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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /sound/pci/hda/hda_hwdep.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sound/pci/hda/hda_hwdep.c')
-rw-r--r-- | sound/pci/hda/hda_hwdep.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_hwdep.c b/sound/pci/hda/hda_hwdep.c new file mode 100644 index 000000000..125e97fe0 --- /dev/null +++ b/sound/pci/hda/hda_hwdep.c @@ -0,0 +1,121 @@ +// 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; +} |