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From: Renato Lui Geh <renatogeh@gmail.com>
To: lars@metafoo.de, Michael.Hennerich@analog.com, jic23@kernel.org,
	knaack.h@gmx.de, pmeerw@pmeerw.net, gregkh@linuxfoundation.org,
	alexandru.Ardelean@analog.com, stefan.popa@analog.com,
	giuliano.belinassi@usp.br
Cc: linux-iio@vger.kernel.org, devel@driverdev.osuosl.org,
	linux-kernel@vger.kernel.org, kernel-usp@googlegroups.com
Subject: [PATCH v2 1/2] staging: iio: ad7780: update voltage on read
Date: Thu, 25 Oct 2018 19:30:04 -0300	[thread overview]
Message-ID: <1f7b2c6ee0e18b1c43a8b27f482b08313c52d4e9.1540506298.git.renatogeh@gmail.com> (raw)
In-Reply-To: <cover.1540506298.git.renatogeh@gmail.com>

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it read an outdated value set at initialization.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>
---
 drivers/staging/iio/adc/ad7780.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
index b67412db0318..27972563bb6a 100644
--- a/drivers/staging/iio/adc/ad7780.c
+++ b/drivers/staging/iio/adc/ad7780.c
@@ -87,11 +87,15 @@ static int ad7780_read_raw(struct iio_dev *indio_dev,
 			   long m)
 {
 	struct ad7780_state *st = iio_priv(indio_dev);
+	int voltage_uv = 0;
 
 	switch (m) {
 	case IIO_CHAN_INFO_RAW:
 		return ad_sigma_delta_single_conversion(indio_dev, chan, val);
 	case IIO_CHAN_INFO_SCALE:
+		voltage_uv = regulator_get_voltage(st->reg);
+		if (voltage_uv)
+			st->int_vref_mv = voltage_uv/1000;
 		*val = st->int_vref_mv * st->gain;
 		*val2 = chan->scan_type.realbits - 1;
 		return IIO_VAL_FRACTIONAL_LOG2;
-- 
2.19.1


  reply	other threads:[~2018-10-25 22:30 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-25 22:29 [PATCH v2 0/2] staging: iio: ad7780: correct driver read Renato Lui Geh
2018-10-25 22:30 ` Renato Lui Geh [this message]
2018-10-28 15:56   ` [PATCH v2 1/2] staging: iio: ad7780: update voltage on read Jonathan Cameron
2018-10-28 16:52     ` Renato Lui Geh
2018-10-28 18:58       ` Jonathan Cameron
2018-10-25 22:30 ` [PATCH v2 2/2] staging: iio: ad7780: fix offset read value Renato Lui Geh
2018-10-28 15:58   ` Jonathan Cameron

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