HID: logitech-hidpp: Silence protocol errors on newer lightspeed receivers

Browse source

When logitech-hidpp tries to communicate with an unreachable device paired
to a 046d:c547 lightspeed receiver, the following message is printed to the
console:

hidpp_root_get_protocol_version: received protocol error 0x08

This occurs because this receiver returns 0x08 (HIDPP_ERROR_UNKNOWN_DEVICE)
when a device is unreachable, compared to 0x09 (HIDPP_ERROR_RESOURCE_ERROR)
that the older receivers return.

This patch silences this harmless error by treating
HIDPP_ERROR_UNKNOWN_DEVICE the same as HIDPP_ERROR_RESOURCE_ERROR
in hidpp_root_get_protocol_version().

There are other checks for HIDPP_ERROR_RESOURCE_ERROR found in
battery-related functions, however this receiver does not trigger them when
the device is disconnected.

Signed-off-by: Mavroudis Chatzilazaridis <mavchatz@protonmail.com>
Tested-by: Stuart Hayhurst <stuart.a.hayhurst@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

...

This commit is contained in:

Mavroudis Chatzilazaridis 2025-10-02 19:24:37 +00:00 • committed by Jiri Kosina

parent 5329fc30cb

commit 55cafcac08

1 changed files with 2 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

3

drivers/hid/hid-logitech-hidpp.c

View file