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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * proc_devtree.c - handles /proc/device-tree | |
3 | * | |
4 | * Copyright 1997 Paul Mackerras | |
5 | */ | |
6 | #include <linux/errno.h> | |
7 | #include <linux/time.h> | |
8 | #include <linux/proc_fs.h> | |
9 | #include <linux/stat.h> | |
10 | #include <linux/string.h> | |
11 | #include <asm/prom.h> | |
12 | #include <asm/uaccess.h> | |
13 | ||
14 | #ifndef HAVE_ARCH_DEVTREE_FIXUPS | |
5f64f739 BH |
15 | static inline void set_node_proc_entry(struct device_node *np, |
16 | struct proc_dir_entry *de) | |
1da177e4 LT |
17 | { |
18 | } | |
19 | #endif | |
20 | ||
21 | static struct proc_dir_entry *proc_device_tree; | |
22 | ||
23 | /* | |
24 | * Supply data on a read from /proc/device-tree/node/property. | |
25 | */ | |
26 | static int property_read_proc(char *page, char **start, off_t off, | |
27 | int count, int *eof, void *data) | |
28 | { | |
29 | struct property *pp = data; | |
30 | int n; | |
31 | ||
32 | if (off >= pp->length) { | |
33 | *eof = 1; | |
34 | return 0; | |
35 | } | |
36 | n = pp->length - off; | |
37 | if (n > count) | |
38 | n = count; | |
39 | else | |
40 | *eof = 1; | |
41 | memcpy(page, pp->value + off, n); | |
42 | *start = page; | |
43 | return n; | |
44 | } | |
45 | ||
46 | /* | |
47 | * For a node with a name like "gc@10", we make symlinks called "gc" | |
48 | * and "@10" to it. | |
49 | */ | |
50 | ||
183d0202 BH |
51 | /* |
52 | * Add a property to a node | |
53 | */ | |
54 | static struct proc_dir_entry * | |
55 | __proc_device_tree_add_prop(struct proc_dir_entry *de, struct property *pp) | |
56 | { | |
57 | struct proc_dir_entry *ent; | |
58 | ||
59 | /* | |
60 | * Unfortunately proc_register puts each new entry | |
61 | * at the beginning of the list. So we rearrange them. | |
62 | */ | |
63 | ent = create_proc_read_entry(pp->name, | |
64 | strncmp(pp->name, "security-", 9) | |
65 | ? S_IRUGO : S_IRUSR, de, | |
66 | property_read_proc, pp); | |
67 | if (ent == NULL) | |
68 | return NULL; | |
69 | ||
70 | if (!strncmp(pp->name, "security-", 9)) | |
71 | ent->size = 0; /* don't leak number of password chars */ | |
72 | else | |
73 | ent->size = pp->length; | |
74 | ||
75 | return ent; | |
76 | } | |
77 | ||
78 | ||
79 | void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop) | |
80 | { | |
81 | __proc_device_tree_add_prop(pde, prop); | |
82 | } | |
83 | ||
1da177e4 LT |
84 | /* |
85 | * Process a node, adding entries for its children and its properties. | |
86 | */ | |
5f64f739 BH |
87 | void proc_device_tree_add_node(struct device_node *np, |
88 | struct proc_dir_entry *de) | |
1da177e4 LT |
89 | { |
90 | struct property *pp; | |
91 | struct proc_dir_entry *ent; | |
5f64f739 | 92 | struct device_node *child; |
5f64f739 | 93 | const char *p; |
1da177e4 LT |
94 | |
95 | set_node_proc_entry(np, de); | |
5f64f739 | 96 | for (child = NULL; (child = of_get_next_child(np, child));) { |
1da177e4 LT |
97 | p = strrchr(child->full_name, '/'); |
98 | if (!p) | |
99 | p = child->full_name; | |
100 | else | |
101 | ++p; | |
1da177e4 LT |
102 | ent = proc_mkdir(p, de); |
103 | if (ent == 0) | |
104 | break; | |
1da177e4 | 105 | proc_device_tree_add_node(child, ent); |
5f64f739 BH |
106 | } |
107 | of_node_put(child); | |
108 | for (pp = np->properties; pp != 0; pp = pp->next) { | |
1da177e4 | 109 | /* |
5f64f739 BH |
110 | * Yet another Apple device-tree bogosity: on some machines, |
111 | * they have properties & nodes with the same name. Those | |
112 | * properties are quite unimportant for us though, thus we | |
113 | * simply "skip" them here, but we do have to check. | |
1da177e4 | 114 | */ |
183d0202 | 115 | for (ent = de->subdir; ent != NULL; ent = ent->next) |
5f64f739 | 116 | if (!strcmp(ent->name, pp->name)) |
1da177e4 | 117 | break; |
5f64f739 BH |
118 | if (ent != NULL) { |
119 | printk(KERN_WARNING "device-tree: property \"%s\" name" | |
120 | " conflicts with node in %s\n", pp->name, | |
121 | np->full_name); | |
122 | continue; | |
1da177e4 | 123 | } |
5f64f739 | 124 | |
183d0202 | 125 | ent = __proc_device_tree_add_prop(de, pp); |
5f64f739 | 126 | if (ent == 0) |
1da177e4 | 127 | break; |
1da177e4 | 128 | } |
1da177e4 LT |
129 | } |
130 | ||
131 | /* | |
132 | * Called on initialization to set up the /proc/device-tree subtree | |
133 | */ | |
134 | void proc_device_tree_init(void) | |
135 | { | |
136 | struct device_node *root; | |
137 | if ( !have_of ) | |
138 | return; | |
139 | proc_device_tree = proc_mkdir("device-tree", NULL); | |
140 | if (proc_device_tree == 0) | |
141 | return; | |
142 | root = of_find_node_by_path("/"); | |
143 | if (root == 0) { | |
144 | printk(KERN_ERR "/proc/device-tree: can't find root\n"); | |
145 | return; | |
146 | } | |
147 | proc_device_tree_add_node(root, proc_device_tree); | |
148 | of_node_put(root); | |
149 | } |