Use the comedi_subdevice 'readback' member and the core provided (*insn_read)
to handle the readback of the analog output subdevice. Remove the then unused
'ao_value' member from the private data.
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/ni_labpc.h | 2 --
drivers/staging/comedi/drivers/ni_labpc_common.c | 19 +++++--------------
2 files changed, 5 insertions(+), 16 deletions(-)
diff --git a/drivers/staging/comedi/drivers/ni_labpc.h
b/drivers/staging/comedi/drivers/ni_labpc.h
index 3261e22..e6a95f9 100644
--- a/drivers/staging/comedi/drivers/ni_labpc.h
+++ b/drivers/staging/comedi/drivers/ni_labpc.h
@@ -37,8 +37,6 @@ struct labpc_boardinfo {
struct labpc_private {
/* number of data points left to be taken */
unsigned long long count;
- /* software copy of analog output values */
- unsigned int ao_value[NUM_AO_CHAN];
/* software copys of bits written to command registers */
unsigned int cmd1;
unsigned int cmd2;
diff --git a/drivers/staging/comedi/drivers/ni_labpc_common.c
b/drivers/staging/comedi/drivers/ni_labpc_common.c
index 354c33e..a6c63b5 100644
--- a/drivers/staging/comedi/drivers/ni_labpc_common.c
+++ b/drivers/staging/comedi/drivers/ni_labpc_common.c
@@ -927,7 +927,7 @@ static void labpc_ao_write(struct comedi_device *dev,
devpriv->write_byte(dev, val & 0xff, DAC_LSB_REG(chan));
devpriv->write_byte(dev, (val >> 8) & 0xff, DAC_MSB_REG(chan));
- devpriv->ao_value[chan] = val;
+ s->readback[chan] = val;
}
static int labpc_ao_insn_write(struct comedi_device *dev,
@@ -966,18 +966,6 @@ static int labpc_ao_insn_write(struct comedi_device *dev,
return 1;
}
-static int labpc_ao_insn_read(struct comedi_device *dev,
- struct comedi_subdevice *s,
- struct comedi_insn *insn,
- unsigned int *data)
-{
- struct labpc_private *devpriv = dev->private;
-
- data[0] = devpriv->ao_value[CR_CHAN(insn->chanspec)];
-
- return 1;
-}
-
/* lowlevel write to eeprom/dac */
static void labpc_serial_out(struct comedi_device *dev, unsigned int value,
unsigned int value_width)
@@ -1301,9 +1289,12 @@ int labpc_common_attach(struct comedi_device *dev,
s->n_chan = NUM_AO_CHAN;
s->maxdata = 0x0fff;
s->range_table = &range_labpc_ao;
- s->insn_read = labpc_ao_insn_read;
s->insn_write = labpc_ao_insn_write;
+ ret = comedi_alloc_subdev_readback(s);
+ if (ret)
+ return ret;
+
/* initialize analog outputs to a known value */
for (i = 0; i < s->n_chan; i++)
labpc_ao_write(dev, s, i, s->maxdata / 2);
--
2.0.3
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