linux-kernel - Re: [PATCH v3 3/6] asus-wmi: Implement TUF laptop keyboard power states

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Message-ID: <CAHp75VenHd6JREvxjmcNbeshvgv-S_th9pqBBgQJ+FBgPzgWqA@mail.gmail.com>
Date:   Tue, 9 Aug 2022 10:52:21 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Luke D. Jones" <luke@...nes.dev>
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 3/6] asus-wmi: Implement TUF laptop keyboard power states

On Tue, Aug 9, 2022 at 4:51 AM Luke D. Jones <luke@...nes.dev> wrote:
>
> Adds support for setting various power states of TUF keyboards.
> These states are combinations of:
> - boot, set if a boot animation is shown on keyboard
> - awake, set if the keyboard LEDs are visible while laptop is on
> - sleep, set if an animation is displayed while the laptop is suspended
> - keyboard (unknown effect)
>
> Adds two sysfs attributes to asus-nb-wmi:
> - keyboard_rgb_state
> - keyboard_rgb_state_index

...

>                 until the keyboard_rgb_save attribute is set (write-only):
>                         * 0 - slow
>                         * 1 - medium
> -                       * 2 - fast
> \ No newline at end of file

^^^

> +                       * 2 - fast
> +
> +What:          /sys/devices/platform/<platform>/keyboard_rgb_state
> +Date:          Aug 2022
> +KernelVersion: 6.1
> +Contact:       "Luke Jones" <luke@...nes.dev>
> +Description:
> +               Set some RGB keyboard power states (write-only).
> +
> +               The accepted input is "boot awake sleep keyboard", where "n n n n n"
> +               options are:
> +                       * save - 0 or 1, if 0 then settings are not retained on boot
> +                       * boot - 0 or 1, controls if a boot animation is shown
> +                       * awake - 0 or 1, controls if the keyboard LED are on during awake
> +                       * sleep - 0 or 1, controls if a suspended animation is shown.
> +                                               This is only active if the AC is connected.
> +                       * keyboard - 0 or 1, unknown what effect this really has
> \ No newline at end of file

^^^

Be sure of not repeating the same mistake. I.e. add a newline as suggested.


> +       flags = 0;

Seems you ignored my comment here...

> +       if (sscanf(buf, "%hhd %hhd %hhd %hhd %hhd", &save, &boot, &awake, &sleep, &keyboard) != 5
> +               return -EINVAL;

> +       save = save == 0 ? 0x0100 : 0x0000;

...and here...

> +       if (boot)
> +               flags |= 0x02;
> +       if (awake)
> +               flags |= 0x08;
> +       if (sleep)
> +               flags |= 0x20;
> +       if (keyboard)
> +               flags |= 0x80;

...and here.

...

> +       err = asus_wmi_evaluate_method3(ASUS_WMI_METHODID_DEVS,
> +                       ASUS_WMI_DEVID_TUF_RGB_STATE, 0xBD | save | (flags << 16), 0, &ret);
> +       if (err)
> +               return err;

Also see another comment about how ret is supposed to be used.

-- 
With Best Regards,
Andy Shevchenko