linux/sound/pci/hda/hda_hwdep.c
Thomas Gleixner d0fa1179e3 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 32
Based on 1 normalized pattern(s):

  this driver is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this driver is distributed in the hope
  that it will be useful but without any warranty without even the
  implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 18 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520170857.186505395@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-24 17:27:10 +02:00

122 lines
2.7 KiB
C

// 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;
}