1 /* $Id: tree.c,v 1.10 1998/01/10 22:39:00 ecd Exp $
2 * tree.c: Basic device tree traversal/scanning for the Linux
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 #include <linux/string.h>
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
14 #include <asm/openprom.h>
15 #include <asm/oplib.h>
17 /* Return the child of node 'node' or zero if no this node has no
21 __prom_getchild(int node)
23 return p1275_cmd ("child", P1275_INOUT(1, 1), node);
27 prom_getchild(int node)
31 if(node == -1) return 0;
32 cnode = __prom_getchild(node);
33 if(cnode == -1) return 0;
38 prom_getparent(int node)
42 if(node == -1) return 0;
43 cnode = p1275_cmd ("parent", P1275_INOUT(1, 1), node);
44 if(cnode == -1) return 0;
48 /* Return the next sibling of node 'node' or zero if no more siblings
49 * at this level of depth in the tree.
52 __prom_getsibling(int node)
54 return p1275_cmd(prom_peer_name, P1275_INOUT(1, 1), node);
58 prom_getsibling(int node)
64 sibnode = __prom_getsibling(node);
71 /* Return the length in bytes of property 'prop' at node 'node'.
75 prom_getproplen(int node, const char *prop)
77 if((!node) || (!prop)) return -1;
78 return p1275_cmd ("getproplen",
79 P1275_ARG(1,P1275_ARG_IN_STRING)|
84 /* Acquire a property 'prop' at node 'node' and place it in
85 * 'buffer' which has a size of 'bufsize'. If the acquisition
86 * was successful the length will be returned, else -1 is returned.
89 prom_getproperty(int node, const char *prop, char *buffer, int bufsize)
93 plen = prom_getproplen(node, prop);
94 if ((plen > bufsize) || (plen == 0) || (plen == -1)) {
97 /* Ok, things seem all right. */
98 return p1275_cmd(prom_getprop_name,
99 P1275_ARG(1,P1275_ARG_IN_STRING)|
100 P1275_ARG(2,P1275_ARG_OUT_BUF)|
102 node, prop, buffer, P1275_SIZE(plen));
106 /* Acquire an integer property and return its value. Returns -1
110 prom_getint(int node, const char *prop)
114 if(prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1)
120 /* Acquire an integer property, upon error return the passed default
125 prom_getintdefault(int node, const char *property, int deflt)
129 retval = prom_getint(node, property);
130 if(retval == -1) return deflt;
135 /* Acquire a boolean property, 1=TRUE 0=FALSE. */
137 prom_getbool(int node, const char *prop)
141 retval = prom_getproplen(node, prop);
142 if(retval == -1) return 0;
146 /* Acquire a property whose value is a string, returns a null
147 * string on error. The char pointer is the user supplied string
151 prom_getstring(int node, const char *prop, char *user_buf, int ubuf_size)
155 len = prom_getproperty(node, prop, user_buf, ubuf_size);
156 if(len != -1) return;
162 /* Does the device at node 'node' have name 'name'?
166 prom_nodematch(int node, const char *name)
169 prom_getproperty(node, "name", namebuf, sizeof(namebuf));
170 if(strcmp(namebuf, name) == 0) return 1;
174 /* Search siblings at 'node_start' for a node with name
175 * 'nodename'. Return node if successful, zero if not.
178 prom_searchsiblings(int node_start, const char *nodename)
182 char promlib_buf[128];
184 for(thisnode = node_start; thisnode;
185 thisnode=prom_getsibling(thisnode)) {
186 error = prom_getproperty(thisnode, "name", promlib_buf,
187 sizeof(promlib_buf));
188 /* Should this ever happen? */
189 if(error == -1) continue;
190 if(strcmp(nodename, promlib_buf)==0) return thisnode;
196 /* Return the first property type for node 'node'.
197 * buffer should be at least 32B in length
200 prom_firstprop(int node, char *buffer)
203 if(node == -1) return buffer;
204 p1275_cmd ("nextprop", P1275_ARG(2,P1275_ARG_OUT_32B)|
206 node, (char *) 0x0, buffer);
210 /* Return the property type string after property type 'oprop'
211 * at node 'node' . Returns NULL string if no more
212 * property types for this node.
215 prom_nextprop(int node, const char *oprop, char *buffer)
223 if (oprop == buffer) {
227 p1275_cmd ("nextprop", P1275_ARG(1,P1275_ARG_IN_STRING)|
228 P1275_ARG(2,P1275_ARG_OUT_32B)|
230 node, oprop, buffer);
235 prom_finddevice(const char *name)
239 return p1275_cmd(prom_finddev_name,
240 P1275_ARG(0,P1275_ARG_IN_STRING)|
245 int prom_node_has_property(int node, const char *prop)
251 prom_nextprop(node, buf, buf);
252 if(!strcmp(buf, prop))
258 /* Set property 'pname' at node 'node' to value 'value' which has a length
259 * of 'size' bytes. Return the number of bytes the prom accepted.
262 prom_setprop(int node, const char *pname, char *value, int size)
264 if(size == 0) return 0;
265 if((pname == 0) || (value == 0)) return 0;
267 return p1275_cmd ("setprop", P1275_ARG(1,P1275_ARG_IN_STRING)|
268 P1275_ARG(2,P1275_ARG_IN_BUF)|
270 node, pname, value, P1275_SIZE(size));
274 prom_inst2pkg(int inst)
278 node = p1275_cmd ("instance-to-package", P1275_INOUT(1, 1), inst);
279 if (node == -1) return 0;
283 /* Return 'node' assigned to a particular prom 'path'
284 * FIXME: Should work for v0 as well
287 prom_pathtoinode(const char *path)
291 inst = prom_devopen (path);
292 if (inst == 0) return 0;
293 node = prom_inst2pkg (inst);
294 prom_devclose (inst);
295 if (node == -1) return 0;