LXR linux/drivers/net/wireless/ath/ath9k/htc_drv

   1/*
   2 * Copyright (c) 2010-2011 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#define ATH_HTC_BTCOEX_PRODUCT_ID "wb193"
  24
  25#ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
  26
  27/*
  28 * Detects if there is any priority bt traffic
  29 */
  30static void ath_detect_bt_priority(struct ath9k_htc_priv *priv)
  31{
  32        struct ath_btcoex *btcoex = &priv->btcoex;
  33        struct ath_hw *ah = priv->ah;
  34
  35        if (ath9k_hw_gpio_get(ah, ah->btcoex_hw.btpriority_gpio))
  36                btcoex->bt_priority_cnt++;
  37
  38        if (time_after(jiffies, btcoex->bt_priority_time +
  39                        msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
  40                clear_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
  41                clear_bit(OP_BT_SCAN, &priv->op_flags);
  42                /* Detect if colocated bt started scanning */
  43                if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
  44                        ath_dbg(ath9k_hw_common(ah), BTCOEX,
  45                                "BT scan detected\n");
  46                        set_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
  47                        set_bit(OP_BT_SCAN, &priv->op_flags);
  48                } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
  49                        ath_dbg(ath9k_hw_common(ah), BTCOEX,
  50                                "BT priority traffic detected\n");
  51                        set_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
  52                }
  53
  54                btcoex->bt_priority_cnt = 0;
  55                btcoex->bt_priority_time = jiffies;
  56        }
  57}
  58
  59/*
  60 * This is the master bt coex work which runs for every
  61 * 45ms, bt traffic will be given priority during 55% of this
  62 * period while wlan gets remaining 45%
  63 */
  64static void ath_btcoex_period_work(struct work_struct *work)
  65{
  66        struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
  67                                                   coex_period_work.work);
  68        struct ath_btcoex *btcoex = &priv->btcoex;
  69        struct ath_common *common = ath9k_hw_common(priv->ah);
  70        u32 timer_period;
  71        int ret;
  72
  73        ath_detect_bt_priority(priv);
  74
  75        ret = ath9k_htc_update_cap_target(priv,
  76                          test_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags));
  77        if (ret) {
  78                ath_err(common, "Unable to set BTCOEX parameters\n");
  79                return;
  80        }
  81
  82        ath9k_hw_btcoex_bt_stomp(priv->ah, test_bit(OP_BT_SCAN, &priv->op_flags) ?
  83                                 ATH_BTCOEX_STOMP_ALL : btcoex->bt_stomp_type);
  84
  85        ath9k_hw_btcoex_enable(priv->ah);
  86        timer_period = test_bit(OP_BT_SCAN, &priv->op_flags) ?
  87                btcoex->btscan_no_stomp : btcoex->btcoex_no_stomp;
  88        ieee80211_queue_delayed_work(priv->hw, &priv->duty_cycle_work,
  89                                     msecs_to_jiffies(timer_period));
  90        ieee80211_queue_delayed_work(priv->hw, &priv->coex_period_work,
  91                                     msecs_to_jiffies(btcoex->btcoex_period));
  92}
  93
  94/*
  95 * Work to time slice between wlan and bt traffic and
  96 * configure weight registers
  97 */
  98static void ath_btcoex_duty_cycle_work(struct work_struct *work)
  99{
 100        struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
 101                                                   duty_cycle_work.work);
 102        struct ath_hw *ah = priv->ah;
 103        struct ath_btcoex *btcoex = &priv->btcoex;
 104        struct ath_common *common = ath9k_hw_common(ah);
 105
 106        ath_dbg(common, BTCOEX, "time slice work for bt and wlan\n");
 107
 108        if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW ||
 109            test_bit(OP_BT_SCAN, &priv->op_flags))
 110                ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 111        else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 112                ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
 113
 114        ath9k_hw_btcoex_enable(priv->ah);
 115}
 116
 117static void ath_htc_init_btcoex_work(struct ath9k_htc_priv *priv)
 118{
 119        struct ath_btcoex *btcoex = &priv->btcoex;
 120
 121        btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD;
 122        btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 123                btcoex->btcoex_period / 100;
 124        btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
 125                                   btcoex->btcoex_period / 100;
 126        INIT_DELAYED_WORK(&priv->coex_period_work, ath_btcoex_period_work);
 127        INIT_DELAYED_WORK(&priv->duty_cycle_work, ath_btcoex_duty_cycle_work);
 128}
 129
 130/*
 131 * (Re)start btcoex work
 132 */
 133
 134static void ath_htc_resume_btcoex_work(struct ath9k_htc_priv *priv)
 135{
 136        struct ath_btcoex *btcoex = &priv->btcoex;
 137        struct ath_hw *ah = priv->ah;
 138
 139        ath_dbg(ath9k_hw_common(ah), BTCOEX, "Starting btcoex work\n");
 140
 141        btcoex->bt_priority_cnt = 0;
 142        btcoex->bt_priority_time = jiffies;
 143        clear_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
 144        clear_bit(OP_BT_SCAN, &priv->op_flags);
 145        ieee80211_queue_delayed_work(priv->hw, &priv->coex_period_work, 0);
 146}
 147
 148
 149/*
 150 * Cancel btcoex and bt duty cycle work.
 151 */
 152static void ath_htc_cancel_btcoex_work(struct ath9k_htc_priv *priv)
 153{
 154        cancel_delayed_work_sync(&priv->coex_period_work);
 155        cancel_delayed_work_sync(&priv->duty_cycle_work);
 156}
 157
 158void ath9k_htc_start_btcoex(struct ath9k_htc_priv *priv)
 159{
 160        struct ath_hw *ah = priv->ah;
 161
 162        if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE) {
 163                ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 164                                           AR_STOMP_LOW_WLAN_WGHT, 0);
 165                ath9k_hw_btcoex_enable(ah);
 166                ath_htc_resume_btcoex_work(priv);
 167        }
 168}
 169
 170void ath9k_htc_stop_btcoex(struct ath9k_htc_priv *priv)
 171{
 172        struct ath_hw *ah = priv->ah;
 173
 174        if (ah->btcoex_hw.enabled &&
 175            ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) {
 176                if (ah->btcoex_hw.scheme == ATH_BTCOEX_CFG_3WIRE)
 177                        ath_htc_cancel_btcoex_work(priv);
 178                ath9k_hw_btcoex_disable(ah);
 179        }
 180}
 181
 182void ath9k_htc_init_btcoex(struct ath9k_htc_priv *priv, char *product)
 183{
 184        struct ath_hw *ah = priv->ah;
 185        struct ath_common *common = ath9k_hw_common(ah);
 186        int qnum;
 187
 188        /*
 189         * Check if BTCOEX is globally disabled.
 190         */
 191        if (!common->btcoex_enabled) {
 192                ah->btcoex_hw.scheme = ATH_BTCOEX_CFG_NONE;
 193                return;
 194        }
 195
 196        if (product && strncmp(product, ATH_HTC_BTCOEX_PRODUCT_ID, 5) == 0) {
 197                ah->btcoex_hw.scheme = ATH_BTCOEX_CFG_3WIRE;
 198        }
 199
 200        switch (ath9k_hw_get_btcoex_scheme(priv->ah)) {
 201        case ATH_BTCOEX_CFG_NONE:
 202                break;
 203        case ATH_BTCOEX_CFG_3WIRE:
 204                priv->ah->btcoex_hw.btactive_gpio = 7;
 205                priv->ah->btcoex_hw.btpriority_gpio = 6;
 206                priv->ah->btcoex_hw.wlanactive_gpio = 8;
 207                priv->btcoex.bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
 208                ath9k_hw_btcoex_init_3wire(priv->ah);
 209                ath_htc_init_btcoex_work(priv);
 210                qnum = priv->hwq_map[IEEE80211_AC_BE];
 211                ath9k_hw_init_btcoex_hw(priv->ah, qnum);
 212                break;
 213        default:
 214                WARN_ON(1);
 215                break;
 216        }
 217}
 218
 219#endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */
 220
 221/*******/
 222/* LED */
 223/*******/
 224
 225#ifdef CONFIG_MAC80211_LEDS
 226void ath9k_led_work(struct work_struct *work)
 227{
 228        struct ath9k_htc_priv *priv = container_of(work,
 229                                                   struct ath9k_htc_priv,
 230                                                   led_work);
 231
 232        ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin,
 233                          (priv->brightness == LED_OFF));
 234}
 235
 236static void ath9k_led_brightness(struct led_classdev *led_cdev,
 237                                 enum led_brightness brightness)
 238{
 239        struct ath9k_htc_priv *priv = container_of(led_cdev,
 240                                                   struct ath9k_htc_priv,
 241                                                   led_cdev);
 242
 243        /* Not locked, but it's just a tiny green light..*/
 244        priv->brightness = brightness;
 245        ieee80211_queue_work(priv->hw, &priv->led_work);
 246}
 247
 248void ath9k_deinit_leds(struct ath9k_htc_priv *priv)
 249{
 250        if (!priv->led_registered)
 251                return;
 252
 253        ath9k_led_brightness(&priv->led_cdev, LED_OFF);
 254        led_classdev_unregister(&priv->led_cdev);
 255        cancel_work_sync(&priv->led_work);
 256}
 257
 258void ath9k_init_leds(struct ath9k_htc_priv *priv)
 259{
 260        int ret;
 261
 262        if (AR_SREV_9287(priv->ah))
 263                priv->ah->led_pin = ATH_LED_PIN_9287;
 264        else if (AR_SREV_9271(priv->ah))
 265                priv->ah->led_pin = ATH_LED_PIN_9271;
 266        else if (AR_DEVID_7010(priv->ah))
 267                priv->ah->led_pin = ATH_LED_PIN_7010;
 268        else
 269                priv->ah->led_pin = ATH_LED_PIN_DEF;
 270
 271        /* Configure gpio 1 for output */
 272        ath9k_hw_cfg_output(priv->ah, priv->ah->led_pin,
 273                            AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 274        /* LED off, active low */
 275        ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin, 1);
 276
 277        snprintf(priv->led_name, sizeof(priv->led_name),
 278                "ath9k_htc-%s", wiphy_name(priv->hw->wiphy));
 279        priv->led_cdev.name = priv->led_name;
 280        priv->led_cdev.brightness_set = ath9k_led_brightness;
 281
 282        ret = led_classdev_register(wiphy_dev(priv->hw->wiphy), &priv->led_cdev);
 283        if (ret < 0)
 284                return;
 285
 286        INIT_WORK(&priv->led_work, ath9k_led_work);
 287        priv->led_registered = true;
 288
 289        return;
 290}
 291#endif
 292
 293/*******************/
 294/*      Rfkill     */
 295/*******************/
 296
 297static bool ath_is_rfkill_set(struct ath9k_htc_priv *priv)
 298{
 299        bool is_blocked;
 300
 301        ath9k_htc_ps_wakeup(priv);
 302        is_blocked = ath9k_hw_gpio_get(priv->ah, priv->ah->rfkill_gpio) ==
 303                                                 priv->ah->rfkill_polarity;
 304        ath9k_htc_ps_restore(priv);
 305
 306        return is_blocked;
 307}
 308
 309void ath9k_htc_rfkill_poll_state(struct ieee80211_hw *hw)
 310{
 311        struct ath9k_htc_priv *priv = hw->priv;
 312        bool blocked = !!ath_is_rfkill_set(priv);
 313
 314        wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
 315}
 316
 317void ath9k_start_rfkill_poll(struct ath9k_htc_priv *priv)
 318{
 319        if (priv->ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 320                wiphy_rfkill_start_polling(priv->hw->wiphy);
 321}
 322