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platform_hardware_libhardware/include/hardware/gps.h
Jaikumar Ganesh 052a20a854 Add GPS geofencing HAL. 
This adds APIs for doing GPS Geofencing in the hardware.

Change-Id: I32564d7620969e6a1cd3c32242b7805d26b7af1e
2013-02-21 17:12:34 -08:00

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/*
* 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
/** GPS supports on demand time injection */
#define GPS_CAPABILITY_ON_DEMAND_TIME 0x0000010
/** GPS supports Geofencing */
#define GPS_CAPABILITY_GEOFENCING 0x0000020
/** 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
typedef uint16_t AGpsSetIDType;
#define AGPS_SETID_TYPE_NONE 0
#define AGPS_SETID_TYPE_IMSI 1
#define AGPS_SETID_TYPE_MSISDN 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
#define AGPS_REF_LOCATION_TYPE_GSM_CELLID 1
#define AGPS_REF_LOCATION_TYPE_UMTS_CELLID 2
#define AGPS_REG_LOCATION_TYPE_MAC 3
/** Network types for update_network_state "type" parameter */
#define AGPS_RIL_NETWORK_TYPE_MOBILE 0
#define AGPS_RIL_NETWORK_TYPE_WIFI 1
#define AGPS_RIL_NETWORK_TYPE_MOBILE_MMS 2
#define AGPS_RIL_NETWORK_TYPE_MOBILE_SUPL 3
#define AGPS_RIL_NETWORK_TTYPE_MOBILE_DUN 4
#define AGPS_RIL_NETWORK_TTYPE_MOBILE_HIPRI 5
#define AGPS_RIL_NETWORK_TTYPE_WIMAX 6
/**
* 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"
/**
* Name for the AGPS-RIL interface.
*/
#define AGPS_RIL_INTERFACE "agps_ril"
/**
* Name for the GPS_Geofencing interface.
*/
#define GPS_GEOFENCING_INTERFACE "gps_geofencing"
/** 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;
/* 2G and 3G */
/* In 3G lac is discarded */
typedef struct {
uint16_t type;
uint16_t mcc;
uint16_t mnc;
uint16_t lac;
uint32_t cid;
} AGpsRefLocationCellID;
typedef struct {
uint8_t mac[6];
} AGpsRefLocationMac;
/** Represents ref locations */
typedef struct {
uint16_t type;
union {
AGpsRefLocationCellID cellID;
AGpsRefLocationMac mac;
} u;
} AGpsRefLocation;
/** 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 requesting NTP time */
typedef void (* gps_request_utc_time)();
/** 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;
gps_request_utc_time request_utc_time_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;
uint32_t ipaddr;
} 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);
};
#define AGPS_RIL_REQUEST_SETID_IMSI (1<<0L)
#define AGPS_RIL_REQUEST_SETID_MSISDN (1<<1L)
#define AGPS_RIL_REQUEST_REFLOC_CELLID (1<<0L)
#define AGPS_RIL_REQUEST_REFLOC_MAC (1<<1L)
typedef void (*agps_ril_request_set_id)(uint32_t flags);
typedef void (*agps_ril_request_ref_loc)(uint32_t flags);
typedef struct {
agps_ril_request_set_id request_setid;
agps_ril_request_ref_loc request_refloc;
gps_create_thread create_thread_cb;
} AGpsRilCallbacks;
/** Extended interface for AGPS_RIL support. */
typedef struct {
/** set to sizeof(AGpsRilInterface) */
size_t size;
/**
* Opens the AGPS interface and provides the callback routines
* to the implemenation of this interface.
*/
void (*init)( AGpsRilCallbacks* callbacks );
/**
* Sets the reference location.
*/
void (*set_ref_location) (const AGpsRefLocation *agps_reflocation, size_t sz_struct);
/**
* Sets the set ID.
*/
void (*set_set_id) (AGpsSetIDType type, const char* setid);
/**
* Send network initiated message.
*/
void (*ni_message) (uint8_t *msg, size_t len);
/**
* Notify GPS of network status changes.
* These parameters match values in the android.net.NetworkInfo class.
*/
void (*update_network_state) (int connected, int type, int roaming, const char* extra_info);
/**
* Notify GPS of network status changes.
* These parameters match values in the android.net.NetworkInfo class.
*/
void (*update_network_availability) (int avaiable, const char* apn);
} AGpsRilInterface;
/**
* GPS Geofence.
* There are 3 states associated with a Geofence: Inside, Outside, Unknown.
* There are 3 transitions: ENTERED, EXITED, UNCERTAIN.
*
* An example state diagram with confidence level: 95% and Unknown time limit
* set as 30 secs is shown below. (confidence level and Unknown time limit are
* explained latter)
* ____________________________
* | Unknown (30 secs) |
* """"""""""""""""""""""""""""
* ^ | | ^
* UNCERTAIN| |ENTERED EXITED| |UNCERTAIN
* | v v |
* ________ EXITED _________
* | Inside | -----------> | Outside |
* | | <----------- | |
* """""""" ENTERED """""""""
*
* Inside state: We are 95% confident that the user is inside the geofence.
* Outside state: We are 95% confident that the user is outside the geofence
* Unknown state: Rest of the time.
*
* The Unknown state is better explained with an example:
*
* __________
* | c|
* | ___ | _______
* | |a| | | b |
* | """ | """""""
* | |
* """"""""""
* In the diagram above, "a" and "b" are 2 geofences and "c" is the accuracy
* circle reported by the GPS subsystem. Now with regard to "b", the system is
* confident that the user is outside. But with regard to "a" is not confident
* whether it is inside or outside the geofence. If the accuracy remains the
* same for a sufficient period of time, the UNCERTAIN transition would be
* triggered with the state set to Unknown. If the accuracy improves later, an
* appropriate transition should be triggered. This "sufficient period of time"
* is defined by the parameter in the add_geofence_area API.
* In other words, Unknown state can be interpreted as a state in which the
* GPS subsystem isn't confident enough that the user is either inside or
* outside the Geofence. It moves to Unknown state only after the expiry of the
* timeout.
*
* The geofence callback needs to be triggered for the ENTERED and EXITED
* transitions, when the GPS system is confident that the user has entered
* (Inside state) or exited (Outside state) the Geofence. An implementation
* which uses a value of 95% as the confidence is recommended. The callback
* should be triggered only for the transitions requested by the
* add_geofence_area call.
*
* Even though the diagram and explanation talks about states and transitions,
* the callee is only interested in the transistions. The states are mentioned
* here for illustrative purposes.
*
* Startup Scenario: When the device boots up, if an application adds geofences,
* and then we get an accurate GPS location fix, it needs to trigger the
* appropriate (ENTERED or EXITED) transition for every Geofence it knows about.
* By default, all the Geofences will be in the Unknown state.
*
* When the GPS system is unavailable, gps_geofence_status_callback should be
* called to inform the upper layers of the same. Similarly, when it becomes
* available the callback should be called. This is a global state while the
* UNKNOWN transition described above is per geofence.
*
* An important aspect to note is that users of this API (framework), will use
* other subsystems like wifi, sensors, cell to handle Unknown case and
* hopefully provide a definitive state transition to the third party
* application. GPS Geofence will just be a signal indicating what the GPS
* subsystem knows about the Geofence.
*
*/
#define GPS_GEOFENCE_ENTERED (1<<0L)
#define GPS_GEOFENCE_EXITED (1<<1L)
#define GPS_GEOFENCE_UNCERTAIN (1<<2L)
#define GPS_GEOFENCE_UNAVAILABLE (1<<0L)
#define GPS_GEOFENCE_AVAILABLE (1<<1L)
/**
* The callback associated with the geofence.
* Parameters:
* geofence_id - The id associated with the add_geofence_area.
* location - The current GPS location.
* transition - Can be one of GPS_GEOFENCE_ENTERED, GPS_GEOFENCE_EXITED,
* GPS_GEOFENCE_UNCERTAIN.
* timestamp - Timestamp when the transition was detected.
*
* The callback should only be called when the caller is interested in that
* particular transition. For instance, if the caller is interested only in
* ENTERED transition, then the callback should NOT be called with the EXITED
* transition.
*
* IMPORTANT: If a transition is triggered resulting in this callback, the GPS
* subsystem will wake up the application processor, if its in suspend state.
*/
typedef void (*gps_geofence_transition_callback) (int32_t geofence_id, GpsLocation* location,
int32_t transition, GpsUtcTime timestamp);
/**
* The callback associated with the availablity 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.
*
* Parameters:
* status - GPS_GEOFENCE_UNAVAILABLE or GPS_GEOFENCE_AVAILABLE.
* last_location - Last known location.
*/
typedef void (*gps_geofence_status_callback) (int32_t status, GpsLocation* last_location);
typedef struct {
gps_geofence_transition_callback geofence_transition_callback;
gps_geofence_status_callback geofence_status_callback;
gps_create_thread create_thread_cb;
} GpsGeofenceCallbacks;
/** Extended interface for GPS_Geofencing support */
typedef struct {
/** set to sizeof(GpsGeofencingInterface) */
size_t size;
/**
* Opens the geofence interface and provides the callback routines
* to the implemenation of this interface.
*/
void (*init)( GpsGeofenceCallbacks* callbacks );
/**
* Add a geofence area. This api currently supports circular geofences.
* Parameters:
* geofence_id - The id for the geofence. If a geofence with this id
already exists, an error value (-1) should be returned.
* latitude, longtitude, radius_meters - The lat, long and radius
* (in meters) for the geofence
* last_transition - The current state of the geofence. For example, if
* the system already knows that the user is inside the geofence,
* this will be set to GPS_GEOFENCE_ENTERED. In most cases, it
* will be GPS_GEOFENCE_UNCERTAIN.
* monitor_transition - Which transitions to monitor. Bitwise OR of
* GPS_GEOFENCE_ENTERED, GPS_GEOFENCE_EXITED and
* GPS_GEOFENCE_UNCERTAIN.
* notification_responsiveness_ms - Defines the best-effort description
* of how soon should the callback be called when the transition
* associated with the Geofence is triggered. For instance, if set
* to 1000 millseconds with GPS_GEOFENCE_ENTERED, the callback
* should be called 1000 milliseconds within entering the geofence.
* This parameter is defined in milliseconds.
* NOTE: This is not to be confused with the rate that the GPS is
* polled at. It is acceptable to dynamically vary the rate of
* 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.
* See above for a detailed explanation.
* Return value: 0 on success, -1 on error.
*/
int (*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.
* Parameters:
* geofence_id - The id for the geofence.
*
* Return value: 0 on success, -1 on error.
*/
int (*pause_geofence) (int32_t geofence_id);
/**
* Resume monitoring a particular geofence.
* Parameters:
* geofence_id - The id for the geofence.
* monitor_transitions - Which transitions to monitor. Bitwise OR of
* GPS_GEOFENCE_ENTERED, GPS_GEOFENCE_EXITED and
* GPS_GEOFENCE_UNCERTAIN.
* This supersedes the value associated provided in the
* add_geofence_area call.
*
* Return value: 0 on success, -1 on error.
*
*/
int (*resume_geofence) (int32_t geofence_id, int monitor_transitions);
/**
* Remove a geofence area. After the function returns, no notifications
* should be sent.
* Parameter:
* geofence_id - The id for the geofence.
* Return value: 0 on success, -1 on error.
*/
int (*remove_geofence_area) (int32_t geofence_id);
} GpsGeofencingInterface;
__END_DECLS
#endif /* ANDROID_INCLUDE_HARDWARE_GPS_H */
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