1 files changed, 241 insertions, 0 deletions
diff --git a/ANDROID_3.4.5/fs/proc/proc_devtree.c b/ANDROID_3.4.5/fs/proc/proc_devtree.c
new file mode 100644
index 00000000..927cbd11
--- /dev/null
+++ b/ANDROID_3.4.5/fs/proc/proc_devtree.c
@@ -0,0 +1,241 @@
+/*
+ * proc_devtree.c - handles /proc/device-tree
+ *
+ * Copyright 1997 Paul Mackerras
+ */
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <asm/prom.h>
+#include <asm/uaccess.h>
+#include "internal.h"
+
+static inline void set_node_proc_entry(struct device_node *np,
+				       struct proc_dir_entry *de)
+{
+#ifdef HAVE_ARCH_DEVTREE_FIXUPS
+	np->pde = de;
+#endif
+}
+
+static struct proc_dir_entry *proc_device_tree;
+
+/*
+ * Supply data on a read from /proc/device-tree/node/property.
+ */
+static int property_proc_show(struct seq_file *m, void *v)
+{
+	struct property *pp = m->private;
+
+	seq_write(m, pp->value, pp->length);
+	return 0;
+}
+
+static int property_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, property_proc_show, PDE(inode)->data);
+}
+
+static const struct file_operations property_proc_fops = {
+	.owner		= THIS_MODULE,
+	.open		= property_proc_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+/*
+ * For a node with a name like "gc@10", we make symlinks called "gc"
+ * and "@10" to it.
+ */
+
+/*
+ * Add a property to a node
+ */
+static struct proc_dir_entry *
+__proc_device_tree_add_prop(struct proc_dir_entry *de, struct property *pp,
+		const char *name)
+{
+	struct proc_dir_entry *ent;
+
+	/*
+	 * Unfortunately proc_register puts each new entry
+	 * at the beginning of the list.  So we rearrange them.
+	 */
+	ent = proc_create_data(name,
+			       strncmp(name, "security-", 9) ? S_IRUGO : S_IRUSR,
+			       de, &property_proc_fops, pp);
+	if (ent == NULL)
+		return NULL;
+
+	if (!strncmp(name, "security-", 9))
+		ent->size = 0; /* don't leak number of password chars */
+	else
+		ent->size = pp->length;
+
+	return ent;
+}
+
+
+void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop)
+{
+	__proc_device_tree_add_prop(pde, prop, prop->name);
+}
+
+void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
+				  struct property *prop)
+{
+	remove_proc_entry(prop->name, pde);
+}
+
+void proc_device_tree_update_prop(struct proc_dir_entry *pde,
+				  struct property *newprop,
+				  struct property *oldprop)
+{
+	struct proc_dir_entry *ent;
+
+	for (ent = pde->subdir; ent != NULL; ent = ent->next)
+		if (ent->data == oldprop)
+			break;
+	if (ent == NULL) {
+		printk(KERN_WARNING "device-tree: property \"%s\" "
+		       " does not exist\n", oldprop->name);
+	} else {
+		ent->data = newprop;
+		ent->size = newprop->length;
+	}
+}
+
+/*
+ * Various dodgy firmware might give us nodes and/or properties with
+ * conflicting names. That's generally ok, except for exporting via /proc,
+ * so munge names here to ensure they're unique.
+ */
+
+static int duplicate_name(struct proc_dir_entry *de, const char *name)
+{
+	struct proc_dir_entry *ent;
+	int found = 0;
+
+	spin_lock(&proc_subdir_lock);
+
+	for (ent = de->subdir; ent != NULL; ent = ent->next) {
+		if (strcmp(ent->name, name) == 0) {
+			found = 1;
+			break;
+		}
+	}
+
+	spin_unlock(&proc_subdir_lock);
+
+	return found;
+}
+
+static const char *fixup_name(struct device_node *np, struct proc_dir_entry *de,
+		const char *name)
+{
+	char *fixed_name;
+	int fixup_len = strlen(name) + 2 + 1; /* name + #x + \0 */
+	int i = 1, size;
+
+realloc:
+	fixed_name = kmalloc(fixup_len, GFP_KERNEL);
+	if (fixed_name == NULL) {
+		printk(KERN_ERR "device-tree: Out of memory trying to fixup "
+				"name \"%s\"\n", name);
+		return name;
+	}
+
+retry:
+	size = snprintf(fixed_name, fixup_len, "%s#%d", name, i);
+	size++; /* account for NULL */
+
+	if (size > fixup_len) {
+		/* We ran out of space, free and reallocate. */
+		kfree(fixed_name);
+		fixup_len = size;
+		goto realloc;
+	}
+
+	if (duplicate_name(de, fixed_name)) {
+		/* Multiple duplicates. Retry with a different offset. */
+		i++;
+		goto retry;
+	}
+
+	printk(KERN_WARNING "device-tree: Duplicate name in %s, "
+			"renamed to \"%s\"\n", np->full_name, fixed_name);
+
+	return fixed_name;
+}
+
+/*
+ * Process a node, adding entries for its children and its properties.
+ */
+void proc_device_tree_add_node(struct device_node *np,
+			       struct proc_dir_entry *de)
+{
+	struct property *pp;
+	struct proc_dir_entry *ent;
+	struct device_node *child;
+	const char *p;
+
+	set_node_proc_entry(np, de);
+	for (child = NULL; (child = of_get_next_child(np, child));) {
+		/* Use everything after the last slash, or the full name */
+		p = strrchr(child->full_name, '/');
+		if (!p)
+			p = child->full_name;
+		else
+			++p;
+
+		if (duplicate_name(de, p))
+			p = fixup_name(np, de, p);
+
+		ent = proc_mkdir(p, de);
+		if (ent == NULL)
+			break;
+		proc_device_tree_add_node(child, ent);
+	}
+	of_node_put(child);
+
+	for (pp = np->properties; pp != NULL; pp = pp->next) {
+		p = pp->name;
+
+		if (strchr(p, '/'))
+			continue;
+
+		if (duplicate_name(de, p))
+			p = fixup_name(np, de, p);
+
+		ent = __proc_device_tree_add_prop(de, pp, p);
+		if (ent == NULL)
+			break;
+	}
+}
+
+/*
+ * Called on initialization to set up the /proc/device-tree subtree
+ */
+void __init proc_device_tree_init(void)
+{
+	struct device_node *root;
+
+	proc_device_tree = proc_mkdir("device-tree", NULL);
+	if (proc_device_tree == NULL)
+		return;
+	root = of_find_node_by_path("/");
+	if (root == NULL) {
+		pr_debug("/proc/device-tree: can't find root\n");
+		return;
+	}
+	proc_device_tree_add_node(root, proc_device_tree);
+	of_node_put(root);
+}