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// SPDX-License-Identifier: GPL-2.0-only
/*
* GMA500 Backlight Interface
*
* Copyright (c) 2009-2011, Intel Corporation.
*
* Authors: Eric Knopp
*/
#include <linux/backlight.h>
#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
}
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