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Current File : //proc/16354/root/lib/modules/3.10.0-957.10.1.el7.x86_64/source/include/linux/pinctrl/pinmux.h
/*
 * Interface the pinmux subsystem
 *
 * Copyright (C) 2011 ST-Ericsson SA
 * Written on behalf of Linaro for ST-Ericsson
 * Based on bits of regulator core, gpio core and clk core
 *
 * Author: Linus Walleij <linus.walleij@linaro.org>
 *
 * License terms: GNU General Public License (GPL) version 2
 */
#ifndef __LINUX_PINCTRL_PINMUX_H
#define __LINUX_PINCTRL_PINMUX_H

#include <linux/list.h>
#include <linux/seq_file.h>
#include <linux/pinctrl/pinctrl.h>

#ifdef CONFIG_PINMUX

struct pinctrl_dev;

/**
 * struct pinmux_ops - pinmux operations, to be implemented by pin controller
 * drivers that support pinmuxing
 * @request: called by the core to see if a certain pin can be made
 *	available for muxing. This is called by the core to acquire the pins
 *	before selecting any actual mux setting across a function. The driver
 *	is allowed to answer "no" by returning a negative error code
 * @free: the reverse function of the request() callback, frees a pin after
 *	being requested
 * @get_functions_count: returns number of selectable named functions available
 *	in this pinmux driver
 * @get_function_name: return the function name of the muxing selector,
 *	called by the core to figure out which mux setting it shall map a
 *	certain device to
 * @get_function_groups: return an array of groups names (in turn
 *	referencing pins) connected to a certain function selector. The group
 *	name can be used with the generic @pinctrl_ops to retrieve the
 *	actual pins affected. The applicable groups will be returned in
 *	@groups and the number of groups in @num_groups
 * @enable: enable a certain muxing function with a certain pin group. The
 *	driver does not need to figure out whether enabling this function
 *	conflicts some other use of the pins in that group, such collisions
 *	are handled by the pinmux subsystem. The @func_selector selects a
 *	certain function whereas @group_selector selects a certain set of pins
 *	to be used. On simple controllers the latter argument may be ignored
 * @disable: disable a certain muxing selector with a certain pin group
 * @gpio_request_enable: requests and enables GPIO on a certain pin.
 *	Implement this only if you can mux every pin individually as GPIO. The
 *	affected GPIO range is passed along with an offset(pin number) into that
 *	specific GPIO range - function selectors and pin groups are orthogonal
 *	to this, the core will however make sure the pins do not collide.
 * @gpio_disable_free: free up GPIO muxing on a certain pin, the reverse of
 *	@gpio_request_enable
 * @gpio_set_direction: Since controllers may need different configurations
 *	depending on whether the GPIO is configured as input or output,
 *	a direction selector function may be implemented as a backing
 *	to the GPIO controllers that need pin muxing.
 */
struct pinmux_ops {
	int (*request) (struct pinctrl_dev *pctldev, unsigned offset);
	int (*free) (struct pinctrl_dev *pctldev, unsigned offset);
	int (*get_functions_count) (struct pinctrl_dev *pctldev);
	const char *(*get_function_name) (struct pinctrl_dev *pctldev,
					  unsigned selector);
	int (*get_function_groups) (struct pinctrl_dev *pctldev,
				  unsigned selector,
				  const char * const **groups,
				  unsigned * const num_groups);
	int (*enable) (struct pinctrl_dev *pctldev, unsigned func_selector,
		       unsigned group_selector);
	void (*disable) (struct pinctrl_dev *pctldev, unsigned func_selector,
			 unsigned group_selector);
	int (*gpio_request_enable) (struct pinctrl_dev *pctldev,
				    struct pinctrl_gpio_range *range,
				    unsigned offset);
	void (*gpio_disable_free) (struct pinctrl_dev *pctldev,
				   struct pinctrl_gpio_range *range,
				   unsigned offset);
	int (*gpio_set_direction) (struct pinctrl_dev *pctldev,
				   struct pinctrl_gpio_range *range,
				   unsigned offset,
				   bool input);
};

#endif /* CONFIG_PINMUX */

#endif /* __LINUX_PINCTRL_PINMUX_H */

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