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Kernel/USB: Add Hubs and the UHCI Root Hub

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Luke 2021-08-13 20:47:13 +01:00 • committed by Andreas Kling
parent 9dcd146ab4
commit da0a1068e9
11 changed files with 1009 additions and 100 deletions
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107
Kernel/Bus/USB/USBHub.h Normal file
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/*
* Copyright (c) 2021, Luke Wilde <lukew@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/RefCounted.h>
#include <AK/Types.h>
#include <Kernel/Bus/USB/USBDevice.h>
namespace Kernel::USB {
// USB 2.0 Specification Page 421 Table 11-16
enum HubRequest : u8 {
GET_STATUS = 0,
CLEAR_FEATURE = 1,
// 2 is reserved.
SET_FEATURE = 3,
// 4-5 are reserved.
GET_DESCRIPTOR = 6,
SET_DESCRIPTOR = 7,
CLEAR_TT_BUFFER = 8,
RESET_TT = 9,
GET_TT_STATE = 10,
STOP_TT = 11,
};
// USB 2.0 Specification Pages 421-422 Table 11-17
enum HubFeatureSelector : u8 {
C_HUB_LOCAL_POWER = 0,
C_HUB_OVER_CURRENT = 1,
PORT_CONNECTION = 0,
PORT_ENABLE = 1,
PORT_SUSPEND = 2,
PORT_OVER_CURRENT = 3,
PORT_RESET = 4,
PORT_POWER = 8,
PORT_LOW_SPEED = 9,
C_PORT_CONNECTION = 16,
C_PORT_ENABLE = 17,
C_PORT_SUSPEND = 18,
C_PORT_OVER_CURRENT = 19,
C_PORT_RESET = 20,
PORT_TEST = 21,
PORT_INDICATOR = 22,
};
// USB 2.0 Specification Section 11.24.2.{6,7}
// This is used to store both the hub status and port status, as they have the same layout.
struct [[gnu::packed]] HubStatus {
u16 status { 0 };
u16 change { 0 };
};
static_assert(sizeof(HubStatus) == 4);
static constexpr u16 HUB_STATUS_LOCAL_POWER_SOURCE = (1 << 0);
static constexpr u16 HUB_STATUS_OVER_CURRENT = (1 << 1);
static constexpr u16 HUB_STATUS_LOCAL_POWER_SOURCE_CHANGED = (1 << 0);
static constexpr u16 HUB_STATUS_OVER_CURRENT_CHANGED = (1 << 1);
static constexpr u16 PORT_STATUS_CURRENT_CONNECT_STATUS = (1 << 0);
static constexpr u16 PORT_STATUS_PORT_ENABLED = (1 << 1);
static constexpr u16 PORT_STATUS_SUSPEND = (1 << 2);
static constexpr u16 PORT_STATUS_OVER_CURRENT = (1 << 3);
static constexpr u16 PORT_STATUS_RESET = (1 << 4);
static constexpr u16 PORT_STATUS_PORT_POWER = (1 << 8);
static constexpr u16 PORT_STATUS_LOW_SPEED_DEVICE_ATTACHED = (1 << 9);
static constexpr u16 PORT_STATUS_HIGH_SPEED_DEVICE_ATTACHED = (1 << 10);
static constexpr u16 PORT_STATUS_PORT_STATUS_MODE = (1 << 11);
static constexpr u16 PORT_STATUS_PORT_INDICATOR_CONTROL = (1 << 12);
static constexpr u16 PORT_STATUS_CONNECT_STATUS_CHANGED = (1 << 0);
static constexpr u16 PORT_STATUS_PORT_ENABLED_CHANGED = (1 << 1);
static constexpr u16 PORT_STATUS_SUSPEND_CHANGED = (1 << 2);
static constexpr u16 PORT_STATUS_OVER_CURRENT_INDICATOR_CHANGED = (1 << 3);
static constexpr u16 PORT_STATUS_RESET_CHANGED = (1 << 4);
class Hub : public Device {
public:
static KResultOr<NonnullRefPtr<Hub>> try_create_root_hub(NonnullRefPtr<USBController>, DeviceSpeed);
static KResultOr<NonnullRefPtr<Hub>> try_create_from_device(Device const&);
// Root Hub constructor
Hub(NonnullRefPtr<USBController>, DeviceSpeed, NonnullOwnPtr<Pipe> default_pipe);
Hub(Device const&, NonnullOwnPtr<Pipe> default_pipe);
virtual ~Hub() override = default;
KResult enumerate_and_power_on_hub();
KResult get_port_status(u8, HubStatus&);
KResult clear_port_feature(u8, HubFeatureSelector);
KResult set_port_feature(u8, HubFeatureSelector);
KResult reset_port(u8);
void check_for_port_updates();
private:
USBHubDescriptor m_hub_descriptor;
Device::List m_children;
};
}