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, 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 pipe =
  46             (requesttype == USB_VENDOR_REQUEST_IN) ?
  47             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
  48         unsigned long expire = jiffies + msecs_to_jiffies(timeout);
  49
  50         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
  51                 return -ENODEV;
  52
  53         do {
  54                 status = usb_control_msg(usb_dev, pipe, request, requesttype,
  55                                          value, offset, buffer, buffer_length,
  56                                          timeout / 2);
  57                 if (status >= 0)
  58                         return 0;
  59
  60                 if (status == -ENODEV) {
  61                         /* Device has disappeared. */
  62                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
  63                         break;
  64                 }
  65         } while (time_before(jiffies, expire));
  66
  67         rt2x00_err(rt2x00dev,
  68                    "Vendor Request 0x%02x failed for offset 0x%04x with error %d\n",
  69                    request, offset, status);
  70
  71         return status;
  72 }
  73 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
  74
  75 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
  76                                    const u8 request, const u8 requesttype,
  77                                    const u16 offset, void *buffer,
  78                                    const u16 buffer_length, const int timeout)
  79 {
  80         int status;
  81
  82         BUG_ON(!mutex_is_locked(&rt2x00dev->csr_mutex));
  83
  84         /*
  85          * Check for Cache availability.
  86          */
  87         if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
  88                 rt2x00_err(rt2x00dev, "CSR cache not available\n");
  89                 return -ENOMEM;
  90         }
  91
  92         if (requesttype == USB_VENDOR_REQUEST_OUT)
  93                 memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
  94
  95         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
  96                                           offset, 0, rt2x00dev->csr.cache,
  97                                           buffer_length, timeout);
  98
  99         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
 100                 memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
 101
 102         return status;
 103 }
 104 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
 105
 106 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 107                                   const u8 request, const u8 requesttype,
 108                                   const u16 offset, void *buffer,
 109                                   const u16 buffer_length)
 110 {
 111         int status = 0;
 112         unsigned char *tb;
 113         u16 off, len, bsize;
 114
 115         mutex_lock(&rt2x00dev->csr_mutex);
 116
 117         tb  = (char *)buffer;
 118         off = offset;
 119         len = buffer_length;
 120         while (len && !status) {
 121                 bsize = min_t(u16, CSR_CACHE_SIZE, len);
 122                 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
 123                                                         requesttype, off, tb,
 124                                                         bsize, REGISTER_TIMEOUT);
 125
 126                 tb  += bsize;
 127                 len -= bsize;
 128                 off += bsize;
 129         }
 130
 131         mutex_unlock(&rt2x00dev->csr_mutex);
 132
 133         return status;
 134 }
 135 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 136
 137 int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
 138                            const unsigned int offset,
 139                            const struct rt2x00_field32 field,
 140                            u32 *reg)
 141 {
 142         unsigned int i;
 143
 144         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 145                 return -ENODEV;
 146
 147         for (i = 0; i < REGISTER_USB_BUSY_COUNT; i++) {
 148                 rt2x00usb_register_read_lock(rt2x00dev, offset, reg);
 149                 if (!rt2x00_get_field32(*reg, field))
 150                         return 1;
 151                 udelay(REGISTER_BUSY_DELAY);
 152         }
 153
 154         rt2x00_err(rt2x00dev, "Indirect register access failed: offset=0x%.08x, value=0x%.08x\n",
 155                    offset, *reg);
 156         *reg = ~0;
 157
 158         return 0;
 159 }
 160 EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read);
 161
 162
 163 struct rt2x00_async_read_data {
 164         __le32 reg;
 165         struct usb_ctrlrequest cr;
 166         struct rt2x00_dev *rt2x00dev;
 167         bool (*callback)(struct rt2x00_dev *, int, u32);
 168 };
 169
 170 static void rt2x00usb_register_read_async_cb(struct urb *urb)
 171 {
 172         struct rt2x00_async_read_data *rd = urb->context;
 173         if (rd->callback(rd->rt2x00dev, urb->status, le32_to_cpu(rd->reg))) {
 174                 if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
 175                         kfree(rd);
 176         } else
 177                 kfree(rd);
 178 }
 179
 180 void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev,
 181                                    const unsigned int offset,
 182                                    bool (*callback)(struct rt2x00_dev*, int, u32))
 183 {
 184         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 185         struct urb *urb;
 186         struct rt2x00_async_read_data *rd;
 187
 188         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 189         if (!rd)
 190                 return;
 191
 192         urb = usb_alloc_urb(0, GFP_ATOMIC);
 193         if (!urb) {
 194                 kfree(rd);
 195                 return;
 196         }
 197
 198         rd->rt2x00dev = rt2x00dev;
 199         rd->callback = callback;
 200         rd->cr.bRequestType = USB_VENDOR_REQUEST_IN;
 201         rd->cr.bRequest = USB_MULTI_READ;
 202         rd->cr.wValue = 0;
 203         rd->cr.wIndex = cpu_to_le16(offset);
 204         rd->cr.wLength = cpu_to_le16(sizeof(u32));
 205
 206         usb_fill_control_urb(urb, usb_dev, usb_rcvctrlpipe(usb_dev, 0),
 207                              (unsigned char *)(&rd->cr), &rd->reg, sizeof(rd->reg),
 208                              rt2x00usb_register_read_async_cb, rd);
 209         if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
 210                 kfree(rd);
 211         usb_free_urb(urb);
 212 }
 213 EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async);
 214
 215 /*
 216  * TX data handlers.
 217  */
 218 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
 219 {
 220         /*
 221          * If the transfer to hardware succeeded, it does not mean the
 222          * frame was send out correctly. It only means the frame
 223          * was successfully pushed to the hardware, we have no
 224          * way to determine the transmission status right now.
 225          * (Only indirectly by looking at the failed TX counters
 226          * in the register).
 227          */
 228         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 229                 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
 230         else
 231                 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
 232 }
 233
 234 static void rt2x00usb_work_txdone(struct work_struct *work)
 235 {
 236         struct rt2x00_dev *rt2x00dev =
 237             container_of(work, struct rt2x00_dev, txdone_work);
 238         struct data_queue *queue;
 239         struct queue_entry *entry;
 240
 241         tx_queue_for_each(rt2x00dev, queue) {
 242                 while (!rt2x00queue_empty(queue)) {
 243                         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 244
 245                         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 246                             !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 247                                 break;
 248
 249                         rt2x00usb_work_txdone_entry(entry);
 250                 }
 251         }
 252 }
 253
 254 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 255 {
 256         struct queue_entry *entry = (struct queue_entry *)urb->context;
 257         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 258
 259         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 260                 return;
 261         /*
 262          * Check if the frame was correctly uploaded
 263          */
 264         if (urb->status)
 265                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 266         /*
 267          * Report the frame as DMA done
 268          */
 269         rt2x00lib_dmadone(entry);
 270
 271         if (rt2x00dev->ops->lib->tx_dma_done)
 272                 rt2x00dev->ops->lib->tx_dma_done(entry);
 273         /*
 274          * Schedule the delayed work for reading the TX status
 275          * from the device.
 276          */
 277         if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TXSTATUS_FIFO) ||
 278             !kfifo_is_empty(&rt2x00dev->txstatus_fifo))
 279                 queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
 280 }
 281
 282 static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void *data)
 283 {
 284         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 285         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 286         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 287         u32 length;
 288         int status;
 289
 290         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
 291             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 292                 return false;
 293
 294         /*
 295          * USB devices require certain padding at the end of each frame
 296          * and urb. Those paddings are not included in skbs. Pass entry
 297          * to the driver to determine what the overall length should be.
 298          */
 299         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 300
 301         status = skb_padto(entry->skb, length);
 302         if (unlikely(status)) {
 303                 /* TODO: report something more appropriate than IO_FAILED. */
 304                 rt2x00_warn(rt2x00dev, "TX SKB padding error, out of memory\n");
 305                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 306                 rt2x00lib_dmadone(entry);
 307
 308                 return false;
 309         }
 310
 311         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 312                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 313                           entry->skb->data, length,
 314                           rt2x00usb_interrupt_txdone, entry);
 315
 316         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 317         if (status) {
 318                 if (status == -ENODEV)
 319                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 320                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 321                 rt2x00lib_dmadone(entry);
 322         }
 323
 324         return false;
 325 }
 326
 327 /*
 328  * RX data handlers.
 329  */
 330 static void rt2x00usb_work_rxdone(struct work_struct *work)
 331 {
 332         struct rt2x00_dev *rt2x00dev =
 333             container_of(work, struct rt2x00_dev, rxdone_work);
 334         struct queue_entry *entry;
 335         struct skb_frame_desc *skbdesc;
 336         u8 rxd[32];
 337
 338         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 339                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 340
 341                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 342                     !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 343                         break;
 344
 345                 /*
 346                  * Fill in desc fields of the skb descriptor
 347                  */
 348                 skbdesc = get_skb_frame_desc(entry->skb);
 349                 skbdesc->desc = rxd;
 350                 skbdesc->desc_len = entry->queue->desc_size;
 351
 352                 /*
 353                  * Send the frame to rt2x00lib for further processing.
 354                  */
 355                 rt2x00lib_rxdone(entry, GFP_KERNEL);
 356         }
 357 }
 358
 359 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 360 {
 361         struct queue_entry *entry = (struct queue_entry *)urb->context;
 362         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 363
 364         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 365                 return;
 366
 367         /*
 368          * Report the frame as DMA done
 369          */
 370         rt2x00lib_dmadone(entry);
 371
 372         /*
 373          * Check if the received data is simply too small
 374          * to be actually valid, or if the urb is signaling
 375          * a problem.
 376          */
 377         if (urb->actual_length < entry->queue->desc_size || urb->status)
 378                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 379
 380         /*
 381          * Schedule the delayed work for reading the RX status
 382          * from the device.
 383          */
 384         queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
 385 }
 386
 387 static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data)
 388 {
 389         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 390         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 391         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 392         int status;
 393
 394         if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 395             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 396                 return false;
 397
 398         rt2x00lib_dmastart(entry);
 399
 400         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 401                           usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
 402                           entry->skb->data, entry->skb->len,
 403                           rt2x00usb_interrupt_rxdone, entry);
 404
 405         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 406         if (status) {
 407                 if (status == -ENODEV)
 408                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 409                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 410                 rt2x00lib_dmadone(entry);
 411         }
 412
 413         return false;
 414 }
 415
 416 void rt2x00usb_kick_queue(struct data_queue *queue)
 417 {
 418         switch (queue->qid) {
 419         case QID_AC_VO:
 420         case QID_AC_VI:
 421         case QID_AC_BE:
 422         case QID_AC_BK:
 423                 if (!rt2x00queue_empty(queue))
 424                         rt2x00queue_for_each_entry(queue,
 425                                                    Q_INDEX_DONE,
 426                                                    Q_INDEX,
 427                                                    NULL,
 428                                                    rt2x00usb_kick_tx_entry);
 429                 break;
 430         case QID_RX:
 431                 if (!rt2x00queue_full(queue))
 432                         rt2x00queue_for_each_entry(queue,
 433                                                    Q_INDEX,
 434                                                    Q_INDEX_DONE,
 435                                                    NULL,
 436                                                    rt2x00usb_kick_rx_entry);
 437                 break;
 438         default:
 439                 break;
 440         }
 441 }
 442 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
 443
 444 static bool rt2x00usb_flush_entry(struct queue_entry *entry, void *data)
 445 {
 446         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 447         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 448         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
 449
 450         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 451                 return false;
 452
 453         usb_kill_urb(entry_priv->urb);
 454
 455         /*
 456          * Kill guardian urb (if required by driver).
 457          */
 458         if ((entry->queue->qid == QID_BEACON) &&
 459             (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD)))
 460                 usb_kill_urb(bcn_priv->guardian_urb);
 461
 462         return false;
 463 }
 464
 465 void rt2x00usb_flush_queue(struct data_queue *queue, bool drop)
 466 {
 467         struct work_struct *completion;
 468         unsigned int i;
 469
 470         if (drop)
 471                 rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL,
 472                                            rt2x00usb_flush_entry);
 473
 474         /*
 475          * Obtain the queue completion handler
 476          */
 477         switch (queue->qid) {
 478         case QID_AC_VO:
 479         case QID_AC_VI:
 480         case QID_AC_BE:
 481         case QID_AC_BK:
 482                 completion = &queue->rt2x00dev->txdone_work;
 483                 break;
 484         case QID_RX:
 485                 completion = &queue->rt2x00dev->rxdone_work;
 486                 break;
 487         default:
 488                 return;
 489         }
 490
 491         for (i = 0; i < 10; i++) {
 492                 /*
 493                  * Check if the driver is already done, otherwise we
 494                  * have to sleep a little while to give the driver/hw
 495                  * the oppurtunity to complete interrupt process itself.
 496                  */
 497                 if (rt2x00queue_empty(queue))
 498                         break;
 499
 500                 /*
 501                  * Schedule the completion handler manually, when this
 502                  * worker function runs, it should cleanup the queue.
 503                  */
 504                 queue_work(queue->rt2x00dev->workqueue, completion);
 505
 506                 /*
 507                  * Wait for a little while to give the driver
 508                  * the oppurtunity to recover itself.
 509                  */
 510                 msleep(10);
 511         }
 512 }
 513 EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue);
 514
 515 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
 516 {
 517         rt2x00_warn(queue->rt2x00dev, "TX queue %d DMA timed out, invoke forced forced reset\n",
 518                     queue->qid);
 519
 520         rt2x00queue_stop_queue(queue);
 521         rt2x00queue_flush_queue(queue, true);
 522         rt2x00queue_start_queue(queue);
 523 }
 524
 525 static int rt2x00usb_dma_timeout(struct data_queue *queue)
 526 {
 527         struct queue_entry *entry;
 528
 529         entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE);
 530         return rt2x00queue_dma_timeout(entry);
 531 }
 532
 533 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 534 {
 535         struct data_queue *queue;
 536
 537         tx_queue_for_each(rt2x00dev, queue) {
 538                 if (!rt2x00queue_empty(queue)) {
 539                         if (rt2x00usb_dma_timeout(queue))
 540                                 rt2x00usb_watchdog_tx_dma(queue);
 541                 }
 542         }
 543 }
 544 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 545
 546 /*
 547  * Radio handlers
 548  */
 549 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 550 {
 551         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 552                                     REGISTER_TIMEOUT);
 553 }
 554 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 555
 556 /*
 557  * Device initialization handlers.
 558  */
 559 void rt2x00usb_clear_entry(struct queue_entry *entry)
 560 {
 561         entry->flags = 0;
 562
 563         if (entry->queue->qid == QID_RX)
 564                 rt2x00usb_kick_rx_entry(entry, NULL);
 565 }
 566 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 567
 568 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 569                                       struct usb_endpoint_descriptor *ep_desc)
 570 {
 571         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 572         int pipe;
 573
 574         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 575
 576         if (queue->qid == QID_RX) {
 577                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 578                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 579         } else {
 580                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 581                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 582         }
 583
 584         if (!queue->usb_maxpacket)
 585                 queue->usb_maxpacket = 1;
 586 }
 587
 588 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 589 {
 590         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 591         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 592         struct usb_endpoint_descriptor *ep_desc;
 593         struct data_queue *queue = rt2x00dev->tx;
 594         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 595         unsigned int i;
 596
 597         /*
 598          * Walk through all available endpoints to search for "bulk in"
 599          * and "bulk out" endpoints. When we find such endpoints collect
 600          * the information we need from the descriptor and assign it
 601          * to the queue.
 602          */
 603         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 604                 ep_desc = &intf_desc->endpoint[i].desc;
 605
 606                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 607                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 608                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 609                            (queue != queue_end(rt2x00dev))) {
 610                         rt2x00usb_assign_endpoint(queue, ep_desc);
 611                         queue = queue_next(queue);
 612
 613                         tx_ep_desc = ep_desc;
 614                 }
 615         }
 616
 617         /*
 618          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 619          */
 620         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 621                 rt2x00_err(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 622                 return -EPIPE;
 623         }
 624
 625         /*
 626          * It might be possible not all queues have a dedicated endpoint.
 627          * Loop through all TX queues and copy the endpoint information
 628          * which we have gathered from already assigned endpoints.
 629          */
 630         txall_queue_for_each(rt2x00dev, queue) {
 631                 if (!queue->usb_endpoint)
 632                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 633         }
 634
 635         return 0;
 636 }
 637
 638 static int rt2x00usb_alloc_entries(struct data_queue *queue)
 639 {
 640         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 641         struct queue_entry_priv_usb *entry_priv;
 642         struct queue_entry_priv_usb_bcn *bcn_priv;
 643         unsigned int i;
 644
 645         for (i = 0; i < queue->limit; i++) {
 646                 entry_priv = queue->entries[i].priv_data;
 647                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 648                 if (!entry_priv->urb)
 649                         return -ENOMEM;
 650         }
 651
 652         /*
 653          * If this is not the beacon queue or
 654          * no guardian byte was required for the beacon,
 655          * then we are done.
 656          */
 657         if (queue->qid != QID_BEACON ||
 658             !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))
 659                 return 0;
 660
 661         for (i = 0; i < queue->limit; i++) {
 662                 bcn_priv = queue->entries[i].priv_data;
 663                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 664                 if (!bcn_priv->guardian_urb)
 665                         return -ENOMEM;
 666         }
 667
 668         return 0;
 669 }
 670
 671 static void rt2x00usb_free_entries(struct data_queue *queue)
 672 {
 673         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 674         struct queue_entry_priv_usb *entry_priv;
 675         struct queue_entry_priv_usb_bcn *bcn_priv;
 676         unsigned int i;
 677
 678         if (!queue->entries)
 679                 return;
 680
 681         for (i = 0; i < queue->limit; i++) {
 682                 entry_priv = queue->entries[i].priv_data;
 683                 usb_kill_urb(entry_priv->urb);
 684                 usb_free_urb(entry_priv->urb);
 685         }
 686
 687         /*
 688          * If this is not the beacon queue or
 689          * no guardian byte was required for the beacon,
 690          * then we are done.
 691          */
 692         if (queue->qid != QID_BEACON ||
 693             !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))
 694                 return;
 695
 696         for (i = 0; i < queue->limit; i++) {
 697                 bcn_priv = queue->entries[i].priv_data;
 698                 usb_kill_urb(bcn_priv->guardian_urb);
 699                 usb_free_urb(bcn_priv->guardian_urb);
 700         }
 701 }
 702
 703 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 704 {
 705         struct data_queue *queue;
 706         int status;
 707
 708         /*
 709          * Find endpoints for each queue
 710          */
 711         status = rt2x00usb_find_endpoints(rt2x00dev);
 712         if (status)
 713                 goto exit;
 714
 715         /*
 716          * Allocate DMA
 717          */
 718         queue_for_each(rt2x00dev, queue) {
 719                 status = rt2x00usb_alloc_entries(queue);
 720                 if (status)
 721                         goto exit;
 722         }
 723
 724         return 0;
 725
 726 exit:
 727         rt2x00usb_uninitialize(rt2x00dev);
 728
 729         return status;
 730 }
 731 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 732
 733 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 734 {
 735         struct data_queue *queue;
 736
 737         queue_for_each(rt2x00dev, queue)
 738                 rt2x00usb_free_entries(queue);
 739 }
 740 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 741
 742 /*
 743  * USB driver handlers.
 744  */
 745 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 746 {
 747         kfree(rt2x00dev->rf);
 748         rt2x00dev->rf = NULL;
 749
 750         kfree(rt2x00dev->eeprom);
 751         rt2x00dev->eeprom = NULL;
 752
 753         kfree(rt2x00dev->csr.cache);
 754         rt2x00dev->csr.cache = NULL;
 755 }
 756
 757 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 758 {
 759         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 760         if (!rt2x00dev->csr.cache)
 761                 goto exit;
 762
 763         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 764         if (!rt2x00dev->eeprom)
 765                 goto exit;
 766
 767         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 768         if (!rt2x00dev->rf)
 769                 goto exit;
 770
 771         return 0;
 772
 773 exit:
 774         rt2x00_probe_err("Failed to allocate registers\n");
 775
 776         rt2x00usb_free_reg(rt2x00dev);
 777
 778         return -ENOMEM;
 779 }
 780
 781 int rt2x00usb_probe(struct usb_interface *usb_intf,
 782                     const struct rt2x00_ops *ops)
 783 {
 784         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 785         struct ieee80211_hw *hw;
 786         struct rt2x00_dev *rt2x00dev;
 787         int retval;
 788
 789         usb_dev = usb_get_dev(usb_dev);
 790         usb_reset_device(usb_dev);
 791
 792         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 793         if (!hw) {
 794                 rt2x00_probe_err("Failed to allocate hardware\n");
 795                 retval = -ENOMEM;
 796                 goto exit_put_device;
 797         }
 798
 799         usb_set_intfdata(usb_intf, hw);
 800
 801         rt2x00dev = hw->priv;
 802         rt2x00dev->dev = &usb_intf->dev;
 803         rt2x00dev->ops = ops;
 804         rt2x00dev->hw = hw;
 805
 806         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 807
 808         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 809         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 810         hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC,
 811                      HRTIMER_MODE_REL);
 812
 813         retval = rt2x00usb_alloc_reg(rt2x00dev);
 814         if (retval)
 815                 goto exit_free_device;
 816
 817         retval = rt2x00lib_probe_dev(rt2x00dev);
 818         if (retval)
 819                 goto exit_free_reg;
 820
 821         return 0;
 822
 823 exit_free_reg:
 824         rt2x00usb_free_reg(rt2x00dev);
 825
 826 exit_free_device:
 827         ieee80211_free_hw(hw);
 828
 829 exit_put_device:
 830         usb_put_dev(usb_dev);
 831
 832         usb_set_intfdata(usb_intf, NULL);
 833
 834         return retval;
 835 }
 836 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 837
 838 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 839 {
 840         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 841         struct rt2x00_dev *rt2x00dev = hw->priv;
 842
 843         /*
 844          * Free all allocated data.
 845          */
 846         rt2x00lib_remove_dev(rt2x00dev);
 847         rt2x00usb_free_reg(rt2x00dev);
 848         ieee80211_free_hw(hw);
 849
 850         /*
 851          * Free the USB device data.
 852          */
 853         usb_set_intfdata(usb_intf, NULL);
 854         usb_put_dev(interface_to_usbdev(usb_intf));
 855 }
 856 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 857
 858 #ifdef CONFIG_PM
 859 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 860 {
 861         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 862         struct rt2x00_dev *rt2x00dev = hw->priv;
 863
 864         return rt2x00lib_suspend(rt2x00dev, state);
 865 }
 866 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 867
 868 int rt2x00usb_resume(struct usb_interface *usb_intf)
 869 {
 870         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 871         struct rt2x00_dev *rt2x00dev = hw->priv;
 872
 873         return rt2x00lib_resume(rt2x00dev);
 874 }
 875 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 876 #endif /* CONFIG_PM */
 877
 878 /*
 879  * rt2x00usb module information.
 880  */
 881 MODULE_AUTHOR(DRV_PROJECT);
 882 MODULE_VERSION(DRV_VERSION);
 883 MODULE_DESCRIPTION("rt2x00 usb library");
 884 MODULE_LICENSE("GPL");