linux-kernel - Re: [PATCH v3] Input: uinput - add new UINPUT_DEV_SETUP and UI_ABS

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Message-ID: <CADbOyBTM0dKYik6uHAsA102hwAbhWeXM+QrFba11p+ABoMxi+w@mail.gmail.com>
Date:	Sun, 8 Nov 2015 11:55:04 +0100
From:	Elias Vanderstuyft <elias.vds@...il.com>
To:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	David Herrmann <dh.herrmann@...il.com>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	"open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] Input: uinput - add new UINPUT_DEV_SETUP and
 UI_ABS_SETUP ioctl

Hi,

On Tue, Aug 25, 2015 at 5:12 PM, Benjamin Tissoires
<benjamin.tissoires@...hat.com> wrote:
> diff --git a/include/uapi/linux/uinput.h b/include/uapi/linux/uinput.h
> index 013c9d8..ef6c9f5 100644
> --- a/include/uapi/linux/uinput.h
> +++ b/include/uapi/linux/uinput.h
> @@ -20,6 +20,11 @@
>   * Author: Aristeu Sergio Rozanski Filho <aris@...hedrallabs.org>
>   *
>   * Changes/Revisions:
> + *     0.5     08/13/2015 (David Herrmann <dh.herrmann@...il.com> &
> + *                         Benjamin Tissoires <benjamin.tissoires@...hat.com>)
> + *             - add UI_DEV_SETUP ioctl
> + *             - add UI_ABS_SETUP ioctl
> + *             - add UI_GET_VERSION ioctl
>   *     0.4     01/09/2014 (Benjamin Tissoires <benjamin.tissoires@...hat.com>)
>   *             - add UI_GET_SYSNAME ioctl
>   *     0.3     24/05/2006 (Anssi Hannula <anssi.hannulagmail.com>)
> @@ -37,8 +42,8 @@
>  #include <linux/types.h>
>  #include <linux/input.h>
>
> -#define UINPUT_VERSION         4
> -
> +#define UINPUT_VERSION         5
> +#define UINPUT_MAX_NAME_SIZE   80
>
>  struct uinput_ff_upload {
>         __u32                   request_id;
> @@ -58,6 +63,79 @@ struct uinput_ff_erase {
>  #define UI_DEV_CREATE          _IO(UINPUT_IOCTL_BASE, 1)
>  #define UI_DEV_DESTROY         _IO(UINPUT_IOCTL_BASE, 2)
>
> +struct uinput_setup {
> +       struct input_id id;
> +       char name[UINPUT_MAX_NAME_SIZE];
> +       __u32 ff_effects_max;
> +};

Is there a reason to not follow the same field order as in struct
uinput_user_dev?
I.e., why not:

struct uinput_setup {
        char name[UINPUT_MAX_NAME_SIZE];
        struct input_id id;
        __u32 ff_effects_max;
};

In case you would change this, also make sure to change the order in
the documentation of UI_DEV_SETUP.

Cheers,
Elias
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