1 #ifndef __LINUX_GPIO_MACHINE_H 2 #define __LINUX_GPIO_MACHINE_H 3 4 #include <linux/types.h> 5 #include <linux/list.h> 6 7 enum 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 */ 25 struct 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 33 struct 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 void gpiod_add_lookup_table(struct gpiod_lookup_table *table); 60 61 #endif /* __LINUX_GPIO_MACHINE_H */ 62