linux/sound/core/hwdep_compat.c
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   1/*
   2 *   32bit -> 64bit ioctl wrapper for hwdep API
   3 *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
   4 *
   5 *   This program is free software; you can redistribute it and/or modify
   6 *   it under the terms of the GNU General Public License as published by
   7 *   the Free Software Foundation; either version 2 of the License, or
   8 *   (at your option) any later version.
   9 *
  10 *   This program is distributed in the hope that it will be useful,
  11 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 *   GNU General Public License for more details.
  14 *
  15 *   You should have received a copy of the GNU General Public License
  16 *   along with this program; if not, write to the Free Software
  17 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18 *
  19 */
  20
  21/* This file is included from hwdep.c */
  22
  23#include <linux/compat.h>
  24
  25struct snd_hwdep_dsp_image32 {
  26        u32 index;
  27        unsigned char name[64];
  28        u32 image;      /* pointer */
  29        u32 length;
  30        u32 driver_data;
  31} /* don't set packed attribute here */;
  32
  33static int snd_hwdep_dsp_load_compat(struct snd_hwdep *hw,
  34                                     struct snd_hwdep_dsp_image32 __user *src)
  35{
  36        struct snd_hwdep_dsp_image __user *dst;
  37        compat_caddr_t ptr;
  38        u32 val;
  39
  40        dst = compat_alloc_user_space(sizeof(*dst));
  41
  42        /* index and name */
  43        if (copy_in_user(dst, src, 4 + 64))
  44                return -EFAULT;
  45        if (get_user(ptr, &src->image) ||
  46            put_user(compat_ptr(ptr), &dst->image))
  47                return -EFAULT;
  48        if (get_user(val, &src->length) ||
  49            put_user(val, &dst->length))
  50                return -EFAULT;
  51        if (get_user(val, &src->driver_data) ||
  52            put_user(val, &dst->driver_data))
  53                return -EFAULT;
  54
  55        return snd_hwdep_dsp_load(hw, dst);
  56}
  57
  58enum {
  59        SNDRV_HWDEP_IOCTL_DSP_LOAD32   = _IOW('H', 0x03, struct snd_hwdep_dsp_image32)
  60};
  61
  62static long snd_hwdep_ioctl_compat(struct file * file, unsigned int cmd,
  63                                   unsigned long arg)
  64{
  65        struct snd_hwdep *hw = file->private_data;
  66        void __user *argp = compat_ptr(arg);
  67        switch (cmd) {
  68        case SNDRV_HWDEP_IOCTL_PVERSION:
  69        case SNDRV_HWDEP_IOCTL_INFO:
  70        case SNDRV_HWDEP_IOCTL_DSP_STATUS:
  71                return snd_hwdep_ioctl(file, cmd, (unsigned long)argp);
  72        case SNDRV_HWDEP_IOCTL_DSP_LOAD32:
  73                return snd_hwdep_dsp_load_compat(hw, argp);
  74        }
  75        if (hw->ops.ioctl_compat)
  76                return hw->ops.ioctl_compat(hw, file, cmd, arg);
  77        return -ENOIOCTLCMD;
  78}
  79
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