linux/include/linux/gpio/machine.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_GPIO_MACHINE_H
#define __LINUX_GPIO_MACHINE_H

#include <linux/types.h>

enum gpio_lookup_flags { … };

/**
 * struct gpiod_lookup - lookup table
 * @key: either the name of the chip the GPIO belongs to, or the GPIO line name
 *       Note that GPIO line names are not guaranteed to be globally unique,
 *       so this will use the first match found!
 * @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO, or
 *              U16_MAX to indicate that @key is a GPIO line name
 * @con_id: name of the GPIO from the device's point of view
 * @idx: index of the GPIO in case several GPIOs share the same name
 * @flags: bitmask of gpio_lookup_flags GPIO_* values
 *
 * gpiod_lookup is a lookup table for associating GPIOs to specific devices and
 * functions using platform data.
 */
struct gpiod_lookup { … };

struct gpiod_lookup_table { … };

/**
 * struct gpiod_hog - GPIO line hog table
 * @chip_label: name of the chip the GPIO belongs to
 * @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO
 * @line_name: consumer name for the hogged line
 * @lflags: bitmask of gpio_lookup_flags GPIO_* values
 * @dflags: GPIO flags used to specify the direction and value
 */
struct gpiod_hog { … };

/*
 * Helper for lookup tables with just one single lookup for a device.
 */
#define GPIO_LOOKUP_SINGLE(_name, _dev_id, _key, _chip_hwnum, _con_id, _flags) …

/*
 * Simple definition of a single GPIO under a con_id
 */
#define GPIO_LOOKUP(_key, _chip_hwnum, _con_id, _flags) …

/*
 * Use this macro if you need to have several GPIOs under the same con_id.
 * Each GPIO needs to use a different index and can be accessed using
 * gpiod_get_index()
 */
#define GPIO_LOOKUP_IDX(_key, _chip_hwnum, _con_id, _idx, _flags) …

/*
 * Simple definition of a single GPIO hog in an array.
 */
#define GPIO_HOG(_chip_label, _chip_hwnum, _line_name, _lflags, _dflags) …

#ifdef CONFIG_GPIOLIB
void gpiod_add_lookup_table(struct gpiod_lookup_table *table);
void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n);
void gpiod_remove_lookup_table(struct gpiod_lookup_table *table);
void gpiod_add_hogs(struct gpiod_hog *hogs);
void gpiod_remove_hogs(struct gpiod_hog *hogs);
#else /* ! CONFIG_GPIOLIB */
static inline
void gpiod_add_lookup_table(struct gpiod_lookup_table *table) {}
static inline
void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) {}
static inline
void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) {}
static inline void gpiod_add_hogs(struct gpiod_hog *hogs) {}
static inline void gpiod_remove_hogs(struct gpiod_hog *hogs) {}
#endif /* CONFIG_GPIOLIB */

#endif /* __LINUX_GPIO_MACHINE_H */