Re: [PATCH 2/3] drm/panel: ld9040: Register a backlight device

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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;




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