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/config.h>
16 #include <linux/device.h>
17 #include <linux/kdev_t.h>
18 #include <linux/err.h>
23 /* Display the version of drm_core. This doesn't work right in current design */
24 static ssize_t version_show(struct class *dev, char *buf)
26 return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
27 CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
30 static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
33 * drm_sysfs_create - create a struct drm_sysfs_class structure
34 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
35 * @name: pointer to a string for the name of this class.
37 * This is used to create a struct drm_sysfs_class pointer that can then be used
38 * in calls to drm_sysfs_device_add().
40 * Note, the pointer created here is to be destroyed when finished by making a
41 * call to drm_sysfs_destroy().
43 struct class *drm_sysfs_create(struct module *owner, char *name)
47 class = class_create(owner, name);
51 class_create_file(class, &class_attr_version);
56 * drm_sysfs_destroy - destroys a struct drm_sysfs_class structure
57 * @cs: pointer to the struct drm_sysfs_class that is to be destroyed
59 * Note, the pointer to be destroyed must have been created with a call to
62 void drm_sysfs_destroy(struct class *class)
64 if ((class == NULL) || (IS_ERR(class)))
67 class_remove_file(class, &class_attr_version);
71 static ssize_t show_dri(struct class_device *class_device, char *buf)
73 drm_device_t * dev = ((drm_head_t *)class_get_devdata(class_device))->dev;
74 if (dev->driver->dri_library_name)
75 return dev->driver->dri_library_name(dev, buf);
76 return snprintf(buf, PAGE_SIZE, "%s\n", dev->driver->pci_driver.name);
79 static struct class_device_attribute class_device_attrs[] = {
80 __ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
84 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
85 * @cs: pointer to the struct class that this device should be registered to.
86 * @dev: the dev_t for the device to be added.
87 * @device: a pointer to a struct device that is assiociated with this class device.
88 * @fmt: string for the class device's name
90 * A struct class_device will be created in sysfs, registered to the specified
91 * class. A "dev" file will be created, showing the dev_t for the device. The
92 * pointer to the struct class_device will be returned from the call. Any further
93 * sysfs files that might be required can be created using this pointer.
94 * Note: the struct class passed to this function must have previously been
95 * created with a call to drm_sysfs_create().
97 struct class_device *drm_sysfs_device_add(struct class *cs, drm_head_t *head)
99 struct class_device *class_dev;
102 class_dev = class_device_create(cs, NULL,
103 MKDEV(DRM_MAJOR, head->minor),
104 &(head->dev->pdev)->dev,
105 "card%d", head->minor);
109 class_set_devdata(class_dev, head);
111 for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
112 class_device_create_file(class_dev, &class_device_attrs[i]);
117 * drm_sysfs_device_remove - removes a class device that was created with drm_sysfs_device_add()
118 * @dev: the dev_t of the device that was previously registered.
120 * This call unregisters and cleans up a class device that was created with a
121 * call to drm_sysfs_device_add()
123 void drm_sysfs_device_remove(struct class_device *class_dev)
127 for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
128 class_device_remove_file(class_dev, &class_device_attrs[i]);
129 class_device_unregister(class_dev);