5d2eaf8090
Instead, store a pointer to the currently assigned function. This allows us to delete the mux_requested variable from pin_desc; a pin is requested if its currently assigned function is non-NULL. When a pin is requested as a GPIO rather than a regular function, the assigned function name is dynamically constructed. In this case, we have to kstrdup() the dynamically constructed name, so that mux_function doesn't pointed at stack data. This requires pin_free to be told whether to free the mux_function pointer or not. This removes the hard-coded maximum function name length. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
71 lines
2.4 KiB
C
71 lines
2.4 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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/**
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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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* @pinmux_hogs_lock: lock for the pinmux hog list
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* @pinmux_hogs: list of pinmux maps hogged by 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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#ifdef CONFIG_PINMUX
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struct mutex pinmux_hogs_lock;
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struct list_head pinmux_hogs;
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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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* @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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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_dev(struct device *dev,
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const char *dev_name);
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struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, int pin);
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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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