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/* Copyright (c) 2011 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.
*/
/* ADC interface for Chrome EC */
#ifndef __CROS_EC_ADC_H
#define __CROS_EC_ADC_H
#include "common.h"
/* Value returned by adc_read_*() methods if the read failed. */
#define ADC_READ_ERROR -1
/* Minimum and maximum values returned by adc_read(). */
#define ADC_READ_MIN 0
#define ADC_READ_MAX 4095
/* ADC channels */
/* TODO: channel mapping is board-specific */
enum adc_channel {
ADC_CH_POT = 0,
};
/* Initializes the module. */
int adc_init(void);
/* Reads an ADC channel. Returns the ADC value, or ADC_READ_ERROR if error. */
int adc_read(enum adc_channel ch);
/* Returns the internal EC temperature in K, or ADC_READ_ERROR if error. */
int adc_read_ec_temperature(void);
#endif /* __CROS_EC_ADC_H */
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