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