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>
20 #include "drm_sysfs.h"
24 #define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
25 #define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
27 static struct device_type drm_sysfs_device_minor
= {
32 * drm_class_suspend - DRM class suspend hook
33 * @dev: Linux device to suspend
34 * @state: power state to enter
36 * Just figures out what the actual struct drm_device associated with
37 * @dev is and calls its suspend hook, if present.
39 static int drm_class_suspend(struct device
*dev
, pm_message_t state
)
41 if (dev
->type
== &drm_sysfs_device_minor
) {
42 struct drm_minor
*drm_minor
= to_drm_minor(dev
);
43 struct drm_device
*drm_dev
= drm_minor
->dev
;
45 if (drm_minor
->type
== DRM_MINOR_LEGACY
&&
46 !drm_core_check_feature(drm_dev
, DRIVER_MODESET
) &&
47 drm_dev
->driver
->suspend
)
48 return drm_dev
->driver
->suspend(drm_dev
, state
);
54 * drm_class_resume - DRM class resume hook
55 * @dev: Linux device to resume
57 * Just figures out what the actual struct drm_device associated with
58 * @dev is and calls its resume hook, if present.
60 static int drm_class_resume(struct device
*dev
)
62 if (dev
->type
== &drm_sysfs_device_minor
) {
63 struct drm_minor
*drm_minor
= to_drm_minor(dev
);
64 struct drm_device
*drm_dev
= drm_minor
->dev
;
66 if (drm_minor
->type
== DRM_MINOR_LEGACY
&&
67 !drm_core_check_feature(drm_dev
, DRIVER_MODESET
) &&
68 drm_dev
->driver
->resume
)
69 return drm_dev
->driver
->resume(drm_dev
);
74 static char *drm_devnode(struct device
*dev
, mode_t
*mode
)
76 return kasprintf(GFP_KERNEL
, "dri/%s", dev_name(dev
));
79 static CLASS_ATTR_STRING(version
, S_IRUGO
,
81 __stringify(CORE_MAJOR
) "."
82 __stringify(CORE_MINOR
) "."
83 __stringify(CORE_PATCHLEVEL
) " "
87 * drm_sysfs_create - create a struct drm_sysfs_class structure
88 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
89 * @name: pointer to a string for the name of this class.
91 * This is used to create DRM class pointer that can then be used
92 * in calls to drm_sysfs_device_add().
94 * Note, the pointer created here is to be destroyed when finished by making a
95 * call to drm_sysfs_destroy().
97 struct class *drm_sysfs_create(struct module
*owner
, char *name
)
102 class = class_create(owner
, name
);
104 err
= PTR_ERR(class);
108 class->suspend
= drm_class_suspend
;
109 class->resume
= drm_class_resume
;
111 err
= class_create_file(class, &class_attr_version
.attr
);
115 class->devnode
= drm_devnode
;
120 class_destroy(class);
126 * drm_sysfs_destroy - destroys DRM class
128 * Destroy the DRM device class.
130 void drm_sysfs_destroy(void)
132 if ((drm_class
== NULL
) || (IS_ERR(drm_class
)))
134 class_remove_file(drm_class
, &class_attr_version
.attr
);
135 class_destroy(drm_class
);
139 * drm_sysfs_device_release - do nothing
142 * Normally, this would free the DRM device associated with @dev, along
143 * with cleaning up any other stuff. But we do that in the DRM core, so
144 * this function can just return and hope that the core does its job.
146 static void drm_sysfs_device_release(struct device
*dev
)
148 memset(dev
, 0, sizeof(struct device
));
153 * Connector properties
155 static ssize_t
status_show(struct device
*device
,
156 struct device_attribute
*attr
,
159 struct drm_connector
*connector
= to_drm_connector(device
);
160 enum drm_connector_status status
;
162 status
= connector
->funcs
->detect(connector
, true);
163 return snprintf(buf
, PAGE_SIZE
, "%s\n",
164 drm_get_connector_status_name(status
));
167 static ssize_t
dpms_show(struct device
*device
,
168 struct device_attribute
*attr
,
171 struct drm_connector
*connector
= to_drm_connector(device
);
172 struct drm_device
*dev
= connector
->dev
;
173 uint64_t dpms_status
;
176 ret
= drm_connector_property_get_value(connector
,
177 dev
->mode_config
.dpms_property
,
182 return snprintf(buf
, PAGE_SIZE
, "%s\n",
183 drm_get_dpms_name((int)dpms_status
));
186 static ssize_t
enabled_show(struct device
*device
,
187 struct device_attribute
*attr
,
190 struct drm_connector
*connector
= to_drm_connector(device
);
192 return snprintf(buf
, PAGE_SIZE
, "%s\n", connector
->encoder
? "enabled" :
196 static ssize_t
edid_show(struct file
*filp
, struct kobject
*kobj
,
197 struct bin_attribute
*attr
, char *buf
, loff_t off
,
200 struct device
*connector_dev
= container_of(kobj
, struct device
, kobj
);
201 struct drm_connector
*connector
= to_drm_connector(connector_dev
);
205 if (!connector
->edid_blob_ptr
)
208 edid
= connector
->edid_blob_ptr
->data
;
209 size
= connector
->edid_blob_ptr
->length
;
216 if (off
+ count
> size
)
218 memcpy(buf
, edid
+ off
, count
);
223 static ssize_t
modes_show(struct device
*device
,
224 struct device_attribute
*attr
,
227 struct drm_connector
*connector
= to_drm_connector(device
);
228 struct drm_display_mode
*mode
;
231 list_for_each_entry(mode
, &connector
->modes
, head
) {
232 written
+= snprintf(buf
+ written
, PAGE_SIZE
- written
, "%s\n",
239 static ssize_t
subconnector_show(struct device
*device
,
240 struct device_attribute
*attr
,
243 struct drm_connector
*connector
= to_drm_connector(device
);
244 struct drm_device
*dev
= connector
->dev
;
245 struct drm_property
*prop
= NULL
;
246 uint64_t subconnector
;
250 switch (connector
->connector_type
) {
251 case DRM_MODE_CONNECTOR_DVII
:
252 prop
= dev
->mode_config
.dvi_i_subconnector_property
;
254 case DRM_MODE_CONNECTOR_Composite
:
255 case DRM_MODE_CONNECTOR_SVIDEO
:
256 case DRM_MODE_CONNECTOR_Component
:
257 case DRM_MODE_CONNECTOR_TV
:
258 prop
= dev
->mode_config
.tv_subconnector_property
;
262 DRM_ERROR("Wrong connector type for this property\n");
267 DRM_ERROR("Unable to find subconnector property\n");
271 ret
= drm_connector_property_get_value(connector
, prop
, &subconnector
);
275 return snprintf(buf
, PAGE_SIZE
, "%s", is_tv
?
276 drm_get_tv_subconnector_name((int)subconnector
) :
277 drm_get_dvi_i_subconnector_name((int)subconnector
));
280 static ssize_t
select_subconnector_show(struct device
*device
,
281 struct device_attribute
*attr
,
284 struct drm_connector
*connector
= to_drm_connector(device
);
285 struct drm_device
*dev
= connector
->dev
;
286 struct drm_property
*prop
= NULL
;
287 uint64_t subconnector
;
291 switch (connector
->connector_type
) {
292 case DRM_MODE_CONNECTOR_DVII
:
293 prop
= dev
->mode_config
.dvi_i_select_subconnector_property
;
295 case DRM_MODE_CONNECTOR_Composite
:
296 case DRM_MODE_CONNECTOR_SVIDEO
:
297 case DRM_MODE_CONNECTOR_Component
:
298 case DRM_MODE_CONNECTOR_TV
:
299 prop
= dev
->mode_config
.tv_select_subconnector_property
;
303 DRM_ERROR("Wrong connector type for this property\n");
308 DRM_ERROR("Unable to find select subconnector property\n");
312 ret
= drm_connector_property_get_value(connector
, prop
, &subconnector
);
316 return snprintf(buf
, PAGE_SIZE
, "%s", is_tv
?
317 drm_get_tv_select_name((int)subconnector
) :
318 drm_get_dvi_i_select_name((int)subconnector
));
321 static struct device_attribute connector_attrs
[] = {
328 /* These attributes are for both DVI-I connectors and all types of tv-out. */
329 static struct device_attribute connector_attrs_opt1
[] = {
330 __ATTR_RO(subconnector
),
331 __ATTR_RO(select_subconnector
),
334 static struct bin_attribute edid_attr
= {
342 * drm_sysfs_connector_add - add an connector to sysfs
343 * @connector: connector to add
345 * Create an connector device in sysfs, along with its associated connector
346 * properties (so far, connection status, dpms, mode list & edid) and
347 * generate a hotplug event so userspace knows there's a new connector
351 * This routine should only be called *once* for each DRM minor registered.
352 * A second call for an already registered device will trigger the BUG_ON
355 int drm_sysfs_connector_add(struct drm_connector
*connector
)
357 struct drm_device
*dev
= connector
->dev
;
363 /* We shouldn't get called more than once for the same connector */
364 BUG_ON(device_is_registered(&connector
->kdev
));
366 connector
->kdev
.parent
= &dev
->primary
->kdev
;
367 connector
->kdev
.class = drm_class
;
368 connector
->kdev
.release
= drm_sysfs_device_release
;
370 DRM_DEBUG("adding \"%s\" to sysfs\n",
371 drm_get_connector_name(connector
));
373 dev_set_name(&connector
->kdev
, "card%d-%s",
374 dev
->primary
->index
, drm_get_connector_name(connector
));
375 ret
= device_register(&connector
->kdev
);
378 DRM_ERROR("failed to register connector device: %d\n", ret
);
382 /* Standard attributes */
384 for (attr_cnt
= 0; attr_cnt
< ARRAY_SIZE(connector_attrs
); attr_cnt
++) {
385 ret
= device_create_file(&connector
->kdev
, &connector_attrs
[attr_cnt
]);
390 /* Optional attributes */
392 * In the long run it maybe a good idea to make one set of
393 * optionals per connector type.
395 switch (connector
->connector_type
) {
396 case DRM_MODE_CONNECTOR_DVII
:
397 case DRM_MODE_CONNECTOR_Composite
:
398 case DRM_MODE_CONNECTOR_SVIDEO
:
399 case DRM_MODE_CONNECTOR_Component
:
400 case DRM_MODE_CONNECTOR_TV
:
401 for (opt_cnt
= 0; opt_cnt
< ARRAY_SIZE(connector_attrs_opt1
); opt_cnt
++) {
402 ret
= device_create_file(&connector
->kdev
, &connector_attrs_opt1
[opt_cnt
]);
411 ret
= sysfs_create_bin_file(&connector
->kdev
.kobj
, &edid_attr
);
415 /* Let userspace know we have a new connector */
416 drm_sysfs_hotplug_event(dev
);
421 for (i
= 0; i
< opt_cnt
; i
++)
422 device_remove_file(&connector
->kdev
, &connector_attrs_opt1
[i
]);
423 for (i
= 0; i
< attr_cnt
; i
++)
424 device_remove_file(&connector
->kdev
, &connector_attrs
[i
]);
425 device_unregister(&connector
->kdev
);
430 EXPORT_SYMBOL(drm_sysfs_connector_add
);
433 * drm_sysfs_connector_remove - remove an connector device from sysfs
434 * @connector: connector to remove
436 * Remove @connector and its associated attributes from sysfs. Note that
437 * the device model core will take care of sending the "remove" uevent
438 * at this time, so we don't need to do it.
441 * This routine should only be called if the connector was previously
442 * successfully registered. If @connector hasn't been registered yet,
443 * you'll likely see a panic somewhere deep in sysfs code when called.
445 void drm_sysfs_connector_remove(struct drm_connector
*connector
)
449 DRM_DEBUG("removing \"%s\" from sysfs\n",
450 drm_get_connector_name(connector
));
452 for (i
= 0; i
< ARRAY_SIZE(connector_attrs
); i
++)
453 device_remove_file(&connector
->kdev
, &connector_attrs
[i
]);
454 sysfs_remove_bin_file(&connector
->kdev
.kobj
, &edid_attr
);
455 device_unregister(&connector
->kdev
);
457 EXPORT_SYMBOL(drm_sysfs_connector_remove
);
460 * drm_sysfs_hotplug_event - generate a DRM uevent
463 * Send a uevent for the DRM device specified by @dev. Currently we only
464 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
465 * deal with other types of events.
467 void drm_sysfs_hotplug_event(struct drm_device
*dev
)
469 char *event_string
= "HOTPLUG=1";
470 char *envp
[] = { event_string
, NULL
};
472 DRM_DEBUG("generating hotplug event\n");
474 kobject_uevent_env(&dev
->primary
->kdev
.kobj
, KOBJ_CHANGE
, envp
);
476 EXPORT_SYMBOL(drm_sysfs_hotplug_event
);
479 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
480 * @dev: DRM device to be added
481 * @head: DRM head in question
483 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
484 * as the parent for the Linux device, and make sure it has a file containing
485 * the driver we're using (for userspace compatibility).
487 int drm_sysfs_device_add(struct drm_minor
*minor
)
492 minor
->kdev
.parent
= minor
->dev
->dev
;
494 minor
->kdev
.class = drm_class
;
495 minor
->kdev
.release
= drm_sysfs_device_release
;
496 minor
->kdev
.devt
= minor
->device
;
497 minor
->kdev
.type
= &drm_sysfs_device_minor
;
498 if (minor
->type
== DRM_MINOR_CONTROL
)
499 minor_str
= "controlD%d";
500 else if (minor
->type
== DRM_MINOR_RENDER
)
501 minor_str
= "renderD%d";
503 minor_str
= "card%d";
505 dev_set_name(&minor
->kdev
, minor_str
, minor
->index
);
507 err
= device_register(&minor
->kdev
);
509 DRM_ERROR("device add failed: %d\n", err
);
520 * drm_sysfs_device_remove - remove DRM device
521 * @dev: DRM device to remove
523 * This call unregisters and cleans up a class device that was created with a
524 * call to drm_sysfs_device_add()
526 void drm_sysfs_device_remove(struct drm_minor
*minor
)
528 device_unregister(&minor
->kdev
);
533 * drm_class_device_register - Register a struct device in the drm class.
535 * @dev: pointer to struct device to register.
537 * @dev should have all relevant members pre-filled with the exception
538 * of the class member. In particular, the device_type member must
542 int drm_class_device_register(struct device
*dev
)
544 dev
->class = drm_class
;
545 return device_register(dev
);
547 EXPORT_SYMBOL_GPL(drm_class_device_register
);
549 void drm_class_device_unregister(struct device
*dev
)
551 return device_unregister(dev
);
553 EXPORT_SYMBOL_GPL(drm_class_device_unregister
);