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staging: comedi: comedidev.h: document struct comedi_lrange 

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2015-09-21 18:52:53 +01:00 committed by Greg Kroah-Hartman
parent 11a10830b6
commit 5459bc1281
1 changed files with 11 additions and 0 deletions
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11
drivers/staging/comedi/comedidev.h
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@ -606,6 +606,17 @@ extern const struct comedi_lrange range_unknown;
#define GCC_ZERO_LENGTH_ARRAY 0 #define GCC_ZERO_LENGTH_ARRAY 0
#endif #endif
/**
* struct comedi_lrange - Describes a COMEDI range table
* @length: Number of entries in the range table.
* @range: Array of &struct comedi_krange, one for each range.
*
* Each element of @range[] describes the minimum and maximum physical range
* range and the type of units. Typically, the type of unit is %UNIT_volt
* (i.e. volts) and the minimum and maximum are in millionths of a volt.
* There may also be a flag that indicates the minimum and maximum are merely
* scale factors for an unknown, external reference.
*/
struct comedi_lrange { struct comedi_lrange {
int length; int length;
struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY]; struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY];