drivers/usb/gadget/function/u_tcm.h

   1 /*
   2  * u_tcm.h
   3  *
   4  * Utility definitions for the tcm function
   5  *
   6  * Copyright (c) 2015 Samsung Electronics Co., Ltd.
   7  *              http://www.samsung.com
   8  *
   9  * Author: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxx>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #ifndef U_TCM_H
  17 #define U_TCM_H
  18
  19 #include <linux/usb/composite.h>
  20
  21 /**
  22  * @dependent: optional dependent module. Meant for legacy gadget.
  23  * If non-null its refcount will be increased when a tpg is created and
  24  * decreased when tpg is dropped.
  25  * @dep_lock: lock for dependent module operations.
  26  * @ready: true if the dependent module information is set.
  27  * @can_attach: true a function can be bound to gadget
  28  * @has_dep: true if there is a dependent module
  29  *
  30  */
  31 struct f_tcm_opts {
  32         struct usb_function_instance    func_inst;
  33         struct module                   *dependent;
  34         struct mutex                    dep_lock;
  35         bool                            ready;
  36         bool                            can_attach;
  37         bool                            has_dep;
  38
  39         /*
  40          * Callbacks to be removed when legacy tcm gadget disappears.
  41          *
  42          * If you use the new function registration interface
  43          * programmatically, you MUST set these callbacks to
  44          * something sensible (e.g. probe/remove the composite).
  45          */
  46         int (*tcm_register_callback)(struct usb_function_instance *);
  47         void (*tcm_unregister_callback)(struct usb_function_instance *);
  48 };
  49
  50 #endif /* U_TCM_H */