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| author | Ian Abbott <abbotti@mev.co.uk> | 2015-05-22 15:21:38 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-31 01:05:26 (GMT) |
| commit | 968d17786d74d2a637ab742a752e9302316f2194 (patch) | |
| tree | 761c17a5de6147b3689d7285274e44ccd397b465 /drivers/staging/comedi/Kconfig | |
| parent | dc54ba4d88c329cfadbaf3523b2f83fcc121ae49 (diff) | |
| download | linux-968d17786d74d2a637ab742a752e9302316f2194.tar.xz | |
staging: comedi: comedi_8255: new module split from 8255
The Comedi "8255" module is both a standalone Comedi device driver
module for simple devices with one or more 8255 "Programmable Peripheral
Interface" chips at known I/O base addresses (configured at run-time),
and a helper module to configure a 8255-based digital I/O subdevice for
other Comedi drivers.
Split the "8255 subdevice helper" functionality into a new module:
"comedi_8255", leaving the standalone 8255 Comedi driver in the "8255"
module.
The Comedi "detach" routine of the standalone "8255" driver needs to
retrieve the I/O base address passed to the "comedi_8255" module to set
up each subdevice in order to release the I/O port regions it requested
in its "attach" routine. The "comedi_8255" module stores it in a
"subdevice private" data structure that is no longer known to the "8255"
module, so add a new, exported function `subdev_8255_regbase()` to
retrieve it.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/comedi/Kconfig')
| -rw-r--r-- | drivers/staging/comedi/Kconfig | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig index 61c6351..7dee73d 100644 --- a/drivers/staging/comedi/Kconfig +++ b/drivers/staging/comedi/Kconfig @@ -1247,16 +1247,22 @@ config COMEDI_8254 tristate config COMEDI_8255 - tristate "Generic 8255 support" + tristate + +config COMEDI_8255_SA + tristate "Standalone 8255 support" + select COMEDI_8255 ---help--- - Enable generic 8255 support. + Enable support for 8255 digital I/O as a standalone driver. You should enable compilation this driver if you plan to use a board - that has an 8255 chip. For multifunction boards, the main driver will - configure the 8255 subdevice automatically. + that has an 8255 chip at a known I/O base address and there are no + other Comedi drivers for the board. - Note that most PCI based 8255 boards use the 8255_pci driver as a - wrapper around this driver. + Note that Comedi drivers for most multi-function boards incorporating + an 8255 chip use the 'comedi_8255' module. Most PCI-based 8255 + boards use the 8255_pci driver as a wrapper around the 'comedi_8255' + module. To compile this driver as a module, choose M here: the module will be called 8255. |