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/*
* Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
* Copyright (C) 2005-2006, Thomas Gleixner, Russell King
*
* This file contains the dummy interrupt chip implementation
*/
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/export.h>
#include "internals.h"
/*
* What should we do if we get a hw irq event on an illegal vector?
* Each architecture has to answer this themself.
*/
static void ack_bad(struct irq_data *data)
{
struct irq_desc *desc = irq_data_to_desc(data);
print_irq_desc(data->irq, desc);
ack_bad_irq(data->irq);
}
/*
* NOP functions
*/
static void noop(struct irq_data *data) { }
static unsigned int noop_ret(struct irq_data *data)
{
return 0;
}
/*
* Generic no controller implementation
*/
struct irq_chip no_irq_chip = {
.name = "none",
.irq_startup = noop_ret,
.irq_shutdown = noop,
.irq_enable = noop,
.irq_disable = noop,
.irq_ack = ack_bad,
};
/*
* Generic dummy implementation which can be used for
* real dumb interrupt sources
*/
struct irq_chip dummy_irq_chip = {
.name = "dummy",
.irq_startup = noop_ret,
.irq_shutdown = noop,
.irq_enable = noop,
.irq_disable = noop,
.irq_ack = noop,
.irq_mask = noop,
.irq_unmask = noop,
};
EXPORT_SYMBOL_GPL(dummy_irq_chip);
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