[PATCH] backlight: led_bl: Add support for an "enable" GPIO

Corentin LABBE
2021-11-02T10:05:36Z

From: Jean-Jacques Hiblot <jjhiblot@ti.com>

This patch adds support for an "enable GPIO".

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Signed-off-by: Corentin LABBE <clabbe@baylibre.com>
---
drivers/video/backlight/led_bl.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
index f54d256e2d54..ebd7acc32980 100644
--- a/drivers/video/backlight/led_bl.c
+++ b/drivers/video/backlight/led_bl.c
@@ -8,6 +8,7 @@

#include <linux/backlight.h>
#include <linux/leds.h>
+#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/platform_device.h>

@@ -15,6 +16,7 @@ struct led_bl_data {
struct device *dev;
struct backlight_device *bl_dev;
struct led_classdev **leds;
+ struct gpio_desc *enable_gpio;
bool enabled;
int nb_leds;
unsigned int *levels;
@@ -35,6 +37,9 @@ static void led_bl_set_brightness(struct led_bl_data *priv, int level)
for (i = 0; i < priv->nb_leds; i++)
led_set_brightness(priv->leds[i], bkl_brightness);

+ if (!priv->enabled)
+ gpiod_set_value_cansleep(priv->enable_gpio, 1);
+
priv->enabled = true;
}

@@ -48,6 +53,9 @@ static void led_bl_power_off(struct led_bl_data *priv)
for (i = 0; i < priv->nb_leds; i++)
led_set_brightness(priv->leds[i], LED_OFF);

+ if (priv->enabled)
+ gpiod_set_value_cansleep(priv->enable_gpio, 0);
+
priv->enabled = false;
}

@@ -209,6 +217,11 @@ static int led_bl_probe(struct platform_device *pdev)
return PTR_ERR(priv->bl_dev);
}

+ priv->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(priv->enable_gpio))
+ return PTR_ERR(priv->enable_gpio);
+
for (i = 0; i < priv->nb_leds; i++)
led_sysfs_disable(priv->leds[i]);

--
2.25.1