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
|
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <asm/errno.h>
/**
* of_match_device - Tell if a struct device matches an of_device_id list
* @ids: array of of device match structures to search in
* @dev: the of device structure to match against
*
* Used by a driver to check whether an of_device present in the
* system is in its list of supported devices.
*/
const struct of_device_id *of_match_device(const struct of_device_id *matches,
const struct device *dev)
{
if (!dev->of_node)
return NULL;
return of_match_node(matches, dev->of_node);
}
EXPORT_SYMBOL(of_match_device);
struct of_device *of_dev_get(struct of_device *dev)
{
struct device *tmp;
if (!dev)
return NULL;
tmp = get_device(&dev->dev);
if (tmp)
return to_of_device(tmp);
else
return NULL;
}
EXPORT_SYMBOL(of_dev_get);
void of_dev_put(struct of_device *dev)
{
if (dev)
put_device(&dev->dev);
}
EXPORT_SYMBOL(of_dev_put);
static ssize_t devspec_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct of_device *ofdev;
ofdev = to_of_device(dev);
return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name);
}
static ssize_t name_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct of_device *ofdev;
ofdev = to_of_device(dev);
return sprintf(buf, "%s\n", ofdev->dev.of_node->name);
}
static ssize_t modalias_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct of_device *ofdev = to_of_device(dev);
ssize_t len = 0;
len = of_device_get_modalias(ofdev, buf, PAGE_SIZE - 2);
buf[len] = '\n';
buf[len+1] = 0;
return len+1;
}
struct device_attribute of_platform_device_attrs[] = {
__ATTR_RO(devspec),
__ATTR_RO(name),
__ATTR_RO(modalias),
__ATTR_NULL
};
/**
* of_release_dev - free an of device structure when all users of it are finished.
* @dev: device that's been disconnected
*
* Will be called only by the device core when all users of this of device are
* done.
*/
void of_release_dev(struct device *dev)
{
struct of_device *ofdev;
ofdev = to_of_device(dev);
of_node_put(ofdev->dev.of_node);
kfree(ofdev);
}
EXPORT_SYMBOL(of_release_dev);
int of_device_register(struct of_device *ofdev)
{
BUG_ON(ofdev->dev.of_node == NULL);
device_initialize(&ofdev->dev);
/* device_add will assume that this device is on the same node as
* the parent. If there is no parent defined, set the node
* explicitly */
if (!ofdev->dev.parent)
set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
return device_add(&ofdev->dev);
}
EXPORT_SYMBOL(of_device_register);
void of_device_unregister(struct of_device *ofdev)
{
device_unregister(&ofdev->dev);
}
EXPORT_SYMBOL(of_device_unregister);
ssize_t of_device_get_modalias(struct of_device *ofdev,
char *str, ssize_t len)
{
const char *compat;
int cplen, i;
ssize_t tsize, csize, repend;
/* Name & Type */
csize = snprintf(str, len, "of:N%sT%s", ofdev->dev.of_node->name,
ofdev->dev.of_node->type);
/* Get compatible property if any */
compat = of_get_property(ofdev->dev.of_node, "compatible", &cplen);
if (!compat)
return csize;
/* Find true end (we tolerate multiple \0 at the end */
for (i = (cplen - 1); i >= 0 && !compat[i]; i--)
cplen--;
if (!cplen)
return csize;
cplen++;
/* Check space (need cplen+1 chars including final \0) */
tsize = csize + cplen;
repend = tsize;
if (csize >= len) /* @ the limit, all is already filled */
return tsize;
if (tsize >= len) { /* limit compat list */
cplen = len - csize - 1;
repend = len;
}
/* Copy and do char replacement */
memcpy(&str[csize + 1], compat, cplen);
for (i = csize; i < repend; i++) {
char c = str[i];
if (c == '\0')
str[i] = 'C';
else if (c == ' ')
str[i] = '_';
}
return tsize;
}
|
