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befe5bdfbb
This moves the per-devices struct pinctrl handles and device map over from the pinmux part of the subsystem to the core pinctrl part. This makes the device handles core infrastructure with the goal of using these handles also for pin configuration, so that device drivers (or boards etc) will need one and only one handle to the pin control core. Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
108 lines
3.6 KiB
C
108 lines
3.6 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 *mux_function;
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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_device_gpio_range(unsigned gpio,
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struct pinctrl_dev **outdev,
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struct pinctrl_gpio_range **outrange);
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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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