drivers/net/wireless/rt2x00/rt2x00usb.c

   1 /*
   2         Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
   3         Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
   4         <http://rt2x00.serialmonkey.com>
   5
   6         This program is free software; you can redistribute it and/or modify
   7         it under the terms of the GNU General Public License as published by
   8         the Free Software Foundation; either version 2 of the License, or
   9         (at your option) any later version.
  10
  11         This program is distributed in the hope that it will be useful,
  12         but WITHOUT ANY WARRANTY; without even the implied warranty of
  13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14         GNU General Public License for more details.
  15
  16         You should have received a copy of the GNU General Public License
  17         along with this program; if not, write to the
  18         Free Software Foundation, Inc.,
  19         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 /*
  23         Module: rt2x00usb
  24         Abstract: rt2x00 generic usb device routines.
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30 #include <linux/usb.h>
  31 #include <linux/bug.h>
  32
  33 #include "rt2x00.h"
  34 #include "rt2x00usb.h"
  35
  36 /*
  37  * Interfacing with the HW.
  38  */
  39 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
  40                              const u8 request, const u8 requesttype,
  41                              const u16 offset, const u16 value,
  42                              void *buffer, const u16 buffer_length,
  43                              const int timeout)
  44 {
  45         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
  46         int status;
  47         unsigned int i;
  48         unsigned int pipe =
  49             (requesttype == USB_VENDOR_REQUEST_IN) ?
  50             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
  51
  52         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
  53                 return -ENODEV;
  54
  55         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
  56                 status = usb_control_msg(usb_dev, pipe, request, requesttype,
  57                                          value, offset, buffer, buffer_length,
  58                                          timeout);
  59                 if (status >= 0)
  60                         return 0;
  61
  62                 /*
  63                  * Check for errors
  64                  * -ENODEV: Device has disappeared, no point continuing.
  65                  * All other errors: Try again.
  66                  */
  67                 else if (status == -ENODEV) {
  68                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
  69                         break;
  70                 }
  71         }
  72
  73         ERROR(rt2x00dev,
  74               "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
  75               request, offset, status);
  76
  77         return status;
  78 }
  79 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
  80
  81 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
  82                                    const u8 request, const u8 requesttype,
  83                                    const u16 offset, void *buffer,
  84                                    const u16 buffer_length, const int timeout)
  85 {
  86         int status;
  87
  88         BUG_ON(!mutex_is_locked(&rt2x00dev->csr_mutex));
  89
  90         /*
  91          * Check for Cache availability.
  92          */
  93         if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
  94                 ERROR(rt2x00dev, "CSR cache not available.\n");
  95                 return -ENOMEM;
  96         }
  97
  98         if (requesttype == USB_VENDOR_REQUEST_OUT)
  99                 memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
 100
 101         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
 102                                           offset, 0, rt2x00dev->csr.cache,
 103                                           buffer_length, timeout);
 104
 105         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
 106                 memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
 107
 108         return status;
 109 }
 110 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
 111
 112 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 113                                   const u8 request, const u8 requesttype,
 114                                   const u16 offset, void *buffer,
 115                                   const u16 buffer_length, const int timeout)
 116 {
 117         int status = 0;
 118         unsigned char *tb;
 119         u16 off, len, bsize;
 120
 121         mutex_lock(&rt2x00dev->csr_mutex);
 122
 123         tb  = (char *)buffer;
 124         off = offset;
 125         len = buffer_length;
 126         while (len && !status) {
 127                 bsize = min_t(u16, CSR_CACHE_SIZE, len);
 128                 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
 129                                                         requesttype, off, tb,
 130                                                         bsize, timeout);
 131
 132                 tb  += bsize;
 133                 len -= bsize;
 134                 off += bsize;
 135         }
 136
 137         mutex_unlock(&rt2x00dev->csr_mutex);
 138
 139         return status;
 140 }
 141 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 142
 143 int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
 144                            const unsigned int offset,
 145                            const struct rt2x00_field32 field,
 146                            u32 *reg)
 147 {
 148         unsigned int i;
 149
 150         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 151                 return -ENODEV;
 152
 153         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
 154                 rt2x00usb_register_read_lock(rt2x00dev, offset, reg);
 155                 if (!rt2x00_get_field32(*reg, field))
 156                         return 1;
 157                 udelay(REGISTER_BUSY_DELAY);
 158         }
 159
 160         ERROR(rt2x00dev, "Indirect register access failed: "
 161               "offset=0x%.08x, value=0x%.08x\n", offset, *reg);
 162         *reg = ~0;
 163
 164         return 0;
 165 }
 166 EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read);
 167
 168 /*
 169  * TX data handlers.
 170  */
 171 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
 172 {
 173         /*
 174          * If the transfer to hardware succeeded, it does not mean the
 175          * frame was send out correctly. It only means the frame
 176          * was successfully pushed to the hardware, we have no
 177          * way to determine the transmission status right now.
 178          * (Only indirectly by looking at the failed TX counters
 179          * in the register).
 180          */
 181         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 182                 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
 183         else
 184                 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
 185 }
 186
 187 static void rt2x00usb_work_txdone(struct work_struct *work)
 188 {
 189         struct rt2x00_dev *rt2x00dev =
 190             container_of(work, struct rt2x00_dev, txdone_work);
 191         struct data_queue *queue;
 192         struct queue_entry *entry;
 193
 194         tx_queue_for_each(rt2x00dev, queue) {
 195                 while (!rt2x00queue_empty(queue)) {
 196                         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 197
 198                         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 199                             !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 200                                 break;
 201
 202                         rt2x00usb_work_txdone_entry(entry);
 203                 }
 204         }
 205 }
 206
 207 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 208 {
 209         struct queue_entry *entry = (struct queue_entry *)urb->context;
 210         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 211
 212         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 213                 return;
 214
 215         /*
 216          * Report the frame as DMA done
 217          */
 218         rt2x00lib_dmadone(entry);
 219
 220         /*
 221          * Check if the frame was correctly uploaded
 222          */
 223         if (urb->status)
 224                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 225
 226         /*
 227          * Schedule the delayed work for reading the TX status
 228          * from the device.
 229          */
 230         queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
 231 }
 232
 233 static void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
 234 {
 235         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 236         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 237         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 238         u32 length;
 239         int status;
 240
 241         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
 242             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 243                 return;
 244
 245         /*
 246          * USB devices cannot blindly pass the skb->len as the
 247          * length of the data to usb_fill_bulk_urb. Pass the skb
 248          * to the driver to determine what the length should be.
 249          */
 250         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 251
 252         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 253                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 254                           entry->skb->data, length,
 255                           rt2x00usb_interrupt_txdone, entry);
 256
 257         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 258         if (status) {
 259                 if (status == -ENODEV)
 260                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 261                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 262                 rt2x00lib_dmadone(entry);
 263         }
 264 }
 265
 266 /*
 267  * RX data handlers.
 268  */
 269 static void rt2x00usb_work_rxdone(struct work_struct *work)
 270 {
 271         struct rt2x00_dev *rt2x00dev =
 272             container_of(work, struct rt2x00_dev, rxdone_work);
 273         struct queue_entry *entry;
 274         struct skb_frame_desc *skbdesc;
 275         u8 rxd[32];
 276
 277         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 278                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 279
 280                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 281                     !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 282                         break;
 283
 284                 /*
 285                  * Fill in desc fields of the skb descriptor
 286                  */
 287                 skbdesc = get_skb_frame_desc(entry->skb);
 288                 skbdesc->desc = rxd;
 289                 skbdesc->desc_len = entry->queue->desc_size;
 290
 291                 /*
 292                  * Send the frame to rt2x00lib for further processing.
 293                  */
 294                 rt2x00lib_rxdone(entry);
 295         }
 296 }
 297
 298 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 299 {
 300         struct queue_entry *entry = (struct queue_entry *)urb->context;
 301         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 302
 303         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 304                 return;
 305
 306         /*
 307          * Report the frame as DMA done
 308          */
 309         rt2x00lib_dmadone(entry);
 310
 311         /*
 312          * Check if the received data is simply too small
 313          * to be actually valid, or if the urb is signaling
 314          * a problem.
 315          */
 316         if (urb->actual_length < entry->queue->desc_size || urb->status)
 317                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 318
 319         /*
 320          * Schedule the delayed work for reading the RX status
 321          * from the device.
 322          */
 323         queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
 324 }
 325
 326 static void rt2x00usb_kick_rx_entry(struct queue_entry *entry)
 327 {
 328         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 329         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 330         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 331         int status;
 332
 333         if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 334             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 335                 return;
 336
 337         rt2x00lib_dmastart(entry);
 338
 339         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 340                           usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
 341                           entry->skb->data, entry->skb->len,
 342                           rt2x00usb_interrupt_rxdone, entry);
 343
 344         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 345         if (status) {
 346                 if (status == -ENODEV)
 347                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 348                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 349                 rt2x00lib_dmadone(entry);
 350         }
 351 }
 352
 353 void rt2x00usb_kick_queue(struct data_queue *queue)
 354 {
 355         switch (queue->qid) {
 356         case QID_AC_VO:
 357         case QID_AC_VI:
 358         case QID_AC_BE:
 359         case QID_AC_BK:
 360                 if (!rt2x00queue_empty(queue))
 361                         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 362                                                    rt2x00usb_kick_tx_entry);
 363                 break;
 364         case QID_RX:
 365                 if (!rt2x00queue_full(queue))
 366                         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 367                                                    rt2x00usb_kick_rx_entry);
 368                 break;
 369         default:
 370                 break;
 371         }
 372 }
 373 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
 374
 375 static void rt2x00usb_flush_entry(struct queue_entry *entry)
 376 {
 377         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 378         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 379         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
 380
 381         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 382                 return;
 383
 384         usb_kill_urb(entry_priv->urb);
 385
 386         /*
 387          * Kill guardian urb (if required by driver).
 388          */
 389         if ((entry->queue->qid == QID_BEACON) &&
 390             (test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags)))
 391                 usb_kill_urb(bcn_priv->guardian_urb);
 392 }
 393
 394 void rt2x00usb_flush_queue(struct data_queue *queue)
 395 {
 396         struct work_struct *completion;
 397         unsigned int i;
 398
 399         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 400                                    rt2x00usb_flush_entry);
 401
 402         /*
 403          * Obtain the queue completion handler
 404          */
 405         switch (queue->qid) {
 406         case QID_AC_VO:
 407         case QID_AC_VI:
 408         case QID_AC_BE:
 409         case QID_AC_BK:
 410                 completion = &queue->rt2x00dev->txdone_work;
 411                 break;
 412         case QID_RX:
 413                 completion = &queue->rt2x00dev->rxdone_work;
 414                 break;
 415         default:
 416                 return;
 417         }
 418
 419         for (i = 0; i < 20; i++) {
 420                 /*
 421                  * Check if the driver is already done, otherwise we
 422                  * have to sleep a little while to give the driver/hw
 423                  * the oppurtunity to complete interrupt process itself.
 424                  */
 425                 if (rt2x00queue_empty(queue))
 426                         break;
 427
 428                 /*
 429                  * Schedule the completion handler manually, when this
 430                  * worker function runs, it should cleanup the queue.
 431                  */
 432                 queue_work(queue->rt2x00dev->workqueue, completion);
 433
 434                 /*
 435                  * Wait for a little while to give the driver
 436                  * the oppurtunity to recover itself.
 437                  */
 438                 msleep(10);
 439         }
 440 }
 441 EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue);
 442
 443 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
 444 {
 445         WARNING(queue->rt2x00dev, "TX queue %d DMA timed out,"
 446                 " invoke forced forced reset\n", queue->qid);
 447
 448         rt2x00queue_flush_queue(queue, true);
 449 }
 450
 451 static void rt2x00usb_watchdog_tx_status(struct data_queue *queue)
 452 {
 453         WARNING(queue->rt2x00dev, "TX queue %d status timed out,"
 454                 " invoke forced tx handler\n", queue->qid);
 455
 456         queue_work(queue->rt2x00dev->workqueue, &queue->rt2x00dev->txdone_work);
 457 }
 458
 459 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 460 {
 461         struct data_queue *queue;
 462
 463         tx_queue_for_each(rt2x00dev, queue) {
 464                 if (!rt2x00queue_empty(queue)) {
 465                         if (rt2x00queue_dma_timeout(queue))
 466                                 rt2x00usb_watchdog_tx_dma(queue);
 467                         if (rt2x00queue_status_timeout(queue))
 468                                 rt2x00usb_watchdog_tx_status(queue);
 469                 }
 470         }
 471 }
 472 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 473
 474 /*
 475  * Radio handlers
 476  */
 477 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 478 {
 479         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 480                                     REGISTER_TIMEOUT);
 481 }
 482 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 483
 484 /*
 485  * Device initialization handlers.
 486  */
 487 void rt2x00usb_clear_entry(struct queue_entry *entry)
 488 {
 489         entry->flags = 0;
 490
 491         if (entry->queue->qid == QID_RX)
 492                 rt2x00usb_kick_rx_entry(entry);
 493 }
 494 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 495
 496 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 497                                       struct usb_endpoint_descriptor *ep_desc)
 498 {
 499         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 500         int pipe;
 501
 502         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 503
 504         if (queue->qid == QID_RX) {
 505                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 506                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 507         } else {
 508                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 509                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 510         }
 511
 512         if (!queue->usb_maxpacket)
 513                 queue->usb_maxpacket = 1;
 514 }
 515
 516 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 517 {
 518         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 519         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 520         struct usb_endpoint_descriptor *ep_desc;
 521         struct data_queue *queue = rt2x00dev->tx;
 522         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 523         unsigned int i;
 524
 525         /*
 526          * Walk through all available endpoints to search for "bulk in"
 527          * and "bulk out" endpoints. When we find such endpoints collect
 528          * the information we need from the descriptor and assign it
 529          * to the queue.
 530          */
 531         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 532                 ep_desc = &intf_desc->endpoint[i].desc;
 533
 534                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 535                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 536                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 537                            (queue != queue_end(rt2x00dev))) {
 538                         rt2x00usb_assign_endpoint(queue, ep_desc);
 539                         queue = queue_next(queue);
 540
 541                         tx_ep_desc = ep_desc;
 542                 }
 543         }
 544
 545         /*
 546          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 547          */
 548         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 549                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 550                 return -EPIPE;
 551         }
 552
 553         /*
 554          * It might be possible not all queues have a dedicated endpoint.
 555          * Loop through all TX queues and copy the endpoint information
 556          * which we have gathered from already assigned endpoints.
 557          */
 558         txall_queue_for_each(rt2x00dev, queue) {
 559                 if (!queue->usb_endpoint)
 560                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 561         }
 562
 563         return 0;
 564 }
 565
 566 static int rt2x00usb_alloc_entries(struct data_queue *queue)
 567 {
 568         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 569         struct queue_entry_priv_usb *entry_priv;
 570         struct queue_entry_priv_usb_bcn *bcn_priv;
 571         unsigned int i;
 572
 573         for (i = 0; i < queue->limit; i++) {
 574                 entry_priv = queue->entries[i].priv_data;
 575                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 576                 if (!entry_priv->urb)
 577                         return -ENOMEM;
 578         }
 579
 580         /*
 581          * If this is not the beacon queue or
 582          * no guardian byte was required for the beacon,
 583          * then we are done.
 584          */
 585         if (queue->qid != QID_BEACON ||
 586             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 587                 return 0;
 588
 589         for (i = 0; i < queue->limit; i++) {
 590                 bcn_priv = queue->entries[i].priv_data;
 591                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 592                 if (!bcn_priv->guardian_urb)
 593                         return -ENOMEM;
 594         }
 595
 596         return 0;
 597 }
 598
 599 static void rt2x00usb_free_entries(struct data_queue *queue)
 600 {
 601         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 602         struct queue_entry_priv_usb *entry_priv;
 603         struct queue_entry_priv_usb_bcn *bcn_priv;
 604         unsigned int i;
 605
 606         if (!queue->entries)
 607                 return;
 608
 609         for (i = 0; i < queue->limit; i++) {
 610                 entry_priv = queue->entries[i].priv_data;
 611                 usb_kill_urb(entry_priv->urb);
 612                 usb_free_urb(entry_priv->urb);
 613         }
 614
 615         /*
 616          * If this is not the beacon queue or
 617          * no guardian byte was required for the beacon,
 618          * then we are done.
 619          */
 620         if (queue->qid != QID_BEACON ||
 621             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 622                 return;
 623
 624         for (i = 0; i < queue->limit; i++) {
 625                 bcn_priv = queue->entries[i].priv_data;
 626                 usb_kill_urb(bcn_priv->guardian_urb);
 627                 usb_free_urb(bcn_priv->guardian_urb);
 628         }
 629 }
 630
 631 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 632 {
 633         struct data_queue *queue;
 634         int status;
 635
 636         /*
 637          * Find endpoints for each queue
 638          */
 639         status = rt2x00usb_find_endpoints(rt2x00dev);
 640         if (status)
 641                 goto exit;
 642
 643         /*
 644          * Allocate DMA
 645          */
 646         queue_for_each(rt2x00dev, queue) {
 647                 status = rt2x00usb_alloc_entries(queue);
 648                 if (status)
 649                         goto exit;
 650         }
 651
 652         return 0;
 653
 654 exit:
 655         rt2x00usb_uninitialize(rt2x00dev);
 656
 657         return status;
 658 }
 659 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 660
 661 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 662 {
 663         struct data_queue *queue;
 664
 665         queue_for_each(rt2x00dev, queue)
 666                 rt2x00usb_free_entries(queue);
 667 }
 668 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 669
 670 /*
 671  * USB driver handlers.
 672  */
 673 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 674 {
 675         kfree(rt2x00dev->rf);
 676         rt2x00dev->rf = NULL;
 677
 678         kfree(rt2x00dev->eeprom);
 679         rt2x00dev->eeprom = NULL;
 680
 681         kfree(rt2x00dev->csr.cache);
 682         rt2x00dev->csr.cache = NULL;
 683 }
 684
 685 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 686 {
 687         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 688         if (!rt2x00dev->csr.cache)
 689                 goto exit;
 690
 691         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 692         if (!rt2x00dev->eeprom)
 693                 goto exit;
 694
 695         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 696         if (!rt2x00dev->rf)
 697                 goto exit;
 698
 699         return 0;
 700
 701 exit:
 702         ERROR_PROBE("Failed to allocate registers.\n");
 703
 704         rt2x00usb_free_reg(rt2x00dev);
 705
 706         return -ENOMEM;
 707 }
 708
 709 int rt2x00usb_probe(struct usb_interface *usb_intf,
 710                     const struct usb_device_id *id)
 711 {
 712         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 713         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 714         struct ieee80211_hw *hw;
 715         struct rt2x00_dev *rt2x00dev;
 716         int retval;
 717
 718         usb_dev = usb_get_dev(usb_dev);
 719
 720         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 721         if (!hw) {
 722                 ERROR_PROBE("Failed to allocate hardware.\n");
 723                 retval = -ENOMEM;
 724                 goto exit_put_device;
 725         }
 726
 727         usb_set_intfdata(usb_intf, hw);
 728
 729         rt2x00dev = hw->priv;
 730         rt2x00dev->dev = &usb_intf->dev;
 731         rt2x00dev->ops = ops;
 732         rt2x00dev->hw = hw;
 733
 734         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 735
 736         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 737         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 738
 739         retval = rt2x00usb_alloc_reg(rt2x00dev);
 740         if (retval)
 741                 goto exit_free_device;
 742
 743         retval = rt2x00lib_probe_dev(rt2x00dev);
 744         if (retval)
 745                 goto exit_free_reg;
 746
 747         return 0;
 748
 749 exit_free_reg:
 750         rt2x00usb_free_reg(rt2x00dev);
 751
 752 exit_free_device:
 753         ieee80211_free_hw(hw);
 754
 755 exit_put_device:
 756         usb_put_dev(usb_dev);
 757
 758         usb_set_intfdata(usb_intf, NULL);
 759
 760         return retval;
 761 }
 762 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 763
 764 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 765 {
 766         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 767         struct rt2x00_dev *rt2x00dev = hw->priv;
 768
 769         /*
 770          * Free all allocated data.
 771          */
 772         rt2x00lib_remove_dev(rt2x00dev);
 773         rt2x00usb_free_reg(rt2x00dev);
 774         ieee80211_free_hw(hw);
 775
 776         /*
 777          * Free the USB device data.
 778          */
 779         usb_set_intfdata(usb_intf, NULL);
 780         usb_put_dev(interface_to_usbdev(usb_intf));
 781 }
 782 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 783
 784 #ifdef CONFIG_PM
 785 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 786 {
 787         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 788         struct rt2x00_dev *rt2x00dev = hw->priv;
 789         int retval;
 790
 791         retval = rt2x00lib_suspend(rt2x00dev, state);
 792         if (retval)
 793                 return retval;
 794
 795         /*
 796          * Decrease usbdev refcount.
 797          */
 798         usb_put_dev(interface_to_usbdev(usb_intf));
 799
 800         return 0;
 801 }
 802 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 803
 804 int rt2x00usb_resume(struct usb_interface *usb_intf)
 805 {
 806         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 807         struct rt2x00_dev *rt2x00dev = hw->priv;
 808
 809         usb_get_dev(interface_to_usbdev(usb_intf));
 810
 811         return rt2x00lib_resume(rt2x00dev);
 812 }
 813 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 814 #endif /* CONFIG_PM */
 815
 816 /*
 817  * rt2x00usb module information.
 818  */
 819 MODULE_AUTHOR(DRV_PROJECT);
 820 MODULE_VERSION(DRV_VERSION);
 821 MODULE_DESCRIPTION("rt2x00 usb library");
 822 MODULE_LICENSE("GPL");