package/rt2x00/src/rt2x00dev.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: rt2x00lib
  23         Abstract: rt2x00 generic device routines.
  24         Supported chipsets: RT2460, RT2560, RT2570,
  25         rt2561, rt2561s, rt2661, rt2571W & rt2671.
  26  */
  27
  28 /*
  29  * Set enviroment defines for rt2x00.h
  30  */
  31 #define DRV_NAME "rt2x00lib"
  32
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/version.h>
  36 #include <linux/init.h>
  37 #include <linux/delay.h>
  38 #include <linux/etherdevice.h>
  39
  40 #include "rt2x00.h"
  41 #include "rt2x00dev.h"
  42
  43 /*
  44  * Radio control handlers.
  45  */
  46 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  47 {
  48         int status;
  49
  50         /*
  51          * Don't enable the radio twice.
  52          * or if the hardware button has been disabled.
  53          */
  54         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
  55             (test_bit(DEVICE_SUPPORT_HW_BUTTON, &rt2x00dev->flags) &&
  56              !test_bit(DEVICE_ENABLED_RADIO_HW, &rt2x00dev->flags)))
  57                 return 0;
  58
  59         status = rt2x00dev->ops->lib->set_device_state(
  60                 rt2x00dev, STATE_RADIO_ON);
  61         if (status)
  62                 return status;
  63
  64         __set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
  65
  66         rt2x00lib_toggle_rx(rt2x00dev, 1);
  67
  68         ieee80211_start_queues(rt2x00dev->hw);
  69
  70         return 0;
  71 }
  72
  73 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  74 {
  75         if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
  76                 return;
  77
  78         ieee80211_stop_queues(rt2x00dev->hw);
  79
  80         rt2x00lib_toggle_rx(rt2x00dev, 0);
  81
  82         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
  83 }
  84
  85 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, int enable)
  86 {
  87         /*
  88          * When we are disabling the rx, we should also stop the link tuner.
  89          */
  90         if (!enable && work_pending(&rt2x00dev->link.work.work))
  91                 rt2x00_stop_link_tune(rt2x00dev);
  92
  93         rt2x00dev->ops->lib->set_device_state(rt2x00dev,
  94                 enable ? STATE_RADIO_RX_ON : STATE_RADIO_RX_OFF);
  95
  96         /*
  97          * When we are enabling the rx, we should also start the link tuner.
  98          */
  99         if (enable)
 100                 rt2x00_start_link_tune(rt2x00dev);
 101 }
 102
 103 static void rt2x00lib_link_tuner(struct work_struct *work)
 104 {
 105         struct rt2x00_dev *rt2x00dev =
 106                 container_of(work, struct rt2x00_dev, link.work.work);
 107         int rssi;
 108
 109         /*
 110          * Update promisc mode (this function will first check
 111          * if updating is really required).
 112          */
 113         rt2x00lib_config_promisc(rt2x00dev, rt2x00dev->interface.promisc);
 114
 115         /*
 116          * Cancel all link tuning if the eeprom has indicated
 117          * it is not required.
 118          */
 119         if (test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 120                 return;
 121
 122         /*
 123          * Retrieve link quality.
 124          * Also convert rssi to dBm using the max_rssi value.
 125          */
 126         rssi = rt2x00_get_link_rssi(&rt2x00dev->link);
 127         rssi -= rt2x00dev->hw->max_rssi;
 128
 129         rt2x00dev->ops->lib->link_tuner(rt2x00dev, rssi);
 130
 131         /*
 132          * Increase tuner counter, and reschedule the next link tuner run.
 133          */
 134         rt2x00dev->link.count++;
 135         queue_delayed_work(rt2x00dev->workqueue, &rt2x00dev->link.work,
 136                 LINK_TUNE_INTERVAL);
 137 }
 138
 139 /*
 140  * Config handlers
 141  */
 142 void rt2x00lib_config_type(struct rt2x00_dev *rt2x00dev, const int type)
 143 {
 144         if (!(is_interface_present(&rt2x00dev->interface) ^
 145               test_bit(INTERFACE_ENABLED, &rt2x00dev->flags)) &&
 146             !(is_monitor_present(&rt2x00dev->interface) ^
 147               test_bit(INTERFACE_ENABLED_MONITOR, &rt2x00dev->flags)))
 148                 return;
 149
 150         rt2x00dev->ops->lib->config_type(rt2x00dev, type);
 151
 152         if (type != IEEE80211_IF_TYPE_MNTR) {
 153                 if (is_interface_present(&rt2x00dev->interface))
 154                         __set_bit(INTERFACE_ENABLED, &rt2x00dev->flags);
 155                 else
 156                         __clear_bit(INTERFACE_ENABLED, &rt2x00dev->flags);
 157         } else {
 158                 if (is_monitor_present(&rt2x00dev->interface))
 159                         __set_bit(INTERFACE_ENABLED_MONITOR,
 160                                 &rt2x00dev->flags);
 161                 else
 162                         __clear_bit(INTERFACE_ENABLED_MONITOR,
 163                                 &rt2x00dev->flags);
 164         }
 165 }
 166
 167 void rt2x00lib_config_phymode(struct rt2x00_dev *rt2x00dev, const int phymode)
 168 {
 169         if (rt2x00dev->rx_status.phymode == phymode)
 170                 return;
 171
 172         rt2x00dev->ops->lib->config_phymode(rt2x00dev, phymode);
 173
 174         rt2x00dev->rx_status.phymode = phymode;
 175 }
 176
 177 void rt2x00lib_config_channel(struct rt2x00_dev *rt2x00dev, const int value,
 178         const int channel, const int freq, const int txpower)
 179 {
 180         if (channel == rt2x00dev->rx_status.channel)
 181                 return;
 182
 183         rt2x00dev->ops->lib->config_channel(rt2x00dev, value, channel, txpower);
 184
 185         INFO(rt2x00dev, "Switching channel. "
 186                 "RF1: 0x%08x, RF2: 0x%08x, RF3: 0x%08x, RF3: 0x%08x.\n",
 187                 rt2x00dev->rf1, rt2x00dev->rf2,
 188                 rt2x00dev->rf3, rt2x00dev->rf4);
 189
 190         rt2x00dev->rx_status.freq = freq;
 191         rt2x00dev->rx_status.channel = channel;
 192 }
 193
 194 void rt2x00lib_config_promisc(struct rt2x00_dev *rt2x00dev, const int promisc)
 195 {
 196         /*
 197          * Monitor mode implies promisc mode enabled.
 198          * In all other instances, check if we need to toggle promisc mode.
 199          */
 200         if (is_monitor_present(&rt2x00dev->interface) &&
 201             !test_bit(INTERFACE_ENABLED_PROMISC, &rt2x00dev->flags)) {
 202                 rt2x00dev->ops->lib->config_promisc(rt2x00dev, 1);
 203                 __set_bit(INTERFACE_ENABLED_PROMISC, &rt2x00dev->flags);
 204         }
 205
 206         if (test_bit(INTERFACE_ENABLED_PROMISC, &rt2x00dev->flags) != promisc) {
 207                 rt2x00dev->ops->lib->config_promisc(rt2x00dev, promisc);
 208                 __change_bit(INTERFACE_ENABLED_PROMISC, &rt2x00dev->flags);
 209         }
 210 }
 211
 212 void rt2x00lib_config_txpower(struct rt2x00_dev *rt2x00dev, const int txpower)
 213 {
 214         if (txpower == rt2x00dev->tx_power)
 215                 return;
 216
 217         rt2x00dev->ops->lib->config_txpower(rt2x00dev, txpower);
 218
 219         rt2x00dev->tx_power = txpower;
 220 }
 221
 222 void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
 223         const int antenna_tx, const int antenna_rx)
 224 {
 225         if (rt2x00dev->rx_status.antenna == antenna_rx)
 226                 return;
 227
 228         rt2x00dev->ops->lib->config_antenna(rt2x00dev, antenna_tx, antenna_rx);
 229
 230         rt2x00dev->rx_status.antenna = antenna_rx;
 231 }
 232
 233 /*
 234  * Driver initialization handlers.
 235  */
 236 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 237         const int channel, const int tx_power, const int value)
 238 {
 239         entry->chan = channel;
 240         if (channel <= 14)
 241                 entry->freq = 2407 + (5 * channel);
 242         else
 243                 entry->freq = 5000 + (5 * channel);
 244         entry->val = value;
 245         entry->flag =
 246                 IEEE80211_CHAN_W_IBSS |
 247                 IEEE80211_CHAN_W_ACTIVE_SCAN |
 248                 IEEE80211_CHAN_W_SCAN;
 249         entry->power_level = tx_power;
 250         entry->antenna_max = 0xff;
 251 }
 252
 253 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 254         const int rate,const int mask, const int plcp, const int flags)
 255 {
 256         entry->rate = rate;
 257         entry->val =
 258                 DEVICE_SET_RATE_FIELD(rate, RATE) |
 259                 DEVICE_SET_RATE_FIELD(mask, RATEMASK) |
 260                 DEVICE_SET_RATE_FIELD(plcp, PLCP);
 261         entry->flags = flags;
 262         entry->val2 = entry->val;
 263         if (entry->flags & IEEE80211_RATE_PREAMBLE2)
 264                 entry->val2 |= DEVICE_SET_RATE_FIELD(1, PREAMBLE);
 265         entry->min_rssi_ack = 0;
 266         entry->min_rssi_ack_delta = 0;
 267 }
 268
 269 static int rt2x00lib_init_hw_modes(struct rt2x00_dev *rt2x00dev,
 270         struct hw_mode_spec *spec)
 271 {
 272         struct ieee80211_hw *hw = rt2x00dev->hw;
 273         struct ieee80211_hw_mode *hwmodes;
 274         struct ieee80211_channel *channels;
 275         struct ieee80211_rate *rates;
 276         unsigned int i;
 277         unsigned char tx_power;
 278
 279         hwmodes = kzalloc(sizeof(*hwmodes) * spec->num_modes, GFP_KERNEL);
 280         if (!hwmodes)
 281                 goto exit;
 282
 283         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 284         if (!channels)
 285                 goto exit_free_modes;
 286
 287         rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
 288         if (!rates)
 289                 goto exit_free_channels;
 290
 291         /*
 292          * Initialize Rate list.
 293          */
 294         rt2x00lib_rate(&rates[0], 10, 0x001, 0x00, IEEE80211_RATE_CCK);
 295         rt2x00lib_rate(&rates[1], 20, 0x003, 0x01, IEEE80211_RATE_CCK_2);
 296         rt2x00lib_rate(&rates[2], 55, 0x007, 0x02, IEEE80211_RATE_CCK_2);
 297         rt2x00lib_rate(&rates[3], 110, 0x00f, 0x03, IEEE80211_RATE_CCK_2);
 298
 299         if (spec->num_rates > 4) {
 300                 rt2x00lib_rate(&rates[4], 60, 0x01f, 0x0b, IEEE80211_RATE_OFDM);
 301                 rt2x00lib_rate(&rates[5], 90, 0x03f, 0x0f, IEEE80211_RATE_OFDM);
 302                 rt2x00lib_rate(&rates[6], 120, 0x07f, 0x0a, IEEE80211_RATE_OFDM);
 303                 rt2x00lib_rate(&rates[7], 180, 0x0ff, 0x0e, IEEE80211_RATE_OFDM);
 304                 rt2x00lib_rate(&rates[8], 240, 0x1ff, 0x09, IEEE80211_RATE_OFDM);
 305                 rt2x00lib_rate(&rates[9], 360, 0x3ff, 0x0d, IEEE80211_RATE_OFDM);
 306                 rt2x00lib_rate(&rates[10], 480, 0x7ff, 0x08, IEEE80211_RATE_OFDM);
 307                 rt2x00lib_rate(&rates[11], 540, 0xfff, 0x0c, IEEE80211_RATE_OFDM);
 308         }
 309
 310         /*
 311          * Initialize Channel list.
 312          */
 313         for (i = 0; i < 14; i++)
 314                 rt2x00lib_channel(&channels[i], i + 1,
 315                         spec->tx_power_bg[i], spec->chan_val_bg[i]);
 316
 317         if (spec->num_channels > 14) {
 318                 for (i = 14; i < spec->num_channels; i++) {
 319                         if (i < 22)
 320                                 channels[i].chan = 36;
 321                         else if (i < 33)
 322                                 channels[i].chan = 100;
 323                         else
 324                                 channels[i].chan = 149;
 325                         channels[i].chan += ((i - 14) * 4);
 326
 327                         if (spec->tx_power_a)
 328                                 tx_power = spec->tx_power_a[i];
 329                         else
 330                                 tx_power = spec->tx_power_default;
 331
 332                         rt2x00lib_channel(&channels[i],
 333                                 channels[i].chan, tx_power,
 334                                 spec->chan_val_a[i]);
 335                 }
 336         }
 337
 338         /*
 339          * Intitialize 802.11b
 340          * Rates: CCK.
 341          * Channels: OFDM.
 342          */
 343         if (spec->num_modes > HWMODE_B) {
 344                 hwmodes[HWMODE_B].mode = MODE_IEEE80211B;
 345                 hwmodes[HWMODE_B].num_channels = 14;
 346                 hwmodes[HWMODE_B].num_rates = 4;
 347                 hwmodes[HWMODE_B].channels = channels;
 348                 hwmodes[HWMODE_B].rates = rates;
 349         }
 350
 351         /*
 352          * Intitialize 802.11g
 353          * Rates: CCK, OFDM.
 354          * Channels: OFDM.
 355          */
 356         if (spec->num_modes > HWMODE_G) {
 357                 hwmodes[HWMODE_G].mode = MODE_IEEE80211G;
 358                 hwmodes[HWMODE_G].num_channels = 14;
 359                 hwmodes[HWMODE_G].num_rates = spec->num_rates;
 360                 hwmodes[HWMODE_G].channels = channels;
 361                 hwmodes[HWMODE_G].rates = rates;
 362         }
 363
 364         /*
 365          * Intitialize 802.11a
 366          * Rates: OFDM.
 367          * Channels: OFDM, UNII, HiperLAN2.
 368          */
 369         if (spec->num_modes > HWMODE_A) {
 370                 hwmodes[HWMODE_A].mode = MODE_IEEE80211A;
 371                 hwmodes[HWMODE_A].num_channels = spec->num_channels - 14;
 372                 hwmodes[HWMODE_A].num_rates = spec->num_rates - 4;
 373                 hwmodes[HWMODE_A].channels = &channels[14];
 374                 hwmodes[HWMODE_A].rates = &rates[4];
 375         }
 376
 377         if (spec->num_modes > HWMODE_G &&
 378             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_G]))
 379                 goto exit_free_rates;
 380
 381         if (spec->num_modes > HWMODE_B &&
 382             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_B]))
 383                 goto exit_free_rates;
 384
 385         if (spec->num_modes > HWMODE_A &&
 386             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_A]))
 387                 goto exit_free_rates;
 388
 389         rt2x00dev->hwmodes = hwmodes;
 390
 391         return 0;
 392
 393 exit_free_rates:
 394         kfree(rates);
 395
 396 exit_free_channels:
 397         kfree(channels);
 398
 399 exit_free_modes:
 400         kfree(hwmodes);
 401
 402 exit:
 403         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 404         return -ENOMEM;
 405 }
 406
 407 static void rt2x00lib_deinit_hw(struct rt2x00_dev *rt2x00dev)
 408 {
 409         if (test_bit(DEVICE_INITIALIZED_HW, &rt2x00dev->flags))
 410                 ieee80211_unregister_hw(rt2x00dev->hw);
 411
 412         if (likely(rt2x00dev->hwmodes)) {
 413                 kfree(rt2x00dev->hwmodes->channels);
 414                 kfree(rt2x00dev->hwmodes->rates);
 415                 kfree(rt2x00dev->hwmodes);
 416                 rt2x00dev->hwmodes = NULL;
 417         }
 418 }
 419
 420 static int rt2x00lib_init_hw(struct rt2x00_dev *rt2x00dev)
 421 {
 422         struct hw_mode_spec *spec = &rt2x00dev->spec;
 423         int status;
 424
 425         /*
 426          * Initialize device.
 427          */
 428         SET_IEEE80211_DEV(rt2x00dev->hw, rt2x00dev->device);
 429
 430         /*
 431          * Initialize MAC address.
 432          */
 433         if (!is_valid_ether_addr(spec->mac_addr)) {
 434                 ERROR(rt2x00dev, "Invalid MAC addr: " MAC_FMT ".\n",
 435                         MAC_ARG(spec->mac_addr));
 436                 return -EINVAL;
 437         }
 438
 439         rt2x00dev->ops->lib->config_mac_addr(rt2x00dev, spec->mac_addr);
 440         SET_IEEE80211_PERM_ADDR(rt2x00dev->hw, spec->mac_addr);
 441
 442         /*
 443          * Initialize HW modes.
 444          */
 445         status = rt2x00lib_init_hw_modes(rt2x00dev, spec);
 446         if (status)
 447                 return status;
 448
 449         /*
 450          * Register HW.
 451          */
 452         status = ieee80211_register_hw(rt2x00dev->hw);
 453         if (status) {
 454                 rt2x00lib_deinit_hw(rt2x00dev);
 455                 return status;
 456         }
 457
 458         __set_bit(DEVICE_INITIALIZED_HW, &rt2x00dev->flags);
 459
 460         return 0;
 461 }
 462
 463 /*
 464  * Initialization/uninitialization handlers.
 465  */
 466 static int rt2x00lib_alloc_ring(struct data_ring *ring,
 467         const u16 max_entries, const u16 data_size, const u16 desc_size)
 468 {
 469         struct data_entry *entry;
 470         unsigned int i;
 471
 472         ring->stats.limit = max_entries;
 473         ring->data_size = data_size;
 474         ring->desc_size = desc_size;
 475
 476         /*
 477          * Allocate all ring entries.
 478          */
 479         entry = kzalloc(ring->stats.limit * sizeof(*entry), GFP_KERNEL);
 480         if (!entry)
 481                 return -ENOMEM;
 482
 483         for (i = 0; i < ring->stats.limit; i++) {
 484                 entry[i].flags = 0;
 485                 entry[i].ring = ring;
 486                 entry[i].skb = NULL;
 487         }
 488
 489         ring->entry = entry;
 490
 491         return 0;
 492 }
 493
 494 static int rt2x00lib_allocate_rings(struct rt2x00_dev *rt2x00dev)
 495 {
 496         struct data_ring *ring;
 497
 498         /*
 499          * Allocate the RX ring.
 500          */
 501         if (rt2x00lib_alloc_ring(rt2x00dev->rx,
 502                 RX_ENTRIES, DATA_FRAME_SIZE, rt2x00dev->ops->rxd_size))
 503                 return -ENOMEM;
 504
 505         /*
 506          * First allocate the TX rings.
 507          */
 508         txring_for_each(rt2x00dev, ring) {
 509                 if (rt2x00lib_alloc_ring(ring,
 510                         TX_ENTRIES, DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
 511                         return -ENOMEM;
 512         }
 513
 514         /*
 515          * Allocate the BEACON ring.
 516          */
 517         if (rt2x00lib_alloc_ring(&rt2x00dev->bcn[0],
 518                 BEACON_ENTRIES, MGMT_FRAME_SIZE, rt2x00dev->ops->txd_size))
 519                 return -ENOMEM;
 520
 521         /*
 522          * Allocate the Atim ring.
 523          */
 524         if (test_bit(DEVICE_SUPPORT_ATIM, &rt2x00dev->flags)) {
 525                 if (rt2x00lib_alloc_ring(&rt2x00dev->bcn[1],
 526                         ATIM_ENTRIES, DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
 527                         return -ENOMEM;
 528         }
 529
 530         return 0;
 531 }
 532
 533 static void rt2x00lib_free_rings(struct rt2x00_dev *rt2x00dev)
 534 {
 535         struct data_ring *ring;
 536
 537         ring_for_each(rt2x00dev, ring) {
 538                 kfree(ring->entry);
 539                 ring->entry = NULL;
 540         }
 541 }
 542
 543 int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 544 {
 545         int status;
 546
 547         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 548                 return 0;
 549
 550         /*
 551          * Allocate all data rings.
 552          */
 553         status = rt2x00lib_allocate_rings(rt2x00dev);
 554         if (status) {
 555                 ERROR(rt2x00dev, "DMA allocation failed.\n");
 556                 return status;
 557         }
 558
 559         /*
 560          * Initialize the device.
 561          */
 562         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 563         if (status)
 564                 goto exit;
 565
 566         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
 567
 568         /*
 569          * Register the rfkill handler.
 570          */
 571         status = rt2x00lib_register_rfkill(rt2x00dev);
 572         if (status)
 573                 goto exit_unitialize;
 574
 575         return 0;
 576
 577 exit_unitialize:
 578         rt2x00lib_uninitialize(rt2x00dev);
 579
 580 exit:
 581         rt2x00lib_free_rings(rt2x00dev);
 582
 583         return status;
 584 }
 585
 586 void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 587 {
 588         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 589                 return;
 590
 591         /*
 592          * Flush out all pending work.
 593          */
 594         flush_workqueue(rt2x00dev->workqueue);
 595
 596         /*
 597          * Unregister rfkill.
 598          */
 599         rt2x00lib_unregister_rfkill(rt2x00dev);
 600
 601         /*
 602          * Allow the HW to uninitialize.
 603          */
 604         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 605
 606         /*
 607          * Free allocated datarings.
 608          */
 609         rt2x00lib_free_rings(rt2x00dev);
 610 }
 611
 612 /*
 613  * driver allocation handlers.
 614  */
 615 static int rt2x00lib_alloc_rings(struct rt2x00_dev *rt2x00dev)
 616 {
 617         struct data_ring *ring;
 618         unsigned int ring_num;
 619
 620         /*
 621          * We need the following rings:
 622          * RX: 1
 623          * TX: hw->queues
 624          * Beacon: 1
 625          * Atim: 1 (if supported)
 626          */
 627         ring_num = 2 + rt2x00dev->hw->queues +
 628                 test_bit(DEVICE_SUPPORT_ATIM, &rt2x00dev->flags);
 629
 630         ring = kzalloc(sizeof(*ring) * ring_num, GFP_KERNEL);
 631         if (!ring) {
 632                 ERROR(rt2x00dev, "Ring allocation failed.\n");
 633                 return -ENOMEM;
 634         }
 635
 636         /*
 637          * Initialize pointers
 638          */
 639         rt2x00dev->rx = &ring[0];
 640         rt2x00dev->tx = &ring[1];
 641         rt2x00dev->bcn = &ring[1 + rt2x00dev->hw->queues];
 642
 643         /*
 644          * Initialize ring parameters.
 645          * cw_min: 2^5 = 32.
 646          * cw_max: 2^10 = 1024.
 647          */
 648         ring_for_each(rt2x00dev, ring) {
 649                 ring->rt2x00dev = rt2x00dev;
 650                 ring->tx_params.aifs = 2;
 651                 ring->tx_params.cw_min = 5;
 652                 ring->tx_params.cw_max = 10;
 653         }
 654
 655         return 0;
 656 }
 657
 658 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 659 {
 660         int retval = -ENOMEM;
 661
 662         /*
 663          * Create workqueue.
 664          */
 665         rt2x00dev->workqueue = create_singlethread_workqueue(DRV_NAME);
 666         if (!rt2x00dev->workqueue)
 667                 goto exit;
 668
 669         /*
 670          * Let the driver probe the device to detect the capabilities.
 671          */
 672         retval = rt2x00dev->ops->lib->init_hw(rt2x00dev);
 673         if (retval) {
 674                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 675                 goto exit;
 676         }
 677
 678         /*
 679          * Initialize configuration work.
 680          */
 681         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
 682
 683         /*
 684          * Reset current working type.
 685          */
 686         rt2x00dev->interface.type = -EINVAL;
 687
 688         /*
 689          * Allocate ring array.
 690          */
 691         retval = rt2x00lib_alloc_rings(rt2x00dev);
 692         if (retval)
 693                 goto exit;
 694
 695         /*
 696          * Initialize ieee80211 structure.
 697          */
 698         retval = rt2x00lib_init_hw(rt2x00dev);
 699         if (retval) {
 700                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
 701                 goto exit;
 702         }
 703
 704         /*
 705          * Allocatie rfkill.
 706          */
 707         retval = rt2x00lib_allocate_rfkill(rt2x00dev);
 708         if (retval)
 709                 goto exit;
 710
 711         /*
 712          * Open the debugfs entry.
 713          */
 714         rt2x00debug_register(rt2x00dev);
 715
 716         /*
 717          * Check if we need to load the firmware.
 718          */
 719         if (test_bit(FIRMWARE_REQUIRED, &rt2x00dev->flags)) {
 720                 /*
 721                  * Request firmware and wait with further
 722                  * initializing of the card until the firmware
 723                  * has been loaded.
 724                  */
 725                 retval = rt2x00lib_load_firmware(rt2x00dev);
 726                 if (retval)
 727                         goto exit;
 728         }
 729
 730         return 0;
 731
 732 exit:
 733         rt2x00lib_remove_dev(rt2x00dev);
 734
 735         return retval;
 736 }
 737 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
 738
 739 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
 740 {
 741         /*
 742          * Disable radio.
 743          */
 744         rt2x00lib_disable_radio(rt2x00dev);
 745
 746         /*
 747          * Uninitialize device.
 748          */
 749         rt2x00lib_uninitialize(rt2x00dev);
 750
 751         /*
 752          * Close debugfs entry.
 753          */
 754         rt2x00debug_deregister(rt2x00dev);
 755
 756         /*
 757          * Free rfkill
 758          */
 759         rt2x00lib_free_rfkill(rt2x00dev);
 760
 761         /*
 762          * Free ieee80211_hw memory.
 763          */
 764         rt2x00lib_deinit_hw(rt2x00dev);
 765
 766         /*
 767          * Free workqueue.
 768          */
 769         if (likely(rt2x00dev->workqueue)) {
 770                 destroy_workqueue(rt2x00dev->workqueue);
 771                 rt2x00dev->workqueue = NULL;
 772         }
 773
 774         /*
 775          * Free ring structures.
 776          */
 777         kfree(rt2x00dev->rx);
 778         rt2x00dev->rx = NULL;
 779         rt2x00dev->tx = NULL;
 780         rt2x00dev->bcn = NULL;
 781
 782         /*
 783          * Free EEPROM memory.
 784          */
 785         kfree(rt2x00dev->eeprom);
 786         rt2x00dev->eeprom = NULL;
 787 }
 788 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
 789
 790 /*
 791  * Device state handlers
 792  */
 793 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev,
 794         pm_message_t state)
 795 {
 796         int retval;
 797
 798         NOTICE(rt2x00dev, "Going to sleep.\n");
 799
 800         rt2x00lib_disable_radio(rt2x00dev);
 801
 802         /*
 803          * Set device mode to sleep for power management.
 804          */
 805         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
 806         if (retval)
 807                 return retval;
 808
 809         rt2x00lib_remove_dev(rt2x00dev);
 810
 811         return 0;
 812 }
 813 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
 814
 815 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
 816 {
 817         int retval;
 818
 819         NOTICE(rt2x00dev, "Waking up.\n");
 820
 821         retval = rt2x00lib_probe_dev(rt2x00dev);
 822         if (retval) {
 823                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 824                 return retval;
 825         }
 826
 827         /*
 828          * Set device mode to awake for power management.
 829          */
 830         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE);
 831         if (retval)
 832                 return retval;
 833
 834         return 0;
 835 }
 836 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
 837
 838 /*
 839  * Interrupt context handlers.
 840  */
 841 void rt2x00lib_txdone(struct data_entry *entry,
 842         const int status, const int retry)
 843 {
 844         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 845         struct ieee80211_tx_status *tx_status = &entry->tx_status;
 846         struct ieee80211_low_level_stats *stats = &rt2x00dev->low_level_stats;
 847
 848         /*
 849          * Update TX statistics.
 850          */
 851         tx_status->flags = 0;
 852         tx_status->ack_signal = 0;
 853         tx_status->excessive_retries = (status == TX_FAIL_RETRY);
 854         tx_status->retry_count = retry;
 855
 856         if (!(tx_status->control.flags & IEEE80211_TXCTL_NO_ACK)) {
 857                 if (status == TX_SUCCESS || status == TX_SUCCESS_RETRY)
 858                         tx_status->flags |= IEEE80211_TX_STATUS_ACK;
 859                 else
 860                         stats->dot11ACKFailureCount++;
 861         }
 862
 863         tx_status->queue_length = entry->ring->stats.limit;
 864         tx_status->queue_number = tx_status->control.queue;
 865
 866         if (tx_status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) {
 867                 if (status == TX_SUCCESS || status == TX_SUCCESS_RETRY)
 868                         stats->dot11RTSSuccessCount++;
 869                 else
 870                         stats->dot11RTSFailureCount++;
 871         }
 872
 873         /*
 874          * Send the tx_status to mac80211,
 875          * that method also cleans up the skb structure.
 876          */
 877         ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb, tx_status);
 878
 879         entry->skb = NULL;
 880 }
 881 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 882
 883 void rt2x00lib_rxdone(struct data_entry *entry, char *data,
 884         const int size, const int signal, const int rssi, const int ofdm)
 885 {
 886         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 887         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 888         struct ieee80211_hw_mode *mode;
 889         struct ieee80211_rate *rate;
 890         struct sk_buff *skb;
 891         unsigned int i;
 892         int val = 0;
 893
 894         /*
 895          * Update RX statistics.
 896          */
 897         mode = &rt2x00dev->hwmodes[rt2x00dev->curr_hwmode];
 898         for (i = 0; i < mode->num_rates; i++) {
 899                 rate = &mode->rates[i];
 900
 901                 /*
 902                  * When frame was received with an OFDM bitrate,
 903                  * the signal is the PLCP value. If it was received with
 904                  * a CCK bitrate the signal is the rate in 0.5kbit/s.
 905                  */
 906                 if (!ofdm)
 907                         val = DEVICE_GET_RATE_FIELD(rate->val, RATE);
 908                 else
 909                         val = DEVICE_GET_RATE_FIELD(rate->val, PLCP);
 910
 911                 if (val == signal) {
 912                         /*
 913                          * Check for preamble bit.
 914                          */
 915                         if (signal & 0x08)
 916                                 val = rate->val2;
 917                         val = rate->val;
 918                         break;
 919                 }
 920         }
 921
 922         rx_status->rate = val;
 923         rx_status->ssi = rssi;
 924         rx_status->noise = rt2x00dev->link.curr_noise;
 925         rt2x00_update_link_rssi(&rt2x00dev->link, rssi);
 926
 927         /*
 928          * Let's allocate a sk_buff where we can store the received data in,
 929          * note that if data is NULL, we still have to allocate a sk_buff
 930          * but that we should use that to replace the sk_buff which is already
 931          * inside the entry.
 932          */
 933         skb = dev_alloc_skb(size + NET_IP_ALIGN);
 934         if (!skb)
 935                 return;
 936
 937         skb_reserve(skb, NET_IP_ALIGN);
 938         skb_put(skb, size);
 939
 940         if (data) {
 941                 memcpy(skb->data, data, size);
 942                 entry->skb = skb;
 943                 skb = NULL;
 944         }
 945
 946         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 947         entry->skb = skb;
 948 }
 949 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 950
 951 /*
 952  * TX descriptor initializer
 953  */
 954 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 955         struct data_entry *entry, struct data_desc *txd,
 956         struct ieee80211_hdr *ieee80211hdr, unsigned int length,
 957         struct ieee80211_tx_control *control)
 958 {
 959         struct data_entry_desc desc;
 960         int tx_rate;
 961         int bitrate;
 962         int duration;
 963         int residual;
 964         u16 frame_control;
 965         u16 seq_ctrl;
 966
 967         /*
 968          * Identify queue
 969          */
 970         if (control->queue < rt2x00dev->hw->queues)
 971                 desc.queue = control->queue;
 972         else
 973                 desc.queue = 15;
 974
 975         /*
 976          * Read required fields from ieee80211 header.
 977          */
 978         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 979         seq_ctrl = le16_to_cpu(ieee80211hdr->seq_ctrl);
 980
 981         tx_rate = control->tx_rate;
 982
 983         /*
 984          * Check if this is a rts frame
 985          */
 986         if (is_rts_frame(frame_control)) {
 987                 __set_bit(ENTRY_TXD_RTS_FRAME, &entry->flags);
 988                 if (control->rts_cts_rate)
 989                         tx_rate = control->rts_cts_rate;
 990         }
 991
 992         /*
 993          * Check for OFDM
 994          */
 995         if (DEVICE_GET_RATE_FIELD(tx_rate, RATEMASK) & DEV_OFDM_RATE)
 996                 __set_bit(ENTRY_TXD_OFDM_RATE, &entry->flags);
 997
 998         /*
 999          * Check if more fragments are pending
1000          */
1001         if (ieee80211_get_morefrag(ieee80211hdr))
1002                 __set_bit(ENTRY_TXD_MORE_FRAG, &entry->flags);
1003
1004         /*
1005          * Check if this is a new sequence
1006          */
1007         if ((seq_ctrl & IEEE80211_SCTL_FRAG) == 0)
1008                 __set_bit(ENTRY_TXD_NEW_SEQ, &entry->flags);
1009
1010         /*
1011          * Beacons and probe responses require the tsf timestamp
1012          * to be inserted into the frame.
1013          */
1014         if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
1015             is_probe_resp(frame_control))
1016                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &entry->flags);
1017
1018         /*
1019          * Check if ACK is required
1020          */
1021         if (!(control->flags & IEEE80211_TXCTL_NO_ACK))
1022                 __set_bit(ENTRY_TXD_REQ_ACK, &entry->flags);
1023
1024         /*
1025          * Determine with what IFS priority this frame should be send.
1026          * Set ifs to IFS_SIFS when the this is not the first fragment,
1027          * or this fragment came after RTS/CTS.
1028          */
1029         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
1030             test_bit(ENTRY_TXD_RTS_FRAME, &entry->flags))
1031                 desc.ifs = IFS_SIFS;
1032         else
1033                 desc.ifs = IFS_BACKOFF;
1034
1035         /*
1036          * How the length should be processed depends
1037          * on if we are working with OFDM rates or not.
1038          */
1039         if (test_bit(ENTRY_TXD_OFDM_RATE, &entry->flags)) {
1040                 residual = 0;
1041                 desc.length_high = ((length + FCS_LEN) >> 6) & 0x3f;
1042                 desc.length_low = ((length + FCS_LEN) & 0x3f);
1043
1044         } else {
1045                 bitrate = DEVICE_GET_RATE_FIELD(tx_rate, RATE);
1046
1047                 /*
1048                  * Convert length to microseconds.
1049                  */
1050                 residual = get_duration_res(length + FCS_LEN, bitrate);
1051                 duration = get_duration(length + FCS_LEN, bitrate);
1052
1053                 if (residual != 0)
1054                         duration++;
1055
1056                 desc.length_high = duration >> 8;
1057                 desc.length_low = duration & 0xff;
1058         }
1059
1060         /*
1061          * Create the signal and service values.
1062          */
1063         desc.signal = DEVICE_GET_RATE_FIELD(tx_rate, PLCP);
1064         if (DEVICE_GET_RATE_FIELD(tx_rate, PREAMBLE))
1065                 desc.signal |= 0x08;
1066
1067         desc.service = 0x04;
1068         if (residual <= (8 % 11))
1069                 desc.service |= 0x80;
1070
1071         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, entry, txd, &desc,
1072                 ieee80211hdr, length, control);
1073 }
1074 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
1075
1076 /*
1077  * rt2x00lib module information.
1078  */
1079 MODULE_AUTHOR(DRV_PROJECT);
1080 MODULE_VERSION(DRV_VERSION);
1081 MODULE_DESCRIPTION("rt2x00 library");
1082 MODULE_LICENSE("GPL");