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+ Gain is documented and sent to the hardware as a value in the range 0 to
65535, but the module parameter and sysfs attribute accept wider integer
values. Store gain as a u16 and parse sysfs writes with kstrtou16 so
out-of-range values are rejected instead of being silently changed.
+ This constrains only the configured value. Calculations combining gain
values still require a wider intermediate to cover the product of two
full-range 16-bit values.
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This reverts commit c26573d77369c042dc2b9a881a7f2ff88ddc0dd9.
+ `on_hid_hw_open` is apparently new enough that common distros don't
have it yet, so let's wait a few years and try again. The old method
works well enough and if not, just set `open_mode=0`.
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+ Seems some applications can mess with input_dev->open, still unclear
how but on_hid_hw_open seems to be a bit more reliable so use it for
now at least
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+ Courtesy of @BDave95
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+ Effects handlers were being called in a locked context,
which in this case happened to work due to how `hid_hw_request`
is implemented. Now, only the selected state is updated and the heavy
lifting of making the wheel aware of the requested changes is done
after the critical section.
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