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From:   Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date:   Tue, 6 Jul 2021 10:02:36 +0200
Message-ID: <CAO-hwJJxJqgW6CGPmvL41teh6vgWfSg55qoXWL3TjQx+mvsbHg@mail.gmail.com>
Subject: Re: [PATCH 1/6] HID: hid-input: Add offhook and ring LEDs for headsets
To:     Maxim Mikityanskiy <maxtram95@gmail.com>,
        linux-leds@vger.kernel.org
Cc:     Jiri Kosina <jikos@kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Daniel Kurtz <djkurtz@chromium.org>,
        Oliver Neukum <oneukum@suse.de>,
        "open list:HID CORE LAYER" <linux-input@vger.kernel.org>,
        lkml <linux-kernel@vger.kernel.org>
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Hi Maxim,

On Sun, Jul 4, 2021 at 12:02 AM Maxim Mikityanskiy <maxtram95@gmail.com> wrote:
>
> A lot of USBHID headsets available on the market have LEDs that indicate
> ringing and off-hook states when used with VoIP applications. This
> commit exposes these LEDs via the standard sysfs interface.
>
> Signed-off-by: Maxim Mikityanskiy <maxtram95@gmail.com>
> ---
>  drivers/hid/hid-input.c                | 2 ++
>  drivers/input/input-leds.c             | 2 ++
>  include/uapi/linux/input-event-codes.h | 2 ++
>  3 files changed, 6 insertions(+)
>
> diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
> index 4286a51f7f16..44b8243f9924 100644
> --- a/drivers/hid/hid-input.c
> +++ b/drivers/hid/hid-input.c
> @@ -798,6 +798,8 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
>                 case 0x4b:  map_led (LED_MISC);     break;    /*   "Generic Indicator"        */
>                 case 0x19:  map_led (LED_MAIL);     break;    /*   "Message Waiting"          */
>                 case 0x4d:  map_led (LED_CHARGING); break;    /*   "External Power Connected" */
> +               case 0x17:  map_led (LED_OFFHOOK);  break;    /*   "Off-Hook"                 */
> +               case 0x18:  map_led (LED_RING);     break;    /*   "Ring"                     */
>
>                 default: goto ignore;
>                 }
> diff --git a/drivers/input/input-leds.c b/drivers/input/input-leds.c
> index 0b11990ade46..bc6e25b9af25 100644
> --- a/drivers/input/input-leds.c
> +++ b/drivers/input/input-leds.c
> @@ -33,6 +33,8 @@ static const struct {
>         [LED_MISC]      = { "misc" },
>         [LED_MAIL]      = { "mail" },
>         [LED_CHARGING]  = { "charging" },
> +       [LED_OFFHOOK]   = { "offhook" },

I am pretty sure this also needs to be reviewed by the led folks.
Adding them in Cc.

Cheers,
Benjamin

> +       [LED_RING]      = { "ring" },
>  };
>
>  struct input_led {
> diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h
> index 225ec87d4f22..dd785a5b5076 100644
> --- a/include/uapi/linux/input-event-codes.h
> +++ b/include/uapi/linux/input-event-codes.h
> @@ -925,6 +925,8 @@
>  #define LED_MISC               0x08
>  #define LED_MAIL               0x09
>  #define LED_CHARGING           0x0a
> +#define LED_OFFHOOK            0x0b
> +#define LED_RING               0x0c
>  #define LED_MAX                        0x0f
>  #define LED_CNT                        (LED_MAX+1)
>
> --
> 2.32.0
>