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                 usb_autopm_put_interface(acm->control);
 522                 goto error_submit_urb;
 523         }
 524
 525         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
 526         if (acm_set_control(acm, acm->ctrlout) < 0 &&
 527             (acm->ctrl_caps & USB_CDC_CAP_LINE)) {
 528                 usb_autopm_put_interface(acm->control);
 529                 goto error_set_control;
 530         }
 531
 532         usb_autopm_put_interface(acm->control);
 533
 534         /*
 535          * Unthrottle device in case the TTY was closed while throttled.
 536          */
 537         spin_lock_irq(&acm->read_lock);
 538         acm->throttled = 0;
 539         acm->throttle_req = 0;
 540         spin_unlock_irq(&acm->read_lock);
 541
 542         if (acm_submit_read_urbs(acm, GFP_KERNEL))
 543                 goto error_submit_read_urbs;
 544
 545         mutex_unlock(&acm->mutex);
 546
 547         return 0;
 548
 549 error_submit_read_urbs:
 550         acm->ctrlout = 0;
 551         acm_set_control(acm, acm->ctrlout);
 552 error_set_control:
 553         usb_kill_urb(acm->ctrlurb);
 554 error_submit_urb:
 555 error_get_interface:
 556 disconnected:
 557         mutex_unlock(&acm->mutex);
 558         return retval;
 559 }
 560
 561 static void acm_port_destruct(struct tty_port *port)
 562 {
 563         struct acm *acm = container_of(port, struct acm, port);
 564
 565         dev_dbg(&acm->control->dev, "%s\n", __func__);
 566
 567         acm_release_minor(acm);
 568         usb_put_intf(acm->control);
 569         kfree(acm->country_codes);
 570         kfree(acm);
 571 }
 572
 573 static void acm_port_shutdown(struct tty_port *port)
 574 {
 575         struct acm *acm = container_of(port, struct acm, port);
 576         int i;
 577
 578         dev_dbg(&acm->control->dev, "%s\n", __func__);
 579
 580         mutex_lock(&acm->mutex);
 581         if (!acm->disconnected) {
 582                 usb_autopm_get_interface(acm->control);
 583                 acm_set_control(acm, acm->ctrlout = 0);
 584                 usb_kill_urb(acm->ctrlurb);
 585                 for (i = 0; i < ACM_NW; i++)
 586                         usb_kill_urb(acm->wb[i].urb);
 587                 for (i = 0; i < acm->rx_buflimit; i++)
 588                         usb_kill_urb(acm->read_urbs[i]);
 589                 acm->control->needs_remote_wakeup = 0;
 590                 usb_autopm_put_interface(acm->control);
 591         }
 592         mutex_unlock(&acm->mutex);
 593 }
 594
 595 static void acm_tty_cleanup(struct tty_struct *tty)
 596 {
 597         struct acm *acm = tty->driver_data;
 598         dev_dbg(&acm->control->dev, "%s\n", __func__);
 599         tty_port_put(&acm->port);
 600 }
 601
 602 static void acm_tty_hangup(struct tty_struct *tty)
 603 {
 604         struct acm *acm = tty->driver_data;
 605         dev_dbg(&acm->control->dev, "%s\n", __func__);
 606         tty_port_hangup(&acm->port);
 607 }
 608
 609 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 610 {
 611         struct acm *acm = tty->driver_data;
 612         dev_dbg(&acm->control->dev, "%s\n", __func__);
 613         tty_port_close(&acm->port, tty, filp);
 614 }
 615
 616 static int acm_tty_write(struct tty_struct *tty,
 617                                         const unsigned char *buf, int count)
 618 {
 619         struct acm *acm = tty->driver_data;
 620         int stat;
 621         unsigned long flags;
 622         int wbn;
 623         struct acm_wb *wb;
 624
 625         if (!count)
 626                 return 0;
 627
 628         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 629
 630         spin_lock_irqsave(&acm->write_lock, flags);
 631         wbn = acm_wb_alloc(acm);
 632         if (wbn < 0) {
 633                 spin_unlock_irqrestore(&acm->write_lock, flags);
 634                 return 0;
 635         }
 636         wb = &acm->wb[wbn];
 637
 638         if (!acm->dev) {
 639                 wb->use = 0;
 640                 spin_unlock_irqrestore(&acm->write_lock, flags);
 641                 return -ENODEV;
 642         }
 643
 644         count = (count > acm->writesize) ? acm->writesize : count;
 645         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 646         memcpy(wb->buf, buf, count);
 647         wb->len = count;
 648
 649         usb_autopm_get_interface_async(acm->control);
 650         if (acm->susp_count) {
 651                 if (!acm->delayed_wb)
 652                         acm->delayed_wb = wb;
 653                 else
 654                         usb_autopm_put_interface_async(acm->control);
 655                 spin_unlock_irqrestore(&acm->write_lock, flags);
 656                 return count;   /* A white lie */
 657         }
 658         usb_mark_last_busy(acm->dev);
 659
 660         stat = acm_start_wb(acm, wb);
 661         spin_unlock_irqrestore(&acm->write_lock, flags);
 662
 663         if (stat < 0)
 664                 return stat;
 665         return count;
 666 }
 667
 668 static int acm_tty_write_room(struct tty_struct *tty)
 669 {
 670         struct acm *acm = tty->driver_data;
 671         /*
 672          * Do not let the line discipline to know that we have a reserve,
 673          * or it might get too enthusiastic.
 674          */
 675         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 676 }
 677
 678 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 679 {
 680         struct acm *acm = tty->driver_data;
 681         /*
 682          * if the device was unplugged then any remaining characters fell out
 683          * of the connector ;)
 684          */
 685         if (acm->disconnected)
 686                 return 0;
 687         /*
 688          * This is inaccurate (overcounts), but it works.
 689          */
 690         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 691 }
 692
 693 static void acm_tty_throttle(struct tty_struct *tty)
 694 {
 695         struct acm *acm = tty->driver_data;
 696
 697         spin_lock_irq(&acm->read_lock);
 698         acm->throttle_req = 1;
 699         spin_unlock_irq(&acm->read_lock);
 700 }
 701
 702 static void acm_tty_unthrottle(struct tty_struct *tty)
 703 {
 704         struct acm *acm = tty->driver_data;
 705         unsigned int was_throttled;
 706
 707         spin_lock_irq(&acm->read_lock);
 708         was_throttled = acm->throttled;
 709         acm->throttled = 0;
 710         acm->throttle_req = 0;
 711         spin_unlock_irq(&acm->read_lock);
 712
 713         if (was_throttled)
 714                 acm_submit_read_urbs(acm, GFP_KERNEL);
 715 }
 716
 717 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 718 {
 719         struct acm *acm = tty->driver_data;
 720         int retval;
 721
 722         retval = acm_send_break(acm, state ? 0xffff : 0);
 723         if (retval < 0)
 724                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 725                                                                 __func__);
 726         return retval;
 727 }
 728
 729 static int acm_tty_tiocmget(struct tty_struct *tty)
 730 {
 731         struct acm *acm = tty->driver_data;
 732
 733         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 734                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 735                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 736                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 737                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 738                TIOCM_CTS;
 739 }
 740
 741 static int acm_tty_tiocmset(struct tty_struct *tty,
 742                             unsigned int set, unsigned int clear)
 743 {
 744         struct acm *acm = tty->driver_data;
 745         unsigned int newctrl;
 746
 747         newctrl = acm->ctrlout;
 748         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 749                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 750         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 751                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 752
 753         newctrl = (newctrl & ~clear) | set;
 754
 755         if (acm->ctrlout == newctrl)
 756                 return 0;
 757         return acm_set_control(acm, acm->ctrlout = newctrl);
 758 }
 759
 760 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 761 {
 762         struct serial_struct tmp;
 763
 764         if (!info)
 765                 return -EINVAL;
 766
 767         memset(&tmp, 0, sizeof(tmp));
 768         tmp.flags = ASYNC_LOW_LATENCY;
 769         tmp.xmit_fifo_size = acm->writesize;
 770         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 771         tmp.close_delay = acm->port.close_delay / 10;
 772         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 773                                 ASYNC_CLOSING_WAIT_NONE :
 774                                 acm->port.closing_wait / 10;
 775
 776         if (copy_to_user(info, &tmp, sizeof(tmp)))
 777                 return -EFAULT;
 778         else
 779                 return 0;
 780 }
 781
 782 static int set_serial_info(struct acm *acm,
 783                                 struct serial_struct __user *newinfo)
 784 {
 785         struct serial_struct new_serial;
 786         unsigned int closing_wait, close_delay;
 787         int retval = 0;
 788
 789         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 790                 return -EFAULT;
 791
 792         close_delay = new_serial.close_delay * 10;
 793         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 794                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 795
 796         mutex_lock(&acm->port.mutex);
 797
 798         if (!capable(CAP_SYS_ADMIN)) {
 799                 if ((close_delay != acm->port.close_delay) ||
 800                     (closing_wait != acm->port.closing_wait))
 801                         retval = -EPERM;
 802                 else
 803                         retval = -EOPNOTSUPP;
 804         } else {
 805                 acm->port.close_delay  = close_delay;
 806                 acm->port.closing_wait = closing_wait;
 807         }
 808
 809         mutex_unlock(&acm->port.mutex);
 810         return retval;
 811 }
 812
 813 static int wait_serial_change(struct acm *acm, unsigned long arg)
 814 {
 815         int rv = 0;
 816         DECLARE_WAITQUEUE(wait, current);
 817         struct async_icount old, new;
 818
 819         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
 820                 return -EINVAL;
 821         do {
 822                 spin_lock_irq(&acm->read_lock);
 823                 old = acm->oldcount;
 824                 new = acm->iocount;
 825                 acm->oldcount = new;
 826                 spin_unlock_irq(&acm->read_lock);
 827
 828                 if ((arg & TIOCM_DSR) &&
 829                         old.dsr != new.dsr)
 830                         break;
 831                 if ((arg & TIOCM_CD)  &&
 832                         old.dcd != new.dcd)
 833                         break;
 834                 if ((arg & TIOCM_RI) &&
 835                         old.rng != new.rng)
 836                         break;
 837
 838                 add_wait_queue(&acm->wioctl, &wait);
 839                 set_current_state(TASK_INTERRUPTIBLE);
 840                 schedule();
 841                 remove_wait_queue(&acm->wioctl, &wait);
 842                 if (acm->disconnected) {
 843                         if (arg & TIOCM_CD)
 844                                 break;
 845                         else
 846                                 rv = -ENODEV;
 847                 } else {
 848                         if (signal_pending(current))
 849                                 rv = -ERESTARTSYS;
 850                 }
 851         } while (!rv);
 852
 853
 854
 855         return rv;
 856 }
 857
 858 static int get_serial_usage(struct acm *acm,
 859                             struct serial_icounter_struct __user *count)
 860 {
 861         struct serial_icounter_struct icount;
 862         int rv = 0;
 863
 864         memset(&icount, 0, sizeof(icount));
 865         icount.dsr = acm->iocount.dsr;
 866         icount.rng = acm->iocount.rng;
 867         icount.dcd = acm->iocount.dcd;
 868         icount.frame = acm->iocount.frame;
 869         icount.overrun = acm->iocount.overrun;
 870         icount.parity = acm->iocount.parity;
 871         icount.brk = acm->iocount.brk;
 872
 873         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 874                 rv = -EFAULT;
 875
 876         return rv;
 877 }
 878
 879 static int acm_tty_ioctl(struct tty_struct *tty,
 880                                         unsigned int cmd, unsigned long arg)
 881 {
 882         struct acm *acm = tty->driver_data;
 883         int rv = -ENOIOCTLCMD;
 884
 885         switch (cmd) {
 886         case TIOCGSERIAL: /* gets serial port data */
 887                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 888                 break;
 889         case TIOCSSERIAL:
 890                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 891                 break;
 892         case TIOCMIWAIT:
 893                 rv = usb_autopm_get_interface(acm->control);
 894                 if (rv < 0) {
 895                         rv = -EIO;
 896                         break;
 897                 }
 898                 rv = wait_serial_change(acm, arg);
 899                 usb_autopm_put_interface(acm->control);
 900                 break;
 901         case TIOCGICOUNT:
 902                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
 903                 break;
 904         }
 905
 906         return rv;
 907 }
 908
 909 static void acm_tty_set_termios(struct tty_struct *tty,
 910                                                 struct ktermios *termios_old)
 911 {
 912         struct acm *acm = tty->driver_data;
 913         struct ktermios *termios = &tty->termios;
 914         struct usb_cdc_line_coding newline;
 915         int newctrl = acm->ctrlout;
 916
 917         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 918         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 919         newline.bParityType = termios->c_cflag & PARENB ?
 920                                 (termios->c_cflag & PARODD ? 1 : 2) +
 921                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 922         switch (termios->c_cflag & CSIZE) {
 923         case CS5:
 924                 newline.bDataBits = 5;
 925                 break;
 926         case CS6:
 927                 newline.bDataBits = 6;
 928                 break;
 929         case CS7:
 930                 newline.bDataBits = 7;
 931                 break;
 932         case CS8:
 933         default:
 934                 newline.bDataBits = 8;
 935                 break;
 936         }
 937         /* FIXME: Needs to clear unsupported bits in the termios */
 938         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 939
 940         if (!newline.dwDTERate) {
 941                 newline.dwDTERate = acm->line.dwDTERate;
 942                 newctrl &= ~ACM_CTRL_DTR;
 943         } else
 944                 newctrl |=  ACM_CTRL_DTR;
 945
 946         if (newctrl != acm->ctrlout)
 947                 acm_set_control(acm, acm->ctrlout = newctrl);
 948
 949         if (memcmp(&acm->line, &newline, sizeof newline)) {
 950                 memcpy(&acm->line, &newline, sizeof newline);
 951                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 952                         __func__,
 953                         le32_to_cpu(newline.dwDTERate),
 954                         newline.bCharFormat, newline.bParityType,
 955                         newline.bDataBits);
 956                 acm_set_line(acm, &acm->line);
 957         }
 958 }
 959
 960 static const struct tty_port_operations acm_port_ops = {
 961         .shutdown = acm_port_shutdown,
 962         .activate = acm_port_activate,
 963         .destruct = acm_port_destruct,
 964 };
 965
 966 /*
 967  * USB probe and disconnect routines.
 968  */
 969
 970 /* Little helpers: write/read buffers free */
 971 static void acm_write_buffers_free(struct acm *acm)
 972 {
 973         int i;
 974         struct acm_wb *wb;
 975         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 976
 977         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
 978                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
 979 }
 980
 981 static void acm_read_buffers_free(struct acm *acm)
 982 {
 983         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 984         int i;
 985
 986         for (i = 0; i < acm->rx_buflimit; i++)
 987                 usb_free_coherent(usb_dev, acm->readsize,
 988                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
 989 }
 990
 991 /* Little helper: write buffers allocate */
 992 static int acm_write_buffers_alloc(struct acm *acm)
 993 {
 994         int i;
 995         struct acm_wb *wb;
 996
 997         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
 998                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
 999                     &wb->dmah);
1000                 if (!wb->buf) {
1001                         while (i != 0) {
1002                                 --i;
1003                                 --wb;
1004                                 usb_free_coherent(acm->dev, acm->writesize,
1005                                     wb->buf, wb->dmah);
1006                         }
1007                         return -ENOMEM;
1008                 }
1009         }
1010         return 0;
1011 }
1012
1013 static int acm_probe(struct usb_interface *intf,
1014                      const struct usb_device_id *id)
1015 {
1016         struct usb_cdc_union_desc *union_header = NULL;
1017         struct usb_cdc_country_functional_desc *cfd = NULL;
1018         unsigned char *buffer = intf->altsetting->extra;
1019         int buflen = intf->altsetting->extralen;
1020         struct usb_interface *control_interface;
1021         struct usb_interface *data_interface;
1022         struct usb_endpoint_descriptor *epctrl = NULL;
1023         struct usb_endpoint_descriptor *epread = NULL;
1024         struct usb_endpoint_descriptor *epwrite = NULL;
1025         struct usb_device *usb_dev = interface_to_usbdev(intf);
1026         struct acm *acm;
1027         int minor;
1028         int ctrlsize, readsize;
1029         u8 *buf;
1030         u8 ac_management_function = 0;
1031         u8 call_management_function = 0;
1032         int call_interface_num = -1;
1033         int data_interface_num = -1;
1034         unsigned long quirks;
1035         int num_rx_buf;
1036         int i;
1037         int combined_interfaces = 0;
1038         struct device *tty_dev;
1039         int rv = -ENOMEM;
1040
1041         /* normal quirks */
1042         quirks = (unsigned long)id->driver_info;
1043
1044         if (quirks == IGNORE_DEVICE)
1045                 return -ENODEV;
1046
1047         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1048
1049         /* handle quirks deadly to normal probing*/
1050         if (quirks == NO_UNION_NORMAL) {
1051                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1052                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1053                 goto skip_normal_probe;
1054         }
1055
1056         /* normal probing*/
1057         if (!buffer) {
1058                 dev_err(&intf->dev, "Weird descriptor references\n");
1059                 return -EINVAL;
1060         }
1061
1062         if (!buflen) {
1063                 if (intf->cur_altsetting->endpoint &&
1064                                 intf->cur_altsetting->endpoint->extralen &&
1065                                 intf->cur_altsetting->endpoint->extra) {
1066                         dev_dbg(&intf->dev,
1067                                 "Seeking extra descriptors on endpoint\n");
1068                         buflen = intf->cur_altsetting->endpoint->extralen;
1069                         buffer = intf->cur_altsetting->endpoint->extra;
1070                 } else {
1071                         dev_err(&intf->dev,
1072                                 "Zero length descriptor references\n");
1073                         return -EINVAL;
1074                 }
1075         }
1076
1077         while (buflen > 0) {
1078                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1079                         dev_err(&intf->dev, "skipping garbage\n");
1080                         goto next_desc;
1081                 }
1082
1083                 switch (buffer[2]) {
1084                 case USB_CDC_UNION_TYPE: /* we've found it */
1085                         if (union_header) {
1086                                 dev_err(&intf->dev, "More than one "
1087                                         "union descriptor, skipping ...\n");
1088                                 goto next_desc;
1089                         }
1090                         union_header = (struct usb_cdc_union_desc *)buffer;
1091                         break;
1092                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1093                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1094                         break;
1095                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1096                         break; /* for now we ignore it */
1097                 case USB_CDC_ACM_TYPE:
1098                         ac_management_function = buffer[3];
1099                         break;
1100                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1101                         call_management_function = buffer[3];
1102                         call_interface_num = buffer[4];
1103                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1104                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1105                         break;
1106                 default:
1107                         /* there are LOTS more CDC descriptors that
1108                          * could legitimately be found here.
1109                          */
1110                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1111                                         "type %02x, length %d\n",
1112                                         buffer[2], buffer[0]);
1113                         break;
1114                 }
1115 next_desc:
1116                 buflen -= buffer[0];
1117                 buffer += buffer[0];
1118         }
1119
1120         if (!union_header) {
1121                 if (call_interface_num > 0) {
1122                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1123                         /* quirks for Droids MuIn LCD */
1124                         if (quirks & NO_DATA_INTERFACE)
1125                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1126                         else
1127                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1128                         control_interface = intf;
1129                 } else {
1130                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1131                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1132                                 return -ENODEV;
1133                         } else {
1134                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1135                                 combined_interfaces = 1;
1136                                 control_interface = data_interface = intf;
1137                                 goto look_for_collapsed_interface;
1138                         }
1139                 }
1140         } else {
1141                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1142                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1143                 if (!control_interface || !data_interface) {
1144                         dev_dbg(&intf->dev, "no interfaces\n");
1145                         return -ENODEV;
1146                 }
1147         }
1148
1149         if (data_interface_num != call_interface_num)
1150                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1151
1152         if (control_interface == data_interface) {
1153                 /* some broken devices designed for windows work this way */
1154                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1155                 combined_interfaces = 1;
1156                 /* a popular other OS doesn't use it */
1157                 quirks |= NO_CAP_LINE;
1158                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1159                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1160                         return -EINVAL;
1161                 }
1162 look_for_collapsed_interface:
1163                 for (i = 0; i < 3; i++) {
1164                         struct usb_endpoint_descriptor *ep;
1165                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1166
1167                         if (usb_endpoint_is_int_in(ep))
1168                                 epctrl = ep;
1169                         else if (usb_endpoint_is_bulk_out(ep))
1170                                 epwrite = ep;
1171                         else if (usb_endpoint_is_bulk_in(ep))
1172                                 epread = ep;
1173                         else
1174                                 return -EINVAL;
1175                 }
1176                 if (!epctrl || !epread || !epwrite)
1177                         return -ENODEV;
1178                 else
1179                         goto made_compressed_probe;
1180         }
1181
1182 skip_normal_probe:
1183
1184         /*workaround for switched interfaces */
1185         if (data_interface->cur_altsetting->desc.bInterfaceClass
1186                                                 != CDC_DATA_INTERFACE_TYPE) {
1187                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1188                                                 == CDC_DATA_INTERFACE_TYPE) {
1189                         struct usb_interface *t;
1190                         dev_dbg(&intf->dev,
1191                                 "Your device has switched interfaces.\n");
1192                         t = control_interface;
1193                         control_interface = data_interface;
1194                         data_interface = t;
1195                 } else {
1196                         return -EINVAL;
1197                 }
1198         }
1199
1200         /* Accept probe requests only for the control interface */
1201         if (!combined_interfaces && intf != control_interface)
1202                 return -ENODEV;
1203
1204         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1205                 /* valid in this context */
1206                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1207                 return -EBUSY;
1208         }
1209
1210
1211         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1212             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1213                 return -EINVAL;
1214
1215         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1216         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1217         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1218
1219
1220         /* workaround for switched endpoints */
1221         if (!usb_endpoint_dir_in(epread)) {
1222                 /* descriptors are swapped */
1223                 struct usb_endpoint_descriptor *t;
1224                 dev_dbg(&intf->dev,
1225                         "The data interface has switched endpoints\n");
1226                 t = epread;
1227                 epread = epwrite;
1228                 epwrite = t;
1229         }
1230 made_compressed_probe:
1231         dev_dbg(&intf->dev, "interfaces are valid\n");
1232
1233         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1234         if (acm == NULL) {
1235                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1236                 goto alloc_fail;
1237         }
1238
1239         minor = acm_alloc_minor(acm);
1240         if (minor == ACM_TTY_MINORS) {
1241                 dev_err(&intf->dev, "no more free acm devices\n");
1242                 kfree(acm);
1243                 return -ENODEV;
1244         }
1245
1246         ctrlsize = usb_endpoint_maxp(epctrl);
1247         readsize = usb_endpoint_maxp(epread) *
1248                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1249         acm->combined_interfaces = combined_interfaces;
1250         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1251         acm->control = control_interface;
1252         acm->data = data_interface;
1253         acm->minor = minor;
1254         acm->dev = usb_dev;
1255         acm->ctrl_caps = ac_management_function;
1256         if (quirks & NO_CAP_LINE)
1257                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1258         acm->ctrlsize = ctrlsize;
1259         acm->readsize = readsize;
1260         acm->rx_buflimit = num_rx_buf;
1261         INIT_WORK(&acm->work, acm_softint);
1262         init_waitqueue_head(&acm->wioctl);
1263         spin_lock_init(&acm->write_lock);
1264         spin_lock_init(&acm->read_lock);
1265         mutex_init(&acm->mutex);
1266         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1267         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1268         if (acm->is_int_ep)
1269                 acm->bInterval = epread->bInterval;
1270         tty_port_init(&acm->port);
1271         acm->port.ops = &acm_port_ops;
1272
1273         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1274         if (!buf) {
1275                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1276                 goto alloc_fail2;
1277         }
1278         acm->ctrl_buffer = buf;
1279
1280         if (acm_write_buffers_alloc(acm) < 0) {
1281                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1282                 goto alloc_fail4;
1283         }
1284
1285         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1286         if (!acm->ctrlurb) {
1287                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1288                 goto alloc_fail5;
1289         }
1290         for (i = 0; i < num_rx_buf; i++) {
1291                 struct acm_rb *rb = &(acm->read_buffers[i]);
1292                 struct urb *urb;
1293
1294                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1295                                                                 &rb->dma);
1296                 if (!rb->base) {
1297                         dev_err(&intf->dev, "out of memory "
1298                                         "(read bufs usb_alloc_coherent)\n");
1299                         goto alloc_fail6;
1300                 }
1301                 rb->index = i;
1302                 rb->instance = acm;
1303
1304                 urb = usb_alloc_urb(0, GFP_KERNEL);
1305                 if (!urb) {
1306                         dev_err(&intf->dev,
1307                                 "out of memory (read urbs usb_alloc_urb)\n");
1308                         goto alloc_fail6;
1309                 }
1310                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1311                 urb->transfer_dma = rb->dma;
1312                 if (acm->is_int_ep) {
1313                         usb_fill_int_urb(urb, acm->dev,
1314                                          acm->rx_endpoint,
1315                                          rb->base,
1316                                          acm->readsize,
1317                                          acm_read_bulk_callback, rb,
1318                                          acm->bInterval);
1319                 } else {
1320                         usb_fill_bulk_urb(urb, acm->dev,
1321                                           acm->rx_endpoint,
1322                                           rb->base,
1323                                           acm->readsize,
1324                                           acm_read_bulk_callback, rb);
1325                 }
1326
1327                 acm->read_urbs[i] = urb;
1328                 __set_bit(i, &acm->read_urbs_free);
1329         }
1330         for (i = 0; i < ACM_NW; i++) {
1331                 struct acm_wb *snd = &(acm->wb[i]);
1332
1333                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1334                 if (snd->urb == NULL) {
1335                         dev_err(&intf->dev,
1336                                 "out of memory (write urbs usb_alloc_urb)\n");
1337                         goto alloc_fail7;
1338                 }
1339
1340                 if (usb_endpoint_xfer_int(epwrite))
1341                         usb_fill_int_urb(snd->urb, usb_dev,
1342                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1343                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1344                 else
1345                         usb_fill_bulk_urb(snd->urb, usb_dev,
1346                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1347                                 NULL, acm->writesize, acm_write_bulk, snd);
1348                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1349                 snd->instance = acm;
1350         }
1351
1352         usb_set_intfdata(intf, acm);
1353
1354         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1355         if (i < 0)
1356                 goto alloc_fail7;
1357
1358         if (cfd) { /* export the country data */
1359                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1360                 if (!acm->country_codes)
1361                         goto skip_countries;
1362                 acm->country_code_size = cfd->bLength - 4;
1363                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1364                                                         cfd->bLength - 4);
1365                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1366
1367                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1368                 if (i < 0) {
1369                         kfree(acm->country_codes);
1370                         acm->country_codes = NULL;
1371                         acm->country_code_size = 0;
1372                         goto skip_countries;
1373                 }
1374
1375                 i = device_create_file(&intf->dev,
1376                                                 &dev_attr_iCountryCodeRelDate);
1377                 if (i < 0) {
1378                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1379                         kfree(acm->country_codes);
1380                         acm->country_codes = NULL;
1381                         acm->country_code_size = 0;
1382                         goto skip_countries;
1383                 }
1384         }
1385
1386 skip_countries:
1387         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1388                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1389                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1390                          /* works around buggy devices */
1391                          epctrl->bInterval ? epctrl->bInterval : 16);
1392         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1393         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1394
1395         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1396
1397         acm_set_control(acm, acm->ctrlout);
1398
1399         acm->line.dwDTERate = cpu_to_le32(9600);
1400         acm->line.bDataBits = 8;
1401         acm_set_line(acm, &acm->line);
1402
1403         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1404         usb_set_intfdata(data_interface, acm);
1405
1406         usb_get_intf(control_interface);
1407         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1408                         &control_interface->dev);
1409         if (IS_ERR(tty_dev)) {
1410                 rv = PTR_ERR(tty_dev);
1411                 goto alloc_fail8;
1412         }
1413
1414         return 0;
1415 alloc_fail8:
1416         if (acm->country_codes) {
1417                 device_remove_file(&acm->control->dev,
1418                                 &dev_attr_wCountryCodes);
1419                 device_remove_file(&acm->control->dev,
1420                                 &dev_attr_iCountryCodeRelDate);
1421         }
1422         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1423 alloc_fail7:
1424         usb_set_intfdata(intf, NULL);
1425         for (i = 0; i < ACM_NW; i++)
1426                 usb_free_urb(acm->wb[i].urb);
1427 alloc_fail6:
1428         for (i = 0; i < num_rx_buf; i++)
1429                 usb_free_urb(acm->read_urbs[i]);
1430         acm_read_buffers_free(acm);
1431         usb_free_urb(acm->ctrlurb);
1432 alloc_fail5:
1433         acm_write_buffers_free(acm);
1434 alloc_fail4:
1435         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1436 alloc_fail2:
1437         acm_release_minor(acm);
1438         kfree(acm);
1439 alloc_fail:
1440         return rv;
1441 }
1442
1443 static void stop_data_traffic(struct acm *acm)
1444 {
1445         int i;
1446
1447         dev_dbg(&acm->control->dev, "%s\n", __func__);
1448
1449         usb_kill_urb(acm->ctrlurb);
1450         for (i = 0; i < ACM_NW; i++)
1451                 usb_kill_urb(acm->wb[i].urb);
1452         for (i = 0; i < acm->rx_buflimit; i++)
1453                 usb_kill_urb(acm->read_urbs[i]);
1454
1455         cancel_work_sync(&acm->work);
1456 }
1457
1458 static void acm_disconnect(struct usb_interface *intf)
1459 {
1460         struct acm *acm = usb_get_intfdata(intf);
1461         struct usb_device *usb_dev = interface_to_usbdev(intf);
1462         struct tty_struct *tty;
1463         int i;
1464
1465         dev_dbg(&intf->dev, "%s\n", __func__);
1466
1467         /* sibling interface is already cleaning up */
1468         if (!acm)
1469                 return;
1470
1471         mutex_lock(&acm->mutex);
1472         acm->disconnected = true;
1473         if (acm->country_codes) {
1474                 device_remove_file(&acm->control->dev,
1475                                 &dev_attr_wCountryCodes);
1476                 device_remove_file(&acm->control->dev,
1477                                 &dev_attr_iCountryCodeRelDate);
1478         }
1479         wake_up_all(&acm->wioctl);
1480         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1481         usb_set_intfdata(acm->control, NULL);
1482         usb_set_intfdata(acm->data, NULL);
1483         mutex_unlock(&acm->mutex);
1484
1485         tty = tty_port_tty_get(&acm->port);
1486         if (tty) {
1487                 tty_vhangup(tty);
1488                 tty_kref_put(tty);
1489         }
1490
1491         stop_data_traffic(acm);
1492
1493         tty_unregister_device(acm_tty_driver, acm->minor);
1494
1495         usb_free_urb(acm->ctrlurb);
1496         for (i = 0; i < ACM_NW; i++)
1497                 usb_free_urb(acm->wb[i].urb);
1498         for (i = 0; i < acm->rx_buflimit; i++)
1499                 usb_free_urb(acm->read_urbs[i]);
1500         acm_write_buffers_free(acm);
1501         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1502         acm_read_buffers_free(acm);
1503
1504         if (!acm->combined_interfaces)
1505                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1506                                         acm->data : acm->control);
1507
1508         tty_port_put(&acm->port);
1509 }
1510
1511 #ifdef CONFIG_PM
1512 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1513 {
1514         struct acm *acm = usb_get_intfdata(intf);
1515         int cnt;
1516
1517         spin_lock_irq(&acm->read_lock);
1518         spin_lock(&acm->write_lock);
1519         if (PMSG_IS_AUTO(message)) {
1520                 if (acm->transmitting) {
1521                         spin_unlock(&acm->write_lock);
1522                         spin_unlock_irq(&acm->read_lock);
1523                         return -EBUSY;
1524                 }
1525         }
1526         cnt = acm->susp_count++;
1527         spin_unlock(&acm->write_lock);
1528         spin_unlock_irq(&acm->read_lock);
1529
1530         if (cnt)
1531                 return 0;
1532
1533         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1534                 stop_data_traffic(acm);
1535
1536         return 0;
1537 }
1538
1539 static int acm_resume(struct usb_interface *intf)
1540 {
1541         struct acm *acm = usb_get_intfdata(intf);
1542         struct acm_wb *wb;
1543         int rv = 0;
1544
1545         spin_lock_irq(&acm->read_lock);
1546         spin_lock(&acm->write_lock);
1547
1548         if (--acm->susp_count)
1549                 goto out;
1550
1551         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1552                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1553
1554                 if (acm->delayed_wb) {
1555                         wb = acm->delayed_wb;
1556                         acm->delayed_wb = NULL;
1557                         acm_start_wb(acm, wb);
1558                 }
1559
1560                 /*
1561                  * delayed error checking because we must
1562                  * do the write path at all cost
1563                  */
1564                 if (rv < 0)
1565                         goto out;
1566
1567                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1568         }
1569 out:
1570         spin_unlock(&acm->write_lock);
1571         spin_unlock_irq(&acm->read_lock);
1572
1573         return rv;
1574 }
1575
1576 static int acm_reset_resume(struct usb_interface *intf)
1577 {
1578         struct acm *acm = usb_get_intfdata(intf);
1579
1580         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1581                 tty_port_tty_hangup(&acm->port, false);
1582
1583         return acm_resume(intf);
1584 }
1585
1586 #endif /* CONFIG_PM */
1587
1588 #define NOKIA_PCSUITE_ACM_INFO(x) \
1589                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1590                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1591                 USB_CDC_ACM_PROTO_VENDOR)
1592
1593 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1594                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1595                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1596                 USB_CDC_ACM_PROTO_VENDOR)
1597
1598 /*
1599  * USB driver structure.
1600  */
1601
1602 static const struct usb_device_id acm_ids[] = {
1603         /* quirky and broken devices */
1604         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1605         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1606         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1607         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1608         },
1609         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1610         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1611         },
1612         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1613         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1614         },
1615         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1616         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1617         },
1618         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1619         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1620         },
1621         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1622         .driver_info = SINGLE_RX_URB,
1623         },
1624         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1625         .driver_info = SINGLE_RX_URB, /* firmware bug */
1626         },
1627         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1628         .driver_info = SINGLE_RX_URB, /* firmware bug */
1629         },
1630         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1631         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1632         },
1633         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1634         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1635         },
1636         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1637         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1638         },
1639         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1640         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1641         },
1642         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1643         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1644         },
1645         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1646         },
1647         /* Motorola H24 HSPA module: */
1648         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1649         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1650         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1651         },
1652         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1653         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1654         },
1655         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1656         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1657         },
1658         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1659         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1660         },
1661         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1662         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1663         },
1664         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1665         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1666         },
1667         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1668         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1669         },
1670
1671         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1672         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1673                                            data interface instead of
1674                                            communications interface.
1675                                            Maybe we should define a new
1676                                            quirk for this. */
1677         },
1678         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1679         .driver_info = NO_UNION_NORMAL,
1680         },
1681         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1682         .driver_info = NO_UNION_NORMAL,
1683         },
1684         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1685         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1686         },
1687         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1688         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1689         },
1690
1691         /* Nokia S60 phones expose two ACM channels. The first is
1692          * a modem and is picked up by the standard AT-command
1693          * information below. The second is 'vendor-specific' but
1694          * is treated as a serial device at the S60 end, so we want
1695          * to expose it on Linux too. */
1696         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1697         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1698         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1699         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1700         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1701         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1702         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1703         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1704         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1705         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1706         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1707         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1708         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1709         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1710         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1711         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1712         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1713         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1714         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1715         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1716         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1717         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1718         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1719         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1720         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1721         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1722         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1723         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1724         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1725         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1726         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1727         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1728         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1729         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1730         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1731         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1732         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1733         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1734         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1735         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1736         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1737         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1738         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1739         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1740         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1741         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1742         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1743         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1744         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1745         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1746         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1747         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1748         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1749         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1750         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1751         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1752         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1753         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1754
1755         /* Support for Owen devices */
1756         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1757
1758         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1759
1760         /* Support Lego NXT using pbLua firmware */
1761         { USB_DEVICE(0x0694, 0xff00),
1762         .driver_info = NOT_A_MODEM,
1763         },
1764
1765         /* Support for Droids MuIn LCD */
1766         { USB_DEVICE(0x04d8, 0x000b),
1767         .driver_info = NO_DATA_INTERFACE,
1768         },
1769
1770 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1771         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1772         .driver_info = IGNORE_DEVICE,
1773         },
1774         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1775         .driver_info = IGNORE_DEVICE,
1776         },
1777 #endif
1778
1779         /* control interfaces without any protocol set */
1780         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1781                 USB_CDC_PROTO_NONE) },
1782
1783         /* control interfaces with various AT-command sets */
1784         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1785                 USB_CDC_ACM_PROTO_AT_V25TER) },
1786         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1787                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1788         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1789                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1790         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1791                 USB_CDC_ACM_PROTO_AT_GSM) },
1792         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1793                 USB_CDC_ACM_PROTO_AT_3G) },
1794         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1795                 USB_CDC_ACM_PROTO_AT_CDMA) },
1796
1797         { }
1798 };
1799
1800 MODULE_DEVICE_TABLE(usb, acm_ids);
1801
1802 static struct usb_driver acm_driver = {
1803         .name =         "cdc_acm",
1804         .probe =        acm_probe,
1805         .disconnect =   acm_disconnect,
1806 #ifdef CONFIG_PM
1807         .suspend =      acm_suspend,
1808         .resume =       acm_resume,
1809         .reset_resume = acm_reset_resume,
1810 #endif
1811         .id_table =     acm_ids,
1812 #ifdef CONFIG_PM
1813         .supports_autosuspend = 1,
1814 #endif
1815         .disable_hub_initiated_lpm = 1,
1816 };
1817
1818 /*
1819  * TTY driver structures.
1820  */
1821
1822 static const struct tty_operations acm_ops = {
1823         .install =              acm_tty_install,
1824         .open =                 acm_tty_open,
1825         .close =                acm_tty_close,
1826         .cleanup =              acm_tty_cleanup,
1827         .hangup =               acm_tty_hangup,
1828         .write =                acm_tty_write,
1829         .write_room =           acm_tty_write_room,
1830         .ioctl =                acm_tty_ioctl,
1831         .throttle =             acm_tty_throttle,
1832         .unthrottle =           acm_tty_unthrottle,
1833         .chars_in_buffer =      acm_tty_chars_in_buffer,
1834         .break_ctl =            acm_tty_break_ctl,
1835         .set_termios =          acm_tty_set_termios,
1836         .tiocmget =             acm_tty_tiocmget,
1837         .tiocmset =             acm_tty_tiocmset,
1838 };
1839
1840 /*
1841  * Init / exit.
1842  */
1843
1844 static int __init acm_init(void)
1845 {
1846         int retval;
1847         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1848         if (!acm_tty_driver)
1849                 return -ENOMEM;
1850         acm_tty_driver->driver_name = "acm",
1851         acm_tty_driver->name = "ttyACM",
1852         acm_tty_driver->major = ACM_TTY_MAJOR,
1853         acm_tty_driver->minor_start = 0,
1854         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1855         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1856         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1857         acm_tty_driver->init_termios = tty_std_termios;
1858         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1859                                                                 HUPCL | CLOCAL;
1860         tty_set_operations(acm_tty_driver, &acm_ops);
1861
1862         retval = tty_register_driver(acm_tty_driver);
1863         if (retval) {
1864                 put_tty_driver(acm_tty_driver);
1865                 return retval;
1866         }
1867
1868         retval = usb_register(&acm_driver);
1869         if (retval) {
1870                 tty_unregister_driver(acm_tty_driver);
1871                 put_tty_driver(acm_tty_driver);
1872                 return retval;
1873         }
1874
1875         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1876
1877         return 0;
1878 }
1879
1880 static void __exit acm_exit(void)
1881 {
1882         usb_deregister(&acm_driver);
1883         tty_unregister_driver(acm_tty_driver);
1884         put_tty_driver(acm_tty_driver);
1885 }
1886
1887 module_init(acm_init);
1888 module_exit(acm_exit);
1889
1890 MODULE_AUTHOR(DRIVER_AUTHOR);
1891 MODULE_DESCRIPTION(DRIVER_DESC);
1892 MODULE_LICENSE("GPL");
1893 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);