batteryservice: add support for charger led blinking

Add following charger LED behaviour:
If battery SOC is between 15 and 90
- if charger type is HVDCP blink LED (orange color)
- for any other charger type solid orange color.

Change-Id: Ibd0589911f9b6d9c92b331f10d93c4035a8f89b8

1 files changed, 41 insertions, 2 deletions

diff --git a/services/core/java/com/android/server/BatteryService.java b/services/core/java/com/android/server/BatteryService.java
index b3b4651..c3200fe 100644
--- a/services/core/java/com/android/server/BatteryService.java
+++ b/services/core/java/com/android/server/BatteryService.java
@@ -51,6 +51,11 @@ import android.util.Slog;
 import java.io.File;
 import java.io.FileDescriptor;
 import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.BufferedInputStream;
+import java.io.BufferedReader;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.PrintWriter;
 
@@ -735,6 +740,34 @@ public final class BatteryService extends SystemService {
                     com.android.internal.R.integer.config_notificationsBatteryLedOff);
         }
 
+        private boolean isHvdcpPresent() {
+            File mChargerTypeFile = new File("/sys/class/power_supply/usb/type");
+            FileReader fileReader;
+            BufferedReader br;
+            String type;
+            boolean ret;
+
+            try {
+                fileReader = new FileReader(mChargerTypeFile);
+                br = new BufferedReader(fileReader);
+                type =  br.readLine();
+                if (type.regionMatches(true, 0, "USB_HVDCP", 0, 9))
+                    ret = true;
+                else
+                    ret = false;
+                br.close();
+                fileReader.close();
+            } catch (FileNotFoundException e) {
+                ret = false;
+                Slog.e(TAG, "Failure in reading charger type", e);
+            } catch (IOException e) {
+                ret = false;
+                Slog.e(TAG, "Failure in reading charger type", e);
+            }
+
+            return ret;
+        }
+
         /**
          * Synchronize on BatteryService.
          */
@@ -756,8 +789,14 @@ public final class BatteryService extends SystemService {
                     // Solid green when full or charging and nearly full
                     mBatteryLight.setColor(mBatteryFullARGB);
                 } else {
-                    // Solid orange when charging and halfway full
-                    mBatteryLight.setColor(mBatteryMediumARGB);
+                    if (isHvdcpPresent()) {
+                        // Blinking orange if HVDCP charger
+                        mBatteryLight.setFlashing(mBatteryMediumARGB, Light.LIGHT_FLASH_TIMED,
+                                mBatteryLedOn, mBatteryLedOn);
+                    } else {
+                        // Solid orange when charging and halfway full
+                        mBatteryLight.setColor(mBatteryMediumARGB);
+                    }
                 }
             } else {
                 // No lights if not charging and not low