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
97#ifdef CONFIG_X86_X32
98/* X32 ABI has 64bit timespec and 64bit alignment */
99struct snd_rawmidi_status_x32 {
100	s32 stream;
101	u32 rsvd; /* alignment */
102	struct timespec tstamp;
103	u32 avail;
104	u32 xruns;
105	unsigned char reserved[16];
106} __attribute__((packed));
107
108#define put_timespec(src, dst) copy_to_user(dst, src, sizeof(*dst))
109
110static int snd_rawmidi_ioctl_status_x32(struct snd_rawmidi_file *rfile,
111					struct snd_rawmidi_status_x32 __user *src)
112{
113	int err;
114	struct snd_rawmidi_status status;
115
116	if (rfile->output == NULL)
117		return -EINVAL;
118	if (get_user(status.stream, &src->stream))
119		return -EFAULT;
120
121	switch (status.stream) {
122	case SNDRV_RAWMIDI_STREAM_OUTPUT:
123		err = snd_rawmidi_output_status(rfile->output, &status);
124		break;
125	case SNDRV_RAWMIDI_STREAM_INPUT:
126		err = snd_rawmidi_input_status(rfile->input, &status);
127		break;
128	default:
129		return -EINVAL;
130	}
131	if (err < 0)
132		return err;
133
134	if (put_timespec(&status.tstamp, &src->tstamp) ||
135	    put_user(status.avail, &src->avail) ||
136	    put_user(status.xruns, &src->xruns))
137		return -EFAULT;
138
139	return 0;
140}
141#endif /* CONFIG_X86_X32 */
142
143enum {
144	SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
145	SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
146#ifdef CONFIG_X86_X32
147	SNDRV_RAWMIDI_IOCTL_STATUS_X32 = _IOWR('W', 0x20, struct snd_rawmidi_status_x32),
148#endif /* CONFIG_X86_X32 */
149};
150
151static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
152{
153	struct snd_rawmidi_file *rfile;
154	void __user *argp = compat_ptr(arg);
155
156	rfile = file->private_data;
157	switch (cmd) {
158	case SNDRV_RAWMIDI_IOCTL_PVERSION:
159	case SNDRV_RAWMIDI_IOCTL_INFO:
160	case SNDRV_RAWMIDI_IOCTL_DROP:
161	case SNDRV_RAWMIDI_IOCTL_DRAIN:
162		return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
163	case SNDRV_RAWMIDI_IOCTL_PARAMS32:
164		return snd_rawmidi_ioctl_params_compat(rfile, argp);
165	case SNDRV_RAWMIDI_IOCTL_STATUS32:
166		return snd_rawmidi_ioctl_status_compat(rfile, argp);
167#ifdef CONFIG_X86_X32
168	case SNDRV_RAWMIDI_IOCTL_STATUS_X32:
169		return snd_rawmidi_ioctl_status_x32(rfile, argp);
170#endif /* CONFIG_X86_X32 */
171	}
172	return -ENOIOCTLCMD;
173}
174