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