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 txdone_entry_desc txdesc;
 133         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 134
 135         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 136             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 137                 return;
 138
 139         /*
 140          * Remove the descriptor data from the buffer.
 141          */
 142         skb_pull(entry->skb, entry->queue->desc_size);
 143
 144         /*
 145          * Obtain the status about this packet.
 146          * Note that when the status is 0 it does not mean the
 147          * frame was send out correctly. It only means the frame
 148          * was succesfully pushed to the hardware, we have no
 149          * way to determine the transmission status right now.
 150          * (Only indirectly by looking at the failed TX counters
 151          * in the register).
 152          */
 153         if (!urb->status)
 154                 __set_bit(TXDONE_UNKNOWN, &txdesc.flags);
 155         else
 156                 __set_bit(TXDONE_FAILURE, &txdesc.flags);
 157         txdesc.retry = 0;
 158
 159         rt2x00lib_txdone(entry, &txdesc);
 160
 161         /*
 162          * Make this entry available for reuse.
 163          */
 164         entry->flags = 0;
 165         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 166
 167         /*
 168          * If the data queue was below the threshold before the txdone
 169          * handler we must make sure the packet queue in the mac80211 stack
 170          * is reenabled when the txdone handler has finished.
 171          */
 172         if (!rt2x00queue_threshold(entry->queue))
 173                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 174 }
 175
 176 int rt2x00usb_write_tx_data(struct queue_entry *entry)
 177 {
 178         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 179         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
 180         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 181         struct skb_frame_desc *skbdesc;
 182         u32 length;
 183
 184         /*
 185          * Add the descriptor in front of the skb.
 186          */
 187         skb_push(entry->skb, entry->queue->desc_size);
 188         memset(entry->skb->data, 0, entry->queue->desc_size);
 189
 190         /*
 191          * Fill in skb descriptor
 192          */
 193         skbdesc = get_skb_frame_desc(entry->skb);
 194         memset(skbdesc, 0, sizeof(*skbdesc));
 195         skbdesc->desc = entry->skb->data;
 196         skbdesc->desc_len = entry->queue->desc_size;
 197         skbdesc->entry = entry;
 198
 199         /*
 200          * USB devices cannot blindly pass the skb->len as the
 201          * length of the data to usb_fill_bulk_urb. Pass the skb
 202          * to the driver to determine what the length should be.
 203          */
 204         length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, entry->skb);
 205
 206         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 207                           usb_sndbulkpipe(usb_dev, 1),
 208                           entry->skb->data, length,
 209                           rt2x00usb_interrupt_txdone, entry);
 210
 211         return 0;
 212 }
 213 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
 214
 215 static inline void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
 216 {
 217         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 218
 219         if (__test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags))
 220                 usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 221 }
 222
 223 void rt2x00usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
 224                              const enum data_queue_qid qid)
 225 {
 226         struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, qid);
 227         unsigned long irqflags;
 228         unsigned int index;
 229         unsigned int index_done;
 230         unsigned int i;
 231
 232         /*
 233          * Only protect the range we are going to loop over,
 234          * if during our loop a extra entry is set to pending
 235          * it should not be kicked during this run, since it
 236          * is part of another TX operation.
 237          */
 238         spin_lock_irqsave(&queue->lock, irqflags);
 239         index = queue->index[Q_INDEX];
 240         index_done = queue->index[Q_INDEX_DONE];
 241         spin_unlock_irqrestore(&queue->lock, irqflags);
 242
 243         /*
 244          * Start from the TX done pointer, this guarentees that we will
 245          * send out all frames in the correct order.
 246          */
 247         if (index_done < index) {
 248                 for (i = index_done; i < index; i++)
 249                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 250         } else {
 251                 for (i = index_done; i < queue->limit; i++)
 252                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 253
 254                 for (i = 0; i < index; i++)
 255                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 256         }
 257 }
 258 EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue);
 259
 260 /*
 261  * RX data handlers.
 262  */
 263 static struct sk_buff* rt2x00usb_alloc_rxskb(struct data_queue *queue)
 264 {
 265         struct sk_buff *skb;
 266         unsigned int frame_size;
 267         unsigned int reserved_size;
 268
 269         /*
 270          * The frame size includes descriptor size, because the
 271          * hardware directly receive the frame into the skbuffer.
 272          */
 273         frame_size = queue->data_size + queue->desc_size;
 274
 275         /*
 276          * For the allocation we should keep a few things in mind:
 277          * 1) 4byte alignment of 802.11 payload
 278          *
 279          * For (1) we need at most 4 bytes to guarentee the correct
 280          * alignment. We are going to optimize the fact that the chance
 281          * that the 802.11 header_size % 4 == 2 is much bigger then
 282          * anything else. However since we need to move the frame up
 283          * to 3 bytes to the front, which means we need to preallocate
 284          * 6 bytes.
 285          */
 286         reserved_size = 6;
 287
 288         /*
 289          * Allocate skbuffer.
 290          */
 291         skb = dev_alloc_skb(frame_size + reserved_size);
 292         if (!skb)
 293                 return NULL;
 294
 295         skb_reserve(skb, reserved_size);
 296         skb_put(skb, frame_size);
 297
 298         return skb;
 299 }
 300
 301 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 302 {
 303         struct queue_entry *entry = (struct queue_entry *)urb->context;
 304         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 305         struct sk_buff *skb;
 306         struct skb_frame_desc *skbdesc;
 307         struct rxdone_entry_desc rxdesc;
 308         unsigned int header_size;
 309         unsigned int align;
 310
 311         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 312             !test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 313                 return;
 314
 315         /*
 316          * Check if the received data is simply too small
 317          * to be actually valid, or if the urb is signaling
 318          * a problem.
 319          */
 320         if (urb->actual_length < entry->queue->desc_size || urb->status)
 321                 goto skip_entry;
 322
 323         /*
 324          * Fill in skb descriptor
 325          */
 326         skbdesc = get_skb_frame_desc(entry->skb);
 327         memset(skbdesc, 0, sizeof(*skbdesc));
 328         skbdesc->entry = entry;
 329
 330         memset(&rxdesc, 0, sizeof(rxdesc));
 331         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 332
 333         header_size = ieee80211_get_hdrlen_from_skb(entry->skb);
 334
 335         /*
 336          * The data behind the ieee80211 header must be
 337          * aligned on a 4 byte boundary. We already reserved
 338          * 2 bytes for header_size % 4 == 2 optimization.
 339          * To determine the number of bytes which the data
 340          * should be moved to the left, we must add these
 341          * 2 bytes to the header_size.
 342          */
 343         align = (header_size + 2) % 4;
 344
 345         if (align) {
 346                 skb_push(entry->skb, align);
 347                 /* Move entire frame in 1 command */
 348                 memmove(entry->skb->data, entry->skb->data + align,
 349                         rxdesc.size);
 350         }
 351
 352         /* Update data pointers, trim buffer to correct size */
 353         skb_trim(entry->skb, rxdesc.size);
 354
 355         /*
 356          * Allocate a new sk buffer to replace the current one.
 357          * If allocation fails, we should drop the current frame
 358          * so we can recycle the existing sk buffer for the new frame.
 359          */
 360         skb = rt2x00usb_alloc_rxskb(entry->queue);
 361         if (!skb)
 362                 goto skip_entry;
 363
 364         /*
 365          * Send the frame to rt2x00lib for further processing.
 366          */
 367         rt2x00lib_rxdone(entry, &rxdesc);
 368
 369         /*
 370          * Replace current entry's skb with the newly allocated one,
 371          * and reinitialize the urb.
 372          */
 373         entry->skb = skb;
 374         urb->transfer_buffer = entry->skb->data;
 375         urb->transfer_buffer_length = entry->skb->len;
 376
 377 skip_entry:
 378         if (test_bit(DEVICE_ENABLED_RADIO, &entry->queue->rt2x00dev->flags)) {
 379                 __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 380                 usb_submit_urb(urb, GFP_ATOMIC);
 381         }
 382
 383         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 384 }
 385
 386 /*
 387  * Radio handlers
 388  */
 389 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 390 {
 391         struct queue_entry_priv_usb *entry_priv;
 392         struct queue_entry_priv_usb_bcn *bcn_priv;
 393         unsigned int i;
 394
 395         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 396                                     REGISTER_TIMEOUT);
 397
 398         /*
 399          * Cancel all queues.
 400          */
 401         for (i = 0; i < rt2x00dev->rx->limit; i++) {
 402                 entry_priv = rt2x00dev->rx->entries[i].priv_data;
 403                 usb_kill_urb(entry_priv->urb);
 404         }
 405
 406         /*
 407          * Kill guardian urb.
 408          */
 409         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
 410                 bcn_priv = rt2x00dev->bcn->entries[i].priv_data;
 411                 if (bcn_priv->guardian_urb)
 412                         usb_kill_urb(bcn_priv->guardian_urb);
 413         }
 414 }
 415 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 416
 417 /*
 418  * Device initialization handlers.
 419  */
 420 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
 421                             struct queue_entry *entry)
 422 {
 423         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
 424         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 425
 426         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 427                           usb_rcvbulkpipe(usb_dev, 1),
 428                           entry->skb->data, entry->skb->len,
 429                           rt2x00usb_interrupt_rxdone, entry);
 430
 431         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 432         usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 433 }
 434 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
 435
 436 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
 437                             struct queue_entry *entry)
 438 {
 439         entry->flags = 0;
 440 }
 441 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
 442
 443 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 444                                struct data_queue *queue)
 445 {
 446         struct queue_entry_priv_usb *entry_priv;
 447         struct queue_entry_priv_usb_bcn *bcn_priv;
 448         unsigned int i;
 449
 450         for (i = 0; i < queue->limit; i++) {
 451                 entry_priv = queue->entries[i].priv_data;
 452                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 453                 if (!entry_priv->urb)
 454                         return -ENOMEM;
 455         }
 456
 457         /*
 458          * If this is not the beacon queue or
 459          * no guardian byte was required for the beacon,
 460          * then we are done.
 461          */
 462         if (rt2x00dev->bcn != queue ||
 463             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 464                 return 0;
 465
 466         for (i = 0; i < queue->limit; i++) {
 467                 bcn_priv = queue->entries[i].priv_data;
 468                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 469                 if (!bcn_priv->guardian_urb)
 470                         return -ENOMEM;
 471         }
 472
 473         return 0;
 474 }
 475
 476 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 477                                struct data_queue *queue)
 478 {
 479         struct queue_entry_priv_usb *entry_priv;
 480         struct queue_entry_priv_usb_bcn *bcn_priv;
 481         unsigned int i;
 482
 483         if (!queue->entries)
 484                 return;
 485
 486         for (i = 0; i < queue->limit; i++) {
 487                 entry_priv = queue->entries[i].priv_data;
 488                 usb_kill_urb(entry_priv->urb);
 489                 usb_free_urb(entry_priv->urb);
 490                 if (queue->entries[i].skb)
 491                         kfree_skb(queue->entries[i].skb);
 492         }
 493
 494         /*
 495          * If this is not the beacon queue or
 496          * no guardian byte was required for the beacon,
 497          * then we are done.
 498          */
 499         if (rt2x00dev->bcn != queue ||
 500             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 501                 return;
 502
 503         for (i = 0; i < queue->limit; i++) {
 504                 bcn_priv = queue->entries[i].priv_data;
 505                 usb_kill_urb(bcn_priv->guardian_urb);
 506                 usb_free_urb(bcn_priv->guardian_urb);
 507         }
 508 }
 509
 510 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 511 {
 512         struct data_queue *queue;
 513         struct sk_buff *skb;
 514         unsigned int entry_size;
 515         unsigned int i;
 516         int uninitialized_var(status);
 517
 518         /*
 519          * Allocate DMA
 520          */
 521         queue_for_each(rt2x00dev, queue) {
 522                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
 523                 if (status)
 524                         goto exit;
 525         }
 526
 527         /*
 528          * For the RX queue, skb's should be allocated.
 529          */
 530         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
 531         for (i = 0; i < rt2x00dev->rx->limit; i++) {
 532                 skb = rt2x00usb_alloc_rxskb(rt2x00dev->rx);
 533                 if (!skb)
 534                         goto exit;
 535
 536                 rt2x00dev->rx->entries[i].skb = skb;
 537         }
 538
 539         return 0;
 540
 541 exit:
 542         rt2x00usb_uninitialize(rt2x00dev);
 543
 544         return status;
 545 }
 546 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 547
 548 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 549 {
 550         struct data_queue *queue;
 551
 552         queue_for_each(rt2x00dev, queue)
 553                 rt2x00usb_free_urb(rt2x00dev, queue);
 554 }
 555 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 556
 557 /*
 558  * USB driver handlers.
 559  */
 560 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 561 {
 562         kfree(rt2x00dev->rf);
 563         rt2x00dev->rf = NULL;
 564
 565         kfree(rt2x00dev->eeprom);
 566         rt2x00dev->eeprom = NULL;
 567
 568         kfree(rt2x00dev->csr.cache);
 569         rt2x00dev->csr.cache = NULL;
 570 }
 571
 572 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 573 {
 574         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 575         if (!rt2x00dev->csr.cache)
 576                 goto exit;
 577
 578         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 579         if (!rt2x00dev->eeprom)
 580                 goto exit;
 581
 582         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 583         if (!rt2x00dev->rf)
 584                 goto exit;
 585
 586         return 0;
 587
 588 exit:
 589         ERROR_PROBE("Failed to allocate registers.\n");
 590
 591         rt2x00usb_free_reg(rt2x00dev);
 592
 593         return -ENOMEM;
 594 }
 595
 596 int rt2x00usb_probe(struct usb_interface *usb_intf,
 597                     const struct usb_device_id *id)
 598 {
 599         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 600         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 601         struct ieee80211_hw *hw;
 602         struct rt2x00_dev *rt2x00dev;
 603         int retval;
 604
 605         usb_dev = usb_get_dev(usb_dev);
 606
 607         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 608         if (!hw) {
 609                 ERROR_PROBE("Failed to allocate hardware.\n");
 610                 retval = -ENOMEM;
 611                 goto exit_put_device;
 612         }
 613
 614         usb_set_intfdata(usb_intf, hw);
 615
 616         rt2x00dev = hw->priv;
 617         rt2x00dev->dev = usb_intf;
 618         rt2x00dev->ops = ops;
 619         rt2x00dev->hw = hw;
 620         mutex_init(&rt2x00dev->usb_cache_mutex);
 621
 622         rt2x00dev->usb_maxpacket =
 623             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
 624         if (!rt2x00dev->usb_maxpacket)
 625                 rt2x00dev->usb_maxpacket = 1;
 626
 627         retval = rt2x00usb_alloc_reg(rt2x00dev);
 628         if (retval)
 629                 goto exit_free_device;
 630
 631         retval = rt2x00lib_probe_dev(rt2x00dev);
 632         if (retval)
 633                 goto exit_free_reg;
 634
 635         return 0;
 636
 637 exit_free_reg:
 638         rt2x00usb_free_reg(rt2x00dev);
 639
 640 exit_free_device:
 641         ieee80211_free_hw(hw);
 642
 643 exit_put_device:
 644         usb_put_dev(usb_dev);
 645
 646         usb_set_intfdata(usb_intf, NULL);
 647
 648         return retval;
 649 }
 650 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 651
 652 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 653 {
 654         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 655         struct rt2x00_dev *rt2x00dev = hw->priv;
 656
 657         /*
 658          * Free all allocated data.
 659          */
 660         rt2x00lib_remove_dev(rt2x00dev);
 661         rt2x00usb_free_reg(rt2x00dev);
 662         ieee80211_free_hw(hw);
 663
 664         /*
 665          * Free the USB device data.
 666          */
 667         usb_set_intfdata(usb_intf, NULL);
 668         usb_put_dev(interface_to_usbdev(usb_intf));
 669 }
 670 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 671
 672 #ifdef CONFIG_PM
 673 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 674 {
 675         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 676         struct rt2x00_dev *rt2x00dev = hw->priv;
 677         int retval;
 678
 679         retval = rt2x00lib_suspend(rt2x00dev, state);
 680         if (retval)
 681                 return retval;
 682
 683         rt2x00usb_free_reg(rt2x00dev);
 684
 685         /*
 686          * Decrease usbdev refcount.
 687          */
 688         usb_put_dev(interface_to_usbdev(usb_intf));
 689
 690         return 0;
 691 }
 692 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 693
 694 int rt2x00usb_resume(struct usb_interface *usb_intf)
 695 {
 696         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 697         struct rt2x00_dev *rt2x00dev = hw->priv;
 698         int retval;
 699
 700         usb_get_dev(interface_to_usbdev(usb_intf));
 701
 702         retval = rt2x00usb_alloc_reg(rt2x00dev);
 703         if (retval)
 704                 return retval;
 705
 706         retval = rt2x00lib_resume(rt2x00dev);
 707         if (retval)
 708                 goto exit_free_reg;
 709
 710         return 0;
 711
 712 exit_free_reg:
 713         rt2x00usb_free_reg(rt2x00dev);
 714
 715         return retval;
 716 }
 717 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 718 #endif /* CONFIG_PM */
 719
 720 /*
 721  * rt2x00usb module information.
 722  */
 723 MODULE_AUTHOR(DRV_PROJECT);
 724 MODULE_VERSION(DRV_VERSION);
 725 MODULE_DESCRIPTION("rt2x00 usb library");
 726 MODULE_LICENSE("GPL");