linux-kernel - Re: [PATCH 3/4] HID: asus: Add WMI communication infrastructure

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Message-ID: <088286f0-3469-4b2a-87bb-56440d40fb82@gmail.com>
Date: Wed, 7 Jan 2026 14:07:21 +0100
From: Denis Benato <benato.denis96@...il.com>
To: "Ionut Nechita (Sunlight Linux)" <sunlightlinux@...il.com>,
 jikos@...nel.org, bentiss@...nel.org
Cc: superm1@...nel.org, linux-input@...r.kernel.org,
 linux-kernel@...r.kernel.org, ionut_n2001@...oo.com
Subject: Re: [PATCH 3/4] HID: asus: Add WMI communication infrastructure


On 1/7/26 12:19, Ionut Nechita (Sunlight Linux) wrote:
> From: Ionut Nechita <ionut_n2001@...oo.com>
>
> Add the infrastructure needed for the HID driver to communicate with
> the asus-wmi driver:
>
> - Add linux/acpi.h include (in alphabetical order)
Mentioning the addition of acpi.h seems a bit too specific
for a commit message, but wait for hid maintainers to
tell.
> - Define ASUS_WMI_METHODID_NOTIF method ID in asus-wmi.h
> - Implement asus_wmi_send_event() function to send events to asus-wmi
>
> This infrastructure will be used to handle special keys that require
> WMI communication.
>
> Change-Id: Ic4d9b35f8b1f2b48c7c26e7259b4d05951021b58
> Signed-off-by: Ionut Nechita <ionut_n2001@...oo.com>
> ---
>  drivers/hid/hid-asus.c                     | 24 ++++++++++++++++++++++
>  include/linux/platform_data/x86/asus-wmi.h |  1 +
>  2 files changed, 25 insertions(+)
>
> diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
> index 06cd3d3b74af7..05fa35489258d 100644
> --- a/drivers/hid/hid-asus.c
> +++ b/drivers/hid/hid-asus.c
> @@ -23,6 +23,7 @@
>  /*
>   */
>  
> +#include <linux/acpi.h>
>  #include <linux/dmi.h>
>  #include <linux/hid.h>
>  #include <linux/module.h>
> @@ -321,6 +322,29 @@ static int asus_e1239t_event(struct asus_drvdata *drvdat, u8 *data, int size)
>  	return 0;
>  }
>  
> +/*
> + * Send events to asus-wmi driver for handling special keys
> + */
> +static int asus_wmi_send_event(struct asus_drvdata *drvdata, u8 code)
> +{
> +	int err;
> +	u32 retval;
> +
> +	err = asus_wmi_evaluate_method(ASUS_WMI_METHODID_DEVS,
> +				       ASUS_WMI_METHODID_NOTIF, code, &retval);
This code is based on the fact asus-wmi driver is available:
are you sure this doesn't make the kernel compilation fail
if such driver is not enabled?
> +	if (err) {
> +		pr_warn("Failed to notify asus-wmi: %d\n", err);
> +		return err;
> +	}
> +
> +	if (retval != 0) {
> +		pr_warn("Failed to notify asus-wmi (retval): 0x%x\n", retval);
> +		return -EIO;
> +	}
> +
> +	return 0;
> +}
> +
>  static int asus_event(struct hid_device *hdev, struct hid_field *field,
>  		      struct hid_usage *usage, __s32 value)
>  {
> diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
> index 419491d4abca1..516538b5a527e 100644
> --- a/include/linux/platform_data/x86/asus-wmi.h
> +++ b/include/linux/platform_data/x86/asus-wmi.h
> @@ -29,6 +29,7 @@
>  #define ASUS_WMI_METHODID_KBFT		0x5446424B /* KeyBoard FilTer */
>  #define ASUS_WMI_METHODID_INIT		0x54494E49 /* INITialize */
>  #define ASUS_WMI_METHODID_HKEY		0x59454B48 /* Hot KEY ?? */
> +#define ASUS_WMI_METHODID_NOTIF		0x00100021 /* Notify method */
>  
>  #define ASUS_WMI_UNSUPPORTED_METHOD	0xFFFFFFFE
>