git.oblomov.eu Git - linux-2.6/blob - drivers/net/wireless/rt2x00/rt2x00usb.c

   1 /*
   2         Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00usb
  23         Abstract: rt2x00 generic usb device routines.
  24  */
  25
  26 /*
  27  * Set enviroment defines for rt2x00.h
  28  */
  29 #define DRV_NAME "rt2x00usb"
  30
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33 #include <linux/usb.h>
  34
  35 #include "rt2x00.h"
  36 #include "rt2x00usb.h"
  37
  38 /*
  39  * Interfacing with the HW.
  40  */
  41 int rt2x00usb_vendor_request(const struct rt2x00_dev *rt2x00dev,
  42                              const u8 request, const u8 requesttype,
  43                              const u16 offset, const u16 value,
  44                              void *buffer, const u16 buffer_length,
  45                              const int timeout)
  46 {
  47         struct usb_device *usb_dev =
  48             interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
  49         int status;
  50         unsigned int i;
  51         unsigned int pipe =
  52             (requesttype == USB_VENDOR_REQUEST_IN) ?
  53             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
  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                         break;
  69         }
  70
  71         ERROR(rt2x00dev,
  72               "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
  73               request, offset, status);
  74
  75         return status;
  76 }
  77 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
  78
  79 int rt2x00usb_vendor_request_buff(const struct rt2x00_dev *rt2x00dev,
  80                                   const u8 request, const u8 requesttype,
  81                                   const u16 offset, void *buffer,
  82                                   const u16 buffer_length, const int timeout)
  83 {
  84         int status;
  85
  86         /*
  87          * Check for Cache availability.
  88          */
  89         if (unlikely(!rt2x00dev->csr_cache || buffer_length > CSR_CACHE_SIZE)) {
  90                 ERROR(rt2x00dev, "CSR cache not available.\n");
  91                 return -ENOMEM;
  92         }
  93
  94         if (requesttype == USB_VENDOR_REQUEST_OUT)
  95                 memcpy(rt2x00dev->csr_cache, buffer, buffer_length);
  96
  97         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
  98                                           offset, 0, rt2x00dev->csr_cache,
  99                                           buffer_length, timeout);
 100
 101         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
 102                 memcpy(buffer, rt2x00dev->csr_cache, buffer_length);
 103
 104         return status;
 105 }
 106 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 107
 108 /*
 109  * TX data handlers.
 110  */
 111 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 112 {
 113         struct data_entry *entry = (struct data_entry *)urb->context;
 114         struct data_ring *ring = entry->ring;
 115         struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
 116         struct data_desc *txd = (struct data_desc *)entry->skb->data;
 117         u32 word;
 118         int tx_status;
 119
 120         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 121             !__test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
 122                 return;
 123
 124         rt2x00_desc_read(txd, 0, &word);
 125
 126         /*
 127          * Remove the descriptor data from the buffer.
 128          */
 129         skb_pull(entry->skb, ring->desc_size);
 130
 131         /*
 132          * Obtain the status about this packet.
 133          */
 134         tx_status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY;
 135
 136         rt2x00lib_txdone(entry, tx_status, 0);
 137
 138         /*
 139          * Make this entry available for reuse.
 140          */
 141         entry->flags = 0;
 142         rt2x00_ring_index_done_inc(entry->ring);
 143
 144         /*
 145          * If the data ring was full before the txdone handler
 146          * we must make sure the packet queue in the mac80211 stack
 147          * is reenabled when the txdone handler has finished.
 148          */
 149         if (!rt2x00_ring_full(ring))
 150                 ieee80211_wake_queue(rt2x00dev->hw,
 151                                      entry->tx_status.control.queue);
 152 }
 153
 154 int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
 155                             struct data_ring *ring, struct sk_buff *skb,
 156                             struct ieee80211_tx_control *control)
 157 {
 158         struct usb_device *usb_dev =
 159             interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
 160         struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
 161         struct data_entry *entry = rt2x00_get_data_entry(ring);
 162         u32 length = skb->len;
 163
 164         if (rt2x00_ring_full(ring)) {
 165                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 166                 return -EINVAL;
 167         }
 168
 169         if (test_bit(ENTRY_OWNER_NIC, &entry->flags)) {
 170                 ERROR(rt2x00dev,
 171                       "Arrived at non-free entry in the non-full queue %d.\n"
 172                       "Please file bug report to %s.\n",
 173                       control->queue, DRV_PROJECT);
 174                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 175                 return -EINVAL;
 176         }
 177
 178         /*
 179          * Add the descriptor in front of the skb.
 180          */
 181         skb_push(skb, rt2x00dev->hw->extra_tx_headroom);
 182         memset(skb->data, 0x00, rt2x00dev->hw->extra_tx_headroom);
 183
 184         rt2x00lib_write_tx_desc(rt2x00dev, (struct data_desc *)skb->data,
 185                                 ieee80211hdr, length, control);
 186         memcpy(&entry->tx_status.control, control, sizeof(*control));
 187         entry->skb = skb;
 188
 189         /*
 190          * Length passed to usb_fill_urb cannot be an odd number,
 191          * so add 1 byte to make it even.
 192          */
 193         length += rt2x00dev->hw->extra_tx_headroom;
 194         if (length % 2)
 195                 length++;
 196
 197         __set_bit(ENTRY_OWNER_NIC, &entry->flags);
 198         usb_fill_bulk_urb(entry->priv, usb_dev,
 199                           usb_sndbulkpipe(usb_dev, 1),
 200                           skb->data, length, rt2x00usb_interrupt_txdone, entry);
 201         usb_submit_urb(entry->priv, GFP_ATOMIC);
 202
 203         rt2x00_ring_index_inc(ring);
 204
 205         if (rt2x00_ring_full(ring))
 206                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 207
 208         return 0;
 209 }
 210 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
 211
 212 /*
 213  * RX data handlers.
 214  */
 215 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 216 {
 217         struct data_entry *entry = (struct data_entry *)urb->context;
 218         struct data_ring *ring = entry->ring;
 219         struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
 220         struct sk_buff *skb;
 221         struct rxdata_entry_desc desc;
 222         int frame_size;
 223
 224         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 225             !test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
 226                 return;
 227
 228         /*
 229          * Check if the received data is simply too small
 230          * to be actually valid, or if the urb is signaling
 231          * a problem.
 232          */
 233         if (urb->actual_length < entry->ring->desc_size || urb->status)
 234                 goto skip_entry;
 235
 236         memset(&desc, 0x00, sizeof(desc));
 237         rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
 238
 239         /*
 240          * Allocate a new sk buffer to replace the current one.
 241          * If allocation fails, we should drop the current frame
 242          * so we can recycle the existing sk buffer for the new frame.
 243          */
 244         frame_size = entry->ring->data_size + entry->ring->desc_size;
 245         skb = dev_alloc_skb(frame_size + NET_IP_ALIGN);
 246         if (!skb)
 247                 goto skip_entry;
 248
 249         skb_reserve(skb, NET_IP_ALIGN);
 250         skb_put(skb, frame_size);
 251
 252         /*
 253          * Trim the skb_buffer to only contain the valid
 254          * frame data (so ignore the device's descriptor).
 255          */
 256         skb_trim(entry->skb, desc.size);
 257
 258         /*
 259          * Send the frame to rt2x00lib for further processing.
 260          */
 261         rt2x00lib_rxdone(entry, entry->skb, &desc);
 262
 263         /*
 264          * Replace current entry's skb with the newly allocated one,
 265          * and reinitialize the urb.
 266          */
 267         entry->skb = skb;
 268         urb->transfer_buffer = entry->skb->data;
 269         urb->transfer_buffer_length = entry->skb->len;
 270
 271 skip_entry:
 272         if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
 273                 __set_bit(ENTRY_OWNER_NIC, &entry->flags);
 274                 usb_submit_urb(urb, GFP_ATOMIC);
 275         }
 276
 277         rt2x00_ring_index_inc(ring);
 278 }
 279
 280 /*
 281  * Radio handlers
 282  */
 283 void rt2x00usb_enable_radio(struct rt2x00_dev *rt2x00dev)
 284 {
 285         struct usb_device *usb_dev =
 286             interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
 287         struct data_ring *ring;
 288         struct data_entry *entry;
 289         unsigned int i;
 290
 291         /*
 292          * Initialize the TX rings
 293          */
 294         txringall_for_each(rt2x00dev, ring) {
 295                 for (i = 0; i < ring->stats.limit; i++)
 296                         ring->entry[i].flags = 0;
 297
 298                 rt2x00_ring_index_clear(ring);
 299         }
 300
 301         /*
 302          * Initialize and start the RX ring.
 303          */
 304         rt2x00_ring_index_clear(rt2x00dev->rx);
 305
 306         for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
 307                 entry = &rt2x00dev->rx->entry[i];
 308
 309                 usb_fill_bulk_urb(entry->priv, usb_dev,
 310                                   usb_rcvbulkpipe(usb_dev, 1),
 311                                   entry->skb->data, entry->skb->len,
 312                                   rt2x00usb_interrupt_rxdone, entry);
 313
 314                 __set_bit(ENTRY_OWNER_NIC, &entry->flags);
 315                 usb_submit_urb(entry->priv, GFP_ATOMIC);
 316         }
 317 }
 318 EXPORT_SYMBOL_GPL(rt2x00usb_enable_radio);
 319
 320 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 321 {
 322         struct data_ring *ring;
 323         unsigned int i;
 324
 325         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
 326                                     REGISTER_TIMEOUT);
 327
 328         /*
 329          * Cancel all rings.
 330          */
 331         ring_for_each(rt2x00dev, ring) {
 332                 for (i = 0; i < ring->stats.limit; i++)
 333                         usb_kill_urb(ring->entry[i].priv);
 334         }
 335 }
 336 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 337
 338 /*
 339  * Device initialization handlers.
 340  */
 341 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 342                                struct data_ring *ring)
 343 {
 344         unsigned int i;
 345
 346         /*
 347          * Allocate the URB's
 348          */
 349         for (i = 0; i < ring->stats.limit; i++) {
 350                 ring->entry[i].priv = usb_alloc_urb(0, GFP_KERNEL);
 351                 if (!ring->entry[i].priv)
 352                         return -ENOMEM;
 353         }
 354
 355         return 0;
 356 }
 357
 358 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 359                                struct data_ring *ring)
 360 {
 361         unsigned int i;
 362
 363         if (!ring->entry)
 364                 return;
 365
 366         for (i = 0; i < ring->stats.limit; i++) {
 367                 usb_kill_urb(ring->entry[i].priv);
 368                 usb_free_urb(ring->entry[i].priv);
 369                 if (ring->entry[i].skb)
 370                         kfree_skb(ring->entry[i].skb);
 371         }
 372 }
 373
 374 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 375 {
 376         struct data_ring *ring;
 377         struct sk_buff *skb;
 378         unsigned int entry_size;
 379         unsigned int i;
 380         int status;
 381
 382         /*
 383          * Allocate DMA
 384          */
 385         ring_for_each(rt2x00dev, ring) {
 386                 status = rt2x00usb_alloc_urb(rt2x00dev, ring);
 387                 if (status)
 388                         goto exit;
 389         }
 390
 391         /*
 392          * For the RX ring, skb's should be allocated.
 393          */
 394         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
 395         for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
 396                 skb = dev_alloc_skb(NET_IP_ALIGN + entry_size);
 397                 if (!skb)
 398                         goto exit;
 399
 400                 skb_reserve(skb, NET_IP_ALIGN);
 401                 skb_put(skb, entry_size);
 402
 403                 rt2x00dev->rx->entry[i].skb = skb;
 404         }
 405
 406         return 0;
 407
 408 exit:
 409         rt2x00usb_uninitialize(rt2x00dev);
 410
 411         return status;
 412 }
 413 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 414
 415 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 416 {
 417         struct data_ring *ring;
 418
 419         ring_for_each(rt2x00dev, ring)
 420                 rt2x00usb_free_urb(rt2x00dev, ring);
 421 }
 422 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 423
 424 /*
 425  * USB driver handlers.
 426  */
 427 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 428 {
 429         kfree(rt2x00dev->rf);
 430         rt2x00dev->rf = NULL;
 431
 432         kfree(rt2x00dev->eeprom);
 433         rt2x00dev->eeprom = NULL;
 434
 435         kfree(rt2x00dev->csr_cache);
 436         rt2x00dev->csr_cache = NULL;
 437 }
 438
 439 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 440 {
 441         rt2x00dev->csr_cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 442         if (!rt2x00dev->csr_cache)
 443                 goto exit;
 444
 445         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 446         if (!rt2x00dev->eeprom)
 447                 goto exit;
 448
 449         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 450         if (!rt2x00dev->rf)
 451                 goto exit;
 452
 453         return 0;
 454
 455 exit:
 456         ERROR_PROBE("Failed to allocate registers.\n");
 457
 458         rt2x00usb_free_reg(rt2x00dev);
 459
 460         return -ENOMEM;
 461 }
 462
 463 int rt2x00usb_probe(struct usb_interface *usb_intf,
 464                     const struct usb_device_id *id)
 465 {
 466         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 467         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 468         struct ieee80211_hw *hw;
 469         struct rt2x00_dev *rt2x00dev;
 470         int retval;
 471
 472         usb_dev = usb_get_dev(usb_dev);
 473
 474         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 475         if (!hw) {
 476                 ERROR_PROBE("Failed to allocate hardware.\n");
 477                 retval = -ENOMEM;
 478                 goto exit_put_device;
 479         }
 480
 481         usb_set_intfdata(usb_intf, hw);
 482
 483         rt2x00dev = hw->priv;
 484         rt2x00dev->dev = usb_intf;
 485         rt2x00dev->ops = ops;
 486         rt2x00dev->hw = hw;
 487
 488         retval = rt2x00usb_alloc_reg(rt2x00dev);
 489         if (retval)
 490                 goto exit_free_device;
 491
 492         retval = rt2x00lib_probe_dev(rt2x00dev);
 493         if (retval)
 494                 goto exit_free_reg;
 495
 496         return 0;
 497
 498 exit_free_reg:
 499         rt2x00usb_free_reg(rt2x00dev);
 500
 501 exit_free_device:
 502         ieee80211_free_hw(hw);
 503
 504 exit_put_device:
 505         usb_put_dev(usb_dev);
 506
 507         usb_set_intfdata(usb_intf, NULL);
 508
 509         return retval;
 510 }
 511 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 512
 513 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 514 {
 515         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 516         struct rt2x00_dev *rt2x00dev = hw->priv;
 517
 518         /*
 519          * Free all allocated data.
 520          */
 521         rt2x00lib_remove_dev(rt2x00dev);
 522         rt2x00usb_free_reg(rt2x00dev);
 523         ieee80211_free_hw(hw);
 524
 525         /*
 526          * Free the USB device data.
 527          */
 528         usb_set_intfdata(usb_intf, NULL);
 529         usb_put_dev(interface_to_usbdev(usb_intf));
 530 }
 531 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 532
 533 #ifdef CONFIG_PM
 534 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 535 {
 536         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 537         struct rt2x00_dev *rt2x00dev = hw->priv;
 538         int retval;
 539
 540         retval = rt2x00lib_suspend(rt2x00dev, state);
 541         if (retval)
 542                 return retval;
 543
 544         rt2x00usb_free_reg(rt2x00dev);
 545
 546         /*
 547          * Decrease usbdev refcount.
 548          */
 549         usb_put_dev(interface_to_usbdev(usb_intf));
 550
 551         return 0;
 552 }
 553 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 554
 555 int rt2x00usb_resume(struct usb_interface *usb_intf)
 556 {
 557         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 558         struct rt2x00_dev *rt2x00dev = hw->priv;
 559         int retval;
 560
 561         usb_get_dev(interface_to_usbdev(usb_intf));
 562
 563         retval = rt2x00usb_alloc_reg(rt2x00dev);
 564         if (retval)
 565                 return retval;
 566
 567         retval = rt2x00lib_resume(rt2x00dev);
 568         if (retval)
 569                 goto exit_free_reg;
 570
 571         return 0;
 572
 573 exit_free_reg:
 574         rt2x00usb_free_reg(rt2x00dev);
 575
 576         return retval;
 577 }
 578 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 579 #endif /* CONFIG_PM */
 580
 581 /*
 582  * rt2x00pci module information.
 583  */
 584 MODULE_AUTHOR(DRV_PROJECT);
 585 MODULE_VERSION(DRV_VERSION);
 586 MODULE_DESCRIPTION("rt2x00 library");
 587 MODULE_LICENSE("GPL");