1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * HWDEP Interface for HD-audio codec
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2007 Takashi Iwai <tiwai@suse.de>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/init.h>
9*4882a593Smuzhiyun #include <linux/slab.h>
10*4882a593Smuzhiyun #include <linux/compat.h>
11*4882a593Smuzhiyun #include <linux/nospec.h>
12*4882a593Smuzhiyun #include <sound/core.h>
13*4882a593Smuzhiyun #include <sound/hda_codec.h>
14*4882a593Smuzhiyun #include "hda_local.h"
15*4882a593Smuzhiyun #include <sound/hda_hwdep.h>
16*4882a593Smuzhiyun #include <sound/minors.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun /*
19*4882a593Smuzhiyun * write/read an out-of-bound verb
20*4882a593Smuzhiyun */
verb_write_ioctl(struct hda_codec * codec,struct hda_verb_ioctl __user * arg)21*4882a593Smuzhiyun static int verb_write_ioctl(struct hda_codec *codec,
22*4882a593Smuzhiyun struct hda_verb_ioctl __user *arg)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun u32 verb, res;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun if (get_user(verb, &arg->verb))
27*4882a593Smuzhiyun return -EFAULT;
28*4882a593Smuzhiyun res = snd_hda_codec_read(codec, verb >> 24, 0,
29*4882a593Smuzhiyun (verb >> 8) & 0xffff, verb & 0xff);
30*4882a593Smuzhiyun if (put_user(res, &arg->res))
31*4882a593Smuzhiyun return -EFAULT;
32*4882a593Smuzhiyun return 0;
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
get_wcap_ioctl(struct hda_codec * codec,struct hda_verb_ioctl __user * arg)35*4882a593Smuzhiyun static int get_wcap_ioctl(struct hda_codec *codec,
36*4882a593Smuzhiyun struct hda_verb_ioctl __user *arg)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun u32 verb, res;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun if (get_user(verb, &arg->verb))
41*4882a593Smuzhiyun return -EFAULT;
42*4882a593Smuzhiyun /* open-code get_wcaps(verb>>24) with nospec */
43*4882a593Smuzhiyun verb >>= 24;
44*4882a593Smuzhiyun if (verb < codec->core.start_nid ||
45*4882a593Smuzhiyun verb >= codec->core.start_nid + codec->core.num_nodes) {
46*4882a593Smuzhiyun res = 0;
47*4882a593Smuzhiyun } else {
48*4882a593Smuzhiyun verb -= codec->core.start_nid;
49*4882a593Smuzhiyun verb = array_index_nospec(verb, codec->core.num_nodes);
50*4882a593Smuzhiyun res = codec->wcaps[verb];
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun if (put_user(res, &arg->res))
53*4882a593Smuzhiyun return -EFAULT;
54*4882a593Smuzhiyun return 0;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun /*
59*4882a593Smuzhiyun */
hda_hwdep_ioctl(struct snd_hwdep * hw,struct file * file,unsigned int cmd,unsigned long arg)60*4882a593Smuzhiyun static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
61*4882a593Smuzhiyun unsigned int cmd, unsigned long arg)
62*4882a593Smuzhiyun {
63*4882a593Smuzhiyun struct hda_codec *codec = hw->private_data;
64*4882a593Smuzhiyun void __user *argp = (void __user *)arg;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun switch (cmd) {
67*4882a593Smuzhiyun case HDA_IOCTL_PVERSION:
68*4882a593Smuzhiyun return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
69*4882a593Smuzhiyun case HDA_IOCTL_VERB_WRITE:
70*4882a593Smuzhiyun return verb_write_ioctl(codec, argp);
71*4882a593Smuzhiyun case HDA_IOCTL_GET_WCAP:
72*4882a593Smuzhiyun return get_wcap_ioctl(codec, argp);
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun return -ENOIOCTLCMD;
75*4882a593Smuzhiyun }
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun #ifdef CONFIG_COMPAT
hda_hwdep_ioctl_compat(struct snd_hwdep * hw,struct file * file,unsigned int cmd,unsigned long arg)78*4882a593Smuzhiyun static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
79*4882a593Smuzhiyun unsigned int cmd, unsigned long arg)
80*4882a593Smuzhiyun {
81*4882a593Smuzhiyun return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun #endif
84*4882a593Smuzhiyun
hda_hwdep_open(struct snd_hwdep * hw,struct file * file)85*4882a593Smuzhiyun static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
86*4882a593Smuzhiyun {
87*4882a593Smuzhiyun #ifndef CONFIG_SND_DEBUG_VERBOSE
88*4882a593Smuzhiyun if (!capable(CAP_SYS_RAWIO))
89*4882a593Smuzhiyun return -EACCES;
90*4882a593Smuzhiyun #endif
91*4882a593Smuzhiyun return 0;
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
snd_hda_create_hwdep(struct hda_codec * codec)94*4882a593Smuzhiyun int snd_hda_create_hwdep(struct hda_codec *codec)
95*4882a593Smuzhiyun {
96*4882a593Smuzhiyun char hwname[16];
97*4882a593Smuzhiyun struct snd_hwdep *hwdep;
98*4882a593Smuzhiyun int err;
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun sprintf(hwname, "HDA Codec %d", codec->addr);
101*4882a593Smuzhiyun err = snd_hwdep_new(codec->card, hwname, codec->addr, &hwdep);
102*4882a593Smuzhiyun if (err < 0)
103*4882a593Smuzhiyun return err;
104*4882a593Smuzhiyun codec->hwdep = hwdep;
105*4882a593Smuzhiyun sprintf(hwdep->name, "HDA Codec %d", codec->addr);
106*4882a593Smuzhiyun hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
107*4882a593Smuzhiyun hwdep->private_data = codec;
108*4882a593Smuzhiyun hwdep->exclusive = 1;
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun hwdep->ops.open = hda_hwdep_open;
111*4882a593Smuzhiyun hwdep->ops.ioctl = hda_hwdep_ioctl;
112*4882a593Smuzhiyun #ifdef CONFIG_COMPAT
113*4882a593Smuzhiyun hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
114*4882a593Smuzhiyun #endif
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun /* for sysfs */
117*4882a593Smuzhiyun hwdep->dev.groups = snd_hda_dev_attr_groups;
118*4882a593Smuzhiyun dev_set_drvdata(&hwdep->dev, codec);
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun return 0;
121*4882a593Smuzhiyun }
122