drivers/char/nwbutton.h

   1 #ifndef __NWBUTTON_H
   2 #define __NWBUTTON_H
   3
   4 /*
   5  *      NetWinder Button Driver-
   6  *      Copyright (C) Alex Holden <alex@linuxhacker.org> 1998, 1999.
   7  */
   8
   9 #ifdef __NWBUTTON_C     /* Actually compiling the driver itself */
  10
  11 /* Various defines: */
  12
  13 #define NUM_PRESSES_REBOOT 2    /* How many presses to activate shutdown */
  14 #define BUTTON_DELAY 30         /* How many jiffies for sequence to end */
  15 #define VERSION "0.3"           /* Driver version number */
  16 #define BUTTON_MINOR 158        /* Major 10, Minor 158, /dev/nwbutton */
  17
  18 /* Structure definitions: */
  19
  20 struct button_callback {
  21         void (*callback) (void);
  22         int count;
  23 };
  24
  25 /* Function prototypes: */
  26
  27 static void button_sequence_finished (unsigned long parameters);
  28 static irqreturn_t button_handler (int irq, void *dev_id, struct pt_regs *regs);
  29 int button_init (void);
  30 int button_add_callback (void (*callback) (void), int count);
  31 int button_del_callback (void (*callback) (void));
  32 static void button_consume_callbacks (int bpcount);
  33
  34 #else /* Not compiling the driver itself */
  35
  36 extern int button_add_callback (void (*callback) (void), int count);
  37 extern int button_del_callback (void (*callback) (void));
  38
  39 #endif /* __NWBUTTON_C */
  40 #endif /* __NWBUTTON_H */