[PATCH] backlight: led_bl: Add support for an "enable" GPIO
STALE1797d
From: Corentin LABBE <clabbe@baylibre.com>
Date: 2021-11-02 10:05:36
Also in:
dri-devel, lkml
Subsystem:
backlight class/subsystem, framebuffer layer, the rest · Maintainers:
Lee Jones, Daniel Thompson, Jingoo Han, Helge Deller, Linus Torvalds
From: Jean-Jacques Hiblot <redacted> This patch adds support for an "enable GPIO". Signed-off-by: Jean-Jacques Hiblot <redacted> 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