sprd_battery.c 是充电驱动，这个是充电功能的核心内容，电量显示策略、温度检测策略、充电保护机制等功能在这里实现，功能实现与硬件细节剥离，调用通用接口实现逻辑控制；
1 sprdbat_probe函数：
代码语言：javascript复制static int sprdbat_probe(struct platform_device *pdev)
{
int ret = -ENODEV;
enum usb_charger_state usb_online_state = USB_CHARGER_DEFAULT;
struct power_supply *ret_ptr = NULL;
struct sprdbat_drivier_data *data = NULL;
struct device_node *np = pdev->dev.of_node;
struct power_supply_desc *battery_desc = NULL,
*ac_desc = NULL, *usb_desc = NULL;
struct power_supply_config battery_cfg = {}, ac_cfg = {}, usb_cfg = {};
if (!np) {
dev_err(&pdev->dev, "device node not foundn");
return -EINVAL;
}
if (sprd_ext_ic_op == NULL) {
dev_err(&pdev->dev, "sprd_ext_ic_op not foundn");
return -EINVAL;
}
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (data == NULL) {
ret = -ENOMEM;
goto err_data_alloc_failed;
}
data->pdata = sprdbat_parse_dt(pdev);
if (IS_ERR_OR_NULL(data->pdata))
return -ENOMEM;
data->dev = &pdev->dev;
platform_set_drvdata(pdev, data);
sprdbat_data = data;
//通过ADC获取温度
data->pdata->channel_temp = iio_channel_get(data->dev, "adc_temp");
if (IS_ERR(data->pdata->channel_temp)) {
ret = PTR_ERR(data->pdata->channel_temp);
goto err_iio_get_temp;
}
//通过ADC获取vbat电压
data->pdata->channel_vbat = iio_channel_get(data->dev, "adc_vbat");
if (IS_ERR(data->pdata->channel_vbat)) {
ret = PTR_ERR(data->pdata->channel_vbat);
goto err_iio_get_vbat;
}
//通过ADC获取充电电压
data->pdata->channel_vchg = iio_channel_get(data->dev, "adc_vchg");
if (IS_ERR(data->pdata->channel_vchg)) {
ret = PTR_ERR(data->pdata->channel_vchg);
goto err_iio_get_vchg;
}
print_pdata(sprdbat_data->pdata);
battery_desc = devm_kzalloc(&pdev->dev,
sizeof(struct power_supply_desc), GFP_KERNEL);
if (battery_desc == NULL) {
ret = -ENOMEM;
goto err_desc_alloc_failed;
}
//注册battery 的power_supply接口，这个为上层提供电量、充电状态等的接口
battery_desc->properties = sprdbat_battery_props;
battery_desc->num_properties = ARRAY_SIZE(sprdbat_battery_props);
battery_desc->get_property = sprdbat_battery_get_property;
battery_desc->set_property = sprdbat_battery_set_property;
battery_desc->property_is_writeable =
sprdbat_battery_property_is_writeable;
battery_desc->name = "battery";
battery_desc->type = POWER_SUPPLY_TYPE_BATTERY;
battery_desc->no_thermal = true;
battery_cfg.drv_data = sprdbat_data;
ac_desc = devm_kzalloc(&pdev->dev,
sizeof(struct power_supply_desc), GFP_KERNEL);
if (ac_desc == NULL) {
ret = -ENOMEM;
goto err_desc_alloc_failed;
}
ac_desc->properties = sprdbat_ac_props;
ac_desc->num_properties = ARRAY_SIZE(sprdbat_ac_props);
ac_desc->get_property = sprdbat_ac_get_property;
ac_desc->set_property = sprdbat_ac_set_property;
ac_desc->property_is_writeable =
sprdbat_ac_property_is_writeable;
//注册AC的充电power_supply接口
ac_desc->name = "ac";
ac_desc->type = POWER_SUPPLY_TYPE_MAINS;
ac_desc->no_thermal = true;
ac_cfg.drv_data = sprdbat_data;
//usb接口的接口
usb_desc = devm_kzalloc(&pdev->dev,
sizeof(struct power_supply_desc), GFP_KERNEL);
if (usb_desc == NULL) {
ret = -ENOMEM;
goto err_desc_alloc_failed;
}
usb_desc->properties = sprdbat_usb_props;
usb_desc->num_properties = ARRAY_SIZE(sprdbat_usb_props);
usb_desc->get_property = sprdbat_usb_get_property;
usb_desc->name = "usb";
usb_desc->type = POWER_SUPPLY_TYPE_USB;
usb_desc->no_thermal = true;
usb_cfg.drv_data = sprdbat_data;
data->start_charge = sprdbat_start_charge;
data->stop_charge = sprdbat_stop_charge;
ret_ptr = power_supply_register(&pdev->dev, battery_desc, &battery_cfg);
if (IS_ERR(ret_ptr)) {
goto err_battery_failed;
} else {
data->battery = ret_ptr;
data->battery->supplied_to = battery_supply_list;
data->battery->num_supplicants =
ARRAY_SIZE(battery_supply_list);
}
ret_ptr = power_supply_register(&pdev->dev, ac_desc, &ac_cfg);
if (IS_ERR(ret_ptr)) {
goto err_ac_failed;
} else {
data->ac = ret_ptr;
data->ac->supplied_to = supply_list;
data->ac->num_supplicants = ARRAY_SIZE(supply_list);
}
ret_ptr = power_supply_register(&pdev->dev, usb_desc, &usb_cfg);
if (IS_ERR(ret_ptr)) {
goto err_usb_failed;
} else {
data->usb = ret_ptr;
data->usb->supplied_to = supply_list;
data->usb->num_supplicants = ARRAY_SIZE(supply_list);
}
/*
* TODO: switch polling to interrupt again need open this code.
* data->chg_nb.notifier_call = sprdbat_chg_event_call;
* ret = power_supply_reg_notifier(&data->chg_nb);
*
* if (ret)
* dev_err(data->dev, "failed to reg notifier: %dn", ret);
*/
//注册文件节点
ret = sysfs_create_group(&data->battery->dev.kobj,
&sprd_bat_group);
if (ret) {
dev_err(&pdev->dev,
"failed to create sprd_bat sysfs device attributesn");
goto err_sysfs_create_gr;
}
//vbat检测脚
data->gpio_vbat_detect = data->pdata->gpio_vbat_detect;
if (data->gpio_vbat_detect > 0) {
devm_gpio_request(&pdev->dev,
data->gpio_vbat_detect, "vbat_detect");
gpio_direction_input(data->gpio_vbat_detect);
data->irq_vbat_detect = gpio_to_irq(data->gpio_vbat_detect);
irq_set_status_flags(data->irq_vbat_detect, IRQ_NOAUTOEN);
ret =
devm_request_threaded_irq(&pdev->dev,
data->irq_vbat_detect, NULL,
sprdbat_vbat_detect_irq,
IRQ_TYPE_LEVEL_LOW | IRQF_NO_SUSPEND,
"sprdbat_vbat_detect", data);
if (ret)
dev_err(&pdev->dev, "failed to use vbat gpio: %dn",
ret);
}
//otg 使能管脚
data->gpio_otg_en = data->pdata->gpio_otg_en;
if (data->gpio_otg_en > 0) {
devm_gpio_request(&pdev->dev,
data->gpio_otg_en, "otg_en");
ret = gpio_direction_output(data->gpio_otg_en, 0);
if (ret)
dev_err(&pdev->dev, "failed to use otg_en gpio: %dn",
ret);
}
data->bat_info.bat_present = 1;
mutex_init(&data->lock);
//充电睡眠唤醒锁
wake_lock_init(&(data->charger_wake_lock), WAKE_LOCK_SUSPEND,
"charger_wake_lock");
//初始化电池工作队列
INIT_DELAYED_WORK(&data->battery_work, sprdbat_battery_works);
//初始化电池睡眠队列
INIT_DELAYED_WORK(&data->battery_sleep_work,
sprdbat_battery_sleep_works);
//初始化电池检测中断的队列
INIT_WORK(&data->vbat_detect_irq_work, sprdbat_vbat_detect_irq_works);
//电池拔插队列
INIT_WORK(&data->plug_work, sprdbat_plug_works);
//电池充电队列
INIT_DELAYED_WORK(&sprdbat_data->sprdbat_charge_work,
sprdbat_charge_works);
data->monitor_wqueue = create_freezable_workqueue("sprdbat_monitor");
if (data->monitor_wqueue == NULL)
goto err_create_wq;
//充电初始化
sprdchg_init(data->pdata);
//库仑计的初始化
sprdfgu_init(data->pdata);
if (sprdchg_timer_op->timer_request)
sprdchg_timer_op->timer_request(sprdbat_timer_handler,
data->pdata);
else
SPRDBAT_DEBUG("warning !!charge timer ops = nulln");
//充电led的控制
#ifdef CONFIG_LEDS_TRIGGERS
data->charging_led.name = "sprdbat_charging_led";
data->charging_led.default_trigger = "battery-charging";
data->charging_led.brightness_set = sprdchg_led_brightness_set;
ret = led_classdev_register(&pdev->dev, &data->charging_led);
if (ret)
goto err_led_reg;
#endif
sprd_ext_ic_op->ic_init(sprdbat_data);
sprdbat_info_init(data);
SPRDBAT_DEBUG("register_usb_notifiern");
//注册usb插拔的回调函数
sprdbat_data->usb_charger =
usb_charger_find_by_name("usb-charger.0");
if (IS_ERR(sprdbat_data->usb_charger)) {
ret = -EPROBE_DEFER;
dev_err(&pdev->dev,
"Failed to find USB gadget: %dn", ret);
goto err_usb_find_name;
}
//这个函数实质上回调了工作队列plug_work，也就是调用了sprdbat_plug_works
sprdbat_data->chg_usb_nb.notifier_call = sprdbat_usb_plug_event;
ret = usb_charger_register_notify(sprdbat_data->usb_charger,
&sprdbat_data->chg_usb_nb);
if (ret != 0) {
dev_err(&pdev->dev,
"Failed to register notifier: %dn", ret);
goto err_usb_reg_notify;
}
sprdbat_data->usb_charger->get_charger_type =
sprdchg_charger_is_adapter_for_usb;
//获取usb的状态
usb_online_state = usb_charger_get_state(sprdbat_data->usb_charger);
if (usb_online_state == USB_CHARGER_PRESENT)
queue_work(sprdbat_data->monitor_wqueue,
&sprdbat_data->plug_work);
if (data->gpio_vbat_detect > 0)
enable_irq(sprdbat_data->irq_vbat_detect);
queue_delayed_work(system_power_efficient_wq,
&data->battery_work, 15 * HZ);
SPRDBAT_DEBUG("sprdbat_probe----------endn");
return 0;
err_usb_reg_notify:
err_usb_find_name:
#ifdef CONFIG_LEDS_TRIGGERS
led_classdev_unregister(&data->charging_led);
err_led_reg:
#endif
destroy_workqueue(data->monitor_wqueue);
err_create_wq:
sysfs_remove_group(&data->battery->dev.kobj,
&sprd_bat_group);
err_sysfs_create_gr:
power_supply_unregister(data->usb);
err_usb_failed:
power_supply_unregister(data->ac);
err_ac_failed:
power_supply_unregister(data->battery);
err_battery_failed:
iio_channel_release(data->pdata->channel_vchg);
err_desc_alloc_failed:
sprdbat_data = NULL;
err_iio_get_vchg:
iio_channel_release(data->pdata->channel_vbat);
err_iio_get_vbat:
iio_channel_release(data->pdata->channel_temp);
err_iio_get_temp:
err_data_alloc_failed:
sprdbat_data = NULL;
return ret;
}1.1 解析设备树：
sprdbat_parse_dt函数如下：
代码语言：javascript复制battery-adapt-fun：电池兼容函数索引0 即为电池 ID识别
battery-adapt-support:电池兼容开关
charger-det-gpios：充电检测管脚
otg-en-gpios：otg使能管脚
chg-end-vol-check：检查充电是否满的电压（单位为mv）
chg-bat-safety-vol：充电时蓄电池的安全电压
rechg-vol：注意这里可以去掉复充电压
adp-cdp-cur：cdp充电电流（单位为ma）
adp-dcp-cur：dcp充电电流（单位为ma）
adp-sdp-cur ：sdp充电电流（单位为ma）
adp-unknown-cur：未知充电电流
adp-fchg-cur：快充充电电流
adp-cdp-cur-limit：用于POWER_SUPPLY_PROP_CURRENT_MAX节点，为CDP类型的最大限制
adp-dcp-cur-limit：为DCP类型的最大限制
adp-unknown-cur-limit:为unknown类型的最大限制
adp-fchg-cur-limit：为快充类型的最大限制
ovp-stop：过电压保护：停止充电电压（mv）
ovp-restart：过电压保护：过压恢复电压
fchg-ovp-stop：快充过电压保护：停止充电电压（mv）
fchg-ovp-restart：快充过电压保护：重启充电电压（mv）
chg-timeout ：充电超时，最终在函数sprdbat_is_chg_timeout调用到
chg-rechg-timeout：复充超时
trickle-timeout：涓流超时
chg-end-cur：充电端电流
chg-polling-time：充电状态检查周期（单位：s）
chg-polling-time-fast：
cap-one-per-time：每个百分比变化最短时间
cap-valid-range-poweron：应该是保存的电池容量，不确定，设备树里暂时没有用到过
temp-support：温度检测开关
temp-comp-res：读取温度补偿电阻器
only-vol-mode：获取电池容量模式，仅电压模式
fgu-mode：库仑计模式
chg-full-condition：满电判断条件电流电压或者外置 IC
alm_soc：暂且没看到用的地方
soft-vbat-uvlo ：低电压关机
rint:电池内阻
cnom：电池容量
rsense-real：fgu 对地电阻真实阻抗
rsense-spec：fgu 对地电阻真实理论值
relax-current：进入 relax 模式下的电流值
fgu-cal-ajust：fgu校准偏移
temp-tab-val：ntc电阻表电压
charge-vol-tab：对应charge-vol-tab-cap，电压对应电量，只有电压测量方式
charge-vol-tab-cap：电量表
ocv-tab-vol：开路电压测量对应ocv-tab-cap
ocv-tab-cap：电量表
discharge-vol-tab：未充电的开路电压表，只有电压测量方式
discharge-vol-tab-cap：电量表
JEITA 功能：可以根据温度，提供动态修正充电电流及恒压电压的功能
jeita-temp-tab 设置的对应温度点
为调整点对充电电流及恒压电压做调整；jeita-temp-recovery-tab 设置的温度点为温区恢复点；
温度变化到更高或者更低区间后如果恢复回来有 3℃的缓冲区
每个区间对应的电流值和电压值在 jeita-cur-tab 和 jeita-cccv-tab
cnom-temp-tab：电池容量和温度的表格，
rint-temp-tab：电池内阻和温度的表格2. 各个工作队列的作用：
2.1 sprdbat_battery_works函数
这个函数是在probe函数中最后调用到的，也就是一开始probe的时候就会调用到的
代码语言：javascript复制static void sprdbat_battery_works(struct work_struct *work)
{
SPRDBAT_DEBUG("sprdbat_battery_worksn");
mutex_lock(&sprdbat_data->lock);
//由设备树可知，only_vol_mode是不存在的，所以读取vbat的电压和开路电压
if (!sprdbat_data->pdata->only_vol_mode) {
sprdbat_data->bat_info.vbat_vol = sprdbat_read_vbat_vol();
sprdbat_data->bat_info.vbat_ocv = sprdfgu_read_vbat_ocv();
}
//更新电池信息里的温度
sprdbat_data->bat_info.last_temp =
sprdbat_data->bat_info.cur_temp;
if (jeita_debug_enable)
sprdbat_data->bat_info.cur_temp = jeita_debug;
else
sprdbat_data->bat_info.cur_temp = sprdbat_read_temp();
//读取现在库仑计读数
sprdbat_data->bat_info.bat_current = sprdfgu_read_batcurrent();
//读取充电电压
sprdbat_data->bat_info.vchg_vol = sprdchg_read_vchg_vol();
//读取现在充电平均电压
sprdbat_data->bat_info.avg_chg_vol =
sprdbat_get_avgval_from_buff(sprdbat_data->bat_info.vchg_vol,
chg_vol_buff, VOL_BUFF_CNT, 0);
//读取现在库仑计平均读数
sprdbat_data->bat_info.bat_current_avg =
sprdbat_get_avgval_from_buff(sprdbat_data->bat_info.bat_current,
current_buff, CUR_BUFF_CNT, 1);
if (sprdbat_data->pdata->only_vol_mode) {
if (sprdbat_data->bat_info.module_state ==
POWER_SUPPLY_STATUS_DISCHARGING ||
sprdbat_data->bat_info.module_state ==
POWER_SUPPLY_STATUS_UNKNOWN) {
sprdbat_data->bat_info.vbat_vol =
sprdbat_read_vbat_vol();
sprdbat_data->bat_info.vbat_ocv =
sprdfgu_read_vbat_ocv();
sprdbat_update_capacty();
}
} else {
//更新电池电量
sprdbat_update_capacty();
}
mutex_unlock(&sprdbat_data->lock);
sprdbat_print_battery_log();
//不断轮询
queue_delayed_work(system_power_efficient_wq,
&sprdbat_data->battery_work,
15 * HZ);
}其中函数sprdbat_update_capacty更新电池电量：
代码语言：javascript复制static void sprdbat_update_capacty(void)
{
uint32_t fgu_capacity;
int flush_time = 0;
int period_time = 0;
struct timespec64 cur_time;
int chging_flag;
if (sprdbat_data->bat_info.capacity == ~0U)
return;
if (sprdbat_data->pdata->only_vol_mode) {
if (sprdbat_data->bat_info.module_state ==
POWER_SUPPLY_STATUS_CHARGING)
chging_flag = 1;
else
chging_flag = 0;
fgu_capacity = sprdfgu_only_vol_read_capacity(chging_flag);
} else {
fgu_capacity = sprdfgu_read_capacity();
}
cur_time = ktime_to_timespec64(ktime_get_boottime());
if (POWER_SUPPLY_STATUS_CHARGING ==
sprdbat_data->bat_info.module_state) {
if (sprdbat_data->bat_info.capacity >= 99) {
trickle_time = cur_time.tv_sec -
trickle_s_time;
} else {
trickle_s_time = cur_time.tv_sec;
trickle_time = 0;
}
} else {
//直接进入到这里
//涓流时间trickle_s_time=现在时间
trickle_s_time = cur_time.tv_sec;
//trickle_time = 涓流超时时间 周期变化时间 1
trickle_time = sprdbat_data->pdata->trickle_timeout
sprdbat_data->pdata->cap_one_per_time 1;
}
SPRDBAT_DEBUG("trickle_s_time: = %lld,trickle_time: = %dn",
trickle_s_time, trickle_time);
//刷新时间 = 现在时间 - 电量变化时间
//sprdbat_update_capacity_time这个时间会在fgu_capacity ！= sprdbat_data->bat_info.capacity产生变化
flush_time =
(int)(cur_time.tv_sec -
sprdbat_data->sprdbat_update_capacity_time);
//周期时间为每次调用sprdbat_update_capacty的cur_time-上一次调用该函数的时间
period_time =
(int)(cur_time.tv_sec -
sprdbat_data->sprdbat_last_query_time);
sprdbat_data->sprdbat_last_query_time = cur_time.tv_sec;
SPRDBAT_DEBUG("fgu_cap: = %d,flush: = %d,period:=%dn",
fgu_capacity, flush_time, period_time);
//根据不同状态来确定充电时间：
switch (sprdbat_data->bat_info.module_state) {
case POWER_SUPPLY_STATUS_CHARGING:
//如果是充电状态，但是计算出来的电量跟上一次的小，那就属于不正常的情况
if (fgu_capacity < sprdbat_data->bat_info.capacity) {
//电流大于0，避免下降
if (sprdfgu_read_batcurrent() >= 0) {
pr_info("avoid vol jumpingn");
fgu_capacity = sprdbat_data->bat_info.capacity;
} else {
//假设周期时间小于最大更新时间，则正常减1
if (period_time <
sprdbat_data->pdata->cap_one_per_time) {
fgu_capacity =
sprdbat_data->bat_info.capacity - 1;
SPRDBAT_DEBUG
("cap decrease fgu_cap:=%dn",
fgu_capacity);
}
//精度化一下电量
if ((sprdbat_data->bat_info.capacity -
fgu_capacity) >=
(flush_time /
sprdbat_data->pdata->cap_one_per_time)) {
fgu_capacity =
sprdbat_data->bat_info.capacity -
flush_time /
sprdbat_data->pdata->
cap_one_per_time;
}
}
} else if (fgu_capacity > sprdbat_data->bat_info.capacity) {
//假设周期时间小于最大更新时间，则正常加1
if (period_time < sprdbat_data->
pdata->cap_one_per_time) {
fgu_capacity =
sprdbat_data->bat_info.capacity 1;
SPRDBAT_DEBUG
("avoid jumping! fgu_cap: = %dn",
fgu_capacity);
}
//精度化一下电量
if ((fgu_capacity - sprdbat_data->bat_info.capacity) >=
(flush_time /
sprdbat_data->pdata->cap_one_per_time)) {
fgu_capacity =
sprdbat_data->bat_info.capacity
flush_time /
sprdbat_data->pdata->cap_one_per_time;
}
}
//我认为是还未更新到正常电量，但是adc算出的已经是100，但这时候显示的是99；
if ((sprdbat_data->bat_info.capacity != 100)
&& (fgu_capacity >= 100)) {
fgu_capacity = 99;
}
//涓流充电流程
if ((sprdbat_data->bat_info.capacity >= 99) &&
(trickle_time >= sprdbat_data->pdata->trickle_timeout) &&
(sprdbat_data->pdata->trickle_timeout > 0)) {
SPRDBAT_DEBUG("cap is full, but charge continuen");
sprdbat_change_module_state
(SPRDBAT_CHARGING_TO_FULL_E);
}
//低电量关机
if (sprdbat_data->bat_info.vbat_vol <=
(sprdbat_data->pdata->soft_vbat_uvlo -
SPRDBAT_SHUTDOWN_OFSSET)) {
fgu_capacity = 0;
SPRDBAT_DEBUG("soft uvlo, shutdown by kernel.. vol:%d",
sprdbat_data->bat_info.vbat_vol);
orderly_poweroff(true);
}
break;
case POWER_SUPPLY_STATUS_NOT_CHARGING:
case POWER_SUPPLY_STATUS_DISCHARGING:
//未充电状态不应该是计算出来的电量大于原来的电量，所以继续保持原来的电量
if (fgu_capacity >= sprdbat_data->bat_info.capacity) {
fgu_capacity = sprdbat_data->bat_info.capacity;
} else {
//否则则慢慢下降
if (period_time < sprdbat_data->
pdata->cap_one_per_time) {
fgu_capacity =
sprdbat_data->bat_info.capacity - 1;
SPRDBAT_DEBUG
("avoid jumping! fgu_capacity: = %dn",
fgu_capacity);
}
//同样也是精度化
if ((sprdbat_data->bat_info.capacity - fgu_capacity) >=
(flush_time /
sprdbat_data->pdata->cap_one_per_time)) {
fgu_capacity =
sprdbat_data->bat_info.capacity -
flush_time /
sprdbat_data->pdata->cap_one_per_time;
}
}
break;
case POWER_SUPPLY_STATUS_FULL:
//展讯平台是根据电量来复充的
sprdbat_data->sprdbat_update_capacity_time = cur_time.tv_sec;
//假设计算出来的电压小于复充电压-150且不在充电的情况
if ((sprdbat_data->bat_info.vbat_ocv <
(sprdbat_data->pdata->rechg_vol - 150))
&& sprdfgu_read_batcurrent() < 0) {
SPRDBAT_DEBUG("vbat_ocv < rechg_vol -150n");
//从满电状态转换为充电状态
sprdbat_change_module_state(SPRDBAT_FULL_TO_CHARGING_E);
}
//电量保持100%
if (fgu_capacity != 100)
fgu_capacity = 100;
if (sprdbat_data->bat_info.vbat_vol <=
(sprdbat_data->pdata->soft_vbat_uvlo -
SPRDBAT_SHUTDOWN_OFSSET)) {
fgu_capacity = 0;
SPRDBAT_DEBUG
("soft uvlo, shutdown by kernel status fulln");
SPRDBAT_DEBUG("vol:%d",
sprdbat_data->bat_info.vbat_vol);
orderly_poweroff(true);
}
break;
default:
break;
}
//低电压关机
if (sprdbat_data->bat_info.vbat_vol <=
sprdbat_data->pdata->soft_vbat_uvlo) {
fgu_capacity = 0;
SPRDBAT_DEBUG("soft uvlo, vbat very low,level..0.. vol:%d",
sprdbat_data->bat_info.vbat_vol);
}
//更新时间状态，并且用power_supply_changed给上层切换状态
if (fgu_capacity != sprdbat_data->bat_info.capacity) {
sprdbat_data->bat_info.capacity = fgu_capacity;
sprdbat_data->sprdbat_update_capacity_time = cur_time.tv_sec;
sprdfgu_record_cap(sprdbat_data->bat_info.capacity);
power_supply_changed(sprdbat_data->battery);
} else {
if (sprdbat_data->bat_info.cur_temp !=
sprdbat_data->bat_info.last_temp)
power_supply_changed(sprdbat_data->battery);
}
}2.2 sprdbat_battery_sleep_works函数
此函数是为了唤醒电量计算的功能，在sprdbat_resume函数调用：
static void sprdbat_battery_sleep_works(struct work_struct *work)
{
SPRDBAT_DEBUG("sprdbat_battery_sleep_worksn");
if (!queue_delayed_work(system_power_efficient_wq,
&sprdbat_data->battery_work, 0)) {
cancel_delayed_work_sync(&sprdbat_data->battery_work);
queue_delayed_work(system_power_efficient_wq,
&sprdbat_data->battery_work, 0);
}
}其本质意义就是重新调用电池计算的功能定时器；
2.3 sprdbat_vbat_detect_irq_works函数：
此函数是在sprdbat_vbat_detect_irq中断检测到调用的：
当vbat检测管脚为低电量时，则进入该中断
代码语言：javascript复制devm_request_threaded_irq(&pdev->dev,
data->irq_vbat_detect, NULL,
sprdbat_vbat_detect_irq,
IRQ_TYPE_LEVEL_LOW | IRQF_NO_SUSPEND,
"sprdbat_vbat_detect", data);
static __used irqreturn_t sprdbat_vbat_detect_irq(int irq, void *dev_id)
{
disable_irq_nosync(sprdbat_data->irq_vbat_detect);
SPRDBAT_DEBUG("battery detect handle!!!!n");
queue_work(sprdbat_data->monitor_wqueue,
&sprdbat_data->vbat_detect_irq_work);
return IRQ_HANDLED;
}sprdbat_vbat_detect_irq_works函数：
代码语言：javascript复制static void sprdbat_vbat_detect_irq_works(struct work_struct *work)
{
int value;
value = gpio_get_value(sprdbat_data->gpio_vbat_detect);
SPRDBAT_DEBUG("bat_detect value:0x%xn", value);
mutex_lock(&sprdbat_data->lock);
//假设高电平进入此中断，那属于不正常的情况
if (value) {
if (!sprdbat_data->bat_info.bat_present) {
sprdbat_data->bat_info.bat_present = 1;
//电池拔出后重新插入
sprdbat_change_module_state
(SPRDBAT_CHG_UNSPEC_RESTART_E);
//假设是不是在非充电状态
if (POWER_SUPPLY_STATUS_DISCHARGING !=
sprdbat_data->bat_info.module_state)
sprdbat_data->start_charge();
SPRDBAT_DEBUG("vbat_detect-start_charge!!!!n");
}
irq_set_irq_type(sprdbat_data->irq_vbat_detect,
IRQ_TYPE_LEVEL_LOW);
} else {
//电池拔出
sprdbat_data->bat_info.bat_present = 0;
sprdbat_change_module_state(SPRDBAT_CHG_UNSPEC_E);
//停止充电
sprdbat_data->stop_charge();
SPRDBAT_DEBUG("vbat_detect-stop_charge!!!!n");
irq_set_irq_type(sprdbat_data->irq_vbat_detect,
IRQ_TYPE_LEVEL_HIGH);
}
enable_irq(sprdbat_data->irq_vbat_detect);
mutex_unlock(&sprdbat_data->lock);
}2.4 sprdbat_plug_works函数
在usb插入的回调函数sprdbat_usb_plug_event中会使用，在probe如果初始状态也是会使用:
static void sprdbat_plug_works(struct work_struct *work)
{
if (usb_charger_get_state(sprdbat_data->usb_charger)
== USB_CHARGER_PRESENT)
plugin_callback();
else
plugout_callback();
}
static int plugin_callback(void)
{
SPRDBAT_DEBUG("charger plug in interrupt happenn");
mutex_lock(&sprdbat_data->lock);
sprdbat_data->sprdbat_vbat_ovp_cnt = 0;
//排除异常情况
if (sprdbat_data->bat_info.module_state
!= POWER_SUPPLY_STATUS_DISCHARGING) {
mutex_unlock(&sprdbat_data->lock);
return 0;
}
sprdbat_data->bat_info.adp_type = sprdchg_charger_is_adapter();
if ((sprdbat_data->bat_info.adp_type == SDP_TYPE) ||
(sprdbat_data->bat_info.adp_type == CDP_TYPE)) {
sprdbat_data->bat_info.usb_online = 1;
power_supply_changed(sprdbat_data->usb);
} else {
sprdbat_data->bat_info.ac_online = 1;
power_supply_changed(sprdbat_data->ac);
}
sprdbat_data->bat_info.chgr_temp
= sprdbat_get_avg_chgr_temp(NORMAL_TEMP, true);
//充电器插入
sprdbat_change_module_state(SPRDBAT_ADP_PLUGIN_E);
sprdbat_adp_plug_nodify(1);
//快充检测
sprdbat_fchg_detect();
sprdbat_charge_prepare();
//开始充电，回调内部充电里面的函数
sprdbat_data->start_charge();
if (sprdchg_timer_op->timer_enable) {
u32 polling_time = sprdbat_data->pdata->chg_polling_time;
if (sprdbat_data->pdata->only_vol_mode)
sprdchg_timer_op->timer_enable(polling_time, ONE_TIME);
else
sprdchg_timer_op->timer_enable(polling_time,
PERIOD_TIME);
}
mutex_unlock(&sprdbat_data->lock);
SPRDBAT_DEBUG("plugin_callback:adp_type:%dn",
sprdbat_data->bat_info.adp_type);
SPRDBAT_DEBUG("plugin_callback: end...n");
return 0;
}
static int plugout_callback(void)
{
uint32_t adp_type = sprdbat_data->bat_info.adp_type;
SPRDBAT_DEBUG("charger plug out interrupt happenn");
mutex_lock(&sprdbat_data->lock);
if (sprdbat_data->bat_info.module_state
== POWER_SUPPLY_STATUS_DISCHARGING) {
mutex_unlock(&sprdbat_data->lock);
return 0;
}
disable_irq_nosync(sprdbat_data->irq_vchg_ovi);
if (sprdchg_timer_op->timer_disable)
sprdchg_timer_op->timer_disable();
sprdbat_change_module_state(SPRDBAT_ADP_PLUGOUT_E);
sprdbat_data->stop_charge();
if ((sprd_fchg_op != NULL) && sprd_fchg_op->fchg_deinit)
sprd_fchg_op->fchg_deinit();
sprdbat_adp_plug_nodify(0);
sprdbat_data->bat_info.module_state = POWER_SUPPLY_STATUS_DISCHARGING;
sprdbat_data->bat_info.adp_type = SDP_TYPE;
sprdbat_data->bat_info.ac_online = 0;
sprdbat_data->bat_info.usb_online = 0;
sprdbat_data->fchg_det = 0;
mutex_unlock(&sprdbat_data->lock);
if (sprd_ext_ic_op->set_input_cur_limit) {
unsigned int limit = sprdbat_data->pdata->adp_sdp_cur_limit;
sprd_ext_ic_op->set_input_cur_limit(limit);
sprdbat_data->bat_info.input_cur_limit = limit;
}
if ((adp_type == SDP_TYPE) || (adp_type == CDP_TYPE))
power_supply_changed(sprdbat_data->usb);
else
power_supply_changed(sprdbat_data->ac);
return 0;
}2.5 sprdbat_charge_works函数
这个函数会在sprdbat_change_module_state中使用，还有sprdbat_timer_handler函数中使用定时器中断；
static void sprdbat_charge_works(struct work_struct *work)
{
SPRDBAT_DEBUG("sprdbat_charge_works----------startn");
mutex_lock(&sprdbat_data->lock);
//只有电压模式暂时不考虑
if (!sprdbat_data->pdata->only_vol_mode) {
sprdbat_data->bat_info.vbat_vol = sprdbat_read_vbat_vol();
sprdbat_data->bat_info.vbat_ocv = sprdfgu_read_vbat_ocv();
}
//读取电流
sprdbat_data->bat_info.bat_current = sprdfgu_read_batcurrent();
//假设外部充电IC存在，则喂狗
if (sprd_ext_ic_op->timer_callback_ext)
sprd_ext_ic_op->timer_callback_ext();
//没有充电则是返回
if (sprdbat_data->bat_info.module_state ==
POWER_SUPPLY_STATUS_DISCHARGING) {
SPRDBAT_DEBUG("not charing returnn");
mutex_unlock(&sprdbat_data->lock);
return;
}
if (sprdbat_data->pdata->only_vol_mode &&
!sprdchg_timer_op->timer_enable) {
mutex_unlock(&sprdbat_data->lock);
return;
}
//只有电压模式暂时不考虑
if (sprdbat_data->pdata->only_vol_mode) {
unsigned int poll_time_fast =
sprdbat_data->pdata->chg_polling_time_fast;
unsigned int poll_time =
sprdbat_data->pdata->chg_polling_time;
if (sprdbat_data->bat_info.chg_stop_flags ==
SPRDBAT_CHG_END_NONE_BIT) {
if (sprdbat_data->bat_info.chging_on) {
sprd_ext_ic_op->charge_stop_ext
(SPRDBAT_CHG_END_NONE_BIT);
sprdbat_data->bat_info.chging_on = 0;
sprdchg_timer_op->timer_disable();
sprdchg_timer_op->timer_enable(poll_time_fast,
ONE_TIME);
mutex_unlock(&sprdbat_data->lock);
return;
}
sprdbat_data->bat_info.vbat_vol =
sprdbat_read_vbat_vol();
sprdbat_data->bat_info.vbat_ocv =
sprdfgu_read_vbat_ocv();
sprdbat_update_capacty();
sprdbat_data->bat_info.chging_on = 1;
sprd_ext_ic_op->charge_start_ext();
msleep(20);
sprdchg_timer_op->timer_disable();
sprdchg_timer_op->timer_enable(poll_time, ONE_TIME);
} else {
//读取vbat_vol
sprdbat_data->bat_info.vbat_vol =
sprdbat_read_vbat_vol();
//读取vbat开路电压
sprdbat_data->bat_info.vbat_ocv =
sprdfgu_read_vbat_ocv();
//更新电量
sprdbat_update_capacty();
sprdchg_timer_op->timer_disable();
sprdchg_timer_op->timer_enable(poll_time, ONE_TIME);
}
}
if (sprdbat_data->bat_info.chg_stop_flags & SPRDBAT_CHG_END_FULL_BIT)
//充满标志位，如果判断开路电压降低到rechg-vol
sprdbat_chg_rechg_monitor();
sprdbat_chg_status_monitor();
sprdbat_chg_timeout_monitor();
sprdbat_chg_ovp_monitor();
sprdbat_temp_monitor();
sprdbat_chgr_temp_monitor();
sprdbat_fault_monitor();
mutex_unlock(&sprdbat_data->lock);
sprdbat_chg_print_log();
SPRDBAT_DEBUG("sprdbat_charge_works----------endn");
}2.5.1 充满电监控函数sprdbat_chg_status_monitor
代码语言：javascript复制static void sprdbat_chg_status_monitor(void)
{
int chg_status = POWER_SUPPLY_STATUS_CHARGING;
SPRDBAT_DEBUG
(" %s,ocv=%d, cur=%d,chg_end_vol_l=%d,chg_end_cur=%dn",
__func__, sprdbat_data->bat_info.vbat_ocv,
sprdbat_data->bat_info.bat_current,
sprdbat_data->pdata->chg_end_vol_l,
sprdbat_data->pdata->chg_end_cur);
//这个暂且不理
if (sprdbat_data->pdata->only_vol_mode) {
if (sprdbat_data->bat_info.vbat_vol >
sprdbat_data->pdata->chg_end_vol_l) {
sprdbat_data->chg_full_trigger_cnt ;
if (sprdbat_data->chg_full_trigger_cnt >= 2) {
sprdbat_data->chg_full_trigger_cnt = 0;
if (sprdbat_data->bat_info.capacity >= 99 &&
trickle_time >=
sprdbat_data->pdata->cap_one_per_time) {
sprdbat_change_module_state
(SPRDBAT_CHG_FULL_E);
sprdbat_data->stop_charge();
} else {
sprdfgu_force_set_soc(1000);
}
}
} else {
sprdbat_data->chg_full_trigger_cnt = 0;
}
return;
}
//chg_full_condition 的设备树由chg-full-condition决定，并且是0，决定充电结束条件
if (sprdbat_data->pdata->chg_full_condition == FROM_EXT_IC) {
chg_status = sprd_ext_ic_op->get_charging_status();
if (chg_status == POWER_SUPPLY_STATUS_FULL) {
SPRDBAT_DEBUG("chg fulln");
/* capacity is high enough, set the status to full */
if (sprdbat_data->bat_info.capacity >= 99 &&
trickle_time >=
sprdbat_data->pdata->cap_one_per_time)
sprdbat_change_module_state(SPRDBAT_CHG_FULL_E);
else
sprdfgu_force_set_soc(1000);
} else {
SPRDBAT_DEBUG("chging or faultn");
}
} else if (sprdbat_data->pdata->chg_full_condition == VOL_AND_CUR) {
//两个条件同时成立两次，一是vbat的电压大于截止充电电压条件，二是vbat的充电电流小于充电电流
if ((sprdbat_data->bat_info.vbat_vol >
sprdbat_data->pdata->chg_end_vol_l)
&& (sprdbat_data->bat_info.bat_current <
sprdbat_data->pdata->chg_end_cur)) {
sprdbat_data->chg_full_trigger_cnt ;
if (sprdbat_data->chg_full_trigger_cnt >= 2) {
SPRDBAT_DEBUG("charge full stop chargen");
sprdbat_data->chg_full_trigger_cnt = 0;
/* cap is high enough, set the status to full */
if (sprdbat_data->bat_info.capacity >= 99 &&
trickle_time >=
sprdbat_data->pdata->cap_one_per_time) {
sprdbat_change_module_state
(SPRDBAT_CHG_FULL_E);
sprdbat_data->stop_charge();
} else {
sprdfgu_force_set_soc(1000);
}
}
} else {
sprdbat_data->chg_full_trigger_cnt = 0;
}
} else if (sprdbat_data->pdata->chg_full_condition == VOL_AND_STATUS) {
if ((sprdbat_data->bat_info.vbat_vol >
sprdbat_data->pdata->chg_end_vol_l
|| sprd_ext_ic_op->get_charging_status())
&& (sprdbat_data->bat_info.bat_current <
sprdbat_data->pdata->chg_end_cur)) {
sprdbat_data->chg_full_trigger_cnt ;
if (sprdbat_data->chg_full_trigger_cnt >= 2) {
SPRDBAT_DEBUG("charge full stop chargen");
sprdbat_data->chg_full_trigger_cnt = 0;
/* cap is high enough, set the status to full */
if (sprdbat_data->bat_info.capacity >= 99 &&
trickle_time >=
sprdbat_data->pdata->cap_one_per_time) {
sprdbat_change_module_state
(SPRDBAT_CHG_FULL_E);
sprdbat_data->stop_charge();
} else {
sprdfgu_force_set_soc(1000);
}
}
} else {
sprdbat_data->chg_full_trigger_cnt = 0;
}
} else {
SPRDBAT_DEBUG("bad chg_full_conditionn");
}
}2.5.2 充电超时监控函数sprdbat_chg_timeout_monitor
充电超时后如果满足电量充足则状态设置为满电状态，如果电池电压过低则需要重新启动充电
代码语言：javascript复制static void sprdbat_chg_timeout_monitor(void)
{
SPRDBAT_DEBUG("sprdbat_chg_timeout_monitor entern");
if (sprdbat_data->bat_info.chg_stop_flags &
SPRDBAT_CHG_END_TIMEOUT_BIT) {
SPRDBAT_DEBUG("sprdbat_chg_timeout_monitor rechargen");
sprdbat_change_module_state(SPRDBAT_CHG_TIMEOUT_RESTART_E);
sprdbat_data->start_charge();
}
if (sprdbat_data->bat_info.chg_stop_flags == SPRDBAT_CHG_END_NONE_BIT) {
if (sprdbat_is_chg_timeout()) {
SPRDBAT_DEBUG
("sprdbat_chg_timeout_monitor chg timeoutn");
if (sprdbat_data->bat_info.vbat_ocv >
sprdbat_data->pdata->rechg_vol) {
sprdbat_change_module_state(SPRDBAT_CHG_FULL_E);
sprdbat_data->stop_charge();
} else {
sprdbat_data->bat_info.chg_this_timeout =
sprdbat_data->pdata->chg_rechg_timeout;
sprdbat_change_module_state
(SPRDBAT_CHG_TIMEOUT_E);
sprdbat_data->stop_charge();
}
}
}
}2.5.3 充电器过压保护监控函数
充电器过压采用轮询方式轮询用户配置电压参数修改充电状态，快充电压如果下降2000mv 则退出快充，重新设定充电电流。
代码语言：javascript复制ovp-stop = <6500>; //充电过压保护
ovp-restart = <5800>; //过压恢复电压
fchg-ovp-stop = <11000>; //快充过压电压
fchg-ovp-restart = <10000>; //快充过压恢复电压static void sprdbat_chg_ovp_monitor(void)
{
int ovp_restart, ovp_stop;
if (sprdbat_data->fchg_det) {
ovp_restart = sprdbat_data->pdata->fchg_ovp_restart;
ovp_stop = sprdbat_data->pdata->fchg_ovp_stop;
} else {
ovp_restart = sprdbat_data->pdata->ovp_restart;
ovp_stop = sprdbat_data->pdata->ovp_stop;
}
SPRDBAT_DEBUG("%s chg_vol = %d,ovp_stop =%d,ovp_restart=%dn",
__func__, sprdbat_data->bat_info.avg_chg_vol,
ovp_stop, ovp_restart);
if (sprdbat_data->bat_info.chg_stop_flags & SPRDBAT_CHG_END_OVP_BIT) {
if (sprdbat_data->bat_info.avg_chg_vol <= ovp_restart) {
SPRDBAT_DEBUG("charge vol low restart chgn");
sprdbat_change_module_state(SPRDBAT_OVI_RESTART_E);
sprdbat_data->start_charge();
} else {
SPRDBAT_DEBUG("sprdbat_chg_ovp_monitor ovp return ");
}
} else if (sprdbat_data->bat_info.avg_chg_vol >= ovp_stop) {
SPRDBAT_DEBUG("charge vol is too highn");
sprdbat_change_module_state(SPRDBAT_OVI_STOP_E);
sprdbat_data->stop_charge();
}
if (sprdbat_data->fchg_det) {
/*if vbus vol <(vbus - 2000mv),exit*/
uint32_t fchg_l = sprdbat_data->pdata->fchg_vol - 2000;
if (sprdbat_data->bat_info.avg_chg_vol <= fchg_l) {
SPRDBAT_DEBUG("fchg_l_low:%dn", fchg_l);
sprdbat_data->fchg_det = 0;
if ((sprd_fchg_op != NULL)
&& (sprd_fchg_op->fchg_deinit))
sprd_fchg_op->fchg_deinit();
sprdbat_charge_prepare();
sprdbat_data->start_charge();
power_supply_changed(sprdbat_data->battery);
}
}
}2.5.4 充电器温度监控函数
具体参考《SL8541E充电介绍.pdf》
2.5.5 sprdbat_chgr_temp_monitor函数
暂且不知道作用
2.5.6 sprdbat_fault_monitor监控错误函数
代码语言：javascript复制static void sprdbat_fault_monitor(void)
{
int chg_fault, status, vbat_ovp, terminal_voltage;
SPRDBAT_DEBUG("sprdbat_fault_monitor entern");
status = sprdbat_data->cur_temp_status;
terminal_voltage = sprdbat_data->pdata->jeita_tab[status].z;
vbat_ovp = terminal_voltage VBAT_OVP_THRESHOLD;
chg_fault = sprd_ext_ic_op->get_charging_fault();
if (chg_fault == SPRDBAT_CHG_END_NONE_BIT)
sprdbat_fault_recovery_monitor();
if (chg_fault & SPRDBAT_CHG_END_OTP_COLD_BIT)
SPRDBAT_DEBUG(" power coldn");
if (chg_fault & SPRDBAT_CHG_END_OTP_OVERHEAT_BIT)
SPRDBAT_DEBUG("power hotn");
if (chg_fault & SPRDBAT_CHG_END_TIMEOUT_BIT) {
SPRDBAT_DEBUG(" safe time expiren");
sprdbat_change_module_state(SPRDBAT_CHG_TIMEOUT_E);
}
if (chg_fault & SPRDBAT_CHG_END_BAT_OVP_BIT) {
if (sprdbat_data->sprdbat_vbat_ovp_cnt > VBAT_OVP_CNT_THRESHOLD &&
sprdbat_data->bat_info.vbat_vol > vbat_ovp) {
SPRDBAT_DEBUG("fault: vbat ovpn");
sprdbat_change_module_state(SPRDBAT_VBAT_OVP_E);
} else {
SPRDBAT_DEBUG("warning: vbat ovpn");
sprdbat_fchg_detect();
sprdbat_charge_prepare();
sprdbat_data->start_charge();
sprdbat_data->sprdbat_vbat_ovp_cnt ;
}
} else {
sprdbat_data->sprdbat_vbat_ovp_cnt = 0;
}
if (chg_fault == SPRDBAT_CHG_END_UNSPEC)
SPRDBAT_DEBUG(" unspec faultn");
}3. 其他状态位
3.1 充电状态：
代码语言：javascript复制enum sprdbat_event {
SPRDBAT_ADP_PLUGIN_E, //充电器插入
SPRDBAT_ADP_PLUGOUT_E, //充电器拔出
SPRDBAT_OVI_STOP_E, //充电器电压过高
SPRDBAT_OVI_RESTART_E, //充电器过压后恢复
SPRDBAT_OTP_COLD_STOP_E, //电池温度过低
SPRDBAT_OTP_OVERHEAT_STOP_E, //电池温度过高
SPRDBAT_OTP_COLD_RESTART_E, //电池温度从低温恢复
SPRDBAT_OTP_OVERHEAT_RESTART_E, //电池温度从高温恢复
SPRDBAT_CHG_FULL_E, //充满电
SPRDBAT_RECHARGE_E, //满电后复充
SPRDBAT_CHG_TIMEOUT_E, //充电超时
SPRDBAT_CHG_TIMEOUT_RESTART_E, //超时后重新启动充电
SPRDBAT_VBAT_OVP_E, //电池过压
SPRDBAT_VBAT_OVP_RESTART_E, //电池过压恢复
SPRDBAT_CHG_UNSPEC_E, //电池拔出
SPRDBAT_CHG_UNSPEC_RESTART_E, //电池拔出后重新插入
SPRDBAT_FULL_TO_CHARGING_E, //满电强制启动充电
SPRDBAT_CHARGING_TO_FULL_E, //充电强制显示 100
SPRDBAT_CHG_FORCE_STOP_E, //强制启动充电
SPRDBAT_CHG_FORCE_START_E, //强制关闭充电
};
