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/rtd520.c | 26 ++++++--------------------
1 file changed, 6 insertions(+), 20 deletions(-)
diff --git a/drivers/staging/comedi/drivers/rtd520.c
b/drivers/staging/comedi/drivers/rtd520.c
index 6fc4ed3..7c7911b 100644
--- a/drivers/staging/comedi/drivers/rtd520.c
+++ b/drivers/staging/comedi/drivers/rtd520.c
@@ -380,7 +380,6 @@ struct rtd_private {
int xfer_count; /* # to transfer data. 0->1/2FIFO */
int flags; /* flag event modes */
DECLARE_BITMAP(chan_is_bipolar, RTD_MAX_CHANLIST);
- unsigned int ao_readback[2];
unsigned fifosz;
};
@@ -1138,7 +1137,7 @@ static int rtd_ao_winsn(struct comedi_device *dev,
((chan == 0) ? LAS1_DAC1_FIFO : LAS1_DAC2_FIFO));
writew(0, dev->mmio + ((chan == 0) ? LAS0_DAC1 : LAS0_DAC2));
- devpriv->ao_readback[chan] = data[i];
+ s->readback[chan] = data[i];
ret = comedi_timeout(dev, s, insn, rtd_ao_eoc, 0);
if (ret)
@@ -1149,23 +1148,6 @@ static int rtd_ao_winsn(struct comedi_device *dev,
return i;
}
-/* AO subdevices should have a read insn as well as a write insn.
- * Usually this means copying a value stored in devpriv. */
-static int rtd_ao_rinsn(struct comedi_device *dev,
- struct comedi_subdevice *s, struct comedi_insn *insn,
- unsigned int *data)
-{
- struct rtd_private *devpriv = dev->private;
- int i;
- int chan = CR_CHAN(insn->chanspec);
-
- for (i = 0; i < insn->n; i++)
- data[i] = devpriv->ao_readback[chan];
-
-
- return i;
-}
-
static int rtd_dio_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
@@ -1323,7 +1305,11 @@ static int rtd_auto_attach(struct comedi_device *dev,
s->maxdata = 0x0fff;
s->range_table = &rtd_ao_range;
s->insn_write = rtd_ao_winsn;
- s->insn_read = rtd_ao_rinsn;
+ s->insn_read = comedi_readback_insn_read;
+
+ ret = comedi_alloc_subdev_readback(s);
+ if (ret)
+ return ret;
s = &dev->subdevices[2];
/* digital i/o subdevice */
--
2.0.3
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