linux-kernel - Re: [PATCH v7 2/2] usb: gadget: f_fs: virtual endpoint address mapping

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Message-ID: <20140905173811.GJ24449@saruman.home>
Date:	Fri, 5 Sep 2014 12:38:11 -0500
From:	Felipe Balbi <balbi@...com>
To:	Robert Baldyga <r.baldyga@...sung.com>
CC:	<balbi@...com>, <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<mina86@...a86.com>, <m.szyprowski@...sung.com>,
	<andrzej.p@...sung.com>, <k.opasiak@...sung.com>
Subject: Re: [PATCH v7 2/2] usb: gadget: f_fs: virtual endpoint address
 mapping

On Thu, Sep 04, 2014 at 08:32:18AM +0200, Robert Baldyga wrote:
> This patch introduces virtual endpoint address mapping. It separates
> function logic form physical endpoint addresses making it more hardware
> independent.
> 
> Following modifications changes user space API, so to enable them user
> have to switch on the FUNCTIONFS_VIRTUAL_ADDR flag in descriptors.
> 
> Endpoints are now refered using virtual endpoint addresses chosen by
> user in endpoint descpriptors. This applies to each context when endpoint
> address can be used:
> - when accessing endpoint files in FunctionFS filesystemi (in file name),
> - in setup requests directed to specific endpoint (in wIndex field),
> - in descriptors returned by FUNCTIONFS_ENDPOINT_DESC ioctl.
> 
> In endpoint file names the endpoint address number is formatted as
> double-digit hexadecimal value ("ep%02x") which has few advantages -
> it is easy to parse, allows to easly recognize endpoint direction basing
> on its name (IN endpoint number starts with digit 8, and OUT with 0)
> which can be useful for debugging purpose, and it makes easier to introduce
> further features allowing to use each endpoint number in both directions
> to have more endpoints available for function if hardware supports this
> (for example we could have ep01 which is endpoint 1 with OUT direction,
> and ep81 which is endpoint 1 with IN direction).
> 
> Physical endpoint address can be still obtained using ioctl named
> FUNCTIONFS_ENDPOINT_REVMAP, but now it's not neccesary to handle
> USB transactions properly.
> 
> Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
> Acked-by: Michal Nazarewicz <mina86@...a86.com>

this one does't apply to my testing/next. Can you please rebase ?

-- 
balbi

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