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 = 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         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         /*
 366          * Kill guardian urb (if required by driver).
 367          */
 368         if (!test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 369                 return;
 370
 371         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
 372                 priv_bcn = rt2x00dev->bcn->entries[i].priv_data;
 373                 usb_kill_urb(priv_bcn->urb);
 374
 375                 if (priv_bcn->guardian_urb)
 376                         usb_kill_urb(priv_bcn->guardian_urb);
 377         }
 378
 379         if (!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
 380                 return;
 381
 382         for (i = 0; i < rt2x00dev->bcn[1].limit; i++) {
 383                 priv_tx = rt2x00dev->bcn[1].entries[i].priv_data;
 384                 usb_kill_urb(priv_tx->urb);
 385         }
 386 }
 387 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 388
 389 /*
 390  * Device initialization handlers.
 391  */
 392 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
 393                             struct queue_entry *entry)
 394 {
 395         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
 396         struct queue_entry_priv_usb_rx *priv_rx = entry->priv_data;
 397
 398         usb_fill_bulk_urb(priv_rx->urb, usb_dev,
 399                           usb_rcvbulkpipe(usb_dev, 1),
 400                           entry->skb->data, entry->skb->len,
 401                           rt2x00usb_interrupt_rxdone, entry);
 402
 403         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 404         usb_submit_urb(priv_rx->urb, GFP_ATOMIC);
 405 }
 406 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
 407
 408 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
 409                             struct queue_entry *entry)
 410 {
 411         entry->flags = 0;
 412 }
 413 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
 414
 415 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 416                                struct data_queue *queue)
 417 {
 418         struct queue_entry_priv_usb_rx *priv_rx;
 419         struct queue_entry_priv_usb_tx *priv_tx;
 420         struct queue_entry_priv_usb_bcn *priv_bcn;
 421         struct urb *urb;
 422         unsigned int guardian =
 423             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
 424         unsigned int i;
 425
 426         /*
 427          * Allocate the URB's
 428          */
 429         for (i = 0; i < queue->limit; i++) {
 430                 urb = usb_alloc_urb(0, GFP_KERNEL);
 431                 if (!urb)
 432                         return -ENOMEM;
 433
 434                 if (queue->qid == QID_RX) {
 435                         priv_rx = queue->entries[i].priv_data;
 436                         priv_rx->urb = urb;
 437                 } else if (queue->qid == QID_MGMT && guardian) {
 438                         priv_bcn = queue->entries[i].priv_data;
 439                         priv_bcn->urb = urb;
 440
 441                         urb = usb_alloc_urb(0, GFP_KERNEL);
 442                         if (!urb)
 443                                 return -ENOMEM;
 444
 445                         priv_bcn->guardian_urb = urb;
 446                 } else {
 447                         priv_tx = queue->entries[i].priv_data;
 448                         priv_tx->urb = urb;
 449                 }
 450         }
 451
 452         return 0;
 453 }
 454
 455 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 456                                struct data_queue *queue)
 457 {
 458         struct queue_entry_priv_usb_rx *priv_rx;
 459         struct queue_entry_priv_usb_tx *priv_tx;
 460         struct queue_entry_priv_usb_bcn *priv_bcn;
 461         struct urb *urb;
 462         unsigned int guardian =
 463             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
 464         unsigned int i;
 465
 466         if (!queue->entries)
 467                 return;
 468
 469         for (i = 0; i < queue->limit; i++) {
 470                 if (queue->qid == QID_RX) {
 471                         priv_rx = queue->entries[i].priv_data;
 472                         urb = priv_rx->urb;
 473                 } else if (queue->qid == QID_MGMT && guardian) {
 474                         priv_bcn = queue->entries[i].priv_data;
 475
 476                         usb_kill_urb(priv_bcn->guardian_urb);
 477                         usb_free_urb(priv_bcn->guardian_urb);
 478
 479                         urb = priv_bcn->urb;
 480                 } else {
 481                         priv_tx = queue->entries[i].priv_data;
 482                         urb = priv_tx->urb;
 483                 }
 484
 485                 usb_kill_urb(urb);
 486                 usb_free_urb(urb);
 487                 if (queue->entries[i].skb)
 488                         kfree_skb(queue->entries[i].skb);
 489         }
 490 }
 491
 492 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 493 {
 494         struct data_queue *queue;
 495         struct sk_buff *skb;
 496         unsigned int entry_size;
 497         unsigned int i;
 498         int uninitialized_var(status);
 499
 500         /*
 501          * Allocate DMA
 502          */
 503         queue_for_each(rt2x00dev, queue) {
 504                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
 505                 if (status)
 506                         goto exit;
 507         }
 508
 509         /*
 510          * For the RX queue, skb's should be allocated.
 511          */
 512         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
 513         for (i = 0; i < rt2x00dev->rx->limit; i++) {
 514                 skb = rt2x00usb_alloc_rxskb(rt2x00dev->rx);
 515                 if (!skb)
 516                         goto exit;
 517
 518                 rt2x00dev->rx->entries[i].skb = skb;
 519         }
 520
 521         return 0;
 522
 523 exit:
 524         rt2x00usb_uninitialize(rt2x00dev);
 525
 526         return status;
 527 }
 528 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 529
 530 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 531 {
 532         struct data_queue *queue;
 533
 534         queue_for_each(rt2x00dev, queue)
 535                 rt2x00usb_free_urb(rt2x00dev, queue);
 536 }
 537 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 538
 539 /*
 540  * USB driver handlers.
 541  */
 542 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 543 {
 544         kfree(rt2x00dev->rf);
 545         rt2x00dev->rf = NULL;
 546
 547         kfree(rt2x00dev->eeprom);
 548         rt2x00dev->eeprom = NULL;
 549
 550         kfree(rt2x00dev->csr.cache);
 551         rt2x00dev->csr.cache = NULL;
 552 }
 553
 554 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 555 {
 556         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 557         if (!rt2x00dev->csr.cache)
 558                 goto exit;
 559
 560         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 561         if (!rt2x00dev->eeprom)
 562                 goto exit;
 563
 564         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 565         if (!rt2x00dev->rf)
 566                 goto exit;
 567
 568         return 0;
 569
 570 exit:
 571         ERROR_PROBE("Failed to allocate registers.\n");
 572
 573         rt2x00usb_free_reg(rt2x00dev);
 574
 575         return -ENOMEM;
 576 }
 577
 578 int rt2x00usb_probe(struct usb_interface *usb_intf,
 579                     const struct usb_device_id *id)
 580 {
 581         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 582         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 583         struct ieee80211_hw *hw;
 584         struct rt2x00_dev *rt2x00dev;
 585         int retval;
 586
 587         usb_dev = usb_get_dev(usb_dev);
 588
 589         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 590         if (!hw) {
 591                 ERROR_PROBE("Failed to allocate hardware.\n");
 592                 retval = -ENOMEM;
 593                 goto exit_put_device;
 594         }
 595
 596         usb_set_intfdata(usb_intf, hw);
 597
 598         rt2x00dev = hw->priv;
 599         rt2x00dev->dev = usb_intf;
 600         rt2x00dev->ops = ops;
 601         rt2x00dev->hw = hw;
 602         mutex_init(&rt2x00dev->usb_cache_mutex);
 603
 604         rt2x00dev->usb_maxpacket =
 605             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
 606         if (!rt2x00dev->usb_maxpacket)
 607                 rt2x00dev->usb_maxpacket = 1;
 608
 609         retval = rt2x00usb_alloc_reg(rt2x00dev);
 610         if (retval)
 611                 goto exit_free_device;
 612
 613         retval = rt2x00lib_probe_dev(rt2x00dev);
 614         if (retval)
 615                 goto exit_free_reg;
 616
 617         return 0;
 618
 619 exit_free_reg:
 620         rt2x00usb_free_reg(rt2x00dev);
 621
 622 exit_free_device:
 623         ieee80211_free_hw(hw);
 624
 625 exit_put_device:
 626         usb_put_dev(usb_dev);
 627
 628         usb_set_intfdata(usb_intf, NULL);
 629
 630         return retval;
 631 }
 632 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 633
 634 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 635 {
 636         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 637         struct rt2x00_dev *rt2x00dev = hw->priv;
 638
 639         /*
 640          * Free all allocated data.
 641          */
 642         rt2x00lib_remove_dev(rt2x00dev);
 643         rt2x00usb_free_reg(rt2x00dev);
 644         ieee80211_free_hw(hw);
 645
 646         /*
 647          * Free the USB device data.
 648          */
 649         usb_set_intfdata(usb_intf, NULL);
 650         usb_put_dev(interface_to_usbdev(usb_intf));
 651 }
 652 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 653
 654 #ifdef CONFIG_PM
 655 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 656 {
 657         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 658         struct rt2x00_dev *rt2x00dev = hw->priv;
 659         int retval;
 660
 661         retval = rt2x00lib_suspend(rt2x00dev, state);
 662         if (retval)
 663                 return retval;
 664
 665         rt2x00usb_free_reg(rt2x00dev);
 666
 667         /*
 668          * Decrease usbdev refcount.
 669          */
 670         usb_put_dev(interface_to_usbdev(usb_intf));
 671
 672         return 0;
 673 }
 674 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 675
 676 int rt2x00usb_resume(struct usb_interface *usb_intf)
 677 {
 678         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 679         struct rt2x00_dev *rt2x00dev = hw->priv;
 680         int retval;
 681
 682         usb_get_dev(interface_to_usbdev(usb_intf));
 683
 684         retval = rt2x00usb_alloc_reg(rt2x00dev);
 685         if (retval)
 686                 return retval;
 687
 688         retval = rt2x00lib_resume(rt2x00dev);
 689         if (retval)
 690                 goto exit_free_reg;
 691
 692         return 0;
 693
 694 exit_free_reg:
 695         rt2x00usb_free_reg(rt2x00dev);
 696
 697         return retval;
 698 }
 699 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 700 #endif /* CONFIG_PM */
 701
 702 /*
 703  * rt2x00usb module information.
 704  */
 705 MODULE_AUTHOR(DRV_PROJECT);
 706 MODULE_VERSION(DRV_VERSION);
 707 MODULE_DESCRIPTION("rt2x00 usb library");
 708 MODULE_LICENSE("GPL");