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