【检测原理】 

（1） 耳机检测方式为EINT+AuxADC。

（2） EINT HISR为AUX_EINT_HISR，在aux_task_main中注册中断。插入耳机，若是高电平触发中断，需要保证AUX_EINT_STATE为1，否则为0。

（3） hook key的检测采用ADC。当耳机plug in，trigger AUX_EINT_HISR，此时turn on micbias， double check plug in state后，再发送msg AUX_ID_EARPHONE给UEM。  

然后turn off micbias。当aux收到来电消息，也会turn on micbias，检测SENDKEY ADC，直到挂断电话，才turn off micbias。

【软件配置】ACCDET_SUPPORT=FALSE

【典型平台】MT6236,MT6252 

【检测原理】  

（1） 耳机检测方式为ACCDET only。

（2） HISR为ACCDET_HISR，在ACCDET_INIT注册。

（3） hook key的检测采用ACCDET。

（4） 耳机状态与accdet处的电压对应关系如下表： 

表（一）

| Earphone state | Accdet voltage | Comparator AB state |

|-----------------|---------------|---------------------|

|Plug out|1.9V|A=1，B=1|

|Plug in|0.4V~1.7V|A=0，B=1|

|Hook key pressed|0V|A=0，B=0| 

【软件配置】ACCDET_SUPPORT=TRUE

【典型平台】MT6276,MT6250D/MT6250

【检测原理】

（1） 耳机检测方式为EINT+ACCDET。

（2） EINT HISR为AUX_EINT2_HISR，在ACCDET_INIT注册。插入耳机，若是高电平触发中断，需要将AUX_EINT_STATE置为1，否则置为0。

（3） hook key的检测采用accdet。

（4） 耳机状态与accdet处的电压对应关系同表(一)。

（5） 耳机插入，触发eint之后，enable ACCDET，耳机拔出之后会disable ACCDET。

【软件配置】ACCDET_SUPPORT=EINT_ACCDET

【典型平台】MT6255,MT6250/MT6250D

耳机按键

单键耳机实现播放，暂停

alps\mediatek\platform\mt6572\kernel\drivers\accdet下accdet.c 函数check_cable_type中case MIC_BIAS:下添加如下代码：

if(call_status == 0) 
{ 
if(is_long_press()) 
{ 
ACCDET_DEBUG("[Accdet]send long press remote button event %d \n",ACC_END_CALL); 
notify_sendKeyEvent(ACC_END_CALL); 
} else { 
ACCDET_DEBUG("[Accdet]send short press remote button event %d\n",ACC_MEDIA_PLAYPAUSE); 
notify_sendKeyEvent(ACC_MEDIA_PLAYPAUSE); 
} 
} 
if(call_status != 0) 
{ 
if(is_long_press()) 
{ 
ACCDET_DEBUG("[Accdet]send long press remote button event %d \n",ACC_MEDIA_PREVIOUS); 
notify_sendKeyEvent(ACC_MEDIA_PREVIOUS); 
} else { 
ACCDET_DEBUG("[Accdet]send short press remote button event %d\n",ACC_MEDIA_PLAYPAUSE); 
notify_sendKeyEvent(ACC_MEDIA_PLAYPAUSE); 
} 
}

备注：KEY_****相关宏都定义在input.h文件中

KEY_PREVIOUSSONG：上一曲

实现下一曲（在框架层）

有些耳机只有一个按键, 需要通过一个按键来实现播放,暂停,下一首,上一首的功能 
功能定义: 
单击: 播放/暂停 
双击: 下一首 
三击: 上一首

[SOLUTION]

完整方案如下，只需要修改 phoneWindowManager.java 
1: 加入定义：

<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">long</span> preLastHeadsethookDownTime=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>,preLastHeadsethookUpTime=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, lastHeadsethookDownTime = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, lastHeadsethookUpTime = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">long</span> thisHeadsethookDownTime = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, thisHeadsethookUpTime = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> clickCount = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>

2：加入方法：

<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">sendHeadsetBroadcast</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> clickCount){Log.d(TAG,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"clickCount="</span>+clickCount);KeyEvent <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">event</span>;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">switch</span>(clickCount){ <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">event</span> = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> KeyEvent(thisHeadsethookUpTime,thisHeadsethookDownTime, KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PREVIOUS, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>);<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">event</span> = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> KeyEvent(thisHeadsethookUpTime,thisHeadsethookDownTime,KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_NEXT,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>);<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">default</span>:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">event</span> = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> KeyEvent(thisHeadsethookUpTime,thisHeadsethookDownTime,KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_HEADSETHOOK,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>);<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>;}Log.d(TAG,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"keycode = "</span>+<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">event</span>.getKeyCode());Intent intent = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Intent();intent.setAction(Intent.ACTION_MEDIA_BUTTON);intent.putExtra(Intent.EXTRA_KEY_EVENT,<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">event</span>);mContext.sendBroadcast(intent);intent = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Intent();<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">event</span> = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">event</span>.changeAction(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">event</span>,KeyEvent.ACTION_UP);intent.setAction(Intent.ACTION_MEDIA_BUTTON);intent.putExtra(Intent.EXTRA_KEY_EVENT,<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">event</span>);mContext.sendBroadcast(intent); }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li></ul>

3： interceptKeyBeforeQueueing 方法内 
在参考行 
int result; 
之后加入如下语句：

<code class="hljs lasso has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(keyCode <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">==</span> KeyEvent<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>KEYCODE_HEADSETHOOK <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">/*KeyEvent.KEYCODE_VOLUME_DOWN*/</span>){ <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(down){<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//this is headsethook down             </span>preLastHeadsethookDownTime <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> lastHeadsethookDownTime;lastHeadsethookDownTime <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> thisHeadsethookDownTime;thisHeadsethookDownTime <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> event<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>getEventTime();}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>{preLastHeadsethookUpTime <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> lastHeadsethookUpTime;lastHeadsethookUpTime <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> thisHeadsethookUpTime;thisHeadsethookUpTime <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> event<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>getEventTime();<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Log</span><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>d(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">TAG</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"thisHeadsethookUpTime="</span><span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">+</span>thisHeadsethookUpTime<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">+</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">",thisHeadsethookDownTime="</span><span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">+</span>thisHeadsethookDownTime);<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Log</span><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>d(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">TAG</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"lastHeadsethookUpTime="</span><span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">+</span>lastHeadsethookUpTime<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">+</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">",lastHeadsethookDownTime="</span><span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">+</span>lastHeadsethookDownTime);<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Log</span><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>d(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">TAG</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"preLastHeadsethookUpTime="</span><span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">+</span>preLastHeadsethookUpTime<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">+</span><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">",preLastHeadsethookDownTime="</span><span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">+</span>preLastHeadsethookDownTime);<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>((thisHeadsethookUpTime <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">-</span> thisHeadsethookDownTime) <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;"><</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">500</span>){<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>((thisHeadsethookDownTime<span class="hljs-attribute" style="box-sizing: border-box;">-lastHeadsethookDownTime</span>)<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">></span><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">500</span>){<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Log</span><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>d(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">TAG</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"new click serial detected"</span>);clickCount <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>;mHandler<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>postDelayed(<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">new</span> Runnable(){<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">void</span> run() {<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Log</span><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>d(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">TAG</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"call sendHeadsetBroadcast clickCount="</span><span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">+</span>clickCount);sendHeadsetBroadcast(clickCount);}}, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1000</span>);}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>{<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Log</span><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>d(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">TAG</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"click serial runing"</span>);<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>((thisHeadsethookUpTime <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">-</span> preLastHeadsethookUpTime)<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">></span><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1000</span>){<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Log</span><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>d(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">TAG</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"double click detect"</span>);clickCount <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>;}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>{<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Log</span><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>d(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">TAG</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"triple click detect"</span>);clickCount <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>;}}}}result <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;result <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">&=</span> ~ACTION_PASS_TO_USER;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> result;}</code>