linux-kernel - Re: [PATCH 0/2] FTDI CBUS GPIO support

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Date:	Sun, 21 Jun 2015 21:44:30 +0200
From:	Stefan Agner <stefan@...er.ch>
To:	Stefan Agner <stefan@...er.ch>, johan@...nel.org,
	linus.walleij@...aro.org, gnurou@...il.com,
	grant.likely@...retlab.ca, gregkh@...uxfoundation.org,
	x-linux@...ra-silbe.de, hachti@...hti.de,
	linux-usb@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] FTDI CBUS GPIO support

On 2015-06-21 01:49, Peter Stuge wrote:
> Stefan Agner wrote:
>> libftdi requires to detach the kernel driver to get access to the device
> 
> Control transfers ought to be possible without a detach.

Good to know, thanks for this input. The detach is probably a default
behavior of libftdi... Will have a look at that.

Having kernel level gpiolib would still have advantages: It would make
the matching of the GPIO's and tty device easier, since with this patch
the gpiolib device is a sub-node of the usb-serial device in sysfs and
the user would have to use kernel interfaces only (no libftdi)...

--
Stefan
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