[AVR32] ATSTK1002: Update defconfig
[linux/fpc-iii.git] / drivers / char / drm / drm_sysfs.c
blobcf4349b00b07474f21fb6168a6bed2fa1a10a8a3
2 /*
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>
19 #include "drm_core.h"
20 #include "drmP.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);
31 /**
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)
44 struct class *class;
45 int err;
47 class = class_create(owner, name);
48 if (IS_ERR(class)) {
49 err = PTR_ERR(class);
50 goto err_out;
53 err = class_create_file(class, &class_attr_version);
54 if (err)
55 goto err_out_class;
57 return class;
59 err_out_class:
60 class_destroy(class);
61 err_out:
62 return ERR_PTR(err);
65 /**
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
70 * drm_sysfs_create().
72 void drm_sysfs_destroy(struct class *class)
74 if ((class == NULL) || (IS_ERR(class)))
75 return;
77 class_remove_file(class, &class_attr_version);
78 class_destroy(class);
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),
93 /**
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;
110 int i, j, err;
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);
118 goto err_out;
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]);
126 if (err)
127 goto err_out_files;
130 return class_dev;
132 err_out_files:
133 if (i > 0)
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);
138 err_out:
139 return ERR_PTR(err);
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)
151 int i;
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);