linux-kernel - Re: RFC: btusb firmware load help

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Date:	Wed, 6 Oct 2010 19:52:06 +0200 (CEST)
From:	Sven-Haegar Koch <haegar@...net.de>
To:	"Luis R. Rodriguez" <lrodriguez@...eros.com>
cc:	Marcel Holtmann <holtmann@...ux.intel.com>,
	Luis Rodriguez <Luis.Rodriguez@...eros.com>,
	linux-bluetooth <linux-bluetooth@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	Deepak Dhamdhere <Deepak.Dhamdhere@...eros.com>,
	Sree Durbha <Sree.Durbha@...eros.com>
Subject: Re: RFC: btusb firmware load help

On Wed, 6 Oct 2010, Luis R. Rodriguez wrote:

> I just got this description from Sady:
> 
> -------------------------------------------------------------------------------------------------------------------
> With eeprom based AR3011 hardware, normally this device gets detected
> as a normal USB device with VID=0x0CF3, PID=0x3000.
> Ath3k DFU driver will download the firmware in to RAM.
> Due to firmware download in the RAM it is exposed as new device
> with VID=0x0CF3, PID=0x3002 to host Bluetooth sub system and btusb.ko
> driver probe routine gets called to bring up Bluetooth interface.
> This is the normal procedure we have done so far on Linux.
> 
> With sflash based AR3011 hardware, when we connect the device to USB
> port it gets detected as a Bluetooth device because of firmware in
> Flash (VID=0x0CF3, PID=0x3002). This triggers the Bluetooth sub
> system driver (btusb.ko) directly in the host instead of ath3k
> DFU driver. Therefore, there is no firmware downloaded in to the
> RAM to bring up Bluetooth at this point. This is the problem
> we're trying to "fix".
> -------------------------------------------------------------------------------------------------------------------
> 
> With the above patch we'd get ath3k to do the firmware uploading but
> I'm afraid that we'll go into a loop here unless we can figure out a
> way to get btusb to know the device is now ready.

Modify the firmware file so that after loading the firmware it gets for 
example VID=0x0CF3, PID=0x3003.

Blacklist VID=0x0CF3, PID=0x3002 in btusb and add it to ath3k.

>From then on VID=0x0CF3, PID=0x3000 and PID=0x3002 mean "need firmware" 
and PID=0x3003 is the operational state (like half of your PID=0x3002 
usage is now)

c'ya
sven-haegar

-- 
Three may keep a secret, if two of them are dead.
- Ben F.
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