drivers/net/wireless/rt2x00/rt2x00usb.c

   1 /*
   2         Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
   3         Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
   4         <http://rt2x00.serialmonkey.com>
   5
   6         This program is free software; you can redistribute it and/or modify
   7         it under the terms of the GNU General Public License as published by
   8         the Free Software Foundation; either version 2 of the License, or
   9         (at your option) any later version.
  10
  11         This program is distributed in the hope that it will be useful,
  12         but WITHOUT ANY WARRANTY; without even the implied warranty of
  13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14         GNU General Public License for more details.
  15
  16         You should have received a copy of the GNU General Public License
  17         along with this program; if not, write to the
  18         Free Software Foundation, Inc.,
  19         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 /*
  23         Module: rt2x00usb
  24         Abstract: rt2x00 generic usb device routines.
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30 #include <linux/usb.h>
  31 #include <linux/bug.h>
  32
  33 #include "rt2x00.h"
  34 #include "rt2x00usb.h"
  35
  36 /*
  37  * Interfacing with the HW.
  38  */
  39 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
  40                              const u8 request, const u8 requesttype,
  41                              const u16 offset, const u16 value,
  42                              void *buffer, const u16 buffer_length,
  43                              const int timeout)
  44 {
  45         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
  46         int status;
  47         unsigned int i;
  48         unsigned int pipe =
  49             (requesttype == USB_VENDOR_REQUEST_IN) ?
  50             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
  51
  52         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
  53                 return -ENODEV;
  54
  55         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
  56                 status = usb_control_msg(usb_dev, pipe, request, requesttype,
  57                                          value, offset, buffer, buffer_length,
  58                                          timeout);
  59                 if (status >= 0)
  60                         return 0;
  61
  62                 /*
  63                  * Check for errors
  64                  * -ENODEV: Device has disappeared, no point continuing.
  65                  * All other errors: Try again.
  66                  */
  67                 else if (status == -ENODEV) {
  68                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
  69                         break;
  70                 }
  71         }
  72
  73         ERROR(rt2x00dev,
  74               "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
  75               request, offset, status);
  76
  77         return status;
  78 }
  79 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
  80
  81 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
  82                                    const u8 request, const u8 requesttype,
  83                                    const u16 offset, void *buffer,
  84                                    const u16 buffer_length, const int timeout)
  85 {
  86         int status;
  87
  88         BUG_ON(!mutex_is_locked(&rt2x00dev->csr_mutex));
  89
  90         /*
  91          * Check for Cache availability.
  92          */
  93         if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
  94                 ERROR(rt2x00dev, "CSR cache not available.\n");
  95                 return -ENOMEM;
  96         }
  97
  98         if (requesttype == USB_VENDOR_REQUEST_OUT)
  99                 memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
 100
 101         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
 102                                           offset, 0, rt2x00dev->csr.cache,
 103                                           buffer_length, timeout);
 104
 105         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
 106                 memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
 107
 108         return status;
 109 }
 110 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
 111
 112 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 113                                   const u8 request, const u8 requesttype,
 114                                   const u16 offset, void *buffer,
 115                                   const u16 buffer_length, const int timeout)
 116 {
 117         int status = 0;
 118         unsigned char *tb;
 119         u16 off, len, bsize;
 120
 121         mutex_lock(&rt2x00dev->csr_mutex);
 122
 123         tb  = (char *)buffer;
 124         off = offset;
 125         len = buffer_length;
 126         while (len && !status) {
 127                 bsize = min_t(u16, CSR_CACHE_SIZE, len);
 128                 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
 129                                                         requesttype, off, tb,
 130                                                         bsize, timeout);
 131
 132                 tb  += bsize;
 133                 len -= bsize;
 134                 off += bsize;
 135         }
 136
 137         mutex_unlock(&rt2x00dev->csr_mutex);
 138
 139         return status;
 140 }
 141 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 142
 143 int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
 144                            const unsigned int offset,
 145                            const struct rt2x00_field32 field,
 146                            u32 *reg)
 147 {
 148         unsigned int i;
 149
 150         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 151                 return -ENODEV;
 152
 153         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
 154                 rt2x00usb_register_read_lock(rt2x00dev, offset, reg);
 155                 if (!rt2x00_get_field32(*reg, field))
 156                         return 1;
 157                 udelay(REGISTER_BUSY_DELAY);
 158         }
 159
 160         ERROR(rt2x00dev, "Indirect register access failed: "
 161               "offset=0x%.08x, value=0x%.08x\n", offset, *reg);
 162         *reg = ~0;
 163
 164         return 0;
 165 }
 166 EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read);
 167
 168 /*
 169  * TX data handlers.
 170  */
 171 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
 172 {
 173         /*
 174          * If the transfer to hardware succeeded, it does not mean the
 175          * frame was send out correctly. It only means the frame
 176          * was succesfully pushed to the hardware, we have no
 177          * way to determine the transmission status right now.
 178          * (Only indirectly by looking at the failed TX counters
 179          * in the register).
 180          */
 181         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 182                 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
 183         else
 184                 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
 185 }
 186
 187 static void rt2x00usb_work_txdone(struct work_struct *work)
 188 {
 189         struct rt2x00_dev *rt2x00dev =
 190             container_of(work, struct rt2x00_dev, txdone_work);
 191         struct data_queue *queue;
 192         struct queue_entry *entry;
 193
 194         tx_queue_for_each(rt2x00dev, queue) {
 195                 while (!rt2x00queue_empty(queue)) {
 196                         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 197
 198                         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 199                                 break;
 200
 201                         rt2x00usb_work_txdone_entry(entry);
 202                 }
 203         }
 204 }
 205
 206 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 207 {
 208         struct queue_entry *entry = (struct queue_entry *)urb->context;
 209         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 210
 211         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 212                 return;
 213
 214         /*
 215          * Report the frame as DMA done
 216          */
 217         rt2x00lib_dmadone(entry);
 218
 219         /*
 220          * Check if the frame was correctly uploaded
 221          */
 222         if (urb->status)
 223                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 224
 225         /*
 226          * Schedule the delayed work for reading the TX status
 227          * from the device.
 228          */
 229         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 230             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 231                 ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->txdone_work);
 232 }
 233
 234 static void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
 235 {
 236         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 237         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 238         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 239         u32 length;
 240
 241         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags))
 242                 return;
 243
 244         /*
 245          * USB devices cannot blindly pass the skb->len as the
 246          * length of the data to usb_fill_bulk_urb. Pass the skb
 247          * to the driver to determine what the length should be.
 248          */
 249         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 250
 251         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 252                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 253                           entry->skb->data, length,
 254                           rt2x00usb_interrupt_txdone, entry);
 255
 256         usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 257 }
 258
 259 void rt2x00usb_kick_tx_queue(struct data_queue *queue)
 260 {
 261         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 262                                    rt2x00usb_kick_tx_entry);
 263 }
 264 EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue);
 265
 266 static void rt2x00usb_kill_tx_entry(struct queue_entry *entry)
 267 {
 268         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 269         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 270         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
 271
 272         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 273                 return;
 274
 275         usb_kill_urb(entry_priv->urb);
 276
 277         /*
 278          * Kill guardian urb (if required by driver).
 279          */
 280         if ((entry->queue->qid == QID_BEACON) &&
 281             (test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags)))
 282                 usb_kill_urb(bcn_priv->guardian_urb);
 283
 284         /*
 285          * We need a short delay here to wait for
 286          * the URB to be canceled
 287          */
 288         do {
 289                 udelay(100);
 290         } while (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags));
 291 }
 292
 293 void rt2x00usb_kill_tx_queue(struct data_queue *queue)
 294 {
 295         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 296                                    rt2x00usb_kill_tx_entry);
 297 }
 298 EXPORT_SYMBOL_GPL(rt2x00usb_kill_tx_queue);
 299
 300 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
 301 {
 302         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 303         unsigned short threshold = queue->threshold;
 304
 305         WARNING(queue->rt2x00dev, "TX queue %d DMA timed out,"
 306                 " invoke forced forced reset", queue->qid);
 307
 308         /*
 309          * Temporarily disable the TX queue, this will force mac80211
 310          * to use the other queues until this queue has been restored.
 311          *
 312          * Set the queue threshold to the queue limit. This prevents the
 313          * queue from being enabled during the txdone handler.
 314          */
 315         queue->threshold = queue->limit;
 316         ieee80211_stop_queue(rt2x00dev->hw, queue->qid);
 317
 318         /*
 319          * Kill all entries in the queue, afterwards we need to
 320          * wait a bit for all URBs to be cancelled.
 321          */
 322         rt2x00usb_kill_tx_queue(queue);
 323
 324         /*
 325          * In case that a driver has overriden the txdone_work
 326          * function, we invoke the TX done through there.
 327          */
 328         rt2x00dev->txdone_work.func(&rt2x00dev->txdone_work);
 329
 330         /*
 331          * Security measure: if the driver did override the
 332          * txdone_work function, and the hardware did arrive
 333          * in a state which causes it to malfunction, it is
 334          * possible that the driver couldn't handle the txdone
 335          * event correctly. So after giving the driver the
 336          * chance to cleanup, we now force a cleanup of any
 337          * leftovers.
 338          */
 339         if (!rt2x00queue_empty(queue)) {
 340                 WARNING(queue->rt2x00dev, "TX queue %d DMA timed out,"
 341                         " status handling failed, invoke hard reset", queue->qid);
 342                 rt2x00usb_work_txdone(&rt2x00dev->txdone_work);
 343         }
 344
 345         /*
 346          * The queue has been reset, and mac80211 is allowed to use the
 347          * queue again.
 348          */
 349         queue->threshold = threshold;
 350         ieee80211_wake_queue(rt2x00dev->hw, queue->qid);
 351 }
 352
 353 static void rt2x00usb_watchdog_tx_status(struct data_queue *queue)
 354 {
 355         WARNING(queue->rt2x00dev, "TX queue %d status timed out,"
 356                 " invoke forced tx handler", queue->qid);
 357
 358         ieee80211_queue_work(queue->rt2x00dev->hw, &queue->rt2x00dev->txdone_work);
 359 }
 360
 361 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 362 {
 363         struct data_queue *queue;
 364
 365         tx_queue_for_each(rt2x00dev, queue) {
 366                 if (!rt2x00queue_empty(queue)) {
 367                         if (rt2x00queue_dma_timeout(queue))
 368                                 rt2x00usb_watchdog_tx_dma(queue);
 369                         if (rt2x00queue_timeout(queue))
 370                                 rt2x00usb_watchdog_tx_status(queue);
 371                 }
 372         }
 373 }
 374 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 375
 376 /*
 377  * RX data handlers.
 378  */
 379 static void rt2x00usb_work_rxdone(struct work_struct *work)
 380 {
 381         struct rt2x00_dev *rt2x00dev =
 382             container_of(work, struct rt2x00_dev, rxdone_work);
 383         struct queue_entry *entry;
 384         struct skb_frame_desc *skbdesc;
 385         u8 rxd[32];
 386
 387         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 388                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 389
 390                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 391                         break;
 392
 393                 /*
 394                  * Fill in desc fields of the skb descriptor
 395                  */
 396                 skbdesc = get_skb_frame_desc(entry->skb);
 397                 skbdesc->desc = rxd;
 398                 skbdesc->desc_len = entry->queue->desc_size;
 399
 400                 /*
 401                  * Send the frame to rt2x00lib for further processing.
 402                  */
 403                 rt2x00lib_rxdone(entry);
 404         }
 405 }
 406
 407 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 408 {
 409         struct queue_entry *entry = (struct queue_entry *)urb->context;
 410         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 411
 412         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 413                 return;
 414
 415         /*
 416          * Report the frame as DMA done
 417          */
 418         rt2x00lib_dmadone(entry);
 419
 420         /*
 421          * Check if the received data is simply too small
 422          * to be actually valid, or if the urb is signaling
 423          * a problem.
 424          */
 425         if (urb->actual_length < entry->queue->desc_size || urb->status)
 426                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 427
 428         /*
 429          * Schedule the delayed work for reading the RX status
 430          * from the device.
 431          */
 432         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 433             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 434                 ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->rxdone_work);
 435 }
 436
 437 /*
 438  * Radio handlers
 439  */
 440 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 441 {
 442         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 443                                     REGISTER_TIMEOUT);
 444
 445         /*
 446          * The USB version of kill_tx_queue also works
 447          * on the RX queue.
 448          */
 449         rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev->rx);
 450 }
 451 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 452
 453 /*
 454  * Device initialization handlers.
 455  */
 456 void rt2x00usb_clear_entry(struct queue_entry *entry)
 457 {
 458         struct usb_device *usb_dev =
 459             to_usb_device_intf(entry->queue->rt2x00dev->dev);
 460         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 461         int pipe;
 462
 463         entry->flags = 0;
 464
 465         if (entry->queue->qid == QID_RX) {
 466                 pipe = usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint);
 467                 usb_fill_bulk_urb(entry_priv->urb, usb_dev, pipe,
 468                                 entry->skb->data, entry->skb->len,
 469                                 rt2x00usb_interrupt_rxdone, entry);
 470
 471                 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 472                 usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 473         }
 474 }
 475 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 476
 477 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 478                                       struct usb_endpoint_descriptor *ep_desc)
 479 {
 480         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 481         int pipe;
 482
 483         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 484
 485         if (queue->qid == QID_RX) {
 486                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 487                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 488         } else {
 489                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 490                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 491         }
 492
 493         if (!queue->usb_maxpacket)
 494                 queue->usb_maxpacket = 1;
 495 }
 496
 497 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 498 {
 499         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 500         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 501         struct usb_endpoint_descriptor *ep_desc;
 502         struct data_queue *queue = rt2x00dev->tx;
 503         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 504         unsigned int i;
 505
 506         /*
 507          * Walk through all available endpoints to search for "bulk in"
 508          * and "bulk out" endpoints. When we find such endpoints collect
 509          * the information we need from the descriptor and assign it
 510          * to the queue.
 511          */
 512         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 513                 ep_desc = &intf_desc->endpoint[i].desc;
 514
 515                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 516                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 517                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 518                            (queue != queue_end(rt2x00dev))) {
 519                         rt2x00usb_assign_endpoint(queue, ep_desc);
 520                         queue = queue_next(queue);
 521
 522                         tx_ep_desc = ep_desc;
 523                 }
 524         }
 525
 526         /*
 527          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 528          */
 529         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 530                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 531                 return -EPIPE;
 532         }
 533
 534         /*
 535          * It might be possible not all queues have a dedicated endpoint.
 536          * Loop through all TX queues and copy the endpoint information
 537          * which we have gathered from already assigned endpoints.
 538          */
 539         txall_queue_for_each(rt2x00dev, queue) {
 540                 if (!queue->usb_endpoint)
 541                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 542         }
 543
 544         return 0;
 545 }
 546
 547 static int rt2x00usb_alloc_entries(struct data_queue *queue)
 548 {
 549         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 550         struct queue_entry_priv_usb *entry_priv;
 551         struct queue_entry_priv_usb_bcn *bcn_priv;
 552         unsigned int i;
 553
 554         for (i = 0; i < queue->limit; i++) {
 555                 entry_priv = queue->entries[i].priv_data;
 556                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 557                 if (!entry_priv->urb)
 558                         return -ENOMEM;
 559         }
 560
 561         /*
 562          * If this is not the beacon queue or
 563          * no guardian byte was required for the beacon,
 564          * then we are done.
 565          */
 566         if (queue->qid != QID_BEACON ||
 567             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 568                 return 0;
 569
 570         for (i = 0; i < queue->limit; i++) {
 571                 bcn_priv = queue->entries[i].priv_data;
 572                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 573                 if (!bcn_priv->guardian_urb)
 574                         return -ENOMEM;
 575         }
 576
 577         return 0;
 578 }
 579
 580 static void rt2x00usb_free_entries(struct data_queue *queue)
 581 {
 582         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 583         struct queue_entry_priv_usb *entry_priv;
 584         struct queue_entry_priv_usb_bcn *bcn_priv;
 585         unsigned int i;
 586
 587         if (!queue->entries)
 588                 return;
 589
 590         for (i = 0; i < queue->limit; i++) {
 591                 entry_priv = queue->entries[i].priv_data;
 592                 usb_kill_urb(entry_priv->urb);
 593                 usb_free_urb(entry_priv->urb);
 594         }
 595
 596         /*
 597          * If this is not the beacon queue or
 598          * no guardian byte was required for the beacon,
 599          * then we are done.
 600          */
 601         if (queue->qid != QID_BEACON ||
 602             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 603                 return;
 604
 605         for (i = 0; i < queue->limit; i++) {
 606                 bcn_priv = queue->entries[i].priv_data;
 607                 usb_kill_urb(bcn_priv->guardian_urb);
 608                 usb_free_urb(bcn_priv->guardian_urb);
 609         }
 610 }
 611
 612 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 613 {
 614         struct data_queue *queue;
 615         int status;
 616
 617         /*
 618          * Find endpoints for each queue
 619          */
 620         status = rt2x00usb_find_endpoints(rt2x00dev);
 621         if (status)
 622                 goto exit;
 623
 624         /*
 625          * Allocate DMA
 626          */
 627         queue_for_each(rt2x00dev, queue) {
 628                 status = rt2x00usb_alloc_entries(queue);
 629                 if (status)
 630                         goto exit;
 631         }
 632
 633         return 0;
 634
 635 exit:
 636         rt2x00usb_uninitialize(rt2x00dev);
 637
 638         return status;
 639 }
 640 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 641
 642 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 643 {
 644         struct data_queue *queue;
 645
 646         queue_for_each(rt2x00dev, queue)
 647                 rt2x00usb_free_entries(queue);
 648 }
 649 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 650
 651 /*
 652  * USB driver handlers.
 653  */
 654 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 655 {
 656         kfree(rt2x00dev->rf);
 657         rt2x00dev->rf = NULL;
 658
 659         kfree(rt2x00dev->eeprom);
 660         rt2x00dev->eeprom = NULL;
 661
 662         kfree(rt2x00dev->csr.cache);
 663         rt2x00dev->csr.cache = NULL;
 664 }
 665
 666 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 667 {
 668         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 669         if (!rt2x00dev->csr.cache)
 670                 goto exit;
 671
 672         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 673         if (!rt2x00dev->eeprom)
 674                 goto exit;
 675
 676         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 677         if (!rt2x00dev->rf)
 678                 goto exit;
 679
 680         return 0;
 681
 682 exit:
 683         ERROR_PROBE("Failed to allocate registers.\n");
 684
 685         rt2x00usb_free_reg(rt2x00dev);
 686
 687         return -ENOMEM;
 688 }
 689
 690 int rt2x00usb_probe(struct usb_interface *usb_intf,
 691                     const struct usb_device_id *id)
 692 {
 693         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 694         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 695         struct ieee80211_hw *hw;
 696         struct rt2x00_dev *rt2x00dev;
 697         int retval;
 698
 699         usb_dev = usb_get_dev(usb_dev);
 700
 701         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 702         if (!hw) {
 703                 ERROR_PROBE("Failed to allocate hardware.\n");
 704                 retval = -ENOMEM;
 705                 goto exit_put_device;
 706         }
 707
 708         usb_set_intfdata(usb_intf, hw);
 709
 710         rt2x00dev = hw->priv;
 711         rt2x00dev->dev = &usb_intf->dev;
 712         rt2x00dev->ops = ops;
 713         rt2x00dev->hw = hw;
 714
 715         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 716
 717         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 718         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 719
 720         retval = rt2x00usb_alloc_reg(rt2x00dev);
 721         if (retval)
 722                 goto exit_free_device;
 723
 724         retval = rt2x00lib_probe_dev(rt2x00dev);
 725         if (retval)
 726                 goto exit_free_reg;
 727
 728         return 0;
 729
 730 exit_free_reg:
 731         rt2x00usb_free_reg(rt2x00dev);
 732
 733 exit_free_device:
 734         ieee80211_free_hw(hw);
 735
 736 exit_put_device:
 737         usb_put_dev(usb_dev);
 738
 739         usb_set_intfdata(usb_intf, NULL);
 740
 741         return retval;
 742 }
 743 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 744
 745 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 746 {
 747         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 748         struct rt2x00_dev *rt2x00dev = hw->priv;
 749
 750         /*
 751          * Free all allocated data.
 752          */
 753         rt2x00lib_remove_dev(rt2x00dev);
 754         rt2x00usb_free_reg(rt2x00dev);
 755         ieee80211_free_hw(hw);
 756
 757         /*
 758          * Free the USB device data.
 759          */
 760         usb_set_intfdata(usb_intf, NULL);
 761         usb_put_dev(interface_to_usbdev(usb_intf));
 762 }
 763 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 764
 765 #ifdef CONFIG_PM
 766 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 767 {
 768         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 769         struct rt2x00_dev *rt2x00dev = hw->priv;
 770         int retval;
 771
 772         retval = rt2x00lib_suspend(rt2x00dev, state);
 773         if (retval)
 774                 return retval;
 775
 776         /*
 777          * Decrease usbdev refcount.
 778          */
 779         usb_put_dev(interface_to_usbdev(usb_intf));
 780
 781         return 0;
 782 }
 783 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 784
 785 int rt2x00usb_resume(struct usb_interface *usb_intf)
 786 {
 787         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 788         struct rt2x00_dev *rt2x00dev = hw->priv;
 789
 790         usb_get_dev(interface_to_usbdev(usb_intf));
 791
 792         return rt2x00lib_resume(rt2x00dev);
 793 }
 794 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 795 #endif /* CONFIG_PM */
 796
 797 /*
 798  * rt2x00usb module information.
 799  */
 800 MODULE_AUTHOR(DRV_PROJECT);
 801 MODULE_VERSION(DRV_VERSION);
 802 MODULE_DESCRIPTION("rt2x00 usb library");
 803 MODULE_LICENSE("GPL");