The analog outputs expect 2's complement data. For aesthetics, use
the helper function to handle the munging instead of depending on
the boardinfo 'resolution'.
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/das1800.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/staging/comedi/drivers/das1800.c
b/drivers/staging/comedi/drivers/das1800.c
index 6795f3e..f870824 100644
--- a/drivers/staging/comedi/drivers/das1800.c
+++ b/drivers/staging/comedi/drivers/das1800.c
@@ -1132,8 +1132,7 @@ static int das1800_ao_insn_write(struct comedi_device
*dev,
unsigned short output;
unsigned long irq_flags;
- /* card expects two's complement data */
- output = data[0] - (1 << (board->resolution - 1));
+ output = comedi_offset_munge(s, data[0]);
/* if the write is to the 'update' channel, we need to remember its
value */
if (chan == update_chan)
devpriv->ao_update_bits = output;
--
2.6.3
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