1 /* SPDX-License-Identifier: GPL-2.0-only */ 1
2 #ifndef _LIBPS2_H
3 #define _LIBPS2_H
4
5 /*
6 * Copyright (C) 1999-2002 Vojtech Pavlik
7 * Copyright (C) 2004 Dmitry Torokhov
8 */
9
10 #include <linux/bitops.h>
11 #include <linux/interrupt.h>
12 #include <linux/mutex.h>
13 #include <linux/types.h>
14 #include <linux/wait.h>
15
16 struct ps2dev;
17
18 /**
19 * enum ps2_disposition - indicates how receiv
20 * @PS2_PROCESS: pass to the main protocol han
21 * @PS2_IGNORE: skip the byte
22 * @PS2_ERROR: do not process the byte, abort
23 */
24 enum ps2_disposition {
25 PS2_PROCESS,
26 PS2_IGNORE,
27 PS2_ERROR,
28 };
29
30 typedef enum ps2_disposition (*ps2_pre_receive
31
32 typedef void (*ps2_receive_handler_t)(struct p
33
34 /**
35 * struct ps2dev - represents a device using P
36 * @serio: a serio port used by the PS/2 devic
37 * @cmd_mutex: a mutex ensuring that only one
38 * @wait: a waitqueue used to signal completio
39 * @flags: various internal flags indicating s
40 * @cmdbuf: buffer holding command response
41 * @cmdcnt: outstanding number of bytes of the
42 * @nak: a byte transmitted by the device when
43 * @pre_receive_handler: checks communication
44 * (&enum ps2_disposition) of the received dat
45 * @receive_handler: main handler of particula
46 * or mouse protocol
47 */
48 struct ps2dev {
49 struct serio *serio;
50 struct mutex cmd_mutex;
51 wait_queue_head_t wait;
52 unsigned long flags;
53 u8 cmdbuf[8];
54 u8 cmdcnt;
55 u8 nak;
56
57 ps2_pre_receive_handler_t pre_receive_
58 ps2_receive_handler_t receive_handler;
59 };
60
61 void ps2_init(struct ps2dev *ps2dev, struct se
62 ps2_pre_receive_handler_t pre_re
63 ps2_receive_handler_t receive_ha
64 int ps2_sendbyte(struct ps2dev *ps2dev, u8 byt
65 void ps2_drain(struct ps2dev *ps2dev, size_t m
66 void ps2_begin_command(struct ps2dev *ps2dev);
67 void ps2_end_command(struct ps2dev *ps2dev);
68 int __ps2_command(struct ps2dev *ps2dev, u8 *p
69 int ps2_command(struct ps2dev *ps2dev, u8 *par
70 int ps2_sliced_command(struct ps2dev *ps2dev,
71 bool ps2_is_keyboard_id(u8 id);
72
73 irqreturn_t ps2_interrupt(struct serio *serio,
74
75 #endif /* _LIBPS2_H */
76
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.