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一、 驱动层调试

1、在板级dts文件中增加相应的dts代码，

如：调试sensor类，在代码中找到已经有的代码在修改，I2C使用那根（一般为I2C3），I2C地址（找datasheet或者FAE），哪个中断引脚（看原理图）。

twsi3: i2c@d4013800 {

                                mc3xxx@4c {

compatible = "mc3, mc3xxx";

reg = <0x4c>;

interrupt-parent = <&gpio>;

interrupts = <91 0x1>;

irq-gpios = <&gpio 91 0>;

avdd-supply = <&ldo4>;

status = "okay";

};

      epl2182@49 {

compatible = "epl,epl2182";

reg = <0x49>;

interrupt-parent = <&gpio>;

interrupts = <4 0x1>;

irq-gpios = <&gpio 4 0>;

avdd-supply = <&ldo4>;

};

}

;

2、在_defconfig中打开相应的driver文件

3、如何判断driver是否调通？1）编译后下载后，通过adb 中getevent判断是否驱动产生了设备节点shell@MMX:/ # geteventgeteventcould not get driver version for /dev/input/mouse0, Not a typewriteradd device 1: /dev/input/event1  name:     "vnc-ts"add device 2: /dev/input/event7  name:     "map asoc Hook"add device 3: /dev/input/event8  name:     "map asoc Headset"add device 4: /dev/input/event0  name:     "pxa27x-keypad"

add device 5: /dev/input/event3

  name:     "88pm886_on"add device 6: /dev/input/event2  name:     "msg2238"add device 7: /dev/input/event6  name:     "APDS_proximity_sensor"add device 8: /dev/input/event5  name:     "APDS_light_sensor"add device 9: /dev/input/event4  name:     "accelerometer"

通过以上可以看出为dev/input/event5 和/dev/input/event6  ，

2）确定是否有报点上传 通过以下命令进行判断

1|shell@:/sys/class/input/input5 $ cat active

cat active0shell@:/sys/class/input/input5 $ echo 1 >activeecho 1 >activeshell@:/sys/class/input/input5 $ geteventgeteventcould not get driver version for /dev/input/mouse0, Not a typewriteradd device 1: /dev/input/event1  name:     "vnc-ts"add device 2: /dev/input/event7  name:     "map asoc Hook"add device 3: /dev/input/event8  name:     "map asoc Headset"add device 4: /dev/input/event0  name:     "pxa27x-keypad"add device 5: /dev/input/event3  name:     "88pm886_on"add device 6: /dev/input/event2  name:     "msg2238"add device 7: /dev/input/event6  name:     "APDS_proximity_sensor"add device 8: /dev/input/event5  name:     "APDS_light_sensor"add device 9: /dev/input/event4  name:     "accelerometer"could not get driver version for /dev/input/mice, Not a typewriter/dev/input/event5: 0003 0018 00000066/dev/input/event5: 0000 0000 00000000/dev/input/event5: 0003 0018 0000006d/dev/input/event5: 0000 0000 00000000/dev/input/event3: 0001 0074 00000001/dev/input/event3: 0000 0000 00000000/dev/input/event4: 0003 0000 0000000b/dev/input/event4: 0000 0000 00000000/dev/input/event3: 0001 0074 00000000/dev/input/event3: 0000 0000 00000000/dev/input/event4: 0003 0000 fffffff5

#adb shell getevent -lr /dev/input/event5

手动验证有数据传上来，说明driver工作正常。

二、framework层调试

1） 判断framework使用那套流程，打开相应的宏开关通过sensors_hal.cpp中查看开关那个红BOARD_HAVE_AVAGO=true2)驱动层有设备节点是否跟framework层一致。Driver:static const char ElanPsensorName[] = "APDS_proximity_sensor";static const char ElanALsensorName[] = "APDS_light_sensor";framework:AvagoLightSensor::AvagoLightSensor()    : LightSensorSet("APDS_light_sensor"){ }3)上报的诗句是否与farmework中处理的是否一致Driver中：input_report_abs(epld->als_input_dev, ABS_PRESSURE, lux);framework中：int LightSensorSet::readEvents(sensors_event_t* data, int count){   

…  …

     if ((type == EV_ABS) && (event->value > 0)) {             if (event->code == ABS_PRESSURE) {                 mPendingEvent.light = event->value;                valid = true;                if (LOG_DBG)                    LOGD("LightSensor: read value = %f", mPendingEvent.light);            }        } else if ( (type == EV_SYN) && valid ) { 4) 注意使能标志位是否一致。Driver中： static struct device_attribute dev_attr_light_enable =__ATTR(active, S_IRWXUGO,  light_enable_show, light_enable_store);Framework中：int LightSensorSet::enable(int32_t handle, int en){     int flags = en ? 1 : 0;    if (flags != mEnabled) {         int fd;        char enablePath[PATH_MAX];        sprintf(enablePath, "%s/%s", mClassPath, "active");

        if (LOG_DBG)

   LOGD("LightSensor enable path is %s", enablePath);        fd = open(enablePath, O_RDWR);        if (fd >= 0) {             err = write(fd, buf, sizeof(buf));            close(fd);    return 0;}

三、应用层调试

安装并使用测试sensor APP来判断是否能工作。

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