qcacld-2.0的wlan分析

qcacld-2.0是Qualcomm WLAN Driver。
分析开放的驱动代码：
https://github.com/myrom/opensource_wlan_qcacld-2.0.git

git得到源码。

根据__init找到入口文件opensource_wlan_qcacld-2.0/CORE/HDD/src/wlan_hdd_main.c

static int __init hdd_module_init ( void)
{
   return hdd_driver_init();
} 

驱动初始化函数hdd_driver_init

/**---------------------------------------------------------------------------

  \brief hdd_driver_init() - Core Driver Init Function

   This is the driver entry point - called in different time line depending
   on whether the driver is statically or dynamically linked

  \param  - None

  \return - 0 for success, non zero for failure

  --------------------------------------------------------------------------*/
static int hdd_driver_init( void)
{
   VOS_STATUS status;
   v_CONTEXT_t pVosContext = NULL;
   int ret_status = 0;
   unsigned long rc;

#ifdef WLAN_LOGGING_SOCK_SVC_ENABLE
   wlan_logging_sock_init_svc();
#endif

   ENTER();

#ifdef TIMER_MANAGER
      vos_timer_manager_init();
#endif

#ifdef MEMORY_DEBUG
      vos_mem_init();
#endif

   vos_wake_lock_init(&wlan_wake_lock, "wlan");
   hdd_prevent_suspend(WIFI_POWER_EVENT_WAKELOCK_DRIVER_INIT);
   /*
    * The Krait is going to Idle/Stand Alone Power Save
    * more aggressively which is resulting in the longer driver load time.
    * The Fix is to not allow Krait to enter Idle Power Save during driver load.
    */

   hdd_request_pm_qos(DISABLE_KRAIT_IDLE_PS_VAL);

   vos_ssr_protect_init();

   pr_info("%s: loading driver v%s\n", WLAN_MODULE_NAME,
           QWLAN_VERSIONSTR TIMER_MANAGER_STR MEMORY_DEBUG_STR);

   do {

#ifndef MODULE
      if (WLAN_IS_EPPING_ENABLED(con_mode)) {
         ret_status =  epping_driver_init(con_mode, &wlan_wake_lock,
                          WLAN_MODULE_NAME);
         if (ret_status < 0) {
            hdd_remove_pm_qos();
            hdd_allow_suspend(WIFI_POWER_EVENT_WAKELOCK_DRIVER_INIT);
            vos_wake_lock_destroy(&wlan_wake_lock);
         }
         return ret_status;
      }
#else
      if (WLAN_IS_EPPING_ENABLED(hdd_get_conparam())) {
         ret_status = epping_driver_init(hdd_get_conparam(),
                         &wlan_wake_lock, WLAN_MODULE_NAME);
         if (ret_status < 0) {
            hdd_remove_pm_qos();
            hdd_allow_suspend(WIFI_POWER_EVENT_WAKELOCK_DRIVER_INIT);
            vos_wake_lock_destroy(&wlan_wake_lock);
         }
         return ret_status;
      }
#endif

      /* Preopen VOSS so that it is ready to start at least SAL */
      status = vos_preOpen(&pVosContext);

   if (!VOS_IS_STATUS_SUCCESS(status))
   {
         hddLog(VOS_TRACE_LEVEL_FATAL,"%s: Failed to preOpen VOSS", __func__);
         ret_status = -1;
         break;
   }

#ifdef HDD_TRACE_RECORD
   MTRACE(hddTraceInit());
#endif

#ifndef MODULE
      /* For statically linked driver, call hdd_set_conparam to update curr_con_mode
       */
      hdd_set_conparam((v_UINT_t)con_mode);
#endif

#define HDD_WLAN_START_WAIT_TIME VOS_WDA_TIMEOUT + 5000

   init_completion(&wlan_start_comp);

   ret_status = hif_register_driver();
   if (!ret_status) {
       rc = wait_for_completion_timeout(
                           &wlan_start_comp,
                           msecs_to_jiffies(HDD_WLAN_START_WAIT_TIME));
       if (!rc) {
          hddLog(VOS_TRACE_LEVEL_FATAL,
            "%s: timed-out waiting for hif_register_driver", __func__);
           ret_status = -1;
       } else
           ret_status = 0;
   }

   hdd_remove_pm_qos();
   hdd_allow_suspend(WIFI_POWER_EVENT_WAKELOCK_DRIVER_INIT);

   if (ret_status) {
       hddLog(VOS_TRACE_LEVEL_FATAL, "%s: WLAN Driver Initialization failed",
               __func__);
       hif_unregister_driver();
       vos_preClose( &pVosContext );
       ret_status = -ENODEV;
       break