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Krzysztof kuhy Rudnicki
cf55091e95
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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
89 lines
2.5 KiB
Bash
Executable File
89 lines
2.5 KiB
Bash
Executable File
#!/bin/bash
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# ============================================================================
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# Logitech C270: keep a steady 30 fps in low light (udev rule)
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#
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# Disables exposure_dynamic_framerate on every plug-in/boot, so auto exposure
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# can no longer drop the camera to ~15 fps. Trade-off: a darker image in dim
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# rooms. Rationale lives in 99-c270-fixed-framerate.rules.
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#
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# fix_webcam_c270.sh install the rule and apply it now
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# fix_webcam_c270.sh --remove remove the rule (camera default returns on replug)
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# fix_webcam_c270.sh --status show rule state and the live control value
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# ============================================================================
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set -euo pipefail
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SCRIPT_NAME="$(basename "$0")"
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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readonly SCRIPT_NAME SCRIPT_DIR
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readonly RULE_NAME="99-c270-fixed-framerate.rules"
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readonly RULE_SRC="$SCRIPT_DIR/$RULE_NAME"
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readonly RULE_DST="/etc/udev/rules.d/$RULE_NAME"
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readonly CONTROL="exposure_dynamic_framerate"
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# Overridable so the tests can point it at a fake sysfs tree.
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readonly V4L_SYSFS="${C270_V4L_SYSFS:-/sys/class/video4linux}"
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log() { echo "[$SCRIPT_NAME] $*"; }
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# The C270's capture node (index 0); empty when the camera is unplugged.
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find_device() {
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local node
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for node in "$V4L_SYSFS"/video*; do
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[[ -e "$node" ]] || continue
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if [[ "$(cat "$node/index")" == 0 ]] &&
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grep -qx 0825 "$node/device/../idProduct" 2>/dev/null &&
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grep -qx 046d "$node/device/../idVendor" 2>/dev/null; then
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echo "/dev/$(basename "$node")"
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return
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fi
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done
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}
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install_rule() {
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pacman -Q v4l-utils &>/dev/null || sudo pacman -S --needed --noconfirm v4l-utils
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sudo install -m 644 "$RULE_SRC" "$RULE_DST"
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sudo udevadm control --reload
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log "installed $RULE_DST"
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local dev
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dev="$(find_device)"
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if [[ -n "$dev" ]]; then
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v4l2-ctl -d "$dev" -c "$CONTROL=0"
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log "applied to $dev now"
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else
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log "C270 not plugged in; rule applies on next plug-in"
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fi
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}
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remove_rule() {
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sudo rm -f "$RULE_DST"
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sudo udevadm control --reload
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log "removed $RULE_DST"
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}
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show_status() {
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if [[ -f "$RULE_DST" ]]; then
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log "rule: installed"
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else
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log "rule: not installed"
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fi
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local dev
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dev="$(find_device)"
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if [[ -n "$dev" ]]; then
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log "$dev: $(v4l2-ctl -d "$dev" -C "$CONTROL")"
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else
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log "C270 not plugged in"
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fi
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}
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case "${1:-}" in
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"") install_rule ;;
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--remove) remove_rule ;;
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--status) show_status ;;
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-h | --help) sed -n '4,13p' "$0" | sed 's/^# \{0,3\}//' ;;
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*)
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log "unknown option: $1"
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exit 2
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;;
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esac
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