2023-08-30 17:31:07 +02:00
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/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _LIBPS2_H
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#define _LIBPS2_H
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/*
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* Copyright (C) 1999-2002 Vojtech Pavlik
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* Copyright (C) 2004 Dmitry Torokhov
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*/
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#include <linux/bitops.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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struct ps2dev;
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/**
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* enum ps2_disposition - indicates how received byte should be handled
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* @PS2_PROCESS: pass to the main protocol handler, process normally
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* @PS2_IGNORE: skip the byte
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* @PS2_ERROR: do not process the byte, abort command in progress
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*/
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enum ps2_disposition {
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PS2_PROCESS,
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PS2_IGNORE,
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PS2_ERROR,
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};
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typedef enum ps2_disposition (*ps2_pre_receive_handler_t)(struct ps2dev *, u8,
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unsigned int);
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typedef void (*ps2_receive_handler_t)(struct ps2dev *, u8);
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/**
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* struct ps2dev - represents a device using PS/2 protocol
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* @serio: a serio port used by the PS/2 device
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* @cmd_mutex: a mutex ensuring that only one command is executing at a time
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* @wait: a waitqueue used to signal completion from the serio interrupt handler
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* @flags: various internal flags indicating stages of PS/2 command execution
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* @cmdbuf: buffer holding command response
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* @cmdcnt: outstanding number of bytes of the command response
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* @nak: a byte transmitted by the device when it refuses command
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* @pre_receive_handler: checks communication errors and returns disposition
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* (&enum ps2_disposition) of the received data byte
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* @receive_handler: main handler of particular PS/2 protocol, such as keyboard
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* or mouse protocol
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*/
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struct ps2dev {
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struct serio *serio;
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struct mutex cmd_mutex;
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wait_queue_head_t wait;
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unsigned long flags;
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u8 cmdbuf[8];
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u8 cmdcnt;
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u8 nak;
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ps2_pre_receive_handler_t pre_receive_handler;
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ps2_receive_handler_t receive_handler;
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};
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void ps2_init(struct ps2dev *ps2dev, struct serio *serio,
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ps2_pre_receive_handler_t pre_receive_handler,
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ps2_receive_handler_t receive_handler);
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int ps2_sendbyte(struct ps2dev *ps2dev, u8 byte, unsigned int timeout);
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void ps2_drain(struct ps2dev *ps2dev, size_t maxbytes, unsigned int timeout);
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void ps2_begin_command(struct ps2dev *ps2dev);
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void ps2_end_command(struct ps2dev *ps2dev);
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int __ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command);
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int ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command);
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int ps2_sliced_command(struct ps2dev *ps2dev, u8 command);
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bool ps2_is_keyboard_id(u8 id);
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irqreturn_t ps2_interrupt(struct serio *serio, u8 data, unsigned int flags);
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#endif /* _LIBPS2_H */
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