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/err.h>
22 #define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
23 #define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
26 * drm_sysfs_suspend - DRM class suspend hook
27 * @dev: Linux device to suspend
28 * @state: power state to enter
30 * Just figures out what the actual struct drm_device associated with
31 * @dev is and calls its suspend hook, if present.
33 static int drm_sysfs_suspend(struct device *dev, pm_message_t state)
35 struct drm_minor *drm_minor = to_drm_minor(dev);
36 struct drm_device *drm_dev = drm_minor->dev;
38 if (drm_minor->type == DRM_MINOR_LEGACY &&
39 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
40 drm_dev->driver->suspend)
41 return drm_dev->driver->suspend(drm_dev, state);
47 * drm_sysfs_resume - DRM class resume hook
48 * @dev: Linux device to resume
50 * Just figures out what the actual struct drm_device associated with
51 * @dev is and calls its resume hook, if present.
53 static int drm_sysfs_resume(struct device *dev)
55 struct drm_minor *drm_minor = to_drm_minor(dev);
56 struct drm_device *drm_dev = drm_minor->dev;
58 if (drm_minor->type == DRM_MINOR_LEGACY &&
59 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
60 drm_dev->driver->resume)
61 return drm_dev->driver->resume(drm_dev);
66 /* Display the version of drm_core. This doesn't work right in current design */
67 static ssize_t version_show(struct class *dev, char *buf)
69 return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
70 CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
73 static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
76 * drm_sysfs_create - create a struct drm_sysfs_class structure
77 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
78 * @name: pointer to a string for the name of this class.
80 * This is used to create DRM class pointer that can then be used
81 * in calls to drm_sysfs_device_add().
83 * Note, the pointer created here is to be destroyed when finished by making a
84 * call to drm_sysfs_destroy().
86 struct class *drm_sysfs_create(struct module *owner, char *name)
91 class = class_create(owner, name);
97 class->suspend = drm_sysfs_suspend;
98 class->resume = drm_sysfs_resume;
100 err = class_create_file(class, &class_attr_version);
107 class_destroy(class);
113 * drm_sysfs_destroy - destroys DRM class
115 * Destroy the DRM device class.
117 void drm_sysfs_destroy(void)
119 if ((drm_class == NULL) || (IS_ERR(drm_class)))
121 class_remove_file(drm_class, &class_attr_version);
122 class_destroy(drm_class);
126 * drm_sysfs_device_release - do nothing
129 * Normally, this would free the DRM device associated with @dev, along
130 * with cleaning up any other stuff. But we do that in the DRM core, so
131 * this function can just return and hope that the core does its job.
133 static void drm_sysfs_device_release(struct device *dev)
135 memset(dev, 0, sizeof(struct device));
140 * Connector properties
142 static ssize_t status_show(struct device *device,
143 struct device_attribute *attr,
146 struct drm_connector *connector = to_drm_connector(device);
147 enum drm_connector_status status;
149 status = connector->funcs->detect(connector);
150 return snprintf(buf, PAGE_SIZE, "%s\n",
151 drm_get_connector_status_name(status));
154 static ssize_t dpms_show(struct device *device,
155 struct device_attribute *attr,
158 struct drm_connector *connector = to_drm_connector(device);
159 struct drm_device *dev = connector->dev;
160 uint64_t dpms_status;
163 ret = drm_connector_property_get_value(connector,
164 dev->mode_config.dpms_property,
169 return snprintf(buf, PAGE_SIZE, "%s\n",
170 drm_get_dpms_name((int)dpms_status));
173 static ssize_t enabled_show(struct device *device,
174 struct device_attribute *attr,
177 struct drm_connector *connector = to_drm_connector(device);
179 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
183 static ssize_t edid_show(struct kobject *kobj, struct bin_attribute *attr,
184 char *buf, loff_t off, size_t count)
186 struct device *connector_dev = container_of(kobj, struct device, kobj);
187 struct drm_connector *connector = to_drm_connector(connector_dev);
191 if (!connector->edid_blob_ptr)
194 edid = connector->edid_blob_ptr->data;
195 size = connector->edid_blob_ptr->length;
202 if (off + count > size)
204 memcpy(buf, edid + off, count);
209 static ssize_t modes_show(struct device *device,
210 struct device_attribute *attr,
213 struct drm_connector *connector = to_drm_connector(device);
214 struct drm_display_mode *mode;
217 list_for_each_entry(mode, &connector->modes, head) {
218 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
225 static ssize_t subconnector_show(struct device *device,
226 struct device_attribute *attr,
229 struct drm_connector *connector = to_drm_connector(device);
230 struct drm_device *dev = connector->dev;
231 struct drm_property *prop = NULL;
232 uint64_t subconnector;
236 switch (connector->connector_type) {
237 case DRM_MODE_CONNECTOR_DVII:
238 prop = dev->mode_config.dvi_i_subconnector_property;
240 case DRM_MODE_CONNECTOR_Composite:
241 case DRM_MODE_CONNECTOR_SVIDEO:
242 case DRM_MODE_CONNECTOR_Component:
243 prop = dev->mode_config.tv_subconnector_property;
247 DRM_ERROR("Wrong connector type for this property\n");
252 DRM_ERROR("Unable to find subconnector property\n");
256 ret = drm_connector_property_get_value(connector, prop, &subconnector);
260 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
261 drm_get_tv_subconnector_name((int)subconnector) :
262 drm_get_dvi_i_subconnector_name((int)subconnector));
265 static ssize_t select_subconnector_show(struct device *device,
266 struct device_attribute *attr,
269 struct drm_connector *connector = to_drm_connector(device);
270 struct drm_device *dev = connector->dev;
271 struct drm_property *prop = NULL;
272 uint64_t subconnector;
276 switch (connector->connector_type) {
277 case DRM_MODE_CONNECTOR_DVII:
278 prop = dev->mode_config.dvi_i_select_subconnector_property;
280 case DRM_MODE_CONNECTOR_Composite:
281 case DRM_MODE_CONNECTOR_SVIDEO:
282 case DRM_MODE_CONNECTOR_Component:
283 prop = dev->mode_config.tv_select_subconnector_property;
287 DRM_ERROR("Wrong connector type for this property\n");
292 DRM_ERROR("Unable to find select subconnector property\n");
296 ret = drm_connector_property_get_value(connector, prop, &subconnector);
300 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
301 drm_get_tv_select_name((int)subconnector) :
302 drm_get_dvi_i_select_name((int)subconnector));
305 static struct device_attribute connector_attrs[] = {
312 /* These attributes are for both DVI-I connectors and all types of tv-out. */
313 static struct device_attribute connector_attrs_opt1[] = {
314 __ATTR_RO(subconnector),
315 __ATTR_RO(select_subconnector),
318 static struct bin_attribute edid_attr = {
326 * drm_sysfs_connector_add - add an connector to sysfs
327 * @connector: connector to add
329 * Create an connector device in sysfs, along with its associated connector
330 * properties (so far, connection status, dpms, mode list & edid) and
331 * generate a hotplug event so userspace knows there's a new connector
335 * This routine should only be called *once* for each DRM minor registered.
336 * A second call for an already registered device will trigger the BUG_ON
339 int drm_sysfs_connector_add(struct drm_connector *connector)
341 struct drm_device *dev = connector->dev;
344 /* We shouldn't get called more than once for the same connector */
345 BUG_ON(device_is_registered(&connector->kdev));
347 connector->kdev.parent = &dev->primary->kdev;
348 connector->kdev.class = drm_class;
349 connector->kdev.release = drm_sysfs_device_release;
351 DRM_DEBUG("adding \"%s\" to sysfs\n",
352 drm_get_connector_name(connector));
354 dev_set_name(&connector->kdev, "card%d-%s",
355 dev->primary->index, drm_get_connector_name(connector));
356 ret = device_register(&connector->kdev);
359 DRM_ERROR("failed to register connector device: %d\n", ret);
363 /* Standard attributes */
365 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++) {
366 ret = device_create_file(&connector->kdev, &connector_attrs[i]);
371 /* Optional attributes */
373 * In the long run it maybe a good idea to make one set of
374 * optionals per connector type.
376 switch (connector->connector_type) {
377 case DRM_MODE_CONNECTOR_DVII:
378 case DRM_MODE_CONNECTOR_Composite:
379 case DRM_MODE_CONNECTOR_SVIDEO:
380 case DRM_MODE_CONNECTOR_Component:
381 for (i = 0; i < ARRAY_SIZE(connector_attrs_opt1); i++) {
382 ret = device_create_file(&connector->kdev, &connector_attrs_opt1[i]);
391 ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
395 /* Let userspace know we have a new connector */
396 drm_sysfs_hotplug_event(dev);
402 for (j = 0; j < i; j++)
403 device_remove_file(&connector->kdev,
404 &connector_attrs[i]);
405 device_unregister(&connector->kdev);
410 EXPORT_SYMBOL(drm_sysfs_connector_add);
413 * drm_sysfs_connector_remove - remove an connector device from sysfs
414 * @connector: connector to remove
416 * Remove @connector and its associated attributes from sysfs. Note that
417 * the device model core will take care of sending the "remove" uevent
418 * at this time, so we don't need to do it.
421 * This routine should only be called if the connector was previously
422 * successfully registered. If @connector hasn't been registered yet,
423 * you'll likely see a panic somewhere deep in sysfs code when called.
425 void drm_sysfs_connector_remove(struct drm_connector *connector)
429 DRM_DEBUG("removing \"%s\" from sysfs\n",
430 drm_get_connector_name(connector));
432 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
433 device_remove_file(&connector->kdev, &connector_attrs[i]);
434 sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
435 device_unregister(&connector->kdev);
437 EXPORT_SYMBOL(drm_sysfs_connector_remove);
440 * drm_sysfs_hotplug_event - generate a DRM uevent
443 * Send a uevent for the DRM device specified by @dev. Currently we only
444 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
445 * deal with other types of events.
447 void drm_sysfs_hotplug_event(struct drm_device *dev)
449 char *event_string = "HOTPLUG=1";
450 char *envp[] = { event_string, NULL };
452 DRM_DEBUG("generating hotplug event\n");
454 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
456 EXPORT_SYMBOL(drm_sysfs_hotplug_event);
459 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
460 * @dev: DRM device to be added
461 * @head: DRM head in question
463 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
464 * as the parent for the Linux device, and make sure it has a file containing
465 * the driver we're using (for userspace compatibility).
467 int drm_sysfs_device_add(struct drm_minor *minor)
472 minor->kdev.parent = &minor->dev->pdev->dev;
473 minor->kdev.class = drm_class;
474 minor->kdev.release = drm_sysfs_device_release;
475 minor->kdev.devt = minor->device;
476 if (minor->type == DRM_MINOR_CONTROL)
477 minor_str = "controlD%d";
478 else if (minor->type == DRM_MINOR_RENDER)
479 minor_str = "renderD%d";
481 minor_str = "card%d";
483 dev_set_name(&minor->kdev, minor_str, minor->index);
485 err = device_register(&minor->kdev);
487 DRM_ERROR("device add failed: %d\n", err);
498 * drm_sysfs_device_remove - remove DRM device
499 * @dev: DRM device to remove
501 * This call unregisters and cleans up a class device that was created with a
502 * call to drm_sysfs_device_add()
504 void drm_sysfs_device_remove(struct drm_minor *minor)
506 device_unregister(&minor->kdev);