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) dev_get_drvdata(d)
26 #define to_drm_connector(d) dev_get_drvdata(d)
28 static struct device_type drm_sysfs_device_minor = {
33 * __drm_class_suspend - internal DRM class suspend routine
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_suspend - internal DRM class suspend hook. Simply calls
56 * __drm_class_suspend() with the correct pm state.
57 * @dev: Linux device to suspend
59 static int drm_class_suspend(struct device *dev)
61 return __drm_class_suspend(dev, PMSG_SUSPEND);
65 * drm_class_freeze - internal DRM class freeze hook. Simply calls
66 * __drm_class_suspend() with the correct pm state.
67 * @dev: Linux device to freeze
69 static int drm_class_freeze(struct device *dev)
71 return __drm_class_suspend(dev, PMSG_FREEZE);
75 * drm_class_resume - DRM class resume hook
76 * @dev: Linux device to resume
78 * Just figures out what the actual struct drm_device associated with
79 * @dev is and calls its resume hook, if present.
81 static int drm_class_resume(struct device *dev)
83 if (dev->type == &drm_sysfs_device_minor) {
84 struct drm_minor *drm_minor = to_drm_minor(dev);
85 struct drm_device *drm_dev = drm_minor->dev;
87 if (drm_minor->type == DRM_MINOR_LEGACY &&
88 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
89 drm_dev->driver->resume)
90 return drm_dev->driver->resume(drm_dev);
95 static const struct dev_pm_ops drm_class_dev_pm_ops = {
96 .suspend = drm_class_suspend,
97 .resume = drm_class_resume,
98 .freeze = drm_class_freeze,
101 static char *drm_devnode(struct device *dev, umode_t *mode)
103 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
106 static CLASS_ATTR_STRING(version, S_IRUGO,
108 __stringify(CORE_MAJOR) "."
109 __stringify(CORE_MINOR) "."
110 __stringify(CORE_PATCHLEVEL) " "
114 * drm_sysfs_create - create a struct drm_sysfs_class structure
115 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
116 * @name: pointer to a string for the name of this class.
118 * This is used to create DRM class pointer that can then be used
119 * in calls to drm_sysfs_device_add().
121 * Note, the pointer created here is to be destroyed when finished by making a
122 * call to drm_sysfs_destroy().
124 struct class *drm_sysfs_create(struct module *owner, char *name)
129 class = class_create(owner, name);
131 err = PTR_ERR(class);
135 class->pm = &drm_class_dev_pm_ops;
137 err = class_create_file(class, &class_attr_version.attr);
141 class->devnode = drm_devnode;
146 class_destroy(class);
152 * drm_sysfs_destroy - destroys DRM class
154 * Destroy the DRM device class.
156 void drm_sysfs_destroy(void)
158 if ((drm_class == NULL) || (IS_ERR(drm_class)))
160 class_remove_file(drm_class, &class_attr_version.attr);
161 class_destroy(drm_class);
166 * Connector properties
168 static ssize_t status_show(struct device *device,
169 struct device_attribute *attr,
172 struct drm_connector *connector = to_drm_connector(device);
173 enum drm_connector_status status;
176 ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
180 status = connector->funcs->detect(connector, true);
181 mutex_unlock(&connector->dev->mode_config.mutex);
183 return snprintf(buf, PAGE_SIZE, "%s\n",
184 drm_get_connector_status_name(status));
187 static ssize_t dpms_show(struct device *device,
188 struct device_attribute *attr,
191 struct drm_connector *connector = to_drm_connector(device);
192 struct drm_device *dev = connector->dev;
193 uint64_t dpms_status;
196 ret = drm_object_property_get_value(&connector->base,
197 dev->mode_config.dpms_property,
202 return snprintf(buf, PAGE_SIZE, "%s\n",
203 drm_get_dpms_name((int)dpms_status));
206 static ssize_t enabled_show(struct device *device,
207 struct device_attribute *attr,
210 struct drm_connector *connector = to_drm_connector(device);
212 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
216 static ssize_t edid_show(struct file *filp, struct kobject *kobj,
217 struct bin_attribute *attr, char *buf, loff_t off,
220 struct device *connector_dev = container_of(kobj, struct device, kobj);
221 struct drm_connector *connector = to_drm_connector(connector_dev);
225 if (!connector->edid_blob_ptr)
228 edid = connector->edid_blob_ptr->data;
229 size = connector->edid_blob_ptr->length;
236 if (off + count > size)
238 memcpy(buf, edid + off, count);
243 static ssize_t modes_show(struct device *device,
244 struct device_attribute *attr,
247 struct drm_connector *connector = to_drm_connector(device);
248 struct drm_display_mode *mode;
251 list_for_each_entry(mode, &connector->modes, head) {
252 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
259 static ssize_t subconnector_show(struct device *device,
260 struct device_attribute *attr,
263 struct drm_connector *connector = to_drm_connector(device);
264 struct drm_device *dev = connector->dev;
265 struct drm_property *prop = NULL;
266 uint64_t subconnector;
270 switch (connector->connector_type) {
271 case DRM_MODE_CONNECTOR_DVII:
272 prop = dev->mode_config.dvi_i_subconnector_property;
274 case DRM_MODE_CONNECTOR_Composite:
275 case DRM_MODE_CONNECTOR_SVIDEO:
276 case DRM_MODE_CONNECTOR_Component:
277 case DRM_MODE_CONNECTOR_TV:
278 prop = dev->mode_config.tv_subconnector_property;
282 DRM_ERROR("Wrong connector type for this property\n");
287 DRM_ERROR("Unable to find subconnector property\n");
291 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
295 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
296 drm_get_tv_subconnector_name((int)subconnector) :
297 drm_get_dvi_i_subconnector_name((int)subconnector));
300 static ssize_t select_subconnector_show(struct device *device,
301 struct device_attribute *attr,
304 struct drm_connector *connector = to_drm_connector(device);
305 struct drm_device *dev = connector->dev;
306 struct drm_property *prop = NULL;
307 uint64_t subconnector;
311 switch (connector->connector_type) {
312 case DRM_MODE_CONNECTOR_DVII:
313 prop = dev->mode_config.dvi_i_select_subconnector_property;
315 case DRM_MODE_CONNECTOR_Composite:
316 case DRM_MODE_CONNECTOR_SVIDEO:
317 case DRM_MODE_CONNECTOR_Component:
318 case DRM_MODE_CONNECTOR_TV:
319 prop = dev->mode_config.tv_select_subconnector_property;
323 DRM_ERROR("Wrong connector type for this property\n");
328 DRM_ERROR("Unable to find select subconnector property\n");
332 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
336 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
337 drm_get_tv_select_name((int)subconnector) :
338 drm_get_dvi_i_select_name((int)subconnector));
341 static struct device_attribute connector_attrs[] = {
348 /* These attributes are for both DVI-I connectors and all types of tv-out. */
349 static struct device_attribute connector_attrs_opt1[] = {
350 __ATTR_RO(subconnector),
351 __ATTR_RO(select_subconnector),
354 static struct bin_attribute edid_attr = {
362 * drm_sysfs_connector_add - add a connector to sysfs
363 * @connector: connector to add
365 * Create a connector device in sysfs, along with its associated connector
366 * properties (so far, connection status, dpms, mode list & edid) and
367 * generate a hotplug event so userspace knows there's a new connector
370 int drm_sysfs_connector_add(struct drm_connector *connector)
372 struct drm_device *dev = connector->dev;
381 connector->kdev = device_create(drm_class, dev->primary->kdev,
382 0, connector, "card%d-%s",
383 dev->primary->index, drm_get_connector_name(connector));
384 DRM_DEBUG("adding \"%s\" to sysfs\n",
385 drm_get_connector_name(connector));
387 if (IS_ERR(connector->kdev)) {
388 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
389 ret = PTR_ERR(connector->kdev);
393 /* Standard attributes */
395 for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
396 ret = device_create_file(connector->kdev, &connector_attrs[attr_cnt]);
401 /* Optional attributes */
403 * In the long run it maybe a good idea to make one set of
404 * optionals per connector type.
406 switch (connector->connector_type) {
407 case DRM_MODE_CONNECTOR_DVII:
408 case DRM_MODE_CONNECTOR_Composite:
409 case DRM_MODE_CONNECTOR_SVIDEO:
410 case DRM_MODE_CONNECTOR_Component:
411 case DRM_MODE_CONNECTOR_TV:
412 for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
413 ret = device_create_file(connector->kdev, &connector_attrs_opt1[opt_cnt]);
422 ret = sysfs_create_bin_file(&connector->kdev->kobj, &edid_attr);
426 /* Let userspace know we have a new connector */
427 drm_sysfs_hotplug_event(dev);
432 for (i = 0; i < opt_cnt; i++)
433 device_remove_file(connector->kdev, &connector_attrs_opt1[i]);
434 for (i = 0; i < attr_cnt; i++)
435 device_remove_file(connector->kdev, &connector_attrs[i]);
436 device_unregister(connector->kdev);
441 EXPORT_SYMBOL(drm_sysfs_connector_add);
444 * drm_sysfs_connector_remove - remove an connector device from sysfs
445 * @connector: connector to remove
447 * Remove @connector and its associated attributes from sysfs. Note that
448 * the device model core will take care of sending the "remove" uevent
449 * at this time, so we don't need to do it.
452 * This routine should only be called if the connector was previously
453 * successfully registered. If @connector hasn't been registered yet,
454 * you'll likely see a panic somewhere deep in sysfs code when called.
456 void drm_sysfs_connector_remove(struct drm_connector *connector)
460 if (!connector->kdev)
462 DRM_DEBUG("removing \"%s\" from sysfs\n",
463 drm_get_connector_name(connector));
465 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
466 device_remove_file(connector->kdev, &connector_attrs[i]);
467 sysfs_remove_bin_file(&connector->kdev->kobj, &edid_attr);
468 device_unregister(connector->kdev);
469 connector->kdev = NULL;
471 EXPORT_SYMBOL(drm_sysfs_connector_remove);
474 * drm_sysfs_hotplug_event - generate a DRM uevent
477 * Send a uevent for the DRM device specified by @dev. Currently we only
478 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
479 * deal with other types of events.
481 void drm_sysfs_hotplug_event(struct drm_device *dev)
483 char *event_string = "HOTPLUG=1";
484 char *envp[] = { event_string, NULL };
486 DRM_DEBUG("generating hotplug event\n");
488 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
490 EXPORT_SYMBOL(drm_sysfs_hotplug_event);
492 static void drm_sysfs_release(struct device *dev)
498 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
499 * @dev: DRM device to be added
500 * @head: DRM head in question
502 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
503 * as the parent for the Linux device, and make sure it has a file containing
504 * the driver we're using (for userspace compatibility).
506 int drm_sysfs_device_add(struct drm_minor *minor)
511 if (minor->type == DRM_MINOR_CONTROL)
512 minor_str = "controlD%d";
513 else if (minor->type == DRM_MINOR_RENDER)
514 minor_str = "renderD%d";
516 minor_str = "card%d";
518 minor->kdev = kzalloc(sizeof(*minor->kdev), GFP_KERNEL);
524 device_initialize(minor->kdev);
525 minor->kdev->devt = MKDEV(DRM_MAJOR, minor->index);
526 minor->kdev->class = drm_class;
527 minor->kdev->type = &drm_sysfs_device_minor;
528 minor->kdev->parent = minor->dev->dev;
529 minor->kdev->release = drm_sysfs_release;
530 dev_set_drvdata(minor->kdev, minor);
532 r = dev_set_name(minor->kdev, minor_str, minor->index);
536 r = device_add(minor->kdev);
543 DRM_ERROR("device create failed %d\n", r);
544 put_device(minor->kdev);
549 * drm_sysfs_device_remove - remove DRM device
550 * @dev: DRM device to remove
552 * This call unregisters and cleans up a class device that was created with a
553 * call to drm_sysfs_device_add()
555 void drm_sysfs_device_remove(struct drm_minor *minor)
558 device_unregister(minor->kdev);
564 * drm_class_device_register - Register a struct device in the drm class.
566 * @dev: pointer to struct device to register.
568 * @dev should have all relevant members pre-filled with the exception
569 * of the class member. In particular, the device_type member must
573 int drm_class_device_register(struct device *dev)
575 if (!drm_class || IS_ERR(drm_class))
578 dev->class = drm_class;
579 return device_register(dev);
581 EXPORT_SYMBOL_GPL(drm_class_device_register);
583 void drm_class_device_unregister(struct device *dev)
585 return device_unregister(dev);
587 EXPORT_SYMBOL_GPL(drm_class_device_unregister);