1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LINUX_GPIO_MACHINE_H 3 #define __LINUX_GPIO_MACHINE_H 4 5 #include <linux/types.h> 6 #include <linux/list.h> 7 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), 13 GPIO_SLEEP_MAINTAIN_VALUE = (0 << 3), 14 GPIO_SLEEP_MAY_LOOSE_VALUE = (1 << 3), 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 62 #ifdef CONFIG_GPIOLIB 63 void gpiod_add_lookup_table(struct gpiod_lookup_table *table); 64 void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n); 65 void gpiod_remove_lookup_table(struct gpiod_lookup_table *table); 66 #else 67 static inline 68 void gpiod_add_lookup_table(struct gpiod_lookup_table *table) {} 69 static inline 70 void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) {} 71 static inline 72 void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) {} 73 #endif 74 75 #endif /* __LINUX_GPIO_MACHINE_H */ 76