/* $NetBSD: drvctl.c,v 1.3 2021/06/21 03:04:27 christos Exp $ */

/*
 * Copyright (c) 2010 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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 <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "drvctl.h"

static int
drvctl_list(int fd, const char *name, struct devlistargs *laa)
{
        size_t children;

        memset(laa, 0, sizeof(*laa));
        strlcpy(laa->l_devname, name, sizeof(laa->l_devname));
        if (ioctl(fd, DRVLISTDEV, laa) == -1)
                return -1;
        children = laa->l_children;
        laa->l_childname = malloc(children * sizeof(laa->l_childname[0]));
        if (laa->l_childname == NULL)
                return -1;
        if (ioctl(fd, DRVLISTDEV, laa) == -1)
                return -1;
        return 0;
}

static bool
drvctl_get_properties(int fd, const char *devnode, prop_dictionary_t *props)
{
        prop_dictionary_t command_dict;
        prop_dictionary_t args_dict;
        prop_dictionary_t results_dict;
        int8_t perr;
        int error;
        bool rv;

        command_dict = prop_dictionary_create();
        args_dict = prop_dictionary_create();

        prop_dictionary_set_string_nocopy(command_dict, "drvctl-command",
            "get-properties");
        prop_dictionary_set_string_nocopy(args_dict, "device-name", devnode);
        prop_dictionary_set(command_dict, "drvctl-arguments", args_dict);
        prop_object_release(args_dict);

        error = prop_dictionary_sendrecv_ioctl(command_dict, fd,
            DRVCTLCOMMAND, &results_dict);
        prop_object_release(command_dict);
        if (error)
                return false;

        rv = prop_dictionary_get_int8(results_dict, "drvctl-error", &perr);
        if (rv == false || perr != 0) {
                prop_object_release(results_dict);
                return false;
        }

        if (props) {
                prop_dictionary_t result_data;
                result_data = prop_dictionary_get(results_dict,
                    "drvctl-result-data");
                if (result_data)
                        *props = prop_dictionary_copy(result_data);
        }

        prop_object_release(results_dict);

        return true;
}

static int
drvctl_search(int fd, const char *curnode, const char *dvname,
    void (*callback)(void *, const char *, const char *, unsigned int),
    void *args)
{
        struct devlistargs laa;
        unsigned int i;
        uint32_t unit;
        bool rv;

        if (drvctl_list(fd, curnode, &laa) == -1)
                return -1;

        for (i = 0; i < laa.l_children; i++) {
                prop_dictionary_t props = NULL;
                const char *curdvname;

                rv = drvctl_get_properties(fd, laa.l_childname[i], &props);
                if (rv == false || props == NULL)
                        continue;
                rv = prop_dictionary_get_string(props,
                    "device-driver", &curdvname);
                if (rv == true && strcmp(curdvname, dvname) == 0) {
                        rv = prop_dictionary_get_uint32(props,
                            "device-unit", &unit);
                        if (rv == true)
                                callback(args, curnode,
                                    laa.l_childname[i], unit);
                }
                prop_object_release(props);

                if (drvctl_search(fd, laa.l_childname[i], dvname,
                    callback, args) == -1)
                        return -1;
        }

        return 0;
}

int
drvctl_foreach(int fd, const char *dvname,
    void (*callback)(void *, const char *, const char *, unsigned int),
    void *args)
{
        return drvctl_search(fd, "", dvname, callback, args);
}