mirror of
https://github.com/zephyrproject-rtos/zephyr
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e8d0090808
Fix bug that caused negative temperature values to be computed incorrectly. The sign bit needs to be perserved, when extracting the data sample from the TMP007_REG_TOBJ register. Jira: ZEP-499 Change-Id: Idbebd48b3164d7d4883352ef7128ef73be70e1b2 Signed-off-by: Bogdan Davidoaia <bogdan.m.davidoaia@intel.com>
151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <device.h>
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#include <i2c.h>
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#include <gpio.h>
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#include <misc/byteorder.h>
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#include <misc/util.h>
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#include <nanokernel.h>
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#include <sensor.h>
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#include <misc/__assert.h>
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#include "sensor_tmp007.h"
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int tmp007_reg_read(struct tmp007_data *drv_data, uint8_t reg, uint16_t *val)
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{
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struct i2c_msg msgs[2] = {
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{
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.buf = ®,
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.len = 1,
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.flags = I2C_MSG_WRITE | I2C_MSG_RESTART,
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},
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{
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.buf = (uint8_t *)val,
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.len = 2,
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.flags = I2C_MSG_READ | I2C_MSG_STOP,
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},
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};
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if (i2c_transfer(drv_data->i2c, msgs, 2, TMP007_I2C_ADDRESS) < 0) {
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return -EIO;
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}
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*val = sys_be16_to_cpu(*val);
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return 0;
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}
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int tmp007_reg_write(struct tmp007_data *drv_data, uint8_t reg, uint16_t val)
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{
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uint8_t tx_buf[3] = {reg, val >> 8, val & 0xFF};
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return i2c_write(drv_data->i2c, tx_buf, sizeof(tx_buf),
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TMP007_I2C_ADDRESS);
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}
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int tmp007_reg_update(struct tmp007_data *drv_data, uint8_t reg,
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uint16_t mask, uint16_t val)
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{
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uint16_t old_val = 0;
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uint16_t new_val;
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if (tmp007_reg_read(drv_data, reg, &old_val) < 0) {
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return -EIO;
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}
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new_val = old_val & ~mask;
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new_val |= val & mask;
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return tmp007_reg_write(drv_data, reg, new_val);
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}
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static int tmp007_sample_fetch(struct device *dev, enum sensor_channel chan)
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{
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struct tmp007_data *drv_data = dev->driver_data;
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uint16_t val;
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__ASSERT(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_TEMP);
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if (tmp007_reg_read(drv_data, TMP007_REG_TOBJ, &val) < 0) {
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return -EIO;
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}
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if (val & TMP007_DATA_INVALID_BIT) {
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return -EIO;
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}
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drv_data->sample = arithmetic_shift_right((int16_t)val, 2);
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return 0;
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}
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static int tmp007_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 tmp007_data *drv_data = dev->driver_data;
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int32_t uval;
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if (chan != SENSOR_CHAN_TEMP) {
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return -ENOTSUP;
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}
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uval = (int32_t)drv_data->sample * TMP007_TEMP_SCALE;
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val->type = SENSOR_VALUE_TYPE_INT_PLUS_MICRO;
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val->val1 = uval / 1000000;
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val->val2 = uval % 1000000;
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return 0;
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}
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static struct sensor_driver_api tmp007_driver_api = {
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#ifdef CONFIG_TMP007_TRIGGER
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.attr_set = tmp007_attr_set,
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.trigger_set = tmp007_trigger_set,
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#endif
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.sample_fetch = tmp007_sample_fetch,
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.channel_get = tmp007_channel_get,
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};
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int tmp007_init(struct device *dev)
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{
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struct tmp007_data *drv_data = dev->driver_data;
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drv_data->i2c = device_get_binding(CONFIG_TMP007_I2C_MASTER_DEV_NAME);
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if (drv_data->i2c == NULL) {
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SYS_LOG_DBG("Failed to get pointer to %s device!",
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CONFIG_TMP007_I2C_MASTER_DEV_NAME);
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return -EINVAL;
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}
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#ifdef CONFIG_TMP007_TRIGGER
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if (tmp007_init_interrupt(dev) < 0) {
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SYS_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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dev->driver_api = &tmp007_driver_api;
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return 0;
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}
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struct tmp007_data tmp007_driver;
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DEVICE_INIT(tmp007, CONFIG_TMP007_NAME, tmp007_init, &tmp007_driver,
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NULL, SECONDARY, CONFIG_TMP007_INIT_PRIORITY);
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