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         return;
 238 }
 239
 240 static void usb_wwan_outdat_callback(struct urb *urb)
 241 {
 242         struct usb_serial_port *port;
 243         struct usb_wwan_port_private *portdata;
 244         struct usb_wwan_intf_private *intfdata;
 245         int i;
 246
 247         dbg("%s", __func__);
 248
 249         port = urb->context;
 250         intfdata = port->serial->private;
 251
 252         usb_serial_port_softint(port);
 253         usb_autopm_put_interface_async(port->serial->interface);
 254         portdata = usb_get_serial_port_data(port);
 255         spin_lock(&intfdata->susp_lock);
 256         intfdata->in_flight--;
 257         spin_unlock(&intfdata->susp_lock);
 258
 259         for (i = 0; i < N_OUT_URB; ++i) {
 260                 if (portdata->out_urbs[i] == urb) {
 261                         smp_mb__before_clear_bit();
 262                         clear_bit(i, &portdata->out_busy);
 263                         break;
 264                 }
 265         }
 266 }
 267
 268 int usb_wwan_write_room(struct tty_struct *tty)
 269 {
 270         struct usb_serial_port *port = tty->driver_data;
 271         struct usb_wwan_port_private *portdata;
 272         int i;
 273         int data_len = 0;
 274         struct urb *this_urb;
 275
 276         portdata = usb_get_serial_port_data(port);
 277
 278         for (i = 0; i < N_OUT_URB; i++) {
 279                 this_urb = portdata->out_urbs[i];
 280                 if (this_urb && !test_bit(i, &portdata->out_busy))
 281                         data_len += OUT_BUFLEN;
 282         }
 283
 284         dbg("%s: %d", __func__, data_len);
 285         return data_len;
 286 }
 287 EXPORT_SYMBOL(usb_wwan_write_room);
 288
 289 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 290 {
 291         struct usb_serial_port *port = tty->driver_data;
 292         struct usb_wwan_port_private *portdata;
 293         int i;
 294         int data_len = 0;
 295         struct urb *this_urb;
 296
 297         portdata = usb_get_serial_port_data(port);
 298
 299         for (i = 0; i < N_OUT_URB; i++) {
 300                 this_urb = portdata->out_urbs[i];
 301                 /* FIXME: This locking is insufficient as this_urb may
 302                    go unused during the test */
 303                 if (this_urb && test_bit(i, &portdata->out_busy))
 304                         data_len += this_urb->transfer_buffer_length;
 305         }
 306         dbg("%s: %d", __func__, data_len);
 307         return data_len;
 308 }
 309 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 310
 311 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 312 {
 313         struct usb_wwan_port_private *portdata;
 314         struct usb_wwan_intf_private *intfdata;
 315         struct usb_serial *serial = port->serial;
 316         int i, err;
 317         struct urb *urb;
 318
 319         portdata = usb_get_serial_port_data(port);
 320         intfdata = serial->private;
 321
 322         dbg("%s", __func__);
 323
 324         /* Start reading from the IN endpoint */
 325         for (i = 0; i < N_IN_URB; i++) {
 326                 urb = portdata->in_urbs[i];
 327                 if (!urb)
 328                         continue;
 329                 err = usb_submit_urb(urb, GFP_KERNEL);
 330                 if (err) {
 331                         dbg("%s: submit urb %d failed (%d) %d",
 332                             __func__, i, err, urb->transfer_buffer_length);
 333                 }
 334         }
 335
 336         if (intfdata->send_setup)
 337                 intfdata->send_setup(port);
 338
 339         serial->interface->needs_remote_wakeup = 1;
 340         spin_lock_irq(&intfdata->susp_lock);
 341         portdata->opened = 1;
 342         spin_unlock_irq(&intfdata->susp_lock);
 343         usb_autopm_put_interface(serial->interface);
 344
 345         return 0;
 346 }
 347 EXPORT_SYMBOL(usb_wwan_open);
 348
 349 void usb_wwan_close(struct usb_serial_port *port)
 350 {
 351         int i;
 352         struct usb_serial *serial = port->serial;
 353         struct usb_wwan_port_private *portdata;
 354         struct usb_wwan_intf_private *intfdata = port->serial->private;
 355
 356         dbg("%s", __func__);
 357         portdata = usb_get_serial_port_data(port);
 358
 359         if (serial->dev) {
 360                 /* Stop reading/writing urbs */
 361                 spin_lock_irq(&intfdata->susp_lock);
 362                 portdata->opened = 0;
 363                 spin_unlock_irq(&intfdata->susp_lock);
 364
 365                 for (i = 0; i < N_IN_URB; i++)
 366                         usb_kill_urb(portdata->in_urbs[i]);
 367                 for (i = 0; i < N_OUT_URB; i++)
 368                         usb_kill_urb(portdata->out_urbs[i]);
 369                 usb_autopm_get_interface(serial->interface);
 370                 serial->interface->needs_remote_wakeup = 0;
 371         }
 372 }
 373 EXPORT_SYMBOL(usb_wwan_close);
 374
 375 /* Helper functions used by usb_wwan_setup_urbs */
 376 static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
 377                                       int dir, void *ctx, char *buf, int len,
 378                                       void (*callback) (struct urb *))
 379 {
 380         struct urb *urb;
 381
 382         if (endpoint == -1)
 383                 return NULL;    /* endpoint not needed */
 384
 385         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 386         if (urb == NULL) {
 387                 dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
 388                 return NULL;
 389         }
 390
 391         /* Fill URB using supplied data. */
 392         usb_fill_bulk_urb(urb, serial->dev,
 393                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 394                           buf, len, callback, ctx);
 395
 396         return urb;
 397 }
 398
 399 /* Setup urbs */
 400 static void usb_wwan_setup_urbs(struct usb_serial *serial)
 401 {
 402         int i, j;
 403         struct usb_serial_port *port;
 404         struct usb_wwan_port_private *portdata;
 405
 406         dbg("%s", __func__);
 407
 408         for (i = 0; i < serial->num_ports; i++) {
 409                 port = serial->port[i];
 410                 portdata = usb_get_serial_port_data(port);
 411
 412                 /* Do indat endpoints first */
 413                 for (j = 0; j < N_IN_URB; ++j) {
 414                         portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
 415                                                                   port->
 416                                                                   bulk_in_endpointAddress,
 417                                                                   USB_DIR_IN,
 418                                                                   port,
 419                                                                   portdata->
 420                                                                   in_buffer[j],
 421                                                                   IN_BUFLEN,
 422                                                                   usb_wwan_indat_callback);
 423                 }
 424
 425                 /* outdat endpoints */
 426                 for (j = 0; j < N_OUT_URB; ++j) {
 427                         portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
 428                                                                    port->
 429                                                                    bulk_out_endpointAddress,
 430                                                                    USB_DIR_OUT,
 431                                                                    port,
 432                                                                    portdata->
 433                                                                    out_buffer
 434                                                                    [j],
 435                                                                    OUT_BUFLEN,
 436                                                                    usb_wwan_outdat_callback);
 437                 }
 438         }
 439 }
 440
 441 int usb_wwan_startup(struct usb_serial *serial)
 442 {
 443         int i, j, err;
 444         struct usb_serial_port *port;
 445         struct usb_wwan_port_private *portdata;
 446         u8 *buffer;
 447
 448         dbg("%s", __func__);
 449
 450         /* Now setup per port private data */
 451         for (i = 0; i < serial->num_ports; i++) {
 452                 port = serial->port[i];
 453                 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 454                 if (!portdata) {
 455                         dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
 456                             __func__, i);
 457                         return 1;
 458                 }
 459                 init_usb_anchor(&portdata->delayed);
 460
 461                 for (j = 0; j < N_IN_URB; j++) {
 462                         buffer = (u8 *) __get_free_page(GFP_KERNEL);
 463                         if (!buffer)
 464                                 goto bail_out_error;
 465                         portdata->in_buffer[j] = buffer;
 466                 }
 467
 468                 for (j = 0; j < N_OUT_URB; j++) {
 469                         buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 470                         if (!buffer)
 471                                 goto bail_out_error2;
 472                         portdata->out_buffer[j] = buffer;
 473                 }
 474
 475                 usb_set_serial_port_data(port, portdata);
 476
 477                 if (!port->interrupt_in_urb)
 478                         continue;
 479                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 480                 if (err)
 481                         dbg("%s: submit irq_in urb failed %d", __func__, err);
 482         }
 483         usb_wwan_setup_urbs(serial);
 484         return 0;
 485
 486 bail_out_error2:
 487         for (j = 0; j < N_OUT_URB; j++)
 488                 kfree(portdata->out_buffer[j]);
 489 bail_out_error:
 490         for (j = 0; j < N_IN_URB; j++)
 491                 if (portdata->in_buffer[j])
 492                         free_page((unsigned long)portdata->in_buffer[j]);
 493         kfree(portdata);
 494         return 1;
 495 }
 496 EXPORT_SYMBOL(usb_wwan_startup);
 497
 498 static void stop_read_write_urbs(struct usb_serial *serial)
 499 {
 500         int i, j;
 501         struct usb_serial_port *port;
 502         struct usb_wwan_port_private *portdata;
 503
 504         /* Stop reading/writing urbs */
 505         for (i = 0; i < serial->num_ports; ++i) {
 506                 port = serial->port[i];
 507                 portdata = usb_get_serial_port_data(port);
 508                 for (j = 0; j < N_IN_URB; j++)
 509                         usb_kill_urb(portdata->in_urbs[j]);
 510                 for (j = 0; j < N_OUT_URB; j++)
 511                         usb_kill_urb(portdata->out_urbs[j]);
 512         }
 513 }
 514
 515 void usb_wwan_disconnect(struct usb_serial *serial)
 516 {
 517         dbg("%s", __func__);
 518
 519         stop_read_write_urbs(serial);
 520 }
 521 EXPORT_SYMBOL(usb_wwan_disconnect);
 522
 523 void usb_wwan_release(struct usb_serial *serial)
 524 {
 525         int i, j;
 526         struct usb_serial_port *port;
 527         struct usb_wwan_port_private *portdata;
 528
 529         dbg("%s", __func__);
 530
 531         /* Now free them */
 532         for (i = 0; i < serial->num_ports; ++i) {
 533                 port = serial->port[i];
 534                 portdata = usb_get_serial_port_data(port);
 535
 536                 for (j = 0; j < N_IN_URB; j++) {
 537                         usb_free_urb(portdata->in_urbs[j]);
 538                         free_page((unsigned long)
 539                                   portdata->in_buffer[j]);
 540                         portdata->in_urbs[j] = NULL;
 541                 }
 542                 for (j = 0; j < N_OUT_URB; j++) {
 543                         usb_free_urb(portdata->out_urbs[j]);
 544                         kfree(portdata->out_buffer[j]);
 545                         portdata->out_urbs[j] = NULL;
 546                 }
 547         }
 548
 549         /* Now free per port private data */
 550         for (i = 0; i < serial->num_ports; i++) {
 551                 port = serial->port[i];
 552                 kfree(usb_get_serial_port_data(port));
 553         }
 554 }
 555 EXPORT_SYMBOL(usb_wwan_release);
 556
 557 #ifdef CONFIG_PM
 558 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 559 {
 560         struct usb_wwan_intf_private *intfdata = serial->private;
 561         int b;
 562
 563         dbg("%s entered", __func__);
 564
 565         if (message.event & PM_EVENT_AUTO) {
 566                 spin_lock_irq(&intfdata->susp_lock);
 567                 b = intfdata->in_flight;
 568                 spin_unlock_irq(&intfdata->susp_lock);
 569
 570                 if (b)
 571                         return -EBUSY;
 572         }
 573
 574         spin_lock_irq(&intfdata->susp_lock);
 575         intfdata->suspended = 1;
 576         spin_unlock_irq(&intfdata->susp_lock);
 577         stop_read_write_urbs(serial);
 578
 579         return 0;
 580 }
 581 EXPORT_SYMBOL(usb_wwan_suspend);
 582
 583 static void play_delayed(struct usb_serial_port *port)
 584 {
 585         struct usb_wwan_intf_private *data;
 586         struct usb_wwan_port_private *portdata;
 587         struct urb *urb;
 588         int err;
 589
 590         portdata = usb_get_serial_port_data(port);
 591         data = port->serial->private;
 592         while ((urb = usb_get_from_anchor(&portdata->delayed))) {
 593                 err = usb_submit_urb(urb, GFP_ATOMIC);
 594                 if (!err)
 595                         data->in_flight++;
 596         }
 597 }
 598
 599 int usb_wwan_resume(struct usb_serial *serial)
 600 {
 601         int i, j;
 602         struct usb_serial_port *port;
 603         struct usb_wwan_intf_private *intfdata = serial->private;
 604         struct usb_wwan_port_private *portdata;
 605         struct urb *urb;
 606         int err = 0;
 607
 608         dbg("%s entered", __func__);
 609         /* get the interrupt URBs resubmitted unconditionally */
 610         for (i = 0; i < serial->num_ports; i++) {
 611                 port = serial->port[i];
 612                 if (!port->interrupt_in_urb) {
 613                         dbg("%s: No interrupt URB for port %d", __func__, i);
 614                         continue;
 615                 }
 616                 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
 617                 dbg("Submitted interrupt URB for port %d (result %d)", i, err);
 618                 if (err < 0) {
 619                         err("%s: Error %d for interrupt URB of port%d",
 620                             __func__, err, i);
 621                         goto err_out;
 622                 }
 623         }
 624
 625         for (i = 0; i < serial->num_ports; i++) {
 626                 /* walk all ports */
 627                 port = serial->port[i];
 628                 portdata = usb_get_serial_port_data(port);
 629
 630                 /* skip closed ports */
 631                 spin_lock_irq(&intfdata->susp_lock);
 632                 if (!portdata->opened) {
 633                         spin_unlock_irq(&intfdata->susp_lock);
 634                         continue;
 635                 }
 636
 637                 for (j = 0; j < N_IN_URB; j++) {
 638                         urb = portdata->in_urbs[j];
 639                         err = usb_submit_urb(urb, GFP_ATOMIC);
 640                         if (err < 0) {
 641                                 err("%s: Error %d for bulk URB %d",
 642                                     __func__, err, i);
 643                                 spin_unlock_irq(&intfdata->susp_lock);
 644                                 goto err_out;
 645                         }
 646                 }
 647                 play_delayed(port);
 648                 spin_unlock_irq(&intfdata->susp_lock);
 649         }
 650         spin_lock_irq(&intfdata->susp_lock);
 651         intfdata->suspended = 0;
 652         spin_unlock_irq(&intfdata->susp_lock);
 653 err_out:
 654         return err;
 655 }
 656 EXPORT_SYMBOL(usb_wwan_resume);
 657 #endif
 658
 659 MODULE_AUTHOR(DRIVER_AUTHOR);
 660 MODULE_DESCRIPTION(DRIVER_DESC);
 661 MODULE_VERSION(DRIVER_VERSION);
 662 MODULE_LICENSE("GPL");
 663
 664 module_param(debug, bool, S_IRUGO | S_IWUSR);
 665 MODULE_PARM_DESC(debug, "Debug messages");