3 * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
4 * extra sysfs attribute from DRM. Normal drm_sysfs_class
5 * does not allow adding attributes.
7 * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
8 * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
9 * Copyright (c) 2003-2004 IBM Corp.
11 * This file is released under the GPLv2
15 #include <linux/device.h>
16 #include <linux/kdev_t.h>
17 #include <linux/gfp.h>
18 #include <linux/err.h>
19 #include <linux/export.h>
21 #include <drm/drm_sysfs.h>
22 #include <drm/drm_core.h>
25 #define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
26 #define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
28 static struct device_type drm_sysfs_device_minor = {
33 * drm_class_suspend - DRM class suspend hook
34 * @dev: Linux device to suspend
35 * @state: power state to enter
37 * Just figures out what the actual struct drm_device associated with
38 * @dev is and calls its suspend hook, if present.
40 static int drm_class_suspend(struct device *dev, pm_message_t state)
42 if (dev->type == &drm_sysfs_device_minor) {
43 struct drm_minor *drm_minor = to_drm_minor(dev);
44 struct drm_device *drm_dev = drm_minor->dev;
46 if (drm_minor->type == DRM_MINOR_LEGACY &&
47 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
48 drm_dev->driver->suspend)
49 return drm_dev->driver->suspend(drm_dev, state);
55 * drm_class_resume - DRM class resume hook
56 * @dev: Linux device to resume
58 * Just figures out what the actual struct drm_device associated with
59 * @dev is and calls its resume hook, if present.
61 static int drm_class_resume(struct device *dev)
63 if (dev->type == &drm_sysfs_device_minor) {
64 struct drm_minor *drm_minor = to_drm_minor(dev);
65 struct drm_device *drm_dev = drm_minor->dev;
67 if (drm_minor->type == DRM_MINOR_LEGACY &&
68 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
69 drm_dev->driver->resume)
70 return drm_dev->driver->resume(drm_dev);
75 static char *drm_devnode(struct device *dev, umode_t *mode)
77 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
80 static CLASS_ATTR_STRING(version, S_IRUGO,
82 __stringify(CORE_MAJOR) "."
83 __stringify(CORE_MINOR) "."
84 __stringify(CORE_PATCHLEVEL) " "
88 * drm_sysfs_create - create a struct drm_sysfs_class structure
89 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
90 * @name: pointer to a string for the name of this class.
92 * This is used to create DRM class pointer that can then be used
93 * in calls to drm_sysfs_device_add().
95 * Note, the pointer created here is to be destroyed when finished by making a
96 * call to drm_sysfs_destroy().
98 struct class *drm_sysfs_create(struct module *owner, char *name)
103 class = class_create(owner, name);
105 err = PTR_ERR(class);
109 class->suspend = drm_class_suspend;
110 class->resume = drm_class_resume;
112 err = class_create_file(class, &class_attr_version.attr);
116 class->devnode = drm_devnode;
121 class_destroy(class);
127 * drm_sysfs_destroy - destroys DRM class
129 * Destroy the DRM device class.
131 void drm_sysfs_destroy(void)
133 if ((drm_class == NULL) || (IS_ERR(drm_class)))
135 class_remove_file(drm_class, &class_attr_version.attr);
136 class_destroy(drm_class);
141 * drm_sysfs_device_release - do nothing
144 * Normally, this would free the DRM device associated with @dev, along
145 * with cleaning up any other stuff. But we do that in the DRM core, so
146 * this function can just return and hope that the core does its job.
148 static void drm_sysfs_device_release(struct device *dev)
150 memset(dev, 0, sizeof(struct device));
155 * Connector properties
157 static ssize_t status_show(struct device *device,
158 struct device_attribute *attr,
161 struct drm_connector *connector = to_drm_connector(device);
162 enum drm_connector_status status;
165 ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
169 status = connector->funcs->detect(connector, true);
170 mutex_unlock(&connector->dev->mode_config.mutex);
172 return snprintf(buf, PAGE_SIZE, "%s\n",
173 drm_get_connector_status_name(status));
176 static ssize_t dpms_show(struct device *device,
177 struct device_attribute *attr,
180 struct drm_connector *connector = to_drm_connector(device);
181 struct drm_device *dev = connector->dev;
182 uint64_t dpms_status;
185 ret = drm_object_property_get_value(&connector->base,
186 dev->mode_config.dpms_property,
191 return snprintf(buf, PAGE_SIZE, "%s\n",
192 drm_get_dpms_name((int)dpms_status));
195 static ssize_t enabled_show(struct device *device,
196 struct device_attribute *attr,
199 struct drm_connector *connector = to_drm_connector(device);
201 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
205 static ssize_t edid_show(struct file *filp, struct kobject *kobj,
206 struct bin_attribute *attr, char *buf, loff_t off,
209 struct device *connector_dev = container_of(kobj, struct device, kobj);
210 struct drm_connector *connector = to_drm_connector(connector_dev);
214 if (!connector->edid_blob_ptr)
217 edid = connector->edid_blob_ptr->data;
218 size = connector->edid_blob_ptr->length;
225 if (off + count > size)
227 memcpy(buf, edid + off, count);
232 static ssize_t modes_show(struct device *device,
233 struct device_attribute *attr,
236 struct drm_connector *connector = to_drm_connector(device);
237 struct drm_display_mode *mode;
240 list_for_each_entry(mode, &connector->modes, head) {
241 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
248 static ssize_t subconnector_show(struct device *device,
249 struct device_attribute *attr,
252 struct drm_connector *connector = to_drm_connector(device);
253 struct drm_device *dev = connector->dev;
254 struct drm_property *prop = NULL;
255 uint64_t subconnector;
259 switch (connector->connector_type) {
260 case DRM_MODE_CONNECTOR_DVII:
261 prop = dev->mode_config.dvi_i_subconnector_property;
263 case DRM_MODE_CONNECTOR_Composite:
264 case DRM_MODE_CONNECTOR_SVIDEO:
265 case DRM_MODE_CONNECTOR_Component:
266 case DRM_MODE_CONNECTOR_TV:
267 prop = dev->mode_config.tv_subconnector_property;
271 DRM_ERROR("Wrong connector type for this property\n");
276 DRM_ERROR("Unable to find subconnector property\n");
280 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
284 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
285 drm_get_tv_subconnector_name((int)subconnector) :
286 drm_get_dvi_i_subconnector_name((int)subconnector));
289 static ssize_t select_subconnector_show(struct device *device,
290 struct device_attribute *attr,
293 struct drm_connector *connector = to_drm_connector(device);
294 struct drm_device *dev = connector->dev;
295 struct drm_property *prop = NULL;
296 uint64_t subconnector;
300 switch (connector->connector_type) {
301 case DRM_MODE_CONNECTOR_DVII:
302 prop = dev->mode_config.dvi_i_select_subconnector_property;
304 case DRM_MODE_CONNECTOR_Composite:
305 case DRM_MODE_CONNECTOR_SVIDEO:
306 case DRM_MODE_CONNECTOR_Component:
307 case DRM_MODE_CONNECTOR_TV:
308 prop = dev->mode_config.tv_select_subconnector_property;
312 DRM_ERROR("Wrong connector type for this property\n");
317 DRM_ERROR("Unable to find select subconnector property\n");
321 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
325 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
326 drm_get_tv_select_name((int)subconnector) :
327 drm_get_dvi_i_select_name((int)subconnector));
330 static struct device_attribute connector_attrs[] = {
337 /* These attributes are for both DVI-I connectors and all types of tv-out. */
338 static struct device_attribute connector_attrs_opt1[] = {
339 __ATTR_RO(subconnector),
340 __ATTR_RO(select_subconnector),
343 static struct bin_attribute edid_attr = {
351 * drm_sysfs_connector_add - add a connector to sysfs
352 * @connector: connector to add
354 * Create a connector device in sysfs, along with its associated connector
355 * properties (so far, connection status, dpms, mode list & edid) and
356 * generate a hotplug event so userspace knows there's a new connector
360 * This routine should only be called *once* for each registered connector.
361 * A second call for an already registered connector will trigger the BUG_ON
364 int drm_sysfs_connector_add(struct drm_connector *connector)
366 struct drm_device *dev = connector->dev;
372 /* We shouldn't get called more than once for the same connector */
373 BUG_ON(device_is_registered(&connector->kdev));
375 connector->kdev.parent = &dev->primary->kdev;
376 connector->kdev.class = drm_class;
377 connector->kdev.release = drm_sysfs_device_release;
379 DRM_DEBUG("adding \"%s\" to sysfs\n",
380 drm_get_connector_name(connector));
382 dev_set_name(&connector->kdev, "card%d-%s",
383 dev->primary->index, drm_get_connector_name(connector));
384 ret = device_register(&connector->kdev);
387 DRM_ERROR("failed to register connector device: %d\n", ret);
391 /* Standard attributes */
393 for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
394 ret = device_create_file(&connector->kdev, &connector_attrs[attr_cnt]);
399 /* Optional attributes */
401 * In the long run it maybe a good idea to make one set of
402 * optionals per connector type.
404 switch (connector->connector_type) {
405 case DRM_MODE_CONNECTOR_DVII:
406 case DRM_MODE_CONNECTOR_Composite:
407 case DRM_MODE_CONNECTOR_SVIDEO:
408 case DRM_MODE_CONNECTOR_Component:
409 case DRM_MODE_CONNECTOR_TV:
410 for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
411 ret = device_create_file(&connector->kdev, &connector_attrs_opt1[opt_cnt]);
420 ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
424 /* Let userspace know we have a new connector */
425 drm_sysfs_hotplug_event(dev);
430 for (i = 0; i < opt_cnt; i++)
431 device_remove_file(&connector->kdev, &connector_attrs_opt1[i]);
432 for (i = 0; i < attr_cnt; i++)
433 device_remove_file(&connector->kdev, &connector_attrs[i]);
434 device_unregister(&connector->kdev);
439 EXPORT_SYMBOL(drm_sysfs_connector_add);
442 * drm_sysfs_connector_remove - remove an connector device from sysfs
443 * @connector: connector to remove
445 * Remove @connector and its associated attributes from sysfs. Note that
446 * the device model core will take care of sending the "remove" uevent
447 * at this time, so we don't need to do it.
450 * This routine should only be called if the connector was previously
451 * successfully registered. If @connector hasn't been registered yet,
452 * you'll likely see a panic somewhere deep in sysfs code when called.
454 void drm_sysfs_connector_remove(struct drm_connector *connector)
458 if (!connector->kdev.parent)
460 DRM_DEBUG("removing \"%s\" from sysfs\n",
461 drm_get_connector_name(connector));
463 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
464 device_remove_file(&connector->kdev, &connector_attrs[i]);
465 sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
466 device_unregister(&connector->kdev);
467 connector->kdev.parent = NULL;
469 EXPORT_SYMBOL(drm_sysfs_connector_remove);
472 * drm_sysfs_hotplug_event - generate a DRM uevent
475 * Send a uevent for the DRM device specified by @dev. Currently we only
476 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
477 * deal with other types of events.
479 void drm_sysfs_hotplug_event(struct drm_device *dev)
481 char *event_string = "HOTPLUG=1";
482 char *envp[] = { event_string, NULL };
484 DRM_DEBUG("generating hotplug event\n");
486 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
488 EXPORT_SYMBOL(drm_sysfs_hotplug_event);
491 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
492 * @dev: DRM device to be added
493 * @head: DRM head in question
495 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
496 * as the parent for the Linux device, and make sure it has a file containing
497 * the driver we're using (for userspace compatibility).
499 int drm_sysfs_device_add(struct drm_minor *minor)
504 minor->kdev.parent = minor->dev->dev;
506 minor->kdev.class = drm_class;
507 minor->kdev.release = drm_sysfs_device_release;
508 minor->kdev.devt = minor->device;
509 minor->kdev.type = &drm_sysfs_device_minor;
510 if (minor->type == DRM_MINOR_CONTROL)
511 minor_str = "controlD%d";
512 else if (minor->type == DRM_MINOR_RENDER)
513 minor_str = "renderD%d";
515 minor_str = "card%d";
517 dev_set_name(&minor->kdev, minor_str, minor->index);
519 err = device_register(&minor->kdev);
521 DRM_ERROR("device add failed: %d\n", err);
532 * drm_sysfs_device_remove - remove DRM device
533 * @dev: DRM device to remove
535 * This call unregisters and cleans up a class device that was created with a
536 * call to drm_sysfs_device_add()
538 void drm_sysfs_device_remove(struct drm_minor *minor)
540 if (minor->kdev.parent)
541 device_unregister(&minor->kdev);
542 minor->kdev.parent = NULL;
547 * drm_class_device_register - Register a struct device in the drm class.
549 * @dev: pointer to struct device to register.
551 * @dev should have all relevant members pre-filled with the exception
552 * of the class member. In particular, the device_type member must
556 int drm_class_device_register(struct device *dev)
558 if (!drm_class || IS_ERR(drm_class))
561 dev->class = drm_class;
562 return device_register(dev);
564 EXPORT_SYMBOL_GPL(drm_class_device_register);
566 void drm_class_device_unregister(struct device *dev)
568 return device_unregister(dev);
570 EXPORT_SYMBOL_GPL(drm_class_device_unregister);