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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/char/scan_keyb.c
2 * $Id: scan_keyb.c,v 1.2 2000/07/04 06:24:42 yaegashi Exp $
3 * Copyright (C) 2000 YAEGASHI Takeshi
4 * Generic scan keyboard driver
7 #include <linux/spinlock.h>
8 #include <linux/sched.h>
9 #include <linux/interrupt.h>
10 #include <linux/tty.h>
12 #include <linux/signal.h>
13 #include <linux/init.h>
14 #include <linux/kbd_ll.h>
15 #include <linux/delay.h>
16 #include <linux/random.h>
17 #include <linux/poll.h>
18 #include <linux/miscdevice.h>
19 #include <linux/slab.h>
20 #include <linux/kbd_kern.h>
21 #include <linux/timer.h>
23 #define SCANHZ (HZ/20)
25 struct scan_keyboard
{
26 struct scan_keyboard
*next
;
27 int (*scan
)(unsigned char *buffer
);
28 const unsigned char *table
;
29 unsigned char *s0
, *s1
;
33 static int scan_jiffies
=0;
34 static struct scan_keyboard
*keyboards
=NULL
;
35 struct timer_list scan_timer
;
37 static void check_kbd(const unsigned char *table
,
38 unsigned char *new, unsigned char *old
, int length
)
40 int need_tasklet_schedule
=0;
41 unsigned int xor, bit
;
44 if((xor=*new^*old
)==0) {
48 for(bit
=0x01; bit
<0x100; bit
<<=1) {
50 handle_scancode(*table
, !(*new&bit
));
51 need_tasklet_schedule
=1;
53 printk("0x%x %s\n", *table
, (*new&bit
)?"released":"pressed");
62 if(need_tasklet_schedule
)
63 tasklet_schedule(&keyboard_tasklet
);
67 static void scan_kbd(unsigned long dummy
)
69 struct scan_keyboard
*kbd
;
73 for(kbd
=keyboards
; kbd
!=NULL
; kbd
=kbd
->next
) {
75 if(!kbd
->scan(kbd
->s0
))
77 kbd
->s0
, kbd
->s1
, kbd
->length
);
79 memcpy(kbd
->s0
, kbd
->s1
, kbd
->length
);
82 if(!kbd
->scan(kbd
->s1
))
84 kbd
->s1
, kbd
->s0
, kbd
->length
);
86 memcpy(kbd
->s1
, kbd
->s0
, kbd
->length
);
91 init_timer(&scan_timer
);
92 scan_timer
.expires
= jiffies
+ SCANHZ
;
94 scan_timer
.function
= scan_kbd
;
95 add_timer(&scan_timer
);
99 int register_scan_keyboard(int (*scan
)(unsigned char *buffer
),
100 const unsigned char *table
,
103 struct scan_keyboard
*kbd
;
105 kbd
= kmalloc(sizeof(struct scan_keyboard
), GFP_KERNEL
);
113 kbd
->s0
= kmalloc(length
, GFP_KERNEL
);
117 kbd
->s1
= kmalloc(length
, GFP_KERNEL
);
121 memset(kbd
->s0
, -1, kbd
->length
);
122 memset(kbd
->s1
, -1, kbd
->length
);
140 void __init
scan_kbd_init(void)
142 init_timer(&scan_timer
);
143 scan_timer
.expires
= jiffies
+ SCANHZ
;
145 scan_timer
.function
= scan_kbd
;
146 add_timer(&scan_timer
);
148 printk(KERN_INFO
"Generic scan keyboard driver initialized\n");