rawmidi_compat.c

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/*
 *   32bit -> 64bit ioctl wrapper for raw MIDI API
 *   Copyright (c) by Takashi Iwai <[email protected]>
 *
 *   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
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   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 included from rawmidi.c */

#include <linux/compat.h>

struct snd_rawmidi_params32 {
    s32 stream;
    u32 buffer_size;
    u32 avail_min;
    unsigned int no_active_sensing; /* avoid bit-field */
    unsigned char reserved[16];
} __attribute__((packed));

static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
                       struct snd_rawmidi_params32 __user *src)
{
    struct snd_rawmidi_params params;
    unsigned int val;

    if (rfile->output == NULL)
        return -EINVAL;
    if (get_user(params.stream, &src->stream) ||
        get_user(params.buffer_size, &src->buffer_size) ||
        get_user(params.avail_min, &src->avail_min) ||
        get_user(val, &src->no_active_sensing))
        return -EFAULT;
    params.no_active_sensing = val;
    switch (params.stream) {
    case SNDRV_RAWMIDI_STREAM_OUTPUT:
        return snd_rawmidi_output_params(rfile->output, &params);
    case SNDRV_RAWMIDI_STREAM_INPUT:
        return snd_rawmidi_input_params(rfile->input, &params);
    }
    return -EINVAL;
}

struct snd_rawmidi_status32 {
    s32 stream;
    struct compat_timespec tstamp;
    u32 avail;
    u32 xruns;
    unsigned char reserved[16];
} __attribute__((packed));

static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile,
                       struct snd_rawmidi_status32 __user *src)
{
    int err;
    struct snd_rawmidi_status status;

    if (rfile->output == NULL)
        return -EINVAL;
    if (get_user(status.stream, &src->stream))
        return -EFAULT;

    switch (status.stream) {
    case SNDRV_RAWMIDI_STREAM_OUTPUT:
        err = snd_rawmidi_output_status(rfile->output, &status);
        break;
    case SNDRV_RAWMIDI_STREAM_INPUT:
        err = snd_rawmidi_input_status(rfile->input, &status);
        break;
    default:
        return -EINVAL;
    }
    if (err < 0)
        return err;

    if (put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) ||
        put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) ||
        put_user(status.avail, &src->avail) ||
        put_user(status.xruns, &src->xruns))
        return -EFAULT;

    return 0;
}

enum {
    SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
    SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
};

static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
{
    struct snd_rawmidi_file *rfile;
    void __user *argp = compat_ptr(arg);

    rfile = file->private_data;
    switch (cmd) {
    case SNDRV_RAWMIDI_IOCTL_PVERSION:
    case SNDRV_RAWMIDI_IOCTL_INFO:
    case SNDRV_RAWMIDI_IOCTL_DROP:
    case SNDRV_RAWMIDI_IOCTL_DRAIN:
        return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
    case SNDRV_RAWMIDI_IOCTL_PARAMS32:
        return snd_rawmidi_ioctl_params_compat(rfile, argp);
    case SNDRV_RAWMIDI_IOCTL_STATUS32:
        return snd_rawmidi_ioctl_status_compat(rfile, argp);
    }
    return -ENOIOCTLCMD;
}