Android驱动开发之earlysuspend睡眠模式编程总结

（1）添加头文件：

#include <linux/earlysuspend.h>

（2）在特定驱动结构体中添加early_suspend结构：

#ifdef CONFIG_HAS_EARLYSUSPEND
struct early_suspend early_suspend;
#endif

（3）在驱动probe函数中注册相关early_suspend结构体：

#ifdef CONFIG_HAS_EARLYSUSPEND
ftk_ts->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;
ftk_ts->early_suspend.suspend = stm_ts_early_suspend;
ftk_ts->early_suspend.resume =stm_ts_late_resume;
register_early_suspend(&ftk_ts->early_suspend);
#endif

（4）在驱动remove函数取消early_suspend结构体的注册：

#ifdef CONFIG_HAS_EARLYSUSPEND
unregister_early_suspend(&ts->early_suspend);
#endif

（5）定义相关suspend和resume函数：

#ifdef CONFIG_HAS_EARLYSUSPEND
static void stm_ts_early_suspend(struct early_suspend *h)
{
struct ftk_ts *ts;
ts = container_of(h, struct ftk_ts, early_suspend);
stm_ts_suspend(ts->client, PMSG_SUSPEND);
}

static void stm_ts_late_resume(struct early_suspend *h)
{
struct ftk_ts *ts;
ts = container_of(h, struct ftk_ts, early_suspend);
stm_ts_resume(ts->client);
}
#endif

（6）在系统驱动结构体中设置未使用earlysuspend的函数接口：

#ifndef CONFIG_HAS_EARLYSUSPEND
.suspend = stm_ts_suspend,
.resume = stm_ts_resume,
#endif