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/*
12 * Some platforms don't support the GPIO programming interface.
13 *
14 * In case some driver uses it anyway (it should normally have
15 * depended on GENERIC_GPIO), these routines help the compiler
16 * optimize out much GPIO-related code ... or trigger a runtime
17 * warning when something is wrongly called.
18 */
19
20static inline int gpio_is_valid(int number)
21{
22 return 0;
23}
24
25static inline int gpio_request(unsigned gpio, const char *label)
26{
27 return -ENOSYS;
28}
29
30static inline void gpio_free(unsigned gpio)
31{
32 /* GPIO can never have been requested */
33 WARN_ON(1);
34}
35
36static inline int gpio_direction_input(unsigned gpio)
37{
38 return -ENOSYS;
39}
40
41static inline int gpio_direction_output(unsigned gpio, int value)
42{
43 return -ENOSYS;
44}
45
46static inline int gpio_get_value(unsigned gpio)
47{
48 /* GPIO can never have been requested or set as {in,out}put */
49 WARN_ON(1);
50 return 0;
51}
52
53static inline void gpio_set_value(unsigned gpio, int value)
54{
55 /* GPIO can never have been requested or set as output */
56 WARN_ON(1);
57}
58
59static inline int gpio_cansleep(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 int gpio_get_value_cansleep(unsigned gpio)
67{
68 /* GPIO can never have been requested or set as {in,out}put */
69 WARN_ON(1);
70 return 0;
71}
72
73static inline void gpio_set_value_cansleep(unsigned gpio, int value)
74{
75 /* GPIO can never have been requested or set as output */
76 WARN_ON(1);
77}
78
79static inline int gpio_to_irq(unsigned gpio)
80{
81 /* GPIO can never have been requested or set as input */
82 WARN_ON(1);
83 return -EINVAL;
84}
85
86static inline int irq_to_gpio(unsigned irq)
87{
88 /* irq can never have been returned from gpio_to_irq() */
89 WARN_ON(1);
90 return -EINVAL;
91}
92
93#endif
94
95#endif /* __LINUX_GPIO_H */