linux-kernel - Re: Problems with printk logs and my driver

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Message-ID: <CANpvso4eQ-Br8G38DXZLTpEmu=b4oLp7c+pnLDPMwAoPisgM6A@mail.gmail.com>
Date:	Wed, 14 Oct 2015 23:33:52 +0100
From:	Eric Curtin <ericcurtin17@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Austin S Hemmelgarn <ahferroin7@...il.com>,
	Jiri Kosina <jikos@...nel.org>,
	Felipe Tonello <eu@...ipetonello.com>,
	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Problems with printk logs and my driver

On 4 October 2015 at 16:28, Alan Stern <stern@...land.harvard.edu> wrote:
> On Sun, 4 Oct 2015, Eric Curtin wrote:
>
>> Ok so for the fun of it, I changed the VENDOR_ID and DEVICE_ID of my
>> keyboard to use the driver for this samsung Wireless keyboard and
>> mouse, crazy I know since I have a different piece of hardware, but I
>> wanted to see what happens or at least does it change driver. When I
>> reboot to this kernel, my keyboard still uses the usbhid driver. Why
>> does this happen?
>
> Because the Samsung wireless keyboard and mouse also use the usbhid
> driver.  Besides, the choice of driver depends just as much on the
> bInterfaceClass, -Subclass, and -Protocol as on the vendor and product
> IDs.
>
> Basically, nothing needs to use usbkbd.  Anything that driver can
> handle will also work with usbhid.  The only reason for keeping usbkbd
> as a separate driver is because it is smaller than usbhid, so it's
> better suited to some embedded applications with limited memory.
>
> Alan Stern
>

After looking at this again today, I cannot reproduce the problem anymore.
I took out the battery on this keyboard and put it back in and the issue
is now not reproducible. Pity, I was hoping to get to the bottom of this
one.

It works in X but not in console mode. I tried another one and it had the
same result, it's a more standard usb keyboard.
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