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                         tty_insert_flip_char(&acm->port, 0, TTY_BREAK);
 340                 }
 341                 if (newctrl & ACM_CTRL_RI)
 342                         acm->iocount.rng++;
 343                 if (newctrl & ACM_CTRL_FRAMING)
 344                         acm->iocount.frame++;
 345                 if (newctrl & ACM_CTRL_PARITY)
 346                         acm->iocount.parity++;
 347                 if (newctrl & ACM_CTRL_OVERRUN)
 348                         acm->iocount.overrun++;
 349                 spin_unlock(&acm->read_lock);
 350
 351                 if (newctrl & ACM_CTRL_BRK)
 352                         tty_flip_buffer_push(&acm->port);
 353
 354                 if (difference)
 355                         wake_up_all(&acm->wioctl);
 356
 357                 break;
 358
 359         default:
 360                 dev_dbg(&acm->control->dev,
 361                         "%s - unknown notification %d received: index %d len %d\n",
 362                         __func__,
 363                         dr->bNotificationType, dr->wIndex, dr->wLength);
 364
 365                 break;
 366         }
 367 exit:
 368         retval = usb_submit_urb(urb, GFP_ATOMIC);
 369         if (retval && retval != -EPERM)
 370                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 371                                                         __func__, retval);
 372 }
 373
 374 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 375 {
 376         int res;
 377
 378         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 379                 return 0;
 380
 381         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
 382
 383         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 384         if (res) {
 385                 if (res != -EPERM && res != -ENODEV) {
 386                         dev_err(&acm->data->dev,
 387                                         "%s - usb_submit_urb failed: %d\n",
 388                                         __func__, res);
 389                 }
 390                 set_bit(index, &acm->read_urbs_free);
 391                 return res;
 392         }
 393
 394         return 0;
 395 }
 396
 397 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 398 {
 399         int res;
 400         int i;
 401
 402         for (i = 0; i < acm->rx_buflimit; ++i) {
 403                 res = acm_submit_read_urb(acm, i, mem_flags);
 404                 if (res)
 405                         return res;
 406         }
 407
 408         return 0;
 409 }
 410
 411 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 412 {
 413         unsigned long flags;
 414
 415         if (!urb->actual_length)
 416                 return;
 417
 418         spin_lock_irqsave(&acm->read_lock, flags);
 419         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 420                         urb->actual_length);
 421         spin_unlock_irqrestore(&acm->read_lock, flags);
 422
 423         tty_flip_buffer_push(&acm->port);
 424 }
 425
 426 static void acm_read_bulk_callback(struct urb *urb)
 427 {
 428         struct acm_rb *rb = urb->context;
 429         struct acm *acm = rb->instance;
 430         unsigned long flags;
 431         int status = urb->status;
 432
 433         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
 434                                         rb->index, urb->actual_length);
 435
 436         if (!acm->dev) {
 437                 set_bit(rb->index, &acm->read_urbs_free);
 438                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 439                 return;
 440         }
 441
 442         if (status) {
 443                 set_bit(rb->index, &acm->read_urbs_free);
 444                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
 445                                                         __func__, status);
 446                 if ((status != -ENOENT) || (urb->actual_length == 0))
 447                         return;
 448         }
 449
 450         usb_mark_last_busy(acm->dev);
 451
 452         acm_process_read_urb(acm, urb);
 453         /*
 454          * Unthrottle may run on another CPU which needs to see events
 455          * in the same order. Submission has an implict barrier
 456          */
 457         smp_mb__before_atomic();
 458         set_bit(rb->index, &acm->read_urbs_free);
 459
 460         /* throttle device if requested by tty */
 461         spin_lock_irqsave(&acm->read_lock, flags);
 462         acm->throttled = acm->throttle_req;
 463         if (!acm->throttled) {
 464                 spin_unlock_irqrestore(&acm->read_lock, flags);
 465                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 466         } else {
 467                 spin_unlock_irqrestore(&acm->read_lock, flags);
 468         }
 469 }
 470
 471 /* data interface wrote those outgoing bytes */
 472 static void acm_write_bulk(struct urb *urb)
 473 {
 474         struct acm_wb *wb = urb->context;
 475         struct acm *acm = wb->instance;
 476         unsigned long flags;
 477         int status = urb->status;
 478
 479         if (status || (urb->actual_length != urb->transfer_buffer_length))
 480                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
 481                         __func__,
 482                         urb->actual_length,
 483                         urb->transfer_buffer_length,
 484                         status);
 485
 486         spin_lock_irqsave(&acm->write_lock, flags);
 487         acm_write_done(acm, wb);
 488         spin_unlock_irqrestore(&acm->write_lock, flags);
 489         schedule_work(&acm->work);
 490 }
 491
 492 static void acm_softint(struct work_struct *work)
 493 {
 494         struct acm *acm = container_of(work, struct acm, work);
 495
 496         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 497
 498         tty_port_tty_wakeup(&acm->port);
 499 }
 500
 501 /*
 502  * TTY handlers
 503  */
 504
 505 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 506 {
 507         struct acm *acm;
 508         int retval;
 509
 510         dev_dbg(tty->dev, "%s\n", __func__);
 511
 512         acm = acm_get_by_minor(tty->index);
 513         if (!acm)
 514                 return -ENODEV;
 515
 516         retval = tty_standard_install(driver, tty);
 517         if (retval)
 518                 goto error_init_termios;
 519
 520         /*
 521          * Suppress initial echoing for some devices which might send data
 522          * immediately after acm driver has been installed.
 523          */
 524         if (acm->quirks & DISABLE_ECHO)
 525                 tty->termios.c_lflag &= ~ECHO;
 526
 527         tty->driver_data = acm;
 528
 529         return 0;
 530
 531 error_init_termios:
 532         tty_port_put(&acm->port);
 533         return retval;
 534 }
 535
 536 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 537 {
 538         struct acm *acm = tty->driver_data;
 539
 540         dev_dbg(tty->dev, "%s\n", __func__);
 541
 542         return tty_port_open(&acm->port, tty, filp);
 543 }
 544
 545 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 546 {
 547         struct acm *acm = container_of(port, struct acm, port);
 548         int val;
 549         int res;
 550
 551         if (raise)
 552                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 553         else
 554                 val = 0;
 555
 556         /* FIXME: add missing ctrlout locking throughout driver */
 557         acm->ctrlout = val;
 558
 559         res = acm_set_control(acm, val);
 560         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 561                 /* This is broken in too many devices to spam the logs */
 562                 dev_dbg(&acm->control->dev, "failed to set dtr/rts\n");
 563 }
 564
 565 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 566 {
 567         struct acm *acm = container_of(port, struct acm, port);
 568         int retval = -ENODEV;
 569         int i;
 570
 571         dev_dbg(&acm->control->dev, "%s\n", __func__);
 572
 573         mutex_lock(&acm->mutex);
 574         if (acm->disconnected)
 575                 goto disconnected;
 576
 577         retval = usb_autopm_get_interface(acm->control);
 578         if (retval)
 579                 goto error_get_interface;
 580
 581         /*
 582          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 583          * memory is really nasty...
 584          */
 585         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 586         acm->control->needs_remote_wakeup = 1;
 587
 588         acm->ctrlurb->dev = acm->dev;
 589         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 590         if (retval) {
 591                 dev_err(&acm->control->dev,
 592                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 593                 goto error_submit_urb;
 594         }
 595
 596         acm_tty_set_termios(tty, NULL);
 597
 598         /*
 599          * Unthrottle device in case the TTY was closed while throttled.
 600          */
 601         spin_lock_irq(&acm->read_lock);
 602         acm->throttled = 0;
 603         acm->throttle_req = 0;
 604         spin_unlock_irq(&acm->read_lock);
 605
 606         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 607         if (retval)
 608                 goto error_submit_read_urbs;
 609
 610         usb_autopm_put_interface(acm->control);
 611
 612         mutex_unlock(&acm->mutex);
 613
 614         return 0;
 615
 616 error_submit_read_urbs:
 617         for (i = 0; i < acm->rx_buflimit; i++)
 618                 usb_kill_urb(acm->read_urbs[i]);
 619         usb_kill_urb(acm->ctrlurb);
 620 error_submit_urb:
 621         usb_autopm_put_interface(acm->control);
 622 error_get_interface:
 623 disconnected:
 624         mutex_unlock(&acm->mutex);
 625
 626         return usb_translate_errors(retval);
 627 }
 628
 629 static void acm_port_destruct(struct tty_port *port)
 630 {
 631         struct acm *acm = container_of(port, struct acm, port);
 632
 633         dev_dbg(&acm->control->dev, "%s\n", __func__);
 634
 635         acm_release_minor(acm);
 636         usb_put_intf(acm->control);
 637         kfree(acm->country_codes);
 638         kfree(acm);
 639 }
 640
 641 static void acm_port_shutdown(struct tty_port *port)
 642 {
 643         struct acm *acm = container_of(port, struct acm, port);
 644         struct urb *urb;
 645         struct acm_wb *wb;
 646         int i;
 647
 648         dev_dbg(&acm->control->dev, "%s\n", __func__);
 649
 650         /*
 651          * Need to grab write_lock to prevent race with resume, but no need to
 652          * hold it due to the tty-port initialised flag.
 653          */
 654         spin_lock_irq(&acm->write_lock);
 655         spin_unlock_irq(&acm->write_lock);
 656
 657         usb_autopm_get_interface_no_resume(acm->control);
 658         acm->control->needs_remote_wakeup = 0;
 659         usb_autopm_put_interface(acm->control);
 660
 661         for (;;) {
 662                 urb = usb_get_from_anchor(&acm->delayed);
 663                 if (!urb)
 664                         break;
 665                 wb = urb->context;
 666                 wb->use = 0;
 667                 usb_autopm_put_interface_async(acm->control);
 668         }
 669
 670         usb_kill_urb(acm->ctrlurb);
 671         for (i = 0; i < ACM_NW; i++)
 672                 usb_kill_urb(acm->wb[i].urb);
 673         for (i = 0; i < acm->rx_buflimit; i++)
 674                 usb_kill_urb(acm->read_urbs[i]);
 675 }
 676
 677 static void acm_tty_cleanup(struct tty_struct *tty)
 678 {
 679         struct acm *acm = tty->driver_data;
 680         dev_dbg(&acm->control->dev, "%s\n", __func__);
 681         tty_port_put(&acm->port);
 682 }
 683
 684 static void acm_tty_hangup(struct tty_struct *tty)
 685 {
 686         struct acm *acm = tty->driver_data;
 687         dev_dbg(&acm->control->dev, "%s\n", __func__);
 688         tty_port_hangup(&acm->port);
 689 }
 690
 691 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 692 {
 693         struct acm *acm = tty->driver_data;
 694         dev_dbg(&acm->control->dev, "%s\n", __func__);
 695         tty_port_close(&acm->port, tty, filp);
 696 }
 697
 698 static int acm_tty_write(struct tty_struct *tty,
 699                                         const unsigned char *buf, int count)
 700 {
 701         struct acm *acm = tty->driver_data;
 702         int stat;
 703         unsigned long flags;
 704         int wbn;
 705         struct acm_wb *wb;
 706
 707         if (!count)
 708                 return 0;
 709
 710         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 711
 712         spin_lock_irqsave(&acm->write_lock, flags);
 713         wbn = acm_wb_alloc(acm);
 714         if (wbn < 0) {
 715                 spin_unlock_irqrestore(&acm->write_lock, flags);
 716                 return 0;
 717         }
 718         wb = &acm->wb[wbn];
 719
 720         if (!acm->dev) {
 721                 wb->use = 0;
 722                 spin_unlock_irqrestore(&acm->write_lock, flags);
 723                 return -ENODEV;
 724         }
 725
 726         count = (count > acm->writesize) ? acm->writesize : count;
 727         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 728         memcpy(wb->buf, buf, count);
 729         wb->len = count;
 730
 731         stat = usb_autopm_get_interface_async(acm->control);
 732         if (stat) {
 733                 wb->use = 0;
 734                 spin_unlock_irqrestore(&acm->write_lock, flags);
 735                 return stat;
 736         }
 737
 738         if (acm->susp_count) {
 739                 usb_anchor_urb(wb->urb, &acm->delayed);
 740                 spin_unlock_irqrestore(&acm->write_lock, flags);
 741                 return count;
 742         }
 743
 744         stat = acm_start_wb(acm, wb);
 745         spin_unlock_irqrestore(&acm->write_lock, flags);
 746
 747         if (stat < 0)
 748                 return stat;
 749         return count;
 750 }
 751
 752 static int acm_tty_write_room(struct tty_struct *tty)
 753 {
 754         struct acm *acm = tty->driver_data;
 755         /*
 756          * Do not let the line discipline to know that we have a reserve,
 757          * or it might get too enthusiastic.
 758          */
 759         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 760 }
 761
 762 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 763 {
 764         struct acm *acm = tty->driver_data;
 765         /*
 766          * if the device was unplugged then any remaining characters fell out
 767          * of the connector ;)
 768          */
 769         if (acm->disconnected)
 770                 return 0;
 771         /*
 772          * This is inaccurate (overcounts), but it works.
 773          */
 774         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 775 }
 776
 777 static void acm_tty_throttle(struct tty_struct *tty)
 778 {
 779         struct acm *acm = tty->driver_data;
 780
 781         spin_lock_irq(&acm->read_lock);
 782         acm->throttle_req = 1;
 783         spin_unlock_irq(&acm->read_lock);
 784 }
 785
 786 static void acm_tty_unthrottle(struct tty_struct *tty)
 787 {
 788         struct acm *acm = tty->driver_data;
 789         unsigned int was_throttled;
 790
 791         spin_lock_irq(&acm->read_lock);
 792         was_throttled = acm->throttled;
 793         acm->throttled = 0;
 794         acm->throttle_req = 0;
 795         spin_unlock_irq(&acm->read_lock);
 796
 797         if (was_throttled)
 798                 acm_submit_read_urbs(acm, GFP_KERNEL);
 799 }
 800
 801 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 802 {
 803         struct acm *acm = tty->driver_data;
 804         int retval;
 805
 806         retval = acm_send_break(acm, state ? 0xffff : 0);
 807         if (retval < 0)
 808                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 809                                                                 __func__);
 810         return retval;
 811 }
 812
 813 static int acm_tty_tiocmget(struct tty_struct *tty)
 814 {
 815         struct acm *acm = tty->driver_data;
 816
 817         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 818                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 819                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 820                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 821                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 822                TIOCM_CTS;
 823 }
 824
 825 static int acm_tty_tiocmset(struct tty_struct *tty,
 826                             unsigned int set, unsigned int clear)
 827 {
 828         struct acm *acm = tty->driver_data;
 829         unsigned int newctrl;
 830
 831         newctrl = acm->ctrlout;
 832         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 833                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 834         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 835                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 836
 837         newctrl = (newctrl & ~clear) | set;
 838
 839         if (acm->ctrlout == newctrl)
 840                 return 0;
 841         return acm_set_control(acm, acm->ctrlout = newctrl);
 842 }
 843
 844 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 845 {
 846         struct serial_struct tmp;
 847
 848         if (!info)
 849                 return -EINVAL;
 850
 851         memset(&tmp, 0, sizeof(tmp));
 852         tmp.flags = ASYNC_LOW_LATENCY;
 853         tmp.xmit_fifo_size = acm->writesize;
 854         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 855         tmp.close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
 856         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 857                                 ASYNC_CLOSING_WAIT_NONE :
 858                                 jiffies_to_msecs(acm->port.closing_wait) / 10;
 859
 860         if (copy_to_user(info, &tmp, sizeof(tmp)))
 861                 return -EFAULT;
 862         else
 863                 return 0;
 864 }
 865
 866 static int set_serial_info(struct acm *acm,
 867                                 struct serial_struct __user *newinfo)
 868 {
 869         struct serial_struct new_serial;
 870         unsigned int closing_wait, close_delay;
 871         unsigned int old_closing_wait, old_close_delay;
 872         int retval = 0;
 873
 874         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 875                 return -EFAULT;
 876
 877         close_delay = msecs_to_jiffies(new_serial.close_delay * 10);
 878         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 879                         ASYNC_CLOSING_WAIT_NONE :
 880                         msecs_to_jiffies(new_serial.closing_wait * 10);
 881
 882         /* we must redo the rounding here, so that the values match */
 883         old_close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
 884         old_closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 885                                 ASYNC_CLOSING_WAIT_NONE :
 886                                 jiffies_to_msecs(acm->port.closing_wait) / 10;
 887
 888         mutex_lock(&acm->port.mutex);
 889
 890         if (!capable(CAP_SYS_ADMIN)) {
 891                 if ((new_serial.close_delay != old_close_delay) ||
 892                     (new_serial.closing_wait != old_closing_wait))
 893                         retval = -EPERM;
 894         } else {
 895                 acm->port.close_delay  = close_delay;
 896                 acm->port.closing_wait = closing_wait;
 897         }
 898
 899         mutex_unlock(&acm->port.mutex);
 900         return retval;
 901 }
 902
 903 static int wait_serial_change(struct acm *acm, unsigned long arg)
 904 {
 905         int rv = 0;
 906         DECLARE_WAITQUEUE(wait, current);
 907         struct async_icount old, new;
 908
 909         do {
 910                 spin_lock_irq(&acm->read_lock);
 911                 old = acm->oldcount;
 912                 new = acm->iocount;
 913                 acm->oldcount = new;
 914                 spin_unlock_irq(&acm->read_lock);
 915
 916                 if ((arg & TIOCM_DSR) &&
 917                         old.dsr != new.dsr)
 918                         break;
 919                 if ((arg & TIOCM_CD)  &&
 920                         old.dcd != new.dcd)
 921                         break;
 922                 if ((arg & TIOCM_RI) &&
 923                         old.rng != new.rng)
 924                         break;
 925
 926                 add_wait_queue(&acm->wioctl, &wait);
 927                 set_current_state(TASK_INTERRUPTIBLE);
 928                 schedule();
 929                 remove_wait_queue(&acm->wioctl, &wait);
 930                 if (acm->disconnected) {
 931                         if (arg & TIOCM_CD)
 932                                 break;
 933                         else
 934                                 rv = -ENODEV;
 935                 } else {
 936                         if (signal_pending(current))
 937                                 rv = -ERESTARTSYS;
 938                 }
 939         } while (!rv);
 940
 941
 942
 943         return rv;
 944 }
 945
 946 static int get_serial_usage(struct acm *acm,
 947                             struct serial_icounter_struct __user *count)
 948 {
 949         struct serial_icounter_struct icount;
 950         int rv = 0;
 951
 952         memset(&icount, 0, sizeof(icount));
 953         icount.dsr = acm->iocount.dsr;
 954         icount.rng = acm->iocount.rng;
 955         icount.dcd = acm->iocount.dcd;
 956         icount.frame = acm->iocount.frame;
 957         icount.overrun = acm->iocount.overrun;
 958         icount.parity = acm->iocount.parity;
 959         icount.brk = acm->iocount.brk;
 960
 961         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 962                 rv = -EFAULT;
 963
 964         return rv;
 965 }
 966
 967 static int acm_tty_ioctl(struct tty_struct *tty,
 968                                         unsigned int cmd, unsigned long arg)
 969 {
 970         struct acm *acm = tty->driver_data;
 971         int rv = -ENOIOCTLCMD;
 972
 973         switch (cmd) {
 974         case TIOCGSERIAL: /* gets serial port data */
 975                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 976                 break;
 977         case TIOCSSERIAL:
 978                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 979                 break;
 980         case TIOCMIWAIT:
 981                 rv = usb_autopm_get_interface(acm->control);
 982                 if (rv < 0) {
 983                         rv = -EIO;
 984                         break;
 985                 }
 986                 rv = wait_serial_change(acm, arg);
 987                 usb_autopm_put_interface(acm->control);
 988                 break;
 989         case TIOCGICOUNT:
 990                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
 991                 break;
 992         }
 993
 994         return rv;
 995 }
 996
 997 static void acm_tty_set_termios(struct tty_struct *tty,
 998                                                 struct ktermios *termios_old)
 999 {
1000         struct acm *acm = tty->driver_data;
1001         struct ktermios *termios = &tty->termios;
1002         struct usb_cdc_line_coding newline;
1003         int newctrl = acm->ctrlout;
1004
1005         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1006         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1007         newline.bParityType = termios->c_cflag & PARENB ?
1008                                 (termios->c_cflag & PARODD ? 1 : 2) +
1009                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1010         switch (termios->c_cflag & CSIZE) {
1011         case CS5:
1012                 newline.bDataBits = 5;
1013                 break;
1014         case CS6:
1015                 newline.bDataBits = 6;
1016                 break;
1017         case CS7:
1018                 newline.bDataBits = 7;
1019                 break;
1020         case CS8:
1021         default:
1022                 newline.bDataBits = 8;
1023                 break;
1024         }
1025         /* FIXME: Needs to clear unsupported bits in the termios */
1026         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1027
1028         if (C_BAUD(tty) == B0) {
1029                 newline.dwDTERate = acm->line.dwDTERate;
1030                 newctrl &= ~ACM_CTRL_DTR;
1031         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1032                 newctrl |=  ACM_CTRL_DTR;
1033         }
1034
1035         if (newctrl != acm->ctrlout)
1036                 acm_set_control(acm, acm->ctrlout = newctrl);
1037
1038         if (memcmp(&acm->line, &newline, sizeof newline)) {
1039                 memcpy(&acm->line, &newline, sizeof newline);
1040                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1041                         __func__,
1042                         le32_to_cpu(newline.dwDTERate),
1043                         newline.bCharFormat, newline.bParityType,
1044                         newline.bDataBits);
1045                 acm_set_line(acm, &acm->line);
1046         }
1047 }
1048
1049 static const struct tty_port_operations acm_port_ops = {
1050         .dtr_rts = acm_port_dtr_rts,
1051         .shutdown = acm_port_shutdown,
1052         .activate = acm_port_activate,
1053         .destruct = acm_port_destruct,
1054 };
1055
1056 /*
1057  * USB probe and disconnect routines.
1058  */
1059
1060 /* Little helpers: write/read buffers free */
1061 static void acm_write_buffers_free(struct acm *acm)
1062 {
1063         int i;
1064         struct acm_wb *wb;
1065         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1066
1067         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1068                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1069 }
1070
1071 static void acm_read_buffers_free(struct acm *acm)
1072 {
1073         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1074         int i;
1075
1076         for (i = 0; i < acm->rx_buflimit; i++)
1077                 usb_free_coherent(usb_dev, acm->readsize,
1078                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1079 }
1080
1081 /* Little helper: write buffers allocate */
1082 static int acm_write_buffers_alloc(struct acm *acm)
1083 {
1084         int i;
1085         struct acm_wb *wb;
1086
1087         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1088                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1089                     &wb->dmah);
1090                 if (!wb->buf) {
1091                         while (i != 0) {
1092                                 --i;
1093                                 --wb;
1094                                 usb_free_coherent(acm->dev, acm->writesize,
1095                                     wb->buf, wb->dmah);
1096                         }
1097                         return -ENOMEM;
1098                 }
1099         }
1100         return 0;
1101 }
1102
1103 static int acm_probe(struct usb_interface *intf,
1104                      const struct usb_device_id *id)
1105 {
1106         struct usb_cdc_union_desc *union_header = NULL;
1107         struct usb_cdc_country_functional_desc *cfd = NULL;
1108         unsigned char *buffer = intf->altsetting->extra;
1109         int buflen = intf->altsetting->extralen;
1110         struct usb_interface *control_interface;
1111         struct usb_interface *data_interface;
1112         struct usb_endpoint_descriptor *epctrl = NULL;
1113         struct usb_endpoint_descriptor *epread = NULL;
1114         struct usb_endpoint_descriptor *epwrite = NULL;
1115         struct usb_device *usb_dev = interface_to_usbdev(intf);
1116         struct acm *acm;
1117         int minor;
1118         int ctrlsize, readsize;
1119         u8 *buf;
1120         u8 ac_management_function = 0;
1121         u8 call_management_function = 0;
1122         int call_interface_num = -1;
1123         int data_interface_num = -1;
1124         unsigned long quirks;
1125         int num_rx_buf;
1126         int i;
1127         unsigned int elength = 0;
1128         int combined_interfaces = 0;
1129         struct device *tty_dev;
1130         int rv = -ENOMEM;
1131
1132         /* normal quirks */
1133         quirks = (unsigned long)id->driver_info;
1134
1135         if (quirks == IGNORE_DEVICE)
1136                 return -ENODEV;
1137
1138         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1139
1140         /* handle quirks deadly to normal probing*/
1141         if (quirks == NO_UNION_NORMAL) {
1142                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1143                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1144                 /* we would crash */
1145                 if (!data_interface || !control_interface)
1146                         return -ENODEV;
1147                 goto skip_normal_probe;
1148         }
1149
1150         /* normal probing*/
1151         if (!buffer) {
1152                 dev_err(&intf->dev, "Weird descriptor references\n");
1153                 return -EINVAL;
1154         }
1155
1156         if (!buflen) {
1157                 if (intf->cur_altsetting->endpoint &&
1158                                 intf->cur_altsetting->endpoint->extralen &&
1159                                 intf->cur_altsetting->endpoint->extra) {
1160                         dev_dbg(&intf->dev,
1161                                 "Seeking extra descriptors on endpoint\n");
1162                         buflen = intf->cur_altsetting->endpoint->extralen;
1163                         buffer = intf->cur_altsetting->endpoint->extra;
1164                 } else {
1165                         dev_err(&intf->dev,
1166                                 "Zero length descriptor references\n");
1167                         return -EINVAL;
1168                 }
1169         }
1170
1171         while (buflen > 0) {
1172                 elength = buffer[0];
1173                 if (!elength) {
1174                         dev_err(&intf->dev, "skipping garbage byte\n");
1175                         elength = 1;
1176                         goto next_desc;
1177                 }
1178                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1179                         dev_err(&intf->dev, "skipping garbage\n");
1180                         goto next_desc;
1181                 }
1182
1183                 switch (buffer[2]) {
1184                 case USB_CDC_UNION_TYPE: /* we've found it */
1185                         if (elength < sizeof(struct usb_cdc_union_desc))
1186                                 goto next_desc;
1187                         if (union_header) {
1188                                 dev_err(&intf->dev, "More than one "
1189                                         "union descriptor, skipping ...\n");
1190                                 goto next_desc;
1191                         }
1192                         union_header = (struct usb_cdc_union_desc *)buffer;
1193                         break;
1194                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1195                         if (elength < sizeof(struct usb_cdc_country_functional_desc))
1196                                 goto next_desc;
1197                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1198                         break;
1199                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1200                         break; /* for now we ignore it */
1201                 case USB_CDC_ACM_TYPE:
1202                         if (elength < 4)
1203                                 goto next_desc;
1204                         ac_management_function = buffer[3];
1205                         break;
1206                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1207                         if (elength < 5)
1208                                 goto next_desc;
1209                         call_management_function = buffer[3];
1210                         call_interface_num = buffer[4];
1211                         break;
1212                 default:
1213                         /*
1214                          * there are LOTS more CDC descriptors that
1215                          * could legitimately be found here.
1216                          */
1217                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1218                                         "type %02x, length %ud\n",
1219                                         buffer[2], elength);
1220                         break;
1221                 }
1222 next_desc:
1223                 buflen -= elength;
1224                 buffer += elength;
1225         }
1226
1227         if (!union_header) {
1228                 if (call_interface_num > 0) {
1229                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1230                         /* quirks for Droids MuIn LCD */
1231                         if (quirks & NO_DATA_INTERFACE)
1232                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1233                         else
1234                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1235                         control_interface = intf;
1236                 } else {
1237                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1238                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1239                                 return -ENODEV;
1240                         } else {
1241                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1242                                 combined_interfaces = 1;
1243                                 control_interface = data_interface = intf;
1244                                 goto look_for_collapsed_interface;
1245                         }
1246                 }
1247         } else {
1248                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1249                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1250         }
1251
1252         if (!control_interface || !data_interface) {
1253                 dev_dbg(&intf->dev, "no interfaces\n");
1254                 return -ENODEV;
1255         }
1256
1257         if (data_interface_num != call_interface_num)
1258                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1259
1260         if (control_interface == data_interface) {
1261                 /* some broken devices designed for windows work this way */
1262                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1263                 combined_interfaces = 1;
1264                 /* a popular other OS doesn't use it */
1265                 quirks |= NO_CAP_LINE;
1266                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1267                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1268                         return -EINVAL;
1269                 }
1270 look_for_collapsed_interface:
1271                 for (i = 0; i < 3; i++) {
1272                         struct usb_endpoint_descriptor *ep;
1273                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1274
1275                         if (usb_endpoint_is_int_in(ep))
1276                                 epctrl = ep;
1277                         else if (usb_endpoint_is_bulk_out(ep))
1278                                 epwrite = ep;
1279                         else if (usb_endpoint_is_bulk_in(ep))
1280                                 epread = ep;
1281                         else
1282                                 return -EINVAL;
1283                 }
1284                 if (!epctrl || !epread || !epwrite)
1285                         return -ENODEV;
1286                 else
1287                         goto made_compressed_probe;
1288         }
1289
1290 skip_normal_probe:
1291
1292         /*workaround for switched interfaces */
1293         if (data_interface->cur_altsetting->desc.bInterfaceClass
1294                                                 != CDC_DATA_INTERFACE_TYPE) {
1295                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1296                                                 == CDC_DATA_INTERFACE_TYPE) {
1297                         dev_dbg(&intf->dev,
1298                                 "Your device has switched interfaces.\n");
1299                         swap(control_interface, data_interface);
1300                 } else {
1301                         return -EINVAL;
1302                 }
1303         }
1304
1305         /* Accept probe requests only for the control interface */
1306         if (!combined_interfaces && intf != control_interface)
1307                 return -ENODEV;
1308
1309         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1310                 /* valid in this context */
1311                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1312                 return -EBUSY;
1313         }
1314
1315
1316         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1317             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1318                 return -EINVAL;
1319
1320         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1321         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1322         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1323
1324
1325         /* workaround for switched endpoints */
1326         if (!usb_endpoint_dir_in(epread)) {
1327                 /* descriptors are swapped */
1328                 dev_dbg(&intf->dev,
1329                         "The data interface has switched endpoints\n");
1330                 swap(epread, epwrite);
1331         }
1332 made_compressed_probe:
1333         dev_dbg(&intf->dev, "interfaces are valid\n");
1334
1335         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1336         if (acm == NULL)
1337                 goto alloc_fail;
1338
1339         ctrlsize = usb_endpoint_maxp(epctrl);
1340         readsize = usb_endpoint_maxp(epread) *
1341                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1342         acm->combined_interfaces = combined_interfaces;
1343         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1344         acm->control = control_interface;
1345         acm->data = data_interface;
1346
1347         usb_get_intf(acm->control); /* undone in destruct() */
1348
1349         minor = acm_alloc_minor(acm);
1350         if (minor < 0) {
1351                 dev_err(&intf->dev, "no more free acm devices\n");
1352                 kfree(acm);
1353                 return -ENODEV;
1354         }
1355
1356         acm->minor = minor;
1357         acm->dev = usb_dev;
1358         acm->ctrl_caps = ac_management_function;
1359         if (quirks & NO_CAP_LINE)
1360                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1361         acm->ctrlsize = ctrlsize;
1362         acm->readsize = readsize;
1363         acm->rx_buflimit = num_rx_buf;
1364         INIT_WORK(&acm->work, acm_softint);
1365         init_waitqueue_head(&acm->wioctl);
1366         spin_lock_init(&acm->write_lock);
1367         spin_lock_init(&acm->read_lock);
1368         mutex_init(&acm->mutex);
1369         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1370         if (acm->is_int_ep)
1371                 acm->bInterval = epread->bInterval;
1372         tty_port_init(&acm->port);
1373         acm->port.ops = &acm_port_ops;
1374         init_usb_anchor(&acm->delayed);
1375         acm->quirks = quirks;
1376
1377         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1378         if (!buf)
1379                 goto alloc_fail2;
1380         acm->ctrl_buffer = buf;
1381
1382         if (acm_write_buffers_alloc(acm) < 0)
1383                 goto alloc_fail4;
1384
1385         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1386         if (!acm->ctrlurb)
1387                 goto alloc_fail5;
1388
1389         for (i = 0; i < num_rx_buf; i++) {
1390                 struct acm_rb *rb = &(acm->read_buffers[i]);
1391                 struct urb *urb;
1392
1393                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1394                                                                 &rb->dma);
1395                 if (!rb->base)
1396                         goto alloc_fail6;
1397                 rb->index = i;
1398                 rb->instance = acm;
1399
1400                 urb = usb_alloc_urb(0, GFP_KERNEL);
1401                 if (!urb)
1402                         goto alloc_fail6;
1403
1404                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1405                 urb->transfer_dma = rb->dma;
1406                 if (acm->is_int_ep) {
1407                         usb_fill_int_urb(urb, acm->dev,
1408                                          usb_rcvintpipe(usb_dev, epread->bEndpointAddress),
1409                                          rb->base,
1410                                          acm->readsize,
1411                                          acm_read_bulk_callback, rb,
1412                                          acm->bInterval);
1413                 } else {
1414                         usb_fill_bulk_urb(urb, acm->dev,
1415                                           usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress),
1416                                           rb->base,
1417                                           acm->readsize,
1418                                           acm_read_bulk_callback, rb);
1419                 }
1420
1421                 acm->read_urbs[i] = urb;
1422                 __set_bit(i, &acm->read_urbs_free);
1423         }
1424         for (i = 0; i < ACM_NW; i++) {
1425                 struct acm_wb *snd = &(acm->wb[i]);
1426
1427                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1428                 if (snd->urb == NULL)
1429                         goto alloc_fail7;
1430
1431                 if (usb_endpoint_xfer_int(epwrite))
1432                         usb_fill_int_urb(snd->urb, usb_dev,
1433                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1434                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1435                 else
1436                         usb_fill_bulk_urb(snd->urb, usb_dev,
1437                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1438                                 NULL, acm->writesize, acm_write_bulk, snd);
1439                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1440                 if (quirks & SEND_ZERO_PACKET)
1441                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1442                 snd->instance = acm;
1443         }
1444
1445         usb_set_intfdata(intf, acm);
1446
1447         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1448         if (i < 0)
1449                 goto alloc_fail7;
1450
1451         if (cfd) { /* export the country data */
1452                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1453                 if (!acm->country_codes)
1454                         goto skip_countries;
1455                 acm->country_code_size = cfd->bLength - 4;
1456                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1457                                                         cfd->bLength - 4);
1458                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1459
1460                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1461                 if (i < 0) {
1462                         kfree(acm->country_codes);
1463                         acm->country_codes = NULL;
1464                         acm->country_code_size = 0;
1465                         goto skip_countries;
1466                 }
1467
1468                 i = device_create_file(&intf->dev,
1469                                                 &dev_attr_iCountryCodeRelDate);
1470                 if (i < 0) {
1471                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1472                         kfree(acm->country_codes);
1473                         acm->country_codes = NULL;
1474                         acm->country_code_size = 0;
1475                         goto skip_countries;
1476                 }
1477         }
1478
1479 skip_countries:
1480         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1481                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1482                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1483                          /* works around buggy devices */
1484                          epctrl->bInterval ? epctrl->bInterval : 16);
1485         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1486         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1487
1488         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1489
1490         acm->line.dwDTERate = cpu_to_le32(9600);
1491         acm->line.bDataBits = 8;
1492         acm_set_line(acm, &acm->line);
1493
1494         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1495         usb_set_intfdata(data_interface, acm);
1496
1497         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1498                         &control_interface->dev);
1499         if (IS_ERR(tty_dev)) {
1500                 rv = PTR_ERR(tty_dev);
1501                 goto alloc_fail8;
1502         }
1503
1504         if (quirks & CLEAR_HALT_CONDITIONS) {
1505                 usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress));
1506                 usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress));
1507         }
1508
1509         return 0;
1510 alloc_fail8:
1511         if (!acm->combined_interfaces) {
1512                 /* Clear driver data so that disconnect() returns early. */
1513                 usb_set_intfdata(data_interface, NULL);
1514                 usb_driver_release_interface(&acm_driver, data_interface);
1515         }
1516         if (acm->country_codes) {
1517                 device_remove_file(&acm->control->dev,
1518                                 &dev_attr_wCountryCodes);
1519                 device_remove_file(&acm->control->dev,
1520                                 &dev_attr_iCountryCodeRelDate);
1521                 kfree(acm->country_codes);
1522         }
1523         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1524 alloc_fail7:
1525         usb_set_intfdata(intf, NULL);
1526         for (i = 0; i < ACM_NW; i++)
1527                 usb_free_urb(acm->wb[i].urb);
1528 alloc_fail6:
1529         for (i = 0; i < num_rx_buf; i++)
1530                 usb_free_urb(acm->read_urbs[i]);
1531         acm_read_buffers_free(acm);
1532         usb_free_urb(acm->ctrlurb);
1533 alloc_fail5:
1534         acm_write_buffers_free(acm);
1535 alloc_fail4:
1536         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1537 alloc_fail2:
1538         acm_release_minor(acm);
1539         kfree(acm);
1540 alloc_fail:
1541         return rv;
1542 }
1543
1544 static void stop_data_traffic(struct acm *acm)
1545 {
1546         int i;
1547
1548         dev_dbg(&acm->control->dev, "%s\n", __func__);
1549
1550         usb_kill_urb(acm->ctrlurb);
1551         for (i = 0; i < ACM_NW; i++)
1552                 usb_kill_urb(acm->wb[i].urb);
1553         for (i = 0; i < acm->rx_buflimit; i++)
1554                 usb_kill_urb(acm->read_urbs[i]);
1555
1556         cancel_work_sync(&acm->work);
1557 }
1558
1559 static void acm_disconnect(struct usb_interface *intf)
1560 {
1561         struct acm *acm = usb_get_intfdata(intf);
1562         struct usb_device *usb_dev = interface_to_usbdev(intf);
1563         struct tty_struct *tty;
1564         int i;
1565
1566         dev_dbg(&intf->dev, "%s\n", __func__);
1567
1568         /* sibling interface is already cleaning up */
1569         if (!acm)
1570                 return;
1571
1572         mutex_lock(&acm->mutex);
1573         acm->disconnected = true;
1574         if (acm->country_codes) {
1575                 device_remove_file(&acm->control->dev,
1576                                 &dev_attr_wCountryCodes);
1577                 device_remove_file(&acm->control->dev,
1578                                 &dev_attr_iCountryCodeRelDate);
1579         }
1580         wake_up_all(&acm->wioctl);
1581         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1582         usb_set_intfdata(acm->control, NULL);
1583         usb_set_intfdata(acm->data, NULL);
1584         mutex_unlock(&acm->mutex);
1585
1586         tty = tty_port_tty_get(&acm->port);
1587         if (tty) {
1588                 tty_vhangup(tty);
1589                 tty_kref_put(tty);
1590         }
1591
1592         stop_data_traffic(acm);
1593
1594         tty_unregister_device(acm_tty_driver, acm->minor);
1595
1596         usb_free_urb(acm->ctrlurb);
1597         for (i = 0; i < ACM_NW; i++)
1598                 usb_free_urb(acm->wb[i].urb);
1599         for (i = 0; i < acm->rx_buflimit; i++)
1600                 usb_free_urb(acm->read_urbs[i]);
1601         acm_write_buffers_free(acm);
1602         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1603         acm_read_buffers_free(acm);
1604
1605         if (!acm->combined_interfaces)
1606                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1607                                         acm->data : acm->control);
1608
1609         tty_port_put(&acm->port);
1610 }
1611
1612 #ifdef CONFIG_PM
1613 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1614 {
1615         struct acm *acm = usb_get_intfdata(intf);
1616         int cnt;
1617
1618         spin_lock_irq(&acm->write_lock);
1619         if (PMSG_IS_AUTO(message)) {
1620                 if (acm->transmitting) {
1621                         spin_unlock_irq(&acm->write_lock);
1622                         return -EBUSY;
1623                 }
1624         }
1625         cnt = acm->susp_count++;
1626         spin_unlock_irq(&acm->write_lock);
1627
1628         if (cnt)
1629                 return 0;
1630
1631         stop_data_traffic(acm);
1632
1633         return 0;
1634 }
1635
1636 static int acm_resume(struct usb_interface *intf)
1637 {
1638         struct acm *acm = usb_get_intfdata(intf);
1639         struct urb *urb;
1640         int rv = 0;
1641
1642         spin_lock_irq(&acm->write_lock);
1643
1644         if (--acm->susp_count)
1645                 goto out;
1646
1647         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1648                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1649
1650                 for (;;) {
1651                         urb = usb_get_from_anchor(&acm->delayed);
1652                         if (!urb)
1653                                 break;
1654
1655                         acm_start_wb(acm, urb->context);
1656                 }
1657
1658                 /*
1659                  * delayed error checking because we must
1660                  * do the write path at all cost
1661                  */
1662                 if (rv < 0)
1663                         goto out;
1664
1665                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1666         }
1667 out:
1668         spin_unlock_irq(&acm->write_lock);
1669
1670         return rv;
1671 }
1672
1673 static int acm_reset_resume(struct usb_interface *intf)
1674 {
1675         struct acm *acm = usb_get_intfdata(intf);
1676
1677         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1678                 tty_port_tty_hangup(&acm->port, false);
1679
1680         return acm_resume(intf);
1681 }
1682
1683 #endif /* CONFIG_PM */
1684
1685 #define NOKIA_PCSUITE_ACM_INFO(x) \
1686                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1687                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1688                 USB_CDC_ACM_PROTO_VENDOR)
1689
1690 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1691                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1692                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1693                 USB_CDC_ACM_PROTO_VENDOR)
1694
1695 /*
1696  * USB driver structure.
1697  */
1698
1699 static const struct usb_device_id acm_ids[] = {
1700         /* quirky and broken devices */
1701         { USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1702           .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
1703         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1704         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1705         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1706         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1707         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1708         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1709         },
1710         { USB_DEVICE(0x045b, 0x023c),   /* Renesas USB Download mode */
1711         .driver_info = DISABLE_ECHO,    /* Don't echo banner */
1712         },
1713         { USB_DEVICE(0x045b, 0x0248),   /* Renesas USB Download mode */
1714         .driver_info = DISABLE_ECHO,    /* Don't echo banner */
1715         },
1716         { USB_DEVICE(0x045b, 0x024D),   /* Renesas USB Download mode */
1717         .driver_info = DISABLE_ECHO,    /* Don't echo banner */
1718         },
1719         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1720         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1721         },
1722         { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1723         .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1724         },
1725         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1726         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1727         },
1728         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1729         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1730         },
1731         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1732         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1733         },
1734         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1735         .driver_info = SINGLE_RX_URB,
1736         },
1737         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1738         .driver_info = SINGLE_RX_URB, /* firmware bug */
1739         },
1740         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1741         .driver_info = SINGLE_RX_URB, /* firmware bug */
1742         },
1743         { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1744         .driver_info = SINGLE_RX_URB,
1745         },
1746         { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1747         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1748         },
1749         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1750         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1751         },
1752         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1753         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1754         },
1755         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1756         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1757         },
1758         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1759         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1760         },
1761         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1762         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1763         },
1764         { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1765         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1766         },
1767         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1768         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1769         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1770         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1771         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1772         },
1773         /* Motorola H24 HSPA module: */
1774         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1775         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1776         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1777         },
1778         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1779         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1780         },
1781         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1782         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1783         },
1784         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1785         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1786         },
1787         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1788         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1789         },
1790         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1791         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1792         },
1793         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1794         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1795         },
1796
1797         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1798         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1799                                            data interface instead of
1800                                            communications interface.
1801                                            Maybe we should define a new
1802                                            quirk for this. */
1803         },
1804         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1805         .driver_info = NO_UNION_NORMAL,
1806         },
1807         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1808         .driver_info = NO_UNION_NORMAL,
1809         },
1810         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1811         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1812         },
1813         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1814         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1815         },
1816         { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1817         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1818         },
1819         { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1820         .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1821         },
1822         { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1823         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1824         },
1825
1826         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1827         .driver_info = CLEAR_HALT_CONDITIONS,
1828         },
1829
1830         /* Nokia S60 phones expose two ACM channels. The first is
1831          * a modem and is picked up by the standard AT-command
1832          * information below. The second is 'vendor-specific' but
1833          * is treated as a serial device at the S60 end, so we want
1834          * to expose it on Linux too. */
1835         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1836         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1837         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1838         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1839         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1840         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1841         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1842         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1843         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1844         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1845         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1846         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1847         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1848         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1849         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1850         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1851         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1852         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1853         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1854         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1855         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1856         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1857         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1858         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1859         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1860         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1861         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1862         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1863         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1864         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1865         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1866         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1867         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1868         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1869         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1870         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1871         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1872         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1873         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1874         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1875         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1876         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1877         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1878         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1879         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1880         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1881         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1882         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1883         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1884         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1885         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1886         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1887         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1888         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1889         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1890         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1891         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1892         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1893
1894         /* Support for Owen devices */
1895         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1896
1897         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1898
1899         /* Support for Droids MuIn LCD */
1900         { USB_DEVICE(0x04d8, 0x000b),
1901         .driver_info = NO_DATA_INTERFACE,
1902         },
1903
1904 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1905         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1906         .driver_info = IGNORE_DEVICE,
1907         },
1908         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1909         .driver_info = IGNORE_DEVICE,
1910         },
1911
1912         { USB_DEVICE(0x04d8, 0xf58b),
1913         .driver_info = IGNORE_DEVICE,
1914         },
1915 #endif
1916
1917         /*Samsung phone in firmware update mode */
1918         { USB_DEVICE(0x04e8, 0x685d),
1919         .driver_info = IGNORE_DEVICE,
1920         },
1921
1922         /* Exclude Infineon Flash Loader utility */
1923         { USB_DEVICE(0x058b, 0x0041),
1924         .driver_info = IGNORE_DEVICE,
1925         },
1926
1927         /* Exclude ETAS ES58x */
1928         { USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
1929         .driver_info = IGNORE_DEVICE,
1930         },
1931         { USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
1932         .driver_info = IGNORE_DEVICE,
1933         },
1934         { USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
1935         .driver_info = IGNORE_DEVICE,
1936         },
1937
1938         { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1939         .driver_info = SEND_ZERO_PACKET,
1940         },
1941         { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1942         .driver_info = SEND_ZERO_PACKET,
1943         },
1944
1945         /* Exclude Goodix Fingerprint Reader */
1946         { USB_DEVICE(0x27c6, 0x5395),
1947         .driver_info = IGNORE_DEVICE,
1948         },
1949
1950         /* Exclude Heimann Sensor GmbH USB appset demo */
1951         { USB_DEVICE(0x32a7, 0x0000),
1952         .driver_info = IGNORE_DEVICE,
1953         },
1954
1955         /* control interfaces without any protocol set */
1956         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1957                 USB_CDC_PROTO_NONE) },
1958
1959         /* control interfaces with various AT-command sets */
1960         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1961                 USB_CDC_ACM_PROTO_AT_V25TER) },
1962         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1963                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1964         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1965                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1966         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1967                 USB_CDC_ACM_PROTO_AT_GSM) },
1968         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1969                 USB_CDC_ACM_PROTO_AT_3G) },
1970         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1971                 USB_CDC_ACM_PROTO_AT_CDMA) },
1972
1973         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1974         .driver_info = SEND_ZERO_PACKET,
1975         },
1976
1977         { }
1978 };
1979
1980 MODULE_DEVICE_TABLE(usb, acm_ids);
1981
1982 static struct usb_driver acm_driver = {
1983         .name =         "cdc_acm",
1984         .probe =        acm_probe,
1985         .disconnect =   acm_disconnect,
1986 #ifdef CONFIG_PM
1987         .suspend =      acm_suspend,
1988         .resume =       acm_resume,
1989         .reset_resume = acm_reset_resume,
1990 #endif
1991         .id_table =     acm_ids,
1992 #ifdef CONFIG_PM
1993         .supports_autosuspend = 1,
1994 #endif
1995         .disable_hub_initiated_lpm = 1,
1996 };
1997
1998 /*
1999  * TTY driver structures.
2000  */
2001
2002 static const struct tty_operations acm_ops = {
2003         .install =              acm_tty_install,
2004         .open =                 acm_tty_open,
2005         .close =                acm_tty_close,
2006         .cleanup =              acm_tty_cleanup,
2007         .hangup =               acm_tty_hangup,
2008         .write =                acm_tty_write,
2009         .write_room =           acm_tty_write_room,
2010         .ioctl =                acm_tty_ioctl,
2011         .throttle =             acm_tty_throttle,
2012         .unthrottle =           acm_tty_unthrottle,
2013         .chars_in_buffer =      acm_tty_chars_in_buffer,
2014         .break_ctl =            acm_tty_break_ctl,
2015         .set_termios =          acm_tty_set_termios,
2016         .tiocmget =             acm_tty_tiocmget,
2017         .tiocmset =             acm_tty_tiocmset,
2018 };
2019
2020 /*
2021  * Init / exit.
2022  */
2023
2024 static int __init acm_init(void)
2025 {
2026         int retval;
2027         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
2028         if (!acm_tty_driver)
2029                 return -ENOMEM;
2030         acm_tty_driver->driver_name = "acm",
2031         acm_tty_driver->name = "ttyACM",
2032         acm_tty_driver->major = ACM_TTY_MAJOR,
2033         acm_tty_driver->minor_start = 0,
2034         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2035         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2036         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2037         acm_tty_driver->init_termios = tty_std_termios;
2038         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2039                                                                 HUPCL | CLOCAL;
2040         tty_set_operations(acm_tty_driver, &acm_ops);
2041
2042         retval = tty_register_driver(acm_tty_driver);
2043         if (retval) {
2044                 put_tty_driver(acm_tty_driver);
2045                 return retval;
2046         }
2047
2048         retval = usb_register(&acm_driver);
2049         if (retval) {
2050                 tty_unregister_driver(acm_tty_driver);
2051                 put_tty_driver(acm_tty_driver);
2052                 return retval;
2053         }
2054
2055         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2056
2057         return 0;
2058 }
2059
2060 static void __exit acm_exit(void)
2061 {
2062         usb_deregister(&acm_driver);
2063         tty_unregister_driver(acm_tty_driver);
2064         put_tty_driver(acm_tty_driver);
2065         idr_destroy(&acm_minors);
2066 }
2067
2068 module_init(acm_init);
2069 module_exit(acm_exit);
2070
2071 MODULE_AUTHOR(DRIVER_AUTHOR);
2072 MODULE_DESCRIPTION(DRIVER_DESC);
2073 MODULE_LICENSE("GPL");
2074 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);