Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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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
15struct device;
16
17/*
18 * Some platforms don't support the GPIO programming interface.
19 *
20 * In case some driver uses it anyway (it should normally have
21 * depended on GENERIC_GPIO), these routines help the compiler
22 * optimize out much GPIO-related code ... or trigger a runtime
23 * warning when something is wrongly called.
24 */
25
26static inline int gpio_is_valid(int number)
27{
28 return 0;
29}
30
31static inline int gpio_request(unsigned gpio, const char *label)
32{
33 return -ENOSYS;
34}
35
36static inline void gpio_free(unsigned gpio)
37{
38 might_sleep();
39
40 /* GPIO can never have been requested */
41 WARN_ON(1);
42}
43
44static inline int gpio_direction_input(unsigned gpio)
45{
46 return -ENOSYS;
47}
48
49static inline int gpio_direction_output(unsigned gpio, int value)
50{
51 return -ENOSYS;
52}
53
54static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
55{
56 return -ENOSYS;
57}
58
59static inline int gpio_get_value(unsigned gpio)
60{
61 /* GPIO can never have been requested or set as {in,out}put */
62 WARN_ON(1);
63 return 0;
64}
65
66static inline void gpio_set_value(unsigned gpio, int value)
67{
68 /* GPIO can never have been requested or set as output */
69 WARN_ON(1);
70}
71
72static inline int gpio_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 int gpio_get_value_cansleep(unsigned gpio)
80{
81 /* GPIO can never have been requested or set as {in,out}put */
82 WARN_ON(1);
83 return 0;
84}
85
86static inline void gpio_set_value_cansleep(unsigned gpio, int value)
87{
88 /* GPIO can never have been requested or set as output */
89 WARN_ON(1);
90}
91
92static inline int gpio_export(unsigned gpio, bool direction_may_change)
93{
94 /* GPIO can never have been requested or set as {in,out}put */
95 WARN_ON(1);
96 return -EINVAL;
97}
98
99static inline int gpio_export_link(struct device *dev, const char *name,
100 unsigned gpio)
101{
102 /* GPIO can never have been exported */
103 WARN_ON(1);
104 return -EINVAL;
105}
106
107static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
108{
109 /* GPIO can never have been requested */
110 WARN_ON(1);
111 return -EINVAL;
112}
113
114static inline void gpio_unexport(unsigned gpio)
115{
116 /* GPIO can never have been exported */
117 WARN_ON(1);
118}
119
120static inline int gpio_to_irq(unsigned gpio)
121{
122 /* GPIO can never have been requested or set as input */
123 WARN_ON(1);
124 return -EINVAL;
125}
126
127static inline int irq_to_gpio(unsigned irq)
128{
129 /* irq can never have been returned from gpio_to_irq() */
130 WARN_ON(1);
131 return -EINVAL;
132}
133
134#endif
135
136#endif /* __LINUX_GPIO_H */