1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *   32bit -> 64bit ioctl wrapper for timer API
4 *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
5 */
6
7/* This file included from timer.c */
8
9#include <linux/compat.h>
10
11/*
12 * ILP32/LP64 has different size for 'long' type. Additionally, the size
13 * of storage alignment differs depending on architectures. Here, '__packed'
14 * qualifier is used so that the size of this structure is multiple of 4 and
15 * it fits to any architectures with 32 bit storage alignment.
16 */
17struct snd_timer_gparams32 {
18	struct snd_timer_id tid;
19	u32 period_num;
20	u32 period_den;
21	unsigned char reserved[32];
22} __packed;
23
24struct snd_timer_info32 {
25	u32 flags;
26	s32 card;
27	unsigned char id[64];
28	unsigned char name[80];
29	u32 reserved0;
30	u32 resolution;
31	unsigned char reserved[64];
32};
33
34static int snd_timer_user_gparams_compat(struct file *file,
35					struct snd_timer_gparams32 __user *user)
36{
37	struct snd_timer_gparams gparams;
38
39	if (copy_from_user(&gparams.tid, &user->tid, sizeof(gparams.tid)) ||
40	    get_user(gparams.period_num, &user->period_num) ||
41	    get_user(gparams.period_den, &user->period_den))
42		return -EFAULT;
43
44	return timer_set_gparams(&gparams);
45}
46
47static int snd_timer_user_info_compat(struct file *file,
48				      struct snd_timer_info32 __user *_info)
49{
50	struct snd_timer_user *tu;
51	struct snd_timer_info32 info;
52	struct snd_timer *t;
53
54	tu = file->private_data;
55	if (!tu->timeri)
56		return -EBADFD;
57	t = tu->timeri->timer;
58	if (!t)
59		return -EBADFD;
60	memset(&info, 0, sizeof(info));
61	info.card = t->card ? t->card->number : -1;
62	if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
63		info.flags |= SNDRV_TIMER_FLG_SLAVE;
64	strscpy(info.id, t->id, sizeof(info.id));
65	strscpy(info.name, t->name, sizeof(info.name));
66	info.resolution = t->hw.resolution;
67	if (copy_to_user(_info, &info, sizeof(*_info)))
68		return -EFAULT;
69	return 0;
70}
71
72enum {
73	SNDRV_TIMER_IOCTL_GPARAMS32 = _IOW('T', 0x04, struct snd_timer_gparams32),
74	SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32),
75	SNDRV_TIMER_IOCTL_STATUS_COMPAT32 = _IOW('T', 0x14, struct snd_timer_status32),
76	SNDRV_TIMER_IOCTL_STATUS_COMPAT64 = _IOW('T', 0x14, struct snd_timer_status64),
77};
78
79static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
80					  unsigned long arg)
81{
82	void __user *argp = compat_ptr(arg);
83
84	switch (cmd) {
85	case SNDRV_TIMER_IOCTL_PVERSION:
86	case SNDRV_TIMER_IOCTL_TREAD_OLD:
87	case SNDRV_TIMER_IOCTL_TREAD64:
88	case SNDRV_TIMER_IOCTL_GINFO:
89	case SNDRV_TIMER_IOCTL_GSTATUS:
90	case SNDRV_TIMER_IOCTL_SELECT:
91	case SNDRV_TIMER_IOCTL_PARAMS:
92	case SNDRV_TIMER_IOCTL_START:
93	case SNDRV_TIMER_IOCTL_START_OLD:
94	case SNDRV_TIMER_IOCTL_STOP:
95	case SNDRV_TIMER_IOCTL_STOP_OLD:
96	case SNDRV_TIMER_IOCTL_CONTINUE:
97	case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
98	case SNDRV_TIMER_IOCTL_PAUSE:
99	case SNDRV_TIMER_IOCTL_PAUSE_OLD:
100	case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
101		return __snd_timer_user_ioctl(file, cmd, (unsigned long)argp, true);
102	case SNDRV_TIMER_IOCTL_GPARAMS32:
103		return snd_timer_user_gparams_compat(file, argp);
104	case SNDRV_TIMER_IOCTL_INFO32:
105		return snd_timer_user_info_compat(file, argp);
106	case SNDRV_TIMER_IOCTL_STATUS_COMPAT32:
107		return snd_timer_user_status32(file, argp);
108	case SNDRV_TIMER_IOCTL_STATUS_COMPAT64:
109		return snd_timer_user_status64(file, argp);
110	}
111	return -ENOIOCTLCMD;
112}
113
114static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
115					unsigned long arg)
116{
117	struct snd_timer_user *tu = file->private_data;
118
119	guard(mutex)(&tu->ioctl_lock);
120	return __snd_timer_user_ioctl_compat(file, cmd, arg);
121}
122