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 char *drm_nodename(struct device *dev)
75 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
78 static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
81 * drm_sysfs_create - create a struct drm_sysfs_class structure
82 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
83 * @name: pointer to a string for the name of this class.
85 * This is used to create DRM class pointer that can then be used
86 * in calls to drm_sysfs_device_add().
88 * Note, the pointer created here is to be destroyed when finished by making a
89 * call to drm_sysfs_destroy().
91 struct class *drm_sysfs_create(struct module *owner, char *name)
96 class = class_create(owner, name);
102 class->suspend = drm_sysfs_suspend;
103 class->resume = drm_sysfs_resume;
105 err = class_create_file(class, &class_attr_version);
109 class->nodename = drm_nodename;
114 class_destroy(class);
120 * drm_sysfs_destroy - destroys DRM class
122 * Destroy the DRM device class.
124 void drm_sysfs_destroy(void)
126 if ((drm_class == NULL) || (IS_ERR(drm_class)))
128 class_remove_file(drm_class, &class_attr_version);
129 class_destroy(drm_class);
133 * drm_sysfs_device_release - do nothing
136 * Normally, this would free the DRM device associated with @dev, along
137 * with cleaning up any other stuff. But we do that in the DRM core, so
138 * this function can just return and hope that the core does its job.
140 static void drm_sysfs_device_release(struct device *dev)
142 memset(dev, 0, sizeof(struct device));
147 * Connector properties
149 static ssize_t status_show(struct device *device,
150 struct device_attribute *attr,
153 struct drm_connector *connector = to_drm_connector(device);
154 enum drm_connector_status status;
156 status = connector->funcs->detect(connector);
157 return snprintf(buf, PAGE_SIZE, "%s\n",
158 drm_get_connector_status_name(status));
161 static ssize_t dpms_show(struct device *device,
162 struct device_attribute *attr,
165 struct drm_connector *connector = to_drm_connector(device);
166 struct drm_device *dev = connector->dev;
167 uint64_t dpms_status;
170 ret = drm_connector_property_get_value(connector,
171 dev->mode_config.dpms_property,
176 return snprintf(buf, PAGE_SIZE, "%s\n",
177 drm_get_dpms_name((int)dpms_status));
180 static ssize_t enabled_show(struct device *device,
181 struct device_attribute *attr,
184 struct drm_connector *connector = to_drm_connector(device);
186 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
190 static ssize_t edid_show(struct kobject *kobj, struct bin_attribute *attr,
191 char *buf, loff_t off, size_t count)
193 struct device *connector_dev = container_of(kobj, struct device, kobj);
194 struct drm_connector *connector = to_drm_connector(connector_dev);
198 if (!connector->edid_blob_ptr)
201 edid = connector->edid_blob_ptr->data;
202 size = connector->edid_blob_ptr->length;
209 if (off + count > size)
211 memcpy(buf, edid + off, count);
216 static ssize_t modes_show(struct device *device,
217 struct device_attribute *attr,
220 struct drm_connector *connector = to_drm_connector(device);
221 struct drm_display_mode *mode;
224 list_for_each_entry(mode, &connector->modes, head) {
225 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
232 static ssize_t subconnector_show(struct device *device,
233 struct device_attribute *attr,
236 struct drm_connector *connector = to_drm_connector(device);
237 struct drm_device *dev = connector->dev;
238 struct drm_property *prop = NULL;
239 uint64_t subconnector;
243 switch (connector->connector_type) {
244 case DRM_MODE_CONNECTOR_DVII:
245 prop = dev->mode_config.dvi_i_subconnector_property;
247 case DRM_MODE_CONNECTOR_Composite:
248 case DRM_MODE_CONNECTOR_SVIDEO:
249 case DRM_MODE_CONNECTOR_Component:
250 prop = dev->mode_config.tv_subconnector_property;
254 DRM_ERROR("Wrong connector type for this property\n");
259 DRM_ERROR("Unable to find subconnector property\n");
263 ret = drm_connector_property_get_value(connector, prop, &subconnector);
267 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
268 drm_get_tv_subconnector_name((int)subconnector) :
269 drm_get_dvi_i_subconnector_name((int)subconnector));
272 static ssize_t select_subconnector_show(struct device *device,
273 struct device_attribute *attr,
276 struct drm_connector *connector = to_drm_connector(device);
277 struct drm_device *dev = connector->dev;
278 struct drm_property *prop = NULL;
279 uint64_t subconnector;
283 switch (connector->connector_type) {
284 case DRM_MODE_CONNECTOR_DVII:
285 prop = dev->mode_config.dvi_i_select_subconnector_property;
287 case DRM_MODE_CONNECTOR_Composite:
288 case DRM_MODE_CONNECTOR_SVIDEO:
289 case DRM_MODE_CONNECTOR_Component:
290 prop = dev->mode_config.tv_select_subconnector_property;
294 DRM_ERROR("Wrong connector type for this property\n");
299 DRM_ERROR("Unable to find select subconnector property\n");
303 ret = drm_connector_property_get_value(connector, prop, &subconnector);
307 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
308 drm_get_tv_select_name((int)subconnector) :
309 drm_get_dvi_i_select_name((int)subconnector));
312 static struct device_attribute connector_attrs[] = {
319 /* These attributes are for both DVI-I connectors and all types of tv-out. */
320 static struct device_attribute connector_attrs_opt1[] = {
321 __ATTR_RO(subconnector),
322 __ATTR_RO(select_subconnector),
325 static struct bin_attribute edid_attr = {
333 * drm_sysfs_connector_add - add an connector to sysfs
334 * @connector: connector to add
336 * Create an connector device in sysfs, along with its associated connector
337 * properties (so far, connection status, dpms, mode list & edid) and
338 * generate a hotplug event so userspace knows there's a new connector
342 * This routine should only be called *once* for each DRM minor registered.
343 * A second call for an already registered device will trigger the BUG_ON
346 int drm_sysfs_connector_add(struct drm_connector *connector)
348 struct drm_device *dev = connector->dev;
351 /* We shouldn't get called more than once for the same connector */
352 BUG_ON(device_is_registered(&connector->kdev));
354 connector->kdev.parent = &dev->primary->kdev;
355 connector->kdev.class = drm_class;
356 connector->kdev.release = drm_sysfs_device_release;
358 DRM_DEBUG("adding \"%s\" to sysfs\n",
359 drm_get_connector_name(connector));
361 dev_set_name(&connector->kdev, "card%d-%s",
362 dev->primary->index, drm_get_connector_name(connector));
363 ret = device_register(&connector->kdev);
366 DRM_ERROR("failed to register connector device: %d\n", ret);
370 /* Standard attributes */
372 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++) {
373 ret = device_create_file(&connector->kdev, &connector_attrs[i]);
378 /* Optional attributes */
380 * In the long run it maybe a good idea to make one set of
381 * optionals per connector type.
383 switch (connector->connector_type) {
384 case DRM_MODE_CONNECTOR_DVII:
385 case DRM_MODE_CONNECTOR_Composite:
386 case DRM_MODE_CONNECTOR_SVIDEO:
387 case DRM_MODE_CONNECTOR_Component:
388 for (i = 0; i < ARRAY_SIZE(connector_attrs_opt1); i++) {
389 ret = device_create_file(&connector->kdev, &connector_attrs_opt1[i]);
398 ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
402 /* Let userspace know we have a new connector */
403 drm_sysfs_hotplug_event(dev);
409 for (j = 0; j < i; j++)
410 device_remove_file(&connector->kdev,
411 &connector_attrs[i]);
412 device_unregister(&connector->kdev);
417 EXPORT_SYMBOL(drm_sysfs_connector_add);
420 * drm_sysfs_connector_remove - remove an connector device from sysfs
421 * @connector: connector to remove
423 * Remove @connector and its associated attributes from sysfs. Note that
424 * the device model core will take care of sending the "remove" uevent
425 * at this time, so we don't need to do it.
428 * This routine should only be called if the connector was previously
429 * successfully registered. If @connector hasn't been registered yet,
430 * you'll likely see a panic somewhere deep in sysfs code when called.
432 void drm_sysfs_connector_remove(struct drm_connector *connector)
436 DRM_DEBUG("removing \"%s\" from sysfs\n",
437 drm_get_connector_name(connector));
439 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
440 device_remove_file(&connector->kdev, &connector_attrs[i]);
441 sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
442 device_unregister(&connector->kdev);
444 EXPORT_SYMBOL(drm_sysfs_connector_remove);
447 * drm_sysfs_hotplug_event - generate a DRM uevent
450 * Send a uevent for the DRM device specified by @dev. Currently we only
451 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
452 * deal with other types of events.
454 void drm_sysfs_hotplug_event(struct drm_device *dev)
456 char *event_string = "HOTPLUG=1";
457 char *envp[] = { event_string, NULL };
459 DRM_DEBUG("generating hotplug event\n");
461 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
463 EXPORT_SYMBOL(drm_sysfs_hotplug_event);
466 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
467 * @dev: DRM device to be added
468 * @head: DRM head in question
470 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
471 * as the parent for the Linux device, and make sure it has a file containing
472 * the driver we're using (for userspace compatibility).
474 int drm_sysfs_device_add(struct drm_minor *minor)
479 minor->kdev.parent = &minor->dev->pdev->dev;
480 minor->kdev.class = drm_class;
481 minor->kdev.release = drm_sysfs_device_release;
482 minor->kdev.devt = minor->device;
483 if (minor->type == DRM_MINOR_CONTROL)
484 minor_str = "controlD%d";
485 else if (minor->type == DRM_MINOR_RENDER)
486 minor_str = "renderD%d";
488 minor_str = "card%d";
490 dev_set_name(&minor->kdev, minor_str, minor->index);
492 err = device_register(&minor->kdev);
494 DRM_ERROR("device add failed: %d\n", err);
505 * drm_sysfs_device_remove - remove DRM device
506 * @dev: DRM device to remove
508 * This call unregisters and cleans up a class device that was created with a
509 * call to drm_sysfs_device_add()
511 void drm_sysfs_device_remove(struct drm_minor *minor)
513 device_unregister(&minor->kdev);