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

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Date:   Wed, 24 Aug 2016 17:04:57 -0400
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Rafał Miłecki <zajec5@...il.com>
Cc:     Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <j.anaszewski@...sung.com>,
        Felipe Balbi <balbi@...nel.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>,
        Matthias Brugger <mbrugger@...e.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Stephan Linz <linz@...pro.net>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:LED SUBSYSTEM" <linux-leds@...r.kernel.org>
Subject: Re: [PATCH V3] leds: trigger: Introduce an USB port trigger

On Wed, Aug 24, 2016 at 11:29:51AM +0200, Rafał Miłecki wrote:
> On 24 August 2016 at 11:22, Greg KH <gregkh@...uxfoundation.org> wrote:
> > On Wed, Aug 24, 2016 at 12:03:29AM +0200, Rafał Miłecki wrote:
> >> +static ssize_t ports_show(struct device *dev, struct device_attribute *attr,
> >> +                       char *buf)
> >> +{
> >> +     struct led_classdev *led_cdev = dev_get_drvdata(dev);
> >> +     struct usbport_trig_data *usbport_data = led_cdev->trigger_data;
> >> +     struct usbport_trig_port *port;
> >> +     ssize_t ret = 0;
> >> +     int len;
> >> +
> >> +     list_for_each_entry(port, &usbport_data->ports, list) {
> >> +             len = sprintf(buf + ret, "%s\n", port->name);
> >> +             if (len >= 0)
> >> +                     ret += len;
> >> +     }
> >> +
> >> +     return ret;
> >> +}
> >
> > sysfs is "one value per file", here you are listing a bunch of things in
> > one sysfs file.  Please don't do that.
> 
> OK. What do you think about creating "ports" subdirectory and creating
> file-per-port in it? Then I'd need to bring back something like
> "new_port" and "remove_port". Does it sound OK?

Maybe, I don't know.  Why is "USB" somehow unique here?  Why isn't this
the same for PCI slots/ports?  pccard?  sdcard?  thunderbolt?

thanks,

greg k-h