Use the comedi_offset_munge() helper to do the offset binary to two's complement conversion when writing a new analog output value. Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx> Cc: Ian Abbott <abbotti@xxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/staging/comedi/drivers/quatech_daqp_cs.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/staging/comedi/drivers/quatech_daqp_cs.c b/drivers/staging/comedi/drivers/quatech_daqp_cs.c index 23c79e3..9514544 100644 --- a/drivers/staging/comedi/drivers/quatech_daqp_cs.c +++ b/drivers/staging/comedi/drivers/quatech_daqp_cs.c @@ -594,11 +594,9 @@ static int daqp_ao_insn_write(struct comedi_device *dev, s->readback[chan] = val; - val &= 0x0fff; - val ^= 0x0800; /* Flip the sign */ - val |= (chan << 12); - - outw(val, dev->iobase + DAQP_DA); + /* write the two's complement value to the channel */ + outw((chan << 12) | comedi_offset_munge(s, val), + dev->iobase + DAQP_DA); } return insn->n; -- 2.5.1 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
