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