1 files changed, 95 insertions, 0 deletions
diff --git a/libsensors_iio/src/sensor_cal.c b/libsensors_iio/src/sensor_cal.c
new file mode 100644
index 0000000..1d14611
--- /dev/null
+++ b/libsensors_iio/src/sensor_cal.c
@@ -0,0 +1,95 @@
+/*
+ * 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 <cutils/log.h>
+#include "sensor_cal.h"
+
+/* Load sensor calibration data */
+int load_cali_data(const int sindex)
+{
+    int err = 0, num, sum;
+    FILE *filp;
+
+    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)
+{
+#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], sensor_offset[sindex][j]);
+        if (err < 0) {
+            ALOGE("%s/%s snprintf err=%d",
+                sensor_sysfs_dir[sindex], 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)
+{
+    int err;
+
+    err = load_cali_data(sindex);
+    if (err != 0)
+        return;
+
+    set_cali_offset(sindex);
+
+}