Loading...
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// 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);