Re: [RFC/PATCH 1/2] usb: gadget: u_char: introduce chardev abstraction layer

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Hi Viral,

On Thursday 11 March 2010 05:44:35 Viral Mehta wrote:
> -----Original Message-----
> From: linux-usb-owner@xxxxxxxxxxxxxxx
> [mailto:linux-usb-owner@xxxxxxxxxxxxxxx] On Behalf Of Laurent Pinchart
> Sent: Wednesday, March 10, 2010 4:19 PM
> To: me@xxxxxxxxxxxxxxx
> Cc: Greg KH; Roger Quadros; Balbi Felipe (Nokia-D/Helsinki); Linux USB
> Mailing List; Krogerus Heikki (EXT-Teleca/Helsinki); Kaliuta Yauheni
> (Nokia-D/Helsinki); Mandy Arnaud.2 (EXT-Teleca/Helsinki); David Brownell
> Subject: Re: [RFC/PATCH 1/2] usb: gadget: u_char: introduce chardev
> abstraction layer
> 
> Hi Felipe,
> 
> On Tuesday 09 March 2010 20:34:07 me@xxxxxxxxxxxxxxx wrote:
> > On Tue, 9 Mar 2010 09:44:23 -0800, Greg KH <greg@xxxxxxxxx> wrote:
> > >> Is it good/possible to have these done in existing TTY framework?
> > > 
> > > No.  What's wrong with the gadgetfs interface for custom things such as
> > > this?  You shouldn't need a special kernel driver for it, right?
> > 
> > you do if you want to use the composite framework to build all sorts
> > of possible combinations with mtp (which is currently using u_char.c).
> > 
> > u_char.c would also help on writting a USB HID gadget driver for
> > linux or even a Video Class driver.
> > 
> > Completely out of topic, but I've written a UVC driver and posted RFC
> > patches a while ago. I'm waiting for the V4L2 events API to be
> > integrated before posting a new version.
> 
> Hi Laurent,
> I am working on the same thing, UVC code. My particular need is to roll out
> webcam gadget driver. My recent code includes,
> (Your previous code 18-sep) - (audio gadget code) + (my other changes)
> 
> I will be testing it on OMAP [2,3]430 this Monday. I was thinking to post
> V2 and CC you. But, I think I will wait now or let me know if I can help
> you in anyway.

I'm very interested to get test results on OMAP3430, especially if you can get 
double-buffer endpoints and/or high-bandwidth isochronous transfers working 
reliably.

The UVC gadget driver will depend on the V4L2 events API that is about to be 
merged in the v4l-dvb kernel tree (it should hit mainline in 2.6.35). When 
it's there I'll submit a new driver version. In the meantime I'm interested in 
hearing about the changes you've made to the driver.

-- 
Regards,

Laurent Pinchart
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