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source files mainly done by Randall. Signed-off-by: Randall Spangler <rspangler@chromium.org> Change-Id: Iaff83a842b17f3350fb6f2a3f1597ad4c29bd12a
36 lines
895 B
C
36 lines
895 B
C
/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* ADC interface for Chrome EC */
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#ifndef __CROS_EC_ADC_H
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#define __CROS_EC_ADC_H
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#include "common.h"
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/* Value returned by adc_read_*() methods if the read failed. */
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#define ADC_READ_ERROR -1
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/* Minimum and maximum values returned by adc_read(). */
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#define ADC_READ_MIN 0
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#define ADC_READ_MAX 4095
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/* ADC channels */
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/* TODO: channel mapping is board-specific */
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enum adc_channel {
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ADC_CH_POT = 0,
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};
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/* Initializes the module. */
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int adc_init(void);
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/* Reads an ADC channel. Returns the ADC value, or ADC_READ_ERROR if error. */
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int adc_read(enum adc_channel ch);
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/* Returns the internal EC temperature in K, or ADC_READ_ERROR if error. */
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int adc_read_ec_temperature(void);
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#endif /* __CROS_EC_ADC_H */
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