backlight.c
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/*
* GMA500 Backlight Interface
*
* Copyright (c) 2009-2011, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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
}