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
 239         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags))
 240                 return;
 241
 242         /*
 243          * USB devices cannot blindly pass the skb->len as the
 244          * length of the data to usb_fill_bulk_urb. Pass the skb
 245          * to the driver to determine what the length should be.
 246          */
 247         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 248
 249         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 250                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 251                           entry->skb->data, length,
 252                           rt2x00usb_interrupt_txdone, entry);
 253
 254         if (usb_submit_urb(entry_priv->urb, GFP_ATOMIC)) {
 255                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 256                 rt2x00lib_dmadone(entry);
 257         }
 258 }
 259
 260 void rt2x00usb_kick_tx_queue(struct data_queue *queue)
 261 {
 262         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 263                                    rt2x00usb_kick_tx_entry);
 264 }
 265 EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue);
 266
 267 static void rt2x00usb_kill_tx_entry(struct queue_entry *entry)
 268 {
 269         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 270         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 271         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
 272
 273         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 274                 return;
 275
 276         usb_kill_urb(entry_priv->urb);
 277
 278         /*
 279          * Kill guardian urb (if required by driver).
 280          */
 281         if ((entry->queue->qid == QID_BEACON) &&
 282             (test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags)))
 283                 usb_kill_urb(bcn_priv->guardian_urb);
 284 }
 285
 286 void rt2x00usb_kill_tx_queue(struct data_queue *queue)
 287 {
 288         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 289                                    rt2x00usb_kill_tx_entry);
 290 }
 291 EXPORT_SYMBOL_GPL(rt2x00usb_kill_tx_queue);
 292
 293 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
 294 {
 295         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 296         unsigned short threshold = queue->threshold;
 297
 298         WARNING(queue->rt2x00dev, "TX queue %d DMA timed out,"
 299                 " invoke forced forced reset", queue->qid);
 300
 301         /*
 302          * Temporarily disable the TX queue, this will force mac80211
 303          * to use the other queues until this queue has been restored.
 304          *
 305          * Set the queue threshold to the queue limit. This prevents the
 306          * queue from being enabled during the txdone handler.
 307          */
 308         queue->threshold = queue->limit;
 309         ieee80211_stop_queue(rt2x00dev->hw, queue->qid);
 310
 311         /*
 312          * Kill all entries in the queue, afterwards we need to
 313          * wait a bit for all URBs to be cancelled.
 314          */
 315         rt2x00usb_kill_tx_queue(queue);
 316
 317         /*
 318          * In case that a driver has overriden the txdone_work
 319          * function, we invoke the TX done through there.
 320          */
 321         rt2x00dev->txdone_work.func(&rt2x00dev->txdone_work);
 322
 323         /*
 324          * The queue has been reset, and mac80211 is allowed to use the
 325          * queue again.
 326          */
 327         queue->threshold = threshold;
 328         ieee80211_wake_queue(rt2x00dev->hw, queue->qid);
 329 }
 330
 331 static void rt2x00usb_watchdog_tx_status(struct data_queue *queue)
 332 {
 333         WARNING(queue->rt2x00dev, "TX queue %d status timed out,"
 334                 " invoke forced tx handler", queue->qid);
 335
 336         ieee80211_queue_work(queue->rt2x00dev->hw, &queue->rt2x00dev->txdone_work);
 337 }
 338
 339 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 340 {
 341         struct data_queue *queue;
 342
 343         tx_queue_for_each(rt2x00dev, queue) {
 344                 if (!rt2x00queue_empty(queue)) {
 345                         if (rt2x00queue_dma_timeout(queue))
 346                                 rt2x00usb_watchdog_tx_dma(queue);
 347                         if (rt2x00queue_status_timeout(queue))
 348                                 rt2x00usb_watchdog_tx_status(queue);
 349                 }
 350         }
 351 }
 352 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 353
 354 /*
 355  * RX data handlers.
 356  */
 357 static void rt2x00usb_work_rxdone(struct work_struct *work)
 358 {
 359         struct rt2x00_dev *rt2x00dev =
 360             container_of(work, struct rt2x00_dev, rxdone_work);
 361         struct queue_entry *entry;
 362         struct skb_frame_desc *skbdesc;
 363         u8 rxd[32];
 364
 365         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 366                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 367
 368                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 369                         break;
 370
 371                 /*
 372                  * Fill in desc fields of the skb descriptor
 373                  */
 374                 skbdesc = get_skb_frame_desc(entry->skb);
 375                 skbdesc->desc = rxd;
 376                 skbdesc->desc_len = entry->queue->desc_size;
 377
 378                 /*
 379                  * Send the frame to rt2x00lib for further processing.
 380                  */
 381                 rt2x00lib_rxdone(entry);
 382         }
 383 }
 384
 385 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 386 {
 387         struct queue_entry *entry = (struct queue_entry *)urb->context;
 388         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 389
 390         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 391                 return;
 392
 393         /*
 394          * Report the frame as DMA done
 395          */
 396         rt2x00lib_dmadone(entry);
 397
 398         /*
 399          * Check if the received data is simply too small
 400          * to be actually valid, or if the urb is signaling
 401          * a problem.
 402          */
 403         if (urb->actual_length < entry->queue->desc_size || urb->status)
 404                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 405
 406         /*
 407          * Schedule the delayed work for reading the RX status
 408          * from the device.
 409          */
 410         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->rxdone_work);
 411 }
 412
 413 /*
 414  * Radio handlers
 415  */
 416 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 417 {
 418         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 419                                     REGISTER_TIMEOUT);
 420
 421         /*
 422          * The USB version of kill_tx_queue also works
 423          * on the RX queue.
 424          */
 425         rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev->rx);
 426 }
 427 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 428
 429 /*
 430  * Device initialization handlers.
 431  */
 432 void rt2x00usb_clear_entry(struct queue_entry *entry)
 433 {
 434         struct usb_device *usb_dev =
 435             to_usb_device_intf(entry->queue->rt2x00dev->dev);
 436         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 437         int pipe;
 438
 439         entry->flags = 0;
 440
 441         if (entry->queue->qid == QID_RX) {
 442                 pipe = usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint);
 443                 usb_fill_bulk_urb(entry_priv->urb, usb_dev, pipe,
 444                                 entry->skb->data, entry->skb->len,
 445                                 rt2x00usb_interrupt_rxdone, entry);
 446
 447                 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 448                 if (usb_submit_urb(entry_priv->urb, GFP_ATOMIC)) {
 449                         set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 450                         rt2x00lib_dmadone(entry);
 451                 }
 452         }
 453 }
 454 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 455
 456 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 457                                       struct usb_endpoint_descriptor *ep_desc)
 458 {
 459         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 460         int pipe;
 461
 462         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 463
 464         if (queue->qid == QID_RX) {
 465                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 466                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 467         } else {
 468                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 469                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 470         }
 471
 472         if (!queue->usb_maxpacket)
 473                 queue->usb_maxpacket = 1;
 474 }
 475
 476 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 477 {
 478         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 479         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 480         struct usb_endpoint_descriptor *ep_desc;
 481         struct data_queue *queue = rt2x00dev->tx;
 482         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 483         unsigned int i;
 484
 485         /*
 486          * Walk through all available endpoints to search for "bulk in"
 487          * and "bulk out" endpoints. When we find such endpoints collect
 488          * the information we need from the descriptor and assign it
 489          * to the queue.
 490          */
 491         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 492                 ep_desc = &intf_desc->endpoint[i].desc;
 493
 494                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 495                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 496                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 497                            (queue != queue_end(rt2x00dev))) {
 498                         rt2x00usb_assign_endpoint(queue, ep_desc);
 499                         queue = queue_next(queue);
 500
 501                         tx_ep_desc = ep_desc;
 502                 }
 503         }
 504
 505         /*
 506          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 507          */
 508         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 509                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 510                 return -EPIPE;
 511         }
 512
 513         /*
 514          * It might be possible not all queues have a dedicated endpoint.
 515          * Loop through all TX queues and copy the endpoint information
 516          * which we have gathered from already assigned endpoints.
 517          */
 518         txall_queue_for_each(rt2x00dev, queue) {
 519                 if (!queue->usb_endpoint)
 520                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 521         }
 522
 523         return 0;
 524 }
 525
 526 static int rt2x00usb_alloc_entries(struct data_queue *queue)
 527 {
 528         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 529         struct queue_entry_priv_usb *entry_priv;
 530         struct queue_entry_priv_usb_bcn *bcn_priv;
 531         unsigned int i;
 532
 533         for (i = 0; i < queue->limit; i++) {
 534                 entry_priv = queue->entries[i].priv_data;
 535                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 536                 if (!entry_priv->urb)
 537                         return -ENOMEM;
 538         }
 539
 540         /*
 541          * If this is not the beacon queue or
 542          * no guardian byte was required for the beacon,
 543          * then we are done.
 544          */
 545         if (queue->qid != QID_BEACON ||
 546             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 547                 return 0;
 548
 549         for (i = 0; i < queue->limit; i++) {
 550                 bcn_priv = queue->entries[i].priv_data;
 551                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 552                 if (!bcn_priv->guardian_urb)
 553                         return -ENOMEM;
 554         }
 555
 556         return 0;
 557 }
 558
 559 static void rt2x00usb_free_entries(struct data_queue *queue)
 560 {
 561         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 562         struct queue_entry_priv_usb *entry_priv;
 563         struct queue_entry_priv_usb_bcn *bcn_priv;
 564         unsigned int i;
 565
 566         if (!queue->entries)
 567                 return;
 568
 569         for (i = 0; i < queue->limit; i++) {
 570                 entry_priv = queue->entries[i].priv_data;
 571                 usb_kill_urb(entry_priv->urb);
 572                 usb_free_urb(entry_priv->urb);
 573         }
 574
 575         /*
 576          * If this is not the beacon queue or
 577          * no guardian byte was required for the beacon,
 578          * then we are done.
 579          */
 580         if (queue->qid != QID_BEACON ||
 581             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 582                 return;
 583
 584         for (i = 0; i < queue->limit; i++) {
 585                 bcn_priv = queue->entries[i].priv_data;
 586                 usb_kill_urb(bcn_priv->guardian_urb);
 587                 usb_free_urb(bcn_priv->guardian_urb);
 588         }
 589 }
 590
 591 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 592 {
 593         struct data_queue *queue;
 594         int status;
 595
 596         /*
 597          * Find endpoints for each queue
 598          */
 599         status = rt2x00usb_find_endpoints(rt2x00dev);
 600         if (status)
 601                 goto exit;
 602
 603         /*
 604          * Allocate DMA
 605          */
 606         queue_for_each(rt2x00dev, queue) {
 607                 status = rt2x00usb_alloc_entries(queue);
 608                 if (status)
 609                         goto exit;
 610         }
 611
 612         return 0;
 613
 614 exit:
 615         rt2x00usb_uninitialize(rt2x00dev);
 616
 617         return status;
 618 }
 619 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 620
 621 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 622 {
 623         struct data_queue *queue;
 624
 625         queue_for_each(rt2x00dev, queue)
 626                 rt2x00usb_free_entries(queue);
 627 }
 628 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 629
 630 /*
 631  * USB driver handlers.
 632  */
 633 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 634 {
 635         kfree(rt2x00dev->rf);
 636         rt2x00dev->rf = NULL;
 637
 638         kfree(rt2x00dev->eeprom);
 639         rt2x00dev->eeprom = NULL;
 640
 641         kfree(rt2x00dev->csr.cache);
 642         rt2x00dev->csr.cache = NULL;
 643 }
 644
 645 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 646 {
 647         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 648         if (!rt2x00dev->csr.cache)
 649                 goto exit;
 650
 651         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 652         if (!rt2x00dev->eeprom)
 653                 goto exit;
 654
 655         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 656         if (!rt2x00dev->rf)
 657                 goto exit;
 658
 659         return 0;
 660
 661 exit:
 662         ERROR_PROBE("Failed to allocate registers.\n");
 663
 664         rt2x00usb_free_reg(rt2x00dev);
 665
 666         return -ENOMEM;
 667 }
 668
 669 int rt2x00usb_probe(struct usb_interface *usb_intf,
 670                     const struct usb_device_id *id)
 671 {
 672         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 673         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 674         struct ieee80211_hw *hw;
 675         struct rt2x00_dev *rt2x00dev;
 676         int retval;
 677
 678         usb_dev = usb_get_dev(usb_dev);
 679
 680         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 681         if (!hw) {
 682                 ERROR_PROBE("Failed to allocate hardware.\n");
 683                 retval = -ENOMEM;
 684                 goto exit_put_device;
 685         }
 686
 687         usb_set_intfdata(usb_intf, hw);
 688
 689         rt2x00dev = hw->priv;
 690         rt2x00dev->dev = &usb_intf->dev;
 691         rt2x00dev->ops = ops;
 692         rt2x00dev->hw = hw;
 693
 694         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 695
 696         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 697         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 698
 699         retval = rt2x00usb_alloc_reg(rt2x00dev);
 700         if (retval)
 701                 goto exit_free_device;
 702
 703         retval = rt2x00lib_probe_dev(rt2x00dev);
 704         if (retval)
 705                 goto exit_free_reg;
 706
 707         return 0;
 708
 709 exit_free_reg:
 710         rt2x00usb_free_reg(rt2x00dev);
 711
 712 exit_free_device:
 713         ieee80211_free_hw(hw);
 714
 715 exit_put_device:
 716         usb_put_dev(usb_dev);
 717
 718         usb_set_intfdata(usb_intf, NULL);
 719
 720         return retval;
 721 }
 722 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 723
 724 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 725 {
 726         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 727         struct rt2x00_dev *rt2x00dev = hw->priv;
 728
 729         /*
 730          * Free all allocated data.
 731          */
 732         rt2x00lib_remove_dev(rt2x00dev);
 733         rt2x00usb_free_reg(rt2x00dev);
 734         ieee80211_free_hw(hw);
 735
 736         /*
 737          * Free the USB device data.
 738          */
 739         usb_set_intfdata(usb_intf, NULL);
 740         usb_put_dev(interface_to_usbdev(usb_intf));
 741 }
 742 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 743
 744 #ifdef CONFIG_PM
 745 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 746 {
 747         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 748         struct rt2x00_dev *rt2x00dev = hw->priv;
 749         int retval;
 750
 751         retval = rt2x00lib_suspend(rt2x00dev, state);
 752         if (retval)
 753                 return retval;
 754
 755         /*
 756          * Decrease usbdev refcount.
 757          */
 758         usb_put_dev(interface_to_usbdev(usb_intf));
 759
 760         return 0;
 761 }
 762 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 763
 764 int rt2x00usb_resume(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         usb_get_dev(interface_to_usbdev(usb_intf));
 770
 771         return rt2x00lib_resume(rt2x00dev);
 772 }
 773 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 774 #endif /* CONFIG_PM */
 775
 776 /*
 777  * rt2x00usb module information.
 778  */
 779 MODULE_AUTHOR(DRV_PROJECT);
 780 MODULE_VERSION(DRV_VERSION);
 781 MODULE_DESCRIPTION("rt2x00 usb library");
 782 MODULE_LICENSE("GPL");