freebsd: add initial support for running on FreeBSD, excluding Bluez,

ppd, and some things. Add a simple wpa_supplicant backend

core/internal/server/brightness/udev_linux.go

@@ -0,0 +1,237 @@
+package brightness
+
+import (
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/log"
+	"github.com/pilebones/go-udev/netlink"
+)
+
+const (
+	udevRecvBufSize = 8 * 1024 * 1024
+	udevMaxRetries  = 5
+	udevBaseDelay   = 2 * time.Second
+	udevMaxDelay    = 60 * time.Second
+)
+
+type UdevMonitor struct {
+	stop          chan struct{}
+	rescanMutex   sync.Mutex
+	rescanTimer   *time.Timer
+	rescanPending bool
+}
+
+func NewUdevMonitor(manager *Manager) *UdevMonitor {
+	m := &UdevMonitor{
+		stop: make(chan struct{}),
+	}
+
+	go m.run(manager)
+	return m
+}
+
+func (m *UdevMonitor) run(manager *Manager) {
+	matcher := &netlink.RuleDefinitions{
+		Rules: []netlink.RuleDefinition{
+			{Env: map[string]string{"SUBSYSTEM": "backlight"}},
+			{Env: map[string]string{"SUBSYSTEM": "drm"}},
+			{Env: map[string]string{"SUBSYSTEM": "i2c"}},
+		},
+	}
+	if err := matcher.Compile(); err != nil {
+		log.Errorf("Failed to compile udev matcher: %v", err)
+		return
+	}
+
+	failures := 0
+	for {
+		if err := m.monitorLoop(manager, matcher); err != nil {
+			log.Errorf("Udev monitor error: %v", err)
+		}
+
+		select {
+		case <-m.stop:
+			return
+		default:
+		}
+
+		failures++
+		if failures > udevMaxRetries {
+			log.Errorf("Udev monitor exceeded %d retries, giving up", udevMaxRetries)
+			return
+		}
+
+		delay := min(udevBaseDelay*time.Duration(1<<(failures-1)), udevMaxDelay)
+		log.Infof("Udev monitor reconnecting in %v (attempt %d/%d)", delay, failures, udevMaxRetries)
+
+		select {
+		case <-m.stop:
+			return
+		case <-time.After(delay):
+		}
+	}
+}
+
+func (m *UdevMonitor) monitorLoop(manager *Manager, matcher *netlink.RuleDefinitions) error {
+	conn := &netlink.UEventConn{}
+	if err := conn.Connect(netlink.UdevEvent); err != nil {
+		return err
+	}
+	defer conn.Close()
+
+	if err := syscall.SetsockoptInt(conn.Fd, syscall.SOL_SOCKET, syscall.SO_RCVBUF, udevRecvBufSize); err != nil {
+		log.Warnf("Failed to set udev socket receive buffer: %v", err)
+	}
+
+	events := make(chan netlink.UEvent)
+	errs := make(chan error)
+	conn.Monitor(events, errs, matcher)
+
+	log.Info("Udev monitor started for backlight/drm/i2c events")
+
+	for {
+		select {
+		case <-m.stop:
+			return nil
+		case err := <-errs:
+			return err
+		case event := <-events:
+			m.handleEvent(manager, event)
+		}
+	}
+}
+
+func (m *UdevMonitor) handleEvent(manager *Manager, event netlink.UEvent) {
+	subsystem := event.Env["SUBSYSTEM"]
+	devpath := event.Env["DEVPATH"]
+
+	if subsystem == "" || devpath == "" {
+		return
+	}
+
+	sysname := filepath.Base(devpath)
+	action := string(event.Action)
+
+	switch subsystem {
+	case "drm", "i2c":
+		m.handleDisplayEvent(manager, action, subsystem, sysname)
+	case "backlight":
+		m.handleBacklightEvent(manager, action, sysname)
+	}
+}
+
+func (m *UdevMonitor) handleDisplayEvent(manager *Manager, action, subsystem, sysname string) {
+	switch action {
+	case "add", "remove", "change":
+		log.Debugf("Udev %s event: %s:%s - queueing DDC rescan", action, subsystem, sysname)
+		m.debouncedRescan(manager)
+	}
+}
+
+func (m *UdevMonitor) debouncedRescan(manager *Manager) {
+	m.rescanMutex.Lock()
+	defer m.rescanMutex.Unlock()
+
+	m.rescanPending = true
+
+	if m.rescanTimer != nil {
+		m.rescanTimer.Reset(2 * time.Second)
+		return
+	}
+
+	m.rescanTimer = time.AfterFunc(2*time.Second, func() {
+		m.rescanMutex.Lock()
+		pending := m.rescanPending
+		m.rescanPending = false
+		m.rescanMutex.Unlock()
+
+		if !pending {
+			return
+		}
+
+		log.Debug("Executing debounced DDC rescan")
+		manager.Rescan()
+	})
+}
+
+func (m *UdevMonitor) handleBacklightEvent(manager *Manager, action, sysname string) {
+	switch action {
+	case "change":
+		m.handleChange(manager, "backlight", sysname)
+	case "add", "remove":
+		log.Debugf("Udev %s event: backlight:%s - triggering rescan", action, sysname)
+		manager.Rescan()
+	}
+}
+
+func (m *UdevMonitor) handleChange(manager *Manager, subsystem, sysname string) {
+	deviceID := subsystem + ":" + sysname
+
+	if manager.sysfsBackend == nil {
+		return
+	}
+
+	brightnessPath := filepath.Join(manager.sysfsBackend.basePath, subsystem, sysname, "brightness")
+	data, err := os.ReadFile(brightnessPath)
+	if err != nil {
+		log.Debugf("Udev change event for %s but failed to read brightness: %v", deviceID, err)
+		return
+	}
+
+	brightness, err := strconv.Atoi(strings.TrimSpace(string(data)))
+	if err != nil {
+		log.Debugf("Failed to parse brightness for %s: %v", deviceID, err)
+		return
+	}
+
+	manager.handleUdevBrightnessChange(deviceID, brightness)
+}
+
+func (m *UdevMonitor) Close() {
+	close(m.stop)
+}
+
+func (m *Manager) handleUdevBrightnessChange(deviceID string, rawBrightness int) {
+	if m.sysfsBackend == nil {
+		return
+	}
+
+	dev, err := m.sysfsBackend.GetDevice(deviceID)
+	if err != nil {
+		log.Debugf("Udev event for unknown device %s: %v", deviceID, err)
+		return
+	}
+
+	percent := m.sysfsBackend.ValueToPercent(rawBrightness, dev, false)
+
+	m.stateMutex.Lock()
+	var found bool
+	for i, d := range m.state.Devices {
+		if d.ID != deviceID {
+			continue
+		}
+		found = true
+		if d.Current == rawBrightness {
+			m.stateMutex.Unlock()
+			return
+		}
+		m.state.Devices[i].Current = rawBrightness
+		m.state.Devices[i].CurrentPercent = percent
+		break
+	}
+	m.stateMutex.Unlock()
+
+	if !found {
+		log.Debugf("Udev event for device not in state: %s", deviceID)
+		return
+	}
+
+	log.Debugf("Udev brightness change: %s -> %d (%d%%)", deviceID, rawBrightness, percent)
+	m.broadcastDeviceUpdate(deviceID)
+}