Add support for CameraShutter

[yinyue200]

Add support for CameraShutter on UX5401 and UX5406 to resolve the issue of the LED light not responding on the corresponding button.

See also: https://github.com/Kuchteq/asus-shutter-linux

[seerge]

@yinyue200 hello,

Interesting, thanks for a contribution and a good find. I was looking for an endpoint for camera by myself, but other owners of laptops that have this hotkey were not really helpful :)

Do I understand correctly that Program.acpi.DeviceGet(AsusACPI.CameraShutter) on the device always returns correct shutter status ? (i.e. 0 or 1)

Cause if so, just checking for a value being >=0 (i.e. if endpoint exists in general) would be enough instead of hardcoding models list under AppConfig.IsCameraShutter() :)

[seerge]

@yinyue200 I have replaced IsCameraShutter() with just direct endpoint value check based on this assumption.

As for you it seem to always return a value, and on the device that does not support it (like mine) endpoint doesn't exist at all. This is how most of the endpoints work on Asus devices and how G-Helper usually hides unsupported features from UI :)

c6ea0b0

[yinyue200]

Yes, on my device, the return value is always 0 or 1. If this endpoint returns a negative value on devices that do not support CameraShutter, then there should be no problem. Thank you for your fix!

[seerge]

@yinyue200 yes, all endpoints that DSTS (DeviceGet) command returns contain a "presence" bit, that's why to get actual value I deduct it from result (i.e. deduct 65536 from int value)

g-helper/app/AsusACPI.cs

Line 411 in c6ea0b0

public int DeviceGet(uint DeviceID)

And then, if result is < 0 it means endpoint doesn't exist at all.

Pro-tip: You can add "debug": 1, to config.json in the app, and then under Extra section you will see a zoom-glass button that runs a scan over all endpoints on your device. May be you will find something interesting there :)