blob: c0d712d22b079ebc16129ef2618f41762276cf5e [file] [log] [blame]
Linus Walleij0a6d3152014-07-24 20:08:55 +02001#ifndef __LINUX_GPIO_MACHINE_H
2#define __LINUX_GPIO_MACHINE_H
3
Alexandre Courbotb3ea0742014-08-04 13:05:56 +09004#include <linux/types.h>
5#include <linux/list.h>
6
Linus Walleij0a6d3152014-07-24 20:08:55 +02007enum 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
59void gpiod_add_lookup_table(struct gpiod_lookup_table *table);
Shobhit Kumarbe9015a2015-06-26 14:32:04 +053060void gpiod_remove_lookup_table(struct gpiod_lookup_table *table);
Linus Walleij0a6d3152014-07-24 20:08:55 +020061
62#endif /* __LINUX_GPIO_MACHINE_H */