HID: logitech-hidpp: add battery support for HID++ 2.0 devices
If the 0x1000 Unified Battery Level Status feature exists, expose the battery level. The main drawback is that while a device is plugged in its battery level is 0. To avoid exposing that as 0% charge we make up a number based on the charging status. Signed-off-by:Peter Hutterer <peter.hutterer@who-t.net> Signed-off-by:
Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by:
Jiri Kosina <jkosina@suse.cz>
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