linux-kernel - Re: [PATCH v7 1/9] HID: asus: simplify RGB init sequence

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Message-ID: 
 <CAGwozwG+gf09PQf9o9YkKFYVgVn-1w5CDVrpOe4uFavVYCNijQ@mail.gmail.com>
Date: Thu, 23 Oct 2025 20:06:34 +0200
From: Antheas Kapenekakis <lkml@...heas.dev>
To: Denis Benato <benato.denis96@...il.com>
Cc: platform-driver-x86@...r.kernel.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jiri Kosina <jikos@...nel.org>,
	Benjamin Tissoires <bentiss@...nel.org>,
 Corentin Chary <corentin.chary@...il.com>,
	"Luke D . Jones" <luke@...nes.dev>, Hans de Goede <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: Re: [PATCH v7 1/9] HID: asus: simplify RGB init sequence

On Thu, 23 Oct 2025 at 19:38, Denis Benato <benato.denis96@...il.com> wrote:
>
>
> On 10/18/25 12:17, Antheas Kapenekakis wrote:
> > Currently, RGB initialization forks depending on whether a device is
> > NKEY. Then, NKEY devices are initialized using 0x5a, 0x5d, 0x5e
> > endpoints, and non-NKEY devices with 0x5a and then a
> > backlight check, which is omitted for NKEY devices.
> >
> > Remove the fork, using a common initialization sequence for both,
> > where they are both only initialized with 0x5a, then checked for
> > backlight support. This patch should not affect existing functionality.
> >
> > 0x5d and 0x5e endpoint initializations are performed by Windows
> > userspace programs associated with different usages that reside under
> > the vendor HID. Specifically, 0x5d is used by Armoury Crate, which
> > controls RGB and 0x5e by an animation program for certain Asus laptops.
> > Neither is used currently in the driver.
> What benefits do we get from removing the unused initialization?
>
> If this has never caused any troubles I don't see the reason for removing
> them. Moreover the lighting protocol is known and I might as well add
> support for it in the near future,

I already have a patch that adds RGB and delay inits that endpoint. It
got removed to make this easier to merge. See [1].

[1] https://lore.kernel.org/lkml/20250324210151.6042-10-lkml@antheas.dev/

> > Signed-off-by: Antheas Kapenekakis <lkml@...heas.dev>
> > ---
> >  drivers/hid/hid-asus.c | 56 ++++++++++++++----------------------------
> >  1 file changed, 19 insertions(+), 37 deletions(-)
> >
> > diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
> > index a444d41e53b6..7ea1037c3979 100644
> > --- a/drivers/hid/hid-asus.c
> > +++ b/drivers/hid/hid-asus.c
> > @@ -638,50 +638,32 @@ static int asus_kbd_register_leds(struct hid_device *hdev)
> >       unsigned char kbd_func;
> >       int ret;
> >
> > -     if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD) {
> > -             /* Initialize keyboard */
> > -             ret = asus_kbd_init(hdev, FEATURE_KBD_REPORT_ID);
> > -             if (ret < 0)
> > -                     return ret;
> > -
> > -             /* The LED endpoint is initialised in two HID */
> > -             ret = asus_kbd_init(hdev, FEATURE_KBD_LED_REPORT_ID1);
> > -             if (ret < 0)
> > -                     return ret;
> > -
> > -             ret = asus_kbd_init(hdev, FEATURE_KBD_LED_REPORT_ID2);
> > -             if (ret < 0)
> > -                     return ret;
> > -
> > -             if (dmi_match(DMI_PRODUCT_FAMILY, "ProArt P16")) {
> > -                     ret = asus_kbd_disable_oobe(hdev);
> > -                     if (ret < 0)
> > -                             return ret;
> > -             }
> > -
> > -             if (drvdata->quirks & QUIRK_ROG_ALLY_XPAD) {
> > -                     intf = to_usb_interface(hdev->dev.parent);
> > -                     udev = interface_to_usbdev(intf);
> > -                     validate_mcu_fw_version(hdev,
> > -                             le16_to_cpu(udev->descriptor.idProduct));
> > -             }
> > +     ret = asus_kbd_init(hdev, FEATURE_KBD_REPORT_ID);
> > +     if (ret < 0)
> > +             return ret;
> >
> > -     } else {
> > -             /* Initialize keyboard */
> > -             ret = asus_kbd_init(hdev, FEATURE_KBD_REPORT_ID);
> > -             if (ret < 0)
> > -                     return ret;
> > +     /* Get keyboard functions */
> > +     ret = asus_kbd_get_functions(hdev, &kbd_func, FEATURE_KBD_REPORT_ID);
> > +     if (ret < 0)
> > +             return ret;
> >
> > -             /* Get keyboard functions */
> > -             ret = asus_kbd_get_functions(hdev, &kbd_func, FEATURE_KBD_REPORT_ID);
> > +     if (dmi_match(DMI_PRODUCT_FAMILY, "ProArt P16")) {
> > +             ret = asus_kbd_disable_oobe(hdev);
> >               if (ret < 0)
> >                       return ret;
> > +     }
> >
> > -             /* Check for backlight support */
> > -             if (!(kbd_func & SUPPORT_KBD_BACKLIGHT))
> > -                     return -ENODEV;
> > +     if (drvdata->quirks & QUIRK_ROG_ALLY_XPAD) {
> > +             intf = to_usb_interface(hdev->dev.parent);
> > +             udev = interface_to_usbdev(intf);
> > +             validate_mcu_fw_version(
> > +                     hdev, le16_to_cpu(udev->descriptor.idProduct));
> >       }
> >
> > +     /* Check for backlight support */
> > +     if (!(kbd_func & SUPPORT_KBD_BACKLIGHT))
> > +             return -ENODEV;
> > +
> >       drvdata->kbd_backlight = devm_kzalloc(&hdev->dev,
> >                                             sizeof(struct asus_kbd_leds),
> >                                             GFP_KERNEL);
>