Currently the (*insn_read) function for the digital input subdevice
returns the state for a single channel. It's more efficient to use
the (*insn_bits) function and return the state for all the channels.
The comedi core can use the (*insn_bits) to emulate the (*insn_read)
if needed.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfonudation.org>
---
drivers/staging/comedi/drivers/dt9812.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)
diff --git a/drivers/staging/comedi/drivers/dt9812.c
b/drivers/staging/comedi/drivers/dt9812.c
index 594b97f..a3b5de1 100644
--- a/drivers/staging/comedi/drivers/dt9812.c
+++ b/drivers/staging/comedi/drivers/dt9812.c
@@ -607,18 +607,21 @@ static int dt9812_analog_out(struct comedi_device *dev,
int channel, u16 value)
return ret;
}
-static int dt9812_di_rinsn(struct comedi_device *dev,
- struct comedi_subdevice *s, struct comedi_insn *insn,
- unsigned int *data)
+static int dt9812_di_insn_bits(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned int *data)
{
- unsigned int channel = CR_CHAN(insn->chanspec);
- int n;
u8 bits = 0;
+ int ret;
- dt9812_digital_in(dev, &bits);
- for (n = 0; n < insn->n; n++)
- data[n] = ((1 << channel) & bits) != 0;
- return n;
+ ret = dt9812_digital_in(dev, &bits);
+ if (ret)
+ return ret;
+
+ data[1] = bits;
+
+ return insn->n;
}
static int dt9812_do_winsn(struct comedi_device *dev,
@@ -837,7 +840,7 @@ static int dt9812_auto_attach(struct comedi_device *dev,
s->n_chan = 8;
s->maxdata = 1;
s->range_table = &range_digital;
- s->insn_read = dt9812_di_rinsn;
+ s->insn_bits = dt9812_di_insn_bits;
/* Digital Output subdevice */
s = &dev->subdevices[1];
--
1.8.1.4
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