On Sunday 09 November 2014 12:30:03 Pali Rohár wrote:
> On Sunday 09 November 2014 09:05:04 Dmitry Torokhov wrote:
> > Hi Pali,
> >
> > On Sun, Nov 02, 2014 at 12:25:10AM +0100, Pali Rohár wrote:
> > > int alps_detect(struct psmouse *psmouse, bool
> > > set_properties) {
> > >
> > > - struct alps_data dummy;
> > > + unsigned char e6[4];
> > >
> > > - if (alps_identify(psmouse, &dummy) < 0)
> > > - return -1;
> > > + /*
> > > + * Try "E6 report".
> > > + * ALPS should return 0,0,10 or 0,0,100 if no buttons
> > > are pressed. + * The bits 0-2 of the first byte will be
> > > 1s if some buttons are + * pressed.
> > > + */
> > > + if (alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
> > > + PSMOUSE_CMD_SETSCALE11, e6))
> > > + return -EIO;
> > > +
> > > + if ((e6[0] & 0xf8) != 0 || e6[1] != 0 || (e6[2] != 10
&&
> > > e6[2] != 100)) + return -EINVAL;
> > >
> > > if (set_properties) {
> > >
> > > + /*
> > > + * NOTE: To detect model and trackstick presence we
>
> need
>
> > > to do + * full device reset. To speed up
>
> detection
>
> > > and prevent + * calling duplicate
initialization
> > > sequence (both in + * alps_detect() and
> > > alps_init()) we set model/protocol + * version
and
> > > correct name in alps_init() (which will + * do
>
> full
>
> > > device reset). For now set name to DualPoint. + */
> > >
> > > psmouse->vendor = "ALPS";
> > >
> > > - psmouse->name = dummy.flags & ALPS_DUALPOINT ?
> > > - "DualPoint TouchPad" : "GlidePoint";
> > > - psmouse->model = dummy.proto_version << 8;
> > > + psmouse->name = "DualPoint TouchPad";
> > >
> > > }
> > >
> > > +
> > >
> > > return 0;
> >
> > We can't do this; going by e6 only will give us false
> > positives and alps_detect is supposed to be authoritative.
> >
> > Thanks.
>
> psmouse-base.c is calling alps_detect() and alps_init()
> consecutively so it does not matter if code is in _detect or
> _init function. Just need to make sure that correct order will
> be used. So this patch could not bring any problems.
>
> If psmouse-base.c detect device false-positive as ALPS (with
> alps_detect()) then it immediately calls alps_init() which
> fails and psmouse-base.c will try to use another protocol.Dmitry: PING Also see my comment for PATCH v3 3/4. -- Pali Rohár pali.ro...@gmail.com
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