linux-kernel - Re: [PATCHv4 2/5] HID: hid-input: Add suffix also for HID_DG

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Message-ID: <fb99885c-a9ff-d3e7-ce72-a123cadcd9da@linux.intel.com>
Date:   Fri, 10 Dec 2021 19:51:41 +0200
From:   Tero Kristo <tero.kristo@...ux.intel.com>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Peter Hutterer <peter.hutterer@...-t.net>
Subject: Re: [PATCHv4 2/5] HID: hid-input: Add suffix also for HID_DG_PEN


On 10/12/2021 18:21, Benjamin Tissoires wrote:
>
>
> On Fri, Dec 10, 2021 at 12:12 PM Tero Kristo 
> <tero.kristo@...ux.intel.com> wrote:
>>
>> From: Mika Westerberg <mika.westerberg@...ux.intel.com>
>>
>> This and HID_DG_STYLUS are pretty much the same thing so add suffix for
>> HID_DG_PEN too. This makes the input device name look better.
>>
>> While doing this, remove the suffix override from hid-multitouch, as it
>> is now handled by hid-input. Also, the suffix override done by
>> hid-multitouch was wrong, as it mapped HID_DG_PEN => "Stylus" and
>> HID_DG_STYLUS => "Pen".
>
> FWIW, I was thinking at the following:
> ---
> diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
> index 837585f4e673..fe0da7bf24a9 100644
> --- a/drivers/hid/hid-input.c
> +++ b/drivers/hid/hid-input.c
> @@ -1775,6 +1775,15 @@ static struct hid_input 
> *hidinput_allocate(struct hid_device *hid,
>                         suffix = "Mouse";
>                         break;
>                 case HID_DG_PEN:
> +                       /*
> +                        * yes, there is an issue here:
> +                        *  DG_PEN -> "Stylus"
> +                        *  DG_STYLUS -> "Pen"
> +                        * But changing this now means users with 
> config snippets
> +                        * will have to change it and the test suite 
> will not be happy.
> +                        */
> +                       suffix = "Stylus";
> +                       break;
>                 case HID_DG_STYLUS:
>                         suffix = "Pen";
>                         break;
> ---
>
> Because the current patch breaks the test suite.

Ah I see, do you want me to re-post in this form?

-Tero

>
> Cheers,
> Benjamin
>
>>
>> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
>> Signed-off-by: Tero Kristo <tero.kristo@...ux.intel.com>
>> ---
>>  drivers/hid/hid-input.c      | 1 +
>>  drivers/hid/hid-multitouch.c | 3 ---
>>  2 files changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
>> index ad718ceb8af3..78205e445652 100644
>> --- a/drivers/hid/hid-input.c
>> +++ b/drivers/hid/hid-input.c
>> @@ -1741,6 +1741,7 @@ static struct hid_input 
>> *hidinput_allocate(struct hid_device *hid,
>>                 case HID_GD_MOUSE:
>>                         suffix = "Mouse";
>>                         break;
>> +               case HID_DG_PEN:
>>                 case HID_DG_STYLUS:
>>                         suffix = "Pen";
>>                         break;
>> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
>> index 082376a6cb3d..99eabfb4145b 100644
>> --- a/drivers/hid/hid-multitouch.c
>> +++ b/drivers/hid/hid-multitouch.c
>> @@ -1606,9 +1606,6 @@ static int mt_input_configured(struct 
>> hid_device *hdev, struct hid_input *hi)
>>         case HID_DG_STYLUS:
>>                 /* force BTN_STYLUS to allow tablet matching in udev */
>>                 __set_bit(BTN_STYLUS, hi->input->keybit);
>> -               fallthrough;
>> -       case HID_DG_PEN:
>> -               suffix = "Stylus";
>>                 break;
>>         default:
>>                 suffix = "UNKNOWN";
>> -- 
>> 2.25.1
>>
>