diff options
| -rw-r--r-- | drivers/staging/comedi/drivers/cb_pcidas.c | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/drivers/staging/comedi/drivers/cb_pcidas.c b/drivers/staging/comedi/drivers/cb_pcidas.c index 1479325ab7ea..3ba75afe4e05 100644 --- a/drivers/staging/comedi/drivers/cb_pcidas.c +++ b/drivers/staging/comedi/drivers/cb_pcidas.c @@ -662,23 +662,25 @@ static int caldac_read_insn(struct comedi_device *dev, static int dac08_write(struct comedi_device *dev, unsigned int value) { struct cb_pcidas_private *devpriv = dev->private; + unsigned long cal_reg; - if (devpriv->dac08_value == value) - return 1; + if (devpriv->dac08_value != value) { + devpriv->dac08_value = value; - devpriv->dac08_value = value; + cal_reg = devpriv->control_status + CALIBRATION_REG; - outw(cal_enable_bits(dev) | (value & 0xff), - devpriv->control_status + CALIBRATION_REG); - udelay(1); - outw(cal_enable_bits(dev) | SELECT_DAC08_BIT | (value & 0xff), - devpriv->control_status + CALIBRATION_REG); - udelay(1); - outw(cal_enable_bits(dev) | (value & 0xff), - devpriv->control_status + CALIBRATION_REG); - udelay(1); + value &= 0xff; + value |= cal_enable_bits(dev); - return 1; + /* latch the new value into the caldac */ + outw(value, cal_reg); + udelay(1); + outw(value | SELECT_DAC08_BIT, cal_reg); + udelay(1); + outw(value, cal_reg); + udelay(1); + } + return 1; /* insn->n */ } static int dac08_write_insn(struct comedi_device *dev, |