[PATCH v3 09/10] drm: uevent for connector status change

Ramalingam C
2019-03-22T00:44:47Z

DRM API for generating uevent for a status changes of connector's
property.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
drivers/gpu/drm/drm_sysfs.c | 28 ++++++++++++++++++++++++++++
include/drm/drm_sysfs.h | 5 ++++-
2 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index ecb7b33002bb..c76c65ca4122 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -330,6 +330,34 @@ void drm_sysfs_hotplug_event(struct drm_device *dev)
}
EXPORT_SYMBOL(drm_sysfs_hotplug_event);

+/**
+ * drm_sysfs_connector_status_event - generate a DRM uevent for connector
+ * property status change
+ * @connector: connector on which property status changed
+ * @property: connector property whoes status changed.
+ *
+ * Send a uevent for the DRM device specified by @dev. Currently we
+ * set HOTPLUG=1 and connector id along with it property id related to status
+ * changed.
+ */
+void drm_sysfs_connector_status_event(struct drm_connector *connector,
+ struct drm_property *property)
+{
+ struct drm_device *dev = connector->dev;
+ char hotplug_str[] = "HOTPLUG=1", conn_id[30], prop_id[30];
+ char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
+
+ snprintf(conn_id, ARRAY_SIZE(conn_id),
+ "CONNECTOR=%u", connector->base.id);
+ snprintf(prop_id, ARRAY_SIZE(prop_id),
+ "PROPERTY=%u", property->base.id);
+
+ DRM_DEBUG("generating connector status event\n");
+
+ kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
+}
+EXPORT_SYMBOL(drm_sysfs_connector_status_event);
+
static void drm_sysfs_release(struct device *dev)
{
kfree(dev);
diff --git a/include/drm/drm_sysfs.h b/include/drm/drm_sysfs.h
index 4f311e836cdc..d454ef617b2c 100644
--- a/include/drm/drm_sysfs.h
+++ b/include/drm/drm_sysfs.h
@@ -4,10 +4,13 @@

struct drm_device;
struct device;
+struct drm_connector;
+struct drm_property;

int drm_class_device_register(struct device *dev);
void drm_class_device_unregister(struct device *dev);

void drm_sysfs_hotplug_event(struct drm_device *dev);
-
+void drm_sysfs_connector_status_event(struct drm_connector *connector,
+ struct drm_property *property);
#endif
--
2.19.1