Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * proc_devtree.c - handles /proc/device-tree |
| 3 | * |
| 4 | * Copyright 1997 Paul Mackerras |
| 5 | */ |
| 6 | #include <linux/errno.h> |
Alexey Dobriyan | 1e0edd3 | 2008-10-17 05:07:44 +0400 | [diff] [blame] | 7 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include <linux/time.h> |
| 9 | #include <linux/proc_fs.h> |
Alexey Dobriyan | e22f628 | 2009-09-06 23:31:25 +0000 | [diff] [blame] | 10 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/stat.h> |
| 12 | #include <linux/string.h> |
Jeremy Kerr | 50ab2fe | 2010-02-01 21:34:14 -0700 | [diff] [blame] | 13 | #include <linux/of.h> |
Jeremy Kerr | 7c540d9 | 2010-02-14 07:13:41 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <asm/prom.h> |
| 16 | #include <asm/uaccess.h> |
Al Viro | 3174c21 | 2009-04-07 13:19:18 -0400 | [diff] [blame] | 17 | #include "internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
Benjamin Herrenschmidt | 5f64f73 | 2005-06-01 17:07:27 +1000 | [diff] [blame] | 19 | static inline void set_node_proc_entry(struct device_node *np, |
| 20 | struct proc_dir_entry *de) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | { |
Jeremy Kerr | 8cfb334 | 2010-02-01 21:34:14 -0700 | [diff] [blame] | 22 | #ifdef HAVE_ARCH_DEVTREE_FIXUPS |
| 23 | np->pde = de; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #endif |
Jeremy Kerr | 8cfb334 | 2010-02-01 21:34:14 -0700 | [diff] [blame] | 25 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | static struct proc_dir_entry *proc_device_tree; |
| 28 | |
| 29 | /* |
| 30 | * Supply data on a read from /proc/device-tree/node/property. |
| 31 | */ |
Alexey Dobriyan | e22f628 | 2009-09-06 23:31:25 +0000 | [diff] [blame] | 32 | static int property_proc_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | { |
Alexey Dobriyan | e22f628 | 2009-09-06 23:31:25 +0000 | [diff] [blame] | 34 | struct property *pp = m->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Alexey Dobriyan | e22f628 | 2009-09-06 23:31:25 +0000 | [diff] [blame] | 36 | seq_write(m, pp->value, pp->length); |
| 37 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | } |
| 39 | |
Alexey Dobriyan | e22f628 | 2009-09-06 23:31:25 +0000 | [diff] [blame] | 40 | static int property_proc_open(struct inode *inode, struct file *file) |
| 41 | { |
| 42 | return single_open(file, property_proc_show, PDE(inode)->data); |
| 43 | } |
| 44 | |
| 45 | static const struct file_operations property_proc_fops = { |
| 46 | .owner = THIS_MODULE, |
| 47 | .open = property_proc_open, |
| 48 | .read = seq_read, |
| 49 | .llseek = seq_lseek, |
| 50 | .release = single_release, |
| 51 | }; |
| 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | /* |
| 54 | * For a node with a name like "gc@10", we make symlinks called "gc" |
| 55 | * and "@10" to it. |
| 56 | */ |
| 57 | |
| 58 | /* |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 59 | * Add a property to a node |
| 60 | */ |
| 61 | static struct proc_dir_entry * |
Michael Ellerman | 5149fa4 | 2006-03-27 14:26:26 +1100 | [diff] [blame] | 62 | __proc_device_tree_add_prop(struct proc_dir_entry *de, struct property *pp, |
| 63 | const char *name) |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 64 | { |
| 65 | struct proc_dir_entry *ent; |
| 66 | |
| 67 | /* |
| 68 | * Unfortunately proc_register puts each new entry |
| 69 | * at the beginning of the list. So we rearrange them. |
| 70 | */ |
Alexey Dobriyan | e22f628 | 2009-09-06 23:31:25 +0000 | [diff] [blame] | 71 | ent = proc_create_data(name, |
| 72 | strncmp(name, "security-", 9) ? S_IRUGO : S_IRUSR, |
| 73 | de, &property_proc_fops, pp); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 74 | if (ent == NULL) |
| 75 | return NULL; |
| 76 | |
Michael Ellerman | 5149fa4 | 2006-03-27 14:26:26 +1100 | [diff] [blame] | 77 | if (!strncmp(name, "security-", 9)) |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 78 | ent->size = 0; /* don't leak number of password chars */ |
| 79 | else |
| 80 | ent->size = pp->length; |
| 81 | |
| 82 | return ent; |
| 83 | } |
| 84 | |
| 85 | |
| 86 | void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop) |
| 87 | { |
Michael Ellerman | 5149fa4 | 2006-03-27 14:26:26 +1100 | [diff] [blame] | 88 | __proc_device_tree_add_prop(pde, prop, prop->name); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 89 | } |
| 90 | |
Dave C Boutcher | 898b539 | 2006-01-12 16:07:17 -0600 | [diff] [blame] | 91 | void proc_device_tree_remove_prop(struct proc_dir_entry *pde, |
| 92 | struct property *prop) |
| 93 | { |
| 94 | remove_proc_entry(prop->name, pde); |
| 95 | } |
| 96 | |
| 97 | void proc_device_tree_update_prop(struct proc_dir_entry *pde, |
| 98 | struct property *newprop, |
| 99 | struct property *oldprop) |
| 100 | { |
| 101 | struct proc_dir_entry *ent; |
| 102 | |
| 103 | for (ent = pde->subdir; ent != NULL; ent = ent->next) |
| 104 | if (ent->data == oldprop) |
| 105 | break; |
| 106 | if (ent == NULL) { |
| 107 | printk(KERN_WARNING "device-tree: property \"%s\" " |
| 108 | " does not exist\n", oldprop->name); |
| 109 | } else { |
| 110 | ent->data = newprop; |
| 111 | ent->size = newprop->length; |
| 112 | } |
| 113 | } |
| 114 | |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 115 | /* |
Michael Ellerman | 5149fa4 | 2006-03-27 14:26:26 +1100 | [diff] [blame] | 116 | * Various dodgy firmware might give us nodes and/or properties with |
| 117 | * conflicting names. That's generally ok, except for exporting via /proc, |
| 118 | * so munge names here to ensure they're unique. |
| 119 | */ |
| 120 | |
| 121 | static int duplicate_name(struct proc_dir_entry *de, const char *name) |
| 122 | { |
| 123 | struct proc_dir_entry *ent; |
| 124 | int found = 0; |
| 125 | |
| 126 | spin_lock(&proc_subdir_lock); |
| 127 | |
| 128 | for (ent = de->subdir; ent != NULL; ent = ent->next) { |
| 129 | if (strcmp(ent->name, name) == 0) { |
| 130 | found = 1; |
| 131 | break; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | spin_unlock(&proc_subdir_lock); |
| 136 | |
| 137 | return found; |
| 138 | } |
| 139 | |
| 140 | static const char *fixup_name(struct device_node *np, struct proc_dir_entry *de, |
| 141 | const char *name) |
| 142 | { |
| 143 | char *fixed_name; |
| 144 | int fixup_len = strlen(name) + 2 + 1; /* name + #x + \0 */ |
| 145 | int i = 1, size; |
| 146 | |
| 147 | realloc: |
| 148 | fixed_name = kmalloc(fixup_len, GFP_KERNEL); |
| 149 | if (fixed_name == NULL) { |
| 150 | printk(KERN_ERR "device-tree: Out of memory trying to fixup " |
| 151 | "name \"%s\"\n", name); |
| 152 | return name; |
| 153 | } |
| 154 | |
| 155 | retry: |
| 156 | size = snprintf(fixed_name, fixup_len, "%s#%d", name, i); |
| 157 | size++; /* account for NULL */ |
| 158 | |
| 159 | if (size > fixup_len) { |
| 160 | /* We ran out of space, free and reallocate. */ |
| 161 | kfree(fixed_name); |
| 162 | fixup_len = size; |
| 163 | goto realloc; |
| 164 | } |
| 165 | |
| 166 | if (duplicate_name(de, fixed_name)) { |
| 167 | /* Multiple duplicates. Retry with a different offset. */ |
| 168 | i++; |
| 169 | goto retry; |
| 170 | } |
| 171 | |
| 172 | printk(KERN_WARNING "device-tree: Duplicate name in %s, " |
| 173 | "renamed to \"%s\"\n", np->full_name, fixed_name); |
| 174 | |
| 175 | return fixed_name; |
| 176 | } |
| 177 | |
| 178 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | * Process a node, adding entries for its children and its properties. |
| 180 | */ |
Benjamin Herrenschmidt | 5f64f73 | 2005-06-01 17:07:27 +1000 | [diff] [blame] | 181 | void proc_device_tree_add_node(struct device_node *np, |
| 182 | struct proc_dir_entry *de) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | { |
| 184 | struct property *pp; |
| 185 | struct proc_dir_entry *ent; |
Benjamin Herrenschmidt | 5f64f73 | 2005-06-01 17:07:27 +1000 | [diff] [blame] | 186 | struct device_node *child; |
Benjamin Herrenschmidt | 5f64f73 | 2005-06-01 17:07:27 +1000 | [diff] [blame] | 187 | const char *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
| 189 | set_node_proc_entry(np, de); |
Benjamin Herrenschmidt | 5f64f73 | 2005-06-01 17:07:27 +1000 | [diff] [blame] | 190 | for (child = NULL; (child = of_get_next_child(np, child));) { |
Michael Ellerman | 5149fa4 | 2006-03-27 14:26:26 +1100 | [diff] [blame] | 191 | /* Use everything after the last slash, or the full name */ |
Benjamin Herrenschmidt | 5f64f73 | 2005-06-01 17:07:27 +1000 | [diff] [blame] | 192 | p = strrchr(child->full_name, '/'); |
| 193 | if (!p) |
| 194 | p = child->full_name; |
| 195 | else |
| 196 | ++p; |
Michael Ellerman | 5149fa4 | 2006-03-27 14:26:26 +1100 | [diff] [blame] | 197 | |
| 198 | if (duplicate_name(de, p)) |
| 199 | p = fixup_name(np, de, p); |
| 200 | |
Benjamin Herrenschmidt | 5f64f73 | 2005-06-01 17:07:27 +1000 | [diff] [blame] | 201 | ent = proc_mkdir(p, de); |
Michal Simek | bcac2b1 | 2009-06-17 16:25:59 -0700 | [diff] [blame] | 202 | if (ent == NULL) |
Benjamin Herrenschmidt | 5f64f73 | 2005-06-01 17:07:27 +1000 | [diff] [blame] | 203 | break; |
Benjamin Herrenschmidt | 5f64f73 | 2005-06-01 17:07:27 +1000 | [diff] [blame] | 204 | proc_device_tree_add_node(child, ent); |
| 205 | } |
| 206 | of_node_put(child); |
Benjamin Herrenschmidt | 5f64f73 | 2005-06-01 17:07:27 +1000 | [diff] [blame] | 207 | |
Michal Simek | bcac2b1 | 2009-06-17 16:25:59 -0700 | [diff] [blame] | 208 | for (pp = np->properties; pp != NULL; pp = pp->next) { |
Michael Ellerman | 5149fa4 | 2006-03-27 14:26:26 +1100 | [diff] [blame] | 209 | p = pp->name; |
| 210 | |
| 211 | if (duplicate_name(de, p)) |
| 212 | p = fixup_name(np, de, p); |
| 213 | |
| 214 | ent = __proc_device_tree_add_prop(de, pp, p); |
Michal Simek | bcac2b1 | 2009-06-17 16:25:59 -0700 | [diff] [blame] | 215 | if (ent == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | /* |
| 221 | * Called on initialization to set up the /proc/device-tree subtree |
| 222 | */ |
Alexey Dobriyan | 1e0edd3 | 2008-10-17 05:07:44 +0400 | [diff] [blame] | 223 | void __init proc_device_tree_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | { |
| 225 | struct device_node *root; |
Anton Vorontsov | 6b82b3e | 2008-12-09 09:47:29 +0000 | [diff] [blame] | 226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | proc_device_tree = proc_mkdir("device-tree", NULL); |
Michal Simek | bcac2b1 | 2009-06-17 16:25:59 -0700 | [diff] [blame] | 228 | if (proc_device_tree == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | return; |
| 230 | root = of_find_node_by_path("/"); |
Michal Simek | bcac2b1 | 2009-06-17 16:25:59 -0700 | [diff] [blame] | 231 | if (root == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | printk(KERN_ERR "/proc/device-tree: can't find root\n"); |
| 233 | return; |
| 234 | } |
| 235 | proc_device_tree_add_node(root, proc_device_tree); |
| 236 | of_node_put(root); |
| 237 | } |