linux-kernel - [PATCH 1/3] platform/x86: asus-wmi: Add quirk wmi_ignore

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Message-Id: <20221221-asus-fan-v1-1-e07f3949725b@weissschuh.net>
Date:   Wed, 21 Dec 2022 17:59:49 +0000
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     Corentin Chary <corentin.chary@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        "Luke D. Jones" <luke@...nes.dev>
Cc:     acpi4asus-user@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 1/3] platform/x86: asus-wmi: Add quirk wmi_ignore_fan

Some laptops have a fan device listed in their ACPI tables but do not
actually contain a fan.
Introduce a quirk that can be used to override the fan detection logic.

This was observed with a ASUS VivoBook E410MA running firmware
E410MAB.304.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 drivers/platform/x86/asus-wmi.c | 4 +++-
 drivers/platform/x86/asus-wmi.h | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 6f81b2844dcb..4a289ca7e76c 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -2243,7 +2243,9 @@ static int asus_wmi_fan_init(struct asus_wmi *asus)
 	asus->fan_type = FAN_TYPE_NONE;
 	asus->agfn_pwm = -1;
 
-	if (asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_CPU_FAN_CTRL))
+	if (asus->driver->quirks->wmi_ignore_fan)
+		asus->fan_type = FAN_TYPE_NONE;
+	else if (asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_CPU_FAN_CTRL))
 		asus->fan_type = FAN_TYPE_SPEC83;
 	else if (asus_wmi_has_agfn_fan(asus))
 		asus->fan_type = FAN_TYPE_AGFN;
diff --git a/drivers/platform/x86/asus-wmi.h b/drivers/platform/x86/asus-wmi.h
index 65316998b898..a478ebfd34df 100644
--- a/drivers/platform/x86/asus-wmi.h
+++ b/drivers/platform/x86/asus-wmi.h
@@ -38,6 +38,7 @@ struct quirk_entry {
 	bool store_backlight_power;
 	bool wmi_backlight_set_devstate;
 	bool wmi_force_als_set;
+	bool wmi_ignore_fan;
 	enum asus_wmi_tablet_switch_mode tablet_switch_mode;
 	int wapf;
 	/*

-- 
2.39.0