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          * 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         ieee80211_queue_work(rt2x00dev->hw, &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
 240         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags))
 241                 return;
 242
 243         /*
 244          * USB devices cannot blindly pass the skb->len as the
 245          * length of the data to usb_fill_bulk_urb. Pass the skb
 246          * to the driver to determine what the length should be.
 247          */
 248         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 249
 250         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 251                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 252                           entry->skb->data, length,
 253                           rt2x00usb_interrupt_txdone, entry);
 254
 255         usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 256 }
 257
 258 void rt2x00usb_kick_tx_queue(struct data_queue *queue)
 259 {
 260         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 261                                    rt2x00usb_kick_tx_entry);
 262 }
 263 EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue);
 264
 265 static void rt2x00usb_kill_tx_entry(struct queue_entry *entry)
 266 {
 267         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 268         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 269         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
 270
 271         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 272                 return;
 273
 274         usb_kill_urb(entry_priv->urb);
 275
 276         /*
 277          * Kill guardian urb (if required by driver).
 278          */
 279         if ((entry->queue->qid == QID_BEACON) &&
 280             (test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags)))
 281                 usb_kill_urb(bcn_priv->guardian_urb);
 282 }
 283
 284 void rt2x00usb_kill_tx_queue(struct data_queue *queue)
 285 {
 286         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 287                                    rt2x00usb_kill_tx_entry);
 288 }
 289 EXPORT_SYMBOL_GPL(rt2x00usb_kill_tx_queue);
 290
 291 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
 292 {
 293         struct queue_entry *entry;
 294         struct queue_entry_priv_usb *entry_priv;
 295         unsigned short threshold = queue->threshold;
 296
 297         WARNING(queue->rt2x00dev, "TX queue %d DMA timed out,"
 298                 " invoke forced forced reset", queue->qid);
 299
 300         /*
 301          * Temporarily disable the TX queue, this will force mac80211
 302          * to use the other queues until this queue has been restored.
 303          *
 304          * Set the queue threshold to the queue limit. This prevents the
 305          * queue from being enabled during the txdone handler.
 306          */
 307         queue->threshold = queue->limit;
 308         ieee80211_stop_queue(queue->rt2x00dev->hw, queue->qid);
 309
 310         /*
 311          * Reset all currently uploaded TX frames.
 312          */
 313         while (!rt2x00queue_empty(queue)) {
 314                 entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 315                 entry_priv = entry->priv_data;
 316                 usb_kill_urb(entry_priv->urb);
 317
 318                 /*
 319                  * We need a short delay here to wait for
 320                  * the URB to be canceled
 321                  */
 322                 do {
 323                         udelay(100);
 324                 } while (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags));
 325
 326                 /*
 327                  * Invoke the TX done handler
 328                  */
 329                 rt2x00usb_work_txdone_entry(entry);
 330         }
 331
 332         /*
 333          * The queue has been reset, and mac80211 is allowed to use the
 334          * queue again.
 335          */
 336         queue->threshold = threshold;
 337         ieee80211_wake_queue(queue->rt2x00dev->hw, queue->qid);
 338 }
 339
 340 static void rt2x00usb_watchdog_tx_status(struct data_queue *queue)
 341 {
 342         WARNING(queue->rt2x00dev, "TX queue %d status timed out,"
 343                 " invoke forced tx handler", queue->qid);
 344
 345         ieee80211_queue_work(queue->rt2x00dev->hw, &queue->rt2x00dev->txdone_work);
 346 }
 347
 348 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 349 {
 350         struct data_queue *queue;
 351
 352         tx_queue_for_each(rt2x00dev, queue) {
 353                 if (rt2x00queue_dma_timeout(queue))
 354                         rt2x00usb_watchdog_tx_dma(queue);
 355                 if (rt2x00queue_timeout(queue))
 356                         rt2x00usb_watchdog_tx_status(queue);
 357         }
 358 }
 359 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 360
 361 /*
 362  * RX data handlers.
 363  */
 364 static void rt2x00usb_work_rxdone(struct work_struct *work)
 365 {
 366         struct rt2x00_dev *rt2x00dev =
 367             container_of(work, struct rt2x00_dev, rxdone_work);
 368         struct queue_entry *entry;
 369         struct skb_frame_desc *skbdesc;
 370         u8 rxd[32];
 371
 372         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 373                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 374
 375                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 376                         break;
 377
 378                 /*
 379                  * Fill in desc fields of the skb descriptor
 380                  */
 381                 skbdesc = get_skb_frame_desc(entry->skb);
 382                 skbdesc->desc = rxd;
 383                 skbdesc->desc_len = entry->queue->desc_size;
 384
 385                 /*
 386                  * Send the frame to rt2x00lib for further processing.
 387                  */
 388                 rt2x00lib_rxdone(rt2x00dev, entry);
 389         }
 390 }
 391
 392 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 393 {
 394         struct queue_entry *entry = (struct queue_entry *)urb->context;
 395         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 396
 397         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags) ||
 398             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 399                 return;
 400
 401         /*
 402          * Report the frame as DMA done
 403          */
 404         rt2x00lib_dmadone(entry);
 405
 406         /*
 407          * Check if the received data is simply too small
 408          * to be actually valid, or if the urb is signaling
 409          * a problem.
 410          */
 411         if (urb->actual_length < entry->queue->desc_size || urb->status)
 412                 __set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 413
 414         /*
 415          * Schedule the delayed work for reading the RX status
 416          * from the device.
 417          */
 418         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->rxdone_work);
 419 }
 420
 421 /*
 422  * Radio handlers
 423  */
 424 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 425 {
 426         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 427                                     REGISTER_TIMEOUT);
 428
 429         /*
 430          * The USB version of kill_tx_queue also works
 431          * on the RX queue.
 432          */
 433         rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev->rx);
 434 }
 435 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 436
 437 /*
 438  * Device initialization handlers.
 439  */
 440 void rt2x00usb_clear_entry(struct queue_entry *entry)
 441 {
 442         struct usb_device *usb_dev =
 443             to_usb_device_intf(entry->queue->rt2x00dev->dev);
 444         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 445         int pipe;
 446
 447         entry->flags = 0;
 448
 449         if (entry->queue->qid == QID_RX) {
 450                 pipe = usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint);
 451                 usb_fill_bulk_urb(entry_priv->urb, usb_dev, pipe,
 452                                 entry->skb->data, entry->skb->len,
 453                                 rt2x00usb_interrupt_rxdone, entry);
 454
 455                 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 456                 usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 457         }
 458 }
 459 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 460
 461 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 462                                       struct usb_endpoint_descriptor *ep_desc)
 463 {
 464         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 465         int pipe;
 466
 467         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 468
 469         if (queue->qid == QID_RX) {
 470                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 471                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 472         } else {
 473                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 474                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 475         }
 476
 477         if (!queue->usb_maxpacket)
 478                 queue->usb_maxpacket = 1;
 479 }
 480
 481 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 482 {
 483         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 484         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 485         struct usb_endpoint_descriptor *ep_desc;
 486         struct data_queue *queue = rt2x00dev->tx;
 487         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 488         unsigned int i;
 489
 490         /*
 491          * Walk through all available endpoints to search for "bulk in"
 492          * and "bulk out" endpoints. When we find such endpoints collect
 493          * the information we need from the descriptor and assign it
 494          * to the queue.
 495          */
 496         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 497                 ep_desc = &intf_desc->endpoint[i].desc;
 498
 499                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 500                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 501                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 502                            (queue != queue_end(rt2x00dev))) {
 503                         rt2x00usb_assign_endpoint(queue, ep_desc);
 504                         queue = queue_next(queue);
 505
 506                         tx_ep_desc = ep_desc;
 507                 }
 508         }
 509
 510         /*
 511          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 512          */
 513         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 514                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 515                 return -EPIPE;
 516         }
 517
 518         /*
 519          * It might be possible not all queues have a dedicated endpoint.
 520          * Loop through all TX queues and copy the endpoint information
 521          * which we have gathered from already assigned endpoints.
 522          */
 523         txall_queue_for_each(rt2x00dev, queue) {
 524                 if (!queue->usb_endpoint)
 525                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 526         }
 527
 528         return 0;
 529 }
 530
 531 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 532                                struct data_queue *queue)
 533 {
 534         struct queue_entry_priv_usb *entry_priv;
 535         struct queue_entry_priv_usb_bcn *bcn_priv;
 536         unsigned int i;
 537
 538         for (i = 0; i < queue->limit; i++) {
 539                 entry_priv = queue->entries[i].priv_data;
 540                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 541                 if (!entry_priv->urb)
 542                         return -ENOMEM;
 543         }
 544
 545         /*
 546          * If this is not the beacon queue or
 547          * no guardian byte was required for the beacon,
 548          * then we are done.
 549          */
 550         if (rt2x00dev->bcn != queue ||
 551             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 552                 return 0;
 553
 554         for (i = 0; i < queue->limit; i++) {
 555                 bcn_priv = queue->entries[i].priv_data;
 556                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 557                 if (!bcn_priv->guardian_urb)
 558                         return -ENOMEM;
 559         }
 560
 561         return 0;
 562 }
 563
 564 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 565                                struct data_queue *queue)
 566 {
 567         struct queue_entry_priv_usb *entry_priv;
 568         struct queue_entry_priv_usb_bcn *bcn_priv;
 569         unsigned int i;
 570
 571         if (!queue->entries)
 572                 return;
 573
 574         for (i = 0; i < queue->limit; i++) {
 575                 entry_priv = queue->entries[i].priv_data;
 576                 usb_kill_urb(entry_priv->urb);
 577                 usb_free_urb(entry_priv->urb);
 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 (rt2x00dev->bcn != queue ||
 586             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 587                 return;
 588
 589         for (i = 0; i < queue->limit; i++) {
 590                 bcn_priv = queue->entries[i].priv_data;
 591                 usb_kill_urb(bcn_priv->guardian_urb);
 592                 usb_free_urb(bcn_priv->guardian_urb);
 593         }
 594 }
 595
 596 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 597 {
 598         struct data_queue *queue;
 599         int status;
 600
 601         /*
 602          * Find endpoints for each queue
 603          */
 604         status = rt2x00usb_find_endpoints(rt2x00dev);
 605         if (status)
 606                 goto exit;
 607
 608         /*
 609          * Allocate DMA
 610          */
 611         queue_for_each(rt2x00dev, queue) {
 612                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
 613                 if (status)
 614                         goto exit;
 615         }
 616
 617         return 0;
 618
 619 exit:
 620         rt2x00usb_uninitialize(rt2x00dev);
 621
 622         return status;
 623 }
 624 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 625
 626 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 627 {
 628         struct data_queue *queue;
 629
 630         queue_for_each(rt2x00dev, queue)
 631                 rt2x00usb_free_urb(rt2x00dev, queue);
 632 }
 633 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 634
 635 /*
 636  * USB driver handlers.
 637  */
 638 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 639 {
 640         kfree(rt2x00dev->rf);
 641         rt2x00dev->rf = NULL;
 642
 643         kfree(rt2x00dev->eeprom);
 644         rt2x00dev->eeprom = NULL;
 645
 646         kfree(rt2x00dev->csr.cache);
 647         rt2x00dev->csr.cache = NULL;
 648 }
 649
 650 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 651 {
 652         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 653         if (!rt2x00dev->csr.cache)
 654                 goto exit;
 655
 656         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 657         if (!rt2x00dev->eeprom)
 658                 goto exit;
 659
 660         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 661         if (!rt2x00dev->rf)
 662                 goto exit;
 663
 664         return 0;
 665
 666 exit:
 667         ERROR_PROBE("Failed to allocate registers.\n");
 668
 669         rt2x00usb_free_reg(rt2x00dev);
 670
 671         return -ENOMEM;
 672 }
 673
 674 int rt2x00usb_probe(struct usb_interface *usb_intf,
 675                     const struct usb_device_id *id)
 676 {
 677         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 678         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 679         struct ieee80211_hw *hw;
 680         struct rt2x00_dev *rt2x00dev;
 681         int retval;
 682
 683         usb_dev = usb_get_dev(usb_dev);
 684
 685         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 686         if (!hw) {
 687                 ERROR_PROBE("Failed to allocate hardware.\n");
 688                 retval = -ENOMEM;
 689                 goto exit_put_device;
 690         }
 691
 692         usb_set_intfdata(usb_intf, hw);
 693
 694         rt2x00dev = hw->priv;
 695         rt2x00dev->dev = &usb_intf->dev;
 696         rt2x00dev->ops = ops;
 697         rt2x00dev->hw = hw;
 698
 699         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 700
 701         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 702         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 703
 704         retval = rt2x00usb_alloc_reg(rt2x00dev);
 705         if (retval)
 706                 goto exit_free_device;
 707
 708         retval = rt2x00lib_probe_dev(rt2x00dev);
 709         if (retval)
 710                 goto exit_free_reg;
 711
 712         return 0;
 713
 714 exit_free_reg:
 715         rt2x00usb_free_reg(rt2x00dev);
 716
 717 exit_free_device:
 718         ieee80211_free_hw(hw);
 719
 720 exit_put_device:
 721         usb_put_dev(usb_dev);
 722
 723         usb_set_intfdata(usb_intf, NULL);
 724
 725         return retval;
 726 }
 727 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 728
 729 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 730 {
 731         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 732         struct rt2x00_dev *rt2x00dev = hw->priv;
 733
 734         /*
 735          * Free all allocated data.
 736          */
 737         rt2x00lib_remove_dev(rt2x00dev);
 738         rt2x00usb_free_reg(rt2x00dev);
 739         ieee80211_free_hw(hw);
 740
 741         /*
 742          * Free the USB device data.
 743          */
 744         usb_set_intfdata(usb_intf, NULL);
 745         usb_put_dev(interface_to_usbdev(usb_intf));
 746 }
 747 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 748
 749 #ifdef CONFIG_PM
 750 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 751 {
 752         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 753         struct rt2x00_dev *rt2x00dev = hw->priv;
 754         int retval;
 755
 756         retval = rt2x00lib_suspend(rt2x00dev, state);
 757         if (retval)
 758                 return retval;
 759
 760         /*
 761          * Decrease usbdev refcount.
 762          */
 763         usb_put_dev(interface_to_usbdev(usb_intf));
 764
 765         return 0;
 766 }
 767 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 768
 769 int rt2x00usb_resume(struct usb_interface *usb_intf)
 770 {
 771         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 772         struct rt2x00_dev *rt2x00dev = hw->priv;
 773
 774         usb_get_dev(interface_to_usbdev(usb_intf));
 775
 776         return rt2x00lib_resume(rt2x00dev);
 777 }
 778 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 779 #endif /* CONFIG_PM */
 780
 781 /*
 782  * rt2x00usb module information.
 783  */
 784 MODULE_AUTHOR(DRV_PROJECT);
 785 MODULE_VERSION(DRV_VERSION);
 786 MODULE_DESCRIPTION("rt2x00 usb library");
 787 MODULE_LICENSE("GPL");