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staging: comedi: ni_labpc_common: use subdevice readback for analog outputs

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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 <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2014-11-20 15:07:34 -07:00 committed by Greg Kroah-Hartman
parent 8e06519b27
commit c82f0e6b36
2 changed files with 5 additions and 16 deletions
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2
drivers/staging/comedi/drivers/ni_labpc.h
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@ -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;

19
drivers/staging/comedi/drivers/ni_labpc_common.c
View file

@ -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);