linux-kernel - Re: [PATCH v2] platform/x86: dell-laptop: fix broken kbd backlight on Inspiron 10xx

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Date:   Thu, 26 Sep 2019 10:11:46 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Pacien TRAN-GIRARD <pacien.trangirard@...ien.net>,
        Mario Limonciello <Mario.Limonciello@...l.com>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] platform/x86: dell-laptop: fix broken kbd backlight
 on Inspiron 10xx

On Wednesday 25 September 2019 18:06:40 Andy Shevchenko wrote:
> On Wed, Sep 25, 2019 at 12:48 PM Pacien TRAN-GIRARD
> <pacien.trangirard@...ien.net> wrote:
> >
> > This patch adds a quirk disabling keyboard backlight support for the
> > Dell Inspiron 1012 and 1018.
> >
> > Those models wrongly report supporting keyboard backlight control
> > features (through SMBIOS tokens) even though they're not equipped with
> > a backlit keyboard. This led to broken controls being exposed
> > through sysfs by this driver which froze the system when used.
> >
> 
> Pali, are you okay with this one?

So the real problem is that kbd backlight is not broken, but rather
laptop is without backlight keyboard? I thought that just API was broken
and keyboard backlight needs to be configured somehow else (via
dedicated buttons, etc...).

If yes, then I guess that check for quirk should be in kbd_init()
function which do detection if keyboard backlight is present or not.
And better name for quirk could be "kbd_led_not_present"...

> > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=107651
> > Signed-off-by: Pacien TRAN-GIRARD <pacien.trangirard@...ien.net>
> > ---
> >  drivers/platform/x86/dell-laptop.c | 26 ++++++++++++++++++++++++++
> >  1 file changed, 26 insertions(+)
> >
> > diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
> > index d27be2836bc2..ffe5abbdadda 100644
> > --- a/drivers/platform/x86/dell-laptop.c
> > +++ b/drivers/platform/x86/dell-laptop.c
> > @@ -33,6 +33,7 @@
> >
> >  struct quirk_entry {
> >         bool touchpad_led;
> > +       bool kbd_broken_backlight;
> >         bool kbd_led_levels_off_1;
> >         bool kbd_missing_ac_tag;
> >
> > @@ -73,6 +74,10 @@ static struct quirk_entry quirk_dell_latitude_e6410 = {
> >         .kbd_led_levels_off_1 = true,
> >  };
> >
> > +static struct quirk_entry quirk_dell_inspiron_1012 = {
> > +       .kbd_broken_backlight = true,
> > +};
> > +
> >  static struct platform_driver platform_driver = {
> >         .driver = {
> >                 .name = "dell-laptop",
> > @@ -310,6 +315,24 @@ static const struct dmi_system_id dell_quirks[] __initconst = {
> >                 },
> >                 .driver_data = &quirk_dell_latitude_e6410,
> >         },
> > +       {
> > +               .callback = dmi_matched,
> > +               .ident = "Dell Inspiron 1012",
> > +               .matches = {
> > +                       DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
> > +                       DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
> > +               },
> > +               .driver_data = &quirk_dell_inspiron_1012,
> > +       },
> > +       {
> > +               .callback = dmi_matched,
> > +               .ident = "Dell Inspiron 1018",
> > +               .matches = {
> > +                       DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
> > +                       DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1018"),
> > +               },
> > +               .driver_data = &quirk_dell_inspiron_1012,
> > +       },
> >         { }
> >  };
> >
> > @@ -2040,6 +2063,9 @@ static int __init kbd_led_init(struct device *dev)
> >  {
> >         int ret;
> >
> > +       if (quirks && quirks->kbd_broken_backlight)
> > +               return -ENODEV;
> > +
> >         kbd_init();
> >         if (!kbd_led_present)
> >                 return -ENODEV;
> > --
> > 2.19.2
> 
> 
> 

-- 
Pali Rohár
pali.rohar@...il.com