I used USB webcam(s) (Logicool QVX-13NS) with customized Galaxy Nexus (android 4.0.3). Only low-power webcams seem to work fine.
The launch of application fails unless the application is launched in an appropriate timing after the insertion of the USB cable.
I enabled the following kernel configuration,
CONFIG_VIDEO_DEV=y
CONFIG_VIDEO_V4L2_COMMON=y
CONFIG_VIDEO_MEDIA=y
CONFIG_USB_VIDEO_CLASS=y
CONFIG_V4L_USB_DRIVERS=y
CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV=y
in tuna_defconfig, and I commented out the following line in drivers/media/video/Kconfig.
# source "drivers/media/video/omapgfx/Kconfig"
Then I gave a permission 666 to /dev/video0,1 in ueventd.tuna.rc.
Finally, I wrote some applications that access /dev/video0,1 through JNI.


I used USB webcam(s) (Logicool Webcam C210) with Iconia Tab A500 (stock rom). I wrote some applications that access /dev/video0,1 through JNI.


USB to serial converter is used with stock android in USB host mode. REX-USB60MI (RATOC systems) and FTDriver (by ksksue) are used.


I used USB to serial converter with customized Galaxy Nexus (android 4.0.3). I tried communication with Windows, reading ultrasonic sensor, and controlling a robot.
I enabled the following kernel configuration,
CONFIG_USB_SERIAL_FTDI_SIO=y
CONFIG_USB_SERIAL_PL2303=y
in tuna_defconfig, and gave a permission 666 to /dev/ttyUSB0 in ueventd.tuna.rc.
And I wrote some applications that access /dev/ttyUSB0 through JNI.