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 */
23 struct 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
38 struct device;
39 struct gpio_chip;
40
gpio_is_valid(int number)41 static inline bool gpio_is_valid(int number)
42 {
43 return false;
44 }
45
gpio_request(unsigned gpio,const char * label)46 static inline int gpio_request(unsigned gpio, const char *label)
47 {
48 return -ENOSYS;
49 }
50
gpio_request_one(unsigned gpio,unsigned long flags,const char * label)51 static inline int gpio_request_one(unsigned gpio,
52 unsigned long flags, const char *label)
53 {
54 return -ENOSYS;
55 }
56
gpio_request_array(const struct gpio * array,size_t num)57 static inline int gpio_request_array(const struct gpio *array, size_t num)
58 {
59 return -ENOSYS;
60 }
61
gpio_free(unsigned gpio)62 static inline void gpio_free(unsigned gpio)
63 {
64 might_sleep();
65
66 /* GPIO can never have been requested */
67 WARN_ON(1);
68 }
69
gpio_free_array(const struct gpio * array,size_t num)70 static 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
gpio_direction_input(unsigned gpio)78 static inline int gpio_direction_input(unsigned gpio)
79 {
80 return -ENOSYS;
81 }
82
gpio_direction_output(unsigned gpio,int value)83 static inline int gpio_direction_output(unsigned gpio, int value)
84 {
85 return -ENOSYS;
86 }
87
gpio_set_debounce(unsigned gpio,unsigned debounce)88 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
89 {
90 return -ENOSYS;
91 }
92
gpio_get_value(unsigned gpio)93 static 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
gpio_set_value(unsigned gpio,int value)100 static 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
gpio_cansleep(unsigned gpio)106 static 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
gpio_get_value_cansleep(unsigned gpio)113 static 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
gpio_set_value_cansleep(unsigned gpio,int value)120 static 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
gpio_export(unsigned gpio,bool direction_may_change)126 static 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
gpio_export_link(struct device * dev,const char * name,unsigned gpio)133 static 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
gpio_sysfs_set_active_low(unsigned gpio,int value)141 static 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
gpio_unexport(unsigned gpio)148 static inline void gpio_unexport(unsigned gpio)
149 {
150 /* GPIO can never have been exported */
151 WARN_ON(1);
152 }
153
gpio_to_irq(unsigned gpio)154 static 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
irq_to_gpio(unsigned irq)161 static 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 */
171