84 lines
2.8 KiB
Bash
Executable File
84 lines
2.8 KiB
Bash
Executable File
#!/bin/bash
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# Adapted from
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# "Using OTG mode on Raspberry Pi SBCs"
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# https://pip-assets.raspberrypi.com/categories/685-app-notes-guides-whitepapers/documents/RP-009276-WP/Using-OTG-mode-on-Raspberry-Pi-SBCs
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# This script only works if you are running it as root
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if [ $(id -u) -ne 0 ]; then
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echo "Please run as root or use sudo"
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exit 1
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fi
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# Is the dwc2 overlay installed? Nothing will work if it isn't.
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if lsmod | grep -q "dwc2"; then
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echo "DWC2 module loaded, setting up OTG gadget serial and ethernet" | logger -t $0 -p info
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echo "DWC2 module loaded"
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else
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echo "DWC2 module missing. Aborting OTG setup." | logger -t $0 -p info
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echo "DWC2 module missing"
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systemctl disable serial-getty@ttyGS0.service
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exit 1
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fi
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modprobe libcomposite
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cd /sys/kernel/config/usb_gadget
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if [ -d "MyGadget" ]; then
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echo "MyGadget already exists. Aborting OTG setup." | logger -t $0 -p info
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exit 1
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fi
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# Create our new gadget
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mkdir MyGadget
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cd MyGadget
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# Add some boilerplate data that the gadget needs
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echo 0x1d6b > idVendor # Linux Foundation’s USB VID. Replace with your own VID if required
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echo 0x0104 > idProduct # Multifunction Composite Gadget
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echo 0x0100 > bcdDevice # v1.0.0
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echo 0x0200 > bcdUSB # USB2
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mkdir strings/0x409 # 0x409 = English
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# Insert your own manufacturer and gadget name here
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echo "RaspberryPi" > strings/0x409/manufacturer
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echo "MyPiGadget" > strings/0x409/product
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# Make the serial number the same as the Raspberry Pi serial number; you can use whatever is required here
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SERIAL=`cat /proc/cpuinfo | awk '/Serial/ {print $3}' `
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echo $SERIAL > strings/0x409/serialnumber
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# Create a configuration area and populate
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mkdir configs/c.1
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echo 120 > configs/c.1/MaxPower
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mkdir configs/c.1/strings/0x409
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echo "Config 1" > configs/c.1/strings/0x409/configuration
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# Create our specific gadget type
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## Mass storage device
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### Remember to create the storage block device first
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## cd /root
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### Example: Make a 256 MB file to act as "USB stick"
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## Only create it once or it will delete the previous content
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## sudo dd if=/dev/zero of=drive.bin bs=1M count=256
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### Create a VFAT file system on the backing store
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## sudo mkfs.vfat drive.bin
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##
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# mkdir functions/mass_storage.usb0
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## Set up our backing store
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# echo "/home/pi/drive.bin" > functions/mass_storage.usb0/lun.0/file
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## Link our function to our configuration
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#ln -s functions/mass_storage.0 configs/c.1/
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## Serial (CDC ACM)
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mkdir functions/acm.usb0
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ln -s functions/acm.usb0 configs/c.1/
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## Ethernet (RNDIS and ECM)
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## Of note, this may cause the IP to show up as 127.0.0.1
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## and wireless to suddenly fail to connect
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mkdir functions/ecm.usb0
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ln -s functions/ecm.usb0 configs/c.1/
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## USB Device Controller update
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UDC=`ls /sys/class/udc`
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echo $UDC > UDC
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# Enable the gettys
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systemctl enable serial-getty@ttyGS0.service
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