system/hwc3/DrmConnector.h

/*
 * Copyright 2022 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.
 */

#pragma once

#include <android-base/logging.h>
#include <android-base/unique_fd.h>
#include <xf86drm.h>
#include <xf86drmMode.h>

#include <cstdint>
#include <memory>
#include <optional>
#include <string>
#include <unordered_map>

#include "Common.h"
#include "DrmMode.h"
#include "DrmProperty.h"
#include "EdidInfo.h"

namespace aidl::android::hardware::graphics::composer3::impl {

// A "cable" to the display (HDMI, DisplayPort, etc).
class DrmConnector {
   public:
    static std::unique_ptr<DrmConnector> create(::android::base::borrowed_fd drmFd,
                                                uint32_t connectorId);
    ~DrmConnector(){};

    uint32_t getId() const { return mId; }

    uint32_t getWidth() const;
    uint32_t getHeight() const;

    uint32_t getDpiX() const;
    uint32_t getDpiY() const;

    float getRefreshRate() const;
    uint32_t getRefreshRateUint() const { return (uint32_t)(getRefreshRate() + 0.5f); }

    bool isConnected() const { return mStatus == DRM_MODE_CONNECTED; }

    std::optional<std::vector<uint8_t>> getEdid() const { return mEdid; }

    const DrmProperty& getCrtcProperty() const { return mCrtc; }
    const DrmMode* getDefaultMode() const { return mModes[0].get(); }

    bool update(::android::base::borrowed_fd drmFd);

   private:
    DrmConnector(uint32_t id) : mId(id) {}

    std::optional<EdidInfo> loadEdid(::android::base::borrowed_fd drmFd);

    const uint32_t mId;

    drmModeConnection mStatus = DRM_MODE_UNKNOWNCONNECTION;
    std::optional<uint32_t> mWidthMillimeters;
    std::optional<uint32_t> mHeightMillimeters;
    std::vector<std::unique_ptr<DrmMode>> mModes;

    DrmProperty mCrtc;
    DrmProperty mEdidProp;
    std::optional<std::vector<uint8_t>> mEdid;

    static const auto& GetPropertiesMap() {
        static const auto* sMap = []() {
            return new DrmPropertyMemberMap<DrmConnector>{
                {"CRTC_ID", &DrmConnector::mCrtc},
                {"EDID", &DrmConnector::mEdidProp},
            };
        }();
        return *sMap;
    }
};

}  // namespace aidl::android::hardware::graphics::composer3::impl