/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Core private header for the pin control subsystem
*
* Copyright ( C ) 2011 ST - Ericsson SA
* Written on behalf of Linaro for ST - Ericsson
*
* Author : Linus Walleij < linus . walleij @ linaro . org >
*/
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/radix-tree.h>
#include <linux/types.h>
#include <linux/pinctrl/machine.h>
struct dentry;
struct device;
struct device_node;
struct module;
struct pinctrl;
struct pinctrl_desc;
struct pinctrl_gpio_range;
struct pinctrl_state;
/**
* struct pinctrl_dev - pin control class device
* @ node : node to include this pin controller in the global pin controller list
* @ desc : the pin controller descriptor supplied when initializing this pin
* controller
* @ pin_desc_tree : each pin descriptor for this pin controller is stored in
* this radix tree
* @ pin_group_tree : optionally each pin group can be stored in this radix tree
* @ num_groups : optionally number of groups can be kept here
* @ pin_function_tree : optionally each function can be stored in this radix tree
* @ num_functions : optionally number of functions can be kept here
* @ gpio_ranges : a list of GPIO ranges that is handled by this pin controller ,
* ranges are added to this list at runtime
* @ dev : the device entry for this pin controller
* @ owner : module providing the pin controller , used for refcounting
* @ driver_data : driver data for drivers registering to the pin controller
* subsystem
* @ p : result of pinctrl_get ( ) for this device
* @ hog_default : default state for pins hogged by this device
* @ hog_sleep : sleep state for pins hogged by this device
* @ mutex : mutex taken on each pin controller specific action
* @ device_root : debugfs root for this device
*/
struct pinctrl_dev {
struct list_head node;
const struct pinctrl_desc *desc;
struct radix_tree_root pin_desc_tree;
#ifdef CONFIG_GENERIC_PINCTRL_GROUPS
struct radix_tree_root pin_group_tree;
unsigned int num_groups;
#endif
#ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS
struct radix_tree_root pin_function_tree;
unsigned int num_functions;
#endif
struct list_head gpio_ranges;
struct device *dev;
struct module *owner;
void *driver_data;
struct pinctrl *p;
struct pinctrl_state *hog_default;
struct pinctrl_state *hog_sleep;
struct mutex mutex;
#ifdef CONFIG_DEBUG_FS
struct dentry *device_root;
#endif
};
/**
* struct pinctrl - per - device pin control state holder
* @ node : global list node
* @ dev : the device using this pin control handle
* @ states : a list of states for this device
* @ state : the current state
* @ dt_maps : the mapping table chunks dynamically parsed from device tree for
* this device , if any
* @ users : reference count
*/
struct pinctrl {
struct list_head node;
struct device *dev;
struct list_head states;
struct pinctrl_state *state;
struct list_head dt_maps;
struct kref users;
};
/**
* struct pinctrl_state - a pinctrl state for a device
* @ node : list node for struct pinctrl ' s @ states field
* @ name : the name of this state
* @ settings : a list of settings for this state
*/
struct pinctrl_state {
struct list_head node;
const char *name;
struct list_head settings;
};
/**
* struct pinctrl_setting_mux - setting data for MAP_TYPE_MUX_GROUP
* @ group : the group selector to program
* @ func : the function selector to program
*/
struct pinctrl_setting_mux {
unsigned int group;
unsigned int func;
};
/**
* struct pinctrl_setting_configs - setting data for MAP_TYPE_CONFIGS_ *
* @ group_or_pin : the group selector or pin ID to program
* @ configs : a pointer to an array of config parameters / values to program into
* hardware . Each individual pin controller defines the format and meaning
* of config parameters .
* @ num_configs : the number of entries in array @ configs
*/
struct pinctrl_setting_configs {
unsigned int group_or_pin;
unsigned long *configs;
unsigned int num_configs;
};
/**
* struct pinctrl_setting - an individual mux or config setting
* @ node : list node for struct pinctrl_settings ' s @ settings field
* @ type : the type of setting
* @ pctldev : pin control device handling to be programmed . Not used for
* PIN_MAP_TYPE_DUMMY_STATE .
* @ dev_name : the name of the device using this state
* @ data : Data specific to the setting type
*/
struct pinctrl_setting {
struct list_head node;
enum pinctrl_map_type type;
struct pinctrl_dev *pctldev;
const char *dev_name;
union {
struct pinctrl_setting_mux mux;
struct pinctrl_setting_configs configs;
} data;
};
/**
* struct pin_desc - pin descriptor for each physical pin in the arch
* @ pctldev : corresponding pin control device
* @ name : a name for the pin , e . g . the name of the pin / pad / finger on a
* datasheet or such
* @ dynamic_name : if the name of this pin was dynamically allocated
* @ drv_data : driver - defined per - pin data . pinctrl core does not touch this
* @ mux_usecount : If zero , the pin is not claimed , and @ owner should be NULL .
* If non - zero , this pin is claimed by @ owner . This field is an integer
* rather than a boolean , since pinctrl_get ( ) might process multiple
* mapping table entries that refer to , and hence claim , the same group
* or pin , and each of these will increment the @ usecount .
* @ mux_owner : The name of device that called pinctrl_get ( ) .
* @ mux_setting : The most recent selected mux setting for this pin , if any .
* @ gpio_owner : If pinctrl_gpio_request ( ) was called for this pin , this is
* the name of the GPIO that " owns " this pin .
*/
struct pin_desc {
struct pinctrl_dev *pctldev;
const char *name;
bool dynamic_name;
void *drv_data;
/* These fields only added when supporting pinmux drivers */
#ifdef CONFIG_PINMUX
unsigned int mux_usecount;
const char *mux_owner;
const struct pinctrl_setting_mux *mux_setting;
const char *gpio_owner;
struct mutex mux_lock;
#endif
};
/**
* struct pinctrl_maps - a list item containing part of the mapping table
* @ node : mapping table list node
* @ maps : array of mapping table entries
* @ num_maps : the number of entries in @ maps
*/
struct pinctrl_maps {
struct list_head node;
const struct pinctrl_map *maps;
unsigned int num_maps;
};
#ifdef CONFIG_GENERIC_PINCTRL_GROUPS
#include <linux/pinctrl/pinctrl.h>
/**
* struct group_desc - generic pin group descriptor
* @ grp : generic data of the pin group ( name and pins )
* @ data : pin controller driver specific data
*/
struct group_desc {
struct pingroup grp;
void *data;
};
/* Convenient macro to define a generic pin group descriptor */
#define PINCTRL_GROUP_DESC(_name, _pins, _num_pins, _data) \
(struct group_desc) { \
.grp = PINCTRL_PINGROUP(_name, _pins, _num_pins), \
.data = _data, \
}
int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev);
const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev,
unsigned int group_selector);
int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev,
unsigned int group_selector,
const unsigned int **pins,
unsigned int *npins);
struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev,
unsigned int group_selector);
int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name,
const unsigned int *pins, int num_pins, void *data);
int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev,
unsigned int group_selector);
#endif /* CONFIG_GENERIC_PINCTRL_GROUPS */
struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name);
struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np);
int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);
const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned int pin);
int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
const char *pin_group);
static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev,
unsigned int pin)
{
return radix_tree_lookup(&pctldev->pin_desc_tree, pin);
}
extern struct pinctrl_gpio_range *
pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,
unsigned int pin);
extern int pinctrl_force_sleep(struct pinctrl_dev *pctldev);
extern int pinctrl_force_default(struct pinctrl_dev *pctldev);
extern struct mutex pinctrl_maps_mutex;
extern struct list_head pinctrl_maps;
#define for_each_pin_map(_maps_node_, _map_) \
list_for_each_entry(_maps_node_, &pinctrl_maps, node) \
for (unsigned int __i = 0 ; \
__i < _maps_node_->num_maps && (_map_ = &_maps_node_->maps[__i]); \
__i++)
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