linux-kernel - RE: [PATCH v18 3/3] Input: new da7280 haptic driver

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Date:   Mon, 3 Aug 2020 01:13:43 +0000
From:   Roy Im <roy.im.opensource@...semi.com>
To:     Pavel Machek <pavel@....cz>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:     Roy Im <roy.im.opensource@...semi.com>,
        Uwe Kleine-Koenig <u.kleine-koenig@...gutronix.de>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Brian Masney <masneyb@...tation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Lee Jones <lee.jones@...aro.org>, Luca Weiss <luca@...tu.xyz>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Pascal PAILLET-LME <p.paillet@...com>,
        Rob Herring <robh@...nel.org>,
        Samuel Ortiz <sameo@...ux.intel.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Support Opensource <Support.Opensource@...semi.com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>
Subject: RE: [PATCH v18 3/3] Input: new da7280 haptic driver

On Sun, August 2, 2020 8:54 PM, Pavel Machek wrote: 
> Hi!
> 
> > > +static DEVICE_ATTR_RW(ps_seq_id);
> > > +static DEVICE_ATTR_RW(ps_seq_loop); static
> > > +DEVICE_ATTR_RW(gpi_seq_id0); static DEVICE_ATTR_RW(gpi_seq_id1);
> > > +static DEVICE_ATTR_RW(gpi_seq_id2); static
> > > +DEVICE_ATTR_WO(patterns);
> >
> > Should this be a binary attribute instead of having string parsing in
> > the kernel?
> 
> Plus... is this suitable userland interface? Should it be documetned?

It could be used by sysfs interface and string parsing, and I added some examples ahead of id and loop attributes, but for the patterns yes, it should be. As I have already added some comment before for the first comment from Dmitry, now the upload effect covers this attributes, so I would like to remove them and I have added some code a little bit more in the upload effect function in the next patch.

Thanks for your comments.

> 
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Kind regards
Roy