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/*
* Copyright (C) 2015 Intel Corp
*
* 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 "sensor_cal.h"
#include <errno.h>
#include <cutils/log.h>
/* Load sensor calibration data */
int load_cali_data(const int sindex)
{
int err = 0, num, sum;
FILE *filp;
if (((sindex == ACCEL_SINDEX) && accl_cal_data_loaded) ||
((sindex == GYRO_SINDEX) && gyro_cal_data_loaded))
return 0;
filp = fopen(sensor_cali_data_path[sindex], "r");
if (filp == NULL) {
err = -errno;
ALOGE("failed to open %s, errno=%d", sensor_cali_data_path[sindex], err);
return err;
}
num = fscanf(filp, "%d %d %d %d",
&cal_data[sindex][0], &cal_data[sindex][1],
&cal_data[sindex][2], &sum);
if (num != 4) {
err = -EINVAL;
ALOGE("read %s data failed, num=%d", sensor_cali_data_path[sindex], num);
goto out;
}
if ((cal_data[sindex][0] + cal_data[sindex][1] + cal_data[sindex][2]) != sum) {
err = -EINVAL;
ALOGE("%s check sum error", sensor_cali_data_path[sindex]);
goto out;
}
out:
fclose(filp);
return err;
}
/* Write calibration data to iio channel offset */
void set_cali_offset(const int sindex, const bool wakeup)
{
#define MAX_BUF_LEN 64
int err, j;
FILE *filp;
char buf[MAX_BUF_LEN];
for (j = 0; j < (Z_AXIS_INDEX + 1); j++) {
err = snprintf(buf, MAX_BUF_LEN, "%s/%s",
sensor_sysfs_dir[sindex][wakeup], sensor_offset[sindex][j]);
if (err < 0) {
ALOGE("%s/%s snprintf err=%d",
sensor_sysfs_dir[sindex][wakeup], sensor_offset[sindex][j], err);
return;
}
filp = fopen(buf, "w");
if (filp == NULL) {
ALOGE("failed to open %s, errno=%d", buf, errno);
return;
}
fprintf(filp, "%d", cal_data[sindex][j]);
fclose(filp);
}
if (sindex == ACCEL_SINDEX)
accl_cal_data_loaded = true;
if (sindex == GYRO_SINDEX)
gyro_cal_data_loaded = true;
}
void do_cal_data_loading(const int sindex, const bool wakeup)
{
int err;
err = load_cali_data(sindex);
if (err != 0)
return;
set_cali_offset(sindex, wakeup);
}
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