[PATCH v2 2/2] backlight: gpio_backlight: add new property default-brightness-level
From: Alexandru Ardelean <hidden>
Date: 2023-06-21 21:55:17
Also in:
dri-devel, linux-devicetree, linux-leds, lkml
Subsystem:
backlight class/subsystem, framebuffer layer, the rest · Maintainers:
Lee Jones, Daniel Thompson, Jingoo Han, Helge Deller, Linus Torvalds
From: Yannick Fertre <yannick.fertre@foss.st.com> Add new property to set a brightness by default at probe. Reviewed-by: Daniel Thompson <redacted> Signed-off-by: Yannick Fertre <yannick.fertre@foss.st.com> Signed-off-by: Alexandru Ardelean <redacted> --- Link to original patch: https://github.com/STMicroelectronics/linux/commit/c4067d7bd883c6fa14ffd49892c4ce663cdafe98 Changelog v1 -> v2: * https://lore.kernel.org/dri-devel/20230519200520.10657-1-alex@shruggie.ro/ (local) * removed 'Reviewed-by: Philippe CORNU [off-list ref]' as requested * patch is now second patch of 2 (was first in series) * added 'Reviewed-by: Daniel Thompson [off-list ref]' drivers/video/backlight/gpio_backlight.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
index 6f78d928f054..d3fa3a8bef4d 100644
--- a/drivers/video/backlight/gpio_backlight.c
+++ b/drivers/video/backlight/gpio_backlight.c@@ -53,6 +53,7 @@ static int gpio_backlight_probe(struct platform_device *pdev) struct backlight_device *bl; struct gpio_backlight *gbl; int ret, init_brightness, def_value; + u32 value; gbl = devm_kzalloc(dev, sizeof(*gbl), GFP_KERNEL); if (gbl == NULL)
@@ -93,7 +94,11 @@ static int gpio_backlight_probe(struct platform_device *pdev) else bl->props.power = FB_BLANK_UNBLANK; - bl->props.brightness = 1; + ret = device_property_read_u32(dev, "default-brightness-level", &value); + if (!ret && value <= props.max_brightness) + bl->props.brightness = value; + else + bl->props.brightness = 1; init_brightness = backlight_get_brightness(bl); ret = gpiod_direction_output(gbl->gpiod, init_brightness);
--
2.40.1