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 <sound/core.h>
25#include "hda_codec.h"
26#include "hda_local.h"
27#include <sound/hda_hwdep.h>
28#include <sound/minors.h>
29
30/*
31 * write/read an out-of-bound verb
32 */
33static int verb_write_ioctl(struct hda_codec *codec,
34			    struct hda_verb_ioctl __user *arg)
35{
36	u32 verb, res;
37
38	if (get_user(verb, &arg->verb))
39		return -EFAULT;
40	res = snd_hda_codec_read(codec, verb >> 24, 0,
41				 (verb >> 8) & 0xffff, verb & 0xff);
42	if (put_user(res, &arg->res))
43		return -EFAULT;
44	return 0;
45}
46
47static int get_wcap_ioctl(struct hda_codec *codec,
48			  struct hda_verb_ioctl __user *arg)
49{
50	u32 verb, res;
51
52	if (get_user(verb, &arg->verb))
53		return -EFAULT;
54	res = get_wcaps(codec, verb >> 24);
55	if (put_user(res, &arg->res))
56		return -EFAULT;
57	return 0;
58}
59
60
61/*
62 */
63static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
64			   unsigned int cmd, unsigned long arg)
65{
66	struct hda_codec *codec = hw->private_data;
67	void __user *argp = (void __user *)arg;
68
69	switch (cmd) {
70	case HDA_IOCTL_PVERSION:
71		return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
72	case HDA_IOCTL_VERB_WRITE:
73		return verb_write_ioctl(codec, argp);
74	case HDA_IOCTL_GET_WCAP:
75		return get_wcap_ioctl(codec, argp);
76	}
77	return -ENOIOCTLCMD;
78}
79
80#ifdef CONFIG_COMPAT
81static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
82				  unsigned int cmd, unsigned long arg)
83{
84	return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
85}
86#endif
87
88static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
89{
90#ifndef CONFIG_SND_DEBUG_VERBOSE
91	if (!capable(CAP_SYS_RAWIO))
92		return -EACCES;
93#endif
94	return 0;
95}
96
97int snd_hda_create_hwdep(struct hda_codec *codec)
98{
99	char hwname[16];
100	struct snd_hwdep *hwdep;
101	int err;
102
103	sprintf(hwname, "HDA Codec %d", codec->addr);
104	err = snd_hwdep_new(codec->card, hwname, codec->addr, &hwdep);
105	if (err < 0)
106		return err;
107	codec->hwdep = hwdep;
108	sprintf(hwdep->name, "HDA Codec %d", codec->addr);
109	hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
110	hwdep->private_data = codec;
111	hwdep->exclusive = 1;
112
113	hwdep->ops.open = hda_hwdep_open;
114	hwdep->ops.ioctl = hda_hwdep_ioctl;
115#ifdef CONFIG_COMPAT
116	hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
117#endif
118
119	/* for sysfs */
120	hwdep->dev.groups = snd_hda_dev_attr_groups;
121	dev_set_drvdata(&hwdep->dev, codec);
122
123	return 0;
124}
125