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 <[email protected]>
   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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21         Module: rt2x00usb
  22         Abstract: rt2x00 generic usb device routines.
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/slab.h>
  28 #include <linux/usb.h>
  29 #include <linux/bug.h>
  30
  31 #include "rt2x00.h"
  32 #include "rt2x00usb.h"
  33
  34 /*
  35  * Interfacing with the HW.
  36  */
  37 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
  38                              const u8 request, const u8 requesttype,
  39                              const u16 offset, const u16 value,
  40                              void *buffer, const u16 buffer_length,
  41                              const int timeout)
  42 {
  43         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
  44         int status;
  45         unsigned int i;
  46         unsigned int pipe =
  47             (requesttype == USB_VENDOR_REQUEST_IN) ?
  48             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
  49
  50         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
  51                 return -ENODEV;
  52
  53         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
  54                 status = usb_control_msg(usb_dev, pipe, request, requesttype,
  55                                          value, offset, buffer, buffer_length,
  56                                          timeout);
  57                 if (status >= 0)
  58                         return 0;
  59
  60                 /*
  61                  * Check for errors
  62                  * -ENODEV: Device has disappeared, no point continuing.
  63                  * All other errors: Try again.
  64                  */
  65                 else if (status == -ENODEV) {
  66                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
  67                         break;
  68                 }
  69         }
  70
  71         rt2x00_err(rt2x00dev,
  72                    "Vendor Request 0x%02x failed for offset 0x%04x with error %d\n",
  73                    request, offset, status);
  74
  75         return status;
  76 }
  77 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
  78
  79 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
  80                                    const u8 request, const u8 requesttype,
  81                                    const u16 offset, void *buffer,
  82                                    const u16 buffer_length, const int timeout)
  83 {
  84         int status;
  85
  86         BUG_ON(!mutex_is_locked(&rt2x00dev->csr_mutex));
  87
  88         /*
  89          * Check for Cache availability.
  90          */
  91         if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
  92                 rt2x00_err(rt2x00dev, "CSR cache not available\n");
  93                 return -ENOMEM;
  94         }
  95
  96         if (requesttype == USB_VENDOR_REQUEST_OUT)
  97                 memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
  98
  99         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
 100                                           offset, 0, rt2x00dev->csr.cache,
 101                                           buffer_length, timeout);
 102
 103         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
 104                 memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
 105
 106         return status;
 107 }
 108 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
 109
 110 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 111                                   const u8 request, const u8 requesttype,
 112                                   const u16 offset, void *buffer,
 113                                   const u16 buffer_length, const int timeout)
 114 {
 115         int status = 0;
 116         unsigned char *tb;
 117         u16 off, len, bsize;
 118
 119         mutex_lock(&rt2x00dev->csr_mutex);
 120
 121         tb  = (char *)buffer;
 122         off = offset;
 123         len = buffer_length;
 124         while (len && !status) {
 125                 bsize = min_t(u16, CSR_CACHE_SIZE, len);
 126                 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
 127                                                         requesttype, off, tb,
 128                                                         bsize, timeout);
 129
 130                 tb  += bsize;
 131                 len -= bsize;
 132                 off += bsize;
 133         }
 134
 135         mutex_unlock(&rt2x00dev->csr_mutex);
 136
 137         return status;
 138 }
 139 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 140
 141 int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
 142                            const unsigned int offset,
 143                            const struct rt2x00_field32 field,
 144                            u32 *reg)
 145 {
 146         unsigned int i;
 147
 148         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 149                 return -ENODEV;
 150
 151         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
 152                 rt2x00usb_register_read_lock(rt2x00dev, offset, reg);
 153                 if (!rt2x00_get_field32(*reg, field))
 154                         return 1;
 155                 udelay(REGISTER_BUSY_DELAY);
 156         }
 157
 158         rt2x00_err(rt2x00dev, "Indirect register access failed: offset=0x%.08x, value=0x%.08x\n",
 159                    offset, *reg);
 160         *reg = ~0;
 161
 162         return 0;
 163 }
 164 EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read);
 165
 166
 167 struct rt2x00_async_read_data {
 168         __le32 reg;
 169         struct usb_ctrlrequest cr;
 170         struct rt2x00_dev *rt2x00dev;
 171         bool (*callback)(struct rt2x00_dev *, int, u32);
 172 };
 173
 174 static void rt2x00usb_register_read_async_cb(struct urb *urb)
 175 {
 176         struct rt2x00_async_read_data *rd = urb->context;
 177         if (rd->callback(rd->rt2x00dev, urb->status, le32_to_cpu(rd->reg))) {
 178                 if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
 179                         kfree(rd);
 180         } else
 181                 kfree(rd);
 182 }
 183
 184 void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev,
 185                                    const unsigned int offset,
 186                                    bool (*callback)(struct rt2x00_dev*, int, u32))
 187 {
 188         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 189         struct urb *urb;
 190         struct rt2x00_async_read_data *rd;
 191
 192         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 193         if (!rd)
 194                 return;
 195
 196         urb = usb_alloc_urb(0, GFP_ATOMIC);
 197         if (!urb) {
 198                 kfree(rd);
 199                 return;
 200         }
 201
 202         rd->rt2x00dev = rt2x00dev;
 203         rd->callback = callback;
 204         rd->cr.bRequestType = USB_VENDOR_REQUEST_IN;
 205         rd->cr.bRequest = USB_MULTI_READ;
 206         rd->cr.wValue = 0;
 207         rd->cr.wIndex = cpu_to_le16(offset);
 208         rd->cr.wLength = cpu_to_le16(sizeof(u32));
 209
 210         usb_fill_control_urb(urb, usb_dev, usb_rcvctrlpipe(usb_dev, 0),
 211                              (unsigned char *)(&rd->cr), &rd->reg, sizeof(rd->reg),
 212                              rt2x00usb_register_read_async_cb, rd);
 213         if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
 214                 kfree(rd);
 215         usb_free_urb(urb);
 216 }
 217 EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async);
 218
 219 /*
 220  * TX data handlers.
 221  */
 222 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
 223 {
 224         /*
 225          * If the transfer to hardware succeeded, it does not mean the
 226          * frame was send out correctly. It only means the frame
 227          * was successfully pushed to the hardware, we have no
 228          * way to determine the transmission status right now.
 229          * (Only indirectly by looking at the failed TX counters
 230          * in the register).
 231          */
 232         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 233                 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
 234         else
 235                 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
 236 }
 237
 238 static void rt2x00usb_work_txdone(struct work_struct *work)
 239 {
 240         struct rt2x00_dev *rt2x00dev =
 241             container_of(work, struct rt2x00_dev, txdone_work);
 242         struct data_queue *queue;
 243         struct queue_entry *entry;
 244
 245         tx_queue_for_each(rt2x00dev, queue) {
 246                 while (!rt2x00queue_empty(queue)) {
 247                         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 248
 249                         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 250                             !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 251                                 break;
 252
 253                         rt2x00usb_work_txdone_entry(entry);
 254                 }
 255         }
 256 }
 257
 258 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 259 {
 260         struct queue_entry *entry = (struct queue_entry *)urb->context;
 261         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 262
 263         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 264                 return;
 265         /*
 266          * Check if the frame was correctly uploaded
 267          */
 268         if (urb->status)
 269                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 270         /*
 271          * Report the frame as DMA done
 272          */
 273         rt2x00lib_dmadone(entry);
 274
 275         if (rt2x00dev->ops->lib->tx_dma_done)
 276                 rt2x00dev->ops->lib->tx_dma_done(entry);
 277         /*
 278          * Schedule the delayed work for reading the TX status
 279          * from the device.
 280          */
 281         if (!test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags) ||
 282             !kfifo_is_empty(&rt2x00dev->txstatus_fifo))
 283                 queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
 284 }
 285
 286 static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void *data)
 287 {
 288         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 289         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 290         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 291         u32 length;
 292         int status;
 293
 294         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
 295             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 296                 return false;
 297
 298         /*
 299          * USB devices require certain padding at the end of each frame
 300          * and urb. Those paddings are not included in skbs. Pass entry
 301          * to the driver to determine what the overall length should be.
 302          */
 303         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 304
 305         status = skb_padto(entry->skb, length);
 306         if (unlikely(status)) {
 307                 /* TODO: report something more appropriate than IO_FAILED. */
 308                 rt2x00_warn(rt2x00dev, "TX SKB padding error, out of memory\n");
 309                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 310                 rt2x00lib_dmadone(entry);
 311
 312                 return false;
 313         }
 314
 315         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 316                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 317                           entry->skb->data, length,
 318                           rt2x00usb_interrupt_txdone, entry);
 319
 320         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 321         if (status) {
 322                 if (status == -ENODEV)
 323                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 324                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 325                 rt2x00lib_dmadone(entry);
 326         }
 327
 328         return false;
 329 }
 330
 331 /*
 332  * RX data handlers.
 333  */
 334 static void rt2x00usb_work_rxdone(struct work_struct *work)
 335 {
 336         struct rt2x00_dev *rt2x00dev =
 337             container_of(work, struct rt2x00_dev, rxdone_work);
 338         struct queue_entry *entry;
 339         struct skb_frame_desc *skbdesc;
 340         u8 rxd[32];
 341
 342         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 343                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 344
 345                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 346                     !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 347                         break;
 348
 349                 /*
 350                  * Fill in desc fields of the skb descriptor
 351                  */
 352                 skbdesc = get_skb_frame_desc(entry->skb);
 353                 skbdesc->desc = rxd;
 354                 skbdesc->desc_len = entry->queue->desc_size;
 355
 356                 /*
 357                  * Send the frame to rt2x00lib for further processing.
 358                  */
 359                 rt2x00lib_rxdone(entry, GFP_KERNEL);
 360         }
 361 }
 362
 363 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 364 {
 365         struct queue_entry *entry = (struct queue_entry *)urb->context;
 366         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 367
 368         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 369                 return;
 370
 371         /*
 372          * Report the frame as DMA done
 373          */
 374         rt2x00lib_dmadone(entry);
 375
 376         /*
 377          * Check if the received data is simply too small
 378          * to be actually valid, or if the urb is signaling
 379          * a problem.
 380          */
 381         if (urb->actual_length < entry->queue->desc_size || urb->status)
 382                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 383
 384         /*
 385          * Schedule the delayed work for reading the RX status
 386          * from the device.
 387          */
 388         queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
 389 }
 390
 391 static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data)
 392 {
 393         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 394         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 395         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 396         int status;
 397
 398         if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 399             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 400                 return false;
 401
 402         rt2x00lib_dmastart(entry);
 403
 404         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 405                           usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
 406                           entry->skb->data, entry->skb->len,
 407                           rt2x00usb_interrupt_rxdone, entry);
 408
 409         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 410         if (status) {
 411                 if (status == -ENODEV)
 412                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 413                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 414                 rt2x00lib_dmadone(entry);
 415         }
 416
 417         return false;
 418 }
 419
 420 void rt2x00usb_kick_queue(struct data_queue *queue)
 421 {
 422         switch (queue->qid) {
 423         case QID_AC_VO:
 424         case QID_AC_VI:
 425         case QID_AC_BE:
 426         case QID_AC_BK:
 427                 if (!rt2x00queue_empty(queue))
 428                         rt2x00queue_for_each_entry(queue,
 429                                                    Q_INDEX_DONE,
 430                                                    Q_INDEX,
 431                                                    NULL,
 432                                                    rt2x00usb_kick_tx_entry);
 433                 break;
 434         case QID_RX:
 435                 if (!rt2x00queue_full(queue))
 436                         rt2x00queue_for_each_entry(queue,
 437                                                    Q_INDEX,
 438                                                    Q_INDEX_DONE,
 439                                                    NULL,
 440                                                    rt2x00usb_kick_rx_entry);
 441                 break;
 442         default:
 443                 break;
 444         }
 445 }
 446 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
 447
 448 static bool rt2x00usb_flush_entry(struct queue_entry *entry, void *data)
 449 {
 450         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 451         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 452         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
 453
 454         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 455                 return false;
 456
 457         usb_kill_urb(entry_priv->urb);
 458
 459         /*
 460          * Kill guardian urb (if required by driver).
 461          */
 462         if ((entry->queue->qid == QID_BEACON) &&
 463             (test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags)))
 464                 usb_kill_urb(bcn_priv->guardian_urb);
 465
 466         return false;
 467 }
 468
 469 void rt2x00usb_flush_queue(struct data_queue *queue, bool drop)
 470 {
 471         struct work_struct *completion;
 472         unsigned int i;
 473
 474         if (drop)
 475                 rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL,
 476                                            rt2x00usb_flush_entry);
 477
 478         /*
 479          * Obtain the queue completion handler
 480          */
 481         switch (queue->qid) {
 482         case QID_AC_VO:
 483         case QID_AC_VI:
 484         case QID_AC_BE:
 485         case QID_AC_BK:
 486                 completion = &queue->rt2x00dev->txdone_work;
 487                 break;
 488         case QID_RX:
 489                 completion = &queue->rt2x00dev->rxdone_work;
 490                 break;
 491         default:
 492                 return;
 493         }
 494
 495         for (i = 0; i < 10; i++) {
 496                 /*
 497                  * Check if the driver is already done, otherwise we
 498                  * have to sleep a little while to give the driver/hw
 499                  * the oppurtunity to complete interrupt process itself.
 500                  */
 501                 if (rt2x00queue_empty(queue))
 502                         break;
 503
 504                 /*
 505                  * Schedule the completion handler manually, when this
 506                  * worker function runs, it should cleanup the queue.
 507                  */
 508                 queue_work(queue->rt2x00dev->workqueue, completion);
 509
 510                 /*
 511                  * Wait for a little while to give the driver
 512                  * the oppurtunity to recover itself.
 513                  */
 514                 msleep(10);
 515         }
 516 }
 517 EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue);
 518
 519 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
 520 {
 521         rt2x00_warn(queue->rt2x00dev, "TX queue %d DMA timed out, invoke forced forced reset\n",
 522                     queue->qid);
 523
 524         rt2x00queue_stop_queue(queue);
 525         rt2x00queue_flush_queue(queue, true);
 526         rt2x00queue_start_queue(queue);
 527 }
 528
 529 static int rt2x00usb_dma_timeout(struct data_queue *queue)
 530 {
 531         struct queue_entry *entry;
 532
 533         entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE);
 534         return rt2x00queue_dma_timeout(entry);
 535 }
 536
 537 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 538 {
 539         struct data_queue *queue;
 540
 541         tx_queue_for_each(rt2x00dev, queue) {
 542                 if (!rt2x00queue_empty(queue)) {
 543                         if (rt2x00usb_dma_timeout(queue))
 544                                 rt2x00usb_watchdog_tx_dma(queue);
 545                 }
 546         }
 547 }
 548 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 549
 550 /*
 551  * Radio handlers
 552  */
 553 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 554 {
 555         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 556                                     REGISTER_TIMEOUT);
 557 }
 558 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 559
 560 /*
 561  * Device initialization handlers.
 562  */
 563 void rt2x00usb_clear_entry(struct queue_entry *entry)
 564 {
 565         entry->flags = 0;
 566
 567         if (entry->queue->qid == QID_RX)
 568                 rt2x00usb_kick_rx_entry(entry, NULL);
 569 }
 570 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 571
 572 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 573                                       struct usb_endpoint_descriptor *ep_desc)
 574 {
 575         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 576         int pipe;
 577
 578         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 579
 580         if (queue->qid == QID_RX) {
 581                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 582                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 583         } else {
 584                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 585                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 586         }
 587
 588         if (!queue->usb_maxpacket)
 589                 queue->usb_maxpacket = 1;
 590 }
 591
 592 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 593 {
 594         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 595         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 596         struct usb_endpoint_descriptor *ep_desc;
 597         struct data_queue *queue = rt2x00dev->tx;
 598         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 599         unsigned int i;
 600
 601         /*
 602          * Walk through all available endpoints to search for "bulk in"
 603          * and "bulk out" endpoints. When we find such endpoints collect
 604          * the information we need from the descriptor and assign it
 605          * to the queue.
 606          */
 607         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 608                 ep_desc = &intf_desc->endpoint[i].desc;
 609
 610                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 611                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 612                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 613                            (queue != queue_end(rt2x00dev))) {
 614                         rt2x00usb_assign_endpoint(queue, ep_desc);
 615                         queue = queue_next(queue);
 616
 617                         tx_ep_desc = ep_desc;
 618                 }
 619         }
 620
 621         /*
 622          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 623          */
 624         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 625                 rt2x00_err(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 626                 return -EPIPE;
 627         }
 628
 629         /*
 630          * It might be possible not all queues have a dedicated endpoint.
 631          * Loop through all TX queues and copy the endpoint information
 632          * which we have gathered from already assigned endpoints.
 633          */
 634         txall_queue_for_each(rt2x00dev, queue) {
 635                 if (!queue->usb_endpoint)
 636                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 637         }
 638
 639         return 0;
 640 }
 641
 642 static int rt2x00usb_alloc_entries(struct data_queue *queue)
 643 {
 644         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 645         struct queue_entry_priv_usb *entry_priv;
 646         struct queue_entry_priv_usb_bcn *bcn_priv;
 647         unsigned int i;
 648
 649         for (i = 0; i < queue->limit; i++) {
 650                 entry_priv = queue->entries[i].priv_data;
 651                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 652                 if (!entry_priv->urb)
 653                         return -ENOMEM;
 654         }
 655
 656         /*
 657          * If this is not the beacon queue or
 658          * no guardian byte was required for the beacon,
 659          * then we are done.
 660          */
 661         if (queue->qid != QID_BEACON ||
 662             !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
 663                 return 0;
 664
 665         for (i = 0; i < queue->limit; i++) {
 666                 bcn_priv = queue->entries[i].priv_data;
 667                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 668                 if (!bcn_priv->guardian_urb)
 669                         return -ENOMEM;
 670         }
 671
 672         return 0;
 673 }
 674
 675 static void rt2x00usb_free_entries(struct data_queue *queue)
 676 {
 677         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 678         struct queue_entry_priv_usb *entry_priv;
 679         struct queue_entry_priv_usb_bcn *bcn_priv;
 680         unsigned int i;
 681
 682         if (!queue->entries)
 683                 return;
 684
 685         for (i = 0; i < queue->limit; i++) {
 686                 entry_priv = queue->entries[i].priv_data;
 687                 usb_kill_urb(entry_priv->urb);
 688                 usb_free_urb(entry_priv->urb);
 689         }
 690
 691         /*
 692          * If this is not the beacon queue or
 693          * no guardian byte was required for the beacon,
 694          * then we are done.
 695          */
 696         if (queue->qid != QID_BEACON ||
 697             !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
 698                 return;
 699
 700         for (i = 0; i < queue->limit; i++) {
 701                 bcn_priv = queue->entries[i].priv_data;
 702                 usb_kill_urb(bcn_priv->guardian_urb);
 703                 usb_free_urb(bcn_priv->guardian_urb);
 704         }
 705 }
 706
 707 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 708 {
 709         struct data_queue *queue;
 710         int status;
 711
 712         /*
 713          * Find endpoints for each queue
 714          */
 715         status = rt2x00usb_find_endpoints(rt2x00dev);
 716         if (status)
 717                 goto exit;
 718
 719         /*
 720          * Allocate DMA
 721          */
 722         queue_for_each(rt2x00dev, queue) {
 723                 status = rt2x00usb_alloc_entries(queue);
 724                 if (status)
 725                         goto exit;
 726         }
 727
 728         return 0;
 729
 730 exit:
 731         rt2x00usb_uninitialize(rt2x00dev);
 732
 733         return status;
 734 }
 735 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 736
 737 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 738 {
 739         struct data_queue *queue;
 740
 741         queue_for_each(rt2x00dev, queue)
 742                 rt2x00usb_free_entries(queue);
 743 }
 744 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 745
 746 /*
 747  * USB driver handlers.
 748  */
 749 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 750 {
 751         kfree(rt2x00dev->rf);
 752         rt2x00dev->rf = NULL;
 753
 754         kfree(rt2x00dev->eeprom);
 755         rt2x00dev->eeprom = NULL;
 756
 757         kfree(rt2x00dev->csr.cache);
 758         rt2x00dev->csr.cache = NULL;
 759 }
 760
 761 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 762 {
 763         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 764         if (!rt2x00dev->csr.cache)
 765                 goto exit;
 766
 767         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 768         if (!rt2x00dev->eeprom)
 769                 goto exit;
 770
 771         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 772         if (!rt2x00dev->rf)
 773                 goto exit;
 774
 775         return 0;
 776
 777 exit:
 778         rt2x00_probe_err("Failed to allocate registers\n");
 779
 780         rt2x00usb_free_reg(rt2x00dev);
 781
 782         return -ENOMEM;
 783 }
 784
 785 int rt2x00usb_probe(struct usb_interface *usb_intf,
 786                     const struct rt2x00_ops *ops)
 787 {
 788         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 789         struct ieee80211_hw *hw;
 790         struct rt2x00_dev *rt2x00dev;
 791         int retval;
 792
 793         usb_dev = usb_get_dev(usb_dev);
 794         usb_reset_device(usb_dev);
 795
 796         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 797         if (!hw) {
 798                 rt2x00_probe_err("Failed to allocate hardware\n");
 799                 retval = -ENOMEM;
 800                 goto exit_put_device;
 801         }
 802
 803         usb_set_intfdata(usb_intf, hw);
 804
 805         rt2x00dev = hw->priv;
 806         rt2x00dev->dev = &usb_intf->dev;
 807         rt2x00dev->ops = ops;
 808         rt2x00dev->hw = hw;
 809
 810         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 811
 812         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 813         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 814         hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC,
 815                      HRTIMER_MODE_REL);
 816
 817         retval = rt2x00usb_alloc_reg(rt2x00dev);
 818         if (retval)
 819                 goto exit_free_device;
 820
 821         retval = rt2x00lib_probe_dev(rt2x00dev);
 822         if (retval)
 823                 goto exit_free_reg;
 824
 825         return 0;
 826
 827 exit_free_reg:
 828         rt2x00usb_free_reg(rt2x00dev);
 829
 830 exit_free_device:
 831         ieee80211_free_hw(hw);
 832
 833 exit_put_device:
 834         usb_put_dev(usb_dev);
 835
 836         usb_set_intfdata(usb_intf, NULL);
 837
 838         return retval;
 839 }
 840 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 841
 842 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 843 {
 844         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 845         struct rt2x00_dev *rt2x00dev = hw->priv;
 846
 847         /*
 848          * Free all allocated data.
 849          */
 850         rt2x00lib_remove_dev(rt2x00dev);
 851         rt2x00usb_free_reg(rt2x00dev);
 852         ieee80211_free_hw(hw);
 853
 854         /*
 855          * Free the USB device data.
 856          */
 857         usb_set_intfdata(usb_intf, NULL);
 858         usb_put_dev(interface_to_usbdev(usb_intf));
 859 }
 860 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 861
 862 #ifdef CONFIG_PM
 863 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 864 {
 865         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 866         struct rt2x00_dev *rt2x00dev = hw->priv;
 867
 868         return rt2x00lib_suspend(rt2x00dev, state);
 869 }
 870 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 871
 872 int rt2x00usb_resume(struct usb_interface *usb_intf)
 873 {
 874         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 875         struct rt2x00_dev *rt2x00dev = hw->priv;
 876
 877         return rt2x00lib_resume(rt2x00dev);
 878 }
 879 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 880 #endif /* CONFIG_PM */
 881
 882 /*
 883  * rt2x00usb module information.
 884  */
 885 MODULE_AUTHOR(DRV_PROJECT);
 886 MODULE_VERSION(DRV_VERSION);
 887 MODULE_DESCRIPTION("rt2x00 usb library");
 888 MODULE_LICENSE("GPL");