Register truly panel as a backlight led device and
provide methods to control its backlight operation.
Changes in v2:
- Removed redundant NULL checks
- Arranged headers alphabetically
- Formatting fixes
Signed-off-by: Abhinav Kumar <abhinavk@xxxxxxxxxxxxxx>
---
drivers/gpu/drm/panel/panel-truly-nt35597.c | 91 +++++++++++++++++++++++++++++
1 file changed, 91 insertions(+)
diff --git a/drivers/gpu/drm/panel/panel-truly-nt35597.c b/drivers/gpu/drm/panel/panel-truly-nt35597.c
index 5bd5fdc..ec9f973 100644
--- a/drivers/gpu/drm/panel/panel-truly-nt35597.c
+++ b/drivers/gpu/drm/panel/panel-truly-nt35597.c
@@ -13,6 +13,7 @@
*/
#include <linux/gpio/consumer.h>
+#include <linux/leds.h>
#include <linux/of_graph.h>
#include <linux/regulator/consumer.h>
#include <linux/pinctrl/consumer.h>
@@ -25,6 +26,9 @@
#include <drm/drm_panel.h>
#include <drm/drm_mipi_dsi.h>
+#define BL_NODE_NAME_SIZE 32
+#define PRIM_DISPLAY_NODE 0
+
static const char * const regulator_names[] = {
"vdda",
"vdispp",
@@ -51,6 +55,8 @@ struct truly_wqxga {
struct gpio_desc *mode_gpio;
struct backlight_device *backlight;
+ /* WLED params */
+ struct led_trigger *wled;
struct videomode vm;
struct mipi_dsi_device *dsi[2];
@@ -454,6 +460,82 @@ static void truly_wqxga_panel_del(struct truly_wqxga *ctx)
drm_panel_remove(&ctx->panel);
}
+static void truly_wqxga_bkl_unregister(struct truly_wqxga *ctx)
+{
+ if (ctx->backlight)
+ put_device(&ctx->backlight->dev);
+}
+
+static int truly_backlight_device_update_status(struct backlight_device *bd)
+{
+ int brightness;
+ int max_brightness;
+ int rc = 0;
+ struct truly_wqxga *ctx = dev_get_drvdata(&bd->dev);
+
+ brightness = bd->props.brightness;
+ max_brightness = bd->props.max_brightness;
+
+ if ((bd->props.power != FB_BLANK_UNBLANK) ||
+ (bd->props.state & BL_CORE_FBBLANK) ||
+ (bd->props.state & BL_CORE_SUSPENDED))
+ brightness = 0;
+
+ if (brightness > max_brightness)
+ brightness = max_brightness;
+
+ if (ctx->wled)
+ led_trigger_event(ctx->wled, brightness);
+
+ return rc;
+}
+
+static int truly_backlight_device_get_brightness(struct backlight_device *bd)
+{
+ return bd->props.brightness;
+}
+
+static const struct backlight_ops truly_backlight_device_ops = {
+ .update_status = truly_backlight_device_update_status,
+ .get_brightness = truly_backlight_device_get_brightness,
+};
+
+static int truly_backlight_setup(struct truly_wqxga *ctx)
+{
+ struct backlight_properties props;
+ char bl_node_name[BL_NODE_NAME_SIZE];
+
+ if (!ctx->backlight) {
+ memset(&props, 0, sizeof(props));
+ props.type = BACKLIGHT_RAW;
+ props.power = FB_BLANK_UNBLANK;
+ props.max_brightness = 4096;
+
+ snprintf(bl_node_name, BL_NODE_NAME_SIZE, "panel%u-backlight",
+ PRIM_DISPLAY_NODE);
+
+ ctx->backlight = backlight_device_register(bl_node_name,
+ ctx->dev, ctx,
+ &truly_backlight_device_ops, &props);
+
+ if (IS_ERR_OR_NULL(ctx->backlight)) {
+ pr_err("Failed to register backlight\n");
+ ctx->backlight = NULL;
+ return -ENODEV;
+ }
+
+ /* Register with the LED driver interface */
+ led_trigger_register_simple("bkl-trigger", &ctx->wled);
+
+ if (!ctx->wled) {
+ pr_err("backlight led registration failed\n");
+ return -ENODEV;
+ }
+ }
+
+ return 0;
+}
+
static int truly_wqxga_probe(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
@@ -530,6 +612,12 @@ static int truly_wqxga_probe(struct mipi_dsi_device *dsi)
goto err_panel_add;
}
+ ret = truly_backlight_setup(ctx);
+ if (ret) {
+ dev_err(dev, "backlight setup failed\n");
+ goto err_backlight;
+ }
+
ret = mipi_dsi_attach(dsi);
if (ret < 0) {
dev_err(dev, "master dsi attach failed\n");
@@ -549,6 +637,8 @@ static int truly_wqxga_probe(struct mipi_dsi_device *dsi)
err_dsi_attach_sec:
mipi_dsi_detach(ctx->dsi[0]);
err_dsi_attach:
+ truly_wqxga_bkl_unregister(ctx);
+err_backlight:
truly_wqxga_panel_del(ctx);
err_panel_add:
mipi_dsi_device_unregister(secondary);
@@ -570,6 +660,7 @@ static int truly_wqxga_remove(struct mipi_dsi_device *dsi)
mipi_dsi_detach(ctx->dsi[1]);
mipi_dsi_device_unregister(ctx->dsi[1]);
}
+ truly_wqxga_bkl_unregister(ctx);
truly_wqxga_panel_del(ctx);
kfree(ctx);
}
--
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