Commit 8432eb35 authored by Ian Abbott's avatar Ian Abbott Committed by Greg Kroah-Hartman
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staging: comedi: das08: Initialize AO channels 



Initialize the AO subdevice channels to mid-range data value so they are
in a known state.  This allows us to support reading back the current
value in a later patch.

Signed-off-by: default avatarIan Abbott <abbotti@mev.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3b85aa63

drivers/staging/comedi/drivers/das08.c

+12 −0
Original line number Diff line number Diff line
@@ -391,6 +391,17 @@ static void das08_ao_set_data(struct comedi_device *dev, 
	}

}



static void das08_ao_initialize(struct comedi_device *dev,

				struct comedi_subdevice *s)

{

	int n;

	unsigned int data;



	data = s->maxdata / 2;	/* should be about 0 volts */

	for (n = 0; n < s->n_chan; n++)

		das08_ao_set_data(dev, n, data);

}



static int das08_ao_winsn(struct comedi_device *dev,

			  struct comedi_subdevice *s,

			  struct comedi_insn *insn, unsigned int *data)
@@ -665,6 +676,7 @@ int das08_common_attach(struct comedi_device *dev, unsigned long iobase) 
		s->maxdata = (1 << thisboard->ao_nbits) - 1;

		s->range_table = &range_bipolar5;

		s->insn_write = das08_ao_winsn;

		das08_ao_initialize(dev, s);

	} else {

		s->type = COMEDI_SUBD_UNUSED;

	}