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@xxxxxxxxx>
> ---
> 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@xxxxxxxx>
> +
> + 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
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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