linux-kernel - Re: [PATCH] HID: logitech-dj: add HIDRAW dependency in Kconfig

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Date:	Tue, 3 Dec 2013 13:51:40 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Olivier Gay <ogay@...itech.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Nestor Lopez Casado <nlopezcasad@...itech.com>,
	Mathieu Meisser <mmeisser@...itech.com>
Subject: Re: [PATCH] HID: logitech-dj: add HIDRAW dependency in Kconfig

On Tue, 3 Dec 2013, Olivier Gay wrote:

> Without hidraw driver, we get this:
> 
> <3>[  210.131988] logitech-djreceiver 0003:046D:C52B.0005: claimed by
> neither input, hiddev nor hidraw
> <3>[  210.132202] logitech-djreceiver 0003:046D:C52B.0005:
> logi_dj_probe:hid_hw_start returned error
> 
> In logi_dj_probe, we call hid_hw_start with HID_CONNECT_DEFAULT
> argument and if hidraw driver is not present, the call fails and we
> return an error in logi_dj_probe.
> 
> > It's clear that without hidraw it's not possible to change the pairing
> > from userspace, but I fail to see why probing the receiver should be
> > affected?
> 
> As of today, hid-logitech-dj.c depends on hidraw API to work. All HID
> reports sent to control / configure the receiver are sent using hidraw
> API. That's why we fail logi_dj_probe if we cannot connect to hidraw.

Hmm, so unifying receiver is not claimed by hid-input at all? 
(HID_CONNECT_DEFAULT also contains HID_CONNECT_HIDINPUT) How so?

(again, I will not be able to test it with my receiver up until the day 
after tomorrow).

Thanks,

-- 
Jiri Kosina
SUSE Labs
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