49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
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/* Copyright 2012 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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/* LM4-specific ADC module for Chrome EC */
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#ifndef __CROS_EC_ADC_CHIP_H
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#define __CROS_EC_ADC_CHIP_H
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enum lm4_adc_sequencer {
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LM4_ADC_SEQ0 = 0,
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LM4_ADC_SEQ1,
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LM4_ADC_SEQ2,
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LM4_ADC_SEQ3,
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LM4_ADC_SEQ_COUNT
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};
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/* Data structure to define ADC channels. */
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struct adc_t {
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const char *name;
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enum lm4_adc_sequencer sequencer;
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int factor_mul;
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int factor_div;
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int shift;
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int channel;
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int flag;
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uint32_t gpio_port;
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uint8_t gpio_mask;
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};
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/*
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* Boards must provide this list of ADC channel definitions. This must match
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* the enum adc_channel list provided by the board.
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*/
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extern const struct adc_t adc_channels[];
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/* Minimum and maximum values returned by raw ADC read. */
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#define ADC_READ_MIN 0
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#define ADC_READ_MAX 4095
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/* Just plain id mapping for code readability */
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#define LM4_AIN(x) (x)
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/* Dummy value for "channel" in adc_t if we don't have an external channel. */
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#define LM4_AIN_NONE (-1)
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#endif /* __CROS_EC_ADC_CHIP_H */
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