diff options
| author | Randall Spangler <rspangler@chromium.org> | 2011-12-07 18:51:09 +0000 |
|---|---|---|
| committer | Vincent Palatin <vpalatin@chromium.org> | 2011-12-07 19:10:02 +0000 |
| commit | bdf7da5b082f6d18dd27f1e5d8cca0b12154a28c (patch) | |
| tree | 6f14312a6cc70d056efc2bede8728c0868266719 /include/adc.h | |
| parent | abe5786058f4b60dc6d30e7d7c964aae850caa1f (diff) | |
| download | chrome-ec-bdf7da5b082f6d18dd27f1e5d8cca0b12154a28c.tar.gz | |
Initial sources import 1/3
source files mainly done by Randall.
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Change-Id: Iaff83a842b17f3350fb6f2a3f1597ad4c29bd12a
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 */ |