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/*
* Copyright (c) 2020 Peter Johanson
*
* SPDX-License-Identifier: MIT
*/
#define DT_DRV_COMPAT alps_ec11
#include <device.h>
#include <drivers/gpio.h>
#include <sys/util.h>
#include <kernel.h>
#include <drivers/sensor.h>
#include <sys/__assert.h>
#include <logging/log.h>
#include "ec11.h"
LOG_MODULE_REGISTER(EC11, CONFIG_SENSOR_LOG_LEVEL);
static int ec11_sample_fetch(struct device *dev, enum sensor_channel chan)
{
struct ec11_data *drv_data = dev->driver_data;
const struct ec11_config *drv_cfg = dev->config_info;
u8_t val;
s8_t delta;
__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_ROTATION);
val = (gpio_pin_get(drv_data->a, drv_cfg->a_pin) << 1) | gpio_pin_get(drv_data->b, drv_cfg->b_pin);
LOG_DBG("prev: %d, new: %d", drv_data->ab_state, val);
switch(val | (drv_data->ab_state << 2)) {
case 0b0001: case 0b0111: case 0b1110: case 0b1000:
delta = 1;
break;
case 0b0010: case 0b0100: case 0b1101: case 0b1011:
delta = -1;
break;
default:
delta = 0;
break;
}
LOG_DBG("Delta: %d", delta);
drv_data->pulses += delta;
drv_data->ab_state = val;
drv_data->ticks = drv_data->pulses / drv_cfg->resolution;
drv_data->delta = delta;
drv_data->pulses %= drv_cfg->resolution;
return 0;
}
static int ec11_channel_get(struct device *dev,
enum sensor_channel chan,
struct sensor_value *val)
{
struct ec11_data *drv_data = dev->driver_data;
if (chan != SENSOR_CHAN_ROTATION) {
return -ENOTSUP;
}
val->val1 = drv_data->ticks;
val->val2 = drv_data->delta;
return 0;
}
static const struct sensor_driver_api ec11_driver_api = {
#ifdef CONFIG_EC11_TRIGGER
.trigger_set = ec11_trigger_set,
#endif
.sample_fetch = ec11_sample_fetch,
.channel_get = ec11_channel_get,
};
int ec11_init(struct device *dev)
{
struct ec11_data *drv_data = dev->driver_data;
const struct ec11_config *drv_cfg = dev->config_info;
LOG_DBG("resolution %d", drv_cfg->resolution);
drv_data->a = device_get_binding(drv_cfg->a_label);
if (drv_data->a == NULL) {
LOG_ERR("Failed to get pointer to A GPIO device");
return -EINVAL;
}
drv_data->b = device_get_binding(drv_cfg->b_label);
if (drv_data->b == NULL) {
LOG_ERR("Failed to get pointer to B GPIO device");
return -EINVAL;
}
#ifdef CONFIG_EC11_TRIGGER
if (ec11_init_interrupt(dev) < 0) {
LOG_DBG("Failed to initialize interrupt!");
return -EIO;
}
#endif
return 0;
}
struct ec11_data ec11_data;
const struct ec11_config ec11_cfg = {
.a_label = DT_INST_GPIO_LABEL(0, a_gpios),
.a_pin = DT_INST_GPIO_PIN(0, a_gpios),
.a_flags = DT_INST_GPIO_FLAGS(0, a_gpios),
.b_label = DT_INST_GPIO_LABEL(0, b_gpios),
.b_pin = DT_INST_GPIO_PIN(0, b_gpios),
.b_flags = DT_INST_GPIO_FLAGS(0, b_gpios),
COND_CODE_0(DT_INST_NODE_HAS_PROP(0, resolution), (1), (DT_INST_PROP(0, resolution))),
};
DEVICE_AND_API_INIT(ec11, DT_INST_LABEL(0), ec11_init,
&ec11_data,
&ec11_cfg, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY,
&ec11_driver_api);
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