/* returns true if USB is in accessory mode */
private boolean initFunctions(File dir, boolean useEnableFiles, char[] buffer) {
boolean inAccessoryMode = false;
try {
File[] files = dir.listFiles();
for (int i = 0; i < files.length; i++) {
File file = useEnableFiles ? new File(files[i], "enable") : files[i];
FileReader reader = new FileReader(file);
int len = reader.read(buffer, 0, 1024);
reader.close();
int value = Integer.valueOf((new String(buffer, 0, len)).trim());
String functionName = files[i].getName();
if (value == 1) {
mEnabledFunctions.add(functionName);
if (UsbManager.USB_FUNCTION_ACCESSORY.equals(functionName)) {
// The USB accessory driver is on by default, but it might have been
// enabled before the USB service has initialized.
inAccessoryMode = true;
} else if (!UsbManager.USB_FUNCTION_ADB.equals(functionName)) {
// adb is enabled/disabled automatically by the adbd daemon,
// so don't treat it as a default function.
mDefaultFunctions.add(functionName);
}
} else {
mDisabledFunctions.add(functionName);
}
}
} catch (Exception e) {
Slog.e(TAG, "", e);
}
return inAccessoryMode;
}
private final void init() {
char[] buffer = new char[1024];
boolean inAccessoryMode = false;
// Read initial USB state (device mode)
mConfiguration = -1;
try {
FileReader file = new FileReader(USB_CONNECTED_PATH);
int len = file.read(buffer, 0, 1024);
file.close();
mConnected = Integer.valueOf((new String(buffer, 0, len)).trim());
file = new FileReader(USB_CONFIGURATION_PATH);
len = file.read(buffer, 0, 1024);
file.close();
mConfiguration = Integer.valueOf((new String(buffer, 0, len)).trim());
} catch (FileNotFoundException e) {
Slog.i(TAG, "This kernel does not have USB configuration switch support");
Slog.i(TAG, "Trying legacy USB configuration switch support");
try {
FileReader file = new FileReader(USB_LEGACY_PATH);
int len = file.read(buffer, 0, 1024);
file.close();
mConnected = ("online".equals((new String(buffer, 0, len))) ? 1 : 0);
mLegacy = true;
mConfiguration = 0;
} catch (FileNotFoundException f) {
Slog.i(TAG, "This kernel does not have legacy USB configuration switch support");
} catch (Exception f) {
Slog.e(TAG, "", f);
}
} catch (Exception e) {
Slog.e(TAG, "", e);
}
if (mConfiguration < 0) {
// This may happen in the emulator or devices without USB device mode support
return;
}
if (mLegacy) {
mDisabledFunctions.add(UsbManager.USB_FUNCTION_MASS_STORAGE);
} else {
// Read initial list of enabled and disabled functions (device mode)
try {
File[] files = new File(USB_COMPOSITE_CLASS_PATH).listFiles();
for (int i = 0; i < files.length; i++) {
File file = new File(files[i], "enable");
FileReader reader = new FileReader(file);
int len = reader.read(buffer, 0, 1024);
reader.close();
int value = Integer.valueOf((new String(buffer, 0, len)).trim());
String functionName = files[i].getName();
if (value == 1) {
mEnabledFunctions.add(functionName);
if (UsbManager.USB_FUNCTION_ACCESSORY.equals(functionName)) {
// The USB accessory driver is on by default, but it might have been
// enabled before the USB service has initialized.
inAccessoryMode = true;
} else if (!UsbManager.USB_FUNCTION_ADB.equals(functionName)) {
// adb is enabled/disabled automatically by the adbd daemon,
// so don't treat it as a default function.
mDefaultFunctions.add(functionName);
}
} else {
mDisabledFunctions.add(functionName);
}
}
} catch (FileNotFoundException e) {
Slog.w(TAG, "This kernel does not have USB composite class support");
} catch (Exception e) {
Slog.e(TAG, "", e);
}
}
// handle the case where an accessory switched the driver to accessory mode
// before the framework finished booting
if (inAccessoryMode && !mLegacy) {
readCurrentAccessoryLocked();
// FIXME - if we booted in accessory mode, then we have no way to figure out
// which functions are enabled by default.
// For now, assume that MTP or mass storage are the only possibilities
if (mDisabledFunctions.contains(UsbManager.USB_FUNCTION_MTP)) {
mDefaultFunctions.add(UsbManager.USB_FUNCTION_MTP);
} else if (mDisabledFunctions.contains(UsbManager.USB_FUNCTION_MASS_STORAGE)) {
mDefaultFunctions.add(UsbManager.USB_FUNCTION_MASS_STORAGE);
}
}
}