drivers/usb/class/cdc-acm.c

   1 /*
   2  * cdc-acm.c
   3  *
   4  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
   5  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
   6  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
   7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   8  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
   9  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
  10  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
  11  *
  12  * USB Abstract Control Model driver for USB modems and ISDN adapters
  13  *
  14  * Sponsored by SuSE
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  29  */
  30
  31 #undef DEBUG
  32 #undef VERBOSE_DEBUG
  33
  34 #include <linux/kernel.h>
  35 #include <linux/errno.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/tty.h>
  39 #include <linux/serial.h>
  40 #include <linux/tty_driver.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/module.h>
  43 #include <linux/mutex.h>
  44 #include <linux/uaccess.h>
  45 #include <linux/usb.h>
  46 #include <linux/usb/cdc.h>
  47 #include <asm/byteorder.h>
  48 #include <asm/unaligned.h>
  49 #include <linux/idr.h>
  50 #include <linux/list.h>
  51
  52 #include "cdc-acm.h"
  53
  54
  55 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  56 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  57
  58 static struct usb_driver acm_driver;
  59 static struct tty_driver *acm_tty_driver;
  60
  61 static DEFINE_IDR(acm_minors);
  62 static DEFINE_MUTEX(acm_minors_lock);
  63
  64 static void acm_tty_set_termios(struct tty_struct *tty,
  65                                 struct ktermios *termios_old);
  66
  67 /*
  68  * acm_minors accessors
  69  */
  70
  71 /*
  72  * Look up an ACM structure by minor. If found and not disconnected, increment
  73  * its refcount and return it with its mutex held.
  74  */
  75 static struct acm *acm_get_by_minor(unsigned int minor)
  76 {
  77         struct acm *acm;
  78
  79         mutex_lock(&acm_minors_lock);
  80         acm = idr_find(&acm_minors, minor);
  81         if (acm) {
  82                 mutex_lock(&acm->mutex);
  83                 if (acm->disconnected) {
  84                         mutex_unlock(&acm->mutex);
  85                         acm = NULL;
  86                 } else {
  87                         tty_port_get(&acm->port);
  88                         mutex_unlock(&acm->mutex);
  89                 }
  90         }
  91         mutex_unlock(&acm_minors_lock);
  92         return acm;
  93 }
  94
  95 /*
  96  * Try to find an available minor number and if found, associate it with 'acm'.
  97  */
  98 static int acm_alloc_minor(struct acm *acm)
  99 {
 100         int minor;
 101
 102         mutex_lock(&acm_minors_lock);
 103         minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
 104         mutex_unlock(&acm_minors_lock);
 105
 106         return minor;
 107 }
 108
 109 /* Release the minor number associated with 'acm'.  */
 110 static void acm_release_minor(struct acm *acm)
 111 {
 112         mutex_lock(&acm_minors_lock);
 113         idr_remove(&acm_minors, acm->minor);
 114         mutex_unlock(&acm_minors_lock);
 115 }
 116
 117 /*
 118  * Functions for ACM control messages.
 119  */
 120
 121 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 122                                                         void *buf, int len)
 123 {
 124         int retval;
 125
 126         retval = usb_autopm_get_interface(acm->control);
 127         if (retval)
 128                 return retval;
 129
 130         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 131                 request, USB_RT_ACM, value,
 132                 acm->control->altsetting[0].desc.bInterfaceNumber,
 133                 buf, len, 5000);
 134
 135         dev_dbg(&acm->control->dev,
 136                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 137                         __func__, request, value, len, retval);
 138
 139         usb_autopm_put_interface(acm->control);
 140
 141         return retval < 0 ? retval : 0;
 142 }
 143
 144 /* devices aren't required to support these requests.
 145  * the cdc acm descriptor tells whether they do...
 146  */
 147 static inline int acm_set_control(struct acm *acm, int control)
 148 {
 149         if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
 150                 return -EOPNOTSUPP;
 151
 152         return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
 153                         control, NULL, 0);
 154 }
 155
 156 #define acm_set_line(acm, line) \
 157         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 158 #define acm_send_break(acm, ms) \
 159         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 160
 161 /*
 162  * Write buffer management.
 163  * All of these assume proper locks taken by the caller.
 164  */
 165
 166 static int acm_wb_alloc(struct acm *acm)
 167 {
 168         int i, wbn;
 169         struct acm_wb *wb;
 170
 171         wbn = 0;
 172         i = 0;
 173         for (;;) {
 174                 wb = &acm->wb[wbn];
 175                 if (!wb->use) {
 176                         wb->use = 1;
 177                         wb->len = 0;
 178                         return wbn;
 179                 }
 180                 wbn = (wbn + 1) % ACM_NW;
 181                 if (++i >= ACM_NW)
 182                         return -1;
 183         }
 184 }
 185
 186 static int acm_wb_is_avail(struct acm *acm)
 187 {
 188         int i, n;
 189         unsigned long flags;
 190
 191         n = ACM_NW;
 192         spin_lock_irqsave(&acm->write_lock, flags);
 193         for (i = 0; i < ACM_NW; i++)
 194                 n -= acm->wb[i].use;
 195         spin_unlock_irqrestore(&acm->write_lock, flags);
 196         return n;
 197 }
 198
 199 /*
 200  * Finish write. Caller must hold acm->write_lock
 201  */
 202 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 203 {
 204         wb->use = 0;
 205         acm->transmitting--;
 206         usb_autopm_put_interface_async(acm->control);
 207 }
 208
 209 /*
 210  * Poke write.
 211  *
 212  * the caller is responsible for locking
 213  */
 214
 215 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 216 {
 217         int rc;
 218
 219         acm->transmitting++;
 220
 221         wb->urb->transfer_buffer = wb->buf;
 222         wb->urb->transfer_dma = wb->dmah;
 223         wb->urb->transfer_buffer_length = wb->len;
 224         wb->urb->dev = acm->dev;
 225
 226         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 227         if (rc < 0) {
 228                 dev_err(&acm->data->dev,
 229                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 230                         __func__, rc);
 231                 acm_write_done(acm, wb);
 232         }
 233         return rc;
 234 }
 235
 236 /*
 237  * attributes exported through sysfs
 238  */
 239 static ssize_t show_caps
 240 (struct device *dev, struct device_attribute *attr, char *buf)
 241 {
 242         struct usb_interface *intf = to_usb_interface(dev);
 243         struct acm *acm = usb_get_intfdata(intf);
 244
 245         return sprintf(buf, "%d", acm->ctrl_caps);
 246 }
 247 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 248
 249 static ssize_t show_country_codes
 250 (struct device *dev, struct device_attribute *attr, char *buf)
 251 {
 252         struct usb_interface *intf = to_usb_interface(dev);
 253         struct acm *acm = usb_get_intfdata(intf);
 254
 255         memcpy(buf, acm->country_codes, acm->country_code_size);
 256         return acm->country_code_size;
 257 }
 258
 259 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 260
 261 static ssize_t show_country_rel_date
 262 (struct device *dev, struct device_attribute *attr, char *buf)
 263 {
 264         struct usb_interface *intf = to_usb_interface(dev);
 265         struct acm *acm = usb_get_intfdata(intf);
 266
 267         return sprintf(buf, "%d", acm->country_rel_date);
 268 }
 269
 270 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 271 /*
 272  * Interrupt handlers for various ACM device responses
 273  */
 274
 275 /* control interface reports status changes with "interrupt" transfers */
 276 static void acm_ctrl_irq(struct urb *urb)
 277 {
 278         struct acm *acm = urb->context;
 279         struct usb_cdc_notification *dr = urb->transfer_buffer;
 280         unsigned char *data;
 281         int newctrl;
 282         int difference;
 283         int retval;
 284         int status = urb->status;
 285
 286         switch (status) {
 287         case 0:
 288                 /* success */
 289                 break;
 290         case -ECONNRESET:
 291         case -ENOENT:
 292         case -ESHUTDOWN:
 293                 /* this urb is terminated, clean up */
 294                 dev_dbg(&acm->control->dev,
 295                                 "%s - urb shutting down with status: %d\n",
 296                                 __func__, status);
 297                 return;
 298         default:
 299                 dev_dbg(&acm->control->dev,
 300                                 "%s - nonzero urb status received: %d\n",
 301                                 __func__, status);
 302                 goto exit;
 303         }
 304
 305         usb_mark_last_busy(acm->dev);
 306
 307         data = (unsigned char *)(dr + 1);
 308         switch (dr->bNotificationType) {
 309         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 310                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
 311                                                         __func__, dr->wValue);
 312                 break;
 313
 314         case USB_CDC_NOTIFY_SERIAL_STATE:
 315                 if (le16_to_cpu(dr->wLength) != 2) {
 316                         dev_dbg(&acm->control->dev,
 317                                 "%s - malformed serial state\n", __func__);
 318                         break;
 319                 }
 320
 321                 newctrl = get_unaligned_le16(data);
 322
 323                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 324                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
 325                                         __func__);
 326                         tty_port_tty_hangup(&acm->port, false);
 327                 }
 328
 329                 difference = acm->ctrlin ^ newctrl;
 330                 spin_lock(&acm->read_lock);
 331                 acm->ctrlin = newctrl;
 332                 acm->oldcount = acm->iocount;
 333
 334                 if (difference & ACM_CTRL_DSR)
 335                         acm->iocount.dsr++;
 336                 if (difference & ACM_CTRL_DCD)
 337                         acm->iocount.dcd++;
 338                 if (newctrl & ACM_CTRL_BRK) {
 339                         acm->iocount.brk++;
 340                         tty_insert_flip_char(&acm->port, 0, TTY_BREAK);
 341                 }
 342                 if (newctrl & ACM_CTRL_RI)
 343                         acm->iocount.rng++;
 344                 if (newctrl & ACM_CTRL_FRAMING)
 345                         acm->iocount.frame++;
 346                 if (newctrl & ACM_CTRL_PARITY)
 347                         acm->iocount.parity++;
 348                 if (newctrl & ACM_CTRL_OVERRUN)
 349                         acm->iocount.overrun++;
 350                 spin_unlock(&acm->read_lock);
 351
 352                 if (newctrl & ACM_CTRL_BRK)
 353                         tty_flip_buffer_push(&acm->port);
 354
 355                 if (difference)
 356                         wake_up_all(&acm->wioctl);
 357
 358                 break;
 359
 360         default:
 361                 dev_dbg(&acm->control->dev,
 362                         "%s - unknown notification %d received: index %d len %d\n",
 363                         __func__,
 364                         dr->bNotificationType, dr->wIndex, dr->wLength);
 365
 366                 break;
 367         }
 368 exit:
 369         retval = usb_submit_urb(urb, GFP_ATOMIC);
 370         if (retval && retval != -EPERM)
 371                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 372                                                         __func__, retval);
 373 }
 374
 375 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 376 {
 377         int res;
 378
 379         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 380                 return 0;
 381
 382         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 383         if (res) {
 384                 if (res != -EPERM && res != -ENODEV) {
 385                         dev_err(&acm->data->dev,
 386                                         "urb %d failed submission with %d\n",
 387                                         index, res);
 388                 }
 389                 set_bit(index, &acm->read_urbs_free);
 390                 return res;
 391         } else {
 392                 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 393         }
 394
 395         return 0;
 396 }
 397
 398 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 399 {
 400         int res;
 401         int i;
 402
 403         for (i = 0; i < acm->rx_buflimit; ++i) {
 404                 res = acm_submit_read_urb(acm, i, mem_flags);
 405                 if (res)
 406                         return res;
 407         }
 408
 409         return 0;
 410 }
 411
 412 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 413 {
 414         unsigned long flags;
 415
 416         if (!urb->actual_length)
 417                 return;
 418
 419         spin_lock_irqsave(&acm->read_lock, flags);
 420         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 421                         urb->actual_length);
 422         spin_unlock_irqrestore(&acm->read_lock, flags);
 423
 424         tty_flip_buffer_push(&acm->port);
 425 }
 426
 427 static void acm_read_bulk_callback(struct urb *urb)
 428 {
 429         struct acm_rb *rb = urb->context;
 430         struct acm *acm = rb->instance;
 431         unsigned long flags;
 432         int status = urb->status;
 433
 434         dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 435                                         rb->index, urb->actual_length,
 436                                         status);
 437
 438         if (!acm->dev) {
 439                 set_bit(rb->index, &acm->read_urbs_free);
 440                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 441                 return;
 442         }
 443
 444         if (status) {
 445                 set_bit(rb->index, &acm->read_urbs_free);
 446                 if ((status != -ENOENT) || (urb->actual_length == 0))
 447                         return;
 448         }
 449
 450         usb_mark_last_busy(acm->dev);
 451
 452         acm_process_read_urb(acm, urb);
 453         /*
 454          * Unthrottle may run on another CPU which needs to see events
 455          * in the same order. Submission has an implict barrier
 456          */
 457         smp_mb__before_atomic();
 458         set_bit(rb->index, &acm->read_urbs_free);
 459
 460         /* throttle device if requested by tty */
 461         spin_lock_irqsave(&acm->read_lock, flags);
 462         acm->throttled = acm->throttle_req;
 463         if (!acm->throttled) {
 464                 spin_unlock_irqrestore(&acm->read_lock, flags);
 465                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 466         } else {
 467                 spin_unlock_irqrestore(&acm->read_lock, flags);
 468         }
 469 }
 470
 471 /* data interface wrote those outgoing bytes */
 472 static void acm_write_bulk(struct urb *urb)
 473 {
 474         struct acm_wb *wb = urb->context;
 475         struct acm *acm = wb->instance;
 476         unsigned long flags;
 477         int status = urb->status;
 478
 479         if (status || (urb->actual_length != urb->transfer_buffer_length))
 480                 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
 481                         urb->actual_length,
 482                         urb->transfer_buffer_length,
 483                         status);
 484
 485         spin_lock_irqsave(&acm->write_lock, flags);
 486         acm_write_done(acm, wb);
 487         spin_unlock_irqrestore(&acm->write_lock, flags);
 488         schedule_work(&acm->work);
 489 }
 490
 491 static void acm_softint(struct work_struct *work)
 492 {
 493         struct acm *acm = container_of(work, struct acm, work);
 494
 495         tty_port_tty_wakeup(&acm->port);
 496 }
 497
 498 /*
 499  * TTY handlers
 500  */
 501
 502 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 503 {
 504         struct acm *acm;
 505         int retval;
 506
 507         acm = acm_get_by_minor(tty->index);
 508         if (!acm)
 509                 return -ENODEV;
 510
 511         retval = tty_standard_install(driver, tty);
 512         if (retval)
 513                 goto error_init_termios;
 514
 515         /*
 516          * Suppress initial echoing for some devices which might send data
 517          * immediately after acm driver has been installed.
 518          */
 519         if (acm->quirks & DISABLE_ECHO)
 520                 tty->termios.c_lflag &= ~ECHO;
 521
 522         tty->driver_data = acm;
 523
 524         return 0;
 525
 526 error_init_termios:
 527         tty_port_put(&acm->port);
 528         return retval;
 529 }
 530
 531 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 532 {
 533         struct acm *acm = tty->driver_data;
 534
 535         return tty_port_open(&acm->port, tty, filp);
 536 }
 537
 538 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 539 {
 540         struct acm *acm = container_of(port, struct acm, port);
 541         int val;
 542         int res;
 543
 544         if (raise)
 545                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 546         else
 547                 val = 0;
 548
 549         /* FIXME: add missing ctrlout locking throughout driver */
 550         acm->ctrlout = val;
 551
 552         res = acm_set_control(acm, val);
 553         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 554                 /* This is broken in too many devices to spam the logs */
 555                 dev_dbg(&acm->control->dev, "failed to set dtr/rts\n");
 556 }
 557
 558 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 559 {
 560         struct acm *acm = container_of(port, struct acm, port);
 561         int retval = -ENODEV;
 562         int i;
 563
 564         mutex_lock(&acm->mutex);
 565         if (acm->disconnected)
 566                 goto disconnected;
 567
 568         retval = usb_autopm_get_interface(acm->control);
 569         if (retval)
 570                 goto error_get_interface;
 571
 572         /*
 573          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 574          * memory is really nasty...
 575          */
 576         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 577         acm->control->needs_remote_wakeup = 1;
 578
 579         acm->ctrlurb->dev = acm->dev;
 580         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 581         if (retval) {
 582                 dev_err(&acm->control->dev,
 583                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 584                 goto error_submit_urb;
 585         }
 586
 587         acm_tty_set_termios(tty, NULL);
 588
 589         /*
 590          * Unthrottle device in case the TTY was closed while throttled.
 591          */
 592         spin_lock_irq(&acm->read_lock);
 593         acm->throttled = 0;
 594         acm->throttle_req = 0;
 595         spin_unlock_irq(&acm->read_lock);
 596
 597         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 598         if (retval)
 599                 goto error_submit_read_urbs;
 600
 601         usb_autopm_put_interface(acm->control);
 602
 603         mutex_unlock(&acm->mutex);
 604
 605         return 0;
 606
 607 error_submit_read_urbs:
 608         for (i = 0; i < acm->rx_buflimit; i++)
 609                 usb_kill_urb(acm->read_urbs[i]);
 610         usb_kill_urb(acm->ctrlurb);
 611 error_submit_urb:
 612         usb_autopm_put_interface(acm->control);
 613 error_get_interface:
 614 disconnected:
 615         mutex_unlock(&acm->mutex);
 616
 617         return usb_translate_errors(retval);
 618 }
 619
 620 static void acm_port_destruct(struct tty_port *port)
 621 {
 622         struct acm *acm = container_of(port, struct acm, port);
 623
 624         acm_release_minor(acm);
 625         usb_put_intf(acm->control);
 626         kfree(acm->country_codes);
 627         kfree(acm);
 628 }
 629
 630 static void acm_port_shutdown(struct tty_port *port)
 631 {
 632         struct acm *acm = container_of(port, struct acm, port);
 633         struct urb *urb;
 634         struct acm_wb *wb;
 635         int i;
 636
 637         /*
 638          * Need to grab write_lock to prevent race with resume, but no need to
 639          * hold it due to the tty-port initialised flag.
 640          */
 641         spin_lock_irq(&acm->write_lock);
 642         spin_unlock_irq(&acm->write_lock);
 643
 644         usb_autopm_get_interface_no_resume(acm->control);
 645         acm->control->needs_remote_wakeup = 0;
 646         usb_autopm_put_interface(acm->control);
 647
 648         for (;;) {
 649                 urb = usb_get_from_anchor(&acm->delayed);
 650                 if (!urb)
 651                         break;
 652                 wb = urb->context;
 653                 wb->use = 0;
 654                 usb_autopm_put_interface_async(acm->control);
 655         }
 656
 657         usb_kill_urb(acm->ctrlurb);
 658         for (i = 0; i < ACM_NW; i++)
 659                 usb_kill_urb(acm->wb[i].urb);
 660         for (i = 0; i < acm->rx_buflimit; i++)
 661                 usb_kill_urb(acm->read_urbs[i]);
 662 }
 663
 664 static void acm_tty_cleanup(struct tty_struct *tty)
 665 {
 666         struct acm *acm = tty->driver_data;
 667
 668         tty_port_put(&acm->port);
 669 }
 670
 671 static void acm_tty_hangup(struct tty_struct *tty)
 672 {
 673         struct acm *acm = tty->driver_data;
 674
 675         tty_port_hangup(&acm->port);
 676 }
 677
 678 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 679 {
 680         struct acm *acm = tty->driver_data;
 681
 682         tty_port_close(&acm->port, tty, filp);
 683 }
 684
 685 static int acm_tty_write(struct tty_struct *tty,
 686                                         const unsigned char *buf, int count)
 687 {
 688         struct acm *acm = tty->driver_data;
 689         int stat;
 690         unsigned long flags;
 691         int wbn;
 692         struct acm_wb *wb;
 693
 694         if (!count)
 695                 return 0;
 696
 697         dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
 698
 699         spin_lock_irqsave(&acm->write_lock, flags);
 700         wbn = acm_wb_alloc(acm);
 701         if (wbn < 0) {
 702                 spin_unlock_irqrestore(&acm->write_lock, flags);
 703                 return 0;
 704         }
 705         wb = &acm->wb[wbn];
 706
 707         if (!acm->dev) {
 708                 wb->use = 0;
 709                 spin_unlock_irqrestore(&acm->write_lock, flags);
 710                 return -ENODEV;
 711         }
 712
 713         count = (count > acm->writesize) ? acm->writesize : count;
 714         dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
 715         memcpy(wb->buf, buf, count);
 716         wb->len = count;
 717
 718         stat = usb_autopm_get_interface_async(acm->control);
 719         if (stat) {
 720                 wb->use = 0;
 721                 spin_unlock_irqrestore(&acm->write_lock, flags);
 722                 return stat;
 723         }
 724
 725         if (acm->susp_count) {
 726                 usb_anchor_urb(wb->urb, &acm->delayed);
 727                 spin_unlock_irqrestore(&acm->write_lock, flags);
 728                 return count;
 729         }
 730
 731         stat = acm_start_wb(acm, wb);
 732         spin_unlock_irqrestore(&acm->write_lock, flags);
 733
 734         if (stat < 0)
 735                 return stat;
 736         return count;
 737 }
 738
 739 static int acm_tty_write_room(struct tty_struct *tty)
 740 {
 741         struct acm *acm = tty->driver_data;
 742         /*
 743          * Do not let the line discipline to know that we have a reserve,
 744          * or it might get too enthusiastic.
 745          */
 746         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 747 }
 748
 749 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 750 {
 751         struct acm *acm = tty->driver_data;
 752         /*
 753          * if the device was unplugged then any remaining characters fell out
 754          * of the connector ;)
 755          */
 756         if (acm->disconnected)
 757                 return 0;
 758         /*
 759          * This is inaccurate (overcounts), but it works.
 760          */
 761         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 762 }
 763
 764 static void acm_tty_throttle(struct tty_struct *tty)
 765 {
 766         struct acm *acm = tty->driver_data;
 767
 768         spin_lock_irq(&acm->read_lock);
 769         acm->throttle_req = 1;
 770         spin_unlock_irq(&acm->read_lock);
 771 }
 772
 773 static void acm_tty_unthrottle(struct tty_struct *tty)
 774 {
 775         struct acm *acm = tty->driver_data;
 776         unsigned int was_throttled;
 777
 778         spin_lock_irq(&acm->read_lock);
 779         was_throttled = acm->throttled;
 780         acm->throttled = 0;
 781         acm->throttle_req = 0;
 782         spin_unlock_irq(&acm->read_lock);
 783
 784         if (was_throttled)
 785                 acm_submit_read_urbs(acm, GFP_KERNEL);
 786 }
 787
 788 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 789 {
 790         struct acm *acm = tty->driver_data;
 791         int retval;
 792
 793         retval = acm_send_break(acm, state ? 0xffff : 0);
 794         if (retval < 0)
 795                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 796                                                                 __func__);
 797         return retval;
 798 }
 799
 800 static int acm_tty_tiocmget(struct tty_struct *tty)
 801 {
 802         struct acm *acm = tty->driver_data;
 803
 804         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 805                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 806                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 807                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 808                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 809                TIOCM_CTS;
 810 }
 811
 812 static int acm_tty_tiocmset(struct tty_struct *tty,
 813                             unsigned int set, unsigned int clear)
 814 {
 815         struct acm *acm = tty->driver_data;
 816         unsigned int newctrl;
 817
 818         newctrl = acm->ctrlout;
 819         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 820                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 821         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 822                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 823
 824         newctrl = (newctrl & ~clear) | set;
 825
 826         if (acm->ctrlout == newctrl)
 827                 return 0;
 828         return acm_set_control(acm, acm->ctrlout = newctrl);
 829 }
 830
 831 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 832 {
 833         struct serial_struct tmp;
 834
 835         if (!info)
 836                 return -EINVAL;
 837
 838         memset(&tmp, 0, sizeof(tmp));
 839         tmp.flags = ASYNC_LOW_LATENCY;
 840         tmp.xmit_fifo_size = acm->writesize;
 841         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 842         tmp.close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
 843         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 844                                 ASYNC_CLOSING_WAIT_NONE :
 845                                 jiffies_to_msecs(acm->port.closing_wait) / 10;
 846
 847         if (copy_to_user(info, &tmp, sizeof(tmp)))
 848                 return -EFAULT;
 849         else
 850                 return 0;
 851 }
 852
 853 static int set_serial_info(struct acm *acm,
 854                                 struct serial_struct __user *newinfo)
 855 {
 856         struct serial_struct new_serial;
 857         unsigned int closing_wait, close_delay;
 858         unsigned int old_closing_wait, old_close_delay;
 859         int retval = 0;
 860
 861         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 862                 return -EFAULT;
 863
 864         close_delay = msecs_to_jiffies(new_serial.close_delay * 10);
 865         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 866                         ASYNC_CLOSING_WAIT_NONE :
 867                         msecs_to_jiffies(new_serial.closing_wait * 10);
 868
 869         /* we must redo the rounding here, so that the values match */
 870         old_close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
 871         old_closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 872                                 ASYNC_CLOSING_WAIT_NONE :
 873                                 jiffies_to_msecs(acm->port.closing_wait) / 10;
 874
 875         mutex_lock(&acm->port.mutex);
 876
 877         if (!capable(CAP_SYS_ADMIN)) {
 878                 if ((new_serial.close_delay != old_close_delay) ||
 879                     (new_serial.closing_wait != old_closing_wait))
 880                         retval = -EPERM;
 881         } else {
 882                 acm->port.close_delay  = close_delay;
 883                 acm->port.closing_wait = closing_wait;
 884         }
 885
 886         mutex_unlock(&acm->port.mutex);
 887         return retval;
 888 }
 889
 890 static int wait_serial_change(struct acm *acm, unsigned long arg)
 891 {
 892         int rv = 0;
 893         DECLARE_WAITQUEUE(wait, current);
 894         struct async_icount old, new;
 895
 896         do {
 897                 spin_lock_irq(&acm->read_lock);
 898                 old = acm->oldcount;
 899                 new = acm->iocount;
 900                 acm->oldcount = new;
 901                 spin_unlock_irq(&acm->read_lock);
 902
 903                 if ((arg & TIOCM_DSR) &&
 904                         old.dsr != new.dsr)
 905                         break;
 906                 if ((arg & TIOCM_CD)  &&
 907                         old.dcd != new.dcd)
 908                         break;
 909                 if ((arg & TIOCM_RI) &&
 910                         old.rng != new.rng)
 911                         break;
 912
 913                 add_wait_queue(&acm->wioctl, &wait);
 914                 set_current_state(TASK_INTERRUPTIBLE);
 915                 schedule();
 916                 remove_wait_queue(&acm->wioctl, &wait);
 917                 if (acm->disconnected) {
 918                         if (arg & TIOCM_CD)
 919                                 break;
 920                         else
 921                                 rv = -ENODEV;
 922                 } else {
 923                         if (signal_pending(current))
 924                                 rv = -ERESTARTSYS;
 925                 }
 926         } while (!rv);
 927
 928
 929
 930         return rv;
 931 }
 932
 933 static int get_serial_usage(struct acm *acm,
 934                             struct serial_icounter_struct __user *count)
 935 {
 936         struct serial_icounter_struct icount;
 937         int rv = 0;
 938
 939         memset(&icount, 0, sizeof(icount));
 940         icount.dsr = acm->iocount.dsr;
 941         icount.rng = acm->iocount.rng;
 942         icount.dcd = acm->iocount.dcd;
 943         icount.frame = acm->iocount.frame;
 944         icount.overrun = acm->iocount.overrun;
 945         icount.parity = acm->iocount.parity;
 946         icount.brk = acm->iocount.brk;
 947
 948         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 949                 rv = -EFAULT;
 950
 951         return rv;
 952 }
 953
 954 static int acm_tty_ioctl(struct tty_struct *tty,
 955                                         unsigned int cmd, unsigned long arg)
 956 {
 957         struct acm *acm = tty->driver_data;
 958         int rv = -ENOIOCTLCMD;
 959
 960         switch (cmd) {
 961         case TIOCGSERIAL: /* gets serial port data */
 962                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 963                 break;
 964         case TIOCSSERIAL:
 965                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 966                 break;
 967         case TIOCMIWAIT:
 968                 rv = usb_autopm_get_interface(acm->control);
 969                 if (rv < 0) {
 970                         rv = -EIO;
 971                         break;
 972                 }
 973                 rv = wait_serial_change(acm, arg);
 974                 usb_autopm_put_interface(acm->control);
 975                 break;
 976         case TIOCGICOUNT:
 977                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
 978                 break;
 979         }
 980
 981         return rv;
 982 }
 983
 984 static void acm_tty_set_termios(struct tty_struct *tty,
 985                                                 struct ktermios *termios_old)
 986 {
 987         struct acm *acm = tty->driver_data;
 988         struct ktermios *termios = &tty->termios;
 989         struct usb_cdc_line_coding newline;
 990         int newctrl = acm->ctrlout;
 991
 992         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 993         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 994         newline.bParityType = termios->c_cflag & PARENB ?
 995                                 (termios->c_cflag & PARODD ? 1 : 2) +
 996                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 997         switch (termios->c_cflag & CSIZE) {
 998         case CS5:
 999                 newline.bDataBits = 5;
1000                 break;
1001         case CS6:
1002                 newline.bDataBits = 6;
1003                 break;
1004         case CS7:
1005                 newline.bDataBits = 7;
1006                 break;
1007         case CS8:
1008         default:
1009                 newline.bDataBits = 8;
1010                 break;
1011         }
1012         /* FIXME: Needs to clear unsupported bits in the termios */
1013         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1014
1015         if (C_BAUD(tty) == B0) {
1016                 newline.dwDTERate = acm->line.dwDTERate;
1017                 newctrl &= ~ACM_CTRL_DTR;
1018         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1019                 newctrl |=  ACM_CTRL_DTR;
1020         }
1021
1022         if (newctrl != acm->ctrlout)
1023                 acm_set_control(acm, acm->ctrlout = newctrl);
1024
1025         if (memcmp(&acm->line, &newline, sizeof newline)) {
1026                 memcpy(&acm->line, &newline, sizeof newline);
1027                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1028                         __func__,
1029                         le32_to_cpu(newline.dwDTERate),
1030                         newline.bCharFormat, newline.bParityType,
1031                         newline.bDataBits);
1032                 acm_set_line(acm, &acm->line);
1033         }
1034 }
1035
1036 static const struct tty_port_operations acm_port_ops = {
1037         .dtr_rts = acm_port_dtr_rts,
1038         .shutdown = acm_port_shutdown,
1039         .activate = acm_port_activate,
1040         .destruct = acm_port_destruct,
1041 };
1042
1043 /*
1044  * USB probe and disconnect routines.
1045  */
1046
1047 /* Little helpers: write/read buffers free */
1048 static void acm_write_buffers_free(struct acm *acm)
1049 {
1050         int i;
1051         struct acm_wb *wb;
1052         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1053
1054         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1055                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1056 }
1057
1058 static void acm_read_buffers_free(struct acm *acm)
1059 {
1060         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1061         int i;
1062
1063         for (i = 0; i < acm->rx_buflimit; i++)
1064                 usb_free_coherent(usb_dev, acm->readsize,
1065                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1066 }
1067
1068 /* Little helper: write buffers allocate */
1069 static int acm_write_buffers_alloc(struct acm *acm)
1070 {
1071         int i;
1072         struct acm_wb *wb;
1073
1074         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1075                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1076                     &wb->dmah);
1077                 if (!wb->buf) {
1078                         while (i != 0) {
1079                                 --i;
1080                                 --wb;
1081                                 usb_free_coherent(acm->dev, acm->writesize,
1082                                     wb->buf, wb->dmah);
1083                         }
1084                         return -ENOMEM;
1085                 }
1086         }
1087         return 0;
1088 }
1089
1090 static int acm_probe(struct usb_interface *intf,
1091                      const struct usb_device_id *id)
1092 {
1093         struct usb_cdc_union_desc *union_header = NULL;
1094         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1095         unsigned char *buffer = intf->altsetting->extra;
1096         int buflen = intf->altsetting->extralen;
1097         struct usb_interface *control_interface;
1098         struct usb_interface *data_interface;
1099         struct usb_endpoint_descriptor *epctrl = NULL;
1100         struct usb_endpoint_descriptor *epread = NULL;
1101         struct usb_endpoint_descriptor *epwrite = NULL;
1102         struct usb_device *usb_dev = interface_to_usbdev(intf);
1103         struct usb_cdc_parsed_header h;
1104         struct acm *acm;
1105         int minor;
1106         int ctrlsize, readsize;
1107         u8 *buf;
1108         int call_intf_num = -1;
1109         int data_intf_num = -1;
1110         unsigned long quirks;
1111         int num_rx_buf;
1112         int i;
1113         int combined_interfaces = 0;
1114         struct device *tty_dev;
1115         int rv = -ENOMEM;
1116
1117         /* normal quirks */
1118         quirks = (unsigned long)id->driver_info;
1119
1120         if (quirks == IGNORE_DEVICE)
1121                 return -ENODEV;
1122
1123         memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1124
1125         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1126
1127         /* handle quirks deadly to normal probing*/
1128         if (quirks == NO_UNION_NORMAL) {
1129                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1130                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1131                 /* we would crash */
1132                 if (!data_interface || !control_interface)
1133                         return -ENODEV;
1134                 goto skip_normal_probe;
1135         }
1136
1137         /* normal probing*/
1138         if (!buffer) {
1139                 dev_err(&intf->dev, "Weird descriptor references\n");
1140                 return -EINVAL;
1141         }
1142
1143         if (!intf->cur_altsetting)
1144                 return -EINVAL;
1145
1146         if (!buflen) {
1147                 if (intf->cur_altsetting->endpoint &&
1148                                 intf->cur_altsetting->endpoint->extralen &&
1149                                 intf->cur_altsetting->endpoint->extra) {
1150                         dev_dbg(&intf->dev,
1151                                 "Seeking extra descriptors on endpoint\n");
1152                         buflen = intf->cur_altsetting->endpoint->extralen;
1153                         buffer = intf->cur_altsetting->endpoint->extra;
1154                 } else {
1155                         dev_err(&intf->dev,
1156                                 "Zero length descriptor references\n");
1157                         return -EINVAL;
1158                 }
1159         }
1160
1161         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1162         union_header = h.usb_cdc_union_desc;
1163         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1164         if (cmgmd)
1165                 call_intf_num = cmgmd->bDataInterface;
1166
1167         if (!union_header) {
1168                 if (call_intf_num > 0) {
1169                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1170                         /* quirks for Droids MuIn LCD */
1171                         if (quirks & NO_DATA_INTERFACE) {
1172                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1173                         } else {
1174                                 data_intf_num = call_intf_num;
1175                                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1176                         }
1177                         control_interface = intf;
1178                 } else {
1179                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1180                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1181                                 return -ENODEV;
1182                         } else {
1183                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1184                                 combined_interfaces = 1;
1185                                 control_interface = data_interface = intf;
1186                                 goto look_for_collapsed_interface;
1187                         }
1188                 }
1189         } else {
1190                 int class = -1;
1191
1192                 data_intf_num = union_header->bSlaveInterface0;
1193                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1194                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1195
1196                 if (control_interface)
1197                         class = control_interface->cur_altsetting->desc.bInterfaceClass;
1198
1199                 if (class != USB_CLASS_COMM && class != USB_CLASS_CDC_DATA) {
1200                         dev_dbg(&intf->dev, "Broken union descriptor, assuming single interface\n");
1201                         combined_interfaces = 1;
1202                         control_interface = data_interface = intf;
1203                         goto look_for_collapsed_interface;
1204                 }
1205         }
1206
1207         if (!control_interface || !data_interface) {
1208                 dev_dbg(&intf->dev, "no interfaces\n");
1209                 return -ENODEV;
1210         }
1211         if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1212                 return -ENODEV;
1213
1214         if (data_intf_num != call_intf_num)
1215                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1216
1217         if (control_interface == data_interface) {
1218                 /* some broken devices designed for windows work this way */
1219                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1220                 combined_interfaces = 1;
1221                 /* a popular other OS doesn't use it */
1222                 quirks |= NO_CAP_LINE;
1223                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1224                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1225                         return -EINVAL;
1226                 }
1227 look_for_collapsed_interface:
1228                 for (i = 0; i < 3; i++) {
1229                         struct usb_endpoint_descriptor *ep;
1230                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1231
1232                         if (usb_endpoint_is_int_in(ep))
1233                                 epctrl = ep;
1234                         else if (usb_endpoint_is_bulk_out(ep))
1235                                 epwrite = ep;
1236                         else if (usb_endpoint_is_bulk_in(ep))
1237                                 epread = ep;
1238                         else
1239                                 return -EINVAL;
1240                 }
1241                 if (!epctrl || !epread || !epwrite)
1242                         return -ENODEV;
1243                 else
1244                         goto made_compressed_probe;
1245         }
1246
1247 skip_normal_probe:
1248
1249         /*workaround for switched interfaces */
1250         if (data_interface->cur_altsetting->desc.bInterfaceClass
1251                                                 != CDC_DATA_INTERFACE_TYPE) {
1252                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1253                                                 == CDC_DATA_INTERFACE_TYPE) {
1254                         dev_dbg(&intf->dev,
1255                                 "Your device has switched interfaces.\n");
1256                         swap(control_interface, data_interface);
1257                 } else {
1258                         return -EINVAL;
1259                 }
1260         }
1261
1262         /* Accept probe requests only for the control interface */
1263         if (!combined_interfaces && intf != control_interface)
1264                 return -ENODEV;
1265
1266         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1267                 /* valid in this context */
1268                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1269                 return -EBUSY;
1270         }
1271
1272
1273         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1274             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1275                 return -EINVAL;
1276
1277         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1278         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1279         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1280
1281
1282         /* workaround for switched endpoints */
1283         if (!usb_endpoint_dir_in(epread)) {
1284                 /* descriptors are swapped */
1285                 dev_dbg(&intf->dev,
1286                         "The data interface has switched endpoints\n");
1287                 swap(epread, epwrite);
1288         }
1289 made_compressed_probe:
1290         dev_dbg(&intf->dev, "interfaces are valid\n");
1291
1292         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1293         if (acm == NULL)
1294                 goto alloc_fail;
1295
1296         ctrlsize = usb_endpoint_maxp(epctrl);
1297         readsize = usb_endpoint_maxp(epread) *
1298                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1299         acm->combined_interfaces = combined_interfaces;
1300         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1301         acm->control = control_interface;
1302         acm->data = data_interface;
1303
1304         usb_get_intf(acm->control); /* undone in destruct() */
1305
1306         minor = acm_alloc_minor(acm);
1307         if (minor < 0)
1308                 goto alloc_fail1;
1309
1310         acm->minor = minor;
1311         acm->dev = usb_dev;
1312         if (h.usb_cdc_acm_descriptor)
1313                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1314         if (quirks & NO_CAP_LINE)
1315                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1316         acm->ctrlsize = ctrlsize;
1317         acm->readsize = readsize;
1318         acm->rx_buflimit = num_rx_buf;
1319         INIT_WORK(&acm->work, acm_softint);
1320         init_waitqueue_head(&acm->wioctl);
1321         spin_lock_init(&acm->write_lock);
1322         spin_lock_init(&acm->read_lock);
1323         mutex_init(&acm->mutex);
1324         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1325         if (acm->is_int_ep)
1326                 acm->bInterval = epread->bInterval;
1327         tty_port_init(&acm->port);
1328         acm->port.ops = &acm_port_ops;
1329         init_usb_anchor(&acm->delayed);
1330         acm->quirks = quirks;
1331
1332         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1333         if (!buf)
1334                 goto alloc_fail2;
1335         acm->ctrl_buffer = buf;
1336
1337         if (acm_write_buffers_alloc(acm) < 0)
1338                 goto alloc_fail4;
1339
1340         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1341         if (!acm->ctrlurb)
1342                 goto alloc_fail5;
1343
1344         for (i = 0; i < num_rx_buf; i++) {
1345                 struct acm_rb *rb = &(acm->read_buffers[i]);
1346                 struct urb *urb;
1347
1348                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1349                                                                 &rb->dma);
1350                 if (!rb->base)
1351                         goto alloc_fail6;
1352                 rb->index = i;
1353                 rb->instance = acm;
1354
1355                 urb = usb_alloc_urb(0, GFP_KERNEL);
1356                 if (!urb)
1357                         goto alloc_fail6;
1358
1359                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1360                 urb->transfer_dma = rb->dma;
1361                 if (acm->is_int_ep) {
1362                         usb_fill_int_urb(urb, acm->dev,
1363                                          usb_rcvintpipe(usb_dev, epread->bEndpointAddress),
1364                                          rb->base,
1365                                          acm->readsize,
1366                                          acm_read_bulk_callback, rb,
1367                                          acm->bInterval);
1368                 } else {
1369                         usb_fill_bulk_urb(urb, acm->dev,
1370                                           usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress),
1371                                           rb->base,
1372                                           acm->readsize,
1373                                           acm_read_bulk_callback, rb);
1374                 }
1375
1376                 acm->read_urbs[i] = urb;
1377                 __set_bit(i, &acm->read_urbs_free);
1378         }
1379         for (i = 0; i < ACM_NW; i++) {
1380                 struct acm_wb *snd = &(acm->wb[i]);
1381
1382                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1383                 if (snd->urb == NULL)
1384                         goto alloc_fail7;
1385
1386                 if (usb_endpoint_xfer_int(epwrite))
1387                         usb_fill_int_urb(snd->urb, usb_dev,
1388                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1389                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1390                 else
1391                         usb_fill_bulk_urb(snd->urb, usb_dev,
1392                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1393                                 NULL, acm->writesize, acm_write_bulk, snd);
1394                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1395                 if (quirks & SEND_ZERO_PACKET)
1396                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1397                 snd->instance = acm;
1398         }
1399
1400         usb_set_intfdata(intf, acm);
1401
1402         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1403         if (i < 0)
1404                 goto alloc_fail7;
1405
1406         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1407                 struct usb_cdc_country_functional_desc * cfd =
1408                                         h.usb_cdc_country_functional_desc;
1409
1410                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1411                 if (!acm->country_codes)
1412                         goto skip_countries;
1413                 acm->country_code_size = cfd->bLength - 4;
1414                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1415                                                         cfd->bLength - 4);
1416                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1417
1418                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1419                 if (i < 0) {
1420                         kfree(acm->country_codes);
1421                         acm->country_codes = NULL;
1422                         acm->country_code_size = 0;
1423                         goto skip_countries;
1424                 }
1425
1426                 i = device_create_file(&intf->dev,
1427                                                 &dev_attr_iCountryCodeRelDate);
1428                 if (i < 0) {
1429                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1430                         kfree(acm->country_codes);
1431                         acm->country_codes = NULL;
1432                         acm->country_code_size = 0;
1433                         goto skip_countries;
1434                 }
1435         }
1436
1437 skip_countries:
1438         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1439                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1440                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1441                          /* works around buggy devices */
1442                          epctrl->bInterval ? epctrl->bInterval : 16);
1443         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1444         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1445
1446         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1447
1448         acm->line.dwDTERate = cpu_to_le32(9600);
1449         acm->line.bDataBits = 8;
1450         acm_set_line(acm, &acm->line);
1451
1452         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1453         usb_set_intfdata(data_interface, acm);
1454
1455         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1456                         &control_interface->dev);
1457         if (IS_ERR(tty_dev)) {
1458                 rv = PTR_ERR(tty_dev);
1459                 goto alloc_fail8;
1460         }
1461
1462         if (quirks & CLEAR_HALT_CONDITIONS) {
1463                 usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress));
1464                 usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress));
1465         }
1466
1467         return 0;
1468 alloc_fail8:
1469         if (!acm->combined_interfaces) {
1470                 /* Clear driver data so that disconnect() returns early. */
1471                 usb_set_intfdata(data_interface, NULL);
1472                 usb_driver_release_interface(&acm_driver, data_interface);
1473         }
1474         if (acm->country_codes) {
1475                 device_remove_file(&acm->control->dev,
1476                                 &dev_attr_wCountryCodes);
1477                 device_remove_file(&acm->control->dev,
1478                                 &dev_attr_iCountryCodeRelDate);
1479                 kfree(acm->country_codes);
1480         }
1481         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1482 alloc_fail7:
1483         usb_set_intfdata(intf, NULL);
1484         for (i = 0; i < ACM_NW; i++)
1485                 usb_free_urb(acm->wb[i].urb);
1486 alloc_fail6:
1487         for (i = 0; i < num_rx_buf; i++)
1488                 usb_free_urb(acm->read_urbs[i]);
1489         acm_read_buffers_free(acm);
1490         usb_free_urb(acm->ctrlurb);
1491 alloc_fail5:
1492         acm_write_buffers_free(acm);
1493 alloc_fail4:
1494         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1495 alloc_fail2:
1496         acm_release_minor(acm);
1497 alloc_fail1:
1498         kfree(acm);
1499 alloc_fail:
1500         return rv;
1501 }
1502
1503 static void stop_data_traffic(struct acm *acm)
1504 {
1505         int i;
1506
1507         usb_kill_urb(acm->ctrlurb);
1508         for (i = 0; i < ACM_NW; i++)
1509                 usb_kill_urb(acm->wb[i].urb);
1510         for (i = 0; i < acm->rx_buflimit; i++)
1511                 usb_kill_urb(acm->read_urbs[i]);
1512
1513         cancel_work_sync(&acm->work);
1514 }
1515
1516 static void acm_disconnect(struct usb_interface *intf)
1517 {
1518         struct acm *acm = usb_get_intfdata(intf);
1519         struct usb_device *usb_dev = interface_to_usbdev(intf);
1520         struct tty_struct *tty;
1521         int i;
1522
1523         /* sibling interface is already cleaning up */
1524         if (!acm)
1525                 return;
1526
1527         mutex_lock(&acm->mutex);
1528         acm->disconnected = true;
1529         if (acm->country_codes) {
1530                 device_remove_file(&acm->control->dev,
1531                                 &dev_attr_wCountryCodes);
1532                 device_remove_file(&acm->control->dev,
1533                                 &dev_attr_iCountryCodeRelDate);
1534         }
1535         wake_up_all(&acm->wioctl);
1536         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1537         usb_set_intfdata(acm->control, NULL);
1538         usb_set_intfdata(acm->data, NULL);
1539         mutex_unlock(&acm->mutex);
1540
1541         tty = tty_port_tty_get(&acm->port);
1542         if (tty) {
1543                 tty_vhangup(tty);
1544                 tty_kref_put(tty);
1545         }
1546
1547         stop_data_traffic(acm);
1548
1549         tty_unregister_device(acm_tty_driver, acm->minor);
1550
1551         usb_free_urb(acm->ctrlurb);
1552         for (i = 0; i < ACM_NW; i++)
1553                 usb_free_urb(acm->wb[i].urb);
1554         for (i = 0; i < acm->rx_buflimit; i++)
1555                 usb_free_urb(acm->read_urbs[i]);
1556         acm_write_buffers_free(acm);
1557         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1558         acm_read_buffers_free(acm);
1559
1560         if (!acm->combined_interfaces)
1561                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1562                                         acm->data : acm->control);
1563
1564         tty_port_put(&acm->port);
1565 }
1566
1567 #ifdef CONFIG_PM
1568 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1569 {
1570         struct acm *acm = usb_get_intfdata(intf);
1571         int cnt;
1572
1573         spin_lock_irq(&acm->write_lock);
1574         if (PMSG_IS_AUTO(message)) {
1575                 if (acm->transmitting) {
1576                         spin_unlock_irq(&acm->write_lock);
1577                         return -EBUSY;
1578                 }
1579         }
1580         cnt = acm->susp_count++;
1581         spin_unlock_irq(&acm->write_lock);
1582
1583         if (cnt)
1584                 return 0;
1585
1586         stop_data_traffic(acm);
1587
1588         return 0;
1589 }
1590
1591 static int acm_resume(struct usb_interface *intf)
1592 {
1593         struct acm *acm = usb_get_intfdata(intf);
1594         struct urb *urb;
1595         int rv = 0;
1596
1597         spin_lock_irq(&acm->write_lock);
1598
1599         if (--acm->susp_count)
1600                 goto out;
1601
1602         if (tty_port_initialized(&acm->port)) {
1603                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1604
1605                 for (;;) {
1606                         urb = usb_get_from_anchor(&acm->delayed);
1607                         if (!urb)
1608                                 break;
1609
1610                         acm_start_wb(acm, urb->context);
1611                 }
1612
1613                 /*
1614                  * delayed error checking because we must
1615                  * do the write path at all cost
1616                  */
1617                 if (rv < 0)
1618                         goto out;
1619
1620                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1621         }
1622 out:
1623         spin_unlock_irq(&acm->write_lock);
1624
1625         return rv;
1626 }
1627
1628 static int acm_reset_resume(struct usb_interface *intf)
1629 {
1630         struct acm *acm = usb_get_intfdata(intf);
1631
1632         if (tty_port_initialized(&acm->port))
1633                 tty_port_tty_hangup(&acm->port, false);
1634
1635         return acm_resume(intf);
1636 }
1637
1638 #endif /* CONFIG_PM */
1639
1640 #define NOKIA_PCSUITE_ACM_INFO(x) \
1641                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1642                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1643                 USB_CDC_ACM_PROTO_VENDOR)
1644
1645 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1646                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1647                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1648                 USB_CDC_ACM_PROTO_VENDOR)
1649
1650 /*
1651  * USB driver structure.
1652  */
1653
1654 static const struct usb_device_id acm_ids[] = {
1655         /* quirky and broken devices */
1656         { USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1657           .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
1658         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1659         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1660         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1661         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1662         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1663         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1664         },
1665         { USB_DEVICE(0x045b, 0x023c),   /* Renesas USB Download mode */
1666         .driver_info = DISABLE_ECHO,    /* Don't echo banner */
1667         },
1668         { USB_DEVICE(0x045b, 0x0248),   /* Renesas USB Download mode */
1669         .driver_info = DISABLE_ECHO,    /* Don't echo banner */
1670         },
1671         { USB_DEVICE(0x045b, 0x024D),   /* Renesas USB Download mode */
1672         .driver_info = DISABLE_ECHO,    /* Don't echo banner */
1673         },
1674         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1675         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1676         },
1677         { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1678         .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1679         },
1680         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1681         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1682         },
1683         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1684         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1685         },
1686         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1687         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1688         },
1689         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1690         .driver_info = SINGLE_RX_URB,
1691         },
1692         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1693         .driver_info = SINGLE_RX_URB, /* firmware bug */
1694         },
1695         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1696         .driver_info = SINGLE_RX_URB, /* firmware bug */
1697         },
1698         { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1699         .driver_info = SINGLE_RX_URB,
1700         },
1701         { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1702         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1703         },
1704         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1705         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1706         },
1707         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1708         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1709         },
1710         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1711         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1712         },
1713         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1714         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1715         },
1716         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1717         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1718         },
1719         { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1720         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1721         },
1722         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1723         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1724         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1725         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1726         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1727         },
1728         /* Motorola H24 HSPA module: */
1729         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1730         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1731         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1732         },
1733         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1734         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1735         },
1736         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1737         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1738         },
1739         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1740         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1741         },
1742         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1743         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1744         },
1745         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1746         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1747         },
1748         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1749         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1750         },
1751
1752         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1753         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1754                                            data interface instead of
1755                                            communications interface.
1756                                            Maybe we should define a new
1757                                            quirk for this. */
1758         },
1759         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1760         .driver_info = NO_UNION_NORMAL,
1761         },
1762         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1763         .driver_info = NO_UNION_NORMAL,
1764         },
1765         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1766         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1767         },
1768         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1769         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1770         },
1771         { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1772         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1773         },
1774         { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1775         .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1776         },
1777         { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1778         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1779         },
1780
1781         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1782         .driver_info = CLEAR_HALT_CONDITIONS,
1783         },
1784
1785         /* Nokia S60 phones expose two ACM channels. The first is
1786          * a modem and is picked up by the standard AT-command
1787          * information below. The second is 'vendor-specific' but
1788          * is treated as a serial device at the S60 end, so we want
1789          * to expose it on Linux too. */
1790         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1791         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1792         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1793         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1794         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1795         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1796         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1797         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1798         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1799         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1800         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1801         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1802         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1803         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1804         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1805         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1806         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1807         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1808         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1809         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1810         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1811         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1812         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1813         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1814         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1815         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1816         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1817         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1818         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1819         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1820         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1821         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1822         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1823         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1824         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1825         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1826         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1827         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1828         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1829         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1830         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1831         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1832         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1833         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1834         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1835         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1836         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1837         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1838         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1839         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1840         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1841         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1842         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1843         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1844         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1845         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1846         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1847         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1848
1849         /* Support for Owen devices */
1850         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1851
1852         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1853
1854         /* Support for Droids MuIn LCD */
1855         { USB_DEVICE(0x04d8, 0x000b),
1856         .driver_info = NO_DATA_INTERFACE,
1857         },
1858
1859 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1860         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1861         .driver_info = IGNORE_DEVICE,
1862         },
1863         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1864         .driver_info = IGNORE_DEVICE,
1865         },
1866
1867         { USB_DEVICE(0x04d8, 0xf58b),
1868         .driver_info = IGNORE_DEVICE,
1869         },
1870 #endif
1871
1872         /*Samsung phone in firmware update mode */
1873         { USB_DEVICE(0x04e8, 0x685d),
1874         .driver_info = IGNORE_DEVICE,
1875         },
1876
1877         /* Exclude Infineon Flash Loader utility */
1878         { USB_DEVICE(0x058b, 0x0041),
1879         .driver_info = IGNORE_DEVICE,
1880         },
1881
1882         /* Exclude ETAS ES58x */
1883         { USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
1884         .driver_info = IGNORE_DEVICE,
1885         },
1886         { USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
1887         .driver_info = IGNORE_DEVICE,
1888         },
1889         { USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
1890         .driver_info = IGNORE_DEVICE,
1891         },
1892
1893         { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1894         .driver_info = SEND_ZERO_PACKET,
1895         },
1896         { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1897         .driver_info = SEND_ZERO_PACKET,
1898         },
1899
1900         /* Exclude Goodix Fingerprint Reader */
1901         { USB_DEVICE(0x27c6, 0x5395),
1902         .driver_info = IGNORE_DEVICE,
1903         },
1904
1905         /* Exclude Heimann Sensor GmbH USB appset demo */
1906         { USB_DEVICE(0x32a7, 0x0000),
1907         .driver_info = IGNORE_DEVICE,
1908         },
1909
1910         /* control interfaces without any protocol set */
1911         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1912                 USB_CDC_PROTO_NONE) },
1913
1914         /* control interfaces with various AT-command sets */
1915         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1916                 USB_CDC_ACM_PROTO_AT_V25TER) },
1917         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1918                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1919         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1920                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1921         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1922                 USB_CDC_ACM_PROTO_AT_GSM) },
1923         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1924                 USB_CDC_ACM_PROTO_AT_3G) },
1925         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1926                 USB_CDC_ACM_PROTO_AT_CDMA) },
1927
1928         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1929         .driver_info = SEND_ZERO_PACKET,
1930         },
1931
1932         { }
1933 };
1934
1935 MODULE_DEVICE_TABLE(usb, acm_ids);
1936
1937 static struct usb_driver acm_driver = {
1938         .name =         "cdc_acm",
1939         .probe =        acm_probe,
1940         .disconnect =   acm_disconnect,
1941 #ifdef CONFIG_PM
1942         .suspend =      acm_suspend,
1943         .resume =       acm_resume,
1944         .reset_resume = acm_reset_resume,
1945 #endif
1946         .id_table =     acm_ids,
1947 #ifdef CONFIG_PM
1948         .supports_autosuspend = 1,
1949 #endif
1950         .disable_hub_initiated_lpm = 1,
1951 };
1952
1953 /*
1954  * TTY driver structures.
1955  */
1956
1957 static const struct tty_operations acm_ops = {
1958         .install =              acm_tty_install,
1959         .open =                 acm_tty_open,
1960         .close =                acm_tty_close,
1961         .cleanup =              acm_tty_cleanup,
1962         .hangup =               acm_tty_hangup,
1963         .write =                acm_tty_write,
1964         .write_room =           acm_tty_write_room,
1965         .ioctl =                acm_tty_ioctl,
1966         .throttle =             acm_tty_throttle,
1967         .unthrottle =           acm_tty_unthrottle,
1968         .chars_in_buffer =      acm_tty_chars_in_buffer,
1969         .break_ctl =            acm_tty_break_ctl,
1970         .set_termios =          acm_tty_set_termios,
1971         .tiocmget =             acm_tty_tiocmget,
1972         .tiocmset =             acm_tty_tiocmset,
1973 };
1974
1975 /*
1976  * Init / exit.
1977  */
1978
1979 static int __init acm_init(void)
1980 {
1981         int retval;
1982         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1983         if (!acm_tty_driver)
1984                 return -ENOMEM;
1985         acm_tty_driver->driver_name = "acm",
1986         acm_tty_driver->name = "ttyACM",
1987         acm_tty_driver->major = ACM_TTY_MAJOR,
1988         acm_tty_driver->minor_start = 0,
1989         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1990         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1991         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1992         acm_tty_driver->init_termios = tty_std_termios;
1993         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1994                                                                 HUPCL | CLOCAL;
1995         tty_set_operations(acm_tty_driver, &acm_ops);
1996
1997         retval = tty_register_driver(acm_tty_driver);
1998         if (retval) {
1999                 put_tty_driver(acm_tty_driver);
2000                 return retval;
2001         }
2002
2003         retval = usb_register(&acm_driver);
2004         if (retval) {
2005                 tty_unregister_driver(acm_tty_driver);
2006                 put_tty_driver(acm_tty_driver);
2007                 return retval;
2008         }
2009
2010         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2011
2012         return 0;
2013 }
2014
2015 static void __exit acm_exit(void)
2016 {
2017         usb_deregister(&acm_driver);
2018         tty_unregister_driver(acm_tty_driver);
2019         put_tty_driver(acm_tty_driver);
2020         idr_destroy(&acm_minors);
2021 }
2022
2023 module_init(acm_init);
2024 module_exit(acm_exit);
2025
2026 MODULE_AUTHOR(DRIVER_AUTHOR);
2027 MODULE_DESCRIPTION(DRIVER_DESC);
2028 MODULE_LICENSE("GPL");
2029 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);