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  * @pin_group_tree: optionally each pin group can be stored in this radix tree
  28  * @num_groups: optionally number of groups can be kept here
  29  * @pin_function_tree: optionally each function can be stored in this radix tree
  30  * @num_functions: optionally number of functions can be kept here
  31  * @gpio_ranges: a list of GPIO ranges that is handled by this pin controller,
  32  *      ranges are added to this list at runtime
  33  * @dev: the device entry for this pin controller
  34  * @owner: module providing the pin controller, used for refcounting
  35  * @driver_data: driver data for drivers registering to the pin controller
  36  *      subsystem
  37  * @p: result of pinctrl_get() for this device
  38  * @hog_default: default state for pins hogged by this device
  39  * @hog_sleep: sleep state for pins hogged by this device
  40  * @mutex: mutex taken on each pin controller specific action
  41  * @device_root: debugfs root for this device
  42  */
  43 struct pinctrl_dev {
  44         struct list_head node;
  45         struct pinctrl_desc *desc;
  46         struct radix_tree_root pin_desc_tree;
  47 #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
  48         struct radix_tree_root pin_group_tree;
  49         unsigned int num_groups;
  50 #endif
  51 #ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS
  52         struct radix_tree_root pin_function_tree;
  53         unsigned int num_functions;
  54 #endif
  55         struct list_head gpio_ranges;
  56         struct device *dev;
  57         struct module *owner;
  58         void *driver_data;
  59         struct pinctrl *p;
  60         struct pinctrl_state *hog_default;
  61         struct pinctrl_state *hog_sleep;
  62         struct mutex mutex;
  63 #ifdef CONFIG_DEBUG_FS
  64         struct dentry *device_root;
  65 #endif
  66 };
  67
  68 /**
  69  * struct pinctrl - per-device pin control state holder
  70  * @node: global list node
  71  * @dev: the device using this pin control handle
  72  * @states: a list of states for this device
  73  * @state: the current state
  74  * @dt_maps: the mapping table chunks dynamically parsed from device tree for
  75  *      this device, if any
  76  * @users: reference count
  77  */
  78 struct pinctrl {
  79         struct list_head node;
  80         struct device *dev;
  81         struct list_head states;
  82         struct pinctrl_state *state;
  83         struct list_head dt_maps;
  84         struct kref users;
  85 };
  86
  87 /**
  88  * struct pinctrl_state - a pinctrl state for a device
  89  * @node: list node for struct pinctrl's @states field
  90  * @name: the name of this state
  91  * @settings: a list of settings for this state
  92  */
  93 struct pinctrl_state {
  94         struct list_head node;
  95         const char *name;
  96         struct list_head settings;
  97 };
  98
  99 /**
 100  * struct pinctrl_setting_mux - setting data for MAP_TYPE_MUX_GROUP
 101  * @group: the group selector to program
 102  * @func: the function selector to program
 103  */
 104 struct pinctrl_setting_mux {
 105         unsigned group;
 106         unsigned func;
 107 };
 108
 109 /**
 110  * struct pinctrl_setting_configs - setting data for MAP_TYPE_CONFIGS_*
 111  * @group_or_pin: the group selector or pin ID to program
 112  * @configs: a pointer to an array of config parameters/values to program into
 113  *      hardware. Each individual pin controller defines the format and meaning
 114  *      of config parameters.
 115  * @num_configs: the number of entries in array @configs
 116  */
 117 struct pinctrl_setting_configs {
 118         unsigned group_or_pin;
 119         unsigned long *configs;
 120         unsigned num_configs;
 121 };
 122
 123 /**
 124  * struct pinctrl_setting - an individual mux or config setting
 125  * @node: list node for struct pinctrl_settings's @settings field
 126  * @type: the type of setting
 127  * @pctldev: pin control device handling to be programmed. Not used for
 128  *   PIN_MAP_TYPE_DUMMY_STATE.
 129  * @dev_name: the name of the device using this state
 130  * @data: Data specific to the setting type
 131  */
 132 struct pinctrl_setting {
 133         struct list_head node;
 134         enum pinctrl_map_type type;
 135         struct pinctrl_dev *pctldev;
 136         const char *dev_name;
 137         union {
 138                 struct pinctrl_setting_mux mux;
 139                 struct pinctrl_setting_configs configs;
 140         } data;
 141 };
 142
 143 /**
 144  * struct pin_desc - pin descriptor for each physical pin in the arch
 145  * @pctldev: corresponding pin control device
 146  * @name: a name for the pin, e.g. the name of the pin/pad/finger on a
 147  *      datasheet or such
 148  * @dynamic_name: if the name of this pin was dynamically allocated
 149  * @drv_data: driver-defined per-pin data. pinctrl core does not touch this
 150  * @mux_usecount: If zero, the pin is not claimed, and @owner should be NULL.
 151  *      If non-zero, this pin is claimed by @owner. This field is an integer
 152  *      rather than a boolean, since pinctrl_get() might process multiple
 153  *      mapping table entries that refer to, and hence claim, the same group
 154  *      or pin, and each of these will increment the @usecount.
 155  * @mux_owner: The name of device that called pinctrl_get().
 156  * @mux_setting: The most recent selected mux setting for this pin, if any.
 157  * @gpio_owner: If pinctrl_request_gpio() was called for this pin, this is
 158  *      the name of the GPIO that "owns" this pin.
 159  */
 160 struct pin_desc {
 161         struct pinctrl_dev *pctldev;
 162         const char *name;
 163         bool dynamic_name;
 164         void *drv_data;
 165         /* These fields only added when supporting pinmux drivers */
 166 #ifdef CONFIG_PINMUX
 167         unsigned mux_usecount;
 168         const char *mux_owner;
 169         const struct pinctrl_setting_mux *mux_setting;
 170         const char *gpio_owner;
 171 #endif
 172 };
 173
 174 /**
 175  * struct pinctrl_maps - a list item containing part of the mapping table
 176  * @node: mapping table list node
 177  * @maps: array of mapping table entries
 178  * @num_maps: the number of entries in @maps
 179  */
 180 struct pinctrl_maps {
 181         struct list_head node;
 182         struct pinctrl_map const *maps;
 183         unsigned num_maps;
 184 };
 185
 186 #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
 187
 188 /**
 189  * struct group_desc - generic pin group descriptor
 190  * @name: name of the pin group
 191  * @pins: array of pins that belong to the group
 192  * @num_pins: number of pins in the group
 193  * @data: pin controller driver specific data
 194  */
 195 struct group_desc {
 196         const char *name;
 197         int *pins;
 198         int num_pins;
 199         void *data;
 200 };
 201
 202 int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev);
 203
 204 const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev,
 205                                            unsigned int group_selector);
 206
 207 int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev,
 208                                    unsigned int group_selector,
 209                                    const unsigned int **pins,
 210                                    unsigned int *npins);
 211
 212 struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev,
 213                                              unsigned int group_selector);
 214
 215 int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name,
 216                               int *gpins, int ngpins, void *data);
 217
 218 int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev,
 219                                  unsigned int group_selector);
 220
 221 static inline int
 222 pinctrl_generic_remove_last_group(struct pinctrl_dev *pctldev)
 223 {
 224         return pinctrl_generic_remove_group(pctldev, pctldev->num_groups - 1);
 225 }
 226
 227 #endif  /* CONFIG_GENERIC_PINCTRL_GROUPS */
 228
 229 struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name);
 230 struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np);
 231 int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);
 232 const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin);
 233 int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
 234                                const char *pin_group);
 235
 236 static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev,
 237                                             unsigned int pin)
 238 {
 239         return radix_tree_lookup(&pctldev->pin_desc_tree, pin);
 240 }
 241
 242 extern struct pinctrl_gpio_range *
 243 pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,
 244                                         unsigned int pin);
 245
 246 int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
 247                          bool dup);
 248 void pinctrl_unregister_map(struct pinctrl_map const *map);
 249
 250 extern int pinctrl_force_sleep(struct pinctrl_dev *pctldev);
 251 extern int pinctrl_force_default(struct pinctrl_dev *pctldev);
 252
 253 extern struct mutex pinctrl_maps_mutex;
 254 extern struct list_head pinctrl_maps;
 255
 256 #define for_each_maps(_maps_node_, _i_, _map_) \
 257         list_for_each_entry(_maps_node_, &pinctrl_maps, node) \
 258                 for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \
 259                         _i_ < _maps_node_->num_maps; \
 260                         _i_++, _map_ = &_maps_node_->maps[_i_])