added "fan mode" command to get/set the pwm mode of a specific fan

README.md

@@ -499,6 +499,12 @@ devices that you have specified within your config.
 
 > fan2go fan --id cpu rpm
 546
+
+> fan2go fan --id cpu mode
+No control, 100% all the time (0)
+
+> fan2go fan --id cpu mode auto
+Automatic control by integrated hardware (2)
 ```
 
 ### Sensors

cmd/fan/mode.go

@@ -0,0 +1,71 @@
+package fan
+
+import (
+	"fmt"
+	"github.com/markusressel/fan2go/internal/fans"
+	"github.com/pterm/pterm"
+	"github.com/spf13/cobra"
+	"strconv"
+	"strings"
+)
+
+var modeCmd = &cobra.Command{
+	Use:   "mode",
+	Short: "Get/Set the current pwm mode setting of a fan",
+	Long:  ``,
+	Args:  cobra.RangeArgs(0, 1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		pterm.DisableOutput()
+
+		fan, err := getFan(fanId)
+		if err != nil {
+			return err
+		}
+
+		if len(args) > 0 {
+			firstArg := args[0]
+			argAsInt, err := strconv.Atoi(firstArg)
+			var pwmEnabled fans.ControlMode
+			if err != nil {
+				switch strings.ToLower(firstArg) {
+				case "auto":
+					pwmEnabled = fans.ControlModeAutomatic
+				case "pwm":
+					pwmEnabled = fans.ControlModePWM
+				case "disabled":
+					pwmEnabled = fans.ControlModeDisabled
+				default:
+					return fmt.Errorf("unknown mode: %s, must be a integer in (1..3) or one of: 'auto', 'pwm', 'disabled'", firstArg)
+				}
+			} else {
+				pwmEnabled = fans.ControlMode(argAsInt)
+			}
+			err = fan.SetPwmEnabled(pwmEnabled)
+			if err != nil {
+				return err
+			}
+		}
+
+		pwmEnabled, err := fan.GetPwmEnabled()
+		if err != nil {
+			return err
+		}
+
+		switch fans.ControlMode(pwmEnabled) {
+		case fans.ControlModeDisabled:
+			fmt.Printf("No control, 100%% all the time (%d)", pwmEnabled)
+		case fans.ControlModePWM:
+			fmt.Printf("Manual PWM control, gives fan2go control (%d)", pwmEnabled)
+		case fans.ControlModeAutomatic:
+			fmt.Printf("Automatic control by integrated hardware (%d)", pwmEnabled)
+		default:
+			fmt.Printf("Unknown (%d)", pwmEnabled)
+		}
+
+		return err
+	},
+}
+
+func init() {
+	Command.AddCommand(modeCmd)
+}