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drm/panel: ld9040: Register a backlight device

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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
This commit is contained in:
Paul Cercueil 2023-07-08 10:40:26 +02:00
parent 50f600fd6b
commit c2268daa65
No known key found for this signature in database
GPG Key ID: 73EE6BD2274ABD41
1 changed files with 30 additions and 1 deletions
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31
drivers/gpu/drm/panel/panel-samsung-ld9040.c
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@ -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;