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 <linux/pinctrl/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 if pins == NULL
  53  * @pins: enumeration of pins in GPIO range or NULL
  54  * @npins: number of pins in the GPIO range, including the base number
  55  * @gc: an optional pointer to a gpio_chip
  56  */
  57 struct pinctrl_gpio_range {
  58         struct list_head node;
  59         const char *name;
  60         unsigned int id;
  61         unsigned int base;
  62         unsigned int pin_base;
  63         unsigned const *pins;
  64         unsigned int npins;
  65         struct gpio_chip *gc;
  66 };
  67
  68 /**
  69  * struct pinctrl_ops - global pin control operations, to be implemented by
  70  * pin controller drivers.
  71  * @get_groups_count: Returns the count of total number of groups registered.
  72  * @get_group_name: return the group name of the pin group
  73  * @get_group_pins: return an array of pins corresponding to a certain
  74  *      group selector @pins, and the size of the array in @num_pins
  75  * @pin_dbg_show: optional debugfs display hook that will provide per-device
  76  *      info for a certain pin in debugfs
  77  * @dt_node_to_map: parse a device tree "pin configuration node", and create
  78  *      mapping table entries for it. These are returned through the @map and
  79  *      @num_maps output parameters. This function is optional, and may be
  80  *      omitted for pinctrl drivers that do not support device tree.
  81  * @dt_free_map: free mapping table entries created via @dt_node_to_map. The
  82  *      top-level @map pointer must be freed, along with any dynamically
  83  *      allocated members of the mapping table entries themselves. This
  84  *      function is optional, and may be omitted for pinctrl drivers that do
  85  *      not support device tree.
  86  */
  87 struct pinctrl_ops {
  88         int (*get_groups_count) (struct pinctrl_dev *pctldev);
  89         const char *(*get_group_name) (struct pinctrl_dev *pctldev,
  90                                        unsigned selector);
  91         int (*get_group_pins) (struct pinctrl_dev *pctldev,
  92                                unsigned selector,
  93                                const unsigned **pins,
  94                                unsigned *num_pins);
  95         void (*pin_dbg_show) (struct pinctrl_dev *pctldev, struct seq_file *s,
  96                           unsigned offset);
  97         int (*dt_node_to_map) (struct pinctrl_dev *pctldev,
  98                                struct device_node *np_config,
  99                                struct pinctrl_map **map, unsigned *num_maps);
 100         void (*dt_free_map) (struct pinctrl_dev *pctldev,
 101                              struct pinctrl_map *map, unsigned num_maps);
 102 };
 103
 104 /**
 105  * struct pinctrl_desc - pin controller descriptor, register this to pin
 106  * control subsystem
 107  * @name: name for the pin controller
 108  * @pins: an array of pin descriptors describing all the pins handled by
 109  *      this pin controller
 110  * @npins: number of descriptors in the array, usually just ARRAY_SIZE()
 111  *      of the pins field above
 112  * @pctlops: pin control operation vtable, to support global concepts like
 113  *      grouping of pins, this is optional.
 114  * @pmxops: pinmux operations vtable, if you support pinmuxing in your driver
 115  * @confops: pin config operations vtable, if you support pin configuration in
 116  *      your driver
 117  * @owner: module providing the pin controller, used for refcounting
 118  */
 119 struct pinctrl_desc {
 120         const char *name;
 121         struct pinctrl_pin_desc const *pins;
 122         unsigned int npins;
 123         const struct pinctrl_ops *pctlops;
 124         const struct pinmux_ops *pmxops;
 125         const struct pinconf_ops *confops;
 126         struct module *owner;
 127 };
 128
 129 /* External interface to pin controller */
 130 extern struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
 131                                 struct device *dev, void *driver_data);
 132 extern void pinctrl_unregister(struct pinctrl_dev *pctldev);
 133 extern bool pin_is_valid(struct pinctrl_dev *pctldev, int pin);
 134 extern void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
 135                                 struct pinctrl_gpio_range *range);
 136 extern void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
 137                                 struct pinctrl_gpio_range *ranges,
 138                                 unsigned nranges);
 139 extern void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
 140                                 struct pinctrl_gpio_range *range);
 141
 142 extern struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
 143                 struct pinctrl_gpio_range *range);
 144 extern struct pinctrl_gpio_range *
 145 pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
 146                                  unsigned int pin);
 147
 148 #ifdef CONFIG_OF
 149 extern struct pinctrl_dev *of_pinctrl_get(struct device_node *np);
 150 #else
 151 static inline
 152 struct pinctrl_dev *of_pinctrl_get(struct device_node *np)
 153 {
 154         return NULL;
 155 }
 156 #endif /* CONFIG_OF */
 157
 158 extern const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev);
 159 extern const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev);
 160 extern void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev);
 161 #else
 162
 163 struct pinctrl_dev;
 164
 165 /* Sufficiently stupid default functions when pinctrl is not in use */
 166 static inline bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
 167 {
 168         return pin >= 0;
 169 }
 170
 171 #endif /* !CONFIG_PINCTRL */
 172
 173 #endif /* __LINUX_PINCTRL_PINCTRL_H */