29acc42e8e
When we probe PS/2 devices we first issue "Get ID" command and only if we receive what we consider a valid keyboard or mouse ID we disable the device and continue with protocol detection. That means that the device may be transmitting motion or keystroke data, while we expect ACK response. Instead of signaling failure if we see anything but ACK/NAK let's ignore "garbage" response until we see ACK for the command byte (first byte). The checks for subsequent ACKs of command parameters will continue be strict. Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
65 lines
2 KiB
C
65 lines
2 KiB
C
#ifndef _LIBPS2_H
|
|
#define _LIBPS2_H
|
|
|
|
/*
|
|
* Copyright (C) 1999-2002 Vojtech Pavlik
|
|
* Copyright (C) 2004 Dmitry Torokhov
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|
* the Free Software Foundation.
|
|
*/
|
|
|
|
#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 */
|