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1// SPDX-License-Identifier: GPL-2.0-only
2
3/*
4 * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
5 * extra sysfs attribute from DRM. Normal drm_sysfs_class
6 * does not allow adding attributes.
7 *
8 * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
9 * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
10 * Copyright (c) 2003-2004 IBM Corp.
11 */
12
13#include <linux/device.h>
14#include <linux/err.h>
15#include <linux/export.h>
16#include <linux/gfp.h>
17#include <linux/i2c.h>
18#include <linux/kdev_t.h>
19#include <linux/slab.h>
20
21#include <drm/drm_connector.h>
22#include <drm/drm_device.h>
23#include <drm/drm_file.h>
24#include <drm/drm_modes.h>
25#include <drm/drm_print.h>
26#include <drm/drm_property.h>
27#include <drm/drm_sysfs.h>
28
29#include "drm_internal.h"
30#include "drm_crtc_internal.h"
31
32#define to_drm_minor(d) dev_get_drvdata(d)
33#define to_drm_connector(d) dev_get_drvdata(d)
34
35/**
36 * DOC: overview
37 *
38 * DRM provides very little additional support to drivers for sysfs
39 * interactions, beyond just all the standard stuff. Drivers who want to expose
40 * additional sysfs properties and property groups can attach them at either
41 * &drm_device.dev or &drm_connector.kdev.
42 *
43 * Registration is automatically handled when calling drm_dev_register(), or
44 * drm_connector_register() in case of hot-plugged connectors. Unregistration is
45 * also automatically handled by drm_dev_unregister() and
46 * drm_connector_unregister().
47 */
48
49static struct device_type drm_sysfs_device_minor = {
50 .name = "drm_minor"
51};
52
53struct class *drm_class;
54
55static char *drm_devnode(struct device *dev, umode_t *mode)
56{
57 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
58}
59
60static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
61
62/**
63 * drm_sysfs_init - initialize sysfs helpers
64 *
65 * This is used to create the DRM class, which is the implicit parent of any
66 * other top-level DRM sysfs objects.
67 *
68 * You must call drm_sysfs_destroy() to release the allocated resources.
69 *
70 * Return: 0 on success, negative error code on failure.
71 */
72int drm_sysfs_init(void)
73{
74 int err;
75
76 drm_class = class_create(THIS_MODULE, "drm");
77 if (IS_ERR(drm_class))
78 return PTR_ERR(drm_class);
79
80 err = class_create_file(drm_class, &class_attr_version.attr);
81 if (err) {
82 class_destroy(drm_class);
83 drm_class = NULL;
84 return err;
85 }
86
87 drm_class->devnode = drm_devnode;
88 drm_setup_hdcp_srm(drm_class);
89 return 0;
90}
91
92/**
93 * drm_sysfs_destroy - destroys DRM class
94 *
95 * Destroy the DRM device class.
96 */
97void drm_sysfs_destroy(void)
98{
99 if (IS_ERR_OR_NULL(drm_class))
100 return;
101 drm_teardown_hdcp_srm(drm_class);
102 class_remove_file(drm_class, &class_attr_version.attr);
103 class_destroy(drm_class);
104 drm_class = NULL;
105}
106
107/*
108 * Connector properties
109 */
110static ssize_t status_store(struct device *device,
111 struct device_attribute *attr,
112 const char *buf, size_t count)
113{
114 struct drm_connector *connector = to_drm_connector(device);
115 struct drm_device *dev = connector->dev;
116 enum drm_connector_force old_force;
117 int ret;
118
119 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
120 if (ret)
121 return ret;
122
123 old_force = connector->force;
124
125 if (sysfs_streq(buf, "detect"))
126 connector->force = 0;
127 else if (sysfs_streq(buf, "on"))
128 connector->force = DRM_FORCE_ON;
129 else if (sysfs_streq(buf, "on-digital"))
130 connector->force = DRM_FORCE_ON_DIGITAL;
131 else if (sysfs_streq(buf, "off"))
132 connector->force = DRM_FORCE_OFF;
133 else
134 ret = -EINVAL;
135
136 if (old_force != connector->force || !connector->force) {
137 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
138 connector->base.id,
139 connector->name,
140 old_force, connector->force);
141
142 connector->funcs->fill_modes(connector,
143 dev->mode_config.max_width,
144 dev->mode_config.max_height);
145 }
146
147 mutex_unlock(&dev->mode_config.mutex);
148
149 return ret ? ret : count;
150}
151
152static ssize_t status_show(struct device *device,
153 struct device_attribute *attr,
154 char *buf)
155{
156 struct drm_connector *connector = to_drm_connector(device);
157 enum drm_connector_status status;
158
159 status = READ_ONCE(connector->status);
160
161 return snprintf(buf, PAGE_SIZE, "%s\n",
162 drm_get_connector_status_name(status));
163}
164
165static ssize_t dpms_show(struct device *device,
166 struct device_attribute *attr,
167 char *buf)
168{
169 struct drm_connector *connector = to_drm_connector(device);
170 int dpms;
171
172 dpms = READ_ONCE(connector->dpms);
173
174 return snprintf(buf, PAGE_SIZE, "%s\n",
175 drm_get_dpms_name(dpms));
176}
177
178static ssize_t enabled_show(struct device *device,
179 struct device_attribute *attr,
180 char *buf)
181{
182 struct drm_connector *connector = to_drm_connector(device);
183 bool enabled;
184
185 enabled = READ_ONCE(connector->encoder);
186
187 return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n");
188}
189
190static ssize_t edid_show(struct file *filp, struct kobject *kobj,
191 struct bin_attribute *attr, char *buf, loff_t off,
192 size_t count)
193{
194 struct device *connector_dev = kobj_to_dev(kobj);
195 struct drm_connector *connector = to_drm_connector(connector_dev);
196 unsigned char *edid;
197 size_t size;
198 ssize_t ret = 0;
199
200 mutex_lock(&connector->dev->mode_config.mutex);
201 if (!connector->edid_blob_ptr)
202 goto unlock;
203
204 edid = connector->edid_blob_ptr->data;
205 size = connector->edid_blob_ptr->length;
206 if (!edid)
207 goto unlock;
208
209 if (off >= size)
210 goto unlock;
211
212 if (off + count > size)
213 count = size - off;
214 memcpy(buf, edid + off, count);
215
216 ret = count;
217unlock:
218 mutex_unlock(&connector->dev->mode_config.mutex);
219
220 return ret;
221}
222
223static 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 mutex_lock(&connector->dev->mode_config.mutex);
232 list_for_each_entry(mode, &connector->modes, head) {
233 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
234 mode->name);
235 }
236 mutex_unlock(&connector->dev->mode_config.mutex);
237
238 return written;
239}
240
241static DEVICE_ATTR_RW(status);
242static DEVICE_ATTR_RO(enabled);
243static DEVICE_ATTR_RO(dpms);
244static DEVICE_ATTR_RO(modes);
245
246static struct attribute *connector_dev_attrs[] = {
247 &dev_attr_status.attr,
248 &dev_attr_enabled.attr,
249 &dev_attr_dpms.attr,
250 &dev_attr_modes.attr,
251 NULL
252};
253
254static struct bin_attribute edid_attr = {
255 .attr.name = "edid",
256 .attr.mode = 0444,
257 .size = 0,
258 .read = edid_show,
259};
260
261static struct bin_attribute *connector_bin_attrs[] = {
262 &edid_attr,
263 NULL
264};
265
266static const struct attribute_group connector_dev_group = {
267 .attrs = connector_dev_attrs,
268 .bin_attrs = connector_bin_attrs,
269};
270
271static const struct attribute_group *connector_dev_groups[] = {
272 &connector_dev_group,
273 NULL
274};
275
276int drm_sysfs_connector_add(struct drm_connector *connector)
277{
278 struct drm_device *dev = connector->dev;
279
280 if (connector->kdev)
281 return 0;
282
283 connector->kdev =
284 device_create_with_groups(drm_class, dev->primary->kdev, 0,
285 connector, connector_dev_groups,
286 "card%d-%s", dev->primary->index,
287 connector->name);
288 DRM_DEBUG("adding \"%s\" to sysfs\n",
289 connector->name);
290
291 if (IS_ERR(connector->kdev)) {
292 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
293 return PTR_ERR(connector->kdev);
294 }
295
296 /* Let userspace know we have a new connector */
297 drm_sysfs_hotplug_event(dev);
298
299 if (connector->ddc)
300 return sysfs_create_link(&connector->kdev->kobj,
301 &connector->ddc->dev.kobj, "ddc");
302 return 0;
303}
304
305void drm_sysfs_connector_remove(struct drm_connector *connector)
306{
307 if (!connector->kdev)
308 return;
309
310 if (connector->ddc)
311 sysfs_remove_link(&connector->kdev->kobj, "ddc");
312
313 DRM_DEBUG("removing \"%s\" from sysfs\n",
314 connector->name);
315
316 device_unregister(connector->kdev);
317 connector->kdev = NULL;
318}
319
320void drm_sysfs_lease_event(struct drm_device *dev)
321{
322 char *event_string = "LEASE=1";
323 char *envp[] = { event_string, NULL };
324
325 DRM_DEBUG("generating lease event\n");
326
327 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
328}
329
330/**
331 * drm_sysfs_hotplug_event - generate a DRM uevent
332 * @dev: DRM device
333 *
334 * Send a uevent for the DRM device specified by @dev. Currently we only
335 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
336 * deal with other types of events.
337 *
338 * Any new uapi should be using the drm_sysfs_connector_status_event()
339 * for uevents on connector status change.
340 */
341void drm_sysfs_hotplug_event(struct drm_device *dev)
342{
343 char *event_string = "HOTPLUG=1";
344 char *envp[] = { event_string, NULL };
345
346 DRM_DEBUG("generating hotplug event\n");
347
348 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
349}
350EXPORT_SYMBOL(drm_sysfs_hotplug_event);
351
352/**
353 * drm_sysfs_connector_status_event - generate a DRM uevent for connector
354 * property status change
355 * @connector: connector on which property status changed
356 * @property: connector property whose status changed.
357 *
358 * Send a uevent for the DRM device specified by @dev. Currently we
359 * set HOTPLUG=1 and connector id along with the attached property id
360 * related to the status change.
361 */
362void drm_sysfs_connector_status_event(struct drm_connector *connector,
363 struct drm_property *property)
364{
365 struct drm_device *dev = connector->dev;
366 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
367 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
368
369 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
370 property->base.id));
371
372 snprintf(conn_id, ARRAY_SIZE(conn_id),
373 "CONNECTOR=%u", connector->base.id);
374 snprintf(prop_id, ARRAY_SIZE(prop_id),
375 "PROPERTY=%u", property->base.id);
376
377 DRM_DEBUG("generating connector status event\n");
378
379 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
380}
381EXPORT_SYMBOL(drm_sysfs_connector_status_event);
382
383static void drm_sysfs_release(struct device *dev)
384{
385 kfree(dev);
386}
387
388struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
389{
390 const char *minor_str;
391 struct device *kdev;
392 int r;
393
394 if (minor->type == DRM_MINOR_RENDER)
395 minor_str = "renderD%d";
396 else
397 minor_str = "card%d";
398
399 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
400 if (!kdev)
401 return ERR_PTR(-ENOMEM);
402
403 device_initialize(kdev);
404 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
405 kdev->class = drm_class;
406 kdev->type = &drm_sysfs_device_minor;
407 kdev->parent = minor->dev->dev;
408 kdev->release = drm_sysfs_release;
409 dev_set_drvdata(kdev, minor);
410
411 r = dev_set_name(kdev, minor_str, minor->index);
412 if (r < 0)
413 goto err_free;
414
415 return kdev;
416
417err_free:
418 put_device(kdev);
419 return ERR_PTR(r);
420}
421
422/**
423 * drm_class_device_register - register new device with the DRM sysfs class
424 * @dev: device to register
425 *
426 * Registers a new &struct device within the DRM sysfs class. Essentially only
427 * used by ttm to have a place for its global settings. Drivers should never use
428 * this.
429 */
430int drm_class_device_register(struct device *dev)
431{
432 if (!drm_class || IS_ERR(drm_class))
433 return -ENOENT;
434
435 dev->class = drm_class;
436 return device_register(dev);
437}
438EXPORT_SYMBOL_GPL(drm_class_device_register);
439
440/**
441 * drm_class_device_unregister - unregister device with the DRM sysfs class
442 * @dev: device to unregister
443 *
444 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
445 * by ttm to have a place for its global settings. Drivers should never use
446 * this.
447 */
448void drm_class_device_unregister(struct device *dev)
449{
450 return device_unregister(dev);
451}
452EXPORT_SYMBOL_GPL(drm_class_device_unregister);
1
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
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>
20
21#include <drm/drm_sysfs.h>
22#include <drm/drmP.h>
23#include "drm_internal.h"
24
25#define to_drm_minor(d) dev_get_drvdata(d)
26#define to_drm_connector(d) dev_get_drvdata(d)
27
28/**
29 * DOC: overview
30 *
31 * DRM provides very little additional support to drivers for sysfs
32 * interactions, beyond just all the standard stuff. Drivers who want to expose
33 * additional sysfs properties and property groups can attach them at either
34 * &drm_device.dev or &drm_connector.kdev.
35 *
36 * Registration is automatically handled when calling drm_dev_register(), or
37 * drm_connector_register() in case of hot-plugged connectors. Unregistration is
38 * also automatically handled by drm_dev_unregister() and
39 * drm_connector_unregister().
40 */
41
42static struct device_type drm_sysfs_device_minor = {
43 .name = "drm_minor"
44};
45
46struct class *drm_class;
47
48static char *drm_devnode(struct device *dev, umode_t *mode)
49{
50 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
51}
52
53static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
54
55/**
56 * drm_sysfs_init - initialize sysfs helpers
57 *
58 * This is used to create the DRM class, which is the implicit parent of any
59 * other top-level DRM sysfs objects.
60 *
61 * You must call drm_sysfs_destroy() to release the allocated resources.
62 *
63 * Return: 0 on success, negative error code on failure.
64 */
65int drm_sysfs_init(void)
66{
67 int err;
68
69 drm_class = class_create(THIS_MODULE, "drm");
70 if (IS_ERR(drm_class))
71 return PTR_ERR(drm_class);
72
73 err = class_create_file(drm_class, &class_attr_version.attr);
74 if (err) {
75 class_destroy(drm_class);
76 drm_class = NULL;
77 return err;
78 }
79
80 drm_class->devnode = drm_devnode;
81 return 0;
82}
83
84/**
85 * drm_sysfs_destroy - destroys DRM class
86 *
87 * Destroy the DRM device class.
88 */
89void drm_sysfs_destroy(void)
90{
91 if (IS_ERR_OR_NULL(drm_class))
92 return;
93 class_remove_file(drm_class, &class_attr_version.attr);
94 class_destroy(drm_class);
95 drm_class = NULL;
96}
97
98/*
99 * Connector properties
100 */
101static ssize_t status_store(struct device *device,
102 struct device_attribute *attr,
103 const char *buf, size_t count)
104{
105 struct drm_connector *connector = to_drm_connector(device);
106 struct drm_device *dev = connector->dev;
107 enum drm_connector_force old_force;
108 int ret;
109
110 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
111 if (ret)
112 return ret;
113
114 old_force = connector->force;
115
116 if (sysfs_streq(buf, "detect"))
117 connector->force = 0;
118 else if (sysfs_streq(buf, "on"))
119 connector->force = DRM_FORCE_ON;
120 else if (sysfs_streq(buf, "on-digital"))
121 connector->force = DRM_FORCE_ON_DIGITAL;
122 else if (sysfs_streq(buf, "off"))
123 connector->force = DRM_FORCE_OFF;
124 else
125 ret = -EINVAL;
126
127 if (old_force != connector->force || !connector->force) {
128 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
129 connector->base.id,
130 connector->name,
131 old_force, connector->force);
132
133 connector->funcs->fill_modes(connector,
134 dev->mode_config.max_width,
135 dev->mode_config.max_height);
136 }
137
138 mutex_unlock(&dev->mode_config.mutex);
139
140 return ret ? ret : count;
141}
142
143static ssize_t status_show(struct device *device,
144 struct device_attribute *attr,
145 char *buf)
146{
147 struct drm_connector *connector = to_drm_connector(device);
148 enum drm_connector_status status;
149
150 status = READ_ONCE(connector->status);
151
152 return snprintf(buf, PAGE_SIZE, "%s\n",
153 drm_get_connector_status_name(status));
154}
155
156static ssize_t dpms_show(struct device *device,
157 struct device_attribute *attr,
158 char *buf)
159{
160 struct drm_connector *connector = to_drm_connector(device);
161 int dpms;
162
163 dpms = READ_ONCE(connector->dpms);
164
165 return snprintf(buf, PAGE_SIZE, "%s\n",
166 drm_get_dpms_name(dpms));
167}
168
169static ssize_t enabled_show(struct device *device,
170 struct device_attribute *attr,
171 char *buf)
172{
173 struct drm_connector *connector = to_drm_connector(device);
174 bool enabled;
175
176 enabled = READ_ONCE(connector->encoder);
177
178 return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n");
179}
180
181static ssize_t edid_show(struct file *filp, struct kobject *kobj,
182 struct bin_attribute *attr, char *buf, loff_t off,
183 size_t count)
184{
185 struct device *connector_dev = kobj_to_dev(kobj);
186 struct drm_connector *connector = to_drm_connector(connector_dev);
187 unsigned char *edid;
188 size_t size;
189 ssize_t ret = 0;
190
191 mutex_lock(&connector->dev->mode_config.mutex);
192 if (!connector->edid_blob_ptr)
193 goto unlock;
194
195 edid = connector->edid_blob_ptr->data;
196 size = connector->edid_blob_ptr->length;
197 if (!edid)
198 goto unlock;
199
200 if (off >= size)
201 goto unlock;
202
203 if (off + count > size)
204 count = size - off;
205 memcpy(buf, edid + off, count);
206
207 ret = count;
208unlock:
209 mutex_unlock(&connector->dev->mode_config.mutex);
210
211 return ret;
212}
213
214static ssize_t modes_show(struct device *device,
215 struct device_attribute *attr,
216 char *buf)
217{
218 struct drm_connector *connector = to_drm_connector(device);
219 struct drm_display_mode *mode;
220 int written = 0;
221
222 mutex_lock(&connector->dev->mode_config.mutex);
223 list_for_each_entry(mode, &connector->modes, head) {
224 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
225 mode->name);
226 }
227 mutex_unlock(&connector->dev->mode_config.mutex);
228
229 return written;
230}
231
232static DEVICE_ATTR_RW(status);
233static DEVICE_ATTR_RO(enabled);
234static DEVICE_ATTR_RO(dpms);
235static DEVICE_ATTR_RO(modes);
236
237static struct attribute *connector_dev_attrs[] = {
238 &dev_attr_status.attr,
239 &dev_attr_enabled.attr,
240 &dev_attr_dpms.attr,
241 &dev_attr_modes.attr,
242 NULL
243};
244
245static struct bin_attribute edid_attr = {
246 .attr.name = "edid",
247 .attr.mode = 0444,
248 .size = 0,
249 .read = edid_show,
250};
251
252static struct bin_attribute *connector_bin_attrs[] = {
253 &edid_attr,
254 NULL
255};
256
257static const struct attribute_group connector_dev_group = {
258 .attrs = connector_dev_attrs,
259 .bin_attrs = connector_bin_attrs,
260};
261
262static const struct attribute_group *connector_dev_groups[] = {
263 &connector_dev_group,
264 NULL
265};
266
267int drm_sysfs_connector_add(struct drm_connector *connector)
268{
269 struct drm_device *dev = connector->dev;
270
271 if (connector->kdev)
272 return 0;
273
274 connector->kdev =
275 device_create_with_groups(drm_class, dev->primary->kdev, 0,
276 connector, connector_dev_groups,
277 "card%d-%s", dev->primary->index,
278 connector->name);
279 DRM_DEBUG("adding \"%s\" to sysfs\n",
280 connector->name);
281
282 if (IS_ERR(connector->kdev)) {
283 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
284 return PTR_ERR(connector->kdev);
285 }
286
287 /* Let userspace know we have a new connector */
288 drm_sysfs_hotplug_event(dev);
289
290 return 0;
291}
292
293void drm_sysfs_connector_remove(struct drm_connector *connector)
294{
295 if (!connector->kdev)
296 return;
297 DRM_DEBUG("removing \"%s\" from sysfs\n",
298 connector->name);
299
300 device_unregister(connector->kdev);
301 connector->kdev = NULL;
302}
303
304/**
305 * drm_sysfs_hotplug_event - generate a DRM uevent
306 * @dev: DRM device
307 *
308 * Send a uevent for the DRM device specified by @dev. Currently we only
309 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
310 * deal with other types of events.
311 */
312void drm_sysfs_hotplug_event(struct drm_device *dev)
313{
314 char *event_string = "HOTPLUG=1";
315 char *envp[] = { event_string, NULL };
316
317 DRM_DEBUG("generating hotplug event\n");
318
319 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
320}
321EXPORT_SYMBOL(drm_sysfs_hotplug_event);
322
323static void drm_sysfs_release(struct device *dev)
324{
325 kfree(dev);
326}
327
328struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
329{
330 const char *minor_str;
331 struct device *kdev;
332 int r;
333
334 if (minor->type == DRM_MINOR_CONTROL)
335 minor_str = "controlD%d";
336 else if (minor->type == DRM_MINOR_RENDER)
337 minor_str = "renderD%d";
338 else
339 minor_str = "card%d";
340
341 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
342 if (!kdev)
343 return ERR_PTR(-ENOMEM);
344
345 device_initialize(kdev);
346 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
347 kdev->class = drm_class;
348 kdev->type = &drm_sysfs_device_minor;
349 kdev->parent = minor->dev->dev;
350 kdev->release = drm_sysfs_release;
351 dev_set_drvdata(kdev, minor);
352
353 r = dev_set_name(kdev, minor_str, minor->index);
354 if (r < 0)
355 goto err_free;
356
357 return kdev;
358
359err_free:
360 put_device(kdev);
361 return ERR_PTR(r);
362}
363
364/**
365 * drm_class_device_register - register new device with the DRM sysfs class
366 * @dev: device to register
367 *
368 * Registers a new &struct device within the DRM sysfs class. Essentially only
369 * used by ttm to have a place for its global settings. Drivers should never use
370 * this.
371 */
372int drm_class_device_register(struct device *dev)
373{
374 if (!drm_class || IS_ERR(drm_class))
375 return -ENOENT;
376
377 dev->class = drm_class;
378 return device_register(dev);
379}
380EXPORT_SYMBOL_GPL(drm_class_device_register);
381
382/**
383 * drm_class_device_unregister - unregister device with the DRM sysfs class
384 * @dev: device to unregister
385 *
386 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
387 * by ttm to have a place for its global settings. Drivers should never use
388 * this.
389 */
390void drm_class_device_unregister(struct device *dev)
391{
392 return device_unregister(dev);
393}
394EXPORT_SYMBOL_GPL(drm_class_device_unregister);