linux-kernel - Re: [PATCH] platform/x86: asus-wmi: Add keyboard backlight toggle support

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Date:   Thu, 3 May 2018 10:40:51 +0800
From:   Chris Chiu <chiu@...lessm.com>
To:     "Puma D." <puma.d@....de>
Cc:     Corentin Chary <corentin.chary@...il.com>, dvhart@...radead.org,
        Andy Shevchenko <andy@...radead.org>,
        acpi4asus-user@...ts.sourceforge.net,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: [PATCH] platform/x86: asus-wmi: Add keyboard backlight toggle support

On Wed, May 2, 2018 at 10:29 PM, Puma D. <puma.d@....de> wrote:
> On 02.05.2018 08:02, Chris Chiu wrote:
>>
>> 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
>>
>> Signed-off-by: Chris Chiu <chiu@...lessm.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;
>> +       }
>
> Did you intend the else branch to be a noop?
>

Thanks for pointing out. The 'else' does want to do nothing special but
`Brightness Toggle` as the original code. I'll modify that and submit again.

>
>> +
>>         if (is_display_toggle(code) &&
>>             asus->driver->quirks->no_display_toggle)
>>                 goto exit;
>
>
>