xref: /openbmc/linux/include/linux/gpio.h (revision 94cdda6b)
1 #ifndef __LINUX_GPIO_H
2 #define __LINUX_GPIO_H
3 
4 #include <linux/errno.h>
5 
6 /* see Documentation/gpio/gpio-legacy.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 active-low */
20 #define GPIOF_ACTIVE_LOW        (1 << 2)
21 
22 /* Gpio pin is open drain */
23 #define GPIOF_OPEN_DRAIN	(1 << 3)
24 
25 /* Gpio pin is open source */
26 #define GPIOF_OPEN_SOURCE	(1 << 4)
27 
28 #define GPIOF_EXPORT		(1 << 5)
29 #define GPIOF_EXPORT_CHANGEABLE	(1 << 6)
30 #define GPIOF_EXPORT_DIR_FIXED	(GPIOF_EXPORT)
31 #define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
32 
33 /**
34  * struct gpio - a structure describing a GPIO with configuration
35  * @gpio:	the GPIO number
36  * @flags:	GPIO configuration as specified by GPIOF_*
37  * @label:	a literal description string of this GPIO
38  */
39 struct gpio {
40 	unsigned	gpio;
41 	unsigned long	flags;
42 	const char	*label;
43 };
44 
45 #ifdef CONFIG_GPIOLIB
46 
47 #ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H
48 #include <asm/gpio.h>
49 #else
50 
51 #include <asm-generic/gpio.h>
52 
53 static inline int gpio_get_value(unsigned int gpio)
54 {
55 	return __gpio_get_value(gpio);
56 }
57 
58 static inline void gpio_set_value(unsigned int gpio, int value)
59 {
60 	__gpio_set_value(gpio, value);
61 }
62 
63 static inline int gpio_cansleep(unsigned int gpio)
64 {
65 	return __gpio_cansleep(gpio);
66 }
67 
68 static inline int gpio_to_irq(unsigned int gpio)
69 {
70 	return __gpio_to_irq(gpio);
71 }
72 
73 static inline int irq_to_gpio(unsigned int irq)
74 {
75 	return -EINVAL;
76 }
77 
78 #endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */
79 
80 /* CONFIG_GPIOLIB: bindings for managed devices that want to request gpios */
81 
82 struct device;
83 
84 int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
85 int devm_gpio_request_one(struct device *dev, unsigned gpio,
86 			  unsigned long flags, const char *label);
87 void devm_gpio_free(struct device *dev, unsigned int gpio);
88 
89 #else /* ! CONFIG_GPIOLIB */
90 
91 #include <linux/kernel.h>
92 #include <linux/types.h>
93 #include <linux/bug.h>
94 #include <linux/pinctrl/pinctrl.h>
95 
96 struct device;
97 struct gpio_chip;
98 
99 static inline bool gpio_is_valid(int number)
100 {
101 	return false;
102 }
103 
104 static inline int gpio_request(unsigned gpio, const char *label)
105 {
106 	return -ENOSYS;
107 }
108 
109 static inline int gpio_request_one(unsigned gpio,
110 					unsigned long flags, const char *label)
111 {
112 	return -ENOSYS;
113 }
114 
115 static inline int gpio_request_array(const struct gpio *array, size_t num)
116 {
117 	return -ENOSYS;
118 }
119 
120 static inline void gpio_free(unsigned gpio)
121 {
122 	might_sleep();
123 
124 	/* GPIO can never have been requested */
125 	WARN_ON(1);
126 }
127 
128 static inline void gpio_free_array(const struct gpio *array, size_t num)
129 {
130 	might_sleep();
131 
132 	/* GPIO can never have been requested */
133 	WARN_ON(1);
134 }
135 
136 static inline int gpio_direction_input(unsigned gpio)
137 {
138 	return -ENOSYS;
139 }
140 
141 static inline int gpio_direction_output(unsigned gpio, int value)
142 {
143 	return -ENOSYS;
144 }
145 
146 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
147 {
148 	return -ENOSYS;
149 }
150 
151 static inline int gpio_get_value(unsigned gpio)
152 {
153 	/* GPIO can never have been requested or set as {in,out}put */
154 	WARN_ON(1);
155 	return 0;
156 }
157 
158 static inline void gpio_set_value(unsigned gpio, int value)
159 {
160 	/* GPIO can never have been requested or set as output */
161 	WARN_ON(1);
162 }
163 
164 static inline int gpio_cansleep(unsigned gpio)
165 {
166 	/* GPIO can never have been requested or set as {in,out}put */
167 	WARN_ON(1);
168 	return 0;
169 }
170 
171 static inline int gpio_get_value_cansleep(unsigned gpio)
172 {
173 	/* GPIO can never have been requested or set as {in,out}put */
174 	WARN_ON(1);
175 	return 0;
176 }
177 
178 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
179 {
180 	/* GPIO can never have been requested or set as output */
181 	WARN_ON(1);
182 }
183 
184 static inline int gpio_export(unsigned gpio, bool direction_may_change)
185 {
186 	/* GPIO can never have been requested or set as {in,out}put */
187 	WARN_ON(1);
188 	return -EINVAL;
189 }
190 
191 static inline int gpio_export_link(struct device *dev, const char *name,
192 				unsigned gpio)
193 {
194 	/* GPIO can never have been exported */
195 	WARN_ON(1);
196 	return -EINVAL;
197 }
198 
199 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
200 {
201 	/* GPIO can never have been requested */
202 	WARN_ON(1);
203 	return -EINVAL;
204 }
205 
206 static inline void gpio_unexport(unsigned gpio)
207 {
208 	/* GPIO can never have been exported */
209 	WARN_ON(1);
210 }
211 
212 static inline int gpio_to_irq(unsigned gpio)
213 {
214 	/* GPIO can never have been requested or set as input */
215 	WARN_ON(1);
216 	return -EINVAL;
217 }
218 
219 static inline int gpiochip_lock_as_irq(struct gpio_chip *chip,
220 				       unsigned int offset)
221 {
222 	WARN_ON(1);
223 	return -EINVAL;
224 }
225 
226 static inline void gpiochip_unlock_as_irq(struct gpio_chip *chip,
227 					  unsigned int offset)
228 {
229 	WARN_ON(1);
230 }
231 
232 static inline int irq_to_gpio(unsigned irq)
233 {
234 	/* irq can never have been returned from gpio_to_irq() */
235 	WARN_ON(1);
236 	return -EINVAL;
237 }
238 
239 static inline int
240 gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
241 		       unsigned int gpio_offset, unsigned int pin_offset,
242 		       unsigned int npins)
243 {
244 	WARN_ON(1);
245 	return -EINVAL;
246 }
247 
248 static inline int
249 gpiochip_add_pingroup_range(struct gpio_chip *chip,
250 			struct pinctrl_dev *pctldev,
251 			unsigned int gpio_offset, const char *pin_group)
252 {
253 	WARN_ON(1);
254 	return -EINVAL;
255 }
256 
257 static inline void
258 gpiochip_remove_pin_ranges(struct gpio_chip *chip)
259 {
260 	WARN_ON(1);
261 }
262 
263 static inline int devm_gpio_request(struct device *dev, unsigned gpio,
264 				    const char *label)
265 {
266 	WARN_ON(1);
267 	return -EINVAL;
268 }
269 
270 static inline int devm_gpio_request_one(struct device *dev, unsigned gpio,
271 					unsigned long flags, const char *label)
272 {
273 	WARN_ON(1);
274 	return -EINVAL;
275 }
276 
277 static inline void devm_gpio_free(struct device *dev, unsigned int gpio)
278 {
279 	WARN_ON(1);
280 }
281 
282 #endif /* ! CONFIG_GPIOLIB */
283 
284 #endif /* __LINUX_GPIO_H */
285