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v5.4
  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);
v5.9
  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);