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   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         unsigned int reserved_size;
 250
 251         /*
 252          * The frame size includes descriptor size, because the
 253          * hardware directly receive the frame into the skbuffer.
 254          */
 255         frame_size = queue->data_size + queue->desc_size;
 256
 257         /*
 258          * For the allocation we should keep a few things in mind:
 259          * 1) 4byte alignment of 802.11 payload
 260          *
 261          * For (1) we need at most 4 bytes to guarentee the correct
 262          * alignment. We are going to optimize the fact that the chance
 263          * that the 802.11 header_size % 4 == 2 is much bigger then
 264          * anything else. However since we need to move the frame up
 265          * to 3 bytes to the front, which means we need to preallocate
 266          * 6 bytes.
 267          */
 268         reserved_size = 6;
 269
 270         /*
 271          * Allocate skbuffer.
 272          */
 273         skb = dev_alloc_skb(frame_size + reserved_size);
 274         if (!skb)
 275                 return NULL;
 276
 277         skb_reserve(skb, reserved_size);
 278         skb_put(skb, frame_size);
 279
 280         return skb;
 281 }
 282
 283 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 284 {
 285         struct queue_entry *entry = (struct queue_entry *)urb->context;
 286         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 287         struct sk_buff *skb;
 288         struct skb_frame_desc *skbdesc;
 289         struct rxdone_entry_desc rxdesc;
 290         unsigned int header_size;
 291         unsigned int align;
 292
 293         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 294             !test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 295                 return;
 296
 297         /*
 298          * Check if the received data is simply too small
 299          * to be actually valid, or if the urb is signaling
 300          * a problem.
 301          */
 302         if (urb->actual_length < entry->queue->desc_size || urb->status)
 303                 goto skip_entry;
 304
 305         /*
 306          * Fill in skb descriptor
 307          */
 308         skbdesc = get_skb_frame_desc(entry->skb);
 309         memset(skbdesc, 0, sizeof(*skbdesc));
 310         skbdesc->entry = entry;
 311
 312         memset(&rxdesc, 0, sizeof(rxdesc));
 313         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 314
 315         header_size = ieee80211_get_hdrlen_from_skb(entry->skb);
 316
 317         /*
 318          * The data behind the ieee80211 header must be
 319          * aligned on a 4 byte boundary. We already reserved
 320          * 2 bytes for header_size % 4 == 2 optimization.
 321          * To determine the number of bytes which the data
 322          * should be moved to the left, we must add these
 323          * 2 bytes to the header_size.
 324          */
 325         align = (header_size + 2) % 4;
 326
 327         if (align) {
 328                 skb_push(entry->skb, align);
 329                 /* Move entire frame in 1 command */
 330                 memmove(entry->skb->data, entry->skb->data + align,
 331                         rxdesc.size);
 332         }
 333
 334         /* Update data pointers, trim buffer to correct size */
 335         skbdesc->data = entry->skb->data;
 336         skb_trim(entry->skb, rxdesc.size);
 337
 338         /*
 339          * Allocate a new sk buffer to replace the current one.
 340          * If allocation fails, we should drop the current frame
 341          * so we can recycle the existing sk buffer for the new frame.
 342          */
 343         skb = rt2x00usb_alloc_rxskb(entry->queue);
 344         if (!skb)
 345                 goto skip_entry;
 346
 347         /*
 348          * Send the frame to rt2x00lib for further processing.
 349          */
 350         rt2x00lib_rxdone(entry, &rxdesc);
 351
 352         /*
 353          * Replace current entry's skb with the newly allocated one,
 354          * and reinitialize the urb.
 355          */
 356         entry->skb = skb;
 357         urb->transfer_buffer = entry->skb->data;
 358         urb->transfer_buffer_length = entry->skb->len;
 359
 360 skip_entry:
 361         if (test_bit(DEVICE_ENABLED_RADIO, &entry->queue->rt2x00dev->flags)) {
 362                 __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 363                 usb_submit_urb(urb, GFP_ATOMIC);
 364         }
 365
 366         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 367 }
 368
 369 /*
 370  * Radio handlers
 371  */
 372 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 373 {
 374         struct queue_entry_priv_usb_rx *priv_rx;
 375         struct queue_entry_priv_usb_tx *priv_tx;
 376         struct queue_entry_priv_usb_bcn *priv_bcn;
 377         struct data_queue *queue;
 378         unsigned int i;
 379
 380         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 381                                     REGISTER_TIMEOUT);
 382
 383         /*
 384          * Cancel all queues.
 385          */
 386         for (i = 0; i < rt2x00dev->rx->limit; i++) {
 387                 priv_rx = rt2x00dev->rx->entries[i].priv_data;
 388                 usb_kill_urb(priv_rx->urb);
 389         }
 390
 391         tx_queue_for_each(rt2x00dev, queue) {
 392                 for (i = 0; i < queue->limit; i++) {
 393                         priv_tx = queue->entries[i].priv_data;
 394                         usb_kill_urb(priv_tx->urb);
 395                 }
 396         }
 397
 398         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
 399                 priv_bcn = rt2x00dev->bcn->entries[i].priv_data;
 400                 usb_kill_urb(priv_bcn->urb);
 401
 402                 if (priv_bcn->guardian_urb)
 403                         usb_kill_urb(priv_bcn->guardian_urb);
 404         }
 405
 406         if (!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
 407                 return;
 408
 409         for (i = 0; i < rt2x00dev->bcn[1].limit; i++) {
 410                 priv_tx = rt2x00dev->bcn[1].entries[i].priv_data;
 411                 usb_kill_urb(priv_tx->urb);
 412         }
 413 }
 414 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 415
 416 /*
 417  * Device initialization handlers.
 418  */
 419 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
 420                             struct queue_entry *entry)
 421 {
 422         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
 423         struct queue_entry_priv_usb_rx *priv_rx = entry->priv_data;
 424
 425         usb_fill_bulk_urb(priv_rx->urb, usb_dev,
 426                           usb_rcvbulkpipe(usb_dev, 1),
 427                           entry->skb->data, entry->skb->len,
 428                           rt2x00usb_interrupt_rxdone, entry);
 429
 430         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 431         usb_submit_urb(priv_rx->urb, GFP_ATOMIC);
 432 }
 433 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
 434
 435 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
 436                             struct queue_entry *entry)
 437 {
 438         entry->flags = 0;
 439 }
 440 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
 441
 442 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 443                                struct data_queue *queue)
 444 {
 445         struct queue_entry_priv_usb_rx *priv_rx;
 446         struct queue_entry_priv_usb_tx *priv_tx;
 447         struct queue_entry_priv_usb_bcn *priv_bcn;
 448         struct urb *urb;
 449         unsigned int guardian =
 450             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
 451         unsigned int i;
 452
 453         /*
 454          * Allocate the URB's
 455          */
 456         for (i = 0; i < queue->limit; i++) {
 457                 urb = usb_alloc_urb(0, GFP_KERNEL);
 458                 if (!urb)
 459                         return -ENOMEM;
 460
 461                 if (queue->qid == QID_RX) {
 462                         priv_rx = queue->entries[i].priv_data;
 463                         priv_rx->urb = urb;
 464                 } else if (queue->qid == QID_MGMT && guardian) {
 465                         priv_bcn = queue->entries[i].priv_data;
 466                         priv_bcn->urb = urb;
 467
 468                         urb = usb_alloc_urb(0, GFP_KERNEL);
 469                         if (!urb)
 470                                 return -ENOMEM;
 471
 472                         priv_bcn->guardian_urb = urb;
 473                 } else {
 474                         priv_tx = queue->entries[i].priv_data;
 475                         priv_tx->urb = urb;
 476                 }
 477         }
 478
 479         return 0;
 480 }
 481
 482 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 483                                struct data_queue *queue)
 484 {
 485         struct queue_entry_priv_usb_rx *priv_rx;
 486         struct queue_entry_priv_usb_tx *priv_tx;
 487         struct queue_entry_priv_usb_bcn *priv_bcn;
 488         struct urb *urb;
 489         unsigned int guardian =
 490             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
 491         unsigned int i;
 492
 493         if (!queue->entries)
 494                 return;
 495
 496         for (i = 0; i < queue->limit; i++) {
 497                 if (queue->qid == QID_RX) {
 498                         priv_rx = queue->entries[i].priv_data;
 499                         urb = priv_rx->urb;
 500                 } else if (queue->qid == QID_MGMT && guardian) {
 501                         priv_bcn = queue->entries[i].priv_data;
 502
 503                         usb_kill_urb(priv_bcn->guardian_urb);
 504                         usb_free_urb(priv_bcn->guardian_urb);
 505
 506                         urb = priv_bcn->urb;
 507                 } else {
 508                         priv_tx = queue->entries[i].priv_data;
 509                         urb = priv_tx->urb;
 510                 }
 511
 512                 usb_kill_urb(urb);
 513                 usb_free_urb(urb);
 514                 if (queue->entries[i].skb)
 515                         kfree_skb(queue->entries[i].skb);
 516         }
 517 }
 518
 519 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 520 {
 521         struct data_queue *queue;
 522         struct sk_buff *skb;
 523         unsigned int entry_size;
 524         unsigned int i;
 525         int uninitialized_var(status);
 526
 527         /*
 528          * Allocate DMA
 529          */
 530         queue_for_each(rt2x00dev, queue) {
 531                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
 532                 if (status)
 533                         goto exit;
 534         }
 535
 536         /*
 537          * For the RX queue, skb's should be allocated.
 538          */
 539         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
 540         for (i = 0; i < rt2x00dev->rx->limit; i++) {
 541                 skb = rt2x00usb_alloc_rxskb(rt2x00dev->rx);
 542                 if (!skb)
 543                         goto exit;
 544
 545                 rt2x00dev->rx->entries[i].skb = skb;
 546         }
 547
 548         return 0;
 549
 550 exit:
 551         rt2x00usb_uninitialize(rt2x00dev);
 552
 553         return status;
 554 }
 555 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 556
 557 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 558 {
 559         struct data_queue *queue;
 560
 561         queue_for_each(rt2x00dev, queue)
 562                 rt2x00usb_free_urb(rt2x00dev, queue);
 563 }
 564 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 565
 566 /*
 567  * USB driver handlers.
 568  */
 569 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 570 {
 571         kfree(rt2x00dev->rf);
 572         rt2x00dev->rf = NULL;
 573
 574         kfree(rt2x00dev->eeprom);
 575         rt2x00dev->eeprom = NULL;
 576
 577         kfree(rt2x00dev->csr.cache);
 578         rt2x00dev->csr.cache = NULL;
 579 }
 580
 581 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 582 {
 583         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 584         if (!rt2x00dev->csr.cache)
 585                 goto exit;
 586
 587         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 588         if (!rt2x00dev->eeprom)
 589                 goto exit;
 590
 591         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 592         if (!rt2x00dev->rf)
 593                 goto exit;
 594
 595         return 0;
 596
 597 exit:
 598         ERROR_PROBE("Failed to allocate registers.\n");
 599
 600         rt2x00usb_free_reg(rt2x00dev);
 601
 602         return -ENOMEM;
 603 }
 604
 605 int rt2x00usb_probe(struct usb_interface *usb_intf,
 606                     const struct usb_device_id *id)
 607 {
 608         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 609         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 610         struct ieee80211_hw *hw;
 611         struct rt2x00_dev *rt2x00dev;
 612         int retval;
 613
 614         usb_dev = usb_get_dev(usb_dev);
 615
 616         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 617         if (!hw) {
 618                 ERROR_PROBE("Failed to allocate hardware.\n");
 619                 retval = -ENOMEM;
 620                 goto exit_put_device;
 621         }
 622
 623         usb_set_intfdata(usb_intf, hw);
 624
 625         rt2x00dev = hw->priv;
 626         rt2x00dev->dev = usb_intf;
 627         rt2x00dev->ops = ops;
 628         rt2x00dev->hw = hw;
 629         mutex_init(&rt2x00dev->usb_cache_mutex);
 630
 631         rt2x00dev->usb_maxpacket =
 632             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
 633         if (!rt2x00dev->usb_maxpacket)
 634                 rt2x00dev->usb_maxpacket = 1;
 635
 636         retval = rt2x00usb_alloc_reg(rt2x00dev);
 637         if (retval)
 638                 goto exit_free_device;
 639
 640         retval = rt2x00lib_probe_dev(rt2x00dev);
 641         if (retval)
 642                 goto exit_free_reg;
 643
 644         return 0;
 645
 646 exit_free_reg:
 647         rt2x00usb_free_reg(rt2x00dev);
 648
 649 exit_free_device:
 650         ieee80211_free_hw(hw);
 651
 652 exit_put_device:
 653         usb_put_dev(usb_dev);
 654
 655         usb_set_intfdata(usb_intf, NULL);
 656
 657         return retval;
 658 }
 659 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 660
 661 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 662 {
 663         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 664         struct rt2x00_dev *rt2x00dev = hw->priv;
 665
 666         /*
 667          * Free all allocated data.
 668          */
 669         rt2x00lib_remove_dev(rt2x00dev);
 670         rt2x00usb_free_reg(rt2x00dev);
 671         ieee80211_free_hw(hw);
 672
 673         /*
 674          * Free the USB device data.
 675          */
 676         usb_set_intfdata(usb_intf, NULL);
 677         usb_put_dev(interface_to_usbdev(usb_intf));
 678 }
 679 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 680
 681 #ifdef CONFIG_PM
 682 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 683 {
 684         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 685         struct rt2x00_dev *rt2x00dev = hw->priv;
 686         int retval;
 687
 688         retval = rt2x00lib_suspend(rt2x00dev, state);
 689         if (retval)
 690                 return retval;
 691
 692         rt2x00usb_free_reg(rt2x00dev);
 693
 694         /*
 695          * Decrease usbdev refcount.
 696          */
 697         usb_put_dev(interface_to_usbdev(usb_intf));
 698
 699         return 0;
 700 }
 701 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 702
 703 int rt2x00usb_resume(struct usb_interface *usb_intf)
 704 {
 705         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 706         struct rt2x00_dev *rt2x00dev = hw->priv;
 707         int retval;
 708
 709         usb_get_dev(interface_to_usbdev(usb_intf));
 710
 711         retval = rt2x00usb_alloc_reg(rt2x00dev);
 712         if (retval)
 713                 return retval;
 714
 715         retval = rt2x00lib_resume(rt2x00dev);
 716         if (retval)
 717                 goto exit_free_reg;
 718
 719         return 0;
 720
 721 exit_free_reg:
 722         rt2x00usb_free_reg(rt2x00dev);
 723
 724         return retval;
 725 }
 726 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 727 #endif /* CONFIG_PM */
 728
 729 /*
 730  * rt2x00usb module information.
 731  */
 732 MODULE_AUTHOR(DRV_PROJECT);
 733 MODULE_VERSION(DRV_VERSION);
 734 MODULE_DESCRIPTION("rt2x00 usb library");
 735 MODULE_LICENSE("GPL");