linux/kernel/irq/dummychip.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
   4 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
   5 *
   6 * This file contains the dummy interrupt chip implementation
   7 */
   8#include <linux/interrupt.h>
   9#include <linux/irq.h>
  10#include <linux/export.h>
  11
  12#include "internals.h"
  13
  14/*
  15 * What should we do if we get a hw irq event on an illegal vector?
  16 * Each architecture has to answer this themselves.
  17 */
  18static void ack_bad(struct irq_data *data)
  19{
  20        struct irq_desc *desc = irq_data_to_desc(data);
  21
  22        print_irq_desc(data->irq, desc);
  23        ack_bad_irq(data->irq);
  24}
  25
  26/*
  27 * NOP functions
  28 */
  29static void noop(struct irq_data *data) { }
  30
  31static unsigned int noop_ret(struct irq_data *data)
  32{
  33        return 0;
  34}
  35
  36/*
  37 * Generic no controller implementation
  38 */
  39struct irq_chip no_irq_chip = {
  40        .name           = "none",
  41        .irq_startup    = noop_ret,
  42        .irq_shutdown   = noop,
  43        .irq_enable     = noop,
  44        .irq_disable    = noop,
  45        .irq_ack        = ack_bad,
  46        .flags          = IRQCHIP_SKIP_SET_WAKE,
  47};
  48
  49/*
  50 * Generic dummy implementation which can be used for
  51 * real dumb interrupt sources
  52 */
  53struct irq_chip dummy_irq_chip = {
  54        .name           = "dummy",
  55        .irq_startup    = noop_ret,
  56        .irq_shutdown   = noop,
  57        .irq_enable     = noop,
  58        .irq_disable    = noop,
  59        .irq_ack        = noop,
  60        .irq_mask       = noop,
  61        .irq_unmask     = noop,
  62        .flags          = IRQCHIP_SKIP_SET_WAKE,
  63};
  64EXPORT_SYMBOL_GPL(dummy_irq_chip);
  65