From 3f57e39e3c69476513c00cd5ec45703f58334972 Mon Sep 17 00:00:00 2001
From: Fabien Proriol <fabien.proriol@xxxxxxxx>
Date: Tue, 4 Nov 2014 17:05:59 +0100
Subject: [PATCH] xilinx-xadc-core: Fix voltage offset
When xilinx-xadc is used with hwmon driver to read voltage, offset used
for temperature is always apply.
This patch change the return for IIO_CHAN_INFO_OFFSET to -EINVAL except
for temperature to avoid offset.
Signed-off-by: Fabien Proriol <fabien.proriol@xxxxxxxx>
---
drivers/iio/adc/xilinx-xadc-core.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/iio/adc/xilinx-xadc-core.c
b/drivers/iio/adc/xilinx-xadc-core.c
index 41d3a5e..6064d26 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -877,9 +877,14 @@ static int xadc_read_raw(struct iio_dev *indio_dev,
return -EINVAL;
}
case IIO_CHAN_INFO_OFFSET:
- /* Only the temperature channel has an offset */
- *val = -((273150 << 12) / 503975);
- return IIO_VAL_INT;
+ switch (chan->type) {
+ case IIO_TEMP:
+ /* Only the temperature channel has an offset */
+ *val = -((273150 << 12) / 503975);
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
case IIO_CHAN_INFO_SAMP_FREQ:
ret = xadc_read_adc_reg(xadc, XADC_REG_CONF2, &val16);
if (ret)
--
2.0.4
--
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