1 files changed, 149 insertions, 0 deletions
diff --git a/drivers/char/scan_keyb.c b/drivers/char/scan_keyb.c
new file mode 100644
index 00000000000..2b5bb4f5754
--- /dev/null
+++ b/drivers/char/scan_keyb.c
@@ -0,0 +1,149 @@
+/*
+ *	$Id: scan_keyb.c,v 1.2 2000/07/04 06:24:42 yaegashi Exp $ 
+ *	Copyright (C) 2000 YAEGASHI Takeshi
+ *	Generic scan keyboard driver
+ */
+
+#include <linux/spinlock.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/mm.h>
+#include <linux/signal.h>
+#include <linux/init.h>
+#include <linux/kbd_ll.h>
+#include <linux/delay.h>
+#include <linux/random.h>
+#include <linux/poll.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/kbd_kern.h>
+#include <linux/timer.h>
+
+#define SCANHZ	(HZ/20)
+
+struct scan_keyboard {
+	struct scan_keyboard *next;
+	int (*scan)(unsigned char *buffer);
+	const unsigned char *table;
+	unsigned char *s0, *s1;
+	int length;
+};
+
+static int scan_jiffies=0;
+static struct scan_keyboard *keyboards=NULL;
+struct timer_list scan_timer;
+
+static void check_kbd(const unsigned char *table,
+		      unsigned char *new, unsigned char *old, int length)
+{
+	int need_tasklet_schedule=0;
+	unsigned int xor, bit;
+	
+	while(length-->0) {
+		if((xor=*new^*old)==0) {
+			table+=8;
+		}
+		else {
+			for(bit=0x01; bit<0x100; bit<<=1) {
+				if(xor&bit) {
+					handle_scancode(*table, !(*new&bit));
+					need_tasklet_schedule=1;
+#if 0
+					printk("0x%x %s\n", *table, (*new&bit)?"released":"pressed");
+#endif
+				}
+				table++;
+			}
+		}
+		new++; old++;
+	}
+
+	if(need_tasklet_schedule)
+		tasklet_schedule(&keyboard_tasklet);
+}
+
+
+static void scan_kbd(unsigned long dummy)
+{
+	struct scan_keyboard *kbd;
+
+	scan_jiffies++;
+
+	for(kbd=keyboards; kbd!=NULL; kbd=kbd->next) {
+		if(scan_jiffies&1) {
+			if(!kbd->scan(kbd->s0))
+				check_kbd(kbd->table,
+					  kbd->s0, kbd->s1, kbd->length);
+			else
+				memcpy(kbd->s0, kbd->s1, kbd->length);
+		}
+		else {
+			if(!kbd->scan(kbd->s1))
+				check_kbd(kbd->table,
+					  kbd->s1, kbd->s0, kbd->length);
+			else
+				memcpy(kbd->s1, kbd->s0, kbd->length);
+		}
+		
+	}
+
+	init_timer(&scan_timer);
+	scan_timer.expires = jiffies + SCANHZ;
+	scan_timer.data = 0;
+	scan_timer.function = scan_kbd;
+	add_timer(&scan_timer);
+}
+
+
+int register_scan_keyboard(int (*scan)(unsigned char *buffer),
+			   const unsigned char *table,
+			   int length)
+{
+	struct scan_keyboard *kbd;
+
+	kbd = kmalloc(sizeof(struct scan_keyboard), GFP_KERNEL);
+	if (kbd == NULL)
+		goto error_out;
+
+	kbd->scan=scan;
+	kbd->table=table;
+	kbd->length=length;
+
+	kbd->s0 = kmalloc(length, GFP_KERNEL);
+	if (kbd->s0 == NULL)
+		goto error_free_kbd;
+
+	kbd->s1 = kmalloc(length, GFP_KERNEL);
+	if (kbd->s1 == NULL)
+		goto error_free_s0;
+
+	memset(kbd->s0, -1, kbd->length);
+	memset(kbd->s1, -1, kbd->length);
+	
+	kbd->next=keyboards;
+	keyboards=kbd;
+
+	return 0;
+
+ error_free_s0:
+	kfree(kbd->s0);
+
+ error_free_kbd:
+	kfree(kbd);
+
+ error_out:
+	return -ENOMEM;
+}
+			      
+			      
+void __init scan_kbd_init(void)
+{
+	init_timer(&scan_timer);
+	scan_timer.expires = jiffies + SCANHZ;
+	scan_timer.data = 0;
+	scan_timer.function = scan_kbd;
+	add_timer(&scan_timer);
+
+	printk(KERN_INFO "Generic scan keyboard driver initialized\n");
+}