The patch adds backlight support to s6e8aa0 panel.
Signed-off-by: Andrzej Hajda a.hajda@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; }