Linus Walleij bee448390e iio: afe: rescale: Accept only offset channels ... As noted by Jonathan Cameron: it is perfectly legal for a channel to have an offset but no scale in addition to the raw interface. The conversion will imply that scale is 1:1. Make rescale_configure_channel() accept just scale, or just offset to process a channel. When a user asks for IIO_CHAN_INFO_OFFSET in rescale_read_raw() we now have to deal with the fact that OFFSET could be present but SCALE missing. Add code to simply scale 1:1 in this case. Link: https://lore.kernel.org/linux-iio/CACRpkdZXBjHU4t-GVOCFxRO-AHGxKnxMeHD2s4Y4PuC29gBq6g@mail.gmail.com/ Fixes: 53ebee9499 ("iio: afe: iio-rescale: Support processed channels") Fixes: 9decacd8b3 ("iio: afe: rescale: Fix boolean logic bug") Reported-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Peter Rosin <peda@axentia.se> Link: https://lore.kernel.org/r/20230902-iio-rescale-only-offset-v2-1-988b807754c8@linaro.org Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>		2023-10-17 20:25:32 +01:00
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iio-rescale.c	iio: afe: rescale: Accept only offset channels	2023-10-17 20:25:32 +01:00
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