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
|
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <asm/errno.h>
#include <asm/of_device.h>
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->node->name, ofdev->node->type);
/* Get compatible property if any */
compat = of_get_property(ofdev->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;
}
int of_device_uevent(struct device *dev,
char **envp, int num_envp, char *buffer, int buffer_size)
{
struct of_device *ofdev;
const char *compat;
int i = 0, length = 0, seen = 0, cplen, sl;
if (!dev)
return -ENODEV;
ofdev = to_of_device(dev);
if (add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"OF_NAME=%s", ofdev->node->name))
return -ENOMEM;
if (add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"OF_TYPE=%s", ofdev->node->type))
return -ENOMEM;
/* Since the compatible field can contain pretty much anything
* it's not really legal to split it out with commas. We split it
* up using a number of environment variables instead. */
compat = of_get_property(ofdev->node, "compatible", &cplen);
while (compat && *compat && cplen > 0) {
if (add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"OF_COMPATIBLE_%d=%s", seen, compat))
return -ENOMEM;
sl = strlen (compat) + 1;
compat += sl;
cplen -= sl;
seen++;
}
if (add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"OF_COMPATIBLE_N=%d", seen))
return -ENOMEM;
/* modalias is trickier, we add it in 2 steps */
if (add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"MODALIAS="))
return -ENOMEM;
sl = of_device_get_modalias(ofdev, &buffer[length-1],
buffer_size-length);
if (sl >= (buffer_size-length))
return -ENOMEM;
length += sl;
envp[i] = NULL;
return 0;
}
EXPORT_SYMBOL(of_device_uevent);
EXPORT_SYMBOL(of_device_get_modalias);
|
