Re: Method to power off HID device from driver?

On Tue, Jan 24, 2017 at 1:47 AM, Bastien Nocera [off-list ref] wrote:

On Thu, 2017-01-19 at 10:07 -0800, Roderick Colenbrander wrote:

quoted

On Thu, Jan 19, 2017 at 8:26 AM, Bastien Nocera [off-list ref]
wrote:

quoted

On Thu, 2017-01-19 at 08:18 -0800, Roderick Colenbrander wrote:

quoted

In my case it are Hid packets to trigger a disconnect.

"HID packets" isn't a hardware transport.

My reply was a little too quick. The devices we like this capability
for are Bluetooth and USB based, so for Bluetooth we care about uhid
/
bt-hidp and for USB usb-hid.

What's the use case for USB based devices? Is this to "switch off" pads
like on XBox and Playstation consoles? I'm pretty sure the devices are
still on. Do you expect an unplug/replug to be necessary for USB
devices?

The main use case for USB devices is the PlayStation dongle which is a
device which can be used to use a DS4 on a PC. Behind the scenes a USB
to Bluetooth bridge, but it hides the Bluetooth from the OS. The
dongle would always be on, but a way is needed to disconnect the DS4
from it else the battery would drain. I don't intend to turn off the
dongle itself or a USB connected DS4, I suspect that's already doable
somehow through USB sysfs nodes nor do I know of a HID method to
disconnect the device in those cases.