redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

staging: comedi: pcl711: add differential input support for 8112 boards

Browse source 
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>
This commit is contained in:
H Hartley Sweeten 2013-09-20 16:40:23 -07:00 committed by Greg Kroah-Hartman
parent fe4489a5b2
commit 08cd3e1684
1 changed files with 13 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
drivers/staging/comedi/drivers/pcl711.c
View file

@ -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;