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