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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);
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 return 0;
89}
90
91/**
92 * drm_sysfs_destroy - destroys DRM class
93 *
94 * Destroy the DRM device class.
95 */
96void drm_sysfs_destroy(void)
97{
98 if (IS_ERR_OR_NULL(drm_class))
99 return;
100 class_remove_file(drm_class, &class_attr_version.attr);
101 class_destroy(drm_class);
102 drm_class = NULL;
103}
104
105/*
106 * Connector properties
107 */
108static ssize_t status_store(struct device *device,
109 struct device_attribute *attr,
110 const char *buf, size_t count)
111{
112 struct drm_connector *connector = to_drm_connector(device);
113 struct drm_device *dev = connector->dev;
114 enum drm_connector_force old_force;
115 int ret;
116
117 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
118 if (ret)
119 return ret;
120
121 old_force = connector->force;
122
123 if (sysfs_streq(buf, "detect"))
124 connector->force = 0;
125 else if (sysfs_streq(buf, "on"))
126 connector->force = DRM_FORCE_ON;
127 else if (sysfs_streq(buf, "on-digital"))
128 connector->force = DRM_FORCE_ON_DIGITAL;
129 else if (sysfs_streq(buf, "off"))
130 connector->force = DRM_FORCE_OFF;
131 else
132 ret = -EINVAL;
133
134 if (old_force != connector->force || !connector->force) {
135 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
136 connector->base.id,
137 connector->name,
138 old_force, connector->force);
139
140 connector->funcs->fill_modes(connector,
141 dev->mode_config.max_width,
142 dev->mode_config.max_height);
143 }
144
145 mutex_unlock(&dev->mode_config.mutex);
146
147 return ret ? ret : count;
148}
149
150static ssize_t status_show(struct device *device,
151 struct device_attribute *attr,
152 char *buf)
153{
154 struct drm_connector *connector = to_drm_connector(device);
155 enum drm_connector_status status;
156
157 status = READ_ONCE(connector->status);
158
159 return snprintf(buf, PAGE_SIZE, "%s\n",
160 drm_get_connector_status_name(status));
161}
162
163static ssize_t dpms_show(struct device *device,
164 struct device_attribute *attr,
165 char *buf)
166{
167 struct drm_connector *connector = to_drm_connector(device);
168 int dpms;
169
170 dpms = READ_ONCE(connector->dpms);
171
172 return snprintf(buf, PAGE_SIZE, "%s\n",
173 drm_get_dpms_name(dpms));
174}
175
176static ssize_t enabled_show(struct device *device,
177 struct device_attribute *attr,
178 char *buf)
179{
180 struct drm_connector *connector = to_drm_connector(device);
181 bool enabled;
182
183 enabled = READ_ONCE(connector->encoder);
184
185 return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n");
186}
187
188static ssize_t edid_show(struct file *filp, struct kobject *kobj,
189 struct bin_attribute *attr, char *buf, loff_t off,
190 size_t count)
191{
192 struct device *connector_dev = kobj_to_dev(kobj);
193 struct drm_connector *connector = to_drm_connector(connector_dev);
194 unsigned char *edid;
195 size_t size;
196 ssize_t ret = 0;
197
198 mutex_lock(&connector->dev->mode_config.mutex);
199 if (!connector->edid_blob_ptr)
200 goto unlock;
201
202 edid = connector->edid_blob_ptr->data;
203 size = connector->edid_blob_ptr->length;
204 if (!edid)
205 goto unlock;
206
207 if (off >= size)
208 goto unlock;
209
210 if (off + count > size)
211 count = size - off;
212 memcpy(buf, edid + off, count);
213
214 ret = count;
215unlock:
216 mutex_unlock(&connector->dev->mode_config.mutex);
217
218 return ret;
219}
220
221static ssize_t modes_show(struct device *device,
222 struct device_attribute *attr,
223 char *buf)
224{
225 struct drm_connector *connector = to_drm_connector(device);
226 struct drm_display_mode *mode;
227 int written = 0;
228
229 mutex_lock(&connector->dev->mode_config.mutex);
230 list_for_each_entry(mode, &connector->modes, head) {
231 written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
232 mode->name);
233 }
234 mutex_unlock(&connector->dev->mode_config.mutex);
235
236 return written;
237}
238
239static DEVICE_ATTR_RW(status);
240static DEVICE_ATTR_RO(enabled);
241static DEVICE_ATTR_RO(dpms);
242static DEVICE_ATTR_RO(modes);
243
244static struct attribute *connector_dev_attrs[] = {
245 &dev_attr_status.attr,
246 &dev_attr_enabled.attr,
247 &dev_attr_dpms.attr,
248 &dev_attr_modes.attr,
249 NULL
250};
251
252static struct bin_attribute edid_attr = {
253 .attr.name = "edid",
254 .attr.mode = 0444,
255 .size = 0,
256 .read = edid_show,
257};
258
259static struct bin_attribute *connector_bin_attrs[] = {
260 &edid_attr,
261 NULL
262};
263
264static const struct attribute_group connector_dev_group = {
265 .attrs = connector_dev_attrs,
266 .bin_attrs = connector_bin_attrs,
267};
268
269static const struct attribute_group *connector_dev_groups[] = {
270 &connector_dev_group,
271 NULL
272};
273
274int drm_sysfs_connector_add(struct drm_connector *connector)
275{
276 struct drm_device *dev = connector->dev;
277
278 if (connector->kdev)
279 return 0;
280
281 connector->kdev =
282 device_create_with_groups(drm_class, dev->primary->kdev, 0,
283 connector, connector_dev_groups,
284 "card%d-%s", dev->primary->index,
285 connector->name);
286 DRM_DEBUG("adding \"%s\" to sysfs\n",
287 connector->name);
288
289 if (IS_ERR(connector->kdev)) {
290 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
291 return PTR_ERR(connector->kdev);
292 }
293
294 if (connector->ddc)
295 return sysfs_create_link(&connector->kdev->kobj,
296 &connector->ddc->dev.kobj, "ddc");
297 return 0;
298}
299
300void drm_sysfs_connector_remove(struct drm_connector *connector)
301{
302 if (!connector->kdev)
303 return;
304
305 if (connector->ddc)
306 sysfs_remove_link(&connector->kdev->kobj, "ddc");
307
308 DRM_DEBUG("removing \"%s\" from sysfs\n",
309 connector->name);
310
311 device_unregister(connector->kdev);
312 connector->kdev = NULL;
313}
314
315void drm_sysfs_lease_event(struct drm_device *dev)
316{
317 char *event_string = "LEASE=1";
318 char *envp[] = { event_string, NULL };
319
320 DRM_DEBUG("generating lease event\n");
321
322 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
323}
324
325/**
326 * drm_sysfs_hotplug_event - generate a DRM uevent
327 * @dev: DRM device
328 *
329 * Send a uevent for the DRM device specified by @dev. Currently we only
330 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
331 * deal with other types of events.
332 *
333 * Any new uapi should be using the drm_sysfs_connector_status_event()
334 * for uevents on connector status change.
335 */
336void drm_sysfs_hotplug_event(struct drm_device *dev)
337{
338 char *event_string = "HOTPLUG=1";
339 char *envp[] = { event_string, NULL };
340
341 DRM_DEBUG("generating hotplug event\n");
342
343 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
344}
345EXPORT_SYMBOL(drm_sysfs_hotplug_event);
346
347/**
348 * drm_sysfs_connector_status_event - generate a DRM uevent for connector
349 * property status change
350 * @connector: connector on which property status changed
351 * @property: connector property whose status changed.
352 *
353 * Send a uevent for the DRM device specified by @dev. Currently we
354 * set HOTPLUG=1 and connector id along with the attached property id
355 * related to the status change.
356 */
357void drm_sysfs_connector_status_event(struct drm_connector *connector,
358 struct drm_property *property)
359{
360 struct drm_device *dev = connector->dev;
361 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
362 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
363
364 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
365 property->base.id));
366
367 snprintf(conn_id, ARRAY_SIZE(conn_id),
368 "CONNECTOR=%u", connector->base.id);
369 snprintf(prop_id, ARRAY_SIZE(prop_id),
370 "PROPERTY=%u", property->base.id);
371
372 DRM_DEBUG("generating connector status event\n");
373
374 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
375}
376EXPORT_SYMBOL(drm_sysfs_connector_status_event);
377
378static void drm_sysfs_release(struct device *dev)
379{
380 kfree(dev);
381}
382
383struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
384{
385 const char *minor_str;
386 struct device *kdev;
387 int r;
388
389 if (minor->type == DRM_MINOR_RENDER)
390 minor_str = "renderD%d";
391 else
392 minor_str = "card%d";
393
394 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
395 if (!kdev)
396 return ERR_PTR(-ENOMEM);
397
398 device_initialize(kdev);
399 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
400 kdev->class = drm_class;
401 kdev->type = &drm_sysfs_device_minor;
402 kdev->parent = minor->dev->dev;
403 kdev->release = drm_sysfs_release;
404 dev_set_drvdata(kdev, minor);
405
406 r = dev_set_name(kdev, minor_str, minor->index);
407 if (r < 0)
408 goto err_free;
409
410 return kdev;
411
412err_free:
413 put_device(kdev);
414 return ERR_PTR(r);
415}
416
417/**
418 * drm_class_device_register - register new device with the DRM sysfs class
419 * @dev: device to register
420 *
421 * Registers a new &struct device within the DRM sysfs class. Essentially only
422 * used by ttm to have a place for its global settings. Drivers should never use
423 * this.
424 */
425int drm_class_device_register(struct device *dev)
426{
427 if (!drm_class || IS_ERR(drm_class))
428 return -ENOENT;
429
430 dev->class = drm_class;
431 return device_register(dev);
432}
433EXPORT_SYMBOL_GPL(drm_class_device_register);
434
435/**
436 * drm_class_device_unregister - unregister device with the DRM sysfs class
437 * @dev: device to unregister
438 *
439 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
440 * by ttm to have a place for its global settings. Drivers should never use
441 * this.
442 */
443void drm_class_device_unregister(struct device *dev)
444{
445 return device_unregister(dev);
446}
447EXPORT_SYMBOL_GPL(drm_class_device_unregister);