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/* $Id: tree.c,v 1.1 2005-12-20 09:49:32 jcastillo Exp $

 * tree.c: Basic device tree traversal/scanning for the Linux

 *         prom library.

 *

 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)

 */

#include <linux/config.h>

#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 CONFIG_AP1000

        printk("prom_getchild -> 0\n");

        return 0;

#endif

        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 CONFIG_AP1000

        printk("prom_getsibling -> 0\n");

        return 0;

#endif

        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 CONFIG_AP1000

        printk("prom_getproplen(%s) -> -1\n",prop);

        return -1;

#endif

        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;

#if CONFIG_AP1000

        printk("prom_getproperty(%s) -> -1\n",prop);

        return -1;

#endif

        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 its value.  Returns -1

 * on failure.

 */

int

prom_getint(int node, char *prop)

{

        static int intprop;

#if CONFIG_AP1000

        printk("prom_getint(%s) -> -1\n",prop);

        return -1;

#endif

        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;

#if CONFIG_AP1000

        printk("prom_getintdefault(%s) -> 0\n",property);

        return 0;

#endif

        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;

#if CONFIG_AP1000

        printk("prom_getbool(%s) -> 0\n",prop);

        return 0;

#endif

        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;

#if CONFIG_AP1000

        printk("prom_getstring(%s) -> .\n",prop);

        return;

#endif

        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);

}

int

prom_node_has_property(int node, char *prop)

{

        char *current_property = "";

        do {

                current_property = prom_nextprop(node, current_property);

                if(!strcmp(current_property, prop))

                   return 1;

        } while (*current_property);

        return 0;

}

/* 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);

}