linux-kernel - Re: [PATCH] power_supply: Add driver for TWL4030/TPS65950 BCI charger

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Date:	Thu, 3 Dec 2009 01:59:22 +0300
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Felipe Balbi <felipe.balbi@...ia.com>
Cc:	Grazvydas Ignotas <notasas@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Madhusudhan Chikkature <madhu.cr@...com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [PATCH] power_supply: Add driver for TWL4030/TPS65950 BCI
 charger

On Thu, Dec 03, 2009 at 12:31:56AM +0200, Felipe Balbi wrote:
> Hi,
> 
> On Wed, Dec 02, 2009 at 10:54:42PM +0100, ext Anton Vorontsov wrote:
> >As for the default USB VBUS current value, it could be Kconfig
> >option (something alike to USB_GADGET_VBUS_DRAW) and/or module
> >parameter, or hw default, or hardcoded for now. Either will
> >work.
> 
> cannot be Kconfig, it's mandated by usb battery charging spec 1.x to
> be 100mA for 100ms, then if you don't enumerate, you have to cut
> charging.

Oh, I thought TWL4030 does the USB stuff somewhat transparently
so the checks in twl4030_charger_check_vbus() would be enough.
Is there any TWL4030 reference manual available?

If TWL4030 just draws the VBUS directly, then it might be a good
idea to integrate the driver with OTG framework, as an example
see

commit 5bf2b994bfe11bfe86231050897b2d881ca544d9
Author: Philipp Zabel <philipp.zabel@...il.com>
Date:   Sun Jan 18 17:40:27 2009 +0100

    pda_power: Add optional OTG transceiver and voltage regulator support

Though, instead of just a boolean is_usb_online() stuff, you'll
have to get the allowed current draw value and configure the
charger appropriately.

Will this work?

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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