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staging: comedi: cb_pcimdas: support analog input programmable ranges

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The hardware uses a switch on the board to select if the analog inputs
are bipolar or uinipolar. The gain is programmable to allow the following
input ranges:

  Gain  Bipolar   Unipolar
    0   +/-10V    0 to 10V
    1   +/-5V     0 to 5V
    2   +/-2.5V   0 to 2.5V
    3   +/-1.25V  0 to 1.25V

Add the necessary code to the driver to allow the user to select the
desired range.

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
2015-02-25 16:28:39 -07:00
committed by Greg Kroah-Hartman
parent 532a411e8b
commit c7549d770a
1 changed files with 38 additions and 4 deletions
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42
drivers/staging/comedi/drivers/cb_pcimdas.c
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@@ -74,6 +74,24 @@
#define RESID_COUNT_H 13
#define RESID_COUNT_L 14
static const struct comedi_lrange cb_pcimdas_ai_bip_range = {
4, {
BIP_RANGE(10),
BIP_RANGE(5),
BIP_RANGE(2.5),
BIP_RANGE(1.25)
}
};
static const struct comedi_lrange cb_pcimdas_ai_uni_range = {
4, {
UNI_RANGE(10),
UNI_RANGE(5),
UNI_RANGE(2.5),
UNI_RANGE(1.25)
}
};
/*
* this structure is for data unique to this hardware driver. If
* several hardware drivers keep similar information in this structure,
@@ -105,9 +123,10 @@ static int cb_pcimdas_ai_rinsn(struct comedi_device *dev,
struct comedi_insn *insn, unsigned int *data)
{
struct cb_pcimdas_private *devpriv = dev->private;
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int range = CR_RANGE(insn->chanspec);
int n;
unsigned int d;
int chan = CR_CHAN(insn->chanspec);
unsigned short chanlims;
int ret;
@@ -123,8 +142,8 @@ static int cb_pcimdas_ai_rinsn(struct comedi_device *dev,
/* set bursting off, conversions on */
outb(0x01, devpriv->BADR3 + 6);
/* set range to 10V. UP/BP is controlled by a switch on the board */
outb(0x00, devpriv->BADR3 + 7);
/* set range */
outb(range, devpriv->BADR3 + 7);
/*
* write channel limits to multiplexer, set Low (bits 0-3) and
@@ -185,6 +204,20 @@ static bool cb_pcimdas_is_ai_se(struct comedi_device *dev)
return status & 0x20;
}
static bool cb_pcimdas_is_ai_uni(struct comedi_device *dev)
{
struct cb_pcimdas_private *devpriv = dev->private;
unsigned int status;
/*
* The Analog Input range polarity is set with the
* Analog Input Polarity Switch on the board. The
* inputs can be set to Unipolar or Bipolar ranges.
*/
status = inb(devpriv->BADR3 + 2);
return status & 0x40;
}
static int cb_pcimdas_auto_attach(struct comedi_device *dev,
unsigned long context_unused)
{
@@ -222,7 +255,8 @@ static int cb_pcimdas_auto_attach(struct comedi_device *dev,
s->n_chan = 8;
}
s->maxdata = 0xffff;
s->range_table = &range_unknown;
s->range_table = cb_pcimdas_is_ai_uni(dev) ? &cb_pcimdas_ai_uni_range
: &cb_pcimdas_ai_bip_range;
s->len_chanlist = 1; /* This is the maximum chanlist length that */
/* the board can handle */
s->insn_read = cb_pcimdas_ai_rinsn;