This member of the boardinfo is the number of bits in the analog output data.
Convert this member into the subdevice 'maxdata', (1 << board->dabits) - 1,
to avoid needing to do the calculation.
Use the subdevice 'maxdata' in the driver instead of using the boardinfo and
use the comedi_offset_munge() helper to convert the two's complement data to
the offset binary form that the comedi core expects.
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/dt282x.c | 31 +++++++++++++++----------------
1 file changed, 15 insertions(+), 16 deletions(-)
diff --git a/drivers/staging/comedi/drivers/dt282x.c
b/drivers/staging/comedi/drivers/dt282x.c
index 523e849..3eaf26c 100644
--- a/drivers/staging/comedi/drivers/dt282x.c
+++ b/drivers/staging/comedi/drivers/dt282x.c
@@ -213,7 +213,7 @@ struct dt282x_board {
int ai_speed;
int ispgl;
int dachan;
- int dabits;
+ unsigned int ao_maxdata;
};
static const struct dt282x_board boardtypes[] = {
@@ -224,7 +224,7 @@ static const struct dt282x_board boardtypes[] = {
.adchan_di = 8,
.ai_speed = 20000,
.dachan = 2,
- .dabits = 12,
+ .ao_maxdata = 0x0fff,
}, {
.name = "dt2821-f",
.ai_maxdata = 0x0fff,
@@ -232,7 +232,7 @@ static const struct dt282x_board boardtypes[] = {
.adchan_di = 8,
.ai_speed = 6500,
.dachan = 2,
- .dabits = 12,
+ .ao_maxdata = 0x0fff,
}, {
.name = "dt2821-g",
.ai_maxdata = 0x0fff,
@@ -240,14 +240,14 @@ static const struct dt282x_board boardtypes[] = {
.adchan_di = 8,
.ai_speed = 4000,
.dachan = 2,
- .dabits = 12,
+ .ao_maxdata = 0x0fff,
}, {
.name = "dt2823",
.ai_maxdata = 0xffff,
.adchan_di = 4,
.ai_speed = 10000,
.dachan = 2,
- .dabits = 16,
+ .ao_maxdata = 0xffff,
}, {
.name = "dt2824-pgh",
.ai_maxdata = 0x0fff,
@@ -269,28 +269,28 @@ static const struct dt282x_board boardtypes[] = {
.ai_speed = 20000,
.ispgl = 1,
.dachan = 2,
- .dabits = 12,
+ .ao_maxdata = 0x0fff,
}, {
.name = "dt2827",
.ai_maxdata = 0xffff,
.adchan_di = 4,
.ai_speed = 10000,
.dachan = 2,
- .dabits = 12,
+ .ao_maxdata = 0x0fff,
}, {
.name = "dt2828",
.ai_maxdata = 0x0fff,
.adchan_se = 4,
.ai_speed = 10000,
.dachan = 2,
- .dabits = 12,
+ .ao_maxdata = 0x0fff,
}, {
.name = "dt2829",
.ai_maxdata = 0xffff,
.adchan_se = 8,
.ai_speed = 33250,
.dachan = 2,
- .dabits = 16,
+ .ao_maxdata = 0xffff,
}, {
.name = "dt21-ez",
.ai_maxdata = 0x0fff,
@@ -298,7 +298,7 @@ static const struct dt282x_board boardtypes[] = {
.adchan_di = 8,
.ai_speed = 10000,
.dachan = 2,
- .dabits = 12,
+ .ao_maxdata = 0x0fff,
}, {
.name = "dt23-ez",
.ai_maxdata = 0xffff,
@@ -884,14 +884,13 @@ static int dt282x_ao_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
- const struct dt282x_board *board = comedi_board(dev);
struct dt282x_private *devpriv = dev->private;
- unsigned short d;
+ unsigned int d;
unsigned int chan;
chan = CR_CHAN(insn->chanspec);
d = data[0];
- d &= (1 << board->dabits) - 1;
+ d &= s->maxdata;
devpriv->ao[chan] = d;
devpriv->dacsr |= DT2821_SSEL;
@@ -900,11 +899,11 @@ static int dt282x_ao_insn_write(struct comedi_device *dev,
/* select channel */
devpriv->dacsr |= DT2821_YSEL;
if (devpriv->da0_2scomp)
- d ^= (1 << (board->dabits - 1));
+ d = comedi_offset_munge(s, d);
} else {
devpriv->dacsr &= ~DT2821_YSEL;
if (devpriv->da1_2scomp)
- d ^= (1 << (board->dabits - 1));
+ d = comedi_offset_munge(s, d);
}
outw(devpriv->dacsr, dev->iobase + DT2821_DACSR);
@@ -1284,7 +1283,7 @@ static int dt282x_attach(struct comedi_device *dev,
struct comedi_devconfig *it)
s->subdev_flags = SDF_WRITABLE;
s->insn_read = dt282x_ao_insn_read;
s->insn_write = dt282x_ao_insn_write;
- s->maxdata = (1 << board->dabits) - 1;
+ s->maxdata = board->ao_maxdata;
s->range_table_list = devpriv->darangelist;
devpriv->darangelist[0] =
opt_ao_range_lkup(it->options[opt_ao0_range]);
--
1.9.3
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