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 }
122
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