linux/drivers/char/nwbutton.h
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   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
  18/* Structure definitions: */
  19
  20struct button_callback {
  21        void (*callback) (void);
  22        int count;
  23};
  24
  25/* Function prototypes: */
  26
  27static void button_sequence_finished(struct timer_list *unused);
  28static irqreturn_t button_handler (int irq, void *dev_id);
  29int button_init (void);
  30int button_add_callback (void (*callback) (void), int count);
  31int button_del_callback (void (*callback) (void));
  32static void button_consume_callbacks (int bpcount);
  33
  34#else /* Not compiling the driver itself */
  35
  36extern int button_add_callback (void (*callback) (void), int count);
  37extern int button_del_callback (void (*callback) (void));
  38
  39#endif /* __NWBUTTON_C */
  40#endif /* __NWBUTTON_H */
  41