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staging: comedi: add comedi to usb interface helper

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Add inline helper function `comedi_to_usb_interface()` to get the
pointer to `struct usb_interface` associated with the comedi device.
This pointer is set by the call to `comedi_usb_auto_config()`.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2012-10-27 21:44:16 +01:00 • committed by Greg Kroah-Hartman
commit 0a577b823d
1 changed files with 7 additions and 2 deletions
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9
drivers/staging/comedi/comedidev.h
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@ -41,6 +41,7 @@
#include <linux/io.h>
#include <linux/timer.h>
#include <linux/pci.h>
#include <linux/usb.h>
#include "comedi.h"
@ -193,8 +194,6 @@ struct comedi_async {
unsigned int x);
};
struct usb_interface;
struct comedi_driver {
struct comedi_driver *next;
@ -457,6 +456,12 @@ static inline struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
return dev->hw_dev ? to_pci_dev(dev->hw_dev) : NULL;
}
static inline struct usb_interface *
comedi_to_usb_interface(struct comedi_device *dev)
{
return dev->hw_dev ? to_usb_interface(dev->hw_dev) : NULL;
}
int comedi_buf_put(struct comedi_async *async, short x);
int comedi_buf_get(struct comedi_async *async, short *x);