#ifndef _LIBPS2_H
  #define _LIBPS2_H
  
  /*
   * Copyright (C) 1999-2002 Vojtech Pavlik
   * Copyright (C) 2004 Dmitry Torokhov
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published by
   * the Free Software Foundation.
   */
  
  
  #define PS2_CMD_GETID		0x02f2
  #define PS2_CMD_RESET_BAT	0x02ff
  
  #define PS2_RET_BAT		0xaa
  #define PS2_RET_ID		0x00
  #define PS2_RET_ACK		0xfa
  #define PS2_RET_NAK		0xfe
  
  #define PS2_FLAG_ACK		1	/* Waiting for ACK/NAK */
  #define PS2_FLAG_CMD		2	/* Waiting for command to finish */
  #define PS2_FLAG_CMD1		4	/* Waiting for the first byte of command response */
  #define PS2_FLAG_WAITID		8	/* Command execiting is GET ID */
  
  struct ps2dev {
  	struct serio *serio;
  
  	/* Ensures that only one command is executing at a time */

  	struct mutex cmd_mutex;

  
  	/* Used to signal completion from interrupt handler */
  	wait_queue_head_t wait;
  
  	unsigned long flags;
  	unsigned char cmdbuf[6];
  	unsigned char cmdcnt;
  	unsigned char nak;
  };
  
  void ps2_init(struct ps2dev *ps2dev, struct serio *serio);
  int ps2_sendbyte(struct ps2dev *ps2dev, unsigned char byte, int timeout);

  void ps2_drain(struct ps2dev *ps2dev, int maxbytes, int timeout);

  int ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command);
  int ps2_schedule_command(struct ps2dev *ps2dev, unsigned char *param, int command);
  int ps2_handle_ack(struct ps2dev *ps2dev, unsigned char data);
  int ps2_handle_response(struct ps2dev *ps2dev, unsigned char data);
  void ps2_cmd_aborted(struct ps2dev *ps2dev);

  int ps2_is_keyboard_id(char id);

  
  #endif /* _LIBPS2_H */