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1 #ifndef _LIBPS2_H
2 #define _LIBPS2_H
3 
4 /*
5  * Copyright (C) 1999-2002 Vojtech Pavlik
6  * Copyright (C) 2004 Dmitry Torokhov
7  *
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of the GNU General Public License version 2 as published by
10  * the Free Software Foundation.
11  */
12 
13 
14 #define PS2_CMD_GETID		0x02f2
15 #define PS2_CMD_RESET_BAT	0x02ff
16 
17 #define PS2_RET_BAT		0xaa
18 #define PS2_RET_ID		0x00
19 #define PS2_RET_ACK		0xfa
20 #define PS2_RET_NAK		0xfe
21 #define PS2_RET_ERR		0xfc
22 
23 #define PS2_FLAG_ACK		1	/* Waiting for ACK/NAK */
24 #define PS2_FLAG_CMD		2	/* Waiting for command to finish */
25 #define PS2_FLAG_CMD1		4	/* Waiting for the first byte of command response */
26 #define PS2_FLAG_WAITID		8	/* Command execiting is GET ID */
27 #define PS2_FLAG_NAK		16	/* Last transmission was NAKed */
28 
29 struct ps2dev {
30 	struct serio *serio;
31 
32 	/* Ensures that only one command is executing at a time */
33 	struct mutex cmd_mutex;
34 
35 	/* Used to signal completion from interrupt handler */
36 	wait_queue_head_t wait;
37 
38 	unsigned long flags;
39 	unsigned char cmdbuf[6];
40 	unsigned char cmdcnt;
41 	unsigned char nak;
42 };
43 
44 void ps2_init(struct ps2dev *ps2dev, struct serio *serio);
45 int ps2_sendbyte(struct ps2dev *ps2dev, unsigned char byte, int timeout);
46 void ps2_drain(struct ps2dev *ps2dev, int maxbytes, int timeout);
47 int ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command);
48 int ps2_handle_ack(struct ps2dev *ps2dev, unsigned char data);
49 int ps2_handle_response(struct ps2dev *ps2dev, unsigned char data);
50 void ps2_cmd_aborted(struct ps2dev *ps2dev);
51 int ps2_is_keyboard_id(char id);
52 
53 #endif /* _LIBPS2_H */
54