drivers/usb/class/cdc-acm.c

   1 /*
   2  * cdc-acm.c
   3  *
   4  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
   5  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
   6  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
   7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   8  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
   9  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
  10  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
  11  *
  12  * USB Abstract Control Model driver for USB modems and ISDN adapters
  13  *
  14  * Sponsored by SuSE
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  29  */
  30
  31 #undef DEBUG
  32 #undef VERBOSE_DEBUG
  33
  34 #include <linux/kernel.h>
  35 #include <linux/errno.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/tty.h>
  39 #include <linux/serial.h>
  40 #include <linux/tty_driver.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/module.h>
  43 #include <linux/mutex.h>
  44 #include <linux/uaccess.h>
  45 #include <linux/usb.h>
  46 #include <linux/usb/cdc.h>
  47 #include <asm/byteorder.h>
  48 #include <asm/unaligned.h>
  49 #include <linux/list.h>
  50
  51 #include "cdc-acm.h"
  52
  53
  54 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  55 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  56
  57 static struct usb_driver acm_driver;
  58 static struct tty_driver *acm_tty_driver;
  59 static struct acm *acm_table[ACM_TTY_MINORS];
  60
  61 static DEFINE_MUTEX(acm_table_lock);
  62
  63 /*
  64  * acm_table accessors
  65  */
  66
  67 /*
  68  * Look up an ACM structure by index. If found and not disconnected, increment
  69  * its refcount and return it with its mutex held.
  70  */
  71 static struct acm *acm_get_by_index(unsigned index)
  72 {
  73         struct acm *acm;
  74
  75         mutex_lock(&acm_table_lock);
  76         acm = acm_table[index];
  77         if (acm) {
  78                 mutex_lock(&acm->mutex);
  79                 if (acm->disconnected) {
  80                         mutex_unlock(&acm->mutex);
  81                         acm = NULL;
  82                 } else {
  83                         tty_port_get(&acm->port);
  84                         mutex_unlock(&acm->mutex);
  85                 }
  86         }
  87         mutex_unlock(&acm_table_lock);
  88         return acm;
  89 }
  90
  91 /*
  92  * Try to find an available minor number and if found, associate it with 'acm'.
  93  */
  94 static int acm_alloc_minor(struct acm *acm)
  95 {
  96         int minor;
  97
  98         mutex_lock(&acm_table_lock);
  99         for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
 100                 if (!acm_table[minor]) {
 101                         acm_table[minor] = acm;
 102                         break;
 103                 }
 104         }
 105         mutex_unlock(&acm_table_lock);
 106
 107         return minor;
 108 }
 109
 110 /* Release the minor number associated with 'acm'.  */
 111 static void acm_release_minor(struct acm *acm)
 112 {
 113         mutex_lock(&acm_table_lock);
 114         acm_table[acm->minor] = NULL;
 115         mutex_unlock(&acm_table_lock);
 116 }
 117
 118 /*
 119  * Functions for ACM control messages.
 120  */
 121
 122 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 123                                                         void *buf, int len)
 124 {
 125         int retval;
 126
 127         retval = usb_autopm_get_interface(acm->control);
 128         if (retval)
 129                 return retval;
 130
 131         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 132                 request, USB_RT_ACM, value,
 133                 acm->control->altsetting[0].desc.bInterfaceNumber,
 134                 buf, len, 5000);
 135
 136         dev_dbg(&acm->control->dev,
 137                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 138                         __func__, request, value, len, retval);
 139
 140         usb_autopm_put_interface(acm->control);
 141
 142         return retval < 0 ? retval : 0;
 143 }
 144
 145 /* devices aren't required to support these requests.
 146  * the cdc acm descriptor tells whether they do...
 147  */
 148 #define acm_set_control(acm, control) \
 149         acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
 150 #define acm_set_line(acm, line) \
 151         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 152 #define acm_send_break(acm, ms) \
 153         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 154
 155 /*
 156  * Write buffer management.
 157  * All of these assume proper locks taken by the caller.
 158  */
 159
 160 static int acm_wb_alloc(struct acm *acm)
 161 {
 162         int i, wbn;
 163         struct acm_wb *wb;
 164
 165         wbn = 0;
 166         i = 0;
 167         for (;;) {
 168                 wb = &acm->wb[wbn];
 169                 if (!wb->use) {
 170                         wb->use = 1;
 171                         return wbn;
 172                 }
 173                 wbn = (wbn + 1) % ACM_NW;
 174                 if (++i >= ACM_NW)
 175                         return -1;
 176         }
 177 }
 178
 179 static int acm_wb_is_avail(struct acm *acm)
 180 {
 181         int i, n;
 182         unsigned long flags;
 183
 184         n = ACM_NW;
 185         spin_lock_irqsave(&acm->write_lock, flags);
 186         for (i = 0; i < ACM_NW; i++)
 187                 n -= acm->wb[i].use;
 188         spin_unlock_irqrestore(&acm->write_lock, flags);
 189         return n;
 190 }
 191
 192 /*
 193  * Finish write. Caller must hold acm->write_lock
 194  */
 195 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 196 {
 197         wb->use = 0;
 198         acm->transmitting--;
 199         usb_autopm_put_interface_async(acm->control);
 200 }
 201
 202 /*
 203  * Poke write.
 204  *
 205  * the caller is responsible for locking
 206  */
 207
 208 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 209 {
 210         int rc;
 211
 212         acm->transmitting++;
 213
 214         wb->urb->transfer_buffer = wb->buf;
 215         wb->urb->transfer_dma = wb->dmah;
 216         wb->urb->transfer_buffer_length = wb->len;
 217         wb->urb->dev = acm->dev;
 218
 219         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 220         if (rc < 0) {
 221                 dev_err(&acm->data->dev,
 222                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 223                         __func__, rc);
 224                 acm_write_done(acm, wb);
 225         }
 226         return rc;
 227 }
 228
 229 /*
 230  * attributes exported through sysfs
 231  */
 232 static ssize_t show_caps
 233 (struct device *dev, struct device_attribute *attr, char *buf)
 234 {
 235         struct usb_interface *intf = to_usb_interface(dev);
 236         struct acm *acm = usb_get_intfdata(intf);
 237
 238         return sprintf(buf, "%d", acm->ctrl_caps);
 239 }
 240 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 241
 242 static ssize_t show_country_codes
 243 (struct device *dev, struct device_attribute *attr, char *buf)
 244 {
 245         struct usb_interface *intf = to_usb_interface(dev);
 246         struct acm *acm = usb_get_intfdata(intf);
 247
 248         memcpy(buf, acm->country_codes, acm->country_code_size);
 249         return acm->country_code_size;
 250 }
 251
 252 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 253
 254 static ssize_t show_country_rel_date
 255 (struct device *dev, struct device_attribute *attr, char *buf)
 256 {
 257         struct usb_interface *intf = to_usb_interface(dev);
 258         struct acm *acm = usb_get_intfdata(intf);
 259
 260         return sprintf(buf, "%d", acm->country_rel_date);
 261 }
 262
 263 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 264 /*
 265  * Interrupt handlers for various ACM device responses
 266  */
 267
 268 /* control interface reports status changes with "interrupt" transfers */
 269 static void acm_ctrl_irq(struct urb *urb)
 270 {
 271         struct acm *acm = urb->context;
 272         struct usb_cdc_notification *dr = urb->transfer_buffer;
 273         unsigned char *data;
 274         int newctrl;
 275         int difference;
 276         int retval;
 277         int status = urb->status;
 278
 279         switch (status) {
 280         case 0:
 281                 /* success */
 282                 break;
 283         case -ECONNRESET:
 284         case -ENOENT:
 285         case -ESHUTDOWN:
 286                 /* this urb is terminated, clean up */
 287                 dev_dbg(&acm->control->dev,
 288                                 "%s - urb shutting down with status: %d\n",
 289                                 __func__, status);
 290                 return;
 291         default:
 292                 dev_dbg(&acm->control->dev,
 293                                 "%s - nonzero urb status received: %d\n",
 294                                 __func__, status);
 295                 goto exit;
 296         }
 297
 298         usb_mark_last_busy(acm->dev);
 299
 300         data = (unsigned char *)(dr + 1);
 301         switch (dr->bNotificationType) {
 302         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 303                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
 304                                                         __func__, dr->wValue);
 305                 break;
 306
 307         case USB_CDC_NOTIFY_SERIAL_STATE:
 308                 newctrl = get_unaligned_le16(data);
 309
 310                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 311                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
 312                                         __func__);
 313                         tty_port_tty_hangup(&acm->port, false);
 314                 }
 315
 316                 difference = acm->ctrlin ^ newctrl;
 317                 spin_lock(&acm->read_lock);
 318                 acm->ctrlin = newctrl;
 319                 acm->oldcount = acm->iocount;
 320
 321                 if (difference & ACM_CTRL_DSR)
 322                         acm->iocount.dsr++;
 323                 if (difference & ACM_CTRL_BRK)
 324                         acm->iocount.brk++;
 325                 if (difference & ACM_CTRL_RI)
 326                         acm->iocount.rng++;
 327                 if (difference & ACM_CTRL_DCD)
 328                         acm->iocount.dcd++;
 329                 if (difference & ACM_CTRL_FRAMING)
 330                         acm->iocount.frame++;
 331                 if (difference & ACM_CTRL_PARITY)
 332                         acm->iocount.parity++;
 333                 if (difference & ACM_CTRL_OVERRUN)
 334                         acm->iocount.overrun++;
 335                 spin_unlock(&acm->read_lock);
 336
 337                 if (difference)
 338                         wake_up_all(&acm->wioctl);
 339
 340                 break;
 341
 342         default:
 343                 dev_dbg(&acm->control->dev,
 344                         "%s - unknown notification %d received: index %d "
 345                         "len %d data0 %d data1 %d\n",
 346                         __func__,
 347                         dr->bNotificationType, dr->wIndex,
 348                         dr->wLength, data[0], data[1]);
 349                 break;
 350         }
 351 exit:
 352         retval = usb_submit_urb(urb, GFP_ATOMIC);
 353         if (retval)
 354                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 355                                                         __func__, retval);
 356 }
 357
 358 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 359 {
 360         int res;
 361
 362         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 363                 return 0;
 364
 365         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
 366
 367         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 368         if (res) {
 369                 if (res != -EPERM) {
 370                         dev_err(&acm->data->dev,
 371                                         "%s - usb_submit_urb failed: %d\n",
 372                                         __func__, res);
 373                 }
 374                 set_bit(index, &acm->read_urbs_free);
 375                 return res;
 376         }
 377
 378         return 0;
 379 }
 380
 381 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 382 {
 383         int res;
 384         int i;
 385
 386         for (i = 0; i < acm->rx_buflimit; ++i) {
 387                 res = acm_submit_read_urb(acm, i, mem_flags);
 388                 if (res)
 389                         return res;
 390         }
 391
 392         return 0;
 393 }
 394
 395 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 396 {
 397         if (!urb->actual_length)
 398                 return;
 399
 400         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 401                         urb->actual_length);
 402         tty_flip_buffer_push(&acm->port);
 403 }
 404
 405 static void acm_read_bulk_callback(struct urb *urb)
 406 {
 407         struct acm_rb *rb = urb->context;
 408         struct acm *acm = rb->instance;
 409         unsigned long flags;
 410
 411         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
 412                                         rb->index, urb->actual_length);
 413         set_bit(rb->index, &acm->read_urbs_free);
 414
 415         if (!acm->dev) {
 416                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 417                 return;
 418         }
 419
 420         if (urb->status) {
 421                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
 422                                                         __func__, urb->status);
 423                 return;
 424         }
 425
 426         usb_mark_last_busy(acm->dev);
 427
 428         acm_process_read_urb(acm, urb);
 429
 430         /* throttle device if requested by tty */
 431         spin_lock_irqsave(&acm->read_lock, flags);
 432         acm->throttled = acm->throttle_req;
 433         if (!acm->throttled) {
 434                 spin_unlock_irqrestore(&acm->read_lock, flags);
 435                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 436         } else {
 437                 spin_unlock_irqrestore(&acm->read_lock, flags);
 438         }
 439 }
 440
 441 /* data interface wrote those outgoing bytes */
 442 static void acm_write_bulk(struct urb *urb)
 443 {
 444         struct acm_wb *wb = urb->context;
 445         struct acm *acm = wb->instance;
 446         unsigned long flags;
 447
 448         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
 449                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
 450                         __func__,
 451                         urb->actual_length,
 452                         urb->transfer_buffer_length,
 453                         urb->status);
 454
 455         spin_lock_irqsave(&acm->write_lock, flags);
 456         acm_write_done(acm, wb);
 457         spin_unlock_irqrestore(&acm->write_lock, flags);
 458         schedule_work(&acm->work);
 459 }
 460
 461 static void acm_softint(struct work_struct *work)
 462 {
 463         struct acm *acm = container_of(work, struct acm, work);
 464
 465         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 466
 467         tty_port_tty_wakeup(&acm->port);
 468 }
 469
 470 /*
 471  * TTY handlers
 472  */
 473
 474 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 475 {
 476         struct acm *acm;
 477         int retval;
 478
 479         dev_dbg(tty->dev, "%s\n", __func__);
 480
 481         acm = acm_get_by_index(tty->index);
 482         if (!acm)
 483                 return -ENODEV;
 484
 485         retval = tty_standard_install(driver, tty);
 486         if (retval)
 487                 goto error_init_termios;
 488
 489         tty->driver_data = acm;
 490
 491         return 0;
 492
 493 error_init_termios:
 494         tty_port_put(&acm->port);
 495         return retval;
 496 }
 497
 498 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 499 {
 500         struct acm *acm = tty->driver_data;
 501
 502         dev_dbg(tty->dev, "%s\n", __func__);
 503
 504         return tty_port_open(&acm->port, tty, filp);
 505 }
 506
 507 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 508 {
 509         struct acm *acm = container_of(port, struct acm, port);
 510         int retval = -ENODEV;
 511         int i;
 512
 513         dev_dbg(&acm->control->dev, "%s\n", __func__);
 514
 515         mutex_lock(&acm->mutex);
 516         if (acm->disconnected)
 517                 goto disconnected;
 518
 519         retval = usb_autopm_get_interface(acm->control);
 520         if (retval)
 521                 goto error_get_interface;
 522
 523         /*
 524          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 525          * memory is really nasty...
 526          */
 527         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 528         acm->control->needs_remote_wakeup = 1;
 529
 530         acm->ctrlurb->dev = acm->dev;
 531         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 532         if (retval) {
 533                 dev_err(&acm->control->dev,
 534                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 535                 goto error_submit_urb;
 536         }
 537
 538         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
 539         retval = acm_set_control(acm, acm->ctrlout);
 540         if (retval < 0 && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 541                 goto error_set_control;
 542
 543         /*
 544          * Unthrottle device in case the TTY was closed while throttled.
 545          */
 546         spin_lock_irq(&acm->read_lock);
 547         acm->throttled = 0;
 548         acm->throttle_req = 0;
 549         spin_unlock_irq(&acm->read_lock);
 550
 551         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 552         if (retval)
 553                 goto error_submit_read_urbs;
 554
 555         usb_autopm_put_interface(acm->control);
 556
 557         mutex_unlock(&acm->mutex);
 558
 559         return 0;
 560
 561 error_submit_read_urbs:
 562         for (i = 0; i < acm->rx_buflimit; i++)
 563                 usb_kill_urb(acm->read_urbs[i]);
 564         acm->ctrlout = 0;
 565         acm_set_control(acm, acm->ctrlout);
 566 error_set_control:
 567         usb_kill_urb(acm->ctrlurb);
 568 error_submit_urb:
 569         usb_autopm_put_interface(acm->control);
 570 error_get_interface:
 571 disconnected:
 572         mutex_unlock(&acm->mutex);
 573
 574         return usb_translate_errors(retval);
 575 }
 576
 577 static void acm_port_destruct(struct tty_port *port)
 578 {
 579         struct acm *acm = container_of(port, struct acm, port);
 580
 581         dev_dbg(&acm->control->dev, "%s\n", __func__);
 582
 583         acm_release_minor(acm);
 584         usb_put_intf(acm->control);
 585         kfree(acm->country_codes);
 586         kfree(acm);
 587 }
 588
 589 static void acm_port_shutdown(struct tty_port *port)
 590 {
 591         struct acm *acm = container_of(port, struct acm, port);
 592         struct urb *urb;
 593         struct acm_wb *wb;
 594         int i;
 595
 596         dev_dbg(&acm->control->dev, "%s\n", __func__);
 597
 598         acm_set_control(acm, acm->ctrlout = 0);
 599
 600         /*
 601          * Need to grab write_lock to prevent race with resume, but no need to
 602          * hold it due to the tty-port initialised flag.
 603          */
 604         spin_lock_irq(&acm->write_lock);
 605         spin_unlock_irq(&acm->write_lock);
 606
 607         usb_autopm_get_interface_no_resume(acm->control);
 608         acm->control->needs_remote_wakeup = 0;
 609         usb_autopm_put_interface(acm->control);
 610
 611         for (;;) {
 612                 urb = usb_get_from_anchor(&acm->delayed);
 613                 if (!urb)
 614                         break;
 615                 wb = urb->context;
 616                 wb->use = 0;
 617                 usb_autopm_put_interface_async(acm->control);
 618         }
 619
 620         usb_kill_urb(acm->ctrlurb);
 621         for (i = 0; i < ACM_NW; i++)
 622                 usb_kill_urb(acm->wb[i].urb);
 623         for (i = 0; i < acm->rx_buflimit; i++)
 624                 usb_kill_urb(acm->read_urbs[i]);
 625 }
 626
 627 static void acm_tty_cleanup(struct tty_struct *tty)
 628 {
 629         struct acm *acm = tty->driver_data;
 630         dev_dbg(&acm->control->dev, "%s\n", __func__);
 631         tty_port_put(&acm->port);
 632 }
 633
 634 static void acm_tty_hangup(struct tty_struct *tty)
 635 {
 636         struct acm *acm = tty->driver_data;
 637         dev_dbg(&acm->control->dev, "%s\n", __func__);
 638         tty_port_hangup(&acm->port);
 639 }
 640
 641 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 642 {
 643         struct acm *acm = tty->driver_data;
 644         dev_dbg(&acm->control->dev, "%s\n", __func__);
 645         tty_port_close(&acm->port, tty, filp);
 646 }
 647
 648 static int acm_tty_write(struct tty_struct *tty,
 649                                         const unsigned char *buf, int count)
 650 {
 651         struct acm *acm = tty->driver_data;
 652         int stat;
 653         unsigned long flags;
 654         int wbn;
 655         struct acm_wb *wb;
 656
 657         if (!count)
 658                 return 0;
 659
 660         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 661
 662         spin_lock_irqsave(&acm->write_lock, flags);
 663         wbn = acm_wb_alloc(acm);
 664         if (wbn < 0) {
 665                 spin_unlock_irqrestore(&acm->write_lock, flags);
 666                 return 0;
 667         }
 668         wb = &acm->wb[wbn];
 669
 670         if (!acm->dev) {
 671                 wb->use = 0;
 672                 spin_unlock_irqrestore(&acm->write_lock, flags);
 673                 return -ENODEV;
 674         }
 675
 676         count = (count > acm->writesize) ? acm->writesize : count;
 677         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 678         memcpy(wb->buf, buf, count);
 679         wb->len = count;
 680
 681         stat = usb_autopm_get_interface_async(acm->control);
 682         if (stat) {
 683                 wb->use = 0;
 684                 spin_unlock_irqrestore(&acm->write_lock, flags);
 685                 return stat;
 686         }
 687
 688         if (acm->susp_count) {
 689                 usb_anchor_urb(wb->urb, &acm->delayed);
 690                 spin_unlock_irqrestore(&acm->write_lock, flags);
 691                 return count;
 692         }
 693
 694         stat = acm_start_wb(acm, wb);
 695         spin_unlock_irqrestore(&acm->write_lock, flags);
 696
 697         if (stat < 0)
 698                 return stat;
 699         return count;
 700 }
 701
 702 static int acm_tty_write_room(struct tty_struct *tty)
 703 {
 704         struct acm *acm = tty->driver_data;
 705         /*
 706          * Do not let the line discipline to know that we have a reserve,
 707          * or it might get too enthusiastic.
 708          */
 709         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 710 }
 711
 712 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 713 {
 714         struct acm *acm = tty->driver_data;
 715         /*
 716          * if the device was unplugged then any remaining characters fell out
 717          * of the connector ;)
 718          */
 719         if (acm->disconnected)
 720                 return 0;
 721         /*
 722          * This is inaccurate (overcounts), but it works.
 723          */
 724         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 725 }
 726
 727 static void acm_tty_throttle(struct tty_struct *tty)
 728 {
 729         struct acm *acm = tty->driver_data;
 730
 731         spin_lock_irq(&acm->read_lock);
 732         acm->throttle_req = 1;
 733         spin_unlock_irq(&acm->read_lock);
 734 }
 735
 736 static void acm_tty_unthrottle(struct tty_struct *tty)
 737 {
 738         struct acm *acm = tty->driver_data;
 739         unsigned int was_throttled;
 740
 741         spin_lock_irq(&acm->read_lock);
 742         was_throttled = acm->throttled;
 743         acm->throttled = 0;
 744         acm->throttle_req = 0;
 745         spin_unlock_irq(&acm->read_lock);
 746
 747         if (was_throttled)
 748                 acm_submit_read_urbs(acm, GFP_KERNEL);
 749 }
 750
 751 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 752 {
 753         struct acm *acm = tty->driver_data;
 754         int retval;
 755
 756         retval = acm_send_break(acm, state ? 0xffff : 0);
 757         if (retval < 0)
 758                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 759                                                                 __func__);
 760         return retval;
 761 }
 762
 763 static int acm_tty_tiocmget(struct tty_struct *tty)
 764 {
 765         struct acm *acm = tty->driver_data;
 766
 767         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 768                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 769                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 770                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 771                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 772                TIOCM_CTS;
 773 }
 774
 775 static int acm_tty_tiocmset(struct tty_struct *tty,
 776                             unsigned int set, unsigned int clear)
 777 {
 778         struct acm *acm = tty->driver_data;
 779         unsigned int newctrl;
 780
 781         newctrl = acm->ctrlout;
 782         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 783                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 784         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 785                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 786
 787         newctrl = (newctrl & ~clear) | set;
 788
 789         if (acm->ctrlout == newctrl)
 790                 return 0;
 791         return acm_set_control(acm, acm->ctrlout = newctrl);
 792 }
 793
 794 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 795 {
 796         struct serial_struct tmp;
 797
 798         if (!info)
 799                 return -EINVAL;
 800
 801         memset(&tmp, 0, sizeof(tmp));
 802         tmp.flags = ASYNC_LOW_LATENCY;
 803         tmp.xmit_fifo_size = acm->writesize;
 804         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 805         tmp.close_delay = acm->port.close_delay / 10;
 806         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 807                                 ASYNC_CLOSING_WAIT_NONE :
 808                                 acm->port.closing_wait / 10;
 809
 810         if (copy_to_user(info, &tmp, sizeof(tmp)))
 811                 return -EFAULT;
 812         else
 813                 return 0;
 814 }
 815
 816 static int set_serial_info(struct acm *acm,
 817                                 struct serial_struct __user *newinfo)
 818 {
 819         struct serial_struct new_serial;
 820         unsigned int closing_wait, close_delay;
 821         int retval = 0;
 822
 823         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 824                 return -EFAULT;
 825
 826         close_delay = new_serial.close_delay * 10;
 827         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 828                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 829
 830         mutex_lock(&acm->port.mutex);
 831
 832         if (!capable(CAP_SYS_ADMIN)) {
 833                 if ((close_delay != acm->port.close_delay) ||
 834                     (closing_wait != acm->port.closing_wait))
 835                         retval = -EPERM;
 836                 else
 837                         retval = -EOPNOTSUPP;
 838         } else {
 839                 acm->port.close_delay  = close_delay;
 840                 acm->port.closing_wait = closing_wait;
 841         }
 842
 843         mutex_unlock(&acm->port.mutex);
 844         return retval;
 845 }
 846
 847 static int wait_serial_change(struct acm *acm, unsigned long arg)
 848 {
 849         int rv = 0;
 850         DECLARE_WAITQUEUE(wait, current);
 851         struct async_icount old, new;
 852
 853         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
 854                 return -EINVAL;
 855         do {
 856                 spin_lock_irq(&acm->read_lock);
 857                 old = acm->oldcount;
 858                 new = acm->iocount;
 859                 acm->oldcount = new;
 860                 spin_unlock_irq(&acm->read_lock);
 861
 862                 if ((arg & TIOCM_DSR) &&
 863                         old.dsr != new.dsr)
 864                         break;
 865                 if ((arg & TIOCM_CD)  &&
 866                         old.dcd != new.dcd)
 867                         break;
 868                 if ((arg & TIOCM_RI) &&
 869                         old.rng != new.rng)
 870                         break;
 871
 872                 add_wait_queue(&acm->wioctl, &wait);
 873                 set_current_state(TASK_INTERRUPTIBLE);
 874                 schedule();
 875                 remove_wait_queue(&acm->wioctl, &wait);
 876                 if (acm->disconnected) {
 877                         if (arg & TIOCM_CD)
 878                                 break;
 879                         else
 880                                 rv = -ENODEV;
 881                 } else {
 882                         if (signal_pending(current))
 883                                 rv = -ERESTARTSYS;
 884                 }
 885         } while (!rv);
 886
 887
 888
 889         return rv;
 890 }
 891
 892 static int get_serial_usage(struct acm *acm,
 893                             struct serial_icounter_struct __user *count)
 894 {
 895         struct serial_icounter_struct icount;
 896         int rv = 0;
 897
 898         memset(&icount, 0, sizeof(icount));
 899         icount.dsr = acm->iocount.dsr;
 900         icount.rng = acm->iocount.rng;
 901         icount.dcd = acm->iocount.dcd;
 902         icount.frame = acm->iocount.frame;
 903         icount.overrun = acm->iocount.overrun;
 904         icount.parity = acm->iocount.parity;
 905         icount.brk = acm->iocount.brk;
 906
 907         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 908                 rv = -EFAULT;
 909
 910         return rv;
 911 }
 912
 913 static int acm_tty_ioctl(struct tty_struct *tty,
 914                                         unsigned int cmd, unsigned long arg)
 915 {
 916         struct acm *acm = tty->driver_data;
 917         int rv = -ENOIOCTLCMD;
 918
 919         switch (cmd) {
 920         case TIOCGSERIAL: /* gets serial port data */
 921                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 922                 break;
 923         case TIOCSSERIAL:
 924                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 925                 break;
 926         case TIOCMIWAIT:
 927                 rv = usb_autopm_get_interface(acm->control);
 928                 if (rv < 0) {
 929                         rv = -EIO;
 930                         break;
 931                 }
 932                 rv = wait_serial_change(acm, arg);
 933                 usb_autopm_put_interface(acm->control);
 934                 break;
 935         case TIOCGICOUNT:
 936                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
 937                 break;
 938         }
 939
 940         return rv;
 941 }
 942
 943 static void acm_tty_set_termios(struct tty_struct *tty,
 944                                                 struct ktermios *termios_old)
 945 {
 946         struct acm *acm = tty->driver_data;
 947         struct ktermios *termios = &tty->termios;
 948         struct usb_cdc_line_coding newline;
 949         int newctrl = acm->ctrlout;
 950
 951         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 952         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 953         newline.bParityType = termios->c_cflag & PARENB ?
 954                                 (termios->c_cflag & PARODD ? 1 : 2) +
 955                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 956         switch (termios->c_cflag & CSIZE) {
 957         case CS5:
 958                 newline.bDataBits = 5;
 959                 break;
 960         case CS6:
 961                 newline.bDataBits = 6;
 962                 break;
 963         case CS7:
 964                 newline.bDataBits = 7;
 965                 break;
 966         case CS8:
 967         default:
 968                 newline.bDataBits = 8;
 969                 break;
 970         }
 971         /* FIXME: Needs to clear unsupported bits in the termios */
 972         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 973
 974         if (!newline.dwDTERate) {
 975                 newline.dwDTERate = acm->line.dwDTERate;
 976                 newctrl &= ~ACM_CTRL_DTR;
 977         } else
 978                 newctrl |=  ACM_CTRL_DTR;
 979
 980         if (newctrl != acm->ctrlout)
 981                 acm_set_control(acm, acm->ctrlout = newctrl);
 982
 983         if (memcmp(&acm->line, &newline, sizeof newline)) {
 984                 memcpy(&acm->line, &newline, sizeof newline);
 985                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 986                         __func__,
 987                         le32_to_cpu(newline.dwDTERate),
 988                         newline.bCharFormat, newline.bParityType,
 989                         newline.bDataBits);
 990                 acm_set_line(acm, &acm->line);
 991         }
 992 }
 993
 994 static const struct tty_port_operations acm_port_ops = {
 995         .shutdown = acm_port_shutdown,
 996         .activate = acm_port_activate,
 997         .destruct = acm_port_destruct,
 998 };
 999
1000 /*
1001  * USB probe and disconnect routines.
1002  */
1003
1004 /* Little helpers: write/read buffers free */
1005 static void acm_write_buffers_free(struct acm *acm)
1006 {
1007         int i;
1008         struct acm_wb *wb;
1009         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1010
1011         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1012                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1013 }
1014
1015 static void acm_read_buffers_free(struct acm *acm)
1016 {
1017         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1018         int i;
1019
1020         for (i = 0; i < acm->rx_buflimit; i++)
1021                 usb_free_coherent(usb_dev, acm->readsize,
1022                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1023 }
1024
1025 /* Little helper: write buffers allocate */
1026 static int acm_write_buffers_alloc(struct acm *acm)
1027 {
1028         int i;
1029         struct acm_wb *wb;
1030
1031         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1032                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1033                     &wb->dmah);
1034                 if (!wb->buf) {
1035                         while (i != 0) {
1036                                 --i;
1037                                 --wb;
1038                                 usb_free_coherent(acm->dev, acm->writesize,
1039                                     wb->buf, wb->dmah);
1040                         }
1041                         return -ENOMEM;
1042                 }
1043         }
1044         return 0;
1045 }
1046
1047 static int acm_probe(struct usb_interface *intf,
1048                      const struct usb_device_id *id)
1049 {
1050         struct usb_cdc_union_desc *union_header = NULL;
1051         struct usb_cdc_country_functional_desc *cfd = NULL;
1052         unsigned char *buffer = intf->altsetting->extra;
1053         int buflen = intf->altsetting->extralen;
1054         struct usb_interface *control_interface;
1055         struct usb_interface *data_interface;
1056         struct usb_endpoint_descriptor *epctrl = NULL;
1057         struct usb_endpoint_descriptor *epread = NULL;
1058         struct usb_endpoint_descriptor *epwrite = NULL;
1059         struct usb_device *usb_dev = interface_to_usbdev(intf);
1060         struct acm *acm;
1061         int minor;
1062         int ctrlsize, readsize;
1063         u8 *buf;
1064         u8 ac_management_function = 0;
1065         u8 call_management_function = 0;
1066         int call_interface_num = -1;
1067         int data_interface_num = -1;
1068         unsigned long quirks;
1069         int num_rx_buf;
1070         int i;
1071         int combined_interfaces = 0;
1072         struct device *tty_dev;
1073         int rv = -ENOMEM;
1074
1075         /* normal quirks */
1076         quirks = (unsigned long)id->driver_info;
1077
1078         if (quirks == IGNORE_DEVICE)
1079                 return -ENODEV;
1080
1081         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1082
1083         /* handle quirks deadly to normal probing*/
1084         if (quirks == NO_UNION_NORMAL) {
1085                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1086                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1087                 goto skip_normal_probe;
1088         }
1089
1090         /* normal probing*/
1091         if (!buffer) {
1092                 dev_err(&intf->dev, "Weird descriptor references\n");
1093                 return -EINVAL;
1094         }
1095
1096         if (!buflen) {
1097                 if (intf->cur_altsetting->endpoint &&
1098                                 intf->cur_altsetting->endpoint->extralen &&
1099                                 intf->cur_altsetting->endpoint->extra) {
1100                         dev_dbg(&intf->dev,
1101                                 "Seeking extra descriptors on endpoint\n");
1102                         buflen = intf->cur_altsetting->endpoint->extralen;
1103                         buffer = intf->cur_altsetting->endpoint->extra;
1104                 } else {
1105                         dev_err(&intf->dev,
1106                                 "Zero length descriptor references\n");
1107                         return -EINVAL;
1108                 }
1109         }
1110
1111         while (buflen > 0) {
1112                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1113                         dev_err(&intf->dev, "skipping garbage\n");
1114                         goto next_desc;
1115                 }
1116
1117                 switch (buffer[2]) {
1118                 case USB_CDC_UNION_TYPE: /* we've found it */
1119                         if (union_header) {
1120                                 dev_err(&intf->dev, "More than one "
1121                                         "union descriptor, skipping ...\n");
1122                                 goto next_desc;
1123                         }
1124                         union_header = (struct usb_cdc_union_desc *)buffer;
1125                         break;
1126                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1127                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1128                         break;
1129                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1130                         break; /* for now we ignore it */
1131                 case USB_CDC_ACM_TYPE:
1132                         ac_management_function = buffer[3];
1133                         break;
1134                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1135                         call_management_function = buffer[3];
1136                         call_interface_num = buffer[4];
1137                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1138                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1139                         break;
1140                 default:
1141                         /* there are LOTS more CDC descriptors that
1142                          * could legitimately be found here.
1143                          */
1144                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1145                                         "type %02x, length %d\n",
1146                                         buffer[2], buffer[0]);
1147                         break;
1148                 }
1149 next_desc:
1150                 buflen -= buffer[0];
1151                 buffer += buffer[0];
1152         }
1153
1154         if (!union_header) {
1155                 if (call_interface_num > 0) {
1156                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1157                         /* quirks for Droids MuIn LCD */
1158                         if (quirks & NO_DATA_INTERFACE)
1159                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1160                         else
1161                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1162                         control_interface = intf;
1163                 } else {
1164                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1165                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1166                                 return -ENODEV;
1167                         } else {
1168                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1169                                 combined_interfaces = 1;
1170                                 control_interface = data_interface = intf;
1171                                 goto look_for_collapsed_interface;
1172                         }
1173                 }
1174         } else {
1175                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1176                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1177                 if (!control_interface || !data_interface) {
1178                         dev_dbg(&intf->dev, "no interfaces\n");
1179                         return -ENODEV;
1180                 }
1181         }
1182
1183         if (data_interface_num != call_interface_num)
1184                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1185
1186         if (control_interface == data_interface) {
1187                 /* some broken devices designed for windows work this way */
1188                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1189                 combined_interfaces = 1;
1190                 /* a popular other OS doesn't use it */
1191                 quirks |= NO_CAP_LINE;
1192                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1193                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1194                         return -EINVAL;
1195                 }
1196 look_for_collapsed_interface:
1197                 for (i = 0; i < 3; i++) {
1198                         struct usb_endpoint_descriptor *ep;
1199                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1200
1201                         if (usb_endpoint_is_int_in(ep))
1202                                 epctrl = ep;
1203                         else if (usb_endpoint_is_bulk_out(ep))
1204                                 epwrite = ep;
1205                         else if (usb_endpoint_is_bulk_in(ep))
1206                                 epread = ep;
1207                         else
1208                                 return -EINVAL;
1209                 }
1210                 if (!epctrl || !epread || !epwrite)
1211                         return -ENODEV;
1212                 else
1213                         goto made_compressed_probe;
1214         }
1215
1216 skip_normal_probe:
1217
1218         /*workaround for switched interfaces */
1219         if (data_interface->cur_altsetting->desc.bInterfaceClass
1220                                                 != CDC_DATA_INTERFACE_TYPE) {
1221                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1222                                                 == CDC_DATA_INTERFACE_TYPE) {
1223                         struct usb_interface *t;
1224                         dev_dbg(&intf->dev,
1225                                 "Your device has switched interfaces.\n");
1226                         t = control_interface;
1227                         control_interface = data_interface;
1228                         data_interface = t;
1229                 } else {
1230                         return -EINVAL;
1231                 }
1232         }
1233
1234         /* Accept probe requests only for the control interface */
1235         if (!combined_interfaces && intf != control_interface)
1236                 return -ENODEV;
1237
1238         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1239                 /* valid in this context */
1240                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1241                 return -EBUSY;
1242         }
1243
1244
1245         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1246             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1247                 return -EINVAL;
1248
1249         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1250         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1251         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1252
1253
1254         /* workaround for switched endpoints */
1255         if (!usb_endpoint_dir_in(epread)) {
1256                 /* descriptors are swapped */
1257                 struct usb_endpoint_descriptor *t;
1258                 dev_dbg(&intf->dev,
1259                         "The data interface has switched endpoints\n");
1260                 t = epread;
1261                 epread = epwrite;
1262                 epwrite = t;
1263         }
1264 made_compressed_probe:
1265         dev_dbg(&intf->dev, "interfaces are valid\n");
1266
1267         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1268         if (acm == NULL) {
1269                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1270                 goto alloc_fail;
1271         }
1272
1273         minor = acm_alloc_minor(acm);
1274         if (minor == ACM_TTY_MINORS) {
1275                 dev_err(&intf->dev, "no more free acm devices\n");
1276                 kfree(acm);
1277                 return -ENODEV;
1278         }
1279
1280         ctrlsize = usb_endpoint_maxp(epctrl);
1281         readsize = usb_endpoint_maxp(epread) *
1282                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1283         acm->combined_interfaces = combined_interfaces;
1284         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1285         acm->control = control_interface;
1286         acm->data = data_interface;
1287         acm->minor = minor;
1288         acm->dev = usb_dev;
1289         acm->ctrl_caps = ac_management_function;
1290         if (quirks & NO_CAP_LINE)
1291                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1292         acm->ctrlsize = ctrlsize;
1293         acm->readsize = readsize;
1294         acm->rx_buflimit = num_rx_buf;
1295         INIT_WORK(&acm->work, acm_softint);
1296         init_waitqueue_head(&acm->wioctl);
1297         spin_lock_init(&acm->write_lock);
1298         spin_lock_init(&acm->read_lock);
1299         mutex_init(&acm->mutex);
1300         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1301         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1302         if (acm->is_int_ep)
1303                 acm->bInterval = epread->bInterval;
1304         tty_port_init(&acm->port);
1305         acm->port.ops = &acm_port_ops;
1306         init_usb_anchor(&acm->delayed);
1307
1308         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1309         if (!buf) {
1310                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1311                 goto alloc_fail2;
1312         }
1313         acm->ctrl_buffer = buf;
1314
1315         if (acm_write_buffers_alloc(acm) < 0) {
1316                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1317                 goto alloc_fail4;
1318         }
1319
1320         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1321         if (!acm->ctrlurb) {
1322                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1323                 goto alloc_fail5;
1324         }
1325         for (i = 0; i < num_rx_buf; i++) {
1326                 struct acm_rb *rb = &(acm->read_buffers[i]);
1327                 struct urb *urb;
1328
1329                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1330                                                                 &rb->dma);
1331                 if (!rb->base) {
1332                         dev_err(&intf->dev, "out of memory "
1333                                         "(read bufs usb_alloc_coherent)\n");
1334                         goto alloc_fail6;
1335                 }
1336                 rb->index = i;
1337                 rb->instance = acm;
1338
1339                 urb = usb_alloc_urb(0, GFP_KERNEL);
1340                 if (!urb) {
1341                         dev_err(&intf->dev,
1342                                 "out of memory (read urbs usb_alloc_urb)\n");
1343                         goto alloc_fail6;
1344                 }
1345                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1346                 urb->transfer_dma = rb->dma;
1347                 if (acm->is_int_ep) {
1348                         usb_fill_int_urb(urb, acm->dev,
1349                                          acm->rx_endpoint,
1350                                          rb->base,
1351                                          acm->readsize,
1352                                          acm_read_bulk_callback, rb,
1353                                          acm->bInterval);
1354                 } else {
1355                         usb_fill_bulk_urb(urb, acm->dev,
1356                                           acm->rx_endpoint,
1357                                           rb->base,
1358                                           acm->readsize,
1359                                           acm_read_bulk_callback, rb);
1360                 }
1361
1362                 acm->read_urbs[i] = urb;
1363                 __set_bit(i, &acm->read_urbs_free);
1364         }
1365         for (i = 0; i < ACM_NW; i++) {
1366                 struct acm_wb *snd = &(acm->wb[i]);
1367
1368                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1369                 if (snd->urb == NULL) {
1370                         dev_err(&intf->dev,
1371                                 "out of memory (write urbs usb_alloc_urb)\n");
1372                         goto alloc_fail7;
1373                 }
1374
1375                 if (usb_endpoint_xfer_int(epwrite))
1376                         usb_fill_int_urb(snd->urb, usb_dev,
1377                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1378                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1379                 else
1380                         usb_fill_bulk_urb(snd->urb, usb_dev,
1381                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1382                                 NULL, acm->writesize, acm_write_bulk, snd);
1383                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1384                 snd->instance = acm;
1385         }
1386
1387         usb_set_intfdata(intf, acm);
1388
1389         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1390         if (i < 0)
1391                 goto alloc_fail7;
1392
1393         if (cfd) { /* export the country data */
1394                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1395                 if (!acm->country_codes)
1396                         goto skip_countries;
1397                 acm->country_code_size = cfd->bLength - 4;
1398                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1399                                                         cfd->bLength - 4);
1400                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1401
1402                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1403                 if (i < 0) {
1404                         kfree(acm->country_codes);
1405                         acm->country_codes = NULL;
1406                         acm->country_code_size = 0;
1407                         goto skip_countries;
1408                 }
1409
1410                 i = device_create_file(&intf->dev,
1411                                                 &dev_attr_iCountryCodeRelDate);
1412                 if (i < 0) {
1413                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1414                         kfree(acm->country_codes);
1415                         acm->country_codes = NULL;
1416                         acm->country_code_size = 0;
1417                         goto skip_countries;
1418                 }
1419         }
1420
1421 skip_countries:
1422         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1423                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1424                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1425                          /* works around buggy devices */
1426                          epctrl->bInterval ? epctrl->bInterval : 16);
1427         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1428         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1429
1430         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1431
1432         acm_set_control(acm, acm->ctrlout);
1433
1434         acm->line.dwDTERate = cpu_to_le32(9600);
1435         acm->line.bDataBits = 8;
1436         acm_set_line(acm, &acm->line);
1437
1438         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1439         usb_set_intfdata(data_interface, acm);
1440
1441         usb_get_intf(control_interface);
1442         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1443                         &control_interface->dev);
1444         if (IS_ERR(tty_dev)) {
1445                 rv = PTR_ERR(tty_dev);
1446                 goto alloc_fail8;
1447         }
1448
1449         return 0;
1450 alloc_fail8:
1451         if (acm->country_codes) {
1452                 device_remove_file(&acm->control->dev,
1453                                 &dev_attr_wCountryCodes);
1454                 device_remove_file(&acm->control->dev,
1455                                 &dev_attr_iCountryCodeRelDate);
1456         }
1457         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1458 alloc_fail7:
1459         usb_set_intfdata(intf, NULL);
1460         for (i = 0; i < ACM_NW; i++)
1461                 usb_free_urb(acm->wb[i].urb);
1462 alloc_fail6:
1463         for (i = 0; i < num_rx_buf; i++)
1464                 usb_free_urb(acm->read_urbs[i]);
1465         acm_read_buffers_free(acm);
1466         usb_free_urb(acm->ctrlurb);
1467 alloc_fail5:
1468         acm_write_buffers_free(acm);
1469 alloc_fail4:
1470         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1471 alloc_fail2:
1472         acm_release_minor(acm);
1473         kfree(acm);
1474 alloc_fail:
1475         return rv;
1476 }
1477
1478 static void stop_data_traffic(struct acm *acm)
1479 {
1480         int i;
1481
1482         dev_dbg(&acm->control->dev, "%s\n", __func__);
1483
1484         usb_kill_urb(acm->ctrlurb);
1485         for (i = 0; i < ACM_NW; i++)
1486                 usb_kill_urb(acm->wb[i].urb);
1487         for (i = 0; i < acm->rx_buflimit; i++)
1488                 usb_kill_urb(acm->read_urbs[i]);
1489
1490         cancel_work_sync(&acm->work);
1491 }
1492
1493 static void acm_disconnect(struct usb_interface *intf)
1494 {
1495         struct acm *acm = usb_get_intfdata(intf);
1496         struct usb_device *usb_dev = interface_to_usbdev(intf);
1497         struct tty_struct *tty;
1498         int i;
1499
1500         dev_dbg(&intf->dev, "%s\n", __func__);
1501
1502         /* sibling interface is already cleaning up */
1503         if (!acm)
1504                 return;
1505
1506         mutex_lock(&acm->mutex);
1507         acm->disconnected = true;
1508         if (acm->country_codes) {
1509                 device_remove_file(&acm->control->dev,
1510                                 &dev_attr_wCountryCodes);
1511                 device_remove_file(&acm->control->dev,
1512                                 &dev_attr_iCountryCodeRelDate);
1513         }
1514         wake_up_all(&acm->wioctl);
1515         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1516         usb_set_intfdata(acm->control, NULL);
1517         usb_set_intfdata(acm->data, NULL);
1518         mutex_unlock(&acm->mutex);
1519
1520         tty = tty_port_tty_get(&acm->port);
1521         if (tty) {
1522                 tty_vhangup(tty);
1523                 tty_kref_put(tty);
1524         }
1525
1526         stop_data_traffic(acm);
1527
1528         tty_unregister_device(acm_tty_driver, acm->minor);
1529
1530         usb_free_urb(acm->ctrlurb);
1531         for (i = 0; i < ACM_NW; i++)
1532                 usb_free_urb(acm->wb[i].urb);
1533         for (i = 0; i < acm->rx_buflimit; i++)
1534                 usb_free_urb(acm->read_urbs[i]);
1535         acm_write_buffers_free(acm);
1536         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1537         acm_read_buffers_free(acm);
1538
1539         if (!acm->combined_interfaces)
1540                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1541                                         acm->data : acm->control);
1542
1543         tty_port_put(&acm->port);
1544 }
1545
1546 #ifdef CONFIG_PM
1547 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1548 {
1549         struct acm *acm = usb_get_intfdata(intf);
1550         int cnt;
1551
1552         spin_lock_irq(&acm->write_lock);
1553         if (PMSG_IS_AUTO(message)) {
1554                 if (acm->transmitting) {
1555                         spin_unlock_irq(&acm->write_lock);
1556                         return -EBUSY;
1557                 }
1558         }
1559         cnt = acm->susp_count++;
1560         spin_unlock_irq(&acm->write_lock);
1561
1562         if (cnt)
1563                 return 0;
1564
1565         stop_data_traffic(acm);
1566
1567         return 0;
1568 }
1569
1570 static int acm_resume(struct usb_interface *intf)
1571 {
1572         struct acm *acm = usb_get_intfdata(intf);
1573         struct urb *urb;
1574         int rv = 0;
1575
1576         spin_lock_irq(&acm->write_lock);
1577
1578         if (--acm->susp_count)
1579                 goto out;
1580
1581         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1582                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1583
1584                 for (;;) {
1585                         urb = usb_get_from_anchor(&acm->delayed);
1586                         if (!urb)
1587                                 break;
1588
1589                         acm_start_wb(acm, urb->context);
1590                 }
1591
1592                 /*
1593                  * delayed error checking because we must
1594                  * do the write path at all cost
1595                  */
1596                 if (rv < 0)
1597                         goto out;
1598
1599                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1600         }
1601 out:
1602         spin_unlock_irq(&acm->write_lock);
1603
1604         return rv;
1605 }
1606
1607 static int acm_reset_resume(struct usb_interface *intf)
1608 {
1609         struct acm *acm = usb_get_intfdata(intf);
1610
1611         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1612                 tty_port_tty_hangup(&acm->port, false);
1613
1614         return acm_resume(intf);
1615 }
1616
1617 #endif /* CONFIG_PM */
1618
1619 #define NOKIA_PCSUITE_ACM_INFO(x) \
1620                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1621                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1622                 USB_CDC_ACM_PROTO_VENDOR)
1623
1624 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1625                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1626                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1627                 USB_CDC_ACM_PROTO_VENDOR)
1628
1629 /*
1630  * USB driver structure.
1631  */
1632
1633 static const struct usb_device_id acm_ids[] = {
1634         /* quirky and broken devices */
1635         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1636         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1637         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1638         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1639         },
1640         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1641         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1642         },
1643         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1644         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1645         },
1646         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1647         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1648         },
1649         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1650         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1651         },
1652         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1653         .driver_info = SINGLE_RX_URB,
1654         },
1655         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1656         .driver_info = SINGLE_RX_URB, /* firmware bug */
1657         },
1658         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1659         .driver_info = SINGLE_RX_URB, /* firmware bug */
1660         },
1661         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1662         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1663         },
1664         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1665         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1666         },
1667         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1668         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1669         },
1670         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1671         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1672         },
1673         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1674         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1675         },
1676         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1677         },
1678         /* Motorola H24 HSPA module: */
1679         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1680         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1681         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1682         },
1683         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1684         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1685         },
1686         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1687         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1688         },
1689         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1690         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1691         },
1692         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1693         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1694         },
1695         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1696         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1697         },
1698         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1699         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1700         },
1701
1702         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1703         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1704                                            data interface instead of
1705                                            communications interface.
1706                                            Maybe we should define a new
1707                                            quirk for this. */
1708         },
1709         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1710         .driver_info = NO_UNION_NORMAL,
1711         },
1712         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1713         .driver_info = NO_UNION_NORMAL,
1714         },
1715         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1716         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1717         },
1718         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1719         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1720         },
1721
1722         /* Nokia S60 phones expose two ACM channels. The first is
1723          * a modem and is picked up by the standard AT-command
1724          * information below. The second is 'vendor-specific' but
1725          * is treated as a serial device at the S60 end, so we want
1726          * to expose it on Linux too. */
1727         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1728         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1729         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1730         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1731         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1732         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1733         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1734         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1735         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1736         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1737         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1738         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1739         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1740         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1741         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1742         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1743         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1744         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1745         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1746         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1747         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1748         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1749         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1750         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1751         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1752         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1753         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1754         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1755         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1756         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1757         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1758         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1759         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1760         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1761         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1762         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1763         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1764         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1765         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1766         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1767         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1768         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1769         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1770         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1771         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1772         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1773         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1774         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1775         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1776         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1777         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1778         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1779         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1780         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1781         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1782         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1783         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1784         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1785
1786         /* Support for Owen devices */
1787         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1788
1789         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1790
1791         /* Support Lego NXT using pbLua firmware */
1792         { USB_DEVICE(0x0694, 0xff00),
1793         .driver_info = NOT_A_MODEM,
1794         },
1795
1796         /* Support for Droids MuIn LCD */
1797         { USB_DEVICE(0x04d8, 0x000b),
1798         .driver_info = NO_DATA_INTERFACE,
1799         },
1800
1801 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1802         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1803         .driver_info = IGNORE_DEVICE,
1804         },
1805         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1806         .driver_info = IGNORE_DEVICE,
1807         },
1808 #endif
1809
1810         /* control interfaces without any protocol set */
1811         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1812                 USB_CDC_PROTO_NONE) },
1813
1814         /* control interfaces with various AT-command sets */
1815         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1816                 USB_CDC_ACM_PROTO_AT_V25TER) },
1817         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1818                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1819         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1820                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1821         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1822                 USB_CDC_ACM_PROTO_AT_GSM) },
1823         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1824                 USB_CDC_ACM_PROTO_AT_3G) },
1825         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1826                 USB_CDC_ACM_PROTO_AT_CDMA) },
1827
1828         { }
1829 };
1830
1831 MODULE_DEVICE_TABLE(usb, acm_ids);
1832
1833 static struct usb_driver acm_driver = {
1834         .name =         "cdc_acm",
1835         .probe =        acm_probe,
1836         .disconnect =   acm_disconnect,
1837 #ifdef CONFIG_PM
1838         .suspend =      acm_suspend,
1839         .resume =       acm_resume,
1840         .reset_resume = acm_reset_resume,
1841 #endif
1842         .id_table =     acm_ids,
1843 #ifdef CONFIG_PM
1844         .supports_autosuspend = 1,
1845 #endif
1846         .disable_hub_initiated_lpm = 1,
1847 };
1848
1849 /*
1850  * TTY driver structures.
1851  */
1852
1853 static const struct tty_operations acm_ops = {
1854         .install =              acm_tty_install,
1855         .open =                 acm_tty_open,
1856         .close =                acm_tty_close,
1857         .cleanup =              acm_tty_cleanup,
1858         .hangup =               acm_tty_hangup,
1859         .write =                acm_tty_write,
1860         .write_room =           acm_tty_write_room,
1861         .ioctl =                acm_tty_ioctl,
1862         .throttle =             acm_tty_throttle,
1863         .unthrottle =           acm_tty_unthrottle,
1864         .chars_in_buffer =      acm_tty_chars_in_buffer,
1865         .break_ctl =            acm_tty_break_ctl,
1866         .set_termios =          acm_tty_set_termios,
1867         .tiocmget =             acm_tty_tiocmget,
1868         .tiocmset =             acm_tty_tiocmset,
1869 };
1870
1871 /*
1872  * Init / exit.
1873  */
1874
1875 static int __init acm_init(void)
1876 {
1877         int retval;
1878         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1879         if (!acm_tty_driver)
1880                 return -ENOMEM;
1881         acm_tty_driver->driver_name = "acm",
1882         acm_tty_driver->name = "ttyACM",
1883         acm_tty_driver->major = ACM_TTY_MAJOR,
1884         acm_tty_driver->minor_start = 0,
1885         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1886         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1887         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1888         acm_tty_driver->init_termios = tty_std_termios;
1889         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1890                                                                 HUPCL | CLOCAL;
1891         tty_set_operations(acm_tty_driver, &acm_ops);
1892
1893         retval = tty_register_driver(acm_tty_driver);
1894         if (retval) {
1895                 put_tty_driver(acm_tty_driver);
1896                 return retval;
1897         }
1898
1899         retval = usb_register(&acm_driver);
1900         if (retval) {
1901                 tty_unregister_driver(acm_tty_driver);
1902                 put_tty_driver(acm_tty_driver);
1903                 return retval;
1904         }
1905
1906         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1907
1908         return 0;
1909 }
1910
1911 static void __exit acm_exit(void)
1912 {
1913         usb_deregister(&acm_driver);
1914         tty_unregister_driver(acm_tty_driver);
1915         put_tty_driver(acm_tty_driver);
1916 }
1917
1918 module_init(acm_init);
1919 module_exit(acm_exit);
1920
1921 MODULE_AUTHOR(DRIVER_AUTHOR);
1922 MODULE_DESCRIPTION(DRIVER_DESC);
1923 MODULE_LICENSE("GPL");
1924 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);