forked from luck/tmp_suning_uos_patched
0e3db173e2
Multiple mapping table entries could reference the same pin, and hence "own" it. This would be unusual now that pinctrl_get() represents a single state for a client device, but in the future when it represents all known states for a device, this is quite likely. Implement reference counting for pin ownership to handle this. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Dong Aisheng <dong.aisheng@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
117 lines
3.7 KiB
C
117 lines
3.7 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/mutex.h>
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#include <linux/radix-tree.h>
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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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* @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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* @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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* @p: result of pinctrl_get() for 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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struct list_head gpio_ranges;
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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 pinctrl *p;
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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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* @state: the state name passed to pinctrl_get()
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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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* @settings: a list of settings for this device/state
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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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const char *state;
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unsigned usecount;
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struct list_head settings;
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};
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/**
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* struct pinctrl_setting - an individual mux setting
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* @node: list node for struct pinctrl's @settings field
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* @pctldev: pin control device handling to be programmed
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* @group_selector: the group selector to program
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* @func_selector: the function selector to program
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*/
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struct pinctrl_setting {
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struct list_head node;
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struct pinctrl_dev *pctldev;
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unsigned group_selector;
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unsigned func_selector;
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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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* @usecount: If zero, the pin is not claimed, and @owner should be NULL.
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* If non-zero, this pin is claimed by @owner. This field is an integer
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* rather than a boolean, since pinctrl_get() might process multiple
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* mapping table entries that refer to, and hence claim, the same group
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* or pin, and each of these will increment the @usecount.
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* @owner: The name of the entity owning the pin. Typically, this is the name
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* of the device that called pinctrl_get(). Alternatively, it may be the
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* name of the GPIO passed to pinctrl_request_gpio().
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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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/* These fields only added when supporting pinmux drivers */
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#ifdef CONFIG_PINMUX
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unsigned usecount;
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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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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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static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev,
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unsigned int pin)
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{
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return radix_tree_lookup(&pctldev->pin_desc_tree, pin);
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}
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extern struct mutex pinctrl_mutex;
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