128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __LINUX_GPIO_MACHINE_H
|
|
#define __LINUX_GPIO_MACHINE_H
|
|
|
|
#include <linux/types.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),
|
|
GPIO_PULL_UP = (1 << 4),
|
|
GPIO_PULL_DOWN = (1 << 5),
|
|
GPIO_PULL_DISABLE = (1 << 6),
|
|
|
|
GPIO_LOOKUP_FLAGS_DEFAULT = GPIO_ACTIVE_HIGH | GPIO_PERSISTENT,
|
|
};
|
|
|
|
/**
|
|
* 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 {
|
|
const char *key;
|
|
u16 chip_hwnum;
|
|
const char *con_id;
|
|
unsigned int idx;
|
|
unsigned long flags;
|
|
};
|
|
|
|
struct gpiod_lookup_table {
|
|
struct list_head list;
|
|
const char *dev_id;
|
|
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 {
|
|
struct list_head list;
|
|
const char *chip_label;
|
|
u16 chip_hwnum;
|
|
const char *line_name;
|
|
unsigned long lflags;
|
|
int dflags;
|
|
};
|
|
|
|
/*
|
|
* 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) \
|
|
static struct gpiod_lookup_table _name = { \
|
|
.dev_id = _dev_id, \
|
|
.table = { \
|
|
GPIO_LOOKUP(_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) \
|
|
GPIO_LOOKUP_IDX(_key, _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(_key, _chip_hwnum, _con_id, _idx, _flags) \
|
|
(struct gpiod_lookup) { \
|
|
.key = _key, \
|
|
.chip_hwnum = _chip_hwnum, \
|
|
.con_id = _con_id, \
|
|
.idx = _idx, \
|
|
.flags = _flags, \
|
|
}
|
|
|
|
/*
|
|
* Simple definition of a single GPIO hog in an array.
|
|
*/
|
|
#define GPIO_HOG(_chip_label, _chip_hwnum, _line_name, _lflags, _dflags) \
|
|
(struct gpiod_hog) { \
|
|
.chip_label = _chip_label, \
|
|
.chip_hwnum = _chip_hwnum, \
|
|
.line_name = _line_name, \
|
|
.lflags = _lflags, \
|
|
.dflags = _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 */
|