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Commit bf34c226 authored by H Hartley Sweeten's avatar H Hartley Sweeten Committed by Greg Kroah-Hartman
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staging: comedi: addi_apci_3120: provide analog output 'readback' 



Use the comedi_subdevice 'readback' member and the core provided (*insn_read)
function to provide radback of the analog output channels.

Signed-off-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: default avatarIan Abbott <abbotti@mev.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6174801d

drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c

+2 −0
Original line number Diff line number Diff line
@@ -1924,6 +1924,8 @@ static int apci3120_ao_insn_write(struct comedi_device *dev, 


		outw(APCI3120_AO_MUX(chan) | APCI3120_AO_DATA(val),

		     dev->iobase + APCI3120_AO_REG(chan));



		s->readback[chan] = val;

	}



	return insn->n;

drivers/staging/comedi/drivers/addi_apci_3120.c

+5 −0
Original line number Diff line number Diff line
@@ -195,6 +195,11 @@ static int apci3120_auto_attach(struct comedi_device *dev, 
		s->maxdata = 0x3fff;

		s->range_table = &range_bipolar10;

		s->insn_write = apci3120_ao_insn_write;

		s->insn_read = comedi_readback_insn_read;



		ret = comedi_alloc_subdev_readback(s);

		if (ret)

			return ret;

	} else {

		s->type = COMEDI_SUBD_UNUSED;

	}