drm/panel: ld9040: Register a backlight device

Register a backlight device to be able to switch between all the gamma
levels.

v2: Remove .get_brightness() callback, use bl_get_data() and
    backlight_get_brightness()

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230708084027.18352-3-paul@crapouillou.net

diff --git a/drivers/gpu/drm/panel/panel-samsung-ld9040.c b/drivers/gpu/drm/panel/panel-samsung-ld9040.c
index f39f999c21afc57b1c6ee55b1bb1521bbc5bfb2e..9f438683a6f6e872317af879d1d9518551b08987 100644 (file)
--- 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@samsung.com>
 */
 
+#include <linux/backlight.h>
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
@@ -310,8 +311,30 @@ static int ld9040_parse_dt(struct ld9040 *ctx)
        return 0;
 }
 
+static int ld9040_bl_update_status(struct backlight_device *dev)
+{
+       struct ld9040 *ctx = bl_get_data(dev);
+
+       ctx->brightness = backlight_get_brightness(dev);
+       ld9040_brightness_set(ctx);
+
+       return 0;
+}
+
+static const struct backlight_ops ld9040_bl_ops = {
+       .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;
@@ -323,7 +346,7 @@ static int ld9040_probe(struct spi_device *spi)
        spi_set_drvdata(spi, ctx);
 
        ctx->dev = dev;
-       ctx->brightness = ARRAY_SIZE(ld9040_gammas) - 1;
+       ctx->brightness = ld9040_bl_props.brightness;
 
        ret = ld9040_parse_dt(ctx);
        if (ret < 0)
@@ -353,6 +376,12 @@ 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;