timer_compat.c

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/*
 *   32bit -> 64bit ioctl wrapper for timer 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 timer.c */

#include <linux/compat.h>

struct snd_timer_info32 {
    u32 flags;
    s32 card;
    unsigned char id[64];
    unsigned char name[80];
    u32 reserved0;
    u32 resolution;
    unsigned char reserved[64];
};

static int snd_timer_user_info_compat(struct file *file,
                      struct snd_timer_info32 __user *_info)
{
    struct snd_timer_user *tu;
    struct snd_timer_info32 info;
    struct snd_timer *t;

    tu = file->private_data;
    if (snd_BUG_ON(!tu->timeri))
        return -ENXIO;
    t = tu->timeri->timer;
    if (snd_BUG_ON(!t))
        return -ENXIO;
    memset(&info, 0, sizeof(info));
    info.card = t->card ? t->card->number : -1;
    if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
        info.flags |= SNDRV_TIMER_FLG_SLAVE;
    strlcpy(info.id, t->id, sizeof(info.id));
    strlcpy(info.name, t->name, sizeof(info.name));
    info.resolution = t->hw.resolution;
    if (copy_to_user(_info, &info, sizeof(*_info)))
        return -EFAULT;
    return 0;
}

struct snd_timer_status32 {
    struct compat_timespec tstamp;
    u32 resolution;
    u32 lost;
    u32 overrun;
    u32 queue;
    unsigned char reserved[64];
};

static int snd_timer_user_status_compat(struct file *file,
                    struct snd_timer_status32 __user *_status)
{
    struct snd_timer_user *tu;
    struct snd_timer_status status;
    
    tu = file->private_data;
    if (snd_BUG_ON(!tu->timeri))
        return -ENXIO;
    memset(&status, 0, sizeof(status));
    status.tstamp = tu->tstamp;
    status.resolution = snd_timer_resolution(tu->timeri);
    status.lost = tu->timeri->lost;
    status.overrun = tu->overrun;
    spin_lock_irq(&tu->qlock);
    status.queue = tu->qused;
    spin_unlock_irq(&tu->qlock);
    if (copy_to_user(_status, &status, sizeof(status)))
        return -EFAULT;
    return 0;
}

/*
 */

enum {
    SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32),
    SNDRV_TIMER_IOCTL_STATUS32 = _IOW('T', 0x14, struct snd_timer_status32),
};

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

    switch (cmd) {
    case SNDRV_TIMER_IOCTL_PVERSION:
    case SNDRV_TIMER_IOCTL_TREAD:
    case SNDRV_TIMER_IOCTL_GINFO:
    case SNDRV_TIMER_IOCTL_GPARAMS:
    case SNDRV_TIMER_IOCTL_GSTATUS:
    case SNDRV_TIMER_IOCTL_SELECT:
    case SNDRV_TIMER_IOCTL_PARAMS:
    case SNDRV_TIMER_IOCTL_START:
    case SNDRV_TIMER_IOCTL_START_OLD:
    case SNDRV_TIMER_IOCTL_STOP:
    case SNDRV_TIMER_IOCTL_STOP_OLD:
    case SNDRV_TIMER_IOCTL_CONTINUE:
    case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
    case SNDRV_TIMER_IOCTL_PAUSE:
    case SNDRV_TIMER_IOCTL_PAUSE_OLD:
    case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
        return snd_timer_user_ioctl(file, cmd, (unsigned long)argp);
    case SNDRV_TIMER_IOCTL_INFO32:
        return snd_timer_user_info_compat(file, argp);
    case SNDRV_TIMER_IOCTL_STATUS32:
        return snd_timer_user_status_compat(file, argp);
    }
    return -ENOIOCTLCMD;
}