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/idr.h>
  50 #include <linux/list.h>
  51
  52 #include "cdc-acm.h"
  53
  54
  55 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  56 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  57
  58 static struct usb_driver acm_driver;
  59 static struct tty_driver *acm_tty_driver;
  60
  61 static DEFINE_IDR(acm_minors);
  62 static DEFINE_MUTEX(acm_minors_lock);
  63
  64 static void acm_tty_set_termios(struct tty_struct *tty,
  65                                 struct ktermios *termios_old);
  66
  67 /*
  68  * acm_minors accessors
  69  */
  70
  71 /*
  72  * Look up an ACM structure by minor. If found and not disconnected, increment
  73  * its refcount and return it with its mutex held.
  74  */
  75 static struct acm *acm_get_by_minor(unsigned int minor)
  76 {
  77         struct acm *acm;
  78
  79         mutex_lock(&acm_minors_lock);
  80         acm = idr_find(&acm_minors, minor);
  81         if (acm) {
  82                 mutex_lock(&acm->mutex);
  83                 if (acm->disconnected) {
  84                         mutex_unlock(&acm->mutex);
  85                         acm = NULL;
  86                 } else {
  87                         tty_port_get(&acm->port);
  88                         mutex_unlock(&acm->mutex);
  89                 }
  90         }
  91         mutex_unlock(&acm_minors_lock);
  92         return acm;
  93 }
  94
  95 /*
  96  * Try to find an available minor number and if found, associate it with 'acm'.
  97  */
  98 static int acm_alloc_minor(struct acm *acm)
  99 {
 100         int minor;
 101
 102         mutex_lock(&acm_minors_lock);
 103         minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
 104         mutex_unlock(&acm_minors_lock);
 105
 106         return minor;
 107 }
 108
 109 /* Release the minor number associated with 'acm'.  */
 110 static void acm_release_minor(struct acm *acm)
 111 {
 112         mutex_lock(&acm_minors_lock);
 113         idr_remove(&acm_minors, acm->minor);
 114         mutex_unlock(&acm_minors_lock);
 115 }
 116
 117 /*
 118  * Functions for ACM control messages.
 119  */
 120
 121 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 122                                                         void *buf, int len)
 123 {
 124         int retval;
 125
 126         retval = usb_autopm_get_interface(acm->control);
 127         if (retval)
 128                 return retval;
 129
 130         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 131                 request, USB_RT_ACM, value,
 132                 acm->control->altsetting[0].desc.bInterfaceNumber,
 133                 buf, len, 5000);
 134
 135         dev_dbg(&acm->control->dev,
 136                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 137                         __func__, request, value, len, retval);
 138
 139         usb_autopm_put_interface(acm->control);
 140
 141         return retval < 0 ? retval : 0;
 142 }
 143
 144 /* devices aren't required to support these requests.
 145  * the cdc acm descriptor tells whether they do...
 146  */
 147 static inline int acm_set_control(struct acm *acm, int control)
 148 {
 149         if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
 150                 return -EOPNOTSUPP;
 151
 152         return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
 153                         control, NULL, 0);
 154 }
 155
 156 #define acm_set_line(acm, line) \
 157         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 158 #define acm_send_break(acm, ms) \
 159         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 160
 161 /*
 162  * Write buffer management.
 163  * All of these assume proper locks taken by the caller.
 164  */
 165
 166 static int acm_wb_alloc(struct acm *acm)
 167 {
 168         int i, wbn;
 169         struct acm_wb *wb;
 170
 171         wbn = 0;
 172         i = 0;
 173         for (;;) {
 174                 wb = &acm->wb[wbn];
 175                 if (!wb->use) {
 176                         wb->use = 1;
 177                         return wbn;
 178                 }
 179                 wbn = (wbn + 1) % ACM_NW;
 180                 if (++i >= ACM_NW)
 181                         return -1;
 182         }
 183 }
 184
 185 static int acm_wb_is_avail(struct acm *acm)
 186 {
 187         int i, n;
 188         unsigned long flags;
 189
 190         n = ACM_NW;
 191         spin_lock_irqsave(&acm->write_lock, flags);
 192         for (i = 0; i < ACM_NW; i++)
 193                 n -= acm->wb[i].use;
 194         spin_unlock_irqrestore(&acm->write_lock, flags);
 195         return n;
 196 }
 197
 198 /*
 199  * Finish write. Caller must hold acm->write_lock
 200  */
 201 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 202 {
 203         wb->use = 0;
 204         acm->transmitting--;
 205         usb_autopm_put_interface_async(acm->control);
 206 }
 207
 208 /*
 209  * Poke write.
 210  *
 211  * the caller is responsible for locking
 212  */
 213
 214 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 215 {
 216         int rc;
 217
 218         acm->transmitting++;
 219
 220         wb->urb->transfer_buffer = wb->buf;
 221         wb->urb->transfer_dma = wb->dmah;
 222         wb->urb->transfer_buffer_length = wb->len;
 223         wb->urb->dev = acm->dev;
 224
 225         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 226         if (rc < 0) {
 227                 dev_err(&acm->data->dev,
 228                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 229                         __func__, rc);
 230                 acm_write_done(acm, wb);
 231         }
 232         return rc;
 233 }
 234
 235 /*
 236  * attributes exported through sysfs
 237  */
 238 static ssize_t show_caps
 239 (struct device *dev, struct device_attribute *attr, char *buf)
 240 {
 241         struct usb_interface *intf = to_usb_interface(dev);
 242         struct acm *acm = usb_get_intfdata(intf);
 243
 244         return sprintf(buf, "%d", acm->ctrl_caps);
 245 }
 246 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 247
 248 static ssize_t show_country_codes
 249 (struct device *dev, struct device_attribute *attr, char *buf)
 250 {
 251         struct usb_interface *intf = to_usb_interface(dev);
 252         struct acm *acm = usb_get_intfdata(intf);
 253
 254         memcpy(buf, acm->country_codes, acm->country_code_size);
 255         return acm->country_code_size;
 256 }
 257
 258 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 259
 260 static ssize_t show_country_rel_date
 261 (struct device *dev, struct device_attribute *attr, char *buf)
 262 {
 263         struct usb_interface *intf = to_usb_interface(dev);
 264         struct acm *acm = usb_get_intfdata(intf);
 265
 266         return sprintf(buf, "%d", acm->country_rel_date);
 267 }
 268
 269 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 270 /*
 271  * Interrupt handlers for various ACM device responses
 272  */
 273
 274 /* control interface reports status changes with "interrupt" transfers */
 275 static void acm_ctrl_irq(struct urb *urb)
 276 {
 277         struct acm *acm = urb->context;
 278         struct usb_cdc_notification *dr = urb->transfer_buffer;
 279         unsigned char *data;
 280         int newctrl;
 281         int difference;
 282         int retval;
 283         int status = urb->status;
 284
 285         switch (status) {
 286         case 0:
 287                 /* success */
 288                 break;
 289         case -ECONNRESET:
 290         case -ENOENT:
 291         case -ESHUTDOWN:
 292                 /* this urb is terminated, clean up */
 293                 dev_dbg(&acm->control->dev,
 294                                 "%s - urb shutting down with status: %d\n",
 295                                 __func__, status);
 296                 return;
 297         default:
 298                 dev_dbg(&acm->control->dev,
 299                                 "%s - nonzero urb status received: %d\n",
 300                                 __func__, status);
 301                 goto exit;
 302         }
 303
 304         usb_mark_last_busy(acm->dev);
 305
 306         data = (unsigned char *)(dr + 1);
 307         switch (dr->bNotificationType) {
 308         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 309                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
 310                                                         __func__, dr->wValue);
 311                 break;
 312
 313         case USB_CDC_NOTIFY_SERIAL_STATE:
 314                 newctrl = get_unaligned_le16(data);
 315
 316                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 317                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
 318                                         __func__);
 319                         tty_port_tty_hangup(&acm->port, false);
 320                 }
 321
 322                 difference = acm->ctrlin ^ newctrl;
 323                 spin_lock(&acm->read_lock);
 324                 acm->ctrlin = newctrl;
 325                 acm->oldcount = acm->iocount;
 326
 327                 if (difference & ACM_CTRL_DSR)
 328                         acm->iocount.dsr++;
 329                 if (difference & ACM_CTRL_BRK)
 330                         acm->iocount.brk++;
 331                 if (difference & ACM_CTRL_RI)
 332                         acm->iocount.rng++;
 333                 if (difference & ACM_CTRL_DCD)
 334                         acm->iocount.dcd++;
 335                 if (difference & ACM_CTRL_FRAMING)
 336                         acm->iocount.frame++;
 337                 if (difference & ACM_CTRL_PARITY)
 338                         acm->iocount.parity++;
 339                 if (difference & ACM_CTRL_OVERRUN)
 340                         acm->iocount.overrun++;
 341                 spin_unlock(&acm->read_lock);
 342
 343                 if (difference)
 344                         wake_up_all(&acm->wioctl);
 345
 346                 break;
 347
 348         default:
 349                 dev_dbg(&acm->control->dev,
 350                         "%s - unknown notification %d received: index %d "
 351                         "len %d data0 %d data1 %d\n",
 352                         __func__,
 353                         dr->bNotificationType, dr->wIndex,
 354                         dr->wLength, data[0], data[1]);
 355                 break;
 356         }
 357 exit:
 358         retval = usb_submit_urb(urb, GFP_ATOMIC);
 359         if (retval && retval != -EPERM)
 360                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 361                                                         __func__, retval);
 362 }
 363
 364 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 365 {
 366         int res;
 367
 368         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 369                 return 0;
 370
 371         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
 372
 373         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 374         if (res) {
 375                 if (res != -EPERM) {
 376                         dev_err(&acm->data->dev,
 377                                         "%s - usb_submit_urb failed: %d\n",
 378                                         __func__, res);
 379                 }
 380                 set_bit(index, &acm->read_urbs_free);
 381                 return res;
 382         }
 383
 384         return 0;
 385 }
 386
 387 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 388 {
 389         int res;
 390         int i;
 391
 392         for (i = 0; i < acm->rx_buflimit; ++i) {
 393                 res = acm_submit_read_urb(acm, i, mem_flags);
 394                 if (res)
 395                         return res;
 396         }
 397
 398         return 0;
 399 }
 400
 401 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 402 {
 403         if (!urb->actual_length)
 404                 return;
 405
 406         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 407                         urb->actual_length);
 408         tty_flip_buffer_push(&acm->port);
 409 }
 410
 411 static void acm_read_bulk_callback(struct urb *urb)
 412 {
 413         struct acm_rb *rb = urb->context;
 414         struct acm *acm = rb->instance;
 415         unsigned long flags;
 416         int status = urb->status;
 417
 418         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
 419                                         rb->index, urb->actual_length);
 420
 421         if (!acm->dev) {
 422                 set_bit(rb->index, &acm->read_urbs_free);
 423                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 424                 return;
 425         }
 426
 427         if (status) {
 428                 set_bit(rb->index, &acm->read_urbs_free);
 429                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
 430                                                         __func__, status);
 431                 if ((status != -ENOENT) || (urb->actual_length == 0))
 432                         return;
 433         }
 434
 435         usb_mark_last_busy(acm->dev);
 436
 437         acm_process_read_urb(acm, urb);
 438         /*
 439          * Unthrottle may run on another CPU which needs to see events
 440          * in the same order. Submission has an implict barrier
 441          */
 442         smp_mb__before_atomic();
 443         set_bit(rb->index, &acm->read_urbs_free);
 444
 445         /* throttle device if requested by tty */
 446         spin_lock_irqsave(&acm->read_lock, flags);
 447         acm->throttled = acm->throttle_req;
 448         if (!acm->throttled) {
 449                 spin_unlock_irqrestore(&acm->read_lock, flags);
 450                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 451         } else {
 452                 spin_unlock_irqrestore(&acm->read_lock, flags);
 453         }
 454 }
 455
 456 /* data interface wrote those outgoing bytes */
 457 static void acm_write_bulk(struct urb *urb)
 458 {
 459         struct acm_wb *wb = urb->context;
 460         struct acm *acm = wb->instance;
 461         unsigned long flags;
 462         int status = urb->status;
 463
 464         if (status || (urb->actual_length != urb->transfer_buffer_length))
 465                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
 466                         __func__,
 467                         urb->actual_length,
 468                         urb->transfer_buffer_length,
 469                         status);
 470
 471         spin_lock_irqsave(&acm->write_lock, flags);
 472         acm_write_done(acm, wb);
 473         spin_unlock_irqrestore(&acm->write_lock, flags);
 474         schedule_work(&acm->work);
 475 }
 476
 477 static void acm_softint(struct work_struct *work)
 478 {
 479         struct acm *acm = container_of(work, struct acm, work);
 480
 481         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 482
 483         tty_port_tty_wakeup(&acm->port);
 484 }
 485
 486 /*
 487  * TTY handlers
 488  */
 489
 490 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 491 {
 492         struct acm *acm;
 493         int retval;
 494
 495         dev_dbg(tty->dev, "%s\n", __func__);
 496
 497         acm = acm_get_by_minor(tty->index);
 498         if (!acm)
 499                 return -ENODEV;
 500
 501         retval = tty_standard_install(driver, tty);
 502         if (retval)
 503                 goto error_init_termios;
 504
 505         tty->driver_data = acm;
 506
 507         return 0;
 508
 509 error_init_termios:
 510         tty_port_put(&acm->port);
 511         return retval;
 512 }
 513
 514 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 515 {
 516         struct acm *acm = tty->driver_data;
 517
 518         dev_dbg(tty->dev, "%s\n", __func__);
 519
 520         return tty_port_open(&acm->port, tty, filp);
 521 }
 522
 523 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 524 {
 525         struct acm *acm = container_of(port, struct acm, port);
 526         int val;
 527         int res;
 528
 529         if (raise)
 530                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 531         else
 532                 val = 0;
 533
 534         /* FIXME: add missing ctrlout locking throughout driver */
 535         acm->ctrlout = val;
 536
 537         res = acm_set_control(acm, val);
 538         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 539                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
 540 }
 541
 542 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 543 {
 544         struct acm *acm = container_of(port, struct acm, port);
 545         int retval = -ENODEV;
 546         int i;
 547
 548         dev_dbg(&acm->control->dev, "%s\n", __func__);
 549
 550         mutex_lock(&acm->mutex);
 551         if (acm->disconnected)
 552                 goto disconnected;
 553
 554         retval = usb_autopm_get_interface(acm->control);
 555         if (retval)
 556                 goto error_get_interface;
 557
 558         /*
 559          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 560          * memory is really nasty...
 561          */
 562         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 563         acm->control->needs_remote_wakeup = 1;
 564
 565         acm->ctrlurb->dev = acm->dev;
 566         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 567         if (retval) {
 568                 dev_err(&acm->control->dev,
 569                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 570                 goto error_submit_urb;
 571         }
 572
 573         acm_tty_set_termios(tty, NULL);
 574
 575         /*
 576          * Unthrottle device in case the TTY was closed while throttled.
 577          */
 578         spin_lock_irq(&acm->read_lock);
 579         acm->throttled = 0;
 580         acm->throttle_req = 0;
 581         spin_unlock_irq(&acm->read_lock);
 582
 583         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 584         if (retval)
 585                 goto error_submit_read_urbs;
 586
 587         usb_autopm_put_interface(acm->control);
 588
 589         mutex_unlock(&acm->mutex);
 590
 591         return 0;
 592
 593 error_submit_read_urbs:
 594         for (i = 0; i < acm->rx_buflimit; i++)
 595                 usb_kill_urb(acm->read_urbs[i]);
 596         usb_kill_urb(acm->ctrlurb);
 597 error_submit_urb:
 598         usb_autopm_put_interface(acm->control);
 599 error_get_interface:
 600 disconnected:
 601         mutex_unlock(&acm->mutex);
 602
 603         return usb_translate_errors(retval);
 604 }
 605
 606 static void acm_port_destruct(struct tty_port *port)
 607 {
 608         struct acm *acm = container_of(port, struct acm, port);
 609
 610         dev_dbg(&acm->control->dev, "%s\n", __func__);
 611
 612         acm_release_minor(acm);
 613         usb_put_intf(acm->control);
 614         kfree(acm->country_codes);
 615         kfree(acm);
 616 }
 617
 618 static void acm_port_shutdown(struct tty_port *port)
 619 {
 620         struct acm *acm = container_of(port, struct acm, port);
 621         struct urb *urb;
 622         struct acm_wb *wb;
 623         int i;
 624
 625         dev_dbg(&acm->control->dev, "%s\n", __func__);
 626
 627         /*
 628          * Need to grab write_lock to prevent race with resume, but no need to
 629          * hold it due to the tty-port initialised flag.
 630          */
 631         spin_lock_irq(&acm->write_lock);
 632         spin_unlock_irq(&acm->write_lock);
 633
 634         usb_autopm_get_interface_no_resume(acm->control);
 635         acm->control->needs_remote_wakeup = 0;
 636         usb_autopm_put_interface(acm->control);
 637
 638         for (;;) {
 639                 urb = usb_get_from_anchor(&acm->delayed);
 640                 if (!urb)
 641                         break;
 642                 wb = urb->context;
 643                 wb->use = 0;
 644                 usb_autopm_put_interface_async(acm->control);
 645         }
 646
 647         usb_kill_urb(acm->ctrlurb);
 648         for (i = 0; i < ACM_NW; i++)
 649                 usb_kill_urb(acm->wb[i].urb);
 650         for (i = 0; i < acm->rx_buflimit; i++)
 651                 usb_kill_urb(acm->read_urbs[i]);
 652 }
 653
 654 static void acm_tty_cleanup(struct tty_struct *tty)
 655 {
 656         struct acm *acm = tty->driver_data;
 657         dev_dbg(&acm->control->dev, "%s\n", __func__);
 658         tty_port_put(&acm->port);
 659 }
 660
 661 static void acm_tty_hangup(struct tty_struct *tty)
 662 {
 663         struct acm *acm = tty->driver_data;
 664         dev_dbg(&acm->control->dev, "%s\n", __func__);
 665         tty_port_hangup(&acm->port);
 666 }
 667
 668 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 669 {
 670         struct acm *acm = tty->driver_data;
 671         dev_dbg(&acm->control->dev, "%s\n", __func__);
 672         tty_port_close(&acm->port, tty, filp);
 673 }
 674
 675 static int acm_tty_write(struct tty_struct *tty,
 676                                         const unsigned char *buf, int count)
 677 {
 678         struct acm *acm = tty->driver_data;
 679         int stat;
 680         unsigned long flags;
 681         int wbn;
 682         struct acm_wb *wb;
 683
 684         if (!count)
 685                 return 0;
 686
 687         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 688
 689         spin_lock_irqsave(&acm->write_lock, flags);
 690         wbn = acm_wb_alloc(acm);
 691         if (wbn < 0) {
 692                 spin_unlock_irqrestore(&acm->write_lock, flags);
 693                 return 0;
 694         }
 695         wb = &acm->wb[wbn];
 696
 697         if (!acm->dev) {
 698                 wb->use = 0;
 699                 spin_unlock_irqrestore(&acm->write_lock, flags);
 700                 return -ENODEV;
 701         }
 702
 703         count = (count > acm->writesize) ? acm->writesize : count;
 704         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 705         memcpy(wb->buf, buf, count);
 706         wb->len = count;
 707
 708         stat = usb_autopm_get_interface_async(acm->control);
 709         if (stat) {
 710                 wb->use = 0;
 711                 spin_unlock_irqrestore(&acm->write_lock, flags);
 712                 return stat;
 713         }
 714
 715         if (acm->susp_count) {
 716                 usb_anchor_urb(wb->urb, &acm->delayed);
 717                 spin_unlock_irqrestore(&acm->write_lock, flags);
 718                 return count;
 719         }
 720
 721         stat = acm_start_wb(acm, wb);
 722         spin_unlock_irqrestore(&acm->write_lock, flags);
 723
 724         if (stat < 0)
 725                 return stat;
 726         return count;
 727 }
 728
 729 static int acm_tty_write_room(struct tty_struct *tty)
 730 {
 731         struct acm *acm = tty->driver_data;
 732         /*
 733          * Do not let the line discipline to know that we have a reserve,
 734          * or it might get too enthusiastic.
 735          */
 736         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 737 }
 738
 739 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 740 {
 741         struct acm *acm = tty->driver_data;
 742         /*
 743          * if the device was unplugged then any remaining characters fell out
 744          * of the connector ;)
 745          */
 746         if (acm->disconnected)
 747                 return 0;
 748         /*
 749          * This is inaccurate (overcounts), but it works.
 750          */
 751         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 752 }
 753
 754 static void acm_tty_throttle(struct tty_struct *tty)
 755 {
 756         struct acm *acm = tty->driver_data;
 757
 758         spin_lock_irq(&acm->read_lock);
 759         acm->throttle_req = 1;
 760         spin_unlock_irq(&acm->read_lock);
 761 }
 762
 763 static void acm_tty_unthrottle(struct tty_struct *tty)
 764 {
 765         struct acm *acm = tty->driver_data;
 766         unsigned int was_throttled;
 767
 768         spin_lock_irq(&acm->read_lock);
 769         was_throttled = acm->throttled;
 770         acm->throttled = 0;
 771         acm->throttle_req = 0;
 772         spin_unlock_irq(&acm->read_lock);
 773
 774         if (was_throttled)
 775                 acm_submit_read_urbs(acm, GFP_KERNEL);
 776 }
 777
 778 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 779 {
 780         struct acm *acm = tty->driver_data;
 781         int retval;
 782
 783         retval = acm_send_break(acm, state ? 0xffff : 0);
 784         if (retval < 0)
 785                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 786                                                                 __func__);
 787         return retval;
 788 }
 789
 790 static int acm_tty_tiocmget(struct tty_struct *tty)
 791 {
 792         struct acm *acm = tty->driver_data;
 793
 794         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 795                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 796                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 797                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 798                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 799                TIOCM_CTS;
 800 }
 801
 802 static int acm_tty_tiocmset(struct tty_struct *tty,
 803                             unsigned int set, unsigned int clear)
 804 {
 805         struct acm *acm = tty->driver_data;
 806         unsigned int newctrl;
 807
 808         newctrl = acm->ctrlout;
 809         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 810                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 811         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 812                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 813
 814         newctrl = (newctrl & ~clear) | set;
 815
 816         if (acm->ctrlout == newctrl)
 817                 return 0;
 818         return acm_set_control(acm, acm->ctrlout = newctrl);
 819 }
 820
 821 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 822 {
 823         struct serial_struct tmp;
 824
 825         if (!info)
 826                 return -EINVAL;
 827
 828         memset(&tmp, 0, sizeof(tmp));
 829         tmp.flags = ASYNC_LOW_LATENCY;
 830         tmp.xmit_fifo_size = acm->writesize;
 831         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 832         tmp.close_delay = acm->port.close_delay / 10;
 833         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 834                                 ASYNC_CLOSING_WAIT_NONE :
 835                                 acm->port.closing_wait / 10;
 836
 837         if (copy_to_user(info, &tmp, sizeof(tmp)))
 838                 return -EFAULT;
 839         else
 840                 return 0;
 841 }
 842
 843 static int set_serial_info(struct acm *acm,
 844                                 struct serial_struct __user *newinfo)
 845 {
 846         struct serial_struct new_serial;
 847         unsigned int closing_wait, close_delay;
 848         int retval = 0;
 849
 850         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 851                 return -EFAULT;
 852
 853         close_delay = new_serial.close_delay * 10;
 854         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 855                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 856
 857         mutex_lock(&acm->port.mutex);
 858
 859         if (!capable(CAP_SYS_ADMIN)) {
 860                 if ((close_delay != acm->port.close_delay) ||
 861                     (closing_wait != acm->port.closing_wait))
 862                         retval = -EPERM;
 863                 else
 864                         retval = -EOPNOTSUPP;
 865         } else {
 866                 acm->port.close_delay  = close_delay;
 867                 acm->port.closing_wait = closing_wait;
 868         }
 869
 870         mutex_unlock(&acm->port.mutex);
 871         return retval;
 872 }
 873
 874 static int wait_serial_change(struct acm *acm, unsigned long arg)
 875 {
 876         int rv = 0;
 877         DECLARE_WAITQUEUE(wait, current);
 878         struct async_icount old, new;
 879
 880         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
 881                 return -EINVAL;
 882         do {
 883                 spin_lock_irq(&acm->read_lock);
 884                 old = acm->oldcount;
 885                 new = acm->iocount;
 886                 acm->oldcount = new;
 887                 spin_unlock_irq(&acm->read_lock);
 888
 889                 if ((arg & TIOCM_DSR) &&
 890                         old.dsr != new.dsr)
 891                         break;
 892                 if ((arg & TIOCM_CD)  &&
 893                         old.dcd != new.dcd)
 894                         break;
 895                 if ((arg & TIOCM_RI) &&
 896                         old.rng != new.rng)
 897                         break;
 898
 899                 add_wait_queue(&acm->wioctl, &wait);
 900                 set_current_state(TASK_INTERRUPTIBLE);
 901                 schedule();
 902                 remove_wait_queue(&acm->wioctl, &wait);
 903                 if (acm->disconnected) {
 904                         if (arg & TIOCM_CD)
 905                                 break;
 906                         else
 907                                 rv = -ENODEV;
 908                 } else {
 909                         if (signal_pending(current))
 910                                 rv = -ERESTARTSYS;
 911                 }
 912         } while (!rv);
 913
 914
 915
 916         return rv;
 917 }
 918
 919 static int get_serial_usage(struct acm *acm,
 920                             struct serial_icounter_struct __user *count)
 921 {
 922         struct serial_icounter_struct icount;
 923         int rv = 0;
 924
 925         memset(&icount, 0, sizeof(icount));
 926         icount.dsr = acm->iocount.dsr;
 927         icount.rng = acm->iocount.rng;
 928         icount.dcd = acm->iocount.dcd;
 929         icount.frame = acm->iocount.frame;
 930         icount.overrun = acm->iocount.overrun;
 931         icount.parity = acm->iocount.parity;
 932         icount.brk = acm->iocount.brk;
 933
 934         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 935                 rv = -EFAULT;
 936
 937         return rv;
 938 }
 939
 940 static int acm_tty_ioctl(struct tty_struct *tty,
 941                                         unsigned int cmd, unsigned long arg)
 942 {
 943         struct acm *acm = tty->driver_data;
 944         int rv = -ENOIOCTLCMD;
 945
 946         switch (cmd) {
 947         case TIOCGSERIAL: /* gets serial port data */
 948                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 949                 break;
 950         case TIOCSSERIAL:
 951                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 952                 break;
 953         case TIOCMIWAIT:
 954                 rv = usb_autopm_get_interface(acm->control);
 955                 if (rv < 0) {
 956                         rv = -EIO;
 957                         break;
 958                 }
 959                 rv = wait_serial_change(acm, arg);
 960                 usb_autopm_put_interface(acm->control);
 961                 break;
 962         case TIOCGICOUNT:
 963                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
 964                 break;
 965         }
 966
 967         return rv;
 968 }
 969
 970 static void acm_tty_set_termios(struct tty_struct *tty,
 971                                                 struct ktermios *termios_old)
 972 {
 973         struct acm *acm = tty->driver_data;
 974         struct ktermios *termios = &tty->termios;
 975         struct usb_cdc_line_coding newline;
 976         int newctrl = acm->ctrlout;
 977
 978         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 979         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 980         newline.bParityType = termios->c_cflag & PARENB ?
 981                                 (termios->c_cflag & PARODD ? 1 : 2) +
 982                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 983         switch (termios->c_cflag & CSIZE) {
 984         case CS5:
 985                 newline.bDataBits = 5;
 986                 break;
 987         case CS6:
 988                 newline.bDataBits = 6;
 989                 break;
 990         case CS7:
 991                 newline.bDataBits = 7;
 992                 break;
 993         case CS8:
 994         default:
 995                 newline.bDataBits = 8;
 996                 break;
 997         }
 998         /* FIXME: Needs to clear unsupported bits in the termios */
 999         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1000
1001         if (C_BAUD(tty) == B0) {
1002                 newline.dwDTERate = acm->line.dwDTERate;
1003                 newctrl &= ~ACM_CTRL_DTR;
1004         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1005                 newctrl |=  ACM_CTRL_DTR;
1006         }
1007
1008         if (newctrl != acm->ctrlout)
1009                 acm_set_control(acm, acm->ctrlout = newctrl);
1010
1011         if (memcmp(&acm->line, &newline, sizeof newline)) {
1012                 memcpy(&acm->line, &newline, sizeof newline);
1013                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1014                         __func__,
1015                         le32_to_cpu(newline.dwDTERate),
1016                         newline.bCharFormat, newline.bParityType,
1017                         newline.bDataBits);
1018                 acm_set_line(acm, &acm->line);
1019         }
1020 }
1021
1022 static const struct tty_port_operations acm_port_ops = {
1023         .dtr_rts = acm_port_dtr_rts,
1024         .shutdown = acm_port_shutdown,
1025         .activate = acm_port_activate,
1026         .destruct = acm_port_destruct,
1027 };
1028
1029 /*
1030  * USB probe and disconnect routines.
1031  */
1032
1033 /* Little helpers: write/read buffers free */
1034 static void acm_write_buffers_free(struct acm *acm)
1035 {
1036         int i;
1037         struct acm_wb *wb;
1038         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1039
1040         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1041                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1042 }
1043
1044 static void acm_read_buffers_free(struct acm *acm)
1045 {
1046         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1047         int i;
1048
1049         for (i = 0; i < acm->rx_buflimit; i++)
1050                 usb_free_coherent(usb_dev, acm->readsize,
1051                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1052 }
1053
1054 /* Little helper: write buffers allocate */
1055 static int acm_write_buffers_alloc(struct acm *acm)
1056 {
1057         int i;
1058         struct acm_wb *wb;
1059
1060         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1061                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1062                     &wb->dmah);
1063                 if (!wb->buf) {
1064                         while (i != 0) {
1065                                 --i;
1066                                 --wb;
1067                                 usb_free_coherent(acm->dev, acm->writesize,
1068                                     wb->buf, wb->dmah);
1069                         }
1070                         return -ENOMEM;
1071                 }
1072         }
1073         return 0;
1074 }
1075
1076 static int acm_probe(struct usb_interface *intf,
1077                      const struct usb_device_id *id)
1078 {
1079         struct usb_cdc_union_desc *union_header = NULL;
1080         struct usb_cdc_country_functional_desc *cfd = NULL;
1081         unsigned char *buffer = intf->altsetting->extra;
1082         int buflen = intf->altsetting->extralen;
1083         struct usb_interface *control_interface;
1084         struct usb_interface *data_interface;
1085         struct usb_endpoint_descriptor *epctrl = NULL;
1086         struct usb_endpoint_descriptor *epread = NULL;
1087         struct usb_endpoint_descriptor *epwrite = NULL;
1088         struct usb_device *usb_dev = interface_to_usbdev(intf);
1089         struct acm *acm;
1090         int minor;
1091         int ctrlsize, readsize;
1092         u8 *buf;
1093         u8 ac_management_function = 0;
1094         u8 call_management_function = 0;
1095         int call_interface_num = -1;
1096         int data_interface_num = -1;
1097         unsigned long quirks;
1098         int num_rx_buf;
1099         int i;
1100         unsigned int elength = 0;
1101         int combined_interfaces = 0;
1102         struct device *tty_dev;
1103         int rv = -ENOMEM;
1104
1105         /* normal quirks */
1106         quirks = (unsigned long)id->driver_info;
1107
1108         if (quirks == IGNORE_DEVICE)
1109                 return -ENODEV;
1110
1111         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1112
1113         /* handle quirks deadly to normal probing*/
1114         if (quirks == NO_UNION_NORMAL) {
1115                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1116                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1117                 /* we would crash */
1118                 if (!data_interface || !control_interface)
1119                         return -ENODEV;
1120                 goto skip_normal_probe;
1121         }
1122
1123         /* normal probing*/
1124         if (!buffer) {
1125                 dev_err(&intf->dev, "Weird descriptor references\n");
1126                 return -EINVAL;
1127         }
1128
1129         if (!buflen) {
1130                 if (intf->cur_altsetting->endpoint &&
1131                                 intf->cur_altsetting->endpoint->extralen &&
1132                                 intf->cur_altsetting->endpoint->extra) {
1133                         dev_dbg(&intf->dev,
1134                                 "Seeking extra descriptors on endpoint\n");
1135                         buflen = intf->cur_altsetting->endpoint->extralen;
1136                         buffer = intf->cur_altsetting->endpoint->extra;
1137                 } else {
1138                         dev_err(&intf->dev,
1139                                 "Zero length descriptor references\n");
1140                         return -EINVAL;
1141                 }
1142         }
1143
1144         while (buflen > 0) {
1145                 elength = buffer[0];
1146                 if (!elength) {
1147                         dev_err(&intf->dev, "skipping garbage byte\n");
1148                         elength = 1;
1149                         goto next_desc;
1150                 }
1151                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1152                         dev_err(&intf->dev, "skipping garbage\n");
1153                         goto next_desc;
1154                 }
1155
1156                 switch (buffer[2]) {
1157                 case USB_CDC_UNION_TYPE: /* we've found it */
1158                         if (elength < sizeof(struct usb_cdc_union_desc))
1159                                 goto next_desc;
1160                         if (union_header) {
1161                                 dev_err(&intf->dev, "More than one "
1162                                         "union descriptor, skipping ...\n");
1163                                 goto next_desc;
1164                         }
1165                         union_header = (struct usb_cdc_union_desc *)buffer;
1166                         break;
1167                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1168                         if (elength < sizeof(struct usb_cdc_country_functional_desc))
1169                                 goto next_desc;
1170                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1171                         break;
1172                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1173                         break; /* for now we ignore it */
1174                 case USB_CDC_ACM_TYPE:
1175                         if (elength < 4)
1176                                 goto next_desc;
1177                         ac_management_function = buffer[3];
1178                         break;
1179                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1180                         if (elength < 5)
1181                                 goto next_desc;
1182                         call_management_function = buffer[3];
1183                         call_interface_num = buffer[4];
1184                         break;
1185                 default:
1186                         /*
1187                          * there are LOTS more CDC descriptors that
1188                          * could legitimately be found here.
1189                          */
1190                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1191                                         "type %02x, length %ud\n",
1192                                         buffer[2], elength);
1193                         break;
1194                 }
1195 next_desc:
1196                 buflen -= elength;
1197                 buffer += elength;
1198         }
1199
1200         if (!union_header) {
1201                 if (call_interface_num > 0) {
1202                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1203                         /* quirks for Droids MuIn LCD */
1204                         if (quirks & NO_DATA_INTERFACE)
1205                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1206                         else
1207                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1208                         control_interface = intf;
1209                 } else {
1210                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1211                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1212                                 return -ENODEV;
1213                         } else {
1214                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1215                                 combined_interfaces = 1;
1216                                 control_interface = data_interface = intf;
1217                                 goto look_for_collapsed_interface;
1218                         }
1219                 }
1220         } else {
1221                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1222                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1223         }
1224
1225         if (!control_interface || !data_interface) {
1226                 dev_dbg(&intf->dev, "no interfaces\n");
1227                 return -ENODEV;
1228         }
1229
1230         if (data_interface_num != call_interface_num)
1231                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1232
1233         if (control_interface == data_interface) {
1234                 /* some broken devices designed for windows work this way */
1235                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1236                 combined_interfaces = 1;
1237                 /* a popular other OS doesn't use it */
1238                 quirks |= NO_CAP_LINE;
1239                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1240                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1241                         return -EINVAL;
1242                 }
1243 look_for_collapsed_interface:
1244                 for (i = 0; i < 3; i++) {
1245                         struct usb_endpoint_descriptor *ep;
1246                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1247
1248                         if (usb_endpoint_is_int_in(ep))
1249                                 epctrl = ep;
1250                         else if (usb_endpoint_is_bulk_out(ep))
1251                                 epwrite = ep;
1252                         else if (usb_endpoint_is_bulk_in(ep))
1253                                 epread = ep;
1254                         else
1255                                 return -EINVAL;
1256                 }
1257                 if (!epctrl || !epread || !epwrite)
1258                         return -ENODEV;
1259                 else
1260                         goto made_compressed_probe;
1261         }
1262
1263 skip_normal_probe:
1264
1265         /*workaround for switched interfaces */
1266         if (data_interface->cur_altsetting->desc.bInterfaceClass
1267                                                 != CDC_DATA_INTERFACE_TYPE) {
1268                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1269                                                 == CDC_DATA_INTERFACE_TYPE) {
1270                         dev_dbg(&intf->dev,
1271                                 "Your device has switched interfaces.\n");
1272                         swap(control_interface, data_interface);
1273                 } else {
1274                         return -EINVAL;
1275                 }
1276         }
1277
1278         /* Accept probe requests only for the control interface */
1279         if (!combined_interfaces && intf != control_interface)
1280                 return -ENODEV;
1281
1282         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1283                 /* valid in this context */
1284                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1285                 return -EBUSY;
1286         }
1287
1288
1289         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1290             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1291                 return -EINVAL;
1292
1293         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1294         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1295         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1296
1297
1298         /* workaround for switched endpoints */
1299         if (!usb_endpoint_dir_in(epread)) {
1300                 /* descriptors are swapped */
1301                 dev_dbg(&intf->dev,
1302                         "The data interface has switched endpoints\n");
1303                 swap(epread, epwrite);
1304         }
1305 made_compressed_probe:
1306         dev_dbg(&intf->dev, "interfaces are valid\n");
1307
1308         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1309         if (acm == NULL)
1310                 goto alloc_fail;
1311
1312         minor = acm_alloc_minor(acm);
1313         if (minor < 0) {
1314                 dev_err(&intf->dev, "no more free acm devices\n");
1315                 kfree(acm);
1316                 return -ENODEV;
1317         }
1318
1319         ctrlsize = usb_endpoint_maxp(epctrl);
1320         readsize = usb_endpoint_maxp(epread) *
1321                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1322         acm->combined_interfaces = combined_interfaces;
1323         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1324         acm->control = control_interface;
1325         acm->data = data_interface;
1326         acm->minor = minor;
1327         acm->dev = usb_dev;
1328         acm->ctrl_caps = ac_management_function;
1329         if (quirks & NO_CAP_LINE)
1330                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1331         acm->ctrlsize = ctrlsize;
1332         acm->readsize = readsize;
1333         acm->rx_buflimit = num_rx_buf;
1334         INIT_WORK(&acm->work, acm_softint);
1335         init_waitqueue_head(&acm->wioctl);
1336         spin_lock_init(&acm->write_lock);
1337         spin_lock_init(&acm->read_lock);
1338         mutex_init(&acm->mutex);
1339         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1340         if (acm->is_int_ep)
1341                 acm->bInterval = epread->bInterval;
1342         tty_port_init(&acm->port);
1343         acm->port.ops = &acm_port_ops;
1344         init_usb_anchor(&acm->delayed);
1345         acm->quirks = quirks;
1346
1347         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1348         if (!buf)
1349                 goto alloc_fail2;
1350         acm->ctrl_buffer = buf;
1351
1352         if (acm_write_buffers_alloc(acm) < 0)
1353                 goto alloc_fail4;
1354
1355         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1356         if (!acm->ctrlurb)
1357                 goto alloc_fail5;
1358
1359         for (i = 0; i < num_rx_buf; i++) {
1360                 struct acm_rb *rb = &(acm->read_buffers[i]);
1361                 struct urb *urb;
1362
1363                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1364                                                                 &rb->dma);
1365                 if (!rb->base)
1366                         goto alloc_fail6;
1367                 rb->index = i;
1368                 rb->instance = acm;
1369
1370                 urb = usb_alloc_urb(0, GFP_KERNEL);
1371                 if (!urb)
1372                         goto alloc_fail6;
1373
1374                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1375                 urb->transfer_dma = rb->dma;
1376                 if (acm->is_int_ep) {
1377                         usb_fill_int_urb(urb, acm->dev,
1378                                          usb_rcvintpipe(usb_dev, epread->bEndpointAddress),
1379                                          rb->base,
1380                                          acm->readsize,
1381                                          acm_read_bulk_callback, rb,
1382                                          acm->bInterval);
1383                 } else {
1384                         usb_fill_bulk_urb(urb, acm->dev,
1385                                           usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress),
1386                                           rb->base,
1387                                           acm->readsize,
1388                                           acm_read_bulk_callback, rb);
1389                 }
1390
1391                 acm->read_urbs[i] = urb;
1392                 __set_bit(i, &acm->read_urbs_free);
1393         }
1394         for (i = 0; i < ACM_NW; i++) {
1395                 struct acm_wb *snd = &(acm->wb[i]);
1396
1397                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1398                 if (snd->urb == NULL)
1399                         goto alloc_fail7;
1400
1401                 if (usb_endpoint_xfer_int(epwrite))
1402                         usb_fill_int_urb(snd->urb, usb_dev,
1403                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1404                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1405                 else
1406                         usb_fill_bulk_urb(snd->urb, usb_dev,
1407                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1408                                 NULL, acm->writesize, acm_write_bulk, snd);
1409                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1410                 if (quirks & SEND_ZERO_PACKET)
1411                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1412                 snd->instance = acm;
1413         }
1414
1415         usb_set_intfdata(intf, acm);
1416
1417         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1418         if (i < 0)
1419                 goto alloc_fail7;
1420
1421         if (cfd) { /* export the country data */
1422                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1423                 if (!acm->country_codes)
1424                         goto skip_countries;
1425                 acm->country_code_size = cfd->bLength - 4;
1426                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1427                                                         cfd->bLength - 4);
1428                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1429
1430                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1431                 if (i < 0) {
1432                         kfree(acm->country_codes);
1433                         acm->country_codes = NULL;
1434                         acm->country_code_size = 0;
1435                         goto skip_countries;
1436                 }
1437
1438                 i = device_create_file(&intf->dev,
1439                                                 &dev_attr_iCountryCodeRelDate);
1440                 if (i < 0) {
1441                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1442                         kfree(acm->country_codes);
1443                         acm->country_codes = NULL;
1444                         acm->country_code_size = 0;
1445                         goto skip_countries;
1446                 }
1447         }
1448
1449 skip_countries:
1450         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1451                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1452                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1453                          /* works around buggy devices */
1454                          epctrl->bInterval ? epctrl->bInterval : 16);
1455         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1456         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1457
1458         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1459
1460         acm->line.dwDTERate = cpu_to_le32(9600);
1461         acm->line.bDataBits = 8;
1462         acm_set_line(acm, &acm->line);
1463
1464         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1465         usb_set_intfdata(data_interface, acm);
1466
1467         usb_get_intf(control_interface);
1468         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1469                         &control_interface->dev);
1470         if (IS_ERR(tty_dev)) {
1471                 rv = PTR_ERR(tty_dev);
1472                 goto alloc_fail8;
1473         }
1474
1475         if (quirks & CLEAR_HALT_CONDITIONS) {
1476                 usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress));
1477                 usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress));
1478         }
1479
1480         return 0;
1481 alloc_fail8:
1482         if (acm->country_codes) {
1483                 device_remove_file(&acm->control->dev,
1484                                 &dev_attr_wCountryCodes);
1485                 device_remove_file(&acm->control->dev,
1486                                 &dev_attr_iCountryCodeRelDate);
1487                 kfree(acm->country_codes);
1488         }
1489         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1490 alloc_fail7:
1491         usb_set_intfdata(intf, NULL);
1492         for (i = 0; i < ACM_NW; i++)
1493                 usb_free_urb(acm->wb[i].urb);
1494 alloc_fail6:
1495         for (i = 0; i < num_rx_buf; i++)
1496                 usb_free_urb(acm->read_urbs[i]);
1497         acm_read_buffers_free(acm);
1498         usb_free_urb(acm->ctrlurb);
1499 alloc_fail5:
1500         acm_write_buffers_free(acm);
1501 alloc_fail4:
1502         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1503 alloc_fail2:
1504         acm_release_minor(acm);
1505         kfree(acm);
1506 alloc_fail:
1507         return rv;
1508 }
1509
1510 static void stop_data_traffic(struct acm *acm)
1511 {
1512         int i;
1513
1514         dev_dbg(&acm->control->dev, "%s\n", __func__);
1515
1516         usb_kill_urb(acm->ctrlurb);
1517         for (i = 0; i < ACM_NW; i++)
1518                 usb_kill_urb(acm->wb[i].urb);
1519         for (i = 0; i < acm->rx_buflimit; i++)
1520                 usb_kill_urb(acm->read_urbs[i]);
1521
1522         cancel_work_sync(&acm->work);
1523 }
1524
1525 static void acm_disconnect(struct usb_interface *intf)
1526 {
1527         struct acm *acm = usb_get_intfdata(intf);
1528         struct usb_device *usb_dev = interface_to_usbdev(intf);
1529         struct tty_struct *tty;
1530         int i;
1531
1532         dev_dbg(&intf->dev, "%s\n", __func__);
1533
1534         /* sibling interface is already cleaning up */
1535         if (!acm)
1536                 return;
1537
1538         mutex_lock(&acm->mutex);
1539         acm->disconnected = true;
1540         if (acm->country_codes) {
1541                 device_remove_file(&acm->control->dev,
1542                                 &dev_attr_wCountryCodes);
1543                 device_remove_file(&acm->control->dev,
1544                                 &dev_attr_iCountryCodeRelDate);
1545         }
1546         wake_up_all(&acm->wioctl);
1547         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1548         usb_set_intfdata(acm->control, NULL);
1549         usb_set_intfdata(acm->data, NULL);
1550         mutex_unlock(&acm->mutex);
1551
1552         tty = tty_port_tty_get(&acm->port);
1553         if (tty) {
1554                 tty_vhangup(tty);
1555                 tty_kref_put(tty);
1556         }
1557
1558         stop_data_traffic(acm);
1559
1560         tty_unregister_device(acm_tty_driver, acm->minor);
1561
1562         usb_free_urb(acm->ctrlurb);
1563         for (i = 0; i < ACM_NW; i++)
1564                 usb_free_urb(acm->wb[i].urb);
1565         for (i = 0; i < acm->rx_buflimit; i++)
1566                 usb_free_urb(acm->read_urbs[i]);
1567         acm_write_buffers_free(acm);
1568         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1569         acm_read_buffers_free(acm);
1570
1571         if (!acm->combined_interfaces)
1572                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1573                                         acm->data : acm->control);
1574
1575         tty_port_put(&acm->port);
1576 }
1577
1578 #ifdef CONFIG_PM
1579 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1580 {
1581         struct acm *acm = usb_get_intfdata(intf);
1582         int cnt;
1583
1584         spin_lock_irq(&acm->write_lock);
1585         if (PMSG_IS_AUTO(message)) {
1586                 if (acm->transmitting) {
1587                         spin_unlock_irq(&acm->write_lock);
1588                         return -EBUSY;
1589                 }
1590         }
1591         cnt = acm->susp_count++;
1592         spin_unlock_irq(&acm->write_lock);
1593
1594         if (cnt)
1595                 return 0;
1596
1597         stop_data_traffic(acm);
1598
1599         return 0;
1600 }
1601
1602 static int acm_resume(struct usb_interface *intf)
1603 {
1604         struct acm *acm = usb_get_intfdata(intf);
1605         struct urb *urb;
1606         int rv = 0;
1607
1608         spin_lock_irq(&acm->write_lock);
1609
1610         if (--acm->susp_count)
1611                 goto out;
1612
1613         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1614                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1615
1616                 for (;;) {
1617                         urb = usb_get_from_anchor(&acm->delayed);
1618                         if (!urb)
1619                                 break;
1620
1621                         acm_start_wb(acm, urb->context);
1622                 }
1623
1624                 /*
1625                  * delayed error checking because we must
1626                  * do the write path at all cost
1627                  */
1628                 if (rv < 0)
1629                         goto out;
1630
1631                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1632         }
1633 out:
1634         spin_unlock_irq(&acm->write_lock);
1635
1636         return rv;
1637 }
1638
1639 static int acm_reset_resume(struct usb_interface *intf)
1640 {
1641         struct acm *acm = usb_get_intfdata(intf);
1642
1643         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1644                 tty_port_tty_hangup(&acm->port, false);
1645
1646         return acm_resume(intf);
1647 }
1648
1649 #endif /* CONFIG_PM */
1650
1651 #define NOKIA_PCSUITE_ACM_INFO(x) \
1652                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1653                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1654                 USB_CDC_ACM_PROTO_VENDOR)
1655
1656 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1657                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1658                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1659                 USB_CDC_ACM_PROTO_VENDOR)
1660
1661 /*
1662  * USB driver structure.
1663  */
1664
1665 static const struct usb_device_id acm_ids[] = {
1666         /* quirky and broken devices */
1667         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1668         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1669         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1670         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1671         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1672         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1673         },
1674         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1675         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1676         },
1677         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1678         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1679         },
1680         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1681         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1682         },
1683         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1684         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1685         },
1686         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1687         .driver_info = SINGLE_RX_URB,
1688         },
1689         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1690         .driver_info = SINGLE_RX_URB, /* firmware bug */
1691         },
1692         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1693         .driver_info = SINGLE_RX_URB, /* firmware bug */
1694         },
1695         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1696         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1697         },
1698         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1699         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1700         },
1701         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1702         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1703         },
1704         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1705         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1706         },
1707         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1708         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1709         },
1710         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1711         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1712         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1713         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1714         },
1715         /* Motorola H24 HSPA module: */
1716         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1717         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1718         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1719         },
1720         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1721         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1722         },
1723         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1724         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1725         },
1726         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1727         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1728         },
1729         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1730         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1731         },
1732         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1733         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1734         },
1735         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1736         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1737         },
1738
1739         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1740         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1741                                            data interface instead of
1742                                            communications interface.
1743                                            Maybe we should define a new
1744                                            quirk for this. */
1745         },
1746         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1747         .driver_info = NO_UNION_NORMAL,
1748         },
1749         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1750         .driver_info = NO_UNION_NORMAL,
1751         },
1752         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1753         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1754         },
1755         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1756         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1757         },
1758
1759         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1760         .driver_info = CLEAR_HALT_CONDITIONS,
1761         },
1762
1763         /* Nokia S60 phones expose two ACM channels. The first is
1764          * a modem and is picked up by the standard AT-command
1765          * information below. The second is 'vendor-specific' but
1766          * is treated as a serial device at the S60 end, so we want
1767          * to expose it on Linux too. */
1768         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1769         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1770         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1771         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1772         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1773         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1774         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1775         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1776         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1777         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1778         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1779         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1780         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1781         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1782         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1783         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1784         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1785         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1786         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1787         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1788         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1789         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1790         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1791         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1792         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1793         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1794         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1795         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1796         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1797         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1798         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1799         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1800         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1801         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1802         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1803         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1804         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1805         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1806         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1807         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1808         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1809         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1810         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1811         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1812         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1813         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1814         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1815         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1816         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1817         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1818         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1819         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1820         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1821         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1822         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1823         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1824         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1825         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1826
1827         /* Support for Owen devices */
1828         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1829
1830         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1831
1832         /* Support for Droids MuIn LCD */
1833         { USB_DEVICE(0x04d8, 0x000b),
1834         .driver_info = NO_DATA_INTERFACE,
1835         },
1836
1837 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1838         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1839         .driver_info = IGNORE_DEVICE,
1840         },
1841         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1842         .driver_info = IGNORE_DEVICE,
1843         },
1844 #endif
1845
1846         /*Samsung phone in firmware update mode */
1847         { USB_DEVICE(0x04e8, 0x685d),
1848         .driver_info = IGNORE_DEVICE,
1849         },
1850
1851         /* Exclude Infineon Flash Loader utility */
1852         { USB_DEVICE(0x058b, 0x0041),
1853         .driver_info = IGNORE_DEVICE,
1854         },
1855
1856         /* control interfaces without any protocol set */
1857         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1858                 USB_CDC_PROTO_NONE) },
1859
1860         /* control interfaces with various AT-command sets */
1861         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1862                 USB_CDC_ACM_PROTO_AT_V25TER) },
1863         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1864                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1865         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1866                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1867         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1868                 USB_CDC_ACM_PROTO_AT_GSM) },
1869         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1870                 USB_CDC_ACM_PROTO_AT_3G) },
1871         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1872                 USB_CDC_ACM_PROTO_AT_CDMA) },
1873
1874         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1875         .driver_info = SEND_ZERO_PACKET,
1876         },
1877
1878         { }
1879 };
1880
1881 MODULE_DEVICE_TABLE(usb, acm_ids);
1882
1883 static struct usb_driver acm_driver = {
1884         .name =         "cdc_acm",
1885         .probe =        acm_probe,
1886         .disconnect =   acm_disconnect,
1887 #ifdef CONFIG_PM
1888         .suspend =      acm_suspend,
1889         .resume =       acm_resume,
1890         .reset_resume = acm_reset_resume,
1891 #endif
1892         .id_table =     acm_ids,
1893 #ifdef CONFIG_PM
1894         .supports_autosuspend = 1,
1895 #endif
1896         .disable_hub_initiated_lpm = 1,
1897 };
1898
1899 /*
1900  * TTY driver structures.
1901  */
1902
1903 static const struct tty_operations acm_ops = {
1904         .install =              acm_tty_install,
1905         .open =                 acm_tty_open,
1906         .close =                acm_tty_close,
1907         .cleanup =              acm_tty_cleanup,
1908         .hangup =               acm_tty_hangup,
1909         .write =                acm_tty_write,
1910         .write_room =           acm_tty_write_room,
1911         .ioctl =                acm_tty_ioctl,
1912         .throttle =             acm_tty_throttle,
1913         .unthrottle =           acm_tty_unthrottle,
1914         .chars_in_buffer =      acm_tty_chars_in_buffer,
1915         .break_ctl =            acm_tty_break_ctl,
1916         .set_termios =          acm_tty_set_termios,
1917         .tiocmget =             acm_tty_tiocmget,
1918         .tiocmset =             acm_tty_tiocmset,
1919 };
1920
1921 /*
1922  * Init / exit.
1923  */
1924
1925 static int __init acm_init(void)
1926 {
1927         int retval;
1928         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1929         if (!acm_tty_driver)
1930                 return -ENOMEM;
1931         acm_tty_driver->driver_name = "acm",
1932         acm_tty_driver->name = "ttyACM",
1933         acm_tty_driver->major = ACM_TTY_MAJOR,
1934         acm_tty_driver->minor_start = 0,
1935         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1936         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1937         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1938         acm_tty_driver->init_termios = tty_std_termios;
1939         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1940                                                                 HUPCL | CLOCAL;
1941         tty_set_operations(acm_tty_driver, &acm_ops);
1942
1943         retval = tty_register_driver(acm_tty_driver);
1944         if (retval) {
1945                 put_tty_driver(acm_tty_driver);
1946                 return retval;
1947         }
1948
1949         retval = usb_register(&acm_driver);
1950         if (retval) {
1951                 tty_unregister_driver(acm_tty_driver);
1952                 put_tty_driver(acm_tty_driver);
1953                 return retval;
1954         }
1955
1956         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1957
1958         return 0;
1959 }
1960
1961 static void __exit acm_exit(void)
1962 {
1963         usb_deregister(&acm_driver);
1964         tty_unregister_driver(acm_tty_driver);
1965         put_tty_driver(acm_tty_driver);
1966         idr_destroy(&acm_minors);
1967 }
1968
1969 module_init(acm_init);
1970 module_exit(acm_exit);
1971
1972 MODULE_AUTHOR(DRIVER_AUTHOR);
1973 MODULE_DESCRIPTION(DRIVER_DESC);
1974 MODULE_LICENSE("GPL");
1975 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);