include/linux/gpio/machine.h

   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 #ifdef CONFIG_GPIOLIB
  60 void gpiod_add_lookup_table(struct gpiod_lookup_table *table);
  61 void gpiod_remove_lookup_table(struct gpiod_lookup_table *table);
  62 #else
  63 static inline
  64 void gpiod_add_lookup_table(struct gpiod_lookup_table *table) {}
  65 static inline
  66 void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) {}
  67 #endif
  68
  69 #endif /* __LINUX_GPIO_MACHINE_H */