Commit 6fe2ce06 authored by Ramalingam C's avatar Ramalingam C
Browse files

drm: uevent for connector status change 

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>

Pekka have completed the Weston DRM-backend review in
https://gitlab.freedesktop.org/wayland/weston/merge_requests/48


and the UAPI for HDCP 2.2 looks good.

The userspace is accepted in Weston.

v2:
  Minor fixes at KDoc comments [Daniel]
v3:
  Check the property is really attached with connector [Daniel]
v4:
  Typos and string length suggestions are addressed [Sean]

Signed-off-by: default avatarRamalingam C <ramalingam.c@intel.com>
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: default avatarSean Paul <sean@poorly.run>
Acked-by: default avatarPekka Paalanen <pekka.paalanen@collabora.com>
Acked-by: default avatarJani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/320961/?series=57232&rev=14
parent d456512c

drivers/gpu/drm/drm_sysfs.c

+35 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#include <drm/drm_sysfs.h>



#include "drm_internal.h"

#include "drm_crtc_internal.h"



#define to_drm_minor(d) dev_get_drvdata(d)

#define to_drm_connector(d) dev_get_drvdata(d)
@@ -333,6 +334,9 @@ 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)

{
@@ -345,6 +349,37 @@ 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 whose 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[21], prop_id[21];

	char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };



	WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,

					   property->base.id));



	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);

include/drm/drm_sysfs.h

+4 −1
Original line number Diff line number Diff line
@@ -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

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