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/*
* Generic scan keyboard driver
*
* Copyright (C) 2000 YAEGASHI Takeshi
* Copyright (C) 2003 Andriy Skulysh
* Copyright (C) 2006 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/kbd_kern.h>
#include <linux/input.h>
#include <linux/timer.h>
#include "scan_keyb.h"
#define SCANHZ (HZ/20)
static int scan_jiffies;
static struct scan_keyboard *keyboards;
struct timer_list scan_timer;
static char *hpkbd_name = "Hitachi scankeyboard";
static char *hpkbd_phys = "input0";
static void check_kbd(struct scan_keyboard *kbd,
unsigned char *new, unsigned char *old)
{
const unsigned char *table = kbd->table;
int length = kbd->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) {
input_report_key(kbd->dev, *table,
!(*new & bit));
need_tasklet_schedule = 1;
}
table++;
}
}
new++;
old++;
}
if (need_tasklet_schedule) {
input_sync(kbd->dev);
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, kbd->s0, kbd->s1);
else
memcpy(kbd->s0, kbd->s1, kbd->length);
} else {
if (!kbd->scan(kbd->s1))
check_kbd(kbd, kbd->s1, kbd->s0);
else
memcpy(kbd->s1, kbd->s0, kbd->length);
}
}
mod_timer(&scan_timer, jiffies + SCANHZ);
}
int register_scan_keyboard(struct scan_keyboard *kbd)
{
int i;
kbd->s0 = kmalloc(kbd->length, GFP_KERNEL);
if (kbd->s0 == NULL)
goto error;
kbd->s1 = kmalloc(kbd->length, GFP_KERNEL);
if (kbd->s1 == NULL)
goto error;
memset(kbd->s0, -1, kbd->length);
memset(kbd->s1, -1, kbd->length);
kbd->dev = input_allocate_device();
if (!kbd->dev)
goto error;
kbd->dev->name = hpkbd_name;
kbd->dev->phys = hpkbd_phys;
kbd->dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
init_input_dev(kbd->dev);
kbd->dev->keycode = (unsigned char *)kbd->table;
kbd->dev->keycodesize = sizeof(unsigned char);
kbd->dev->keycodemax = ARRAY_SIZE(kbd->table);
for (i = 0; i < 128; i++)
if (kbd->table[i])
set_bit(kbd->table[i], kbd->dev->keybit);
clear_bit(0, kbd->dev->keybit);
input_register_device(kbd->dev);
kbd->next = keyboards;
keyboards = kbd;
init_timer(&scan_timer);
scan_timer.expires = jiffies + SCANHZ;
scan_timer.data = 0;
scan_timer.function = scan_kbd;
add_timer(&scan_timer);
return 0;
error:
kfree(kbd->s1);
kfree(kbd->s0);
return -ENOMEM;
}
EXPORT_SYMBOL_GPL(register_scan_keyboard);
void unregister_scan_keyboard(struct scan_keyboard *kbd)
{
del_timer_sync(&scan_timer);
keyboards = kbd->next;
input_unregister_device(kbd->dev);
input_free_device(kbd->dev);
}
EXPORT_SYMBOL_GPL(unregister_scan_keyboard);
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