LXR linux/drivers/staging/gdm724x/gdm

   1/*
   2 * Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
   3 *
   4 * This software is licensed under the terms of the GNU General Public
   5 * License version 2, as published by the Free Software Foundation, and
   6 * may be copied, distributed, and modified under those terms.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11 * GNU General Public License for more details.
  12 */
  13
  14#include <linux/slab.h>
  15#include "gdm_endian.h"
  16
  17void gdm_set_endian(struct gdm_endian *ed, u8 dev_endian)
  18{
  19        u8 a[2] = {0x12, 0x34};
  20        u8 b[2] = {0, };
  21        u16 c = 0x1234;
  22
  23        if (dev_endian == ENDIANNESS_BIG)
  24                ed->dev_ed = ENDIANNESS_BIG;
  25        else
  26                ed->dev_ed = ENDIANNESS_LITTLE;
  27
  28        memcpy(b, &c, 2);
  29
  30        if (a[0] != b[0])
  31                ed->host_ed = ENDIANNESS_LITTLE;
  32        else
  33                ed->host_ed = ENDIANNESS_BIG;
  34
  35}
  36
  37u16 gdm_cpu_to_dev16(struct gdm_endian *ed, u16 x)
  38{
  39        if (ed->dev_ed == ed->host_ed)
  40                return x;
  41
  42        return Endian16_Swap(x);
  43}
  44
  45u16 gdm_dev16_to_cpu(struct gdm_endian *ed, u16 x)
  46{
  47        if (ed->dev_ed == ed->host_ed)
  48                return x;
  49
  50        return Endian16_Swap(x);
  51}
  52
  53u32 gdm_cpu_to_dev32(struct gdm_endian *ed, u32 x)
  54{
  55        if (ed->dev_ed == ed->host_ed)
  56                return x;
  57
  58        return Endian32_Swap(x);
  59}
  60
  61u32 gdm_dev32_to_cpu(struct gdm_endian *ed, u32 x)
  62{
  63        if (ed->dev_ed == ed->host_ed)
  64                return x;
  65
  66        return Endian32_Swap(x);
  67}
  68