timed_output驱动架构

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android实现的timed_output驱动架构用于定时输出设备。例如马达、leds等。

代码路径：

kernel/drivers/staging/android/timed_output.c，timed_output.h。

实现结构体：

struct timed_output_dev {
           const char   *name;
           /* enable the output and set the timer */
           void   (*enable)(struct timed_output_dev *sdev, int timeout);
           /* returns the current number of milliseconds remaining on the timer */
           int       (*get_time)(struct timed_output_dev *sdev);
           /* private data */
           struct device   *dev;
           int       index;
           int       state;
       };

注册接口：

timed_output_dev_register()

timed_output_dev_unregister()

代码应用：

vib->timed_dev.name = "vibrator";
   vib->timed_dev.get_time = pm8xxx_vib_get_time;
   vib->timed_dev.enable = pm8xxx_vib_enable;
   rc = timed_output_dev_register(&vib->timed_dev);//注册为/sys/class/timed_output/vibrator

调试接口：

最终 #echo 1000 > /sys/class/timed_output/vibrator/enable
最终 #cat /sys/class/timed_output/vibrator/enable

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