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Kernel/HID: Introduce the all-mice device

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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.
This commit is contained in:
Liav A 2023-10-06 21:59:39 +03:00 • committed by Andrew Kaster
parent 75183402fd
commit 8a0a3638f0
6 changed files with 111 additions and 0 deletions
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40
Kernel/Devices/HID/AllMiceDevice.h Normal file
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/*
* Copyright (c) 2023, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/CircularQueue.h>
#include <AK/Types.h>
#include <Kernel/API/MousePacket.h>
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/Security/Random.h>
namespace Kernel {
class AllMiceDevice final : public CharacterDevice {
friend class DeviceManagement;
public:
static NonnullRefPtr<AllMiceDevice> must_create();
virtual ~AllMiceDevice() override;
void enqueue_mouse_packet(MousePacket packet);
private:
AllMiceDevice();
// ^CharacterDevice
virtual StringView class_name() const override { return "AllMiceDevice"sv; }
virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual bool can_read(OpenFileDescription const&, u64) const override;
virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override { return EINVAL; }
virtual bool can_write(OpenFileDescription const&, u64) const override { return true; }
mutable Spinlock<LockRank::None> m_queue_lock {};
CircularQueue<MousePacket, 1000> m_queue;
};
}