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