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Kernel/USB: Fetch configuration descriptors on enumeration

This also introduces a new class, `USBConfiguration` that stores a
configuration. The device, when instructed, sets this configuration and
holds a pointer to it so we have a record of what configuration is
currently active.
This commit is contained in:
Jesse Buhagiar 2022-04-11 20:18:31 +10:00 committed by Andreas Kling
parent 1409a48da6
commit dac26f89cb
3 changed files with 62 additions and 0 deletions

View file

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/*
* Copyright (c) 2022, Jesse Buhagiar <jesse.buhagiar@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Vector.h>
#include <Kernel/Bus/USB/USBDescriptors.h>
#include <Kernel/Bus/USB/USBDevice.h>
namespace Kernel::USB {
class Device;
class USBConfiguration {
public:
USBConfiguration() = delete;
USBConfiguration(Device& device, USBConfigurationDescriptor const configuration_descriptor)
: m_device(device)
, m_descriptor(configuration_descriptor)
{
}
Device const& device() const { return m_device; }
u8 interface_count() const { return m_descriptor.number_of_interfaces; }
u8 configuration_id() const { return m_descriptor.configuration_value; }
u8 attributes() const { return m_descriptor.attributes_bitmap; }
u16 max_power_ma() const { return m_descriptor.max_power_in_ma * 2u; } // Note: "Power" is used incorrectly here, however it's what it's called in the descriptor/documentation
private:
Device& m_device; // Reference to the device linked to this configuration
USBConfigurationDescriptor m_descriptor; // Descriptor that backs this configuration
};
}