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