Exact copy of GCE sensors
Change-Id: If201111cdc3cd327603da3e14f7361f154a0d938
diff --git a/guest/hals/sensors/Android.mk b/guest/hals/sensors/Android.mk
new file mode 100644
index 0000000..a9342c6
--- /dev/null
+++ b/guest/hals/sensors/Android.mk
@@ -0,0 +1,57 @@
+# Copyright (C) 2016 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.
+
+LOCAL_PATH := $(call my-dir)
+
+# HAL module implemenation stored in
+# hw/<SENSORS_HARDWARE_MODULE_ID>.<ro.hardware>.so
+include $(CLEAR_VARS)
+
+ifeq (0, $(shell test $(PLATFORM_SDK_VERSION) -ge 21; echo $$?))
+LOCAL_MODULE_RELATIVE_PATH := hw
+else
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+endif
+LOCAL_MULTILIB := first
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_SHARED_LIBRARIES := \
+ $(GCE_STLPORT_LIBS) \
+ liblog \
+ libcutils \
+ libgcecutils
+
+LOCAL_SRC_FILES := \
+ sensors_hal.cpp \
+ gce_sensors.cpp \
+ sensors.cpp
+
+LOCAL_CFLAGS := -DLOG_TAG=\"GceSensors\" \
+ $(GCE_VERSION_CFLAGS) \
+ -Werror -Wall -Wno-missing-field-initializers -Wno-unused-parameter
+
+LOCAL_C_INCLUDES := \
+ $(GCE_STLPORT_INCLUDES) \
+ device/google/gce/include \
+ system/extras
+
+LOCAL_STATIC_LIBRARIES := \
+ libgcemetadata \
+ libcutils \
+ $(GCE_STLPORT_STATIC_LIBS)
+
+LOCAL_MODULE := sensors.$(VIRTUAL_HARDWARE_TYPE)
+LOCAL_VENDOR_MODULE := true
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/guest/hals/sensors/gce_sensors.cpp b/guest/hals/sensors/gce_sensors.cpp
new file mode 100644
index 0000000..2f7d4aa
--- /dev/null
+++ b/guest/hals/sensors/gce_sensors.cpp
@@ -0,0 +1,529 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+// Google Compute Engine (GCE) Sensors HAL - Sensors HAL Interface
+
+#include <api_level_fixes.h>
+#include <cstdint>
+
+#include <cutils/properties.h>
+#include <cutils/sockets.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/system_properties.h>
+#include <unistd.h>
+
+#include <algorithm>
+
+#include <SharedSelect.h>
+#include <Thunkers.h>
+#include <gce_sensors_message.h>
+#include <remoter_framework_pkt.h>
+#include "gce_sensors.h"
+#include "sensors_hal.h"
+
+using avd::LockGuard;
+using avd::Mutex;
+using avd::time::Milliseconds;
+using avd::time::MonotonicTimePoint;
+using avd::time::Nanoseconds;
+
+namespace avd {
+
+namespace {
+template <typename F>
+struct HWDeviceThunker : ThunkerBase<hw_device_t, GceSensors, F> {};
+template <typename F>
+struct SensorsThunker : ThunkerBase<sensors_poll_device_t, GceSensors, F> {};
+template <typename F>
+struct SensorsThunker1 : ThunkerBase<sensors_poll_device_1, GceSensors, F> {};
+template <typename F>
+struct SensorsThreadThunker : ThunkerBase<void, GceSensors, F> {};
+}
+
+int GceSensors::total_sensor_count_ = -1;
+SensorInfo* GceSensors::sensor_infos_ = NULL;
+const int GceSensors::kInjectedEventWaitPeriods = 3;
+const Nanoseconds GceSensors::kInjectedEventWaitTime =
+ Nanoseconds(Milliseconds(20));
+
+GceSensors::GceSensors()
+ : sensors_poll_device_1(), deadline_change_(&sensor_state_lock_) {
+ if (total_sensor_count_ == -1) {
+ RegisterSensors();
+ }
+
+ // Create a pair of FDs that would be used to control the
+ // receiver thread.
+ if (control_sender_socket_->IsOpen() || control_receiver_socket_->IsOpen()) {
+ ALOGE("%s: Receiver control FDs are opened", __FUNCTION__);
+ }
+ if (!avd::SharedFD::Pipe(&control_receiver_socket_,
+ &control_sender_socket_)) {
+ ALOGE("%s: Unable to create thread control FDs: %d -> %s", __FUNCTION__,
+ errno, strerror(errno));
+ }
+
+ // Create the correct number of holding buffers for this client.
+ sensor_states_.resize(total_sensor_count_);
+ int i;
+ for (i = 0; i < total_sensor_count_; i++) {
+ sensor_states_[i] = new SensorState(sensor_infos_[i]);
+ }
+}
+
+GceSensors::~GceSensors() {
+ int i;
+ for (i = 0; i < total_sensor_count_; i++) {
+ delete sensor_states_[i];
+ }
+}
+
+int GceSensors::GetSensorsList(struct sensors_module_t* /*module*/,
+ struct sensor_t const** list) {
+ *list = sensor_infos_;
+ return total_sensor_count_;
+}
+
+int GceSensors::SetOperationMode(unsigned int /* is_loopback_mode */) {
+ return -EINVAL;
+}
+
+int GceSensors::Open(const struct hw_module_t* module, const char* name,
+ struct hw_device_t** device) {
+ int status = -EINVAL;
+
+ if (!strcmp(name, SENSORS_HARDWARE_POLL)) {
+ // Create a new GceSensors object and set all the fields/functions
+ // to their default values.
+ GceSensors* rval = new GceSensors;
+
+ rval->common.tag = HARDWARE_DEVICE_TAG;
+ rval->common.version = GCE_SENSOR_DEVICE_VERSION;
+ rval->common.module = (struct hw_module_t*)module;
+ rval->common.close = HWDeviceThunker<int()>::call<&GceSensors::Close>;
+ rval->poll =
+ SensorsThunker<int(sensors_event_t*, int)>::call<&GceSensors::Poll>;
+ rval->activate = SensorsThunker<int(int, int)>::call<&GceSensors::Activate>;
+ rval->setDelay =
+ SensorsThunker<int(int, int64_t)>::call<&GceSensors::SetDelay>;
+#if GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_0)
+ rval->batch = SensorsThunker1<int(int, int, int64_t,
+ int64_t)>::call<&GceSensors::Batch>;
+#endif
+#if GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_1)
+ rval->flush = SensorsThunker1<int(int)>::call<&GceSensors::Flush>;
+#endif
+#if GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_4)
+ rval->inject_sensor_data = SensorsThunker1<int(
+ const sensors_event_t*)>::call<&GceSensors::InjectSensorData>;
+#endif
+
+ // Spawn a thread to listen for incoming data from the remoter.
+ int err = pthread_create(
+ &rval->receiver_thread_, NULL,
+ SensorsThreadThunker<void*()>::call<&GceSensors::Receiver>, rval);
+ if (err) {
+ ALOGE("GceSensors::%s: Unable to start receiver thread (%s)",
+ __FUNCTION__, strerror(err));
+ }
+
+ *device = &rval->common;
+ status = 0;
+ }
+ return status;
+}
+
+int GceSensors::Close() {
+ // Make certain the receiver thread wakes up.
+ SensorControlMessage msg;
+ msg.message_type = THREAD_STOP;
+ SendControlMessage(msg);
+ pthread_join(receiver_thread_, NULL);
+ delete this;
+ return 0;
+}
+
+int GceSensors::Activate(int handle, int enabled) {
+ if (handle < 0 || handle >= total_sensor_count_) {
+ ALOGE("GceSensors::%s: Bad handle %d", __FUNCTION__, handle);
+ return -1;
+ }
+
+ {
+ LockGuard<Mutex> guard(sensor_state_lock_);
+ // Update the report deadline, if changed.
+ if (enabled && !sensor_states_[handle]->enabled_) {
+ sensor_states_[handle]->deadline_ =
+ MonotonicTimePoint::Now() + sensor_states_[handle]->sampling_period_;
+ } else if (!enabled && sensor_states_[handle]->enabled_) {
+ sensor_states_[handle]->deadline_ = SensorState::kInfinity;
+ }
+ sensor_states_[handle]->enabled_ = enabled;
+ UpdateDeadline();
+ }
+
+ D("sensor_activate(): handle %d, enabled %d", handle, enabled);
+ if (!UpdateRemoterState(handle)) {
+ ALOGE("Failed to notify remoter about new sensor enable/disable.");
+ }
+ return 0;
+}
+
+int GceSensors::SetDelay(int handle, int64_t sampling_period_ns) {
+ if (handle < 0 || handle >= total_sensor_count_) {
+ ALOGE("GceSensors::%s: Bad handle %d", __FUNCTION__, handle);
+ return -1;
+ }
+ int64_t min_delay_ns = sensor_infos_[handle].minDelay * 1000;
+ if (sampling_period_ns < min_delay_ns) {
+ sampling_period_ns = min_delay_ns;
+ }
+
+ {
+ LockGuard<Mutex> guard(sensor_state_lock_);
+ sensor_states_[handle]->deadline_ -=
+ sensor_states_[handle]->sampling_period_;
+ sensor_states_[handle]->sampling_period_ = Nanoseconds(sampling_period_ns);
+ sensor_states_[handle]->deadline_ +=
+ sensor_states_[handle]->sampling_period_;
+ // If our sampling period has decreased, our deadline
+ // could have already passed. If so, report immediately, but not in the
+ // past.
+ MonotonicTimePoint now = MonotonicTimePoint::Now();
+ if (sensor_states_[handle]->deadline_ < now) {
+ sensor_states_[handle]->deadline_ = now;
+ }
+ UpdateDeadline();
+ }
+
+ D("sensor_set_delay(): handle %d, delay (ms) %" PRId64, handle,
+ Milliseconds(Nanoseconds(sampling_period_ns)).count());
+ if (!UpdateRemoterState(handle)) {
+ ALOGE("Failed to notify remoter about new sensor delay.");
+ }
+ return 0;
+}
+
+int GceSensors::Poll(sensors_event_t* data, int count_unsafe) {
+ if (count_unsafe <= 0) {
+ ALOGE("Framework polled with bad count (%d)", count_unsafe);
+ return -1;
+ }
+ size_t count = size_t(count_unsafe);
+
+ // Poll will block until 1 of 2 things happens:
+ // 1. The next deadline for some active sensor
+ // occurs.
+ // 2. The next deadline changes (either because
+ // a sensor was activated/deactivated or its
+ // delay changed).
+ // In both cases, any sensors whose report deadlines
+ // have passed will report their data (or mock data),
+ // and poll will either return (if at least one deadline
+ // has passed), or repeat by blocking until the next deadline.
+ LockGuard<Mutex> guard(sensor_state_lock_);
+ current_deadline_ = UpdateDeadline();
+ // Sleep until we have something to report
+ while (!fifo_.size()) {
+ deadline_change_.WaitUntil(current_deadline_);
+ current_deadline_ = UpdateDeadline();
+ }
+ // Copy the events from the buffer
+ int num_copied = std::min(fifo_.size(), count);
+ FifoType::iterator first_uncopied = fifo_.begin() + num_copied;
+ std::copy(fifo_.begin(), first_uncopied, data);
+ fifo_.erase(fifo_.begin(), first_uncopied);
+ D("Reported %d sensor events. First: %d %f %f %f", num_copied, data->sensor,
+ data->data[0], data->data[1], data->data[2]);
+ return num_copied;
+}
+
+
+void *GceSensors::Receiver() {
+ // Initialize the server.
+ sensor_listener_socket_ = avd::SharedFD::SocketSeqPacketServer(
+ gce_sensors_message::kSensorsHALSocketName, 0777);
+ if (!sensor_listener_socket_->IsOpen()) {
+ ALOGE("GceSensors::%s: Could not listen for sensor connections. (%s).",
+ __FUNCTION__, sensor_listener_socket_->StrError());
+ return NULL;
+ }
+ D("GceSensors::%s: Listening for sensor connections at %s", __FUNCTION__,
+ gce_sensors_message::kSensorsHALSocketName);
+ // Announce that we are ready for the remoter to connect.
+ if (!NotifyRemoter()) {
+ ALOGI("Failed to notify remoter that HAL is ready.");
+ } else {
+ ALOGI("Notified remoter that HAL is ready.");
+ }
+
+ typedef std::vector<avd::SharedFD> FDVec;
+ FDVec connected;
+ // Listen for incoming sensor data and control messages
+ // from the HAL.
+ while (true) {
+ avd::SharedFDSet fds;
+ for (FDVec::iterator it = connected.begin(); it != connected.end(); ++it) {
+ fds.Set(*it);
+ }
+ fds.Set(control_receiver_socket_);
+ fds.Set(sensor_listener_socket_);
+ int res = avd::Select(&fds, NULL, NULL, NULL);
+ if (res == -1) {
+ ALOGE("%s: select returned %d and failed %d -> %s", __FUNCTION__, res,
+ errno, strerror(errno));
+ break;
+ } else if (res == 0) {
+ ALOGE("%s: select timed out", __FUNCTION__);
+ break;
+ } else if (fds.IsSet(sensor_listener_socket_)) {
+ connected.push_back(avd::SharedFD::Accept(*sensor_listener_socket_));
+ ALOGI("GceSensors::%s: new client connected", __FUNCTION__);
+ } else if (fds.IsSet(control_receiver_socket_)) {
+ // We received a control message.
+ SensorControlMessage msg;
+ int res =
+ control_receiver_socket_->Read(&msg, sizeof(SensorControlMessage));
+ if (res == -1) {
+ ALOGE("GceSensors::%s: Failed to receive control message.",
+ __FUNCTION__);
+ } else if (res == 0) {
+ ALOGE("GceSensors::%s: Control connection closed.", __FUNCTION__);
+ }
+ if (msg.message_type == SENSOR_STATE_UPDATE) {
+ // Forward the update to the remoter.
+ remoter_request_packet packet;
+ remoter_request_packet_init(&packet, kRemoterSensorState, 0);
+ {
+ LockGuard<Mutex> guard(sensor_state_lock_);
+ packet.params.sensor_state_params.type =
+ sensor_infos_[msg.sensor_handle].type;
+ packet.params.sensor_state_params.enabled =
+ sensor_states_[msg.sensor_handle]->enabled_;
+ packet.params.sensor_state_params.delay_ns =
+ sensor_states_[msg.sensor_handle]->sampling_period_.count();
+ packet.params.sensor_state_params.handle = msg.sensor_handle;
+ }
+ struct msghdr msg;
+ iovec msg_iov[1];
+ msg_iov[0].iov_base = &packet;
+ msg_iov[0].iov_len = sizeof(remoter_request_packet);
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_iov = msg_iov;
+ msg.msg_iovlen = arraysize(msg_iov);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ for (FDVec::iterator it = connected.begin(); it != connected.end();
+ ++it) {
+ avd::SharedFD &fd = *it;
+ if (fd->SendMsg(&msg, 0) == -1) {
+ ALOGE("GceSensors::%s. Could not send sensor state (%s).",
+ __FUNCTION__, fd->StrError());
+ }
+ }
+ }
+ if (msg.message_type == THREAD_STOP) {
+ D("Received terminate control message.");
+ return NULL;
+ }
+ } else {
+ for (FDVec::iterator it = connected.begin(); it != connected.end();
+ ++it) {
+ avd::SharedFD &fd = *it;
+ if (fds.IsSet(fd)) {
+ // We received a sensor update from remoter.
+ sensors_event_t event;
+ struct msghdr msg;
+ iovec msg_iov[1];
+ msg_iov[0].iov_base = &event;
+ msg_iov[0].iov_len = sizeof(event);
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_iov = msg_iov;
+ msg.msg_iovlen = arraysize(msg_iov);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+ int res = fd->RecvMsg(&msg, 0);
+ if (res <= 0) {
+ if (res == 0) {
+ ALOGE("GceSensors::%s: Sensors HAL connection closed.",
+ __FUNCTION__);
+ } else {
+ ALOGE("GceSensors::%s: Failed to receive sensor message",
+ __FUNCTION__);
+ }
+ connected.erase(std::find(connected.begin(), connected.end(), fd));
+ break;
+ }
+
+ // We received an event from the remoter.
+ if (event.sensor < 0 || event.sensor >= total_sensor_count_) {
+ ALOGE("Remoter sent us an invalid sensor event! (handle %d)",
+ event.sensor);
+ connected.erase(std::find(connected.begin(), connected.end(), fd));
+ break;
+ }
+
+ D("Received sensor event: %d %f %f %f", event.sensor, event.data[0],
+ event.data[1], event.data[2]);
+
+ {
+ LockGuard<Mutex> guard(sensor_state_lock_);
+ // Increase the delay so that the HAL knows
+ // it shouldn't report on its own for a while.
+ SensorState *holding_buffer = sensor_states_[event.sensor];
+ int wait_periods =
+ std::max(kInjectedEventWaitPeriods,
+ (int)(kInjectedEventWaitTime.count() /
+ holding_buffer->sampling_period_.count()));
+ holding_buffer->deadline_ =
+ MonotonicTimePoint::Now() +
+ holding_buffer->sampling_period_ * wait_periods;
+ holding_buffer->event_.data[0] = event.data[0];
+ holding_buffer->event_.data[1] = event.data[1];
+ holding_buffer->event_.data[2] = event.data[2];
+ // Signal the HAL to report the newly arrived event.
+ fifo_.push_back(event);
+ deadline_change_.NotifyOne();
+ }
+ }
+ }
+ }
+ }
+ return NULL;
+}
+
+bool GceSensors::NotifyRemoter() {
+ remoter_request_packet packet;
+ remoter_request_packet_init(&packet, kRemoterHALReady, 0);
+ packet.send_response = 0;
+ strncpy(packet.params.hal_ready_params.unix_socket,
+ gce_sensors_message::kSensorsHALSocketName,
+ sizeof(packet.params.hal_ready_params.unix_socket));
+ AutoCloseFileDescriptor remoter_socket(remoter_connect());
+ if (remoter_socket.IsError()) {
+ D("GceSensors::%s: Could not connect to remoter to notify ready (%s).",
+ __FUNCTION__, strerror(errno));
+ return false;
+ }
+ int err =
+ remoter_do_single_request_with_socket(remoter_socket, &packet, NULL);
+ if (err == -1) {
+ D("GceSensors::%s: Notify remoter ready: Failed after connect (%s).",
+ __FUNCTION__, strerror(errno));
+ return false;
+ }
+ D("GceSensors::%s: Notify remoter ready Succeeded.", __FUNCTION__);
+ return true;
+}
+
+static bool CompareTimestamps(const sensors_event_t& a,
+ const sensors_event_t& b) {
+ return a.timestamp < b.timestamp;
+}
+
+MonotonicTimePoint GceSensors::UpdateDeadline() {
+ // Get the minimum of all the current deadlines.
+ MonotonicTimePoint now = MonotonicTimePoint::Now();
+ MonotonicTimePoint min = SensorState::kInfinity;
+ int i = 0;
+ bool sort_fifo = false;
+
+ for (i = 0; i < total_sensor_count_; i++) {
+ SensorState* holding_buffer = sensor_states_[i];
+ // Ignore disabled sensors.
+ if (!holding_buffer->enabled_) {
+ continue;
+ }
+ while (holding_buffer->deadline_ < now) {
+ sensors_event_t data = holding_buffer->event_;
+ data.timestamp = holding_buffer->deadline_.SinceEpoch().count();
+ fifo_.push_back(data);
+ holding_buffer->deadline_ += holding_buffer->sampling_period_;
+ sort_fifo = true;
+ }
+ // Now check if we should update the wake time based on the next event
+ // from this sensor.
+ if (sensor_states_[i]->deadline_ < min) {
+ min = sensor_states_[i]->deadline_;
+ }
+ }
+ // We added one or more sensor readings, so do a sort.
+ // This is likely to be cheaper than a traditional priority queue because
+ // a priority queue would try to keep its state correct for each addition.
+ if (sort_fifo) {
+ std::sort(fifo_.begin(), fifo_.end(), CompareTimestamps);
+ }
+ // If we added events or the deadline is lower notify the thread in Poll().
+ // If the deadline went up, don't do anything.
+ if (fifo_.size() || (min < current_deadline_)) {
+ deadline_change_.NotifyOne();
+ }
+ return min;
+}
+
+bool GceSensors::UpdateRemoterState(int handle) {
+ SensorControlMessage msg;
+ msg.message_type = SENSOR_STATE_UPDATE;
+ msg.sensor_handle = handle;
+ return SendControlMessage(msg);
+}
+
+bool GceSensors::SendControlMessage(SensorControlMessage msg) {
+ if (!control_sender_socket_->IsOpen()) {
+ ALOGE("%s: Can't send control message %d, control socket not open.",
+ __FUNCTION__, msg.message_type);
+ return false;
+ }
+ if (control_sender_socket_->Write(&msg, sizeof(SensorControlMessage)) == -1) {
+ ALOGE("GceSensors::%s. Could not send control message %d (%s).",
+ __FUNCTION__, msg.message_type, control_sender_socket_->StrError());
+ return false;
+ }
+ return true;
+}
+
+int GceSensors::RegisterSensors() {
+ if (total_sensor_count_ != -1) {
+ return -1;
+ }
+ total_sensor_count_ = 9;
+ sensor_infos_ = new SensorInfo[total_sensor_count_];
+ sensor_infos_[sensors_constants::kAccelerometerHandle] =
+ AccelerometerSensor();
+ sensor_infos_[sensors_constants::kGyroscopeHandle] = GyroscopeSensor();
+ sensor_infos_[sensors_constants::kLightHandle] = LightSensor();
+ sensor_infos_[sensors_constants::kMagneticFieldHandle] =
+ MagneticFieldSensor();
+ sensor_infos_[sensors_constants::kPressureHandle] = PressureSensor();
+ sensor_infos_[sensors_constants::kProximityHandle] = ProximitySensor();
+ sensor_infos_[sensors_constants::kAmbientTempHandle] = AmbientTempSensor();
+ sensor_infos_[sensors_constants::kDeviceTempHandle] = DeviceTempSensor();
+ sensor_infos_[sensors_constants::kRelativeHumidityHandle] =
+ RelativeHumiditySensor();
+ int i;
+ for (i = 0; i < total_sensor_count_; i++) {
+ D("Found sensor %s with handle %d", sensor_infos_[i].name,
+ sensor_infos_[i].handle);
+ }
+ return total_sensor_count_;
+}
+
+} // namespace avd
diff --git a/guest/hals/sensors/gce_sensors.h b/guest/hals/sensors/gce_sensors.h
new file mode 100644
index 0000000..b06f0d1
--- /dev/null
+++ b/guest/hals/sensors/gce_sensors.h
@@ -0,0 +1,247 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+// Google Compute Engine (GCE) Sensors HAL - Sensors HAL Interface
+#ifndef DEVICE_GOOGLE_GCE_SENSORS_GCE_SENSORS_H
+#define DEVICE_GOOGLE_GCE_SENSORS_GCE_SENSORS_H
+
+#include <vector>
+
+#include <Pthread.h>
+#include <SharedFD.h>
+
+#include "remoter_framework_pkt.h"
+
+#include "sensors_hal.h"
+#include "sensors.h"
+
+namespace avd {
+
+// Used for sending control messages to the receiver thread.
+// The sensor_handle field may be left unused if it is not needed.
+enum ControlMessageType {
+ THREAD_STOP,
+ SENSOR_STATE_UPDATE
+};
+typedef struct {
+ ControlMessageType message_type;
+ uint8_t sensor_handle;
+} SensorControlMessage;
+
+#if GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_0)
+// Last updated to HAL 1.4
+// Version history:
+// Before jb, jb-mr1 SENSORS_DEVICE_API_VERSION_0_1 (no version in sensors.h)
+// jb-mr2: SENSORS_DEVICE_API_VERSION_1_0
+// k: SENSORS_DEVICE_API_VERSION_1_1
+// l, l-mr1: SENSORS_DEVICE_API_VERSION_1_3
+// m, n, n-mr1: SENSORS_DEVICE_API_VERSION_1_4
+#else
+// Pre-1.0 sensors do not define the sensors_poll_device_1 type.
+typedef sensors_poll_device_t sensors_poll_device_1;
+#endif
+
+class GceSensors : public sensors_poll_device_1 {
+ public:
+ GceSensors();
+ ~GceSensors();
+
+ /**
+ ** SENSOR HAL API FUNCTIONS FOR MODULE
+ **/
+
+ // Gets a list of all supported sensors and stores in list.
+ // Returns the number of supported sensors.
+ static int GetSensorsList(struct sensors_module_t* module,
+ struct sensor_t const** list);
+
+ // Place the module in a specific mode. The following modes are defined
+ //
+ // 0 - Normal operation. Default state of the module.
+ // 1 - Loopback mode. Data is injected for the supported
+ // sensors by the sensor service in this mode.
+ // @return 0 on success
+ // -EINVAL if requested mode is not supported
+ // -EPERM if operation is not allowed
+ static int SetOperationMode(unsigned int mode);
+
+
+ /**
+ ** SENSOR HAL API FUNCTIONS FOR DEVICE
+ **/
+ // Opens the device.
+ static int Open(const struct hw_module_t* module, const char* name,
+ struct hw_device_t** device);
+
+ // Closes the device, closing all sensors.
+ int Close();
+
+ // Activate (or deactivate) the sensor with the given handle.
+ //
+ // One-shot sensors deactivate themselves automatically upon receiving an
+ // event, and they must still accept to be deactivated through a call to
+ // activate(..., enabled=0).
+ // Non-wake-up sensors never prevent the SoC from going into suspend mode;
+ // that is, the HAL shall not hold a partial wake-lock on behalf of
+ // applications.
+ //
+ // If enabled is 1 and the sensor is already activated, this function is a
+ // no-op and succeeds.
+ //
+ // If enabled is 0 and the sensor is already deactivated, this function is a
+ // no-op and succeeds.
+ //
+ // This function returns 0 on success and a negative error number otherwise.
+ int Activate(int handle, int enabled);
+
+ // Sets the delay (in ns) for the sensor with the given handle.
+ // Deprecated as of HAL 1.1
+ // Called after activate()
+ int SetDelay(int handle, int64_t sampling_period_ns);
+
+ // Returns an array of sensor data by filling the data argument.
+ // This function must block until events are available. It will return
+ // the number of events read on success, or a negative number in case of
+ // an error.
+ int Poll(sensors_event_t* data, int count);
+
+#if GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_0)
+ // Sets a sensor’s parameters, including sampling frequency and maximum
+ // report latency. This function can be called while the sensor is
+ // activated, in which case it must not cause any sensor measurements to
+ // be lost: transitioning from one sampling rate to the other cannot cause
+ // lost events, nor can transitioning from a high maximum report latency to
+ // a low maximum report latency.
+ //
+ // Before SENSORS_DEVICE_API_VERSION_1_3, flags included:
+ // SENSORS_BATCH_DRY_RUN
+ // SENSORS_BATCH_WAKE_UPON_FIFO_FULL
+ //
+ // After SENSORS_DEVICE_API_VERSION_1_3 see WAKE_UPON_FIFO_FULL
+ // in sensor_t.flags
+ int Batch(int sensor_handle, int flags, int64_t sampling_period_ns,
+ int64_t max_report_latency_ns) {
+ // TODO: Add support for maximum report latency with max_report_latency_ns.
+ return SetDelay(sensor_handle, sampling_period_ns);
+ }
+#endif
+
+#if GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_1)
+ // Adds a META_DATA_FLUSH_COMPLETE event (sensors_event_meta_data_t)
+ // to the end of the "batch mode" FIFO for the specified sensor and flushes
+ // the FIFO.
+ //
+ // If the FIFO is empty or if the sensor doesn't support batching (FIFO
+ // size zero), it should return SUCCESS along with a trivial
+ // META_DATA_FLUSH_COMPLETE event added to the event stream. This applies to
+ // all sensors other than one-shot sensors.
+ //
+ // If the sensor is a one-shot sensor, flush must return -EINVAL and not
+ // generate any flush complete metadata.
+ //
+ // If the sensor is not active at the time flush() is called, flush() should
+ // return -EINVAL.
+ int Flush(int sensor_handle) {
+ return -EINVAL;
+ }
+#endif
+
+#if GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_4)
+ // Inject a single sensor sample to be to this device.
+ // data points to the sensor event to be injected
+ // @return 0 on success
+ // -EPERM if operation is not allowed
+ // -EINVAL if sensor event cannot be injected
+ int InjectSensorData(const sensors_event_t *data) {
+ return -EINVAL;
+ }
+#endif
+
+ private:
+ typedef std::vector<SensorState*> SensorStateVector;
+ typedef std::vector<sensors_event_t> FifoType;
+ // Total number of sensors supported by this HAL.
+ static int total_sensor_count_;
+ // Vector of static sensor information for sensors supported by this HAL.
+ // Indexed by the handle. Length must always be equal to total_sensor_count_.
+ static SensorInfo* sensor_infos_;
+ // Vector of sensor state information, indexed by the handle.
+ // Assumption here is that the sensor handles will start at 0 and be
+ // contiguous up to the number of supported sensors.
+ SensorStateVector sensor_states_;
+ // Keep track of the time when the thread in Poll() is scheduled to wake.
+ avd::time::MonotonicTimePoint current_deadline_;
+
+ // Ordered set of sensor values.
+ // TODO(ghartman): Simulate FIFO overflow.
+ FifoType fifo_;
+ // Thread to handle new connections.
+ pthread_t receiver_thread_;
+ // Socket to receive sensor events on.
+ avd::SharedFD sensor_listener_socket_;
+ // Socket for listener thread to receive control messages.
+ avd::SharedFD control_receiver_socket_;
+ // Socket to send control messages to listener thread.
+ avd::SharedFD control_sender_socket_;
+
+ // Lock to protect shared state, including
+ // sensor_states_ and next_deadline_.
+ // Associated with deadline_change_ condition variable.
+ avd::Mutex sensor_state_lock_;
+ // Condition variable to signal changes in the deadline.
+ avd::ConditionVariable deadline_change_;
+
+ // When events are arriving from a client, we report only
+ // when they arrive, rather than at a fixed cycle. After not
+ // receiving a real event for both a given number of periods
+ // and a given time period, we will give up and resume
+ // sending mock events.
+ const static int kInjectedEventWaitPeriods;
+ const static avd::time::Nanoseconds kInjectedEventWaitTime;
+
+ /**
+ ** UTILITY FUNCTIONS
+ **/
+
+ // Receive data from remoter.
+ void* Receiver();
+
+ // Notifies the remoter that the HAL is awake and ready.
+ inline bool NotifyRemoter();
+
+ // Looks through all active sensor deadlines, and finds the one that
+ // is coming up next. If this is not next_deadline_, then the deadline
+ // has changed. Update it and signal the Poll thread.
+ // This should be called anytime the next deadline may have changed.
+ // Can only be called while holding sensor_state_lock_.
+ // Returns true if the deadline has changed.
+ avd::time::MonotonicTimePoint UpdateDeadline();
+
+ // Sends an update for the sensor with the given handle to the remoter.
+ // Update will be enqueued for receiver, not send immediately.
+ inline bool UpdateRemoterState(int handle);
+
+ // Sends a control event to the listener.
+ inline bool SendControlMessage(SensorControlMessage msg);
+
+ // Populates the list of static sensor info. Returns the number
+ // of sensors supported. Should only be called once.
+ static inline int RegisterSensors();
+
+};
+
+} //namespace avd
+
+#endif
diff --git a/guest/hals/sensors/gce_sensors_message.h b/guest/hals/sensors/gce_sensors_message.h
new file mode 100644
index 0000000..d1c67ac
--- /dev/null
+++ b/guest/hals/sensors/gce_sensors_message.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2016 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 DEVICE_GOOGLE_GCE_INCLUDE_SENSORS_MESSAGE_H_
+#define DEVICE_GOOGLE_GCE_INCLUDE_SENSORS_MESSAGE_H_
+
+#include <hardware/hardware.h>
+#include <hardware/sensors.h>
+
+struct gce_sensors_message : sensors_event_t {
+ static const char* kSensorsHALSocketName;
+};
+
+#endif
diff --git a/guest/hals/sensors/sensors.cpp b/guest/hals/sensors/sensors.cpp
new file mode 100644
index 0000000..b2f2665
--- /dev/null
+++ b/guest/hals/sensors/sensors.cpp
@@ -0,0 +1,198 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+// Google Compute Engine (GCE) Sensors HAL - Sensors HAL State
+
+#include <limits>
+
+#include "sensors.h"
+
+namespace avd {
+namespace {
+const avd::time::Milliseconds kDefaultSamplingRate(200);
+
+#if !GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_3)
+namespace {
+const int SENSOR_FLAG_WAKE_UP = 0;
+}
+#endif
+
+timespec infinity() {
+ timespec ts;
+ ts.tv_sec = std::numeric_limits<time_t>::max();
+ ts.tv_nsec = 0;
+ return ts;
+}
+} // namespace
+
+const avd::time::MonotonicTimePoint SensorState::kInfinity =
+ avd::time::MonotonicTimePoint(infinity());
+
+SensorState::SensorState(SensorInfo info)
+ : enabled_(false),
+ event_(),
+ deadline_(kInfinity),
+ sampling_period_(kDefaultSamplingRate) {
+ event_.sensor = info.handle;
+ event_.type = info.type;
+}
+
+SensorInfo::SensorInfo(const char* name, const char* vendor, int version,
+ int handle, int type, float max_range, float resolution,
+ float power, int32_t min_delay,
+ uint32_t fifo_reserved_event_count,
+ uint32_t fifo_max_event_count, const char* string_type,
+ const char* required_permission, int32_t max_delay,
+ uint32_t reporting_mode) {
+ this->name = name;
+ this->vendor = vendor;
+ this->version = version;
+ this->handle = handle;
+ this->type = type;
+ this->maxRange = max_range;
+ this->resolution = resolution;
+ this->power = power;
+ this->minDelay = min_delay;
+#if GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_1)
+ this->fifoReservedEventCount = fifo_reserved_event_count;
+ this->fifoMaxEventCount = fifo_max_event_count;
+#endif
+#if GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_2)
+ this->stringType = string_type;
+ this->requiredPermission = required_permission;
+#endif
+#if GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_3)
+ this->maxDelay = max_delay;
+ this->flags = reporting_mode;
+#endif
+}
+
+namespace sc = sensors_constants;
+
+SensorInfo AccelerometerSensor() {
+ uint32_t flags = sc::kAccelerometerReportingMode |
+ (sc::kAccelerometerIsWakeup ? SENSOR_FLAG_WAKE_UP : 0);
+
+ return SensorInfo(sc::kAccelerometerName, sc::kVendor, sc::kVersion,
+ sc::kAccelerometerHandle, SENSOR_TYPE_ACCELEROMETER,
+ sc::kAccelerometerMaxRange, sc::kAccelerometerResolution,
+ sc::kAccelerometerPower, sc::kAccelerometerMinDelay,
+ sc::kFifoReservedEventCount, sc::kFifoMaxEventCount,
+ sc::kAccelerometerStringType, sc::kRequiredPermission,
+ sc::kMaxDelay, flags);
+}
+
+SensorInfo GyroscopeSensor() {
+ uint32_t flags = sc::kGyroscopeReportingMode |
+ (sc::kGyroscopeIsWakeup ? SENSOR_FLAG_WAKE_UP : 0);
+
+ return SensorInfo(
+ sc::kGyroscopeName, sc::kVendor, sc::kVersion, sc::kGyroscopeHandle,
+ SENSOR_TYPE_GYROSCOPE, sc::kGyroscopeMaxRange, sc::kGyroscopeResolution,
+ sc::kGyroscopePower, sc::kGyroscopeMinDelay, sc::kFifoReservedEventCount,
+ sc::kFifoMaxEventCount, sc::kGyroscopeStringType, sc::kRequiredPermission,
+ sc::kMaxDelay, flags);
+}
+
+SensorInfo LightSensor() {
+ uint32_t flags = sc::kLightReportingMode |
+ (sc::kLightIsWakeup ? SENSOR_FLAG_WAKE_UP : 0);
+
+ return SensorInfo(sc::kLightName, sc::kVendor, sc::kVersion, sc::kLightHandle,
+ SENSOR_TYPE_LIGHT, sc::kLightMaxRange, sc::kLightResolution,
+ sc::kLightPower, sc::kLightMinDelay,
+ sc::kFifoReservedEventCount, sc::kFifoMaxEventCount,
+ sc::kLightStringType, sc::kRequiredPermission,
+ sc::kMaxDelay, flags);
+}
+
+SensorInfo MagneticFieldSensor() {
+ uint32_t flags = sc::kMagneticFieldReportingMode |
+ (sc::kMagneticFieldIsWakeup ? SENSOR_FLAG_WAKE_UP : 0);
+
+ return SensorInfo(sc::kMagneticFieldName, sc::kVendor, sc::kVersion,
+ sc::kMagneticFieldHandle, SENSOR_TYPE_MAGNETIC_FIELD,
+ sc::kMagneticFieldMaxRange, sc::kMagneticFieldResolution,
+ sc::kMagneticFieldPower, sc::kMagneticFieldMinDelay,
+ sc::kFifoReservedEventCount, sc::kFifoMaxEventCount,
+ sc::kMagneticFieldStringType, sc::kRequiredPermission,
+ sc::kMaxDelay, flags);
+}
+
+SensorInfo PressureSensor() {
+ uint32_t flags = sc::kPressureReportingMode |
+ (sc::kPressureIsWakeup ? SENSOR_FLAG_WAKE_UP : 0);
+
+ return SensorInfo(
+ sc::kPressureName, sc::kVendor, sc::kVersion, sc::kPressureHandle,
+ SENSOR_TYPE_PRESSURE, sc::kPressureMaxRange, sc::kPressureResolution,
+ sc::kPressurePower, sc::kPressureMinDelay, sc::kFifoReservedEventCount,
+ sc::kFifoMaxEventCount, sc::kPressureStringType, sc::kRequiredPermission,
+ sc::kMaxDelay, flags);
+}
+
+SensorInfo ProximitySensor() {
+ uint32_t flags = sc::kProximityReportingMode |
+ (sc::kProximityIsWakeup ? SENSOR_FLAG_WAKE_UP : 0);
+
+ return SensorInfo(
+ sc::kProximityName, sc::kVendor, sc::kVersion, sc::kProximityHandle,
+ SENSOR_TYPE_PROXIMITY, sc::kProximityMaxRange, sc::kProximityResolution,
+ sc::kProximityPower, sc::kProximityMinDelay, sc::kFifoReservedEventCount,
+ sc::kFifoMaxEventCount, sc::kProximityStringType, sc::kRequiredPermission,
+ sc::kMaxDelay, flags);
+}
+
+SensorInfo AmbientTempSensor() {
+ uint32_t flags = sc::kAmbientTempReportingMode |
+ (sc::kAmbientTempIsWakeup ? SENSOR_FLAG_WAKE_UP : 0);
+
+ return SensorInfo(sc::kAmbientTempName, sc::kVendor, sc::kVersion,
+ sc::kAmbientTempHandle, SENSOR_TYPE_AMBIENT_TEMPERATURE,
+ sc::kAmbientTempMaxRange, sc::kAmbientTempResolution,
+ sc::kAmbientTempPower, sc::kAmbientTempMinDelay,
+ sc::kFifoReservedEventCount, sc::kFifoMaxEventCount,
+ sc::kAmbientTempStringType, sc::kRequiredPermission,
+ sc::kMaxDelay, flags);
+}
+
+SensorInfo DeviceTempSensor() {
+ uint32_t flags = sc::kDeviceTempReportingMode |
+ (sc::kDeviceTempIsWakeup ? SENSOR_FLAG_WAKE_UP : 0);
+
+ return SensorInfo(sc::kDeviceTempName, sc::kVendor, sc::kVersion,
+ sc::kDeviceTempHandle, SENSOR_TYPE_TEMPERATURE,
+ sc::kDeviceTempMaxRange, sc::kDeviceTempResolution,
+ sc::kDeviceTempPower, sc::kDeviceTempMinDelay,
+ sc::kFifoReservedEventCount, sc::kFifoMaxEventCount,
+ sc::kDeviceTempStringType, sc::kRequiredPermission,
+ sc::kMaxDelay, flags);
+}
+
+SensorInfo RelativeHumiditySensor() {
+ uint32_t flags = sc::kRelativeHumidityReportingMode |
+ (sc::kRelativeHumidityIsWakeup ? SENSOR_FLAG_WAKE_UP : 0);
+
+ return SensorInfo(sc::kRelativeHumidityName, sc::kVendor, sc::kVersion,
+ sc::kRelativeHumidityHandle, SENSOR_TYPE_RELATIVE_HUMIDITY,
+ sc::kRelativeHumidityMaxRange,
+ sc::kRelativeHumidityResolution, sc::kRelativeHumidityPower,
+ sc::kRelativeHumidityMinDelay, sc::kFifoReservedEventCount,
+ sc::kFifoMaxEventCount, sc::kRelativeHumidityStringType,
+ sc::kRequiredPermission, sc::kMaxDelay,
+ flags);
+}
+
+} // namespace avd
diff --git a/guest/hals/sensors/sensors.h b/guest/hals/sensors/sensors.h
new file mode 100644
index 0000000..7b7c402
--- /dev/null
+++ b/guest/hals/sensors/sensors.h
@@ -0,0 +1,234 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+// Google Compute Engine (GCE) Sensors HAL - Sensors HAL State
+#ifndef DEVICE_GOOGLE_GCE_SENSORS_SENSORS_H
+#define DEVICE_GOOGLE_GCE_SENSORS_SENSORS_H
+
+#include <api_level_fixes.h>
+#include "MonotonicTime.h"
+#include "sensors_hal.h"
+
+namespace avd {
+
+// Stores static information about a sensor.
+// Must be completely compatible with sensor_t (i.e. no additional
+// information or virtual functions)
+// so we can cast a list of SensorInfo to a list of sensor_t.
+class SensorInfo : public sensor_t {
+ public:
+ // Dummy, empty set of sensor information (value-initialized).
+ SensorInfo() : sensor_t() {}
+
+ private:
+ SensorInfo(const char* name, const char* vendor, int version, int handle,
+ int type, float max_range, float resolution, float power,
+ int32_t min_delay, uint32_t fifo_reserved_event_count,
+ uint32_t fifo_max_event_count, const char* string_type,
+ const char* required_permission, int32_t max_delay,
+ uint32_t reporting_mode);
+
+ friend SensorInfo AccelerometerSensor();
+ friend SensorInfo GyroscopeSensor();
+ friend SensorInfo LightSensor();
+ friend SensorInfo MagneticFieldSensor();
+ friend SensorInfo PressureSensor();
+ friend SensorInfo ProximitySensor();
+ friend SensorInfo AmbientTempSensor();
+ friend SensorInfo DeviceTempSensor();
+ friend SensorInfo RelativeHumiditySensor();
+};
+
+SensorInfo AccelerometerSensor();
+SensorInfo GyroscopeSensor();
+SensorInfo LightSensor();
+SensorInfo MagneticFieldSensor();
+SensorInfo PressureSensor();
+SensorInfo ProximitySensor();
+SensorInfo AmbientTempSensor();
+SensorInfo DeviceTempSensor();
+SensorInfo RelativeHumiditySensor();
+
+// Stores the current state of a sensor.
+class SensorState {
+ public:
+ SensorState(SensorInfo info);
+ virtual ~SensorState() {}
+
+ // What this sensor is activated or not.
+ bool enabled_;
+ // Buffer of incoming events.
+ sensors_event_t event_;
+ // The deadline at which we should report the next sensor event
+ // to the framework in order to meet our frequency constraints.
+ // For disabled sensors, should be 'infinity'.
+ avd::time::MonotonicTimePoint deadline_;
+ // Delay time between consecutive sensor samples, in ns.
+ avd::time::Nanoseconds sampling_period_;
+
+ // Time 'infinity'.
+ static const avd::time::MonotonicTimePoint kInfinity;
+};
+
+namespace sensors_constants {
+// TODO: Verify these numbers.
+// Vendor of the hardware part.
+const char kVendor[] = "Google";
+// Version of the hardware part + driver. The value of this field
+// must increase when the driver is updated in a way that
+// changes the output of the sensor.
+const int kVersion = GCE_SENSOR_DEVICE_VERSION;
+// Number of events reserved for this sensor in batch mode FIFO.
+// If it has its own FIFO, the size of that FIFO.
+const uint32_t kFifoReservedEventCount = 15;
+// Maximum events that can be batched. In a shared FIFO,
+// the size of that FIFO.
+const uint32_t kFifoMaxEventCount = 15;
+// Permission required to use this sensor, or empty string
+// if none required.
+const char kRequiredPermission[] = "";
+// Defined only for continuous mode and on-change sensors.
+// Delay corresponding with lowest frequency supported.
+const int32_t kMaxDelay = 5000000;
+
+// Name of this sensor. Must be unique.
+const char kAccelerometerName[] = "acceleration";
+const char kGyroscopeName[] = "gyroscope";
+const char kLightName[] = "light";
+const char kMagneticFieldName[] = "magnetic_field";
+const char kPressureName[] = "pressure";
+const char kProximityName[] = "proximity";
+const char kAmbientTempName[] = "ambient_temp";
+const char kDeviceTempName[] = "device_temp";
+const char kRelativeHumidityName[] = "relative_humidity";
+
+// Handle that identifies the sensor. This is used as an array index,
+// so must be unique in the range [0, # sensors)
+
+const int kAccelerometerHandle = 0;
+const int kGyroscopeHandle = 1;
+const int kLightHandle = 2;
+const int kMagneticFieldHandle = 3;
+const int kPressureHandle = 4;
+const int kProximityHandle = 5;
+const int kAmbientTempHandle = 6;
+const int kDeviceTempHandle = 7;
+const int kRelativeHumidityHandle = 8;
+
+// For continuous sensors, minimum sample period (in microseconds).
+// On-Change (0), One-shot (-1), and special (0).
+const int32_t kAccelerometerMinDelay = 4444;
+const int32_t kGyroscopeMinDelay = 4444;
+const int32_t kLightMinDelay = 0;
+const int32_t kMagneticFieldMinDelay = 14285;
+const int32_t kPressureMinDelay = 28571;
+const int32_t kProximityMinDelay = 0;
+const int32_t kAmbientTempMinDelay = 4444;
+const int32_t kDeviceTempMinDelay = 4444;
+const int32_t kRelativeHumidityMinDelay = 4444;
+
+// Maximum range of this sensor's value in SI units.
+const float kAccelerometerMaxRange = 39.226593f;
+const float kGyroscopeMaxRange = 8.726639f;
+const float kLightMaxRange = 10000.0f;
+const float kMagneticFieldMaxRange = 4911.9995f;
+const float kPressureMaxRange = 1100.0f;
+const float kProximityMaxRange = 5.0f;
+const float kAmbientTempMaxRange = 80.0f;
+const float kDeviceTempMaxRange = 80.0f;
+const float kRelativeHumidityMaxRange = 100;
+
+// Smallest difference between two values reported by this sensor.
+const float kAccelerometerResolution = 0.45f;
+const float kGyroscopeResolution = 10.0f;
+const float kLightResolution = 10.0f;
+const float kMagneticFieldResolution = 1.0f;
+const float kPressureResolution = 1.0f;
+const float kProximityResolution = 1.0f;
+const float kAmbientTempResolution = 1.0f;
+const float kDeviceTempResolution = 1.0f;
+const float kRelativeHumidityResolution = 1.0f;
+
+// Rough estimate of this sensor's power consumption in mA.
+const float kAccelerometerPower = 0.45f;
+const float kGyroscopePower = 3.6f;
+const float kLightPower = 0.175f;
+const float kMagneticFieldPower = 5.0f;
+const float kPressurePower = 0.004f;
+const float kProximityPower = 12.675f;
+const float kAmbientTempPower = 1.0f;
+const float kDeviceTempPower = 1.0f;
+const float kRelativeHumidityPower = 1.0f;
+
+// Type of this sensor, represented as a string.
+
+#if GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_2)
+const char kAccelerometerStringType[] = SENSOR_STRING_TYPE_ACCELEROMETER;
+const char kGyroscopeStringType[] = SENSOR_STRING_TYPE_GYROSCOPE;
+const char kLightStringType[] = SENSOR_STRING_TYPE_LIGHT;
+const char kMagneticFieldStringType[] = SENSOR_STRING_TYPE_MAGNETIC_FIELD;
+const char kPressureStringType[] = SENSOR_STRING_TYPE_PRESSURE;
+const char kProximityStringType[] = SENSOR_STRING_TYPE_PROXIMITY;
+const char kAmbientTempStringType[] = SENSOR_STRING_TYPE_AMBIENT_TEMPERATURE;
+const char kDeviceTempStringType[] = SENSOR_STRING_TYPE_TEMPERATURE;
+const char kRelativeHumidityStringType[] = SENSOR_STRING_TYPE_RELATIVE_HUMIDITY;
+#else
+const char kAccelerometerStringType[] = "";
+const char kGyroscopeStringType[] = "";
+const char kLightStringType[] = "";
+const char kMagneticFieldStringType[] = "";
+const char kPressureStringType[] = "";
+const char kProximityStringType[] = "";
+const char kAmbientTempStringType[] = "";
+const char kDeviceTempStringType[] = "";
+const char kRelativeHumidityStringType[] = "";
+#endif
+
+#if GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_3)
+const uint32_t kAccelerometerReportingMode = SENSOR_FLAG_CONTINUOUS_MODE;
+const uint32_t kGyroscopeReportingMode = SENSOR_FLAG_CONTINUOUS_MODE;
+const uint32_t kLightReportingMode = SENSOR_FLAG_ON_CHANGE_MODE;
+const uint32_t kMagneticFieldReportingMode = SENSOR_FLAG_CONTINUOUS_MODE;
+const uint32_t kPressureReportingMode = SENSOR_FLAG_CONTINUOUS_MODE;
+const uint32_t kProximityReportingMode = SENSOR_FLAG_ON_CHANGE_MODE;
+const uint32_t kAmbientTempReportingMode = SENSOR_FLAG_ON_CHANGE_MODE;
+const uint32_t kDeviceTempReportingMode = SENSOR_FLAG_ON_CHANGE_MODE;
+const uint32_t kRelativeHumidityReportingMode = SENSOR_FLAG_ON_CHANGE_MODE;
+#else
+const uint32_t kAccelerometerReportingMode = 0;
+const uint32_t kGyroscopeReportingMode = 0;
+const uint32_t kLightReportingMode = 0;
+const uint32_t kMagneticFieldReportingMode = 0;
+const uint32_t kPressureReportingMode = 0;
+const uint32_t kProximityReportingMode = 0;
+const uint32_t kAmbientTempReportingMode = 0;
+const uint32_t kDeviceTempReportingMode = 0;
+const uint32_t kRelativeHumidityReportingMode = 0;
+#endif
+
+const bool kAccelerometerIsWakeup = false;
+const bool kGyroscopeIsWakeup = false;
+const bool kLightIsWakeup = false;
+const bool kMagneticFieldIsWakeup = false;
+const bool kPressureIsWakeup = false;
+const bool kProximityIsWakeup = true;
+const bool kAmbientTempIsWakeup = false;
+const bool kDeviceTempIsWakeup = false;
+const bool kRelativeHumidityIsWakeup = false;
+
+} // namespace sensors_constants
+} // namespace avd
+
+#endif
diff --git a/guest/hals/sensors/sensors_hal.cpp b/guest/hals/sensors/sensors_hal.cpp
new file mode 100644
index 0000000..e331d9f
--- /dev/null
+++ b/guest/hals/sensors/sensors_hal.cpp
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+// Google Compute Engine (GCE) Sensors HAL - Main File
+#include <api_level_fixes.h>
+
+#include "sensors_hal.h"
+#include "gce_sensors.h"
+
+static hw_module_methods_t hal_module_methods = {
+ GCE_STATIC_INITIALIZER(open) avd::GceSensors::Open,
+};
+
+sensors_module_t HAL_MODULE_INFO_SYM = {
+ GCE_STATIC_INITIALIZER(common) {
+ GCE_STATIC_INITIALIZER(tag) HARDWARE_MODULE_TAG,
+ GCE_STATIC_INITIALIZER(module_api_version) 1,
+ GCE_STATIC_INITIALIZER(hal_api_version) 0,
+ GCE_STATIC_INITIALIZER(id) SENSORS_HARDWARE_MODULE_ID,
+ GCE_STATIC_INITIALIZER(name) "Android-GCE SENSORS Module",
+ GCE_STATIC_INITIALIZER(author) "Google",
+ GCE_STATIC_INITIALIZER(methods) &hal_module_methods,
+ },
+ GCE_STATIC_INITIALIZER(get_sensors_list) avd::GceSensors::GetSensorsList,
+#if GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(1_4)
+ GCE_STATIC_INITIALIZER(set_operation_mode) avd::GceSensors::SetOperationMode,
+#endif
+};
diff --git a/guest/hals/sensors/sensors_hal.h b/guest/hals/sensors/sensors_hal.h
new file mode 100644
index 0000000..c53c403
--- /dev/null
+++ b/guest/hals/sensors/sensors_hal.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+// Google Compute Engine (GCE) Sensors HAL - Main File.
+#ifndef DEVICE_GOOGLE_GCE_SENSORS_SENSORS_HAL_H
+#define DEVICE_GOOGLE_GCE_SENSORS_SENSORS_HAL_H
+
+#include <api_level_fixes.h>
+#include <cutils/log.h>
+
+#if GCE_PLATFORM_SDK_BEFORE(K)
+#define GCE_SENSOR_DEVICE_VERSION HARDWARE_MAKE_API_VERSION(0, 1)
+#elif GCE_PLATFORM_SDK_BEFORE(L)
+#define GCE_SENSOR_DEVICE_VERSION SENSORS_DEVICE_API_VERSION_1_1
+#elif GCE_PLATFORM_SDK_BEFORE(M)
+#define GCE_SENSOR_DEVICE_VERSION SENSORS_DEVICE_API_VERSION_1_3
+#else
+#define GCE_SENSOR_DEVICE_VERSION SENSORS_DEVICE_API_VERSION_1_4
+#endif
+
+#define GCE_SENSORS_DEVICE_API_VERSION_ATLEAST(X) \
+ (defined (SENSORS_DEVICE_API_VERSION_##X) && \
+ (GCE_SENSOR_DEVICE_VERSION >= SENSORS_DEVICE_API_VERSION_##X))
+
+#define SENSORS_DEBUG 0
+
+#if SENSORS_DEBUG
+# define D(...) ALOGD(__VA_ARGS__)
+#else
+# define D(...) ((void)0)
+#endif
+
+#include <hardware/hardware.h>
+#include <hardware/sensors.h>
+
+#endif
