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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/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_dbg_kms(dev, "[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
213 connector->base.id, connector->name,
214 old_force, connector->force);
215
216 connector->funcs->fill_modes(connector,
217 dev->mode_config.max_width,
218 dev->mode_config.max_height);
219 }
220
221 mutex_unlock(&dev->mode_config.mutex);
222
223 return ret ? ret : count;
224}
225
226static ssize_t status_show(struct device *device,
227 struct device_attribute *attr,
228 char *buf)
229{
230 struct drm_connector *connector = to_drm_connector(device);
231 enum drm_connector_status status;
232
233 status = READ_ONCE(connector->status);
234
235 return sysfs_emit(buf, "%s\n",
236 drm_get_connector_status_name(status));
237}
238
239static ssize_t dpms_show(struct device *device,
240 struct device_attribute *attr,
241 char *buf)
242{
243 struct drm_connector *connector = to_drm_connector(device);
244 int dpms;
245
246 dpms = READ_ONCE(connector->dpms);
247
248 return sysfs_emit(buf, "%s\n", drm_get_dpms_name(dpms));
249}
250
251static ssize_t enabled_show(struct device *device,
252 struct device_attribute *attr,
253 char *buf)
254{
255 struct drm_connector *connector = to_drm_connector(device);
256 bool enabled;
257
258 enabled = READ_ONCE(connector->encoder);
259
260 return sysfs_emit(buf, enabled ? "enabled\n" : "disabled\n");
261}
262
263static ssize_t edid_show(struct file *filp, struct kobject *kobj,
264 struct bin_attribute *attr, char *buf, loff_t off,
265 size_t count)
266{
267 struct device *connector_dev = kobj_to_dev(kobj);
268 struct drm_connector *connector = to_drm_connector(connector_dev);
269 ssize_t ret;
270
271 ret = drm_edid_connector_property_show(connector, buf, off, count);
272
273 return ret;
274}
275
276static ssize_t modes_show(struct device *device,
277 struct device_attribute *attr,
278 char *buf)
279{
280 struct drm_connector *connector = to_drm_connector(device);
281 struct drm_display_mode *mode;
282 int written = 0;
283
284 mutex_lock(&connector->dev->mode_config.mutex);
285 list_for_each_entry(mode, &connector->modes, head) {
286 written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
287 mode->name);
288 }
289 mutex_unlock(&connector->dev->mode_config.mutex);
290
291 return written;
292}
293
294static ssize_t connector_id_show(struct device *device,
295 struct device_attribute *attr,
296 char *buf)
297{
298 struct drm_connector *connector = to_drm_connector(device);
299
300 return sysfs_emit(buf, "%d\n", connector->base.id);
301}
302
303static DEVICE_ATTR_RW(status);
304static DEVICE_ATTR_RO(enabled);
305static DEVICE_ATTR_RO(dpms);
306static DEVICE_ATTR_RO(modes);
307static DEVICE_ATTR_RO(connector_id);
308
309static struct attribute *connector_dev_attrs[] = {
310 &dev_attr_status.attr,
311 &dev_attr_enabled.attr,
312 &dev_attr_dpms.attr,
313 &dev_attr_modes.attr,
314 &dev_attr_connector_id.attr,
315 NULL
316};
317
318static struct bin_attribute edid_attr = {
319 .attr.name = "edid",
320 .attr.mode = 0444,
321 .size = 0,
322 .read = edid_show,
323};
324
325static struct bin_attribute *connector_bin_attrs[] = {
326 &edid_attr,
327 NULL
328};
329
330static const struct attribute_group connector_dev_group = {
331 .attrs = connector_dev_attrs,
332 .bin_attrs = connector_bin_attrs,
333};
334
335static const struct attribute_group *connector_dev_groups[] = {
336 &connector_dev_group,
337 NULL
338};
339
340int drm_sysfs_connector_add(struct drm_connector *connector)
341{
342 struct drm_device *dev = connector->dev;
343 struct device *kdev;
344 int r;
345
346 if (connector->kdev)
347 return 0;
348
349 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
350 if (!kdev)
351 return -ENOMEM;
352
353 device_initialize(kdev);
354 kdev->class = drm_class;
355 kdev->type = &drm_sysfs_device_connector;
356 kdev->parent = dev->primary->kdev;
357 kdev->groups = connector_dev_groups;
358 kdev->release = drm_sysfs_release;
359 dev_set_drvdata(kdev, connector);
360
361 r = dev_set_name(kdev, "card%d-%s", dev->primary->index, connector->name);
362 if (r)
363 goto err_free;
364
365 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] adding connector to sysfs\n",
366 connector->base.id, connector->name);
367
368 r = device_add(kdev);
369 if (r) {
370 drm_err(dev, "failed to register connector device: %d\n", r);
371 goto err_free;
372 }
373
374 connector->kdev = kdev;
375
376 if (dev_fwnode(kdev)) {
377 r = component_add(kdev, &typec_connector_ops);
378 if (r)
379 drm_err(dev, "failed to add component to create link to typec connector\n");
380 }
381
382 return 0;
383
384err_free:
385 put_device(kdev);
386 return r;
387}
388
389int drm_sysfs_connector_add_late(struct drm_connector *connector)
390{
391 if (connector->ddc)
392 return sysfs_create_link(&connector->kdev->kobj,
393 &connector->ddc->dev.kobj, "ddc");
394
395 return 0;
396}
397
398void drm_sysfs_connector_remove_early(struct drm_connector *connector)
399{
400 if (connector->ddc)
401 sysfs_remove_link(&connector->kdev->kobj, "ddc");
402}
403
404void drm_sysfs_connector_remove(struct drm_connector *connector)
405{
406 if (!connector->kdev)
407 return;
408
409 if (dev_fwnode(connector->kdev))
410 component_del(connector->kdev, &typec_connector_ops);
411
412 drm_dbg_kms(connector->dev,
413 "[CONNECTOR:%d:%s] removing connector from sysfs\n",
414 connector->base.id, connector->name);
415
416 device_unregister(connector->kdev);
417 connector->kdev = NULL;
418}
419
420void drm_sysfs_lease_event(struct drm_device *dev)
421{
422 char *event_string = "LEASE=1";
423 char *envp[] = { event_string, NULL };
424
425 drm_dbg_lease(dev, "generating lease event\n");
426
427 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
428}
429
430/**
431 * drm_sysfs_hotplug_event - generate a DRM uevent
432 * @dev: DRM device
433 *
434 * Send a uevent for the DRM device specified by @dev. Currently we only
435 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
436 * deal with other types of events.
437 *
438 * Any new uapi should be using the drm_sysfs_connector_status_event()
439 * for uevents on connector status change.
440 */
441void drm_sysfs_hotplug_event(struct drm_device *dev)
442{
443 char *event_string = "HOTPLUG=1";
444 char *envp[] = { event_string, NULL };
445
446 drm_dbg_kms(dev, "generating hotplug event\n");
447
448 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
449}
450EXPORT_SYMBOL(drm_sysfs_hotplug_event);
451
452/**
453 * drm_sysfs_connector_hotplug_event - generate a DRM uevent for any connector
454 * change
455 * @connector: connector which has changed
456 *
457 * Send a uevent for the DRM connector specified by @connector. This will send
458 * a uevent with the properties HOTPLUG=1 and CONNECTOR.
459 */
460void drm_sysfs_connector_hotplug_event(struct drm_connector *connector)
461{
462 struct drm_device *dev = connector->dev;
463 char hotplug_str[] = "HOTPLUG=1", conn_id[21];
464 char *envp[] = { hotplug_str, conn_id, NULL };
465
466 snprintf(conn_id, sizeof(conn_id),
467 "CONNECTOR=%u", connector->base.id);
468
469 drm_dbg_kms(connector->dev,
470 "[CONNECTOR:%d:%s] generating connector hotplug event\n",
471 connector->base.id, connector->name);
472
473 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
474}
475EXPORT_SYMBOL(drm_sysfs_connector_hotplug_event);
476
477/**
478 * drm_sysfs_connector_property_event - generate a DRM uevent for connector
479 * property change
480 * @connector: connector on which property changed
481 * @property: connector property which has changed.
482 *
483 * Send a uevent for the specified DRM connector and property. Currently we
484 * set HOTPLUG=1 and connector id along with the attached property id
485 * related to the change.
486 */
487void drm_sysfs_connector_property_event(struct drm_connector *connector,
488 struct drm_property *property)
489{
490 struct drm_device *dev = connector->dev;
491 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
492 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
493
494 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
495 property->base.id));
496
497 snprintf(conn_id, ARRAY_SIZE(conn_id),
498 "CONNECTOR=%u", connector->base.id);
499 snprintf(prop_id, ARRAY_SIZE(prop_id),
500 "PROPERTY=%u", property->base.id);
501
502 drm_dbg_kms(connector->dev,
503 "[CONNECTOR:%d:%s] generating connector property event for [PROP:%d:%s]\n",
504 connector->base.id, connector->name,
505 property->base.id, property->name);
506
507 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
508}
509EXPORT_SYMBOL(drm_sysfs_connector_property_event);
510
511struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
512{
513 const char *minor_str;
514 struct device *kdev;
515 int r;
516
517 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
518 if (!kdev)
519 return ERR_PTR(-ENOMEM);
520
521 device_initialize(kdev);
522
523 if (minor->type == DRM_MINOR_ACCEL) {
524 minor_str = "accel%d";
525 accel_set_device_instance_params(kdev, minor->index);
526 } else {
527 if (minor->type == DRM_MINOR_RENDER)
528 minor_str = "renderD%d";
529 else
530 minor_str = "card%d";
531
532 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
533 kdev->class = drm_class;
534 kdev->type = &drm_sysfs_device_minor;
535 }
536
537 kdev->parent = minor->dev->dev;
538 kdev->release = drm_sysfs_release;
539 dev_set_drvdata(kdev, minor);
540
541 r = dev_set_name(kdev, minor_str, minor->index);
542 if (r < 0)
543 goto err_free;
544
545 return kdev;
546
547err_free:
548 put_device(kdev);
549 return ERR_PTR(r);
550}
551
552/**
553 * drm_class_device_register - register new device with the DRM sysfs class
554 * @dev: device to register
555 *
556 * Registers a new &struct device within the DRM sysfs class. Essentially only
557 * used by ttm to have a place for its global settings. Drivers should never use
558 * this.
559 */
560int drm_class_device_register(struct device *dev)
561{
562 if (!drm_class || IS_ERR(drm_class))
563 return -ENOENT;
564
565 dev->class = drm_class;
566 return device_register(dev);
567}
568EXPORT_SYMBOL_GPL(drm_class_device_register);
569
570/**
571 * drm_class_device_unregister - unregister device with the DRM sysfs class
572 * @dev: device to unregister
573 *
574 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
575 * by ttm to have a place for its global settings. Drivers should never use
576 * this.
577 */
578void drm_class_device_unregister(struct device *dev)
579{
580 return device_unregister(dev);
581}
582EXPORT_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);