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-rw-r--r--configfs.c235
1 files changed, 235 insertions, 0 deletions
diff --git a/configfs.c b/configfs.c
new file mode 100644
index 0000000..12e95a5
--- /dev/null
+++ b/configfs.c
@@ -0,0 +1,235 @@
+// 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_snd_avirt_stream_direction_show(struct config_item *item,
+ char *page)
+{
+ ssize_t count;
+ struct snd_avirt_stream *stream =
+ snd_avirt_stream_from_config_item(item);
+
+ count = sprintf(page, "%d\n", stream->direction);
+
+ return count;
+}
+CONFIGFS_ATTR_RO(cfg_snd_avirt_stream_, direction);
+
+static ssize_t cfg_snd_avirt_stream_map_show(struct config_item *item,
+ char *page)
+{
+ struct snd_avirt_stream *stream =
+ snd_avirt_stream_from_config_item(item);
+
+ return sprintf(page, "%s\n", stream->map);
+}
+
+static ssize_t cfg_snd_avirt_stream_map_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ char *split;
+ struct snd_avirt_stream *stream =
+ snd_avirt_stream_from_config_item(item);
+
+ split = strsep((char **)&page, "\n");
+ memcpy(stream->map, (char *)split, count);
+
+ return count;
+}
+CONFIGFS_ATTR(cfg_snd_avirt_stream_, map);
+
+static ssize_t cfg_snd_avirt_stream_channels_show(struct config_item *item,
+ char *page)
+{
+ ssize_t count;
+ struct snd_avirt_stream *stream =
+ snd_avirt_stream_from_config_item(item);
+
+ count = sprintf(page, "%d\n", stream->channels);
+
+ return count;
+}
+
+static ssize_t cfg_snd_avirt_stream_channels_store(struct config_item *item,
+ const char *page,
+ size_t count)
+{
+ int err;
+ struct snd_avirt_stream *stream =
+ snd_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_snd_avirt_stream_, channels);
+
+static struct configfs_attribute *cfg_snd_avirt_stream_attrs[] = {
+ &cfg_snd_avirt_stream_attr_channels,
+ &cfg_snd_avirt_stream_attr_map,
+ &cfg_snd_avirt_stream_attr_direction,
+ NULL,
+};
+
+static void cfg_snd_avirt_stream_release(struct config_item *item)
+{
+ D_INFOK("item->name:%s", item->ci_namebuf);
+ kfree(snd_avirt_stream_from_config_item(item));
+}
+
+static struct configfs_item_operations cfg_snd_avirt_stream_ops = {
+ .release = cfg_snd_avirt_stream_release,
+};
+
+static struct config_item_type cfg_snd_avirt_stream_type = {
+ .ct_item_ops = &cfg_snd_avirt_stream_ops,
+ .ct_attrs = cfg_snd_avirt_stream_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_item *
+cfg_snd_avirt_stream_make_item(struct config_group *group, const char *name)
+{
+ char *split;
+ int direction;
+ struct snd_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 = snd_avirt_stream_create(split, direction);
+ if (IS_ERR(stream))
+ return ERR_PTR(PTR_ERR(stream));
+
+ config_item_init_type_name(&stream->item, name,
+ &cfg_snd_avirt_stream_type);
+
+ return &stream->item;
+}
+
+static ssize_t cfg_snd_avirt_stream_group_sealed_show(struct config_item *item,
+ char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n", snd_avirt_streams_sealed());
+}
+
+static ssize_t cfg_snd_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;
+ }
+
+ snd_avirt_streams_seal();
+
+ return count;
+}
+CONFIGFS_ATTR(cfg_snd_avirt_stream_group_, sealed);
+
+static struct configfs_attribute *cfg_snd_avirt_stream_group_attrs[] = {
+ &cfg_snd_avirt_stream_group_attr_sealed,
+ NULL,
+};
+
+static struct configfs_group_operations cfg_snd_avirt_stream_group_ops = {
+ .make_item = cfg_snd_avirt_stream_make_item
+};
+
+static struct config_item_type cfg_stream_group_type = {
+ .ct_group_ops = &cfg_snd_avirt_stream_group_ops,
+ .ct_attrs = cfg_snd_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 = "snd-avirt",
+ .ci_type = &cfg_avirt_group_type,
+ },
+ },
+};
+
+int __init snd_avirt_configfs_init(struct snd_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 snd_avirt_configfs_exit(struct snd_avirt_core *core)
+{
+ configfs_unregister_default_group(core->stream_group);
+ configfs_unregister_subsystem(&cfg_subsys);
+}