forked from rrcarlosr/Jetpack
289 lines
9.7 KiB
C
289 lines
9.7 KiB
C
/*
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* Copyright (C) 2015 Samsung Electronics
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* Przemyslaw Marczak <p.marczak@samsung.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _ADC_H_
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#define _ADC_H_
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/* ADC_CHANNEL() - ADC channel bit mask, to select only required channels */
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#define ADC_CHANNEL(x) (1 << x)
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/* The last possible selected channel with 32-bit mask */
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#define ADC_MAX_CHANNEL 31
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/**
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* adc_data_format: define the ADC output data format, can be useful when
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* the device's input Voltage range is bipolar.
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* - ADC_DATA_FORMAT_BIN - binary offset
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* - ADC_DATA_FORMAT_2S - two's complement
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*
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* Note: Device's driver should fill the 'data_format' field of its uclass's
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* platform data using one of the above data format types.
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*/
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enum adc_data_format {
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ADC_DATA_FORMAT_BIN,
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ADC_DATA_FORMAT_2S,
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};
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/**
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* struct adc_channel - structure to hold channel conversion data.
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* Useful to keep the result of a multi-channel conversion output.
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*
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* @id - channel id
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* @data - channel conversion data
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*/
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struct adc_channel {
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int id;
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unsigned int data;
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};
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/**
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* struct adc_uclass_platdata - basic ADC info
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*
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* Note: The positive/negative reference Voltage is only a name and it doesn't
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* provide an information about the value polarity. It is possible, for both
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* values to be a negative or positive. For this purpose the uclass's platform
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* data provides a bool fields: 'vdd/vss_supply_is_negative'. This is useful,
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* since the regulator API returns only a positive Voltage values.
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*
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* To get the reference Voltage values with polarity, use functions:
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* - adc_vdd_value()
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* - adc_vss_value()
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* Those are useful for some cases of ADC's references, e.g.:
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* * Vdd: +3.3V; Vss: -3.3V -> 6.6 Vdiff
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* * Vdd: +3.3V; Vss: +0.3V -> 3.0 Vdiff
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* * Vdd: +3.3V; Vss: 0.0V -> 3.3 Vdiff
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* The last one is usually standard and doesn't require the fdt polarity info.
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*
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* For more informations read binding info:
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* - doc/device-tree-bindings/adc/adc.txt
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*
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* @data_mask - conversion output data mask
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* @data_timeout_us - single channel conversion timeout
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* @multidata_timeout_us - multi channel conversion timeout
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* @channel_mask - bit mask of available channels [0:31]
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* @vdd_supply - positive reference Voltage supply (regulator)
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* @vss_supply - negative reference Voltage supply (regulator)
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* @vdd_polarity_negative - positive reference Voltage has negative polarity
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* @vss_polarity_negative - negative reference Voltage has negative polarity
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* @vdd_microvolts - positive reference Voltage value
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* @vss_microvolts - negative reference Voltage value
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*/
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struct adc_uclass_platdata {
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int data_format;
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unsigned int data_mask;
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unsigned int data_timeout_us;
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unsigned int multidata_timeout_us;
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unsigned int channel_mask;
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struct udevice *vdd_supply;
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struct udevice *vss_supply;
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bool vdd_polarity_negative;
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bool vss_polarity_negative;
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int vdd_microvolts;
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int vss_microvolts;
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};
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/**
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* struct adc_ops - ADC device operations for single/multi-channel operation.
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*/
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struct adc_ops {
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/**
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* start_channel() - start conversion with its default parameters
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* for the given channel number.
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*
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* @dev: ADC device to init
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* @channel: analog channel number
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* @return: 0 if OK, -ve on error
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*/
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int (*start_channel)(struct udevice *dev, int channel);
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/**
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* start_channels() - start conversion with its default parameters
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* for the channel numbers selected by the bit mask.
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*
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* This is optional, useful when the hardware supports multichannel
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* conversion by the single software trigger.
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*
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* @dev: ADC device to init
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* @channel_mask: bit mask of selected analog channels
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* @return: 0 if OK, -ve on error
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*/
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int (*start_channels)(struct udevice *dev, unsigned int channel_mask);
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/**
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* channel_data() - get conversion output data for the given channel.
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*
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* Note: The implementation of this function should only check, that
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* the conversion data is available at the call time. If the hardware
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* requires some delay to get the data, then this function should
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* return with -EBUSY value. The ADC API will call it in a loop,
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* until the data is available or the timeout expires. The maximum
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* timeout for this operation is defined by the field 'data_timeout_us'
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* in ADC uclasses platform data structure.
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*
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* @dev: ADC device to trigger
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* @channel: selected analog channel number
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* @data: returned pointer to selected channel's output data
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* @return: 0 if OK, -EBUSY if busy, and other negative on error
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*/
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int (*channel_data)(struct udevice *dev, int channel,
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unsigned int *data);
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/**
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* channels_data() - get conversion data for the selected channels.
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*
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* This is optional, useful when multichannel conversion is supported
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* by the hardware, by the single software trigger.
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*
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* For the proper implementation, please look at the 'Note' for the
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* above method. The only difference is in used timeout value, which
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* is defined by field 'multidata_timeout_us'.
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*
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* @dev: ADC device to trigger
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* @channel_mask: bit mask of selected analog channels
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* @channels: returned pointer to array of output data for channels
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* selected by the given mask
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* @return: 0 if OK, -ve on error
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*/
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int (*channels_data)(struct udevice *dev, unsigned int channel_mask,
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struct adc_channel *channels);
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/**
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* stop() - stop conversion of the given ADC device
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*
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* @dev: ADC device to stop
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* @return: 0 if OK, -ve on error
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*/
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int (*stop)(struct udevice *dev);
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};
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/**
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* adc_start_channel() - start conversion for given device/channel and exit.
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*
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* @dev: ADC device
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* @channel: analog channel number
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* @return: 0 if OK, -ve on error
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*/
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int adc_start_channel(struct udevice *dev, int channel);
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/**
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* adc_start_channels() - start conversion for given device/channels and exit.
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*
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* Note:
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* To use this function, device must implement method: start_channels().
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*
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* @dev: ADC device to start
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* @channel_mask: channel selection - a bit mask
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* @channel_mask: bit mask of analog channels
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* @return: 0 if OK, -ve on error
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*/
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int adc_start_channels(struct udevice *dev, unsigned int channel_mask);
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/**
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* adc_channel_data() - get conversion data for the given device channel number.
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*
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* @dev: ADC device to read
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* @channel: analog channel number
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* @data: pointer to returned channel's data
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* @return: 0 if OK, -ve on error
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*/
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int adc_channel_data(struct udevice *dev, int channel, unsigned int *data);
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/**
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* adc_channels_data() - get conversion data for the channels selected by mask
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*
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* Note:
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* To use this function, device must implement methods:
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* - start_channels()
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* - channels_data()
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*
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* @dev: ADC device to read
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* @channel_mask: channel selection - a bit mask
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* @channels: pointer to structure array of returned data for each channel
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* @return: 0 if OK, -ve on error
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*/
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int adc_channels_data(struct udevice *dev, unsigned int channel_mask,
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struct adc_channel *channels);
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/**
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* adc_data_mask() - get data mask (ADC resolution bitmask) for given ADC device
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*
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* This can be used if adc uclass platform data is filled.
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*
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* @dev: ADC device to check
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* @data_mask: pointer to the returned data bitmask
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* @return: 0 if OK, -ve on error
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*/
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int adc_data_mask(struct udevice *dev, unsigned int *data_mask);
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/**
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* adc_channel_single_shot() - get output data of conversion for the ADC
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* device's channel. This function searches for the device with the given name,
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* starts the given channel conversion and returns the output data.
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*
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* Note: To use this function, device must implement metods:
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* - start_channel()
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* - channel_data()
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*
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* @name: device's name to search
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* @channel: device's input channel to init
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* @data: pointer to conversion output data
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* @return: 0 if OK, -ve on error
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*/
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int adc_channel_single_shot(const char *name, int channel, unsigned int *data);
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/**
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* adc_channels_single_shot() - get ADC conversion output data for the selected
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* device's channels. This function searches for the device by the given name,
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* starts the selected channels conversion and returns the output data as array
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* of type 'struct adc_channel'.
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*
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* Note: This function can be used if device implements one of ADC's single
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* or multi-channel operation API. If multi-channel operation is not supported,
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* then each selected channel is triggered by the sequence start/data in a loop.
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*
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* @name: device's name to search
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* @channel_mask: channel selection - a bit mask
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* @channels: pointer to conversion output data for the selected channels
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* @return: 0 if OK, -ve on error
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*/
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int adc_channels_single_shot(const char *name, unsigned int channel_mask,
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struct adc_channel *channels);
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/**
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* adc_vdd_value() - get the ADC device's positive reference Voltage value
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*
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* Note: Depending on bool value 'vdd_supply_is_negative' of platform data,
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* the returned uV value can be negative, and it's not an error.
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*
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* @dev: ADC device to check
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* @uV: Voltage value with polarization sign (uV)
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* @return: 0 on success or -ve on error
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*/
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int adc_vdd_value(struct udevice *dev, int *uV);
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/**
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* adc_vss_value() - get the ADC device's negative reference Voltage value
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*
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* Note: Depending on bool value 'vdd_supply_is_negative' of platform data,
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* the returned uV value can be negative, and it's not an error.
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*
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* @dev: ADC device to check
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* @uV: Voltage value with polarization sign (uV)
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* @return: 0 on success or -ve on error
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*/
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int adc_vss_value(struct udevice *dev, int *uV);
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/**
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* adc_stop() - stop operation for given ADC device.
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*
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* @dev: ADC device to stop
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* @return: 0 if OK, -ve on error
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*/
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int adc_stop(struct udevice *dev);
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#endif
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