jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <Kernel/Devices/HID/HIDManagement.h>
8#include <Kernel/Devices/HID/MouseDevice.h>
9
10namespace Kernel {
11
12MouseDevice::MouseDevice()
13 : HIDDevice(10, HIDManagement::the().generate_minor_device_number_for_mouse())
14{
15}
16
17MouseDevice::~MouseDevice() = default;
18
19bool MouseDevice::can_read(OpenFileDescription const&, u64) const
20{
21 SpinlockLocker lock(m_queue_lock);
22 return !m_queue.is_empty();
23}
24
25ErrorOr<size_t> MouseDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
26{
27 VERIFY(size > 0);
28 size_t nread = 0;
29 size_t remaining_space_in_buffer = static_cast<size_t>(size) - nread;
30 SpinlockLocker lock(m_queue_lock);
31 while (!m_queue.is_empty() && remaining_space_in_buffer) {
32 auto packet = m_queue.dequeue();
33 lock.unlock();
34
35 dbgln_if(MOUSE_DEBUG, "Mouse Read: Buttons {:x}", packet.buttons);
36 dbgln_if(MOUSE_DEBUG, "PS2 Mouse: X {}, Y {}, Z {}, W {}, Relative {}", packet.x, packet.y, packet.z, packet.w, packet.buttons);
37 dbgln_if(MOUSE_DEBUG, "PS2 Mouse Read: Filter packets");
38
39 size_t bytes_read_from_packet = min(remaining_space_in_buffer, sizeof(MousePacket));
40 TRY(buffer.write(&packet, nread, bytes_read_from_packet));
41 nread += bytes_read_from_packet;
42 remaining_space_in_buffer -= bytes_read_from_packet;
43
44 lock.lock();
45 }
46 return nread;
47}
48
49}