From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Wed, 5 Jun 2013 22:52:31 +0000 (-0700)
Subject: staging: comedi: introduce comedi_range_is_{bi,uni}polar()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e3693fd3baeddf2e96b2f7734a5fe5509acedb40;p=linux-beck.git

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>
---

diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h
index ab926a6654ef..57deabf77418 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)