drivers/net/wireless/ath/ath9k/gpio.c - third_party/linux - Git at Google

 /*
  * 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_led_brightness(struct led_classdev *led_cdev,
 			       enum led_brightness brightness)
 {
 	struct ath_softc *sc = container_of(led_cdev, struct ath_softc, led_cdev);
 	ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, (brightness == LED_OFF));
 }

 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);
 }

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

 	if (sc->sc_ah->led_pin < 0) {
 		if (AR_SREV_9287(sc->sc_ah))
 			sc->sc_ah->led_pin = ATH_LED_PIN_9287;
 		else if (AR_SREV_9485(sc->sc_ah))
 			sc->sc_ah->led_pin = ATH_LED_PIN_9485;
 		else if (AR_SREV_9300(sc->sc_ah))
 			sc->sc_ah->led_pin = ATH_LED_PIN_9300;
 		else
 			sc->sc_ah->led_pin = ATH_LED_PIN_DEF;
 	}

 	/* Configure gpio 1 for output */
 	ath9k_hw_cfg_output(sc->sc_ah, sc->sc_ah->led_pin,
 			    AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 	/* LED off, active low */
 	ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);

 	if (!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;

 	return ath9k_hw_gpio_get(ah, ah->rfkill_gpio) ==
 				  ah->rfkill_polarity;
 }

 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);
 }

 /******************/
 /*     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))) {
 		sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 		/* Detect if colocated bt started scanning */
 		if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
 			ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
 				"BT scan detected\n");
 			sc->sc_flags |= (SC_OP_BT_SCAN |
 					 SC_OP_BT_PRIORITY_DETECTED);
 		} else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 			ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
 				"BT priority traffic detected\n");
 			sc->sc_flags |= SC_OP_BT_PRIORITY_DETECTED;
 		}

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

 static void ath9k_gen_timer_start(struct ath_hw *ah,
 				  struct ath_gen_timer *timer,
 				  u32 trig_timeout,
 				  u32 timer_period)
 {
 	ath9k_hw_gen_timer_start(ah, timer, trig_timeout, timer_period);

 	if ((ah->imask & ATH9K_INT_GENTIMER) == 0) {
 		ath9k_hw_disable_interrupts(ah);
 		ah->imask |= ATH9K_INT_GENTIMER;
 		ath9k_hw_set_interrupts(ah, ah->imask);
 	}
 }

 static void ath9k_gen_timer_stop(struct ath_hw *ah, struct ath_gen_timer *timer)
 {
 	struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers;

 	ath9k_hw_gen_timer_stop(ah, timer);

 	/* if no timer is enabled, turn off interrupt mask */
 	if (timer_table->timer_mask.val == 0) {
 		ath9k_hw_disable_interrupts(ah);
 		ah->imask &= ~ATH9K_INT_GENTIMER;
 		ath9k_hw_set_interrupts(ah, ah->imask);
 	}
 }

 /*
  * 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(unsigned long data)
 {
 	struct ath_softc *sc = (struct ath_softc *) data;
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_btcoex *btcoex = &sc->btcoex;
 	u32 timer_period;
 	bool is_btscan;

 	ath9k_ps_wakeup(sc);
 	ath_detect_bt_priority(sc);

 	is_btscan = sc->sc_flags & SC_OP_BT_SCAN;

 	spin_lock_bh(&btcoex->btcoex_lock);

 	ath9k_hw_btcoex_bt_stomp(ah, is_btscan ? ATH_BTCOEX_STOMP_ALL :
 			      btcoex->bt_stomp_type);

 	spin_unlock_bh(&btcoex->btcoex_lock);

 	if (btcoex->btcoex_period != btcoex->btcoex_no_stomp) {
 		if (btcoex->hw_timer_enabled)
 			ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);

 		timer_period = is_btscan ? btcoex->btscan_no_stomp :
 					   btcoex->btcoex_no_stomp;
 		ath9k_gen_timer_start(ah, btcoex->no_stomp_timer, timer_period,
 				      timer_period * 10);
 		btcoex->hw_timer_enabled = true;
 	}

 	ath9k_ps_restore(sc);
 	mod_timer(&btcoex->period_timer, jiffies +
 				  msecs_to_jiffies(ATH_BTCOEX_DEF_BT_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(void *arg)
 {
 	struct ath_softc *sc = (struct ath_softc *)arg;
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_btcoex *btcoex = &sc->btcoex;
 	struct ath_common *common = ath9k_hw_common(ah);
 	bool is_btscan = sc->sc_flags & SC_OP_BT_SCAN;

 	ath_dbg(common, ATH_DBG_BTCOEX,
 		"no stomp timer running\n");

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

 	if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW || is_btscan)
 		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);

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

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

 	btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;
 	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;

 	setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 			(unsigned long) sc);

 	spin_lock_init(&btcoex->btcoex_lock);

 	btcoex->no_stomp_timer = ath_gen_timer_alloc(sc->sc_ah,
 			ath_btcoex_no_stomp_timer,
 			ath_btcoex_no_stomp_timer,
 			(void *) sc, AR_FIRST_NDP_TIMER);

 	if (!btcoex->no_stomp_timer)
 		return -ENOMEM;

 	return 0;
 }

 /*
  * (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;

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

 	/* make sure duty cycle timer is also stopped when resuming */
 	if (btcoex->hw_timer_enabled)
 		ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);

 	btcoex->bt_priority_cnt = 0;
 	btcoex->bt_priority_time = jiffies;
 	sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);

 	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;

 	del_timer_sync(&btcoex->period_timer);

 	if (btcoex->hw_timer_enabled)
 		ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);

 	btcoex->hw_timer_enabled = false;
 }
	/*
	* 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_led_brightness(struct led_classdev *led_cdev,
	enum led_brightness brightness)
	{
	struct ath_softc *sc = container_of(led_cdev, struct ath_softc, led_cdev);
	ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, (brightness == LED_OFF));
	}

	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);
	}

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

	if (sc->sc_ah->led_pin < 0) {
	if (AR_SREV_9287(sc->sc_ah))
	sc->sc_ah->led_pin = ATH_LED_PIN_9287;
	else if (AR_SREV_9485(sc->sc_ah))
	sc->sc_ah->led_pin = ATH_LED_PIN_9485;
	else if (AR_SREV_9300(sc->sc_ah))
	sc->sc_ah->led_pin = ATH_LED_PIN_9300;
	else
	sc->sc_ah->led_pin = ATH_LED_PIN_DEF;
	}

	/* Configure gpio 1 for output */
	ath9k_hw_cfg_output(sc->sc_ah, sc->sc_ah->led_pin,
	AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
	/* LED off, active low */
	ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);

	if (!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;

	return ath9k_hw_gpio_get(ah, ah->rfkill_gpio) ==
	ah->rfkill_polarity;
	}

	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);
	}

	/******************/
	/* 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))) {
	sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED \| SC_OP_BT_SCAN);
	/* Detect if colocated bt started scanning */
	if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
	ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
	"BT scan detected\n");
	sc->sc_flags \|= (SC_OP_BT_SCAN \|
	SC_OP_BT_PRIORITY_DETECTED);
	} else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
	ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
	"BT priority traffic detected\n");
	sc->sc_flags \|= SC_OP_BT_PRIORITY_DETECTED;
	}

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

	static void ath9k_gen_timer_start(struct ath_hw *ah,
	struct ath_gen_timer *timer,
	u32 trig_timeout,
	u32 timer_period)
	{
	ath9k_hw_gen_timer_start(ah, timer, trig_timeout, timer_period);

	if ((ah->imask & ATH9K_INT_GENTIMER) == 0) {
	ath9k_hw_disable_interrupts(ah);
	ah->imask \|= ATH9K_INT_GENTIMER;
	ath9k_hw_set_interrupts(ah, ah->imask);
	}
	}

	static void ath9k_gen_timer_stop(struct ath_hw ah, struct ath_gen_timer timer)
	{
	struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers;

	ath9k_hw_gen_timer_stop(ah, timer);

	/* if no timer is enabled, turn off interrupt mask */
	if (timer_table->timer_mask.val == 0) {
	ath9k_hw_disable_interrupts(ah);
	ah->imask &= ~ATH9K_INT_GENTIMER;
	ath9k_hw_set_interrupts(ah, ah->imask);
	}
	}

	/*
	* 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(unsigned long data)
	{
	struct ath_softc sc = (struct ath_softc ) data;
	struct ath_hw *ah = sc->sc_ah;
	struct ath_btcoex *btcoex = &sc->btcoex;
	u32 timer_period;
	bool is_btscan;

	ath9k_ps_wakeup(sc);
	ath_detect_bt_priority(sc);

	is_btscan = sc->sc_flags & SC_OP_BT_SCAN;

	spin_lock_bh(&btcoex->btcoex_lock);

	ath9k_hw_btcoex_bt_stomp(ah, is_btscan ? ATH_BTCOEX_STOMP_ALL :
	btcoex->bt_stomp_type);

	spin_unlock_bh(&btcoex->btcoex_lock);

	if (btcoex->btcoex_period != btcoex->btcoex_no_stomp) {
	if (btcoex->hw_timer_enabled)
	ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);

	timer_period = is_btscan ? btcoex->btscan_no_stomp :
	btcoex->btcoex_no_stomp;
	ath9k_gen_timer_start(ah, btcoex->no_stomp_timer, timer_period,
	timer_period * 10);
	btcoex->hw_timer_enabled = true;
	}

	ath9k_ps_restore(sc);
	mod_timer(&btcoex->period_timer, jiffies +
	msecs_to_jiffies(ATH_BTCOEX_DEF_BT_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(void *arg)
	{
	struct ath_softc sc = (struct ath_softc )arg;
	struct ath_hw *ah = sc->sc_ah;
	struct ath_btcoex *btcoex = &sc->btcoex;
	struct ath_common *common = ath9k_hw_common(ah);
	bool is_btscan = sc->sc_flags & SC_OP_BT_SCAN;

	ath_dbg(common, ATH_DBG_BTCOEX,
	"no stomp timer running\n");

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

	if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW \|\| is_btscan)
	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);

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

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

	btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;
	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;

	setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
	(unsigned long) sc);

	spin_lock_init(&btcoex->btcoex_lock);

	btcoex->no_stomp_timer = ath_gen_timer_alloc(sc->sc_ah,
	ath_btcoex_no_stomp_timer,
	ath_btcoex_no_stomp_timer,
	(void *) sc, AR_FIRST_NDP_TIMER);

	if (!btcoex->no_stomp_timer)
	return -ENOMEM;

	return 0;
	}

	/*
	* (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;

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

	/* make sure duty cycle timer is also stopped when resuming */
	if (btcoex->hw_timer_enabled)
	ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);

	btcoex->bt_priority_cnt = 0;
	btcoex->bt_priority_time = jiffies;
	sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED \| SC_OP_BT_SCAN);

	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;

	del_timer_sync(&btcoex->period_timer);

	if (btcoex->hw_timer_enabled)
	ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);

	btcoex->hw_timer_enabled = false;
	}