Introduce a helper function to read the a/d conversion result from the fifo.
Signed-off-by: H Hartley Sweeten <[email protected]> Cc: Ian Abbott <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> --- drivers/staging/comedi/drivers/ni_labpc.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/drivers/staging/comedi/drivers/ni_labpc.c b/drivers/staging/comedi/drivers/ni_labpc.c index 7f24450..9e47fc0 100644 --- a/drivers/staging/comedi/drivers/ni_labpc.c +++ b/drivers/staging/comedi/drivers/ni_labpc.c @@ -436,13 +436,21 @@ static void labpc_setup_cmd6_reg(struct comedi_device *dev, devpriv->write_byte(devpriv->cmd6, dev->iobase + COMMAND6_REG); } -static void labpc_clear_adc_fifo(const struct comedi_device *dev) +static unsigned int labpc_read_adc_fifo(struct comedi_device *dev) +{ + struct labpc_private *devpriv = dev->private; + unsigned int lsb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG); + unsigned int msb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG); + + return (msb << 8) | lsb; +} + +static void labpc_clear_adc_fifo(struct comedi_device *dev) { struct labpc_private *devpriv = dev->private; devpriv->write_byte(0x1, dev->iobase + ADC_CLEAR_REG); - devpriv->read_byte(dev->iobase + ADC_FIFO_REG); - devpriv->read_byte(dev->iobase + ADC_FIFO_REG); + labpc_read_adc_fifo(dev); } static int labpc_ai_insn_read(struct comedi_device *dev, @@ -455,7 +463,6 @@ static int labpc_ai_insn_read(struct comedi_device *dev, unsigned int range = CR_RANGE(insn->chanspec); unsigned int aref = CR_AREF(insn->chanspec); int timeout = 1000; - int lsb, msb; int i, n; /* disable timed conversions, interrupt generation and dma */ @@ -496,9 +503,7 @@ static int labpc_ai_insn_read(struct comedi_device *dev, comedi_error(dev, "timeout"); return -ETIME; } - lsb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG); - msb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG); - data[n] = (msb << 8) | lsb; + data[n] = labpc_read_adc_fifo(dev); } return n; @@ -1185,7 +1190,6 @@ static void handle_isa_dma(struct comedi_device *dev) static int labpc_drain_fifo(struct comedi_device *dev) { struct labpc_private *devpriv = dev->private; - unsigned int lsb, msb; short data; struct comedi_async *async = dev->read_subdev->async; const int timeout = 10000; @@ -1201,9 +1205,7 @@ static int labpc_drain_fifo(struct comedi_device *dev) break; devpriv->count--; } - lsb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG); - msb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG); - data = (msb << 8) | lsb; + data = labpc_read_adc_fifo(dev); cfc_write_to_buffer(dev->read_subdev, data); devpriv->stat1 = devpriv->read_byte(dev->iobase + STATUS1_REG); } -- 1.8.1.4 _______________________________________________ devel mailing list [email protected] http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
