msm8996:/ # ls /sys/bus/usb/devices/usb1/speed
/sys/bus/usb/devices/usb1/speed
msm8996:/ # cat /sys/bus/usb/devices/usb1/speed
480
msm8996:/ # cat /sys/bus/usb/devices/usb1/version
2.00
msm8996:/ # cat /sys/bus/usb/devices/usb1/idVendor
1d6b
msm8996:/ # cat /sys/bus/usb/devices/usb1/power/
cat: /sys/bus/usb/devices/usb1/power/: Is a directory
1|msm8996:/ # cat /sys/bus/usb/devices/usb1/power/
active_duration wakeup_abort_count
autosuspend wakeup_active
autosuspend_delay_ms wakeup_active_count
connected_duration wakeup_count
control wakeup_expire_count
level wakeup_last_time_ms
runtime_active_time wakeup_max_time_ms
runtime_status wakeup_prevent_sleep_time_ms
runtime_suspended_time wakeup_total_time_ms
wakeup
1|msm8996:/ # cat /sys/bus/usb/devices/usb1/
1-0:1.0/ driver/
authorized ep_00/
authorized_default idProduct
avoid_reset_quirk idVendor
bConfigurationValue interface_authorized_default
bDeviceClass ltm_capable
bDeviceProtocol manufacturer
bDeviceSubClass maxchild
bMaxPacketSize0 power/
bMaxPower product
bNumConfigurations quirks
bNumInterfaces removable
bcdDevice remove
bmAttributes serial
busnum speed
configuration subsystem/
descriptors uevent
dev urbnum
devnum version
devpath
1|msm8996:/ # cat /sys/bus/usb/devices/usb1/
1-0:1.0/ // USB设备名：USB配置 . 该接口编号。
物理USB设备和接口都表示单独设备。每个设备都以root-hub 作为第一个编号。后跟 - 该插入的端口号。