46 lines
2 KiB
Bash
46 lines
2 KiB
Bash
#!/vendor/bin/sh
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#
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# wireless_reprobe.sh - re-probe wireless drivers once /vendor is mounted.
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#
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# Built-in wireless drivers probe during early kernel init, before /vendor
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# (which holds all firmware; see the kernel's patched fw_path[]) is mounted.
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# Their firmware requests fail fast with ENOENT and the kernel never retries,
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# leaving the hardware driverless or degraded. Run from init at post-fs
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# (i.e. after /vendor is mounted) via init.tart.wifi.rc, this script:
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#
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# 1. Re-probes every driverless USB interface, so a USB WiFi adapter that
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# was plugged in at power-on (and whose driver probe failed on the
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# missing firmware) gets a second probe that can now load firmware.
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# 2. Rebinds the Broadcom Bluetooth serdev device, so hci_bcm reloads its
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# .hcd patch firmware (e.g. brcm/SYN43711A0.hcd). Without the patch the
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# controller runs with unpatched defaults, which cripples TX power/range.
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#
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# Both operations are idempotent and safe: already-bound USB interfaces are
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# skipped, and the BT rebind simply re-registers hci0 before the Bluetooth
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# stack starts.
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# 1. USB: ask the kernel to re-run driver matching for unbound interfaces
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# (directories like 1-1:1.0 without a "driver" symlink). Two passes with a
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# delay: a probe that was already in flight (started just before /vendor
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# finished mounting) can still fail after the first pass runs; the second
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# pass catches the interface it leaves behind.
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reprobe_usb() {
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for intf in /sys/bus/usb/devices/*:*; do
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[ -e "$intf/driver" ] && continue
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echo "${intf##*/}" > /sys/bus/usb/drivers_probe 2>/dev/null
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done
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}
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reprobe_usb
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sleep 3
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reprobe_usb
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# 2. Bluetooth: unbind + re-probe serdev devices so the hci_bcm driver's
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# firmware patch request runs again with /vendor/firmware available.
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for dev in /sys/bus/serial/devices/*; do
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[ -e "$dev/driver" ] || continue
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name="${dev##*/}"
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echo "$name" > "$dev/driver/unbind" 2>/dev/null
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echo "$name" > /sys/bus/serial/drivers_probe 2>/dev/null
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done
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exit 0
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