[v5,08/12] drm: uevent for connector status change

Submitted by Ramalingam C on April 18, 2019, 8:58 a.m.

Details

Message ID 20190418085805.5648-9-ramalingam.c@intel.com
State New
Headers show
Series "HDCP2.2 Phase II" ( rev: 7 6 ) in Intel GFX

Not browsing as part of any series.

Commit Message

Ramalingam C April 18, 2019, 8:58 a.m.
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@intel.com>
---
 drivers/gpu/drm/drm_sysfs.c | 31 +++++++++++++++++++++++++++++++
 include/drm/drm_sysfs.h     |  5 ++++-
 2 files changed, 35 insertions(+), 1 deletion(-)

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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

Comments

On Thu, Apr 18, 2019 at 02:28:01PM +0530, Ramalingam C wrote:
> 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@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);

Maybe double-check that property is attached to connector, and WARN if
not? Just to catch mistakes in driver programming.

With that: Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>


> +
> +	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
>