2 * Copyright (C) 2012 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef ANDROID_SENSORS_INTERFACE_H
18 #define ANDROID_SENSORS_INTERFACE_H
21 #include <sys/cdefs.h>
22 #include <sys/types.h>
24 #include <hardware/hardware.h>
25 #include <cutils/native_handle.h>
29 /*****************************************************************************/
31 #define SENSORS_HEADER_VERSION 1
32 #define SENSORS_MODULE_API_VERSION_0_1 HARDWARE_MODULE_API_VERSION(0, 1)
33 #define SENSORS_DEVICE_API_VERSION_0_1 HARDWARE_DEVICE_API_VERSION_2(0, 1, SENSORS_HEADER_VERSION)
34 #define SENSORS_DEVICE_API_VERSION_1_0 HARDWARE_DEVICE_API_VERSION_2(1, 0, SENSORS_HEADER_VERSION)
35 #define SENSORS_DEVICE_API_VERSION_1_1 HARDWARE_DEVICE_API_VERSION_2(1, 1, SENSORS_HEADER_VERSION)
36 #define SENSORS_DEVICE_API_VERSION_1_2 HARDWARE_DEVICE_API_VERSION_2(1, 2, SENSORS_HEADER_VERSION)
37 #define SENSORS_DEVICE_API_VERSION_1_3 HARDWARE_DEVICE_API_VERSION_2(1, 3, SENSORS_HEADER_VERSION)
38 #define SENSORS_DEVICE_API_VERSION_1_4 HARDWARE_DEVICE_API_VERSION_2(1, 4, SENSORS_HEADER_VERSION)
41 * Please see the Sensors section of source.android.com for an
42 * introduction to and detailed descriptions of Android sensor types:
43 * http://source.android.com/devices/sensors/index.html
47 * The id of this module
49 #define SENSORS_HARDWARE_MODULE_ID "sensors"
52 * Name of the sensors device to open
54 #define SENSORS_HARDWARE_POLL "poll"
57 * Handles must be higher than SENSORS_HANDLE_BASE and must be unique.
58 * A Handle identifies a given sensors. The handle is used to activate
59 * and/or deactivate sensors.
60 * In this version of the API there can only be 256 handles.
62 #define SENSORS_HANDLE_BASE 0
63 #define SENSORS_HANDLE_BITS 8
64 #define SENSORS_HANDLE_COUNT (1<<SENSORS_HANDLE_BITS)
68 * **** Deprecated *****
69 * flags for (*batch)()
70 * Availability: SENSORS_DEVICE_API_VERSION_1_0
71 * see (*batch)() documentation for details.
72 * Deprecated as of SENSORS_DEVICE_API_VERSION_1_3.
73 * WAKE_UP_* sensors replace WAKE_UPON_FIFO_FULL concept.
76 SENSORS_BATCH_DRY_RUN = 0x00000001,
77 SENSORS_BATCH_WAKE_UPON_FIFO_FULL = 0x00000002
81 * what field for meta_data_event_t
84 /* a previous flush operation has completed */
85 META_DATA_FLUSH_COMPLETE = 1,
86 META_DATA_VERSION /* always last, leave auto-assigned */
90 * The permission to use for body sensors (like heart rate monitors).
91 * See sensor types for more details on what sensors should require this
94 #define SENSOR_PERMISSION_BODY_SENSORS "android.permission.BODY_SENSORS"
97 * Availability: SENSORS_DEVICE_API_VERSION_1_4
98 * Sensor HAL modes used in set_operation_mode method
102 * Operating modes for the HAL.
106 * Normal mode operation. This is the default state of operation.
107 * The HAL shall initialize into this mode on device startup.
109 SENSOR_HAL_NORMAL_MODE = 0,
112 * Loopback mode. In this mode, the device shall not source data from the
113 * physical sensors as it would in normal mode. Instead sensor data is
114 * injected by the sensor service.
116 SENSOR_HAL_LOOPBACK_MODE = 0x1
120 * Availability: SENSORS_DEVICE_API_VERSION_1_3
121 * Sensor flags used in sensor_t.flags.
125 * Whether this sensor wakes up the AP from suspend mode when data is available. Whenever
126 * sensor events are delivered from a wake_up sensor, the driver needs to hold a wake_lock till
127 * the events are read by the SensorService i.e till sensors_poll_device_t.poll() is called the
128 * next time. Once poll is called again it means events have been read by the SensorService, the
129 * driver can safely release the wake_lock. SensorService will continue to hold a wake_lock till
130 * the app actually reads the events.
132 SENSOR_FLAG_WAKE_UP = 1U << 0,
134 * Reporting modes for various sensors. Each sensor will have exactly one of these modes set.
135 * The least significant 2nd, 3rd and 4th bits are used to represent four possible reporting
138 SENSOR_FLAG_CONTINUOUS_MODE = 0, // 0000
139 SENSOR_FLAG_ON_CHANGE_MODE = 0x2, // 0010
140 SENSOR_FLAG_ONE_SHOT_MODE = 0x4, // 0100
141 SENSOR_FLAG_SPECIAL_REPORTING_MODE = 0x6 // 0110
145 * Mask and shift for reporting mode sensor flags defined above.
147 #define REPORTING_MODE_MASK (0xE)
148 #define REPORTING_MODE_SHIFT (1)
153 * Each sensor has a type which defines what this sensor measures and how
154 * measures are reported. See the Base sensors and Composite sensors lists
155 * for complete descriptions:
156 * http://source.android.com/devices/sensors/base_triggers.html
157 * http://source.android.com/devices/sensors/composite_sensors.html
159 * Device manufacturers (OEMs) can define their own sensor types, for
160 * their private use by applications or services provided by them. Such
161 * sensor types are specific to an OEM and can't be exposed in the SDK.
162 * These types must start at SENSOR_TYPE_DEVICE_PRIVATE_BASE.
164 * All sensors defined outside of the device private range must correspond to
165 * a type defined in this file, and must satisfy the characteristics listed in
166 * the description of the sensor type.
168 * Starting with version SENSORS_DEVICE_API_VERSION_1_2, each sensor also
170 * - StringType of sensors inside of the device private range MUST be prefixed
171 * by the sensor provider's or OEM reverse domain name. In particular, they
172 * cannot use the "android.sensor" prefix.
173 * - StringType of sensors outside of the device private range MUST correspond
174 * to the one defined in this file (starting with "android.sensor").
175 * For example, accelerometers must have
176 * type=SENSOR_TYPE_ACCELEROMETER and
177 * stringType=SENSOR_STRING_TYPE_ACCELEROMETER
179 * When android introduces a new sensor type that can replace an OEM-defined
180 * sensor type, the OEM must use the official sensor type and stringType on
181 * versions of the HAL that support this new official sensor type.
183 * Example (made up): Suppose Google's Glass team wants to surface a sensor
184 * detecting that Glass is on a head.
185 * - Such a sensor is not officially supported in android KitKat
186 * - Glass devices launching on KitKat can implement a sensor with
187 * type = 0x10001 and stringType = "com.google.glass.onheaddetector"
188 * - In L android release, if android decides to define
189 * SENSOR_TYPE_ON_HEAD_DETECTOR and STRING_SENSOR_TYPE_ON_HEAD_DETECTOR,
190 * those types should replace the Glass-team-specific types in all future
192 * - When launching Glass on the L release, Google should now use the official
193 * type (SENSOR_TYPE_ON_HEAD_DETECTOR) and stringType.
194 * - This way, all applications can now use this sensor.
198 * Base for device manufacturers private sensor types.
199 * These sensor types can't be exposed in the SDK.
201 #define SENSOR_TYPE_DEVICE_PRIVATE_BASE 0x10000
204 * SENSOR_TYPE_META_DATA
205 * reporting-mode: n/a
206 * wake-up sensor: n/a
208 * NO SENSOR OF THAT TYPE MUST BE RETURNED (*get_sensors_list)()
210 * SENSOR_TYPE_META_DATA is a special token used to populate the
211 * sensors_meta_data_event structure. It doesn't correspond to a physical
212 * sensor. sensors_meta_data_event are special, they exist only inside
213 * the HAL and are generated spontaneously, as opposed to be related to
216 * sensors_meta_data_event_t.version must be META_DATA_VERSION
217 * sensors_meta_data_event_t.sensor must be 0
218 * sensors_meta_data_event_t.type must be SENSOR_TYPE_META_DATA
219 * sensors_meta_data_event_t.reserved must be 0
220 * sensors_meta_data_event_t.timestamp must be 0
222 * The payload is a meta_data_event_t, where:
223 * meta_data_event_t.what can take the following values:
225 * META_DATA_FLUSH_COMPLETE
226 * This event indicates that a previous (*flush)() call has completed for the sensor
227 * handle specified in meta_data_event_t.sensor.
228 * see (*flush)() for more details
230 * All other values for meta_data_event_t.what are reserved and
234 #define SENSOR_TYPE_META_DATA (0)
238 * Each sensor may have either or both a wake-up and a non-wake variant.
239 * When registered in batch mode, wake-up sensors will wake up the AP when
240 * their FIFOs are full or when the batch timeout expires. A separate FIFO has
241 * to be maintained for wake up sensors and non wake up sensors. The non wake-up
242 * sensors need to overwrite their FIFOs when they are full till the AP wakes up
243 * and the wake-up sensors will wake-up the AP when their FIFOs are full or when
244 * the batch timeout expires without losing events. Wake-up and non wake-up variants
245 * of each sensor can be activated at different rates independently of each other.
247 * Note: Proximity sensor and significant motion sensor which were defined in previous
248 * releases are also wake-up sensors and should be treated as such. Wake-up one-shot
249 * sensors like SIGNIFICANT_MOTION cannot be batched, hence the text about batch above
250 * doesn't apply to them. See the definitions of SENSOR_TYPE_PROXIMITY and
251 * SENSOR_TYPE_SIGNIFICANT_MOTION for more info.
253 * Set SENSOR_FLAG_WAKE_UP flag for all wake-up sensors.
255 * For example, A device can have two sensors both of SENSOR_TYPE_ACCELEROMETER and
256 * one of them can be a wake_up sensor (with SENSOR_FLAG_WAKE_UP flag set) and the other
257 * can be a regular non wake_up sensor. Both of these sensors must be activated/deactivated
258 * independently of the other.
262 * SENSOR_TYPE_ACCELEROMETER
263 * reporting-mode: continuous
265 * All values are in SI units (m/s^2) and measure the acceleration of the
266 * device minus the force of gravity.
268 * Implement the non-wake-up version of this sensor and implement the wake-up
269 * version if the system possesses a wake up fifo.
271 #define SENSOR_TYPE_ACCELEROMETER (1)
272 #define SENSOR_STRING_TYPE_ACCELEROMETER "android.sensor.accelerometer"
275 * SENSOR_TYPE_GEOMAGNETIC_FIELD
276 * reporting-mode: continuous
278 * All values are in micro-Tesla (uT) and measure the geomagnetic
279 * field in the X, Y and Z axis.
281 * Implement the non-wake-up version of this sensor and implement the wake-up
282 * version if the system possesses a wake up fifo.
284 #define SENSOR_TYPE_GEOMAGNETIC_FIELD (2)
285 #define SENSOR_TYPE_MAGNETIC_FIELD SENSOR_TYPE_GEOMAGNETIC_FIELD
286 #define SENSOR_STRING_TYPE_MAGNETIC_FIELD "android.sensor.magnetic_field"
289 * SENSOR_TYPE_ORIENTATION
290 * reporting-mode: continuous
292 * All values are angles in degrees.
294 * Orientation sensors return sensor events for all 3 axes at a constant
295 * rate defined by setDelay().
297 * Implement the non-wake-up version of this sensor and implement the wake-up
298 * version if the system possesses a wake up fifo.
300 #define SENSOR_TYPE_ORIENTATION (3)
301 #define SENSOR_STRING_TYPE_ORIENTATION "android.sensor.orientation"
304 * SENSOR_TYPE_GYROSCOPE
305 * reporting-mode: continuous
307 * All values are in radians/second and measure the rate of rotation
308 * around the X, Y and Z axis.
310 * Implement the non-wake-up version of this sensor and implement the wake-up
311 * version if the system possesses a wake up fifo.
313 #define SENSOR_TYPE_GYROSCOPE (4)
314 #define SENSOR_STRING_TYPE_GYROSCOPE "android.sensor.gyroscope"
318 * reporting-mode: on-change
320 * The light sensor value is returned in SI lux units.
322 * Both wake-up and non wake-up versions are useful.
324 #define SENSOR_TYPE_LIGHT (5)
325 #define SENSOR_STRING_TYPE_LIGHT "android.sensor.light"
328 * SENSOR_TYPE_PRESSURE
329 * reporting-mode: continuous
331 * The pressure sensor return the athmospheric pressure in hectopascal (hPa)
333 * Implement the non-wake-up version of this sensor and implement the wake-up
334 * version if the system possesses a wake up fifo.
336 #define SENSOR_TYPE_PRESSURE (6)
337 #define SENSOR_STRING_TYPE_PRESSURE "android.sensor.pressure"
339 /* SENSOR_TYPE_TEMPERATURE is deprecated in the HAL */
340 #define SENSOR_TYPE_TEMPERATURE (7)
341 #define SENSOR_STRING_TYPE_TEMPERATURE "android.sensor.temperature"
344 * SENSOR_TYPE_PROXIMITY
345 * reporting-mode: on-change
347 * The proximity sensor which turns the screen off and back on during calls is the
348 * wake-up proximity sensor. Implement wake-up proximity sensor before implementing
349 * a non wake-up proximity sensor. For the wake-up proximity sensor set the flag
350 * SENSOR_FLAG_WAKE_UP.
351 * The value corresponds to the distance to the nearest object in centimeters.
353 #define SENSOR_TYPE_PROXIMITY (8)
354 #define SENSOR_STRING_TYPE_PROXIMITY "android.sensor.proximity"
357 * SENSOR_TYPE_GRAVITY
358 * reporting-mode: continuous
360 * A gravity output indicates the direction of and magnitude of gravity in
361 * the devices's coordinates.
363 * Implement the non-wake-up version of this sensor and implement the wake-up
364 * version if the system possesses a wake up fifo.
366 #define SENSOR_TYPE_GRAVITY (9)
367 #define SENSOR_STRING_TYPE_GRAVITY "android.sensor.gravity"
370 * SENSOR_TYPE_LINEAR_ACCELERATION
371 * reporting-mode: continuous
373 * Indicates the linear acceleration of the device in device coordinates,
374 * not including gravity.
376 * Implement the non-wake-up version of this sensor and implement the wake-up
377 * version if the system possesses a wake up fifo.
379 #define SENSOR_TYPE_LINEAR_ACCELERATION (10)
380 #define SENSOR_STRING_TYPE_LINEAR_ACCELERATION "android.sensor.linear_acceleration"
384 * SENSOR_TYPE_ROTATION_VECTOR
385 * reporting-mode: continuous
387 * The rotation vector symbolizes the orientation of the device relative to the
388 * East-North-Up coordinates frame.
390 * Implement the non-wake-up version of this sensor and implement the wake-up
391 * version if the system possesses a wake up fifo.
393 #define SENSOR_TYPE_ROTATION_VECTOR (11)
394 #define SENSOR_STRING_TYPE_ROTATION_VECTOR "android.sensor.rotation_vector"
397 * SENSOR_TYPE_RELATIVE_HUMIDITY
398 * reporting-mode: on-change
400 * A relative humidity sensor measures relative ambient air humidity and
401 * returns a value in percent.
403 * Both wake-up and non wake-up versions are useful.
405 #define SENSOR_TYPE_RELATIVE_HUMIDITY (12)
406 #define SENSOR_STRING_TYPE_RELATIVE_HUMIDITY "android.sensor.relative_humidity"
409 * SENSOR_TYPE_AMBIENT_TEMPERATURE
410 * reporting-mode: on-change
412 * The ambient (room) temperature in degree Celsius.
414 * Both wake-up and non wake-up versions are useful.
416 #define SENSOR_TYPE_AMBIENT_TEMPERATURE (13)
417 #define SENSOR_STRING_TYPE_AMBIENT_TEMPERATURE "android.sensor.ambient_temperature"
420 * SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED
421 * reporting-mode: continuous
423 * Similar to SENSOR_TYPE_MAGNETIC_FIELD, but the hard iron calibration is
424 * reported separately instead of being included in the measurement.
426 * Implement the non-wake-up version of this sensor and implement the wake-up
427 * version if the system possesses a wake up fifo.
429 #define SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED (14)
430 #define SENSOR_STRING_TYPE_MAGNETIC_FIELD_UNCALIBRATED "android.sensor.magnetic_field_uncalibrated"
433 * SENSOR_TYPE_GAME_ROTATION_VECTOR
434 * reporting-mode: continuous
436 * Similar to SENSOR_TYPE_ROTATION_VECTOR, but not using the geomagnetic
439 * Implement the non-wake-up version of this sensor and implement the wake-up
440 * version if the system possesses a wake up fifo.
442 #define SENSOR_TYPE_GAME_ROTATION_VECTOR (15)
443 #define SENSOR_STRING_TYPE_GAME_ROTATION_VECTOR "android.sensor.game_rotation_vector"
446 * SENSOR_TYPE_GYROSCOPE_UNCALIBRATED
447 * reporting-mode: continuous
449 * All values are in radians/second and measure the rate of rotation
450 * around the X, Y and Z axis.
452 * Implement the non-wake-up version of this sensor and implement the wake-up
453 * version if the system possesses a wake up fifo.
455 #define SENSOR_TYPE_GYROSCOPE_UNCALIBRATED (16)
456 #define SENSOR_STRING_TYPE_GYROSCOPE_UNCALIBRATED "android.sensor.gyroscope_uncalibrated"
459 * SENSOR_TYPE_SIGNIFICANT_MOTION
460 * reporting-mode: one-shot
462 * A sensor of this type triggers an event each time significant motion
463 * is detected and automatically disables itself.
464 * For Significant Motion sensor to be useful, it must be defined as a
465 * wake-up sensor. (set SENSOR_FLAG_WAKE_UP). Implement the wake-up significant motion
466 * sensor. A non wake-up version is not useful.
467 * The only allowed value to return is 1.0.
470 #define SENSOR_TYPE_SIGNIFICANT_MOTION (17)
471 #define SENSOR_STRING_TYPE_SIGNIFICANT_MOTION "android.sensor.significant_motion"
474 * SENSOR_TYPE_STEP_DETECTOR
475 * reporting-mode: special
477 * A sensor of this type triggers an event each time a step is taken
478 * by the user. The only allowed value to return is 1.0 and an event
479 * is generated for each step.
481 * Both wake-up and non wake-up versions are useful.
484 #define SENSOR_TYPE_STEP_DETECTOR (18)
485 #define SENSOR_STRING_TYPE_STEP_DETECTOR "android.sensor.step_detector"
489 * SENSOR_TYPE_STEP_COUNTER
490 * reporting-mode: on-change
492 * A sensor of this type returns the number of steps taken by the user since
493 * the last reboot while activated. The value is returned as a uint64_t and is
494 * reset to zero only on a system / android reboot.
496 * Implement the non-wake-up version of this sensor and implement the wake-up
497 * version if the system possesses a wake up fifo.
500 #define SENSOR_TYPE_STEP_COUNTER (19)
501 #define SENSOR_STRING_TYPE_STEP_COUNTER "android.sensor.step_counter"
504 * SENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR
505 * reporting-mode: continuous
507 * Similar to SENSOR_TYPE_ROTATION_VECTOR, but using a magnetometer instead
508 * of using a gyroscope.
510 * Implement the non-wake-up version of this sensor and implement the wake-up
511 * version if the system possesses a wake up fifo.
513 #define SENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR (20)
514 #define SENSOR_STRING_TYPE_GEOMAGNETIC_ROTATION_VECTOR "android.sensor.geomagnetic_rotation_vector"
517 * SENSOR_TYPE_HEART_RATE
518 * reporting-mode: on-change
520 * A sensor of this type returns the current heart rate.
521 * The events contain the current heart rate in beats per minute (BPM) and the
522 * status of the sensor during the measurement. See heart_rate_event_t for more
525 * Because this sensor is on-change, events must be generated when and only
526 * when heart_rate.bpm or heart_rate.status have changed since the last
527 * event. In particular, upon the first activation, unless the device is known
528 * to not be on the body, the status field of the first event must be set to
529 * SENSOR_STATUS_UNRELIABLE. The event should be generated no faster than every
530 * period_ns passed to setDelay() or to batch().
531 * See the definition of the on-change reporting mode for more information.
533 * sensor_t.requiredPermission must be set to SENSOR_PERMISSION_BODY_SENSORS.
535 * Both wake-up and non wake-up versions are useful.
537 #define SENSOR_TYPE_HEART_RATE (21)
538 #define SENSOR_STRING_TYPE_HEART_RATE "android.sensor.heart_rate"
541 * SENSOR_TYPE_WAKE_UP_TILT_DETECTOR
542 * reporting-mode: special (setDelay has no impact)
544 * A sensor of this type generates an event each time a tilt event is detected. A tilt event
545 * should be generated if the direction of the 2-seconds window average gravity changed by at least
546 * 35 degrees since the activation or the last trigger of the sensor.
547 * reference_estimated_gravity = average of accelerometer measurements over the first
548 * 1 second after activation or the estimated gravity at the last
550 * current_estimated_gravity = average of accelerometer measurements over the last 2 seconds.
551 * trigger when angle (reference_estimated_gravity, current_estimated_gravity) > 35 degrees
553 * Large accelerations without a change in phone orientation should not trigger a tilt event.
554 * For example, a sharp turn or strong acceleration while driving a car should not trigger a tilt
555 * event, even though the angle of the average acceleration might vary by more than 35 degrees.
557 * Typically, this sensor is implemented with the help of only an accelerometer. Other sensors can
558 * be used as well if they do not increase the power consumption significantly. This is a low power
559 * sensor that should allow the AP to go into suspend mode. Do not emulate this sensor in the HAL.
560 * Like other wake up sensors, the driver is expected to a hold a wake_lock with a timeout of 200 ms
561 * while reporting this event. The only allowed return value is 1.0.
563 * Implement only the wake-up version of this sensor.
565 #define SENSOR_TYPE_TILT_DETECTOR (22)
566 #define SENSOR_STRING_TYPE_TILT_DETECTOR "android.sensor.tilt_detector"
569 * SENSOR_TYPE_WAKE_GESTURE
570 * reporting-mode: one-shot
572 * A sensor enabling waking up the device based on a device specific motion.
574 * When this sensor triggers, the device behaves as if the power button was
575 * pressed, turning the screen on. This behavior (turning on the screen when
576 * this sensor triggers) might be deactivated by the user in the device
577 * settings. Changes in settings do not impact the behavior of the sensor:
578 * only whether the framework turns the screen on when it triggers.
580 * The actual gesture to be detected is not specified, and can be chosen by
581 * the manufacturer of the device.
582 * This sensor must be low power, as it is likely to be activated 24/7.
583 * The only allowed value to return is 1.0.
585 * Implement only the wake-up version of this sensor.
587 #define SENSOR_TYPE_WAKE_GESTURE (23)
588 #define SENSOR_STRING_TYPE_WAKE_GESTURE "android.sensor.wake_gesture"
591 * SENSOR_TYPE_GLANCE_GESTURE
592 * reporting-mode: one-shot
594 * A sensor enabling briefly turning the screen on to enable the user to
595 * glance content on screen based on a specific motion. The device should
596 * turn the screen off after a few moments.
598 * When this sensor triggers, the device turns the screen on momentarily
599 * to allow the user to glance notifications or other content while the
600 * device remains locked in a non-interactive state (dozing). This behavior
601 * (briefly turning on the screen when this sensor triggers) might be deactivated
602 * by the user in the device settings. Changes in settings do not impact the
603 * behavior of the sensor: only whether the framework briefly turns the screen on
606 * The actual gesture to be detected is not specified, and can be chosen by
607 * the manufacturer of the device.
608 * This sensor must be low power, as it is likely to be activated 24/7.
609 * The only allowed value to return is 1.0.
611 * Implement only the wake-up version of this sensor.
613 #define SENSOR_TYPE_GLANCE_GESTURE (24)
614 #define SENSOR_STRING_TYPE_GLANCE_GESTURE "android.sensor.glance_gesture"
617 * SENSOR_TYPE_PICK_UP_GESTURE
618 * reporting-mode: one-shot
620 * A sensor of this type triggers when the device is picked up regardless of wherever is was
621 * before (desk, pocket, bag). The only allowed return value is 1.0.
622 * This sensor de-activates itself immediately after it triggers.
624 * Implement only the wake-up version of this sensor.
626 #define SENSOR_TYPE_PICK_UP_GESTURE (25)
627 #define SENSOR_STRING_TYPE_PICK_UP_GESTURE "android.sensor.pick_up_gesture"
630 * SENSOR_TYPE_WRIST_TILT_GESTURE
631 * trigger-mode: special
632 * wake-up sensor: yes
634 * A sensor of this type triggers an event each time a tilt of the wrist-worn
635 * device is detected.
637 * This sensor must be low power, as it is likely to be activated 24/7.
638 * The only allowed value to return is 1.0.
640 * Implement only the wake-up version of this sensor.
642 #define SENSOR_TYPE_WRIST_TILT_GESTURE (26)
643 #define SENSOR_STRING_TYPE_WRIST_TILT_GESTURE "android.sensor.wrist_tilt_gesture"
646 * Values returned by the accelerometer in various locations in the universe.
647 * all values are in SI units (m/s^2)
649 #define GRAVITY_SUN (275.0f)
650 #define GRAVITY_EARTH (9.80665f)
652 /** Maximum magnetic field on Earth's surface */
653 #define MAGNETIC_FIELD_EARTH_MAX (60.0f)
655 /** Minimum magnetic field on Earth's surface */
656 #define MAGNETIC_FIELD_EARTH_MIN (30.0f)
659 * Possible values of the status field of sensor events.
661 #define SENSOR_STATUS_NO_CONTACT -1
662 #define SENSOR_STATUS_UNRELIABLE 0
663 #define SENSOR_STATUS_ACCURACY_LOW 1
664 #define SENSOR_STATUS_ACCURACY_MEDIUM 2
665 #define SENSOR_STATUS_ACCURACY_HIGH 3
689 * uncalibrated gyroscope and magnetometer event data
708 } uncalibrated_event_t;
711 * Meta data event data
713 typedef struct meta_data_event {
719 * Heart rate event data
722 // Heart rate in beats per minute.
723 // Set to 0 when status is SENSOR_STATUS_UNRELIABLE or ..._NO_CONTACT
725 // Status of the sensor for this reading. Set to one SENSOR_STATUS_...
726 // Note that this value should only be set for sensors that explicitly define
727 // the meaning of this field. This field is not piped through the framework
728 // for other sensors.
730 } heart_rate_event_t;
733 * Union of the various types of sensor data
734 * that can be returned.
736 typedef struct sensors_event_t {
737 /* must be sizeof(struct sensors_event_t) */
740 /* sensor identifier */
749 /* time is in nanosecond */
756 /* acceleration values are in meter per second per second (m/s^2) */
757 sensors_vec_t acceleration;
759 /* magnetic vector values are in micro-Tesla (uT) */
760 sensors_vec_t magnetic;
762 /* orientation values are in degrees */
763 sensors_vec_t orientation;
765 /* gyroscope values are in rad/s */
768 /* temperature is in degrees centigrade (Celsius) */
771 /* distance in centimeters */
774 /* light in SI lux units */
777 /* pressure in hectopascal (hPa) */
780 /* relative humidity in percent */
781 float relative_humidity;
783 /* uncalibrated gyroscope values are in rad/s */
784 uncalibrated_event_t uncalibrated_gyro;
786 /* uncalibrated magnetometer values are in micro-Teslas */
787 uncalibrated_event_t uncalibrated_magnetic;
789 /* heart rate data containing value in bpm and status */
790 heart_rate_event_t heart_rate;
792 /* this is a special event. see SENSOR_TYPE_META_DATA above.
793 * sensors_meta_data_event_t events are all reported with a type of
794 * SENSOR_TYPE_META_DATA. The handle is ignored and must be zero.
796 meta_data_event_t meta_data;
803 uint64_t step_counter;
807 /* Reserved flags for internal use. Set to zero. */
810 uint32_t reserved1[3];
814 /* see SENSOR_TYPE_META_DATA */
815 typedef sensors_event_t sensors_meta_data_event_t;
821 * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
822 * and the fields of this data structure must begin with hw_module_t
823 * followed by module specific information.
825 struct sensors_module_t {
826 struct hw_module_t common;
829 * Enumerate all available sensors. The list is returned in "list".
830 * @return number of sensors in the list
832 int (*get_sensors_list)(struct sensors_module_t* module,
833 struct sensor_t const** list);
836 * Place the module in a specific mode. The following modes are defined
838 * 0 - Normal operation. Default state of the module.
839 * 1 - Loopback mode. Data is injected for the the supported
840 * sensors by the sensor service in this mode.
841 * @return 0 on success
842 * -EINVAL if requested mode is not supported
843 * -EPERM if operation is not allowed
845 int (*set_operation_mode)(unsigned int mode);
850 /* Name of this sensor.
851 * All sensors of the same "type" must have a different "name".
855 /* vendor of the hardware part */
858 /* version of the hardware part + driver. The value of this field
859 * must increase when the driver is updated in a way that changes the
860 * output of this sensor. This is important for fused sensors when the
861 * fusion algorithm is updated.
865 /* handle that identifies this sensors. This handle is used to reference
866 * this sensor throughout the HAL API.
870 /* this sensor's type. */
873 /* maximum range of this sensor's value in SI units */
876 /* smallest difference between two values reported by this sensor */
879 /* rough estimate of this sensor's power consumption in mA */
882 /* this value depends on the reporting mode:
884 * continuous: minimum sample period allowed in microseconds
887 * special : 0, unless otherwise noted
891 /* number of events reserved for this sensor in the batch mode FIFO.
892 * If there is a dedicated FIFO for this sensor, then this is the
893 * size of this FIFO. If the FIFO is shared with other sensors,
894 * this is the size reserved for that sensor and it can be zero.
896 uint32_t fifoReservedEventCount;
898 /* maximum number of events of this sensor that could be batched.
899 * This is especially relevant when the FIFO is shared between
900 * several sensors; this value is then set to the size of that FIFO.
902 uint32_t fifoMaxEventCount;
904 /* type of this sensor as a string. Set to corresponding
905 * SENSOR_STRING_TYPE_*.
906 * When defining an OEM specific sensor or sensor manufacturer specific
907 * sensor, use your reserve domain name as a prefix.
908 * ex: com.google.glass.onheaddetector
909 * For sensors of known type, the android framework might overwrite this
910 * string automatically.
912 const char* stringType;
914 /* permission required to see this sensor, register to it and receive data.
915 * Set to "" if no permission is required. Some sensor types like the
916 * heart rate monitor have a mandatory require_permission.
917 * For sensors that always require a specific permission, like the heart
918 * rate monitor, the android framework might overwrite this string
921 const char* requiredPermission;
923 /* This value is defined only for continuous mode and on-change sensors. It is the delay between
924 * two sensor events corresponding to the lowest frequency that this sensor supports. When lower
925 * frequencies are requested through batch()/setDelay() the events will be generated at this
926 * frequency instead. It can be used by the framework or applications to estimate when the batch
929 * NOTE: 1) period_ns is in nanoseconds where as maxDelay/minDelay are in microseconds.
930 * continuous, on-change: maximum sampling period allowed in microseconds.
931 * one-shot, special : 0
932 * 2) maxDelay should always fit within a 32 bit signed integer. It is declared as 64 bit
933 * on 64 bit architectures only for binary compatibility reasons.
934 * Availability: SENSORS_DEVICE_API_VERSION_1_3
942 /* Flags for sensor. See SENSOR_FLAG_* above. Only the least significant 32 bits are used here.
943 * It is declared as 64 bit on 64 bit architectures only for binary compatibility reasons.
944 * Availability: SENSORS_DEVICE_API_VERSION_1_3
952 /* reserved fields, must be zero */
958 * sensors_poll_device_t is used with SENSORS_DEVICE_API_VERSION_0_1
959 * and is present for backward binary and source compatibility.
960 * See the Sensors HAL interface section for complete descriptions of the
961 * following functions:
962 * http://source.android.com/devices/sensors/index.html#hal
964 struct sensors_poll_device_t {
965 struct hw_device_t common;
966 int (*activate)(struct sensors_poll_device_t *dev,
967 int sensor_handle, int enabled);
968 int (*setDelay)(struct sensors_poll_device_t *dev,
969 int sensor_handle, int64_t sampling_period_ns);
970 int (*poll)(struct sensors_poll_device_t *dev,
971 sensors_event_t* data, int count);
975 * struct sensors_poll_device_1 is used in HAL versions >= SENSORS_DEVICE_API_VERSION_1_0
977 typedef struct sensors_poll_device_1 {
979 /* sensors_poll_device_1 is compatible with sensors_poll_device_t,
980 * and can be down-cast to it
982 struct sensors_poll_device_t v0;
985 struct hw_device_t common;
987 /* Activate/de-activate one sensor. Return 0 on success, negative
989 * sensor_handle is the handle of the sensor to change.
990 * enabled set to 1 to enable, or 0 to disable the sensor.
992 * Return 0 on success, negative errno code otherwise.
994 int (*activate)(struct sensors_poll_device_t *dev,
995 int sensor_handle, int enabled);
998 * Set the events's period in nanoseconds for a given sensor.
999 * If sampling_period_ns > max_delay it will be truncated to
1000 * max_delay and if sampling_period_ns < min_delay it will be
1001 * replaced by min_delay.
1003 int (*setDelay)(struct sensors_poll_device_t *dev,
1004 int sensor_handle, int64_t sampling_period_ns);
1007 * Returns an array of sensor data.
1009 int (*poll)(struct sensors_poll_device_t *dev,
1010 sensors_event_t* data, int count);
1016 * Sets a sensor’s parameters, including sampling frequency and maximum
1017 * report latency. This function can be called while the sensor is
1018 * activated, in which case it must not cause any sensor measurements to
1019 * be lost: transitioning from one sampling rate to the other cannot cause
1020 * lost events, nor can transitioning from a high maximum report latency to
1021 * a low maximum report latency.
1022 * See the Batching sensor results page for details:
1023 * http://source.android.com/devices/sensors/batching.html
1025 int (*batch)(struct sensors_poll_device_1* dev,
1026 int sensor_handle, int flags, int64_t sampling_period_ns,
1027 int64_t max_report_latency_ns);
1030 * Flush adds a META_DATA_FLUSH_COMPLETE event (sensors_event_meta_data_t)
1031 * to the end of the "batch mode" FIFO for the specified sensor and flushes
1033 * If the FIFO is empty or if the sensor doesn't support batching (FIFO size zero),
1034 * it should return SUCCESS along with a trivial META_DATA_FLUSH_COMPLETE event added to the
1035 * event stream. This applies to all sensors other than one-shot sensors.
1036 * If the sensor is a one-shot sensor, flush must return -EINVAL and not generate
1037 * any flush complete metadata.
1038 * If the sensor is not active at the time flush() is called, flush() should return
1041 int (*flush)(struct sensors_poll_device_1* dev, int sensor_handle);
1044 * Inject a single sensor sample to be to this device.
1045 * data points to the sensor event to be injected
1046 * @return 0 on success
1047 * -EPERM if operation is not allowed
1048 * -EINVAL if sensor event cannot be injected
1050 int (*inject_sensor_data)(struct sensors_poll_device_1 *dev, const sensors_event_t *data);
1052 void (*reserved_procs[7])(void);
1054 } sensors_poll_device_1_t;
1057 /** convenience API for opening and closing a device */
1059 static inline int sensors_open(const struct hw_module_t* module,
1060 struct sensors_poll_device_t** device) {
1061 return module->methods->open(module,
1062 SENSORS_HARDWARE_POLL, (struct hw_device_t**)device);
1065 static inline int sensors_close(struct sensors_poll_device_t* device) {
1066 return device->common.close(&device->common);
1069 static inline int sensors_open_1(const struct hw_module_t* module,
1070 sensors_poll_device_1_t** device) {
1071 return module->methods->open(module,
1072 SENSORS_HARDWARE_POLL, (struct hw_device_t**)device);
1075 static inline int sensors_close_1(sensors_poll_device_1_t* device) {
1076 return device->common.close(&device->common);
1081 #endif // ANDROID_SENSORS_INTERFACE_H