1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/gpu/drm/gma500/backlight.c b/drivers/gpu/drm/gma500/backlight.c
new file mode 100644
index 000000000..35600d070
--- /dev/null
+++ b/drivers/gpu/drm/gma500/backlight.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * GMA500 Backlight Interface
+ *
+ * Copyright (c) 2009-2011, Intel Corporation.
+ *
+ * Authors: Eric Knopp
+ */
+
+#include "psb_drv.h"
+#include "psb_intel_reg.h"
+#include "psb_intel_drv.h"
+#include "intel_bios.h"
+#include "power.h"
+
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+static void do_gma_backlight_set(struct drm_device *dev)
+{
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	backlight_update_status(dev_priv->backlight_device);
+}
+#endif
+
+void gma_backlight_enable(struct drm_device *dev)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	dev_priv->backlight_enabled = true;
+	if (dev_priv->backlight_device) {
+		dev_priv->backlight_device->props.brightness = dev_priv->backlight_level;
+		do_gma_backlight_set(dev);
+	}
+#endif	
+}
+
+void gma_backlight_disable(struct drm_device *dev)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	dev_priv->backlight_enabled = false;
+	if (dev_priv->backlight_device) {
+		dev_priv->backlight_device->props.brightness = 0;
+		do_gma_backlight_set(dev);
+	}
+#endif	
+}
+
+void gma_backlight_set(struct drm_device *dev, int v)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	dev_priv->backlight_level = v;
+	if (dev_priv->backlight_device && dev_priv->backlight_enabled) {
+		dev_priv->backlight_device->props.brightness = v;
+		do_gma_backlight_set(dev);
+	}
+#endif	
+}
+
+int gma_backlight_init(struct drm_device *dev)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	dev_priv->backlight_enabled = true;
+	return dev_priv->ops->backlight_init(dev);
+#else
+	return 0;
+#endif
+}
+
+void gma_backlight_exit(struct drm_device *dev)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	if (dev_priv->backlight_device) {
+		dev_priv->backlight_device->props.brightness = 0;
+		backlight_update_status(dev_priv->backlight_device);
+		backlight_device_unregister(dev_priv->backlight_device);
+	}
+#endif
+}