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// SPDX-License-Identifier: GPL-2.0
/*
* AVIRT - ALSA Virtual Soundcard
*
* Copyright (c) 2010-2018 Fiberdyne Systems Pty Ltd
*
* configfs.c - AVIRT configfs support
*/
#include <linux/slab.h>
#include "core.h"
#define D_LOGNAME "configfs"
#define D_INFOK(fmt, args...) DINFO(D_LOGNAME, fmt, ##args)
#define D_PRINTK(fmt, args...) DDEBUG(D_LOGNAME, fmt, ##args)
#define D_ERRORK(fmt, args...) DERROR(D_LOGNAME, fmt, ##args)
static ssize_t cfg_avirt_stream_direction_show(struct config_item *item,
char *page)
{
ssize_t count;
struct avirt_stream *stream = avirt_stream_from_config_item(item);
count = sprintf(page, "%d\n", stream->direction);
return count;
}
CONFIGFS_ATTR_RO(cfg_avirt_stream_, direction);
static ssize_t cfg_avirt_stream_map_show(struct config_item *item, char *page)
{
struct avirt_stream *stream = avirt_stream_from_config_item(item);
return sprintf(page, "%s\n", stream->map);
}
static ssize_t cfg_avirt_stream_map_store(struct config_item *item,
const char *page, size_t count)
{
char *split;
struct avirt_stream *stream = avirt_stream_from_config_item(item);
split = strsep((char **)&page, "\n");
memcpy(stream->map, (char *)split, count);
return count;
}
CONFIGFS_ATTR(cfg_avirt_stream_, map);
static ssize_t cfg_avirt_stream_channels_show(struct config_item *item,
char *page)
{
ssize_t count;
struct avirt_stream *stream = avirt_stream_from_config_item(item);
count = sprintf(page, "%d\n", stream->channels);
return count;
}
static ssize_t cfg_avirt_stream_channels_store(struct config_item *item,
const char *page, size_t count)
{
int err;
struct avirt_stream *stream = avirt_stream_from_config_item(item);
unsigned long tmp;
char *p = (char *)page;
err = kstrtoul(p, 10, &tmp);
if (err < 0)
return err;
if (tmp > INT_MAX)
return -ERANGE;
stream->channels = tmp;
return count;
}
CONFIGFS_ATTR(cfg_avirt_stream_, channels);
static struct configfs_attribute *cfg_avirt_stream_attrs[] = {
&cfg_avirt_stream_attr_channels,
&cfg_avirt_stream_attr_map,
&cfg_avirt_stream_attr_direction,
NULL,
};
static void cfg_avirt_stream_release(struct config_item *item)
{
D_INFOK("item->name:%s", item->ci_namebuf);
kfree(avirt_stream_from_config_item(item));
}
static struct configfs_item_operations cfg_avirt_stream_ops = {
.release = cfg_avirt_stream_release,
};
static struct config_item_type cfg_avirt_stream_type = {
.ct_item_ops = &cfg_avirt_stream_ops,
.ct_attrs = cfg_avirt_stream_attrs,
.ct_owner = THIS_MODULE,
};
static struct config_item *
cfg_avirt_stream_make_item(struct config_group *group, const char *name)
{
char *split;
int direction;
struct avirt_stream *stream;
// Get prefix (playback_ or capture_)
split = strsep((char **)&name, "_");
if (!split) {
D_ERRORK("Stream name: '%s' invalid!", split);
D_ERRORK("Must begin with playback_ * or capture_ *");
return ERR_PTR(-EINVAL);
}
if (!strcmp(split, "playback")) {
direction = SNDRV_PCM_STREAM_PLAYBACK;
} else if (!strcmp(split, "capture")) {
direction = SNDRV_PCM_STREAM_CAPTURE;
} else {
D_ERRORK("Stream name: '%s' invalid!", split);
D_ERRORK("Must begin with playback_ * or capture_ ");
return ERR_PTR(-EINVAL);
}
// Get stream name, and create PCM for stream
split = strsep((char **)&name, "\n");
stream = __avirt_stream_create(split, direction);
if (IS_ERR(stream))
return ERR_PTR(PTR_ERR(stream));
config_item_init_type_name(&stream->item, name, &cfg_avirt_stream_type);
return &stream->item;
}
static ssize_t cfg_avirt_stream_group_sealed_show(struct config_item *item,
char *page)
{
return snprintf(page, PAGE_SIZE, "%d\n", __avirt_streams_sealed());
}
static ssize_t cfg_avirt_stream_group_sealed_store(struct config_item *item,
const char *page,
size_t count)
{
unsigned long tmp;
char *p = (char *)page;
CHK_ERR(kstrtoul(p, 10, &tmp));
if (tmp != 1) {
D_ERRORK("streams can only be sealed, not unsealed!");
return -ERANGE;
}
__avirt_streams_seal();
return count;
}
CONFIGFS_ATTR(cfg_avirt_stream_group_, sealed);
static struct configfs_attribute *cfg_avirt_stream_group_attrs[] = {
&cfg_avirt_stream_group_attr_sealed,
NULL,
};
static struct configfs_group_operations cfg_avirt_stream_group_ops = {
.make_item = cfg_avirt_stream_make_item
};
static struct config_item_type cfg_stream_group_type = {
.ct_group_ops = &cfg_avirt_stream_group_ops,
.ct_attrs = cfg_avirt_stream_group_attrs,
.ct_owner = THIS_MODULE
};
static struct config_item_type cfg_avirt_group_type = {
.ct_owner = THIS_MODULE,
};
static struct configfs_subsystem cfg_subsys = {
.su_group =
{
.cg_item =
{
.ci_namebuf = "avirt",
.ci_type = &cfg_avirt_group_type,
},
},
};
int __init __avirt_configfs_init(struct avirt_core *core)
{
int err;
config_group_init(&cfg_subsys.su_group);
mutex_init(&cfg_subsys.su_mutex);
err = configfs_register_subsystem(&cfg_subsys);
if (err) {
D_ERRORK("Cannot register configfs subsys!");
return err;
}
core->stream_group = configfs_register_default_group(
&cfg_subsys.su_group, "streams", &cfg_stream_group_type);
if (IS_ERR(core->stream_group)) {
err = PTR_ERR(core->stream_group);
D_ERRORK("Cannot register configfs default group 'streams'!");
goto exit_configfs;
}
return 0;
exit_configfs:
configfs_unregister_subsystem(&cfg_subsys);
return err;
}
void __exit __avirt_configfs_exit(struct avirt_core *core)
{
configfs_unregister_default_group(core->stream_group);
configfs_unregister_subsystem(&cfg_subsys);
}
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