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

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Date:   Thu, 25 Aug 2016 07:14:52 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
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 24 August 2016 at 23:04, Greg KH <gregkh@...uxfoundation.org> wrote:
> 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?

Good question. I would like to extend this USB port trigger in the
future by reacting to USB activity. This involves playing with URBs
and I believe that at that point it'd be getting too much USB specific
to /rule them all/.

-- 
Rafał