linux-kernel - Re: [RFCv3 1/7] HID: Add map_msc() to avoid boilerplate code

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Date:   Wed, 8 Dec 2021 16:03:02 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Tero Kristo <tero.kristo@...ux.intel.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: [RFCv3 1/7] HID: Add map_msc() to avoid boilerplate code

On Wed, Dec 1, 2021 at 5:43 PM Tero Kristo <tero.kristo@...ux.intel.com> wrote:
>
> From: Mika Westerberg <mika.westerberg@...ux.intel.com>
>
> Since we are going to have more MSC events too, add map_msc() that can
> be used to fill in necessary fields and avoid boilerplate code.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

This one looks good to me and I should be able to take it in v5.17.

Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

Cheers,
Benjamin

> ---
>  drivers/hid/hid-input.c | 6 ++----
>  include/linux/hid.h     | 4 ++++
>  2 files changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
> index 2c72ce4147b1..39ebedb2323b 100644
> --- a/drivers/hid/hid-input.c
> +++ b/drivers/hid/hid-input.c
> @@ -52,6 +52,7 @@ static const struct {
>  #define map_rel(c)     hid_map_usage(hidinput, usage, &bit, &max, EV_REL, (c))
>  #define map_key(c)     hid_map_usage(hidinput, usage, &bit, &max, EV_KEY, (c))
>  #define map_led(c)     hid_map_usage(hidinput, usage, &bit, &max, EV_LED, (c))
> +#define map_msc(c)     hid_map_usage(hidinput, usage, &bit, &max, EV_MSC, (c))
>
>  #define map_abs_clear(c)       hid_map_usage_clear(hidinput, usage, &bit, \
>                 &max, EV_ABS, (c))
> @@ -872,10 +873,7 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
>
>                 case 0x5b: /* TransducerSerialNumber */
>                 case 0x6e: /* TransducerSerialNumber2 */
> -                       usage->type = EV_MSC;
> -                       usage->code = MSC_SERIAL;
> -                       bit = input->mscbit;
> -                       max = MSC_MAX;
> +                       map_msc(MSC_SERIAL);
>                         break;
>
>                 default:  goto unknown;
> diff --git a/include/linux/hid.h b/include/linux/hid.h
> index e95800bab56a..96eaca0d5322 100644
> --- a/include/linux/hid.h
> +++ b/include/linux/hid.h
> @@ -766,6 +766,10 @@ static inline void hid_map_usage(struct hid_input *hidinput,
>                 bmap = input->ledbit;
>                 limit = LED_MAX;
>                 break;
> +       case EV_MSC:
> +               bmap = input->mscbit;
> +               limit = MSC_MAX;
> +               break;
>         }
>
>         if (unlikely(c > limit || !bmap)) {
> --
> 2.25.1
>