treewide: fix replace nbd@openwrt.org with nbd@nbd.name
[openwrt.org/openwrt.git] / package / kernel / mac80211 / patches / 548-ath9k_enable_gpio_chip.patch
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From: Michal Cieslakiewicz <michal.cieslakiewicz@wp.pl>
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 <michal.cieslakiewicz@wp.pl>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -24,6 +24,7 @@
 #include <linux/completion.h>
 #include <linux/time.h>
 #include <linux/hw_random.h>
+#include <linux/gpio/driver.h>
 
 #include "common.h"
 #include "debug.h"
@@ -963,6 +964,14 @@ 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;
@@ -1017,6 +1026,9 @@ 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
@@ -16,12 +16,138 @@
 
 #include "ath9k.h"
 #include <linux/ath9k_platform.h>
+#include <linux/gpio.h>
+
+#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_cfg_gpio_input(gc->sc->sc_ah, offset);
+
+       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_cfg_output(gc->sc->sc_ah, offset,
+                           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;
+       u16 ng;
+
+       /* for now only AR9285 and AR9287 are recognized */
+       if (AR_SREV_9287(sc->sc_ah))
+               ng = AR9287_NUM_GPIO;
+       else if (AR_SREV_9285(sc->sc_ah))
+               ng = AR9285_NUM_GPIO;
+       else
+               return;
+
+       gc = kzalloc(sizeof(struct ath9k_gpio_chip), GFP_KERNEL);
+       if (!gc)
+               return;
+
+       snprintf(gc->label, sizeof(gc->label), "ath9k-%s",
+                wiphy_name(sc->hw->wiphy));
+       gc->gchip.label = gc->label;
+       gc->gchip.base = -1;    /* determine base automatically */
+       gc->gchip.ngpio = ng;
+       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;
+       gc->gchip.owner = THIS_MODULE;
+
+       if (gpiochip_add(&gc->gchip)) {
+               kfree(gc);
+               return;
+       }
+
+       sc->gpiochip = gc;
+       gc->sc = sc;
+}
+
+/* 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_led_brightness(struct led_classdev *led_cdev,
                               enum led_brightness brightness)
 {
@@ -60,6 +186,12 @@ 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;
 }
 
@@ -116,11 +248,17 @@ 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);
                kfree(led);
        }
+       ath9k_unregister_gpio_chip(sc);
 }
 
 void ath_init_leds(struct ath_softc *sc)
@@ -135,6 +273,8 @@ void ath_init_leds(struct ath_softc *sc)
        if (AR_SREV_9100(sc->sc_ah))
                return;
 
+       ath9k_register_gpio_chip(sc);
+
        if (pdata && pdata->led_name)
                strncpy(led_name, pdata->led_name, sizeof(led_name));
        else
@@ -186,6 +326,7 @@ void ath_fill_led_pin(struct ath_softc *
        /* LED off, active low */
        ath9k_hw_set_gpio(ah, ah->led_pin, (ah->config.led_active_high) ? 0 : 1);
 }
+
 #endif
 
 /*******************/
 
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