root/arch/x86/kernel/pcspeaker.c

DEFINITIONS

1. add_pcspkr

#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/init.h>

static __init int add_pcspkr(void)
{
        struct platform_device *pd;

        pd = platform_device_register_simple("pcspkr", -1, NULL, 0);

        return IS_ERR(pd) ? PTR_ERR(pd) : 0;
}
device_initcall(add_pcspkr);