linux-kernel - Re: [PATCH] platform/x86: asus-wmi: Only Tell EC the OS will handle display hotkeys from asus_nb

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 28 May 2019 14:22:24 -0700
From:   João Paulo Rechi Vita <jprvita@...lessm.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Corentin Chary <corentin.chary@...il.com>,
        acpi4asus-user@...ts.sourceforge.net,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] platform/x86: asus-wmi: Only Tell EC the OS will handle
 display hotkeys from asus_nb_wmi

On Mon, May 20, 2019 at 11:28 PM Hans de Goede <hdegoede@...hat.com> wrote:
>
> Commit 78f3ac76d9e5 ("platform/x86: asus-wmi: Tell the EC the OS will
> handle the display off hotkey") causes the backlight to be permanently off
> on various EeePC laptop models using the eeepc-wmi driver (Asus EeePC
> 1015BX, Asus EeePC 1025C).
>
> The asus_wmi_set_devstate(ASUS_WMI_DEVID_BACKLIGHT, 2, NULL) call added
> by that commit is made conditional in this commit and only enabled in
> the quirk_entry structs in the asus-nb-wmi driver fixing the broken
> display / backlight on various EeePC laptop models.
>
> Cc: João Paulo Rechi Vita <jprvita@...lessm.com>
> Fixes: 78f3ac76d9e5 ("platform/x86: asus-wmi: Tell the EC the OS will handle the display off hotkey")
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---
>  drivers/platform/x86/asus-nb-wmi.c | 8 ++++++++
>  drivers/platform/x86/asus-wmi.c    | 2 +-
>  drivers/platform/x86/asus-wmi.h    | 1 +
>  3 files changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/platform/x86/asus-nb-wmi.c b/drivers/platform/x86/asus-nb-wmi.c
> index b6f2ff95c3ed..59f3a37a44d7 100644
> --- a/drivers/platform/x86/asus-nb-wmi.c
> +++ b/drivers/platform/x86/asus-nb-wmi.c
> @@ -78,10 +78,12 @@ static bool asus_q500a_i8042_filter(unsigned char data, unsigned char str,
>
>  static struct quirk_entry quirk_asus_unknown = {
>         .wapf = 0,
> +       .wmi_backlight_set_devstate = true,
>  };
>
>  static struct quirk_entry quirk_asus_q500a = {
>         .i8042_filter = asus_q500a_i8042_filter,
> +       .wmi_backlight_set_devstate = true,
>  };
>
>  /*
> @@ -92,26 +94,32 @@ static struct quirk_entry quirk_asus_q500a = {
>  static struct quirk_entry quirk_asus_x55u = {
>         .wapf = 4,
>         .wmi_backlight_power = true,
> +       .wmi_backlight_set_devstate = true,
>         .no_display_toggle = true,
>  };
>
>  static struct quirk_entry quirk_asus_wapf4 = {
>         .wapf = 4,
> +       .wmi_backlight_set_devstate = true,
>  };
>
>  static struct quirk_entry quirk_asus_x200ca = {
>         .wapf = 2,
> +       .wmi_backlight_set_devstate = true,
>  };
>
>  static struct quirk_entry quirk_asus_ux303ub = {
>         .wmi_backlight_native = true,
> +       .wmi_backlight_set_devstate = true,
>  };
>
>  static struct quirk_entry quirk_asus_x550lb = {
> +       .wmi_backlight_set_devstate = true,
>         .xusb2pr = 0x01D9,
>  };
>
>  static struct quirk_entry quirk_asus_forceals = {
> +       .wmi_backlight_set_devstate = true,
>         .wmi_force_als_set = true,
>  };
>
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index ee1fa93708ec..a66e99500c12 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -2131,7 +2131,7 @@ static int asus_wmi_add(struct platform_device *pdev)
>                 err = asus_wmi_backlight_init(asus);
>                 if (err && err != -ENODEV)
>                         goto fail_backlight;
> -       } else
> +       } else if (asus->driver->quirks->wmi_backlight_set_devstate)
>                 err = asus_wmi_set_devstate(ASUS_WMI_DEVID_BACKLIGHT, 2, NULL);
>
>         status = wmi_install_notify_handler(asus->driver->event_guid,
> diff --git a/drivers/platform/x86/asus-wmi.h b/drivers/platform/x86/asus-wmi.h
> index 6c1311f4b04d..57a79bddb286 100644
> --- a/drivers/platform/x86/asus-wmi.h
> +++ b/drivers/platform/x86/asus-wmi.h
> @@ -44,6 +44,7 @@ struct quirk_entry {
>         bool store_backlight_power;
>         bool wmi_backlight_power;
>         bool wmi_backlight_native;
> +       bool wmi_backlight_set_devstate;

Wouldn't it be better to add this field to struct asus_wmi_driver
instead, and set it in asus_nb_wmi_driver only? This way we wouldn't
need to make sure it is present in all quirk entries from this driver,
current and future.

I've tested both the original patch and my suggestion above and in
both cases the "turn off backlight" hotkey continued to work fine on a
machine where asus-nb-wmi is used (I don't have access to any machine
using the eeepc driver).

>         bool wmi_force_als_set;
>         int wapf;
>         /*
> --
> 2.21.0
>