1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * (C) Copyright 2018 Rockchip Electronics Co., Ltd 3*4882a593Smuzhiyun * 4*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #include <common.h> 8*4882a593Smuzhiyun #include <adc.h> 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun DECLARE_GLOBAL_DATA_PTR; 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun #define KEY_DOWN_MIN_VAL 0 13*4882a593Smuzhiyun #define KEY_DOWN_MAX_VAL 30 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun /* 16*4882a593Smuzhiyun * Two board variants whith adc channel 3 is for board id 17*4882a593Smuzhiyun * v10: 1024, v11: 512 18*4882a593Smuzhiyun * v10: adc channel 0 for dnl key 19*4882a593Smuzhiyun * v11: adc channel 1 for dnl key 20*4882a593Smuzhiyun */ rockchip_dnl_key_pressed(void)21*4882a593Smuzhiyunint rockchip_dnl_key_pressed(void) 22*4882a593Smuzhiyun { 23*4882a593Smuzhiyun unsigned int key_val, id_val; 24*4882a593Smuzhiyun int key_ch; 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun if (adc_channel_single_shot("saradc", 3, &id_val)) { 27*4882a593Smuzhiyun printf("%s read board id failed\n", __func__); 28*4882a593Smuzhiyun return false; 29*4882a593Smuzhiyun } 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun if (abs(id_val - 1024) <= 30) 32*4882a593Smuzhiyun key_ch = 0; 33*4882a593Smuzhiyun else 34*4882a593Smuzhiyun key_ch = 1; 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun if (adc_channel_single_shot("saradc", key_ch, &key_val)) { 37*4882a593Smuzhiyun printf("%s read adc key val failed\n", __func__); 38*4882a593Smuzhiyun return false; 39*4882a593Smuzhiyun } 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun if ((key_val >= KEY_DOWN_MIN_VAL) && (key_val <= KEY_DOWN_MAX_VAL)) 42*4882a593Smuzhiyun return true; 43*4882a593Smuzhiyun else 44*4882a593Smuzhiyun return false; 45*4882a593Smuzhiyun } 46