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
15struct device;
16struct gpio_chip;
17
18/*
19 * Some platforms don't support the GPIO programming interface.
20 *
21 * In case some driver uses it anyway (it should normally have
22 * depended on GENERIC_GPIO), these routines help the compiler
23 * optimize out much GPIO-related code ... or trigger a runtime
24 * warning when something is wrongly called.
25 */
26
27static inline int gpio_is_valid(int number)
28{
29 return 0;
30}
31
32static inline int gpio_request(unsigned gpio, const char *label)
33{
34 return -ENOSYS;
35}
36
37static inline void gpio_free(unsigned gpio)
38{
39 might_sleep();
40
41 /* GPIO can never have been requested */
42 WARN_ON(1);
43}
44
45static inline int gpio_direction_input(unsigned gpio)
46{
47 return -ENOSYS;
48}
49
50static inline int gpio_direction_output(unsigned gpio, int value)
51{
52 return -ENOSYS;
53}
54
55static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
56{
57 return -ENOSYS;
58}
59
60static inline int gpio_get_value(unsigned gpio)
61{
62 /* GPIO can never have been requested or set as {in,out}put */
63 WARN_ON(1);
64 return 0;
65}
66
67static inline void gpio_set_value(unsigned gpio, int value)
68{
69 /* GPIO can never have been requested or set as output */
70 WARN_ON(1);
71}
72
73static inline int gpio_cansleep(unsigned gpio)
74{
75 /* GPIO can never have been requested or set as {in,out}put */
76 WARN_ON(1);
77 return 0;
78}
79
80static inline int gpio_get_value_cansleep(unsigned gpio)
81{
82 /* GPIO can never have been requested or set as {in,out}put */
83 WARN_ON(1);
84 return 0;
85}
86
87static inline void gpio_set_value_cansleep(unsigned gpio, int value)
88{
89 /* GPIO can never have been requested or set as output */
90 WARN_ON(1);
91}
92
93static inline int gpio_export(unsigned gpio, bool direction_may_change)
94{
95 /* GPIO can never have been requested or set as {in,out}put */
96 WARN_ON(1);
97 return -EINVAL;
98}
99
100static inline int gpio_export_link(struct device *dev, const char *name,
101 unsigned gpio)
102{
103 /* GPIO can never have been exported */
104 WARN_ON(1);
105 return -EINVAL;
106}
107
108static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
109{
110 /* GPIO can never have been requested */
111 WARN_ON(1);
112 return -EINVAL;
113}
114
115static inline void gpio_unexport(unsigned gpio)
116{
117 /* GPIO can never have been exported */
118 WARN_ON(1);
119}
120
121static inline int gpio_to_irq(unsigned gpio)
122{
123 /* GPIO can never have been requested or set as input */
124 WARN_ON(1);
125 return -EINVAL;
126}
127
128static inline int irq_to_gpio(unsigned irq)
129{
130 /* irq can never have been returned from gpio_to_irq() */
131 WARN_ON(1);
132 return -EINVAL;
133}
134
135#endif
136
137#endif /* __LINUX_GPIO_H */