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

From Alan Stern <stern@rowland.harvard.edu>
Newsgroups linux.kernel
Subject Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger
Date 2016-08-25 21:40 +0200
Message-ID <sa8Fj-5fE-1@gated-at.bofh.it> (permalink)
References <sa7SV-4G3-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Thu, 25 Aug 2016, Jacek Anaszewski wrote:

> >>> What kind of description do you mean? Where should it be used / where
> >>> should it appear?
> >>>
> >>
> >> Product name/symbol. Actually it should be USB subsystem responsibility
> >> to provide the means for querying the product name by port id, if it
> >> is possible at all.
> >
> > 	cat /sys/bus/usb/devices/PORT/product
> > 	cat /sys/bus/usb/devices/PORT/manufacturer
> >
> > These will work if there is a device registered under PORT.
> 
> I've found only idProduct and idVendor files. They indeed uniquely
> identify the device, but the numbers are not human readable.
> Is there a way to retrieve the corresponding names in kernel?

If the device provides the string descriptors then the textual product
and manufacturer files are available in sysfs, otherwise they aren't.

> 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.

Alan Stern

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Thread

[PATCH V3] leds: trigger: Introduce an USB port trigger Rafał Miłecki <zajec5@gmail.com> - 2016-08-24 00:10 +0200
  Re: [PATCH V3] leds: trigger: Introduce an USB port trigger Greg KH <gregkh@linuxfoundation.org> - 2016-08-24 11:30 +0200
    Re: [PATCH V3] leds: trigger: Introduce an USB port trigger Rafał Miłecki <zajec5@gmail.com> - 2016-08-24 11:40 +0200
      Re: [PATCH V3] leds: trigger: Introduce an USB port trigger Greg KH <gregkh@linuxfoundation.org> - 2016-08-24 23:10 +0200
        Re: [PATCH V3] leds: trigger: Introduce an USB port trigger Rafał Miłecki <zajec5@gmail.com> - 2016-08-25 07:20 +0200
          Re: [PATCH V3] leds: trigger: Introduce an USB port trigger Greg KH <gregkh@linuxfoundation.org> - 2016-08-25 15:00 +0200
            Re: [PATCH V3] leds: trigger: Introduce an USB port trigger Bjørn Mork <bjorn@mork.no> - 2016-08-25 21:00 +0200
              Re: [PATCH V3] leds: trigger: Introduce an USB port trigger Greg KH <gregkh@linuxfoundation.org> - 2016-08-25 23:10 +0200
  Re: [PATCH V3] leds: trigger: Introduce an USB port trigger Greg KH <gregkh@linuxfoundation.org> - 2016-08-24 11:30 +0200
    Re: [PATCH V3] leds: trigger: Introduce an USB port trigger Rafał Miłecki <zajec5@gmail.com> - 2016-08-24 11:30 +0200
      Re: [PATCH V3] leds: trigger: Introduce an USB port trigger Greg KH <gregkh@linuxfoundation.org> - 2016-08-24 23:20 +0200
  Re: [PATCH V3] leds: trigger: Introduce an USB port trigger Rafał Miłecki <zajec5@gmail.com> - 2016-08-24 13:10 +0200
    Re: [PATCH V3] leds: trigger: Introduce an USB port trigger Matthias Brugger <mbrugger@suse.com> - 2016-08-24 14:00 +0200
  Re: [PATCH V3] leds: trigger: Introduce an USB port trigger Matthias Brugger <mbrugger@suse.com> - 2016-08-24 13:20 +0200
  [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Rafał Miłecki <zajec5@gmail.com> - 2016-08-24 20:00 +0200
    Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Bjørn Mork <bjorn@mork.no> - 2016-08-24 21:20 +0200
      Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Rafał Miłecki <zajec5@gmail.com> - 2016-08-24 22:50 +0200
    Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-08-25 10:20 +0200
      Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Matthias Brugger <mbrugger@suse.com> - 2016-08-25 10:30 +0200
      Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Rafał Miłecki <zajec5@gmail.com> - 2016-08-25 10:40 +0200
        Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-08-25 11:10 +0200
          Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Alan Stern <stern@rowland.harvard.edu> - 2016-08-25 16:50 +0200
            Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Jacek Anaszewski <jacek.anaszewski@gmail.com> - 2016-08-25 20:50 +0200
              Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Alan Stern <stern@rowland.harvard.edu> - 2016-08-25 21:40 +0200
                Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Alan Stern <stern@rowland.harvard.edu> - 2016-08-25 22:10 +0200
              Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Rafał Miłecki <zajec5@gmail.com> - 2016-08-26 18:00 +0200
                Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-08-29 10:00 +0200
                Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Pavel Machek <pavel@ucw.cz> - 2016-08-29 10:10 +0200
                Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Rafał Miłecki <zajec5@gmail.com> - 2016-08-29 10:30 +0200
                Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Pavel Machek <pavel@ucw.cz> - 2016-08-29 10:50 +0200
                Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Rafał Miłecki <zajec5@gmail.com> - 2016-08-29 11:10 +0200
              Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Pavel Machek <pavel@ucw.cz> - 2016-08-26 22:00 +0200
                Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-08-29 10:40 +0200
          Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Pavel Machek <pavel@ucw.cz> - 2016-08-26 21:50 +0200
      Re: [PATCH RFC V3.5] leds: trigger: Introduce an USB port trigger Rafał Miłecki <zajec5@gmail.com> - 2016-08-25 10:50 +0200

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