linux-kernel - [PATCH 1/4] dell-wmi: Ignore WMI event code 0xe045

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Date:	Sun, 22 May 2016 13:36:20 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>,
	Darren Hart <dvhart@...radead.org>,
	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	Michał Kępień <kernel@...pniu.pl>,
	Mario Limonciello <mario_limonciello@...l.com>,
	Andy Lutomirski <luto@...nel.org>,
	Alex Hung <alex.hung@...onical.com>
Cc:	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pali Rohár <pali.rohar@...il.com>,
	Matthew Garrett <mjg@...hat.com>
Subject: [PATCH 1/4] dell-wmi: Ignore WMI event code 0xe045

>From Dell we know that WMI event code 0xe045 is for Num Lock key, but it is
unclear due to message in commit 0b3f6109f0c9 ("dell-wmi: new driver for
hotkey control").

Signed-off-by: Pali Rohár <pali.rohar@...il.com>
Cc: Matthew Garrett <mjg@...hat.com>
Cc: Mario Limonciello <mario_limonciello@...l.com>
Link: https://lkml.org/lkml/2015/7/7/830
---
 drivers/platform/x86/dell-wmi.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
index 15c6f11..4d23c91 100644
--- a/drivers/platform/x86/dell-wmi.c
+++ b/drivers/platform/x86/dell-wmi.c
@@ -88,7 +88,6 @@ static const struct dmi_system_id dell_wmi_smbios_list[] __initconst = {
 static const struct key_entry dell_wmi_legacy_keymap[] __initconst = {
 	{ KE_IGNORE, 0x003a, { KEY_CAPSLOCK } },
 
-	{ KE_KEY, 0xe045, { KEY_PROG1 } },
 	{ KE_KEY, 0xe009, { KEY_EJECTCD } },
 
 	/* These also contain the brightness level at offset 6 */
@@ -130,7 +129,19 @@ static const struct key_entry dell_wmi_legacy_keymap[] __initconst = {
 	{ KE_IGNORE, 0xe033, { KEY_KBDILLUMUP } },
 	{ KE_IGNORE, 0xe034, { KEY_KBDILLUMDOWN } },
 	{ KE_IGNORE, 0xe03a, { KEY_CAPSLOCK } },
+
+	/*
+	 * This entry is very suspicious!
+	 * Originally Matthew Garrett created this dell-wmi driver specially for
+	 * "button with a picture of a battery" which has event code 0xe045.
+	 * Later Mario Limonciello from Dell told us that event code 0xe045 is
+	 * reported by Num Lock and should be ignored because key is send also
+	 * by keyboard controller.
+	 * So for now we will ignore this event to prevent potential double
+	 * Num Lock key press.
+	 */
 	{ KE_IGNORE, 0xe045, { KEY_NUMLOCK } },
+
 	{ KE_IGNORE, 0xe046, { KEY_SCROLLLOCK } },
 	{ KE_IGNORE, 0xe0f7, { KEY_MUTE } },
 	{ KE_IGNORE, 0xe0f8, { KEY_VOLUMEDOWN } },
-- 
1.7.9.5