/** * device_pm_add - Add a device to the PM core's list of active devices. * @dev: Device to add to the list. */ void device_pm_add(struct device *dev) { pr_debug("PM: Adding info for %s:%s\n", dev->bus ? dev->bus->name : "No Bus", kobject_name(&dev->kobj)); mutex_lock(&dpm_list_mtx); if (dev->parent) { if (dev->parent->power.status >= DPM_SUSPENDING) dev_warn(dev, "parent %s should not be sleeping\n", dev_name(dev->parent)); } else if (transition_started) { /* * We refuse to register parentless devices while a PM * transition is in progress in order to avoid leaving them * unhandled down the road */ dev_WARN(dev, "Parentless device registered during a PM transaction\n"); } list_add_tail(&dev->power.entry, &dpm_list); mutex_unlock(&dpm_list_mtx); }
综上，设备挂到电源管理的函数调用关系是（依次往下调用）
audio_card_init （函数类型包含__init 初始化调用）
platform_device_add
device_add
device_pm_add