Add automated V4L2 test workflow

.gitignore

@@ -26,3 +26,6 @@ Module.symvers
 Mkfile.old
 dkms.conf
 vcam-util
+
+# Test artifacts
+artifacts/

Makefile

@@ -17,3 +17,7 @@ kmod:
 clean:
 	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
 	$(RM) vcam-util
+
+.PHONY: test-v4l2
+test-v4l2:
+	./scripts/test-v4l2.sh

scripts/test-v4l2.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+ARTIFACT_DIR="${ROOT_DIR}/artifacts/v4l2-$(date +%Y%m%d-%H%M%S)"
+LOG="${ARTIFACT_DIR}/test.log"
+
+mkdir -p "${ARTIFACT_DIR}"
+exec > >(tee -a "${LOG}") 2>&1
+
+cd "${ROOT_DIR}"
+
+echo "== Environment =="
+uname -a
+echo
+
+echo "== Build =="
+make clean
+make
+echo
+
+echo "== Load dependencies =="
+sudo modprobe -a videobuf2_vmalloc videobuf2_v4l2 videobuf2_dma_contig
+echo
+
+echo "== Reload vcam =="
+sudo rmmod vcam 2>/dev/null || true
+sudo insmod vcam.ko
+echo
+
+echo "== Detect video device =="
+sudo ./vcam-util -l | tee "${ARTIFACT_DIR}/vcam-util-list.txt"
+VIDEO_DEV="$(sudo ./vcam-util -l |
+    awk '/\/dev\/video[0-9]+/ {print $NF; exit}')"
+
+if [[ -z "${VIDEO_DEV}" ]]; then
+    echo "ERROR: cannot find a vcam video device"
+    exit 1
+fi
+
+echo "VIDEO_DEV=${VIDEO_DEV}" | tee "${ARTIFACT_DIR}/device.env"
+echo
+
+echo "== v4l2-compliance =="
+sudo v4l2-compliance -d "${VIDEO_DEV}" -f |
+    tee "${ARTIFACT_DIR}/v4l2-compliance.txt"
+echo
+
+echo "== v4l2-ctl --all =="
+sudo v4l2-ctl -d "${VIDEO_DEV}" --all |
+    tee "${ARTIFACT_DIR}/v4l2-ctl-all.txt"
+echo
+
+echo "== v4l2-ctl --list-formats-ext =="
+sudo v4l2-ctl -d "${VIDEO_DEV}" --list-formats-ext |
+    tee "${ARTIFACT_DIR}/v4l2-formats-ext.txt"
+echo
+
+echo "== dmesg tail =="
+sudo dmesg | tail -n 100 |
+    tee "${ARTIFACT_DIR}/dmesg-tail.txt" || true
+echo
+
+echo "Artifacts saved to: ${ARTIFACT_DIR}"