Kernel/USB: Move the USB components as a subfolder to the Bus directory

Kernel/Bus/USB/USBPipe.h

@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/OwnPtr.h>
+#include <AK/Types.h>
+#include <Kernel/Bus/USB/USBDescriptors.h>
+#include <Kernel/VM/Region.h>
+
+namespace Kernel::USB {
+
+//
+// A pipe is the logical connection between a memory buffer on the PC (host) and
+// an endpoint on the device. In this implementation, the data buffer the pipe connects
+// to is the physical buffer created when a Transfer is allocated.
+//
+class Pipe {
+public:
+    enum class Type : u8 {
+        Control = 0,
+        Isochronous = 1,
+        Bulk = 2,
+        Interrupt = 3
+    };
+
+    enum class Direction : u8 {
+        Out = 0,
+        In = 1,
+        Bidirectional = 2
+    };
+
+    enum class DeviceSpeed : u8 {
+        LowSpeed,
+        FullSpeed
+    };
+
+public:
+    static KResultOr<NonnullOwnPtr<Pipe>> try_create_pipe(Type type, Direction direction, u8 endpoint_address, u16 max_packet_size, i8 device_address, u8 poll_interval = 0);
+
+    Type type() const { return m_type; }
+    Direction direction() const { return m_direction; }
+    DeviceSpeed device_speed() const { return m_speed; }
+
+    i8 device_address() const { return m_device_address; }
+    u8 endpoint_address() const { return m_endpoint_address; }
+    u16 max_packet_size() const { return m_max_packet_size; }
+    u8 poll_interval() const { return m_poll_interval; }
+    bool data_toggle() const { return m_data_toggle; }
+
+    void set_max_packet_size(u16 max_size) { m_max_packet_size = max_size; }
+    void set_toggle(bool toggle) { m_data_toggle = toggle; }
+    void set_device_address(i8 addr) { m_device_address = addr; }
+
+    KResultOr<size_t> control_transfer(u8 request_type, u8 request, u16 value, u16 index, u16 length, void* data);
+
+    Pipe(Type type, Direction direction, u16 max_packet_size);
+    Pipe(Type type, Direction direction, USBEndpointDescriptor& endpoint);
+    Pipe(Type type, Direction direction, u8 endpoint_address, u16 max_packet_size, u8 poll_interval, i8 device_address);
+
+private:
+    friend class Device;
+
+    Type m_type;
+    Direction m_direction;
+    DeviceSpeed m_speed;
+
+    i8 m_device_address { 0 };    // Device address of this pipe
+    u8 m_endpoint_address { 0 };  // Corresponding endpoint address for this pipe
+    u16 m_max_packet_size { 0 };  // Max packet size for this pipe
+    u8 m_poll_interval { 0 };     // Polling interval (in frames)
+    bool m_data_toggle { false }; // Data toggle for stuffing bit
+};
+}