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Openwrt/package/kernel/mac80211/patches/ath9k/548-ath9k_enable_gpio_chip.patch
Ansuel Smith 3394af677c mac80211: split ath patch in dedicated subdir 
The ath patch number is already large and adding other patch for ath11k
will add more confusion with the patch numbering.
Since the support of ath11k based device is imminent, prepare the mac80211
ath patch dir and split it in the dedicated ath5k, ath9k, ath10k and ath11k
(empty for now).

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
2021-06-04 22:44:40 +02:00

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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
@@ -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"
@@ -990,6 +991,14 @@ 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;
@@ -1045,6 +1054,9 @@ 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 +16,139 @@
#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_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));
+#ifdef CONFIG_OF
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,5,0)
+ gc->gchip.parent = sc->dev;
+#else
+ gc->gchip.dev = sc->dev;
+#endif
+#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;
+ }
+
+#ifdef CONFIG_OF
+ gc->gchip.owner = NULL;
+#endif
+ 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 +206,12 @@ 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 +268,24 @@ 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 +295,15 @@ 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 +328,7 @@ 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
/*******************/
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