1 /*
2 * Copyright (c) 2017, The Linux Foundation. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *   * Redistributions of source code must retain the above copyright
8 *     notice, this list of conditions and the following disclaimer.
9 *   * Redistributions in binary form must reproduce the above
10 *     copyright notice, this list of conditions and the following
11 *     disclaimer in the documentation and/or other materials provided
12 *     with the distribution.
13 *   * Neither the name of The Linux Foundation nor the names of its
14 *     contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
24 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
26 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
27 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29 
30 #ifndef __DRM_LIB_LOADER_H__
31 #define __DRM_LIB_LOADER_H__
32 
33 #include <drm_interface.h>
34 #include <mutex>
35 
36 namespace drm_utils {
37 
38 class DRMLibLoader {
39  public:
40   ~DRMLibLoader();
41   bool IsLoaded() { return is_loaded_; }
42   sde_drm::GetDRMManager FuncGetDRMManager() { return func_get_drm_manager_; }
43   sde_drm::DestroyDRMManager FuncDestroyDRMManager() { return func_destroy_drm_manager_; }
44 
45   static DRMLibLoader *GetInstance();
46   static void Destroy();
47 
48  private:
49   DRMLibLoader();
50   bool Open(const char *lib_name);
51   bool Sym(const char *func_name, void **func_ptr);
52 
53   void *lib_ = {};
54   sde_drm::GetDRMManager func_get_drm_manager_ = {};
55   sde_drm::DestroyDRMManager func_destroy_drm_manager_ = {};
56   bool is_loaded_ = false;
57 
58   static DRMLibLoader *s_instance;  // Singleton instance
59   static std::mutex s_lock;
60 };
61 
62 }  // namespace drm_utils
63 
64 #endif  // __DRM_LIB_LOADER_H__
65