The ACL-8112 boards can do differential analog inputs. Add support for
this mode.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/pcl711.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/comedi/drivers/pcl711.c
b/drivers/staging/comedi/drivers/pcl711.c
index 8aa3d92..1386d8f 100644
--- a/drivers/staging/comedi/drivers/pcl711.c
+++ b/drivers/staging/comedi/drivers/pcl711.c
@@ -82,6 +82,7 @@ supported.
#define PCL711_MUX_CHAN(x) (((x) & 0xf) << 0)
#define PCL711_MUX_CS0 (1 << 4)
#define PCL711_MUX_CS1 (1 << 5)
+#define PCL711_MUX_DIFF (PCL711_MUX_CS0 | PCL711_MUX_CS1)
#define PCL711_MODE 0x0b
#define PCL711_SOFTTRIG 0x0c
#define PCL711_DO_LO 0x0d
@@ -229,16 +230,22 @@ static void pcl711_set_changain(struct comedi_device *dev,
const struct pcl711_board *board = comedi_board(dev);
unsigned int chan = CR_CHAN(chanspec);
unsigned int range = CR_RANGE(chanspec);
+ unsigned int aref = CR_AREF(chanspec);
unsigned int mux = 0;
outb(range, dev->iobase + PCL711_GAIN);
if (board->is_8112) {
/* Select the correct MPC508A chip */
- if (chan < 8)
- mux |= PCL711_MUX_CS0;
- else
- mux |= PCL711_MUX_CS1;
+ if (aref == AREF_DIFF) {
+ chan &= 0x7;
+ mux |= PCL711_MUX_DIFF;
+ } else {
+ if (chan < 8)
+ mux |= PCL711_MUX_CS0;
+ else
+ mux |= PCL711_MUX_CS1;
+ }
}
outb(mux | PCL711_MUX_CHAN(chan), dev->iobase + PCL711_MUX_REG);
}
@@ -515,6 +522,8 @@ static int pcl711_attach(struct comedi_device *dev, struct
comedi_devconfig *it)
s = &dev->subdevices[0];
s->type = COMEDI_SUBD_AI;
s->subdev_flags = SDF_READABLE | SDF_GROUND;
+ if (board->is_8112)
+ s->subdev_flags |= SDF_DIFF;
s->n_chan = board->n_aichan;
s->maxdata = 0xfff;
s->range_table = board->ai_range_type;
--
1.8.3.2
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