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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/JsonArraySerializer.h>
#include <AK/JsonObjectSerializer.h>
#include <Kernel/Bus/USB/SysFSUSB.h>
#include <Kernel/KBufferBuilder.h>
namespace Kernel::USB {
static SysFSUSBBusDirectory* s_procfs_usb_bus_directory;
SysFSUSBDeviceInformation::SysFSUSBDeviceInformation(USB::Device& device)
: SysFSComponent(String::number(device.address()))
, m_device(device)
{
}
SysFSUSBDeviceInformation::~SysFSUSBDeviceInformation()
{
}
KResultOr<size_t> SysFSUSBDeviceInformation::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, FileDescription*) const
{
KBufferBuilder builder;
JsonArraySerializer array { builder };
auto obj = array.add_object();
obj.add("usb_spec_compliance_bcd", m_device->device_descriptor().usb_spec_compliance_bcd);
obj.add("device_class", m_device->device_descriptor().device_class);
obj.add("device_sub_class", m_device->device_descriptor().device_sub_class);
obj.add("device_protocol", m_device->device_descriptor().device_protocol);
obj.add("max_packet_size", m_device->device_descriptor().max_packet_size);
obj.add("vendor_id", m_device->device_descriptor().vendor_id);
obj.add("product_id", m_device->device_descriptor().product_id);
obj.add("device_release_bcd", m_device->device_descriptor().device_release_bcd);
obj.add("manufacturer_id_descriptor_index", m_device->device_descriptor().manufacturer_id_descriptor_index);
obj.add("product_string_descriptor_index", m_device->device_descriptor().product_string_descriptor_index);
obj.add("serial_number_descriptor_index", m_device->device_descriptor().serial_number_descriptor_index);
obj.add("num_configurations", m_device->device_descriptor().num_configurations);
obj.finish();
array.finish();
auto data = builder.build();
if (!data)
return ENOMEM;
ssize_t nread = min(static_cast<off_t>(data->size() - offset), static_cast<off_t>(count));
if (!buffer.write(data->data() + offset, nread))
return EFAULT;
return nread;
}
KResult SysFSUSBBusDirectory::traverse_as_directory(unsigned fsid, Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
{
ScopedSpinlock lock(m_lock);
// Note: if the parent directory is null, it means something bad happened as this should not happen for the USB directory.
VERIFY(m_parent_directory);
callback({ ".", { fsid, component_index() }, 0 });
callback({ "..", { fsid, m_parent_directory->component_index() }, 0 });
for (auto& device_node : m_device_nodes) {
InodeIdentifier identifier = { fsid, device_node.component_index() };
callback({ device_node.name(), identifier, 0 });
}
return KSuccess;
}
RefPtr<SysFSComponent> SysFSUSBBusDirectory::lookup(StringView name)
{
ScopedSpinlock lock(m_lock);
for (auto& device_node : m_device_nodes) {
if (device_node.name() == name) {
return device_node;
}
}
return {};
}
RefPtr<SysFSUSBDeviceInformation> SysFSUSBBusDirectory::device_node_for(USB::Device& device)
{
RefPtr<USB::Device> checked_device = device;
for (auto& device_node : m_device_nodes) {
if (device_node.device().ptr() == checked_device.ptr())
return device_node;
}
return {};
}
void SysFSUSBBusDirectory::plug(USB::Device& new_device)
{
ScopedSpinlock lock(m_lock);
auto device_node = device_node_for(new_device);
VERIFY(!device_node);
m_device_nodes.append(SysFSUSBDeviceInformation::create(new_device));
}
void SysFSUSBBusDirectory::unplug(USB::Device& deleted_device)
{
ScopedSpinlock lock(m_lock);
auto device_node = device_node_for(deleted_device);
VERIFY(device_node);
device_node->m_list_node.remove();
}
SysFSUSBBusDirectory& SysFSUSBBusDirectory::the()
{
VERIFY(s_procfs_usb_bus_directory);
return *s_procfs_usb_bus_directory;
}
UNMAP_AFTER_INIT SysFSUSBBusDirectory::SysFSUSBBusDirectory(SysFSBusDirectory& buses_directory)
: SysFSDirectory("usb"sv, buses_directory)
{
}
UNMAP_AFTER_INIT void SysFSUSBBusDirectory::initialize()
{
auto directory = adopt_ref(*new SysFSUSBBusDirectory(SysFSComponentRegistry::the().buses_directory()));
SysFSComponentRegistry::the().register_new_bus_directory(directory);
s_procfs_usb_bus_directory = directory;
}
NonnullRefPtr<SysFSUSBDeviceInformation> SysFSUSBDeviceInformation::create(USB::Device& device)
{
return adopt_ref(*new SysFSUSBDeviceInformation(device));
}
}
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