On 03/07/2023 23:47, Paul Cercueil wrote:
Register a backlight device to be able to switch between all the gamma
levels.
Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/panel/panel-samsung-ld9040.c | 40 ++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/gpu/drm/panel/panel-samsung-ld9040.c b/drivers/gpu/drm/panel/panel-samsung-ld9040.c
index 7fd9444b42c5..b4f87d6244cb 100644
--- a/drivers/gpu/drm/panel/panel-samsung-ld9040.c
+++ b/drivers/gpu/drm/panel/panel-samsung-ld9040.c
@@ -8,6 +8,7 @@
* Andrzej Hajda <a.hajda@xxxxxxxxxxx>
*/
+#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
@@ -311,8 +312,40 @@ static int ld9040_parse_dt(struct ld9040 *ctx)
return 0;
}
+static int ld9040_bl_update_status(struct backlight_device *dev)
+{
+ struct ld9040 *ctx = dev_get_drvdata(&dev->dev);
+
+ ctx->brightness = dev->props.brightness;
+ ld9040_brightness_set(ctx);
+
+ return 0;
+}
+
+static int ld9040_bl_get_intensity(struct backlight_device *dev)
+{
+ if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
+ dev->props.power == FB_BLANK_UNBLANK)
+ return dev->props.brightness;
+
+ return 0;
+}
You can totally drop the _get_brightness.
Neil
+
+static const struct backlight_ops ld9040_bl_ops = {
+ .get_brightness = ld9040_bl_get_intensity,
+ .update_status = ld9040_bl_update_status,
+};
+
+static const struct backlight_properties ld9040_bl_props = {
+ .type = BACKLIGHT_RAW,
+ .scale = BACKLIGHT_SCALE_NON_LINEAR,
+ .max_brightness = ARRAY_SIZE(ld9040_gammas) - 1,
+ .brightness = ARRAY_SIZE(ld9040_gammas) - 1,
+};
+
static int ld9040_probe(struct spi_device *spi)
{
+ struct backlight_device *bldev;
struct device *dev = &spi->dev;
struct ld9040 *ctx;
int ret;
@@ -354,6 +387,13 @@ static int ld9040_probe(struct spi_device *spi)
drm_panel_init(&ctx->panel, dev, &ld9040_drm_funcs,
DRM_MODE_CONNECTOR_DPI);
+
+ bldev = devm_backlight_device_register(dev, dev_name(dev), dev,
+ ctx, &ld9040_bl_ops,
+ &ld9040_bl_props);
+ if (IS_ERR(bldev))
+ return PTR_ERR(bldev);
+
drm_panel_add(&ctx->panel);
return 0;
