Provide a small convenience wrapper that set/get the
backlight brightness control and creates the backlight
device for the panel interface
Cc: John Stultz <john.stultz@xxxxxxxxxx>
Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Cc: Archit Taneja <archit.taneja@xxxxxxxxx>
Cc: Rob Clark <robdclark@xxxxxxxxx>
Signed-off-by: Vinay Simha BN <simhavcs@xxxxxxxxx>
--
v1:
*tested in nexus7 2nd gen.
---
drivers/gpu/drm/drm_mipi_dsi.c | 63 ++++++++++++++++++++++++++++++++++++++++++
include/drm/drm_mipi_dsi.h | 3 ++
2 files changed, 66 insertions(+)
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 2f0b85c..ac4521e 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -1026,6 +1026,69 @@ int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format)
}
EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);
+static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
+{
+ struct mipi_dsi_device *dsi = bl_get_data(bl);
+ int ret;
+ u8 brightness;
+
+ dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+ ret = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
+ &brightness, sizeof(brightness));
+ if (ret < 0)
+ return ret;
+
+ dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+ return brightness;
+}
+
+static int dsi_dcs_bl_update_status(struct backlight_device *bl)
+{
+ struct mipi_dsi_device *dsi = bl_get_data(bl);
+ int ret;
+ u8 brightness = bl->props.brightness;
+
+ dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+ ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
+ &brightness, sizeof(brightness));
+ if (ret < 0)
+ return ret;
+
+ dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+ return 0;
+}
+
+static const struct backlight_ops dsi_bl_ops = {
+ .update_status = dsi_dcs_bl_update_status,
+ .get_brightness = dsi_dcs_bl_get_brightness,
+};
+
+/**
+ * drm_panel_create_dsi_backlight() - creates the backlight device for the panel
+ * @dsi: DSI peripheral device
+ *
+ * @return a struct backlight on success, or an ERR_PTR on error
+ */
+struct backlight_device
+ *drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
+{
+ struct device *dev = &dsi->dev;
+ struct backlight_properties props;
+
+ memset(&props, 0, sizeof(props));
+ props.type = BACKLIGHT_RAW;
+ props.brightness = 255;
+ props.max_brightness = 255;
+
+ return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+ &dsi_bl_ops, &props);
+}
+EXPORT_SYMBOL(drm_panel_create_dsi_backlight);
+
static int mipi_dsi_drv_probe(struct device *dev)
{
struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 2788dbe..9dd6a97 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -12,6 +12,7 @@
#ifndef __DRM_MIPI_DSI_H__
#define __DRM_MIPI_DSI_H__
+#include <linux/backlight.h>
#include <linux/device.h>
struct mipi_dsi_host;
@@ -269,6 +270,8 @@ int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi);
int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
enum mipi_dsi_dcs_tear_mode mode);
int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format);
+struct backlight_device
+ *drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi);
/**
* struct mipi_dsi_driver - DSI driver
--
1.9.1
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