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 struct rt2x00_async_read_data {
 170         __le32 reg;
 171         struct usb_ctrlrequest cr;
 172         struct rt2x00_dev *rt2x00dev;
 173         bool (*callback)(struct rt2x00_dev *, int, u32);
 174 };
 175
 176 static void rt2x00usb_register_read_async_cb(struct urb *urb)
 177 {
 178         struct rt2x00_async_read_data *rd = urb->context;
 179         if (rd->callback(rd->rt2x00dev, urb->status, le32_to_cpu(rd->reg))) {
 180                 if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
 181                         kfree(rd);
 182         } else
 183                 kfree(rd);
 184 }
 185
 186 void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev,
 187                                    const unsigned int offset,
 188                                    bool (*callback)(struct rt2x00_dev*, int, u32))
 189 {
 190         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 191         struct urb *urb;
 192         struct rt2x00_async_read_data *rd;
 193
 194         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 195         if (!rd)
 196                 return;
 197
 198         urb = usb_alloc_urb(0, GFP_ATOMIC);
 199         if (!urb) {
 200                 kfree(rd);
 201                 return;
 202         }
 203
 204         rd->rt2x00dev = rt2x00dev;
 205         rd->callback = callback;
 206         rd->cr.bRequestType = USB_VENDOR_REQUEST_IN;
 207         rd->cr.bRequest = USB_MULTI_READ;
 208         rd->cr.wValue = 0;
 209         rd->cr.wIndex = cpu_to_le16(offset);
 210         rd->cr.wLength = cpu_to_le16(sizeof(u32));
 211
 212         usb_fill_control_urb(urb, usb_dev, usb_rcvctrlpipe(usb_dev, 0),
 213                              (unsigned char *)(&rd->cr), &rd->reg, sizeof(rd->reg),
 214                              rt2x00usb_register_read_async_cb, rd);
 215         if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
 216                 kfree(rd);
 217         usb_free_urb(urb);
 218 }
 219 EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async);
 220
 221 /*
 222  * TX data handlers.
 223  */
 224 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
 225 {
 226         /*
 227          * If the transfer to hardware succeeded, it does not mean the
 228          * frame was send out correctly. It only means the frame
 229          * was successfully pushed to the hardware, we have no
 230          * way to determine the transmission status right now.
 231          * (Only indirectly by looking at the failed TX counters
 232          * in the register).
 233          */
 234         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 235                 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
 236         else
 237                 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
 238 }
 239
 240 static void rt2x00usb_work_txdone(struct work_struct *work)
 241 {
 242         struct rt2x00_dev *rt2x00dev =
 243             container_of(work, struct rt2x00_dev, txdone_work);
 244         struct data_queue *queue;
 245         struct queue_entry *entry;
 246
 247         tx_queue_for_each(rt2x00dev, queue) {
 248                 while (!rt2x00queue_empty(queue)) {
 249                         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 250
 251                         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 252                             !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 253                                 break;
 254
 255                         rt2x00usb_work_txdone_entry(entry);
 256                 }
 257         }
 258 }
 259
 260 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 261 {
 262         struct queue_entry *entry = (struct queue_entry *)urb->context;
 263         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 264
 265         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 266                 return;
 267         /*
 268          * Check if the frame was correctly uploaded
 269          */
 270         if (urb->status)
 271                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 272         /*
 273          * Report the frame as DMA done
 274          */
 275         rt2x00lib_dmadone(entry);
 276
 277         if (rt2x00dev->ops->lib->tx_dma_done)
 278                 rt2x00dev->ops->lib->tx_dma_done(entry);
 279         /*
 280          * Schedule the delayed work for reading the TX status
 281          * from the device.
 282          */
 283         if (!test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags) ||
 284             !kfifo_is_empty(&rt2x00dev->txstatus_fifo))
 285                 queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
 286 }
 287
 288 static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void* data)
 289 {
 290         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 291         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 292         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 293         u32 length;
 294         int status;
 295
 296         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
 297             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 298                 return false;
 299
 300         /*
 301          * USB devices require certain padding at the end of each frame
 302          * and urb. Those paddings are not included in skbs. Pass entry
 303          * to the driver to determine what the overall length should be.
 304          */
 305         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 306
 307         status = skb_padto(entry->skb, length);
 308         if (unlikely(status)) {
 309                 /* TODO: report something more appropriate than IO_FAILED. */
 310                 WARNING(rt2x00dev, "TX SKB padding error, out of memory\n");
 311                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 312                 rt2x00lib_dmadone(entry);
 313
 314                 return false;
 315         }
 316
 317         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 318                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 319                           entry->skb->data, length,
 320                           rt2x00usb_interrupt_txdone, entry);
 321
 322         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 323         if (status) {
 324                 if (status == -ENODEV)
 325                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 326                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 327                 rt2x00lib_dmadone(entry);
 328         }
 329
 330         return false;
 331 }
 332
 333 /*
 334  * RX data handlers.
 335  */
 336 static void rt2x00usb_work_rxdone(struct work_struct *work)
 337 {
 338         struct rt2x00_dev *rt2x00dev =
 339             container_of(work, struct rt2x00_dev, rxdone_work);
 340         struct queue_entry *entry;
 341         struct skb_frame_desc *skbdesc;
 342         u8 rxd[32];
 343
 344         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 345                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 346
 347                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 348                     !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 349                         break;
 350
 351                 /*
 352                  * Fill in desc fields of the skb descriptor
 353                  */
 354                 skbdesc = get_skb_frame_desc(entry->skb);
 355                 skbdesc->desc = rxd;
 356                 skbdesc->desc_len = entry->queue->desc_size;
 357
 358                 /*
 359                  * Send the frame to rt2x00lib for further processing.
 360                  */
 361                 rt2x00lib_rxdone(entry);
 362         }
 363 }
 364
 365 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 366 {
 367         struct queue_entry *entry = (struct queue_entry *)urb->context;
 368         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 369
 370         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 371                 return;
 372
 373         /*
 374          * Report the frame as DMA done
 375          */
 376         rt2x00lib_dmadone(entry);
 377
 378         /*
 379          * Check if the received data is simply too small
 380          * to be actually valid, or if the urb is signaling
 381          * a problem.
 382          */
 383         if (urb->actual_length < entry->queue->desc_size || urb->status)
 384                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 385
 386         /*
 387          * Schedule the delayed work for reading the RX status
 388          * from the device.
 389          */
 390         queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
 391 }
 392
 393 static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void* data)
 394 {
 395         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 396         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 397         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 398         int status;
 399
 400         if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 401             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 402                 return false;
 403
 404         rt2x00lib_dmastart(entry);
 405
 406         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 407                           usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
 408                           entry->skb->data, entry->skb->len,
 409                           rt2x00usb_interrupt_rxdone, entry);
 410
 411         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 412         if (status) {
 413                 if (status == -ENODEV)
 414                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 415                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 416                 rt2x00lib_dmadone(entry);
 417         }
 418
 419         return false;
 420 }
 421
 422 void rt2x00usb_kick_queue(struct data_queue *queue)
 423 {
 424         switch (queue->qid) {
 425         case QID_AC_VO:
 426         case QID_AC_VI:
 427         case QID_AC_BE:
 428         case QID_AC_BK:
 429                 if (!rt2x00queue_empty(queue))
 430                         rt2x00queue_for_each_entry(queue,
 431                                                    Q_INDEX_DONE,
 432                                                    Q_INDEX,
 433                                                    NULL,
 434                                                    rt2x00usb_kick_tx_entry);
 435                 break;
 436         case QID_RX:
 437                 if (!rt2x00queue_full(queue))
 438                         rt2x00queue_for_each_entry(queue,
 439                                                    Q_INDEX_DONE,
 440                                                    Q_INDEX,
 441                                                    NULL,
 442                                                    rt2x00usb_kick_rx_entry);
 443                 break;
 444         default:
 445                 break;
 446         }
 447 }
 448 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
 449
 450 static bool rt2x00usb_flush_entry(struct queue_entry *entry, void* data)
 451 {
 452         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 453         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 454         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
 455
 456         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 457                 return false;
 458
 459         usb_kill_urb(entry_priv->urb);
 460
 461         /*
 462          * Kill guardian urb (if required by driver).
 463          */
 464         if ((entry->queue->qid == QID_BEACON) &&
 465             (test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags)))
 466                 usb_kill_urb(bcn_priv->guardian_urb);
 467
 468         return false;
 469 }
 470
 471 void rt2x00usb_flush_queue(struct data_queue *queue, bool drop)
 472 {
 473         struct work_struct *completion;
 474         unsigned int i;
 475
 476         if (drop)
 477                 rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL,
 478                                            rt2x00usb_flush_entry);
 479
 480         /*
 481          * Obtain the queue completion handler
 482          */
 483         switch (queue->qid) {
 484         case QID_AC_VO:
 485         case QID_AC_VI:
 486         case QID_AC_BE:
 487         case QID_AC_BK:
 488                 completion = &queue->rt2x00dev->txdone_work;
 489                 break;
 490         case QID_RX:
 491                 completion = &queue->rt2x00dev->rxdone_work;
 492                 break;
 493         default:
 494                 return;
 495         }
 496
 497         for (i = 0; i < 10; i++) {
 498                 /*
 499                  * Check if the driver is already done, otherwise we
 500                  * have to sleep a little while to give the driver/hw
 501                  * the oppurtunity to complete interrupt process itself.
 502                  */
 503                 if (rt2x00queue_empty(queue))
 504                         break;
 505
 506                 /*
 507                  * Schedule the completion handler manually, when this
 508                  * worker function runs, it should cleanup the queue.
 509                  */
 510                 queue_work(queue->rt2x00dev->workqueue, completion);
 511
 512                 /*
 513                  * Wait for a little while to give the driver
 514                  * the oppurtunity to recover itself.
 515                  */
 516                 msleep(10);
 517         }
 518 }
 519 EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue);
 520
 521 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
 522 {
 523         WARNING(queue->rt2x00dev, "TX queue %d DMA timed out,"
 524                 " invoke forced forced reset\n", queue->qid);
 525
 526         rt2x00queue_flush_queue(queue, true);
 527 }
 528
 529 static void rt2x00usb_watchdog_tx_status(struct data_queue *queue)
 530 {
 531         WARNING(queue->rt2x00dev, "TX queue %d status timed out,"
 532                 " invoke forced tx handler\n", queue->qid);
 533
 534         queue_work(queue->rt2x00dev->workqueue, &queue->rt2x00dev->txdone_work);
 535 }
 536
 537 static int rt2x00usb_status_timeout(struct data_queue *queue)
 538 {
 539         struct queue_entry *entry;
 540
 541         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 542         return rt2x00queue_status_timeout(entry);
 543 }
 544
 545 static int rt2x00usb_dma_timeout(struct data_queue *queue)
 546 {
 547         struct queue_entry *entry;
 548
 549         entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE);
 550         return rt2x00queue_dma_timeout(entry);
 551 }
 552
 553 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 554 {
 555         struct data_queue *queue;
 556
 557         tx_queue_for_each(rt2x00dev, queue) {
 558                 if (!rt2x00queue_empty(queue)) {
 559                         if (rt2x00usb_dma_timeout(queue))
 560                                 rt2x00usb_watchdog_tx_dma(queue);
 561                         if (rt2x00usb_status_timeout(queue))
 562                                 rt2x00usb_watchdog_tx_status(queue);
 563                 }
 564         }
 565 }
 566 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 567
 568 /*
 569  * Radio handlers
 570  */
 571 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 572 {
 573         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 574                                     REGISTER_TIMEOUT);
 575 }
 576 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 577
 578 /*
 579  * Device initialization handlers.
 580  */
 581 void rt2x00usb_clear_entry(struct queue_entry *entry)
 582 {
 583         entry->flags = 0;
 584
 585         if (entry->queue->qid == QID_RX)
 586                 rt2x00usb_kick_rx_entry(entry, NULL);
 587 }
 588 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 589
 590 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 591                                       struct usb_endpoint_descriptor *ep_desc)
 592 {
 593         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 594         int pipe;
 595
 596         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 597
 598         if (queue->qid == QID_RX) {
 599                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 600                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 601         } else {
 602                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 603                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 604         }
 605
 606         if (!queue->usb_maxpacket)
 607                 queue->usb_maxpacket = 1;
 608 }
 609
 610 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 611 {
 612         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 613         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 614         struct usb_endpoint_descriptor *ep_desc;
 615         struct data_queue *queue = rt2x00dev->tx;
 616         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 617         unsigned int i;
 618
 619         /*
 620          * Walk through all available endpoints to search for "bulk in"
 621          * and "bulk out" endpoints. When we find such endpoints collect
 622          * the information we need from the descriptor and assign it
 623          * to the queue.
 624          */
 625         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 626                 ep_desc = &intf_desc->endpoint[i].desc;
 627
 628                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 629                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 630                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 631                            (queue != queue_end(rt2x00dev))) {
 632                         rt2x00usb_assign_endpoint(queue, ep_desc);
 633                         queue = queue_next(queue);
 634
 635                         tx_ep_desc = ep_desc;
 636                 }
 637         }
 638
 639         /*
 640          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 641          */
 642         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 643                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 644                 return -EPIPE;
 645         }
 646
 647         /*
 648          * It might be possible not all queues have a dedicated endpoint.
 649          * Loop through all TX queues and copy the endpoint information
 650          * which we have gathered from already assigned endpoints.
 651          */
 652         txall_queue_for_each(rt2x00dev, queue) {
 653                 if (!queue->usb_endpoint)
 654                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 655         }
 656
 657         return 0;
 658 }
 659
 660 static int rt2x00usb_alloc_entries(struct data_queue *queue)
 661 {
 662         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 663         struct queue_entry_priv_usb *entry_priv;
 664         struct queue_entry_priv_usb_bcn *bcn_priv;
 665         unsigned int i;
 666
 667         for (i = 0; i < queue->limit; i++) {
 668                 entry_priv = queue->entries[i].priv_data;
 669                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 670                 if (!entry_priv->urb)
 671                         return -ENOMEM;
 672         }
 673
 674         /*
 675          * If this is not the beacon queue or
 676          * no guardian byte was required for the beacon,
 677          * then we are done.
 678          */
 679         if (queue->qid != QID_BEACON ||
 680             !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
 681                 return 0;
 682
 683         for (i = 0; i < queue->limit; i++) {
 684                 bcn_priv = queue->entries[i].priv_data;
 685                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 686                 if (!bcn_priv->guardian_urb)
 687                         return -ENOMEM;
 688         }
 689
 690         return 0;
 691 }
 692
 693 static void rt2x00usb_free_entries(struct data_queue *queue)
 694 {
 695         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 696         struct queue_entry_priv_usb *entry_priv;
 697         struct queue_entry_priv_usb_bcn *bcn_priv;
 698         unsigned int i;
 699
 700         if (!queue->entries)
 701                 return;
 702
 703         for (i = 0; i < queue->limit; i++) {
 704                 entry_priv = queue->entries[i].priv_data;
 705                 usb_kill_urb(entry_priv->urb);
 706                 usb_free_urb(entry_priv->urb);
 707         }
 708
 709         /*
 710          * If this is not the beacon queue or
 711          * no guardian byte was required for the beacon,
 712          * then we are done.
 713          */
 714         if (queue->qid != QID_BEACON ||
 715             !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
 716                 return;
 717
 718         for (i = 0; i < queue->limit; i++) {
 719                 bcn_priv = queue->entries[i].priv_data;
 720                 usb_kill_urb(bcn_priv->guardian_urb);
 721                 usb_free_urb(bcn_priv->guardian_urb);
 722         }
 723 }
 724
 725 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 726 {
 727         struct data_queue *queue;
 728         int status;
 729
 730         /*
 731          * Find endpoints for each queue
 732          */
 733         status = rt2x00usb_find_endpoints(rt2x00dev);
 734         if (status)
 735                 goto exit;
 736
 737         /*
 738          * Allocate DMA
 739          */
 740         queue_for_each(rt2x00dev, queue) {
 741                 status = rt2x00usb_alloc_entries(queue);
 742                 if (status)
 743                         goto exit;
 744         }
 745
 746         return 0;
 747
 748 exit:
 749         rt2x00usb_uninitialize(rt2x00dev);
 750
 751         return status;
 752 }
 753 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 754
 755 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 756 {
 757         struct data_queue *queue;
 758
 759         queue_for_each(rt2x00dev, queue)
 760                 rt2x00usb_free_entries(queue);
 761 }
 762 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 763
 764 /*
 765  * USB driver handlers.
 766  */
 767 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 768 {
 769         kfree(rt2x00dev->rf);
 770         rt2x00dev->rf = NULL;
 771
 772         kfree(rt2x00dev->eeprom);
 773         rt2x00dev->eeprom = NULL;
 774
 775         kfree(rt2x00dev->csr.cache);
 776         rt2x00dev->csr.cache = NULL;
 777 }
 778
 779 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 780 {
 781         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 782         if (!rt2x00dev->csr.cache)
 783                 goto exit;
 784
 785         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 786         if (!rt2x00dev->eeprom)
 787                 goto exit;
 788
 789         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 790         if (!rt2x00dev->rf)
 791                 goto exit;
 792
 793         return 0;
 794
 795 exit:
 796         ERROR_PROBE("Failed to allocate registers.\n");
 797
 798         rt2x00usb_free_reg(rt2x00dev);
 799
 800         return -ENOMEM;
 801 }
 802
 803 int rt2x00usb_probe(struct usb_interface *usb_intf,
 804                     const struct rt2x00_ops *ops)
 805 {
 806         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 807         struct ieee80211_hw *hw;
 808         struct rt2x00_dev *rt2x00dev;
 809         int retval;
 810
 811         usb_dev = usb_get_dev(usb_dev);
 812         usb_reset_device(usb_dev);
 813
 814         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 815         if (!hw) {
 816                 ERROR_PROBE("Failed to allocate hardware.\n");
 817                 retval = -ENOMEM;
 818                 goto exit_put_device;
 819         }
 820
 821         usb_set_intfdata(usb_intf, hw);
 822
 823         rt2x00dev = hw->priv;
 824         rt2x00dev->dev = &usb_intf->dev;
 825         rt2x00dev->ops = ops;
 826         rt2x00dev->hw = hw;
 827
 828         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 829
 830         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 831         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 832         init_timer(&rt2x00dev->txstatus_timer);
 833
 834         retval = rt2x00usb_alloc_reg(rt2x00dev);
 835         if (retval)
 836                 goto exit_free_device;
 837
 838         retval = rt2x00lib_probe_dev(rt2x00dev);
 839         if (retval)
 840                 goto exit_free_reg;
 841
 842         return 0;
 843
 844 exit_free_reg:
 845         rt2x00usb_free_reg(rt2x00dev);
 846
 847 exit_free_device:
 848         ieee80211_free_hw(hw);
 849
 850 exit_put_device:
 851         usb_put_dev(usb_dev);
 852
 853         usb_set_intfdata(usb_intf, NULL);
 854
 855         return retval;
 856 }
 857 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 858
 859 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 860 {
 861         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 862         struct rt2x00_dev *rt2x00dev = hw->priv;
 863
 864         /*
 865          * Free all allocated data.
 866          */
 867         rt2x00lib_remove_dev(rt2x00dev);
 868         rt2x00usb_free_reg(rt2x00dev);
 869         ieee80211_free_hw(hw);
 870
 871         /*
 872          * Free the USB device data.
 873          */
 874         usb_set_intfdata(usb_intf, NULL);
 875         usb_put_dev(interface_to_usbdev(usb_intf));
 876 }
 877 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 878
 879 #ifdef CONFIG_PM
 880 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 881 {
 882         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 883         struct rt2x00_dev *rt2x00dev = hw->priv;
 884
 885         return rt2x00lib_suspend(rt2x00dev, state);
 886 }
 887 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 888
 889 int rt2x00usb_resume(struct usb_interface *usb_intf)
 890 {
 891         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 892         struct rt2x00_dev *rt2x00dev = hw->priv;
 893
 894         return rt2x00lib_resume(rt2x00dev);
 895 }
 896 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 897 #endif /* CONFIG_PM */
 898
 899 /*
 900  * rt2x00usb module information.
 901  */
 902 MODULE_AUTHOR(DRV_PROJECT);
 903 MODULE_VERSION(DRV_VERSION);
 904 MODULE_DESCRIPTION("rt2x00 usb library");
 905 MODULE_LICENSE("GPL");