1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *   32bit -> 64bit ioctl wrapper for raw MIDI API
4 *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
5 */
6
7/* This file included from rawmidi.c */
8
9#include <linux/compat.h>
10
11struct snd_rawmidi_params32 {
12	s32 stream;
13	u32 buffer_size;
14	u32 avail_min;
15	unsigned int no_active_sensing; /* avoid bit-field */
16	unsigned char reserved[16];
17} __attribute__((packed));
18
19static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
20					   struct snd_rawmidi_params32 __user *src)
21{
22	struct snd_rawmidi_params params;
23	unsigned int val;
24
25	if (get_user(params.stream, &src->stream) ||
26	    get_user(params.buffer_size, &src->buffer_size) ||
27	    get_user(params.avail_min, &src->avail_min) ||
28	    get_user(val, &src->no_active_sensing))
29		return -EFAULT;
30	params.no_active_sensing = val;
31	switch (params.stream) {
32	case SNDRV_RAWMIDI_STREAM_OUTPUT:
33		if (!rfile->output)
34			return -EINVAL;
35		return snd_rawmidi_output_params(rfile->output, &params);
36	case SNDRV_RAWMIDI_STREAM_INPUT:
37		if (!rfile->input)
38			return -EINVAL;
39		return snd_rawmidi_input_params(rfile->input, &params);
40	}
41	return -EINVAL;
42}
43
44struct compat_snd_rawmidi_status64 {
45	s32 stream;
46	u8 rsvd[4]; /* alignment */
47	s64 tstamp_sec;
48	s64 tstamp_nsec;
49	u32 avail;
50	u32 xruns;
51	unsigned char reserved[16];
52} __attribute__((packed));
53
54static int snd_rawmidi_ioctl_status_compat64(struct snd_rawmidi_file *rfile,
55					     struct compat_snd_rawmidi_status64 __user *src)
56{
57	int err;
58	struct snd_rawmidi_status64 status;
59	struct compat_snd_rawmidi_status64 compat_status;
60
61	if (get_user(status.stream, &src->stream))
62		return -EFAULT;
63
64	switch (status.stream) {
65	case SNDRV_RAWMIDI_STREAM_OUTPUT:
66		if (!rfile->output)
67			return -EINVAL;
68		err = snd_rawmidi_output_status(rfile->output, &status);
69		break;
70	case SNDRV_RAWMIDI_STREAM_INPUT:
71		if (!rfile->input)
72			return -EINVAL;
73		err = snd_rawmidi_input_status(rfile->input, &status);
74		break;
75	default:
76		return -EINVAL;
77	}
78	if (err < 0)
79		return err;
80
81	compat_status = (struct compat_snd_rawmidi_status64) {
82		.stream = status.stream,
83		.tstamp_sec = status.tstamp_sec,
84		.tstamp_nsec = status.tstamp_nsec,
85		.avail = status.avail,
86		.xruns = status.xruns,
87	};
88
89	if (copy_to_user(src, &compat_status, sizeof(*src)))
90		return -EFAULT;
91
92	return 0;
93}
94
95enum {
96	SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
97	SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
98	SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64 = _IOWR('W', 0x20, struct compat_snd_rawmidi_status64),
99};
100
101static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
102{
103	struct snd_rawmidi_file *rfile;
104	void __user *argp = compat_ptr(arg);
105
106	rfile = file->private_data;
107	switch (cmd) {
108	case SNDRV_RAWMIDI_IOCTL_PVERSION:
109	case SNDRV_RAWMIDI_IOCTL_INFO:
110	case SNDRV_RAWMIDI_IOCTL_DROP:
111	case SNDRV_RAWMIDI_IOCTL_DRAIN:
112		return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
113	case SNDRV_RAWMIDI_IOCTL_PARAMS32:
114		return snd_rawmidi_ioctl_params_compat(rfile, argp);
115	case SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT32:
116		return snd_rawmidi_ioctl_status32(rfile, argp);
117	case SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64:
118		return snd_rawmidi_ioctl_status_compat64(rfile, argp);
119	}
120	return -ENOIOCTLCMD;
121}
122