1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
/*
* drm_sysfs.c - Modifications to drm_sysfs_class.c to support
* extra sysfs attribute from DRM. Normal drm_sysfs_class
* does not allow adding attributes.
*
* Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
* Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (c) 2003-2004 IBM Corp.
*
* This file is released under the GPLv2
*
*/
#include <linux/device.h>
#include <linux/kdev_t.h>
#include <linux/err.h>
#include "drm_core.h"
#include "drmP.h"
#define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
/**
* drm_sysfs_suspend - DRM class suspend hook
* @dev: Linux device to suspend
* @state: power state to enter
*
* Just figures out what the actual struct drm_device associated with
* @dev is and calls its suspend hook, if present.
*/
static int drm_sysfs_suspend(struct device *dev, pm_message_t state)
{
struct drm_minor *drm_minor = to_drm_minor(dev);
struct drm_device *drm_dev = drm_minor->dev;
printk(KERN_ERR "%s\n", __FUNCTION__);
if (drm_dev->driver->suspend)
return drm_dev->driver->suspend(drm_dev, state);
return 0;
}
/**
* drm_sysfs_resume - DRM class resume hook
* @dev: Linux device to resume
*
* Just figures out what the actual struct drm_device associated with
* @dev is and calls its resume hook, if present.
*/
static int drm_sysfs_resume(struct device *dev)
{
struct drm_minor *drm_minor = to_drm_minor(dev);
struct drm_device *drm_dev = drm_minor->dev;
if (drm_dev->driver->resume)
return drm_dev->driver->resume(drm_dev);
return 0;
}
/* Display the version of drm_core. This doesn't work right in current design */
static ssize_t version_show(struct class *dev, char *buf)
{
return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
}
static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
/**
* drm_sysfs_create - create a struct drm_sysfs_class structure
* @owner: pointer to the module that is to "own" this struct drm_sysfs_class
* @name: pointer to a string for the name of this class.
*
* This is used to create DRM class pointer that can then be used
* in calls to drm_sysfs_device_add().
*
* Note, the pointer created here is to be destroyed when finished by making a
* call to drm_sysfs_destroy().
*/
struct class *drm_sysfs_create(struct module *owner, char *name)
{
struct class *class;
int err;
class = class_create(owner, name);
if (IS_ERR(class)) {
err = PTR_ERR(class);
goto err_out;
}
class->suspend = drm_sysfs_suspend;
class->resume = drm_sysfs_resume;
err = class_create_file(class, &class_attr_version);
if (err)
goto err_out_class;
return class;
err_out_class:
class_destroy(class);
err_out:
return ERR_PTR(err);
}
/**
* drm_sysfs_destroy - destroys DRM class
*
* Destroy the DRM device class.
*/
void drm_sysfs_destroy(void)
{
if ((drm_class == NULL) || (IS_ERR(drm_class)))
return;
class_remove_file(drm_class, &class_attr_version);
class_destroy(drm_class);
}
static ssize_t show_dri(struct device *device, struct device_attribute *attr,
char *buf)
{
struct drm_minor *drm_minor = to_drm_minor(device);
struct drm_device *drm_dev = drm_minor->dev;
if (drm_dev->driver->dri_library_name)
return drm_dev->driver->dri_library_name(drm_dev, buf);
return snprintf(buf, PAGE_SIZE, "%s\n", drm_dev->driver->pci_driver.name);
}
static struct device_attribute device_attrs[] = {
__ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
};
/**
* drm_sysfs_device_release - do nothing
* @dev: Linux device
*
* Normally, this would free the DRM device associated with @dev, along
* with cleaning up any other stuff. But we do that in the DRM core, so
* this function can just return and hope that the core does its job.
*/
static void drm_sysfs_device_release(struct device *dev)
{
return;
}
/**
* drm_sysfs_device_add - adds a class device to sysfs for a character driver
* @dev: DRM device to be added
* @head: DRM head in question
*
* Add a DRM device to the DRM's device model class. We use @dev's PCI device
* as the parent for the Linux device, and make sure it has a file containing
* the driver we're using (for userspace compatibility).
*/
int drm_sysfs_device_add(struct drm_minor *minor)
{
int err;
int i, j;
char *minor_str;
minor->kdev.parent = &minor->dev->pdev->dev;
minor->kdev.class = drm_class;
minor->kdev.release = drm_sysfs_device_release;
minor->kdev.devt = minor->device;
minor_str = "card%d";
snprintf(minor->kdev.bus_id, BUS_ID_SIZE, minor_str, minor->index);
err = device_register(&minor->kdev);
if (err) {
DRM_ERROR("device add failed: %d\n", err);
goto err_out;
}
for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
err = device_create_file(&minor->kdev, &device_attrs[i]);
if (err)
goto err_out_files;
}
return 0;
err_out_files:
if (i > 0)
for (j = 0; j < i; j++)
device_remove_file(&minor->kdev, &device_attrs[i]);
device_unregister(&minor->kdev);
err_out:
return err;
}
/**
* drm_sysfs_device_remove - remove DRM device
* @dev: DRM device to remove
*
* This call unregisters and cleans up a class device that was created with a
* call to drm_sysfs_device_add()
*/
void drm_sysfs_device_remove(struct drm_minor *minor)
{
int i;
for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
device_remove_file(&minor->kdev, &device_attrs[i]);
device_unregister(&minor->kdev);
}
|
