linux-kernel - Re: [PATCH v3 1/6] asus-wmi: Implement TUF laptop keyboard RGB control

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Message-Id: <AHBCGR.7I4U7CDRZ3J83@ljones.dev>
Date:   Tue, 09 Aug 2022 20:55:58 +1200
From:   Luke Jones <luke@...nes.dev>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Barnabás Pőcze <pobrn@...tonmail.com>,
        Pavel Machek <pavel@....cz>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/6] asus-wmi: Implement TUF laptop keyboard RGB
 control

Hi Andy,

On Tue, Aug 9 2022 at 10:46:33 +0200, Andy Shevchenko 
<andy.shevchenko@...il.com> wrote:
> On Tue, Aug 9, 2022 at 4:51 AM Luke D. Jones <luke@...nes.dev> wrote:
>> 
>>  Adds support for TUF laptop RGB control via the multicolor LED API.
>> 
>>  As this is the bas for adjusting only the RGB values, it sets the
>>  default mode of the keyboard to static since there is no way to read
>>  any existing settings from the device. These defaults overwrite the
>>  booted state of the keyboard when the module is loaded.
> 
> ...
> 
>>  +       err = asus_wmi_evaluate_method3(ASUS_WMI_METHODID_DEVS, 
>> ASUS_WMI_DEVID_TUF_RGB_MODE,
>>  +                               rgb->save | (rgb->mode << 8) | (r 
>> << 16) | (g << 24),
>>  +                               (b) | (rgb->speed << 8),
> 
> Too many parentheses.

Uh, yeah. I was unable to find concrete info on this. I at one point 
experienced an issue where the order of operations *without* 
parentheses ended up as "x | y << (8 | z) << 16". But now I'm not even 
sure if I remember that correctly. I see the order here 
https://www.cs.uic.edu/~i109/Notes/COperatorPrecedenceTable.pdf

I'll do as said and test it to be certain.

> 
>>  +                               &ret);
>>  +       if (err)
>>  +               dev_err(dev, "Unable to set TUF RGB data?\n");
>>  +
>>  +       return err;
> 
> How ret is being used?

Damn.. fixed now.

> 
> --
> With Best Regards,
> Andy Shevchenko