err.no Git - linux-2.6/blob - drivers/net/wireless/rt2x00/rt2x00usb.c

   1 /*
   2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00usb
  23         Abstract: rt2x00 generic usb device routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/usb.h>
  29 #include <linux/bug.h>
  30
  31 #include "rt2x00.h"
  32 #include "rt2x00usb.h"
  33
  34 /*
  35  * Interfacing with the HW.
  36  */
  37 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
  38                              const u8 request, const u8 requesttype,
  39                              const u16 offset, const u16 value,
  40                              void *buffer, const u16 buffer_length,
  41                              const int timeout)
  42 {
  43         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
  44         int status;
  45         unsigned int i;
  46         unsigned int pipe =
  47             (requesttype == USB_VENDOR_REQUEST_IN) ?
  48             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
  49
  50
  51         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
  52                 status = usb_control_msg(usb_dev, pipe, request, requesttype,
  53                                          value, offset, buffer, buffer_length,
  54                                          timeout);
  55                 if (status >= 0)
  56                         return 0;
  57
  58                 /*
  59                  * Check for errors
  60                  * -ENODEV: Device has disappeared, no point continuing.
  61                  * All other errors: Try again.
  62                  */
  63                 else if (status == -ENODEV)
  64                         break;
  65         }
  66
  67         ERROR(rt2x00dev,
  68               "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
  69               request, offset, status);
  70
  71         return status;
  72 }
  73 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
  74
  75 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
  76                                    const u8 request, const u8 requesttype,
  77                                    const u16 offset, void *buffer,
  78                                    const u16 buffer_length, const int timeout)
  79 {
  80         int status;
  81
  82         BUG_ON(!mutex_is_locked(&rt2x00dev->usb_cache_mutex));
  83
  84         /*
  85          * Check for Cache availability.
  86          */
  87         if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
  88                 ERROR(rt2x00dev, "CSR cache not available.\n");
  89                 return -ENOMEM;
  90         }
  91
  92         if (requesttype == USB_VENDOR_REQUEST_OUT)
  93                 memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
  94
  95         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
  96                                           offset, 0, rt2x00dev->csr.cache,
  97                                           buffer_length, timeout);
  98
  99         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
 100                 memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
 101
 102         return status;
 103 }
 104 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
 105
 106 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 107                                   const u8 request, const u8 requesttype,
 108                                   const u16 offset, void *buffer,
 109                                   const u16 buffer_length, const int timeout)
 110 {
 111         int status;
 112
 113         mutex_lock(&rt2x00dev->usb_cache_mutex);
 114
 115         status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
 116                                                 requesttype, offset, buffer,
 117                                                 buffer_length, timeout);
 118
 119         mutex_unlock(&rt2x00dev->usb_cache_mutex);
 120
 121         return status;
 122 }
 123 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 124
 125 /*
 126  * TX data handlers.
 127  */
 128 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 129 {
 130         struct queue_entry *entry = (struct queue_entry *)urb->context;
 131         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 132         struct queue_entry_priv_usb_tx *priv_tx = entry->priv_data;
 133         struct txdone_entry_desc txdesc;
 134         __le32 *txd = (__le32 *)entry->skb->data;
 135         u32 word;
 136
 137         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 138             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 139                 return;
 140
 141         rt2x00_desc_read(txd, 0, &word);
 142
 143         /*
 144          * Remove the descriptor data from the buffer.
 145          */
 146         skb_pull(entry->skb, entry->queue->desc_size);
 147
 148         /*
 149          * Obtain the status about this packet.
 150          * Note that when the status is 0 it does not mean the
 151          * frame was send out correctly. It only means the frame
 152          * was succesfully pushed to the hardware, we have no
 153          * way to determine the transmission status right now.
 154          * (Only indirectly by looking at the failed TX counters
 155          * in the register).
 156          */
 157         if (!urb->status)
 158                 __set_bit(TXDONE_UNKNOWN, &txdesc.flags);
 159         else
 160                 __set_bit(TXDONE_FAILURE, &txdesc.flags);
 161         txdesc.retry = 0;
 162         txdesc.control = &priv_tx->control;
 163
 164         rt2x00lib_txdone(entry, &txdesc);
 165
 166         /*
 167          * Make this entry available for reuse.
 168          */
 169         entry->flags = 0;
 170         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 171
 172         /*
 173          * If the data queue was full before the txdone handler
 174          * we must make sure the packet queue in the mac80211 stack
 175          * is reenabled when the txdone handler has finished.
 176          */
 177         if (!rt2x00queue_full(entry->queue))
 178                 ieee80211_wake_queue(rt2x00dev->hw, priv_tx->control.queue);
 179 }
 180
 181 int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
 182                             struct data_queue *queue, struct sk_buff *skb,
 183                             struct ieee80211_tx_control *control)
 184 {
 185         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
 186         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
 187         struct queue_entry_priv_usb_tx *priv_tx = entry->priv_data;
 188         struct skb_frame_desc *skbdesc;
 189         u32 length;
 190
 191         if (rt2x00queue_full(queue))
 192                 return -EINVAL;
 193
 194         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
 195                 ERROR(rt2x00dev,
 196                       "Arrived at non-free entry in the non-full queue %d.\n"
 197                       "Please file bug report to %s.\n",
 198                       entry->queue->qid, DRV_PROJECT);
 199                 return -EINVAL;
 200         }
 201
 202         /*
 203          * Add the descriptor in front of the skb.
 204          */
 205         skb_push(skb, queue->desc_size);
 206         memset(skb->data, 0, queue->desc_size);
 207
 208         /*
 209          * Fill in skb descriptor
 210          */
 211         skbdesc = get_skb_frame_desc(skb);
 212         skbdesc->data = skb->data + queue->desc_size;
 213         skbdesc->data_len = skb->len - queue->desc_size;
 214         skbdesc->desc = skb->data;
 215         skbdesc->desc_len = queue->desc_size;
 216         skbdesc->entry = entry;
 217
 218         memcpy(&priv_tx->control, control, sizeof(priv_tx->control));
 219         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
 220
 221         /*
 222          * USB devices cannot blindly pass the skb->len as the
 223          * length of the data to usb_fill_bulk_urb. Pass the skb
 224          * to the driver to determine what the length should be.
 225          */
 226         length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, skb);
 227
 228         /*
 229          * Initialize URB and send the frame to the device.
 230          */
 231         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 232         usb_fill_bulk_urb(priv_tx->urb, usb_dev, usb_sndbulkpipe(usb_dev, 1),
 233                           skb->data, length, rt2x00usb_interrupt_txdone, entry);
 234         usb_submit_urb(priv_tx->urb, GFP_ATOMIC);
 235
 236         rt2x00queue_index_inc(queue, Q_INDEX);
 237
 238         return 0;
 239 }
 240 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
 241
 242 /*
 243  * RX data handlers.
 244  */
 245 static struct sk_buff* rt2x00usb_alloc_rxskb(struct data_queue *queue)
 246 {
 247         struct sk_buff *skb;
 248         unsigned int frame_size;
 249
 250         /*
 251          * As alignment we use 2 and not NET_IP_ALIGN because we need
 252          * to be sure we have 2 bytes room in the head. (NET_IP_ALIGN
 253          * can be 0 on some hardware). We use these 2 bytes for frame
 254          * alignment later, we assume that the chance that
 255          * header_size % 4 == 2 is bigger then header_size % 2 == 0
 256          * and thus optimize alignment by reserving the 2 bytes in
 257          * advance.
 258          */
 259         frame_size = queue->data_size + queue->desc_size;
 260         skb = dev_alloc_skb(queue->desc_size + frame_size + 2);
 261         if (!skb)
 262                 return NULL;
 263
 264         skb_reserve(skb, queue->desc_size + 2);
 265         skb_put(skb, frame_size);
 266
 267         return skb;
 268 }
 269
 270 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 271 {
 272         struct queue_entry *entry = (struct queue_entry *)urb->context;
 273         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 274         struct sk_buff *skb;
 275         struct skb_frame_desc *skbdesc;
 276         struct rxdone_entry_desc rxdesc;
 277         int header_size;
 278
 279         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 280             !test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 281                 return;
 282
 283         /*
 284          * Check if the received data is simply too small
 285          * to be actually valid, or if the urb is signaling
 286          * a problem.
 287          */
 288         if (urb->actual_length < entry->queue->desc_size || urb->status)
 289                 goto skip_entry;
 290
 291         /*
 292          * Fill in skb descriptor
 293          */
 294         skbdesc = get_skb_frame_desc(entry->skb);
 295         memset(skbdesc, 0, sizeof(*skbdesc));
 296         skbdesc->entry = entry;
 297
 298         memset(&rxdesc, 0, sizeof(rxdesc));
 299         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 300
 301         /*
 302          * The data behind the ieee80211 header must be
 303          * aligned on a 4 byte boundary.
 304          */
 305         header_size = ieee80211_get_hdrlen_from_skb(entry->skb);
 306         if (header_size % 4 == 0) {
 307                 skb_push(entry->skb, 2);
 308                 memmove(entry->skb->data, entry->skb->data + 2,
 309                         entry->skb->len - 2);
 310                 skbdesc->data = entry->skb->data;
 311                 skb_trim(entry->skb,entry->skb->len - 2);
 312         }
 313
 314         /*
 315          * Allocate a new sk buffer to replace the current one.
 316          * If allocation fails, we should drop the current frame
 317          * so we can recycle the existing sk buffer for the new frame.
 318          */
 319         skb = rt2x00usb_alloc_rxskb(entry->queue);
 320         if (!skb)
 321                 goto skip_entry;
 322
 323         /*
 324          * Send the frame to rt2x00lib for further processing.
 325          */
 326         rt2x00lib_rxdone(entry, &rxdesc);
 327
 328         /*
 329          * Replace current entry's skb with the newly allocated one,
 330          * and reinitialize the urb.
 331          */
 332         entry->skb = skb;
 333         urb->transfer_buffer = entry->skb->data;
 334         urb->transfer_buffer_length = entry->skb->len;
 335
 336 skip_entry:
 337         if (test_bit(DEVICE_ENABLED_RADIO, &entry->queue->rt2x00dev->flags)) {
 338                 __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 339                 usb_submit_urb(urb, GFP_ATOMIC);
 340         }
 341
 342         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 343 }
 344
 345 /*
 346  * Radio handlers
 347  */
 348 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 349 {
 350         struct queue_entry_priv_usb_rx *priv_rx;
 351         struct queue_entry_priv_usb_tx *priv_tx;
 352         struct queue_entry_priv_usb_bcn *priv_bcn;
 353         struct data_queue *queue;
 354         unsigned int i;
 355
 356         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 357                                     REGISTER_TIMEOUT);
 358
 359         /*
 360          * Cancel all queues.
 361          */
 362         for (i = 0; i < rt2x00dev->rx->limit; i++) {
 363                 priv_rx = rt2x00dev->rx->entries[i].priv_data;
 364                 usb_kill_urb(priv_rx->urb);
 365         }
 366
 367         tx_queue_for_each(rt2x00dev, queue) {
 368                 for (i = 0; i < queue->limit; i++) {
 369                         priv_tx = queue->entries[i].priv_data;
 370                         usb_kill_urb(priv_tx->urb);
 371                 }
 372         }
 373
 374         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
 375                 priv_bcn = rt2x00dev->bcn->entries[i].priv_data;
 376                 usb_kill_urb(priv_bcn->urb);
 377
 378                 if (priv_bcn->guardian_urb)
 379                         usb_kill_urb(priv_bcn->guardian_urb);
 380         }
 381
 382         if (!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
 383                 return;
 384
 385         for (i = 0; i < rt2x00dev->bcn[1].limit; i++) {
 386                 priv_tx = rt2x00dev->bcn[1].entries[i].priv_data;
 387                 usb_kill_urb(priv_tx->urb);
 388         }
 389 }
 390 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 391
 392 /*
 393  * Device initialization handlers.
 394  */
 395 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
 396                             struct queue_entry *entry)
 397 {
 398         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
 399         struct queue_entry_priv_usb_rx *priv_rx = entry->priv_data;
 400
 401         usb_fill_bulk_urb(priv_rx->urb, usb_dev,
 402                           usb_rcvbulkpipe(usb_dev, 1),
 403                           entry->skb->data, entry->skb->len,
 404                           rt2x00usb_interrupt_rxdone, entry);
 405
 406         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 407         usb_submit_urb(priv_rx->urb, GFP_ATOMIC);
 408 }
 409 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
 410
 411 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
 412                             struct queue_entry *entry)
 413 {
 414         entry->flags = 0;
 415 }
 416 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
 417
 418 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 419                                struct data_queue *queue)
 420 {
 421         struct queue_entry_priv_usb_rx *priv_rx;
 422         struct queue_entry_priv_usb_tx *priv_tx;
 423         struct queue_entry_priv_usb_bcn *priv_bcn;
 424         struct urb *urb;
 425         unsigned int guardian =
 426             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
 427         unsigned int i;
 428
 429         /*
 430          * Allocate the URB's
 431          */
 432         for (i = 0; i < queue->limit; i++) {
 433                 urb = usb_alloc_urb(0, GFP_KERNEL);
 434                 if (!urb)
 435                         return -ENOMEM;
 436
 437                 if (queue->qid == QID_RX) {
 438                         priv_rx = queue->entries[i].priv_data;
 439                         priv_rx->urb = urb;
 440                 } else if (queue->qid == QID_MGMT && guardian) {
 441                         priv_bcn = queue->entries[i].priv_data;
 442                         priv_bcn->urb = urb;
 443
 444                         urb = usb_alloc_urb(0, GFP_KERNEL);
 445                         if (!urb)
 446                                 return -ENOMEM;
 447
 448                         priv_bcn->guardian_urb = urb;
 449                 } else {
 450                         priv_tx = queue->entries[i].priv_data;
 451                         priv_tx->urb = urb;
 452                 }
 453         }
 454
 455         return 0;
 456 }
 457
 458 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 459                                struct data_queue *queue)
 460 {
 461         struct queue_entry_priv_usb_rx *priv_rx;
 462         struct queue_entry_priv_usb_tx *priv_tx;
 463         struct queue_entry_priv_usb_bcn *priv_bcn;
 464         struct urb *urb;
 465         unsigned int guardian =
 466             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
 467         unsigned int i;
 468
 469         if (!queue->entries)
 470                 return;
 471
 472         for (i = 0; i < queue->limit; i++) {
 473                 if (queue->qid == QID_RX) {
 474                         priv_rx = queue->entries[i].priv_data;
 475                         urb = priv_rx->urb;
 476                 } else if (queue->qid == QID_MGMT && guardian) {
 477                         priv_bcn = queue->entries[i].priv_data;
 478
 479                         usb_kill_urb(priv_bcn->guardian_urb);
 480                         usb_free_urb(priv_bcn->guardian_urb);
 481
 482                         urb = priv_bcn->urb;
 483                 } else {
 484                         priv_tx = queue->entries[i].priv_data;
 485                         urb = priv_tx->urb;
 486                 }
 487
 488                 usb_kill_urb(urb);
 489                 usb_free_urb(urb);
 490                 if (queue->entries[i].skb)
 491                         kfree_skb(queue->entries[i].skb);
 492         }
 493 }
 494
 495 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 496 {
 497         struct data_queue *queue;
 498         struct sk_buff *skb;
 499         unsigned int entry_size;
 500         unsigned int i;
 501         int uninitialized_var(status);
 502
 503         /*
 504          * Allocate DMA
 505          */
 506         queue_for_each(rt2x00dev, queue) {
 507                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
 508                 if (status)
 509                         goto exit;
 510         }
 511
 512         /*
 513          * For the RX queue, skb's should be allocated.
 514          */
 515         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
 516         for (i = 0; i < rt2x00dev->rx->limit; i++) {
 517                 skb = rt2x00usb_alloc_rxskb(rt2x00dev->rx);
 518                 if (!skb)
 519                         goto exit;
 520
 521                 rt2x00dev->rx->entries[i].skb = skb;
 522         }
 523
 524         return 0;
 525
 526 exit:
 527         rt2x00usb_uninitialize(rt2x00dev);
 528
 529         return status;
 530 }
 531 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 532
 533 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 534 {
 535         struct data_queue *queue;
 536
 537         queue_for_each(rt2x00dev, queue)
 538                 rt2x00usb_free_urb(rt2x00dev, queue);
 539 }
 540 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 541
 542 /*
 543  * USB driver handlers.
 544  */
 545 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 546 {
 547         kfree(rt2x00dev->rf);
 548         rt2x00dev->rf = NULL;
 549
 550         kfree(rt2x00dev->eeprom);
 551         rt2x00dev->eeprom = NULL;
 552
 553         kfree(rt2x00dev->csr.cache);
 554         rt2x00dev->csr.cache = NULL;
 555 }
 556
 557 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 558 {
 559         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 560         if (!rt2x00dev->csr.cache)
 561                 goto exit;
 562
 563         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 564         if (!rt2x00dev->eeprom)
 565                 goto exit;
 566
 567         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 568         if (!rt2x00dev->rf)
 569                 goto exit;
 570
 571         return 0;
 572
 573 exit:
 574         ERROR_PROBE("Failed to allocate registers.\n");
 575
 576         rt2x00usb_free_reg(rt2x00dev);
 577
 578         return -ENOMEM;
 579 }
 580
 581 int rt2x00usb_probe(struct usb_interface *usb_intf,
 582                     const struct usb_device_id *id)
 583 {
 584         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 585         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 586         struct ieee80211_hw *hw;
 587         struct rt2x00_dev *rt2x00dev;
 588         int retval;
 589
 590         usb_dev = usb_get_dev(usb_dev);
 591
 592         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 593         if (!hw) {
 594                 ERROR_PROBE("Failed to allocate hardware.\n");
 595                 retval = -ENOMEM;
 596                 goto exit_put_device;
 597         }
 598
 599         usb_set_intfdata(usb_intf, hw);
 600
 601         rt2x00dev = hw->priv;
 602         rt2x00dev->dev = usb_intf;
 603         rt2x00dev->ops = ops;
 604         rt2x00dev->hw = hw;
 605         mutex_init(&rt2x00dev->usb_cache_mutex);
 606
 607         rt2x00dev->usb_maxpacket =
 608             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
 609         if (!rt2x00dev->usb_maxpacket)
 610                 rt2x00dev->usb_maxpacket = 1;
 611
 612         retval = rt2x00usb_alloc_reg(rt2x00dev);
 613         if (retval)
 614                 goto exit_free_device;
 615
 616         retval = rt2x00lib_probe_dev(rt2x00dev);
 617         if (retval)
 618                 goto exit_free_reg;
 619
 620         return 0;
 621
 622 exit_free_reg:
 623         rt2x00usb_free_reg(rt2x00dev);
 624
 625 exit_free_device:
 626         ieee80211_free_hw(hw);
 627
 628 exit_put_device:
 629         usb_put_dev(usb_dev);
 630
 631         usb_set_intfdata(usb_intf, NULL);
 632
 633         return retval;
 634 }
 635 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 636
 637 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 638 {
 639         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 640         struct rt2x00_dev *rt2x00dev = hw->priv;
 641
 642         /*
 643          * Free all allocated data.
 644          */
 645         rt2x00lib_remove_dev(rt2x00dev);
 646         rt2x00usb_free_reg(rt2x00dev);
 647         ieee80211_free_hw(hw);
 648
 649         /*
 650          * Free the USB device data.
 651          */
 652         usb_set_intfdata(usb_intf, NULL);
 653         usb_put_dev(interface_to_usbdev(usb_intf));
 654 }
 655 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 656
 657 #ifdef CONFIG_PM
 658 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 659 {
 660         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 661         struct rt2x00_dev *rt2x00dev = hw->priv;
 662         int retval;
 663
 664         retval = rt2x00lib_suspend(rt2x00dev, state);
 665         if (retval)
 666                 return retval;
 667
 668         rt2x00usb_free_reg(rt2x00dev);
 669
 670         /*
 671          * Decrease usbdev refcount.
 672          */
 673         usb_put_dev(interface_to_usbdev(usb_intf));
 674
 675         return 0;
 676 }
 677 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 678
 679 int rt2x00usb_resume(struct usb_interface *usb_intf)
 680 {
 681         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 682         struct rt2x00_dev *rt2x00dev = hw->priv;
 683         int retval;
 684
 685         usb_get_dev(interface_to_usbdev(usb_intf));
 686
 687         retval = rt2x00usb_alloc_reg(rt2x00dev);
 688         if (retval)
 689                 return retval;
 690
 691         retval = rt2x00lib_resume(rt2x00dev);
 692         if (retval)
 693                 goto exit_free_reg;
 694
 695         return 0;
 696
 697 exit_free_reg:
 698         rt2x00usb_free_reg(rt2x00dev);
 699
 700         return retval;
 701 }
 702 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 703 #endif /* CONFIG_PM */
 704
 705 /*
 706  * rt2x00usb module information.
 707  */
 708 MODULE_AUTHOR(DRV_PROJECT);
 709 MODULE_VERSION(DRV_VERSION);
 710 MODULE_DESCRIPTION("rt2x00 usb library");
 711 MODULE_LICENSE("GPL");