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                       entry->queue->qid, 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         memcpy(&priv_tx->control, control, sizeof(priv_tx->control));
 210         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
 211
 212         /*
 213          * USB devices cannot blindly pass the skb->len as the
 214          * length of the data to usb_fill_bulk_urb. Pass the skb
 215          * to the driver to determine what the length should be.
 216          */
 217         length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, skb);
 218
 219         /*
 220          * Initialize URB and send the frame to the device.
 221          */
 222         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 223         usb_fill_bulk_urb(priv_tx->urb, usb_dev, usb_sndbulkpipe(usb_dev, 1),
 224                           skb->data, length, rt2x00usb_interrupt_txdone, entry);
 225         usb_submit_urb(priv_tx->urb, GFP_ATOMIC);
 226
 227         rt2x00queue_index_inc(queue, Q_INDEX);
 228
 229         return 0;
 230 }
 231 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
 232
 233 /*
 234  * RX data handlers.
 235  */
 236 static struct sk_buff* rt2x00usb_alloc_rxskb(struct data_queue *queue)
 237 {
 238         struct sk_buff *skb;
 239         unsigned int frame_size;
 240
 241         /*
 242          * As alignment we use 2 and not NET_IP_ALIGN because we need
 243          * to be sure we have 2 bytes room in the head. (NET_IP_ALIGN
 244          * can be 0 on some hardware). We use these 2 bytes for frame
 245          * alignment later, we assume that the chance that
 246          * header_size % 4 == 2 is bigger then header_size % 2 == 0
 247          * and thus optimize alignment by reserving the 2 bytes in
 248          * advance.
 249          */
 250         frame_size = queue->data_size + queue->desc_size;
 251         skb = dev_alloc_skb(queue->desc_size + frame_size + 2);
 252         if (!skb)
 253                 return NULL;
 254
 255         skb_reserve(skb, queue->desc_size + 2);
 256         skb_put(skb, frame_size);
 257
 258         return skb;
 259 }
 260
 261 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 262 {
 263         struct queue_entry *entry = (struct queue_entry *)urb->context;
 264         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 265         struct sk_buff *skb;
 266         struct skb_frame_desc *skbdesc;
 267         struct rxdone_entry_desc rxdesc;
 268         int header_size;
 269
 270         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 271             !test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 272                 return;
 273
 274         /*
 275          * Check if the received data is simply too small
 276          * to be actually valid, or if the urb is signaling
 277          * a problem.
 278          */
 279         if (urb->actual_length < entry->queue->desc_size || urb->status)
 280                 goto skip_entry;
 281
 282         /*
 283          * Fill in skb descriptor
 284          */
 285         skbdesc = get_skb_frame_desc(entry->skb);
 286         memset(skbdesc, 0, sizeof(*skbdesc));
 287         skbdesc->entry = entry;
 288
 289         memset(&rxdesc, 0, sizeof(rxdesc));
 290         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 291
 292         /*
 293          * The data behind the ieee80211 header must be
 294          * aligned on a 4 byte boundary.
 295          */
 296         header_size = ieee80211_get_hdrlen_from_skb(entry->skb);
 297         if (header_size % 4 == 0) {
 298                 skb_push(entry->skb, 2);
 299                 memmove(entry->skb->data, entry->skb->data + 2,
 300                         entry->skb->len - 2);
 301                 skbdesc->data = entry->skb->data;
 302                 skb_trim(entry->skb,entry->skb->len - 2);
 303         }
 304
 305         /*
 306          * Allocate a new sk buffer to replace the current one.
 307          * If allocation fails, we should drop the current frame
 308          * so we can recycle the existing sk buffer for the new frame.
 309          */
 310         skb = rt2x00usb_alloc_rxskb(entry->queue);
 311         if (!skb)
 312                 goto skip_entry;
 313
 314         /*
 315          * Send the frame to rt2x00lib for further processing.
 316          */
 317         rt2x00lib_rxdone(entry, &rxdesc);
 318
 319         /*
 320          * Replace current entry's skb with the newly allocated one,
 321          * and reinitialize the urb.
 322          */
 323         entry->skb = skb;
 324         urb->transfer_buffer = entry->skb->data;
 325         urb->transfer_buffer_length = entry->skb->len;
 326
 327 skip_entry:
 328         if (test_bit(DEVICE_ENABLED_RADIO, &entry->queue->rt2x00dev->flags)) {
 329                 __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 330                 usb_submit_urb(urb, GFP_ATOMIC);
 331         }
 332
 333         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 334 }
 335
 336 /*
 337  * Radio handlers
 338  */
 339 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 340 {
 341         struct queue_entry_priv_usb_rx *priv_rx;
 342         struct queue_entry_priv_usb_tx *priv_tx;
 343         struct queue_entry_priv_usb_bcn *priv_bcn;
 344         struct data_queue *queue;
 345         unsigned int i;
 346
 347         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
 348                                     REGISTER_TIMEOUT);
 349
 350         /*
 351          * Cancel all queues.
 352          */
 353         for (i = 0; i < rt2x00dev->rx->limit; i++) {
 354                 priv_rx = rt2x00dev->rx->entries[i].priv_data;
 355                 usb_kill_urb(priv_rx->urb);
 356         }
 357
 358         tx_queue_for_each(rt2x00dev, queue) {
 359                 for (i = 0; i < queue->limit; i++) {
 360                         priv_tx = queue->entries[i].priv_data;
 361                         usb_kill_urb(priv_tx->urb);
 362                 }
 363         }
 364
 365         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
 366                 priv_bcn = rt2x00dev->bcn->entries[i].priv_data;
 367                 usb_kill_urb(priv_bcn->urb);
 368
 369                 if (priv_bcn->guardian_urb)
 370                         usb_kill_urb(priv_bcn->guardian_urb);
 371         }
 372
 373         if (!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
 374                 return;
 375
 376         for (i = 0; i < rt2x00dev->bcn[1].limit; i++) {
 377                 priv_tx = rt2x00dev->bcn[1].entries[i].priv_data;
 378                 usb_kill_urb(priv_tx->urb);
 379         }
 380 }
 381 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 382
 383 /*
 384  * Device initialization handlers.
 385  */
 386 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
 387                             struct queue_entry *entry)
 388 {
 389         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
 390         struct queue_entry_priv_usb_rx *priv_rx = entry->priv_data;
 391
 392         usb_fill_bulk_urb(priv_rx->urb, usb_dev,
 393                           usb_rcvbulkpipe(usb_dev, 1),
 394                           entry->skb->data, entry->skb->len,
 395                           rt2x00usb_interrupt_rxdone, entry);
 396
 397         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 398         usb_submit_urb(priv_rx->urb, GFP_ATOMIC);
 399 }
 400 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
 401
 402 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
 403                             struct queue_entry *entry)
 404 {
 405         entry->flags = 0;
 406 }
 407 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
 408
 409 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 410                                struct data_queue *queue)
 411 {
 412         struct queue_entry_priv_usb_rx *priv_rx;
 413         struct queue_entry_priv_usb_tx *priv_tx;
 414         struct queue_entry_priv_usb_bcn *priv_bcn;
 415         struct urb *urb;
 416         unsigned int guardian =
 417             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
 418         unsigned int i;
 419
 420         /*
 421          * Allocate the URB's
 422          */
 423         for (i = 0; i < queue->limit; i++) {
 424                 urb = usb_alloc_urb(0, GFP_KERNEL);
 425                 if (!urb)
 426                         return -ENOMEM;
 427
 428                 if (queue->qid == QID_RX) {
 429                         priv_rx = queue->entries[i].priv_data;
 430                         priv_rx->urb = urb;
 431                 } else if (queue->qid == QID_MGMT && guardian) {
 432                         priv_bcn = queue->entries[i].priv_data;
 433                         priv_bcn->urb = urb;
 434
 435                         urb = usb_alloc_urb(0, GFP_KERNEL);
 436                         if (!urb)
 437                                 return -ENOMEM;
 438
 439                         priv_bcn->guardian_urb = urb;
 440                 } else {
 441                         priv_tx = queue->entries[i].priv_data;
 442                         priv_tx->urb = urb;
 443                 }
 444         }
 445
 446         return 0;
 447 }
 448
 449 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 450                                struct data_queue *queue)
 451 {
 452         struct queue_entry_priv_usb_rx *priv_rx;
 453         struct queue_entry_priv_usb_tx *priv_tx;
 454         struct queue_entry_priv_usb_bcn *priv_bcn;
 455         struct urb *urb;
 456         unsigned int guardian =
 457             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
 458         unsigned int i;
 459
 460         if (!queue->entries)
 461                 return;
 462
 463         for (i = 0; i < queue->limit; i++) {
 464                 if (queue->qid == QID_RX) {
 465                         priv_rx = queue->entries[i].priv_data;
 466                         urb = priv_rx->urb;
 467                 } else if (queue->qid == QID_MGMT && guardian) {
 468                         priv_bcn = queue->entries[i].priv_data;
 469
 470                         usb_kill_urb(priv_bcn->guardian_urb);
 471                         usb_free_urb(priv_bcn->guardian_urb);
 472
 473                         urb = priv_bcn->urb;
 474                 } else {
 475                         priv_tx = queue->entries[i].priv_data;
 476                         urb = priv_tx->urb;
 477                 }
 478
 479                 usb_kill_urb(urb);
 480                 usb_free_urb(urb);
 481                 if (queue->entries[i].skb)
 482                         kfree_skb(queue->entries[i].skb);
 483         }
 484 }
 485
 486 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 487 {
 488         struct data_queue *queue;
 489         struct sk_buff *skb;
 490         unsigned int entry_size;
 491         unsigned int i;
 492         int uninitialized_var(status);
 493
 494         /*
 495          * Allocate DMA
 496          */
 497         queue_for_each(rt2x00dev, queue) {
 498                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
 499                 if (status)
 500                         goto exit;
 501         }
 502
 503         /*
 504          * For the RX queue, skb's should be allocated.
 505          */
 506         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
 507         for (i = 0; i < rt2x00dev->rx->limit; i++) {
 508                 skb = rt2x00usb_alloc_rxskb(rt2x00dev->rx);
 509                 if (!skb)
 510                         goto exit;
 511
 512                 rt2x00dev->rx->entries[i].skb = skb;
 513         }
 514
 515         return 0;
 516
 517 exit:
 518         rt2x00usb_uninitialize(rt2x00dev);
 519
 520         return status;
 521 }
 522 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 523
 524 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 525 {
 526         struct data_queue *queue;
 527
 528         queue_for_each(rt2x00dev, queue)
 529                 rt2x00usb_free_urb(rt2x00dev, queue);
 530 }
 531 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 532
 533 /*
 534  * USB driver handlers.
 535  */
 536 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 537 {
 538         kfree(rt2x00dev->rf);
 539         rt2x00dev->rf = NULL;
 540
 541         kfree(rt2x00dev->eeprom);
 542         rt2x00dev->eeprom = NULL;
 543
 544         kfree(rt2x00dev->csr.cache);
 545         rt2x00dev->csr.cache = NULL;
 546 }
 547
 548 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 549 {
 550         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 551         if (!rt2x00dev->csr.cache)
 552                 goto exit;
 553
 554         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 555         if (!rt2x00dev->eeprom)
 556                 goto exit;
 557
 558         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 559         if (!rt2x00dev->rf)
 560                 goto exit;
 561
 562         return 0;
 563
 564 exit:
 565         ERROR_PROBE("Failed to allocate registers.\n");
 566
 567         rt2x00usb_free_reg(rt2x00dev);
 568
 569         return -ENOMEM;
 570 }
 571
 572 int rt2x00usb_probe(struct usb_interface *usb_intf,
 573                     const struct usb_device_id *id)
 574 {
 575         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 576         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 577         struct ieee80211_hw *hw;
 578         struct rt2x00_dev *rt2x00dev;
 579         int retval;
 580
 581         usb_dev = usb_get_dev(usb_dev);
 582
 583         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 584         if (!hw) {
 585                 ERROR_PROBE("Failed to allocate hardware.\n");
 586                 retval = -ENOMEM;
 587                 goto exit_put_device;
 588         }
 589
 590         usb_set_intfdata(usb_intf, hw);
 591
 592         rt2x00dev = hw->priv;
 593         rt2x00dev->dev = usb_intf;
 594         rt2x00dev->ops = ops;
 595         rt2x00dev->hw = hw;
 596         mutex_init(&rt2x00dev->usb_cache_mutex);
 597
 598         rt2x00dev->usb_maxpacket =
 599             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
 600         if (!rt2x00dev->usb_maxpacket)
 601                 rt2x00dev->usb_maxpacket = 1;
 602
 603         retval = rt2x00usb_alloc_reg(rt2x00dev);
 604         if (retval)
 605                 goto exit_free_device;
 606
 607         retval = rt2x00lib_probe_dev(rt2x00dev);
 608         if (retval)
 609                 goto exit_free_reg;
 610
 611         return 0;
 612
 613 exit_free_reg:
 614         rt2x00usb_free_reg(rt2x00dev);
 615
 616 exit_free_device:
 617         ieee80211_free_hw(hw);
 618
 619 exit_put_device:
 620         usb_put_dev(usb_dev);
 621
 622         usb_set_intfdata(usb_intf, NULL);
 623
 624         return retval;
 625 }
 626 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 627
 628 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 629 {
 630         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 631         struct rt2x00_dev *rt2x00dev = hw->priv;
 632
 633         /*
 634          * Free all allocated data.
 635          */
 636         rt2x00lib_remove_dev(rt2x00dev);
 637         rt2x00usb_free_reg(rt2x00dev);
 638         ieee80211_free_hw(hw);
 639
 640         /*
 641          * Free the USB device data.
 642          */
 643         usb_set_intfdata(usb_intf, NULL);
 644         usb_put_dev(interface_to_usbdev(usb_intf));
 645 }
 646 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 647
 648 #ifdef CONFIG_PM
 649 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 650 {
 651         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 652         struct rt2x00_dev *rt2x00dev = hw->priv;
 653         int retval;
 654
 655         retval = rt2x00lib_suspend(rt2x00dev, state);
 656         if (retval)
 657                 return retval;
 658
 659         rt2x00usb_free_reg(rt2x00dev);
 660
 661         /*
 662          * Decrease usbdev refcount.
 663          */
 664         usb_put_dev(interface_to_usbdev(usb_intf));
 665
 666         return 0;
 667 }
 668 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 669
 670 int rt2x00usb_resume(struct usb_interface *usb_intf)
 671 {
 672         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 673         struct rt2x00_dev *rt2x00dev = hw->priv;
 674         int retval;
 675
 676         usb_get_dev(interface_to_usbdev(usb_intf));
 677
 678         retval = rt2x00usb_alloc_reg(rt2x00dev);
 679         if (retval)
 680                 return retval;
 681
 682         retval = rt2x00lib_resume(rt2x00dev);
 683         if (retval)
 684                 goto exit_free_reg;
 685
 686         return 0;
 687
 688 exit_free_reg:
 689         rt2x00usb_free_reg(rt2x00dev);
 690
 691         return retval;
 692 }
 693 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 694 #endif /* CONFIG_PM */
 695
 696 /*
 697  * rt2x00usb module information.
 698  */
 699 MODULE_AUTHOR(DRV_PROJECT);
 700 MODULE_VERSION(DRV_VERSION);
 701 MODULE_DESCRIPTION("rt2x00 usb library");
 702 MODULE_LICENSE("GPL");