diff options
| author | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2021-03-14 18:15:05 +0000 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2021-04-07 08:36:36 +0100 |
| commit | 18595e71c57a60dcc041fe6a280b05417bc38d54 (patch) | |
| tree | de40ad7ab5d0cd93bc5e257da67ca9cd26b78158 /drivers/staging/iio/cdc/ad7150.c | |
| parent | f28334febda7f06b97dad2fa61a61831e03c88d1 (diff) | |
| download | linux-18595e71c57a60dcc041fe6a280b05417bc38d54.tar.bz2 | |
staging:iio:cdc:ad7150: Add scale and offset to info_mask_shared_by_type
The datasheet provides these two values on the assumption they are applied
to unshift raw value. Hence shift both the offset and scale by 4
to compensate.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20210314181511.531414-19-jic23@kernel.org
Diffstat (limited to 'drivers/staging/iio/cdc/ad7150.c')
| -rw-r--r-- | drivers/staging/iio/cdc/ad7150.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/staging/iio/cdc/ad7150.c b/drivers/staging/iio/cdc/ad7150.c index 5abc4e9958d1..c7d242f8da52 100644 --- a/drivers/staging/iio/cdc/ad7150.c +++ b/drivers/staging/iio/cdc/ad7150.c @@ -122,6 +122,18 @@ static int ad7150_read_raw(struct iio_dev *indio_dev, *val = ret; return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + /* + * Base units for capacitance are nano farads and the value + * calculated from the datasheet formula is in picofarad + * so multiply by 1000 + */ + *val = 1000; + *val2 = 40944 >> 4; /* To match shift in _RAW */ + return IIO_VAL_FRACTIONAL; + case IIO_CHAN_INFO_OFFSET: + *val = -(12288 >> 4); /* To match shift in _RAW */ + return IIO_VAL_INT; case IIO_CHAN_INFO_SAMP_FREQ: /* Strangely same for both 1 and 2 chan parts */ *val = 100; @@ -425,6 +437,8 @@ static const struct iio_event_spec ad7150_events[] = { .channel = _chan, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ BIT(IIO_CHAN_INFO_AVERAGE_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_OFFSET), \ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),\ .event_spec = ad7150_events, \ .num_event_specs = ARRAY_SIZE(ad7150_events), \ @@ -436,6 +450,8 @@ static const struct iio_event_spec ad7150_events[] = { .channel = _chan, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ BIT(IIO_CHAN_INFO_AVERAGE_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_OFFSET), \ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),\ } |