Update GPS HAL to accept raw data.
Change-Id: Id487c2f9eb4bc95d89dc0fba1332f666ae332ee0
diff --git a/include/hardware/gps.h b/include/hardware/gps.h
index 7244738..3cb006b 100644
--- a/include/hardware/gps.h
+++ b/include/hardware/gps.h
@@ -22,6 +22,7 @@
#include <sys/types.h>
#include <pthread.h>
#include <sys/socket.h>
+#include <stdbool.h>
#include <hardware/hardware.h>
@@ -39,6 +40,9 @@
/** Maximum number of SVs for gps_sv_status_callback(). */
#define GPS_MAX_SVS 32
+/** Maximum number of Measurements in gps_measurement_callback(). */
+#define GPS_MAX_MEASUREMENT 32
+
/** Requested operational mode for GPS operation. */
typedef uint32_t GpsPositionMode;
// IMPORTANT: Note that the following values must match
@@ -213,6 +217,102 @@
#define AGPS_RIL_NETWORK_TTYPE_WIMAX 6
/**
+ * Flags to indicate what fields in GpsClock are valid.
+ */
+typedef uint16_t GpsClockFlags;
+/** A valid 'leap second' is stored in the data structure. */
+#define GPS_CLOCK_HAS_LEAP_SECOND (1<<0)
+/** A valid 'time uncertainty' is stored in the data structure. */
+#define GPS_CLOCK_HAS_TIME_UNCERTAINTY (1<<1)
+/** A valid 'bias' is stored in the data structure. */
+#define GPS_CLOCK_HAS_BIAS (1<<2)
+/** A valid 'bias uncertainty' is stored in the data structure. */
+#define GPS_CLOCK_HAS_BIAS_UNCERTAINTY (1<<3)
+/** A valid 'drift' is stored in the data structure. */
+#define GPS_CLOCK_HAS_DRIFT (1<<4)
+/** A valid 'drift uncertainty' is stored in the data structure. */
+#define GPS_CLOCK_HAS_DRIFT_UNCERTAINTY (1<<5)
+
+/**
+ * Flags to indicate what fields in GpsMeasurement are valid.
+ */
+typedef uint32_t GpsMeasurementFlags;
+/** A valid 'snr' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_SNR (1<<0)
+/** A valid 'elevation' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_ELEVATION (1<<1)
+/** A valid 'elevation uncertainty' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_ELEVATION_UNCERTAINTY (1<<2)
+/** A valid 'azimuth' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_AZIMUTH (1<<3)
+/** A valid 'azimuth uncertainty' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_AZIMUTH_UNCERTAINTY (1<<4)
+/** A valid 'pseudorange' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_PSEUDORANGE (1<<5)
+/** A valid 'pseudorange uncertainty' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_PSEUDORANGE_UNCERTAINTY (1<<6)
+/** A valid 'code phase' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_CODE_PHASE (1<<7)
+/** A valid 'code phase uncertainty' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_CODE_PHASE_UNCERTAINTY (1<<8)
+/** A valid 'carrier frequency' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_CARRIER_FREQUENCY (1<<9)
+/** A valid 'carrier cycles' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_CARRIER_CYCLES (1<<10)
+/** A valid 'carrier phase' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_CARRIER_PHASE (1<<11)
+/** A valid 'carrier phase uncertainty' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_CARRIER_PHASE_UNCERTAINTY (1<<12)
+/** A valid 'bit number' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_BIT_NUMBER (1<<13)
+/** A valid 'time from last bit' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_TIME_FROM_LAST_BIT (1<<14)
+/** A valid 'doppler shift' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_DOPPLER_SHIFT (1<<15)
+/** A valid 'doppler shift uncertainty' is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_DOPPLER_SHIFT_UNCERTAINTY (1<<16)
+/** A valid 'used in fix' flag is stored in the data structure. */
+#define GPS_MEASUREMENT_HAS_USED_IN_FIX (1<<17)
+
+/**
+ * Flags that indicate the available values for the GPS Measurement's loss of lock.
+ */
+typedef uint8_t GpsLossOfLock;
+/** The indicator is not available or it is unknown. */
+#define GPS_LOSS_OF_LOCK_UNKNOWN 0
+/** The measurement does not present any indication of loss of lock. */
+#define GPS_LOSS_OF_LOCK_OK 1
+/** Loss of lock between previous and current observation: cycle slip possible. */
+#define GPS_LOSS_OF_LOCK_CYCLE_SLIP 2
+
+/**
+ * Flags that indicate the available values for the GPS Measurement's multipath indicator.
+ */
+typedef uint8_t GpsMultipathIndicator;
+/** The indicator is not available or unknown. */
+#define GPS_MULTIPATH_INDICATOR_UNKNOWN 0
+/** The measurement has been indicated to use multipath. */
+#define GPS_MULTIPATH_INDICATOR_DETECTED 1
+/** The measurement has been indicated Not to use multipath. */
+#define GPS_MULTIPATH_INDICATOR_NOT_USED 2
+
+/**
+ * Flags to indicate the available GPS Natigation message types.
+ */
+typedef uint8_t GpsNavigationMessageType;
+/** The message type is unknown. */
+#define GPS_NAVIGATION_MESSAGE_TYPE_UNKNOWN 0
+/** L1 C/A message contained in the structure. */
+#define GPS_NAVIGATION_MESSAGE_TYPE_L1CA 1
+/** L2-CNAV message contained in the structure. */
+#define GPS_NAVIGATION_MESSAGE_TYPE_L2CNAV 2
+/** L5-CNAV message contained in the structure. */
+#define GPS_NAVIGATION_MESSAGE_TYPE_L5CNAV 3
+/** CNAV-2 message contained in the structure. */
+#define GPS_NAVIGATION_MESSAGE_TYPE_CNAV2 4
+
+
+/**
* Name for the GPS XTRA interface.
*/
#define GPS_XTRA_INTERFACE "gps-xtra"
@@ -247,6 +347,16 @@
*/
#define GPS_GEOFENCING_INTERFACE "gps_geofencing"
+/**
+ * Name of the GPS Measurements interface.
+ */
+#define GPS_MEASUREMENT_INTERFACE "gps_measurement"
+
+/**
+ * Name of the GPS navigation message interface.
+ */
+ #define GPS_NAVIGATION_MESSAGE_INTERFACE "gps_navigation_message"
+
/** Represents a location. */
typedef struct {
@@ -320,6 +430,7 @@
uint32_t used_in_fix_mask;
} GpsSvStatus;
+
/* 2G and 3G */
/* In 3G lac is discarded */
typedef struct {
@@ -353,8 +464,9 @@
*/
typedef void (* gps_status_callback)(GpsStatus* status);
-/** Callback with SV status information.
- * Can only be called from a thread created by create_thread_cb.
+/**
+ * Callback with SV status information.
+ * Can only be called from a thread created by create_thread_cb.
*/
typedef void (* gps_sv_status_callback)(GpsSvStatus* sv_info);
@@ -406,7 +518,7 @@
size_t size;
/**
* Opens the interface and provides the callback routines
- * to the implemenation of this interface.
+ * to the implementation of this interface.
*/
int (*init)( GpsCallbacks* callbacks );
@@ -467,7 +579,7 @@
size_t size;
/**
* Opens the XTRA interface and provides the callback routines
- * to the implemenation of this interface.
+ * to the implementation of this interface.
*/
int (*init)( GpsXtraCallbacks* callbacks );
/** Injects XTRA data into the GPS. */
@@ -547,7 +659,7 @@
/**
* Opens the AGPS interface and provides the callback routines
- * to the implemenation of this interface.
+ * to the implementation of this interface.
*/
void (*init)( AGpsCallbacks* callbacks );
/**
@@ -631,7 +743,7 @@
u_char data[20];
} Sha1CertificateFingerprint;
-/** AGPS Inteface to handle SUPL certificate operations */
+/** AGPS Interface to handle SUPL certificate operations */
typedef struct {
/** set to sizeof(SuplCertificateInterface) */
size_t size;
@@ -803,7 +915,7 @@
size_t size;
/**
* Opens the AGPS interface and provides the callback routines
- * to the implemenation of this interface.
+ * to the implementation of this interface.
*/
void (*init)( AGpsRilCallbacks* callbacks );
@@ -942,7 +1054,7 @@
int32_t transition, GpsUtcTime timestamp);
/**
- * The callback associated with the availablity of the GPS system for geofencing
+ * The callback associated with the availability of the GPS system for geofencing
* monitoring. If the GPS system determines that it cannot monitor geofences
* because of lack of reliability or unavailability of the GPS signals, it will
* call this callback with GPS_GEOFENCE_UNAVAILABLE parameter.
@@ -1020,7 +1132,7 @@
/**
* Opens the geofence interface and provides the callback routines
- * to the implemenation of this interface.
+ * to the implementation of this interface.
*/
void (*init)( GpsGeofenceCallbacks* callbacks );
@@ -1050,14 +1162,12 @@
* sampling the GPS for power-saving reasons; thus the rate of
* sampling may be faster or slower than this.
* unknown_timer_ms - The time limit after which the UNCERTAIN transition
- * should be triggered. This paramter is defined in milliseconds.
+ * should be triggered. This parameter is defined in milliseconds.
* See above for a detailed explanation.
*/
- void (*add_geofence_area) (int32_t geofence_id, double latitude,
- double longitude, double radius_meters,
- int last_transition, int monitor_transitions,
- int notification_responsiveness_ms,
- int unknown_timer_ms);
+ void (*add_geofence_area) (int32_t geofence_id, double latitude, double longitude,
+ double radius_meters, int last_transition, int monitor_transitions,
+ int notification_responsiveness_ms, int unknown_timer_ms);
/**
* Pause monitoring a particular geofence.
@@ -1086,6 +1196,471 @@
*/
void (*remove_geofence_area) (int32_t geofence_id);
} GpsGeofencingInterface;
+
+
+/**
+ * Represents an estimate of the GPS clock time.
+ */
+typedef struct {
+ /** set to sizeof(GpsClock) */
+ size_t size;
+
+ /** A set of flags indicating the validity of the fields in this data structure. */
+ GpsClockFlags flags;
+
+ /**
+ * Leap second data.
+ * If the data is available 'flags' must contain GPS_CLOCK_HAS_LEAP_SECOND.
+ */
+ int16_t leap_second;
+
+ /**
+ * The receiver's GPS time since 0000Z, January 6, 1980 in nanoseconds.
+ * It is referenced using the uncorrected receiver's clock ('bias_ns' included).
+ * The current precision allows a range that spans approximately to the end of the year 2272.
+ *
+ * Sub-nanosecond accuracy can be provided for each individual measurement using the field
+ * GpsMeasurement::time_offset_ns.
+ *
+ * The value contains the 'time uncertainty' in it.
+ * This is a Mandatory field.
+ */
+ int64_t time_ns;
+
+ /**
+ * 1-Sigma uncertainty associated with the clock's time in nanoseconds.
+ * The uncertainty is represented as an absolute (single sided) value.
+ *
+ * If the data is available 'flags' must contain GPS_CLOCK_HAS_TIME_UNCERTAINTY.
+ */
+ double time_uncertainty_ns;
+
+ /**
+ * The clock's bias in nanoseconds.
+ * The sign of the value is defined by the following equation:
+ * true time = time - bias.
+ *
+ * The value contains the 'bias uncertainty' in it.
+ * If the data is available 'flags' must contain GPS_CLOCK_HAS_BIAS.
+ */
+ double bias_ns;
+
+ /**
+ * 1-Sigma uncertainty associated with the clock's bias in nanoseconds.
+ * The uncertainty is represented as an absolute (single sided) value.
+ *
+ * If the data is available 'flags' must contain GPS_CLOCK_HAS_BIAS_UNCERTAINTY.
+ */
+ double bias_uncertainty_ns;
+
+ /**
+ * The clock's drift in nanoseconds (per second).
+ * A positive value means that the frequency is higher than the nominal frequency.
+ *
+ * The value contains the 'drift uncertainty' in it.
+ * If the data is available 'flags' must contain GPS_CLOCK_HAS_DRIFT.
+ */
+ double drift_nsps;
+
+ /**
+ * 1-Sigma uncertainty associated with the clock's drift in nanoseconds (per second).
+ * The uncertainty is represented as an absolute (single sided) value.
+ *
+ * If the data is available 'flags' must contain GPS_CLOCK_HAS_DRIFT_UNCERTAINTY.
+ */
+ double drift_uncertainty_nsps;
+} GpsClock;
+
+/**
+ * Represents a GPS Measurement, it contains raw and computed information.
+ */
+typedef struct {
+ /** set to sizeof(GpsMeasurement) */
+ size_t size;
+
+ /** A set of flags indicating the validity of the fields in this data structure. */
+ GpsMeasurementFlags flags;
+
+ /**
+ * Pseudo-random number in the range of [1, 32]
+ * This is a Mandatory value.
+ */
+ int8_t prn;
+
+ /**
+ * Local hardware time offset at which the measurement was taken in nanoseconds.
+ * The reference receiver's time is specified by GpsData::clock.
+ * The sign of time_offset_ns is given by the following equation:
+ * measurement time = GpsClock::time_ns + time_offset_ns
+ *
+ * It provides an individual time-stamp for the measurement, and allows sub-nanosecond accuracy.
+ * This is a Mandatory value.
+ */
+ int64_t time_offset_ns;
+
+ /**
+ * Received GPS Time-of-Week in nanoseconds.
+ * The value is relative to the beginning of the current GPS week.
+ *
+ * This is a Mandatory value.
+ */
+ int64_t received_gps_tow_ns;
+
+ /**
+ * Carrier-to-noise density in dB-Hz, in the range [0, 63].
+ * It contains the measured C/N0 value for the signal at the antenna input.
+ *
+ * This is a Mandatory value.
+ */
+ double c_n0_dbhz;
+
+ /**
+ * Pseudorange rate at the timestamp in m/s.
+ * The value also includes the effects of the receiver clock frequency and satellite clock
+ * frequency errors.
+ *
+ * The value includes the 'pseudorange rate uncertainty' in it.
+ * A positive value indicates that the pseudorange is getting larger.
+ *
+ * This is a Mandatory value.
+ */
+ double pseudorange_rate_mpersec;
+
+ /**
+ * 1-Sigma uncertainty of the pseudurange rate in m/s.
+ * The uncertainty is represented as an absolute (single sided) value.
+ *
+ * This is a Mandatory value.
+ */
+ double pseudorange_rate_uncertainty_mpersec;
+
+ /**
+ * Accumulated delta range since the last channel reset in meters.
+ *
+ * This is a Mandatory value.
+ */
+ double accumulated_delta_range_m;
+
+ /**
+ * 1-Sigma uncertainty of the accumulated delta range in meters.
+ *
+ * This is a Mandatory value.
+ */
+ double accumulated_delta_range_uncertainty_m;
+
+ /**
+ * Best derived Pseudorange by the chip-set, in meters.
+ * The value contains the 'pseudorange uncertainty' in it.
+ *
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_PSEUDORANGE.
+ */
+ double pseudorange_m;
+
+ /**
+ * 1-Sigma uncertainty of the pseudorange in meters.
+ * The value contains the 'pseudorange' and 'clock' uncertainty in it.
+ * The uncertainty is represented as an absolute (single sided) value.
+ *
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_PSEUDORANGE_UNCERTAINTY.
+ */
+ double pseudorange_uncertainty_m;
+
+ /**
+ * A fraction of the current C/A code cycle, in the range [0.0, 1023.0]
+ * This value contains the time (in Chip units) since the last C/A code cycle (GPS Msec epoch).
+ *
+ * The reference frequency is given by the field 'carrier_frequency_hz'.
+ * The value contains the 'code-phase uncertainty' in it.
+ *
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_CODE_PHASE.
+ */
+ double code_phase_chips;
+
+ /**
+ * 1-Sigma uncertainty of the code-phase, in a fraction of chips.
+ * The uncertainty is represented as an absolute (single sided) value.
+ *
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_CODE_PHASE_UNCERTAINTY.
+ */
+ double code_phase_uncertainty_chips;
+
+ /**
+ * Carrier frequency at which codes and messages are modulated, it can be L1 or L2.
+ * If the field is not set, the carrier frequency is assumed to be L1.
+ *
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_CARRIER_FREQUENCY.
+ */
+ float carrier_frequency_hz;
+
+ /**
+ * The number of full carrier cycles between the satellite and the receiver.
+ * The reference frequency is given by the field 'carrier_frequency_hz'.
+ *
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_CARRIER_CYCLES.
+ */
+ int64_t carrier_cycles;
+
+ /**
+ * The RF phase detected by the receiver, in the range [0.0, 1.0].
+ * This is usually the fractional part of the complete carrier phase measurement.
+ *
+ * The reference frequency is given by the field 'carrier_frequency_hz'.
+ * The value contains the 'carrier-phase uncertainty' in it.
+ *
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_CARRIER_PHASE.
+ */
+ double carrier_phase;
+
+ /**
+ * 1-Sigma uncertainty of the carrier-phase.
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_CARRIER_PHASE_UNCERTAINTY.
+ */
+ double carrier_phase_uncertainty;
+
+ /**
+ * An enumeration that indicates the 'loss of lock' state of the event.
+ */
+ GpsLossOfLock loss_of_lock;
+
+ /**
+ * The number of GPS bits transmitted since Sat-Sun midnight (GPS week).
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_BIT_NUMBER.
+ */
+ int16_t bit_number;
+
+ /**
+ * The elapsed time since the last received bit in nanoseconds, in the range [0, 20,000,000]
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_TIME_FROM_LAST_BIT.
+ */
+ int64_t time_from_last_bit_ns;
+
+ /**
+ * Doppler shift in Hz.
+ * A positive value indicates that the SV is moving toward the receiver.
+ *
+ * The reference frequency is given by the field 'carrier_frequency_hz'.
+ * The value contains the 'doppler shift uncertainty' in it.
+ *
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_DOPPLER_SHIFT.
+ */
+ double doppler_shift_hz;
+
+ /**
+ * 1-Sigma uncertainty of the doppler shift in Hz.
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_DOPPLER_SHIFT_UNCERTAINTY.
+ */
+ double doppler_shift_uncertainty_hz;
+
+ /**
+ * An enumeration that indicates the 'multipath' state of the event.
+ */
+ GpsMultipathIndicator multipath_indicator;
+
+ /**
+ * Signal-to-noise ratio in dB.
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_SNR.
+ */
+ double snr_db;
+
+ /**
+ * Elevation in degrees, the valid range is [-90, 90].
+ * The value contains the 'elevation uncertainty' in it.
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_ELEVATION.
+ */
+ double elevation_deg;
+
+ /**
+ * 1-Sigma uncertainty of the elevation in degrees, the valid range is [0, 90].
+ * The uncertainty is represented as the absolute (single sided) value.
+ *
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_ELEVATION_UNCERTAINTY.
+ */
+ double elevation_uncertainty_deg;
+
+ /**
+ * Azimuth in degrees, in the range [0, 360).
+ * The value contains the 'azimuth uncertainty' in it.
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_AZIMUTH.
+ * */
+ double azimuth_deg;
+
+ /**
+ * 1-Sigma uncertainty of the azimuth in degrees, the valid range is [0, 180].
+ * The uncertainty is represented as an absolute (single sided) value.
+ *
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_AZIMUTH_UNCERTAINTY.
+ */
+ double azimuth_uncertainty_deg;
+
+ /**
+ * Whether the GPS represented by the measurement was used for computing the most recent fix.
+ * If the data is available, 'flags' must contain GPS_MEASUREMENT_HAS_USED_IN_FIX.
+ */
+ bool used_in_fix;
+} GpsMeasurement;
+
+/** Represents a reading of GPS measurements. */
+typedef struct {
+ /** set to sizeof(GpsData) */
+ size_t size;
+
+ /** Number of measurements. */
+ size_t measurement_count;
+
+ /** The array of measurements. */
+ GpsMeasurement measurements[GPS_MAX_MEASUREMENT];
+
+ /** The GPS clock time reading. */
+ GpsClock clock;
+} GpsData;
+
+/**
+ * The callback for to report measurements from the HAL.
+ *
+ * Parameters:
+ * data - A data structure containing the measurements.
+ */
+typedef void (*gps_measurement_callback) (GpsData* data);
+
+typedef struct {
+ /** set to sizeof(GpsMeasurementCallbacks) */
+ size_t size;
+ gps_measurement_callback measurement_callback;
+} GpsMeasurementCallbacks;
+
+#define GPS_MEASUREMENT_OPERATION_SUCCESS 0
+#define GPS_MEASUREMENT_ERROR_ALREADY_INIT -100
+#define GPS_MEASUREMENT_ERROR_GENERIC -101
+
+/**
+ * Extended interface for GPS Measurements support.
+ */
+typedef struct {
+ /** Set to sizeof(GpsMeasurementInterface) */
+ size_t size;
+
+ /**
+ * Initializes the interface and registers the callback routines with the HAL.
+ * After a successful call to 'init' the HAL must begin to provide updates at its own phase.
+ *
+ * Status:
+ * GPS_MEASUREMENT_OPERATION_SUCCESS
+ * GPS_MEASUREMENT_ERROR_ALREADY_INIT - if a callback has already been registered without a
+ * corresponding call to 'close'
+ * GPS_MEASUREMENT_ERROR_GENERIC - if any other error occurred, it is expected that the HAL
+ * will not generate any updates upon returning this error code.
+ */
+ int (*init) (GpsMeasurementCallbacks* callbacks);
+
+ /**
+ * Stops updates from the HAL, and unregisters the callback routines.
+ * After a call to stop, the previously registered callbacks must be considered invalid by the
+ * HAL.
+ * If stop is invoked without a previous 'init', this function should perform no work.
+ */
+ void (*close) ();
+
+} GpsMeasurementInterface;
+
+
+/** Represents a GPS navigation message (or a fragment of it). */
+typedef struct {
+ /** set to sizeof(GpsNavigationMessage) */
+ size_t size;
+
+ /**
+ * Pseudo-random number in the range of [1, 32]
+ * This is a Mandatory value.
+ */
+ int8_t prn;
+
+ /**
+ * The type of message contained in the structure.
+ * This is a Mandatory value.
+ */
+ GpsNavigationMessageType type;
+
+ /**
+ * Message identifier.
+ * It provides an index so the complete Navigation Message can be assembled.
+ * i.e. for L1 C/A the message id corresponds to the frame id of the navigation message.
+ */
+ int16_t message_id;
+
+ /**
+ * Sub-message identifier.
+ * If required by the message 'type', this value contains a sub-index within the current
+ * message (or frame) that is being transmitted.
+ * i.e. for L1 C/A the submessage id corresponds to the sub-frame id of the navigation message.
+ */
+ int16_t submessage_id;
+
+ /**
+ * The length of the data (in bytes) contained in the current message.
+ * If this value is different from zero, 'data' must point to an array of the same size.
+ * i.e. for L1 C/A the size of the sub-frame will be 40 bytes (10 words).
+ *
+ * This is a Mandatory value.
+ */
+ size_t data_length;
+
+ /**
+ * The data of the reported GPS message.
+ * The bytes (or words) specified using big endian format (MSB first).
+ */
+ uint8_t* data;
+
+} GpsNavigationMessage;
+
+/**
+ * The callback to report an available fragment of a GPS navigation messages from the HAL.
+ *
+ * Parameters:
+ * message - The GPS navigation submessage/subframe representation.
+ */
+typedef void (*gps_navigation_message_callback) (GpsNavigationMessage* message);
+
+typedef struct {
+ /** set to sizeof(GpsNavigationMessageCallbacks) */
+ size_t size;
+ gps_navigation_message_callback navigation_message_callback;
+} GpsNavigationMessageCallbacks;
+
+#define GPS_NAVIGATION_MESSAGE_OPERATION_SUCCESS 0
+#define GPS_NAVIGATION_MESSAGE_ERROR_ALREADY_INIT -100
+#define GPS_NAVIGATION_MESSAGE_ERROR_GENERIC -101
+
+/**
+ * Extended interface for GPS navigation message reporting support.
+ */
+typedef struct {
+ /** Set to sizeof(GpsNavigationMessageInterface) */
+ size_t size;
+
+ /**
+ * Initializes the interface and registers the callback routines with the HAL.
+ * After a successful call to 'init' the HAL must begin to provide updates as they become
+ * available.
+ *
+ * Status:
+ * GPS_NAVIGATION_MESSAGE_OPERATION_SUCCESS
+ * GPS_NAVIGATION_MESSAGE_ERROR_ALREADY_INIT - if a callback has already been registered
+ * without a corresponding call to 'close'.
+ * GPS_NAVIGATION_MESSAGE_ERROR_GENERIC - if any other error occurred, it is expected that
+ * the HAL will not generate any updates upon returning this error code.
+ */
+ int (*init) (GpsNavigationMessageCallbacks* callbacks);
+
+ /**
+ * Stops updates from the HAL, and unregisters the callback routines.
+ * After a call to stop, the previously registered callbacks must be considered invalid by the
+ * HAL.
+ * If stop is invoked without a previous 'init', this function should perform no work.
+ */
+ void (*close) ();
+
+} GpsNavigationMessageInterface;
+
__END_DECLS
#endif /* ANDROID_INCLUDE_HARDWARE_GPS_H */