linux-kernel - [PATCH] iio: adc: Add scaling support to exynos adc driver

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Message-ID: <BN6PR04MB066058A68D6471E7F6AFCFF7A3A20@BN6PR04MB0660.namprd04.prod.outlook.com>
Date:   Fri,  8 May 2020 14:14:00 -0700
From:   Jonathan Bakker <xc-racer2@...e.ca>
To:     jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, kgene@...nel.org, krzk@...nel.org
Cc:     cw00.choi@...sung.com, kstewart@...uxfoundation.org,
        mpe@...erman.id.au, m.szyprowski@...sung.com, swboyd@...omium.org,
        tglx@...utronix.de, linux-iio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jonathan Bakker <xc-racer2@...e.ca>
Subject: [PATCH] iio: adc: Add scaling support to exynos adc driver

Currently the driver only exposes the raw counts.  As we
have the regulator voltage and the maximum value (stored in
the data mask), we can trivially produce a scaling fraction
of voltage / max value.

This assumes that the regulator voltage is in fact the max
voltage, which appears to be the case for all mainline dts
and cross referenced with the public Exynos4412 and S5PV210
datasheets.

Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
---
 drivers/iio/adc/exynos_adc.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
index 22131a677445..9d29b56805cd 100644
--- a/drivers/iio/adc/exynos_adc.c
+++ b/drivers/iio/adc/exynos_adc.c
@@ -531,8 +531,19 @@ static int exynos_read_raw(struct iio_dev *indio_dev,
 	unsigned long timeout;
 	int ret;
 
-	if (mask != IIO_CHAN_INFO_RAW)
+	if (mask == IIO_CHAN_INFO_SCALE) {
+		ret = regulator_get_voltage(info->vdd);
+		if (ret < 0)
+			return ret;
+
+		/* Regulator voltage is in uV, but need mV */
+		*val = ret / 1000;
+		*val2 = info->data->mask;
+
+		return IIO_VAL_FRACTIONAL;
+	} else if (mask != IIO_CHAN_INFO_RAW) {
 		return -EINVAL;
+	}
 
 	mutex_lock(&indio_dev->mlock);
 	reinit_completion(&info->completion);
@@ -683,6 +694,7 @@ static const struct iio_info exynos_adc_iio_info = {
 	.channel = _index,				\
 	.address = _index,				\
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
+	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SCALE),	\
 	.datasheet_name = _id,				\
 }
 
-- 
2.20.1