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_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags) ||
 212             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 213                 return;
 214
 215         /*
 216          * Check if the frame was correctly uploaded
 217          */
 218         if (urb->status)
 219                 __set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 220
 221         /*
 222          * Schedule the delayed work for reading the TX status
 223          * from the device.
 224          */
 225         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->txdone_work);
 226 }
 227
 228 static inline void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
 229 {
 230         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 231         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 232         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 233         u32 length;
 234
 235         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags))
 236                 return;
 237
 238         /*
 239          * USB devices cannot blindly pass the skb->len as the
 240          * length of the data to usb_fill_bulk_urb. Pass the skb
 241          * to the driver to determine what the length should be.
 242          */
 243         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 244
 245         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 246                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
 247                           entry->skb->data, length,
 248                           rt2x00usb_interrupt_txdone, entry);
 249
 250         usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 251 }
 252
 253 void rt2x00usb_kick_tx_queue(struct data_queue *queue)
 254 {
 255         unsigned long irqflags;
 256         unsigned int index;
 257         unsigned int index_done;
 258         unsigned int i;
 259
 260         /*
 261          * Only protect the range we are going to loop over,
 262          * if during our loop a extra entry is set to pending
 263          * it should not be kicked during this run, since it
 264          * is part of another TX operation.
 265          */
 266         spin_lock_irqsave(&queue->lock, irqflags);
 267         index = queue->index[Q_INDEX];
 268         index_done = queue->index[Q_INDEX_DONE];
 269         spin_unlock_irqrestore(&queue->lock, irqflags);
 270
 271         /*
 272          * Start from the TX done pointer, this guarentees that we will
 273          * send out all frames in the correct order.
 274          */
 275         if (index_done < index) {
 276                 for (i = index_done; i < index; i++)
 277                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 278         } else {
 279                 for (i = index_done; i < queue->limit; i++)
 280                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 281
 282                 for (i = 0; i < index; i++)
 283                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 284         }
 285 }
 286 EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue);
 287
 288 void rt2x00usb_kill_tx_queue(struct data_queue *queue)
 289 {
 290         struct queue_entry_priv_usb *entry_priv;
 291         struct queue_entry_priv_usb_bcn *bcn_priv;
 292         unsigned int i;
 293         bool kill_guard;
 294
 295         /*
 296          * When killing the beacon queue, we must also kill
 297          * the beacon guard byte.
 298          */
 299         kill_guard =
 300             (queue->qid == QID_BEACON) &&
 301             (test_bit(DRIVER_REQUIRE_BEACON_GUARD, &queue->rt2x00dev->flags));
 302
 303         /*
 304          * Cancel all entries.
 305          */
 306         for (i = 0; i < queue->limit; i++) {
 307                 entry_priv = queue->entries[i].priv_data;
 308                 usb_kill_urb(entry_priv->urb);
 309
 310                 /*
 311                  * Kill guardian urb (if required by driver).
 312                  */
 313                 if (kill_guard) {
 314                         bcn_priv = queue->entries[i].priv_data;
 315                         usb_kill_urb(bcn_priv->guardian_urb);
 316                 }
 317         }
 318 }
 319 EXPORT_SYMBOL_GPL(rt2x00usb_kill_tx_queue);
 320
 321 static void rt2x00usb_watchdog_reset_tx(struct data_queue *queue)
 322 {
 323         struct queue_entry *entry;
 324         struct queue_entry_priv_usb *entry_priv;
 325         unsigned short threshold = queue->threshold;
 326
 327         WARNING(queue->rt2x00dev, "TX queue %d timed out, invoke reset", queue->qid);
 328
 329         /*
 330          * Temporarily disable the TX queue, this will force mac80211
 331          * to use the other queues until this queue has been restored.
 332          *
 333          * Set the queue threshold to the queue limit. This prevents the
 334          * queue from being enabled during the txdone handler.
 335          */
 336         queue->threshold = queue->limit;
 337         ieee80211_stop_queue(queue->rt2x00dev->hw, queue->qid);
 338
 339         /*
 340          * Reset all currently uploaded TX frames.
 341          */
 342         while (!rt2x00queue_empty(queue)) {
 343                 entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 344                 entry_priv = entry->priv_data;
 345                 usb_kill_urb(entry_priv->urb);
 346
 347                 /*
 348                  * We need a short delay here to wait for
 349                  * the URB to be canceled
 350                  */
 351                 do {
 352                         udelay(100);
 353                 } while (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags));
 354
 355                 /*
 356                  * Invoke the TX done handler
 357                  */
 358                 rt2x00usb_work_txdone_entry(entry);
 359         }
 360
 361         /*
 362          * The queue has been reset, and mac80211 is allowed to use the
 363          * queue again.
 364          */
 365         queue->threshold = threshold;
 366         ieee80211_wake_queue(queue->rt2x00dev->hw, queue->qid);
 367 }
 368
 369 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 370 {
 371         struct data_queue *queue;
 372
 373         tx_queue_for_each(rt2x00dev, queue) {
 374                 if (rt2x00queue_timeout(queue))
 375                         rt2x00usb_watchdog_reset_tx(queue);
 376         }
 377 }
 378 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
 379
 380 /*
 381  * RX data handlers.
 382  */
 383 static void rt2x00usb_work_rxdone(struct work_struct *work)
 384 {
 385         struct rt2x00_dev *rt2x00dev =
 386             container_of(work, struct rt2x00_dev, rxdone_work);
 387         struct queue_entry *entry;
 388         struct skb_frame_desc *skbdesc;
 389         u8 rxd[32];
 390
 391         while (!rt2x00queue_empty(rt2x00dev->rx)) {
 392                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
 393
 394                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 395                         break;
 396
 397                 /*
 398                  * Fill in desc fields of the skb descriptor
 399                  */
 400                 skbdesc = get_skb_frame_desc(entry->skb);
 401                 skbdesc->desc = rxd;
 402                 skbdesc->desc_len = entry->queue->desc_size;
 403
 404                 /*
 405                  * Send the frame to rt2x00lib for further processing.
 406                  */
 407                 rt2x00lib_rxdone(rt2x00dev, entry);
 408         }
 409 }
 410
 411 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 412 {
 413         struct queue_entry *entry = (struct queue_entry *)urb->context;
 414         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 415
 416         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags) ||
 417             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 418                 return;
 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         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->rxdone_work);
 433 }
 434
 435 /*
 436  * Radio handlers
 437  */
 438 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 439 {
 440         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 441                                     REGISTER_TIMEOUT);
 442
 443         /*
 444          * The USB version of kill_tx_queue also works
 445          * on the RX queue.
 446          */
 447         rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev->rx);
 448 }
 449 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 450
 451 /*
 452  * Device initialization handlers.
 453  */
 454 void rt2x00usb_clear_entry(struct queue_entry *entry)
 455 {
 456         struct usb_device *usb_dev =
 457             to_usb_device_intf(entry->queue->rt2x00dev->dev);
 458         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 459         int pipe;
 460
 461         entry->flags = 0;
 462
 463         if (entry->queue->qid == QID_RX) {
 464                 pipe = usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint);
 465                 usb_fill_bulk_urb(entry_priv->urb, usb_dev, pipe,
 466                                 entry->skb->data, entry->skb->len,
 467                                 rt2x00usb_interrupt_rxdone, entry);
 468
 469                 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 470                 usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 471         }
 472 }
 473 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 474
 475 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
 476                                       struct usb_endpoint_descriptor *ep_desc)
 477 {
 478         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
 479         int pipe;
 480
 481         queue->usb_endpoint = usb_endpoint_num(ep_desc);
 482
 483         if (queue->qid == QID_RX) {
 484                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
 485                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
 486         } else {
 487                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
 488                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
 489         }
 490
 491         if (!queue->usb_maxpacket)
 492                 queue->usb_maxpacket = 1;
 493 }
 494
 495 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 496 {
 497         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
 498         struct usb_host_interface *intf_desc = intf->cur_altsetting;
 499         struct usb_endpoint_descriptor *ep_desc;
 500         struct data_queue *queue = rt2x00dev->tx;
 501         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
 502         unsigned int i;
 503
 504         /*
 505          * Walk through all available endpoints to search for "bulk in"
 506          * and "bulk out" endpoints. When we find such endpoints collect
 507          * the information we need from the descriptor and assign it
 508          * to the queue.
 509          */
 510         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 511                 ep_desc = &intf_desc->endpoint[i].desc;
 512
 513                 if (usb_endpoint_is_bulk_in(ep_desc)) {
 514                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
 515                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
 516                            (queue != queue_end(rt2x00dev))) {
 517                         rt2x00usb_assign_endpoint(queue, ep_desc);
 518                         queue = queue_next(queue);
 519
 520                         tx_ep_desc = ep_desc;
 521                 }
 522         }
 523
 524         /*
 525          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
 526          */
 527         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
 528                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
 529                 return -EPIPE;
 530         }
 531
 532         /*
 533          * It might be possible not all queues have a dedicated endpoint.
 534          * Loop through all TX queues and copy the endpoint information
 535          * which we have gathered from already assigned endpoints.
 536          */
 537         txall_queue_for_each(rt2x00dev, queue) {
 538                 if (!queue->usb_endpoint)
 539                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
 540         }
 541
 542         return 0;
 543 }
 544
 545 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 546                                struct data_queue *queue)
 547 {
 548         struct queue_entry_priv_usb *entry_priv;
 549         struct queue_entry_priv_usb_bcn *bcn_priv;
 550         unsigned int i;
 551
 552         for (i = 0; i < queue->limit; i++) {
 553                 entry_priv = queue->entries[i].priv_data;
 554                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 555                 if (!entry_priv->urb)
 556                         return -ENOMEM;
 557         }
 558
 559         /*
 560          * If this is not the beacon queue or
 561          * no guardian byte was required for the beacon,
 562          * then we are done.
 563          */
 564         if (rt2x00dev->bcn != queue ||
 565             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 566                 return 0;
 567
 568         for (i = 0; i < queue->limit; i++) {
 569                 bcn_priv = queue->entries[i].priv_data;
 570                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 571                 if (!bcn_priv->guardian_urb)
 572                         return -ENOMEM;
 573         }
 574
 575         return 0;
 576 }
 577
 578 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 579                                struct data_queue *queue)
 580 {
 581         struct queue_entry_priv_usb *entry_priv;
 582         struct queue_entry_priv_usb_bcn *bcn_priv;
 583         unsigned int i;
 584
 585         if (!queue->entries)
 586                 return;
 587
 588         for (i = 0; i < queue->limit; i++) {
 589                 entry_priv = queue->entries[i].priv_data;
 590                 usb_kill_urb(entry_priv->urb);
 591                 usb_free_urb(entry_priv->urb);
 592         }
 593
 594         /*
 595          * If this is not the beacon queue or
 596          * no guardian byte was required for the beacon,
 597          * then we are done.
 598          */
 599         if (rt2x00dev->bcn != queue ||
 600             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 601                 return;
 602
 603         for (i = 0; i < queue->limit; i++) {
 604                 bcn_priv = queue->entries[i].priv_data;
 605                 usb_kill_urb(bcn_priv->guardian_urb);
 606                 usb_free_urb(bcn_priv->guardian_urb);
 607         }
 608 }
 609
 610 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 611 {
 612         struct data_queue *queue;
 613         int status;
 614
 615         /*
 616          * Find endpoints for each queue
 617          */
 618         status = rt2x00usb_find_endpoints(rt2x00dev);
 619         if (status)
 620                 goto exit;
 621
 622         /*
 623          * Allocate DMA
 624          */
 625         queue_for_each(rt2x00dev, queue) {
 626                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
 627                 if (status)
 628                         goto exit;
 629         }
 630
 631         return 0;
 632
 633 exit:
 634         rt2x00usb_uninitialize(rt2x00dev);
 635
 636         return status;
 637 }
 638 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 639
 640 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 641 {
 642         struct data_queue *queue;
 643
 644         queue_for_each(rt2x00dev, queue)
 645                 rt2x00usb_free_urb(rt2x00dev, queue);
 646 }
 647 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 648
 649 /*
 650  * USB driver handlers.
 651  */
 652 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 653 {
 654         kfree(rt2x00dev->rf);
 655         rt2x00dev->rf = NULL;
 656
 657         kfree(rt2x00dev->eeprom);
 658         rt2x00dev->eeprom = NULL;
 659
 660         kfree(rt2x00dev->csr.cache);
 661         rt2x00dev->csr.cache = NULL;
 662 }
 663
 664 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 665 {
 666         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 667         if (!rt2x00dev->csr.cache)
 668                 goto exit;
 669
 670         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 671         if (!rt2x00dev->eeprom)
 672                 goto exit;
 673
 674         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 675         if (!rt2x00dev->rf)
 676                 goto exit;
 677
 678         return 0;
 679
 680 exit:
 681         ERROR_PROBE("Failed to allocate registers.\n");
 682
 683         rt2x00usb_free_reg(rt2x00dev);
 684
 685         return -ENOMEM;
 686 }
 687
 688 int rt2x00usb_probe(struct usb_interface *usb_intf,
 689                     const struct usb_device_id *id)
 690 {
 691         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 692         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 693         struct ieee80211_hw *hw;
 694         struct rt2x00_dev *rt2x00dev;
 695         int retval;
 696
 697         usb_dev = usb_get_dev(usb_dev);
 698
 699         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 700         if (!hw) {
 701                 ERROR_PROBE("Failed to allocate hardware.\n");
 702                 retval = -ENOMEM;
 703                 goto exit_put_device;
 704         }
 705
 706         usb_set_intfdata(usb_intf, hw);
 707
 708         rt2x00dev = hw->priv;
 709         rt2x00dev->dev = &usb_intf->dev;
 710         rt2x00dev->ops = ops;
 711         rt2x00dev->hw = hw;
 712
 713         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
 714
 715         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
 716         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
 717
 718         retval = rt2x00usb_alloc_reg(rt2x00dev);
 719         if (retval)
 720                 goto exit_free_device;
 721
 722         retval = rt2x00lib_probe_dev(rt2x00dev);
 723         if (retval)
 724                 goto exit_free_reg;
 725
 726         return 0;
 727
 728 exit_free_reg:
 729         rt2x00usb_free_reg(rt2x00dev);
 730
 731 exit_free_device:
 732         ieee80211_free_hw(hw);
 733
 734 exit_put_device:
 735         usb_put_dev(usb_dev);
 736
 737         usb_set_intfdata(usb_intf, NULL);
 738
 739         return retval;
 740 }
 741 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 742
 743 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 744 {
 745         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 746         struct rt2x00_dev *rt2x00dev = hw->priv;
 747
 748         /*
 749          * Free all allocated data.
 750          */
 751         rt2x00lib_remove_dev(rt2x00dev);
 752         rt2x00usb_free_reg(rt2x00dev);
 753         ieee80211_free_hw(hw);
 754
 755         /*
 756          * Free the USB device data.
 757          */
 758         usb_set_intfdata(usb_intf, NULL);
 759         usb_put_dev(interface_to_usbdev(usb_intf));
 760 }
 761 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 762
 763 #ifdef CONFIG_PM
 764 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 765 {
 766         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 767         struct rt2x00_dev *rt2x00dev = hw->priv;
 768         int retval;
 769
 770         retval = rt2x00lib_suspend(rt2x00dev, state);
 771         if (retval)
 772                 return retval;
 773
 774         /*
 775          * Decrease usbdev refcount.
 776          */
 777         usb_put_dev(interface_to_usbdev(usb_intf));
 778
 779         return 0;
 780 }
 781 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 782
 783 int rt2x00usb_resume(struct usb_interface *usb_intf)
 784 {
 785         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 786         struct rt2x00_dev *rt2x00dev = hw->priv;
 787
 788         usb_get_dev(interface_to_usbdev(usb_intf));
 789
 790         return rt2x00lib_resume(rt2x00dev);
 791 }
 792 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 793 #endif /* CONFIG_PM */
 794
 795 /*
 796  * rt2x00usb module information.
 797  */
 798 MODULE_AUTHOR(DRV_PROJECT);
 799 MODULE_VERSION(DRV_VERSION);
 800 MODULE_DESCRIPTION("rt2x00 usb library");
 801 MODULE_LICENSE("GPL");