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 pin_config_item;
  28 struct gpio_chip;
  29 struct device_node;
  30
  31 /**
  32  * struct pinctrl_pin_desc - boards/machines provide information on their
  33  * pins, pads or other muxable units in this struct
  34  * @number: unique pin number from the global pin number space
  35  * @name: a name for this pin
  36  * @drv_data: driver-defined per-pin data. pinctrl core does not touch this
  37  */
  38 struct pinctrl_pin_desc {
  39         unsigned number;
  40         const char *name;
  41         void *drv_data;
  42 };
  43
  44 /* Convenience macro to define a single named or anonymous pin descriptor */
  45 #define PINCTRL_PIN(a, b) { .number = a, .name = b }
  46 #define PINCTRL_PIN_ANON(a) { .number = a }
  47
  48 /**
  49  * struct pinctrl_gpio_range - each pin controller can provide subranges of
  50  * the GPIO number space to be handled by the controller
  51  * @node: list node for internal use
  52  * @name: a name for the chip in this range
  53  * @id: an ID number for the chip in this range
  54  * @base: base offset of the GPIO range
  55  * @pin_base: base pin number of the GPIO range if pins == NULL
  56  * @pins: enumeration of pins in GPIO range or NULL
  57  * @npins: number of pins in the GPIO range, including the base number
  58  * @gc: an optional pointer to a gpio_chip
  59  */
  60 struct pinctrl_gpio_range {
  61         struct list_head node;
  62         const char *name;
  63         unsigned int id;
  64         unsigned int base;
  65         unsigned int pin_base;
  66         unsigned const *pins;
  67         unsigned int npins;
  68         struct gpio_chip *gc;
  69 };
  70
  71 /**
  72  * struct pinctrl_ops - global pin control operations, to be implemented by
  73  * pin controller drivers.
  74  * @get_groups_count: Returns the count of total number of groups registered.
  75  * @get_group_name: return the group name of the pin group
  76  * @get_group_pins: return an array of pins corresponding to a certain
  77  *      group selector @pins, and the size of the array in @num_pins
  78  * @pin_dbg_show: optional debugfs display hook that will provide per-device
  79  *      info for a certain pin in debugfs
  80  * @dt_node_to_map: parse a device tree "pin configuration node", and create
  81  *      mapping table entries for it. These are returned through the @map and
  82  *      @num_maps output parameters. This function is optional, and may be
  83  *      omitted for pinctrl drivers that do not support device tree.
  84  * @dt_free_map: free mapping table entries created via @dt_node_to_map. The
  85  *      top-level @map pointer must be freed, along with any dynamically
  86  *      allocated members of the mapping table entries themselves. This
  87  *      function is optional, and may be omitted for pinctrl drivers that do
  88  *      not support device tree.
  89  */
  90 struct pinctrl_ops {
  91         int (*get_groups_count) (struct pinctrl_dev *pctldev);
  92         const char *(*get_group_name) (struct pinctrl_dev *pctldev,
  93                                        unsigned selector);
  94         int (*get_group_pins) (struct pinctrl_dev *pctldev,
  95                                unsigned selector,
  96                                const unsigned **pins,
  97                                unsigned *num_pins);
  98         void (*pin_dbg_show) (struct pinctrl_dev *pctldev, struct seq_file *s,
  99                           unsigned offset);
 100         int (*dt_node_to_map) (struct pinctrl_dev *pctldev,
 101                                struct device_node *np_config,
 102                                struct pinctrl_map **map, unsigned *num_maps);
 103         void (*dt_free_map) (struct pinctrl_dev *pctldev,
 104                              struct pinctrl_map *map, unsigned num_maps);
 105 };
 106
 107 /**
 108  * struct pinctrl_desc - pin controller descriptor, register this to pin
 109  * control subsystem
 110  * @name: name for the pin controller
 111  * @pins: an array of pin descriptors describing all the pins handled by
 112  *      this pin controller
 113  * @npins: number of descriptors in the array, usually just ARRAY_SIZE()
 114  *      of the pins field above
 115  * @pctlops: pin control operation vtable, to support global concepts like
 116  *      grouping of pins, this is optional.
 117  * @pmxops: pinmux operations vtable, if you support pinmuxing in your driver
 118  * @confops: pin config operations vtable, if you support pin configuration in
 119  *      your driver
 120  * @owner: module providing the pin controller, used for refcounting
 121  * @num_custom_params: Number of driver-specific custom parameters to be parsed
 122  *      from the hardware description
 123  * @custom_params: List of driver_specific custom parameters to be parsed from
 124  *      the hardware description
 125  * @custom_conf_items: Information how to print @params in debugfs, must be
 126  *      the same size as the @custom_params, i.e. @num_custom_params
 127  */
 128 struct pinctrl_desc {
 129         const char *name;
 130         const struct pinctrl_pin_desc *pins;
 131         unsigned int npins;
 132         const struct pinctrl_ops *pctlops;
 133         const struct pinmux_ops *pmxops;
 134         const struct pinconf_ops *confops;
 135         struct module *owner;
 136 #ifdef CONFIG_GENERIC_PINCONF
 137         unsigned int num_custom_params;
 138         const struct pinconf_generic_params *custom_params;
 139         const struct pin_config_item *custom_conf_items;
 140 #endif
 141 };
 142
 143 /* External interface to pin controller */
 144 extern struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
 145                                 struct device *dev, void *driver_data);
 146 extern void pinctrl_unregister(struct pinctrl_dev *pctldev);
 147 extern bool pin_is_valid(struct pinctrl_dev *pctldev, int pin);
 148 extern void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
 149                                 struct pinctrl_gpio_range *range);
 150 extern void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
 151                                 struct pinctrl_gpio_range *ranges,
 152                                 unsigned nranges);
 153 extern void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
 154                                 struct pinctrl_gpio_range *range);
 155
 156 extern struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
 157                 struct pinctrl_gpio_range *range);
 158 extern struct pinctrl_gpio_range *
 159 pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
 160                                  unsigned int pin);
 161 extern int pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
 162                                 const char *pin_group, const unsigned **pins,
 163                                 unsigned *num_pins);
 164
 165 #ifdef CONFIG_OF
 166 extern struct pinctrl_dev *of_pinctrl_get(struct device_node *np);
 167 #else
 168 static inline
 169 struct pinctrl_dev *of_pinctrl_get(struct device_node *np)
 170 {
 171         return NULL;
 172 }
 173 #endif /* CONFIG_OF */
 174
 175 extern const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev);
 176 extern const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev);
 177 extern void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev);
 178 #else
 179
 180 struct pinctrl_dev;
 181
 182 /* Sufficiently stupid default functions when pinctrl is not in use */
 183 static inline bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
 184 {
 185         return pin >= 0;
 186 }
 187
 188 #endif /* !CONFIG_PINCTRL */
 189
 190 #endif /* __LINUX_PINCTRL_PINCTRL_H */