// 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;
|
}
|
