// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   32bit -> 64bit ioctl wrapper for timer API
 *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
 */

/* This file included from timer.c */

#include <linux/compat.h>

/*
 * ILP32/LP64 has different size for 'long' type. Additionally, the size
 * of storage alignment differs depending on architectures. Here, '__packed'
 * qualifier is used so that the size of this structure is multiple of 4 and
 * it fits to any architectures with 32 bit storage alignment.
 */
struct snd_timer_gparams32 {
        struct snd_timer_id tid;
        u32 period_num;
        u32 period_den;
        unsigned char reserved[32];
} __packed;

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_gparams_compat(struct file *file,
                                        struct snd_timer_gparams32 __user *user)
{
        struct snd_timer_gparams gparams;

        if (copy_from_user(&gparams.tid, &user->tid, sizeof(gparams.tid)) ||
            get_user(gparams.period_num, &user->period_num) ||
            get_user(gparams.period_den, &user->period_den))
                return -EFAULT;

        return timer_set_gparams(&gparams);
}

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 (!tu->timeri)
                return -EBADFD;
        t = tu->timeri->timer;
        if (!t)
                return -EBADFD;
        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;
        strscpy(info.id, t->id, sizeof(info.id));
        strscpy(info.name, t->name, sizeof(info.name));
        info.resolution = t->hw.resolution;
        if (copy_to_user(_info, &info, sizeof(*_info)))
                return -EFAULT;
        return 0;
}

enum {
        SNDRV_TIMER_IOCTL_GPARAMS32 = _IOW('T', 0x04, struct snd_timer_gparams32),
        SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32),
        SNDRV_TIMER_IOCTL_STATUS_COMPAT32 = _IOW('T', 0x14, struct snd_timer_status32),
        SNDRV_TIMER_IOCTL_STATUS_COMPAT64 = _IOW('T', 0x14, struct snd_timer_status64),
};

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_OLD:
        case SNDRV_TIMER_IOCTL_TREAD64:
        case SNDRV_TIMER_IOCTL_GINFO:
        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, true);
        case SNDRV_TIMER_IOCTL_GPARAMS32:
                return snd_timer_user_gparams_compat(file, argp);
        case SNDRV_TIMER_IOCTL_INFO32:
                return snd_timer_user_info_compat(file, argp);
        case SNDRV_TIMER_IOCTL_STATUS_COMPAT32:
                return snd_timer_user_status32(file, argp);
        case SNDRV_TIMER_IOCTL_STATUS_COMPAT64:
                return snd_timer_user_status64(file, argp);
        }
        return -ENOIOCTLCMD;
}

static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
                                        unsigned long arg)
{
        struct snd_timer_user *tu = file->private_data;

        guard(mutex)(&tu->ioctl_lock);
        return __snd_timer_user_ioctl_compat(file, cmd, arg);
}