Connect USB peripherals to your Nexus One (aka. N1)

• Required hardware
  • Rooted Nexus One with QSD8250 SoC (my ZTE Blade and Huawei Ideos U8150 ports and kernel & modules for the Galaxy Nexus i9250; threads from others @ xda-developers for the G1/Desire/Incredible)
  • USB OTG cable with Micro B plug (e.g., advantage: ID pin connected to ground for future auto detection) or Micro USB cable and adapter
  • Powered USB 2.0 hub that provides its power to the upstream port (e.g.; detectable by the Nexus One being charged)
  • If it doesn't: USB Dual Power Cable (e.g.), since the Nexus One doesn't provide bus power to the hub chip. Also see here.
  • For mobile use: battery (e.g.) (measurements)
• Software
  • Android version: 2.2.2; Kernel version: 2.6.32.9-27242-g4c0d547-dirty based on 27240-gbca5320; Build number: FRG83G
    • Build from source
      • git clone http://github.com/sonic74/kernel_msm.git
        cd kernel_msm
        make -j2 ARCH=arm CROSS_COMPILE=/android-ndk-r5c/toolchains/arm-eabi-4.4.0/prebuilt/linux-x86/bin/arm-eabi-
  • Android version: 2.3.4; Kernel version: 2.6.35.7 based on g52630a3; Build number: GRJ22
    • Download binaries…
      • boot.img (usbcore, ehci-hcd included in kernel)
      • Kernel modules (Replace /system/lib/modules/bcm4329.ko !)
    • …or build from source (for QSD8250 SoC)
      
      • # Don't let the archive name confuse you
        tar xfz android-kernel_msm-v2.6.30-rc2-59463-g52630a3.tar.gz
        cd android-kernel_msm-52630a3
        tar xfj ehci-msm7201_N1-2_3_4.tbz
        make -j2 ARCH=arm CROSS_COMPILE=/android-ndk-r5c/toolchains/arm-eabi-4.4.0/prebuilt/linux-x86/bin/arm-eabi-
  • Install kernel
    • Boot from RAM (till next reset; only possible when using modules)…
      • /android-sdk/platform-tools/fastboot boot arch/arm/boot/zImage
        
    • …or write to flash
      • extract ramdisk.img from your RA-passion nandroid backup …
        • /getramdisk.py /boot.img
          
        • /android-sdk/platform-tools/fastboot -b 0x20000000 flash:raw boot arch/arm/boot/zImage /ramdisk.img
          
      • …or boot.img
        • /android-sdk/platform-tools/fastboot flash boot /boot.img
          
• Connect the USB cable now (else no devices are detected later), start ConnectBot, enable full screen for fb access and connect to Local
  • insmod drivers/usb/core/usbcore.ko
    # Ignore the Unbalanced enabled for IRQ 58 stack trace for now
    insmod drivers/usb/host/ehci-hcd.ko
• To substitute USB device mode functions with TCP/IP (or finish Andrew de Quincey's work or adapt USB Mode)
  • adb
    • setprop service.adb.tcp.port 5555
      stop adbd
      start adbd
      
    • adb connect IP_address
  • Filesystem access
    • Nexus One's
      • On Air (Vista/7 WebDAV registry patch, ro)
      • /android-sdk/tools/ddms
      • RA-passion recovery
    • PC's
      • insmod fs/cifs/cifs.ko
        mount -t cifs -o username=username //IP_address/share /mnt/sdcard/cifs

HID input devices

• Script to load modules
• Gamepad IME
• X11
  • /etc/X11/xorg.conf
  • apt-get install lxde
    startx
    

USB storage

• insmod drivers/usb/storage/usb-storage.ko
  # Wait for device enumeration
  mount -t vfat /dev/block/sda1 /mnt/sdcard/usb-storage

Ethernet

• Turn on airplane mode and reboot
• Script to load modules, DHCP and DNS
• Google Play downloads don't work

External displays

• Hardware
  • DisplayLink device
• Software
  • SlugTerm DL
    • mount -t usbfs none /proc/bus/usb
      /data/local/bin/slugterm_dl-armel -k /dev/input/event8 -p 0377 -i 00cfa43c4e5573712b7152ffffeeca0640e257fffffff904b00402907e -f /mnt/sdcard/usr/local/share/fonts/FON2FNT/dosapp_18.FNT -c /system/bin/sh
  • Framebuffer
    • Script to load modules
    • Source; delete select FB_DEFERRED_IO in Kconfig
    • Send to Framebuffer Framebuffer.apk
      • /system/build.prop:
        dalvik.vm.heapsize=42m
      • Framebuffer fb=new Framebuffer();
        Bitmap bm=fb.createBitmap();
        fb.tranfer(bm, true);
        
      • Also included: Display images on a DisplayLink device from all Android apps through SEND Intent:

        

    • Console (Warning: once it scrolled, Nexus One won't shutdown completely)
      • insmod drivers/video/console/font.ko
        insmod drivers/video/console/softcursor.ko
        insmod drivers/video/console/bitblit.ko
        insmod drivers/video/console/fbcon.ko
      • Android framework
        • chmod 666 /dev/console
        • PrintWriter pw=new PrintWriter("/dev/console");
          pw.println("Hello Android!");
    • X11
      • Lenny
        • /etc/X11/xorg.conf
        • /usr/local/lib/xorg/modules/drivers/displaylink_drv.so (Source)
      • Squeeze
        • /etc/X11/xorg.conf
        • /usr/local/lib/xorg/modules/drivers/fbdev_drv.so (Source)
    • As primary display (BeagleBoard)

Audio/MIDI devices

• Script to load modules
• FileInput/OutputStream("/dev/snd/dsp")

DVB/ATSC digital TV receivers

• Script to load modules and firmware
• Patch for LiveTV to scan and tune channels
• VPlayer (started by LiveTV)

Serial

• Script to load modules
• APIs
• Problem on N1: After closing and reopening /dev/ttyUSB0, no more data is received

V4L

• insmod drivers/media/video/gspca/gspca_main.ko
  insmod drivers/media/video/gspca/gspca_sonixj.ko
• motion

Thread @ xda-developers