tslib: Selected device is not a touchscreen (must support ABS_X and ABS_Y events)

/************************************************************************************
 * tslib: Selected device is not a touchscreen (must support ABS_X and ABS_Y events)
 * 说明：
 *     tslib校正的时候遇到这个问题，需要修改驱动里设备的支持的属性来解决。
 *
 *                                            2017-5-25 * 中和区 曾剑锋
 ***********************************************************************************/

一、参考文档：
    . Touchscreen and Driver Installed but tslib Cannot Calibrate
        https://*.com/questions/11937287/touchscreen-and-driver-installed-but-tslib-cannot-calibrate

二、具体操作：
    static int xxxxx_spi_probe(struct spi_device *client)
    {
        ...
        __set_bit(EV_KEY, input_dev->evbit);
        __set_bit(EV_ABS, input_dev->evbit);
        __set_bit(BTN_TOUCH, input_dev->keybit);
        __set_bit(INPUT_PROP_DIRECT, input_dev->propbit);

        __set_bit(ABS_X, input_dev->absbit);                    // fix
        __set_bit(ABS_Y, input_dev->absbit);                    // fix
        ...
    }