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标题: DozeResume/DozeSuspend Resume/Suspend 的区别 [打印本页]

作者: 刘允礼 时间: 2024-6-3 16:17
标题: DozeResume/DozeSuspend Resume/Suspend 的区别
HdfTouch的驱动代码，发现只注册了DozeResume  /DozeSuspend ，没有使用 Resume /Suspend
static void HdfTouchDriverRegisterPowerListener(struct HdfDeviceObject *device)
{
int ret;
static struct IPowerEventListener powerListener = {0};
HDF_LOGI("%s::enter!", __func__);
powerListener.DozeResume = HdfTouchDriverDozeResume;
powerListener.DozeSuspend = HdfTouchDriverDozeSuspend;
powerListener.Resume = NULL;
powerListener.Suspend = NULL;

ret = HdfPmRegisterPowerListener(device, &powerListener);
HDF_LOGI("%s:register power listener, ret = %d", __func__, ret);
}
检查IPowerEventListener 接口，并没有关于DozeSuspend  和 Suspend  区别的详细介绍。
struct IPowerEventListener {
int (*DozeResume)(struct HdfDeviceObject *deviceObject);
int (*DozeSuspend)(struct HdfDeviceObject *deviceObject);
/** Wakes up the driver device. The driver developer implements the operation. */
int (*Resume)(struct HdfDeviceObject *deviceObject);
/** Hibernates the driver device. The driver developer implements the operation. */
int (*Suspend)(struct HdfDeviceObject *deviceObject);
};
反查IPowerEventListener  代码
int PowerStateChange(struct PowerStateToken *stateToken, uint32_t pEvent)
{
switch (pEvent) {
      case POWER_STATE_SUSPEND:
            return stateToken->listener->Suspend(stateToken->deviceObject);
      case POWER_STATE_RESUME:
            return stateToken->listener->Resume(stateToken->deviceObject);
      case POWER_STATE_DOZE_SUSPEND:
return stateToken->listener->DozeSuspend(stateToken->deviceObject);
      case POWER_STATE_DOZE_RESUME:
return stateToken->listener->DozeResume(stateToken->deviceObject);
}
}
PowerStateChange根据 POWER_STATE 的不同调用不同的函数接口。
再继续查
static int32_t KernalSpacePmNotify(int32_t powerEvent)
{
switch (powerEvent) {
      case KEVENT_POWER_SUSPEND:
         pmStatus = POWER_STATE_SUSPEND;
      case KEVENT_POWER_DISPLAY_OFF:
         pmStatus = POWER_STATE_DOZE_SUSPEND;
      case KEVENT_POWER_RESUME:
         pmStatus = POWER_STATE_RESUME;
      case KEVENT_POWER_DISPLAY_ON:
         pmStatus = POWER_STATE_DOZE_RESUME;
}
return devmgrClnt->devMgrSvcIf->PowerStateChange(devmgrClnt->devMgrSvcIf, pmStatus);
}
由KernalSpacePmNotify根据 KEVENT_POWER 走不同的分支。这里就能能看到 KEVENT_POWER_DISPLAY_OFF 走到了 POWER_STATE_DOZE_SUSPEND，KEVENT_POWER_SUSPEND 走到了 POWER_STATE_SUSPEND。

int32_t KeventFbNotifierFn(struct notifier_block *nb, unsigned long event, void *data)
{
keventModule = CONTAINER_OF(nb, struct HdfKeventModule, fbNotifier);
blank = fbEvent->data;
if (*blank == FB_BLANK_UNBLANK) {
      powerEvent = KEVENT_POWER_DISPLAY_ON;
} else {
      HDF_LOGI("%s:receive display off event", __func__);
      powerEvent = KEVENT_POWER_DISPLAY_OFF;

ret = SendKevent(keventModule, HDF_SYSEVENT_CLASS_POWER, powerEvent, NULL, sync);
return KernalSpacePmNotify(powerEvent);
}

static int32_t KeventPmNotifierFn(struct notifier_block *nb, unsigned long action, void *dummy)
{
   keventModule = CONTAINER_OF(nb, struct HdfKeventModule, keventPmNotifier);
switch (action) {
      case PM_SUSPEND_PREPARE:
         powerEvent = KEVENT_POWER_SUSPEND;
      case PM_POST_SUSPEND:
         powerEvent = KEVENT_POWER_RESUME;
}
ret = SendKevent(keventModule, HDF_SYSEVENT_CLASS_POWER, powerEvent, NULL, sync);
return KernalSpacePmNotify(powerEvent);
}

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