wake on wlan无线唤醒_睡眠后重启才能连接WiFi

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（1）添加头文件：

#include “core.h”

在core.h文件中有：

#ifdef CONFIG_HAS_EARLYSUSPEND

#include <linux/earlysuspend.h>

#endif

（2）在wifi驱动ath6kl结构体中添加early_suspend结构：

#ifdef CONFIG_HAS_EARLYSUSPEND

struct early_suspend early_suspend;

bool screen_off;

#endif

（3）在wifi驱动的电源管理文件pm.c中填充early_suspend结构体，并将其向android电源管理系统注册：

#ifdef CONFIG_HAS_EARLYSUSPEND

ar->screen_off = false;

ar->early_suspend.suspend = ath6kl_early_suspend;

ar->early_suspend.resume = ath6kl_late_resume;

ar->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN;

register_early_suspend(&ar->early_suspend);

#endif

所有注册到系统中的early_suspend结构都会按level值按顺序加入到全局链表early_suspend_handlers中。

希望执行early suspend的设备，他的设备驱动程序需要向电源管理系统注册，该结构体用于向电源管理系统注册earlysuspend/lateresume，当电源管理系统启动suspend流程时，回调函数suspend会被调用，相反，resume的最后阶段，回调函数resume会被调用，level字段用于调整该结构体在注册链表中的位置，suspend时，level的数值越小，回调函数的被调用的时间越早，resume时则反过来。

Android在earlysuspend.h中预先定义了3个level等级：

enum {

EARLY_SUSPEND_LEVEL_BLANK_SCREEN = 50,

EARLY_SUSPEND_LEVEL_STOP_DRAWING = 100,

EARLY_SUSPEND_LEVEL_DISABLE_FB = 150,

};

具体请见附件kernel/include/linux/earlysuspend.h

（4）在wifi驱动电源管理文件pm.c中取消early_suspend结构体的注册：

#ifdef CONFIG_HAS_EARLYSUSPEND

unregister_early_suspend(&ar->early_suspend);

#endif

（5）定义相关suspend和resume函数：

#ifdef CONFIG_HAS_EARLYSUSPEND

static void ath6kl_early_suspend(struct early_suspend *handler)

{

        struct ath6kl *ar = container_of(handler, struct ath6kl, early_suspend);

        if (ar)

                ar->screen_off = true;

}

static void ath6kl_late_resume(struct early_suspend *handler)

{

        struct ath6kl *ar = container_of(handler, struct ath6kl, early_suspend);

        if (ar)

                ar->screen_off = false;

}

#endif

附：kernel/include/linux/earlysuspend.h

#ifndef _LINUX_EARLYSUSPEND_H

#define _LINUX_EARLYSUSPEND_H

#ifdef CONFIG_HAS_EARLYSUSPEND

#include <linux/list.h>

#endif

/* The early_suspend structure defines suspend and resume hooks to be called

* when the user visible sleep state of the system changes, and a level to

* control the order. They can be used to turn off the screen and input

* devices that are not used for wakeup.

* Suspend handlers are called in low to high level order, resume handlers are

* called in the opposite order. If, when calling register_early_suspend,

* the suspend handlers have already been called without a matching call to the

* Suspend handlers are called in low to high level order, resume handlers are

* called in the opposite order. If, when calling register_early_suspend,

* the suspend handlers have already been called without a matching call to the

* resume handlers, the suspend handler will be called directly from

* register_early_suspend. This direct call can violate the normal level order.

*/

enum {

        EARLY_SUSPEND_LEVEL_BLANK_SCREEN = 50,

        EARLY_SUSPEND_LEVEL_STOP_DRAWING = 100,

        EARLY_SUSPEND_LEVEL_DISABLE_FB = 150,

};

struct early_suspend {

#ifdef CONFIG_HAS_EARLYSUSPEND

        struct list_head link;

        int level;

        void (*suspend)(struct early_suspend *h);

        void (*resume)(struct early_suspend *h);

#endif

};

#ifdef CONFIG_HAS_EARLYSUSPEND

void register_early_suspend(struct early_suspend *handler);

void unregister_early_suspend(struct early_suspend *handler);

#else

#define register_early_suspend(handler) do { } while (0)

#define unregister_early_suspend(handler) do { } while (0)

#endif

#endif