[marcus]

Вот пример структуры
sys/bus/usb/devices

usb1
Freescale On-Chip EHCI Host Controller
1-0:1.0 bcdDevice bDeviceSubClass bNumConfigurations descriptors ep_00 maxchild serial urbnum
1-1 bConfigurationValue bmAttributes bNumInterfaces dev idProduct power speed usb_endpoint
authorized bDeviceClass bMaxPacketSize0 busnum devnum idVendor product subsystem version
authorized_default bDeviceProtocol bMaxPower configuration driver manufacturer quirks uevent

1-1
USB Hub 2.0
1-1.1 authorized bDeviceProtocol bMaxPower configuration driver manufacturer quirks urbnum
1-1:1.0 bcdDevice bDeviceSubClass bNumConfigurations descriptors ep_00 maxchild speed usb_endpoint
1-1.2 bConfigurationValue bmAttributes bNumInterfaces dev idProduct power subsystem version
1-1.3 bDeviceClass bMaxPacketSize0 busnum devnum idVendor product uevent

как видно три устройства подключены 1-1.1 - DISK1 , 1-1.2 ZTE WCDMA Technologies MSM
и 1-1.3 - DISK1, на деле это флешкарта по проверке bMaxPower 1 и 3 выдает по 100мА
2 устройство 500 мА

1-1.1:1.0 bDeviceClass bMaxPacketSize0 busnum devnum idVendor product subsystem version
authorized bDeviceProtocol bMaxPower configuration driver manufacturer quirks uevent
bcdDevice bDeviceSubClass bNumConfigurations descriptors ep_00 maxchild serial urbnum
bConfigurationValue bmAttributes bNumInterfaces dev idProduct power speed usb_endpoint

1-1.2:1.0 bcdDevice bDeviceSubClass bNumConfigurations descriptors ep_00 maxchild speed usb_endpoint
1-1.2:1.1 bConfigurationValue bmAttributes bNumInterfaces dev idProduct power subsystem version
1-1.2:1.2 bDeviceClass bMaxPacketSize0 busnum devnum idVendor product uevent
authorized bDeviceProtocol bMaxPower configuration driver manufacturer quirks urbnum

1-1.3:1.0 bDeviceClass bMaxPacketSize0 busnum devnum idVendor product subsystem version
authorized bDeviceProtocol bMaxPower configuration driver manufacturer quirks uevent
bcdDevice bDeviceSubClass bNumConfigurations descriptors ep_00 maxchild serial urbnum
bConfigurationValue bmAttributes bNumInterfaces dev idProduct power speed usb_endpoint

во второй папке почему то три описаний интерфейсa