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