linux-sg2042/arch/x86/kernel/pcspeaker.c

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#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);