153 lines
4.2 KiB
C
153 lines
4.2 KiB
C
/*
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* Copyright (c) 2020 The ZMK Contributors
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*
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* SPDX-License-Identifier: MIT
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*/
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#define DT_DRV_COMPAT alps_ec11
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#include <device.h>
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#include <drivers/gpio.h>
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#include <sys/util.h>
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#include <kernel.h>
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#include <drivers/sensor.h>
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#include <sys/__assert.h>
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#include <logging/log.h>
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#include "ec11.h"
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LOG_MODULE_REGISTER(EC11, CONFIG_SENSOR_LOG_LEVEL);
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static int ec11_get_ab_state(struct device *dev)
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{
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struct ec11_data *drv_data = dev->driver_data;
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const struct ec11_config *drv_cfg = dev->config_info;
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return (gpio_pin_get(drv_data->a, drv_cfg->a_pin) << 1) | gpio_pin_get(drv_data->b, drv_cfg->b_pin);
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}
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static int ec11_sample_fetch(struct device *dev, enum sensor_channel chan)
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{
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struct ec11_data *drv_data = dev->driver_data;
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const struct ec11_config *drv_cfg = dev->config_info;
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u8_t val;
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s8_t delta;
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_ROTATION);
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val = ec11_get_ab_state(dev);
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LOG_DBG("prev: %d, new: %d", drv_data->ab_state, val);
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switch(val | (drv_data->ab_state << 2)) {
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case 0b0010: case 0b0100: case 0b1101: case 0b1011:
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delta = -1;
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break;
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case 0b0001: case 0b0111: case 0b1110: case 0b1000:
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delta = 1;
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break;
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default:
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delta = 0;
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break;
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}
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LOG_DBG("Delta: %d", delta);
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drv_data->pulses += delta;
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drv_data->ab_state = val;
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drv_data->ticks = drv_data->pulses / drv_cfg->resolution;
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drv_data->delta = delta;
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drv_data->pulses %= drv_cfg->resolution;
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return 0;
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}
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static int ec11_channel_get(struct device *dev,
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enum sensor_channel chan,
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struct sensor_value *val)
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{
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struct ec11_data *drv_data = dev->driver_data;
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if (chan != SENSOR_CHAN_ROTATION) {
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return -ENOTSUP;
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}
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val->val1 = drv_data->ticks;
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val->val2 = drv_data->delta;
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return 0;
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}
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static const struct sensor_driver_api ec11_driver_api = {
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#ifdef CONFIG_EC11_TRIGGER
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.trigger_set = ec11_trigger_set,
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#endif
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.sample_fetch = ec11_sample_fetch,
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.channel_get = ec11_channel_get,
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};
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int ec11_init(struct device *dev)
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{
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struct ec11_data *drv_data = dev->driver_data;
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const struct ec11_config *drv_cfg = dev->config_info;
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LOG_DBG("A: %s %d B: %s %d resolution %d", drv_cfg->a_label, drv_cfg->a_pin, drv_cfg->b_label, drv_cfg->b_pin, drv_cfg->resolution);
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drv_data->a = device_get_binding(drv_cfg->a_label);
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if (drv_data->a == NULL) {
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LOG_ERR("Failed to get pointer to A GPIO device");
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return -EINVAL;
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}
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drv_data->b = device_get_binding(drv_cfg->b_label);
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if (drv_data->b == NULL) {
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LOG_ERR("Failed to get pointer to B GPIO device");
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return -EINVAL;
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}
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if (gpio_pin_configure(drv_data->a, drv_cfg->a_pin,
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drv_cfg->a_flags
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| GPIO_INPUT)) {
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LOG_DBG("Failed to configure A pin");
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return -EIO;
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}
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if (gpio_pin_configure(drv_data->b, drv_cfg->b_pin,
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drv_cfg->b_flags
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| GPIO_INPUT)) {
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LOG_DBG("Failed to configure B pin");
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return -EIO;
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}
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#ifdef CONFIG_EC11_TRIGGER
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if (ec11_init_interrupt(dev) < 0) {
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LOG_DBG("Failed to initialize interrupt!");
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return -EIO;
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}
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#endif
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drv_data->ab_state = ec11_get_ab_state(dev);
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return 0;
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}
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#define EC11_INST(n) \
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struct ec11_data ec11_data_##n; \
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const struct ec11_config ec11_cfg_##n = { \
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.a_label = DT_INST_GPIO_LABEL(n, a_gpios), \
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.a_pin = DT_INST_GPIO_PIN(n, a_gpios), \
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.a_flags = DT_INST_GPIO_FLAGS(n, a_gpios), \
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.b_label = DT_INST_GPIO_LABEL(n, b_gpios), \
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.b_pin = DT_INST_GPIO_PIN(n, b_gpios), \
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.b_flags = DT_INST_GPIO_FLAGS(n, b_gpios), \
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COND_CODE_0(DT_INST_NODE_HAS_PROP(n, resolution), (1), (DT_INST_PROP(n, resolution))), \
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}; \
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DEVICE_AND_API_INIT(ec11, DT_INST_LABEL(n), ec11_init, \
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&ec11_data_##n, \
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&ec11_cfg_##n, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY, \
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&ec11_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(EC11_INST) |