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Subject[PATCH v2 6/8] iio: afe: rescale: add offset support
Date
From: Liam Beguin <lvb@xiphos.com>

This is a preparatory change required for the addition of temperature
sensing front ends.

Signed-off-by: Liam Beguin <lvb@xiphos.com>
---
drivers/iio/afe/iio-rescale.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
index e34148d39b39..3d445c76dbb2 100644
--- a/drivers/iio/afe/iio-rescale.c
+++ b/drivers/iio/afe/iio-rescale.c
@@ -32,6 +32,7 @@ struct rescale {
bool chan_processed;
s32 numerator;
s32 denominator;
+ s32 offset;
};

static int rescale_read_raw(struct iio_dev *indio_dev,
@@ -86,6 +87,10 @@ static int rescale_read_raw(struct iio_dev *indio_dev,
default:
return -EOPNOTSUPP;
}
+ case IIO_CHAN_INFO_OFFSET:
+ *val = rescale->offset;
+
+ return IIO_VAL_INT;
default:
return -EINVAL;
}
@@ -165,6 +170,9 @@ static int rescale_configure_channel(struct device *dev,
chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE);

+ if (rescale->offset)
+ chan->info_mask_separate |= BIT(IIO_CHAN_INFO_OFFSET);
+
/*
* Using .read_avail() is fringe to begin with and makes no sense
* whatsoever for processed channels, so we make sure that this cannot
@@ -329,6 +337,7 @@ static int rescale_probe(struct platform_device *pdev)
rescale->cfg = of_device_get_match_data(dev);
rescale->numerator = 1;
rescale->denominator = 1;
+ rescale->offset = 0;

ret = rescale->cfg->props(dev, rescale);
if (ret)
--
2.30.1.489.g328c10930387
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