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/*
* 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>
*
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/pinctrl/pinconf.h>
struct pinctrl_gpio_range;
/**
* 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
* @gpio_ranges: a list of GPIO ranges that is handled by this pin controller,
* ranges are added to this list at runtime
* @gpio_ranges_lock: lock for the GPIO ranges list
* @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
* @device_root: debugfs root for this device
*/
struct pinctrl_dev {
struct list_head node;
struct pinctrl_desc *desc;
struct radix_tree_root pin_desc_tree;
struct list_head gpio_ranges;
struct mutex gpio_ranges_lock;
struct device *dev;
struct module *owner;
void *driver_data;
struct pinctrl *p;
#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
* @usecount: the number of active users of this pin controller setting, used
* to keep track of nested use cases
* @pctldev: pin control device handling this pin control handle
* @mutex: a lock for the pin control state holder
* @groups: the group selectors for the pinmux device and
* selector combination handling this pinmux, this is a list that
* will be traversed on all pinmux operations such as
* get/put/enable/disable
*/
struct pinctrl {
struct list_head node;
struct device *dev;
unsigned usecount;
struct pinctrl_dev *pctldev;
struct mutex mutex;
#ifdef CONFIG_PINMUX
struct list_head groups;
#endif
};
/**
* 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
* @lock: a lock to protect the descriptor structure
* @owner: the device holding this pin or NULL of no device has claimed it
*/
struct pin_desc {
struct pinctrl_dev *pctldev;
const char *name;
bool dynamic_name;
spinlock_t lock;
/* These fields only added when supporting pinmux drivers */
#ifdef CONFIG_PINMUX
const char *owner;
#endif
};
struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name);
int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);
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);
}
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