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

/* 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 int mode;
        unsigned char reserved[12];
} __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 (get_user(params.stream, &src->stream) ||
            get_user(params.buffer_size, &src->buffer_size) ||
            get_user(params.avail_min, &src->avail_min) ||
            get_user(params.mode, &src->mode) ||
            get_user(val, &src->no_active_sensing))
                return -EFAULT;
        params.no_active_sensing = val;
        switch (params.stream) {
        case SNDRV_RAWMIDI_STREAM_OUTPUT:
                if (!rfile->output)
                        return -EINVAL;
                return snd_rawmidi_output_params(rfile->output, &params);
        case SNDRV_RAWMIDI_STREAM_INPUT:
                if (!rfile->input)
                        return -EINVAL;
                return snd_rawmidi_input_params(rfile->input, &params);
        }
        return -EINVAL;
}

struct compat_snd_rawmidi_status64 {
        s32 stream;
        u8 rsvd[4]; /* alignment */
        s64 tstamp_sec;
        s64 tstamp_nsec;
        u32 avail;
        u32 xruns;
        unsigned char reserved[16];
} __packed;

static int snd_rawmidi_ioctl_status_compat64(struct snd_rawmidi_file *rfile,
                                             struct compat_snd_rawmidi_status64 __user *src)
{
        int err;
        struct snd_rawmidi_status64 status;
        struct compat_snd_rawmidi_status64 compat_status;

        if (get_user(status.stream, &src->stream))
                return -EFAULT;

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

        compat_status = (struct compat_snd_rawmidi_status64) {
                .stream = status.stream,
                .tstamp_sec = status.tstamp_sec,
                .tstamp_nsec = status.tstamp_nsec,
                .avail = status.avail,
                .xruns = status.xruns,
        };

        if (copy_to_user(src, &compat_status, sizeof(*src)))
                return -EFAULT;

        return 0;
}

enum {
        SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
        SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
        SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64 = _IOWR('W', 0x20, struct compat_snd_rawmidi_status64),
};

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:
#if IS_ENABLED(CONFIG_SND_UMP)
        case SNDRV_UMP_IOCTL_ENDPOINT_INFO:
        case SNDRV_UMP_IOCTL_BLOCK_INFO:
#endif
                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_STATUS_COMPAT32:
                return snd_rawmidi_ioctl_status32(rfile, argp);
        case SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64:
                return snd_rawmidi_ioctl_status_compat64(rfile, argp);
        }
        return -ENOIOCTLCMD;
}