public void connectSimulatedPort(
String portId,
int mode,
boolean canChangeMode,
int powerRole,
boolean canChangePowerRole,
int dataRole,
boolean canChangeDataRole,
IndentingPrintWriter pw) {
synchronized (mLock) {
final SimulatedPortInfo portInfo = mSimulatedPorts.get(portId);
if (portInfo == null) {
pw.println("Cannot connect simulated port which does not exist.");
return;
}
if (mode == 0 || powerRole == 0 || dataRole == 0) {
pw.println("Cannot connect simulated port in null mode, " + "power role, or data role.");
return;
}
if ((portInfo.mSupportedModes & mode) == 0) {
pw.println("Simulated port does not support mode: " + UsbPort.modeToString(mode));
return;
}
pw.println(
"Connecting simulated port: portId="
+ portId
+ ", mode="
+ UsbPort.modeToString(mode)
+ ", canChangeMode="
+ canChangeMode
+ ", powerRole="
+ UsbPort.powerRoleToString(powerRole)
+ ", canChangePowerRole="
+ canChangePowerRole
+ ", dataRole="
+ UsbPort.dataRoleToString(dataRole)
+ ", canChangeDataRole="
+ canChangeDataRole);
portInfo.mCurrentMode = mode;
portInfo.mCanChangeMode = canChangeMode;
portInfo.mCurrentPowerRole = powerRole;
portInfo.mCanChangePowerRole = canChangePowerRole;
portInfo.mCurrentDataRole = dataRole;
portInfo.mCanChangeDataRole = canChangeDataRole;
updatePortsLocked(pw);
}
}
public void setPortRoles(
String portId, int newPowerRole, int newDataRole, IndentingPrintWriter pw) {
synchronized (mLock) {
final PortInfo portInfo = mPorts.get(portId);
if (portInfo == null) {
if (pw != null) {
pw.println("No such USB port: " + portId);
}
return;
}
// Check whether the new role is actually supported.
if (!portInfo.mUsbPortStatus.isRoleCombinationSupported(newPowerRole, newDataRole)) {
logAndPrint(
Log.ERROR,
pw,
"Attempted to set USB port into unsupported "
+ "role combination: portId="
+ portId
+ ", newPowerRole="
+ UsbPort.powerRoleToString(newPowerRole)
+ ", newDataRole="
+ UsbPort.dataRoleToString(newDataRole));
return;
}
// Check whether anything actually changed.
final int currentDataRole = portInfo.mUsbPortStatus.getCurrentDataRole();
final int currentPowerRole = portInfo.mUsbPortStatus.getCurrentPowerRole();
if (currentDataRole == newDataRole && currentPowerRole == newPowerRole) {
if (pw != null) {
pw.println("No change.");
}
return;
}
// Determine whether we need to change the mode in order to accomplish this goal.
// We prefer not to do this since it's more likely to fail.
//
// Note: Arguably it might be worth allowing the client to influence this policy
// decision so that we could show more powerful developer facing UI but let's
// see how far we can get without having to do that.
final boolean canChangeMode = portInfo.mCanChangeMode;
final boolean canChangePowerRole = portInfo.mCanChangePowerRole;
final boolean canChangeDataRole = portInfo.mCanChangeDataRole;
final int currentMode = portInfo.mUsbPortStatus.getCurrentMode();
final int newMode;
if ((!canChangePowerRole && currentPowerRole != newPowerRole)
|| (!canChangeDataRole && currentDataRole != newDataRole)) {
if (canChangeMode
&& newPowerRole == UsbPort.POWER_ROLE_SOURCE
&& newDataRole == UsbPort.DATA_ROLE_HOST) {
newMode = UsbPort.MODE_DFP;
} else if (canChangeMode
&& newPowerRole == UsbPort.POWER_ROLE_SINK
&& newDataRole == UsbPort.DATA_ROLE_DEVICE) {
newMode = UsbPort.MODE_UFP;
} else {
logAndPrint(
Log.ERROR,
pw,
"Found mismatch in supported USB role combinations "
+ "while attempting to change role: "
+ portInfo
+ ", newPowerRole="
+ UsbPort.powerRoleToString(newPowerRole)
+ ", newDataRole="
+ UsbPort.dataRoleToString(newDataRole));
return;
}
} else {
newMode = currentMode;
}
// Make it happen.
logAndPrint(
Log.INFO,
pw,
"Setting USB port mode and role: portId="
+ portId
+ ", currentMode="
+ UsbPort.modeToString(currentMode)
+ ", currentPowerRole="
+ UsbPort.powerRoleToString(currentPowerRole)
+ ", currentDataRole="
+ UsbPort.dataRoleToString(currentDataRole)
+ ", newMode="
+ UsbPort.modeToString(newMode)
+ ", newPowerRole="
+ UsbPort.powerRoleToString(newPowerRole)
+ ", newDataRole="
+ UsbPort.dataRoleToString(newDataRole));
SimulatedPortInfo sim = mSimulatedPorts.get(portId);
if (sim != null) {
// Change simulated state.
sim.mCurrentMode = newMode;
sim.mCurrentPowerRole = newPowerRole;
sim.mCurrentDataRole = newDataRole;
} else if (mHaveKernelSupport) {
// Change actual state.
final File portDir = new File(SYSFS_CLASS, portId);
if (!portDir.exists()) {
logAndPrint(Log.ERROR, pw, "USB port not found: portId=" + portId);
return;
}
if (currentMode != newMode) {
// Changing the mode will have the side-effect of also changing
// the power and data roles but it might take some time to apply
// and the renegotiation might fail. Due to limitations of the USB
// hardware, we have no way of knowing whether it will work apriori
// which is why we would prefer to set the power and data roles
// directly instead.
if (!writeFile(
portDir,
SYSFS_PORT_MODE,
newMode == UsbPort.MODE_DFP ? PORT_MODE_DFP : PORT_MODE_UFP)) {
logAndPrint(
Log.ERROR,
pw,
"Failed to set the USB port mode: "
+ "portId="
+ portId
+ ", newMode="
+ UsbPort.modeToString(newMode));
return;
}
} else {
// Change power and data role independently as needed.
if (currentPowerRole != newPowerRole) {
if (!writeFile(
portDir,
SYSFS_PORT_POWER_ROLE,
newPowerRole == UsbPort.POWER_ROLE_SOURCE
? PORT_POWER_ROLE_SOURCE
: PORT_POWER_ROLE_SINK)) {
logAndPrint(
Log.ERROR,
pw,
"Failed to set the USB port power role: "
+ "portId="
+ portId
+ ", newPowerRole="
+ UsbPort.powerRoleToString(newPowerRole));
return;
}
}
if (currentDataRole != newDataRole) {
if (!writeFile(
portDir,
SYSFS_PORT_DATA_ROLE,
newDataRole == UsbPort.DATA_ROLE_HOST
? PORT_DATA_ROLE_HOST
: PORT_DATA_ROLE_DEVICE)) {
logAndPrint(
Log.ERROR,
pw,
"Failed to set the USB port data role: "
+ "portId="
+ portId
+ ", newDataRole="
+ UsbPort.dataRoleToString(newDataRole));
return;
}
}
}
}
updatePortsLocked(pw);
}
}