drivers/net/wireless/ath/ath9k/htc_drv_gpio.c

   1 /*
   2  * Copyright (c) 2010 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "htc.h"
  18
  19 /******************/
  20 /*     BTCOEX     */
  21 /******************/
  22
  23 /*
  24  * Detects if there is any priority bt traffic
  25  */
  26 static void ath_detect_bt_priority(struct ath9k_htc_priv *priv)
  27 {
  28         struct ath_btcoex *btcoex = &priv->btcoex;
  29         struct ath_hw *ah = priv->ah;
  30
  31         if (ath9k_hw_gpio_get(ah, ah->btcoex_hw.btpriority_gpio))
  32                 btcoex->bt_priority_cnt++;
  33
  34         if (time_after(jiffies, btcoex->bt_priority_time +
  35                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
  36                 priv->op_flags &= ~(OP_BT_PRIORITY_DETECTED | OP_BT_SCAN);
  37                 /* Detect if colocated bt started scanning */
  38                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
  39                         ath_dbg(ath9k_hw_common(ah), ATH_DBG_BTCOEX,
  40                                 "BT scan detected\n");
  41                         priv->op_flags |= (OP_BT_SCAN |
  42                                          OP_BT_PRIORITY_DETECTED);
  43                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
  44                         ath_dbg(ath9k_hw_common(ah), ATH_DBG_BTCOEX,
  45                                 "BT priority traffic detected\n");
  46                         priv->op_flags |= OP_BT_PRIORITY_DETECTED;
  47                 }
  48
  49                 btcoex->bt_priority_cnt = 0;
  50                 btcoex->bt_priority_time = jiffies;
  51         }
  52 }
  53
  54 /*
  55  * This is the master bt coex work which runs for every
  56  * 45ms, bt traffic will be given priority during 55% of this
  57  * period while wlan gets remaining 45%
  58  */
  59 static void ath_btcoex_period_work(struct work_struct *work)
  60 {
  61         struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
  62                                                    coex_period_work.work);
  63         struct ath_btcoex *btcoex = &priv->btcoex;
  64         struct ath_common *common = ath9k_hw_common(priv->ah);
  65         u32 timer_period;
  66         bool is_btscan;
  67         int ret;
  68         u8 cmd_rsp, aggr;
  69
  70         ath_detect_bt_priority(priv);
  71
  72         is_btscan = !!(priv->op_flags & OP_BT_SCAN);
  73
  74         aggr = priv->op_flags & OP_BT_PRIORITY_DETECTED;
  75
  76         WMI_CMD_BUF(WMI_AGGR_LIMIT_CMD, &aggr);
  77
  78         ath9k_cmn_btcoex_bt_stomp(common, is_btscan ? ATH_BTCOEX_STOMP_ALL :
  79                         btcoex->bt_stomp_type);
  80
  81         timer_period = is_btscan ? btcoex->btscan_no_stomp :
  82                 btcoex->btcoex_no_stomp;
  83         ieee80211_queue_delayed_work(priv->hw, &priv->duty_cycle_work,
  84                                      msecs_to_jiffies(timer_period));
  85         ieee80211_queue_delayed_work(priv->hw, &priv->coex_period_work,
  86                                      msecs_to_jiffies(btcoex->btcoex_period));
  87 }
  88
  89 /*
  90  * Work to time slice between wlan and bt traffic and
  91  * configure weight registers
  92  */
  93 static void ath_btcoex_duty_cycle_work(struct work_struct *work)
  94 {
  95         struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
  96                                                    duty_cycle_work.work);
  97         struct ath_hw *ah = priv->ah;
  98         struct ath_btcoex *btcoex = &priv->btcoex;
  99         struct ath_common *common = ath9k_hw_common(ah);
 100         bool is_btscan = priv->op_flags & OP_BT_SCAN;
 101
 102         ath_dbg(common, ATH_DBG_BTCOEX,
 103                 "time slice work for bt and wlan\n");
 104
 105         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW || is_btscan)
 106                 ath9k_cmn_btcoex_bt_stomp(common, ATH_BTCOEX_STOMP_NONE);
 107         else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 108                 ath9k_cmn_btcoex_bt_stomp(common, ATH_BTCOEX_STOMP_LOW);
 109 }
 110
 111 void ath_htc_init_btcoex_work(struct ath9k_htc_priv *priv)
 112 {
 113         struct ath_btcoex *btcoex = &priv->btcoex;
 114
 115         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD;
 116         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 117                 btcoex->btcoex_period / 100;
 118         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
 119                                    btcoex->btcoex_period / 100;
 120         INIT_DELAYED_WORK(&priv->coex_period_work, ath_btcoex_period_work);
 121         INIT_DELAYED_WORK(&priv->duty_cycle_work, ath_btcoex_duty_cycle_work);
 122 }
 123
 124 /*
 125  * (Re)start btcoex work
 126  */
 127
 128 void ath_htc_resume_btcoex_work(struct ath9k_htc_priv *priv)
 129 {
 130         struct ath_btcoex *btcoex = &priv->btcoex;
 131         struct ath_hw *ah = priv->ah;
 132
 133         ath_dbg(ath9k_hw_common(ah), ATH_DBG_BTCOEX, "Starting btcoex work\n");
 134
 135         btcoex->bt_priority_cnt = 0;
 136         btcoex->bt_priority_time = jiffies;
 137         priv->op_flags &= ~(OP_BT_PRIORITY_DETECTED | OP_BT_SCAN);
 138         ieee80211_queue_delayed_work(priv->hw, &priv->coex_period_work, 0);
 139 }
 140
 141
 142 /*
 143  * Cancel btcoex and bt duty cycle work.
 144  */
 145 void ath_htc_cancel_btcoex_work(struct ath9k_htc_priv *priv)
 146 {
 147         cancel_delayed_work_sync(&priv->coex_period_work);
 148         cancel_delayed_work_sync(&priv->duty_cycle_work);
 149 }
 150
 151 /*******/
 152 /* LED */
 153 /*******/
 154
 155 static void ath9k_led_blink_work(struct work_struct *work)
 156 {
 157         struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
 158                                                    ath9k_led_blink_work.work);
 159
 160         if (!(priv->op_flags & OP_LED_ASSOCIATED))
 161                 return;
 162
 163         if ((priv->led_on_duration == ATH_LED_ON_DURATION_IDLE) ||
 164             (priv->led_off_duration == ATH_LED_OFF_DURATION_IDLE))
 165                 ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin, 0);
 166         else
 167                 ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin,
 168                                   (priv->op_flags & OP_LED_ON) ? 1 : 0);
 169
 170         ieee80211_queue_delayed_work(priv->hw,
 171                                      &priv->ath9k_led_blink_work,
 172                                      (priv->op_flags & OP_LED_ON) ?
 173                                      msecs_to_jiffies(priv->led_off_duration) :
 174                                      msecs_to_jiffies(priv->led_on_duration));
 175
 176         priv->led_on_duration = priv->led_on_cnt ?
 177                 max((ATH_LED_ON_DURATION_IDLE - priv->led_on_cnt), 25) :
 178                 ATH_LED_ON_DURATION_IDLE;
 179         priv->led_off_duration = priv->led_off_cnt ?
 180                 max((ATH_LED_OFF_DURATION_IDLE - priv->led_off_cnt), 10) :
 181                 ATH_LED_OFF_DURATION_IDLE;
 182         priv->led_on_cnt = priv->led_off_cnt = 0;
 183
 184         if (priv->op_flags & OP_LED_ON)
 185                 priv->op_flags &= ~OP_LED_ON;
 186         else
 187                 priv->op_flags |= OP_LED_ON;
 188 }
 189
 190 static void ath9k_led_brightness_work(struct work_struct *work)
 191 {
 192         struct ath_led *led = container_of(work, struct ath_led,
 193                                            brightness_work.work);
 194         struct ath9k_htc_priv *priv = led->priv;
 195
 196         switch (led->brightness) {
 197         case LED_OFF:
 198                 if (led->led_type == ATH_LED_ASSOC ||
 199                     led->led_type == ATH_LED_RADIO) {
 200                         ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin,
 201                                           (led->led_type == ATH_LED_RADIO));
 202                         priv->op_flags &= ~OP_LED_ASSOCIATED;
 203                         if (led->led_type == ATH_LED_RADIO)
 204                                 priv->op_flags &= ~OP_LED_ON;
 205                 } else {
 206                         priv->led_off_cnt++;
 207                 }
 208                 break;
 209         case LED_FULL:
 210                 if (led->led_type == ATH_LED_ASSOC) {
 211                         priv->op_flags |= OP_LED_ASSOCIATED;
 212                         ieee80211_queue_delayed_work(priv->hw,
 213                                              &priv->ath9k_led_blink_work, 0);
 214                 } else if (led->led_type == ATH_LED_RADIO) {
 215                         ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin, 0);
 216                         priv->op_flags |= OP_LED_ON;
 217                 } else {
 218                         priv->led_on_cnt++;
 219                 }
 220                 break;
 221         default:
 222                 break;
 223         }
 224 }
 225
 226 static void ath9k_led_brightness(struct led_classdev *led_cdev,
 227                                  enum led_brightness brightness)
 228 {
 229         struct ath_led *led = container_of(led_cdev, struct ath_led, led_cdev);
 230         struct ath9k_htc_priv *priv = led->priv;
 231
 232         led->brightness = brightness;
 233         if (!(priv->op_flags & OP_LED_DEINIT))
 234                 ieee80211_queue_delayed_work(priv->hw,
 235                                              &led->brightness_work, 0);
 236 }
 237
 238 void ath9k_led_stop_brightness(struct ath9k_htc_priv *priv)
 239 {
 240         cancel_delayed_work_sync(&priv->radio_led.brightness_work);
 241         cancel_delayed_work_sync(&priv->assoc_led.brightness_work);
 242         cancel_delayed_work_sync(&priv->tx_led.brightness_work);
 243         cancel_delayed_work_sync(&priv->rx_led.brightness_work);
 244 }
 245
 246 static int ath9k_register_led(struct ath9k_htc_priv *priv, struct ath_led *led,
 247                               char *trigger)
 248 {
 249         int ret;
 250
 251         led->priv = priv;
 252         led->led_cdev.name = led->name;
 253         led->led_cdev.default_trigger = trigger;
 254         led->led_cdev.brightness_set = ath9k_led_brightness;
 255
 256         ret = led_classdev_register(wiphy_dev(priv->hw->wiphy), &led->led_cdev);
 257         if (ret)
 258                 ath_err(ath9k_hw_common(priv->ah),
 259                         "Failed to register led:%s", led->name);
 260         else
 261                 led->registered = 1;
 262
 263         INIT_DELAYED_WORK(&led->brightness_work, ath9k_led_brightness_work);
 264
 265         return ret;
 266 }
 267
 268 static void ath9k_unregister_led(struct ath_led *led)
 269 {
 270         if (led->registered) {
 271                 led_classdev_unregister(&led->led_cdev);
 272                 led->registered = 0;
 273         }
 274 }
 275
 276 void ath9k_deinit_leds(struct ath9k_htc_priv *priv)
 277 {
 278         priv->op_flags |= OP_LED_DEINIT;
 279         ath9k_unregister_led(&priv->assoc_led);
 280         priv->op_flags &= ~OP_LED_ASSOCIATED;
 281         ath9k_unregister_led(&priv->tx_led);
 282         ath9k_unregister_led(&priv->rx_led);
 283         ath9k_unregister_led(&priv->radio_led);
 284 }
 285
 286 void ath9k_init_leds(struct ath9k_htc_priv *priv)
 287 {
 288         char *trigger;
 289         int ret;
 290
 291         if (AR_SREV_9287(priv->ah))
 292                 priv->ah->led_pin = ATH_LED_PIN_9287;
 293         else if (AR_SREV_9271(priv->ah))
 294                 priv->ah->led_pin = ATH_LED_PIN_9271;
 295         else if (AR_DEVID_7010(priv->ah))
 296                 priv->ah->led_pin = ATH_LED_PIN_7010;
 297         else
 298                 priv->ah->led_pin = ATH_LED_PIN_DEF;
 299
 300         /* Configure gpio 1 for output */
 301         ath9k_hw_cfg_output(priv->ah, priv->ah->led_pin,
 302                             AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 303         /* LED off, active low */
 304         ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin, 1);
 305
 306         INIT_DELAYED_WORK(&priv->ath9k_led_blink_work, ath9k_led_blink_work);
 307
 308         trigger = ieee80211_get_radio_led_name(priv->hw);
 309         snprintf(priv->radio_led.name, sizeof(priv->radio_led.name),
 310                 "ath9k-%s::radio", wiphy_name(priv->hw->wiphy));
 311         ret = ath9k_register_led(priv, &priv->radio_led, trigger);
 312         priv->radio_led.led_type = ATH_LED_RADIO;
 313         if (ret)
 314                 goto fail;
 315
 316         trigger = ieee80211_get_assoc_led_name(priv->hw);
 317         snprintf(priv->assoc_led.name, sizeof(priv->assoc_led.name),
 318                 "ath9k-%s::assoc", wiphy_name(priv->hw->wiphy));
 319         ret = ath9k_register_led(priv, &priv->assoc_led, trigger);
 320         priv->assoc_led.led_type = ATH_LED_ASSOC;
 321         if (ret)
 322                 goto fail;
 323
 324         trigger = ieee80211_get_tx_led_name(priv->hw);
 325         snprintf(priv->tx_led.name, sizeof(priv->tx_led.name),
 326                 "ath9k-%s::tx", wiphy_name(priv->hw->wiphy));
 327         ret = ath9k_register_led(priv, &priv->tx_led, trigger);
 328         priv->tx_led.led_type = ATH_LED_TX;
 329         if (ret)
 330                 goto fail;
 331
 332         trigger = ieee80211_get_rx_led_name(priv->hw);
 333         snprintf(priv->rx_led.name, sizeof(priv->rx_led.name),
 334                 "ath9k-%s::rx", wiphy_name(priv->hw->wiphy));
 335         ret = ath9k_register_led(priv, &priv->rx_led, trigger);
 336         priv->rx_led.led_type = ATH_LED_RX;
 337         if (ret)
 338                 goto fail;
 339
 340         priv->op_flags &= ~OP_LED_DEINIT;
 341
 342         return;
 343
 344 fail:
 345         cancel_delayed_work_sync(&priv->ath9k_led_blink_work);
 346         ath9k_deinit_leds(priv);
 347 }
 348
 349 /*******************/
 350 /*      Rfkill     */
 351 /*******************/
 352
 353 static bool ath_is_rfkill_set(struct ath9k_htc_priv *priv)
 354 {
 355         return ath9k_hw_gpio_get(priv->ah, priv->ah->rfkill_gpio) ==
 356                 priv->ah->rfkill_polarity;
 357 }
 358
 359 void ath9k_htc_rfkill_poll_state(struct ieee80211_hw *hw)
 360 {
 361         struct ath9k_htc_priv *priv = hw->priv;
 362         bool blocked = !!ath_is_rfkill_set(priv);
 363
 364         wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
 365 }
 366
 367 void ath9k_start_rfkill_poll(struct ath9k_htc_priv *priv)
 368 {
 369         if (priv->ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 370                 wiphy_rfkill_start_polling(priv->hw->wiphy);
 371 }
 372
 373 void ath9k_htc_radio_enable(struct ieee80211_hw *hw)
 374 {
 375         struct ath9k_htc_priv *priv = hw->priv;
 376         struct ath_hw *ah = priv->ah;
 377         struct ath_common *common = ath9k_hw_common(ah);
 378         int ret;
 379         u8 cmd_rsp;
 380
 381         if (!ah->curchan)
 382                 ah->curchan = ath9k_cmn_get_curchannel(hw, ah);
 383
 384         /* Reset the HW */
 385         ret = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
 386         if (ret) {
 387                 ath_err(common,
 388                         "Unable to reset hardware; reset status %d (freq %u MHz)\n",
 389                         ret, ah->curchan->channel);
 390         }
 391
 392         ath9k_cmn_update_txpow(ah, priv->curtxpow, priv->txpowlimit,
 393                                &priv->curtxpow);
 394
 395         /* Start RX */
 396         WMI_CMD(WMI_START_RECV_CMDID);
 397         ath9k_host_rx_init(priv);
 398
 399         /* Start TX */
 400         htc_start(priv->htc);
 401         spin_lock_bh(&priv->tx_lock);
 402         priv->tx_queues_stop = false;
 403         spin_unlock_bh(&priv->tx_lock);
 404         ieee80211_wake_queues(hw);
 405
 406         WMI_CMD(WMI_ENABLE_INTR_CMDID);
 407
 408         /* Enable LED */
 409         ath9k_hw_cfg_output(ah, ah->led_pin,
 410                             AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 411         ath9k_hw_set_gpio(ah, ah->led_pin, 0);
 412 }
 413
 414 void ath9k_htc_radio_disable(struct ieee80211_hw *hw)
 415 {
 416         struct ath9k_htc_priv *priv = hw->priv;
 417         struct ath_hw *ah = priv->ah;
 418         struct ath_common *common = ath9k_hw_common(ah);
 419         int ret;
 420         u8 cmd_rsp;
 421
 422         ath9k_htc_ps_wakeup(priv);
 423
 424         /* Disable LED */
 425         ath9k_hw_set_gpio(ah, ah->led_pin, 1);
 426         ath9k_hw_cfg_gpio_input(ah, ah->led_pin);
 427
 428         WMI_CMD(WMI_DISABLE_INTR_CMDID);
 429
 430         /* Stop TX */
 431         ieee80211_stop_queues(hw);
 432         htc_stop(priv->htc);
 433         WMI_CMD(WMI_DRAIN_TXQ_ALL_CMDID);
 434         skb_queue_purge(&priv->tx_queue);
 435
 436         /* Stop RX */
 437         WMI_CMD(WMI_STOP_RECV_CMDID);
 438
 439         /*
 440          * The MIB counters have to be disabled here,
 441          * since the target doesn't do it.
 442          */
 443         ath9k_hw_disable_mib_counters(ah);
 444
 445         if (!ah->curchan)
 446                 ah->curchan = ath9k_cmn_get_curchannel(hw, ah);
 447
 448         /* Reset the HW */
 449         ret = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
 450         if (ret) {
 451                 ath_err(common,
 452                         "Unable to reset hardware; reset status %d (freq %u MHz)\n",
 453                         ret, ah->curchan->channel);
 454         }
 455
 456         /* Disable the PHY */
 457         ath9k_hw_phy_disable(ah);
 458
 459         ath9k_htc_ps_restore(priv);
 460         ath9k_htc_setpower(priv, ATH9K_PM_FULL_SLEEP);
 461 }