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/err.h>
22 #define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
23 #define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
26 * drm_sysfs_suspend - DRM class suspend hook
27 * @dev: Linux device to suspend
28 * @state: power state to enter
30 * Just figures out what the actual struct drm_device associated with
31 * @dev is and calls its suspend hook, if present.
33 static int drm_sysfs_suspend(struct device
*dev
, pm_message_t state
)
35 struct drm_minor
*drm_minor
= to_drm_minor(dev
);
36 struct drm_device
*drm_dev
= drm_minor
->dev
;
38 if (drm_minor
->type
== DRM_MINOR_LEGACY
&&
39 !drm_core_check_feature(drm_dev
, DRIVER_MODESET
) &&
40 drm_dev
->driver
->suspend
)
41 return drm_dev
->driver
->suspend(drm_dev
, state
);
47 * drm_sysfs_resume - DRM class resume hook
48 * @dev: Linux device to resume
50 * Just figures out what the actual struct drm_device associated with
51 * @dev is and calls its resume hook, if present.
53 static int drm_sysfs_resume(struct device
*dev
)
55 struct drm_minor
*drm_minor
= to_drm_minor(dev
);
56 struct drm_device
*drm_dev
= drm_minor
->dev
;
58 if (drm_minor
->type
== DRM_MINOR_LEGACY
&&
59 !drm_core_check_feature(drm_dev
, DRIVER_MODESET
) &&
60 drm_dev
->driver
->resume
)
61 return drm_dev
->driver
->resume(drm_dev
);
66 /* Display the version of drm_core. This doesn't work right in current design */
67 static ssize_t
version_show(struct class *dev
, char *buf
)
69 return sprintf(buf
, "%s %d.%d.%d %s\n", CORE_NAME
, CORE_MAJOR
,
70 CORE_MINOR
, CORE_PATCHLEVEL
, CORE_DATE
);
73 static CLASS_ATTR(version
, S_IRUGO
, version_show
, NULL
);
76 * drm_sysfs_create - create a struct drm_sysfs_class structure
77 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
78 * @name: pointer to a string for the name of this class.
80 * This is used to create DRM class pointer that can then be used
81 * in calls to drm_sysfs_device_add().
83 * Note, the pointer created here is to be destroyed when finished by making a
84 * call to drm_sysfs_destroy().
86 struct class *drm_sysfs_create(struct module
*owner
, char *name
)
91 class = class_create(owner
, name
);
97 class->suspend
= drm_sysfs_suspend
;
98 class->resume
= drm_sysfs_resume
;
100 err
= class_create_file(class, &class_attr_version
);
107 class_destroy(class);
113 * drm_sysfs_destroy - destroys DRM class
115 * Destroy the DRM device class.
117 void drm_sysfs_destroy(void)
119 if ((drm_class
== NULL
) || (IS_ERR(drm_class
)))
121 class_remove_file(drm_class
, &class_attr_version
);
122 class_destroy(drm_class
);
126 * drm_sysfs_device_release - do nothing
129 * Normally, this would free the DRM device associated with @dev, along
130 * with cleaning up any other stuff. But we do that in the DRM core, so
131 * this function can just return and hope that the core does its job.
133 static void drm_sysfs_device_release(struct device
*dev
)
135 memset(dev
, 0, sizeof(struct device
));
140 * Connector properties
142 static ssize_t
status_show(struct device
*device
,
143 struct device_attribute
*attr
,
146 struct drm_connector
*connector
= to_drm_connector(device
);
147 enum drm_connector_status status
;
149 status
= connector
->funcs
->detect(connector
);
150 return snprintf(buf
, PAGE_SIZE
, "%s",
151 drm_get_connector_status_name(status
));
154 static ssize_t
dpms_show(struct device
*device
,
155 struct device_attribute
*attr
,
158 struct drm_connector
*connector
= to_drm_connector(device
);
159 struct drm_device
*dev
= connector
->dev
;
160 uint64_t dpms_status
;
163 ret
= drm_connector_property_get_value(connector
,
164 dev
->mode_config
.dpms_property
,
169 return snprintf(buf
, PAGE_SIZE
, "%s",
170 drm_get_dpms_name((int)dpms_status
));
173 static ssize_t
enabled_show(struct device
*device
,
174 struct device_attribute
*attr
,
177 struct drm_connector
*connector
= to_drm_connector(device
);
179 return snprintf(buf
, PAGE_SIZE
, connector
->encoder
? "enabled" :
183 static ssize_t
edid_show(struct kobject
*kobj
, struct bin_attribute
*attr
,
184 char *buf
, loff_t off
, size_t count
)
186 struct device
*connector_dev
= container_of(kobj
, struct device
, kobj
);
187 struct drm_connector
*connector
= to_drm_connector(connector_dev
);
191 if (!connector
->edid_blob_ptr
)
194 edid
= connector
->edid_blob_ptr
->data
;
195 size
= connector
->edid_blob_ptr
->length
;
202 if (off
+ count
> size
)
204 memcpy(buf
, edid
+ off
, count
);
209 static ssize_t
modes_show(struct device
*device
,
210 struct device_attribute
*attr
,
213 struct drm_connector
*connector
= to_drm_connector(device
);
214 struct drm_display_mode
*mode
;
217 list_for_each_entry(mode
, &connector
->modes
, head
) {
218 written
+= snprintf(buf
+ written
, PAGE_SIZE
- written
, "%s\n",
225 static ssize_t
subconnector_show(struct device
*device
,
226 struct device_attribute
*attr
,
229 struct drm_connector
*connector
= to_drm_connector(device
);
230 struct drm_device
*dev
= connector
->dev
;
231 struct drm_property
*prop
= NULL
;
232 uint64_t subconnector
;
236 switch (connector
->connector_type
) {
237 case DRM_MODE_CONNECTOR_DVII
:
238 prop
= dev
->mode_config
.dvi_i_subconnector_property
;
240 case DRM_MODE_CONNECTOR_Composite
:
241 case DRM_MODE_CONNECTOR_SVIDEO
:
242 case DRM_MODE_CONNECTOR_Component
:
243 prop
= dev
->mode_config
.tv_subconnector_property
;
247 DRM_ERROR("Wrong connector type for this property\n");
252 DRM_ERROR("Unable to find subconnector property\n");
256 ret
= drm_connector_property_get_value(connector
, prop
, &subconnector
);
260 return snprintf(buf
, PAGE_SIZE
, "%s", is_tv
?
261 drm_get_tv_subconnector_name((int)subconnector
) :
262 drm_get_dvi_i_subconnector_name((int)subconnector
));
265 static ssize_t
select_subconnector_show(struct device
*device
,
266 struct device_attribute
*attr
,
269 struct drm_connector
*connector
= to_drm_connector(device
);
270 struct drm_device
*dev
= connector
->dev
;
271 struct drm_property
*prop
= NULL
;
272 uint64_t subconnector
;
276 switch (connector
->connector_type
) {
277 case DRM_MODE_CONNECTOR_DVII
:
278 prop
= dev
->mode_config
.dvi_i_select_subconnector_property
;
280 case DRM_MODE_CONNECTOR_Composite
:
281 case DRM_MODE_CONNECTOR_SVIDEO
:
282 case DRM_MODE_CONNECTOR_Component
:
283 prop
= dev
->mode_config
.tv_select_subconnector_property
;
287 DRM_ERROR("Wrong connector type for this property\n");
292 DRM_ERROR("Unable to find select subconnector property\n");
296 ret
= drm_connector_property_get_value(connector
, prop
, &subconnector
);
300 return snprintf(buf
, PAGE_SIZE
, "%s", is_tv
?
301 drm_get_tv_select_name((int)subconnector
) :
302 drm_get_dvi_i_select_name((int)subconnector
));
305 static struct device_attribute connector_attrs
[] = {
312 /* These attributes are for both DVI-I connectors and all types of tv-out. */
313 static struct device_attribute connector_attrs_opt1
[] = {
314 __ATTR_RO(subconnector
),
315 __ATTR_RO(select_subconnector
),
318 static struct bin_attribute edid_attr
= {
325 * drm_sysfs_connector_add - add an connector to sysfs
326 * @connector: connector to add
328 * Create an connector device in sysfs, along with its associated connector
329 * properties (so far, connection status, dpms, mode list & edid) and
330 * generate a hotplug event so userspace knows there's a new connector
334 * This routine should only be called *once* for each DRM minor registered.
335 * A second call for an already registered device will trigger the BUG_ON
338 int drm_sysfs_connector_add(struct drm_connector
*connector
)
340 struct drm_device
*dev
= connector
->dev
;
343 /* We shouldn't get called more than once for the same connector */
344 BUG_ON(device_is_registered(&connector
->kdev
));
346 connector
->kdev
.parent
= &dev
->primary
->kdev
;
347 connector
->kdev
.class = drm_class
;
348 connector
->kdev
.release
= drm_sysfs_device_release
;
350 DRM_DEBUG("adding \"%s\" to sysfs\n",
351 drm_get_connector_name(connector
));
353 dev_set_name(&connector
->kdev
, "card%d-%s",
354 dev
->primary
->index
, drm_get_connector_name(connector
));
355 ret
= device_register(&connector
->kdev
);
358 DRM_ERROR("failed to register connector device: %d\n", ret
);
362 /* Standard attributes */
364 for (i
= 0; i
< ARRAY_SIZE(connector_attrs
); i
++) {
365 ret
= device_create_file(&connector
->kdev
, &connector_attrs
[i
]);
370 /* Optional attributes */
372 * In the long run it maybe a good idea to make one set of
373 * optionals per connector type.
375 switch (connector
->connector_type
) {
376 case DRM_MODE_CONNECTOR_DVII
:
377 case DRM_MODE_CONNECTOR_Composite
:
378 case DRM_MODE_CONNECTOR_SVIDEO
:
379 case DRM_MODE_CONNECTOR_Component
:
380 for (i
= 0; i
< ARRAY_SIZE(connector_attrs_opt1
); i
++) {
381 ret
= device_create_file(&connector
->kdev
, &connector_attrs_opt1
[i
]);
390 ret
= sysfs_create_bin_file(&connector
->kdev
.kobj
, &edid_attr
);
394 /* Let userspace know we have a new connector */
395 drm_sysfs_hotplug_event(dev
);
401 for (j
= 0; j
< i
; j
++)
402 device_remove_file(&connector
->kdev
,
403 &connector_attrs
[i
]);
404 device_unregister(&connector
->kdev
);
409 EXPORT_SYMBOL(drm_sysfs_connector_add
);
412 * drm_sysfs_connector_remove - remove an connector device from sysfs
413 * @connector: connector to remove
415 * Remove @connector and its associated attributes from sysfs. Note that
416 * the device model core will take care of sending the "remove" uevent
417 * at this time, so we don't need to do it.
420 * This routine should only be called if the connector was previously
421 * successfully registered. If @connector hasn't been registered yet,
422 * you'll likely see a panic somewhere deep in sysfs code when called.
424 void drm_sysfs_connector_remove(struct drm_connector
*connector
)
428 DRM_DEBUG("removing \"%s\" from sysfs\n",
429 drm_get_connector_name(connector
));
431 for (i
= 0; i
< ARRAY_SIZE(connector_attrs
); i
++)
432 device_remove_file(&connector
->kdev
, &connector_attrs
[i
]);
433 sysfs_remove_bin_file(&connector
->kdev
.kobj
, &edid_attr
);
434 device_unregister(&connector
->kdev
);
436 EXPORT_SYMBOL(drm_sysfs_connector_remove
);
439 * drm_sysfs_hotplug_event - generate a DRM uevent
442 * Send a uevent for the DRM device specified by @dev. Currently we only
443 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
444 * deal with other types of events.
446 void drm_sysfs_hotplug_event(struct drm_device
*dev
)
448 char *event_string
= "HOTPLUG=1";
449 char *envp
[] = { event_string
, NULL
};
451 DRM_DEBUG("generating hotplug event\n");
453 kobject_uevent_env(&dev
->primary
->kdev
.kobj
, KOBJ_CHANGE
, envp
);
455 EXPORT_SYMBOL(drm_sysfs_hotplug_event
);
458 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
459 * @dev: DRM device to be added
460 * @head: DRM head in question
462 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
463 * as the parent for the Linux device, and make sure it has a file containing
464 * the driver we're using (for userspace compatibility).
466 int drm_sysfs_device_add(struct drm_minor
*minor
)
471 minor
->kdev
.parent
= &minor
->dev
->pdev
->dev
;
472 minor
->kdev
.class = drm_class
;
473 minor
->kdev
.release
= drm_sysfs_device_release
;
474 minor
->kdev
.devt
= minor
->device
;
475 if (minor
->type
== DRM_MINOR_CONTROL
)
476 minor_str
= "controlD%d";
477 else if (minor
->type
== DRM_MINOR_RENDER
)
478 minor_str
= "renderD%d";
480 minor_str
= "card%d";
482 dev_set_name(&minor
->kdev
, minor_str
, minor
->index
);
484 err
= device_register(&minor
->kdev
);
486 DRM_ERROR("device add failed: %d\n", err
);
492 device_unregister(&minor
->kdev
);
499 * drm_sysfs_device_remove - remove DRM device
500 * @dev: DRM device to remove
502 * This call unregisters and cleans up a class device that was created with a
503 * call to drm_sysfs_device_add()
505 void drm_sysfs_device_remove(struct drm_minor
*minor
)
507 device_unregister(&minor
->kdev
);