1 /*
2 * HWDEP Interface for HD-audio codec
3 *
4 * Copyright (c) 2007 Takashi Iwai <tiwai@suse.de>
5 *
6 * This driver is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This driver is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/init.h>
22 #include <linux/slab.h>
23 #include <linux/compat.h>
24 #include <linux/nospec.h>
25 #include <sound/core.h>
26 #include "hda_codec.h"
27 #include "hda_local.h"
28 #include <sound/hda_hwdep.h>
29 #include <sound/minors.h>
30
31 /*
32 * write/read an out-of-bound verb
33 */
verb_write_ioctl(struct hda_codec * codec,struct hda_verb_ioctl __user * arg)34 static int verb_write_ioctl(struct hda_codec *codec,
35 struct hda_verb_ioctl __user *arg)
36 {
37 u32 verb, res;
38
39 if (get_user(verb, &arg->verb))
40 return -EFAULT;
41 res = snd_hda_codec_read(codec, verb >> 24, 0,
42 (verb >> 8) & 0xffff, verb & 0xff);
43 if (put_user(res, &arg->res))
44 return -EFAULT;
45 return 0;
46 }
47
get_wcap_ioctl(struct hda_codec * codec,struct hda_verb_ioctl __user * arg)48 static int get_wcap_ioctl(struct hda_codec *codec,
49 struct hda_verb_ioctl __user *arg)
50 {
51 u32 verb, res;
52
53 if (get_user(verb, &arg->verb))
54 return -EFAULT;
55 /* open-code get_wcaps(verb>>24) with nospec */
56 verb >>= 24;
57 if (verb < codec->core.start_nid ||
58 verb >= codec->core.start_nid + codec->core.num_nodes) {
59 res = 0;
60 } else {
61 verb -= codec->core.start_nid;
62 verb = array_index_nospec(verb, codec->core.num_nodes);
63 res = codec->wcaps[verb];
64 }
65 if (put_user(res, &arg->res))
66 return -EFAULT;
67 return 0;
68 }
69
70
71 /*
72 */
hda_hwdep_ioctl(struct snd_hwdep * hw,struct file * file,unsigned int cmd,unsigned long arg)73 static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
74 unsigned int cmd, unsigned long arg)
75 {
76 struct hda_codec *codec = hw->private_data;
77 void __user *argp = (void __user *)arg;
78
79 switch (cmd) {
80 case HDA_IOCTL_PVERSION:
81 return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
82 case HDA_IOCTL_VERB_WRITE:
83 return verb_write_ioctl(codec, argp);
84 case HDA_IOCTL_GET_WCAP:
85 return get_wcap_ioctl(codec, argp);
86 }
87 return -ENOIOCTLCMD;
88 }
89
90 #ifdef CONFIG_COMPAT
hda_hwdep_ioctl_compat(struct snd_hwdep * hw,struct file * file,unsigned int cmd,unsigned long arg)91 static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
92 unsigned int cmd, unsigned long arg)
93 {
94 return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
95 }
96 #endif
97
hda_hwdep_open(struct snd_hwdep * hw,struct file * file)98 static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
99 {
100 #ifndef CONFIG_SND_DEBUG_VERBOSE
101 if (!capable(CAP_SYS_RAWIO))
102 return -EACCES;
103 #endif
104 return 0;
105 }
106
snd_hda_create_hwdep(struct hda_codec * codec)107 int snd_hda_create_hwdep(struct hda_codec *codec)
108 {
109 char hwname[16];
110 struct snd_hwdep *hwdep;
111 int err;
112
113 sprintf(hwname, "HDA Codec %d", codec->addr);
114 err = snd_hwdep_new(codec->card, hwname, codec->addr, &hwdep);
115 if (err < 0)
116 return err;
117 codec->hwdep = hwdep;
118 sprintf(hwdep->name, "HDA Codec %d", codec->addr);
119 hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
120 hwdep->private_data = codec;
121 hwdep->exclusive = 1;
122
123 hwdep->ops.open = hda_hwdep_open;
124 hwdep->ops.ioctl = hda_hwdep_ioctl;
125 #ifdef CONFIG_COMPAT
126 hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
127 #endif
128
129 /* for sysfs */
130 hwdep->dev.groups = snd_hda_dev_attr_groups;
131 dev_set_drvdata(&hwdep->dev, codec);
132
133 return 0;
134 }
135