[PATCH 7/9] staging: comedi: add comedi to usb interface helper

[Ian Abbott <abbotti@xxxxxxxxx>]

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@xxxxxxxxx>
---
 drivers/staging/comedi/comedidev.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h
index 96d391a..b0a9e1a 100644
--- a/drivers/staging/comedi/comedidev.h
+++ b/drivers/staging/comedi/comedidev.h
@@ -41,6 +41,7 @@
 #include <linux/io.h>
 #include <linux/timer.h>
 #include <linux/pci.h>
+#include <linux/usb.h>
 
 #include "comedi.h"
 
@@ -185,8 +186,6 @@ 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);
 
-- 
1.7.12

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