);
1563                         acm_start_wb(acm, wb);
1564                 } else {
1565                         spin_unlock_irq(&acm->write_lock);
1566                 }
1567
1568                 /*
1569                  * delayed error checking because we must
1570                  * do the write path at all cost
1571                  */
1572                 if (rv < 0)
1573                         goto err_out;
1574
1575                 rv = acm_submit_read_urbs(acm, GFP_NOIO);
1576         }
1577
1578 err_out:
1579         return rv;
1580 }
1581
1582 static int acm_reset_resume(struct usb_interface *intf)
1583 {
1584         struct acm *acm = usb_get_intfdata(intf);
1585
1586         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1587                 tty_port_tty_hangup(&acm->port, false);
1588
1589         return acm_resume(intf);
1590 }
1591
1592 #endif /* CONFIG_PM */
1593
1594 #define NOKIA_PCSUITE_ACM_INFO(x) \
1595                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1596                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1597                 USB_CDC_ACM_PROTO_VENDOR)
1598
1599 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1600                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1601                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1602                 USB_CDC_ACM_PROTO_VENDOR)
1603
1604 /*
1605  * USB driver structure.
1606  */
1607
1608 static const struct usb_device_id acm_ids[] = {
1609         /* quirky and broken devices */
1610         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1611         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1612         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1613         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1614         },
1615         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1616         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1617         },
1618         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1619         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1620         },
1621         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1622         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1623         },
1624         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1625         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1626         },
1627         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1628         .driver_info = SINGLE_RX_URB,
1629         },
1630         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1631         .driver_info = SINGLE_RX_URB, /* firmware bug */
1632         },
1633         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1634         .driver_info = SINGLE_RX_URB, /* firmware bug */
1635         },
1636         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1637         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1638         },
1639         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1640         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1641         },
1642         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1643         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1644         },
1645         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1646         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1647         },
1648         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1649         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1650         },
1651         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1652         },
1653         /* Motorola H24 HSPA module: */
1654         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1655         { USB_DEVICE(0x22b8, 0x2d92) }, /* modem           + diagnostics        */
1656         { USB_DEVICE(0x22b8, 0x2d93) }, /* modem + AT port                      */
1657         { USB_DEVICE(0x22b8, 0x2d95) }, /* modem + AT port + diagnostics        */
1658         { USB_DEVICE(0x22b8, 0x2d96) }, /* modem                         + NMEA */
1659         { USB_DEVICE(0x22b8, 0x2d97) }, /* modem           + diagnostics + NMEA */
1660         { USB_DEVICE(0x22b8, 0x2d99) }, /* modem + AT port               + NMEA */
1661         { USB_DEVICE(0x22b8, 0x2d9a) }, /* modem + AT port + diagnostics + NMEA */
1662
1663         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1664         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1665                                            data interface instead of
1666                                            communications interface.
1667                                            Maybe we should define a new
1668                                            quirk for this. */
1669         },
1670         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1671         .driver_info = NO_UNION_NORMAL,
1672         },
1673         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1674         .driver_info = NO_UNION_NORMAL,
1675         },
1676         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1677         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1678         },
1679         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1680         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1681         },
1682
1683         /* Nokia S60 phones expose two ACM channels. The first is
1684          * a modem and is picked up by the standard AT-command
1685          * information below. The second is 'vendor-specific' but
1686          * is treated as a serial device at the S60 end, so we want
1687          * to expose it on Linux too. */
1688         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1689         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1690         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1691         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1692         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1693         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1694         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1695         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1696         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1697         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1698         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1699         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1700         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1701         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1702         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1703         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1704         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1705         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1706         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1707         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1708         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1709         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1710         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1711         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1712         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1713         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1714         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1715         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1716         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1717         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1718         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1719         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1720         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1721         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1722         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1723         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1724         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1725         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1726         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1727         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1728         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1729         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1730         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1731         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1732         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1733         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1734         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1735         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1736         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1737         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1738         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1739         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1740         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1741         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1742         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1743         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1744         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1745         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1746
1747         /* Support for Owen devices */
1748         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1749
1750         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1751
1752         /* Support Lego NXT using pbLua firmware */
1753         { USB_DEVICE(0x0694, 0xff00),
1754         .driver_info = NOT_A_MODEM,
1755         },
1756
1757         /* Support for Droids MuIn LCD */
1758         { USB_DEVICE(0x04d8, 0x000b),
1759         .driver_info = NO_DATA_INTERFACE,
1760         },
1761
1762 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1763         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1764         .driver_info = IGNORE_DEVICE,
1765         },
1766         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1767         .driver_info = IGNORE_DEVICE,
1768         },
1769 #endif
1770
1771         /* control interfaces without any protocol set */
1772         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1773                 USB_CDC_PROTO_NONE) },
1774
1775         /* control interfaces with various AT-command sets */
1776         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1777                 USB_CDC_ACM_PROTO_AT_V25TER) },
1778         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1779                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1780         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1781                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1782         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1783                 USB_CDC_ACM_PROTO_AT_GSM) },
1784         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1785                 USB_CDC_ACM_PROTO_AT_3G) },
1786         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1787                 USB_CDC_ACM_PROTO_AT_CDMA) },
1788
1789         { }
1790 };
1791
1792 MODULE_DEVICE_TABLE(usb, acm_ids);
1793
1794 static struct usb_driver acm_driver = {
1795         .name =         "cdc_acm",
1796         .probe =        acm_probe,
1797         .disconnect =   acm_disconnect,
1798 #ifdef CONFIG_PM
1799         .suspend =      acm_suspend,
1800         .resume =       acm_resume,
1801         .reset_resume = acm_reset_resume,
1802 #endif
1803         .id_table =     acm_ids,
1804 #ifdef CONFIG_PM
1805         .supports_autosuspend = 1,
1806 #endif
1807         .disable_hub_initiated_lpm = 1,
1808 };
1809
1810 /*
1811  * TTY driver structures.
1812  */
1813
1814 static const struct tty_operations acm_ops = {
1815         .install =              acm_tty_install,
1816         .open =                 acm_tty_open,
1817         .close =                acm_tty_close,
1818         .cleanup =              acm_tty_cleanup,
1819         .hangup =               acm_tty_hangup,
1820         .write =                acm_tty_write,
1821         .write_room =           acm_tty_write_room,
1822         .ioctl =                acm_tty_ioctl,
1823         .throttle =             acm_tty_throttle,
1824         .unthrottle =           acm_tty_unthrottle,
1825         .chars_in_buffer =      acm_tty_chars_in_buffer,
1826         .break_ctl =            acm_tty_break_ctl,
1827         .set_termios =          acm_tty_set_termios,
1828         .tiocmget =             acm_tty_tiocmget,
1829         .tiocmset =             acm_tty_tiocmset,
1830 };
1831
1832 /*
1833  * Init / exit.
1834  */
1835
1836 static int __init acm_init(void)
1837 {
1838         int retval;
1839         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1840         if (!acm_tty_driver)
1841                 return -ENOMEM;
1842         acm_tty_driver->driver_name = "acm",
1843         acm_tty_driver->name = "ttyACM",
1844         acm_tty_driver->major = ACM_TTY_MAJOR,
1845         acm_tty_driver->minor_start = 0,
1846         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1847         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1848         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1849         acm_tty_driver->init_termios = tty_std_termios;
1850         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1851                                                                 HUPCL | CLOCAL;
1852         tty_set_operations(acm_tty_driver, &acm_ops);
1853
1854         retval = tty_register_driver(acm_tty_driver);
1855         if (retval) {
1856                 put_tty_driver(acm_tty_driver);
1857                 return retval;
1858         }
1859
1860         retval = usb_register(&acm_driver);
1861         if (retval) {
1862                 tty_unregister_driver(acm_tty_driver);
1863                 put_tty_driver(acm_tty_driver);
1864                 return retval;
1865         }
1866
1867         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1868
1869         return 0;
1870 }
1871
1872 static void __exit acm_exit(void)
1873 {
1874         usb_deregister(&acm_driver);
1875         tty_unregister_driver(acm_tty_driver);
1876         put_tty_driver(acm_tty_driver);
1877 }
1878
1879 module_init(acm_init);
1880 module_exit(acm_exit);
1881
1882 MODULE_AUTHOR(DRIVER_AUTHOR);
1883 MODULE_DESCRIPTION(DRIVER_DESC);
1884 MODULE_LICENSE("GPL");
1885 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);