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 */
21static 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, nid: verb >> 24, flags: 0,
29 verb: (verb >> 8) & 0xffff, parm: verb & 0xff);
30 if (put_user(res, &arg->res))
31 return -EFAULT;
32 return 0;
33}
34
35static 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 */
60static 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, arg: argp);
71 case HDA_IOCTL_GET_WCAP:
72 return get_wcap_ioctl(codec, arg: argp);
73 }
74 return -ENOIOCTLCMD;
75}
76
77#ifdef CONFIG_COMPAT
78static 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, arg: (unsigned long)compat_ptr(uptr: arg));
82}
83#endif
84
85static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
86{
87 if (!capable(CAP_SYS_RAWIO))
88 return -EACCES;
89 return 0;
90}
91
92int snd_hda_create_hwdep(struct hda_codec *codec)
93{
94 char hwname[16];
95 struct snd_hwdep *hwdep;
96 int err;
97
98 sprintf(buf: hwname, fmt: "HDA Codec %d", codec->addr);
99 err = snd_hwdep_new(card: codec->card, id: hwname, device: codec->addr, rhwdep: &hwdep);
100 if (err < 0)
101 return err;
102 codec->hwdep = hwdep;
103 sprintf(buf: hwdep->name, fmt: "HDA Codec %d", codec->addr);
104 hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
105 hwdep->private_data = codec;
106 hwdep->exclusive = 1;
107
108 hwdep->ops.open = hda_hwdep_open;
109 hwdep->ops.ioctl = hda_hwdep_ioctl;
110#ifdef CONFIG_COMPAT
111 hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
112#endif
113
114 /* for sysfs */
115 hwdep->dev->groups = snd_hda_dev_attr_groups;
116 dev_set_drvdata(dev: hwdep->dev, data: codec);
117
118 return 0;
119}
120

source code of linux/sound/hda/common/hwdep.c