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import fs from 'fs';
import p from 'path';
/**
* class UsbLed
* usbled driver works by writing a file containing 1 (ON) or 0 (OFF) with
* the colour as the file name, the file must be written to driver path.
*
* @param {String} path: usbled driver path, if not specified then it will try
* to find driver path under /sys/bus/usb/drivers/usbled/ .
*/
class UsbLed {
constructor(path) {
this.path = path || this._find();
}
/**
* Switch on the specified colour by writing a colour file containing value 1.
*
* @param {String} colour: the colour to switch on
*/
on(colour) {
const ON = '1';
fs.writeFileSync(p.join(this.path, colour.toLowerCase()), ON);
}
/**
* Switch off the specified colour by writing a colour file containing value 0.
*
* @param {String} colour: the colour to switch off
*/
off(colour) {
const OFF = '0';
fs.writeFileSync(p.join(this.path, colour.toLowerCase()), OFF);
}
/**
* Find usbled driver path under /sys/bus/usb/drivers/usbled/.
* If there are multiple versions installed, then it will pick the largest version number.
* If there's only one version installed, that version will be used.
* If there's none or if usbled is not installed, then an error will be thrown.
*/
_find() {
const DIR = '/sys/bus/usb/drivers/usbled/';
if (!fs.existsSync(DIR)) {
throw new Error('Unable to find USB LED driver installation.');
}
let versions = fs.readdirSync(DIR).filter(function (dir) {
return dir.match(/.+:.+/);
});
if (versions.length === 0) {
throw new Error('Unable to find USB LED driver installation.');
}
if (versions.length > 1) {
versions.sort(function (v1, v2) {
return v1 < v2;
});
}
return p.join(DIR, versions[0]);
}
}
export {
UsbLed as default
};
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