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 /* Gpio pin is open drain */
18 #define GPIOF_OPEN_DRAIN (1 << 2)
19
20 /* Gpio pin is open source */
21 #define GPIOF_OPEN_SOURCE (1 << 3)
22
23 /**
24 * struct gpio - a structure describing a GPIO with configuration
25 * @gpio: the GPIO number
26 * @flags: GPIO configuration as specified by GPIOF_*
27 * @label: a literal description string of this GPIO
28 */
29 struct gpio {
30 unsigned gpio;
31 unsigned long flags;
32 const char *label;
33 };
34
35 #ifdef CONFIG_GENERIC_GPIO
36 #include <asm/gpio.h>
37
38 #else
39
40 #include <linux/kernel.h>
41 #include <linux/types.h>
42 #include <linux/errno.h>
43 #include <linux/bug.h>
44
45 struct device;
46 struct gpio_chip;
47
gpio_is_valid(int number)48 static inline bool gpio_is_valid(int number)
49 {
50 return false;
51 }
52
gpio_request(unsigned gpio,const char * label)53 static inline int gpio_request(unsigned gpio, const char *label)
54 {
55 return -ENOSYS;
56 }
57
gpio_request_one(unsigned gpio,unsigned long flags,const char * label)58 static inline int gpio_request_one(unsigned gpio,
59 unsigned long flags, const char *label)
60 {
61 return -ENOSYS;
62 }
63
gpio_request_array(const struct gpio * array,size_t num)64 static inline int gpio_request_array(const struct gpio *array, size_t num)
65 {
66 return -ENOSYS;
67 }
68
gpio_free(unsigned gpio)69 static inline void gpio_free(unsigned gpio)
70 {
71 might_sleep();
72
73 /* GPIO can never have been requested */
74 WARN_ON(1);
75 }
76
gpio_free_array(const struct gpio * array,size_t num)77 static inline void gpio_free_array(const struct gpio *array, size_t num)
78 {
79 might_sleep();
80
81 /* GPIO can never have been requested */
82 WARN_ON(1);
83 }
84
gpio_direction_input(unsigned gpio)85 static inline int gpio_direction_input(unsigned gpio)
86 {
87 return -ENOSYS;
88 }
89
gpio_direction_output(unsigned gpio,int value)90 static inline int gpio_direction_output(unsigned gpio, int value)
91 {
92 return -ENOSYS;
93 }
94
gpio_set_debounce(unsigned gpio,unsigned debounce)95 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
96 {
97 return -ENOSYS;
98 }
99
gpio_get_value(unsigned gpio)100 static inline int gpio_get_value(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
gpio_set_value(unsigned gpio,int value)107 static inline void gpio_set_value(unsigned gpio, int value)
108 {
109 /* GPIO can never have been requested or set as output */
110 WARN_ON(1);
111 }
112
gpio_cansleep(unsigned gpio)113 static inline int gpio_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_get_value_cansleep(unsigned gpio)120 static inline int gpio_get_value_cansleep(unsigned gpio)
121 {
122 /* GPIO can never have been requested or set as {in,out}put */
123 WARN_ON(1);
124 return 0;
125 }
126
gpio_set_value_cansleep(unsigned gpio,int value)127 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
128 {
129 /* GPIO can never have been requested or set as output */
130 WARN_ON(1);
131 }
132
gpio_export(unsigned gpio,bool direction_may_change)133 static inline int gpio_export(unsigned gpio, bool direction_may_change)
134 {
135 /* GPIO can never have been requested or set as {in,out}put */
136 WARN_ON(1);
137 return -EINVAL;
138 }
139
gpio_export_link(struct device * dev,const char * name,unsigned gpio)140 static inline int gpio_export_link(struct device *dev, const char *name,
141 unsigned gpio)
142 {
143 /* GPIO can never have been exported */
144 WARN_ON(1);
145 return -EINVAL;
146 }
147
gpio_sysfs_set_active_low(unsigned gpio,int value)148 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
149 {
150 /* GPIO can never have been requested */
151 WARN_ON(1);
152 return -EINVAL;
153 }
154
gpio_unexport(unsigned gpio)155 static inline void gpio_unexport(unsigned gpio)
156 {
157 /* GPIO can never have been exported */
158 WARN_ON(1);
159 }
160
gpio_to_irq(unsigned gpio)161 static inline int gpio_to_irq(unsigned gpio)
162 {
163 /* GPIO can never have been requested or set as input */
164 WARN_ON(1);
165 return -EINVAL;
166 }
167
irq_to_gpio(unsigned irq)168 static inline int irq_to_gpio(unsigned irq)
169 {
170 /* irq can never have been returned from gpio_to_irq() */
171 WARN_ON(1);
172 return -EINVAL;
173 }
174
175 #endif
176
177 #endif /* __LINUX_GPIO_H */
178