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