146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
/*
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* Copyright (c) 2019 Peter Bigot Consulting, LLC
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* Copyright (c) 2016 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT microchip_mcp9808
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#include <errno.h>
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#include <kernel.h>
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#include <drivers/i2c.h>
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#include <init.h>
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#include <sys/byteorder.h>
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#include <sys/__assert.h>
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#include <logging/log.h>
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#include "mcp9808.h"
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LOG_MODULE_REGISTER(MCP9808, CONFIG_SENSOR_LOG_LEVEL);
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int mcp9808_reg_read(const struct device *dev, uint8_t reg, uint16_t *val)
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{
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struct mcp9808_data *data = dev->data;
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const struct mcp9808_config *cfg = dev->config;
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int rc = i2c_write_read(data->i2c_master, cfg->i2c_addr,
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®, sizeof(reg),
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val, sizeof(*val));
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if (rc == 0) {
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*val = sys_be16_to_cpu(*val);
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}
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return rc;
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}
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int mcp9808_reg_write_16bit(const struct device *dev, uint8_t reg,
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uint16_t val)
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{
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struct mcp9808_data *data = dev->data;
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const struct mcp9808_config *cfg = dev->config;
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uint8_t buf[3];
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buf[0] = reg;
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sys_put_be16(val, &buf[1]);
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return i2c_write(data->i2c_master, buf, sizeof(buf), cfg->i2c_addr);
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}
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int mcp9808_reg_write_8bit(const struct device *dev, uint8_t reg,
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uint8_t val)
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{
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struct mcp9808_data *data = dev->data;
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const struct mcp9808_config *cfg = dev->config;
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uint8_t buf[2] = {
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reg,
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val,
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};
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return i2c_write(data->i2c_master, buf, sizeof(buf), cfg->i2c_addr);
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}
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static int mcp9808_set_temperature_resolution(const struct device *dev,
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uint8_t resolution)
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{
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return mcp9808_reg_write_8bit(dev, MCP9808_REG_RESOLUTION, resolution);
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}
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static int mcp9808_sample_fetch(const struct device *dev,
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enum sensor_channel chan)
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{
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struct mcp9808_data *data = dev->data;
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_AMBIENT_TEMP);
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return mcp9808_reg_read(dev, MCP9808_REG_TEMP_AMB, &data->reg_val);
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}
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static int mcp9808_channel_get(const 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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const struct mcp9808_data *data = dev->data;
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int temp = mcp9808_temp_signed_from_reg(data->reg_val);
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_AMBIENT_TEMP);
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val->val1 = temp / MCP9808_TEMP_SCALE_CEL;
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temp -= val->val1 * MCP9808_TEMP_SCALE_CEL;
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val->val2 = (temp * 1000000) / MCP9808_TEMP_SCALE_CEL;
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return 0;
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}
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static const struct sensor_driver_api mcp9808_api_funcs = {
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.sample_fetch = mcp9808_sample_fetch,
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.channel_get = mcp9808_channel_get,
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#ifdef CONFIG_MCP9808_TRIGGER
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.attr_set = mcp9808_attr_set,
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.trigger_set = mcp9808_trigger_set,
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#endif /* CONFIG_MCP9808_TRIGGER */
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};
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int mcp9808_init(const struct device *dev)
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{
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struct mcp9808_data *data = dev->data;
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const struct mcp9808_config *cfg = dev->config;
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int rc = 0;
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data->i2c_master = device_get_binding(cfg->i2c_bus);
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if (!data->i2c_master) {
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LOG_ERR("mcp9808: i2c master not found: %s", cfg->i2c_bus);
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return -EINVAL;
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}
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rc = mcp9808_set_temperature_resolution(dev, cfg->resolution);
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if (rc) {
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LOG_ERR("Could not set the resolution of mcp9808 module");
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return rc;
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}
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#ifdef CONFIG_MCP9808_TRIGGER
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rc = mcp9808_setup_interrupt(dev);
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#endif /* CONFIG_MCP9808_TRIGGER */
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return rc;
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}
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static struct mcp9808_data mcp9808_data;
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static const struct mcp9808_config mcp9808_cfg = {
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.i2c_bus = DT_INST_BUS_LABEL(0),
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.i2c_addr = DT_INST_REG_ADDR(0),
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.resolution = DT_INST_PROP(0, resolution),
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#ifdef CONFIG_MCP9808_TRIGGER
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.alert_pin = DT_INST_GPIO_PIN(0, int_gpios),
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.alert_flags = DT_INST_GPIO_FLAGS(0, int_gpios),
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.alert_controller = DT_INST_GPIO_LABEL(0, int_gpios),
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#endif /* CONFIG_MCP9808_TRIGGER */
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};
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DEVICE_DT_INST_DEFINE(0, mcp9808_init, NULL,
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&mcp9808_data, &mcp9808_cfg, POST_KERNEL,
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CONFIG_SENSOR_INIT_PRIORITY, &mcp9808_api_funcs);
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