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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
0a6d3158 LW |
2 | #ifndef __LINUX_GPIO_MACHINE_H |
3 | #define __LINUX_GPIO_MACHINE_H | |
4 | ||
b3ea074f AC |
5 | #include <linux/types.h> |
6 | #include <linux/list.h> | |
7 | ||
0a6d3158 LW |
8 | enum gpio_lookup_flags { |
9 | GPIO_ACTIVE_HIGH = (0 << 0), | |
10 | GPIO_ACTIVE_LOW = (1 << 0), | |
11 | GPIO_OPEN_DRAIN = (1 << 1), | |
12 | GPIO_OPEN_SOURCE = (1 << 2), | |
05f479bf | 13 | GPIO_SLEEP_MAINTAIN_VALUE = (0 << 3), |
2cbfca66 | 14 | GPIO_SLEEP_MAY_LOSE_VALUE = (1 << 3), |
0a6d3158 LW |
15 | }; |
16 | ||
17 | /** | |
18 | * struct gpiod_lookup - lookup table | |
19 | * @chip_label: name of the chip the GPIO belongs to | |
20 | * @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO | |
21 | * @con_id: name of the GPIO from the device's point of view | |
22 | * @idx: index of the GPIO in case several GPIOs share the same name | |
23 | * @flags: mask of GPIO_* values | |
24 | * | |
25 | * gpiod_lookup is a lookup table for associating GPIOs to specific devices and | |
26 | * functions using platform data. | |
27 | */ | |
28 | struct gpiod_lookup { | |
29 | const char *chip_label; | |
30 | u16 chip_hwnum; | |
31 | const char *con_id; | |
32 | unsigned int idx; | |
33 | enum gpio_lookup_flags flags; | |
34 | }; | |
35 | ||
36 | struct gpiod_lookup_table { | |
37 | struct list_head list; | |
38 | const char *dev_id; | |
39 | struct gpiod_lookup table[]; | |
40 | }; | |
41 | ||
42 | /* | |
43 | * Simple definition of a single GPIO under a con_id | |
44 | */ | |
45 | #define GPIO_LOOKUP(_chip_label, _chip_hwnum, _con_id, _flags) \ | |
46 | GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, 0, _flags) | |
47 | ||
48 | /* | |
49 | * Use this macro if you need to have several GPIOs under the same con_id. | |
50 | * Each GPIO needs to use a different index and can be accessed using | |
51 | * gpiod_get_index() | |
52 | */ | |
53 | #define GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, _idx, _flags) \ | |
54 | { \ | |
55 | .chip_label = _chip_label, \ | |
56 | .chip_hwnum = _chip_hwnum, \ | |
57 | .con_id = _con_id, \ | |
58 | .idx = _idx, \ | |
59 | .flags = _flags, \ | |
60 | } | |
61 | ||
020e0b1c | 62 | #ifdef CONFIG_GPIOLIB |
0a6d3158 | 63 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table); |
3946d187 | 64 | void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n); |
be9015ab | 65 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table); |
020e0b1c AG |
66 | #else |
67 | static inline | |
68 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) {} | |
69 | static inline | |
3946d187 DT |
70 | void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) {} |
71 | static inline | |
020e0b1c AG |
72 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) {} |
73 | #endif | |
0a6d3158 LW |
74 | |
75 | #endif /* __LINUX_GPIO_MACHINE_H */ |