/* $NetBSD: fdt_openfirm.c,v 1.2 2015/12/16 12:17:45 jmcneill Exp $ */

/*-
 * Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fdt_openfirm.c,v 1.2 2015/12/16 12:17:45 jmcneill Exp $");

#include <sys/param.h>

#include <libfdt.h>
#include <dev/fdt/fdtvar.h>

int
OF_peer(int phandle)
{
        const void *fdt_data = fdtbus_get_data();
        int off, depth;

        if (fdt_data == NULL) {
                return -1;
        }

        if (phandle == 0) {
                return fdtbus_offset2phandle(0);
        }

        off = fdtbus_phandle2offset(phandle);
        if (off < 0) {
                return 0;
        }

        depth = 1;
        for (off = fdt_next_node(fdt_data, off, &depth);
             off >= 0 && depth >= 0;
             off = fdt_next_node(fdt_data, off, &depth)) {
                if (depth == 1) {
                        return fdtbus_offset2phandle(off);
                }
        }

        return 0;
}

int
OF_child(int phandle)
{
        const void *fdt_data = fdtbus_get_data();
        int off, depth;

        if (fdt_data == NULL) {
                return -1;
        }

        off = fdtbus_phandle2offset(phandle);
        if (off < 0) {
                return 0;
        }

        depth = 0;
        for (off = fdt_next_node(fdt_data, off, &depth);
             off >= 0 && depth > 0;
             off = fdt_next_node(fdt_data, off, &depth)) {
                if (depth == 1) {
                        return fdtbus_offset2phandle(off);
                }
        }

        return 0;
}

int
OF_parent(int phandle)
{
        const void *fdt_data = fdtbus_get_data();
        int off;

        if (fdt_data == NULL) {
                return -1;
        }

        off = fdtbus_phandle2offset(phandle);
        if (off < 0) {
                return -1;
        }

        off = fdt_parent_offset(fdt_data, off);
        if (off < 0) {
                return -1;
        }

        return fdtbus_offset2phandle(off);
}

int
OF_nextprop(int phandle, const char *prop, void *nextprop)
{
        const void *fdt_data = fdtbus_get_data();
        const char *name;
        const void *val;
        int off, len;

        if (fdt_data == NULL) {
                return -1;
        }

        off = fdtbus_phandle2offset(phandle);
        if (off < 0) {
                return -1;
        }

        if (*prop == '\0') {
                name = "name";
        } else {
                off = fdt_first_property_offset(fdt_data, off);
                if (off < 0) {
                        return 0;
                }
                if (strcmp(prop, "name") != 0) {
                        while (off >= 0) {
                                val = fdt_getprop_by_offset(fdt_data, off,
                                    &name, &len);
                                if (val == NULL) {
                                        return -1;
                                }
                                off = fdt_next_property_offset(fdt_data, off);
                                if (off < 0) {
                                        return 0;
                                }
                                if (strcmp(name, prop) == 0)
                                        break;
                        }
                }
                val = fdt_getprop_by_offset(fdt_data, off, &name, &len);
                if (val == NULL) {
                        return -1;
                }
        }

        strlcpy(nextprop, name, 33);

        return 1;
}

int
OF_getprop(int phandle, const char *prop, void *buf, int buflen)
{
        const void *fdt_data = fdtbus_get_data();
        const char *name;
        const void *val;
        int off, len;

        if (fdt_data == NULL) {
                return -1;
        }

        off = fdtbus_phandle2offset(phandle);
        if (off < 0) {
                return -1;
        }

        if (strcmp(prop, "name") == 0) {
                val = fdt_get_name(fdt_data, off, &len);
                if (val) {
                        const char *p = strchr(val, '@');
                        if (p) {
                                len = (uintptr_t)p - (uintptr_t)val + 1;
                        } else {
                                len += 1;
                        }
                }
                if (val == NULL || len > buflen) {
                        return -1;
                }
                char *s = buf;
                memcpy(buf, val, len - 1);
                s[len - 1] = '\0';
        } else {
                off = fdt_first_property_offset(fdt_data, off);
                if (off < 0) {
                        return -1;
                }
                while (off >= 0) {
                        val = fdt_getprop_by_offset(fdt_data, off, &name, &len);
                        if (val == NULL) {
                                return -1;
                        }
                        if (strcmp(name, prop) == 0) {
                                break;
                        }
                        off = fdt_next_property_offset(fdt_data, off);
                        if (off < 0) {
                                return -1;
                        }
                }
                if (val == NULL || len > buflen) {
                        return -1;
                }
                memcpy(buf, val, len);
        }

        return len;
}

int
OF_getproplen(int phandle, const char *prop)
{
        const void *fdt_data = fdtbus_get_data();
        const char *name;
        const void *val;
        int off, len;

        if (fdt_data == NULL) {
                return -1;
        }

        off = fdtbus_phandle2offset(phandle);
        if (off < 0) {
                return -1;
        }

        if (strcmp(prop, "name") == 0) {
                val = fdt_get_name(fdt_data, off, &len);
                if (val) {
                        const char *p = strchr(val, '@');
                        if (p) {
                                len = (uintptr_t)p - (uintptr_t)val + 1;
                        } else {
                                len += 1;
                        }
                }
        } else {
                off = fdt_first_property_offset(fdt_data, off);
                if (off < 0) {
                        return -1;
                }
                while (off >= 0) {
                        val = fdt_getprop_by_offset(fdt_data, off, &name, &len);
                        if (val == NULL) {
                                return -1;
                        }
                        if (strcmp(name, prop) == 0) {
                                break;
                        }
                        off = fdt_next_property_offset(fdt_data, off);
                        if (off < 0) {
                                return -1;
                        }
                }
        }
        if (val == NULL) {
                return -1;
        }

        return len;
}

int
OF_setprop(int phandle, const char *prop, const void *buf, int buflen)
{
        return -1;
}

int
OF_finddevice(const char *name)
{
        const void *fdt_data = fdtbus_get_data();
        int off;

        if (fdt_data == NULL) {
                return -1;
        }

        off = fdt_path_offset(fdt_data, name);
        if (off < 0) {
                return -1;
        }

        return fdtbus_offset2phandle(off);
}

int
OF_package_to_path(int phandle, char *buf, int buflen)
{
        const void *fdt_data = fdtbus_get_data();
        int off;

        if (fdt_data == NULL) {
                return -1;
        }

        off = fdtbus_phandle2offset(phandle);
        if (off < 0) {
                return -1;
        }

        if (fdt_get_path(fdt_data, off, buf, buflen) != 0)
                return -1;

        return strlen(buf);
}