158 lines
6.7 KiB
Bash
158 lines
6.7 KiB
Bash
#!/usr/bin/env bash
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# lesavka‑core.sh - one‑shot USB‑gadget bring‑up (Pi‑5 / Arch‑ARM)
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# Presents: • Boot‑protocol keyboard (hidg0)
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# • Boot‑protocol mouse (hidg1)
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# • Stereo UAC2 speaker + microphone
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set -euo pipefail
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log() { printf '[lesavka-core] %s\n' "$*"; }
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#──────────────────────────────────────────────────
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# 1. Ensure overlay + kernel modules
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#──────────────────────────────────────────────────
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CFG=/boot/config.txt
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grep -q 'dtoverlay=dwc2,dr_mode=peripheral' "$CFG" || echo 'dtoverlay=dwc2,dr_mode=peripheral' >> "$CFG"
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modprobe dwc2 || { echo "dwc2 not in kernel; abort" >&2; exit 1; }
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modprobe libcomposite || { echo "libcomposite not in kernel; abort" >&2; exit 1; }
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modprobe -r uvcvideo 2>/dev/null || true
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modprobe uvcvideo || { echo "uvcvideo not in kernel; abort" >&2; exit 1; }
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udevadm control --reload
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udevadm trigger --subsystem-match=video4linux
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udevadm settle
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#──────────────────────────────────────────────────
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# 2. Wait for UDC device to appear (max 10 s)
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#──────────────────────────────────────────────────
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log "⏳ waiting for UDC to register ..."
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UDC=""
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for _ in {1..100}; do # 100 × 100ms = 10s
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UDC=$(ls /sys/class/udc 2>/dev/null | head -n1) && [[ -n $UDC ]] && break
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sleep 0.1
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done
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if [[ -z $UDC ]]; then
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log "⚠️ UDC still absent - trying manual bind"
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for drv in dwc2 dwc3; do
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drv_root="/sys/bus/platform/drivers/$drv"
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[[ -d $drv_root ]] || continue
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for node in /sys/bus/platform/devices/*usb*; do
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node=${node##*/} # strip path
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echo "$node" >"$drv_root/bind" 2>/dev/null || continue
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done
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done
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# re-check for another 5 s
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for i in {1..50}; do
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UDC=$(ls /sys/class/udc 2>/dev/null | head -n1) && [[ -n $UDC ]] && break
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sleep 0.1
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done
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fi
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[[ -n $UDC ]] || { log "❌ UDC not present after manual bind"; exit 1; }
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log "✅ UDC detected: $UDC"
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#──────────────────────────────────────────────────
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# 3. (Re‑)create gadget
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#──────────────────────────────────────────────────
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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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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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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' >"$G/functions/hid.usb1/report_desc"
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# ---------- UAC2 function - speaker + mic, 2×48 kHz stereo ---------
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mkdir -p "$G/functions/uac2.usb0"
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U="$G/functions/uac2.usb0"
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# Playback (speaker)
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echo 0x3 >"$U/p_chmask" # L+R
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echo 48000 >"$U/p_srate"
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echo 2 >"$U/p_ssize" # 16 bit
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# Capture (microphone)
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echo 0x3 >"$U/c_chmask"
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echo 48000 >"$U/c_srate"
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echo 2 >"$U/c_ssize"
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# Optional: allocate a few extra request buffers
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echo 32 >"$U/req_number" 2>/dev/null || true
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# ----------------------- UVC function (usb‑video) ------------------
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mkdir -p "$G/functions/uvc.usb0"
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# Mandatory control interface strings
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mkdir -p "$G/functions/uvc.usb0/control/strings/0x409"
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echo "Lesavka UVC" >"$G/functions/uvc.usb0/control/strings/0x409/label"
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# Simple 720p MJPEG + 720p H.264 alt‑setting
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printf '\x50\x00\x00\x00' >"$G/functions/uvc.usb0/control/header/h_video"
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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" > "$G/configs/c.1/strings/0x409/configuration"
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echo "Config 1: HID + UAC2" >"$G/configs/c.1/strings/0x409/configuration"
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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 $U $G/configs/c.1/
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ln -s $G/functions/uvc.usb0 $G/configs/c.1/
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# mkdir -p $G/functions/hid.usb0/os_desc
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# mkdir -p $G/functions/hid.usb1/os_desc
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# mkdir -p $U/os_desc
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# ---------- optional Microsoft OS descriptors ----------------------
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# if [ -e "$G/os_desc/use" ]; then
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# echo 1 >"$G/os_desc/use"
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# echo 0xcd >"$G/os_desc/b_vendor_code"
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# echo "MSFT100" >"$G/os_desc/qw_sign"
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# ln -s "$G/configs/c.1" "$G/os_desc" # creates $G/os_desc/conf
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# echo "Lesavka Keyboard" >"$G/functions/hid.usb0/os_desc/interface"
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# echo "Lesavka Mouse" >"$G/functions/hid.usb1/os_desc/interface"
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# echo "Lesavka Mic+Spkr" >"$U/os_desc/interface"
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# fi
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#──────────────────────────────────────────────────
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# 4. Bind gadget
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#──────────────────────────────────────────────────
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echo "$UDC" >"$G/UDC"
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log "🎉 gadget bound on $UDC (hidg0, hidg1, UAC2 L+R)"
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exit 0
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