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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576/* 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/interrupt.h>#include <linux/mutex.h>#include <linux/types.h>#include <linux/wait.h>
struct ps2dev;
/** * enum ps2_disposition - indicates how received byte should be handled * @PS2_PROCESS: pass to the main protocol handler, process normally * @PS2_IGNORE: skip the byte * @PS2_ERROR: do not process the byte, abort command in progress */enum ps2_disposition { PS2_PROCESS, PS2_IGNORE, PS2_ERROR,};
typedef enum ps2_disposition (*ps2_pre_receive_handler_t)(struct ps2dev *, u8, unsigned int);typedef void (*ps2_receive_handler_t)(struct ps2dev *, u8);
/** * struct ps2dev - represents a device using PS/2 protocol * @serio: a serio port used by the PS/2 device * @cmd_mutex: a mutex ensuring that only one command is executing at a time * @wait: a waitqueue used to signal completion from the serio interrupt handler * @flags: various internal flags indicating stages of PS/2 command execution * @cmdbuf: buffer holding command response * @cmdcnt: outstanding number of bytes of the command response * @nak: a byte transmitted by the device when it refuses command * @pre_receive_handler: checks communication errors and returns disposition * (&enum ps2_disposition) of the received data byte * @receive_handler: main handler of particular PS/2 protocol, such as keyboard * or mouse protocol */struct ps2dev { struct serio *serio; struct mutex cmd_mutex; wait_queue_head_t wait; unsigned long flags; u8 cmdbuf[8]; u8 cmdcnt; u8 nak;
ps2_pre_receive_handler_t pre_receive_handler; ps2_receive_handler_t receive_handler;};
void ps2_init(struct ps2dev *ps2dev, struct serio *serio, ps2_pre_receive_handler_t pre_receive_handler, ps2_receive_handler_t receive_handler);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_is_keyboard_id(u8 id);
irqreturn_t ps2_interrupt(struct serio *serio, u8 data, unsigned int flags);
#endif /* _LIBPS2_H */