drivers/usb/serial/usb_wwan.c

   1 /*
   2   USB Driver layer for GSM modems
   3
   4   Copyright (C) 2005  Matthias Urlichs <smurf@smurf.noris.de>
   5
   6   This driver is free software; you can redistribute it and/or modify
   7   it under the terms of Version 2 of the GNU General Public License as
   8   published by the Free Software Foundation.
   9
  10   Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
  11
  12   History: see the git log.
  13
  14   Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
  15
  16   This driver exists because the "normal" serial driver doesn't work too well
  17   with GSM modems. Issues:
  18   - data loss -- one single Receive URB is not nearly enough
  19   - controlling the baud rate doesn't make sense
  20 */
  21
  22 #define DRIVER_VERSION "v0.7.2"
  23 #define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
  24 #define DRIVER_DESC "USB Driver for GSM modems"
  25
  26 #include <linux/kernel.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/errno.h>
  29 #include <linux/slab.h>
  30 #include <linux/tty.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/bitops.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include "usb-wwan.h"
  37
  38 static int debug;
  39
  40 void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
  41 {
  42         struct usb_serial *serial = port->serial;
  43         struct usb_wwan_port_private *portdata;
  44
  45         struct usb_wwan_intf_private *intfdata;
  46
  47         dbg("%s", __func__);
  48
  49         intfdata = port->serial->private;
  50
  51         if (!intfdata->send_setup)
  52                 return;
  53
  54         portdata = usb_get_serial_port_data(port);
  55         mutex_lock(&serial->disc_mutex);
  56         portdata->rts_state = on;
  57         portdata->dtr_state = on;
  58         if (serial->dev)
  59                 intfdata->send_setup(port);
  60         mutex_unlock(&serial->disc_mutex);
  61 }
  62 EXPORT_SYMBOL(usb_wwan_dtr_rts);
  63
  64 void usb_wwan_set_termios(struct tty_struct *tty,
  65                           struct usb_serial_port *port,
  66                           struct ktermios *old_termios)
  67 {
  68         struct usb_wwan_intf_private *intfdata = port->serial->private;
  69
  70         dbg("%s", __func__);
  71
  72         /* Doesn't support option setting */
  73         tty_termios_copy_hw(tty->termios, old_termios);
  74
  75         if (intfdata->send_setup)
  76                 intfdata->send_setup(port);
  77 }
  78 EXPORT_SYMBOL(usb_wwan_set_termios);
  79
  80 int usb_wwan_tiocmget(struct tty_struct *tty, struct file *file)
  81 {
  82         struct usb_serial_port *port = tty->driver_data;
  83         unsigned int value;
  84         struct usb_wwan_port_private *portdata;
  85
  86         portdata = usb_get_serial_port_data(port);
  87
  88         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
  89             ((portdata->dtr_state) ? TIOCM_DTR : 0) |
  90             ((portdata->cts_state) ? TIOCM_CTS : 0) |
  91             ((portdata->dsr_state) ? TIOCM_DSR : 0) |
  92             ((portdata->dcd_state) ? TIOCM_CAR : 0) |
  93             ((portdata->ri_state) ? TIOCM_RNG : 0);
  94
  95         return value;
  96 }
  97 EXPORT_SYMBOL(usb_wwan_tiocmget);
  98
  99 int usb_wwan_tiocmset(struct tty_struct *tty, struct file *file,
 100                       unsigned int set, unsigned int clear)
 101 {
 102         struct usb_serial_port *port = tty->driver_data;
 103         struct usb_wwan_port_private *portdata;
 104         struct usb_wwan_intf_private *intfdata;
 105
 106         portdata = usb_get_serial_port_data(port);
 107         intfdata = port->serial->private;
 108
 109         if (!intfdata->send_setup)
 110                 return -EINVAL;
 111
 112         /* FIXME: what locks portdata fields ? */
 113         if (set & TIOCM_RTS)
 114                 portdata->rts_state = 1;
 115         if (set & TIOCM_DTR)
 116                 portdata->dtr_state = 1;
 117
 118         if (clear & TIOCM_RTS)
 119                 portdata->rts_state = 0;
 120         if (clear & TIOCM_DTR)
 121                 portdata->dtr_state = 0;
 122         return intfdata->send_setup(port);
 123 }
 124 EXPORT_SYMBOL(usb_wwan_tiocmset);
 125
 126 /* Write */
 127 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
 128                    const unsigned char *buf, int count)
 129 {
 130         struct usb_wwan_port_private *portdata;
 131         struct usb_wwan_intf_private *intfdata;
 132         int i;
 133         int left, todo;
 134         struct urb *this_urb = NULL;    /* spurious */
 135         int err;
 136         unsigned long flags;
 137
 138         portdata = usb_get_serial_port_data(port);
 139         intfdata = port->serial->private;
 140
 141         dbg("%s: write (%d chars)", __func__, count);
 142
 143         i = 0;
 144         left = count;
 145         for (i = 0; left > 0 && i < N_OUT_URB; i++) {
 146                 todo = left;
 147                 if (todo > OUT_BUFLEN)
 148                         todo = OUT_BUFLEN;
 149
 150                 this_urb = portdata->out_urbs[i];
 151                 if (test_and_set_bit(i, &portdata->out_busy)) {
 152                         if (time_before(jiffies,
 153                                         portdata->tx_start_time[i] + 10 * HZ))
 154                                 continue;
 155                         usb_unlink_urb(this_urb);
 156                         continue;
 157                 }
 158                 dbg("%s: endpoint %d buf %d", __func__,
 159                     usb_pipeendpoint(this_urb->pipe), i);
 160
 161                 err = usb_autopm_get_interface_async(port->serial->interface);
 162                 if (err < 0)
 163                         break;
 164
 165                 /* send the data */
 166                 memcpy(this_urb->transfer_buffer, buf, todo);
 167                 this_urb->transfer_buffer_length = todo;
 168
 169                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 170                 if (intfdata->suspended) {
 171                         usb_anchor_urb(this_urb, &portdata->delayed);
 172                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 173                 } else {
 174                         intfdata->in_flight++;
 175                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 176                         err = usb_submit_urb(this_urb, GFP_ATOMIC);
 177                         if (err) {
 178                                 dbg("usb_submit_urb %p (write bulk) failed "
 179                                     "(%d)", this_urb, err);
 180                                 clear_bit(i, &portdata->out_busy);
 181                                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 182                                 intfdata->in_flight--;
 183                                 spin_unlock_irqrestore(&intfdata->susp_lock,
 184                                                        flags);
 185                                 continue;
 186                         }
 187                 }
 188
 189                 portdata->tx_start_time[i] = jiffies;
 190                 buf += todo;
 191                 left -= todo;
 192         }
 193
 194         count -= left;
 195         dbg("%s: wrote (did %d)", __func__, count);
 196         return count;
 197 }
 198 EXPORT_SYMBOL(usb_wwan_write);
 199
 200 static void usb_wwan_indat_callback(struct urb *urb)
 201 {
 202         int err;
 203         int endpoint;
 204         struct usb_serial_port *port;
 205         struct tty_struct *tty;
 206         unsigned char *data = urb->transfer_buffer;
 207         int status = urb->status;
 208
 209         dbg("%s: %p", __func__, urb);
 210
 211         endpoint = usb_pipeendpoint(urb->pipe);
 212         port = urb->context;
 213
 214         if (status) {
 215                 dbg("%s: nonzero status: %d on endpoint %02x.",
 216                     __func__, status, endpoint);
 217         } else {
 218                 tty = tty_port_tty_get(&port->port);
 219                 if (urb->actual_length) {
 220                         tty_insert_flip_string(tty, data, urb->actual_length);
 221                         tty_flip_buffer_push(tty);
 222                 } else
 223                         dbg("%s: empty read urb received", __func__);
 224                 tty_kref_put(tty);
 225
 226                 /* Resubmit urb so we continue receiving */
 227                 if (status != -ESHUTDOWN) {
 228                         err = usb_submit_urb(urb, GFP_ATOMIC);
 229                         if (err && err != -EPERM)
 230                                 printk(KERN_ERR "%s: resubmit read urb failed. "
 231                                        "(%d)", __func__, err);
 232                         else
 233                                 usb_mark_last_busy(port->serial->dev);
 234                 }
 235
 236         }
 237 }
 238
 239 static void usb_wwan_outdat_callback(struct urb *urb)
 240 {
 241         struct usb_serial_port *port;
 242         struct usb_wwan_port_private *portdata;
 243         struct usb_wwan_intf_private *intfdata;
 244         int i;
 245
 246         dbg("%s", __func__);
 247
 248         port = urb->context;
 249         intfdata = port->serial->private;
 250
 251         usb_serial_port_softint(port);
 252         usb_autopm_put_interface_async(port->serial->interface);
 253         portdata = usb_get_serial_port_data(port);
 254         spin_lock(&intfdata->susp_lock);
 255         intfdata->in_flight--;
 256         spin_unlock(&intfdata->susp_lock);
 257
 258         for (i = 0; i < N_OUT_URB; ++i) {
 259                 if (portdata->out_urbs[i] == urb) {
 260                         smp_mb__before_clear_bit();
 261                         clear_bit(i, &portdata->out_busy);
 262                         break;
 263                 }
 264         }
 265 }
 266
 267 int usb_wwan_write_room(struct tty_struct *tty)
 268 {
 269         struct usb_serial_port *port = tty->driver_data;
 270         struct usb_wwan_port_private *portdata;
 271         int i;
 272         int data_len = 0;
 273         struct urb *this_urb;
 274
 275         portdata = usb_get_serial_port_data(port);
 276
 277         for (i = 0; i < N_OUT_URB; i++) {
 278                 this_urb = portdata->out_urbs[i];
 279                 if (this_urb && !test_bit(i, &portdata->out_busy))
 280                         data_len += OUT_BUFLEN;
 281         }
 282
 283         dbg("%s: %d", __func__, data_len);
 284         return data_len;
 285 }
 286 EXPORT_SYMBOL(usb_wwan_write_room);
 287
 288 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 289 {
 290         struct usb_serial_port *port = tty->driver_data;
 291         struct usb_wwan_port_private *portdata;
 292         int i;
 293         int data_len = 0;
 294         struct urb *this_urb;
 295
 296         portdata = usb_get_serial_port_data(port);
 297
 298         for (i = 0; i < N_OUT_URB; i++) {
 299                 this_urb = portdata->out_urbs[i];
 300                 /* FIXME: This locking is insufficient as this_urb may
 301                    go unused during the test */
 302                 if (this_urb && test_bit(i, &portdata->out_busy))
 303                         data_len += this_urb->transfer_buffer_length;
 304         }
 305         dbg("%s: %d", __func__, data_len);
 306         return data_len;
 307 }
 308 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 309
 310 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 311 {
 312         struct usb_wwan_port_private *portdata;
 313         struct usb_wwan_intf_private *intfdata;
 314         struct usb_serial *serial = port->serial;
 315         int i, err;
 316         struct urb *urb;
 317
 318         portdata = usb_get_serial_port_data(port);
 319         intfdata = serial->private;
 320
 321         dbg("%s", __func__);
 322
 323         /* Start reading from the IN endpoint */
 324         for (i = 0; i < N_IN_URB; i++) {
 325                 urb = portdata->in_urbs[i];
 326                 if (!urb)
 327                         continue;
 328                 err = usb_submit_urb(urb, GFP_KERNEL);
 329                 if (err) {
 330                         dbg("%s: submit urb %d failed (%d) %d",
 331                             __func__, i, err, urb->transfer_buffer_length);
 332                 }
 333         }
 334
 335         if (intfdata->send_setup)
 336                 intfdata->send_setup(port);
 337
 338         serial->interface->needs_remote_wakeup = 1;
 339         spin_lock_irq(&intfdata->susp_lock);
 340         portdata->opened = 1;
 341         spin_unlock_irq(&intfdata->susp_lock);
 342         usb_autopm_put_interface(serial->interface);
 343
 344         return 0;
 345 }
 346 EXPORT_SYMBOL(usb_wwan_open);
 347
 348 void usb_wwan_close(struct usb_serial_port *port)
 349 {
 350         int i;
 351         struct usb_serial *serial = port->serial;
 352         struct usb_wwan_port_private *portdata;
 353         struct usb_wwan_intf_private *intfdata = port->serial->private;
 354
 355         dbg("%s", __func__);
 356         portdata = usb_get_serial_port_data(port);
 357
 358         if (serial->dev) {
 359                 /* Stop reading/writing urbs */
 360                 spin_lock_irq(&intfdata->susp_lock);
 361                 portdata->opened = 0;
 362                 spin_unlock_irq(&intfdata->susp_lock);
 363
 364                 for (i = 0; i < N_IN_URB; i++)
 365                         usb_kill_urb(portdata->in_urbs[i]);
 366                 for (i = 0; i < N_OUT_URB; i++)
 367                         usb_kill_urb(portdata->out_urbs[i]);
 368                 usb_autopm_get_interface(serial->interface);
 369                 serial->interface->needs_remote_wakeup = 0;
 370         }
 371 }
 372 EXPORT_SYMBOL(usb_wwan_close);
 373
 374 /* Helper functions used by usb_wwan_setup_urbs */
 375 static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
 376                                       int dir, void *ctx, char *buf, int len,
 377                                       void (*callback) (struct urb *))
 378 {
 379         struct urb *urb;
 380
 381         if (endpoint == -1)
 382                 return NULL;    /* endpoint not needed */
 383
 384         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 385         if (urb == NULL) {
 386                 dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
 387                 return NULL;
 388         }
 389
 390         /* Fill URB using supplied data. */
 391         usb_fill_bulk_urb(urb, serial->dev,
 392                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 393                           buf, len, callback, ctx);
 394
 395         return urb;
 396 }
 397
 398 /* Setup urbs */
 399 static void usb_wwan_setup_urbs(struct usb_serial *serial)
 400 {
 401         int i, j;
 402         struct usb_serial_port *port;
 403         struct usb_wwan_port_private *portdata;
 404
 405         dbg("%s", __func__);
 406
 407         for (i = 0; i < serial->num_ports; i++) {
 408                 port = serial->port[i];
 409                 portdata = usb_get_serial_port_data(port);
 410
 411                 /* Do indat endpoints first */
 412                 for (j = 0; j < N_IN_URB; ++j) {
 413                         portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
 414                                                                   port->
 415                                                                   bulk_in_endpointAddress,
 416                                                                   USB_DIR_IN,
 417                                                                   port,
 418                                                                   portdata->
 419                                                                   in_buffer[j],
 420                                                                   IN_BUFLEN,
 421                                                                   usb_wwan_indat_callback);
 422                 }
 423
 424                 /* outdat endpoints */
 425                 for (j = 0; j < N_OUT_URB; ++j) {
 426                         portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
 427                                                                    port->
 428                                                                    bulk_out_endpointAddress,
 429                                                                    USB_DIR_OUT,
 430                                                                    port,
 431                                                                    portdata->
 432                                                                    out_buffer
 433                                                                    [j],
 434                                                                    OUT_BUFLEN,
 435                                                                    usb_wwan_outdat_callback);
 436                 }
 437         }
 438 }
 439
 440 int usb_wwan_startup(struct usb_serial *serial)
 441 {
 442         int i, j, err;
 443         struct usb_serial_port *port;
 444         struct usb_wwan_port_private *portdata;
 445         u8 *buffer;
 446
 447         dbg("%s", __func__);
 448
 449         /* Now setup per port private data */
 450         for (i = 0; i < serial->num_ports; i++) {
 451                 port = serial->port[i];
 452                 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 453                 if (!portdata) {
 454                         dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
 455                             __func__, i);
 456                         return 1;
 457                 }
 458                 init_usb_anchor(&portdata->delayed);
 459
 460                 for (j = 0; j < N_IN_URB; j++) {
 461                         buffer = (u8 *) __get_free_page(GFP_KERNEL);
 462                         if (!buffer)
 463                                 goto bail_out_error;
 464                         portdata->in_buffer[j] = buffer;
 465                 }
 466
 467                 for (j = 0; j < N_OUT_URB; j++) {
 468                         buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 469                         if (!buffer)
 470                                 goto bail_out_error2;
 471                         portdata->out_buffer[j] = buffer;
 472                 }
 473
 474                 usb_set_serial_port_data(port, portdata);
 475
 476                 if (!port->interrupt_in_urb)
 477                         continue;
 478                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 479                 if (err)
 480                         dbg("%s: submit irq_in urb failed %d", __func__, err);
 481         }
 482         usb_wwan_setup_urbs(serial);
 483         return 0;
 484
 485 bail_out_error2:
 486         for (j = 0; j < N_OUT_URB; j++)
 487                 kfree(portdata->out_buffer[j]);
 488 bail_out_error:
 489         for (j = 0; j < N_IN_URB; j++)
 490                 if (portdata->in_buffer[j])
 491                         free_page((unsigned long)portdata->in_buffer[j]);
 492         kfree(portdata);
 493         return 1;
 494 }
 495 EXPORT_SYMBOL(usb_wwan_startup);
 496
 497 static void stop_read_write_urbs(struct usb_serial *serial)
 498 {
 499         int i, j;
 500         struct usb_serial_port *port;
 501         struct usb_wwan_port_private *portdata;
 502
 503         /* Stop reading/writing urbs */
 504         for (i = 0; i < serial->num_ports; ++i) {
 505                 port = serial->port[i];
 506                 portdata = usb_get_serial_port_data(port);
 507                 for (j = 0; j < N_IN_URB; j++)
 508                         usb_kill_urb(portdata->in_urbs[j]);
 509                 for (j = 0; j < N_OUT_URB; j++)
 510                         usb_kill_urb(portdata->out_urbs[j]);
 511         }
 512 }
 513
 514 void usb_wwan_disconnect(struct usb_serial *serial)
 515 {
 516         dbg("%s", __func__);
 517
 518         stop_read_write_urbs(serial);
 519 }
 520 EXPORT_SYMBOL(usb_wwan_disconnect);
 521
 522 void usb_wwan_release(struct usb_serial *serial)
 523 {
 524         int i, j;
 525         struct usb_serial_port *port;
 526         struct usb_wwan_port_private *portdata;
 527
 528         dbg("%s", __func__);
 529
 530         /* Now free them */
 531         for (i = 0; i < serial->num_ports; ++i) {
 532                 port = serial->port[i];
 533                 portdata = usb_get_serial_port_data(port);
 534
 535                 for (j = 0; j < N_IN_URB; j++) {
 536                         usb_free_urb(portdata->in_urbs[j]);
 537                         free_page((unsigned long)
 538                                   portdata->in_buffer[j]);
 539                         portdata->in_urbs[j] = NULL;
 540                 }
 541                 for (j = 0; j < N_OUT_URB; j++) {
 542                         usb_free_urb(portdata->out_urbs[j]);
 543                         kfree(portdata->out_buffer[j]);
 544                         portdata->out_urbs[j] = NULL;
 545                 }
 546         }
 547
 548         /* Now free per port private data */
 549         for (i = 0; i < serial->num_ports; i++) {
 550                 port = serial->port[i];
 551                 kfree(usb_get_serial_port_data(port));
 552         }
 553 }
 554 EXPORT_SYMBOL(usb_wwan_release);
 555
 556 #ifdef CONFIG_PM
 557 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 558 {
 559         struct usb_wwan_intf_private *intfdata = serial->private;
 560         int b;
 561
 562         dbg("%s entered", __func__);
 563
 564         if (message.event & PM_EVENT_AUTO) {
 565                 spin_lock_irq(&intfdata->susp_lock);
 566                 b = intfdata->in_flight;
 567                 spin_unlock_irq(&intfdata->susp_lock);
 568
 569                 if (b)
 570                         return -EBUSY;
 571         }
 572
 573         spin_lock_irq(&intfdata->susp_lock);
 574         intfdata->suspended = 1;
 575         spin_unlock_irq(&intfdata->susp_lock);
 576         stop_read_write_urbs(serial);
 577
 578         return 0;
 579 }
 580 EXPORT_SYMBOL(usb_wwan_suspend);
 581
 582 static void play_delayed(struct usb_serial_port *port)
 583 {
 584         struct usb_wwan_intf_private *data;
 585         struct usb_wwan_port_private *portdata;
 586         struct urb *urb;
 587         int err;
 588
 589         portdata = usb_get_serial_port_data(port);
 590         data = port->serial->private;
 591         while ((urb = usb_get_from_anchor(&portdata->delayed))) {
 592                 err = usb_submit_urb(urb, GFP_ATOMIC);
 593                 if (!err)
 594                         data->in_flight++;
 595         }
 596 }
 597
 598 int usb_wwan_resume(struct usb_serial *serial)
 599 {
 600         int i, j;
 601         struct usb_serial_port *port;
 602         struct usb_wwan_intf_private *intfdata = serial->private;
 603         struct usb_wwan_port_private *portdata;
 604         struct urb *urb;
 605         int err = 0;
 606
 607         dbg("%s entered", __func__);
 608         /* get the interrupt URBs resubmitted unconditionally */
 609         for (i = 0; i < serial->num_ports; i++) {
 610                 port = serial->port[i];
 611                 if (!port->interrupt_in_urb) {
 612                         dbg("%s: No interrupt URB for port %d", __func__, i);
 613                         continue;
 614                 }
 615                 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
 616                 dbg("Submitted interrupt URB for port %d (result %d)", i, err);
 617                 if (err < 0) {
 618                         err("%s: Error %d for interrupt URB of port%d",
 619                             __func__, err, i);
 620                         goto err_out;
 621                 }
 622         }
 623
 624         for (i = 0; i < serial->num_ports; i++) {
 625                 /* walk all ports */
 626                 port = serial->port[i];
 627                 portdata = usb_get_serial_port_data(port);
 628
 629                 /* skip closed ports */
 630                 spin_lock_irq(&intfdata->susp_lock);
 631                 if (!portdata->opened) {
 632                         spin_unlock_irq(&intfdata->susp_lock);
 633                         continue;
 634                 }
 635
 636                 for (j = 0; j < N_IN_URB; j++) {
 637                         urb = portdata->in_urbs[j];
 638                         err = usb_submit_urb(urb, GFP_ATOMIC);
 639                         if (err < 0) {
 640                                 err("%s: Error %d for bulk URB %d",
 641                                     __func__, err, i);
 642                                 spin_unlock_irq(&intfdata->susp_lock);
 643                                 goto err_out;
 644                         }
 645                 }
 646                 play_delayed(port);
 647                 spin_unlock_irq(&intfdata->susp_lock);
 648         }
 649         spin_lock_irq(&intfdata->susp_lock);
 650         intfdata->suspended = 0;
 651         spin_unlock_irq(&intfdata->susp_lock);
 652 err_out:
 653         return err;
 654 }
 655 EXPORT_SYMBOL(usb_wwan_resume);
 656 #endif
 657
 658 MODULE_AUTHOR(DRIVER_AUTHOR);
 659 MODULE_DESCRIPTION(DRIVER_DESC);
 660 MODULE_VERSION(DRIVER_VERSION);
 661 MODULE_LICENSE("GPL");
 662
 663 module_param(debug, bool, S_IRUGO | S_IWUSR);
 664 MODULE_PARM_DESC(debug, "Debug messages");