diff --git a/include/hardware/sensors.h b/include/hardware/sensors.h
index 2abca72..ca017a0 100644
--- a/include/hardware/sensors.h
+++ b/include/hardware/sensors.h
@@ -33,6 +33,7 @@
 #define SENSORS_DEVICE_API_VERSION_0_1  HARDWARE_DEVICE_API_VERSION_2(0, 1, SENSORS_HEADER_VERSION)
 #define SENSORS_DEVICE_API_VERSION_1_0  HARDWARE_DEVICE_API_VERSION_2(1, 0, SENSORS_HEADER_VERSION)
 #define SENSORS_DEVICE_API_VERSION_1_1  HARDWARE_DEVICE_API_VERSION_2(1, 1, SENSORS_HEADER_VERSION)
+#define SENSORS_DEVICE_API_VERSION_1_2  HARDWARE_DEVICE_API_VERSION_2(1, 2, SENSORS_HEADER_VERSION)
 
 /**
  * Please see the Sensors section of source.android.com for an
@@ -81,6 +82,13 @@
 };
 
 /*
+ * The permission to use for body sensors (like heart rate monitors).
+ * See sensor types for more details on what sensors should require this
+ * permission.
+ */
+#define SENSOR_PERMISSION_BODY_SENSORS "android.permission.BODY_SENSORS"
+
+/*
  * Sensor type
  *
  * Each sensor has a type which defines what this sensor measures and how
@@ -93,6 +101,38 @@
  * their private use by applications or services provided by them. Such
  * sensor types are specific to an OEM and can't be exposed in the SDK.
  * These types must start at SENSOR_TYPE_DEVICE_PRIVATE_BASE.
+ *
+ * All sensors defined outside of the device private range must correspond to
+ * a type defined in this file, and must satisfy the characteristics listed in
+ * the description of the sensor type.
+ *
+ * Starting with version SENSORS_DEVICE_API_VERSION_1_2, each sensor also
+ * has a stringType.
+ *  - StringType of sensors inside of the device private range MUST be prefixed
+ *    by the sensor provider's or OEM reverse domain name. In particular, they
+ *    cannot use the "android.sensor" prefix.
+ *  - StringType of sensors outside of the device private range MUST correspond
+ *    to the one defined in this file (starting with "android.sensor").
+ *    For example, accelerometers must have
+ *      type=SENSOR_TYPE_ACCELEROMETER and
+ *      stringType=SENSOR_STRING_TYPE_ACCELEROMETER
+ *
+ * When android introduces a new sensor type that can replace an OEM-defined
+ * sensor type, the OEM must use the official sensor type and stringType on
+ * versions of the HAL that support this new official sensor type.
+ *
+ * Example (made up): Suppose Google's Glass team wants to surface a sensor
+ * detecting that Glass is on a head.
+ *  - Such a sensor is not officially supported in android KitKat
+ *  - Glass devices launching on KitKat can implement a sensor with
+ *    type = 0x10001 and stringType = "com.google.glass.onheaddetector"
+ *  - In L android release, if android decides to define
+ *    SENSOR_TYPE_ON_HEAD_DETECTOR and STRING_SENSOR_TYPE_ON_HEAD_DETECTOR,
+ *    those types should replace the Glass-team-specific types in all future
+ *    launches.
+ *  - When launching glass on the L release, Google should now use the official
+ *    type (SENSOR_TYPE_ON_HEAD_DETECTOR) and stringType.
+ *  - This way, all applications can now use this sensor.
  */
 
 /*
@@ -132,7 +172,7 @@
  * must not be used.
  *
  */
-#define SENSOR_TYPE_META_DATA                           (0)
+#define SENSOR_TYPE_META_DATA                        (0)
 
 /*
  * SENSOR_TYPE_ACCELEROMETER
@@ -144,6 +184,7 @@
  *
  */
 #define SENSOR_TYPE_ACCELEROMETER                    (1)
+#define SENSOR_STRING_TYPE_ACCELEROMETER             "android.sensor.accelerometer"
 
 /*
  * SENSOR_TYPE_GEOMAGNETIC_FIELD
@@ -156,6 +197,7 @@
  */
 #define SENSOR_TYPE_GEOMAGNETIC_FIELD                (2)
 #define SENSOR_TYPE_MAGNETIC_FIELD  SENSOR_TYPE_GEOMAGNETIC_FIELD
+#define SENSOR_STRING_TYPE_MAGNETIC_FIELD            "android.sensor.magnetic_field"
 
 /*
  * SENSOR_TYPE_ORIENTATION
@@ -168,6 +210,7 @@
  * rate defined by setDelay().
  */
 #define SENSOR_TYPE_ORIENTATION                      (3)
+#define SENSOR_STRING_TYPE_ORIENTATION               "android.sensor.orientation"
 
 /*
  * SENSOR_TYPE_GYROSCOPE
@@ -178,6 +221,7 @@
  *  around the X, Y and Z axis.
  */
 #define SENSOR_TYPE_GYROSCOPE                        (4)
+#define SENSOR_STRING_TYPE_GYROSCOPE                 "android.sensor.gyroscope"
 
 /*
  * SENSOR_TYPE_LIGHT
@@ -187,6 +231,7 @@
  * The light sensor value is returned in SI lux units.
  */
 #define SENSOR_TYPE_LIGHT                            (5)
+#define SENSOR_STRING_TYPE_LIGHT                     "android.sensor.light"
 
 /*
  * SENSOR_TYPE_PRESSURE
@@ -196,9 +241,11 @@
  * The pressure sensor return the athmospheric pressure in hectopascal (hPa)
  */
 #define SENSOR_TYPE_PRESSURE                         (6)
+#define SENSOR_STRING_TYPE_PRESSURE                  "android.sensor.pressure"
 
 /* SENSOR_TYPE_TEMPERATURE is deprecated in the HAL */
 #define SENSOR_TYPE_TEMPERATURE                      (7)
+#define SENSOR_STRING_TYPE_TEMPERATURE               "android.sensor.temperature"
 
 /*
  * SENSOR_TYPE_PROXIMITY
@@ -208,6 +255,7 @@
  * The value corresponds to the distance to the nearest object in centimeters.
  */
 #define SENSOR_TYPE_PROXIMITY                        (8)
+#define SENSOR_STRING_TYPE_PROXIMITY                 "android.sensor.proximity"
 
 /*
  * SENSOR_TYPE_GRAVITY
@@ -218,6 +266,7 @@
  * the devices's coordinates.
  */
 #define SENSOR_TYPE_GRAVITY                          (9)
+#define SENSOR_STRING_TYPE_GRAVITY                   "android.sensor.gravity"
 
 /*
  * SENSOR_TYPE_LINEAR_ACCELERATION
@@ -228,6 +277,7 @@
  * not including gravity.
  */
 #define SENSOR_TYPE_LINEAR_ACCELERATION             (10)
+#define SENSOR_STRING_TYPE_LINEAR_ACCELERATION      "android.sensor.linear_acceleration"
 
 
 /*
@@ -239,6 +289,7 @@
  * East-North-Up coordinates frame.
  */
 #define SENSOR_TYPE_ROTATION_VECTOR                 (11)
+#define SENSOR_STRING_TYPE_ROTATION_VECTOR          "android.sensor.rotation_vector"
 
 /*
  * SENSOR_TYPE_RELATIVE_HUMIDITY
@@ -249,6 +300,7 @@
  * returns a value in percent.
  */
 #define SENSOR_TYPE_RELATIVE_HUMIDITY               (12)
+#define SENSOR_STRING_TYPE_RELATIVE_HUMIDITY        "android.sensor.relative_humidity"
 
 /*
  * SENSOR_TYPE_AMBIENT_TEMPERATURE
@@ -258,6 +310,7 @@
  * The ambient (room) temperature in degree Celsius.
  */
 #define SENSOR_TYPE_AMBIENT_TEMPERATURE             (13)
+#define SENSOR_STRING_TYPE_AMBIENT_TEMPERATURE      "android.sensor.ambient_temperature"
 
 /*
  * SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED
@@ -268,6 +321,7 @@
  *  reported separately instead of being included in the measurement.
  */
 #define SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED     (14)
+#define SENSOR_STRING_TYPE_MAGNETIC_FIELD_UNCALIBRATED "android.sensor.magnetic_field_uncalibrated"
 
 /*
  * SENSOR_TYPE_GAME_ROTATION_VECTOR
@@ -278,6 +332,7 @@
  *  field.
  */
 #define SENSOR_TYPE_GAME_ROTATION_VECTOR            (15)
+#define SENSOR_STRING_TYPE_GAME_ROTATION_VECTOR     "android.sensor.game_rotation_vector"
 
 /*
  * SENSOR_TYPE_GYROSCOPE_UNCALIBRATED
@@ -288,6 +343,7 @@
  *  around the X, Y and Z axis.
  */
 #define SENSOR_TYPE_GYROSCOPE_UNCALIBRATED          (16)
+#define SENSOR_STRING_TYPE_GYROSCOPE_UNCALIBRATED   "android.sensor.gyroscope_uncalibrated"
 
 /*
  * SENSOR_TYPE_SIGNIFICANT_MOTION
@@ -300,7 +356,7 @@
  */
 
 #define SENSOR_TYPE_SIGNIFICANT_MOTION              (17)
-
+#define SENSOR_STRING_TYPE_SIGNIFICANT_MOTION       "android.sensor.significant_motion"
 
 /*
  * SENSOR_TYPE_STEP_DETECTOR
@@ -313,6 +369,7 @@
  */
 
 #define SENSOR_TYPE_STEP_DETECTOR                   (18)
+#define SENSOR_STRING_TYPE_STEP_DETECTOR            "android.sensor.step_detector"
 
 
 /*
@@ -326,6 +383,7 @@
  */
 
 #define SENSOR_TYPE_STEP_COUNTER                    (19)
+#define SENSOR_STRING_TYPE_STEP_COUNTER             "android.sensor.step_counter"
 
 /*
  * SENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR
@@ -335,7 +393,22 @@
  *  Similar to SENSOR_TYPE_ROTATION_VECTOR, but using a magnetometer instead
  *  of using a gyroscope.
  */
-#define SENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR            (20)
+#define SENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR     (20)
+#define SENSOR_STRING_TYPE_GEOMAGNETIC_ROTATION_VECTOR "android.sensor.geomagnetic_rotation_vector"
+
+/*
+ * SENSOR_TYPE_HEART_RATE
+ * trigger-mode: on-change
+ * wake-up sensor: no
+ *
+ *  A sensor of this type returns the current heart rate if activated.
+ *  The value is returned as a float which represents the heart rate in beats
+ *  per minute (BPM).
+ *  When the sensor cannot measure the heart rate, the returned value must be 0.
+ *  sensor_t.requiredPermission must be set to SENSOR_PERMISSION_BODY_SENSORS.
+ */
+#define SENSOR_TYPE_HEART_RATE                      (21)
+#define SENSOR_STRING_TYPE_HEART_RATE               "android.sensor.heart_rate"
 
 /**
  * Values returned by the accelerometer in various locations in the universe.
@@ -466,6 +539,9 @@
             /* uncalibrated magnetometer values are in micro-Teslas */
             uncalibrated_event_t uncalibrated_magnetic;
 
+            /* heart rate in bpm */
+            float           heart_rate;
+
             /* this is a special event. see SENSOR_TYPE_META_DATA above.
              * sensors_meta_data_event_t events are all reported with a type of
              * SENSOR_TYPE_META_DATA. The handle is ignored and must be zero.
@@ -562,8 +638,27 @@
      */
     uint32_t        fifoMaxEventCount;
 
+    /* type of this sensor as a string. Set to corresponding
+     * SENSOR_STRING_TYPE_*.
+     * When defining an OEM specific sensor or sensor manufacturer specific
+     * sensor, use your reserve domain name as a prefix.
+     * ex: com.google.glass.onheaddetector
+     * For sensors of known type, the android framework might overwrite this
+     * string automatically.
+     */
+    const char*    stringType;
+
+    /* permission required to see this sensor, register to it and receive data.
+     * Set to "" if no permission is required. Some sensor types like the
+     * heart rate monitor have a mandatory require_permission.
+     * For sensors that always require a specific permission, like the heart
+     * rate monitor, the android framework might overwrite this string
+     * automatically.
+     */
+    const char*    requiredPermission;
+
     /* reserved fields, must be zero */
-    void*           reserved[6];
+    void*           reserved[4];
 };