dragonboard: power: Add the PowerHAL skeletonpower-hal-upstream

The following changes provide a power HAL skeleton. The goal of this
skeleton is to evolve in order to provide as much functionalities as
possible in a generic manner.

Despite it is a skeleton, the implementation provides a set of
advanced features we can easily enable.

1. Boost actions basically do nothing. But the timer mechanism is
implemented so any action can automatically disable itself after a
specified duration. As per today the boost actions are not specified
by the platform, thus it is a zero boost duration. The meaning of a
zero boost is no timeout for the boost. Consequently, if the system
does not disable the boost, the system will stay in a higher power
consumption state. For this reason, if no duration is provided, the
power HAL will set a default duration anyway.

2. Mode actions do nothing except setting a zero latency when
receiving the LAUNCH mode notification. That is done basically for
having a default behavior for this mode but it is subject to change.

3. Hint sessions are created but no actions is done when created. This
code is candidate for platform specific optimizations. The run
duration are monitored with an exponential moving average algorithm
computing on the fly the intervals between the tasks. Platform
specific code can take decisions based on this information.

4. A power/performance library is integrated in the power HAL and
hopefully it can continue to evolve in the future as an external
project with more features. Nevertheless, the library provides the API
to set/get the frequency as well as setting the min and max
frequency. The CPU is considered as a device so the API is unified
between CPUs and devices. In addition it allows to act on the device
latencies.

As far as I can tell, with the thermal HAL and the power HAL
implemented for the dragonboard, there is almost enough material to
enable the ADPF. However, given the dragonboard is an EVB platform, it
does not have a skin temperature sensor or a slow moving sensor
identified yet. Thus the thermal headroom can not be computed as it
relies on the skin temperature sensor type.

Change-Id: I8a860992a4a673794a5003486da3deed0f28dd06
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

26 files changed, 2790 insertions, 6 deletions

diff --git a/db845c/BoardConfig.mk b/db845c/BoardConfig.mk
index 1b6b116..e908e72 100644
--- a/db845c/BoardConfig.mk
+++ b/db845c/BoardConfig.mk
@@ -59,3 +59,6 @@ BOARD_SEPOLICY_DIRS += device/linaro/dragonboard/shared/graphics/minigbm_msm/sep
 
 # Thermal
 BOARD_SEPOLICY_DIRS += device/linaro/dragonboard/shared/hal/thermal/sepolicy/
+
+# Power
+BOARD_SEPOLICY_DIRS += device/linaro/dragonboard/shared/hal/power/sepolicy/
diff --git a/db845c/device.mk b/db845c/device.mk
index 122fabf..9c1b98b 100644
--- a/db845c/device.mk
+++ b/db845c/device.mk
@@ -47,6 +47,13 @@ PRODUCT_COPY_FILES += \
     device/linaro/dragonboard/shared/hal/thermal/etc/thermal-db845c.json:$(TARGET_COPY_OUT_VENDOR)/etc/thermal.json
 endif
 
+# Power HAL
+PRODUCT_PACKAGES += \
+    android.hardware.power@1.3-service.linaro-generic
+
+PRODUCT_COPY_FILES += \
+    device/linaro/dragonboard/shared/hal/power/hal/init.db845c.power.rc:$(TARGET_COPY_OUT_VENDOR)/etc/init/init.db845c.power.rc
+
 # Set BT address
 PRODUCT_PACKAGES += bdaddr
 
diff --git a/full.mk b/full.mk
index 69d8a80..0bf764c 100644
--- a/full.mk
+++ b/full.mk
@@ -71,12 +71,6 @@ PRODUCT_COPY_FILES += \
     frameworks/native/data/etc/android.hardware.bluetooth_le.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.bluetooth_le.xml
 
 #
-# Power HAL
-#
-PRODUCT_PACKAGES += \
-    android.hardware.power-service.example
-
-#
 # PowerStats HAL
 #
 PRODUCT_PACKAGES += \
diff --git a/shared/hal/power/hal/Android.bp b/shared/hal/power/hal/Android.bp
new file mode 100644
index 0000000..05755b0
--- /dev/null
+++ b/shared/hal/power/hal/Android.bp
@@ -0,0 +1,81 @@
+//
+// Copyright (C) 2023 Linaro Ltd.
+//
+// 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.
+
+package {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "hardware_interfaces_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+cc_binary {
+    name: "android.hardware.power@1.3-service.linaro-generic",
+    relative_install_path: "hw",
+    vendor: true,
+    init_rc: ["android.hardware.power@1.3-service.linaro-generic.rc"],
+    vintf_fragments: ["android.hardware.power@1.3-service.linaro-generic.xml"],
+    srcs: [
+	"Power.cpp",
+        "PowerHintSession.cpp",
+	"Timer.cpp",
+        "main.cpp"
+    ],
+
+    shared_libs: [
+	"libbase",
+	"libjsoncpp",
+        "libutils",
+	"libbinder_ndk",
+	"libpowperf",
+	"android.hardware.power-V3-ndk",
+    ],
+
+    cflags: ["-fexceptions"],
+
+    strip: {
+        none: true,
+    },
+}
+
+cc_binary {
+    name: "tstPowerHAL",
+    relative_install_path: "hw",
+    vendor: true,
+    srcs: [
+          "tstPowerHAL.cpp",
+    ],
+
+    shared_libs: [
+	"libbase",
+	"libutils",
+	"libbinder_ndk",
+	"libpowperf",
+	"android.hardware.power-V3-ndk",
+     ],
+
+    cflags: ["-fexceptions"],
+}
+
+filegroup {
+    name: "android.hardware.power@1.3-service.linaro-generic.xml",
+    srcs: ["android.hardware.power@1.3-service.linaro-generic.xml"],
+}
+
+filegroup {
+    name: "android.hardware.power@1.3-service.linaro-generic.rc",
+    srcs: ["android.hardware.power@1.3-service.linaro-generic.rc"],
+}
diff --git a/shared/hal/power/hal/Power.cpp b/shared/hal/power/hal/Power.cpp
new file mode 100644
index 0000000..dcac905
--- /dev/null
+++ b/shared/hal/power/hal/Power.cpp
@@ -0,0 +1,575 @@
+/*
+ * Copyright (C) 2023 Linaro Ltd.
+ *
+ * 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.
+ */
+#define LOG_TAG "android.hardware.power@1.3-service.linaro-generic"
+
+#include <android-base/logging.h>
+
+#include <fstream>
+
+#include "Power.h"
+#include "PowerHintSession.h"
+
+#include "libpowperf.h"
+
+namespace aidl::android::hardware::power::impl::linaro {
+
+using namespace std::chrono_literals;
+
+using ndk::ScopedAStatus;
+
+static const std::vector<Boost> BOOST_RANGE{ndk::enum_range<Boost>().begin(),
+                                            ndk::enum_range<Boost>().end()};
+
+static const std::vector<Mode> MODE_RANGE{ndk::enum_range<Mode>().begin(),
+                                          ndk::enum_range<Mode>().end()};
+
+#define DEFAULT_MODE static_cast<Mode>(std::numeric_limits<int32_t>::max())
+#define DEFAULT_BOOST static_cast<Boost>(std::numeric_limits<int32_t>::max())
+
+/*
+  Modes:
+  ======
+
+  DOUBLE_TAP_TO_WAKE : This mode indicates that the device is allowed
+  to wake up when the screen is tapped twice.
+
+  LOW_POWER : This mode indicates whether low power mode is
+  activated. This mode saves power consumption at the expense of
+  performance
+
+  SUSTAINED_PERFORMANCE : Sustained performance mode is designed to
+  provide consistent performance levels over an extended period of
+  time.
+
+  FIXED_PERFORMANCE : Sets the device to a fixed performance level
+  that lasts for at least 10 minutes under normal indoor
+  conditions. The difference between this mode and
+  SUSTAINED_PERFORMANCE mode is that: SUSTAINED_PERFORMANCE sets an
+  upper limit on performance for long-term stability;
+  FIXED_PERFORMANCE mode sets both an upper and lower limit on
+  performance so that any workload running in FIXED_PERFORMANCE mode
+  should perform at a repeatable time Completed within.
+
+  VR : VR mode is designed to provide minimal guarantees of
+  performance for as long as the device can sustain it.
+
+  LAUNCH : This mode indicates that the application has been launched
+
+  EXPENSIVE_RENDERING : This mode indicates that the device is about
+  to enter an expensive rendering cycle.
+
+  INTERACTIVE : This mode indicates that the device is about to
+  enter/leave the interactive state or the non-interactive state. The
+  non-interactive state may be entered after a period of inactivity in
+  order to conserve battery power during such periods of
+  inactivity. Typical actions are to turn the device on or off and
+  adjust the cpufreq parameters. This function can also call the
+  appropriate interface, allowing the kernel to suspend the system
+  into a low-power sleep state when entering a non-interactive state,
+  and disable low-power suspend when the system is in an interactive
+  state. When low-power suspend states are enabled, the kernel can
+  suspend the system without a wakelock being held.
+
+  DEVICE_IDLE : This mode indicates that the device is in an idle
+  state. For detailed information, please refer to: Optimizing for Low
+  Power Mode and Application Standby Mode
+
+  DISPLAY_INACTIVE : This mode means the display is off or still on,
+  but optimized for low power consumption.  The following prompt
+  options are currently not part of the Android framework, but OEMs
+  may choose to implement power/performance optimizations.
+
+  AUDIO_STREAMING_LOW_LATENCY : This mode means low latency audio is
+  active
+
+  CAMERA_STREAMING_SECURE : This mode indicates that camera security
+  streaming is being initiated
+
+  CAMERA_STREAMING_LOW : This mode indicates that camera
+  low-resolution streaming is being started.
+
+  CAMERA_STREAMING_MID : This mode indicates that camera
+  mid-resolution streaming is being started.
+
+  CAMERA_STREAMING_HIGH : This mode indicates that camera
+  high-resolution streaming is being started
+
+
+  Boost:
+  ======
+
+  INTERACTION: This boost is set when the user interacts with the
+  device, for example, a touch screen event is passed in. CPU and GPU
+  load may appear quickly, possibly increasing the speed of the CPU,
+  memory bus, etc. appropriately. Note that this is different from
+  INTERACTIVE mode, which only means that this interaction *may*
+  happen, not that it is actively happening.
+
+  DISPLAY_UPDATE_IMMINENT: This boost indicates that the framework may
+  provide a new display frame soon. This means that the device should
+  ensure that the display processing path is powered on and ready to
+  receive that update.
+
+  ML_ACC: This boost indicates that the device is interacting with the
+  ML accelerator
+
+  AUDIO_LAUNCH: This boost indicates that the device is setting up an
+  audio stream.
+
+  CAMERA_LAUNCH: This boost indicates that the Camera is being
+  launched
+
+  CAMERA_SHOT: This boost indicates that the Camera is shooting
+
+*/
+bool Power::setBoost_Interaction(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setBoost_DisplayUpdateImminent(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setBoost_MlAcc(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setBoost_AudioLaunch(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setBoost_CameraLaunch(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setBoost_CameraShot(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+std::string Power::getUuid(void)
+{
+	std::ifstream ifs("/proc/sys/kernel/random/uuid");
+	std::ostringstream oss;
+
+	if (!ifs.is_open()) {
+		LOG(ERROR) << "Failed to open 'uuid' proc file";
+		return "";
+	}
+
+	oss << ifs.rdbuf();
+
+	return oss.str();
+}
+
+ScopedAStatus Power::setBoost(Boost type, int32_t durationMs)
+{
+	int ret;
+	int duration;
+	BoostAction *boostAction;
+
+	if (mBoostActions.find(type) == mBoostActions.end())
+		return ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+
+	LOG(DEBUG) << "Power::setBoost[" << toString(type) << "]"
+		   << ", duration= " << durationMs;
+
+	boostAction = mBoostActions[type];
+
+	duration = durationMs ? durationMs : boostAction->mDefaultDurationMs;
+
+	/*
+	 * The caller has a knowledge of the duration of the requested
+	 * boost. It gives us a value. With a zero value specified in
+	 * argument, we check if there is a default value set for this
+	 * boost action.
+	 *
+	 * Without a default duration, the boost will stay enabled
+	 * until it is disabled manually, without a
+	 * timeout. Obviously, that is not desirable because if the
+	 * caller forgets to disable the boost, the power consumption
+	 * will be higher until disabled.
+	 *
+	 * For instance, Boost::INTERACTION or
+	 * Boost::DISPLAY_UPDATE_IMMINENT can give a zero duration
+	 * without disabling the boost afterwards. It is up to the
+	 * power HAL to define a default duration value to prevent a
+	 * situation where the system is set with a high power
+	 * consumption boost action and stays in this state.
+	 */
+	if (duration > 0) {
+
+		LOG(DEBUG) << "Set cancelling boost[" << toString(type)
+			   << "] action timer with duration="
+			   << duration;
+
+		if (!boostAction->mTimer->start(duration * NS_PER_MILLISECOND,
+						mCancelBoostAction, boostAction)) {
+			LOG(ERROR) << "Failed to set timer for boost " << toString(type);
+			return ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
+		}
+	}
+
+	/*
+	 * The caller disables the boost. We disable the associated
+	 * timer without taking care if it was previously set. In all
+	 * cases the result will be the same.  If the timer expires
+	 * while we are stopping, the timer 'stop()' function will
+	 * take care of flushing the expiration.
+	 */
+	if (duration < 0) {
+
+		LOG(DEBUG) << "Cancelling boost[" << toString(type) << "]";
+
+		if (!boostAction->mTimer->stop()) {
+			LOG(ERROR) << "Failed to cancel timer for boost["
+				   << toString(type) << "]";
+			return ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
+		}
+	}
+
+	/*
+	 * Call the associated boost action function. If the duration
+	 * is negative, that means we disable the boost, otherwise we
+	 * enable it.
+	 */
+	if (!std::invoke(boostAction->mAction, this, duration < 0 ? false : true)) {
+		LOG(ERROR) << "Boost[" << toString(type) << "] action failed";
+		return ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
+	}
+
+	mCurrentBoost = duration < 0 ? DEFAULT_BOOST : type;
+
+	return ScopedAStatus::ok();
+}
+
+bool Power::setMode_DoubleTapToWake(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_LowPower(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_SustainedPerformance(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_FixedPerformance(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_VR(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_Launch(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	if (powperf_set_global_latency(enabled ? 0 : INT_MAX)) {
+		LOG(ERROR) << "Failed to set global latency";
+		return false;
+	}
+
+	return true;
+}
+
+bool Power::setMode_ExpensiveRendering(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_Interactive(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_DeviceIdle(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_DisplayInactive(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_AudioStreamingLowLatency(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_CameraStreamingSecure(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_CameraStreamingLow(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_CameraStreamingMid(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_CameraStreamingHigh(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_Game(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+bool Power::setMode_GameLoading(bool enabled)
+{
+	LOG(DEBUG) << "Power::" << __func__ << "("
+		   << enabled << ")";
+
+	return true;
+}
+
+ScopedAStatus Power::setMode(Mode type, bool enabled)
+{
+	if (mModeActions.find(type) == mModeActions.end())
+		return ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+
+	LOG(DEBUG) << "Power::setMode[" << toString(type) << "]"
+		   << ", enabled=" << enabled;
+
+	if (!std::invoke(mModeActions[type], this, enabled))
+		return ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+
+	mCurrentMode = enabled ? type : DEFAULT_MODE;
+
+	return ScopedAStatus::ok();
+}
+
+ScopedAStatus Power::isModeSupported(Mode type, bool *_aidl_return)
+{
+	*_aidl_return = type >= MODE_RANGE.front() && type <= MODE_RANGE.back();
+
+	LOG(DEBUG) << "Power::isModeSupported(" << toString(type)
+		   << ")=" << *_aidl_return << std::endl;
+
+	return ScopedAStatus::ok();
+}
+
+ScopedAStatus Power::isBoostSupported(Boost type, bool *_aidl_return)
+{
+	*_aidl_return = type >= BOOST_RANGE.front() && type <= BOOST_RANGE.back();
+
+	LOG(DEBUG) << "Power::isBoostSupported(" << toString(type)
+		   << ")=" << *_aidl_return << std::endl;
+
+	return ScopedAStatus::ok();
+}
+
+ScopedAStatus Power::createHintSession(int32_t tgid, int32_t uid, const std::vector<int32_t>& tids,
+				       int64_t durationNanos, std::shared_ptr<IPowerHintSession> *_aidl_return)
+{
+	if (tids.size() == 0) {
+		LOG(ERROR) << "Empty thread list (empty)";
+		return ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+	}
+
+	std::shared_ptr<PowerHintSession> powerHintSession = ndk::SharedRefBase::make<PowerHintSession>();
+
+	powerHintSession->mUuid = getUuid();
+
+	if (powerHintSession->mUuid.empty()) {
+		LOG(ERROR) << "Failed to generate uuid for Hint Session";
+		return ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+	}
+
+	LOG(DEBUG) << "Created hint session tgid=" << tgid
+		   << ", uid=" << uid << ", duration=" << durationNanos
+		   << ", uuid=" << powerHintSession->mUuid;
+
+	*_aidl_return = powerHintSession;
+
+	return ScopedAStatus::ok();
+}
+
+ScopedAStatus Power::getHintSessionPreferredRate(int64_t* outNanoseconds)
+{
+	/*
+	 * Depending on the current mode or boost, we may want a
+	 * different update rate.
+	 */
+	*outNanoseconds = std::chrono::nanoseconds(100ms).count();
+
+	return ScopedAStatus::ok();
+}
+
+static std::map<std::string, int> PerfCapableDevices;
+
+static int ForEachPerfDevice(const char *device, void *data)
+{
+	Power *power = (Power *)data;
+	int id;
+
+	id = powperf_get_device_id(device);
+	if (id < 0) {
+		LOG(ERROR) << "Failed to get device id";
+		return -1;
+	}
+
+	PerfCapableDevices[device] = id;
+
+	LOG(DEBUG) << "Device '" << device << "' found with id=%" << id;
+
+	return 0;
+}
+
+Power::Power(Looper *looper)
+{
+	if (powperf_init()) {
+		LOG(ERROR) << "Failed to initialize power/performance library";
+		throw("Failed to initialize power/performance library");
+	}
+
+	if (powperf_for_each_device(ForEachPerfDevice, this)) {
+		LOG(ERROR) << "Failed to enumerate performance device";
+		throw("Failed to enumerate performance device");
+	}
+
+	mCancelBoostAction = new CancelBoostAction();
+	if (!mCancelBoostAction) {
+		LOG(ERROR) << "Failed to allocate CancelBoostAction object";
+		throw("Failed to allocate CancelBoostAction object");
+	}
+
+	/*
+	 * As the enums are generated from AIDL, there is no value for
+	 * out of Mode or Boost value. Let's trick the enum by setting
+	 * it to int max
+	 */
+	mCurrentMode = static_cast<Mode>(std::numeric_limits<int32_t>::max());
+	mCurrentBoost = static_cast<Boost>(std::numeric_limits<int32_t>::max());
+
+	/*
+	 * At this point we don't care about freeing the resources,
+	 * the power class is supposed to be a singleton and with a
+	 * life cycle equal to the power service. So if the class is
+	 * destroyed, the process associated with as well as the
+	 * resources are freed
+	 */
+	mBoostActions[Boost::INTERACTION]             = new BoostAction(&Power::setBoost_Interaction, 500, looper, this);
+	mBoostActions[Boost::DISPLAY_UPDATE_IMMINENT] = new BoostAction(&Power::setBoost_DisplayUpdateImminent, 250, looper, this);
+	mBoostActions[Boost::ML_ACC]                  = new BoostAction(&Power::setBoost_MlAcc, 0, looper, this);
+	mBoostActions[Boost::AUDIO_LAUNCH]            = new BoostAction(&Power::setBoost_AudioLaunch, 0, looper, this);
+	mBoostActions[Boost::CAMERA_LAUNCH]           = new BoostAction(&Power::setBoost_CameraLaunch, 0, looper, this);
+	mBoostActions[Boost::CAMERA_SHOT]             = new BoostAction(&Power::setBoost_CameraShot, 0, looper, this);
+
+	mModeActions[Mode::DOUBLE_TAP_TO_WAKE]		= &Power::setMode_DoubleTapToWake;
+	mModeActions[Mode::LOW_POWER]			= &Power::setMode_LowPower;
+	mModeActions[Mode::SUSTAINED_PERFORMANCE]	= &Power::setMode_SustainedPerformance;
+	mModeActions[Mode::FIXED_PERFORMANCE]		= &Power::setMode_FixedPerformance;
+	mModeActions[Mode::VR]				= &Power::setMode_VR;
+	mModeActions[Mode::LAUNCH]			= &Power::setMode_Launch;
+	mModeActions[Mode::EXPENSIVE_RENDERING]		= &Power::setMode_ExpensiveRendering;
+	mModeActions[Mode::INTERACTIVE]			= &Power::setMode_Interactive;
+	mModeActions[Mode::DEVICE_IDLE]			= &Power::setMode_DeviceIdle;
+	mModeActions[Mode::DISPLAY_INACTIVE]		= &Power::setMode_DisplayInactive;
+	mModeActions[Mode::AUDIO_STREAMING_LOW_LATENCY]	= &Power::setMode_AudioStreamingLowLatency;
+	mModeActions[Mode::CAMERA_STREAMING_SECURE]	= &Power::setMode_CameraStreamingSecure;
+	mModeActions[Mode::CAMERA_STREAMING_LOW]	= &Power::setMode_CameraStreamingLow;
+	mModeActions[Mode::CAMERA_STREAMING_MID]	= &Power::setMode_CameraStreamingMid;
+	mModeActions[Mode::CAMERA_STREAMING_HIGH]	= &Power::setMode_CameraStreamingHigh;
+	mModeActions[Mode::GAME]			= &Power::setMode_Game;
+	mModeActions[Mode::GAME_LOADING]		= &Power::setMode_GameLoading;
+}
+
+}  // namespace aidl::android::hardware::power::impl::linaro
diff --git a/shared/hal/power/hal/Power.h b/shared/hal/power/hal/Power.h
new file mode 100644
index 0000000..7bd0e3e
--- /dev/null
+++ b/shared/hal/power/hal/Power.h
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2023 Linaro Ltd.
+ *
+ * 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.
+ */
+#pragma once
+
+#include <aidl/android/hardware/power/BnPower.h>
+#include <map>
+#include <functional>
+
+#include "Timer.h"
+
+namespace aidl::android::hardware::power::impl::linaro {
+
+class Power : public BnPower {
+
+public:
+	ndk::ScopedAStatus setMode(Mode type, bool enabled) override;
+	ndk::ScopedAStatus isModeSupported(Mode type, bool* _aidl_return) override;
+	ndk::ScopedAStatus setBoost(Boost type, int32_t durationMs) override;
+	ndk::ScopedAStatus isBoostSupported(Boost type, bool* _aidl_return) override;
+	ndk::ScopedAStatus createHintSession(int32_t tgid, int32_t uid,
+					     const std::vector<int32_t>& threadIds,
+					     int64_t durationNanos,
+					     std::shared_ptr<IPowerHintSession>* _aidl_return) override;
+	ndk::ScopedAStatus getHintSessionPreferredRate(int64_t* outNanoseconds) override;
+	Power(Looper *looper);
+
+private:
+	class BoostAction {
+	public:
+		BoostAction(bool (Power::*action)(bool), int defaultDurationMs, Looper *looper, Power *power):
+			mAction(action), mDefaultDurationMs(defaultDurationMs), mPower(power)
+		{
+			mTimer = new Timer(looper, false);
+			if (!mTimer)
+				throw("Failed to create timer");
+		};
+
+		Timer *mTimer;
+		bool (Power::*mAction)(bool);
+		int mDefaultDurationMs;
+		Power *mPower;
+	};
+
+	class CancelBoostAction : public TimerCallback {
+	public:
+		virtual int handleTimer(void *data) {
+			BoostAction *boostAction = (typeof(boostAction))data;
+			std::invoke(boostAction->mAction, boostAction->mPower, false);
+			return 1;
+		}
+	};
+
+	bool setMode_DoubleTapToWake(bool enabled);
+	bool setMode_LowPower(bool enabled);
+	bool setMode_SustainedPerformance(bool enabled);
+	bool setMode_FixedPerformance(bool enabled);
+	bool setMode_VR(bool enabled);
+	bool setMode_Launch(bool enabled);
+	bool setMode_ExpensiveRendering(bool enabled);
+	bool setMode_Interactive(bool enabled);
+	bool setMode_DeviceIdle(bool enabled);
+	bool setMode_DisplayInactive(bool enabled);
+	bool setMode_AudioStreamingLowLatency(bool enabled);
+	bool setMode_CameraStreamingSecure(bool enabled);
+	bool setMode_CameraStreamingLow(bool enabled);
+	bool setMode_CameraStreamingMid(bool enabled);
+	bool setMode_CameraStreamingHigh(bool enabled);
+	bool setMode_Game(bool enabled);
+	bool setMode_GameLoading(bool enabled);
+
+	bool setBoost_Interaction(bool enabled);
+	bool setBoost_DisplayUpdateImminent(bool enabled);
+	bool setBoost_MlAcc(bool enabled);
+	bool setBoost_AudioLaunch(bool enabled);
+	bool setBoost_CameraLaunch(bool enabled);
+	bool setBoost_CameraShot(bool enabled);
+
+	std::string getUuid(void);
+
+	std::map<int32_t, std::shared_ptr<IPowerHintSession>> mPowerHintSessions;
+	std::map<Mode, bool(Power::*)(bool)> mModeActions;
+	std::map<Boost, BoostAction *> mBoostActions;
+
+	CancelBoostAction *mCancelBoostAction;
+
+	Mode mCurrentMode;
+	Boost mCurrentBoost;
+};
+
+} // namespace aidl::android::hardware::power::impl::linaro
diff --git a/shared/hal/power/hal/PowerHintSession.cpp b/shared/hal/power/hal/PowerHintSession.cpp
new file mode 100644
index 0000000..409e0f4
--- /dev/null
+++ b/shared/hal/power/hal/PowerHintSession.cpp
@@ -0,0 +1,156 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+#include "PowerHintSession.h"
+
+#include <android-base/logging.h>
+
+namespace aidl::android::hardware::power::impl::linaro {
+
+using ndk::ScopedAStatus;
+
+PowerHintSession::PowerHintSession():
+	mPeriodNsAvg(0), mPeriodNsStddev(0),
+	mPeriodNsLastUpdate(0) {}
+
+ScopedAStatus PowerHintSession::updateTargetWorkDuration(int64_t targetDurationNs)
+{
+	LOG(DEBUG) << __func__ << ": PowerHintSesion uuid=" << mUuid
+		   << "targetDurationNs=" << targetDurationNs;
+
+	return ScopedAStatus::ok();
+}
+
+ScopedAStatus PowerHintSession::reportActualWorkDuration(const std::vector<WorkDuration>& workDuration)
+{
+	LOG(DEBUG) << __func__ << ": PowerHintSesion uuid=" << mUuid;
+
+	if (workDuration.empty()) {
+		LOG(DEBUG) << "Empty work durations reporting";
+		return ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+	}
+
+	LOG(DEBUG) << "Reported working duration:";
+
+	/*
+	 * The workDuration structure gives a couple of information.
+	 *
+	 * - timeStampNanos : when the work duration measurement was done
+	 * - durationNanos : the work duration itself
+	 *
+	 * In order to optimize the power and the performance, we need
+	 * some information we can deduce from the work duration
+	 * reporting:
+	 *
+	 * - Are the work durations periodic ?
+	 *
+	 *  ... <---WD---><--something else--><---WD--><-nothing-> ...
+	 *
+	 * - Are the periods between work durations periodic ?
+	 *
+	 *  ... <-WD-><----nonWD----><---WD---><----nonWD----><--WD--> ...
+	 *
+	 * There is no documentation telling if the timestamp was read
+	 * before or after the measurement of the workload
+	 * duration. That is coming from the client side and we don't
+	 * have control on how it measures the duration and the
+	 * timestamp order. However, dead code reading shows the
+	 * report of the duration is called with systemTime().  We can
+	 * reasonably assume the timestamp is after the workload
+	 * duration measurement.
+	 *
+	 *  <---WD0--->|<-----nonWD0-----><--WD1-->|<--nonWD1--><-WD2->|
+	 *             v                           v                   v
+	 *            ts0                         ts1                 ts2
+	 *
+	 * Information extracted:
+	 *
+	 * 1. Duration of nonWD0 : (ts1 - WD1) - ts0
+	 *                nonWD1 : (ts2 - WD2) - ts1
+	 *
+	 * 2. If the nonWD durations are periodic, then we can safely
+	 *    compute when the next WD will happen and take some
+	 *    performance wise decision to increase the workload
+	 *    reactivity. For instance, wakeup 100ms before the
+	 *    expected next WD and set a cpu/dma zero latency.
+	 *
+	 * Information infered:
+	 *
+	 * 1. Target Work duration vs Work duration average
+	 *
+	 *    Target WD > WDavg --> Increase the performance, decrease the latency
+	 *    Target WD < WDavg --> Increase the latency, decrease the performance
+	 *
+	 */
+	for (int i = 0; i < workDuration.size(); i++) {
+
+		int64_t periodNs;
+
+		LOG(DEBUG) << i << ":\t" << workDuration[i].toString();
+
+		if (!mPeriodNsLastUpdate) {
+			mPeriodNsLastUpdate = workDuration[i].timeStampNanos;
+			continue;
+		}
+
+		periodNs = workDuration[i].timeStampNanos - mPeriodNsLastUpdate;
+		mPeriodNsLastUpdate = workDuration[i].timeStampNanos;
+
+		pushPeriod(periodNs);
+	}
+
+	return ScopedAStatus::ok();
+}
+
+ScopedAStatus PowerHintSession::pause()
+{
+	LOG(DEBUG) << __func__ << ": PowerHintSesion uuid=" << mUuid;
+
+	return ScopedAStatus::ok();
+}
+
+ScopedAStatus PowerHintSession::resume()
+{
+	LOG(DEBUG) << __func__ << ": PowerHintSesion uuid=" << mUuid;
+
+	return ScopedAStatus::ok();
+}
+
+ScopedAStatus PowerHintSession::close()
+{
+	LOG(DEBUG) << __func__ << ": PowerHintSesion uuid=" << mUuid;
+
+	return ScopedAStatus::ok();
+}
+
+void PowerHintSession::pushPeriod(int64_t newValue)
+{
+	const int64_t ema_alpha_val = 64;
+	const int64_t ema_alpha_shift = 7;
+	int64_t diff;
+
+	if (!mPeriodNsAvg) {
+		mPeriodNsAvg = newValue;
+		return;
+	}
+
+	diff = (newValue - mPeriodNsAvg) * ema_alpha_val;
+
+	mPeriodNsAvg = mPeriodNsAvg + (diff >> ema_alpha_shift);
+
+	LOG(DEBUG) << "Period=" << newValue << ", emaPeriod=" << mPeriodNsAvg;
+}
+
+}  // namespace aidl::android::hardware::power::impl::linaro
diff --git a/shared/hal/power/hal/PowerHintSession.h b/shared/hal/power/hal/PowerHintSession.h
new file mode 100644
index 0000000..e14dfdf
--- /dev/null
+++ b/shared/hal/power/hal/PowerHintSession.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+#pragma once
+
+#include <aidl/android/hardware/power/BnPowerHintSession.h>
+#include <aidl/android/hardware/power/WorkDuration.h>
+
+namespace aidl::android::hardware::power::impl::linaro {
+
+class PowerHintSession : public BnPowerHintSession {
+
+public:
+	explicit PowerHintSession();
+	ndk::ScopedAStatus updateTargetWorkDuration(int64_t targetDurationNs) override;
+	ndk::ScopedAStatus reportActualWorkDuration(
+		const std::vector<WorkDuration>& durations) override;
+	ndk::ScopedAStatus pause() override;
+	ndk::ScopedAStatus resume() override;
+	ndk::ScopedAStatus close() override;
+
+	std::string mUuid;
+private:
+	void pushPeriod(int64_t newValue);
+
+	int64_t mPeriodNsAvg;
+	int64_t mPeriodNsStddev;
+	int64_t mPeriodNsLastUpdate;
+
+	int64_t mWorkDurationNsLastUpdate;
+};
+
+}  // namespace aidl::android::hardware::power::impl::linaro
diff --git a/shared/hal/power/hal/Timer.cpp b/shared/hal/power/hal/Timer.cpp
new file mode 100644
index 0000000..b57192f
--- /dev/null
+++ b/shared/hal/power/hal/Timer.cpp
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2023 Linaro Ltd.
+ *
+ * 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.
+ */
+#define LOG_TAG "android.hardware.power@1.3-service.linaro-generic"
+
+#include <sys/poll.h>
+#include <sys/timerfd.h>
+
+#include <iostream>
+
+#include <android-base/logging.h>
+
+#include "Timer.h"
+
+namespace aidl::android::hardware::power::impl::linaro {
+
+int TimerCallback::handleEvent(int fd, __attribute__((unused))int events, void *data)
+{
+	struct itimerspec iti;
+	uint64_t expirations;
+
+	if (read(fd, &expirations, sizeof(expirations)) < 0) {
+                LOG(DEBUG) << "Failed to read timer data";
+                return 0;
+        }
+
+	LOG(DEBUG) << "Handling timer id=" << fd
+		   << ", expirations=" << expirations;
+
+	if (!handleTimer(data)) {
+		mTimer->stop();
+		return 0;
+	}
+
+	return 1;
+}
+
+Timer::Timer(Looper *looper, bool periodic): mPeriodic(periodic), mLooper(looper)
+{
+	mTimerFd = timerfd_create(CLOCK_MONOTONIC, 0);
+	if (mTimerFd < 0)
+                throw("Failed to create timer");
+
+	LOG(DEBUG) << "Created timer id=" << mTimerFd;
+}
+
+bool Timer::start(int64_t durationNs, TimerCallback *timerCallback, void *data)
+{
+	struct timespec ts = {
+		.tv_sec = durationNs / NS_PER_SECOND,
+		.tv_nsec = durationNs % NS_PER_SECOND,
+	};
+
+        struct itimerspec iti = {};
+
+	if (mPeriodic)
+		iti.it_interval = ts;
+
+	iti.it_value = ts;
+
+        if (timerfd_settime(mTimerFd, 0, &iti, NULL) < 0) {
+                LOG(DEBUG) << "Failed to set timer duration";
+                return false;
+        }
+
+        if (!mLooper->addFd(mTimerFd, 0, Looper::EVENT_INPUT,
+			     timerCallback, data)) {
+                LOG(DEBUG) << "Failed to add skin temperature callback to mainloop";
+                return false;
+        }
+
+	timerCallback->mTimer = this;
+
+	LOG(DEBUG) << "Started timer id=" << mTimerFd
+		   << " with duration=" << durationNs << " nsec";
+
+	return true;
+}
+
+bool Timer::stop(void)
+{
+	uint64_t expirations;
+
+	struct itimerspec iti = {
+                .it_interval	= { 0, 0 },
+                .it_value	= { 0, 0 },
+        };
+
+	struct pollfd pfd {
+		.fd = mTimerFd,
+		.events = 0,
+	};
+
+        if (timerfd_settime(mTimerFd, 0, &iti, NULL) < 0) {
+                LOG(DEBUG) << "Failed to stop timer";
+                return false;
+        }
+
+	if (!mLooper->removeFd(mTimerFd)) {
+		LOG(DEBUG) << "Failed to remove file descriptor from looper";
+		return false;
+	}
+
+	/*
+	 * If the timer expired while stopping it, we want the event
+	 * to be consumed from the file descriptor to prevent an
+	 * immediate timeout the next time the timer is started.
+	 */
+	if (poll(&pfd, 1, 0) > 0) {
+
+		LOG(DEBUG) << "Timer expired before stopping it, flushing data";
+
+		if (read(mTimerFd, &expirations, sizeof(expirations)) < 0) {
+			LOG(DEBUG) << "Failed to read timer data";
+			return 0;
+		}
+	}
+
+	LOG(DEBUG) << "Stopped timer id=" << mTimerFd;
+
+	return true;
+}
+
+bool Timer::isRunning(void)
+{
+        struct itimerspec iti = {};
+
+	if (timerfd_gettime(mTimerFd, &iti)) {
+		LOG(DEBUG) << "Failed to get timer time";
+		return false;
+	}
+
+	return (iti.it_value.tv_sec || iti.it_value.tv_sec);
+}
+
+}  // namespace aidl::android::hardware::power::impl::linaro
diff --git a/shared/hal/power/hal/Timer.h b/shared/hal/power/hal/Timer.h
new file mode 100644
index 0000000..a20e65a
--- /dev/null
+++ b/shared/hal/power/hal/Timer.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2023 Linaro Ltd.
+ *
+ * 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.
+ */
+#pragma once
+
+#include <android-base/logging.h>
+#include <utils/Looper.h>
+
+#define NS_PER_SECOND		1000000000LL
+#define NS_PER_MILLISECOND	1000000LL
+#define NS_PER_MICROSECOND	1000LL
+
+using ::android::Looper;
+using ::android::LooperCallback;
+
+namespace aidl::android::hardware::power::impl::linaro {
+
+class TimerCallback;
+
+class Timer {
+private:
+	bool mPeriodic;
+	Looper *mLooper;
+
+protected:
+	int mTimerFd;
+public:
+	Timer(Looper *looper, bool periodic);
+	bool start(int64_t durationNs, TimerCallback *timerCallback, void *data);
+	bool stop();
+	bool isRunning();
+};
+
+class TimerCallback : public LooperCallback {
+public:
+	int handleEvent(int fd, int events, void *data);
+	virtual int handleTimer(void *data) = 0;
+	Timer *mTimer;
+};
+
+} // namespace aidl::android::hardware::power::impl::linaro
diff --git a/shared/hal/power/hal/android.hardware.power@1.3-service.linaro-generic.rc b/shared/hal/power/hal/android.hardware.power@1.3-service.linaro-generic.rc
new file mode 100644
index 0000000..1b8465f
--- /dev/null
+++ b/shared/hal/power/hal/android.hardware.power@1.3-service.linaro-generic.rc
@@ -0,0 +1,8 @@
+service hal_power /vendor/bin/hw/android.hardware.power@1.3-service.linaro-generic
+    interface android.hardware.power@1.0::IPower generic
+    interface android.hardware.power@1.1::IPower generic
+    interface android.hardware.power@1.2::IPower generic
+    interface android.hardware.power@1.3::IPower generic
+    class hal
+    user system
+    group system
diff --git a/shared/hal/power/hal/android.hardware.power@1.3-service.linaro-generic.xml b/shared/hal/power/hal/android.hardware.power@1.3-service.linaro-generic.xml
new file mode 100644
index 0000000..8d25d58
--- /dev/null
+++ b/shared/hal/power/hal/android.hardware.power@1.3-service.linaro-generic.xml
@@ -0,0 +1,8 @@
+<!-- Copyright 2023 Linaro Ltd. -->
+<manifest version="1.0" type="device">
+    <hal format="aidl">
+        <name>android.hardware.power</name>
+        <version>3</version>
+        <fqname>IPower/default</fqname>
+    </hal>
+</manifest>
diff --git a/shared/hal/power/hal/init.db845c.power.rc b/shared/hal/power/hal/init.db845c.power.rc
new file mode 100644
index 0000000..2b9935e
--- /dev/null
+++ b/shared/hal/power/hal/init.db845c.power.rc
@@ -0,0 +1,25 @@
+on init
+    chown system system /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq
+    chown system system /sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq
+    chown system system /sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq
+    chown system system /sys/devices/system/cpu/cpufreq/policy0/scaling_setspeed
+    chown system system /sys/devices/system/cpu/cpufreq/policy0/scaling_available_frequencies
+    chown system system /sys/devices/system/cpu/cpufreq/policy4/scaling_min_freq
+    chown system system /sys/devices/system/cpu/cpufreq/policy4/scaling_max_freq
+    chown system system /sys/devices/system/cpu/cpufreq/policy4/scaling_cur_freq
+    chown system system /sys/devices/system/cpu/cpufreq/policy4/scaling_setspeed
+    chown system system /sys/devices/system/cpu/cpufreq/policy4/scaling_available_frequencies
+
+    chown system system /sys/class/devfreq/5000000.gpu/min_freq
+    chown system system /sys/class/devfreq/5000000.gpu/max_freq
+    chown system system /sys/class/devfreq/5000000.gpu/cur_freq
+    chown system system /sys/class/devfreq/5000000.gpu/target_freq
+    chown system system /sys/class/devfreq/5000000.gpu/available_frequencies
+
+    chown system system /sys/class/devfreq/1d84000.ufshc/min_freq
+    chown system system /sys/class/devfreq/1d84000.ufshc/max_freq
+    chown system system /sys/class/devfreq/1d84000.ufshc/cur_freq
+    chown system system /sys/class/devfreq/1d84000.ufshc/target_freq
+    chown system system /sys/class/devfreq/1d84000.ufshc/available_frequencies
+
+    chown system system /dev/cpu_dma_latency
diff --git a/shared/hal/power/hal/main.cpp b/shared/hal/power/hal/main.cpp
new file mode 100644
index 0000000..181fc9f
--- /dev/null
+++ b/shared/hal/power/hal/main.cpp
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+#include "Power.h"
+
+#include <android-base/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+using aidl::android::hardware::power::impl::linaro::Power;
+
+static int transportCallback(__attribute__((unused)) int fd, __attribute__((unused)) int event,
+                             __attribute__((unused)) void *data)
+{
+	ABinderProcess_handlePolledCommands();
+        return 1;
+}
+
+int main()
+{
+	int fd;
+	Looper *looper;
+
+	looper = new Looper(false);
+	if (!looper)
+		return EXIT_FAILURE;
+
+	std::shared_ptr<Power> power = ndk::SharedRefBase::make<Power>(looper);
+
+	ABinderProcess_setThreadPoolMaxThreadCount(0);
+
+	const std::string instance = std::string() + Power::descriptor + "/default";
+	binder_status_t status = AServiceManager_addService(power->asBinder().get(), instance.c_str());
+
+	CHECK_EQ(status, STATUS_OK);
+
+	ABinderProcess_setupPolling(&fd);
+
+	looper->addFd(fd, 0, Looper::EVENT_INPUT, transportCallback, NULL);
+
+	looper->pollAll(-1);
+
+	return EXIT_FAILURE;  // should not reach
+}
diff --git a/shared/hal/power/hal/tstPowerHAL.cpp b/shared/hal/power/hal/tstPowerHAL.cpp
new file mode 100644
index 0000000..cf79dcf
--- /dev/null
+++ b/shared/hal/power/hal/tstPowerHAL.cpp
@@ -0,0 +1,239 @@
+/*
+ * Copyright (C) 2023 Linaro Ltd.
+ *
+ * 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.
+ */
+#define LOG_TAG "tstPowerlHal"
+
+#include <aidl/android/hardware/power/BnPower.h>
+#include <aidl/android/hardware/power/BnPowerHintSession.h>
+#include <android-base/properties.h>
+#include <android/binder_ibinder.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+#include <android/binder_status.h>
+
+#include <iostream>
+
+#include "Power.h"
+#include "Timer.h"
+
+using ::android::sp;
+using ::android::Looper;
+
+using ::aidl::android::hardware::power::IPower;
+using ::aidl::android::hardware::power::Boost;
+using ::aidl::android::hardware::power::Mode;
+using ::aidl::android::hardware::power::impl::linaro::Power;
+using ::aidl::android::hardware::power::impl::linaro::Timer;
+using ::aidl::android::hardware::power::impl::linaro::TimerCallback;
+
+int testBoostSupported(std::shared_ptr<IPower> power)
+{
+	ndk::ScopedAStatus status;
+	bool supported;
+
+	Boost boosts[] = {
+		Boost::INTERACTION,
+		Boost::DISPLAY_UPDATE_IMMINENT,
+		Boost::ML_ACC,
+		Boost::AUDIO_LAUNCH,
+		Boost::CAMERA_LAUNCH,
+		Boost::CAMERA_SHOT,
+	};
+
+	for (int i = 0; i < sizeof(boosts) / sizeof(boosts[0]); i++) {
+
+		status = power->isBoostSupported(boosts[i], &supported);
+		if (!status.isOk()) {
+			std::cout << "Failed to check if boost is supported" << std::endl;
+			return -1;
+		}
+
+		std::cout << "Boost[" << toString(boosts[i]) << "]";
+
+		if (supported)
+			std::cout << " is supported";
+		else
+			std::cout << " is not supported";
+
+		std::cout << std::endl;
+	}
+
+	return 0;
+}
+
+int testBoost(std::shared_ptr<IPower> power)
+{
+	ndk::ScopedAStatus status;
+	bool supported;
+
+	Boost boosts[] = {
+		Boost::INTERACTION,
+		Boost::DISPLAY_UPDATE_IMMINENT,
+		Boost::ML_ACC,
+		Boost::AUDIO_LAUNCH,
+		Boost::CAMERA_LAUNCH,
+		Boost::CAMERA_SHOT,
+	};
+
+	for (int i = 0; i < sizeof(boosts) / sizeof(boosts[0]); i++) {
+
+		status = power->setBoost(boosts[i], 2000);
+		if (!status.isOk()) {
+			std::cout << "Failed to set boost" << std::endl;
+			return -1;
+		}
+
+		std::cout << "Set Boost[" << toString(boosts[i])
+			  << "] for 2000ms" << std::endl;
+	}
+
+	return 0;
+}
+
+int testModeSupported(std::shared_ptr<IPower> power)
+{
+	ndk::ScopedAStatus status;
+	bool supported;
+
+	Mode modes[] = {
+		Mode::DOUBLE_TAP_TO_WAKE,
+		Mode::LOW_POWER,
+		Mode::SUSTAINED_PERFORMANCE,
+		Mode::FIXED_PERFORMANCE,
+		Mode::VR,
+		Mode::LAUNCH,
+		Mode::EXPENSIVE_RENDERING,
+		Mode::INTERACTIVE,
+		Mode::DEVICE_IDLE,
+		Mode::DISPLAY_INACTIVE,
+		Mode::AUDIO_STREAMING_LOW_LATENCY,
+		Mode::CAMERA_STREAMING_SECURE,
+		Mode::CAMERA_STREAMING_LOW,
+		Mode::CAMERA_STREAMING_MID,
+		Mode::CAMERA_STREAMING_HIGH,
+		Mode::GAME,
+		Mode::GAME_LOADING,
+	};
+
+	for (int i = 0; i < sizeof(modes) / sizeof(modes[0]); i++) {
+
+		status = power->isModeSupported(modes[i], &supported);
+		if (!status.isOk()) {
+			std::cout << "Failed to check if mode is supported" << std::endl;
+			return -1;
+		}
+
+		std::cout << "Mode[" << toString(modes[i]) << "]";
+
+		if (supported)
+			std::cout << " is supported";
+		else
+			std::cout << " is not supported";
+
+		std::cout << std::endl;
+	}
+
+	return 0;
+}
+
+int testMode(std::shared_ptr<IPower> power)
+{
+	ndk::ScopedAStatus status;
+	bool supported;
+
+	Mode modes[] = {
+		Mode::DOUBLE_TAP_TO_WAKE,
+		Mode::LOW_POWER,
+		Mode::SUSTAINED_PERFORMANCE,
+		Mode::FIXED_PERFORMANCE,
+		Mode::VR,
+		Mode::LAUNCH,
+		Mode::EXPENSIVE_RENDERING,
+		Mode::INTERACTIVE,
+		Mode::DEVICE_IDLE,
+		Mode::DISPLAY_INACTIVE,
+		Mode::AUDIO_STREAMING_LOW_LATENCY,
+		Mode::CAMERA_STREAMING_SECURE,
+		Mode::CAMERA_STREAMING_LOW,
+		Mode::CAMERA_STREAMING_MID,
+		Mode::CAMERA_STREAMING_HIGH,
+		Mode::GAME,
+		Mode::GAME_LOADING,
+	};
+
+	for (int i = 0; i < sizeof(modes) / sizeof(modes[0]); i++) {
+
+		status = power->setMode(modes[i], true);
+		if (!status.isOk()) {
+			std::cout << "Failed to set mode " << toString(modes[i])  << std::endl;
+			return -1;
+		}
+
+		std::cout << "Enable Mode[" << toString(modes[i]) << "]" << std::endl;
+
+		sleep(1);
+
+		status = power->setMode(modes[i], false);
+		if (!status.isOk()) {
+			std::cout << "Failed to unset mode " << toString(modes[i])  << std::endl;
+			return -1;
+		}
+
+		std::cout << "Disable Mode[" << toString(modes[i]) << "]" << std::endl;
+	}
+
+	return 0;
+}
+
+int main(int, char *[])
+{
+	std::string service("android.hardware.power.IPower/default");
+	std::shared_ptr<IPower> power;
+	AIBinder* binder;
+
+	binder = AServiceManager_waitForService(service.c_str());
+	if (!binder) {
+		std::cout << "Failed to get service: " << service << std::endl;
+		return 1;
+	}
+
+	power = IPower::fromBinder(ndk::SpAIBinder(binder));
+	if (!power) {
+		std::cout << "Failed to get service from binder" << std::endl;
+		return 1;
+	}
+
+	if (testModeSupported(power)) {
+		std::cout << "Mode supported test failed" << std::endl;
+		return 1;
+	}
+
+	if (testMode(power)) {
+		std::cout << "Mode supported test failed" << std::endl;
+		return 1;
+	}
+
+	if (testBoostSupported(power)) {
+		std::cout << "Boost supported test failed" << std::endl;
+		return 1;
+	}
+
+	if (testBoost(power)) {
+		std::cout << "Boost supported test failed" << std::endl;
+		return 1;
+	}
+
+	return 0;
+}
diff --git a/shared/hal/power/lib/libpowperf/Android.bp b/shared/hal/power/lib/libpowperf/Android.bp
new file mode 100644
index 0000000..ee5a945
--- /dev/null
+++ b/shared/hal/power/lib/libpowperf/Android.bp
@@ -0,0 +1,68 @@
+// Copyright 2021 The Android Open Source Project
+
+package {
+    default_applicable_licenses: ["external_libpowperf_license"],
+}
+
+// Added automatically by a large-scale-change that took the approach of
+// 'apply every license found to every target'. While this makes sure we respect
+// every license restriction, it may not be entirely correct.
+//
+// e.g. GPL in an MIT project might only apply to the contrib/ directory.
+//
+// Please consider splitting the single license below into multiple licenses,
+// taking care not to lose any license_kind information, and overriding the
+// default license using the 'licenses: [...]' property on targets as needed.
+//
+// For unused files, consider creating a 'fileGroup' with "//visibility:private"
+// to attach the license to, and including a comment whether the files may be
+// used in the current project.
+// See: http://go/android-license-faq
+license {
+    name: "external_libpowperf_license",
+    visibility: [":__subpackages__"],
+    license_kinds: [
+        "SPDX-license-identifier-LGPL",
+        "SPDX-license-identifier-LGPL-2.1",
+        "SPDX-license-identifier-LGPL-3.0",
+    ],
+    license_text: [
+        "COPYING.txt",
+    ],
+}
+
+cc_library_headers {
+    name: "libpowperf_headers",
+    export_include_dirs: ["include"],
+}
+
+cc_library_shared {
+    host_supported: true,
+    vendor_available: true,
+    product_available: true,
+
+    target: {
+        linux_bionic: {
+            enabled: true,
+        },
+    },
+
+    name: "libpowperf",
+    srcs: [
+        "src/perf.c",
+    ],
+
+    local_include_dirs: [
+        "include",
+    ],
+
+    export_include_dirs: ["include"],
+
+    cflags: [
+        "-g",
+        "-Wall",
+        "-Werror",
+        "-Wno-sign-compare",
+        "-Wno-unused-parameter",
+    ],
+}
diff --git a/shared/hal/power/lib/libpowperf/COPYING.txt b/shared/hal/power/lib/libpowperf/COPYING.txt
new file mode 100644
index 0000000..ca4f73b
--- /dev/null
+++ b/shared/hal/power/lib/libpowperf/COPYING.txt
@@ -0,0 +1,456 @@
+                  GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 2.1, February 1999
+
+ Copyright (C) 1991, 1999 Free Software Foundation, Inc.
+ 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+[This is the first released version of the Lesser GPL.  It also counts
+ as the successor of the GNU Library Public License, version 2, hence
+ the version number 2.1.]
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+Licenses are intended to guarantee your freedom to share and change
+free software--to make sure the software is free for all its users.
+
+  This license, the Lesser General Public License, applies to some
+specially designated software packages--typically libraries--of the
+Free Software Foundation and other authors who decide to use it.  You
+can use it too, but we suggest you first think carefully about whether
+this license or the ordinary General Public License is the better
+strategy to use in any particular case, based on the explanations below.
+
+  When we speak of free software, we are referring to freedom of use,
+not price.  Our General Public Licenses are designed to make sure that
+you have the freedom to distribute copies of free software (and charge
+for this service if you wish); that you receive source code or can get
+it if you want it; that you can change the software and use pieces of
+it in new free programs; and that you are informed that you can do
+these things.
+
+  To protect your rights, we need to make restrictions that forbid
+distributors to deny you these rights or to ask you to surrender these
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+
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+
+  We protect your rights with a two-step method: (1) we copyright the
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+  Most GNU software, including some libraries, is covered by the
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+  When a program is linked with a library, whether statically or using
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+  13. The Free Software Foundation may publish revised and/or new
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+
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+conditions either of that version or of any later version published by
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+DAMAGES.
diff --git a/shared/hal/power/lib/libpowperf/Makefile b/shared/hal/power/lib/libpowperf/Makefile
new file mode 100644
index 0000000..30b7407
--- /dev/null
+++ b/shared/hal/power/lib/libpowperf/Makefile
@@ -0,0 +1,10 @@
+TOPTARGETS := all clean
+
+SUBDIRS := src tst
+
+$(TOPTARGETS): $(SUBDIRS)
+
+$(SUBDIRS):
+	$(MAKE) -C $@ $(MAKECMDGOALS)
+
+.PHONY: $(TOPTARGETS) $(SUBDIRS)
diff --git a/shared/hal/power/lib/libpowperf/include/libpowperf.h b/shared/hal/power/lib/libpowperf/include/libpowperf.h
new file mode 100644
index 0000000..97c00f4
--- /dev/null
+++ b/shared/hal/power/lib/libpowperf/include/libpowperf.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+/* Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> */
+#ifndef __LIBPOWPERF_H
+#define __LIBPOWPERF_H
+
+#ifndef LIBPOWPERF_API
+#define LIBPOWPERF_API __attribute__((visibility("default")))
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+	int powperf_set_device_min_frequency(int id, int frequency);
+	int powperf_get_device_min_frequency(int id);
+
+	int powperf_set_device_max_frequency(int id, int frequency);
+	int powperf_get_device_max_frequency(int id);
+
+	int powperf_set_device_frequency(int id, int frequency);
+	int powperf_get_device_frequency(int id);
+
+	int powperf_set_global_latency(int latency_us);
+	int powperf_get_global_latency(void);
+
+	int powperf_set_device_latency(int id, int latency_us);
+	int powperf_get_device_latency(int id);
+	int powperf_device_latency_supported(int id);
+
+	int powperf_get_device_id(const char *device);
+
+	int powperf_for_each_frequency(int id, int (*cb)(int frequency, void *data),
+				       void *data);
+
+	int powperf_for_each_device(int (*cb)(const char *device,
+					      void *data), void *data);
+
+	int powperf_init(void);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LIBPOWPERF_H */
diff --git a/shared/hal/power/lib/libpowperf/src/Makefile b/shared/hal/power/lib/libpowperf/src/Makefile
new file mode 100644
index 0000000..135bf3d
--- /dev/null
+++ b/shared/hal/power/lib/libpowperf/src/Makefile
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: LGPL-2.1+
+CC=gcc
+CFLAGS+=-g -Wall -Wno-unused -I../include -fPIC -Wextra -O2
+LDFLAGS=-shared
+DEPS = include/libpowperf.h
+OBJS = perf.o
+LIB=libpowperf.so
+
+BINS=$(C_BINS:.c=)
+
+default: libpowperf.so
+
+%.o: %.c $(DEPS)
+	$(CROSS_COMPILE)$(CC) -c -o $@ $< $(CFLAGS)
+
+$(LIB): $(OBJS)
+	$(CROSS_COMPILE)$(CC) $(CFLAGS) $(OBJS) -o $@ $(LDFLAGS)
+
+clean:
+	rm -f $(OBJS) $(LIB) *~
diff --git a/shared/hal/power/lib/libpowperf/src/perf.c b/shared/hal/power/lib/libpowperf/src/perf.c
new file mode 100644
index 0000000..3acdf72
--- /dev/null
+++ b/shared/hal/power/lib/libpowperf/src/perf.c
@@ -0,0 +1,417 @@
+// SPDX-License-Identifier: LGPL-2.1+
+// Copyright (C) 2023, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
+#define _GNU_SOURCE
+#include <dirent.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/sysinfo.h>
+#include <fcntl.h>
+#include <limits.h>
+
+#include "libpowperf.h"
+
+#define SYS_CLASS_DEVFREQ		"/sys/class/devfreq"
+#define SYS_DEVICE_SYSTEM_CPU		"/sys/devices/system/cpu"
+#define SYS_DEVICE_POWER_LATENCY_US	"power/pm_qos_resume_latency_us"
+
+#define CPU_MIN_FREQ			"cpufreq/scaling_min_freq"
+#define CPU_MAX_FREQ			"cpufreq/scaling_max_freq"
+#define CPU_CUR_FREQ			"cpufreq/scaling_cur_freq"
+#define CPU_SET_FREQ			"cpufreq/scaling_setspeed"
+#define CPU_FREQUENCIES			"cpufreq/scaling_available_frequencies"
+
+#define DEV_MIN_FREQ			"min_freq"
+#define DEV_MAX_FREQ			"max_freq"
+#define DEV_CUR_FREQ			"cur_freq"
+#define DEV_SET_FREQ			"target_freq"
+#define DEV_FREQUENCIES			"available_frequencies"
+
+#define MAX_FREQUENCIES			30
+
+#define CPU_DMA_LATENCY_DEV		"/dev/cpu_dma_latency"
+
+static int cpu_dma_latency_fd = -1;
+
+/*
+ * The opening of a file is the most costly operation with files. So
+ * instead of open / read / close, let's open the file descriptor and
+ * keep it opened during all the life time of the library. However, we
+ * don't want those fd to be leaked in child processes application, so
+ * we should the close-on-exec flag.
+ */
+typedef enum {
+	LATENCY,
+	MIN_FREQ,
+	MAX_FREQ,
+	CUR_FREQ,
+	SET_FREQ,
+	MAX_ATTRS,
+} perf_type_t;
+
+#define HZ_UNIT	1
+#define KHZ_UNIT 1000
+#define MHZ_UNIT (KHZ_UNIT * 1000)
+#define GHZ_UNIT (MHZ_UNIT * 1000)
+
+#define KHZ_TO_MHZ(__value) (__value / 1000)
+#define MHZ_TO_KHZ(__value) (__value * 1000)
+#define HZ_TO_MHZ(__value) (KHZ_TO_MHZ(__value) / 1000)
+
+struct dev_sysfs_perf {
+	char device[PATH_MAX];
+	int fds[MAX_ATTRS];
+	int frequencies[MAX_FREQUENCIES];
+	int nr_frequency;
+};
+
+struct attrs {
+	const char *attr;
+	mode_t mode;
+};
+
+static struct dev_sysfs_perf *dev_sysfs_perfs;
+static int count = 0;
+
+static int set_device_perf(int id, perf_type_t perf_type, int value)
+{
+	int len = 128;
+	char value_str[len];
+
+	len = snprintf(value_str, len - 1, "%d\n", value);
+	if (len < 0)
+		return -1;
+
+	if (pwrite(dev_sysfs_perfs[id].fds[perf_type], value_str, len, 0) < 0)
+		return -1;
+
+	return 0;
+}
+
+static int get_device_perf(int id, perf_type_t perf_type)
+{
+	int len = 128;
+	char value_str[len];
+
+	if (pread(dev_sysfs_perfs[id].fds[perf_type], value_str, len, 0) < 0)
+		return -1;
+
+	return atoi(value_str);
+}
+
+static int is_device_perf_supported(int id, perf_type_t perf_type)
+{
+	return (dev_sysfs_perfs[id].fds[perf_type] != -1);
+}
+
+int powperf_set_device_latency(int id, int latency_us)
+{
+	return set_device_perf(id, LATENCY, latency_us);
+}
+
+int powperf_get_device_latency(int id)
+{
+	return get_device_perf(id, LATENCY);
+}
+
+int powperf_device_latency_supported(int id)
+{
+	return is_device_perf_supported(id, LATENCY);
+}
+
+int powperf_set_device_min_frequency(int id, int frequency)
+{
+	return set_device_perf(id, MIN_FREQ, frequency);
+}
+
+int powperf_get_device_min_frequency(int id)
+{
+	return get_device_perf(id, MIN_FREQ);
+}
+
+int powperf_set_device_max_frequency(int id, int frequency)
+{
+	return set_device_perf(id, MAX_FREQ, frequency);
+}
+
+int powperf_get_device_max_frequency(int id)
+{
+	return get_device_perf(id, MAX_FREQ);
+}
+
+int powperf_set_device_frequency(int id, int frequency)
+{
+	return set_device_perf(id, SET_FREQ, frequency);
+}
+
+int powperf_get_device_frequency(int id)
+{
+	return get_device_perf(id, CUR_FREQ);
+}
+
+int powperf_set_global_latency(int latency_us)
+{
+	int ret;
+
+	if (latency_us == INT_MAX) {
+		close(cpu_dma_latency_fd);
+		cpu_dma_latency_fd = -1;
+		return 0;
+	}
+
+	if (cpu_dma_latency_fd == -1) {
+		cpu_dma_latency_fd = open(CPU_DMA_LATENCY_DEV, O_CLOEXEC | O_RDWR);
+		if (cpu_dma_latency_fd < 0)
+			return -1;
+	}
+
+	ret = pwrite(cpu_dma_latency_fd, &latency_us, sizeof(latency_us), 0);
+	if (ret < 0) {
+		close(cpu_dma_latency_fd);
+		cpu_dma_latency_fd = -1;
+	}
+
+	return 0;
+}
+
+int powperf_get_global_latency(void)
+{
+	int latency_us;
+	int ret;
+
+	if (cpu_dma_latency_fd == -1)
+		return INT_MAX;
+
+	ret = pread(cpu_dma_latency_fd, &latency_us, sizeof(latency_us), 0);
+	if (ret < 0)
+		return ret;
+
+	return latency_us;
+}
+
+int powperf_get_device_id(const char *device)
+{
+	int i;
+
+	for (i = 0; i < count; i++) {
+		if (!strcmp(device, dev_sysfs_perfs[i].device))
+			return i;
+	}
+
+	return -1;
+}
+
+int powperf_for_each_device(int (*cb)(const char *device, void *data), void *data)
+{
+	int i;
+
+	for (i = 0; i < count; i++) {
+		if (cb(dev_sysfs_perfs[i].device, data) < 0)
+			return -1;
+	}
+
+	return 0;
+}
+
+int powperf_for_each_frequency(int id, int (*cb)(int frequency, void *data), void *data)
+{
+	int i;
+
+	for (i = 0; i < dev_sysfs_perfs[id].nr_frequency; i++)
+		if (cb(dev_sysfs_perfs[id].frequencies[i], data) < 0)
+			return -1;
+
+	return 0;
+}
+
+static int __dev_sysfs_get_frequencies(int dirfd, struct dev_sysfs_perf *perf,
+				       const char *frequencies)
+{
+	/*
+	 * The maximum sysfs file size is a page size. Even if the
+	 * content would be largely under this value, we stick to the
+	 * sysfs standard.
+	 */
+	size_t size = getpagesize();
+	char buffer[size];
+	char *saveptr, *token;
+	FILE *f;
+	int fd, ret = -1;
+
+	perf->nr_frequency = 0;
+
+	/*
+	 * Retrieve the list of the available frequencies
+	 */
+	fd = openat(dirfd, frequencies, O_RDONLY);
+	if (fd < 0)
+		return -1;
+
+	f = fdopen(fd, "r");
+	if (!f)
+		goto out;
+
+	if (!fgets(buffer, size, f))
+		goto out;
+
+	token = strtok_r(buffer, " ", &saveptr);
+	while (token) {
+		perf->frequencies[perf->nr_frequency] = atoi(token);
+		perf->nr_frequency++;
+		token = strtok_r(NULL, " \n", &saveptr);
+	}
+
+	ret = 0;
+out:
+	fclose(f);
+	close(fd);
+
+	return ret;
+}
+
+static int __dev_sysfs_perf_init(int dirfd,
+				 struct dev_sysfs_perf *perf,
+				 struct attrs attrs[],
+				 const char *frequencies)
+{
+	int i;
+
+	for (i = 0; i < MAX_ATTRS; i++) {
+
+		perf->fds[i] = -1;
+
+		if (attrs[i].attr[0] == '\0')
+			continue;
+
+		perf->fds[i] = openat(dirfd, attrs[i].attr,
+				      attrs[i].mode | O_CLOEXEC);
+
+		/*
+		 * We don't check if the file was correctly opened or
+		 * not. There may be some permissions preventing us to
+		 * access those files. For instance on Android,
+		 * setting the current frequency is a file belonging
+		 * to 'root' for writing but the services are uid
+		 * 'system'.
+		 *
+		 * The usage of the different API will fail giving us
+		 * the indication the feature is not accessible.
+		 */
+	}
+
+	return __dev_sysfs_get_frequencies(dirfd, perf, frequencies);
+}
+
+static int devfreq_sysfs_perf_init(void)
+{
+	DIR *dir;
+	int dirfd;
+	struct dirent *dirent;
+
+	struct attrs attrs[] = {
+		[LATENCY]  = { "", 0 },
+		[MIN_FREQ] = { DEV_MIN_FREQ, O_RDWR },
+		[MAX_FREQ] = { DEV_MAX_FREQ, O_RDWR },
+		[CUR_FREQ] = { DEV_CUR_FREQ, O_RDONLY },
+		[SET_FREQ] = { "", 0 }
+	};
+
+	char path[PATH_MAX];
+
+	dir = opendir(SYS_CLASS_DEVFREQ);
+	if (!dir)
+		return -1;
+
+	while ((dirent = readdir(dir))) {
+
+		if (dirent->d_name[0] == '.')
+			continue;
+
+		dev_sysfs_perfs = realloc(dev_sysfs_perfs,
+					  sizeof(*dev_sysfs_perfs) * (count + 1));
+		if (!dev_sysfs_perfs)
+			return -1;
+
+		sprintf(dev_sysfs_perfs[count].device, "%s", dirent->d_name);
+		sprintf(path, "%s/%s", SYS_CLASS_DEVFREQ, dirent->d_name);
+
+		dirfd = open(path, O_DIRECTORY | O_CLOEXEC);
+		if (dirfd < 0)
+			return -1;
+
+		if (__dev_sysfs_perf_init(dirfd, &dev_sysfs_perfs[count],
+					  attrs, DEV_FREQUENCIES))
+			return -1;
+
+		close(dirfd);
+
+		count++;
+	}
+
+	closedir(dir);
+
+	return 0;
+}
+
+static int cpu_sysfs_perf_init(void)
+{
+	struct attrs attrs[] = {
+		[LATENCY]  = { SYS_DEVICE_POWER_LATENCY_US, O_RDWR },
+		[MIN_FREQ] = { CPU_MIN_FREQ, O_RDWR },
+		[MAX_FREQ] = { CPU_MAX_FREQ, O_RDWR },
+		[CUR_FREQ] = { CPU_CUR_FREQ, O_RDONLY },
+		[SET_FREQ] = { CPU_SET_FREQ, O_WRONLY }
+	};
+
+	char *path;
+
+	int i, nr_cpus, dirfd;
+
+	nr_cpus = get_nprocs_conf();
+	if (nr_cpus < 0)
+		return -1;
+
+	dev_sysfs_perfs = malloc(sizeof(*dev_sysfs_perfs) * nr_cpus);
+	if (!dev_sysfs_perfs)
+		return -1;
+
+	for (i = 0; i < nr_cpus; i++) {
+
+		sprintf(dev_sysfs_perfs[i].device, "cpu%d", i);
+
+		if (asprintf(&path, "%s/%s", SYS_DEVICE_SYSTEM_CPU,
+			     dev_sysfs_perfs[i].device) < 0)
+			return -1;
+
+		dirfd = open(path, O_DIRECTORY | O_CLOEXEC);
+
+		free(path);
+
+		if (dirfd < 0)
+			return -1;
+
+		if (__dev_sysfs_perf_init(dirfd, &dev_sysfs_perfs[i],
+					  attrs, CPU_FREQUENCIES))
+			return -1;
+
+		close(dirfd);
+	}
+
+	count = nr_cpus;
+
+	return 0;
+}
+
+int powperf_init(void)
+{
+	if (cpu_sysfs_perf_init())
+		return -1;
+
+	if (devfreq_sysfs_perf_init())
+		return -1;
+
+	return 0;
+}
diff --git a/shared/hal/power/lib/libpowperf/tst/Makefile b/shared/hal/power/lib/libpowperf/tst/Makefile
new file mode 100644
index 0000000..8e29db7
--- /dev/null
+++ b/shared/hal/power/lib/libpowperf/tst/Makefile
@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: LGPL-2.1+
+CC=gcc
+DEPS = ../include/libpowperf.h
+LIB=../src/libpowperf.so
+C_BINS=tst_powperf.c
+CFLAGS=-g -Wall -Wno-unused
+
+BINS=$(C_BINS:.c=)
+
+tests: $(LIB) $(BINS)
+
+$(BINS): $(C_BINS)
+	$(CROSS_COMPILE)$(CC) $(CFLAGS) $< -o $@ -lpowperf -L../src -Wl,-rpath=../src -I../include
+
+clean:
+	rm -f $(BINS) *~
diff --git a/shared/hal/power/lib/libpowperf/tst/tst_powperf.c b/shared/hal/power/lib/libpowperf/tst/tst_powperf.c
new file mode 100644
index 0000000..760c764
--- /dev/null
+++ b/shared/hal/power/lib/libpowperf/tst/tst_powperf.c
@@ -0,0 +1,237 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <sys/stat.h>
+#include <sys/sysinfo.h>
+#include <sys/types.h>
+
+#include "libpowperf.h"
+
+static int tst_global_latency(void)
+{
+	const int global_latency = 1000;
+	int value;
+
+	if (powperf_set_global_latency(global_latency) < 0) {
+		fprintf(stderr, "Failed to set the global latency\n");
+		return -1;
+	}
+
+	value = powperf_get_global_latency();
+	if (value != global_latency) {
+		fprintf(stderr, "global latency mismatch %d<>%d\n", value, global_latency);
+		return -1;
+	}
+
+	if (powperf_set_global_latency(INT_MAX) < 0) {
+		fprintf(stderr, "Failed to reset the global latency\n");
+		return -1;
+	}
+
+	value = powperf_get_global_latency();
+	if (value != INT_MAX) {
+		fprintf(stderr, "global latency mismatch %d<>%d\n", value, INT_MAX);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int tst_device_latency_cb(const char *device, void *data)
+{
+	const int latency = 500;
+	int id, value, prev_value;
+
+	id = powperf_get_device_id(device);
+	if (id < 0) {
+		fprintf(stderr, "Failed to get device '%s' id\n", device);
+		return -1;
+	}
+
+	if (!powperf_device_latency_supported(id))
+		return 0;
+
+	prev_value = powperf_get_device_latency(id);
+	if (prev_value < 0) {
+		fprintf(stderr, "Failed to get previous latency value\n");
+		return -1;
+	}
+
+	if (powperf_set_device_latency(id, latency)) {
+		fprintf(stderr, "Failed to set latency\n");
+		return -1;
+	}
+
+	value = powperf_get_device_latency(id);
+	if (value < 0) {
+		fprintf(stderr, "Failed to get current latency value\n");
+		return -1;
+	}
+
+	if (value != latency) {
+		fprintf(stderr, "Current and set value mismatch\n");
+		return -1;
+	}
+
+	if (powperf_set_device_latency(id, prev_value)) {
+		fprintf(stderr, "Failed to set latency to previous value\n");
+		return -1;
+	}
+
+	value = powperf_get_device_latency(id);
+	if (value < 0) {
+		fprintf(stderr, "Failed to get current latency value\n");
+		return -1;
+	}
+
+	if (value != prev_value) {
+		fprintf(stderr, "Failed to restore previous value\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static int tst_device_latency(void)
+{
+	return powperf_for_each_device(tst_device_latency_cb, NULL);
+}
+
+struct freq_cb_data {
+	int nr_freq;
+	int *freq;
+};
+
+static int tst_device_frequency_fill_cb(int frequency, void *data)
+{
+	struct freq_cb_data *fcd = (typeof(fcd))data;
+
+	fcd->freq[fcd->nr_freq] = frequency;
+	fcd->nr_freq++;
+
+	return 0;
+}
+
+static int tst_device_frequency_cb(const char *device, void *data)
+{
+	struct freq_cb_data fcd = { 0 };
+	int freq[64];
+	int id, i;
+	int value;
+
+	fcd.freq = freq;
+
+	id = powperf_get_device_id(device);
+	if (id < 0) {
+		fprintf(stderr, "Failed to get device '%s' id\n", device);
+		return -1;
+	}
+
+	if (powperf_for_each_frequency(id, tst_device_frequency_fill_cb, (void *)&fcd)) {
+		fprintf(stderr, "Failed to read frequency for device=%s id=%d\n", device, id);
+		return -1;
+	}
+
+	/*
+	 * For testing the range, we must set the maximum frequency
+	 * interval first.
+	 */
+	if (powperf_set_device_min_frequency(id, fcd.freq[0]) < 0) {
+		fprintf(stderr, "Failed to set initial minimum frequency for device=%s\n", device);
+		return -1;
+	}
+
+	if (powperf_set_device_max_frequency(id, fcd.freq[fcd.nr_freq - 1]) < 0) {
+		fprintf(stderr, "Failed to set initial maximum frequency for device=%s\n", device);
+		return -1;
+	}
+
+	for (i = 0; i < fcd.nr_freq; i++) {
+		if (powperf_set_device_min_frequency(id, fcd.freq[i])) {
+			fprintf(stderr, "Failed to set minimum frequency for device=%s\n", device);
+			return -1;
+		}
+
+		/*
+		 * When setting the minimum/maxiumu frequency, there
+		 * can be delay before being taken into account and
+		 * reflected in sysfs.
+		 */
+		usleep(1000);
+
+		value = powperf_get_device_min_frequency(id);
+		if (value != fcd.freq[i]) {
+			fprintf(stderr, "Minimum frequency mismatch for device=%s %d <> %d\n",
+				device, value, fcd.freq[i]);
+			return -1;
+		}
+	}
+
+	if (powperf_set_device_min_frequency(id, fcd.freq[0]) < 0) {
+		fprintf(stderr, "Failed to set back minimum frequency for device=%s\n", device);
+		return -1;
+	}
+
+	usleep(1000);
+
+	if (powperf_get_device_min_frequency(id) != fcd.freq[0]) {
+		fprintf(stderr, "Unexpected minimum frequency for device=%s\n", device);
+		return -1;
+	}
+
+	for (i = fcd.nr_freq - 1; i >= 0; i--) {
+		if (powperf_set_device_max_frequency(id, fcd.freq[i])) {
+			fprintf(stderr, "Failed to set maximum frequency for device=%s\n", device);
+			return -1;
+		}
+
+		/*
+		 * When setting the minimum/maxiumu frequency, there
+		 * can be delay before being taken into account and
+		 * reflected in sysfs.
+		 */
+		usleep(1000);
+
+		if (powperf_get_device_max_frequency(id) != fcd.freq[i]) {
+			fprintf(stderr, "Maximum frequency mismatch for device=%s\n", device);
+			return -1;
+		}
+	}
+
+	if (powperf_set_device_max_frequency(id, fcd.freq[fcd.nr_freq - 1]) < 0) {
+		fprintf(stderr, "Failed to set back maximum frequency for device=%s\n", device);
+		return -1;
+	}
+
+	usleep(1000);
+
+	if (powperf_get_device_max_frequency(id) != fcd.freq[fcd.nr_freq - 1]) {
+		fprintf(stderr, "Unexpected maximum frequency for device=%s\n", device);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int tst_device_frequency(void)
+{
+	return powperf_for_each_device(tst_device_frequency_cb, NULL);
+}
+
+int main(void)
+{
+	if (powperf_init()) {
+		fprintf(stderr, "Failed to initialize the library\n");
+		return -1;
+	}
+
+	printf("Global latency test: %s\n", tst_global_latency() ? "[Failed]" : "[OK]");
+	printf("Device latency test: %s\n", tst_device_latency() ? "[Failed]" : "[OK]");
+	printf("Device frequency test: %s\n", tst_device_frequency() ? "[Failed]" : "[OK]");
+
+	return 0;
+}
diff --git a/shared/hal/power/sepolicy/file.te b/shared/hal/power/sepolicy/file.te
new file mode 100644
index 0000000..702780a
--- /dev/null
+++ b/shared/hal/power/sepolicy/file.te
@@ -0,0 +1 @@
+type latency_device, dev_type;
diff --git a/shared/hal/power/sepolicy/file_contexts b/shared/hal/power/sepolicy/file_contexts
new file mode 100644
index 0000000..53680bc
--- /dev/null
+++ b/shared/hal/power/sepolicy/file_contexts
@@ -0,0 +1,2 @@
+/dev/cpu_dma_latency                   u:object_r:latency_device:s0
+/vendor/bin/hw/android\.hardware\.power@1\.3-service\.linaro-generic                   u:object_r:hal_power_linaro_exec:s0
diff --git a/shared/hal/power/sepolicy/hal_power_linaro.te b/shared/hal/power/sepolicy/hal_power_linaro.te
new file mode 100644
index 0000000..f86d48c
--- /dev/null
+++ b/shared/hal/power/sepolicy/hal_power_linaro.te
@@ -0,0 +1,13 @@
+type hal_power_linaro, domain;
+hal_server_domain(hal_power_linaro, hal_power)
+
+type hal_power_linaro_exec, exec_type, vendor_file_type, file_type;
+init_daemon_domain(hal_power_linaro)
+
+# Access sysfs files
+allow hal_power_linaro sysfs_devices_system_cpu:file rw_file_perms;
+allow hal_power_linaro sysfs:file rw_file_perms;
+allow hal_power_linaro sysfs:dir r_dir_perms;
+
+# Access dev cpu_dma_latency file
+allow hal_power_linaro latency_device:chr_file rw_file_perms;