xref: /openbmc/linux/drivers/char/nwbutton.h (revision 6ce6ae7c)
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 
20 struct button_callback {
21 	void (*callback) (void);
22 	int count;
23 };
24 
25 /* Function prototypes: */
26 
27 static void button_sequence_finished(struct timer_list *unused);
28 static irqreturn_t button_handler (int irq, void *dev_id);
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 */
41