err.no 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 = rt2x00dev_usb_dev(rt2x00dev);
  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 /*
 126  * TX data handlers.
 127  */
 128 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 129 {
 130         struct queue_entry *entry = (struct queue_entry *)urb->context;
 131         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 132         struct queue_entry_priv_usb_tx *priv_tx = entry->priv_data;
 133         struct txdone_entry_desc txdesc;
 134         __le32 *txd = (__le32 *)entry->skb->data;
 135         u32 word;
 136
 137         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 138             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 139                 return;
 140
 141         rt2x00_desc_read(txd, 0, &word);
 142
 143         /*
 144          * Remove the descriptor data from the buffer.
 145          */
 146         skb_pull(entry->skb, entry->queue->desc_size);
 147
 148         /*
 149          * Obtain the status about this packet.
 150          */
 151         txdesc.status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY;
 152         txdesc.retry = 0;
 153         txdesc.control = &priv_tx->control;
 154
 155         rt2x00lib_txdone(entry, &txdesc);
 156
 157         /*
 158          * Make this entry available for reuse.
 159          */
 160         entry->flags = 0;
 161         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 162
 163         /*
 164          * If the data queue was full before the txdone handler
 165          * we must make sure the packet queue in the mac80211 stack
 166          * is reenabled when the txdone handler has finished.
 167          */
 168         if (!rt2x00queue_full(entry->queue))
 169                 ieee80211_wake_queue(rt2x00dev->hw, priv_tx->control.queue);
 170 }
 171
 172 int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
 173                             struct data_queue *queue, struct sk_buff *skb,
 174                             struct ieee80211_tx_control *control)
 175 {
 176         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
 177         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
 178         struct queue_entry_priv_usb_tx *priv_tx = entry->priv_data;
 179         struct skb_frame_desc *skbdesc;
 180         u32 length;
 181
 182         if (rt2x00queue_full(queue))
 183                 return -EINVAL;
 184
 185         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
 186                 ERROR(rt2x00dev,
 187                       "Arrived at non-free entry in the non-full queue %d.\n"
 188                       "Please file bug report to %s.\n",
 189                       control->queue, DRV_PROJECT);
 190                 return -EINVAL;
 191         }
 192
 193         /*
 194          * Add the descriptor in front of the skb.
 195          */
 196         skb_push(skb, queue->desc_size);
 197         memset(skb->data, 0, queue->desc_size);
 198
 199         /*
 200          * Fill in skb descriptor
 201          */
 202         skbdesc = get_skb_frame_desc(skb);
 203         skbdesc->data = skb->data + queue->desc_size;
 204         skbdesc->data_len = skb->len - queue->desc_size;
 205         skbdesc->desc = skb->data;
 206         skbdesc->desc_len = queue->desc_size;
 207         skbdesc->entry = entry;
 208
 209         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
 210
 211         /*
 212          * USB devices cannot blindly pass the skb->len as the
 213          * length of the data to usb_fill_bulk_urb. Pass the skb
 214          * to the driver to determine what the length should be.
 215          */
 216         length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, skb);
 217
 218         /*
 219          * Initialize URB and send the frame to the device.
 220          */
 221         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 222         usb_fill_bulk_urb(priv_tx->urb, usb_dev, usb_sndbulkpipe(usb_dev, 1),
 223                           skb->data, length, rt2x00usb_interrupt_txdone, entry);
 224         usb_submit_urb(priv_tx->urb, GFP_ATOMIC);
 225
 226         rt2x00queue_index_inc(queue, Q_INDEX);
 227
 228         return 0;
 229 }
 230 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
 231
 232 /*
 233  * RX data handlers.
 234  */
 235 static struct sk_buff* rt2x00usb_alloc_rxskb(struct data_queue *queue)
 236 {
 237         struct sk_buff *skb;
 238         unsigned int frame_size;
 239
 240         /*
 241          * As alignment we use 2 and not NET_IP_ALIGN because we need
 242          * to be sure we have 2 bytes room in the head. (NET_IP_ALIGN
 243          * can be 0 on some hardware). We use these 2 bytes for frame
 244          * alignment later, we assume that the chance that
 245          * header_size % 4 == 2 is bigger then header_size % 2 == 0
 246          * and thus optimize alignment by reserving the 2 bytes in
 247          * advance.
 248          */
 249         frame_size = queue->data_size + queue->desc_size;
 250         skb = dev_alloc_skb(frame_size + 2);
 251         if (!skb)
 252                 return NULL;
 253
 254         skb_reserve(skb, 2);
 255         skb_put(skb, frame_size);
 256
 257         return skb;
 258 }
 259
 260 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 261 {
 262         struct queue_entry *entry = (struct queue_entry *)urb->context;
 263         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 264         struct sk_buff *skb;
 265         struct skb_frame_desc *skbdesc;
 266         struct rxdone_entry_desc rxdesc;
 267
 268         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 269             !test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 270                 return;
 271
 272         /*
 273          * Check if the received data is simply too small
 274          * to be actually valid, or if the urb is signaling
 275          * a problem.
 276          */
 277         if (urb->actual_length < entry->queue->desc_size || urb->status)
 278                 goto skip_entry;
 279
 280         /*
 281          * Fill in skb descriptor
 282          */
 283         skbdesc = get_skb_frame_desc(entry->skb);
 284         memset(skbdesc, 0, sizeof(*skbdesc));
 285         skbdesc->entry = entry;
 286
 287         memset(&rxdesc, 0, sizeof(rxdesc));
 288         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 289
 290         /*
 291          * Allocate a new sk buffer to replace the current one.
 292          * If allocation fails, we should drop the current frame
 293          * so we can recycle the existing sk buffer for the new frame.
 294          */
 295         skb = rt2x00usb_alloc_rxskb(entry->queue);
 296         if (!skb)
 297                 goto skip_entry;
 298
 299         /*
 300          * Send the frame to rt2x00lib for further processing.
 301          */
 302         rt2x00lib_rxdone(entry, &rxdesc);
 303
 304         /*
 305          * Replace current entry's skb with the newly allocated one,
 306          * and reinitialize the urb.
 307          */
 308         entry->skb = skb;
 309         urb->transfer_buffer = entry->skb->data;
 310         urb->transfer_buffer_length = entry->skb->len;
 311
 312 skip_entry:
 313         if (test_bit(DEVICE_ENABLED_RADIO, &entry->queue->rt2x00dev->flags)) {
 314                 __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 315                 usb_submit_urb(urb, GFP_ATOMIC);
 316         }
 317
 318         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 319 }
 320
 321 /*
 322  * Radio handlers
 323  */
 324 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 325 {
 326         struct queue_entry_priv_usb_rx *priv_rx;
 327         struct queue_entry_priv_usb_tx *priv_tx;
 328         struct queue_entry_priv_usb_bcn *priv_bcn;
 329         struct data_queue *queue;
 330         unsigned int i;
 331
 332         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
 333                                     REGISTER_TIMEOUT);
 334
 335         /*
 336          * Cancel all queues.
 337          */
 338         for (i = 0; i < rt2x00dev->rx->limit; i++) {
 339                 priv_rx = rt2x00dev->rx->entries[i].priv_data;
 340                 usb_kill_urb(priv_rx->urb);
 341         }
 342
 343         tx_queue_for_each(rt2x00dev, queue) {
 344                 for (i = 0; i < queue->limit; i++) {
 345                         priv_tx = queue->entries[i].priv_data;
 346                         usb_kill_urb(priv_tx->urb);
 347                 }
 348         }
 349
 350         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
 351                 priv_bcn = rt2x00dev->bcn->entries[i].priv_data;
 352                 usb_kill_urb(priv_bcn->urb);
 353
 354                 if (priv_bcn->guardian_urb)
 355                         usb_kill_urb(priv_bcn->guardian_urb);
 356         }
 357
 358         if (!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
 359                 return;
 360
 361         for (i = 0; i < rt2x00dev->bcn[1].limit; i++) {
 362                 priv_tx = rt2x00dev->bcn[1].entries[i].priv_data;
 363                 usb_kill_urb(priv_tx->urb);
 364         }
 365 }
 366 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 367
 368 /*
 369  * Device initialization handlers.
 370  */
 371 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
 372                             struct queue_entry *entry)
 373 {
 374         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
 375         struct queue_entry_priv_usb_rx *priv_rx = entry->priv_data;
 376
 377         usb_fill_bulk_urb(priv_rx->urb, usb_dev,
 378                           usb_rcvbulkpipe(usb_dev, 1),
 379                           entry->skb->data, entry->skb->len,
 380                           rt2x00usb_interrupt_rxdone, entry);
 381
 382         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 383         usb_submit_urb(priv_rx->urb, GFP_ATOMIC);
 384 }
 385 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
 386
 387 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
 388                             struct queue_entry *entry)
 389 {
 390         entry->flags = 0;
 391 }
 392 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
 393
 394 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 395                                struct data_queue *queue)
 396 {
 397         struct queue_entry_priv_usb_rx *priv_rx;
 398         struct queue_entry_priv_usb_tx *priv_tx;
 399         struct queue_entry_priv_usb_bcn *priv_bcn;
 400         struct urb *urb;
 401         unsigned int guardian =
 402             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
 403         unsigned int i;
 404
 405         /*
 406          * Allocate the URB's
 407          */
 408         for (i = 0; i < queue->limit; i++) {
 409                 urb = usb_alloc_urb(0, GFP_KERNEL);
 410                 if (!urb)
 411                         return -ENOMEM;
 412
 413                 if (queue->qid == QID_RX) {
 414                         priv_rx = queue->entries[i].priv_data;
 415                         priv_rx->urb = urb;
 416                 } else if (queue->qid == QID_MGMT && guardian) {
 417                         priv_bcn = queue->entries[i].priv_data;
 418                         priv_bcn->urb = urb;
 419
 420                         urb = usb_alloc_urb(0, GFP_KERNEL);
 421                         if (!urb)
 422                                 return -ENOMEM;
 423
 424                         priv_bcn->guardian_urb = urb;
 425                 } else {
 426                         priv_tx = queue->entries[i].priv_data;
 427                         priv_tx->urb = urb;
 428                 }
 429         }
 430
 431         return 0;
 432 }
 433
 434 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 435                                struct data_queue *queue)
 436 {
 437         struct queue_entry_priv_usb_rx *priv_rx;
 438         struct queue_entry_priv_usb_tx *priv_tx;
 439         struct queue_entry_priv_usb_bcn *priv_bcn;
 440         struct urb *urb;
 441         unsigned int guardian =
 442             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
 443         unsigned int i;
 444
 445         if (!queue->entries)
 446                 return;
 447
 448         for (i = 0; i < queue->limit; i++) {
 449                 if (queue->qid == QID_RX) {
 450                         priv_rx = queue->entries[i].priv_data;
 451                         urb = priv_rx->urb;
 452                 } else if (queue->qid == QID_MGMT && guardian) {
 453                         priv_bcn = queue->entries[i].priv_data;
 454
 455                         usb_kill_urb(priv_bcn->guardian_urb);
 456                         usb_free_urb(priv_bcn->guardian_urb);
 457
 458                         urb = priv_bcn->urb;
 459                 } else {
 460                         priv_tx = queue->entries[i].priv_data;
 461                         urb = priv_tx->urb;
 462                 }
 463
 464                 usb_kill_urb(urb);
 465                 usb_free_urb(urb);
 466                 if (queue->entries[i].skb)
 467                         kfree_skb(queue->entries[i].skb);
 468         }
 469 }
 470
 471 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 472 {
 473         struct data_queue *queue;
 474         struct sk_buff *skb;
 475         unsigned int entry_size;
 476         unsigned int i;
 477         int uninitialized_var(status);
 478
 479         /*
 480          * Allocate DMA
 481          */
 482         queue_for_each(rt2x00dev, queue) {
 483                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
 484                 if (status)
 485                         goto exit;
 486         }
 487
 488         /*
 489          * For the RX queue, skb's should be allocated.
 490          */
 491         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
 492         for (i = 0; i < rt2x00dev->rx->limit; i++) {
 493                 skb = rt2x00usb_alloc_rxskb(rt2x00dev->rx);
 494                 if (!skb)
 495                         goto exit;
 496
 497                 rt2x00dev->rx->entries[i].skb = skb;
 498         }
 499
 500         return 0;
 501
 502 exit:
 503         rt2x00usb_uninitialize(rt2x00dev);
 504
 505         return status;
 506 }
 507 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 508
 509 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 510 {
 511         struct data_queue *queue;
 512
 513         queue_for_each(rt2x00dev, queue)
 514                 rt2x00usb_free_urb(rt2x00dev, queue);
 515 }
 516 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 517
 518 /*
 519  * USB driver handlers.
 520  */
 521 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 522 {
 523         kfree(rt2x00dev->rf);
 524         rt2x00dev->rf = NULL;
 525
 526         kfree(rt2x00dev->eeprom);
 527         rt2x00dev->eeprom = NULL;
 528
 529         kfree(rt2x00dev->csr.cache);
 530         rt2x00dev->csr.cache = NULL;
 531 }
 532
 533 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 534 {
 535         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 536         if (!rt2x00dev->csr.cache)
 537                 goto exit;
 538
 539         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 540         if (!rt2x00dev->eeprom)
 541                 goto exit;
 542
 543         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 544         if (!rt2x00dev->rf)
 545                 goto exit;
 546
 547         return 0;
 548
 549 exit:
 550         ERROR_PROBE("Failed to allocate registers.\n");
 551
 552         rt2x00usb_free_reg(rt2x00dev);
 553
 554         return -ENOMEM;
 555 }
 556
 557 int rt2x00usb_probe(struct usb_interface *usb_intf,
 558                     const struct usb_device_id *id)
 559 {
 560         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 561         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 562         struct ieee80211_hw *hw;
 563         struct rt2x00_dev *rt2x00dev;
 564         int retval;
 565
 566         usb_dev = usb_get_dev(usb_dev);
 567
 568         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 569         if (!hw) {
 570                 ERROR_PROBE("Failed to allocate hardware.\n");
 571                 retval = -ENOMEM;
 572                 goto exit_put_device;
 573         }
 574
 575         usb_set_intfdata(usb_intf, hw);
 576
 577         rt2x00dev = hw->priv;
 578         rt2x00dev->dev = usb_intf;
 579         rt2x00dev->ops = ops;
 580         rt2x00dev->hw = hw;
 581         mutex_init(&rt2x00dev->usb_cache_mutex);
 582
 583         rt2x00dev->usb_maxpacket =
 584             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
 585         if (!rt2x00dev->usb_maxpacket)
 586                 rt2x00dev->usb_maxpacket = 1;
 587
 588         retval = rt2x00usb_alloc_reg(rt2x00dev);
 589         if (retval)
 590                 goto exit_free_device;
 591
 592         retval = rt2x00lib_probe_dev(rt2x00dev);
 593         if (retval)
 594                 goto exit_free_reg;
 595
 596         return 0;
 597
 598 exit_free_reg:
 599         rt2x00usb_free_reg(rt2x00dev);
 600
 601 exit_free_device:
 602         ieee80211_free_hw(hw);
 603
 604 exit_put_device:
 605         usb_put_dev(usb_dev);
 606
 607         usb_set_intfdata(usb_intf, NULL);
 608
 609         return retval;
 610 }
 611 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 612
 613 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 614 {
 615         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 616         struct rt2x00_dev *rt2x00dev = hw->priv;
 617
 618         /*
 619          * Free all allocated data.
 620          */
 621         rt2x00lib_remove_dev(rt2x00dev);
 622         rt2x00usb_free_reg(rt2x00dev);
 623         ieee80211_free_hw(hw);
 624
 625         /*
 626          * Free the USB device data.
 627          */
 628         usb_set_intfdata(usb_intf, NULL);
 629         usb_put_dev(interface_to_usbdev(usb_intf));
 630 }
 631 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 632
 633 #ifdef CONFIG_PM
 634 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 635 {
 636         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 637         struct rt2x00_dev *rt2x00dev = hw->priv;
 638         int retval;
 639
 640         retval = rt2x00lib_suspend(rt2x00dev, state);
 641         if (retval)
 642                 return retval;
 643
 644         rt2x00usb_free_reg(rt2x00dev);
 645
 646         /*
 647          * Decrease usbdev refcount.
 648          */
 649         usb_put_dev(interface_to_usbdev(usb_intf));
 650
 651         return 0;
 652 }
 653 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 654
 655 int rt2x00usb_resume(struct usb_interface *usb_intf)
 656 {
 657         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 658         struct rt2x00_dev *rt2x00dev = hw->priv;
 659         int retval;
 660
 661         usb_get_dev(interface_to_usbdev(usb_intf));
 662
 663         retval = rt2x00usb_alloc_reg(rt2x00dev);
 664         if (retval)
 665                 return retval;
 666
 667         retval = rt2x00lib_resume(rt2x00dev);
 668         if (retval)
 669                 goto exit_free_reg;
 670
 671         return 0;
 672
 673 exit_free_reg:
 674         rt2x00usb_free_reg(rt2x00dev);
 675
 676         return retval;
 677 }
 678 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 679 #endif /* CONFIG_PM */
 680
 681 /*
 682  * rt2x00usb module information.
 683  */
 684 MODULE_AUTHOR(DRV_PROJECT);
 685 MODULE_VERSION(DRV_VERSION);
 686 MODULE_DESCRIPTION("rt2x00 usb library");
 687 MODULE_LICENSE("GPL");