linux-kernel - [PATCH 4.0 039/148] iio: adc: xilinx: Fix VREFN sign

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Message-Id: <20150603114207.051594458@linuxfoundation.org>
Date:	Wed,  3 Jun 2015 21:08:29 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Thomas Betker <thomas.betker@...de-schwarz.com>,
	Jonathan Cameron <jic23@...nel.org>
Subject: [PATCH 4.0 039/148] iio: adc: xilinx: Fix VREFN sign

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Betker <thomas.betker@...de-schwarz.com>

commit 97ffae1d30c3f6ceee67d5b0d3e540c08c13c744 upstream.

The VREFN channel is bipolar, not unipolar. Small negative values do
occur (e.g., -1mV), and unsigned conversion maps them incorrectly to
large positive values (about +1V), so fix this.

Signed-off-by: Thomas Betker <thomas.betker@...de-schwarz.com>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iio/adc/xilinx-xadc-core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -997,7 +997,7 @@ static const struct iio_event_spec xadc_
 	.num_event_specs = (_alarm) ? ARRAY_SIZE(xadc_voltage_events) : 0, \
 	.scan_index = (_scan_index), \
 	.scan_type = { \
-		.sign = 'u', \
+		.sign = ((_addr) == XADC_REG_VREFN) ? 's' : 'u', \
 		.realbits = 12, \
 		.storagebits = 16, \
 		.shift = 4, \


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