106 lines
3.5 KiB
C
106 lines
3.5 KiB
C
/*
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* Core private header for the pin control subsystem
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*
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* Copyright (C) 2011 ST-Ericsson SA
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* Written on behalf of Linaro for ST-Ericsson
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/pinctrl/pinconf.h>
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struct pinctrl_gpio_range;
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/**
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* struct pinctrl_dev - pin control class device
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* @node: node to include this pin controller in the global pin controller list
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* @desc: the pin controller descriptor supplied when initializing this pin
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* controller
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* @pin_desc_tree: each pin descriptor for this pin controller is stored in
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* this radix tree
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* @pin_desc_tree_lock: lock for the descriptor tree
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* @gpio_ranges: a list of GPIO ranges that is handled by this pin controller,
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* ranges are added to this list at runtime
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* @gpio_ranges_lock: lock for the GPIO ranges list
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* @dev: the device entry for this pin controller
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* @owner: module providing the pin controller, used for refcounting
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* @driver_data: driver data for drivers registering to the pin controller
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* subsystem
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* @pinctrl_hogs_lock: lock for the pin control hog list
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* @pinctrl_hogs: list of pin control maps hogged by this device
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* @device_root: debugfs root for this device
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*/
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struct pinctrl_dev {
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struct list_head node;
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struct pinctrl_desc *desc;
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struct radix_tree_root pin_desc_tree;
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spinlock_t pin_desc_tree_lock;
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struct list_head gpio_ranges;
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struct mutex gpio_ranges_lock;
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struct device *dev;
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struct module *owner;
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void *driver_data;
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struct mutex pinctrl_hogs_lock;
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struct list_head pinctrl_hogs;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *device_root;
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#endif
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};
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/**
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* struct pinctrl - per-device pin control state holder
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* @node: global list node
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* @dev: the device using this pin control handle
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* @usecount: the number of active users of this pin controller setting, used
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* to keep track of nested use cases
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* @pctldev: pin control device handling this pin control handle
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* @mutex: a lock for the pin control state holder
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* @func_selector: the function selector for the pinmux device handling
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* this pinmux
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* @groups: the group selectors for the pinmux device and
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* selector combination handling this pinmux, this is a list that
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* will be traversed on all pinmux operations such as
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* get/put/enable/disable
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*/
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struct pinctrl {
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struct list_head node;
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struct device *dev;
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unsigned usecount;
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struct pinctrl_dev *pctldev;
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struct mutex mutex;
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#ifdef CONFIG_PINMUX
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unsigned func_selector;
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struct list_head groups;
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#endif
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};
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/**
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* struct pin_desc - pin descriptor for each physical pin in the arch
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* @pctldev: corresponding pin control device
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* @name: a name for the pin, e.g. the name of the pin/pad/finger on a
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* datasheet or such
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* @dynamic_name: if the name of this pin was dynamically allocated
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* @lock: a lock to protect the descriptor structure
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* @mux_requested: whether the pin is already requested by pinmux or not
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* @mux_function: a named muxing function for the pin that will be passed to
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* subdrivers and shown in debugfs etc
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*/
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struct pin_desc {
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struct pinctrl_dev *pctldev;
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const char *name;
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bool dynamic_name;
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spinlock_t lock;
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/* These fields only added when supporting pinmux drivers */
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#ifdef CONFIG_PINMUX
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const char *owner;
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#endif
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};
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struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name);
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struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, unsigned int pin);
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int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);
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int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
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const char *pin_group);
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