Linux kernel mirror (for testing)
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linux
1#ifndef __LINUX_GPIO_H
2#define __LINUX_GPIO_H
3
4/* see Documentation/gpio.txt */
5
6#ifdef CONFIG_GENERIC_GPIO
7#include <asm/gpio.h>
8
9#else
10
11#include <linux/kernel.h>
12#include <linux/types.h>
13#include <linux/errno.h>
14
15/*
16 * Some platforms don't support the GPIO programming interface.
17 *
18 * In case some driver uses it anyway (it should normally have
19 * depended on GENERIC_GPIO), these routines help the compiler
20 * optimize out much GPIO-related code ... or trigger a runtime
21 * warning when something is wrongly called.
22 */
23
24static inline int gpio_is_valid(int number)
25{
26 return 0;
27}
28
29static inline int gpio_request(unsigned gpio, const char *label)
30{
31 return -ENOSYS;
32}
33
34static inline void gpio_free(unsigned gpio)
35{
36 might_sleep();
37
38 /* GPIO can never have been requested */
39 WARN_ON(1);
40}
41
42static inline int gpio_direction_input(unsigned gpio)
43{
44 return -ENOSYS;
45}
46
47static inline int gpio_direction_output(unsigned gpio, int value)
48{
49 return -ENOSYS;
50}
51
52static inline int gpio_get_value(unsigned gpio)
53{
54 /* GPIO can never have been requested or set as {in,out}put */
55 WARN_ON(1);
56 return 0;
57}
58
59static inline void gpio_set_value(unsigned gpio, int value)
60{
61 /* GPIO can never have been requested or set as output */
62 WARN_ON(1);
63}
64
65static inline int gpio_cansleep(unsigned gpio)
66{
67 /* GPIO can never have been requested or set as {in,out}put */
68 WARN_ON(1);
69 return 0;
70}
71
72static inline int gpio_get_value_cansleep(unsigned gpio)
73{
74 /* GPIO can never have been requested or set as {in,out}put */
75 WARN_ON(1);
76 return 0;
77}
78
79static inline void gpio_set_value_cansleep(unsigned gpio, int value)
80{
81 /* GPIO can never have been requested or set as output */
82 WARN_ON(1);
83}
84
85static inline int gpio_export(unsigned gpio, bool direction_may_change)
86{
87 /* GPIO can never have been requested or set as {in,out}put */
88 WARN_ON(1);
89 return -EINVAL;
90}
91
92static inline void gpio_unexport(unsigned gpio)
93{
94 /* GPIO can never have been exported */
95 WARN_ON(1);
96}
97
98static inline int gpio_to_irq(unsigned gpio)
99{
100 /* GPIO can never have been requested or set as input */
101 WARN_ON(1);
102 return -EINVAL;
103}
104
105static inline int irq_to_gpio(unsigned irq)
106{
107 /* irq can never have been returned from gpio_to_irq() */
108 WARN_ON(1);
109 return -EINVAL;
110}
111
112#endif
113
114#endif /* __LINUX_GPIO_H */