power-generic: Add hal-backend-power-generic hal backendsubmit/tizen/20220302.061218accepted/tizen/unified/20220302.131822

Change-Id: I80578a371af061bd125102a814094f6dafaf4bf5
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

8 files changed, 1250 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..c503869
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,32 @@
+CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
+PROJECT(hal-backend-power-generic C)
+
+SET(LIBRARY_NAME "hal-backend-power")
+SET(CMAKE_VERBOSE_MAKEFILE ON)
+SET(PREFIX ${CMAKE_INSTALL_PREFIX})
+SET(HAL_LIBDIR ${CMAKE_HAL_LIBDIR_PREFIX})
+SET(HAL_LICENSEDIR ${CMAKE_HAL_LICENSEDIR_PREFIX})
+
+INCLUDE(FindPkgConfig)
+pkg_check_modules(pkgs REQUIRED
+	hal-api-common
+	hal-api-power
+)
+
+FOREACH(flag ${pkgs_CFLAGS})
+         SET(EXTRA_CFLAGS "${EXTRA_CFLAGS} ${flag}")
+ENDFOREACH(flag)
+SET(CMAKE_C_FLAGS "${CMAKE_CFLAGS} ${EXTRA_CFLAGS}")
+
+INCLUDE_DIRECTORIES(${PROJECT_SOURCE_DIR}/include)
+
+SET(SRCS
+	${PROJECT_SOURCE_DIR}/src/${LIBRARY_NAME}.c
+	${PROJECT_SOURCE_DIR}/src/sysfs.c)
+
+ADD_LIBRARY(${LIBRARY_NAME} SHARED ${SRCS})
+TARGET_LINK_LIBRARIES(${LIBRARY_NAME} ${pkgs_LDFLAGS} -ldl)
+
+INSTALL(FILES ${CMAKE_CURRENT_SOURCE_DIR}/scripts/pass-hal.conf DESTINATION /hal/lib/tmpfiles.d)
+INSTALL(FILES ${CMAKE_CURRENT_SOURCE_DIR}/LICENSE DESTINATION ${HAL_LICENSEDIR}/${PROJECT_NAME})
+INSTALL(TARGETS ${LIBRARY_NAME} DESTINATION ${HAL_LIBDIR} COMPONENT RuntimeLibraries)
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..247c97d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,203 @@
+Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd. All rights reserved.
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   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.
diff --git a/packaging/hal-backend-power-generic.manifest b/packaging/hal-backend-power-generic.manifest
new file mode 100644
index 0000000..75b0fa5
--- /dev/null
+++ b/packaging/hal-backend-power-generic.manifest
@@ -0,0 +1,5 @@
+<manifest>
+    <request>
+        <domain name="_"/>
+    </request>
+</manifest>
diff --git a/packaging/hal-backend-power-generic.spec b/packaging/hal-backend-power-generic.spec
new file mode 100644
index 0000000..8dba3cf
--- /dev/null
+++ b/packaging/hal-backend-power-generic.spec
@@ -0,0 +1,58 @@
+%define version 1.1.0
+%define release 1
+
+Name:       hal-backend-power-generic 
+Summary:    Power HAL for standard linux interface
+Version:    %{version}
+Release:    %{release}
+Group:      System/Hardware Adaptation
+License:    Apache-2.0
+Source0:    %{name}-%{version}.tar.gz
+Source1:    %{name}.manifest
+
+Requires(post): /sbin/ldconfig
+Requires(post): /bin/systemctl
+Requires(post): security-config
+Requires(postun): /sbin/ldconfig
+Requires(postun): /bin/systemctl
+BuildRequires:  cmake
+BuildRequires:  pkgconfig(hal-api-common)
+BuildRequires:  pkgconfig(hal-api-power)
+
+%description
+PASS standard hal
+
+%prep
+%setup -q
+cp %{SOURCE1} .
+
+%build
+%cmake . -DCMAKE_INSTALL_PREFIX=%{_prefix} \
+	-DCMAKE_HAL_LIBDIR_PREFIX=%{_hal_libdir} \
+	-DCMAKE_HAL_LICENSEDIR_PREFIX=%{_hal_licensedir} \
+
+make %{?jobs:-j%jobs}
+
+%install
+rm -rf %{buildroot}
+
+%make_install
+
+%post
+/sbin/ldconfig
+systemd-tmpfiles /hal/lib/tmpfiles.d/pass-hal.conf --create
+if [ -f %{_unitdir}/pass.service ]; then
+	systemctl try-restart pass.service
+fi
+
+%postun
+/sbin/ldconfig
+if [ -f %{_unitdir}/pass.service ]; then
+	systemctl try-restart pass.service
+fi
+
+%files
+%manifest %{name}.manifest
+%{_hal_licensedir}/%{name}/LICENSE
+%{_hal_libdir}/*.so
+/hal/lib/tmpfiles.d/pass-hal.conf
diff --git a/scripts/pass-hal.conf b/scripts/pass-hal.conf
new file mode 100644
index 0000000..04be8cd
--- /dev/null
+++ b/scripts/pass-hal.conf
@@ -0,0 +1,42 @@
+z	/sys/devices/system/cpu/*/online	0660	root	system_fw	-
+t	/sys/devices/system/cpu/*/online	-	-	-	-	 security.SMACK64="System::Shared"
+z	/sys/devices/system/cpu/*/cpufreq/scaling_available_governors	0440	root	system_fw	-
+t	/sys/devices/system/cpu/*/cpufreq/scaling_available_governors	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/system/cpu/*/cpufreq/cpuinfo_cur_freq	0440	root	system_fw	-
+t	/sys/devices/system/cpu/*/cpufreq/cpuinfo_cur_freq	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/system/cpu/*/cpufreq/cpuinfo_min_freq	0440	root	system_fw	-
+t	/sys/devices/system/cpu/*/cpufreq/cpuinfo_min_freq	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/system/cpu/*/cpufreq/cpuinfo_max_freq	0440	root	system_fw	-
+t	/sys/devices/system/cpu/*/cpufreq/cpuinfo_max_freq	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/system/cpu/*/cpufreq/scaling_governor	0660	root	system_fw	-
+t	/sys/devices/system/cpu/*/cpufreq/scaling_governor	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/system/cpu/*/cpufreq/scaling_min_freq	0660	root	system_fw	-
+t	/sys/devices/system/cpu/*/cpufreq/scaling_min_freq	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/system/cpu/*/cpufreq/scaling_max_freq	0660	root	system_fw	-
+t	/sys/devices/system/cpu/*/cpufreq/scaling_max_freq	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/system/cpu/*/cpufreq/ondemand/up_threshold	0660	root	system_fw	-
+t	/sys/devices/system/cpu/*/cpufreq/ondemand/up_threshold	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/system/cpu/*/cpufreq/ondemand/sampling_rate	0660	root	system_fw	-
+t	/sys/devices/system/cpu/*/cpufreq/ondemand/sampling_rate	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/class/thermal/*/temp	0440	root	system_fw	-
+t	/sys/class/thermal/*/temp	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/class/thermal/*/policy	0440	root	system_fw	-
+t	/sys/class/thermal/*/policy	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/kernel/debug/cpufreq/*/load_table	0440	root	system_fw	-
+t	/sys/kernel/debug/cpufreq/*/load_table	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/kernel/debug/cpufreq/*/load_table	0440	root	system_fw	-
+t	/sys/kernel/debug/cpufreq/*/load_table	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/platform/soc/*/devfreq/*/cur_freq	0440	root	system_fw	-
+t	/sys/devices/platform/soc/*/devfreq/*/cur_freq	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/platform/soc/*/devfreq/*/governor	0660	root	system_fw	-
+t	/sys/devices/platform/soc/*/devfreq/*/governor	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/platform/soc/*/devfreq/*/min_freq	0660	root	system_fw	-
+t	/sys/devices/platform/soc/*/devfreq/*/min_freq	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/platform/soc/*/devfreq/*/max_freq	0660	root	system_fw	-
+t	/sys/devices/platform/soc/*/devfreq/*/max_freq	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/platform/soc/*/devfreq/*/polling_interval	0660	root	system_fw	-
+t	/sys/devices/platform/soc/*/devfreq/*/polling_interval	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/devices/platform/soc/*/devfreq/*/available_frequencies	0440	root	system_fw	-
+t	/sys/devices/platform/soc/*/devfreq/*/available_frequencies	-	-	-	-	security.SMACK64="System::Shared"
+z	/sys/kernel/debug/fault_around_bytes	0660	root	system_fw	-
+t	/sys/kernel/debug/fault_around_bytes	-	-	-	-	security.SMACK64="System::Shared"
diff --git a/src/hal-backend-power.c b/src/hal-backend-power.c
new file mode 100644
index 0000000..c4f52ad
--- /dev/null
+++ b/src/hal-backend-power.c
@@ -0,0 +1,775 @@
+/*
+ * HAL backend for hal-api-power which is used for PASS daemon
+ *
+ * Copyright (c) 2021 Samsung Electronics Co., 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.
+ */
+
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <hal/hal-power-interface.h>
+
+#include "sysfs.h"
+
+#define BUFF_MAX	255
+
+/*************************
+ * H/W Resource Defintions
+ */
+#define CPUFREQ_PATH_PREFIX			"/sys/devices/system/cpu/"
+#define CPUFREQ_CURR_GOVERNOR_PATH_SUFFIX	"/cpufreq/scaling_governor"
+#define CPUFREQ_AVAIL_GOVERNOR_PATH_SUFFIX	"/cpufreq/scaling_available_governors"
+
+/*
+ * The cpuinfo_cur_freq indicates the actual operating CPU freqeuncy
+ * and scaling_cur_freq is the CPU frequency set by the CPUFREQ policy.
+ */
+#define CPUFREQ_CURR_FREQ_PATH_SUFFIX		"/cpufreq/cpuinfo_cur_freq"
+#define CPUFREQ_AVAILABLE_MIN_FREQ_PATH_SUFFIX	"/cpufreq/cpuinfo_min_freq"
+#define CPUFREQ_AVAILABLE_MAX_FREQ_PATH_SUFFIX	"/cpufreq/cpuinfo_max_freq"
+#define CPUFREQ_MIN_FREQ_PATH_SUFFIX		"/cpufreq/scaling_min_freq"
+#define CPUFREQ_MAX_FREQ_PATH_SUFFIX		"/cpufreq/scaling_max_freq"
+#define CPUFREQ_UP_THRESHOLD_PATH_SUFFIX	"/cpufreq/ondemand/up_threshold"
+
+#define CPU_ONLINE_PATH_PREFIX			"/sys/devices/system/cpu/cpu"
+#define CPU_ONLINE_PATH_SUFFIX			"/online"
+#define CPU_ONLINE_STATE_ON			1
+#define CPU_ONLINE_STATE_OFF			0
+
+#define TMU_PATH_PREFIX				"/sys/class/thermal/"
+#define TMU_TEMP_PATH_SUFFIX			"/temp"
+#define TMU_POLICY_PATH_SUFFIX			"/policy"
+#define TMU_MAX_TEMP_MASK				0xFFFFF
+
+#define DEVFREQ_BUS_PATH_PREFIX			"/sys/class/devfreq/"
+#define DEVFREQ_BUS_CURR_GOVERNOR_PATH_SUFFIX	"/governor"
+#define DEVFREQ_BUS_CURR_FREQ_PATH_SUFFIX	"/cur_freq"
+#define DEVFREQ_BUS_MIN_FREQ_PATH_SUFFIX	"/min_freq"
+#define DEVFREQ_BUS_MAX_FREQ_PATH_SUFFIX	"/max_freq"
+#define DEVFREQ_BUS_AVAILABLE_FREQ_PATH_SUFFIX	"/available_frequencies"
+
+#define FAULT_AROUND_BYTES_PATH			"/sys/kernel/debug/fault_around_bytes"
+
+/*************************************************
+ * HAL backend implementation for CPU H/W Resource
+ */
+static int cpufreq_dvfs_get_curr_governor(char *res_name, char *governor)
+{
+	char path[PATH_MAX];
+	int ret;
+
+	if ((!res_name) || (!governor))
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		CPUFREQ_PATH_PREFIX,
+		res_name,
+		CPUFREQ_CURR_GOVERNOR_PATH_SUFFIX);
+
+	ret = sysfs_read_str(path, governor, BUFF_MAX);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int cpufreq_dvfs_set_curr_governor(char *res_name, char *governor)
+{
+	char path[PATH_MAX];
+	int ret;
+
+	if ((!res_name) || (!governor))
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		CPUFREQ_PATH_PREFIX,
+		res_name,
+		CPUFREQ_CURR_GOVERNOR_PATH_SUFFIX);
+
+	ret = sysfs_write_str(path, governor);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int cpufreq_dvfs_get_curr_freq(char *res_name)
+{
+	char path[PATH_MAX];
+	int freq, ret;
+
+	if (!res_name)
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		CPUFREQ_PATH_PREFIX,
+		res_name,
+		CPUFREQ_CURR_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_read_int(path, &freq);
+	if (ret < 0)
+		return ret;
+
+	return freq;
+}
+
+static int cpufreq_dvfs_get_min_freq(char *res_name)
+{
+	char path[PATH_MAX];
+	int freq, ret;
+
+	if (!res_name)
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		CPUFREQ_PATH_PREFIX,
+		res_name,
+		CPUFREQ_MIN_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_read_int(path, &freq);
+	if (ret < 0)
+		return ret;
+
+	return freq;
+}
+
+static int cpufreq_dvfs_set_min_freq(char *res_name, int freq)
+{
+	char path[PATH_MAX];
+	int ret;
+
+	if ((!res_name) || (freq < 0))
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		CPUFREQ_PATH_PREFIX,
+		res_name,
+		CPUFREQ_MIN_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_write_int(path, freq);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int cpufreq_dvfs_get_max_freq(char *res_name)
+{
+	char path[PATH_MAX];
+	int freq, ret;
+
+	if (!res_name)
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		CPUFREQ_PATH_PREFIX,
+		res_name,
+		CPUFREQ_MAX_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_read_int(path, &freq);
+	if (ret < 0)
+		return ret;
+
+	return freq;
+}
+
+static int cpufreq_dvfs_set_max_freq(char *res_name, int freq)
+{
+	char path[PATH_MAX];
+	int ret;
+
+	if ((!res_name) || (freq < 0))
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		CPUFREQ_PATH_PREFIX,
+		res_name,
+		CPUFREQ_MAX_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_write_int(path, freq);
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+
+static int cpufreq_dvfs_get_available_min_freq(char *res_name)
+{
+	char path[PATH_MAX];
+	int val, ret;
+
+	if (!res_name)
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		CPUFREQ_PATH_PREFIX,
+		res_name,
+		CPUFREQ_AVAILABLE_MIN_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_read_int(path, &val);
+	if (ret < 0)
+		return ret;
+
+	return val;
+}
+
+
+static int cpufreq_dvfs_get_available_max_freq(char *res_name)
+{
+	char path[PATH_MAX];
+	int val, ret;
+
+	if (!res_name)
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		CPUFREQ_PATH_PREFIX,
+		res_name,
+		CPUFREQ_AVAILABLE_MAX_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_read_int(path, &val);
+	if (ret < 0)
+		return ret;
+
+	return val;
+}
+
+static int cpufreq_dvfs_get_up_threshold(char *res_name)
+{
+	char path[PATH_MAX];
+	int val, ret;
+
+	if (!res_name)
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		CPUFREQ_PATH_PREFIX,
+		res_name,
+		CPUFREQ_UP_THRESHOLD_PATH_SUFFIX);
+
+	ret = sysfs_read_int(path, &val);
+	if (ret < 0)
+		return ret;
+
+	return val;
+}
+
+static int cpufreq_dvfs_set_up_threshold(char *res_name, int up_threshold)
+{
+	char path[PATH_MAX];
+	int ret;
+
+	if ((!res_name) || (up_threshold < 0))
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		CPUFREQ_PATH_PREFIX,
+		res_name,
+		CPUFREQ_UP_THRESHOLD_PATH_SUFFIX);
+
+	ret = sysfs_write_int(path, up_threshold);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static struct pass_resource_dvfs_ops cpufreq_dvfs_ops =  {
+	.get_curr_governor = cpufreq_dvfs_get_curr_governor,
+	.set_curr_governor = cpufreq_dvfs_set_curr_governor,
+	.get_curr_freq = cpufreq_dvfs_get_curr_freq,
+	.get_min_freq = cpufreq_dvfs_get_min_freq,
+	.set_min_freq = cpufreq_dvfs_set_min_freq,
+	.get_max_freq = cpufreq_dvfs_get_max_freq,
+	.set_max_freq = cpufreq_dvfs_set_max_freq,
+	.get_available_min_freq = cpufreq_dvfs_get_available_min_freq,
+	.get_available_max_freq = cpufreq_dvfs_get_available_max_freq,
+	.get_up_threshold = cpufreq_dvfs_get_up_threshold,
+	.set_up_threshold = cpufreq_dvfs_set_up_threshold,
+};
+
+static int cpu_hotplug_get_online_state(char *res_name, int cpu)
+{
+	char path[PATH_MAX];
+	int ret, online;
+
+	if ((!res_name))
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%d%s",
+		CPU_ONLINE_PATH_PREFIX,
+		cpu,
+		CPU_ONLINE_PATH_SUFFIX);
+
+	ret = sysfs_read_int(path, &online);
+	if (ret < 0)
+		return ret;
+
+	return online;
+}
+
+static int cpu_hotplug_set_online_state(char *res_name, int cpu, int on)
+{
+	char path[PATH_MAX];
+	int ret;
+
+	if ((!res_name))
+		return -EINVAL;
+	if ((on != CPU_ONLINE_STATE_ON) && (on != CPU_ONLINE_STATE_OFF))
+		return -EINVAL;
+
+	/*
+	 * NOTE: Exynos SoC series cannot turn off the CPU0
+	 * because of h/w design. To prevent the critical problem,
+	 * if someone try to turn off the CPU0, just return without any
+	 * opertaion.
+	 */
+	if (on == 0 && cpu == 0) {
+		return 0;
+	}
+
+	snprintf(path, PATH_MAX, "%s%d%s",
+		CPU_ONLINE_PATH_PREFIX,
+		cpu,
+		CPU_ONLINE_PATH_SUFFIX);
+
+	ret = sysfs_write_int(path, on);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static struct pass_resource_hotplug_ops cpu_hotplus_ops = {
+	.get_online_state = cpu_hotplug_get_online_state,
+	.set_online_state = cpu_hotplug_set_online_state,
+	.get_online_min_num = NULL,
+	.set_online_min_num = NULL,
+	.get_online_max_num = NULL,
+	.set_online_max_num = NULL,
+};
+
+static int tmu_get_temp(char *res_thermal_name)
+{
+	char path[PATH_MAX];
+	int temp, ret;
+
+	if (!res_thermal_name)
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		TMU_PATH_PREFIX,
+		res_thermal_name,
+		TMU_TEMP_PATH_SUFFIX);
+
+	ret = sysfs_read_int(path, &temp);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Thermal framework provides the current temperature
+	 * as five digits interger like 54430 when temperature is 54.430
+	 * degrees centigrade. But, Thermal Monitor in Tizen usually
+	 * use two digits interger without decimal point.
+	 * So that round temperature value. It constraints the maximume
+	 * temperature as 1048 degrees centigrade for preventing integer
+	 * overflow. Usually, the embedded device never over 1000 degrees
+	 * centigrade.
+	 */
+	return (((temp & TMU_MAX_TEMP_MASK) + 500) / 1000);
+}
+
+static int tmu_get_policy(char *res_thermal_name, char *policy)
+{
+	char path[PATH_MAX];
+	int ret;
+
+	if ((!res_thermal_name) || (!policy))
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		TMU_PATH_PREFIX,
+		res_thermal_name,
+		TMU_POLICY_PATH_SUFFIX);
+
+	ret = sysfs_read_str(path, policy, BUFF_MAX);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static struct pass_resource_tmu_ops tmu_ops = {
+	.get_temp = tmu_get_temp,
+	.get_policy = tmu_get_policy,
+};
+
+/*****************************************************
+ * HAL backend implementation for BUS/GPU H/W Resource
+ */
+static int devfreq_dvfs_get_curr_governor(char *res_name, char *governor)
+{
+	char path[PATH_MAX];
+	int ret;
+
+	if ((!res_name) || (!governor))
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		DEVFREQ_BUS_PATH_PREFIX,
+		res_name,
+		DEVFREQ_BUS_CURR_GOVERNOR_PATH_SUFFIX);
+
+	ret = sysfs_read_str(path, governor, BUFF_MAX);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int devfreq_dvfs_set_curr_governor(char *res_name, char *governor)
+{
+	char path[PATH_MAX];
+	int ret;
+
+	if ((!res_name) || (!governor))
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		DEVFREQ_BUS_PATH_PREFIX,
+		res_name,
+		DEVFREQ_BUS_CURR_GOVERNOR_PATH_SUFFIX);
+
+	ret = sysfs_write_str(path, governor);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int devfreq_dvfs_get_curr_freq(char *res_name)
+{
+	char path[PATH_MAX];
+	int freq, ret;
+
+	if (!res_name)
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		DEVFREQ_BUS_PATH_PREFIX,
+		res_name,
+		DEVFREQ_BUS_CURR_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_read_int(path, &freq);
+	if (ret < 0)
+		return ret;
+
+	return freq;
+}
+
+static int devfreq_dvfs_get_min_freq(char *res_name)
+{
+	char path[PATH_MAX];
+	int freq, ret;
+
+	if (!res_name)
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		DEVFREQ_BUS_PATH_PREFIX,
+		res_name,
+		DEVFREQ_BUS_MIN_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_read_int(path, &freq);
+	if (ret < 0)
+		return ret;
+
+	return freq;
+}
+
+static int devfreq_dvfs_set_min_freq(char *res_name, int freq)
+{
+	char path[PATH_MAX];
+	int ret;
+
+	if ((!res_name) || (freq < 0))
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		DEVFREQ_BUS_PATH_PREFIX,
+		res_name,
+		DEVFREQ_BUS_MIN_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_write_int(path, freq);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int devfreq_dvfs_get_max_freq(char *res_name)
+{
+	char path[PATH_MAX];
+	int freq, ret;
+
+	if (!res_name)
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		DEVFREQ_BUS_PATH_PREFIX,
+		res_name,
+		DEVFREQ_BUS_MAX_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_read_int(path, &freq);
+	if (ret < 0)
+		return ret;
+
+	return freq;
+}
+
+static int devfreq_dvfs_set_max_freq(char *res_name, int freq)
+{
+	char path[PATH_MAX];
+	int ret;
+
+	if ((!res_name) || (freq < 0))
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		DEVFREQ_BUS_PATH_PREFIX,
+		res_name,
+		DEVFREQ_BUS_MAX_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_write_int(path, freq);
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+
+static int devfreq_dvfs_get_available_min_freq(char *res_name)
+{
+	char path[PATH_MAX];
+	char buf[MAX_BUF_SIZE + 1];
+	char *p;
+	int ret;
+
+	if (!res_name)
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		DEVFREQ_BUS_PATH_PREFIX,
+		res_name,
+		DEVFREQ_BUS_AVAILABLE_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_read_str(path, buf, MAX_BUF_SIZE);
+	if (ret < 0)
+		return ret;
+
+	p = strchr(buf, ' ');
+	if (p)
+		*p = '\0';
+
+	ret = strtoul(buf, NULL, 10);
+	if (!ret)
+		return -EINVAL;
+
+	return ret;
+}
+
+static int devfreq_dvfs_get_available_max_freq(char *res_name)
+{
+	char path[PATH_MAX];
+	char buf[MAX_BUF_SIZE + 1];
+	char *p;
+	int ret;
+
+	if (!res_name)
+		return -EINVAL;
+
+	snprintf(path, PATH_MAX, "%s%s%s",
+		DEVFREQ_BUS_PATH_PREFIX,
+		res_name,
+		DEVFREQ_BUS_AVAILABLE_FREQ_PATH_SUFFIX);
+
+	ret = sysfs_read_str(path, buf, MAX_BUF_SIZE);
+	if (ret < 0)
+		return ret;
+
+	p = strrchr(buf, ' ');
+	p = p ? p + 1 : buf;
+
+	ret = strtoul(p, NULL, 10);
+	if (!ret)
+		return -EINVAL;
+
+	return ret;
+}
+
+static struct pass_resource_dvfs_ops devfreq_dvfs_ops =  {
+	.get_curr_governor = devfreq_dvfs_get_curr_governor,
+	.set_curr_governor = devfreq_dvfs_set_curr_governor,
+	.get_curr_freq = devfreq_dvfs_get_curr_freq,
+	.get_min_freq = devfreq_dvfs_get_min_freq,
+	.set_min_freq = devfreq_dvfs_set_min_freq,
+	.get_max_freq = devfreq_dvfs_get_max_freq,
+	.set_max_freq = devfreq_dvfs_set_max_freq,
+	.get_available_min_freq = devfreq_dvfs_get_available_min_freq,
+	.get_available_max_freq = devfreq_dvfs_get_available_max_freq,
+};
+
+/****************************************************
+ * HAL backend implementation for Memory H/W Resource
+ */
+static int memory_get_fault_around_bytes(char *res_name)
+{
+	int ret, fault_around_bytes;
+
+	if (!res_name)
+		return -EINVAL;
+
+	ret = sysfs_read_int(FAULT_AROUND_BYTES_PATH, &fault_around_bytes);
+	if (ret < 0)
+		return ret;
+
+	return fault_around_bytes;
+}
+
+static int memory_set_fault_around_bytes(char *res_name,
+						int fault_around_bytes)
+{
+	int ret;
+
+	if ((!res_name) || (fault_around_bytes <= 0))
+		return -EINVAL;
+
+	ret = sysfs_write_int(FAULT_AROUND_BYTES_PATH, fault_around_bytes);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+/************************
+ * HAL backend power data
+ */
+static int power_init(void **data)
+{
+	hal_backend_power_funcs *power_funcs = NULL;
+	struct pass_resource_cpu *cpu = NULL;
+	struct pass_resource_bus *bus = NULL;
+	struct pass_resource_gpu *gpu = NULL;
+	struct pass_resource_memory *memory = NULL;
+	int ret;
+
+	/* Allocate memory */
+	power_funcs = calloc(1, sizeof(hal_backend_power_funcs));
+	if (!power_funcs)
+		return -ENOMEM;
+
+	cpu = calloc(1, sizeof(struct pass_resource_cpu));
+	if (!cpu) {
+		ret = -ENOMEM;
+		goto err_funcs;
+	}
+
+	bus = calloc(1, sizeof(struct pass_resource_bus));
+	if (!bus) {
+		ret = -ENOMEM;
+		goto err_cpu;
+	}
+
+	gpu = calloc(1, sizeof(struct pass_resource_gpu));
+	if (!gpu) {
+		ret = -ENOMEM;
+		goto err_bus;
+	}
+
+	memory = calloc(1, sizeof(struct pass_resource_memory));
+	if (!memory) {
+		ret = -ENOMEM;
+		goto err_gpu;
+	}
+
+	/* Initialize each h/w resource */
+	cpu->dvfs = cpufreq_dvfs_ops;
+	cpu->hotplug = cpu_hotplus_ops;
+	cpu->tmu = tmu_ops;
+
+	bus->dvfs = devfreq_dvfs_ops;
+	bus->tmu = tmu_ops;
+
+	gpu->dvfs = devfreq_dvfs_ops;
+	gpu->tmu = tmu_ops;
+
+	memory->get_fault_around_bytes = memory_get_fault_around_bytes;
+	memory->set_fault_around_bytes = memory_set_fault_around_bytes;
+
+	/* Initialize hal_backend_power_funcs  */
+	power_funcs->cpu = cpu;
+	power_funcs->bus = bus;
+	power_funcs->gpu = gpu;
+	power_funcs->memory = memory;
+
+	*data = (void *)power_funcs;
+
+	return 0;
+
+err_gpu:
+	if (gpu)
+		free(gpu);
+err_bus:
+	if (bus)
+		free(bus);
+err_cpu:
+	if (cpu)
+		free(cpu);
+err_funcs:
+	free(power_funcs);
+
+	return ret;
+}
+
+static int power_exit(void *data)
+{
+	hal_backend_power_funcs *funcs;
+
+	if (!data)
+		return -EINVAL;
+
+	funcs = (hal_backend_power_funcs *)data;
+
+	if (funcs->cpu)
+		free(funcs->cpu);
+	if (funcs->bus)
+		free(funcs->bus);
+	if (funcs->gpu)
+		free(funcs->gpu);
+	if (funcs->memory)
+		free(funcs->memory);
+
+	free(funcs);
+
+	return 0;
+}
+
+hal_backend hal_backend_power_data = {
+	.name = "power-cpu",
+	.vendor = "",
+	.abi_version = HAL_ABI_VERSION_TIZEN_6_5,
+	.init = power_init,
+	.exit = power_exit,
+};
diff --git a/src/sysfs.c b/src/sysfs.c
new file mode 100644
index 0000000..23768ce
--- /dev/null
+++ b/src/sysfs.c
@@ -0,0 +1,129 @@
+/*
+ * PASS (Power Aware System Service)
+ *
+ * Copyright (c) 2017 Samsung Electronics Co., 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.
+ */
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "sysfs.h"
+
+static int sysfs_read_buf(char *path, char *buf, int len)
+{
+	int r, fd;
+
+	if ((!path) || (!buf) || (len < 0))
+		return -EINVAL;
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return -ENOENT;
+
+	r = read(fd, buf, len);
+	close(fd);
+
+	if (r < 0)
+		return r;
+	if (r > len)
+		return -EIO;
+
+	buf[r] = '\0';
+
+	return 0;
+}
+
+static int sysfs_write_buf(char *path, char *buf)
+{
+	int w, fd;
+
+	if ((!path) || (!buf))
+		return -EINVAL;
+
+	fd = open(path, O_WRONLY);
+	if (fd == -1)
+		return -ENOENT;
+
+	w = write(fd, buf, strlen(buf));
+	close(fd);
+
+	if (w < 0)
+		return w;
+
+	return 0;
+}
+
+int sysfs_read_int(char *path, int *val)
+{
+	char buf[MAX_BUF_SIZE + 1];
+	int r;
+
+	if ((!path) || (!val))
+		return -EINVAL;
+
+	r = sysfs_read_buf(path, buf, MAX_BUF_SIZE);
+	if (r < 0)
+		return r;
+
+	*val = atoi(buf);
+	return 0;
+}
+
+int sysfs_read_str(char *path, char *str, int len)
+{
+	int r;
+
+	if ((!path) || (!str) || (len <= 0))
+		return -EINVAL;
+
+	r = sysfs_read_buf(path, str, len);
+	if (r < 0)
+		return r;
+
+	return 0;
+}
+
+int sysfs_write_int(char *path, int val)
+{
+	char buf[MAX_BUF_SIZE + 1];
+	int w;
+
+	if (!path)
+		return -EINVAL;
+
+	snprintf(buf, MAX_BUF_SIZE, "%d", val);
+	w = sysfs_write_buf(path, buf);
+	if (w < 0)
+		return w;
+
+	return 0;
+}
+
+int sysfs_write_str(char *path, char *str)
+{
+	int w;
+
+	if ((!path) || (!str))
+		return -EINVAL;
+
+	w = sysfs_write_buf(path, str);
+	if (w < 0)
+		return w;
+
+	return 0;
+}
diff --git a/src/sysfs.h b/src/sysfs.h
new file mode 100644
index 0000000..174804f
--- /dev/null
+++ b/src/sysfs.h
@@ -0,0 +1,6 @@
+#define MAX_BUF_SIZE	255
+
+int sysfs_read_int(char *path, int *val);
+int sysfs_read_str(char *path, char *str, int len);
+int sysfs_write_int(char *path, int val);
+int sysfs_write_str(char *path, char *str);