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30d66db787
Add a new uclass for button that implements two functions: - button_get_by_label - button_get_status Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2020 Philippe Reynes <philippe.reynes@softathome.com>
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*/
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#ifndef __BUTTON_H
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#define __BUTTON_H
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/**
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* struct button_uc_plat - Platform data the uclass stores about each device
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*
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* @label: Button label
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*/
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struct button_uc_plat {
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const char *label;
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};
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/**
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* enum button_state_t - State used for button
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* - BUTTON_OFF - Button is not pressed
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* - BUTTON_ON - Button is pressed
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* - BUTTON_COUNT - Number of button state
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*/
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enum button_state_t {
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BUTTON_OFF = 0,
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BUTTON_ON = 1,
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BUTTON_COUNT,
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};
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struct button_ops {
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/**
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* get_state() - get the state of a button
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*
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* @dev: button device to change
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* @return button state button_state_t, or -ve on error
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*/
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enum button_state_t (*get_state)(struct udevice *dev);
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};
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#define button_get_ops(dev) ((struct button_ops *)(dev)->driver->ops)
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/**
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* button_get_by_label() - Find a button device by label
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*
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* @label: button label to look up
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* @devp: Returns the associated device, if found
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* @return 0 if found, -ENODEV if not found, other -ve on error
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*/
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int button_get_by_label(const char *label, struct udevice **devp);
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/**
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* button_get_state() - get the state of a button
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*
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* @dev: button device to change
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* @return button state button_state_t, or -ve on error
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*/
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enum button_state_t button_get_state(struct udevice *dev);
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#endif
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