staging: comedi: comedidev.h: introduce some 'range_is_external' helpers

The comedi_krange includes a flags member that currently identifies the
'units' of the range (RF_UNIT) and if the range is from an internal or
external source (RF_EXTERNAL).

Introduce some helper functions to check if a given range is from an
external source.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: 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 0167945..a7f24a9 100644 (file)
--- a/drivers/staging/comedi/comedidev.h
+++ b/drivers/staging/comedi/comedidev.h
@@ -363,6 +363,12 @@ static inline bool comedi_range_is_unipolar(struct comedi_subdevice *s,
        return s->range_table->range[range].min >= 0;
 }
 
+static inline bool comedi_range_is_external(struct comedi_subdevice *s,
+                                           unsigned int range)
+{
+       return !!(s->range_table->range[range].flags & RF_EXTERNAL);
+}
+
 static inline bool comedi_chan_range_is_bipolar(struct comedi_subdevice *s,
                                                unsigned int chan,
                                                unsigned int range)
@@ -377,6 +383,13 @@ static inline bool comedi_chan_range_is_unipolar(struct comedi_subdevice *s,
        return s->range_table_list[chan]->range[range].min >= 0;
 }
 
+static inline bool comedi_chan_range_is_external(struct comedi_subdevice *s,
+                                                unsigned int chan,
+                                                unsigned int range)
+{
+       return !!(s->range_table_list[chan]->range[range].flags & RF_EXTERNAL);
+}
+
 /* munge between offset binary and two's complement values */
 static inline unsigned int comedi_offset_munge(struct comedi_subdevice *s,
                                               unsigned int val)