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.
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.
11 * This file is released under the GPLv2
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>
21 #include <drm/drm_edid.h>
22 #include <drm/drm_sysfs.h>
23 #include <drm/drm_core.h>
25 #include "drm_internal.h"
27 #define to_drm_minor(d) dev_get_drvdata(d)
28 #define to_drm_connector(d) dev_get_drvdata(d)
30 static struct device_type drm_sysfs_device_minor = {
34 struct class *drm_class;
36 static const char * const audioformatstr[] = {
38 "LPCM", /*AUDIO_LPCM = 1,*/
40 "MPEG1", /*AUDIO_MPEG1,*/
42 "MPEG2", /*AUDIO_MPEG2,*/
43 "AAC-LC", /*AUDIO_AAC_LC, AAC*/
45 "ATARC", /*AUDIO_ATARC,*/
46 "DSD", /*AUDIO_DSD, One bit Audio */
47 "E-AC3", /*AUDIO_E_AC3,*/
48 "DTS-HD", /*AUDIO_DTS_HD,*/
51 "WMA-PRO", /*AUDIO_WMA_PRO*/
55 * __drm_class_suspend - internal DRM class suspend routine
56 * @dev: Linux device to suspend
57 * @state: power state to enter
59 * Just figures out what the actual struct drm_device associated with
60 * @dev is and calls its suspend hook, if present.
62 static int __drm_class_suspend(struct device *dev, pm_message_t state)
64 if (dev->type == &drm_sysfs_device_minor) {
65 struct drm_minor *drm_minor = to_drm_minor(dev);
66 struct drm_device *drm_dev = drm_minor->dev;
68 if (drm_minor->type == DRM_MINOR_LEGACY &&
69 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
70 drm_dev->driver->suspend)
71 return drm_dev->driver->suspend(drm_dev, state);
77 * drm_class_suspend - internal DRM class suspend hook. Simply calls
78 * __drm_class_suspend() with the correct pm state.
79 * @dev: Linux device to suspend
81 static int drm_class_suspend(struct device *dev)
83 return __drm_class_suspend(dev, PMSG_SUSPEND);
87 * drm_class_freeze - internal DRM class freeze hook. Simply calls
88 * __drm_class_suspend() with the correct pm state.
89 * @dev: Linux device to freeze
91 static int drm_class_freeze(struct device *dev)
93 return __drm_class_suspend(dev, PMSG_FREEZE);
97 * drm_class_resume - DRM class resume hook
98 * @dev: Linux device to resume
100 * Just figures out what the actual struct drm_device associated with
101 * @dev is and calls its resume hook, if present.
103 static int drm_class_resume(struct device *dev)
105 if (dev->type == &drm_sysfs_device_minor) {
106 struct drm_minor *drm_minor = to_drm_minor(dev);
107 struct drm_device *drm_dev = drm_minor->dev;
109 if (drm_minor->type == DRM_MINOR_LEGACY &&
110 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
111 drm_dev->driver->resume)
112 return drm_dev->driver->resume(drm_dev);
117 static const struct dev_pm_ops drm_class_dev_pm_ops = {
118 .suspend = drm_class_suspend,
119 .resume = drm_class_resume,
120 .freeze = drm_class_freeze,
123 static char *drm_devnode(struct device *dev, umode_t *mode)
125 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
128 static CLASS_ATTR_STRING(version, S_IRUGO,
130 __stringify(CORE_MAJOR) "."
131 __stringify(CORE_MINOR) "."
132 __stringify(CORE_PATCHLEVEL) " "
136 * drm_sysfs_init - initialize sysfs helpers
138 * This is used to create the DRM class, which is the implicit parent of any
139 * other top-level DRM sysfs objects.
141 * You must call drm_sysfs_destroy() to release the allocated resources.
143 * Return: 0 on success, negative error code on failure.
145 int drm_sysfs_init(void)
149 drm_class = class_create(THIS_MODULE, "drm");
150 if (IS_ERR(drm_class))
151 return PTR_ERR(drm_class);
153 drm_class->pm = &drm_class_dev_pm_ops;
155 err = class_create_file(drm_class, &class_attr_version.attr);
157 class_destroy(drm_class);
162 drm_class->devnode = drm_devnode;
167 * drm_sysfs_destroy - destroys DRM class
169 * Destroy the DRM device class.
171 void drm_sysfs_destroy(void)
173 if (IS_ERR_OR_NULL(drm_class))
175 class_remove_file(drm_class, &class_attr_version.attr);
176 class_destroy(drm_class);
181 * Connector properties
183 static ssize_t status_store(struct device *device,
184 struct device_attribute *attr,
185 const char *buf, size_t count)
187 struct drm_connector *connector = to_drm_connector(device);
188 struct drm_device *dev = connector->dev;
189 enum drm_connector_status old_status;
192 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
196 old_status = connector->status;
198 if (sysfs_streq(buf, "detect")) {
199 connector->force = 0;
200 connector->status = connector->funcs->detect(connector, true);
201 } else if (sysfs_streq(buf, "on")) {
202 connector->force = DRM_FORCE_ON;
203 } else if (sysfs_streq(buf, "on-digital")) {
204 connector->force = DRM_FORCE_ON_DIGITAL;
205 } else if (sysfs_streq(buf, "off")) {
206 connector->force = DRM_FORCE_OFF;
210 if (ret == 0 && connector->force) {
211 if (connector->force == DRM_FORCE_ON ||
212 connector->force == DRM_FORCE_ON_DIGITAL)
213 connector->status = connector_status_connected;
215 connector->status = connector_status_disconnected;
216 if (connector->funcs->force)
217 connector->funcs->force(connector);
220 if (old_status != connector->status) {
221 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
224 old_status, connector->status);
226 dev->mode_config.delayed_event = true;
227 if (dev->mode_config.poll_enabled)
228 schedule_delayed_work(&dev->mode_config.output_poll_work,
232 mutex_unlock(&dev->mode_config.mutex);
234 return ret ? ret : count;
237 static ssize_t status_show(struct device *device,
238 struct device_attribute *attr,
241 struct drm_connector *connector = to_drm_connector(device);
243 return snprintf(buf, PAGE_SIZE, "%s\n",
244 drm_get_connector_status_name(connector->status));
247 static ssize_t dpms_show(struct device *device,
248 struct device_attribute *attr,
251 struct drm_connector *connector = to_drm_connector(device);
254 dpms = READ_ONCE(connector->dpms);
256 return snprintf(buf, PAGE_SIZE, "%s\n",
257 drm_get_dpms_name(dpms));
260 static ssize_t enabled_show(struct device *device,
261 struct device_attribute *attr,
264 struct drm_connector *connector = to_drm_connector(device);
266 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
270 static int drm_get_audio_format(struct edid *edid,
271 char *audioformat, int len)
273 int i, size = 0, num = 0;
274 struct cea_sad *sads;
276 memset(audioformat, 0, len);
277 num = drm_edid_to_sad(edid, &sads);
281 for (i = 0; i < num; i++) {
282 if (sads[i].format < 1 || sads[i].format > 14) {
283 DRM_ERROR("audio type unsupported.\n");
286 size = strlen(audioformatstr[sads[i].format]);
287 memcpy(audioformat, audioformatstr[sads[i].format], size);
288 audioformat[size] = ',';
289 audioformat += (size + 1);
294 static ssize_t audioformat_show(struct device *device,
295 struct device_attribute *attr,
298 char audioformat[200];
301 struct drm_connector *connector = to_drm_connector(device);
303 if (!connector->edid_blob_ptr)
306 edid = (struct edid *)connector->edid_blob_ptr->data;
307 ret = drm_get_audio_format(edid, audioformat, 200);
309 return snprintf(buf, PAGE_SIZE, "%s\n", audioformat);
314 static ssize_t edid_show(struct file *filp, struct kobject *kobj,
315 struct bin_attribute *attr, char *buf, loff_t off,
318 struct device *connector_dev = container_of(kobj, struct device, kobj);
319 struct drm_connector *connector = to_drm_connector(connector_dev);
323 if (!connector->edid_blob_ptr)
326 edid = connector->edid_blob_ptr->data;
327 size = connector->edid_blob_ptr->length;
334 if (off + count > size)
336 memcpy(buf, edid + off, count);
341 static ssize_t modes_show(struct device *device,
342 struct device_attribute *attr,
345 struct drm_connector *connector = to_drm_connector(device);
346 struct drm_display_mode *mode;
349 list_for_each_entry(mode, &connector->modes, head) {
350 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
352 written += snprintf(buf + written, PAGE_SIZE - written,
354 mode->hdisplay, mode->vdisplay,
355 interlaced ? "i" : "p",
356 drm_mode_vrefresh(mode));
362 static ssize_t mode_show(struct device *device,
363 struct device_attribute *attr,
366 struct drm_connector *connector = to_drm_connector(device);
367 struct drm_display_mode *mode;
368 struct drm_crtc_state *crtc_state;
372 if (!connector->state || !connector->state->crtc)
375 crtc_state = connector->state->crtc->state;
379 mode = &crtc_state->mode;
381 interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
382 written += snprintf(buf + written, PAGE_SIZE - written,
384 mode->hdisplay, mode->vdisplay,
385 interlaced ? "i" : "p",
386 drm_mode_vrefresh(mode));
391 static ssize_t tv_subconnector_show(struct device *device,
392 struct device_attribute *attr,
395 struct drm_connector *connector = to_drm_connector(device);
396 struct drm_device *dev = connector->dev;
397 struct drm_property *prop;
398 uint64_t subconnector;
401 prop = dev->mode_config.tv_subconnector_property;
403 DRM_ERROR("Unable to find subconnector property\n");
407 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
411 return snprintf(buf, PAGE_SIZE, "%s",
412 drm_get_tv_subconnector_name((int)subconnector));
415 static ssize_t tv_select_subconnector_show(struct device *device,
416 struct device_attribute *attr,
419 struct drm_connector *connector = to_drm_connector(device);
420 struct drm_device *dev = connector->dev;
421 struct drm_property *prop;
422 uint64_t subconnector;
425 prop = dev->mode_config.tv_select_subconnector_property;
427 DRM_ERROR("Unable to find select subconnector property\n");
431 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
435 return snprintf(buf, PAGE_SIZE, "%s",
436 drm_get_tv_select_name((int)subconnector));
439 static ssize_t dvii_subconnector_show(struct device *device,
440 struct device_attribute *attr,
443 struct drm_connector *connector = to_drm_connector(device);
444 struct drm_device *dev = connector->dev;
445 struct drm_property *prop;
446 uint64_t subconnector;
449 prop = dev->mode_config.dvi_i_subconnector_property;
451 DRM_ERROR("Unable to find subconnector property\n");
455 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
459 return snprintf(buf, PAGE_SIZE, "%s",
460 drm_get_dvi_i_subconnector_name((int)subconnector));
463 static ssize_t dvii_select_subconnector_show(struct device *device,
464 struct device_attribute *attr,
467 struct drm_connector *connector = to_drm_connector(device);
468 struct drm_device *dev = connector->dev;
469 struct drm_property *prop;
470 uint64_t subconnector;
473 prop = dev->mode_config.dvi_i_select_subconnector_property;
475 DRM_ERROR("Unable to find select subconnector property\n");
479 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
483 return snprintf(buf, PAGE_SIZE, "%s",
484 drm_get_dvi_i_select_name((int)subconnector));
487 static DEVICE_ATTR_RW(status);
488 static DEVICE_ATTR_RO(enabled);
489 static DEVICE_ATTR_RO(dpms);
490 static DEVICE_ATTR_RO(modes);
491 static DEVICE_ATTR_RO(mode);
492 static DEVICE_ATTR_RO(audioformat);
494 static struct attribute *connector_dev_attrs[] = {
495 &dev_attr_status.attr,
496 &dev_attr_enabled.attr,
498 &dev_attr_modes.attr,
500 &dev_attr_audioformat.attr,
504 static DEVICE_ATTR_RO(tv_subconnector);
505 static DEVICE_ATTR_RO(tv_select_subconnector);
507 static struct attribute *connector_tv_dev_attrs[] = {
508 &dev_attr_tv_subconnector.attr,
509 &dev_attr_tv_select_subconnector.attr,
513 static DEVICE_ATTR_RO(dvii_subconnector);
514 static DEVICE_ATTR_RO(dvii_select_subconnector);
516 static struct attribute *connector_dvii_dev_attrs[] = {
517 &dev_attr_dvii_subconnector.attr,
518 &dev_attr_dvii_select_subconnector.attr,
522 /* Connector type related helpers */
523 static int kobj_connector_type(struct kobject *kobj)
525 struct device *dev = kobj_to_dev(kobj);
526 struct drm_connector *connector = to_drm_connector(dev);
528 return connector->connector_type;
531 static umode_t connector_is_dvii(struct kobject *kobj,
532 struct attribute *attr, int idx)
534 return kobj_connector_type(kobj) == DRM_MODE_CONNECTOR_DVII ?
538 static umode_t connector_is_tv(struct kobject *kobj,
539 struct attribute *attr, int idx)
541 switch (kobj_connector_type(kobj)) {
542 case DRM_MODE_CONNECTOR_Composite:
543 case DRM_MODE_CONNECTOR_SVIDEO:
544 case DRM_MODE_CONNECTOR_Component:
545 case DRM_MODE_CONNECTOR_TV:
552 static struct bin_attribute edid_attr = {
559 static struct bin_attribute *connector_bin_attrs[] = {
564 static const struct attribute_group connector_dev_group = {
565 .attrs = connector_dev_attrs,
566 .bin_attrs = connector_bin_attrs,
569 static const struct attribute_group connector_tv_dev_group = {
570 .attrs = connector_tv_dev_attrs,
571 .is_visible = connector_is_tv,
574 static const struct attribute_group connector_dvii_dev_group = {
575 .attrs = connector_dvii_dev_attrs,
576 .is_visible = connector_is_dvii,
579 static const struct attribute_group *connector_dev_groups[] = {
580 &connector_dev_group,
581 &connector_tv_dev_group,
582 &connector_dvii_dev_group,
587 * drm_sysfs_connector_add - add a connector to sysfs
588 * @connector: connector to add
590 * Create a connector device in sysfs, along with its associated connector
591 * properties (so far, connection status, dpms, mode list & edid) and
592 * generate a hotplug event so userspace knows there's a new connector
595 int drm_sysfs_connector_add(struct drm_connector *connector)
597 struct drm_device *dev = connector->dev;
603 device_create_with_groups(drm_class, dev->primary->kdev, 0,
604 connector, connector_dev_groups,
605 "card%d-%s", dev->primary->index,
607 DRM_DEBUG("adding \"%s\" to sysfs\n",
610 if (IS_ERR(connector->kdev)) {
611 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
612 return PTR_ERR(connector->kdev);
615 /* Let userspace know we have a new connector */
616 drm_sysfs_hotplug_event(dev);
622 * drm_sysfs_connector_remove - remove an connector device from sysfs
623 * @connector: connector to remove
625 * Remove @connector and its associated attributes from sysfs. Note that
626 * the device model core will take care of sending the "remove" uevent
627 * at this time, so we don't need to do it.
630 * This routine should only be called if the connector was previously
631 * successfully registered. If @connector hasn't been registered yet,
632 * you'll likely see a panic somewhere deep in sysfs code when called.
634 void drm_sysfs_connector_remove(struct drm_connector *connector)
636 if (!connector->kdev)
638 DRM_DEBUG("removing \"%s\" from sysfs\n",
641 device_unregister(connector->kdev);
642 connector->kdev = NULL;
646 * drm_sysfs_hotplug_event - generate a DRM uevent
649 * Send a uevent for the DRM device specified by @dev. Currently we only
650 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
651 * deal with other types of events.
653 void drm_sysfs_hotplug_event(struct drm_device *dev)
655 char *event_string = "HOTPLUG=1";
656 char *envp[] = { event_string, NULL };
658 DRM_DEBUG("generating hotplug event\n");
660 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
662 EXPORT_SYMBOL(drm_sysfs_hotplug_event);
664 static void drm_sysfs_release(struct device *dev)
670 * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
671 * @minor: minor to allocate sysfs device for
673 * This allocates a new sysfs device for @minor and returns it. The device is
674 * not registered nor linked. The caller has to use device_add() and
675 * device_del() to register and unregister it.
677 * Note that dev_get_drvdata() on the new device will return the minor.
678 * However, the device does not hold a ref-count to the minor nor to the
679 * underlying drm_device. This is unproblematic as long as you access the
680 * private data only in sysfs callbacks. device_del() disables those
681 * synchronously, so they cannot be called after you cleanup a minor.
683 struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
685 const char *minor_str;
689 if (minor->type == DRM_MINOR_CONTROL)
690 minor_str = "controlD%d";
691 else if (minor->type == DRM_MINOR_RENDER)
692 minor_str = "renderD%d";
694 minor_str = "card%d";
696 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
698 return ERR_PTR(-ENOMEM);
700 device_initialize(kdev);
701 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
702 kdev->class = drm_class;
703 kdev->type = &drm_sysfs_device_minor;
704 kdev->parent = minor->dev->dev;
705 kdev->release = drm_sysfs_release;
706 dev_set_drvdata(kdev, minor);
708 r = dev_set_name(kdev, minor_str, minor->index);
720 * drm_class_device_register - Register a struct device in the drm class.
722 * @dev: pointer to struct device to register.
724 * @dev should have all relevant members pre-filled with the exception
725 * of the class member. In particular, the device_type member must
729 int drm_class_device_register(struct device *dev)
731 if (!drm_class || IS_ERR(drm_class))
734 dev->class = drm_class;
735 return device_register(dev);
737 EXPORT_SYMBOL_GPL(drm_class_device_register);
739 void drm_class_device_unregister(struct device *dev)
741 return device_unregister(dev);
743 EXPORT_SYMBOL_GPL(drm_class_device_unregister);