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

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Message-ID: <61fa38dd-dcb6-4619-a670-a8d1d3d61046@gmail.com>
Date: Wed, 7 Jan 2026 16:20:34 +0100
From: Denis Benato <benato.denis96@...il.com>
To: Mario Limonciello <superm1@...nel.org>,
 "Ionut Nechita (Sunlight Linux)" <sunlightlinux@...il.com>,
 jikos@...nel.org, bentiss@...nel.org
Cc: 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 16:14, Mario Limonciello wrote:
> On 1/7/26 7:07 AM, Denis Benato wrote:
>>
>> 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?
>
> asus-wmi.h has conditional behavior already:
>
> #if IS_REACHABLE(CONFIG_ASUS_WMI) 
>
Ah yes I missed that.


Reviewed-by: Denis Benato <benato.denis96@...il.com>

>>> +    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
>>>   
>