28a8d14cc7
This breaks out a <linux/pinctrl/consumer.h> header to be used by all pinmux and pinconfig alike, so drivers needing services from pinctrl does not need to include different headers. This is similar to the approach taken by the regulator API. Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
90 lines
3.9 KiB
C
90 lines
3.9 KiB
C
/*
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* Interface the pinmux 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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* Based on bits of regulator core, gpio core and clk core
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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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#ifndef __LINUX_PINCTRL_PINMUX_H
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#define __LINUX_PINCTRL_PINMUX_H
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#include <linux/list.h>
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#include <linux/seq_file.h>
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#include "pinctrl.h"
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#ifdef CONFIG_PINMUX
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struct pinctrl_dev;
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/**
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* struct pinmux_ops - pinmux operations, to be implemented by pin controller
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* drivers that support pinmuxing
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* @request: called by the core to see if a certain pin can be made available
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* available for muxing. This is called by the core to acquire the pins
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* before selecting any actual mux setting across a function. The driver
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* is allowed to answer "no" by returning a negative error code
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* @free: the reverse function of the request() callback, frees a pin after
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* being requested
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* @list_functions: list the number of selectable named functions available
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* in this pinmux driver, the core will begin on 0 and call this
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* repeatedly as long as it returns >= 0 to enumerate mux settings
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* @get_function_name: return the function name of the muxing selector,
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* called by the core to figure out which mux setting it shall map a
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* certain device to
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* @get_function_groups: return an array of groups names (in turn
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* referencing pins) connected to a certain function selector. The group
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* name can be used with the generic @pinctrl_ops to retrieve the
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* actual pins affected. The applicable groups will be returned in
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* @groups and the number of groups in @num_groups
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* @enable: enable a certain muxing function with a certain pin group. The
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* driver does not need to figure out whether enabling this function
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* conflicts some other use of the pins in that group, such collisions
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* are handled by the pinmux subsystem. The @func_selector selects a
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* certain function whereas @group_selector selects a certain set of pins
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* to be used. On simple controllers the latter argument may be ignored
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* @disable: disable a certain muxing selector with a certain pin group
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* @gpio_request_enable: requests and enables GPIO on a certain pin.
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* Implement this only if you can mux every pin individually as GPIO. The
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* affected GPIO range is passed along with an offset(pin number) into that
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* specific GPIO range - function selectors and pin groups are orthogonal
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* to this, the core will however make sure the pins do not collide.
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* @gpio_disable_free: free up GPIO muxing on a certain pin, the reverse of
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* @gpio_request_enable
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* @gpio_set_direction: Since controllers may need different configurations
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* depending on whether the GPIO is configured as input or output,
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* a direction selector function may be implemented as a backing
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* to the GPIO controllers that need pin muxing.
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*/
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struct pinmux_ops {
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int (*request) (struct pinctrl_dev *pctldev, unsigned offset);
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int (*free) (struct pinctrl_dev *pctldev, unsigned offset);
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int (*list_functions) (struct pinctrl_dev *pctldev, unsigned selector);
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const char *(*get_function_name) (struct pinctrl_dev *pctldev,
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unsigned selector);
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int (*get_function_groups) (struct pinctrl_dev *pctldev,
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unsigned selector,
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const char * const **groups,
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unsigned * const num_groups);
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int (*enable) (struct pinctrl_dev *pctldev, unsigned func_selector,
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unsigned group_selector);
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void (*disable) (struct pinctrl_dev *pctldev, unsigned func_selector,
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unsigned group_selector);
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int (*gpio_request_enable) (struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range,
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unsigned offset);
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void (*gpio_disable_free) (struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range,
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unsigned offset);
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int (*gpio_set_direction) (struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range,
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unsigned offset,
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bool input);
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};
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#endif /* CONFIG_PINMUX */
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#endif /* __LINUX_PINCTRL_PINMUX_H */
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