include/linux/pinctrl/pinctrl.h

   1 /*
   2  * Interface the pinctrl subsystem
   3  *
   4  * Copyright (C) 2011 ST-Ericsson SA
   5  * Written on behalf of Linaro for ST-Ericsson
   6  * This interface is used in the core to keep track of pins.
   7  *
   8  * Author: Linus Walleij <linus.walleij@linaro.org>
   9  *
  10  * License terms: GNU General Public License (GPL) version 2
  11  */
  12 #ifndef __LINUX_PINCTRL_PINCTRL_H
  13 #define __LINUX_PINCTRL_PINCTRL_H
  14
  15 #ifdef CONFIG_PINCTRL
  16
  17 #include <linux/radix-tree.h>
  18 #include <linux/list.h>
  19 #include <linux/seq_file.h>
  20 #include "pinctrl-state.h"
  21
  22 struct device;
  23 struct pinctrl_dev;
  24 struct pinctrl_map;
  25 struct pinmux_ops;
  26 struct pinconf_ops;
  27 struct gpio_chip;
  28 struct device_node;
  29
  30 /**
  31  * struct pinctrl_pin_desc - boards/machines provide information on their
  32  * pins, pads or other muxable units in this struct
  33  * @number: unique pin number from the global pin number space
  34  * @name: a name for this pin
  35  */
  36 struct pinctrl_pin_desc {
  37         unsigned number;
  38         const char *name;
  39 };
  40
  41 /* Convenience macro to define a single named or anonymous pin descriptor */
  42 #define PINCTRL_PIN(a, b) { .number = a, .name = b }
  43 #define PINCTRL_PIN_ANON(a) { .number = a }
  44
  45 /**
  46  * struct pinctrl_gpio_range - each pin controller can provide subranges of
  47  * the GPIO number space to be handled by the controller
  48  * @node: list node for internal use
  49  * @name: a name for the chip in this range
  50  * @id: an ID number for the chip in this range
  51  * @base: base offset of the GPIO range
  52  * @pin_base: base pin number of the GPIO range
  53  * @npins: number of pins in the GPIO range, including the base number
  54  * @gc: an optional pointer to a gpio_chip
  55  */
  56 struct pinctrl_gpio_range {
  57         struct list_head node;
  58         const char *name;
  59         unsigned int id;
  60         unsigned int base;
  61         unsigned int pin_base;
  62         unsigned int npins;
  63         struct gpio_chip *gc;
  64 };
  65
  66 /**
  67  * struct pinctrl_ops - global pin control operations, to be implemented by
  68  * pin controller drivers.
  69  * @get_groups_count: Returns the count of total number of groups registered.
  70  * @get_group_name: return the group name of the pin group
  71  * @get_group_pins: return an array of pins corresponding to a certain
  72  *      group selector @pins, and the size of the array in @num_pins
  73  * @pin_dbg_show: optional debugfs display hook that will provide per-device
  74  *      info for a certain pin in debugfs
  75  * @dt_node_to_map: parse a device tree "pin configuration node", and create
  76  *      mapping table entries for it. These are returned through the @map and
  77  *      @num_maps output parameters. This function is optional, and may be
  78  *      omitted for pinctrl drivers that do not support device tree.
  79  * @dt_free_map: free mapping table entries created via @dt_node_to_map. The
  80  *      top-level @map pointer must be freed, along with any dynamically
  81  *      allocated members of the mapping table entries themselves. This
  82  *      function is optional, and may be omitted for pinctrl drivers that do
  83  *      not support device tree.
  84  */
  85 struct pinctrl_ops {
  86         int (*get_groups_count) (struct pinctrl_dev *pctldev);
  87         const char *(*get_group_name) (struct pinctrl_dev *pctldev,
  88                                        unsigned selector);
  89         int (*get_group_pins) (struct pinctrl_dev *pctldev,
  90                                unsigned selector,
  91                                const unsigned **pins,
  92                                unsigned *num_pins);
  93         void (*pin_dbg_show) (struct pinctrl_dev *pctldev, struct seq_file *s,
  94                           unsigned offset);
  95         int (*dt_node_to_map) (struct pinctrl_dev *pctldev,
  96                                struct device_node *np_config,
  97                                struct pinctrl_map **map, unsigned *num_maps);
  98         void (*dt_free_map) (struct pinctrl_dev *pctldev,
  99                              struct pinctrl_map *map, unsigned num_maps);
 100 };
 101
 102 /**
 103  * struct pinctrl_desc - pin controller descriptor, register this to pin
 104  * control subsystem
 105  * @name: name for the pin controller
 106  * @pins: an array of pin descriptors describing all the pins handled by
 107  *      this pin controller
 108  * @npins: number of descriptors in the array, usually just ARRAY_SIZE()
 109  *      of the pins field above
 110  * @pctlops: pin control operation vtable, to support global concepts like
 111  *      grouping of pins, this is optional.
 112  * @pmxops: pinmux operations vtable, if you support pinmuxing in your driver
 113  * @confops: pin config operations vtable, if you support pin configuration in
 114  *      your driver
 115  * @owner: module providing the pin controller, used for refcounting
 116  */
 117 struct pinctrl_desc {
 118         const char *name;
 119         struct pinctrl_pin_desc const *pins;
 120         unsigned int npins;
 121         struct pinctrl_ops *pctlops;
 122         struct pinmux_ops *pmxops;
 123         struct pinconf_ops *confops;
 124         struct module *owner;
 125 };
 126
 127 /* External interface to pin controller */
 128 extern struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
 129                                 struct device *dev, void *driver_data);
 130 extern void pinctrl_unregister(struct pinctrl_dev *pctldev);
 131 extern bool pin_is_valid(struct pinctrl_dev *pctldev, int pin);
 132 extern void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
 133                                 struct pinctrl_gpio_range *range);
 134 extern void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
 135                                 struct pinctrl_gpio_range *ranges,
 136                                 unsigned nranges);
 137 extern const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev);
 138 extern void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev);
 139 #else
 140
 141 struct pinctrl_dev;
 142
 143 /* Sufficiently stupid default functions when pinctrl is not in use */
 144 static inline bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
 145 {
 146         return pin >= 0;
 147 }
 148
 149 #endif /* !CONFIG_PINCTRL */
 150
 151 #endif /* __LINUX_PINCTRL_PINCTRL_H */