1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_GPIO_DRIVER_H
3 #define __LINUX_GPIO_DRIVER_H
5 #include <linux/bits.h>
6 #include <linux/irqchip/chained_irq.h>
7 #include <linux/irqdomain.h>
8 #include <linux/irqhandler.h>
9 #include <linux/lockdep.h>
10 #include <linux/pinctrl/pinconf-generic.h>
11 #include <linux/pinctrl/pinctrl.h>
12 #include <linux/property.h>
13 #include <linux/spinlock_types.h>
14 #include <linux/types.h>
16 #ifdef CONFIG_GENERIC_MSI_IRQ
24 struct of_phandle_args;
32 enum gpio_lookup_flags;
35 union gpio_irq_fwspec {
36 struct irq_fwspec fwspec;
37 #ifdef CONFIG_GENERIC_MSI_IRQ
38 msi_alloc_info_t msiinfo;
42 #define GPIO_LINE_DIRECTION_IN 1
43 #define GPIO_LINE_DIRECTION_OUT 0
46 * struct gpio_irq_chip - GPIO interrupt controller
48 struct gpio_irq_chip {
52 * GPIO IRQ chip implementation, provided by GPIO driver.
54 struct irq_chip *chip;
59 * Interrupt translation domain; responsible for mapping between GPIO
60 * hwirq number and Linux IRQ number.
62 struct irq_domain *domain;
67 * Table of interrupt domain operations for this IRQ chip.
69 const struct irq_domain_ops *domain_ops;
71 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
75 * Firmware node corresponding to this gpiochip/irqchip, necessary
76 * for hierarchical irqdomain support.
78 struct fwnode_handle *fwnode;
83 * If non-NULL, will be set as the parent of this GPIO interrupt
84 * controller's IRQ domain to establish a hierarchical interrupt
85 * domain. The presence of this will activate the hierarchical
88 struct irq_domain *parent_domain;
91 * @child_to_parent_hwirq:
93 * This callback translates a child hardware IRQ offset to a parent
94 * hardware IRQ offset on a hierarchical interrupt chip. The child
95 * hardware IRQs correspond to the GPIO index 0..ngpio-1 (see the
96 * ngpio field of struct gpio_chip) and the corresponding parent
97 * hardware IRQ and type (such as IRQ_TYPE_*) shall be returned by
98 * the driver. The driver can calculate this from an offset or using
99 * a lookup table or whatever method is best for this chip. Return
100 * 0 on successful translation in the driver.
102 * If some ranges of hardware IRQs do not have a corresponding parent
103 * HWIRQ, return -EINVAL, but also make sure to fill in @valid_mask and
104 * @need_valid_mask to make these GPIO lines unavailable for
107 int (*child_to_parent_hwirq)(struct gpio_chip *gc,
108 unsigned int child_hwirq,
109 unsigned int child_type,
110 unsigned int *parent_hwirq,
111 unsigned int *parent_type);
114 * @populate_parent_alloc_arg :
116 * This optional callback allocates and populates the specific struct
117 * for the parent's IRQ domain. If this is not specified, then
118 * &gpiochip_populate_parent_fwspec_twocell will be used. A four-cell
119 * variant named &gpiochip_populate_parent_fwspec_fourcell is also
122 int (*populate_parent_alloc_arg)(struct gpio_chip *gc,
123 union gpio_irq_fwspec *fwspec,
124 unsigned int parent_hwirq,
125 unsigned int parent_type);
128 * @child_offset_to_irq:
130 * This optional callback is used to translate the child's GPIO line
131 * offset on the GPIO chip to an IRQ number for the GPIO to_irq()
132 * callback. If this is not specified, then a default callback will be
133 * provided that returns the line offset.
135 unsigned int (*child_offset_to_irq)(struct gpio_chip *gc,
139 * @child_irq_domain_ops:
141 * The IRQ domain operations that will be used for this GPIO IRQ
142 * chip. If no operations are provided, then default callbacks will
143 * be populated to setup the IRQ hierarchy. Some drivers need to
144 * supply their own translate function.
146 struct irq_domain_ops child_irq_domain_ops;
152 * The IRQ handler to use (often a predefined IRQ core function) for
153 * GPIO IRQs, provided by GPIO driver.
155 irq_flow_handler_t handler;
160 * Default IRQ triggering type applied during GPIO driver
161 * initialization, provided by GPIO driver.
163 unsigned int default_type;
168 * Per GPIO IRQ chip lockdep class for IRQ lock.
170 struct lock_class_key *lock_key;
175 * Per GPIO IRQ chip lockdep class for IRQ request.
177 struct lock_class_key *request_key;
182 * The interrupt handler for the GPIO chip's parent interrupts, may be
183 * NULL if the parent interrupts are nested rather than cascaded.
185 irq_flow_handler_t parent_handler;
189 * @parent_handler_data:
191 * If @per_parent_data is false, @parent_handler_data is a
192 * single pointer used as the data associated with every
195 void *parent_handler_data;
198 * @parent_handler_data_array:
200 * If @per_parent_data is true, @parent_handler_data_array is
201 * an array of @num_parents pointers, and is used to associate
202 * different data for each parent. This cannot be NULL if
203 * @per_parent_data is true.
205 void **parent_handler_data_array;
211 * The number of interrupt parents of a GPIO chip.
213 unsigned int num_parents;
218 * A list of interrupt parents of a GPIO chip. This is owned by the
219 * driver, so the core will only reference this list, not modify it.
221 unsigned int *parents;
226 * A list of interrupt parents for each line of a GPIO chip.
233 * True if set the interrupt handling uses nested threads.
240 * True if parent_handler_data_array describes a @num_parents
241 * sized array to be used as parent data.
243 bool per_parent_data;
248 * Flag to track GPIO chip irq member's initialization.
249 * This flag will make sure GPIO chip irq members are not used
250 * before they are initialized.
255 * @init_hw: optional routine to initialize hardware before
256 * an IRQ chip will be added. This is quite useful when
257 * a particular driver wants to clear IRQ related registers
258 * in order to avoid undesired events.
260 int (*init_hw)(struct gpio_chip *gc);
263 * @init_valid_mask: optional routine to initialize @valid_mask, to be
264 * used if not all GPIO lines are valid interrupts. Sometimes some
265 * lines just cannot fire interrupts, and this routine, when defined,
266 * is passed a bitmap in "valid_mask" and it will have ngpios
267 * bits from 0..(ngpios-1) set to "1" as in valid. The callback can
268 * then directly set some bits to "0" if they cannot be used for
271 void (*init_valid_mask)(struct gpio_chip *gc,
272 unsigned long *valid_mask,
273 unsigned int ngpios);
278 * If not %NULL, holds bitmask of GPIOs which are valid to be included
279 * in IRQ domain of the chip.
281 unsigned long *valid_mask;
286 * Required for static IRQ allocation. If set, irq_domain_add_simple()
287 * will allocate and map all IRQs during initialization.
294 * Store old irq_chip irq_enable callback
296 void (*irq_enable)(struct irq_data *data);
301 * Store old irq_chip irq_disable callback
303 void (*irq_disable)(struct irq_data *data);
307 * Store old irq_chip irq_unmask callback
309 void (*irq_unmask)(struct irq_data *data);
314 * Store old irq_chip irq_mask callback
316 void (*irq_mask)(struct irq_data *data);
320 * struct gpio_chip - abstract a GPIO controller
321 * @label: a functional name for the GPIO device, such as a part
322 * number or the name of the SoC IP-block implementing it.
323 * @gpiodev: the internal state holder, opaque struct
324 * @parent: optional parent device providing the GPIOs
325 * @fwnode: optional fwnode providing this controller's properties
326 * @owner: helps prevent removal of modules exporting active GPIOs
327 * @request: optional hook for chip-specific activation, such as
328 * enabling module power and clock; may sleep
329 * @free: optional hook for chip-specific deactivation, such as
330 * disabling module power and clock; may sleep
331 * @get_direction: returns direction for signal "offset", 0=out, 1=in,
332 * (same as GPIO_LINE_DIRECTION_OUT / GPIO_LINE_DIRECTION_IN),
333 * or negative error. It is recommended to always implement this
334 * function, even on input-only or output-only gpio chips.
335 * @direction_input: configures signal "offset" as input, or returns error
336 * This can be omitted on input-only or output-only gpio chips.
337 * @direction_output: configures signal "offset" as output, or returns error
338 * This can be omitted on input-only or output-only gpio chips.
339 * @get: returns value for signal "offset", 0=low, 1=high, or negative error
340 * @get_multiple: reads values for multiple signals defined by "mask" and
341 * stores them in "bits", returns 0 on success or negative error
342 * @set: assigns output value for signal "offset"
343 * @set_multiple: assigns output values for multiple signals defined by "mask"
344 * @set_config: optional hook for all kinds of settings. Uses the same
345 * packed config format as generic pinconf.
346 * @to_irq: optional hook supporting non-static gpiod_to_irq() mappings;
347 * implementation may not sleep
348 * @dbg_show: optional routine to show contents in debugfs; default code
349 * will be used when this is omitted, but custom code can show extra
350 * state (such as pullup/pulldown configuration).
351 * @init_valid_mask: optional routine to initialize @valid_mask, to be used if
352 * not all GPIOs are valid.
353 * @add_pin_ranges: optional routine to initialize pin ranges, to be used when
354 * requires special mapping of the pins that provides GPIO functionality.
355 * It is called after adding GPIO chip and before adding IRQ chip.
356 * @en_hw_timestamp: Dependent on GPIO chip, an optional routine to
357 * enable hardware timestamp.
358 * @dis_hw_timestamp: Dependent on GPIO chip, an optional routine to
359 * disable hardware timestamp.
360 * @base: identifies the first GPIO number handled by this chip;
361 * or, if negative during registration, requests dynamic ID allocation.
362 * DEPRECATION: providing anything non-negative and nailing the base
363 * offset of GPIO chips is deprecated. Please pass -1 as base to
364 * let gpiolib select the chip base in all possible cases. We want to
365 * get rid of the static GPIO number space in the long run.
366 * @ngpio: the number of GPIOs handled by this controller; the last GPIO
367 * handled is (base + ngpio - 1).
368 * @offset: when multiple gpio chips belong to the same device this
369 * can be used as offset within the device so friendly names can
370 * be properly assigned.
371 * @names: if set, must be an array of strings to use as alternative
372 * names for the GPIOs in this chip. Any entry in the array
373 * may be NULL if there is no alias for the GPIO, however the
374 * array must be @ngpio entries long. A name can include a single printk
375 * format specifier for an unsigned int. It is substituted by the actual
376 * number of the gpio.
377 * @can_sleep: flag must be set iff get()/set() methods sleep, as they
378 * must while accessing GPIO expander chips over I2C or SPI. This
379 * implies that if the chip supports IRQs, these IRQs need to be threaded
380 * as the chip access may sleep when e.g. reading out the IRQ status
382 * @read_reg: reader function for generic GPIO
383 * @write_reg: writer function for generic GPIO
384 * @be_bits: if the generic GPIO has big endian bit order (bit 31 is representing
385 * line 0, bit 30 is line 1 ... bit 0 is line 31) this is set to true by the
386 * generic GPIO core. It is for internal housekeeping only.
387 * @reg_dat: data (in) register for generic GPIO
388 * @reg_set: output set register (out=high) for generic GPIO
389 * @reg_clr: output clear register (out=low) for generic GPIO
390 * @reg_dir_out: direction out setting register for generic GPIO
391 * @reg_dir_in: direction in setting register for generic GPIO
392 * @bgpio_dir_unreadable: indicates that the direction register(s) cannot
393 * be read and we need to rely on out internal state tracking.
394 * @bgpio_bits: number of register bits used for a generic GPIO i.e.
395 * <register width> * 8
396 * @bgpio_lock: used to lock chip->bgpio_data. Also, this is needed to keep
397 * shadowed and real data registers writes together.
398 * @bgpio_data: shadowed data register for generic GPIO to clear/set bits
400 * @bgpio_dir: shadowed direction register for generic GPIO to clear/set
401 * direction safely. A "1" in this word means the line is set as
404 * A gpio_chip can help platforms abstract various sources of GPIOs so
405 * they can all be accessed through a common programming interface.
406 * Example sources would be SOC controllers, FPGAs, multifunction
407 * chips, dedicated GPIO expanders, and so on.
409 * Each chip controls a number of signals, identified in method calls
410 * by "offset" values in the range 0..(@ngpio - 1). When those signals
411 * are referenced through calls like gpio_get_value(gpio), the offset
412 * is calculated by subtracting @base from the gpio number.
416 struct gpio_device *gpiodev;
417 struct device *parent;
418 struct fwnode_handle *fwnode;
419 struct module *owner;
421 int (*request)(struct gpio_chip *gc,
422 unsigned int offset);
423 void (*free)(struct gpio_chip *gc,
424 unsigned int offset);
425 int (*get_direction)(struct gpio_chip *gc,
426 unsigned int offset);
427 int (*direction_input)(struct gpio_chip *gc,
428 unsigned int offset);
429 int (*direction_output)(struct gpio_chip *gc,
430 unsigned int offset, int value);
431 int (*get)(struct gpio_chip *gc,
432 unsigned int offset);
433 int (*get_multiple)(struct gpio_chip *gc,
435 unsigned long *bits);
436 void (*set)(struct gpio_chip *gc,
437 unsigned int offset, int value);
438 void (*set_multiple)(struct gpio_chip *gc,
440 unsigned long *bits);
441 int (*set_config)(struct gpio_chip *gc,
443 unsigned long config);
444 int (*to_irq)(struct gpio_chip *gc,
445 unsigned int offset);
447 void (*dbg_show)(struct seq_file *s,
448 struct gpio_chip *gc);
450 int (*init_valid_mask)(struct gpio_chip *gc,
451 unsigned long *valid_mask,
452 unsigned int ngpios);
454 int (*add_pin_ranges)(struct gpio_chip *gc);
456 int (*en_hw_timestamp)(struct gpio_chip *gc,
458 unsigned long flags);
459 int (*dis_hw_timestamp)(struct gpio_chip *gc,
461 unsigned long flags);
465 const char *const *names;
468 #if IS_ENABLED(CONFIG_GPIO_GENERIC)
469 unsigned long (*read_reg)(void __iomem *reg);
470 void (*write_reg)(void __iomem *reg, unsigned long data);
472 void __iomem *reg_dat;
473 void __iomem *reg_set;
474 void __iomem *reg_clr;
475 void __iomem *reg_dir_out;
476 void __iomem *reg_dir_in;
477 bool bgpio_dir_unreadable;
479 raw_spinlock_t bgpio_lock;
480 unsigned long bgpio_data;
481 unsigned long bgpio_dir;
482 #endif /* CONFIG_GPIO_GENERIC */
484 #ifdef CONFIG_GPIOLIB_IRQCHIP
486 * With CONFIG_GPIOLIB_IRQCHIP we get an irqchip inside the gpiolib
487 * to handle IRQs for most practical cases.
493 * Integrates interrupt chip functionality with the GPIO chip. Can be
494 * used to handle IRQs for most practical cases.
496 struct gpio_irq_chip irq;
497 #endif /* CONFIG_GPIOLIB_IRQCHIP */
502 * If not %NULL, holds bitmask of GPIOs which are valid to be used
505 unsigned long *valid_mask;
507 #if defined(CONFIG_OF_GPIO)
509 * If CONFIG_OF_GPIO is enabled, then all GPIO controllers described in
510 * the device tree automatically may have an OF translation
516 * Number of cells used to form the GPIO specifier.
518 unsigned int of_gpio_n_cells;
523 * Callback to translate a device tree GPIO specifier into a chip-
524 * relative GPIO number and flags.
526 int (*of_xlate)(struct gpio_chip *gc,
527 const struct of_phandle_args *gpiospec, u32 *flags);
528 #endif /* CONFIG_OF_GPIO */
531 extern const char *gpiochip_is_requested(struct gpio_chip *gc,
532 unsigned int offset);
535 * for_each_requested_gpio_in_range - iterates over requested GPIOs in a given range
536 * @chip: the chip to query
538 * @base: first GPIO in the range
539 * @size: amount of GPIOs to check starting from @base
540 * @label: label of current GPIO
542 #define for_each_requested_gpio_in_range(chip, i, base, size, label) \
543 for (i = 0; i < size; i++) \
544 if ((label = gpiochip_is_requested(chip, base + i)) == NULL) {} else
546 /* Iterates over all requested GPIO of the given @chip */
547 #define for_each_requested_gpio(chip, i, label) \
548 for_each_requested_gpio_in_range(chip, i, 0, chip->ngpio, label)
550 /* add/remove chips */
551 extern int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
552 struct lock_class_key *lock_key,
553 struct lock_class_key *request_key);
556 * gpiochip_add_data() - register a gpio_chip
557 * @gc: the chip to register, with gc->base initialized
558 * @data: driver-private data associated with this chip
560 * Context: potentially before irqs will work
562 * When gpiochip_add_data() is called very early during boot, so that GPIOs
563 * can be freely used, the gc->parent device must be registered before
564 * the gpio framework's arch_initcall(). Otherwise sysfs initialization
565 * for GPIOs will fail rudely.
567 * gpiochip_add_data() must only be called after gpiolib initialization,
568 * i.e. after core_initcall().
570 * If gc->base is negative, this requests dynamic assignment of
571 * a range of valid GPIOs.
574 * A negative errno if the chip can't be registered, such as because the
575 * gc->base is invalid or already associated with a different chip.
576 * Otherwise it returns zero as a success code.
578 #ifdef CONFIG_LOCKDEP
579 #define gpiochip_add_data(gc, data) ({ \
580 static struct lock_class_key lock_key; \
581 static struct lock_class_key request_key; \
582 gpiochip_add_data_with_key(gc, data, &lock_key, \
585 #define devm_gpiochip_add_data(dev, gc, data) ({ \
586 static struct lock_class_key lock_key; \
587 static struct lock_class_key request_key; \
588 devm_gpiochip_add_data_with_key(dev, gc, data, &lock_key, \
592 #define gpiochip_add_data(gc, data) gpiochip_add_data_with_key(gc, data, NULL, NULL)
593 #define devm_gpiochip_add_data(dev, gc, data) \
594 devm_gpiochip_add_data_with_key(dev, gc, data, NULL, NULL)
595 #endif /* CONFIG_LOCKDEP */
597 static inline int gpiochip_add(struct gpio_chip *gc)
599 return gpiochip_add_data(gc, NULL);
601 extern void gpiochip_remove(struct gpio_chip *gc);
602 extern int devm_gpiochip_add_data_with_key(struct device *dev, struct gpio_chip *gc, void *data,
603 struct lock_class_key *lock_key,
604 struct lock_class_key *request_key);
606 extern struct gpio_chip *gpiochip_find(void *data,
607 int (*match)(struct gpio_chip *gc, void *data));
609 bool gpiochip_line_is_irq(struct gpio_chip *gc, unsigned int offset);
610 int gpiochip_reqres_irq(struct gpio_chip *gc, unsigned int offset);
611 void gpiochip_relres_irq(struct gpio_chip *gc, unsigned int offset);
612 void gpiochip_disable_irq(struct gpio_chip *gc, unsigned int offset);
613 void gpiochip_enable_irq(struct gpio_chip *gc, unsigned int offset);
615 /* irq_data versions of the above */
616 int gpiochip_irq_reqres(struct irq_data *data);
617 void gpiochip_irq_relres(struct irq_data *data);
619 /* Paste this in your irq_chip structure */
620 #define GPIOCHIP_IRQ_RESOURCE_HELPERS \
621 .irq_request_resources = gpiochip_irq_reqres, \
622 .irq_release_resources = gpiochip_irq_relres
624 static inline void gpio_irq_chip_set_chip(struct gpio_irq_chip *girq,
625 const struct irq_chip *chip)
627 /* Yes, dropping const is ugly, but it isn't like we have a choice */
628 girq->chip = (struct irq_chip *)chip;
631 /* Line status inquiry for drivers */
632 bool gpiochip_line_is_open_drain(struct gpio_chip *gc, unsigned int offset);
633 bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset);
635 /* Sleep persistence inquiry for drivers */
636 bool gpiochip_line_is_persistent(struct gpio_chip *gc, unsigned int offset);
637 bool gpiochip_line_is_valid(const struct gpio_chip *gc, unsigned int offset);
639 /* get driver data */
640 void *gpiochip_get_data(struct gpio_chip *gc);
648 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
650 int gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *gc,
651 union gpio_irq_fwspec *gfwspec,
652 unsigned int parent_hwirq,
653 unsigned int parent_type);
654 int gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *gc,
655 union gpio_irq_fwspec *gfwspec,
656 unsigned int parent_hwirq,
657 unsigned int parent_type);
659 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
661 int bgpio_init(struct gpio_chip *gc, struct device *dev,
662 unsigned long sz, void __iomem *dat, void __iomem *set,
663 void __iomem *clr, void __iomem *dirout, void __iomem *dirin,
664 unsigned long flags);
666 #define BGPIOF_BIG_ENDIAN BIT(0)
667 #define BGPIOF_UNREADABLE_REG_SET BIT(1) /* reg_set is unreadable */
668 #define BGPIOF_UNREADABLE_REG_DIR BIT(2) /* reg_dir is unreadable */
669 #define BGPIOF_BIG_ENDIAN_BYTE_ORDER BIT(3)
670 #define BGPIOF_READ_OUTPUT_REG_SET BIT(4) /* reg_set stores output value */
671 #define BGPIOF_NO_OUTPUT BIT(5) /* only input */
672 #define BGPIOF_NO_SET_ON_INPUT BIT(6)
674 int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
675 irq_hw_number_t hwirq);
676 void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq);
678 int gpiochip_irq_domain_activate(struct irq_domain *domain,
679 struct irq_data *data, bool reserve);
680 void gpiochip_irq_domain_deactivate(struct irq_domain *domain,
681 struct irq_data *data);
683 bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gc,
684 unsigned int offset);
686 #ifdef CONFIG_GPIOLIB_IRQCHIP
687 int gpiochip_irqchip_add_domain(struct gpio_chip *gc,
688 struct irq_domain *domain);
692 #include <asm/errno.h>
694 static inline int gpiochip_irqchip_add_domain(struct gpio_chip *gc,
695 struct irq_domain *domain)
702 int gpiochip_generic_request(struct gpio_chip *gc, unsigned int offset);
703 void gpiochip_generic_free(struct gpio_chip *gc, unsigned int offset);
704 int gpiochip_generic_config(struct gpio_chip *gc, unsigned int offset,
705 unsigned long config);
708 * struct gpio_pin_range - pin range controlled by a gpio chip
709 * @node: list for maintaining set of pin ranges, used internally
710 * @pctldev: pinctrl device which handles corresponding pins
711 * @range: actual range of pins controlled by a gpio controller
713 struct gpio_pin_range {
714 struct list_head node;
715 struct pinctrl_dev *pctldev;
716 struct pinctrl_gpio_range range;
719 #ifdef CONFIG_PINCTRL
721 int gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
722 unsigned int gpio_offset, unsigned int pin_offset,
724 int gpiochip_add_pingroup_range(struct gpio_chip *gc,
725 struct pinctrl_dev *pctldev,
726 unsigned int gpio_offset, const char *pin_group);
727 void gpiochip_remove_pin_ranges(struct gpio_chip *gc);
729 #else /* ! CONFIG_PINCTRL */
732 gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
733 unsigned int gpio_offset, unsigned int pin_offset,
739 gpiochip_add_pingroup_range(struct gpio_chip *gc,
740 struct pinctrl_dev *pctldev,
741 unsigned int gpio_offset, const char *pin_group)
747 gpiochip_remove_pin_ranges(struct gpio_chip *gc)
751 #endif /* CONFIG_PINCTRL */
753 struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc,
756 enum gpio_lookup_flags lflags,
757 enum gpiod_flags dflags);
758 void gpiochip_free_own_desc(struct gpio_desc *desc);
760 #ifdef CONFIG_GPIOLIB
762 /* lock/unlock as IRQ */
763 int gpiochip_lock_as_irq(struct gpio_chip *gc, unsigned int offset);
764 void gpiochip_unlock_as_irq(struct gpio_chip *gc, unsigned int offset);
767 struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
769 #else /* CONFIG_GPIOLIB */
771 #include <linux/err.h>
775 static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
777 /* GPIO can never have been requested */
779 return ERR_PTR(-ENODEV);
782 static inline int gpiochip_lock_as_irq(struct gpio_chip *gc,
789 static inline void gpiochip_unlock_as_irq(struct gpio_chip *gc,
794 #endif /* CONFIG_GPIOLIB */
796 #define for_each_gpiochip_node(dev, child) \
797 device_for_each_child_node(dev, child) \
798 if (!fwnode_property_present(child, "gpio-controller")) {} else
800 static inline unsigned int gpiochip_node_count(struct device *dev)
802 struct fwnode_handle *child;
803 unsigned int count = 0;
805 for_each_gpiochip_node(dev, child)
811 static inline struct fwnode_handle *gpiochip_node_get_first(struct device *dev)
813 struct fwnode_handle *fwnode;
815 for_each_gpiochip_node(dev, fwnode)
821 #endif /* __LINUX_GPIO_DRIVER_H */