linux/kernel/irq/dummychip.c
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   1/*
   2 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
   3 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
   4 *
   5 * This file contains the dummy interrupt chip implementation
   6 */
   7#include <linux/interrupt.h>
   8#include <linux/irq.h>
   9#include <linux/export.h>
  10
  11#include "internals.h"
  12
  13/*
  14 * What should we do if we get a hw irq event on an illegal vector?
  15 * Each architecture has to answer this themself.
  16 */
  17static void ack_bad(struct irq_data *data)
  18{
  19        struct irq_desc *desc = irq_data_to_desc(data);
  20
  21        print_irq_desc(data->irq, desc);
  22        ack_bad_irq(data->irq);
  23}
  24
  25/*
  26 * NOP functions
  27 */
  28static void noop(struct irq_data *data) { }
  29
  30static unsigned int noop_ret(struct irq_data *data)
  31{
  32        return 0;
  33}
  34
  35/*
  36 * Generic no controller implementation
  37 */
  38struct irq_chip no_irq_chip = {
  39        .name           = "none",
  40        .irq_startup    = noop_ret,
  41        .irq_shutdown   = noop,
  42        .irq_enable     = noop,
  43        .irq_disable    = noop,
  44        .irq_ack        = ack_bad,
  45};
  46
  47/*
  48 * Generic dummy implementation which can be used for
  49 * real dumb interrupt sources
  50 */
  51struct irq_chip dummy_irq_chip = {
  52        .name           = "dummy",
  53        .irq_startup    = noop_ret,
  54        .irq_shutdown   = noop,
  55        .irq_enable     = noop,
  56        .irq_disable    = noop,
  57        .irq_ack        = noop,
  58        .irq_mask       = noop,
  59        .irq_unmask     = noop,
  60};
  61EXPORT_SYMBOL_GPL(dummy_irq_chip);
  62
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