linux/sound/core/rawmidi_compat.c
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   1/*
   2 *   32bit -> 64bit ioctl wrapper for raw MIDI 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 included from rawmidi.c */
  22
  23#include <linux/compat.h>
  24
  25struct snd_rawmidi_params32 {
  26        s32 stream;
  27        u32 buffer_size;
  28        u32 avail_min;
  29        unsigned int no_active_sensing; /* avoid bit-field */
  30        unsigned char reserved[16];
  31} __attribute__((packed));
  32
  33static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
  34                                           struct snd_rawmidi_params32 __user *src)
  35{
  36        struct snd_rawmidi_params params;
  37        unsigned int val;
  38
  39        if (rfile->output == NULL)
  40                return -EINVAL;
  41        if (get_user(params.stream, &src->stream) ||
  42            get_user(params.buffer_size, &src->buffer_size) ||
  43            get_user(params.avail_min, &src->avail_min) ||
  44            get_user(val, &src->no_active_sensing))
  45                return -EFAULT;
  46        params.no_active_sensing = val;
  47        switch (params.stream) {
  48        case SNDRV_RAWMIDI_STREAM_OUTPUT:
  49                return snd_rawmidi_output_params(rfile->output, &params);
  50        case SNDRV_RAWMIDI_STREAM_INPUT:
  51                return snd_rawmidi_input_params(rfile->input, &params);
  52        }
  53        return -EINVAL;
  54}
  55
  56struct snd_rawmidi_status32 {
  57        s32 stream;
  58        struct compat_timespec tstamp;
  59        u32 avail;
  60        u32 xruns;
  61        unsigned char reserved[16];
  62} __attribute__((packed));
  63
  64static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile,
  65                                           struct snd_rawmidi_status32 __user *src)
  66{
  67        int err;
  68        struct snd_rawmidi_status status;
  69
  70        if (rfile->output == NULL)
  71                return -EINVAL;
  72        if (get_user(status.stream, &src->stream))
  73                return -EFAULT;
  74
  75        switch (status.stream) {
  76        case SNDRV_RAWMIDI_STREAM_OUTPUT:
  77                err = snd_rawmidi_output_status(rfile->output, &status);
  78                break;
  79        case SNDRV_RAWMIDI_STREAM_INPUT:
  80                err = snd_rawmidi_input_status(rfile->input, &status);
  81                break;
  82        default:
  83                return -EINVAL;
  84        }
  85        if (err < 0)
  86                return err;
  87
  88        if (put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) ||
  89            put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) ||
  90            put_user(status.avail, &src->avail) ||
  91            put_user(status.xruns, &src->xruns))
  92                return -EFAULT;
  93
  94        return 0;
  95}
  96
  97enum {
  98        SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
  99        SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
 100};
 101
 102static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 103{
 104        struct snd_rawmidi_file *rfile;
 105        void __user *argp = compat_ptr(arg);
 106
 107        rfile = file->private_data;
 108        switch (cmd) {
 109        case SNDRV_RAWMIDI_IOCTL_PVERSION:
 110        case SNDRV_RAWMIDI_IOCTL_INFO:
 111        case SNDRV_RAWMIDI_IOCTL_DROP:
 112        case SNDRV_RAWMIDI_IOCTL_DRAIN:
 113                return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
 114        case SNDRV_RAWMIDI_IOCTL_PARAMS32:
 115                return snd_rawmidi_ioctl_params_compat(rfile, argp);
 116        case SNDRV_RAWMIDI_IOCTL_STATUS32:
 117                return snd_rawmidi_ioctl_status_compat(rfile, argp);
 118        }
 119        return -ENOIOCTLCMD;
 120}
 121
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