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/*
* Copyright (C) 2009 Red Hat <mjg@redhat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
/*
* Authors:
* Matthew Garrett <mjg@redhat.com>
*
* Register locations derived from NVClock by Roderick Colenbrander
*/
#include <linux/backlight.h>
#include <linux/acpi.h>
#include "drmP.h"
#include "nouveau_drv.h"
#include "nouveau_drm.h"
#include "nouveau_reg.h"
static int nv40_get_intensity(struct backlight_device *bd)
{
struct drm_device *dev = bl_get_data(bd);
int val = (nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)
>> 16;
return val;
}
static int nv40_set_intensity(struct backlight_device *bd)
{
struct drm_device *dev = bl_get_data(bd);
int val = bd->props.brightness;
int reg = nv_rd32(dev, NV40_PMC_BACKLIGHT);
nv_wr32(dev, NV40_PMC_BACKLIGHT,
(val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
return 0;
}
static const struct backlight_ops nv40_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = nv40_get_intensity,
.update_status = nv40_set_intensity,
};
static int nv50_get_intensity(struct backlight_device *bd)
{
struct drm_device *dev = bl_get_data(bd);
return nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT);
}
static int nv50_set_intensity(struct backlight_device *bd)
{
struct drm_device *dev = bl_get_data(bd);
int val = bd->props.brightness;
nv_wr32(dev, NV50_PDISPLAY_SOR_BACKLIGHT,
val | NV50_PDISPLAY_SOR_BACKLIGHT_ENABLE);
return 0;
}
static const struct backlight_ops nv50_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = nv50_get_intensity,
.update_status = nv50_set_intensity,
};
static int nouveau_nv40_backlight_init(struct drm_device *dev)
{
struct backlight_properties props;
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct backlight_device *bd;
if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
return 0;
memset(&props, 0, sizeof(struct backlight_properties));
props.max_brightness = 31;
bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
&nv40_bl_ops, &props);
if (IS_ERR(bd))
return PTR_ERR(bd);
dev_priv->backlight = bd;
bd->props.brightness = nv40_get_intensity(bd);
backlight_update_status(bd);
return 0;
}
static int nouveau_nv50_backlight_init(struct drm_device *dev)
{
struct backlight_properties props;
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct backlight_device *bd;
if (!nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT))
return 0;
memset(&props, 0, sizeof(struct backlight_properties));
props.max_brightness = 1025;
bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
&nv50_bl_ops, &props);
if (IS_ERR(bd))
return PTR_ERR(bd);
dev_priv->backlight = bd;
bd->props.brightness = nv50_get_intensity(bd);
backlight_update_status(bd);
return 0;
}
int nouveau_backlight_init(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
#ifdef CONFIG_ACPI
if (acpi_video_backlight_support()) {
NV_INFO(dev, "ACPI backlight interface available, "
"not registering our own\n");
return 0;
}
#endif
switch (dev_priv->card_type) {
case NV_40:
return nouveau_nv40_backlight_init(dev);
case NV_50:
return nouveau_nv50_backlight_init(dev);
default:
break;
}
return 0;
}
void nouveau_backlight_exit(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
if (dev_priv->backlight) {
backlight_device_unregister(dev_priv->backlight);
dev_priv->backlight = NULL;
}
}
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