initial setup of an app to toggle acpi wakeup devices

pkg/procfs/procfs.go

@@ -0,0 +1,36 @@
+package procfs
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+const (
+	acpiWakeupDefaultPath = "/proc/acpi/wakeup"
+)
+
+type Procfs interface {
+	ACPIWakeup() (io.ReadCloser, error)
+	ACPIWakeupWrite() (io.WriteCloser, error)
+}
+
+type ProcfsDefaultPath struct{}
+
+func (p *ProcfsDefaultPath) ACPIWakeup() (io.ReadCloser, error) {
+	f, err := os.Open(acpiWakeupDefaultPath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to open %s: %w", acpiWakeupDefaultPath, err)
+	}
+
+	return f, nil
+}
+
+func (p *ProcfsDefaultPath) ACPIWakeupWrite() (io.WriteCloser, error) {
+	f, err := os.OpenFile(acpiWakeupDefaultPath, os.O_WRONLY, 0)
+	if err != nil {
+		return nil, fmt.Errorf("failed to open for writing %s: %w", acpiWakeupDefaultPath, err)
+	}
+
+	return f, nil
+}

pkg/wakeup/wakeup.go

@@ -0,0 +1,88 @@
+package wakeup
+
+import (
+	"bufio"
+	"fmt"
+	"log/slog"
+	"strings"
+
+	"code.tokarch.uk/mainnika/acpi-wakeup-fixxer/pkg/procfs"
+)
+
+const (
+	deviceHeader      = "Device"
+	columnDeviceIndex = 0
+	columnStatusIndex = 2
+	columnIndexMax    = 3
+)
+
+type Status string
+
+const StatusAll Status = ""
+const StatusEnabled Status = "*enabled"
+const StatusDisabled Status = "*disabled"
+
+type WakeupController struct {
+	ProcfsProvider procfs.Procfs
+}
+
+func NewWakeupController() *WakeupController {
+	return &WakeupController{ProcfsProvider: &procfs.ProcfsDefaultPath{}}
+}
+
+func (w *WakeupController) GetWakeupDevices(withStatus Status) ([]string, error) {
+	wakeupFile, err := w.ProcfsProvider.ACPIWakeup()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get wakeup file: %w", err)
+	}
+	defer func() { _ = wakeupFile.Close() }()
+
+	scanner := bufio.NewScanner(wakeupFile)
+	var devices []string
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		fields := strings.Fields(line)
+		if len(fields) < columnIndexMax {
+			slog.Warn("unexpected number of columns", "line", line)
+			continue
+		}
+
+		device := fields[columnDeviceIndex]
+		if device == deviceHeader {
+			continue
+		}
+
+		status := Status(fields[columnStatusIndex])
+		if withStatus != StatusAll && status != withStatus {
+			continue
+		}
+
+		devices = append(devices, device)
+	}
+	if err := scanner.Err(); err != nil {
+		return nil, fmt.Errorf("failed to scan wakeup file: %w", err)
+	}
+
+	return devices, nil
+}
+
+func (w *WakeupController) ToggleWakeupDevice(device string) error {
+	wakeupFile, err := w.ProcfsProvider.ACPIWakeupWrite()
+	if err != nil {
+		return fmt.Errorf("failed to open wakeup file for writing: %w", err)
+	}
+
+	_, err = fmt.Fprintf(wakeupFile, "%s\n", device)
+	if err != nil {
+		_ = wakeupFile.Close()
+		return fmt.Errorf("failed to write to wakeup file: %w", err)
+	}
+
+	err = wakeupFile.Close()
+	if err != nil {
+		return fmt.Errorf("failed to close wakeup file: %w", err)
+	}
+
+	return nil
+}

pkg/wakeup/wakeup_test.go

@@ -0,0 +1,105 @@
+package wakeup
+
+import (
+	"fmt"
+	"io"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type procfsMock struct{}
+
+func (p *procfsMock) ACPIWakeup() (io.ReadCloser, error) {
+	const testFileRaw = `Device	S-state	  Status   Sysfs node
+PEG0	  S3	*disabled
+EC	  S4	*disabled  platform:PNP0C09:00
+HDEF	  S3	*disabled  pci:0000:00:1b.0
+RP01	  S3	*enabled   pci:0000:00:1c.0
+RP02	  S3	*enabled   pci:0000:00:1c.1
+RP03	  S3	*enabled   pci:0000:00:1c.2
+ARPT	  S4	*enabled   pci:0000:03:00.0
+RP05	  S3	*enabled   pci:0000:00:1c.4
+RP06	  S3	*enabled   pci:0000:00:1c.5
+SPIT	  S3	*disabled  spi:spi-APP000D:00
+XHC1	  S3	*disabled  pci:0000:00:14.0
+ADP1	  S4	*disabled  platform:ACPI0003:00
+LID0	  S4	*disabled  platform:PNP0C0D:00
+`
+
+	return io.NopCloser(strings.NewReader(testFileRaw)), nil
+}
+
+func (p *procfsMock) ACPIWakeupWrite() (io.WriteCloser, error) {
+	return nil, fmt.Errorf("not implemented")
+}
+
+func TestSomething(t *testing.T) {
+
+	tt := []struct {
+		name        string
+		wantStatus  Status
+		wantDevices []string
+	}{
+		{
+			name:       "Read and parse successfully",
+			wantStatus: StatusEnabled,
+			wantDevices: []string{
+				"RP01",
+				"RP02",
+				"RP03",
+				"RP05",
+				"RP06",
+				"ARPT",
+			},
+		},
+		{
+			name:       "Read and parse disabled successfully",
+			wantStatus: StatusDisabled,
+			wantDevices: []string{
+				"PEG0",
+				"EC",
+				"HDEF",
+				"SPIT",
+				"XHC1",
+				"ADP1",
+				"LID0",
+			},
+		},
+		{
+			name:       "Read and parse all successfully",
+			wantStatus: StatusAll,
+			wantDevices: []string{
+				"RP01",
+				"RP02",
+				"RP03",
+				"RP05",
+				"RP06",
+				"ARPT",
+				"PEG0",
+				"EC",
+				"HDEF",
+				"SPIT",
+				"XHC1",
+				"ADP1",
+				"LID0",
+			},
+		},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			c := NewWakeupController()
+			c.ProcfsProvider = &procfsMock{}
+
+			devices, err := c.GetWakeupDevices(tc.wantStatus)
+			assert.NoError(t, err)
+
+			assert.Len(t, devices, len(tc.wantDevices))
+			for i, wantDevice := range tc.wantDevices {
+				assert.Contains(t, devices, wantDevice, "device %d not found", i)
+			}
+		})
+	}
+}