git.oblomov.eu Git - linux-2.6/blob - drivers/net/wireless/rt2x00/rt2x00usb.c

   1 /*
   2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00usb
  23         Abstract: rt2x00 generic usb device routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/usb.h>
  29 #include <linux/bug.h>
  30
  31 #include "rt2x00.h"
  32 #include "rt2x00usb.h"
  33
  34 /*
  35  * Interfacing with the HW.
  36  */
  37 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
  38                              const u8 request, const u8 requesttype,
  39                              const u16 offset, const u16 value,
  40                              void *buffer, const u16 buffer_length,
  41                              const int timeout)
  42 {
  43         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
  44         int status;
  45         unsigned int i;
  46         unsigned int pipe =
  47             (requesttype == USB_VENDOR_REQUEST_IN) ?
  48             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
  49
  50
  51         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
  52                 status = usb_control_msg(usb_dev, pipe, request, requesttype,
  53                                          value, offset, buffer, buffer_length,
  54                                          timeout);
  55                 if (status >= 0)
  56                         return 0;
  57
  58                 /*
  59                  * Check for errors
  60                  * -ENODEV: Device has disappeared, no point continuing.
  61                  * All other errors: Try again.
  62                  */
  63                 else if (status == -ENODEV)
  64                         break;
  65         }
  66
  67         ERROR(rt2x00dev,
  68               "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
  69               request, offset, status);
  70
  71         return status;
  72 }
  73 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
  74
  75 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
  76                                    const u8 request, const u8 requesttype,
  77                                    const u16 offset, void *buffer,
  78                                    const u16 buffer_length, const int timeout)
  79 {
  80         int status;
  81
  82         BUG_ON(!mutex_is_locked(&rt2x00dev->usb_cache_mutex));
  83
  84         /*
  85          * Check for Cache availability.
  86          */
  87         if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
  88                 ERROR(rt2x00dev, "CSR cache not available.\n");
  89                 return -ENOMEM;
  90         }
  91
  92         if (requesttype == USB_VENDOR_REQUEST_OUT)
  93                 memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
  94
  95         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
  96                                           offset, 0, rt2x00dev->csr.cache,
  97                                           buffer_length, timeout);
  98
  99         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
 100                 memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
 101
 102         return status;
 103 }
 104 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
 105
 106 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 107                                   const u8 request, const u8 requesttype,
 108                                   const u16 offset, void *buffer,
 109                                   const u16 buffer_length, const int timeout)
 110 {
 111         int status;
 112
 113         mutex_lock(&rt2x00dev->usb_cache_mutex);
 114
 115         status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
 116                                                 requesttype, offset, buffer,
 117                                                 buffer_length, timeout);
 118
 119         mutex_unlock(&rt2x00dev->usb_cache_mutex);
 120
 121         return status;
 122 }
 123 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 124
 125 int rt2x00usb_vendor_request_large_buff(struct rt2x00_dev *rt2x00dev,
 126                                         const u8 request, const u8 requesttype,
 127                                         const u16 offset, const void *buffer,
 128                                         const u16 buffer_length,
 129                                         const int timeout)
 130 {
 131         int status = 0;
 132         unsigned char *tb;
 133         u16 off, len, bsize;
 134
 135         mutex_lock(&rt2x00dev->usb_cache_mutex);
 136
 137         tb  = (char *)buffer;
 138         off = offset;
 139         len = buffer_length;
 140         while (len && !status) {
 141                 bsize = min_t(u16, CSR_CACHE_SIZE, len);
 142                 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
 143                                                         requesttype, off, tb,
 144                                                         bsize, timeout);
 145
 146                 tb  += bsize;
 147                 len -= bsize;
 148                 off += bsize;
 149         }
 150
 151         mutex_unlock(&rt2x00dev->usb_cache_mutex);
 152
 153         return status;
 154 }
 155 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_large_buff);
 156
 157 /*
 158  * TX data handlers.
 159  */
 160 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 161 {
 162         struct queue_entry *entry = (struct queue_entry *)urb->context;
 163         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 164         struct txdone_entry_desc txdesc;
 165
 166         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 167             !test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 168                 return;
 169
 170         /*
 171          * Remove the descriptor data from the buffer.
 172          */
 173         skb_pull(entry->skb, entry->queue->desc_size);
 174
 175         /*
 176          * Obtain the status about this packet.
 177          * Note that when the status is 0 it does not mean the
 178          * frame was send out correctly. It only means the frame
 179          * was succesfully pushed to the hardware, we have no
 180          * way to determine the transmission status right now.
 181          * (Only indirectly by looking at the failed TX counters
 182          * in the register).
 183          */
 184         txdesc.flags = 0;
 185         if (!urb->status)
 186                 __set_bit(TXDONE_UNKNOWN, &txdesc.flags);
 187         else
 188                 __set_bit(TXDONE_FAILURE, &txdesc.flags);
 189         txdesc.retry = 0;
 190
 191         rt2x00lib_txdone(entry, &txdesc);
 192 }
 193
 194 int rt2x00usb_write_tx_data(struct queue_entry *entry)
 195 {
 196         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 197         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 198         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 199         struct skb_frame_desc *skbdesc;
 200         u32 length;
 201
 202         /*
 203          * Add the descriptor in front of the skb.
 204          */
 205         skb_push(entry->skb, entry->queue->desc_size);
 206         memset(entry->skb->data, 0, entry->queue->desc_size);
 207
 208         /*
 209          * Fill in skb descriptor
 210          */
 211         skbdesc = get_skb_frame_desc(entry->skb);
 212         skbdesc->desc = entry->skb->data;
 213         skbdesc->desc_len = entry->queue->desc_size;
 214
 215         /*
 216          * USB devices cannot blindly pass the skb->len as the
 217          * length of the data to usb_fill_bulk_urb. Pass the skb
 218          * to the driver to determine what the length should be.
 219          */
 220         length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, entry->skb);
 221
 222         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 223                           usb_sndbulkpipe(usb_dev, 1),
 224                           entry->skb->data, length,
 225                           rt2x00usb_interrupt_txdone, entry);
 226
 227         return 0;
 228 }
 229 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
 230
 231 static inline void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
 232 {
 233         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 234
 235         if (__test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags))
 236                 usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 237 }
 238
 239 void rt2x00usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
 240                              const enum data_queue_qid qid)
 241 {
 242         struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, qid);
 243         unsigned long irqflags;
 244         unsigned int index;
 245         unsigned int index_done;
 246         unsigned int i;
 247
 248         /*
 249          * Only protect the range we are going to loop over,
 250          * if during our loop a extra entry is set to pending
 251          * it should not be kicked during this run, since it
 252          * is part of another TX operation.
 253          */
 254         spin_lock_irqsave(&queue->lock, irqflags);
 255         index = queue->index[Q_INDEX];
 256         index_done = queue->index[Q_INDEX_DONE];
 257         spin_unlock_irqrestore(&queue->lock, irqflags);
 258
 259         /*
 260          * Start from the TX done pointer, this guarentees that we will
 261          * send out all frames in the correct order.
 262          */
 263         if (index_done < index) {
 264                 for (i = index_done; i < index; i++)
 265                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 266         } else {
 267                 for (i = index_done; i < queue->limit; i++)
 268                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 269
 270                 for (i = 0; i < index; i++)
 271                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 272         }
 273 }
 274 EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue);
 275
 276 /*
 277  * RX data handlers.
 278  */
 279 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 280 {
 281         struct queue_entry *entry = (struct queue_entry *)urb->context;
 282         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 283         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 284         u8 rxd[32];
 285
 286         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 287             !test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 288                 return;
 289
 290         /*
 291          * Check if the received data is simply too small
 292          * to be actually valid, or if the urb is signaling
 293          * a problem.
 294          */
 295         if (urb->actual_length < entry->queue->desc_size || urb->status) {
 296                 __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 297                 usb_submit_urb(urb, GFP_ATOMIC);
 298                 return;
 299         }
 300
 301         /*
 302          * Fill in desc fields of the skb descriptor
 303          */
 304         skbdesc->desc = rxd;
 305         skbdesc->desc_len = entry->queue->desc_size;
 306
 307         /*
 308          * Send the frame to rt2x00lib for further processing.
 309          */
 310         rt2x00lib_rxdone(rt2x00dev, entry);
 311 }
 312
 313 /*
 314  * Radio handlers
 315  */
 316 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 317 {
 318         struct queue_entry_priv_usb *entry_priv;
 319         struct queue_entry_priv_usb_bcn *bcn_priv;
 320         struct data_queue *queue;
 321         unsigned int i;
 322
 323         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 324                                     REGISTER_TIMEOUT);
 325
 326         /*
 327          * Cancel all queues.
 328          */
 329         queue_for_each(rt2x00dev, queue) {
 330                 for (i = 0; i < queue->limit; i++) {
 331                         entry_priv = queue->entries[i].priv_data;
 332                         usb_kill_urb(entry_priv->urb);
 333                 }
 334         }
 335
 336         /*
 337          * Kill guardian urb (if required by driver).
 338          */
 339         if (!test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 340                 return;
 341
 342         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
 343                 bcn_priv = rt2x00dev->bcn->entries[i].priv_data;
 344                 if (bcn_priv->guardian_urb)
 345                         usb_kill_urb(bcn_priv->guardian_urb);
 346         }
 347 }
 348 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 349
 350 /*
 351  * Device initialization handlers.
 352  */
 353 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
 354                             struct queue_entry *entry)
 355 {
 356         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 357         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 358
 359         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 360                           usb_rcvbulkpipe(usb_dev, 1),
 361                           entry->skb->data, entry->skb->len,
 362                           rt2x00usb_interrupt_rxdone, entry);
 363
 364         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 365         usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 366 }
 367 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
 368
 369 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
 370                             struct queue_entry *entry)
 371 {
 372         entry->flags = 0;
 373 }
 374 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
 375
 376 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 377                                struct data_queue *queue)
 378 {
 379         struct queue_entry_priv_usb *entry_priv;
 380         struct queue_entry_priv_usb_bcn *bcn_priv;
 381         unsigned int i;
 382
 383         for (i = 0; i < queue->limit; i++) {
 384                 entry_priv = queue->entries[i].priv_data;
 385                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 386                 if (!entry_priv->urb)
 387                         return -ENOMEM;
 388         }
 389
 390         /*
 391          * If this is not the beacon queue or
 392          * no guardian byte was required for the beacon,
 393          * then we are done.
 394          */
 395         if (rt2x00dev->bcn != queue ||
 396             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 397                 return 0;
 398
 399         for (i = 0; i < queue->limit; i++) {
 400                 bcn_priv = queue->entries[i].priv_data;
 401                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 402                 if (!bcn_priv->guardian_urb)
 403                         return -ENOMEM;
 404         }
 405
 406         return 0;
 407 }
 408
 409 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 410                                struct data_queue *queue)
 411 {
 412         struct queue_entry_priv_usb *entry_priv;
 413         struct queue_entry_priv_usb_bcn *bcn_priv;
 414         unsigned int i;
 415
 416         if (!queue->entries)
 417                 return;
 418
 419         for (i = 0; i < queue->limit; i++) {
 420                 entry_priv = queue->entries[i].priv_data;
 421                 usb_kill_urb(entry_priv->urb);
 422                 usb_free_urb(entry_priv->urb);
 423         }
 424
 425         /*
 426          * If this is not the beacon queue or
 427          * no guardian byte was required for the beacon,
 428          * then we are done.
 429          */
 430         if (rt2x00dev->bcn != queue ||
 431             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 432                 return;
 433
 434         for (i = 0; i < queue->limit; i++) {
 435                 bcn_priv = queue->entries[i].priv_data;
 436                 usb_kill_urb(bcn_priv->guardian_urb);
 437                 usb_free_urb(bcn_priv->guardian_urb);
 438         }
 439 }
 440
 441 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 442 {
 443         struct data_queue *queue;
 444         int status;
 445
 446         /*
 447          * Allocate DMA
 448          */
 449         queue_for_each(rt2x00dev, queue) {
 450                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
 451                 if (status)
 452                         goto exit;
 453         }
 454
 455         return 0;
 456
 457 exit:
 458         rt2x00usb_uninitialize(rt2x00dev);
 459
 460         return status;
 461 }
 462 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 463
 464 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 465 {
 466         struct data_queue *queue;
 467
 468         queue_for_each(rt2x00dev, queue)
 469                 rt2x00usb_free_urb(rt2x00dev, queue);
 470 }
 471 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 472
 473 /*
 474  * USB driver handlers.
 475  */
 476 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 477 {
 478         kfree(rt2x00dev->rf);
 479         rt2x00dev->rf = NULL;
 480
 481         kfree(rt2x00dev->eeprom);
 482         rt2x00dev->eeprom = NULL;
 483
 484         kfree(rt2x00dev->csr.cache);
 485         rt2x00dev->csr.cache = NULL;
 486 }
 487
 488 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 489 {
 490         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 491         if (!rt2x00dev->csr.cache)
 492                 goto exit;
 493
 494         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 495         if (!rt2x00dev->eeprom)
 496                 goto exit;
 497
 498         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 499         if (!rt2x00dev->rf)
 500                 goto exit;
 501
 502         return 0;
 503
 504 exit:
 505         ERROR_PROBE("Failed to allocate registers.\n");
 506
 507         rt2x00usb_free_reg(rt2x00dev);
 508
 509         return -ENOMEM;
 510 }
 511
 512 int rt2x00usb_probe(struct usb_interface *usb_intf,
 513                     const struct usb_device_id *id)
 514 {
 515         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 516         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 517         struct ieee80211_hw *hw;
 518         struct rt2x00_dev *rt2x00dev;
 519         int retval;
 520
 521         usb_dev = usb_get_dev(usb_dev);
 522
 523         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 524         if (!hw) {
 525                 ERROR_PROBE("Failed to allocate hardware.\n");
 526                 retval = -ENOMEM;
 527                 goto exit_put_device;
 528         }
 529
 530         usb_set_intfdata(usb_intf, hw);
 531
 532         rt2x00dev = hw->priv;
 533         rt2x00dev->dev = &usb_intf->dev;
 534         rt2x00dev->ops = ops;
 535         rt2x00dev->hw = hw;
 536         mutex_init(&rt2x00dev->usb_cache_mutex);
 537
 538         rt2x00dev->usb_maxpacket =
 539             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
 540         if (!rt2x00dev->usb_maxpacket)
 541                 rt2x00dev->usb_maxpacket = 1;
 542
 543         retval = rt2x00usb_alloc_reg(rt2x00dev);
 544         if (retval)
 545                 goto exit_free_device;
 546
 547         retval = rt2x00lib_probe_dev(rt2x00dev);
 548         if (retval)
 549                 goto exit_free_reg;
 550
 551         return 0;
 552
 553 exit_free_reg:
 554         rt2x00usb_free_reg(rt2x00dev);
 555
 556 exit_free_device:
 557         ieee80211_free_hw(hw);
 558
 559 exit_put_device:
 560         usb_put_dev(usb_dev);
 561
 562         usb_set_intfdata(usb_intf, NULL);
 563
 564         return retval;
 565 }
 566 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 567
 568 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 569 {
 570         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 571         struct rt2x00_dev *rt2x00dev = hw->priv;
 572
 573         /*
 574          * Free all allocated data.
 575          */
 576         rt2x00lib_remove_dev(rt2x00dev);
 577         rt2x00usb_free_reg(rt2x00dev);
 578         ieee80211_free_hw(hw);
 579
 580         /*
 581          * Free the USB device data.
 582          */
 583         usb_set_intfdata(usb_intf, NULL);
 584         usb_put_dev(interface_to_usbdev(usb_intf));
 585 }
 586 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 587
 588 #ifdef CONFIG_PM
 589 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 590 {
 591         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 592         struct rt2x00_dev *rt2x00dev = hw->priv;
 593         int retval;
 594
 595         retval = rt2x00lib_suspend(rt2x00dev, state);
 596         if (retval)
 597                 return retval;
 598
 599         rt2x00usb_free_reg(rt2x00dev);
 600
 601         /*
 602          * Decrease usbdev refcount.
 603          */
 604         usb_put_dev(interface_to_usbdev(usb_intf));
 605
 606         return 0;
 607 }
 608 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 609
 610 int rt2x00usb_resume(struct usb_interface *usb_intf)
 611 {
 612         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 613         struct rt2x00_dev *rt2x00dev = hw->priv;
 614         int retval;
 615
 616         usb_get_dev(interface_to_usbdev(usb_intf));
 617
 618         retval = rt2x00usb_alloc_reg(rt2x00dev);
 619         if (retval)
 620                 return retval;
 621
 622         retval = rt2x00lib_resume(rt2x00dev);
 623         if (retval)
 624                 goto exit_free_reg;
 625
 626         return 0;
 627
 628 exit_free_reg:
 629         rt2x00usb_free_reg(rt2x00dev);
 630
 631         return retval;
 632 }
 633 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 634 #endif /* CONFIG_PM */
 635
 636 /*
 637  * rt2x00usb module information.
 638  */
 639 MODULE_AUTHOR(DRV_PROJECT);
 640 MODULE_VERSION(DRV_VERSION);
 641 MODULE_DESCRIPTION("rt2x00 usb library");
 642 MODULE_LICENSE("GPL");