Introduce some helper functions to check if a given 'range' index
to a comedi_subdevice 'range_table' is a bipolar or unipolar range.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/comedidev.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h
index ab926a6..57deabf 100644
--- a/drivers/staging/comedi/comedidev.h
+++ b/drivers/staging/comedi/comedidev.h
@@ -307,6 +307,18 @@ struct comedi_lrange {
struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
};
+static inline bool comedi_range_is_bipolar(struct comedi_subdevice *s,
+ unsigned int range)
+{
+ return s->range_table->range[range].min < 0;
+}
+
+static inline bool comedi_range_is_unipolar(struct comedi_subdevice *s,
+ unsigned int range)
+{
+ return s->range_table->range[range].min >= 0;
+}
+
/* some silly little inline functions */
static inline unsigned int bytes_per_sample(const struct comedi_subdevice *subd)
--
1.8.1.4
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