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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _LIBPS2_H
#define _LIBPS2_H
/*
* Copyright (C) 1999-2002 Vojtech Pavlik
* Copyright (C) 2004 Dmitry Torokhov
*/
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <linux/types.h>
#include <linux/wait.h>
#define PS2_CMD_SETSCALE11 0x00e6
#define PS2_CMD_SETRES 0x10e8
#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_RET_ERR 0xfc
#define PS2_FLAG_ACK BIT(0) /* Waiting for ACK/NAK */
#define PS2_FLAG_CMD BIT(1) /* Waiting for a command to finish */
#define PS2_FLAG_CMD1 BIT(2) /* Waiting for the first byte of command response */
#define PS2_FLAG_WAITID BIT(3) /* Command executing is GET ID */
#define PS2_FLAG_NAK BIT(4) /* Last transmission was NAKed */
#define PS2_FLAG_ACK_CMD BIT(5) /* Waiting to ACK the command (first) byte */
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;
u8 cmdbuf[8];
u8 cmdcnt;
u8 nak;
};
void ps2_init(struct ps2dev *ps2dev, struct serio *serio);
int ps2_sendbyte(struct ps2dev *ps2dev, u8 byte, unsigned int timeout);
void ps2_drain(struct ps2dev *ps2dev, size_t maxbytes, unsigned int timeout);
void ps2_begin_command(struct ps2dev *ps2dev);
void ps2_end_command(struct ps2dev *ps2dev);
int __ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command);
int ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command);
int ps2_sliced_command(struct ps2dev *ps2dev, u8 command);
bool ps2_handle_ack(struct ps2dev *ps2dev, u8 data);
bool ps2_handle_response(struct ps2dev *ps2dev, u8 data);
void ps2_cmd_aborted(struct ps2dev *ps2dev);
bool ps2_is_keyboard_id(u8 id);
#endif /* _LIBPS2_H */