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);
125 static ssize_t show_dri(struct device *device, struct device_attribute *attr,
128 struct drm_minor *drm_minor = to_drm_minor(device);
129 struct drm_device *drm_dev = drm_minor->dev;
130 if (drm_dev->driver->dri_library_name)
131 return drm_dev->driver->dri_library_name(drm_dev, buf);
132 return snprintf(buf, PAGE_SIZE, "%s\n", drm_dev->driver->pci_driver.name);
135 static struct device_attribute device_attrs[] = {
136 __ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
140 * drm_sysfs_device_release - do nothing
143 * Normally, this would free the DRM device associated with @dev, along
144 * with cleaning up any other stuff. But we do that in the DRM core, so
145 * this function can just return and hope that the core does its job.
147 static void drm_sysfs_device_release(struct device *dev)
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);
163 return snprintf(buf, PAGE_SIZE, "%s",
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",
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, connector->encoder ? "enabled" :
196 static ssize_t edid_show(struct kobject *kobj, struct bin_attribute *attr,
197 char *buf, loff_t off, size_t count)
199 struct device *connector_dev = container_of(kobj, struct device, kobj);
200 struct drm_connector *connector = to_drm_connector(connector_dev);
204 if (!connector->edid_blob_ptr)
207 edid = connector->edid_blob_ptr->data;
208 size = connector->edid_blob_ptr->length;
215 if (off + count > size)
217 memcpy(buf, edid + off, count);
222 static ssize_t modes_show(struct device *device,
223 struct device_attribute *attr,
226 struct drm_connector *connector = to_drm_connector(device);
227 struct drm_display_mode *mode;
230 list_for_each_entry(mode, &connector->modes, head) {
231 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
238 static ssize_t subconnector_show(struct device *device,
239 struct device_attribute *attr,
242 struct drm_connector *connector = to_drm_connector(device);
243 struct drm_device *dev = connector->dev;
244 struct drm_property *prop = NULL;
245 uint64_t subconnector;
249 switch (connector->connector_type) {
250 case DRM_MODE_CONNECTOR_DVII:
251 prop = dev->mode_config.dvi_i_subconnector_property;
253 case DRM_MODE_CONNECTOR_Composite:
254 case DRM_MODE_CONNECTOR_SVIDEO:
255 case DRM_MODE_CONNECTOR_Component:
256 prop = dev->mode_config.tv_subconnector_property;
260 DRM_ERROR("Wrong connector type for this property\n");
265 DRM_ERROR("Unable to find subconnector property\n");
269 ret = drm_connector_property_get_value(connector, prop, &subconnector);
273 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
274 drm_get_tv_subconnector_name((int)subconnector) :
275 drm_get_dvi_i_subconnector_name((int)subconnector));
278 static ssize_t select_subconnector_show(struct device *device,
279 struct device_attribute *attr,
282 struct drm_connector *connector = to_drm_connector(device);
283 struct drm_device *dev = connector->dev;
284 struct drm_property *prop = NULL;
285 uint64_t subconnector;
289 switch (connector->connector_type) {
290 case DRM_MODE_CONNECTOR_DVII:
291 prop = dev->mode_config.dvi_i_select_subconnector_property;
293 case DRM_MODE_CONNECTOR_Composite:
294 case DRM_MODE_CONNECTOR_SVIDEO:
295 case DRM_MODE_CONNECTOR_Component:
296 prop = dev->mode_config.tv_select_subconnector_property;
300 DRM_ERROR("Wrong connector type for this property\n");
305 DRM_ERROR("Unable to find select subconnector property\n");
309 ret = drm_connector_property_get_value(connector, prop, &subconnector);
313 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
314 drm_get_tv_select_name((int)subconnector) :
315 drm_get_dvi_i_select_name((int)subconnector));
318 static struct device_attribute connector_attrs[] = {
325 /* These attributes are for both DVI-I connectors and all types of tv-out. */
326 static struct device_attribute connector_attrs_opt1[] = {
327 __ATTR_RO(subconnector),
328 __ATTR_RO(select_subconnector),
331 static struct bin_attribute edid_attr = {
338 * drm_sysfs_connector_add - add an connector to sysfs
339 * @connector: connector to add
341 * Create an connector device in sysfs, along with its associated connector
342 * properties (so far, connection status, dpms, mode list & edid) and
343 * generate a hotplug event so userspace knows there's a new connector
347 * This routine should only be called *once* for each DRM minor registered.
348 * A second call for an already registered device will trigger the BUG_ON
351 int drm_sysfs_connector_add(struct drm_connector *connector)
353 struct drm_device *dev = connector->dev;
356 /* We shouldn't get called more than once for the same connector */
357 BUG_ON(device_is_registered(&connector->kdev));
359 connector->kdev.parent = &dev->primary->kdev;
360 connector->kdev.class = drm_class;
361 connector->kdev.release = drm_sysfs_device_release;
363 DRM_DEBUG("adding \"%s\" to sysfs\n",
364 drm_get_connector_name(connector));
366 snprintf(connector->kdev.bus_id, BUS_ID_SIZE, "card%d-%s",
367 dev->primary->index, drm_get_connector_name(connector));
368 ret = device_register(&connector->kdev);
371 DRM_ERROR("failed to register connector device: %d\n", ret);
375 /* Standard attributes */
377 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++) {
378 ret = device_create_file(&connector->kdev, &connector_attrs[i]);
383 /* Optional attributes */
385 * In the long run it maybe a good idea to make one set of
386 * optionals per connector type.
388 switch (connector->connector_type) {
389 case DRM_MODE_CONNECTOR_DVII:
390 case DRM_MODE_CONNECTOR_Composite:
391 case DRM_MODE_CONNECTOR_SVIDEO:
392 case DRM_MODE_CONNECTOR_Component:
393 for (i = 0; i < ARRAY_SIZE(connector_attrs_opt1); i++) {
394 ret = device_create_file(&connector->kdev, &connector_attrs_opt1[i]);
403 ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
407 /* Let userspace know we have a new connector */
408 drm_sysfs_hotplug_event(dev);
414 for (j = 0; j < i; j++)
415 device_remove_file(&connector->kdev,
416 &connector_attrs[i]);
417 device_unregister(&connector->kdev);
422 EXPORT_SYMBOL(drm_sysfs_connector_add);
425 * drm_sysfs_connector_remove - remove an connector device from sysfs
426 * @connector: connector to remove
428 * Remove @connector and its associated attributes from sysfs. Note that
429 * the device model core will take care of sending the "remove" uevent
430 * at this time, so we don't need to do it.
433 * This routine should only be called if the connector was previously
434 * successfully registered. If @connector hasn't been registered yet,
435 * you'll likely see a panic somewhere deep in sysfs code when called.
437 void drm_sysfs_connector_remove(struct drm_connector *connector)
441 DRM_DEBUG("removing \"%s\" from sysfs\n",
442 drm_get_connector_name(connector));
444 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
445 device_remove_file(&connector->kdev, &connector_attrs[i]);
446 sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
447 device_unregister(&connector->kdev);
449 EXPORT_SYMBOL(drm_sysfs_connector_remove);
452 * drm_sysfs_hotplug_event - generate a DRM uevent
455 * Send a uevent for the DRM device specified by @dev. Currently we only
456 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
457 * deal with other types of events.
459 void drm_sysfs_hotplug_event(struct drm_device *dev)
461 char *event_string = "HOTPLUG=1";
462 char *envp[] = { event_string, NULL };
464 DRM_DEBUG("generating hotplug event\n");
466 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
470 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
471 * @dev: DRM device to be added
472 * @head: DRM head in question
474 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
475 * as the parent for the Linux device, and make sure it has a file containing
476 * the driver we're using (for userspace compatibility).
478 int drm_sysfs_device_add(struct drm_minor *minor)
484 minor->kdev.parent = &minor->dev->pdev->dev;
485 minor->kdev.class = drm_class;
486 minor->kdev.release = drm_sysfs_device_release;
487 minor->kdev.devt = minor->device;
488 if (minor->type == DRM_MINOR_CONTROL)
489 minor_str = "controlD%d";
490 else if (minor->type == DRM_MINOR_RENDER)
491 minor_str = "renderD%d";
493 minor_str = "card%d";
495 dev_set_name(&minor->kdev, minor_str, minor->index);
497 err = device_register(&minor->kdev);
499 DRM_ERROR("device add failed: %d\n", err);
503 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
504 err = device_create_file(&minor->kdev, &device_attrs[i]);
513 for (j = 0; j < i; j++)
514 device_remove_file(&minor->kdev, &device_attrs[j]);
515 device_unregister(&minor->kdev);
522 * drm_sysfs_device_remove - remove DRM device
523 * @dev: DRM device to remove
525 * This call unregisters and cleans up a class device that was created with a
526 * call to drm_sysfs_device_add()
528 void drm_sysfs_device_remove(struct drm_minor *minor)
532 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
533 device_remove_file(&minor->kdev, &device_attrs[i]);
534 device_unregister(&minor->kdev);