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#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
static void do_blink(unsigned long data);
static DEFINE_TIMER(blink_timer, do_blink, 0 ,0);
static void do_blink(unsigned long data)
{
static long count;
if (panic_blink)
panic_blink(count++);
blink_timer.expires = jiffies + msecs_to_jiffies(1);
add_timer(&blink_timer);
}
static int blink_panic_event(struct notifier_block *blk,
unsigned long event, void *arg)
{
do_blink(0);
return 0;
}
static struct notifier_block blink_notify = {
.notifier_call = blink_panic_event,
};
static __init int blink_init(void)
{
printk(KERN_INFO "Enabling keyboard blinking\n");
atomic_notifier_chain_register(&panic_notifier_list, &blink_notify);
return 0;
}
static __exit void blink_remove(void)
{
del_timer_sync(&blink_timer);
atomic_notifier_chain_unregister(&panic_notifier_list, &blink_notify);
}
module_init(blink_init);
module_exit(blink_remove);
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