staging: iio: adt7316: fix the dac write calculation

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commit 78accaea11 upstream.

The lsb calculation is not masking the correct bits from the user input.
Subtract 1 from (1 << offset) to correctly set up the mask to be applied
to user input.

The lsb register stores its value starting at the bit 7 position.
adt7316_store_DAC() currently assumes the value is at the other end of the
register. Shift the lsb value before storing it in a new variable lsb_reg,
and write this variable to the lsb register.

Fixes: 35f6b6b86e ("staging: iio: new ADT7316/7/8 and ADT7516/7/9 driver")
Signed-off-by: Jeremy Fertic <jeremyfertic@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Jeremy Fertic 2018-12-22 21:57:43 -07:00 • committed by Ben Hutchings

parent cc7c2fefb9

commit b9e04b7c62

1 changed files with 7 additions and 3 deletions

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drivers/staging/iio/addac/adt7316.c

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