Release 4.17 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>
#include <linux/list.h>


enum gpio_lookup_flags {
	
GPIO_ACTIVE_HIGH = (0 << 0),
	
GPIO_ACTIVE_LOW = (1 << 0),
	
GPIO_OPEN_DRAIN = (1 << 1),
	
GPIO_OPEN_SOURCE = (1 << 2),
	
GPIO_PERSISTENT = (0 << 3),
	
GPIO_TRANSITORY = (1 << 3),
};

/**
 * struct gpiod_lookup - lookup table
 * @chip_label: name of the chip the GPIO belongs to
 * @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO
 * @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: mask of GPIO_* values
 *
 * gpiod_lookup is a lookup table for associating GPIOs to specific devices and
 * functions using platform data.
 */

struct gpiod_lookup {
	
const char *chip_label;
	
u16 chip_hwnum;
	
const char *con_id;
	
unsigned int idx;
	
enum gpio_lookup_flags flags;
};


struct gpiod_lookup_table {
	
struct list_head list;
	
const char *dev_id;
	
struct gpiod_lookup table[];
};

/*
 * Simple definition of a single GPIO under a con_id
 */

#define GPIO_LOOKUP(_chip_label, _chip_hwnum, _con_id, _flags) \
	GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, 0, _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(_chip_label, _chip_hwnum, _con_id, _idx, _flags)  \
{                                                                         \
        .chip_label = _chip_label,                                        \
        .chip_hwnum = _chip_hwnum,                                        \
        .con_id = _con_id,                                                \
        .idx = _idx,                                                      \
        .flags = _flags,                                                  \
}

#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);
#else

static inline

void gpiod_add_lookup_table(struct gpiod_lookup_table *table) {}
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static inline

void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) {}
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static inline

void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) {}
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#endif

#endif /* __LINUX_GPIO_MACHINE_H */
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Directory: include/linux/gpio

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