UsbManager / UsbService / UsbDeviceManager: delete unused code

These functions are never called.

Change-Id: Ic436e1036bed717d2c64701fddd9a810abb9443e

core/java/android/hardware/usb/IUsbManager.aidl

@@ -85,9 +85,6 @@ interface IUsbManager
     /* Sets the current USB function. */
     void setCurrentFunction(String function, boolean makeDefault);
 
-    /* Sets the file path for USB mass storage backing file. */
-    void setMassStorageBackingFile(String path);
-
     /* Allow USB debugging from the attached host. If alwaysAllow is true, add the
      * the public key to list of host keys that the user has approved.
      */

core/java/android/hardware/usb/UsbManager.java

@@ -410,28 +410,6 @@ public class UsbManager {
         }
     }
 
-    private static boolean propertyContainsFunction(String property, String function) {
-        String functions = SystemProperties.get(property, "");
-        int index = functions.indexOf(function);
-        if (index < 0) return false;
-        if (index > 0 && functions.charAt(index - 1) != ',') return false;
-        int charAfter = index + function.length();
-        if (charAfter < functions.length() && functions.charAt(charAfter) != ',') return false;
-        return true;
-    }
-
-    /**
-     * Returns true if the specified USB function is currently enabled.
-     *
-     * @param function name of the USB function
-     * @return true if the USB function is enabled.
-     *
-     * {@hide}
-     */
-    public boolean isFunctionEnabled(String function) {
-        return propertyContainsFunction("sys.usb.config", function);
-    }
-
     /**
      * Returns the current default USB function.
      *
@@ -465,19 +443,4 @@ public class UsbManager {
             Log.e(TAG, "RemoteException in setCurrentFunction", e);
         }
     }
-
-    /**
-     * Sets the file path for USB mass storage backing file.
-     *
-     * @param path backing file path
-     *
-     * {@hide}
-     */
-    public void setMassStorageBackingFile(String path) {
-        try {
-            mService.setMassStorageBackingFile(path);
-        } catch (RemoteException e) {
-            Log.e(TAG, "RemoteException in setDefaultFunction", e);
-        }
-    }
 }

services/usb/java/com/android/server/usb/UsbDeviceManager.java

@@ -78,8 +78,6 @@ public class UsbDeviceManager {
             "/sys/class/android_usb/android0/functions";
     private static final String STATE_PATH =
             "/sys/class/android_usb/android0/state";
-    private static final String MASS_STORAGE_FILE_PATH =
-            "/sys/class/android_usb/android0/f_mass_storage/lun/file";
     private static final String RNDIS_ETH_ADDR_PATH =
             "/sys/class/android_usb/android0/f_rndis/ethaddr";
     private static final String AUDIO_SOURCE_PCM_PATH =
@@ -832,8 +830,6 @@ public class UsbDeviceManager {
                         + FileUtils.readTextFile(new File(STATE_PATH), 0, null).trim());
                 pw.println("    Kernel function list: "
                         + FileUtils.readTextFile(new File(FUNCTIONS_PATH), 0, null).trim());
-                pw.println("    Mass storage backing file: "
-                        + FileUtils.readTextFile(new File(MASS_STORAGE_FILE_PATH), 0, null).trim());
             } catch (IOException e) {
                 pw.println("IOException: " + e);
             }
@@ -866,15 +862,6 @@ public class UsbDeviceManager {
         mHandler.sendMessage(MSG_SET_CURRENT_FUNCTIONS, functions, makeDefault);
     }
 
-    public void setMassStorageBackingFile(String path) {
-        if (path == null) path = "";
-        try {
-            FileUtils.stringToFile(MASS_STORAGE_FILE_PATH, path);
-        } catch (IOException e) {
-           Slog.e(TAG, "failed to write to " + MASS_STORAGE_FILE_PATH);
-        }
-    }
-
     private void readOemUsbOverrideConfig() {
         String[] configList = mContext.getResources().getStringArray(
             com.android.internal.R.array.config_oemUsbModeOverride);

services/usb/java/com/android/server/usb/UsbService.java

@@ -270,16 +270,6 @@ public class UsbService extends IUsbManager.Stub {
         }
     }
 
-    @Override
-    public void setMassStorageBackingFile(String path) {
-        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
-        if (mDeviceManager != null) {
-            mDeviceManager.setMassStorageBackingFile(path);
-        } else {
-            throw new IllegalStateException("USB device mode not supported");
-        }
-    }
-
     @Override
     public void allowUsbDebugging(boolean alwaysAllow, String publicKey) {
         mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);