sdm660-common: XiaomiParts: Add Headphone & Mic Gain

* This is manually ported by me from Lavender tree on Corvus-Devices
* Thanks @StyloGey for reviewing the java code and giving me a better solution
* Original repo: https://github.com/Corvus-Devices/device_xiaomi_lavender.git

To get it working, you need these two commits in your kernel:
> c04d6d6e61
> 8e25ac3318

Signed-off-by: OdSazib <odsazib@gmail.com>
Change-Id: I1bb48ced1f23728daa2e5170647ce08a04347110

XiaomiParts/res/drawable/ic_headphone.xml

@@ -0,0 +1,9 @@
+<!-- drawable/headphone-settings.xml -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:height="24dp"
+    android:width="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?android:attr/colorControlNormal">
+    <path android:fillColor="#000000" android:pathData="M12,1A9,9 0 0,1 21,10V17A3,3 0 0,1 18,20H15V12H19V10A7,7 0 0,0 12,3A7,7 0 0,0 5,10V12H9V20H6A3,3 0 0,1 3,17V10A9,9 0 0,1 12,1M15,24V22H17V24H15M11,24V22H13V24H11M7,24V22H9V24H7Z" />
+</vector>

XiaomiParts/res/drawable/ic_mic.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?android:attr/colorControlNormal">
+    <path android:fillColor="#000000" android:pathData="M12 14c1.66 0 3-1.34 3-3V5c0-1.66-1.34-3-3-3S9 3.34 9 5v6c0 1.66 1.34 3 3 3zm-1-9c0-0.55 0.45 -1 1-1s1 0.45 1 1v6c0 0.55-0.45 1-1 1s-1-0.45-1-1V5zm6 6c0 2.76-2.24 5-5 5s-5-2.24-5-5H5c0 3.53 2.61 6.43 6 6.92V21h2v-3.08c3.39-0.49 6-3.39 6-6.92h-2z" />
+</vector>

XiaomiParts/res/values/attrs.xml

@@ -6,5 +6,7 @@
         <attr name="max" format="integer" />
         <attr name="units" format="string|reference" />
         <attr name="defaultText" format="string|reference" />
+        <attr name="showSign" format="boolean" />
+        <attr name="continuousUpdates" format="boolean" />
     </declare-styleable>
 </resources>

XiaomiParts/res/values/strings.xml

@@ -82,7 +82,6 @@
     <string name="preset_warm_amoled">Warm Amoled</string>
     <string name="preset_hybrid_mamba">Hybrid Mamba</string>
 
-
     <string name="hall_wakeup_title">Flip Cover Wakeup</string>
     <string name="hall_title">Enable Flip Cover Wakeup</string>
     <string name="hall_wakeup_summary">Wakeup device via magnetic Flip Cover</string>
@@ -98,4 +97,9 @@
     <!-- FPS Info -->
     <string name="fps_info_title">FPS Overlay</string>
     <string name="fps_info_summary">Show overlay with with current frames per second</string>
+    
+    <!-- Audio amplification -->
+    <string name="audio_amplify">Amplify Audio</string>
+    <string name="headphone_gain">Headphone Gain</string>
+    <string name="mic_gain">Microphone Gain</string>
 </resources>

XiaomiParts/res/xml/preferences_xiaomi_parts.xml

@@ -39,6 +39,27 @@
             app:units="%"
             android:defaultValue="100" />
     </PreferenceCategory>
+    
+    <PreferenceCategory
+       android:key="audio_amplify"
+       android:title="@string/audio_amplify">
+
+        <org.lineageos.settings.device.preferences.CustomSeekBarPreference
+            android:defaultValue="0"
+            android:key="headphone_gain"
+            android:max="20"
+            app:min="-10"
+            android:icon="@drawable/ic_headphone"
+            android:title="@string/headphone_gain"/>
+
+        <org.lineageos.settings.device.preferences.CustomSeekBarPreference
+            android:defaultValue="0"
+            android:key="mic_gain"
+            android:max="20"
+            app:min="-10"
+            android:icon="@drawable/ic_mic"
+            android:title="@string/mic_gain"/>
+    </PreferenceCategory>
 
     <PreferenceCategory
         android:key="display"

XiaomiParts/src/org/lineageos/settings/device/BootReceiver.java

@@ -29,6 +29,9 @@ import java.lang.Math.*;
 
 public class BootReceiver extends BroadcastReceiver implements Utils {
 
+    public static final  String HEADPHONE_GAIN_PATH = "/sys/kernel/sound_control/headphone_gain";
+    public static final  String MIC_GAIN_PATH = "/sys/kernel/sound_control/mic_gain";
+    
     public void onReceive(Context context, Intent intent) {
 
     	SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
@@ -58,6 +61,12 @@ public class BootReceiver extends BroadcastReceiver implements Utils {
             FileUtils.setValue(KCAL_HUE, Settings.Secure.getInt(context.getContentResolver(),
                     PREF_HUE, HUE_DEFAULT));
         }
+        
+        int gain = Settings.Secure.getInt(context.getContentResolver(),
+                DeviceSettings.PREF_HEADPHONE_GAIN, 0);
+        FileUtils.setValue(HEADPHONE_GAIN_PATH, gain + " " + gain);
+        FileUtils.setValue(MIC_GAIN_PATH, Settings.Secure.getInt(context.getContentResolver(),
+                DeviceSettings.PREF_MIC_GAIN, 0));
 
         FileUtils.setValue(DeviceSettings.NOTIF_LED_PATH,(1 + Math.pow(1.05694, Settings.Secure.getInt(
                 context.getContentResolver(), DeviceSettings.PREF_NOTIF_LED, 100))));

XiaomiParts/src/org/lineageos/settings/device/DeviceSettings.java

@@ -32,6 +32,7 @@ import org.lineageos.settings.device.preferences.SecureSettingListPreference;
 import org.lineageos.settings.device.preferences.SecureSettingSwitchPreference;
 import org.lineageos.settings.device.preferences.VibrationSeekBarPreference;
 import org.lineageos.settings.device.preferences.NotificationLedSeekBarPreference;
+import org.lineageos.settings.device.preferences.CustomSeekBarPreference;
 
 import java.lang.Math.*;
 
@@ -47,6 +48,12 @@ public class DeviceSettings extends PreferenceFragment implements
     public static final String NOTIF_LED_PATH = "/sys/class/leds/white/max_brightness";
     
     public static final String PREF_KEY_FPS_INFO = "fps_info";
+    
+    public static final  String CATEGORY_AUDIO_AMPLIFY = "audio_amplify";
+    public static final  String PREF_HEADPHONE_GAIN = "headphone_gain";
+    public static final  String PREF_MIC_GAIN = "mic_gain";
+    public static final  String HEADPHONE_GAIN_PATH = "/sys/kernel/sound_control/headphone_gain";
+    public static final  String MIC_GAIN_PATH = "/sys/kernel/sound_control/mic_gain";
 
     // value of vtg_min and vtg_max
     public static final int MIN_VIBRATION = 116;
@@ -93,6 +100,16 @@ public class DeviceSettings extends PreferenceFragment implements
             VibrationSeekBarPreference vibrationStrength = (VibrationSeekBarPreference) findPreference(PREF_VIBRATION_STRENGTH);
             vibrationStrength.setOnPreferenceChangeListener(this);
         } else { getPreferenceScreen().removePreference(findPreference(CATEGORY_VIBRATOR)); }
+        
+        // Headphone & Mic Gain
+        if (FileUtils.fileWritable(HEADPHONE_GAIN_PATH) && FileUtils.fileWritable(MIC_GAIN_PATH)) {
+           CustomSeekBarPreference headphoneGain = (CustomSeekBarPreference) findPreference(PREF_HEADPHONE_GAIN);
+           headphoneGain.setOnPreferenceChangeListener(this);
+           CustomSeekBarPreference micGain = (CustomSeekBarPreference) findPreference(PREF_MIC_GAIN);
+           micGain.setOnPreferenceChangeListener(this);
+        } else {
+          getPreferenceScreen().removePreference(findPreference(CATEGORY_AUDIO_AMPLIFY));
+        }
 
         PreferenceCategory displayCategory = (PreferenceCategory) findPreference(CATEGORY_DISPLAY);
         if (isAppNotInstalled(DEVICE_DOZE_PACKAGE_NAME)) {
@@ -142,6 +159,14 @@ public class DeviceSettings extends PreferenceFragment implements
                 FileUtils.setValue(VIBRATION_STRENGTH_PATH, vibrationValue);
                 break;
 
+            case PREF_HEADPHONE_GAIN:
+                FileUtils.setValue(HEADPHONE_GAIN_PATH, value + " " + value);
+                break;
+
+            case PREF_MIC_GAIN:
+                FileUtils.setValue(MIC_GAIN_PATH, (int) value);
+                break;
+
             case PREF_THERMAL:
                 mTHERMAL.setValue((String) value);
                 mTHERMAL.setSummary(mTHERMAL.getEntry());

XiaomiParts/src/org/lineageos/settings/device/preferences/CustomSeekBarPreference.java

@@ -21,6 +21,7 @@ import android.content.Context;
 import android.content.res.TypedArray;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceViewHolder;
+import androidx.preference.*;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.util.AttributeSet;

rootdir/etc/init.target.rc

@@ -307,3 +307,4 @@ service vendor.hvdcp_opti /system/vendor/bin/hvdcp_opti
      user root
      group system wakelock
      writepid /dev/cpuset/system-background/tasks
+     

rootdir/etc/init.xiaomi_parts.rc

@@ -26,6 +26,12 @@ on boot
     chmod 0660 /sys/devices/virtual/graphics/fb0/measured_fps
     chown system system /sys/class/graphics/fb0/measured_fps
     chmod 0660 /sys/class/graphics/fb0/measured_fps
+    
+    # Audio Amplification
+    chown system system /sys/kernel/sound_control/headphone_gain
+    chown system system /sys/kernel/sound_control/mic_gain
+    chmod 0660 /sys/kernel/sound_control/headphone_gain
+    chmod 0660 /sys/kernel/sound_control/mic_gain
 
 # KCal
     chown system system /sys/devices/platform/kcal_ctrl.0/kcal_cont

sepolicy/vendor/file.te

@@ -25,3 +25,5 @@ type thermal_data_file, file_type, data_file_type;
 
 # XiamiParts
 type sysfs_fpsinfo, sysfs_type, fs_type;
+type sysfs_headphonegain, sysfs_type, fs_type;
+type sysfs_micgain, sysfs_type, fs_type;

sepolicy/vendor/genfs_contexts

@@ -38,3 +38,5 @@ genfscon sysfs /devices/soc/800f000.qcom,spmi/spmi-0/spmi0-03/800f000.qcom,spmi:
 # XiaomiParts
 genfscon sysfs /devices/virtual/graphics/fb0/measured_fps       u:object_r:sysfs_fpsinfo:s0
 genfscon sysfs /class/graphics/fb0/measured_fps                 u:object_r:sysfs_fpsinfo:s0
+genfscon sysfs /kernel/sound_control/headphone_gain             u:object_r:sysfs_headphonegain:s0
+genfscon sysfs /kernel/sound_control/mic_gain                   u:object_r:sysfs_micgain:s0

sepolicy/vendor/system_app.te

@@ -13,5 +13,6 @@ allow system_app sysfs_graphics:dir search;
 allow system_app sysfs_graphics:file rw_file_perms;
 allow system_app sysfs_leds:dir search;
 allow system_app sysfs_fpsinfo:file rw_file_perms;
-
+allow system_app sysfs_headphonegain:file rw_file_perms;
+allow system_app sysfs_micgain:file rw_file_perms;
 set_prop(system_app, system_prop);