57 lines
2.2 KiB
C
57 lines
2.2 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2013 by Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __button_lradc_imx233__
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#define __button_lradc_imx233__
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#include "button.h"
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#include "button-target.h"
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/** This driver implements button sensing with lradc. It does debouncing
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* and can handle hold sensing too. It can be tweaked using the following defines
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* and variables:
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* - imx233_button_lradc_mapping: target-defined table of adc values and mapping
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* - IMX233_BUTTON_LRADC_CHANNEL: lradc channel to use
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*/
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/* special value for btn to handle HOLD */
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#define IMX233_BUTTON_LRADC_END -1
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#define IMX233_BUTTON_LRADC_HOLD -2
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struct imx233_button_lradc_mapping_t
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{
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int adc_val;
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int btn;
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};
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/* target-defined
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* NOTE for proper operation, the table should contain entries for all states, including:
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* - one with adc_val set to default value when no button is pressed
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* - one with adc_val set to value when hold is selected (if hold is sensed using adc)
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* - a dummy entry with btn set to IMX233_BUTTON_LRADC_END as the last entry
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* The table must be sorted by increasing values of adc_val */
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extern struct imx233_button_lradc_mapping_t imx233_button_lradc_mapping[];
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void imx233_button_lradc_init(void);
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int imx233_button_lradc_read(void);
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bool imx233_button_lradc_hold(void);
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#endif /* __button_lradc_imx233__ */
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