/*
 * Copyright (c) 2008-2011 Atheros Communications Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "ath9k.h"

/********************************/
/*       LED functions          */
/********************************/

#ifdef CONFIG_MAC80211_LEDS

static void ath_fill_led_pin(struct ath_softc *sc)
{
        struct ath_hw *ah = sc->sc_ah;

        /* Set default led pin if invalid */
        if (ah->led_pin < 0) {
                if (AR_SREV_9287(ah))
                        ah->led_pin = ATH_LED_PIN_9287;
                else if (AR_SREV_9485(ah))
                        ah->led_pin = ATH_LED_PIN_9485;
                else if (AR_SREV_9300(ah))
                        ah->led_pin = ATH_LED_PIN_9300;
                else if (AR_SREV_9462(ah) || AR_SREV_9565(ah))
                        ah->led_pin = ATH_LED_PIN_9462;
                else
                        ah->led_pin = ATH_LED_PIN_DEF;
        }

        /* Configure gpio for output */
        ath9k_hw_gpio_request_out(ah, ah->led_pin, "ath9k-led",
                                  AR_GPIO_OUTPUT_MUX_AS_OUTPUT);

        /* LED off, active low */
        ath9k_hw_set_gpio(ah, ah->led_pin, ah->config.led_active_high ? 0 : 1);
}

static void ath_led_brightness(struct led_classdev *led_cdev,
                               enum led_brightness brightness)
{
        struct ath_softc *sc = container_of(led_cdev, struct ath_softc, led_cdev);
        u32 val = (brightness == LED_OFF);

        if (sc->sc_ah->config.led_active_high)
                val = !val;

        ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, val);
}

void ath_deinit_leds(struct ath_softc *sc)
{
        if (!sc->led_registered)
                return;

        ath_led_brightness(&sc->led_cdev, LED_OFF);
        led_classdev_unregister(&sc->led_cdev);

        ath9k_hw_gpio_free(sc->sc_ah, sc->sc_ah->led_pin);
}

void ath_init_leds(struct ath_softc *sc)
{
        int ret;

        if (AR_SREV_9100(sc->sc_ah))
                return;

        ath_fill_led_pin(sc);

        if (!ath9k_led_blink)
                sc->led_cdev.default_trigger =
                        ieee80211_get_radio_led_name(sc->hw);

        snprintf(sc->led_name, sizeof(sc->led_name),
                "ath9k-%s", wiphy_name(sc->hw->wiphy));
        sc->led_cdev.name = sc->led_name;
        sc->led_cdev.brightness_set = ath_led_brightness;

        ret = led_classdev_register(wiphy_dev(sc->hw->wiphy), &sc->led_cdev);
        if (ret < 0)
                return;

        sc->led_registered = true;
}
#endif

/*******************/
/*      Rfkill     */
/*******************/

static bool ath_is_rfkill_set(struct ath_softc *sc)
{
        struct ath_hw *ah = sc->sc_ah;
        bool is_blocked;

        ath9k_ps_wakeup(sc);
        is_blocked = ath9k_hw_gpio_get(ah, ah->rfkill_gpio) ==
                                  ah->rfkill_polarity;
        ath9k_ps_restore(sc);

        return is_blocked;
}

void ath9k_rfkill_poll_state(struct ieee80211_hw *hw)
{
        struct ath_softc *sc = hw->priv;
        bool blocked = !!ath_is_rfkill_set(sc);

        wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
}

void ath_start_rfkill_poll(struct ath_softc *sc)
{
        struct ath_hw *ah = sc->sc_ah;

        if (ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
                wiphy_rfkill_start_polling(sc->hw->wiphy);
}

#ifdef CONFIG_ATH9K_BTCOEX_SUPPORT

/******************/
/*     BTCOEX     */
/******************/

/*
 * Detects if there is any priority bt traffic
 */
static void ath_detect_bt_priority(struct ath_softc *sc)
{
        struct ath_btcoex *btcoex = &sc->btcoex;
        struct ath_hw *ah = sc->sc_ah;

        if (ath9k_hw_gpio_get(sc->sc_ah, ah->btcoex_hw.btpriority_gpio))
                btcoex->bt_priority_cnt++;

        if (time_after(jiffies, btcoex->bt_priority_time +
                        msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
                clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
                clear_bit(BT_OP_SCAN, &btcoex->op_flags);
                /* Detect if colocated bt started scanning */
                if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
                        ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
                                "BT scan detected\n");
                        set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
                        set_bit(BT_OP_SCAN, &btcoex->op_flags);
                } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
                        ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
                                "BT priority traffic detected\n");
                        set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
                }

                btcoex->bt_priority_cnt = 0;
                btcoex->bt_priority_time = jiffies;
        }
}

static void ath_mci_ftp_adjust(struct ath_softc *sc)
{
        struct ath_btcoex *btcoex = &sc->btcoex;
        struct ath_mci_profile *mci = &btcoex->mci;
        struct ath_hw *ah = sc->sc_ah;

        if (btcoex->bt_wait_time > ATH_BTCOEX_RX_WAIT_TIME) {
                if (ar9003_mci_state(ah, MCI_STATE_NEED_FTP_STOMP) &&
                    (mci->num_pan || mci->num_other_acl))
                        ah->btcoex_hw.mci.stomp_ftp =
                                (sc->rx.num_pkts < ATH_BTCOEX_STOMP_FTP_THRESH);
                else
                        ah->btcoex_hw.mci.stomp_ftp = false;
                btcoex->bt_wait_time = 0;
                sc->rx.num_pkts = 0;
        }
}

/*
 * This is the master bt coex timer which runs for every
 * 45ms, bt traffic will be given priority during 55% of this
 * period while wlan gets remaining 45%
 */
static void ath_btcoex_period_timer(struct timer_list *t)
{
        struct ath_softc *sc = timer_container_of(sc, t, btcoex.period_timer);
        struct ath_hw *ah = sc->sc_ah;
        struct ath_btcoex *btcoex = &sc->btcoex;
        enum ath_stomp_type stomp_type;
        u32 timer_period;
        unsigned long flags;

        spin_lock_irqsave(&sc->sc_pm_lock, flags);
        if (sc->sc_ah->power_mode == ATH9K_PM_NETWORK_SLEEP) {
                btcoex->bt_wait_time += btcoex->btcoex_period;
                spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
                goto skip_hw_wakeup;
        }
        spin_unlock_irqrestore(&sc->sc_pm_lock, flags);

        ath9k_ps_wakeup(sc);
        spin_lock_bh(&btcoex->btcoex_lock);

        if (ah->caps.hw_caps & ATH9K_HW_CAP_MCI) {
                ath9k_mci_update_rssi(sc);
                ath_mci_ftp_adjust(sc);
        }

        if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
                ath_detect_bt_priority(sc);

        stomp_type = btcoex->bt_stomp_type;
        timer_period = btcoex->btcoex_no_stomp;

        if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI)) {
                if (test_bit(BT_OP_SCAN, &btcoex->op_flags)) {
                        stomp_type = ATH_BTCOEX_STOMP_ALL;
                        timer_period = btcoex->btscan_no_stomp;
                }
        } else if (btcoex->stomp_audio >= 5) {
                stomp_type = ATH_BTCOEX_STOMP_AUDIO;
                btcoex->stomp_audio = 0;
        }

        ath9k_hw_btcoex_bt_stomp(ah, stomp_type);
        ath9k_hw_btcoex_enable(ah);

        spin_unlock_bh(&btcoex->btcoex_lock);

        if (btcoex->btcoex_period != btcoex->btcoex_no_stomp)
                mod_timer(&btcoex->no_stomp_timer,
                         jiffies + msecs_to_jiffies(timer_period));

        ath9k_ps_restore(sc);

skip_hw_wakeup:
        mod_timer(&btcoex->period_timer,
                  jiffies + msecs_to_jiffies(btcoex->btcoex_period));
}

/*
 * Generic tsf based hw timer which configures weight
 * registers to time slice between wlan and bt traffic
 */
static void ath_btcoex_no_stomp_timer(struct timer_list *t)
{
        struct ath_softc *sc = timer_container_of(sc, t,
                                                  btcoex.no_stomp_timer);
        struct ath_hw *ah = sc->sc_ah;
        struct ath_btcoex *btcoex = &sc->btcoex;

        ath9k_ps_wakeup(sc);
        spin_lock_bh(&btcoex->btcoex_lock);

        if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW ||
            (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI) &&
             test_bit(BT_OP_SCAN, &btcoex->op_flags)))
                ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
        else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
                ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);

        ath9k_hw_btcoex_enable(ah);
        spin_unlock_bh(&btcoex->btcoex_lock);
        ath9k_ps_restore(sc);
}

static void ath_init_btcoex_timer(struct ath_softc *sc)
{
        struct ath_btcoex *btcoex = &sc->btcoex;

        btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD;
        btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
                btcoex->btcoex_period / 100;
        btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
                                   btcoex->btcoex_period / 100;
        btcoex->bt_stomp_type = ATH_BTCOEX_STOMP_LOW;

        timer_setup(&btcoex->period_timer, ath_btcoex_period_timer, 0);
        timer_setup(&btcoex->no_stomp_timer, ath_btcoex_no_stomp_timer, 0);

        spin_lock_init(&btcoex->btcoex_lock);
}

/*
 * (Re)start btcoex timers
 */
void ath9k_btcoex_timer_resume(struct ath_softc *sc)
{
        struct ath_btcoex *btcoex = &sc->btcoex;
        struct ath_hw *ah = sc->sc_ah;

        if (ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_3WIRE &&
            ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_MCI)
                return;

        ath_dbg(ath9k_hw_common(ah), BTCOEX, "Starting btcoex timers\n");

        /* make sure duty cycle timer is also stopped when resuming */
        timer_delete_sync(&btcoex->no_stomp_timer);

        btcoex->bt_priority_cnt = 0;
        btcoex->bt_priority_time = jiffies;
        clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
        clear_bit(BT_OP_SCAN, &btcoex->op_flags);

        mod_timer(&btcoex->period_timer, jiffies);
}

/*
 * Pause btcoex timer and bt duty cycle timer
 */
void ath9k_btcoex_timer_pause(struct ath_softc *sc)
{
        struct ath_btcoex *btcoex = &sc->btcoex;
        struct ath_hw *ah = sc->sc_ah;

        if (ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_3WIRE &&
            ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_MCI)
                return;

        ath_dbg(ath9k_hw_common(ah), BTCOEX, "Stopping btcoex timers\n");

        timer_delete_sync(&btcoex->period_timer);
        timer_delete_sync(&btcoex->no_stomp_timer);
}

void ath9k_btcoex_stop_gen_timer(struct ath_softc *sc)
{
        struct ath_btcoex *btcoex = &sc->btcoex;

        timer_delete_sync(&btcoex->no_stomp_timer);
}

u16 ath9k_btcoex_aggr_limit(struct ath_softc *sc, u32 max_4ms_framelen)
{
        struct ath_btcoex *btcoex = &sc->btcoex;
        struct ath_mci_profile *mci = &sc->btcoex.mci;
        u16 aggr_limit = 0;

        if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI) && mci->aggr_limit)
                aggr_limit = (max_4ms_framelen * mci->aggr_limit) >> 4;
        else if (test_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags))
                aggr_limit = min((max_4ms_framelen * 3) / 8,
                                 (u32)ATH_AMPDU_LIMIT_MAX);

        return aggr_limit;
}

void ath9k_btcoex_handle_interrupt(struct ath_softc *sc, u32 status)
{
        if (status & ATH9K_INT_MCI)
                ath_mci_intr(sc);
}

void ath9k_start_btcoex(struct ath_softc *sc)
{
        struct ath_hw *ah = sc->sc_ah;

        if (ah->btcoex_hw.enabled ||
            ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
                return;

        if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
                ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
                                           AR_STOMP_LOW_WLAN_WGHT, 0);
        else
                ath9k_hw_btcoex_set_weight(ah, 0, 0,
                                           ATH_BTCOEX_STOMP_NONE);
        ath9k_hw_btcoex_enable(ah);
        ath9k_btcoex_timer_resume(sc);
}

void ath9k_stop_btcoex(struct ath_softc *sc)
{
        struct ath_hw *ah = sc->sc_ah;

        if (!ah->btcoex_hw.enabled ||
            ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
                return;

        ath9k_btcoex_timer_pause(sc);
        ath9k_hw_btcoex_disable(ah);

        if (ah->caps.hw_caps & ATH9K_HW_CAP_MCI)
                ath_mci_flush_profile(&sc->btcoex.mci);
}

void ath9k_deinit_btcoex(struct ath_softc *sc)
{
        struct ath_hw *ah = sc->sc_ah;

        if (ath9k_hw_mci_is_enabled(ah))
                ath_mci_cleanup(sc);
        else {
                enum ath_btcoex_scheme scheme = ath9k_hw_get_btcoex_scheme(ah);

                if (scheme == ATH_BTCOEX_CFG_2WIRE ||
                    scheme == ATH_BTCOEX_CFG_3WIRE)
                        ath9k_hw_btcoex_deinit(sc->sc_ah);
        }
}

int ath9k_init_btcoex(struct ath_softc *sc)
{
        struct ath_txq *txq;
        struct ath_hw *ah = sc->sc_ah;
        int r;

        ath9k_hw_btcoex_init_scheme(ah);

        switch (ath9k_hw_get_btcoex_scheme(sc->sc_ah)) {
        case ATH_BTCOEX_CFG_NONE:
                break;
        case ATH_BTCOEX_CFG_2WIRE:
                ath9k_hw_btcoex_init_2wire(sc->sc_ah);
                break;
        case ATH_BTCOEX_CFG_3WIRE:
                ath9k_hw_btcoex_init_3wire(sc->sc_ah);
                ath_init_btcoex_timer(sc);
                txq = sc->tx.txq_map[IEEE80211_AC_BE];
                ath9k_hw_init_btcoex_hw(sc->sc_ah, txq->axq_qnum);
                break;
        case ATH_BTCOEX_CFG_MCI:
                ath_init_btcoex_timer(sc);

                sc->btcoex.duty_cycle = ATH_BTCOEX_DEF_DUTY_CYCLE;
                INIT_LIST_HEAD(&sc->btcoex.mci.info);
                ath9k_hw_btcoex_init_mci(ah);

                r = ath_mci_setup(sc);
                if (r)
                        return r;

                break;
        default:
                WARN_ON(1);
                break;
        }

        return 0;
}

static int ath9k_dump_mci_btcoex(struct ath_softc *sc, u8 *buf, u32 size)
{
        struct ath_btcoex *btcoex = &sc->btcoex;
        struct ath_mci_profile *mci = &btcoex->mci;
        struct ath_hw *ah = sc->sc_ah;
        struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
        u32 len = 0;
        int i;

        ATH_DUMP_BTCOEX("Total BT profiles", NUM_PROF(mci));
        ATH_DUMP_BTCOEX("MGMT", mci->num_mgmt);
        ATH_DUMP_BTCOEX("SCO", mci->num_sco);
        ATH_DUMP_BTCOEX("A2DP", mci->num_a2dp);
        ATH_DUMP_BTCOEX("HID", mci->num_hid);
        ATH_DUMP_BTCOEX("PAN", mci->num_pan);
        ATH_DUMP_BTCOEX("ACL", mci->num_other_acl);
        ATH_DUMP_BTCOEX("BDR", mci->num_bdr);
        ATH_DUMP_BTCOEX("Aggr. Limit", mci->aggr_limit);
        ATH_DUMP_BTCOEX("Stomp Type", btcoex->bt_stomp_type);
        ATH_DUMP_BTCOEX("BTCoex Period (msec)", btcoex->btcoex_period);
        ATH_DUMP_BTCOEX("Duty Cycle", btcoex->duty_cycle);
        ATH_DUMP_BTCOEX("BT Wait time", btcoex->bt_wait_time);
        ATH_DUMP_BTCOEX("Concurrent Tx", btcoex_hw->mci.concur_tx);
        ATH_DUMP_BTCOEX("Concurrent RSSI cnt", btcoex->rssi_count);

        len += scnprintf(buf + len, size - len, "BT Weights: ");
        for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
                len += scnprintf(buf + len, size - len, "%08x ",
                                 btcoex_hw->bt_weight[i]);
        len += scnprintf(buf + len, size - len, "\n");
        len += scnprintf(buf + len, size - len, "WLAN Weights: ");
        for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
                len += scnprintf(buf + len, size - len, "%08x ",
                                 btcoex_hw->wlan_weight[i]);
        len += scnprintf(buf + len, size - len, "\n");
        len += scnprintf(buf + len, size - len, "Tx Priorities: ");
        for (i = 0; i < ATH_BTCOEX_STOMP_MAX; i++)
                len += scnprintf(buf + len, size - len, "%08x ",
                                btcoex_hw->tx_prio[i]);

        len += scnprintf(buf + len, size - len, "\n");

        return len;
}

static int ath9k_dump_legacy_btcoex(struct ath_softc *sc, u8 *buf, u32 size)
{

        struct ath_btcoex *btcoex = &sc->btcoex;
        u32 len = 0;

        ATH_DUMP_BTCOEX("Stomp Type", btcoex->bt_stomp_type);
        ATH_DUMP_BTCOEX("BTCoex Period (msec)", btcoex->btcoex_period);
        ATH_DUMP_BTCOEX("Duty Cycle", btcoex->duty_cycle);
        ATH_DUMP_BTCOEX("BT Wait time", btcoex->bt_wait_time);

        return len;
}

int ath9k_dump_btcoex(struct ath_softc *sc, u8 *buf, u32 size)
{
        if (ath9k_hw_mci_is_enabled(sc->sc_ah))
                return ath9k_dump_mci_btcoex(sc, buf, size);
        else
                return ath9k_dump_legacy_btcoex(sc, buf, size);
}

#endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */