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diff --git a/msm8909/sdm/libs/core/hw_interface.h b/msm8909/sdm/libs/core/hw_interface.h
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+/*
+* Copyright (c) 2014 - 2017, The Linux Foundation. All rights reserved.
+*
+* Redistribution and use in source and binary forms, with or without modification, are permitted
+* provided that the following conditions are met:
+*    * Redistributions of source code must retain the above copyright notice, this list of
+*      conditions and the following disclaimer.
+*    * Redistributions in binary form must reproduce the above copyright notice, this list of
+*      conditions and the following disclaimer in the documentation and/or other materials provided
+*      with the distribution.
+*    * Neither the name of The Linux Foundation nor the names of its contributors may be used to
+*      endorse or promote products derived from this software without specific prior written
+*      permission.
+*
+* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+* NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef __HW_INTERFACE_H__
+#define __HW_INTERFACE_H__
+
+#include <core/buffer_allocator.h>
+#include <core/buffer_sync_handler.h>
+#include <core/display_interface.h>
+#include <private/hw_info_types.h>
+#include <private/color_interface.h>
+#include <utils/constants.h>
+
+#include "hw_info_interface.h"
+
+namespace sdm {
+
+enum HWScanSupport {
+  kScanNotSupported,
+  kScanAlwaysOverscanned,
+  kScanAlwaysUnderscanned,
+  kScanBoth,
+};
+
+struct HWScanInfo {
+  HWScanSupport pt_scan_support;    // Scan support for preferred timing
+  HWScanSupport it_scan_support;    // Scan support for digital monitor or industry timings
+  HWScanSupport cea_scan_support;   // Scan support for CEA resolution timings
+
+  HWScanInfo() : pt_scan_support(kScanNotSupported), it_scan_support(kScanNotSupported),
+                 cea_scan_support(kScanNotSupported) { }
+};
+
+// HWEventHandler - Implemented in DisplayBase and HWInterface implementation
+class HWEventHandler {
+ public:
+  virtual DisplayError VSync(int64_t timestamp) = 0;
+  virtual DisplayError Blank(bool blank) = 0;
+  virtual void IdleTimeout() = 0;
+  virtual void ThermalEvent(int64_t thermal_level) = 0;
+  virtual void IdlePowerCollapse() = 0;
+
+ protected:
+  virtual ~HWEventHandler() { }
+};
+
+class HWInterface {
+ public:
+  static DisplayError Create(DisplayType type, HWInfoInterface *hw_info_intf,
+                             BufferSyncHandler *buffer_sync_handler,
+                             BufferAllocator *buffer_allocator, HWInterface **intf);
+  static DisplayError Destroy(HWInterface *intf);
+
+  virtual DisplayError Init() = 0;
+  virtual DisplayError Deinit() = 0;
+  virtual DisplayError GetActiveConfig(uint32_t *active_config) = 0;
+  virtual DisplayError GetNumDisplayAttributes(uint32_t *count) = 0;
+  virtual DisplayError GetDisplayAttributes(uint32_t index,
+                                            HWDisplayAttributes *display_attributes) = 0;
+  virtual DisplayError GetHWPanelInfo(HWPanelInfo *panel_info) = 0;
+  virtual DisplayError SetDisplayAttributes(uint32_t index) = 0;
+  virtual DisplayError SetDisplayAttributes(const HWDisplayAttributes &display_attributes) = 0;
+  virtual DisplayError GetConfigIndex(uint32_t mode, uint32_t *index) = 0;
+  virtual DisplayError PowerOn() = 0;
+  virtual DisplayError PowerOff() = 0;
+  virtual DisplayError Doze() = 0;
+  virtual DisplayError DozeSuspend() = 0;
+  virtual DisplayError Standby() = 0;
+  virtual DisplayError Validate(HWLayers *hw_layers) = 0;
+  virtual DisplayError Commit(HWLayers *hw_layers) = 0;
+  virtual DisplayError Flush() = 0;
+  virtual DisplayError GetPPFeaturesVersion(PPFeatureVersion *vers) = 0;
+  virtual DisplayError SetPPFeatures(PPFeaturesConfig *feature_list) = 0;
+  virtual DisplayError SetVSyncState(bool enable) = 0;
+  virtual void SetIdleTimeoutMs(uint32_t timeout_ms) = 0;
+  virtual DisplayError SetDisplayMode(const HWDisplayMode hw_display_mode) = 0;
+  virtual DisplayError SetRefreshRate(uint32_t refresh_rate) = 0;
+  virtual DisplayError SetPanelBrightness(int level) = 0;
+  virtual DisplayError CachePanelBrightness(int level) = 0;
+  virtual DisplayError GetHWScanInfo(HWScanInfo *scan_info) = 0;
+  virtual DisplayError GetVideoFormat(uint32_t config_index, uint32_t *video_format) = 0;
+  virtual DisplayError GetMaxCEAFormat(uint32_t *max_cea_format) = 0;
+  virtual DisplayError SetCursorPosition(HWLayers *hw_layers, int x, int y) = 0;
+  virtual DisplayError OnMinHdcpEncryptionLevelChange(uint32_t min_enc_level) = 0;
+  virtual DisplayError GetPanelBrightness(int *level) = 0;
+  virtual DisplayError SetAutoRefresh(bool enable) = 0;
+  virtual DisplayError SetS3DMode(HWS3DMode s3d_mode) = 0;
+  virtual DisplayError SetScaleLutConfig(HWScaleLutInfo *lut_info) = 0;
+  virtual DisplayError SetMixerAttributes(const HWMixerAttributes &mixer_attributes) = 0;
+  virtual DisplayError GetMixerAttributes(HWMixerAttributes *mixer_attributes) = 0;
+
+ protected:
+  virtual ~HWInterface() { }
+};
+
+}  // namespace sdm
+
+#endif  // __HW_INTERFACE_H__
+