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nwbutton.h
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1 #ifndef __NWBUTTON_H
2 #define __NWBUTTON_H
3 
4 /*
5  * NetWinder Button Driver-
6  * Copyright (C) Alex Holden <[email protected]> 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);
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 */