[PATCH v11 17/18] HID: asus: report the XG Mobile GPU vendor to asus-wmi

[Denis Benato <denis.benato@linux.dev>]

The version query answers with the 4-part PCI ID of the GPU installed
in the station. Parse it, report its vendor part to asus-wmi as soon
as the station is identified and clear it when the station goes away,
so that enabling the eGPU through egpu_enable composes the right
activation value for NVIDIA, AMD and Intel stations alike.

Signed-off-by: Denis Benato <denis.benato@linux.dev>
---
 drivers/hid/hid-asus.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index e444cad85b32..244d103fbd4c 100644
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -186,6 +186,7 @@ struct asus_xgm_info {
 	char part_number[ASUS_XGM_INFO_LEN];
 	char firmware_version[ASUS_XGM_INFO_LEN];
 	char generation[ASUS_XGM_INFO_LEN];
+	u8 gpu_id[4];
 };
 
 struct asus_touchpad_info {
@@ -6313,6 +6314,12 @@ static int asus_xgm_get_version(struct hid_device *hdev,
 	asus_xgm_tlv_str(info->firmware_version, sizeof(info->firmware_version),
 			 buf, len, "VER");
 
+	/* the 4-part PCI ID of the GPU installed in the station: buf[3..10] */
+	if (len < 11)
+		return -ENODATA;
+
+	memcpy(info->gpu_id, buf + 3, sizeof(info->gpu_id));
+
 	return 0;
 }
 
@@ -6685,6 +6692,8 @@ static int asus_xgm_init(struct hid_device *hdev, struct asus_drvdata *drvdata)
 		hid_info(hdev, "XG Mobile: firmware %s, generation %s\n",
 			 info->firmware_version, info->generation);
 
+	asus_wmi_egpu_set_vendor(info->gpu_id[0]);
+
 	/*
 	 * The attribute group is not devm-managed: a creation failure is
 	 * fatal and unwound through asus_xgm_init_err, while on the unbind
@@ -6732,6 +6741,7 @@ static int asus_xgm_init(struct hid_device *hdev, struct asus_drvdata *drvdata)
 
 	return 0;
 asus_xgm_init_err:
+	asus_wmi_egpu_set_vendor(0);
 	sysfs_remove_group(&hdev->dev.kobj, &asus_xgm_attr_group);
 	drvdata->xgm_info = NULL;
 	drvdata->xgm_led = NULL;
@@ -6951,8 +6961,10 @@ static int asus_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	if (drvdata->listener.brightness_set)
 		asus_hid_unregister_listener(&drvdata->listener);
 
-	if (drvdata->xgm_info)
+	if (drvdata->xgm_info) {
+		asus_wmi_egpu_set_vendor(0);
 		sysfs_remove_group(&hdev->dev.kobj, &asus_xgm_attr_group);
+	}
 
 	if (drvdata->xgm_led)
 		devm_led_classdev_unregister(&hdev->dev, &drvdata->xgm_led->cdev);
@@ -6972,8 +6984,10 @@ static void asus_remove(struct hid_device *hdev)
 	if (drvdata->listener.brightness_set)
 		asus_hid_unregister_listener(&drvdata->listener);
 
-	if (drvdata->xgm_info)
+	if (drvdata->xgm_info) {
+		asus_wmi_egpu_set_vendor(0);
 		sysfs_remove_group(&hdev->dev.kobj, &asus_xgm_attr_group);
+	}
 
 	if (drvdata->xgm_led)
 		devm_led_classdev_unregister(&hdev->dev, &drvdata->xgm_led->cdev);
-- 
2.47.3