输入系统框架 -- 输入设备配置文件（idc文件）

平台	内核版本
输入系统框架	输入设备配置文件（idc文件）

输入设备配置文件（idc文件）

文件目录：frameworks/native/services/inputflinger/EventHub.cpp

status_t EventHub::openDeviceLocked(const char *devicePath) {

    int fd = open(devicePath, O_RDWR | O_CLOEXEC);
	
	// Get device name
    ioctl(fd, EVIOCGNAME(sizeof(buffer) - 1), &buffer);
    
    // Get device driver version.
    ioctl(fd, EVIOCGVERSION, &driverVersion);

    //Get device identifier.
    ioctl(fd, EVIOCGID, &inputId);

    // Get device physical location.
    ioctl(fd, EVIOCGPHYS(sizeof(buffer) - 1), &buffer)
    
    // Get device unique id.
    ioctl(fd, EVIOCGUNIQ(sizeof(buffer)
    
    // Allocate device.  (The device object takes ownership of the fd at this point.)
    int32_t deviceId = mNextDeviceId++;

    // Load the configuration file for the device.
    loadConfigurationLocked(device);

}

代码通过loadConfigurationLocked来加载kl/kcm文件

void EventHub::loadConfigurationLocked(Device* device) {
    //对应 Deivce的成员String8 configurationFile
    device->configurationFile = getInputDeviceConfigurationFilePathByDeviceIdentifier(
            device->identifier, INPUT_DEVICE_CONFIGURATION_FILE_TYPE_CONFIGURATION);
    if (device->configurationFile.isEmpty()) {
        ALOGD("No input device configuration file found for device '%s'.",
                device->identifier.name.string());
    } else {
	    //对应Device的成员PropertyMap* configuration
        status_t status = PropertyMap::load(device->configurationFile,
                &device->configuration);
        if (status) {
            ALOGE("Error loading input device configuration file for device '%s'.  "
                    "Using default configuration.",
                    device->identifier.name.string());
        }
    }
}