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                 if (acm->putbuffer) {
 717                         /* now to preserve order */
 718                         usb_anchor_urb(acm->putbuffer->urb, &acm->delayed);
 719                         acm->putbuffer = NULL;
 720                 }
 721                 usb_anchor_urb(wb->urb, &acm->delayed);
 722                 spin_unlock_irqrestore(&acm->write_lock, flags);
 723                 return count;
 724         } else {
 725                 if (acm->putbuffer) {
 726                         /* at this point there is no good way to handle errors */
 727                         acm_start_wb(acm, acm->putbuffer);
 728                         acm->putbuffer = NULL;
 729                 }
 730         }
 731
 732         stat = acm_start_wb(acm, wb);
 733         spin_unlock_irqrestore(&acm->write_lock, flags);
 734
 735         if (stat < 0)
 736                 return stat;
 737         return count;
 738 }
 739
 740 static void acm_tty_flush_chars(struct tty_struct *tty)
 741 {
 742         struct acm *acm = tty->driver_data;
 743         struct acm_wb *cur = acm->putbuffer;
 744         int err;
 745         unsigned long flags;
 746
 747         acm->putbuffer = NULL;
 748         err = usb_autopm_get_interface_async(acm->control);
 749         spin_lock_irqsave(&acm->write_lock, flags);
 750         if (err < 0) {
 751                 cur->use = 0;
 752                 goto out;
 753         }
 754
 755         if (acm->susp_count)
 756                 usb_anchor_urb(cur->urb, &acm->delayed);
 757         else
 758                 acm_start_wb(acm, cur);
 759 out:
 760         spin_unlock_irqrestore(&acm->write_lock, flags);
 761         return;
 762 }
 763
 764 static int acm_tty_put_char(struct tty_struct *tty, unsigned char ch)
 765 {
 766         struct acm *acm = tty->driver_data;
 767         struct acm_wb *cur;
 768         int wbn;
 769         unsigned long flags;
 770
 771 overflow:
 772         cur = acm->putbuffer;
 773         if (!cur) {
 774                 spin_lock_irqsave(&acm->write_lock, flags);
 775                 wbn = acm_wb_alloc(acm);
 776                 if (wbn >= 0) {
 777                         cur = &acm->wb[wbn];
 778                         acm->putbuffer = cur;
 779                 }
 780                 spin_unlock_irqrestore(&acm->write_lock, flags);
 781                 if (!cur)
 782                         return 0;
 783         }
 784
 785         if (cur->len == acm->writesize) {
 786                 acm_tty_flush_chars(tty);
 787                 goto overflow;
 788         }
 789
 790         cur->buf[cur->len++] = ch;
 791         return 1;
 792 }
 793
 794 static int acm_tty_write_room(struct tty_struct *tty)
 795 {
 796         struct acm *acm = tty->driver_data;
 797         /*
 798          * Do not let the line discipline to know that we have a reserve,
 799          * or it might get too enthusiastic.
 800          */
 801         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 802 }
 803
 804 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 805 {
 806         struct acm *acm = tty->driver_data;
 807         /*
 808          * if the device was unplugged then any remaining characters fell out
 809          * of the connector ;)
 810          */
 811         if (acm->disconnected)
 812                 return 0;
 813         /*
 814          * This is inaccurate (overcounts), but it works.
 815          */
 816         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 817 }
 818
 819 static void acm_tty_throttle(struct tty_struct *tty)
 820 {
 821         struct acm *acm = tty->driver_data;
 822
 823         spin_lock_irq(&acm->read_lock);
 824         acm->throttle_req = 1;
 825         spin_unlock_irq(&acm->read_lock);
 826 }
 827
 828 static void acm_tty_unthrottle(struct tty_struct *tty)
 829 {
 830         struct acm *acm = tty->driver_data;
 831         unsigned int was_throttled;
 832
 833         spin_lock_irq(&acm->read_lock);
 834         was_throttled = acm->throttled;
 835         acm->throttled = 0;
 836         acm->throttle_req = 0;
 837         spin_unlock_irq(&acm->read_lock);
 838
 839         if (was_throttled)
 840                 acm_submit_read_urbs(acm, GFP_KERNEL);
 841 }
 842
 843 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 844 {
 845         struct acm *acm = tty->driver_data;
 846         int retval;
 847
 848         retval = acm_send_break(acm, state ? 0xffff : 0);
 849         if (retval < 0)
 850                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 851                                                                 __func__);
 852         return retval;
 853 }
 854
 855 static int acm_tty_tiocmget(struct tty_struct *tty)
 856 {
 857         struct acm *acm = tty->driver_data;
 858
 859         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 860                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 861                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 862                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 863                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 864                TIOCM_CTS;
 865 }
 866
 867 static int acm_tty_tiocmset(struct tty_struct *tty,
 868                             unsigned int set, unsigned int clear)
 869 {
 870         struct acm *acm = tty->driver_data;
 871         unsigned int newctrl;
 872
 873         newctrl = acm->ctrlout;
 874         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 875                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 876         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 877                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 878
 879         newctrl = (newctrl & ~clear) | set;
 880
 881         if (acm->ctrlout == newctrl)
 882                 return 0;
 883         return acm_set_control(acm, acm->ctrlout = newctrl);
 884 }
 885
 886 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 887 {
 888         struct serial_struct tmp;
 889
 890         if (!info)
 891                 return -EINVAL;
 892
 893         memset(&tmp, 0, sizeof(tmp));
 894         tmp.flags = ASYNC_LOW_LATENCY;
 895         tmp.xmit_fifo_size = acm->writesize;
 896         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 897         tmp.close_delay = acm->port.close_delay / 10;
 898         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 899                                 ASYNC_CLOSING_WAIT_NONE :
 900                                 acm->port.closing_wait / 10;
 901
 902         if (copy_to_user(info, &tmp, sizeof(tmp)))
 903                 return -EFAULT;
 904         else
 905                 return 0;
 906 }
 907
 908 static int set_serial_info(struct acm *acm,
 909                                 struct serial_struct __user *newinfo)
 910 {
 911         struct serial_struct new_serial;
 912         unsigned int closing_wait, close_delay;
 913         int retval = 0;
 914
 915         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 916                 return -EFAULT;
 917
 918         close_delay = new_serial.close_delay * 10;
 919         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 920                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 921
 922         mutex_lock(&acm->port.mutex);
 923
 924         if (!capable(CAP_SYS_ADMIN)) {
 925                 if ((close_delay != acm->port.close_delay) ||
 926                     (closing_wait != acm->port.closing_wait))
 927                         retval = -EPERM;
 928                 else
 929                         retval = -EOPNOTSUPP;
 930         } else {
 931                 acm->port.close_delay  = close_delay;
 932                 acm->port.closing_wait = closing_wait;
 933         }
 934
 935         mutex_unlock(&acm->port.mutex);
 936         return retval;
 937 }
 938
 939 static int wait_serial_change(struct acm *acm, unsigned long arg)
 940 {
 941         int rv = 0;
 942         DECLARE_WAITQUEUE(wait, current);
 943         struct async_icount old, new;
 944
 945         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
 946                 return -EINVAL;
 947         do {
 948                 spin_lock_irq(&acm->read_lock);
 949                 old = acm->oldcount;
 950                 new = acm->iocount;
 951                 acm->oldcount = new;
 952                 spin_unlock_irq(&acm->read_lock);
 953
 954                 if ((arg & TIOCM_DSR) &&
 955                         old.dsr != new.dsr)
 956                         break;
 957                 if ((arg & TIOCM_CD)  &&
 958                         old.dcd != new.dcd)
 959                         break;
 960                 if ((arg & TIOCM_RI) &&
 961                         old.rng != new.rng)
 962                         break;
 963
 964                 add_wait_queue(&acm->wioctl, &wait);
 965                 set_current_state(TASK_INTERRUPTIBLE);
 966                 schedule();
 967                 remove_wait_queue(&acm->wioctl, &wait);
 968                 if (acm->disconnected) {
 969                         if (arg & TIOCM_CD)
 970                                 break;
 971                         else
 972                                 rv = -ENODEV;
 973                 } else {
 974                         if (signal_pending(current))
 975                                 rv = -ERESTARTSYS;
 976                 }
 977         } while (!rv);
 978
 979
 980
 981         return rv;
 982 }
 983
 984 static int get_serial_usage(struct acm *acm,
 985                             struct serial_icounter_struct __user *count)
 986 {
 987         struct serial_icounter_struct icount;
 988         int rv = 0;
 989
 990         memset(&icount, 0, sizeof(icount));
 991         icount.dsr = acm->iocount.dsr;
 992         icount.rng = acm->iocount.rng;
 993         icount.dcd = acm->iocount.dcd;
 994         icount.frame = acm->iocount.frame;
 995         icount.overrun = acm->iocount.overrun;
 996         icount.parity = acm->iocount.parity;
 997         icount.brk = acm->iocount.brk;
 998
 999         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
1000                 rv = -EFAULT;
1001
1002         return rv;
1003 }
1004
1005 static int acm_tty_ioctl(struct tty_struct *tty,
1006                                         unsigned int cmd, unsigned long arg)
1007 {
1008         struct acm *acm = tty->driver_data;
1009         int rv = -ENOIOCTLCMD;
1010
1011         switch (cmd) {
1012         case TIOCGSERIAL: /* gets serial port data */
1013                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
1014                 break;
1015         case TIOCSSERIAL:
1016                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
1017                 break;
1018         case TIOCMIWAIT:
1019                 rv = usb_autopm_get_interface(acm->control);
1020                 if (rv < 0) {
1021                         rv = -EIO;
1022                         break;
1023                 }
1024                 rv = wait_serial_change(acm, arg);
1025                 usb_autopm_put_interface(acm->control);
1026                 break;
1027         case TIOCGICOUNT:
1028                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
1029                 break;
1030         }
1031
1032         return rv;
1033 }
1034
1035 static void acm_tty_set_termios(struct tty_struct *tty,
1036                                                 struct ktermios *termios_old)
1037 {
1038         struct acm *acm = tty->driver_data;
1039         struct ktermios *termios = &tty->termios;
1040         struct usb_cdc_line_coding newline;
1041         int newctrl = acm->ctrlout;
1042
1043         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1044         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1045         newline.bParityType = termios->c_cflag & PARENB ?
1046                                 (termios->c_cflag & PARODD ? 1 : 2) +
1047                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1048         switch (termios->c_cflag & CSIZE) {
1049         case CS5:
1050                 newline.bDataBits = 5;
1051                 break;
1052         case CS6:
1053                 newline.bDataBits = 6;
1054                 break;
1055         case CS7:
1056                 newline.bDataBits = 7;
1057                 break;
1058         case CS8:
1059         default:
1060                 newline.bDataBits = 8;
1061                 break;
1062         }
1063         /* FIXME: Needs to clear unsupported bits in the termios */
1064         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1065
1066         if (C_BAUD(tty) == B0) {
1067                 newline.dwDTERate = acm->line.dwDTERate;
1068                 newctrl &= ~ACM_CTRL_DTR;
1069         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1070                 newctrl |=  ACM_CTRL_DTR;
1071         }
1072
1073         if (newctrl != acm->ctrlout)
1074                 acm_set_control(acm, acm->ctrlout = newctrl);
1075
1076         if (memcmp(&acm->line, &newline, sizeof newline)) {
1077                 memcpy(&acm->line, &newline, sizeof newline);
1078                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1079                         __func__,
1080                         le32_to_cpu(newline.dwDTERate),
1081                         newline.bCharFormat, newline.bParityType,
1082                         newline.bDataBits);
1083                 acm_set_line(acm, &acm->line);
1084         }
1085 }
1086
1087 static const struct tty_port_operations acm_port_ops = {
1088         .dtr_rts = acm_port_dtr_rts,
1089         .shutdown = acm_port_shutdown,
1090         .activate = acm_port_activate,
1091         .destruct = acm_port_destruct,
1092 };
1093
1094 /*
1095  * USB probe and disconnect routines.
1096  */
1097
1098 /* Little helpers: write/read buffers free */
1099 static void acm_write_buffers_free(struct acm *acm)
1100 {
1101         int i;
1102         struct acm_wb *wb;
1103         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1104
1105         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1106                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1107 }
1108
1109 static void acm_read_buffers_free(struct acm *acm)
1110 {
1111         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1112         int i;
1113
1114         for (i = 0; i < acm->rx_buflimit; i++)
1115                 usb_free_coherent(usb_dev, acm->readsize,
1116                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1117 }
1118
1119 /* Little helper: write buffers allocate */
1120 static int acm_write_buffers_alloc(struct acm *acm)
1121 {
1122         int i;
1123         struct acm_wb *wb;
1124
1125         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1126                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1127                     &wb->dmah);
1128                 if (!wb->buf) {
1129                         while (i != 0) {
1130                                 --i;
1131                                 --wb;
1132                                 usb_free_coherent(acm->dev, acm->writesize,
1133                                     wb->buf, wb->dmah);
1134                         }
1135                         return -ENOMEM;
1136                 }
1137         }
1138         return 0;
1139 }
1140
1141 static int acm_probe(struct usb_interface *intf,
1142                      const struct usb_device_id *id)
1143 {
1144         struct usb_cdc_union_desc *union_header = NULL;
1145         struct usb_cdc_country_functional_desc *cfd = NULL;
1146         unsigned char *buffer = intf->altsetting->extra;
1147         int buflen = intf->altsetting->extralen;
1148         struct usb_interface *control_interface;
1149         struct usb_interface *data_interface;
1150         struct usb_endpoint_descriptor *epctrl = NULL;
1151         struct usb_endpoint_descriptor *epread = NULL;
1152         struct usb_endpoint_descriptor *epwrite = NULL;
1153         struct usb_device *usb_dev = interface_to_usbdev(intf);
1154         struct acm *acm;
1155         int minor;
1156         int ctrlsize, readsize;
1157         u8 *buf;
1158         u8 ac_management_function = 0;
1159         u8 call_management_function = 0;
1160         int call_interface_num = -1;
1161         int data_interface_num = -1;
1162         unsigned long quirks;
1163         int num_rx_buf;
1164         int i;
1165         unsigned int elength = 0;
1166         int combined_interfaces = 0;
1167         struct device *tty_dev;
1168         int rv = -ENOMEM;
1169
1170         /* normal quirks */
1171         quirks = (unsigned long)id->driver_info;
1172
1173         if (quirks == IGNORE_DEVICE)
1174                 return -ENODEV;
1175
1176         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1177
1178         /* handle quirks deadly to normal probing*/
1179         if (quirks == NO_UNION_NORMAL) {
1180                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1181                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1182                 /* we would crash */
1183                 if (!data_interface || !control_interface)
1184                         return -ENODEV;
1185                 goto skip_normal_probe;
1186         }
1187
1188         /* normal probing*/
1189         if (!buffer) {
1190                 dev_err(&intf->dev, "Weird descriptor references\n");
1191                 return -EINVAL;
1192         }
1193
1194         if (!buflen) {
1195                 if (intf->cur_altsetting->endpoint &&
1196                                 intf->cur_altsetting->endpoint->extralen &&
1197                                 intf->cur_altsetting->endpoint->extra) {
1198                         dev_dbg(&intf->dev,
1199                                 "Seeking extra descriptors on endpoint\n");
1200                         buflen = intf->cur_altsetting->endpoint->extralen;
1201                         buffer = intf->cur_altsetting->endpoint->extra;
1202                 } else {
1203                         dev_err(&intf->dev,
1204                                 "Zero length descriptor references\n");
1205                         return -EINVAL;
1206                 }
1207         }
1208
1209         while (buflen > 0) {
1210                 elength = buffer[0];
1211                 if (!elength) {
1212                         dev_err(&intf->dev, "skipping garbage byte\n");
1213                         elength = 1;
1214                         goto next_desc;
1215                 }
1216                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1217                         dev_err(&intf->dev, "skipping garbage\n");
1218                         goto next_desc;
1219                 }
1220
1221                 switch (buffer[2]) {
1222                 case USB_CDC_UNION_TYPE: /* we've found it */
1223                         if (elength < sizeof(struct usb_cdc_union_desc))
1224                                 goto next_desc;
1225                         if (union_header) {
1226                                 dev_err(&intf->dev, "More than one "
1227                                         "union descriptor, skipping ...\n");
1228                                 goto next_desc;
1229                         }
1230                         union_header = (struct usb_cdc_union_desc *)buffer;
1231                         break;
1232                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1233                         if (elength < sizeof(struct usb_cdc_country_functional_desc))
1234                                 goto next_desc;
1235                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1236                         break;
1237                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1238                         break; /* for now we ignore it */
1239                 case USB_CDC_ACM_TYPE:
1240                         if (elength < 4)
1241                                 goto next_desc;
1242                         ac_management_function = buffer[3];
1243                         break;
1244                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1245                         if (elength < 5)
1246                                 goto next_desc;
1247                         call_management_function = buffer[3];
1248                         call_interface_num = buffer[4];
1249                         break;
1250                 default:
1251                         /*
1252                          * there are LOTS more CDC descriptors that
1253                          * could legitimately be found here.
1254                          */
1255                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1256                                         "type %02x, length %ud\n",
1257                                         buffer[2], elength);
1258                         break;
1259                 }
1260 next_desc:
1261                 buflen -= elength;
1262                 buffer += elength;
1263         }
1264
1265         if (!union_header) {
1266                 if (call_interface_num > 0) {
1267                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1268                         /* quirks for Droids MuIn LCD */
1269                         if (quirks & NO_DATA_INTERFACE)
1270                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1271                         else
1272                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1273                         control_interface = intf;
1274                 } else {
1275                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1276                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1277                                 return -ENODEV;
1278                         } else {
1279                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1280                                 combined_interfaces = 1;
1281                                 control_interface = data_interface = intf;
1282                                 goto look_for_collapsed_interface;
1283                         }
1284                 }
1285         } else {
1286                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1287                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1288         }
1289
1290         if (!control_interface || !data_interface) {
1291                 dev_dbg(&intf->dev, "no interfaces\n");
1292                 return -ENODEV;
1293         }
1294
1295         if (data_interface_num != call_interface_num)
1296                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1297
1298         if (control_interface == data_interface) {
1299                 /* some broken devices designed for windows work this way */
1300                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1301                 combined_interfaces = 1;
1302                 /* a popular other OS doesn't use it */
1303                 quirks |= NO_CAP_LINE;
1304                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1305                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1306                         return -EINVAL;
1307                 }
1308 look_for_collapsed_interface:
1309                 for (i = 0; i < 3; i++) {
1310                         struct usb_endpoint_descriptor *ep;
1311                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1312
1313                         if (usb_endpoint_is_int_in(ep))
1314                                 epctrl = ep;
1315                         else if (usb_endpoint_is_bulk_out(ep))
1316                                 epwrite = ep;
1317                         else if (usb_endpoint_is_bulk_in(ep))
1318                                 epread = ep;
1319                         else
1320                                 return -EINVAL;
1321                 }
1322                 if (!epctrl || !epread || !epwrite)
1323                         return -ENODEV;
1324                 else
1325                         goto made_compressed_probe;
1326         }
1327
1328 skip_normal_probe:
1329
1330         /*workaround for switched interfaces */
1331         if (data_interface->cur_altsetting->desc.bInterfaceClass
1332                                                 != CDC_DATA_INTERFACE_TYPE) {
1333                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1334                                                 == CDC_DATA_INTERFACE_TYPE) {
1335                         dev_dbg(&intf->dev,
1336                                 "Your device has switched interfaces.\n");
1337                         swap(control_interface, data_interface);
1338                 } else {
1339                         return -EINVAL;
1340                 }
1341         }
1342
1343         /* Accept probe requests only for the control interface */
1344         if (!combined_interfaces && intf != control_interface)
1345                 return -ENODEV;
1346
1347         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1348                 /* valid in this context */
1349                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1350                 return -EBUSY;
1351         }
1352
1353
1354         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1355             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1356                 return -EINVAL;
1357
1358         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1359         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1360         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1361
1362
1363         /* workaround for switched endpoints */
1364         if (!usb_endpoint_dir_in(epread)) {
1365                 /* descriptors are swapped */
1366                 dev_dbg(&intf->dev,
1367                         "The data interface has switched endpoints\n");
1368                 swap(epread, epwrite);
1369         }
1370 made_compressed_probe:
1371         dev_dbg(&intf->dev, "interfaces are valid\n");
1372
1373         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1374         if (acm == NULL)
1375                 goto alloc_fail;
1376
1377         minor = acm_alloc_minor(acm);
1378         if (minor < 0) {
1379                 dev_err(&intf->dev, "no more free acm devices\n");
1380                 kfree(acm);
1381                 return -ENODEV;
1382         }
1383
1384         ctrlsize = usb_endpoint_maxp(epctrl);
1385         readsize = usb_endpoint_maxp(epread) *
1386                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1387         acm->combined_interfaces = combined_interfaces;
1388         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1389         acm->control = control_interface;
1390         acm->data = data_interface;
1391         acm->minor = minor;
1392         acm->dev = usb_dev;
1393         acm->ctrl_caps = ac_management_function;
1394         if (quirks & NO_CAP_LINE)
1395                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1396         acm->ctrlsize = ctrlsize;
1397         acm->readsize = readsize;
1398         acm->rx_buflimit = num_rx_buf;
1399         INIT_WORK(&acm->work, acm_softint);
1400         init_waitqueue_head(&acm->wioctl);
1401         spin_lock_init(&acm->write_lock);
1402         spin_lock_init(&acm->read_lock);
1403         mutex_init(&acm->mutex);
1404         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1405         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1406         if (acm->is_int_ep)
1407                 acm->bInterval = epread->bInterval;
1408         tty_port_init(&acm->port);
1409         acm->port.ops = &acm_port_ops;
1410         init_usb_anchor(&acm->delayed);
1411         acm->quirks = quirks;
1412
1413         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1414         if (!buf)
1415                 goto alloc_fail2;
1416         acm->ctrl_buffer = buf;
1417
1418         if (acm_write_buffers_alloc(acm) < 0)
1419                 goto alloc_fail4;
1420
1421         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1422         if (!acm->ctrlurb)
1423                 goto alloc_fail5;
1424
1425         for (i = 0; i < num_rx_buf; i++) {
1426                 struct acm_rb *rb = &(acm->read_buffers[i]);
1427                 struct urb *urb;
1428
1429                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1430                                                                 &rb->dma);
1431                 if (!rb->base)
1432                         goto alloc_fail6;
1433                 rb->index = i;
1434                 rb->instance = acm;
1435
1436                 urb = usb_alloc_urb(0, GFP_KERNEL);
1437                 if (!urb)
1438                         goto alloc_fail6;
1439
1440                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1441                 urb->transfer_dma = rb->dma;
1442                 if (acm->is_int_ep) {
1443                         usb_fill_int_urb(urb, acm->dev,
1444                                          acm->rx_endpoint,
1445                                          rb->base,
1446                                          acm->readsize,
1447                                          acm_read_bulk_callback, rb,
1448                                          acm->bInterval);
1449                 } else {
1450                         usb_fill_bulk_urb(urb, acm->dev,
1451                                           acm->rx_endpoint,
1452                                           rb->base,
1453                                           acm->readsize,
1454                                           acm_read_bulk_callback, rb);
1455                 }
1456
1457                 acm->read_urbs[i] = urb;
1458                 __set_bit(i, &acm->read_urbs_free);
1459         }
1460         for (i = 0; i < ACM_NW; i++) {
1461                 struct acm_wb *snd = &(acm->wb[i]);
1462
1463                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1464                 if (snd->urb == NULL)
1465                         goto alloc_fail7;
1466
1467                 if (usb_endpoint_xfer_int(epwrite))
1468                         usb_fill_int_urb(snd->urb, usb_dev,
1469                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1470                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1471                 else
1472                         usb_fill_bulk_urb(snd->urb, usb_dev,
1473                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1474                                 NULL, acm->writesize, acm_write_bulk, snd);
1475                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1476                 if (quirks & SEND_ZERO_PACKET)
1477                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1478                 snd->instance = acm;
1479         }
1480
1481         usb_set_intfdata(intf, acm);
1482
1483         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1484         if (i < 0)
1485                 goto alloc_fail7;
1486
1487         if (cfd) { /* export the country data */
1488                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1489                 if (!acm->country_codes)
1490                         goto skip_countries;
1491                 acm->country_code_size = cfd->bLength - 4;
1492                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1493                                                         cfd->bLength - 4);
1494                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1495
1496                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1497                 if (i < 0) {
1498                         kfree(acm->country_codes);
1499                         acm->country_codes = NULL;
1500                         acm->country_code_size = 0;
1501                         goto skip_countries;
1502                 }
1503
1504                 i = device_create_file(&intf->dev,
1505                                                 &dev_attr_iCountryCodeRelDate);
1506                 if (i < 0) {
1507                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1508                         kfree(acm->country_codes);
1509                         acm->country_codes = NULL;
1510                         acm->country_code_size = 0;
1511                         goto skip_countries;
1512                 }
1513         }
1514
1515 skip_countries:
1516         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1517                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1518                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1519                          /* works around buggy devices */
1520                          epctrl->bInterval ? epctrl->bInterval : 16);
1521         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1522         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1523
1524         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1525
1526         acm->line.dwDTERate = cpu_to_le32(9600);
1527         acm->line.bDataBits = 8;
1528         acm_set_line(acm, &acm->line);
1529
1530         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1531         usb_set_intfdata(data_interface, acm);
1532
1533         usb_get_intf(control_interface);
1534         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1535                         &control_interface->dev);
1536         if (IS_ERR(tty_dev)) {
1537                 rv = PTR_ERR(tty_dev);
1538                 goto alloc_fail8;
1539         }
1540
1541         if (quirks & CLEAR_HALT_CONDITIONS) {
1542                 usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress));
1543                 usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress));
1544         }
1545
1546         return 0;
1547 alloc_fail8:
1548         if (acm->country_codes) {
1549                 device_remove_file(&acm->control->dev,
1550                                 &dev_attr_wCountryCodes);
1551                 device_remove_file(&acm->control->dev,
1552                                 &dev_attr_iCountryCodeRelDate);
1553                 kfree(acm->country_codes);
1554         }
1555         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1556 alloc_fail7:
1557         usb_set_intfdata(intf, NULL);
1558         for (i = 0; i < ACM_NW; i++)
1559                 usb_free_urb(acm->wb[i].urb);
1560 alloc_fail6:
1561         for (i = 0; i < num_rx_buf; i++)
1562                 usb_free_urb(acm->read_urbs[i]);
1563         acm_read_buffers_free(acm);
1564         usb_free_urb(acm->ctrlurb);
1565 alloc_fail5:
1566         acm_write_buffers_free(acm);
1567 alloc_fail4:
1568         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1569 alloc_fail2:
1570         acm_release_minor(acm);
1571         kfree(acm);
1572 alloc_fail:
1573         return rv;
1574 }
1575
1576 static void stop_data_traffic(struct acm *acm)
1577 {
1578         int i;
1579
1580         dev_dbg(&acm->control->dev, "%s\n", __func__);
1581
1582         usb_kill_urb(acm->ctrlurb);
1583         for (i = 0; i < ACM_NW; i++)
1584                 usb_kill_urb(acm->wb[i].urb);
1585         for (i = 0; i < acm->rx_buflimit; i++)
1586                 usb_kill_urb(acm->read_urbs[i]);
1587
1588         cancel_work_sync(&acm->work);
1589 }
1590
1591 static void acm_disconnect(struct usb_interface *intf)
1592 {
1593         struct acm *acm = usb_get_intfdata(intf);
1594         struct usb_device *usb_dev = interface_to_usbdev(intf);
1595         struct tty_struct *tty;
1596         int i;
1597
1598         dev_dbg(&intf->dev, "%s\n", __func__);
1599
1600         /* sibling interface is already cleaning up */
1601         if (!acm)
1602                 return;
1603
1604         mutex_lock(&acm->mutex);
1605         acm->disconnected = true;
1606         if (acm->country_codes) {
1607                 device_remove_file(&acm->control->dev,
1608                                 &dev_attr_wCountryCodes);
1609                 device_remove_file(&acm->control->dev,
1610                                 &dev_attr_iCountryCodeRelDate);
1611         }
1612         wake_up_all(&acm->wioctl);
1613         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1614         usb_set_intfdata(acm->control, NULL);
1615         usb_set_intfdata(acm->data, NULL);
1616         mutex_unlock(&acm->mutex);
1617
1618         tty = tty_port_tty_get(&acm->port);
1619         if (tty) {
1620                 tty_vhangup(tty);
1621                 tty_kref_put(tty);
1622         }
1623
1624         stop_data_traffic(acm);
1625
1626         tty_unregister_device(acm_tty_driver, acm->minor);
1627
1628         usb_free_urb(acm->ctrlurb);
1629         for (i = 0; i < ACM_NW; i++)
1630                 usb_free_urb(acm->wb[i].urb);
1631         for (i = 0; i < acm->rx_buflimit; i++)
1632                 usb_free_urb(acm->read_urbs[i]);
1633         acm_write_buffers_free(acm);
1634         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1635         acm_read_buffers_free(acm);
1636
1637         if (!acm->combined_interfaces)
1638                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1639                                         acm->data : acm->control);
1640
1641         tty_port_put(&acm->port);
1642 }
1643
1644 #ifdef CONFIG_PM
1645 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1646 {
1647         struct acm *acm = usb_get_intfdata(intf);
1648         int cnt;
1649
1650         spin_lock_irq(&acm->write_lock);
1651         if (PMSG_IS_AUTO(message)) {
1652                 if (acm->transmitting) {
1653                         spin_unlock_irq(&acm->write_lock);
1654                         return -EBUSY;
1655                 }
1656         }
1657         cnt = acm->susp_count++;
1658         spin_unlock_irq(&acm->write_lock);
1659
1660         if (cnt)
1661                 return 0;
1662
1663         stop_data_traffic(acm);
1664
1665         return 0;
1666 }
1667
1668 static int acm_resume(struct usb_interface *intf)
1669 {
1670         struct acm *acm = usb_get_intfdata(intf);
1671         struct urb *urb;
1672         int rv = 0;
1673
1674         spin_lock_irq(&acm->write_lock);
1675
1676         if (--acm->susp_count)
1677                 goto out;
1678
1679         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1680                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1681
1682                 for (;;) {
1683                         urb = usb_get_from_anchor(&acm->delayed);
1684                         if (!urb)
1685                                 break;
1686
1687                         acm_start_wb(acm, urb->context);
1688                 }
1689
1690                 /*
1691                  * delayed error checking because we must
1692                  * do the write path at all cost
1693                  */
1694                 if (rv < 0)
1695                         goto out;
1696
1697                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1698         }
1699 out:
1700         spin_unlock_irq(&acm->write_lock);
1701
1702         return rv;
1703 }
1704
1705 static int acm_reset_resume(struct usb_interface *intf)
1706 {
1707         struct acm *acm = usb_get_intfdata(intf);
1708
1709         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1710                 tty_port_tty_hangup(&acm->port, false);
1711
1712         return acm_resume(intf);
1713 }
1714
1715 #endif /* CONFIG_PM */
1716
1717 #define NOKIA_PCSUITE_ACM_INFO(x) \
1718                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1719                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1720                 USB_CDC_ACM_PROTO_VENDOR)
1721
1722 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1723                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1724                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1725                 USB_CDC_ACM_PROTO_VENDOR)
1726
1727 /*
1728  * USB driver structure.
1729  */
1730
1731 static const struct usb_device_id acm_ids[] = {
1732         /* quirky and broken devices */
1733         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1734         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1735         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1736         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1737         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1738         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1739         },
1740         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1741         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1742         },
1743         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1744         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1745         },
1746         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1747         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1748         },
1749         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1750         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1751         },
1752         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1753         .driver_info = SINGLE_RX_URB,
1754         },
1755         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1756         .driver_info = SINGLE_RX_URB, /* firmware bug */
1757         },
1758         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1759         .driver_info = SINGLE_RX_URB, /* firmware bug */
1760         },
1761         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1762         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1763         },
1764         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1765         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1766         },
1767         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1768         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1769         },
1770         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1771         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1772         },
1773         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1774         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1775         },
1776         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1777         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1778         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1779         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1780         },
1781         /* Motorola H24 HSPA module: */
1782         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1783         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1784         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1785         },
1786         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1787         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1788         },
1789         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1790         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1791         },
1792         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1793         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1794         },
1795         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1796         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1797         },
1798         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1799         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1800         },
1801         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1802         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1803         },
1804
1805         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1806         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1807                                            data interface instead of
1808                                            communications interface.
1809                                            Maybe we should define a new
1810                                            quirk for this. */
1811         },
1812         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1813         .driver_info = NO_UNION_NORMAL,
1814         },
1815         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1816         .driver_info = NO_UNION_NORMAL,
1817         },
1818         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1819         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1820         },
1821         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1822         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1823         },
1824
1825         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1826         .driver_info = CLEAR_HALT_CONDITIONS,
1827         },
1828
1829         /* Nokia S60 phones expose two ACM channels. The first is
1830          * a modem and is picked up by the standard AT-command
1831          * information below. The second is 'vendor-specific' but
1832          * is treated as a serial device at the S60 end, so we want
1833          * to expose it on Linux too. */
1834         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1835         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1836         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1837         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1838         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1839         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1840         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1841         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1842         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1843         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1844         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1845         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1846         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1847         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1848         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1849         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1850         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1851         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1852         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1853         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1854         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1855         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1856         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1857         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1858         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1859         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1860         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1861         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1862         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1863         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1864         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1865         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1866         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1867         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1868         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1869         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1870         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1871         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1872         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1873         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1874         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1875         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1876         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1877         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1878         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1879         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1880         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1881         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1882         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1883         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1884         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1885         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1886         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1887         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1888         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1889         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1890         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1891         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1892
1893         /* Support for Owen devices */
1894         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1895
1896         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1897
1898         /* Support for Droids MuIn LCD */
1899         { USB_DEVICE(0x04d8, 0x000b),
1900         .driver_info = NO_DATA_INTERFACE,
1901         },
1902
1903 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1904         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1905         .driver_info = IGNORE_DEVICE,
1906         },
1907         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1908         .driver_info = IGNORE_DEVICE,
1909         },
1910 #endif
1911
1912         /*Samsung phone in firmware update mode */
1913         { USB_DEVICE(0x04e8, 0x685d),
1914         .driver_info = IGNORE_DEVICE,
1915         },
1916
1917         /* Exclude Infineon Flash Loader utility */
1918         { USB_DEVICE(0x058b, 0x0041),
1919         .driver_info = IGNORE_DEVICE,
1920         },
1921
1922         /* control interfaces without any protocol set */
1923         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1924                 USB_CDC_PROTO_NONE) },
1925
1926         /* control interfaces with various AT-command sets */
1927         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1928                 USB_CDC_ACM_PROTO_AT_V25TER) },
1929         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1930                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1931         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1932                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1933         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1934                 USB_CDC_ACM_PROTO_AT_GSM) },
1935         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1936                 USB_CDC_ACM_PROTO_AT_3G) },
1937         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1938                 USB_CDC_ACM_PROTO_AT_CDMA) },
1939
1940         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1941         .driver_info = SEND_ZERO_PACKET,
1942         },
1943
1944         { }
1945 };
1946
1947 MODULE_DEVICE_TABLE(usb, acm_ids);
1948
1949 static struct usb_driver acm_driver = {
1950         .name =         "cdc_acm",
1951         .probe =        acm_probe,
1952         .disconnect =   acm_disconnect,
1953 #ifdef CONFIG_PM
1954         .suspend =      acm_suspend,
1955         .resume =       acm_resume,
1956         .reset_resume = acm_reset_resume,
1957 #endif
1958         .id_table =     acm_ids,
1959 #ifdef CONFIG_PM
1960         .supports_autosuspend = 1,
1961 #endif
1962         .disable_hub_initiated_lpm = 1,
1963 };
1964
1965 /*
1966  * TTY driver structures.
1967  */
1968
1969 static const struct tty_operations acm_ops = {
1970         .install =              acm_tty_install,
1971         .open =                 acm_tty_open,
1972         .close =                acm_tty_close,
1973         .cleanup =              acm_tty_cleanup,
1974         .hangup =               acm_tty_hangup,
1975         .write =                acm_tty_write,
1976         .put_char =             acm_tty_put_char,
1977         .flush_chars =          acm_tty_flush_chars,
1978         .write_room =           acm_tty_write_room,
1979         .ioctl =                acm_tty_ioctl,
1980         .throttle =             acm_tty_throttle,
1981         .unthrottle =           acm_tty_unthrottle,
1982         .chars_in_buffer =      acm_tty_chars_in_buffer,
1983         .break_ctl =            acm_tty_break_ctl,
1984         .set_termios =          acm_tty_set_termios,
1985         .tiocmget =             acm_tty_tiocmget,
1986         .tiocmset =             acm_tty_tiocmset,
1987 };
1988
1989 /*
1990  * Init / exit.
1991  */
1992
1993 static int __init acm_init(void)
1994 {
1995         int retval;
1996         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1997         if (!acm_tty_driver)
1998                 return -ENOMEM;
1999         acm_tty_driver->driver_name = "acm",
2000         acm_tty_driver->name = "ttyACM",
2001         acm_tty_driver->major = ACM_TTY_MAJOR,
2002         acm_tty_driver->minor_start = 0,
2003         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2004         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2005         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2006         acm_tty_driver->init_termios = tty_std_termios;
2007         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2008                                                                 HUPCL | CLOCAL;
2009         tty_set_operations(acm_tty_driver, &acm_ops);
2010
2011         retval = tty_register_driver(acm_tty_driver);
2012         if (retval) {
2013                 put_tty_driver(acm_tty_driver);
2014                 return retval;
2015         }
2016
2017         retval = usb_register(&acm_driver);
2018         if (retval) {
2019                 tty_unregister_driver(acm_tty_driver);
2020                 put_tty_driver(acm_tty_driver);
2021                 return retval;
2022         }
2023
2024         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2025
2026         return 0;
2027 }
2028
2029 static void __exit acm_exit(void)
2030 {
2031         usb_deregister(&acm_driver);
2032         tty_unregister_driver(acm_tty_driver);
2033         put_tty_driver(acm_tty_driver);
2034         idr_destroy(&acm_minors);
2035 }
2036
2037 module_init(acm_init);
2038 module_exit(acm_exit);
2039
2040 MODULE_AUTHOR(DRIVER_AUTHOR);
2041 MODULE_DESCRIPTION(DRIVER_DESC);
2042 MODULE_LICENSE("GPL");
2043 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);