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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: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sean Paul <sean@poorly.run>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/320961/?series=57232&rev=14
This commit is contained in:
Ramalingam C 2019-08-01 17:11:16 +05:30
parent d456512c39
commit 6fe2ce0649
2 changed files with 39 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/gpu/drm/drm_sysfs.c
View File

@ -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);

5
include/drm/drm_sysfs.h
View File

@ -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