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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-3-08 GuEe-GUI the first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "led.syscon"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
struct syscon_led
{
struct rt_led_device parent;
struct rt_syscon *map;
rt_uint32_t offset;
rt_uint32_t mask;
};
#define raw_to_syscon_led(raw) rt_container_of(raw, struct syscon_led, parent)
static rt_err_t syscon_led_set_state(struct rt_led_device *led, enum rt_led_state state)
{
rt_err_t err = RT_EOK;
struct syscon_led *sled = raw_to_syscon_led(led);
switch (state)
{
case RT_LED_S_OFF:
err = rt_syscon_update_bits(sled->map, sled->offset, sled->mask, 0);
break;
case RT_LED_S_ON:
err = rt_syscon_update_bits(sled->map, sled->offset, sled->mask, sled->mask);
break;
case RT_LED_S_TOGGLE:
err = led->ops->get_state(led, &state);
if (!err)
{
err = led->ops->set_state(led, state == RT_LED_S_OFF ? RT_LED_S_ON : RT_LED_S_OFF);
}
break;
default:
return -RT_ENOSYS;
}
return err;
}
static rt_err_t syscon_led_get_state(struct rt_led_device *led, enum rt_led_state *out_state)
{
rt_err_t err;
rt_uint32_t val;
struct syscon_led *sled = raw_to_syscon_led(led);
if (!(err = rt_syscon_read(sled->map, sled->offset, &val)))
{
if ((val & ~sled->mask))
{
*out_state = RT_LED_S_ON;
}
else
{
*out_state = RT_LED_S_OFF;
}
}
return err;
}
const static struct rt_led_ops syscon_led_ops =
{
.set_state = syscon_led_set_state,
.get_state = syscon_led_get_state,
};
static rt_err_t syscon_led_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
const char *propname, *state, *trigger;
enum rt_led_state led_state = RT_LED_S_OFF;
struct rt_ofw_node *np = pdev->parent.ofw_node, *pnp;
struct syscon_led *sled = rt_calloc(1, sizeof(*sled));
if (!sled)
{
return -RT_ENOMEM;
}
if (!(pnp = rt_ofw_get_parent(np)))
{
err = -RT_EINVAL;
goto _fail;
}
if ((err = rt_ofw_prop_read_u32(np, "offset", &sled->offset)) ||
(err = rt_ofw_prop_read_u32(np, "mask", &sled->mask)))
{
rt_ofw_node_put(pnp);
goto _fail;
}
sled->map = rt_syscon_find_by_ofw_node(pnp);
rt_ofw_node_put(pnp);
if (!sled->map)
{
err = -RT_EINVAL;
goto _fail;
}
pdev->parent.user_data = sled;
sled->parent.ops = &syscon_led_ops;
if ((err = rt_led_register(&sled->parent)))
{
goto _fail;
}
if (!rt_ofw_prop_read_string(np, "default-state", &state))
{
if (!rt_strcmp(state, "on"))
{
led_state = RT_LED_S_ON;
}
}
if ((propname = rt_ofw_get_prop_fuzzy_name(np, "default-trigger$")))
{
if (!rt_ofw_prop_read_string(np, propname, &trigger))
{
if (!rt_strcmp(trigger, "heartbeat") ||
!rt_strcmp(trigger, "timer"))
{
led_state = RT_LED_S_BLINK;
}
}
}
rt_led_set_state(&sled->parent, led_state);
return RT_EOK;
_fail:
rt_free(sled);
return err;
}
static rt_err_t syscon_led_remove(struct rt_platform_device *pdev)
{
struct syscon_led *sled = pdev->parent.user_data;
rt_led_unregister(&sled->parent);
rt_free(sled);
return RT_EOK;
}
static const struct rt_ofw_node_id syscon_led_ofw_ids[] =
{
{ .compatible = "register-bit-led" },
{ /* sentinel */ }
};
static struct rt_platform_driver syscon_led_driver =
{
.name = "leds-syscon",
.ids = syscon_led_ofw_ids,
.probe = syscon_led_probe,
.remove = syscon_led_remove,
};
RT_PLATFORM_DRIVER_EXPORT(syscon_led_driver);
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