1. 首先驱动需要先获取到2个power supply

kernel\msm-3.18\drivers\usb\phy\phy-msm-usb.c

motg->usb_psy.name = "usb";
motg->usb_psy.type = POWER_SUPPLY_TYPE_USB;
motg->usb_psy.supplied_to = otg_pm_power_supplied_to;
motg->usb_psy.num_supplicants = ARRAY_SIZE(otg_pm_power_supplied_to);
motg->usb_psy.properties = otg_pm_power_props_usb;
motg->usb_psy.num_properties = ARRAY_SIZE(otg_pm_power_props_usb);
motg->usb_psy.get_property = otg_power_get_property_usb;
motg->usb_psy.set_property = otg_power_set_property_usb;
motg->usb_psy.property_is_writeable
    = otg_power_property_is_writeable_usb;

if (!msm_otg_register_power_supply(pdev, motg))
    psy = &motg->usb_psy;

kernel\msm-3.18\drivers\power\bq2570x\bq2570x_charger.c

    usb_psy = power_supply_get_by_name("usb");

static int bq2570x_psy_register(struct bq2570x *bq)
{
    int ret;

    bq->batt_psy.name = "dc_o2";
    bq->batt_psy.type = POWER_SUPPLY_TYPE_BATTERY;
    bq->batt_psy.properties = bq2570x_charger_props;
    bq->batt_psy.num_properties = ARRAY_SIZE(bq2570x_charger_props);
    bq->batt_psy.get_property = bq2570x_charger_get_property;
    bq->batt_psy.set_property = bq2570x_charger_set_property;
    bq->batt_psy.external_power_changed = bq2570x_external_power_changed;
    bq->batt_psy.property_is_writeable = bq2570x_charger_is_writeable;

    ret = power_supply_register(bq->dev, &bq->batt_psy);
    if (ret < 0) {
        pr_err("failed to register batt_psy:%d\n", ret);
        return ret;
    }

    return 0;
}

1. 充电的闪电图标和充电动画启动逻辑

闪电图标启动逻辑：POWER_SUPPLY_TYPE_USB的power supply上报USB类型(CDP,DCP,USB)

power_supply_set_supply_type(bq->usb_psy, POWER_SUPPLY_TYPE_USB);
ret = power_supply_set_online(bq->usb_psy, true);
power_supply_changed(bq->usb_psy);

充电动画的启动逻辑：POWER_SUPPLY_TYPE_BATTERY的power supply上报充电状态(CHARGE_STATE_NOT_CHARGING，CHARGE_STATE_FASTCHARGE)

bq->charge_state = CHARGE_STATE_FASTCHARGE;
power_supply_changed(&bq->batt_psy);

1. 利用dumpsys分析当前battery 状态

V2_PRO:/ # dumpsys battery
Current Battery Service state:
  AC powered: false
  USB powered: true
  Wireless powered: false
  Max charging current: 0
  Max charging voltage: 0
  Charge counter: 0
  status: 2
  health: 2
  present: true
  level: 46
  scale: 100
  voltage: 7
  temperature: 270
  technology: Li-ion

如上主要关注2个字段：

USB powered : true

那么闪电图标应该会出现

status: 2
那么充电动画应该启动了

同时我们还可以通过shell指令的方式启动充电图标和充电动画

dumpsys battery set usb 1

闪电图标应该会出现

dumpsys battery set status 2

充电动画应该启动了

dumpsys battery set usb 0

闪电图标消失

dumpsys battery set status 4

充电动画消失

Android 开机充电图标和充电动画