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HID: lg-g15: Do not fail the probe when we fail to disable F# emulation 

By default the G1-G12 keys on the Logitech gaming keyboards send
F1 - F12 when in "generic HID" mode.

The first thing the hid-lg-g15 driver does is disable this behavior.

We have received a bugreport that this does not work when the keyboard
is connected through an Aten KVM switch. Using a gaming keyboard with
a KVM is a bit weird setup, but still we can try to fail a bit more
gracefully here.

On the G510 keyboards the same USB-interface which is used for the gaming
keys is also used for the media-keys. Before this commit we would call
hid_hw_stop() on failure to disable the F# emulation and then exit the
probe method with an error code.

This not only causes us to not handle the gaming-keys, but this also
breaks the media keys which is a regression compared to the situation
when these keyboards where handled by the generic hidinput driver.

This commit changes the error handling to clear the hiddev drvdata
(to disable our .raw_event handler) and then returning from the probe
method with success.

The net result of this is that, when connected through a KVM, things
work as well as they did before the hid-lg-g15 driver was introduced.

Fixes: ad4203f5a2 ("HID: lg-g15: Add support for the G510 keyboards' gaming keys")
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1806321
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Hans de Goede 2020-03-15 18:34:49 +01:00 committed by Jiri Kosina
parent 819d578d51
commit b8a75eadda
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/hid/hid-lg-g15.c
View File

@ -803,8 +803,10 @@ static int lg_g15_probe(struct hid_device *hdev, const struct hid_device_id *id)
}
if (ret < 0) {
hid_err(hdev, "Error disabling keyboard emulation for the G-keys\n");
goto error_hw_stop;
hid_err(hdev, "Error %d disabling keyboard emulation for the G-keys, falling back to generic hid-input driver\n",
ret);
hid_set_drvdata(hdev, NULL);
return 0;
}
/* Get initial brightness levels */