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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.gpio"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
struct gpio_led
{
struct rt_led_device parent;
rt_base_t pin;
rt_uint8_t active_val;
};
#define raw_to_gpio_led(raw) rt_container_of(raw, struct gpio_led, parent)
static rt_err_t gpio_led_set_state(struct rt_led_device *led, enum rt_led_state state)
{
rt_err_t err = RT_EOK;
struct gpio_led *gled = raw_to_gpio_led(led);
rt_pin_mode(gled->pin, PIN_MODE_OUTPUT);
switch (state)
{
case RT_LED_S_OFF:
rt_pin_write(gled->pin, !gled->active_val);
break;
case RT_LED_S_ON:
rt_pin_write(gled->pin, gled->active_val);
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 gpio_led_get_state(struct rt_led_device *led, enum rt_led_state *out_state)
{
struct gpio_led *gled = raw_to_gpio_led(led);
switch (rt_pin_read(gled->pin))
{
case PIN_LOW:
*out_state = RT_LED_S_OFF;
break;
case PIN_HIGH:
*out_state = RT_LED_S_ON;
break;
default:
return -RT_ERROR;
}
return RT_EOK;
}
const static struct rt_led_ops gpio_led_ops =
{
.set_state = gpio_led_set_state,
.get_state = gpio_led_get_state,
};
static rt_err_t ofw_append_gpio_led(struct rt_ofw_node *np)
{
rt_err_t err;
enum rt_led_state led_state = RT_LED_S_OFF;
const char *propname, *state, *trigger;
struct gpio_led *gled = rt_malloc(sizeof(*gled));
if (!gled)
{
return -RT_ENOMEM;
}
gled->pin = rt_ofw_get_named_pin(np, RT_NULL, 0, RT_NULL, &gled->active_val);
if (gled->pin < 0)
{
err = gled->pin;
goto _fail;
}
gled->parent.ops = &gpio_led_ops;
if ((err = rt_led_register(&gled->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(&gled->parent, led_state);
rt_ofw_data(np) = &gled->parent;
return RT_EOK;
_fail:
rt_free(gled);
return err;
}
static rt_err_t gpio_led_probe(struct rt_platform_device *pdev)
{
rt_bool_t pinctrl_apply = RT_FALSE;
struct rt_ofw_node *led_np, *np = pdev->parent.ofw_node;
if (rt_ofw_prop_read_bool(np, "pinctrl-0"))
{
pinctrl_apply = RT_TRUE;
rt_pin_ctrl_confs_apply_by_name(&pdev->parent, RT_NULL);
}
rt_ofw_foreach_available_child_node(np, led_np)
{
rt_err_t err = ofw_append_gpio_led(led_np);
if (err == -RT_ENOMEM)
{
rt_ofw_node_put(led_np);
return err;
}
else if (err)
{
LOG_E("%s: create LED fail", rt_ofw_node_full_name(led_np));
continue;
}
if (!pinctrl_apply)
{
struct rt_device dev_tmp;
dev_tmp.ofw_node = led_np;
rt_pin_ctrl_confs_apply_by_name(&dev_tmp, RT_NULL);
}
}
return RT_EOK;
}
static rt_err_t gpio_led_remove(struct rt_platform_device *pdev)
{
struct gpio_led *gled;
struct rt_led_device *led_dev;
struct rt_ofw_node *led_np, *np = pdev->parent.ofw_node;
rt_ofw_foreach_available_child_node(np, led_np)
{
led_dev = rt_ofw_data(led_np);
if (!led_dev)
{
continue;
}
gled = rt_container_of(led_dev, struct gpio_led, parent);
rt_ofw_data(led_np) = RT_NULL;
rt_led_unregister(&gled->parent);
rt_free(gled);
}
return RT_EOK;
}
static const struct rt_ofw_node_id gpio_led_ofw_ids[] =
{
{ .compatible = "gpio-leds" },
{ /* sentinel */ }
};
static struct rt_platform_driver gpio_led_driver =
{
.name = "led-gpio",
.ids = gpio_led_ofw_ids,
.probe = gpio_led_probe,
.remove = gpio_led_remove,
};
RT_PLATFORM_DRIVER_EXPORT(gpio_led_driver);
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