potter: import some cmhw features

Change-Id: I20278917c6016e102ed8ef8d9b043c5ac4159274

BoardConfig.mk

@@ -88,6 +88,7 @@ BOARD_NO_CHARGER_LED := true
 
 # CMHW
 BOARD_USES_CYANOGEN_HARDWARE := true
+BOARD_HARDWARE_CLASS += $(DEVICE_PATH)/cmhw
 
 # Crypto
 TARGET_HW_DISK_ENCRYPTION := true

cmhw/org/cyanogenmod/hardware/DisplayModeControl.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2015 The CyanogenMod 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.
+ */
+
+package org.cyanogenmod.hardware;
+
+import android.util.Log;
+
+import cyanogenmod.hardware.DisplayMode;
+
+/*
+ * Display Modes API
+ *
+ * A device may implement a list of preset display modes for different
+ * viewing intents, such as movies, photos, or extra vibrance. These
+ * modes may have multiple components such as gamma correction, white
+ * point adjustment, etc, but are activated by a single control point.
+ *
+ * This API provides support for enumerating and selecting the
+ * modes supported by the hardware.
+ */
+
+public class DisplayModeControl {
+
+    private static final boolean sHasNativeSupport =
+            LiveDisplayVendorImpl.hasNativeFeature(LiveDisplayVendorImpl.DISPLAY_MODES);
+
+    /*
+     * All HAF classes should export this boolean.
+     * Real implementations must, of course, return true
+     */
+    public static boolean isSupported() {
+        return sHasNativeSupport;
+    }
+
+    /*
+     * Get the list of available modes. A mode has an integer
+     * identifier and a string name.
+     *
+     * It is the responsibility of the upper layers to
+     * map the name to a human-readable format or perform translation.
+     */
+    public static DisplayMode[] getAvailableModes() {
+        if (!sHasNativeSupport) {
+            return new DisplayMode[0];
+        }
+        return LiveDisplayVendorImpl.native_getDisplayModes();
+    }
+
+    /*
+     * Get the name of the currently selected mode. This can return
+     * null if no mode is selected.
+     */
+    public static DisplayMode getCurrentMode() {
+        if (!sHasNativeSupport) {
+            return null;
+        }
+        return LiveDisplayVendorImpl.native_getCurrentDisplayMode();
+    }
+
+    /*
+     * Selects a mode from the list of available modes by it's
+     * string identifier. Returns true on success, false for
+     * failure. It is up to the implementation to determine
+     * if this mode is valid.
+     */
+    public static boolean setMode(DisplayMode mode, boolean makeDefault) {
+        if (!sHasNativeSupport) {
+            return false;
+        }
+        return LiveDisplayVendorImpl.native_setDisplayMode(mode, makeDefault);
+    }
+
+    /*
+     * Gets the preferred default mode for this device by it's
+     * string identifier. Can return null if there is no default.
+     */
+    public static DisplayMode getDefaultMode() {
+        if (!sHasNativeSupport) {
+            return null;
+        }
+        return LiveDisplayVendorImpl.native_getDefaultDisplayMode();
+    }
+}

cmhw/org/cyanogenmod/hardware/LiveDisplayVendorImpl.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2015 The CyanogenMod 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.
+ */
+
+package org.cyanogenmod.hardware;
+
+import android.util.Log;
+import android.util.Range;
+
+import cyanogenmod.hardware.DisplayMode;
+import cyanogenmod.hardware.HSIC;
+
+/**
+ * This class loads an implementation of the LiveDisplay native interface.
+ */
+public class LiveDisplayVendorImpl {
+
+    public static final String TAG = "LiveDisplayVendorImpl";
+
+    public static final int DISPLAY_MODES = 0x1;
+    public static final int COLOR_BALANCE = 0x2;
+    public static final int OUTDOOR_MODE = 0x4;
+    public static final int ADAPTIVE_BACKLIGHT = 0x8;
+    public static final int PICTURE_ADJUSTMENT = 0x10;
+
+    private static boolean sNativeLibraryLoaded;
+    private static int     sFeatures;
+
+    static {
+        try {
+            System.loadLibrary("jni_livedisplay");
+
+            final int features = native_getSupportedFeatures();
+            if (features > 0) {
+                Log.i(TAG, "Using native LiveDisplay backend (features: " + sFeatures + ")");
+            }
+
+            sNativeLibraryLoaded = features > 0;
+            sFeatures = features;
+        } catch (Throwable t) {
+            sNativeLibraryLoaded = false;
+            sFeatures = 0;
+        }
+    }
+
+    public static boolean hasNativeFeature(int feature) {
+        return sNativeLibraryLoaded && ((sFeatures & feature) != 0);
+    }
+
+    private static native int native_getSupportedFeatures();
+
+    public static native DisplayMode[] native_getDisplayModes();
+    public static native DisplayMode native_getCurrentDisplayMode();
+    public static native DisplayMode native_getDefaultDisplayMode();
+    public static native boolean native_setDisplayMode(DisplayMode mode, boolean makeDefault);
+
+    public static native boolean native_setAdaptiveBacklightEnabled(boolean enabled);
+    public static native boolean native_isAdaptiveBacklightEnabled();
+
+    public static native boolean native_setOutdoorModeEnabled(boolean enabled);
+    public static native boolean native_isOutdoorModeEnabled();
+
+    public static native Range<Integer> native_getColorBalanceRange();
+    public static native int native_getColorBalance();
+    public static native boolean native_setColorBalance(int value);
+
+    public static native boolean native_setPictureAdjustment(final HSIC hsic);
+    public static native HSIC native_getPictureAdjustment();
+    public static native HSIC native_getDefaultPictureAdjustment();
+
+    public static native Range<Float> native_getHueRange();
+    public static native Range<Float> native_getSaturationRange();
+    public static native Range<Float> native_getIntensityRange();
+    public static native Range<Float> native_getContrastRange();
+    public static native Range<Float> native_getSaturationThresholdRange();
+}

cmhw/org/cyanogenmod/hardware/PersistentStorage.java

@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2015 The CyanogenMod 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.
+ */
+
+package org.cyanogenmod.hardware;
+
+import android.os.FileUtils;
+import android.util.Slog;
+
+import java.io.File;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.security.MessageDigest;
+import java.util.concurrent.locks.ReadWriteLock;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+/**
+ * Support for storage of key-value pairs which persists across device wipes /
+ * factory resets. This is used for various security related features. A
+ * reasonable implementation of this needs to store items on a partition which
+ * is unaffected by factory reset. The actual format of the storage is left up
+ * to the implementation. The implementation in this file is suitable for
+ * devices which have a /persist partition (recent QCOM devices fit this
+ * criteria).
+ */
+public class PersistentStorage {
+
+    public static final int MAX_KEY_LEN = 64;
+    public static final int MAX_VALUE_LEN = 4096;
+
+    private static final String TAG = "PersistentStorage";
+
+    private static final String PERSIST_DATA_PATH = "/persist/properties";
+
+    private static final boolean DEBUG = false;
+
+    private static final ReadWriteLock rwl = new ReentrantReadWriteLock();
+
+    /**
+     * Whether device supports persistent properties
+     *
+     * @return boolean Supported devices must return always true
+     */
+    public static boolean isSupported() {
+        final File file = new File(PERSIST_DATA_PATH);
+        return file.exists() && file.isDirectory() && file.canRead() && file.canWrite();
+    }
+
+    /**
+     * Gets an array of bytes from persistent storage.
+     *
+     * @param key
+     * @return previously stored byte array, null if not found
+     */
+    public static byte[] get(String key) {
+        if (!isSupported() || key.length() > MAX_KEY_LEN) {
+            return null;
+        }
+
+        final String encodedKey = encode(key);
+        if (encodedKey == null) {
+            return null;
+        }
+
+        FileInputStream fis = null;
+
+        try {
+            rwl.readLock().lock();
+
+            final File prop = new File(PERSIST_DATA_PATH + "/" + encodedKey);
+
+            if (!prop.exists()) {
+                if (DEBUG) {
+                    Slog.e(TAG, "Unable to read from " + prop.getAbsolutePath());
+                }
+                return null;
+            }
+
+            final byte[] buffer = new byte[MAX_VALUE_LEN];
+            fis = new FileInputStream(prop);
+            ByteArrayOutputStream bos = new ByteArrayOutputStream();
+            int len = fis.read(buffer);
+            bos.write(buffer, 0, len);
+            return bos.toByteArray();
+
+        } catch (Exception e) {
+            Slog.e(TAG, e.getMessage(), e);
+        } finally {
+            if (fis != null) {
+                try {
+                    fis.close();
+                } catch (IOException ex) {
+                    // skip it
+                }
+            }
+            rwl.readLock().unlock();
+        }
+
+        return null;
+    }
+
+    /**
+     * Writes a byte array to persistent storage.
+     *
+     * The storage of the data is implementation specific. In this implementation,
+     * we hash the key with SHA-256 and use the hex string as the stored key.
+     *
+     * Implementations should delete the key if a null buffer is passed.
+     *
+     * @param key
+     * @param buffer
+     * @return true if the operation succeeded
+     */
+    public static boolean set(String key, byte[] buffer) {
+        if (!isSupported() ||
+                key == null || key.length() > MAX_KEY_LEN ||
+                (buffer != null && buffer.length > MAX_VALUE_LEN)) {
+            return false;
+        }
+
+        final String encodedKey = encode(key);
+        if (encodedKey == null) {
+            return false;
+        }
+
+        try {
+            rwl.writeLock().lock();
+
+            final File prop = new File(PERSIST_DATA_PATH + "/" + encodedKey);
+
+            File tmp = null;
+            if (buffer != null) {
+                tmp = File.createTempFile(key, "tmp",
+                        new File(PERSIST_DATA_PATH));
+                if (!FileUtils.copyToFile(new ByteArrayInputStream(buffer), tmp)) {
+                    Slog.e(TAG, "Unable to create temporary file!");
+                    return false;
+                }
+            }
+
+            if (prop.exists()) {
+                prop.delete();
+            }
+
+            if (tmp != null) {
+                tmp.renameTo(prop);
+            }
+
+        } catch (Exception e) {
+            Slog.e(TAG, e.getMessage(), e);
+            return false;
+
+        } finally {
+            rwl.writeLock().unlock();
+        }
+        return true;
+    }
+
+    /**
+     * Used for encoding keys with SHA-256
+     *
+     * @param key
+     * @return
+     */
+    private static String encode(String key) {
+        try {
+            MessageDigest d = MessageDigest.getInstance("SHA-256");
+            byte[] hash = d.digest(key.getBytes("UTF-8"));
+            StringBuilder encoded = new StringBuilder();
+
+            for (byte b : hash) {
+                encoded.append(String.format("%02x", b & 0xff));
+            }
+
+            return encoded.toString();
+        } catch (Exception e) {
+            Slog.e(TAG, e.getMessage(), e);
+        }
+        return null;
+    }
+}

cmhw/org/cyanogenmod/hardware/PictureAdjustment.java

@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2016 The CyanogenMod 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.
+ */
+
+package org.cyanogenmod.hardware;
+
+import android.util.Range;
+
+import cyanogenmod.hardware.HSIC;
+
+/**
+ * Color balance support
+ *
+ * Color balance controls allow direct adjustment of display color temperature
+ * using a range of values. A zero implies no adjustment, negative values
+ * move towards warmer temperatures, and positive values move towards
+ * cool temperatures.
+ */
+public class PictureAdjustment {
+
+    private static final boolean sHasNativeSupport =
+            LiveDisplayVendorImpl.hasNativeFeature(LiveDisplayVendorImpl.PICTURE_ADJUSTMENT);
+
+    /**
+     * Whether device supports color balance control
+     *
+     * @return boolean Supported devices must return always true
+     */
+    public static boolean isSupported() {
+        return sHasNativeSupport;
+    }
+
+    /**
+     * This method returns the current picture adjustment values
+     *
+     * @return HSIC
+     */
+    public static HSIC getHSIC() {
+        if (sHasNativeSupport) {
+            return LiveDisplayVendorImpl.native_getPictureAdjustment();
+        }
+        return null;
+    }
+
+    /**
+     * This method returns the default picture adjustment for the current mode
+     *
+     * @return HSIC
+     */
+    public static HSIC getDefaultHSIC() {
+        if (sHasNativeSupport) {
+            return LiveDisplayVendorImpl.native_getDefaultPictureAdjustment();
+        }
+        return null;
+    }
+
+    /**
+     * This method allows to set the picture adjustment
+     *
+     * @param hsic
+     * @return boolean Must be false if feature is not supported or the operation
+     * failed; true in any other case.
+     */
+    public static boolean setHSIC(final HSIC hsic) {
+        if (sHasNativeSupport) {
+            return LiveDisplayVendorImpl.native_setPictureAdjustment(hsic);
+        }
+        return false;
+    }
+
+    /**
+     * Get the range available for hue adjustment
+     * @return range
+     */
+    public static Range<Float> getHueRange() {
+        if (sHasNativeSupport) {
+            return LiveDisplayVendorImpl.native_getHueRange();
+        }
+        return new Range(0.0f, 0.0f);
+    }
+
+    /**
+     * Get the range available for saturation adjustment
+     * @return range
+     */
+    public static Range<Float> getSaturationRange() {
+        if (sHasNativeSupport) {
+            return LiveDisplayVendorImpl.native_getSaturationRange();
+        }
+        return new Range(0.0f, 0.0f);
+    }
+
+    /**
+     * Get the range available for intensity adjustment
+     * @return range
+     */
+    public static Range<Float> getIntensityRange() {
+        if (sHasNativeSupport) {
+            return LiveDisplayVendorImpl.native_getIntensityRange();
+        }
+        return new Range(0.0f, 0.0f);
+    }
+
+    /**
+     * Get the range available for contrast adjustment
+     * @return range
+     */
+    public static Range<Float> getContrastRange() {
+        if (sHasNativeSupport) {
+            return LiveDisplayVendorImpl.native_getContrastRange();
+        }
+        return new Range(0.0f, 0.0f);
+    }
+
+    /**
+     * Get the range available for saturation threshold adjustment
+     *
+     * This is an adjustable lower limit where the image is fully
+     * desaturated.
+     *
+     * @return range
+     */
+    public static Range<Float> getSaturationThresholdRange() {
+        if (sHasNativeSupport) {
+            return LiveDisplayVendorImpl.native_getSaturationThresholdRange();
+        }
+        return new Range(0.0f, 0.0f);
+    }
+}

cmhw/org/cyanogenmod/hardware/SunlightEnhancement.java

@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2014 The CyanogenMod 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.
+ */
+
+package org.cyanogenmod.hardware;
+
+import org.cyanogenmod.internal.util.FileUtils;
+
+import android.util.Log;
+
+/**
+ * Facemelt mode!
+ */
+public class SunlightEnhancement {
+
+    private static final String TAG = "SunlightEnhancement";
+
+    private static final String FACEMELT_PATH = getFacemeltPath();
+    private static final String FACEMELT_MODE = getFacemeltMode();
+
+    private static final String FILE_HBM = "/sys/class/graphics/fb0/hbm";
+    private static final String FILE_SRE = "/sys/class/graphics/fb0/sre";
+
+    private static final boolean sHasNativeSupport =
+            LiveDisplayVendorImpl.hasNativeFeature(LiveDisplayVendorImpl.OUTDOOR_MODE);
+
+    private static String getFacemeltPath() {
+        if (FileUtils.fileExists(FILE_HBM)) {
+            return FILE_HBM;
+        } else {
+            return FILE_SRE;
+        }
+    }
+
+    private static String getFacemeltMode() {
+        if (FileUtils.fileExists(FILE_HBM)) {
+            return "1";
+        } else {
+            return "2";
+        }
+    }
+
+    /**
+     * Whether device supports sunlight enhancement
+     *
+     * @return boolean Supported devices must return always true
+     */
+    public static boolean isSupported() {
+        if (sHasNativeSupport) {
+            return true;
+        }
+
+        return FileUtils.isFileWritable(FACEMELT_PATH);
+    }
+
+    /**
+     * This method return the current activation status of sunlight enhancement
+     *
+     * @return boolean Must be false when sunlight enhancement is not supported or not activated,
+     * or the operation failed while reading the status; true in any other case.
+     */
+    public static boolean isEnabled() {
+        try {
+            if (sHasNativeSupport) {
+                return LiveDisplayVendorImpl.native_isOutdoorModeEnabled();
+            }
+            return Integer.parseInt(FileUtils.readOneLine(FACEMELT_PATH)) > 0;
+        } catch (Exception e) {
+            Log.e(TAG, e.getMessage(), e);
+        }
+        return false;
+    }
+
+    /**
+     * This method allows to setup sunlight enhancement
+     *
+     * @param status The new sunlight enhancement status
+     * @return boolean Must be false if sunlight enhancement is not supported or the operation
+     * failed; true in any other case.
+     */
+    public static boolean setEnabled(boolean status) {
+        if (sHasNativeSupport) {
+            return LiveDisplayVendorImpl.native_setOutdoorModeEnabled(status);
+        }
+
+        return FileUtils.writeLine(FACEMELT_PATH, status ? FACEMELT_MODE : "0");
+    }
+
+    /**
+     * Whether adaptive backlight (CABL / CABC) is required to be enabled
+     *
+     * @return boolean False if adaptive backlight is not a dependency
+     */
+    public static boolean isAdaptiveBacklightRequired() {
+        return false;
+    }
+
+    /**
+     * Set this to true if the implementation is self-managed and does
+     * it's own ambient sensing. In this case, setEnabled is assumed
+     * to toggle the feature on or off, but not activate it. If set
+     * to false, LiveDisplay will call setEnabled when the ambient lux
+     * threshold is crossed.
+     *
+     * @return true if this enhancement is self-managed
+     */
+    public static boolean isSelfManaged() {
+        return false;
+    }
+}

cmhw/org/cyanogenmod/hardware/UniqueDeviceId.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2016 The CyanogenMod 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.
+ */
+
+package org.cyanogenmod.hardware;
+
+import android.util.Log;
+
+import org.cyanogenmod.internal.util.FileUtils;
+
+/**
+ * Generate a unique but deterministic ID for this hardware, based on unchangeable
+ * hardware serial numbers.
+ */
+public class UniqueDeviceId {
+
+    private static final String TAG = "UniqueDeviceId";
+
+    private static final int TYPE_MMC0_CID = 0;
+
+    private static String sUniqueId = null;
+
+    private static final String MMC_TYPE = "/sys/block/mmcblk0/device/type";
+    private static final String MMC_CID  = "/sys/block/mmcblk0/device/cid";
+
+    /**
+     * Whether device supports reporting a unique device id.
+     *
+     * @return boolean Supported devices must return always true
+     */
+    public static boolean isSupported() {
+        return FileUtils.isFileReadable(MMC_TYPE) &&
+               FileUtils.isFileReadable(MMC_CID) &&
+               getUniqueDeviceIdInternal() != null;
+    }
+
+    /**
+     * This method retreives a unique ID for the device.
+     *
+     * @return String The unique device ID
+     */
+    public static String getUniqueDeviceId() {
+        return getUniqueDeviceIdInternal();
+    }
+
+    private static String getUniqueDeviceIdInternal() {
+        if (sUniqueId != null) {
+            return sUniqueId;
+        }
+
+        try {
+            String sMmcType = FileUtils.readOneLine(MMC_TYPE);
+            String sCid = FileUtils.readOneLine(MMC_CID);
+            if ("MMC".equals(sMmcType) && sCid != null) {
+                sCid = sCid.trim();
+                if (sCid.length() == 32) {
+                    sUniqueId = String.format("%03x00000%32s", TYPE_MMC0_CID, sCid);
+                    return sUniqueId;
+                }
+            }
+        } catch (Exception e) {
+            Log.e(TAG, "Failed to get unique device ID: " + e.getMessage());
+            return null;
+        }
+
+        /* Any additional types should be added here. */
+
+        return null;
+    }
+}

cmhw/org/cyanogenmod/hardware/VibratorHW.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2016 The CyanogenMod 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.
+ */
+
+package org.cyanogenmod.hardware;
+
+import org.cyanogenmod.internal.util.FileUtils;
+
+import android.util.Log;
+
+public class VibratorHW {
+
+    private static final String TAG = "VibratorHW";
+
+    private static final String DEFAULT_PATH = "/sys/class/timed_output/vibrator/vtg_default";
+    private static final String LEVEL_PATH = "/sys/class/timed_output/vibrator/vtg_level";
+    private static final String MAX_PATH = "/sys/class/timed_output/vibrator/vtg_max";
+    private static final String MIN_PATH = "/sys/class/timed_output/vibrator/vtg_min";
+
+    public static boolean isSupported() {
+        return FileUtils.isFileWritable(LEVEL_PATH) &&
+                FileUtils.isFileReadable(DEFAULT_PATH) &&
+                FileUtils.isFileReadable(MAX_PATH) &&
+                FileUtils.isFileReadable(MIN_PATH);
+    }
+
+    public static int getMaxIntensity() {
+        try {
+            return Integer.parseInt(FileUtils.readOneLine(MAX_PATH));
+        } catch (Exception e) {
+            Log.e(TAG, e.getMessage(), e);
+        }
+        return -1;
+    }
+
+    public static int getMinIntensity() {
+        try {
+            return Integer.parseInt(FileUtils.readOneLine(MIN_PATH));
+        } catch (Exception e) {
+            Log.e(TAG, e.getMessage(), e);
+        }
+        return -1;
+    }
+
+    public static int getWarningThreshold() {
+        return -1;
+    }
+
+    public static int getCurIntensity() {
+        try {
+            return Integer.parseInt(FileUtils.readOneLine(LEVEL_PATH));
+        } catch (Exception e) {
+            Log.e(TAG, e.getMessage(), e);
+        }
+        return -1;
+    }
+
+    public static int getDefaultIntensity() {
+        try {
+            return Integer.parseInt(FileUtils.readOneLine(DEFAULT_PATH));
+        } catch (Exception e) {
+            Log.e(TAG, e.getMessage(), e);
+        }
+        return -1;
+    }
+
+    public static boolean setIntensity(int intensity) {
+        return FileUtils.writeLine(LEVEL_PATH, String.valueOf(intensity));
+    }
+}