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libps2.h
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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 */
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 void ps2_begin_command(struct ps2dev *ps2dev);
48 void ps2_end_command(struct ps2dev *ps2dev);
49 int __ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command);
50 int ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command);
51 int ps2_handle_ack(struct ps2dev *ps2dev, unsigned char data);
52 int ps2_handle_response(struct ps2dev *ps2dev, unsigned char data);
53 void ps2_cmd_aborted(struct ps2dev *ps2dev);
54 int ps2_is_keyboard_id(char id);
55 
56 #endif /* _LIBPS2_H */