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

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@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2013-06-05 15:52:31 -07:00 committed by Greg Kroah-Hartman
parent 9a8e7f63dc
commit e3693fd3ba
1 changed files with 12 additions and 0 deletions
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12
drivers/staging/comedi/comedidev.h
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@ -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)