Merge tag 'afs-fixes-20220802' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowe...
[linux-2.6-microblaze.git] / sound / pci / hda / hda_hwdep.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * HWDEP Interface for HD-audio codec
4  *
5  * Copyright (c) 2007 Takashi Iwai <tiwai@suse.de>
6  */
7
8 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/compat.h>
11 #include <linux/nospec.h>
12 #include <sound/core.h>
13 #include <sound/hda_codec.h>
14 #include "hda_local.h"
15 #include <sound/hda_hwdep.h>
16 #include <sound/minors.h>
17
18 /*
19  * write/read an out-of-bound verb
20  */
21 static int verb_write_ioctl(struct hda_codec *codec,
22                             struct hda_verb_ioctl __user *arg)
23 {
24         u32 verb, res;
25
26         if (get_user(verb, &arg->verb))
27                 return -EFAULT;
28         res = snd_hda_codec_read(codec, verb >> 24, 0,
29                                  (verb >> 8) & 0xffff, verb & 0xff);
30         if (put_user(res, &arg->res))
31                 return -EFAULT;
32         return 0;
33 }
34
35 static int get_wcap_ioctl(struct hda_codec *codec,
36                           struct hda_verb_ioctl __user *arg)
37 {
38         u32 verb, res;
39         
40         if (get_user(verb, &arg->verb))
41                 return -EFAULT;
42         /* open-code get_wcaps(verb>>24) with nospec */
43         verb >>= 24;
44         if (verb < codec->core.start_nid ||
45             verb >= codec->core.start_nid + codec->core.num_nodes) {
46                 res = 0;
47         } else {
48                 verb -= codec->core.start_nid;
49                 verb = array_index_nospec(verb, codec->core.num_nodes);
50                 res = codec->wcaps[verb];
51         }
52         if (put_user(res, &arg->res))
53                 return -EFAULT;
54         return 0;
55 }
56
57
58 /*
59  */
60 static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
61                            unsigned int cmd, unsigned long arg)
62 {
63         struct hda_codec *codec = hw->private_data;
64         void __user *argp = (void __user *)arg;
65
66         switch (cmd) {
67         case HDA_IOCTL_PVERSION:
68                 return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
69         case HDA_IOCTL_VERB_WRITE:
70                 return verb_write_ioctl(codec, argp);
71         case HDA_IOCTL_GET_WCAP:
72                 return get_wcap_ioctl(codec, argp);
73         }
74         return -ENOIOCTLCMD;
75 }
76
77 #ifdef CONFIG_COMPAT
78 static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
79                                   unsigned int cmd, unsigned long arg)
80 {
81         return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
82 }
83 #endif
84
85 static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
86 {
87 #ifndef CONFIG_SND_DEBUG_VERBOSE
88         if (!capable(CAP_SYS_RAWIO))
89                 return -EACCES;
90 #endif
91         return 0;
92 }
93
94 int snd_hda_create_hwdep(struct hda_codec *codec)
95 {
96         char hwname[16];
97         struct snd_hwdep *hwdep;
98         int err;
99
100         sprintf(hwname, "HDA Codec %d", codec->addr);
101         err = snd_hwdep_new(codec->card, hwname, codec->addr, &hwdep);
102         if (err < 0)
103                 return err;
104         codec->hwdep = hwdep;
105         sprintf(hwdep->name, "HDA Codec %d", codec->addr);
106         hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
107         hwdep->private_data = codec;
108         hwdep->exclusive = 1;
109
110         hwdep->ops.open = hda_hwdep_open;
111         hwdep->ops.ioctl = hda_hwdep_ioctl;
112 #ifdef CONFIG_COMPAT
113         hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
114 #endif
115
116         /* for sysfs */
117         hwdep->dev.groups = snd_hda_dev_attr_groups;
118         dev_set_drvdata(&hwdep->dev, codec);
119
120         return 0;
121 }