From: Michal Cieslakiewicz Date: Sun, 31 Jan 2016 21:01:31 +0100 Subject: [PATCH v4 4/8] mac80211: ath9k: enable access to GPIO Enable access to GPIO chip and its pins for Atheros AR92xx wireless devices. For now AR9285 and AR9287 are supported. Signed-off-by: Michal Cieslakiewicz Signed-off-by: Felix Fietkau --- --- a/drivers/net/wireless/ath/ath9k/ath9k.h +++ b/drivers/net/wireless/ath/ath9k/ath9k.h @@ -24,6 +24,7 @@ #include #include #include +#include #include "common.h" #include "debug.h" @@ -1001,6 +1002,14 @@ struct ath_led { struct led_classdev cdev; }; +#ifdef CONFIG_GPIOLIB +struct ath9k_gpio_chip { + struct ath_softc *sc; + char label[32]; + struct gpio_chip gchip; +}; +#endif + struct ath_softc { struct ieee80211_hw *hw; struct device *dev; @@ -1058,6 +1067,9 @@ struct ath_softc { #ifdef CPTCFG_MAC80211_LEDS const char *led_default_trigger; struct list_head leds; +#ifdef CONFIG_GPIOLIB + struct ath9k_gpio_chip *gpiochip; +#endif #endif #ifdef CPTCFG_ATH9K_DEBUGFS --- a/drivers/net/wireless/ath/ath9k/gpio.c +++ b/drivers/net/wireless/ath/ath9k/gpio.c @@ -16,13 +16,135 @@ #include "ath9k.h" #include +#include + +#ifdef CPTCFG_MAC80211_LEDS + +#ifdef CONFIG_GPIOLIB + +/***************/ +/* GPIO Chip */ +/***************/ + +/* gpio_chip handler : set GPIO to input */ +static int ath9k_gpio_pin_cfg_input(struct gpio_chip *chip, unsigned offset) +{ + struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip, + gchip); + + ath9k_hw_gpio_request_in(gc->sc->sc_ah, offset, "ath9k-gpio"); + + return 0; +} + +/* gpio_chip handler : set GPIO to output */ +static int ath9k_gpio_pin_cfg_output(struct gpio_chip *chip, unsigned offset, + int value) +{ + struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip, + gchip); + + ath9k_hw_gpio_request_out(gc->sc->sc_ah, offset, "ath9k-gpio", + AR_GPIO_OUTPUT_MUX_AS_OUTPUT); + ath9k_hw_set_gpio(gc->sc->sc_ah, offset, value); + + return 0; +} + +/* gpio_chip handler : query GPIO direction (0=out, 1=in) */ +static int ath9k_gpio_pin_get_dir(struct gpio_chip *chip, unsigned offset) +{ + struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip, + gchip); + struct ath_hw *ah = gc->sc->sc_ah; + + return !((REG_READ(ah, AR_GPIO_OE_OUT) >> (offset * 2)) & 3); +} + +/* gpio_chip handler : get GPIO pin value */ +static int ath9k_gpio_pin_get(struct gpio_chip *chip, unsigned offset) +{ + struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip, + gchip); + + return ath9k_hw_gpio_get(gc->sc->sc_ah, offset); +} + +/* gpio_chip handler : set GPIO pin to value */ +static void ath9k_gpio_pin_set(struct gpio_chip *chip, unsigned offset, + int value) +{ + struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip, + gchip); + + ath9k_hw_set_gpio(gc->sc->sc_ah, offset, value); +} + +/* register GPIO chip */ +static void ath9k_register_gpio_chip(struct ath_softc *sc) +{ + struct ath9k_gpio_chip *gc; + struct ath_hw *ah = sc->sc_ah; + + gc = kzalloc(sizeof(struct ath9k_gpio_chip), GFP_KERNEL); + if (!gc) + return; + + gc->sc = sc; + snprintf(gc->label, sizeof(gc->label), "ath9k-%s", + wiphy_name(sc->hw->wiphy)); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,5,0) + gc->gchip.parent = sc->dev; +#else + gc->gchip.dev = sc->dev; +#endif + gc->gchip.label = gc->label; + gc->gchip.base = -1; /* determine base automatically */ + gc->gchip.ngpio = ah->caps.num_gpio_pins; + gc->gchip.direction_input = ath9k_gpio_pin_cfg_input; + gc->gchip.direction_output = ath9k_gpio_pin_cfg_output; + gc->gchip.get_direction = ath9k_gpio_pin_get_dir; + gc->gchip.get = ath9k_gpio_pin_get; + gc->gchip.set = ath9k_gpio_pin_set; + + if (gpiochip_add(&gc->gchip)) { + kfree(gc); + return; + } + + gc->gchip.owner = NULL; + sc->gpiochip = gc; +} + +/* remove GPIO chip */ +static void ath9k_unregister_gpio_chip(struct ath_softc *sc) +{ + struct ath9k_gpio_chip *gc = sc->gpiochip; + + if (!gc) + return; + + gpiochip_remove(&gc->gchip); + kfree(gc); + sc->gpiochip = NULL; +} + +#else /* CONFIG_GPIOLIB */ + +static inline void ath9k_register_gpio_chip(struct ath_softc *sc) +{ +} + +static inline void ath9k_unregister_gpio_chip(struct ath_softc *sc) +{ +} + +#endif /* CONFIG_GPIOLIB */ /********************************/ /* LED functions */ /********************************/ -#ifdef CPTCFG_MAC80211_LEDS - static void ath_fill_led_pin(struct ath_softc *sc) { struct ath_hw *ah = sc->sc_ah; @@ -80,6 +202,12 @@ static int ath_add_led(struct ath_softc else ath9k_hw_set_gpio(sc->sc_ah, gpio->gpio, gpio->active_low); +#ifdef CONFIG_GPIOLIB + /* If there is GPIO chip configured, reserve LED pin */ + if (sc->gpiochip) + gpio_request(sc->gpiochip->gchip.base + gpio->gpio, gpio->name); +#endif + return 0; } @@ -136,17 +264,24 @@ void ath_deinit_leds(struct ath_softc *s while (!list_empty(&sc->leds)) { led = list_first_entry(&sc->leds, struct ath_led, list); +#ifdef CONFIG_GPIOLIB + /* If there is GPIO chip configured, free LED pin */ + if (sc->gpiochip) + gpio_free(sc->gpiochip->gchip.base + led->gpio->gpio); +#endif list_del(&led->list); ath_led_brightness(&led->cdev, LED_OFF); led_classdev_unregister(&led->cdev); ath9k_hw_gpio_free(sc->sc_ah, led->gpio->gpio); kfree(led); } + ath9k_unregister_gpio_chip(sc); } void ath_init_leds(struct ath_softc *sc) { struct ath9k_platform_data *pdata = sc->dev->platform_data; + struct device_node *np = sc->dev->of_node; char led_name[32]; const char *trigger; int i; @@ -156,6 +291,15 @@ void ath_init_leds(struct ath_softc *sc) if (AR_SREV_9100(sc->sc_ah)) return; + if (!np) + ath9k_register_gpio_chip(sc); + + /* setup gpio controller only if requested and skip the led_pin setup */ + if (of_property_read_bool(np, "gpio-controller")) { + ath9k_register_gpio_chip(sc); + return; + } + ath_fill_led_pin(sc); if (pdata && pdata->leds && pdata->num_leds) @@ -180,6 +324,7 @@ void ath_init_leds(struct ath_softc *sc) ath_create_gpio_led(sc, sc->sc_ah->led_pin, led_name, trigger, !sc->sc_ah->config.led_active_high); } + #endif /*******************/