以mt6357 pmic为例，充电器插拔检测和类型检测在mt6357-charger-type.c下完成：

一、首先从pmic的probe开始分析：

static int mt6357_charger_type_probe(struct platform_device *pdev)
{struct mtk_charger_type *info;struct iio_channel *chan_vbus;struct device *dev = &pdev->dev;struct device_node *np = dev->of_node;int ret = 0;pr_notice("%s: starts\n", __func__);chan_vbus = devm_iio_channel_get(&pdev->dev, "pmic_vbus");                //dts中pmic_vbus设备节点读取，通过adc读取vcdt引脚上的分压电压（充电器电压）来识别并触发中断，if (IS_ERR(chan_vbus)) {pr_notice("mt6357 charger type requests probe deferral ret:%d\n",chan_vbus);return -EPROBE_DEFER;}info = devm_kzalloc(&pdev->dev, sizeof(*info),GFP_KERNEL);if (!info)return -ENOMEM;info->chip = (struct mt6397_chip *)dev_get_drvdata(                //pmic私有数据获取pdev->dev.parent);info->regmap = info->chip->regmap;dev_set_drvdata(&pdev->dev, info);info->pdev = pdev;mutex_init(&info->ops_lock);check_boot_mode(info, &pdev->dev);info->psy_desc.name = "mtk_charger_type";                //一些私有数据赋值info->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;info->psy_desc.properties = chr_type_properties;info->psy_desc.num_properties = ARRAY_SIZE(chr_type_properties);info->psy_desc.get_property = psy_chr_type_get_property;info->psy_desc.set_property = psy_chr_type_set_property;info->psy_desc.property_is_writeable =psy_charger_type_property_is_writeable;info->psy_desc.usb_types = mt6357_charger_usb_types,info->psy_desc.num_usb_types = ARRAY_SIZE(mt6357_charger_usb_types),info->psy_cfg.drv_data = info;info->psy_cfg.of_node = np;info->psy_cfg.supplied_to = mt6357_charger_supplied_to;info->psy_cfg.num_supplicants = ARRAY_SIZE(mt6357_charger_supplied_to);info->ac_desc.name = "ac";info->ac_desc.type = POWER_SUPPLY_TYPE_MAINS;info->ac_desc.properties = mt_ac_properties;info->ac_desc.num_properties = ARRAY_SIZE(mt_ac_properties);info->ac_desc.get_property = mt_ac_get_property;info->ac_cfg.drv_data = info;info->usb_desc.name = "usb";info->usb_desc.type = POWER_SUPPLY_TYPE_USB;info->usb_desc.properties = mt_usb_properties;info->usb_desc.num_properties = ARRAY_SIZE(mt_usb_properties);info->usb_desc.get_property = mt_usb_get_property;info->usb_cfg.drv_data = info;info->psy = power_supply_register(&pdev->dev, &info->psy_desc,        //注册此pmic设备为psy设备&info->psy_cfg);if (IS_ERR(info->psy)) {pr_notice("%s Failed to register power supply: %ld\n",__func__, PTR_ERR(info->psy));return PTR_ERR(info->psy);}pr_notice("%s register psy success\n", __func__);info->chan_vbus = devm_iio_channel_get(                //再次读取该psy设备信息&pdev->dev, "pmic_vbus");if (IS_ERR_OR_NULL(info->chan_vbus)) {pr_notice("chan_vbus auxadc get fail, ret=%d\n",PTR_ERR(info->chan_vbus));}if (of_property_read_u32(np, "bc12_active", &info->bc12_active) < 0)        //bc1.2使能，bc检测使能pr_notice("%s: no bc12_active\n", __func__);pr_notice("%s: bc12_active:%d\n", __func__, info->bc12_active);if (info->bc12_active) {info->ac_psy = power_supply_register(&pdev->dev,        //注册ac psy设备&info->ac_desc, &info->ac_cfg);if (IS_ERR(info->ac_psy)) {pr_notice("%s Failed to register power supply: %ld\n",__func__, PTR_ERR(info->ac_psy));return PTR_ERR(info->ac_psy);}info->usb_psy = power_supply_register(&pdev->dev,            //注册usb psy设备&info->usb_desc, &info->usb_cfg);if (IS_ERR(info->usb_psy)) {pr_notice("%s Failed to register power supply: %ld\n",__func__, PTR_ERR(info->usb_psy));return PTR_ERR(info->usb_psy);}INIT_WORK(&info->chr_work, do_charger_detection_work);            //这里初始化了一个do_charger_detection_work任务，做插拔检测schedule_work(&info->chr_work);ret = devm_request_threaded_irq(&pdev->dev,                //这里注册了一个chrdet_int_handler中断，触发方式是边沿触发，插入充电器和拔出，首先会执行这个中断函数platform_get_irq_byname(pdev, "chrdet"), NULL,chrdet_int_handler, IRQF_TRIGGER_HIGH, "chrdet", info);if (ret < 0)pr_notice("%s request chrdet irq fail\n", __func__);}info->first_connect = true;pr_notice("%s: done\n", __func__);return 0;
}

下面分解看它的中断函数和检测函数：

二、chrdet_int_handler函数：

irqreturn_t chrdet_int_handler(int irq, void *data)
{struct mtk_charger_type *info = data;unsigned int chrdet = 0;chrdet = bc11_get_register_value(info->regmap,            //bc1.2读取pmic CHRDET寄存器值，来判断是否使能检测充电器PMIC_RGS_CHRDET_ADDR,PMIC_RGS_CHRDET_MASK,PMIC_RGS_CHRDET_SHIFT);if (!chrdet) {hw_bc11_done(info);            //pmic寄存器操作/* 8 = KERNEL_POWER_OFF_CHARGING_BOOT *//* 9 = LOW_POWER_OFF_CHARGING_BOOT */if (info->bootmode == 8 || info->bootmode == 9) {        //boot mode判断，关机充电或者低压充电pr_info("%s: Unplug Charger/USB\n", __func__);#ifndef CONFIG_TCPC_CLASSpr_info("%s: system_state=%d\n", __func__,system_state);if (system_state != SYSTEM_POWER_OFF)kernel_power_off();            //系统下点
#endif}}pr_notice("%s: chrdet:%d\n", __func__, chrdet);do_charger_detect(info, chrdet);                //这里会去做充电器是否在位和类型判断return IRQ_HANDLED;
}

三、do_charger_detection_work：

static void do_charger_detection_work(struct work_struct *data)
{//container_of: 通过已知的一个数据结构成员指针data，数据结构类型mtk_charger_type，以及这个成员指针在这个数据结构中的成员名chr_work，来获取指向这个数据结构的指针mtk_charger_type *struct mtk_charger_type *info = (struct mtk_charger_type *)container_of(            data, struct mtk_charger_type, chr_work);unsigned int chrdet = 0;chrdet = bc11_get_register_value(info->regmap,            //bc1.2读取pmic CHRDET寄存器值，来判断是否使能检测充电器PMIC_RGS_CHRDET_ADDR,PMIC_RGS_CHRDET_MASK,PMIC_RGS_CHRDET_SHIFT);pr_notice("%s: chrdet:%d\n", __func__, chrdet);if (chrdet)do_charger_detect(info, chrdet);            //这里会去做充电器是否在位和类型判断else {hw_bc11_done(info);/* 8 = KERNEL_POWER_OFF_CHARGING_BOOT *//* 9 = LOW_POWER_OFF_CHARGING_BOOT */if (info->bootmode == 8 || info->bootmode == 9) {pr_info("%s: Unplug Charger/USB\n", __func__);#ifndef CONFIG_TCPC_CLASSpr_info("%s: system_state=%d\n", __func__,system_state);if (system_state != SYSTEM_POWER_OFF)kernel_power_off();
#endif}}
}

四、do_charger_detect：

这个函数会在do_charger_detection_work和chrdet_int_handler都去调用，主要是做psy设备状态改变之后的通知动作
;

void do_charger_detect(struct mtk_charger_type *info, bool en)
{union power_supply_propval prop, prop2, prop3;int ret = 0;#ifndef CONFIG_TCPC_CLASSif (!mt_usb_is_device()) {                //通过usb phy识别和确认是usb设备pr_info("charger type: UNKNOWN, Now is usb host mode. Skip detection\n");return;}
#endifprop.intval = en;if (en) {ret = power_supply_set_property(info->psy,            //spy设备online属性设置POWER_SUPPLY_PROP_ONLINE, &prop);ret = power_supply_get_property(info->psy,            //psy类型获取POWER_SUPPLY_PROP_TYPE, &prop2);ret = power_supply_get_property(info->psy,            //usb类型获取POWER_SUPPLY_PROP_USB_TYPE, &prop3);} else {prop2.intval = POWER_SUPPLY_TYPE_UNKNOWN;prop3.intval = POWER_SUPPLY_USB_TYPE_UNKNOWN;info->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;info->type = POWER_SUPPLY_USB_TYPE_UNKNOWN;}pr_notice("%s type:%d usb_type:%d\n", __func__, prop2.intval, prop3.intval);if(en &&(prop3.intval ==1 || prop3.intval ==3)) {            //usb类型mt_usb_connect();} else {mt_usb_disconnect();}power_supply_changed(info->psy);            //这里做psy设备状态更新
}

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mtk充电器插拔检测

一、首先从pmic的probe开始分析：

二、chrdet_int_handler函数：

三、do_charger_detection_work：

四、do_charger_detect：

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