[PATCH v1 4/9] iio: afe: rescale: add offset support

Liam Beguin
2021-05-30T00:59:46Z

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 | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
index 4d0813b274d1..3bd1f11f21db 100644
--- a/drivers/iio/afe/iio-rescale.c
+++ b/drivers/iio/afe/iio-rescale.c
@@ -31,6 +31,7 @@ struct rescale {
struct iio_chan_spec_ext_info *ext_info;
s32 numerator;
s32 denominator;
+ s32 offset;
};

static int rescale_read_raw(struct iio_dev *indio_dev,
@@ -52,6 +53,10 @@ static int rescale_read_raw(struct iio_dev *indio_dev,
*val2 = rescale->denominator;

return IIO_VAL_FRACTIONAL;
+ case IIO_CHAN_INFO_OFFSET:
+ *val = rescale->offset;
+
+ return IIO_VAL_INT;
default:
return -EINVAL;
}
@@ -119,8 +124,10 @@ static int rescale_configure_channel(struct device *dev,
return -EINVAL;
}

- chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
- BIT(IIO_CHAN_INFO_SCALE);
+ chan->info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_OFFSET);

if (iio_channel_has_available(schan, IIO_CHAN_INFO_RAW))
chan->info_mask_separate_available |= BIT(IIO_CHAN_INFO_RAW);
@@ -280,6 +287,7 @@ 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