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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* HWDEP Interface for HD-audio codec
*
* Copyright (c) 2007 Takashi Iwai <tiwai@suse.de>
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/compat.h>
#include <linux/nospec.h>
#include <sound/core.h>
#include <sound/hda_codec.h>
#include "hda_local.h"
#include <sound/hda_hwdep.h>
#include <sound/minors.h>
/*
* write/read an out-of-bound verb
*/
static int verb_write_ioctl(struct hda_codec *codec,
struct hda_verb_ioctl __user *arg)
{
u32 verb, res;
if (get_user(verb, &arg->verb))
return -EFAULT;
res = snd_hda_codec_read(codec, verb >> 24, 0,
(verb >> 8) & 0xffff, verb & 0xff);
if (put_user(res, &arg->res))
return -EFAULT;
return 0;
}
static int get_wcap_ioctl(struct hda_codec *codec,
struct hda_verb_ioctl __user *arg)
{
u32 verb, res;
if (get_user(verb, &arg->verb))
return -EFAULT;
/* open-code get_wcaps(verb>>24) with nospec */
verb >>= 24;
if (verb < codec->core.start_nid ||
verb >= codec->core.start_nid + codec->core.num_nodes) {
res = 0;
} else {
verb -= codec->core.start_nid;
verb = array_index_nospec(verb, codec->core.num_nodes);
res = codec->wcaps[verb];
}
if (put_user(res, &arg->res))
return -EFAULT;
return 0;
}
/*
*/
static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct hda_codec *codec = hw->private_data;
void __user *argp = (void __user *)arg;
switch (cmd) {
case HDA_IOCTL_PVERSION:
return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
case HDA_IOCTL_VERB_WRITE:
return verb_write_ioctl(codec, argp);
case HDA_IOCTL_GET_WCAP:
return get_wcap_ioctl(codec, argp);
}
return -ENOIOCTLCMD;
}
#ifdef CONFIG_COMPAT
static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
unsigned int cmd, unsigned long arg)
{
return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
}
#endif
static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
{
#ifndef CONFIG_SND_DEBUG_VERBOSE
if (!capable(CAP_SYS_RAWIO))
return -EACCES;
#endif
return 0;
}
int snd_hda_create_hwdep(struct hda_codec *codec)
{
char hwname[16];
struct snd_hwdep *hwdep;
int err;
sprintf(hwname, "HDA Codec %d", codec->addr);
err = snd_hwdep_new(codec->card, hwname, codec->addr, &hwdep);
if (err < 0)
return err;
codec->hwdep = hwdep;
sprintf(hwdep->name, "HDA Codec %d", codec->addr);
hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
hwdep->private_data = codec;
hwdep->exclusive = 1;
hwdep->ops.open = hda_hwdep_open;
hwdep->ops.ioctl = hda_hwdep_ioctl;
#ifdef CONFIG_COMPAT
hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
#endif
/* for sysfs */
hwdep->dev->groups = snd_hda_dev_attr_groups;
dev_set_drvdata(hwdep->dev, codec);
return 0;
}
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