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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 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);
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/acpi.h>
14#include <linux/device.h>
15#include <linux/err.h>
16#include <linux/export.h>
17#include <linux/gfp.h>
18#include <linux/i2c.h>
19#include <linux/kdev_t.h>
20#include <linux/slab.h>
21
22#include <drm/drm_accel.h>
23#include <drm/drm_connector.h>
24#include <drm/drm_device.h>
25#include <drm/drm_file.h>
26#include <drm/drm_modes.h>
27#include <drm/drm_print.h>
28#include <drm/drm_property.h>
29#include <drm/drm_sysfs.h>
30
31#include "drm_internal.h"
32#include "drm_crtc_internal.h"
33
34#define to_drm_minor(d) dev_get_drvdata(d)
35#define to_drm_connector(d) dev_get_drvdata(d)
36
37/**
38 * DOC: overview
39 *
40 * DRM provides very little additional support to drivers for sysfs
41 * interactions, beyond just all the standard stuff. Drivers who want to expose
42 * additional sysfs properties and property groups can attach them at either
43 * &drm_device.dev or &drm_connector.kdev.
44 *
45 * Registration is automatically handled when calling drm_dev_register(), or
46 * drm_connector_register() in case of hot-plugged connectors. Unregistration is
47 * also automatically handled by drm_dev_unregister() and
48 * drm_connector_unregister().
49 */
50
51static struct device_type drm_sysfs_device_minor = {
52 .name = "drm_minor"
53};
54
55static struct device_type drm_sysfs_device_connector = {
56 .name = "drm_connector",
57};
58
59struct class *drm_class;
60
61#ifdef CONFIG_ACPI
62static bool drm_connector_acpi_bus_match(struct device *dev)
63{
64 return dev->type == &drm_sysfs_device_connector;
65}
66
67static struct acpi_device *drm_connector_acpi_find_companion(struct device *dev)
68{
69 struct drm_connector *connector = to_drm_connector(dev);
70
71 return to_acpi_device_node(connector->fwnode);
72}
73
74static struct acpi_bus_type drm_connector_acpi_bus = {
75 .name = "drm_connector",
76 .match = drm_connector_acpi_bus_match,
77 .find_companion = drm_connector_acpi_find_companion,
78};
79
80static void drm_sysfs_acpi_register(void)
81{
82 register_acpi_bus_type(&drm_connector_acpi_bus);
83}
84
85static void drm_sysfs_acpi_unregister(void)
86{
87 unregister_acpi_bus_type(&drm_connector_acpi_bus);
88}
89#else
90static void drm_sysfs_acpi_register(void) { }
91static void drm_sysfs_acpi_unregister(void) { }
92#endif
93
94static char *drm_devnode(const struct device *dev, umode_t *mode)
95{
96 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
97}
98
99static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
100
101/**
102 * drm_sysfs_init - initialize sysfs helpers
103 *
104 * This is used to create the DRM class, which is the implicit parent of any
105 * other top-level DRM sysfs objects.
106 *
107 * You must call drm_sysfs_destroy() to release the allocated resources.
108 *
109 * Return: 0 on success, negative error code on failure.
110 */
111int drm_sysfs_init(void)
112{
113 int err;
114
115 drm_class = class_create(THIS_MODULE, "drm");
116 if (IS_ERR(drm_class))
117 return PTR_ERR(drm_class);
118
119 err = class_create_file(drm_class, &class_attr_version.attr);
120 if (err) {
121 class_destroy(drm_class);
122 drm_class = NULL;
123 return err;
124 }
125
126 drm_class->devnode = drm_devnode;
127
128 drm_sysfs_acpi_register();
129 return 0;
130}
131
132/**
133 * drm_sysfs_destroy - destroys DRM class
134 *
135 * Destroy the DRM device class.
136 */
137void drm_sysfs_destroy(void)
138{
139 if (IS_ERR_OR_NULL(drm_class))
140 return;
141 drm_sysfs_acpi_unregister();
142 class_remove_file(drm_class, &class_attr_version.attr);
143 class_destroy(drm_class);
144 drm_class = NULL;
145}
146
147static void drm_sysfs_release(struct device *dev)
148{
149 kfree(dev);
150}
151
152/*
153 * Connector properties
154 */
155static ssize_t status_store(struct device *device,
156 struct device_attribute *attr,
157 const char *buf, size_t count)
158{
159 struct drm_connector *connector = to_drm_connector(device);
160 struct drm_device *dev = connector->dev;
161 enum drm_connector_force old_force;
162 int ret;
163
164 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
165 if (ret)
166 return ret;
167
168 old_force = connector->force;
169
170 if (sysfs_streq(buf, "detect"))
171 connector->force = 0;
172 else if (sysfs_streq(buf, "on"))
173 connector->force = DRM_FORCE_ON;
174 else if (sysfs_streq(buf, "on-digital"))
175 connector->force = DRM_FORCE_ON_DIGITAL;
176 else if (sysfs_streq(buf, "off"))
177 connector->force = DRM_FORCE_OFF;
178 else
179 ret = -EINVAL;
180
181 if (old_force != connector->force || !connector->force) {
182 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
183 connector->base.id,
184 connector->name,
185 old_force, connector->force);
186
187 connector->funcs->fill_modes(connector,
188 dev->mode_config.max_width,
189 dev->mode_config.max_height);
190 }
191
192 mutex_unlock(&dev->mode_config.mutex);
193
194 return ret ? ret : count;
195}
196
197static ssize_t status_show(struct device *device,
198 struct device_attribute *attr,
199 char *buf)
200{
201 struct drm_connector *connector = to_drm_connector(device);
202 enum drm_connector_status status;
203
204 status = READ_ONCE(connector->status);
205
206 return sysfs_emit(buf, "%s\n",
207 drm_get_connector_status_name(status));
208}
209
210static ssize_t dpms_show(struct device *device,
211 struct device_attribute *attr,
212 char *buf)
213{
214 struct drm_connector *connector = to_drm_connector(device);
215 int dpms;
216
217 dpms = READ_ONCE(connector->dpms);
218
219 return sysfs_emit(buf, "%s\n", drm_get_dpms_name(dpms));
220}
221
222static ssize_t enabled_show(struct device *device,
223 struct device_attribute *attr,
224 char *buf)
225{
226 struct drm_connector *connector = to_drm_connector(device);
227 bool enabled;
228
229 enabled = READ_ONCE(connector->encoder);
230
231 return sysfs_emit(buf, enabled ? "enabled\n" : "disabled\n");
232}
233
234static ssize_t edid_show(struct file *filp, struct kobject *kobj,
235 struct bin_attribute *attr, char *buf, loff_t off,
236 size_t count)
237{
238 struct device *connector_dev = kobj_to_dev(kobj);
239 struct drm_connector *connector = to_drm_connector(connector_dev);
240 unsigned char *edid;
241 size_t size;
242 ssize_t ret = 0;
243
244 mutex_lock(&connector->dev->mode_config.mutex);
245 if (!connector->edid_blob_ptr)
246 goto unlock;
247
248 edid = connector->edid_blob_ptr->data;
249 size = connector->edid_blob_ptr->length;
250 if (!edid)
251 goto unlock;
252
253 if (off >= size)
254 goto unlock;
255
256 if (off + count > size)
257 count = size - off;
258 memcpy(buf, edid + off, count);
259
260 ret = count;
261unlock:
262 mutex_unlock(&connector->dev->mode_config.mutex);
263
264 return ret;
265}
266
267static ssize_t modes_show(struct device *device,
268 struct device_attribute *attr,
269 char *buf)
270{
271 struct drm_connector *connector = to_drm_connector(device);
272 struct drm_display_mode *mode;
273 int written = 0;
274
275 mutex_lock(&connector->dev->mode_config.mutex);
276 list_for_each_entry(mode, &connector->modes, head) {
277 written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
278 mode->name);
279 }
280 mutex_unlock(&connector->dev->mode_config.mutex);
281
282 return written;
283}
284
285static DEVICE_ATTR_RW(status);
286static DEVICE_ATTR_RO(enabled);
287static DEVICE_ATTR_RO(dpms);
288static DEVICE_ATTR_RO(modes);
289
290static struct attribute *connector_dev_attrs[] = {
291 &dev_attr_status.attr,
292 &dev_attr_enabled.attr,
293 &dev_attr_dpms.attr,
294 &dev_attr_modes.attr,
295 NULL
296};
297
298static struct bin_attribute edid_attr = {
299 .attr.name = "edid",
300 .attr.mode = 0444,
301 .size = 0,
302 .read = edid_show,
303};
304
305static struct bin_attribute *connector_bin_attrs[] = {
306 &edid_attr,
307 NULL
308};
309
310static const struct attribute_group connector_dev_group = {
311 .attrs = connector_dev_attrs,
312 .bin_attrs = connector_bin_attrs,
313};
314
315static const struct attribute_group *connector_dev_groups[] = {
316 &connector_dev_group,
317 NULL
318};
319
320int drm_sysfs_connector_add(struct drm_connector *connector)
321{
322 struct drm_device *dev = connector->dev;
323 struct device *kdev;
324 int r;
325
326 if (connector->kdev)
327 return 0;
328
329 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
330 if (!kdev)
331 return -ENOMEM;
332
333 device_initialize(kdev);
334 kdev->class = drm_class;
335 kdev->type = &drm_sysfs_device_connector;
336 kdev->parent = dev->primary->kdev;
337 kdev->groups = connector_dev_groups;
338 kdev->release = drm_sysfs_release;
339 dev_set_drvdata(kdev, connector);
340
341 r = dev_set_name(kdev, "card%d-%s", dev->primary->index, connector->name);
342 if (r)
343 goto err_free;
344
345 DRM_DEBUG("adding \"%s\" to sysfs\n",
346 connector->name);
347
348 r = device_add(kdev);
349 if (r) {
350 drm_err(dev, "failed to register connector device: %d\n", r);
351 goto err_free;
352 }
353
354 connector->kdev = kdev;
355
356 if (connector->ddc)
357 return sysfs_create_link(&connector->kdev->kobj,
358 &connector->ddc->dev.kobj, "ddc");
359 return 0;
360
361err_free:
362 put_device(kdev);
363 return r;
364}
365
366void drm_sysfs_connector_remove(struct drm_connector *connector)
367{
368 if (!connector->kdev)
369 return;
370
371 if (connector->ddc)
372 sysfs_remove_link(&connector->kdev->kobj, "ddc");
373
374 DRM_DEBUG("removing \"%s\" from sysfs\n",
375 connector->name);
376
377 device_unregister(connector->kdev);
378 connector->kdev = NULL;
379}
380
381void drm_sysfs_lease_event(struct drm_device *dev)
382{
383 char *event_string = "LEASE=1";
384 char *envp[] = { event_string, NULL };
385
386 DRM_DEBUG("generating lease event\n");
387
388 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
389}
390
391/**
392 * drm_sysfs_hotplug_event - generate a DRM uevent
393 * @dev: DRM device
394 *
395 * Send a uevent for the DRM device specified by @dev. Currently we only
396 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
397 * deal with other types of events.
398 *
399 * Any new uapi should be using the drm_sysfs_connector_status_event()
400 * for uevents on connector status change.
401 */
402void drm_sysfs_hotplug_event(struct drm_device *dev)
403{
404 char *event_string = "HOTPLUG=1";
405 char *envp[] = { event_string, NULL };
406
407 DRM_DEBUG("generating hotplug event\n");
408
409 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
410}
411EXPORT_SYMBOL(drm_sysfs_hotplug_event);
412
413/**
414 * drm_sysfs_connector_hotplug_event - generate a DRM uevent for any connector
415 * change
416 * @connector: connector which has changed
417 *
418 * Send a uevent for the DRM connector specified by @connector. This will send
419 * a uevent with the properties HOTPLUG=1 and CONNECTOR.
420 */
421void drm_sysfs_connector_hotplug_event(struct drm_connector *connector)
422{
423 struct drm_device *dev = connector->dev;
424 char hotplug_str[] = "HOTPLUG=1", conn_id[21];
425 char *envp[] = { hotplug_str, conn_id, NULL };
426
427 snprintf(conn_id, sizeof(conn_id),
428 "CONNECTOR=%u", connector->base.id);
429
430 drm_dbg_kms(connector->dev,
431 "[CONNECTOR:%d:%s] generating connector hotplug event\n",
432 connector->base.id, connector->name);
433
434 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
435}
436EXPORT_SYMBOL(drm_sysfs_connector_hotplug_event);
437
438/**
439 * drm_sysfs_connector_status_event - generate a DRM uevent for connector
440 * property status change
441 * @connector: connector on which property status changed
442 * @property: connector property whose status changed.
443 *
444 * Send a uevent for the DRM device specified by @dev. Currently we
445 * set HOTPLUG=1 and connector id along with the attached property id
446 * related to the status change.
447 */
448void drm_sysfs_connector_status_event(struct drm_connector *connector,
449 struct drm_property *property)
450{
451 struct drm_device *dev = connector->dev;
452 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
453 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
454
455 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
456 property->base.id));
457
458 snprintf(conn_id, ARRAY_SIZE(conn_id),
459 "CONNECTOR=%u", connector->base.id);
460 snprintf(prop_id, ARRAY_SIZE(prop_id),
461 "PROPERTY=%u", property->base.id);
462
463 DRM_DEBUG("generating connector status event\n");
464
465 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
466}
467EXPORT_SYMBOL(drm_sysfs_connector_status_event);
468
469struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
470{
471 const char *minor_str;
472 struct device *kdev;
473 int r;
474
475 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
476 if (!kdev)
477 return ERR_PTR(-ENOMEM);
478
479 device_initialize(kdev);
480
481 if (minor->type == DRM_MINOR_ACCEL) {
482 minor_str = "accel%d";
483 accel_set_device_instance_params(kdev, minor->index);
484 } else {
485 if (minor->type == DRM_MINOR_RENDER)
486 minor_str = "renderD%d";
487 else
488 minor_str = "card%d";
489
490 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
491 kdev->class = drm_class;
492 kdev->type = &drm_sysfs_device_minor;
493 }
494
495 kdev->parent = minor->dev->dev;
496 kdev->release = drm_sysfs_release;
497 dev_set_drvdata(kdev, minor);
498
499 r = dev_set_name(kdev, minor_str, minor->index);
500 if (r < 0)
501 goto err_free;
502
503 return kdev;
504
505err_free:
506 put_device(kdev);
507 return ERR_PTR(r);
508}
509
510/**
511 * drm_class_device_register - register new device with the DRM sysfs class
512 * @dev: device to register
513 *
514 * Registers a new &struct device within the DRM sysfs class. Essentially only
515 * used by ttm to have a place for its global settings. Drivers should never use
516 * this.
517 */
518int drm_class_device_register(struct device *dev)
519{
520 if (!drm_class || IS_ERR(drm_class))
521 return -ENOENT;
522
523 dev->class = drm_class;
524 return device_register(dev);
525}
526EXPORT_SYMBOL_GPL(drm_class_device_register);
527
528/**
529 * drm_class_device_unregister - unregister device with the DRM sysfs class
530 * @dev: device to unregister
531 *
532 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
533 * by ttm to have a place for its global settings. Drivers should never use
534 * this.
535 */
536void drm_class_device_unregister(struct device *dev)
537{
538 return device_unregister(dev);
539}
540EXPORT_SYMBOL_GPL(drm_class_device_unregister);