Update RpiInfo.js

Get fan speed for Pi 5.

lib/RpiInfo.js

@@ -27,20 +27,24 @@ const os = require('os')
   * @see https://pinout.xyz
   */
 class RpiInfo extends events.EventEmitter {
+  // static get fanRpm () { return '/sys/devices/platform/cooling_fan/hwmon/hwmon2/fan1_input' }
+  static get fanPwm () { return '/sys/devices/platform/cooling_fan/hwmon/hwmon2/pwm1' }
   static get powerLed () { return '/sys/class/leds/PWR/brightness' }
   static get usbOff () { return '/sys/bus/usb/drivers/usb/unbind' }
   static get usbOn () { return '/sys/bus/usb/drivers/usb/bind' }
 
   /** Get the state of the localhost.
     * @param {boolean} noPowerLed - Don't get the state of the power LED.
+    * @param {boolean} noFan - Don't get the speed of the fan.
     * @return {object} - The state.
     */
-  async getState (noPowerLed = false) {
+  async getState (noPowerLed = false, noFan = false) {
     const now = new Date(Math.round(Date.now() / 1000) * 1000)
     return {
       date: now.toISOString(),
       boot: (new Date(now.valueOf() - os.uptime() * 1000)).toISOString(),
       powerLed: await this.getPowerLedState(noPowerLed),
+      fan: await this.getFanSpeed(noFan),
       load: Math.round(os.loadavg()[0] * 100) / 100,
       temp: RpiInfo.parseTemp(await this.vcgencmd('measure_temp')),
       freq: RpiInfo.parseFreq(await this.vcgencmd('measure_clock', 'arm')),
@@ -49,6 +53,18 @@ class RpiInfo extends events.EventEmitter {
     }
   }
 
+  /** Get the speed of the fan.
+    * @param {boolean} noFan - Don't get the speed of the fan.
+    * @return {object} - The fan speed.
+    */
+  async getFanSpeed (noFan) {
+    if (noFan) {
+      return null
+    }
+    this.emit('readFile', RpiInfo.fanPwm)
+    return parseInt(await fs.readFile(RpiInfo.fanPwm, 'utf8'))
+  }
+
   /** Get the state of the power LED.
     * @param {boolean} noPowerLed - Don't get the state of the power LED.
     * @return {string} - The state: `'0'` for off; `'255'`for on.
@@ -76,6 +92,7 @@ class RpiInfo extends events.EventEmitter {
       date: (new Date(state.date)).toISOString(),
       boot: (new Date(RpiInfo.parseBoot(state.boot))).toISOString(),
       powerLed: state.powerLed === '' ? null : parseInt(state.powerLed),
+      fan: state.fan === '' ? null : parseInt(state.fan),
       load: RpiInfo.parseLoad(state.load),
       temp: RpiInfo.parseTemp(state.temp),
       freq: RpiInfo.parseFreq(state.freq),