// SPDX-License-Identifier: GPL-2.0
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/*
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* Greybus operations
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*
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* Copyright 2015-2016 Google Inc.
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*/
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#include <linux/string.h>
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#include <linux/sysfs.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/idr.h>
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#include "audio_manager.h"
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#include "audio_manager_private.h"
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static struct kset *manager_kset;
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static LIST_HEAD(modules_list);
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static DECLARE_RWSEM(modules_rwsem);
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static DEFINE_IDA(module_id);
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/* helpers */
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static struct gb_audio_manager_module *gb_audio_manager_get_locked(int id)
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{
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struct gb_audio_manager_module *module;
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if (id < 0)
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return NULL;
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list_for_each_entry(module, &modules_list, list) {
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if (module->id == id)
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return module;
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}
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return NULL;
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}
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/* public API */
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int gb_audio_manager_add(struct gb_audio_manager_module_descriptor *desc)
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{
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struct gb_audio_manager_module *module;
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int id;
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int err;
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id = ida_simple_get(&module_id, 0, 0, GFP_KERNEL);
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if (id < 0)
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return id;
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err = gb_audio_manager_module_create(&module, manager_kset,
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id, desc);
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if (err) {
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ida_simple_remove(&module_id, id);
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return err;
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}
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/* Add it to the list */
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down_write(&modules_rwsem);
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list_add_tail(&module->list, &modules_list);
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up_write(&modules_rwsem);
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return module->id;
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}
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EXPORT_SYMBOL_GPL(gb_audio_manager_add);
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int gb_audio_manager_remove(int id)
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{
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struct gb_audio_manager_module *module;
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down_write(&modules_rwsem);
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module = gb_audio_manager_get_locked(id);
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if (!module) {
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up_write(&modules_rwsem);
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return -EINVAL;
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}
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list_del(&module->list);
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kobject_put(&module->kobj);
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up_write(&modules_rwsem);
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ida_simple_remove(&module_id, id);
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return 0;
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}
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EXPORT_SYMBOL_GPL(gb_audio_manager_remove);
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void gb_audio_manager_remove_all(void)
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{
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struct gb_audio_manager_module *module, *next;
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int is_empty;
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down_write(&modules_rwsem);
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list_for_each_entry_safe(module, next, &modules_list, list) {
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list_del(&module->list);
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ida_simple_remove(&module_id, module->id);
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kobject_put(&module->kobj);
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}
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is_empty = list_empty(&modules_list);
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up_write(&modules_rwsem);
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if (!is_empty)
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pr_warn("Not all nodes were deleted\n");
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}
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EXPORT_SYMBOL_GPL(gb_audio_manager_remove_all);
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struct gb_audio_manager_module *gb_audio_manager_get_module(int id)
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{
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struct gb_audio_manager_module *module;
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down_read(&modules_rwsem);
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module = gb_audio_manager_get_locked(id);
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kobject_get(&module->kobj);
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up_read(&modules_rwsem);
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return module;
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}
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EXPORT_SYMBOL_GPL(gb_audio_manager_get_module);
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void gb_audio_manager_put_module(struct gb_audio_manager_module *module)
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{
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kobject_put(&module->kobj);
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}
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EXPORT_SYMBOL_GPL(gb_audio_manager_put_module);
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int gb_audio_manager_dump_module(int id)
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{
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struct gb_audio_manager_module *module;
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down_read(&modules_rwsem);
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module = gb_audio_manager_get_locked(id);
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up_read(&modules_rwsem);
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if (!module)
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return -EINVAL;
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gb_audio_manager_module_dump(module);
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return 0;
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}
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EXPORT_SYMBOL_GPL(gb_audio_manager_dump_module);
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void gb_audio_manager_dump_all(void)
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{
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struct gb_audio_manager_module *module;
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int count = 0;
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down_read(&modules_rwsem);
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list_for_each_entry(module, &modules_list, list) {
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gb_audio_manager_module_dump(module);
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count++;
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}
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up_read(&modules_rwsem);
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pr_info("Number of connected modules: %d\n", count);
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}
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EXPORT_SYMBOL_GPL(gb_audio_manager_dump_all);
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/*
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* module init/deinit
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*/
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static int __init manager_init(void)
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{
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manager_kset = kset_create_and_add(GB_AUDIO_MANAGER_NAME, NULL,
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kernel_kobj);
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if (!manager_kset)
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return -ENOMEM;
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#ifdef GB_AUDIO_MANAGER_SYSFS
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gb_audio_manager_sysfs_init(&manager_kset->kobj);
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#endif
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return 0;
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}
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static void __exit manager_exit(void)
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{
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gb_audio_manager_remove_all();
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kset_unregister(manager_kset);
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ida_destroy(&module_id);
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}
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module_init(manager_init);
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module_exit(manager_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Svetlin Ankov <ankov_svetlin@projectara.com>");
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