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