drivers/staging/greybus/audio_manager.h

   1 /*
   2  * Greybus operations
   3  *
   4  * Copyright 2015-2016 Google Inc.
   5  *
   6  * Released under the GPLv2 only.
   7  */
   8
   9 #ifndef _GB_AUDIO_MANAGER_H_
  10 #define _GB_AUDIO_MANAGER_H_
  11
  12 #include <linux/kobject.h>
  13 #include <linux/list.h>
  14
  15 #define GB_AUDIO_MANAGER_NAME "gb_audio_manager"
  16 #define GB_AUDIO_MANAGER_MODULE_NAME_LEN 64
  17 #define GB_AUDIO_MANAGER_MODULE_NAME_LEN_SSCANF "63"
  18
  19 struct gb_audio_manager_module_descriptor {
  20         char name[GB_AUDIO_MANAGER_MODULE_NAME_LEN];
  21         int vid;
  22         int pid;
  23         int intf_id;
  24         unsigned int ip_devices;
  25         unsigned int op_devices;
  26 };
  27
  28 struct gb_audio_manager_module {
  29         struct kobject kobj;
  30         struct list_head list;
  31         int id;
  32         struct gb_audio_manager_module_descriptor desc;
  33 };
  34
  35 /*
  36  * Creates a new gb_audio_manager_module_descriptor, using the specified
  37  * descriptor.
  38  *
  39  * Returns a negative result on error, or the id of the newly created module.
  40  *
  41  */
  42 int gb_audio_manager_add(struct gb_audio_manager_module_descriptor *desc);
  43
  44 /*
  45  * Removes a connected gb_audio_manager_module_descriptor for the specified ID.
  46  *
  47  * Returns zero on success, or a negative value on error.
  48  */
  49 int gb_audio_manager_remove(int id);
  50
  51 /*
  52  * Removes all connected gb_audio_modules
  53  *
  54  * Returns zero on success, or a negative value on error.
  55  */
  56 void gb_audio_manager_remove_all(void);
  57
  58 /*
  59  * Retrieves a gb_audio_manager_module_descriptor for the specified id.
  60  * Returns the gb_audio_manager_module_descriptor structure,
  61  * or NULL if there is no module with the specified ID.
  62  */
  63 struct gb_audio_manager_module *gb_audio_manager_get_module(int id);
  64
  65 /*
  66  * Decreases the refcount of the module, obtained by the get function.
  67  * Modules are removed via gb_audio_manager_remove
  68  */
  69 void gb_audio_manager_put_module(struct gb_audio_manager_module *module);
  70
  71 /*
  72  * Dumps the module for the specified id
  73  * Return 0 on success
  74  */
  75 int gb_audio_manager_dump_module(int id);
  76
  77 /*
  78  * Dumps all connected modules
  79  */
  80 void gb_audio_manager_dump_all(void);
  81
  82 #endif /* _GB_AUDIO_MANAGER_H_ */