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staging: comedi: pcmad: tidy up pcmad_ai_insn_read()

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Use a local variable to read and munge the analog input data instead
of directly using the 'data' pointer passed to the function.

(*insn_read) functions either return an errno or the number of data
values read. Change the final return to insn->n to make this clearer.

Tidy up the function.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2013-06-05 15:37:06 -07:00 committed by Greg Kroah-Hartman
parent a0e82af4c5
commit 3275b4d3db
1 changed files with 12 additions and 10 deletions
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22
drivers/staging/comedi/drivers/pcmad.c
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@ -86,30 +86,32 @@ static int pcmad_ai_wait_for_eoc(struct comedi_device *dev,
static int pcmad_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
struct comedi_insn *insn,
unsigned int *data)
{
struct pcmad_priv_struct *devpriv = dev->private;
int chan;
int n;
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int val;
int ret;
int i;
chan = CR_CHAN(insn->chanspec);
for (n = 0; n < insn->n; n++) {
for (i = 0; i < insn->n; i++) {
outb(chan, dev->iobase + PCMAD_CONVERT);
ret = pcmad_ai_wait_for_eoc(dev, TIMEOUT);
if (ret)
return ret;
data[n] = inb(dev->iobase + PCMAD_LSB);
data[n] |= (inb(dev->iobase + PCMAD_MSB) << 8);
val = inb(dev->iobase + PCMAD_LSB) |
(inb(dev->iobase + PCMAD_MSB) << 8);
if (devpriv->twos_comp)
data[n] ^= ((s->maxdata + 1) >> 1);
val ^= ((s->maxdata + 1) >> 1);
data[i] = val;
}
return n;
return insn->n;
}
/*