[ Upstream commit 1f87b0cd32b3456d7efdfb017fcf74d0bfe3ec29 ]
According to hidpp20_batterylevel_get_battery_info my Logitech K270 keyboard reports only 2 battery levels. This matches with what I've seen after testing with batteries at varying level of fullness, it always reports either 5% or 30%.
Windows reports "battery good" for the 30% level. I've captured an USB trace of Windows reading the battery and it is getting the same info as the Linux hidpp code gets.
Now that Linux handles these devices as hidpp devices, it reports the battery as being low as it treats anything under 31% as low, this leads to the user constantly getting a "Keyboard battery is low" warning from GNOME3, which is very annoying.
This commit fixes this by changing the low threshold to anything under 30%, which I assume is what Windows does.
Signed-off-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Jiri Kosina jkosina@suse.cz Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hid/hid-logitech-hidpp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c index ffd30c7492df8..e74fa990ba133 100644 --- a/drivers/hid/hid-logitech-hidpp.c +++ b/drivers/hid/hid-logitech-hidpp.c @@ -1021,7 +1021,11 @@ static int hidpp_map_battery_level(int capacity) { if (capacity < 11) return POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; - else if (capacity < 31) + /* + * The spec says this should be < 31 but some devices report 30 + * with brand new batteries and Windows reports 30 as "Good". + */ + else if (capacity < 30) return POWER_SUPPLY_CAPACITY_LEVEL_LOW; else if (capacity < 81) return POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;