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From: Jiri Kosina <jikos@kernel.org>
To: "Filipe Laíns" <lains@archlinux.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>,
	linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] HID: logitech-dj: add support for the static device in the Powerplay mat/receiver
Date: Wed, 12 Feb 2020 14:50:01 +0100 (CET)	[thread overview]
Message-ID: <nycvar.YFH.7.76.2002121449191.3144@cbobk.fhfr.pm> (raw)
In-Reply-To: <20200115201811.3271284-1-lains@archlinux.org>

On Wed, 15 Jan 2020, Filipe Laíns wrote:

> The Logitech G Powerplay has a lightspeed receiver with a static HID++
> device with ID 7 attached to it to. It is used to configure the led on
> the mat. For this reason I increased the max number of devices.
> 
> Signed-off-by: Filipe Laíns <lains@archlinux.org>
> ---
>  drivers/hid/hid-logitech-dj.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
> index bb50d6e7745b..79294b873057 100644
> --- a/drivers/hid/hid-logitech-dj.c
> +++ b/drivers/hid/hid-logitech-dj.c
> @@ -16,11 +16,11 @@
>  #include <asm/unaligned.h>
>  #include "hid-ids.h"
>  
> -#define DJ_MAX_PAIRED_DEVICES			6
> +#define DJ_MAX_PAIRED_DEVICES			7
>  #define DJ_MAX_NUMBER_NOTIFS			8
>  #define DJ_RECEIVER_INDEX			0
>  #define DJ_DEVICE_INDEX_MIN			1
> -#define DJ_DEVICE_INDEX_MAX			6
> +#define DJ_DEVICE_INDEX_MAX			7
>  
>  #define DJREPORT_SHORT_LENGTH			15
>  #define DJREPORT_LONG_LENGTH			32
> @@ -980,6 +980,11 @@ static void logi_hidpp_recv_queue_notif(struct hid_device *hdev,
>  		break;
>  	}
>  
> +	/* custom receiver device (eg. powerplay) */
> +	if (hidpp_report->device_index == 7) {
> +		workitem.reports_supported |= HIDPP;
> +	}
> +

I guess we can't do anything else than to trust Logitech that they will 
not assign conflicting device_index ID in the future to something that 
will not be HID++, right?

Or is this properly documented somewhere?

Thanks,

-- 
Jiri Kosina
SUSE Labs


  parent reply	other threads:[~2020-02-12 13:50 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-15 20:18 [PATCH] HID: logitech-dj: add support for the static device in the Powerplay mat/receiver Filipe Laíns
2020-02-08 19:07 ` Filipe Laíns
2020-02-12 13:50 ` Jiri Kosina [this message]
2020-02-12 13:56   ` Filipe Laíns
2020-03-10 13:22     ` Jiri Kosina

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