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
 510         dev_dbg(&acm->control->dev, "%s\n", __func__);
 511
 512         mutex_lock(&acm->mutex);
 513         if (acm->disconnected)
 514                 goto disconnected;
 515
 516         retval = usb_autopm_get_interface(acm->control);
 517         if (retval)
 518                 goto error_get_interface;
 519
 520         /*
 521          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 522          * memory is really nasty...
 523          */
 524         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 525         acm->control->needs_remote_wakeup = 1;
 526
 527         acm->ctrlurb->dev = acm->dev;
 528         if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
 529                 dev_err(&acm->control->dev,
 530                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 531                 goto error_submit_urb;
 532         }
 533
 534         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
 535         if (acm_set_control(acm, acm->ctrlout) < 0 &&
 536             (acm->ctrl_caps & USB_CDC_CAP_LINE))
 537                 goto error_set_control;
 538
 539         usb_autopm_put_interface(acm->control);
 540
 541         /*
 542          * Unthrottle device in case the TTY was closed while throttled.
 543          */
 544         spin_lock_irq(&acm->read_lock);
 545         acm->throttled = 0;
 546         acm->throttle_req = 0;
 547         spin_unlock_irq(&acm->read_lock);
 548
 549         if (acm_submit_read_urbs(acm, GFP_KERNEL))
 550                 goto error_submit_read_urbs;
 551
 552         mutex_unlock(&acm->mutex);
 553
 554         return 0;
 555
 556 error_submit_read_urbs:
 557         acm->ctrlout = 0;
 558         acm_set_control(acm, acm->ctrlout);
 559 error_set_control:
 560         usb_kill_urb(acm->ctrlurb);
 561 error_submit_urb:
 562         usb_autopm_put_interface(acm->control);
 563 error_get_interface:
 564 disconnected:
 565         mutex_unlock(&acm->mutex);
 566         return retval;
 567 }
 568
 569 static void acm_port_destruct(struct tty_port *port)
 570 {
 571         struct acm *acm = container_of(port, struct acm, port);
 572
 573         dev_dbg(&acm->control->dev, "%s\n", __func__);
 574
 575         acm_release_minor(acm);
 576         usb_put_intf(acm->control);
 577         kfree(acm->country_codes);
 578         kfree(acm);
 579 }
 580
 581 static void acm_port_shutdown(struct tty_port *port)
 582 {
 583         struct acm *acm = container_of(port, struct acm, port);
 584         struct urb *urb;
 585         struct acm_wb *wb;
 586         int i;
 587
 588         dev_dbg(&acm->control->dev, "%s\n", __func__);
 589
 590         mutex_lock(&acm->mutex);
 591         if (!acm->disconnected) {
 592                 usb_autopm_get_interface(acm->control);
 593                 acm_set_control(acm, acm->ctrlout = 0);
 594
 595                 for (;;) {
 596                         urb = usb_get_from_anchor(&acm->delayed);
 597                         if (!urb)
 598                                 break;
 599                         wb = urb->context;
 600                         wb->use = 0;
 601                         usb_autopm_put_interface_async(acm->control);
 602                 }
 603
 604                 usb_kill_urb(acm->ctrlurb);
 605                 for (i = 0; i < ACM_NW; i++)
 606                         usb_kill_urb(acm->wb[i].urb);
 607                 for (i = 0; i < acm->rx_buflimit; i++)
 608                         usb_kill_urb(acm->read_urbs[i]);
 609                 acm->control->needs_remote_wakeup = 0;
 610                 usb_autopm_put_interface(acm->control);
 611         }
 612         mutex_unlock(&acm->mutex);
 613 }
 614
 615 static void acm_tty_cleanup(struct tty_struct *tty)
 616 {
 617         struct acm *acm = tty->driver_data;
 618         dev_dbg(&acm->control->dev, "%s\n", __func__);
 619         tty_port_put(&acm->port);
 620 }
 621
 622 static void acm_tty_hangup(struct tty_struct *tty)
 623 {
 624         struct acm *acm = tty->driver_data;
 625         dev_dbg(&acm->control->dev, "%s\n", __func__);
 626         tty_port_hangup(&acm->port);
 627 }
 628
 629 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 630 {
 631         struct acm *acm = tty->driver_data;
 632         dev_dbg(&acm->control->dev, "%s\n", __func__);
 633         tty_port_close(&acm->port, tty, filp);
 634 }
 635
 636 static int acm_tty_write(struct tty_struct *tty,
 637                                         const unsigned char *buf, int count)
 638 {
 639         struct acm *acm = tty->driver_data;
 640         int stat;
 641         unsigned long flags;
 642         int wbn;
 643         struct acm_wb *wb;
 644
 645         if (!count)
 646                 return 0;
 647
 648         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 649
 650         spin_lock_irqsave(&acm->write_lock, flags);
 651         wbn = acm_wb_alloc(acm);
 652         if (wbn < 0) {
 653                 spin_unlock_irqrestore(&acm->write_lock, flags);
 654                 return 0;
 655         }
 656         wb = &acm->wb[wbn];
 657
 658         if (!acm->dev) {
 659                 wb->use = 0;
 660                 spin_unlock_irqrestore(&acm->write_lock, flags);
 661                 return -ENODEV;
 662         }
 663
 664         count = (count > acm->writesize) ? acm->writesize : count;
 665         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 666         memcpy(wb->buf, buf, count);
 667         wb->len = count;
 668
 669         stat = usb_autopm_get_interface_async(acm->control);
 670         if (stat) {
 671                 wb->use = 0;
 672                 spin_unlock_irqrestore(&acm->write_lock, flags);
 673                 return stat;
 674         }
 675
 676         if (acm->susp_count) {
 677                 usb_anchor_urb(wb->urb, &acm->delayed);
 678                 spin_unlock_irqrestore(&acm->write_lock, flags);
 679                 return count;
 680         }
 681         usb_mark_last_busy(acm->dev);
 682
 683         stat = acm_start_wb(acm, wb);
 684         spin_unlock_irqrestore(&acm->write_lock, flags);
 685
 686         if (stat < 0)
 687                 return stat;
 688         return count;
 689 }
 690
 691 static int acm_tty_write_room(struct tty_struct *tty)
 692 {
 693         struct acm *acm = tty->driver_data;
 694         /*
 695          * Do not let the line discipline to know that we have a reserve,
 696          * or it might get too enthusiastic.
 697          */
 698         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 699 }
 700
 701 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 702 {
 703         struct acm *acm = tty->driver_data;
 704         /*
 705          * if the device was unplugged then any remaining characters fell out
 706          * of the connector ;)
 707          */
 708         if (acm->disconnected)
 709                 return 0;
 710         /*
 711          * This is inaccurate (overcounts), but it works.
 712          */
 713         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 714 }
 715
 716 static void acm_tty_throttle(struct tty_struct *tty)
 717 {
 718         struct acm *acm = tty->driver_data;
 719
 720         spin_lock_irq(&acm->read_lock);
 721         acm->throttle_req = 1;
 722         spin_unlock_irq(&acm->read_lock);
 723 }
 724
 725 static void acm_tty_unthrottle(struct tty_struct *tty)
 726 {
 727         struct acm *acm = tty->driver_data;
 728         unsigned int was_throttled;
 729
 730         spin_lock_irq(&acm->read_lock);
 731         was_throttled = acm->throttled;
 732         acm->throttled = 0;
 733         acm->throttle_req = 0;
 734         spin_unlock_irq(&acm->read_lock);
 735
 736         if (was_throttled)
 737                 acm_submit_read_urbs(acm, GFP_KERNEL);
 738 }
 739
 740 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 741 {
 742         struct acm *acm = tty->driver_data;
 743         int retval;
 744
 745         retval = acm_send_break(acm, state ? 0xffff : 0);
 746         if (retval < 0)
 747                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 748                                                                 __func__);
 749         return retval;
 750 }
 751
 752 static int acm_tty_tiocmget(struct tty_struct *tty)
 753 {
 754         struct acm *acm = tty->driver_data;
 755
 756         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 757                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 758                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 759                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 760                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 761                TIOCM_CTS;
 762 }
 763
 764 static int acm_tty_tiocmset(struct tty_struct *tty,
 765                             unsigned int set, unsigned int clear)
 766 {
 767         struct acm *acm = tty->driver_data;
 768         unsigned int newctrl;
 769
 770         newctrl = acm->ctrlout;
 771         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 772                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 773         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 774                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 775
 776         newctrl = (newctrl & ~clear) | set;
 777
 778         if (acm->ctrlout == newctrl)
 779                 return 0;
 780         return acm_set_control(acm, acm->ctrlout = newctrl);
 781 }
 782
 783 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 784 {
 785         struct serial_struct tmp;
 786
 787         if (!info)
 788                 return -EINVAL;
 789
 790         memset(&tmp, 0, sizeof(tmp));
 791         tmp.flags = ASYNC_LOW_LATENCY;
 792         tmp.xmit_fifo_size = acm->writesize;
 793         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 794         tmp.close_delay = acm->port.close_delay / 10;
 795         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 796                                 ASYNC_CLOSING_WAIT_NONE :
 797                                 acm->port.closing_wait / 10;
 798
 799         if (copy_to_user(info, &tmp, sizeof(tmp)))
 800                 return -EFAULT;
 801         else
 802                 return 0;
 803 }
 804
 805 static int set_serial_info(struct acm *acm,
 806                                 struct serial_struct __user *newinfo)
 807 {
 808         struct serial_struct new_serial;
 809         unsigned int closing_wait, close_delay;
 810         int retval = 0;
 811
 812         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 813                 return -EFAULT;
 814
 815         close_delay = new_serial.close_delay * 10;
 816         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 817                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 818
 819         mutex_lock(&acm->port.mutex);
 820
 821         if (!capable(CAP_SYS_ADMIN)) {
 822                 if ((close_delay != acm->port.close_delay) ||
 823                     (closing_wait != acm->port.closing_wait))
 824                         retval = -EPERM;
 825                 else
 826                         retval = -EOPNOTSUPP;
 827         } else {
 828                 acm->port.close_delay  = close_delay;
 829                 acm->port.closing_wait = closing_wait;
 830         }
 831
 832         mutex_unlock(&acm->port.mutex);
 833         return retval;
 834 }
 835
 836 static int wait_serial_change(struct acm *acm, unsigned long arg)
 837 {
 838         int rv = 0;
 839         DECLARE_WAITQUEUE(wait, current);
 840         struct async_icount old, new;
 841
 842         if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
 843                 return -EINVAL;
 844         do {
 845                 spin_lock_irq(&acm->read_lock);
 846                 old = acm->oldcount;
 847                 new = acm->iocount;
 848                 acm->oldcount = new;
 849                 spin_unlock_irq(&acm->read_lock);
 850
 851                 if ((arg & TIOCM_DSR) &&
 852                         old.dsr != new.dsr)
 853                         break;
 854                 if ((arg & TIOCM_CD)  &&
 855                         old.dcd != new.dcd)
 856                         break;
 857                 if ((arg & TIOCM_RI) &&
 858                         old.rng != new.rng)
 859                         break;
 860
 861                 add_wait_queue(&acm->wioctl, &wait);
 862                 set_current_state(TASK_INTERRUPTIBLE);
 863                 schedule();
 864                 remove_wait_queue(&acm->wioctl, &wait);
 865                 if (acm->disconnected) {
 866                         if (arg & TIOCM_CD)
 867                                 break;
 868                         else
 869                                 rv = -ENODEV;
 870                 } else {
 871                         if (signal_pending(current))
 872                                 rv = -ERESTARTSYS;
 873                 }
 874         } while (!rv);
 875
 876
 877
 878         return rv;
 879 }
 880
 881 static int get_serial_usage(struct acm *acm,
 882                             struct serial_icounter_struct __user *count)
 883 {
 884         struct serial_icounter_struct icount;
 885         int rv = 0;
 886
 887         memset(&icount, 0, sizeof(icount));
 888         icount.dsr = acm->iocount.dsr;
 889         icount.rng = acm->iocount.rng;
 890         icount.dcd = acm->iocount.dcd;
 891         icount.frame = acm->iocount.frame;
 892         icount.overrun = acm->iocount.overrun;
 893         icount.parity = acm->iocount.parity;
 894         icount.brk = acm->iocount.brk;
 895
 896         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 897                 rv = -EFAULT;
 898
 899         return rv;
 900 }
 901
 902 static int acm_tty_ioctl(struct tty_struct *tty,
 903                                         unsigned int cmd, unsigned long arg)
 904 {
 905         struct acm *acm = tty->driver_data;
 906         int rv = -ENOIOCTLCMD;
 907
 908         switch (cmd) {
 909         case TIOCGSERIAL: /* gets serial port data */
 910                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 911                 break;
 912         case TIOCSSERIAL:
 913                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 914                 break;
 915         case TIOCMIWAIT:
 916                 rv = usb_autopm_get_interface(acm->control);
 917                 if (rv < 0) {
 918                         rv = -EIO;
 919                         break;
 920                 }
 921                 rv = wait_serial_change(acm, arg);
 922                 usb_autopm_put_interface(acm->control);
 923                 break;
 924         case TIOCGICOUNT:
 925                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
 926                 break;
 927         }
 928
 929         return rv;
 930 }
 931
 932 static void acm_tty_set_termios(struct tty_struct *tty,
 933                                                 struct ktermios *termios_old)
 934 {
 935         struct acm *acm = tty->driver_data;
 936         struct ktermios *termios = &tty->termios;
 937         struct usb_cdc_line_coding newline;
 938         int newctrl = acm->ctrlout;
 939
 940         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 941         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 942         newline.bParityType = termios->c_cflag & PARENB ?
 943                                 (termios->c_cflag & PARODD ? 1 : 2) +
 944                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 945         switch (termios->c_cflag & CSIZE) {
 946         case CS5:
 947                 newline.bDataBits = 5;
 948                 break;
 949         case CS6:
 950                 newline.bDataBits = 6;
 951                 break;
 952         case CS7:
 953                 newline.bDataBits = 7;
 954                 break;
 955         case CS8:
 956         default:
 957                 newline.bDataBits = 8;
 958                 break;
 959         }
 960         /* FIXME: Needs to clear unsupported bits in the termios */
 961         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 962
 963         if (!newline.dwDTERate) {
 964                 newline.dwDTERate = acm->line.dwDTERate;
 965                 newctrl &= ~ACM_CTRL_DTR;
 966         } else
 967                 newctrl |=  ACM_CTRL_DTR;
 968
 969         if (newctrl != acm->ctrlout)
 970                 acm_set_control(acm, acm->ctrlout = newctrl);
 971
 972         if (memcmp(&acm->line, &newline, sizeof newline)) {
 973                 memcpy(&acm->line, &newline, sizeof newline);
 974                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 975                         __func__,
 976                         le32_to_cpu(newline.dwDTERate),
 977                         newline.bCharFormat, newline.bParityType,
 978                         newline.bDataBits);
 979                 acm_set_line(acm, &acm->line);
 980         }
 981 }
 982
 983 static const struct tty_port_operations acm_port_ops = {
 984         .shutdown = acm_port_shutdown,
 985         .activate = acm_port_activate,
 986         .destruct = acm_port_destruct,
 987 };
 988
 989 /*
 990  * USB probe and disconnect routines.
 991  */
 992
 993 /* Little helpers: write/read buffers free */
 994 static void acm_write_buffers_free(struct acm *acm)
 995 {
 996         int i;
 997         struct acm_wb *wb;
 998         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 999
1000         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1001                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1002 }
1003
1004 static void acm_read_buffers_free(struct acm *acm)
1005 {
1006         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1007         int i;
1008
1009         for (i = 0; i < acm->rx_buflimit; i++)
1010                 usb_free_coherent(usb_dev, acm->readsize,
1011                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1012 }
1013
1014 /* Little helper: write buffers allocate */
1015 static int acm_write_buffers_alloc(struct acm *acm)
1016 {
1017         int i;
1018         struct acm_wb *wb;
1019
1020         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1021                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1022                     &wb->dmah);
1023                 if (!wb->buf) {
1024                         while (i != 0) {
1025                                 --i;
1026                                 --wb;
1027                                 usb_free_coherent(acm->dev, acm->writesize,
1028                                     wb->buf, wb->dmah);
1029                         }
1030                         return -ENOMEM;
1031                 }
1032         }
1033         return 0;
1034 }
1035
1036 static int acm_probe(struct usb_interface *intf,
1037                      const struct usb_device_id *id)
1038 {
1039         struct usb_cdc_union_desc *union_header = NULL;
1040         struct usb_cdc_country_functional_desc *cfd = NULL;
1041         unsigned char *buffer = intf->altsetting->extra;
1042         int buflen = intf->altsetting->extralen;
1043         struct usb_interface *control_interface;
1044         struct usb_interface *data_interface;
1045         struct usb_endpoint_descriptor *epctrl = NULL;
1046         struct usb_endpoint_descriptor *epread = NULL;
1047         struct usb_endpoint_descriptor *epwrite = NULL;
1048         struct usb_device *usb_dev = interface_to_usbdev(intf);
1049         struct acm *acm;
1050         int minor;
1051         int ctrlsize, readsize;
1052         u8 *buf;
1053         u8 ac_management_function = 0;
1054         u8 call_management_function = 0;
1055         int call_interface_num = -1;
1056         int data_interface_num = -1;
1057         unsigned long quirks;
1058         int num_rx_buf;
1059         int i;
1060         int combined_interfaces = 0;
1061         struct device *tty_dev;
1062         int rv = -ENOMEM;
1063
1064         /* normal quirks */
1065         quirks = (unsigned long)id->driver_info;
1066
1067         if (quirks == IGNORE_DEVICE)
1068                 return -ENODEV;
1069
1070         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1071
1072         /* handle quirks deadly to normal probing*/
1073         if (quirks == NO_UNION_NORMAL) {
1074                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1075                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1076                 goto skip_normal_probe;
1077         }
1078
1079         /* normal probing*/
1080         if (!buffer) {
1081                 dev_err(&intf->dev, "Weird descriptor references\n");
1082                 return -EINVAL;
1083         }
1084
1085         if (!buflen) {
1086                 if (intf->cur_altsetting->endpoint &&
1087                                 intf->cur_altsetting->endpoint->extralen &&
1088                                 intf->cur_altsetting->endpoint->extra) {
1089                         dev_dbg(&intf->dev,
1090                                 "Seeking extra descriptors on endpoint\n");
1091                         buflen = intf->cur_altsetting->endpoint->extralen;
1092                         buffer = intf->cur_altsetting->endpoint->extra;
1093                 } else {
1094                         dev_err(&intf->dev,
1095                                 "Zero length descriptor references\n");
1096                         return -EINVAL;
1097                 }
1098         }
1099
1100         while (buflen > 0) {
1101                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1102                         dev_err(&intf->dev, "skipping garbage\n");
1103                         goto next_desc;
1104                 }
1105
1106                 switch (buffer[2]) {
1107                 case USB_CDC_UNION_TYPE: /* we've found it */
1108                         if (union_header) {
1109                                 dev_err(&intf->dev, "More than one "
1110                                         "union descriptor, skipping ...\n");
1111                                 goto next_desc;
1112                         }
1113                         union_header = (struct usb_cdc_union_desc *)buffer;
1114                         break;
1115                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1116                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1117                         break;
1118                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1119                         break; /* for now we ignore it */
1120                 case USB_CDC_ACM_TYPE:
1121                         ac_management_function = buffer[3];
1122                         break;
1123                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1124                         call_management_function = buffer[3];
1125                         call_interface_num = buffer[4];
1126                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1127                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1128                         break;
1129                 default:
1130                         /* there are LOTS more CDC descriptors that
1131                          * could legitimately be found here.
1132                          */
1133                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1134                                         "type %02x, length %d\n",
1135                                         buffer[2], buffer[0]);
1136                         break;
1137                 }
1138 next_desc:
1139                 buflen -= buffer[0];
1140                 buffer += buffer[0];
1141         }
1142
1143         if (!union_header) {
1144                 if (call_interface_num > 0) {
1145                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1146                         /* quirks for Droids MuIn LCD */
1147                         if (quirks & NO_DATA_INTERFACE)
1148                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1149                         else
1150                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1151                         control_interface = intf;
1152                 } else {
1153                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1154                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1155                                 return -ENODEV;
1156                         } else {
1157                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1158                                 combined_interfaces = 1;
1159                                 control_interface = data_interface = intf;
1160                                 goto look_for_collapsed_interface;
1161                         }
1162                 }
1163         } else {
1164                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1165                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1166                 if (!control_interface || !data_interface) {
1167                         dev_dbg(&intf->dev, "no interfaces\n");
1168                         return -ENODEV;
1169                 }
1170         }
1171
1172         if (data_interface_num != call_interface_num)
1173                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1174
1175         if (control_interface == data_interface) {
1176                 /* some broken devices designed for windows work this way */
1177                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1178                 combined_interfaces = 1;
1179                 /* a popular other OS doesn't use it */
1180                 quirks |= NO_CAP_LINE;
1181                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1182                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1183                         return -EINVAL;
1184                 }
1185 look_for_collapsed_interface:
1186                 for (i = 0; i < 3; i++) {
1187                         struct usb_endpoint_descriptor *ep;
1188                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1189
1190                         if (usb_endpoint_is_int_in(ep))
1191                                 epctrl = ep;
1192                         else if (usb_endpoint_is_bulk_out(ep))
1193                                 epwrite = ep;
1194                         else if (usb_endpoint_is_bulk_in(ep))
1195                                 epread = ep;
1196                         else
1197                                 return -EINVAL;
1198                 }
1199                 if (!epctrl || !epread || !epwrite)
1200                         return -ENODEV;
1201                 else
1202                         goto made_compressed_probe;
1203         }
1204
1205 skip_normal_probe:
1206
1207         /*workaround for switched interfaces */
1208         if (data_interface->cur_altsetting->desc.bInterfaceClass
1209                                                 != CDC_DATA_INTERFACE_TYPE) {
1210                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1211                                                 == CDC_DATA_INTERFACE_TYPE) {
1212                         struct usb_interface *t;
1213                         dev_dbg(&intf->dev,
1214                                 "Your device has switched interfaces.\n");
1215                         t = control_interface;
1216                         control_interface = data_interface;
1217                         data_interface = t;
1218                 } else {
1219                         return -EINVAL;
1220                 }
1221         }
1222
1223         /* Accept probe requests only for the control interface */
1224         if (!combined_interfaces && intf != control_interface)
1225                 return -ENODEV;
1226
1227         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1228                 /* valid in this context */
1229                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1230                 return -EBUSY;
1231         }
1232
1233
1234         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1235             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1236                 return -EINVAL;
1237
1238         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1239         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1240         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1241
1242
1243         /* workaround for switched endpoints */
1244         if (!usb_endpoint_dir_in(epread)) {
1245                 /* descriptors are swapped */
1246                 struct usb_endpoint_descriptor *t;
1247                 dev_dbg(&intf->dev,
1248                         "The data interface has switched endpoints\n");
1249                 t = epread;
1250                 epread = epwrite;
1251                 epwrite = t;
1252         }
1253 made_compressed_probe:
1254         dev_dbg(&intf->dev, "interfaces are valid\n");
1255
1256         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1257         if (acm == NULL) {
1258                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1259                 goto alloc_fail;
1260         }
1261
1262         minor = acm_alloc_minor(acm);
1263         if (minor == ACM_TTY_MINORS) {
1264                 dev_err(&intf->dev, "no more free acm devices\n");
1265                 kfree(acm);
1266                 return -ENODEV;
1267         }
1268
1269         ctrlsize = usb_endpoint_maxp(epctrl);
1270         readsize = usb_endpoint_maxp(epread) *
1271                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1272         acm->combined_interfaces = combined_interfaces;
1273         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1274         acm->control = control_interface;
1275         acm->data = data_interface;
1276         acm->minor = minor;
1277         acm->dev = usb_dev;
1278         acm->ctrl_caps = ac_management_function;
1279         if (quirks & NO_CAP_LINE)
1280                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1281         acm->ctrlsize = ctrlsize;
1282         acm->readsize = readsize;
1283         acm->rx_buflimit = num_rx_buf;
1284         INIT_WORK(&acm->work, acm_softint);
1285         init_waitqueue_head(&acm->wioctl);
1286         spin_lock_init(&acm->write_lock);
1287         spin_lock_init(&acm->read_lock);
1288         mutex_init(&acm->mutex);
1289         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1290         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1291         if (acm->is_int_ep)
1292                 acm->bInterval = epread->bInterval;
1293         tty_port_init(&acm->port);
1294         acm->port.ops = &acm_port_ops;
1295         init_usb_anchor(&acm->delayed);
1296
1297         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1298         if (!buf) {
1299                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1300                 goto alloc_fail2;
1301         }
1302         acm->ctrl_buffer = buf;
1303
1304         if (acm_write_buffers_alloc(acm) < 0) {
1305                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1306                 goto alloc_fail4;
1307         }
1308
1309         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1310         if (!acm->ctrlurb) {
1311                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1312                 goto alloc_fail5;
1313         }
1314         for (i = 0; i < num_rx_buf; i++) {
1315                 struct acm_rb *rb = &(acm->read_buffers[i]);
1316                 struct urb *urb;
1317
1318                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1319                                                                 &rb->dma);
1320                 if (!rb->base) {
1321                         dev_err(&intf->dev, "out of memory "
1322                                         "(read bufs usb_alloc_coherent)\n");
1323                         goto alloc_fail6;
1324                 }
1325                 rb->index = i;
1326                 rb->instance = acm;
1327
1328                 urb = usb_alloc_urb(0, GFP_KERNEL);
1329                 if (!urb) {
1330                         dev_err(&intf->dev,
1331                                 "out of memory (read urbs usb_alloc_urb)\n");
1332                         goto alloc_fail6;
1333                 }
1334                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1335                 urb->transfer_dma = rb->dma;
1336                 if (acm->is_int_ep) {
1337                         usb_fill_int_urb(urb, acm->dev,
1338                                          acm->rx_endpoint,
1339                                          rb->base,
1340                                          acm->readsize,
1341                                          acm_read_bulk_callback, rb,
1342                                          acm->bInterval);
1343                 } else {
1344                         usb_fill_bulk_urb(urb, acm->dev,
1345                                           acm->rx_endpoint,
1346                                           rb->base,
1347                                           acm->readsize,
1348                                           acm_read_bulk_callback, rb);
1349                 }
1350
1351                 acm->read_urbs[i] = urb;
1352                 __set_bit(i, &acm->read_urbs_free);
1353         }
1354         for (i = 0; i < ACM_NW; i++) {
1355                 struct acm_wb *snd = &(acm->wb[i]);
1356
1357                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1358                 if (snd->urb == NULL) {
1359                         dev_err(&intf->dev,
1360                                 "out of memory (write urbs usb_alloc_urb)\n");
1361                         goto alloc_fail7;
1362                 }
1363
1364                 if (usb_endpoint_xfer_int(epwrite))
1365                         usb_fill_int_urb(snd->urb, usb_dev,
1366                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1367                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1368                 else
1369                         usb_fill_bulk_urb(snd->urb, usb_dev,
1370                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1371                                 NULL, acm->writesize, acm_write_bulk, snd);
1372                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1373                 snd->instance = acm;
1374         }
1375
1376         usb_set_intfdata(intf, acm);
1377
1378         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1379         if (i < 0)
1380                 goto alloc_fail7;
1381
1382         if (cfd) { /* export the country data */
1383                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1384                 if (!acm->country_codes)
1385                         goto skip_countries;
1386                 acm->country_code_size = cfd->bLength - 4;
1387                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1388                                                         cfd->bLength - 4);
1389                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1390
1391                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1392                 if (i < 0) {
1393                         kfree(acm->country_codes);
1394                         acm->country_codes = NULL;
1395                         acm->country_code_size = 0;
1396                         goto skip_countries;
1397                 }
1398
1399                 i = device_create_file(&intf->dev,
1400                                                 &dev_attr_iCountryCodeRelDate);
1401                 if (i < 0) {
1402                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1403                         kfree(acm->country_codes);
1404                         acm->country_codes = NULL;
1405                         acm->country_code_size = 0;
1406                         goto skip_countries;
1407                 }
1408         }
1409
1410 skip_countries:
1411         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1412                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1413                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1414                          /* works around buggy devices */
1415                          epctrl->bInterval ? epctrl->bInterval : 16);
1416         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1417         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1418
1419         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1420
1421         acm_set_control(acm, acm->ctrlout);
1422
1423         acm->line.dwDTERate = cpu_to_le32(9600);
1424         acm->line.bDataBits = 8;
1425         acm_set_line(acm, &acm->line);
1426
1427         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1428         usb_set_intfdata(data_interface, acm);
1429
1430         usb_get_intf(control_interface);
1431         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1432                         &control_interface->dev);
1433         if (IS_ERR(tty_dev)) {
1434                 rv = PTR_ERR(tty_dev);
1435                 goto alloc_fail8;
1436         }
1437
1438         return 0;
1439 alloc_fail8:
1440         if (acm->country_codes) {
1441                 device_remove_file(&acm->control->dev,
1442                                 &dev_attr_wCountryCodes);
1443                 device_remove_file(&acm->control->dev,
1444                                 &dev_attr_iCountryCodeRelDate);
1445         }
1446         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1447 alloc_fail7:
1448         usb_set_intfdata(intf, NULL);
1449         for (i = 0; i < ACM_NW; i++)
1450                 usb_free_urb(acm->wb[i].urb);
1451 alloc_fail6:
1452         for (i = 0; i < num_rx_buf; i++)
1453                 usb_free_urb(acm->read_urbs[i]);
1454         acm_read_buffers_free(acm);
1455         usb_free_urb(acm->ctrlurb);
1456 alloc_fail5:
1457         acm_write_buffers_free(acm);
1458 alloc_fail4:
1459         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1460 alloc_fail2:
1461         acm_release_minor(acm);
1462         kfree(acm);
1463 alloc_fail:
1464         return rv;
1465 }
1466
1467 static void stop_data_traffic(struct acm *acm)
1468 {
1469         int i;
1470
1471         dev_dbg(&acm->control->dev, "%s\n", __func__);
1472
1473         usb_kill_urb(acm->ctrlurb);
1474         for (i = 0; i < ACM_NW; i++)
1475                 usb_kill_urb(acm->wb[i].urb);
1476         for (i = 0; i < acm->rx_buflimit; i++)
1477                 usb_kill_urb(acm->read_urbs[i]);
1478
1479         cancel_work_sync(&acm->work);
1480 }
1481
1482 static void acm_disconnect(struct usb_interface *intf)
1483 {
1484         struct acm *acm = usb_get_intfdata(intf);
1485         struct usb_device *usb_dev = interface_to_usbdev(intf);
1486         struct tty_struct *tty;
1487         int i;
1488
1489         dev_dbg(&intf->dev, "%s\n", __func__);
1490
1491         /* sibling interface is already cleaning up */
1492         if (!acm)
1493                 return;
1494
1495         mutex_lock(&acm->mutex);
1496         acm->disconnected = true;
1497         if (acm->country_codes) {
1498                 device_remove_file(&acm->control->dev,
1499                                 &dev_attr_wCountryCodes);
1500                 device_remove_file(&acm->control->dev,
1501                                 &dev_attr_iCountryCodeRelDate);
1502         }
1503         wake_up_all(&acm->wioctl);
1504         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1505         usb_set_intfdata(acm->control, NULL);
1506         usb_set_intfdata(acm->data, NULL);
1507         mutex_unlock(&acm->mutex);
1508
1509         tty = tty_port_tty_get(&acm->port);
1510         if (tty) {
1511                 tty_vhangup(tty);
1512                 tty_kref_put(tty);
1513         }
1514
1515         stop_data_traffic(acm);
1516
1517         tty_unregister_device(acm_tty_driver, acm->minor);
1518
1519         usb_free_urb(acm->ctrlurb);
1520         for (i = 0; i < ACM_NW; i++)
1521                 usb_free_urb(acm->wb[i].urb);
1522         for (i = 0; i < acm->rx_buflimit; i++)
1523                 usb_free_urb(acm->read_urbs[i]);
1524         acm_write_buffers_free(acm);
1525         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1526         acm_read_buffers_free(acm);
1527
1528         if (!acm->combined_interfaces)
1529                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1530                                         acm->data : acm->control);
1531
1532         tty_port_put(&acm->port);
1533 }
1534
1535 #ifdef CONFIG_PM
1536 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1537 {
1538         struct acm *acm = usb_get_intfdata(intf);
1539         int cnt;
1540
1541         spin_lock_irq(&acm->read_lock);
1542         spin_lock(&acm->write_lock);
1543         if (PMSG_IS_AUTO(message)) {
1544                 if (acm->transmitting) {
1545                         spin_unlock(&acm->write_lock);
1546                         spin_unlock_irq(&acm->read_lock);
1547                         return -EBUSY;
1548                 }
1549         }
1550         cnt = acm->susp_count++;
1551         spin_unlock(&acm->write_lock);
1552         spin_unlock_irq(&acm->read_lock);
1553
1554         if (cnt)
1555                 return 0;
1556
1557         stop_data_traffic(acm);
1558
1559         return 0;
1560 }
1561
1562 static int acm_resume(struct usb_interface *intf)
1563 {
1564         struct acm *acm = usb_get_intfdata(intf);
1565         struct urb *urb;
1566         int rv = 0;
1567
1568         spin_lock_irq(&acm->read_lock);
1569         spin_lock(&acm->write_lock);
1570
1571         if (--acm->susp_count)
1572                 goto out;
1573
1574         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1575                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1576
1577                 for (;;) {
1578                         urb = usb_get_from_anchor(&acm->delayed);
1579                         if (!urb)
1580                                 break;
1581
1582                         acm_start_wb(acm, urb->context);
1583                 }
1584
1585                 /*
1586                  * delayed error checking because we must
1587                  * do the write path at all cost
1588                  */
1589                 if (rv < 0)
1590                         goto out;
1591
1592                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1593         }
1594 out:
1595         spin_unlock(&acm->write_lock);
1596         spin_unlock_irq(&acm->read_lock);
1597
1598         return rv;
1599 }
1600
1601 static int acm_reset_resume(struct usb_interface *intf)
1602 {
1603         struct acm *acm = usb_get_intfdata(intf);
1604
1605         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1606                 tty_port_tty_hangup(&acm->port, false);
1607
1608         return acm_resume(intf);
1609 }
1610
1611 #endif /* CONFIG_PM */
1612
1613 #define NOKIA_PCSUITE_ACM_INFO(x) \
1614                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1615                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1616                 USB_CDC_ACM_PROTO_VENDOR)
1617
1618 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1619                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1620                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1621                 USB_CDC_ACM_PROTO_VENDOR)
1622
1623 /*
1624  * USB driver structure.
1625  */
1626
1627 static const struct usb_device_id acm_ids[] = {
1628         /* quirky and broken devices */
1629         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1630         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1631         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1632         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1633         },
1634         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1635         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1636         },
1637         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1638         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1639         },
1640         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1641         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1642         },
1643         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1644         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1645         },
1646         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1647         .driver_info = SINGLE_RX_URB,
1648         },
1649         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1650         .driver_info = SINGLE_RX_URB, /* firmware bug */
1651         },
1652         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1653         .driver_info = SINGLE_RX_URB, /* firmware bug */
1654         },
1655         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1656         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1657         },
1658         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1659         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1660         },
1661         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1662         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1663         },
1664         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1665         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1666         },
1667         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1668         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1669         },
1670         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1671         },
1672         /* Motorola H24 HSPA module: */
1673         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1674         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1675         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1676         },
1677         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1678         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1679         },
1680         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1681         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1682         },
1683         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1684         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1685         },
1686         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1687         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1688         },
1689         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1690         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1691         },
1692         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1693         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1694         },
1695
1696         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1697         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1698                                            data interface instead of
1699                                            communications interface.
1700                                            Maybe we should define a new
1701                                            quirk for this. */
1702         },
1703         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1704         .driver_info = NO_UNION_NORMAL,
1705         },
1706         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1707         .driver_info = NO_UNION_NORMAL,
1708         },
1709         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1710         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1711         },
1712         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1713         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1714         },
1715
1716         /* Nokia S60 phones expose two ACM channels. The first is
1717          * a modem and is picked up by the standard AT-command
1718          * information below. The second is 'vendor-specific' but
1719          * is treated as a serial device at the S60 end, so we want
1720          * to expose it on Linux too. */
1721         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1722         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1723         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1724         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1725         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1726         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1727         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1728         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1729         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1730         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1731         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1732         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1733         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1734         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1735         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1736         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1737         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1738         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1739         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1740         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1741         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1742         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1743         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1744         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1745         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1746         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1747         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1748         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1749         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1750         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1751         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1752         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1753         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1754         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1755         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1756         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1757         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1758         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1759         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1760         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1761         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1762         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1763         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1764         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1765         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1766         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1767         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1768         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1769         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1770         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1771         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1772         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1773         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1774         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1775         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1776         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1777         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1778         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1779
1780         /* Support for Owen devices */
1781         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1782
1783         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1784
1785         /* Support Lego NXT using pbLua firmware */
1786         { USB_DEVICE(0x0694, 0xff00),
1787         .driver_info = NOT_A_MODEM,
1788         },
1789
1790         /* Support for Droids MuIn LCD */
1791         { USB_DEVICE(0x04d8, 0x000b),
1792         .driver_info = NO_DATA_INTERFACE,
1793         },
1794
1795 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1796         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1797         .driver_info = IGNORE_DEVICE,
1798         },
1799         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1800         .driver_info = IGNORE_DEVICE,
1801         },
1802 #endif
1803
1804         /* control interfaces without any protocol set */
1805         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1806                 USB_CDC_PROTO_NONE) },
1807
1808         /* control interfaces with various AT-command sets */
1809         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1810                 USB_CDC_ACM_PROTO_AT_V25TER) },
1811         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1812                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1813         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1814                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1815         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1816                 USB_CDC_ACM_PROTO_AT_GSM) },
1817         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1818                 USB_CDC_ACM_PROTO_AT_3G) },
1819         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1820                 USB_CDC_ACM_PROTO_AT_CDMA) },
1821
1822         { }
1823 };
1824
1825 MODULE_DEVICE_TABLE(usb, acm_ids);
1826
1827 static struct usb_driver acm_driver = {
1828         .name =         "cdc_acm",
1829         .probe =        acm_probe,
1830         .disconnect =   acm_disconnect,
1831 #ifdef CONFIG_PM
1832         .suspend =      acm_suspend,
1833         .resume =       acm_resume,
1834         .reset_resume = acm_reset_resume,
1835 #endif
1836         .id_table =     acm_ids,
1837 #ifdef CONFIG_PM
1838         .supports_autosuspend = 1,
1839 #endif
1840         .disable_hub_initiated_lpm = 1,
1841 };
1842
1843 /*
1844  * TTY driver structures.
1845  */
1846
1847 static const struct tty_operations acm_ops = {
1848         .install =              acm_tty_install,
1849         .open =                 acm_tty_open,
1850         .close =                acm_tty_close,
1851         .cleanup =              acm_tty_cleanup,
1852         .hangup =               acm_tty_hangup,
1853         .write =                acm_tty_write,
1854         .write_room =           acm_tty_write_room,
1855         .ioctl =                acm_tty_ioctl,
1856         .throttle =             acm_tty_throttle,
1857         .unthrottle =           acm_tty_unthrottle,
1858         .chars_in_buffer =      acm_tty_chars_in_buffer,
1859         .break_ctl =            acm_tty_break_ctl,
1860         .set_termios =          acm_tty_set_termios,
1861         .tiocmget =             acm_tty_tiocmget,
1862         .tiocmset =             acm_tty_tiocmset,
1863 };
1864
1865 /*
1866  * Init / exit.
1867  */
1868
1869 static int __init acm_init(void)
1870 {
1871         int retval;
1872         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1873         if (!acm_tty_driver)
1874                 return -ENOMEM;
1875         acm_tty_driver->driver_name = "acm",
1876         acm_tty_driver->name = "ttyACM",
1877         acm_tty_driver->major = ACM_TTY_MAJOR,
1878         acm_tty_driver->minor_start = 0,
1879         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1880         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1881         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1882         acm_tty_driver->init_termios = tty_std_termios;
1883         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1884                                                                 HUPCL | CLOCAL;
1885         tty_set_operations(acm_tty_driver, &acm_ops);
1886
1887         retval = tty_register_driver(acm_tty_driver);
1888         if (retval) {
1889                 put_tty_driver(acm_tty_driver);
1890                 return retval;
1891         }
1892
1893         retval = usb_register(&acm_driver);
1894         if (retval) {
1895                 tty_unregister_driver(acm_tty_driver);
1896                 put_tty_driver(acm_tty_driver);
1897                 return retval;
1898         }
1899
1900         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1901
1902         return 0;
1903 }
1904
1905 static void __exit acm_exit(void)
1906 {
1907         usb_deregister(&acm_driver);
1908         tty_unregister_driver(acm_tty_driver);
1909         put_tty_driver(acm_tty_driver);
1910 }
1911
1912 module_init(acm_init);
1913 module_exit(acm_exit);
1914
1915 MODULE_AUTHOR(DRIVER_AUTHOR);
1916 MODULE_DESCRIPTION(DRIVER_DESC);
1917 MODULE_LICENSE("GPL");
1918 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);