[Keypad]如何设计GPIO中断模拟普通按键控制静音等功能

 

[FAQ06059] [Keypad]如何设计GPIO中断模拟普通按键控制静音等功能

Platform: MT6575MT6577MT6589

Branch: ICS2JBJB2

FAQ Content [Description] 如何设计GPIO中断模拟普通按键控制静音等功能   [Solution] 参考设计思路：Kernel 底层可以参考kpd.c的POWEY USE EINT 的方式设计：把Key_MUTE送到framework 1.声明中断下半程的tasklet #if KPD_PWRKEY_USE_EINT static void kpd_pwrkey_handler(unsigned long data); static DECLARE_TASKLET(kpd_pwrkey_tasklet, kpd_pwrkey_handler, 0); static u8 kpd_pwrkey_state = !KPD_PWRKEY_POLARITY; #endif   2.实现中断服务函数 发送按键消息到framework #if KPD_PWRKEY_USE_EINT static void kpd_pwrkey_handler(unsigned long data) {  bool pressed;  u8 old_state = kpd_pwrkey_state;  kpd_pwrkey_state = !kpd_pwrkey_state;  pressed = (kpd_pwrkey_state == !!KPD_PWRKEY_POLARITY);  if (kpd_show_hw_keycode) {   printk(KPD_SAY "(%s) HW keycode = using EINT\n",          pressed ? "pressed" : "released");  }  input_report_key(kpd_input_dev, KPD_PWRKEY_MAP, pressed);  kpd_print("report Linux keycode = %u\n", KPD_PWRKEY_MAP);  /* for detecting the return to old_state */  mt65xx_eint_set_polarity(KPD_PWRKEY_EINT, old_state);  mt65xx_eint_unmask(KPD_PWRKEY_EINT); }   3.kpd_pdrv_probe()中加入__set_bit(KPD_PWRKEY_MAP, kpd_input_dev->keybit); 声明中断初始化：  mt_set_gpio_mode(GPIO_KPD_MUTEKEY_EINT_PIN, GPIO_KPD_MUTEKEY_EINT_PIN_M_EINT);  mt_set_gpio_dir(GPIO_KPD_MUTEKEY_EINT_PIN, GPIO_DIR_IN);  //mt_set_gpio_pull_enable(GPIO_KPD_MUTEKEY_EINT_PIN, GPIO_PULL_DISABLE);  mt_set_gpio_pull_enable(GPIO_KPD_MUTEKEY_EINT_PIN, GPIO_PULL_ENABLE);  mt_set_gpio_pull_select(GPIO_KPD_MUTEKEY_EINT_PIN, GPIO_PULL_UP); #if KPD_PWRKEY_USE_EINT  mt65xx_eint_set_sens(KPD_PWRKEY_EINT, KPD_PWRKEY_SENSITIVE);  mt65xx_eint_set_hw_debounce(KPD_PWRKEY_EINT, KPD_PWRKEY_DEBOUNCE);  mt65xx_eint_registration(KPD_PWRKEY_EINT, true, KPD_PWRKEY_POLARITY,                           kpd_pwrkey_eint_handler, false); #endif 4.dct tool配置GPIO为中断模式 5.注意实现静音按键，拨下开关时间会很长，如果只有一个KEY_MUTE，一直长按(press),没有发release，framework上长按事件会爆掉，建议拔下中断GPIO=0 发KEY_MUTE;拨上中断GPIO=1 发KEY_MUTE1; 如何添加一个按键：请参看MTK online FAQ ：MTK on-line > FAQ Home > SW > ALPS > Driver - input system>FAQ04495 [Keypad]How to add a new key on android ICS\ICS2   或者拔下中断GPIO=0 发KEY_MUTE的press，接着马上发送release;在上层通过lastkey静音，newkey释放静音。 framework上在phonewindowmanager收到按键之后，可以拦截KEY_MUTE和KEY_MUTE1 去设置setting 的DB和静音模式 在framework/base/policy/src/com/android/impl/PhoneWindowManager.java 添加调试code 确认按键正常 if (true) { Log.d(TAG, "interceptKeyTi keyCode=" + keyCode + " down=" + down + " repeatCount=" + repeatCount + " keyguardOn=" + keyguardOn + " mHomePressed=" + mHomePressed); } //ADD log check the mute key dispatching if(keyCode == KeyEvent.KEYCODE_MUTE) Log.d(TAG, "interceptKeyTi keyCode=" + keyCode + " MUTE");   6.audio 静音模式接口 静音调用设置setRingerMode状态 RINGER_MODE_SILENT 静音,且无振动 RINGER_MODE_VIBRATE 静音,但有振动 RINGER_MODE_NORMAL 正常声音 铃响模式的设置是通过mAudioManager(音频管理器)来实现的. mAudioManager所在服务如下: 文件: frameworks/base/media/java/android/media/AudioManager.java     public static final int RINGER_MODE_SILENT = 0;     public static final int RINGER_MODE_VIBRATE = 1;     public static final int RINGER_MODE_NORMAL = 2; public void setRingerMode(int ringerMode) {         IAudioService service = getService();         try {             service.setRingerMode(ringerMode);         } catch (RemoteException e) {             Log.e(TAG, "Dead object in setRingerMode", e);         } } 在拦截静音键或者在apk上接收key值添加相应的控制