Throttle sensor sampling rates at 200Hz.
Only sensors of the following types are throttled: accelerometer, gyroscope and magnetometer.
Both direct and non-direct connections are throttled, as follows:
- If the microphone toggle is on: all apps are throttled at 200Hz, regardless of their targetSDK.
- If the microphone toggle is off:
+ If apps target SDK <= R, no throttling.
+ If apps target SDK >= S and has the HIGH_SAMPLING_RATE_SENSORS permission, no throttling.
+ If apps target SDK >= S and does not have the HIGH_SAMPLING_RATE_SENSORS permission:
+ Sampling rates are throttled at 200 Hz.
+ If run in debug mode, a SecurityException is thrown.
Test: atest CtsSensorTestCases CtsSensorRatePermissionTestCases
Bug: 136069189
Change-Id: Idd3ba874eee34859b3f090af59def0a939688c07
diff --git a/services/sensorservice/SensorService.h b/services/sensorservice/SensorService.h
index 50c7c2f..a884a42 100644
--- a/services/sensorservice/SensorService.h
+++ b/services/sensorservice/SensorService.h
@@ -61,6 +61,15 @@
#define SENSOR_REGISTRATIONS_BUF_SIZE 200
+// Apps that targets S+ and do not have HIGH_SAMPLING_RATE_SENSORS permission will be capped
+// at 200 Hz. The cap also applies to all requests when the mic toggle is flipped, regardless of
+// their target SDKs and permission.
+// Capped sampling periods for apps that have non-direct sensor connections.
+#define SENSOR_SERVICE_CAPPED_SAMPLING_PERIOD_NS (5 * 1000 * 1000)
+// Capped sampling rate level for apps that have direct sensor connections.
+// The enum SENSOR_DIRECT_RATE_NORMAL corresponds to a rate value of at most 110 Hz.
+#define SENSOR_SERVICE_CAPPED_SAMPLING_RATE_LEVEL SENSOR_DIRECT_RATE_NORMAL
+
namespace android {
// ---------------------------------------------------------------------------
class SensorInterface;
@@ -95,6 +104,8 @@
status_t flushSensor(const sp<SensorEventConnection>& connection,
const String16& opPackageName);
+ // Returns true if a sensor should be throttled according to our rate-throttling rules.
+ static bool isSensorInCappedSet(int sensorType);
virtual status_t shellCommand(int in, int out, int err, Vector<String16>& args);
@@ -346,6 +357,13 @@
// whitelisted). mLock must be held to invoke this method.
bool isOperationRestrictedLocked(const String16& opPackageName);
+ status_t adjustSamplingPeriodBasedOnMicAndPermission(nsecs_t* requestedPeriodNs,
+ const String16& opPackageName);
+ status_t adjustRateLevelBasedOnMicAndPermission(int* requestedRateLevel,
+ const String16& opPackageName);
+ bool isRateCappedBasedOnPermission(const String16& opPackageName);
+ bool isPackageDebuggable(const String16& opPackageName);
+
// Reset the state of SensorService to NORMAL mode.
status_t resetToNormalMode();
status_t resetToNormalModeLocked();