Use the comedi_subdevice 'readback' member and the core provided (*insn_read)
function to provide radback of the analog output channels.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c | 2 ++
drivers/staging/comedi/drivers/addi_apci_3120.c | 5 +++++
2 files changed, 7 insertions(+)
diff --git a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
index 47b1741..c093cd4 100644
--- a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
+++ b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
@@ -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;
diff --git a/drivers/staging/comedi/drivers/addi_apci_3120.c b/drivers/staging/comedi/drivers/addi_apci_3120.c
index abc85bf..5db52cd 100644
--- a/drivers/staging/comedi/drivers/addi_apci_3120.c
+++ b/drivers/staging/comedi/drivers/addi_apci_3120.c
@@ -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;
}
--
2.0.3
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