150 lines
2.9 KiB
C
150 lines
2.9 KiB
C
/*
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* $Id: scan_keyb.c,v 1.2 2000/07/04 06:24:42 yaegashi Exp $
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* Copyright (C) 2000 YAEGASHI Takeshi
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* Generic scan keyboard driver
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*/
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#include <linux/spinlock.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/tty.h>
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#include <linux/mm.h>
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#include <linux/signal.h>
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#include <linux/init.h>
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#include <linux/kbd_ll.h>
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#include <linux/delay.h>
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#include <linux/random.h>
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#include <linux/poll.h>
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#include <linux/miscdevice.h>
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#include <linux/slab.h>
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#include <linux/kbd_kern.h>
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#include <linux/timer.h>
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#define SCANHZ (HZ/20)
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struct scan_keyboard {
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struct scan_keyboard *next;
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int (*scan)(unsigned char *buffer);
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const unsigned char *table;
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unsigned char *s0, *s1;
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int length;
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};
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static int scan_jiffies=0;
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static struct scan_keyboard *keyboards=NULL;
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struct timer_list scan_timer;
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static void check_kbd(const unsigned char *table,
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unsigned char *new, unsigned char *old, int length)
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{
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int need_tasklet_schedule=0;
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unsigned int xor, bit;
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while(length-->0) {
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if((xor=*new^*old)==0) {
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table+=8;
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}
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else {
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for(bit=0x01; bit<0x100; bit<<=1) {
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if(xor&bit) {
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handle_scancode(*table, !(*new&bit));
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need_tasklet_schedule=1;
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#if 0
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printk("0x%x %s\n", *table, (*new&bit)?"released":"pressed");
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#endif
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}
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table++;
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}
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}
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new++; old++;
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}
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if(need_tasklet_schedule)
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tasklet_schedule(&keyboard_tasklet);
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}
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static void scan_kbd(unsigned long dummy)
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{
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struct scan_keyboard *kbd;
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scan_jiffies++;
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for(kbd=keyboards; kbd!=NULL; kbd=kbd->next) {
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if(scan_jiffies&1) {
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if(!kbd->scan(kbd->s0))
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check_kbd(kbd->table,
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kbd->s0, kbd->s1, kbd->length);
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else
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memcpy(kbd->s0, kbd->s1, kbd->length);
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}
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else {
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if(!kbd->scan(kbd->s1))
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check_kbd(kbd->table,
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kbd->s1, kbd->s0, kbd->length);
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else
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memcpy(kbd->s1, kbd->s0, kbd->length);
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}
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}
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init_timer(&scan_timer);
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scan_timer.expires = jiffies + SCANHZ;
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scan_timer.data = 0;
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scan_timer.function = scan_kbd;
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add_timer(&scan_timer);
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}
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int register_scan_keyboard(int (*scan)(unsigned char *buffer),
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const unsigned char *table,
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int length)
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{
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struct scan_keyboard *kbd;
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kbd = kmalloc(sizeof(struct scan_keyboard), GFP_KERNEL);
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if (kbd == NULL)
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goto error_out;
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kbd->scan=scan;
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kbd->table=table;
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kbd->length=length;
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kbd->s0 = kmalloc(length, GFP_KERNEL);
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if (kbd->s0 == NULL)
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goto error_free_kbd;
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kbd->s1 = kmalloc(length, GFP_KERNEL);
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if (kbd->s1 == NULL)
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goto error_free_s0;
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memset(kbd->s0, -1, kbd->length);
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memset(kbd->s1, -1, kbd->length);
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kbd->next=keyboards;
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keyboards=kbd;
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return 0;
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error_free_s0:
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kfree(kbd->s0);
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error_free_kbd:
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kfree(kbd);
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error_out:
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return -ENOMEM;
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}
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void __init scan_kbd_init(void)
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{
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init_timer(&scan_timer);
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scan_timer.expires = jiffies + SCANHZ;
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scan_timer.data = 0;
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scan_timer.function = scan_kbd;
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add_timer(&scan_timer);
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printk(KERN_INFO "Generic scan keyboard driver initialized\n");
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}
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