linux-kernel - [PATCH v2] platform/x86: dell-laptop: fix broken kbd backlight on Inspiron 10xx

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Message-ID: <156940489220.8635.14349142383780268583@WARFSTATION>
Date:   Wed, 25 Sep 2019 11:48:12 +0200
From:   Pacien TRAN-GIRARD <pacien.trangirard@...ien.net>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Pali Rohár <pali.rohar@...il.com>,
        Mario Limonciello <Mario.Limonciello@...l.com>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] platform/x86: dell-laptop: fix broken kbd backlight on Inspiron 10xx

This patch adds a quirk disabling keyboard backlight support for the
Dell Inspiron 1012 and 1018.

Those models wrongly report supporting keyboard backlight control
features (through SMBIOS tokens) even though they're not equipped with
a backlit keyboard. This led to broken controls being exposed
through sysfs by this driver which froze the system when used.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=107651
Signed-off-by: Pacien TRAN-GIRARD <pacien.trangirard@...ien.net>
---
 drivers/platform/x86/dell-laptop.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index d27be2836bc2..ffe5abbdadda 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -33,6 +33,7 @@
 
 struct quirk_entry {
 	bool touchpad_led;
+	bool kbd_broken_backlight;
 	bool kbd_led_levels_off_1;
 	bool kbd_missing_ac_tag;
 
@@ -73,6 +74,10 @@ static struct quirk_entry quirk_dell_latitude_e6410 = {
 	.kbd_led_levels_off_1 = true,
 };
 
+static struct quirk_entry quirk_dell_inspiron_1012 = {
+	.kbd_broken_backlight = true,
+};
+
 static struct platform_driver platform_driver = {
 	.driver = {
 		.name = "dell-laptop",
@@ -310,6 +315,24 @@ static const struct dmi_system_id dell_quirks[] __initconst = {
 		},
 		.driver_data = &quirk_dell_latitude_e6410,
 	},
+	{
+		.callback = dmi_matched,
+		.ident = "Dell Inspiron 1012",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
+		},
+		.driver_data = &quirk_dell_inspiron_1012,
+	},
+	{
+		.callback = dmi_matched,
+		.ident = "Dell Inspiron 1018",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1018"),
+		},
+		.driver_data = &quirk_dell_inspiron_1012,
+	},
 	{ }
 };
 
@@ -2040,6 +2063,9 @@ static int __init kbd_led_init(struct device *dev)
 {
 	int ret;
 
+	if (quirks && quirks->kbd_broken_backlight)
+		return -ENODEV;
+
 	kbd_init();
 	if (!kbd_led_present)
 		return -ENODEV;
-- 
2.19.2