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[mirror_ubuntu-zesty-kernel.git] / include / linux / gpio.h
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
15 struct device;
16 struct gpio;
17 struct 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
28 static inline int gpio_is_valid(int number)
29 {
30 return 0;
31 }
32
33 static inline int gpio_request(unsigned gpio, const char *label)
34 {
35 return -ENOSYS;
36 }
37
38 static inline int gpio_request_one(unsigned gpio,
39 unsigned long flags, const char *label)
40 {
41 return -ENOSYS;
42 }
43
44 static inline int gpio_request_array(struct gpio *array, size_t num)
45 {
46 return -ENOSYS;
47 }
48
49 static inline void gpio_free(unsigned gpio)
50 {
51 might_sleep();
52
53 /* GPIO can never have been requested */
54 WARN_ON(1);
55 }
56
57 static 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
65 static inline int gpio_direction_input(unsigned gpio)
66 {
67 return -ENOSYS;
68 }
69
70 static inline int gpio_direction_output(unsigned gpio, int value)
71 {
72 return -ENOSYS;
73 }
74
75 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
76 {
77 return -ENOSYS;
78 }
79
80 static 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
87 static 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
93 static 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
100 static 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
107 static 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
113 static 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
120 static 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
128 static 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
135 static inline void gpio_unexport(unsigned gpio)
136 {
137 /* GPIO can never have been exported */
138 WARN_ON(1);
139 }
140
141 static 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
148 static 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 */