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path: root/drivers/gpu/drm/gma500/backlight.c
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Diffstat (limited to 'drivers/gpu/drm/gma500/backlight.c')
-rw-r--r--drivers/gpu/drm/gma500/backlight.c115
1 files changed, 115 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..577a4987b
--- /dev/null
+++ b/drivers/gpu/drm/gma500/backlight.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * GMA500 Backlight Interface
+ *
+ * Copyright (c) 2009-2011, Intel Corporation.
+ *
+ * Authors: Eric Knopp
+ */
+
+#include <acpi/video.h>
+
+#include "psb_drv.h"
+#include "psb_intel_reg.h"
+#include "psb_intel_drv.h"
+#include "intel_bios.h"
+#include "power.h"
+
+void gma_backlight_enable(struct drm_device *dev)
+{
+ struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+
+ dev_priv->backlight_enabled = true;
+ dev_priv->ops->backlight_set(dev, dev_priv->backlight_level);
+}
+
+void gma_backlight_disable(struct drm_device *dev)
+{
+ struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+
+ dev_priv->backlight_enabled = false;
+ dev_priv->ops->backlight_set(dev, 0);
+}
+
+void gma_backlight_set(struct drm_device *dev, int v)
+{
+ struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+
+ dev_priv->backlight_level = v;
+ if (dev_priv->backlight_enabled)
+ dev_priv->ops->backlight_set(dev, v);
+}
+
+static int gma_backlight_get_brightness(struct backlight_device *bd)
+{
+ struct drm_device *dev = bl_get_data(bd);
+ struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+
+ if (dev_priv->ops->backlight_get)
+ return dev_priv->ops->backlight_get(dev);
+
+ return dev_priv->backlight_level;
+}
+
+static int gma_backlight_update_status(struct backlight_device *bd)
+{
+ struct drm_device *dev = bl_get_data(bd);
+ int level = backlight_get_brightness(bd);
+
+ /* Percentage 1-100% being valid */
+ if (level < 1)
+ level = 1;
+
+ gma_backlight_set(dev, level);
+ return 0;
+}
+
+static const struct backlight_ops gma_backlight_ops __maybe_unused = {
+ .get_brightness = gma_backlight_get_brightness,
+ .update_status = gma_backlight_update_status,
+};
+
+int gma_backlight_init(struct drm_device *dev)
+{
+ struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+ struct backlight_properties props __maybe_unused = {};
+ int ret;
+
+ dev_priv->backlight_enabled = true;
+ dev_priv->backlight_level = 100;
+
+ ret = dev_priv->ops->backlight_init(dev);
+ if (ret)
+ return ret;
+
+ if (!acpi_video_backlight_use_native()) {
+ drm_info(dev, "Skipping %s backlight registration\n",
+ dev_priv->ops->backlight_name);
+ return 0;
+ }
+
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+ props.brightness = dev_priv->backlight_level;
+ props.max_brightness = PSB_MAX_BRIGHTNESS;
+ props.type = BACKLIGHT_RAW;
+
+ dev_priv->backlight_device =
+ backlight_device_register(dev_priv->ops->backlight_name,
+ dev->dev, dev,
+ &gma_backlight_ops, &props);
+ if (IS_ERR(dev_priv->backlight_device))
+ return PTR_ERR(dev_priv->backlight_device);
+#endif
+
+ return 0;
+}
+
+void gma_backlight_exit(struct drm_device *dev)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+ struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+
+ if (dev_priv->backlight_device)
+ backlight_device_unregister(dev_priv->backlight_device);
+#endif
+}