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252 lines
6.3 KiB
Diff
252 lines
6.3 KiB
Diff
From: Michal Cieslakiewicz <michal.cieslakiewicz@wp.pl>
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Date: Sun, 31 Jan 2016 21:01:31 +0100
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Subject: [PATCH v4 4/8] mac80211: ath9k: enable access to GPIO
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Enable access to GPIO chip and its pins for Atheros AR92xx
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wireless devices. For now AR9285 and AR9287 are supported.
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Signed-off-by: Michal Cieslakiewicz <michal.cieslakiewicz@wp.pl>
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/drivers/net/wireless/ath/ath9k/ath9k.h
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+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
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@@ -24,6 +24,7 @@
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#include <linux/completion.h>
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#include <linux/time.h>
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#include <linux/hw_random.h>
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+#include <linux/gpio/driver.h>
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#include "common.h"
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#include "debug.h"
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@@ -989,6 +990,14 @@ struct ath_led {
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struct led_classdev cdev;
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};
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+#ifdef CONFIG_GPIOLIB
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+struct ath9k_gpio_chip {
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+ struct ath_softc *sc;
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+ char label[32];
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+ struct gpio_chip gchip;
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+};
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+#endif
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+
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struct ath_softc {
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struct ieee80211_hw *hw;
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struct device *dev;
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@@ -1044,6 +1053,9 @@ struct ath_softc {
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#ifdef CPTCFG_MAC80211_LEDS
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const char *led_default_trigger;
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struct list_head leds;
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+#ifdef CONFIG_GPIOLIB
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+ struct ath9k_gpio_chip *gpiochip;
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+#endif
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#endif
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#ifdef CPTCFG_ATH9K_DEBUGFS
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--- a/drivers/net/wireless/ath/ath9k/gpio.c
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+++ b/drivers/net/wireless/ath/ath9k/gpio.c
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@@ -16,13 +16,139 @@
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#include "ath9k.h"
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#include <linux/ath9k_platform.h>
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+#include <linux/gpio.h>
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+
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+#ifdef CPTCFG_MAC80211_LEDS
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+
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+#ifdef CONFIG_GPIOLIB
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+
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+/***************/
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+/* GPIO Chip */
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+/***************/
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+
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+/* gpio_chip handler : set GPIO to input */
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+static int ath9k_gpio_pin_cfg_input(struct gpio_chip *chip, unsigned offset)
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+{
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+ struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
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+ gchip);
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+
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+ ath9k_hw_gpio_request_in(gc->sc->sc_ah, offset, "ath9k-gpio");
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+
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+ return 0;
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+}
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+
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+/* gpio_chip handler : set GPIO to output */
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+static int ath9k_gpio_pin_cfg_output(struct gpio_chip *chip, unsigned offset,
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+ int value)
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+{
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+ struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
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+ gchip);
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+
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+ ath9k_hw_gpio_request_out(gc->sc->sc_ah, offset, "ath9k-gpio",
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+ AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
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+ ath9k_hw_set_gpio(gc->sc->sc_ah, offset, value);
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+
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+ return 0;
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+}
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+
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+/* gpio_chip handler : query GPIO direction (0=out, 1=in) */
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+static int ath9k_gpio_pin_get_dir(struct gpio_chip *chip, unsigned offset)
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+{
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+ struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
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+ gchip);
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+ struct ath_hw *ah = gc->sc->sc_ah;
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+
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+ return !((REG_READ(ah, AR_GPIO_OE_OUT) >> (offset * 2)) & 3);
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+}
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+
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+/* gpio_chip handler : get GPIO pin value */
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+static int ath9k_gpio_pin_get(struct gpio_chip *chip, unsigned offset)
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+{
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+ struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
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+ gchip);
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+
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+ return ath9k_hw_gpio_get(gc->sc->sc_ah, offset);
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+}
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+
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+/* gpio_chip handler : set GPIO pin to value */
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+static void ath9k_gpio_pin_set(struct gpio_chip *chip, unsigned offset,
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+ int value)
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+{
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+ struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
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+ gchip);
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+
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+ ath9k_hw_set_gpio(gc->sc->sc_ah, offset, value);
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+}
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+
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+/* register GPIO chip */
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+static void ath9k_register_gpio_chip(struct ath_softc *sc)
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+{
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+ struct ath9k_gpio_chip *gc;
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+ struct ath_hw *ah = sc->sc_ah;
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+
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+ gc = kzalloc(sizeof(struct ath9k_gpio_chip), GFP_KERNEL);
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+ if (!gc)
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+ return;
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+
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+ gc->sc = sc;
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+ snprintf(gc->label, sizeof(gc->label), "ath9k-%s",
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+ wiphy_name(sc->hw->wiphy));
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+#ifdef CONFIG_OF
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+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,5,0)
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+ gc->gchip.parent = sc->dev;
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+#else
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+ gc->gchip.dev = sc->dev;
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+#endif
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+#endif
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+ gc->gchip.label = gc->label;
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+ gc->gchip.base = -1; /* determine base automatically */
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+ gc->gchip.ngpio = ah->caps.num_gpio_pins;
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+ gc->gchip.direction_input = ath9k_gpio_pin_cfg_input;
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+ gc->gchip.direction_output = ath9k_gpio_pin_cfg_output;
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+ gc->gchip.get_direction = ath9k_gpio_pin_get_dir;
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+ gc->gchip.get = ath9k_gpio_pin_get;
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+ gc->gchip.set = ath9k_gpio_pin_set;
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+
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+ if (gpiochip_add(&gc->gchip)) {
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+ kfree(gc);
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+ return;
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+ }
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+
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+#ifdef CONFIG_OF
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+ gc->gchip.owner = NULL;
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+#endif
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+ sc->gpiochip = gc;
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+}
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+
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+/* remove GPIO chip */
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+static void ath9k_unregister_gpio_chip(struct ath_softc *sc)
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+{
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+ struct ath9k_gpio_chip *gc = sc->gpiochip;
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+
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+ if (!gc)
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+ return;
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+
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+ gpiochip_remove(&gc->gchip);
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+ kfree(gc);
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+ sc->gpiochip = NULL;
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+}
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+
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+#else /* CONFIG_GPIOLIB */
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+
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+static inline void ath9k_register_gpio_chip(struct ath_softc *sc)
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+{
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+}
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+
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+static inline void ath9k_unregister_gpio_chip(struct ath_softc *sc)
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+{
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+}
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+
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+#endif /* CONFIG_GPIOLIB */
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/********************************/
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/* LED functions */
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/********************************/
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-#ifdef CPTCFG_MAC80211_LEDS
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-
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static void ath_fill_led_pin(struct ath_softc *sc)
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{
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struct ath_hw *ah = sc->sc_ah;
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@@ -80,6 +206,12 @@ static int ath_add_led(struct ath_softc
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else
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ath9k_hw_set_gpio(sc->sc_ah, gpio->gpio, gpio->active_low);
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+#ifdef CONFIG_GPIOLIB
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+ /* If there is GPIO chip configured, reserve LED pin */
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+ if (sc->gpiochip)
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+ gpio_request(sc->gpiochip->gchip.base + gpio->gpio, gpio->name);
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+#endif
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+
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return 0;
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}
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@@ -136,17 +268,24 @@ void ath_deinit_leds(struct ath_softc *s
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while (!list_empty(&sc->leds)) {
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led = list_first_entry(&sc->leds, struct ath_led, list);
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+#ifdef CONFIG_GPIOLIB
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+ /* If there is GPIO chip configured, free LED pin */
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+ if (sc->gpiochip)
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+ gpio_free(sc->gpiochip->gchip.base + led->gpio->gpio);
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+#endif
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list_del(&led->list);
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ath_led_brightness(&led->cdev, LED_OFF);
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led_classdev_unregister(&led->cdev);
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ath9k_hw_gpio_free(sc->sc_ah, led->gpio->gpio);
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kfree(led);
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}
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+ ath9k_unregister_gpio_chip(sc);
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}
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void ath_init_leds(struct ath_softc *sc)
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{
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struct ath9k_platform_data *pdata = sc->dev->platform_data;
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+ struct device_node *np = sc->dev->of_node;
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char led_name[32];
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const char *trigger;
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int i;
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@@ -156,6 +295,15 @@ void ath_init_leds(struct ath_softc *sc)
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if (AR_SREV_9100(sc->sc_ah))
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return;
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+ if (!np)
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+ ath9k_register_gpio_chip(sc);
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+
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+ /* setup gpio controller only if requested and skip the led_pin setup */
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+ if (of_property_read_bool(np, "gpio-controller")) {
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+ ath9k_register_gpio_chip(sc);
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+ return;
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+ }
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+
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ath_fill_led_pin(sc);
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if (pdata && pdata->leds && pdata->num_leds)
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@@ -180,6 +328,7 @@ void ath_init_leds(struct ath_softc *sc)
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ath_create_gpio_led(sc, sc->sc_ah->led_pin, led_name, trigger,
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!sc->sc_ah->config.led_active_high);
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}
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+
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#endif
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/*******************/
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