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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/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);