/* * Copyright (c) 2020 Peter Johanson * * SPDX-License-Identifier: MIT */ #define DT_DRV_COMPAT alps_ec11 #include #include #include #include #include #include #include #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);