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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/component.h>
15#include <linux/device.h>
16#include <linux/err.h>
17#include <linux/export.h>
18#include <linux/gfp.h>
19#include <linux/i2c.h>
20#include <linux/kdev_t.h>
21#include <linux/property.h>
22#include <linux/slab.h>
23
24#include <drm/drm_accel.h>
25#include <drm/drm_connector.h>
26#include <drm/drm_device.h>
27#include <drm/drm_file.h>
28#include <drm/drm_modes.h>
29#include <drm/drm_print.h>
30#include <drm/drm_property.h>
31#include <drm/drm_sysfs.h>
32
33#include "drm_internal.h"
34#include "drm_crtc_internal.h"
35
36#define to_drm_minor(d) dev_get_drvdata(d)
37#define to_drm_connector(d) dev_get_drvdata(d)
38
39/**
40 * DOC: overview
41 *
42 * DRM provides very little additional support to drivers for sysfs
43 * interactions, beyond just all the standard stuff. Drivers who want to expose
44 * additional sysfs properties and property groups can attach them at either
45 * &drm_device.dev or &drm_connector.kdev.
46 *
47 * Registration is automatically handled when calling drm_dev_register(), or
48 * drm_connector_register() in case of hot-plugged connectors. Unregistration is
49 * also automatically handled by drm_dev_unregister() and
50 * drm_connector_unregister().
51 */
52
53static struct device_type drm_sysfs_device_minor = {
54 .name = "drm_minor"
55};
56
57static struct device_type drm_sysfs_device_connector = {
58 .name = "drm_connector",
59};
60
61struct class *drm_class;
62
63#ifdef CONFIG_ACPI
64static bool drm_connector_acpi_bus_match(struct device *dev)
65{
66 return dev->type == &drm_sysfs_device_connector;
67}
68
69static struct acpi_device *drm_connector_acpi_find_companion(struct device *dev)
70{
71 struct drm_connector *connector = to_drm_connector(dev);
72
73 return to_acpi_device_node(connector->fwnode);
74}
75
76static struct acpi_bus_type drm_connector_acpi_bus = {
77 .name = "drm_connector",
78 .match = drm_connector_acpi_bus_match,
79 .find_companion = drm_connector_acpi_find_companion,
80};
81
82static void drm_sysfs_acpi_register(void)
83{
84 register_acpi_bus_type(&drm_connector_acpi_bus);
85}
86
87static void drm_sysfs_acpi_unregister(void)
88{
89 unregister_acpi_bus_type(&drm_connector_acpi_bus);
90}
91#else
92static void drm_sysfs_acpi_register(void) { }
93static void drm_sysfs_acpi_unregister(void) { }
94#endif
95
96static char *drm_devnode(const struct device *dev, umode_t *mode)
97{
98 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
99}
100
101static int typec_connector_bind(struct device *dev,
102 struct device *typec_connector, void *data)
103{
104 int ret;
105
106 ret = sysfs_create_link(&dev->kobj, &typec_connector->kobj, "typec_connector");
107 if (ret)
108 return ret;
109
110 ret = sysfs_create_link(&typec_connector->kobj, &dev->kobj, "drm_connector");
111 if (ret)
112 sysfs_remove_link(&dev->kobj, "typec_connector");
113
114 return ret;
115}
116
117static void typec_connector_unbind(struct device *dev,
118 struct device *typec_connector, void *data)
119{
120 sysfs_remove_link(&typec_connector->kobj, "drm_connector");
121 sysfs_remove_link(&dev->kobj, "typec_connector");
122}
123
124static const struct component_ops typec_connector_ops = {
125 .bind = typec_connector_bind,
126 .unbind = typec_connector_unbind,
127};
128
129static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
130
131/**
132 * drm_sysfs_init - initialize sysfs helpers
133 *
134 * This is used to create the DRM class, which is the implicit parent of any
135 * other top-level DRM sysfs objects.
136 *
137 * You must call drm_sysfs_destroy() to release the allocated resources.
138 *
139 * Return: 0 on success, negative error code on failure.
140 */
141int drm_sysfs_init(void)
142{
143 int err;
144
145 drm_class = class_create("drm");
146 if (IS_ERR(drm_class))
147 return PTR_ERR(drm_class);
148
149 err = class_create_file(drm_class, &class_attr_version.attr);
150 if (err) {
151 class_destroy(drm_class);
152 drm_class = NULL;
153 return err;
154 }
155
156 drm_class->devnode = drm_devnode;
157
158 drm_sysfs_acpi_register();
159 return 0;
160}
161
162/**
163 * drm_sysfs_destroy - destroys DRM class
164 *
165 * Destroy the DRM device class.
166 */
167void drm_sysfs_destroy(void)
168{
169 if (IS_ERR_OR_NULL(drm_class))
170 return;
171 drm_sysfs_acpi_unregister();
172 class_remove_file(drm_class, &class_attr_version.attr);
173 class_destroy(drm_class);
174 drm_class = NULL;
175}
176
177static void drm_sysfs_release(struct device *dev)
178{
179 kfree(dev);
180}
181
182/*
183 * Connector properties
184 */
185static ssize_t status_store(struct device *device,
186 struct device_attribute *attr,
187 const char *buf, size_t count)
188{
189 struct drm_connector *connector = to_drm_connector(device);
190 struct drm_device *dev = connector->dev;
191 enum drm_connector_force old_force;
192 int ret;
193
194 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
195 if (ret)
196 return ret;
197
198 old_force = connector->force;
199
200 if (sysfs_streq(buf, "detect"))
201 connector->force = 0;
202 else if (sysfs_streq(buf, "on"))
203 connector->force = DRM_FORCE_ON;
204 else if (sysfs_streq(buf, "on-digital"))
205 connector->force = DRM_FORCE_ON_DIGITAL;
206 else if (sysfs_streq(buf, "off"))
207 connector->force = DRM_FORCE_OFF;
208 else
209 ret = -EINVAL;
210
211 if (old_force != connector->force || !connector->force) {
212 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
213 connector->base.id,
214 connector->name,
215 old_force, connector->force);
216
217 connector->funcs->fill_modes(connector,
218 dev->mode_config.max_width,
219 dev->mode_config.max_height);
220 }
221
222 mutex_unlock(&dev->mode_config.mutex);
223
224 return ret ? ret : count;
225}
226
227static ssize_t status_show(struct device *device,
228 struct device_attribute *attr,
229 char *buf)
230{
231 struct drm_connector *connector = to_drm_connector(device);
232 enum drm_connector_status status;
233
234 status = READ_ONCE(connector->status);
235
236 return sysfs_emit(buf, "%s\n",
237 drm_get_connector_status_name(status));
238}
239
240static ssize_t dpms_show(struct device *device,
241 struct device_attribute *attr,
242 char *buf)
243{
244 struct drm_connector *connector = to_drm_connector(device);
245 int dpms;
246
247 dpms = READ_ONCE(connector->dpms);
248
249 return sysfs_emit(buf, "%s\n", drm_get_dpms_name(dpms));
250}
251
252static ssize_t enabled_show(struct device *device,
253 struct device_attribute *attr,
254 char *buf)
255{
256 struct drm_connector *connector = to_drm_connector(device);
257 bool enabled;
258
259 enabled = READ_ONCE(connector->encoder);
260
261 return sysfs_emit(buf, enabled ? "enabled\n" : "disabled\n");
262}
263
264static ssize_t edid_show(struct file *filp, struct kobject *kobj,
265 struct bin_attribute *attr, char *buf, loff_t off,
266 size_t count)
267{
268 struct device *connector_dev = kobj_to_dev(kobj);
269 struct drm_connector *connector = to_drm_connector(connector_dev);
270 unsigned char *edid;
271 size_t size;
272 ssize_t ret = 0;
273
274 mutex_lock(&connector->dev->mode_config.mutex);
275 if (!connector->edid_blob_ptr)
276 goto unlock;
277
278 edid = connector->edid_blob_ptr->data;
279 size = connector->edid_blob_ptr->length;
280 if (!edid)
281 goto unlock;
282
283 if (off >= size)
284 goto unlock;
285
286 if (off + count > size)
287 count = size - off;
288 memcpy(buf, edid + off, count);
289
290 ret = count;
291unlock:
292 mutex_unlock(&connector->dev->mode_config.mutex);
293
294 return ret;
295}
296
297static ssize_t modes_show(struct device *device,
298 struct device_attribute *attr,
299 char *buf)
300{
301 struct drm_connector *connector = to_drm_connector(device);
302 struct drm_display_mode *mode;
303 int written = 0;
304
305 mutex_lock(&connector->dev->mode_config.mutex);
306 list_for_each_entry(mode, &connector->modes, head) {
307 written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
308 mode->name);
309 }
310 mutex_unlock(&connector->dev->mode_config.mutex);
311
312 return written;
313}
314
315static ssize_t connector_id_show(struct device *device,
316 struct device_attribute *attr,
317 char *buf)
318{
319 struct drm_connector *connector = to_drm_connector(device);
320
321 return sysfs_emit(buf, "%d\n", connector->base.id);
322}
323
324static DEVICE_ATTR_RW(status);
325static DEVICE_ATTR_RO(enabled);
326static DEVICE_ATTR_RO(dpms);
327static DEVICE_ATTR_RO(modes);
328static DEVICE_ATTR_RO(connector_id);
329
330static struct attribute *connector_dev_attrs[] = {
331 &dev_attr_status.attr,
332 &dev_attr_enabled.attr,
333 &dev_attr_dpms.attr,
334 &dev_attr_modes.attr,
335 &dev_attr_connector_id.attr,
336 NULL
337};
338
339static struct bin_attribute edid_attr = {
340 .attr.name = "edid",
341 .attr.mode = 0444,
342 .size = 0,
343 .read = edid_show,
344};
345
346static struct bin_attribute *connector_bin_attrs[] = {
347 &edid_attr,
348 NULL
349};
350
351static const struct attribute_group connector_dev_group = {
352 .attrs = connector_dev_attrs,
353 .bin_attrs = connector_bin_attrs,
354};
355
356static const struct attribute_group *connector_dev_groups[] = {
357 &connector_dev_group,
358 NULL
359};
360
361int drm_sysfs_connector_add(struct drm_connector *connector)
362{
363 struct drm_device *dev = connector->dev;
364 struct device *kdev;
365 int r;
366
367 if (connector->kdev)
368 return 0;
369
370 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
371 if (!kdev)
372 return -ENOMEM;
373
374 device_initialize(kdev);
375 kdev->class = drm_class;
376 kdev->type = &drm_sysfs_device_connector;
377 kdev->parent = dev->primary->kdev;
378 kdev->groups = connector_dev_groups;
379 kdev->release = drm_sysfs_release;
380 dev_set_drvdata(kdev, connector);
381
382 r = dev_set_name(kdev, "card%d-%s", dev->primary->index, connector->name);
383 if (r)
384 goto err_free;
385
386 DRM_DEBUG("adding \"%s\" to sysfs\n",
387 connector->name);
388
389 r = device_add(kdev);
390 if (r) {
391 drm_err(dev, "failed to register connector device: %d\n", r);
392 goto err_free;
393 }
394
395 connector->kdev = kdev;
396
397 if (dev_fwnode(kdev)) {
398 r = component_add(kdev, &typec_connector_ops);
399 if (r)
400 drm_err(dev, "failed to add component to create link to typec connector\n");
401 }
402
403 return 0;
404
405err_free:
406 put_device(kdev);
407 return r;
408}
409
410int drm_sysfs_connector_add_late(struct drm_connector *connector)
411{
412 if (connector->ddc)
413 return sysfs_create_link(&connector->kdev->kobj,
414 &connector->ddc->dev.kobj, "ddc");
415
416 return 0;
417}
418
419void drm_sysfs_connector_remove_early(struct drm_connector *connector)
420{
421 if (connector->ddc)
422 sysfs_remove_link(&connector->kdev->kobj, "ddc");
423}
424
425void drm_sysfs_connector_remove(struct drm_connector *connector)
426{
427 if (!connector->kdev)
428 return;
429
430 if (dev_fwnode(connector->kdev))
431 component_del(connector->kdev, &typec_connector_ops);
432
433 DRM_DEBUG("removing \"%s\" from sysfs\n",
434 connector->name);
435
436 device_unregister(connector->kdev);
437 connector->kdev = NULL;
438}
439
440void drm_sysfs_lease_event(struct drm_device *dev)
441{
442 char *event_string = "LEASE=1";
443 char *envp[] = { event_string, NULL };
444
445 DRM_DEBUG("generating lease event\n");
446
447 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
448}
449
450/**
451 * drm_sysfs_hotplug_event - generate a DRM uevent
452 * @dev: DRM device
453 *
454 * Send a uevent for the DRM device specified by @dev. Currently we only
455 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
456 * deal with other types of events.
457 *
458 * Any new uapi should be using the drm_sysfs_connector_status_event()
459 * for uevents on connector status change.
460 */
461void drm_sysfs_hotplug_event(struct drm_device *dev)
462{
463 char *event_string = "HOTPLUG=1";
464 char *envp[] = { event_string, NULL };
465
466 DRM_DEBUG("generating hotplug event\n");
467
468 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
469}
470EXPORT_SYMBOL(drm_sysfs_hotplug_event);
471
472/**
473 * drm_sysfs_connector_hotplug_event - generate a DRM uevent for any connector
474 * change
475 * @connector: connector which has changed
476 *
477 * Send a uevent for the DRM connector specified by @connector. This will send
478 * a uevent with the properties HOTPLUG=1 and CONNECTOR.
479 */
480void drm_sysfs_connector_hotplug_event(struct drm_connector *connector)
481{
482 struct drm_device *dev = connector->dev;
483 char hotplug_str[] = "HOTPLUG=1", conn_id[21];
484 char *envp[] = { hotplug_str, conn_id, NULL };
485
486 snprintf(conn_id, sizeof(conn_id),
487 "CONNECTOR=%u", connector->base.id);
488
489 drm_dbg_kms(connector->dev,
490 "[CONNECTOR:%d:%s] generating connector hotplug event\n",
491 connector->base.id, connector->name);
492
493 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
494}
495EXPORT_SYMBOL(drm_sysfs_connector_hotplug_event);
496
497/**
498 * drm_sysfs_connector_property_event - generate a DRM uevent for connector
499 * property change
500 * @connector: connector on which property changed
501 * @property: connector property which has changed.
502 *
503 * Send a uevent for the specified DRM connector and property. Currently we
504 * set HOTPLUG=1 and connector id along with the attached property id
505 * related to the change.
506 */
507void drm_sysfs_connector_property_event(struct drm_connector *connector,
508 struct drm_property *property)
509{
510 struct drm_device *dev = connector->dev;
511 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
512 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
513
514 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
515 property->base.id));
516
517 snprintf(conn_id, ARRAY_SIZE(conn_id),
518 "CONNECTOR=%u", connector->base.id);
519 snprintf(prop_id, ARRAY_SIZE(prop_id),
520 "PROPERTY=%u", property->base.id);
521
522 drm_dbg_kms(connector->dev,
523 "[CONNECTOR:%d:%s] generating connector property event for [PROP:%d:%s]\n",
524 connector->base.id, connector->name,
525 property->base.id, property->name);
526
527 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
528}
529EXPORT_SYMBOL(drm_sysfs_connector_property_event);
530
531struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
532{
533 const char *minor_str;
534 struct device *kdev;
535 int r;
536
537 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
538 if (!kdev)
539 return ERR_PTR(-ENOMEM);
540
541 device_initialize(kdev);
542
543 if (minor->type == DRM_MINOR_ACCEL) {
544 minor_str = "accel%d";
545 accel_set_device_instance_params(kdev, minor->index);
546 } else {
547 if (minor->type == DRM_MINOR_RENDER)
548 minor_str = "renderD%d";
549 else
550 minor_str = "card%d";
551
552 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
553 kdev->class = drm_class;
554 kdev->type = &drm_sysfs_device_minor;
555 }
556
557 kdev->parent = minor->dev->dev;
558 kdev->release = drm_sysfs_release;
559 dev_set_drvdata(kdev, minor);
560
561 r = dev_set_name(kdev, minor_str, minor->index);
562 if (r < 0)
563 goto err_free;
564
565 return kdev;
566
567err_free:
568 put_device(kdev);
569 return ERR_PTR(r);
570}
571
572/**
573 * drm_class_device_register - register new device with the DRM sysfs class
574 * @dev: device to register
575 *
576 * Registers a new &struct device within the DRM sysfs class. Essentially only
577 * used by ttm to have a place for its global settings. Drivers should never use
578 * this.
579 */
580int drm_class_device_register(struct device *dev)
581{
582 if (!drm_class || IS_ERR(drm_class))
583 return -ENOENT;
584
585 dev->class = drm_class;
586 return device_register(dev);
587}
588EXPORT_SYMBOL_GPL(drm_class_device_register);
589
590/**
591 * drm_class_device_unregister - unregister device with the DRM sysfs class
592 * @dev: device to unregister
593 *
594 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
595 * by ttm to have a place for its global settings. Drivers should never use
596 * this.
597 */
598void drm_class_device_unregister(struct device *dev)
599{
600 return device_unregister(dev);
601}
602EXPORT_SYMBOL_GPL(drm_class_device_unregister);