lkml.org 
[lkml]   [2019]   [Jun]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v1 2/3] iio: afe: rescale: Add support of CHAN_INFO_PROCESSED
Date
Add the support of the CHAN_INFO_PROCESSED to have directly
the processed value (raw * scale). It will be exported as
in_voltage0_input in sysfs.

Signed-off-by: Mylène Josserand <mylene.josserand@bootlin.com>
---
drivers/iio/afe/iio-rescale.c | 42 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
index 3e689d6eb501..2275571fff64 100644
--- a/drivers/iio/afe/iio-rescale.c
+++ b/drivers/iio/afe/iio-rescale.c
@@ -63,14 +63,54 @@ static int rescale_convert_scale(struct rescale *rescale, int *val, int *val2)
}
}

+static int rescale_convert_processed(struct rescale *rescale, int raw,
+ int *val, int *val2)
+{
+ unsigned long long tmp, scaled;
+ int ret;
+
+ ret = rescale_convert_scale(rescale, val, val2);
+ switch (ret) {
+ case IIO_VAL_FRACTIONAL:
+ tmp = div_s64((s64)*val * 1000000000LL, *val2);
+ scaled = tmp * raw;
+ *val = (int)div_s64_rem(scaled, 1000000000, val2);
+ return ret;
+ case IIO_VAL_INT:
+ return IIO_VAL_FRACTIONAL;
+ case IIO_VAL_FRACTIONAL_LOG2:
+ tmp = shift_right((s64)*val * 1000000000LL, *val2);
+ scaled = tmp * raw;
+ *val = (int)div_s64_rem(scaled, 1000000000LL, val2);
+ return ret;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
static int rescale_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct rescale *rescale = iio_priv(indio_dev);
+ unsigned int raw;
int ret;

switch (mask) {
+ case IIO_CHAN_INFO_PROCESSED:
+ /* Read the raw value and the scale */
+ ret = iio_read_channel_raw(rescale->source, &raw);
+ if (!ret)
+ return ret;
+ ret = iio_read_channel_scale(rescale->source, val, val2);
+ if (!ret)
+ return ret;
+ /* Process the correct value with raw * scale */
+ ret = rescale_convert_processed(rescale, raw, val, val2);
+ if (!ret)
+ return ret;
+ return IIO_VAL_INT;
+
case IIO_CHAN_INFO_RAW:
return iio_read_channel_raw(rescale->source, val);

@@ -145,7 +185,7 @@ static int rescale_configure_channel(struct device *dev,
}

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

if (iio_channel_has_available(schan, IIO_CHAN_INFO_RAW))
chan->info_mask_separate_available |= BIT(IIO_CHAN_INFO_RAW);
--
2.11.0
\
 
 \ /
  Last update: 2019-06-11 11:58    [W:0.131 / U:0.124 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site