usb_port_device_type 309 drivers/usb/core/port.c struct device_type usb_port_device_type = { usb_port_device_type 557 drivers/usb/core/port.c port_dev->dev.type = &usb_port_device_type; usb_port_device_type 139 drivers/usb/core/usb.h extern struct device_type usb_port_device_type; usb_port_device_type 159 drivers/usb/core/usb.h return dev->type == &usb_port_device_type;