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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_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);
1
2/*
3 * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
4 * extra sysfs attribute from DRM. Normal drm_sysfs_class
5 * does not allow adding attributes.
6 *
7 * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
8 * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
9 * Copyright (c) 2003-2004 IBM Corp.
10 *
11 * This file is released under the GPLv2
12 *
13 */
14
15#include <linux/device.h>
16#include <linux/kdev_t.h>
17#include <linux/gfp.h>
18#include <linux/err.h>
19#include <linux/export.h>
20
21#include "drm_sysfs.h"
22#include "drm_core.h"
23#include "drmP.h"
24
25#define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
26#define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
27
28static struct device_type drm_sysfs_device_minor = {
29 .name = "drm_minor"
30};
31
32/**
33 * drm_class_suspend - DRM class suspend hook
34 * @dev: Linux device to suspend
35 * @state: power state to enter
36 *
37 * Just figures out what the actual struct drm_device associated with
38 * @dev is and calls its suspend hook, if present.
39 */
40static int drm_class_suspend(struct device *dev, pm_message_t state)
41{
42 if (dev->type == &drm_sysfs_device_minor) {
43 struct drm_minor *drm_minor = to_drm_minor(dev);
44 struct drm_device *drm_dev = drm_minor->dev;
45
46 if (drm_minor->type == DRM_MINOR_LEGACY &&
47 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
48 drm_dev->driver->suspend)
49 return drm_dev->driver->suspend(drm_dev, state);
50 }
51 return 0;
52}
53
54/**
55 * drm_class_resume - DRM class resume hook
56 * @dev: Linux device to resume
57 *
58 * Just figures out what the actual struct drm_device associated with
59 * @dev is and calls its resume hook, if present.
60 */
61static int drm_class_resume(struct device *dev)
62{
63 if (dev->type == &drm_sysfs_device_minor) {
64 struct drm_minor *drm_minor = to_drm_minor(dev);
65 struct drm_device *drm_dev = drm_minor->dev;
66
67 if (drm_minor->type == DRM_MINOR_LEGACY &&
68 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
69 drm_dev->driver->resume)
70 return drm_dev->driver->resume(drm_dev);
71 }
72 return 0;
73}
74
75static char *drm_devnode(struct device *dev, umode_t *mode)
76{
77 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
78}
79
80static CLASS_ATTR_STRING(version, S_IRUGO,
81 CORE_NAME " "
82 __stringify(CORE_MAJOR) "."
83 __stringify(CORE_MINOR) "."
84 __stringify(CORE_PATCHLEVEL) " "
85 CORE_DATE);
86
87/**
88 * drm_sysfs_create - create a struct drm_sysfs_class structure
89 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
90 * @name: pointer to a string for the name of this class.
91 *
92 * This is used to create DRM class pointer that can then be used
93 * in calls to drm_sysfs_device_add().
94 *
95 * Note, the pointer created here is to be destroyed when finished by making a
96 * call to drm_sysfs_destroy().
97 */
98struct class *drm_sysfs_create(struct module *owner, char *name)
99{
100 struct class *class;
101 int err;
102
103 class = class_create(owner, name);
104 if (IS_ERR(class)) {
105 err = PTR_ERR(class);
106 goto err_out;
107 }
108
109 class->suspend = drm_class_suspend;
110 class->resume = drm_class_resume;
111
112 err = class_create_file(class, &class_attr_version.attr);
113 if (err)
114 goto err_out_class;
115
116 class->devnode = drm_devnode;
117
118 return class;
119
120err_out_class:
121 class_destroy(class);
122err_out:
123 return ERR_PTR(err);
124}
125
126/**
127 * drm_sysfs_destroy - destroys DRM class
128 *
129 * Destroy the DRM device class.
130 */
131void drm_sysfs_destroy(void)
132{
133 if ((drm_class == NULL) || (IS_ERR(drm_class)))
134 return;
135 class_remove_file(drm_class, &class_attr_version.attr);
136 class_destroy(drm_class);
137}
138
139/**
140 * drm_sysfs_device_release - do nothing
141 * @dev: Linux device
142 *
143 * Normally, this would free the DRM device associated with @dev, along
144 * with cleaning up any other stuff. But we do that in the DRM core, so
145 * this function can just return and hope that the core does its job.
146 */
147static void drm_sysfs_device_release(struct device *dev)
148{
149 memset(dev, 0, sizeof(struct device));
150 return;
151}
152
153/*
154 * Connector properties
155 */
156static ssize_t status_show(struct device *device,
157 struct device_attribute *attr,
158 char *buf)
159{
160 struct drm_connector *connector = to_drm_connector(device);
161 enum drm_connector_status status;
162 int ret;
163
164 ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
165 if (ret)
166 return ret;
167
168 status = connector->funcs->detect(connector, true);
169 mutex_unlock(&connector->dev->mode_config.mutex);
170
171 return snprintf(buf, PAGE_SIZE, "%s\n",
172 drm_get_connector_status_name(status));
173}
174
175static ssize_t dpms_show(struct device *device,
176 struct device_attribute *attr,
177 char *buf)
178{
179 struct drm_connector *connector = to_drm_connector(device);
180 struct drm_device *dev = connector->dev;
181 uint64_t dpms_status;
182 int ret;
183
184 ret = drm_connector_property_get_value(connector,
185 dev->mode_config.dpms_property,
186 &dpms_status);
187 if (ret)
188 return 0;
189
190 return snprintf(buf, PAGE_SIZE, "%s\n",
191 drm_get_dpms_name((int)dpms_status));
192}
193
194static ssize_t enabled_show(struct device *device,
195 struct device_attribute *attr,
196 char *buf)
197{
198 struct drm_connector *connector = to_drm_connector(device);
199
200 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
201 "disabled");
202}
203
204static ssize_t edid_show(struct file *filp, struct kobject *kobj,
205 struct bin_attribute *attr, char *buf, loff_t off,
206 size_t count)
207{
208 struct device *connector_dev = container_of(kobj, struct device, kobj);
209 struct drm_connector *connector = to_drm_connector(connector_dev);
210 unsigned char *edid;
211 size_t size;
212
213 if (!connector->edid_blob_ptr)
214 return 0;
215
216 edid = connector->edid_blob_ptr->data;
217 size = connector->edid_blob_ptr->length;
218 if (!edid)
219 return 0;
220
221 if (off >= size)
222 return 0;
223
224 if (off + count > size)
225 count = size - off;
226 memcpy(buf, edid + off, count);
227
228 return count;
229}
230
231static ssize_t modes_show(struct device *device,
232 struct device_attribute *attr,
233 char *buf)
234{
235 struct drm_connector *connector = to_drm_connector(device);
236 struct drm_display_mode *mode;
237 int written = 0;
238
239 list_for_each_entry(mode, &connector->modes, head) {
240 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
241 mode->name);
242 }
243
244 return written;
245}
246
247static ssize_t subconnector_show(struct device *device,
248 struct device_attribute *attr,
249 char *buf)
250{
251 struct drm_connector *connector = to_drm_connector(device);
252 struct drm_device *dev = connector->dev;
253 struct drm_property *prop = NULL;
254 uint64_t subconnector;
255 int is_tv = 0;
256 int ret;
257
258 switch (connector->connector_type) {
259 case DRM_MODE_CONNECTOR_DVII:
260 prop = dev->mode_config.dvi_i_subconnector_property;
261 break;
262 case DRM_MODE_CONNECTOR_Composite:
263 case DRM_MODE_CONNECTOR_SVIDEO:
264 case DRM_MODE_CONNECTOR_Component:
265 case DRM_MODE_CONNECTOR_TV:
266 prop = dev->mode_config.tv_subconnector_property;
267 is_tv = 1;
268 break;
269 default:
270 DRM_ERROR("Wrong connector type for this property\n");
271 return 0;
272 }
273
274 if (!prop) {
275 DRM_ERROR("Unable to find subconnector property\n");
276 return 0;
277 }
278
279 ret = drm_connector_property_get_value(connector, prop, &subconnector);
280 if (ret)
281 return 0;
282
283 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
284 drm_get_tv_subconnector_name((int)subconnector) :
285 drm_get_dvi_i_subconnector_name((int)subconnector));
286}
287
288static ssize_t select_subconnector_show(struct device *device,
289 struct device_attribute *attr,
290 char *buf)
291{
292 struct drm_connector *connector = to_drm_connector(device);
293 struct drm_device *dev = connector->dev;
294 struct drm_property *prop = NULL;
295 uint64_t subconnector;
296 int is_tv = 0;
297 int ret;
298
299 switch (connector->connector_type) {
300 case DRM_MODE_CONNECTOR_DVII:
301 prop = dev->mode_config.dvi_i_select_subconnector_property;
302 break;
303 case DRM_MODE_CONNECTOR_Composite:
304 case DRM_MODE_CONNECTOR_SVIDEO:
305 case DRM_MODE_CONNECTOR_Component:
306 case DRM_MODE_CONNECTOR_TV:
307 prop = dev->mode_config.tv_select_subconnector_property;
308 is_tv = 1;
309 break;
310 default:
311 DRM_ERROR("Wrong connector type for this property\n");
312 return 0;
313 }
314
315 if (!prop) {
316 DRM_ERROR("Unable to find select subconnector property\n");
317 return 0;
318 }
319
320 ret = drm_connector_property_get_value(connector, prop, &subconnector);
321 if (ret)
322 return 0;
323
324 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
325 drm_get_tv_select_name((int)subconnector) :
326 drm_get_dvi_i_select_name((int)subconnector));
327}
328
329static struct device_attribute connector_attrs[] = {
330 __ATTR_RO(status),
331 __ATTR_RO(enabled),
332 __ATTR_RO(dpms),
333 __ATTR_RO(modes),
334};
335
336/* These attributes are for both DVI-I connectors and all types of tv-out. */
337static struct device_attribute connector_attrs_opt1[] = {
338 __ATTR_RO(subconnector),
339 __ATTR_RO(select_subconnector),
340};
341
342static struct bin_attribute edid_attr = {
343 .attr.name = "edid",
344 .attr.mode = 0444,
345 .size = 0,
346 .read = edid_show,
347};
348
349/**
350 * drm_sysfs_connector_add - add a connector to sysfs
351 * @connector: connector to add
352 *
353 * Create a connector device in sysfs, along with its associated connector
354 * properties (so far, connection status, dpms, mode list & edid) and
355 * generate a hotplug event so userspace knows there's a new connector
356 * available.
357 *
358 * Note:
359 * This routine should only be called *once* for each registered connector.
360 * A second call for an already registered connector will trigger the BUG_ON
361 * below.
362 */
363int drm_sysfs_connector_add(struct drm_connector *connector)
364{
365 struct drm_device *dev = connector->dev;
366 int attr_cnt = 0;
367 int opt_cnt = 0;
368 int i;
369 int ret;
370
371 /* We shouldn't get called more than once for the same connector */
372 BUG_ON(device_is_registered(&connector->kdev));
373
374 connector->kdev.parent = &dev->primary->kdev;
375 connector->kdev.class = drm_class;
376 connector->kdev.release = drm_sysfs_device_release;
377
378 DRM_DEBUG("adding \"%s\" to sysfs\n",
379 drm_get_connector_name(connector));
380
381 dev_set_name(&connector->kdev, "card%d-%s",
382 dev->primary->index, drm_get_connector_name(connector));
383 ret = device_register(&connector->kdev);
384
385 if (ret) {
386 DRM_ERROR("failed to register connector device: %d\n", ret);
387 goto out;
388 }
389
390 /* Standard attributes */
391
392 for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
393 ret = device_create_file(&connector->kdev, &connector_attrs[attr_cnt]);
394 if (ret)
395 goto err_out_files;
396 }
397
398 /* Optional attributes */
399 /*
400 * In the long run it maybe a good idea to make one set of
401 * optionals per connector type.
402 */
403 switch (connector->connector_type) {
404 case DRM_MODE_CONNECTOR_DVII:
405 case DRM_MODE_CONNECTOR_Composite:
406 case DRM_MODE_CONNECTOR_SVIDEO:
407 case DRM_MODE_CONNECTOR_Component:
408 case DRM_MODE_CONNECTOR_TV:
409 for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
410 ret = device_create_file(&connector->kdev, &connector_attrs_opt1[opt_cnt]);
411 if (ret)
412 goto err_out_files;
413 }
414 break;
415 default:
416 break;
417 }
418
419 ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
420 if (ret)
421 goto err_out_files;
422
423 /* Let userspace know we have a new connector */
424 drm_sysfs_hotplug_event(dev);
425
426 return 0;
427
428err_out_files:
429 for (i = 0; i < opt_cnt; i++)
430 device_remove_file(&connector->kdev, &connector_attrs_opt1[i]);
431 for (i = 0; i < attr_cnt; i++)
432 device_remove_file(&connector->kdev, &connector_attrs[i]);
433 device_unregister(&connector->kdev);
434
435out:
436 return ret;
437}
438EXPORT_SYMBOL(drm_sysfs_connector_add);
439
440/**
441 * drm_sysfs_connector_remove - remove an connector device from sysfs
442 * @connector: connector to remove
443 *
444 * Remove @connector and its associated attributes from sysfs. Note that
445 * the device model core will take care of sending the "remove" uevent
446 * at this time, so we don't need to do it.
447 *
448 * Note:
449 * This routine should only be called if the connector was previously
450 * successfully registered. If @connector hasn't been registered yet,
451 * you'll likely see a panic somewhere deep in sysfs code when called.
452 */
453void drm_sysfs_connector_remove(struct drm_connector *connector)
454{
455 int i;
456
457 if (!connector->kdev.parent)
458 return;
459 DRM_DEBUG("removing \"%s\" from sysfs\n",
460 drm_get_connector_name(connector));
461
462 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
463 device_remove_file(&connector->kdev, &connector_attrs[i]);
464 sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
465 device_unregister(&connector->kdev);
466 connector->kdev.parent = NULL;
467}
468EXPORT_SYMBOL(drm_sysfs_connector_remove);
469
470/**
471 * drm_sysfs_hotplug_event - generate a DRM uevent
472 * @dev: DRM device
473 *
474 * Send a uevent for the DRM device specified by @dev. Currently we only
475 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
476 * deal with other types of events.
477 */
478void drm_sysfs_hotplug_event(struct drm_device *dev)
479{
480 char *event_string = "HOTPLUG=1";
481 char *envp[] = { event_string, NULL };
482
483 DRM_DEBUG("generating hotplug event\n");
484
485 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
486}
487EXPORT_SYMBOL(drm_sysfs_hotplug_event);
488
489/**
490 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
491 * @dev: DRM device to be added
492 * @head: DRM head in question
493 *
494 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
495 * as the parent for the Linux device, and make sure it has a file containing
496 * the driver we're using (for userspace compatibility).
497 */
498int drm_sysfs_device_add(struct drm_minor *minor)
499{
500 int err;
501 char *minor_str;
502
503 minor->kdev.parent = minor->dev->dev;
504
505 minor->kdev.class = drm_class;
506 minor->kdev.release = drm_sysfs_device_release;
507 minor->kdev.devt = minor->device;
508 minor->kdev.type = &drm_sysfs_device_minor;
509 if (minor->type == DRM_MINOR_CONTROL)
510 minor_str = "controlD%d";
511 else if (minor->type == DRM_MINOR_RENDER)
512 minor_str = "renderD%d";
513 else
514 minor_str = "card%d";
515
516 dev_set_name(&minor->kdev, minor_str, minor->index);
517
518 err = device_register(&minor->kdev);
519 if (err) {
520 DRM_ERROR("device add failed: %d\n", err);
521 goto err_out;
522 }
523
524 return 0;
525
526err_out:
527 return err;
528}
529
530/**
531 * drm_sysfs_device_remove - remove DRM device
532 * @dev: DRM device to remove
533 *
534 * This call unregisters and cleans up a class device that was created with a
535 * call to drm_sysfs_device_add()
536 */
537void drm_sysfs_device_remove(struct drm_minor *minor)
538{
539 if (minor->kdev.parent)
540 device_unregister(&minor->kdev);
541 minor->kdev.parent = NULL;
542}
543
544
545/**
546 * drm_class_device_register - Register a struct device in the drm class.
547 *
548 * @dev: pointer to struct device to register.
549 *
550 * @dev should have all relevant members pre-filled with the exception
551 * of the class member. In particular, the device_type member must
552 * be set.
553 */
554
555int drm_class_device_register(struct device *dev)
556{
557 dev->class = drm_class;
558 return device_register(dev);
559}
560EXPORT_SYMBOL_GPL(drm_class_device_register);
561
562void drm_class_device_unregister(struct device *dev)
563{
564 return device_unregister(dev);
565}
566EXPORT_SYMBOL_GPL(drm_class_device_unregister);