tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/device.h>
16#include <linux/kdev_t.h>
17#include <linux/err.h>
18
19#include "drm_core.h"
20#include "drmP.h"
21
22#define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
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 */
32static int drm_sysfs_suspend(struct device *dev, pm_message_t state)
33{
34 struct drm_minor *drm_minor = to_drm_minor(dev);
35 struct drm_device *drm_dev = drm_minor->dev;
36
37 printk(KERN_ERR "%s\n", __func__);
38
39 if (drm_dev->driver->suspend)
40 return drm_dev->driver->suspend(drm_dev, state);
41
42 return 0;
43}
44
45/**
46 * drm_sysfs_resume - DRM class resume hook
47 * @dev: Linux device to resume
48 *
49 * Just figures out what the actual struct drm_device associated with
50 * @dev is and calls its resume hook, if present.
51 */
52static int drm_sysfs_resume(struct device *dev)
53{
54 struct drm_minor *drm_minor = to_drm_minor(dev);
55 struct drm_device *drm_dev = drm_minor->dev;
56
57 if (drm_dev->driver->resume)
58 return drm_dev->driver->resume(drm_dev);
59
60 return 0;
61}
62
63/* Display the version of drm_core. This doesn't work right in current design */
64static ssize_t version_show(struct class *dev, char *buf)
65{
66 return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
67 CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
68}
69
70static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
71
72/**
73 * drm_sysfs_create - create a struct drm_sysfs_class structure
74 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
75 * @name: pointer to a string for the name of this class.
76 *
77 * This is used to create DRM class pointer that can then be used
78 * in calls to drm_sysfs_device_add().
79 *
80 * Note, the pointer created here is to be destroyed when finished by making a
81 * call to drm_sysfs_destroy().
82 */
83struct class *drm_sysfs_create(struct module *owner, char *name)
84{
85 struct class *class;
86 int err;
87
88 class = class_create(owner, name);
89 if (IS_ERR(class)) {
90 err = PTR_ERR(class);
91 goto err_out;
92 }
93
94 class->suspend = drm_sysfs_suspend;
95 class->resume = drm_sysfs_resume;
96
97 err = class_create_file(class, &class_attr_version);
98 if (err)
99 goto err_out_class;
100
101 return class;
102
103err_out_class:
104 class_destroy(class);
105err_out:
106 return ERR_PTR(err);
107}
108
109/**
110 * drm_sysfs_destroy - destroys DRM class
111 *
112 * Destroy the DRM device class.
113 */
114void drm_sysfs_destroy(void)
115{
116 if ((drm_class == NULL) || (IS_ERR(drm_class)))
117 return;
118 class_remove_file(drm_class, &class_attr_version);
119 class_destroy(drm_class);
120}
121
122static ssize_t show_dri(struct device *device, struct device_attribute *attr,
123 char *buf)
124{
125 struct drm_minor *drm_minor = to_drm_minor(device);
126 struct drm_device *drm_dev = drm_minor->dev;
127 if (drm_dev->driver->dri_library_name)
128 return drm_dev->driver->dri_library_name(drm_dev, buf);
129 return snprintf(buf, PAGE_SIZE, "%s\n", drm_dev->driver->pci_driver.name);
130}
131
132static struct device_attribute device_attrs[] = {
133 __ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
134};
135
136/**
137 * drm_sysfs_device_release - do nothing
138 * @dev: Linux device
139 *
140 * Normally, this would free the DRM device associated with @dev, along
141 * with cleaning up any other stuff. But we do that in the DRM core, so
142 * this function can just return and hope that the core does its job.
143 */
144static void drm_sysfs_device_release(struct device *dev)
145{
146 return;
147}
148
149/**
150 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
151 * @dev: DRM device to be added
152 * @head: DRM head in question
153 *
154 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
155 * as the parent for the Linux device, and make sure it has a file containing
156 * the driver we're using (for userspace compatibility).
157 */
158int drm_sysfs_device_add(struct drm_minor *minor)
159{
160 int err;
161 int i, j;
162 char *minor_str;
163
164 minor->kdev.parent = &minor->dev->pdev->dev;
165 minor->kdev.class = drm_class;
166 minor->kdev.release = drm_sysfs_device_release;
167 minor->kdev.devt = minor->device;
168 minor_str = "card%d";
169
170 snprintf(minor->kdev.bus_id, BUS_ID_SIZE, minor_str, minor->index);
171
172 err = device_register(&minor->kdev);
173 if (err) {
174 DRM_ERROR("device add failed: %d\n", err);
175 goto err_out;
176 }
177
178 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
179 err = device_create_file(&minor->kdev, &device_attrs[i]);
180 if (err)
181 goto err_out_files;
182 }
183
184 return 0;
185
186err_out_files:
187 if (i > 0)
188 for (j = 0; j < i; j++)
189 device_remove_file(&minor->kdev, &device_attrs[i]);
190 device_unregister(&minor->kdev);
191err_out:
192
193 return err;
194}
195
196/**
197 * drm_sysfs_device_remove - remove DRM device
198 * @dev: DRM device to remove
199 *
200 * This call unregisters and cleans up a class device that was created with a
201 * call to drm_sysfs_device_add()
202 */
203void drm_sysfs_device_remove(struct drm_minor *minor)
204{
205 int i;
206
207 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
208 device_remove_file(&minor->kdev, &device_attrs[i]);
209 device_unregister(&minor->kdev);
210}