linux-kernel - Re: [PATCH v7] Bluetooth: btwilink driver

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Message-ID: <AANLkTimewUbJMax-pv+-JSdnbNZvOU8yTVGV-T+BJBo1@mail.gmail.com>
Date:	Thu, 9 Dec 2010 13:17:32 +0530
From:	Pavan Savoy <pavan_savoy@...y.com>
To:	Vitaly Wool <vitalywool@...il.com>,
	"Gustavo F. Padovan" <padovan@...fusion.mobi>
Cc:	marcel@...tmann.org, linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7] Bluetooth: btwilink driver

Gustavo,

On Tue, Dec 7, 2010 at 3:05 AM, Vitaly Wool <vitalywool@...il.com> wrote:
> Hi Gustavo,
>
> On Mon, Dec 6, 2010 at 10:23 PM, Gustavo F. Padovan
> <padovan@...fusion.mobi> wrote:
>
>> Can't you differentiate Bluetooth data in a generic way, withou looking if it
>> is ACL, SCO or HCI EVENT? That done, you can just accumulate in a buffer all
>> the Bluetooth data you received in that stream then send it to Bluetooth
>> driver after finish that stream processing.
>
> I'm afraid he can't do this because he needs to route events to the
> appropriate entity (BT/FM/GPS). I'm not sure how it can be done
> without analyzing the incoming packet.

Think of TI-ST driver as a extension to the HCI-H4 driver or HCI-LL
with FM and GPS being the additional protocols, and more protocols
coming in future...
So some driver has to have a knowledge of the protocols which are on chip.
the basic arch can be found @ http://omappedia.org/wiki/Wilink_ST

As Vitaly rightly pointed out, the TI-ST driver needs to peek into all
the protocol's data be it BT, FM or GPS to assemble fragmented data
(say ACL data coming out of TTY in 2 fragments) or fragment multiple
protocol data (say HCI-Event + FM Channel 8 event data)....
Note: we include even the FM and GPS headers to understand protocol
frames, but they lack a standard unlike Bluetooth...

Since there lacks a generic way to differentiate BT, FM or GPS data at
TI-ST driver layer,  please suggest what can be done ...

> Thanks,
>   Vitaly
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