staging: comedi: adv_pci1710: support external analog output reference

The analog outputs can use an external reference to create the D/A output
range. Add an entry to the comedi_lrange table for it and modify the
(*insn_write) to support it.

Note that the D/A output range is 0 to +Vref with a -Vref. The comedi_lrange
does not include the sign of the range. It simmply allows the user to convert
between the 12-bit samples values (0x0000 - 0x0fff) and a physical value (0.0
to 1.0) using the comedilib comedi_to_phys() and comedi_from_phys() functions.
A physical value of 0.0 would actually be 0V with a -Vref and -V with a +Vref
and 1.0 would be +V with a -Vref and 0V with a -Vref. Ths user will need to
work this out but at least they can now use the external reference.

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>

diff --git a/drivers/staging/comedi/drivers/adv_pci1710.c b/drivers/staging/comedi/drivers/adv_pci1710.c
index cc451f1..aafcb8a 100644 (file)
--- a/drivers/staging/comedi/drivers/adv_pci1710.c
+++ b/drivers/staging/comedi/drivers/adv_pci1710.c
@@ -65,6 +65,8 @@
 #define PCI171X_CLRFIFO_REG    0x09    /* W:   clear FIFO */
 #define PCI171X_DA_REG(x)      (0x0a + ((x) * 2)) /* W:   D/A register */
 #define PCI171X_DAREF_REG      0x0e    /* W:   D/A reference control */
+#define PCI171X_DAREF(c, r)    (((r) & 0x3) << ((c) * 2))
+#define PCI171X_DAREF_MASK(c)  PCI171X_DAREF((c), 0x3)
 #define PCI171X_DI_REG         0x10    /* R:   digital inputs */
 #define PCI171X_DO_REG         0x10    /* W:   digital outputs */
 #define PCI171X_TIMER_BASE     0x18    /* R/W: 8254 timer */
@@ -111,9 +113,10 @@ static const struct comedi_lrange pci1711_ai_range = {
 };
 
 static const struct comedi_lrange pci171x_ao_range = {
-       2, {
-               UNI_RANGE(5),
-               UNI_RANGE(10)
+       3, {
+               UNI_RANGE(5),           /* internal -5V ref */
+               UNI_RANGE(10),          /* internal -10V ref */
+               RANGE_ext(0, 1)         /* external -Vref (+/-10V max) */
        }
 };
 
@@ -631,8 +634,8 @@ static int pci1710_ao_insn_write(struct comedi_device *dev,
        unsigned int val = s->readback[chan];
        int i;
 
-       devpriv->da_ranges &= ~(1 << (chan << 1));
-       devpriv->da_ranges |= (range << (chan << 1));
+       devpriv->da_ranges &= ~PCI171X_DAREF_MASK(chan);
+       devpriv->da_ranges |= PCI171X_DAREF(chan, range);
        outw(devpriv->da_ranges, dev->iobase + PCI171X_DAREF_REG);
 
        for (i = 0; i < insn->n; i++) {