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staging: comedi: pcl711: tidy up pcl711_ao_insn()

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For aesthetics, rename this function to help with greps.

Introduce a helper function to write the values to the analog
output channel registers. Modify the defines for the D/A registers
to avoid the ? : tests based on the chan number.

Only the final value written needs to be saved for read back.

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 2013-09-20 16:38:09 -07:00 committed by Greg Kroah-Hartman
parent 8509e6d8ec
commit 871b43cec9
1 changed files with 24 additions and 26 deletions
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50
drivers/staging/comedi/drivers/pcl711.c
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@ -70,13 +70,11 @@ supported.
#define PCL711_CTR2 0x02
#define PCL711_CTRCTL 0x03
#define PCL711_AD_LO 0x04
#define PCL711_DA0_LO 0x04
#define PCL711_AD_HI 0x05
#define PCL711_DA0_HI 0x05
#define PCL711_AO_LSB_REG(x) (0x04 + ((x) * 2))
#define PCL711_AO_MSB_REG(x) (0x05 + ((x) * 2))
#define PCL711_DI_LO 0x06
#define PCL711_DA1_LO 0x06
#define PCL711_DI_HI 0x07
#define PCL711_DA1_HI 0x07
#define PCL711_CLRINTR 0x08
#define PCL711_GAIN 0x09
#define PCL711_MUX 0x0a
@ -405,26 +403,30 @@ static int pcl711_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
return 0;
}
/*
analog output
*/
static int pcl711_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
static void pcl711_ao_write(struct comedi_device *dev,
unsigned int chan, unsigned int val)
{
outb(val & 0xff, dev->iobase + PCL711_AO_LSB_REG(chan));
outb((val >> 8) & 0xff, dev->iobase + PCL711_AO_MSB_REG(chan));
}
static int pcl711_ao_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
struct pcl711_private *devpriv = dev->private;
int n;
int chan = CR_CHAN(insn->chanspec);
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int val = devpriv->ao_readback[chan];
int i;
for (n = 0; n < insn->n; n++) {
outb((data[n] & 0xff),
dev->iobase + (chan ? PCL711_DA1_LO : PCL711_DA0_LO));
outb((data[n] >> 8),
dev->iobase + (chan ? PCL711_DA1_HI : PCL711_DA0_HI));
devpriv->ao_readback[chan] = data[n];
for (i = 0; i < insn->n; i++) {
val = data[i];
pcl711_ao_write(dev, chan, val);
}
devpriv->ao_readback[chan] = val;
return n;
return insn->n;
}
static int pcl711_ao_insn_read(struct comedi_device *dev,
@ -530,7 +532,7 @@ static int pcl711_attach(struct comedi_device *dev, struct comedi_devconfig *it)
s->n_chan = board->n_aochan;
s->maxdata = 0xfff;
s->range_table = &range_bipolar5;
s->insn_write = pcl711_ao_insn;
s->insn_write = pcl711_ao_insn_write;
s->insn_read = pcl711_ao_insn_read;
/* Digital Input subdevice */
@ -552,12 +554,8 @@ static int pcl711_attach(struct comedi_device *dev, struct comedi_devconfig *it)
s->insn_bits = pcl711_do_insn_bits;
/* clear DAC */
outb(0, dev->iobase + PCL711_DA0_LO);
outb(0, dev->iobase + PCL711_DA0_HI);
outb(0, dev->iobase + PCL711_DA1_LO);
outb(0, dev->iobase + PCL711_DA1_HI);
printk(KERN_INFO "\n");
pcl711_ao_write(dev, 0, 0x0);
pcl711_ao_write(dev, 1, 0x0);
return 0;
}