[Intel-gfx] [PATCH v3 09/10] drm: uevent for connector status change

[Ramalingam C]

On 2019-03-27 at 12:01:37 +0100, Daniel Vetter wrote:
> On Fri, Mar 22, 2019 at 06:14:47AM +0530, Ramalingam C wrote:
> > DRM API for generating uevent for a status changes of connector's
> > property.
> > 
> > Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
> > ---
> >  drivers/gpu/drm/drm_sysfs.c | 28 ++++++++++++++++++++++++++++
> >  include/drm/drm_sysfs.h     |  5 ++++-
> >  2 files changed, 32 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
> > index ecb7b33002bb..c76c65ca4122 100644
> > --- a/drivers/gpu/drm/drm_sysfs.c
> > +++ b/drivers/gpu/drm/drm_sysfs.c
> > @@ -330,6 +330,34 @@ void drm_sysfs_hotplug_event(struct drm_device *dev)
> >  }
> >  EXPORT_SYMBOL(drm_sysfs_hotplug_event);
> 
> Maybe add a comment to the kerneldoc of drm_sysfs_hotplug_event() that new
> uapi should use drm_sysfs_connector_status_event().
Sure.

-Ram
> -Daniel
> 
> >  
> > +/**
> > + * 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 it property id related to status
> > + * changed.
> > + */
> > +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
> > -- 
> > 2.19.1
> > 
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch