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it read an outdated value set at initialization.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
next prev parent 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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