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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-02-25 GuEe-GUI the first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "video.backlight.rpi"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include <firmware-raspberrypi.h>
struct rpi_backlight
{
struct rt_backlight_device parent;
struct rpi_firmware *rpi_fw;
};
#define raw_to_rpi_backlight(raw) rt_container_of(raw, struct rpi_backlight, parent)
static rt_err_t rpi_backlight_update_status(struct rt_backlight_device *bl)
{
rt_err_t err;
struct rpi_backlight *rbl = raw_to_rpi_backlight(bl);
rt_uint32_t brightness = bl->props.brightness;
if (bl->props.power != RT_BACKLIGHT_POWER_UNBLANK)
{
brightness = 0;
}
err = rpi_firmware_property(rbl->rpi_fw,
RPI_FIRMWARE_FRAMEBUFFER_SET_BACKLIGHT, &brightness, sizeof(brightness));
if (err)
{
LOG_E("Failed to set brightness");
return err;
}
if ((int)brightness < 0)
{
LOG_E("Backlight change failed");
return -RT_ERROR;
}
return RT_EOK;
}
static struct rt_backlight_ops rpi_backlight_ops =
{
.update_status = rpi_backlight_update_status,
};
static rt_err_t rpi_backlight_probe(struct rt_platform_device *pdev)
{
rt_err_t err = RT_EOK;
struct rpi_firmware *rpi_fw;
struct rt_device *dev = &pdev->parent;
struct rt_ofw_node *np = dev->ofw_node, *fw_np;
struct rpi_backlight *rbl = rt_calloc(1, sizeof(*rbl));
if (!rbl)
{
return -RT_ENOMEM;
}
fw_np = rt_ofw_parse_phandle(np, "firmware", 0);
if (!fw_np)
{
err = -RT_EINVAL;
goto _fail;
}
rpi_fw = rpi_firmware_get(fw_np);
rt_ofw_node_put(fw_np);
if (!rpi_fw)
{
err = -RT_EINVAL;
goto _fail;
}
dev->user_data = rbl;
rbl->rpi_fw = rpi_fw;
rbl->parent.props.max_brightness = 255;
rbl->parent.ops = &rpi_backlight_ops;
if ((err = rt_backlight_register(&rbl->parent)))
{
goto _fail;
}
rt_backlight_set_brightness(&rbl->parent, 255);
return RT_EOK;
_fail:
if (rbl->rpi_fw)
{
rpi_firmware_put(rbl->rpi_fw);
}
rt_free(rbl);
return err;
}
static rt_err_t rpi_backlight_remove(struct rt_platform_device *pdev)
{
struct rpi_backlight *rbl = pdev->parent.user_data;
rt_backlight_unregister(&rbl->parent);
rpi_firmware_put(rbl->rpi_fw);
rt_free(rbl);
return RT_EOK;
}
static const struct rt_ofw_node_id rpi_backlight_ofw_ids[] =
{
{ .compatible = "raspberrypi,rpi-backlight" },
{ /* sentinel */ }
};
static struct rt_platform_driver rpi_backlight_driver =
{
.name = "rpi-backlight",
.ids = rpi_backlight_ofw_ids,
.probe = rpi_backlight_probe,
.remove = rpi_backlight_remove,
};
RT_PLATFORM_DRIVER_EXPORT(rpi_backlight_driver);
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