treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
[sfrench/cifs-2.6.git] / sound / core / hwdep_compat.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *   32bit -> 64bit ioctl wrapper for hwdep API
4  *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
5  */
6
7 /* This file is included from hwdep.c */
8
9 #include <linux/compat.h>
10
11 struct snd_hwdep_dsp_image32 {
12         u32 index;
13         unsigned char name[64];
14         u32 image;      /* pointer */
15         u32 length;
16         u32 driver_data;
17 } /* don't set packed attribute here */;
18
19 static int snd_hwdep_dsp_load_compat(struct snd_hwdep *hw,
20                                      struct snd_hwdep_dsp_image32 __user *src)
21 {
22         struct snd_hwdep_dsp_image __user *dst;
23         compat_caddr_t ptr;
24         u32 val;
25
26         dst = compat_alloc_user_space(sizeof(*dst));
27
28         /* index and name */
29         if (copy_in_user(dst, src, 4 + 64))
30                 return -EFAULT;
31         if (get_user(ptr, &src->image) ||
32             put_user(compat_ptr(ptr), &dst->image))
33                 return -EFAULT;
34         if (get_user(val, &src->length) ||
35             put_user(val, &dst->length))
36                 return -EFAULT;
37         if (get_user(val, &src->driver_data) ||
38             put_user(val, &dst->driver_data))
39                 return -EFAULT;
40
41         return snd_hwdep_dsp_load(hw, dst);
42 }
43
44 enum {
45         SNDRV_HWDEP_IOCTL_DSP_LOAD32   = _IOW('H', 0x03, struct snd_hwdep_dsp_image32)
46 };
47
48 static long snd_hwdep_ioctl_compat(struct file * file, unsigned int cmd,
49                                    unsigned long arg)
50 {
51         struct snd_hwdep *hw = file->private_data;
52         void __user *argp = compat_ptr(arg);
53         switch (cmd) {
54         case SNDRV_HWDEP_IOCTL_PVERSION:
55         case SNDRV_HWDEP_IOCTL_INFO:
56         case SNDRV_HWDEP_IOCTL_DSP_STATUS:
57                 return snd_hwdep_ioctl(file, cmd, (unsigned long)argp);
58         case SNDRV_HWDEP_IOCTL_DSP_LOAD32:
59                 return snd_hwdep_dsp_load_compat(hw, argp);
60         }
61         if (hw->ops.ioctl_compat)
62                 return hw->ops.ioctl_compat(hw, file, cmd, arg);
63         return -ENOIOCTLCMD;
64 }