drivers/char/nwbutton.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __NWBUTTON_H
   3 #define __NWBUTTON_H
   4
   5 /*
   6  *      NetWinder Button Driver-
   7  *      Copyright (C) Alex Holden <alex@linuxhacker.org> 1998, 1999.
   8  */
   9
  10 #ifdef __NWBUTTON_C     /* Actually compiling the driver itself */
  11
  12 /* Various defines: */
  13
  14 #define NUM_PRESSES_REBOOT 2    /* How many presses to activate shutdown */
  15 #define BUTTON_DELAY 30         /* How many jiffies for sequence to end */
  16 #define VERSION "0.3"           /* Driver version number */
  17 #define BUTTON_MINOR 158        /* Major 10, Minor 158, /dev/nwbutton */
  18
  19 /* Structure definitions: */
  20
  21 struct button_callback {
  22         void (*callback) (void);
  23         int count;
  24 };
  25
  26 /* Function prototypes: */
  27
  28 static void button_sequence_finished(struct timer_list *unused);
  29 static irqreturn_t button_handler (int irq, void *dev_id);
  30 int button_init (void);
  31 int button_add_callback (void (*callback) (void), int count);
  32 int button_del_callback (void (*callback) (void));
  33 static void button_consume_callbacks (int bpcount);
  34
  35 #else /* Not compiling the driver itself */
  36
  37 extern int button_add_callback (void (*callback) (void), int count);
  38 extern int button_del_callback (void (*callback) (void));
  39
  40 #endif /* __NWBUTTON_C */
  41 #endif /* __NWBUTTON_H */