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         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->txdone_work);
 230 }
 231
 232 static void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
 233 {
 234         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 235         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 236         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 237         u32 length;
 238         int status;
 239
 240         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags))
 241                 return;
 242
 243         /*
 244          * USB devices cannot blindly pass the skb->len as the
 245          * length of the data to usb_fill_bulk_urb. Pass the skb
 246          * to the driver to determine what the length should be.
 247          */
 248         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 249
 250         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 251                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 252                           entry->skb->data, length,
 253                           rt2x00usb_interrupt_txdone, entry);
 254
 255         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 256         if (status) {
 257                 if (status == -ENODEV)
 258                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 259                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 260                 rt2x00lib_dmadone(entry);
 261         }
 262 }
 263
 264 void rt2x00usb_kick_queue(struct data_queue *queue)
 265 {
 266         switch (queue->qid) {
 267         case QID_AC_BE:
 268         case QID_AC_BK:
 269         case QID_AC_VI:
 270         case QID_AC_VO:
 271                 if (!rt2x00queue_empty(queue))
 272                         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 273                                                    rt2x00usb_kick_tx_entry);
 274                 break;
 275         default:
 276                 break;
 277         }
 278 }
 279 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
 280
 281 static void rt2x00usb_kill_entry(struct queue_entry *entry)
 282 {
 283         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 284         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 285         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
 286
 287         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 288                 return;
 289
 290         usb_kill_urb(entry_priv->urb);
 291
 292         /*
 293          * Kill guardian urb (if required by driver).
 294          */
 295         if ((entry->queue->qid == QID_BEACON) &&
 296             (test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags)))
 297                 usb_kill_urb(bcn_priv->guardian_urb);
 298 }
 299
 300 void rt2x00usb_stop_queue(struct data_queue *queue)
 301 {
 302         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
 303                                    rt2x00usb_kill_entry);
 304 }
 305 EXPORT_SYMBOL_GPL(rt2x00usb_stop_queue);
 306
 307 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
 308 {
 309         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 310         unsigned short threshold = queue->threshold;
 311
 312         WARNING(queue->rt2x00dev, "TX queue %d DMA timed out,"
 313                 " invoke forced forced reset\n", queue->qid);
 314
 315         /*
 316          * Temporarily disable the TX queue, this will force mac80211
 317          * to use the other queues until this queue has been restored.
 318          *
 319          * Set the queue threshold to the queue limit. This prevents the
 320          * queue from being enabled during the txdone handler.
 321          */
 322         queue->threshold = queue->limit;
 323         ieee80211_stop_queue(rt2x00dev->hw, queue->qid);
 324
 325         /*
 326          * Kill all entries in the queue, afterwards we need to
 327          * wait a bit for all URBs to be cancelled.
 328          */
 329         rt2x00usb_stop_queue(queue);
 330
 331         /*
 332          * In case that a driver has overriden the txdone_work
 333          * function, we invoke the TX done through there.
 334          */
 335         rt2x00dev->txdone_work.func(&rt2x00dev->txdone_work);
 336
 337         /*
 338          * The queue has been reset, and mac80211 is allowed to use the
 339          * queue again.
 340          */
 341         queue->threshold = threshold;
 342         ieee80211_wake_queue(rt2x00dev->hw, queue->qid);
 343 }
 344
 345 static void rt2x00usb_watchdog_tx_status(struct data_queue *queue)
 346 {
 347         WARNING(queue->rt2x00dev, "TX queue %d status timed out,"
 348                 " invoke forced tx handler\n", queue->qid);
 349
 350         ieee80211_queue_work(queue->rt2x00dev->hw, &queue->rt2x00dev->txdone_work);
 351 }
 352
 353 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 354 {
 355         struct data_queue *queue;
 356
 357         tx_queue_for_each(rt2x00dev, queue) {
 358                 if (!rt2x00queue_empty(queue)) {
 359                         if (rt2x00queue_dma_timeout(queue))
 360                                 rt2x00usb_watchdog_tx_dma(queue);
 361                         if (rt2x00queue_status_timeout(queue))
 362                                 rt2x00usb_watchdog_tx_status(queue);
 363                 }
 364         }
 365 }
 366 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 367
 368 /*
 369  * RX data handlers.
 370  */
 371 static void rt2x00usb_work_rxdone(struct work_struct *work)
 372 {
 373         struct rt2x00_dev *rt2x00dev =
 374             container_of(work, struct rt2x00_dev, rxdone_work);
 375         struct queue_entry *entry;
 376         struct skb_frame_desc *skbdesc;
 377         u8 rxd[32];
 378
 379         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 380                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 381
 382                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 383                         break;
 384
 385                 /*
 386                  * Fill in desc fields of the skb descriptor
 387                  */
 388                 skbdesc = get_skb_frame_desc(entry->skb);
 389                 skbdesc->desc = rxd;
 390                 skbdesc->desc_len = entry->queue->desc_size;
 391
 392                 /*
 393                  * Send the frame to rt2x00lib for further processing.
 394                  */
 395                 rt2x00lib_rxdone(entry);
 396         }
 397 }
 398
 399 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 400 {
 401         struct queue_entry *entry = (struct queue_entry *)urb->context;
 402         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 403
 404         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 405                 return;
 406
 407         /*
 408          * Report the frame as DMA done
 409          */
 410         rt2x00lib_dmadone(entry);
 411
 412         /*
 413          * Check if the received data is simply too small
 414          * to be actually valid, or if the urb is signaling
 415          * a problem.
 416          */
 417         if (urb->actual_length < entry->queue->desc_size || urb->status)
 418                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 419
 420         /*
 421          * Schedule the delayed work for reading the RX status
 422          * from the device.
 423          */
 424         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->rxdone_work);
 425 }
 426
 427 /*
 428  * Radio handlers
 429  */
 430 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 431 {
 432         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 433                                     REGISTER_TIMEOUT);
 434
 435         rt2x00dev->ops->lib->stop_queue(rt2x00dev->rx);
 436 }
 437 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 438
 439 /*
 440  * Device initialization handlers.
 441  */
 442 void rt2x00usb_clear_entry(struct queue_entry *entry)
 443 {
 444         struct usb_device *usb_dev =
 445             to_usb_device_intf(entry->queue->rt2x00dev->dev);
 446         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 447         int pipe;
 448         int status;
 449
 450         entry->flags = 0;
 451
 452         if (entry->queue->qid == QID_RX) {
 453                 pipe = usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint);
 454                 usb_fill_bulk_urb(entry_priv->urb, usb_dev, pipe,
 455                                 entry->skb->data, entry->skb->len,
 456                                 rt2x00usb_interrupt_rxdone, entry);
 457
 458                 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 459
 460                 status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 461                 if (status) {
 462                         if (status == -ENODEV)
 463                                 clear_bit(DEVICE_STATE_PRESENT,
 464                                           &entry->queue->rt2x00dev->flags);
 465                         set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 466                         rt2x00lib_dmadone(entry);
 467                 }
 468         }
 469 }
 470 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 471
 472 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 473                                       struct usb_endpoint_descriptor *ep_desc)
 474 {
 475         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 476         int pipe;
 477
 478         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 479
 480         if (queue->qid == QID_RX) {
 481                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 482                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 483         } else {
 484                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 485                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 486         }
 487
 488         if (!queue->usb_maxpacket)
 489                 queue->usb_maxpacket = 1;
 490 }
 491
 492 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 493 {
 494         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 495         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 496         struct usb_endpoint_descriptor *ep_desc;
 497         struct data_queue *queue = rt2x00dev->tx;
 498         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 499         unsigned int i;
 500
 501         /*
 502          * Walk through all available endpoints to search for "bulk in"
 503          * and "bulk out" endpoints. When we find such endpoints collect
 504          * the information we need from the descriptor and assign it
 505          * to the queue.
 506          */
 507         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 508                 ep_desc = &intf_desc->endpoint[i].desc;
 509
 510                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 511                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 512                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 513                            (queue != queue_end(rt2x00dev))) {
 514                         rt2x00usb_assign_endpoint(queue, ep_desc);
 515                         queue = queue_next(queue);
 516
 517                         tx_ep_desc = ep_desc;
 518                 }
 519         }
 520
 521         /*
 522          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 523          */
 524         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 525                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 526                 return -EPIPE;
 527         }
 528
 529         /*
 530          * It might be possible not all queues have a dedicated endpoint.
 531          * Loop through all TX queues and copy the endpoint information
 532          * which we have gathered from already assigned endpoints.
 533          */
 534         txall_queue_for_each(rt2x00dev, queue) {
 535                 if (!queue->usb_endpoint)
 536                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 537         }
 538
 539         return 0;
 540 }
 541
 542 static int rt2x00usb_alloc_entries(struct data_queue *queue)
 543 {
 544         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 545         struct queue_entry_priv_usb *entry_priv;
 546         struct queue_entry_priv_usb_bcn *bcn_priv;
 547         unsigned int i;
 548
 549         for (i = 0; i < queue->limit; i++) {
 550                 entry_priv = queue->entries[i].priv_data;
 551                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 552                 if (!entry_priv->urb)
 553                         return -ENOMEM;
 554         }
 555
 556         /*
 557          * If this is not the beacon queue or
 558          * no guardian byte was required for the beacon,
 559          * then we are done.
 560          */
 561         if (queue->qid != QID_BEACON ||
 562             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 563                 return 0;
 564
 565         for (i = 0; i < queue->limit; i++) {
 566                 bcn_priv = queue->entries[i].priv_data;
 567                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 568                 if (!bcn_priv->guardian_urb)
 569                         return -ENOMEM;
 570         }
 571
 572         return 0;
 573 }
 574
 575 static void rt2x00usb_free_entries(struct data_queue *queue)
 576 {
 577         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 578         struct queue_entry_priv_usb *entry_priv;
 579         struct queue_entry_priv_usb_bcn *bcn_priv;
 580         unsigned int i;
 581
 582         if (!queue->entries)
 583                 return;
 584
 585         for (i = 0; i < queue->limit; i++) {
 586                 entry_priv = queue->entries[i].priv_data;
 587                 usb_kill_urb(entry_priv->urb);
 588                 usb_free_urb(entry_priv->urb);
 589         }
 590
 591         /*
 592          * If this is not the beacon queue or
 593          * no guardian byte was required for the beacon,
 594          * then we are done.
 595          */
 596         if (queue->qid != QID_BEACON ||
 597             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 598                 return;
 599
 600         for (i = 0; i < queue->limit; i++) {
 601                 bcn_priv = queue->entries[i].priv_data;
 602                 usb_kill_urb(bcn_priv->guardian_urb);
 603                 usb_free_urb(bcn_priv->guardian_urb);
 604         }
 605 }
 606
 607 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 608 {
 609         struct data_queue *queue;
 610         int status;
 611
 612         /*
 613          * Find endpoints for each queue
 614          */
 615         status = rt2x00usb_find_endpoints(rt2x00dev);
 616         if (status)
 617                 goto exit;
 618
 619         /*
 620          * Allocate DMA
 621          */
 622         queue_for_each(rt2x00dev, queue) {
 623                 status = rt2x00usb_alloc_entries(queue);
 624                 if (status)
 625                         goto exit;
 626         }
 627
 628         return 0;
 629
 630 exit:
 631         rt2x00usb_uninitialize(rt2x00dev);
 632
 633         return status;
 634 }
 635 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 636
 637 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 638 {
 639         struct data_queue *queue;
 640
 641         queue_for_each(rt2x00dev, queue)
 642                 rt2x00usb_free_entries(queue);
 643 }
 644 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 645
 646 /*
 647  * USB driver handlers.
 648  */
 649 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 650 {
 651         kfree(rt2x00dev->rf);
 652         rt2x00dev->rf = NULL;
 653
 654         kfree(rt2x00dev->eeprom);
 655         rt2x00dev->eeprom = NULL;
 656
 657         kfree(rt2x00dev->csr.cache);
 658         rt2x00dev->csr.cache = NULL;
 659 }
 660
 661 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 662 {
 663         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 664         if (!rt2x00dev->csr.cache)
 665                 goto exit;
 666
 667         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 668         if (!rt2x00dev->eeprom)
 669                 goto exit;
 670
 671         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 672         if (!rt2x00dev->rf)
 673                 goto exit;
 674
 675         return 0;
 676
 677 exit:
 678         ERROR_PROBE("Failed to allocate registers.\n");
 679
 680         rt2x00usb_free_reg(rt2x00dev);
 681
 682         return -ENOMEM;
 683 }
 684
 685 int rt2x00usb_probe(struct usb_interface *usb_intf,
 686                     const struct usb_device_id *id)
 687 {
 688         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 689         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 690         struct ieee80211_hw *hw;
 691         struct rt2x00_dev *rt2x00dev;
 692         int retval;
 693
 694         usb_dev = usb_get_dev(usb_dev);
 695
 696         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 697         if (!hw) {
 698                 ERROR_PROBE("Failed to allocate hardware.\n");
 699                 retval = -ENOMEM;
 700                 goto exit_put_device;
 701         }
 702
 703         usb_set_intfdata(usb_intf, hw);
 704
 705         rt2x00dev = hw->priv;
 706         rt2x00dev->dev = &usb_intf->dev;
 707         rt2x00dev->ops = ops;
 708         rt2x00dev->hw = hw;
 709
 710         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 711
 712         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 713         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 714
 715         retval = rt2x00usb_alloc_reg(rt2x00dev);
 716         if (retval)
 717                 goto exit_free_device;
 718
 719         retval = rt2x00lib_probe_dev(rt2x00dev);
 720         if (retval)
 721                 goto exit_free_reg;
 722
 723         return 0;
 724
 725 exit_free_reg:
 726         rt2x00usb_free_reg(rt2x00dev);
 727
 728 exit_free_device:
 729         ieee80211_free_hw(hw);
 730
 731 exit_put_device:
 732         usb_put_dev(usb_dev);
 733
 734         usb_set_intfdata(usb_intf, NULL);
 735
 736         return retval;
 737 }
 738 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 739
 740 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 741 {
 742         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 743         struct rt2x00_dev *rt2x00dev = hw->priv;
 744
 745         /*
 746          * Free all allocated data.
 747          */
 748         rt2x00lib_remove_dev(rt2x00dev);
 749         rt2x00usb_free_reg(rt2x00dev);
 750         ieee80211_free_hw(hw);
 751
 752         /*
 753          * Free the USB device data.
 754          */
 755         usb_set_intfdata(usb_intf, NULL);
 756         usb_put_dev(interface_to_usbdev(usb_intf));
 757 }
 758 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 759
 760 #ifdef CONFIG_PM
 761 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 762 {
 763         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 764         struct rt2x00_dev *rt2x00dev = hw->priv;
 765         int retval;
 766
 767         retval = rt2x00lib_suspend(rt2x00dev, state);
 768         if (retval)
 769                 return retval;
 770
 771         /*
 772          * Decrease usbdev refcount.
 773          */
 774         usb_put_dev(interface_to_usbdev(usb_intf));
 775
 776         return 0;
 777 }
 778 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 779
 780 int rt2x00usb_resume(struct usb_interface *usb_intf)
 781 {
 782         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 783         struct rt2x00_dev *rt2x00dev = hw->priv;
 784
 785         usb_get_dev(interface_to_usbdev(usb_intf));
 786
 787         return rt2x00lib_resume(rt2x00dev);
 788 }
 789 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 790 #endif /* CONFIG_PM */
 791
 792 /*
 793  * rt2x00usb module information.
 794  */
 795 MODULE_AUTHOR(DRV_PROJECT);
 796 MODULE_VERSION(DRV_VERSION);
 797 MODULE_DESCRIPTION("rt2x00 usb library");
 798 MODULE_LICENSE("GPL");