From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Wed, 3 Dec 2014 18:25:32 +0000 (-0700)
Subject: staging: comedi: hwdrv_apci1500: introduce z8536_read()
X-Git-Tag: fixes-v4.0-rc1~99^2~616
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=54c3ef46572015e05537526304b0d22095821a7f;p=pandora-kernel.git

staging: comedi: hwdrv_apci1500: introduce z8536_read()

The Z8536 CIO registers are indirectly read by writing the register offset to
the control register then reading the control register to get the value.

Introduce a helper function to read the Z8536 CIO registers.

The registers are read from "normal" code and in the interrupt handler,
spinlock the sequence to protect the indirect register access.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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