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Commit | Line | Data |
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0650fd58 | 1 | |
1da177e4 LT |
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 | ||
1da177e4 LT |
15 | #include <linux/device.h> |
16 | #include <linux/kdev_t.h> | |
17 | #include <linux/err.h> | |
18 | ||
19 | #include "drm_core.h" | |
f210973b | 20 | #include "drmP.h" |
1da177e4 | 21 | |
2c14f28b | 22 | #define to_drm_minor(d) container_of(d, struct drm_minor, kdev) |
e8b962b6 JB |
23 | |
24 | /** | |
25 | * drm_sysfs_suspend - DRM class suspend hook | |
26 | * @dev: Linux device to suspend | |
27 | * @state: power state to enter | |
28 | * | |
29 | * Just figures out what the actual struct drm_device associated with | |
30 | * @dev is and calls its suspend hook, if present. | |
31 | */ | |
32 | static int drm_sysfs_suspend(struct device *dev, pm_message_t state) | |
33 | { | |
2c14f28b DA |
34 | struct drm_minor *drm_minor = to_drm_minor(dev); |
35 | struct drm_device *drm_dev = drm_minor->dev; | |
e8b962b6 | 36 | |
e8b962b6 | 37 | if (drm_dev->driver->suspend) |
b932ccb5 | 38 | return drm_dev->driver->suspend(drm_dev, state); |
e8b962b6 JB |
39 | |
40 | return 0; | |
41 | } | |
42 | ||
43 | /** | |
44 | * drm_sysfs_resume - DRM class resume hook | |
45 | * @dev: Linux device to resume | |
46 | * | |
47 | * Just figures out what the actual struct drm_device associated with | |
48 | * @dev is and calls its resume hook, if present. | |
49 | */ | |
50 | static int drm_sysfs_resume(struct device *dev) | |
51 | { | |
2c14f28b DA |
52 | struct drm_minor *drm_minor = to_drm_minor(dev); |
53 | struct drm_device *drm_dev = drm_minor->dev; | |
e8b962b6 JB |
54 | |
55 | if (drm_dev->driver->resume) | |
56 | return drm_dev->driver->resume(drm_dev); | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
1da177e4 LT |
61 | /* Display the version of drm_core. This doesn't work right in current design */ |
62 | static ssize_t version_show(struct class *dev, char *buf) | |
63 | { | |
64 | return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR, | |
65 | CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); | |
66 | } | |
67 | ||
68 | static CLASS_ATTR(version, S_IRUGO, version_show, NULL); | |
69 | ||
70 | /** | |
71 | * drm_sysfs_create - create a struct drm_sysfs_class structure | |
72 | * @owner: pointer to the module that is to "own" this struct drm_sysfs_class | |
73 | * @name: pointer to a string for the name of this class. | |
74 | * | |
e8b962b6 | 75 | * This is used to create DRM class pointer that can then be used |
1da177e4 LT |
76 | * in calls to drm_sysfs_device_add(). |
77 | * | |
78 | * Note, the pointer created here is to be destroyed when finished by making a | |
79 | * call to drm_sysfs_destroy(). | |
80 | */ | |
0650fd58 | 81 | struct class *drm_sysfs_create(struct module *owner, char *name) |
1da177e4 | 82 | { |
0650fd58 | 83 | struct class *class; |
24f73c92 | 84 | int err; |
0650fd58 GKH |
85 | |
86 | class = class_create(owner, name); | |
94f060bd AM |
87 | if (IS_ERR(class)) { |
88 | err = PTR_ERR(class); | |
24f73c92 JG |
89 | goto err_out; |
90 | } | |
91 | ||
e8b962b6 JB |
92 | class->suspend = drm_sysfs_suspend; |
93 | class->resume = drm_sysfs_resume; | |
94 | ||
24f73c92 JG |
95 | err = class_create_file(class, &class_attr_version); |
96 | if (err) | |
97 | goto err_out_class; | |
0650fd58 | 98 | |
0650fd58 | 99 | return class; |
24f73c92 JG |
100 | |
101 | err_out_class: | |
102 | class_destroy(class); | |
103 | err_out: | |
104 | return ERR_PTR(err); | |
1da177e4 LT |
105 | } |
106 | ||
107 | /** | |
e8b962b6 | 108 | * drm_sysfs_destroy - destroys DRM class |
1da177e4 | 109 | * |
e8b962b6 | 110 | * Destroy the DRM device class. |
1da177e4 | 111 | */ |
e8b962b6 | 112 | void drm_sysfs_destroy(void) |
1da177e4 | 113 | { |
e8b962b6 | 114 | if ((drm_class == NULL) || (IS_ERR(drm_class))) |
1da177e4 | 115 | return; |
e8b962b6 JB |
116 | class_remove_file(drm_class, &class_attr_version); |
117 | class_destroy(drm_class); | |
1da177e4 LT |
118 | } |
119 | ||
e8b962b6 JB |
120 | static ssize_t show_dri(struct device *device, struct device_attribute *attr, |
121 | char *buf) | |
732052ed | 122 | { |
2c14f28b DA |
123 | struct drm_minor *drm_minor = to_drm_minor(device); |
124 | struct drm_device *drm_dev = drm_minor->dev; | |
125 | if (drm_dev->driver->dri_library_name) | |
126 | return drm_dev->driver->dri_library_name(drm_dev, buf); | |
127 | return snprintf(buf, PAGE_SIZE, "%s\n", drm_dev->driver->pci_driver.name); | |
732052ed DA |
128 | } |
129 | ||
e8b962b6 | 130 | static struct device_attribute device_attrs[] = { |
732052ed DA |
131 | __ATTR(dri_library_name, S_IRUGO, show_dri, NULL), |
132 | }; | |
133 | ||
e8b962b6 JB |
134 | /** |
135 | * drm_sysfs_device_release - do nothing | |
136 | * @dev: Linux device | |
137 | * | |
138 | * Normally, this would free the DRM device associated with @dev, along | |
139 | * with cleaning up any other stuff. But we do that in the DRM core, so | |
140 | * this function can just return and hope that the core does its job. | |
141 | */ | |
142 | static void drm_sysfs_device_release(struct device *dev) | |
143 | { | |
144 | return; | |
145 | } | |
146 | ||
1da177e4 LT |
147 | /** |
148 | * drm_sysfs_device_add - adds a class device to sysfs for a character driver | |
e8b962b6 JB |
149 | * @dev: DRM device to be added |
150 | * @head: DRM head in question | |
1da177e4 | 151 | * |
e8b962b6 JB |
152 | * Add a DRM device to the DRM's device model class. We use @dev's PCI device |
153 | * as the parent for the Linux device, and make sure it has a file containing | |
154 | * the driver we're using (for userspace compatibility). | |
1da177e4 | 155 | */ |
2c14f28b | 156 | int drm_sysfs_device_add(struct drm_minor *minor) |
1da177e4 | 157 | { |
e8b962b6 JB |
158 | int err; |
159 | int i, j; | |
2c14f28b | 160 | char *minor_str; |
e8b962b6 | 161 | |
2c14f28b DA |
162 | minor->kdev.parent = &minor->dev->pdev->dev; |
163 | minor->kdev.class = drm_class; | |
164 | minor->kdev.release = drm_sysfs_device_release; | |
165 | minor->kdev.devt = minor->device; | |
166 | minor_str = "card%d"; | |
e8b962b6 | 167 | |
2c14f28b DA |
168 | snprintf(minor->kdev.bus_id, BUS_ID_SIZE, minor_str, minor->index); |
169 | ||
170 | err = device_register(&minor->kdev); | |
e8b962b6 JB |
171 | if (err) { |
172 | DRM_ERROR("device add failed: %d\n", err); | |
24f73c92 JG |
173 | goto err_out; |
174 | } | |
1da177e4 | 175 | |
e8b962b6 | 176 | for (i = 0; i < ARRAY_SIZE(device_attrs); i++) { |
2c14f28b | 177 | err = device_create_file(&minor->kdev, &device_attrs[i]); |
24f73c92 JG |
178 | if (err) |
179 | goto err_out_files; | |
180 | } | |
181 | ||
e8b962b6 | 182 | return 0; |
24f73c92 JG |
183 | |
184 | err_out_files: | |
185 | if (i > 0) | |
186 | for (j = 0; j < i; j++) | |
38eda211 | 187 | device_remove_file(&minor->kdev, &device_attrs[j]); |
2c14f28b | 188 | device_unregister(&minor->kdev); |
24f73c92 | 189 | err_out: |
e8b962b6 JB |
190 | |
191 | return err; | |
1da177e4 LT |
192 | } |
193 | ||
194 | /** | |
e8b962b6 JB |
195 | * drm_sysfs_device_remove - remove DRM device |
196 | * @dev: DRM device to remove | |
1da177e4 LT |
197 | * |
198 | * This call unregisters and cleans up a class device that was created with a | |
199 | * call to drm_sysfs_device_add() | |
200 | */ | |
2c14f28b | 201 | void drm_sysfs_device_remove(struct drm_minor *minor) |
1da177e4 | 202 | { |
732052ed DA |
203 | int i; |
204 | ||
e8b962b6 | 205 | for (i = 0; i < ARRAY_SIZE(device_attrs); i++) |
2c14f28b DA |
206 | device_remove_file(&minor->kdev, &device_attrs[i]); |
207 | device_unregister(&minor->kdev); | |
1da177e4 | 208 | } |