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https://github.com/RGBCube/serenity
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7c0540a229
This has KString, KBuffer, DoubleBuffer, KBufferBuilder, IOWindow, UserOrKernelBuffer and ScopedCritical classes being moved to the Kernel/Library subdirectory. Also, move the panic and assertions handling code to that directory.
78 lines
4.1 KiB
C++
78 lines
4.1 KiB
C++
/*
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* Copyright (c) 2022, Jesse Buhagiar <jesse.buhagiar@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/FixedArray.h>
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#include <Kernel/Bus/USB/USBClasses.h>
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#include <Kernel/Bus/USB/USBConfiguration.h>
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#include <Kernel/Bus/USB/USBInterface.h>
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#include <Kernel/Bus/USB/USBRequest.h>
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#include <Kernel/Library/StdLib.h>
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namespace Kernel::USB {
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ErrorOr<void> USBConfiguration::enumerate_interfaces()
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{
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auto descriptor_hierarchy_buffer = TRY(FixedArray<u8>::create(m_descriptor.total_length)); // Buffer for us to store the entire hierarchy into
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// The USB spec is a little bit janky here... Interface and Endpoint descriptors aren't fetched
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// through a `GET_DESCRIPTOR` request to the device. Instead, the _entire_ hierarchy is returned
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// to us in one go.
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auto transfer_length = TRY(m_device.control_transfer(USB_REQUEST_TRANSFER_DIRECTION_DEVICE_TO_HOST, USB_REQUEST_GET_DESCRIPTOR, (DESCRIPTOR_TYPE_CONFIGURATION << 8), 0, m_descriptor.total_length, descriptor_hierarchy_buffer.data()));
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// FIXME: Why does transfer length return the actual size +8 bytes?
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if (transfer_length < m_descriptor.total_length)
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return EIO;
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u8* interface_descriptors_base = descriptor_hierarchy_buffer.data() + sizeof(USBConfigurationDescriptor);
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USBInterfaceDescriptor* interface_descriptor = reinterpret_cast<USBInterfaceDescriptor*>(interface_descriptors_base);
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Vector<USBEndpointDescriptor> endpoint_descriptors;
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for (auto interface = 0u; interface < m_descriptor.number_of_interfaces; interface++) {
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endpoint_descriptors.ensure_capacity(interface_descriptor->number_of_endpoints);
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if constexpr (USB_DEBUG) {
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dbgln("Interface Descriptor {}", interface);
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dbgln("interface_id: {:02x}", interface_descriptor->interface_id);
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dbgln("alternate_setting: {:02x}", interface_descriptor->alternate_setting);
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dbgln("number_of_endpoints: {:02x}", interface_descriptor->number_of_endpoints);
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dbgln("interface_class_code: {:02x}", interface_descriptor->interface_class_code);
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dbgln("interface_sub_class_code: {:02x}", interface_descriptor->interface_sub_class_code);
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dbgln("interface_protocol: {:02x}", interface_descriptor->interface_protocol);
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dbgln("interface_string_descriptor_index: {}", interface_descriptor->interface_string_descriptor_index);
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}
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// Get all the endpoint descriptors
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for (auto endpoint = 0u; endpoint < interface_descriptor->number_of_endpoints; endpoint++) {
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u8* raw_endpoint_descriptor_offset = interface_descriptors_base + sizeof(USBInterfaceDescriptor) + (endpoint * sizeof(USBEndpointDescriptor));
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// FIXME: It looks like HID descriptors come BEFORE the endpoint descriptors for a HID device, so we should load
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// these too eventually.
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// See here: https://www.usb.org/defined-class-codes
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if (interface_descriptor->interface_class_code == USB_CLASS_HID)
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raw_endpoint_descriptor_offset += sizeof(USBHIDDescriptor); // Skip the HID descriptor (this was worked out via buffer inspection)
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USBEndpointDescriptor endpoint_descriptor;
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memcpy(&endpoint_descriptor, raw_endpoint_descriptor_offset, sizeof(USBEndpointDescriptor));
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if constexpr (USB_DEBUG) {
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dbgln("Endpoint Descriptor {}", endpoint);
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dbgln("Endpoint Address: {}", endpoint_descriptor.endpoint_address);
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dbgln("Endpoint Attribute Bitmap: {:08b}", endpoint_descriptor.endpoint_attributes_bitmap);
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dbgln("Endpoint Maximum Packet Size: {}", endpoint_descriptor.max_packet_size);
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dbgln("Endpoint Poll Interval (in frames): {}", endpoint_descriptor.poll_interval_in_frames);
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}
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endpoint_descriptors.append(endpoint_descriptor);
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}
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USBInterface device_interface(*this, *interface_descriptor, endpoint_descriptors);
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m_interfaces.append(device_interface);
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interface_descriptor += interface_descriptor->number_of_endpoints * sizeof(USBEndpointDescriptor);
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}
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return {};
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}
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}
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