[PATCH v4 09/13] drm: uevent for connector status change
Ramalingam C
ramalingam.c at intel.com
Fri Apr 5 08:42:58 UTC 2019
DRM API for generating uevent for a status changes of connector's
property.
This uevent will have following details related to the status change:
HOTPLUG=1, CONNECTOR=<connector_id> and PROPERTY=<property_id>
v2:
Minor fixes at KDoc comments [Daniel]
Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
drivers/gpu/drm/drm_sysfs.c | 31 +++++++++++++++++++++++++++++++
include/drm/drm_sysfs.h | 5 ++++-
2 files changed, 35 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index 18b1ac442997..e8f1fd73677f 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -320,6 +320,9 @@ void drm_sysfs_lease_event(struct drm_device *dev)
* Send a uevent for the DRM device specified by @dev. Currently we only
* set HOTPLUG=1 in the uevent environment, but this could be expanded to
* deal with other types of events.
+ *
+ * Any new uapi should be using the drm_sysfs_connector_status_event()
+ * for uevents on connector status change.
*/
void drm_sysfs_hotplug_event(struct drm_device *dev)
{
@@ -332,6 +335,34 @@ 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 the attached property id
+ * related to the status change.
+ */
+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
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