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(to: &gparams.tid, from: &user->tid, n: 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: &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(s: &info, c: 0, n: 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(to: _info, from: &info, n: 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(uptr: 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, arg: (unsigned long)argp, compat: true);
102 case SNDRV_TIMER_IOCTL_GPARAMS32:
103 return snd_timer_user_gparams_compat(file, user: argp);
104 case SNDRV_TIMER_IOCTL_INFO32:
105 return snd_timer_user_info_compat(file, info: argp);
106 case SNDRV_TIMER_IOCTL_STATUS_COMPAT32:
107 return snd_timer_user_status32(file, status: argp);
108 case SNDRV_TIMER_IOCTL_STATUS_COMPAT64:
109 return snd_timer_user_status64(file, status: 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)(T: &tu->ioctl_lock);
120 return __snd_timer_user_ioctl_compat(file, cmd, arg);
121}
122