tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
fork
Configure Feed
Select the types of activity you want to include in your feed.
1
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.
6 *
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.
10 *
11 * This file is released under the GPLv2
12 *
13 */
14
15#include <linux/config.h>
16#include <linux/device.h>
17#include <linux/kdev_t.h>
18#include <linux/err.h>
19
20#include "drm_core.h"
21#include "drmP.h"
22
23/* Display the version of drm_core. This doesn't work right in current design */
24static ssize_t version_show(struct class *dev, char *buf)
25{
26 return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
27 CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
28}
29
30static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
31
32/**
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.
36 *
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().
39 *
40 * Note, the pointer created here is to be destroyed when finished by making a
41 * call to drm_sysfs_destroy().
42 */
43struct class *drm_sysfs_create(struct module *owner, char *name)
44{
45 struct class *class;
46
47 class = class_create(owner, name);
48 if (!class)
49 return class;
50
51 class_create_file(class, &class_attr_version);
52 return class;
53}
54
55/**
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
58 *
59 * Note, the pointer to be destroyed must have been created with a call to
60 * drm_sysfs_create().
61 */
62void drm_sysfs_destroy(struct class *class)
63{
64 if ((class == NULL) || (IS_ERR(class)))
65 return;
66
67 class_remove_file(class, &class_attr_version);
68 class_destroy(class);
69}
70
71static ssize_t show_dri(struct class_device *class_device, char *buf)
72{
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);
77}
78
79static struct class_device_attribute class_device_attrs[] = {
80 __ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
81};
82
83/**
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
89 *
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().
96 */
97struct class_device *drm_sysfs_device_add(struct class *cs, drm_head_t *head)
98{
99 struct class_device *class_dev;
100 int i;
101
102 class_dev = class_device_create(cs, NULL,
103 MKDEV(DRM_MAJOR, head->minor),
104 &(head->dev->pdev)->dev,
105 "card%d", head->minor);
106 if (!class_dev)
107 return NULL;
108
109 class_set_devdata(class_dev, head);
110
111 for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
112 class_device_create_file(class_dev, &class_device_attrs[i]);
113 return class_dev;
114}
115
116/**
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.
119 *
120 * This call unregisters and cleans up a class device that was created with a
121 * call to drm_sysfs_device_add()
122 */
123void drm_sysfs_device_remove(struct class_device *class_dev)
124{
125 int i;
126
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);
130}