1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_GPIO_CONSUMER_H
3 #define __LINUX_GPIO_CONSUMER_H
7 #include <linux/kernel.h>
12 * Opaque descriptor for a GPIO. These are obtained using gpiod_get() and are
13 * preferable to the old integer-based handles.
15 * Contrary to integers, a pointer to a gpio_desc is guaranteed to be valid
16 * until the GPIO is released.
21 * Struct containing an array of descriptors that can be obtained using
26 struct gpio_desc *desc[];
29 #define GPIOD_FLAGS_BIT_DIR_SET BIT(0)
30 #define GPIOD_FLAGS_BIT_DIR_OUT BIT(1)
31 #define GPIOD_FLAGS_BIT_DIR_VAL BIT(2)
32 #define GPIOD_FLAGS_BIT_OPEN_DRAIN BIT(3)
35 * Optional flags that can be passed to one of gpiod_* to configure direction
36 * and output value. These values cannot be OR'd.
40 GPIOD_IN = GPIOD_FLAGS_BIT_DIR_SET,
41 GPIOD_OUT_LOW = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT,
42 GPIOD_OUT_HIGH = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
43 GPIOD_FLAGS_BIT_DIR_VAL,
44 GPIOD_OUT_LOW_OPEN_DRAIN = GPIOD_FLAGS_BIT_DIR_SET |
45 GPIOD_FLAGS_BIT_DIR_OUT | GPIOD_FLAGS_BIT_OPEN_DRAIN,
46 GPIOD_OUT_HIGH_OPEN_DRAIN = GPIOD_FLAGS_BIT_DIR_SET |
47 GPIOD_FLAGS_BIT_DIR_OUT | GPIOD_FLAGS_BIT_DIR_VAL |
48 GPIOD_FLAGS_BIT_OPEN_DRAIN,
53 /* Return the number of GPIOs associated with a device / function */
54 int gpiod_count(struct device *dev, const char *con_id);
56 /* Acquire and dispose GPIOs */
57 struct gpio_desc *__must_check gpiod_get(struct device *dev,
59 enum gpiod_flags flags);
60 struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
63 enum gpiod_flags flags);
64 struct gpio_desc *__must_check gpiod_get_optional(struct device *dev,
66 enum gpiod_flags flags);
67 struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev,
70 enum gpiod_flags flags);
71 struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
73 enum gpiod_flags flags);
74 struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev,
76 enum gpiod_flags flags);
77 void gpiod_put(struct gpio_desc *desc);
78 void gpiod_put_array(struct gpio_descs *descs);
80 struct gpio_desc *__must_check devm_gpiod_get(struct device *dev,
82 enum gpiod_flags flags);
83 struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
86 enum gpiod_flags flags);
87 struct gpio_desc *__must_check devm_gpiod_get_optional(struct device *dev,
89 enum gpiod_flags flags);
90 struct gpio_desc *__must_check
91 devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
92 unsigned int index, enum gpiod_flags flags);
93 struct gpio_descs *__must_check devm_gpiod_get_array(struct device *dev,
95 enum gpiod_flags flags);
96 struct gpio_descs *__must_check
97 devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
98 enum gpiod_flags flags);
99 void devm_gpiod_put(struct device *dev, struct gpio_desc *desc);
100 void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs);
102 int gpiod_get_direction(struct gpio_desc *desc);
103 int gpiod_direction_input(struct gpio_desc *desc);
104 int gpiod_direction_output(struct gpio_desc *desc, int value);
105 int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
107 /* Value get/set from non-sleeping context */
108 int gpiod_get_value(const struct gpio_desc *desc);
109 int gpiod_get_array_value(unsigned int array_size,
110 struct gpio_desc **desc_array, int *value_array);
111 void gpiod_set_value(struct gpio_desc *desc, int value);
112 void gpiod_set_array_value(unsigned int array_size,
113 struct gpio_desc **desc_array, int *value_array);
114 int gpiod_get_raw_value(const struct gpio_desc *desc);
115 int gpiod_get_raw_array_value(unsigned int array_size,
116 struct gpio_desc **desc_array,
118 void gpiod_set_raw_value(struct gpio_desc *desc, int value);
119 int gpiod_set_raw_array_value(unsigned int array_size,
120 struct gpio_desc **desc_array,
123 /* Value get/set from sleeping context */
124 int gpiod_get_value_cansleep(const struct gpio_desc *desc);
125 int gpiod_get_array_value_cansleep(unsigned int array_size,
126 struct gpio_desc **desc_array,
128 void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
129 void gpiod_set_array_value_cansleep(unsigned int array_size,
130 struct gpio_desc **desc_array,
132 int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
133 int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
134 struct gpio_desc **desc_array,
136 void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
137 int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
138 struct gpio_desc **desc_array,
141 int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
142 int gpiod_set_transitory(struct gpio_desc *desc, bool transitory);
144 int gpiod_is_active_low(const struct gpio_desc *desc);
145 int gpiod_cansleep(const struct gpio_desc *desc);
147 int gpiod_to_irq(const struct gpio_desc *desc);
149 /* Convert between the old gpio_ and new gpiod_ interfaces */
150 struct gpio_desc *gpio_to_desc(unsigned gpio);
151 int desc_to_gpio(const struct gpio_desc *desc);
153 /* Child properties interface */
155 struct fwnode_handle;
157 struct gpio_desc *devm_gpiod_get_from_of_node(struct device *dev,
158 struct device_node *node,
159 const char *propname, int index,
160 enum gpiod_flags dflags,
162 struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
163 const char *propname, int index,
164 enum gpiod_flags dflags,
166 struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
167 const char *con_id, int index,
168 struct fwnode_handle *child,
169 enum gpiod_flags flags,
172 #else /* CONFIG_GPIOLIB */
174 static inline int gpiod_count(struct device *dev, const char *con_id)
179 static inline struct gpio_desc *__must_check gpiod_get(struct device *dev,
181 enum gpiod_flags flags)
183 return ERR_PTR(-ENOSYS);
185 static inline struct gpio_desc *__must_check
186 gpiod_get_index(struct device *dev,
189 enum gpiod_flags flags)
191 return ERR_PTR(-ENOSYS);
194 static inline struct gpio_desc *__must_check
195 gpiod_get_optional(struct device *dev, const char *con_id,
196 enum gpiod_flags flags)
201 static inline struct gpio_desc *__must_check
202 gpiod_get_index_optional(struct device *dev, const char *con_id,
203 unsigned int index, enum gpiod_flags flags)
208 static inline struct gpio_descs *__must_check
209 gpiod_get_array(struct device *dev, const char *con_id,
210 enum gpiod_flags flags)
212 return ERR_PTR(-ENOSYS);
215 static inline struct gpio_descs *__must_check
216 gpiod_get_array_optional(struct device *dev, const char *con_id,
217 enum gpiod_flags flags)
222 static inline void gpiod_put(struct gpio_desc *desc)
226 /* GPIO can never have been requested */
230 static inline void gpiod_put_array(struct gpio_descs *descs)
234 /* GPIO can never have been requested */
238 static inline struct gpio_desc *__must_check
239 devm_gpiod_get(struct device *dev,
241 enum gpiod_flags flags)
243 return ERR_PTR(-ENOSYS);
246 struct gpio_desc *__must_check
247 devm_gpiod_get_index(struct device *dev,
250 enum gpiod_flags flags)
252 return ERR_PTR(-ENOSYS);
255 static inline struct gpio_desc *__must_check
256 devm_gpiod_get_optional(struct device *dev, const char *con_id,
257 enum gpiod_flags flags)
262 static inline struct gpio_desc *__must_check
263 devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
264 unsigned int index, enum gpiod_flags flags)
269 static inline struct gpio_descs *__must_check
270 devm_gpiod_get_array(struct device *dev, const char *con_id,
271 enum gpiod_flags flags)
273 return ERR_PTR(-ENOSYS);
276 static inline struct gpio_descs *__must_check
277 devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
278 enum gpiod_flags flags)
283 static inline void devm_gpiod_put(struct device *dev, struct gpio_desc *desc)
287 /* GPIO can never have been requested */
291 static inline void devm_gpiod_put_array(struct device *dev,
292 struct gpio_descs *descs)
296 /* GPIO can never have been requested */
301 static inline int gpiod_get_direction(const struct gpio_desc *desc)
303 /* GPIO can never have been requested */
307 static inline int gpiod_direction_input(struct gpio_desc *desc)
309 /* GPIO can never have been requested */
313 static inline int gpiod_direction_output(struct gpio_desc *desc, int value)
315 /* GPIO can never have been requested */
319 static inline int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
321 /* GPIO can never have been requested */
327 static inline int gpiod_get_value(const struct gpio_desc *desc)
329 /* GPIO can never have been requested */
333 static inline int gpiod_get_array_value(unsigned int array_size,
334 struct gpio_desc **desc_array,
337 /* GPIO can never have been requested */
341 static inline void gpiod_set_value(struct gpio_desc *desc, int value)
343 /* GPIO can never have been requested */
346 static inline void gpiod_set_array_value(unsigned int array_size,
347 struct gpio_desc **desc_array,
350 /* GPIO can never have been requested */
353 static inline int gpiod_get_raw_value(const struct gpio_desc *desc)
355 /* GPIO can never have been requested */
359 static inline int gpiod_get_raw_array_value(unsigned int array_size,
360 struct gpio_desc **desc_array,
363 /* GPIO can never have been requested */
367 static inline void gpiod_set_raw_value(struct gpio_desc *desc, int value)
369 /* GPIO can never have been requested */
372 static inline int gpiod_set_raw_array_value(unsigned int array_size,
373 struct gpio_desc **desc_array,
376 /* GPIO can never have been requested */
381 static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc)
383 /* GPIO can never have been requested */
387 static inline int gpiod_get_array_value_cansleep(unsigned int array_size,
388 struct gpio_desc **desc_array,
391 /* GPIO can never have been requested */
395 static inline void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
397 /* GPIO can never have been requested */
400 static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
401 struct gpio_desc **desc_array,
404 /* GPIO can never have been requested */
407 static inline int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
409 /* GPIO can never have been requested */
413 static inline int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
414 struct gpio_desc **desc_array,
417 /* GPIO can never have been requested */
421 static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
424 /* GPIO can never have been requested */
427 static inline int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
428 struct gpio_desc **desc_array,
431 /* GPIO can never have been requested */
436 static inline int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
438 /* GPIO can never have been requested */
443 static inline int gpiod_set_transitory(struct gpio_desc *desc, bool transitory)
445 /* GPIO can never have been requested */
450 static inline int gpiod_is_active_low(const struct gpio_desc *desc)
452 /* GPIO can never have been requested */
456 static inline int gpiod_cansleep(const struct gpio_desc *desc)
458 /* GPIO can never have been requested */
463 static inline int gpiod_to_irq(const struct gpio_desc *desc)
465 /* GPIO can never have been requested */
470 static inline struct gpio_desc *gpio_to_desc(unsigned gpio)
472 return ERR_PTR(-EINVAL);
475 static inline int desc_to_gpio(const struct gpio_desc *desc)
477 /* GPIO can never have been requested */
482 /* Child properties interface */
484 struct fwnode_handle;
487 struct gpio_desc *devm_gpiod_get_from_of_node(struct device *dev,
488 struct device_node *node,
489 const char *propname, int index,
490 enum gpiod_flags dflags,
493 return ERR_PTR(-ENOSYS);
497 struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
498 const char *propname, int index,
499 enum gpiod_flags dflags,
502 return ERR_PTR(-ENOSYS);
506 struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
507 const char *con_id, int index,
508 struct fwnode_handle *child,
509 enum gpiod_flags flags,
512 return ERR_PTR(-ENOSYS);
515 #endif /* CONFIG_GPIOLIB */
518 struct gpio_desc *devm_fwnode_get_gpiod_from_child(struct device *dev,
520 struct fwnode_handle *child,
521 enum gpiod_flags flags,
524 return devm_fwnode_get_index_gpiod_from_child(dev, con_id, 0, child,
528 #if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_GPIO_SYSFS)
530 int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
531 int gpiod_export_link(struct device *dev, const char *name,
532 struct gpio_desc *desc);
533 void gpiod_unexport(struct gpio_desc *desc);
535 #else /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
537 static inline int gpiod_export(struct gpio_desc *desc,
538 bool direction_may_change)
543 static inline int gpiod_export_link(struct device *dev, const char *name,
544 struct gpio_desc *desc)
549 static inline void gpiod_unexport(struct gpio_desc *desc)
553 #endif /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */