/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2013 Adrian Chadd <adrian@freebsd.org>
 * Copyright (c) 2019 Vladimir Kondratyev <wulf@FreeBSD.org>
 * Copyright (c) 2023 Future Crew LLC.
 *
 * 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 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 AUTHOR 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 <sys/types.h>
#include <sys/endian.h>
#include <sys/stat.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "iwmbt_fw.h"
#include "iwmbt_dbg.h"

int
iwmbt_fw_read(struct iwmbt_firmware *fw, const char *fwname)
{
        int fd;
        struct stat sb;
        unsigned char *buf;
        ssize_t r;

        fd = open(fwname, O_RDONLY);
        if (fd < 0) {
                warn("%s: open: %s", __func__, fwname);
                return (0);
        }

        if (fstat(fd, &sb) != 0) {
                warn("%s: stat: %s", __func__, fwname);
                close(fd);
                return (0);
        }

        buf = calloc(1, sb.st_size);
        if (buf == NULL) {
                warn("%s: calloc", __func__);
                close(fd);
                return (0);
        }

        /* XXX handle partial reads */
        r = read(fd, buf, sb.st_size);
        if (r < 0) {
                warn("%s: read", __func__);
                free(buf);
                close(fd);
                return (0);
        }

        if (r != sb.st_size) {
                iwmbt_err("read len %d != file size %d",
                    (int) r,
                    (int) sb.st_size);
                free(buf);
                close(fd);
                return (0);
        }

        /* We have everything, so! */

        memset(fw, 0, sizeof(*fw));

        fw->fwname = strdup(fwname);
        fw->len = sb.st_size;
        fw->buf = buf;

        close(fd);
        return (1);
}

void
iwmbt_fw_free(struct iwmbt_firmware *fw)
{
        if (fw->fwname)
                free(fw->fwname);
        if (fw->buf)
                free(fw->buf);
        memset(fw, 0, sizeof(*fw));
}

char *
iwmbt_get_fwname(struct iwmbt_version *ver, struct iwmbt_boot_params *params,
    const char *prefix, const char *suffix)
{
        struct stat sb;
        char *fwname;

        switch (ver->hw_variant) {
        case 0x07:      /* 7260 */
        case 0x08:      /* 7265 */
                // NB: don't use params, they are NULL for 7xxx
                asprintf(&fwname, "%s/ibt-hw-%x.%x.%x-fw-%x.%x.%x.%x.%x.%s",
                    prefix,
                    le16toh(ver->hw_platform),
                    le16toh(ver->hw_variant),
                    le16toh(ver->hw_revision),
                    le16toh(ver->fw_variant),
                    le16toh(ver->fw_revision),
                    le16toh(ver->fw_build_num),
                    le16toh(ver->fw_build_ww),
                    le16toh(ver->fw_build_yy),
                    suffix);
                /*
                 * Fallback to the default firmware patch if
                 * the correct firmware patch file is not found.
                 */
                if (stat(fwname, &sb) != 0 && errno == ENOENT) {
                        free(fwname);
                        asprintf(&fwname, "%s/ibt-hw-%x.%x.%s",
                            prefix,
                            le16toh(ver->hw_platform),
                            le16toh(ver->hw_variant),
                            suffix);
                }
                break;

        case 0x0b:      /* 8260 */
        case 0x0c:      /* 8265 */
                asprintf(&fwname, "%s/ibt-%u-%u.%s",
                    prefix,
                    le16toh(ver->hw_variant),
                    le16toh(params->dev_revid),
                    suffix);
                break;

        case 0x11:      /* 9560 */
        case 0x12:      /* 9260 */
        case 0x13:
        case 0x14:      /* 22161 */
                asprintf(&fwname, "%s/ibt-%u-%u-%u.%s",
                    prefix,
                    le16toh(ver->hw_variant),
                    le16toh(ver->hw_revision),
                    le16toh(ver->fw_revision),
                    suffix);
                break;

        default:
                fwname = NULL;
        }

        return (fwname);
}

char *
iwmbt_get_fwname_tlv(struct iwmbt_version_tlv *ver, const char *prefix,
    const char *suffix)
{
        char *fwname;

#define IWMBT_PACK_CNVX_TOP(cnvx_top)   ((uint16_t)(    \
        ((cnvx_top) & 0x0f000000) >> 16 |               \
        ((cnvx_top) & 0x0000000f) << 12 |               \
        ((cnvx_top) & 0x00000ff0) >> 4))

        asprintf(&fwname, "%s/ibt-%04x-%04x.%s",
            prefix,
            IWMBT_PACK_CNVX_TOP(ver->cnvi_top),
            IWMBT_PACK_CNVX_TOP(ver->cnvr_top),
            suffix);

        return (fwname);
}