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>
/* dumb */
unsigned long iobase;
/* dumb */
unsigned long iobase;
unsigned int irq;
struct comedi_subdevice *read_subdev;
unsigned int irq;
struct comedi_subdevice *read_subdev;
unsigned long start, unsigned long len);
int comedi_request_region(struct comedi_device *,
unsigned long start, unsigned long len);
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);
int comedi_auto_config(struct device *, struct comedi_driver *,
unsigned long context);
dev->board_name = NULL;
dev->board_ptr = NULL;
dev->iobase = 0;
dev->board_name = NULL;
dev->board_ptr = NULL;
dev->iobase = 0;
dev->ioenabled = false;
dev->irq = 0;
dev->read_subdev = NULL;
dev->ioenabled = false;
dev->irq = 0;
dev->read_subdev = NULL;
int ret;
ret = __comedi_request_region(dev, start, len);
int ret;
ret = __comedi_request_region(dev, start, len);
return ret;
}
EXPORT_SYMBOL_GPL(comedi_request_region);
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;
int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
struct comedi_driver *driv;