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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495/* 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[];};
/* * 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, \}
#ifdef CONFIG_GPIOLIBvoid 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 /* ! CONFIG_GPIOLIB */static inlinevoid gpiod_add_lookup_table(struct gpiod_lookup_table *table) {}static inlinevoid gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) {}static inlinevoid gpiod_remove_lookup_table(struct gpiod_lookup_table *table) {}#endif /* CONFIG_GPIOLIB */
#endif /* __LINUX_GPIO_MACHINE_H */