Merge branch 'master' of /pub/scm/linux/kernel/git/torvalds/linux-2.6

   <title>Introduction</title>

  <para>

    This document describes the interfaces available for device drivers that

    drive s390 based channel attached devices. This includes interfaces for

    drive s390 based channel attached I/O devices. This includes interfaces for

    interaction with the hardware and interfaces for interacting with the

    common driver core. Those interfaces are provided by the s390 common I/O

    layer.

	The ccw bus typically contains the majority of devices available to

	a s390 system. Named after the channel command word (ccw), the basic

	command structure used to address its devices, the ccw bus contains

	so-called channel attached devices. They are addressed via subchannels,

	visible on the css bus. A device driver, however, will never interact

	with the subchannel directly, but only via the device on the ccw bus,

	so-called channel attached devices. They are addressed via I/O

	subchannels, visible on the css bus. A device driver for

	channel-attached devices, however, will never interact	with the

	subchannel directly, but only via the I/O device on the ccw bus,

	the ccw device.

  </para>

    <sect1 id="channelIO">

!Iinclude/asm-s390/ccwdev.h

!Edrivers/s390/cio/device.c

!Edrivers/s390/cio/device_ops.c

!Edrivers/s390/cio/airq.c

    </sect1>

    <sect1 id="cmf">

     <title>The channel-measurement facility</title>

   </sect1>

  </chapter>

  <chapter id="genericinterfaces">

   <title>Generic interfaces</title>

  <para>

	Some interfaces are available to other drivers that do not necessarily

	have anything to do with the busses described above, but still are

	indirectly using basic infrastructure in the common I/O layer.

	One example is the support for adapter interrupts.

  </para>

!Edrivers/s390/cio/airq.c

  </chapter>

</book>

Kernel driver pca9539

=====================

NOTE: this driver is deprecated and will be dropped soon, use

drivers/gpio/pca9539.c instead.

Supported chips:

  * Philips PCA9539

    Prefix: 'pca9539'