linux-kernel - Re: [PATCH v3] i2c-hid: introduce HID over i2c specification implementation

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Date:	Fri, 16 Nov 2012 15:56:01 +0100
From:	Benjamin Tissoires <benjamin.tissoires@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>, ramalingamc@...dia.com
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Stephane Chatty <chatty@...c.fr>, fabien.andre@...il.com,
	scott.liu@....com.tw, Jean Delvare <khali@...ux-fr.org>,
	JJ Ding <jj_ding@....com.tw>, Jiri Slaby <jslaby@...e.cz>,
	Shubhrajyoti Datta <omaplinuxkernel@...il.com>,
	linux-i2c@...r.kernel.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] i2c-hid: introduce HID over i2c specification implementation

On Thu, Nov 15, 2012 at 3:04 PM, Benjamin Tissoires
<benjamin.tissoires@...il.com> wrote:
> On Thu, Nov 15, 2012 at 2:51 PM, Jiri Kosina <jkosina@...e.cz> wrote:
>> On Mon, 12 Nov 2012, Benjamin Tissoires wrote:
>>
>>> Microsoft published the protocol specification of HID over i2c:
>>> http://msdn.microsoft.com/en-us/library/windows/hardware/hh852380.aspx
>>>
>>> This patch introduces an implementation of this protocol.
>>>
>>> This implementation does not includes the ACPI part of the specification.
>>> This will come when ACPI 5.0 devices enumeration will be available.
>>>
>>> Once the ACPI part is done, OEM will not have to declare HID over I2C
>>> devices in their platform specific driver.
>>>
>>> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...il.com>
>>
>> Out of curiosity -- has this been tested on a real device (is there any
>> such device available anyway?), or is that just the implementation of the
>> defined protocol?
>
> It has been tested on an ELAN microelectronics device (a prototype),
> on an odroid-x board. That's how we figure out the bug in the
> set_report command.
> I think we manage to test all main features of the protocol
> (get_report, irqs, hid descriptor, report descriptors, set_report).
>
> I'm currently waiting for a Synaptics touchpad to check if it's also
> working with their devices.
>
> The thing is that HID over i2c for x86 platform will presumably
> require the Haswell platform from Intel (we need ACPI 5 for
> enumeration), but it would be very nice to get this in the kernel just
> before hardware arrive on the market :)
> However, I won't be surprise if android OEMs also start using this
> specification because it won't force them to write kernel drivers...

And as a complement, Ramalingam tested it for Nvidia on an early
NVIDIA's Tegra reference board for PISMO which is registered at
http://www.arm.linux.org.uk/developer/machines/list.php?id=4439 , with
a HID over i2c keyboard.
He is up to test also his Synaptics touchpad.

Cheers,
Benjamin

>
> Cheers,
> Benjamin
>
>>
>> Thanks,
>>
>> --
>> Jiri Kosina
>> SUSE Labs
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