include/linux/irqreturn.h

   1 /* irqreturn.h */
   2 #ifndef _LINUX_IRQRETURN_H
   3 #define _LINUX_IRQRETURN_H
   4
   5 /*
   6  * For 2.4.x compatibility, 2.4.x can use
   7  *
   8  *      typedef void irqreturn_t;
   9  *      #define IRQ_NONE
  10  *      #define IRQ_HANDLED
  11  *      #define IRQ_RETVAL(x)
  12  *
  13  * To mix old-style and new-style irq handler returns.
  14  *
  15  * IRQ_NONE means we didn't handle it.
  16  * IRQ_HANDLED means that we did have a valid interrupt and handled it.
  17  * IRQ_RETVAL(x) selects on the two depending on x being non-zero (for handled)
  18  */
  19 typedef int irqreturn_t;
  20
  21 #define IRQ_NONE        (0)
  22 #define IRQ_HANDLED     (1)
  23 #define IRQ_RETVAL(x)   ((x) != 0)
  24
  25 #endif