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 succesfully 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                                 break;
 200
 201                         rt2x00usb_work_txdone_entry(entry);
 202                 }
 203         }
 204 }
 205
 206 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 207 {
 208         struct queue_entry *entry = (struct queue_entry *)urb->context;
 209         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 210
 211         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags) ||
 212             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 213                 return;
 214
 215         /*
 216          * Check if the frame was correctly uploaded
 217          */
 218         if (urb->status)
 219                 __set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 220
 221         /*
 222          * Schedule the delayed work for reading the TX status
 223          * from the device.
 224          */
 225         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->txdone_work);
 226 }
 227
 228 static void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
 229 {
 230         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 231         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 232         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 233         u32 length;
 234
 235         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags))
 236                 return;
 237
 238         /*
 239          * USB devices cannot blindly pass the skb->len as the
 240          * length of the data to usb_fill_bulk_urb. Pass the skb
 241          * to the driver to determine what the length should be.
 242          */
 243         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 244
 245         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 246                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 247                           entry->skb->data, length,
 248                           rt2x00usb_interrupt_txdone, entry);
 249
 250         usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 251 }
 252
 253 void rt2x00usb_kick_tx_queue(struct data_queue *queue)
 254 {
 255         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 256                                    rt2x00usb_kick_tx_entry);
 257 }
 258 EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue);
 259
 260 static void rt2x00usb_kill_tx_entry(struct queue_entry *entry)
 261 {
 262         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 263         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 264         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
 265
 266         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 267                 return;
 268
 269         usb_kill_urb(entry_priv->urb);
 270
 271         /*
 272          * Kill guardian urb (if required by driver).
 273          */
 274         if ((entry->queue->qid == QID_BEACON) &&
 275             (test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags)))
 276                 usb_kill_urb(bcn_priv->guardian_urb);
 277 }
 278
 279 void rt2x00usb_kill_tx_queue(struct data_queue *queue)
 280 {
 281         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 282                                    rt2x00usb_kill_tx_entry);
 283 }
 284 EXPORT_SYMBOL_GPL(rt2x00usb_kill_tx_queue);
 285
 286 static void rt2x00usb_watchdog_reset_tx(struct data_queue *queue)
 287 {
 288         struct queue_entry *entry;
 289         struct queue_entry_priv_usb *entry_priv;
 290         unsigned short threshold = queue->threshold;
 291
 292         WARNING(queue->rt2x00dev, "TX queue %d timed out, invoke reset", queue->qid);
 293
 294         /*
 295          * Temporarily disable the TX queue, this will force mac80211
 296          * to use the other queues until this queue has been restored.
 297          *
 298          * Set the queue threshold to the queue limit. This prevents the
 299          * queue from being enabled during the txdone handler.
 300          */
 301         queue->threshold = queue->limit;
 302         ieee80211_stop_queue(queue->rt2x00dev->hw, queue->qid);
 303
 304         /*
 305          * Reset all currently uploaded TX frames.
 306          */
 307         while (!rt2x00queue_empty(queue)) {
 308                 entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 309                 entry_priv = entry->priv_data;
 310                 usb_kill_urb(entry_priv->urb);
 311
 312                 /*
 313                  * We need a short delay here to wait for
 314                  * the URB to be canceled
 315                  */
 316                 do {
 317                         udelay(100);
 318                 } while (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags));
 319
 320                 /*
 321                  * Invoke the TX done handler
 322                  */
 323                 rt2x00usb_work_txdone_entry(entry);
 324         }
 325
 326         /*
 327          * The queue has been reset, and mac80211 is allowed to use the
 328          * queue again.
 329          */
 330         queue->threshold = threshold;
 331         ieee80211_wake_queue(queue->rt2x00dev->hw, queue->qid);
 332 }
 333
 334 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 335 {
 336         struct data_queue *queue;
 337
 338         tx_queue_for_each(rt2x00dev, queue) {
 339                 if (rt2x00queue_timeout(queue))
 340                         rt2x00usb_watchdog_reset_tx(queue);
 341         }
 342 }
 343 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 344
 345 /*
 346  * RX data handlers.
 347  */
 348 static void rt2x00usb_work_rxdone(struct work_struct *work)
 349 {
 350         struct rt2x00_dev *rt2x00dev =
 351             container_of(work, struct rt2x00_dev, rxdone_work);
 352         struct queue_entry *entry;
 353         struct skb_frame_desc *skbdesc;
 354         u8 rxd[32];
 355
 356         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 357                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 358
 359                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 360                         break;
 361
 362                 /*
 363                  * Fill in desc fields of the skb descriptor
 364                  */
 365                 skbdesc = get_skb_frame_desc(entry->skb);
 366                 skbdesc->desc = rxd;
 367                 skbdesc->desc_len = entry->queue->desc_size;
 368
 369                 /*
 370                  * Send the frame to rt2x00lib for further processing.
 371                  */
 372                 rt2x00lib_rxdone(rt2x00dev, entry);
 373         }
 374 }
 375
 376 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 377 {
 378         struct queue_entry *entry = (struct queue_entry *)urb->context;
 379         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 380
 381         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags) ||
 382             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 383                 return;
 384
 385         /*
 386          * Check if the received data is simply too small
 387          * to be actually valid, or if the urb is signaling
 388          * a problem.
 389          */
 390         if (urb->actual_length < entry->queue->desc_size || urb->status)
 391                 __set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 392
 393         /*
 394          * Schedule the delayed work for reading the RX status
 395          * from the device.
 396          */
 397         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->rxdone_work);
 398 }
 399
 400 /*
 401  * Radio handlers
 402  */
 403 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 404 {
 405         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 406                                     REGISTER_TIMEOUT);
 407
 408         /*
 409          * The USB version of kill_tx_queue also works
 410          * on the RX queue.
 411          */
 412         rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev->rx);
 413 }
 414 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 415
 416 /*
 417  * Device initialization handlers.
 418  */
 419 void rt2x00usb_clear_entry(struct queue_entry *entry)
 420 {
 421         struct usb_device *usb_dev =
 422             to_usb_device_intf(entry->queue->rt2x00dev->dev);
 423         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 424         int pipe;
 425
 426         entry->flags = 0;
 427
 428         if (entry->queue->qid == QID_RX) {
 429                 pipe = usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint);
 430                 usb_fill_bulk_urb(entry_priv->urb, usb_dev, pipe,
 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 }
 438 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 439
 440 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 441                                       struct usb_endpoint_descriptor *ep_desc)
 442 {
 443         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 444         int pipe;
 445
 446         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 447
 448         if (queue->qid == QID_RX) {
 449                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 450                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 451         } else {
 452                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 453                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 454         }
 455
 456         if (!queue->usb_maxpacket)
 457                 queue->usb_maxpacket = 1;
 458 }
 459
 460 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 461 {
 462         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 463         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 464         struct usb_endpoint_descriptor *ep_desc;
 465         struct data_queue *queue = rt2x00dev->tx;
 466         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 467         unsigned int i;
 468
 469         /*
 470          * Walk through all available endpoints to search for "bulk in"
 471          * and "bulk out" endpoints. When we find such endpoints collect
 472          * the information we need from the descriptor and assign it
 473          * to the queue.
 474          */
 475         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 476                 ep_desc = &intf_desc->endpoint[i].desc;
 477
 478                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 479                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 480                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 481                            (queue != queue_end(rt2x00dev))) {
 482                         rt2x00usb_assign_endpoint(queue, ep_desc);
 483                         queue = queue_next(queue);
 484
 485                         tx_ep_desc = ep_desc;
 486                 }
 487         }
 488
 489         /*
 490          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 491          */
 492         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 493                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 494                 return -EPIPE;
 495         }
 496
 497         /*
 498          * It might be possible not all queues have a dedicated endpoint.
 499          * Loop through all TX queues and copy the endpoint information
 500          * which we have gathered from already assigned endpoints.
 501          */
 502         txall_queue_for_each(rt2x00dev, queue) {
 503                 if (!queue->usb_endpoint)
 504                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 505         }
 506
 507         return 0;
 508 }
 509
 510 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 511                                struct data_queue *queue)
 512 {
 513         struct queue_entry_priv_usb *entry_priv;
 514         struct queue_entry_priv_usb_bcn *bcn_priv;
 515         unsigned int i;
 516
 517         for (i = 0; i < queue->limit; i++) {
 518                 entry_priv = queue->entries[i].priv_data;
 519                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 520                 if (!entry_priv->urb)
 521                         return -ENOMEM;
 522         }
 523
 524         /*
 525          * If this is not the beacon queue or
 526          * no guardian byte was required for the beacon,
 527          * then we are done.
 528          */
 529         if (rt2x00dev->bcn != queue ||
 530             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 531                 return 0;
 532
 533         for (i = 0; i < queue->limit; i++) {
 534                 bcn_priv = queue->entries[i].priv_data;
 535                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 536                 if (!bcn_priv->guardian_urb)
 537                         return -ENOMEM;
 538         }
 539
 540         return 0;
 541 }
 542
 543 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 544                                struct data_queue *queue)
 545 {
 546         struct queue_entry_priv_usb *entry_priv;
 547         struct queue_entry_priv_usb_bcn *bcn_priv;
 548         unsigned int i;
 549
 550         if (!queue->entries)
 551                 return;
 552
 553         for (i = 0; i < queue->limit; i++) {
 554                 entry_priv = queue->entries[i].priv_data;
 555                 usb_kill_urb(entry_priv->urb);
 556                 usb_free_urb(entry_priv->urb);
 557         }
 558
 559         /*
 560          * If this is not the beacon queue or
 561          * no guardian byte was required for the beacon,
 562          * then we are done.
 563          */
 564         if (rt2x00dev->bcn != queue ||
 565             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 566                 return;
 567
 568         for (i = 0; i < queue->limit; i++) {
 569                 bcn_priv = queue->entries[i].priv_data;
 570                 usb_kill_urb(bcn_priv->guardian_urb);
 571                 usb_free_urb(bcn_priv->guardian_urb);
 572         }
 573 }
 574
 575 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 576 {
 577         struct data_queue *queue;
 578         int status;
 579
 580         /*
 581          * Find endpoints for each queue
 582          */
 583         status = rt2x00usb_find_endpoints(rt2x00dev);
 584         if (status)
 585                 goto exit;
 586
 587         /*
 588          * Allocate DMA
 589          */
 590         queue_for_each(rt2x00dev, queue) {
 591                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
 592                 if (status)
 593                         goto exit;
 594         }
 595
 596         return 0;
 597
 598 exit:
 599         rt2x00usb_uninitialize(rt2x00dev);
 600
 601         return status;
 602 }
 603 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 604
 605 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 606 {
 607         struct data_queue *queue;
 608
 609         queue_for_each(rt2x00dev, queue)
 610                 rt2x00usb_free_urb(rt2x00dev, queue);
 611 }
 612 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 613
 614 /*
 615  * USB driver handlers.
 616  */
 617 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 618 {
 619         kfree(rt2x00dev->rf);
 620         rt2x00dev->rf = NULL;
 621
 622         kfree(rt2x00dev->eeprom);
 623         rt2x00dev->eeprom = NULL;
 624
 625         kfree(rt2x00dev->csr.cache);
 626         rt2x00dev->csr.cache = NULL;
 627 }
 628
 629 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 630 {
 631         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 632         if (!rt2x00dev->csr.cache)
 633                 goto exit;
 634
 635         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 636         if (!rt2x00dev->eeprom)
 637                 goto exit;
 638
 639         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 640         if (!rt2x00dev->rf)
 641                 goto exit;
 642
 643         return 0;
 644
 645 exit:
 646         ERROR_PROBE("Failed to allocate registers.\n");
 647
 648         rt2x00usb_free_reg(rt2x00dev);
 649
 650         return -ENOMEM;
 651 }
 652
 653 int rt2x00usb_probe(struct usb_interface *usb_intf,
 654                     const struct usb_device_id *id)
 655 {
 656         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 657         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 658         struct ieee80211_hw *hw;
 659         struct rt2x00_dev *rt2x00dev;
 660         int retval;
 661
 662         usb_dev = usb_get_dev(usb_dev);
 663
 664         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 665         if (!hw) {
 666                 ERROR_PROBE("Failed to allocate hardware.\n");
 667                 retval = -ENOMEM;
 668                 goto exit_put_device;
 669         }
 670
 671         usb_set_intfdata(usb_intf, hw);
 672
 673         rt2x00dev = hw->priv;
 674         rt2x00dev->dev = &usb_intf->dev;
 675         rt2x00dev->ops = ops;
 676         rt2x00dev->hw = hw;
 677
 678         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 679
 680         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 681         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 682
 683         retval = rt2x00usb_alloc_reg(rt2x00dev);
 684         if (retval)
 685                 goto exit_free_device;
 686
 687         retval = rt2x00lib_probe_dev(rt2x00dev);
 688         if (retval)
 689                 goto exit_free_reg;
 690
 691         return 0;
 692
 693 exit_free_reg:
 694         rt2x00usb_free_reg(rt2x00dev);
 695
 696 exit_free_device:
 697         ieee80211_free_hw(hw);
 698
 699 exit_put_device:
 700         usb_put_dev(usb_dev);
 701
 702         usb_set_intfdata(usb_intf, NULL);
 703
 704         return retval;
 705 }
 706 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 707
 708 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 709 {
 710         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 711         struct rt2x00_dev *rt2x00dev = hw->priv;
 712
 713         /*
 714          * Free all allocated data.
 715          */
 716         rt2x00lib_remove_dev(rt2x00dev);
 717         rt2x00usb_free_reg(rt2x00dev);
 718         ieee80211_free_hw(hw);
 719
 720         /*
 721          * Free the USB device data.
 722          */
 723         usb_set_intfdata(usb_intf, NULL);
 724         usb_put_dev(interface_to_usbdev(usb_intf));
 725 }
 726 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 727
 728 #ifdef CONFIG_PM
 729 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 730 {
 731         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 732         struct rt2x00_dev *rt2x00dev = hw->priv;
 733         int retval;
 734
 735         retval = rt2x00lib_suspend(rt2x00dev, state);
 736         if (retval)
 737                 return retval;
 738
 739         /*
 740          * Decrease usbdev refcount.
 741          */
 742         usb_put_dev(interface_to_usbdev(usb_intf));
 743
 744         return 0;
 745 }
 746 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 747
 748 int rt2x00usb_resume(struct usb_interface *usb_intf)
 749 {
 750         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 751         struct rt2x00_dev *rt2x00dev = hw->priv;
 752
 753         usb_get_dev(interface_to_usbdev(usb_intf));
 754
 755         return rt2x00lib_resume(rt2x00dev);
 756 }
 757 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 758 #endif /* CONFIG_PM */
 759
 760 /*
 761  * rt2x00usb module information.
 762  */
 763 MODULE_AUTHOR(DRV_PROJECT);
 764 MODULE_VERSION(DRV_VERSION);
 765 MODULE_DESCRIPTION("rt2x00 usb library");
 766 MODULE_LICENSE("GPL");