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// SPDX-License-Identifier: GPL-2.0+
/*
* shmob_drm_backlight.c -- SH Mobile DRM Backlight
*
* Copyright (C) 2012 Renesas Electronics Corporation
*
* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*/
#include <linux/backlight.h>
#include "shmob_drm_backlight.h"
#include "shmob_drm_crtc.h"
#include "shmob_drm_drv.h"
static int shmob_drm_backlight_update(struct backlight_device *bdev)
{
struct shmob_drm_connector *scon = bl_get_data(bdev);
struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
int brightness = bdev->props.brightness;
if (bdev->props.power != FB_BLANK_UNBLANK ||
bdev->props.state & BL_CORE_SUSPENDED)
brightness = 0;
return bdata->set_brightness(brightness);
}
static int shmob_drm_backlight_get_brightness(struct backlight_device *bdev)
{
struct shmob_drm_connector *scon = bl_get_data(bdev);
struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
return bdata->get_brightness();
}
static const struct backlight_ops shmob_drm_backlight_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = shmob_drm_backlight_update,
.get_brightness = shmob_drm_backlight_get_brightness,
};
void shmob_drm_backlight_dpms(struct shmob_drm_connector *scon, int mode)
{
if (scon->backlight == NULL)
return;
scon->backlight->props.power = mode == DRM_MODE_DPMS_ON
? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
backlight_update_status(scon->backlight);
}
int shmob_drm_backlight_init(struct shmob_drm_connector *scon)
{
struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
struct drm_connector *connector = &scon->connector;
struct drm_device *dev = connector->dev;
struct backlight_device *backlight;
if (!bdata->max_brightness)
return 0;
backlight = backlight_device_register(bdata->name, dev->dev, scon,
&shmob_drm_backlight_ops, NULL);
if (IS_ERR(backlight)) {
dev_err(dev->dev, "unable to register backlight device: %ld\n",
PTR_ERR(backlight));
return PTR_ERR(backlight);
}
backlight->props.max_brightness = bdata->max_brightness;
backlight->props.brightness = bdata->max_brightness;
backlight->props.power = FB_BLANK_POWERDOWN;
backlight_update_status(backlight);
scon->backlight = backlight;
return 0;
}
void shmob_drm_backlight_exit(struct shmob_drm_connector *scon)
{
backlight_device_unregister(scon->backlight);
}
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