1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_GPIO_CONSUMER_H
3 #define __LINUX_GPIO_CONSUMER_H
5 #include <linux/bits.h>
7 #include <linux/compiler_types.h>
15 * struct gpio_descs - Struct containing an array of descriptors that can be
16 * obtained using gpiod_get_array()
18 * @info: Pointer to the opaque gpio_array structure
19 * @ndescs: Number of held descriptors
20 * @desc: Array of pointers to GPIO descriptors
23 struct gpio_array *info;
25 struct gpio_desc *desc[];
28 #define GPIOD_FLAGS_BIT_DIR_SET BIT(0)
29 #define GPIOD_FLAGS_BIT_DIR_OUT BIT(1)
30 #define GPIOD_FLAGS_BIT_DIR_VAL BIT(2)
31 #define GPIOD_FLAGS_BIT_OPEN_DRAIN BIT(3)
32 #define GPIOD_FLAGS_BIT_NONEXCLUSIVE BIT(4)
35 * enum gpiod_flags - Optional flags that can be passed to one of gpiod_* to
36 * configure direction and output value. These values
39 * @GPIOD_ASIS: Don't change anything
40 * @GPIOD_IN: Set lines to input mode
41 * @GPIOD_OUT_LOW: Set lines to output and drive them low
42 * @GPIOD_OUT_HIGH: Set lines to output and drive them high
43 * @GPIOD_OUT_LOW_OPEN_DRAIN: Set lines to open-drain output and drive them low
44 * @GPIOD_OUT_HIGH_OPEN_DRAIN: Set lines to open-drain output and drive them high
48 GPIOD_IN = GPIOD_FLAGS_BIT_DIR_SET,
49 GPIOD_OUT_LOW = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT,
50 GPIOD_OUT_HIGH = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
51 GPIOD_FLAGS_BIT_DIR_VAL,
52 GPIOD_OUT_LOW_OPEN_DRAIN = GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_OPEN_DRAIN,
53 GPIOD_OUT_HIGH_OPEN_DRAIN = GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_OPEN_DRAIN,
58 /* Return the number of GPIOs associated with a device / function */
59 int gpiod_count(struct device *dev, const char *con_id);
61 /* Acquire and dispose GPIOs */
62 struct gpio_desc *__must_check gpiod_get(struct device *dev,
64 enum gpiod_flags flags);
65 struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
68 enum gpiod_flags flags);
69 struct gpio_desc *__must_check gpiod_get_optional(struct device *dev,
71 enum gpiod_flags flags);
72 struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev,
75 enum gpiod_flags flags);
76 struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
78 enum gpiod_flags flags);
79 struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev,
81 enum gpiod_flags flags);
82 void gpiod_put(struct gpio_desc *desc);
83 void gpiod_put_array(struct gpio_descs *descs);
85 struct gpio_desc *__must_check devm_gpiod_get(struct device *dev,
87 enum gpiod_flags flags);
88 struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
91 enum gpiod_flags flags);
92 struct gpio_desc *__must_check devm_gpiod_get_optional(struct device *dev,
94 enum gpiod_flags flags);
95 struct gpio_desc *__must_check
96 devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
97 unsigned int index, enum gpiod_flags flags);
98 struct gpio_descs *__must_check devm_gpiod_get_array(struct device *dev,
100 enum gpiod_flags flags);
101 struct gpio_descs *__must_check
102 devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
103 enum gpiod_flags flags);
104 void devm_gpiod_put(struct device *dev, struct gpio_desc *desc);
105 void devm_gpiod_unhinge(struct device *dev, struct gpio_desc *desc);
106 void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs);
108 int gpiod_get_direction(struct gpio_desc *desc);
109 int gpiod_direction_input(struct gpio_desc *desc);
110 int gpiod_direction_output(struct gpio_desc *desc, int value);
111 int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
112 int gpiod_enable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags);
113 int gpiod_disable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags);
115 /* Value get/set from non-sleeping context */
116 int gpiod_get_value(const struct gpio_desc *desc);
117 int gpiod_get_array_value(unsigned int array_size,
118 struct gpio_desc **desc_array,
119 struct gpio_array *array_info,
120 unsigned long *value_bitmap);
121 void gpiod_set_value(struct gpio_desc *desc, int value);
122 int gpiod_set_array_value(unsigned int array_size,
123 struct gpio_desc **desc_array,
124 struct gpio_array *array_info,
125 unsigned long *value_bitmap);
126 int gpiod_get_raw_value(const struct gpio_desc *desc);
127 int gpiod_get_raw_array_value(unsigned int array_size,
128 struct gpio_desc **desc_array,
129 struct gpio_array *array_info,
130 unsigned long *value_bitmap);
131 void gpiod_set_raw_value(struct gpio_desc *desc, int value);
132 int gpiod_set_raw_array_value(unsigned int array_size,
133 struct gpio_desc **desc_array,
134 struct gpio_array *array_info,
135 unsigned long *value_bitmap);
137 /* Value get/set from sleeping context */
138 int gpiod_get_value_cansleep(const struct gpio_desc *desc);
139 int gpiod_get_array_value_cansleep(unsigned int array_size,
140 struct gpio_desc **desc_array,
141 struct gpio_array *array_info,
142 unsigned long *value_bitmap);
143 void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
144 int gpiod_set_array_value_cansleep(unsigned int array_size,
145 struct gpio_desc **desc_array,
146 struct gpio_array *array_info,
147 unsigned long *value_bitmap);
148 int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
149 int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
150 struct gpio_desc **desc_array,
151 struct gpio_array *array_info,
152 unsigned long *value_bitmap);
153 void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
154 int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
155 struct gpio_desc **desc_array,
156 struct gpio_array *array_info,
157 unsigned long *value_bitmap);
159 int gpiod_set_config(struct gpio_desc *desc, unsigned long config);
160 int gpiod_set_debounce(struct gpio_desc *desc, unsigned int debounce);
161 int gpiod_set_transitory(struct gpio_desc *desc, bool transitory);
162 void gpiod_toggle_active_low(struct gpio_desc *desc);
164 int gpiod_is_active_low(const struct gpio_desc *desc);
165 int gpiod_cansleep(const struct gpio_desc *desc);
167 int gpiod_to_irq(const struct gpio_desc *desc);
168 int gpiod_set_consumer_name(struct gpio_desc *desc, const char *name);
170 /* Convert between the old gpio_ and new gpiod_ interfaces */
171 struct gpio_desc *gpio_to_desc(unsigned gpio);
172 int desc_to_gpio(const struct gpio_desc *desc);
174 /* Child properties interface */
175 struct fwnode_handle;
177 struct gpio_desc *fwnode_gpiod_get_index(struct fwnode_handle *fwnode,
178 const char *con_id, int index,
179 enum gpiod_flags flags,
181 struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev,
182 struct fwnode_handle *child,
183 const char *con_id, int index,
184 enum gpiod_flags flags,
187 #else /* CONFIG_GPIOLIB */
189 #include <linux/kernel.h>
191 static inline int gpiod_count(struct device *dev, const char *con_id)
196 static inline struct gpio_desc *__must_check gpiod_get(struct device *dev,
198 enum gpiod_flags flags)
200 return ERR_PTR(-ENOSYS);
202 static inline struct gpio_desc *__must_check
203 gpiod_get_index(struct device *dev,
206 enum gpiod_flags flags)
208 return ERR_PTR(-ENOSYS);
211 static inline struct gpio_desc *__must_check
212 gpiod_get_optional(struct device *dev, const char *con_id,
213 enum gpiod_flags flags)
218 static inline struct gpio_desc *__must_check
219 gpiod_get_index_optional(struct device *dev, const char *con_id,
220 unsigned int index, enum gpiod_flags flags)
225 static inline struct gpio_descs *__must_check
226 gpiod_get_array(struct device *dev, const char *con_id,
227 enum gpiod_flags flags)
229 return ERR_PTR(-ENOSYS);
232 static inline struct gpio_descs *__must_check
233 gpiod_get_array_optional(struct device *dev, const char *con_id,
234 enum gpiod_flags flags)
239 static inline void gpiod_put(struct gpio_desc *desc)
243 /* GPIO can never have been requested */
247 static inline void devm_gpiod_unhinge(struct device *dev,
248 struct gpio_desc *desc)
252 /* GPIO can never have been requested */
256 static inline void gpiod_put_array(struct gpio_descs *descs)
260 /* GPIO can never have been requested */
264 static inline struct gpio_desc *__must_check
265 devm_gpiod_get(struct device *dev,
267 enum gpiod_flags flags)
269 return ERR_PTR(-ENOSYS);
272 struct gpio_desc *__must_check
273 devm_gpiod_get_index(struct device *dev,
276 enum gpiod_flags flags)
278 return ERR_PTR(-ENOSYS);
281 static inline struct gpio_desc *__must_check
282 devm_gpiod_get_optional(struct device *dev, const char *con_id,
283 enum gpiod_flags flags)
288 static inline struct gpio_desc *__must_check
289 devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
290 unsigned int index, enum gpiod_flags flags)
295 static inline struct gpio_descs *__must_check
296 devm_gpiod_get_array(struct device *dev, const char *con_id,
297 enum gpiod_flags flags)
299 return ERR_PTR(-ENOSYS);
302 static inline struct gpio_descs *__must_check
303 devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
304 enum gpiod_flags flags)
309 static inline void devm_gpiod_put(struct device *dev, struct gpio_desc *desc)
313 /* GPIO can never have been requested */
317 static inline void devm_gpiod_put_array(struct device *dev,
318 struct gpio_descs *descs)
322 /* GPIO can never have been requested */
327 static inline int gpiod_get_direction(const struct gpio_desc *desc)
329 /* GPIO can never have been requested */
333 static inline int gpiod_direction_input(struct gpio_desc *desc)
335 /* GPIO can never have been requested */
339 static inline int gpiod_direction_output(struct gpio_desc *desc, int value)
341 /* GPIO can never have been requested */
345 static inline int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
347 /* GPIO can never have been requested */
351 static inline int gpiod_enable_hw_timestamp_ns(struct gpio_desc *desc,
357 static inline int gpiod_disable_hw_timestamp_ns(struct gpio_desc *desc,
363 static inline int gpiod_get_value(const struct gpio_desc *desc)
365 /* GPIO can never have been requested */
369 static inline int gpiod_get_array_value(unsigned int array_size,
370 struct gpio_desc **desc_array,
371 struct gpio_array *array_info,
372 unsigned long *value_bitmap)
374 /* GPIO can never have been requested */
378 static inline void gpiod_set_value(struct gpio_desc *desc, int value)
380 /* GPIO can never have been requested */
383 static inline int gpiod_set_array_value(unsigned int array_size,
384 struct gpio_desc **desc_array,
385 struct gpio_array *array_info,
386 unsigned long *value_bitmap)
388 /* GPIO can never have been requested */
392 static inline int gpiod_get_raw_value(const struct gpio_desc *desc)
394 /* GPIO can never have been requested */
398 static inline int gpiod_get_raw_array_value(unsigned int array_size,
399 struct gpio_desc **desc_array,
400 struct gpio_array *array_info,
401 unsigned long *value_bitmap)
403 /* GPIO can never have been requested */
407 static inline void gpiod_set_raw_value(struct gpio_desc *desc, int value)
409 /* GPIO can never have been requested */
412 static inline int gpiod_set_raw_array_value(unsigned int array_size,
413 struct gpio_desc **desc_array,
414 struct gpio_array *array_info,
415 unsigned long *value_bitmap)
417 /* GPIO can never have been requested */
422 static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc)
424 /* GPIO can never have been requested */
428 static inline int gpiod_get_array_value_cansleep(unsigned int array_size,
429 struct gpio_desc **desc_array,
430 struct gpio_array *array_info,
431 unsigned long *value_bitmap)
433 /* GPIO can never have been requested */
437 static inline void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
439 /* GPIO can never have been requested */
442 static inline int gpiod_set_array_value_cansleep(unsigned int array_size,
443 struct gpio_desc **desc_array,
444 struct gpio_array *array_info,
445 unsigned long *value_bitmap)
447 /* GPIO can never have been requested */
451 static inline int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
453 /* GPIO can never have been requested */
457 static inline int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
458 struct gpio_desc **desc_array,
459 struct gpio_array *array_info,
460 unsigned long *value_bitmap)
462 /* GPIO can never have been requested */
466 static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
469 /* GPIO can never have been requested */
472 static inline int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
473 struct gpio_desc **desc_array,
474 struct gpio_array *array_info,
475 unsigned long *value_bitmap)
477 /* GPIO can never have been requested */
482 static inline int gpiod_set_config(struct gpio_desc *desc, unsigned long config)
484 /* GPIO can never have been requested */
489 static inline int gpiod_set_debounce(struct gpio_desc *desc, unsigned int debounce)
491 /* GPIO can never have been requested */
496 static inline int gpiod_set_transitory(struct gpio_desc *desc, bool transitory)
498 /* GPIO can never have been requested */
503 static inline void gpiod_toggle_active_low(struct gpio_desc *desc)
505 /* GPIO can never have been requested */
509 static inline int gpiod_is_active_low(const struct gpio_desc *desc)
511 /* GPIO can never have been requested */
515 static inline int gpiod_cansleep(const struct gpio_desc *desc)
517 /* GPIO can never have been requested */
522 static inline int gpiod_to_irq(const struct gpio_desc *desc)
524 /* GPIO can never have been requested */
529 static inline int gpiod_set_consumer_name(struct gpio_desc *desc,
532 /* GPIO can never have been requested */
537 static inline struct gpio_desc *gpio_to_desc(unsigned gpio)
542 static inline int desc_to_gpio(const struct gpio_desc *desc)
544 /* GPIO can never have been requested */
549 /* Child properties interface */
550 struct fwnode_handle;
553 struct gpio_desc *fwnode_gpiod_get_index(struct fwnode_handle *fwnode,
554 const char *con_id, int index,
555 enum gpiod_flags flags,
558 return ERR_PTR(-ENOSYS);
562 struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev,
563 struct fwnode_handle *fwnode,
564 const char *con_id, int index,
565 enum gpiod_flags flags,
568 return ERR_PTR(-ENOSYS);
571 #endif /* CONFIG_GPIOLIB */
574 struct gpio_desc *devm_fwnode_gpiod_get(struct device *dev,
575 struct fwnode_handle *fwnode,
577 enum gpiod_flags flags,
580 return devm_fwnode_gpiod_get_index(dev, fwnode, con_id, 0,
585 struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
586 const char *con_id, int index,
587 struct fwnode_handle *child,
588 enum gpiod_flags flags,
591 return devm_fwnode_gpiod_get_index(dev, child, con_id, index,
596 struct gpio_desc *devm_fwnode_get_gpiod_from_child(struct device *dev,
598 struct fwnode_handle *child,
599 enum gpiod_flags flags,
602 return devm_fwnode_gpiod_get_index(dev, child, con_id, 0, flags, label);
605 #if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_OF_GPIO)
608 struct gpio_desc *gpiod_get_from_of_node(const struct device_node *node,
609 const char *propname, int index,
610 enum gpiod_flags dflags,
613 #else /* CONFIG_GPIOLIB && CONFIG_OF_GPIO */
618 struct gpio_desc *gpiod_get_from_of_node(const struct device_node *node,
619 const char *propname, int index,
620 enum gpiod_flags dflags,
623 return ERR_PTR(-ENOSYS);
626 #endif /* CONFIG_GPIOLIB && CONFIG_OF_GPIO */
628 #ifdef CONFIG_GPIOLIB
631 struct gpio_desc *devm_gpiod_get_from_of_node(struct device *dev,
632 const struct device_node *node,
633 const char *propname, int index,
634 enum gpiod_flags dflags,
637 #else /* CONFIG_GPIOLIB */
642 struct gpio_desc *devm_gpiod_get_from_of_node(struct device *dev,
643 const struct device_node *node,
644 const char *propname, int index,
645 enum gpiod_flags dflags,
648 return ERR_PTR(-ENOSYS);
651 #endif /* CONFIG_GPIOLIB */
653 struct acpi_gpio_params {
654 unsigned int crs_entry_index;
655 unsigned int line_index;
659 struct acpi_gpio_mapping {
661 const struct acpi_gpio_params *data;
664 /* Ignore IoRestriction field */
665 #define ACPI_GPIO_QUIRK_NO_IO_RESTRICTION BIT(0)
667 * When ACPI GPIO mapping table is in use the index parameter inside it
668 * refers to the GPIO resource in _CRS method. That index has no
669 * distinction of actual type of the resource. When consumer wants to
670 * get GpioIo type explicitly, this quirk may be used.
672 #define ACPI_GPIO_QUIRK_ONLY_GPIOIO BIT(1)
673 /* Use given pin as an absolute GPIO number in the system */
674 #define ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER BIT(2)
681 #if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_ACPI)
683 int acpi_dev_add_driver_gpios(struct acpi_device *adev,
684 const struct acpi_gpio_mapping *gpios);
685 void acpi_dev_remove_driver_gpios(struct acpi_device *adev);
687 int devm_acpi_dev_add_driver_gpios(struct device *dev,
688 const struct acpi_gpio_mapping *gpios);
690 struct gpio_desc *acpi_get_and_request_gpiod(char *path, unsigned int pin, char *label);
692 #else /* CONFIG_GPIOLIB && CONFIG_ACPI */
694 static inline int acpi_dev_add_driver_gpios(struct acpi_device *adev,
695 const struct acpi_gpio_mapping *gpios)
699 static inline void acpi_dev_remove_driver_gpios(struct acpi_device *adev) {}
701 static inline int devm_acpi_dev_add_driver_gpios(struct device *dev,
702 const struct acpi_gpio_mapping *gpios)
707 static inline struct gpio_desc *acpi_get_and_request_gpiod(char *path, unsigned int pin,
710 return ERR_PTR(-ENOSYS);
713 #endif /* CONFIG_GPIOLIB && CONFIG_ACPI */
716 #if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_GPIO_SYSFS)
718 int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
719 int gpiod_export_link(struct device *dev, const char *name,
720 struct gpio_desc *desc);
721 void gpiod_unexport(struct gpio_desc *desc);
723 #else /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
725 static inline int gpiod_export(struct gpio_desc *desc,
726 bool direction_may_change)
731 static inline int gpiod_export_link(struct device *dev, const char *name,
732 struct gpio_desc *desc)
737 static inline void gpiod_unexport(struct gpio_desc *desc)
741 #endif /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */