/*
 * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <Kernel/Devices/HID/VMWareMouseDevice.h>
#include <Kernel/Devices/VMWareBackdoor.h>

namespace Kernel {

UNMAP_AFTER_INIT RefPtr<VMWareMouseDevice> VMWareMouseDevice::try_to_initialize(const I8042Controller& ps2_controller)
{
    if (!VMWareBackdoor::the())
        return {};
    if (!VMWareBackdoor::the()->vmmouse_is_absolute())
        return {};
    auto device = adopt(*new VMWareMouseDevice(ps2_controller));
    if (device->initialize())
        return device;
    return {};
}

void VMWareMouseDevice::irq_handle_byte_read(u8)
{
    VERIFY(VMWareBackdoor::the());
    VERIFY(VMWareBackdoor::the()->vmmouse_is_absolute());
    // We won't receive complete packets with the backdoor enabled,
    // we will only get one byte for each event, which we'll just
    // discard. If we were to wait until we *think* that we got a
    // full PS/2 packet then we would create a backlog in the VM
    // because we wouldn't read the appropriate number of mouse
    // packets from VMWareBackdoor.
    auto mouse_packet = VMWareBackdoor::the()->receive_mouse_packet();
    if (mouse_packet.has_value()) {
        m_entropy_source.add_random_event(mouse_packet.value());
        {
            ScopedSpinLock lock(m_queue_lock);
            m_queue.enqueue(mouse_packet.value());
        }
        evaluate_block_conditions();
    }
    return;
}

VMWareMouseDevice::VMWareMouseDevice(const I8042Controller& ps2_controller)
    : PS2MouseDevice(ps2_controller)
{
}
VMWareMouseDevice::~VMWareMouseDevice()
{
}

}