1 // SPDX-License-Identifier: GPL-2.0-only
4  * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
9  * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
10  * Copyright (c) 2003-2004 IBM Corp.
15 #include <linux/device.h>
48  * drm_connector_register() in case of hot-plugged connectors. Unregistration is
64 static bool drm_connector_acpi_bus_match(struct device *dev)  in drm_connector_acpi_bus_match()
66 	return dev->type == &drm_sysfs_device_connector;  in drm_connector_acpi_bus_match()
69 static struct acpi_device *drm_connector_acpi_find_companion(struct device *dev)  in drm_connector_acpi_find_companion()
73 	return to_acpi_device_node(connector->fwnode);  in drm_connector_acpi_find_companion()
96 static char *drm_devnode(const struct device *dev, umode_t *mode)  in drm_devnode()
101 static int typec_connector_bind(struct device *dev,  in typec_connector_bind()
102 				struct device *typec_connector, void *data)  in typec_connector_bind()
106 	ret = sysfs_create_link(&dev->kobj, &typec_connector->kobj, "typec_connector");  in typec_connector_bind()
110 	ret = sysfs_create_link(&typec_connector->kobj, &dev->kobj, "drm_connector");  in typec_connector_bind()
112 		sysfs_remove_link(&dev->kobj, "typec_connector");  in typec_connector_bind()
117 static void typec_connector_unbind(struct device *dev,  in typec_connector_unbind()
118 				   struct device *typec_connector, void *data)  in typec_connector_unbind()
120 	sysfs_remove_link(&typec_connector->kobj, "drm_connector");  in typec_connector_unbind()
121 	sysfs_remove_link(&dev->kobj, "typec_connector");  in typec_connector_unbind()
132  * drm_sysfs_init - initialize sysfs helpers
135  * other top-level DRM sysfs objects.
156 	drm_class->devnode = drm_devnode;  in drm_sysfs_init()
163  * drm_sysfs_destroy - destroys DRM class
165  * Destroy the DRM device class.
177 static void drm_sysfs_release(struct device *dev)  in drm_sysfs_release()
185 static ssize_t status_store(struct device *device,  in status_store()  argument
189 	struct drm_connector *connector = to_drm_connector(device);  in status_store()
190 	struct drm_device *dev = connector->dev;  in status_store()
194 	ret = mutex_lock_interruptible(&dev->mode_config.mutex);  in status_store()
198 	old_force = connector->force;  in status_store()
201 		connector->force = 0;  in status_store()
203 		connector->force = DRM_FORCE_ON;  in status_store()
204 	else if (sysfs_streq(buf, "on-digital"))  in status_store()
205 		connector->force = DRM_FORCE_ON_DIGITAL;  in status_store()
207 		connector->force = DRM_FORCE_OFF;  in status_store()
209 		ret = -EINVAL;  in status_store()
211 	if (old_force != connector->force || !connector->force) {  in status_store()
213 			    connector->base.id, connector->name,  in status_store()
214 			    old_force, connector->force);  in status_store()
216 		connector->funcs->fill_modes(connector,  in status_store()
217 					     dev->mode_config.max_width,  in status_store()
218 					     dev->mode_config.max_height);  in status_store()
221 	mutex_unlock(&dev->mode_config.mutex);  in status_store()
226 static ssize_t status_show(struct device *device,  in status_show()  argument
230 	struct drm_connector *connector = to_drm_connector(device);  in status_show()
233 	status = READ_ONCE(connector->status);  in status_show()
239 static ssize_t dpms_show(struct device *device,  in dpms_show()  argument
243 	struct drm_connector *connector = to_drm_connector(device);  in dpms_show()
246 	dpms = READ_ONCE(connector->dpms);  in dpms_show()
251 static ssize_t enabled_show(struct device *device,  in enabled_show()  argument
255 	struct drm_connector *connector = to_drm_connector(device);  in enabled_show()
258 	enabled = READ_ONCE(connector->encoder);  in enabled_show()
267 	struct device *connector_dev = kobj_to_dev(kobj);  in edid_show()
276 static ssize_t modes_show(struct device *device,  in modes_show()  argument
280 	struct drm_connector *connector = to_drm_connector(device);  in modes_show()
284 	mutex_lock(&connector->dev->mode_config.mutex);  in modes_show()
285 	list_for_each_entry(mode, &connector->modes, head) {  in modes_show()
286 		written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",  in modes_show()
287 				    mode->name);  in modes_show()
289 	mutex_unlock(&connector->dev->mode_config.mutex);  in modes_show()
294 static ssize_t connector_id_show(struct device *device,  in connector_id_show()  argument
298 	struct drm_connector *connector = to_drm_connector(device);  in connector_id_show()
300 	return sysfs_emit(buf, "%d\n", connector->base.id);  in connector_id_show()
342 	struct drm_device *dev = connector->dev;  in drm_sysfs_connector_add()
343 	struct device *kdev;  in drm_sysfs_connector_add()
346 	if (connector->kdev)  in drm_sysfs_connector_add()
351 		return -ENOMEM;  in drm_sysfs_connector_add()
354 	kdev->class = drm_class;  in drm_sysfs_connector_add()
355 	kdev->type = &drm_sysfs_device_connector;  in drm_sysfs_connector_add()
356 	kdev->parent = dev->primary->kdev;  in drm_sysfs_connector_add()
357 	kdev->groups = connector_dev_groups;  in drm_sysfs_connector_add()
358 	kdev->release = drm_sysfs_release;  in drm_sysfs_connector_add()
361 	r = dev_set_name(kdev, "card%d-%s", dev->primary->index, connector->name);  in drm_sysfs_connector_add()
366 		    connector->base.id, connector->name);  in drm_sysfs_connector_add()
370 		drm_err(dev, "failed to register connector device: %d\n", r);  in drm_sysfs_connector_add()
374 	connector->kdev = kdev;  in drm_sysfs_connector_add()
391 	if (connector->ddc)  in drm_sysfs_connector_add_late()
392 		return sysfs_create_link(&connector->kdev->kobj,  in drm_sysfs_connector_add_late()
393 					 &connector->ddc->dev.kobj, "ddc");  in drm_sysfs_connector_add_late()
400 	if (connector->ddc)  in drm_sysfs_connector_remove_early()
401 		sysfs_remove_link(&connector->kdev->kobj, "ddc");  in drm_sysfs_connector_remove_early()
406 	if (!connector->kdev)  in drm_sysfs_connector_remove()
409 	if (dev_fwnode(connector->kdev))  in drm_sysfs_connector_remove()
410 		component_del(connector->kdev, &typec_connector_ops);  in drm_sysfs_connector_remove()
412 	drm_dbg_kms(connector->dev,  in drm_sysfs_connector_remove()
414 		    connector->base.id, connector->name);  in drm_sysfs_connector_remove()
416 	device_unregister(connector->kdev);  in drm_sysfs_connector_remove()
417 	connector->kdev = NULL;  in drm_sysfs_connector_remove()
427 	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);  in drm_sysfs_lease_event()
431  * drm_sysfs_hotplug_event - generate a DRM uevent
432  * @dev: DRM device
434  * Send a uevent for the DRM device specified by @dev.  Currently we only
448 	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);  in drm_sysfs_hotplug_event()
453  * drm_sysfs_connector_hotplug_event - generate a DRM uevent for any connector
462 	struct drm_device *dev = connector->dev;  in drm_sysfs_connector_hotplug_event()
467 		 "CONNECTOR=%u", connector->base.id);  in drm_sysfs_connector_hotplug_event()
469 	drm_dbg_kms(connector->dev,  in drm_sysfs_connector_hotplug_event()
471 		    connector->base.id, connector->name);  in drm_sysfs_connector_hotplug_event()
473 	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);  in drm_sysfs_connector_hotplug_event()
478  * drm_sysfs_connector_property_event - generate a DRM uevent for connector
490 	struct drm_device *dev = connector->dev;  in drm_sysfs_connector_property_event()
494 	WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,  in drm_sysfs_connector_property_event()
495 					   property->base.id));  in drm_sysfs_connector_property_event()
498 		 "CONNECTOR=%u", connector->base.id);  in drm_sysfs_connector_property_event()
500 		 "PROPERTY=%u", property->base.id);  in drm_sysfs_connector_property_event()
502 	drm_dbg_kms(connector->dev,  in drm_sysfs_connector_property_event()
504 		    connector->base.id, connector->name,  in drm_sysfs_connector_property_event()
505 		    property->base.id, property->name);  in drm_sysfs_connector_property_event()
507 	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);  in drm_sysfs_connector_property_event()
511 struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)  in drm_sysfs_minor_alloc()
514 	struct device *kdev;  in drm_sysfs_minor_alloc()
519 		return ERR_PTR(-ENOMEM);  in drm_sysfs_minor_alloc()
523 	if (minor->type == DRM_MINOR_ACCEL) {  in drm_sysfs_minor_alloc()
525 		accel_set_device_instance_params(kdev, minor->index);  in drm_sysfs_minor_alloc()
527 		if (minor->type == DRM_MINOR_RENDER)  in drm_sysfs_minor_alloc()
532 		kdev->devt = MKDEV(DRM_MAJOR, minor->index);  in drm_sysfs_minor_alloc()
533 		kdev->class = drm_class;  in drm_sysfs_minor_alloc()
534 		kdev->type = &drm_sysfs_device_minor;  in drm_sysfs_minor_alloc()
537 	kdev->parent = minor->dev->dev;  in drm_sysfs_minor_alloc()
538 	kdev->release = drm_sysfs_release;  in drm_sysfs_minor_alloc()
541 	r = dev_set_name(kdev, minor_str, minor->index);  in drm_sysfs_minor_alloc()
553  * drm_class_device_register - register new device with the DRM sysfs class
554  * @dev: device to register
556  * Registers a new &struct device within the DRM sysfs class. Essentially only
560 int drm_class_device_register(struct device *dev)  in drm_class_device_register()
563 		return -ENOENT;  in drm_class_device_register()
565 	dev->class = drm_class;  in drm_class_device_register()
571  * drm_class_device_unregister - unregister device with the DRM sysfs class
572  * @dev: device to unregister
574  * Unregisters a &struct device from the DRM sysfs class. Essentially only used
578 void drm_class_device_unregister(struct device *dev)  in drm_class_device_unregister()