Root/sound/core/rawmidi_compat.c

1/*
2 * 32bit -> 64bit ioctl wrapper for raw MIDI API
3 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 */
20
21/* This file included from rawmidi.c */
22
23#include <linux/compat.h>
24
25struct snd_rawmidi_params32 {
26    s32 stream;
27    u32 buffer_size;
28    u32 avail_min;
29    unsigned int no_active_sensing; /* avoid bit-field */
30    unsigned char reserved[16];
31} __attribute__((packed));
32
33static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
34                       struct snd_rawmidi_params32 __user *src)
35{
36    struct snd_rawmidi_params params;
37    unsigned int val;
38
39    if (rfile->output == NULL)
40        return -EINVAL;
41    if (get_user(params.stream, &src->stream) ||
42        get_user(params.buffer_size, &src->buffer_size) ||
43        get_user(params.avail_min, &src->avail_min) ||
44        get_user(val, &src->no_active_sensing))
45        return -EFAULT;
46    params.no_active_sensing = val;
47    switch (params.stream) {
48    case SNDRV_RAWMIDI_STREAM_OUTPUT:
49        return snd_rawmidi_output_params(rfile->output, &params);
50    case SNDRV_RAWMIDI_STREAM_INPUT:
51        return snd_rawmidi_input_params(rfile->input, &params);
52    }
53    return -EINVAL;
54}
55
56struct snd_rawmidi_status32 {
57    s32 stream;
58    struct compat_timespec tstamp;
59    u32 avail;
60    u32 xruns;
61    unsigned char reserved[16];
62} __attribute__((packed));
63
64static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile,
65                       struct snd_rawmidi_status32 __user *src)
66{
67    int err;
68    struct snd_rawmidi_status status;
69
70    if (rfile->output == NULL)
71        return -EINVAL;
72    if (get_user(status.stream, &src->stream))
73        return -EFAULT;
74
75    switch (status.stream) {
76    case SNDRV_RAWMIDI_STREAM_OUTPUT:
77        err = snd_rawmidi_output_status(rfile->output, &status);
78        break;
79    case SNDRV_RAWMIDI_STREAM_INPUT:
80        err = snd_rawmidi_input_status(rfile->input, &status);
81        break;
82    default:
83        return -EINVAL;
84    }
85    if (err < 0)
86        return err;
87
88    if (put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) ||
89        put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) ||
90        put_user(status.avail, &src->avail) ||
91        put_user(status.xruns, &src->xruns))
92        return -EFAULT;
93
94    return 0;
95}
96
97enum {
98    SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
99    SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
100};
101
102static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
103{
104    struct snd_rawmidi_file *rfile;
105    void __user *argp = compat_ptr(arg);
106
107    rfile = file->private_data;
108    switch (cmd) {
109    case SNDRV_RAWMIDI_IOCTL_PVERSION:
110    case SNDRV_RAWMIDI_IOCTL_INFO:
111    case SNDRV_RAWMIDI_IOCTL_DROP:
112    case SNDRV_RAWMIDI_IOCTL_DRAIN:
113        return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
114    case SNDRV_RAWMIDI_IOCTL_PARAMS32:
115        return snd_rawmidi_ioctl_params_compat(rfile, argp);
116    case SNDRV_RAWMIDI_IOCTL_STATUS32:
117        return snd_rawmidi_ioctl_status_compat(rfile, argp);
118    }
119    return -ENOIOCTLCMD;
120}
121

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