linux-kernel - Re: [RFC] OLPC tablet input driver, take two.

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Date:	Mon, 11 Sep 2006 15:03:39 -0400
From:	"Zephaniah E. Hull" <warp@...allh.com>
To:	Dmitry Torokhov <dtor@...ightbb.com>
Cc:	linux-input@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [RFC] OLPC tablet input driver, take two.

On Mon, Sep 11, 2006 at 03:01:35PM -0400, Dmitry Torokhov wrote:
> On 9/11/06, Zephaniah E. Hull <warp@...allh.com> wrote:
> >On Sun, Sep 10, 2006 at 06:19:31PM -0400, Dmitry Torokhov wrote:
> >> >
> >> > @@ -616,6 +617,15 @@ static int psmouse_extensions(struct psm
> >> >   */
> >> >                     max_proto = PSMOUSE_IMEX;
> >> >             }
> >> > +           ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
> >>
> >> Do we have to do 2nd reset here? Plus logic seems a bit fuzzy here -
> >> if ALPS is detected but initizliztion fails it will start OLPC detection
> >> which is probably not what you wanted...
> >
> >Reset is _probably_ not necessary, I'll verify.
> >
> >However the logic is the same as for all the others, if init succeeds,
> >it returns PSMOUSE_ALPS, if it doesn't then it continues on to the next,
> >which happens to be olpc, admittedly it would be more obvious that it's
> >doing the same thing if it was in its own if, but.
> 
> Not exactly. We have 2 types of protocols - some have only detect,
> others have both detect and init. For protocols that have both detect
> and init we expect detect to reliably identify whether the device is
> of given type or not and once detect succeeds we do not try to probe
> for other speciality protocols. For example if alps_detect succeeds
> but alps_init fails we won't try Genius detection (we will only try
> standard imex, exps and bare) and we should not try OLPC detection
> either.

Ah, I had misread the if.  Corrected in the patch that just went out.

Thank you.
Zephaniah E. Hull.
> 
> -- 
> Dmitry
> 

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