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
)
47 class = class_create(owner
, name
);
53 err
= class_create_file(class, &class_attr_version
);
66 * drm_sysfs_destroy - destroys a struct drm_sysfs_class structure
67 * @cs: pointer to the struct drm_sysfs_class that is to be destroyed
69 * Note, the pointer to be destroyed must have been created with a call to
72 void drm_sysfs_destroy(struct class *class)
74 if ((class == NULL
) || (IS_ERR(class)))
77 class_remove_file(class, &class_attr_version
);
81 static ssize_t
show_dri(struct class_device
*class_device
, char *buf
)
83 struct drm_device
* dev
= ((struct drm_head
*)class_get_devdata(class_device
))->dev
;
84 if (dev
->driver
->dri_library_name
)
85 return dev
->driver
->dri_library_name(dev
, buf
);
86 return snprintf(buf
, PAGE_SIZE
, "%s\n", dev
->driver
->pci_driver
.name
);
89 static struct class_device_attribute class_device_attrs
[] = {
90 __ATTR(dri_library_name
, S_IRUGO
, show_dri
, NULL
),
94 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
95 * @cs: pointer to the struct class that this device should be registered to.
96 * @dev: the dev_t for the device to be added.
97 * @device: a pointer to a struct device that is assiociated with this class device.
98 * @fmt: string for the class device's name
100 * A struct class_device will be created in sysfs, registered to the specified
101 * class. A "dev" file will be created, showing the dev_t for the device. The
102 * pointer to the struct class_device will be returned from the call. Any further
103 * sysfs files that might be required can be created using this pointer.
104 * Note: the struct class passed to this function must have previously been
105 * created with a call to drm_sysfs_create().
107 struct class_device
*drm_sysfs_device_add(struct class *cs
, struct drm_head
*head
)
109 struct class_device
*class_dev
;
112 class_dev
= class_device_create(cs
, NULL
,
113 MKDEV(DRM_MAJOR
, head
->minor
),
114 &(head
->dev
->pdev
)->dev
,
115 "card%d", head
->minor
);
116 if (IS_ERR(class_dev
)) {
117 err
= PTR_ERR(class_dev
);
121 class_set_devdata(class_dev
, head
);
123 for (i
= 0; i
< ARRAY_SIZE(class_device_attrs
); i
++) {
124 err
= class_device_create_file(class_dev
,
125 &class_device_attrs
[i
]);
134 for (j
= 0; j
< i
; j
++)
135 class_device_remove_file(class_dev
,
136 &class_device_attrs
[i
]);
137 class_device_unregister(class_dev
);
143 * drm_sysfs_device_remove - removes a class device that was created with drm_sysfs_device_add()
144 * @dev: the dev_t of the device that was previously registered.
146 * This call unregisters and cleans up a class device that was created with a
147 * call to drm_sysfs_device_add()
149 void drm_sysfs_device_remove(struct class_device
*class_dev
)
153 for (i
= 0; i
< ARRAY_SIZE(class_device_attrs
); i
++)
154 class_device_remove_file(class_dev
, &class_device_attrs
[i
]);
155 class_device_unregister(class_dev
);