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