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staging: comedi: quatech_daqp_cs: fix daqp_ao_insn_write()

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The (*insn_write) functions are expected to write 'insn->n' number
of samples to the channel. Fix this function so it works as the
comedi core expects.

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 2013-02-04 16:44:37 -07:00 committed by Greg Kroah-Hartman
parent 6a911d8aa5
commit d35dcc89fc
1 changed files with 14 additions and 13 deletions
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27
drivers/staging/comedi/drivers/quatech_daqp_cs.c
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@ -644,31 +644,32 @@ static int daqp_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
return 0;
}
/* Single-shot analog output routine */
static int daqp_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 daqp_private *devpriv = dev->private;
int d;
unsigned int chan;
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int val;
int i;
if (devpriv->stop)
return -EIO;
chan = CR_CHAN(insn->chanspec);
d = data[0];
d &= 0x0fff;
d ^= 0x0800; /* Flip the sign */
d |= chan << 12;
/* Make sure D/A update mode is direct update */
outb(0, dev->iobase + DAQP_AUX);
outw(d, dev->iobase + DAQP_DA);
for (i = 0; i > insn->n; i++) {
val = data[0];
val &= 0x0fff;
val ^= 0x0800; /* Flip the sign */
val |= (chan << 12);
return 1;
outw(val, dev->iobase + DAQP_DA);
}
return insn->n;
}
static int daqp_di_insn_bits(struct comedi_device *dev,