linux-kernel - Re: [PATCH v4] HID: i2c-hid: add polling mode based on connected GPIO chip's pin status

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Message-ID: <X9B2B6KuzbP8Is+W@kroah.com>
Date:   Wed, 9 Dec 2020 08:00:23 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Barnabás Pőcze <pobrn@...tonmail.com>
Cc:     Coiby Xu <coiby.xu@...il.com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        Helmut Stult <helmut.stult@...info.de>,
        Baq Domalaq <domalak@...il.com>,
        Pedro Ribeiro <pedrib@...il.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] HID: i2c-hid: add polling mode based on connected
 GPIO chip's pin status

On Tue, Dec 08, 2020 at 09:59:20PM +0000, Barnabás Pőcze wrote:
> 2020. november 25., szerda 16:07 keltezéssel, Greg KH írta:
> 
> > [...]
> > > +static u8 polling_mode;
> > > +module_param(polling_mode, byte, 0444);
> > > +MODULE_PARM_DESC(polling_mode, "How to poll (default=0) - 0 disabled; 1 based on GPIO pin's status");
> >
> > Module parameters are for the 1990's, they are global and horrible to
> > try to work with. You should provide something on a per-device basis,
> > as what happens if your system requires different things here for
> > different devices? You set this for all devices :(
> > [...]
> 
> Hi
> 
> do you think something like what the usbcore has would be better?
> A module parameter like "quirks=<vendor-id>:<product-id>:<flags>[,<vendor-id>:<product-id>:<flags>]*"?

Not really, that's just for debugging, and asking users to test
something, not for a final solution to anything.

thanks,

greg k-h