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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * 32bit -> 64bit ioctl wrapper for timer API
4 * Copyright (c) by Takashi Iwai <[email protected]>
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
53 tu = file->private_data;
54 if (!tu->timeri)
55 return -EBADFD;
56
57 struct snd_timer *t __free(snd_timeri_timer) =
58 snd_timeri_timer_get(tu->timeri);
59 if (!t)
60 return -EBADFD;
61 memset(&info, 0, sizeof(info));
62 info.card = t->card ? t->card->number : -1;
63 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
64 info.flags |= SNDRV_TIMER_FLG_SLAVE;
65 strscpy(info.id, t->id, sizeof(info.id));
66 strscpy(info.name, t->name, sizeof(info.name));
67 info.resolution = t->hw.resolution;
68 if (copy_to_user(_info, &info, sizeof(*_info)))
69 return -EFAULT;
70 return 0;
71}
72
73enum {
74 SNDRV_TIMER_IOCTL_GPARAMS32 = _IOW('T', 0x04, struct snd_timer_gparams32),
75 SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32),
76 SNDRV_TIMER_IOCTL_STATUS_COMPAT32 = _IOW('T', 0x14, struct snd_timer_status32),
77 SNDRV_TIMER_IOCTL_STATUS_COMPAT64 = _IOW('T', 0x14, struct snd_timer_status64),
78};
79
80static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
81 unsigned long arg)
82{
83 void __user *argp = compat_ptr(arg);
84
85 switch (cmd) {
86 case SNDRV_TIMER_IOCTL_PVERSION:
87 case SNDRV_TIMER_IOCTL_TREAD_OLD:
88 case SNDRV_TIMER_IOCTL_TREAD64:
89 case SNDRV_TIMER_IOCTL_GINFO:
90 case SNDRV_TIMER_IOCTL_GSTATUS:
91 case SNDRV_TIMER_IOCTL_SELECT:
92 case SNDRV_TIMER_IOCTL_PARAMS:
93 case SNDRV_TIMER_IOCTL_START:
94 case SNDRV_TIMER_IOCTL_START_OLD:
95 case SNDRV_TIMER_IOCTL_STOP:
96 case SNDRV_TIMER_IOCTL_STOP_OLD:
97 case SNDRV_TIMER_IOCTL_CONTINUE:
98 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
99 case SNDRV_TIMER_IOCTL_PAUSE:
100 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
101 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
102 return __snd_timer_user_ioctl(file, cmd, (unsigned long)argp, true);
103 case SNDRV_TIMER_IOCTL_GPARAMS32:
104 return snd_timer_user_gparams_compat(file, argp);
105 case SNDRV_TIMER_IOCTL_INFO32:
106 return snd_timer_user_info_compat(file, argp);
107 case SNDRV_TIMER_IOCTL_STATUS_COMPAT32:
108 return snd_timer_user_status32(file, argp);
109 case SNDRV_TIMER_IOCTL_STATUS_COMPAT64:
110 return snd_timer_user_status64(file, argp);
111 }
112 return -ENOIOCTLCMD;
113}
114
115static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
116 unsigned long arg)
117{
118 struct snd_timer_user *tu = file->private_data;
119
120 guard(mutex)(&tu->ioctl_lock);
121 return __snd_timer_user_ioctl_compat(file, cmd, arg);
122}