82 lines
1.7 KiB
Text
82 lines
1.7 KiB
Text
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#!/usr/bin/env bash
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#
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# Resets the specified bluetooth USB adapter.
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# Restarts bluetooth service.
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#
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# This is to work around an issue where after suspend, the bluetooth adapter is
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# not working and needed to be unplugged and re-plugged.
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#
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# This inelegant script basically automates this.
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#
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set -e
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set -u
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PS4=" $ "
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#set -x
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#
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# Values can be found using `lsusb`:
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#
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# Bus xxx Device yyy: ID VVVV:PPPP Integrated System Solution Corp. Bluetooth Device
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# ^ ^
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# ID_VENDOR-/ /
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# ID_PRODUCT-/
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#
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ID_VENDOR="${1/:*/}"
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ID_PRODUCT="${1/*:/}"
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_reset_paths() {
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for p in "$@"; do
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echo 0 > "$p"/authorized
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sleep 1
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echo 1 > "$p"/authorized
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done
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}
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#
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# Main function for the script.
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#
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main() {
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echo "Resetting USB bluetooth devices."
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# Not strictly needed, but stops bluetooth.
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# It will, in any way, be started at the end.
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systemctl stop bluetooth
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sleep 4
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# Using a function allows use of local and declare.
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local p
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local found_vnd
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local found_prd
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declare -a paths
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# For all usb devices,
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for p in /sys/bus/usb/devices/*; do
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# Try to check vendor/product IDs
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found_vnd="$(cat "$p/idVendor" 2>/dev/null)" || :
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found_prd="$(cat "$p/idProduct" 2>/dev/null)" || :
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# When both match
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if [[ "$found_vnd" == "$ID_VENDOR" && "$found_prd" == "$ID_PRODUCT" ]]; then
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# Add to valid paths
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paths+=("$p")
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fi
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done
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# Reset all paths
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_reset_paths "${paths[@]}"
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sleep 1
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# Twice for good luck
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_reset_paths "${paths[@]}"
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# Waits for everything to settle down
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sleep 2
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# Restarts bluetooth.
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systemctl restart bluetooth
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echo "Done resetting USB bluetooth devices."
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}
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# Calls up main.
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main "$@"
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