drivers/usb/gadget/function/u_tcm.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * u_tcm.h
   4  *
   5  * Utility definitions for the tcm function
   6  *
   7  * Copyright (c) 2015 Samsung Electronics Co., Ltd.
   8  *              http://www.samsung.com
   9  *
  10  * Author: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxx>
  11  */
  12
  13 #ifndef U_TCM_H
  14 #define U_TCM_H
  15
  16 #include <linux/usb/composite.h>
  17
  18 /**
  19  * @dependent: optional dependent module. Meant for legacy gadget.
  20  * If non-null its refcount will be increased when a tpg is created and
  21  * decreased when tpg is dropped.
  22  * @dep_lock: lock for dependent module operations.
  23  * @ready: true if the dependent module information is set.
  24  * @can_attach: true a function can be bound to gadget
  25  * @has_dep: true if there is a dependent module
  26  *
  27  */
  28 struct f_tcm_opts {
  29         struct usb_function_instance    func_inst;
  30         struct module                   *dependent;
  31         struct mutex                    dep_lock;
  32         bool                            ready;
  33         bool                            can_attach;
  34         bool                            has_dep;
  35
  36         /*
  37          * Callbacks to be removed when legacy tcm gadget disappears.
  38          *
  39          * If you use the new function registration interface
  40          * programmatically, you MUST set these callbacks to
  41          * something sensible (e.g. probe/remove the composite).
  42          */
  43         int (*tcm_register_callback)(struct usb_function_instance *);
  44         void (*tcm_unregister_callback)(struct usb_function_instance *);
  45 };
  46
  47 #endif /* U_TCM_H */