linux-kernel - Re: [PATCH v2] Input: elantech - fix touchpad state on resume for Lenovo N24

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Message-ID: <ZkU3CiVIABLQvvKe@google.com>
Date: Wed, 15 May 2024 15:28:26 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Jonathan Denose <jdenose@...gle.com>, jingle.wu@....com.tw,
	josh.chen@....com.tw
Cc: gregkh@...uxfoundation.org, jefferymiller@...gle.com,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	phoenix@....com.tw
Subject: Re: [PATCH v2] Input: elantech - fix touchpad state on resume for
 Lenovo N24

On Wed, May 15, 2024 at 10:29:58AM -0500, Jonathan Denose wrote:
> On Fri, May 3, 2024 at 11:12 AM Jonathan Denose <jdenose@...gle.com> wrote:
> >
> > The Lenovo N24 on resume becomes stuck in a state where it
> > sends incorrect packets, causing elantech_packet_check_v4 to fail.
> > The only way for the device to resume sending the correct packets is for
> > it to be disabled and then re-enabled.
> >
> > This change adds a dmi check to trigger this behavior on resume.
> > Signed-off-by: Jonathan Denose <jdenose@...gle.com>
> > ---
> >
> > Changes in v2:
> > - change ps2_sendbyte() calls to ps2_command()
> >
> >  drivers/input/mouse/elantech.c | 33 +++++++++++++++++++++++++++++++++
> >  1 file changed, 33 insertions(+)
> >
> > diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
> > index 4e38229404b4b..18f26315cae25 100644
> > --- a/drivers/input/mouse/elantech.c
> > +++ b/drivers/input/mouse/elantech.c
> > @@ -1476,6 +1476,23 @@ static void elantech_disconnect(struct psmouse *psmouse)
> >         psmouse->private = NULL;
> >  }
> >
> > +/*
> > + * Some hw_version 4 models fail to properly activate absolute mode on
> > + * resume without going through disable/enable cycle.
> > + */
> > +static const struct dmi_system_id elantech_needs_reenable[] = {
> > +#if defined(CONFIG_DMI) && defined(CONFIG_X86)
> > +       {
> > +               /* Lenovo N24 */
> > +               .matches = {
> > +                       DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
> > +                       DMI_MATCH(DMI_PRODUCT_NAME, "81AF"),
> > +               },
> > +       },
> > +#endif
> > +       { }
> > +};
> > +
> >  /*
> >   * Put the touchpad back into absolute mode when reconnecting
> >   */
> > @@ -1486,6 +1503,22 @@ static int elantech_reconnect(struct psmouse *psmouse)
> >         if (elantech_detect(psmouse, 0))
> >                 return -1;
> >
> > +       if (dmi_check_system(elantech_needs_reenable)) {
> > +               int err;
> > +
> > +               err = ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE);
> > +
> > +               if (err)
> > +                       psmouse_warn(psmouse, "Failed to deactivate mouse on %s: %d\n",
> > +                                       psmouse->ps2dev.serio->phys, err);
> > +
> > +               err = ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
> > +
> > +               if (err)
> > +                       psmouse_warn(psmouse, "Failed to reactivate mouse on %s: %d\n",
> > +                                       psmouse->ps2dev.serio->phys, err);
> > +       }
> > +
> >         if (elantech_set_absolute_mode(psmouse)) {
> >                 psmouse_err(psmouse,
> >                             "failed to put touchpad back into absolute mode.\n");
> > --
> > 2.45.0.rc1.225.g2a3ae87e7f-goog
> >
> 
> Hello,
> 
> Is there anything else needed from me?

Josh, Jingle, do you have any feedback on this patch?

Thanks.

-- 
Dmitry