linux-kernel - Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger

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Message-ID: <Pine.LNX.4.44L0.1608251601090.1395-100000@iolanthe.rowland.org>
Date:   Thu, 25 Aug 2016 16:08:14 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
cc:     Jacek Anaszewski <j.anaszewski@...sung.com>,
        Rafał Miłecki <zajec5@...il.com>,
        Richard Purdie <rpurdie@...ys.net>,
        Felipe Balbi <balbi@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Peter Chen <hzpeterchen@...il.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Jonathan Corbet <corbet@....net>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Stephan Linz <linz@...pro.net>,
        Matthias Brugger <mbrugger@...e.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:LED SUBSYSTEM" <linux-leds@...r.kernel.org>,
        Pavel Machek <pavel@....cz>
Subject: Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger

On Thu, 25 Aug 2016, Alan Stern wrote:

> > Does the lsusb command do the mapping in the user space or maybe
> > it takes the names from kernel?
> 
> lsusb does the mapping in userspace, based on an ID database.  On my 
> system (Fedora), the database is /etc/udev/hwdb.bin.

There's also /usr/share/hwdata/usb.ids -- I don't know if or how the
two databases are related.  And there's /usr/lib/udev/hwdb.d/20-usb*.

Alan Stern