kernel-4.4\drivers\power\power_supply_core.c
当电量信息需要更新的时候,kernel会调用power_supply_changed_work这个工作队列,使用kobject_uevent函数往上发送uevent事件,action是KOBJ_CHANGE;
static void power_supply_changed_work(struct work_struct *work)
{
unsigned long flags;
struct power_supply *psy = container_of(work, struct power_supply,
changed_work);
dev_dbg(&psy->dev, "%s\n", __func__);
spin_lock_irqsave(&psy->changed_lock, flags);
/*
* Check 'changed' here to avoid issues due to race between
* power_supply_changed() and this routine. In worst case
* power_supply_changed() can be called again just before we take above
* lock. During the first call of this routine we will mark 'changed' as
* false and it will stay false for the next call as well.
*/
if (likely(psy->changed)) {
printk("power_supply_changed_work 1111 \n" );