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staging: comedi: dt2801: use comedi_subdevice 'readback'

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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 <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 2014-08-25 16:04:52 -07:00 committed by Greg Kroah-Hartman
parent f88f75fe9c
commit b858206ae9
1 changed files with 10 additions and 18 deletions
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28
drivers/staging/comedi/drivers/dt2801.c
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@ -207,9 +207,7 @@ static const struct dt2801_board boardtypes[] = {
};
struct dt2801_private {
const struct comedi_lrange *dac_range_types[2];
unsigned int ao_readback[2];
};
/* These are the low-level routines:
@ -463,28 +461,18 @@ static int dt2801_ai_insn_read(struct comedi_device *dev,
return i;
}
static int dt2801_ao_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct dt2801_private *devpriv = dev->private;
data[0] = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
return 1;
}
static int dt2801_ao_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
struct comedi_insn *insn,
unsigned int *data)
{
struct dt2801_private *devpriv = dev->private;
unsigned int chan = CR_CHAN(insn->chanspec);
dt2801_writecmd(dev, DT_C_WRITE_DAIM);
dt2801_writedata(dev, CR_CHAN(insn->chanspec));
dt2801_writedata(dev, chan);
dt2801_writedata2(dev, data[0]);
devpriv->ao_readback[CR_CHAN(insn->chanspec)] = data[0];
s->readback[chan] = data[0];
return 1;
}
@ -608,8 +596,12 @@ havetype:
s->range_table_list = devpriv->dac_range_types;
devpriv->dac_range_types[0] = dac_range_lkup(it->options[4]);
devpriv->dac_range_types[1] = dac_range_lkup(it->options[5]);
s->insn_read = dt2801_ao_insn_read;
s->insn_write = dt2801_ao_insn_write;
s->insn_read = comedi_readback_insn_read;
ret = comedi_alloc_subdev_readback(s);
if (ret)
return ret;
s = &dev->subdevices[2];
/* 1st digital subdevice */