root/include/linux/gpio/machine.h

INCLUDED FROM

DEFINITIONS

1. gpiod_add_lookup_table
2. gpiod_add_lookup_tables
3. gpiod_remove_lookup_table
4. gpiod_add_hogs

   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_PERSISTENT                 = (0 << 3),
  14         GPIO_TRANSITORY                 = (1 << 3),
  15         GPIO_PULL_UP                    = (1 << 4),
  16         GPIO_PULL_DOWN                  = (1 << 5),
  17 
  18         GPIO_LOOKUP_FLAGS_DEFAULT       = GPIO_ACTIVE_HIGH | GPIO_PERSISTENT,
  19 };
  20 
  21 /**
  22  * struct gpiod_lookup - lookup table
  23  * @chip_label: name of the chip the GPIO belongs to
  24  * @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO
  25  * @con_id: name of the GPIO from the device's point of view
  26  * @idx: index of the GPIO in case several GPIOs share the same name
  27  * @flags: bitmask of gpio_lookup_flags GPIO_* values
  28  *
  29  * gpiod_lookup is a lookup table for associating GPIOs to specific devices and
  30  * functions using platform data.
  31  */
  32 struct gpiod_lookup {
  33         const char *chip_label;
  34         u16 chip_hwnum;
  35         const char *con_id;
  36         unsigned int idx;
  37         unsigned long flags;
  38 };
  39 
  40 struct gpiod_lookup_table {
  41         struct list_head list;
  42         const char *dev_id;
  43         struct gpiod_lookup table[];
  44 };
  45 
  46 /**
  47  * struct gpiod_hog - GPIO line hog table
  48  * @chip_label: name of the chip the GPIO belongs to
  49  * @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO
  50  * @line_name: consumer name for the hogged line
  51  * @lflags: bitmask of gpio_lookup_flags GPIO_* values
  52  * @dflags: GPIO flags used to specify the direction and value
  53  */
  54 struct gpiod_hog {
  55         struct list_head list;
  56         const char *chip_label;
  57         u16 chip_hwnum;
  58         const char *line_name;
  59         unsigned long lflags;
  60         int dflags;
  61 };
  62 
  63 /*
  64  * Simple definition of a single GPIO under a con_id
  65  */
  66 #define GPIO_LOOKUP(_chip_label, _chip_hwnum, _con_id, _flags) \
  67         GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, 0, _flags)
  68 
  69 /*
  70  * Use this macro if you need to have several GPIOs under the same con_id.
  71  * Each GPIO needs to use a different index and can be accessed using
  72  * gpiod_get_index()
  73  */
  74 #define GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, _idx, _flags)  \
  75 {                                                                         \
  76         .chip_label = _chip_label,                                        \
  77         .chip_hwnum = _chip_hwnum,                                        \
  78         .con_id = _con_id,                                                \
  79         .idx = _idx,                                                      \
  80         .flags = _flags,                                                  \
  81 }
  82 
  83 /*
  84  * Simple definition of a single GPIO hog in an array.
  85  */
  86 #define GPIO_HOG(_chip_label, _chip_hwnum, _line_name, _lflags, _dflags)  \
  87 {                                                                         \
  88         .chip_label = _chip_label,                                        \
  89         .chip_hwnum = _chip_hwnum,                                        \
  90         .line_name = _line_name,                                          \
  91         .lflags = _lflags,                                                \
  92         .dflags = _dflags,                                                \
  93 }
  94 
  95 #ifdef CONFIG_GPIOLIB
  96 void gpiod_add_lookup_table(struct gpiod_lookup_table *table);
  97 void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n);
  98 void gpiod_remove_lookup_table(struct gpiod_lookup_table *table);
  99 void gpiod_add_hogs(struct gpiod_hog *hogs);
 100 #else /* ! CONFIG_GPIOLIB */
 101 static inline
 102 void gpiod_add_lookup_table(struct gpiod_lookup_table *table) {}
 103 static inline
 104 void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) {}
 105 static inline
 106 void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) {}
 107 static inline void gpiod_add_hogs(struct gpiod_hog *hogs) {}
 108 #endif /* CONFIG_GPIOLIB */
 109 
 110 #endif /* __LINUX_GPIO_MACHINE_H */