33 lines
1.1 KiB
Diff
33 lines
1.1 KiB
Diff
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From 0d1d6858945e92f61409039ea7f6dd88b562e9ef Mon Sep 17 00:00:00 2001
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From: Vasily Khoruzhick <anarsoul@gmail.com>
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Date: Tue, 24 Apr 2018 22:21:10 -0700
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Subject: [PATCH 024/153] drv:iio:sun4i-gpadc-iio: don`t force poweroff
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ignore zero samples to avoid force poweroff when reading first sample
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Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
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---
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drivers/iio/adc/sun4i-gpadc-iio.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
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index 2889a7078..ead5d9f4d 100644
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--- a/drivers/iio/adc/sun4i-gpadc-iio.c
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+++ b/drivers/iio/adc/sun4i-gpadc-iio.c
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@@ -716,6 +716,12 @@ static int sun4i_gpadc_get_temp(struct thermal_zone_device *tz, int *temp)
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if (sun4i_gpadc_temp_read(info->indio_dev, &val, info->sensor_id))
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return -ETIMEDOUT;
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+ /* Ignore first sample which is always zero. 0 is either too
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+ * cold or too hot, so we can safely ignore it
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+ */
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+ if (val == 0)
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+ return -ETIMEDOUT;
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+
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sun4i_gpadc_temp_scale(info->indio_dev, &scale);
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sun4i_gpadc_temp_offset(info->indio_dev, &offset);
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--
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2.35.3
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