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>
20 #include "drm_sysfs.h"
24 #define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
25 #define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
27 static struct device_type drm_sysfs_device_minor = {
32 * drm_class_suspend - DRM class suspend hook
33 * @dev: Linux device to suspend
34 * @state: power state to enter
36 * Just figures out what the actual struct drm_device associated with
37 * @dev is and calls its suspend hook, if present.
39 static int drm_class_suspend(struct device *dev, pm_message_t state)
41 if (dev->type == &drm_sysfs_device_minor) {
42 struct drm_minor *drm_minor = to_drm_minor(dev);
43 struct drm_device *drm_dev = drm_minor->dev;
45 if (drm_minor->type == DRM_MINOR_LEGACY &&
46 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
47 drm_dev->driver->suspend)
48 return drm_dev->driver->suspend(drm_dev, state);
54 * drm_class_resume - DRM class resume hook
55 * @dev: Linux device to resume
57 * Just figures out what the actual struct drm_device associated with
58 * @dev is and calls its resume hook, if present.
60 static int drm_class_resume(struct device *dev)
62 if (dev->type == &drm_sysfs_device_minor) {
63 struct drm_minor *drm_minor = to_drm_minor(dev);
64 struct drm_device *drm_dev = drm_minor->dev;
66 if (drm_minor->type == DRM_MINOR_LEGACY &&
67 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
68 drm_dev->driver->resume)
69 return drm_dev->driver->resume(drm_dev);
74 static char *drm_devnode(struct device *dev, mode_t *mode)
76 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
79 static CLASS_ATTR_STRING(version, S_IRUGO,
81 __stringify(CORE_MAJOR) "."
82 __stringify(CORE_MINOR) "."
83 __stringify(CORE_PATCHLEVEL) " "
87 * drm_sysfs_create - create a struct drm_sysfs_class structure
88 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
89 * @name: pointer to a string for the name of this class.
91 * This is used to create DRM class pointer that can then be used
92 * in calls to drm_sysfs_device_add().
94 * Note, the pointer created here is to be destroyed when finished by making a
95 * call to drm_sysfs_destroy().
97 struct class *drm_sysfs_create(struct module *owner, char *name)
102 class = class_create(owner, name);
104 err = PTR_ERR(class);
108 class->suspend = drm_class_suspend;
109 class->resume = drm_class_resume;
111 err = class_create_file(class, &class_attr_version.attr);
115 class->devnode = drm_devnode;
120 class_destroy(class);
126 * drm_sysfs_destroy - destroys DRM class
128 * Destroy the DRM device class.
130 void drm_sysfs_destroy(void)
132 if ((drm_class == NULL) || (IS_ERR(drm_class)))
134 class_remove_file(drm_class, &class_attr_version.attr);
135 class_destroy(drm_class);
139 * drm_sysfs_device_release - do nothing
142 * Normally, this would free the DRM device associated with @dev, along
143 * with cleaning up any other stuff. But we do that in the DRM core, so
144 * this function can just return and hope that the core does its job.
146 static void drm_sysfs_device_release(struct device *dev)
148 memset(dev, 0, sizeof(struct device));
153 * Connector properties
155 static ssize_t status_show(struct device *device,
156 struct device_attribute *attr,
159 struct drm_connector *connector = to_drm_connector(device);
160 enum drm_connector_status status;
162 status = connector->funcs->detect(connector, true);
163 return snprintf(buf, PAGE_SIZE, "%s\n",
164 drm_get_connector_status_name(status));
167 static ssize_t dpms_show(struct device *device,
168 struct device_attribute *attr,
171 struct drm_connector *connector = to_drm_connector(device);
172 struct drm_device *dev = connector->dev;
173 uint64_t dpms_status;
176 ret = drm_connector_property_get_value(connector,
177 dev->mode_config.dpms_property,
182 return snprintf(buf, PAGE_SIZE, "%s\n",
183 drm_get_dpms_name((int)dpms_status));
186 static ssize_t enabled_show(struct device *device,
187 struct device_attribute *attr,
190 struct drm_connector *connector = to_drm_connector(device);
192 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
196 static ssize_t edid_show(struct file *filp, struct kobject *kobj,
197 struct bin_attribute *attr, char *buf, loff_t off,
200 struct device *connector_dev = container_of(kobj, struct device, kobj);
201 struct drm_connector *connector = to_drm_connector(connector_dev);
205 if (!connector->edid_blob_ptr)
208 edid = connector->edid_blob_ptr->data;
209 size = connector->edid_blob_ptr->length;
216 if (off + count > size)
218 memcpy(buf, edid + off, count);
223 static ssize_t modes_show(struct device *device,
224 struct device_attribute *attr,
227 struct drm_connector *connector = to_drm_connector(device);
228 struct drm_display_mode *mode;
231 list_for_each_entry(mode, &connector->modes, head) {
232 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
239 static ssize_t subconnector_show(struct device *device,
240 struct device_attribute *attr,
243 struct drm_connector *connector = to_drm_connector(device);
244 struct drm_device *dev = connector->dev;
245 struct drm_property *prop = NULL;
246 uint64_t subconnector;
250 switch (connector->connector_type) {
251 case DRM_MODE_CONNECTOR_DVII:
252 prop = dev->mode_config.dvi_i_subconnector_property;
254 case DRM_MODE_CONNECTOR_Composite:
255 case DRM_MODE_CONNECTOR_SVIDEO:
256 case DRM_MODE_CONNECTOR_Component:
257 case DRM_MODE_CONNECTOR_TV:
258 prop = dev->mode_config.tv_subconnector_property;
262 DRM_ERROR("Wrong connector type for this property\n");
267 DRM_ERROR("Unable to find subconnector property\n");
271 ret = drm_connector_property_get_value(connector, prop, &subconnector);
275 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
276 drm_get_tv_subconnector_name((int)subconnector) :
277 drm_get_dvi_i_subconnector_name((int)subconnector));
280 static ssize_t select_subconnector_show(struct device *device,
281 struct device_attribute *attr,
284 struct drm_connector *connector = to_drm_connector(device);
285 struct drm_device *dev = connector->dev;
286 struct drm_property *prop = NULL;
287 uint64_t subconnector;
291 switch (connector->connector_type) {
292 case DRM_MODE_CONNECTOR_DVII:
293 prop = dev->mode_config.dvi_i_select_subconnector_property;
295 case DRM_MODE_CONNECTOR_Composite:
296 case DRM_MODE_CONNECTOR_SVIDEO:
297 case DRM_MODE_CONNECTOR_Component:
298 case DRM_MODE_CONNECTOR_TV:
299 prop = dev->mode_config.tv_select_subconnector_property;
303 DRM_ERROR("Wrong connector type for this property\n");
308 DRM_ERROR("Unable to find select subconnector property\n");
312 ret = drm_connector_property_get_value(connector, prop, &subconnector);
316 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
317 drm_get_tv_select_name((int)subconnector) :
318 drm_get_dvi_i_select_name((int)subconnector));
321 static struct device_attribute connector_attrs[] = {
328 /* These attributes are for both DVI-I connectors and all types of tv-out. */
329 static struct device_attribute connector_attrs_opt1[] = {
330 __ATTR_RO(subconnector),
331 __ATTR_RO(select_subconnector),
334 static struct bin_attribute edid_attr = {
342 * drm_sysfs_connector_add - add an connector to sysfs
343 * @connector: connector to add
345 * Create an connector device in sysfs, along with its associated connector
346 * properties (so far, connection status, dpms, mode list & edid) and
347 * generate a hotplug event so userspace knows there's a new connector
351 * This routine should only be called *once* for each DRM minor registered.
352 * A second call for an already registered device will trigger the BUG_ON
355 int drm_sysfs_connector_add(struct drm_connector *connector)
357 struct drm_device *dev = connector->dev;
363 /* We shouldn't get called more than once for the same connector */
364 BUG_ON(device_is_registered(&connector->kdev));
366 connector->kdev.parent = &dev->primary->kdev;
367 connector->kdev.class = drm_class;
368 connector->kdev.release = drm_sysfs_device_release;
370 DRM_DEBUG("adding \"%s\" to sysfs\n",
371 drm_get_connector_name(connector));
373 dev_set_name(&connector->kdev, "card%d-%s",
374 dev->primary->index, drm_get_connector_name(connector));
375 ret = device_register(&connector->kdev);
378 DRM_ERROR("failed to register connector device: %d\n", ret);
382 /* Standard attributes */
384 for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
385 ret = device_create_file(&connector->kdev, &connector_attrs[attr_cnt]);
390 /* Optional attributes */
392 * In the long run it maybe a good idea to make one set of
393 * optionals per connector type.
395 switch (connector->connector_type) {
396 case DRM_MODE_CONNECTOR_DVII:
397 case DRM_MODE_CONNECTOR_Composite:
398 case DRM_MODE_CONNECTOR_SVIDEO:
399 case DRM_MODE_CONNECTOR_Component:
400 case DRM_MODE_CONNECTOR_TV:
401 for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
402 ret = device_create_file(&connector->kdev, &connector_attrs_opt1[opt_cnt]);
411 ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
415 /* Let userspace know we have a new connector */
416 drm_sysfs_hotplug_event(dev);
421 for (i = 0; i < opt_cnt; i++)
422 device_remove_file(&connector->kdev, &connector_attrs_opt1[i]);
423 for (i = 0; i < attr_cnt; i++)
424 device_remove_file(&connector->kdev, &connector_attrs[i]);
425 device_unregister(&connector->kdev);
430 EXPORT_SYMBOL(drm_sysfs_connector_add);
433 * drm_sysfs_connector_remove - remove an connector device from sysfs
434 * @connector: connector to remove
436 * Remove @connector and its associated attributes from sysfs. Note that
437 * the device model core will take care of sending the "remove" uevent
438 * at this time, so we don't need to do it.
441 * This routine should only be called if the connector was previously
442 * successfully registered. If @connector hasn't been registered yet,
443 * you'll likely see a panic somewhere deep in sysfs code when called.
445 void drm_sysfs_connector_remove(struct drm_connector *connector)
449 DRM_DEBUG("removing \"%s\" from sysfs\n",
450 drm_get_connector_name(connector));
452 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
453 device_remove_file(&connector->kdev, &connector_attrs[i]);
454 sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
455 device_unregister(&connector->kdev);
457 EXPORT_SYMBOL(drm_sysfs_connector_remove);
460 * drm_sysfs_hotplug_event - generate a DRM uevent
463 * Send a uevent for the DRM device specified by @dev. Currently we only
464 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
465 * deal with other types of events.
467 void drm_sysfs_hotplug_event(struct drm_device *dev)
469 char *event_string = "HOTPLUG=1";
470 char *envp[] = { event_string, NULL };
472 DRM_DEBUG("generating hotplug event\n");
474 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
476 EXPORT_SYMBOL(drm_sysfs_hotplug_event);
479 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
480 * @dev: DRM device to be added
481 * @head: DRM head in question
483 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
484 * as the parent for the Linux device, and make sure it has a file containing
485 * the driver we're using (for userspace compatibility).
487 int drm_sysfs_device_add(struct drm_minor *minor)
492 minor->kdev.parent = minor->dev->dev;
494 minor->kdev.class = drm_class;
495 minor->kdev.release = drm_sysfs_device_release;
496 minor->kdev.devt = minor->device;
497 minor->kdev.type = &drm_sysfs_device_minor;
498 if (minor->type == DRM_MINOR_CONTROL)
499 minor_str = "controlD%d";
500 else if (minor->type == DRM_MINOR_RENDER)
501 minor_str = "renderD%d";
503 minor_str = "card%d";
505 dev_set_name(&minor->kdev, minor_str, minor->index);
507 err = device_register(&minor->kdev);
509 DRM_ERROR("device add failed: %d\n", err);
520 * drm_sysfs_device_remove - remove DRM device
521 * @dev: DRM device to remove
523 * This call unregisters and cleans up a class device that was created with a
524 * call to drm_sysfs_device_add()
526 void drm_sysfs_device_remove(struct drm_minor *minor)
528 device_unregister(&minor->kdev);
533 * drm_class_device_register - Register a struct device in the drm class.
535 * @dev: pointer to struct device to register.
537 * @dev should have all relevant members pre-filled with the exception
538 * of the class member. In particular, the device_type member must
542 int drm_class_device_register(struct device *dev)
544 dev->class = drm_class;
545 return device_register(dev);
547 EXPORT_SYMBOL_GPL(drm_class_device_register);
549 void drm_class_device_unregister(struct device *dev)
551 return device_unregister(dev);
553 EXPORT_SYMBOL_GPL(drm_class_device_unregister);