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_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 212                 return;
 213
 214         /*
 215          * Report the frame as DMA done
 216          */
 217         rt2x00lib_dmadone(entry);
 218
 219         /*
 220          * Check if the frame was correctly uploaded
 221          */
 222         if (urb->status)
 223                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 224
 225         /*
 226          * Schedule the delayed work for reading the TX status
 227          * from the device.
 228          */
 229         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->txdone_work);
 230 }
 231
 232 static void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
 233 {
 234         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 235         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 236         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 237         u32 length;
 238         int status;
 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         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 256         if (status) {
 257                 if (status == -ENODEV)
 258                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 259                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 260                 rt2x00lib_dmadone(entry);
 261         }
 262 }
 263
 264 void rt2x00usb_kick_tx_queue(struct data_queue *queue)
 265 {
 266         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 267                                    rt2x00usb_kick_tx_entry);
 268 }
 269 EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue);
 270
 271 static void rt2x00usb_kill_tx_entry(struct queue_entry *entry)
 272 {
 273         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 274         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 275         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
 276
 277         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 278                 return;
 279
 280         usb_kill_urb(entry_priv->urb);
 281
 282         /*
 283          * Kill guardian urb (if required by driver).
 284          */
 285         if ((entry->queue->qid == QID_BEACON) &&
 286             (test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags)))
 287                 usb_kill_urb(bcn_priv->guardian_urb);
 288 }
 289
 290 void rt2x00usb_kill_tx_queue(struct data_queue *queue)
 291 {
 292         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 293                                    rt2x00usb_kill_tx_entry);
 294 }
 295 EXPORT_SYMBOL_GPL(rt2x00usb_kill_tx_queue);
 296
 297 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
 298 {
 299         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 300         unsigned short threshold = queue->threshold;
 301
 302         WARNING(queue->rt2x00dev, "TX queue %d DMA timed out,"
 303                 " invoke forced forced reset", queue->qid);
 304
 305         /*
 306          * Temporarily disable the TX queue, this will force mac80211
 307          * to use the other queues until this queue has been restored.
 308          *
 309          * Set the queue threshold to the queue limit. This prevents the
 310          * queue from being enabled during the txdone handler.
 311          */
 312         queue->threshold = queue->limit;
 313         ieee80211_stop_queue(rt2x00dev->hw, queue->qid);
 314
 315         /*
 316          * Kill all entries in the queue, afterwards we need to
 317          * wait a bit for all URBs to be cancelled.
 318          */
 319         rt2x00usb_kill_tx_queue(queue);
 320
 321         /*
 322          * In case that a driver has overriden the txdone_work
 323          * function, we invoke the TX done through there.
 324          */
 325         rt2x00dev->txdone_work.func(&rt2x00dev->txdone_work);
 326
 327         /*
 328          * The queue has been reset, and mac80211 is allowed to use the
 329          * queue again.
 330          */
 331         queue->threshold = threshold;
 332         ieee80211_wake_queue(rt2x00dev->hw, queue->qid);
 333 }
 334
 335 static void rt2x00usb_watchdog_tx_status(struct data_queue *queue)
 336 {
 337         WARNING(queue->rt2x00dev, "TX queue %d status timed out,"
 338                 " invoke forced tx handler", queue->qid);
 339
 340         ieee80211_queue_work(queue->rt2x00dev->hw, &queue->rt2x00dev->txdone_work);
 341 }
 342
 343 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 344 {
 345         struct data_queue *queue;
 346
 347         tx_queue_for_each(rt2x00dev, queue) {
 348                 if (!rt2x00queue_empty(queue)) {
 349                         if (rt2x00queue_dma_timeout(queue))
 350                                 rt2x00usb_watchdog_tx_dma(queue);
 351                         if (rt2x00queue_status_timeout(queue))
 352                                 rt2x00usb_watchdog_tx_status(queue);
 353                 }
 354         }
 355 }
 356 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 357
 358 /*
 359  * RX data handlers.
 360  */
 361 static void rt2x00usb_work_rxdone(struct work_struct *work)
 362 {
 363         struct rt2x00_dev *rt2x00dev =
 364             container_of(work, struct rt2x00_dev, rxdone_work);
 365         struct queue_entry *entry;
 366         struct skb_frame_desc *skbdesc;
 367         u8 rxd[32];
 368
 369         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 370                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 371
 372                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 373                         break;
 374
 375                 /*
 376                  * Fill in desc fields of the skb descriptor
 377                  */
 378                 skbdesc = get_skb_frame_desc(entry->skb);
 379                 skbdesc->desc = rxd;
 380                 skbdesc->desc_len = entry->queue->desc_size;
 381
 382                 /*
 383                  * Send the frame to rt2x00lib for further processing.
 384                  */
 385                 rt2x00lib_rxdone(entry);
 386         }
 387 }
 388
 389 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 390 {
 391         struct queue_entry *entry = (struct queue_entry *)urb->context;
 392         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 393
 394         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 395                 return;
 396
 397         /*
 398          * Report the frame as DMA done
 399          */
 400         rt2x00lib_dmadone(entry);
 401
 402         /*
 403          * Check if the received data is simply too small
 404          * to be actually valid, or if the urb is signaling
 405          * a problem.
 406          */
 407         if (urb->actual_length < entry->queue->desc_size || urb->status)
 408                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 409
 410         /*
 411          * Schedule the delayed work for reading the RX status
 412          * from the device.
 413          */
 414         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->rxdone_work);
 415 }
 416
 417 /*
 418  * Radio handlers
 419  */
 420 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 421 {
 422         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 423                                     REGISTER_TIMEOUT);
 424
 425         /*
 426          * The USB version of kill_tx_queue also works
 427          * on the RX queue.
 428          */
 429         rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev->rx);
 430 }
 431 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 432
 433 /*
 434  * Device initialization handlers.
 435  */
 436 void rt2x00usb_clear_entry(struct queue_entry *entry)
 437 {
 438         struct usb_device *usb_dev =
 439             to_usb_device_intf(entry->queue->rt2x00dev->dev);
 440         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 441         int pipe;
 442         int status;
 443
 444         entry->flags = 0;
 445
 446         if (entry->queue->qid == QID_RX) {
 447                 pipe = usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint);
 448                 usb_fill_bulk_urb(entry_priv->urb, usb_dev, pipe,
 449                                 entry->skb->data, entry->skb->len,
 450                                 rt2x00usb_interrupt_rxdone, entry);
 451
 452                 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 453
 454                 status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 455                 if (status) {
 456                         if (status == -ENODEV)
 457                                 clear_bit(DEVICE_STATE_PRESENT,
 458                                           &entry->queue->rt2x00dev->flags);
 459                         set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 460                         rt2x00lib_dmadone(entry);
 461                 }
 462         }
 463 }
 464 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 465
 466 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 467                                       struct usb_endpoint_descriptor *ep_desc)
 468 {
 469         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 470         int pipe;
 471
 472         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 473
 474         if (queue->qid == QID_RX) {
 475                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 476                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 477         } else {
 478                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 479                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 480         }
 481
 482         if (!queue->usb_maxpacket)
 483                 queue->usb_maxpacket = 1;
 484 }
 485
 486 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 487 {
 488         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 489         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 490         struct usb_endpoint_descriptor *ep_desc;
 491         struct data_queue *queue = rt2x00dev->tx;
 492         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 493         unsigned int i;
 494
 495         /*
 496          * Walk through all available endpoints to search for "bulk in"
 497          * and "bulk out" endpoints. When we find such endpoints collect
 498          * the information we need from the descriptor and assign it
 499          * to the queue.
 500          */
 501         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 502                 ep_desc = &intf_desc->endpoint[i].desc;
 503
 504                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 505                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 506                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 507                            (queue != queue_end(rt2x00dev))) {
 508                         rt2x00usb_assign_endpoint(queue, ep_desc);
 509                         queue = queue_next(queue);
 510
 511                         tx_ep_desc = ep_desc;
 512                 }
 513         }
 514
 515         /*
 516          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 517          */
 518         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 519                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 520                 return -EPIPE;
 521         }
 522
 523         /*
 524          * It might be possible not all queues have a dedicated endpoint.
 525          * Loop through all TX queues and copy the endpoint information
 526          * which we have gathered from already assigned endpoints.
 527          */
 528         txall_queue_for_each(rt2x00dev, queue) {
 529                 if (!queue->usb_endpoint)
 530                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 531         }
 532
 533         return 0;
 534 }
 535
 536 static int rt2x00usb_alloc_entries(struct data_queue *queue)
 537 {
 538         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 539         struct queue_entry_priv_usb *entry_priv;
 540         struct queue_entry_priv_usb_bcn *bcn_priv;
 541         unsigned int i;
 542
 543         for (i = 0; i < queue->limit; i++) {
 544                 entry_priv = queue->entries[i].priv_data;
 545                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 546                 if (!entry_priv->urb)
 547                         return -ENOMEM;
 548         }
 549
 550         /*
 551          * If this is not the beacon queue or
 552          * no guardian byte was required for the beacon,
 553          * then we are done.
 554          */
 555         if (queue->qid != QID_BEACON ||
 556             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 557                 return 0;
 558
 559         for (i = 0; i < queue->limit; i++) {
 560                 bcn_priv = queue->entries[i].priv_data;
 561                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 562                 if (!bcn_priv->guardian_urb)
 563                         return -ENOMEM;
 564         }
 565
 566         return 0;
 567 }
 568
 569 static void rt2x00usb_free_entries(struct data_queue *queue)
 570 {
 571         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 572         struct queue_entry_priv_usb *entry_priv;
 573         struct queue_entry_priv_usb_bcn *bcn_priv;
 574         unsigned int i;
 575
 576         if (!queue->entries)
 577                 return;
 578
 579         for (i = 0; i < queue->limit; i++) {
 580                 entry_priv = queue->entries[i].priv_data;
 581                 usb_kill_urb(entry_priv->urb);
 582                 usb_free_urb(entry_priv->urb);
 583         }
 584
 585         /*
 586          * If this is not the beacon queue or
 587          * no guardian byte was required for the beacon,
 588          * then we are done.
 589          */
 590         if (queue->qid != QID_BEACON ||
 591             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 592                 return;
 593
 594         for (i = 0; i < queue->limit; i++) {
 595                 bcn_priv = queue->entries[i].priv_data;
 596                 usb_kill_urb(bcn_priv->guardian_urb);
 597                 usb_free_urb(bcn_priv->guardian_urb);
 598         }
 599 }
 600
 601 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 602 {
 603         struct data_queue *queue;
 604         int status;
 605
 606         /*
 607          * Find endpoints for each queue
 608          */
 609         status = rt2x00usb_find_endpoints(rt2x00dev);
 610         if (status)
 611                 goto exit;
 612
 613         /*
 614          * Allocate DMA
 615          */
 616         queue_for_each(rt2x00dev, queue) {
 617                 status = rt2x00usb_alloc_entries(queue);
 618                 if (status)
 619                         goto exit;
 620         }
 621
 622         return 0;
 623
 624 exit:
 625         rt2x00usb_uninitialize(rt2x00dev);
 626
 627         return status;
 628 }
 629 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 630
 631 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 632 {
 633         struct data_queue *queue;
 634
 635         queue_for_each(rt2x00dev, queue)
 636                 rt2x00usb_free_entries(queue);
 637 }
 638 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 639
 640 /*
 641  * USB driver handlers.
 642  */
 643 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 644 {
 645         kfree(rt2x00dev->rf);
 646         rt2x00dev->rf = NULL;
 647
 648         kfree(rt2x00dev->eeprom);
 649         rt2x00dev->eeprom = NULL;
 650
 651         kfree(rt2x00dev->csr.cache);
 652         rt2x00dev->csr.cache = NULL;
 653 }
 654
 655 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 656 {
 657         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 658         if (!rt2x00dev->csr.cache)
 659                 goto exit;
 660
 661         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 662         if (!rt2x00dev->eeprom)
 663                 goto exit;
 664
 665         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 666         if (!rt2x00dev->rf)
 667                 goto exit;
 668
 669         return 0;
 670
 671 exit:
 672         ERROR_PROBE("Failed to allocate registers.\n");
 673
 674         rt2x00usb_free_reg(rt2x00dev);
 675
 676         return -ENOMEM;
 677 }
 678
 679 int rt2x00usb_probe(struct usb_interface *usb_intf,
 680                     const struct usb_device_id *id)
 681 {
 682         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 683         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 684         struct ieee80211_hw *hw;
 685         struct rt2x00_dev *rt2x00dev;
 686         int retval;
 687
 688         usb_dev = usb_get_dev(usb_dev);
 689
 690         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 691         if (!hw) {
 692                 ERROR_PROBE("Failed to allocate hardware.\n");
 693                 retval = -ENOMEM;
 694                 goto exit_put_device;
 695         }
 696
 697         usb_set_intfdata(usb_intf, hw);
 698
 699         rt2x00dev = hw->priv;
 700         rt2x00dev->dev = &usb_intf->dev;
 701         rt2x00dev->ops = ops;
 702         rt2x00dev->hw = hw;
 703
 704         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 705
 706         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 707         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 708
 709         retval = rt2x00usb_alloc_reg(rt2x00dev);
 710         if (retval)
 711                 goto exit_free_device;
 712
 713         retval = rt2x00lib_probe_dev(rt2x00dev);
 714         if (retval)
 715                 goto exit_free_reg;
 716
 717         return 0;
 718
 719 exit_free_reg:
 720         rt2x00usb_free_reg(rt2x00dev);
 721
 722 exit_free_device:
 723         ieee80211_free_hw(hw);
 724
 725 exit_put_device:
 726         usb_put_dev(usb_dev);
 727
 728         usb_set_intfdata(usb_intf, NULL);
 729
 730         return retval;
 731 }
 732 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 733
 734 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 735 {
 736         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 737         struct rt2x00_dev *rt2x00dev = hw->priv;
 738
 739         /*
 740          * Free all allocated data.
 741          */
 742         rt2x00lib_remove_dev(rt2x00dev);
 743         rt2x00usb_free_reg(rt2x00dev);
 744         ieee80211_free_hw(hw);
 745
 746         /*
 747          * Free the USB device data.
 748          */
 749         usb_set_intfdata(usb_intf, NULL);
 750         usb_put_dev(interface_to_usbdev(usb_intf));
 751 }
 752 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 753
 754 #ifdef CONFIG_PM
 755 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 756 {
 757         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 758         struct rt2x00_dev *rt2x00dev = hw->priv;
 759         int retval;
 760
 761         retval = rt2x00lib_suspend(rt2x00dev, state);
 762         if (retval)
 763                 return retval;
 764
 765         /*
 766          * Decrease usbdev refcount.
 767          */
 768         usb_put_dev(interface_to_usbdev(usb_intf));
 769
 770         return 0;
 771 }
 772 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 773
 774 int rt2x00usb_resume(struct usb_interface *usb_intf)
 775 {
 776         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 777         struct rt2x00_dev *rt2x00dev = hw->priv;
 778
 779         usb_get_dev(interface_to_usbdev(usb_intf));
 780
 781         return rt2x00lib_resume(rt2x00dev);
 782 }
 783 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 784 #endif /* CONFIG_PM */
 785
 786 /*
 787  * rt2x00usb module information.
 788  */
 789 MODULE_AUTHOR(DRV_PROJECT);
 790 MODULE_VERSION(DRV_VERSION);
 791 MODULE_DESCRIPTION("rt2x00 usb library");
 792 MODULE_LICENSE("GPL");