iio: dac: ad5758: Fix the offset calculation

The offset is a count of DAC codes, so the microamp or microvolt units
of min and max cancel out and the final division by 1000 is wrong. For
the +-20 mA range the driver reports -32 instead of -32768. For the
+-5 V and +-10 V ranges min * (1 << 16) also overflows int, and the
reported offset is 0.

Drop the division and do the multiplication in 64 bits.

Fixes: 28d1a7ac2a0d ("iio: dac: Add AD5758 support")
Signed-off-by: Arka Mondal <arka@arkamondal.net>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

0 files changed, 0 insertions, 0 deletions