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/*
* Copyright (c) 2016 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <device.h>
#include <i2c.h>
#include <gpio.h>
#include <misc/byteorder.h>
#include <misc/util.h>
#include <kernel.h>
#include <sensor.h>
#include <misc/__assert.h>
#include "tmp007.h"
int tmp007_reg_read(struct tmp007_data *drv_data, uint8_t reg, uint16_t *val)
{
struct i2c_msg msgs[2] = {
{
.buf = ®,
.len = 1,
.flags = I2C_MSG_WRITE | I2C_MSG_RESTART,
},
{
.buf = (uint8_t *)val,
.len = 2,
.flags = I2C_MSG_READ | I2C_MSG_STOP,
},
};
if (i2c_transfer(drv_data->i2c, msgs, 2, TMP007_I2C_ADDRESS) < 0) {
return -EIO;
}
*val = sys_be16_to_cpu(*val);
return 0;
}
int tmp007_reg_write(struct tmp007_data *drv_data, uint8_t reg, uint16_t val)
{
uint8_t tx_buf[3] = {reg, val >> 8, val & 0xFF};
return i2c_write(drv_data->i2c, tx_buf, sizeof(tx_buf),
TMP007_I2C_ADDRESS);
}
int tmp007_reg_update(struct tmp007_data *drv_data, uint8_t reg,
uint16_t mask, uint16_t val)
{
uint16_t old_val = 0;
uint16_t new_val;
if (tmp007_reg_read(drv_data, reg, &old_val) < 0) {
return -EIO;
}
new_val = old_val & ~mask;
new_val |= val & mask;
return tmp007_reg_write(drv_data, reg, new_val);
}
static int tmp007_sample_fetch(struct device *dev, enum sensor_channel chan)
{
struct tmp007_data *drv_data = dev->driver_data;
uint16_t val;
__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_TEMP);
if (tmp007_reg_read(drv_data, TMP007_REG_TOBJ, &val) < 0) {
return -EIO;
}
if (val & TMP007_DATA_INVALID_BIT) {
return -EIO;
}
drv_data->sample = arithmetic_shift_right((int16_t)val, 2);
return 0;
}
static int tmp007_channel_get(struct device *dev,
enum sensor_channel chan,
struct sensor_value *val)
{
struct tmp007_data *drv_data = dev->driver_data;
int32_t uval;
if (chan != SENSOR_CHAN_TEMP) {
return -ENOTSUP;
}
uval = (int32_t)drv_data->sample * TMP007_TEMP_SCALE;
val->type = SENSOR_VALUE_TYPE_INT_PLUS_MICRO;
val->val1 = uval / 1000000;
val->val2 = uval % 1000000;
return 0;
}
static const struct sensor_driver_api tmp007_driver_api = {
#ifdef CONFIG_TMP007_TRIGGER
.attr_set = tmp007_attr_set,
.trigger_set = tmp007_trigger_set,
#endif
.sample_fetch = tmp007_sample_fetch,
.channel_get = tmp007_channel_get,
};
int tmp007_init(struct device *dev)
{
struct tmp007_data *drv_data = dev->driver_data;
drv_data->i2c = device_get_binding(CONFIG_TMP007_I2C_MASTER_DEV_NAME);
if (drv_data->i2c == NULL) {
SYS_LOG_DBG("Failed to get pointer to %s device!",
CONFIG_TMP007_I2C_MASTER_DEV_NAME);
return -EINVAL;
}
#ifdef CONFIG_TMP007_TRIGGER
if (tmp007_init_interrupt(dev) < 0) {
SYS_LOG_DBG("Failed to initialize interrupt!");
return -EIO;
}
#endif
dev->driver_api = &tmp007_driver_api;
return 0;
}
struct tmp007_data tmp007_driver;
DEVICE_INIT(tmp007, CONFIG_TMP007_NAME, tmp007_init, &tmp007_driver,
NULL, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY);
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