sns_ sensor_ instance_ api

//
As shown in the figure ：
spl07_inst_init This Where does the function begin to execute …

Of course For this kind of determination where the function is called , There is a general method ： Print stack , Then analysis elf file , You can find it . however High pass adsp compiled elf file , I don't know how to parse it …
Try to use objdump perhaps arm Of objdump Tools I can't figure it out .
The card owner in an instant ???

not so bad , I saw this article on the Internet , Just record …
Look at Qualcomm's documentation
instance yes from client ( It can also be sensor ) Created …

sns_sensor_init_fw

Take a look at this function

sns_rc
sns_sensor_init_fw(void)
{
    
	.....
	sensor_cb = (sns_sensor_cb)
  {
    
    .struct_len = sizeof(sensor_cb),
    .get_service_manager = &get_service_manager,
    .get_sensor_instance = &get_sensor_instance,
    .create_instance = &sns_sensor_instance_init,
    .remove_instance = &sns_sensor_instance_deinit,
    .get_library_sensor = &get_library_sensor,
    .get_registration_index = &get_registration_index,
    .create_instance_v2 = &sns_sensor_instance_init_v2,
  };
  ......
}
create_instance  Let's go in at    look down 

look down create_instance This note ：
Allocation and initialization sensor Of example
Would call init . I don't know. Which one? init ??? because
.create_instance = &sns_sensor_instance_init,
Go in and have a look sns_sensor_instance_init

SNS_SECTION(".text.sns") sns_sensor_instance*
sns_sensor_instance_init(sns_sensor *sensor, uint32_t state_len)
{
    
  return sns_sensor_instance_init_v2(sensor, state_len, 0);
}

Looking at the sns_sensor_instance_init_v2

SNS_SECTION(".text.sns") sns_sensor_instance*
sns_sensor_instance_init_v2(sns_sensor *sensor, uint32_t state_len,
    uint32_t state_len_ni)
{
    
 ......   // sensor  The number of 
   uint32_t sensors_cnt = fw_sensor->library->sensors.cnt;
   
....   binding  instance.cb  
  instance->instance.cb = &instance_cb;
//  initialization   Some linked lists ... 
// instance->client_req_lists  It's empty  ,instance->data_streams  It's empty 
 sns_isafe_list_init(&instance->client_req_lists);
  sns_isafe_list_init(&instance->data_streams);
 
//  use  instance  initialization  instance->list_entry 
  sns_isafe_list_item_init(&instance->list_entry, instance);
......  I don't know what to do 
for(uint8_t i = 0; i < ARR_SIZE(state_init); i++)
    if(NULL != state_init[i].init)
      state_init[i].init(instance, fw_sensor);

// ----  This   Will be called to   Specifically driven  
//  such as ： sns_sensor_instance_api sns_see_spl07_sensor_instance_api
rv = sensor->instance_api->init(
          (sns_sensor_instance*)instance, sensor->state);
}

So here comes the question , Who will call it ？
spl07_sensor_set_client_request This function There are

create_instance ：  Will enter the above 
instance = this->cb->create_instance(this,	                                  sizeof(spl07_instance_state));

rv = sensor->instance_api->init(
          (sns_sensor_instance*)instance, sensor->state);
          

Update the client request of the sensor (.set_client_request())
Here you can. 　 See 　instance yes sensor Of 　 example , You need to , I'll create it …
therefore 　 This 　　 Is belong to 　　sns_sensor_api　 Inside