Allow fan control via character device (e.g. "echo 1 > /dev/acer-max-fan-0")

[TheFeshy]

Creates a fan control device for any of the listed laptops with a fan quirk. This device can accept ascii or binary input (e.g. can be written to with echo, or via a program like python writing 0x00 and 0x01.)

echo 1 > /dev/acer-max-fan-0 to turn on, echo 0 > /dev/acer-max-fan-0 to turn off again.

I split the capabilities so that we can distinguish between laptops that have a turbo button, and laptops that don't but still have the fans controlled via the EC. I put my own laptop (the PH517-61) in this category, and also the PH517-51 (as it's the same laptop but with Intel/Nvidia.)

[JafarAkhondali]

Thanks @TheFeshy
Can you please add sample usage to readme?
Can someone test this functionality on your device please?

[hornc]

@JafarAkhondali I'll try to test this in the next few days.

[hornc]

Ok, I have checked out the PR and re-installed on my AN515-57. It took a reboot to have the device show up under

/dev/acer-fan-max-0

After a bit of messing around I realized the test commands above are wrong, it has max-fan instead of the correct device fan-max

it should be:

echo 1 > /dev/acer-fan-max-0 to turn on, echo 0 > /dev/acer-fan-max-0 to turn off again.

I was able to run both commands without sudo, but didn't notice any obvious change in fan speed or behavior however.

When I run sensors I don't see any fan info normally. I have not set up any other fan monitoring sw.