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From:   Jian-Hong Pan <jian-hong@endlessm.com>
Date:   Wed, 2 May 2018 14:32:15 +0800
Message-ID: <CAPpJ_ecHKTC0=NyOfRwKuXJmRbYnD7YegHGE4Fsr-RzrUL060A@mail.gmail.com>
Subject: Re: [PATCH] platform/x86: asus-wmi: Add keyboard backlight toggle support
To:     Chris Chiu <chiu@endlessm.com>
Cc:     corentin.chary@gmail.com, dvhart@infradead.org, andy@infradead.org,
        acpi4asus-user@lists.sourceforge.net,
        platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org,
        Linux Upstreaming Team <linux@endlessm.com>
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2018-05-02 14:02 GMT+08:00 Chris Chiu <chiu@endlessm.com>:
> Some Asus laptops like UX550GE has hotkey (Fn+F7) for keyboard
> backlight toggle. In this UX550GE, the hotkey incremet the level
> of brightness for each keypress from 1 to 3, and then switch it
> off when the brightness has been the max. This commit interprets
> the code 0xc7 generated from hotkey to KEY_KBDILLUMUP to increment
> the brightness, then pass KEY_KBDILLUMTOGGLE to user space after
> the brightness max been reached for switching the led off.
>
> https://phabricator.endlessm.com/T21390
>

Tested-by: Jian-Hong Pan <jian-hong@endlessm.com>
> Signed-off-by: Chris Chiu <chiu@endlessm.com>
> ---
>  drivers/platform/x86/asus-nb-wmi.c | 1 +
>  drivers/platform/x86/asus-wmi.c    | 8 ++++++++
>  2 files changed, 9 insertions(+)
>
> diff --git a/drivers/platform/x86/asus-nb-wmi.c b/drivers/platform/x86/asus-nb-wmi.c
> index 136ff2b..14c502e 100644
> --- a/drivers/platform/x86/asus-nb-wmi.c
> +++ b/drivers/platform/x86/asus-nb-wmi.c
> @@ -496,6 +496,7 @@ static const struct key_entry asus_nb_wmi_keymap[] = {
>         { KE_KEY, 0xC4, { KEY_KBDILLUMUP } },
>         { KE_KEY, 0xC5, { KEY_KBDILLUMDOWN } },
>         { KE_IGNORE, 0xC6, },  /* Ambient Light Sensor notification */
> +       { KE_KEY, 0xC7, { KEY_KBDILLUMTOGGLE } },
>         { KE_END, 0},
>  };
>
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 1f6e68f..b64ff90 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -67,6 +67,7 @@ MODULE_LICENSE("GPL");
>  #define NOTIFY_BRNDOWN_MAX             0x2e
>  #define NOTIFY_KBD_BRTUP               0xc4
>  #define NOTIFY_KBD_BRTDWN              0xc5
> +#define NOTIFY_KBD_BRTTOGGLE           0xc7
>
>  /* WMI Methods */
>  #define ASUS_WMI_METHODID_SPEC         0x43455053 /* BIOS SPECification */
> @@ -1745,6 +1746,13 @@ static void asus_wmi_notify(u32 value, void *context)
>                 }
>         }
>
> +       if (code == NOTIFY_KBD_BRTTOGGLE) {
> +               if (asus->kbd_led_wk < asus->kbd_led.max_brightness)
> +                       code = NOTIFY_KBD_BRTUP;
> +               else
> +                       code = NOTIFY_KBD_BRTTOGGLE;
> +       }
> +
>         if (is_display_toggle(code) &&
>             asus->driver->quirks->no_display_toggle)
>                 goto exit;
> --
> 2.7.4
>