Pileus Git - ~andy/linux/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 static void rt2x00usb_vendor_request_async_complete(struct urb *urb)
 126 {
 127         /*
 128          * We're done with it, descrease usage count and let the
 129          * usb layer delete it as soon as it is done with it.
 130          */
 131         usb_put_urb(urb);
 132 }
 133
 134 int rt2x00usb_vendor_request_async(struct rt2x00_dev *rt2x00dev,
 135                                    const u8 request, const u16 offset,
 136                                    const u16 value)
 137 {
 138         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
 139         struct usb_ctrlrequest *ctrl;
 140         struct urb *urb;
 141         int status;
 142
 143         urb = usb_alloc_urb(0, GFP_NOIO);
 144         if (!urb)
 145                 return -ENOMEM;
 146
 147         ctrl = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
 148         if (!ctrl) {
 149                 status = -ENOMEM;
 150                 goto exit;
 151         }
 152
 153         ctrl->bRequestType= USB_VENDOR_REQUEST_OUT;
 154         ctrl->bRequest = request;
 155         ctrl->wValue = cpu_to_le16p(&value);
 156         ctrl->wIndex = cpu_to_le16p(&offset);
 157         ctrl->wLength = 0;
 158
 159         usb_fill_control_urb(urb, usb_dev, usb_sndctrlpipe(usb_dev, 0),
 160                              (unsigned char *)ctrl, NULL, 0,
 161                              rt2x00usb_vendor_request_async_complete, NULL);
 162
 163         status = usb_submit_urb(urb, GFP_ATOMIC);
 164         if (!status)
 165                 goto exit;
 166
 167         return 0;
 168
 169 exit:
 170         usb_put_urb(urb);
 171         kfree(ctrl);
 172
 173         return status;
 174 }
 175 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_async);
 176
 177 /*
 178  * TX data handlers.
 179  */
 180 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 181 {
 182         struct queue_entry *entry = (struct queue_entry *)urb->context;
 183         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 184         struct queue_entry_priv_usb_tx *priv_tx = entry->priv_data;
 185         struct txdone_entry_desc txdesc;
 186         __le32 *txd = (__le32 *)entry->skb->data;
 187         u32 word;
 188
 189         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 190             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 191                 return;
 192
 193         rt2x00_desc_read(txd, 0, &word);
 194
 195         /*
 196          * Remove the descriptor data from the buffer.
 197          */
 198         skb_pull(entry->skb, entry->queue->desc_size);
 199
 200         /*
 201          * Obtain the status about this packet.
 202          */
 203         txdesc.status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY;
 204         txdesc.retry = 0;
 205         txdesc.control = &priv_tx->control;
 206
 207         rt2x00lib_txdone(entry, &txdesc);
 208
 209         /*
 210          * Make this entry available for reuse.
 211          */
 212         entry->flags = 0;
 213         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 214
 215         /*
 216          * If the data queue was full before the txdone handler
 217          * we must make sure the packet queue in the mac80211 stack
 218          * is reenabled when the txdone handler has finished.
 219          */
 220         if (!rt2x00queue_full(entry->queue))
 221                 ieee80211_wake_queue(rt2x00dev->hw, priv_tx->control.queue);
 222 }
 223
 224 int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
 225                             struct data_queue *queue, struct sk_buff *skb,
 226                             struct ieee80211_tx_control *control)
 227 {
 228         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
 229         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
 230         struct queue_entry_priv_usb_tx *priv_tx = entry->priv_data;
 231         struct skb_frame_desc *skbdesc;
 232         u32 length;
 233
 234         if (rt2x00queue_full(queue))
 235                 return -EINVAL;
 236
 237         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
 238                 ERROR(rt2x00dev,
 239                       "Arrived at non-free entry in the non-full queue %d.\n"
 240                       "Please file bug report to %s.\n",
 241                       control->queue, DRV_PROJECT);
 242                 return -EINVAL;
 243         }
 244
 245         /*
 246          * Add the descriptor in front of the skb.
 247          */
 248         skb_push(skb, queue->desc_size);
 249         memset(skb->data, 0, queue->desc_size);
 250
 251         /*
 252          * Fill in skb descriptor
 253          */
 254         skbdesc = get_skb_frame_desc(skb);
 255         memset(skbdesc, 0, sizeof(*skbdesc));
 256         skbdesc->data = skb->data + queue->desc_size;
 257         skbdesc->data_len = skb->len - queue->desc_size;
 258         skbdesc->desc = skb->data;
 259         skbdesc->desc_len = queue->desc_size;
 260         skbdesc->entry = entry;
 261
 262         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
 263
 264         /*
 265          * USB devices cannot blindly pass the skb->len as the
 266          * length of the data to usb_fill_bulk_urb. Pass the skb
 267          * to the driver to determine what the length should be.
 268          */
 269         length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, skb);
 270
 271         /*
 272          * Initialize URB and send the frame to the device.
 273          */
 274         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 275         usb_fill_bulk_urb(priv_tx->urb, usb_dev, usb_sndbulkpipe(usb_dev, 1),
 276                           skb->data, length, rt2x00usb_interrupt_txdone, entry);
 277         usb_submit_urb(priv_tx->urb, GFP_ATOMIC);
 278
 279         rt2x00queue_index_inc(queue, Q_INDEX);
 280
 281         return 0;
 282 }
 283 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
 284
 285 /*
 286  * RX data handlers.
 287  */
 288 static struct sk_buff* rt2x00usb_alloc_rxskb(struct data_queue *queue)
 289 {
 290         struct sk_buff *skb;
 291         unsigned int frame_size;
 292
 293         /*
 294          * As alignment we use 2 and not NET_IP_ALIGN because we need
 295          * to be sure we have 2 bytes room in the head. (NET_IP_ALIGN
 296          * can be 0 on some hardware). We use these 2 bytes for frame
 297          * alignment later, we assume that the chance that
 298          * header_size % 4 == 2 is bigger then header_size % 2 == 0
 299          * and thus optimize alignment by reserving the 2 bytes in
 300          * advance.
 301          */
 302         frame_size = queue->data_size + queue->desc_size;
 303         skb = dev_alloc_skb(frame_size + 2);
 304         if (!skb)
 305                 return NULL;
 306
 307         skb_reserve(skb, 2);
 308         skb_put(skb, frame_size);
 309
 310         return skb;
 311 }
 312
 313 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 314 {
 315         struct queue_entry *entry = (struct queue_entry *)urb->context;
 316         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 317         struct sk_buff *skb;
 318         struct skb_frame_desc *skbdesc;
 319         struct rxdone_entry_desc rxdesc;
 320
 321         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 322             !test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 323                 return;
 324
 325         /*
 326          * Check if the received data is simply too small
 327          * to be actually valid, or if the urb is signaling
 328          * a problem.
 329          */
 330         if (urb->actual_length < entry->queue->desc_size || urb->status)
 331                 goto skip_entry;
 332
 333         /*
 334          * Fill in skb descriptor
 335          */
 336         skbdesc = get_skb_frame_desc(entry->skb);
 337         memset(skbdesc, 0, sizeof(*skbdesc));
 338         skbdesc->entry = entry;
 339
 340         memset(&rxdesc, 0, sizeof(rxdesc));
 341         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 342
 343         /*
 344          * Allocate a new sk buffer to replace the current one.
 345          * If allocation fails, we should drop the current frame
 346          * so we can recycle the existing sk buffer for the new frame.
 347          */
 348         skb = rt2x00usb_alloc_rxskb(entry->queue);
 349         if (!skb)
 350                 goto skip_entry;
 351
 352         /*
 353          * Send the frame to rt2x00lib for further processing.
 354          */
 355         rt2x00lib_rxdone(entry, &rxdesc);
 356
 357         /*
 358          * Replace current entry's skb with the newly allocated one,
 359          * and reinitialize the urb.
 360          */
 361         entry->skb = skb;
 362         urb->transfer_buffer = entry->skb->data;
 363         urb->transfer_buffer_length = entry->skb->len;
 364
 365 skip_entry:
 366         if (test_bit(DEVICE_ENABLED_RADIO, &entry->queue->rt2x00dev->flags)) {
 367                 __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 368                 usb_submit_urb(urb, GFP_ATOMIC);
 369         }
 370
 371         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 372 }
 373
 374 /*
 375  * Radio handlers
 376  */
 377 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 378 {
 379         struct queue_entry_priv_usb_rx *priv_rx;
 380         struct queue_entry_priv_usb_tx *priv_tx;
 381         struct queue_entry_priv_usb_bcn *priv_bcn;
 382         struct data_queue *queue;
 383         unsigned int i;
 384
 385         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
 386                                     REGISTER_TIMEOUT);
 387
 388         /*
 389          * Cancel all queues.
 390          */
 391         for (i = 0; i < rt2x00dev->rx->limit; i++) {
 392                 priv_rx = rt2x00dev->rx->entries[i].priv_data;
 393                 usb_kill_urb(priv_rx->urb);
 394         }
 395
 396         tx_queue_for_each(rt2x00dev, queue) {
 397                 for (i = 0; i < queue->limit; i++) {
 398                         priv_tx = queue->entries[i].priv_data;
 399                         usb_kill_urb(priv_tx->urb);
 400                 }
 401         }
 402
 403         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
 404                 priv_bcn = rt2x00dev->bcn->entries[i].priv_data;
 405                 usb_kill_urb(priv_bcn->urb);
 406
 407                 if (priv_bcn->guardian_urb)
 408                         usb_kill_urb(priv_bcn->guardian_urb);
 409         }
 410
 411         if (!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
 412                 return;
 413
 414         for (i = 0; i < rt2x00dev->bcn[1].limit; i++) {
 415                 priv_tx = rt2x00dev->bcn[1].entries[i].priv_data;
 416                 usb_kill_urb(priv_tx->urb);
 417         }
 418 }
 419 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 420
 421 /*
 422  * Device initialization handlers.
 423  */
 424 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
 425                             struct queue_entry *entry)
 426 {
 427         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
 428         struct queue_entry_priv_usb_rx *priv_rx = entry->priv_data;
 429
 430         usb_fill_bulk_urb(priv_rx->urb, usb_dev,
 431                           usb_rcvbulkpipe(usb_dev, 1),
 432                           entry->skb->data, entry->skb->len,
 433                           rt2x00usb_interrupt_rxdone, entry);
 434
 435         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 436         usb_submit_urb(priv_rx->urb, GFP_ATOMIC);
 437 }
 438 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
 439
 440 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
 441                             struct queue_entry *entry)
 442 {
 443         entry->flags = 0;
 444 }
 445 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
 446
 447 static int rt2x00usb_alloc_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         /*
 459          * Allocate the URB's
 460          */
 461         for (i = 0; i < queue->limit; i++) {
 462                 urb = usb_alloc_urb(0, GFP_KERNEL);
 463                 if (!urb)
 464                         return -ENOMEM;
 465
 466                 if (queue->qid == QID_RX) {
 467                         priv_rx = queue->entries[i].priv_data;
 468                         priv_rx->urb = urb;
 469                 } else if (queue->qid == QID_MGMT && guardian) {
 470                         priv_bcn = queue->entries[i].priv_data;
 471                         priv_bcn->urb = urb;
 472
 473                         urb = usb_alloc_urb(0, GFP_KERNEL);
 474                         if (!urb)
 475                                 return -ENOMEM;
 476
 477                         priv_bcn->guardian_urb = urb;
 478                 } else {
 479                         priv_tx = queue->entries[i].priv_data;
 480                         priv_tx->urb = urb;
 481                 }
 482         }
 483
 484         return 0;
 485 }
 486
 487 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 488                                struct data_queue *queue)
 489 {
 490         struct queue_entry_priv_usb_rx *priv_rx;
 491         struct queue_entry_priv_usb_tx *priv_tx;
 492         struct queue_entry_priv_usb_bcn *priv_bcn;
 493         struct urb *urb;
 494         unsigned int guardian =
 495             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
 496         unsigned int i;
 497
 498         if (!queue->entries)
 499                 return;
 500
 501         for (i = 0; i < queue->limit; i++) {
 502                 if (queue->qid == QID_RX) {
 503                         priv_rx = queue->entries[i].priv_data;
 504                         urb = priv_rx->urb;
 505                 } else if (queue->qid == QID_MGMT && guardian) {
 506                         priv_bcn = queue->entries[i].priv_data;
 507
 508                         usb_kill_urb(priv_bcn->guardian_urb);
 509                         usb_free_urb(priv_bcn->guardian_urb);
 510
 511                         urb = priv_bcn->urb;
 512                 } else {
 513                         priv_tx = queue->entries[i].priv_data;
 514                         urb = priv_tx->urb;
 515                 }
 516
 517                 usb_kill_urb(urb);
 518                 usb_free_urb(urb);
 519                 if (queue->entries[i].skb)
 520                         kfree_skb(queue->entries[i].skb);
 521         }
 522 }
 523
 524 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 525 {
 526         struct data_queue *queue;
 527         struct sk_buff *skb;
 528         unsigned int entry_size;
 529         unsigned int i;
 530         int uninitialized_var(status);
 531
 532         /*
 533          * Allocate DMA
 534          */
 535         queue_for_each(rt2x00dev, queue) {
 536                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
 537                 if (status)
 538                         goto exit;
 539         }
 540
 541         /*
 542          * For the RX queue, skb's should be allocated.
 543          */
 544         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
 545         for (i = 0; i < rt2x00dev->rx->limit; i++) {
 546                 skb = rt2x00usb_alloc_rxskb(rt2x00dev->rx);
 547                 if (!skb)
 548                         goto exit;
 549
 550                 rt2x00dev->rx->entries[i].skb = skb;
 551         }
 552
 553         return 0;
 554
 555 exit:
 556         rt2x00usb_uninitialize(rt2x00dev);
 557
 558         return status;
 559 }
 560 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 561
 562 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 563 {
 564         struct data_queue *queue;
 565
 566         queue_for_each(rt2x00dev, queue)
 567                 rt2x00usb_free_urb(rt2x00dev, queue);
 568 }
 569 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 570
 571 /*
 572  * USB driver handlers.
 573  */
 574 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 575 {
 576         kfree(rt2x00dev->rf);
 577         rt2x00dev->rf = NULL;
 578
 579         kfree(rt2x00dev->eeprom);
 580         rt2x00dev->eeprom = NULL;
 581
 582         kfree(rt2x00dev->csr.cache);
 583         rt2x00dev->csr.cache = NULL;
 584 }
 585
 586 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 587 {
 588         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 589         if (!rt2x00dev->csr.cache)
 590                 goto exit;
 591
 592         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 593         if (!rt2x00dev->eeprom)
 594                 goto exit;
 595
 596         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 597         if (!rt2x00dev->rf)
 598                 goto exit;
 599
 600         return 0;
 601
 602 exit:
 603         ERROR_PROBE("Failed to allocate registers.\n");
 604
 605         rt2x00usb_free_reg(rt2x00dev);
 606
 607         return -ENOMEM;
 608 }
 609
 610 int rt2x00usb_probe(struct usb_interface *usb_intf,
 611                     const struct usb_device_id *id)
 612 {
 613         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 614         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 615         struct ieee80211_hw *hw;
 616         struct rt2x00_dev *rt2x00dev;
 617         int retval;
 618
 619         usb_dev = usb_get_dev(usb_dev);
 620
 621         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 622         if (!hw) {
 623                 ERROR_PROBE("Failed to allocate hardware.\n");
 624                 retval = -ENOMEM;
 625                 goto exit_put_device;
 626         }
 627
 628         usb_set_intfdata(usb_intf, hw);
 629
 630         rt2x00dev = hw->priv;
 631         rt2x00dev->dev = usb_intf;
 632         rt2x00dev->ops = ops;
 633         rt2x00dev->hw = hw;
 634         mutex_init(&rt2x00dev->usb_cache_mutex);
 635
 636         rt2x00dev->usb_maxpacket =
 637             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
 638         if (!rt2x00dev->usb_maxpacket)
 639                 rt2x00dev->usb_maxpacket = 1;
 640
 641         retval = rt2x00usb_alloc_reg(rt2x00dev);
 642         if (retval)
 643                 goto exit_free_device;
 644
 645         retval = rt2x00lib_probe_dev(rt2x00dev);
 646         if (retval)
 647                 goto exit_free_reg;
 648
 649         return 0;
 650
 651 exit_free_reg:
 652         rt2x00usb_free_reg(rt2x00dev);
 653
 654 exit_free_device:
 655         ieee80211_free_hw(hw);
 656
 657 exit_put_device:
 658         usb_put_dev(usb_dev);
 659
 660         usb_set_intfdata(usb_intf, NULL);
 661
 662         return retval;
 663 }
 664 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 665
 666 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 667 {
 668         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 669         struct rt2x00_dev *rt2x00dev = hw->priv;
 670
 671         /*
 672          * Free all allocated data.
 673          */
 674         rt2x00lib_remove_dev(rt2x00dev);
 675         rt2x00usb_free_reg(rt2x00dev);
 676         ieee80211_free_hw(hw);
 677
 678         /*
 679          * Free the USB device data.
 680          */
 681         usb_set_intfdata(usb_intf, NULL);
 682         usb_put_dev(interface_to_usbdev(usb_intf));
 683 }
 684 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 685
 686 #ifdef CONFIG_PM
 687 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 688 {
 689         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 690         struct rt2x00_dev *rt2x00dev = hw->priv;
 691         int retval;
 692
 693         retval = rt2x00lib_suspend(rt2x00dev, state);
 694         if (retval)
 695                 return retval;
 696
 697         rt2x00usb_free_reg(rt2x00dev);
 698
 699         /*
 700          * Decrease usbdev refcount.
 701          */
 702         usb_put_dev(interface_to_usbdev(usb_intf));
 703
 704         return 0;
 705 }
 706 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 707
 708 int rt2x00usb_resume(struct usb_interface *usb_intf)
 709 {
 710         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 711         struct rt2x00_dev *rt2x00dev = hw->priv;
 712         int retval;
 713
 714         usb_get_dev(interface_to_usbdev(usb_intf));
 715
 716         retval = rt2x00usb_alloc_reg(rt2x00dev);
 717         if (retval)
 718                 return retval;
 719
 720         retval = rt2x00lib_resume(rt2x00dev);
 721         if (retval)
 722                 goto exit_free_reg;
 723
 724         return 0;
 725
 726 exit_free_reg:
 727         rt2x00usb_free_reg(rt2x00dev);
 728
 729         return retval;
 730 }
 731 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 732 #endif /* CONFIG_PM */
 733
 734 /*
 735  * rt2x00usb module information.
 736  */
 737 MODULE_AUTHOR(DRV_PROJECT);
 738 MODULE_VERSION(DRV_VERSION);
 739 MODULE_DESCRIPTION("rt2x00 usb library");
 740 MODULE_LICENSE("GPL");