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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 "input.keyboard.gpio"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
struct gpio_key
{
struct rt_input_device parent;
rt_base_t pin;
rt_uint8_t mode;
rt_uint32_t code;
};
static void gpio_key_event(void *data)
{
struct gpio_key *gkey = data;
rt_input_report_key(&gkey->parent, gkey->code, 1);
rt_input_sync(&gkey->parent);
rt_input_report_key(&gkey->parent, gkey->code, 0);
rt_input_sync(&gkey->parent);
}
static rt_err_t ofw_append_gpio_key(struct rt_ofw_node *np)
{
rt_err_t err = RT_EOK;
rt_uint32_t debounce;
const char *propname;
struct gpio_key *gkey = rt_calloc(1, sizeof(*gkey));
if (!gkey)
{
return -RT_ENOMEM;
}
gkey->pin = rt_ofw_get_named_pin(np, RT_NULL, 0, &gkey->mode, RT_NULL);
if (gkey->pin < 0)
{
err = gkey->pin;
goto _fail;
}
if ((propname = rt_ofw_get_prop_fuzzy_name(np, ",code$")) &&
!rt_ofw_prop_read_u32(np, propname, &gkey->code))
{
rt_input_set_capability(&gkey->parent, EV_KEY, gkey->code);
if (!(err = rt_input_device_register(&gkey->parent)))
{
err = rt_pin_attach_irq(gkey->pin, gkey->mode, gpio_key_event, gkey);
if (err)
{
rt_input_device_unregister(&gkey->parent);
goto _fail;
}
rt_pin_irq_enable(gkey->pin, RT_TRUE);
}
}
if (err)
{
goto _fail;
}
if (!rt_ofw_prop_read_u32(np, "debounce-interval", &debounce))
{
rt_pin_debounce(gkey->pin, debounce);
}
rt_ofw_data(np) = gkey;
return RT_EOK;
_fail:
rt_free(gkey);
return err;
}
static rt_err_t gpio_key_probe(struct rt_platform_device *pdev)
{
rt_err_t err = RT_EOK;
struct rt_ofw_node *key_np, *np = pdev->parent.ofw_node;
rt_ofw_foreach_available_child_node(np, key_np)
{
err = ofw_append_gpio_key(key_np);
if (err == -RT_ENOMEM)
{
rt_ofw_node_put(key_np);
return err;
}
else if (err)
{
LOG_E("%s: create KEY fail", rt_ofw_node_full_name(key_np));
continue;
}
}
return err;
}
static rt_err_t gpio_key_remove(struct rt_platform_device *pdev)
{
struct rt_ofw_node *key_np, *np = pdev->parent.ofw_node;
rt_ofw_foreach_available_child_node(np, key_np)
{
struct gpio_key *gkey = rt_ofw_data(key_np);
if (!gkey)
{
continue;
}
rt_ofw_data(key_np) = RT_NULL;
rt_pin_irq_enable(gkey->pin, RT_FALSE);
rt_pin_detach_irq(gkey->pin);
rt_input_device_unregister(&gkey->parent);
rt_free(gkey);
}
return RT_EOK;
}
static const struct rt_ofw_node_id gpio_key_ofw_ids[] =
{
{ .compatible = "gpio-keys" },
{ /* sentinel */ }
};
static struct rt_platform_driver gpio_key_driver =
{
.name = "gpio-keys",
.ids = gpio_key_ofw_ids,
.probe = gpio_key_probe,
.remove = gpio_key_remove,
};
RT_PLATFORM_DRIVER_EXPORT(gpio_key_driver);
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