diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2013-09-20 23:40:23 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-25 22:59:59 (GMT) |
| commit | 08cd3e1684894e7d541ea92efb8756f7f43453a7 (patch) | |
| tree | 0d9934ae64edbd4f5f0d820aac29804a1e7c8a75 | |
| parent | fe4489a5b2047c94ce0ce80b21e2aa3d4b657c0a (diff) | |
| download | linux-fsl-qoriq-08cd3e1684894e7d541ea92efb8756f7f43453a7.tar.xz | |
staging: comedi: pcl711: add differential input support for 8112 boards
The ACL-8112 boards can do differential analog inputs. Add support for
this 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>
| -rw-r--r-- | drivers/staging/comedi/drivers/pcl711.c | 17 |
1 files 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; |