mirror of
https://github.com/AsahiLinux/u-boot
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45 lines
894 B
C
45 lines
894 B
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2018 Rockchip Electronics Co., Ltd
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*/
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#include <common.h>
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#include <adc.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define KEY_DOWN_MIN_VAL 0
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#define KEY_DOWN_MAX_VAL 30
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/*
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* Two board variants whith adc channel 3 is for board id
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* v10: 1024, v11: 512
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* v10: adc channel 0 for dnl key
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* v11: adc channel 1 for dnl key
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*/
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int rockchip_dnl_key_pressed(void)
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{
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unsigned int key_val, id_val;
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int key_ch;
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if (adc_channel_single_shot("saradc", 3, &id_val)) {
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printf("%s read board id failed\n", __func__);
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return false;
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}
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if (abs(id_val - 1024) <= 30)
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key_ch = 0;
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else
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key_ch = 1;
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if (adc_channel_single_shot("saradc", key_ch, &key_val)) {
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printf("%s read adc key val failed\n", __func__);
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return false;
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}
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if (key_val >= KEY_DOWN_MIN_VAL && key_val <= KEY_DOWN_MAX_VAL)
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return true;
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else
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return false;
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}
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