1 #ifndef __LINUX_GPIO_CONSUMER_H
2 #define __LINUX_GPIO_CONSUMER_H
6 #include <linux/kernel.h>
11 * Opaque descriptor for a GPIO. These are obtained using gpiod_get() and are
12 * preferable to the old integer-based handles.
14 * Contrary to integers, a pointer to a gpio_desc is guaranteed to be valid
15 * until the GPIO is released.
19 #define GPIOD_FLAGS_BIT_DIR_SET BIT(0)
20 #define GPIOD_FLAGS_BIT_DIR_OUT BIT(1)
21 #define GPIOD_FLAGS_BIT_DIR_VAL BIT(2)
24 * Optional flags that can be passed to one of gpiod_* to configure direction
25 * and output value. These values cannot be OR'd.
29 GPIOD_IN = GPIOD_FLAGS_BIT_DIR_SET,
30 GPIOD_OUT_LOW = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT,
31 GPIOD_OUT_HIGH = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
32 GPIOD_FLAGS_BIT_DIR_VAL,
37 /* Acquire and dispose GPIOs */
38 struct gpio_desc *__must_check __gpiod_get(struct device *dev,
40 enum gpiod_flags flags);
41 struct gpio_desc *__must_check __gpiod_get_index(struct device *dev,
44 enum gpiod_flags flags);
45 struct gpio_desc *__must_check __gpiod_get_optional(struct device *dev,
47 enum gpiod_flags flags);
48 struct gpio_desc *__must_check __gpiod_get_index_optional(struct device *dev,
51 enum gpiod_flags flags);
52 void gpiod_put(struct gpio_desc *desc);
54 struct gpio_desc *__must_check __devm_gpiod_get(struct device *dev,
56 enum gpiod_flags flags);
57 struct gpio_desc *__must_check __devm_gpiod_get_index(struct device *dev,
60 enum gpiod_flags flags);
61 struct gpio_desc *__must_check __devm_gpiod_get_optional(struct device *dev,
63 enum gpiod_flags flags);
64 struct gpio_desc *__must_check
65 __devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
66 unsigned int index, enum gpiod_flags flags);
67 void devm_gpiod_put(struct device *dev, struct gpio_desc *desc);
69 int gpiod_get_direction(const struct gpio_desc *desc);
70 int gpiod_direction_input(struct gpio_desc *desc);
71 int gpiod_direction_output(struct gpio_desc *desc, int value);
72 int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
74 /* Value get/set from non-sleeping context */
75 int gpiod_get_value(const struct gpio_desc *desc);
76 void gpiod_set_value(struct gpio_desc *desc, int value);
77 int gpiod_get_raw_value(const struct gpio_desc *desc);
78 void gpiod_set_raw_value(struct gpio_desc *desc, int value);
80 /* Value get/set from sleeping context */
81 int gpiod_get_value_cansleep(const struct gpio_desc *desc);
82 void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
83 int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
84 void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
86 int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
88 int gpiod_is_active_low(const struct gpio_desc *desc);
89 int gpiod_cansleep(const struct gpio_desc *desc);
91 int gpiod_to_irq(const struct gpio_desc *desc);
93 /* Convert between the old gpio_ and new gpiod_ interfaces */
94 struct gpio_desc *gpio_to_desc(unsigned gpio);
95 int desc_to_gpio(const struct gpio_desc *desc);
97 /* Child properties interface */
100 struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
101 const char *propname);
102 struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
103 struct fwnode_handle *child);
104 #else /* CONFIG_GPIOLIB */
106 static inline struct gpio_desc *__must_check __gpiod_get(struct device *dev,
108 enum gpiod_flags flags)
110 return ERR_PTR(-ENOSYS);
112 static inline struct gpio_desc *__must_check
113 __gpiod_get_index(struct device *dev,
116 enum gpiod_flags flags)
118 return ERR_PTR(-ENOSYS);
121 static inline struct gpio_desc *__must_check
122 __gpiod_get_optional(struct device *dev, const char *con_id,
123 enum gpiod_flags flags)
125 return ERR_PTR(-ENOSYS);
128 static inline struct gpio_desc *__must_check
129 __gpiod_get_index_optional(struct device *dev, const char *con_id,
130 unsigned int index, enum gpiod_flags flags)
132 return ERR_PTR(-ENOSYS);
135 static inline void gpiod_put(struct gpio_desc *desc)
139 /* GPIO can never have been requested */
143 static inline struct gpio_desc *__must_check
144 __devm_gpiod_get(struct device *dev,
146 enum gpiod_flags flags)
148 return ERR_PTR(-ENOSYS);
151 struct gpio_desc *__must_check
152 __devm_gpiod_get_index(struct device *dev,
155 enum gpiod_flags flags)
157 return ERR_PTR(-ENOSYS);
160 static inline struct gpio_desc *__must_check
161 __devm_gpiod_get_optional(struct device *dev, const char *con_id,
162 enum gpiod_flags flags)
164 return ERR_PTR(-ENOSYS);
167 static inline struct gpio_desc *__must_check
168 __devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
169 unsigned int index, enum gpiod_flags flags)
171 return ERR_PTR(-ENOSYS);
174 static inline void devm_gpiod_put(struct device *dev, struct gpio_desc *desc)
178 /* GPIO can never have been requested */
183 static inline int gpiod_get_direction(const struct gpio_desc *desc)
185 /* GPIO can never have been requested */
189 static inline int gpiod_direction_input(struct gpio_desc *desc)
191 /* GPIO can never have been requested */
195 static inline int gpiod_direction_output(struct gpio_desc *desc, int value)
197 /* GPIO can never have been requested */
201 static inline int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
203 /* GPIO can never have been requested */
209 static inline int gpiod_get_value(const struct gpio_desc *desc)
211 /* GPIO can never have been requested */
215 static inline void gpiod_set_value(struct gpio_desc *desc, int value)
217 /* GPIO can never have been requested */
220 static inline int gpiod_get_raw_value(const struct gpio_desc *desc)
222 /* GPIO can never have been requested */
226 static inline void gpiod_set_raw_value(struct gpio_desc *desc, int value)
228 /* GPIO can never have been requested */
232 static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc)
234 /* GPIO can never have been requested */
238 static inline void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
240 /* GPIO can never have been requested */
243 static inline int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
245 /* GPIO can never have been requested */
249 static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
252 /* GPIO can never have been requested */
256 static inline int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
258 /* GPIO can never have been requested */
263 static inline int gpiod_is_active_low(const struct gpio_desc *desc)
265 /* GPIO can never have been requested */
269 static inline int gpiod_cansleep(const struct gpio_desc *desc)
271 /* GPIO can never have been requested */
276 static inline int gpiod_to_irq(const struct gpio_desc *desc)
278 /* GPIO can never have been requested */
283 static inline struct gpio_desc *gpio_to_desc(unsigned gpio)
285 return ERR_PTR(-EINVAL);
287 static inline int desc_to_gpio(const struct gpio_desc *desc)
289 /* GPIO can never have been requested */
294 #endif /* CONFIG_GPIOLIB */
297 * Vararg-hacks! This is done to transition the kernel to always pass
298 * the options flags argument to the below functions. During a transition
299 * phase these vararg macros make both old-and-newstyle code compile,
300 * but when all calls to the elder API are removed, these should go away
301 * and the __gpiod_get() etc functions above be renamed just gpiod_get()
304 #define __gpiod_get(dev, con_id, flags, ...) __gpiod_get(dev, con_id, flags)
305 #define gpiod_get(varargs...) __gpiod_get(varargs, 0)
306 #define __gpiod_get_index(dev, con_id, index, flags, ...) \
307 __gpiod_get_index(dev, con_id, index, flags)
308 #define gpiod_get_index(varargs...) __gpiod_get_index(varargs, 0)
309 #define __gpiod_get_optional(dev, con_id, flags, ...) \
310 __gpiod_get_optional(dev, con_id, flags)
311 #define gpiod_get_optional(varargs...) __gpiod_get_optional(varargs, 0)
312 #define __gpiod_get_index_optional(dev, con_id, index, flags, ...) \
313 __gpiod_get_index_optional(dev, con_id, index, flags)
314 #define gpiod_get_index_optional(varargs...) \
315 __gpiod_get_index_optional(varargs, 0)
316 #define __devm_gpiod_get(dev, con_id, flags, ...) \
317 __devm_gpiod_get(dev, con_id, flags)
318 #define devm_gpiod_get(varargs...) __devm_gpiod_get(varargs, 0)
319 #define __devm_gpiod_get_index(dev, con_id, index, flags, ...) \
320 __devm_gpiod_get_index(dev, con_id, index, flags)
321 #define devm_gpiod_get_index(varargs...) __devm_gpiod_get_index(varargs, 0)
322 #define __devm_gpiod_get_optional(dev, con_id, flags, ...) \
323 __devm_gpiod_get_optional(dev, con_id, flags)
324 #define devm_gpiod_get_optional(varargs...) \
325 __devm_gpiod_get_optional(varargs, 0)
326 #define __devm_gpiod_get_index_optional(dev, con_id, index, flags, ...) \
327 __devm_gpiod_get_index_optional(dev, con_id, index, flags)
328 #define devm_gpiod_get_index_optional(varargs...) \
329 __devm_gpiod_get_index_optional(varargs, 0)
331 #if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_GPIO_SYSFS)
333 int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
334 int gpiod_export_link(struct device *dev, const char *name,
335 struct gpio_desc *desc);
336 int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value);
337 void gpiod_unexport(struct gpio_desc *desc);
339 #else /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
341 static inline int gpiod_export(struct gpio_desc *desc,
342 bool direction_may_change)
347 static inline int gpiod_export_link(struct device *dev, const char *name,
348 struct gpio_desc *desc)
353 static inline int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)
358 static inline void gpiod_unexport(struct gpio_desc *desc)
362 #endif /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */