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 inline 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                 /*
 237                  * USB devices cannot blindly pass the skb->len as the
 238                  * length of the data to usb_fill_bulk_urb. Pass the skb
 239                  * to the driver to determine what the length should be.
 240                  */
 241                 length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 242
 243                 usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 244                                   usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 245                                   entry->skb->data, length,
 246                                   rt2x00usb_interrupt_txdone, entry);
 247
 248                 usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 249         }
 250 }
 251
 252 void rt2x00usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
 253                              const enum data_queue_qid qid)
 254 {
 255         struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, qid);
 256         unsigned long irqflags;
 257         unsigned int index;
 258         unsigned int index_done;
 259         unsigned int i;
 260
 261         /*
 262          * Only protect the range we are going to loop over,
 263          * if during our loop a extra entry is set to pending
 264          * it should not be kicked during this run, since it
 265          * is part of another TX operation.
 266          */
 267         spin_lock_irqsave(&queue->lock, irqflags);
 268         index = queue->index[Q_INDEX];
 269         index_done = queue->index[Q_INDEX_DONE];
 270         spin_unlock_irqrestore(&queue->lock, irqflags);
 271
 272         /*
 273          * Start from the TX done pointer, this guarentees that we will
 274          * send out all frames in the correct order.
 275          */
 276         if (index_done < index) {
 277                 for (i = index_done; i < index; i++)
 278                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 279         } else {
 280                 for (i = index_done; i < queue->limit; i++)
 281                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 282
 283                 for (i = 0; i < index; i++)
 284                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 285         }
 286 }
 287 EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue);
 288
 289 void rt2x00usb_kill_tx_queue(struct rt2x00_dev *rt2x00dev,
 290                              const enum data_queue_qid qid)
 291 {
 292         struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, qid);
 293         struct queue_entry_priv_usb *entry_priv;
 294         struct queue_entry_priv_usb_bcn *bcn_priv;
 295         unsigned int i;
 296         bool kill_guard;
 297
 298         /*
 299          * When killing the beacon queue, we must also kill
 300          * the beacon guard byte.
 301          */
 302         kill_guard =
 303             (qid == QID_BEACON) &&
 304             (test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags));
 305
 306         /*
 307          * Cancel all entries.
 308          */
 309         for (i = 0; i < queue->limit; i++) {
 310                 entry_priv = queue->entries[i].priv_data;
 311                 usb_kill_urb(entry_priv->urb);
 312
 313                 /*
 314                  * Kill guardian urb (if required by driver).
 315                  */
 316                 if (kill_guard) {
 317                         bcn_priv = queue->entries[i].priv_data;
 318                         usb_kill_urb(bcn_priv->guardian_urb);
 319                 }
 320         }
 321 }
 322 EXPORT_SYMBOL_GPL(rt2x00usb_kill_tx_queue);
 323
 324 static void rt2x00usb_watchdog_reset_tx(struct data_queue *queue)
 325 {
 326         struct queue_entry *entry;
 327         struct queue_entry_priv_usb *entry_priv;
 328         unsigned short threshold = queue->threshold;
 329
 330         WARNING(queue->rt2x00dev, "TX queue %d timed out, invoke reset", queue->qid);
 331
 332         /*
 333          * Temporarily disable the TX queue, this will force mac80211
 334          * to use the other queues until this queue has been restored.
 335          *
 336          * Set the queue threshold to the queue limit. This prevents the
 337          * queue from being enabled during the txdone handler.
 338          */
 339         queue->threshold = queue->limit;
 340         ieee80211_stop_queue(queue->rt2x00dev->hw, queue->qid);
 341
 342         /*
 343          * Reset all currently uploaded TX frames.
 344          */
 345         while (!rt2x00queue_empty(queue)) {
 346                 entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 347                 entry_priv = entry->priv_data;
 348                 usb_kill_urb(entry_priv->urb);
 349
 350                 /*
 351                  * We need a short delay here to wait for
 352                  * the URB to be canceled
 353                  */
 354                 do {
 355                         udelay(100);
 356                 } while (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags));
 357
 358                 /*
 359                  * Invoke the TX done handler
 360                  */
 361                 rt2x00usb_work_txdone_entry(entry);
 362         }
 363
 364         /*
 365          * The queue has been reset, and mac80211 is allowed to use the
 366          * queue again.
 367          */
 368         queue->threshold = threshold;
 369         ieee80211_wake_queue(queue->rt2x00dev->hw, queue->qid);
 370 }
 371
 372 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 373 {
 374         struct data_queue *queue;
 375
 376         tx_queue_for_each(rt2x00dev, queue) {
 377                 if (rt2x00queue_timeout(queue))
 378                         rt2x00usb_watchdog_reset_tx(queue);
 379         }
 380 }
 381 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 382
 383 /*
 384  * RX data handlers.
 385  */
 386 static void rt2x00usb_work_rxdone(struct work_struct *work)
 387 {
 388         struct rt2x00_dev *rt2x00dev =
 389             container_of(work, struct rt2x00_dev, rxdone_work);
 390         struct queue_entry *entry;
 391         struct skb_frame_desc *skbdesc;
 392         u8 rxd[32];
 393
 394         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 395                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 396
 397                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 398                         break;
 399
 400                 /*
 401                  * Fill in desc fields of the skb descriptor
 402                  */
 403                 skbdesc = get_skb_frame_desc(entry->skb);
 404                 skbdesc->desc = rxd;
 405                 skbdesc->desc_len = entry->queue->desc_size;
 406
 407                 /*
 408                  * Send the frame to rt2x00lib for further processing.
 409                  */
 410                 rt2x00lib_rxdone(rt2x00dev, entry);
 411         }
 412 }
 413
 414 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 415 {
 416         struct queue_entry *entry = (struct queue_entry *)urb->context;
 417         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 418
 419         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags) ||
 420             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 421                 return;
 422
 423         /*
 424          * Check if the received data is simply too small
 425          * to be actually valid, or if the urb is signaling
 426          * a problem.
 427          */
 428         if (urb->actual_length < entry->queue->desc_size || urb->status)
 429                 __set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 430
 431         /*
 432          * Schedule the delayed work for reading the RX status
 433          * from the device.
 434          */
 435         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->rxdone_work);
 436 }
 437
 438 /*
 439  * Radio handlers
 440  */
 441 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 442 {
 443         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 444                                     REGISTER_TIMEOUT);
 445
 446         /*
 447          * The USB version of kill_tx_queue also works
 448          * on the RX queue.
 449          */
 450         rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev, QID_RX);
 451 }
 452 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 453
 454 /*
 455  * Device initialization handlers.
 456  */
 457 void rt2x00usb_clear_entry(struct queue_entry *entry)
 458 {
 459         struct usb_device *usb_dev =
 460             to_usb_device_intf(entry->queue->rt2x00dev->dev);
 461         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 462         int pipe;
 463
 464         entry->flags = 0;
 465
 466         if (entry->queue->qid == QID_RX) {
 467                 pipe = usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint);
 468                 usb_fill_bulk_urb(entry_priv->urb, usb_dev, pipe,
 469                                 entry->skb->data, entry->skb->len,
 470                                 rt2x00usb_interrupt_rxdone, entry);
 471
 472                 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 473                 usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 474         }
 475 }
 476 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 477
 478 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 479                                       struct usb_endpoint_descriptor *ep_desc)
 480 {
 481         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 482         int pipe;
 483
 484         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 485
 486         if (queue->qid == QID_RX) {
 487                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 488                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 489         } else {
 490                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 491                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 492         }
 493
 494         if (!queue->usb_maxpacket)
 495                 queue->usb_maxpacket = 1;
 496 }
 497
 498 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 499 {
 500         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 501         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 502         struct usb_endpoint_descriptor *ep_desc;
 503         struct data_queue *queue = rt2x00dev->tx;
 504         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 505         unsigned int i;
 506
 507         /*
 508          * Walk through all available endpoints to search for "bulk in"
 509          * and "bulk out" endpoints. When we find such endpoints collect
 510          * the information we need from the descriptor and assign it
 511          * to the queue.
 512          */
 513         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 514                 ep_desc = &intf_desc->endpoint[i].desc;
 515
 516                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 517                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 518                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 519                            (queue != queue_end(rt2x00dev))) {
 520                         rt2x00usb_assign_endpoint(queue, ep_desc);
 521                         queue = queue_next(queue);
 522
 523                         tx_ep_desc = ep_desc;
 524                 }
 525         }
 526
 527         /*
 528          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 529          */
 530         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 531                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 532                 return -EPIPE;
 533         }
 534
 535         /*
 536          * It might be possible not all queues have a dedicated endpoint.
 537          * Loop through all TX queues and copy the endpoint information
 538          * which we have gathered from already assigned endpoints.
 539          */
 540         txall_queue_for_each(rt2x00dev, queue) {
 541                 if (!queue->usb_endpoint)
 542                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 543         }
 544
 545         return 0;
 546 }
 547
 548 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 549                                struct data_queue *queue)
 550 {
 551         struct queue_entry_priv_usb *entry_priv;
 552         struct queue_entry_priv_usb_bcn *bcn_priv;
 553         unsigned int i;
 554
 555         for (i = 0; i < queue->limit; i++) {
 556                 entry_priv = queue->entries[i].priv_data;
 557                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 558                 if (!entry_priv->urb)
 559                         return -ENOMEM;
 560         }
 561
 562         /*
 563          * If this is not the beacon queue or
 564          * no guardian byte was required for the beacon,
 565          * then we are done.
 566          */
 567         if (rt2x00dev->bcn != queue ||
 568             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 569                 return 0;
 570
 571         for (i = 0; i < queue->limit; i++) {
 572                 bcn_priv = queue->entries[i].priv_data;
 573                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 574                 if (!bcn_priv->guardian_urb)
 575                         return -ENOMEM;
 576         }
 577
 578         return 0;
 579 }
 580
 581 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 582                                struct data_queue *queue)
 583 {
 584         struct queue_entry_priv_usb *entry_priv;
 585         struct queue_entry_priv_usb_bcn *bcn_priv;
 586         unsigned int i;
 587
 588         if (!queue->entries)
 589                 return;
 590
 591         for (i = 0; i < queue->limit; i++) {
 592                 entry_priv = queue->entries[i].priv_data;
 593                 usb_kill_urb(entry_priv->urb);
 594                 usb_free_urb(entry_priv->urb);
 595         }
 596
 597         /*
 598          * If this is not the beacon queue or
 599          * no guardian byte was required for the beacon,
 600          * then we are done.
 601          */
 602         if (rt2x00dev->bcn != queue ||
 603             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 604                 return;
 605
 606         for (i = 0; i < queue->limit; i++) {
 607                 bcn_priv = queue->entries[i].priv_data;
 608                 usb_kill_urb(bcn_priv->guardian_urb);
 609                 usb_free_urb(bcn_priv->guardian_urb);
 610         }
 611 }
 612
 613 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 614 {
 615         struct data_queue *queue;
 616         int status;
 617
 618         /*
 619          * Find endpoints for each queue
 620          */
 621         status = rt2x00usb_find_endpoints(rt2x00dev);
 622         if (status)
 623                 goto exit;
 624
 625         /*
 626          * Allocate DMA
 627          */
 628         queue_for_each(rt2x00dev, queue) {
 629                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
 630                 if (status)
 631                         goto exit;
 632         }
 633
 634         return 0;
 635
 636 exit:
 637         rt2x00usb_uninitialize(rt2x00dev);
 638
 639         return status;
 640 }
 641 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 642
 643 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 644 {
 645         struct data_queue *queue;
 646
 647         queue_for_each(rt2x00dev, queue)
 648                 rt2x00usb_free_urb(rt2x00dev, queue);
 649 }
 650 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 651
 652 /*
 653  * USB driver handlers.
 654  */
 655 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 656 {
 657         kfree(rt2x00dev->rf);
 658         rt2x00dev->rf = NULL;
 659
 660         kfree(rt2x00dev->eeprom);
 661         rt2x00dev->eeprom = NULL;
 662
 663         kfree(rt2x00dev->csr.cache);
 664         rt2x00dev->csr.cache = NULL;
 665 }
 666
 667 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 668 {
 669         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 670         if (!rt2x00dev->csr.cache)
 671                 goto exit;
 672
 673         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 674         if (!rt2x00dev->eeprom)
 675                 goto exit;
 676
 677         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 678         if (!rt2x00dev->rf)
 679                 goto exit;
 680
 681         return 0;
 682
 683 exit:
 684         ERROR_PROBE("Failed to allocate registers.\n");
 685
 686         rt2x00usb_free_reg(rt2x00dev);
 687
 688         return -ENOMEM;
 689 }
 690
 691 int rt2x00usb_probe(struct usb_interface *usb_intf,
 692                     const struct usb_device_id *id)
 693 {
 694         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 695         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 696         struct ieee80211_hw *hw;
 697         struct rt2x00_dev *rt2x00dev;
 698         int retval;
 699
 700         usb_dev = usb_get_dev(usb_dev);
 701
 702         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 703         if (!hw) {
 704                 ERROR_PROBE("Failed to allocate hardware.\n");
 705                 retval = -ENOMEM;
 706                 goto exit_put_device;
 707         }
 708
 709         usb_set_intfdata(usb_intf, hw);
 710
 711         rt2x00dev = hw->priv;
 712         rt2x00dev->dev = &usb_intf->dev;
 713         rt2x00dev->ops = ops;
 714         rt2x00dev->hw = hw;
 715
 716         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 717
 718         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 719         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 720
 721         retval = rt2x00usb_alloc_reg(rt2x00dev);
 722         if (retval)
 723                 goto exit_free_device;
 724
 725         retval = rt2x00lib_probe_dev(rt2x00dev);
 726         if (retval)
 727                 goto exit_free_reg;
 728
 729         return 0;
 730
 731 exit_free_reg:
 732         rt2x00usb_free_reg(rt2x00dev);
 733
 734 exit_free_device:
 735         ieee80211_free_hw(hw);
 736
 737 exit_put_device:
 738         usb_put_dev(usb_dev);
 739
 740         usb_set_intfdata(usb_intf, NULL);
 741
 742         return retval;
 743 }
 744 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 745
 746 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 747 {
 748         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 749         struct rt2x00_dev *rt2x00dev = hw->priv;
 750
 751         /*
 752          * Free all allocated data.
 753          */
 754         rt2x00lib_remove_dev(rt2x00dev);
 755         rt2x00usb_free_reg(rt2x00dev);
 756         ieee80211_free_hw(hw);
 757
 758         /*
 759          * Free the USB device data.
 760          */
 761         usb_set_intfdata(usb_intf, NULL);
 762         usb_put_dev(interface_to_usbdev(usb_intf));
 763 }
 764 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 765
 766 #ifdef CONFIG_PM
 767 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 768 {
 769         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 770         struct rt2x00_dev *rt2x00dev = hw->priv;
 771         int retval;
 772
 773         retval = rt2x00lib_suspend(rt2x00dev, state);
 774         if (retval)
 775                 return retval;
 776
 777         /*
 778          * Decrease usbdev refcount.
 779          */
 780         usb_put_dev(interface_to_usbdev(usb_intf));
 781
 782         return 0;
 783 }
 784 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 785
 786 int rt2x00usb_resume(struct usb_interface *usb_intf)
 787 {
 788         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 789         struct rt2x00_dev *rt2x00dev = hw->priv;
 790
 791         usb_get_dev(interface_to_usbdev(usb_intf));
 792
 793         return rt2x00lib_resume(rt2x00dev);
 794 }
 795 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 796 #endif /* CONFIG_PM */
 797
 798 /*
 799  * rt2x00usb module information.
 800  */
 801 MODULE_AUTHOR(DRV_PROJECT);
 802 MODULE_VERSION(DRV_VERSION);
 803 MODULE_DESCRIPTION("rt2x00 usb library");
 804 MODULE_LICENSE("GPL");