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 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         /* If the port is powered down, we get a -EPROTO error, and this
  72          * leads to a endless loop. So just say that the device is gone.
  73          */
  74         if (status == -EPROTO)
  75                 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
  76
  77         rt2x00_err(rt2x00dev,
  78                    "Vendor Request 0x%02x failed for offset 0x%04x with error %d\n",
  79                    request, offset, status);
  80
  81         return status;
  82 }
  83 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
  84
  85 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
  86                                    const u8 request, const u8 requesttype,
  87                                    const u16 offset, void *buffer,
  88                                    const u16 buffer_length, const int timeout)
  89 {
  90         int status;
  91
  92         BUG_ON(!mutex_is_locked(&rt2x00dev->csr_mutex));
  93
  94         /*
  95          * Check for Cache availability.
  96          */
  97         if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
  98                 rt2x00_err(rt2x00dev, "CSR cache not available\n");
  99                 return -ENOMEM;
 100         }
 101
 102         if (requesttype == USB_VENDOR_REQUEST_OUT)
 103                 memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
 104
 105         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
 106                                           offset, 0, rt2x00dev->csr.cache,
 107                                           buffer_length, timeout);
 108
 109         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
 110                 memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
 111
 112         return status;
 113 }
 114 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
 115
 116 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 117                                   const u8 request, const u8 requesttype,
 118                                   const u16 offset, void *buffer,
 119                                   const u16 buffer_length, const int timeout)
 120 {
 121         int status = 0;
 122         unsigned char *tb;
 123         u16 off, len, bsize;
 124
 125         mutex_lock(&rt2x00dev->csr_mutex);
 126
 127         tb  = (char *)buffer;
 128         off = offset;
 129         len = buffer_length;
 130         while (len && !status) {
 131                 bsize = min_t(u16, CSR_CACHE_SIZE, len);
 132                 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
 133                                                         requesttype, off, tb,
 134                                                         bsize, timeout);
 135
 136                 tb  += bsize;
 137                 len -= bsize;
 138                 off += bsize;
 139         }
 140
 141         mutex_unlock(&rt2x00dev->csr_mutex);
 142
 143         return status;
 144 }
 145 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 146
 147 int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
 148                            const unsigned int offset,
 149                            const struct rt2x00_field32 field,
 150                            u32 *reg)
 151 {
 152         unsigned int i;
 153
 154         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 155                 return -ENODEV;
 156
 157         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
 158                 rt2x00usb_register_read_lock(rt2x00dev, offset, reg);
 159                 if (!rt2x00_get_field32(*reg, field))
 160                         return 1;
 161                 udelay(REGISTER_BUSY_DELAY);
 162         }
 163
 164         rt2x00_err(rt2x00dev, "Indirect register access failed: offset=0x%.08x, value=0x%.08x\n",
 165                    offset, *reg);
 166         *reg = ~0;
 167
 168         return 0;
 169 }
 170 EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read);
 171
 172
 173 struct rt2x00_async_read_data {
 174         __le32 reg;
 175         struct usb_ctrlrequest cr;
 176         struct rt2x00_dev *rt2x00dev;
 177         bool (*callback)(struct rt2x00_dev *, int, u32);
 178 };
 179
 180 static void rt2x00usb_register_read_async_cb(struct urb *urb)
 181 {
 182         struct rt2x00_async_read_data *rd = urb->context;
 183         if (rd->callback(rd->rt2x00dev, urb->status, le32_to_cpu(rd->reg))) {
 184                 if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
 185                         kfree(rd);
 186         } else
 187                 kfree(rd);
 188 }
 189
 190 void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev,
 191                                    const unsigned int offset,
 192                                    bool (*callback)(struct rt2x00_dev*, int, u32))
 193 {
 194         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 195         struct urb *urb;
 196         struct rt2x00_async_read_data *rd;
 197
 198         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 199         if (!rd)
 200                 return;
 201
 202         urb = usb_alloc_urb(0, GFP_ATOMIC);
 203         if (!urb) {
 204                 kfree(rd);
 205                 return;
 206         }
 207
 208         rd->rt2x00dev = rt2x00dev;
 209         rd->callback = callback;
 210         rd->cr.bRequestType = USB_VENDOR_REQUEST_IN;
 211         rd->cr.bRequest = USB_MULTI_READ;
 212         rd->cr.wValue = 0;
 213         rd->cr.wIndex = cpu_to_le16(offset);
 214         rd->cr.wLength = cpu_to_le16(sizeof(u32));
 215
 216         usb_fill_control_urb(urb, usb_dev, usb_rcvctrlpipe(usb_dev, 0),
 217                              (unsigned char *)(&rd->cr), &rd->reg, sizeof(rd->reg),
 218                              rt2x00usb_register_read_async_cb, rd);
 219         if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
 220                 kfree(rd);
 221         usb_free_urb(urb);
 222 }
 223 EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async);
 224
 225 /*
 226  * TX data handlers.
 227  */
 228 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
 229 {
 230         /*
 231          * If the transfer to hardware succeeded, it does not mean the
 232          * frame was send out correctly. It only means the frame
 233          * was successfully pushed to the hardware, we have no
 234          * way to determine the transmission status right now.
 235          * (Only indirectly by looking at the failed TX counters
 236          * in the register).
 237          */
 238         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 239                 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
 240         else
 241                 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
 242 }
 243
 244 static void rt2x00usb_work_txdone(struct work_struct *work)
 245 {
 246         struct rt2x00_dev *rt2x00dev =
 247             container_of(work, struct rt2x00_dev, txdone_work);
 248         struct data_queue *queue;
 249         struct queue_entry *entry;
 250
 251         tx_queue_for_each(rt2x00dev, queue) {
 252                 while (!rt2x00queue_empty(queue)) {
 253                         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 254
 255                         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 256                             !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 257                                 break;
 258
 259                         rt2x00usb_work_txdone_entry(entry);
 260                 }
 261         }
 262 }
 263
 264 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 265 {
 266         struct queue_entry *entry = (struct queue_entry *)urb->context;
 267         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 268
 269         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 270                 return;
 271         /*
 272          * Check if the frame was correctly uploaded
 273          */
 274         if (urb->status)
 275                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 276         /*
 277          * Report the frame as DMA done
 278          */
 279         rt2x00lib_dmadone(entry);
 280
 281         if (rt2x00dev->ops->lib->tx_dma_done)
 282                 rt2x00dev->ops->lib->tx_dma_done(entry);
 283         /*
 284          * Schedule the delayed work for reading the TX status
 285          * from the device.
 286          */
 287         if (!test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags) ||
 288             !kfifo_is_empty(&rt2x00dev->txstatus_fifo))
 289                 queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
 290 }
 291
 292 static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void *data)
 293 {
 294         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 295         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 296         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 297         u32 length;
 298         int status;
 299
 300         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
 301             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 302                 return false;
 303
 304         /*
 305          * USB devices require certain padding at the end of each frame
 306          * and urb. Those paddings are not included in skbs. Pass entry
 307          * to the driver to determine what the overall length should be.
 308          */
 309         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 310
 311         status = skb_padto(entry->skb, length);
 312         if (unlikely(status)) {
 313                 /* TODO: report something more appropriate than IO_FAILED. */
 314                 rt2x00_warn(rt2x00dev, "TX SKB padding error, out of memory\n");
 315                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 316                 rt2x00lib_dmadone(entry);
 317
 318                 return false;
 319         }
 320
 321         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 322                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 323                           entry->skb->data, length,
 324                           rt2x00usb_interrupt_txdone, entry);
 325
 326         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 327         if (status) {
 328                 if (status == -ENODEV)
 329                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 330                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 331                 rt2x00lib_dmadone(entry);
 332         }
 333
 334         return false;
 335 }
 336
 337 /*
 338  * RX data handlers.
 339  */
 340 static void rt2x00usb_work_rxdone(struct work_struct *work)
 341 {
 342         struct rt2x00_dev *rt2x00dev =
 343             container_of(work, struct rt2x00_dev, rxdone_work);
 344         struct queue_entry *entry;
 345         struct skb_frame_desc *skbdesc;
 346         u8 rxd[32];
 347
 348         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 349                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 350
 351                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 352                     !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 353                         break;
 354
 355                 /*
 356                  * Fill in desc fields of the skb descriptor
 357                  */
 358                 skbdesc = get_skb_frame_desc(entry->skb);
 359                 skbdesc->desc = rxd;
 360                 skbdesc->desc_len = entry->queue->desc_size;
 361
 362                 /*
 363                  * Send the frame to rt2x00lib for further processing.
 364                  */
 365                 rt2x00lib_rxdone(entry, GFP_KERNEL);
 366         }
 367 }
 368
 369 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 370 {
 371         struct queue_entry *entry = (struct queue_entry *)urb->context;
 372         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 373
 374         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 375                 return;
 376
 377         /*
 378          * Report the frame as DMA done
 379          */
 380         rt2x00lib_dmadone(entry);
 381
 382         /*
 383          * Check if the received data is simply too small
 384          * to be actually valid, or if the urb is signaling
 385          * a problem.
 386          */
 387         if (urb->actual_length < entry->queue->desc_size || urb->status)
 388                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 389
 390         /*
 391          * Schedule the delayed work for reading the RX status
 392          * from the device.
 393          */
 394         queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
 395 }
 396
 397 static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data)
 398 {
 399         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 400         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 401         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 402         int status;
 403
 404         if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 405             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 406                 return false;
 407
 408         rt2x00lib_dmastart(entry);
 409
 410         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 411                           usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
 412                           entry->skb->data, entry->skb->len,
 413                           rt2x00usb_interrupt_rxdone, entry);
 414
 415         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 416         if (status) {
 417                 if (status == -ENODEV)
 418                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 419                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 420                 rt2x00lib_dmadone(entry);
 421         }
 422
 423         return false;
 424 }
 425
 426 void rt2x00usb_kick_queue(struct data_queue *queue)
 427 {
 428         switch (queue->qid) {
 429         case QID_AC_VO:
 430         case QID_AC_VI:
 431         case QID_AC_BE:
 432         case QID_AC_BK:
 433                 if (!rt2x00queue_empty(queue))
 434                         rt2x00queue_for_each_entry(queue,
 435                                                    Q_INDEX_DONE,
 436                                                    Q_INDEX,
 437                                                    NULL,
 438                                                    rt2x00usb_kick_tx_entry);
 439                 break;
 440         case QID_RX:
 441                 if (!rt2x00queue_full(queue))
 442                         rt2x00queue_for_each_entry(queue,
 443                                                    Q_INDEX,
 444                                                    Q_INDEX_DONE,
 445                                                    NULL,
 446                                                    rt2x00usb_kick_rx_entry);
 447                 break;
 448         default:
 449                 break;
 450         }
 451 }
 452 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
 453
 454 static bool rt2x00usb_flush_entry(struct queue_entry *entry, void *data)
 455 {
 456         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 457         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 458         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
 459
 460         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 461                 return false;
 462
 463         usb_kill_urb(entry_priv->urb);
 464
 465         /*
 466          * Kill guardian urb (if required by driver).
 467          */
 468         if ((entry->queue->qid == QID_BEACON) &&
 469             (test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags)))
 470                 usb_kill_urb(bcn_priv->guardian_urb);
 471
 472         return false;
 473 }
 474
 475 void rt2x00usb_flush_queue(struct data_queue *queue, bool drop)
 476 {
 477         struct work_struct *completion;
 478         unsigned int i;
 479
 480         if (drop)
 481                 rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL,
 482                                            rt2x00usb_flush_entry);
 483
 484         /*
 485          * Obtain the queue completion handler
 486          */
 487         switch (queue->qid) {
 488         case QID_AC_VO:
 489         case QID_AC_VI:
 490         case QID_AC_BE:
 491         case QID_AC_BK:
 492                 completion = &queue->rt2x00dev->txdone_work;
 493                 break;
 494         case QID_RX:
 495                 completion = &queue->rt2x00dev->rxdone_work;
 496                 break;
 497         default:
 498                 return;
 499         }
 500
 501         for (i = 0; i < 10; i++) {
 502                 /*
 503                  * Check if the driver is already done, otherwise we
 504                  * have to sleep a little while to give the driver/hw
 505                  * the oppurtunity to complete interrupt process itself.
 506                  */
 507                 if (rt2x00queue_empty(queue))
 508                         break;
 509
 510                 /*
 511                  * Schedule the completion handler manually, when this
 512                  * worker function runs, it should cleanup the queue.
 513                  */
 514                 queue_work(queue->rt2x00dev->workqueue, completion);
 515
 516                 /*
 517                  * Wait for a little while to give the driver
 518                  * the oppurtunity to recover itself.
 519                  */
 520                 msleep(10);
 521         }
 522 }
 523 EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue);
 524
 525 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
 526 {
 527         rt2x00_warn(queue->rt2x00dev, "TX queue %d DMA timed out, invoke forced forced reset\n",
 528                     queue->qid);
 529
 530         rt2x00queue_stop_queue(queue);
 531         rt2x00queue_flush_queue(queue, true);
 532         rt2x00queue_start_queue(queue);
 533 }
 534
 535 static int rt2x00usb_dma_timeout(struct data_queue *queue)
 536 {
 537         struct queue_entry *entry;
 538
 539         entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE);
 540         return rt2x00queue_dma_timeout(entry);
 541 }
 542
 543 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 544 {
 545         struct data_queue *queue;
 546
 547         tx_queue_for_each(rt2x00dev, queue) {
 548                 if (!rt2x00queue_empty(queue)) {
 549                         if (rt2x00usb_dma_timeout(queue))
 550                                 rt2x00usb_watchdog_tx_dma(queue);
 551                 }
 552         }
 553 }
 554 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 555
 556 /*
 557  * Radio handlers
 558  */
 559 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 560 {
 561         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 562                                     REGISTER_TIMEOUT);
 563 }
 564 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 565
 566 /*
 567  * Device initialization handlers.
 568  */
 569 void rt2x00usb_clear_entry(struct queue_entry *entry)
 570 {
 571         entry->flags = 0;
 572
 573         if (entry->queue->qid == QID_RX)
 574                 rt2x00usb_kick_rx_entry(entry, NULL);
 575 }
 576 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 577
 578 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 579                                       struct usb_endpoint_descriptor *ep_desc)
 580 {
 581         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 582         int pipe;
 583
 584         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 585
 586         if (queue->qid == QID_RX) {
 587                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 588                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 589         } else {
 590                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 591                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 592         }
 593
 594         if (!queue->usb_maxpacket)
 595                 queue->usb_maxpacket = 1;
 596 }
 597
 598 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 599 {
 600         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 601         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 602         struct usb_endpoint_descriptor *ep_desc;
 603         struct data_queue *queue = rt2x00dev->tx;
 604         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 605         unsigned int i;
 606
 607         /*
 608          * Walk through all available endpoints to search for "bulk in"
 609          * and "bulk out" endpoints. When we find such endpoints collect
 610          * the information we need from the descriptor and assign it
 611          * to the queue.
 612          */
 613         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 614                 ep_desc = &intf_desc->endpoint[i].desc;
 615
 616                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 617                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 618                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 619                            (queue != queue_end(rt2x00dev))) {
 620                         rt2x00usb_assign_endpoint(queue, ep_desc);
 621                         queue = queue_next(queue);
 622
 623                         tx_ep_desc = ep_desc;
 624                 }
 625         }
 626
 627         /*
 628          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 629          */
 630         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 631                 rt2x00_err(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 632                 return -EPIPE;
 633         }
 634
 635         /*
 636          * It might be possible not all queues have a dedicated endpoint.
 637          * Loop through all TX queues and copy the endpoint information
 638          * which we have gathered from already assigned endpoints.
 639          */
 640         txall_queue_for_each(rt2x00dev, queue) {
 641                 if (!queue->usb_endpoint)
 642                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 643         }
 644
 645         return 0;
 646 }
 647
 648 static int rt2x00usb_alloc_entries(struct data_queue *queue)
 649 {
 650         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 651         struct queue_entry_priv_usb *entry_priv;
 652         struct queue_entry_priv_usb_bcn *bcn_priv;
 653         unsigned int i;
 654
 655         for (i = 0; i < queue->limit; i++) {
 656                 entry_priv = queue->entries[i].priv_data;
 657                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 658                 if (!entry_priv->urb)
 659                         return -ENOMEM;
 660         }
 661
 662         /*
 663          * If this is not the beacon queue or
 664          * no guardian byte was required for the beacon,
 665          * then we are done.
 666          */
 667         if (queue->qid != QID_BEACON ||
 668             !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
 669                 return 0;
 670
 671         for (i = 0; i < queue->limit; i++) {
 672                 bcn_priv = queue->entries[i].priv_data;
 673                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 674                 if (!bcn_priv->guardian_urb)
 675                         return -ENOMEM;
 676         }
 677
 678         return 0;
 679 }
 680
 681 static void rt2x00usb_free_entries(struct data_queue *queue)
 682 {
 683         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 684         struct queue_entry_priv_usb *entry_priv;
 685         struct queue_entry_priv_usb_bcn *bcn_priv;
 686         unsigned int i;
 687
 688         if (!queue->entries)
 689                 return;
 690
 691         for (i = 0; i < queue->limit; i++) {
 692                 entry_priv = queue->entries[i].priv_data;
 693                 usb_kill_urb(entry_priv->urb);
 694                 usb_free_urb(entry_priv->urb);
 695         }
 696
 697         /*
 698          * If this is not the beacon queue or
 699          * no guardian byte was required for the beacon,
 700          * then we are done.
 701          */
 702         if (queue->qid != QID_BEACON ||
 703             !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
 704                 return;
 705
 706         for (i = 0; i < queue->limit; i++) {
 707                 bcn_priv = queue->entries[i].priv_data;
 708                 usb_kill_urb(bcn_priv->guardian_urb);
 709                 usb_free_urb(bcn_priv->guardian_urb);
 710         }
 711 }
 712
 713 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 714 {
 715         struct data_queue *queue;
 716         int status;
 717
 718         /*
 719          * Find endpoints for each queue
 720          */
 721         status = rt2x00usb_find_endpoints(rt2x00dev);
 722         if (status)
 723                 goto exit;
 724
 725         /*
 726          * Allocate DMA
 727          */
 728         queue_for_each(rt2x00dev, queue) {
 729                 status = rt2x00usb_alloc_entries(queue);
 730                 if (status)
 731                         goto exit;
 732         }
 733
 734         return 0;
 735
 736 exit:
 737         rt2x00usb_uninitialize(rt2x00dev);
 738
 739         return status;
 740 }
 741 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 742
 743 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 744 {
 745         struct data_queue *queue;
 746
 747         queue_for_each(rt2x00dev, queue)
 748                 rt2x00usb_free_entries(queue);
 749 }
 750 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 751
 752 /*
 753  * USB driver handlers.
 754  */
 755 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 756 {
 757         kfree(rt2x00dev->rf);
 758         rt2x00dev->rf = NULL;
 759
 760         kfree(rt2x00dev->eeprom);
 761         rt2x00dev->eeprom = NULL;
 762
 763         kfree(rt2x00dev->csr.cache);
 764         rt2x00dev->csr.cache = NULL;
 765 }
 766
 767 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 768 {
 769         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 770         if (!rt2x00dev->csr.cache)
 771                 goto exit;
 772
 773         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 774         if (!rt2x00dev->eeprom)
 775                 goto exit;
 776
 777         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 778         if (!rt2x00dev->rf)
 779                 goto exit;
 780
 781         return 0;
 782
 783 exit:
 784         rt2x00_probe_err("Failed to allocate registers\n");
 785
 786         rt2x00usb_free_reg(rt2x00dev);
 787
 788         return -ENOMEM;
 789 }
 790
 791 int rt2x00usb_probe(struct usb_interface *usb_intf,
 792                     const struct rt2x00_ops *ops)
 793 {
 794         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 795         struct ieee80211_hw *hw;
 796         struct rt2x00_dev *rt2x00dev;
 797         int retval;
 798
 799         usb_dev = usb_get_dev(usb_dev);
 800         usb_reset_device(usb_dev);
 801
 802         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 803         if (!hw) {
 804                 rt2x00_probe_err("Failed to allocate hardware\n");
 805                 retval = -ENOMEM;
 806                 goto exit_put_device;
 807         }
 808
 809         usb_set_intfdata(usb_intf, hw);
 810
 811         rt2x00dev = hw->priv;
 812         rt2x00dev->dev = &usb_intf->dev;
 813         rt2x00dev->ops = ops;
 814         rt2x00dev->hw = hw;
 815
 816         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 817
 818         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 819         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 820         hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC,
 821                      HRTIMER_MODE_REL);
 822
 823         retval = rt2x00usb_alloc_reg(rt2x00dev);
 824         if (retval)
 825                 goto exit_free_device;
 826
 827         retval = rt2x00lib_probe_dev(rt2x00dev);
 828         if (retval)
 829                 goto exit_free_reg;
 830
 831         return 0;
 832
 833 exit_free_reg:
 834         rt2x00usb_free_reg(rt2x00dev);
 835
 836 exit_free_device:
 837         ieee80211_free_hw(hw);
 838
 839 exit_put_device:
 840         usb_put_dev(usb_dev);
 841
 842         usb_set_intfdata(usb_intf, NULL);
 843
 844         return retval;
 845 }
 846 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 847
 848 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 849 {
 850         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 851         struct rt2x00_dev *rt2x00dev = hw->priv;
 852
 853         /*
 854          * Free all allocated data.
 855          */
 856         rt2x00lib_remove_dev(rt2x00dev);
 857         rt2x00usb_free_reg(rt2x00dev);
 858         ieee80211_free_hw(hw);
 859
 860         /*
 861          * Free the USB device data.
 862          */
 863         usb_set_intfdata(usb_intf, NULL);
 864         usb_put_dev(interface_to_usbdev(usb_intf));
 865 }
 866 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 867
 868 #ifdef CONFIG_PM
 869 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 870 {
 871         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 872         struct rt2x00_dev *rt2x00dev = hw->priv;
 873
 874         return rt2x00lib_suspend(rt2x00dev, state);
 875 }
 876 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 877
 878 int rt2x00usb_resume(struct usb_interface *usb_intf)
 879 {
 880         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 881         struct rt2x00_dev *rt2x00dev = hw->priv;
 882
 883         return rt2x00lib_resume(rt2x00dev);
 884 }
 885 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 886 #endif /* CONFIG_PM */
 887
 888 /*
 889  * rt2x00usb module information.
 890  */
 891 MODULE_AUTHOR(DRV_PROJECT);
 892 MODULE_VERSION(DRV_VERSION);
 893 MODULE_DESCRIPTION("rt2x00 usb library");
 894 MODULE_LICENSE("GPL");