Linux Input Archive on
 help / color / Atom feed
* [PATCH] HID: lg-g15: Do not fail the probe when we fail to disable F# emulation
@ 2020-03-15 17:34 Hans de Goede
  2020-03-20 23:12 ` Jiri Kosina
  0 siblings, 1 reply; 2+ messages in thread
From: Hans de Goede @ 2020-03-15 17:34 UTC (permalink / raw)
  To: Jiri Kosina, Benjamin Tissoires; +Cc: Hans de Goede, linux-input

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: ad4203f5a243 ("HID: lg-g15: Add support for the G510 keyboards' gaming keys")
Signed-off-by: Hans de Goede <>
 drivers/hid/hid-lg-g15.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-lg-g15.c b/drivers/hid/hid-lg-g15.c
index 8a9268a5c66a..ad4b5412a9f4 100644
--- a/drivers/hid/hid-lg-g15.c
+++ b/drivers/hid/hid-lg-g15.c
@@ -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 */

^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, back to index

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-03-15 17:34 [PATCH] HID: lg-g15: Do not fail the probe when we fail to disable F# emulation Hans de Goede
2020-03-20 23:12 ` Jiri Kosina

Linux Input Archive on

Archives are clonable:
	git clone --mirror linux-input/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-input linux-input/ \
	public-inbox-index linux-input

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone