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
  10#include "internals.h"
  11
  12/*
  13 * What should we do if we get a hw irq event on an illegal vector?
  14 * Each architecture has to answer this themself.
  15 */
  16static void ack_bad(struct irq_data *data)
  17{
  18        struct irq_desc *desc = irq_data_to_desc(data);
  19
  20        print_irq_desc(data->irq, desc);
  21        ack_bad_irq(data->irq);
  22}
  23
  24/*
  25 * NOP functions
  26 */
  27static void noop(struct irq_data *data) { }
  28
  29static unsigned int noop_ret(struct irq_data *data)
  30{
  31        return 0;
  32}
  33
  34/*
  35 * Generic no controller implementation
  36 */
  37struct irq_chip no_irq_chip = {
  38        .name           = "none",
  39        .irq_startup    = noop_ret,
  40        .irq_shutdown   = noop,
  41        .irq_enable     = noop,
  42        .irq_disable    = noop,
  43        .irq_ack        = ack_bad,
  44};
  45
  46/*
  47 * Generic dummy implementation which can be used for
  48 * real dumb interrupt sources
  49 */
  50struct irq_chip dummy_irq_chip = {
  51        .name           = "dummy",
  52        .irq_startup    = noop_ret,
  53        .irq_shutdown   = noop,
  54        .irq_enable     = noop,
  55        .irq_disable    = noop,
  56        .irq_ack        = noop,
  57        .irq_mask       = noop,
  58        .irq_unmask     = noop,
  59};
  60
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