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https://github.com/SerenityOS/serenity
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8a0a3638f0
This device will be used by userspace to read mouse packets from all mouse devices that are attached to the machine. This change is a preparation before we can enable seamless hotplug capabilities in WindowServer for mouse devices, without any major change on the userspace side.
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
/*
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* Copyright (c) 2023, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/HID/AllMiceDevice.h>
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#include <Kernel/Devices/HID/Management.h>
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namespace Kernel {
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NonnullRefPtr<AllMiceDevice> AllMiceDevice::must_create()
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{
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return *MUST(DeviceManagement::try_create_device<AllMiceDevice>());
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}
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AllMiceDevice::AllMiceDevice()
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: CharacterDevice(12, 0)
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{
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}
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void AllMiceDevice::enqueue_mouse_packet(MousePacket packet)
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{
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{
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SpinlockLocker lock(m_queue_lock);
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m_queue.enqueue(packet);
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}
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evaluate_block_conditions();
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}
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AllMiceDevice::~AllMiceDevice() = default;
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bool AllMiceDevice::can_read(OpenFileDescription const&, u64) const
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{
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SpinlockLocker lock(m_queue_lock);
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return !m_queue.is_empty();
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}
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ErrorOr<size_t> AllMiceDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
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{
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VERIFY(size > 0);
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size_t nread = 0;
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size_t remaining_space_in_buffer = static_cast<size_t>(size) - nread;
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SpinlockLocker lock(m_queue_lock);
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while (!m_queue.is_empty() && remaining_space_in_buffer) {
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auto packet = m_queue.dequeue();
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size_t bytes_read_from_packet = min(remaining_space_in_buffer, sizeof(MousePacket));
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TRY(buffer.write(&packet, nread, bytes_read_from_packet));
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nread += bytes_read_from_packet;
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remaining_space_in_buffer -= bytes_read_from_packet;
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}
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return nread;
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}
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}
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