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 /* Display the version of drm_core. This doesn't work right in current design */
23 static ssize_t version_show(struct class *dev, char *buf)
25 return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
26 CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
29 static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
32 * drm_sysfs_create - create a struct drm_sysfs_class structure
33 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
34 * @name: pointer to a string for the name of this class.
36 * This is used to create a struct drm_sysfs_class pointer that can then be used
37 * in calls to drm_sysfs_device_add().
39 * Note, the pointer created here is to be destroyed when finished by making a
40 * call to drm_sysfs_destroy().
42 struct class *drm_sysfs_create(struct module *owner, char *name)
46 class = class_create(owner, name);
50 class_create_file(class, &class_attr_version);
55 * drm_sysfs_destroy - destroys a struct drm_sysfs_class structure
56 * @cs: pointer to the struct drm_sysfs_class that is to be destroyed
58 * Note, the pointer to be destroyed must have been created with a call to
61 void drm_sysfs_destroy(struct class *class)
63 if ((class == NULL) || (IS_ERR(class)))
66 class_remove_file(class, &class_attr_version);
70 static ssize_t show_dri(struct class_device *class_device, char *buf)
72 drm_device_t * dev = ((drm_head_t *)class_get_devdata(class_device))->dev;
73 if (dev->driver->dri_library_name)
74 return dev->driver->dri_library_name(dev, buf);
75 return snprintf(buf, PAGE_SIZE, "%s\n", dev->driver->pci_driver.name);
78 static struct class_device_attribute class_device_attrs[] = {
79 __ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
83 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
84 * @cs: pointer to the struct class that this device should be registered to.
85 * @dev: the dev_t for the device to be added.
86 * @device: a pointer to a struct device that is assiociated with this class device.
87 * @fmt: string for the class device's name
89 * A struct class_device will be created in sysfs, registered to the specified
90 * class. A "dev" file will be created, showing the dev_t for the device. The
91 * pointer to the struct class_device will be returned from the call. Any further
92 * sysfs files that might be required can be created using this pointer.
93 * Note: the struct class passed to this function must have previously been
94 * created with a call to drm_sysfs_create().
96 struct class_device *drm_sysfs_device_add(struct class *cs, drm_head_t *head)
98 struct class_device *class_dev;
101 class_dev = class_device_create(cs, NULL,
102 MKDEV(DRM_MAJOR, head->minor),
103 &(head->dev->pdev)->dev,
104 "card%d", head->minor);
108 class_set_devdata(class_dev, head);
110 for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
111 class_device_create_file(class_dev, &class_device_attrs[i]);
116 * drm_sysfs_device_remove - removes a class device that was created with drm_sysfs_device_add()
117 * @dev: the dev_t of the device that was previously registered.
119 * This call unregisters and cleans up a class device that was created with a
120 * call to drm_sysfs_device_add()
122 void drm_sysfs_device_remove(struct class_device *class_dev)
126 for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
127 class_device_remove_file(class_dev, &class_device_attrs[i]);
128 class_device_unregister(class_dev);