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872c75ac44
This makes it controller agnostic and allows us to access it from the USB hub code. The copyright says "Liav A." because git blame says he wrote this.
127 lines
4.4 KiB
C++
127 lines
4.4 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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#include <AK/JsonArraySerializer.h>
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#include <AK/JsonObjectSerializer.h>
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#include <Kernel/Bus/USB/SysFSUSB.h>
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#include <Kernel/KBufferBuilder.h>
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namespace Kernel::USB {
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static SysFSUSBBusDirectory* s_procfs_usb_bus_directory;
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SysFSUSBDeviceInformation::SysFSUSBDeviceInformation(USB::Device& device)
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: SysFSComponent(String::number(device.address()))
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, m_device(device)
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{
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}
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SysFSUSBDeviceInformation::~SysFSUSBDeviceInformation()
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{
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}
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KResultOr<size_t> SysFSUSBDeviceInformation::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, FileDescription*) const
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{
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KBufferBuilder builder;
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JsonArraySerializer array { builder };
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auto obj = array.add_object();
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obj.add("usb_spec_compliance_bcd", m_device->device_descriptor().usb_spec_compliance_bcd);
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obj.add("device_class", m_device->device_descriptor().device_class);
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obj.add("device_sub_class", m_device->device_descriptor().device_sub_class);
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obj.add("device_protocol", m_device->device_descriptor().device_protocol);
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obj.add("max_packet_size", m_device->device_descriptor().max_packet_size);
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obj.add("vendor_id", m_device->device_descriptor().vendor_id);
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obj.add("product_id", m_device->device_descriptor().product_id);
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obj.add("device_release_bcd", m_device->device_descriptor().device_release_bcd);
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obj.add("manufacturer_id_descriptor_index", m_device->device_descriptor().manufacturer_id_descriptor_index);
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obj.add("product_string_descriptor_index", m_device->device_descriptor().product_string_descriptor_index);
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obj.add("serial_number_descriptor_index", m_device->device_descriptor().serial_number_descriptor_index);
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obj.add("num_configurations", m_device->device_descriptor().num_configurations);
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obj.finish();
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array.finish();
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auto data = builder.build();
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if (!data)
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return ENOMEM;
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ssize_t nread = min(static_cast<off_t>(data->size() - offset), static_cast<off_t>(count));
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if (!buffer.write(data->data() + offset, nread))
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return EFAULT;
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return nread;
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}
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KResult SysFSUSBBusDirectory::traverse_as_directory(unsigned fsid, Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
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{
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ScopedSpinLock lock(m_lock);
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// Note: if the parent directory is null, it means something bad happened as this should not happen for the USB directory.
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VERIFY(m_parent_directory);
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callback({ ".", { fsid, component_index() }, 0 });
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callback({ "..", { fsid, m_parent_directory->component_index() }, 0 });
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for (auto& device_node : m_device_nodes) {
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InodeIdentifier identifier = { fsid, device_node.component_index() };
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callback({ device_node.name(), identifier, 0 });
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}
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return KSuccess;
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}
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RefPtr<SysFSComponent> SysFSUSBBusDirectory::lookup(StringView name)
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{
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ScopedSpinLock lock(m_lock);
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for (auto& device_node : m_device_nodes) {
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if (device_node.name() == name) {
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return device_node;
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}
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}
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return {};
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}
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RefPtr<SysFSUSBDeviceInformation> SysFSUSBBusDirectory::device_node_for(USB::Device& device)
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{
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RefPtr<USB::Device> checked_device = device;
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for (auto& device_node : m_device_nodes) {
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if (device_node.device().ptr() == checked_device.ptr())
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return device_node;
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}
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return {};
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}
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void SysFSUSBBusDirectory::plug(USB::Device& new_device)
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{
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ScopedSpinLock lock(m_lock);
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auto device_node = device_node_for(new_device);
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VERIFY(!device_node);
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m_device_nodes.append(SysFSUSBDeviceInformation::create(new_device));
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}
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void SysFSUSBBusDirectory::unplug(USB::Device& deleted_device)
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{
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ScopedSpinLock lock(m_lock);
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auto device_node = device_node_for(deleted_device);
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VERIFY(device_node);
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device_node->m_list_node.remove();
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}
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UNMAP_AFTER_INIT SysFSUSBBusDirectory::SysFSUSBBusDirectory(SysFSBusDirectory& buses_directory)
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: SysFSDirectory("usb"sv, buses_directory)
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{
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}
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UNMAP_AFTER_INIT void SysFSUSBBusDirectory::initialize()
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{
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auto directory = adopt_ref(*new SysFSUSBBusDirectory(SysFSComponentRegistry::the().buses_directory()));
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SysFSComponentRegistry::the().register_new_bus_directory(directory);
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s_procfs_usb_bus_directory = directory;
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}
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NonnullRefPtr<SysFSUSBDeviceInformation> SysFSUSBDeviceInformation::create(USB::Device& device)
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{
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return adopt_ref(*new SysFSUSBDeviceInformation(device));
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}
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}
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