linux-kernel - Re: [PATCH v1] i2c-hid: introduce HID over i2c specification implementation

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Date:	Mon, 15 Oct 2012 22:42:41 +0200
From:	Benjamin Tissoires <benjamin.tissoires@...il.com>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Stephane Chatty <chatty@...c.fr>, fabien.andre@...il.com,
	scott.liu@....com.tw, Ben Dooks <ben-linux@...ff.org>,
	Wolfram Sang <w.sang@...gutronix.de>,
	linux-i2c@...r.kernel.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] i2c-hid: introduce HID over i2c specification implementation

On Sun, Oct 7, 2012 at 9:03 PM, Jean Delvare <khali@...ux-fr.org> wrote:
> On Sun, 7 Oct 2012 18:57:36 +0200, Benjamin Tissoires wrote:
>> On Sun, Oct 7, 2012 at 4:28 PM, Jean Delvare <khali@...ux-fr.org> wrote:
>> > On Fri, 14 Sep 2012 15:41:43 +0200, benjamin.tissoires wrote:
>> >> +     u16 readRegister = ihid->hdesc.wDataRegister;
>> >
>> > This is missing le16_to_cpu().
>>
>> I agree this is awful, but not putting it allows me to not have to
>> check the endianness when I'm using it.
>> But I may be totally wrong on this.
>
> I'm afraid I don't follow you. I want to see:
>
>         u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
>
> If you don't do that, your driver is broken on bigendian systems. And
> there's no need to "check the endianness when you're using it", the
> above should be enough for things to work just fine.
>

a little bit late, but yes, you are entirely right. I was confused by
the fact that I only wanted to use the number coming from the device
to communicate with it, but as I made bit shifting within the CPU, I
need to convert it.
So forget my previous words here, it is fixed in v2.

Thanks
Benjamin

> --
> Jean Delvare
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