platform_hardware_interfaces/usb/1.0/IUsb.hal

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.hardware.usb@1.0;

import IUsbCallback;

interface IUsb {
    /**
     * This function is used to change the port role of a specific port.
     * For example, when PD_SWAP or PR_SWAP is supported.
     * This is function is asynchronous. The status of the role switch
     * will be informed through IUsbCallback object's notifyPortStatusChange
     * method.
     *
     * @param portName name of the port for which the role has to be changed
     * @param role the new port role.
     */
    oneway switchRole(string portName, PortRole role);

    /**
     * This function is used to register a callback function which is
     * called by the HAL whenever there is a change in the port state.
     * i.e. DATA_ROLE, POWER_ROLE or MODE.
     *
     * Also the same callback object would be called to inform the caller
     * of the roleSwitch status.
     *
     * @param callback IUsbCallback object used to convey status to the
     * userspace.
     */
    oneway setCallback(IUsbCallback callback);

    /**
     * This functions is used to request the hal for the current status
     * status of the Type-C ports. This method is async/oneway. The result of the
     * query would be sent through the IUsbCallback object's notifyRoleSwitchStatus
     * to the caller. This api would would let the caller know of the number
     * of type-c ports that are present and their connection status through the
     * PortStatus type.
     */
    oneway queryPortStatus();
};