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iio: adc: spmi-vadc: Update function for generic voltage conversion

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Several channels are supported in ADC of PMIC which can be used to
measure voltage, temperature, current etc., Hardware provides
readings for all channels in adc code. That adc code needs to be
converted to voltage. Logic for conversion of adc code to voltage
is common for all ADC channels(voltage, temperature, current
.,etc). Implement separate function for generic conversion logic.

Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Rama Krishna Phani A 2016-12-09 20:31:49 +05:30 committed by Jonathan Cameron
parent 29e90cd79f
commit ba71704af4
1 changed files with 29 additions and 25 deletions
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54
drivers/iio/adc/qcom-spmi-vadc.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
* Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@ -468,27 +468,38 @@ err:
return ret;
}
static s32 vadc_calibrate(struct vadc_priv *vadc,
const struct vadc_channel_prop *prop, u16 adc_code)
static void vadc_scale_calib(struct vadc_priv *vadc, u16 adc_code,
const struct vadc_channel_prop *prop,
s64 *scale_voltage)
{
*scale_voltage = (adc_code -
vadc->graph[prop->calibration].gnd);
*scale_voltage *= vadc->graph[prop->calibration].dx;
*scale_voltage = div64_s64(*scale_voltage,
vadc->graph[prop->calibration].dy);
if (prop->calibration == VADC_CALIB_ABSOLUTE)
*scale_voltage +=
vadc->graph[prop->calibration].dx;
if (*scale_voltage < 0)
*scale_voltage = 0;
}
static int vadc_scale_volt(struct vadc_priv *vadc,
const struct vadc_channel_prop *prop, u16 adc_code,
int *result_uv)
{
const struct vadc_prescale_ratio *prescale;
s64 voltage;
s64 voltage = 0, result = 0;
voltage = adc_code - vadc->graph[prop->calibration].gnd;
voltage *= vadc->graph[prop->calibration].dx;
voltage = div64_s64(voltage, vadc->graph[prop->calibration].dy);
if (prop->calibration == VADC_CALIB_ABSOLUTE)
voltage += vadc->graph[prop->calibration].dx;
if (voltage < 0)
voltage = 0;
vadc_scale_calib(vadc, adc_code, prop, &voltage);
prescale = &vadc_prescale_ratios[prop->prescale];
voltage = voltage * prescale->den;
result = div64_s64(voltage, prescale->num);
*result_uv = result;
return div64_s64(voltage, prescale->num);
return 0;
}
static int vadc_decimation_from_dt(u32 value)
@ -552,11 +563,8 @@ static int vadc_read_raw(struct iio_dev *indio_dev,
if (ret)
break;
*val = vadc_calibrate(vadc, prop, adc_code);
vadc_scale_volt(vadc, prop, adc_code, val);
/* 2mV/K, return milli Celsius */
*val /= 2;
*val -= KELVINMIL_CELSIUSMIL;
return IIO_VAL_INT;
case IIO_CHAN_INFO_RAW:
prop = &vadc->chan_props[chan->address];
@ -564,12 +572,8 @@ static int vadc_read_raw(struct iio_dev *indio_dev,
if (ret)
break;
*val = vadc_calibrate(vadc, prop, adc_code);
*val = (int)adc_code;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = 0;
*val2 = 1000;
return IIO_VAL_INT_PLUS_MICRO;
default:
ret = -EINVAL;
break;
@ -617,7 +621,7 @@ struct vadc_channels {
#define VADC_CHAN_VOLT(_dname, _pre) \
VADC_CHAN(_dname, IIO_VOLTAGE, \
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), \
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),\
_pre) \
/*