include/hardware/gps.h

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * 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.
 */

#ifndef ANDROID_INCLUDE_HARDWARE_GPS_H
#define ANDROID_INCLUDE_HARDWARE_GPS_H

#include <stdint.h>
#include <sys/cdefs.h>
#include <sys/types.h>
#include <pthread.h>

#include <hardware/hardware.h>

__BEGIN_DECLS

/**
 * The id of this module
 */
#define GPS_HARDWARE_MODULE_ID "gps"


/** Milliseconds since January 1, 1970 */
typedef int64_t GpsUtcTime;

/** Maximum number of SVs for gps_sv_status_callback(). */
#define GPS_MAX_SVS 32

/** Requested operational mode for GPS operation. */
typedef uint32_t GpsPositionMode;
// IMPORTANT: Note that the following values must match
// constants in GpsLocationProvider.java.
/** Mode for running GPS standalone (no assistance). */
#define GPS_POSITION_MODE_STANDALONE    0
/** AGPS MS-Based mode. */
#define GPS_POSITION_MODE_MS_BASED      1
/** AGPS MS-Assisted mode. */
#define GPS_POSITION_MODE_MS_ASSISTED   2

/** Requested recurrence mode for GPS operation. */
typedef uint32_t GpsPositionRecurrence;
// IMPORTANT: Note that the following values must match
// constants in GpsLocationProvider.java.
/** Receive GPS fixes on a recurring basis at a specified period. */
#define GPS_POSITION_RECURRENCE_PERIODIC    0
/** Request a single shot GPS fix. */
#define GPS_POSITION_RECURRENCE_SINGLE      1

/** GPS status event values. */
typedef uint16_t GpsStatusValue;
// IMPORTANT: Note that the following values must match
// constants in GpsLocationProvider.java.
/** GPS status unknown. */
#define GPS_STATUS_NONE             0
/** GPS has begun navigating. */
#define GPS_STATUS_SESSION_BEGIN    1
/** GPS has stopped navigating. */
#define GPS_STATUS_SESSION_END      2
/** GPS has powered on but is not navigating. */
#define GPS_STATUS_ENGINE_ON        3
/** GPS is powered off. */
#define GPS_STATUS_ENGINE_OFF       4

/** Flags to indicate which values are valid in a GpsLocation. */
typedef uint16_t GpsLocationFlags;
// IMPORTANT: Note that the following values must match
// constants in GpsLocationProvider.java.
/** GpsLocation has valid latitude and longitude. */
#define GPS_LOCATION_HAS_LAT_LONG   0x0001
/** GpsLocation has valid altitude. */
#define GPS_LOCATION_HAS_ALTITUDE   0x0002
/** GpsLocation has valid speed. */
#define GPS_LOCATION_HAS_SPEED      0x0004
/** GpsLocation has valid bearing. */
#define GPS_LOCATION_HAS_BEARING    0x0008
/** GpsLocation has valid accuracy. */
#define GPS_LOCATION_HAS_ACCURACY   0x0010

/** Flags for the gps_set_capabilities callback. */

/** GPS HAL schedules fixes for GPS_POSITION_RECURRENCE_PERIODIC mode.
    If this is not set, then the framework will use 1000ms for min_interval
    and will start and call start() and stop() to schedule the GPS.
 */
#define GPS_CAPABILITY_SCHEDULING       0x0000001
/** GPS supports MS-Based AGPS mode */
#define GPS_CAPABILITY_MSB              0x0000002
/** GPS supports MS-Assisted AGPS mode */
#define GPS_CAPABILITY_MSA              0x0000004
/** GPS supports single-shot fixes */
#define GPS_CAPABILITY_SINGLE_SHOT      0x0000008

/** Flags used to specify which aiding data to delete
    when calling delete_aiding_data(). */
typedef uint16_t GpsAidingData;
// IMPORTANT: Note that the following values must match
// constants in GpsLocationProvider.java.
#define GPS_DELETE_EPHEMERIS        0x0001
#define GPS_DELETE_ALMANAC          0x0002
#define GPS_DELETE_POSITION         0x0004
#define GPS_DELETE_TIME             0x0008
#define GPS_DELETE_IONO             0x0010
#define GPS_DELETE_UTC              0x0020
#define GPS_DELETE_HEALTH           0x0040
#define GPS_DELETE_SVDIR            0x0080
#define GPS_DELETE_SVSTEER          0x0100
#define GPS_DELETE_SADATA           0x0200
#define GPS_DELETE_RTI              0x0400
#define GPS_DELETE_CELLDB_INFO      0x8000
#define GPS_DELETE_ALL              0xFFFF

/** AGPS type */
typedef uint16_t AGpsType;
#define AGPS_TYPE_SUPL          1
#define AGPS_TYPE_C2K           2

/**
 * String length constants
 */
#define GPS_NI_SHORT_STRING_MAXLEN      256
#define GPS_NI_LONG_STRING_MAXLEN       2048

/**
 * GpsNiType constants
 */
typedef uint32_t GpsNiType;
#define GPS_NI_TYPE_VOICE              1
#define GPS_NI_TYPE_UMTS_SUPL          2
#define GPS_NI_TYPE_UMTS_CTRL_PLANE    3

/**
 * GpsNiNotifyFlags constants
 */
typedef uint32_t GpsNiNotifyFlags;
/** NI requires notification */
#define GPS_NI_NEED_NOTIFY          0x0001
/** NI requires verification */
#define GPS_NI_NEED_VERIFY          0x0002
/** NI requires privacy override, no notification/minimal trace */
#define GPS_NI_PRIVACY_OVERRIDE     0x0004

/**
 * GPS NI responses, used to define the response in
 * NI structures
 */
typedef int GpsUserResponseType;
#define GPS_NI_RESPONSE_ACCEPT         1
#define GPS_NI_RESPONSE_DENY           2
#define GPS_NI_RESPONSE_NORESP         3

/**
 * NI data encoding scheme
 */
typedef int GpsNiEncodingType;
#define GPS_ENC_NONE                   0
#define GPS_ENC_SUPL_GSM_DEFAULT       1
#define GPS_ENC_SUPL_UTF8              2
#define GPS_ENC_SUPL_UCS2              3
#define GPS_ENC_UNKNOWN                -1

/** AGPS status event values. */
typedef uint16_t AGpsStatusValue;
/** GPS requests data connection for AGPS. */
#define GPS_REQUEST_AGPS_DATA_CONN  1
/** GPS releases the AGPS data connection. */
#define GPS_RELEASE_AGPS_DATA_CONN  2
/** AGPS data connection initiated */
#define GPS_AGPS_DATA_CONNECTED     3
/** AGPS data connection completed */
#define GPS_AGPS_DATA_CONN_DONE     4
/** AGPS data connection failed */
#define GPS_AGPS_DATA_CONN_FAILED   5

/**
 * Name for the GPS XTRA interface.
 */
#define GPS_XTRA_INTERFACE      "gps-xtra"

/**
 * Name for the GPS DEBUG interface.
 */
#define GPS_DEBUG_INTERFACE      "gps-debug"

/**
 * Name for the AGPS interface.
 */
#define AGPS_INTERFACE      "agps"

/**
 * Name for NI interface
 */
#define GPS_NI_INTERFACE "gps-ni"

/** Represents a location. */
typedef struct {
    /** set to sizeof(GpsLocation) */
    size_t          size;
    /** Contains GpsLocationFlags bits. */
    uint16_t        flags;
    /** Represents latitude in degrees. */
    double          latitude;
    /** Represents longitude in degrees. */
    double          longitude;
    /** Represents altitude in meters above the WGS 84 reference
     * ellipsoid. */
    double          altitude;
    /** Represents speed in meters per second. */
    float           speed;
    /** Represents heading in degrees. */
    float           bearing;
    /** Represents expected accuracy in meters. */
    float           accuracy;
    /** Timestamp for the location fix. */
    GpsUtcTime      timestamp;
} GpsLocation;

/** Represents the status. */
typedef struct {
    /** set to sizeof(GpsStatus) */
    size_t          size;
    GpsStatusValue status;
} GpsStatus;

/** Represents SV information. */
typedef struct {
    /** set to sizeof(GpsSvInfo) */
    size_t          size;
    /** Pseudo-random number for the SV. */
    int     prn;
    /** Signal to noise ratio. */
    float   snr;
    /** Elevation of SV in degrees. */
    float   elevation;
    /** Azimuth of SV in degrees. */
    float   azimuth;
} GpsSvInfo;

/** Represents SV status. */
typedef struct {
    /** set to sizeof(GpsSvStatus) */
    size_t          size;

    /** Number of SVs currently visible. */
    int         num_svs;

    /** Contains an array of SV information. */
    GpsSvInfo   sv_list[GPS_MAX_SVS];

    /** Represents a bit mask indicating which SVs
     * have ephemeris data.
     */
    uint32_t    ephemeris_mask;

    /** Represents a bit mask indicating which SVs
     * have almanac data.
     */
    uint32_t    almanac_mask;

    /**
     * Represents a bit mask indicating which SVs
     * were used for computing the most recent position fix.
     */
    uint32_t    used_in_fix_mask;
} GpsSvStatus;

/** Callback with location information.
 *  Can only be called from a thread created by create_thread_cb.
 */
typedef void (* gps_location_callback)(GpsLocation* location);

/** Callback with status information.
 *  Can only be called from a thread created by create_thread_cb.
 */
typedef void (* gps_status_callback)(GpsStatus* status);

/** 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);

/** Callback for reporting NMEA sentences.
 *  Can only be called from a thread created by create_thread_cb.
 */
typedef void (* gps_nmea_callback)(GpsUtcTime timestamp, const char* nmea, int length);

/** Callback to inform framework of the GPS engine's capabilities.
 *  Capability parameter is a bit field of GPS_CAPABILITY_* flags.
 */
typedef void (* gps_set_capabilities)(uint32_t capabilities);

/** Callback utility for acquiring the GPS wakelock.
 *  This can be used to prevent the CPU from suspending while handling GPS events.
 */
typedef void (* gps_acquire_wakelock)();

/** Callback utility for releasing the GPS wakelock. */
typedef void (* gps_release_wakelock)();

/** Callback for creating a thread that can call into the Java framework code.
 *  This must be used to create any threads that report events up to the framework.
 */
typedef pthread_t (* gps_create_thread)(const char* name, void (*start)(void *), void* arg);

/** GPS callback structure. */
typedef struct {
    /** set to sizeof(GpsCallbacks) */
    size_t      size;
    gps_location_callback location_cb;
    gps_status_callback status_cb;
    gps_sv_status_callback sv_status_cb;
    gps_nmea_callback nmea_cb;
    gps_set_capabilities set_capabilities_cb;
    gps_acquire_wakelock acquire_wakelock_cb;
    gps_release_wakelock release_wakelock_cb;
    gps_create_thread create_thread_cb;
} GpsCallbacks;


/** Represents the standard GPS interface. */
typedef struct {
    /** set to sizeof(GpsInterface) */
    size_t          size;
    /**
     * Opens the interface and provides the callback routines
     * to the implemenation of this interface.
     */
    int   (*init)( GpsCallbacks* callbacks );

    /** Starts navigating. */
    int   (*start)( void );

    /** Stops navigating. */
    int   (*stop)( void );

    /** Closes the interface. */
    void  (*cleanup)( void );

    /** Injects the current time. */
    int   (*inject_time)(GpsUtcTime time, int64_t timeReference,
                         int uncertainty);

    /** Injects current location from another location provider
     *  (typically cell ID).
     *  latitude and longitude are measured in degrees
     *  expected accuracy is measured in meters
     */
    int  (*inject_location)(double latitude, double longitude, float accuracy);

    /**
     * Specifies that the next call to start will not use the
     * information defined in the flags. GPS_DELETE_ALL is passed for
     * a cold start.
     */
    void  (*delete_aiding_data)(GpsAidingData flags);

    /**
     * min_interval represents the time between fixes in milliseconds.
     * preferred_accuracy represents the requested fix accuracy in meters.
     * preferred_time represents the requested time to first fix in milliseconds.
     */
    int   (*set_position_mode)(GpsPositionMode mode, GpsPositionRecurrence recurrence,
            uint32_t min_interval, uint32_t preferred_accuracy, uint32_t preferred_time);

    /** Get a pointer to extension information. */
    const void* (*get_extension)(const char* name);
} GpsInterface;

/** Callback to request the client to download XTRA data.
 *  The client should download XTRA data and inject it by calling inject_xtra_data().
 *  Can only be called from a thread created by create_thread_cb.
 */
typedef void (* gps_xtra_download_request)();

/** Callback structure for the XTRA interface. */
typedef struct {
    gps_xtra_download_request download_request_cb;
    gps_create_thread create_thread_cb;
} GpsXtraCallbacks;

/** Extended interface for XTRA support. */
typedef struct {
    /** set to sizeof(GpsXtraInterface) */
    size_t          size;
    /**
     * Opens the XTRA interface and provides the callback routines
     * to the implemenation of this interface.
     */
    int  (*init)( GpsXtraCallbacks* callbacks );
    /** Injects XTRA data into the GPS. */
    int  (*inject_xtra_data)( char* data, int length );
} GpsXtraInterface;

/** Extended interface for DEBUG support. */
typedef struct {
    /** set to sizeof(GpsDebugInterface) */
    size_t          size;

    /**
     * This function should return any information that the native
     * implementation wishes to include in a bugreport.
     */
    size_t (*get_internal_state)(char* buffer, size_t bufferSize);
} GpsDebugInterface;

/** Represents the status of AGPS. */
typedef struct {
    /** set to sizeof(AGpsStatus) */
    size_t          size;

    AGpsType        type;
    AGpsStatusValue status;
} AGpsStatus;

/** Callback with AGPS status information.
 *  Can only be called from a thread created by create_thread_cb.
 */
typedef void (* agps_status_callback)(AGpsStatus* status);

/** Callback structure for the AGPS interface. */
typedef struct {
    agps_status_callback status_cb;
    gps_create_thread create_thread_cb;
} AGpsCallbacks;


/** Extended interface for AGPS support. */
typedef struct {
    /** set to sizeof(AGpsInterface) */
    size_t          size;

    /**
     * Opens the AGPS interface and provides the callback routines
     * to the implemenation of this interface.
     */
    void  (*init)( AGpsCallbacks* callbacks );
    /**
     * Notifies that a data connection is available and sets 
     * the name of the APN to be used for SUPL.
     */
    int  (*data_conn_open)( const char* apn );
    /**
     * Notifies that the AGPS data connection has been closed.
     */
    int  (*data_conn_closed)();
    /**
     * Notifies that a data connection is not available for AGPS. 
     */
    int  (*data_conn_failed)();
    /**
     * Sets the hostname and port for the AGPS server.
     */
    int  (*set_server)( AGpsType type, const char* hostname, int port );
} AGpsInterface;


/** Represents an NI request */
typedef struct {
    /** set to sizeof(GpsNiNotification) */
    size_t          size;

    /**
     * An ID generated by HAL to associate NI notifications and UI
     * responses
     */
    int             notification_id;

    /**
     * An NI type used to distinguish different categories of NI
     * events, such as GPS_NI_TYPE_VOICE, GPS_NI_TYPE_UMTS_SUPL, ...
     */
    GpsNiType       ni_type;

    /**
     * Notification/verification options, combinations of GpsNiNotifyFlags constants
     */
    GpsNiNotifyFlags notify_flags;

    /**
     * Timeout period to wait for user response.
     * Set to 0 for no time out limit.
     */
    int             timeout;

    /**
     * Default response when time out.
     */
    GpsUserResponseType default_response;

    /**
     * Requestor ID
     */
    char            requestor_id[GPS_NI_SHORT_STRING_MAXLEN];

    /**
     * Notification message. It can also be used to store client_id in some cases
     */
    char            text[GPS_NI_LONG_STRING_MAXLEN];

    /**
     * Client name decoding scheme
     */
    GpsNiEncodingType requestor_id_encoding;

    /**
     * Client name decoding scheme
     */
    GpsNiEncodingType text_encoding;

    /**
     * A pointer to extra data. Format:
     * key_1 = value_1
     * key_2 = value_2
     */
    char           extras[GPS_NI_LONG_STRING_MAXLEN];

} GpsNiNotification;

/** Callback with NI notification.
 *  Can only be called from a thread created by create_thread_cb.
 */
typedef void (*gps_ni_notify_callback)(GpsNiNotification *notification);

/** GPS NI callback structure. */
typedef struct
{
    /**
     * Sends the notification request from HAL to GPSLocationProvider.
     */
    gps_ni_notify_callback notify_cb;
    gps_create_thread create_thread_cb;
} GpsNiCallbacks;

/**
 * Extended interface for Network-initiated (NI) support.
 */
typedef struct
{
    /** set to sizeof(GpsNiInterface) */
    size_t          size;

   /** Registers the callbacks for HAL to use. */
   void (*init) (GpsNiCallbacks *callbacks);

   /** Sends a response to HAL. */
   void (*respond) (int notif_id, GpsUserResponseType user_response);
} GpsNiInterface;

struct gps_device_t {
    struct hw_device_t common;

    /**
     * Set the provided lights to the provided values.
     *
     * Returns: 0 on succes, error code on failure.
     */
    const GpsInterface* (*get_gps_interface)(struct gps_device_t* dev);
};

__END_DECLS

#endif /* ANDROID_INCLUDE_HARDWARE_GPS_H */