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 *   32bit -> 64bit ioctl helpers
 *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   GNU General Public License for more details.
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 * This file registers the converters from 32-bit ioctls to 64-bit ones.
 * The converter assumes that a 32-bit user-pointer can be casted by compat_ptr(x)
 * macro to a valid 64-bit pointer which is accessible via copy_from/to_user.

#ifndef __ALSA_IOCTL32_H
#define __ALSA_IOCTL32_H

#include <linux/compat.h>

#define COPY(x) \
      do { \
            if (copy_in_user(&dst->x, &src->x, sizeof(dst->x))) \
                  return -EFAULT; \
      } while (0)

#define COPY_ARRAY(x) \
      do { \
            if (copy_in_user(dst->x, src->x, sizeof(dst->x))) \
                  return -EFAULT; \
      } while (0)

#define COPY_CVT(x) \
      do { \
            __typeof__(src->x) __val_tmp; \
            if (get_user(__val_tmp, &src->x) || \
                put_user(__val_tmp, &dst->x))\
                  return -EFAULT; \
      } while (0)

#define convert_from_32(type, dstp, srcp)\
      struct snd_##type __user *dst = dstp;\
      struct snd_##type##32 __user *src = srcp;\

#define convert_to_32(type, dstp, srcp)\
      struct snd_##type __user *src = srcp;\
      struct snd_##type##32 __user *dst = dstp;\

#define DEFINE_ALSA_IOCTL(type) \
static inline int _snd_ioctl32_##type(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file, unsigned int native_ctl)\
      struct snd_##type##32 __user *data32;\
      struct snd_##type __user *data;\
      int err;\
      data32 = compat_ptr(arg);\
      data = compat_alloc_user_space(sizeof(*data));\
      convert_from_32(type, data, data32);\
      err = file->f_op->ioctl(file->f_dentry->d_inode, file, native_ctl, (unsigned long)data);\
      if (err < 0) \
            return err;\
      if (native_ctl & (_IOC_READ << _IOC_DIRSHIFT)) {\
            convert_to_32(type, data32, data);\
      return 0;\

#define DEFINE_ALSA_IOCTL_ENTRY(name,type,native_ctl) \
static int snd_ioctl32_##name(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file) {\
      return _snd_ioctl32_##type(fd, cmd, arg, file, native_ctl);\

#define MAP_COMPAT(ctl) { ctl, snd_ioctl32_compat }

struct ioctl32_mapper {
      unsigned int cmd;
      int (*handler)(unsigned int, unsigned int, unsigned long, struct file * filp);
      int registered;

int snd_ioctl32_compat(unsigned int, unsigned int, unsigned long, struct file *);

int snd_ioctl32_register(struct ioctl32_mapper *mappers);
void snd_ioctl32_unregister(struct ioctl32_mapper *mappers);

#endif /* __ALSA_IOCTL32_H */

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