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         usb_mark_last_busy(acm->dev);
 420
 421         if (urb->status) {
 422                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
 423                                                         __func__, urb->status);
 424                 return;
 425         }
 426         acm_process_read_urb(acm, urb);
 427
 428         /* throttle device if requested by tty */
 429         spin_lock_irqsave(&acm->read_lock, flags);
 430         acm->throttled = acm->throttle_req;
 431         if (!acm->throttled && !acm->susp_count) {
 432                 spin_unlock_irqrestore(&acm->read_lock, flags);
 433                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 434         } else {
 435                 spin_unlock_irqrestore(&acm->read_lock, flags);
 436         }
 437 }
 438
 439 /* data interface wrote those outgoing bytes */
 440 static void acm_write_bulk(struct urb *urb)
 441 {
 442         struct acm_wb *wb = urb->context;
 443         struct acm *acm = wb->instance;
 444         unsigned long flags;
 445
 446         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
 447                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
 448                         __func__,
 449                         urb->actual_length,
 450                         urb->transfer_buffer_length,
 451                         urb->status);
 452
 453         spin_lock_irqsave(&acm->write_lock, flags);
 454         acm_write_done(acm, wb);
 455         spin_unlock_irqrestore(&acm->write_lock, flags);
 456         schedule_work(&acm->work);
 457 }
 458
 459 static void acm_softint(struct work_struct *work)
 460 {
 461         struct acm *acm = container_of(work, struct acm, work);
 462
 463         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 464
 465         tty_port_tty_wakeup(&acm->port);
 466 }
 467
 468 /*
 469  * TTY handlers
 470  */
 471
 472 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 473 {
 474         struct acm *acm;
 475         int retval;
 476
 477         dev_dbg(tty->dev, "%s\n", __func__);
 478
 479         acm = acm_get_by_index(tty->index);
 480         if (!acm)
 481                 return -ENODEV;
 482
 483         retval = tty_standard_install(driver, tty);
 484         if (retval)
 485                 goto error_init_termios;
 486
 487         tty->driver_data = acm;
 488
 489         return 0;
 490
 491 error_init_termios:
 492         tty_port_put(&acm->port);
 493         return retval;
 494 }
 495
 496 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 497 {
 498         struct acm *acm = tty->driver_data;
 499
 500         dev_dbg(tty->dev, "%s\n", __func__);
 501
 502         return tty_port_open(&acm->port, tty, filp);
 503 }
 504
 505 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 506 {
 507         struct acm *acm = container_of(port, struct acm, port);
 508         int retval = -ENODEV;
 509         int i;
 510
 511         dev_dbg(&acm->control->dev, "%s\n", __func__);
 512
 513         mutex_lock(&acm->mutex);
 514         if (acm->disconnected)
 515                 goto disconnected;
 516
 517         retval = usb_autopm_get_interface(acm->control);
 518         if (retval)
 519                 goto error_get_interface;
 520
 521         /*
 522          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 523          * memory is really nasty...
 524          */
 525         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 526         acm->control->needs_remote_wakeup = 1;
 527
 528         acm->ctrlurb->dev = acm->dev;
 529         if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
 530                 dev_err(&acm->control->dev,
 531                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 532                 goto error_submit_urb;
 533         }
 534
 535         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
 536         if (acm_set_control(acm, acm->ctrlout) < 0 &&
 537             (acm->ctrl_caps & USB_CDC_CAP_LINE))
 538                 goto error_set_control;
 539
 540         usb_autopm_put_interface(acm->control);
 541
 542         /*
 543          * Unthrottle device in case the TTY was closed while throttled.
 544          */
 545         spin_lock_irq(&acm->read_lock);
 546         acm->throttled = 0;
 547         acm->throttle_req = 0;
 548         spin_unlock_irq(&acm->read_lock);
 549
 550         if (acm_submit_read_urbs(acm, GFP_KERNEL))
 551                 goto error_submit_read_urbs;
 552
 553         mutex_unlock(&acm->mutex);
 554
 555         return 0;
 556
 557 error_submit_read_urbs:
 558         for (i = 0; i < acm->rx_buflimit; i++)
 559                 usb_kill_urb(acm->read_urbs[i]);
 560         acm->ctrlout = 0;
 561         acm_set_control(acm, acm->ctrlout);
 562 error_set_control:
 563         usb_kill_urb(acm->ctrlurb);
 564 error_submit_urb:
 565         usb_autopm_put_interface(acm->control);
 566 error_get_interface:
 567 disconnected:
 568         mutex_unlock(&acm->mutex);
 569         return retval;
 570 }
 571
 572 static void acm_port_destruct(struct tty_port *port)
 573 {
 574         struct acm *acm = container_of(port, struct acm, port);
 575
 576         dev_dbg(&acm->control->dev, "%s\n", __func__);
 577
 578         acm_release_minor(acm);
 579         usb_put_intf(acm->control);
 580         kfree(acm->country_codes);
 581         kfree(acm);
 582 }
 583
 584 static void acm_port_shutdown(struct tty_port *port)
 585 {
 586         struct acm *acm = container_of(port, struct acm, port);
 587         struct urb *urb;
 588         struct acm_wb *wb;
 589         int i;
 590         int pm_err;
 591
 592         dev_dbg(&acm->control->dev, "%s\n", __func__);
 593
 594         mutex_lock(&acm->mutex);
 595         if (!acm->disconnected) {
 596                 pm_err = usb_autopm_get_interface(acm->control);
 597                 acm_set_control(acm, acm->ctrlout = 0);
 598
 599                 for (;;) {
 600                         urb = usb_get_from_anchor(&acm->delayed);
 601                         if (!urb)
 602                                 break;
 603                         wb = urb->context;
 604                         wb->use = 0;
 605                         usb_autopm_put_interface_async(acm->control);
 606                 }
 607
 608                 usb_kill_urb(acm->ctrlurb);
 609                 for (i = 0; i < ACM_NW; i++)
 610                         usb_kill_urb(acm->wb[i].urb);
 611                 for (i = 0; i < acm->rx_buflimit; i++)
 612                         usb_kill_urb(acm->read_urbs[i]);
 613                 acm->control->needs_remote_wakeup = 0;
 614                 if (!pm_err)
 615                         usb_autopm_put_interface(acm->control);
 616         }
 617         mutex_unlock(&acm->mutex);
 618 }
 619
 620 static void acm_tty_cleanup(struct tty_struct *tty)
 621 {
 622         struct acm *acm = tty->driver_data;
 623         dev_dbg(&acm->control->dev, "%s\n", __func__);
 624         tty_port_put(&acm->port);
 625 }
 626
 627 static void acm_tty_hangup(struct tty_struct *tty)
 628 {
 629         struct acm *acm = tty->driver_data;
 630         dev_dbg(&acm->control->dev, "%s\n", __func__);
 631         tty_port_hangup(&acm->port);
 632 }
 633
 634 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 635 {
 636         struct acm *acm = tty->driver_data;
 637         dev_dbg(&acm->control->dev, "%s\n", __func__);
 638         tty_port_close(&acm->port, tty, filp);
 639 }
 640
 641 static int acm_tty_write(struct tty_struct *tty,
 642                                         const unsigned char *buf, int count)
 643 {
 644         struct acm *acm = tty->driver_data;
 645         int stat;
 646         unsigned long flags;
 647         int wbn;
 648         struct acm_wb *wb;
 649
 650         if (!count)
 651                 return 0;
 652
 653         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 654
 655         spin_lock_irqsave(&acm->write_lock, flags);
 656         wbn = acm_wb_alloc(acm);
 657         if (wbn < 0) {
 658                 spin_unlock_irqrestore(&acm->write_lock, flags);
 659                 return 0;
 660         }
 661         wb = &acm->wb[wbn];
 662
 663         if (!acm->dev) {
 664                 wb->use = 0;
 665                 spin_unlock_irqrestore(&acm->write_lock, flags);
 666                 return -ENODEV;
 667         }
 668
 669         count = (count > acm->writesize) ? acm->writesize : count;
 670         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 671         memcpy(wb->buf, buf, count);
 672         wb->len = count;
 673
 674         stat = usb_autopm_get_interface_async(acm->control);
 675         if (stat) {
 676                 wb->use = 0;
 677                 spin_unlock_irqrestore(&acm->write_lock, flags);
 678                 return stat;
 679         }
 680
 681         if (acm->susp_count) {
 682                 usb_anchor_urb(wb->urb, &acm->delayed);
 683                 spin_unlock_irqrestore(&acm->write_lock, flags);
 684                 return count;
 685         }
 686         usb_mark_last_busy(acm->dev);
 687
 688         stat = acm_start_wb(acm, wb);
 689         spin_unlock_irqrestore(&acm->write_lock, flags);
 690
 691         if (stat < 0)
 692                 return stat;
 693         return count;
 694 }
 695
 696 static int acm_tty_write_room(struct tty_struct *tty)
 697 {
 698         struct acm *acm = tty->driver_data;
 699         /*
 700          * Do not let the line discipline to know that we have a reserve,
 701          * or it might get too enthusiastic.
 702          */
 703         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 704 }
 705
 706 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 707 {
 708         struct acm *acm = tty->driver_data;
 709         /*
 710          * if the device was unplugged then any remaining characters fell out
 711          * of the connector ;)
 712          */
 713         if (acm->disconnected)
 714                 return 0;
 715         /*
 716          * This is inaccurate (overcounts), but it works.
 717          */
 718         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 719 }
 720
 721 static void acm_tty_throttle(struct tty_struct *tty)
 722 {
 723         struct acm *acm = tty->driver_data;
 724
 725         spin_lock_irq(&acm->read_lock);
 726         acm->throttle_req = 1;
 727         spin_unlock_irq(&acm->read_lock);
 728 }
 729
 730 static void acm_tty_unthrottle(struct tty_struct *tty)
 731 {
 732         struct acm *acm = tty->driver_data;
 733         unsigned int was_throttled;
 734
 735         spin_lock_irq(&acm->read_lock);
 736         was_throttled = acm->throttled;
 737         acm->throttled = 0;
 738         acm->throttle_req = 0;
 739         spin_unlock_irq(&acm->read_lock);
 740
 741         if (was_throttled)
 742                 acm_submit_read_urbs(acm, GFP_KERNEL);
 743 }
 744
 745 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 746 {
 747         struct acm *acm = tty->driver_data;
 748         int retval;
 749
 750         retval = acm_send_break(acm, state ? 0xffff : 0);
 751         if (retval < 0)
 752                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 753                                                                 __func__);
 754         return retval;
 755 }
 756
 757 static int acm_tty_tiocmget(struct tty_struct *tty)
 758 {
 759         struct acm *acm = tty->driver_data;
 760
 761         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 762                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 763                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 764                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 765                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 766                TIOCM_CTS;
 767 }
 768
 769 static int acm_tty_tiocmset(struct tty_struct *tty,
 770                             unsigned int set, unsigned int clear)
 771 {
 772         struct acm *acm = tty->driver_data;
 773         unsigned int newctrl;
 774
 775         newctrl = acm->ctrlout;
 776         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 777                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 778         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 779                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 780
 781         newctrl = (newctrl & ~clear) | set;
 782
 783         if (acm->ctrlout == newctrl)
 784                 return 0;
 785         return acm_set_control(acm, acm->ctrlout = newctrl);
 786 }
 787
 788 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 789 {
 790         struct serial_struct tmp;
 791
 792         if (!info)
 793                 return -EINVAL;
 794
 795         memset(&tmp, 0, sizeof(tmp));
 796         tmp.flags = ASYNC_LOW_LATENCY;
 797         tmp.xmit_fifo_size = acm->writesize;
 798         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 799         tmp.close_delay = acm->port.close_delay / 10;
 800         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 801                                 ASYNC_CLOSING_WAIT_NONE :
 802                                 acm->port.closing_wait / 10;
 803
 804         if (copy_to_user(info, &tmp, sizeof(tmp)))
 805                 return -EFAULT;
 806         else
 807                 return 0;
 808 }
 809
 810 static int set_serial_info(struct acm *acm,
 811                                 struct serial_struct __user *newinfo)
 812 {
 813         struct serial_struct new_serial;
 814         unsigned int closing_wait, close_delay;
 815         int retval = 0;
 816
 817         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 818                 return -EFAULT;
 819
 820         close_delay = new_serial.close_delay * 10;
 821         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 822                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 823
 824         mutex_lock(&acm->port.mutex);
 825
 826         if (!capable(CAP_SYS_ADMIN)) {
 827                 if ((close_delay != acm->port.close_delay) ||
 828                     (closing_wait != acm->port.closing_wait))
 829                         retval = -EPERM;
 830                 else
 831                         retval = -EOPNOTSUPP;
 832         } else {
 833                 acm->port.close_delay  = close_delay;
 834                 acm->port.closing_wait = closing_wait;
 835         }
 836
 837         mutex_unlock(&acm->port.mutex);
 838         return retval;
 839 }
 840
 841 static int wait_serial_change(struct acm *acm, unsigned long arg)
 842 {
 843         int rv = 0;
 844         DECLARE_WAITQUEUE(wait, current);
 845         struct async_icount old, new;
 846
 847         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
 848                 return -EINVAL;
 849         do {
 850                 spin_lock_irq(&acm->read_lock);
 851                 old = acm->oldcount;
 852                 new = acm->iocount;
 853                 acm->oldcount = new;
 854                 spin_unlock_irq(&acm->read_lock);
 855
 856                 if ((arg & TIOCM_DSR) &&
 857                         old.dsr != new.dsr)
 858                         break;
 859                 if ((arg & TIOCM_CD)  &&
 860                         old.dcd != new.dcd)
 861                         break;
 862                 if ((arg & TIOCM_RI) &&
 863                         old.rng != new.rng)
 864                         break;
 865
 866                 add_wait_queue(&acm->wioctl, &wait);
 867                 set_current_state(TASK_INTERRUPTIBLE);
 868                 schedule();
 869                 remove_wait_queue(&acm->wioctl, &wait);
 870                 if (acm->disconnected) {
 871                         if (arg & TIOCM_CD)
 872                                 break;
 873                         else
 874                                 rv = -ENODEV;
 875                 } else {
 876                         if (signal_pending(current))
 877                                 rv = -ERESTARTSYS;
 878                 }
 879         } while (!rv);
 880
 881
 882
 883         return rv;
 884 }
 885
 886 static int get_serial_usage(struct acm *acm,
 887                             struct serial_icounter_struct __user *count)
 888 {
 889         struct serial_icounter_struct icount;
 890         int rv = 0;
 891
 892         memset(&icount, 0, sizeof(icount));
 893         icount.dsr = acm->iocount.dsr;
 894         icount.rng = acm->iocount.rng;
 895         icount.dcd = acm->iocount.dcd;
 896         icount.frame = acm->iocount.frame;
 897         icount.overrun = acm->iocount.overrun;
 898         icount.parity = acm->iocount.parity;
 899         icount.brk = acm->iocount.brk;
 900
 901         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 902                 rv = -EFAULT;
 903
 904         return rv;
 905 }
 906
 907 static int acm_tty_ioctl(struct tty_struct *tty,
 908                                         unsigned int cmd, unsigned long arg)
 909 {
 910         struct acm *acm = tty->driver_data;
 911         int rv = -ENOIOCTLCMD;
 912
 913         switch (cmd) {
 914         case TIOCGSERIAL: /* gets serial port data */
 915                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 916                 break;
 917         case TIOCSSERIAL:
 918                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 919                 break;
 920         case TIOCMIWAIT:
 921                 rv = usb_autopm_get_interface(acm->control);
 922                 if (rv < 0) {
 923                         rv = -EIO;
 924                         break;
 925                 }
 926                 rv = wait_serial_change(acm, arg);
 927                 usb_autopm_put_interface(acm->control);
 928                 break;
 929         case TIOCGICOUNT:
 930                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
 931                 break;
 932         }
 933
 934         return rv;
 935 }
 936
 937 static void acm_tty_set_termios(struct tty_struct *tty,
 938                                                 struct ktermios *termios_old)
 939 {
 940         struct acm *acm = tty->driver_data;
 941         struct ktermios *termios = &tty->termios;
 942         struct usb_cdc_line_coding newline;
 943         int newctrl = acm->ctrlout;
 944
 945         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 946         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 947         newline.bParityType = termios->c_cflag & PARENB ?
 948                                 (termios->c_cflag & PARODD ? 1 : 2) +
 949                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 950         switch (termios->c_cflag & CSIZE) {
 951         case CS5:
 952                 newline.bDataBits = 5;
 953                 break;
 954         case CS6:
 955                 newline.bDataBits = 6;
 956                 break;
 957         case CS7:
 958                 newline.bDataBits = 7;
 959                 break;
 960         case CS8:
 961         default:
 962                 newline.bDataBits = 8;
 963                 break;
 964         }
 965         /* FIXME: Needs to clear unsupported bits in the termios */
 966         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 967
 968         if (C_BAUD(tty) == B0) {
 969                 newline.dwDTERate = acm->line.dwDTERate;
 970                 newctrl &= ~ACM_CTRL_DTR;
 971         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
 972                 newctrl |=  ACM_CTRL_DTR;
 973         }
 974
 975         if (newctrl != acm->ctrlout)
 976                 acm_set_control(acm, acm->ctrlout = newctrl);
 977
 978         if (memcmp(&acm->line, &newline, sizeof newline)) {
 979                 memcpy(&acm->line, &newline, sizeof newline);
 980                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 981                         __func__,
 982                         le32_to_cpu(newline.dwDTERate),
 983                         newline.bCharFormat, newline.bParityType,
 984                         newline.bDataBits);
 985                 acm_set_line(acm, &acm->line);
 986         }
 987 }
 988
 989 static const struct tty_port_operations acm_port_ops = {
 990         .shutdown = acm_port_shutdown,
 991         .activate = acm_port_activate,
 992         .destruct = acm_port_destruct,
 993 };
 994
 995 /*
 996  * USB probe and disconnect routines.
 997  */
 998
 999 /* Little helpers: write/read buffers free */
1000 static void acm_write_buffers_free(struct acm *acm)
1001 {
1002         int i;
1003         struct acm_wb *wb;
1004         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1005
1006         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1007                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1008 }
1009
1010 static void acm_read_buffers_free(struct acm *acm)
1011 {
1012         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1013         int i;
1014
1015         for (i = 0; i < acm->rx_buflimit; i++)
1016                 usb_free_coherent(usb_dev, acm->readsize,
1017                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1018 }
1019
1020 /* Little helper: write buffers allocate */
1021 static int acm_write_buffers_alloc(struct acm *acm)
1022 {
1023         int i;
1024         struct acm_wb *wb;
1025
1026         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1027                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1028                     &wb->dmah);
1029                 if (!wb->buf) {
1030                         while (i != 0) {
1031                                 --i;
1032                                 --wb;
1033                                 usb_free_coherent(acm->dev, acm->writesize,
1034                                     wb->buf, wb->dmah);
1035                         }
1036                         return -ENOMEM;
1037                 }
1038         }
1039         return 0;
1040 }
1041
1042 static int acm_probe(struct usb_interface *intf,
1043                      const struct usb_device_id *id)
1044 {
1045         struct usb_cdc_union_desc *union_header = NULL;
1046         struct usb_cdc_country_functional_desc *cfd = NULL;
1047         unsigned char *buffer = intf->altsetting->extra;
1048         int buflen = intf->altsetting->extralen;
1049         struct usb_interface *control_interface;
1050         struct usb_interface *data_interface;
1051         struct usb_endpoint_descriptor *epctrl = NULL;
1052         struct usb_endpoint_descriptor *epread = NULL;
1053         struct usb_endpoint_descriptor *epwrite = NULL;
1054         struct usb_device *usb_dev = interface_to_usbdev(intf);
1055         struct acm *acm;
1056         int minor;
1057         int ctrlsize, readsize;
1058         u8 *buf;
1059         u8 ac_management_function = 0;
1060         u8 call_management_function = 0;
1061         int call_interface_num = -1;
1062         int data_interface_num = -1;
1063         unsigned long quirks;
1064         int num_rx_buf;
1065         int i;
1066         int combined_interfaces = 0;
1067         struct device *tty_dev;
1068         int rv = -ENOMEM;
1069
1070         /* normal quirks */
1071         quirks = (unsigned long)id->driver_info;
1072
1073         if (quirks == IGNORE_DEVICE)
1074                 return -ENODEV;
1075
1076         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1077
1078         /* handle quirks deadly to normal probing*/
1079         if (quirks == NO_UNION_NORMAL) {
1080                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1081                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1082                 goto skip_normal_probe;
1083         }
1084
1085         /* normal probing*/
1086         if (!buffer) {
1087                 dev_err(&intf->dev, "Weird descriptor references\n");
1088                 return -EINVAL;
1089         }
1090
1091         if (!buflen) {
1092                 if (intf->cur_altsetting->endpoint &&
1093                                 intf->cur_altsetting->endpoint->extralen &&
1094                                 intf->cur_altsetting->endpoint->extra) {
1095                         dev_dbg(&intf->dev,
1096                                 "Seeking extra descriptors on endpoint\n");
1097                         buflen = intf->cur_altsetting->endpoint->extralen;
1098                         buffer = intf->cur_altsetting->endpoint->extra;
1099                 } else {
1100                         dev_err(&intf->dev,
1101                                 "Zero length descriptor references\n");
1102                         return -EINVAL;
1103                 }
1104         }
1105
1106         while (buflen > 0) {
1107                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1108                         dev_err(&intf->dev, "skipping garbage\n");
1109                         goto next_desc;
1110                 }
1111
1112                 switch (buffer[2]) {
1113                 case USB_CDC_UNION_TYPE: /* we've found it */
1114                         if (union_header) {
1115                                 dev_err(&intf->dev, "More than one "
1116                                         "union descriptor, skipping ...\n");
1117                                 goto next_desc;
1118                         }
1119                         union_header = (struct usb_cdc_union_desc *)buffer;
1120                         break;
1121                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1122                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1123                         break;
1124                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1125                         break; /* for now we ignore it */
1126                 case USB_CDC_ACM_TYPE:
1127                         ac_management_function = buffer[3];
1128                         break;
1129                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1130                         call_management_function = buffer[3];
1131                         call_interface_num = buffer[4];
1132                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1133                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1134                         break;
1135                 default:
1136                         /* there are LOTS more CDC descriptors that
1137                          * could legitimately be found here.
1138                          */
1139                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1140                                         "type %02x, length %d\n",
1141                                         buffer[2], buffer[0]);
1142                         break;
1143                 }
1144 next_desc:
1145                 buflen -= buffer[0];
1146                 buffer += buffer[0];
1147         }
1148
1149         if (!union_header) {
1150                 if (call_interface_num > 0) {
1151                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1152                         /* quirks for Droids MuIn LCD */
1153                         if (quirks & NO_DATA_INTERFACE)
1154                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1155                         else
1156                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1157                         control_interface = intf;
1158                 } else {
1159                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1160                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1161                                 return -ENODEV;
1162                         } else {
1163                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1164                                 combined_interfaces = 1;
1165                                 control_interface = data_interface = intf;
1166                                 goto look_for_collapsed_interface;
1167                         }
1168                 }
1169         } else {
1170                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1171                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1172                 if (!control_interface || !data_interface) {
1173                         dev_dbg(&intf->dev, "no interfaces\n");
1174                         return -ENODEV;
1175                 }
1176         }
1177
1178         if (data_interface_num != call_interface_num)
1179                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1180
1181         if (control_interface == data_interface) {
1182                 /* some broken devices designed for windows work this way */
1183                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1184                 combined_interfaces = 1;
1185                 /* a popular other OS doesn't use it */
1186                 quirks |= NO_CAP_LINE;
1187                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1188                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1189                         return -EINVAL;
1190                 }
1191 look_for_collapsed_interface:
1192                 for (i = 0; i < 3; i++) {
1193                         struct usb_endpoint_descriptor *ep;
1194                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1195
1196                         if (usb_endpoint_is_int_in(ep))
1197                                 epctrl = ep;
1198                         else if (usb_endpoint_is_bulk_out(ep))
1199                                 epwrite = ep;
1200                         else if (usb_endpoint_is_bulk_in(ep))
1201                                 epread = ep;
1202                         else
1203                                 return -EINVAL;
1204                 }
1205                 if (!epctrl || !epread || !epwrite)
1206                         return -ENODEV;
1207                 else
1208                         goto made_compressed_probe;
1209         }
1210
1211 skip_normal_probe:
1212
1213         /*workaround for switched interfaces */
1214         if (data_interface->cur_altsetting->desc.bInterfaceClass
1215                                                 != CDC_DATA_INTERFACE_TYPE) {
1216                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1217                                                 == CDC_DATA_INTERFACE_TYPE) {
1218                         struct usb_interface *t;
1219                         dev_dbg(&intf->dev,
1220                                 "Your device has switched interfaces.\n");
1221                         t = control_interface;
1222                         control_interface = data_interface;
1223                         data_interface = t;
1224                 } else {
1225                         return -EINVAL;
1226                 }
1227         }
1228
1229         /* Accept probe requests only for the control interface */
1230         if (!combined_interfaces && intf != control_interface)
1231                 return -ENODEV;
1232
1233         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1234                 /* valid in this context */
1235                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1236                 return -EBUSY;
1237         }
1238
1239
1240         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1241             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1242                 return -EINVAL;
1243
1244         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1245         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1246         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1247
1248
1249         /* workaround for switched endpoints */
1250         if (!usb_endpoint_dir_in(epread)) {
1251                 /* descriptors are swapped */
1252                 struct usb_endpoint_descriptor *t;
1253                 dev_dbg(&intf->dev,
1254                         "The data interface has switched endpoints\n");
1255                 t = epread;
1256                 epread = epwrite;
1257                 epwrite = t;
1258         }
1259 made_compressed_probe:
1260         dev_dbg(&intf->dev, "interfaces are valid\n");
1261
1262         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1263         if (acm == NULL) {
1264                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1265                 goto alloc_fail;
1266         }
1267
1268         minor = acm_alloc_minor(acm);
1269         if (minor == ACM_TTY_MINORS) {
1270                 dev_err(&intf->dev, "no more free acm devices\n");
1271                 kfree(acm);
1272                 return -ENODEV;
1273         }
1274
1275         ctrlsize = usb_endpoint_maxp(epctrl);
1276         readsize = usb_endpoint_maxp(epread) *
1277                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1278         acm->combined_interfaces = combined_interfaces;
1279         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1280         acm->control = control_interface;
1281         acm->data = data_interface;
1282         acm->minor = minor;
1283         acm->dev = usb_dev;
1284         acm->ctrl_caps = ac_management_function;
1285         if (quirks & NO_CAP_LINE)
1286                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1287         acm->ctrlsize = ctrlsize;
1288         acm->readsize = readsize;
1289         acm->rx_buflimit = num_rx_buf;
1290         INIT_WORK(&acm->work, acm_softint);
1291         init_waitqueue_head(&acm->wioctl);
1292         spin_lock_init(&acm->write_lock);
1293         spin_lock_init(&acm->read_lock);
1294         mutex_init(&acm->mutex);
1295         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1296         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1297         if (acm->is_int_ep)
1298                 acm->bInterval = epread->bInterval;
1299         tty_port_init(&acm->port);
1300         acm->port.ops = &acm_port_ops;
1301         init_usb_anchor(&acm->delayed);
1302
1303         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1304         if (!buf) {
1305                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1306                 goto alloc_fail2;
1307         }
1308         acm->ctrl_buffer = buf;
1309
1310         if (acm_write_buffers_alloc(acm) < 0) {
1311                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1312                 goto alloc_fail4;
1313         }
1314
1315         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1316         if (!acm->ctrlurb) {
1317                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1318                 goto alloc_fail5;
1319         }
1320         for (i = 0; i < num_rx_buf; i++) {
1321                 struct acm_rb *rb = &(acm->read_buffers[i]);
1322                 struct urb *urb;
1323
1324                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1325                                                                 &rb->dma);
1326                 if (!rb->base) {
1327                         dev_err(&intf->dev, "out of memory "
1328                                         "(read bufs usb_alloc_coherent)\n");
1329                         goto alloc_fail6;
1330                 }
1331                 rb->index = i;
1332                 rb->instance = acm;
1333
1334                 urb = usb_alloc_urb(0, GFP_KERNEL);
1335                 if (!urb) {
1336                         dev_err(&intf->dev,
1337                                 "out of memory (read urbs usb_alloc_urb)\n");
1338                         goto alloc_fail6;
1339                 }
1340                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1341                 urb->transfer_dma = rb->dma;
1342                 if (acm->is_int_ep) {
1343                         usb_fill_int_urb(urb, acm->dev,
1344                                          acm->rx_endpoint,
1345                                          rb->base,
1346                                          acm->readsize,
1347                                          acm_read_bulk_callback, rb,
1348                                          acm->bInterval);
1349                 } else {
1350                         usb_fill_bulk_urb(urb, acm->dev,
1351                                           acm->rx_endpoint,
1352                                           rb->base,
1353                                           acm->readsize,
1354                                           acm_read_bulk_callback, rb);
1355                 }
1356
1357                 acm->read_urbs[i] = urb;
1358                 __set_bit(i, &acm->read_urbs_free);
1359         }
1360         for (i = 0; i < ACM_NW; i++) {
1361                 struct acm_wb *snd = &(acm->wb[i]);
1362
1363                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1364                 if (snd->urb == NULL) {
1365                         dev_err(&intf->dev,
1366                                 "out of memory (write urbs usb_alloc_urb)\n");
1367                         goto alloc_fail7;
1368                 }
1369
1370                 if (usb_endpoint_xfer_int(epwrite))
1371                         usb_fill_int_urb(snd->urb, usb_dev,
1372                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1373                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1374                 else
1375                         usb_fill_bulk_urb(snd->urb, usb_dev,
1376                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1377                                 NULL, acm->writesize, acm_write_bulk, snd);
1378                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1379                 snd->instance = acm;
1380         }
1381
1382         usb_set_intfdata(intf, acm);
1383
1384         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1385         if (i < 0)
1386                 goto alloc_fail7;
1387
1388         if (cfd) { /* export the country data */
1389                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1390                 if (!acm->country_codes)
1391                         goto skip_countries;
1392                 acm->country_code_size = cfd->bLength - 4;
1393                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1394                                                         cfd->bLength - 4);
1395                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1396
1397                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1398                 if (i < 0) {
1399                         kfree(acm->country_codes);
1400                         acm->country_codes = NULL;
1401                         acm->country_code_size = 0;
1402                         goto skip_countries;
1403                 }
1404
1405                 i = device_create_file(&intf->dev,
1406                                                 &dev_attr_iCountryCodeRelDate);
1407                 if (i < 0) {
1408                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1409                         kfree(acm->country_codes);
1410                         acm->country_codes = NULL;
1411                         acm->country_code_size = 0;
1412                         goto skip_countries;
1413                 }
1414         }
1415
1416 skip_countries:
1417         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1418                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1419                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1420                          /* works around buggy devices */
1421                          epctrl->bInterval ? epctrl->bInterval : 16);
1422         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1423         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1424
1425         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1426
1427         acm_set_control(acm, acm->ctrlout);
1428
1429         acm->line.dwDTERate = cpu_to_le32(9600);
1430         acm->line.bDataBits = 8;
1431         acm_set_line(acm, &acm->line);
1432
1433         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1434         usb_set_intfdata(data_interface, acm);
1435
1436         usb_get_intf(control_interface);
1437         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1438                         &control_interface->dev);
1439         if (IS_ERR(tty_dev)) {
1440                 rv = PTR_ERR(tty_dev);
1441                 goto alloc_fail8;
1442         }
1443
1444         return 0;
1445 alloc_fail8:
1446         if (acm->country_codes) {
1447                 device_remove_file(&acm->control->dev,
1448                                 &dev_attr_wCountryCodes);
1449                 device_remove_file(&acm->control->dev,
1450                                 &dev_attr_iCountryCodeRelDate);
1451         }
1452         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1453 alloc_fail7:
1454         usb_set_intfdata(intf, NULL);
1455         for (i = 0; i < ACM_NW; i++)
1456                 usb_free_urb(acm->wb[i].urb);
1457 alloc_fail6:
1458         for (i = 0; i < num_rx_buf; i++)
1459                 usb_free_urb(acm->read_urbs[i]);
1460         acm_read_buffers_free(acm);
1461         usb_free_urb(acm->ctrlurb);
1462 alloc_fail5:
1463         acm_write_buffers_free(acm);
1464 alloc_fail4:
1465         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1466 alloc_fail2:
1467         acm_release_minor(acm);
1468         kfree(acm);
1469 alloc_fail:
1470         return rv;
1471 }
1472
1473 static void stop_data_traffic(struct acm *acm)
1474 {
1475         int i;
1476
1477         dev_dbg(&acm->control->dev, "%s\n", __func__);
1478
1479         usb_kill_urb(acm->ctrlurb);
1480         for (i = 0; i < ACM_NW; i++)
1481                 usb_kill_urb(acm->wb[i].urb);
1482         for (i = 0; i < acm->rx_buflimit; i++)
1483                 usb_kill_urb(acm->read_urbs[i]);
1484
1485         cancel_work_sync(&acm->work);
1486 }
1487
1488 static void acm_disconnect(struct usb_interface *intf)
1489 {
1490         struct acm *acm = usb_get_intfdata(intf);
1491         struct usb_device *usb_dev = interface_to_usbdev(intf);
1492         struct tty_struct *tty;
1493         int i;
1494
1495         dev_dbg(&intf->dev, "%s\n", __func__);
1496
1497         /* sibling interface is already cleaning up */
1498         if (!acm)
1499                 return;
1500
1501         mutex_lock(&acm->mutex);
1502         acm->disconnected = true;
1503         if (acm->country_codes) {
1504                 device_remove_file(&acm->control->dev,
1505                                 &dev_attr_wCountryCodes);
1506                 device_remove_file(&acm->control->dev,
1507                                 &dev_attr_iCountryCodeRelDate);
1508         }
1509         wake_up_all(&acm->wioctl);
1510         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1511         usb_set_intfdata(acm->control, NULL);
1512         usb_set_intfdata(acm->data, NULL);
1513         mutex_unlock(&acm->mutex);
1514
1515         tty = tty_port_tty_get(&acm->port);
1516         if (tty) {
1517                 tty_vhangup(tty);
1518                 tty_kref_put(tty);
1519         }
1520
1521         stop_data_traffic(acm);
1522
1523         tty_unregister_device(acm_tty_driver, acm->minor);
1524
1525         usb_free_urb(acm->ctrlurb);
1526         for (i = 0; i < ACM_NW; i++)
1527                 usb_free_urb(acm->wb[i].urb);
1528         for (i = 0; i < acm->rx_buflimit; i++)
1529                 usb_free_urb(acm->read_urbs[i]);
1530         acm_write_buffers_free(acm);
1531         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1532         acm_read_buffers_free(acm);
1533
1534         if (!acm->combined_interfaces)
1535                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1536                                         acm->data : acm->control);
1537
1538         tty_port_put(&acm->port);
1539 }
1540
1541 #ifdef CONFIG_PM
1542 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1543 {
1544         struct acm *acm = usb_get_intfdata(intf);
1545         int cnt;
1546
1547         spin_lock_irq(&acm->read_lock);
1548         spin_lock(&acm->write_lock);
1549         if (PMSG_IS_AUTO(message)) {
1550                 if (acm->transmitting) {
1551                         spin_unlock(&acm->write_lock);
1552                         spin_unlock_irq(&acm->read_lock);
1553                         return -EBUSY;
1554                 }
1555         }
1556         cnt = acm->susp_count++;
1557         spin_unlock(&acm->write_lock);
1558         spin_unlock_irq(&acm->read_lock);
1559
1560         if (cnt)
1561                 return 0;
1562
1563         stop_data_traffic(acm);
1564
1565         return 0;
1566 }
1567
1568 static int acm_resume(struct usb_interface *intf)
1569 {
1570         struct acm *acm = usb_get_intfdata(intf);
1571         struct urb *urb;
1572         int rv = 0;
1573
1574         spin_lock_irq(&acm->read_lock);
1575         spin_lock(&acm->write_lock);
1576
1577         if (--acm->susp_count)
1578                 goto out;
1579
1580         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1581                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1582
1583                 for (;;) {
1584                         urb = usb_get_from_anchor(&acm->delayed);
1585                         if (!urb)
1586                                 break;
1587
1588                         acm_start_wb(acm, urb->context);
1589                 }
1590
1591                 /*
1592                  * delayed error checking because we must
1593                  * do the write path at all cost
1594                  */
1595                 if (rv < 0)
1596                         goto out;
1597
1598                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1599         }
1600 out:
1601         spin_unlock(&acm->write_lock);
1602         spin_unlock_irq(&acm->read_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(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1677         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1678         },
1679         /* Motorola H24 HSPA module: */
1680         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1681         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1682         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1683         },
1684         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1685         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1686         },
1687         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1688         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1689         },
1690         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1691         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1692         },
1693         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1694         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1695         },
1696         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1697         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1698         },
1699         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1700         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1701         },
1702
1703         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1704         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1705                                            data interface instead of
1706                                            communications interface.
1707                                            Maybe we should define a new
1708                                            quirk for this. */
1709         },
1710         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1711         .driver_info = NO_UNION_NORMAL,
1712         },
1713         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1714         .driver_info = NO_UNION_NORMAL,
1715         },
1716         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1717         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1718         },
1719         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1720         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1721         },
1722
1723         /* Nokia S60 phones expose two ACM channels. The first is
1724          * a modem and is picked up by the standard AT-command
1725          * information below. The second is 'vendor-specific' but
1726          * is treated as a serial device at the S60 end, so we want
1727          * to expose it on Linux too. */
1728         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1729         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1730         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1731         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1732         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1733         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1734         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1735         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1736         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1737         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1738         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1739         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1740         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1741         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1742         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1743         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1744         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1745         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1746         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1747         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1748         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1749         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1750         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1751         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1752         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1753         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1754         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1755         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1756         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1757         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1758         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1759         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1760         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1761         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1762         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1763         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1764         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1765         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1766         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1767         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1768         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1769         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1770         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1771         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1772         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1773         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1774         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1775         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1776         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1777         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1778         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1779         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1780         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1781         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1782         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1783         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1784         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1785         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1786
1787         /* Support for Owen devices */
1788         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1789
1790         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1791
1792         /* Support Lego NXT using pbLua firmware */
1793         { USB_DEVICE(0x0694, 0xff00),
1794         .driver_info = NOT_A_MODEM,
1795         },
1796
1797         /* Support for Droids MuIn LCD */
1798         { USB_DEVICE(0x04d8, 0x000b),
1799         .driver_info = NO_DATA_INTERFACE,
1800         },
1801
1802 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1803         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1804         .driver_info = IGNORE_DEVICE,
1805         },
1806         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1807         .driver_info = IGNORE_DEVICE,
1808         },
1809 #endif
1810
1811         /* control interfaces without any protocol set */
1812         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1813                 USB_CDC_PROTO_NONE) },
1814
1815         /* control interfaces with various AT-command sets */
1816         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1817                 USB_CDC_ACM_PROTO_AT_V25TER) },
1818         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1819                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1820         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1821                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1822         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1823                 USB_CDC_ACM_PROTO_AT_GSM) },
1824         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1825                 USB_CDC_ACM_PROTO_AT_3G) },
1826         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1827                 USB_CDC_ACM_PROTO_AT_CDMA) },
1828
1829         { }
1830 };
1831
1832 MODULE_DEVICE_TABLE(usb, acm_ids);
1833
1834 static struct usb_driver acm_driver = {
1835         .name =         "cdc_acm",
1836         .probe =        acm_probe,
1837         .disconnect =   acm_disconnect,
1838 #ifdef CONFIG_PM
1839         .suspend =      acm_suspend,
1840         .resume =       acm_resume,
1841         .reset_resume = acm_reset_resume,
1842 #endif
1843         .id_table =     acm_ids,
1844 #ifdef CONFIG_PM
1845         .supports_autosuspend = 1,
1846 #endif
1847         .disable_hub_initiated_lpm = 1,
1848 };
1849
1850 /*
1851  * TTY driver structures.
1852  */
1853
1854 static const struct tty_operations acm_ops = {
1855         .install =              acm_tty_install,
1856         .open =                 acm_tty_open,
1857         .close =                acm_tty_close,
1858         .cleanup =              acm_tty_cleanup,
1859         .hangup =               acm_tty_hangup,
1860         .write =                acm_tty_write,
1861         .write_room =           acm_tty_write_room,
1862         .ioctl =                acm_tty_ioctl,
1863         .throttle =             acm_tty_throttle,
1864         .unthrottle =           acm_tty_unthrottle,
1865         .chars_in_buffer =      acm_tty_chars_in_buffer,
1866         .break_ctl =            acm_tty_break_ctl,
1867         .set_termios =          acm_tty_set_termios,
1868         .tiocmget =             acm_tty_tiocmget,
1869         .tiocmset =             acm_tty_tiocmset,
1870 };
1871
1872 /*
1873  * Init / exit.
1874  */
1875
1876 static int __init acm_init(void)
1877 {
1878         int retval;
1879         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1880         if (!acm_tty_driver)
1881                 return -ENOMEM;
1882         acm_tty_driver->driver_name = "acm",
1883         acm_tty_driver->name = "ttyACM",
1884         acm_tty_driver->major = ACM_TTY_MAJOR,
1885         acm_tty_driver->minor_start = 0,
1886         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1887         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1888         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1889         acm_tty_driver->init_termios = tty_std_termios;
1890         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1891                                                                 HUPCL | CLOCAL;
1892         tty_set_operations(acm_tty_driver, &acm_ops);
1893
1894         retval = tty_register_driver(acm_tty_driver);
1895         if (retval) {
1896                 put_tty_driver(acm_tty_driver);
1897                 return retval;
1898         }
1899
1900         retval = usb_register(&acm_driver);
1901         if (retval) {
1902                 tty_unregister_driver(acm_tty_driver);
1903                 put_tty_driver(acm_tty_driver);
1904                 return retval;
1905         }
1906
1907         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1908
1909         return 0;
1910 }
1911
1912 static void __exit acm_exit(void)
1913 {
1914         usb_deregister(&acm_driver);
1915         tty_unregister_driver(acm_tty_driver);
1916         put_tty_driver(acm_tty_driver);
1917 }
1918
1919 module_init(acm_init);
1920 module_exit(acm_exit);
1921
1922 MODULE_AUTHOR(DRIVER_AUTHOR);
1923 MODULE_DESCRIPTION(DRIVER_DESC);
1924 MODULE_LICENSE("GPL");
1925 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);