// SPDX-License-Identifier: GPL-2.0-only

/*

 * fat-pbl.c - PBL FAT filesystem barebox driver

 *

 * Copyright (c) 2019 Ahmad Fatoum, Pengutronix

 */

#define pr_fmt(fmt) "fat-pbl: " fmt

#include <common.h>

#include <pbl/bio.h>

#include "integer.h"

#include "ff.h"

#include "diskio.h"

DRESULT disk_read(FATFS *fat, BYTE *buf, DWORD sector, BYTE count)

{

  int ret = pbl_bio_read(fat->userdata, sector, buf, count);

  return ret != count ? ret : 0;

}

ssize_t pbl_fat_load(struct pbl_bio *bio, const char *filename, void *dest, size_t len)

{

  FATFS fs = {};

  FIL file = {};

  UINT  nread;

  int ret;

  fs.userdata = bio;

  /* mount fs */

  ret = f_mount(&fs);

  if (ret) {

    pr_debug("f_mount(%s) failed: %d\n", filename, ret);

    return ret;

  }

  ret = f_open(&fs, &file, filename, FA_OPEN_EXISTING | FA_READ);

  if (ret) {

    pr_debug("f_open(%s) failed: %d\n", filename, ret);

    return ret;

  }

  pr_debug("Reading file %s to 0x%p\n", filename, dest);

  ret = f_read(&file, dest, len, &nread);

  if (ret) {

    pr_debug("f_read failed: %d\n", ret);

    return ret;

  }

  return f_len(&file) <= len ? nread : -ENOSPC;

}