[modeseting-101] add connected field to sysfs

diff --git a/linux-core/drm_sysfs.c b/linux-core/drm_sysfs.c
index 92371c2..02b0853 100644 (file)
--- a/linux-core/drm_sysfs.c
+++ b/linux-core/drm_sysfs.c
@@ -176,6 +176,19 @@ static ssize_t dpms_show(struct device *device,
        return snprintf(buf, PAGE_SIZE, "%s", drm_get_dpms_name((int)dpms_status));
 }
 
+static ssize_t connected_show(struct device *device,
+                          struct device_attribute *attr,
+                          char *buf)
+{
+       struct drm_connector *connector = container_of(device, struct drm_connector, kdev);
+       struct drm_device *dev = connector->dev;
+
+       if (connector->encoder)
+               return snprintf(buf, PAGE_SIZE, "connected");
+       else
+               return snprintf(buf, PAGE_SIZE, "disconnected");
+}
+
 static ssize_t edid_show(struct kobject *kobj, struct bin_attribute *attr,
                         char *buf, loff_t off, size_t count)
 {
@@ -221,6 +234,7 @@ static ssize_t modes_show(struct device *device,
 
 static struct device_attribute connector_attrs[] = {
        __ATTR_RO(status),
+       __ATTR_RO(connected),
        __ATTR_RO(dpms),
        __ATTR_RO(modes),
 };