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>
24 #include "drm_internal.h"
26 #define to_drm_minor(d) dev_get_drvdata(d)
27 #define to_drm_connector(d) dev_get_drvdata(d)
29 static struct device_type drm_sysfs_device_minor
= {
33 struct class *drm_class
;
36 * __drm_class_suspend - internal DRM class suspend routine
37 * @dev: Linux device to suspend
38 * @state: power state to enter
40 * Just figures out what the actual struct drm_device associated with
41 * @dev is and calls its suspend hook, if present.
43 static int __drm_class_suspend(struct device
*dev
, pm_message_t state
)
45 if (dev
->type
== &drm_sysfs_device_minor
) {
46 struct drm_minor
*drm_minor
= to_drm_minor(dev
);
47 struct drm_device
*drm_dev
= drm_minor
->dev
;
49 if (drm_minor
->type
== DRM_MINOR_LEGACY
&&
50 !drm_core_check_feature(drm_dev
, DRIVER_MODESET
) &&
51 drm_dev
->driver
->suspend
)
52 return drm_dev
->driver
->suspend(drm_dev
, state
);
58 * drm_class_suspend - internal DRM class suspend hook. Simply calls
59 * __drm_class_suspend() with the correct pm state.
60 * @dev: Linux device to suspend
62 static int drm_class_suspend(struct device
*dev
)
64 return __drm_class_suspend(dev
, PMSG_SUSPEND
);
68 * drm_class_freeze - internal DRM class freeze hook. Simply calls
69 * __drm_class_suspend() with the correct pm state.
70 * @dev: Linux device to freeze
72 static int drm_class_freeze(struct device
*dev
)
74 return __drm_class_suspend(dev
, PMSG_FREEZE
);
78 * drm_class_resume - DRM class resume hook
79 * @dev: Linux device to resume
81 * Just figures out what the actual struct drm_device associated with
82 * @dev is and calls its resume hook, if present.
84 static int drm_class_resume(struct device
*dev
)
86 if (dev
->type
== &drm_sysfs_device_minor
) {
87 struct drm_minor
*drm_minor
= to_drm_minor(dev
);
88 struct drm_device
*drm_dev
= drm_minor
->dev
;
90 if (drm_minor
->type
== DRM_MINOR_LEGACY
&&
91 !drm_core_check_feature(drm_dev
, DRIVER_MODESET
) &&
92 drm_dev
->driver
->resume
)
93 return drm_dev
->driver
->resume(drm_dev
);
98 static const struct dev_pm_ops drm_class_dev_pm_ops
= {
99 .suspend
= drm_class_suspend
,
100 .resume
= drm_class_resume
,
101 .freeze
= drm_class_freeze
,
104 static char *drm_devnode(struct device
*dev
, umode_t
*mode
)
106 return kasprintf(GFP_KERNEL
, "dri/%s", dev_name(dev
));
109 static CLASS_ATTR_STRING(version
, S_IRUGO
,
111 __stringify(CORE_MAJOR
) "."
112 __stringify(CORE_MINOR
) "."
113 __stringify(CORE_PATCHLEVEL
) " "
117 * drm_sysfs_init - initialize sysfs helpers
119 * This is used to create the DRM class, which is the implicit parent of any
120 * other top-level DRM sysfs objects.
122 * You must call drm_sysfs_destroy() to release the allocated resources.
124 * Return: 0 on success, negative error code on failure.
126 int drm_sysfs_init(void)
130 drm_class
= class_create(THIS_MODULE
, "drm");
131 if (IS_ERR(drm_class
))
132 return PTR_ERR(drm_class
);
134 drm_class
->pm
= &drm_class_dev_pm_ops
;
136 err
= class_create_file(drm_class
, &class_attr_version
.attr
);
138 class_destroy(drm_class
);
143 drm_class
->devnode
= drm_devnode
;
148 * drm_sysfs_destroy - destroys DRM class
150 * Destroy the DRM device class.
152 void drm_sysfs_destroy(void)
154 if (IS_ERR_OR_NULL(drm_class
))
156 class_remove_file(drm_class
, &class_attr_version
.attr
);
157 class_destroy(drm_class
);
162 * Connector properties
164 static ssize_t
status_store(struct device
*device
,
165 struct device_attribute
*attr
,
166 const char *buf
, size_t count
)
168 struct drm_connector
*connector
= to_drm_connector(device
);
169 struct drm_device
*dev
= connector
->dev
;
170 enum drm_connector_force old_force
;
173 ret
= mutex_lock_interruptible(&dev
->mode_config
.mutex
);
177 old_force
= connector
->force
;
179 if (sysfs_streq(buf
, "detect"))
180 connector
->force
= 0;
181 else if (sysfs_streq(buf
, "on"))
182 connector
->force
= DRM_FORCE_ON
;
183 else if (sysfs_streq(buf
, "on-digital"))
184 connector
->force
= DRM_FORCE_ON_DIGITAL
;
185 else if (sysfs_streq(buf
, "off"))
186 connector
->force
= DRM_FORCE_OFF
;
190 if (old_force
!= connector
->force
|| !connector
->force
) {
191 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
194 old_force
, connector
->force
);
196 connector
->funcs
->fill_modes(connector
,
197 dev
->mode_config
.max_width
,
198 dev
->mode_config
.max_height
);
201 mutex_unlock(&dev
->mode_config
.mutex
);
203 return ret
? ret
: count
;
206 static ssize_t
status_show(struct device
*device
,
207 struct device_attribute
*attr
,
210 struct drm_connector
*connector
= to_drm_connector(device
);
211 enum drm_connector_status status
;
213 status
= READ_ONCE(connector
->status
);
215 return snprintf(buf
, PAGE_SIZE
, "%s\n",
216 drm_get_connector_status_name(status
));
219 static ssize_t
dpms_show(struct device
*device
,
220 struct device_attribute
*attr
,
223 struct drm_connector
*connector
= to_drm_connector(device
);
226 dpms
= READ_ONCE(connector
->dpms
);
228 return snprintf(buf
, PAGE_SIZE
, "%s\n",
229 drm_get_dpms_name(dpms
));
232 static ssize_t
enabled_show(struct device
*device
,
233 struct device_attribute
*attr
,
236 struct drm_connector
*connector
= to_drm_connector(device
);
239 enabled
= READ_ONCE(connector
->encoder
);
241 return snprintf(buf
, PAGE_SIZE
, enabled
? "enabled\n" : "disabled\n");
244 static ssize_t
edid_show(struct file
*filp
, struct kobject
*kobj
,
245 struct bin_attribute
*attr
, char *buf
, loff_t off
,
248 struct device
*connector_dev
= kobj_to_dev(kobj
);
249 struct drm_connector
*connector
= to_drm_connector(connector_dev
);
254 mutex_lock(&connector
->dev
->mode_config
.mutex
);
255 if (!connector
->edid_blob_ptr
)
258 edid
= connector
->edid_blob_ptr
->data
;
259 size
= connector
->edid_blob_ptr
->length
;
266 if (off
+ count
> size
)
268 memcpy(buf
, edid
+ off
, count
);
272 mutex_unlock(&connector
->dev
->mode_config
.mutex
);
277 static ssize_t
modes_show(struct device
*device
,
278 struct device_attribute
*attr
,
281 struct drm_connector
*connector
= to_drm_connector(device
);
282 struct drm_display_mode
*mode
;
285 mutex_lock(&connector
->dev
->mode_config
.mutex
);
286 list_for_each_entry(mode
, &connector
->modes
, head
) {
287 written
+= snprintf(buf
+ written
, PAGE_SIZE
- written
, "%s\n",
290 mutex_unlock(&connector
->dev
->mode_config
.mutex
);
295 static DEVICE_ATTR_RW(status
);
296 static DEVICE_ATTR_RO(enabled
);
297 static DEVICE_ATTR_RO(dpms
);
298 static DEVICE_ATTR_RO(modes
);
300 static struct attribute
*connector_dev_attrs
[] = {
301 &dev_attr_status
.attr
,
302 &dev_attr_enabled
.attr
,
304 &dev_attr_modes
.attr
,
308 static struct bin_attribute edid_attr
= {
315 static struct bin_attribute
*connector_bin_attrs
[] = {
320 static const struct attribute_group connector_dev_group
= {
321 .attrs
= connector_dev_attrs
,
322 .bin_attrs
= connector_bin_attrs
,
325 static const struct attribute_group
*connector_dev_groups
[] = {
326 &connector_dev_group
,
331 * drm_sysfs_connector_add - add a connector to sysfs
332 * @connector: connector to add
334 * Create a connector device in sysfs, along with its associated connector
335 * properties (so far, connection status, dpms, mode list & edid) and
336 * generate a hotplug event so userspace knows there's a new connector
339 int drm_sysfs_connector_add(struct drm_connector
*connector
)
341 struct drm_device
*dev
= connector
->dev
;
347 device_create_with_groups(drm_class
, dev
->primary
->kdev
, 0,
348 connector
, connector_dev_groups
,
349 "card%d-%s", dev
->primary
->index
,
351 DRM_DEBUG("adding \"%s\" to sysfs\n",
354 if (IS_ERR(connector
->kdev
)) {
355 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector
->kdev
));
356 return PTR_ERR(connector
->kdev
);
359 /* Let userspace know we have a new connector */
360 drm_sysfs_hotplug_event(dev
);
366 * drm_sysfs_connector_remove - remove an connector device from sysfs
367 * @connector: connector to remove
369 * Remove @connector and its associated attributes from sysfs. Note that
370 * the device model core will take care of sending the "remove" uevent
371 * at this time, so we don't need to do it.
374 * This routine should only be called if the connector was previously
375 * successfully registered. If @connector hasn't been registered yet,
376 * you'll likely see a panic somewhere deep in sysfs code when called.
378 void drm_sysfs_connector_remove(struct drm_connector
*connector
)
380 if (!connector
->kdev
)
382 DRM_DEBUG("removing \"%s\" from sysfs\n",
385 device_unregister(connector
->kdev
);
386 connector
->kdev
= NULL
;
390 * drm_sysfs_hotplug_event - generate a DRM uevent
393 * Send a uevent for the DRM device specified by @dev. Currently we only
394 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
395 * deal with other types of events.
397 void drm_sysfs_hotplug_event(struct drm_device
*dev
)
399 char *event_string
= "HOTPLUG=1";
400 char *envp
[] = { event_string
, NULL
};
402 DRM_DEBUG("generating hotplug event\n");
404 kobject_uevent_env(&dev
->primary
->kdev
->kobj
, KOBJ_CHANGE
, envp
);
406 EXPORT_SYMBOL(drm_sysfs_hotplug_event
);
408 static void drm_sysfs_release(struct device
*dev
)
414 * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
415 * @minor: minor to allocate sysfs device for
417 * This allocates a new sysfs device for @minor and returns it. The device is
418 * not registered nor linked. The caller has to use device_add() and
419 * device_del() to register and unregister it.
421 * Note that dev_get_drvdata() on the new device will return the minor.
422 * However, the device does not hold a ref-count to the minor nor to the
423 * underlying drm_device. This is unproblematic as long as you access the
424 * private data only in sysfs callbacks. device_del() disables those
425 * synchronously, so they cannot be called after you cleanup a minor.
427 struct device
*drm_sysfs_minor_alloc(struct drm_minor
*minor
)
429 const char *minor_str
;
433 if (minor
->type
== DRM_MINOR_CONTROL
)
434 minor_str
= "controlD%d";
435 else if (minor
->type
== DRM_MINOR_RENDER
)
436 minor_str
= "renderD%d";
438 minor_str
= "card%d";
440 kdev
= kzalloc(sizeof(*kdev
), GFP_KERNEL
);
442 return ERR_PTR(-ENOMEM
);
444 device_initialize(kdev
);
445 kdev
->devt
= MKDEV(DRM_MAJOR
, minor
->index
);
446 kdev
->class = drm_class
;
447 kdev
->type
= &drm_sysfs_device_minor
;
448 kdev
->parent
= minor
->dev
->dev
;
449 kdev
->release
= drm_sysfs_release
;
450 dev_set_drvdata(kdev
, minor
);
452 r
= dev_set_name(kdev
, minor_str
, minor
->index
);
464 * drm_class_device_register - Register a struct device in the drm class.
466 * @dev: pointer to struct device to register.
468 * @dev should have all relevant members pre-filled with the exception
469 * of the class member. In particular, the device_type member must
473 int drm_class_device_register(struct device
*dev
)
475 if (!drm_class
|| IS_ERR(drm_class
))
478 dev
->class = drm_class
;
479 return device_register(dev
);
481 EXPORT_SYMBOL_GPL(drm_class_device_register
);
483 void drm_class_device_unregister(struct device
*dev
)
485 return device_unregister(dev
);
487 EXPORT_SYMBOL_GPL(drm_class_device_unregister
);