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/* make these flag values available regardless of GPIO kconfig options */
7#define GPIOF_DIR_OUT (0 << 0)
8#define GPIOF_DIR_IN (1 << 0)
9
10#define GPIOF_INIT_LOW (0 << 1)
11#define GPIOF_INIT_HIGH (1 << 1)
12
13#define GPIOF_IN (GPIOF_DIR_IN)
14#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
15#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
16
17/**
18 * struct gpio - a structure describing a GPIO with configuration
19 * @gpio: the GPIO number
20 * @flags: GPIO configuration as specified by GPIOF_*
21 * @label: a literal description string of this GPIO
22 */
23struct gpio {
24 unsigned gpio;
25 unsigned long flags;
26 const char *label;
27};
28
29#ifdef CONFIG_GENERIC_GPIO
30#include <asm/gpio.h>
31
32#else
33
34#include <linux/kernel.h>
35#include <linux/types.h>
36#include <linux/errno.h>
37
38struct device;
39struct gpio_chip;
40
41static inline bool gpio_is_valid(int number)
42{
43 return false;
44}
45
46static inline int gpio_request(unsigned gpio, const char *label)
47{
48 return -ENOSYS;
49}
50
51static inline int gpio_request_one(unsigned gpio,
52 unsigned long flags, const char *label)
53{
54 return -ENOSYS;
55}
56
57static inline int gpio_request_array(const struct gpio *array, size_t num)
58{
59 return -ENOSYS;
60}
61
62static inline void gpio_free(unsigned gpio)
63{
64 might_sleep();
65
66 /* GPIO can never have been requested */
67 WARN_ON(1);
68}
69
70static inline void gpio_free_array(const struct gpio *array, size_t num)
71{
72 might_sleep();
73
74 /* GPIO can never have been requested */
75 WARN_ON(1);
76}
77
78static inline int gpio_direction_input(unsigned gpio)
79{
80 return -ENOSYS;
81}
82
83static inline int gpio_direction_output(unsigned gpio, int value)
84{
85 return -ENOSYS;
86}
87
88static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
89{
90 return -ENOSYS;
91}
92
93static inline int gpio_get_value(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 void gpio_set_value(unsigned gpio, int value)
101{
102 /* GPIO can never have been requested or set as output */
103 WARN_ON(1);
104}
105
106static inline int gpio_cansleep(unsigned gpio)
107{
108 /* GPIO can never have been requested or set as {in,out}put */
109 WARN_ON(1);
110 return 0;
111}
112
113static inline int gpio_get_value_cansleep(unsigned gpio)
114{
115 /* GPIO can never have been requested or set as {in,out}put */
116 WARN_ON(1);
117 return 0;
118}
119
120static inline void gpio_set_value_cansleep(unsigned gpio, int value)
121{
122 /* GPIO can never have been requested or set as output */
123 WARN_ON(1);
124}
125
126static inline int gpio_export(unsigned gpio, bool direction_may_change)
127{
128 /* GPIO can never have been requested or set as {in,out}put */
129 WARN_ON(1);
130 return -EINVAL;
131}
132
133static inline int gpio_export_link(struct device *dev, const char *name,
134 unsigned gpio)
135{
136 /* GPIO can never have been exported */
137 WARN_ON(1);
138 return -EINVAL;
139}
140
141static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
142{
143 /* GPIO can never have been requested */
144 WARN_ON(1);
145 return -EINVAL;
146}
147
148static inline void gpio_unexport(unsigned gpio)
149{
150 /* GPIO can never have been exported */
151 WARN_ON(1);
152}
153
154static inline int gpio_to_irq(unsigned gpio)
155{
156 /* GPIO can never have been requested or set as input */
157 WARN_ON(1);
158 return -EINVAL;
159}
160
161static inline int irq_to_gpio(unsigned irq)
162{
163 /* irq can never have been returned from gpio_to_irq() */
164 WARN_ON(1);
165 return -EINVAL;
166}
167
168#endif
169
170#endif /* __LINUX_GPIO_H */