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Commit 49162116 authored by H Hartley Sweeten's avatar H Hartley Sweeten Committed by Greg Kroah-Hartman
Browse files

staging: comedi: core: introduce comedi_chan_range_is_{bi,uni}polar() 



Introduce two helper functions to check if a subdevice range_table_list
for a given channel/range is bipolar or unipolar.

Signed-off-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: default avatarIan Abbott <abbotti@mev.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5cb404d9

drivers/staging/comedi/comedidev.h

+14 −0
Original line number Diff line number Diff line
@@ -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)