Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[deliverable/linux.git] / arch / powerpc / kernel / of_device.c
1 #include <linux/string.h>
2 #include <linux/kernel.h>
3 #include <linux/of.h>
4 #include <linux/init.h>
5 #include <linux/module.h>
6 #include <linux/mod_devicetable.h>
7 #include <linux/slab.h>
8
9 #include <asm/errno.h>
10 #include <asm/of_device.h>
11
12 ssize_t of_device_get_modalias(struct of_device *ofdev,
13 char *str, ssize_t len)
14 {
15 const char *compat;
16 int cplen, i;
17 ssize_t tsize, csize, repend;
18
19 /* Name & Type */
20 csize = snprintf(str, len, "of:N%sT%s",
21 ofdev->node->name, ofdev->node->type);
22
23 /* Get compatible property if any */
24 compat = of_get_property(ofdev->node, "compatible", &cplen);
25 if (!compat)
26 return csize;
27
28 /* Find true end (we tolerate multiple \0 at the end */
29 for (i=(cplen-1); i>=0 && !compat[i]; i--)
30 cplen--;
31 if (!cplen)
32 return csize;
33 cplen++;
34
35 /* Check space (need cplen+1 chars including final \0) */
36 tsize = csize + cplen;
37 repend = tsize;
38
39 if (csize>=len) /* @ the limit, all is already filled */
40 return tsize;
41
42 if (tsize>=len) { /* limit compat list */
43 cplen = len-csize-1;
44 repend = len;
45 }
46
47 /* Copy and do char replacement */
48 memcpy(&str[csize+1], compat, cplen);
49 for (i=csize; i<repend; i++) {
50 char c = str[i];
51 if (c=='\0')
52 str[i] = 'C';
53 else if (c==' ')
54 str[i] = '_';
55 }
56
57 return tsize;
58 }
59
60 int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
61 {
62 struct of_device *ofdev;
63 const char *compat;
64 int seen = 0, cplen, sl;
65
66 if (!dev)
67 return -ENODEV;
68
69 ofdev = to_of_device(dev);
70
71 if (add_uevent_var(env, "OF_NAME=%s", ofdev->node->name))
72 return -ENOMEM;
73
74 if (add_uevent_var(env, "OF_TYPE=%s", ofdev->node->type))
75 return -ENOMEM;
76
77 /* Since the compatible field can contain pretty much anything
78 * it's not really legal to split it out with commas. We split it
79 * up using a number of environment variables instead. */
80
81 compat = of_get_property(ofdev->node, "compatible", &cplen);
82 while (compat && *compat && cplen > 0) {
83 if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
84 return -ENOMEM;
85
86 sl = strlen (compat) + 1;
87 compat += sl;
88 cplen -= sl;
89 seen++;
90 }
91
92 if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
93 return -ENOMEM;
94
95 /* modalias is trickier, we add it in 2 steps */
96 if (add_uevent_var(env, "MODALIAS="))
97 return -ENOMEM;
98 sl = of_device_get_modalias(ofdev, &env->buf[env->buflen-1],
99 sizeof(env->buf) - env->buflen);
100 if (sl >= (sizeof(env->buf) - env->buflen))
101 return -ENOMEM;
102 env->buflen += sl;
103
104 return 0;
105 }
106 EXPORT_SYMBOL(of_device_uevent);
107 EXPORT_SYMBOL(of_device_get_modalias);
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