[PATCH v4 27/37] drm/vkms: Introduce configfs for connector type

[Louis Chauvet <louis.chauvet@bootlin.com>]

Add a new attribute to connector to change its type. This is mostly
cosmetic and don't have direct effect in VKMS behavior.

Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
---
 Documentation/ABI/testing/configfs-vkms |  7 ++++
 Documentation/gpu/vkms.rst              |  3 +-
 drivers/gpu/drm/vkms/vkms_configfs.c    | 65 +++++++++++++++++++++++++++++++++
 3 files changed, 74 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/configfs-vkms b/Documentation/ABI/testing/configfs-vkms
index 9f77a878aeef..7f0dd0789f0a 100644
--- a/Documentation/ABI/testing/configfs-vkms
+++ b/Documentation/ABI/testing/configfs-vkms
@@ -33,6 +33,13 @@ Description:
 	Connection status of the connector. Possible values:
 	1 - connected, 2 - disconnected, 3 - unknown.
 
+What:		/sys/kernel/config/vkms/<device>/connectors/<connector>/type
+Date:		Nov 2025
+Contact:	dri-devel@lists.freedesktop.org
+Description:
+	Type of the connector. Possible values match those
+	exposed by the "type" field in drm_connector.
+
 What:		/sys/kernel/config/vkms/<device>/connectors/<connector>/possible_encoders
 Date:		Nov 2025
 Contact:	dri-devel@lists.freedesktop.org
diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst
index c811290af983..db86a956e137 100644
--- a/Documentation/gpu/vkms.rst
+++ b/Documentation/gpu/vkms.rst
@@ -138,10 +138,11 @@ Last but not least, create one or more connectors::
 
   sudo mkdir /config/vkms/my-vkms/connectors/connector0
 
-Connectors have 1 configurable attribute:
+Connectors have 2 configurable attribute:
 
 - status: Connection status: 1 connected, 2 disconnected, 3 unknown (same values
   as those exposed by the "status" property of a connector)
+- type: Type of connector. Same values as exposed by the "type" field in drm_connector.
 
 To finish the configuration, link the different pipeline items::
 
diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c
index 832f73011353..a0b3347b2bd8 100644
--- a/drivers/gpu/drm/vkms/vkms_configfs.c
+++ b/drivers/gpu/drm/vkms/vkms_configfs.c
@@ -1173,10 +1173,75 @@ static ssize_t connector_status_store(struct config_item *item,
 	return (ssize_t)count;
 }
 
+static ssize_t connector_type_show(struct config_item *item, char *page)
+{
+	struct vkms_configfs_connector *connector;
+	int type;
+
+	connector = connector_item_to_vkms_configfs_connector(item);
+
+	scoped_guard(mutex, &connector->dev->lock) {
+		type = vkms_config_connector_get_type(connector->config);
+	}
+
+	return sprintf(page, "%u", type);
+}
+
+static ssize_t connector_type_store(struct config_item *item,
+				    const char *page, size_t count)
+{
+	struct vkms_configfs_connector *connector;
+	int val, ret;
+
+	connector = connector_item_to_vkms_configfs_connector(item);
+
+	ret = kstrtouint(page, 10, &val);
+
+	if (ret)
+		return ret;
+
+	switch (val) {
+	case DRM_MODE_CONNECTOR_Unknown:
+	case DRM_MODE_CONNECTOR_VGA:
+	case DRM_MODE_CONNECTOR_DVII:
+	case DRM_MODE_CONNECTOR_DVID:
+	case DRM_MODE_CONNECTOR_DVIA:
+	case DRM_MODE_CONNECTOR_Composite:
+	case DRM_MODE_CONNECTOR_SVIDEO:
+	case DRM_MODE_CONNECTOR_LVDS:
+	case DRM_MODE_CONNECTOR_Component:
+	case DRM_MODE_CONNECTOR_9PinDIN:
+	case DRM_MODE_CONNECTOR_DisplayPort:
+	case DRM_MODE_CONNECTOR_HDMIA:
+	case DRM_MODE_CONNECTOR_HDMIB:
+	case DRM_MODE_CONNECTOR_TV:
+	case DRM_MODE_CONNECTOR_eDP:
+	case DRM_MODE_CONNECTOR_VIRTUAL:
+	case DRM_MODE_CONNECTOR_DSI:
+	case DRM_MODE_CONNECTOR_DPI:
+	case DRM_MODE_CONNECTOR_SPI:
+	case DRM_MODE_CONNECTOR_USB:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	scoped_guard(mutex, &connector->dev->lock) {
+		if (connector->dev->enabled)
+			return -EBUSY;
+
+		vkms_config_connector_set_type(connector->config, val);
+	}
+
+	return count;
+}
+
 CONFIGFS_ATTR(connector_, status);
+CONFIGFS_ATTR(connector_, type);
 
 static struct configfs_attribute *connector_item_attrs[] = {
 	&connector_attr_status,
+	&connector_attr_type,
 	NULL,
 };
 

-- 
2.54.0