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      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