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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>
#include <rtdevice.h>
#include <rpi-sense.h>
struct rpisense_joystick
{
struct rt_input_device parent;
struct rpisense *rpisense;
rt_base_t pin;
rt_uint8_t active_val;
rt_int32_t prev_keys;
struct rt_thread *keys_task;
};
static rt_uint8_t keymap[5] =
{
KEY_DOWN, KEY_RIGHT, KEY_UP, KEY_ENTER, KEY_LEFT
};
static void rpisense_keys_task(void *param)
{
rt_int32_t keys, changes;
struct rpisense_joystick *rpisense_js = param;
while (RT_TRUE)
{
rt_thread_suspend(rpisense_js->keys_task);
rt_schedule();
keys = rpisense_reg_read(rpisense_js->rpisense, RPISENSE_KEYS);
changes = keys ^ rpisense_js->prev_keys;
rpisense_js->prev_keys = keys;
for (int i = 0; i < RT_ARRAY_SIZE(keymap); ++i)
{
if (changes & 1)
{
rt_input_report_key(&rpisense_js->parent, keymap[i], keys & 1);
}
changes >>= 1;
keys >>= 1;
}
rt_input_sync(&rpisense_js->parent);
}
}
static void rpisense_isr(void *args)
{
struct rpisense_joystick *rpisense_js = args;
rt_thread_resume(rpisense_js->keys_task);
}
static rt_err_t rpisense_js_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
struct rpisense *rpisense = pdev->priv;
struct rpisense_joystick *rpisense_js = rt_calloc(1, sizeof(*rpisense_js));
if (!rpisense_js)
{
return -RT_ENOMEM;
}
rpisense_js->rpisense = rpisense;
rpisense_js->pin = rt_pin_get_named_pin(&rpisense->i2c_client->parent,
"keys-int", 0, RT_NULL, &rpisense_js->active_val);
if (rpisense_js->pin < 0)
{
err = rpisense_js->pin;
goto _fail;
}
rt_pin_write(rpisense_js->pin, rpisense_js->active_val);
rt_pin_mode(rpisense_js->pin, PIN_MODE_INPUT);
rt_pin_attach_irq(rpisense_js->pin, PIN_IRQ_MODE_RISING, rpisense_isr, rpisense_js);
rt_pin_irq_enable(rpisense_js->pin, RT_TRUE);
for (int i = 0; i < RT_ARRAY_SIZE(keymap); ++i)
{
rt_input_set_capability(&rpisense_js->parent, EV_KEY, keymap[i]);
}
if ((err = rt_input_device_register(&rpisense_js->parent)))
{
goto _fail;
}
rpisense_js->keys_task = rt_thread_create("rpisense-js", &rpisense_keys_task,
rpisense_js, DM_THREAD_STACK_SIZE, RT_THREAD_PRIORITY_MAX / 2, 10);
if (!rpisense_js->keys_task)
{
rt_input_device_unregister(&rpisense_js->parent);
goto _fail;
}
pdev->parent.user_data = rpisense_js;
rt_thread_startup(rpisense_js->keys_task);
return RT_EOK;
_fail:
if (rpisense_js->pin >= 0)
{
rt_pin_detach_irq(rpisense_js->pin);
}
rt_free(rpisense_js);
return err;
}
static rt_err_t rpisense_js_remove(struct rt_platform_device *pdev)
{
struct rpisense_joystick *rpisense_js = pdev->parent.user_data;
rt_pin_irq_enable(rpisense_js->pin, RT_FALSE);
rt_pin_detach_irq(rpisense_js->pin);
rt_thread_delete(rpisense_js->keys_task);
rt_input_device_unregister(&rpisense_js->parent);
rt_free(rpisense_js);
return RT_EOK;
}
static struct rt_platform_driver rpisense_js_driver =
{
.name = "rpi-sense-js",
.probe = rpisense_js_probe,
.remove = rpisense_js_remove,
};
RT_PLATFORM_DRIVER_EXPORT(rpisense_js_driver);
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