1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/staging/greybus/audio_manager.c b/drivers/staging/greybus/audio_manager.c
new file mode 100644
index 000000000000..aa6508b44fab
--- /dev/null
+++ b/drivers/staging/greybus/audio_manager.c
@@ -0,0 +1,184 @@
+/*
+ * Greybus operations
+ *
+ * Copyright 2015-2016 Google Inc.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/rwlock.h>
+#include <linux/idr.h>
+
+#include "audio_manager.h"
+#include "audio_manager_private.h"
+
+static struct kset *manager_kset;
+
+static LIST_HEAD(modules_list);
+static DECLARE_RWSEM(modules_rwsem);
+static DEFINE_IDA(module_id);
+
+/* helpers */
+static struct gb_audio_manager_module *gb_audio_manager_get_locked(int id)
+{
+	struct gb_audio_manager_module *module;
+
+	if (id < 0)
+		return NULL;
+
+	list_for_each_entry(module, &modules_list, list) {
+		if (module->id == id)
+			return module;
+	}
+
+	return NULL;
+}
+
+/* public API */
+int gb_audio_manager_add(struct gb_audio_manager_module_descriptor *desc)
+{
+	struct gb_audio_manager_module *module;
+	int id;
+	int err;
+
+	id = ida_simple_get(&module_id, 0, 0, GFP_KERNEL);
+	err = gb_audio_manager_module_create(&module, manager_kset,
+					     id, desc);
+	if (err) {
+		ida_simple_remove(&module_id, id);
+		return err;
+	}
+
+	/* Add it to the list */
+	down_write(&modules_rwsem);
+	list_add_tail(&module->list, &modules_list);
+	up_write(&modules_rwsem);
+
+	return module->id;
+}
+EXPORT_SYMBOL_GPL(gb_audio_manager_add);
+
+int gb_audio_manager_remove(int id)
+{
+	struct gb_audio_manager_module *module;
+
+	down_write(&modules_rwsem);
+
+	module = gb_audio_manager_get_locked(id);
+	if (!module) {
+		up_write(&modules_rwsem);
+		return -EINVAL;
+	}
+	list_del(&module->list);
+	kobject_put(&module->kobj);
+	up_write(&modules_rwsem);
+	ida_simple_remove(&module_id, id);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(gb_audio_manager_remove);
+
+void gb_audio_manager_remove_all(void)
+{
+	struct gb_audio_manager_module *module, *next;
+	int is_empty = 1;
+
+	down_write(&modules_rwsem);
+
+	list_for_each_entry_safe(module, next, &modules_list, list) {
+		list_del(&module->list);
+		kobject_put(&module->kobj);
+		ida_simple_remove(&module_id, module->id);
+	}
+
+	is_empty = list_empty(&modules_list);
+
+	up_write(&modules_rwsem);
+
+	if (!is_empty)
+		pr_warn("Not all nodes were deleted\n");
+}
+EXPORT_SYMBOL_GPL(gb_audio_manager_remove_all);
+
+struct gb_audio_manager_module *gb_audio_manager_get_module(int id)
+{
+	struct gb_audio_manager_module *module;
+
+	down_read(&modules_rwsem);
+	module = gb_audio_manager_get_locked(id);
+	kobject_get(&module->kobj);
+	up_read(&modules_rwsem);
+	return module;
+}
+EXPORT_SYMBOL_GPL(gb_audio_manager_get_module);
+
+void gb_audio_manager_put_module(struct gb_audio_manager_module *module)
+{
+	kobject_put(&module->kobj);
+}
+EXPORT_SYMBOL_GPL(gb_audio_manager_put_module);
+
+int gb_audio_manager_dump_module(int id)
+{
+	struct gb_audio_manager_module *module;
+
+	down_read(&modules_rwsem);
+	module = gb_audio_manager_get_locked(id);
+	up_read(&modules_rwsem);
+
+	if (!module)
+		return -EINVAL;
+
+	gb_audio_manager_module_dump(module);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(gb_audio_manager_dump_module);
+
+void gb_audio_manager_dump_all(void)
+{
+	struct gb_audio_manager_module *module;
+	int count = 0;
+
+	down_read(&modules_rwsem);
+	list_for_each_entry(module, &modules_list, list) {
+		gb_audio_manager_module_dump(module);
+		count++;
+	}
+	up_read(&modules_rwsem);
+
+	pr_info("Number of connected modules: %d\n", count);
+}
+EXPORT_SYMBOL_GPL(gb_audio_manager_dump_all);
+
+/*
+ * module init/deinit
+ */
+static int __init manager_init(void)
+{
+	manager_kset = kset_create_and_add(GB_AUDIO_MANAGER_NAME, NULL,
+					   kernel_kobj);
+	if (!manager_kset)
+		return -ENOMEM;
+
+#ifdef GB_AUDIO_MANAGER_SYSFS
+	gb_audio_manager_sysfs_init(&manager_kset->kobj);
+#endif
+
+	return 0;
+}
+
+static void __exit manager_exit(void)
+{
+	gb_audio_manager_remove_all();
+	kset_unregister(manager_kset);
+	ida_destroy(&module_id);
+}
+
+module_init(manager_init);
+module_exit(manager_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Svetlin Ankov <ankov_svetlin@projectara.com>");