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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@nbd.name>
---
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -25,6 +25,8 @@
#include <linux/completion.h>
#include <linux/time.h>
#include <linux/hw_random.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio/consumer.h>
#include "common.h"
#include "debug.h"
@@ -1048,6 +1050,10 @@ struct ath_softc {
#ifdef CPTCFG_MAC80211_LEDS
const char *led_default_trigger;
struct list_head leds;
+#ifdef CONFIG_GPIOLIB
+ struct gpio_chip *gpiochip;
+ struct gpio_desc *gpiodesc;
+#endif
#endif
#ifdef CPTCFG_ATH9K_DEBUGFS
--- a/drivers/net/wireless/ath/ath9k/gpio.c
+++ b/drivers/net/wireless/ath/ath9k/gpio.c
@@ -16,12 +16,131 @@
#include "ath9k.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 ath_softc *sc = gpiochip_get_data(chip);
+
+ ath9k_hw_gpio_request_in(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 ath_softc *sc = gpiochip_get_data(chip);
+
+ ath9k_hw_gpio_request_out(sc->sc_ah, offset, "ath9k-gpio",
+ AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
+ ath9k_hw_set_gpio(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 ath_softc *sc = gpiochip_get_data(chip);
+ struct ath_hw *ah = sc->sc_ah;
+
+ return !((REG_READ(ah, AR_GPIO_OE_OUT(ah)) >> (offset * 2)) & 3);
+}
+
+/* gpio_chip handler : get GPIO pin value */
+static int ath9k_gpio_pin_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct ath_softc *sc = gpiochip_get_data(chip);
+
+ return ath9k_hw_gpio_get(sc->sc_ah, offset);
+}
+
+/* gpio_chip handler : set GPIO pin to value */
+#if LINUX_VERSION_IS_LESS(6,16,0)
+static void ath9k_gpio_pin_set(struct gpio_chip *chip, unsigned offset,
+ int value)
+#else
+static int ath9k_gpio_pin_set(struct gpio_chip *chip, unsigned offset,
+ int value)
+#endif
+{
+ struct ath_softc *sc = gpiochip_get_data(chip);
+
+ ath9k_hw_set_gpio(sc->sc_ah, offset, value);
+
+#if LINUX_VERSION_IS_GEQ(6,16,0)
+ return 0;
+#endif
+}
+
+/* register GPIO chip */
+static void ath9k_register_gpio_chip(struct ath_softc *sc)
+{
+ struct gpio_chip *gc;
+ struct ath_hw *ah = sc->sc_ah;
+
+ gc = kzalloc(sizeof(struct gpio_chip), GFP_KERNEL);
+ if (!gc)
+ return;
+
+ gc->label = kasprintf(GFP_KERNEL, "ath9k-%s",
+ wiphy_name(sc->hw->wiphy));
+ gc->parent = sc->dev;
+ gc->base = -1; /* determine base automatically */
+ gc->ngpio = ah->caps.num_gpio_pins;
+ gc->direction_input = ath9k_gpio_pin_cfg_input;
+ gc->direction_output = ath9k_gpio_pin_cfg_output;
+ gc->get_direction = ath9k_gpio_pin_get_dir;
+ gc->get = ath9k_gpio_pin_get;
+ gc->set = ath9k_gpio_pin_set;
+
+ if (gpiochip_add_data(gc, sc)) {
+ kfree(gc->label);
+ kfree(gc);
+ return;
+ }
+
+ sc->gpiochip = gc;
+}
+
+/* remove GPIO chip */
+static void ath9k_unregister_gpio_chip(struct ath_softc *sc)
+{
+ struct gpio_chip *gc = sc->gpiochip;
+
+ if (!gc)
+ return;
+
+ gpiochip_remove(gc);
+ kfree(gc->label);
+ kfree(gc);
+}
+
+#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 +199,12 @@ 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)
+ sc->gpiodesc = gpiod_get(sc->dev, gpio->name, GPIOD_ASIS);
+#endif
+
return 0;
}
@@ -117,6 +242,11 @@ 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)
+ gpiod_put(sc->gpiodesc);
+#endif
list_del(&led->list);
ath_led_brightness(&led->cdev, LED_OFF);
led_classdev_unregister(&led->cdev);
@@ -124,6 +254,7 @@ void ath_deinit_leds(struct ath_softc *s
ath9k_hw_gpio_free(sc->sc_ah, gpio->gpio);
kfree(led);
}
+ ath9k_unregister_gpio_chip(sc);
}
void ath_init_leds(struct ath_softc *sc)
@@ -136,6 +267,12 @@ void ath_init_leds(struct ath_softc *sc)
if (AR_SREV_9100(sc->sc_ah))
return;
+ /* setup gpio controller only if requested and skip the led_pin setup */
+ if (device_property_present(sc->dev, "gpio-controller")) {
+ ath9k_register_gpio_chip(sc);
+ return;
+ }
+
ath_fill_led_pin(sc);
snprintf(led_name, sizeof(led_name), "ath9k-%s",
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