| /* |
| * Copyright (c) 2016 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #define DT_DRV_COMPAT ti_hdc |
| |
| #include <device.h> |
| #include <drivers/i2c.h> |
| #include <drivers/gpio.h> |
| #include <kernel.h> |
| #include <drivers/sensor.h> |
| #include <sys/util.h> |
| #include <sys/__assert.h> |
| #include <logging/log.h> |
| |
| #include "ti_hdc.h" |
| |
| LOG_MODULE_REGISTER(TI_HDC, CONFIG_SENSOR_LOG_LEVEL); |
| |
| #if DT_INST_NODE_HAS_PROP(0, drdy_gpios) |
| static void ti_hdc_gpio_callback(const struct device *dev, |
| struct gpio_callback *cb, uint32_t pins) |
| { |
| struct ti_hdc_data *drv_data = |
| CONTAINER_OF(cb, struct ti_hdc_data, gpio_cb); |
| |
| ARG_UNUSED(pins); |
| |
| gpio_pin_interrupt_configure(drv_data->gpio, |
| DT_INST_GPIO_PIN(0, drdy_gpios), |
| GPIO_INT_DISABLE); |
| k_sem_give(&drv_data->data_sem); |
| } |
| #endif |
| |
| static int ti_hdc_sample_fetch(const struct device *dev, |
| enum sensor_channel chan) |
| { |
| struct ti_hdc_data *drv_data = dev->data; |
| uint8_t buf[4]; |
| |
| __ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL); |
| |
| #if DT_INST_NODE_HAS_PROP(0, drdy_gpios) |
| gpio_pin_interrupt_configure(drv_data->gpio, |
| DT_INST_GPIO_PIN(0, drdy_gpios), |
| GPIO_INT_EDGE_TO_ACTIVE); |
| #endif |
| |
| buf[0] = TI_HDC_REG_TEMP; |
| if (i2c_write(drv_data->i2c, buf, 1, |
| DT_INST_REG_ADDR(0)) < 0) { |
| LOG_DBG("Failed to write address pointer"); |
| return -EIO; |
| } |
| |
| #if DT_INST_NODE_HAS_PROP(0, drdy_gpios) |
| k_sem_take(&drv_data->data_sem, K_FOREVER); |
| #else |
| /* wait for the conversion to finish */ |
| k_msleep(HDC_CONVERSION_TIME); |
| #endif |
| |
| if (i2c_read(drv_data->i2c, buf, 4, DT_INST_REG_ADDR(0)) < 0) { |
| LOG_DBG("Failed to read sample data"); |
| return -EIO; |
| } |
| |
| drv_data->t_sample = (buf[0] << 8) + buf[1]; |
| drv_data->rh_sample = (buf[2] << 8) + buf[3]; |
| |
| return 0; |
| } |
| |
| |
| static int ti_hdc_channel_get(const struct device *dev, |
| enum sensor_channel chan, |
| struct sensor_value *val) |
| { |
| struct ti_hdc_data *drv_data = dev->data; |
| uint64_t tmp; |
| |
| /* |
| * See datasheet "Temperature Register" and "Humidity |
| * Register" sections for more details on processing |
| * sample data. |
| */ |
| if (chan == SENSOR_CHAN_AMBIENT_TEMP) { |
| /* val = -40 + 165 * sample / 2^16 */ |
| tmp = (uint64_t)drv_data->t_sample * 165U; |
| val->val1 = (int32_t)(tmp >> 16) - 40; |
| val->val2 = ((tmp & 0xFFFF) * 1000000U) >> 16; |
| } else if (chan == SENSOR_CHAN_HUMIDITY) { |
| /* val = 100 * sample / 2^16 */ |
| tmp = (uint64_t)drv_data->rh_sample * 100U; |
| val->val1 = tmp >> 16; |
| /* x * 1000000 / 65536 == x * 15625 / 1024 */ |
| val->val2 = ((tmp & 0xFFFF) * 15625U) >> 10; |
| } else { |
| return -ENOTSUP; |
| } |
| |
| return 0; |
| } |
| |
| static const struct sensor_driver_api ti_hdc_driver_api = { |
| .sample_fetch = ti_hdc_sample_fetch, |
| .channel_get = ti_hdc_channel_get, |
| }; |
| |
| static uint16_t read16(const struct device *dev, uint8_t a, uint8_t d) |
| { |
| uint8_t buf[2]; |
| if (i2c_burst_read(dev, a, d, (uint8_t *)buf, 2) < 0) { |
| LOG_ERR("Error reading register."); |
| } |
| return (buf[0] << 8 | buf[1]); |
| } |
| |
| static int ti_hdc_init(const struct device *dev) |
| { |
| struct ti_hdc_data *drv_data = dev->data; |
| uint16_t tmp; |
| |
| drv_data->i2c = device_get_binding(DT_INST_BUS_LABEL(0)); |
| |
| if (drv_data->i2c == NULL) { |
| LOG_DBG("Failed to get pointer to %s device!", |
| DT_INST_BUS_LABEL(0)); |
| return -EINVAL; |
| } |
| |
| if (read16(drv_data->i2c, DT_INST_REG_ADDR(0), |
| TI_HDC_REG_MANUFID) != TI_HDC_MANUFID) { |
| LOG_ERR("Failed to get correct manufacturer ID"); |
| return -EINVAL; |
| } |
| tmp = read16(drv_data->i2c, DT_INST_REG_ADDR(0), |
| TI_HDC_REG_DEVICEID); |
| if (tmp != TI_HDC1000_DEVID && tmp != TI_HDC1050_DEVID) { |
| LOG_ERR("Unsupported device ID"); |
| return -EINVAL; |
| } |
| |
| #if DT_INST_NODE_HAS_PROP(0, drdy_gpios) |
| k_sem_init(&drv_data->data_sem, 0, UINT_MAX); |
| |
| /* setup data ready gpio interrupt */ |
| drv_data->gpio = device_get_binding( |
| DT_INST_GPIO_LABEL(0, drdy_gpios)); |
| if (drv_data->gpio == NULL) { |
| LOG_DBG("Failed to get pointer to %s device", |
| DT_INST_GPIO_LABEL(0, drdy_gpios)); |
| return -EINVAL; |
| } |
| |
| gpio_pin_configure(drv_data->gpio, DT_INST_GPIO_PIN(0, drdy_gpios), |
| GPIO_INPUT | DT_INST_GPIO_FLAGS(0, drdy_gpios)); |
| |
| gpio_init_callback(&drv_data->gpio_cb, |
| ti_hdc_gpio_callback, |
| BIT(DT_INST_GPIO_PIN(0, drdy_gpios))); |
| |
| if (gpio_add_callback(drv_data->gpio, &drv_data->gpio_cb) < 0) { |
| LOG_DBG("Failed to set GPIO callback"); |
| return -EIO; |
| } |
| |
| gpio_pin_interrupt_configure(drv_data->gpio, |
| DT_INST_GPIO_PIN(0, drdy_gpios), |
| GPIO_INT_EDGE_TO_ACTIVE); |
| #endif |
| |
| LOG_INF("Initialized device successfully"); |
| |
| return 0; |
| } |
| |
| static struct ti_hdc_data ti_hdc_data; |
| |
| DEVICE_AND_API_INIT(ti_hdc, DT_INST_LABEL(0), ti_hdc_init, &ti_hdc_data, |
| NULL, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY, |
| &ti_hdc_driver_api); |