diff options
Diffstat (limited to 'include/adc.h')
-rw-r--r-- | include/adc.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/include/adc.h b/include/adc.h new file mode 100644 index 0000000000..1f01f2c08f --- /dev/null +++ b/include/adc.h @@ -0,0 +1,35 @@ +/* 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 */ |