On Wed, 09 Jun 2021, Simon Ser <cont...@emersion.fr> wrote:
> This function sends a hotplug uevent with a CONNECTOR property.
>
> Signed-off-by: Simon Ser <cont...@emersion.fr>
> ---
> drivers/gpu/drm/drm_sysfs.c | 25 +++++++++++++++++++++++++
> include/drm/drm_sysfs.h | 1 +
> 2 files changed, 26 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
> index 968a9560b4aa..6b52a53c0c3e 100644
> --- a/drivers/gpu/drm/drm_sysfs.c
> +++ b/drivers/gpu/drm/drm_sysfs.c
> @@ -343,6 +343,31 @@ void drm_sysfs_hotplug_event(struct drm_device *dev)
> }
> EXPORT_SYMBOL(drm_sysfs_hotplug_event);
>
> +/**
> + * drm_sysfs_connector_hotplug_event - generate a DRM uevent for any
> connector
> + * change
> + * @connector: connector which has changed
> + *
> + * Send a uevent for the DRM connector specified by @connector. This will
> send
> + * a uevent with the properties HOTPLUG=1 and CONNECTOR.
> + */
> +void drm_sysfs_connector_hotplug_event(struct drm_connector *connector)
> +{
> + struct drm_device *dev = connector->dev;
> + char hotplug_str[] = "HOTPLUG=1", conn_id[21];
> + char *envp[] = { hotplug_str, conn_id, NULL };
> +
> + snprintf(conn_id, ARRAY_SIZE(conn_id),
Semantically should be sizeof(conn_id) though the result is the same. (I
guess this is copy-paste from drm_sysfs_connector_status_event().)
> + "CONNECTOR=%u", connector->base.id);
> +
> + drm_dbg(connector->dev,
drm_dbg_kms?
> + "generating hotplug event for [CONNECTOR:%d:%s]\n",
> + connector->base.id, connector->name);
A matter of taste, but seems like in a lot of places we tend to stick
the [CONNECTOR:%d:%s] at the beginning of the string. So if you have
back-to-back messages related to the same connector, they get aligned
and are easy to spot.
BR,
Jani.
> +
> + kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
> +}
> +EXPORT_SYMBOL(drm_sysfs_connector_hotplug_event);
> +
> /**
> * drm_sysfs_connector_status_event - generate a DRM uevent for connector
> * property status change
> diff --git a/include/drm/drm_sysfs.h b/include/drm/drm_sysfs.h
> index d454ef617b2c..6273cac44e47 100644
> --- a/include/drm/drm_sysfs.h
> +++ b/include/drm/drm_sysfs.h
> @@ -11,6 +11,7 @@ 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_hotplug_event(struct drm_connector *connector);
> void drm_sysfs_connector_status_event(struct drm_connector *connector,
> struct drm_property *property);
> #endif
--
Jani Nikula, Intel Open Source Graphics Center
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