From 336650c785b62c3bea7c8cf6061c933a90241f67 Mon Sep 17 00:00:00 2001
From: Renato Lui Geh <renatogeh@gmail.com>
Date: Mon, 5 Nov 2018 17:14:58 -0200
Subject: [PATCH] staging: iio: ad7780: update voltage on read
Git-commit: 336650c785b62c3bea7c8cf6061c933a90241f67
Patch-mainline: v5.0-rc1
References: bsc#1051510

The ad7780 driver previously did not read the correct device output, as
it read an outdated value set at initialization. It now updates its
voltage on read.

Signed-off-by: Renato Lui Geh <renatogeh@gmail.com>
Acked-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/staging/iio/adc/ad7780.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
index ff8e3b2d0efc..aa0521a309db 100644
--- a/drivers/staging/iio/adc/ad7780.c
+++ b/drivers/staging/iio/adc/ad7780.c
@@ -96,12 +96,16 @@ static int ad7780_read_raw(struct iio_dev *indio_dev,
 			   long m)
 {
 	struct ad7780_state *st = iio_priv(indio_dev);
+	int voltage_uv;
 
 	switch (m) {
 	case IIO_CHAN_INFO_RAW:
 		return ad_sigma_delta_single_conversion(indio_dev, chan, val);
 	case IIO_CHAN_INFO_SCALE:
-		*val = st->int_vref_mv * st->gain;
+		voltage_uv = regulator_get_voltage(st->reg);
+		if (voltage_uv < 0)
+			return voltage_uv;
+		*val = (voltage_uv / 1000) * st->gain;
 		*val2 = chan->scan_type.realbits - 1;
 		return IIO_VAL_FRACTIONAL_LOG2;
 	case IIO_CHAN_INFO_OFFSET:
-- 
2.16.4