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 */
17 struct 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
24 struct 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
34 static 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
47 static 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
72 enum {
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
79 static 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
114 static 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
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