linux-kernel - [PATCH 5/8] platform/x86: asus-wmi: don't allow eGPU switching if eGPU not connected

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Date:   Tue, 20 Jun 2023 14:56:38 +1200
From:   "Luke D. Jones" <luke@...nes.dev>
To:     hdegoede@...hat.com
Cc:     corentin.chary@...il.com, acpi4asus-user@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hwmon@...r.kernel.org, markgross@...nel.org,
        jdelvare@...e.com, linux@...ck-us.net,
        "Luke D. Jones" <luke@...nes.dev>
Subject: [PATCH 5/8] platform/x86: asus-wmi: don't allow eGPU switching if eGPU not connected

Check the ASUS_WMI_DEVID_EGPU_CONNECTED method for eGPU connection
before allowing the ASUS_WMI_DEVID_EGPU method to run.

Signed-off-by: Luke D. Jones <luke@...nes.dev>
---
 drivers/platform/x86/asus-wmi.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 0c8a4a46b121..821addb284d7 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -693,6 +693,15 @@ static ssize_t egpu_enable_store(struct device *dev,
 	if (enable > 1)
 		return -EINVAL;
 
+	err = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_EGPU_CONNECTED);
+	if (err < 0)
+		return err;
+	if (err < 1) {
+		err = -ENODEV;
+		pr_warn("Failed to set egpu disable: %d\n", err);
+		return err;
+	}
+
 	err = asus_wmi_set_devstate(ASUS_WMI_DEVID_EGPU, enable, &result);
 	if (err) {
 		pr_warn("Failed to set egpu disable: %d\n", err);
-- 
2.40.1