sound/core/hwdep_compat.c

   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
  25 struct 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
  33 static 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
  58 enum {
  59         SNDRV_HWDEP_IOCTL_DSP_LOAD32   = _IOW('H', 0x03, struct snd_hwdep_dsp_image32)
  60 };
  61
  62 static 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 }