Unverified Commit c2268daa authored by Paul Cercueil's avatar Paul Cercueil
Browse files

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: default avatarPaul Cercueil <paul@crapouillou.net>
Reviewed-by: default avatarSam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230708084027.18352-3-paul@crapouillou.net
parent 50f600fd

drivers/gpu/drm/panel/panel-samsung-ld9040.c

+30 −1
Original line number Diff line number Diff line
@@ -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;