1 /* 2 * (C) Copyright 2018 Rockchip Electronics Co., Ltd 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <adc.h> 9 10 DECLARE_GLOBAL_DATA_PTR; 11 12 #define KEY_DOWN_MIN_VAL 0 13 #define KEY_DOWN_MAX_VAL 30 14 15 /* 16 * Two board variants whith adc channel 3 is for board id 17 * v10: 1024, v11: 512 18 * v10: adc channel 0 for dnl key 19 * v11: adc channel 1 for dnl key 20 */ rockchip_dnl_key_pressed(void)21int rockchip_dnl_key_pressed(void) 22 { 23 unsigned int key_val, id_val; 24 int key_ch; 25 26 if (adc_channel_single_shot("saradc", 3, &id_val)) { 27 printf("%s read board id failed\n", __func__); 28 return false; 29 } 30 31 if (abs(id_val - 1024) <= 30) 32 key_ch = 0; 33 else 34 key_ch = 1; 35 36 if (adc_channel_single_shot("saradc", key_ch, &key_val)) { 37 printf("%s read adc key val failed\n", __func__); 38 return false; 39 } 40 41 if ((key_val >= KEY_DOWN_MIN_VAL) && (key_val <= KEY_DOWN_MAX_VAL)) 42 return true; 43 else 44 return false; 45 } 46