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Date: Sat, 18 Jul 2026 11:08:06 +0200
From: Greg KH <gregkh@linuxfoundation.org>
To: Metehan =?iso-8859-1?Q?G=FCnen?= <metehangnen@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
	linux-gpio@vger.kernel.org
Subject: Re: [PATCH 1/4] include/uapi/linux: add gxfp_ioctl.h for GXFP5130
 fingerprint sensor
Message-ID: <2026071855-booted-filth-ff9a@gregkh>
References: <20260718081431.25456-1-metehangnen@gmail.com>
 <20260718081431.25456-2-metehangnen@gmail.com>
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In-Reply-To: <20260718081431.25456-2-metehangnen@gmail.com>

On Sat, Jul 18, 2026 at 11:14:28AM +0300, Metehan Günen wrote:
> Define the userspace ABI for the Goodix GXFP5130 eSPI fingerprint sensor
> driver:
> 
>  - struct gxfp_tap_hdr: header prepended to every read(2) record, carries
>    payload length, MP protocol type and a ktime_get_ns() timestamp.
>  - struct gxfp_tx_pkt_hdr: header that userspace prepends to write(2)
>    payloads so the driver can wrap them in the eSPI frame format.
>  - GXFP_IOCTL_FLUSH_RXQ: flush the kernel-side RX record queue.
> 
> Signed-off-by: Metehan Günen <metehangnen@gmail.com>
> ---
>  include/uapi/linux/gxfp_ioctl.h | 43 +++++++++++++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
>  create mode 100644 include/uapi/linux/gxfp_ioctl.h
> 
> diff --git a/include/uapi/linux/gxfp_ioctl.h b/include/uapi/linux/gxfp_ioctl.h
> new file mode 100644
> index 000000000..c9c6c2d48
> --- /dev/null
> +++ b/include/uapi/linux/gxfp_ioctl.h
> @@ -0,0 +1,43 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __UAPI_GXFP_IOCTL_H
> +#define __UAPI_GXFP_IOCTL_H
> +
> +#include <linux/types.h>
> +#include <linux/ioctl.h>
> +
> +#define GXFP_IOCTL_MAGIC 'G'

Why do you get to use "G" here?