drivers/usb/class/cdc-acm.c

   1 /*
   2  * cdc-acm.c
   3  *
   4  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
   5  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
   6  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
   7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   8  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
   9  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
  10  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
  11  *
  12  * USB Abstract Control Model driver for USB modems and ISDN adapters
  13  *
  14  * Sponsored by SuSE
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  29  */
  30
  31 #undef DEBUG
  32 #undef VERBOSE_DEBUG
  33
  34 #include <linux/kernel.h>
  35 #include <linux/errno.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/tty.h>
  39 #include <linux/serial.h>
  40 #include <linux/tty_driver.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/module.h>
  43 #include <linux/mutex.h>
  44 #include <linux/uaccess.h>
  45 #include <linux/usb.h>
  46 #include <linux/usb/cdc.h>
  47 #include <asm/byteorder.h>
  48 #include <asm/unaligned.h>
  49 #include <linux/list.h>
  50
  51 #include "cdc-acm.h"
  52
  53
  54 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  55 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  56
  57 static struct usb_driver acm_driver;
  58 static struct tty_driver *acm_tty_driver;
  59 static struct acm *acm_table[ACM_TTY_MINORS];
  60
  61 static DEFINE_MUTEX(open_mutex);
  62
  63 #define ACM_READY(acm)  (acm && acm->dev && acm->port.count)
  64
  65 static const struct tty_port_operations acm_port_ops = {
  66 };
  67
  68 /*
  69  * Functions for ACM control messages.
  70  */
  71
  72 static int acm_ctrl_msg(struct acm *acm, int request, int value,
  73                                                         void *buf, int len)
  74 {
  75         int retval;
  76
  77         retval = usb_autopm_get_interface(acm->control);
  78         if (retval)
  79                 return retval;
  80
  81         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
  82                 request, USB_RT_ACM, value,
  83                 acm->control->altsetting[0].desc.bInterfaceNumber,
  84                 buf, len, 5000);
  85
  86         dev_dbg(&acm->control->dev,
  87                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
  88                         __func__, request, value, len, retval);
  89
  90         usb_autopm_put_interface(acm->control);
  91
  92         return retval < 0 ? retval : 0;
  93 }
  94
  95 /* devices aren't required to support these requests.
  96  * the cdc acm descriptor tells whether they do...
  97  */
  98 #define acm_set_control(acm, control) \
  99         acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
 100 #define acm_set_line(acm, line) \
 101         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 102 #define acm_send_break(acm, ms) \
 103         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 104
 105 /*
 106  * Write buffer management.
 107  * All of these assume proper locks taken by the caller.
 108  */
 109
 110 static int acm_wb_alloc(struct acm *acm)
 111 {
 112         int i, wbn;
 113         struct acm_wb *wb;
 114
 115         wbn = 0;
 116         i = 0;
 117         for (;;) {
 118                 wb = &acm->wb[wbn];
 119                 if (!wb->use) {
 120                         wb->use = 1;
 121                         return wbn;
 122                 }
 123                 wbn = (wbn + 1) % ACM_NW;
 124                 if (++i >= ACM_NW)
 125                         return -1;
 126         }
 127 }
 128
 129 static int acm_wb_is_avail(struct acm *acm)
 130 {
 131         int i, n;
 132         unsigned long flags;
 133
 134         n = ACM_NW;
 135         spin_lock_irqsave(&acm->write_lock, flags);
 136         for (i = 0; i < ACM_NW; i++)
 137                 n -= acm->wb[i].use;
 138         spin_unlock_irqrestore(&acm->write_lock, flags);
 139         return n;
 140 }
 141
 142 /*
 143  * Finish write. Caller must hold acm->write_lock
 144  */
 145 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 146 {
 147         wb->use = 0;
 148         acm->transmitting--;
 149         usb_autopm_put_interface_async(acm->control);
 150 }
 151
 152 /*
 153  * Poke write.
 154  *
 155  * the caller is responsible for locking
 156  */
 157
 158 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 159 {
 160         int rc;
 161
 162         acm->transmitting++;
 163
 164         wb->urb->transfer_buffer = wb->buf;
 165         wb->urb->transfer_dma = wb->dmah;
 166         wb->urb->transfer_buffer_length = wb->len;
 167         wb->urb->dev = acm->dev;
 168
 169         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 170         if (rc < 0) {
 171                 dev_err(&acm->data->dev,
 172                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 173                         __func__, rc);
 174                 acm_write_done(acm, wb);
 175         }
 176         return rc;
 177 }
 178
 179 static int acm_write_start(struct acm *acm, int wbn)
 180 {
 181         unsigned long flags;
 182         struct acm_wb *wb = &acm->wb[wbn];
 183         int rc;
 184
 185         spin_lock_irqsave(&acm->write_lock, flags);
 186         if (!acm->dev) {
 187                 wb->use = 0;
 188                 spin_unlock_irqrestore(&acm->write_lock, flags);
 189                 return -ENODEV;
 190         }
 191
 192         dev_vdbg(&acm->data->dev, "%s - susp_count %d\n", __func__,
 193                                                         acm->susp_count);
 194         rc = usb_autopm_get_interface_async(acm->control);
 195         if (rc) {
 196                 wb->use = 0;
 197                 spin_unlock_irqrestore(&acm->write_lock, flags);
 198                 return rc;
 199         }
 200
 201         if (acm->susp_count) {
 202                 usb_anchor_urb(wb->urb, &acm->delayed);
 203                 spin_unlock_irqrestore(&acm->write_lock, flags);
 204                 return 0;
 205         }
 206         usb_mark_last_busy(acm->dev);
 207
 208         rc = acm_start_wb(acm, wb);
 209         spin_unlock_irqrestore(&acm->write_lock, flags);
 210
 211         return rc;
 212
 213 }
 214 /*
 215  * attributes exported through sysfs
 216  */
 217 static ssize_t show_caps
 218 (struct device *dev, struct device_attribute *attr, char *buf)
 219 {
 220         struct usb_interface *intf = to_usb_interface(dev);
 221         struct acm *acm = usb_get_intfdata(intf);
 222
 223         return sprintf(buf, "%d", acm->ctrl_caps);
 224 }
 225 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 226
 227 static ssize_t show_country_codes
 228 (struct device *dev, struct device_attribute *attr, char *buf)
 229 {
 230         struct usb_interface *intf = to_usb_interface(dev);
 231         struct acm *acm = usb_get_intfdata(intf);
 232
 233         memcpy(buf, acm->country_codes, acm->country_code_size);
 234         return acm->country_code_size;
 235 }
 236
 237 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 238
 239 static ssize_t show_country_rel_date
 240 (struct device *dev, struct device_attribute *attr, char *buf)
 241 {
 242         struct usb_interface *intf = to_usb_interface(dev);
 243         struct acm *acm = usb_get_intfdata(intf);
 244
 245         return sprintf(buf, "%d", acm->country_rel_date);
 246 }
 247
 248 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 249 /*
 250  * Interrupt handlers for various ACM device responses
 251  */
 252
 253 /* control interface reports status changes with "interrupt" transfers */
 254 static void acm_ctrl_irq(struct urb *urb)
 255 {
 256         struct acm *acm = urb->context;
 257         struct usb_cdc_notification *dr = urb->transfer_buffer;
 258         struct tty_struct *tty;
 259         unsigned char *data;
 260         int newctrl;
 261         int retval;
 262         int status = urb->status;
 263
 264         switch (status) {
 265         case 0:
 266                 /* success */
 267                 break;
 268         case -ECONNRESET:
 269         case -ENOENT:
 270         case -ESHUTDOWN:
 271                 /* this urb is terminated, clean up */
 272                 dev_dbg(&acm->control->dev,
 273                                 "%s - urb shutting down with status: %d\n",
 274                                 __func__, status);
 275                 return;
 276         default:
 277                 dev_dbg(&acm->control->dev,
 278                                 "%s - nonzero urb status received: %d\n",
 279                                 __func__, status);
 280                 goto exit;
 281         }
 282
 283         if (!ACM_READY(acm))
 284                 goto exit;
 285
 286         usb_mark_last_busy(acm->dev);
 287
 288         data = (unsigned char *)(dr + 1);
 289         switch (dr->bNotificationType) {
 290         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 291                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
 292                                                         __func__, dr->wValue);
 293                 break;
 294
 295         case USB_CDC_NOTIFY_SERIAL_STATE:
 296                 tty = tty_port_tty_get(&acm->port);
 297                 newctrl = get_unaligned_le16(data);
 298
 299                 if (tty) {
 300                         if (!acm->clocal &&
 301                                 (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 302                                 dev_dbg(&acm->control->dev,
 303                                         "%s - calling hangup\n", __func__);
 304                                 tty_hangup(tty);
 305                         }
 306                         tty_kref_put(tty);
 307                 }
 308
 309                 acm->ctrlin = newctrl;
 310
 311                 dev_dbg(&acm->control->dev,
 312                         "%s - input control lines: dcd%c dsr%c break%c "
 313                         "ring%c framing%c parity%c overrun%c\n",
 314                         __func__,
 315                         acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
 316                         acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
 317                         acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
 318                         acm->ctrlin & ACM_CTRL_RI  ? '+' : '-',
 319                         acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
 320                         acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
 321                         acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
 322                         break;
 323
 324         default:
 325                 dev_dbg(&acm->control->dev,
 326                         "%s - unknown notification %d received: index %d "
 327                         "len %d data0 %d data1 %d\n",
 328                         __func__,
 329                         dr->bNotificationType, dr->wIndex,
 330                         dr->wLength, data[0], data[1]);
 331                 break;
 332         }
 333 exit:
 334         retval = usb_submit_urb(urb, GFP_ATOMIC);
 335         if (retval)
 336                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 337                                                         __func__, retval);
 338 }
 339
 340 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 341 {
 342         int res;
 343
 344         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 345                 return 0;
 346
 347         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
 348
 349         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 350         if (res) {
 351                 if (res != -EPERM) {
 352                         dev_err(&acm->data->dev,
 353                                         "%s - usb_submit_urb failed: %d\n",
 354                                         __func__, res);
 355                 }
 356                 set_bit(index, &acm->read_urbs_free);
 357                 return res;
 358         }
 359
 360         return 0;
 361 }
 362
 363 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 364 {
 365         int res;
 366         int i;
 367
 368         for (i = 0; i < acm->rx_buflimit; ++i) {
 369                 res = acm_submit_read_urb(acm, i, mem_flags);
 370                 if (res)
 371                         return res;
 372         }
 373
 374         return 0;
 375 }
 376
 377 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 378 {
 379         struct tty_struct *tty;
 380
 381         if (!urb->actual_length)
 382                 return;
 383
 384         tty = tty_port_tty_get(&acm->port);
 385         if (!tty)
 386                 return;
 387
 388         tty_insert_flip_string(tty, urb->transfer_buffer, urb->actual_length);
 389         tty_flip_buffer_push(tty);
 390
 391         tty_kref_put(tty);
 392 }
 393
 394 static void acm_read_bulk_callback(struct urb *urb)
 395 {
 396         struct acm_rb *rb = urb->context;
 397         struct acm *acm = rb->instance;
 398         unsigned long flags;
 399
 400         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
 401                                         rb->index, urb->actual_length);
 402         set_bit(rb->index, &acm->read_urbs_free);
 403
 404         if (!acm->dev) {
 405                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 406                 return;
 407         }
 408         usb_mark_last_busy(acm->dev);
 409
 410         if (urb->status) {
 411                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
 412                                                         __func__, urb->status);
 413                 return;
 414         }
 415         acm_process_read_urb(acm, urb);
 416
 417         /* throttle device if requested by tty */
 418         spin_lock_irqsave(&acm->read_lock, flags);
 419         acm->throttled = acm->throttle_req;
 420         if (!acm->throttled && !acm->susp_count) {
 421                 spin_unlock_irqrestore(&acm->read_lock, flags);
 422                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 423         } else {
 424                 spin_unlock_irqrestore(&acm->read_lock, flags);
 425         }
 426 }
 427
 428 /* data interface wrote those outgoing bytes */
 429 static void acm_write_bulk(struct urb *urb)
 430 {
 431         struct acm_wb *wb = urb->context;
 432         struct acm *acm = wb->instance;
 433         unsigned long flags;
 434
 435         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
 436                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
 437                         __func__,
 438                         urb->actual_length,
 439                         urb->transfer_buffer_length,
 440                         urb->status);
 441
 442         spin_lock_irqsave(&acm->write_lock, flags);
 443         acm_write_done(acm, wb);
 444         spin_unlock_irqrestore(&acm->write_lock, flags);
 445         if (ACM_READY(acm))
 446                 schedule_work(&acm->work);
 447 }
 448
 449 static void acm_softint(struct work_struct *work)
 450 {
 451         struct acm *acm = container_of(work, struct acm, work);
 452         struct tty_struct *tty;
 453
 454         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 455
 456         if (!ACM_READY(acm))
 457                 return;
 458         tty = tty_port_tty_get(&acm->port);
 459         if (!tty)
 460                 return;
 461         tty_wakeup(tty);
 462         tty_kref_put(tty);
 463 }
 464
 465 /*
 466  * TTY handlers
 467  */
 468
 469 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 470 {
 471         struct acm *acm;
 472         int rv = -ENODEV;
 473
 474         mutex_lock(&open_mutex);
 475
 476         acm = acm_table[tty->index];
 477         if (!acm || !acm->dev)
 478                 goto out;
 479         else
 480                 rv = 0;
 481
 482         dev_dbg(&acm->control->dev, "%s\n", __func__);
 483
 484         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 485
 486         tty->driver_data = acm;
 487         tty_port_tty_set(&acm->port, tty);
 488
 489         if (usb_autopm_get_interface(acm->control) < 0)
 490                 goto early_bail;
 491         else
 492                 acm->control->needs_remote_wakeup = 1;
 493
 494         mutex_lock(&acm->mutex);
 495         if (acm->port.count++) {
 496                 mutex_unlock(&acm->mutex);
 497                 usb_autopm_put_interface(acm->control);
 498                 goto out;
 499         }
 500
 501         acm->ctrlurb->dev = acm->dev;
 502         if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
 503                 dev_err(&acm->control->dev,
 504                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 505                 goto bail_out;
 506         }
 507
 508         if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS) &&
 509             (acm->ctrl_caps & USB_CDC_CAP_LINE))
 510                 goto bail_out;
 511
 512         usb_autopm_put_interface(acm->control);
 513
 514         /*
 515          * Unthrottle device in case the TTY was closed while throttled.
 516          */
 517         spin_lock_irq(&acm->read_lock);
 518         acm->throttled = 0;
 519         acm->throttle_req = 0;
 520         spin_unlock_irq(&acm->read_lock);
 521
 522         if (acm_submit_read_urbs(acm, GFP_KERNEL))
 523                 goto bail_out;
 524
 525         set_bit(ASYNCB_INITIALIZED, &acm->port.flags);
 526         rv = tty_port_block_til_ready(&acm->port, tty, filp);
 527
 528         mutex_unlock(&acm->mutex);
 529 out:
 530         mutex_unlock(&open_mutex);
 531         return rv;
 532
 533 bail_out:
 534         acm->port.count--;
 535         mutex_unlock(&acm->mutex);
 536         usb_autopm_put_interface(acm->control);
 537 early_bail:
 538         mutex_unlock(&open_mutex);
 539         tty_port_tty_set(&acm->port, NULL);
 540         return -EIO;
 541 }
 542
 543 static void acm_tty_unregister(struct acm *acm)
 544 {
 545         int i;
 546
 547         tty_unregister_device(acm_tty_driver, acm->minor);
 548         usb_put_intf(acm->control);
 549         acm_table[acm->minor] = NULL;
 550         usb_free_urb(acm->ctrlurb);
 551         for (i = 0; i < ACM_NW; i++)
 552                 usb_free_urb(acm->wb[i].urb);
 553         for (i = 0; i < acm->rx_buflimit; i++)
 554                 usb_free_urb(acm->read_urbs[i]);
 555         kfree(acm->country_codes);
 556         kfree(acm);
 557 }
 558
 559 static void acm_port_down(struct acm *acm)
 560 {
 561         struct urb *urb;
 562         struct acm_wb *wb;
 563         int i;
 564
 565         if (acm->dev) {
 566                 usb_autopm_get_interface(acm->control);
 567                 acm_set_control(acm, acm->ctrlout = 0);
 568
 569                 for (;;) {
 570                         urb = usb_get_from_anchor(&acm->delayed);
 571                         if (!urb)
 572                                 break;
 573                         wb = urb->context;
 574                         wb->use = 0;
 575                         usb_autopm_put_interface_async(acm->control);
 576                 }
 577
 578                 usb_kill_urb(acm->ctrlurb);
 579                 for (i = 0; i < ACM_NW; i++)
 580                         usb_kill_urb(acm->wb[i].urb);
 581                 for (i = 0; i < acm->rx_buflimit; i++)
 582                         usb_kill_urb(acm->read_urbs[i]);
 583                 acm->control->needs_remote_wakeup = 0;
 584                 usb_autopm_put_interface(acm->control);
 585         }
 586 }
 587
 588 static void acm_tty_hangup(struct tty_struct *tty)
 589 {
 590         struct acm *acm;
 591
 592         mutex_lock(&open_mutex);
 593         acm = tty->driver_data;
 594
 595         if (!acm)
 596                 goto out;
 597
 598         tty_port_hangup(&acm->port);
 599         acm_port_down(acm);
 600
 601 out:
 602         mutex_unlock(&open_mutex);
 603 }
 604
 605 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 606 {
 607         struct acm *acm = tty->driver_data;
 608
 609         /* Perform the closing process and see if we need to do the hardware
 610            shutdown */
 611         if (!acm)
 612                 return;
 613
 614         mutex_lock(&open_mutex);
 615         if (tty_port_close_start(&acm->port, tty, filp) == 0) {
 616                 if (!acm->dev) {
 617                         tty_port_tty_set(&acm->port, NULL);
 618                         acm_tty_unregister(acm);
 619                         tty->driver_data = NULL;
 620                 }
 621                 mutex_unlock(&open_mutex);
 622                 return;
 623         }
 624         acm_port_down(acm);
 625         tty_port_close_end(&acm->port, tty);
 626         tty_port_tty_set(&acm->port, NULL);
 627         mutex_unlock(&open_mutex);
 628 }
 629
 630 static int acm_tty_write(struct tty_struct *tty,
 631                                         const unsigned char *buf, int count)
 632 {
 633         struct acm *acm = tty->driver_data;
 634         int stat;
 635         unsigned long flags;
 636         int wbn;
 637         struct acm_wb *wb;
 638
 639         if (!ACM_READY(acm))
 640                 return -EINVAL;
 641         if (!count)
 642                 return 0;
 643
 644         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 645
 646         spin_lock_irqsave(&acm->write_lock, flags);
 647         wbn = acm_wb_alloc(acm);
 648         if (wbn < 0) {
 649                 spin_unlock_irqrestore(&acm->write_lock, flags);
 650                 return 0;
 651         }
 652         wb = &acm->wb[wbn];
 653
 654         count = (count > acm->writesize) ? acm->writesize : count;
 655         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 656         memcpy(wb->buf, buf, count);
 657         wb->len = count;
 658         spin_unlock_irqrestore(&acm->write_lock, flags);
 659
 660         stat = acm_write_start(acm, wbn);
 661         if (stat < 0)
 662                 return stat;
 663         return count;
 664 }
 665
 666 static int acm_tty_write_room(struct tty_struct *tty)
 667 {
 668         struct acm *acm = tty->driver_data;
 669         if (!ACM_READY(acm))
 670                 return -EINVAL;
 671         /*
 672          * Do not let the line discipline to know that we have a reserve,
 673          * or it might get too enthusiastic.
 674          */
 675         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 676 }
 677
 678 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 679 {
 680         struct acm *acm = tty->driver_data;
 681         if (!ACM_READY(acm))
 682                 return 0;
 683         /*
 684          * This is inaccurate (overcounts), but it works.
 685          */
 686         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 687 }
 688
 689 static void acm_tty_throttle(struct tty_struct *tty)
 690 {
 691         struct acm *acm = tty->driver_data;
 692
 693         if (!ACM_READY(acm))
 694                 return;
 695
 696         spin_lock_irq(&acm->read_lock);
 697         acm->throttle_req = 1;
 698         spin_unlock_irq(&acm->read_lock);
 699 }
 700
 701 static void acm_tty_unthrottle(struct tty_struct *tty)
 702 {
 703         struct acm *acm = tty->driver_data;
 704         unsigned int was_throttled;
 705
 706         if (!ACM_READY(acm))
 707                 return;
 708
 709         spin_lock_irq(&acm->read_lock);
 710         was_throttled = acm->throttled;
 711         acm->throttled = 0;
 712         acm->throttle_req = 0;
 713         spin_unlock_irq(&acm->read_lock);
 714
 715         if (was_throttled)
 716                 acm_submit_read_urbs(acm, GFP_KERNEL);
 717 }
 718
 719 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 720 {
 721         struct acm *acm = tty->driver_data;
 722         int retval;
 723         if (!ACM_READY(acm))
 724                 return -EINVAL;
 725         retval = acm_send_break(acm, state ? 0xffff : 0);
 726         if (retval < 0)
 727                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 728                                                                 __func__);
 729         return retval;
 730 }
 731
 732 static int acm_tty_tiocmget(struct tty_struct *tty)
 733 {
 734         struct acm *acm = tty->driver_data;
 735
 736         if (!ACM_READY(acm))
 737                 return -EINVAL;
 738
 739         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 740                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 741                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 742                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 743                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 744                TIOCM_CTS;
 745 }
 746
 747 static int acm_tty_tiocmset(struct tty_struct *tty,
 748                             unsigned int set, unsigned int clear)
 749 {
 750         struct acm *acm = tty->driver_data;
 751         unsigned int newctrl;
 752
 753         if (!ACM_READY(acm))
 754                 return -EINVAL;
 755
 756         newctrl = acm->ctrlout;
 757         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 758                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 759         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 760                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 761
 762         newctrl = (newctrl & ~clear) | set;
 763
 764         if (acm->ctrlout == newctrl)
 765                 return 0;
 766         return acm_set_control(acm, acm->ctrlout = newctrl);
 767 }
 768
 769 static int acm_tty_ioctl(struct tty_struct *tty,
 770                                         unsigned int cmd, unsigned long arg)
 771 {
 772         struct acm *acm = tty->driver_data;
 773
 774         if (!ACM_READY(acm))
 775                 return -EINVAL;
 776
 777         return -ENOIOCTLCMD;
 778 }
 779
 780 static const __u32 acm_tty_speed[] = {
 781         0, 50, 75, 110, 134, 150, 200, 300, 600,
 782         1200, 1800, 2400, 4800, 9600, 19200, 38400,
 783         57600, 115200, 230400, 460800, 500000, 576000,
 784         921600, 1000000, 1152000, 1500000, 2000000,
 785         2500000, 3000000, 3500000, 4000000
 786 };
 787
 788 static void acm_tty_set_termios(struct tty_struct *tty,
 789                                                 struct ktermios *termios_old)
 790 {
 791         struct acm *acm = tty->driver_data;
 792         struct ktermios *termios = tty->termios;
 793         struct usb_cdc_line_coding newline;
 794         int newctrl = acm->ctrlout;
 795
 796         if (!ACM_READY(acm))
 797                 return;
 798
 799         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 800         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 801         newline.bParityType = termios->c_cflag & PARENB ?
 802                                 (termios->c_cflag & PARODD ? 1 : 2) +
 803                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 804         switch (termios->c_cflag & CSIZE) {
 805         case CS5:
 806                 newline.bDataBits = 5;
 807                 break;
 808         case CS6:
 809                 newline.bDataBits = 6;
 810                 break;
 811         case CS7:
 812                 newline.bDataBits = 7;
 813                 break;
 814         case CS8:
 815         default:
 816                 newline.bDataBits = 8;
 817                 break;
 818         }
 819         /* FIXME: Needs to clear unsupported bits in the termios */
 820         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 821
 822         if (C_BAUD(tty) == B0) {
 823                 newline.dwDTERate = acm->line.dwDTERate;
 824                 newctrl &= ~ACM_CTRL_DTR;
 825         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
 826                 newctrl |=  ACM_CTRL_DTR;
 827         }
 828
 829         if (newctrl != acm->ctrlout)
 830                 acm_set_control(acm, acm->ctrlout = newctrl);
 831
 832         if (memcmp(&acm->line, &newline, sizeof newline)) {
 833                 memcpy(&acm->line, &newline, sizeof newline);
 834                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 835                         __func__,
 836                         le32_to_cpu(newline.dwDTERate),
 837                         newline.bCharFormat, newline.bParityType,
 838                         newline.bDataBits);
 839                 acm_set_line(acm, &acm->line);
 840         }
 841 }
 842
 843 /*
 844  * USB probe and disconnect routines.
 845  */
 846
 847 /* Little helpers: write/read buffers free */
 848 static void acm_write_buffers_free(struct acm *acm)
 849 {
 850         int i;
 851         struct acm_wb *wb;
 852         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 853
 854         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
 855                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
 856 }
 857
 858 static void acm_read_buffers_free(struct acm *acm)
 859 {
 860         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 861         int i;
 862
 863         for (i = 0; i < acm->rx_buflimit; i++)
 864                 usb_free_coherent(usb_dev, acm->readsize,
 865                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
 866 }
 867
 868 /* Little helper: write buffers allocate */
 869 static int acm_write_buffers_alloc(struct acm *acm)
 870 {
 871         int i;
 872         struct acm_wb *wb;
 873
 874         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
 875                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
 876                     &wb->dmah);
 877                 if (!wb->buf) {
 878                         while (i != 0) {
 879                                 --i;
 880                                 --wb;
 881                                 usb_free_coherent(acm->dev, acm->writesize,
 882                                     wb->buf, wb->dmah);
 883                         }
 884                         return -ENOMEM;
 885                 }
 886         }
 887         return 0;
 888 }
 889
 890 static int acm_probe(struct usb_interface *intf,
 891                      const struct usb_device_id *id)
 892 {
 893         struct usb_cdc_union_desc *union_header = NULL;
 894         struct usb_cdc_country_functional_desc *cfd = NULL;
 895         unsigned char *buffer = intf->altsetting->extra;
 896         int buflen = intf->altsetting->extralen;
 897         struct usb_interface *control_interface;
 898         struct usb_interface *data_interface;
 899         struct usb_endpoint_descriptor *epctrl = NULL;
 900         struct usb_endpoint_descriptor *epread = NULL;
 901         struct usb_endpoint_descriptor *epwrite = NULL;
 902         struct usb_device *usb_dev = interface_to_usbdev(intf);
 903         struct acm *acm;
 904         int minor;
 905         int ctrlsize, readsize;
 906         u8 *buf;
 907         u8 ac_management_function = 0;
 908         u8 call_management_function = 0;
 909         int call_interface_num = -1;
 910         int data_interface_num = -1;
 911         unsigned long quirks;
 912         int num_rx_buf;
 913         int i;
 914         unsigned int elength = 0;
 915         int combined_interfaces = 0;
 916
 917         /* normal quirks */
 918         quirks = (unsigned long)id->driver_info;
 919
 920         if (quirks == IGNORE_DEVICE)
 921                 return -ENODEV;
 922
 923         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
 924
 925         /* handle quirks deadly to normal probing*/
 926         if (quirks == NO_UNION_NORMAL) {
 927                 data_interface = usb_ifnum_to_if(usb_dev, 1);
 928                 control_interface = usb_ifnum_to_if(usb_dev, 0);
 929                 goto skip_normal_probe;
 930         }
 931
 932         /* normal probing*/
 933         if (!buffer) {
 934                 dev_err(&intf->dev, "Weird descriptor references\n");
 935                 return -EINVAL;
 936         }
 937
 938         if (!buflen) {
 939                 if (intf->cur_altsetting->endpoint &&
 940                                 intf->cur_altsetting->endpoint->extralen &&
 941                                 intf->cur_altsetting->endpoint->extra) {
 942                         dev_dbg(&intf->dev,
 943                                 "Seeking extra descriptors on endpoint\n");
 944                         buflen = intf->cur_altsetting->endpoint->extralen;
 945                         buffer = intf->cur_altsetting->endpoint->extra;
 946                 } else {
 947                         dev_err(&intf->dev,
 948                                 "Zero length descriptor references\n");
 949                         return -EINVAL;
 950                 }
 951         }
 952
 953         while (buflen > 0) {
 954                 elength = buffer[0];
 955                 if (!elength) {
 956                         dev_err(&intf->dev, "skipping garbage byte\n");
 957                         elength = 1;
 958                         goto next_desc;
 959                 }
 960                 if (buffer[1] != USB_DT_CS_INTERFACE) {
 961                         dev_err(&intf->dev, "skipping garbage\n");
 962                         goto next_desc;
 963                 }
 964
 965                 switch (buffer[2]) {
 966                 case USB_CDC_UNION_TYPE: /* we've found it */
 967                         if (elength < sizeof(struct usb_cdc_union_desc))
 968                                 goto next_desc;
 969                         if (union_header) {
 970                                 dev_err(&intf->dev, "More than one "
 971                                         "union descriptor, skipping ...\n");
 972                                 goto next_desc;
 973                         }
 974                         union_header = (struct usb_cdc_union_desc *)buffer;
 975                         break;
 976                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
 977                         if (elength < sizeof(struct usb_cdc_country_functional_desc))
 978                                 goto next_desc;
 979                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
 980                         break;
 981                 case USB_CDC_HEADER_TYPE: /* maybe check version */
 982                         break; /* for now we ignore it */
 983                 case USB_CDC_ACM_TYPE:
 984                         if (elength < 4)
 985                                 goto next_desc;
 986                         ac_management_function = buffer[3];
 987                         break;
 988                 case USB_CDC_CALL_MANAGEMENT_TYPE:
 989                         if (elength < 5)
 990                                 goto next_desc;
 991                         call_management_function = buffer[3];
 992                         call_interface_num = buffer[4];
 993                         if ( (quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
 994                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
 995                         break;
 996                 default:
 997                         /*
 998                          * there are LOTS more CDC descriptors that
 999                          * could legitimately be found here.
1000                          */
1001                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1002                                         "type %02x, length %ud\n",
1003                                         buffer[2], elength);
1004                         break;
1005                 }
1006 next_desc:
1007                 buflen -= elength;
1008                 buffer += elength;
1009         }
1010
1011         if (!union_header) {
1012                 if (call_interface_num > 0) {
1013                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1014                         /* quirks for Droids MuIn LCD */
1015                         if (quirks & NO_DATA_INTERFACE)
1016                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1017                         else
1018                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1019                         control_interface = intf;
1020                 } else {
1021                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1022                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1023                                 return -ENODEV;
1024                         } else {
1025                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1026                                 combined_interfaces = 1;
1027                                 control_interface = data_interface = intf;
1028                                 goto look_for_collapsed_interface;
1029                         }
1030                 }
1031         } else {
1032                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1033                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1034         }
1035
1036         if (!control_interface || !data_interface) {
1037                 dev_dbg(&intf->dev, "no interfaces\n");
1038                 return -ENODEV;
1039         }
1040
1041         if (data_interface_num != call_interface_num)
1042                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1043
1044         if (control_interface == data_interface) {
1045                 /* some broken devices designed for windows work this way */
1046                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1047                 combined_interfaces = 1;
1048                 /* a popular other OS doesn't use it */
1049                 quirks |= NO_CAP_LINE;
1050                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1051                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1052                         return -EINVAL;
1053                 }
1054 look_for_collapsed_interface:
1055                 for (i = 0; i < 3; i++) {
1056                         struct usb_endpoint_descriptor *ep;
1057                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1058
1059                         if (usb_endpoint_is_int_in(ep))
1060                                 epctrl = ep;
1061                         else if (usb_endpoint_is_bulk_out(ep))
1062                                 epwrite = ep;
1063                         else if (usb_endpoint_is_bulk_in(ep))
1064                                 epread = ep;
1065                         else
1066                                 return -EINVAL;
1067                 }
1068                 if (!epctrl || !epread || !epwrite)
1069                         return -ENODEV;
1070                 else
1071                         goto made_compressed_probe;
1072         }
1073
1074 skip_normal_probe:
1075
1076         /*workaround for switched interfaces */
1077         if (data_interface->cur_altsetting->desc.bInterfaceClass
1078                                                 != CDC_DATA_INTERFACE_TYPE) {
1079                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1080                                                 == CDC_DATA_INTERFACE_TYPE) {
1081                         struct usb_interface *t;
1082                         dev_dbg(&intf->dev,
1083                                 "Your device has switched interfaces.\n");
1084                         t = control_interface;
1085                         control_interface = data_interface;
1086                         data_interface = t;
1087                 } else {
1088                         return -EINVAL;
1089                 }
1090         }
1091
1092         /* Accept probe requests only for the control interface */
1093         if (!combined_interfaces && intf != control_interface)
1094                 return -ENODEV;
1095
1096         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1097                 /* valid in this context */
1098                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1099                 return -EBUSY;
1100         }
1101
1102
1103         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1104             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1105                 return -EINVAL;
1106
1107         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1108         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1109         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1110
1111
1112         /* workaround for switched endpoints */
1113         if (!usb_endpoint_dir_in(epread)) {
1114                 /* descriptors are swapped */
1115                 struct usb_endpoint_descriptor *t;
1116                 dev_dbg(&intf->dev,
1117                         "The data interface has switched endpoints\n");
1118                 t = epread;
1119                 epread = epwrite;
1120                 epwrite = t;
1121         }
1122 made_compressed_probe:
1123         dev_dbg(&intf->dev, "interfaces are valid\n");
1124         for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++);
1125
1126         if (minor == ACM_TTY_MINORS) {
1127                 dev_err(&intf->dev, "no more free acm devices\n");
1128                 return -ENODEV;
1129         }
1130
1131         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1132         if (acm == NULL) {
1133                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1134                 goto alloc_fail;
1135         }
1136
1137         ctrlsize = usb_endpoint_maxp(epctrl);
1138         readsize = usb_endpoint_maxp(epread) *
1139                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1140         acm->combined_interfaces = combined_interfaces;
1141         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1142         acm->control = control_interface;
1143         acm->data = data_interface;
1144         acm->minor = minor;
1145         acm->dev = usb_dev;
1146         acm->ctrl_caps = ac_management_function;
1147         if (quirks & NO_CAP_LINE)
1148                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1149         acm->ctrlsize = ctrlsize;
1150         acm->readsize = readsize;
1151         acm->rx_buflimit = num_rx_buf;
1152         INIT_WORK(&acm->work, acm_softint);
1153         spin_lock_init(&acm->write_lock);
1154         spin_lock_init(&acm->read_lock);
1155         mutex_init(&acm->mutex);
1156         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1157         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1158         if (acm->is_int_ep)
1159                 acm->bInterval = epread->bInterval;
1160         tty_port_init(&acm->port);
1161         acm->port.ops = &acm_port_ops;
1162         init_usb_anchor(&acm->delayed);
1163
1164         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1165         if (!buf) {
1166                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1167                 goto alloc_fail2;
1168         }
1169         acm->ctrl_buffer = buf;
1170
1171         if (acm_write_buffers_alloc(acm) < 0) {
1172                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1173                 goto alloc_fail4;
1174         }
1175
1176         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1177         if (!acm->ctrlurb) {
1178                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1179                 goto alloc_fail5;
1180         }
1181         for (i = 0; i < num_rx_buf; i++) {
1182                 struct acm_rb *rb = &(acm->read_buffers[i]);
1183                 struct urb *urb;
1184
1185                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1186                                                                 &rb->dma);
1187                 if (!rb->base) {
1188                         dev_err(&intf->dev, "out of memory "
1189                                         "(read bufs usb_alloc_coherent)\n");
1190                         goto alloc_fail6;
1191                 }
1192                 rb->index = i;
1193                 rb->instance = acm;
1194
1195                 urb = usb_alloc_urb(0, GFP_KERNEL);
1196                 if (!urb) {
1197                         dev_err(&intf->dev,
1198                                 "out of memory (read urbs usb_alloc_urb)\n");
1199                         goto alloc_fail6;
1200                 }
1201                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1202                 urb->transfer_dma = rb->dma;
1203                 if (acm->is_int_ep) {
1204                         usb_fill_int_urb(urb, acm->dev,
1205                                          acm->rx_endpoint,
1206                                          rb->base,
1207                                          acm->readsize,
1208                                          acm_read_bulk_callback, rb,
1209                                          acm->bInterval);
1210                 } else {
1211                         usb_fill_bulk_urb(urb, acm->dev,
1212                                           acm->rx_endpoint,
1213                                           rb->base,
1214                                           acm->readsize,
1215                                           acm_read_bulk_callback, rb);
1216                 }
1217
1218                 acm->read_urbs[i] = urb;
1219                 __set_bit(i, &acm->read_urbs_free);
1220         }
1221         for (i = 0; i < ACM_NW; i++) {
1222                 struct acm_wb *snd = &(acm->wb[i]);
1223
1224                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1225                 if (snd->urb == NULL) {
1226                         dev_err(&intf->dev,
1227                                 "out of memory (write urbs usb_alloc_urb)\n");
1228                         goto alloc_fail7;
1229                 }
1230
1231                 if (usb_endpoint_xfer_int(epwrite))
1232                         usb_fill_int_urb(snd->urb, usb_dev,
1233                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1234                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1235                 else
1236                         usb_fill_bulk_urb(snd->urb, usb_dev,
1237                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1238                                 NULL, acm->writesize, acm_write_bulk, snd);
1239                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1240                 if (quirks & SEND_ZERO_PACKET)
1241                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1242                 snd->instance = acm;
1243         }
1244
1245         usb_set_intfdata(intf, acm);
1246
1247         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1248         if (i < 0)
1249                 goto alloc_fail7;
1250
1251         if (cfd) { /* export the country data */
1252                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1253                 if (!acm->country_codes)
1254                         goto skip_countries;
1255                 acm->country_code_size = cfd->bLength - 4;
1256                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1257                                                         cfd->bLength - 4);
1258                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1259
1260                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1261                 if (i < 0) {
1262                         kfree(acm->country_codes);
1263                         acm->country_codes = NULL;
1264                         acm->country_code_size = 0;
1265                         goto skip_countries;
1266                 }
1267
1268                 i = device_create_file(&intf->dev,
1269                                                 &dev_attr_iCountryCodeRelDate);
1270                 if (i < 0) {
1271                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1272                         kfree(acm->country_codes);
1273                         acm->country_codes = NULL;
1274                         acm->country_code_size = 0;
1275                         goto skip_countries;
1276                 }
1277         }
1278
1279 skip_countries:
1280         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1281                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1282                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1283                          /* works around buggy devices */
1284                          epctrl->bInterval ? epctrl->bInterval : 0xff);
1285         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1286         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1287
1288         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1289
1290         acm_set_control(acm, acm->ctrlout);
1291
1292         acm->line.dwDTERate = cpu_to_le32(9600);
1293         acm->line.bDataBits = 8;
1294         acm_set_line(acm, &acm->line);
1295
1296         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1297         usb_set_intfdata(data_interface, acm);
1298
1299         usb_get_intf(control_interface);
1300         tty_register_device(acm_tty_driver, minor, &control_interface->dev);
1301
1302         acm_table[minor] = acm;
1303
1304         if (quirks & CLEAR_HALT_CONDITIONS) {
1305                 usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress));
1306                 usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress));
1307         }
1308
1309         return 0;
1310 alloc_fail7:
1311         for (i = 0; i < ACM_NW; i++)
1312                 usb_free_urb(acm->wb[i].urb);
1313 alloc_fail6:
1314         for (i = 0; i < num_rx_buf; i++)
1315                 usb_free_urb(acm->read_urbs[i]);
1316         acm_read_buffers_free(acm);
1317         usb_free_urb(acm->ctrlurb);
1318 alloc_fail5:
1319         acm_write_buffers_free(acm);
1320 alloc_fail4:
1321         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1322 alloc_fail2:
1323         kfree(acm);
1324 alloc_fail:
1325         return -ENOMEM;
1326 }
1327
1328 static void stop_data_traffic(struct acm *acm)
1329 {
1330         int i;
1331
1332         dev_dbg(&acm->control->dev, "%s\n", __func__);
1333
1334         usb_kill_urb(acm->ctrlurb);
1335         for (i = 0; i < ACM_NW; i++)
1336                 usb_kill_urb(acm->wb[i].urb);
1337         for (i = 0; i < acm->rx_buflimit; i++)
1338                 usb_kill_urb(acm->read_urbs[i]);
1339
1340         cancel_work_sync(&acm->work);
1341 }
1342
1343 static void acm_disconnect(struct usb_interface *intf)
1344 {
1345         struct acm *acm = usb_get_intfdata(intf);
1346         struct usb_device *usb_dev = interface_to_usbdev(intf);
1347         struct tty_struct *tty;
1348
1349         /* sibling interface is already cleaning up */
1350         if (!acm)
1351                 return;
1352
1353         mutex_lock(&open_mutex);
1354         if (acm->country_codes) {
1355                 device_remove_file(&acm->control->dev,
1356                                 &dev_attr_wCountryCodes);
1357                 device_remove_file(&acm->control->dev,
1358                                 &dev_attr_iCountryCodeRelDate);
1359         }
1360         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1361         acm->dev = NULL;
1362         usb_set_intfdata(acm->control, NULL);
1363         usb_set_intfdata(acm->data, NULL);
1364
1365         stop_data_traffic(acm);
1366
1367         acm_write_buffers_free(acm);
1368         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer,
1369                           acm->ctrl_dma);
1370         acm_read_buffers_free(acm);
1371
1372         if (!acm->combined_interfaces)
1373                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1374                                         acm->data : acm->control);
1375
1376         if (acm->port.count == 0) {
1377                 acm_tty_unregister(acm);
1378                 mutex_unlock(&open_mutex);
1379                 return;
1380         }
1381
1382         mutex_unlock(&open_mutex);
1383         tty = tty_port_tty_get(&acm->port);
1384         if (tty) {
1385                 tty_hangup(tty);
1386                 tty_kref_put(tty);
1387         }
1388 }
1389
1390 #ifdef CONFIG_PM
1391 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1392 {
1393         struct acm *acm = usb_get_intfdata(intf);
1394         int cnt;
1395
1396         spin_lock_irq(&acm->read_lock);
1397         spin_lock(&acm->write_lock);
1398         if (PMSG_IS_AUTO(message)) {
1399                 if (acm->transmitting) {
1400                         spin_unlock(&acm->write_lock);
1401                         spin_unlock_irq(&acm->read_lock);
1402                         return -EBUSY;
1403                 }
1404         }
1405         cnt = acm->susp_count++;
1406         spin_unlock(&acm->write_lock);
1407         spin_unlock_irq(&acm->read_lock);
1408
1409         if (cnt)
1410                 return 0;
1411         /*
1412         we treat opened interfaces differently,
1413         we must guard against open
1414         */
1415         mutex_lock(&acm->mutex);
1416
1417         if (acm->port.count)
1418                 stop_data_traffic(acm);
1419
1420         mutex_unlock(&acm->mutex);
1421         return 0;
1422 }
1423
1424 static int acm_resume(struct usb_interface *intf)
1425 {
1426         struct acm *acm = usb_get_intfdata(intf);
1427         struct urb *urb;
1428         int rv = 0;
1429
1430         mutex_lock(&acm->mutex);
1431         spin_lock_irq(&acm->read_lock);
1432         spin_lock(&acm->write_lock);
1433
1434         if (--acm->susp_count)
1435                 goto out;
1436
1437         if (acm->port.count) {
1438                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1439
1440                 for (;;) {
1441                         urb = usb_get_from_anchor(&acm->delayed);
1442                         if (!urb)
1443                                 break;
1444
1445                         acm_start_wb(acm, urb->context);
1446                 }
1447
1448                 /*
1449                  * delayed error checking because we must
1450                  * do the write path at all cost
1451                  */
1452                 if (rv < 0)
1453                         goto out;
1454
1455                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1456         }
1457 out:
1458         spin_unlock(&acm->write_lock);
1459         spin_unlock_irq(&acm->read_lock);
1460         mutex_unlock(&acm->mutex);
1461
1462         return rv;
1463 }
1464
1465 static int acm_reset_resume(struct usb_interface *intf)
1466 {
1467         struct acm *acm = usb_get_intfdata(intf);
1468         struct tty_struct *tty;
1469
1470         mutex_lock(&acm->mutex);
1471         if (acm->port.count) {
1472                 tty = tty_port_tty_get(&acm->port);
1473                 if (tty) {
1474                         tty_hangup(tty);
1475                         tty_kref_put(tty);
1476                 }
1477         }
1478         mutex_unlock(&acm->mutex);
1479         return acm_resume(intf);
1480 }
1481
1482 #endif /* CONFIG_PM */
1483
1484 #define NOKIA_PCSUITE_ACM_INFO(x) \
1485                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1486                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1487                 USB_CDC_ACM_PROTO_VENDOR)
1488
1489 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1490                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1491                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1492                 USB_CDC_ACM_PROTO_VENDOR)
1493
1494 /*
1495  * USB driver structure.
1496  */
1497
1498 static const struct usb_device_id acm_ids[] = {
1499         /* quirky and broken devices */
1500         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1501         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1502         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1503         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1504         },
1505         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1506         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1507         },
1508         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1509         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1510         },
1511         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1512         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1513         },
1514         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1515         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1516         },
1517         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1518         .driver_info = SINGLE_RX_URB,
1519         },
1520         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1521         .driver_info = SINGLE_RX_URB, /* firmware bug */
1522         },
1523         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1524         .driver_info = SINGLE_RX_URB, /* firmware bug */
1525         },
1526         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1527         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1528         },
1529         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1530         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1531         },
1532         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1533         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1534         },
1535         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1536         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1537         },
1538         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1539         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1540         },
1541         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1542         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1543         },
1544         /* Motorola H24 HSPA module: */
1545         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1546         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1547         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1548         },
1549         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1550         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1551         },
1552         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1553         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1554         },
1555         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1556         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1557         },
1558         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1559         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1560         },
1561         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1562         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1563         },
1564         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1565         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1566         },
1567
1568         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1569         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1570                                            data interface instead of
1571                                            communications interface.
1572                                            Maybe we should define a new
1573                                            quirk for this. */
1574         },
1575         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1576         .driver_info = NO_UNION_NORMAL,
1577         },
1578         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1579         .driver_info = NO_UNION_NORMAL,
1580         },
1581         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1582         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1583         },
1584         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1585         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1586         },
1587
1588         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1589         .driver_info = CLEAR_HALT_CONDITIONS,
1590         },
1591
1592         /* Nokia S60 phones expose two ACM channels. The first is
1593          * a modem and is picked up by the standard AT-command
1594          * information below. The second is 'vendor-specific' but
1595          * is treated as a serial device at the S60 end, so we want
1596          * to expose it on Linux too. */
1597         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1598         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1599         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1600         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1601         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1602         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1603         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1604         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1605         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1606         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1607         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1608         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1609         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1610         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1611         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1612         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1613         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1614         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1615         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1616         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1617         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1618         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1619         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1620         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1621         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1622         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1623         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1624         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1625         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1626         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1627         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1628         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1629         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1630         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1631         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1632         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1633         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1634         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1635         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1636         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1637         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1638         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1639         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1640         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1641         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1642         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1643         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1644         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1645         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1646         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1647         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1648         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1649         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1650         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1651         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1652         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1653         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1654         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1655
1656         /* Support for Owen devices */
1657         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1658
1659         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1660
1661         /* Support Lego NXT using pbLua firmware */
1662         { USB_DEVICE(0x0694, 0xff00),
1663         .driver_info = NOT_A_MODEM,
1664         },
1665
1666         /* Support for Droids MuIn LCD */
1667         { USB_DEVICE(0x04d8, 0x000b),
1668         .driver_info = NO_DATA_INTERFACE,
1669         },
1670
1671         /* Exclude Infineon Flash Loader utility */
1672         { USB_DEVICE(0x058b, 0x0041),
1673         .driver_info = IGNORE_DEVICE,
1674         },
1675
1676         /* control interfaces without any protocol set */
1677         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1678                 USB_CDC_PROTO_NONE) },
1679
1680         /* control interfaces with various AT-command sets */
1681         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1682                 USB_CDC_ACM_PROTO_AT_V25TER) },
1683         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1684                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1685         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1686                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1687         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1688                 USB_CDC_ACM_PROTO_AT_GSM) },
1689         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1690                 USB_CDC_ACM_PROTO_AT_3G) },
1691         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1692                 USB_CDC_ACM_PROTO_AT_CDMA) },
1693
1694         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1695         .driver_info = SEND_ZERO_PACKET,
1696         },
1697
1698         { }
1699 };
1700
1701 MODULE_DEVICE_TABLE(usb, acm_ids);
1702
1703 static struct usb_driver acm_driver = {
1704         .name =         "cdc_acm",
1705         .probe =        acm_probe,
1706         .disconnect =   acm_disconnect,
1707 #ifdef CONFIG_PM
1708         .suspend =      acm_suspend,
1709         .resume =       acm_resume,
1710         .reset_resume = acm_reset_resume,
1711 #endif
1712         .id_table =     acm_ids,
1713 #ifdef CONFIG_PM
1714         .supports_autosuspend = 1,
1715 #endif
1716 };
1717
1718 /*
1719  * TTY driver structures.
1720  */
1721
1722 static const struct tty_operations acm_ops = {
1723         .open =                 acm_tty_open,
1724         .close =                acm_tty_close,
1725         .hangup =               acm_tty_hangup,
1726         .write =                acm_tty_write,
1727         .write_room =           acm_tty_write_room,
1728         .ioctl =                acm_tty_ioctl,
1729         .throttle =             acm_tty_throttle,
1730         .unthrottle =           acm_tty_unthrottle,
1731         .chars_in_buffer =      acm_tty_chars_in_buffer,
1732         .break_ctl =            acm_tty_break_ctl,
1733         .set_termios =          acm_tty_set_termios,
1734         .tiocmget =             acm_tty_tiocmget,
1735         .tiocmset =             acm_tty_tiocmset,
1736 };
1737
1738 /*
1739  * Init / exit.
1740  */
1741
1742 static int __init acm_init(void)
1743 {
1744         int retval;
1745         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1746         if (!acm_tty_driver)
1747                 return -ENOMEM;
1748         acm_tty_driver->owner = THIS_MODULE,
1749         acm_tty_driver->driver_name = "acm",
1750         acm_tty_driver->name = "ttyACM",
1751         acm_tty_driver->major = ACM_TTY_MAJOR,
1752         acm_tty_driver->minor_start = 0,
1753         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1754         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1755         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1756         acm_tty_driver->init_termios = tty_std_termios;
1757         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1758                                                                 HUPCL | CLOCAL;
1759         tty_set_operations(acm_tty_driver, &acm_ops);
1760
1761         retval = tty_register_driver(acm_tty_driver);
1762         if (retval) {
1763                 put_tty_driver(acm_tty_driver);
1764                 return retval;
1765         }
1766
1767         retval = usb_register(&acm_driver);
1768         if (retval) {
1769                 tty_unregister_driver(acm_tty_driver);
1770                 put_tty_driver(acm_tty_driver);
1771                 return retval;
1772         }
1773
1774         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1775
1776         return 0;
1777 }
1778
1779 static void __exit acm_exit(void)
1780 {
1781         usb_deregister(&acm_driver);
1782         tty_unregister_driver(acm_tty_driver);
1783         put_tty_driver(acm_tty_driver);
1784 }
1785
1786 module_init(acm_init);
1787 module_exit(acm_exit);
1788
1789 MODULE_AUTHOR(DRIVER_AUTHOR);
1790 MODULE_DESCRIPTION(DRIVER_DESC);
1791 MODULE_LICENSE("GPL");
1792 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);