mirror of
https://github.com/RGBCube/serenity
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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
/*
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* Copyright (c) 2021, 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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#pragma once
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#include <Kernel/Bus/USB/USBDevice.h>
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#include <Kernel/FileSystem/SysFS.h>
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#include <Kernel/KBufferBuilder.h>
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#include <Kernel/Locking/Mutex.h>
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namespace Kernel::USB {
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class SysFSUSBDeviceInformation : public SysFSComponent {
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friend class SysFSUSBBusDirectory;
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public:
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virtual ~SysFSUSBDeviceInformation() override;
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static NonnullRefPtr<SysFSUSBDeviceInformation> create(USB::Device&);
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RefPtr<USB::Device> device() const { return m_device; }
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protected:
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explicit SysFSUSBDeviceInformation(USB::Device& device);
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virtual ErrorOr<size_t> read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
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IntrusiveListNode<SysFSUSBDeviceInformation, RefPtr<SysFSUSBDeviceInformation>> m_list_node;
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NonnullRefPtr<USB::Device> m_device;
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private:
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ErrorOr<void> try_generate(KBufferBuilder&);
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virtual ErrorOr<void> refresh_data(OpenFileDescription& description) const override;
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mutable Mutex m_lock { "SysFSUSBDeviceInformation" };
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};
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class SysFSUSBBusDirectory final : public SysFSDirectory {
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public:
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static void initialize();
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static SysFSUSBBusDirectory& the();
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void plug(USB::Device&);
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void unplug(USB::Device&);
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virtual ErrorOr<void> traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
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virtual RefPtr<SysFSComponent> lookup(StringView name) override;
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private:
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explicit SysFSUSBBusDirectory(SysFSBusDirectory&);
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RefPtr<SysFSUSBDeviceInformation> device_node_for(USB::Device& device);
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IntrusiveList<&SysFSUSBDeviceInformation::m_list_node> m_device_nodes;
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mutable Spinlock m_lock;
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};
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}
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