LXR linux/include/linux/gpio/machine.h

   1#ifndef __LINUX_GPIO_MACHINE_H
   2#define __LINUX_GPIO_MACHINE_H
   3
   4#include <linux/types.h>
   5#include <linux/list.h>
   6
   7enum gpio_lookup_flags {
   8        GPIO_ACTIVE_HIGH = (0 << 0),
   9        GPIO_ACTIVE_LOW = (1 << 0),
  10        GPIO_OPEN_DRAIN = (1 << 1),
  11        GPIO_OPEN_SOURCE = (1 << 2),
  12};
  13
  14/**
  15 * struct gpiod_lookup - lookup table
  16 * @chip_label: name of the chip the GPIO belongs to
  17 * @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO
  18 * @con_id: name of the GPIO from the device's point of view
  19 * @idx: index of the GPIO in case several GPIOs share the same name
  20 * @flags: mask of GPIO_* values
  21 *
  22 * gpiod_lookup is a lookup table for associating GPIOs to specific devices and
  23 * functions using platform data.
  24 */
  25struct gpiod_lookup {
  26        const char *chip_label;
  27        u16 chip_hwnum;
  28        const char *con_id;
  29        unsigned int idx;
  30        enum gpio_lookup_flags flags;
  31};
  32
  33struct gpiod_lookup_table {
  34        struct list_head list;
  35        const char *dev_id;
  36        struct gpiod_lookup table[];
  37};
  38
  39/*
  40 * Simple definition of a single GPIO under a con_id
  41 */
  42#define GPIO_LOOKUP(_chip_label, _chip_hwnum, _con_id, _flags) \
  43        GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, 0, _flags)
  44
  45/*
  46 * Use this macro if you need to have several GPIOs under the same con_id.
  47 * Each GPIO needs to use a different index and can be accessed using
  48 * gpiod_get_index()
  49 */
  50#define GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, _idx, _flags)  \
  51{                                                                         \
  52        .chip_label = _chip_label,                                        \
  53        .chip_hwnum = _chip_hwnum,                                        \
  54        .con_id = _con_id,                                                \
  55        .idx = _idx,                                                      \
  56        .flags = _flags,                                                  \
  57}
  58
  59#ifdef CONFIG_GPIOLIB
  60void gpiod_add_lookup_table(struct gpiod_lookup_table *table);
  61void gpiod_remove_lookup_table(struct gpiod_lookup_table *table);
  62#else
  63static inline
  64void gpiod_add_lookup_table(struct gpiod_lookup_table *table) {}
  65static inline
  66void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) {}
  67#endif
  68
  69#endif /* __LINUX_GPIO_MACHINE_H */
  70