linux-kernel - Re: [PATCH v2 2/7] HID: add mapping for camera access keys

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Message-ID: <CAKdAkRQwGOf5Of7wfOHYr7D3Y0GEWtL0+0keGFXfrOic3ZiJgA@mail.gmail.com>
Date:   Tue, 27 Jun 2023 10:35:13 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Eray Orçunus <erayorcunus@...il.com>
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-input@...r.kernel.org, ike.pan@...onical.com,
        jikos@...nel.org, benjamin.tissoires@...hat.com,
        hdegoede@...hat.com, mgross@...ux.intel.com, pobrn@...tonmail.com,
        Eray Orçunus <erayorcunus@...il.com>
Subject: Re: [PATCH v2 2/7] HID: add mapping for camera access keys

Hi Eray,

On Sat, Oct 29, 2022 at 5:04 AM Eray Orçunus <erayorcunus@...il.com> wrote:
>
> HUTRR72 added 3 new usage codes for keys that are supposed to enable,
> disable and toggle camera access. These are useful, considering many
> laptops today have key(s) for toggling access to camera.
>
> This patch adds new key definitions for KEY_CAMERA_ACCESS_ENABLE,
> KEY_CAMERA_ACCESS_DISABLE and KEY_CAMERA_ACCESS_TOGGLE. Additionally
> hid-debug is adjusted to recognize this new usage codes as well.
>
> Signed-off-by: Eray Orçunus <erayorcunus@...il.com>
> Acked-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>  drivers/hid/hid-debug.c                | 3 +++
>  drivers/hid/hid-input.c                | 3 +++
>  include/uapi/linux/input-event-codes.h | 3 +++
>  3 files changed, 9 insertions(+)
>
> diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c
> index f48d3534e020..991f880fdbd4 100644
> --- a/drivers/hid/hid-debug.c
> +++ b/drivers/hid/hid-debug.c
> @@ -936,6 +936,9 @@ static const char *keys[KEY_MAX + 1] = {
>         [KEY_ASSISTANT] = "Assistant",
>         [KEY_KBD_LAYOUT_NEXT] = "KbdLayoutNext",
>         [KEY_EMOJI_PICKER] = "EmojiPicker",
> +       [KEY_CAMERA_ACCESS_ENABLE] = "CameraAccessEnable",
> +       [KEY_CAMERA_ACCESS_DISABLE] = "CameraAccessDisable",
> +       [KEY_CAMERA_ACCESS_TOGGLE] = "CameraAccessToggle",
>         [KEY_DICTATE] = "Dictate",
>         [KEY_BRIGHTNESS_MIN] = "BrightnessMin",
>         [KEY_BRIGHTNESS_MAX] = "BrightnessMax",
> diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
> index f197aed6444a..f8e6513e77b8 100644
> --- a/drivers/hid/hid-input.c
> +++ b/drivers/hid/hid-input.c
> @@ -995,6 +995,9 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
>                 case 0x0cd: map_key_clear(KEY_PLAYPAUSE);       break;
>                 case 0x0cf: map_key_clear(KEY_VOICECOMMAND);    break;
>
> +               case 0x0d5: map_key_clear(KEY_CAMERA_ACCESS_ENABLE);            break;
> +               case 0x0d6: map_key_clear(KEY_CAMERA_ACCESS_DISABLE);           break;
> +               case 0x0d7: map_key_clear(KEY_CAMERA_ACCESS_TOGGLE);            break;

I was looking at the HID Usages table spec and it came to my attention
that HUTRR72 actually established 0x76, 0x77 and 0x78 as the usages for
then new camera access controls:

https://www.usb.org/sites/default/files/hutrr72_-_usages_to_control_camera_access_0.pdf

Where did 0xd5, 0xd6 and 0xd7 came from?

It looks like we need to update the hid-input mappings as the are
clashing with game recording controls from HUTRR64:

https://www.usb.org/sites/default/files/hutrr64b_-_game_recording_controllers_0.pdf

Thanks.

-- 
Dmitry