From: Hans de Goede <hdegoede@redhat.com>
To: Jiri Kosina <jikos@kernel.org>,
Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: Hans de Goede <hdegoede@redhat.com>, linux-input@vger.kernel.org
Subject: [PATCH] HID: lg-g15: Do not fail the probe when we fail to disable F# emulation
Date: Sun, 15 Mar 2020 18:34:49 +0100 [thread overview]
Message-ID: <20200315173449.24857-1-hdegoede@redhat.com> (raw)
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")
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1806321
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
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 */
--
2.25.1
next reply other threads:[~2020-03-15 17:35 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-15 17:34 Hans de Goede [this message]
2020-03-20 23:12 ` [PATCH] HID: lg-g15: Do not fail the probe when we fail to disable F# emulation Jiri Kosina
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