1/* SPDX-License-Identifier: GPL-2.0-only */
2#ifndef _LINUX_I8042_H
3#define _LINUX_I8042_H
4
5
6#include <linux/errno.h>
7#include <linux/types.h>
8
9/*
10 * Standard commands.
11 */
12
13#define I8042_CMD_CTL_RCTR	0x0120
14#define I8042_CMD_CTL_WCTR	0x1060
15#define I8042_CMD_CTL_TEST	0x01aa
16
17#define I8042_CMD_KBD_DISABLE	0x00ad
18#define I8042_CMD_KBD_ENABLE	0x00ae
19#define I8042_CMD_KBD_TEST	0x01ab
20#define I8042_CMD_KBD_LOOP	0x11d2
21
22#define I8042_CMD_AUX_DISABLE	0x00a7
23#define I8042_CMD_AUX_ENABLE	0x00a8
24#define I8042_CMD_AUX_TEST	0x01a9
25#define I8042_CMD_AUX_SEND	0x10d4
26#define I8042_CMD_AUX_LOOP	0x11d3
27
28#define I8042_CMD_MUX_PFX	0x0090
29#define I8042_CMD_MUX_SEND	0x1090
30
31/*
32 * Status register bits.
33 */
34
35#define I8042_STR_PARITY	0x80
36#define I8042_STR_TIMEOUT	0x40
37#define I8042_STR_AUXDATA	0x20
38#define I8042_STR_KEYLOCK	0x10
39#define I8042_STR_CMDDAT	0x08
40#define I8042_STR_MUXERR	0x04
41#define I8042_STR_IBF		0x02
42#define I8042_STR_OBF		0x01
43
44/*
45 * Control register bits.
46 */
47
48#define I8042_CTR_KBDINT	0x01
49#define I8042_CTR_AUXINT	0x02
50#define I8042_CTR_IGNKEYLOCK	0x08
51#define I8042_CTR_KBDDIS	0x10
52#define I8042_CTR_AUXDIS	0x20
53#define I8042_CTR_XLATE		0x40
54
55struct serio;
56
57#if defined(CONFIG_SERIO_I8042) || defined(CONFIG_SERIO_I8042_MODULE)
58
59void i8042_lock_chip(void);
60void i8042_unlock_chip(void);
61int i8042_command(unsigned char *param, int command);
62int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
63					struct serio *serio));
64int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
65				       struct serio *serio));
66
67#else
68
69static inline void i8042_lock_chip(void)
70{
71}
72
73static inline void i8042_unlock_chip(void)
74{
75}
76
77static inline int i8042_command(unsigned char *param, int command)
78{
79	return -ENODEV;
80}
81
82static inline int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
83					struct serio *serio))
84{
85	return -ENODEV;
86}
87
88static inline int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
89				       struct serio *serio))
90{
91	return -ENODEV;
92}
93
94#endif
95
96#endif
97