patch-1.3.4 linux/arch/sparc/prom/tree.c

• Lines: 186
• Date: Wed Jun 7 12:21:08 1995
• Orig file: v1.3.3/linux/arch/sparc/prom/tree.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.3/linux/arch/sparc/prom/tree.c linux/arch/sparc/prom/tree.c
@@ -0,0 +1,185 @@
+/* tree.c: Basic device tree traversal/scanning for the Linux
+ *         prom library.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <linux/string.h>
+
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+
+static char promlib_buf[128];
+
+/* Return the child of node 'node' or zero if no this node has no
+ * direct descendent.
+ */
+int
+prom_getchild(int node)
+{
+	int cnode;
+
+	if(node == -1) return 0;
+	cnode = prom_nodeops->no_child(node);
+	if((cnode == 0) || (cnode == -1)) return 0;
+	return cnode;
+}
+
+/* Return the next sibling of node 'node' or zero if no more siblings
+ * at this level of depth in the tree.
+ */
+int
+prom_getsibling(int node)
+{
+	int sibnode;
+
+	if(node == -1) return 0;
+	sibnode = prom_nodeops->no_nextnode(node);
+	if((sibnode == 0) || (sibnode == -1)) return 0;
+	return sibnode;
+}
+
+/* Return the length in bytes of property 'prop' at node 'node'.
+ * Return -1 on error.
+ */
+int
+prom_getproplen(int node, char *prop)
+{
+	if((!node) || (!prop)) return -1;
+	return prom_nodeops->no_proplen(node, prop);
+}
+
+/* Acquire a property 'prop' at node 'node' and place it in
+ * 'buffer' which has a size of 'bufsize'.  If the acquisition
+ * was successful the length will be returned, else -1 is returned.
+ */
+int
+prom_getproperty(int node, char *prop, char *buffer, int bufsize)
+{
+	int plen;
+
+	plen = prom_getproplen(node, prop);
+	if((plen > bufsize) || (plen == 0) || (plen == -1)) return -1;
+
+	/* Ok, things seem all right. */
+	return prom_nodeops->no_getprop(node, prop, buffer);
+}
+
+/* Acquire an integer property and return it's value.  Returns -1
+ * on failure.
+ */
+int
+prom_getint(int node, char *prop)
+{
+	static int intprop;
+
+	if(prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1)
+		return intprop;
+
+	return -1;
+}
+
+/* Acquire an integer property, upon error return the passed default
+ * integer.
+ */
+
+int
+prom_getintdefault(int node, char *property, int deflt)
+{
+	int retval;
+
+	retval = prom_getint(node, property);
+	if(retval == -1) return deflt;
+
+	return retval;
+}
+
+/* Acquire a boolean property, 1=TRUE 0=FALSE. */
+int
+prom_getbool(int node, char *prop)
+{
+	int retval;
+
+	retval = prom_getproplen(node, prop);
+	if(retval == -1) return 0;
+	return 1;
+}
+
+/* Acquire a property whose value is a string, returns a null
+ * string on error.  The char pointer is the user supplied string
+ * buffer.
+ */
+void
+prom_getstring(int node, char *prop, char *user_buf, int ubuf_size)
+{
+	int len;
+
+	len = prom_getproperty(node, prop, user_buf, ubuf_size);
+	if(len != -1) return;
+	user_buf[0] = 0;
+	return;
+}
+
+
+/* Does the device at node 'node' have name 'name'?
+ * YES = 1   NO = 0
+ */
+int
+prom_nodematch(int node, char *name)
+{
+	static char namebuf[128];
+	prom_getproperty(node, "name", namebuf, sizeof(namebuf));
+	if(strcmp(namebuf, name) == 0) return 1;
+	return 0;
+}
+
+/* Search siblings at 'node_start' for a node with name
+ * 'nodename'.  Return node if successful, zero if not.
+ */
+int
+prom_searchsiblings(int node_start, char *nodename)
+{
+	int thisnode, error;
+
+	for(thisnode = node_start; thisnode;
+	    thisnode=prom_getsibling(thisnode)) {
+		error = prom_getproperty(thisnode, "name", promlib_buf,
+					 sizeof(promlib_buf));
+		/* Should this ever happen? */
+		if(error == -1) continue;
+		if(strcmp(nodename, promlib_buf)==0) return thisnode;
+	}
+
+	return 0;
+}
+
+/* Return the first property type for node 'node'.
+ */
+char *
+prom_firstprop(int node)
+{
+	if(node == -1) return "";
+	return prom_nodeops->no_nextprop(node, (char *) 0x0);
+}
+
+/* Return the property type string after property type 'oprop'
+ * at node 'node' .  Returns NULL string if no more
+ * property types for this node.
+ */
+char *
+prom_nextprop(int node, char *oprop)
+{
+	if(node == -1) return "";
+	return prom_nodeops->no_nextprop(node, oprop);
+}
+
+/* Set property 'pname' at node 'node' to value 'value' which has a length
+ * of 'size' bytes.  Return the number of bytes the prom accepted.
+ */
+int
+prom_setprop(int node, char *pname, char *value, int size)
+{
+	if(size == 0) return 0;
+	if((pname == 0) || (value == 0)) return 0;
+	return prom_nodeops->no_setprop(node, pname, value, size);
+}