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 /*
  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                 usb_anchor_urb(urb, rd->rt2x00dev->anchor);
 175                 if (usb_submit_urb(urb, GFP_ATOMIC) < 0) {
 176                         usb_unanchor_urb(urb);
 177                         kfree(rd);
 178                 }
 179         } else
 180                 kfree(rd);
 181 }
 182
 183 void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev,
 184                                    const unsigned int offset,
 185                                    bool (*callback)(struct rt2x00_dev*, int, u32))
 186 {
 187         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 188         struct urb *urb;
 189         struct rt2x00_async_read_data *rd;
 190
 191         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 192         if (!rd)
 193                 return;
 194
 195         urb = usb_alloc_urb(0, GFP_ATOMIC);
 196         if (!urb) {
 197                 kfree(rd);
 198                 return;
 199         }
 200
 201         rd->rt2x00dev = rt2x00dev;
 202         rd->callback = callback;
 203         rd->cr.bRequestType = USB_VENDOR_REQUEST_IN;
 204         rd->cr.bRequest = USB_MULTI_READ;
 205         rd->cr.wValue = 0;
 206         rd->cr.wIndex = cpu_to_le16(offset);
 207         rd->cr.wLength = cpu_to_le16(sizeof(u32));
 208
 209         usb_fill_control_urb(urb, usb_dev, usb_rcvctrlpipe(usb_dev, 0),
 210                              (unsigned char *)(&rd->cr), &rd->reg, sizeof(rd->reg),
 211                              rt2x00usb_register_read_async_cb, rd);
 212         usb_anchor_urb(urb, rt2x00dev->anchor);
 213         if (usb_submit_urb(urb, GFP_ATOMIC) < 0) {
 214                 usb_unanchor_urb(urb);
 215                 kfree(rd);
 216         }
 217         usb_free_urb(urb);
 218 }
 219 EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async);
 220
 221 /*
 222  * TX data handlers.
 223  */
 224 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
 225 {
 226         /*
 227          * If the transfer to hardware succeeded, it does not mean the
 228          * frame was send out correctly. It only means the frame
 229          * was successfully pushed to the hardware, we have no
 230          * way to determine the transmission status right now.
 231          * (Only indirectly by looking at the failed TX counters
 232          * in the register).
 233          */
 234         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 235                 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
 236         else
 237                 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
 238 }
 239
 240 static void rt2x00usb_work_txdone(struct work_struct *work)
 241 {
 242         struct rt2x00_dev *rt2x00dev =
 243             container_of(work, struct rt2x00_dev, txdone_work);
 244         struct data_queue *queue;
 245         struct queue_entry *entry;
 246
 247         tx_queue_for_each(rt2x00dev, queue) {
 248                 while (!rt2x00queue_empty(queue)) {
 249                         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 250
 251                         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 252                             !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 253                                 break;
 254
 255                         rt2x00usb_work_txdone_entry(entry);
 256                 }
 257         }
 258 }
 259
 260 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 261 {
 262         struct queue_entry *entry = (struct queue_entry *)urb->context;
 263         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 264
 265         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 266                 return;
 267         /*
 268          * Check if the frame was correctly uploaded
 269          */
 270         if (urb->status)
 271                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 272         /*
 273          * Report the frame as DMA done
 274          */
 275         rt2x00lib_dmadone(entry);
 276
 277         if (rt2x00dev->ops->lib->tx_dma_done)
 278                 rt2x00dev->ops->lib->tx_dma_done(entry);
 279         /*
 280          * Schedule the delayed work for reading the TX status
 281          * from the device.
 282          */
 283         if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TXSTATUS_FIFO) ||
 284             !kfifo_is_empty(&rt2x00dev->txstatus_fifo))
 285                 queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
 286 }
 287
 288 static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void *data)
 289 {
 290         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 291         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 292         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 293         u32 length;
 294         int status;
 295
 296         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
 297             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 298                 return false;
 299
 300         /*
 301          * USB devices require certain padding at the end of each frame
 302          * and urb. Those paddings are not included in skbs. Pass entry
 303          * to the driver to determine what the overall length should be.
 304          */
 305         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 306
 307         status = skb_padto(entry->skb, length);
 308         if (unlikely(status)) {
 309                 /* TODO: report something more appropriate than IO_FAILED. */
 310                 rt2x00_warn(rt2x00dev, "TX SKB padding error, out of memory\n");
 311                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 312                 rt2x00lib_dmadone(entry);
 313
 314                 return false;
 315         }
 316
 317         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 318                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 319                           entry->skb->data, length,
 320                           rt2x00usb_interrupt_txdone, entry);
 321
 322         usb_anchor_urb(entry_priv->urb, rt2x00dev->anchor);
 323         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 324         if (status) {
 325                 usb_unanchor_urb(entry_priv->urb);
 326                 if (status == -ENODEV)
 327                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 328                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 329                 rt2x00lib_dmadone(entry);
 330         }
 331
 332         return false;
 333 }
 334
 335 /*
 336  * RX data handlers.
 337  */
 338 static void rt2x00usb_work_rxdone(struct work_struct *work)
 339 {
 340         struct rt2x00_dev *rt2x00dev =
 341             container_of(work, struct rt2x00_dev, rxdone_work);
 342         struct queue_entry *entry;
 343         struct skb_frame_desc *skbdesc;
 344         u8 rxd[32];
 345
 346         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 347                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 348
 349                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 350                     !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 351                         break;
 352
 353                 /*
 354                  * Fill in desc fields of the skb descriptor
 355                  */
 356                 skbdesc = get_skb_frame_desc(entry->skb);
 357                 skbdesc->desc = rxd;
 358                 skbdesc->desc_len = entry->queue->desc_size;
 359
 360                 /*
 361                  * Send the frame to rt2x00lib for further processing.
 362                  */
 363                 rt2x00lib_rxdone(entry, GFP_KERNEL);
 364         }
 365 }
 366
 367 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 368 {
 369         struct queue_entry *entry = (struct queue_entry *)urb->context;
 370         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 371
 372         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 373                 return;
 374
 375         /*
 376          * Report the frame as DMA done
 377          */
 378         rt2x00lib_dmadone(entry);
 379
 380         /*
 381          * Check if the received data is simply too small
 382          * to be actually valid, or if the urb is signaling
 383          * a problem.
 384          */
 385         if (urb->actual_length < entry->queue->desc_size || urb->status)
 386                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 387
 388         /*
 389          * Schedule the delayed work for reading the RX status
 390          * from the device.
 391          */
 392         queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
 393 }
 394
 395 static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data)
 396 {
 397         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 398         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 399         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 400         int status;
 401
 402         if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 403             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 404                 return false;
 405
 406         rt2x00lib_dmastart(entry);
 407
 408         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 409                           usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
 410                           entry->skb->data, entry->skb->len,
 411                           rt2x00usb_interrupt_rxdone, entry);
 412
 413         usb_anchor_urb(entry_priv->urb, rt2x00dev->anchor);
 414         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 415         if (status) {
 416                 usb_unanchor_urb(entry_priv->urb);
 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             (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD)))
 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             !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))
 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             !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))
 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         rt2x00dev->anchor = devm_kmalloc(&usb_dev->dev,
 832                                         sizeof(struct usb_anchor),
 833                                         GFP_KERNEL);
 834         if (!rt2x00dev->anchor) {
 835                 retval = -ENOMEM;
 836                 goto exit_free_reg;
 837         }
 838
 839         init_usb_anchor(rt2x00dev->anchor);
 840         return 0;
 841
 842 exit_free_reg:
 843         rt2x00usb_free_reg(rt2x00dev);
 844
 845 exit_free_device:
 846         ieee80211_free_hw(hw);
 847
 848 exit_put_device:
 849         usb_put_dev(usb_dev);
 850
 851         usb_set_intfdata(usb_intf, NULL);
 852
 853         return retval;
 854 }
 855 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 856
 857 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 858 {
 859         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 860         struct rt2x00_dev *rt2x00dev = hw->priv;
 861
 862         /*
 863          * Free all allocated data.
 864          */
 865         rt2x00lib_remove_dev(rt2x00dev);
 866         rt2x00usb_free_reg(rt2x00dev);
 867         ieee80211_free_hw(hw);
 868
 869         /*
 870          * Free the USB device data.
 871          */
 872         usb_set_intfdata(usb_intf, NULL);
 873         usb_put_dev(interface_to_usbdev(usb_intf));
 874 }
 875 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 876
 877 #ifdef CONFIG_PM
 878 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 879 {
 880         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 881         struct rt2x00_dev *rt2x00dev = hw->priv;
 882
 883         return rt2x00lib_suspend(rt2x00dev, state);
 884 }
 885 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 886
 887 int rt2x00usb_resume(struct usb_interface *usb_intf)
 888 {
 889         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 890         struct rt2x00_dev *rt2x00dev = hw->priv;
 891
 892         return rt2x00lib_resume(rt2x00dev);
 893 }
 894 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 895 #endif /* CONFIG_PM */
 896
 897 /*
 898  * rt2x00usb module information.
 899  */
 900 MODULE_AUTHOR(DRV_PROJECT);
 901 MODULE_VERSION(DRV_VERSION);
 902 MODULE_DESCRIPTION("rt2x00 usb library");
 903 MODULE_LICENSE("GPL");