diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2013-04-18 14:31:29 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-04-19 11:19:52 -0700 |
| commit | 316f97f169084c9a984d989d88ddce4eff60d749 (patch) | |
| tree | a744d6519a64966de565db77beade3599ef399aa /drivers/staging/comedi | |
| parent | 3a8d2ccdcff80c2a0aa2367cc4855c7f57e13a06 (diff) | |
staging: comedi: drivers: introduce comedi_legacy_detach()
This function is intended to be used by the comedi legacy (ISA) drivers
either directly as the (*detach) function or as a helper in the drivers
private (*detach) function.
Modify the comedi_request_region() helper so that it stores the 'len' of
the region as well as the 'start' after the region has been successfuly
allocated by request_region() in __comedi_request_region(). This region
will then be automatically released detach of the driver by the
comedi_legacy_detach() helper.
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>
Diffstat (limited to 'drivers/staging/comedi')
| -rw-r--r-- | drivers/staging/comedi/comedidev.h | 2 | ||||
| -rw-r--r-- | drivers/staging/comedi/drivers.c | 19 |
2 files changed, 20 insertions, 1 deletions
diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h index ce509d02c214..cdd472094cee 100644 --- a/drivers/staging/comedi/comedidev.h +++ b/drivers/staging/comedi/comedidev.h @@ -216,6 +216,7 @@ struct comedi_device { /* dumb */ unsigned long iobase; + unsigned long iolen; unsigned int irq; struct comedi_subdevice *read_subdev; @@ -354,6 +355,7 @@ int __comedi_request_region(struct comedi_device *, unsigned long start, unsigned long len); int comedi_request_region(struct comedi_device *, unsigned long start, unsigned long len); +void comedi_legacy_detach(struct comedi_device *); int comedi_auto_config(struct device *, struct comedi_driver *, unsigned long context); diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c index 2a28f64dc74c..6fecefeb51f1 100644 --- a/drivers/staging/comedi/drivers.c +++ b/drivers/staging/comedi/drivers.c @@ -122,6 +122,7 @@ static void cleanup_device(struct comedi_device *dev) dev->board_name = NULL; dev->board_ptr = NULL; dev->iobase = 0; + dev->iolen = 0; dev->ioenabled = false; dev->irq = 0; dev->read_subdev = NULL; @@ -387,13 +388,29 @@ int comedi_request_region(struct comedi_device *dev, int ret; ret = __comedi_request_region(dev, start, len); - if (ret == 0) + if (ret == 0) { dev->iobase = start; + dev->iolen = len; + } return ret; } EXPORT_SYMBOL_GPL(comedi_request_region); +/** + * comedi_legacy_detach() - A generic (*detach) function for legacy drivers. + * @dev: comedi_device struct + */ +void comedi_legacy_detach(struct comedi_device *dev) +{ + if (dev->iobase && dev->iolen) { + release_region(dev->iobase, dev->iolen); + dev->iobase = 0; + dev->iolen = 0; + } +} +EXPORT_SYMBOL_GPL(comedi_legacy_detach); + int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it) { struct comedi_driver *driv; |