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/* Copyright 2015 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* EC_ADC driver for Chrome EC */
#include "adc.h"
#include "common.h"
#include "console.h"
#include "ec_adc.h"
#include "temp_sensor/thermistor.h"
#include "util.h"
/* Get temperature from requested sensor */
static int get_temp(int idx, int *temp_ptr)
{
int temp_raw = 0;
/* Read 10-bit ADC result */
temp_raw = adc_read_channel(idx);
if (temp_raw == ADC_READ_ERROR)
return EC_ERROR_UNKNOWN;
/* TODO : Need modification here if the result is not 10-bit */
/* If there is no thermistor calculation function.
* 1. Add adjusting function like thermistor_ncp15wb.c
* 2. Place function here with ifdef
* 3. define it on board.h
*/
#ifdef CONFIG_THERMISTOR_NCP15WB
*temp_ptr = ncp15wb_calculate_temp((uint16_t) temp_raw);
#else
#error "Unknown thermistor for ec_adc"
return EC_ERROR_UNKNOWN;
#endif
return EC_SUCCESS;
}
int ec_adc_get_val(int idx, int *temp_ptr)
{
int ret;
int temp_c;
if(idx < 0 || idx >= ADC_CH_COUNT)
return EC_ERROR_INVAL;
ret = get_temp(idx, &temp_c);
if (ret == EC_SUCCESS)
*temp_ptr = C_TO_K(temp_c);
return ret;
}
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