linux-kernel - [PATCH RFC v3 11/14] drm/vkms: Introduce configfs for connector status

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Message-Id: <20250121-google-config-fs-v3-11-8154a6945142@bootlin.com>
Date: Tue, 21 Jan 2025 15:34:55 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>, 
 Melissa Wen <melissa.srw@...il.com>, 
 Maíra Canal <mairacanal@...eup.net>, 
 Haneen Mohammed <hamohammed.sa@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Simona Vetter <simona.vetter@...ll.ch>
Cc: jose.exposito89@...il.com, dri-devel@...ts.freedesktop.org, 
 arthurgrillo@...eup.net, linux-kernel@...r.kernel.org, 
 jeremie.dautheribes@...tlin.com, miquel.raynal@...tlin.com, 
 thomas.petazzoni@...tlin.com, seanpaul@...gle.com, nicolejadeyee@...gle.com, 
 Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH RFC v3 11/14] drm/vkms: Introduce configfs for connector
 status

As a connector can be connected and disconnected once a device is created,
create a file to allow changing this status.

Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 drivers/gpu/drm/vkms/vkms_configfs.c | 45 ++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c
index d0bc6adfdae85b82ca043d318f84fca70840526c..09d9ac3cb3e25e980473686b7b0d2e66e78cf163 100644
--- a/drivers/gpu/drm/vkms/vkms_configfs.c
+++ b/drivers/gpu/drm/vkms/vkms_configfs.c
@@ -771,10 +771,55 @@ static ssize_t connector_type_store(struct config_item *item,
 	return count;
 }
 
+static ssize_t connector_status_show(struct config_item *item, char *page)
+{
+	struct vkms_config_connector *connector;
+	enum drm_connector_status status;
+	struct vkms_configfs_device *vkms_configfs = connector_child_item_to_vkms_configfs_device(item);
+
+	mutex_lock(&vkms_configfs->lock);
+	connector = connector_item_to_vkms_configfs_connector(item)->vkms_config_connector;
+	status = connector->status;
+	mutex_unlock(&vkms_configfs->lock);
+
+	return sprintf(page, "%u", status);
+}
+
+static ssize_t connector_status_store(struct config_item *item,
+				      const char *page, size_t count)
+{
+	struct vkms_config_connector *connector;
+	enum drm_connector_status status = connector_status_unknown;
+	struct vkms_configfs_device *vkms_configfs = connector_child_item_to_vkms_configfs_device(item);
+	int ret;
+
+	ret = kstrtouint(page, 10, &status);
+	if (ret)
+		return ret;
+
+	switch (status) {
+	case connector_status_unknown:
+	case connector_status_connected:
+	case connector_status_disconnected:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	scoped_guard(mutex, &vkms_configfs->lock) {
+		connector = connector_item_to_vkms_configfs_connector(item)->vkms_config_connector;
+		vkms_config_connector_update_status(connector, status);
+	}
+
+	return count;
+}
+
 CONFIGFS_ATTR(connector_, type);
+CONFIGFS_ATTR(connector_, status);
 
 static struct configfs_attribute *connector_attrs[] = {
 	&connector_attr_type,
+	&connector_attr_status,
 	NULL,
 };
 

-- 
2.47.1