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);
212 return snprintf(buf, PAGE_SIZE, "%s\n",
213 drm_get_connector_status_name(connector->status));
216 static ssize_t dpms_show(struct device *device,
217 struct device_attribute *attr,
220 struct drm_connector *connector = to_drm_connector(device);
223 dpms = READ_ONCE(connector->dpms);
225 return snprintf(buf, PAGE_SIZE, "%s\n",
226 drm_get_dpms_name(dpms));
229 static ssize_t enabled_show(struct device *device,
230 struct device_attribute *attr,
233 struct drm_connector *connector = to_drm_connector(device);
235 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
239 static ssize_t edid_show(struct file *filp, struct kobject *kobj,
240 struct bin_attribute *attr, char *buf, loff_t off,
243 struct device *connector_dev = kobj_to_dev(kobj);
244 struct drm_connector *connector = to_drm_connector(connector_dev);
249 mutex_lock(&connector->dev->mode_config.mutex);
250 if (!connector->edid_blob_ptr)
253 edid = connector->edid_blob_ptr->data;
254 size = connector->edid_blob_ptr->length;
261 if (off + count > size)
263 memcpy(buf, edid + off, count);
267 mutex_unlock(&connector->dev->mode_config.mutex);
272 static ssize_t modes_show(struct device *device,
273 struct device_attribute *attr,
276 struct drm_connector *connector = to_drm_connector(device);
277 struct drm_display_mode *mode;
280 mutex_lock(&connector->dev->mode_config.mutex);
281 list_for_each_entry(mode, &connector->modes, head) {
282 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
285 mutex_unlock(&connector->dev->mode_config.mutex);
290 static DEVICE_ATTR_RW(status);
291 static DEVICE_ATTR_RO(enabled);
292 static DEVICE_ATTR_RO(dpms);
293 static DEVICE_ATTR_RO(modes);
295 static struct attribute *connector_dev_attrs[] = {
296 &dev_attr_status.attr,
297 &dev_attr_enabled.attr,
299 &dev_attr_modes.attr,
303 static struct bin_attribute edid_attr = {
310 static struct bin_attribute *connector_bin_attrs[] = {
315 static const struct attribute_group connector_dev_group = {
316 .attrs = connector_dev_attrs,
317 .bin_attrs = connector_bin_attrs,
320 static const struct attribute_group *connector_dev_groups[] = {
321 &connector_dev_group,
326 * drm_sysfs_connector_add - add a connector to sysfs
327 * @connector: connector to add
329 * Create a connector device in sysfs, along with its associated connector
330 * properties (so far, connection status, dpms, mode list & edid) and
331 * generate a hotplug event so userspace knows there's a new connector
334 int drm_sysfs_connector_add(struct drm_connector *connector)
336 struct drm_device *dev = connector->dev;
342 device_create_with_groups(drm_class, dev->primary->kdev, 0,
343 connector, connector_dev_groups,
344 "card%d-%s", dev->primary->index,
346 DRM_DEBUG("adding \"%s\" to sysfs\n",
349 if (IS_ERR(connector->kdev)) {
350 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
351 return PTR_ERR(connector->kdev);
354 /* Let userspace know we have a new connector */
355 drm_sysfs_hotplug_event(dev);
361 * drm_sysfs_connector_remove - remove an connector device from sysfs
362 * @connector: connector to remove
364 * Remove @connector and its associated attributes from sysfs. Note that
365 * the device model core will take care of sending the "remove" uevent
366 * at this time, so we don't need to do it.
369 * This routine should only be called if the connector was previously
370 * successfully registered. If @connector hasn't been registered yet,
371 * you'll likely see a panic somewhere deep in sysfs code when called.
373 void drm_sysfs_connector_remove(struct drm_connector *connector)
375 if (!connector->kdev)
377 DRM_DEBUG("removing \"%s\" from sysfs\n",
380 device_unregister(connector->kdev);
381 connector->kdev = NULL;
385 * drm_sysfs_hotplug_event - generate a DRM uevent
388 * Send a uevent for the DRM device specified by @dev. Currently we only
389 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
390 * deal with other types of events.
392 void drm_sysfs_hotplug_event(struct drm_device *dev)
394 char *event_string = "HOTPLUG=1";
395 char *envp[] = { event_string, NULL };
397 DRM_DEBUG("generating hotplug event\n");
399 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
401 EXPORT_SYMBOL(drm_sysfs_hotplug_event);
403 static void drm_sysfs_release(struct device *dev)
409 * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
410 * @minor: minor to allocate sysfs device for
412 * This allocates a new sysfs device for @minor and returns it. The device is
413 * not registered nor linked. The caller has to use device_add() and
414 * device_del() to register and unregister it.
416 * Note that dev_get_drvdata() on the new device will return the minor.
417 * However, the device does not hold a ref-count to the minor nor to the
418 * underlying drm_device. This is unproblematic as long as you access the
419 * private data only in sysfs callbacks. device_del() disables those
420 * synchronously, so they cannot be called after you cleanup a minor.
422 struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
424 const char *minor_str;
428 if (minor->type == DRM_MINOR_CONTROL)
429 minor_str = "controlD%d";
430 else if (minor->type == DRM_MINOR_RENDER)
431 minor_str = "renderD%d";
433 minor_str = "card%d";
435 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
437 return ERR_PTR(-ENOMEM);
439 device_initialize(kdev);
440 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
441 kdev->class = drm_class;
442 kdev->type = &drm_sysfs_device_minor;
443 kdev->parent = minor->dev->dev;
444 kdev->release = drm_sysfs_release;
445 dev_set_drvdata(kdev, minor);
447 r = dev_set_name(kdev, minor_str, minor->index);
459 * drm_class_device_register - Register a struct device in the drm class.
461 * @dev: pointer to struct device to register.
463 * @dev should have all relevant members pre-filled with the exception
464 * of the class member. In particular, the device_type member must
468 int drm_class_device_register(struct device *dev)
470 if (!drm_class || IS_ERR(drm_class))
473 dev->class = drm_class;
474 return device_register(dev);
476 EXPORT_SYMBOL_GPL(drm_class_device_register);
478 void drm_class_device_unregister(struct device *dev)
480 return device_unregister(dev);
482 EXPORT_SYMBOL_GPL(drm_class_device_unregister);