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_sysfs.h>
22 #include <drm/drm_core.h>
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)
28 static struct device_type drm_sysfs_device_minor
= {
33 * drm_class_suspend - DRM class suspend hook
34 * @dev: Linux device to suspend
35 * @state: power state to enter
37 * Just figures out what the actual struct drm_device associated with
38 * @dev is and calls its suspend hook, if present.
40 static int drm_class_suspend(struct device
*dev
, pm_message_t state
)
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
;
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
);
55 * drm_class_resume - DRM class resume hook
56 * @dev: Linux device to resume
58 * Just figures out what the actual struct drm_device associated with
59 * @dev is and calls its resume hook, if present.
61 static int drm_class_resume(struct device
*dev
)
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
;
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
);
75 static char *drm_devnode(struct device
*dev
, umode_t
*mode
)
77 return kasprintf(GFP_KERNEL
, "dri/%s", dev_name(dev
));
80 static CLASS_ATTR_STRING(version
, S_IRUGO
,
82 __stringify(CORE_MAJOR
) "."
83 __stringify(CORE_MINOR
) "."
84 __stringify(CORE_PATCHLEVEL
) " "
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.
92 * This is used to create DRM class pointer that can then be used
93 * in calls to drm_sysfs_device_add().
95 * Note, the pointer created here is to be destroyed when finished by making a
96 * call to drm_sysfs_destroy().
98 struct class *drm_sysfs_create(struct module
*owner
, char *name
)
103 class = class_create(owner
, name
);
105 err
= PTR_ERR(class);
109 class->suspend
= drm_class_suspend
;
110 class->resume
= drm_class_resume
;
112 err
= class_create_file(class, &class_attr_version
.attr
);
116 class->devnode
= drm_devnode
;
121 class_destroy(class);
127 * drm_sysfs_destroy - destroys DRM class
129 * Destroy the DRM device class.
131 void drm_sysfs_destroy(void)
133 if ((drm_class
== NULL
) || (IS_ERR(drm_class
)))
135 class_remove_file(drm_class
, &class_attr_version
.attr
);
136 class_destroy(drm_class
);
141 * drm_sysfs_device_release - do nothing
144 * Normally, this would free the DRM device associated with @dev, along
145 * with cleaning up any other stuff. But we do that in the DRM core, so
146 * this function can just return and hope that the core does its job.
148 static void drm_sysfs_device_release(struct device
*dev
)
150 memset(dev
, 0, sizeof(struct device
));
155 * Connector properties
157 static ssize_t
status_show(struct device
*device
,
158 struct device_attribute
*attr
,
161 struct drm_connector
*connector
= to_drm_connector(device
);
162 enum drm_connector_status status
;
165 ret
= mutex_lock_interruptible(&connector
->dev
->mode_config
.mutex
);
169 status
= connector
->funcs
->detect(connector
, true);
170 mutex_unlock(&connector
->dev
->mode_config
.mutex
);
172 return snprintf(buf
, PAGE_SIZE
, "%s\n",
173 drm_get_connector_status_name(status
));
176 static ssize_t
dpms_show(struct device
*device
,
177 struct device_attribute
*attr
,
180 struct drm_connector
*connector
= to_drm_connector(device
);
181 struct drm_device
*dev
= connector
->dev
;
182 uint64_t dpms_status
;
185 ret
= drm_object_property_get_value(&connector
->base
,
186 dev
->mode_config
.dpms_property
,
191 return snprintf(buf
, PAGE_SIZE
, "%s\n",
192 drm_get_dpms_name((int)dpms_status
));
195 static ssize_t
enabled_show(struct device
*device
,
196 struct device_attribute
*attr
,
199 struct drm_connector
*connector
= to_drm_connector(device
);
201 return snprintf(buf
, PAGE_SIZE
, "%s\n", connector
->encoder
? "enabled" :
205 static ssize_t
edid_show(struct file
*filp
, struct kobject
*kobj
,
206 struct bin_attribute
*attr
, char *buf
, loff_t off
,
209 struct device
*connector_dev
= container_of(kobj
, struct device
, kobj
);
210 struct drm_connector
*connector
= to_drm_connector(connector_dev
);
214 if (!connector
->edid_blob_ptr
)
217 edid
= connector
->edid_blob_ptr
->data
;
218 size
= connector
->edid_blob_ptr
->length
;
225 if (off
+ count
> size
)
227 memcpy(buf
, edid
+ off
, count
);
232 static ssize_t
modes_show(struct device
*device
,
233 struct device_attribute
*attr
,
236 struct drm_connector
*connector
= to_drm_connector(device
);
237 struct drm_display_mode
*mode
;
240 list_for_each_entry(mode
, &connector
->modes
, head
) {
241 written
+= snprintf(buf
+ written
, PAGE_SIZE
- written
, "%s\n",
248 static ssize_t
subconnector_show(struct device
*device
,
249 struct device_attribute
*attr
,
252 struct drm_connector
*connector
= to_drm_connector(device
);
253 struct drm_device
*dev
= connector
->dev
;
254 struct drm_property
*prop
= NULL
;
255 uint64_t subconnector
;
259 switch (connector
->connector_type
) {
260 case DRM_MODE_CONNECTOR_DVII
:
261 prop
= dev
->mode_config
.dvi_i_subconnector_property
;
263 case DRM_MODE_CONNECTOR_Composite
:
264 case DRM_MODE_CONNECTOR_SVIDEO
:
265 case DRM_MODE_CONNECTOR_Component
:
266 case DRM_MODE_CONNECTOR_TV
:
267 prop
= dev
->mode_config
.tv_subconnector_property
;
271 DRM_ERROR("Wrong connector type for this property\n");
276 DRM_ERROR("Unable to find subconnector property\n");
280 ret
= drm_object_property_get_value(&connector
->base
, prop
, &subconnector
);
284 return snprintf(buf
, PAGE_SIZE
, "%s", is_tv
?
285 drm_get_tv_subconnector_name((int)subconnector
) :
286 drm_get_dvi_i_subconnector_name((int)subconnector
));
289 static ssize_t
select_subconnector_show(struct device
*device
,
290 struct device_attribute
*attr
,
293 struct drm_connector
*connector
= to_drm_connector(device
);
294 struct drm_device
*dev
= connector
->dev
;
295 struct drm_property
*prop
= NULL
;
296 uint64_t subconnector
;
300 switch (connector
->connector_type
) {
301 case DRM_MODE_CONNECTOR_DVII
:
302 prop
= dev
->mode_config
.dvi_i_select_subconnector_property
;
304 case DRM_MODE_CONNECTOR_Composite
:
305 case DRM_MODE_CONNECTOR_SVIDEO
:
306 case DRM_MODE_CONNECTOR_Component
:
307 case DRM_MODE_CONNECTOR_TV
:
308 prop
= dev
->mode_config
.tv_select_subconnector_property
;
312 DRM_ERROR("Wrong connector type for this property\n");
317 DRM_ERROR("Unable to find select subconnector property\n");
321 ret
= drm_object_property_get_value(&connector
->base
, prop
, &subconnector
);
325 return snprintf(buf
, PAGE_SIZE
, "%s", is_tv
?
326 drm_get_tv_select_name((int)subconnector
) :
327 drm_get_dvi_i_select_name((int)subconnector
));
330 static struct device_attribute connector_attrs
[] = {
337 /* These attributes are for both DVI-I connectors and all types of tv-out. */
338 static struct device_attribute connector_attrs_opt1
[] = {
339 __ATTR_RO(subconnector
),
340 __ATTR_RO(select_subconnector
),
343 static struct bin_attribute edid_attr
= {
351 * drm_sysfs_connector_add - add a connector to sysfs
352 * @connector: connector to add
354 * Create a connector device in sysfs, along with its associated connector
355 * properties (so far, connection status, dpms, mode list & edid) and
356 * generate a hotplug event so userspace knows there's a new connector
360 * This routine should only be called *once* for each registered connector.
361 * A second call for an already registered connector will trigger the BUG_ON
364 int drm_sysfs_connector_add(struct drm_connector
*connector
)
366 struct drm_device
*dev
= connector
->dev
;
372 /* We shouldn't get called more than once for the same connector */
373 BUG_ON(device_is_registered(&connector
->kdev
));
375 connector
->kdev
.parent
= &dev
->primary
->kdev
;
376 connector
->kdev
.class = drm_class
;
377 connector
->kdev
.release
= drm_sysfs_device_release
;
379 DRM_DEBUG("adding \"%s\" to sysfs\n",
380 drm_get_connector_name(connector
));
382 dev_set_name(&connector
->kdev
, "card%d-%s",
383 dev
->primary
->index
, drm_get_connector_name(connector
));
384 ret
= device_register(&connector
->kdev
);
387 DRM_ERROR("failed to register connector device: %d\n", ret
);
391 /* Standard attributes */
393 for (attr_cnt
= 0; attr_cnt
< ARRAY_SIZE(connector_attrs
); attr_cnt
++) {
394 ret
= device_create_file(&connector
->kdev
, &connector_attrs
[attr_cnt
]);
399 /* Optional attributes */
401 * In the long run it maybe a good idea to make one set of
402 * optionals per connector type.
404 switch (connector
->connector_type
) {
405 case DRM_MODE_CONNECTOR_DVII
:
406 case DRM_MODE_CONNECTOR_Composite
:
407 case DRM_MODE_CONNECTOR_SVIDEO
:
408 case DRM_MODE_CONNECTOR_Component
:
409 case DRM_MODE_CONNECTOR_TV
:
410 for (opt_cnt
= 0; opt_cnt
< ARRAY_SIZE(connector_attrs_opt1
); opt_cnt
++) {
411 ret
= device_create_file(&connector
->kdev
, &connector_attrs_opt1
[opt_cnt
]);
420 ret
= sysfs_create_bin_file(&connector
->kdev
.kobj
, &edid_attr
);
424 /* Let userspace know we have a new connector */
425 drm_sysfs_hotplug_event(dev
);
430 for (i
= 0; i
< opt_cnt
; i
++)
431 device_remove_file(&connector
->kdev
, &connector_attrs_opt1
[i
]);
432 for (i
= 0; i
< attr_cnt
; i
++)
433 device_remove_file(&connector
->kdev
, &connector_attrs
[i
]);
434 device_unregister(&connector
->kdev
);
439 EXPORT_SYMBOL(drm_sysfs_connector_add
);
442 * drm_sysfs_connector_remove - remove an connector device from sysfs
443 * @connector: connector to remove
445 * Remove @connector and its associated attributes from sysfs. Note that
446 * the device model core will take care of sending the "remove" uevent
447 * at this time, so we don't need to do it.
450 * This routine should only be called if the connector was previously
451 * successfully registered. If @connector hasn't been registered yet,
452 * you'll likely see a panic somewhere deep in sysfs code when called.
454 void drm_sysfs_connector_remove(struct drm_connector
*connector
)
458 if (!connector
->kdev
.parent
)
460 DRM_DEBUG("removing \"%s\" from sysfs\n",
461 drm_get_connector_name(connector
));
463 for (i
= 0; i
< ARRAY_SIZE(connector_attrs
); i
++)
464 device_remove_file(&connector
->kdev
, &connector_attrs
[i
]);
465 sysfs_remove_bin_file(&connector
->kdev
.kobj
, &edid_attr
);
466 device_unregister(&connector
->kdev
);
467 connector
->kdev
.parent
= NULL
;
469 EXPORT_SYMBOL(drm_sysfs_connector_remove
);
472 * drm_sysfs_hotplug_event - generate a DRM uevent
475 * Send a uevent for the DRM device specified by @dev. Currently we only
476 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
477 * deal with other types of events.
479 void drm_sysfs_hotplug_event(struct drm_device
*dev
)
481 char *event_string
= "HOTPLUG=1";
482 char *envp
[] = { event_string
, NULL
};
484 DRM_DEBUG("generating hotplug event\n");
486 kobject_uevent_env(&dev
->primary
->kdev
.kobj
, KOBJ_CHANGE
, envp
);
488 EXPORT_SYMBOL(drm_sysfs_hotplug_event
);
491 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
492 * @dev: DRM device to be added
493 * @head: DRM head in question
495 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
496 * as the parent for the Linux device, and make sure it has a file containing
497 * the driver we're using (for userspace compatibility).
499 int drm_sysfs_device_add(struct drm_minor
*minor
)
504 minor
->kdev
.parent
= minor
->dev
->dev
;
506 minor
->kdev
.class = drm_class
;
507 minor
->kdev
.release
= drm_sysfs_device_release
;
508 minor
->kdev
.devt
= minor
->device
;
509 minor
->kdev
.type
= &drm_sysfs_device_minor
;
510 if (minor
->type
== DRM_MINOR_CONTROL
)
511 minor_str
= "controlD%d";
512 else if (minor
->type
== DRM_MINOR_RENDER
)
513 minor_str
= "renderD%d";
515 minor_str
= "card%d";
517 dev_set_name(&minor
->kdev
, minor_str
, minor
->index
);
519 err
= device_register(&minor
->kdev
);
521 DRM_ERROR("device add failed: %d\n", err
);
532 * drm_sysfs_device_remove - remove DRM device
533 * @dev: DRM device to remove
535 * This call unregisters and cleans up a class device that was created with a
536 * call to drm_sysfs_device_add()
538 void drm_sysfs_device_remove(struct drm_minor
*minor
)
540 if (minor
->kdev
.parent
)
541 device_unregister(&minor
->kdev
);
542 minor
->kdev
.parent
= NULL
;
547 * drm_class_device_register - Register a struct device in the drm class.
549 * @dev: pointer to struct device to register.
551 * @dev should have all relevant members pre-filled with the exception
552 * of the class member. In particular, the device_type member must
556 int drm_class_device_register(struct device
*dev
)
558 if (!drm_class
|| IS_ERR(drm_class
))
561 dev
->class = drm_class
;
562 return device_register(dev
);
564 EXPORT_SYMBOL_GPL(drm_class_device_register
);
566 void drm_class_device_unregister(struct device
*dev
)
568 return device_unregister(dev
);
570 EXPORT_SYMBOL_GPL(drm_class_device_unregister
);