+
+char* sensor_get_string_type(int s)
+{
+ int catalog_index;
+ int sensor_type;
+
+ catalog_index = sensor_info[s].catalog_index;
+ sensor_type = sensor_catalog[catalog_index].type;
+
+ switch (sensor_type) {
+ case SENSOR_TYPE_ACCELEROMETER:
+ return SENSOR_STRING_TYPE_ACCELEROMETER;
+
+ case SENSOR_TYPE_MAGNETIC_FIELD:
+ return SENSOR_STRING_TYPE_MAGNETIC_FIELD;
+
+ case SENSOR_TYPE_ORIENTATION:
+ return SENSOR_STRING_TYPE_ORIENTATION;
+
+ case SENSOR_TYPE_GYROSCOPE:
+ return SENSOR_STRING_TYPE_GYROSCOPE;
+
+ case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
+ return SENSOR_STRING_TYPE_GYROSCOPE_UNCALIBRATED;
+
+ case SENSOR_TYPE_LIGHT:
+ return SENSOR_STRING_TYPE_LIGHT;
+
+ case SENSOR_TYPE_AMBIENT_TEMPERATURE:
+ return SENSOR_STRING_TYPE_AMBIENT_TEMPERATURE;
+
+ case SENSOR_TYPE_TEMPERATURE:
+ return SENSOR_STRING_TYPE_TEMPERATURE;
+
+ case SENSOR_TYPE_PROXIMITY:
+ return SENSOR_STRING_TYPE_PROXIMITY;
+
+ case SENSOR_TYPE_PRESSURE:
+ return SENSOR_STRING_TYPE_PRESSURE;
+
+ case SENSOR_TYPE_RELATIVE_HUMIDITY:
+ return SENSOR_STRING_TYPE_RELATIVE_HUMIDITY;
+
+ default:
+ return "";
+ }
+}
+
+flag_t sensor_get_flags (int s)
+{
+ int catalog_index;
+ int sensor_type;
+
+ flag_t flags = 0x0;
+ catalog_index = sensor_info[s].catalog_index;
+ sensor_type = sensor_catalog[catalog_index].type;
+
+ switch (sensor_type) {
+ case SENSOR_TYPE_ACCELEROMETER:
+ case SENSOR_TYPE_MAGNETIC_FIELD:
+ case SENSOR_TYPE_ORIENTATION:
+ case SENSOR_TYPE_GYROSCOPE:
+ case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
+ case SENSOR_TYPE_PRESSURE:
+ flags |= SENSOR_FLAG_CONTINUOUS_MODE;
+ break;
+
+ case SENSOR_TYPE_LIGHT:
+ case SENSOR_TYPE_AMBIENT_TEMPERATURE:
+ case SENSOR_TYPE_TEMPERATURE:
+ case SENSOR_TYPE_RELATIVE_HUMIDITY:
+ flags |= SENSOR_FLAG_ON_CHANGE_MODE;
+ break;
+
+
+ case SENSOR_TYPE_PROXIMITY:
+ flags |= SENSOR_FLAG_WAKE_UP;
+ flags |= SENSOR_FLAG_ON_CHANGE_MODE;
+ break;
+
+ default:
+ ALOGI("Unknown sensor");
+ }
+ return flags;
+}
+
+int get_cdd_freq(int s, int must)
+{
+ int catalog_index = sensor_info[s].catalog_index;
+ int sensor_type = sensor_catalog[catalog_index].type;
+
+ switch (sensor_type) {
+ case SENSOR_TYPE_ACCELEROMETER:
+ return (must ? 100 : 200); /* must 100 Hz, should 200 Hz, CDD compliant */
+ case SENSOR_TYPE_GYROSCOPE:
+ case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
+ return (must ? 200 : 200); /* must 200 Hz, should 200 Hz, CDD compliant */
+ case SENSOR_TYPE_MAGNETIC_FIELD:
+ return (must ? 10 : 50); /* must 10 Hz, should 50 Hz, CDD compliant */
+ case SENSOR_TYPE_LIGHT:
+ case SENSOR_TYPE_AMBIENT_TEMPERATURE:
+ case SENSOR_TYPE_TEMPERATURE:
+ return (must ? 1 : 2); /* must 1 Hz, should 2Hz, not mentioned in CDD */
+ default:
+ return 0;
+ }
+}
+
+/* This value is defined only for continuous mode and on-change sensors. It is the delay between
+ * two sensor events corresponding to the lowest frequency that this sensor supports. When lower
+ * frequencies are requested through batch()/setDelay() the events will be generated at this
+ * frequency instead. It can be used by the framework or applications to estimate when the batch
+ * FIFO may be full.
+ *
+ * NOTE: 1) period_ns is in nanoseconds where as maxDelay/minDelay are in microseconds.
+ * continuous, on-change: maximum sampling period allowed in microseconds.
+ * one-shot, special : 0
+ * 2) maxDelay should always fit within a 32 bit signed integer. It is declared as 64 bit
+ * on 64 bit architectures only for binary compatibility reasons.
+ * Availability: SENSORS_DEVICE_API_VERSION_1_3
+ */
+max_delay_t sensor_get_max_delay (int s)
+{
+ char avail_sysfs_path[PATH_MAX];
+ int dev_num = sensor_info[s].dev_num;
+ char freqs_buf[100];
+ char* cursor;
+ float min_supported_rate = 1000;
+ float sr;
+
+ /* continuous, on-change: maximum sampling period allowed in microseconds.
+ * one-shot, special : 0
+ */
+ if (REPORTING_MODE(sensor_desc[s].flags) == SENSOR_FLAG_ONE_SHOT_MODE ||
+ REPORTING_MODE(sensor_desc[s].flags) == SENSOR_FLAG_SPECIAL_REPORTING_MODE)
+ return 0;
+
+ sprintf(avail_sysfs_path, DEVICE_AVAIL_FREQ_PATH, dev_num);
+
+ if (sysfs_read_str(avail_sysfs_path, freqs_buf, sizeof(freqs_buf)) < 0) {
+ /* If poll mode sensor */
+ if (!sensor_info[s].num_channels) {
+ /* The must rate */
+ min_supported_rate = get_cdd_freq(s, 1);
+ }
+ } else {
+ cursor = freqs_buf;
+ while (*cursor && cursor[0]) {
+
+ /* Decode a single value */
+ sr = strtod(cursor, NULL);
+
+ if (sr < min_supported_rate)
+ min_supported_rate = sr;
+
+ /* Skip digits */
+ while (cursor[0] && !isspace(cursor[0]))
+ cursor++;
+
+ /* Skip spaces */
+ while (cursor[0] && isspace(cursor[0]))
+ cursor++;
+ }
+ }
+
+ /* return 0 for wrong values */
+ if (min_supported_rate < 0.1)
+ return 0;
+
+ /* Return microseconds */
+ return (max_delay_t)(1000000.0 / min_supported_rate);
+}
+
+/* this value depends on the reporting mode:
+ *
+ * continuous: minimum sample period allowed in microseconds
+ * on-change : 0
+ * one-shot :-1
+ * special : 0, unless otherwise noted
+ */
+int32_t sensor_get_min_delay(int s)
+{
+ char avail_sysfs_path[PATH_MAX];
+ int dev_num = sensor_info[s].dev_num;
+ char freqs_buf[100];
+ char* cursor;
+ float max_supported_rate = 0;
+ float sr;
+
+ /* continuous: minimum sampling period allowed in microseconds.
+ * on-change, special : 0
+ * one-shot :-1
+ */
+ if (REPORTING_MODE(sensor_desc[s].flags) == SENSOR_FLAG_ON_CHANGE_MODE ||
+ REPORTING_MODE(sensor_desc[s].flags) == SENSOR_FLAG_SPECIAL_REPORTING_MODE)
+ return 0;
+
+ if (REPORTING_MODE(sensor_desc[s].flags) == SENSOR_FLAG_ONE_SHOT_MODE)
+ return -1;
+
+ sprintf(avail_sysfs_path, DEVICE_AVAIL_FREQ_PATH, dev_num);
+
+ if (sysfs_read_str(avail_sysfs_path, freqs_buf, sizeof(freqs_buf)) < 0) {
+ /* If poll mode sensor */
+ if (!sensor_info[s].num_channels) {
+ /* The should rate */
+ max_supported_rate = get_cdd_freq(s, 0);
+ }
+ } else {
+ cursor = freqs_buf;
+ while (*cursor && cursor[0]) {
+
+ /* Decode a single value */
+ sr = strtod(cursor, NULL);
+
+ if (sr > max_supported_rate && sr <= MAX_EVENTS)
+ max_supported_rate = sr;
+
+ /* Skip digits */
+ while (cursor[0] && !isspace(cursor[0]))
+ cursor++;
+
+ /* Skip spaces */
+ while (cursor[0] && isspace(cursor[0]))
+ cursor++;
+ }
+ }
+
+ /* return 0 for wrong values */
+ if (max_supported_rate < 0.1)
+ return 0;
+
+ /* Return microseconds */
+ return (int32_t)(1000000.0 / max_supported_rate);
+}