staging:iio: filter description - low pass 3db frequency.

Introduce the first data filtering related parameter.
For now we are ignoring the filter type and merely specifying its
approximate (I read them off tiny graphs) 3db point.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/iio/iio.h b/drivers/staging/iio/iio.h
index 66c2604c92c4e080c54377863162d2a0e89fc6cb..4aed915e90608f21666b03651590660d1f13d436 100644 (file)
--- a/drivers/staging/iio/iio.h
+++ b/drivers/staging/iio/iio.h
@@ -35,6 +35,7 @@ enum iio_chan_info_enum {
        IIO_CHAN_INFO_PEAK_SCALE,
        IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW,
        IIO_CHAN_INFO_AVERAGE_RAW,
+       IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY,
 };
 
 #define IIO_CHAN_INFO_SHARED_BIT(type) BIT(type*2)
@@ -74,6 +75,12 @@ enum iio_chan_info_enum {
        IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_AVERAGE_RAW)
 #define IIO_CHAN_INFO_AVERAGE_RAW_SHARED_BIT                   \
        IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_AVERAGE_RAW)
+#define IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT \
+       IIO_CHAN_INFO_SHARED_BIT(                              \
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY)
+#define IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SEPARATE_BIT \
+       IIO_CHAN_INFO_SEPARATE_BIT(                            \
+               IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY)
 
 enum iio_endian {
        IIO_CPU,

diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c
index 0b671663b55d2b9d1c9d07fc566f530f9edbef13..55c0b4880f8eea5507d0af6fed84ddf6676ef159 100644 (file)
--- a/drivers/staging/iio/industrialio-core.c
+++ b/drivers/staging/iio/industrialio-core.c
@@ -85,6 +85,8 @@ static const char * const iio_chan_info_postfix[] = {
        [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
        [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
        [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
+       [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
+       = "filter_low_pass_3db_frequency",
 };
 
 /**