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 #include <linux/pinctrl/devinfo.h>
  22
  23 struct device;
  24 struct pinctrl_dev;
  25 struct pinctrl_map;
  26 struct pinmux_ops;
  27 struct pinconf_ops;
  28 struct pin_config_item;
  29 struct gpio_chip;
  30 struct device_node;
  31
  32 /**
  33  * struct pinctrl_pin_desc - boards/machines provide information on their
  34  * pins, pads or other muxable units in this struct
  35  * @number: unique pin number from the global pin number space
  36  * @name: a name for this pin
  37  * @drv_data: driver-defined per-pin data. pinctrl core does not touch this
  38  */
  39 struct pinctrl_pin_desc {
  40         unsigned number;
  41         const char *name;
  42         void *drv_data;
  43 };
  44
  45 /* Convenience macro to define a single named or anonymous pin descriptor */
  46 #define PINCTRL_PIN(a, b) { .number = a, .name = b }
  47 #define PINCTRL_PIN_ANON(a) { .number = a }
  48
  49 /**
  50  * struct pinctrl_gpio_range - each pin controller can provide subranges of
  51  * the GPIO number space to be handled by the controller
  52  * @node: list node for internal use
  53  * @name: a name for the chip in this range
  54  * @id: an ID number for the chip in this range
  55  * @base: base offset of the GPIO range
  56  * @pin_base: base pin number of the GPIO range if pins == NULL
  57  * @pins: enumeration of pins in GPIO range or NULL
  58  * @npins: number of pins in the GPIO range, including the base number
  59  * @gc: an optional pointer to a gpio_chip
  60  */
  61 struct pinctrl_gpio_range {
  62         struct list_head node;
  63         const char *name;
  64         unsigned int id;
  65         unsigned int base;
  66         unsigned int pin_base;
  67         unsigned const *pins;
  68         unsigned int npins;
  69         struct gpio_chip *gc;
  70 };
  71
  72 /**
  73  * struct pinctrl_ops - global pin control operations, to be implemented by
  74  * pin controller drivers.
  75  * @get_groups_count: Returns the count of total number of groups registered.
  76  * @get_group_name: return the group name of the pin group
  77  * @get_group_pins: return an array of pins corresponding to a certain
  78  *      group selector @pins, and the size of the array in @num_pins
  79  * @pin_dbg_show: optional debugfs display hook that will provide per-device
  80  *      info for a certain pin in debugfs
  81  * @dt_node_to_map: parse a device tree "pin configuration node", and create
  82  *      mapping table entries for it. These are returned through the @map and
  83  *      @num_maps output parameters. This function is optional, and may be
  84  *      omitted for pinctrl drivers that do not support device tree.
  85  * @dt_free_map: free mapping table entries created via @dt_node_to_map. The
  86  *      top-level @map pointer must be freed, along with any dynamically
  87  *      allocated members of the mapping table entries themselves. This
  88  *      function is optional, and may be omitted for pinctrl drivers that do
  89  *      not support device tree.
  90  */
  91 struct pinctrl_ops {
  92         int (*get_groups_count) (struct pinctrl_dev *pctldev);
  93         const char *(*get_group_name) (struct pinctrl_dev *pctldev,
  94                                        unsigned selector);
  95         int (*get_group_pins) (struct pinctrl_dev *pctldev,
  96                                unsigned selector,
  97                                const unsigned **pins,
  98                                unsigned *num_pins);
  99         void (*pin_dbg_show) (struct pinctrl_dev *pctldev, struct seq_file *s,
 100                           unsigned offset);
 101         int (*dt_node_to_map) (struct pinctrl_dev *pctldev,
 102                                struct device_node *np_config,
 103                                struct pinctrl_map **map, unsigned *num_maps);
 104         void (*dt_free_map) (struct pinctrl_dev *pctldev,
 105                              struct pinctrl_map *map, unsigned num_maps);
 106 };
 107
 108 /**
 109  * struct pinctrl_desc - pin controller descriptor, register this to pin
 110  * control subsystem
 111  * @name: name for the pin controller
 112  * @pins: an array of pin descriptors describing all the pins handled by
 113  *      this pin controller
 114  * @npins: number of descriptors in the array, usually just ARRAY_SIZE()
 115  *      of the pins field above
 116  * @pctlops: pin control operation vtable, to support global concepts like
 117  *      grouping of pins, this is optional.
 118  * @pmxops: pinmux operations vtable, if you support pinmuxing in your driver
 119  * @confops: pin config operations vtable, if you support pin configuration in
 120  *      your driver
 121  * @owner: module providing the pin controller, used for refcounting
 122  * @num_custom_params: Number of driver-specific custom parameters to be parsed
 123  *      from the hardware description
 124  * @custom_params: List of driver_specific custom parameters to be parsed from
 125  *      the hardware description
 126  * @custom_conf_items: Information how to print @params in debugfs, must be
 127  *      the same size as the @custom_params, i.e. @num_custom_params
 128  */
 129 struct pinctrl_desc {
 130         const char *name;
 131         const struct pinctrl_pin_desc *pins;
 132         unsigned int npins;
 133         const struct pinctrl_ops *pctlops;
 134         const struct pinmux_ops *pmxops;
 135         const struct pinconf_ops *confops;
 136         struct module *owner;
 137 #ifdef CONFIG_GENERIC_PINCONF
 138         unsigned int num_custom_params;
 139         const struct pinconf_generic_params *custom_params;
 140         const struct pin_config_item *custom_conf_items;
 141 #endif
 142 };
 143
 144 /* External interface to pin controller */
 145
 146 extern int pinctrl_register_and_init(struct pinctrl_desc *pctldesc,
 147                                      struct device *dev, void *driver_data,
 148                                      struct pinctrl_dev **pctldev);
 149 extern int pinctrl_enable(struct pinctrl_dev *pctldev);
 150
 151 /* Please use pinctrl_register_and_init() and pinctrl_enable() instead */
 152 extern struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
 153                                 struct device *dev, void *driver_data);
 154
 155 extern void pinctrl_unregister(struct pinctrl_dev *pctldev);
 156
 157 extern int devm_pinctrl_register_and_init(struct device *dev,
 158                                 struct pinctrl_desc *pctldesc,
 159                                 void *driver_data,
 160                                 struct pinctrl_dev **pctldev);
 161
 162 /* Please use devm_pinctrl_register_and_init() instead */
 163 extern struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
 164                                 struct pinctrl_desc *pctldesc,
 165                                 void *driver_data);
 166
 167 extern void devm_pinctrl_unregister(struct device *dev,
 168                                 struct pinctrl_dev *pctldev);
 169
 170 extern bool pin_is_valid(struct pinctrl_dev *pctldev, int pin);
 171 extern void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
 172                                 struct pinctrl_gpio_range *range);
 173 extern void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
 174                                 struct pinctrl_gpio_range *ranges,
 175                                 unsigned nranges);
 176 extern void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
 177                                 struct pinctrl_gpio_range *range);
 178
 179 extern struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
 180                 struct pinctrl_gpio_range *range);
 181 extern struct pinctrl_gpio_range *
 182 pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
 183                                  unsigned int pin);
 184 extern int pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
 185                                 const char *pin_group, const unsigned **pins,
 186                                 unsigned *num_pins);
 187
 188 #ifdef CONFIG_OF
 189 extern struct pinctrl_dev *of_pinctrl_get(struct device_node *np);
 190 #else
 191 static inline
 192 struct pinctrl_dev *of_pinctrl_get(struct device_node *np)
 193 {
 194         return NULL;
 195 }
 196 #endif /* CONFIG_OF */
 197
 198 extern const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev);
 199 extern const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev);
 200 extern void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev);
 201 #else
 202
 203 struct pinctrl_dev;
 204
 205 /* Sufficiently stupid default functions when pinctrl is not in use */
 206 static inline bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
 207 {
 208         return pin >= 0;
 209 }
 210
 211 #endif /* !CONFIG_PINCTRL */
 212
 213 #endif /* __LINUX_PINCTRL_PINCTRL_H */