SM4250平台typec耳机检测

主要用到了这么几个文件：wcd-mbhc-v2.c wcd-mbhc-adc.c bengal.c

入口wcd_mbhc_init

 switch (mbhc->mbhc_detection_logic) {case WCD_DETECTION_LEGACY:wcd_mbhc_legacy_init(mbhc);break;case WCD_DETECTION_ADC:wcd_mbhc_adc_init(mbhc);break;default:pr_err("%s: Unknown detection logic type %d\n",__func__, mbhc->mbhc_detection_logic);break;}if (!mbhc->mbhc_fn ||!mbhc->mbhc_fn->wcd_mbhc_hs_ins_irq ||!mbhc->mbhc_fn->wcd_mbhc_hs_rem_irq ||!mbhc->mbhc_fn->wcd_mbhc_detect_plug_type ||!mbhc->mbhc_fn->wcd_cancel_hs_detect_plug) {pr_err("%s: mbhc function pointer is NULL\n", __func__);goto err_mbhc_sw_irq;}ret = mbhc->mbhc_cb->request_irq(component,mbhc->intr_ids->mbhc_sw_intr,wcd_mbhc_mech_plug_detect_irq,"mbhc sw intr", mbhc);if (ret) {pr_err("%s: Failed to request irq %d, ret = %d\n", __func__,mbhc->intr_ids->mbhc_sw_intr, ret);goto err_mbhc_sw_irq;}ret = mbhc->mbhc_cb->request_irq(component,mbhc->intr_ids->mbhc_btn_press_intr,wcd_mbhc_btn_press_handler,"Button Press detect", mbhc);if (ret) {pr_err("%s: Failed to request irq %d\n", __func__,mbhc->intr_ids->mbhc_btn_press_intr);goto err_btn_press_irq;}ret = mbhc->mbhc_cb->request_irq(component,mbhc->intr_ids->mbhc_btn_release_intr,wcd_mbhc_release_handler,"Button Release detect", mbhc);if (ret) {pr_err("%s: Failed to request irq %d\n", __func__,mbhc->intr_ids->mbhc_btn_release_intr);goto err_btn_release_irq;}ret = mbhc->mbhc_cb->request_irq(component,mbhc->intr_ids->mbhc_hs_ins_intr,mbhc->mbhc_fn->wcd_mbhc_hs_ins_irq,"Elect Insert", mbhc);if (ret) {pr_err("%s: Failed to request irq %d\n", __func__,mbhc->intr_ids->mbhc_hs_ins_intr);goto err_mbhc_hs_ins_irq;}mbhc->mbhc_cb->irq_control(component, mbhc->intr_ids->mbhc_hs_ins_intr,false);clear_bit(WCD_MBHC_ELEC_HS_INS, &mbhc->intr_status);ret = mbhc->mbhc_cb->request_irq(component,mbhc->intr_ids->mbhc_hs_rem_intr,mbhc->mbhc_fn->wcd_mbhc_hs_rem_irq,"Elect Remove", mbhc);if (ret) {pr_err("%s: Failed to request irq %d\n", __func__,mbhc->intr_ids->mbhc_hs_rem_intr);goto err_mbhc_hs_rem_irq;}mbhc->mbhc_cb->irq_control(component, mbhc->intr_ids->mbhc_hs_rem_intr,false);clear_bit(WCD_MBHC_ELEC_HS_REM, &mbhc->intr_status);ret = mbhc->mbhc_cb->request_irq(component,mbhc->intr_ids->hph_left_ocp,wcd_mbhc_hphl_ocp_irq, "HPH_L OCP detect",mbhc);if (ret) {pr_err("%s: Failed to request irq %d\n", __func__,mbhc->intr_ids->hph_left_ocp);goto err_hphl_ocp_irq;}ret = mbhc->mbhc_cb->request_irq(component,mbhc->intr_ids->hph_right_ocp,wcd_mbhc_hphr_ocp_irq, "HPH_R OCP detect",mbhc);if (ret) {pr_err("%s: Failed to request irq %d\n", __func__,mbhc->intr_ids->hph_right_ocp);goto err_hphr_ocp_irq;}mbhc->deinit_in_progress = false;pr_debug("%s: leave ret %d\n", __func__, ret);return ret;

1.初始化wcd-mbhc-adc.c里的wcd_mbhc_adc_init：主要INIT_WORK(&mbhc->correct_plug_swch, wcd_correct_swch_plug);创建一个任务队列纠正当前类型。

2.注册了七个中断。

wcd_mbhc_mech_plug_detect_irq ----耳机中断，无论怎么插耳机必走

wcd_mbhc_btn_press_handler ----按键按下中断

wcd_mbhc_release_handler ----按键松开中断

wcd_mbhc_hs_ins_irq ----选择插入中断（一般插着typec转接线再插耳机会触发）WCD_MBHC_ELEC_HS_INS是标志位，通过wcd_mbhc_hs_elec_irq(mbhc, WCD_MBHC_ELEC_HS_INS, false);打开或者关闭这个中断。

wcd_mbhc_hs_rem_irq ----选择拔出中断，同上。

 do {retry++;/** read output_mv every 10ms to look for* any change in IN2_P*/usleep_range(10000, 10100);output_mv = wcd_measure_adc_once(mbhc, MUX_CTL_IN2P);pr_debug("%s: Check for fake removal: output_mv %d\n",__func__, output_mv);if ((output_mv <= adc_threshold) &&retry > FAKE_REM_RETRY_ATTEMPTS) {pr_debug("%s: headset is NOT actually removed\n",__func__);goto exit;}} while (!time_after(jiffies, timeout));

有时候micbiae电压变化也会发出拔出中断，可以提高WCD_MBHC_ADC_HS_THRESHOLD_MV的值，比如2200。

最后bengal.c里.detect_extn_cable = true代表检测外部的连接线，会把WCD_MBHC_ELEC_HS_INS和WCD_MBHC_ELEC_HS_REM赋值为true，打开第4、5个中断。反之关掉这俩中断。

SM4250平台typec耳机检测相关推荐

mtk平台typec模拟耳机补丁
typec模拟耳机在某些高端手机上已经很常见了,但拿到的代码默认不支持typec模拟耳机(在某些平台上默认就是typec模拟耳机),那只能自己修改了. 这里用的版本为Android11,kernel4 ...
android type c 耳机检测,USB Type-C 的新音频标准将帮助 Android 设备去掉 3.5mm 耳机孔...
原标题:USB Type-C 的新音频标准将帮助 Android 设备去掉 3.5mm 耳机孔苹果往往能够带领硬件行业的一个潮流,虽然在刚开始的时候,充满争议.但随着 iPhone 7 正式去除 3 ...
typec耳机知识介绍
数字耳机和模拟耳机模拟耳机即我们的常见的3.5mm接口的耳机,包括左右声道,地或者mic,如左图. 数字耳机(右图)包含一个usb声卡+DAC&&ADC+amp+模拟耳机,当数字耳机 ...
小知识·typec耳机原理
目录数字耳机和模拟耳机手机中模拟和数字耳机的差异 typec耳机介绍数字耳机和模拟耳机模拟耳机即我们的常见的3.5mm接口的耳机,包括左右声道,地或者mic,如左图. 数字耳机(右图)包含一个 ...
typec耳机知识介绍-数字耳机，模拟耳机
数字耳机和模拟耳机模拟耳机即我们的常见的3.5mm接口的耳机,包括左右声道,地或者mic,如左图. 数字耳机(右图)包含一个usb声卡+DAC&&ADC+amp+模拟耳机,当数字耳机 ...
ALSA子系统（十七）------支持Type-C耳机驱动
你好!这里是风筝的博客, 欢迎和我一起交流. 之前讲解了耳机驱动: ALSA子系统(十六)------虚拟耳机驱动 Android音频子系统(四)------耳机拔插流程那么必然少不了现在市场上较多 ...
Android 耳机检测原理介绍
前言欢迎大家我分享和推荐好用的代码段~~ 声明欢迎转载,但请保留文章原始出处: CSDN:http://www.csdn.net ...
高通平台的耳机检测(msm8909)
记录高通msm8909耳机检测的机制,相关代码 kernel/arch/arm/boot/dts/qcom/msm8909-qrd-skuc.dtsi sound { compatib ...
Android Switch驱动的耳机检测
在 Android 中添加了一个 switch 驱动,用于监测一些开关的变化,例如:HDMI.耳机的插拔检测之类的. 驱动源码存在内核源码的 drivers/switch 中,目录下有两个主要文件:s ...

SM4250平台typec耳机检测

SM4250平台typec耳机检测相关推荐

最新文章

热门文章