1 #ifndef __LINUX_GPIO_H
2 #define __LINUX_GPIO_H
3
4 #include <linux/errno.h>
5
6 /* see Documentation/gpio.txt */
7
8 /* make these flag values available regardless of GPIO kconfig options */
9 #define GPIOF_DIR_OUT (0 << 0)
10 #define GPIOF_DIR_IN (1 << 0)
11
12 #define GPIOF_INIT_LOW (0 << 1)
13 #define GPIOF_INIT_HIGH (1 << 1)
14
15 #define GPIOF_IN (GPIOF_DIR_IN)
16 #define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
17 #define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
18
19 /* Gpio pin is open drain */
20 #define GPIOF_OPEN_DRAIN (1 << 2)
21
22 /* Gpio pin is open source */
23 #define GPIOF_OPEN_SOURCE (1 << 3)
24
25 #define GPIOF_EXPORT (1 << 4)
26 #define GPIOF_EXPORT_CHANGEABLE (1 << 5)
27 #define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT)
28 #define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
29
30 /**
31 * struct gpio - a structure describing a GPIO with configuration
32 * @gpio: the GPIO number
33 * @flags: GPIO configuration as specified by GPIOF_*
34 * @label: a literal description string of this GPIO
35 */
36 struct gpio {
37 unsigned gpio;
38 unsigned long flags;
39 const char *label;
40 };
41
42 #ifdef CONFIG_GPIOLIB
43
44 #ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H
45 #include <asm/gpio.h>
46 #else
47
48 #include <asm-generic/gpio.h>
49
gpio_get_value(unsigned int gpio)50 static inline int gpio_get_value(unsigned int gpio)
51 {
52 return __gpio_get_value(gpio);
53 }
54
gpio_set_value(unsigned int gpio,int value)55 static inline void gpio_set_value(unsigned int gpio, int value)
56 {
57 __gpio_set_value(gpio, value);
58 }
59
gpio_cansleep(unsigned int gpio)60 static inline int gpio_cansleep(unsigned int gpio)
61 {
62 return __gpio_cansleep(gpio);
63 }
64
gpio_to_irq(unsigned int gpio)65 static inline int gpio_to_irq(unsigned int gpio)
66 {
67 return __gpio_to_irq(gpio);
68 }
69
irq_to_gpio(unsigned int irq)70 static inline int irq_to_gpio(unsigned int irq)
71 {
72 return -EINVAL;
73 }
74
75 #endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */
76
77 #else /* ! CONFIG_GPIOLIB */
78
79 #include <linux/kernel.h>
80 #include <linux/types.h>
81 #include <linux/errno.h>
82 #include <linux/bug.h>
83
84 struct device;
85 struct gpio_chip;
86
gpio_is_valid(int number)87 static inline bool gpio_is_valid(int number)
88 {
89 return false;
90 }
91
gpio_request(unsigned gpio,const char * label)92 static inline int gpio_request(unsigned gpio, const char *label)
93 {
94 return -ENOSYS;
95 }
96
gpio_request_one(unsigned gpio,unsigned long flags,const char * label)97 static inline int gpio_request_one(unsigned gpio,
98 unsigned long flags, const char *label)
99 {
100 return -ENOSYS;
101 }
102
gpio_request_array(const struct gpio * array,size_t num)103 static inline int gpio_request_array(const struct gpio *array, size_t num)
104 {
105 return -ENOSYS;
106 }
107
gpio_free(unsigned gpio)108 static inline void gpio_free(unsigned gpio)
109 {
110 might_sleep();
111
112 /* GPIO can never have been requested */
113 WARN_ON(1);
114 }
115
gpio_free_array(const struct gpio * array,size_t num)116 static inline void gpio_free_array(const struct gpio *array, size_t num)
117 {
118 might_sleep();
119
120 /* GPIO can never have been requested */
121 WARN_ON(1);
122 }
123
gpio_direction_input(unsigned gpio)124 static inline int gpio_direction_input(unsigned gpio)
125 {
126 return -ENOSYS;
127 }
128
gpio_direction_output(unsigned gpio,int value)129 static inline int gpio_direction_output(unsigned gpio, int value)
130 {
131 return -ENOSYS;
132 }
133
gpio_set_debounce(unsigned gpio,unsigned debounce)134 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
135 {
136 return -ENOSYS;
137 }
138
gpio_get_value(unsigned gpio)139 static inline int gpio_get_value(unsigned gpio)
140 {
141 /* GPIO can never have been requested or set as {in,out}put */
142 WARN_ON(1);
143 return 0;
144 }
145
gpio_set_value(unsigned gpio,int value)146 static inline void gpio_set_value(unsigned gpio, int value)
147 {
148 /* GPIO can never have been requested or set as output */
149 WARN_ON(1);
150 }
151
gpio_cansleep(unsigned gpio)152 static inline int gpio_cansleep(unsigned gpio)
153 {
154 /* GPIO can never have been requested or set as {in,out}put */
155 WARN_ON(1);
156 return 0;
157 }
158
gpio_get_value_cansleep(unsigned gpio)159 static inline int gpio_get_value_cansleep(unsigned gpio)
160 {
161 /* GPIO can never have been requested or set as {in,out}put */
162 WARN_ON(1);
163 return 0;
164 }
165
gpio_set_value_cansleep(unsigned gpio,int value)166 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
167 {
168 /* GPIO can never have been requested or set as output */
169 WARN_ON(1);
170 }
171
gpio_export(unsigned gpio,bool direction_may_change)172 static inline int gpio_export(unsigned gpio, bool direction_may_change)
173 {
174 /* GPIO can never have been requested or set as {in,out}put */
175 WARN_ON(1);
176 return -EINVAL;
177 }
178
gpio_export_link(struct device * dev,const char * name,unsigned gpio)179 static inline int gpio_export_link(struct device *dev, const char *name,
180 unsigned gpio)
181 {
182 /* GPIO can never have been exported */
183 WARN_ON(1);
184 return -EINVAL;
185 }
186
gpio_sysfs_set_active_low(unsigned gpio,int value)187 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
188 {
189 /* GPIO can never have been requested */
190 WARN_ON(1);
191 return -EINVAL;
192 }
193
gpio_unexport(unsigned gpio)194 static inline void gpio_unexport(unsigned gpio)
195 {
196 /* GPIO can never have been exported */
197 WARN_ON(1);
198 }
199
gpio_to_irq(unsigned gpio)200 static inline int gpio_to_irq(unsigned gpio)
201 {
202 /* GPIO can never have been requested or set as input */
203 WARN_ON(1);
204 return -EINVAL;
205 }
206
irq_to_gpio(unsigned irq)207 static inline int irq_to_gpio(unsigned irq)
208 {
209 /* irq can never have been returned from gpio_to_irq() */
210 WARN_ON(1);
211 return -EINVAL;
212 }
213
214 static inline int
gpiochip_add_pin_range(struct gpio_chip * chip,const char * pinctl_name,unsigned int gpio_offset,unsigned int pin_offset,unsigned int npins)215 gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
216 unsigned int gpio_offset, unsigned int pin_offset,
217 unsigned int npins)
218 {
219 WARN_ON(1);
220 return -EINVAL;
221 }
222
223 static inline void
gpiochip_remove_pin_ranges(struct gpio_chip * chip)224 gpiochip_remove_pin_ranges(struct gpio_chip *chip)
225 {
226 WARN_ON(1);
227 }
228
229 #endif /* ! CONFIG_GPIOLIB */
230
231 struct device;
232
233 /* bindings for managed devices that want to request gpios */
234 int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
235 int devm_gpio_request_one(struct device *dev, unsigned gpio,
236 unsigned long flags, const char *label);
237 void devm_gpio_free(struct device *dev, unsigned int gpio);
238
239 #endif /* __LINUX_GPIO_H */
240