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>
24 #include "drm_internal.h"
26 #define to_drm_minor(d) dev_get_drvdata(d)
27 #define to_drm_connector(d) dev_get_drvdata(d)
29 static struct device_type drm_sysfs_device_minor = {
34 * __drm_class_suspend - internal DRM class suspend routine
35 * @dev: Linux device to suspend
36 * @state: power state to enter
38 * Just figures out what the actual struct drm_device associated with
39 * @dev is and calls its suspend hook, if present.
41 static int __drm_class_suspend(struct device *dev, pm_message_t state)
43 if (dev->type == &drm_sysfs_device_minor) {
44 struct drm_minor *drm_minor = to_drm_minor(dev);
45 struct drm_device *drm_dev = drm_minor->dev;
47 if (drm_minor->type == DRM_MINOR_LEGACY &&
48 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
49 drm_dev->driver->suspend)
50 return drm_dev->driver->suspend(drm_dev, state);
56 * drm_class_suspend - internal DRM class suspend hook. Simply calls
57 * __drm_class_suspend() with the correct pm state.
58 * @dev: Linux device to suspend
60 static int drm_class_suspend(struct device *dev)
62 return __drm_class_suspend(dev, PMSG_SUSPEND);
66 * drm_class_freeze - internal DRM class freeze hook. Simply calls
67 * __drm_class_suspend() with the correct pm state.
68 * @dev: Linux device to freeze
70 static int drm_class_freeze(struct device *dev)
72 return __drm_class_suspend(dev, PMSG_FREEZE);
76 * drm_class_resume - DRM class resume hook
77 * @dev: Linux device to resume
79 * Just figures out what the actual struct drm_device associated with
80 * @dev is and calls its resume hook, if present.
82 static int drm_class_resume(struct device *dev)
84 if (dev->type == &drm_sysfs_device_minor) {
85 struct drm_minor *drm_minor = to_drm_minor(dev);
86 struct drm_device *drm_dev = drm_minor->dev;
88 if (drm_minor->type == DRM_MINOR_LEGACY &&
89 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
90 drm_dev->driver->resume)
91 return drm_dev->driver->resume(drm_dev);
96 static const struct dev_pm_ops drm_class_dev_pm_ops = {
97 .suspend = drm_class_suspend,
98 .resume = drm_class_resume,
99 .freeze = drm_class_freeze,
102 static char *drm_devnode(struct device *dev, umode_t *mode)
104 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
107 static CLASS_ATTR_STRING(version, S_IRUGO,
109 __stringify(CORE_MAJOR) "."
110 __stringify(CORE_MINOR) "."
111 __stringify(CORE_PATCHLEVEL) " "
115 * drm_sysfs_create - create a struct drm_sysfs_class structure
116 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
117 * @name: pointer to a string for the name of this class.
119 * This is used to create DRM class pointer that can then be used
120 * in calls to drm_sysfs_device_add().
122 * Note, the pointer created here is to be destroyed when finished by making a
123 * call to drm_sysfs_destroy().
125 struct class *drm_sysfs_create(struct module *owner, char *name)
130 class = class_create(owner, name);
132 err = PTR_ERR(class);
136 class->pm = &drm_class_dev_pm_ops;
138 err = class_create_file(class, &class_attr_version.attr);
142 class->devnode = drm_devnode;
147 class_destroy(class);
153 * drm_sysfs_destroy - destroys DRM class
155 * Destroy the DRM device class.
157 void drm_sysfs_destroy(void)
159 if ((drm_class == NULL) || (IS_ERR(drm_class)))
161 class_remove_file(drm_class, &class_attr_version.attr);
162 class_destroy(drm_class);
167 * Connector properties
169 static ssize_t status_show(struct device *device,
170 struct device_attribute *attr,
173 struct drm_connector *connector = to_drm_connector(device);
174 enum drm_connector_status status;
177 ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
181 status = connector->funcs->detect(connector, true);
182 mutex_unlock(&connector->dev->mode_config.mutex);
184 return snprintf(buf, PAGE_SIZE, "%s\n",
185 drm_get_connector_status_name(status));
188 static ssize_t dpms_show(struct device *device,
189 struct device_attribute *attr,
192 struct drm_connector *connector = to_drm_connector(device);
193 struct drm_device *dev = connector->dev;
194 uint64_t dpms_status;
197 ret = drm_object_property_get_value(&connector->base,
198 dev->mode_config.dpms_property,
203 return snprintf(buf, PAGE_SIZE, "%s\n",
204 drm_get_dpms_name((int)dpms_status));
207 static ssize_t enabled_show(struct device *device,
208 struct device_attribute *attr,
211 struct drm_connector *connector = to_drm_connector(device);
213 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
217 static ssize_t edid_show(struct file *filp, struct kobject *kobj,
218 struct bin_attribute *attr, char *buf, loff_t off,
221 struct device *connector_dev = container_of(kobj, struct device, kobj);
222 struct drm_connector *connector = to_drm_connector(connector_dev);
226 if (!connector->edid_blob_ptr)
229 edid = connector->edid_blob_ptr->data;
230 size = connector->edid_blob_ptr->length;
237 if (off + count > size)
239 memcpy(buf, edid + off, count);
244 static ssize_t modes_show(struct device *device,
245 struct device_attribute *attr,
248 struct drm_connector *connector = to_drm_connector(device);
249 struct drm_display_mode *mode;
252 list_for_each_entry(mode, &connector->modes, head) {
253 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
260 static ssize_t subconnector_show(struct device *device,
261 struct device_attribute *attr,
264 struct drm_connector *connector = to_drm_connector(device);
265 struct drm_device *dev = connector->dev;
266 struct drm_property *prop = NULL;
267 uint64_t subconnector;
271 switch (connector->connector_type) {
272 case DRM_MODE_CONNECTOR_DVII:
273 prop = dev->mode_config.dvi_i_subconnector_property;
275 case DRM_MODE_CONNECTOR_Composite:
276 case DRM_MODE_CONNECTOR_SVIDEO:
277 case DRM_MODE_CONNECTOR_Component:
278 case DRM_MODE_CONNECTOR_TV:
279 prop = dev->mode_config.tv_subconnector_property;
283 DRM_ERROR("Wrong connector type for this property\n");
288 DRM_ERROR("Unable to find subconnector property\n");
292 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
296 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
297 drm_get_tv_subconnector_name((int)subconnector) :
298 drm_get_dvi_i_subconnector_name((int)subconnector));
301 static ssize_t select_subconnector_show(struct device *device,
302 struct device_attribute *attr,
305 struct drm_connector *connector = to_drm_connector(device);
306 struct drm_device *dev = connector->dev;
307 struct drm_property *prop = NULL;
308 uint64_t subconnector;
312 switch (connector->connector_type) {
313 case DRM_MODE_CONNECTOR_DVII:
314 prop = dev->mode_config.dvi_i_select_subconnector_property;
316 case DRM_MODE_CONNECTOR_Composite:
317 case DRM_MODE_CONNECTOR_SVIDEO:
318 case DRM_MODE_CONNECTOR_Component:
319 case DRM_MODE_CONNECTOR_TV:
320 prop = dev->mode_config.tv_select_subconnector_property;
324 DRM_ERROR("Wrong connector type for this property\n");
329 DRM_ERROR("Unable to find select subconnector property\n");
333 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
337 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
338 drm_get_tv_select_name((int)subconnector) :
339 drm_get_dvi_i_select_name((int)subconnector));
342 static DEVICE_ATTR_RO(status);
343 static DEVICE_ATTR_RO(enabled);
344 static DEVICE_ATTR_RO(dpms);
345 static DEVICE_ATTR_RO(modes);
347 static struct attribute *connector_dev_attrs[] = {
348 &dev_attr_status.attr,
349 &dev_attr_enabled.attr,
351 &dev_attr_modes.attr,
355 /* These attributes are for both DVI-I connectors and all types of tv-out. */
356 static DEVICE_ATTR_RO(subconnector);
357 static DEVICE_ATTR_RO(select_subconnector);
359 static struct attribute *connector_opt_dev_attrs[] = {
360 &dev_attr_subconnector.attr,
361 &dev_attr_select_subconnector.attr,
365 static umode_t connector_opt_dev_is_visible(struct kobject *kobj,
366 struct attribute *attr, int idx)
368 struct device *dev = kobj_to_dev(kobj);
369 struct drm_connector *connector = to_drm_connector(dev);
372 * In the long run it maybe a good idea to make one set of
373 * optionals per connector type.
375 switch (connector->connector_type) {
376 case DRM_MODE_CONNECTOR_DVII:
377 case DRM_MODE_CONNECTOR_Composite:
378 case DRM_MODE_CONNECTOR_SVIDEO:
379 case DRM_MODE_CONNECTOR_Component:
380 case DRM_MODE_CONNECTOR_TV:
387 static struct bin_attribute edid_attr = {
394 static struct bin_attribute *connector_bin_attrs[] = {
399 static const struct attribute_group connector_dev_group = {
400 .attrs = connector_dev_attrs,
401 .bin_attrs = connector_bin_attrs,
404 static const struct attribute_group connector_opt_dev_group = {
405 .attrs = connector_opt_dev_attrs,
406 .is_visible = connector_opt_dev_is_visible,
409 static const struct attribute_group *connector_dev_groups[] = {
410 &connector_dev_group,
411 &connector_opt_dev_group,
416 * drm_sysfs_connector_add - add a connector to sysfs
417 * @connector: connector to add
419 * Create a connector device in sysfs, along with its associated connector
420 * properties (so far, connection status, dpms, mode list & edid) and
421 * generate a hotplug event so userspace knows there's a new connector
424 int drm_sysfs_connector_add(struct drm_connector *connector)
426 struct drm_device *dev = connector->dev;
432 device_create_with_groups(drm_class, dev->primary->kdev, 0,
433 connector, connector_dev_groups,
434 "card%d-%s", dev->primary->index,
436 DRM_DEBUG("adding \"%s\" to sysfs\n",
439 if (IS_ERR(connector->kdev)) {
440 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
441 return PTR_ERR(connector->kdev);
444 /* Let userspace know we have a new connector */
445 drm_sysfs_hotplug_event(dev);
451 * drm_sysfs_connector_remove - remove an connector device from sysfs
452 * @connector: connector to remove
454 * Remove @connector and its associated attributes from sysfs. Note that
455 * the device model core will take care of sending the "remove" uevent
456 * at this time, so we don't need to do it.
459 * This routine should only be called if the connector was previously
460 * successfully registered. If @connector hasn't been registered yet,
461 * you'll likely see a panic somewhere deep in sysfs code when called.
463 void drm_sysfs_connector_remove(struct drm_connector *connector)
465 if (!connector->kdev)
467 DRM_DEBUG("removing \"%s\" from sysfs\n",
470 device_unregister(connector->kdev);
471 connector->kdev = NULL;
475 * drm_sysfs_hotplug_event - generate a DRM uevent
478 * Send a uevent for the DRM device specified by @dev. Currently we only
479 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
480 * deal with other types of events.
482 void drm_sysfs_hotplug_event(struct drm_device *dev)
484 char *event_string = "HOTPLUG=1";
485 char *envp[] = { event_string, NULL };
487 DRM_DEBUG("generating hotplug event\n");
489 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
491 EXPORT_SYMBOL(drm_sysfs_hotplug_event);
493 static void drm_sysfs_release(struct device *dev)
499 * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
500 * @minor: minor to allocate sysfs device for
502 * This allocates a new sysfs device for @minor and returns it. The device is
503 * not registered nor linked. The caller has to use device_add() and
504 * device_del() to register and unregister it.
506 * Note that dev_get_drvdata() on the new device will return the minor.
507 * However, the device does not hold a ref-count to the minor nor to the
508 * underlying drm_device. This is unproblematic as long as you access the
509 * private data only in sysfs callbacks. device_del() disables those
510 * synchronously, so they cannot be called after you cleanup a minor.
512 struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
514 const char *minor_str;
518 if (minor->type == DRM_MINOR_CONTROL)
519 minor_str = "controlD%d";
520 else if (minor->type == DRM_MINOR_RENDER)
521 minor_str = "renderD%d";
523 minor_str = "card%d";
525 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
527 return ERR_PTR(-ENOMEM);
529 device_initialize(kdev);
530 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
531 kdev->class = drm_class;
532 kdev->type = &drm_sysfs_device_minor;
533 kdev->parent = minor->dev->dev;
534 kdev->release = drm_sysfs_release;
535 dev_set_drvdata(kdev, minor);
537 r = dev_set_name(kdev, minor_str, minor->index);
549 * drm_class_device_register - Register a struct device in the drm class.
551 * @dev: pointer to struct device to register.
553 * @dev should have all relevant members pre-filled with the exception
554 * of the class member. In particular, the device_type member must
558 int drm_class_device_register(struct device *dev)
560 if (!drm_class || IS_ERR(drm_class))
563 dev->class = drm_class;
564 return device_register(dev);
566 EXPORT_SYMBOL_GPL(drm_class_device_register);
568 void drm_class_device_unregister(struct device *dev)
570 return device_unregister(dev);
572 EXPORT_SYMBOL_GPL(drm_class_device_unregister);