diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2016-05-04 12:47:18 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-06-17 20:44:04 -0700 |
| commit | 7c9574090d30609df66d5c39139c82e6b6e98f9c (patch) | |
| tree | 7199630f130734565d5629b6100c74134852a3a8 /drivers/staging/comedi/drivers/dt2811.c | |
| parent | dedfdf9009fde19dbb1e1da9cc42c6dab6795135 (diff) | |
staging: comedi: dt2811: simplify A/D reference configuration
The analog inputs are confgured with jumpers on the board to be:
* 16 single-ended inputs
* 8 differential inputs
* 16 pseudo-differential inputs (common ground)
Simplify the handling of this configuration option and properly set
the subdev_flags based on the selected input mode.
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>
Diffstat (limited to 'drivers/staging/comedi/drivers/dt2811.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/dt2811.c | 32 |
1 files changed, 8 insertions, 24 deletions
diff --git a/drivers/staging/comedi/drivers/dt2811.c b/drivers/staging/comedi/drivers/dt2811.c index b60ee74817b2..1fe657c803b3 100644 --- a/drivers/staging/comedi/drivers/dt2811.c +++ b/drivers/staging/comedi/drivers/dt2811.c @@ -29,10 +29,10 @@ * Configuration options: * [0] - I/O port base address * [1] - IRQ, although this is currently unused - * [2] - A/D reference - * 0 = single-ended - * 1 = differential - * 2 = pseudo-differential (common reference) + * [2] - A/D reference (# of analog inputs) + * 0 = single-ended (16 channels) + * 1 = differential (8 channels) + * 2 = pseudo-differential (16 channels) * [3] - A/D range * 0 = [-5, 5] * 1 = [-2.5, 2.5] @@ -184,9 +184,6 @@ enum { card_2811_pgh, card_2811_pgl }; struct dt2811_private { int ntrig; int curadchan; - enum { - adc_singleended, adc_diff, adc_pseudo_diff - } adc_mux; }; static int dt2811_ai_eoc(struct comedi_device *dev, @@ -293,26 +290,13 @@ static int dt2811_attach(struct comedi_device *dev, struct comedi_devconfig *it) if (!devpriv) return -ENOMEM; - switch (it->options[2]) { - case 0: - devpriv->adc_mux = adc_singleended; - break; - case 1: - devpriv->adc_mux = adc_diff; - break; - case 2: - devpriv->adc_mux = adc_pseudo_diff; - break; - default: - devpriv->adc_mux = adc_singleended; - break; - } - s = &dev->subdevices[0]; /* initialize the ADC subdevice */ s->type = COMEDI_SUBD_AI; - s->subdev_flags = SDF_READABLE | SDF_GROUND; - s->n_chan = devpriv->adc_mux == adc_diff ? 8 : 16; + s->subdev_flags = SDF_READABLE | + (it->options[2] == 1) ? SDF_DIFF : + (it->options[2] == 2) ? SDF_COMMON : SDF_GROUND; + s->n_chan = (it->options[2] == 1) ? 8 : 16; s->insn_read = dt2811_ai_insn; s->maxdata = 0xfff; switch (it->options[3]) { |