| /* |
| * Copyright (c) 2019 Peter Bigot Consulting, LLC |
| * Copyright (c) 2016 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #define DT_DRV_COMPAT microchip_mcp9808 |
| |
| #include <errno.h> |
| |
| #include <zephyr/kernel.h> |
| #include <zephyr/drivers/i2c.h> |
| #include <zephyr/init.h> |
| #include <zephyr/sys/byteorder.h> |
| #include <zephyr/sys/__assert.h> |
| #include <zephyr/logging/log.h> |
| |
| #include "mcp9808.h" |
| |
| LOG_MODULE_REGISTER(MCP9808, CONFIG_SENSOR_LOG_LEVEL); |
| |
| int mcp9808_reg_read(const struct device *dev, uint8_t reg, uint16_t *val) |
| { |
| const struct mcp9808_config *cfg = dev->config; |
| int rc = i2c_write_read_dt(&cfg->i2c, ®, sizeof(reg), val, |
| sizeof(*val)); |
| |
| if (rc == 0) { |
| *val = sys_be16_to_cpu(*val); |
| } |
| |
| return rc; |
| } |
| |
| int mcp9808_reg_write_16bit(const struct device *dev, uint8_t reg, |
| uint16_t val) |
| { |
| const struct mcp9808_config *cfg = dev->config; |
| |
| uint8_t buf[3]; |
| |
| buf[0] = reg; |
| sys_put_be16(val, &buf[1]); |
| |
| return i2c_write_dt(&cfg->i2c, buf, sizeof(buf)); |
| } |
| |
| int mcp9808_reg_write_8bit(const struct device *dev, uint8_t reg, |
| uint8_t val) |
| { |
| const struct mcp9808_config *cfg = dev->config; |
| uint8_t buf[2] = { |
| reg, |
| val, |
| }; |
| |
| return i2c_write_dt(&cfg->i2c, buf, sizeof(buf)); |
| } |
| |
| static int mcp9808_set_temperature_resolution(const struct device *dev, |
| uint8_t resolution) |
| { |
| return mcp9808_reg_write_8bit(dev, MCP9808_REG_RESOLUTION, resolution); |
| } |
| |
| static int mcp9808_sample_fetch(const struct device *dev, |
| enum sensor_channel chan) |
| { |
| struct mcp9808_data *data = dev->data; |
| |
| __ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_AMBIENT_TEMP); |
| |
| return mcp9808_reg_read(dev, MCP9808_REG_TEMP_AMB, &data->reg_val); |
| } |
| |
| static int mcp9808_channel_get(const struct device *dev, |
| enum sensor_channel chan, |
| struct sensor_value *val) |
| { |
| const struct mcp9808_data *data = dev->data; |
| int temp = mcp9808_temp_signed_from_reg(data->reg_val); |
| |
| __ASSERT_NO_MSG(chan == SENSOR_CHAN_AMBIENT_TEMP); |
| |
| if (chan != SENSOR_CHAN_AMBIENT_TEMP) { |
| return -ENOTSUP; |
| } |
| |
| val->val1 = temp / MCP9808_TEMP_SCALE_CEL; |
| temp -= val->val1 * MCP9808_TEMP_SCALE_CEL; |
| val->val2 = (temp * 1000000) / MCP9808_TEMP_SCALE_CEL; |
| |
| return 0; |
| } |
| |
| static const struct sensor_driver_api mcp9808_api_funcs = { |
| .sample_fetch = mcp9808_sample_fetch, |
| .channel_get = mcp9808_channel_get, |
| #ifdef CONFIG_MCP9808_TRIGGER |
| .attr_set = mcp9808_attr_set, |
| .trigger_set = mcp9808_trigger_set, |
| #endif /* CONFIG_MCP9808_TRIGGER */ |
| }; |
| |
| int mcp9808_init(const struct device *dev) |
| { |
| const struct mcp9808_config *cfg = dev->config; |
| int rc = 0; |
| |
| if (!device_is_ready(cfg->i2c.bus)) { |
| LOG_ERR("Bus device is not ready"); |
| return -ENODEV; |
| } |
| |
| rc = mcp9808_set_temperature_resolution(dev, cfg->resolution); |
| if (rc) { |
| LOG_ERR("Could not set the resolution of mcp9808 module"); |
| return rc; |
| } |
| |
| #ifdef CONFIG_MCP9808_TRIGGER |
| if (cfg->int_gpio.port) { |
| rc = mcp9808_setup_interrupt(dev); |
| } |
| #endif /* CONFIG_MCP9808_TRIGGER */ |
| |
| return rc; |
| } |
| |
| #define MCP9808_DEFINE(inst) \ |
| static struct mcp9808_data mcp9808_data_##inst; \ |
| \ |
| static const struct mcp9808_config mcp9808_config_##inst = { \ |
| .i2c = I2C_DT_SPEC_INST_GET(inst), \ |
| .resolution = DT_INST_PROP(inst, resolution), \ |
| IF_ENABLED(CONFIG_MCP9808_TRIGGER, \ |
| (.int_gpio = GPIO_DT_SPEC_INST_GET_OR(inst, int_gpios, { 0 }),)) \ |
| }; \ |
| \ |
| SENSOR_DEVICE_DT_INST_DEFINE(inst, mcp9808_init, NULL, \ |
| &mcp9808_data_##inst, &mcp9808_config_##inst, POST_KERNEL, \ |
| CONFIG_SENSOR_INIT_PRIORITY, &mcp9808_api_funcs); \ |
| |
| DT_INST_FOREACH_STATUS_OKAY(MCP9808_DEFINE) |