Commit | Line | Data |
---|---|---|
0650fd58 | 1 | |
1da177e4 LT |
2 | /* |
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. | |
6 | * | |
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. | |
10 | * | |
11 | * This file is released under the GPLv2 | |
12 | * | |
13 | */ | |
14 | ||
1da177e4 LT |
15 | #include <linux/device.h> |
16 | #include <linux/kdev_t.h> | |
5a0e3ad6 | 17 | #include <linux/gfp.h> |
1da177e4 LT |
18 | #include <linux/err.h> |
19 | ||
327c225b | 20 | #include "drm_sysfs.h" |
1da177e4 | 21 | #include "drm_core.h" |
f210973b | 22 | #include "drmP.h" |
1da177e4 | 23 | |
2c14f28b | 24 | #define to_drm_minor(d) container_of(d, struct drm_minor, kdev) |
f453ba04 | 25 | #define to_drm_connector(d) container_of(d, struct drm_connector, kdev) |
e8b962b6 | 26 | |
08e4d534 TH |
27 | static struct device_type drm_sysfs_device_minor = { |
28 | .name = "drm_minor" | |
29 | }; | |
30 | ||
e8b962b6 | 31 | /** |
08e4d534 | 32 | * drm_class_suspend - DRM class suspend hook |
e8b962b6 JB |
33 | * @dev: Linux device to suspend |
34 | * @state: power state to enter | |
35 | * | |
36 | * Just figures out what the actual struct drm_device associated with | |
37 | * @dev is and calls its suspend hook, if present. | |
38 | */ | |
08e4d534 | 39 | static int drm_class_suspend(struct device *dev, pm_message_t state) |
e8b962b6 | 40 | { |
08e4d534 TH |
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; | |
44 | ||
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); | |
49 | } | |
e8b962b6 JB |
50 | return 0; |
51 | } | |
52 | ||
53 | /** | |
08e4d534 | 54 | * drm_class_resume - DRM class resume hook |
e8b962b6 JB |
55 | * @dev: Linux device to resume |
56 | * | |
57 | * Just figures out what the actual struct drm_device associated with | |
58 | * @dev is and calls its resume hook, if present. | |
59 | */ | |
08e4d534 | 60 | static int drm_class_resume(struct device *dev) |
e8b962b6 | 61 | { |
08e4d534 TH |
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; | |
65 | ||
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); | |
70 | } | |
e8b962b6 JB |
71 | return 0; |
72 | } | |
73 | ||
e454cea2 | 74 | static char *drm_devnode(struct device *dev, mode_t *mode) |
02200d06 KS |
75 | { |
76 | return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev)); | |
77 | } | |
78 | ||
0933e2d9 AK |
79 | static CLASS_ATTR_STRING(version, S_IRUGO, |
80 | CORE_NAME " " | |
81 | __stringify(CORE_MAJOR) "." | |
82 | __stringify(CORE_MINOR) "." | |
83 | __stringify(CORE_PATCHLEVEL) " " | |
84 | CORE_DATE); | |
1da177e4 LT |
85 | |
86 | /** | |
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. | |
90 | * | |
e8b962b6 | 91 | * This is used to create DRM class pointer that can then be used |
1da177e4 LT |
92 | * in calls to drm_sysfs_device_add(). |
93 | * | |
94 | * Note, the pointer created here is to be destroyed when finished by making a | |
95 | * call to drm_sysfs_destroy(). | |
96 | */ | |
0650fd58 | 97 | struct class *drm_sysfs_create(struct module *owner, char *name) |
1da177e4 | 98 | { |
0650fd58 | 99 | struct class *class; |
24f73c92 | 100 | int err; |
0650fd58 GKH |
101 | |
102 | class = class_create(owner, name); | |
94f060bd AM |
103 | if (IS_ERR(class)) { |
104 | err = PTR_ERR(class); | |
24f73c92 JG |
105 | goto err_out; |
106 | } | |
107 | ||
08e4d534 TH |
108 | class->suspend = drm_class_suspend; |
109 | class->resume = drm_class_resume; | |
e8b962b6 | 110 | |
0933e2d9 | 111 | err = class_create_file(class, &class_attr_version.attr); |
24f73c92 JG |
112 | if (err) |
113 | goto err_out_class; | |
0650fd58 | 114 | |
e454cea2 | 115 | class->devnode = drm_devnode; |
02200d06 | 116 | |
0650fd58 | 117 | return class; |
24f73c92 JG |
118 | |
119 | err_out_class: | |
120 | class_destroy(class); | |
121 | err_out: | |
122 | return ERR_PTR(err); | |
1da177e4 LT |
123 | } |
124 | ||
125 | /** | |
e8b962b6 | 126 | * drm_sysfs_destroy - destroys DRM class |
1da177e4 | 127 | * |
e8b962b6 | 128 | * Destroy the DRM device class. |
1da177e4 | 129 | */ |
e8b962b6 | 130 | void drm_sysfs_destroy(void) |
1da177e4 | 131 | { |
e8b962b6 | 132 | if ((drm_class == NULL) || (IS_ERR(drm_class))) |
1da177e4 | 133 | return; |
0933e2d9 | 134 | class_remove_file(drm_class, &class_attr_version.attr); |
e8b962b6 | 135 | class_destroy(drm_class); |
1da177e4 LT |
136 | } |
137 | ||
e8b962b6 JB |
138 | /** |
139 | * drm_sysfs_device_release - do nothing | |
140 | * @dev: Linux device | |
141 | * | |
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. | |
145 | */ | |
146 | static void drm_sysfs_device_release(struct device *dev) | |
147 | { | |
77d26dc9 | 148 | memset(dev, 0, sizeof(struct device)); |
e8b962b6 JB |
149 | return; |
150 | } | |
151 | ||
f453ba04 DA |
152 | /* |
153 | * Connector properties | |
154 | */ | |
155 | static ssize_t status_show(struct device *device, | |
156 | struct device_attribute *attr, | |
157 | char *buf) | |
158 | { | |
159 | struct drm_connector *connector = to_drm_connector(device); | |
160 | enum drm_connector_status status; | |
161 | ||
162 | status = connector->funcs->detect(connector); | |
75185c92 | 163 | return snprintf(buf, PAGE_SIZE, "%s\n", |
f453ba04 DA |
164 | drm_get_connector_status_name(status)); |
165 | } | |
166 | ||
167 | static ssize_t dpms_show(struct device *device, | |
168 | struct device_attribute *attr, | |
169 | char *buf) | |
170 | { | |
171 | struct drm_connector *connector = to_drm_connector(device); | |
172 | struct drm_device *dev = connector->dev; | |
173 | uint64_t dpms_status; | |
174 | int ret; | |
175 | ||
176 | ret = drm_connector_property_get_value(connector, | |
177 | dev->mode_config.dpms_property, | |
178 | &dpms_status); | |
179 | if (ret) | |
180 | return 0; | |
181 | ||
75185c92 | 182 | return snprintf(buf, PAGE_SIZE, "%s\n", |
f453ba04 DA |
183 | drm_get_dpms_name((int)dpms_status)); |
184 | } | |
185 | ||
186 | static ssize_t enabled_show(struct device *device, | |
187 | struct device_attribute *attr, | |
188 | char *buf) | |
189 | { | |
190 | struct drm_connector *connector = to_drm_connector(device); | |
191 | ||
75185c92 | 192 | return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" : |
f453ba04 DA |
193 | "disabled"); |
194 | } | |
195 | ||
2c3c8bea CW |
196 | static ssize_t edid_show(struct file *filp, struct kobject *kobj, |
197 | struct bin_attribute *attr, char *buf, loff_t off, | |
198 | size_t count) | |
f453ba04 DA |
199 | { |
200 | struct device *connector_dev = container_of(kobj, struct device, kobj); | |
201 | struct drm_connector *connector = to_drm_connector(connector_dev); | |
202 | unsigned char *edid; | |
203 | size_t size; | |
204 | ||
205 | if (!connector->edid_blob_ptr) | |
206 | return 0; | |
207 | ||
208 | edid = connector->edid_blob_ptr->data; | |
209 | size = connector->edid_blob_ptr->length; | |
210 | if (!edid) | |
211 | return 0; | |
212 | ||
213 | if (off >= size) | |
214 | return 0; | |
215 | ||
216 | if (off + count > size) | |
217 | count = size - off; | |
218 | memcpy(buf, edid + off, count); | |
219 | ||
220 | return count; | |
221 | } | |
222 | ||
223 | static ssize_t modes_show(struct device *device, | |
224 | struct device_attribute *attr, | |
225 | char *buf) | |
226 | { | |
227 | struct drm_connector *connector = to_drm_connector(device); | |
228 | struct drm_display_mode *mode; | |
229 | int written = 0; | |
230 | ||
231 | list_for_each_entry(mode, &connector->modes, head) { | |
232 | written += snprintf(buf + written, PAGE_SIZE - written, "%s\n", | |
233 | mode->name); | |
234 | } | |
235 | ||
236 | return written; | |
237 | } | |
238 | ||
239 | static ssize_t subconnector_show(struct device *device, | |
240 | struct device_attribute *attr, | |
241 | char *buf) | |
242 | { | |
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; | |
247 | int is_tv = 0; | |
248 | int ret; | |
249 | ||
250 | switch (connector->connector_type) { | |
251 | case DRM_MODE_CONNECTOR_DVII: | |
252 | prop = dev->mode_config.dvi_i_subconnector_property; | |
253 | break; | |
254 | case DRM_MODE_CONNECTOR_Composite: | |
255 | case DRM_MODE_CONNECTOR_SVIDEO: | |
256 | case DRM_MODE_CONNECTOR_Component: | |
74bd3c26 | 257 | case DRM_MODE_CONNECTOR_TV: |
f453ba04 DA |
258 | prop = dev->mode_config.tv_subconnector_property; |
259 | is_tv = 1; | |
260 | break; | |
261 | default: | |
262 | DRM_ERROR("Wrong connector type for this property\n"); | |
263 | return 0; | |
264 | } | |
265 | ||
266 | if (!prop) { | |
267 | DRM_ERROR("Unable to find subconnector property\n"); | |
268 | return 0; | |
269 | } | |
270 | ||
271 | ret = drm_connector_property_get_value(connector, prop, &subconnector); | |
272 | if (ret) | |
273 | return 0; | |
274 | ||
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)); | |
278 | } | |
279 | ||
280 | static ssize_t select_subconnector_show(struct device *device, | |
281 | struct device_attribute *attr, | |
282 | char *buf) | |
283 | { | |
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; | |
288 | int is_tv = 0; | |
289 | int ret; | |
290 | ||
291 | switch (connector->connector_type) { | |
292 | case DRM_MODE_CONNECTOR_DVII: | |
293 | prop = dev->mode_config.dvi_i_select_subconnector_property; | |
294 | break; | |
295 | case DRM_MODE_CONNECTOR_Composite: | |
296 | case DRM_MODE_CONNECTOR_SVIDEO: | |
297 | case DRM_MODE_CONNECTOR_Component: | |
74bd3c26 | 298 | case DRM_MODE_CONNECTOR_TV: |
f453ba04 DA |
299 | prop = dev->mode_config.tv_select_subconnector_property; |
300 | is_tv = 1; | |
301 | break; | |
302 | default: | |
303 | DRM_ERROR("Wrong connector type for this property\n"); | |
304 | return 0; | |
305 | } | |
306 | ||
307 | if (!prop) { | |
308 | DRM_ERROR("Unable to find select subconnector property\n"); | |
309 | return 0; | |
310 | } | |
311 | ||
312 | ret = drm_connector_property_get_value(connector, prop, &subconnector); | |
313 | if (ret) | |
314 | return 0; | |
315 | ||
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)); | |
319 | } | |
320 | ||
321 | static struct device_attribute connector_attrs[] = { | |
322 | __ATTR_RO(status), | |
323 | __ATTR_RO(enabled), | |
324 | __ATTR_RO(dpms), | |
325 | __ATTR_RO(modes), | |
326 | }; | |
327 | ||
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), | |
332 | }; | |
333 | ||
334 | static struct bin_attribute edid_attr = { | |
335 | .attr.name = "edid", | |
e36ebaf4 | 336 | .attr.mode = 0444, |
7466f4cc | 337 | .size = 0, |
f453ba04 DA |
338 | .read = edid_show, |
339 | }; | |
340 | ||
341 | /** | |
342 | * drm_sysfs_connector_add - add an connector to sysfs | |
343 | * @connector: connector to add | |
344 | * | |
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 | |
348 | * available. | |
349 | * | |
350 | * Note: | |
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 | |
353 | * below. | |
354 | */ | |
355 | int drm_sysfs_connector_add(struct drm_connector *connector) | |
356 | { | |
357 | struct drm_device *dev = connector->dev; | |
a1c4560d DC |
358 | int attr_cnt = 0; |
359 | int opt_cnt = 0; | |
360 | int i; | |
361 | int ret = 0; | |
f453ba04 DA |
362 | |
363 | /* We shouldn't get called more than once for the same connector */ | |
364 | BUG_ON(device_is_registered(&connector->kdev)); | |
365 | ||
366 | connector->kdev.parent = &dev->primary->kdev; | |
367 | connector->kdev.class = drm_class; | |
368 | connector->kdev.release = drm_sysfs_device_release; | |
369 | ||
370 | DRM_DEBUG("adding \"%s\" to sysfs\n", | |
371 | drm_get_connector_name(connector)); | |
372 | ||
2ead054c KS |
373 | dev_set_name(&connector->kdev, "card%d-%s", |
374 | dev->primary->index, drm_get_connector_name(connector)); | |
f453ba04 DA |
375 | ret = device_register(&connector->kdev); |
376 | ||
377 | if (ret) { | |
378 | DRM_ERROR("failed to register connector device: %d\n", ret); | |
379 | goto out; | |
380 | } | |
381 | ||
382 | /* Standard attributes */ | |
383 | ||
a1c4560d DC |
384 | for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) { |
385 | ret = device_create_file(&connector->kdev, &connector_attrs[attr_cnt]); | |
f453ba04 DA |
386 | if (ret) |
387 | goto err_out_files; | |
388 | } | |
389 | ||
390 | /* Optional attributes */ | |
391 | /* | |
392 | * In the long run it maybe a good idea to make one set of | |
393 | * optionals per connector type. | |
394 | */ | |
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: | |
74bd3c26 | 400 | case DRM_MODE_CONNECTOR_TV: |
a1c4560d DC |
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]); | |
f453ba04 DA |
403 | if (ret) |
404 | goto err_out_files; | |
405 | } | |
406 | break; | |
407 | default: | |
408 | break; | |
409 | } | |
410 | ||
411 | ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr); | |
412 | if (ret) | |
413 | goto err_out_files; | |
414 | ||
415 | /* Let userspace know we have a new connector */ | |
416 | drm_sysfs_hotplug_event(dev); | |
417 | ||
418 | return 0; | |
419 | ||
420 | err_out_files: | |
a1c4560d DC |
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]); | |
f453ba04 DA |
425 | device_unregister(&connector->kdev); |
426 | ||
427 | out: | |
428 | return ret; | |
429 | } | |
430 | EXPORT_SYMBOL(drm_sysfs_connector_add); | |
431 | ||
432 | /** | |
433 | * drm_sysfs_connector_remove - remove an connector device from sysfs | |
434 | * @connector: connector to remove | |
435 | * | |
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. | |
439 | * | |
440 | * Note: | |
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. | |
444 | */ | |
445 | void drm_sysfs_connector_remove(struct drm_connector *connector) | |
446 | { | |
447 | int i; | |
448 | ||
449 | DRM_DEBUG("removing \"%s\" from sysfs\n", | |
450 | drm_get_connector_name(connector)); | |
451 | ||
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); | |
456 | } | |
457 | EXPORT_SYMBOL(drm_sysfs_connector_remove); | |
458 | ||
459 | /** | |
460 | * drm_sysfs_hotplug_event - generate a DRM uevent | |
461 | * @dev: DRM device | |
462 | * | |
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. | |
466 | */ | |
467 | void drm_sysfs_hotplug_event(struct drm_device *dev) | |
468 | { | |
469 | char *event_string = "HOTPLUG=1"; | |
470 | char *envp[] = { event_string, NULL }; | |
471 | ||
472 | DRM_DEBUG("generating hotplug event\n"); | |
473 | ||
474 | kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp); | |
475 | } | |
5ca58282 | 476 | EXPORT_SYMBOL(drm_sysfs_hotplug_event); |
f453ba04 | 477 | |
1da177e4 LT |
478 | /** |
479 | * drm_sysfs_device_add - adds a class device to sysfs for a character driver | |
e8b962b6 JB |
480 | * @dev: DRM device to be added |
481 | * @head: DRM head in question | |
1da177e4 | 482 | * |
e8b962b6 JB |
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). | |
1da177e4 | 486 | */ |
2c14f28b | 487 | int drm_sysfs_device_add(struct drm_minor *minor) |
1da177e4 | 488 | { |
e8b962b6 | 489 | int err; |
2c14f28b | 490 | char *minor_str; |
e8b962b6 | 491 | |
dcdb1674 JC |
492 | minor->kdev.parent = minor->dev->dev; |
493 | ||
2c14f28b DA |
494 | minor->kdev.class = drm_class; |
495 | minor->kdev.release = drm_sysfs_device_release; | |
496 | minor->kdev.devt = minor->device; | |
08e4d534 | 497 | minor->kdev.type = &drm_sysfs_device_minor; |
f453ba04 DA |
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"; | |
502 | else | |
503 | minor_str = "card%d"; | |
e8b962b6 | 504 | |
8f4bbd9f | 505 | dev_set_name(&minor->kdev, minor_str, minor->index); |
2c14f28b DA |
506 | |
507 | err = device_register(&minor->kdev); | |
e8b962b6 JB |
508 | if (err) { |
509 | DRM_ERROR("device add failed: %d\n", err); | |
24f73c92 JG |
510 | goto err_out; |
511 | } | |
1da177e4 | 512 | |
e8b962b6 | 513 | return 0; |
24f73c92 | 514 | |
24f73c92 | 515 | err_out: |
e8b962b6 | 516 | return err; |
1da177e4 LT |
517 | } |
518 | ||
519 | /** | |
e8b962b6 JB |
520 | * drm_sysfs_device_remove - remove DRM device |
521 | * @dev: DRM device to remove | |
1da177e4 LT |
522 | * |
523 | * This call unregisters and cleans up a class device that was created with a | |
524 | * call to drm_sysfs_device_add() | |
525 | */ | |
2c14f28b | 526 | void drm_sysfs_device_remove(struct drm_minor *minor) |
1da177e4 | 527 | { |
2c14f28b | 528 | device_unregister(&minor->kdev); |
1da177e4 | 529 | } |
327c225b TH |
530 | |
531 | ||
532 | /** | |
533 | * drm_class_device_register - Register a struct device in the drm class. | |
534 | * | |
535 | * @dev: pointer to struct device to register. | |
536 | * | |
537 | * @dev should have all relevant members pre-filled with the exception | |
538 | * of the class member. In particular, the device_type member must | |
539 | * be set. | |
540 | */ | |
541 | ||
542 | int drm_class_device_register(struct device *dev) | |
543 | { | |
544 | dev->class = drm_class; | |
545 | return device_register(dev); | |
546 | } | |
547 | EXPORT_SYMBOL_GPL(drm_class_device_register); | |
548 | ||
549 | void drm_class_device_unregister(struct device *dev) | |
550 | { | |
551 | return device_unregister(dev); | |
552 | } | |
553 | EXPORT_SYMBOL_GPL(drm_class_device_unregister); |