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staging: comedi: me4000: only set SDF_DIFF when supported

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Some of the boards supported by this driver do not have differential analog
inputs. Only set the SDF_DIFF subdev_flag when the board supports it.

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>
This commit is contained in:
H Hartley Sweeten 2015-08-05 10:44:40 -07:00 committed by Greg Kroah-Hartman
parent 14aa4789f0
commit 31bebc030f
1 changed files with 3 additions and 1 deletions
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4
drivers/staging/comedi/drivers/me4000.c
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@ -1284,7 +1284,9 @@ static int me4000_auto_attach(struct comedi_device *dev,
/* Analog Input subdevice */
s = &dev->subdevices[0];
s->type = COMEDI_SUBD_AI;
s->subdev_flags = SDF_READABLE | SDF_COMMON | SDF_GROUND | SDF_DIFF;
s->subdev_flags = SDF_READABLE | SDF_COMMON | SDF_GROUND;
if (board->ai_diff_nchan)
s->subdev_flags |= SDF_DIFF;
s->n_chan = board->ai_nchan;
s->maxdata = 0xffff;
s->len_chanlist = ME4000_AI_CHANNEL_LIST_COUNT;