86 lines
3.4 KiB
Bash
86 lines
3.4 KiB
Bash
#!/usr/bin/env bash
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# lesavka-core.sh - background stealth daemon to present gadget as usb hub of genuine devices
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# Proven Pi-5 configfs gadget: HID keyboard+mouse
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# Still need Web Cam Support + stereo UAC2
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# lesavka-core – one-shot gadget bring-up for Pi-5 / Arch-ARM
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set -euo pipefail
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# 1) Ensure the dwc2 peripheral overlay is active exactly once
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CFG=/boot/config.txt
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grep -q 'dtoverlay=dwc2,dr_mode=peripheral' "$CFG" || echo 'dtoverlay=dwc2,dr_mode=peripheral' >> "$CFG"
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# 2) Load kernel modules (idempotent)
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modprobe dwc2 || { echo "dwc2 not in kernel; abort" >&2; exit 1; }
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modprobe libcomposite || { echo "libcomposite not in kernel; abort" >&2; exit 1; }
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modprobe -r uvcvideo || true
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modprobe uvcvideo || { echo "uvcvideo not in kernel; abort" >&2; exit 1; }
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udevadm control --reload
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udevadm trigger --subsystem-match=video4linux
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udevadm settle
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# 3) Mount configfs once
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mountpoint -q /sys/kernel/config || mount -t configfs none /sys/kernel/config
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G=/sys/kernel/config/usb_gadget/lesavka
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# 4) Tear down any previous half-built gadget
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if [[ -d $G ]]; then
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echo '' >"$G/UDC" 2>/dev/null || true
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sleep 0.2
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find "$G/configs" -type l -delete 2>/dev/null || true
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rm -rf "$G" 2>/dev/null || true
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fi
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# 5) Create gadget (boot-keyboard + UAC2 mic/spkr, 500 mA max)
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mkdir -p "$G"
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echo 0x1d6b >"$G/idVendor" # Linux Foundation
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echo 0x0104 >"$G/idProduct" # Multifunction Composite Gadget
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echo 0x0200 >"$G/bcdUSB"
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mkdir -p "$G/strings/0x409"
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echo "$(cat /proc/sys/kernel/random/uuid)" >"$G/strings/0x409/serialnumber"
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echo "Lesavka" >"$G/strings/0x409/manufacturer"
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echo "Lesavka Composite" >"$G/strings/0x409/product"
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# ----------------------- HID keyboard (usb0) -----------------------
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mkdir -p "$G/functions/hid.usb0"
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echo 1 >"$G/functions/hid.usb0/protocol"
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echo 1 >"$G/functions/hid.usb0/subclass"
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echo 8 >"$G/functions/hid.usb0/report_length"
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printf '\x05\x01\x09\x06\xa1\x01\x05\x07\x19\xe0\x29\xe7\x15\x00\x25\x01'\
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'\x75\x01\x95\x08\x81\x02\x95\x01\x75\x08\x81\x01\x95\x05\x75\x01\x05'\
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'\x08\x19\x01\x29\x05\x91\x02\x95\x01\x75\x03\x91\x01\x95\x06\x75\x08'\
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'\x15\x00\x25\x65\x05\x07\x19\x00\x29\x65\x81\x00\xc0' \
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>"$G/functions/hid.usb0/report_desc"
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# ----------------------- HID mouse (usb1) --------------------------
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mkdir -p "$G/functions/hid.usb1"
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echo 2 > "$G/functions/hid.usb1/protocol" # Boot mouse
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echo 1 > "$G/functions/hid.usb1/subclass"
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echo 4 > "$G/functions/hid.usb1/report_length"
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printf '\x05\x01\x09\x02\xa1\x01\x09\x01\xa1\x00'\
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'\x05\x09\x19\x01\x29\x03\x15\x00\x25\x01\x95\x03\x75\x01\x81\x02'\
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'\x95\x01\x75\x05\x81\x03'\
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'\x05\x01\x09\x30\x09\x31\x09\x38\x15\x81\x25\x7f\x75\x08\x95\x03\x81\x06'\
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'\xc0\xc0' >"$G/functions/hid.usb1/report_desc"
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# # -- UAC2 Audio
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# mkdir -p $G/functions/uac2.usb0
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# echo 48000 > $G/functions/uac2.usb0/c_srate
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# echo 2 > $G/functions/uac2.usb0/c_ssize
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# echo 2 > $G/functions/uac2.usb0/p_chmask
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# ----------------------- configuration -----------------------------
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mkdir -p "$G/configs/c.1/strings/0x409"
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echo 500 > "$G/configs/c.1/MaxPower"
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echo "Config 1" > "$G/configs/c.1/strings/0x409/configuration"
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# 6) Finally bind to first available UDC
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ln -s $G/functions/hid.usb0 $G/configs/c.1/
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ln -s $G/functions/hid.usb1 $G/configs/c.1/
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# ln -s $G/functions/uac2.usb0 $G/configs/c.1/
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# 7) Finally bind to first available UDC
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echo $(ls /sys/class/udc | head -n1) > $G/UDC
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echo "[lesavka-core] gadget ready (keyboard on hidg0, mouse on hidg1)"
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