xref: /aosp_15_r20/hardware/interfaces/tv/cec/1.1/IHdmiCec.hal (revision 4d7e907c777eeecc4c5bd7cf640a754fac206ff7)

/*
 * Copyright (C) 2021 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 [email protected];

import @1.0::IHdmiCec;
import @1.0::Result;
import @1.0::SendMessageResult;

import IHdmiCecCallback;

/**
 * HDMI-CEC HAL interface definition.
 */
interface IHdmiCec extends @1.0::IHdmiCec {
    /**
     * Passes the logical address that must be used in this system.
     *
     * HAL must use it to configure the hardware so that the CEC commands
     * addressed the given logical address can be filtered in. This method must
     * be able to be called as many times as necessary in order to support
     * multiple logical devices.
     *
     * @param addr Logical address that must be used in this system. It must be
     *        in the range of valid logical addresses for the call to succeed.
     * @return result Result status of the operation. SUCCESS if successful,
     *         FAILURE_INVALID_ARGS if the given logical address is invalid,
     *         FAILURE_BUSY if device or resource is busy
     */
    addLogicalAddress_1_1(CecLogicalAddress addr) generates (Result result);

    /**
     * Transmits HDMI-CEC message to other HDMI device.
     *
     * The method must be designed to return in a certain amount of time and not
     * hanging forever which may happen if CEC signal line is pulled low for
     * some reason.
     *
     * It must try retransmission at least once as specified in the section '7.1
     * Frame Re-transmissions' of the CEC Spec 1.4b.
     *
     * @param message CEC message to be sent to other HDMI device.
     * @return result Result status of the operation. SUCCESS if successful,
     *         NACK if the sent message is not acknowledged,
     *         BUSY if the CEC bus is busy.
     */
    sendMessage_1_1(CecMessage message) generates (SendMessageResult result);

    /**
     * Sets a callback that HDMI-CEC HAL must later use for incoming CEC
     * messages or internal HDMI events.
     *
     * @param callback Callback object to pass hdmi events to the system. The
     *        previously registered callback must be replaced with this one.
     */
    setCallback_1_1(IHdmiCecCallback callback);
};