The patch adds backlight support to s6e8aa0 panel.
Signed-off-by: Andrzej Hajda <a.ha...@samsung.com>
---
drivers/gpu/drm/panel/Kconfig | 2 ++
drivers/gpu/drm/panel/panel-s6e8aa0.c | 50 +++++++++++++++++++++++++++++++++++
2 files changed, 52 insertions(+)
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 4ec874d..a54d89b 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -29,5 +29,7 @@ config DRM_PANEL_S6E8AA0
depends on OF
select DRM_MIPI_DSI
select VIDEOMODE_HELPERS
+ select BACKLIGHT_LCD_SUPPORT
+ select BACKLIGHT_CLASS_DEVICE
endmenu
diff --git a/drivers/gpu/drm/panel/panel-s6e8aa0.c
b/drivers/gpu/drm/panel/panel-s6e8aa0.c
index 35941d2..98a59a7 100644
--- a/drivers/gpu/drm/panel/panel-s6e8aa0.c
+++ b/drivers/gpu/drm/panel/panel-s6e8aa0.c
@@ -19,6 +19,7 @@
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_panel.h>
+#include <linux/backlight.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
@@ -91,6 +92,8 @@ struct s6e8aa0_variant {
const s6e8aa0_gamma_table *gamma_tables;
};
+#define S6E8AA0_STATE_BIT_ENABLED 0
+
struct s6e8aa0 {
struct device *dev;
struct drm_panel panel;
@@ -106,6 +109,7 @@ struct s6e8aa0 {
u32 width_mm;
u32 height_mm;
+ unsigned long state;
u8 version;
u8 id;
const struct s6e8aa0_variant *variant;
@@ -890,6 +894,7 @@ static int s6e8aa0_disable(struct drm_panel *panel)
{
struct s6e8aa0 *ctx = panel_to_s6e8aa0(panel);
+ clear_bit(S6E8AA0_STATE_BIT_ENABLED, &ctx->state);
s6e8aa0_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
s6e8aa0_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_OFF);
msleep(40);
@@ -913,6 +918,8 @@ static int s6e8aa0_enable(struct drm_panel *panel)
if (ret < 0)
s6e8aa0_disable(panel);
+ else
+ set_bit(S6E8AA0_STATE_BIT_ENABLED, &ctx->state);
return ret;
}
@@ -947,6 +954,47 @@ static const struct drm_panel_funcs s6e8aa0_drm_funcs = {
.get_modes = s6e8aa0_get_modes,
};
+static int s6e8aa0_get_brightness(struct backlight_device *bd)
+{
+ return bd->props.brightness;
+}
+
+static int s6e8aa0_set_brightness(struct backlight_device *bd)
+{
+ struct s6e8aa0 *ctx = bl_get_data(bd);
+
+ bd->props.power = FB_BLANK_UNBLANK;
+ if (ctx->brightness != bd->props.brightness) {
+ ctx->brightness = bd->props.brightness;
+ if (test_bit(S6E8AA0_STATE_BIT_ENABLED, &ctx->state))
+ s6e8aa0_brightness_set(ctx);
+ }
+
+ return s6e8aa0_clear_error(ctx);
+}
+
+static const struct backlight_ops s6e8aa0_backlight_ops = {
+ .get_brightness = s6e8aa0_get_brightness,
+ .update_status = s6e8aa0_set_brightness,
+};
+
+static void s6e8aa0_backlight_register(struct s6e8aa0 *ctx)
+{
+ struct backlight_properties props = {
+ .type = BACKLIGHT_RAW,
+ .brightness = ctx->brightness,
+ .max_brightness = GAMMA_LEVEL_NUM - 1
+ };
+ struct device *dev = ctx->dev;
+ struct backlight_device *bd;
+
+ bd = devm_backlight_device_register(dev, "s6e8aa0-bl", dev, ctx,
+ &s6e8aa0_backlight_ops, &props);
+ if (IS_ERR(bd))
+ dev_err(dev, "error registering backlight device (%ld)\n",
+ PTR_ERR(bd));
+}
+
static int s6e8aa0_parse_dt(struct s6e8aa0 *ctx)
{
struct device *dev = ctx->dev;
@@ -1029,6 +1077,8 @@ static int s6e8aa0_probe(struct mipi_dsi_device *dsi)
if (ret < 0)
drm_panel_remove(&ctx->panel);
+ s6e8aa0_backlight_register(ctx);
+
return ret;
}
--
1.9.1
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