/*
* 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 "nouveau_drm.h"
#include "nouveau_reg.h"
#include "nouveau_encoder.h"
static int
nv40_get_intensity(struct backlight_device *bd)
{
struct nouveau_drm *drm = bl_get_data(bd);
struct nouveau_device *device = nv_device(drm->device);
int val = (nv_rd32(device, NV40_PMC_BACKLIGHT) &
NV40_PMC_BACKLIGHT_MASK) >> 16;
return val;
}
static int
nv40_set_intensity(struct backlight_device *bd)
{
struct nouveau_drm *drm = bl_get_data(bd);
struct nouveau_device *device = nv_device(drm->device);
int val = bd->props.brightness;
int reg = nv_rd32(device, NV40_PMC_BACKLIGHT);
nv_wr32(device, 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
nv40_backlight_init(struct drm_connector *connector)
{
struct nouveau_drm *drm = nouveau_drm(connector->dev);
struct nouveau_device *device = nv_device(drm->device);
struct backlight_properties props;
struct backlight_device *bd;
if (!(nv_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
return 0;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = 31;
bd = backlight_device_register("nv_backlight", &connector->kdev, drm,
&nv40_bl_ops, &props);
drm->backlight = bd;
bd->props.brightness = nv40_get_intensity(bd);
backlight_update_status(bd);
return 0;
}
static int
nv50_get_intensity(struct backlight_device *bd)
{
struct nouveau_encoder *nv_encoder = bl_get_data(bd);
struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
struct nouveau_device *device = nv_device(drm->device);
int or = nv_encoder->or;
u32 div = 1025;
u32 val;
val = nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
val &= NV50_PDISP_SOR_PWM_CTL_VAL;
return ((val * 100) + (div / 2)) / div;
}
static int
nv50_set_intensity(struct backlight_device *bd)
{
struct nouveau_encoder *nv_encoder = bl_get_data(bd);
struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
struct nouveau_device *device = nv_device(drm->device);
int or = nv_encoder->or;
u32 div = 1025;
u32 val = (bd->props.brightness * div) / 100;
nv_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
NV50_PDISP_SOR_PWM_CTL_NEW | val);
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
nva3_get_intensity(struct backlight_device *bd)
{
struct nouveau_encoder *nv_encoder = bl_get_data(bd);
struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
struct nouveau_device *device = nv_device(drm->device);
int or = nv_encoder->or;
u32 div, val;
div = nv_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
val = nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
if (div && div >= val)
return ((val * 100) + (div / 2)) / div;
return 100;
}
static int
nva3_set_intensity(struct backlight_device *bd)
{
struct nouveau_encoder *nv_encoder = bl_get_data(bd);
struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
struct nouveau_device *device = nv_device(drm->device);
int or = nv_encoder->or;
u32 div, val;
div = nv_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
val = (bd->props.brightness * div) / 100;
if (div) {
nv_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val |
NV50_PDISP_SOR_PWM_CTL_NEW |
NVA3_PDISP_SOR_PWM_CTL_UNK);
return 0;
}
return -EINVAL;
}
static const struct backlight_ops nva3_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = nva3_get_intensity,
.update_status = nva3_set_intensity,
};
static int
nv50_backlight_init(struct drm_connector *connector)
{
struct nouveau_drm *drm = nouveau_drm(connector->dev);
struct nouveau_device *device = nv_device(drm->device);
struct nouveau_encoder *nv_encoder;
struct backlight_properties props;
struct backlight_device *bd;
const struct backlight_ops *ops;
nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
if (!nv_encoder) {
nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
if (!nv_encoder)
return -ENODEV;
}
if (!nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(nv_encoder->or)))
return 0;
if (device->chipset <= 0xa0 ||
device->chipset == 0xaa ||
device->chipset == 0xac)
ops = &nv50_bl_ops;
else
ops = &nva3_bl_ops;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = 100;
bd = backlight_device_register("nv_backlight", &connector->kdev,
nv_encoder, ops, &props);
if (IS_ERR(bd))
return PTR_ERR(bd);
drm->backlight = bd;
bd->props.brightness = bd->ops->get_brightness(bd);
backlight_update_status(bd);
return 0;
}
int
nouveau_backlight_init(struct drm_device *dev)
{
struct nouveau_drm *drm = nouveau_drm(dev);
struct nouveau_device *device = nv_device(drm->device);
struct drm_connector *connector;
#ifdef CONFIG_ACPI
if (acpi_video_backlight_support()) {
NV_INFO(drm, "ACPI backlight interface available, "
"not registering our own\n");
return 0;
}
#endif
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
connector->connector_type != DRM_MODE_CONNECTOR_eDP)
continue;
switch (device->card_type) {
case NV_40:
return nv40_backlight_init(connector);
case NV_50:
return nv50_backlight_init(connector);
default:
break;
}
}
return 0;
}
void
nouveau_backlight_exit(struct drm_device *dev)
{
struct nouveau_drm *drm = nouveau_drm(dev);
if (drm->backlight) {
backlight_device_unregister(drm->backlight);
drm->backlight = NULL;
}
}
