drivers/usb/serial/usb_wwan.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3   USB Driver layer for GSM modems
   4
   5   Copyright (C) 2005  Matthias Urlichs <smurf@smurf.noris.de>
   6
   7   Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
   8
   9   History: see the git log.
  10
  11   Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
  12
  13   This driver exists because the "normal" serial driver doesn't work too well
  14   with GSM modems. Issues:
  15   - data loss -- one single Receive URB is not nearly enough
  16   - controlling the baud rate doesn't make sense
  17 */
  18
  19 #define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
  20 #define DRIVER_DESC "USB Driver for GSM modems"
  21
  22 #include <linux/kernel.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/errno.h>
  25 #include <linux/slab.h>
  26 #include <linux/tty.h>
  27 #include <linux/tty_flip.h>
  28 #include <linux/module.h>
  29 #include <linux/bitops.h>
  30 #include <linux/uaccess.h>
  31 #include <linux/usb.h>
  32 #include <linux/usb/serial.h>
  33 #include <linux/serial.h>
  34 #include "usb-wwan.h"
  35
  36 /*
  37  * Generate DTR/RTS signals on the port using the SET_CONTROL_LINE_STATE request
  38  * in CDC ACM.
  39  */
  40 static int usb_wwan_send_setup(struct usb_serial_port *port)
  41 {
  42         struct usb_serial *serial = port->serial;
  43         struct usb_wwan_port_private *portdata;
  44         int val = 0;
  45         int ifnum;
  46         int res;
  47
  48         portdata = usb_get_serial_port_data(port);
  49
  50         if (portdata->dtr_state)
  51                 val |= 0x01;
  52         if (portdata->rts_state)
  53                 val |= 0x02;
  54
  55         ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
  56
  57         res = usb_autopm_get_interface(serial->interface);
  58         if (res)
  59                 return res;
  60
  61         res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
  62                                 0x22, 0x21, val, ifnum, NULL, 0,
  63                                 USB_CTRL_SET_TIMEOUT);
  64
  65         usb_autopm_put_interface(port->serial->interface);
  66
  67         return res;
  68 }
  69
  70 void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
  71 {
  72         struct usb_wwan_port_private *portdata;
  73         struct usb_wwan_intf_private *intfdata;
  74
  75         intfdata = usb_get_serial_data(port->serial);
  76
  77         if (!intfdata->use_send_setup)
  78                 return;
  79
  80         portdata = usb_get_serial_port_data(port);
  81         /* FIXME: locking */
  82         portdata->rts_state = on;
  83         portdata->dtr_state = on;
  84
  85         usb_wwan_send_setup(port);
  86 }
  87 EXPORT_SYMBOL(usb_wwan_dtr_rts);
  88
  89 int usb_wwan_tiocmget(struct tty_struct *tty)
  90 {
  91         struct usb_serial_port *port = tty->driver_data;
  92         unsigned int value;
  93         struct usb_wwan_port_private *portdata;
  94
  95         portdata = usb_get_serial_port_data(port);
  96
  97         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
  98             ((portdata->dtr_state) ? TIOCM_DTR : 0) |
  99             ((portdata->cts_state) ? TIOCM_CTS : 0) |
 100             ((portdata->dsr_state) ? TIOCM_DSR : 0) |
 101             ((portdata->dcd_state) ? TIOCM_CAR : 0) |
 102             ((portdata->ri_state) ? TIOCM_RNG : 0);
 103
 104         return value;
 105 }
 106 EXPORT_SYMBOL(usb_wwan_tiocmget);
 107
 108 int usb_wwan_tiocmset(struct tty_struct *tty,
 109                       unsigned int set, unsigned int clear)
 110 {
 111         struct usb_serial_port *port = tty->driver_data;
 112         struct usb_wwan_port_private *portdata;
 113         struct usb_wwan_intf_private *intfdata;
 114
 115         portdata = usb_get_serial_port_data(port);
 116         intfdata = usb_get_serial_data(port->serial);
 117
 118         if (!intfdata->use_send_setup)
 119                 return -EINVAL;
 120
 121         /* FIXME: what locks portdata fields ? */
 122         if (set & TIOCM_RTS)
 123                 portdata->rts_state = 1;
 124         if (set & TIOCM_DTR)
 125                 portdata->dtr_state = 1;
 126
 127         if (clear & TIOCM_RTS)
 128                 portdata->rts_state = 0;
 129         if (clear & TIOCM_DTR)
 130                 portdata->dtr_state = 0;
 131         return usb_wwan_send_setup(port);
 132 }
 133 EXPORT_SYMBOL(usb_wwan_tiocmset);
 134
 135 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
 136                    const unsigned char *buf, int count)
 137 {
 138         struct usb_wwan_port_private *portdata;
 139         struct usb_wwan_intf_private *intfdata;
 140         int i;
 141         int left, todo;
 142         struct urb *this_urb = NULL;    /* spurious */
 143         int err;
 144         unsigned long flags;
 145
 146         portdata = usb_get_serial_port_data(port);
 147         intfdata = usb_get_serial_data(port->serial);
 148
 149         dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
 150
 151         i = 0;
 152         left = count;
 153         for (i = 0; left > 0 && i < N_OUT_URB; i++) {
 154                 todo = left;
 155                 if (todo > OUT_BUFLEN)
 156                         todo = OUT_BUFLEN;
 157
 158                 this_urb = portdata->out_urbs[i];
 159                 if (test_and_set_bit(i, &portdata->out_busy)) {
 160                         if (time_before(jiffies,
 161                                         portdata->tx_start_time[i] + 10 * HZ))
 162                                 continue;
 163                         usb_unlink_urb(this_urb);
 164                         continue;
 165                 }
 166                 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
 167                         usb_pipeendpoint(this_urb->pipe), i);
 168
 169                 err = usb_autopm_get_interface_async(port->serial->interface);
 170                 if (err < 0) {
 171                         clear_bit(i, &portdata->out_busy);
 172                         break;
 173                 }
 174
 175                 /* send the data */
 176                 memcpy(this_urb->transfer_buffer, buf, todo);
 177                 this_urb->transfer_buffer_length = todo;
 178
 179                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 180                 if (intfdata->suspended) {
 181                         usb_anchor_urb(this_urb, &portdata->delayed);
 182                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 183                 } else {
 184                         intfdata->in_flight++;
 185                         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 186                         err = usb_submit_urb(this_urb, GFP_ATOMIC);
 187                         if (err) {
 188                                 dev_err(&port->dev,
 189                                         "%s: submit urb %d failed: %d\n",
 190                                         __func__, i, err);
 191                                 clear_bit(i, &portdata->out_busy);
 192                                 spin_lock_irqsave(&intfdata->susp_lock, flags);
 193                                 intfdata->in_flight--;
 194                                 spin_unlock_irqrestore(&intfdata->susp_lock,
 195                                                        flags);
 196                                 usb_autopm_put_interface_async(port->serial->interface);
 197                                 break;
 198                         }
 199                 }
 200
 201                 portdata->tx_start_time[i] = jiffies;
 202                 buf += todo;
 203                 left -= todo;
 204         }
 205
 206         count -= left;
 207         dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
 208         return count;
 209 }
 210 EXPORT_SYMBOL(usb_wwan_write);
 211
 212 static void usb_wwan_indat_callback(struct urb *urb)
 213 {
 214         int err;
 215         int endpoint;
 216         struct usb_serial_port *port;
 217         struct device *dev;
 218         unsigned char *data = urb->transfer_buffer;
 219         int status = urb->status;
 220
 221         endpoint = usb_pipeendpoint(urb->pipe);
 222         port = urb->context;
 223         dev = &port->dev;
 224
 225         if (status) {
 226                 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
 227                         __func__, status, endpoint);
 228
 229                 /* don't resubmit on fatal errors */
 230                 if (status == -ESHUTDOWN || status == -ENOENT)
 231                         return;
 232         } else {
 233                 if (urb->actual_length) {
 234                         tty_insert_flip_string(&port->port, data,
 235                                         urb->actual_length);
 236                         tty_flip_buffer_push(&port->port);
 237                 } else
 238                         dev_dbg(dev, "%s: empty read urb received\n", __func__);
 239         }
 240         /* Resubmit urb so we continue receiving */
 241         err = usb_submit_urb(urb, GFP_ATOMIC);
 242         if (err) {
 243                 if (err != -EPERM && err != -ENODEV) {
 244                         dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
 245                                 __func__, err);
 246                         /* busy also in error unless we are killed */
 247                         usb_mark_last_busy(port->serial->dev);
 248                 }
 249         } else {
 250                 usb_mark_last_busy(port->serial->dev);
 251         }
 252 }
 253
 254 static void usb_wwan_outdat_callback(struct urb *urb)
 255 {
 256         struct usb_serial_port *port;
 257         struct usb_wwan_port_private *portdata;
 258         struct usb_wwan_intf_private *intfdata;
 259         unsigned long flags;
 260         int i;
 261
 262         port = urb->context;
 263         intfdata = usb_get_serial_data(port->serial);
 264
 265         usb_serial_port_softint(port);
 266         usb_autopm_put_interface_async(port->serial->interface);
 267         portdata = usb_get_serial_port_data(port);
 268         spin_lock_irqsave(&intfdata->susp_lock, flags);
 269         intfdata->in_flight--;
 270         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 271
 272         for (i = 0; i < N_OUT_URB; ++i) {
 273                 if (portdata->out_urbs[i] == urb) {
 274                         smp_mb__before_atomic();
 275                         clear_bit(i, &portdata->out_busy);
 276                         break;
 277                 }
 278         }
 279 }
 280
 281 unsigned int usb_wwan_write_room(struct tty_struct *tty)
 282 {
 283         struct usb_serial_port *port = tty->driver_data;
 284         struct usb_wwan_port_private *portdata;
 285         int i;
 286         unsigned int data_len = 0;
 287         struct urb *this_urb;
 288
 289         portdata = usb_get_serial_port_data(port);
 290
 291         for (i = 0; i < N_OUT_URB; i++) {
 292                 this_urb = portdata->out_urbs[i];
 293                 if (this_urb && !test_bit(i, &portdata->out_busy))
 294                         data_len += OUT_BUFLEN;
 295         }
 296
 297         dev_dbg(&port->dev, "%s: %u\n", __func__, data_len);
 298         return data_len;
 299 }
 300 EXPORT_SYMBOL(usb_wwan_write_room);
 301
 302 unsigned int usb_wwan_chars_in_buffer(struct tty_struct *tty)
 303 {
 304         struct usb_serial_port *port = tty->driver_data;
 305         struct usb_wwan_port_private *portdata;
 306         int i;
 307         unsigned int data_len = 0;
 308         struct urb *this_urb;
 309
 310         portdata = usb_get_serial_port_data(port);
 311
 312         for (i = 0; i < N_OUT_URB; i++) {
 313                 this_urb = portdata->out_urbs[i];
 314                 /* FIXME: This locking is insufficient as this_urb may
 315                    go unused during the test */
 316                 if (this_urb && test_bit(i, &portdata->out_busy))
 317                         data_len += this_urb->transfer_buffer_length;
 318         }
 319         dev_dbg(&port->dev, "%s: %u\n", __func__, data_len);
 320         return data_len;
 321 }
 322 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
 323
 324 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
 325 {
 326         struct usb_wwan_port_private *portdata;
 327         struct usb_wwan_intf_private *intfdata;
 328         struct usb_serial *serial = port->serial;
 329         int i, err;
 330         struct urb *urb;
 331
 332         portdata = usb_get_serial_port_data(port);
 333         intfdata = usb_get_serial_data(serial);
 334
 335         if (port->interrupt_in_urb) {
 336                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 337                 if (err) {
 338                         dev_err(&port->dev, "%s: submit int urb failed: %d\n",
 339                                 __func__, err);
 340                 }
 341         }
 342
 343         /* Start reading from the IN endpoint */
 344         for (i = 0; i < N_IN_URB; i++) {
 345                 urb = portdata->in_urbs[i];
 346                 if (!urb)
 347                         continue;
 348                 err = usb_submit_urb(urb, GFP_KERNEL);
 349                 if (err) {
 350                         dev_err(&port->dev,
 351                                 "%s: submit read urb %d failed: %d\n",
 352                                 __func__, i, err);
 353                 }
 354         }
 355
 356         spin_lock_irq(&intfdata->susp_lock);
 357         if (++intfdata->open_ports == 1)
 358                 serial->interface->needs_remote_wakeup = 1;
 359         spin_unlock_irq(&intfdata->susp_lock);
 360         /* this balances a get in the generic USB serial code */
 361         usb_autopm_put_interface(serial->interface);
 362
 363         return 0;
 364 }
 365 EXPORT_SYMBOL(usb_wwan_open);
 366
 367 static void unbusy_queued_urb(struct urb *urb,
 368                                         struct usb_wwan_port_private *portdata)
 369 {
 370         int i;
 371
 372         for (i = 0; i < N_OUT_URB; i++) {
 373                 if (urb == portdata->out_urbs[i]) {
 374                         clear_bit(i, &portdata->out_busy);
 375                         break;
 376                 }
 377         }
 378 }
 379
 380 void usb_wwan_close(struct usb_serial_port *port)
 381 {
 382         int i;
 383         struct usb_serial *serial = port->serial;
 384         struct usb_wwan_port_private *portdata;
 385         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 386         struct urb *urb;
 387
 388         portdata = usb_get_serial_port_data(port);
 389
 390         /*
 391          * Need to take susp_lock to make sure port is not already being
 392          * resumed, but no need to hold it due to the tty-port initialized
 393          * flag.
 394          */
 395         spin_lock_irq(&intfdata->susp_lock);
 396         if (--intfdata->open_ports == 0)
 397                 serial->interface->needs_remote_wakeup = 0;
 398         spin_unlock_irq(&intfdata->susp_lock);
 399
 400         for (;;) {
 401                 urb = usb_get_from_anchor(&portdata->delayed);
 402                 if (!urb)
 403                         break;
 404                 unbusy_queued_urb(urb, portdata);
 405                 usb_autopm_put_interface_async(serial->interface);
 406         }
 407
 408         for (i = 0; i < N_IN_URB; i++)
 409                 usb_kill_urb(portdata->in_urbs[i]);
 410         for (i = 0; i < N_OUT_URB; i++)
 411                 usb_kill_urb(portdata->out_urbs[i]);
 412         usb_kill_urb(port->interrupt_in_urb);
 413
 414         usb_autopm_get_interface_no_resume(serial->interface);
 415 }
 416 EXPORT_SYMBOL(usb_wwan_close);
 417
 418 static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
 419                                       int endpoint,
 420                                       int dir, void *ctx, char *buf, int len,
 421                                       void (*callback) (struct urb *))
 422 {
 423         struct usb_serial *serial = port->serial;
 424         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 425         struct urb *urb;
 426
 427         urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
 428         if (!urb)
 429                 return NULL;
 430
 431         usb_fill_bulk_urb(urb, serial->dev,
 432                           usb_sndbulkpipe(serial->dev, endpoint) | dir,
 433                           buf, len, callback, ctx);
 434
 435         if (intfdata->use_zlp && dir == USB_DIR_OUT)
 436                 urb->transfer_flags |= URB_ZERO_PACKET;
 437
 438         return urb;
 439 }
 440
 441 int usb_wwan_port_probe(struct usb_serial_port *port)
 442 {
 443         struct usb_wwan_port_private *portdata;
 444         struct urb *urb;
 445         u8 *buffer;
 446         int i;
 447
 448         if (!port->bulk_in_size || !port->bulk_out_size)
 449                 return -ENODEV;
 450
 451         portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 452         if (!portdata)
 453                 return -ENOMEM;
 454
 455         init_usb_anchor(&portdata->delayed);
 456
 457         for (i = 0; i < N_IN_URB; i++) {
 458                 buffer = (u8 *)__get_free_page(GFP_KERNEL);
 459                 if (!buffer)
 460                         goto bail_out_error;
 461                 portdata->in_buffer[i] = buffer;
 462
 463                 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
 464                                                 USB_DIR_IN, port,
 465                                                 buffer, IN_BUFLEN,
 466                                                 usb_wwan_indat_callback);
 467                 portdata->in_urbs[i] = urb;
 468         }
 469
 470         for (i = 0; i < N_OUT_URB; i++) {
 471                 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 472                 if (!buffer)
 473                         goto bail_out_error2;
 474                 portdata->out_buffer[i] = buffer;
 475
 476                 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
 477                                                 USB_DIR_OUT, port,
 478                                                 buffer, OUT_BUFLEN,
 479                                                 usb_wwan_outdat_callback);
 480                 portdata->out_urbs[i] = urb;
 481         }
 482
 483         usb_set_serial_port_data(port, portdata);
 484
 485         return 0;
 486
 487 bail_out_error2:
 488         for (i = 0; i < N_OUT_URB; i++) {
 489                 usb_free_urb(portdata->out_urbs[i]);
 490                 kfree(portdata->out_buffer[i]);
 491         }
 492 bail_out_error:
 493         for (i = 0; i < N_IN_URB; i++) {
 494                 usb_free_urb(portdata->in_urbs[i]);
 495                 free_page((unsigned long)portdata->in_buffer[i]);
 496         }
 497         kfree(portdata);
 498
 499         return -ENOMEM;
 500 }
 501 EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
 502
 503 void usb_wwan_port_remove(struct usb_serial_port *port)
 504 {
 505         int i;
 506         struct usb_wwan_port_private *portdata;
 507
 508         portdata = usb_get_serial_port_data(port);
 509         usb_set_serial_port_data(port, NULL);
 510
 511         for (i = 0; i < N_IN_URB; i++) {
 512                 usb_free_urb(portdata->in_urbs[i]);
 513                 free_page((unsigned long)portdata->in_buffer[i]);
 514         }
 515         for (i = 0; i < N_OUT_URB; i++) {
 516                 usb_free_urb(portdata->out_urbs[i]);
 517                 kfree(portdata->out_buffer[i]);
 518         }
 519
 520         kfree(portdata);
 521 }
 522 EXPORT_SYMBOL(usb_wwan_port_remove);
 523
 524 #ifdef CONFIG_PM
 525 static void stop_urbs(struct usb_serial *serial)
 526 {
 527         int i, j;
 528         struct usb_serial_port *port;
 529         struct usb_wwan_port_private *portdata;
 530
 531         for (i = 0; i < serial->num_ports; ++i) {
 532                 port = serial->port[i];
 533                 portdata = usb_get_serial_port_data(port);
 534                 if (!portdata)
 535                         continue;
 536                 for (j = 0; j < N_IN_URB; j++)
 537                         usb_kill_urb(portdata->in_urbs[j]);
 538                 for (j = 0; j < N_OUT_URB; j++)
 539                         usb_kill_urb(portdata->out_urbs[j]);
 540                 usb_kill_urb(port->interrupt_in_urb);
 541         }
 542 }
 543
 544 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
 545 {
 546         struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 547
 548         spin_lock_irq(&intfdata->susp_lock);
 549         if (PMSG_IS_AUTO(message)) {
 550                 if (intfdata->in_flight) {
 551                         spin_unlock_irq(&intfdata->susp_lock);
 552                         return -EBUSY;
 553                 }
 554         }
 555         intfdata->suspended = 1;
 556         spin_unlock_irq(&intfdata->susp_lock);
 557
 558         stop_urbs(serial);
 559
 560         return 0;
 561 }
 562 EXPORT_SYMBOL(usb_wwan_suspend);
 563
 564 /* Caller must hold susp_lock. */
 565 static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
 566 {
 567         struct usb_serial *serial = port->serial;
 568         struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
 569         struct usb_wwan_port_private *portdata;
 570         struct urb *urb;
 571         int err_count = 0;
 572         int err;
 573
 574         portdata = usb_get_serial_port_data(port);
 575
 576         for (;;) {
 577                 urb = usb_get_from_anchor(&portdata->delayed);
 578                 if (!urb)
 579                         break;
 580
 581                 err = usb_submit_urb(urb, GFP_ATOMIC);
 582                 if (err) {
 583                         dev_err(&port->dev, "%s: submit urb failed: %d\n",
 584                                         __func__, err);
 585                         err_count++;
 586                         unbusy_queued_urb(urb, portdata);
 587                         usb_autopm_put_interface_async(serial->interface);
 588                         continue;
 589                 }
 590                 data->in_flight++;
 591         }
 592
 593         if (err_count)
 594                 return -EIO;
 595
 596         return 0;
 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 = usb_get_serial_data(serial);
 604         struct usb_wwan_port_private *portdata;
 605         struct urb *urb;
 606         int err;
 607         int err_count = 0;
 608
 609         spin_lock_irq(&intfdata->susp_lock);
 610         for (i = 0; i < serial->num_ports; i++) {
 611                 port = serial->port[i];
 612
 613                 if (!tty_port_initialized(&port->port))
 614                         continue;
 615
 616                 portdata = usb_get_serial_port_data(port);
 617
 618                 if (port->interrupt_in_urb) {
 619                         err = usb_submit_urb(port->interrupt_in_urb,
 620                                         GFP_ATOMIC);
 621                         if (err) {
 622                                 dev_err(&port->dev,
 623                                         "%s: submit int urb failed: %d\n",
 624                                         __func__, err);
 625                                 err_count++;
 626                         }
 627                 }
 628
 629                 err = usb_wwan_submit_delayed_urbs(port);
 630                 if (err)
 631                         err_count++;
 632
 633                 for (j = 0; j < N_IN_URB; j++) {
 634                         urb = portdata->in_urbs[j];
 635                         err = usb_submit_urb(urb, GFP_ATOMIC);
 636                         if (err < 0) {
 637                                 dev_err(&port->dev,
 638                                         "%s: submit read urb %d failed: %d\n",
 639                                         __func__, i, err);
 640                                 err_count++;
 641                         }
 642                 }
 643         }
 644         intfdata->suspended = 0;
 645         spin_unlock_irq(&intfdata->susp_lock);
 646
 647         if (err_count)
 648                 return -EIO;
 649
 650         return 0;
 651 }
 652 EXPORT_SYMBOL(usb_wwan_resume);
 653 #endif
 654
 655 MODULE_AUTHOR(DRIVER_AUTHOR);
 656 MODULE_DESCRIPTION(DRIVER_DESC);
 657 MODULE_LICENSE("GPL v2");