keyb_arc.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

/*
 *  linux/drivers/acorn/char/keyb_arc.c
 *
 *  Copyright (C) 2000 Russell King
 *
 * 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.
 *
 *  Acorn keyboard driver for ARM Linux.
 *
 *  The Acorn keyboard appears to have a ***very*** buggy reset protocol -
 *  every reset behaves differently.  We try to get round this by attempting
 *  a few things...
 */
#include <linux/config.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/ptrace.h>
#include <linux/signal.h>
#include <linux/timer.h>
#include <linux/random.h>
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/kbd_ll.h>
#include <linux/kbd_kern.h>
#include <linux/delay.h>

#include <asm/bitops.h>
#include <asm/keyboard.h>
#include <asm/irq.h>
#include <asm/hardware.h>
#include <asm/hardware/ioc.h>

#include "../../char/busmouse.h"

extern struct tasklet_struct keyboard_tasklet;
extern void kbd_reset_kdown(void);

#define VERSION 108

#define KBD_REPORT_ERR
#define KBD_REPORT_UNKN

#include <asm/io.h>
#include <asm/system.h>

static char kbd_txval[4];
static unsigned char kbd_txhead, kbd_txtail;
#define KBD_INCTXPTR(ptr) ((ptr) = ((ptr) + 1) & 3)
static int kbd_id = -1;
static DECLARE_WAIT_QUEUE_HEAD(kbd_waitq);
#ifdef CONFIG_KBDMOUSE
static int mousedev;
#endif

/*
 * Protocol codes to send the keyboard.
 */
#define HRST 0xff	/* reset keyboard */
#define RAK1 0xfe	/* reset response */
#define RAK2 0xfd	/* reset response */
#define BACK 0x3f	/* Ack for first keyboard pair */
#define SMAK 0x33	/* Last data byte ack (key scanning + mouse movement scanning) */
#define MACK 0x32	/* Last data byte ack (mouse movement scanning) */
#define SACK 0x31	/* Last data byte ack (key scanning) */
#define NACK 0x30	/* Last data byte ack (no scanning, mouse data) */
#define RQMP 0x22	/* Request mouse data */
#define PRST 0x21	/* nothing */
#define RQID 0x20	/* Request ID */

#define UP_FLAG 1

#ifdef CONFIG_MAGIC_SYSRQ
unsigned char a5kkbd_sysrq_xlate[] = 
{
    27,    0,    0,    0,    0,    0,    0,    0,
     0,    0,    0,    0,    0,    0,    0,    0,
   '`',  '1',  '2',  '3',  '4',  '5',  '6',  '7',
   '8',  '9',  '0',  '-',  '=',  '