drivers/net/wireless/ralink/rt2x00/rt2x00usb.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3         Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
   4         Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
   5         <http://rt2x00.serialmonkey.com>
   6
   7  */
   8
   9 /*
  10         Module: rt2x00usb
  11         Abstract: rt2x00 generic usb device routines.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/usb.h>
  18 #include <linux/bug.h>
  19
  20 #include "rt2x00.h"
  21 #include "rt2x00usb.h"
  22
  23 static bool rt2x00usb_check_usb_error(struct rt2x00_dev *rt2x00dev, int status)
  24 {
  25         if (status == -ENODEV || status == -ENOENT)
  26                 return true;
  27
  28         if (!test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
  29                 return false;
  30
  31         if (status == -EPROTO || status == -ETIMEDOUT)
  32                 rt2x00dev->num_proto_errs++;
  33         else
  34                 rt2x00dev->num_proto_errs = 0;
  35
  36         if (rt2x00dev->num_proto_errs > 3)
  37                 return true;
  38
  39         return false;
  40 }
  41
  42 /*
  43  * Interfacing with the HW.
  44  */
  45 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
  46                              const u8 request, const u8 requesttype,
  47                              const u16 offset, const u16 value,
  48                              void *buffer, const u16 buffer_length,
  49                              const int timeout)
  50 {
  51         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
  52         int status;
  53         unsigned int pipe =
  54             (requesttype == USB_VENDOR_REQUEST_IN) ?
  55             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
  56         unsigned long expire = jiffies + msecs_to_jiffies(timeout);
  57
  58         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
  59                 return -ENODEV;
  60
  61         do {
  62                 status = usb_control_msg(usb_dev, pipe, request, requesttype,
  63                                          value, offset, buffer, buffer_length,
  64                                          timeout / 2);
  65                 if (status >= 0)
  66                         return 0;
  67
  68                 if (rt2x00usb_check_usb_error(rt2x00dev, status)) {
  69                         /* Device has disappeared. */
  70                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
  71                         break;
  72                 }
  73         } while (time_before(jiffies, expire));
  74
  75         rt2x00_err(rt2x00dev,
  76                    "Vendor Request 0x%02x failed for offset 0x%04x with error %d\n",
  77                    request, offset, status);
  78
  79         return status;
  80 }
  81 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
  82
  83 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
  84                                    const u8 request, const u8 requesttype,
  85                                    const u16 offset, void *buffer,
  86                                    const u16 buffer_length, const int timeout)
  87 {
  88         int status;
  89
  90         BUG_ON(!mutex_is_locked(&rt2x00dev->csr_mutex));
  91
  92         /*
  93          * Check for Cache availability.
  94          */
  95         if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
  96                 rt2x00_err(rt2x00dev, "CSR cache not available\n");
  97                 return -ENOMEM;
  98         }
  99
 100         if (requesttype == USB_VENDOR_REQUEST_OUT)
 101                 memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
 102
 103         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
 104                                           offset, 0, rt2x00dev->csr.cache,
 105                                           buffer_length, timeout);
 106
 107         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
 108                 memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
 109
 110         return status;
 111 }
 112 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
 113
 114 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 115                                   const u8 request, const u8 requesttype,
 116                                   const u16 offset, void *buffer,
 117                                   const u16 buffer_length)
 118 {
 119         int status = 0;
 120         u8 *tb;
 121         u16 off, len, bsize;
 122
 123         mutex_lock(&rt2x00dev->csr_mutex);
 124
 125         tb  = (u8 *)buffer;
 126         off = offset;
 127         len = buffer_length;
 128         while (len && !status) {
 129                 bsize = min_t(u16, CSR_CACHE_SIZE, len);
 130                 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
 131                                                         requesttype, off, tb,
 132                                                         bsize, REGISTER_TIMEOUT);
 133
 134                 tb  += bsize;
 135                 len -= bsize;
 136                 off += bsize;
 137         }
 138
 139         mutex_unlock(&rt2x00dev->csr_mutex);
 140
 141         return status;
 142 }
 143 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 144
 145 int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
 146                            const unsigned int offset,
 147                            const struct rt2x00_field32 field,
 148                            u32 *reg)
 149 {
 150         unsigned int i;
 151
 152         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 153                 return -ENODEV;
 154
 155         for (i = 0; i < REGISTER_USB_BUSY_COUNT; i++) {
 156                 *reg = rt2x00usb_register_read_lock(rt2x00dev, offset);
 157                 if (!rt2x00_get_field32(*reg, field))
 158                         return 1;
 159                 udelay(REGISTER_BUSY_DELAY);
 160         }
 161
 162         rt2x00_err(rt2x00dev, "Indirect register access failed: offset=0x%.08x, value=0x%.08x\n",
 163                    offset, *reg);
 164         *reg = ~0;
 165
 166         return 0;
 167 }
 168 EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read);
 169
 170
 171 struct rt2x00_async_read_data {
 172         __le32 reg;
 173         struct usb_ctrlrequest cr;
 174         struct rt2x00_dev *rt2x00dev;
 175         bool (*callback)(struct rt2x00_dev *, int, u32);
 176 };
 177
 178 static void rt2x00usb_register_read_async_cb(struct urb *urb)
 179 {
 180         struct rt2x00_async_read_data *rd = urb->context;
 181         if (rd->callback(rd->rt2x00dev, urb->status, le32_to_cpu(rd->reg))) {
 182                 usb_anchor_urb(urb, rd->rt2x00dev->anchor);
 183                 if (usb_submit_urb(urb, GFP_ATOMIC) < 0) {
 184                         usb_unanchor_urb(urb);
 185                         kfree(rd);
 186                 }
 187         } else
 188                 kfree(rd);
 189 }
 190
 191 void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev,
 192                                    const unsigned int offset,
 193                                    bool (*callback)(struct rt2x00_dev*, int, u32))
 194 {
 195         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 196         struct urb *urb;
 197         struct rt2x00_async_read_data *rd;
 198
 199         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 200         if (!rd)
 201                 return;
 202
 203         urb = usb_alloc_urb(0, GFP_ATOMIC);
 204         if (!urb) {
 205                 kfree(rd);
 206                 return;
 207         }
 208
 209         rd->rt2x00dev = rt2x00dev;
 210         rd->callback = callback;
 211         rd->cr.bRequestType = USB_VENDOR_REQUEST_IN;
 212         rd->cr.bRequest = USB_MULTI_READ;
 213         rd->cr.wValue = 0;
 214         rd->cr.wIndex = cpu_to_le16(offset);
 215         rd->cr.wLength = cpu_to_le16(sizeof(u32));
 216
 217         usb_fill_control_urb(urb, usb_dev, usb_rcvctrlpipe(usb_dev, 0),
 218                              (u8 *)(&rd->cr), &rd->reg, sizeof(rd->reg),
 219                              rt2x00usb_register_read_async_cb, rd);
 220         usb_anchor_urb(urb, rt2x00dev->anchor);
 221         if (usb_submit_urb(urb, GFP_ATOMIC) < 0) {
 222                 usb_unanchor_urb(urb);
 223                 kfree(rd);
 224         }
 225         usb_free_urb(urb);
 226 }
 227 EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async);
 228
 229 /*
 230  * TX data handlers.
 231  */
 232 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
 233 {
 234         /*
 235          * If the transfer to hardware succeeded, it does not mean the
 236          * frame was send out correctly. It only means the frame
 237          * was successfully pushed to the hardware, we have no
 238          * way to determine the transmission status right now.
 239          * (Only indirectly by looking at the failed TX counters
 240          * in the register).
 241          */
 242         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 243                 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
 244         else
 245                 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
 246 }
 247
 248 static void rt2x00usb_work_txdone(struct work_struct *work)
 249 {
 250         struct rt2x00_dev *rt2x00dev =
 251             container_of(work, struct rt2x00_dev, txdone_work);
 252         struct data_queue *queue;
 253         struct queue_entry *entry;
 254
 255         tx_queue_for_each(rt2x00dev, queue) {
 256                 while (!rt2x00queue_empty(queue)) {
 257                         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 258
 259                         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
 260                             !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 261                                 break;
 262
 263                         rt2x00usb_work_txdone_entry(entry);
 264                 }
 265         }
 266 }
 267
 268 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 269 {
 270         struct queue_entry *entry = (struct queue_entry *)urb->context;
 271         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 272
 273         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 274                 return;
 275         /*
 276          * Check if the frame was correctly uploaded
 277          */
 278         if (urb->status)
 279                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 280         /*
 281          * Report the frame as DMA done
 282          */
 283         rt2x00lib_dmadone(entry);
 284
 285         if (rt2x00dev->ops->lib->tx_dma_done)
 286                 rt2x00dev->ops->lib->tx_dma_done(entry);
 287         /*
 288          * Schedule the delayed work for reading the TX status
 289          * from the device.
 290          */
 291         if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TXSTATUS_FIFO) ||
 292             !kfifo_is_empty(&rt2x00dev->txstatus_fifo))
 293                 queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
 294 }
 295
 296 static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void *data)
 297 {
 298         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 299         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 300         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 301         u32 length;
 302         int status;
 303
 304         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
 305             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 306                 return false;
 307
 308         /*
 309          * USB devices require certain padding at the end of each frame
 310          * and urb. Those paddings are not included in skbs. Pass entry
 311          * to the driver to determine what the overall length should be.
 312          */
 313         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 314
 315         status = skb_padto(entry->skb, length);
 316         if (unlikely(status)) {
 317                 /* TODO: report something more appropriate than IO_FAILED. */
 318                 rt2x00_warn(rt2x00dev, "TX SKB padding error, out of memory\n");
 319                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 320                 rt2x00lib_dmadone(entry);
 321
 322                 return false;
 323         }
 324
 325         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 326                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 327                           entry->skb->data, length,
 328                           rt2x00usb_interrupt_txdone, entry);
 329
 330         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 331         if (status) {
 332                 if (rt2x00usb_check_usb_error(rt2x00dev, status))
 333                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 334                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 335                 rt2x00lib_dmadone(entry);
 336         }
 337
 338         return false;
 339 }
 340
 341 /*
 342  * RX data handlers.
 343  */
 344 static void rt2x00usb_work_rxdone(struct work_struct *work)
 345 {
 346         struct rt2x00_dev *rt2x00dev =
 347             container_of(work, struct rt2x00_dev, rxdone_work);
 348         struct queue_entry *entry;
 349         struct skb_frame_desc *skbdesc;
 350         u8 rxd[32];
 351
 352         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 353                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 354
 355                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 356                         break;
 357
 358                 /*
 359                  * Fill in desc fields of the skb descriptor
 360                  */
 361                 skbdesc = get_skb_frame_desc(entry->skb);
 362                 skbdesc->desc = rxd;
 363                 skbdesc->desc_len = entry->queue->desc_size;
 364
 365                 /*
 366                  * Send the frame to rt2x00lib for further processing.
 367                  */
 368                 rt2x00lib_rxdone(entry, GFP_KERNEL);
 369         }
 370 }
 371
 372 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 373 {
 374         struct queue_entry *entry = (struct queue_entry *)urb->context;
 375         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 376
 377         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 378                 return;
 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          * Report the frame as DMA done
 390          */
 391         rt2x00lib_dmadone(entry);
 392
 393         /*
 394          * Schedule the delayed work for processing RX data
 395          */
 396         queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
 397 }
 398
 399 static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data)
 400 {
 401         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 402         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 403         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 404         int status;
 405
 406         if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 407                 return false;
 408
 409         rt2x00lib_dmastart(entry);
 410
 411         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 412                           usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
 413                           entry->skb->data, entry->skb->len,
 414                           rt2x00usb_interrupt_rxdone, entry);
 415
 416         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 417         if (status) {
 418                 if (rt2x00usb_check_usb_error(rt2x00dev, status))
 419                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 420                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 421                 rt2x00lib_dmadone(entry);
 422         }
 423
 424         return false;
 425 }
 426
 427 void rt2x00usb_kick_queue(struct data_queue *queue)
 428 {
 429         switch (queue->qid) {
 430         case QID_AC_VO:
 431         case QID_AC_VI:
 432         case QID_AC_BE:
 433         case QID_AC_BK:
 434                 if (!rt2x00queue_empty(queue))
 435                         rt2x00queue_for_each_entry(queue,
 436                                                    Q_INDEX_DONE,
 437                                                    Q_INDEX,
 438                                                    NULL,
 439                                                    rt2x00usb_kick_tx_entry);
 440                 break;
 441         case QID_RX:
 442                 if (!rt2x00queue_full(queue))
 443                         rt2x00queue_for_each_entry(queue,
 444                                                    Q_INDEX,
 445                                                    Q_INDEX_DONE,
 446                                                    NULL,
 447                                                    rt2x00usb_kick_rx_entry);
 448                 break;
 449         default:
 450                 break;
 451         }
 452 }
 453 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
 454
 455 static bool rt2x00usb_flush_entry(struct queue_entry *entry, void *data)
 456 {
 457         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 458         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 459         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
 460
 461         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 462                 return false;
 463
 464         usb_kill_urb(entry_priv->urb);
 465
 466         /*
 467          * Kill guardian urb (if required by driver).
 468          */
 469         if ((entry->queue->qid == QID_BEACON) &&
 470             (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD)))
 471                 usb_kill_urb(bcn_priv->guardian_urb);
 472
 473         return false;
 474 }
 475
 476 void rt2x00usb_flush_queue(struct data_queue *queue, bool drop)
 477 {
 478         struct work_struct *completion;
 479         unsigned int i;
 480
 481         if (drop)
 482                 rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL,
 483                                            rt2x00usb_flush_entry);
 484
 485         /*
 486          * Obtain the queue completion handler
 487          */
 488         switch (queue->qid) {
 489         case QID_AC_VO:
 490         case QID_AC_VI:
 491         case QID_AC_BE:
 492         case QID_AC_BK:
 493                 completion = &queue->rt2x00dev->txdone_work;
 494                 break;
 495         case QID_RX:
 496                 completion = &queue->rt2x00dev->rxdone_work;
 497                 break;
 498         default:
 499                 return;
 500         }
 501
 502         for (i = 0; i < 10; i++) {
 503                 /*
 504                  * Check if the driver is already done, otherwise we
 505                  * have to sleep a little while to give the driver/hw
 506                  * the oppurtunity to complete interrupt process itself.
 507                  */
 508                 if (rt2x00queue_empty(queue))
 509                         break;
 510
 511                 /*
 512                  * Schedule the completion handler manually, when this
 513                  * worker function runs, it should cleanup the queue.
 514                  */
 515                 queue_work(queue->rt2x00dev->workqueue, completion);
 516
 517                 /*
 518                  * Wait for a little while to give the driver
 519                  * the oppurtunity to recover itself.
 520                  */
 521                 msleep(50);
 522         }
 523 }
 524 EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue);
 525
 526 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
 527 {
 528         rt2x00_warn(queue->rt2x00dev, "TX queue %d DMA timed out, invoke forced reset\n",
 529                     queue->qid);
 530
 531         rt2x00queue_stop_queue(queue);
 532         rt2x00queue_flush_queue(queue, true);
 533         rt2x00queue_start_queue(queue);
 534 }
 535
 536 static int rt2x00usb_dma_timeout(struct data_queue *queue)
 537 {
 538         struct queue_entry *entry;
 539
 540         entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE);
 541         return rt2x00queue_dma_timeout(entry);
 542 }
 543
 544 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 545 {
 546         struct data_queue *queue;
 547
 548         tx_queue_for_each(rt2x00dev, queue) {
 549                 if (!rt2x00queue_empty(queue)) {
 550                         if (rt2x00usb_dma_timeout(queue))
 551                                 rt2x00usb_watchdog_tx_dma(queue);
 552                 }
 553         }
 554 }
 555 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 556
 557 /*
 558  * Radio handlers
 559  */
 560 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 561 {
 562         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 563                                     REGISTER_TIMEOUT);
 564 }
 565 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 566
 567 /*
 568  * Device initialization handlers.
 569  */
 570 void rt2x00usb_clear_entry(struct queue_entry *entry)
 571 {
 572         entry->flags = 0;
 573
 574         if (entry->queue->qid == QID_RX)
 575                 rt2x00usb_kick_rx_entry(entry, NULL);
 576 }
 577 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 578
 579 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 580                                       struct usb_endpoint_descriptor *ep_desc)
 581 {
 582         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 583         int pipe;
 584
 585         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 586
 587         if (queue->qid == QID_RX) {
 588                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 589                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe);
 590         } else {
 591                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 592                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe);
 593         }
 594
 595         if (!queue->usb_maxpacket)
 596                 queue->usb_maxpacket = 1;
 597 }
 598
 599 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 600 {
 601         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 602         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 603         struct usb_endpoint_descriptor *ep_desc;
 604         struct data_queue *queue = rt2x00dev->tx;
 605         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 606         unsigned int i;
 607
 608         /*
 609          * Walk through all available endpoints to search for "bulk in"
 610          * and "bulk out" endpoints. When we find such endpoints collect
 611          * the information we need from the descriptor and assign it
 612          * to the queue.
 613          */
 614         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 615                 ep_desc = &intf_desc->endpoint[i].desc;
 616
 617                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 618                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 619                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 620                            (queue != queue_end(rt2x00dev))) {
 621                         rt2x00usb_assign_endpoint(queue, ep_desc);
 622                         queue = queue_next(queue);
 623
 624                         tx_ep_desc = ep_desc;
 625                 }
 626         }
 627
 628         /*
 629          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 630          */
 631         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 632                 rt2x00_err(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 633                 return -EPIPE;
 634         }
 635
 636         /*
 637          * It might be possible not all queues have a dedicated endpoint.
 638          * Loop through all TX queues and copy the endpoint information
 639          * which we have gathered from already assigned endpoints.
 640          */
 641         txall_queue_for_each(rt2x00dev, queue) {
 642                 if (!queue->usb_endpoint)
 643                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 644         }
 645
 646         return 0;
 647 }
 648
 649 static int rt2x00usb_alloc_entries(struct data_queue *queue)
 650 {
 651         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 652         struct queue_entry_priv_usb *entry_priv;
 653         struct queue_entry_priv_usb_bcn *bcn_priv;
 654         unsigned int i;
 655
 656         for (i = 0; i < queue->limit; i++) {
 657                 entry_priv = queue->entries[i].priv_data;
 658                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 659                 if (!entry_priv->urb)
 660                         return -ENOMEM;
 661         }
 662
 663         /*
 664          * If this is not the beacon queue or
 665          * no guardian byte was required for the beacon,
 666          * then we are done.
 667          */
 668         if (queue->qid != QID_BEACON ||
 669             !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))
 670                 return 0;
 671
 672         for (i = 0; i < queue->limit; i++) {
 673                 bcn_priv = queue->entries[i].priv_data;
 674                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 675                 if (!bcn_priv->guardian_urb)
 676                         return -ENOMEM;
 677         }
 678
 679         return 0;
 680 }
 681
 682 static void rt2x00usb_free_entries(struct data_queue *queue)
 683 {
 684         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 685         struct queue_entry_priv_usb *entry_priv;
 686         struct queue_entry_priv_usb_bcn *bcn_priv;
 687         unsigned int i;
 688
 689         if (!queue->entries)
 690                 return;
 691
 692         for (i = 0; i < queue->limit; i++) {
 693                 entry_priv = queue->entries[i].priv_data;
 694                 usb_kill_urb(entry_priv->urb);
 695                 usb_free_urb(entry_priv->urb);
 696         }
 697
 698         /*
 699          * If this is not the beacon queue or
 700          * no guardian byte was required for the beacon,
 701          * then we are done.
 702          */
 703         if (queue->qid != QID_BEACON ||
 704             !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))
 705                 return;
 706
 707         for (i = 0; i < queue->limit; i++) {
 708                 bcn_priv = queue->entries[i].priv_data;
 709                 usb_kill_urb(bcn_priv->guardian_urb);
 710                 usb_free_urb(bcn_priv->guardian_urb);
 711         }
 712 }
 713
 714 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 715 {
 716         struct data_queue *queue;
 717         int status;
 718
 719         /*
 720          * Find endpoints for each queue
 721          */
 722         status = rt2x00usb_find_endpoints(rt2x00dev);
 723         if (status)
 724                 goto exit;
 725
 726         /*
 727          * Allocate DMA
 728          */
 729         queue_for_each(rt2x00dev, queue) {
 730                 status = rt2x00usb_alloc_entries(queue);
 731                 if (status)
 732                         goto exit;
 733         }
 734
 735         return 0;
 736
 737 exit:
 738         rt2x00usb_uninitialize(rt2x00dev);
 739
 740         return status;
 741 }
 742 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 743
 744 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 745 {
 746         struct data_queue *queue;
 747
 748         usb_kill_anchored_urbs(rt2x00dev->anchor);
 749         hrtimer_cancel(&rt2x00dev->txstatus_timer);
 750         cancel_work_sync(&rt2x00dev->rxdone_work);
 751         cancel_work_sync(&rt2x00dev->txdone_work);
 752
 753         queue_for_each(rt2x00dev, queue)
 754                 rt2x00usb_free_entries(queue);
 755 }
 756 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 757
 758 /*
 759  * USB driver handlers.
 760  */
 761 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 762 {
 763         kfree(rt2x00dev->rf);
 764         rt2x00dev->rf = NULL;
 765
 766         kfree(rt2x00dev->eeprom);
 767         rt2x00dev->eeprom = NULL;
 768
 769         kfree(rt2x00dev->csr.cache);
 770         rt2x00dev->csr.cache = NULL;
 771 }
 772
 773 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 774 {
 775         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 776         if (!rt2x00dev->csr.cache)
 777                 goto exit;
 778
 779         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 780         if (!rt2x00dev->eeprom)
 781                 goto exit;
 782
 783         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 784         if (!rt2x00dev->rf)
 785                 goto exit;
 786
 787         return 0;
 788
 789 exit:
 790         rt2x00_probe_err("Failed to allocate registers\n");
 791
 792         rt2x00usb_free_reg(rt2x00dev);
 793
 794         return -ENOMEM;
 795 }
 796
 797 int rt2x00usb_probe(struct usb_interface *usb_intf,
 798                     const struct rt2x00_ops *ops)
 799 {
 800         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 801         struct ieee80211_hw *hw;
 802         struct rt2x00_dev *rt2x00dev;
 803         int retval;
 804
 805         usb_dev = usb_get_dev(usb_dev);
 806         usb_reset_device(usb_dev);
 807
 808         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 809         if (!hw) {
 810                 rt2x00_probe_err("Failed to allocate hardware\n");
 811                 retval = -ENOMEM;
 812                 goto exit_put_device;
 813         }
 814
 815         usb_set_intfdata(usb_intf, hw);
 816
 817         rt2x00dev = hw->priv;
 818         rt2x00dev->dev = &usb_intf->dev;
 819         rt2x00dev->ops = ops;
 820         rt2x00dev->hw = hw;
 821
 822         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 823
 824         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 825         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 826         hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC,
 827                      HRTIMER_MODE_REL);
 828
 829         retval = rt2x00usb_alloc_reg(rt2x00dev);
 830         if (retval)
 831                 goto exit_free_device;
 832
 833         rt2x00dev->anchor = devm_kmalloc(&usb_dev->dev,
 834                                         sizeof(struct usb_anchor),
 835                                         GFP_KERNEL);
 836         if (!rt2x00dev->anchor) {
 837                 retval = -ENOMEM;
 838                 goto exit_free_reg;
 839         }
 840         init_usb_anchor(rt2x00dev->anchor);
 841
 842         retval = rt2x00lib_probe_dev(rt2x00dev);
 843         if (retval)
 844                 goto exit_free_anchor;
 845
 846         return 0;
 847
 848 exit_free_anchor:
 849         usb_kill_anchored_urbs(rt2x00dev->anchor);
 850
 851 exit_free_reg:
 852         rt2x00usb_free_reg(rt2x00dev);
 853
 854 exit_free_device:
 855         ieee80211_free_hw(hw);
 856
 857 exit_put_device:
 858         usb_put_dev(usb_dev);
 859
 860         usb_set_intfdata(usb_intf, NULL);
 861
 862         return retval;
 863 }
 864 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 865
 866 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 867 {
 868         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 869         struct rt2x00_dev *rt2x00dev = hw->priv;
 870
 871         /*
 872          * Free all allocated data.
 873          */
 874         rt2x00lib_remove_dev(rt2x00dev);
 875         rt2x00usb_free_reg(rt2x00dev);
 876         ieee80211_free_hw(hw);
 877
 878         /*
 879          * Free the USB device data.
 880          */
 881         usb_set_intfdata(usb_intf, NULL);
 882         usb_put_dev(interface_to_usbdev(usb_intf));
 883 }
 884 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 885
 886 #ifdef CONFIG_PM
 887 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 888 {
 889         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 890         struct rt2x00_dev *rt2x00dev = hw->priv;
 891
 892         return rt2x00lib_suspend(rt2x00dev);
 893 }
 894 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 895
 896 int rt2x00usb_resume(struct usb_interface *usb_intf)
 897 {
 898         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 899         struct rt2x00_dev *rt2x00dev = hw->priv;
 900
 901         return rt2x00lib_resume(rt2x00dev);
 902 }
 903 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 904 #endif /* CONFIG_PM */
 905
 906 /*
 907  * rt2x00usb module information.
 908  */
 909 MODULE_AUTHOR(DRV_PROJECT);
 910 MODULE_VERSION(DRV_VERSION);
 911 MODULE_DESCRIPTION("rt2x00 usb library");
 912 MODULE_LICENSE("GPL");