Use the new comedi_subdevice 'readback' member and the core provided
(*insn_read) for the readback of the analog output subdevice channels.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/addi_apci_3xxx.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/comedi/drivers/addi_apci_3xxx.c
b/drivers/staging/comedi/drivers/addi_apci_3xxx.c
index 0f0c7fa..1f59f16 100644
--- a/drivers/staging/comedi/drivers/addi_apci_3xxx.c
+++ b/drivers/staging/comedi/drivers/addi_apci_3xxx.c
@@ -628,16 +628,20 @@ static int apci3xxx_ao_insn_write(struct comedi_device
*dev,
int i;
for (i = 0; i < insn->n; i++) {
+ unsigned int val = data[i];
+
/* Set the range selection */
writel(range, dev->mmio + 96);
/* Write the analog value to the selected channel */
- writel((data[i] << 8) | chan, dev->mmio + 100);
+ writel((val << 8) | chan, dev->mmio + 100);
/* Wait the end of transfer */
ret = comedi_timeout(dev, s, insn, apci3xxx_ao_eoc, 0);
if (ret)
return ret;
+
+ s->readback[chan] = val;
}
return insn->n;
@@ -850,6 +854,11 @@ static int apci3xxx_auto_attach(struct comedi_device *dev,
s->maxdata = 0x0fff;
s->range_table = &apci3xxx_ao_range;
s->insn_write = apci3xxx_ao_insn_write;
+ s->insn_read = comedi_readback_insn_read;
+
+ ret = comedi_alloc_subdev_readback(s);
+ if (ret)
+ return ret;
subdev++;
}
--
2.0.3
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