1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.server.hdmi; 18 19 /** 20 * Class that holds together the constants that may require per-product configuration. 21 */ 22 final class HdmiConfig { 23 24 // Default timeout for the incoming command to arrive in response to a request. 25 static final int TIMEOUT_MS = 2000; 26 27 // IRT(Initiator Repetition Time) in millisecond as recommended in the standard. 28 // Outgoing UCP commands, when in 'Press and Hold' mode, should be this much apart 29 // from the adjacent one so as not to place unnecessarily heavy load on the CEC line. 30 static final int IRT_MS = 300; 31 32 // Number of retries for polling each device in device discovery phase after TV powers on 33 // or HDMI control is enabled. 34 static final int DEVICE_POLLING_RETRY = 1; 35 36 // Number of retries for polling each device in periodic check (hotplug detection). 37 static final int HOTPLUG_DETECTION_RETRY = 1; 38 39 // Number of retries for polling each device in address allocation mechanism. 40 static final int ADDRESS_ALLOCATION_RETRY = 3; 41 42 // Number of retries for sendCommand in actions related to new device discovery. 43 // Number 5 comes from 10 seconds for Chromecast preparation time. 44 static final int TIMEOUT_RETRY = 5; 45 46 // CEC spec said that it should try retransmission at least once. 47 // The actual number of send request for a single command will be at most 48 // RETRANSMISSION_COUNT + 1. Note that it affects only to normal commands 49 // and polling message for logical address allocation and device discovery 50 // action. They will have their own retransmission count. 51 static final int RETRANSMISSION_COUNT = 1; 52 53 // Do not export the CEC devices connected to a legacy HDMI switch. The usage of legacy 54 // (non-CEC) switches is deprecated. They stop the correct operation of many mandatory 55 // CEC features. If set to true, do not pass the list of CEC devices behind the legacy 56 // switch since they won't be under control from TV. 57 static final boolean HIDE_DEVICES_BEHIND_LEGACY_SWITCH = true; 58 59 private HdmiConfig() { /* cannot be instantiated */ } 60 } 61
