Manage controller power with PC

[charlesmunger]

Feature Description

If the computer is asleep and the controller powers on, the computer should wake up; when the computer suspends or turns off, it should power off the controller.

Use Case

Other wireless controllers like the Xbox Elite Series 2 with xone driver do this, and it's quite convenient; consoles also behave this way and it's quite nice.

Proposed Solution

Work is required in the kernel driver to mark the flydigi dongle as a wakeup device, and some reverse engineering may be needed to figure out how to turn off the controller in response to a suspend signal.

[charlesmunger]

So, poking around, it seems like:

1. The dongle doesn't show up on the usb bus at all unless a controller is connected
2. When the controller is connected, it has bmAttributes 0x80 (Bus Powered), and thus cannot wake from sleep on its own
3. Interestingly, the charger dock 2, which is usb 37d7:6001 DOES advertise remote wakeup support:

    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup

But alas I can't figure out what, if anything actually triggers it. Putting the controller in the dock or removing it does not seem to have any effect, neither does plugging in or unplugging usb devices. At some point I did see runtime_active_time increase indicating that it woke up, but I can't figure out what made that happen.