Introduce two helper functions to check if a subdevice range_table_list
for a given channel/range is bipolar or unipolar.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/comedidev.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/staging/comedi/comedidev.h
b/drivers/staging/comedi/comedidev.h
index bec2276..6db099b 100644
--- a/drivers/staging/comedi/comedidev.h
+++ b/drivers/staging/comedi/comedidev.h
@@ -307,6 +307,20 @@ static inline bool comedi_range_is_unipolar(struct
comedi_subdevice *s,
return s->range_table->range[range].min >= 0;
}
+static inline bool comedi_chan_range_is_bipolar(struct comedi_subdevice *s,
+ unsigned int chan,
+ unsigned int range)
+{
+ return s->range_table_list[chan]->range[range].min < 0;
+}
+
+static inline bool comedi_chan_range_is_unipolar(struct comedi_subdevice *s,
+ unsigned int chan,
+ unsigned int range)
+{
+ return s->range_table_list[chan]->range[range].min >= 0;
+}
+
/* munge between offset binary and two's complement values */
static inline unsigned int comedi_offset_munge(struct comedi_subdevice *s,
unsigned int val)
--
1.8.3.2
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