drivers/pinctrl/core.h

   1 /*
   2  * Core private header for the pin control subsystem
   3  *
   4  * Copyright (C) 2011 ST-Ericsson SA
   5  * Written on behalf of Linaro for ST-Ericsson
   6  *
   7  * Author: Linus Walleij <linus.walleij@linaro.org>
   8  *
   9  * License terms: GNU General Public License (GPL) version 2
  10  */
  11
  12 #include <linux/kref.h>
  13 #include <linux/mutex.h>
  14 #include <linux/radix-tree.h>
  15 #include <linux/pinctrl/pinconf.h>
  16 #include <linux/pinctrl/machine.h>
  17
  18 struct pinctrl_gpio_range;
  19
  20 /**
  21  * struct pinctrl_dev - pin control class device
  22  * @node: node to include this pin controller in the global pin controller list
  23  * @desc: the pin controller descriptor supplied when initializing this pin
  24  *      controller
  25  * @pin_desc_tree: each pin descriptor for this pin controller is stored in
  26  *      this radix tree
  27  * @gpio_ranges: a list of GPIO ranges that is handled by this pin controller,
  28  *      ranges are added to this list at runtime
  29  * @dev: the device entry for this pin controller
  30  * @owner: module providing the pin controller, used for refcounting
  31  * @driver_data: driver data for drivers registering to the pin controller
  32  *      subsystem
  33  * @p: result of pinctrl_get() for this device
  34  * @hog_default: default state for pins hogged by this device
  35  * @hog_sleep: sleep state for pins hogged by this device
  36  * @mutex: mutex taken on each pin controller specific action
  37  * @device_root: debugfs root for this device
  38  */
  39 struct pinctrl_dev {
  40         struct list_head node;
  41         struct pinctrl_desc *desc;
  42         struct radix_tree_root pin_desc_tree;
  43         struct list_head gpio_ranges;
  44         struct device *dev;
  45         struct module *owner;
  46         void *driver_data;
  47         struct pinctrl *p;
  48         struct pinctrl_state *hog_default;
  49         struct pinctrl_state *hog_sleep;
  50         struct mutex mutex;
  51 #ifdef CONFIG_DEBUG_FS
  52         struct dentry *device_root;
  53 #endif
  54 };
  55
  56 /**
  57  * struct pinctrl - per-device pin control state holder
  58  * @node: global list node
  59  * @dev: the device using this pin control handle
  60  * @states: a list of states for this device
  61  * @state: the current state
  62  * @dt_maps: the mapping table chunks dynamically parsed from device tree for
  63  *      this device, if any
  64  * @users: reference count
  65  */
  66 struct pinctrl {
  67         struct list_head node;
  68         struct device *dev;
  69         struct list_head states;
  70         struct pinctrl_state *state;
  71         struct list_head dt_maps;
  72         struct kref users;
  73 };
  74
  75 /**
  76  * struct pinctrl_state - a pinctrl state for a device
  77  * @node: list node for struct pinctrl's @states field
  78  * @name: the name of this state
  79  * @settings: a list of settings for this state
  80  */
  81 struct pinctrl_state {
  82         struct list_head node;
  83         const char *name;
  84         struct list_head settings;
  85 };
  86
  87 /**
  88  * struct pinctrl_setting_mux - setting data for MAP_TYPE_MUX_GROUP
  89  * @group: the group selector to program
  90  * @func: the function selector to program
  91  */
  92 struct pinctrl_setting_mux {
  93         unsigned group;
  94         unsigned func;
  95 };
  96
  97 /**
  98  * struct pinctrl_setting_configs - setting data for MAP_TYPE_CONFIGS_*
  99  * @group_or_pin: the group selector or pin ID to program
 100  * @configs: a pointer to an array of config parameters/values to program into
 101  *      hardware. Each individual pin controller defines the format and meaning
 102  *      of config parameters.
 103  * @num_configs: the number of entries in array @configs
 104  */
 105 struct pinctrl_setting_configs {
 106         unsigned group_or_pin;
 107         unsigned long *configs;
 108         unsigned num_configs;
 109 };
 110
 111 /**
 112  * struct pinctrl_setting - an individual mux or config setting
 113  * @node: list node for struct pinctrl_settings's @settings field
 114  * @type: the type of setting
 115  * @pctldev: pin control device handling to be programmed. Not used for
 116  *   PIN_MAP_TYPE_DUMMY_STATE.
 117  * @dev_name: the name of the device using this state
 118  * @data: Data specific to the setting type
 119  */
 120 struct pinctrl_setting {
 121         struct list_head node;
 122         enum pinctrl_map_type type;
 123         struct pinctrl_dev *pctldev;
 124         const char *dev_name;
 125         union {
 126                 struct pinctrl_setting_mux mux;
 127                 struct pinctrl_setting_configs configs;
 128         } data;
 129 };
 130
 131 /**
 132  * struct pin_desc - pin descriptor for each physical pin in the arch
 133  * @pctldev: corresponding pin control device
 134  * @name: a name for the pin, e.g. the name of the pin/pad/finger on a
 135  *      datasheet or such
 136  * @dynamic_name: if the name of this pin was dynamically allocated
 137  * @drv_data: driver-defined per-pin data. pinctrl core does not touch this
 138  * @mux_usecount: If zero, the pin is not claimed, and @owner should be NULL.
 139  *      If non-zero, this pin is claimed by @owner. This field is an integer
 140  *      rather than a boolean, since pinctrl_get() might process multiple
 141  *      mapping table entries that refer to, and hence claim, the same group
 142  *      or pin, and each of these will increment the @usecount.
 143  * @mux_owner: The name of device that called pinctrl_get().
 144  * @mux_setting: The most recent selected mux setting for this pin, if any.
 145  * @gpio_owner: If pinctrl_request_gpio() was called for this pin, this is
 146  *      the name of the GPIO that "owns" this pin.
 147  */
 148 struct pin_desc {
 149         struct pinctrl_dev *pctldev;
 150         const char *name;
 151         bool dynamic_name;
 152         void *drv_data;
 153         /* These fields only added when supporting pinmux drivers */
 154 #ifdef CONFIG_PINMUX
 155         unsigned mux_usecount;
 156         const char *mux_owner;
 157         const struct pinctrl_setting_mux *mux_setting;
 158         const char *gpio_owner;
 159 #endif
 160 };
 161
 162 /**
 163  * struct pinctrl_maps - a list item containing part of the mapping table
 164  * @node: mapping table list node
 165  * @maps: array of mapping table entries
 166  * @num_maps: the number of entries in @maps
 167  */
 168 struct pinctrl_maps {
 169         struct list_head node;
 170         struct pinctrl_map const *maps;
 171         unsigned num_maps;
 172 };
 173
 174 struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name);
 175 struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np);
 176 int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);
 177 const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin);
 178 int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
 179                                const char *pin_group);
 180
 181 static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev,
 182                                             unsigned int pin)
 183 {
 184         return radix_tree_lookup(&pctldev->pin_desc_tree, pin);
 185 }
 186
 187 extern struct pinctrl_gpio_range *
 188 pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,
 189                                         unsigned int pin);
 190
 191 int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
 192                          bool dup);
 193 void pinctrl_unregister_map(struct pinctrl_map const *map);
 194
 195 extern int pinctrl_force_sleep(struct pinctrl_dev *pctldev);
 196 extern int pinctrl_force_default(struct pinctrl_dev *pctldev);
 197
 198 extern struct mutex pinctrl_maps_mutex;
 199 extern struct list_head pinctrl_maps;
 200
 201 #define for_each_maps(_maps_node_, _i_, _map_) \
 202         list_for_each_entry(_maps_node_, &pinctrl_maps, node) \
 203                 for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \
 204                         _i_ < _maps_node_->num_maps; \
 205                         _i_++, _map_ = &_maps_node_->maps[_i_])