drivers/net/wireless/ralink/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 static bool rt2x00usb_check_usb_error(struct rt2x00_dev *rt2x00dev, int status)
  35 {
  36         if (status == -ENODEV || status == -ENOENT)
  37                 return true;
  38
  39         if (status == -EPROTO || status == -ETIMEDOUT)
  40                 rt2x00dev->num_proto_errs++;
  41         else
  42                 rt2x00dev->num_proto_errs = 0;
  43
  44         if (rt2x00dev->num_proto_errs > 3)
  45                 return true;
  46
  47         return false;
  48 }
  49
  50 /*
  51  * Interfacing with the HW.
  52  */
  53 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
  54                              const u8 request, const u8 requesttype,
  55                              const u16 offset, const u16 value,
  56                              void *buffer, const u16 buffer_length,
  57                              const int timeout)
  58 {
  59         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
  60         int status;
  61         unsigned int pipe =
  62             (requesttype == USB_VENDOR_REQUEST_IN) ?
  63             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
  64         unsigned long expire = jiffies + msecs_to_jiffies(timeout);
  65
  66         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
  67                 return -ENODEV;
  68
  69         do {
  70                 status = usb_control_msg(usb_dev, pipe, request, requesttype,
  71                                          value, offset, buffer, buffer_length,
  72                                          timeout / 2);
  73                 if (status >= 0)
  74                         return 0;
  75
  76                 if (rt2x00usb_check_usb_error(rt2x00dev, status)) {
  77                         /* Device has disappeared. */
  78                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
  79                         break;
  80                 }
  81         } while (time_before(jiffies, expire));
  82
  83         rt2x00_err(rt2x00dev,
  84                    "Vendor Request 0x%02x failed for offset 0x%04x with error %d\n",
  85                    request, offset, status);
  86
  87         return status;
  88 }
  89 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
  90
  91 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
  92                                    const u8 request, const u8 requesttype,
  93                                    const u16 offset, void *buffer,
  94                                    const u16 buffer_length, const int timeout)
  95 {
  96         int status;
  97
  98         BUG_ON(!mutex_is_locked(&rt2x00dev->csr_mutex));
  99
 100         /*
 101          * Check for Cache availability.
 102          */
 103         if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
 104                 rt2x00_err(rt2x00dev, "CSR cache not available\n");
 105                 return -ENOMEM;
 106         }
 107
 108         if (requesttype == USB_VENDOR_REQUEST_OUT)
 109                 memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
 110
 111         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
 112                                           offset, 0, rt2x00dev->csr.cache,
 113                                           buffer_length, timeout);
 114
 115         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
 116                 memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
 117
 118         return status;
 119 }
 120 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
 121
 122 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 123                                   const u8 request, const u8 requesttype,
 124                                   const u16 offset, void *buffer,
 125                                   const u16 buffer_length)
 126 {
 127         int status = 0;
 128         unsigned char *tb;
 129         u16 off, len, bsize;
 130
 131         mutex_lock(&rt2x00dev->csr_mutex);
 132
 133         tb  = (char *)buffer;
 134         off = offset;
 135         len = buffer_length;
 136         while (len && !status) {
 137                 bsize = min_t(u16, CSR_CACHE_SIZE, len);
 138                 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
 139                                                         requesttype, off, tb,
 140                                                         bsize, REGISTER_TIMEOUT);
 141
 142                 tb  += bsize;
 143                 len -= bsize;
 144                 off += bsize;
 145         }
 146
 147         mutex_unlock(&rt2x00dev->csr_mutex);
 148
 149         return status;
 150 }
 151 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 152
 153 int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
 154                            const unsigned int offset,
 155                            const struct rt2x00_field32 field,
 156                            u32 *reg)
 157 {
 158         unsigned int i;
 159
 160         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 161                 return -ENODEV;
 162
 163         for (i = 0; i < REGISTER_USB_BUSY_COUNT; i++) {
 164                 *reg = rt2x00usb_register_read_lock(rt2x00dev, offset);
 165                 if (!rt2x00_get_field32(*reg, field))
 166                         return 1;
 167                 udelay(REGISTER_BUSY_DELAY);
 168         }
 169
 170         rt2x00_err(rt2x00dev, "Indirect register access failed: offset=0x%.08x, value=0x%.08x\n",
 171                    offset, *reg);
 172         *reg = ~0;
 173
 174         return 0;
 175 }
 176 EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read);
 177
 178
 179 struct rt2x00_async_read_data {
 180         __le32 reg;
 181         struct usb_ctrlrequest cr;
 182         struct rt2x00_dev *rt2x00dev;
 183         bool (*callback)(struct rt2x00_dev *, int, u32);
 184 };
 185
 186 static void rt2x00usb_register_read_async_cb(struct urb *urb)
 187 {
 188         struct rt2x00_async_read_data *rd = urb->context;
 189         if (rd->callback(rd->rt2x00dev, urb->status, le32_to_cpu(rd->reg))) {
 190                 usb_anchor_urb(urb, rd->rt2x00dev->anchor);
 191                 if (usb_submit_urb(urb, GFP_ATOMIC) < 0) {
 192                         usb_unanchor_urb(urb);
 193                         kfree(rd);
 194                 }
 195         } else
 196                 kfree(rd);
 197 }
 198
 199 void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev,
 200                                    const unsigned int offset,
 201                                    bool (*callback)(struct rt2x00_dev*, int, u32))
 202 {
 203         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 204         struct urb *urb;
 205         struct rt2x00_async_read_data *rd;
 206
 207         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 208         if (!rd)
 209                 return;
 210
 211         urb = usb_alloc_urb(0, GFP_ATOMIC);
 212         if (!urb) {
 213                 kfree(rd);
 214                 return;
 215         }
 216
 217         rd->rt2x00dev = rt2x00dev;
 218         rd->callback = callback;
 219         rd->cr.bRequestType = USB_VENDOR_REQUEST_IN;
 220         rd->cr.bRequest = USB_MULTI_READ;
 221         rd->cr.wValue = 0;
 222         rd->cr.wIndex = cpu_to_le16(offset);
 223         rd->cr.wLength = cpu_to_le16(sizeof(u32));
 224
 225         usb_fill_control_urb(urb, usb_dev, usb_rcvctrlpipe(usb_dev, 0),
 226                              (unsigned char *)(&rd->cr), &rd->reg, sizeof(rd->reg),
 227                              rt2x00usb_register_read_async_cb, rd);
 228         usb_anchor_urb(urb, rt2x00dev->anchor);
 229         if (usb_submit_urb(urb, GFP_ATOMIC) < 0) {
 230                 usb_unanchor_urb(urb);
 231                 kfree(rd);
 232         }
 233         usb_free_urb(urb);
 234 }
 235 EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async);
 236
 237 /*
 238  * TX data handlers.
 239  */
 240 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
 241 {
 242         /*
 243          * If the transfer to hardware succeeded, it does not mean the
 244          * frame was send out correctly. It only means the frame
 245          * was successfully pushed to the hardware, we have no
 246          * way to determine the transmission status right now.
 247          * (Only indirectly by looking at the failed TX counters
 248          * in the register).
 249          */
 250         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 251                 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
 252         else
 253                 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
 254 }
 255
 256 static void rt2x00usb_work_txdone(struct work_struct *work)
 257 {
 258         struct rt2x00_dev *rt2x00dev =
 259             container_of(work, struct rt2x00_dev, txdone_work);
 260         struct data_queue *queue;
 261         struct queue_entry *entry;
 262
 263         tx_queue_for_each(rt2x00dev, queue) {
 264                 while (!rt2x00queue_empty(queue)) {
 265                         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 266
 267                         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 268                             !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 269                                 break;
 270
 271                         rt2x00usb_work_txdone_entry(entry);
 272                 }
 273         }
 274 }
 275
 276 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 277 {
 278         struct queue_entry *entry = (struct queue_entry *)urb->context;
 279         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 280
 281         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 282                 return;
 283         /*
 284          * Check if the frame was correctly uploaded
 285          */
 286         if (urb->status)
 287                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 288         /*
 289          * Report the frame as DMA done
 290          */
 291         rt2x00lib_dmadone(entry);
 292
 293         if (rt2x00dev->ops->lib->tx_dma_done)
 294                 rt2x00dev->ops->lib->tx_dma_done(entry);
 295         /*
 296          * Schedule the delayed work for reading the TX status
 297          * from the device.
 298          */
 299         if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TXSTATUS_FIFO) ||
 300             !kfifo_is_empty(&rt2x00dev->txstatus_fifo))
 301                 queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
 302 }
 303
 304 static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void *data)
 305 {
 306         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 307         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 308         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 309         u32 length;
 310         int status;
 311
 312         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
 313             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 314                 return false;
 315
 316         /*
 317          * USB devices require certain padding at the end of each frame
 318          * and urb. Those paddings are not included in skbs. Pass entry
 319          * to the driver to determine what the overall length should be.
 320          */
 321         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 322
 323         status = skb_padto(entry->skb, length);
 324         if (unlikely(status)) {
 325                 /* TODO: report something more appropriate than IO_FAILED. */
 326                 rt2x00_warn(rt2x00dev, "TX SKB padding error, out of memory\n");
 327                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 328                 rt2x00lib_dmadone(entry);
 329
 330                 return false;
 331         }
 332
 333         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 334                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 335                           entry->skb->data, length,
 336                           rt2x00usb_interrupt_txdone, entry);
 337
 338         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 339         if (status) {
 340                 if (rt2x00usb_check_usb_error(rt2x00dev, status))
 341                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 342                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 343                 rt2x00lib_dmadone(entry);
 344         }
 345
 346         return false;
 347 }
 348
 349 /*
 350  * RX data handlers.
 351  */
 352 static void rt2x00usb_work_rxdone(struct work_struct *work)
 353 {
 354         struct rt2x00_dev *rt2x00dev =
 355             container_of(work, struct rt2x00_dev, rxdone_work);
 356         struct queue_entry *entry;
 357         struct skb_frame_desc *skbdesc;
 358         u8 rxd[32];
 359
 360         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 361                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 362
 363                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 364                     !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 365                         break;
 366
 367                 /*
 368                  * Fill in desc fields of the skb descriptor
 369                  */
 370                 skbdesc = get_skb_frame_desc(entry->skb);
 371                 skbdesc->desc = rxd;
 372                 skbdesc->desc_len = entry->queue->desc_size;
 373
 374                 /*
 375                  * Send the frame to rt2x00lib for further processing.
 376                  */
 377                 rt2x00lib_rxdone(entry, GFP_KERNEL);
 378         }
 379 }
 380
 381 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 382 {
 383         struct queue_entry *entry = (struct queue_entry *)urb->context;
 384         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 385
 386         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 387                 return;
 388
 389         /*
 390          * Report the frame as DMA done
 391          */
 392         rt2x00lib_dmadone(entry);
 393
 394         /*
 395          * Check if the received data is simply too small
 396          * to be actually valid, or if the urb is signaling
 397          * a problem.
 398          */
 399         if (urb->actual_length < entry->queue->desc_size || urb->status)
 400                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 401
 402         /*
 403          * Schedule the delayed work for reading the RX status
 404          * from the device.
 405          */
 406         queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
 407 }
 408
 409 static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data)
 410 {
 411         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 412         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 413         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 414         int status;
 415
 416         if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 417             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 418                 return false;
 419
 420         rt2x00lib_dmastart(entry);
 421
 422         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 423                           usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
 424                           entry->skb->data, entry->skb->len,
 425                           rt2x00usb_interrupt_rxdone, entry);
 426
 427         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 428         if (status) {
 429                 if (rt2x00usb_check_usb_error(rt2x00dev, status))
 430                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 431                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 432                 rt2x00lib_dmadone(entry);
 433         }
 434
 435         return false;
 436 }
 437
 438 void rt2x00usb_kick_queue(struct data_queue *queue)
 439 {
 440         switch (queue->qid) {
 441         case QID_AC_VO:
 442         case QID_AC_VI:
 443         case QID_AC_BE:
 444         case QID_AC_BK:
 445                 if (!rt2x00queue_empty(queue))
 446                         rt2x00queue_for_each_entry(queue,
 447                                                    Q_INDEX_DONE,
 448                                                    Q_INDEX,
 449                                                    NULL,
 450                                                    rt2x00usb_kick_tx_entry);
 451                 break;
 452         case QID_RX:
 453                 if (!rt2x00queue_full(queue))
 454                         rt2x00queue_for_each_entry(queue,
 455                                                    Q_INDEX,
 456                                                    Q_INDEX_DONE,
 457                                                    NULL,
 458                                                    rt2x00usb_kick_rx_entry);
 459                 break;
 460         default:
 461                 break;
 462         }
 463 }
 464 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
 465
 466 static bool rt2x00usb_flush_entry(struct queue_entry *entry, void *data)
 467 {
 468         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 469         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 470         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
 471
 472         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 473                 return false;
 474
 475         usb_kill_urb(entry_priv->urb);
 476
 477         /*
 478          * Kill guardian urb (if required by driver).
 479          */
 480         if ((entry->queue->qid == QID_BEACON) &&
 481             (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD)))
 482                 usb_kill_urb(bcn_priv->guardian_urb);
 483
 484         return false;
 485 }
 486
 487 void rt2x00usb_flush_queue(struct data_queue *queue, bool drop)
 488 {
 489         struct work_struct *completion;
 490         unsigned int i;
 491
 492         if (drop)
 493                 rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL,
 494                                            rt2x00usb_flush_entry);
 495
 496         /*
 497          * Obtain the queue completion handler
 498          */
 499         switch (queue->qid) {
 500         case QID_AC_VO:
 501         case QID_AC_VI:
 502         case QID_AC_BE:
 503         case QID_AC_BK:
 504                 completion = &queue->rt2x00dev->txdone_work;
 505                 break;
 506         case QID_RX:
 507                 completion = &queue->rt2x00dev->rxdone_work;
 508                 break;
 509         default:
 510                 return;
 511         }
 512
 513         for (i = 0; i < 10; i++) {
 514                 /*
 515                  * Check if the driver is already done, otherwise we
 516                  * have to sleep a little while to give the driver/hw
 517                  * the oppurtunity to complete interrupt process itself.
 518                  */
 519                 if (rt2x00queue_empty(queue))
 520                         break;
 521
 522                 /*
 523                  * Schedule the completion handler manually, when this
 524                  * worker function runs, it should cleanup the queue.
 525                  */
 526                 queue_work(queue->rt2x00dev->workqueue, completion);
 527
 528                 /*
 529                  * Wait for a little while to give the driver
 530                  * the oppurtunity to recover itself.
 531                  */
 532                 msleep(50);
 533         }
 534 }
 535 EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue);
 536
 537 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
 538 {
 539         rt2x00_warn(queue->rt2x00dev, "TX queue %d DMA timed out, invoke forced forced reset\n",
 540                     queue->qid);
 541
 542         rt2x00queue_stop_queue(queue);
 543         rt2x00queue_flush_queue(queue, true);
 544         rt2x00queue_start_queue(queue);
 545 }
 546
 547 static int rt2x00usb_dma_timeout(struct data_queue *queue)
 548 {
 549         struct queue_entry *entry;
 550
 551         entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE);
 552         return rt2x00queue_dma_timeout(entry);
 553 }
 554
 555 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 556 {
 557         struct data_queue *queue;
 558
 559         tx_queue_for_each(rt2x00dev, queue) {
 560                 if (!rt2x00queue_empty(queue)) {
 561                         if (rt2x00usb_dma_timeout(queue))
 562                                 rt2x00usb_watchdog_tx_dma(queue);
 563                 }
 564         }
 565 }
 566 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 567
 568 /*
 569  * Radio handlers
 570  */
 571 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 572 {
 573         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 574                                     REGISTER_TIMEOUT);
 575 }
 576 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 577
 578 /*
 579  * Device initialization handlers.
 580  */
 581 void rt2x00usb_clear_entry(struct queue_entry *entry)
 582 {
 583         entry->flags = 0;
 584
 585         if (entry->queue->qid == QID_RX)
 586                 rt2x00usb_kick_rx_entry(entry, NULL);
 587 }
 588 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 589
 590 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 591                                       struct usb_endpoint_descriptor *ep_desc)
 592 {
 593         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 594         int pipe;
 595
 596         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 597
 598         if (queue->qid == QID_RX) {
 599                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 600                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 601         } else {
 602                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 603                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 604         }
 605
 606         if (!queue->usb_maxpacket)
 607                 queue->usb_maxpacket = 1;
 608 }
 609
 610 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 611 {
 612         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 613         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 614         struct usb_endpoint_descriptor *ep_desc;
 615         struct data_queue *queue = rt2x00dev->tx;
 616         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 617         unsigned int i;
 618
 619         /*
 620          * Walk through all available endpoints to search for "bulk in"
 621          * and "bulk out" endpoints. When we find such endpoints collect
 622          * the information we need from the descriptor and assign it
 623          * to the queue.
 624          */
 625         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 626                 ep_desc = &intf_desc->endpoint[i].desc;
 627
 628                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 629                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 630                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 631                            (queue != queue_end(rt2x00dev))) {
 632                         rt2x00usb_assign_endpoint(queue, ep_desc);
 633                         queue = queue_next(queue);
 634
 635                         tx_ep_desc = ep_desc;
 636                 }
 637         }
 638
 639         /*
 640          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 641          */
 642         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 643                 rt2x00_err(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 644                 return -EPIPE;
 645         }
 646
 647         /*
 648          * It might be possible not all queues have a dedicated endpoint.
 649          * Loop through all TX queues and copy the endpoint information
 650          * which we have gathered from already assigned endpoints.
 651          */
 652         txall_queue_for_each(rt2x00dev, queue) {
 653                 if (!queue->usb_endpoint)
 654                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 655         }
 656
 657         return 0;
 658 }
 659
 660 static int rt2x00usb_alloc_entries(struct data_queue *queue)
 661 {
 662         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 663         struct queue_entry_priv_usb *entry_priv;
 664         struct queue_entry_priv_usb_bcn *bcn_priv;
 665         unsigned int i;
 666
 667         for (i = 0; i < queue->limit; i++) {
 668                 entry_priv = queue->entries[i].priv_data;
 669                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 670                 if (!entry_priv->urb)
 671                         return -ENOMEM;
 672         }
 673
 674         /*
 675          * If this is not the beacon queue or
 676          * no guardian byte was required for the beacon,
 677          * then we are done.
 678          */
 679         if (queue->qid != QID_BEACON ||
 680             !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))
 681                 return 0;
 682
 683         for (i = 0; i < queue->limit; i++) {
 684                 bcn_priv = queue->entries[i].priv_data;
 685                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 686                 if (!bcn_priv->guardian_urb)
 687                         return -ENOMEM;
 688         }
 689
 690         return 0;
 691 }
 692
 693 static void rt2x00usb_free_entries(struct data_queue *queue)
 694 {
 695         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 696         struct queue_entry_priv_usb *entry_priv;
 697         struct queue_entry_priv_usb_bcn *bcn_priv;
 698         unsigned int i;
 699
 700         if (!queue->entries)
 701                 return;
 702
 703         for (i = 0; i < queue->limit; i++) {
 704                 entry_priv = queue->entries[i].priv_data;
 705                 usb_kill_urb(entry_priv->urb);
 706                 usb_free_urb(entry_priv->urb);
 707         }
 708
 709         /*
 710          * If this is not the beacon queue or
 711          * no guardian byte was required for the beacon,
 712          * then we are done.
 713          */
 714         if (queue->qid != QID_BEACON ||
 715             !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))
 716                 return;
 717
 718         for (i = 0; i < queue->limit; i++) {
 719                 bcn_priv = queue->entries[i].priv_data;
 720                 usb_kill_urb(bcn_priv->guardian_urb);
 721                 usb_free_urb(bcn_priv->guardian_urb);
 722         }
 723 }
 724
 725 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 726 {
 727         struct data_queue *queue;
 728         int status;
 729
 730         /*
 731          * Find endpoints for each queue
 732          */
 733         status = rt2x00usb_find_endpoints(rt2x00dev);
 734         if (status)
 735                 goto exit;
 736
 737         /*
 738          * Allocate DMA
 739          */
 740         queue_for_each(rt2x00dev, queue) {
 741                 status = rt2x00usb_alloc_entries(queue);
 742                 if (status)
 743                         goto exit;
 744         }
 745
 746         return 0;
 747
 748 exit:
 749         rt2x00usb_uninitialize(rt2x00dev);
 750
 751         return status;
 752 }
 753 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 754
 755 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 756 {
 757         struct data_queue *queue;
 758
 759         usb_kill_anchored_urbs(rt2x00dev->anchor);
 760         hrtimer_cancel(&rt2x00dev->txstatus_timer);
 761         cancel_work_sync(&rt2x00dev->rxdone_work);
 762         cancel_work_sync(&rt2x00dev->txdone_work);
 763
 764         queue_for_each(rt2x00dev, queue)
 765                 rt2x00usb_free_entries(queue);
 766 }
 767 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 768
 769 /*
 770  * USB driver handlers.
 771  */
 772 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 773 {
 774         kfree(rt2x00dev->rf);
 775         rt2x00dev->rf = NULL;
 776
 777         kfree(rt2x00dev->eeprom);
 778         rt2x00dev->eeprom = NULL;
 779
 780         kfree(rt2x00dev->csr.cache);
 781         rt2x00dev->csr.cache = NULL;
 782 }
 783
 784 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 785 {
 786         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 787         if (!rt2x00dev->csr.cache)
 788                 goto exit;
 789
 790         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 791         if (!rt2x00dev->eeprom)
 792                 goto exit;
 793
 794         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 795         if (!rt2x00dev->rf)
 796                 goto exit;
 797
 798         return 0;
 799
 800 exit:
 801         rt2x00_probe_err("Failed to allocate registers\n");
 802
 803         rt2x00usb_free_reg(rt2x00dev);
 804
 805         return -ENOMEM;
 806 }
 807
 808 int rt2x00usb_probe(struct usb_interface *usb_intf,
 809                     const struct rt2x00_ops *ops)
 810 {
 811         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 812         struct ieee80211_hw *hw;
 813         struct rt2x00_dev *rt2x00dev;
 814         int retval;
 815
 816         usb_dev = usb_get_dev(usb_dev);
 817         usb_reset_device(usb_dev);
 818
 819         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 820         if (!hw) {
 821                 rt2x00_probe_err("Failed to allocate hardware\n");
 822                 retval = -ENOMEM;
 823                 goto exit_put_device;
 824         }
 825
 826         usb_set_intfdata(usb_intf, hw);
 827
 828         rt2x00dev = hw->priv;
 829         rt2x00dev->dev = &usb_intf->dev;
 830         rt2x00dev->ops = ops;
 831         rt2x00dev->hw = hw;
 832
 833         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 834
 835         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 836         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 837         hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC,
 838                      HRTIMER_MODE_REL);
 839
 840         retval = rt2x00usb_alloc_reg(rt2x00dev);
 841         if (retval)
 842                 goto exit_free_device;
 843
 844         rt2x00dev->anchor = devm_kmalloc(&usb_dev->dev,
 845                                         sizeof(struct usb_anchor),
 846                                         GFP_KERNEL);
 847         if (!rt2x00dev->anchor) {
 848                 retval = -ENOMEM;
 849                 goto exit_free_reg;
 850         }
 851         init_usb_anchor(rt2x00dev->anchor);
 852
 853         retval = rt2x00lib_probe_dev(rt2x00dev);
 854         if (retval)
 855                 goto exit_free_anchor;
 856
 857         return 0;
 858
 859 exit_free_anchor:
 860         usb_kill_anchored_urbs(rt2x00dev->anchor);
 861
 862 exit_free_reg:
 863         rt2x00usb_free_reg(rt2x00dev);
 864
 865 exit_free_device:
 866         ieee80211_free_hw(hw);
 867
 868 exit_put_device:
 869         usb_put_dev(usb_dev);
 870
 871         usb_set_intfdata(usb_intf, NULL);
 872
 873         return retval;
 874 }
 875 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 876
 877 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 878 {
 879         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 880         struct rt2x00_dev *rt2x00dev = hw->priv;
 881
 882         /*
 883          * Free all allocated data.
 884          */
 885         rt2x00lib_remove_dev(rt2x00dev);
 886         rt2x00usb_free_reg(rt2x00dev);
 887         ieee80211_free_hw(hw);
 888
 889         /*
 890          * Free the USB device data.
 891          */
 892         usb_set_intfdata(usb_intf, NULL);
 893         usb_put_dev(interface_to_usbdev(usb_intf));
 894 }
 895 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 896
 897 #ifdef CONFIG_PM
 898 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 899 {
 900         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 901         struct rt2x00_dev *rt2x00dev = hw->priv;
 902
 903         return rt2x00lib_suspend(rt2x00dev, state);
 904 }
 905 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 906
 907 int rt2x00usb_resume(struct usb_interface *usb_intf)
 908 {
 909         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 910         struct rt2x00_dev *rt2x00dev = hw->priv;
 911
 912         return rt2x00lib_resume(rt2x00dev);
 913 }
 914 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 915 #endif /* CONFIG_PM */
 916
 917 /*
 918  * rt2x00usb module information.
 919  */
 920 MODULE_AUTHOR(DRV_PROJECT);
 921 MODULE_VERSION(DRV_VERSION);
 922 MODULE_DESCRIPTION("rt2x00 usb library");
 923 MODULE_LICENSE("GPL");