Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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;
17struct gpio_chip;
18
19/*
20 * Some platforms don't support the GPIO programming interface.
21 *
22 * In case some driver uses it anyway (it should normally have
23 * depended on GENERIC_GPIO), these routines help the compiler
24 * optimize out much GPIO-related code ... or trigger a runtime
25 * warning when something is wrongly called.
26 */
27
28static inline int gpio_is_valid(int number)
29{
30 return 0;
31}
32
33static inline int gpio_request(unsigned gpio, const char *label)
34{
35 return -ENOSYS;
36}
37
38static inline int gpio_request_one(unsigned gpio,
39 unsigned long flags, const char *label)
40{
41 return -ENOSYS;
42}
43
44static inline int gpio_request_array(struct gpio *array, size_t num)
45{
46 return -ENOSYS;
47}
48
49static inline void gpio_free(unsigned gpio)
50{
51 might_sleep();
52
53 /* GPIO can never have been requested */
54 WARN_ON(1);
55}
56
57static inline void gpio_free_array(struct gpio *array, size_t num)
58{
59 might_sleep();
60
61 /* GPIO can never have been requested */
62 WARN_ON(1);
63}
64
65static inline int gpio_direction_input(unsigned gpio)
66{
67 return -ENOSYS;
68}
69
70static inline int gpio_direction_output(unsigned gpio, int value)
71{
72 return -ENOSYS;
73}
74
75static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
76{
77 return -ENOSYS;
78}
79
80static inline int gpio_get_value(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(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_cansleep(unsigned gpio)
94{
95 /* GPIO can never have been requested or set as {in,out}put */
96 WARN_ON(1);
97 return 0;
98}
99
100static inline int gpio_get_value_cansleep(unsigned gpio)
101{
102 /* GPIO can never have been requested or set as {in,out}put */
103 WARN_ON(1);
104 return 0;
105}
106
107static inline void gpio_set_value_cansleep(unsigned gpio, int value)
108{
109 /* GPIO can never have been requested or set as output */
110 WARN_ON(1);
111}
112
113static inline int gpio_export(unsigned gpio, bool direction_may_change)
114{
115 /* GPIO can never have been requested or set as {in,out}put */
116 WARN_ON(1);
117 return -EINVAL;
118}
119
120static inline int gpio_export_link(struct device *dev, const char *name,
121 unsigned gpio)
122{
123 /* GPIO can never have been exported */
124 WARN_ON(1);
125 return -EINVAL;
126}
127
128static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
129{
130 /* GPIO can never have been requested */
131 WARN_ON(1);
132 return -EINVAL;
133}
134
135static inline void gpio_unexport(unsigned gpio)
136{
137 /* GPIO can never have been exported */
138 WARN_ON(1);
139}
140
141static inline int gpio_to_irq(unsigned gpio)
142{
143 /* GPIO can never have been requested or set as input */
144 WARN_ON(1);
145 return -EINVAL;
146}
147
148static inline int irq_to_gpio(unsigned irq)
149{
150 /* irq can never have been returned from gpio_to_irq() */
151 WARN_ON(1);
152 return -EINVAL;
153}
154
155#endif
156
157#endif /* __LINUX_GPIO_H */