summaryrefslogtreecommitdiffstats
path: root/include/linux/gpio.h
blob: 6155ecf192b0466f02ea616b5b8d8ef9fd5fc2f5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
#ifndef __LINUX_GPIO_H
#define __LINUX_GPIO_H

/* see Documentation/gpio.txt */

/* make these flag values available regardless of GPIO kconfig options */
#define GPIOF_DIR_OUT	(0 << 0)
#define GPIOF_DIR_IN	(1 << 0)

#define GPIOF_INIT_LOW	(0 << 1)
#define GPIOF_INIT_HIGH	(1 << 1)

#define GPIOF_IN		(GPIOF_DIR_IN)
#define GPIOF_OUT_INIT_LOW	(GPIOF_DIR_OUT | GPIOF_INIT_LOW)
#define GPIOF_OUT_INIT_HIGH	(GPIOF_DIR_OUT | GPIOF_INIT_HIGH)

/* Gpio pin is open drain */
#define GPIOF_OPEN_DRAIN	(1 << 2)

/* Gpio pin is open source */
#define GPIOF_OPEN_SOURCE	(1 << 3)

/**
 * struct gpio - a structure describing a GPIO with configuration
 * @gpio:	the GPIO number
 * @flags:	GPIO configuration as specified by GPIOF_*
 * @label:	a literal description string of this GPIO
 */
struct gpio {
	unsigned	gpio;
	unsigned long	flags;
	const char	*label;
};

#ifdef CONFIG_GENERIC_GPIO
#include <asm/gpio.h>

#else

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/bug.h>

struct device;
struct gpio_chip;

static inline bool gpio_is_valid(int number)
{
	return false;
}

static inline int gpio_request(unsigned gpio, const char *label)
{
	return -ENOSYS;
}

static inline int gpio_request_one(unsigned gpio,
					unsigned long flags, const char *label)
{
	return -ENOSYS;
}

static inline int gpio_request_array(const struct gpio *array, size_t num)
{
	return -ENOSYS;
}

static inline void gpio_free(unsigned gpio)
{
	might_sleep();

	/* GPIO can never have been requested */
	WARN_ON(1);
}

static inline void gpio_free_array(const struct gpio *array, size_t num)
{
	might_sleep();

	/* GPIO can never have been requested */
	WARN_ON(1);
}

static inline int gpio_direction_input(unsigned gpio)
{
	return -ENOSYS;
}

static inline int gpio_direction_output(unsigned gpio, int value)
{
	return -ENOSYS;
}

static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
{
	return -ENOSYS;
}

static inline int gpio_get_value(unsigned gpio)
{
	/* GPIO can never have been requested or set as {in,out}put */
	WARN_ON(1);
	return 0;
}

static inline void gpio_set_value(unsigned gpio, int value)
{
	/* GPIO can never have been requested or set as output */
	WARN_ON(1);
}

static inline int gpio_cansleep(unsigned gpio)
{
	/* GPIO can never have been requested or set as {in,out}put */
	WARN_ON(1);
	return 0;
}

static inline int gpio_get_value_cansleep(unsigned gpio)
{
	/* GPIO can never have been requested or set as {in,out}put */
	WARN_ON(1);
	return 0;
}

static inline void gpio_set_value_cansleep(unsigned gpio, int value)
{
	/* GPIO can never have been requested or set as output */
	WARN_ON(1);
}

static inline int gpio_export(unsigned gpio, bool direction_may_change)
{
	/* GPIO can never have been requested or set as {in,out}put */
	WARN_ON(1);
	return -EINVAL;
}

static inline int gpio_export_link(struct device *dev, const char *name,
				unsigned gpio)
{
	/* GPIO can never have been exported */
	WARN_ON(1);
	return -EINVAL;
}

static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
{
	/* GPIO can never have been requested */
	WARN_ON(1);
	return -EINVAL;
}

static inline void gpio_unexport(unsigned gpio)
{
	/* GPIO can never have been exported */
	WARN_ON(1);
}

static inline int gpio_to_irq(unsigned gpio)
{
	/* GPIO can never have been requested or set as input */
	WARN_ON(1);
	return -EINVAL;
}

static inline int irq_to_gpio(unsigned irq)
{
	/* irq can never have been returned from gpio_to_irq() */
	WARN_ON(1);
	return -EINVAL;
}

#endif

#endif /* __LINUX_GPIO_H */