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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/sound/core/seq/seq_compat.c
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// SPDX-License-Identifier: GPL-2.0-or-later

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/*

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 *   32bit -> 64bit ioctl wrapper for sequencer API

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 *   Copyright (c) by Takashi Iwai <[email protected]>

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 */

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/* This file included from seq.c */

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#include <linux/compat.h>

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#include <linux/slab.h>

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struct snd_seq_port_info32 {

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	struct snd_seq_addr addr;	/* client/port numbers */

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	char name[64];			/* port name */

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	u32 capability;	/* port capability bits */

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	u32 type;		/* port type bits */

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	s32 midi_channels;		/* channels per MIDI port */

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	s32 midi_voices;		/* voices per MIDI port */

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	s32 synth_voices;		/* voices per SYNTH port */

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	s32 read_use;			/* R/O: subscribers for output (from this port) */

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	s32 write_use;			/* R/O: subscribers for input (to this port) */

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	u32 kernel;			/* reserved for kernel use (must be NULL) */

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	u32 flags;		/* misc. conditioning */

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	unsigned char time_queue;	/* queue # for timestamping */

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	char reserved[59];		/* for future use */

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};

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static int snd_seq_call_port_info_ioctl(struct snd_seq_client *client, unsigned int cmd,

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					struct snd_seq_port_info32 __user *data32)

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{

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	struct snd_seq_port_info *data __free(kfree) = NULL;

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	int err;

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	data = kmalloc(sizeof(*data), GFP_KERNEL);

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	if (!data)

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		return -ENOMEM;

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	if (copy_from_user(data, data32, sizeof(*data32)) ||

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	    get_user(data->flags, &data32->flags) ||

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	    get_user(data->time_queue, &data32->time_queue))

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		return -EFAULT;

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	data->kernel = NULL;

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	err = snd_seq_kernel_client_ctl(client->number, cmd, data);

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	if (err < 0)

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		return err;

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	if (copy_to_user(data32, data, sizeof(*data32)) ||

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	    put_user(data->flags, &data32->flags) ||

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	    put_user(data->time_queue, &data32->time_queue))

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		return -EFAULT;

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	return err;

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}

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/*

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 */

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enum {

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	SNDRV_SEQ_IOCTL_CREATE_PORT32 = _IOWR('S', 0x20, struct snd_seq_port_info32),

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	SNDRV_SEQ_IOCTL_DELETE_PORT32 = _IOW ('S', 0x21, struct snd_seq_port_info32),

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	SNDRV_SEQ_IOCTL_GET_PORT_INFO32 = _IOWR('S', 0x22, struct snd_seq_port_info32),

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	SNDRV_SEQ_IOCTL_SET_PORT_INFO32 = _IOW ('S', 0x23, struct snd_seq_port_info32),

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	SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT32 = _IOWR('S', 0x52, struct snd_seq_port_info32),

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};

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static long snd_seq_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)

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{

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	struct snd_seq_client *client = file->private_data;

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	void __user *argp = compat_ptr(arg);

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	if (snd_BUG_ON(!client))

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		return -ENXIO;

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	switch (cmd) {

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	case SNDRV_SEQ_IOCTL_PVERSION:

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	case SNDRV_SEQ_IOCTL_USER_PVERSION:

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	case SNDRV_SEQ_IOCTL_CLIENT_ID:

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	case SNDRV_SEQ_IOCTL_SYSTEM_INFO:

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	case SNDRV_SEQ_IOCTL_GET_CLIENT_INFO:

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	case SNDRV_SEQ_IOCTL_SET_CLIENT_INFO:

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	case SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO:

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	case SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO:

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	case SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT:

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	case SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT:

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	case SNDRV_SEQ_IOCTL_CREATE_QUEUE:

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	case SNDRV_SEQ_IOCTL_DELETE_QUEUE:

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	case SNDRV_SEQ_IOCTL_GET_QUEUE_INFO:

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	case SNDRV_SEQ_IOCTL_SET_QUEUE_INFO:

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	case SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE:

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	case SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS:

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	case SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO:

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	case SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO:

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	case SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER:

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	case SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER:

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	case SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT:

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	case SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT:

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	case SNDRV_SEQ_IOCTL_GET_CLIENT_POOL:

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	case SNDRV_SEQ_IOCTL_SET_CLIENT_POOL:

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	case SNDRV_SEQ_IOCTL_REMOVE_EVENTS:

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	case SNDRV_SEQ_IOCTL_QUERY_SUBS:

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	case SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION:

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	case SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT:

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	case SNDRV_SEQ_IOCTL_RUNNING_MODE:

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		return snd_seq_ioctl(file, cmd, arg);

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	case SNDRV_SEQ_IOCTL_CREATE_PORT32:

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		return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_CREATE_PORT, argp);

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	case SNDRV_SEQ_IOCTL_DELETE_PORT32:

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		return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_DELETE_PORT, argp);

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	case SNDRV_SEQ_IOCTL_GET_PORT_INFO32:

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		return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_GET_PORT_INFO, argp);

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	case SNDRV_SEQ_IOCTL_SET_PORT_INFO32:

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		return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_SET_PORT_INFO, argp);

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	case SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT32:

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		return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, argp);

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	}

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	return -ENOIOCTLCMD;

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}

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