linux-kernel - Re: [PATCH 2/2] isdn: i4l: move active-isdn drivers to staging

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Message-ID: <56E324BB.1050709@imap.cc>
Date:	Fri, 11 Mar 2016 21:04:11 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	isdn@...ux-pingi.de, Paul Bolle <pebolle@...cali.nl>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Christoph Biedl <linux-kernel.bfrz@...chmal.in-ulm.de>,
	linux-arm-kernel@...ts.infradead.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, linux-doc@...r.kernel.org,
	netdev@...r.kernel.org, Jonathan Corbet <corbet@....net>,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 2/2] isdn: i4l: move active-isdn drivers to staging

Am 10.03.2016 um 17:41 schrieb isdn@...ux-pingi.de:
> Am 10.03.2016 um 13:58 schrieb Paul Bolle:
>> On do, 2016-03-10 at 11:53 +0100, isdn@...ux-pingi.de wrote:
>>> mISDN with CAPI support works just fine with pppd and pppdcapiplugin
>>> and the CAPI works for all mISDN HW.
>>
>> In the mainline tree the mISDN and CAPI stacks are effectively separate.

Correct.

> Since 2012 mISDN has a cAPI20 interface, pure in userspace.

To expand: The documented interface for CAPI 2.0 applications is the
shared library libcapi20.so. Originally that library just interfaced to
the kernel CAPI subsystem through /dev/capi20. Later it was extended to
support different access paths to ISDN devices:
- via /dev/capi20 and kernel CAPI as before
- over the network and a remote CAPI server running rcapid
- over the network to FRITZ!Box router via AVM's CAPI-over-TCP service
- last but not least, via the mISDNcapid daemon and mISDN

Of course this cuts off anything that doesn't pass through libcapi20.so,
including applications that (against the standard) access /dev/capi20
directly but also the capidrv.ko i4l compatibility shim.

-- 
Tilman Schmidt                              E-Mail: tilman@...p.cc
Bonn, Germany
Nous, on a des fleurs et des bougies pour nous protéger.



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