git.oblomov.eu Git - linux-2.6/blob - 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@suse.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  *
  11  * USB Abstract Control Model driver for USB modems and ISDN adapters
  12  *
  13  * Sponsored by SuSE
  14  *
  15  * ChangeLog:
  16  *      v0.9  - thorough cleaning, URBification, almost a rewrite
  17  *      v0.10 - some more cleanups
  18  *      v0.11 - fixed flow control, read error doesn't stop reads
  19  *      v0.12 - added TIOCM ioctls, added break handling, made struct acm kmalloced
  20  *      v0.13 - added termios, added hangup
  21  *      v0.14 - sized down struct acm
  22  *      v0.15 - fixed flow control again - characters could be lost
  23  *      v0.16 - added code for modems with swapped data and control interfaces
  24  *      v0.17 - added new style probing
  25  *      v0.18 - fixed new style probing for devices with more configurations
  26  *      v0.19 - fixed CLOCAL handling (thanks to Richard Shih-Ping Chan)
  27  *      v0.20 - switched to probing on interface (rather than device) class
  28  *      v0.21 - revert to probing on device for devices with multiple configs
  29  *      v0.22 - probe only the control interface. if usbcore doesn't choose the
  30  *              config we want, sysadmin changes bConfigurationValue in sysfs.
  31  *      v0.23 - use softirq for rx processing, as needed by tty layer
  32  *      v0.24 - change probe method to evaluate CDC union descriptor
  33  *      v0.25 - downstream tasks paralelized to maximize throughput
  34  */
  35
  36 /*
  37  * This program is free software; you can redistribute it and/or modify
  38  * it under the terms of the GNU General Public License as published by
  39  * the Free Software Foundation; either version 2 of the License, or
  40  * (at your option) any later version.
  41  *
  42  * This program is distributed in the hope that it will be useful,
  43  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  44  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  45  * GNU General Public License for more details.
  46  *
  47  * You should have received a copy of the GNU General Public License
  48  * along with this program; if not, write to the Free Software
  49  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  50  */
  51
  52 #undef DEBUG
  53
  54 #include <linux/kernel.h>
  55 #include <linux/errno.h>
  56 #include <linux/init.h>
  57 #include <linux/slab.h>
  58 #include <linux/tty.h>
  59 #include <linux/tty_driver.h>
  60 #include <linux/tty_flip.h>
  61 #include <linux/module.h>
  62 #include <linux/mutex.h>
  63 #include <asm/uaccess.h>
  64 #include <linux/usb.h>
  65 #include <linux/usb/cdc.h>
  66 #include <asm/byteorder.h>
  67 #include <asm/unaligned.h>
  68 #include <linux/list.h>
  69
  70 #include "cdc-acm.h"
  71
  72 /*
  73  * Version Information
  74  */
  75 #define DRIVER_VERSION "v0.25"
  76 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek"
  77 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  78
  79 static struct usb_driver acm_driver;
  80 static struct tty_driver *acm_tty_driver;
  81 static struct acm *acm_table[ACM_TTY_MINORS];
  82
  83 static DEFINE_MUTEX(open_mutex);
  84
  85 #define ACM_READY(acm)  (acm && acm->dev && acm->used)
  86
  87 /*
  88  * Functions for ACM control messages.
  89  */
  90
  91 static int acm_ctrl_msg(struct acm *acm, int request, int value, void *buf, int len)
  92 {
  93         int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
  94                 request, USB_RT_ACM, value,
  95                 acm->control->altsetting[0].desc.bInterfaceNumber,
  96                 buf, len, 5000);
  97         dbg("acm_control_msg: rq: 0x%02x val: %#x len: %#x result: %d", request, value, len, retval);
  98         return retval < 0 ? retval : 0;
  99 }
 100
 101 /* devices aren't required to support these requests.
 102  * the cdc acm descriptor tells whether they do...
 103  */
 104 #define acm_set_control(acm, control) \
 105         acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
 106 #define acm_set_line(acm, line) \
 107         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 108 #define acm_send_break(acm, ms) \
 109         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 110
 111 /*
 112  * Write buffer management.
 113  * All of these assume proper locks taken by the caller.
 114  */
 115
 116 static int acm_wb_alloc(struct acm *acm)
 117 {
 118         int i, wbn;
 119         struct acm_wb *wb;
 120
 121         wbn = acm->write_current;
 122         i = 0;
 123         for (;;) {
 124                 wb = &acm->wb[wbn];
 125                 if (!wb->use) {
 126                         wb->use = 1;
 127                         return wbn;
 128                 }
 129                 wbn = (wbn + 1) % ACM_NW;
 130                 if (++i >= ACM_NW)
 131                         return -1;
 132         }
 133 }
 134
 135 static void acm_wb_free(struct acm *acm, int wbn)
 136 {
 137         acm->wb[wbn].use = 0;
 138 }
 139
 140 static int acm_wb_is_avail(struct acm *acm)
 141 {
 142         int i, n;
 143
 144         n = ACM_NW;
 145         for (i = 0; i < ACM_NW; i++) {
 146                 n -= acm->wb[i].use;
 147         }
 148         return n;
 149 }
 150
 151 static inline int acm_wb_is_used(struct acm *acm, int wbn)
 152 {
 153         return acm->wb[wbn].use;
 154 }
 155
 156 /*
 157  * Finish write.
 158  */
 159 static void acm_write_done(struct acm *acm)
 160 {
 161         unsigned long flags;
 162         int wbn;
 163
 164         spin_lock_irqsave(&acm->write_lock, flags);
 165         acm->write_ready = 1;
 166         wbn = acm->write_current;
 167         acm_wb_free(acm, wbn);
 168         acm->write_current = (wbn + 1) % ACM_NW;
 169         spin_unlock_irqrestore(&acm->write_lock, flags);
 170 }
 171
 172 /*
 173  * Poke write.
 174  */
 175 static int acm_write_start(struct acm *acm)
 176 {
 177         unsigned long flags;
 178         int wbn;
 179         struct acm_wb *wb;
 180         int rc;
 181
 182         spin_lock_irqsave(&acm->write_lock, flags);
 183         if (!acm->dev) {
 184                 spin_unlock_irqrestore(&acm->write_lock, flags);
 185                 return -ENODEV;
 186         }
 187
 188         if (!acm->write_ready) {
 189                 spin_unlock_irqrestore(&acm->write_lock, flags);
 190                 return 0;       /* A white lie */
 191         }
 192
 193         wbn = acm->write_current;
 194         if (!acm_wb_is_used(acm, wbn)) {
 195                 spin_unlock_irqrestore(&acm->write_lock, flags);
 196                 return 0;
 197         }
 198         wb = &acm->wb[wbn];
 199
 200         acm->write_ready = 0;
 201         spin_unlock_irqrestore(&acm->write_lock, flags);
 202
 203         acm->writeurb->transfer_buffer = wb->buf;
 204         acm->writeurb->transfer_dma = wb->dmah;
 205         acm->writeurb->transfer_buffer_length = wb->len;
 206         acm->writeurb->dev = acm->dev;
 207
 208         if ((rc = usb_submit_urb(acm->writeurb, GFP_ATOMIC)) < 0) {
 209                 dbg("usb_submit_urb(write bulk) failed: %d", rc);
 210                 acm_write_done(acm);
 211         }
 212         return rc;
 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         unsigned char *data;
 259         int newctrl;
 260         int status;
 261
 262         switch (urb->status) {
 263         case 0:
 264                 /* success */
 265                 break;
 266         case -ECONNRESET:
 267         case -ENOENT:
 268         case -ESHUTDOWN:
 269                 /* this urb is terminated, clean up */
 270                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 271                 return;
 272         default:
 273                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 274                 goto exit;
 275         }
 276
 277         if (!ACM_READY(acm))
 278                 goto exit;
 279
 280         data = (unsigned char *)(dr + 1);
 281         switch (dr->bNotificationType) {
 282
 283                 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 284
 285                         dbg("%s network", dr->wValue ? "connected to" : "disconnected from");
 286                         break;
 287
 288                 case USB_CDC_NOTIFY_SERIAL_STATE:
 289
 290                         newctrl = le16_to_cpu(get_unaligned((__le16 *) data));
 291
 292                         if (acm->tty && !acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 293                                 dbg("calling hangup");
 294                                 tty_hangup(acm->tty);
 295                         }
 296
 297                         acm->ctrlin = newctrl;
 298
 299                         dbg("input control lines: dcd%c dsr%c break%c ring%c framing%c parity%c overrun%c",
 300                                 acm->ctrlin & ACM_CTRL_DCD ? '+' : '-', acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
 301                                 acm->ctrlin & ACM_CTRL_BRK ? '+' : '-', acm->ctrlin & ACM_CTRL_RI  ? '+' : '-',
 302                                 acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',     acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
 303                                 acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
 304
 305                         break;
 306
 307                 default:
 308                         dbg("unknown notification %d received: index %d len %d data0 %d data1 %d",
 309                                 dr->bNotificationType, dr->wIndex,
 310                                 dr->wLength, data[0], data[1]);
 311                         break;
 312         }
 313 exit:
 314         status = usb_submit_urb (urb, GFP_ATOMIC);
 315         if (status)
 316                 err ("%s - usb_submit_urb failed with result %d",
 317                      __FUNCTION__, status);
 318 }
 319
 320 /* data interface returns incoming bytes, or we got unthrottled */
 321 static void acm_read_bulk(struct urb *urb)
 322 {
 323         struct acm_rb *buf;
 324         struct acm_ru *rcv = urb->context;
 325         struct acm *acm = rcv->instance;
 326         int status = urb->status;
 327         dbg("Entering acm_read_bulk with status %d", urb->status);
 328
 329         if (!ACM_READY(acm))
 330                 return;
 331
 332         if (status)
 333                 dev_dbg(&acm->data->dev, "bulk rx status %d", status);
 334
 335         buf = rcv->buffer;
 336         buf->size = urb->actual_length;
 337
 338         if (likely(status == 0)) {
 339                 spin_lock(&acm->read_lock);
 340                 list_add_tail(&rcv->list, &acm->spare_read_urbs);
 341                 list_add_tail(&buf->list, &acm->filled_read_bufs);
 342                 spin_unlock(&acm->read_lock);
 343         } else {
 344                 /* we drop the buffer due to an error */
 345                 spin_lock(&acm->read_lock);
 346                 list_add_tail(&rcv->list, &acm->spare_read_urbs);
 347                 list_add(&buf->list, &acm->spare_read_bufs);
 348                 spin_unlock(&acm->read_lock);
 349                 /* nevertheless the tasklet must be kicked unconditionally
 350                 so the queue cannot dry up */
 351         }
 352         tasklet_schedule(&acm->urb_task);
 353 }
 354
 355 static void acm_rx_tasklet(unsigned long _acm)
 356 {
 357         struct acm *acm = (void *)_acm;
 358         struct acm_rb *buf;
 359         struct tty_struct *tty = acm->tty;
 360         struct acm_ru *rcv;
 361         unsigned long flags;
 362         unsigned char throttled;
 363         dbg("Entering acm_rx_tasklet");
 364
 365         if (!ACM_READY(acm))
 366                 return;
 367
 368         spin_lock_irqsave(&acm->throttle_lock, flags);
 369         throttled = acm->throttle;
 370         spin_unlock_irqrestore(&acm->throttle_lock, flags);
 371         if (throttled)
 372                 return;
 373
 374 next_buffer:
 375         spin_lock_irqsave(&acm->read_lock, flags);
 376         if (list_empty(&acm->filled_read_bufs)) {
 377                 spin_unlock_irqrestore(&acm->read_lock, flags);
 378                 goto urbs;
 379         }
 380         buf = list_entry(acm->filled_read_bufs.next,
 381                          struct acm_rb, list);
 382         list_del(&buf->list);
 383         spin_unlock_irqrestore(&acm->read_lock, flags);
 384
 385         dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d", buf, buf->size);
 386
 387         tty_buffer_request_room(tty, buf->size);
 388         spin_lock_irqsave(&acm->throttle_lock, flags);
 389         throttled = acm->throttle;
 390         spin_unlock_irqrestore(&acm->throttle_lock, flags);
 391         if (!throttled)
 392                 tty_insert_flip_string(tty, buf->base, buf->size);
 393         tty_flip_buffer_push(tty);
 394
 395         if (throttled) {
 396                 dbg("Throttling noticed");
 397                 spin_lock_irqsave(&acm->read_lock, flags);
 398                 list_add(&buf->list, &acm->filled_read_bufs);
 399                 spin_unlock_irqrestore(&acm->read_lock, flags);
 400                 return;
 401         }
 402
 403         spin_lock_irqsave(&acm->read_lock, flags);
 404         list_add(&buf->list, &acm->spare_read_bufs);
 405         spin_unlock_irqrestore(&acm->read_lock, flags);
 406         goto next_buffer;
 407
 408 urbs:
 409         while (!list_empty(&acm->spare_read_bufs)) {
 410                 spin_lock_irqsave(&acm->read_lock, flags);
 411                 if (list_empty(&acm->spare_read_urbs)) {
 412                         spin_unlock_irqrestore(&acm->read_lock, flags);
 413                         return;
 414                 }
 415                 rcv = list_entry(acm->spare_read_urbs.next,
 416                                  struct acm_ru, list);
 417                 list_del(&rcv->list);
 418                 spin_unlock_irqrestore(&acm->read_lock, flags);
 419
 420                 buf = list_entry(acm->spare_read_bufs.next,
 421                                  struct acm_rb, list);
 422                 list_del(&buf->list);
 423
 424                 rcv->buffer = buf;
 425
 426                 usb_fill_bulk_urb(rcv->urb, acm->dev,
 427                                   acm->rx_endpoint,
 428                                   buf->base,
 429                                   acm->readsize,
 430                                   acm_read_bulk, rcv);
 431                 rcv->urb->transfer_dma = buf->dma;
 432                 rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 433
 434                 dbg("acm_rx_tasklet: sending urb 0x%p, rcv 0x%p, buf 0x%p", rcv->urb, rcv, buf);
 435
 436                 /* This shouldn't kill the driver as unsuccessful URBs are returned to the
 437                    free-urbs-pool and resubmited ASAP */
 438                 if (usb_submit_urb(rcv->urb, GFP_ATOMIC) < 0) {
 439                         list_add(&buf->list, &acm->spare_read_bufs);
 440                         spin_lock_irqsave(&acm->read_lock, flags);
 441                         list_add(&rcv->list, &acm->spare_read_urbs);
 442                         spin_unlock_irqrestore(&acm->read_lock, flags);
 443                         return;
 444                 }
 445         }
 446 }
 447
 448 /* data interface wrote those outgoing bytes */
 449 static void acm_write_bulk(struct urb *urb)
 450 {
 451         struct acm *acm = (struct acm *)urb->context;
 452
 453         dbg("Entering acm_write_bulk with status %d", urb->status);
 454
 455         acm_write_done(acm);
 456         acm_write_start(acm);
 457         if (ACM_READY(acm))
 458                 schedule_work(&acm->work);
 459 }
 460
 461 static void acm_softint(struct work_struct *work)
 462 {
 463         struct acm *acm = container_of(work, struct acm, work);
 464         dbg("Entering acm_softint.");
 465
 466         if (!ACM_READY(acm))
 467                 return;
 468         tty_wakeup(acm->tty);
 469 }
 470
 471 /*
 472  * TTY handlers
 473  */
 474
 475 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 476 {
 477         struct acm *acm;
 478         int rv = -EINVAL;
 479         int i;
 480         dbg("Entering acm_tty_open.");
 481
 482         mutex_lock(&open_mutex);
 483
 484         acm = acm_table[tty->index];
 485         if (!acm || !acm->dev)
 486                 goto err_out;
 487         else
 488                 rv = 0;
 489
 490         tty->driver_data = acm;
 491         acm->tty = tty;
 492
 493         /* force low_latency on so that our tty_push actually forces the data through,
 494            otherwise it is scheduled, and with high data rates data can get lost. */
 495         tty->low_latency = 1;
 496
 497         if (acm->used++) {
 498                 goto done;
 499         }
 500
 501         acm->ctrlurb->dev = acm->dev;
 502         if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
 503                 dbg("usb_submit_urb(ctrl irq) failed");
 504                 goto bail_out;
 505         }
 506
 507         if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS) &&
 508             (acm->ctrl_caps & USB_CDC_CAP_LINE))
 509                 goto full_bailout;
 510
 511         INIT_LIST_HEAD(&acm->spare_read_urbs);
 512         INIT_LIST_HEAD(&acm->spare_read_bufs);
 513         INIT_LIST_HEAD(&acm->filled_read_bufs);
 514         for (i = 0; i < acm->rx_buflimit; i++) {
 515                 list_add(&(acm->ru[i].list), &acm->spare_read_urbs);
 516         }
 517         for (i = 0; i < acm->rx_buflimit; i++) {
 518                 list_add(&(acm->rb[i].list), &acm->spare_read_bufs);
 519         }
 520
 521         acm->throttle = 0;
 522
 523         tasklet_schedule(&acm->urb_task);
 524
 525 done:
 526 err_out:
 527         mutex_unlock(&open_mutex);
 528         return rv;
 529
 530 full_bailout:
 531         usb_kill_urb(acm->ctrlurb);
 532 bail_out:
 533         acm->used--;
 534         mutex_unlock(&open_mutex);
 535         return -EIO;
 536 }
 537
 538 static void acm_tty_unregister(struct acm *acm)
 539 {
 540         int i,nr;
 541
 542         nr = acm->rx_buflimit;
 543         tty_unregister_device(acm_tty_driver, acm->minor);
 544         usb_put_intf(acm->control);
 545         acm_table[acm->minor] = NULL;
 546         usb_free_urb(acm->ctrlurb);
 547         usb_free_urb(acm->writeurb);
 548         for (i = 0; i < nr; i++)
 549                 usb_free_urb(acm->ru[i].urb);
 550         kfree(acm->country_codes);
 551         kfree(acm);
 552 }
 553
 554 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 555 {
 556         struct acm *acm = tty->driver_data;
 557         int i,nr;
 558
 559         if (!acm || !acm->used)
 560                 return;
 561
 562         nr = acm->rx_buflimit;
 563         mutex_lock(&open_mutex);
 564         if (!--acm->used) {
 565                 if (acm->dev) {
 566                         acm_set_control(acm, acm->ctrlout = 0);
 567                         usb_kill_urb(acm->ctrlurb);
 568                         usb_kill_urb(acm->writeurb);
 569                         for (i = 0; i < nr; i++)
 570                                 usb_kill_urb(acm->ru[i].urb);
 571                 } else
 572                         acm_tty_unregister(acm);
 573         }
 574         mutex_unlock(&open_mutex);
 575 }
 576
 577 static int acm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
 578 {
 579         struct acm *acm = tty->driver_data;
 580         int stat;
 581         unsigned long flags;
 582         int wbn;
 583         struct acm_wb *wb;
 584
 585         dbg("Entering acm_tty_write to write %d bytes,", count);
 586
 587         if (!ACM_READY(acm))
 588                 return -EINVAL;
 589         if (!count)
 590                 return 0;
 591
 592         spin_lock_irqsave(&acm->write_lock, flags);
 593         if ((wbn = acm_wb_alloc(acm)) < 0) {
 594                 spin_unlock_irqrestore(&acm->write_lock, flags);
 595                 acm_write_start(acm);
 596                 return 0;
 597         }
 598         wb = &acm->wb[wbn];
 599
 600         count = (count > acm->writesize) ? acm->writesize : count;
 601         dbg("Get %d bytes...", count);
 602         memcpy(wb->buf, buf, count);
 603         wb->len = count;
 604         spin_unlock_irqrestore(&acm->write_lock, flags);
 605
 606         if ((stat = acm_write_start(acm)) < 0)
 607                 return stat;
 608         return count;
 609 }
 610
 611 static int acm_tty_write_room(struct tty_struct *tty)
 612 {
 613         struct acm *acm = tty->driver_data;
 614         if (!ACM_READY(acm))
 615                 return -EINVAL;
 616         /*
 617          * Do not let the line discipline to know that we have a reserve,
 618          * or it might get too enthusiastic.
 619          */
 620         return (acm->write_ready && acm_wb_is_avail(acm)) ? acm->writesize : 0;
 621 }
 622
 623 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 624 {
 625         struct acm *acm = tty->driver_data;
 626         if (!ACM_READY(acm))
 627                 return -EINVAL;
 628         /*
 629          * This is inaccurate (overcounts), but it works.
 630          */
 631         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 632 }
 633
 634 static void acm_tty_throttle(struct tty_struct *tty)
 635 {
 636         struct acm *acm = tty->driver_data;
 637         if (!ACM_READY(acm))
 638                 return;
 639         spin_lock_bh(&acm->throttle_lock);
 640         acm->throttle = 1;
 641         spin_unlock_bh(&acm->throttle_lock);
 642 }
 643
 644 static void acm_tty_unthrottle(struct tty_struct *tty)
 645 {
 646         struct acm *acm = tty->driver_data;
 647         if (!ACM_READY(acm))
 648                 return;
 649         spin_lock_bh(&acm->throttle_lock);
 650         acm->throttle = 0;
 651         spin_unlock_bh(&acm->throttle_lock);
 652         tasklet_schedule(&acm->urb_task);
 653 }
 654
 655 static void acm_tty_break_ctl(struct tty_struct *tty, int state)
 656 {
 657         struct acm *acm = tty->driver_data;
 658         if (!ACM_READY(acm))
 659                 return;
 660         if (acm_send_break(acm, state ? 0xffff : 0))
 661                 dbg("send break failed");
 662 }
 663
 664 static int acm_tty_tiocmget(struct tty_struct *tty, struct file *file)
 665 {
 666         struct acm *acm = tty->driver_data;
 667
 668         if (!ACM_READY(acm))
 669                 return -EINVAL;
 670
 671         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 672                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 673                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 674                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 675                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 676                TIOCM_CTS;
 677 }
 678
 679 static int acm_tty_tiocmset(struct tty_struct *tty, struct file *file,
 680                             unsigned int set, unsigned int clear)
 681 {
 682         struct acm *acm = tty->driver_data;
 683         unsigned int newctrl;
 684
 685         if (!ACM_READY(acm))
 686                 return -EINVAL;
 687
 688         newctrl = acm->ctrlout;
 689         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 690         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 691
 692         newctrl = (newctrl & ~clear) | set;
 693
 694         if (acm->ctrlout == newctrl)
 695                 return 0;
 696         return acm_set_control(acm, acm->ctrlout = newctrl);
 697 }
 698
 699 static int acm_tty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
 700 {
 701         struct acm *acm = tty->driver_data;
 702
 703         if (!ACM_READY(acm))
 704                 return -EINVAL;
 705
 706         return -ENOIOCTLCMD;
 707 }
 708
 709 static const __u32 acm_tty_speed[] = {
 710         0, 50, 75, 110, 134, 150, 200, 300, 600,
 711         1200, 1800, 2400, 4800, 9600, 19200, 38400,
 712         57600, 115200, 230400, 460800, 500000, 576000,
 713         921600, 1000000, 1152000, 1500000, 2000000,
 714         2500000, 3000000, 3500000, 4000000
 715 };
 716
 717 static const __u8 acm_tty_size[] = {
 718         5, 6, 7, 8
 719 };
 720
 721 static void acm_tty_set_termios(struct tty_struct *tty, struct ktermios *termios_old)
 722 {
 723         struct acm *acm = tty->driver_data;
 724         struct ktermios *termios = tty->termios;
 725         struct usb_cdc_line_coding newline;
 726         int newctrl = acm->ctrlout;
 727
 728         if (!ACM_READY(acm))
 729                 return;
 730
 731         newline.dwDTERate = cpu_to_le32p(acm_tty_speed +
 732                 (termios->c_cflag & CBAUD & ~CBAUDEX) + (termios->c_cflag & CBAUDEX ? 15 : 0));
 733         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 734         newline.bParityType = termios->c_cflag & PARENB ?
 735                 (termios->c_cflag & PARODD ? 1 : 2) + (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 736         newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4];
 737
 738         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 739
 740         if (!newline.dwDTERate) {
 741                 newline.dwDTERate = acm->line.dwDTERate;
 742                 newctrl &= ~ACM_CTRL_DTR;
 743         } else  newctrl |=  ACM_CTRL_DTR;
 744
 745         if (newctrl != acm->ctrlout)
 746                 acm_set_control(acm, acm->ctrlout = newctrl);
 747
 748         if (memcmp(&acm->line, &newline, sizeof newline)) {
 749                 memcpy(&acm->line, &newline, sizeof newline);
 750                 dbg("set line: %d %d %d %d", le32_to_cpu(newline.dwDTERate),
 751                         newline.bCharFormat, newline.bParityType,
 752                         newline.bDataBits);
 753                 acm_set_line(acm, &acm->line);
 754         }
 755 }
 756
 757 /*
 758  * USB probe and disconnect routines.
 759  */
 760
 761 /* Little helper: write buffers free */
 762 static void acm_write_buffers_free(struct acm *acm)
 763 {
 764         int i;
 765         struct acm_wb *wb;
 766
 767         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
 768                 usb_buffer_free(acm->dev, acm->writesize, wb->buf, wb->dmah);
 769         }
 770 }
 771
 772 /* Little helper: write buffers allocate */
 773 static int acm_write_buffers_alloc(struct acm *acm)
 774 {
 775         int i;
 776         struct acm_wb *wb;
 777
 778         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
 779                 wb->buf = usb_buffer_alloc(acm->dev, acm->writesize, GFP_KERNEL,
 780                     &wb->dmah);
 781                 if (!wb->buf) {
 782                         while (i != 0) {
 783                                 --i;
 784                                 --wb;
 785                                 usb_buffer_free(acm->dev, acm->writesize,
 786                                     wb->buf, wb->dmah);
 787                         }
 788                         return -ENOMEM;
 789                 }
 790         }
 791         return 0;
 792 }
 793
 794 static int acm_probe (struct usb_interface *intf,
 795                       const struct usb_device_id *id)
 796 {
 797         struct usb_cdc_union_desc *union_header = NULL;
 798         struct usb_cdc_country_functional_desc *cfd = NULL;
 799         char *buffer = intf->altsetting->extra;
 800         int buflen = intf->altsetting->extralen;
 801         struct usb_interface *control_interface;
 802         struct usb_interface *data_interface;
 803         struct usb_endpoint_descriptor *epctrl;
 804         struct usb_endpoint_descriptor *epread;
 805         struct usb_endpoint_descriptor *epwrite;
 806         struct usb_device *usb_dev = interface_to_usbdev(intf);
 807         struct acm *acm;
 808         int minor;
 809         int ctrlsize,readsize;
 810         u8 *buf;
 811         u8 ac_management_function = 0;
 812         u8 call_management_function = 0;
 813         int call_interface_num = -1;
 814         int data_interface_num;
 815         unsigned long quirks;
 816         int num_rx_buf;
 817         int i;
 818
 819         /* normal quirks */
 820         quirks = (unsigned long)id->driver_info;
 821         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
 822
 823         /* handle quirks deadly to normal probing*/
 824         if (quirks == NO_UNION_NORMAL) {
 825                 data_interface = usb_ifnum_to_if(usb_dev, 1);
 826                 control_interface = usb_ifnum_to_if(usb_dev, 0);
 827                 goto skip_normal_probe;
 828         }
 829
 830         /* normal probing*/
 831         if (!buffer) {
 832                 err("Wierd descriptor references\n");
 833                 return -EINVAL;
 834         }
 835
 836         if (!buflen) {
 837                 if (intf->cur_altsetting->endpoint->extralen && intf->cur_altsetting->endpoint->extra) {
 838                         dev_dbg(&intf->dev,"Seeking extra descriptors on endpoint");
 839                         buflen = intf->cur_altsetting->endpoint->extralen;
 840                         buffer = intf->cur_altsetting->endpoint->extra;
 841                 } else {
 842                         err("Zero length descriptor references\n");
 843                         return -EINVAL;
 844                 }
 845         }
 846
 847         while (buflen > 0) {
 848                 if (buffer [1] != USB_DT_CS_INTERFACE) {
 849                         err("skipping garbage\n");
 850                         goto next_desc;
 851                 }
 852
 853                 switch (buffer [2]) {
 854                         case USB_CDC_UNION_TYPE: /* we've found it */
 855                                 if (union_header) {
 856                                         err("More than one union descriptor, skipping ...");
 857                                         goto next_desc;
 858                                 }
 859                                 union_header = (struct usb_cdc_union_desc *)
 860                                                         buffer;
 861                                 break;
 862                         case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
 863                                 cfd = (struct usb_cdc_country_functional_desc *)buffer;
 864                                 break;
 865                         case USB_CDC_HEADER_TYPE: /* maybe check version */
 866                                 break; /* for now we ignore it */
 867                         case USB_CDC_ACM_TYPE:
 868                                 ac_management_function = buffer[3];
 869                                 break;
 870                         case USB_CDC_CALL_MANAGEMENT_TYPE:
 871                                 call_management_function = buffer[3];
 872                                 call_interface_num = buffer[4];
 873                                 if ((call_management_function & 3) != 3)
 874                                         err("This device cannot do calls on its own. It is no modem.");
 875                                 break;
 876
 877                         default:
 878                                 err("Ignoring extra header, type %d, length %d", buffer[2], buffer[0]);
 879                                 break;
 880                         }
 881 next_desc:
 882                 buflen -= buffer[0];
 883                 buffer += buffer[0];
 884         }
 885
 886         if (!union_header) {
 887                 if (call_interface_num > 0) {
 888                         dev_dbg(&intf->dev,"No union descriptor, using call management descriptor");
 889                         data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
 890                         control_interface = intf;
 891                 } else {
 892                         dev_dbg(&intf->dev,"No union descriptor, giving up");
 893                         return -ENODEV;
 894                 }
 895         } else {
 896                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
 897                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
 898                 if (!control_interface || !data_interface) {
 899                         dev_dbg(&intf->dev,"no interfaces");
 900                         return -ENODEV;
 901                 }
 902         }
 903
 904         if (data_interface_num != call_interface_num)
 905                 dev_dbg(&intf->dev,"Seperate call control interface. That is not fully supported.");
 906
 907 skip_normal_probe:
 908
 909         /*workaround for switched interfaces */
 910         if (data_interface->cur_altsetting->desc.bInterfaceClass != CDC_DATA_INTERFACE_TYPE) {
 911                 if (control_interface->cur_altsetting->desc.bInterfaceClass == CDC_DATA_INTERFACE_TYPE) {
 912                         struct usb_interface *t;
 913                         dev_dbg(&intf->dev,"Your device has switched interfaces.");
 914
 915                         t = control_interface;
 916                         control_interface = data_interface;
 917                         data_interface = t;
 918                 } else {
 919                         return -EINVAL;
 920                 }
 921         }
 922
 923         if (usb_interface_claimed(data_interface)) { /* valid in this context */
 924                 dev_dbg(&intf->dev,"The data interface isn't available");
 925                 return -EBUSY;
 926         }
 927
 928
 929         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2)
 930                 return -EINVAL;
 931
 932         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
 933         epread = &data_interface->cur_altsetting->endpoint[0].desc;
 934         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
 935
 936
 937         /* workaround for switched endpoints */
 938         if (!usb_endpoint_dir_in(epread)) {
 939                 /* descriptors are swapped */
 940                 struct usb_endpoint_descriptor *t;
 941                 dev_dbg(&intf->dev,"The data interface has switched endpoints");
 942
 943                 t = epread;
 944                 epread = epwrite;
 945                 epwrite = t;
 946         }
 947         dbg("interfaces are valid");
 948         for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++);
 949
 950         if (minor == ACM_TTY_MINORS) {
 951                 err("no more free acm devices");
 952                 return -ENODEV;
 953         }
 954
 955         if (!(acm = kzalloc(sizeof(struct acm), GFP_KERNEL))) {
 956                 dev_dbg(&intf->dev, "out of memory (acm kzalloc)");
 957                 goto alloc_fail;
 958         }
 959
 960         ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize);
 961         readsize = le16_to_cpu(epread->wMaxPacketSize)* ( quirks == SINGLE_RX_URB ? 1 : 2);
 962         acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize);
 963         acm->control = control_interface;
 964         acm->data = data_interface;
 965         acm->minor = minor;
 966         acm->dev = usb_dev;
 967         acm->ctrl_caps = ac_management_function;
 968         acm->ctrlsize = ctrlsize;
 969         acm->readsize = readsize;
 970         acm->rx_buflimit = num_rx_buf;
 971         acm->urb_task.func = acm_rx_tasklet;
 972         acm->urb_task.data = (unsigned long) acm;
 973         INIT_WORK(&acm->work, acm_softint);
 974         spin_lock_init(&acm->throttle_lock);
 975         spin_lock_init(&acm->write_lock);
 976         spin_lock_init(&acm->read_lock);
 977         acm->write_ready = 1;
 978         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
 979
 980         buf = usb_buffer_alloc(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
 981         if (!buf) {
 982                 dev_dbg(&intf->dev, "out of memory (ctrl buffer alloc)");
 983                 goto alloc_fail2;
 984         }
 985         acm->ctrl_buffer = buf;
 986
 987         if (acm_write_buffers_alloc(acm) < 0) {
 988                 dev_dbg(&intf->dev, "out of memory (write buffer alloc)");
 989                 goto alloc_fail4;
 990         }
 991
 992         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
 993         if (!acm->ctrlurb) {
 994                 dev_dbg(&intf->dev, "out of memory (ctrlurb kmalloc)");
 995                 goto alloc_fail5;
 996         }
 997         for (i = 0; i < num_rx_buf; i++) {
 998                 struct acm_ru *rcv = &(acm->ru[i]);
 999
1000                 if (!(rcv->urb = usb_alloc_urb(0, GFP_KERNEL))) {
1001                         dev_dbg(&intf->dev, "out of memory (read urbs usb_alloc_urb)");
1002                         goto alloc_fail7;
1003                 }
1004
1005                 rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1006                 rcv->instance = acm;
1007         }
1008         for (i = 0; i < num_rx_buf; i++) {
1009                 struct acm_rb *buf = &(acm->rb[i]);
1010
1011                 if (!(buf->base = usb_buffer_alloc(acm->dev, readsize, GFP_KERNEL, &buf->dma))) {
1012                         dev_dbg(&intf->dev, "out of memory (read bufs usb_buffer_alloc)");
1013                         goto alloc_fail7;
1014                 }
1015         }
1016         acm->writeurb = usb_alloc_urb(0, GFP_KERNEL);
1017         if (!acm->writeurb) {
1018                 dev_dbg(&intf->dev, "out of memory (writeurb kmalloc)");
1019                 goto alloc_fail7;
1020         }
1021
1022         usb_set_intfdata (intf, acm);
1023
1024         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1025         if (i < 0)
1026                 goto alloc_fail8;
1027
1028         if (cfd) { /* export the country data */
1029                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1030                 if (!acm->country_codes)
1031                         goto skip_countries;
1032                 acm->country_code_size = cfd->bLength - 4;
1033                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0, cfd->bLength - 4);
1034                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1035
1036                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1037                 if (i < 0) {
1038                         kfree(acm->country_codes);
1039                         goto skip_countries;
1040                 }
1041
1042                 i = device_create_file(&intf->dev, &dev_attr_iCountryCodeRelDate);
1043                 if (i < 0) {
1044                         kfree(acm->country_codes);
1045                         goto skip_countries;
1046                 }
1047         }
1048
1049 skip_countries:
1050         usb_fill_int_urb(acm->ctrlurb, usb_dev, usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1051                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm, epctrl->bInterval);
1052         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1053         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1054
1055         usb_fill_bulk_urb(acm->writeurb, usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1056                           NULL, acm->writesize, acm_write_bulk, acm);
1057         acm->writeurb->transfer_flags |= URB_NO_FSBR | URB_NO_TRANSFER_DMA_MAP;
1058
1059         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1060
1061         acm_set_control(acm, acm->ctrlout);
1062
1063         acm->line.dwDTERate = cpu_to_le32(9600);
1064         acm->line.bDataBits = 8;
1065         acm_set_line(acm, &acm->line);
1066
1067         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1068
1069         usb_get_intf(control_interface);
1070         tty_register_device(acm_tty_driver, minor, &control_interface->dev);
1071
1072         acm_table[minor] = acm;
1073
1074         return 0;
1075 alloc_fail8:
1076         usb_free_urb(acm->writeurb);
1077 alloc_fail7:
1078         for (i = 0; i < num_rx_buf; i++)
1079                 usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma);
1080         for (i = 0; i < num_rx_buf; i++)
1081                 usb_free_urb(acm->ru[i].urb);
1082         usb_free_urb(acm->ctrlurb);
1083 alloc_fail5:
1084         acm_write_buffers_free(acm);
1085 alloc_fail4:
1086         usb_buffer_free(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1087 alloc_fail2:
1088         kfree(acm);
1089 alloc_fail:
1090         return -ENOMEM;
1091 }
1092
1093 static void acm_disconnect(struct usb_interface *intf)
1094 {
1095         struct acm *acm = usb_get_intfdata(intf);
1096         struct usb_device *usb_dev = interface_to_usbdev(intf);
1097         int i;
1098
1099         if (!acm || !acm->dev) {
1100                 dbg("disconnect on nonexisting interface");
1101                 return;
1102         }
1103
1104         mutex_lock(&open_mutex);
1105         if (!usb_get_intfdata(intf)) {
1106                 mutex_unlock(&open_mutex);
1107                 return;
1108         }
1109         if (acm->country_codes){
1110                 device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1111                 device_remove_file(&intf->dev, &dev_attr_iCountryCodeRelDate);
1112         }
1113         device_remove_file(&intf->dev, &dev_attr_bmCapabilities);
1114         acm->dev = NULL;
1115         usb_set_intfdata(acm->control, NULL);
1116         usb_set_intfdata(acm->data, NULL);
1117
1118         tasklet_disable(&acm->urb_task);
1119
1120         usb_kill_urb(acm->ctrlurb);
1121         usb_kill_urb(acm->writeurb);
1122         for (i = 0; i < acm->rx_buflimit; i++)
1123                 usb_kill_urb(acm->ru[i].urb);
1124
1125         INIT_LIST_HEAD(&acm->filled_read_bufs);
1126         INIT_LIST_HEAD(&acm->spare_read_bufs);
1127
1128         tasklet_enable(&acm->urb_task);
1129
1130         flush_scheduled_work(); /* wait for acm_softint */
1131
1132         acm_write_buffers_free(acm);
1133         usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1134         for (i = 0; i < acm->rx_buflimit; i++)
1135                 usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma);
1136
1137         usb_driver_release_interface(&acm_driver, intf == acm->control ? acm->data : intf);
1138
1139         if (!acm->used) {
1140                 acm_tty_unregister(acm);
1141                 mutex_unlock(&open_mutex);
1142                 return;
1143         }
1144
1145         mutex_unlock(&open_mutex);
1146
1147         if (acm->tty)
1148                 tty_hangup(acm->tty);
1149 }
1150
1151 /*
1152  * USB driver structure.
1153  */
1154
1155 static struct usb_device_id acm_ids[] = {
1156         /* quirky and broken devices */
1157         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1158         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1159         },
1160         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1161         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1162         },
1163         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1164         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1165         },
1166         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1167         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1168         },
1169         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1170         .driver_info = SINGLE_RX_URB, /* firmware bug */
1171         },
1172         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1173         .driver_info = SINGLE_RX_URB, /* firmware bug */
1174         },
1175         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1176         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1177         },
1178
1179         /* control interfaces with various AT-command sets */
1180         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1181                 USB_CDC_ACM_PROTO_AT_V25TER) },
1182         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1183                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1184         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1185                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1186         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1187                 USB_CDC_ACM_PROTO_AT_GSM) },
1188         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1189                 USB_CDC_ACM_PROTO_AT_3G ) },
1190         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1191                 USB_CDC_ACM_PROTO_AT_CDMA) },
1192
1193         /* NOTE:  COMM/ACM/0xff is likely MSFT RNDIS ... NOT a modem!! */
1194         { }
1195 };
1196
1197 MODULE_DEVICE_TABLE (usb, acm_ids);
1198
1199 static struct usb_driver acm_driver = {
1200         .name =         "cdc_acm",
1201         .probe =        acm_probe,
1202         .disconnect =   acm_disconnect,
1203         .id_table =     acm_ids,
1204 };
1205
1206 /*
1207  * TTY driver structures.
1208  */
1209
1210 static const struct tty_operations acm_ops = {
1211         .open =                 acm_tty_open,
1212         .close =                acm_tty_close,
1213         .write =                acm_tty_write,
1214         .write_room =           acm_tty_write_room,
1215         .ioctl =                acm_tty_ioctl,
1216         .throttle =             acm_tty_throttle,
1217         .unthrottle =           acm_tty_unthrottle,
1218         .chars_in_buffer =      acm_tty_chars_in_buffer,
1219         .break_ctl =            acm_tty_break_ctl,
1220         .set_termios =          acm_tty_set_termios,
1221         .tiocmget =             acm_tty_tiocmget,
1222         .tiocmset =             acm_tty_tiocmset,
1223 };
1224
1225 /*
1226  * Init / exit.
1227  */
1228
1229 static int __init acm_init(void)
1230 {
1231         int retval;
1232         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1233         if (!acm_tty_driver)
1234                 return -ENOMEM;
1235         acm_tty_driver->owner = THIS_MODULE,
1236         acm_tty_driver->driver_name = "acm",
1237         acm_tty_driver->name = "ttyACM",
1238         acm_tty_driver->major = ACM_TTY_MAJOR,
1239         acm_tty_driver->minor_start = 0,
1240         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1241         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1242         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1243         acm_tty_driver->init_termios = tty_std_termios;
1244         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1245         tty_set_operations(acm_tty_driver, &acm_ops);
1246
1247         retval = tty_register_driver(acm_tty_driver);
1248         if (retval) {
1249                 put_tty_driver(acm_tty_driver);
1250                 return retval;
1251         }
1252
1253         retval = usb_register(&acm_driver);
1254         if (retval) {
1255                 tty_unregister_driver(acm_tty_driver);
1256                 put_tty_driver(acm_tty_driver);
1257                 return retval;
1258         }
1259
1260         info(DRIVER_VERSION ":" DRIVER_DESC);
1261
1262         return 0;
1263 }
1264
1265 static void __exit acm_exit(void)
1266 {
1267         usb_deregister(&acm_driver);
1268         tty_unregister_driver(acm_tty_driver);
1269         put_tty_driver(acm_tty_driver);
1270 }
1271
1272 module_init(acm_init);
1273 module_exit(acm_exit);
1274
1275 MODULE_AUTHOR( DRIVER_AUTHOR );
1276 MODULE_DESCRIPTION( DRIVER_DESC );
1277 MODULE_LICENSE("GPL");
1278