PX4-Autopilot/src/modules/commander/PreflightCheck.cpp

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/**
* @file PreflightCheck.cpp
*
* Preflight check for main system components
*
* @author Lorenz Meier <lorenz@px4.io>
* @author Johan Jansen <jnsn.johan@gmail.com>
*/

#include <px4_config.h>
#include <px4_posix.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <math.h>
#include <poll.h>

#include <systemlib/err.h>
#include <systemlib/param/param.h>
#include <systemlib/rc_check.h>
#include <systemlib/mavlink_log.h>

#include <drivers/drv_hrt.h>
#include <drivers/drv_mag.h>
#include <drivers/drv_gyro.h>
#include <drivers/drv_accel.h>
#include <drivers/drv_baro.h>
#include <drivers/drv_airspeed.h>

#include <uORB/topics/airspeed.h>
#include <uORB/topics/differential_pressure.h>
#include <uORB/topics/estimator_status.h>
#include <uORB/topics/sensor_preflight.h>
#include <uORB/topics/vehicle_gps_position.h>

#include "PreflightCheck.h"

#include "DevMgr.hpp"

using namespace DriverFramework;

namespace Commander
{

static int check_calibration(DevHandle &h, const char *param_template, int &devid)
{
	bool calibration_found;

	/* new style: ask device for calibration state */
	int ret = h.ioctl(SENSORIOCCALTEST, 0);

	calibration_found = (ret == OK);

	devid = h.ioctl(DEVIOCGDEVICEID, 0);

	char s[20];
	int instance = 0;

	/* old style transition: check param values */
	while (!calibration_found) {
		sprintf(s, param_template, instance);
		param_t parm = param_find(s);

		/* if the calibration param is not present, abort */
		if (parm == PARAM_INVALID) {
			break;
		}

		/* if param get succeeds */
		int32_t calibration_devid;

		if (!param_get(parm, &(calibration_devid))) {

			/* if the devid matches, exit early */
			if (devid == calibration_devid) {
				calibration_found = true;
				break;
			}
		}
		instance++;
	}

	return !calibration_found;
}

static bool magnometerCheck(orb_advert_t *mavlink_log_pub, unsigned instance, bool optional, int &device_id, bool report_fail)
{
	bool success = true;

	char s[30];
	sprintf(s, "%s%u", MAG_BASE_DEVICE_PATH, instance);
	DevHandle h;
	DevMgr::getHandle(s, h);

	if (!h.isValid()) {
		if (!optional) {
			if (report_fail) {
				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: NO MAG SENSOR #%u", instance);
			}
		}

		return false;
	}

	int ret = check_calibration(h, "CAL_MAG%u_ID", device_id);

	if (ret) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: MAG #%u UNCALIBRATED", instance);
		}
		success = false;
		goto out;
	}

	ret = h.ioctl(MAGIOCSELFTEST, 0);

	if (ret != OK) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: MAG #%u SELFTEST FAILED", instance);
		}
		success = false;
		goto out;
	}

out:
	DevMgr::releaseHandle(h);
	return success;
}

static bool imuConsistencyCheck(orb_advert_t *mavlink_log_pub, bool report_status)
{
	bool success = true; // start with a pass and change to a fail if any test fails
	float test_limit = 1.0f; // pass limit re-used for each test

	// Get sensor_preflight data if available and exit with a fail recorded if not
	int sensors_sub = orb_subscribe(ORB_ID(sensor_preflight));
	sensor_preflight_s sensors = {};

	if (orb_copy(ORB_ID(sensor_preflight), sensors_sub, &sensors) != PX4_OK) {
		goto out;
	}

	// Use the difference between IMU's to detect a bad calibration.
	// If a single IMU is fitted, the value being checked will be zero so this check will always pass.
	param_get(param_find("COM_ARM_IMU_ACC"), &test_limit);
	if (sensors.accel_inconsistency_m_s_s > test_limit) {
		if (report_status) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: ACCELS INCONSISTENT - CHECK CAL");
		}

		success = false;
		goto out;

	} else if (sensors.accel_inconsistency_m_s_s > test_limit * 0.8f) {
		if (report_status) {
			mavlink_log_info(mavlink_log_pub, "PREFLIGHT ADVICE: ACCELS INCONSISTENT - CHECK CAL");
		}
	}

	// Fail if gyro difference greater than 5 deg/sec and notify if greater than 2.5 deg/sec
	param_get(param_find("COM_ARM_IMU_GYR"), &test_limit);
	if (sensors.gyro_inconsistency_rad_s > test_limit) {
		if (report_status) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: GYROS INCONSISTENT - CHECK CAL");
		}
		success = false;
		goto out;

	} else if (sensors.gyro_inconsistency_rad_s > test_limit * 0.5f) {
		if (report_status) {
			mavlink_log_info(mavlink_log_pub, "PREFLIGHT ADVICE: GYROS INCONSISTENT - CHECK CAL");
		}
	}

out:
	orb_unsubscribe(sensors_sub);
	return success;
}

// return false if the magnetomer measurements are inconsistent
static bool magConsistencyCheck(orb_advert_t *mavlink_log_pub, bool report_status)
{
	// get the sensor preflight data
	int sensors_sub = orb_subscribe(ORB_ID(sensor_preflight));
	struct sensor_preflight_s sensors = {};
	if (orb_copy(ORB_ID(sensor_preflight), sensors_sub, &sensors) != 0) {
		// can happen if not advertised (yet)
		return true;
	}
	orb_unsubscribe(sensors_sub);

	// Use the difference between sensors to detect a bad calibration, orientation or magnetic interference.
	// If a single sensor is fitted, the value being checked will be zero so this check will always pass.
	float test_limit;
	param_get(param_find("COM_ARM_MAG"), &test_limit);
	if (sensors.mag_inconsistency_ga > test_limit) {
		if (report_status) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: MAG SENSORS INCONSISTENT");
		}
		return false;
	}

	return true;
}

static bool accelerometerCheck(orb_advert_t *mavlink_log_pub, unsigned instance, bool optional, bool dynamic, int &device_id, bool report_fail)
{
	bool success = true;

	char s[30];
	sprintf(s, "%s%u", ACCEL_BASE_DEVICE_PATH, instance);
	DevHandle h;
	DevMgr::getHandle(s, h);

	if (!h.isValid()) {
		if (!optional) {
			if (report_fail) {
				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: NO ACCEL SENSOR #%u", instance);
			}
		}

		return false;
	}

	int ret = check_calibration(h, "CAL_ACC%u_ID", device_id);

	if (ret) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: ACCEL #%u UNCALIBRATED", instance);
		}
		success = false;
		goto out;
	}

	ret = h.ioctl(ACCELIOCSELFTEST, 0);

	if (ret != OK) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: ACCEL #%u TEST FAILED: %d", instance, ret);
		}
		success = false;
		goto out;
	}

#ifdef __PX4_NUTTX
	if (dynamic) {
		/* check measurement result range */
		struct accel_report acc;
		ret = h.read(&acc, sizeof(acc));

		if (ret == sizeof(acc)) {
			/* evaluate values */
			float accel_magnitude = sqrtf(acc.x * acc.x + acc.y * acc.y + acc.z * acc.z);

			if (accel_magnitude < 4.0f || accel_magnitude > 15.0f /* m/s^2 */) {
				if (report_fail) {
					mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: ACCEL RANGE, hold still on arming");
				}
				/* this is frickin' fatal */
				success = false;
				goto out;
			}
		} else {
			if (report_fail) {
				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: ACCEL READ");
			}
			/* this is frickin' fatal */
			success = false;
			goto out;
		}
	}
#endif

out:
	DevMgr::releaseHandle(h);
	return success;
}

static bool gyroCheck(orb_advert_t *mavlink_log_pub, unsigned instance, bool optional, int &device_id, bool report_fail)
{
	bool success = true;

	char s[30];
	sprintf(s, "%s%u", GYRO_BASE_DEVICE_PATH, instance);
	DevHandle h;
	DevMgr::getHandle(s, h);

	if (!h.isValid()) {
		if (!optional) {
			if (report_fail) {
				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: NO GYRO SENSOR #%u", instance);
			}
		}

		return false;
	}

	int ret = check_calibration(h, "CAL_GYRO%u_ID", device_id);

	if (ret) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: GYRO #%u UNCALIBRATED", instance);
		}
		success = false;
		goto out;
	}

	ret = h.ioctl(GYROIOCSELFTEST, 0);

	if (ret != OK) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: GYRO #%u SELFTEST FAILED", instance);
		}
		success = false;
		goto out;
	}

out:
	DevMgr::releaseHandle(h);
	return success;
}

static bool baroCheck(orb_advert_t *mavlink_log_pub, unsigned instance, bool optional, int &device_id, bool report_fail)
{
	bool success = true;

	char s[30];
	sprintf(s, "%s%u", BARO_BASE_DEVICE_PATH, instance);
	DevHandle h;
	DevMgr::getHandle(s, h);

	if (!h.isValid()) {
		if (!optional) {
			if (report_fail) {
				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: NO BARO SENSOR #%u", instance);
			}
		}

		return false;
	}

	device_id = -1000;

	// TODO: There is no baro calibration yet, since no external baros exist
	// int ret = check_calibration(fd, "CAL_BARO%u_ID");

	// if (ret) {
	// 	mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: BARO #%u UNCALIBRATED", instance);
	// 	success = false;
	// 	goto out;
	// }

//out:

	DevMgr::releaseHandle(h);
	return success;
}

static bool airspeedCheck(orb_advert_t *mavlink_log_pub, bool optional, bool report_fail, bool prearm)
{
	bool success = true;

	int fd_airspeed = orb_subscribe(ORB_ID(airspeed));
	airspeed_s airspeed = {};

	int fd_diffpres = orb_subscribe(ORB_ID(differential_pressure));
	differential_pressure_s differential_pressure = {};

	if ((orb_copy(ORB_ID(differential_pressure), fd_diffpres, &differential_pressure) != PX4_OK) ||
	    (hrt_elapsed_time(&differential_pressure.timestamp) > 1000000)) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: AIRSPEED SENSOR MISSING");
		}
		success = false;
		goto out;
	}

	if ((orb_copy(ORB_ID(airspeed), fd_airspeed, &airspeed) != PX4_OK) ||
	    (hrt_elapsed_time(&airspeed.timestamp) > 1000000)) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: AIRSPEED SENSOR MISSING");
		}
		success = false;
		goto out;
	}

	/*
	 * Check if voter thinks the confidence is low. High-end sensors might have virtually zero noise
	 * on the bench and trigger false positives of the voter. Therefore only fail this
	 * for a pre-arm check, as then the cover is off and the natural airflow in the field
	 * will ensure there is not zero noise.
	 */
	if (prearm && fabsf(airspeed.confidence) < 0.95f) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: AIRSPEED SENSOR STUCK");
		}
		success = false;
		goto out;
	}

	/**
	 * Check if differential pressure is off by more than 15Pa which equals ~5m/s when measuring no airspeed.
	 * Negative and positive offsets are considered. Do not check anymore while arming because pitot cover
	 * might have been removed.
	 */
	if (fabsf(differential_pressure.differential_pressure_filtered_pa) > 15.0f && !prearm) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: CHECK AIRSPEED CAL OR PITOT");
		}
		success = false;
		goto out;
	}

out:
	orb_unsubscribe(fd_airspeed);
	orb_unsubscribe(fd_diffpres);
	return success;
}

static bool gnssCheck(orb_advert_t *mavlink_log_pub, bool report_fail, bool &lock_detected)
{
	bool success = true;
	lock_detected = false;
	int gpsSub = orb_subscribe(ORB_ID(vehicle_gps_position));

	//Wait up to 2000ms to allow the driver to detect a GNSS receiver module
	px4_pollfd_struct_t fds[1];
	fds[0].fd = gpsSub;
	fds[0].events = POLLIN;

	if (px4_poll(fds, 1, 2000) <= 0) {
		success = false;

	} else {
		struct vehicle_gps_position_s gps;

		if ((OK != orb_copy(ORB_ID(vehicle_gps_position), gpsSub, &gps)) ||
		    (hrt_elapsed_time(&gps.timestamp) > 1000000)) {
			success = false;
		} else if (gps.fix_type >= 3) {
			lock_detected = true;
		}
	}

	//Report failure to detect module
	if (!success) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: GPS RECEIVER MISSING");
		}
	}

	orb_unsubscribe(gpsSub);
	return success;
}

static bool ekf2Check(orb_advert_t *mavlink_log_pub, bool optional, bool report_fail, bool enforce_gps_required)
{
	bool success = true; // start with a pass and change to a fail if any test fails
	float test_limit = 1.0f; // pass limit re-used for each test

	// Get estimator status data if available and exit with a fail recorded if not
	int sub = orb_subscribe(ORB_ID(estimator_status));
	estimator_status_s status = {};

	if (orb_copy(ORB_ID(estimator_status), sub, &status) != PX4_OK) {
		goto out;
	}

	// Check if preflight check perfomred by estimator has failed
	if (status.pre_flt_fail) {
		success = false;
		goto out;
	}

	// check vertical position innovation test ratio
	param_get(param_find("COM_ARM_EKF_HGT"), &test_limit);
	if (status.hgt_test_ratio > test_limit) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: EKF HGT ERROR");
		}
		success = false;
		goto out;
	}

	// check velocity innovation test ratio
	param_get(param_find("COM_ARM_EKF_VEL"), &test_limit);
	if (status.vel_test_ratio > test_limit) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: EKF VEL ERROR");
		}
		success = false;
		goto out;
	}

	// check horizontal position innovation test ratio
	param_get(param_find("COM_ARM_EKF_POS"), &test_limit);
	if (status.pos_test_ratio > test_limit) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: EKF HORIZ POS ERROR");
		}
		success = false;
		goto out;
	}

	// If GPS aiding is required, declare fault condition if the EKF is not using GPS
	if (enforce_gps_required) {
		bool ekf_gps_fusion = status.control_mode_flags & (1 << 2);
		if (!ekf_gps_fusion) {
			if (report_fail) {
				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: EKF NOT USING GPS");
			}
			success = false;
			goto out;
		}
	}

	// If GPS aiding is required, declare fault condition if the required GPS quality checks are failing
	if (enforce_gps_required) {
		if ((status.gps_check_fail_flags & ((1 << estimator_status_s::GPS_CHECK_FAIL_MIN_SAT_COUNT)
						    + (1 << estimator_status_s::GPS_CHECK_FAIL_MIN_GDOP)
						    + (1 << estimator_status_s::GPS_CHECK_FAIL_MAX_HORZ_ERR)
						    + (1 << estimator_status_s::GPS_CHECK_FAIL_MAX_VERT_ERR))) > 0) {
			if (report_fail) {
				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: GPS QUALITY CHECKS");
			}
			success = false;
			goto out;
		}
	}

	// check magnetometer innovation test ratio
	param_get(param_find("COM_ARM_EKF_YAW"), &test_limit);
	if (status.mag_test_ratio > test_limit) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: EKF YAW ERROR");
		}
		success = false;
		goto out;
	}

	// check accelerometer delta velocity bias estimates
	param_get(param_find("COM_ARM_EKF_AB"), &test_limit);
	if (fabsf(status.states[13]) > test_limit || fabsf(status.states[14]) > test_limit || fabsf(status.states[15]) > test_limit) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: EKF HIGH IMU ACCEL BIAS");
		}
		success = false;
		goto out;
	}

	// check gyro delta angle bias estimates
	param_get(param_find("COM_ARM_EKF_GB"), &test_limit);
	if (fabsf(status.states[10]) > test_limit || fabsf(status.states[11]) > test_limit || fabsf(status.states[12]) > test_limit) {
		if (report_fail) {
			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: EKF HIGH IMU GYRO BIAS");
		}
		success = false;
		goto out;
	}

out:
	orb_unsubscribe(sub);
	return success;
}

bool preflightCheck(orb_advert_t *mavlink_log_pub, bool checkSensors, bool checkAirspeed, bool checkRC, bool checkGNSS,
		    bool checkDynamic, bool isVTOL, bool reportFailures, bool prearm, hrt_abstime time_since_boot)
{

	if (time_since_boot < 2000000) {
		// the airspeed driver filter doesn't deliver the actual value yet
		return true;
	}

#ifdef __PX4_QURT
	// WARNING: Preflight checks are important and should be added back when
	// all the sensors are supported
	PX4_WARN("Preflight checks always pass on Snapdragon.");
	checkSensors = false;
#elif defined(__PX4_POSIX_RPI)
	PX4_WARN("Preflight checks for mag, acc, gyro always pass on RPI");
	checkSensors = false;
#elif defined(__PX4_POSIX_BEBOP)
	PX4_WARN("Preflight checks always pass on Bebop.");
	checkSensors = false;
#elif defined(__PX4_POSIX_OCPOC)
	PX4_WARN("Preflight checks always pass on OcPoC.");
	checkSensors = false;
#endif

	bool failed = false;

	/* ---- MAG ---- */
	if (checkSensors) {
		bool prime_found = false;
		int32_t prime_id = 0;
		param_get(param_find("CAL_MAG_PRIME"), &prime_id);

		/* check all sensors, but fail only for mandatory ones */
		for (unsigned i = 0; i < max_optional_mag_count; i++) {
			bool required = (i < max_mandatory_mag_count);
			int device_id = -1;

			if (!magnometerCheck(mavlink_log_pub, i, !required, device_id, reportFailures) && required) {
				failed = true;
			}

			if (device_id == prime_id) {
				prime_found = true;
			}
		}

		/* check if the primary device is present */
		if (!prime_found && prime_id != 0) {
			if (reportFailures) {
				mavlink_log_critical(mavlink_log_pub, "Warning: Primary compass not found");
			}
			failed = true;
		}

		/* fail if mag sensors are inconsistent */
		if (!magConsistencyCheck(mavlink_log_pub, reportFailures)) {
			failed = true;
		}

	}

	/* ---- ACCEL ---- */
	if (checkSensors) {
		bool prime_found = false;
		int32_t prime_id = 0;
		param_get(param_find("CAL_ACC_PRIME"), &prime_id);

		/* check all sensors, but fail only for mandatory ones */
		for (unsigned i = 0; i < max_optional_accel_count; i++) {
			bool required = (i < max_mandatory_accel_count);
			int device_id = -1;

			if (!accelerometerCheck(mavlink_log_pub, i, !required, checkDynamic, device_id, reportFailures) && required) {
				failed = true;
			}

			if (device_id == prime_id) {
				prime_found = true;
			}
		}

		/* check if the primary device is present */
		if (!prime_found && prime_id != 0) {
			if (reportFailures) {
				mavlink_log_critical(mavlink_log_pub, "Warning: Primary accelerometer not found");
			}
			failed = true;
		}
	}

	/* ---- GYRO ---- */
	if (checkSensors) {
		bool prime_found = false;
		int32_t prime_id = 0;
		param_get(param_find("CAL_GYRO_PRIME"), &prime_id);

		/* check all sensors, but fail only for mandatory ones */
		for (unsigned i = 0; i < max_optional_gyro_count; i++) {
			bool required = (i < max_mandatory_gyro_count);
			int device_id = -1;

			if (!gyroCheck(mavlink_log_pub, i, !required, device_id, reportFailures) && required) {
				failed = true;
			}

			if (device_id == prime_id) {
				prime_found = true;
			}
		}

		/* check if the primary device is present */
		if (!prime_found && prime_id != 0) {
			if (reportFailures) {
				mavlink_log_critical(mavlink_log_pub, "Warning: Primary gyro not found");
			}
			failed = true;
		}
	}

	/* ---- BARO ---- */
	if (checkSensors) {
		bool prime_found = false;
		int32_t prime_id = 0;
		param_get(param_find("CAL_BARO_PRIME"), &prime_id);

		/* check all sensors, but fail only for mandatory ones */
		for (unsigned i = 0; i < max_optional_baro_count; i++) {
			bool required = (i < max_mandatory_baro_count);
			int device_id = -1;

			if (!baroCheck(mavlink_log_pub, i, !required, device_id, reportFailures) && required) {
				failed = true;
			}

			if (device_id == prime_id) {
				prime_found = true;
			}
		}

		// TODO there is no logic in place to calibrate the primary baro yet
		// // check if the primary device is present
		if (!prime_found && prime_id != 0) {
			if (reportFailures) {
				mavlink_log_critical(mavlink_log_pub, "warning: primary barometer not operational");
			}
			failed = true;
		}
	}

	/* ---- IMU CONSISTENCY ---- */
	if (checkSensors) {
		if (!imuConsistencyCheck(mavlink_log_pub, reportFailures)) {
			failed = true;
		}
	}

	/* ---- AIRSPEED ---- */
	if (checkAirspeed) {
		if (!airspeedCheck(mavlink_log_pub, true, reportFailures, prearm)) {
			failed = true;
		}
	}

	/* ---- RC CALIBRATION ---- */
	if (checkRC) {
		if (rc_calibration_check(mavlink_log_pub, reportFailures, isVTOL) != OK) {
			if (reportFailures) {
				mavlink_log_critical(mavlink_log_pub, "RC calibration check failed");
			}
			failed = true;
		}
	}

	/* ---- Global Navigation Satellite System receiver ---- */
	static hrt_abstime _time_last_no_gps_lock = 0;
	if (checkGNSS) {
		bool lock_detected = false;
		if (!gnssCheck(mavlink_log_pub, reportFailures, lock_detected)) {
			failed = true;
		}
		if (!lock_detected) {
			_time_last_no_gps_lock = time_since_boot;
		}
	}

	/* ---- Navigation EKF ---- */
	// only check EKF2 data if EKF2 is selected as the estimator and GNSS checking is enabled
	int32_t estimator_type;
	param_get(param_find("SYS_MC_EST_GROUP"), &estimator_type);
	if (estimator_type == 2 && checkGNSS) {
		// don't fail if not using GPS for the first 20s after gaining 3D lock because quality checks take time to pass
		bool enforce_gps_required = (_time_last_no_gps_lock > 20 * 1000000);

		if (!ekf2Check(mavlink_log_pub, true, reportFailures, enforce_gps_required)) {
			failed = true;
		}
	}

	/* Report status */
	return !failed;
}

}