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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 <rtthread.h>
#define DBG_TAG "rtdm.backlight"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include <stdlib.h>
#include <drivers/core/dm.h>
#include <drivers/backlight.h>
static struct rt_dm_ida backlight_ida = RT_DM_IDA_INIT(GRAPHIC_BACKLIGHT);
static rt_ssize_t _backlight_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
{
rt_ssize_t res;
int brightness_len;
rt_uint32_t brightness;
char string[sizeof("4294967295")];
struct rt_backlight_device *bl = rt_container_of(dev, struct rt_backlight_device, parent);
if ((res = rt_backlight_get_brightness(bl, &brightness)))
{
return res;
}
brightness_len = rt_sprintf(string, "%u", brightness);
if (pos < brightness_len)
{
size = rt_min_t(rt_size_t, size, brightness_len - pos);
rt_strncpy(buffer, &string[pos], size);
return size;
}
else
{
return 0;
}
}
static rt_ssize_t _backlight_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
{
rt_ssize_t res;
rt_uint32_t brightness = atoi(buffer);
struct rt_backlight_device *bl = rt_container_of(dev, struct rt_backlight_device, parent);
if (brightness > bl->props.max_brightness)
{
LOG_D("%s: brightness(%u) > max_brightness(%u)",
rt_dm_dev_get_name(dev), brightness, bl->props.max_brightness);
return -RT_EINVAL;
}
if ((res = rt_backlight_set_brightness(bl, brightness)))
{
return res;
}
LOG_D("%s: brightness to %u", rt_dm_dev_get_name(dev), brightness);
return size;
}
#ifdef RT_USING_DEVICE_OPS
const static struct rt_device_ops _backlight_ops =
{
.read = _backlight_read,
.write = _backlight_write,
};
#endif
rt_err_t rt_backlight_register(struct rt_backlight_device *bl)
{
rt_err_t err;
int device_id;
const char *dev_name;
if (!bl || !bl->ops)
{
return -RT_EINVAL;
}
if ((device_id = rt_dm_ida_alloc(&backlight_ida)) < 0)
{
return -RT_EFULL;
}
rt_dm_dev_set_name(&bl->parent, "backlight%u", device_id);
dev_name = rt_dm_dev_get_name(&bl->parent);
rt_mutex_init(&bl->lock, dev_name, RT_IPC_FLAG_PRIO);
bl->parent.type = RT_Device_Class_Char;
#ifdef RT_USING_DEVICE_OPS
bl->parent.ops = &_backlight_ops;
#else
bl->parent.read = _backlight_read;
bl->parent.write = _backlight_write;
#endif
bl->parent.master_id = backlight_ida.master_id;
bl->parent.device_id = device_id;
if ((err = rt_device_register(&bl->parent, dev_name, RT_DEVICE_FLAG_RDWR)))
{
rt_dm_ida_free(&backlight_ida, device_id);
return err;
}
return RT_EOK;
}
rt_err_t rt_backlight_unregister(struct rt_backlight_device *bl)
{
if (!bl)
{
return -RT_EINVAL;
}
rt_backlight_set_power(bl, RT_BACKLIGHT_POWER_POWERDOWN);
rt_dm_ida_free(&backlight_ida, bl->parent.device_id);
rt_device_unregister(&bl->parent);
return RT_EOK;
}
rt_err_t rt_backlight_set_power(struct rt_backlight_device *bl, enum rt_backlight_power power)
{
rt_err_t err;
enum rt_backlight_power old_power;
if (!bl || power >= RT_BACKLIGHT_POWER_NR)
{
return -RT_EINVAL;
}
rt_mutex_take(&bl->lock, RT_WAITING_FOREVER);
old_power = bl->props.power;
bl->props.power = power;
if ((err = bl->ops->update_status(bl)))
{
bl->props.power = old_power;
}
rt_mutex_release(&bl->lock);
return err;
}
rt_err_t rt_backlight_get_power(struct rt_backlight_device *bl, enum rt_backlight_power *out_power)
{
if (!bl || !out_power)
{
return -RT_EINVAL;
}
rt_mutex_take(&bl->lock, RT_WAITING_FOREVER);
*out_power = bl->props.power;
rt_mutex_release(&bl->lock);
return RT_EOK;
}
rt_err_t rt_backlight_set_brightness(struct rt_backlight_device *bl, rt_uint32_t brightness)
{
rt_err_t err;
rt_uint32_t old_brightness;
if (!bl || brightness > bl->props.max_brightness)
{
return -RT_EINVAL;
}
rt_mutex_take(&bl->lock, RT_WAITING_FOREVER);
old_brightness = bl->props.brightness;
bl->props.brightness = brightness;
if ((err = bl->ops->update_status(bl)))
{
bl->props.brightness = old_brightness;
}
rt_mutex_release(&bl->lock);
return err;
}
rt_err_t rt_backlight_get_brightness(struct rt_backlight_device *bl, rt_uint32_t *out_brightness)
{
rt_err_t err;
if (!bl || !out_brightness)
{
return -RT_EINVAL;
}
rt_mutex_take(&bl->lock, RT_WAITING_FOREVER);
if (bl->ops->get_brightness)
{
err = bl->ops->get_brightness(bl, out_brightness);
}
else
{
*out_brightness = rt_backlight_power_brightness(bl);
err = RT_EOK;
}
rt_mutex_release(&bl->lock);
return err;
}
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