kernel/irq/dummychip.c

   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  */
  16 static 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  */
  27 static void noop(struct irq_data *data) { }
  28
  29 static unsigned int noop_ret(struct irq_data *data)
  30 {
  31         return 0;
  32 }
  33
  34 #ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
  35 static void compat_noop(unsigned int irq) { }
  36 #define END_INIT .end = compat_noop
  37 #else
  38 #define END_INIT
  39 #endif
  40
  41 /*
  42  * Generic no controller implementation
  43  */
  44 struct irq_chip no_irq_chip = {
  45         .name           = "none",
  46         .irq_startup    = noop_ret,
  47         .irq_shutdown   = noop,
  48         .irq_enable     = noop,
  49         .irq_disable    = noop,
  50         .irq_ack        = ack_bad,
  51         END_INIT
  52 };
  53
  54 /*
  55  * Generic dummy implementation which can be used for
  56  * real dumb interrupt sources
  57  */
  58 struct irq_chip dummy_irq_chip = {
  59         .name           = "dummy",
  60         .irq_startup    = noop_ret,
  61         .irq_shutdown   = noop,
  62         .irq_enable     = noop,
  63         .irq_disable    = noop,
  64         .irq_ack        = noop,
  65         .irq_mask       = noop,
  66         .irq_unmask     = noop,
  67         END_INIT
  68 };