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 GPIO_SLEEP_MAINTAIN_VALUE = (0 << 3), 13 GPIO_SLEEP_MAY_LOOSE_VALUE = (1 << 3), 14 }; 15 16 /** 17 * struct gpiod_lookup - lookup table 18 * @chip_label: name of the chip the GPIO belongs to 19 * @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO 20 * @con_id: name of the GPIO from the device's point of view 21 * @idx: index of the GPIO in case several GPIOs share the same name 22 * @flags: mask of GPIO_* values 23 * 24 * gpiod_lookup is a lookup table for associating GPIOs to specific devices and 25 * functions using platform data. 26 */ 27 struct gpiod_lookup { 28 const char *chip_label; 29 u16 chip_hwnum; 30 const char *con_id; 31 unsigned int idx; 32 enum gpio_lookup_flags flags; 33 }; 34 35 struct gpiod_lookup_table { 36 struct list_head list; 37 const char *dev_id; 38 struct gpiod_lookup table[]; 39 }; 40 41 /* 42 * Simple definition of a single GPIO under a con_id 43 */ 44 #define GPIO_LOOKUP(_chip_label, _chip_hwnum, _con_id, _flags) \ 45 GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, 0, _flags) 46 47 /* 48 * Use this macro if you need to have several GPIOs under the same con_id. 49 * Each GPIO needs to use a different index and can be accessed using 50 * gpiod_get_index() 51 */ 52 #define GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, _idx, _flags) \ 53 { \ 54 .chip_label = _chip_label, \ 55 .chip_hwnum = _chip_hwnum, \ 56 .con_id = _con_id, \ 57 .idx = _idx, \ 58 .flags = _flags, \ 59 } 60 61 #ifdef CONFIG_GPIOLIB 62 void gpiod_add_lookup_table(struct gpiod_lookup_table *table); 63 void gpiod_remove_lookup_table(struct gpiod_lookup_table *table); 64 #else 65 static inline 66 void gpiod_add_lookup_table(struct gpiod_lookup_table *table) {} 67 static inline 68 void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) {} 69 #endif 70 71 #endif /* __LINUX_GPIO_MACHINE_H */ 72