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Date:   Wed, 5 Jun 2019 17:25:15 -0600
From:   Jeffrey Hugo <jeffrey.l.hugo@...il.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Gross <agross@...nel.org>,
        David Brown <david.brown@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        devicetree@...r.kernel.org, MSM <linux-arm-msm@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/2] HID: quirks: Refactor ELAN 400 and 401 handling

On Tue, May 21, 2019 at 10:42 AM Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> On Tue 23 Apr 09:06 PDT 2019, Jeffrey Hugo wrote:
>
> > There needs to be coordination between hid-quirks and the elan_i2c driver
> > about which devices are handled by what drivers.  Currently, both use
> > whitelists, which results in valid devices being unhandled by default,
> > when they should not be rejected by hid-quirks.  This is quickly becoming
> > an issue.
> >
> > Since elan_i2c has a maintained whitelist of what devices it will handle,
> > use that to implement a blacklist in hid-quirks so that only the devices
> > that need to be handled by elan_i2c get rejected by hid-quirks, and
> > everything else is handled by default.  The downside is the whitelist and
> > blacklist need to be kept in sync.
> >
>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
>
> Jiri, the two patches in this series doesn't have a build time
> dependency, so if you take this one through your tree I'll take 2/2
> through arm-soc.

Ping?  Is this good from the HID perspective?  I would really like to
see this queued for 5.3.

>
> Regards,
> Bjorn
>
> > Suggested-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> > Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>
> > ---
> >  drivers/hid/hid-quirks.c            | 64 ++++++++++++++++++++++++-----
> >  drivers/input/mouse/elan_i2c_core.c |  4 ++
> >  2 files changed, 58 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/hid/hid-quirks.c b/drivers/hid/hid-quirks.c
> > index 77ffba48cc73..656485e08eb7 100644
> > --- a/drivers/hid/hid-quirks.c
> > +++ b/drivers/hid/hid-quirks.c
> > @@ -987,17 +987,61 @@ bool hid_ignore(struct hid_device *hdev)
> >               break;
> >       case USB_VENDOR_ID_ELAN:
> >               /*
> > -              * Many Elan devices have a product id of 0x0401 and are handled
> > -              * by the elan_i2c input driver. But the ACPI HID ELAN0800 dev
> > -              * is not (and cannot be) handled by that driver ->
> > -              * Ignore all 0x0401 devs except for the ELAN0800 dev.
> > +              * Blacklist of everything that gets handled by the elan_i2c
> > +              * input driver.  This should be kept in sync with the whitelist
> > +              * that exists in that driver.  This avoids disabling valid
> > +              * touchpads and other ELAN devices.
> >                */
> > -             if (hdev->product == 0x0401 &&
> > -                 strncmp(hdev->name, "ELAN0800", 8) != 0)
> > -                     return true;
> > -             /* Same with product id 0x0400 */
> > -             if (hdev->product == 0x0400 &&
> > -                 strncmp(hdev->name, "QTEC0001", 8) != 0)
> > +             if ((hdev->product == 0x0401 || hdev->product == 0x0400) &&
> > +                (strncmp(hdev->name, "ELAN0000", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0100", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0600", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0601", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0602", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0603", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0604", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0605", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0606", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0607", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0608", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0609", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN060B", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN060C", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN060F", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0610", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0611", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0612", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0613", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0614", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0615", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0616", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0617", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0618", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0619", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN061A", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN061B", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN061C", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN061D", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN061E", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN061F", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0620", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0621", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0622", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0623", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0624", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0625", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0626", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0627", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0628", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0629", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN062A", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN062B", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN062C", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN062D", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0631", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN0632", 8) == 0 ||
> > +                 strncmp(hdev->name, "ELAN1000", 8) == 0 ||
> > +                 strncmp(hdev->name, "elan,ekth3000", 13) == 0))
> >                       return true;
> >               break;
> >       }
> > diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c
> > index f9525d6f0bfe..3ded19528cd4 100644
> > --- a/drivers/input/mouse/elan_i2c_core.c
> > +++ b/drivers/input/mouse/elan_i2c_core.c
> > @@ -1332,6 +1332,10 @@ static const struct i2c_device_id elan_id[] = {
> >  };
> >  MODULE_DEVICE_TABLE(i2c, elan_id);
> >
> > +/*
> > + * when these whtielists get updated, the corresponding blacklist in hid-quirks
> > + * needs to be updated to match.
> > + */
> >  #ifdef CONFIG_ACPI
> >  static const struct acpi_device_id elan_acpi_id[] = {
> >       { "ELAN0000", 0 },
> > --
> > 2.17.1
> >

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