Kernel: Move devices into Kernel/Devices/.

Kernel/Devices/Device.h

@@ -0,0 +1,51 @@
+#pragma once
+
+#include <AK/Retainable.h>
+#include <AK/Types.h>
+#include "Limits.h"
+#include "FileDescriptor.h"
+
+class Process;
+
+class Device : public Retainable<Device> {
+public:
+    virtual ~Device();
+
+    InodeMetadata metadata() const { return { }; }
+
+    virtual KResultOr<Retained<FileDescriptor>> open(int options);
+    virtual void close();
+
+    virtual bool can_read(Process&) const = 0;
+    virtual bool can_write(Process&) const = 0;
+
+    virtual ssize_t read(Process&, byte*, ssize_t) = 0;
+    virtual ssize_t write(Process&, const byte*, ssize_t) = 0;
+
+    unsigned major() const { return m_major; }
+    unsigned minor() const { return m_minor; }
+
+    virtual bool is_tty() const { return false; }
+    virtual bool is_master_pty() const { return false; }
+
+    virtual int ioctl(Process&, unsigned request, unsigned arg);
+
+    virtual const char* class_name() const = 0;
+
+    uid_t uid() const { return m_uid; }
+    uid_t gid() const { return m_gid; }
+
+    virtual bool is_block_device() const { return false; }
+    virtual bool is_character_device() const { return false; }
+
+protected:
+    Device(unsigned major, unsigned minor);
+    void set_uid(uid_t uid) { m_uid = uid; }
+    void set_gid(gid_t gid) { m_gid = gid; }
+
+private:
+    unsigned m_major { 0 };
+    unsigned m_minor { 0 };
+    uid_t m_uid { 0 };
+    gid_t m_gid { 0 };
+};