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         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 */