linux-kernel - Re: [PATCH v3] platform/x86: dell-laptop: disable kbd backlight on Inspiron 10xx

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Message-ID: <20190927215856.v3zxxcg7klijanxh@pali>
Date:   Fri, 27 Sep 2019 23:58:56 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Pacien TRAN-GIRARD <pacien.trangirard@...ien.net>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        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 v3] platform/x86: dell-laptop: disable kbd backlight on
 Inspiron 10xx

On Friday 27 September 2019 23:19:03 Pacien TRAN-GIRARD 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.
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=107651
> Signed-off-by: Pacien TRAN-GIRARD <pacien.trangirard@...ien.net>
> ---

Thank you for update! Now it is clear what is the problem
and you can add my

Reviewed-by: Pali Rohár <pali.rohar@...il.com>

>  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..74e988f839e8 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_led_not_present;
>  	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_led_not_present = 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,
> +	},
>  	{ }
>  };
>  
> @@ -1493,6 +1516,9 @@ static void kbd_init(void)
>  {
>  	int ret;
>  
> +	if (quirks && quirks->kbd_led_not_present)
> +		return;
> +
>  	ret = kbd_init_info();
>  	kbd_init_tokens();
>  

-- 
Pali Rohár
pali.rohar@...il.com